CA2327763A1 - A metal roof truss - Google Patents
A metal roof truss Download PDFInfo
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- CA2327763A1 CA2327763A1 CA 2327763 CA2327763A CA2327763A1 CA 2327763 A1 CA2327763 A1 CA 2327763A1 CA 2327763 CA2327763 CA 2327763 CA 2327763 A CA2327763 A CA 2327763A CA 2327763 A1 CA2327763 A1 CA 2327763A1
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- roof truss
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Abstract
The present invention relates generally to in-situ construction of a metal roof truss according to a preferred embodiment of the invention. The sequential and preferred steps involved are as follows: a pair of upper chord members 10A and 10B together with a lower chord member 12 are laid out in a required configuration;
the chords 10A/B and 12 are loosely connected together via respective fasteners (not shown) located at knee 14A
and 14B and apex 16 connections as depicted in Figure 1a;
a pair of central web members 18A and 18B are connected between the apex connection 16 and the lower chord member 12 via other respective fasteners located at opposing ends of the central web members 18A/B as illustrated in figure 1b; two pairs of intermediate web members 20A/B
and 22A/B are at opposing ends connected to the upper chord 10A or 10B and the lower chord 12 via additional fasteners as shown in Figure 1c; and the fasteners forming the knee and apex connections 14A/B and 16 are tightened and thereafter all fasteners associated with a web member 20 or 22 are fastened to complete construction of the metal roof truss 1 of Figure 1d.
the chords 10A/B and 12 are loosely connected together via respective fasteners (not shown) located at knee 14A
and 14B and apex 16 connections as depicted in Figure 1a;
a pair of central web members 18A and 18B are connected between the apex connection 16 and the lower chord member 12 via other respective fasteners located at opposing ends of the central web members 18A/B as illustrated in figure 1b; two pairs of intermediate web members 20A/B
and 22A/B are at opposing ends connected to the upper chord 10A or 10B and the lower chord 12 via additional fasteners as shown in Figure 1c; and the fasteners forming the knee and apex connections 14A/B and 16 are tightened and thereafter all fasteners associated with a web member 20 or 22 are fastened to complete construction of the metal roof truss 1 of Figure 1d.
Description
A METAL ROOF TRUSS
FIELD OF THE INVENTION
The present invention relates generally to a metal roof truss and relates particularly, though not exclusively, to a method of in-situ construction of a metal roof truss. The invention further relates to a kit of prefabricated metal roof truss components.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
According to another aspect of the invention there is provided a method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent one or opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
FIELD OF THE INVENTION
The present invention relates generally to a metal roof truss and relates particularly, though not exclusively, to a method of in-situ construction of a metal roof truss. The invention further relates to a kit of prefabricated metal roof truss components.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
According to another aspect of the invention there is provided a method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent one or opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
Preferably the method further comprises the steps of providing one or more web members each being prefabricated to a predetermined length and at opposing ends including a web fixing aperture, and fastening each of said web members between one of the upper chord members and the lower chord member via a web fastener which engages one of the web fixing apertures and a corresponding aperture preformed in the upper or the lower chord member.
Preferably fastening of the chord members together is effected via a bolt and nut arrangement which passes through the apex apertures whereupon tightening of the bolt and nut clamps the chord members together.
Preferably fastening of each of the web members between one of the upper chord members and the lower chord member is effected via a screw which passes through the web aperture and the corresponding aperture of the upper or lower chord member whereupon tightening of the screw clamps the web member to the respective chord member. In this embodiment the bolt and nut arrangement or the screw constitutes the apex/knee or web fastener.
According to yet another aspect of the invention there is provided a kit of prefabricated metal roof truss components comprising:
a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
According to a further aspect of the invention there is provided a kit of prefabricated metal roof truss components comprising:
Preferably fastening of the chord members together is effected via a bolt and nut arrangement which passes through the apex apertures whereupon tightening of the bolt and nut clamps the chord members together.
Preferably fastening of each of the web members between one of the upper chord members and the lower chord member is effected via a screw which passes through the web aperture and the corresponding aperture of the upper or lower chord member whereupon tightening of the screw clamps the web member to the respective chord member. In this embodiment the bolt and nut arrangement or the screw constitutes the apex/knee or web fastener.
According to yet another aspect of the invention there is provided a kit of prefabricated metal roof truss components comprising:
a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
According to a further aspect of the invention there is provided a kit of prefabricated metal roof truss components comprising:
two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
Preferably the kit further comprises one or more web members each being prefabricated to a predetermined length and at opposing ends including a web fixing aperture, and web fasteners each being designed to engage one of the web fixing apertures and a corresponding aperture performed in the upper or the lower chord member.
According to yet a further aspect of the invention there is provided a method of stiffening a hollow flange of a chord member of a metal roof truss, said hollow flange having an opposing pair of walls which together define a portion of a flange cavity, said method comprising insertion of a compression element within the flange cavity of the hollow flange whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
According to yet another aspect of the invention there is provided a compression element being adapted to stiffen a hollow flange of a chord member of a metal roof truss, the hollow flange having an opposing pair of walls which together define a portion of a flange cavity in which the compression element is configured to be inserted whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
Preferably the compression element is shaped complementary to and is a press-fit within the cavity of the flange. More preferably the compression element is formed of timber.
According to yet a further aspect of the invention there is provided a method of metal truss roof construction comprising the step of spacing an upper chord member from a lower chord member of a metal roof truss by means of an interconnecting spacer member to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
According to still another aspect of the invention there is provided a spacer member provided at a knee connection of upper and lower chord members of a metal roof truss, the spacer member being adapted to interconnect adjacent ends of the upper and lower chord members in spaced apart relationship to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
Preferably the spacer member is a strut. More preferably the strut is of a boxed construction which in one embodiment is formed by a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to facilitate a better understanding of the nature of the present invention embodiments of a method of in-situ construction of a metal roof truss, a kit of prefabricated metal roof truss components, and other aspects of the invention will now be described with reference to the accompanying drawings in which:
Preferably the kit further comprises one or more web members each being prefabricated to a predetermined length and at opposing ends including a web fixing aperture, and web fasteners each being designed to engage one of the web fixing apertures and a corresponding aperture performed in the upper or the lower chord member.
According to yet a further aspect of the invention there is provided a method of stiffening a hollow flange of a chord member of a metal roof truss, said hollow flange having an opposing pair of walls which together define a portion of a flange cavity, said method comprising insertion of a compression element within the flange cavity of the hollow flange whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
According to yet another aspect of the invention there is provided a compression element being adapted to stiffen a hollow flange of a chord member of a metal roof truss, the hollow flange having an opposing pair of walls which together define a portion of a flange cavity in which the compression element is configured to be inserted whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
Preferably the compression element is shaped complementary to and is a press-fit within the cavity of the flange. More preferably the compression element is formed of timber.
According to yet a further aspect of the invention there is provided a method of metal truss roof construction comprising the step of spacing an upper chord member from a lower chord member of a metal roof truss by means of an interconnecting spacer member to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
According to still another aspect of the invention there is provided a spacer member provided at a knee connection of upper and lower chord members of a metal roof truss, the spacer member being adapted to interconnect adjacent ends of the upper and lower chord members in spaced apart relationship to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
Preferably the spacer member is a strut. More preferably the strut is of a boxed construction which in one embodiment is formed by a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to facilitate a better understanding of the nature of the present invention embodiments of a method of in-situ construction of a metal roof truss, a kit of prefabricated metal roof truss components, and other aspects of the invention will now be described with reference to the accompanying drawings in which:
Figures la to ld represent preferred steps involved in the in-situ construction of a metal roof truss;
Figure 2 is a detailed sectional and elevational view of a knee joint assembly of the roof truss of figure l;
Figure 3 is an assembly drawing of a metal roof truss of a truncated configuration;
Figure 4 is a schematic representation of conventional roof truss construction in conjunction with ceiling and wall insulation; and Figure 5 is a schematic representation of a roof truss according to one embodiment of this aspect of one aspect of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figures la to ld illustrate the various steps or stages involved in the in-situ construction of a metal roof truss according to a preferred embodiment of the invention. The sequential and preferred steps involved are as follows:
(i) a pair of upper chord members l0A and lOB
together with a lower chord member 12 are laid out in a required configuration;
(ii) the chords l0A/B and 12 are loosely connected together via respective fasteners (not shown) located at knee 14A and 14B and apex 16 connections as depicted in Figure la;
(iii) a pair of central web members 18A and 18B
are connected between the apex connection 16 and the lower chord member 12 via other respective fasteners located at opposing ends of the central web members 18A/B
as illustrated in figure lb;
(iv) two pairs of intermediate web members 20A/B and 22A/B are at opposing ends connected to the upper chord l0A or lOB and the lower chord 12 via additional fasteners as shown in Figure lc;
Figure 2 is a detailed sectional and elevational view of a knee joint assembly of the roof truss of figure l;
Figure 3 is an assembly drawing of a metal roof truss of a truncated configuration;
Figure 4 is a schematic representation of conventional roof truss construction in conjunction with ceiling and wall insulation; and Figure 5 is a schematic representation of a roof truss according to one embodiment of this aspect of one aspect of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figures la to ld illustrate the various steps or stages involved in the in-situ construction of a metal roof truss according to a preferred embodiment of the invention. The sequential and preferred steps involved are as follows:
(i) a pair of upper chord members l0A and lOB
together with a lower chord member 12 are laid out in a required configuration;
(ii) the chords l0A/B and 12 are loosely connected together via respective fasteners (not shown) located at knee 14A and 14B and apex 16 connections as depicted in Figure la;
(iii) a pair of central web members 18A and 18B
are connected between the apex connection 16 and the lower chord member 12 via other respective fasteners located at opposing ends of the central web members 18A/B
as illustrated in figure lb;
(iv) two pairs of intermediate web members 20A/B and 22A/B are at opposing ends connected to the upper chord l0A or lOB and the lower chord 12 via additional fasteners as shown in Figure lc;
(v) the fasteners forming the knee and apex connections 14A/B and 16 are tightened and thereafter all fasteners associated with a web member 20 or 22 are fastened to complete construction of the metal roof truss 1 of Figure ld.
In this embodiment adjacent ends of adjacent web members such as 18A and 20A are interconnected at a right angle to one another in a zig zag configuration. The web members are constructed of a cold roll formed closed or opened section depending on loading of the roof truss 1.
For example, the central web members 18A and 18B may be constructed of a closed box section formed by a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another. The closed box section is appropriate for web members which experience predominantly compression loading such as that exerted by roof cladding such as roof tiles. The intermediate web members such as 20A may, particularly under relatively windy conditions, be prefabricated in the form of a channel-section which is designed to handle tension loading.
The upper and lower chord members l0A and 12 of figure 2 are in this example cold roll formed from relatively light gauge strips steel such as that from which the web members are fabricated. The upper chord l0A is of a dog-bone configuration. Importantly, in cross-section the upper chord l0A has its lower hollow flange 24 located on one side only of its central web 26.
The lower chord member 12 is of a similar construction to the upper chord l0A but with its end portion modified for coupling to the upper chord l0A so as to form the knee connection 14A. In this embodiment the upper chord 10A
is connected to the lower chord 12 via a bolt and arrangement 28.
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.W.,._._."~___,.~....~. ..~........................
_ 7 _ According to another aspect of the present invention a lower hollow flange 30 of the lower chord 12 is stiffened by a compression element 32. The compression element 32 of this embodiment is formed of timber and shaped complementary so as to be a press fit within the lower flange 30. The compression element 32 is designed to transfer compression loads from a lower wall 34 to an upper wall 36 of the lower flange 30. This is particularly advantageous where the lower chord 12 of the roof truss 1 rests on a wall, wall plate, or the like.
Additionally, the knee connection 14A of Figure 2 includes a web stiffening envelope 38 which wraps about a web 40 of the lower chord 12. The upper chord l0A is also provided with a web stiffener 42 which is generally C-shaped and configured to rest within a web portion of the upper chord 10A. The bolt and nut arrangement 28 engages an aperture 44 which is preformed in the upper and lower chords l0A and 12 together with the web stiffeners 38 and 42. Thus, the bolt and nut arrangement 28 serves to clamp or tighten the upper chord l0A to the lower chord 12 so as to form the knee connection 14A.
The opposing knee connection 14B is of an identical construction. Advantageously, the offset flange such as 24 of the upper chord l0A permits relatively quick coupling of the upper chord l0A or lOB to the lower chord 12 to form the respective knee connection 14A or 14B.
Figure 3 is an assembly drawing of an alternative metal roof truss 10 of a truncated configuration. In this embodiment the roof truss 10 includes three (3) upper chord members 100A to 100C. In order to avoid repetition and for ease of reference similar components of this truncated truss 10 are designated with an additional "0". For example, the lower chord member is designated as 120. The truncated truss 10 of this embodiment includes a pair of apex connections 160A and 160B. Otherwise, the preferred technique for fabrication of this metal roof truss 10 is substantially the same as that described above for the roof truss 1 of the "A" type configuration. The lower chord member 120 may also be constructed from two or more chord members.
Figure 4 illustrates a metal roof truss of a conventional configuration. The ceiling space and external wall 2 and 3, respectively, are insulated with a fibreglass insulation material such as batts and urethane boards which are represented by the solid squiggly lines of Figure 4. Alternatively the insulation may be paper, foam or any combination of heat insulation materials. As clearly depicted by the solid line passing between the ceiling and external wall, a thermal bridge exists where insulation is not provided.
Figure 5 illustrates a further aspect of the invention which is intended to overcome the problem identified in the preceding paragraph in relation to the thermal bridge which exists in conventional roof truss construction. In this particular embodiment of the invention, an upper chord member 50 is spaced from a lower chord member 52 of a metal roof truss 54 via an interconnecting spacer member 56. The spacer member 56 is fabricated from a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another. Opposing ends of the spacer member 56 are bolted or otherwise fixed to the upper and lower chords 50 and 52, respectively. The spacer member 56 is of a suitable height to permit ceiling insulation 58 and external wall insulation 60 to contact one another so as to provide a complete insulation barrier adjacent the hip connection 62 of the roof truss 54. The insulation materials are schematically represented by the squiggly lines of Figure 4. The overlapping or abutting contact of the ceiling insulation 58 with the wall insulation 60 eliminates the thermal bridge which exists in conventional roof truss construction. In this _ g _ example, an intermediate support strut 64 is at opposing ends fixed to the upper and lower chords 50 and 52, respectively. This strut 64 provides additional rigidity and strength to the hip connection 62.
Those skilled in the art will appreciate that the invention described herein is susceptible to variations and modifications other than those specifically described. For example, the sequence and specific steps described in the in-situ construction of the metal roof truss may vary provided it is possible to construct a metal roof truss on site from prefabricated components.
The compression element may be formed from practically any material which is suitable in transferring compression loads between opposing walls of a hollow flange. All such variations and modifications are to be considered within the scope of the present invention the nature of which is to be determined from the foregoing description.
In the preceding summary of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprising"
is used in the sense of "including", that is the features specified may be associated with further features in various embodiments of the invention.
In this embodiment adjacent ends of adjacent web members such as 18A and 20A are interconnected at a right angle to one another in a zig zag configuration. The web members are constructed of a cold roll formed closed or opened section depending on loading of the roof truss 1.
For example, the central web members 18A and 18B may be constructed of a closed box section formed by a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another. The closed box section is appropriate for web members which experience predominantly compression loading such as that exerted by roof cladding such as roof tiles. The intermediate web members such as 20A may, particularly under relatively windy conditions, be prefabricated in the form of a channel-section which is designed to handle tension loading.
The upper and lower chord members l0A and 12 of figure 2 are in this example cold roll formed from relatively light gauge strips steel such as that from which the web members are fabricated. The upper chord l0A is of a dog-bone configuration. Importantly, in cross-section the upper chord l0A has its lower hollow flange 24 located on one side only of its central web 26.
The lower chord member 12 is of a similar construction to the upper chord l0A but with its end portion modified for coupling to the upper chord l0A so as to form the knee connection 14A. In this embodiment the upper chord 10A
is connected to the lower chord 12 via a bolt and arrangement 28.
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.W.,._._."~___,.~....~. ..~........................
_ 7 _ According to another aspect of the present invention a lower hollow flange 30 of the lower chord 12 is stiffened by a compression element 32. The compression element 32 of this embodiment is formed of timber and shaped complementary so as to be a press fit within the lower flange 30. The compression element 32 is designed to transfer compression loads from a lower wall 34 to an upper wall 36 of the lower flange 30. This is particularly advantageous where the lower chord 12 of the roof truss 1 rests on a wall, wall plate, or the like.
Additionally, the knee connection 14A of Figure 2 includes a web stiffening envelope 38 which wraps about a web 40 of the lower chord 12. The upper chord l0A is also provided with a web stiffener 42 which is generally C-shaped and configured to rest within a web portion of the upper chord 10A. The bolt and nut arrangement 28 engages an aperture 44 which is preformed in the upper and lower chords l0A and 12 together with the web stiffeners 38 and 42. Thus, the bolt and nut arrangement 28 serves to clamp or tighten the upper chord l0A to the lower chord 12 so as to form the knee connection 14A.
The opposing knee connection 14B is of an identical construction. Advantageously, the offset flange such as 24 of the upper chord l0A permits relatively quick coupling of the upper chord l0A or lOB to the lower chord 12 to form the respective knee connection 14A or 14B.
Figure 3 is an assembly drawing of an alternative metal roof truss 10 of a truncated configuration. In this embodiment the roof truss 10 includes three (3) upper chord members 100A to 100C. In order to avoid repetition and for ease of reference similar components of this truncated truss 10 are designated with an additional "0". For example, the lower chord member is designated as 120. The truncated truss 10 of this embodiment includes a pair of apex connections 160A and 160B. Otherwise, the preferred technique for fabrication of this metal roof truss 10 is substantially the same as that described above for the roof truss 1 of the "A" type configuration. The lower chord member 120 may also be constructed from two or more chord members.
Figure 4 illustrates a metal roof truss of a conventional configuration. The ceiling space and external wall 2 and 3, respectively, are insulated with a fibreglass insulation material such as batts and urethane boards which are represented by the solid squiggly lines of Figure 4. Alternatively the insulation may be paper, foam or any combination of heat insulation materials. As clearly depicted by the solid line passing between the ceiling and external wall, a thermal bridge exists where insulation is not provided.
Figure 5 illustrates a further aspect of the invention which is intended to overcome the problem identified in the preceding paragraph in relation to the thermal bridge which exists in conventional roof truss construction. In this particular embodiment of the invention, an upper chord member 50 is spaced from a lower chord member 52 of a metal roof truss 54 via an interconnecting spacer member 56. The spacer member 56 is fabricated from a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another. Opposing ends of the spacer member 56 are bolted or otherwise fixed to the upper and lower chords 50 and 52, respectively. The spacer member 56 is of a suitable height to permit ceiling insulation 58 and external wall insulation 60 to contact one another so as to provide a complete insulation barrier adjacent the hip connection 62 of the roof truss 54. The insulation materials are schematically represented by the squiggly lines of Figure 4. The overlapping or abutting contact of the ceiling insulation 58 with the wall insulation 60 eliminates the thermal bridge which exists in conventional roof truss construction. In this _ g _ example, an intermediate support strut 64 is at opposing ends fixed to the upper and lower chords 50 and 52, respectively. This strut 64 provides additional rigidity and strength to the hip connection 62.
Those skilled in the art will appreciate that the invention described herein is susceptible to variations and modifications other than those specifically described. For example, the sequence and specific steps described in the in-situ construction of the metal roof truss may vary provided it is possible to construct a metal roof truss on site from prefabricated components.
The compression element may be formed from practically any material which is suitable in transferring compression loads between opposing walls of a hollow flange. All such variations and modifications are to be considered within the scope of the present invention the nature of which is to be determined from the foregoing description.
In the preceding summary of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprising"
is used in the sense of "including", that is the features specified may be associated with further features in various embodiments of the invention.
Claims (16)
1. A method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
providing a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
2. A method of in-situ construction of a metal roof truss, said method comprising the steps of:
providing two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent one or opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
providing two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent one or opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and fastening the chords together via apex or knee fasteners which each engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
3. A method of in-situ construction of a metal roof truss as defined in claim 1 or 2 further comprising the steps of providing one or more web members each being prefabricated to a predetermined length and at opposing ends including a web fixing aperture, and fastening each of said web members between one of the upper chord members and the lower chord member via a web fastener which engages one of the web fixing apertures and a corresponding aperture preformed in the upper or the lower chord member.
4. A method of in-situ construction of a metal roof truss as defined in any one of the preceding claims wherein fastening of the chord members together is effected via a bolt and nut arrangement which passes through the apex apertures whereupon tightening of the bolt and nut clamps the chord members together.
5. A method of in-situ construction of a metal roof truss as defined in claim 3 wherein fastening of each of the web members between one of the upper chord members and the lower chord member is effected via a screw which passes through the web aperture and the corresponding aperture of the upper or lower chord member whereupon tightening of the screw clamps the web member to the respective chord member.
6. A kit of prefabricated metal roof truss components comprising:
a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
a pair of upper chord members and a lower chord member each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
7. A kit of prefabricated metal roof truss components comprising:
two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
two or more upper chord members and one or more lower chord members each being prefabricated to a predetermined length and at or adjacent opposing ends including a preformed apex or hip aperture being arranged for assembly of said members into the roof truss; and apex or knee fasteners each being designed to engage respective of the apertures so as to form an apex connection and a pair of knee connections of the roof truss.
8. A kit of prefabricated metal roof truss components as defined in claim 6 or 7 further comprising one or more web members each being prefabricated to a predetermined length and at opposing ends including a web fixing aperture, and web fasteners each being designed to engage one of the web fixing apertures and a corresponding aperture performed in the upper or the lower chord member.
9. A method of stiffening a hollow flange of a chord member of a metal roof truss, said hollow flange having an opposing pair of walls which together define a portion of a flange cavity, said method comprising insertion of a compression element within the flange cavity of the hollow flange whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
10. A compression element being adapted to stiffen a hollow flange of a chord member of a metal roof truss, the hollow flange having an opposing pair of walls which together define a portion of a flange cavity in which the compression element is configured to be inserted whereby in use said element serves to transfer compression loads from one to the other of the pair of walls of said flange.
11. A compression element as defined in claim 10 which is shaped complementary to and is a press-fit within the cavity of the flange.
12. A compression element as defined in claim 10 or 11 which is formed of timber.
13. A method of metal truss roof construction comprising the step of spacing an upper chord member from a lower chord member of a metal roof truss by means of an interconnecting spacer member to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
14. A spacer member provided at a knee connection of upper and lower chord members of a metal roof truss, the spacer member being adapted to interconnect adjacent ends of the upper and lower chord members in spaced apart relationship to enable said chord members to be arranged so as to provide adequate space for ceiling and wall insulation to contact one another to allow for a substantially complete insulation barrier adjacent said roof truss at a ceiling and wall juncture.
15. A spacer member as defined in claim 14 which is a strut.
16. A spacer member as defined in claim 15 wherein the strut is of a boxed construction which is formed by a pair of channel-section members having opposing flange walls connected, such as by crimping, to one another.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPQ4540 | 1999-12-08 | ||
| AUPQ4540A AUPQ454099A0 (en) | 1999-12-08 | 1999-12-08 | A metal roof truss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2327763A1 true CA2327763A1 (en) | 2001-06-08 |
Family
ID=3818681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2327763 Abandoned CA2327763A1 (en) | 1999-12-08 | 2000-12-06 | A metal roof truss |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AUPQ454099A0 (en) |
| CA (1) | CA2327763A1 (en) |
-
1999
- 1999-12-08 AU AUPQ4540A patent/AUPQ454099A0/en not_active Abandoned
-
2000
- 2000-12-06 CA CA 2327763 patent/CA2327763A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AUPQ454099A0 (en) | 2000-01-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |