Joining structure

Abstract

An object of the present invention is to suppress pull-out, breakage, plastic deformation, and the like of first and second embedded anchors during an earthquake or the like.SOLUTION: The joint structure includes a structural part 10, a base 21 disposed on the structural part 10, a wall panel 24 on the base 21, embedded anchors 4050 protruding from an upper surface of the structural part 10, and fastening nuts 4252 respectively fastened to the embedded anchors 4050, wherein the wall panel 24 has a wooden rectangular frame side 24a and a surface material side 24a attached to the rectangular frame side 24b, and the base 21 has a concave side 21a on an upper surface thereof. The embedded anchor 40 is fitted and passed through the through-hole 21b of the sill 21, the nut 42 fastens the sill 21 to the structural part 10 in the recess 21a, the embedded anchor 50 is passed through the through-hole 21c of the sill 21 with play, the embedded anchor 50 is passed through the through-hole 24e of the lower rail, and the fastening nut 52 fastens the lower rail and the sill 21 to the structural part 10 in the hollow.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint structure. [Background technology]

[0002] Patent Document 1 discloses a technique in which first-floor wall panels are installed via a base on the rising portion of a foundation. A plurality of anchor bolts are embedded in the base at intervals along the longitudinal direction of the base, protruding upward. Insertion holes are provided in the base so as to penetrate vertically, and column connectors to be joined to the lower ends of the column materials of the wall panel are inserted into the insertion holes, and the column connectors are attached to the anchor bolts. Insertion holes are provided in the lower ends of the column materials of the wall panel so as to open downward, and the column connectors are inserted into the insertion holes. The lower ends of the column materials of the wall panel are joined to the column connectors with pins. However, as buildings become taller, their weight increases, and anchor bolts may not be able to withstand the horizontal and vertical loads of the wall panels during earthquakes, resulting in the anchor bolts being pulled out of the foundation, or the column joint fittings and anchor bolts being damaged or plastically deforming. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-080578 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to prevent the first and second embedded anchors from being pulled out, damaged, or plastically deformed during an earthquake or the like. [Means for solving the problem]

[0005] The following reference numerals in parentheses refer to FIGS. 1 to 6.

[0006] In order to solve the above problems, according to claim 1, A joint structure comprising a reinforced concrete structure (10), a base (21) placed on the reinforced concrete structure (10), and a structural member (24) provided on the base (21), First and second embedded anchors (40, 50) that are embedded in the reinforced concrete structure (10) and protrude from the upper surface of the reinforced concrete structure (10); and first and second fastening members (42, 52) fastened to the first and second embedded anchors (40, 50), respectively; The structural member has a cross member resting on the base (21), The base (21) has a recess (21a) on its upper surface, The first embedded anchor (40) penetrates the base (21) from the underside of the base (21) to the recess (21 a), the first fastening member (42) is screwed to the first embedded anchor (40) within the recess (21 a), and the first fastening member (42) fastens the base (21) to the reinforced concrete structure (10); The second embedded anchor (50) penetrates from the underside of the foundation (21) to the upper surface of the cross member, and the second fastening member (52) is screwed to the second embedded anchor (50) on the cross member, and the second fastening member (52) fastens the cross member and the foundation (21) to the reinforced concrete structure (10). A joining structure characterized by the above is provided.

[0007] According to claim 2, the structural material (24) may be a wall panel (24). The wall panel (24) has a wooden rectangular frame (24a) having a pair of horizontal stiles at the top and bottom and a pair of vertical stiles at the side, a face material (24b) attached to the rectangular frame (24a) so as to cover the inside of the rectangular frame (24a), and a hollow (24d) surrounded by the rectangular frame (24a) and the face material (24b), and the horizontal material is the lower of the pair of horizontal stiles.

[0008] According to claim 3, the first embedded anchor (40) transmits horizontal shear force between the foundation (21) and the reinforced concrete structure (10), and the second embedded anchor (50) transmits upward tensile force from the structural member (24) and the foundation (21) to the reinforced concrete structure (10).

[0009] According to claim 4, the second embedded anchor (50) transmits horizontal shear force between the foundation and the reinforced concrete structure, and the horizontal shear force burden of the second embedded anchor (50) is smaller than the horizontal shear force burden of the first embedded anchor (40).

[0010] According to claim 1, 2, 3 or 4, the first embedded anchor (40) contributes to the transmission of horizontal shear force, and the second embedded anchor (50) contributes to the transmission of upward tensile force, thereby dispersing the load. Therefore, pull-out, damage, plastic deformation, etc. of the first and second embedded anchors (40, 50) are suppressed during earthquakes, etc.

[0011] According to claim 5, The joining structure according to claim 2, The face material (24b) has an opening (24f) formed on the side of the second fastening member (52). A joining structure characterized by the above is provided.

[0012] According to the fifth aspect of the invention, the second fastening member (52) can be fastened through the opening (24f). [Effects of the Invention]

[0013] The present invention contributes to suppressing pull-out, breakage, plastic deformation, etc. of the first and second embedded anchors during earthquakes, etc. [Brief explanation of the drawings]

[0014] [Figure 1] Figure 1 is a side view of the building. [Figure 2]FIG. 2 is a vertical cross-sectional view of the upper part of the outer periphery of the first structural part. [Figure 3] FIG. 3 is a vertical cross-sectional view taken along line III-III shown in FIG. [Figure 4] FIG. 4 is a vertical cross-sectional view taken along line IV-IV shown in FIG. [Figure 5] FIG. 5 is a vertical cross-sectional view of the upper part of the outer periphery of the first structural portion in the second embodiment. [Figure 6] FIG. 6 is a vertical cross-sectional view of the upper part of the outer periphery of the first structural portion in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments will be described with reference to the drawings. Features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Because the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the examples in the drawings.

[0016] First Embodiment FIG. 1 is a side view of building 1. Building 1 is multi-story, specifically four stories tall. The skeleton of building 1 comprises a first structural section 10 and a second structural section 20. First structural section 10 constitutes the lower part of building 1, more specifically the foundation and first floor. First structural section 10 is a reinforced concrete structure. Second structural section 20 constitutes the upper part of building 1, more specifically the second to fourth floors. Second structural section 20 is a wooden structure. Second structural section 20 has a wall structure or a composite structure that combines a wall structure and a frame structure. Wall structure refers to a structure in which the load and seismic force of building 1 are supported by walls. Frame structure refers to a structure in which the load and seismic force of building 1 are supported by columns, beams, and braces. Second structural section 20 may be constructed using a panel construction method, a frame panel construction method, or a wooden frame construction method. In one example, the second structural section 20 is a wooden structure with a wall structure constructed using a wood panel adhesive construction method, which is a type of panel construction method, and its main components are wood panels. The wood panels are structural materials that support the weight and seismic forces of the building 1. The wood panels have a wooden frame assembled into a rectangular frame shape, wooden face panels attached to the front and back surfaces of the frame, and wooden auxiliary crosspieces arranged vertically, horizontally, or vertically and horizontally inside the frame. The wood panels may also have insulation filled inside the rectangular frame.

[0017] The first structural part 10 has a foundation made of reinforced concrete in the ground. The foundation may have a mat foundation, a strip foundation, a footing, an underground beam, or a pile foundation, or a combination of any of these. The first structural part 10 has a first floor made of reinforced concrete on top of the foundation. The first floor has a wall structure, a rigid frame structure, or a combination of these. The first structural part 10 may have a basement between the first floor and the foundation.

[0018] FIG. 2 is a vertical cross-sectional view of the upper part of the outer periphery of the first structural section 10. FIG. 3 is a vertical cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a vertical cross-sectional view taken along line IV-IV in FIG. 2. The first structural section 10 has a reinforced concrete wall 11 erected on a foundation in the first floor section. The wall 11 is an exterior wall provided along the periphery of the first floor section. The first structural section 10 has a beam 12 provided on the upper end of the wall 11. The beam 12 extends along the periphery of the building 1. The first structural section 10 has a reinforced concrete slab 13 that extends horizontally at ceiling level of the first floor section. The periphery of the slab 13 is joined to the beam 12. The first structural section 10 has a reinforced concrete rising section 14 provided on the beam 12. The rising section 14 is provided along the periphery of the building 1. The rising section 14 is formed to protrude above the top surface of the slab 13. The rising portion 14 is disposed below on the outer wall of the second floor of the second structural portion 20. A leveling layer 15 is deposited and solidified on the upper surfaces of the rising portion 14 on the outer wall 23 and the rising portion on the inner wall 24. Note that the leveling layer 15 does not necessarily have to be formed.

[0019] The second structural section 20 has a square-bar-shaped wooden base 21 and architrave 22 at the lower end of the outer periphery of the second floor. The architrave 22 is provided on the rising section 14. The base 21 lies on the architrave 22 and extends horizontally along the outer periphery of the second floor. Note that the architrave 22 may not be provided, and the base 21 may lie on the rising section 14.

[0020] The second structural section 20 has an exterior wall 23 around the periphery of the second floor. The exterior wall 23 is erected on a foundation 21. The exterior wall 23 has multiple wall panels 24 arranged along the periphery of the second floor. The wall panels 24 are structural materials that support the weight and seismic forces of the building 1, and more specifically, are hollow wooden panels. The wall panel 24 has a wooden rectangular frame 24a formed into a rectangular shape. The rectangular frame 24a has a pair of horizontal stiles at the top and bottom as horizontal members and a pair of vertical stiles at the sides as vertical members. The wall panel 24 further has two wooden face panels 24b and 24c attached to the front and rear surfaces of the rectangular frame 24a, respectively, to cover the inside of the rectangular frame 24a, and one or more wooden auxiliary crossbeams assembled vertically, horizontally, or vertically and horizontally inside the rectangular frame 24a. The wall panel 24 may have a heat insulating material filled inside the rectangular frame. The wall panels 24 are placed on the base 21, with the undersides of the wall panels 24 abutting against the upper surface of the base 21. Adjacent wall panels 24 may be joined by bolt and nut fasteners, screws, or adhesive. Wooden pillars may be provided between adjacent wall panels 24, with the lower ends of the pillars fixed to the upper ends of the second structural parts 20 by embedded anchors, and the upward tensile force of the pillars may be transmitted to the second structural part 20 by the embedded anchors at the lower ends.

[0021] The lower end of the second structural part 20 is fixed to the upper end of the first structural part 10 by embedded anchors 40, 50. The lower end of the second structural part 20 is fixed to the upper end of the first structural part 10 by a number of embedded anchors in addition to the embedded anchors 40, 50. The embedded anchors 40, 50 are attached to the upper end of the first structural section 10. Specifically, the lower portions of the embedded anchors 40, 50 are embedded in the concrete of the rising section 14 and the beam 12, and the upper portions of the embedded anchors 40, 50 protrude upward from the upper surface of the rising section 14. The embedded anchors 40 are embedded longer into the first structural section 10 than the embedded anchors 50. The embedded anchors 40 protrude shorter from the first structural section 10 than the embedded anchors 50. The embedded anchors 40, 50 are anchor bolts having flanges 40a, 50a at their lower ends that provide pull-out resistance from the concrete. Instead of the flanges 40a, 50a, the lower ends of the embedded anchors 40, 50 may be J-shaped, L-shaped, JA-shaped, LA-shaped, screw-shaped, spiral-shaped, groove-shaped, or nut-shaped pull-out resistors. The embedding depth of the embedded anchors 40 in the first structural portion 10 is greater than the embedding depth of the embedded anchors 50 in the first structural portion 10 .

[0022] The base 21 is joined to the rising portion 14 by embedded anchors 40, 50, bearing plates 41, 51, and fastening nuts 42, 52, and the wall panel 24 is joined to the rising portion 14 by embedded anchors 50, bearing plates 51, and fastening nuts 52. The joining structure between the rising portion 14, the base 21, and the wall panel 24 is configured as follows.

[0023] First, the joining of the base 21 by the embedded anchor 40, the bearing plate 41 and the fastening nut 42 will be described in detail. The base 21 has a recess 21a on its upper surface and a through-hole 21b that penetrates from the bottom of the recess 21a to the underside. An embedded anchor 40 passes through the through-hole 21b, and the head of the embedded anchor 40 protrudes from the through-hole 21b within the recess 21a. The head of the embedded anchor 40 also passes through a support plate 41, and a fastening nut 42 is screwed onto the head of the embedded anchor 40. The head of the embedded anchor 40, the support plate 41, and the fastening nut 42 fit into the recess 21a. Screwing the fastening nut 42 generates a fastening force that causes the support plate 41 to tighten the base 21 toward the rising portion 14.

[0024] Next, the joining of the base 21 and the wall panel 24 by the embedded anchors 40, 50, the bearing plates 41, 51 and the fastening nuts 42, 52 will be described in detail. The base 21 has a through hole 21c that penetrates from its upper surface to its lower surface. The wall panel 24 has a hollow 24d inside that is surrounded by a rectangular frame 24a and face plates 24b and 24c. The wall panel 24 has a through hole 24e that penetrates from the lower surface to the upper surface of the lower horizontal frame of the rectangular frame 24a. The through hole 24e is positioned above the through hole 21c and is continuous with the through hole 21c. An embedded anchor 50 penetrates the through hole 21c and the through hole 24e, and the head of the embedded anchor 50 protrudes from the through hole 24e within the hollow 24d. Furthermore, the head of the embedded anchor 50 penetrates a support plate 51, and a fastening nut 52 is screwed onto the head of the embedded anchor 50. The head of the embedded anchor 50, the support plate 51, and the fastening nut 52 fit within the hollow 24d. An opening 24f is formed in the face plate 24b beside the through-hole 24e, and the head of the embedded anchor 50, the support plate 51, and the fastening nut 52 in the hollow 24d can be reached through the opening 24f from outside the wall panel 24. When the fastening nut 52 is screwed in, the support plate 51 generates a fastening force that tightens the lower horizontal frame of the rectangular frame 24a and the base 21 toward the rising portion 14.

[0025] The embedded anchor 40 transmits the horizontal shear force between the rising portion 14 and the base 21. The embedded anchor 50 transmits the upward tensile force from the wall panel 24 and the base 21 to the rising portion 14. The embedded anchor 50 transmits the horizontal shear force between the base 21 and the wall panel 24, and also bears both the upward tensile force and the horizontal shear force, while the embedded anchor 40 bears the horizontal shear force. Therefore, the horizontal shear force borne by the embedded anchor 50 is smaller than the horizontal shear force borne by the embedded anchor 40.

[0026] Temporary fastening screws 61, 62 are driven obliquely from the surface members 24b, 24c to the lower horizontal frame 24a and the base 21. The lower surface of the lower stile of the rectangular frame 24a may be bonded to the upper surface of the base 21 with an adhesive. The temporary fastening screws 61, 62 contribute to temporarily fastening the wall panel 24 to the base 21 until the adhesive between the lower stile and the base 21 hardens during construction.

[0027] In the same way that the wall panel 24 of the exterior wall 23 and the sill 21 below it are fixed to the rising portion 14 by the embedded anchors 50, the wall panel of the interior wall and the sill below it may be fixed to the rising portion by embedded anchors. In the same way that the sill 21 below the wall panel 24 of the exterior wall 23 is fixed to the rising portion 14 by the embedded anchors 40, the sill below the wall panel of the interior wall may be fixed to the rising portion by embedded anchors.

[0028] The method of installing the wall panel 24 will now be described. A recess 21a is formed in the upper surface of the base 21, and a through hole 21b is drilled from the bottom of the recess 21a to the lower surface of the base 21. A through hole 21c is drilled from the upper surface to the lower surface of the base 21. The recess 21a and the through holes 21b and 21c are processed at the construction site of the building 1 or at a factory.

[0029] The through hole 24e is drilled from the bottom surface to the top surface of the lower horizontal stile of the rectangular frame 24a of the wall panel 24. Then, using a drilling tool such as a hole saw, an opening 24f is opened in the face material 24b next to the through hole 24e. The through hole 24e and the opening 24f are processed at the construction site or factory of the building 1. The through hole 24e and the opening 24f are processed before or after the wall panel 24 is assembled.

[0030] The first structural section 10 is constructed at the construction site of the building 1. Specifically, the formwork, shoring, reinforcing bars, and embedded anchors 40, 50 of the first structural section 10 are assembled, and concrete is poured inside the formwork. After the concrete has cured, a self-leveling material is applied to the surface of the rising section 14. Once the leveling layer 15 has been formed by the hardening of the self-leveling material, the formwork and shoring are dismantled. Note that the application of the self-leveling material may be omitted.

[0031] The base ring 22 is placed on the leveling layer 15. Note that the placement of the base ring 22 may be omitted.

[0032] Next, the embedded anchors 40, 50 are passed through the through holes 21b, 21c of the base 21, respectively, and the base 21 is placed on the base ring 22. Even if the fit tolerance between the embedded anchor 50 and the through hole 21c is strict, the fit tolerance between the embedded anchor 40 and the through hole 21b is loose, so the embedded anchors 40, 50 can be passed through the through holes 21b, 21c, respectively.

[0033] Next, the head of the embedded anchor 40 is passed through the hole in the support plate 41, and the support plate 41 is placed on the bottom of the recess 21a. The fastening nut 42 is screwed onto the head of the embedded anchor 40, and the support plate 41 and base 21 are tightened toward the rising portion 14 by the fastening nut 42.

[0034] Next, embedded anchors 50, to which adhesive has been applied to the underside of the wall panel 24 and the upper surface of the base 21, are passed through the through-holes 21c of the wall panel 24, and the wall panel 24 is placed on the base 21. Note that the application of adhesive may be omitted. Thereafter, the screws 61 and 62 are driven obliquely with respect to the horizontal plane from the face members 24b and 24c to the lower horizontal frame of the rectangular frame 24a and the base 21.

[0035] Next, the support plate 51 is inserted into the hollow 24d of the wall panel 24 through the opening 24f in the wall panel 24, the heads of the embedded anchors 50 are passed through the holes in the support plate 51, and the support plate 51 is placed on the top surface of the lower stile of the rectangular frame 24a. The fastening nut 52 is inserted into the hollow 24d of the wall panel 24 through the opening 24f in the wall panel 24, and the fastening nut 52 is screwed onto the head of the embedded anchor 50, and the support plate 51, lower stile, and base 21 are tightened toward the rising portion 14 by the fastening nut 52. The opening 24f may then be closed with plywood.

[0036] <Second embodiment> In the first embodiment, the exterior wall 23 has a single wall panel 24. In contrast, in the second embodiment, as shown in Figures 5 and 6, the exterior wall 23 has a double wall panel 24. Both of the double wall panels 24 are fixed to the rising portion 14 by embedded anchors 40, as in the first embodiment. Both of the double wall panels 24 are provided on a base 21, as in the first embodiment, and the wall panel 24 and the base 21 below it are fixed to the rising portion 14 by embedded anchors 50, as in the first embodiment.

[0037] <Third embodiment> In the first and second embodiments, the part to which the wall panel 24 and the base 21 are joined is the rising portion 14 of the first structural part 10. In contrast, the same joining structure as that of the wall panel 24, the base 21, and the rising portion 14 may be applied to the joining structure of the rising portion of a strip footing or mat footing, which is a reinforced concrete structure, the base above that, and the wall panel above that.

[0038] <Fourth embodiment> In the first and second embodiments, the lower stile of the wall panel 24 rests on the base 21, the base 21 is fixed to the rising portion 14 of the first structural part 10 by embedded anchors 40, support plates 41, and fastening nuts 42, and the wall panel 24 and the base 21 are fixed to the rising portion 14 of the first structural part 10 by embedded anchors 50, support plates 51, and fastening nuts 52. Alternatively, a horizontal member of a structural member other than the wall panel 24 may rest on the base 21, the base 21 is fixed to the rising portion 14 of the first structural part 10 by embedded anchors 40, support plates 41, and fastening nuts 42, and the horizontal member and the base 21 may be fixed to the rising portion 14 of the first structural part 10 by embedded anchors 50, support plates 51, and fastening nuts 52. The horizontal member is, for example, a joist or floor beam in a frame construction method, or a frame member of a floor slab in a wood-frame construction method. The joists or floor beams are installed between the lower ends of the pillars and rest on the foundation 21.

[0039] <Summary> (1) The embedded anchor 50 bears both upward tensile force and horizontal shear force, whereas the embedded anchor 40 bears horizontal shear force, so the horizontal shear force borne by the embedded anchor 50 is smaller than the horizontal shear force borne by the embedded anchor 40. This distributes the load and prevents the embedded anchors 40, 50 from being pulled out, damaged, or plastically deformed during an earthquake or the like.

[0040] (2) Because the recess 21a is formed on the top surface of the base 21, the support plate 41 and the fastening nut 42 fit therein and do not interfere with the wall panel 24. This contributes to the fastening nut 42 and the support plate 41 tightening only the base 21 of the base 21 and the wall panel 24 toward the rising portion 14.

[0041] (3) The fastening nut 52 can be tightened through the opening 24f.

[0042] (4) Because the first structural section 10 of Building 1 is made of reinforced concrete, Building 1 has high earthquake resistance and a long lifespan. Therefore, Building 1 contributes to achieving goals such as "sustainable urban development" and the "SDGs (Sustainable Development Goals)."

[0043] (5) The second structural section 20 of the building 1 is made of wood. The energy used from production to disposal and disposal of the wood used in the second structural section 20 is less than the energy used from production to disposal and disposal of metal materials or concrete materials. Therefore, the second structural section 20, and ultimately the building 1, contributes to the realization of a decarbonized society by promoting carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and to the achievement of the Sustainable Development Goals (SDGs). [Explanation of symbols]

[0044] 1. Building 10 First structural section (reinforced concrete structure) 14 Rising section 21 Foundation 21a Recess 21b First through hole 21c Second through hole 24 wall panels 24a Rectangular frame 24b, 24c Face material 24d hollow 24e Third Through Hole 40 First buried anchor 42 Fastening nut 50 Second buried anchor 52 Fastening nut

Claims

1. A joint structure comprising a reinforced concrete structure, a foundation placed on the reinforced concrete structure, and a structural member provided on the foundation, first and second embedded anchors that are embedded in the reinforced concrete structure and protrude from an upper surface of the reinforced concrete structure; first and second fastening members fastened to the first and second embedded anchors, respectively; the structural member has a cross member resting on the base, The base has a recess on its upper surface, The first embedded anchor penetrates the foundation from the underside of the foundation to the recess, the first fastening member is screwed into the first embedded anchor within the recess, and the first fastening member fastens the foundation to the reinforced concrete structure; The second embedded anchor penetrates from the underside of the foundation to the upper surface of the cross member, and the second fastening member is screwed to the second embedded anchor on the cross member, and the second fastening member fastens the cross member and the foundation to the reinforced concrete structure. A joining structure characterized by:

2. The joining structure according to claim 1, the structural material is a wall panel; The wall panel has a wooden rectangular frame having a pair of horizontal stiles at the top and bottom and a pair of vertical stiles at the sides, and a surface material attached to the rectangular frame so as to cover the inside of the rectangular frame, The horizontal member is the lower horizontal member of the pair of horizontal members. A joining structure characterized by:

3. The joining structure according to claim 1 or 2, The first embedded anchor transmits horizontal shear force between the foundation and the reinforced concrete structure, and the second embedded anchor transmits upward tensile force from the structural member and the foundation to the reinforced concrete structure. A joining structure characterized by:

4. The joining structure according to claim 1 or 2, the second embedded anchor transmits horizontal shear forces between the foundation and the reinforced concrete structure; The horizontal shear force load of the second embedded anchor is smaller than the horizontal shear force load of the first embedded anchor. A joining structure characterized by:

5. The joining structure according to claim 2, The face material has an opening formed on the side of the second fastening member. A joining structure characterized by:

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