JPH0657828A - Joint metal piece for high strength bolt joining part - Google Patents

Abstract

PURPOSE:To provide a required anti-slip resistance steadily and eliminate processing of a parent material at a steel processing factory for generating friction on the joint surfaces. CONSTITUTION:Bolt holes 7 are provided in a joint surface to be joined with a parent material 6 by the use of high strength bolts 8, and a projection 4 is formed in a single piece structure in that part of each bolt hole where the fastening force affects. A protrusion 5 in the form of a cutting edge is formed at each projection 4 and allowed to pierce the scale or the like with driving of high strength bolt 8 and bite into the parent material 6 certainly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint metal fitting such as an attachment plate or a T-shaped joint used for a high-strength (high-tensile) bolt joint portion of a steel structure material (base material) such as a pillar or a beam.

[0002]

2. Description of the Related Art High-strength bolt joining is a method of joining steel structural members using high-strength bolts, which is a method of introducing axial force into the bolts to strongly join the joining members together, and friction joining, It is roughly divided into three types of joining methods: tensile joining and bearing joining. Friction welding is a so-called shear-type joining method that tries to transmit stress in the direction perpendicular to the bolt axis by frictional resistance acting between joining members, and tensile joining tries to transmit stress in the bolt axis direction. This is a so-called tensile type joining method.Furthermore, pressure bearing welding is similar to friction welding, in which shearing deformation occurs slightly when slip occurs in the initial stage of force application, and pressure bearing welding similar to rivet welding. It is a joining method that tries to shift to.

Conventionally, in a high-strength bolted joint, particularly a frictional joint type high-strength bolted joint, in order to obtain friction at the joint surface between the base metal and the joint fitting, the joint surface between the base metal and the joint fitting is sufficient. By generating red rust or roughening by shot blasting, the specified slip coefficient (μ
= 0.45 or more) is obtained.

The former method of generating red rust is a method of removing black skin on the surface of a steel sheet by a grinder sanding machine or the like and leaving the polished surface in the air for about 2 to 3 weeks to generate red rust. Shot blasting is a method of forming the surface of a steel sheet roughly by shot blasting into a roughened state.

[0005]

However, the above-mentioned conventional high-strength bolt joint should not slip (μ = 1.0).
Although a desired slip coefficient is obtained due to the occurrence of rust, etc., the slip coefficient of the joint surface varies, and it is difficult to manage a sufficient resistance force (slip resistance) against friction bolt joining. In addition, both the method of generating red rust to obtain friction and the method of performing shot blasting are performed in the steel frame processing plant, but a crane, a grinder sander, and a shot blasting machine for moving the base material are required. At the same time, great effort is required. In particular, the occurrence of red rust has become a bottleneck in steel frame processing, since it requires a time and a place to leave it for a certain amount of rust to occur.

Therefore, according to the present invention, a blade-shaped projection is integrally formed on the joint surface around the bolt hole of the joint fitting, and the blade-shaped projection is formed on the base material by tightening the base material and the joint fitting with a high-strength bolt. High-strength bolts that can consistently obtain the required slip strength by securely biting into the joint surface and that do not require a rusting or other machining process in a steel frame processing factory to obtain friction on the joint surface. The purpose is to provide a joint fitting for a joint.

[0007]

In order to solve the above-mentioned problems, a joint metal fitting for a high-strength bolt joining portion of the present invention has a base material and a high-strength bolt around a bolt hole of a joining surface to be joined, The convex portion is integrally formed over the range affected by the tightening force of one high-strength bolt, and the blade-like protrusion is formed on the convex portion.

[0008]

In the above means, the blade-like projection penetrates the black skin, the rust preventive paint and the galvanizing and is surely bitten into the base material by tightening the base material and the joint fitting with the high-strength bolt.

It is preferable that the size of the convex portion is slightly smaller than the range in which the tightening force of one high-strength bolt affects, and by doing so, the cutting of the blade-shaped projection is completely completed. can do. The shape of the convex portion is preferably circular in terms of the range affected by the tightening force of the high-strength bolt, but may be oval, square, or any other shape. The blade-shaped protrusion formed on the convex portion may have a concentric shape centered on the bolt hole, a spiral shape, or a radial shape, or may have a plurality of linear shapes parallel to one direction. In the case of the former blade-shaped protrusion centering on the bolt hole, it is possible to obtain sliding resistance in all directions, and in the latter case of the blade-shaped protrusion forming a straight line parallel to one direction, the extension of the protrusion. It is possible to obtain the slip resistance in the direction perpendicular to the direction. The convex portion is 3 to 10 mm
Is preferably about 5 to 6 mm, and the height of the blade-like protrusions is preferably about 1 to 3 mm. Further, it is desirable that the interval between the blade-shaped projections be a pitch that does not cause damage such as peeling in order to utilize the strength of the black skin of the base material. The base material may be the black skin as it is, or the black skin may be coated with an anticorrosive paint or may be galvanized.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an attachment plate that is a joint metal fitting for a high-strength bolt joint according to the first embodiment of the present invention. This plate 1
Is a rectangular flat plate made of SS41 or other material equivalent to or higher than SS41, and as described later, a steel frame structural material (base material).
Plural bolt holes 2 through which high-strength bolts for joining with are inserted at appropriate pitches. Then, 1 is provided around each bolt hole 2 on the joint surface 3 to be joined to the base material.
The size of the range affected by the tightening force of the high-strength bolt of the book, for example, the high-strength bolt diameter 16 to 30 mm, the plate thickness of the attached plate 12 mm
In this case, a circular convex portion 4 having an outer diameter of about 40 to 90 mm is integrally formed by casting or the like, and a concentric circular blade-shaped protrusion 5 is cast or machined on the upper surface of the convex portion 4. It is formed by processing. The blade-shaped projection 5 has an isosceles triangular cross section (vertical angle is 70 to 90 °),
It has a pitch that does not damage the black skin of the base material, and has a height sufficient to penetrate the black skin and bite into the base material, for example, 1 to
It has a height of 3 mm. As shown in FIG. 2, FIG. 3, and FIG. 4, the attachment plate 1 having the above-described configuration is made of SS41 and other materials equal to or higher than SS41, and between the end portions of the steel structure members (base materials) 6 that are linearly butted against each other. Placed on both sides across
The high-strength bolt 8 is inserted through the bolt hole 2 and the bolt hole 7 of the steel structure member 6 to join the steel structure member 6 by a friction welding method.
By tightening, the blade-shaped protrusions 5 penetrate the black skin or the like and surely bite into the steel structure member 6.

In the high-strength bolt joint using the attachment plate 1 having the above-mentioned structure, the concentric blade-shaped projections 5 penetrate the joint surface of the steel structure member 6 through the black skin or the like to surely penetrate the joint surface. Since the sliding resistance in the direction can be obtained, the rigidity of the black leather and the tightening force of the high-strength bolt 8 can be efficiently used, and there is no variation in the slip coefficient as in the conventional case, and the required constant value can be obtained constantly. It is possible to obtain slip resistance, and it is not necessary to perform processing such as rust generation in a steel frame processing factory to obtain friction, and it is possible to easily and reliably perform on-site joining by high-strength bolt joining of a friction joining method. Here, the result of the experiment,
When the height of the blade-shaped protrusions 5 is 2 to 3 mm and the pitch is 4 to 6 mm, the slip coefficient in one direction is μ = 0.6 to 0.65.
Met.

FIG. 5 and FIG. 6 are perspective views of a T-shaped joint and a joint fitting which are joint fittings for a high-strength bolt joint according to the second and third embodiments of the present invention. The T-shaped joint 9 and the connecting fitting 10 are formed in a T-shape and a U-shape, respectively, using SS41 and other materials equal to or higher than SS41, and as described later, a cross-shaped or H-shaped steel frame structural material (base material). A plurality of bolt holes 11, 1 through which high-strength bolts for joining with
2 are provided at required positions at appropriate pitches.
Then, the respective joint surfaces 13 and 14 to be joined to the base material
Around each of the bolt holes 11 and 12 in the above, circular convex portions 15 and 16 having a size within a range in which the tightening force of one high-strength bolt is affected are integrally formed by casting or the like. Plural parallel linear blade-shaped projections 17 and 18 are formed on the upper surfaces of the convex portions 15 and 16 by casting or machining. These blade-shaped projections 17,1
No. 8 has an isosceles triangle in cross section (vertical angle 70-
90 °) and has a pitch that does not damage the black skin of the base material, and has a height sufficient to penetrate the black skin and bite into the base material. The blade-shaped protrusions 17 and 18 extend in a direction orthogonal to the load transmission direction.

The T-shaped joint 9 and the connecting fitting 10 having the above construction
As shown in FIG. 7 and FIG. 8, as a beam member or the like in the T-shaped portion 20 of the cross-shaped steel frame structure member (base material) 19 which is made of SS41 or other material equivalent to or higher than this and is used as a pillar member or the like. The H-shaped steel structure member 21 to be used is arranged so as to sandwich the T-shaped portion 20 between the outside (right side in FIG. 8) and the inside (left side in FIG. 8) to which the bolt holes 11, High-strength bolt 2 with 12 and 22 inserted
The steel-framed structural members 19 and 21 are joined together by a tension-joining method by being tightened by 3. By the tightening of the high-strength bolts 23, the blade-shaped projections 17 and 18 penetrate the black skin or the like to penetrate the steel-framed structure. Make sure to cut into the materials 19 and 21. According to the T-shaped joint 9 and the connecting fitting having the above-described configuration, when a tensile load acts on the T-shaped portion 20 of the steel frame structure material 19 by the steel frame structure material 21 as shown by an arrow 24 in FIG. The blade-shaped projection 1 of the connecting fitting 10 in the portion 20
8, the same operational effect as that of FIG. 2 can be obtained except that the slip proof strength in the direction of the arrow 25 is generated.

In the embodiment described above, the attachment plate 1, the T-shaped joint 9 having the blade-shaped projections 5, 17 and 18 and the connecting metal fitting 10 are used as the high-strength bolt joints of the friction joining method and the tensile joining method. Although the case of application has been described, the present invention is not limited to this, and can be applied to a high-strength bolt connection portion of a bearing connection method.
Further, the blade-shaped projection is not limited to the concentric circle shape and the linear shape in one direction, but may be a radial shape, a spiral shape, or the like.

[0015]

As described above, according to the joint metal fitting for a high-strength bolt joint of the present invention, the blade-shaped protrusions are black skin or rust preventive paint due to the tightening of the base metal and the joint metal fitting with the high-strength bolt. Alternatively, it can penetrate the galvanization and penetrate into the base material securely, so that the tightening force of high-strength bolts can be used efficiently, and there is no variation in the slip coefficient as in the past, and there is a constant It is possible to obtain the required slip resistance higher than the legal requirement, and it is not necessary to perform processing such as rust generation at the steel frame processing factory to obtain friction, and it is possible to easily and reliably perform on-site joining by high strength bolt joining. .

[Brief description of drawings]

FIG. 1 is a perspective view of a high strength bolt joint fitting according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a high-strength bolt joint using the joint fitting shown in FIG.

3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is an enlarged plan view of a main part of FIG.

FIG. 5 is a perspective view of a joint metal fitting for a high-strength bolt joint according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a joint metal fitting for a high-strength bolt joint according to a third embodiment of the present invention.

7 is a perspective view of a high-strength bolt joint using the joint fitting shown in FIGS. 5 and 6. FIG.

8 is an enlarged cross-sectional view of the main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Addition plate 3 Joining surface 4 Convex part 5 Blade-shaped projection 6 Steel structure material (base material) 7 Bolt hole 8 High-strength bolt 9 T-joint 10 Connecting fitting 11 Bolt hole 12 Bolt hole 13 Joining surface 14 Joining surface 15 Convex Part 16 Convex part 17 Blade-shaped projection 18 Blade-shaped projection 19 Steel structure material (base material) 21 Steel structure material (base material) 23 High-strength bolt

Claims (1)

[Claims] 1. A convex portion is integrally formed around a bolt hole in a joint surface where a base material and a high-strength bolt are joined together, over a range affected by the tightening force of one high-strength bolt. A joint metal fitting for a high-strength bolt joint, characterized in that a blade-like protrusion is formed on the convex portion.