Joint structure between steel beam and wooden floor slab

Abstract

To provide a joint structure between a steel beam and a wooden floor slab, which can easily and smoothly join a peripheral edge of the wooden floor slab integrally to an upper surface of the steel beam.SOLUTION: The joint structure of the present invention comprises a fastening bolt member 13 fixed upright from a top surface of a steel beam 11, and a wooden floor slab 12 having a peripheral portion which rests on the top surface of the steel beam 11 with the fastening bolt member 13 disposed in a notched recess 14 on the peripheral portion. Metal bands 15 are fixed to the underside of the wooden floor slab 12 by fastening portions 15b to fastening areas 12a on both sides of the notched recess 14. A bolt tightening hole 15c is formed in a central portion 15a of the metal band 15, which is positioned facing the notched recess 14, correspondingly to the fastening bolt member 13. A nut member 16 is screwed into a tip side of the fastening bolt member 13, which is erected through the bolt tightening hole 15c, and fastened to the central portion 15a of the metal band 15, thereby integrally joining the peripheral portion of the wooden floor slab 12 to the top surface of the steel beam 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint structure between a steel beam and a wooden flooring, and in particular to a joint structure for integrally joining the peripheral portion of the wooden flooring to the upper surface of the steel beam in a building having a structural portion in which a wooden flooring is installed and supported by a steel beam. [Background technology]

[0002] In recent years, various hybrid buildings that combine wooden and metal materials have been developed. These hybrid buildings may include structural components that are supported by steel beams made of, for example, H-shaped steel beams, with wooden floor slabs made of, for example, cross-laminated timber (CLT) installed on top of the beams, and joined together as a single unit.

[0003] Furthermore, a conventional method for supporting a wooden flooring on a steel beam, placing it on top of the beam, and joining them as a single unit is to fasten the wooden flooring to the top of the steel beam, preferably using stud bolts. In this conventional joining method, a number of stud bolts are attached upright to the top of the steel beam, and a number of stud insertion holes are formed around the periphery of the wooden flooring. The periphery of the wooden flooring is then placed on the top of the steel beam while the stud bolts are inserted into each of the stud insertion holes. Resin is then filled into each of the stud insertion holes with stud bolts and allowed to harden, thereby fixing the peripheral portion of the wooden flooring to the top of the steel beam as a single unit.

[0004] On the other hand, in the above-mentioned conventional method of joining a steel beam and a wooden floor slab using stud bolts, in order to enable the multiple stud bolts erected from the top surface of the steel beam to be simultaneously inserted into each of the multiple stud insertion holes formed in the peripheral part of the wooden floor slab, it is necessary to precisely erect the multiple stud bolts from predetermined positions so that they all align, and to precisely form the multiple stud insertion holes in predetermined positions; if the position of the stud bolt or stud insertion hole is off in even one place, it becomes difficult to support the steel beam and smoothly place the peripheral part of the wooden floor slab on top of it.

[0005] For this reason, a construction method has been disclosed in which the peripheral portion of a wooden floor slab is placed on the top surface of a steel beam, and then a number of stud bolts are inserted into each of a number of stud insertion holes, and then studs are welded to the top surface of the steel beam using a known welding gun, thereby preventing misalignment between the stud bolts and the stud insertion holes (see, for example, Patent Document 1).

[0006] In the construction method described in Patent Document 1, the peripheral portion of the wooden flooring, which has multiple stud insertion holes, is installed on the top surface of the steel beam, with spacers inserted between the steel beam and the wooden flooring to ensure a heat escape route during stud welding (described later). Next, stud bolts with notches in the middle are inserted into the stud insertion holes on the peripheral portion of the installed wooden flooring. Using a device consisting of a known welding gun with a special attachment attached to the tip, which has been improved to enable construction from above thick wooden flooring, the stud bolts are stud-welded to secure the stud bolts standing upright from the top surface of the steel beam. After welding, the portions of the stud bolts protruding above the wooden flooring are cut off via the notches. Then, resin is filled into each of the stud insertion holes where the stud bolts stand and allowed to harden, thereby joining the wooden flooring to the top surface of the steel beam. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-27198 Summary of the Invention [Problem to be solved by the invention]

[0008] However, with the construction method described in Patent Document 1, after the wood floor slabs are installed on the top surfaces of the steel beams, when the stud bolts are stud-welded through the stud insertion holes, it is difficult to visually check the welding points at the base of the stud bolts, which poses a technical problem, as there is a possibility that some stud bolts may be poorly welded.In addition, if poor welding is confirmed or when removing the spacers after stud welding, it is necessary to lift the wood floor slabs, which is time-consuming.

[0009] Furthermore, when filling and hardening resin into each of the stud insertion holes through which multiple stud bolts have been inserted, including in the case of the conventional joining methods described above, it takes a considerable amount of time for the filled resin to harden. Therefore, there is a need for the development of a new technology that makes it possible to more easily and smoothly join the peripheral portion of a wood floor slab as a single unit to the upper surface of a steel beam, without filling and hardening resin into each of the stud insertion holes through which multiple stud bolts have been inserted.

[0010] The present invention aims to provide a joint structure between a steel beam and a wooden flooring that can more easily and smoothly join the peripheral portion of the wooden flooring integrally to the upper surface of the steel beam without filling and hardening resin into each of the stud insertion holes through which the stud bolts are inserted. [Means for solving the problem]

[0011] The present invention relates to a joint structure for integrally joining the peripheral portion of a wood flooring to the upper surface of a steel beam in a building having a structural portion on which a wood flooring is installed and supported by a steel beam, the joint structure comprising a fastening bolt member having a male threaded protrusion on the outer periphery, which is fixed upright from the joint portion with the wood flooring on the upper surface of the steel beam, and the wood flooring, the peripheral portion of which is placed on the upper surface of the steel beam with the fastening bolt member disposed inside a notched recess formed on the peripheral portion, and the underside of the wood flooring has fastening portions on both sides, each fastened to a fastening area on both sides of the notched recess, and a metal band is attached to the lower surface of the wood flooring. An object is fixed to the metal strip, which is positioned facing the notched recess and has a bolt fastening hole formed in the central part at a position corresponding to the connecting bolt member.When the peripheral portion of the wooden flooring is placed on the upper surface of the steel beam, the connecting bolt member is erected through the bolt fastening hole and a nut member is tightened from the tip side of the erected connecting bolt member to the central part of the metal strip, thereby achieving the above-mentioned object by providing a joint structure between a steel beam and a wooden flooring in which the peripheral portion of the placed wooden flooring is integrally joined to the upper surface of the steel beam.

[0012] Furthermore, the joint structure between the steel beam and the wood flooring of the present invention has a countersunk portion formed on the underside of the wood flooring, at least in the fastening areas on both sides of the cut-out recess, and it is preferable that the fastening portions on both sides of the metal strip are each fastened to the underside of the wood flooring in these countersunk portions.

[0013] In addition, in the joint structure between the steel beam and the wooden floor slab of the present invention, it is preferable that the nut member is fastened around the bolt fastening hole in the central part of the metal strip with an eccentric washer interposed.

[0014] Furthermore, in the joint structure between the steel beam and the wooden floor slab of the present invention, it is preferable that the central portion of the metal band arranged facing the cut-out recess is large enough to cover the entire or almost entire area of ​​the cut-out recess from below.

[0015] Furthermore, in the joint structure between the steel beam and the wooden floor slab of the present invention, the fastening portions on both sides of the metal band are fastened to the fastening areas on both sides of the notched recess by driving fastening tools such as wood screws or nails through the fastening holes, and it is preferable that a head seat groove is formed in the opening edge of the fastening hole on the underside of the fastening portion to accommodate the head of the fastening tool.

[0016] In addition, the joint structure between the steel beam and the wood floor slab of the present invention is such that the fastening portions on both sides of the metal band are fastened to the countersunk grooves on both sides of the cut-out recess by driving fastening devices such as wood screws or nails through fastening holes, and it is preferable that the countersunk grooves are formed to a depth that prevents the heads of the driven fastening devices from protruding from the underside of the wood floor slab in the outer part of the countersunk grooves.

[0017] Furthermore, it is preferable that the joint structure between the steel beam and the wood floor slab of the present invention is such that a thickened plate piece is integrally joined to the underside of the central part of the metal band, thereby thickening the central part of the metal band to a thickness similar to the depth of the trench portion.

[0018] Furthermore, in the joint structure between a steel beam and a wooden floor slab of the present invention, it is preferable that the cut recess has a rectangular planar shape.

[0019] In addition, it is preferable that the joint structure between the steel beam and the wood flooring of the present invention is such that the connecting bolt member is erected at the joint point with the wood flooring on the upper surface of the steel beam and fixed in advance before the peripheral portion of the wood flooring is placed on it.

[0020] Furthermore, in the joint structure between the steel beam and the wood floor slab of the present invention, the connecting bolt members are fixed upright from multiple joint points with the wood floor slab on the upper surface of the steel beam, and it is preferable that the notched recesses, to which the band-shaped metal fittings are fixed on the underside, are formed in multiple locations on the peripheral portion of the wood floor slab. [Effects of the Invention]

[0021] According to the joint structure between a steel beam and a wooden floor panel of the present invention, the peripheral portion of the wooden floor panel can be joined integrally to the upper surface of the steel beam more easily and smoothly without filling and hardening resin into each of the stud insertion holes through which the stud bolts are inserted. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view illustrating a joint structure between a steel beam and a wooden floor slab according to a preferred embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of part A in FIG. 1 as viewed from the front side. [Figure 3] FIG. 3 is a perspective view illustrating a wooden floor slab made of cross-laminated timber (CLT). [Figure 4] FIG. 4 is a perspective view illustrating a steel beam made of H-shaped steel. [Figure 5] Figure 5(a) is an oblique view illustrating a metal band, Figure 5(b) is an oblique view illustrating a fastening bolt member, Figure 5(c) is an oblique view illustrating a fastening tool, and Figure 5(d) is an oblique view illustrating an eccentric washer. [Figure 6] FIG. 6 is a perspective view illustrating a state in which a fastening bolt member is installed upright from the top surface of a steel beam made of H-shaped steel and joined. [Figure 7] FIG. 7 is a perspective view illustrating the notched recesses formed on the peripheral edge of the wooden floor slab. [Figure 8] FIG. 8 is a perspective view illustrating the state in which the fastening portion of the metal band is fastened to the seat carving portion carved into the underside of the wooden floor slab. [Figure 9] FIG. 9 is a perspective view illustrating the situation in which the peripheral edge of the wooden floor slab is installed on the top surface of the steel beam. [Figure 10] FIG. 10 is a perspective view seen from the front side illustrating the state in which an eccentric washer is attached to a fastening bolt member inserted into a bolt fastening hole of a metal band. [Figure 11]FIG. 11 is a perspective view seen from above, illustrating a state in which the fastening bolt members are fastened into the bolt fastening holes of the metal band. [Figure 12] FIG. 12 is a perspective view illustrating a situation in which adjacent deck slabs are joined together. [Figure 13] FIG. 13 is an enlarged cross-sectional view illustrating a head seat groove formed at the opening edge of the fastening hole in the fastening portion of the metal band. DETAILED DESCRIPTION OF THE INVENTION

[0023] As shown in Fig. 1, a joint structure 10 between a steel beam and a wood floor slab according to a preferred embodiment of the present invention is employed as a structure for integrally fixing the peripheral portion of the wood floor slab 12 to the upper surface of the steel beam 11 when a wood floor slab 12 made of, for example, cross-laminated timber (CLT) is installed and joined to a steel beam 11 made of, for example, H-shaped steel (including I-shaped steel) in a hybrid building that combines wood and metal materials. The joint structure 10 of this embodiment allows the peripheral portion of the wood floor slab 12 to be joined to the upper surface of the steel beam 11 more simply and smoothly without installing multiple stud bolts on the upper surface of the steel beam 11, forming multiple stud insertion holes in the peripheral portion of the wood floor slab 12, or filling and hardening resin in the stud insertion holes through which the stud bolts are inserted.

[0024] The joint structure 10 between a steel beam and a wooden floor slab in this embodiment is a joint structure for integrally joining the peripheral portion of the wooden floor slab 12 to the upper surface of the steel beam 11 in a building having a structural portion in which a wooden floor slab 12 is installed and supported by the steel beam 11, as shown in Figures 1 and 2.It consists of a connecting bolt member 13 having a male threaded protrusion 13a (see Figure 5(b)) on the outer periphery which is fixed upright from the joint point with the wooden floor slab 12 on the upper surface of the steel beam 11, and a wooden floor slab 12 whose peripheral portion is placed on the upper surface of the steel beam 11 with the connecting bolt member 13 arranged inside a cut-out recess 14 formed in the peripheral portion.As also shown in Figure 8, the fastening portions 15b on both sides are fastened to the fastening areas 12a on both sides sandwiching the cut-out recess 14, and a band-shaped metal fitting 15 is fixed to the underside of the wooden floor slab 12. The central portion 15a of the metal strip 15, which is positioned facing the notched recess 14, has a bolt fastening hole 15c formed at a position corresponding to the connecting bolt member 13 fixed to the upper surface of the steel beam 11.When the peripheral portion of the wooden floor slab 12 is placed on the upper surface of the steel beam 11 (see Figures 1 and 2), the connecting bolt member 13 is erected through the bolt fastening hole 15c, and a nut member 16 is tightened to the central portion 15a of the metal strip 15 from the tip side of the erected connecting bolt member 13, so that the peripheral portion of the placed wooden floor slab 12 is joined as a single unit to the upper surface of the steel beam 11.

[0025] In addition, in this embodiment, as shown in Figure 8, preferably, on the underside of the wooden floor slab 12, countersunk portions 17 are processed and formed in at least the fastening areas 12a on both sides of the notched recess 14, and the fastening portions 15b on both sides of the metal strip 15 are each fastened to the underside of the wooden floor slab 12 at these countersunk portions 17.

[0026] In this embodiment, the wooden floor slabs 12 that make up the joint structure 10 between the steel beams and the wooden floor slabs are, as shown in Figure 3, wooden floor slabs formed into thick planar rectangular shapes with lengths of approximately 1,800 to 12,000 mm, widths of approximately 450 to 3,000 mm, and thicknesses of approximately 36 to 360 mm, using cross-laminated timber (CLT), a known panel material formed by laminating and gluing sawn boards with their grain directions perpendicular to one another. The wooden floor slabs 12 are installed with their peripheral edges supported on the top surfaces of flanges 11a of steel beams 11 made of H-shaped steel (including I-shaped steel) installed in parallel both vertically and horizontally (see Figure 1), so that multiple wooden floor slabs 12 are arranged side by side and connected vertically and horizontally (see Figure 12). At predetermined positions on the periphery of the wooden floor slab 12 where the wooden floor slab 12 is joined to the steel beam 11, corresponding to predetermined positions on the top surface of the steel beam 11 where the joining bolt members 13 are erected, which will be the joints between the wooden floor slab 12 and the steel beam 11, cutout recesses 14 having rectangular planar shapes, for example, measuring approximately 100 to 350 mm in length and width, are formed by cutting out the periphery from the top surface to the entire thickness of the bottom surface (see Figure 7).The cutout recesses 14 can be formed in one or more places on the four sides of each wooden floor slab 12 as needed, or they can be formed in the corners of the wooden floor slab 12.

[0027] As shown in Figure 4, the steel beams 11 supporting the wooden floor slabs 12 are preferably made of H-shaped steel (including I-shaped steel), and are erected vertically with one flange 11a as the upper surface and both ends joined to steel columns or other steel beams, preferably extending vertically and horizontally and parallel to each other. Two fastening bolt members 13 are attached to the H-shaped steel beams 11 in an upright position by joining their lower ends to the upper surface of the steel beams 11 by welding or the like, at predetermined joint locations corresponding to cutout recesses 14 formed on the periphery of the wooden floor slabs 12 to be joined to the steel beams 11 (see Figures 1 and 6).

[0028] 1, 2, 6, etc., the two fastening bolt members 13 are attached in an upright position only on one side of the central rib 11b at the joint of the upper surface of the flange 11a of the steel beam 11, but two fastening bolt members 13 can also be attached in an upright position on the other side. This allows, for example, the peripheral portion of another wood floor slab 12 installed adjacent to the wood floor slab 12 to be connected to the other side using two fastening bolt members 13 at the notched recesses 14, so that the peripheral portion of the other wood floor slab 12 can also be supported by the steel beam 11 and attached in a connected state to the wood floor slab 12 (see FIGS. 11 and 12).

[0029] In this embodiment, the fastening bolt members 13 attached in an upright position to the joints between the upper surfaces of the steel beams 11 and the wooden floor slabs 12 are steel bolt members with a thread diameter of, for example, 10 to 25 mm, and with a male thread ridge 13a formed on the outer circumferential surface, preferably along their entire length, as shown in Figures 5(b) and 6. One end of each fastening bolt member 13 is fixed to the upper surface of the steel beams 11 by welding or the like, so that it is installed vertically at a height of, for example, 50 to 120 mm, which is lower than the thickness of the wooden floor slabs 12, and is firmly attached as a single unit to the joints between the upper surfaces of the steel beams 11 and the wooden floor slabs 12, preferably before the wooden floor slabs 12 are placed on the upper surface of the steel beams 11.

[0030] In this embodiment, the metal band 15, whose central portion 15a faces the recessed cutout 14 on the underside of the wooden floor slab 12, can be formed, as shown in Figures 5(a) and 8, preferably from a metal plate, such as a steel plate member with a thickness of approximately 2.3 to 12 mm. The metal band 15 preferably has a strip shape with a width of approximately 30 to 150 mm, shorter than the length of both side edges of the rectangular planar shape of the recessed cutout 14. The central portion 15a, which faces the recessed cutout 14 and is sandwiched between the fastening portions 15b on both sides, has a rectangular protruding piece 15d that protrudes to one side by a protruding width of approximately 50 to 400 mm, making it wider on one side than the fastening portions 15b. This results in the metal band 15 having a generally flat, convex planar shape. In the central portion 15a, which has a wider width, a pair of bolt fastening holes 15c are formed in a width region similar to the width of the fastening portions 15b on both sides, as circular opening holes with a diameter slightly larger than the outer diameter of the fastening bolt members 13, for example, approximately 30 to 50 mm, corresponding to each of the two fastening bolt members 13 fixed to the upper surface of the steel beam 11.

[0031] Furthermore, in this embodiment, the fastening portions 15b on both sides of the central portion 15a of the metal strip 15 are formed with a plurality of fastening holes 15e that allow a plurality of fasteners 18 such as wood screws or nails (see FIG. 5(c)) to be driven toward the fastening areas 12a on both sides of the notched recess 14 on the underside of the wooden floor slab 12, thereby fastening and fixing the metal strip 15 to the underside of the wooden floor slab 12. As shown in FIG. 5(c), the fasteners 18 such as wood screws or nails have enlarged heads 18a at the rear end in the driving direction. For this reason, on the underside of the fastening portion 15b of the metal band 15, which is the surface opposite to the surface that comes into close contact with the fastening areas 12a on both sides of the notched recess 14 of the wooden floor slab 12, head seat recesses 15f that accommodate the heads 18a of the fasteners 18 are formed at the opening edges of the fastening holes 15e, as shown in Figure 13. This makes it possible to store the heads 18a of the fasteners 18, which are driven through the multiple fastening holes 15e toward the fastening areas 12a on both sides of the notched recess 14 on the underside of the wooden floor slab 12, in the head seat recesses 15f without protruding, and to maintain the underside of the metal band 15 in a flat state.

[0032] Furthermore, in this embodiment, as described above, countersunk grooves 17 are preferably formed on the underside of the wooden floor slab 12, preferably in the fastening area 12a on both sides of the notched recess 14, as shown in FIG. 8 . The fastening portions 15b on both sides of the metal strip 15 are fastened to the underside of the wooden floor slab 12 at these countersunk grooves 17. The countersunk grooves 17 are preferably formed by countersunk grooves, for example, 5 to 25 mm deep, from the underside of the wood floor slab 12 to have a rectangular planar shape. For example, if the head countersunk grooves 15f for accommodating the heads 18a of the fasteners 18 are not formed at the opening edge of the fastening holes 15e on the underside of the fastening portions 15b of the metal strip 15, the countersunk grooves 17 are preferably formed deep enough so that the heads 18a of the driven fasteners 18 do not protrude from the underside of the wooden floor slab 12 outside the countersunk grooves 17. This allows the underside of the peripheral portion of the wooden floor slab 12 to be kept flat, making it possible to easily place the peripheral portion in close contact with the upper surface of the steel beam 11.

[0033] To integrally join the peripheral portion of the wood flooring 12 to the upper surface of the steel beam 11 using the joint structure 10 between a steel beam and a wood flooring of this embodiment having the above-mentioned configuration, for example, a predetermined position corresponding to the notched recess 14 on the peripheral portion of the wood flooring 12 where the wood flooring 12 will be joined in the steel beam 11 is used as the joint point, and preferably two fastening bolt members 13 are previously joined and erected by welding or the like to the upper surface of the steel beam 11 (see FIG. 6). Furthermore, the wood flooring 12 to which the metal strip 15 is fastened using fasteners 18 to the underside of the portion where the notched recess 14 is formed is lifted, and the peripheral portion of the wood flooring 12 is placed on the upper surface of the steel beam 11 while the erected fastening bolt members 13 are inserted into the bolt fastening holes 15c in the central portion 15a of the metal strip 15 positioned facing the notched recess 14, as shown in FIG.

[0034] Next, as shown in FIG. 10, an eccentric washer 19 is attached to the fastening bolt member 13, which is inserted through the bolt fastening hole 15c in the central portion 15a of the metal strip 15 and stands upright in the inner area of ​​the notched recess 14 formed in the peripheral portion of the wooden floor slab 12 placed on the steel beam 11. As shown in FIG. 5(a), the eccentric washer 19 is a washer with an elongated hole 19a formed as a fastening hole. With the eccentric washer 19 in place, a nut member 16 is threaded onto the fastening bolt member 13 and tightened around the bolt fastening hole 15c in the central portion 15a of the metal strip 15. This absorbs any misalignment that may occur when aligning the fastening bolt member 13 on the steel beam 11 with the bolt fastening hole 15c on the wooden floor slab 12, thereby avoiding additional work such as re-drilling the bolt fastening hole 15c. Furthermore, preferably with an eccentric washer 19 interposed, a nut member 16 is screwed onto the connecting bolt member 13 and tightened around the bolt fastening hole 15c in the central portion 15a of the metal strip 15, thereby firmly and stably fixing the peripheral portion of the wooden floor slab 12 placed on the upper surface of the steel beam 11 to the upper surface of the steel beam 11, as shown in Figure 2, and the wooden floor slab 12 is supported on the upper surface of the steel beam 11, making it possible to easily join them as a single unit.

[0035] As a result, according to the joint structure 10 between the steel beam and the wooden floor slab of this embodiment, it is possible to more easily and smoothly join the peripheral portion of the wooden floor slab 12 as a single unit to the upper surface of the steel beam 11 without filling and hardening resin into each of the stud insertion holes through which the stud bolts are inserted.

[0036] In addition, in this embodiment, as shown in Figure 11, at the joint of the upper surface of the flange 11a of the steel beam 11, the other side area sandwiching the central rib 11b can also be supported by the steel beam 11 and joined as a whole by using a joint structure 10 and construction method similar to those described above, for example, on the other side area of ​​the steel beam 11, sandwiching the rib 11b in the central area, to support the peripheral portion of another wooden floor slab 12 that is installed adjacent to the wooden floor slab 12 whose peripheral portion is placed on one side area.

[0037] Furthermore, in this embodiment, another wood floor slab 12 is attached to the other side of the central rib 11b at the joint where the flange 11a of the steel beam 11 joins the upper surface. By supporting the peripheral portion of the other wood floor slab 12 on the steel beam 11, the cutout recesses 14 are connected to each other, forming a rectangular opening as shown in FIG. 11 around the peripheral portion of the pair of adjacent wood floor slabs 12. The openings formed by the cutout recesses 14 of the pair of adjacent wood floor slabs 12 can be filled by fastening nuts 16 around the bolt fastening holes 15c, and then filling and solidifying a filling material such as mortar. In this embodiment, the metal strip 15 arranged on the underside of the wood floor slab 12 facing the cutout recess 14 has a central portion 15a that is wider on one side, as described above. The wider central portion 15a is large enough to cover the entire or substantially entire cutout recess 14 from below. This makes it possible to use the central portion 15a of the metal strip 15 as a formwork to cover the opening bottom surface of the notched recess 14, making it easier to fill with a filling and solidifying material such as mortar.

[0038] Furthermore, in this embodiment, for example, when the countersunk grooves 17 formed in the fastening areas 12a on at least both sides of the notched recess 14 on the underside of the wooden floor slab 12 are formed deeper than the thickness of the metal strip 15, thickened plate pieces 15g (see FIG. 8) are preferably integrally joined to the underside of the central portion 15a of the metal strip 15, thereby thickening the central portion 15a of the metal strip 15 to a thickness similar to the depth of the countersunk grooves 17. This makes it possible to effectively prevent the central portion 15a from bending downward when the nut member 16 is fastened around the bolt fastening hole 15c in the central portion 15a of the metal strip 15. Instead of joining the thickened plate piece 15g as a single piece in advance in this manner, by appropriately positioning a spacer or the like that supports the central portion 15a of the metal strip 15 from below when tightening the nut member 16, it is possible to prevent the central portion 15a from bending downward when tightening the nut member 16 around the bolt tightening hole 15c of the metal strip 15.

[0039] In addition, in this embodiment, multiple wooden floor slabs 12 are installed in a lined-up state, with their peripheral portions supported on the upper surface of a steel beam 11 made of H-shaped steel (including I-shaped steel) and connected vertically and horizontally using a joint structure 10 between the steel beam and the wooden floor slab.The multiple wooden floor slabs 12 can also be integrated at their upper surfaces by joining the peripheral portions of each pair of adjacent wooden floor slabs 12 to each other using a strip-shaped joint plate 20, as shown in Figure 12, for example.

[0040] The joint structure 10 between a steel beam and a wooden floor slab according to this embodiment also provides the following advantages. Specifically, because it is a dry joint structure that does not use resin, construction can be performed more quickly. Because drilling holes in the steel beam 11, which is the structural frame, is not required, the design can be performed without reducing the bearing strength of the steel beam 11. Because the metal bands 15 can be fastened to the wooden floor slab 12 in advance in a factory or the like, the amount of work required at the construction site can be reduced. Because no metal parts requiring complex processing are used, the fabrication of the components is simplified. All construction work at the site can be performed from above the beam or floor. Because the connecting bolt members 13 can be welded to the steel beam 11 before the wooden floor slab 12 is installed, measures can be easily taken to prevent welding defects.

[0041] The present invention is not limited to the above-described embodiments and various modifications are possible. For example, a countersunk groove does not necessarily need to be formed on the underside of the wooden flooring; the fastening portions on both sides of the metal strip can be fastened to a fastening area without a countersunk groove. The nut member can also be fastened around the bolt fastening hole with a washer other than an eccentric washer interposed. The central portion of the metal strip facing the notched recess does not need to be large enough to cover the entire or almost entire notched recess from below. The notched recess does not necessarily have a rectangular planar shape; it can have a semi-elliptical shape with curved corners or a semicircular planar shape. The connecting bolt member can be fixed upright from the upper surface of the steel beam at multiple joints with the wooden flooring. The peripheral portion of the wooden flooring can have multiple notched recesses formed at its underside to secure the metal strip.

[0042] Furthermore, the fastening bolt members do not necessarily need to be erected from the joints between the steel beam and the wood flooring and secured in advance before the peripheral portions of the wood flooring are placed on them. For example, after the peripheral portions of the wood flooring are placed on the top surface of the steel beam, the fastening bolt members can be erected from the joints by stud welding using a known welding gun to the top surface of the steel beam through bolt fastening holes formed in the center of the metal bands.

[0043] 10 Joint structure between steel beams and wooden floor slabs 11 Steel beam (H-shaped steel) 11a flange 11b Rib 12 Wood floor slab 12a Fastened area 13. Connecting bolt components 13a Male thread ridge 14 Cutout recess 15 Metal strips 15a central part 15b Fastening part 15c Bolt fastening hole 15d Rectangular protruding piece 15e fastening hole 15f Wood screw head seat boring 15g thickened plate piece 16 Nut material 17. Zahoribe 18 Fasteners 18a head 19 Eccentric washer 19a long hole 20 Belt-shaped joint plate

Claims

1. In a building having a structural part in which a wooden floor slab is installed and supported by a steel beam, a joint structure for integrally joining the peripheral part of the wooden floor slab to the upper surface of the steel beam, The wooden floor slab is made up of a fastening bolt member having a male threaded protrusion on the outer periphery, which is fixed upright from the joint between the upper surface of the steel beam and the wooden floor slab, and the wooden floor slab is placed on the upper surface of the steel beam with the fastening bolt member disposed inside a notched recess formed on the peripheral edge. On the underside of the wooden floor slab, the fastening portions on both sides are fastened to the fastening areas on both sides of the notched recess, and a metal band is fixed, A bolt fastening hole is formed in the central portion of the metal strip, which is arranged facing the notched recess, at a position corresponding to the fastening bolt member, and when the peripheral portion of the wooden floor slab is placed on the upper surface of the steel beam, the fastening bolt member is erected through the bolt fastening hole, A nut member is fastened to the central portion of the metal strip from the tip side of the erected connecting bolt member, thereby forming a joint structure between a steel beam and a wooden flooring in which the peripheral portion of the placed wooden flooring is integrally joined to the upper surface of the steel beam.

2. A joint structure between a steel beam and a wood flooring as described in claim 1, wherein a countersunk portion is formed on the underside of the wood flooring at least in the fastening areas on both sides of the cut-out recess, and the fastening portions on both sides of the metal strip are each fastened to the underside of the wood flooring in these countersunk portions.

3. 3. A joint structure between a steel beam and a wooden floor slab as described in claim 1 or 2, wherein the nut member is fastened around the bolt fastening hole in the central portion of the metal strip with an eccentric washer interposed.

4. A joint structure between a steel beam and a wooden floor slab as described in claim 1 or 2, wherein the central portion of the metal strip arranged facing the cut recess is large enough to cover the entire or almost entire area of ​​the cut recess from below.

5. The fastening portions on both sides of the metal band are fastened to the fastening areas on both sides of the notched recess by driving fastening tools such as wood screws or nails through the fastening holes, and a head seat groove is formed in the opening edge of the fastening hole on the underside of the fastening portion to accommodate the head of the fastening tool.A joint structure between a steel beam and a wooden floor slab as described in claim 1 or 2.

6. The fastening portions on both sides of the metal band are fastened to the trench portions on both sides of the notched recess by driving fastening devices such as wood screws or nails through fastening holes, and the trench portions are formed to a depth that prevents the heads of the driven fastening devices from protruding from the underside of the wood flooring at the outer part of the trench portion.

7. A joint structure between a steel beam and a wooden floor slab as described in claim 6, wherein a thickened plate piece is integrally joined to the underside of the central part of the metal band, thereby thickening the central part of the metal band to a thickness equal to the depth of the trench portion.

8. 3. The joint structure between a steel beam and a wooden floor slab according to claim 1, wherein the recessed cutout has a rectangular planar shape.

9. A joint structure between a steel beam and a wooden floor slab as described in claim 1 or 2, wherein the connecting bolt member is erected and fixed in advance at the joint point between the steel beam and the wooden floor slab on the upper surface of the steel beam before the peripheral portion of the wooden floor slab is placed on it.

10. The connecting bolt members are fixed upright from the joint points between the upper surface of the steel beam and the multiple wooden floor slabs, and the notched recesses to which the strip-shaped metal fittings are fixed on the underside are formed in multiple locations on the peripheral portion of the wooden floor slab.This is a joint structure between a steel beam and a wooden floor slab as described in claim 1 or 2.

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