CA1062870A - Load supporting structure and a truss for use therein - Google Patents
Load supporting structure and a truss for use thereinInfo
- Publication number
- CA1062870A CA1062870A CA258,556A CA258556A CA1062870A CA 1062870 A CA1062870 A CA 1062870A CA 258556 A CA258556 A CA 258556A CA 1062870 A CA1062870 A CA 1062870A
- Authority
- CA
- Canada
- Prior art keywords
- beams
- truss
- trusses
- bridging
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/14—Load-carrying floor structures formed substantially of prefabricated units with beams or girders laid in two directions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/16—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A load sharing structure of timber trusses and bridging beams is arranged such that both the top and the bottom faces of the bridging beams are in a face-to-face engagement with the respective parts of the trusses through which the beams pass.
A timber truss for use in the structure comprises an upper chord, a lower chord and a zig-zag arranged web members there-between. The web section of the truss further includes generally vertical reinforcement beams, each of the beams being provided at one side thereof with ledge means for supporting a bridging beam of a load supporting structure of the type of a roof or floor structure of a building or the like. The ledges in the vertical beams, together with bridging members, increase the resistance of the overall structure against vertical components of the load. The system has a slightly higher factor of safety than normal trusses of the type.
A load sharing structure of timber trusses and bridging beams is arranged such that both the top and the bottom faces of the bridging beams are in a face-to-face engagement with the respective parts of the trusses through which the beams pass.
A timber truss for use in the structure comprises an upper chord, a lower chord and a zig-zag arranged web members there-between. The web section of the truss further includes generally vertical reinforcement beams, each of the beams being provided at one side thereof with ledge means for supporting a bridging beam of a load supporting structure of the type of a roof or floor structure of a building or the like. The ledges in the vertical beams, together with bridging members, increase the resistance of the overall structure against vertical components of the load. The system has a slightly higher factor of safety than normal trusses of the type.
Description
The present invention relates to a truss made of timber beams of the type having top chord a bottom chord and a zig-zag web section comprising a plurality of timber beams, particularly for use in the building industry.
Load supporting structures comprising a plurality of trusses made of timber beams are well known in the art. Generally, they consist of top chord, a bottom chord and a zig-zag struc-ture of web beams fixedly secured to the chords. The trusses further comprise generally vertical reinforcement beams extending between the upper and the lower chord. ~en a load supporting structure is assembled, the trusses are aligned parallel with each other and mutually connected by bridging members fixedly se-cured to appropriate parts of the trusses.
The bridging beams are normally nailed to the respec-tive portions of the trusses to provide the desired stability of the overall structure in the direction generally horizontal and normal to the elongation of the trusses.
One of the requirements of load supporting structures of the above type is that the structures be protected against "progressive collapse"~ In tfi~ pro~r~ss~Ye collaps~ of a structure sucE as a roof ~tructure whl'c~ does not ~ave ade-quate load s~arlng the load of a failed truss will be quite suddenly transferred to the adjacent trusses through the roof decking which is relatively light and will sag suddenly until it reaches a point where the decking must fail allowing the load to fall between the adjacent trusses. If the decking does not actually tear or break the load will be transferred to the adjacent trusses with an impact. Since an impact on a structure which is already heavily loaded is very severe it is quite likely that the adiacent trusses will also fail unless they have an extremely great safety factor. In other words ~f one of the trusses fails at its load, then the load no longer carried by the failed truss must be completely transferred to the remaining trusses, otherwise the trusses adjacent to the failed 1 - ~F
~0628~o one may further collapse due to an increased load caused by the failure of the former truss.
Most of the known load supporting structures of the above type do not achieve such load sharing at all. Some of the known structures achieve the load sharing by having e.g. roof decking of sufficient strength to transfer the loads. Another known means of load sharing is through a combination of decking and bridging. As the bridging beams are normally nailed to the re-spective portions of the trusses, they are not capable of reliable transfer of the load from the failed truss towardsthe rest of the structure, unless a great number of nails is used, which is impractical. The use of relatively strong roof decking, on the other hand, results in increased costs.
It is an object of t~e pre~ent ~nYent~on ta pxoYide - - an improved load supporting structure, of t~e above type ~fil-c~
would have an improved resistance to the progressive collapse.
It is a further object of the present invention to provide a truss made of timber beams which would be capable of a complete transfer of load from a failed truss to the remaining portions of the structure by use of regular timber beam bridg-ing members nailed to appropriate portions of a truss, without the need for a great and impractical number of nails at the joinders between each of the bridging beams and the respective trusses.
The load supporting structure according to the present invention includes a plurality of elongated timber trusses arranged in an aligned relationship. Each truss has an upper chord vertically spaced from a bottom chord and web section members spanning the chords generally in a zig-zag fashion.
The structure furt~er includes a plurality of timber bridging beams of an upwardly elongated cross-section, preferably of a rectangular cross-s~ct~on~ ~h~r~hy~e~ch ~eam ha~ a.top face, a bottom face and two side faces. The bridging beams pass through
Load supporting structures comprising a plurality of trusses made of timber beams are well known in the art. Generally, they consist of top chord, a bottom chord and a zig-zag struc-ture of web beams fixedly secured to the chords. The trusses further comprise generally vertical reinforcement beams extending between the upper and the lower chord. ~en a load supporting structure is assembled, the trusses are aligned parallel with each other and mutually connected by bridging members fixedly se-cured to appropriate parts of the trusses.
The bridging beams are normally nailed to the respec-tive portions of the trusses to provide the desired stability of the overall structure in the direction generally horizontal and normal to the elongation of the trusses.
One of the requirements of load supporting structures of the above type is that the structures be protected against "progressive collapse"~ In tfi~ pro~r~ss~Ye collaps~ of a structure sucE as a roof ~tructure whl'c~ does not ~ave ade-quate load s~arlng the load of a failed truss will be quite suddenly transferred to the adjacent trusses through the roof decking which is relatively light and will sag suddenly until it reaches a point where the decking must fail allowing the load to fall between the adjacent trusses. If the decking does not actually tear or break the load will be transferred to the adjacent trusses with an impact. Since an impact on a structure which is already heavily loaded is very severe it is quite likely that the adiacent trusses will also fail unless they have an extremely great safety factor. In other words ~f one of the trusses fails at its load, then the load no longer carried by the failed truss must be completely transferred to the remaining trusses, otherwise the trusses adjacent to the failed 1 - ~F
~0628~o one may further collapse due to an increased load caused by the failure of the former truss.
Most of the known load supporting structures of the above type do not achieve such load sharing at all. Some of the known structures achieve the load sharing by having e.g. roof decking of sufficient strength to transfer the loads. Another known means of load sharing is through a combination of decking and bridging. As the bridging beams are normally nailed to the re-spective portions of the trusses, they are not capable of reliable transfer of the load from the failed truss towardsthe rest of the structure, unless a great number of nails is used, which is impractical. The use of relatively strong roof decking, on the other hand, results in increased costs.
It is an object of t~e pre~ent ~nYent~on ta pxoYide - - an improved load supporting structure, of t~e above type ~fil-c~
would have an improved resistance to the progressive collapse.
It is a further object of the present invention to provide a truss made of timber beams which would be capable of a complete transfer of load from a failed truss to the remaining portions of the structure by use of regular timber beam bridg-ing members nailed to appropriate portions of a truss, without the need for a great and impractical number of nails at the joinders between each of the bridging beams and the respective trusses.
The load supporting structure according to the present invention includes a plurality of elongated timber trusses arranged in an aligned relationship. Each truss has an upper chord vertically spaced from a bottom chord and web section members spanning the chords generally in a zig-zag fashion.
The structure furt~er includes a plurality of timber bridging beams of an upwardly elongated cross-section, preferably of a rectangular cross-s~ct~on~ ~h~r~hy~e~ch ~eam ha~ a.top face, a bottom face and two side faces. The bridging beams pass through
- 2 -the respec*ive trusses and extend generally horizontally at an angle, preferably a r;ght angle, with respect to the elongation of said trusses. The bridging beams are secured to the respec-tive trusses such that both said top faces and said bottom faces of the beams are in a face-to-face engagement with the as-so-ciated portions of t~e trusses through whic~ the beams pass.
The invention also provides a truss for use in the above structure. The truss is made of timber beams fixedly secured to one another and forming an upper chord portion, a lower chord portion and a web section, said web section comprising a plurality of wooden beams extending between the cord portions in a zig-zag fashion. The web beams forming the zig-zag structure are fi~edly secured with their ends to the respec-tive cord portions, w~ereby t~e web sectîon includes a plurality of pairs of the wooden beams w~ose jo~nders are each adjacent to and generally coincident with t~e lower chord portion.
Each of the pairs thus defines a V-shaped structure. A
generally vertical reinforcement beam extends from the center of such V-shaped structure and is fixedly secured with its lower end to the V-shaped structure and with its top end to the upper chord portion, The vertical reinforcement beam includes generally horizontal ledge means disposed to one side of the vertical beam.
The ledge means is disposed at the upper portion of the vertical beam, in proximity to but vertically spaced from the upper chord portion. In a preferred embodiment the ledge means is unitary with the vertical reinforcement beam and is, in fact, a bottom wall of a rectangular recess provided in one side of the vertical reinforcement beam.
Thé recess is upwardly elongated to receive a bridging beam.
The invention also provides a truss for use in the above structure. The truss is made of timber beams fixedly secured to one another and forming an upper chord portion, a lower chord portion and a web section, said web section comprising a plurality of wooden beams extending between the cord portions in a zig-zag fashion. The web beams forming the zig-zag structure are fi~edly secured with their ends to the respec-tive cord portions, w~ereby t~e web sectîon includes a plurality of pairs of the wooden beams w~ose jo~nders are each adjacent to and generally coincident with t~e lower chord portion.
Each of the pairs thus defines a V-shaped structure. A
generally vertical reinforcement beam extends from the center of such V-shaped structure and is fixedly secured with its lower end to the V-shaped structure and with its top end to the upper chord portion, The vertical reinforcement beam includes generally horizontal ledge means disposed to one side of the vertical beam.
The ledge means is disposed at the upper portion of the vertical beam, in proximity to but vertically spaced from the upper chord portion. In a preferred embodiment the ledge means is unitary with the vertical reinforcement beam and is, in fact, a bottom wall of a rectangular recess provided in one side of the vertical reinforcement beam.
Thé recess is upwardly elongated to receive a bridging beam.
3~ The spacing between the ledge means and the bottom surface of the associated upper chord is such that with the bridging beam in place, the bottom surface of the bridging is generally coincident with the ledge while the top surface of the beam is generally coincident ! 3 - 106Z~70 with the bottom surface of the associated upper c~ord portion.
T~e invention will now ~e descr~ed ~y ~ay of a pre-ferred embodiment with reference to tfie accompanying drawings:
Figure 1 ls a schematic front view of a part of a truss made of timber and incorporating one embodiment of the fea-tures of the present invention;
Figure 2 is a view similar to Figure l but showing a truss of a slightly different type; and Figure 3 is a schematic perspective view of a part of io an embodiment of load supporting structure according to the present invention.
The corresponding parts in Figure 1 - 3 are referred to wit~ the same reference numerals.
Turning now to Figure 1, a truss 10 is s~o~n made of -timber means fixedly secured to one other by means of gusset plates ll in a ~ell known manner. The beam com-... .
prises a top chord 12 which, in Figure l, is horizontal and generally parallel with a bottom c~ord 13. A plurality of wooden 2~ beams 14, 15 extends between t~e cords 12, 13 in a zig-zag fashion. It will be appreciated that the beams 14, 15 thus for~
a pl~rality of pairs of beams 14 - 15 each defining, i`n front view of Figure 1 or Figure 2, a V-shaped structure, A generally vertical reinforcement beam 16 extends from the center of each of the V-shaped structures defined by ad-jacent wooden beams 14, 15, with the bottom end of each of the beams 16 being fixedly secured to the respective V-shaped structure 14, 15, the top of each of t~e beams 16 ~eing fixedly secured to the associated section of the upper chord.
Each of the reinforcement beams 16 is provided with a hori-zontal ledge 17 which is located in proximity to but vertically spacea from the respective upper chord 12. In the embodiments shown in the drawings, the ledge forms a bottom wall of an upward-
T~e invention will now ~e descr~ed ~y ~ay of a pre-ferred embodiment with reference to tfie accompanying drawings:
Figure 1 ls a schematic front view of a part of a truss made of timber and incorporating one embodiment of the fea-tures of the present invention;
Figure 2 is a view similar to Figure l but showing a truss of a slightly different type; and Figure 3 is a schematic perspective view of a part of io an embodiment of load supporting structure according to the present invention.
The corresponding parts in Figure 1 - 3 are referred to wit~ the same reference numerals.
Turning now to Figure 1, a truss 10 is s~o~n made of -timber means fixedly secured to one other by means of gusset plates ll in a ~ell known manner. The beam com-... .
prises a top chord 12 which, in Figure l, is horizontal and generally parallel with a bottom c~ord 13. A plurality of wooden 2~ beams 14, 15 extends between t~e cords 12, 13 in a zig-zag fashion. It will be appreciated that the beams 14, 15 thus for~
a pl~rality of pairs of beams 14 - 15 each defining, i`n front view of Figure 1 or Figure 2, a V-shaped structure, A generally vertical reinforcement beam 16 extends from the center of each of the V-shaped structures defined by ad-jacent wooden beams 14, 15, with the bottom end of each of the beams 16 being fixedly secured to the respective V-shaped structure 14, 15, the top of each of t~e beams 16 ~eing fixedly secured to the associated section of the upper chord.
Each of the reinforcement beams 16 is provided with a hori-zontal ledge 17 which is located in proximity to but vertically spacea from the respective upper chord 12. In the embodiments shown in the drawings, the ledge forms a bottom wall of an upward-
- 4 -' 1062870 Iy elongated rectangular recess 18 cut out at one side of the vertical beam 16. The spacing of ledge 17 from the respective bottom surface 19 of the top chord 12 is such that when a plura-lity of trusses is aligned to build a load supporting structure, bridging beams 20 ~not shown in Figure 1) are received in the re-spective recesses 18 (Figure 3) such that the bottom surface 19 of each of the top chords 12 is generally coincident with the respective section of the upper surface 21 of the bridging beam 20, while the bottom surface 22 of each of the beams 20 is gen-erally coincident with the ledge 17.
As best -seen from Figure 2, the depth of the recess 18 is such that the ledge 17 supports substantial width of the assoc-iated section of the bottom surface 2~ of beam 20.
The structure as shown in Figure 3 can have the bridging beams 20 nailed to the respective reinforcement beams 16 in re-gular manner, without the need for excessive number of nails.
Assuming that any of the trusses as shown in Figure 3 breaks or otherwise fails, it will be appreciated that the beams 20 read-ily transfer the load no longer supported by the broken truss to the adjoining structure. In other words, the nails (not shown in the drawings) normally used in securing the beams 20 to trusses lO only operate as means for maintaining longitudinal stability of the overall structure. The nails are not stressed by vertical forces, all such vertical stresses being transferred to the re-spective trusses 10 through the respective ledges 17. In general terms, Fig. 3 shows an embodiment of the bridging beams being secured to the respective trusses such that both the top faces 21 and the bottom faces of the trusses are in a face-to-face engagement with associated portions of said trusses, namely with the bottom faces l9 of the upper chords 12 and with the ledges 17, respectively.
1062~i70 It will thus be appreciated that the present invention provides an extremely simple yet efficient improvement in the art of load supporting structures for the building industry which is relatively light-weight and, at the same time, strong enough to reduce the danger of the "progressive collapse" if one of the trusses fails for some reason or another. In a load sharing structure of the present invention - presuming there is one weak truss (i.e. a local overload) - the weak or overloaded truss will be less capable of resisting the load and will deflect more than the adjacent trusses as the load is being applied. A typical example of such gradually applied load is snowfall. As the deflection difference increases between the weak truss and its adjacent partners the load sharing bridging will begin to work transferring part of the load of the weak truss to the adjacent ones before failure of the weak truss. This may possibly prevent failure as the weak truss may never reach its yield point. The load sharing bridging will be transferring a great portion of the load of the weak truss before the yield point is reached which will reduce or eliminate the impact type load transfer to the adjacent trusses. This ensures that the adjacent trusses are more capable of carrying the extra load - reducing the likeli-hood is progressive collapse.
Those skilled in the art will readily appreciate that the trusses shown in the accompanying drawings are not the only ones in which the present invention can be included. It will be seen on comparison of Figures 1 and 2 that the upper and lower cords can be parallel with each other, as shown in Figure 1 or they may diverge as shown in Figure 2. The upper chord may also be curved, without departing from the scope of the inven-tion. The ledges 17 supporting the beams 20 are preferably uni-tary with the respective vertical beams 16 even though an embodi-ment wherein the ledge would be a separate part fixedly secured to the beam 16 would still fall within the scope of the present 106Z8"~0 invention. Turthermore, lt ~ill ~e appreclated t~at t~e overall load supporting structure can also differ from the embodiment of Fig. 3. A bridging member can be a truss with a depth equal to the distance between the bottom of the upper chord and the top of the Vee of the web members. Another readily conceivable embodiment would use the bridging member only in every second Vee of t~e truss.
However, these and many other modifications of the disclosed embodiments do not depart from the scope of the present invention as defined in the accompanying claims.
As best -seen from Figure 2, the depth of the recess 18 is such that the ledge 17 supports substantial width of the assoc-iated section of the bottom surface 2~ of beam 20.
The structure as shown in Figure 3 can have the bridging beams 20 nailed to the respective reinforcement beams 16 in re-gular manner, without the need for excessive number of nails.
Assuming that any of the trusses as shown in Figure 3 breaks or otherwise fails, it will be appreciated that the beams 20 read-ily transfer the load no longer supported by the broken truss to the adjoining structure. In other words, the nails (not shown in the drawings) normally used in securing the beams 20 to trusses lO only operate as means for maintaining longitudinal stability of the overall structure. The nails are not stressed by vertical forces, all such vertical stresses being transferred to the re-spective trusses 10 through the respective ledges 17. In general terms, Fig. 3 shows an embodiment of the bridging beams being secured to the respective trusses such that both the top faces 21 and the bottom faces of the trusses are in a face-to-face engagement with associated portions of said trusses, namely with the bottom faces l9 of the upper chords 12 and with the ledges 17, respectively.
1062~i70 It will thus be appreciated that the present invention provides an extremely simple yet efficient improvement in the art of load supporting structures for the building industry which is relatively light-weight and, at the same time, strong enough to reduce the danger of the "progressive collapse" if one of the trusses fails for some reason or another. In a load sharing structure of the present invention - presuming there is one weak truss (i.e. a local overload) - the weak or overloaded truss will be less capable of resisting the load and will deflect more than the adjacent trusses as the load is being applied. A typical example of such gradually applied load is snowfall. As the deflection difference increases between the weak truss and its adjacent partners the load sharing bridging will begin to work transferring part of the load of the weak truss to the adjacent ones before failure of the weak truss. This may possibly prevent failure as the weak truss may never reach its yield point. The load sharing bridging will be transferring a great portion of the load of the weak truss before the yield point is reached which will reduce or eliminate the impact type load transfer to the adjacent trusses. This ensures that the adjacent trusses are more capable of carrying the extra load - reducing the likeli-hood is progressive collapse.
Those skilled in the art will readily appreciate that the trusses shown in the accompanying drawings are not the only ones in which the present invention can be included. It will be seen on comparison of Figures 1 and 2 that the upper and lower cords can be parallel with each other, as shown in Figure 1 or they may diverge as shown in Figure 2. The upper chord may also be curved, without departing from the scope of the inven-tion. The ledges 17 supporting the beams 20 are preferably uni-tary with the respective vertical beams 16 even though an embodi-ment wherein the ledge would be a separate part fixedly secured to the beam 16 would still fall within the scope of the present 106Z8"~0 invention. Turthermore, lt ~ill ~e appreclated t~at t~e overall load supporting structure can also differ from the embodiment of Fig. 3. A bridging member can be a truss with a depth equal to the distance between the bottom of the upper chord and the top of the Vee of the web members. Another readily conceivable embodiment would use the bridging member only in every second Vee of t~e truss.
However, these and many other modifications of the disclosed embodiments do not depart from the scope of the present invention as defined in the accompanying claims.
Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
A truss made of timber beams fixedly secured to one another, comprising an upper chord portion, a bottom chord portion and a web section, said web section comprising a plurality of wooden beams extending between the chord portions in a zig-zag fashion and being fixedly secured with their ends to the respec-tive chord portions, whereby said web section includes a plurality of pairs of said wooden beams whose joinders are adjacent to and generally coincident with said bottom chord portion whereby each of said pairs of said beams defines a V-shaped structure;and a generally vertical reinforcement beam extending from the center of said V-shaped structure and fixedly secured with its lower end to the V-shaped structure and with its top end to said upper chord portion, a vertical reinforcement beam including a generally horizontal ledge means disposed to one side thereof, said ledge means being a bottom wall of an upwardly elongated, rectangular recess having a predetermined height, the top wall of said recess being formed by adjacent part of the lower face of said upper chord portion, said predetermined height generally corresponding to the height of bridging means of an upwardly elongated, rectangular cross section; whereby said truss is capable of receiving within said recess said bridging means such that the top and bottom faces of the bridging means engage the top and bottom walls of said rectangular recess, respectively.
A truss made of timber beams fixedly secured to one another, comprising an upper chord portion, a bottom chord portion and a web section, said web section comprising a plurality of wooden beams extending between the chord portions in a zig-zag fashion and being fixedly secured with their ends to the respec-tive chord portions, whereby said web section includes a plurality of pairs of said wooden beams whose joinders are adjacent to and generally coincident with said bottom chord portion whereby each of said pairs of said beams defines a V-shaped structure;and a generally vertical reinforcement beam extending from the center of said V-shaped structure and fixedly secured with its lower end to the V-shaped structure and with its top end to said upper chord portion, a vertical reinforcement beam including a generally horizontal ledge means disposed to one side thereof, said ledge means being a bottom wall of an upwardly elongated, rectangular recess having a predetermined height, the top wall of said recess being formed by adjacent part of the lower face of said upper chord portion, said predetermined height generally corresponding to the height of bridging means of an upwardly elongated, rectangular cross section; whereby said truss is capable of receiving within said recess said bridging means such that the top and bottom faces of the bridging means engage the top and bottom walls of said rectangular recess, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA258,556A CA1062870A (en) | 1976-08-06 | 1976-08-06 | Load supporting structure and a truss for use therein |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA258,556A CA1062870A (en) | 1976-08-06 | 1976-08-06 | Load supporting structure and a truss for use therein |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062870A true CA1062870A (en) | 1979-09-25 |
Family
ID=4106594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA258,556A Expired CA1062870A (en) | 1976-08-06 | 1976-08-06 | Load supporting structure and a truss for use therein |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1062870A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2554482A1 (en) * | 1983-11-04 | 1985-05-10 | Blanvillain Fils Ets | Lightened beam for a framework and framework comprising such beams |
| US4790113A (en) * | 1986-02-18 | 1988-12-13 | Gregory Robert K | Adjustable depth truss |
| US5234279A (en) * | 1988-09-14 | 1993-08-10 | Poutanen Tuoma Tapani | Connector plates, connector plate joints and connector plate structures |
| US5617693A (en) * | 1996-01-22 | 1997-04-08 | Hefner; Richard P. | Prefabricated wall trusses for super-insulated walls |
-
1976
- 1976-08-06 CA CA258,556A patent/CA1062870A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2554482A1 (en) * | 1983-11-04 | 1985-05-10 | Blanvillain Fils Ets | Lightened beam for a framework and framework comprising such beams |
| US4790113A (en) * | 1986-02-18 | 1988-12-13 | Gregory Robert K | Adjustable depth truss |
| US5234279A (en) * | 1988-09-14 | 1993-08-10 | Poutanen Tuoma Tapani | Connector plates, connector plate joints and connector plate structures |
| US5617693A (en) * | 1996-01-22 | 1997-04-08 | Hefner; Richard P. | Prefabricated wall trusses for super-insulated walls |
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