RC structure

Abstract

The challenge is to enable the attachment of an axial force transmission plate, such as a fixing plate, to the anchor bolt without using two nuts, one at the top and one at the bottom. [Solution] The anchor (2) comprises an anchor bolt (20) having a thread (20a or 20b) and an axial force transmission plate (21 or 30) having a female thread (21b) that is screwed onto the male thread (20a or 20b). The RC structure (1) comprises a reinforced concrete main body (6), an anchor bolt (20) embedded in the main body (6) and protruding from the main body (6) and having a male thread (20a or 20b), and an axial force transmission plate (21 or 30) embedded in the main body (6) and having a female thread (21b) that is screwed onto the male thread (20a or 20b).

Description

Technical Field

[0001] The technology disclosed in the present specification relates to an anchor and an RC structure.

Background Art

[0002] Patent Document 1 discloses an anchor bolt installed on a continuous footing of a reinforced concrete structure. A fixing plate is attached to a lower end of the anchor bolt. Specifically, an external thread portion at the lower end of the anchor bolt penetrates the fixing plate, two nuts, one upper and one lower, are screwed onto the external thread portion on the upper side and the lower side of the fixing plate respectively, and the fixing plate is clamped between these two nuts.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0004] A problem to be solved by the technology disclosed in the present specification is to enable an axial force transmission plate such as a fixing plate to be attached to an anchor bolt without using two upper and lower nuts.

Means for Solving the Problem

[0005] Reference signs shown in parentheses below are referenced in Figs. 1 to 3.

[0006] In order to solve the above problems, according to claim 1, there is provided an anchor (2) comprising: an anchor bolt (20) having an external thread (20a or 20b); and an axial force transmission plate (21 or 30) having an internal thread (21b) screwed onto the external thread (20a or 20b).

[0007] According to claim 6, an RC structure (1) is provided, comprising: a main body (6) made of reinforced concrete; an anchor bolt (20) embedded in the main body (6) and protruding from the main body (6) and having a male thread (20a or 20b); and an axial force transmission plate (21 or 30) embedded in the main body (6) and having a female thread (21b) that is screwed onto the male thread (20a or 20b).

[0008] According to claim 1 or 6 as described above, the axial force transmission plate (21 or 30) is attached to the anchor bolt (20) by screwing the male thread (20a or 20b) of the anchor bolt (20) to the female thread (21b) of the axial force transmission plate (21 or 30). The attachment of the axial force transmission plate (21 or 30) to the anchor bolt (20) is achieved even without nuts on both the top and bottom of the axial force transmission plate (21 or 30).

[0009] According to claim 2, the axial force transmission plate (21 or 30) has a notch on its outer circumference.

[0010] According to claim 2 as described above, when the axial force transmission plate (21 or 30) and the anchor bolt (20) are embedded in a reinforced concrete structure, the concrete catches on the notches of the axial force transmission plate (21 or 30). This contributes to preventing the rotation of the anchoring plate, and consequently to preventing the anchor bolt (20) and the anchoring plate from rotating together.

[0011] According to claim 3, the anchor comprises a nut (22) that is screwed onto the male screw (20a or 20b), and the nut (22) and the axial force transmission plate (21 or 30) are tightened against each other.

[0012] According to claim 3 described above, the mutual tightening of the nut (22) and the axial force transmission plate (21 or 30) contributes to preventing the loosening of the nut (22) and the axial force transmission plate (21 or 30).

[0013] According to claim 4, the nut (22) is a rectangular nut (22).

[0014] According to claim 4 as described above, when the rectangular nut (22), axial force transmission plate (21 or 30), and anchor bolt (20) are embedded in a reinforced concrete structure, the corners of the rectangular nut (22) catch on the concrete. This contributes to preventing the rotation of the rectangular nut (22), and consequently to preventing the anchor bolt (20) and the rectangular nut (22) from rotating together.

[0015] According to claim 5, the axial force transmission plate (21 or 30) protrudes outward from the outer circumference of the nut (22).

[0016] According to claim 5 described above, if the axial force transmission plate (21 or 30) is embedded in a reinforced concrete structure or placed against the surface of the structure, the axial load of the anchor bolt (20) is transmitted to the reinforced concrete structure by the axial force transmission plate (21 or 30). [Effects of the Invention]

[0017] The axial force transmission plate can be attached to the anchor bolt even without nuts on both the top and bottom of the plate. [Brief explanation of the drawing]

[0018] [Figure 1] Figure 1 is a vertical cross-sectional view of the boundary between the reinforced concrete (RC) structure of a building and its wooden frame, as well as its vicinity. [Figure 2] Figure 2 is a vertical cross-sectional view of the boundary between the reinforced concrete (RC) structure and the wooden frame, and its vicinity. [Figure 3] Figure 3 is an exploded perspective view of the lower part of the anchor. [Modes for carrying out the invention]

[0019] Hereinafter, embodiments will be described with reference to the drawings. Features and technical effects of the embodiments can be understood from the following detailed description and the drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. The drawings are provided for illustration only, and therefore the scope of the present invention is not limited to the illustrations in the drawings.

[0020] FIG. 1 and FIG. 2 are vertical sectional views of the boundary between the RC (Reinforced Concrete) structure 1 and the wooden frame 11 of a building at the outer periphery of the building and the vicinity thereof. The cross section in FIG. 1 is orthogonal to the cross section in FIG. 2.

[0021] The building comprises the RC structure 1 and the wooden frame 11.

[0022] In the example shown in FIG. 1 and FIG. 2, the RC structure 1 is a foundation of the building, more specifically a strip foundation. In contrast, the RC structure 1 may be designed and modified to be a mat foundation. The RC structure 1 may be designed and modified to be a lower frame of the building. The lower frame of the building may be at least the first floor of the building. The lower frame of the building may constitute a basement part of the building in addition to the first floor part of the building. The lower frame of the building may constitute two or more upper floors of the building in addition to the first floor part of the building. The lower frame of the building may be either a wall structure or a rigid-frame structure.

[0023] The main body portion of the RC structure 1 has a rising portion 6. In the example shown in FIG. 1 and FIG. 2, since the RC structure 1 is a strip foundation, the rising portion 6 rises from a reinforced concrete footing or an underground beam. When the RC structure 1 is a mat foundation, the rising portion 6 rises from a reinforced concrete slab. When the RC structure 1 is a lower part of the building, the rising portion 6 rises from a reinforced concrete beam or slab. The beam may be a beam in a rigid-frame structure. The beam may be a girder or a beam-wall constructed at an upper part of a wall in a wall structure.

[0024] The RC structure 1 has a solidified layer 10. The solidified layer 10 is formed on the rising portion 6. The solidified layer 10 is a hardened self-leveling material, cement, or mortar.

[0025] In the examples shown in Figures 1 and 2, the wooden frame 11 is either a wall-type structure or a combination of a wall-type structure and a frame structure. However, the wooden frame 11 may be redesigned to be a frame structure. Here, a wall-type structure refers to one in which the loads of the wooden frame 11 and the loaded objects, as well as seismic forces, are supported by walls. Here, a frame structure refers to one in which the loads of the wooden frame 11 and the loaded objects, as well as seismic forces, are supported by columns and beams, and further supported by bracing as needed.

[0026] A base ring 12, such as a ventilation base ring, is provided on top of the solidification layer 10, and a wooden base 14 of the wooden frame 11 is provided on top of the base ring 12. However, the base ring 12 may not be provided, and the base 14 may be provided directly on top of the solidification layer 10. The base 14 is provided along the outer perimeter of the building.

[0027] In addition, if the RC structure 1 is the lower part of the building, the rising section 6 may not be provided. In this case, the base 14 and the base ring 12 are provided on the beam or slab of the RC structure 1.

[0028] The lowest floor 15 of the wooden frame 11 is laid inside the foundation 14, and the outer perimeter of the floor 15 is placed on the base ring 12. The floor 15 is composed of multiple structural floor panels 16 used in the wood panel adhesive construction method. Each structural floor panel 16 has a rectangular frame 16a and a facing material 16b attached to the upper surface of the frame 16a. The floor 15 is constructed by arranging the multiple structural floor panels 16 in a horizontal position. Adjacent structural floor panels 16 in the horizontal direction are joined by adhesive, bolt fasteners, or fixing hardware. Adjacent structural floor panels 16 in the horizontal direction may also be joined by placing a beam between them.

[0029] The lowest floor wall 17 of the wooden frame 11 is installed on the foundation 14. Since the wooden frame 11 is a wall-type structure or a combination of a wall-type structure and a frame structure, the wall 17 is a load-bearing wall made of wood. For example, the wall 17 is made up of multiple structural wall panels 18 used in a wood panel adhesive construction method. The structural wall panel 18 has a rectangular frame 18a and facing materials 18b attached to both sides of the frame 18a. Auxiliary bracing members may be assembled inside the frame 18a. The structural wall panel 18 is joined to the foundation 14 by adhesive, bolt and nut fasteners, or fixing hardware. The wall 17 is made up of multiple structural wall panels 18 arranged in an upright position. Since Figures 1 and 2 are cross-sectional views of the outer perimeter of the building, the wall 17 is an exterior wall.

[0030] Adjacent structural wall panels 18 in the horizontal direction are joined together by adhesive, bolt fasteners, or fixing brackets, or by placing a bonding material 19 between them.

[0031] The connecting member 19 is a column of the wooden frame 11. The connecting member 19 is erected between structural wall panels 18 positioned on both sides of it. The connecting member 19 is joined to the structural wall panels 18 positioned on both sides of it by adhesive, bolt and nut fasteners, or fixing hardware. The connecting member 19 has a wooden body 19a shaped like a rectangular bar and a metal core 19b embedded inside the body 19a along the central axis of the body 19a. The core 19b is a fully threaded bolt. The upper and lower ends of the core 19b protrude from the body 19a.

[0032] The lower end of the connecting member 19 is connected to the box-shaped metal fitting 50. The box-shaped metal fitting 50 is provided in the shape of a rectangular box. The box-shaped metal fitting 50 has a rectangular cavity inside. The box-shaped metal fitting 50 has an opening on its side that leads from the side of the box-shaped metal fitting 50 to the cavity. The box-shaped metal fitting 50 has an upper through hole on its upper surface that leads from above the box-shaped metal fitting 50 to the cavity. The box-shaped metal fitting 50 has a lower through hole on its lower surface that leads from above the box-shaped metal fitting 50 to the cavity.

[0033] The lower end of the core material 19b is inserted into the upper through-hole of the box-shaped metal fitting 50. The lower end of the core material 19b is screwed into the cavity of the box-shaped metal fitting 50 onto a nut 61, and the nut 61 is tightened against the top surface inside the cavity. In this way, the lower end of the connecting member 19 is connected to the box-shaped metal fitting 50.

[0034] The box-shaped metal fitting 50 is installed on the base 14. The box-shaped metal fitting 50 extends over the upper part of the outer perimeter of the floor 15 from above the base 14.

[0035] The reinforced concrete (RC) structure 1 has an anchor 2, and the wooden frame 11 is fastened to the RC structure 1 by the anchor 2. The anchor 2 comprises an anchor bolt 20, an axial force transmission plate 21, a rectangular nut 22, and an axial force transmission plate 30.

[0036] The anchor bolts 20 are embedded in the vertical section 6 in a vertical position. The anchor bolts 20 protrude upward from the vertical section 6 and further penetrate the solidification layer 10, protruding upward from the solidification layer 10. Note that if the RC structure 1 is the lower part of the building, the vertical section 6 may not be provided. In this case, the anchor bolts 20 are embedded in the beam or slab of the RC structure 1.

[0037] Figure 3 is a perspective view of the lower part of the anchor bolt 20. As shown in Figure 3, the anchor bolt 20 has a lower male thread 20a at its lower end. As shown in Figures 1 and 2, the anchor bolt 20 has an upper male thread 20b at its upper end.

[0038] The axial force transmission plate 21 is attached to the lower part of the anchor bolt 20. The attachment of the axial force transmission plate 21 to the anchor bolt 20 will be described in detail below.

[0039] As shown in Figure 3, the axial force transmission plate 21 is disc-shaped. Multiple rectangular notches 21a are formed on the outer circumference of the axial force transmission plate 21. These notches 21a are arranged circumferentially at equal intervals. The axial force transmission plate 21 has a female thread 21b in its center. The lower male thread 20a of the anchor bolt 20 is screwed to the female thread 21b of the axial force transmission plate 21. Furthermore, the lower male thread 20a of the anchor bolt 20 is screwed to a rectangular nut 22 on the underside of the axial force transmission plate 21. The rectangular nut 22 and the axial force transmission plate 21 tighten against each other, preventing loosening of the rectangular nut 22 and the axial force transmission plate 21. The screwing of the male and female threads is also called threading or meshing.

[0040] The notch 21a is provided for rotating the axial force transmission plate 21 with a tool. In other words, when installing the anchor bolt 20 or before installation, the installer hooks a tool into the notch 21a and rotates the axial force transmission plate 21 relative to the anchor bolt 20 with the tool. This allows the installer to install, remove, adjust the position of, tighten or loosen the axial force transmission plate 21.

[0041] The area of ​​the axial force transmission plate 21 in the plane perpendicular to the axial direction of the anchor bolt 20 is larger than the area of ​​the rectangular nut 22 in the plane perpendicular to the axial direction of the anchor bolt 20. The axial force transmission plate 21 extends outward from the outer circumference of the rectangular nut 22.

[0042] The axial force transmission plate 21 and the rectangular nut 22 are embedded in the rising section 6 together with the anchor bolt 20. The upward tensile load of the anchor bolt 20 is transmitted to the rising section 6 by the axial force transmission plate 21, and the pulling out of the anchor bolt 20 is prevented by the axial force transmission plate 21. The axial force transmission plate 21 is also called a fixing plate. The downward pushing load of the anchor bolt 20 is also transmitted to the rising section 6 by the axial force transmission plate 21. Preventing loosening of the rectangular nut 22 and the axial force transmission plate 21 due to mutual tightening ensures the reliable transmission of such loads.

[0043] The concrete of the rising section 6 catches on the notch 21a of the axial force transmission plate 21. This helps prevent the rotation of the axial force transmission plate 21, and consequently helps prevent the anchor bolt 20 and the axial force transmission plate 21 from rotating together.

[0044] Because the rectangular nut 22 is rectangular in shape, its corners catch on the concrete of the rising portion 6. This helps prevent the rectangular nut 22 from rotating, and consequently helps prevent the anchor bolt 20 and the rectangular nut 22 from rotating together.

[0045] As shown in Figures 1 and 2, the axial force transmission plate 30 is attached to the anchor bolt 20 at a position higher than the axial force transmission plate 21. The axial force transmission plate 30 is identical to the axial force transmission plate 21. Therefore, the axial force transmission plate 30 is disc-shaped, with multiple rectangular notches formed on its outer circumference, and a female thread formed in the center of the axial force transmission plate 30. The upper male thread 20b of the anchor bolt 20 is screwed into the female thread of the axial force transmission plate 30.

[0046] In the examples shown in Figures 1 and 2, the axial force transmission plate 30 is embedded in the rising portion 6 near the surface of the rising portion 6, and the upper surface of the axial force transmission plate 30 is flush with the interface between the rising portion 6 and the solidified layer 10. However, the axial force transmission plate 30 may protrude upward from the interface between the rising portion 6 and the solidified layer 10, and a part of the axial force transmission plate 30 may be embedded in the solidified layer 10. The entire axial force transmission plate 30 may be embedded in the solidified layer 10, in which case the upper surface of the axial force transmission plate 30 may be exposed so as to be flush with the surface of the solidified layer 10, or the upper surface of the axial force transmission plate 30 may not be exposed. In any case, the axial force transmission plate 30 is embedded in the solidified layer 10, the rising portion 6, or both, and the upper surface of the axial force transmission plate 30 is below the surface of the solidified layer 10.

[0047] Since the notch is formed on the outer circumference of the axial force transmission plate 30, rotation of the axial force transmission plate 30 is prevented, and consequently, the joint rotation of the anchor bolt 20 and the axial force transmission plate 30 is prevented.

[0048] Alternatively, a rectangular nut may be screwed onto the upper male thread 20b of the anchor bolt 20 on the axial force transmission plate 30. The rectangular nut is embedded in the solidified layer 10, the rising portion 6, or both, and the upper surface of the rectangular nut is below the surface of the solidified layer 10. The rectangular nut and the axial force transmission plate 30 tighten against each other, preventing loosening of both the rectangular nut and the axial force transmission plate 30.

[0049] The downward pushing load of the anchor bolt 20 is transmitted to the rising section 6 by the axial force transmission plate 30.

[0050] The anchor bolts 20 penetrate the base ring 12 vertically above the solidified layer 10. The anchor bolts 20 penetrate the sill 14 and floor 15 vertically above the base ring 12. Here, a first groove is formed on the side of the sill 14 from the top surface to the bottom surface of the sill 14, and a second groove is formed on the outer circumference of the floor 15 from the top surface of the surface material 16b of the floor panel 16 to the bottom surface of the frame 16a. The first groove and the second groove are combined laterally to form a through hole, and the anchor bolts 20 penetrate this through hole vertically.

[0051] The fitting 40 is attached to the anchor bolt 20 on the base 14 and floor 15. The fitting 40 is the same as the axial force transmission plate 21. Therefore, the fitting 40 is disc-shaped, with multiple rectangular notches formed on its outer circumference, and a female thread formed in the center of the fitting 40. The upper male thread 20b of the anchor bolt 20 is screwed into the female thread of the fitting 40. In the example shown in Figures 1 and 2, the fitting 40 floats slightly above the upper surface of the base 14 and floor 15. Alternatively, the fitting 40 may be used to fasten the base 14, floor 15 and base ring 12 toward the solidified layer 10 and the rising section 6.

[0052] The upper end of the anchor bolt 20 is inserted into the lower through-hole of the box-shaped metal fitting 50. The upper end of the upper male thread 20b of the anchor bolt 20 is screwed into a nut 62 inside the cavity of the box-shaped metal fitting 50, and the nut 62 is tightened against the bottom surface inside the cavity. In this way, the anchor bolt 20 is connected to the box-shaped metal fitting 50.

[0053] Since anchor 2 is provided in the RC structure 1, the wooden frame 11 can be constructed on top of the RC structure 1. The energy used from the production to the disposal of timber is less than the energy used from the production to the disposal of metal or concrete materials. Therefore, this RC structure 1 contributes to the realization of a decarbonized society by promoting carbon neutrality, which effectively reduces carbon dioxide emissions to zero, and to the achievement of the Sustainable Development Goals (SDGs).

[0054] <Variation> (1) In the above embodiment, the anchor 2 is used to fasten the wooden frame 11, in particular the connecting member 19, to the RC structure 1. Alternatively, the anchor may be used to fasten a steel column to an RC structure such as a footing, foundation, or underground beam. Alternatively, the anchor may be used to fasten a seismic isolation device to an RC structure such as a footing, foundation, or underground beam.

[0055] (2) In the above embodiment, the rectangular nut 22 is screwed to the lower male thread 20a below the axial force transmission plate 21. Alternatively, the rectangular nut 22 may be screwed to the lower male thread 20a above the axial force transmission plate 21.

[0056] (3) The rectangular nut 22 does not need to be provided.

[0057] <Summary> The embodiments disclosed herein are for illustrative purposes only and are not intended to limit the scope of the invention. The scope of the invention should be interpreted by the terms of the claims. [Explanation of Symbols]

[0058] 1 RC structure 2 Anchors 6. Rising section 20 Anchor bolts 20a Lower Male Thread 20b Upper male thread 21 Axial force transmission plate 21a Notch 21b Female thread 22 Rectangular nuts 30 Axial force transmission plate

Claims

1. An anchor bolt having a male thread, An axial force transmission plate having a female thread that is screwed onto the male thread, An anchor equipped with this feature.

2. The axial force transmission plate has a notch on its outer circumference. The anchor according to claim 1.

3. The male screw is equipped with a nut that is screwed onto it, The nut and the axial force transmission plate are tightened against each other. The anchor according to claim 1 or 2.

4. The nut is a rectangular nut. The anchor according to claim 3.

5. The axial force transmission plate protrudes outward from the outer circumference of the nut. The anchor according to claim 3.

6. The main body is made of reinforced concrete, An anchor bolt embedded in the main body and protruding from the main body, having a male thread, An axial force transmission plate having a female thread that is screwed onto the male thread and embedded in the main body, An RC structure equipped with [a specific feature].

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