Floor structure

Abstract

When at least a part of a floor beam constituting a floor structure surface 1 is a steel beam 15, at least one floor panel support beam 61 made of wood (floor panel support member) is attached to the side of the steel beam 15, and the top end of the steel beam 15 and the top end of the floor panel support beam 61 are flush with each other. Floor panels 2 (21, 22) made of wood are laid on the steel beam 15 and the floor panel support beam 61, and fastened to the floor panel support beam 61 with nails 81 or screws. By adopting such a floor structure, dimensional fitting in the height direction including the floor panel 2 is streamlined, sufficient floor surface rigidity is ensured, and workability is also improved.

Description

floor structure

[0001] The invention disclosed in this application relates to a floor structure in which, when at least some of the floor beams that make up the floor structural surface of a framework are steel beams, wooden floor panels are laid and fixed on top of the steel beams.

[0002] In buildings with a wooden frame structure made up of wooden pillars, beams, etc., a so-called "rigid floor construction method" is often used, in which wooden floor panels made of thick structural plywood or the like are laid on top of the floor surface surrounded by a rectangle by intersecting floor beams, and the floor panels are directly fastened to the top ends of the floor beams with nails or screws to strengthen the rigidity of the floor surface.

[0003] Furthermore, in buildings with wooden frameworks made up of columns, beams, etc. made of wooden materials, some of the floor beams are sometimes replaced with steel beams made of H-shaped steel, etc., in order to realize large-span spaces and large window openings. In such mixed wood-and-steel frameworks, if the heights of the top ends of the wooden floor beams (hereinafter referred to as "wooden beams") and the steel beams are aligned, and wooden floor panels are laid on the floor structural surface surrounded by these floor beams and fastened to each floor beam, an inconvenience arises in that nails or screws cannot be directly driven into the top ends of the steel beams.

[0004] A floor structure disclosed in Patent Document 1, for example, is a known technique for joining wooden floor panels to steel beams. In this floor structure, angle-shaped steel support members are bolted to the sides of the webs of H-shaped steel beams, with the horizontal sections of the support members extending outward from the steel beams. A floor panel made of cross-laminated timber (CLT) is then placed on top of the support members, and the horizontal sections of the support members are fastened to the underside of the floor panel with screws. However, constructing this floor structure requires scaffolding to screw the support members to the floor panel from below. This requires workers to perform extensive upward screwing work, leaving room for improvement in terms of workability. Furthermore, because the floor panels are dropped to the sides of the steel beams, this floor structure also requires a subfloor surface, such as plywood, to be layered on top of the floor panel and steel beams.

[0005] Another known technology for supporting wooden floor panels with steel beams is a building structure that utilizes composite beams (composite beams) made of wood and steel, as disclosed in Patent Document 2. The composite beam is formed by layering laminated timber (referred to as "external beam panels" in the document) of the same width as the upper flange and the lower flange of an H-shaped steel beam on the upper surface and the lower surface of the lower flange. The plywood that forms the subfloor surface is then laid on top of the laminated timber layer on the upper flange. In this configuration, the plywood can be screwed from above to the laminated timber of the composite beam. However, because the effective beam depth (height) of the composite beam is large, maintaining a constant floor height restricts the ceiling height and window opening height of lower floors.

[0006] JP 2019-190102 A JP 2002-115331 A

[0007] The invention disclosed in this application was made in consideration of the circumstances described above, and aims to solve the problem of a floor structure for laying and fixing floor panels made of structural plywood or other wood materials on top of steel beams when at least some of the floor beams that make up the floor structure are made of steel beams, while ensuring sufficient floor rigidity and improving workability, while streamlining the dimensional fit in the height direction including the floor panels.

[0008] The basic configuration of the floor structure adopted by the invention disclosed in this application to achieve the above-mentioned object is characterized as follows: at least one floor panel support member made of wood is attached to the side of a steel beam that constitutes at least one side of the floor structural surface, the top end of the steel beam and the top end of the floor panel support member are aligned flush, at least one floor panel made of wood is laid on top of the steel beam and the floor panel support member, and the floor panel is fastened to the floor panel support member with nails or screws.

[0009] In this floor structure, the floor panel support member is a rectangular cross-section floor panel support beam that has a predetermined material length and is arranged parallel to the steel beam, and at least a pair of beam support hardware is attached to the side of the web of the steel beam with a gap corresponding to the material length of the floor panel support beam, and the floor panel support beam can be attached to the side of the steel beam by joining both ends of the floor panel support beam to the pair of beam support hardware, respectively.

[0010] In this case, the beam support hardware has a long rectangular attachment base that is connected to the steel beam side via an appropriate connecting means and is held in a position perpendicular to the material axis of the steel beam, and a pair of beam insertion pieces that are bent at a right angle in a plan view from both side edges of the attachment base and extend parallel to the material axis of the steel beam, and a receiving groove is formed in the upper edge of the beam insertion piece and multiple through holes are formed in the middle part of the beam insertion piece, so that the beam insertion piece is inserted into a slit formed in the end of the floor panel support beam and a pin member that crosses the slit and penetrates the floor panel support beam in the beam width direction engages with the receiving groove or the through hole of the beam insertion piece, thereby joining the floor panel support beam to the beam support hardware.

[0011] Furthermore, the connecting means for connecting the beam support hardware to the steel beam may be composed of at least one stiffener joined to the side of the steel beam in a direction perpendicular to the material axis of the steel beam, and at least one beam support hardware support connected to the stiffener and protruding laterally from the steel beam.

[0012] The beam support hardware may have its attachment base fastened to the beam support hardware support with bolts and nuts. Furthermore, at least a pair of the beam support hardware may be connected back to back with the beam support hardware support sandwiched between the attachment bases.

[0013] Furthermore, in the floor structure relating to the basic configuration described above, the floor panel support member is a floor panel support block in which a plate piece of the same thickness as the upper flange of the steel beam is overlaid on part of the upper surface of the rectangular parallelepiped, or in which a recess of the same thickness as the upper flange of the steel beam is formed, and the attachment means for attaching the floor panel support block to the steel beam can also be configured to include at least one pair of stiffeners that are joined to the side of the steel beam in a direction perpendicular to the material axis of the steel beam and face each other at an interval corresponding to the length of the floor surface material support block, and a plurality of pin members that penetrate the floor panel support block in the longitudinal direction and engage with a plurality of mounting holes formed in the stiffener pair.

[0014] Furthermore, the invention disclosed in this application allows the floor panels in the floor structure according to the above-mentioned basic configuration to be installed in one of the following three ways.

[0015] (1) The portion laid on the steel beam and the portion laid on the floor panel support are arranged so as to be separated along the boundary between the steel beam and the floor panel support, and the floor panel in the portion laid on the steel beam is fastened to the top of the steel beam via adhesive, double-sided tape or clips.

[0016] (2) The edge of the portion laid on the floor panel support is positioned so as to extend over the steel beam across the boundary between the steel beam and the floor panel support, and is fastened to the floor panel support with nails or screws.

[0017] (3) The edge of the part laid on the steel beam is positioned so as to extend over the floor panel support material across the boundary between the steel beam and the floor panel support material, and is fastened to the floor panel support material with nails or screws.

[0018] In the floor structure constructed as described above, the tops of the wooden and steel beams that make up the floor structure are aligned flush, and wooden floor panels are laid on top of them. The height dimension is adjusted in a simple and rational way, without increasing the depth of the floor beams or adding extra materials above or below them, ensuring the levelness of the subfloor surface, and therefore preventing the ceiling height and window opening height of the lower floors from being unnecessarily restricted.

[0019] The floor panels can be fastened from above with nails or screws to floor panel support members made of wood attached to the sides of the steel beams. All of the members used to attach the floor panel support members to the sides of the steel beams, except for the stiffeners welded to the webs of the steel beams, can be bolt-and-nut or pin-jointed, greatly improving workability at the construction site.

[0020] Vertical and horizontal loads acting on the floor structure are transmitted from the floor panels to the steel beams via the floor panel support beams, thereby achieving desirable floor rigidity.

[0021] 1 is a plan view showing an example of a mixed wood-steel floor structural surface to which the invention disclosed herein is applied. FIG. 1 is a partial plan view of a column-beam joint (part A) in the floor structural surface of FIG. 1. FIG. 2 is a partial side view of the column-beam joint (part A) in the same case. FIG. 3 is an exploded perspective view of the column-beam joint (part A) in the same case. FIG. 4 is a partial plan view of a joint (part B) between a steel beam and a floor panel support beam in the floor structural surface of FIG. 1. FIG. 5 is a partial side view of the joint (part B) between a steel beam and a floor panel support beam in the same case. FIG. 6 is an exploded perspective view of the joint (part B) between a steel beam and a floor panel support beam in the same case. FIG. 7 is a partial side view showing a joint form between a steel beam and a floor panel support block as another embodiment applied to part B. FIG. 8 is an exploded perspective view showing a joint form between a steel beam and a floor panel support block in the same case. FIG. 9 is a partial side view showing another example of a form of installation of floor panels on steel beams and floor panel support members. FIG. 11 is a partial side view showing yet another example of a form of installation of floor panels on steel beams and floor panel support members.

[0022] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a mixed wood-steel floor structure to which the present invention is applied. This floor structure 1 is constructed by framing wooden beams with elongated rectangular cross sections made of solid wood, laminated timber, or other wood materials so that their top edges are flush with one another. The illustrated floor structure 1 has a size of two spans in each of the X and Y directions, with one span (the reference distance between the columns) being approximately 4.5 meters. Wooden beams 13, each having a length equivalent to one span, are installed on the periphery between four corner columns 11 and a middle column 12, both made of wood. In the left-hand region of the figure, multiple beams 14, each consisting of two wooden beams joined in the beam width direction, are installed in the Y direction, with their length extending two spans. In the center of the figure, a single steel beam 15, made of H-shaped steel and having a length equivalent to two spans, is installed in the Y direction. Between the middle of the steel beams 15 and the outer periphery columns 12, wooden beams 16 each having a length equivalent to one span are installed in the X direction, and a plurality of wooden beams 17 are installed in the Y direction between the wooden beams 16 and the outer periphery columns 13. These create a space with no columns in the center, which is equivalent to two spans vertically and horizontally.

[0023] Then, floor panels 2 made of structural plywood or other wood materials are laid on this floor structural surface 1. The floor panels 2 are formed so that the length of at least one side is equal to or greater than the distance between adjacent wooden beams 13, 17 or joint beams 14, and are bridged between adjacent wooden beams 13, 17 or joint beams 14, with the vicinity of the edges of at least two opposing sides fastened to the wooden beams 13, 16, 17 or joint beams 14 with multiple nails or screws.

[0024] Figures 2 to 4 show the joint structure of the column-beam joint (circled area A) at the outer periphery of the floor structural surface 1 in Figure 1. In this area, two wooden beams 13, 13 are joined together in the X direction, sandwiching a single column 12 made of wooden material with a square cross section between them, and a single steel beam 15 is joined in the Y direction, which is perpendicular to the wooden beams 13, 13.

[0025] The column 12 and wooden beam are joined to each other using a beam support hardware 3 as shown in Figure 4. The illustrated beam support hardware 3 is a hardware made by bending a steel plate into a roughly U-shape in plan view, which is conventionally used in wooden frame buildings. The beam support hardware 3 has a rectangular attachment base 31 that is attached to the side of the column 12, and a pair of parallel beam insertion pieces 32, 32 that bend at a right angle in plan view from both side edges of the attachment base 31 and extend away from the column 12. The attachment base 31 has multiple mounting holes (not shown) formed in a vertical row at predetermined intervals. The beam support hardware 3 is attached to the side of the column 12 by inserting bolts 41 through the mounting holes, passing them through the column 12, and fastening them with nuts. In the illustrated part A, two beam support hardware 3, 3 are attached to two opposing sides of the column 12 so that they are back to back with the column 12 in between, and are fastened together by bolts and nuts that pass through the column 12.

[0026] Each beam insertion piece 32 of the beam support hardware 3 also has multiple through holes 33 formed in a vertical row at a predetermined interval, and a receiving groove 34 formed in the upper edge. Meanwhile, the wooden beam 13 has two parallel slits 131, 131 opening into its end face, and multiple pin member insertion holes 132 intersecting the slits 131, 131 and penetrating the wooden beam 13 in the beam width direction, formed in a vertical row at a predetermined interval. The spacing between the slits 131, 131 matches the spacing between the beam insertion pieces 32, 32 of the beam support hardware 3, and the end face of the portion sandwiched between the slits 131, 131 is cut so as not to interfere with the head of the bolt 41 that attaches the beam support hardware 3 to the column 12. Then, the two beam insertion pieces 32, 32 of the beam support hardware 3 are inserted into the two slits 131, 131 of the wooden beam 13, and the pin members (bolts 42 or drift pins) inserted into the pin member insertion holes 132 of the wooden beam 13 are engaged with the through holes 33 or receiving grooves 34 of the beam insertion pieces 32, 32, thereby joining the wooden beam 13 to the beam support hardware 3. In the illustrated floor structural surface 1, this beam support hardware 3 is also used at column-beam joints other than part A and at orthogonal joints between wooden beams.

[0027] A steel beam 15 is joined to the side of the joint between the column 12 and two wooden beams 13, 13 formed in this way via a steel beam connector 5 and a pair of splice plates 54. The steel beam connector 5 is a steel member that is T-shaped in plan view and includes a rectangular mounting base plate 51 and a web joint piece 52 that protrudes perpendicularly from the center of the mounting base plate 51. Mounting holes 53 are formed near both side edges of the mounting base plate 51, aligned vertically at predetermined intervals to match the positions of the pin members (bolts 42) that join the beam support hardware 3 and the wooden beam 13. The bolts 42 that join the beam support hardware 3 and the wooden beam 13 are inserted into these mounting holes 53 to attach the steel beam connector 5 to the side of the joint between the column 12 and the two wooden beams 13, 13.

[0028] The web joint piece 52 of the steel beam connector 5 and the web 151 of the steel beam 15 each have multiple connection holes 521, 156 aligned vertically at a predetermined interval. The end faces of the web joint piece 52 and the web 151 are butted together, and their sides are sandwiched between a pair of splice plates 54, 54, each with a connection hole 541 formed at the same position, and then bolted and nutted. In this way, a column-beam joint that is T-shaped in plan view is formed, with the steel beam 15 joined to the side of the joint between the column 12 and two wooden beams 13. Note that in the illustrated portion A, an auxiliary support 18 made of a square steel pipe or the like is erected below the end of the steel beam 15 to support the bottom flange 152 of the steel beam 15. This allows the required strength (e.g., steel plate size, plate thickness, number of bolts and nuts) of the steel beam connector 5 and the splice plate 54 to be reduced.

[0029] Figures 5 to 7 show the structure of the middle part (circled part B) of the steel beam 15 in the floor structural surface 1 in Figure 1. In this part, the floor panel 2 cannot be directly fastened to the steel beam 15 with nails or screws, so floor panel support members made of wood are attached to the sides of the steel beam 15, and the floor panel 2 is fastened to the floor panel support members. This floor structure is the main part of the invention disclosed in this application.

[0030] The floor panel support member in the illustrated embodiment is a floor panel support beam 61 with a vertically long rectangular cross section made of solid wood, laminated wood, or other wood material. The beam width of the floor panel support beam 61 is equal to that of the wooden beam 13 described above, but the beam depth is smaller than that of the wooden beam 13, and the material length is set to about half the span.

[0031] This floor panel support beam 61 is attached to a stiffener (rib plate) 154 welded to the side of the steel beam 15 by combining the same beam support hardware 3 as described above with a separately prepared beam support hardware support 7. The stiffener 154 is welded to the web 151, lower flange 152, and upper flange 153 of the steel beam 15 in a direction perpendicular to the material axis of the steel beam 15. The stiffener 154 has a plurality of mounting holes 155 formed in it that are aligned vertically at predetermined intervals.

[0032] The beam support hardware support 7 shown in the center of Figures 5, 6, and 7 comprises a support piece 71 joined to a stiffener 154 and extending out to the side of the steel beam 15, an expansion piece 72 joined to the edge of the support piece 71 so as to be perpendicular to the support piece 71, and a pair of parallel beam support pieces 73, 73 extending out to the side of the steel beam 15 from both side edges of the expansion piece 72. The support piece 71 has a plurality of bolt insertion holes 74 formed therein that match the mounting holes 155 formed in the stiffener 154. The support piece 71 is placed on the stiffener 154, and bolts 43 are inserted into the bolt insertion holes 74 and the mounting holes 155 and fastened with nuts, thereby joining the support piece 71 to the stiffener 154.

[0033] The beam support piece 73 also has a plurality of bolt insertion holes formed therein that match the mounting holes 311 formed in the attachment base 31 of the beam support hardware 3. The attachment base 31 of the beam support hardware 3 is placed on the beam support support piece 73, and bolts 44 are inserted into the bolt insertion holes and mounting holes 311 and fastened with nuts. As a result, the two beam support hardware 3, 3 are placed back-to-back with the beam support hardware support 7 sandwiched between the attachment bases 31, and the respective beam insertion pieces 32, 32 are connected so that they are facing each other back to back and parallel to the material axis of the steel beam 15.

[0034] On the other hand, the floor panel support beam 61 has two parallel slits 611, 611 opening into its end face, and multiple pin member insertion holes 612 that intersect with the slits 611, 611 and pass through the floor panel support beam 61 in the beam width direction, lined up vertically at a predetermined interval. The spacing between the slits 611, 611 matches the opposing spacing between the beam insertion pieces 32, 32 of the beam support hardware 3, and the end face of the portion sandwiched between the slits 611, 611 is cut so as not to interfere with the head of the bolt 44 that attaches the beam support hardware 3 to the beam support hardware support 7. Then, the beam insertion pieces 32, 32 of the beam support hardware 3 are inserted into the slits 611, 611 of the floor panel support beam 61, and the pin member (bolt 45 or drift pin 46) inserted into the pin member insertion hole 612 of the floor panel support beam 61 is engaged with the through hole 33 or receiving groove 34 of the beam insertion pieces 32, 32, thereby joining the floor panel support beam 61 to the beam support hardware 3 and the beam support hardware support 7 and holding it parallel to the steel beam 15.

[0035] As shown in the lower right of Figure 7, the beam support hardware support 7 can also be configured as a single plate formed by integrating a support piece 71 joined to the stiffener 154 with a beam support piece 73, with a pair of beam support hardware 3 attached back to back to both sides of the plate.

[0036] In the invention disclosed herein, the dimensions of each part of the beam support hardware support 7 and the positions of the bolt insertion holes 74, etc., are set so that the top end of the floor panel support beam 61 attached to the steel beam 15 is flush with the top end of the steel beam 15. Then, floor panels 2 made of structural plywood or other wood materials are laid on top of the floor panel support beam 61 and fastened to the floor panel support beam 61 with multiple nails 81 or screws. This fastening work can be performed from above the floor panel 2. This floor structure ensures the levelness of the subfloor surface with a simple and rational fit, without increasing the beam depth of the floor beams or adding extra components above or below the floor beams. Therefore, the ceiling height and window opening height of the lower floors are not unnecessarily restricted.

[0037] In the embodiment shown in Figure 6, the floor panel 2 (21) laid on the floor panel support beam 61 and the floor panel 2 (22) laid on the steel beam 15 are laid so as to be separated along the boundary between the steel beam 15 and the floor panel support beam 61. A floor panel 22 with a plate width roughly matching the flange width of the steel beam 15 is laid on top of the steel beam 15, but since this floor panel 22 has a smaller area than the floor panel 21 laid over the entire floor structural surface 1, it can be fastened to the top end of the steel beam 15 using adhesive or double-sided tape. Alternatively, as shown in Figure 6, they can be fastened using a clip 82 that is roughly C-shaped in side view and clamps the edges of the steel beam 15 and floor panel 22 together.

[0038] 8 and 9 show another embodiment of a floor panel support member and its mounting structure. The illustrated floor panel support member is a floor panel support block 62 formed into a short rectangular parallelepiped shape from solid wood, laminated wood, or other wood material. A step 621 corresponding to the thickness of the upper flange 153 of the steel beam 15 is formed on the top surface of the floor panel support block 62 by overlapping board pieces or by forming a recess.

[0039] This floor panel support block 62 is attached to two stiffeners (stiffener pair) 154, 154 that are joined to the sides of the steel beam 15 in a direction perpendicular to the material axis of the steel beam 15. The two stiffeners 154, 154 are attached with a gap corresponding to the length of the floor panel support block 62 (the dimension in the direction parallel to the material axis of the steel beam 15), and multiple mounting holes 155 are formed in the same positions in the middle part.

[0040] Meanwhile, the floor panel support block 62 also has pin member insertion holes 622 formed in multiple locations that match the mounting holes 155 formed in the stiffeners 154, and by overlapping these and inserting pin members (bolts or drift pins 47) through them, the floor panel support block 62 is attached to the side of the steel beam 15 with approximately half of it submerged below the upper flange 153 of the steel beam 15. Also in this form, the positions of the mounting holes 155 and the like are set so that the top end of the steel beam 15 and the top end of the floor panel support block 62 are aligned flush, and the floor panel 2 laid on the floor panel support block 62 is fastened to the floor panel block 62 with multiple nails 81 or screws.

[0041] According to the floor structure described above, even when steel beams 15 are placed on part of the floor structural surface 1, it is possible to fasten the floor panels 2 to the floor structural surface 1 using only nails 81 or screws. All means for attaching the floor panel support beams 61 and floor panel support blocks 62 to the sides of the steel beams 15 can be bolt and nut joints or pin joints, except for the stiffeners 154 welded to the webs 151 of the steel beams 15, greatly improving workability at the construction site. Vertical and horizontal loads acting on the floor structural surface 1 are transmitted from the floor panels 2 to the steel beams 15 via the floor panel support members, thereby achieving desirable floor rigidity.

[0042] 10 and 11 show other configurations for laying and fastening the floor panel 2. In the configuration shown in Fig. 10, the edge of the floor panel 21 laid on the floor panel support member (floor panel support beam 61) is arranged so that it straddles the boundary between the steel beam 15 and the floor panel support beam 61 and extends to the vicinity of the axial center of the steel beam 15. The floor panel 21 is fastened to the floor panel support beam 61 with a plurality of nails 81 or screws. In other words, in this configuration, only the vicinity of the edge of the floor panel 21 rests on the steel beam 15.

[0043] 11, the floor panel 22 laid on the steel beam 15 is formed to be larger than the width of the steel beam 15, and is positioned so that its edge spans the boundary between the steel beam 15 and the floor panel support beam 61 and extends over the floor panel support beam 61, and the floor panel 22 is fastened to the floor panel support beam 61 with a plurality of nails 81 or screws. Therefore, even in this form, the floor panel 22 simply rests on the steel beam 15.

[0044] In this way, even with a floor structure in which the floor panels 22 laid on top of the steel beams 15 are not fastened directly to the steel beams 15 but to floor panel support members attached to the sides of the steel beams 15, sufficient floor rigidity for practical use can be ensured.

[0045] According to the floor structure described above, floor rigidity can be ensured by the floor panels 2 that are directly stacked on the top ends of the steel beams 15 and wooden beams. In other words, there is no need to increase the depth of the floor beams or to stack extra members above or below the floor beams, which prevents the ceiling height and window opening height of the lower floors from being reduced more than necessary. Thus, the dimensional fit in the height direction, including the floor panels 2, is streamlined, sufficient floor rigidity is ensured, and workability is also improved.

[0046] The technical scope of the invention disclosed herein should not be construed as being limited by the exemplified embodiments, but should be construed conceptually based on the claims. The names of elements used in the claims and the specification are for convenience in making the invention easier to understand, and the names do not unnecessarily limit the concepts or properties of the elements. When implementing the invention disclosed herein, the detailed shape, dimensions, structure, materials, quantity, connection form with other elements, relative positional relationship, etc. of elements not specifically specified in the claims may be appropriately modified within the scope of utilizing an operating principle substantially equivalent to the exemplified embodiments or within the scope of obtaining effects substantially equivalent to or greater than those of the exemplified embodiments.

[0047] The invention disclosed in this application can be suitably used as a floor structure when a rigid floor construction method is adopted in a building having a frame structure made of a mixture of wood and steel.

[0048] 1 Floor structural surface 11, 12 Column 13, 16, 17 Wooden beam 131 Slit 132 Pin member insertion hole 14 Laminated beam 15 Steel beam 151 Web 152 Lower flange 153 Upper flange 154 Stiffener 155 Stiffener mounting hole 156 Web connection hole 18 Auxiliary support 2 (21, 22) Floor panel 3 Beam support hardware 31 Attachment base 32 Beam insertion piece 33 Through hole 34 Receiving groove 41, 42, 43, 44, 45 Bolt 46, 47 Drift pin 5 Steel beam connecting hardware 51 Mounting base 52 Web joint piece 53 Mounting hole 54 Splice plate 61 Floor panel support beam 611 Slit 612 Pin member insertion hole 62 Floor panel support block 621 Step portion 622 Pin member insertion hole 7 Beam support hardware support 71 Support piece 72 Widening piece 73 Beam support support piece 74 Bolt insertion hole 81 Nail 82 Clip

Claims

1. At least one floor panel receiving member made of a wooden material is attached to the side of a steel beam constituting at least one side of the floor surface, the top ends of the steel beam and the floor panel receiving member are aligned flush, at least one floor panel made of a wooden material is laid on the steel beam and the floor panel receiving member, and the floor panel is fastened to the floor panel receiving member by nails or screws. A floor structure characterized by the above.

2. In the floor structure according to claim 1, the floor panel receiving member is a floor panel receiving beam having a predetermined material length and arranged in parallel with the steel beam, with a rectangular cross-section, and at least a pair of beam receiving fittings are attached to the side surface of the web of the steel beam with an interval corresponding to the material length of the floor panel receiving beam, and the floor panel receiving beam is attached to the side of the steel beam by joining both ends thereof to the pair of beam receiving fittings respectively. A floor structure characterized by the above.

3. In the floor structure according to claim 2, the beam receiving fitting has a long rectangular attachment base that is connected to the steel beam side via appropriate connecting means and held in a posture perpendicular to the material axis of the steel beam, and a pair of beam insertion pieces that are refracted at right angles in plan view from both side edges of the attachment base and extend parallel to the material axis of the steel beam. A receiving groove is formed at the upper edge of the beam insertion piece, and a plurality of through holes are formed at the middle part of the beam insertion piece. The beam insertion piece is inserted into a slit formed at the end of the floor panel receiving beam, and a pin member that intersects the slit and penetrates the floor panel receiving beam in the beam width direction engages with the receiving groove or the through hole of the beam insertion piece, whereby the floor panel receiving beam is joined to the beam receiving fitting. A floor structure characterized by the above.

4. In the floor structure according to claim 3, the connecting means for connecting the beam receiving fitting to the steel beam includes at least one stiffener coupled to the side surface of the steel beam in a direction perpendicular to the material axis of the steel beam, and at least one beam receiving fitting support projecting to the side of the steel beam and connected to the stiffener. A floor structure characterized by the above.

5. In the floor structure according to claim 4, the attachment base of the beam receiving fitting is bolted and nut-fastened to the beam receiving fitting support. A floor structure characterized by the above.

6. In the floor structure according to claim 5, at least a pair of the beam receiving fittings are connected so as to face each other with the beam receiving fitting support sandwiched between the attachment bases thereof. A floor structure characterized by this.

7. In the floor structure according to claim 1, the floor panel receiving member is a floor panel receiving block in which a plate piece having the same thickness as the upper flange of the steel beam is laminated on a part of the upper surface of a rectangular parallelepiped, or a recessed portion having the same thickness as the upper flange of the steel beam is formed. The attachment means for attaching the floor panel receiving block to the steel beam is at least a pair of stiffeners that are coupled to the side surface of the steel beam in a direction orthogonal to the material axis of the steel beam and face each other at intervals corresponding to the length of the floor panel receiving block, and a plurality of pin members that penetrate the floor surface material receiving block in the length direction and engage with a plurality of attachment holes formed in the pair of stiffeners. A floor structure characterized by being configured to include this.

8. In the floor structure according to claim 1, claim 2, or claim 7, the floor panel is arranged such that a portion laid on the steel beam and a portion laid on the floor panel receiving member are separated along the boundary between the steel beam and the floor panel receiving member. The floor panel of the portion laid on the steel beam is fastened to the top end of the steel beam via an adhesive, double-sided tape, or clip. A floor structure characterized by this.

9. In the floor structure according to claim 1, claim 2, or claim 7, the edge of the portion of the floor panel laid on the floor panel receiving member is arranged to project onto the steel beam across the boundary between the steel beam and the floor panel receiving member, and is fastened to the floor panel receiving member with nails or screws. A floor structure characterized by this.

10. In the floor structure according to claim 1, claim 2, or claim 7, the edge of the portion of the floor panel laid on the steel beam is arranged to project onto the floor panel receiving member across the boundary between the steel beam and the floor panel receiving member, and is fastened to the floor panel receiving member with nails or screws. A floor structure characterized by this.

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