Skeleton joining structure and method

Abstract

To provide a skeleton joining structure and method capable of properly joining wood surface materials to steel beams and other skeletons using connecting members that replace small-diameter studs.SOLUTION: The skeleton joining structure includes: a skeleton (2) that is a long steel material that has a flange (21) formed with a bolt insertion hole (210); a wood surface material (4) with a through hole (5) at the position corresponding to the bolt insertion hole; a bolt (31) that is passed through the bolt hole and fixed to a flange; and an adhesive material that is filled in the through-hole (6) with the bolt inserted into the through hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure and method for joining a skeleton, and more particularly to a composite beam structure in which a wooden surface material is joined to a steel beam, which is a long steel material, and a construction method thereof. [Background technology]

[0002] There is a technology called composite beams, which connect steel beams and reinforced concrete floors using a connecting member called a shear key (mechanical shear stop). This technology is very efficient because the steel beams resist tension forces and the reinforced concrete slab resists compression forces.

[0003] In recent years, cross-laminated timber (CLT) has been attracting attention as a building material, and as disclosed in JP 2019-027198 A (Patent Document 1), there are also composite beams made by joining steel beams and cross-laminated timber. Cross-laminated timber is a wood surface material made by arranging sawn boards with their grain directions parallel to each other and then laminating and gluing them together so that the grain directions are perpendicular to each other, and is lightweight and has excellent strength. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-027198 Summary of the Invention [Problem to be solved by the invention]

[0005] As shown in Patent Document 1, the joint members (shear keys) used in composite beams are composed of cylindrical studs. Specifically, a composite beam is formed by inserting a large number of cylindrical studs welded to a steel beam into through holes formed in a wooden panel, and then filling the through holes with resin (adhesive) and allowing it to harden. The welding of the large number of studs is generally performed on-site.

[0006] However, studs are small in diameter, and welding them to steel beams at a constant pitch requires skilled techniques. Given concerns about a shortage of skilled workers in the near future, it is irrational to use studs as joining materials.

[0007] The present invention has been made to solve the above-mentioned problems, and its purpose is to properly join wood paneling to structural parts such as steel beams using joining members that replace small-diameter studs. [Means for solving the problem]

[0008] A joining structure for a body part according to one aspect of the present invention comprises a body part which is a long steel material and has a flange with a bolt insertion hole formed therein, a wood panel having a through hole formed at a position corresponding to the bolt insertion hole, a bolt which is passed through the bolt insertion hole and fixed to the flange, and an adhesive material which is filled into the through hole with the bolt fitted into the through hole.

[0009] The bolts may be fixed so that the protruding dimension of the bolts at the longitudinal end portions of the body is greater than the protruding dimension of the bolts at the longitudinal center portion of the body, or the bolts may be fixed so that the arrangement pitch of the bolts at the longitudinal end portions of the body is smaller than the arrangement pitch of the bolts at the longitudinal center portion of the body.

[0010] A joining structure for a body part according to another aspect of the present invention comprises a body part which is a long steel material and has a flange with a bolt insertion hole; a wooden panel with a through hole at a position corresponding to the bolt insertion hole; a base board which is overlaid on the surface of the wooden panel and has a hole portion which communicates with the through hole; bolts which are inserted into the bolt insertion hole, the through hole, and the hole portion; and fixing members which screw onto the bolts and tighten and fix the flange and the wooden panel.

[0011] Preferably, the bolt is a high-strength bolt having a head, and a base board is interposed between the wood surface material and the head.

[0012] The wood panel may have a recess to accommodate the base board and head.

[0013] In this joint structure, the bolts may also be arranged so that the arrangement pitch of the bolts at the longitudinal end portions of the body portion is smaller than the arrangement pitch of the bolts at the longitudinal center portion of the body portion.

[0014] A method for joining body parts according to yet another aspect of the present invention includes the steps of preparing a body part having a flange with bolt insertion holes and a wooden panel having a through hole at a position corresponding to the bolt insertion hole, a fixing step of passing a bolt through the bolt insertion hole and fixing the bolt to the flange, an attachment step of fitting the bolt into the through hole and attaching the wooden panel to the body part, and an adhesive step of filling the through hole with an adhesive material and integrating the body part and the wooden panel via the bolt.

[0015] A method for joining body parts according to yet another aspect of the present invention includes the steps of preparing a body part having a flange with bolt insertion holes and a wooden panel having through holes at positions corresponding to the bolt insertion holes and having a base board adhered to its surface, an aligning step of aligning the through holes in the wooden panel with the bolt insertion holes, and a fixing step of passing bolts through the through holes and the bolt insertion holes and tightening and fixing the flange and the wooden panel. [Effects of the Invention]

[0016] According to the present invention, by using bolts, it is possible to properly join wood panels to steel frameworks without using studs, which require spot welding. Furthermore, compared to joining methods using studs, workability is improved. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view schematically showing the structure of a composite beam according to a first embodiment of the present invention. [Figure 2] 1 is a side view of a steel beam in accordance with the first embodiment of the present invention, schematically showing an example of bolt arrangement. [Figure 3] 1 is a cross-sectional view of a steel beam in accordance with the first embodiment of the present invention, and schematically shows a bolt fixing structure. [Figure 4] 1 is a cross-sectional view of a wood surface material according to a first embodiment of the present invention. [Figure 5] 1 is a cross-sectional view schematically showing a construction procedure for a composite beam according to embodiment 1 of the present invention. [Figure 6] 1 is a cross-sectional view schematically showing a construction procedure for a composite beam according to embodiment 1 of the present invention. [Figure 7] FIG. 2 is a cross-sectional view schematically showing a method for dismantling a composite beam according to the first embodiment of the present invention. [Figure 8] 1 is a side view of a steel beam in accordance with the first embodiment of the present invention, schematically showing a state in which the protruding length of a bolt has been adjusted. [Figure 9] FIG. 10 is a cross-sectional view schematically showing the structure of a composite beam according to a second embodiment of the present invention. [Figure 10] 10 is a plan view (top view) of a composite beam according to a second embodiment of the present invention. [Figure 11] FIG. 10 is an exploded cross-sectional view of a composite beam according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a cross-sectional view schematically showing another structure of a composite beam according to embodiment 2 of the present invention. [Figure 13] FIG. 10 is a cross-sectional view schematically showing the structure of a composite beam 1B according to a modified example of the second embodiment of the present invention. [Figure 14] 10 is a plan view (top view) that schematically shows a composite beam 1B according to a modified example of the second embodiment of the present invention. [Figure 15] FIG. 1 is an exploded perspective view schematically illustrating the structure of a known composite beam. [Figure 16] FIG. 1 is a cross-sectional view schematically showing a known method for constructing a composite beam. [Figure 17] FIG. 1 is a cross-sectional view schematically showing a known method for constructing a composite beam. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0019] In this embodiment, a "composite beam" structure (joint structure of steel beams) in which wooden surface materials are joined to steel beams will be described.

[0020] Before proceeding to a detailed description of the composite beam according to this embodiment, a known composite beam using wooden paneling will be briefly described with reference to Figures 15 to 17. In these figures, the longitudinal direction of the steel beam is indicated by arrow A1, and the width direction of the steel beam (the direction perpendicular to the longitudinal direction) is indicated by arrow A2. This also applies to the other figures.

[0021] As shown in Figure 15, a known composite beam 100 includes a steel beam 120 to which numerous small-diameter studs 130 are welded and fixed, and a wooden panel 140 with numerous round holes 150. The steel beam 120 is an H-shaped steel having an upper flange 121, a lower flange 122, and a web 123 extending in the vertical direction between the upper flange 121 and the lower flange 122. The stud 130 is spot-welded to the upper surface (joint surface) of the upper flange 121 so as to protrude upward from the upper flange 121.

[0022] When constructing the composite beam 100, as shown in Figure 16, the studs 130 protruding upward from the upper flange 121 are inserted into the round holes 150, and the wooden panel 140 is placed on the upper flange 121. In this state, as shown in Figure 17, resin 160 is filled into the round holes 150 and the resin 160 is allowed to harden. This completes the composite beam 100.

[0023] In such a known composite beam 100, in order for the small-diameter studs 130 to function properly as force transmission members, the studs 130 must be spot welded to the upper flange 121 at a fine pitch along the longitudinal direction of the steel beam 120 (and also in the width direction), and it is difficult to fix the studs 130 accurately without skilled techniques.

[0024] Therefore, the main feature of this embodiment is that bolts that can be easily fixed to steel beams are used as joining members for the composite beams.

[0025] [Embodiment 1] <Outline of composite beam structure> A schematic configuration of a composite beam 1 according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view that schematically shows the structure of the composite beam 1 (the joint structure of steel beams 2).

[0026] The composite beam 1 comprises a steel beam 2 having an upper flange 21 with a bolt insertion hole 210, a wooden panel 4 with a through hole 5 at a position corresponding to the bolt insertion hole 210, a bolt 31 passed through the bolt insertion hole 210 and fixed to the upper flange 21, and an adhesive material 6 filled in the through hole 5 with the bolt 31 fitted in the through hole 5.

[0027] The steel beam 2 is an H-shaped steel beam having an upper flange 21, a lower flange 22, and a web 23 extending vertically between the upper flange 21 and the lower flange 22. The wooden panel 4 is typically a cross-laminated timber board. The wooden panel 4 forms the floorboards of a building such as an office. The overall thickness L11 (Fig. 4) of the wooden panel 4 is, for example, approximately 100 mm to 300 mm.

[0028] <Bolt fixing structure and layout example> The fixing structure and arrangement example of the bolts 31 will be described with reference to Figures 2 and 3. Figure 2 is a side view of the steel beam 2, and shows a schematic example of the arrangement of the bolts 31. Figure 3 is a cross-sectional view of the steel beam 2 cut along line III-III in Figure 2, and shows a schematic example of the fixing structure of the bolts 31.

[0029] The bolt 31 is typically a cut bolt having a certain length. The diameter φ of the bolt 31 is typically equal to the diameter of the stud 130 described above, and falls within the range of 10 mm to 15 mm, for example.

[0030] As shown in Fig. 3, the bolts 31 are arranged in two rows on the upper flange 21. That is, the upper flange 21 has bolt insertion holes 210 on both the left and right sides of the web 23 as the center, and a bolt 31 is inserted into each bolt insertion hole 210. Each bolt 31 is fixed to the upper flange 21 by a pair of nuts 32, 33 that screw onto the bolt 31. The nuts 32, 33 are fixing members that fix the bolt 31. A washer 34 may be interposed between each nut 32, 33 and the upper flange 21.

[0031] As shown in Fig. 2, a plurality of bolts 31 are arranged at a constant pitch P1 in the longitudinal direction of the steel beam 2. In this embodiment, the plurality of bolts 31 are arranged in a matrix along the longitudinal and width directions of the steel beam 2. The arrangement pitch P1 of the bolts 31 is, for example, 50 to 100 mm. Alternatively, the plurality of bolts 31 may be arranged in a staggered pattern.

[0032] The protrusion dimension L1 (FIG. 3) of the bolt 31 based on the top surface (joint surface) of the upper flange 21 is less than the thickness dimension L11 (FIG. 4) of the wooden surface material 4, and is, for example, about 80 mm to 120 mm.

[0033] <About through holes in wood paneling> The through holes 5 provided in the wooden panel 4 will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view of the wooden panel 4 having the through holes 5.

[0034] The through hole 5 is a round hole that penetrates the wood panel 4 in the thickness direction. The through hole 5 has an upper portion 51 that receives the protruding portion of the bolt 31 (the portion above the upper nut 32), and a lower portion 52 that receives the upper nut 32. The lower end surface of the wood panel 4 is countersunk so that the diameter of the lower portion 52 is larger than the diameter of the upper portion 51.

[0035] The diameter of the upper portion 51 is larger than the diameter of the bolt 31 and smaller than the diameter of the nut 32. The diameter of the lower portion 52 is larger than the diameter of the nut 32.

[0036] <Construction method of composite beams> A method for constructing the composite beam 1 (a method for joining the steel beams 2) in this embodiment will be described with further reference to Figures 5 and 6. Figures 5 and 6 are cross-sectional views that schematically show the procedure for constructing the composite beam 1.

[0037] The construction method of the composite beam 1 includes a "drilling process" in which bolt insertion holes 210 are drilled in the upper flange 21 of the steel beam 2 and through holes 5 are drilled in the wooden panel 4, a "fixing process" in which bolts 31 are fixed to the steel beam 2, an "installation process" in which the wooden panel 4 is attached to the steel beam 2, and a "bonding process" in which the steel beam 2 and the wooden panel 4 are integrated with an adhesive material 6.

[0038] The drilling process is carried out in a factory. In this case, after preparing the steel beams 2 with the bolt insertion holes 210 and the wooden panel 4 with the through holes 5, the fixing process, the mounting process, and the bonding process are carried out in this order on site.

[0039] In the fixing process, bolts 31 are passed through all of the bolt insertion holes 210 provided in the upper flange 21 of the steel beam 2, and the bolts 31 are fixed with upper nuts 32 and lower nuts 33. The upper flange 21 is clamped between the upper nuts 32 and the lower nuts 33. In this embodiment, the protrusion dimensions L1 (FIG. 3) of all of the bolts 31 are adjusted to be constant in both the longitudinal and width directions of the steel beam 2, and then fixed.

[0040] To simplify the fixing work in the fixing process, lower nuts 33 may be temporarily fastened in advance at a factory or the like to the back surface of upper flange 21. Also, to make it easier and more accurate to adjust the protruding length of bolt 31, the fixing points of upper nuts 32 on the shanks of bolts 31 may be marked in advance at a factory or the like.

[0041] Although the present embodiment has been described with reference to an example in which the fixing step is performed on-site, the fixing step may be performed in advance in a factory or the like.

[0042] In the installation process, as shown in Figures 5 and 6, the wooden panel 4 is lifted above the steel beam 2, the through-hole 5 is aligned with the position of the bolt 31, and the bolt 31 and upper nut 32 are fitted into the through-hole 5. In this way, the wooden panel 4 is installed on the steel beam 2. In the installed state, the upper surface of the upper flange 21 of the steel beam 2 and the lower surface of the wooden panel 4 are in surface contact. The wooden panel 4 is supported (temporarily placed) from below by multiple steel beams 2.

[0043] In the bonding process, with the wooden panel 4 attached to the steel beam 2, adhesive material 6 (Fig. 1) is filled into the through-hole 5. The adhesive material 6 is typically a thermosetting resin (epoxy resin). When the resin hardens, the bolt 31 (and upper nut 32) and the wooden panel 4 are strongly bonded, thereby integrating the steel beam 2 and the wooden panel 4. In this way, the composite beam 1 shown in Fig. 1 is completed.

[0044] As explained above, the composite beam 1 according to this embodiment uses the bolts 31 as connecting members, which eliminates the need for welding work required for the known composite beam 100, improving workability. In addition, since the bolts 31 and nuts 32 are commercially available products, it is also possible to reduce the cost of the composite beam 1.

[0045] Furthermore, because the bolt 31 is fixed to the steel beam 2 by a pair of upper and lower nuts 32, 33, the composite beam 1 can be dismantled when rebuilding a building, for example. Specifically, by loosening and removing the lower nut 33 from the bolt 31, the wood panel 4 integrated with the bolt 31 and nut 32 can be separated from the steel beam 2, as shown in Figure 7. Therefore, the joint structure of the composite beam 1 according to this embodiment makes it possible to reuse the steel beam 2.

[0046] Furthermore, by using bolts 31 as joining members, it is possible to easily adjust the protruding length from the upper flange 21. For example, as shown in Fig. 8, the protruding dimension L1a of the bolt 31 fixed to the longitudinal end 2a of the steel beam 2 may be made larger than the protruding dimension L1b of the bolt 31 fixed to the longitudinal center 2b of the steel beam 2.

[0047] In this case, the joint strength between the steel beam 2 and the wooden surface material 4 at its longitudinal end 2a can be made higher than the joint strength between the steel beam 2 and the wooden surface material 4 at its longitudinal center 2b, thereby preventing warping (lifting) that tends to occur at the end 4a of the wooden surface material 4 as shown by the imaginary line in Figure 8.

[0048] 2, the bolts 31 are arranged at a constant pitch P1, but the arrangement pitch of the bolts 31 does not have to be constant. For example, the arrangement pitch of the bolts 31 at the longitudinal end 2a of the steel beam 2 may be smaller than the arrangement pitch of the bolts 31 at the longitudinal center 2b of the steel beam 2. In other words, the density of the bolts 31 at the longitudinal end 2a of the steel beam 2 may be greater than the density of the bolts 31 at the longitudinal center 2b of the steel beam 2.

[0049] [Embodiment 2] <Outline of composite beam structure> The schematic configuration of a composite beam 1A according to embodiment 2 of the present invention will be described with reference to Figures 9 and 10. Figure 9 is a cross-sectional view schematically showing the structure of the composite beam 1A. Figure 10 is a plan view (top view) of the composite beam 1A.

[0050] The composite beam 1A comprises a steel beam 2 having an upper flange 21 with a bolt insertion hole 210, a wooden panel 4 with a through hole 5A at a position corresponding to the bolt insertion hole 210, a base board 7 placed on the surface (top surface) of the wooden panel 4 and having a hole 70 communicating with the through hole 5A, a bolt 36 inserted through the bolt insertion hole 210, the through hole 5A, and the hole 70, and a nut 37 threaded onto the bolt 36. The nut 37 is a fixing member for fastening the upper flange 21 and the wooden panel 4 together. The composite beam 1A according to this embodiment does not require adhesive materials such as resin.

[0051] The basic configuration of the composite beam 1A is the same as that of the composite beam 1 of the first embodiment, so only the parts that differ from the composite beam 1 of the first embodiment will be described in detail here.

[0052] As shown in Figure 9, the bolt 36 is typically a high-strength bolt having a head (hereinafter referred to as "bolt head") 36h. In the installed state, a base board 7 is interposed between the wood panel 4 and the bolt head 36h. A nut 37 is threaded onto the lower end of the bolt 36, and the nut 37 is pressed against the back surface of the upper flange 21. In order to maintain the tightening force of the bolt 36 and the nut 37, it is desirable to interpose a washer 34 at least one way between the bolt head 36h and the base board 7 and between the nut 37 and the lower flange 22.

[0053] Because only the shank of the bolt 36 is passed through the wood panel 4, the through hole 5A in this embodiment has a constant diameter and extends straight from the upper end to the other end. The diameter of the through hole 5A may be slightly larger than the shank of the bolt 36, and there is no need for an intentional gap to be filled with the adhesive material 6 as shown in the first embodiment.

[0054] As shown in FIG. 10, the base plate 7 is a piece of steel plate provided at each arrangement pitch (P1) of the bolts 36. The base plate 7 is provided commonly for two bolts 36 adjacent in the width direction. Each base plate 7 has a rectangular shape that is long in the width direction of the steel beam 2, and has two holes 70. It is desirable that the width dimension (longitudinal length) of the base plate 7 is equal to or greater than the lateral dimension of the upper flange 21. In this embodiment, both widthwise ends of the base plate 7 protrude on both sides in the width direction beyond the arrangement range of the upper flange 21.

[0055] The base board 7 is preferably adhered to the surface (top surface) of the wooden panel 4 with an adhesive or the like, and is integrated with the wooden panel 4. The thickness of the base board 7 is not particularly limited, but is expected to be equal to or slightly larger than the thickness of the flanges 21, 22 of the steel beam 2.

[0056] <Construction method of composite beams> A method for constructing a composite beam 1A (a method for joining steel beams 2) in this embodiment will be described with further reference to Fig. 11. Fig. 11 is an exploded cross-sectional view of the composite beam 1A.

[0057] The construction method for the composite beam 1A includes a "drilling process" in which bolt insertion holes 210 are drilled in the upper flange 21 of the steel beam 2 and through holes 5A are drilled in the wooden surface material 4, an "alignment process" in which the through holes 5A in the wooden surface material 4 are aligned with the bolt insertion holes 210 in the steel beam 2, and a "tightening and fixing process" in which the wooden surface material 4 is tightened and fixed with bolts 36 and nuts 37.

[0058] In this embodiment, the hole drilling step is also carried out in a factory. It is also desirable that the work of adhering the base board 7 to the wooden panel 4 is also carried out in a factory. In this case, after preparing the steel beam 2 with the bolt insertion holes 210 and the wooden panel 4 with the through holes 5 and the base board 7 adhered thereto, the alignment step and the fixing step are carried out in this order on site.

[0059] In the positioning process, the wooden panel 4 is lifted above the steel beam 2, and the positions of the through holes 5A (and hole portions 70) are aligned with the positions of the bolt insertion holes 210, and the wooden panel 4 is placed on the upper flange 21 of the steel beam 2. In this state, the upper surface of the upper flange 21 of the steel beam 2 and the lower surface of the wooden panel 4 are in surface contact. The wooden panel 4 is supported (temporarily placed) from below by multiple steel beams 2.

[0060] In the fixing process, a bolt 36 is inserted from above the aligned wooden panel 4. The shaft of the bolt 36 passes through the hole 70 in the base board 7, the through-hole 5A in the wooden panel 4, and the bolt insertion hole 210 in the upper flange 21, in that order. As shown in FIG. 9, the lower end of the bolt 36 protrudes below the upper flange 21. A nut 37 is threaded onto this portion (lower end), and the bolt head 36h and the nut 37 tighten and secure the upper flange 21 and the wooden panel 40. As a result, the wooden panel 4 is sandwiched between the steel beam 2 and the base board 7, and the steel beam 2 and the wooden panel 4 are integrated. In this way, the composite beam 1A shown in FIG. 9 is completed.

[0061] In this embodiment as well, to simplify the fixing work in the fixing process, nuts 37 may be temporarily fastened in advance at a factory or the like to the back surface of upper flange 21. Furthermore, although bolts 36 are preferably high-strength bolts having heads 36h, they may also be cut bolts as in embodiment 1, and the fixing member may further include an upper nut that is pressed against base plate 7 (not shown).

[0062] According to this embodiment, the wooden surface material can be joined to the steel beam 2 without using adhesive materials such as thermosetting resin, eliminating the need for waiting time until the adhesive material 6 hardens. This reduces the construction time for the composite beam 1A.

[0063] Furthermore, since the base plate 7 is provided in common to two bolts 36 adjacent to each other in the width direction of the steel beam 2, even when two wooden panel materials 41, 42 are butted together in the center of the width direction of the steel beam 2 as shown in Figure 12, the two wooden panel materials 41, 42 can be properly joined to the common steel beam 2.

[0064] Also in this embodiment, the wooden panel 4 can be separated from the steel beam 2 by loosening and removing the nuts 37 from the bolts 36. Therefore, the steel beam 2 can be reused in the joint structure of the composite beam 1A according to this embodiment.

[0065] As shown in Figure 9, even if the base board 7 and bolt head 36h protrude above the surface of the wooden panel 4 in the completed state, in cases where the wooden panel 4 is used as an office floor, it is expected that the space above the wooden panel 4 will be used as a wiring space, and therefore this degree of protrusion is considered to be within the acceptable range.

[0066] <Modification> In cases where the wooden panel 4 is to be used as a floorboard in an ordinary room, a recess may be provided in the surface of the wooden panel 4 so that the base board 7 and bolt heads 36h do not protrude from the surface of the wooden panel 4. An example of the configuration of a composite beam in this case is shown in Figures 13 and 14. Figure 13 is a cross-sectional view that schematically shows the structure of a composite beam 1B according to a modified example of embodiment 2. Figure 14 is a plan view (top view) that schematically shows a composite beam 1B according to a modified example of embodiment 2.

[0067] 13, the wood panel 4 in this modified example has a recess 40 that accommodates the base board 7 and the bolt head 36h. The depth of the recess 40 is determined taking into consideration the thickness of the base board 7 and the bolt head 36h so that the bolt head 36h does not protrude above the surface height of the wood panel 4. The depth of the recess 40 is less than half the overall thickness dimension (L11) of the wood panel 4, and is, for example, approximately 30 mm.

[0068] As shown in Figure 14, in a plan view, the recess 40 is formed to be slightly larger than the base board 7. In other words, a rectangular frame-shaped gap S is provided between the inner wall surface of the recess 40 and the base board 7. By filling the gap S with adhesive material 6, the adhesive strength between the wooden surface material 4 and the base board 7 can be improved, and therefore the joint between the bolt 36 and the wooden surface material 4 can be improved even without filling the through hole 5A of the wooden surface material 4 through which the shank of the bolt 36 passes with adhesive material 6. Another advantage is that the shank length of the bolt 36 can be shortened by the depth of the recess 40.

[0069] In addition, in the composite beam 1A shown in Figure 9, the diameter of the through hole 5A can be made larger than the shaft of the bolt 36, and an injection port (the part that protrudes from the bolt head 36h when viewed from above) connected to the hole portion 70 of the base plate 7 can be provided (not shown), and adhesive material 6 can be filled into the through hole 5A from the injection port.

[0070] <Other examples of the body> In the above-mentioned embodiments, a composite beam 1 (1A, 1B) has been described in which a steel beam 2 and a wooden panel 4 are joined together, but the joining structure of the composite beam 1 can also be applied to joining structures between other structural parts, such as columns, and wooden paneling. The structural parts can be any long steel material that forms the skeleton of the building, and are not limited to H-shaped steel, but can also be, for example, channel steel.

[0071] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0072] 1,1A,1B,100 Composite beam, 102,120 Steel beam, 2a Longitudinal end, 2b Longitudinal center, 4,41,42,140 Wood surface material, 5,5A Through hole, 6 Adhesive material, 7 Base board, 21,121 Upper flange, 22,122 Lower flange, 23,123 Web, 31,36 Bolt, 32,33,37 Nut, 34 Washer, 36h Head, 40 Recess, 70 Hole, 130 Stud, 150 Round hole, 160 Resin, 210 Bolt insertion hole, S Gap.

Claims

1. a body portion that is a long steel material and has a flange with a bolt insertion hole; A wood surface material having a through hole provided at a position corresponding to the bolt insertion hole; a bolt passed through the bolt insertion hole and fixed to the flange; A joining structure for a body portion, comprising: an adhesive material filled in the through hole with the bolt fitted into the through hole.

2. 2. The joining structure of claim 1, wherein a protruding dimension of the bolt at the longitudinal end of the body is greater than a protruding dimension of the bolt at the longitudinal center of the body.

3. The joining structure of claim 1 , wherein the bolts are arranged at a pitch smaller at the longitudinal end portions of the body than at a pitch smaller at the longitudinal center portion of the body.

4. a body portion that is a long steel material and has a flange with a bolt insertion hole; A wood surface material having a through hole provided at a position corresponding to the bolt insertion hole; A base board is placed on the surface of the wood surface material and has a hole portion communicating with the through hole; a bolt inserted through the bolt insertion hole, the through hole, and the hole portion; A joining structure for a main body portion, comprising a fixing member that screws onto the bolt and tightens and fixes the flange and the wooden surface material.

5. The bolt is a high-strength bolt having a head, The joint structure of a framework portion according to claim 4, wherein the base board is interposed between the wooden surface material and the head portion.

6. The joining structure of a structural body according to claim 5 , wherein the wooden surface material has a recess for accommodating the base board and the head portion.

7. The joining structure of a body portion according to claim 5 , wherein the arrangement pitch of the bolts at the longitudinal end portions of the body portion is smaller than the arrangement pitch of the bolts at the longitudinal center portion of the body portion.

8. A step of preparing a body portion having a flange with a bolt insertion hole and a wood surface material having a through hole at a position corresponding to the bolt insertion hole; a fixing step of passing a bolt through the bolt insertion hole and fixing the bolt to the flange; An attachment process of fitting the bolt into the through hole and attaching the wood surface material to the body portion; A method for joining body parts, comprising a bonding step of filling the through hole with an adhesive material and integrating the body part and the wood surface material via the bolt.

9. A step of preparing a body portion having a flange with bolt insertion holes and a wooden surface material having through holes at positions corresponding to the bolt insertion holes and having a base board adhered to the surface; an alignment step of aligning the through holes of the wood surface material with the bolt insertion holes; A method for joining body parts, comprising a fixing step of passing a bolt through the through hole and the bolt insertion hole, and tightening and fixing the flange and the wood surface material.

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