U.S. patent number 3,601,942 [Application Number 04/797,136] was granted by the patent office on 1971-08-31 for building wall construction.
Invention is credited to James D. Wilson.
United States Patent |
3,601,942 |
Wilson |
August 31, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
BUILDING WALL CONSTRUCTION
Abstract
A building wall construction for one story or multiple story
buildings where large wall units are delivered to the building site
with their exterior surfaces completely finished, and the units are
ready to be assembled together with bolted or similar connections
only and are connected together to form a structure capable of
accepting loads along its entire length. The wall system utilizes
large metal L-shaped extrusions, plurally adjacent, having an
exterior with a permanent finish applied. One leg of the extrusion
provides the exterior wall surface terminating in an inset tongue
and the other leg extends inwardly from the exterior wall and
provides a socket or recess to receive the tongue of an adjacent
wall unit. The other leg also is provided with vertical passages
receiving elongated rods or bolts to tie the wall units to head and
sill members.
Inventors: |
Wilson; James D. (Wilmette,
IL) |
Family
ID: |
25170009 |
Appl.
No.: |
04/797,136 |
Filed: |
February 6, 1969 |
Current U.S.
Class: |
52/300; 52/283;
52/316; 52/293.3 |
Current CPC
Class: |
E04B
1/18 (20130101); E04B 2/60 (20130101) |
Current International
Class: |
E04B
1/18 (20060101); E04B 2/58 (20060101); E04B
2/60 (20060101); E04b 002/18 (); E04c 002/08 () |
Field of
Search: |
;52/293,300,585,542,593,483,585,579,235,588,305,311,630,283,316 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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162,324 |
|
1949 |
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OE |
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645,852 |
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1950 |
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GB |
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795,737 |
|
1958 |
|
GB |
|
Primary Examiner: Murtagh; John E.
Claims
Having thus disclosed my invention, I claim:
1. A building wall structure for a load-bearing wall, comprising a
plurality of vertically disposed elongated wall panels joined
together to form a wall structure, each panel having a generally
L-shape in horizontal cross section with a first leg forming the
exterior surface of the wall and an instanding leg generally
perpendicular to the first let, said first leg terminating at its
edge opposite the instanding leg in an inwardly offset tongue, said
instanding leg having a recess inwardly offset to receive the
tongue of an adjoining panel, vertically extending channels formed
in said instanding leg, a cover member for the upper edges of the
panels including at least one elongated angle member, and bolts
extending through said cover member and threadingly engaging the
channels in the wall panels.
2. A building wall structure for a load-bearing wall, comprising a
plurality of vertically disposed elongated wall panels joined
together to form a wall structure each panel having a generally
L-shape in horizontal cross section with a first leg forming the
exterior surface of the wall and an instanding leg generally
perpendicular to the first leg, said first leg terminating at its
edge opposite the instanding leg in an inwardly offset tongue, said
instanding leg having a recess inwardly offset to receive the
tongue of an adjoining panel, and a support for a floor-ceiling
intermediate the ends of the panels; said support including an
angle member extending horizontally along the edges of the
instanding legs of the wall panels to support joists for the
floor-ceiling a pair of joist support arms secured to said angle
member and to the instanding legs of adjacent wall panels, said
support arms each having a web portion with a vertically disposed
channel therein, a bolt extending through said angle member and the
channel to secure the angle member to the support arm, the opposite
end of the web generally conforming to the profile of the
instanding leg of a wall panel, an elongated bolt extending through
a pair of support arms and the instanding panel legs to secure the
support arms to the wall panels, and a spacing sleeve encompassing
the last mentioned bolt and extending between the legs of the wall
panels.
3. A building wall structure for a load-bearing wall, comprising a
plurality of vertical disposed wall panels joined together by
interleaved edges thereof, each panel having a first leg forming
the exterior surface of the wall and at least one instanding leg,
at least one vertically extending channel formed in said instanding
leg, a head member for the upper edges of said panels, and a sill
member supporting the lower edges of said panels, an elongated rod
located within and continuously supported laterally by each channel
and extending through said head member and said sill member, and
fastening means engaging each end of each rod above said head
member and below said sill member.
4. A building wall structure as set forth in claim 3, in which said
load-bearing wall is intermittently supported, whereby both
horizontal and vertical shear are transmitted through said rods,
said wall panels, and said head and sill members to the
intermittent supports for the wall, wherein the assembled wall
functions as a beam and truss between the intermittent
supports.
5. A building wall structure for a load-bearing wall, comprising a
vertically disposed elongated wall panel having a first leg forming
the exterior surface of the wall and an instanding second leg
generally perpendicular to the first leg, said panel having a
recess inwardly offset from one edge of said first leg, said first
leg terminating at its edge opposite said one edge in an inwardly
offset tongue received in the recess of the next adjacent panel,
said panel being formed from extruded aluminum and having a
vertically extending random naturalistic texture imparted to the
surfaces thereof resulting from the extrusion of the panel in an
indeterminate length and, in horizontal section, the first leg is
convoluted inwardly and outwardly from a vertical plane of the wall
to increase the rigidity of the wall panel.
6. A building wall structure as set forth in claim 5, in which the
horizontal section of said first leg is wholly identical throughout
the vertical dimension of the leg, said random naturalistic texture
being deliberately shaped to provide a nonrepetitive, nonmechanical
and consequently esthetically pleasing exterior visible
surface.
7. A building wall structure as set forth in claim 5, in which said
instanding leg includes at least one vertically extending channel
formed therein, and an elongated and conformably received within
said channel and extending beyond the upper and lower edges of the
panel.
8. A building wall structure for a load-bearing wall, comprising a
vertically disposed elongated wall panel having a first leg forming
the exterior surface of the wall and an instanding second leg
generally perpendicular to the first leg, said panel having a
recess inwardly offset from one edge of said first leg, said first
leg terminating at its edge opposite said one edge in an inwardly
offset tongue received in the recess of the next adjacent panel,
said tongue and recess having a plurality of vertically spaced
aligned openings therein, and a shear transfer pin inserted in each
set of aligned openings, so that continuous shear transfer is
obtained across the minor axis of the resulting column due to the
interleaving of the tongue and recess parallel to the minor axis,
and intermittent shear transfer is obtained both longitudinally and
across the major axis due to the shearpins, said first leg having a
vertically extending random naturalistic texture imparted to the
surfaces thereof and, in horizontal section, is convoluted inwardly
and outwardly from a vertical plane of the wall to increase the
rigidity of the wall panel.
9. A building wall structure for a load-bearing wall, comprising a
vertically disposed elongated wall panel having a first leg forming
the exterior surface of the wall and an instanding second leg
generally perpendicular to the first leg, said panel having a
recess inwardly offset from one edge of said first leg, said first
leg terminating at its edge opposite side one edge in an inwardly
offset tongue received in the recess of the next adjacent panel,
said instanding leg including a vertically extending channel
adjacent said first leg, a web portion extending from the recess
and terminating in a second vertically extending channel, and a
pair of elongated rods conformably received within said channels
and extending beyond the opposite edges of the panel said first leg
having a vertically extending random naturalistic texture imparted
to the surfaces thereof and, in horizontal section, is convoluted
inwardly and outwardly from a vertical plane of the wall to
increase the rigidity of the wall panel.
10. A building wall structure as set forth in claim 9, in which
said channels are generally C-shaped in horizontal cross
section.
11. A building wall structure as set forth in claim 9, including an
intermittently supporting foundation for the wall structure, an
elongated sill supported by the foundation, a plurality of wall
panels joined together resting on said sill, and a cover member for
the upper edges of the panels including at least one elongated
angle member, said elongated rods extending through said sill and
said cover member, and fastening means cooperating with said rods
retaining the cover member, sill and panels together.
12. A building wall structure as set forth in claim 11, in which
said sill and cover member act as tension and compression chords,
respectively, and positive shear transfer is provided through said
elongated rods to said sill and cover member.
13. A building wall structure for a load-bearing wall, comprising a
vertically disposed elongated wall panel having a first leg forming
the exterior surface of the wall and an instanding second leg
generally perpendicular to the first leg, said panel having a
recess inwardly offset from one edge of said first leg, said first
leg terminating at its edge opposite said one edge in an inwardly
offset tongue received in the recess of the next adjacent panel, an
instanding leg of a wall panel terminating in a channel receiving
an edge of an interior wall surface, a shoulder intermediate the
ends of the leg, a sealing strip engaging said shoulder, a window
having an edge engaging the sealing strip, and a snap-in member
engaging the instanding leg and the sealing strip to retain the
window in operative position, said first leg having a vertically
extending random naturalistic texture imparted to the surfaces
thereof and, in horizontal section, is convoluted inwardly and
outwardly from a vertical plane of the wall to increase the
rigidity of the wall panel.
Description
The present invention relates to a novel building wall construction
and more particularly to a building formed of large wall units
which can be fabricated in the shop and transported to the
construction site for immediate assembly.
The continuous and increasing rate of onsite construction labor is
seriously affecting the construction industry as productivity is
not increasing at close to the same rate. One possible solution to
this problem of reducing overall construction costs is a
considerable increase in the use of shop-fabricated building
components. The present invention makes use of the lower labor cost
of shop fabrication in supplying large building components for
field assembly utilizing devices for the wall structure of the
building.
A detracting factor found in previous shop-fabricated component
metal elements is a strongly mechanistic, identically repetitive
surface appearance resulting from the necessary use of high rate
production rolling equipment in the forming of the material. The
resultant industrial appearance of the surface militates against
the acceptance and use of such materials in nonindustrial
buildings, such as schools and homes.
The present invention provides a building wall panel having a
surface that is nonmechanistic and of a natural, nonrepetitive
character that is in keeping with the textures resulting from the
use of masonry materials, and is, as a result, readily acceptable
in nonindustrial buildings. By means of a deliberately designed
surface, convoluted in a deliberately natural random manner, an
appearance is provided that, while within the desirable texture
idiom of masonry-type materials, is itself a unique expression of
the nature of extruded metals.
The convolutions themselves contribute mechanically to the load
capacity of the wall by providing significant additional stiffness
to the wall panels. The result is that the very considerable
economic advantages of long building components being produced in a
highly automated industrialized manner, as compared to conventional
onsite hand assembly of small components, can be utilized to
produce a very efficient bearing wall that is uniquely acceptable
within the esthetic demands of humanistic building design.
Among the objects of the present invention is the provision of a
building wall construction which may be used for a single story or
multiple story type building. The building is constructed of
shop-fabricated large wall units that are transported to the
construction site for substantially immediate assembly.
Another object of the present invention is the provision of a
building wall construction utilizing a load-bearing wall system
formed of a series of large metal L-shaped extrusions of a suitable
width and a height of approximately the height of the building,
which extrusions are completely finished on the exterior surface
forming one leg of the L-shaped extrusion. This leg terminates at
its free end in an inset slightly enlarged edge or tongue which is
received in a complementary recess formed in the other leg of an
adjoining L-shaped extrusion. The other leg of the extrusion
extends inwardly to terminate at the inner building wall and
provides a recess or socket spaced inwardly from the exterior wall
surface to receive the end or tongue of the adjoining wall unit.
The inwardly extending leg of the extrusion forms with the
adjoining extrusion a load-bearing T-shaped column with the
inwardly extending leg providing the necessary bracing to the
extrusion at the joining of the two adjacent elements.
A further object of the present invention is the provision of a
building wall construction having a solid load-bearing wall into
which fenestration can be easily inserted.
The present invention also comprehends the provision of a
load-bearing wall system where the insulation to the degree
required is accommodated within the wall and the interior finish
surface can be either shop applied or field applied.
The present invention further comprehends the provision of a
load-bearing wall system where wall segments can be utilized as
raceways for electrical wiring, as pipe chases for plumbing runs,
and as ducts for air movement in heating and cooling.
Another object of the present invention is the provision of a
building wall structure that is readily designed to be demountable
for transfer to another site and subsequent reerection as needs
change.
Another object of the resent invention is the provision of a
building wall construction having a load-bearing wall which will
support at its upper edge any suitable type of roof construction;
the roof structure preferably being shop assembled into
prefabricated sections that can be immediately assembled at the
construction site.
A further object of the present invention is the provision of a
building wall construction having a bimetallic thermal movement
restraint to inhibit the effects of thermal expansion or
contraction of the metal extrusions forming the building. The
building elements are preferably formed of aluminum and a metal
with a lower coefficient of expansion is included to be fastened at
its ends to the aluminum elements to restrain the aluminum
expansion.
Further objects are to provide a construction of maximum
simplicity, efficiency, economy and ease of assembly, and such
further object, advantages and capabilities as will later more
fully appear and are inherently possessed thereby.
In the drawings:
FIG. 1 is a partial front elevational view of a building utilizing
the construction elements of the present invention.
FIG. 2 is an enlarged horizontal cross-sectional view of the wall
construction of the building taken on the line 2--2 of FIG. 1.
FIG. 3 is an exploded perspective view of a plate member of the
wall construction showing the method of assembly.
FIG. 4 is a perspective view of a building partially broken away to
show the construction thereof.
FIG. 5 is a partial vertical cross-sectional view of one form of
building construction.
FIG. 6 is a horizontal cross-sectional view taken on the line 6--6
of FIG. 5.
Referring more particularly to the disclosure in the drawings
wherein is shown an illustrative embodiment of the present
invention FIG. 1 discloses a building 10 having a roof 11 and walls
12 secured to a base or floor 13 and formed of a series of extruded
panels or plate members 14 joined together to form the wall and
having windows 15 mounted therein. As seen in FIGS. 2 and 3, each
plate member 14, preferably formed of extruded aluminum, is of a
generally L-shape with the longer leg 16 forming the exterior wall
surface and which can be prefinished of any suitable or desired
exterior configuration as at 17 prior to shipment to the
construction site.
As the construction industry is experiencing a continuous and
increasing rate of increase of onsite construction labor without a
corresponding increase in productivity the present wall
construction using prefinished ready to assemble plate members will
aid in reducing overall construction costs. The size of the
assembled panels is determined by the maximum size of such panels
that can be shipped by available means to the job site. A single
panel 14 may have a width of 1 foot, but several panels will be
assembled together for delivery as a unit to the job site.
Generally speaking, this size will be in the order of 8 by 20 feet
panel unites intended for use in a two story building, and 9 by 40
for panel units intended for use in a one story building. These
sizers are illustrative only and are not meant to be limiting.
The panel leg 16 terminates at its free end in an offset portion 18
and an enlarged edge portion or tongue 19 parallel to the leg 16.
The other leg 21 of the panel 14 includes an inwardly extending
irregular leg having an inwardly offset recess 22 adapted to
receive the tongue 19 of an adjoining panel 14 as seen in FIG. 2. A
resilient sealing strip 23 is positioned between the offset portion
18 adjacent the tongue 19 of one panel and the leg 21 of the other
panel adjacent the exterior leg 16. Between the recess 22 and the
leg 16, the leg 21 forms a generally C-shaped channel 24 and the
web 25 from the recess 22 terminates in an inner channel 26 and a
pair of flanges 27, 27 to position the interior wall panel or
surface 28.
As seen in FIG. 2 the adjoining panels 14, 14 having the inwardly
extending leg 21 and the exterior legs 16, 16 form a generally
T-shaped column with the inward leg 21 providing the necessary
bracing to the panels at the joining of the panels. The adjacent
panels constitute a continuous series of columns with the adjacent
panels interleaved in a plane parallel to the plane of the wall.
Shear loads are transferred in a continuous positive manner across
the minor axis of the column system, i.e. perpendicular to the
plane of the wall. Shear loads in the plane parallel to the plane
of the wall are transferred across mating panels by means of
shearpins 29 (FIGS. 2 and 3) extending through an opening 31 into
the recess 22 and through an opening 32 in the tongue 19 therein.
Positive, but discontinuous shear transfer is thus accomplished
across the effective major axis of the column system. Longitudinal
shear transfer is also accomplished by the shear transfer pins 29
which are vertically spaced along the length of the panels.
Now considering FIG. 2, the panels 14 form the walls of a building
for any desired length. A square tubular column 33 is located at
the corner of the building and cooperates with a pair of corner
members 34, 35; the member 34 being of generally rectangular shape
and having an inward web 36 defining an inwardly offset recess 37
receiving the tongue 19 of the adjacent panel 14 and a generally
C-shaped channel 38. The member has a web 39 generally parallel to
the legs 16 of the panels 14 and a web 41 perpendicular thereto and
providing a recess 42 adapted to receive a corner of the column 33.
The web 41 terminates in a U-shaped channel 43 adapted to receive
an edge of an interior wall panel 28 with the one leg of the
channel providing a generally C-shaped channel 44 opposite the
channel 38 with a flange 45. The wall panel 28 is secured by a
suitable adhesive onto strips 46 of an adhesive backed cellular
neoprene or similar material which adheres to the flanges 27, 27 of
the legs 21 and the flange 45.
The corner member 35 is also generally rectangular having a web 47
with a U-shaped channel 48 to receive the edge of another panel 28
of a second wall. The web 47 has a recess 49 for an opposite corner
of the column 33, and a web (not shown) perpendicular to the web 47
which terminates in an inwardly offset tongue, identical to the
tongue 19, received in a recess 22 of the first panel 14 of the
second wall (not shown).
To provide for windows or other fenestration, another panel 14 is
utilized with the instanding leg 51 having the channels 24 and 26,
a recess 52 receiving a glass gasket of neoprene or other suitable
material having a channel shape to receive the edge of a glass
panel 54, forming a window 15; a snap-in member 55 engaging the leg
51 to retain the glass panel 54 and gasket 53 in operative
position. At the opposite edge of the glass panel 54 (not shown) a
similar panel 14 has an instanding leg similarly adapted to define
the opposite edge of the opening for the window 15. The leg 51
terminates in a U-shaped channel 56 to receive an edge of the
interior wall panel 28.
As shown, any required amount and type of insulation 57 is located
within the panels 14, 14 and the interior wall panels 28 may be
formed of plasterboard, chalkboard, or other suitable material may
be used. A fire-resistant wall panel 28 formed of plasterboard
gypsum board or other cementitious material, will enhance the
fire-resistant properties of the wall structure. The interior wall
panels 28 may be applied to the panels 14 in the shop or in the
field as desired.
With reference to FIGS. 4 and 5, the wall structure shown in FIGS.
2 and 3 may be used in several types of building structures. FIGS.
4 and 5 disclose the general construction of the building 10 shown
in FIG. 1 having a concrete foundation post 58 with a precast sill
course 59 thereon. A concrete floor 61 has bent reinforcing rods or
bars 62 secured, as by welding to an inverted U-shaped channel 63
running the length of the wall on the sill course 59. An extruded
sill 64, preferably of aluminum rests on the channel 63 and has an
exterior downwardly extending lip 65 and a pair of spaced flanges
66, 66 adjacent the inner edge of the sill. The wall panels 14, 14
rest on the sill 64 and elongated rods 67 and/or bolts 68 extend
through openings in the channels 63 and the sill 64 into the
C-shaped channels 24, 26 in the panels 14 and the channels 38, 44
in the members 34.
In the wall unit, a combination of both bolts and tie rods are
utilized. The bolts 68 are of the self-tapping type having an
enlarged head 69 received in the space of the channel 63 and a
threaded shank 71 which forms threads in the channels 24, 26 or 38,
44 to secure the wall panels 14 to the sill. The tie rods 67 have
threaded ends extending through the sill plate 64 and the channel
63 and through the upper members 73, 75, and nuts 72 engage the
threaded ends to secure the structure together.
As shown in FIGS. 4 and 5, the upper edges of the panels 14 have an
elongated flat member 73 extending along the length of the wall and
topped by an inverted U-shaped cover 74 formed of a pair of
extruded aluminum angle members 75, 75 to retain the wall together
and to distribute vertical loads on the wall. Upper bolts 68 or the
upper threaded ends of tie rods 67 extend through the angle members
75, 75 and the flat member 73 into the C-shaped channels; the
enlarged heads 69 of bolts 68 or the nuts 72 being located above
members 75, 75. The flat member 73 is preferably formed of steel
for a purpose to be later described. Incident vertical loads are
distributed over several wall panels 14 at and adjacent to the
point of load application by means of the continuous horizontal
plate 73 and the continuous horizontal angle members 75, 75 which
encompass the upper ends of the wall panels 14 including the leg 16
and the instanding leg 21, as clearly seen in FIG. 5.
The load carrying capacity of the wall panel 14 is considerably
increased over that of a simple unbraced plane due to the random
convolutions 17 forming the exterior appearance of the panel. The
convolutions extend across the width of the panel and extend
vertically with an identical cross section the length of the
extrusion. The convolution 17 is subject to wide variation as the
esthetic and architectural purposes require. The purpose of the
convolutions are primarily twofold: (1) an architectural purpose in
providing a naturalistic random vertical texture designed to
provide a nonmechanical appearance and an attractive esthetically
desirable exterior surface for the building and (2) the
convolutions serve to provide substantial stiffening and bracing to
the plate element or leg 16 forming the exterior plane of the
wall.
The concrete floor 61 of conventional formation rests at its edges
on the sill course 59 and the inner edge of the sill 64. The
central portion of the floor rests on dirt fill 76. A permanent
insulation block 77 is located at the edge of the floor 61 and
rests in the channel formed by the spaced flanges 66, 66 of the
sill 64. The interior wall panels 28 are supported on the
insulation block 77 and extend upward to a point short of the first
floor ceiling or a roof structure for a one story building. A
conventional flooring 78 of wood, tile, etc. can be laid on the
concrete floor surface 61.
As shown in FIGS. 5 and 6, the wall panels 14, 14 are capable of
supporting a ceiling-floor assembly 79 for a two story building.
The second story floor base 81 may be of any suitable material such
as concrete formed in slabs and supported by parallel floor joists
82 extending between the opposite wall panels 14, 14 of the
building. The joists 82 rest on the horizontal flange 84 of an
angle member 83 having a vertical flange 85 engaging the flanges 27
27 of the legs 21. The angle member 83 is supported by a series of
spaced joist supporting arms 86 and bolted thereto by elongated
bolts 87 and nuts 88 with the bolt extending through a general
C-shaped channel 89 (FIG. 6) formed in the arm 86.
The supporting arm 86, as more clearly seen in FIG. 6, has a
straight web portion 91 containing the C-shaped channel 89 and
terminating in a perpendicular flange 92. An offset irregularly
shaped web portion 94 joined to the web portion 91 by the offset 93
is conformably received on the surface of the instanding leg 21 of
a panel 14. The bearings 86 are located on each side of the floor
joist 82 and secured to adjacent legs 21, 21 by elongated bolts 95
and cooperating nuts 96 extending through openings 97 in the legs
21 and the web portion 94. A tubular spacer sleeve 98 encompasses
the bolt 95 and extends between the adjacent surfaces of the legs
21, 21.
A ceiling 99 may be suspended from or otherwise secured to the
floor joists 82 as is conventionally known. Also, a conventional
floor 100 formed of wood, tile or other suitable material may be
employed on top of the floor base 81. Also, any suitable roof
construction may be utilized with the wall construction, the
roofing being supported on the horizontal angle members 75, 75.
In construction, the foundation and sill are first properly located
and then the wall panel units are erected in opposite pairs and
bolted to the sill and channel. After several wall units are
erected, the erection of roofing units or segments is started.
Cranes are utilized to handle the units in erection. By means of
this system, onsite construction labor is reduced nearly 90
percent.
Expansion is always a serious problem in metals, and is
particularly serious in aluminum due to the relatively high rate of
thermal expansion inherent in the metal. As the extruded wall
panels 14 as well as many of the beams are preferably formed of
aluminum, the particular configuration of the panels is important
in reducing the serious problems of thermal expansion in the
building structure. Horizontal expansion of the wall panels is
accommodated by elastic deflection of the instanding legs 21
occurring at the joining of two adjacent panels. These two panels,
extending in a parallel manner, from the exterior surface 17 inward
to the point of connection of the two adjacent extrusions, deflect
laterally as the plate or leg 16 constituting the exterior wall
plane moves thermally. By this means, thermal movement is not
accumulated, but is accommodated within the separate extruded
elements.
Furthermore, resistance to buckling by either the loading at the
upper edge of the wall or thermal expansion is achieved by the
oppositely extending flanges 27, 27 at the inner edge of the
instanding leg 21. Also, the interleaving of the tongue of one
panel in the recess of the next adjacent panel provides resistance
to buckling for the first leg, providing the exterior panel
surface, in a direction perpendicular to the plane of the first
leg. The resulting structural column formed by the interleaved
panels provides a geometry to impart a significant moment of
inertia about the minor axis of the column.
To further reduce the effects of thermal expansion of the aluminum
structural units, over the range of ambient temperatures normally
encountered, to acceptable limits, this invention involves the
inclusion of a metal with a lower coefficient of expansion, such as
steel, fastened at its ends to the aluminum elements; so that under
ambient temperatures the aluminum expansion is restrained by the
lesser expansion of the steel. The steel generally in the form of
an elongated rod having threaded ends, is accommodated within an
aluminum extrusion by means of a hollow or partially closed hollow
space, of the proper dimension or diameter, extending
longitudinally within the aluminum extrusion. Threaded fastening is
provided at the ends so that aluminum expansion is restrained by
the steel, but aluminum contraction is unrestrained. If contraction
is also to be restrained, sufficient tension is placed on the steel
rod to deform the aluminum longitudinally to the length established
for the lower end of the ambient range.
As shown, the steel rods 67 extending through the channels 24, 26
in the wall panels 14, 14 may be utilized to restrain the expansion
of the aluminum in a vertical direction. The extruding of the
hollow channel or conduit means in a wall panel 14 and the
subsequent placing of a steel rod therein does not subtract from
the geometrical section properties of the extruded element, but
rather adds to the effective properties with a resulting final
assembly that is stronger and will resist a greater load.
In addition, the longitudinally extending inverted channel 63 and
the elongated flat member 73 within the cover 74 are also formed of
steel for the purpose of restraining thermal expansion along the
length of the building wall. The elongated rods 67 and the bolts 68
which are received in the channels 24, 26 also extend through both
the channel 63 and the elongated member 73 so as to secure the wall
panels 14, 14 to the channel 63 and the member 73 for the purpose
of restraint of thermal expansion of the aluminum panels in a
direction parallel to the plane of the interleaved first legs 16,
16.
Although a wall panel for a building construction of a particular
configuration has been shown and described, it is not my desire or
intent to unnecessarily limit the scope or the utility of the
improved features by virtue of this illustrative embodiment.
* * * * *