Binding method for anchor bolt and nut, binding structure for anchor bolt and nut, and displacement prevention washer between them and bed

Abstract

To provide a binding method for an anchor bolt and a nut, a binding structure for the anchor bolt and the nut, and a displacement prevention washer between them and a bed, which prevent the bed from sliding in a horizontal direction even if applying a horizontal load to the bed in encountering earthquake and typhoon or the like and can keep binding between the anchor bolt and the nut.SOLUTION: The present invention relates to binding structure for an anchor bolt 4 and a nut 5 that secures a predefined clearance C between the wall surface of a through hole 3 of a bed 2 and the anchor bolt 4 and comprises a washer 10 inserted into the anchor bolt 4 and contacting to a top surface 2a of the bed 2. The washer 10 has a flat part 12 where an insertion hole 11 for the anchor bolt 4 is formed, and a protruding part 13 that forms at an outer edge side of the flat part 12 and protruding downward from the flat part 12. The protruding part 13 sinks into the bed 2, and the flat part 12 contacts the top surface 2a of the bed 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for fastening an anchor bolt and a nut, a fastening structure of the anchor bolt and the nut, and a washer for preventing displacement from a base.

Background Art

[0002] Generally, the foundation and the base of a building are fastened by nuts that are screwed onto anchor bolts (see Patent Document 1). FIG. 4 is a partial cross-sectional explanatory view of a building showing a conventional example. As shown in FIG. 4, the anchor bolt 4 extends upward from the foundation 1 and is inserted into the through-hole 3 of the base 2, and has a male screw portion 4a that is screwed onto the nut 5 on the upper end side. Since there is a difference of more than 20 times in strength between the hardware and wood used in general houses and the like, a metal washer 110 is used for the purpose of suppressing excessive indentation into the base 2 made of wood. The washer 110 is formed flat, is inserted below the nut 5 in the anchor bolt 4, and contacts the upper surface 2a of the base 2. When forming the through-hole 3 of the anchor bolt 4 in the base 2, in order to reduce rework caused by an error in the drilling position and to release the seismic force applied to the base 2 during an earthquake, the diameter of the through-hole 3 is set so as to secure a clearance C between the anchor bolt 4 and the wall surface of the through-hole 3.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when encountering earthquakes, typhoons, etc., and a horizontal load is applied to the base 2 due to shaking, wind, etc., as shown in Fig. 5, there was a problem that the base 2 and the washer 110 slipped and the base 2 shifted horizontally. When a horizontal shift occurs in the base 2, there is a risk that the fastening between the anchor bolt 4 and the nut 5 cannot be maintained, and there is a risk that the building may be damaged.

[0005] An object of the present invention is to provide a method for fastening an anchor bolt and a nut, a fastening structure of an anchor bolt and a nut, and a washer for preventing displacement from the base, which can maintain the fastening between the anchor bolt and the nut without the base shifting horizontally even when a horizontal load is applied to the base when encountering earthquakes, typhoons, etc.

Means for Solving the Problems

[0006] To achieve the above object, in the present invention, a foundation, an anchor bolt extending upward from the foundation, a base made of wood disposed above the foundation, a through hole formed in the base through which the anchor bolt is inserted, a washer inserted through the anchor bolt and contacting the upper surface of the base, and a nut screwed to the upper end side of the anchor bolt, and a method for fastening an anchor bolt and a nut in which a predetermined clearance is secured between the wall surface of the through hole and the anchor bolt, the washer is provided with a flat portion in which an insertion hole for the anchor bolt is formed, and a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion, There is provided a method for fastening an anchor bolt and a nut in which the washer inserted through the anchor bolt is moved downward by tightening the nut screwed to the anchor bolt in a state where the washer is placed on the upper surface of the base, and at least a part of the protruding portion is embedded in the base.

[0007] In the above method for fastening an anchor bolt and a nut, the washer has a circular shape in plan view, The protruding portion is preferably formed to incline downward from the radially outer edge of the flat portion toward the radially outer side.

[0008] In the method of tightening the anchor bolt and the nut described above, The flat portion has a circular shape in plan view, The protruding portion is preferably formed by bending the outer edge side of the washer.

[0009] Also, in the present invention, A foundation, An anchor bolt extending upward from the foundation, A base made of wood disposed above the foundation, A through-hole formed in the base through which the anchor bolt is inserted, A washer inserted through the anchor bolt and contacting the upper surface of the base, A nut screwed onto the upper end side of the anchor bolt, are provided, An anchor bolt and nut fastening structure in which a predetermined clearance is secured between the wall surface of the through-hole and the anchor bolt, The washer has a flat portion in which an insertion hole for the anchor bolt is formed, and a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion, The protruding portion sinks into the base, An anchor bolt and nut fastening structure is provided in which the flat portion contacts the upper surface of the base.

[0010] In the above-described anchor bolt and nut fastening structure, The washer has a circular shape in plan view, The protruding portion is preferably formed to incline downward from the radially outer edge of the flat portion toward the radially outer side.

[0011] In the above-described anchor bolt and nut fastening structure, The flat portion has a circular shape in plan view, The protruding portion is preferably formed by bending the outer edge side of the washer.

[0012] Furthermore, in the present invention, a base, an anchor bolt extending upward from the base, a base made of wood disposed above the base, a through hole formed in the base through which the anchor bolt is inserted, a washer inserted through the anchor bolt and contacting the upper surface of the base, and a nut screwed onto the upper end side of the anchor bolt, and the washer used in a fastening structure of the anchor bolt and the nut in which a predetermined clearance is secured between the wall surface of the through hole and the anchor bolt, a flat portion formed with an insertion hole for the anchor bolt, a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion, When the nut screwed onto the anchor bolt is tightened and moved downward while being inserted through the anchor bolt and placed on the upper surface of the base, at least a part of the protruding portion is configured to sink into the base, and a washer for preventing displacement from the base is provided.

[0013] In the washer for preventing displacement from the above base, it has a circular shape in plan view, the protruding portion is preferably formed to incline downward from the radially outer edge of the flat portion toward the radially outer side.

[0014] In the washer for preventing displacement from the above base, the flat portion has a circular shape in plan view, the protruding portion is preferably formed by bending the outer edge side of the washer.

Advantages of the Invention

[0015] According to the present invention, even when a horizontal load is applied to the base due to an earthquake, a typhoon, or the like, the base does not shift horizontally, and the fastening between the anchor bolt and the nut can be maintained.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0017] FIGS. 1 to 3 are an embodiment of the present invention. FIG. 1 is a partial cross-sectional explanatory view of a building, FIG. 2 is a perspective view of the anti-shift washer, and FIG. 3 is a partial cross-sectional explanatory view of a building in a state where the anti-shift washer is placed on the upper surface of the base before the nut is screwed onto the anchor bolt.

[0018] As shown in FIG. 1, the fastening structure of the anchor bolt and the nut of the present embodiment includes a foundation 1 made of concrete, a base 2 made of wood disposed above the foundation 1, a through hole 3 formed in the base and extending vertically, an anchor bolt 4 extending upward from the foundation 1 and passing through the through hole 3, and a nut 5 screwed to the upper end side of the anchor bolt 4. A predetermined clearance C is ensured between the wall surface 3a of the through hole 3 and the anchor bolt 4. The anchor bolt 4 has a male screw portion 4a that can be screwed with the nut 5 on the upper end side. The diameter dimension of the anchor bolt 4 is arbitrary, for example, 12 mm. Also, the diameter dimension of the through hole 3 is arbitrary, but for example, when the diameter dimension of the anchor bolt 4 is 12 mm, it can be 24 mm. Further, the fastening structure of the anchor bolt and the nut of the present embodiment has an anti-shift washer 10 inserted through the anchor bolt 4 and contacting the upper surface 2a of the base 2.

[0019] As shown in Fig. 2, the anti-displacement washer 10 for preventing displacement from the base is made of metal, and has a flat portion 12 in which an insertion hole 11 for the anchor bolt 4 is formed, and a protruding portion 13 formed on the outer edge side of the flat portion 12 and protruding downward from the flat portion 12. The diameter dimension of the insertion hole 11 is arbitrary. For example, when the diameter dimension of the anchor bolt 4 is 12 mm, it can be set to 13 mm. In the present embodiment, the anti-displacement washer 10 has a circular shape in plan view, and the protruding portion 13 is formed by bending the outer edge side of the anti-displacement washer 10 so as to incline downward toward the radially outer side. The diameter dimension of the radially inner end of the protruding portion 13 of the anti-displacement washer 10 is formed larger than the diameter dimension of the through hole 3 after the diameter is expanded. The outer diameter dimension of the washer 10 is arbitrary, and can be, for example, 45 mm. As shown in Fig. 1, in the present embodiment, the upper surface 2a of the base 2 and the upper surface 12a of the flat portion 12 of the anti-displacement washer 10 are flush. It should be noted that the upper surfaces of the base 2 and the anti-displacement washer 10 do not have to be flush.

[0020] Hereinafter, with reference to Fig. 3, the tightening method of the anchor bolt 4 and the nut 5 will be described. The tightening method of the anchor bolt 4 and the nut 5 of the present embodiment is applicable to both new construction work and renovation work of a building. In the case of renovation work, the existing nut 5 in the tightened state is once removed from the anchor bolt 4, and after performing predetermined work related to renovation such as repair, the anchor bolt 4 and the nut 5 are tightened again. When tightening again, the existing nut 5 may be reused, or a newly installed nut 5 may be used.

[0021] As shown in Fig. 3, the base 2 is set on the foundation 1 so that the anchor bolt 4 passes through the through hole 3, and the anti-displacement washer 10 is inserted through the anchor bolt 4 and brought into contact with the upper surface 2a of the base 2. In this state, the nut 5 that is screwed with the anchor bolt 4 is tightened to move it downward, and the protruding portion 13 is made to sink into the base 2. Since the anti-displacement washer 10 made of metal has high strength against the base 2 made of wood, the protruding portion 13 can be smoothly sunk into the base 2. When the flat portion 12 comes into contact with the upper surface 2a of the base 2, the downward movement of the anti-displacement washer 10 stops, and the anchor bolt 4 and the nut 5 are tightened.

[0022] According to the fastening structure of the anchor bolt 4 and the nut 5 of the present embodiment, since the top of the anchor bolt 4 is restrained on the base 2 side by the anti-shift washer 10, the horizontal movement with respect to the base 2 is blocked. This effect can be obtained by at least a part of the protruding portion 13 of the anti-shift washer 10 being recessed into the base 2. Thereby, even if an earthquake, a typhoon, etc. are encountered and a horizontal force is applied to the base 2 by shaking, wind, etc., the base 2 will not shift horizontally with respect to the anchor bolt 4, the anti-shift washer 10, etc., and the fastening state of the anchor bolt 4 and the nut 5 can be maintained.

[0023] In addition, in the above embodiment, although the protruding portion 13 of the anti-shift washer 10 is shown as being inclined downward toward the radially outer side, the shape of the protruding portion 13 can be arbitrarily changed. Also, although the anti-shift washer 10 is shown as being circular in plan view, the plan view shape of the anti-shift washer 10 is not limited to this.

[0024] As described above, the embodiments of the present invention have been described. However, the above-described embodiments do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are essential means for solving the problems of the invention.

Explanation of reference numerals

[0025] 1 Foundation 2 Base 2a Upper surface 3 Through hole 4 Anchor bolt 4a Male thread portion 5 Nut 10 Anti-shift washer with the base 11 Insertion hole 12 Body portion 13 Protruding portion C Clearance

Claims

1. A method for fastening an anchor bolt and a nut, comprising a base, an anchor bolt extending upward from the base, a base made of wood disposed above the base, a through hole formed in the base through which the anchor bolt is inserted, a washer inserted through the anchor bolt and contacting the upper surface of the base, and a nut screwed onto the upper end side of the anchor bolt, wherein a predetermined clearance is secured between the wall surface of the through hole and the anchor bolt, the washer having a flat portion in which an insertion hole for the anchor bolt is formed and a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion, and the method for fastening the anchor bolt and the nut is to move the washer inserted through the anchor bolt downward by tightening the nut screwed onto the anchor bolt with the washer placed on the upper surface of the base, so that at least a part of the protruding portion is embedded in the base.

2. The washer has a circular shape in plan view, and the protruding portion is formed to incline downward from the radially outer edge of the flat portion toward the radially outer side, according to the method for fastening an anchor bolt and a nut according to claim 1.

3. The flat portion has a circular shape in plan view, and the protruding portion is formed by bending the outer edge side of the washer, according to the method for fastening an anchor bolt and a nut according to claim 2.

4. A fastening structure for an anchor bolt and a nut, comprising a base, an anchor bolt extending upward from the base, a base made of wood disposed above the base, a through hole formed in the base through which the anchor bolt is inserted, a washer inserted through the anchor bolt and contacting the upper surface of the base, and a nut screwed onto the upper end side of the anchor bolt, wherein a predetermined clearance is secured between the wall surface of the through hole and the anchor bolt, the washer having a flat portion in which an insertion hole for the anchor bolt is formed and a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion, the protruding portion being embedded in the base, and the flat portion contacting the upper surface of the base, of the fastening structure for an anchor bolt and a nut.

5. The washer has a circular shape in plan view, and the protruding portion is formed to incline downward from the radially outer edge of the flat portion toward the radially outer side, according to the fastening structure for an anchor bolt and a nut according to claim 4.

6. The flat portion has a circular shape in plan view, The fastening method of the anchor bolt and nut according to claim 5, wherein the protruding portion is formed by bending the outer edge side of the washer.

7. A base, an anchor bolt extending upward from the base, a base made of wood disposed above the base, a through hole formed in the base through which the anchor bolt is inserted, a washer inserted through the anchor bolt and contacting the upper surface of the base, and a nut screwed to the upper end side of the anchor bolt, and the washer used in the fastening structure of the anchor bolt and the nut in which a predetermined clearance is secured between the wall surface of the through hole and the anchor bolt, a flat portion formed with an insertion hole for the anchor bolt, and a protruding portion formed on the outer edge side of the flat portion and protruding downward from the flat portion. When the nut screwed to the anchor bolt is tightened and moved downward in a state where the washer is inserted through the anchor bolt and placed on the upper surface of the base, at least a part of the protruding portion is configured to sink into the base, and the washer for preventing displacement from the base.

8. It has a circular shape in plan view, The washer for preventing displacement from the base according to claim 7, wherein the protruding portion is formed to incline downward from the radially outer edge of the flat portion toward the radially outer side.

9. The flat portion has a circular shape in plan view, The washer for preventing displacement from the base according to claim 8, wherein the protruding portion is formed by bending the outer edge side of the washer.

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