Column-foundation joint structure

Abstract

To provide a column-foundation joint structure capable of improving the toughness performance of a joint between a wooden column and a foundation.SOLUTION: The column-foundation joint structure includes: a wooden column; a foundation arranged below the wooden column; and an anchor member that has a first part placed inside the foundation and is in a non-bonded status with the foundation and a second part that is located below the first part inside the foundation and is fixed to the foundation.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a column-foundation joint structure between a wooden column and a foundation. [Background technology]

[0002] Various structures are known as column-foundation joint structures between wooden columns and foundations. For example, a column-foundation joint structure is known in which a wooden column and a foundation are joined by fastening an anchor member adhered to the foundation to the wooden column (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-165464 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional column-foundation joint structure, the anchor member is bonded to the foundation, so the tenacity against bending is insufficient. Thus, there is room for improvement in terms of ensuring the toughness performance of the joint in the conventional column-foundation joint structure.

[0005] This specification discloses a technique that can solve at least a part of the above-mentioned problems. [Means for solving the problem]

[0006] The technology disclosed in this specification can be realized, for example, in the following forms.

[0007] (1) A column-foundation joint structure disclosed in this specification includes a wooden column, a foundation disposed below the wooden column, and an anchor member that connects the wooden column to the foundation. The anchor member has a first portion that is disposed inside the foundation and in a non-bonded state with the foundation, and a second portion that is disposed inside the foundation below the first portion and fixed to the foundation.

[0008] According to this column-foundation joint structure, the anchor member is secured by the second part, while the first part, which is not attached to the foundation, extends in the vertical direction, providing strong bending deformation performance. As a result, the toughness performance of the joint between the wooden column and the foundation can be improved.

[0009] (2) In the above-mentioned column-foundation joint structure, the anchor member may further have a third portion disposed inside the wooden column and bonded to the wooden column. With this configuration, the anchor member and the wooden column can be firmly connected, and the joint strength of the joint between the wooden column and the foundation can be improved.

[0010] (3) In the above-mentioned column-foundation joint structure, the first portion of the anchor member may be configured by a rod-shaped member extending in the vertical direction, and the second portion of the anchor member may be configured by a member having a fixing plate fitted to the rod-shaped member. With this simple configuration, it is possible to improve the toughness performance of the joint between the wooden column and the foundation.

[0011] The technology disclosed in this specification can be realized in various forms, such as a column-foundation joint structure, a building having the column-foundation joint structure, a manufacturing method or construction method thereof, etc. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram showing the configuration of a building 100 according to an embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing a cross-sectional configuration of a joint 120 between a wooden column 10 and a foundation 90. [Diagram 3] FIG. 3 is an explanatory diagram showing a cross-sectional configuration of a joint 120 taken along the line III-III in FIG. 2; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A. Embodiment: Fig. 1 is an explanatory diagram showing the configuration of a building 100 in this embodiment. Fig. 1 shows the external configuration of a part of the building 100. In the following description, the Z-axis direction in the figure is also referred to as the "up-down direction" or "height direction," the positive Z-axis direction is also referred to as the "upward direction," and the negative Z-axis direction is also referred to as the "downward direction."

[0014] The building 100 of this embodiment is a stage-like building with a floor surface 101 constructed at an elevated position. The building 100 includes a foundation 90, wooden columns 10, wooden beams 20, joists 102, and floor materials 103.

[0015] The foundation 90 constitutes the lowest part of the building 100 and is a structure that transmits the load from above to the ground. The foundation 90 is made of, for example, reinforced concrete. The foundation 90 may be a spread foundation or a pile foundation.

[0016] The wooden column 10 is a vertical member for transmitting the load of a floor structure or the like to the foundation 90. The wooden column 10 is made of wood. In this embodiment, the wooden column 10 is made of symmetrical different grade laminated lumber (e.g., Scots pine E95-F270 or Japanese cypress E95-F270, etc.). The cross section of the wooden column 10 is, for example, approximately rectangular, 420 mm x 420 mm.

[0017] The wooden beam 20 is a horizontal member that supports the load of a floor structure and the like by connecting it to the wooden columns 10 and the like. The wooden beam 20 is made of wood. In this embodiment, the wooden beam 20 is made of symmetrical different grade laminated lumber (e.g., cedar E65-F225 or Scotch pine E105-F300, etc.). The cross section of the wooden beam 20 is, for example, approximately rectangular, 210 mm x 420 mm to 210 mm x 780 mm.

[0018] The flooring 103 is a plate-like member that constitutes a floor structure. The flooring 103 is made of wood. In this embodiment, the flooring 103 is made of Cross Laminated Timber (CLT) (for example, S90-3-3 cypress, S90-5-5 cypress, or Mx90-3-3 exterior: cypress, interior: cedar, etc.). The thickness of the flooring 103 is, for example, about 90 mm to 150 mm. A material other than wood (for example, a membrane material) may be used as at least a part of the flooring 103.

[0019] The joists 102 are horizontal members that support the floor materials 103 that make up the floor structure. The joists 102 are made of wood. In this embodiment, the joists 102 are made of symmetrical different grade laminated lumber (e.g., Scots pine E105-F300, etc.). The cross section of the joists 102 is, for example, approximately rectangular, measuring 120 mm×270 mm to 120 mm×330 mm. The arrangement pitch of the joists 102 is, for example, about 1800 mm.

[0020] Hereinafter, a description will be given of the column-foundation joint structure 120A of each joint 120 between the wooden column 10 and the foundation 90. Fig. 2 is an explanatory diagram showing the cross-sectional configuration of the joint 120 between the wooden column 10 and the foundation 90, and Fig. 3 is an explanatory diagram showing the cross-sectional configuration of the joint 120 at the position III-III in Fig. 2.

[0021] As shown in Figures 2 and 3, in this embodiment, at a joint 120 between the wooden column 10 and the foundation 90, a joint is adopted using anchor members 60 embedded across the wooden column 10 and the foundation 90. Twelve anchor members 60 are used at the joint 120, which are arranged approximately evenly along the outer shape of the cross section of the wooden column 10. The anchor members 60 are embedded in a post-cast concrete portion 92 of the foundation 90. A plate 18 is interposed between the lower surface of the wooden column 10 and the upper surface of the foundation 90. The thickness of the plate 18 is, for example, about 19 mm.

[0022] The anchor member 60 has a rod-shaped member 61 and a member 62 having an anchoring plate fitted near the lower end of the rod-shaped member 61. The member 62 having an anchoring plate is formed, for example, of a plate nut having a through hole. The member 62 having an anchoring plate is a member for performing an anchoring function inside the foundation 90, and is fixed to the foundation 90 by engaging with the foundation 90 in the up-down direction. The member 62 having an anchoring plate is an example of a second part.

[0023] The rod-shaped member 61 of the anchor member 60 is a member that extends in the vertical direction between the wooden column 10 and the foundation 90. The rod-shaped member 61 is made of, for example, a deformed steel bar (for example, D25).

[0024] The lower portion 64 of the rod-shaped member 61 is embedded inside the foundation 90. At least a portion of the lower portion 64 of the rod-shaped member 61 that is located above the member 62 having the fixing plate is subjected to an unbonding process and is in a non-bonded state with the foundation 90. In this embodiment, the entire portion of the lower portion 64 of the rod-shaped member 61 that is located above the member 62 having the fixing plate (unbonded portion R1 shown in FIG. 2 ) is in a non-bonded state with the foundation 90. The unbonded portion R1 is an example of a first portion.

[0025] An upper portion 63 of the rod-shaped member 61 is embedded inside the wooden column 10. The upper portion 63 of the rod-shaped member 61 is bonded to the wooden column 10. The upper portion 63 of the rod-shaped member 61 can be bonded to the wooden column 10 by, for example, a GIR (Glued-in Rod) method using epoxy resin injection. The upper portion 63 of the rod-shaped member 61 is an example of a third portion.

[0026] As described above, the column-foundation joint structure 120A of the joint 120 between the wooden column 10 and the foundation 90 in the building 100 of this embodiment includes the wooden column 10, the foundation 90 arranged below the wooden column 10, and the anchor member 60 that joins the wooden column 10 and the foundation 90. The anchor member 60 includes the unbonded portion R1 of the rod-shaped member 61 and a member 62 having a fixing plate. The unbonded portion R1 is arranged inside the foundation 90 and is not bonded to the foundation 90. The member 62 having a fixing plate is arranged below the unbonded portion R1 inside the foundation 90 and is fixed to the foundation 90. Therefore, according to the column-foundation joint structure 120A of this embodiment, the member 62 having the fixing plate ensures the fixation of the anchor member 60, while the unbonded portion R1 not bonded to the foundation 90 extends in the vertical direction, thereby exhibiting a tenacious bending deformation performance. As a result, the toughness performance of the joint 120 between the wooden column 10 and the foundation 90 can be improved.

[0027] Moreover, in the column-foundation joint structure 120A of this embodiment, the anchor member 60 further has an upper portion 63 of a rod-shaped member 61 that is disposed inside the wooden column 10 and bonded to the wooden column 10. Therefore, according to the column-foundation joint structure 120A of this embodiment, the anchor member 60 and the wooden column 10 can be firmly connected, and the joint strength of the joint 120 between the wooden column 10 and the foundation 90 can be improved.

[0028] B. Variations: The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the spirit of the invention. For example, the following modifications are also possible.

[0029] The configurations of the building 100 and the column-foundation joint structure 120A in the above embodiment are merely examples and can be modified in various ways. For example, in the above embodiment, the number and arrangement of the anchor members 60 used in the joint 120 between the wooden column 10 and the foundation 90 can be modified in various ways.

[0030] In the above embodiment, all of the lower portion 64 of the rod-shaped member 61 that is located above the member 62 having the fixing plate (unbonded portion R1 shown in Figure 2) is not bonded to the foundation 90, but only a portion of the lower portion 64 of the rod-shaped member 61 that is located above the member 62 having the fixing plate may be not bonded to the foundation 90.

[0031] In the above embodiment, the upper portion 63 of the rod-shaped member 61 of the anchor member 60 is embedded inside the wooden column 10 and bonded thereto, thereby connecting the anchor member 60 to the wooden column 10, but other means may be adopted as a means for connecting the anchor member 60 to the wooden column 10.

[0032] In the above embodiment, the member 62 having a fixing plate is used to fix the anchor member 60, but other members may be used. Also, in the above embodiment, the rod-shaped member 61 is used as a joining member between the wooden column 10 and the foundation 90 in the anchor member 60, but other members may be used. [Explanation of symbols]

[0033] 10: Wooden column 18: Plate 20: Wooden beam 60: Anchor member 61: Rod-shaped member 62: Member with fixing plate 63: Upper part 64: Lower part 90: Foundation 92: Concrete post-casting part 100: Building 101: Floor surface 102: Joist material 103: Floor material 120: Joint 120A: Column-foundation joint structure R1: Unbonded part

Claims

1. A column-foundation joint structure, Wooden pillars and A foundation disposed below the wooden pole; An anchor member that connects the wooden column and the foundation; Equipped with The anchor member is A first portion disposed inside the foundation and in a non-adherent state to the foundation; A second portion is disposed below the first portion inside the foundation and fixed to the foundation; A column-foundation joint structure having the above structure.

2. The column foundation joint structure according to claim 1, The anchor member further has a third portion that is disposed inside the wooden column and adhered to the wooden column, thereby forming a column-foundation joint structure.

3. The column foundation joint structure according to claim 1 or 2, The first portion of the anchor member is formed of a rod-shaped member extending in a vertical direction, A column-foundation joint structure, wherein the second part of the anchor member is constituted by a member having a fixing plate fitted into the rod-shaped member.

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