U.S. patent application number 10/995673 was filed with the patent office on 2005-11-03 for house access floor system for noise reduction comprising high rigidity sandwich board.
Invention is credited to Kim, Chul-Hwan, Kim, Jun-Yup, Kim, Kwang-Min, Park, Seong-Chan, Park, Sung-Ha.
Application Number | 20050241249 10/995673 |
Document ID | / |
Family ID | 35185626 |
Filed Date | 2005-11-03 |
United States Patent
Application |
20050241249 |
Kind Code |
A1 |
Park, Seong-Chan ; et
al. |
November 3, 2005 |
House access floor system for noise reduction comprising high
rigidity sandwich board
Abstract
An access floors for reducing floor impact sound. The access
floor system includes a plurality of supports disposed at regular
intervals, and upper plates placed on the supports, each of the
upper plates including an upper board, a lower board, and a
quadrangular reinforcing frame disposed between the upper board and
the lower board. By employing the high rigidity sandwich upper
plate, the upper plate can be light and the interval between the
supports can be widened in comparison with the conventional access
floor system, so that the floor impact sound reduction effect is
enhanced. Since sound absorbing material or head insulation
material is inserted between the reinforcing members, the sound
absorption performance or the heat insulation performance can be
enhanced. More particularly, the floor impact sound in apartments
is absorbed so that comfortable environment without noise can be
realized.
Inventors: |
Park, Seong-Chan;
(Cheongju-si, KR) ; Kim, Kwang-Min; (Cheongju-si,
KR) ; Kim, Chul-Hwan; (Daejeon, KR) ; Park,
Sung-Ha; (Cheongju-si, KR) ; Kim, Jun-Yup;
(Cheongju-si, KR) |
Correspondence
Address: |
CANTOR COLBURN, LLP
55 GRIFFIN ROAD SOUTH
BLOOMFIELD
CT
06002
|
Family ID: |
35185626 |
Appl. No.: |
10/995673 |
Filed: |
November 23, 2004 |
Current U.S.
Class: |
52/264 |
Current CPC
Class: |
E04F 15/18 20130101;
E04F 15/206 20130101; E04F 15/02423 20130101 |
Class at
Publication: |
052/264 |
International
Class: |
E04B 001/00; E04B
005/00; E04B 007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 23, 2004 |
KR |
20-2004-0011275 |
Claims
1. An access floor system comprising: a plurality of supports
disposed at regular intervals; and upper plates placed on the
supports, each of the upper plates including an upper board, a
lower board, and a quadrangular reinforcing frame disposed between
the upper board and the lower board.
2. The access floor system as set forth in claim 1, wherein the
reinforcing frame comprises at least one reinforcing member,
disposed at the central portion thereof, for increasing
rigidity.
3. The access floor system as set forth in claim 1, wherein the
upper board, the lower board, and the reinforcing member are made
of single or complex material selected from wood, inorganic
material, synthetic resin, steel, and aluminum.
4. The access floor system as set forth in claim 2, wherein the
reinforcing frame further comprises a sound absorbing material or a
heat insulation material inserted between the reinforcing
members.
5. The access floor system as set forth in claim 4, wherein the
sound absorbing material or the heat insulation material comprises
a synthetic fiber selected from the group of glass wool, rock wool,
and polyethylene terephthalate, or a plastic foam selected from the
group of expanded polystyrene, foamed urethane, and foamed
polyvinyl chloride (PVC).
6. The access floor system as set forth in claim 1, wherein the
thickness of the upper plates ranges from 20 to 70 mm.
7. The access floor system as set forth in claim 1, wherein the
interval between the supports ranges from 600.times.600 mm to
1,200.times.1,800 mm.
8. The access floor system as set forth in claim 2, wherein the
reinforcing member comprises multi-ply wood.
9. The access floor system as set forth in claim 3, wherein the
reinforcing frame further comprises a sound absorbing material or a
heat insulation material inserted between the reinforcing
members.
10. The access floor system as set forth in claim 3, wherein the
reinforcing member comprises multi-ply wood.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to dry-type sound insulation
access floors, and more particularly to dry-type sound insulation
access floors having a high rigidity sandwich board in which time
and cost for installing the access floors are reduced, and floor
impact sound is reduced.
[0003] 2. Description of the Related Art
[0004] In Korea, in order to wire and/or install a conduit system
in the room, such as an office, a computer room, a factory for
electronic Information Technology products, as shown in FIG 1a, a
conventional access floor is basically constructed such that
supports 10' are arranged at regular intervals, and access floor
upper plates 20' are placed on the supports 10', such that spaces
equal to the height and interval of the supports 10 are defined.
Since this access floor must be designed to endure a relatively
heavy load, rigid materials such as steel supports 10' and
inorganic upper plates 20' are used, so that relatively high weight
materials are required, and the interval between the supports 10'
is about 500.times.500 mm, or 600.times.600 mm. Thus, the
installation of the access floor is not efficient and time for
installing the access floor depends on the skill of the
installer.
[0005] Moreover, in Japan, when access floors are installed in
apartments, it is a main object to install lower a conduit system,
and to reduce light floor impact sound. According to the access
floor installed in Japan, heavy floor impact sound as a matter of
concern in Korea is reduced just a little, but may be increased
dependent on the ability of installing the access floor in various
buildings. Further, in order to maximize reduction of the floor
impact sound, non-elastic rubber is used, but the non-elastic
rubber causes fluctuation of the access floor when walking thereon,
so that walkers accustomed to rigid cement/mortar floor feel
uneasiness.
[0006] According to the conventional dry-type sound insulation
access floor used in Japan, as shown in FIG 1b, a plurality of
supports 10" are arranged on a concrete floor at regular intervals,
and a plurality of upper plates 20" are placed on the supports
10".
[0007] The longer the interval between the supports 10" is, i.e.
the less the number of the supports 10" is, the smaller the number
of times for adjusting the level of the floor is, so that the
access floor is rapidly installed and cost for the support 10" is
reduced. However, if the interval between the supports 10" is
increased, the floor is fluctuated and deflected when walking due
to deterioration of rigidity, so that the maximum interval between
the supports 10" in the conventional access floor is 600.times.455
mm.
[0008] Moreover, since the conventional upper plate 20" consists of
unmodified particleboard, it is difficult to reduce the floor
impact sound, and the heavy weight of the upper plates 20"
themselves serve as a large of load to the supports 10".
SUMMARY OF THE INVENTION
[0009] Therefore, the present invention has been made to provide a
noise proof system between floors capable of remarkably reducing
light floor impact sound and heavy floor impact sound and having
excellent proof load performance in view of the above problems, and
it is an object of the present invention to provide a house access
floor system capable of solving the deflection of access floor
members caused by longer intervals between supports while widening
the interval between supports.
[0010] It is the other object of the present invention to provide a
house access floor system of which sound absorption or heat
insulation performance and the fluctuation when walking thereon are
improved so as to allow comfortable environment.
[0011] In accordance with an aspect of the present invention, the
above and other objects can be accomplished by the provision of an
access floor system including a plurality of supports disposed at
regular intervals, and upper plates placed on the supports, each of
the upper plates including an upper board, a lower board, and a
quadrangular reinforcing frame disposed between the upper board and
the lower board.
[0012] The upper board, the lower board, and the reinforcing member
can be made of single or complex material using at least two
materials selected from wood, inorganic material, synthetic resin,
steel, and aluminum, preferably wood, taking into consideration of
the rigidity in comparison with cost and the easiness for
manufacturing. More particularly, the reinforcing member is
multi-ply wood.
[0013] Preferably, the total thickness of each of the upper plates
including the upper board, the lower board, and the reinforcing
member ranges from 20 to 70 mm. If the thickness is too low, the
desired rigidity cannot be obtained, and if the thickness is too
high, the load and material cost of the upper plate itself are
increased.
[0014] According to the preferred embodiment of the present
invention, for the purpose of sound absorption or heat insulation
and high rigidity of the upper plate, sound absorbing material or
heat insulation material can be inserted between the reinforcing
members.
[0015] The sound absorbing material or the heat insulation material
may include a synthetic fiber selected from the group of glass
wool, rock wool, and polyethylene terephthalate, or a plastic foam
selected from the group of expanded polystyrene, foamed urethane,
and foamed polyvinyl chloride (PVC).
[0016] By employing the high rigidity sandwich upper plate in the
present invention, the interval between the supports is to at least
400.times.400 mm, preferably, larger than 600.times.600 mm, more
preferably in the range from 600.times.600 mm to 1,200.times.1,800
mm. The access floor system according to the present invention is
advantageous in that it reduces floor impact sound and can achieve
a light upper plate.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above and other objects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0018] FIG. 1a is a structural view illustrating a conventional
commercial house access floor used in Korea;
[0019] FIG. 1b is a structural view illustrating a conventional
house access floor used in Japan;
[0020] FIG. 2 is a structural view illustrating an access floor
according to the present invention;
[0021] FIG. 3 is a cross-sectional view and a partially exploded
plan view illustrating an upper plate according to a preferred
embodiment of the present invention;
[0022] FIG. 4 is a cross-sectional view and a partially exploded
plan view illustrating an upper plate according to another
preferred embodiment of the present invention;
[0023] FIG. 5 is a reference view illustrating a method for
measuring the deflection of the upper plate; and
[0024] FIG. 6 is a graph comparing performance for reducing heavy
floor impact sound of a conventional office upper panel, a
conventional house upper panel, and a high rigidity upper panel
according to the present invention, which are employed in the
access floor.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] Hereinafter, a house access floor system according to the
present invention will be described in detail with reference to the
accompanying drawings.
[0026] FIG. 2 shows a house access floor system according to the
present invention, which includes a plurality of supports 10
arranged at regular intervals and a plurality of upper plates 20
placed on the supports 10.
[0027] In the present invention, high rigidity sandwich upper
plates are used as the upper plates 20 and may be arranged in
intervals between the supports more than at least 400.times.400 mm,
for example, 600.times.600 mm, 900.times.900 mm, 800.times.1,200
mm, 1,200.times.1,200 mm, or 1,200.times.1,800 mm. Consequently,
time for installing the house access floor is shortened and cost
can be reduced due to the reduced number of the supports 10.
[0028] FIG. 3 shows a cross-sectional view and a partially exploded
plan view of the upper plate 20 according to the preferred
embodiment of the present. As shown in FIG. 3, the upper plate 10
includes an upper board 21, a lower board 22, and a reinforcing
frame 23 disposed between the upper board 21 and the lower board
22. The reinforcing frame 23 has a quadrangular frame shape
corresponding to the rims of the upper board 21 and the lower board
22, and includes at least one reinforcing member, which is disposed
in a central axis thereof and secures the high rigidity of the
reinforcing frame 23.
[0029] FIG. 4 shows a cross-sectional view and a partially exploded
plan view of an upper plate 20 according to another preferred
embodiment of the present invention. The upper plate 20 includes an
upper board 21, a lower board 22, a reinforcing frame 23, and a
core 24 disposed between reinforcing members. The core 24 is made
of sound absorbing and insulating material such as glass wool,
expandable polystyrene (EPS), or the like, so as to provide the
absorb sound and insulation effect.
[0030] The support 10 adopted in the present invention is roughly
divided into a head, a height adjusting bolt, and a supporting
rubber. More concretely the support 10 includes a plate-shaped head
having a nut inserted into a central portion thereof to support the
upper plate, a bolt being formed with a slotted recess or
cross-shaped recess and associated with the nut so as to adjust the
height of the head, and a supporting rubber having a bolt
supporting recess for rotatably supporting the bolt formed at the
upper portion thereof.
[0031] Preferably, in order to absorb impact transferred to the
floor and to reduce vibration transfer, non-elastic rubber is used
as the supporting rubber. The shape of the supporting rubber may be
selected from among a cylindrical shape advantageous against load,
a reverse trapezoidal shape providing stability, and an embossed
structure for obtaining floor impact sound reduction
performance.
[0032] An upper plate, having a thickness of 40 mm, and the
structure as shown in FIG. 4, is manufactured using particleboard
as the upper plate 21 and the lower plate 22, ply wood as the
reinforcing member 23, and expanded polystyrene as the core 24, and
the deflection of the upper plate is measured. The measured
deflections are listed in Table 1. As listed in Table 1, the house
access floor according to the preferred embodiment of the present
invention is superior to comparative examples 1 and 2 adopting the
conventional upper plate, i.e. the deflection of the upper plate
according to the preferred embodiment of the present is
approximately 4 mm less than the deflections of the comparative
examples 1 and 2. The deflection, as shown in FIG. 5, has been
measured in such manner that a load of 100 kg is applied to the
central portion of an upper surface of the upper plate having a
pressing area with a diameter .phi.80 and scales of a gauge
installed bellow the upper plate are read.
1 TABLE 1 Item Deflection (mm) Comparative example 1 6.82
Comparative example 2 7.72 Present invention 2.85 Comparative
example 1: house access floor system of Japanese Corporation A
Comparative example 2: house access floor system of Japanese
Corporation B Present invention: house access floor system adopting
high rigidity upper plate according to the preferred embodiment of
the present invention
[0033] Moreover, by employing the high rigidity upper plate 20, the
interval between the supports 10 can be widened to 800.times.1,200
mm, and the floor impact sound can be satisfactorily reduced.
[0034] FIG. 6 and Table 2 show impact sound reducing performance of
the upper plate (the preferred embodiment) according to the present
invention constructed as described above compared with the
conventional house access floor employing the conventional supports
and upper plates as shown in FIGS. 1a (Comparative example 1) and
1b (Comparative example 2). As shown in FIG. 6 and Table 2, it can
be confirmed that the impact sound reduction of the house access
floor according to the present invention employing the high
rigidity upper plates is 6 dB (A) to 11 dB (A) greater than those
of the comparison examples 3 and 4 employing the conventional upper
plates. The floor impact reducing performance test has been carried
out according to KS F 2810-2, and the result thereof is estimated
and compared according to KS F 2863-2. Described in detail, the
upper plates are installed in an acoustics laboratory and the floor
impact sound is generated by applying a heavy impact source, and
then the generated sound is received in a sound receiving room via
a microphone so as to be analyzed and estimated.
2 TABLE 2 Hz materials 63 125 250 500 dB(A) Comparative 71.5 73.1
65.8 43.9 56 example 3 Comparative 79.6 63.1 58.0 44.9 51 example 4
Present 70.7 63.2 47.2 38.2 45 invention Comparative example 3:
office access floor system used in Korea (FIG. 1a) Comparative
example 4: house access floor system used in Japan. (FIG. 1b)
Embodiment: access floor employing the high rigidity upper plates
according to the present invention (FIG. 2)
[0035] As described above, according to the present invention, the
light weight of the upper plate can be achieved by employing the
high rigidity sandwich upper plate, the interval between the
supports wider than that of the conventional access floor system
allows rapid installation of the access floor and cost reduction.
Moreover, reduction of the floor impact sound is achieved, and the
insertion of the sound absorption material and the heat insulation
material between the reinforcing members disposed at the upper
plate enhances sound absorption and heat insulation.
[0036] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying
claims.
* * * * *