U.S. patent application number 11/136736 was filed with the patent office on 2005-12-29 for pedestal unit, raised floor skeleton structure, method of installing pedestal unit, and method of producing pedestal frame.
This patent application is currently assigned to NIPPON LIGHT METAL COMPANY, LTD.. Invention is credited to Ando, Shinji, Hagisawa, Nobuyasu, Hashimoto, Yakobu, Hidaka, Hirotoshi, Hiramatsu, Kazutsugu, Kaji, Hideyuki, Kobayashi, Shyouji, Kuramasu, Yukio, Nishiyama, Toshimasa, Ono, Takeshi, Oshima, Yukiji, Saito, Shigenori, Sato, Hiromichi, Tanaka, Kiyofumi, Yamashita, Takenori.
Application Number | 20050284040 11/136736 |
Document ID | / |
Family ID | 35503986 |
Filed Date | 2005-12-29 |
United States Patent
Application |
20050284040 |
Kind Code |
A1 |
Hashimoto, Yakobu ; et
al. |
December 29, 2005 |
Pedestal unit, raised floor skeleton structure, method of
installing pedestal unit, and method of producing pedestal
frame
Abstract
A pedestal unit usable for a raised floor is disclosed which
comprises: a pair of beams; and a pair of pedestal frames for
supporting the beams at both ends of the beams, respectively. Each
pedestal frame comprises: a pair of leg members; a pair of base
plates for supporting the leg members; respectively, and a
connecting member with a predetermined length for rigidly
connecting the legs member each other with a predetermined
interval. The pedestal frame may be installed under a middle
portion of the beams, which frame may be installed after
installation of pedestal frames at ends of beams for easy
adjustment. Additional pedestal frames for supporting additional
beams may be fixed to the pedestal frames or the beam. A supporting
surface of leg member may have a mount provided by casting and be
cut for accurate dimensions.
Inventors: |
Hashimoto, Yakobu; (Tokyo,
JP) ; Hiramatsu, Kazutsugu; (Tokyo, JP) ;
Yamashita, Takenori; (Tokyo, JP) ; Sato,
Hiromichi; (Tokyo, JP) ; Kobayashi, Shyouji;
(Tokyo, JP) ; Hidaka, Hirotoshi; (Tokyo, JP)
; Ando, Shinji; (Tokyo, JP) ; Oshima, Yukiji;
(Tokyo, JP) ; Kaji, Hideyuki; (Tokyo, JP) ;
Ono, Takeshi; (Chiba, JP) ; Saito, Shigenori;
(Tokyo, JP) ; Tanaka, Kiyofumi; (Shizuoka, JP)
; Nishiyama, Toshimasa; (Niigata, JP) ; Kuramasu,
Yukio; (Shizuoka, JP) ; Hagisawa, Nobuyasu;
(Shizuoka, JP) |
Correspondence
Address: |
SQUIRE, SANDERS & DEMPSEY L.L.P.
14TH FLOOR
8000 TOWERS CRESCENT
TYSONS CORNER
VA
22182
US
|
Assignee: |
NIPPON LIGHT METAL COMPANY,
LTD.
NTT FACILITIES, INC.
|
Family ID: |
35503986 |
Appl. No.: |
11/136736 |
Filed: |
May 25, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60576407 |
Jun 3, 2004 |
|
|
|
Current U.S.
Class: |
52/126.1 |
Current CPC
Class: |
E04F 15/0247 20130101;
E04F 2015/02061 20130101; E04F 15/02458 20130101 |
Class at
Publication: |
052/126.1 |
International
Class: |
E04B 002/82 |
Claims
The invention claimed is:
1. A pedestal unit usable for a raised floor, comprising: a pair of
beams; and a pair of pedestal frames for supporting both ends of
the beams, respectively, wherein each pedestal frame comprises: a
pair of leg members; a pair of base plates for supporting the leg
members, respectively; and a connecting member with a predetermined
length for rigidly connecting the leg members each other.
2. The pedestal unit as claimed in claim 1, further comprising an
intermediate pedestal frame that is arranged between a pair of the
pedestal frames for supporting the beams, wherein the intermediate
pedestal frame comprises: a pair of leg members; a pair of base
plates for supporting the leg members of the intermediate pedestal
frame, respectively; and a connecting member for rigidly connecting
the leg members of the intermediate pedestal frame each other with
a predetermined distance.
3. The pedestal unit as claimed in claim 2, further comprising: an
additional beam arranged on at a side of a pair of the beams; a
plurality of additional pedestal frames for supporting the
additional beam, wherein each of the additional pedestal frames
comprises: an additional leg member; an additional base plate for
supporting the additional leg member; and an extending member
extending from the additional leg member with a predetermined span
to the beam arranged at the side of the additional pedestal frames,
the additional leg member being rigidly connected through the
extending member at a tip of the extending member to at least one
of the pedestal frames and the beam that is arranged at the side of
said additional pedestal frame.
4. The pedestal unit as claimed in claim 1, further comprising: an
additional beam arranged at a side of a pair of the beams; a
plurality of additional pedestal frames for supporting the
additional beam, wherein each of the additional pedestal frames
comprises: an additional leg member; an additional base plate for
supporting the additional leg member; and an extending member
extending from the additional leg member with a predetermined span
to the beam arranged at the side of the additional pedestal frames,
a tip of the extending member being connected to at least one of
the pedestal frames and the beam that is arranged at the side of
said additional pedestal frame.
5. A raised floor skeleton structure for supporting a raised floor,
comprising: a plurality of pedestal units each comprising: a pair
of beams; and a pedestal frame for supporting the beams at one ends
of the beams, wherein each pedestal frame comprises: a pair of leg
members; a pair of base plates for supporting the leg members;
respectively, and a connecting member with a predetermined length
for rigidly connecting the legs member to each other, wherein a
plurality of the pedestal units are sequentially connected in a
longitudinal direction of the beams, wherein one ends of the beams
of a one of pedestal units confronts the other ends of the beams of
another one of pedestal units neighboring the one of the pedestal
units, and wherein the pedestal frame of the one of pedestal unit
comprises first regions for supporting the one ends of the beams of
the one of the pedestal unit and second regions for supporting the
other ends of the beams of the another one of the pedestal
unit.
6. The raised floor skeleton structure as claimed in claim 5,
wherein at least one of the pedestal units further comprises: an
intermediate pedestal frame that is arranged between a pair of the
pedestal frames of at least one of the pedestal for supporting the
beams, and wherein the intermediate pedestal frame comprises: a
pair of leg members; a pair of base plates for supporting the leg
members of the intermediate pedestal frame, respectively; and a
connecting member for rigidly connecting the leg members of the
intermediate pedestal frame to each other with a given length.
7. The raised floor skeleton structure as claimed in claim 6,
wherein at least one of the pedestal units further comprises: an
additional beam arranged at a side of the beams of the at least one
of the pedestal units; a plurality of additional pedestal frames
for supporting the additional beam, wherein each additional
pedestal frame comprises: an additional leg member; an additional
base plate for supporting the additional leg member; and an
extending member extending from the additional leg member with a
predetermined span to the beam arranged at the side of the
additional pedestal frames, the additional leg member being rigidly
connected through the extending member at a tip of the extending
member to at least one of the pedestal frames and the beam that is
arranged at the side of said additional pedestal frame.
8. The raised floor skeleton structure as claimed in claim 5,
wherein at least one of the pedestal units further comprises: an
additional beam arranged at a side of the beams of the at least one
of the pedestal units; a plurality of additional pedestal frames
for supporting the additional beam, wherein each additional
pedestal frame comprises: an additional leg member; an additional
base plate for supporting the additional leg member; and an
extending member extending from the additional leg member with a
predetermined span to the beam arranged at the side of the
additional pedestal frames, the additional leg member being rigidly
connected through the extending member at a tip of the extending
member to at least one of the pedestal frames and the beam that is
arranged at the side of said additional pedestal frame.
9. A method of installing on a floor a pedestal unit comprising a
pair of beams arranged in parallel and more than two pedestal
frames each including leg members and a connecting member in a
bridge shape and leveling mechanism provided to each of the leg
members, the method comprising the steps of: installing two of the
pedestal frames at both ends of the beams, respectively;
controlling the leveling mechanism of the two of the pedestal
frames to level the beams; and after leveling the two of the
pedestal frames, installing a remaining part of more than the two
pedestal frames.
10. A method of installing on a floor a pedestal unit comprising a
pair of beams and more than two pedestal frames each including leg
members and a connecting member and a height control mechanism
provided to each of the leg members, the method comprising the
steps of: installing the pedestal frames to support at least both
ends of the beams; controlling the height control mechanism of the
pedestal frames supporting both ends of the beams to level the
beams; after controlling the height control mechanisms of the
pedestal frames at both ends of the beams to level the beams,
installing a remaining part of more than the two pedestal frames;
and controlling the height control mechanisms of the pedestal
frames other than the pedestal frames at both ends.
11. A method of installing a pedestal unit comprising a pair of
beams, two first pedestal frames for supporting both ends of the
beams, and at least one of second pedestal frames including
supporting surfaces for supporting intermediate portions of the
beams and an lower surface, each of the first and second pedestal
frames being provided with a height control mechanism, the method
comprising the steps of: (a) installing the first pedestal frames
on a floor at both ends of the beams and fixing the first pedestal
frames at the both ends of the beams to the beams, respectively;
(b) controlling the height control mechanisms of the first pedestal
frames to level the beams; (c) after the step (b), fixing the
supporting surfaces of the second pedestal frame to the
intermediate portions of the beams, respectively; (d) after the
step (c) , controlling the height control mechanism of the second
pedestal frames to make the lower surfaces of the pedestal frames
in contact with the floor; and (e) fixing the lower surfaces to the
floor.
12. A method of producing a pedestal frame that is arranged on a
floor and includes supporting surfaces that supports beams for
supporting a raised floor, the method comprising the steps of:
casting the pedestal frame to include mounds on the supporting
surfaces; and cutting the mounds to provide the supporting
surfaces.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a pedestal unit, a raised
floor skeleton structure, a method of installing pedestal units,
and a method of producing a pedestal frame.
BACKGROUND OF THE INVENTION
[0002] Pedestal units for constructing a raised floor are known.
Such a pedestal unit having four legs for providing a skeleton
structure for a raised floor (double floor structure) is disclosed
in Japanese laid-open Utility Model application publication No.
5-43154.
[0003] FIG. 15 shows a related art skeleton structure for the
raised floor using the pedestal unit, in which a pedestal unit
array including a plurality of pedestal units 110 arranged with
gaps is installed on a floor slab, beams 120 are bridged between
consecutive skeleton structures 100, and deck panels 130 are
bridged between the skeleton units 100 including the pedestal unit
110 and the beams 120.
[0004] Such a raised floor is frequently installed in a room in
which a large number of communication units or computers are
installed. More specifically, heavy units D such as a communication
unit are mounted on the skeleton structure 100, and a plurality of
floor panels 130 bridged between skeleton structures arranged with
a gap are used as a passage as well as lids for inspection.
[0005] Since the floor surface of the raised floor should be
horizontally arranged, the skeleton structures 100 are required to
be horizontally installed. More specifically, each pedestal unit
110 should be horizontally installed and thus heights of upper
surfaces of pedestal units 110 should be equalized.
[0006] The operation of horizontally installing each pedestal unit
110 having four legs was very burdensome. To be more specific, each
pedestal unit 110 requires height adjustment at four places for
leveling as well as requires height adjustment between the upper
surface thereof and those of the neighboring pedestal units 100. In
other words, in a minimum unit including two consecutive pedestal
units 110 supporting two beams 120, these pedestal units require
the height adjustment at eight places for leveling.
SUMMARY OF THE INVENTION
[0007] According to the present invention, there is preferably
provided a pedestal unit capable of readily constructing a skeleton
structure for a raised floor, and a method of installing the
pedestal units for the raised floor.
[0008] According to the represent invention, there is preferably
provided a raised floor skeleton structure for the raised floor
with the pedestal units capable of being readily constructed.
[0009] According to the invention, there is preferably provided a
method of producing the pedestal unit used for readily constructing
the skeleton structure for the raised floor.
[0010] According to a first aspect of the present invention
provides a pedestal unit usable for a raised floor, the pedestal
unit comprising: a pair of beams; and a pair of pedestal frames for
supporting both ends of the beams, respectively, wherein each
pedestal frame comprises: a pair of leg members; a pair of base
plates for supporting the leg members, respectively; and a
connecting member for rigidly connecting the leg members to each
other with a predetermined interval.
[0011] This pedestal unit provides a high efficiency in an
installation process. The conventional pedestal unit requires
height control at eight places of the each pedestal unit. On the
other hand, this pedestal unit according to the present invention
can reduce the number of places to be adjusted for leveling to two
for each pedestal frame, i.e., four places in total for each
pedestal unit. The leg members and the connecting member of the
pedestal frame may be unitedly shaped or independently shaped.
Further, the dimensions of the pedestal frame may be a half of that
of the conventional pedestal frame, so that weight of each pedestal
frame also decreases, which provides an easy installation
process.
[0012] A second aspect of the present invention provides a pedestal
unit based on the first aspect, wherein an intermediate pedestal
frame that is arranged between a pair of the pedestal frames for
supporting the beams, the intermediate pedestal comprising: a pair
of leg members; a pair of base plates for supporting the leg
members of the intermediate pedestal frame, respectively; and a
connecting member for rigidly connecting the leg members of the
intermediate pedestal frame each other with a given length.
[0013] This pedestal unit supports two beams with more than two
pedestal frames and thus more preferable for the case that heavy
units are loaded on the pedestal units. Each pedestal frame has a
bridge shape, so that the length thereof along the beams is short,
which provides high degree of freedom in arrangement thereof. More
specifically, even if a lot of intermediate pedestal frames are
installed, each intermediate pedestal frame does not interfere with
the pedestal frames at both ends of the beams and other
intermediate pedestal frames. As a result, if there is a request
for supporting a heavy unit at a particular place, only addition of
the intermediate pedestal frame increases the load capacity at the
particular place. Furthermore, the beam is not fixed at two points
but more than two points per pedestal frame, which provides a
so-called continuous beam structure having an extremely high
strength.
[0014] A third aspect of the present invention provides a pedestal
unit based on the first aspect, wherein an additional beam arranged
at a side of a pair of the beams and a plurality of additional
pedestal frames for supporting the additional beam are further
provided, and wherein each of the additional pedestal frames
comprises: an additional leg member; an additional base plate for
supporting the additional leg member; and an extending member
extending from the additional leg member with a predetermined span
to the beam arranged at the side of the additional pedestal frames,
the additional leg member being rigidly connected through the
extending member at a tip of the extending member to at least one
of the pedestal frames and the beam that is arranged at the side of
said additional pedestal frame.
[0015] This pedestal unit further comprises the additional beam at
at least one of sides of the two beams. This pedestal unit includes
at least three beams. This provides secure mount for a heavy unit
or a wide unit. Further, the additional pedestal frames and an
additional beam are installed at a side of the basic pedestal unit.
Thus, the modifying process can be carried out with the heavy units
mounted on other pedestal units remaining as they are, even if any
pedestal unit at a given place is modified.
[0016] A fourth aspect of the present invention provides a raised
floor skeleton structure for supporting a raised floor, the raised
floor skeleton structure comprising: a plurality of pedestal units
each comprising: a pair of beams; and a pedestal frame for
supporting the beams at one ends of the beams, wherein each
pedestal frame comprises: a pair of leg members; a pair of base
plates for supporting the leg members, respectively; and a
connecting member with a predetermined length for rigidly
connecting the legs member each other, wherein a plurality of the
pedestal units are sequentially connected in a longitudinal
direction of the beams, wherein one ends of the beams of a one of
pedestal units confronts the other ends of the beams of another one
of pedestal units neighboring the one of the pedestal units, and
wherein the pedestal frame of the one of pedestal unit comprises
first regions for supporting the one ends of the beams of the one
of the pedestal unit and second regions for supporting the other
ends of the beams of the another one of the pedestal unit.
[0017] This skeleton structure provides the raised floor with a
high accuracy in assembling even if a plurality of pedestal units
are connected since the beams are continuously arranged over its
total length of the skeleton structures. For example, even if heavy
units are mounted on the beam, the accuracy of installation will be
kept very high.
[0018] A fifth aspect of the present invention provides a method of
installing on a floor a pedestal unit comprising a pair of beams
arranged in parallel and more than two pedestal frames each
including leg members and a connecting member in a bridge shape and
a leveling mechanism provided to each of the leg members, the
method comprising the steps: installing two of the pedestal frames
at both ends of the beams; controlling the leveling mechanism of
the two of the pedestal frames to level the beams; and after
leveling the two of the pedestal frames, installing remaining part
of more than the two pedestal frames.
[0019] This method causes the installation process to have a very
high efficiency. More specifically, after the beams are leveled
with the leveling mechanism of the pedestal frames at both ends of
the beams, heights of pedestal frames at an intermediate position
of the beam are determined only by equalizing the height (vertical
length) of the intermediate pedestal frame to the height of the
beams from the floor.
[0020] A sixth aspect of the present invention provides a method of
installing on a floor a pedestal unit comprising a pair of beams
and more than two pedestal frames each including leg members and a
connecting member and a height control mechanism provided to each
of the leg members, the method comprising the steps of: installing
the pedestal frames to support at least both ends of the beams;
controlling the height control mechanism of the pedestal frames
supporting both ends of the beams to level the beams; after
controlling the height control mechanism of the pedestal frames at
both ends of the beams to level the beams, installing a remaining
part of more than the two pedestal frames; and controlling the
height control mechanism of the pedestal frames other than the
pedestal frames at both ends.
[0021] This method of installing the pedestal unit can level the
upper surfaces of beams only by controlling the heights of two
pedestal frames at the both ends of the beams. This improves the
efficiency of the installation process. In other words, this
structure does not require control of the heights of all pedestal
frames.
[0022] According to a seventh aspect of the present invention
provides a method of installing a pedestal unit comprising a pair
of beams, two first pedestal frames for supporting both ends of the
beams, and at least one of second pedestal frames including
supporting surfaces for supporting intermediate portions of the
beams and lower surfaces, each of the first and second pedestal
frames being provided with a height control mechanism, the method
comprising the steps of: (a) installing the first pedestal frames
on a floor at both ends of the beams and fixing the first pedestal
frames at the both ends of the beams to the beams, respectively;
(b) controlling the height control mechanism of the first pedestal
frames to level the beams; (c) after the step (b), fixing the
supporting surfaces of the second pedestal frame on the
intermediate portions of the beams, respectively; (d) after the
step (c), controlling the height control mechanism of the second
pedestal frames to make the lower surfaces of the pedestal frames
in contact with the floor; and (e) fixing the lower surfaces to the
floor.
[0023] This method of installing the pedestal units can level the
upper surfaces of the beams only by controlling the heights of the
pedestal frames at both ends of the beams. This improves the
installation efficiency. In other words, the height adjustment for
the intermediate pedestal frame 10' can be carried out with
reference to the height of the beams that have been leveled.
[0024] An eighth aspect of the present invention provides a method
of producing a pedestal frame that is arranged on a floor and
includes supporting surfaces supporting beams for supporting a
raised floor, the method comprising the steps: casting the pedestal
frame to include mounds on the supporting surfaces; and cutting the
mounds to provide the supporting surfaces.
[0025] If the pedestal frame is produced by casting, actually, it
is frequent that accuracy in dimension of the supporting surfaces
of the pedestal frames for the beams disperses from the designed
values due to twisting and errors in dimension of the mold and heat
processing. However, casting the whole of the pedestal frame
provided with the mound layer previously on the supporting surface
for the beam and then, cutting the supporting surface provides
accurate even supporting surfaces for installation as well as the
mound can be used as a draft angle.
[0026] The pedestal unit and the method of installing the pedestal
unit according to the present invention improves installation in
efficiency, namely, provides, easy construction of the skeleton
structure for the raised floor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The object and features of the present invention will become
more readily apparent from the following detailed description taken
in conjunction with the accompanying drawings in which:
[0028] FIG. 1 is a perspective view of pedestal units according to
a first embodiment of the present invention;
[0029] FIG. 2 is a perspective view of the pedestal unit according
to the first embodiment of the present invention;
[0030] FIG. 3 is a perspective view of a pedestal frame according
to the first embodiment of the present invention;
[0031] FIG. 4 is a front view of the pedestal frame according to
the first embodiment of the present invention;
[0032] FIG. 5 is a side view of the pedestal frame according to the
first embodiment of the present invention;
[0033] FIG. 6 is a cross sectional view of a beam according to the
first embodiment of the present invention;
[0034] FIG. 7A is a side view of the pedestal unit according to the
first embodiment of the present invention;
[0035] FIG. 7B is an enlarged view of the leftmost portion of the
beam FIG. 7A;
[0036] FIG. 7C is an enlarged view of FIG. 7A at the intermediate
portion of the beam in FIG. 7A;
[0037] FIG. 7D is an enlarged view of the rightmost portion of the
beam in FIG. 7A;
[0038] FIG. 8 is a side view of the installed pedestal unit
adjacent to a wall according to the first embodiment of the present
invention;
[0039] FIG. 9 is a perspective view of a floor panel according to
the present invention;
[0040] FIG. 10 is a perspective view of the pedestal unit in a
disassembled condition for illustrating a method of installation
according to the first embodiment of the present invention;
[0041] FIG. 11 is a perspective view of pedestal units according to
a second embodiment of the present invention;
[0042] FIG. 12 is a front view of an additional pedestal frame
according to the second embodiment of the present invention;
[0043] FIG. 13 is a perspective view of the pedestal unit in a
disassembled condition for illustrating a method of installation
according to the second embodiment of the present invention;
[0044] FIG. 14A is a side view of a leg member for illustrating a
method of producing the pedestal frame according to the present
invention;
[0045] FIG. 14B is a partially enlarged view of the leg member
shown in FIG. 14A; and
[0046] FIG. 15 is a perspective view of a related art skeleton
structure.
[0047] The same or corresponding elements or parts are designated
with like references throughout the drawings.
DETAILED DESCRIPTION OF THE INVENTION
[0048] Hereinafter, embodiments according to the present invention
will be described with reference to drawings with an example in
which a raised floor is constructed in a communication unit room in
which electronic units such as a communication unit and a computer
are installed.
[0049] First Embodiment
[0050] Referring now to FIG. 1, a raised floor structure (double
floor structure) for a communication unit room is shown. The
skeleton structures H according to the first embodiment comprise a
plurality of pedestal units 1 connected in series and arranged in a
direction with a predetermined gap to construct a raised floor.
[0051] The raised floor installed in the communication unit room is
constructed to provide heavy unit installing regions G where heavy
electronic units such as a communication unit are installed,
general passages I provided between the heavy unit installing
regions G, a main passage M extending perpendicularly to the
general passages I, and an air-conditioning unit installing region
E. The heavy unit installing region G and the air-conditioning unit
installing region E are provided with the skeleton structures H and
a skeleton structure H', respectively, placed on a floor slab S, in
which heavy units (not shown) are installed on the skeleton
structures H, and air-conditioning units (not shown) are installed
on the skeleton structure H'.
[0052] The general passage I is provided with floor panels P placed
between skeleton structures H that are arranged at the
predetermined interval, and the main passage M is provided with
floor panels P' placed between the skeleton structures H and H' or
between the general passage I and the skeleton structure H'.
[0053] The air-conditioning units installed at the air-conditioning
unit region E eject cooled air into space between the raised floor
and the floor slab S to remove heat generated by communication
units installed at the heavy unit installing regions G.
[0054] Although the structure and material of the floor panel P are
not particularly limited, for example, as shown in FIG. 9, the
floor panel P is constructed with a planar body P1 which is
provided by cutting an extruded aluminum alloy member with an
appropriate length and end plates P2.
[0055] Pedestal Unit
[0056] The pedestal unit 1 comprises, as shown in FIG. 2, a pair of
beams 20, a pair of pedestal frames 10 for supporting both ends of
the beams 20, respectively, and an intermediate pedestal frame 10'
arranged between the pedestal frames 10 for supporting the beams
20. The intermediate pedestal frame 10' has the same structure as
the pedestal frames 10 and thus the detailed description of the
intermediate pedestal frame will be omitted.
[0057] This embodiment shows an example in which an intermediate
pedestal frame 10' is arranged between a pair of pedestal frames
10. However, a larger number of the intermediate frames 10' may be
installed in accordance with a load applied to the beams 10 or a
loading condition. Further, the intermediate frame 10' may be
omitted.
[0058] Hereinafter, "inside" or "inner" means the region between
the leg member 10A and under the connecting member 10B inclusively,
and "outside" or "outer" is the outside of them.
[0059] In FIG. 2, a front of the pedestal frame 10 (intermediate
pedestal frame 10') is shown as this side of the drawing and the
rear portion of the pedestal frame 10 is hidden.
[0060] Pedestal Frame
[0061] The pedestal frame 10 (10') comprises, as shown in FIG. 2, a
pair of leg members 10A vertically standing on the floor slab S, a
connecting member 10B horizontally extending with a predetermined
length for rigidly connecting a pair of the leg members 10A each
other, and plate-like supporting members extending at the upper end
of the leg members 10A along the beams 20, in which the front view
of the pedestal frame looks like a bridge. In addition, a leveling
mechanism 50 is provided between the lower end of the leg member
10A and the floor slab S to adjust the level of the pedestal frame
10 for leveling the raised floor.
[0062] The leg member 10A comprises, as shown in FIG. 3, a bottom
plate 11, a leg flange 12 vertically extending from the rear edge
of the bottom plate 11, and a side wall 13 vertically extending
from the side edge of the bottom plate 11.
[0063] At the substantially middle of the bottom plate 11, a
through hole 11a is formed to be pierced by a leveling bolt 52 (see
FIG. 4). At an inside edge of the leg flange 12 (arch side of leg
flange 12 and connecting member 10B), a rib 12a is formed.
[0064] As shown in FIG. 4, a plurality of openings 12b (two in this
embodiment) are formed in the leg flange 12. This lightens the
pedestal frame 10 and allows the air from the air-conditioning unit
to flow therethrough increasing an efficient of cooling.
[0065] At an upper portion of the leg flange 12 (at a boundary
thereof with the connecting member 10B) on which stresses
concentrate, a thick portion 12c having a thickness greater than
other portions is provided.
[0066] The side wall 13 has an L-shape in the side view of the leg
flange 12. At an edge of the side wall 13, a rib 13a is formed from
the lower end of the side wall 13 to the lower surface of the
supporting member 10C. At the substantially middle of the side wall
13, three holes 13b are formed for mounting a rack (not shown) for
binding cables for the heavy units. At an upper end of a rear edge
of the side wall 13, a stiffener 13c is formed with a triangle form
along the lower surface of the supporting member 10C.
[0067] The connecting member 10B comprises, as shown in FIG. 4, a
connecting flange 14 bridging between the thickness portion 12c of
one leg flange 12 and the thick portion 12c of the other leg flange
12, an upper rib 15 formed along an upper edge of the connecting
flange 14, and an under rib 16 formed at the lower edge of the
connecting flange 14.
[0068] In the connecting flange 14, a plurality of openings 14a
(six in this embodiment) are formed, which lighten the pedestal
frame 10 and allow the air from the air-conditioning unit to flow
therethrough, increasing an efficient of cooling.
[0069] At the middle of the connecting flange 14 on which stresses
concentrate, a thick portion 14b that is thicker than other
portions is formed.
[0070] The upper rib 15 extends, as shown in FIG. 3, from the upper
edge of the connecting flange 14 in the front direction and the
rear direction, and both side ends are connected to the supporting
members 10C, respectively. A lower rib 16 extends in the front
direction from the lower edge of the connecting flange 14, and both
side ends are connected to the ribs 12a of the leg flanges 12,
respectively.
[0071] The upper rib 15 and the lower rib 16 are provided to the
connecting flange 14, which can compensate decrease in strength by
forming the openings 14a (see FIG. 4) in the connecting flange
14.
[0072] The supporting member 10C includes, as shown in FIG. 3, a
first region 17 extending from the leg flange 12 of the leg member
10A in the front direction and a second region 18 extending from
the leg flange 12 of the leg member 10A in the rear direction,
wherein the first region 17 has a longer length than the second
region 18.
[0073] The first region 17 is formed along an upper edge of the
sidewall 13 and its upper surface is flat. At the tip of the first
region 17, a pair of fixing holes 17a are formed in the supporting
member 10C at the both sides of the side wall 13. At the foundation
portion of the first region 17, a pair of second fixing holes 17b
are formed in the supporting member 10C. The second region 18 is
formed along an upper edge of the stiffener 13c. At the second
region 18 of the supporting member 10C, a pair of third fixing
holes 18a are formed in the supporting member 10C at the both sides
of the stiffener 13c. The first region is connected to the second
region 18.
[0074] The shorter length of the second region 18 than that of the
first region 17 allows a closer access of the edge of the pedestal
unit 1 to a wall of the room. More specifically, when the pedestal
frame 10 located nearest to the wall of the room is installed such
that the second region 18 of the supporting member 10C of the
pedestal flame 10 confronts to the wall, the edge of the pedestal
unit 1 is arranged to be adjacent to the wall, which results in
spreading of the heavy unit installing region G (see FIGS. 1 and 8)
to walls of the communication unit room.
[0075] The pedestal frame 10 has weight that is substantially half
of that of the conventional pedestal unit 110 having four legs (see
FIG. 15), which remarkably improves a working efficiency of
installing process.
[0076] In addition, the beams 20 are placed on the supporting
members 10C of the pedestal frame 10, and on the beams 20, heavy
units D are installed, so that the height of the pedestal frame 10
becomes lower than that of the conventional one, which further
contributes lightening the weight thereof.
[0077] The pedestal frame 10 is formed by casting an aluminum alloy
and molded so as to unitize the pedestal frame 10, the leg member
10A, and the connecting member 10B, and the supporting member 10C.
Forming the pedestal frame 10 by casting an aluminum alloy can make
use of features of the aluminum alloy which is light with enough
strength and a good corrosion resistance under the same strength
condition. Further, lightweight of the pedestal frame 10 provides
easy handling. In addition, formation of the pedestal frame 10 by
casting reduces the number of processes after casting, even if an
optimum design without redundancy is aimed.
[0078] If the pedestal frame 10 is formed by casting, it was
frequently difficult to secure accuracy in dimensions against the
designed values of a smoothness at the first and second regions 17
and 18 (hereinafter, may be referred to as a beam supporting
surface A), equality in height of the beam supporting surface A
between each pair of the pedestal frames 10, and equality in height
of the beam supporting surface A between different pedestal frames
10 (see FIG. 14). To solve the problem, for example, the pedestal
frame 10 is formed such that the final beam supporting surface A is
provided with a thickness t1 for the supporting member 10C that is
necessary for supporting the beam 20 and a mound 19 on the
supporting member 10C. After a heat process, the beam supporting
surface A is subject to milling with a milling machine (not shown)
to remove the mound 19. The mound 19 is preferably formed with a
mound layer 19a provided with taking account of twist on casting
and a slope 19b provided as a slope for die cutting. A thickness t2
of the mound layer 19a is, for example, 2 mm, and the slope 19b
rises from the front edge of the first region 17 toward the rear
end of the second region 18 at .theta.=1.degree..
[0079] As mentioned above, the whole of the pedestal frame 10 is
cast with the mound 19 on the beam supporting surface A, and then,
the beam supporting surface A is milled, which makes the beam
supporting surfaces A of a pair of leg members 10A smooth and
equalizes the heights of the beam supporting surfaces A between a
pair of pedestal frames 10 and among different pedestal frames 10.
This remarkably facilitates leveling upon installation with a high
quality of installation. In addition, the mound 19 can be used as
the slope for die cutting accompanying the casting, which also
facilitates designing a mold.
[0080] Leveling Mechanism
[0081] As shown in FIG. 4, the leveling mechanism 50 comprises a
base plate 51 fixed to the floor slab S with anchor bolts 51a, an
adjustment bolt 52 to be stood on the base plate 51, a lower nut 53
and an upper nut 54 into which the adjusting bolt 52 is to be
screwed, the lower nut 53 and the upper nut 54 sandwiching the
bottom plate 11. Adjusting the positions of the lower and upper
nuts 53 and 54 controls the level of the leg member 10A. Then, the
leveling mechanism 50 at the other pedestal frame 10 is adjusted to
level the upper surface of the supporting member 10C.
[0082] Beam
[0083] As shown in FIG. 6, the beam 20 is fixed to the beam
supporting surface A of the supporting member 10C of the pedestal
frame 10 so as to be supported by the pedestal frame 10. In this
embodiment, the beam 20 comprises a tubular body 21 including a
step member 22 (hereinafter, also referred to as mounting member
22) and a fixing member 23 horizontally extending from an upper
edge of the body 21 inwardly (to the right of the body 21 in FIG.
6).
[0084] Inside the body 21, a horizontal reinforce wall 21a having
substantially the same height as the mounting member 22, and a
slantwise reinforcing wall 21b for connecting an end of the
horizontal reinforcing wall 21a to a first connecting groove 24 are
formed. This structure secures sufficient yield strength against
loads in general conditions and at earthquake.
[0085] At the lower part of the body 21, first connecting grooves
24 each having an opening that is downwardly directed, and under
the mounting member 22 at a side of the body 21, a second
connecting groove 25 having an opening outwardly directed is
formed. At an upper edge of the body 21, a first packing groove 26
having an opening outwardly directed is formed, and a second
packing groove 27 having an opening upwardly directed is formed in
the mounting member 22.
[0086] In the fixing member 23, a plurality of fixing holes 23a are
formed with a predetermined interval in the longitudinal direction
of the beam 20 and bolts B2 for fixing the heavy units are pierced
fixing holes 23a.
[0087] In addition, if a connection groove (not shown) is provided
to the fixing member 23, although the heavy units mounted on the
upper surface of the fixing member 23 have dimensions according to
different standards, the heavy unit can be readily fixed to the
connection groove.
[0088] In the first connecting groove 24, heads of bolts B1 for
fixing the supporting member 10C of the pedestal frame 10 to the
beam 20 are set. In addition, at the inner wall of the first
connecting groove 24, a protrusion 24a is formed to be in contact
with the bolt B1 to prevent the bolt B1 from rotating during
fixing.
[0089] An internal dimension of the first connecting groove 24 is
equalized to a short side of a plate washer W1 having through holes
into which the heads of the bolts B1 are inserted. In addition, on
a lower surface of the plate washer W1, edges (not shown) are
formed so as to extend perpendicular to the longitudinal direction
of the first connecting groove 24. As a result, when the bolt B1 is
fastened, the edges enter a lower wall the first connecting groove
24, which prevents the bolt B1 from moving in the longitudinal
direction of the beam 20.
[0090] In the second connecting groove 25, bolts for fixing
additional pedestal frames 30 mentioned later (see FIG. 12) may be
inserted. However, this structure is the same as the first
connecting groove 24 mentioned above, so that a detailed
description will be omitted.
[0091] In the first packing groove 26, a first packing 26a is
inserted to intervene with the edge surface of the floor panel P
(end plate P2). In the second packing groove 27, a second packing
27a is inserted to intervene with the lower surface of the floor
panel P.
[0092] The beam 20 comprises an extrusion member made of an
aluminum alloy having a cross section shown in FIG. 6 that is
continuously shown along the longitudinal direction of the beam 20
(vertical direction in the drawing).
[0093] As mentioned above, the first connecting groove 24 and the
second connecting groove 25 are continuously formed in the
longitudinal direction of the beam 20, so that the bolts B1 can be
shifted at desired places. This facilitates the installing process,
although an error occurs in the installation of the raised floor.
In addition, after use of the raised floor if, for example, a new
intermediate pedestal frame 10' is required to be added, the
addition can be easily provided. More specifically, the first
connecting groove 24 is continuously formed in the longitudinal
direction of the beam 20, which allows the bolts B1 at desired
positions along the longitudinal direction. In other words, even if
the new intermediate pedestal frame 10 is added, there is no
necessity of making fixing holes in the beam 20.
[0094] In the first and second connecting grooves 24 and 25, the
openings are partially widened at appropriate locations. In other
words, for example, opening edge portions 24c of the first
connecting groove 24 has notches which allow the heads of bolts B1
and the plate washers W1 are inserted into the first connecting
groove 24. Alternatively, the heads of bolts B1 and the plate
washers W1 may be inserted in advance into the first connecting
groove 24.
[0095] As mentioned above, the beam 20 is made using an extrusion
member comprising the aluminum alloy, which facilitates assembling
and modifying the pedestal units 1 in addition to advantageous
effect in that the beam 20 is light with enough strength and a good
corrosion resistance relative to its strength. Further, when beams
20 having different lengths are requested, it is sufficient only to
cut the extrusion member with different dimensions, which can
reduce the manufacturing cost.
[0096] The beams 20 constructed as described above are fixed at
both ends to the pedestal frames 10, and its middle portion is
fixed to the intermediate pedestal frame 10', as shown in FIG.
7A.
[0097] More specifically, as shown in FIG. 7B, one end of the beam
20 (the left end of the beam in FIG. 7A) is placed on the second
region 18 of the supporting portion 10C, in which the bolts B1 of
which heads are charged in the first connecting grooves 24 are
inserted through the third fixing holes 18a (see FIG. 3), and ends
of the bolts B1 protruding downwardly are screwed and fastened with
the nuts N1 to fix the beam 20 on the pedestal frame 10.
[0098] Similarly, the other end of the beam 20 is, as shown in FIG.
7D, is placed on the first region 17 of the supporting portion 10C,
in which the bolts B1 of which heads are charged in the first
connecting grooves 24 are inserted through the first fixing holes
17a and the second fixing holes 17b (see FIG. 3), and ends of the
bolts B1 protruding downwardly are screwed and fastened with the
nuts N1 to rigidly fix the beam 20 to the pedestal frame 10.
[0099] Furthermore, the intermediate portion of the beam 20 is, as
shown in FIG. 7C, is placed on the first and second regions 17 and
18 of the supporting portion 10C, in which bolts B1 of which heads
are charged in the first connecting grooves 24 are inserted through
the first and third fixing holes 17a and 18a (see FIG. 3), and ends
of the bolts B1 protruding downwardly are screwed and fastened with
the nuts N1 to fix the beam 20 to the pedestal frame 10. Thus, the
intermediate portion of the beam 20 is fixed to the pedestal frame
10 at two positions in the longitudinal direction of the beam 20,
which provides rigid fixation of the beam 20 to the pedestal frame
10.
[0100] Thus, both ends and the intermediate portion of the beam 20
are rigidly fixed with the pedestal frames 10 and the intermediate
pedestal frame 10', to provide a rigid frame structure.
[0101] As mentioned above, in the pedestal unit 1 according to the
first embodiment, the beam 20 is continuously supported by the
three pedestal frames 10 and 10', in which the rigid frame
structure is provided in the pedestal frame and assembled structure
by installation.
[0102] In this embodiment, the beam 20 is rigidly fixed to the two
pedestal frames 10 and 10' out of three pedestal frames 10 and 10'.
However, rigidly fixing the beam 20 to at least one pedestal frame
10 or 10' provides a rigid pedestal unit 1.
[0103] Method of Installing Pedestal Units
[0104] As shown in FIG. 10, first, the pedestal frames 10 for
supporting both ends of the beams 20 are fixed in a standup
position on the floor slab S. More specifically, the leveling
mechanism 50 is fixed to the leg member 10A of the pedestal frame
10, and then at a predetermined position on the floor slab S,
anchor bolts 51a are hit into the floor slab S from the upper side
of each base plate 51 (see FIG. 4).
[0105] Next, both leveling mechanisms 50 of each pedestal frame 10
are controlled by adjusting the lower nuts 53 and the upper nuts 54
to make the upper surface of the pedestal frame 10 approximately
horizontal as well as levels of neighboring pedestal frames 10 are
approximately equalized to this pedestal frame 10.
[0106] Subsequently, two beams 20 are mounted on consecutive two
pedestal frames 10 and fixed to the supporting members 10C with the
bolts B1 of which heads are charged into the first connecting
grooves 24. More specifically, one end of each beam is, as shown in
FIG. 7B, mounted on the second region 18 and the other end of the
beam 20 is, as shown in FIG. 7D, mounted on the first region 17.
Each beam 20 is fixed to the pedestal frames 10 with a plurality of
bolts B1 of which heads are charged into the first connecting
grooves 24 (see FIG. 6) and nuts N1.
[0107] Next, at each pedestal frame 10, the upper surface of the
beam 20 (the upper surface of the pedestal unit 1) is made
horizontal. In this process, the upper surface of each pedestal
unit 1 can be made horizontal by adjustment at two places for each
pedestal frame 10, so that the upper surfaces of the pedestal unit
1 can be made horizontal at four places in total, which provides a
high efficiency in installing process.
[0108] Next, at the intermediate place of the beams 20, the
intermediate pedestal frame 10' is placed on the floor slab S, and
then the upper surface of the supporting member 10C is in contact
with the lower surfaces of the beams 20, and is fixed by screwing
with a plurality of the bolts B1 and the nuts N1 to the upper
surface of the beams 20. Subsequently, a lower surface of the base
plate 51 is made in contact with the floor slab S by controlling
the leveling mechanism 50, and then the base plate 51 is fixed with
anchor bolts 51a. Thus, this process has a higher efficiency in
installation.
[0109] Further, the intermediate pedestal frame 10' can be
installed after installation of the beams 20. In other words, the
intermediate pedestal frame 10' can be additionally installed not
only during the initial installation but also after use of the
raised floor. Thus, the pedestal unit 1 has such a structure as to
be easily reinforced, repaired, and to allow the heavy units to be
moved and replaced.
[0110] Skelton Structure
[0111] As shown in FIG. 1, the skeleton structure H comprises a
plurality of pedestal units 1 arranged in a longitudinal direction
of the pedestal unit 1 (beams 20).
[0112] The skeleton structure H may be constructed by arranging a
plurality of pedestal units 1 with a predetermined gap in the
longitudinal direction of the pedestal units 1 and connecting
neighboring pedestal units 1 with appropriate beams. However, more
preferably, as shown in FIGS. 7A and 7D, ends of beams 20 of one of
consecutive two pedestal units are mounted on and fixed to the
pedestal frame 10 of the other pedestal unit 1 to provide
continuity of the beams 20. Thus, the pedestal frame 10 located at
an end of the pedestal unit 1 is commonly used between the pedestal
unit 1 and the neighboring pedestal units 1' (see FIG. 7A).
[0113] With this structure, the beams 20 are continuously arranged
along the whole of the skeleton structure H. As a result, even if
heavy units are mounted on the beams 20, this structure provides a
high accuracy in assembling.
[0114] In addition, as shown in FIG. 8, in the pedestal unit 1
arranged beside the wall of the room, the pedestal frame 10 is
preferably arranged with its direction inversed (opposite to that
of the other pedestal frame). In other words, the pedestal frame 10
located beside the wall of the room is arranged with the second
region 18 (see FIG. 3) having a shorter length of its extending
portion directed to the wall of the room.
[0115] This structure makes the heavy unit installing region G (see
FIGS. 1 and 8) expanding to ends of the room.
[0116] Second Embodiment
[0117] A pedestal unit 2 according to a second embodiment is used
for stably mounting heavy units having dimension larger than that
in the first embodiment. The pedestal unit 2 comprises, as shown in
FIG. 11, the pedestal unit 1 (hereinafter, referred to as a basic
pedestal unit 1) and an additional pedestal unit 2 arranged at the
side of the basic pedestal unit 1.
[0118] Additional Pedestal Unit
[0119] The additional pedestal unit 2 comprises an additional beam
40 arranged at the side of the beam 20 of the basic pedestal unit 1
and a plurality of additional pedestal frames 30 arranged under the
additional beam 40.
[0120] Additional Leg Frame
[0121] The additional pedestal frame 30 comprises, as shown in FIG.
12, a leg member 30A vertically standing on the floor slab S, an
extending member 30B extending from the leg member 30A to the beam
20 of the basic pedestal unit 1, and plate-like supporting member
30C, at the upper end of the leg member 30A, extending along the
beams 20, in which the front view looks like a letter of L. In
addition, the leveling mechanism 50 is provided between the lower
end of the leg member 30A and the floor slab S to adjust the level
of the leg member 30A.
[0122] The leg member 30A comprises a bottom plate 31, a leg flange
32 vertically extending from the rear edge of the bottom plate 31,
and a side wall 33 vertically extending from the side edge of the
bottom plate 31. This structure is the same as the leg member 10A
of the pedestal frame 10 in the first embodiment, and thus, a
detailed description will be omitted.
[0123] The leg member 30B comprises an extending flange 34
horizontally extending with a predetermined length (span) from a
thick member 32c of the leg flange 32, an upper rib 35 formed along
the upper edge of the extending flange 34, an under rib 36 formed
along an under edge of the extending flange 34, and a mounting
bracket 39 having a shape of letter "L" in its a cross section.
[0124] In the extending flange 34, a plurality of openings 34a (two
in this embodiment) are formed. This lightens the additional
pedestal frame 30 and allows the air from the air-conditioning unit
to flow therethrough, increasing an efficient of cooling.
[0125] At a tip of the upper rib 35, as shown in FIG. 13, a pair of
fixing holes 35a are formed, and in the mounting bracket 39, a pair
of fixing holes 39a are formed at the locations corresponding to
the fixing holes 35a.
[0126] The supporting member 30C comprises, as shown in FIG. 13, a
first region 37 extending in the front thereof (along the beam 40)
and a second region 38 extending in the rear direction thereof
(along the beam 40). These members are similar to those in the
pedestal frame 10 in the first embodiment and thus, the detailed
description will be omitted.
[0127] The beam 40 for additionally installation is, as shown in
FIGS. 11 and 12, are supported on the upper surface of the
supporting member 30. Its structure is the same as the beam 20, and
thus a detailed description will be omitted.
[0128] Method of Installing the Additional Leg Frame
[0129] First, the mounting bracket 39 is, as shown in FIG. 13,
fixed to a side surface of the beam 20 of the basic pedestal unit
1. More specifically, bolts B3 of which heads are charged in the
second connecting groove 25 (see FIG. 6) in the basic pedestal unit
1 are inserted into the fixing holes 39b and fastened with nuts N3.
For installation of the additional pedestal unit 2, no machining
process for the beam 20 of the basic pedestal unit 1 is required.
More specifically, as mentioned above, the second connecting groove
25 extends along the longitudinal direction of the beam 20, so that
no new holes for bolts can be formed.
[0130] Next, the additional pedestal frame 30 is vertically
installed on the floor slab S at a side of the pedestal frame 10 or
the intermediate pedestal frame 10'. More specifically, as shown in
FIG. 12, the leveling mechanism 50 is mounted on the leg member 30A
of the additional frame 30 and then the base plate 51 is fixed at a
predetermined position on the floor slab S to the floor slab S with
the anchor bolts 51a driven from the upper side of the base plate
51.
[0131] Subsequently, the upper rib 35, i.e., the upper surface of
the additional pedestal frame 30, is made in contact with the lower
surface of the mounting bracket 39, and adaptively slide against
the mounting bracket 39 to make agreement of the fixing holes 39a
with the fixing holes 35a in the upper rib 35 to insert the bolts
B4 therethrough, that are fastened by the nuts N4.
[0132] As mentioned above, the additional pedestal frame 30 and the
additional beam 40 are installed at the side of the basic pedestal
unit 1 and are fixed using the second connecting groove 25, which
eliminates the necessity of disassembling the basic pedestal unit 1
in the adding process and additional machining process to the basic
pedestal unit 1. In other words, when the basic pedestal unit 1 is
modified to that for a wide heavy unit, the modification can be
carried out although heavy units are mounted on non-modified basic
pedestal unit 1.
[0133] In addition, in this embodiment, the additional pedestal
frame 30 is installed at the side of the pedestal frame 10.
However, the installing position of the additional pedestal frame
30 is not limited thereto. More specifically, the additional
pedestal frame 30 can be installed at the side of the intermediate
pedestal frame 10'.
[0134] Further, in this embodiment, as shown in FIG. 11, at only
one side of the basic pedestal unit 1, the additional pedestal
frame 2 is installed. However, the additional pedestal units 2 can
be installed at both sides of the basic pedestal unit 1. Further,
in this embodiment, the beam 20 is connected to the additional
pedestal frame 30 with the bolts B3 of which heads are charged in
the second connecting groove 25 (see FIG. 6) in the basic pedestal
unit 1. However, the tip of the additional pedestal frame 30 may be
connected to a top portion of the leg member 10A.
[0135] Further, the additional pedestal frame 30 is provided with
the first and second regions in the same manner as the first and
second regions 17 and 18 of the pedestal frame 10, so that the
additional pedestal frame 30 can support one end of one additional
beam 40 and the other end of another additional beam 40 as
similarly shown in FIGS. 7A to 7D.
[0136] Further, the predetermined length of the connecting member
10B corresponds to the span of the arranged beams 20. The leg
member 10A is arranged just under the beam 20. The connecting
member 10B connects upper portions of the leg members 10A. The span
of the extending member 30B extending from the upper portion of the
leg member 30A may correspond to a half of the span of the beams
20. The leg member 10A is reinforced in two perpendicular
directions to its extending direction (vertical direction) with
planer structures including the leg flange 12, the rib 12a, and the
side wall 13, and the connecting member 10B is reinforced in two
perpendicular directions to its extending direction (horizontal
direction) with another planer structures including the connecting
flange 14, the upper rib 15, and the under rib 16 to keep the form
of the bridge shape of the pedestal frame 10 with reduction of
deformation against loads.
* * * * *