JPH05331918A - High strength bolted part structure - Google Patents

Abstract

PURPOSE:To obtain a specified bearing strength on a regular basis and eliminate the need for machining a basic material at a structural steel fabrication shop which forces to increase a friction coefficient on a joint area. CONSTITUTION:A joint auxiliary member 9 which forms a blade-shaped projected part 8 on one side of a plate-like body 7 which has at least both strength and hardness identical to a basic material 1 and a joint fitting 2 and a bolt hole 6 in the central part, and what is more, a clamping force as large as that of one strength bolt in scope, is fitted into a counter boring recessed part 11 formed around a bolt hole 4 on a joint area of a joint fitting to be connected to the basic material in such a fashion that a projected part on one side may be projected from the joint area. Clamping the basic material and the joint fitting by the high strength bolt forces the projected part to bite into the basic material definitely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a joint portion between a steel frame structure material (base material) joined with a high-strength (high-tension) bolt and a joint metal fitting such as an attachment plate.

[0002]

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

Conventionally, in a high-strength bolt joint structure, in particular, in a friction joint type high-strength bolt joint structure, in order to increase the friction coefficient of the joint surface between the base material and the joint fitting, the joint between the base material and the joint fitting is performed. By generating sufficient red rust on the surface or applying shot blasting to roughen the surface,
It has been performed to obtain a predetermined slip coefficient (μ = 0.45 or more).

The former method of generating red rust is a method of removing the black skin on the surface of the steel sheet by a grinder polishing machine or the like, and leaving the polished surface in the air for about 2 to 3 weeks to generate red rust. The shot blast treatment is a method of forming the surface of a steel sheet into a rough and appropriate uneven state by shot blasting.

[0005]

However, the conventional high-strength bolt joint structure described above does not slip (μ = 1.
Although it is unavoidable to obtain a predetermined slip coefficient, although 0) is desirable, the slip coefficient of the joint surface varies, and it is difficult to manage a sufficient resistance force (slip resistance) against stress. In addition, both the method of generating red rust to increase the friction coefficient and the method of performing shot blasting are performed in the steel processing factory, but a crane, grinder sander, and shot blasting machine to move the base material are required. It also requires a great deal of work. In particular, the occurrence of red rust has become a bottleneck in the processing of steel frames because 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 joining assisting member having a blade-like projection is fitted around the bolt hole of the joint fitting in the counterbore recess for each high-strength bolt, or joined to the periphery of the bolt hole. By securely tightening the base material and the joint metal fittings with force bolts so that the blade-like protrusions bite into the joint surface of the base material, the required sliding resistance can be constantly obtained and the friction coefficient of the joint surface. It is an object of the present invention to provide a high-strength bolted joint structure that can eliminate the need for a step of processing a base material in a steel frame processing factory to increase the workability.

[0007]

In order to solve the above-mentioned problems, the first high-strength bolt joint structure of the present invention has strength and hardness equal to or higher than those of the base material and the joint fitting, and has a bolt at the center. A joining assisting member having a hole and a blade-like projection formed on at least one surface of a plate-like body having a size within a range affected by the tightening force of one high-strength bolt is used as a base material. Fitted in the counterbore recess formed around the bolt hole in the joint surface of the joint fitting to be joined so that the projection on one surface protrudes from the joint surface, and then the high-strength bolt is inserted through each of the bolt holes. This is a structure in which the material and the joint fitting are tightened and joined. Further, the second high-strength bolt joint structure has strength and hardness equal to or higher than those of the base metal and the fitting, has a bolt hole in the center, and has a tightening force of one high-strength bolt. A joining auxiliary member having a blade-like projection formed on one surface of a plate-like body having a size of the range of influence is provided around the bolt hole on the joining surface of the joint metal fitting to be joined to the base metal, and the other surface. The base material and the joint fitting are fastened and joined by high-strength bolts inserted through the bolt holes.

[0008]

In each of the above means, the joining assisting member is used for each high-strength bolt, and the projection is fitted into the counterbore recess around the bolt hole so that the projection projects from the joining surface of the fitting. Alternatively, it is joined to the joint surface around the bolt hole, and the blade-shaped projection is surely bited into the joint surface of the base material by tightening the base material and the joint fitting with the high-strength bolt.

The shape of the joining assisting member is preferably circular in terms of processing, but may be oval, rectangular or any other shape. The blade-like protrusions on at least one surface of the joining assisting member may have a concentric circle shape centered on the bolt hole, a spiral shape, or a radial shape, or may have a plurality of straight lines parallel to one direction. In the case of the blade-shaped protrusion centering on the former bolt hole,
It is possible to obtain slip resistance in all directions, and in the case of the latter blade-shaped projection that is linear and parallel to one direction, it is possible to obtain slip resistance in a direction perpendicular to the extending direction of the projection. On the other hand, the protrusion on the other surface that faces the bottom surface of the counterbore recess absorbs the warpage and bending of the base material and the joint fitting due to the biting at the required location with the bottom surface of the counterbore recess, and also occurs on the joint fitting. Bending moment can be reduced. The protrusion on this other side is
The shape is not limited to the blade shape, and may be a pyramid shape or another shape.

The shape of the counterbore recess around the bolt hole of the joint fitting is circular, oval, or the like corresponding to the shape of the joining assisting member.
The shape is rectangular or the like, and the depth thereof is a required dimension such that the blade-shaped projection on one surface projects from the joint surface.

The joining assisting member fitted in the counterbore recess around the bolt hole of the joint fitting is fixed to the joint fitting by adhesion by an adhesive, welding or the like, or by the protrusion of the other surface digging into the bottom surface of the counterbore recess. It is preferable that by doing so, the joining assisting member is integrated with the joint fitting, and the high strength bolt joining work can be easily performed.

The joining auxiliary member is joined to the periphery of the bolt hole of the joint fitting by welding or an adhesive that does not cause slippage with the joint fitting.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a cross-sectional view of a high-strength bolt joint structure according to a first embodiment of the present invention and an enlarged view of a main part thereof. This high-strength bolt joint structure is made of a structural material such as SS41, and is made of a structural member (base material) 1 that is linearly butted and the same structural member. Attaching plates (joint metal fittings) 2 arranged on both sides across the parts,
This is a friction welding method in which high-strength bolts 5 inserted through the respective bolt holes 3 and 4 are tightened and joined.

That is, this high-strength bolt joint structure is
It is made of a material having strength and hardness equal to or higher than those of the steel frame structure material 1 and the attachment plate 2, and has a bolt hole 6 at the center as shown in FIGS. The size of the range affected by the tightening force of the bolt 5, for example, in the case of a high strength bolt diameter of 16 to 25 mm and an added plate thickness of 12 mm, an annular plate shape having an outer diameter of 40 to 70 mm. A joining assisting member 9 in which a concentric blade-shaped protrusion 8 is formed on one surface (upper surface in FIG. 4) of the body 7 is a bolt hole in a joining surface 10 of the attachment plate 2 joined to the steel structure material 1. 4, a blade-shaped projection 8 is projected from a joining surface 10 in a spot facing recess 11 slightly larger than the joining assisting member 9 and the other surface is made into a spot facing depression 11 by an unillustrated bonding method. It is fixedly fitted to the bottom surface of the, and the above bolt holes 3, 4 and 6 are inserted. The high-strength bolts 5 which is a structure in which a steel structural member 1 and 添板 2 is clamped and joined.

In the high-strength bolt-joint structure of the friction-joining type having the above-mentioned structure, the joining assisting member 9 projects the projection 8 from the joining surface 10 in the counterbore recessed portion 11 around the bolt hole 4 of the attachment plate 2. Since the other surface is fixedly attached to the bottom surface, the joining auxiliary member 9 can be integrated with the attachment plate 2 to completely prevent slippage with the attachment plate 2, and the thickness of the plate-shaped body 7 can be reduced. The clearance can be eliminated to reduce the thickness of the high-strength bolt joint, and the joining work can be performed easily. Also, high strength bolt 5
By constricting the steel structure 1 and the attachment plate 2 by means of the concentric circular blade-shaped projections 8 surely bite into the joint surface 12 of the steel structure 1 and slip resistance in all directions can be obtained. The tightening force can be used efficiently, and the slip coefficient does not vary as in the past, the required slip strength can be constantly obtained, and the steel frame processing factory is used to increase the friction coefficient. Therefore, it is not necessary to process the steel structure material, and it is possible to easily and reliably perform on-site joining by high-strength bolt joining of the friction joining method. Further, since the joining auxiliary member is used for each high-strength bolt, the bolt arrangement can be arbitrarily set, and the joining auxiliary member is lightweight and small in size, easy to carry, and resource-saving can be achieved.

FIGS. 5 and 6 are perspective views of the high-strength bolt joint structure of the second embodiment of the present invention, and an enlarged cross-sectional view of the essential parts thereof. This high-strength bolt joint structure is made of a structural material such as SS41, and is a T-shaped portion 14 of a cross-shaped steel frame structural material (base material) 13 used as a pillar material and an I-shaped steel frame used as a beam material. Adjacent T-shaped portions 14 at the joining positions of the structural material 15
Connection fitting 16 for connecting the inside of the (the left side in FIG. 6)
And a structural material similar to that of the above-mentioned I-shaped steel frame structural material 15
T-shaped portion 1 corresponding to the connecting fitting 16 for joining the
4 and the T-shaped joint (joint metal fitting) 17 arranged on the outer side (right side in FIG. 6) of the bolt holes 18 and 1
It is of a tensile joining type in which high-strength bolts 21 through which 9 and 20 are inserted are tightened to join.

That is, this high strength bolt joint structure is
It is made of a material having strength and hardness equal to or higher than those of the steel structure 13, the coupling fitting 16 and the T-shaped joint 17, and has a bolt hole 22 in the central portion, as detailed in FIGS. 7 and 8. A plurality of linear blade-shaped protrusions 24 parallel to one direction on both sides of a circular plate-shaped plate-like body 23 having a size within a range affected by the tightening force of one high-strength bolt 21. The joining assisting member 25 formed with is the T-shaped portion 14 of the steel structure member 13.
A T-shaped joint joined to the outside of the T-shaped portion 14 and a counterbore recess 27 slightly larger than the joining assisting member 25 formed around the bolt hole 19 in the joining surface 26 of the connecting fitting 16 joined to the inside of the joint fitting 16. In the same counterbore recess 29 formed around the bolt hole 20 in the joint surface 28 of 17, the respective blade-shaped projections 24 are formed in the axial direction of the steel structure 13 (vertical direction in FIGS. 5 and 6). While extending, the blade-shaped projection 24 on one surface is projected from each of the joint surfaces 26 and 28, and the blade-shaped projection 24 on the other surface is pre-corroded with the bottom surfaces of the counterbore recesses 27 and 29. The bolt holes 18 and 1 are inserted into the bolt holes 18 or 1 by fixing them with an adhesive or the like.
This is a structure in which the T-shaped portion 14, the connecting fitting 16 and the T-shaped joint 17 are fastened and joined by a high-strength bolt 21 which inserts 9, 20, and 22.

In the high-strength bolted joint structure of the tensile joint type having the above-mentioned structure, as shown by an arrow 30 in FIG. 5, the T-shaped portion 1 of the steel-framed structural material 13 is formed by the steel-framed structural material 15.
When a tensile stress is applied to No. 4, the same operational effect as that of the first embodiment is obtained except that a slip proof force in the direction indicated by the arrow 31 is generated by the joining auxiliary member 25 in the adjacent T-shaped portions 14.

FIG. 9 is a sectional view of an essential part of a high strength bolt joint structure according to the third embodiment of the present invention. This high-strength bolt joint structure is made of a structural material such as SS41 and is made of an I-shaped steel frame structural material (base material) 32 used as a pillar material or the like, and is used as a beam material or the like. -Shaped steel frame structure material (not shown) and a T-shaped joint 33 arranged outside the flange of the steel frame structure material 32 (right side in FIG. 9) for joining the steel frame structure material 32 with the respective bolt holes. It is of a tensile joining type in which high-strength bolts 36 inserted through 34 and 35 are used for tightening and joining.

That is, this high strength bolt joint structure is
While having strength and hardness equal to or higher than those of the steel frame structural member 32 and the T-shaped joint 32, as shown in FIG. 10, it has a bolt hole 37 in the center and has a tightening force of one high-strength bolt 36. A circular plate-like plate-like body 3 having a size of an affected range
Joining auxiliary member 40 in which a plurality of blade-shaped projections 39 having a radial shape centered on the bolt hole 37 are formed on one surface of 8
Around the bolt hole 35 in the joint surface 41 of the T-shaped joint 33 that is joined to the steel structure member 32.
The steel frame structural member 32 and the T-shaped joint 3 are joined together by welding or an adhesive that does not cause slippage with the shaped joint 33, and the high-strength bolts 36 inserted through the bolt holes 34, 35, 37.
3 and 3 are fastened and joined.

In the high-strength bolt joint structure of the tensile joint system having the above construction, a gap corresponding to the thickness of the plate-like member 38 of the joint assistant member 40 is formed between the steel frame structural member 32 and the T-shaped joint 33. With, the same operational effect as that of the first embodiment can be obtained.

In the above-mentioned embodiment, the joining assisting members 9, 25, 4 having the blade-shaped projections 8, 24, 39 are used.
Although the case where 0 is applied to the high-strength bolt joint structure of the friction joining method and the tensile joining method has been described, the present invention is not limited to this and can be applied to the high-strength bolt joint structure of the bearing joint method.
Further, the blade-shaped projection formed on at least one surface is not limited to the concentric circle shape, the linear shape in one direction or the radial shape, and may be a spiral shape or the like, and the projections on both surfaces are not limited to the same shape. May have different shapes.

[0023]

As described above, according to the first high-strength bolt joint structure of the present invention, the joining assisting member projects the projection from the joining surface of the joint fitting so as to surround the bolt hole. Since it is fitted in the counterbore recess, slippage between the joining assisting member and the joint fitting can be completely prevented, and a gap corresponding to the thickness of the plate-shaped body can be eliminated to reduce the thickness of the high-strength bolt joint. On the other hand, according to the second high-strength bolt joint structure, the joining assisting member is joined to the joining surface of the joint fitting by the other surface having no protrusion, so that both are integrated and the joining work is facilitated. You can

In any high-strength bolt joint structure, since the blade-shaped projection is surely bited into the joint surface of the base material by tightening the base material and the joint fitting with the high-strength bolt, high strength is achieved. The tightening force of the bolts can be used efficiently, and the slip coefficient does not vary as in the past, the required slip resistance can be constantly obtained, and the steel frame is used to increase the friction coefficient. Since it is not necessary to process the base material in the processing factory, it is possible to easily and reliably perform on-site joining by high strength bolt joining. Further, since the joining auxiliary member is used for each high-strength bolt, the bolt arrangement can be arbitrarily set, and the joining auxiliary member is lightweight and small in size, easy to carry, and resource-saving can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of a high-strength bolt joint structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a plan view of a joining assisting member used in the high-strength bolt joint structure shown in FIG.

FIG. 4 is a half cross-sectional side view of the joining auxiliary member shown in FIG.

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

6 is a cross-sectional view of a main part of the high-strength bolt joint structure shown in FIG.

FIG. 7 is a front view of a joining auxiliary member used in the high-strength bolt joint structure shown in FIG.

8 is a half cross-sectional plan view of the joining auxiliary member shown in FIG.

FIG. 9 is a sectional view of an essential part of a high-strength bolt joint structure according to a third embodiment of the present invention.

FIG. 10 is a front view of a joining auxiliary member used in the high-strength bolt joint structure shown in FIG.

[Explanation of symbols]

 1 Steel structure material (base material) 2 Addition plate (joint metal fitting) 3 Bolt hole 4 Bolt hole 5 High-strength bolt 6 Bolt hole 7 Plate-like body 8 Blade-like projection 9 Joining auxiliary member 10 Joining surface 11 Counterbore recess 13 Steel frame Structural material (base material) 17 T-type joint (joint metal fitting) 18 Bolt hole 19 Bolt hole 20 Bolt hole 21 High-strength bolt 22 Bolt hole 23 Plate-like body 24 Blade-like protrusion 25 Joining auxiliary member 28 Joining surface 29 Counterbore recess 32 Steel frame structure material (base material) 33 T-shaped joint (joint fitting) 34 Bolt hole 35 Bolt hole 36 High-strength bolt 37 Bolt hole 38 Plate-like body 39 Blade-like protrusion 40 Joining auxiliary member 41 Joining surface

Claims (2)

[Claims] 1. A strength and hardness equal to or higher than those of the base material and the fitting, and having a bolt hole at the center, and
Of a joint metal fitting in which a joining auxiliary member having a blade-like projection formed on at least one surface of a plate-like body having a size within a range affected by the tightening force of a high-strength bolt of a book is joined to a base metal It is fitted in the counterbore recess formed around the bolt hole in the surface so that the projection on one surface projects from the joint surface, and the base material and the joint metal fitting are tightened by the high-strength bolts that pass through the above bolt holes. A high-strength bolt joint structure characterized by being joined together. 2. The base material and the joint fitting have strength and hardness equal to or higher than those of the base material and a bolt hole at the center, and
Of the plate-shaped body having a size within the range of the influence of the tightening force of the high-strength bolt of the book, the joining auxiliary member having the blade-shaped projection formed on one surface A high-strength bolt joint structure, which is joined to the periphery of the bolt hole by the other surface, and the base material and the joint metal fitting are fastened and joined by a high-strength bolt inserted through each of the bolt holes. ..