JP2004084353A - Roof truss beam installing structure and roof truss beam installing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof truss beam installing structure which erects and sets a roof truss beam constructed beforehand as a single span in a stable state, in the construction field, without a hitch in the course of transportation of the truss beam. <P>SOLUTION: The roof truss beam 13 installing structure is provided for supporting the roof truss beam 13 which is to be arranged along a plane perpendicular to a ridge 12 to constitute a skeleton of a roof section 10, by a wall structure 15 of a house building 11, and installing the truss beam 13 on the roof section 10. The roof truss beam 13 consists of a pair of right and left divided trusses 17, 17 which are divided into two sections by a perpendicular X falling from the apex of the truss beam 13 on a lower chord 16. When the roof truss beam 13 is installed, it is arranged astride nodes 19, 19 of the lower chords 16, 16 of the divided trusses 17, 17, respectively, and the divided trusses 17, 17 are connected together in one body via a joint fixture 20 which resists a load that tends to separate the connection between the nodes 19, 19. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a roof truss beam installation structure and method, and more particularly to a roof truss beam for mounting a roof truss beam arranged along a plane perpendicular to a ridge on a roof portion while supporting the roof truss beam on a wall structure. The present invention relates to an installation structure and an installation method.
[0002]
Problems to be solved by the prior art and the invention
Roof truss beams consist of lower chords arranged at the bottom of triangles and trapezoids, upper chords arranged at the tops of triangles and trapezoids and oblique sides on both sides sandwiching them, and lower chords and upper chords. It is composed of a truss bundle material or a truss bundle material that is interposed therebetween, and generally has a flat frontal shape such as a substantially triangular or substantially trapezoidal shape. According to such a roof truss beam, both ends are supported by a wall structure of a house building or the like, so that the beam can be easily installed in a stable state as a large span beam, and also structurally advantageous. Therefore, it is particularly effective as a member forming a framework of a roof portion of a wooden house building.
[0003]
In addition, such roof truss beams can be assembled at a factory or the like in advance and then transported to the building construction site and installed on the roof of the house in order to increase the efficiency and accuracy of the assembly work. preferable. In particular, in a unit house in which a plurality of pre-formed house units are assembled and constructed at a construction site, by incorporating such a roof truss beam to form a roof unit, the roof portion of the unit house can be made more efficient. It becomes possible to form well.
[0004]
As described above, a roof truss beam and a roof unit incorporating the roof truss beam can be formed as a large span, and both ends of a front shape such as a substantially triangular shape or a substantially trapezoidal shape are supported by wall structures on both sides. Thus, it is possible to erection and install the roof part in a single span and in a stable state, but on the other hand, the size of a large span roof truss beam or roof unit is limited in terms of transportation. For this reason, such a structurally advantageous large-span roof truss beam or an efficient roof frame structure using a roof unit incorporating the same has not been constructed.
[0005]
The present invention has been made in view of such a conventional problem, and it has been proposed that a pre-formed roof truss beam or a roof unit incorporating the same can be installed on a construction site without hindering transportation. It is an object of the present invention to provide a roof truss beam installation structure and an installation method that can be easily installed on a roof portion in a stable state in one span.
[0006]
[Means for Solving the Problems]
The present invention relates to a roof for supporting a roof truss beam that is arranged along a plane perpendicular to a ridge and constitutes a framework of a roof portion of a residential building on the roof structure while supporting the roof truss beam on the wall structure of the residential building. An installation structure for a roof truss beam, wherein the roof truss beam is constituted by a pair of right and left split trusses divided into two parts by a vertical line descending from the top to the bottom chord of the bottom truss beam. In some cases, the pair of split trusses are joined and joined via a metal fitting that is attached across the joint portion of the lower chord of the pair of split trusses and resists a load that tries to separate the connection state at the joint portion. The above object has been achieved by providing a roof truss beam installation structure characterized in that:
[0007]
According to the installation structure of the roof truss beam of the present invention, the roof truss beam has a roof formed to have a shape occupying an area obtained by dividing a roof portion of a house into a plurality of sections by a dividing plane perpendicular to the ridge. The roof unit is divided into a pair of left and right divided roof units by a vertical surface along the perpendicular line that divides the roof truss beam into two parts. It is preferable to carry out (the invention of claim 2).
[0008]
Further, according to the roof truss beam installation structure of the present invention, the joint metal member includes a bolt fastening member previously attached to each node portion of the lower chord member of the pair of split trusses, and a bolt fastening member for these bolts. It is preferable to be composed of a bolt member which is fastened across the body (the invention according to claim 3).
[0009]
Furthermore, according to the installation structure of the roof truss beam of the present invention, the bolt fastening member is attached to each of the joint portions at a position where the side surfaces on both sides are symmetrical with respect to the lower chord material with the lower chord material interposed therebetween. The pair of front and back bolt fastening members are connected via a bridging member that vertically intersects with the lower chord member, and the pair of bolt members disposed on both sides of the lower chord member are the front and back bolt members. It is preferable that each of the bolts is fastened over a pair of bolt fastening members (the invention according to claim 4).
[0010]
Furthermore, according to the roof truss beam installation structure of the present invention, the bolt fastening member has an attached fixing plate, and is attached to both side surfaces of the lower chord material via the attached fixing plate. At each of the nodes, screws, bolts, screws, nails, and other plate-fixing rod-shaped members that penetrate the lower chord material across the attached fixing plate on the front and back are attached, so that the front and back pair It is preferable that the bolt fastening member is fixed to each node portion of the lower chord material by a two-sided shear structure (the invention according to claim 5).
[0011]
Further, the present invention is a method for installing a roof truss beam applied to the roof truss beam installation structure according to any one of the above, wherein the pair of split trusses or the pair of split roof units are respectively lifted. Conveying above the wall structure of the house building, and connecting the nodal portion of the lower chord material of the split truss via the joint hardware above the wall structure, thereby forming the pair of split trusses or the pair of split trusses. A method of installing a roof truss beam, wherein the split roof unit is joined and integrated, and both ends are supported by the wall structure, and the roof truss beam or the roof unit is installed on a roof portion. Thus, the above object has been achieved (the invention according to claim 6).
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The installation structure of the roof truss beam according to the embodiment of the present invention shown in FIGS. 1 to 4 is, for example, a wooden house building in which the roof portion 10 is a ridged roof. In the unit house 11 by the construction method, this is adopted as a structure for efficiently assembling the roof portion 10 with the ridge roof.
[0013]
That is, the installation structure of the roof truss beam of the present embodiment is arranged along a plane perpendicular to the ridge 12 as shown in FIGS. 1 and 2 and constitutes a framework of the roof portion 10 of the unit house 11. This is an installation structure for supporting a roof truss beam 13 having a triangular front shape on a wall structure 15 of a living room portion 14 of a unit house 11 and installing the truss beam 13 above the roof structure. Further, according to the installation structure of the present embodiment, the roof truss beam 13 has a front shape of a substantially right triangle divided into two parts by a perpendicular X (see FIG. 2) lowered from the top of the substantially triangle to the lower chord member 16 of the bottom. And a pair of left and right split trusses 17. These paired split trusses 17 have truss bundles 18 arranged along the vertical line X, respectively.
[0014]
When the roof truss beams 13 are installed, the truss bundles 18, 18 of the pair of split trusses 17, 17 are arranged side by side, and are attached across the joint portions 19, 19 of the lower chord members 16, 16. The pair of split trusses 18, 18 are joined and integrated via a joint hardware 20 that resists a load that tends to separate the connection state at the node portions 19, 19.
[0015]
Further, according to the present embodiment, as shown in FIG. 1, the roof truss beams 13 are provided at both ends of a plurality of regions obtained by dividing the roof portion 10 of the unit house 11 by dividing planes perpendicular to the ridge 12. The roof unit 21 is incorporated in a roof unit 21 formed in a shape occupying at least one area of an intermediate portion except for the roof unit 21 and is disposed along a division plane perpendicular to the ridge 12. The truss beam 13 is divided into a pair of right and left divided roof units 22 by a vertical plane along a perpendicular line X (see FIG. 2) that divides the truss beam 13 into two.
[0016]
According to the present embodiment, the roof unit 21 into which the roof truss beams 13 are incorporated is a housing unit having a shape of an approximately isosceles triangle that is flat when viewed from the front, as shown in FIGS. 1 and 2, It is formed by joining and integrating a pair of left and right split roof units 22, 22 previously assembled in a symmetrical shape in a factory or the like at a building construction site. Each split roof unit 22, 22 has a three-dimensional hut group, and in this hut group, a pair of divided trusses 17 formed in a substantially right-angled triangular frame shape are arranged side by side in a front-to-rear direction. At the same time, the divided truss 17 facing each other is connected and integrated via a plurality of horizontal frame members 26 and vertical frame members 27 also serving as a panel frame of a roof panel 25 attached to the upper surface of the hut set, thereby forming a three-dimensional shape. ing.
[0017]
The split trusses 17, 17 constituting the roof truss beam 13 are assembled in parallel to the split roof units 22, 22 in the front-rear direction as described above, and are attached along the split surfaces between the regions. Thereby, they are respectively arranged along a plane perpendicular to the ridge 12. According to the present embodiment, as shown in FIG. 2, each of the split trusses 17, 17 is disposed on the lower chord member 16 disposed on the base of a substantially right triangle obtained by dividing an approximately isosceles triangle into two, and on the hypotenuse. A truss bundle member 29 and an intermediate truss member 29 are provided inside a frame composed of an upper chord member 28 and a truss bundle member 18 arranged along the perpendicular X so as to connect the ends of the lower chord member 16 and the upper chord member 28 to each other. It is formed by attaching the truss bundle 30. The lower chord member 16, the upper chord member 28, the truss bundle member 18, the truss slant bundle member 29, and the intermediate truss bundle member 30 are joined to each other at a joint node thereof via a binding metal or the like, so that a strong truss structure is provided. Is composed. In order to reinforce such a truss structure, a truss buckling prevention, a truss vibration prevention and the like are appropriately mounted.
[0018]
These split roof units 22 and 22 and split trusses 17 and 17 are connected to nodes 19 and 19 of the lower chords 16 and 16 which are joints between the lower chord 16 and the truss bundle 18 in each split truss 17 and 17. Through the joint hardware 20 that is attached across the bridge, the roof unit 21 or the roof truss beam 13 is joined and integrated. The joining ties 41 are also attached to the joints 40, 40 of the upper chords 28, 28, which are joints between the upper chord 28 and the truss bundle 18 in the split truss 17, 17, respectively. The roof units 22, 22 and the split trusses 17, 17 can be joined and integrated in a stable state.
[0019]
According to the present embodiment, as shown in FIGS. 3A, 3B and 4, the joint hardware 20 includes the joint portions 19 of the lower chord members 16, 16 of the pair of split trusses 17, 17. The bolt fastening members 23 are mounted on the bolt 19 in advance, and the bolt members 24 are fastened across the bolt fastening members 23.
[0020]
Further, according to the present embodiment, the bolt fastening members 23, 23 are located at symmetrical positions on the side surfaces on both sides of the lower chord members 16, 16 at the joint portions 19, 19 of the pair of split trusses 17, 17, respectively. Both front and back are attached. The pair of front and back bolt fastening members 23, 23 are connected via a flat bar 35 as a bridging member that vertically intersects with the lower chord members 16, 16, and on both sides of the lower chord members 16, 16. The arranged pair of bolt members 24 are fastened over the pair of front and back bolt fastening members 23, 23, respectively.
[0021]
Further, according to the present embodiment, the bolt fastening members 23 have the additional fixing plates 31, and the bolt fastening members 23 are connected via the additional fixing plates 31. The lower chord members 16, 16 will be attached to both side surfaces. At each of the joint portions 19, 19, a plurality of fixing screws or bolts 34, for example, as plate fixing rod-like members penetrating the lower chord members 16, 16 are mounted by straddling a pair of front and back attached fixing plates 31, 31. As a result, the pair of front and back bolt fastening members 23, 23 are fixed to the respective node portions 19, 19 of the lower chord members 16, 16 by a two-sided shear structure.
[0022]
According to the present embodiment, each of the bolt fastening members 23 is a metal member, and as described above, the horizontally-long rectangular attached fixing plate 31 and the joining portion of the attached fixing plate 31. And a fastening pedestal 32 having a U-shaped cross section that is welded and fixed to one end on the side.
[0023]
The attached fixing plate 31 has, for example, a horizontally long rectangular shape having a length of about 150 to 600 mm and a width of about 60 to 140 mm, and has a plurality of screw or bolt insertion holes that are aligned and arranged in the vertical and horizontal directions. By arranging the attached fixing plate 31 along the lower edge of the lower chord material 16 at the joint 19 and tightening the fixing screw or bolt 34, a pair of bolts is tightened on the front and back sides of the lower chord material 16. The attaching members 23 are respectively attached. That is, the lower chord member 16 is inserted by inserting a plurality of fixing screws or bolts 34 into the respective screw or bolt insertion holes while penetrating the lower chord member 16, and tightening them so as to straddle the pair of attached fixing plates 31, 31. A pair of bolt fastening members 23 are firmly fixed to the front and back sides of the sandwiched node portion 19 via the fixing plate 31. As a result, the pair of front and back bolt fastening members 23, 23 are fixed to the respective node portions 19, 19 of the lower chord members 16, 16 by a two-sided shear structure.
[0024]
The fastening pedestal 32 protrudes the center fastening flange portion 33 (see FIG. 4), in which the bolt fastening hole 38 is formed, outward from the end of the attached fixing plate 31 toward the other split truss 17 to be joined. It is integrally joined to the attached fixing plate 31 in a state where it is arranged in a state and the opening side of the U-shaped cross section is arranged to face the side opposite to the other divided truss 17 to be joined. On the back side of the central fastening flange portion 33, flat bars 35 are attached at the portions protruding outward from the attached fixing plate 31 along the end surfaces of the lower chord members 16, 16 so as to intersect perpendicularly with the end surfaces. The pair of bolt fastening members 23, 23 are inserted and arranged across the fastening pedestals 32, 32. When the bolt member 24 is fastened between the pair of split trusses 17, the pair of front and back bolt fastening members 23 are connected to each other via the flat bar 35.
[0025]
The bolt member 24 has a considerable thickness of, for example, about 12 to 20 mm in diameter. As a result, the bolt member 24 is connected to the pair of split roof units 22 and 22 and the pair of split trusses 17 and 17 to form the roof unit 21 and the roof truss beam 13, and the bolt member 24 is mounted on the pair of wall structures 15 on both sides. Even when a considerable amount of tensile bending stress is applied to the nodal points 19, 19 located at the center between the fulcrums on both sides, the connection state of the split truss 17, 17 due to this bending stress is changed. It will exhibit sufficient tensile strength to resist the load that is about to separate.
[0026]
Further, the bolt member 24 is bolted so as to straddle a central fastening flange portion 33 disposed opposite to the bolt fastening members 23 fixed to the joint portions 19 of the pair of split trusses 17. It is inserted into the hole 38 and the bolt fastening hole of the flat bar 35, and is fastened to the bolt fastening hole 38 while being fastened and supported by the flat bar 35. A pair of bolt members 24 are arranged on both sides of the lower chord member 16, and each of the bolt members 24 is tightened over a pair of bolt fastening members 23 on both the front side and the back side of the node portions 19, 19. Accordingly, the pair of truss bundles 18 arranged in parallel are brought into close contact with each other, and the pair of split trusses 17 are firmly connected and integrated.
[0027]
Further, an auxiliary nut 36 is attached to a portion of the bolt member 24 located between the central fastening flange portions 33, 33. After the bolt member 24 is fastened to the bolt fastening members 23, 23, an auxiliary nut 36 is attached. By tightening the nut 36 toward each of the central fastening flange portions 33, 33, loosening of the tightened bolt member 24 can be effectively prevented, and a strong connection state can be maintained. At the same time, it is possible to resist not only the tensile force but also the axial force in the compression direction.
[0028]
In addition, according to this embodiment, the corner portion of each node portion 19 where the central fastening flange portion 33 of the fastening pedestal 32 is located so as to protrude outward from the end portion of the attached fixing plate 31 has a rectangular shape. The notch 37 is cut out, and through this notch 37, the work of attaching the flat bar 35 and the work of fastening the bolt member 24 can be performed smoothly.
[0029]
According to the present embodiment, the split roof units 22, 22 into which the split trusses 17, 17 are assembled are efficiently and accurately assembled in a factory or the like in advance, and the assembled split roof units 22, 22 are transported. And transported to the construction site. Here, the split roof units 22, 22 are joined and integrated to form a large-span roof unit 21, and are installed on the roof portion 10 in a stable state in one span. According to the above, the roof unit 21 into which the roof truss beams 13 are incorporated is divided into two by the split roof units 22, 22 into which the split trusses 17, 17 are incorporated, and is conveyed in a compact shape. There is no hindrance to transport work.
[0030]
The split roof units 22 and 22 conveyed to the building construction site are each lifted using a lifting heavy machine such as a crane, and are placed above the wall structure 15 on which the roof unit 21 and the roof truss beams 13 are installed. It is conveyed, joined and integrated as a roof unit 21 above the wall structure 15, and installed on the wall structure 15. That is, the pair of split roof units 22, 22 conveyed above the wall structure 15 connect the joint portions 19, 19 of the lower chord members 16, 16 via the joint hardware 20, and form the split roof units 22, 22. After the pair of split roof units 22 and 22 arranged on both front and rear sides are joined and integrated, the pair of split roof units 22 and 22 are joined and integrated, and then both ends are supported by the wall structure 15 and integrated. The roof unit 21 is installed. Further, in a state where one end of each divided roof unit 22, 22 is placed on and supported by the upper end of the wall structure 15, the joint portions 19, 19 located at the other end in the center of the wall structure 15 on both sides. Connection work may be performed.
[0031]
As described above, the pair of split trusses 17 and 17 and the pair of split roof units 22 and 22 are connected and integrated above the wall structure 15 and installed on the roof portion 10 as the roof truss beams 13 and the roof unit 21. Therefore, it is not necessary to provide a work yard for joining and integrating them at the construction site, and a process of temporarily placing the pair of split trusses 17, 17 and the pair of split roof units 22, 22 in the work yard is required. The roof truss beam 13 and the roof unit 21 conveyed from a factory or the like can be directly and quickly installed on the roof portion 10 without having to do so.
[0032]
Further, according to the present embodiment, the bolt fastening members 23 of the joint hardware 20 are mounted on a pair of front and back sides at symmetrical positions with respect to each of the joint portions 19, 19. 23 are connected to each other via the flat bar 35, so that the bending moment generated at the jointed portions 19, 19 to be joined and integrated is effectively processed, and the pair of split trusses 17, 17, in a stable state. Can be joined and integrated. In other words, for example, when the bolt member 24 is fastened by attaching the bolt fastening member 23 to only one side surface of the lower chord material 16, the bolt is not connected when the axial force of the lower chord material 16 is transmitted to the joint hardware 20. Due to the fact that the fastening axis of the member 24 is offset from the axis of the lower chord material 16, the bending moment may not be handled well.
[0033]
On the other hand, according to the present embodiment, the metal fittings 20, 20 are arranged in a pair at positions symmetrical with respect to the axis of the lower chord material 16, and the pair of front and back bolt fastening members 23, 23 are flat bar. Because the flat bar 35 is interposed when the axial force of the lower chord member 16 is transmitted to the metal joint 20, the fastening shaft of the bolt member 24 is offset from the axis of the lower chord member 16. No rotational force is generated due to the rotation. In addition, since the pair of metal fittings 20 and 20 are disposed at positions symmetrical with respect to the axis of the lower chord material 16, the fastening direction by the pair of bolt members 24 and the axial direction of the lower chord material 16 coincide with each other, so that stability is obtained. In this state, the pair of split trusses 17 can be joined and integrated.
[0034]
Further, according to the present embodiment, the pair of front and back bolt fastening members 23, 23 are attached to the respective node portions 19, 19 of the lower chord members 16, 16 via the attached fixing plates 31, 31 by a two-sided shear structure. Since each is fixed, it is possible to strongly resist even a considerable amount of axial force of about several tons applied to the lower chord of the roof truss beam 13 and to provide a pair of split trusses 17. Since the nodal points 19, 19 of the lower chord members 16, 16 are joined via the bolt members 24, the intervals can be freely adjusted.
[0035]
In addition, when the pair of split trusses 17 are joined and integrated, a tensile load for separating the pair of trusses 17 mainly occurs at the joints of the joint portions 19 of the lower chord members 16. By firmly joining the nodes 19, 19 with the joint hardware 20, a stable roof truss beam 13 and a roof unit 21 can be obtained. For example, the nodes of the upper chords 28, 28 can be obtained. The split roof units 22 and 22 are also attached to the pair of truss bundles 18 and 18 using a plywood gusset or the like by attaching the joining ties 41 to the joints 40 and 40, respectively. And the split truss 17, 17 can be joined and integrated in a more stable state.
[0036]
When the roof truss beams 13 and the roof unit 21 are installed on the roof portion 10, subsequently, other roof units, a roof panel as a roof base material, a roof finishing material, and the like are mounted, and a unit house is installed. The construction of the roof part 10 is completed.
[0037]
According to the present embodiment, as described above, the roof truss beam 13 formed in advance and the roof unit 21 incorporating the same can be formed in one span at the building construction site without any trouble in transportation. In a stable state, it is possible to easily install and install on the roof portion 20.
[0038]
It should be noted that the present invention is not limited to the above embodiment, and various changes can be made. For example, a roof truss beam does not necessarily need to be incorporated into a roof unit and installed on the roof. You can also attach. In addition, the present invention is not limited to the ridge roof, and can be adopted for roof structures of various other shapes having a ridge, and roof truss beams arranged at both ends of the ridge roof. It can also be applied to roof units. In this case, a roof truss beam having a truncated triangular (for example, trapezoidal) front shape can be used. Further, as the metal joint, a member having a structure other than the structure including the bolt fastening member and the bolt member can be used. After joining and integrating in a yard or the like, it may be lifted and installed on the roof. Furthermore, the present invention can be applied without being limited to unit housing.
[0039]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the installation structure and installation method of the roof truss beam of the present invention, the pre-formed roof truss beam and the roof unit incorporating the same can be used for one span at a building construction site without hindering transportation. In a stable state, it can be easily installed on the roof.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an example of a residential building to which a roof truss beam installation structure and an installation method of the present invention are adopted.
FIG. 2 is a front view illustrating an installation structure of a roof truss beam of the present invention.
FIG. 3A is a partial front view showing a state in which a pair of split trusses are joined and integrated by a metal joint, and FIG. 3B is a top view of FIG. 3A as viewed from AA.
FIG. 4 is a perspective view illustrating a mounting state of a metal joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Roof part 11 Unit house 12 Building 13 Roof truss beam 15 Wall structure 16 Lower chord material 17 Split truss 18 Truss bundle material 19 Joint part 20 Joining hardware 21 Roof unit 22 Split roof unit 23 Bolt fastening member 24 Bolt member 28 Upper chord material 29 Truss bundled material 30 Intermediate truss bundled material 31 Attached fixing plate 32 Fastening pedestal 33 Central fastening flange 35 Flat bar (bridge member)
37 Notch part 38 Bolt fastening hole X perpendicular

Claims (6)

A roof truss beam, which is arranged along a plane perpendicular to the building and forms a framework of the roof portion of the house building, is supported by the wall structure of the house building and installed on the roof portion. Installation structure,
The roof truss beam is constituted by a pair of left and right split trusses divided into two parts by a perpendicular line dropped from the top to the bottom chord of the bottom chord,
At the time of installation of the roof truss beams, the pair of split trusses is attached to the lower chord members of the pair of chords through a joint metal member that is attached to the joint portions and resists a load that tries to separate the connection state at the joint portions. Installation structure of roof truss beams characterized by joining and integrating split trusses. The roof truss beam is incorporated in a roof unit formed in a shape occupying a region obtained by dividing a roof portion of a house into a plurality of sections by a dividing plane in a direction perpendicular to the ridge, and arranged along the dividing plane. The roof truss beam installation structure according to claim 1, wherein the roof unit is divided into a pair of left and right divided roof units by a vertical surface along the perpendicular line that divides the roof truss beam into two. The joint hardware includes a bolt fastening member previously attached to each node portion of the lower chord member of the pair of split trusses, and a bolt member fastened across these bolt fastening members. The installation structure of the roof truss beam according to claim 1 or 2. The bolt fastening member is attached to a pair of front and back sides at positions that are symmetrical on both side surfaces across the lower chord material at each node portion, and the pair of front and back bolt fastening members are perpendicular to the lower chord material. Are connected via a bridging member that intersects with each other, and a pair of the bolt members arranged on both sides of the lower chord member are fastened over the pair of front and back bolt fastening members. The installation structure of a roof truss beam according to claim 3. The bolt fastening member has an attached fixing plate, and is attached to both side surfaces of the lower chord material via the attached fixing plate. By attaching a plate fixing rod-shaped member such as a screw, a bolt, a screw, or a nail that penetrates the lower chord material across the plate, the pair of bolt fastening members on the front and back sides is connected to each node portion of the lower chord material by a two-sided shear structure. The roof truss beam installation structure according to claim 4, wherein the roof truss beam is fixed to the roof truss beam. A roof truss beam installation method applied to the roof truss beam installation structure according to any one of claims 1 to 5,
Each of the pair of split trusses or the pair of split roof units is lifted and transported above the wall structure of the residential building,
Above the wall structure, the joint portions of the lower chord members of the split truss are connected via the joint hardware, and the pair of split trusses or the pair of split roof units are joined and integrated, and the wall structure is connected to the wall structure. A method for installing a roof truss beam, wherein the roof truss beam or the roof unit is installed on a roof portion with both ends supported.

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