JP2002155910A - High strength bolt friction grip structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the diameter of a high strength bolt by increasing the frictional force in a high strength bolt frictional grip structure that a first joining member is pinched by second joining members from both sides and they are joined with each other by high strength bolts. SOLUTION: The first joining member 10 is formed with through holes 11, and a joining surface thereof is formed with a frictional surface 12. Second joining members 20 and 30 are formed with through holes 21 and 31 at positions corresponding to the through holes 11, and joining surfaces thereof to be joined with the first joining member 10 are formed with frictional surfaces 22 and 32 having a different hardness or a different roughness from the frictional surface 12. The high strength bolt 40 is passed through each through holes 11, 21 and 31, and a nut 50 is screwed for junction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength bolt friction joining structure, and more particularly to a high-strength bolt friction joining structure formed by joining three members such as a steel plate in a building or various structures with a high-strength bolt and a nut. Things.

[0002]

2. Description of the Related Art In building structures and various structures, a so-called high-strength bolt friction joining structure in which a plurality of steel plates are joined with high-strength bolts and nuts is often used.

FIG. 2 shows a high-strength bolt friction joining structure B in which a joining member made of three steel plates is joined with a high-strength bolt and a nut. A first joining member 110 and a second joining member 12 are shown.
0, 130 and through holes 111, 121, 13 respectively.
1 is formed, and the first joint member 110 is separated from the through holes 111, 121, 13 by the second joint members 120, 130 from both sides.
1 are aligned so that the through holes 111 and 12
The high-strength bolts 140, 140 are inserted through the first and the first 131, and the nuts 150, 150 are screwed and joined.

Although not shown, a washer is interposed between the second joint member 130 and the nut 150 in the high-strength bolt friction joint structure B of FIG.

[0005]

In the above-mentioned conventional high-strength bolt friction joining structure B, the first and second joining members 11 are used.
In the conventional friction surface treatments (shot blast, grit blast, etc.) of 0, 120, and 130, the design value of the friction coefficient is set to 0.45, and a large number of tensile stresses or compressive stresses are transmitted. Bolts are required.
Therefore, the joining member at the joint where a large tensile stress or compressive stress acts becomes large, and it has been difficult to improve the construction performance.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a high-strength bolt friction joining structure in which a first joining member is sandwiched from both sides by a second joining member and joined by high-strength bolts. A high-strength bolt friction joining structure that secures a large friction coefficient by changing the hardness or roughness of the friction surface between the first joining member and the second joining member.

According to the present invention, the friction surface of the first joint member and the friction surface of the second joint member are formed by shot blasting. It is characterized in that the hardness or roughness amount is varied by adjusting the standing time.

According to the present invention, as described above, the coefficient of friction on the friction surface between the first joint member and the second joint member can be increased.

According to the present invention, a large coefficient of friction can be expected in the design of a joint where a large tensile stress or a compressive stress is acting. Therefore, it is possible to reduce the number of bolts and to reduce the size of the joint. It can be easily carried into the site and the workability of the site work is improved.

[0010] Furthermore, the hardness or roughness formed on the friction surfaces of the first and second joining members is formed by shot blasting, and the number of shot blasts is changed so that different hardness or roughness can be easily obtained. Can be formed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a high-strength bolt friction joining structure A in which a joining member made of three steel plates according to the present invention is joined with a high-strength bolt and a nut. In the figure, reference numeral 10 denotes a first joining member having a plurality of through holes 11, 11;
Friction surfaces 1 on the joint surfaces (both surfaces) with the joining members 20 and 30
It has 2,12. 20 and 30 are the first joining members 1
The first joining member 10 has through holes 21 and 31 at positions corresponding to the through holes 11 of the first joining member 10, respectively. These second joining members 20, 3
Friction surfaces 22 and 32 are formed on the joint surface of the first joint member 10 with the first joint member 10, respectively. The high-strength bolts 4 are provided in the through holes 11, 21 and 31 that match as described above.
The first and second joint members 10, 20, 30 are joined by inserting the nuts 50, 50 into portions protruding from the lower surface of the second joint member 30.

Although not shown, a washer is interposed between the second joining member 30 and the nut 50.

According to the above configuration, the first joining member 10
And the friction surfaces 12, 22, 32 formed on the joint surfaces of the second joint members 20, 30 make the first joint member 10
And the second joint members 20 and 30 increase in frictional force,
Since the tightening force is constant, it can withstand a large tensile force.

The friction surfaces 12, 22, and 32 of the first and second joining members 10 and 20, 30 can be formed by, for example, shot blasting (shot peening). In this case, for example, the first joining member 1
0 for one shot blast, and two shot blasts for the second joint members 20 and 30 while being left for a predetermined time, so that the frictional surface of the first joint member 10 is increased. 12 hardness or roughness and the second
The hardness or roughness of the friction surfaces 22, 32 of the joining members 20, 30 can easily be made different from each other.

Contrary to the above, two shot blasts are performed on the first bonding member 1 while being left for a predetermined time, and one shot is performed on the second bonding members 20 and 30. The first joining member 1 can also be blasted.
The hardness or roughness of the friction surface 12 at 0 and the hardness or roughness of the friction surfaces 22 and 32 of the second joint members 20 and 30 can be easily made different.

Although the above embodiment has been described with respect to a specific configuration, the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, as a method of forming the friction surface, shot blasting is simple and excellent, but sand blasting, grit blasting, liquid honing, and the like may be employed.

Further, the first and second joining members are not limited to so-called flat plate members which are flat over the entire surface, but are bent at 90 degrees or other angles, curved surfaces, etc., except for the joining portions. Any one such as the one which has been processed may be used.

[0019]

According to the present invention, the friction surfaces are formed on the joining surfaces of the first and second joining members as described above.
Since the frictional force of the second joining member can be increased, the diameter of the high-strength bolt can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part in a high-strength bolt friction joining structure of the present invention.

FIG. 2 is a cross-sectional view of a main part of a conventional high-strength bolt friction joining structure.

[Explanation of symbols]

 A High-strength bolt friction joining structure 10 First joining member 20, 30 Second joining member 11, 21, 31, Through hole 12, 22, 32 Friction surface 40 Bolt 50 Nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Tanaka 2-26 Tsumon Nishiguchicho, Nishinomiya-shi, Hyogo Araigumi Co., Ltd. (72) Inventor Takeyuki Ochi 947-6 Yuge, Tatsutacho, Kumamoto-shi F-term (reference) 2E125 AA71 AF03 AG11 BA24 BB08 BB30 BC05 BC08 BD01 BE02 BF03 CA06 DA01 EA01 EB01 3J001 FA02 GA02 GB01 HA02 JA10 KA06 KA21 KA26 KB04

Claims (2)

[Claims] In order to increase the frictional force of a frictional surface of a joint of a high-strength bolt friction joining structure in which a first joining member is sandwiched from both sides by a second joining member and joined by high-strength bolts, A high-strength bolt friction joining structure characterized by varying hardness or roughness. 2. A friction surface of the first joining member,
2. The high friction surface according to claim 1, wherein the friction surface of the second joining member is formed by shot blasting, and the hardness or the roughness of the frictional surface is changed by changing the number of shot blasts and a leaving time. 3. Force bolt friction joining structure.