JP2002180555A - Friction joint structure for steel by means of high- strength bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction joint part making sliding yield strength increased without being attended with a particular factor, such as an improvement in working accuracy, of a cost increase. SOLUTION: Splice plates 3 are disposed on both of the surface and backside of steel 2 across the end of the steel 2 to be joined, and the friction joint part 1 is joined by plural high-strength bolts 5 inserted into respective bolt holes 2a and 3a of the steel 2 and the splice plate 3. The joint part 1 is characterized as follows: a faying-surface extending member 4 is made to abut on each of the splice plates 3 in an superposed manner; the bolt holes 2a and 4a of the steel 2 and the member 4 are formed so that the diameters of the bolt holes 2a and 4a can be approximately equal to the shank diameter of the bolt 5; each steel 2, the splice plate 3 and the member 4 are fastened for compressive bonding with the bolts 5; and friction action both between each steel 2 and the splice plate 3 and between the member 4 and the splice plate 3 makes the sliding yield strength of the joint part 1 increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction joining structure of a steel material in a building steel structure or another steel structure using a high-strength bolt.

[0002]

2. Description of the Related Art Steel structural members are generally joined by welding or high-strength bolt friction joining. In the welding connection, since the materials to be joined are metallurgically joined, it is possible to secure a joint strength equal to or higher than the material to be joined. However, in high-strength bolt friction welding, the proof stress (slip resistance) of the joint is the product of the introduced tension of the high-strength bolt and the friction coefficient between steel materials. It is difficult to secure slip resistance.

[0003] On the other hand, in the case of welding, the mechanical quality of the weld is greatly affected by the skill of the welder, and sufficient measures against wind and rain are required. Requires a great deal of management and effort.
Therefore, there is a demand for a high-strength bolted frictional joint having relatively high mechanical strength at which the mechanical quality of the joint is relatively easy.

[0004] Conventionally, as a friction joining structure of a steel frame member using a high-strength bolt, for example, FIG. 8 (first conventional example), FIG.
(Second conventional example) and FIG. 10 (Third conventional example). 8 and 9 show each steel frame member 1.
0 is provided with a bolt hole 10a, and the superposed surface (friction surface) of the steel auxiliary plate 11 superposed on one or both surfaces of each steel frame member 10 is managed in a red rust state or a blasting state, A bolt hole 11a is provided in the plate 11, and each steel frame member 10 is tightened by the high-strength bolt 12 inserted and tightened across the bolt holes 10a, 11a.
Are connected. 8 (a) and 9 (a)
8A and 8B are side views of the joint, and FIGS. 8B and 9B
3A is a sectional view taken along the line EE of FIG. 1A, and FIG.

[0005] FIG. 10 shows a steel accessory plate 13.
Are formed on the overlapped surface (friction surface) of. FIG. 10A is a side view of the joining portion.
(B) is a view on arrow G in FIG.

[0006]

8 and 9, the treatment of the friction surface is relatively simple and the production cost is small, but a large slip resistance cannot be obtained. On the other hand, FIG.
However, there is a problem that high precision, heat treatment and quality control are required for forming the unevenness 14 on the superposed surface of the steel auxiliary plate 13, although a large slip resistance can be obtained. In addition, if the tightening axial force is increased, the slip strength can be improved, and there is a method using ultra-high strength bolts, but due to the problem of delayed fracture, it is necessary to pay sufficient attention to the chemical composition and heat treatment of steel materials. There is a problem that there is.

On the other hand, there is a method in which the joint portion has a high yield strength by using a high-strength bolt bearing joining structure separately from the friction joining structure. In this method, a bolt hole diameter of a steel material to be joined is made closer to a bolt shaft diameter to reduce deformation due to slip, and an allowable deformation amount (0.2 to 0.5 mm) is used.
Degree of deformation), (a) frictional force between steel members,
(Ii) The shear force of the bolt shaft and (iii) the bearing force of the joint member are made to act simultaneously. Since the stress can be transmitted by the above (ii), (ii) and (iii), the allowable proof stress is reduced. It will be bigger. Thus,
Compared to “normal high-strength bolt friction welding”, ie, the clearance between the bolt holes 10 a, 11 a and the shaft diameter of the bolt 12 is large (for example, about 2 mm), and the allowable proof strength is compared to the welding in which only frictional force can be expected. Will be large. However, if there is a discrepancy between the bolt holes, it is necessary to carry out reamer processing and drive the bolts, and there is a problem in workability.

Therefore, the present invention provides a high-strength steel sheet having improved slip resistance by simply arranging a member for increasing a friction surface at a joint without a special cost increase factor such as improvement of processing accuracy. An object is to provide a bolt friction joint.

[0009]

In order to solve the above-mentioned problems, a first aspect of the present invention is to dispose a siding plate over an end of a steel material such as a steel frame member to be joined, as well as the steel material and the siding plate. In the frictional joining structure of steel materials joined by high-strength bolts inserted into the bolt holes of the above, the friction surface additional member is brought into contact with at least one of the steel material or the auxiliary plate so as to overlap, and friction with the steel material The hole diameter of each bolt hole of the surface extension member is formed close to the shaft diameter of the high strength bolt, and the steel material, the attachment plate and the friction surface addition member are tightened and crimped with the high strength bolt, and the steel material is attached to the steel member. It is characterized in that the sliding resistance of the joint is improved by the frictional action between the plate and the frictional surface between the member for adding a friction surface and the steel material or the auxiliary plate.

According to a second aspect of the present invention, an attachment plate is disposed on both front and back surfaces of a steel material such as a steel member to be joined, and is inserted into each bolt hole of the steel material and the attachment plate. In a friction joining structure of steel materials joined by high-strength bolts, a friction surface addition member is brought into contact with each of the attachment plates so as to overlap with each other, and a hole diameter of the bolt hole between the steel material and the friction surface addition member is increased by a high-strength bolt. Formed in close proximity to the shaft diameter of each steel material, and tightening and tightening each of the steel materials, the auxiliary plate, and the member for adding a friction surface by means of high-strength bolts, and the frictional action between the steel material and the auxiliary plate, It is characterized in that the sliding resistance of the joint is improved by the frictional action between the member and the attachment plate.

Further, according to the present invention, the ends of steel materials such as steel members to be joined are overlapped with each other, and the friction of the steel materials joined by high-strength bolts inserted through the bolt holes of the respective steel materials. In the joining structure, the friction surface additional member is brought into contact with one of the steel members so as to overlap, and the other steel member and the friction surface additional member are formed so that the hole diameter of the bolt hole is close to the shaft diameter of the high-strength bolt, The steel member and the member for adding a friction surface are tightened and pressed by a high-strength bolt to improve the slip resistance of the joint by the frictional action between the steel member and the member for adding a friction surface. This is a frictional joining structure of steel materials using force bolts.

Furthermore, in the invention of claim 4,
The friction joining structure of steel materials by a high-strength bolt according to claim 1 or 2, wherein a high friction treatment is performed on both sides of the base plate to obtain a slip coefficient of 0.6 or more.

Further, in the invention of claim 5, the frictional surface on the side plate side or the frictional surface on the steel material side of the additional member for friction surface is subjected to a high friction treatment for obtaining a slip coefficient of 0.6 or more. A friction joining structure using the high-strength bolt according to any one of Items 1 to 3.

According to the sixth aspect of the present invention, the frictional surface joining member is also used in place of the washer of the high-strength bolt to frictionally join the steel material with the high-strength bolt. Structure.

Further, in the invention according to claim 7, a female screw threadedly engaged with a male screw of a high-strength bolt inserted through the bolt hole of the friction surface additional member disposed on the nut side of the friction surface additional member. And being formed integrally with the nut.
A friction joining structure of a steel material using the high-strength bolt according to any one of (a) and (b).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the illustrated embodiments. [First Embodiment] A first embodiment of the present invention will be described mainly with reference to FIGS.
This will be described with reference to 2, 4, and 6. FIGS. 1A and 1B are a plan view and a side view of a frictional joint 1 of the present embodiment, and FIG. 1C is a cross-sectional view taken along line AA of FIG. FIG. 2 is an enlarged sectional view of the friction joint 1. 4 and 5
Fig. 4 shows a specimen having a frictional joint structure according to the present invention, Fig. 4 shows a specimen having a double shearing type, Fig. 5 shows a specimen having a single shearing type, and Fig. 6 shows an embodiment of the present invention. It is a figure which shows the test result of the test member of the high-strength bolt friction joining part of the double surface shear type and the single surface shear type, and the normal test member which does not apply this invention.

As shown in FIGS. 1 (a) to 1 (c), the friction joint 1 is a friction surface made of a thick steel plate having a steel material 2, a steel attachment plate 3, and a bolt insertion hole 4a. The extension member 4 and the high-strength bolt 5 are constituted by a nut 5a and a washer 5b which are screwed and tightened thereto. The steel material 2
Is a member (steel material) corresponding to a steel plate portion to be joined in a flange or a web or a steel frame member such as a column or a beam such as an H-beam or the like adjacent in series in the vertical or horizontal direction. The frictional surface addition member 4 is configured such that when a tensile force or a compressive force is applied to the frictional joint in a state where the steel materials 2 are joined to each other, The inner peripheral surface of the bolt insertion bolt hole is pressed from the outer peripheral surface of the high-strength bolt 5, and the surface of the additional friction surface member 4 on the side of the auxiliary plate 3 (the inner friction surface) and the contact surface of the auxiliary plate 3 side This is a member for adding a friction surface for applying a frictional force between the members.

The steel materials 2 to be joined are arranged in series at intervals, and the end faces of the respective steel materials 2 are arranged to face each other.
Are superposed on the front and back surfaces of the end of the steel material 2. Further, a friction surface additional member 4 is superimposed on the outside of each attachment plate 3, and is inserted across the friction surface addition member 4, the attachment plate 3, and the through holes 2 a, 3 a, 4 a of the steel material 2. The high-strength bolts 5 and the nuts 5a screwed to the high-strength bolts 5 firmly tighten the members so that the members are firmly pressed. The diameter 2a of the bolt hole between the steel member 2 and the friction surface addition member 4 is formed to be the shaft diameter (d) of the bolt 5 +0 to 0.1 mm, that is, the hole diameter of the bolt hole 2a of the steel member 2 and the friction surface By making the hole diameter of the bolt hole 4a of the additional member 4 substantially equal to the nominal diameter of the high-strength bolt 5, the steel member 2, the friction surface additional member 4 and the high The three members of the force bolt 5 are configured to be regarded as integral joining elements.

The bolt hole diameter of the both attachment plates 3 in the case of the present invention may be the same as that in the case of normal friction welding, but the clearance between the bolt hole 2a of the steel material 2 and the high-strength bolt 5 is "normal high-strength". The bolt holes 3a of both attachment plates 3 are usually smaller in the case of normal friction joining (the hole diameter of the normal friction joining is based on the Building Standard Law). , M27 less than bolt shaft diameter + 2mm,
M27 or more may be formed in an oversized hole (large diameter hole) larger than the bolt shaft diameter + 3 mm) to ensure workability and not to interfere with the shaft portion of the high-strength bolt 5. .

When, for example, a tensile external force (P) acts on the frictional joint 1, before the main slip occurs, the frictional joint 1 shown in FIG.
As shown by bold lines, the frictional external force (P) is transmitted by the frictional portion F1 between the steel material 2 and the attachment plate 3, and the frictional surface additional member is interposed by the high-strength bolt 5 as shown by the thick lines. Power is transmitted by a friction portion F2 between the base plate 4 and the attachment plate 3. In this case, the number of friction surfaces is simply doubled as compared with the case where the additional friction surface member 4 is not provided, so that the slip resistance is further increased. Usually, as the distance from the bolt core of the high-strength bolt 5 in the radial direction decreases, the contact pressure of the friction surface of the friction surface additional member 4 decreases.
It is sufficient if the size is large enough to cover up to four times the distance.

The mechanism will be further described. When a tensile external force (P) acts on each steel material 2, the bolt hole 2a of the steel material 2 comes into contact with the shaft of the high-strength bolt 5 by a displacement of the degree of elastic deformation. The bolt hole 2 of the steel material 2
A pressing force f1 in the direction perpendicular to the bolt axis as shown by an arrow from the inner peripheral surface of the a acts on the high-strength bolt 5, and each friction surface is increased at both ends of the high-strength bolt 5 in the axial longitudinal direction. A pressing force f2 in the direction perpendicular to the bolt axis as shown by the arrow from the outer peripheral surface of the high-strength bolt 5 is applied to the inner peripheral surface of the bolt insertion bolt hole 4a of the member 4 for use. It acts on the inner peripheral surface. Thereby, it is possible to apply a pressing force in the same direction parallel to the pulling external force (P) to each friction surface additional member 4, and therefore,
A frictional action can be exerted on the contact surface between each additional member 4 for friction surface and the auxiliary plate 3. In the case of this structure, since the attachment plates 3 are arranged on both sides of the steel material 2 and the shear force is borne by the high-strength bolt 5 by the two surfaces of these joint surfaces, the two-surface shear type friction joining It is.

In the present embodiment, the clearance of the bolt hole 2a of the steel material 2, the shear deformation of the high-strength bolt 5,
The shape and dimensions of each of the plates 2, 3, and 4 are set to minimize the bearing deformation.

FIGS. 4 (a) to 4 (c) show steel members 2 to be friction-joined.
Among them, the specimen 7 in a state where the right side steel material 2 is joined with one high strength bolt 5 and the left side steel material 2 is joined with two high strength bolts 5 is shown. Here, each member of the test body 7 will be described with the same reference numerals as in FIGS.

The test piece 7 is 85 mm wide and 16 mm thick.
And a 9 mm thick auxiliary plate 3 having the same width as that described above is disposed on both sides of the steel material 2 so as to overlap the same. The friction joint according to claim 1, which is disposed outside. The high strength bolt 5 (one piece) on the right side has a strength of F10T and a bolt shaft diameter of M16. Bolt holes 4 of friction member 4
The diameter of a and the diameter of the bolt hole 2a of the steel material 2 are the shaft diameter (d) of the high-strength bolt 5 +0 to 0.1 mm (small clearance).
Further, the bolt hole 3a of the attachment plate 3 is formed to have a shaft diameter (d) of the high-strength bolt 5 + 2 mm. The left high-strength bolt (two bolts) has a strength of F10T and a bolt shaft diameter of M2.
Since it is set to 0, the slip strength of the joint of the test piece 7 is determined on the right side. Further, a second embodiment described later (FIG. 3)
5 (a) to 5 (c).
Specimen 8 is a one-side shear type friction joining in which the attachment plate 3 is applied to only one surface of the steel material 2, and other conditions are set to be the same as those of the specimen 7. The test result of the test piece 7 is shown by a curve A in FIG. 6, and the test result of the test piece 8 is shown by a curve B in FIG.

For comparison with the above-mentioned specimens 7 and 8, a “normal specimen” using a normal high-strength bolt and not having a friction surface extension member was tested, and this was plotted with a curve C (two sides). Shear type) and curve D (one-sided shear type). In this normal test body, the bolt hole 2a of the steel material 2 and the bolt hole 3a of the attachment plate 3 are normal holes, and the gap between the inner peripheral surface of the bolt insertion through hole of the washer and the outer peripheral surface of the high-strength bolt is large. (Not shown).

FIG. 6 shows that a tensile force (P) is applied to each of the test specimens 7 and 8 and the ordinary test specimen in which the present invention is applied, and the tensile force (P) and the slip amount of the joint (the steel material on the right side) are shown. 2)
The test results comparing the relationship with are shown below together with the member conditions of the individual test pieces. The vertical axis in FIG. 6 is the tensile force P (k
N), and the horizontal axis shows the slip amount (δ) of the frictional joints joined by one of the high-strength bolts 5. The thick arrow in the load-slip curve of the test piece under each condition is a point at which the maximum load is reached, and indicates the slip strength of the right-side frictional joint.
As shown in the figure, the superiority (improvement) of the present invention was clearly confirmed particularly with respect to the load resistance of the test pieces 7 and 8 until the slip strength indicated by the positions of the arrows A1 to D1 was reached and thereafter. Curve A: A case of the friction joining structure of the present invention having a double shearing type, the bolt holes of the attachment plate 3 being ordinary holes, and having the friction surface additional member 4. Curve B: a case of the frictional joint structure of the present invention having a single shearing type, a bolt hole in the attachment plate 3 being a normal hole, and a friction surface additional member 4. Curve C: A double-shear type, in which the bolt hole of the steel material 2 is a normal hole and a friction joint structure using a normal high-strength bolt without a friction surface additional member. Curve D: A case of a frictional joint structure using a normal shearing bolt, in which the bolt hole of the steel material 2 is a normal hole and a normal high-strength bolt without a friction surface addition member is used.

As can be seen from FIG. 6, in the test specimen (curve A) of the present invention, the clearance between the steel material 2, the bolt holes 2 a, 4 a of the friction surface extension member 4, and the shaft of the high-strength bolt 5 is reduced to near zero. As a result, the frictional effect of the additional friction surface member 4 is sufficiently exerted, so that a slip resistance of 268 kN is obtained. On the other hand, in the case of a friction joining structure using a normal high-strength bolt (curve C), the slip strength is 141 kN. Therefore, the test piece of the present invention has improved the slip strength by 127 kN with respect to the ordinary friction structure, and the slip strength is almost doubled.

As described above, in the friction joint portion 1 of the present embodiment, the number of friction surface extension members 4 is increased as compared with the above-described conventional normal friction joint, but no special treatment is required for each of the members 2, 3, and 4. It can be manufactured at low cost and has high reliability of friction joining.

Further, even in the case where the steel material 2 is coated or the steel material 2 is in a black scale state, the same slip resistance as a normal high-strength bolt friction joint having a red rust surface is ensured. The advantage is that special treatment of the friction surface is not required.

On the other hand, although it depends on the shearing of the shaft of the high-strength bolt 5 and the bearing pressure of each plate, it is apparently friction welding unlike bearing bearing bonding, and by providing an excessive bolt hole 3a in the attachment plate 3, It is possible to flexibly cope with a discrepancy between the bolt holes 2a and 3a, and no special operation such as reaming is required.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. FIGS. 3A and 3B are a plan view and a side view of the frictional joint 6 of the present embodiment.
(C) is a sectional view taken along the line CC in FIG.

The frictional joint 6 of this embodiment differs from the first embodiment (FIG. 1) in that the attachment plate 3 is applied to only one surface of the steel material 2, and the other structure is the same as that of the first embodiment. Same as the form. Therefore, duplicate description will be omitted. In the case of this structure, since the attachment plate 3 is disposed on one side of the steel material 2 and the shear force is applied to the high-strength bolt 5 by one surface of the joining surface, the single-surface shear type friction welding is performed.

As can be seen from FIG. 6, the test piece (curve B) of the present invention has the configuration shown in FIGS. 3 (a) to 3 (c), and the number of friction surfaces of the friction joint 6 is the same as that of the first embodiment. Although it is smaller than that, the provision of the friction surface additional member 4 that makes the clearance between the bolt hole 4a and the high-strength bolt 5 close to zero provides a slip resistance of 133 kN. On the other hand, in the case of a friction joining structure using a normal high-strength bolt (curve D), the slip strength is 68 kN. Therefore, the specimen of the present invention has a sliding resistance improved by 65 kN with respect to the ordinary friction structure, and the sliding resistance is almost doubled even in the case of the single shearing type. Thereby, even if it is a one-sided friction joining of the steel material 2 and the base plate 3 as in the present embodiment, a high yield strength can be obtained. Compared to the two-sided friction welding (FIG. 1) used to polymerize on both the front and back surfaces, the method is simpler and the workability is improved.

[Third Embodiment] A third embodiment of the present invention will be described with reference to FIGS. FIG.
(A), (b) is a plan view of the frictional joint 9 of the present embodiment,
It is a side view, and FIG.7 (c) is DD sectional drawing of Fig.7 (a). In the case of this structure, since the shear force is applied to the high-strength bolt 5 by one surface of the joint surface between the steel materials 2, the single-surface shear type friction welding is performed.

In the friction joint portion 9 of the present embodiment, the steel plate 2 is superposed on the steel plate 2 by omitting the attachment plate 3, and the bolt hole 2a of one of the steel plate 2 is brought close to the shaft diameter of the high-strength bolt 5, and its clearance is increased. The second point is that the bolt hole 2b of the other steel material 2 is used as a normal hole and the friction surface addition member 4 is disposed outside the other steel material 2 having the bolt hole 2b having the normal hole. This is different from the embodiment (FIG. 3).

With the configuration shown in FIGS. 7A to 7C, the number of friction surfaces of the frictional joint 9 is the same as in the second embodiment.
Although it is smaller than that of the first embodiment, the other steel member 2 is provided with the friction surface additional member 4,
Friction welding with high slip strength is possible. Thereby, even in the case of one-sided friction joining between the steel materials 2 as in the present embodiment, high yield strength is obtained as in the second embodiment. 3
Compared to the two-sided friction joining (FIG. 1) in which the steel sheet 2 is superposed on the front and back surfaces of the steel material 2, the workability is improved, and the number of parts is reduced as compared with the case of the second embodiment. Therefore, the steel materials 2 can be frictionally joined to each other economically.

When practicing the present invention, at least 0.6
As the high friction treatment for obtaining the above slip coefficient, grid blast is adopted as a surface roughness treatment, for example,
By making the surface hardness and the surface roughness of the friction surfaces on both surfaces of the attachment plate 3 larger than the surface hardness and the surface roughness of the friction surface of the steel material 2 or the friction surface extension member 4 to be frictionally joined, respectively. , A slip coefficient of 0.6 or more is obtained.

In the same manner as described above, the surface hardness and surface roughness of the friction surface of the friction surface additional member 4 on the side that comes into contact with the auxiliary plate 3 are determined by adjusting the friction surface of the steel material 2 or the auxiliary plate 3 to be frictionally joined. By making the surface hardness greater than the surface hardness and the surface roughness, a slip coefficient of 0.6 or more can be easily obtained.

More specifically, for example, the surface hardness of the friction surface of the steel material 2 is about Hv160, the surface roughness is about 70 μm to 150 μm, and the surface hardness of the steel material 2 of the attachment plate 3 and the friction surface addition member 4 is set. When the hardness ratio with respect to the hardness is 1.3 or more to about 2.5, a slip coefficient of 0.6 to 0.85 can be secured, and the attachment plate 3 and the friction surface additional member 4
And the relationship can be similarly applied.

When the slip coefficient of 0.9 or more is secured, the hardness of the surface layer of the friction surface of the attachment plate 3 and the friction surface additional member 4 and the hardness of the surface layer of the friction surface of the steel material 2 are determined. The ratio is 2.5 or more, the depth of the layer where the hardness of the surface layer is large is 0.2 mm or more, and a triangular wave shape or pyramid along the surface on the side where the hardness of the surface layer is large. And the height of the projections is 0.2 to 0.1 mm, and the maximum surface roughness of the surface (steel material 2) on the side where the hardness of the surface layer is small (the steel material 2) is determined by the height of the projections. By making it sufficiently smaller than the above, a slip coefficient of 0.9 or more can be secured, and the relationship between the attachment plate 3 and the friction surface additional member 4 can be similarly applied.

It is preferable that the plurality of projections are provided so as to be continuously repeated, and the processing means is formed by cutting, laser processing, knurling, plasma processing, or the like, in a uniform form along the friction joining surface. Good to do.

In each of the above embodiments, the washer 5b was brought into contact with the head of the bolt 5 and the friction surface addition member 4, but when the present invention is carried out, the friction surface addition member 4 was used. Since there is a pressing effect due to the diffusion of the tightening force similar to that of the washer, the washer 5b may be omitted and only the friction surface additional member 4 may be used.

In the illustrated embodiment, the frictional surface addition member 4 on the nut 5a side and the frictional surface addition member 4 on the head side of the bolt 5 are formed as independent friction surface addition members 4 respectively.
However, when the washer 5b is omitted and only the friction surface addition member 4 is used, the nut 5a of the friction surface addition member 4 is used.
7 is formed integrally with the nut 5a, and the bolt hole of the friction surface additional member 4 is formed as shown in FIG.
As shown in (d), a female screw hole may be formed to be screwed with the male screw shaft portion of the high-strength bolt 5 inserted therethrough, and the female screw hole may be formed in series with the female screw hole of the nut 5a. . The bolt hole of the frictional surface addition member 4 may be a simple through hole, but if it is a female screw hole, the length of the screw engraved portion of the high strength bolt 5a may be slightly increased, and the high strength bolt 5
Since the screw joint between the a and the nut 5a is further added to the friction surface additional member 4, the screw joint with the high-strength bolt 5a can be ensured. In addition, when the friction surface additional member 4 is formed integrally with the nut 5a, a frictional joining structure of steel using a high-strength high-strength bolt with a reduced number of parts can be obtained. In this case, the shape of the portion for the additional friction surface member 4 may be circular or rectangular.

[0044]

As is apparent from the above description, according to the first aspect of the present invention, the number of friction surfaces is increased by simply superimposing the friction surface addition member on the backing plate, and the steel material and the friction surface extension are added. When the member for use is substantially integrated with the high-strength bolt, it is possible to obtain a friction joint having an increased slip resistance.

Further, since no special treatment is required for the friction surface of each member, an inexpensive and highly reliable friction joint can be obtained.

According to the second aspect of the present invention, since the additional friction surface member and the auxiliary plate are arranged on both the front and back surfaces of the steel material, the number of friction surfaces is increased as compared with the case where only one surface of the steel material is arranged. As a result, a friction joint with further improved sliding resistance is obtained.

According to the third aspect of the present invention, even in the case of friction joining using a high-strength bolt of a single-shear type, high-strength friction joining in which the sliding strength is increased by merely using a member for adding a friction surface. A part can be obtained, and the attachment of the steel material can be simplified, and the workability can be improved.

In addition, as described in claim 4, both sides of the base plate have a thickness of 0.1 mm.
When high friction treatment is performed to obtain a slip coefficient of 6 or more,
It is possible to easily form a frictional joining structure of a steel material using a high strength bolt having a high proof stress.

Further, when the friction surface on the base plate side or the friction surface on the steel material side of the additional friction surface member is subjected to a high friction treatment for obtaining a slip coefficient of 0.6 or more, it is further easier. In addition, a friction joining structure using a high-strength high-strength bolt can be provided.

Further, when the friction surface addition member is used in place of the washer of the high-strength bolt, the washer can be omitted, and the friction surface addition member can be replaced by the friction surface addition member. The frictional joining structure of a steel material by a high-strength high-strength bolt can be achieved without changing the strength.

According to a seventh aspect of the present invention, the bolt hole of the friction surface addition member disposed on the nut side of the friction surface addition member is connected to the female screw which is screwed with the male screw of the high-strength bolt inserted therethrough. When formed and integrally formed with the nut, the screw joint between the high-strength bolt and the nut is further added to the screw joint with the friction surface additional member, so that the screw joint with the high-strength bolt is ensured. And a frictional joining structure of steel materials using high-strength high-strength bolts with a reduced number of parts.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a side view of a first embodiment of the present invention, and FIG. 1C is a sectional view taken along line AA of FIG.

FIG. 2 is an enlarged sectional view of the first embodiment.

FIGS. 3A and 3B are a plan view and a side view of a second embodiment of the present invention, and FIG. 3C is a cross-sectional view taken along line CC of FIG.

4 (a) and 4 (b) are a plan view and a side view of a test piece of a double shear type, and FIG. 4 (c) is a cross-sectional view taken along the line BB of FIG. 4 (a).

FIGS. 5A and 5B are views showing a test piece having a frictional joint structure of a single shearing type, wherein FIGS. 5A and 5B are a plan view and a side view of the test piece, and FIG. FIG.

FIG. 6 shows the relationship between the tensile force (P) and the slip amount of the joint (the amount of movement of the steel material on the right side) by applying a tensile force (P) to each of the test pieces and a normal test piece. It is a figure showing a test result.

7 (a) and 7 (b) are a plan view and a side view of a third embodiment of the present invention, FIG. 7 (c) is a sectional view taken along line DD of FIG. 7 (a), and FIG. It is a figure which shows the form at the time of molding a nut and the member for additional friction surfaces integrally.

8A is a side view of the first conventional example, and FIG. 8B is a cross-sectional view taken along the line EE of FIG. 8A.

FIG. 9A is a side view of the second conventional example, and FIG. 9B is a sectional view taken along line FF of FIG. 9A.

FIG. 10A is a side view of a third conventional example, and FIG.
FIG. 3 is a view as viewed from the direction of the arrow G in FIG.

[Explanation of symbols]

1, 7 Friction joint 2 Steel material (steel material) 2a, 2b, 3a, 4a Bolt hole 3 Attached plate (attached plate) 4 Member for additional friction surface (member for additional friction surface) 5 High-strength bolt 5a Nut 5b Washer 6 Test Body 7 Specimen 8 Specimen 9 Friction joint 10a Bolt hole 11 Steel splint 11a Bolt hole 12 High strength bolt 13 Steel splint 14 Unevenness

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E125 AA51 AA70 AC14 AE13 AG12 BB02 BB08 BB22 BB33 BB37 BD01 BD07 BE02 BE06 BE08 BF06 BF08 CA05 CA06 CA07 CA09 CA19 CA95 DA01 EA14 EB02

Claims (7)

[Claims] 1. A friction joining structure for a steel material to be joined by arranging an auxiliary plate over an end portion of a steel material such as a steel frame member to be joined, and being joined by high-strength bolts inserted into bolt holes of the steel material and the accessory plate. In the above, the friction surface addition member is brought into contact with at least one of the steel material and the auxiliary plate so as to overlap, and the hole diameter of each bolt hole of the steel material and the friction surface addition member is close to the shaft diameter of the high-strength bolt. The steel material, the attachment plate and the member for adding a friction surface are tightened and pressed by a high-strength bolt, and the frictional action between the steel material and the attachment plate, the member for adding a friction surface and the steel material or the attachment plate are formed. A frictional joining structure for steel materials using high-strength bolts, which enhances the slip resistance of the joining portion by a frictional action between the steel and the joint. 2. A steel plate such as a steel member to be joined is provided with an attachment plate on both front and back surfaces of the steel material, and is joined by high-strength bolts inserted into bolt holes of the steel material and the attachment plate. In the friction joining structure of a steel material, the friction surface addition member is brought into contact with each of the additional plates so as to overlap with each other, and the diameter of the bolt hole of the steel material and the friction surface addition member is brought close to the shaft diameter of the high-strength bolt. The steel material, the base plate, and the friction surface addition member are tightened and pressed by a high-strength bolt to form a frictional action between the steel material and the base plate and the frictional action between the friction surface addition member and the base plate. The frictional joining structure of steel with high-strength bolts, which enhances the slip resistance of the joint by the frictional action of the steel. 3. A friction joining structure for a steel material, in which ends of steel materials such as steel members to be joined overlap with each other and are joined by high-strength bolts inserted through bolt holes of the respective steel materials. The contact member is formed so as to overlap with one of the steel members, and the diameter of the bolt hole of the other steel member and the friction surface addition member is made close to the shaft diameter of the high-strength bolt, and the friction surface is added to each of the steel materials. The high-strength bolt with a high-strength bolt by tightening and compressing the member with a high-strength bolt to improve the slip resistance of the joint by the frictional action between the steel member and the friction-surface-enhancing member. Construction. 4. The frictional joining structure of steel materials with high-strength bolts according to claim 1, wherein a high friction treatment is performed on both sides of the base plate to obtain a slip coefficient of 0.6 or more. 5. The friction surface adding member according to claim 1, wherein the friction surface on the side plate side or the friction surface on the steel material side of the additional member for friction surface addition is subjected to a high friction treatment for obtaining a slip coefficient of 0.6 or more. Friction joining structure using the high-strength bolt described. 6. The friction joining structure for steel materials by using high-strength bolts according to any one of claims 1 to 3, wherein the friction surface additional member is used in place of the washer of the high-strength bolt. 7. A bolt hole of a friction surface addition member disposed on a nut side of the friction surface addition member is formed in a female screw which is screwed with a male screw of a high-strength bolt inserted therethrough. 7. The frictional joining structure of steel materials by a high-strength bolt according to any one of claims 1 to 3, characterized by being formed integrally with the steel.