JP2001182155A - Vibration-control structure for bolt joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-control structure for a bolt joint part, where a spring member is easily assembled at a prescribed position related to a bolt and pressure-welded board. SOLUTION: Between webs 10a and 11a of two steel frame members 10 and 11 which are jointed together, splice plates 14 are arranged from both sides. Each plate 14 is integrally fitted to the steel frame member 10 with a high strength bolt 21 while being fitted for relative movement to the steel frame member 11, through a slot 19 using a high strength bolt 20. A hollow cylinder part 24a, inserted as a spacer between the bolt 20 and a spring member 22, is integrally formed at a washer 24 attached around the bolt 20, together with the spring member 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure provided at a bolt joint for connecting steel members constituting a building frame, and more particularly to a technique for improving the ease of assembling bolts.

[0002]

2. Description of the Related Art A building frame formed by connecting steel columns and steel beams to each other is generally applied to a multi-story building, in which a brace is used as a resistance element against a horizontal force such as an earthquake or wind. Can be These steel columns, steel beams and steel members such as braces are joined together by welding or bolts to form a rigid frame structure.Especially when bolted, excessive horizontal force is applied due to a large earthquake or strong wind. When acting, even in a rigid frame structure having a rigid connection structure, a displacement occurs at a joint portion between the joined two members. Then, a large frictional resistance is generated due to the displacement, and the vibrational energy due to the above-mentioned earthquake or wind is consumed by the frictional resistance, and the vibration control function of the building frame is exhibited.

FIG. 14 shows an example of a vibration damping structure provided at a bolt joint. This structure comprises a pair of skins 1, 1 belonging to one of the steel members to be joined together.
1a (press-contact plate), an intermediate plate 2 (press-contact plate) integrally projecting from the other steel member is sandwiched between the outer plates 1 and 1a.
Further, a bolt 3 is passed through the middle plate 2 and fastened by a nut 3a. The bolt insertion hole 4 of the middle plate 2 is formed as a long hole, and relative movement between the outer plates 1 and 1a and the middle plate 2 is allowed. When the building vibrates due to an earthquake, wind, or the like, an excessive tensile force or compressive force is input between the steel members, and a relative displacement P occurs between the outer plates 1 and 1a and the intermediate plate 2, the outer plate and the intermediate plate And a frictional resistance is generated between them, and the frictional resistance controls the entire building frame. The frictional resistance R generated at this time is determined by the axial force N of the bolt 3 and
The product of the friction coefficient of the contact surface between the outer plates 1 and 1a and the intermediate plate 2, R
= Μ · N. The axial force N of the bolt 3 is determined by the tightening force of the nut 3a, and the friction coefficient μ is determined by the surface roughness of the contact surface between the outer plates 1 and 1a and the intermediate plate 2.

[0004]

However, the outer plates 1, 1a
It is extremely difficult to adjust the frictional resistance between the shaft and the intermediate plate 2 simply by the tightening force of the nut 3a. That is, the tightening force is greatly affected by the delicate turning of the nut 3a, and the axial force N of the bolt 3 changes greatly. Moreover, if the friction between the outer plates 1 and 1a and the intermediate plate 2 is repeated many times, the contact surfaces of the outer plates 1 and 1a and the intermediate plate 2 are worn and worn, and the outer plates 1 and 1a or the intermediate plate 2 are worn. The thickness of No. 2 is reduced. For this reason, the nut may be loosened and the axial force N of the bolt 3 may decrease.

[0005] Therefore, a washer and a spring member are mounted on the bolt 3 in an overlapping manner, and the outer plates 1, 1 and 1 are resiliently biased by the spring member.
It is conceivable to adopt a configuration in which the tightening of the nut 3a is hardly loosened even if a or the middle plate 2 is worn.

[0006] However, the following problem occurs when an additional spring member is provided. That is, there is some dimensional allowance between the spring member and the bolt, and the assemblability of the spring member is poor. This dimensional allowance is for easily inserting the bolt shaft into the center hole of the spring member. In particular, when the spring member is formed of a disc spring laminate obtained by laminating a plurality of disc spring members, if the stacked disc spring members are displaced from each other, the bolt tip is caught and it is difficult to penetrate. , Have sufficient dimensional allowance. Due to this dimensional allowance, it is difficult to assemble the spring member at a predetermined position on the outer plates 1 and 1a, the bolt and the spring member are not coaxially arranged, and the load from the bolt may not be transmitted to the spring member in a well-balanced manner. there were.
For this reason, sufficient frictional resistance was not generated between the outer plates 1 and 1a and the middle plate 2, and the case where the originally expected vibration damping performance could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a vibration damper for a bolted joint in which a spring member can be easily assembled at a predetermined position in relation to a bolt or a pressure contact plate. It is to provide a structure.

[0008]

In order to achieve this object, in a first vibration damping structure for a bolted joint according to the present invention, pressure contact plates belonging to two steel members to be joined to each other, respectively. Are overlapped with each other, a bolt is penetrated between the two pressure contact plates, and a washer and a spring member surrounding the outer periphery of the shaft of the bolt are provided between the head of the bolt or a nut mounted on the bolt and the pressure contact plate. Interposed, while applying a bolt axial force between the two pressure contact plates via these washers and spring members, enabling relative movement between the two pressure contact plates, when relative displacement occurs between the two pressure contact plates, It is a vibration damping structure of a bolted joint portion that generates a frictional resistance between the two pressure contact plates and controls the vibration between the two steel members by the frictional resistance. The washer includes the bolt and the bolt. With the spring member Tubular portion to fill between is characterized by being provided integrally (claim 1).

In the vibration damping structure of the bolt joint,
Since the cylindrical portion provided on the washer is interposed to fill the gap between the bolt and the spring member, the position between the spring member and the bolt is positioned, and the work of assembling the spring member coaxially with the bolt is easy. become. It is possible to prevent the load from the bolt from being imbalancedly transmitted to the spring member, and it is possible to solve the problem that the originally planned axial force of the bolt and, consequently, the vibration suppression performance cannot be obtained. Moreover, in this case, since the cylindrical portion is provided integrally with the washer, the time and effort for mounting parts and the like are not increased, and the operation can be easily performed.

Further, in the vibration damping structure of the bolt joint, the through hole of the bolt formed in the pressure contact plate is formed to be larger than the outer diameter of the cylinder to surround the outer periphery of the cylinder. Claim 2). If the bolt through hole is formed so as to surround the outer periphery of the cylindrical portion, the cylindrical portion of the washer can be fitted into the bolt through hole and the washer can be assembled to the press-contact plate, thereby further improving workability.

In the vibration damping structure for a second bolt joint according to the present invention, the press contact plates belonging to the two steel members to be joined to each other are overlapped with each other, and between the two press contact plates. A washer and a spring member that penetrates the bolt and that surrounds the outer periphery of the bolt shaft are interposed between the head of the bolt or a nut attached to the bolt and the press-contact plate, and the washer and the spring member are interposed. Along with applying a bolt axial force between the two pressure contact plates, the relative displacement between the two pressure contact plates is enabled, and when a relative displacement occurs between the two pressure contact plates, a frictional resistance force is generated between the two pressure contact plates. In the vibration damping structure of the bolt joint portion, which damps the two steel members by the frictional resistance, the surface of the pressure contact plate on which the spring member is in close contact is provided with the spring member. Front to surround the perimeter Characterized in that larger formed fitting recess than the outer diameter of the spring member is provided (claim 3).

In the vibration damping structure of the bolt joint,
By surrounding the outer periphery of the spring member with a fitting recess formed on the surface of the pressure contact plate to which the spring member is in close contact, the spring member can be positioned relative to the pressure contact plate, and the spring member and the bolt can be easily coaxially positioned. Can be arranged. It is possible to prevent the tightening of the bolt from being imbalancedly transmitted to the spring member, and to solve a problem that the originally planned bolt axial force and, consequently, the vibration suppression performance cannot be obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vibration damping structure for a bolt joint according to the present invention will be described with reference to the accompanying drawings. Note that the same components as those of the related art are denoted by the same reference numerals.

FIGS. 1 to 3 show an embodiment of a vibration damping structure for a bolt joint according to the present invention. This vibration damping structure is applied to a joint between two steel members 10, 11 interposed to form a brace inside a building frame. The two steel members 10, 11 are both H-section steel,
At predetermined intervals, they are arranged with their ends facing each other. Between the opposed webs 10a, 11a of these two steel members 10, 11 and the flange 10
A vibration damping structure for a bolted joint according to the present invention is interposed as a friction damper 12 between these b and 11b.

The friction damper 12 includes webs 10a, 11
A pair of splice plates 14 are provided on both the front and back sides between the flanges 10b and 11b. Each splice plate 14 is attached to one of the two steel members 10 and 11 (here, the steel member 11) via a friction plate 15 and a sliding plate 16 so as to be relatively movable, and the other steel member (steel member). 10) is integrally fixed and attached via a scissor plate 17. Here, the splice plate 14 is one of the two press contact plates according to the present invention,
The web 11a and the flange 11b of the steel frame member 11 constitute the other pressure contact plate according to the present invention.

The friction plate 15 is made of, for example, a fiber material such as aramid fiber, glass fiber, vinylon fiber, carbon fiber or asbestos using a thermosetting resin as a binder, a friction adjusting material such as cashew dust or lead, and a sulfuric acid value. Formed of a friction material comprising a filler or the like. The friction plate 15 is integrally fixed to and attached to the steel frame member 11, and generates a frictional resistance between the friction plate 15 and the sliding plate 16. On the other hand, the sliding plate 16 is formed of a thin metal plate such as a stainless steel plate, is integrally attached to the splice plate 14 side, and generates frictional resistance while rubbing against the friction plate 15. The scissor plate 17 is provided with these friction plates 15.
And a plate material arranged as a spacer to fill a gap created by interposing the sliding plate 16, and the friction plate 1
5 and the sliding plate 16 are formed to have a thickness corresponding to the total thickness of both.

The splice plates 14 are attached to the steel members 10 and 11 by high-strength bolts 20 and 21, respectively. A bolt insertion hole 18 formed in the steel frame member 11 to which the splice plate 14 is fixed is a normal circular hole 18, while a bolt insertion hole formed in the steel frame member 11 that is relatively movable with respect to the splice plate 14. An elongated hole 19 is formed, and relative movement between the splice plate 14 and the steel frame member 11 is allowed by the elongated hole 19. A cylindrical spring member 22 formed by stacking a plurality of disc spring members 23 is provided between the splice plate 14 and the bolt head 20 a on the outer periphery of the bolt 20 inserted into the elongated hole 19. And two washers (washers) 24 and 26, a nut 28 and a washer 30 are attached to the tip of the bolt 20, and the steel member 1
A predetermined bolt axial force N is applied by sandwiching the web 11a or flange 11b and the splice plates 14 on both sides thereof from both sides.

When the whole building shakes due to an earthquake, wind, or the like, and a relative displacement occurs between these two steel members 10, 11,
Splice plate 1 fixed to one steel member 10
4 moves relative to the other steel member 11. Due to this relative movement, a frictional resistance force is generated between the friction plate 15 and the sliding plate 16, thereby consuming vibration energy.
The building is damped.

In the present embodiment, a washer 24 is used as a washer 24 in order to prevent a displacement between a bolt 20 inserted into the elongated hole 19 and a spring member 22 mounted on the outer periphery of the bolt 20 as shown in FIG. Is used. The washer 24 has a cylindrical portion 24a formed in a hollow cylindrical shape, and a flange portion 24b formed on the upper end of the cylindrical portion 24a so as to project radially outward. The flange portion 24b is interposed between the end of the spring member 22 and the bolt head 20a, and uniformly transmits the load from the bolt head 20a to the spring member 22. The diameter of the flange portion 24b is appropriately set according to the size of the spring member 22.

On the other hand, the upper end of the cylindrical portion 24a is joined to the inner edge of the flange portion 24b, and the center hole 2
4c. The tubular portion 24a is interposed between the spring member 22 and the bolt shaft portion 20b, and functions as a spacer for preventing a displacement between the spring member 22 and the bolt shaft portion 20b. For this reason, the inner diameter of the cylindrical portion 24a is set slightly larger than the outer diameter thereof in accordance with the size of the bolt shaft portion 20b, and the outer diameter thereof corresponds to the size of the cylindrical spring member 22. Thus, it is set slightly smaller than its inner diameter. The length of the cylindrical portion 24a is
2 is set slightly smaller than the length when compressed. This is because the spring member 2 is used to apply a predetermined bolt axial force.
This is to prevent the cylindrical portion 24a from coming into contact with the surface of the splice plate 14 when the compression member 2 is compressed and the spring member 22 cannot be further reduced. The washer 24 integrally formed with such a tubular portion 24a is formed of a material that is not easily damaged by a tightening force applied to the bolt 20 or a compressive force applied to the spring member 22, such as a steel material.

As a method of assembling the spring member 22 and the bolt 20 using the washer 24 with the cylindrical portion 24a, there are the following methods (1) to (3). (1) First, the spring member 22 is connected to the cylindrical portion 24a of the washer 24.
The bolt 20 is inserted into the center hole 24c of the cylindrical portion 24a of the washer 24, and the assembly of the spring member 22, the washer 24 and the bolt 20 is assembled into a predetermined bolt insertion hole. (2) First, the center hole 24c of the cylindrical portion 24a of the washer 24
Into the bolt 20 and a washer 2 around the bolt 20
After mounting 4, the spring member 22 is mounted on the outer periphery of the cylindrical portion 24a of the washer 24, and the assembly of the spring member 22, the washer 24 and the bolt 20 is assembled into a predetermined bolt insertion hole. (3) The spring member 22 is provided on the outer periphery of the cylindrical portion 24a of the washer 24.
After being placed around a predetermined bolt insertion hole in a state where is attached, the bolt 20 is inserted through both the center hole 24c of the cylindrical portion 24a of the washer 24 and the bolt insertion hole.

In any of these methods, the cylindrical portion 24a of the washer 24 is interposed between the spring member 22 and the bolt 20, and they can be assembled with almost no gap therebetween. Thereby, the spring member 22 can be easily assembled coaxially with the bolt 20,
It is possible to prevent the tightening of the bolt 20 from being transmitted imbalance to the spring member 22. Bolt axial force originally planned,
As a result, it is possible to solve the problem that the vibration damping performance cannot be obtained. In addition, since the cylindrical portion 24a is provided integrally with the washer 24, there is no need to increase the time and effort for mounting components as compared with the conventional case. Also, as in the present embodiment,
Even if the spring member 22 is a disc spring laminate in which a plurality of disc spring members 23 are stacked, the washer 2
Since the fourth cylindrical portion 24a is interposed, even if there is a deviation between the disc spring members, the tip of the bolt 20 does not get caught and the bolt 20 can be inserted smoothly. From these facts, the attachment of each part is improved, and the work can proceed smoothly.

When the spring member 22 is mounted on the nut 28 which is mounted on the bolt 20, the washer 30 provided between the nut 28 and the spring member 22 is mounted as shown in FIG. The shape of the washer 24 is as shown in FIG.

=== Other Embodiments (1) === FIG. 6 shows another embodiment of a vibration damping structure for a bolted joint according to the present invention. In this embodiment, the structure is basically the same as that of the above embodiment, but differs in the following points. That is, the splice plate 14
Is formed larger than the outer diameter of the cylindrical portion 24a so as to surround and accommodate the outer periphery of the lower end of the cylindrical portion 24a. When the cylindrical portion 24 a is fitted into the bolt through hole 32, the washer 24 can be positioned on the splice plate 14. Than this,
The workability is improved, and the assembly accuracy of the spring member 22 is also improved, so that the load from the bolt 20 can be transmitted to the spring member 22 in a well-balanced manner.

FIG. 7 shows a vibration damping structure for a second bolt joint according to the present invention. In this damping structure,
Instead of interposing the washer 24 having the above-described shape between the spring member 22 and the bolt shaft portion 20b, the outer periphery of the lower end portion of the spring member 22 is provided on the surface of the splice plate 14 to which the spring member 22 adheres. A fitting recess 34 is provided to surround and house. The fitting recess 34 is formed by notching an opening peripheral portion of the bolt through-hole 33 of the splice plate 14 along the circumferential direction in an annular manner, and expanding the opening of the bolt through-hole 33. Note that a normal washer 25 is interposed between the spring member 22 and the bolt 20. The fitting recess 34 is formed corresponding to the outer diameter of the spring member 22. When the spring member 22 is fitted into the fitting recess 34, the spring member 22 is positioned with respect to the fitting recess 34, that is, on the splice plate 14. As a result, the assemblability of the spring member 22 is improved, and the spring member 22 and the bolt 20 can be easily arranged coaxially. As a result, the load from the bolt 20 is not transmitted to the spring member 22 in an unbalanced manner, and there is no problem that the originally planned bolt axial force and, consequently, the vibration suppression performance cannot be obtained.

The fitting recess 34 may be formed on the surface of the splice plate 14 as, for example, an annular groove as long as the position between the spring member 22 and the splice plate 14 can be determined.

=== Application Example === FIGS. 8 to 12 show another application example of the vibration damping structure of the bolt joint. FIG. 8 shows two steel members 1
Between the webs 10a, 11a of 0, 11 or the flange 10
The case where the splice plate 14 is arranged only on one side between b and 11b is shown. Also in this embodiment, as in the above case, the splice plate 14 is integrally fixed to one steel frame member 10 with bolts 21 and formed on the other steel frame member 11 on the steel frame member 11. It is attached with a bolt 20 so as to be relatively movable through a long hole 19.

FIG. 9 shows a plurality of splice plates 14a, 14b, on both sides of the two steel members 10, 11 between the webs 10a, 11a or between the flanges 10b, 11b.
14C shows a case where the layers 14c are stacked and disposed. Inner plates 14a are disposed on both sides of the webs 10a, 11a and the flanges 10b, 11b of the steel members 10, 11, and outer plates 14b are further laminated outside the inner plates 14a. . Further, between the webs 10a and 11a or the flange 1
An intermediate plate 14c is disposed between the inner plates 14a between the inner plates 14a and 0b and 11b. Inner plate 1
4a is attached to each of the steel members 10, 11 one by one on both sides. The outer plate 14b is provided between the two inner plates 14a so as to extend from the outside, and connects the inner plates 14a. The middle plate 14c connects the inside plates 14a to each other from inside.

The plates 14a, 14b, 14c are connected by bolts 20, 21. Of these, the bolt 20 that couples the outer plate 14b and the inner plate 14a of the steel member 11 on the right side of the drawing is the inner plate 14
a into the elongated hole 19 formed in the outer plate 14.
b and the inner plate 14a adjacent thereto are relatively movable with respect to each other. Other plates 14a, 1
4b and 14c are all integrally fixed. A scissor plate 17 is interposed between the plates 14a, 14b, and 14c fixed to each other, and a friction plate 15 and a sliding plate 16 are provided between the plates 14a, 14b, and 14c that are movably joined to each other. It is interposed.

FIG. 10 shows a case in which one of the two outermost outer plates 14b is removed and only one side is removed in the vibration damping structure of the bolted joint shown in FIG.

FIG. 11 shows the vibration damping structure of the bolted joint shown in FIGS. 1 to 3, which is provided between the webs 10a, 11a or between the flanges 10b, 11b of the two steel members 10, 11. Two splice plates 14,
The splice plate 14d on one side of the 14d has a larger thickness. Thus, splice plate 1
By increasing the thickness of 4d, the tightening force of bolt 20 can be transmitted well to splice plate 14d without washer 30, and washer 30 can be omitted.

FIG. 12 shows a further development of FIG.
This shows a case where the thicknesses of the splice plates 14d on both the front and back sides between the webs 10a, 11a or between the flanges 10b, 11b of the two steel members 10, 11 are made thick. If the thicknesses of the splice plates 14d on both the front and back sides are increased in this way, the webs 10a, 11
a or between the flanges 10b and 11b is further stiffened.

FIG. 13 shows a case in which the size of the head 20a of the bolt 20 is increased and a washer attached to the head 20a is omitted. The tightening force of the bolt 20 is reduced by the amount of the increase in the size of the bolt head 20a.
Can be transmitted well. In this case, the spring member 2
2 and the washer 24 are mounted on the nut 28 side. The shape of the bolt head 20a is not limited to a hexagonal shape, and may be formed in other shapes such as a rectangular shape.

=== Other Application Examples === (1) The vibration damping structure of the bolt joint according to the present embodiment is applicable to various types of brace structures such as Y type, K type, W type and X type. Can be applied. Further, the vibration damping structure of the bolted joint according to the present invention is not limited to the case where the present invention is applied to such a brace structure, as long as it is between two steel frame members such as steel columns and steel beams constituting a building frame. Can be applied anywhere. (2) Steel members to which the present invention is applied include an I-beam, an angle steel, a channel steel, a flat steel, a steel pipe, and the like, in addition to the H-beam described in the above embodiment. (3) The pressure contact plate according to the present invention is not limited to the splice plate or the web or flange of the steel member described in the above embodiment. (4) In the above embodiment, the friction plate and the sliding plate are interposed between the steel frame member and the splice plate (pressure contact plate). However, in the present invention, it is not particularly necessary to interpose these. In addition, a structure in which other members other than the friction plate and the sliding plate are interposed may be used.

[0035]

According to the vibration damping structure of the first bolted joint according to the present invention, a bolt penetrating between two pressure contact plates belonging to two steel members is mounted together with a spring member together with a spring member. The washer that applies a bolt axial force to the washer is integrally provided with a tubular portion interposed between the bolt and the spring member, so that the assemblability of the spring member is improved, And the bolt can be easily coaxially arranged, and the load from the bolt can be transmitted to the spring member in a well-balanced manner, ensuring a sufficient bolt axial force and obtaining the originally intended vibration damping performance. . Moreover, the operation of attaching the spring member is simplified, the operation time is shortened, and the cost can be reduced as a whole (claim 1).

Further, the through hole of the bolt formed in the pressure contact plate is formed to be larger than the outer diameter of the cylindrical portion so as to surround the outer periphery of the cylindrical portion, so that the cylindrical portion is fitted into the bolt through hole, The washer can be assembled to the pressure contact plate, and the workability is further improved (claim 2).

Further, according to the second vibration damping structure of the bolt joint portion according to the present invention, the spring member is fitted into a fitting recess formed on the surface of the press-contact plate to which the spring member is brought into close contact. Since it is possible to position between the press contact plate, the assembling property is good, the spring member and the bolt can be easily arranged coaxially, the load from the bolt is transmitted to the spring member in a well-balanced manner, and sufficient It is possible to secure the bolt axial force and obtain the vibration damping performance originally planned (claim 3).

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing an embodiment in which a vibration damping structure of a first bolt joint according to the present invention is applied to a brace.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 showing a main part of the vibration damping structure of the bolted joint in FIG. 1;

FIG. 3 is a plan view showing a main part of a vibration damping structure of a bolt joint of FIG. 1;

FIG. 4 is a perspective view showing an embodiment of a washer applied to a vibration damping structure of a first bolt joint according to the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the vibration damping structure of the first bolted joint according to the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the vibration damping structure of the first bolted joint according to the present invention.

FIG. 7 is a cross-sectional view showing an embodiment of a vibration damping structure for a second bolt joint according to the present invention.

FIG. 8 is a cross-sectional view showing an application example of a vibration damping structure for a bolt joint according to the present invention.

FIG. 9 is a cross-sectional view showing an application example of a vibration damping structure for a bolt joint according to the present invention.

FIG. 10 is a cross-sectional view showing an application example of a vibration damping structure for a bolted joint according to the present invention.

FIG. 11 is a cross-sectional view showing an application example of a vibration damping structure for a bolt joint according to the present invention.

FIG. 12 is a cross-sectional view showing an application example of a vibration damping structure for a bolt joint according to the present invention.

FIG. 13 is a cross-sectional view showing an application example of a vibration damping structure for a bolt joint according to the present invention.

FIG. 14 is a cross-sectional view showing an example of a conventional vibration damping structure for a bolted joint.

[Explanation of symbols]

 10, 11 Steel member 10a, 11a Web 10b, 11b Flange 12 Friction damper 14 Splice plate 19 Long hole 20 Bolt 22 Spring member 24 Washer 28 Nut 32 Bolt insertion hole 34 Fitting recess

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16F 15/02 F16F 15/02 E (72) Inventor Yasunari Hino 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Yasuhiko Takahashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd.Obayashi Gumi Technical Research Institute, Inc. (72) Inventor Yasumasa Suzui 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. F-term (reference) 2E001 DG01 EA06 FA01 FA02 HD12 JA22 JA29 JD05 LA01 MA15 2E125 AA04 AA14 AB01 AC15 AG03 AG12 BB02 BB22 CA06 EA25 EB02 EB06 3J034 AA05 BA08 BB05 CA03 3J048 AA01 AB01 AC01 BC05 EA07

Claims (3)

[Claims] 1. A pressure contact plate belonging to each of two steel members to be joined to each other is overlapped with each other, a bolt is penetrated between both pressure contact plates, and a head of the bolt or a nut mounted on the head is attached to the bolt. A washer and a spring member surrounding the outer periphery of the shaft of the bolt are interposed between the pressure contact plate and a bolt axial force is applied between the two pressure contact plates via the washer and the spring member. The relative displacement of the two, and when a relative displacement occurs between the two pressure contact plates,
It is a vibration damping structure of a bolted joint in which a frictional resistance is generated between the two pressure contact plates and the two steel members are damped by the frictional resistance. The washer includes the bolt and the bolt. A vibration damping structure for a bolted joint, wherein a cylindrical portion is integrally provided to fill a gap with the spring member. 2. The bolt according to claim 1, wherein a through-hole of the bolt formed in the press-contact plate is formed to be larger than an outer diameter of the cylindrical portion so as to surround an outer periphery of the cylindrical portion.
The vibration damping structure of the bolt joint described in the above. 3. The pressure contact plates belonging to two steel members to be joined to each other are overlapped with each other, a bolt is penetrated between the two pressure contact plates, and a head of the bolt or a nut mounted on the head is attached to the bolt. A washer and a spring member surrounding the outer periphery of the shaft of the bolt are interposed between the pressure contact plate and a bolt axial force is applied between the two pressure contact plates via the washer and the spring member. The relative displacement of the two, and when a relative displacement occurs between the two pressure contact plates,
A vibration damping structure for a bolted joint in which a frictional resistance is generated between the two pressure contact plates and the two steel members are damped by the frictional resistance. The surface of the pressure contact plate is provided with a fitting recess formed to be larger than the outer diameter of the spring member so as to surround the outer periphery of the spring member. Swing structure.