JP4648786B2 - Friction damper device and installation method thereof - Google Patents

Description

  The present invention relates to a seismic isolation structure of a building, and more particularly to a friction damper device using a frictional force acting between a sliding material and a friction material and a method for installing the friction damper device.

Conventionally, as a damping device for seismic isolation structures and damping structures, there is a friction damper device using a frictional force acting on a friction surface between a sliding material and a friction material. The structure of the friction damper device is such that a compression force (pressing force) is introduced into the friction material by tightening a bolt using a disc spring to generate friction on the friction surface. According to this, the vibration force applied to the building can be attenuated by absorbing the seismic energy by the frictional force between the two.
A friction damper device using such a disc spring is disclosed in Patent Document 1, for example.
In the friction damper device shown in Patent Document 1, a sliding material is sandwiched between friction materials from both sides, and is further sandwiched between flange plates from the outside. Further, a disc spring and a washer are provided outside the flange plate and penetrated by bolts. The structure is tightened with nuts. The disc spring is compressed by the compression force introduced by the tightening force between the bolt and the nut. The sliding material is formed with a long hole so as to be able to cope with the sliding deformation that occurs in the axial direction of the penetrated bolt.
JP 2005-121041 A

However, in Patent Document 1 and the conventional friction damper device, when the friction damper device is installed in a building, it is important to manage the compression force of the friction material to be constant. For this reason, when tightening the bolt, the work of securing a predetermined compressive force by measuring the strain of the bolt is performed, and there is a problem that it takes time and effort in the installation work.
Moreover, in the structure of the friction damper device in Patent Document 1, it is necessary to form a long hole for penetrating a bolt in the sliding material in a size that matches the amount of deformation at the time of an earthquake, and there is a drawback that it takes time and effort for processing. there were.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a friction damper device and a method of installing the friction damper device that can reduce the labor and time of installation and the processing of members.

In order to achieve the above object, a friction damper device according to the present invention is a friction damper device including a sliding material provided in a building and a friction material provided on a foundation of the building and sandwiching the sliding material, A pair of support members that are sandwiched and supported, a tightening bolt that is inserted through the pair of support members and screwed into a nut, a washer provided inside the head of the tightening bolt and inside the nut, and spring rigidity comprising an elastic member provided on the clamping bolt and coaxially between the support member and the washer have, the abutting member for abutting a pair of washers which are clamped I by the clamping bolt and the nut, the contact member A compression force is applied to the elastic member by each of the pair of washers in contact with each other, and the compression force of the friction material is made constant .
In the present invention, the elastic member can be bent by tightening the nut to the tightening bolt, and the compressive force can be applied to the friction material via the support member. The washer abuts against the abutting member when it is pushed to a predetermined position by tightening the nut. The applied compressive force can apply the compressive force to the friction material via the elastic member until the washer contacts the contact member, and can cause friction between the friction material and the sliding material. Further, the compressive force after the washer abuts against the abutment member is borne by the abutment member, the deflection applied to the elastic member and the pressurization to the friction material are stopped, and the frictional force becomes constant. Thus, the contact member can regulate the compressive force acting on the friction material and the sliding material so as not to exceed a predetermined friction force.

In the friction damper device according to the present invention, it is preferable that the contact member is a cylindrical member in which a fastening bolt is inserted coaxially.
In the present invention, since the tightening bolt, the washer, the elastic member, and the cylindrical member are provided coaxially, the direction of the applied compressive force is also coaxial, so that the cylindrical member that contacts the nut with a predetermined fastening length is provided. The length in the axial direction can be set.

In the friction damper device according to the present invention, it is preferable that the tightening bolts are arranged on both sides with respect to the axial direction of the sliding material.
In the present invention, since the tightening bolt is not passed through the sliding material, it is not necessary to make a long hole in the sliding material as in the prior art, and processing work can be saved.

The friction damper device installation method according to the present invention is a friction damper device installation method comprising a sliding material provided in a building and a friction material provided on the foundation of the building and sandwiching the sliding material. Are clamped between a pair of support members, a tightening bolt is inserted through the pair of support members and a nut is screwed together, and a washer is provided inside the head of the tightening bolt and inside the nut, and the tightening bolt between the support member and the washer An elastic member having spring rigidity is installed coaxially with the bolt, and the tightening bolt and nut are tightened with a predetermined tightening length to bring the washer into contact with the contact member, thereby compressing the elastic member and reducing the compression force of the friction material. It is characterized by being constant .
In the present invention, a predetermined compressive force can be applied to the friction material when the nut is tightened and the washer contacts the contact member. Since the nut cannot be tightened any more when it comes into contact, the tightening operation can be completed. By managing the tightening of the nut in this way, it is not necessary to measure the strain of the bolt as in the prior art, and such troublesome work can be reduced.

  According to the friction damper device and the installation method of the present invention, when the friction damper device is installed, the compression length of the friction material can be made constant by managing the tightening length by the tightening bolt and the nut by the contact member. it can. For this reason, it is not necessary to perform bolt strain measurement as in the prior art, and such troublesome work can be reduced.

Hereinafter, a friction damper device and an installation method thereof according to an embodiment of the present invention will be described with reference to FIGS.
1 is a plan view showing a friction damper device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the friction damper device shown in FIG. 1, taken along line AA, and FIG. These are figures which show the state which the sliding material in the friction damper apparatus by this Embodiment displaced in the XY direction.

As shown in FIG. 1, a friction damper device 1 according to the present embodiment is connected between a building 2 such as a steel material provided on an upper portion of a building foundation slab, for example.
As shown in FIG. 2, the friction damper device 1 includes a sliding member 3 extending horizontally in the middle of the foundations 2 and 2 arranged in parallel at a predetermined interval, and the sliding member 3 vertically at a predetermined position. A pair of friction materials 4A and 4B to be sandwiched from the direction, an upper steel plate 5A (support member) and a lower steel plate 5B (support member) sandwiched from the outside of the friction materials 4A and 4B, and the axial direction of the sliding material 3 On the other hand, the upper and lower steel plates 5A and 5B are penetrated by fastening bolts 6 at two locations on both sides, and are roughly constituted by fastening means 7 for fastening them to each other.
As shown in FIG. 1, the sliding material 3 has both ends 3a and 3a joined to a building (not shown).

As shown in FIG. 1, the upper steel plate 5 </ b> A and the lower steel plate 5 </ b> B have, for example, different rectangular shapes, and the longitudinal direction is arranged in a direction orthogonal to the sliding material 3. The lower steel plate 5B is disposed so as to bridge both the foundations 2 and 2, and is fixed to the foundations 2 and 2 by a plurality of bolts 8 (see FIG. 2).
The upper steel plate 5 </ b> A is extended so that both end portions 5 c and 5 c in the longitudinal direction cover the upper sides of the foundations 2 and 2. And each edge part 5c, 5c is clamped by the two pressing members 9 which make L shape so that it may not move to the axial direction of the sliding material 3. FIG. As shown in FIG. 3, the pressing member 9 has one end surface 9a abutted against the side surface 5d of the upper steel plate 5A and the other end surface 9b fixed to the lower steel plate 5B with the second bolt 10.

  As shown in FIG. 2, the upper steel plate 5A is formed with circular holes 5a, 5a penetrating with a diameter larger than the diameter of the fastening bolts 6, 6 at predetermined positions on both sides with respect to the axial direction of the sliding material 3. Yes. The lower steel plate 5B is also formed with circular holes 5b and 5b having the same diameter so as to be coaxial with the circular holes 5a and 5a.

Next, the configuration of the tightening means 7 will be described. As shown in FIG. 2, cylindrical members 12 and 12 (contact members) made of steel pipes or the like having a predetermined length are inserted into the circular holes 5a and 5b of the upper and lower steel plates 5A and 5B.
Here, the predetermined positions where the circular holes 5a and 5b are formed are such that the pair of inserted cylindrical members 12 and 12 are substantially in contact with the sliding member 3 positioned therebetween, and are shown in FIG. In this way, the predetermined interval L is set.

As shown in FIGS. 2 and 3, a disc spring 13A (elastic member) and an upper washer 14A are arranged in series in the order above the upper steel plate 5A so as to be coaxial with the circular holes 5a and 5b described above. Has been. On the other hand, below the lower steel plate 5B, a disc spring 13B (elastic member) and a lower washer 14B are arranged in series coaxially with the circular hole 5b.
The disc springs 13A and 13B are formed by coaxially overlapping a plurality of disc springs, and circular holes 13a and 13a having an inner diameter through which the cylindrical member 12 can be inserted are formed in the center in plan view. The upper and lower washers 14A and 14B are formed with a hole having the same diameter as the tightening bolt 6 in the center, and have an area larger than the outer shape of the disc springs 13A and 13B in plan view.

Further, the cylindrical member 12 is not fixed to the upper and lower steel plates 5A and 5B and the disc springs 13A and 13B but is placed on the lower washer 14B (see FIG. 2).
As shown in FIG. 2, the tightening bolt 6 is inserted from below the lower washer 14B, and the nut 11 is screwed above the upper washer 14A.
FIG. 2 shows a state before the nut 11 is tightened to the tightening bolt 6.

The cylindrical member 12 shown in FIG. 2 is made of a material whose rigidity in the axial direction is larger than the spring rigidity of the disc springs 13A and 13B.
The length D1 of the cylindrical member 12 is determined from the total thickness D2 of the sliding material 3, the friction materials 4A and 4B, the upper and lower steel plates 5A and 5B, and the disc springs 13A and 13B in an unloaded state. 11 is set by the length obtained by subtracting the fastening length D3. The tightening length D3 can be calculated from the compression force required for the friction materials 4A and 4B to press the sliding material 3, that is, the spring rigidity of the disc springs 13A and 13B.

Next, the operation of the friction damper device 1 having such a configuration will be described with reference to the drawings.
First, as shown in FIG. 2, the friction damper device 1 is assembled in the above-described configuration. When the nut 11 is tightened to the tightening bolt 6 using a torque wrench or the like, the upper and lower washers 14A and 14B are pushed toward each other, and the disc springs 13A and 13B are compressed to cause deflection.
When the nut 11 is further tightened, the upper washer 14A comes into contact with the upper end 12a of the cylindrical member 12 at a position where the predetermined tightening length D3 is tightened. At this time, the tightening torque of the nut 11 increases, and further tightening cannot be performed.

As shown in FIG. 2, the compression force (pressing force) introduced by the fastening bolt 6 and the nut 11 is changed from the upper and lower washers 14A and 14B to the disc spring 13A until the upper washer 14A comes into contact with the cylindrical member 12. 13B is transmitted to pressurize the friction materials 4A and 4B and cause friction between the friction materials 4A and 4B and the sliding material 3.
Further, the compression force after the upper washer 14A and the upper end 12a of the cylindrical member 12 contact each other is borne by the cylindrical member 12, and the deflection applied to the disc springs 13A and 13B and the pressure applied to the friction material 4 are reduced. The action stops and the frictional force generated between the sliding material 3 and the friction material 4 becomes constant.
Thus, the cylindrical member 12 can regulate the compressive force acting on the friction material 4 and the sliding material 3 so as not to exceed a predetermined friction force.

  Next, as shown in FIG. 2, the horizontal force generated in the longitudinal direction of the foundations 2 and 2 at the time of an earthquake is transmitted from the foundations 2 and 2 through the lower steel plate 5B in the lower friction material 4B. On the other hand, in the upper friction material 4A, it is transmitted from the foundations 2 and 2 to the pressing member 9 via the lower steel plate 5B and further transmitted via the upper steel plate 5A. The sliding member 3 receives the horizontal force from the upper and lower friction members 4A and 4B, but the friction in the axial direction of the sliding member 3 is attenuated.

The friction damper device 1 shown in FIG. 1 according to the present embodiment exhibits a damping force in the axial direction of the sliding material 3 as described above. Therefore, as shown in FIG. 4, it is preferable to install the friction damper device 1 in each of the buildings in the X and Y directions so that the horizontal forces in the X and Y directions generated during the earthquake can be attenuated.
The friction damper device 1 shown in FIG. 4 is installed so that the sliding material 3 slides in the X direction. A direction perpendicular to the X direction on the horizontal plane is defined as Y. For example, when a load is generated in the directions of arrows X1 and Y1 during an earthquake, the sliding material 3 slides in the X1 direction with respect to the load in the X1 direction and is sandwiched between the cylindrical members 12 and 12 with respect to the load in the Y1 direction. Is rotated at a predetermined angle according to the amount of displacement in the Y1 direction.
Therefore, the interval L between the cylindrical members 12 and 12 in the friction damper device 1 in the X direction is designed so that the sliding material 3 can rotate as shown in FIG. 4 when the maximum displacement in the Y direction occurs.

In the friction damper device and the installation method thereof according to this embodiment described above, the compression force of the friction material 4 is made constant by managing the fastening length D3 by the tightening bolt 6 and the nut 11 when the friction damper device 1 is installed. can do. For this reason, it is not necessary to perform bolt strain measurement as in the prior art, and such troublesome work can be reduced.
Further, in the friction damper device and the installation method thereof according to the above-described embodiment, it is not necessary to make a long hole in the sliding material 3 as in the prior art, and the processing labor can be omitted.

Next, a modification of the embodiment of the present invention will be described with reference to FIG. Will be described.
FIG. 5 is a view showing a friction damper device according to a modification of the embodiment.
As shown in FIG. 5, in this modification, the upper and lower washers 14A, 14B are fixed to a predetermined fastening length D3 outside the disc springs 13A, 13B in place of the cylindrical member 12 (see FIG. 2) of the embodiment. The locking member 15 (abutting member) to be brought into contact with is fixed to the upper steel plate 5A and the lower steel plate 5B. Of the locking members 15 fixed to the lower steel plate 5 </ b> B, those that overlap the foundation 2 are fixed to the foundation 2. The upper washer 14A is formed to have a larger diameter than the outer diameter of the disc spring 13A, and the outer peripheral lower surface 14a abuts on the upper surface 15a of the locking member 15, so that the nut has a predetermined tightening length D3 as in the embodiment. 11 can be stopped, and a predetermined frictional force can be applied to the friction members 4A and 4B.

As mentioned above, although embodiment and the modification of the friction damper apparatus by this invention and its installation method were demonstrated, this invention is not limited to said embodiment and modification, In the range which does not deviate from the meaning. It can be changed as appropriate.
For example, in the embodiment and the modification, the size and shape of the upper steel plate 5A and the lower steel plate 5B are not particularly limited. That is, it is sufficient that the frictional force of the friction members 4A and 4B is transmitted from the foundation 2 through the upper and lower steel plates 5A and 5B.
In the embodiment, the cylindrical member 12 through which the tightening bolt 6 is inserted is used. However, the shape and arrangement are not limited to this, and for example, a rectangular tube or a plate shape may be used. . In short, as shown in the modification, it is only necessary that the fastening length D3 of the fastening bolt 6 and the nut 11 can be regulated at a predetermined position.

It is a top view which shows the friction damper apparatus by embodiment of this invention. FIG. 2 is a cross-sectional view of the friction damper device shown in FIG. 1 taken along line AA. It is a BB arrow line view of the friction damper apparatus shown in FIG. It is a figure which shows the state which the sliding material in the friction damper apparatus by this Embodiment displaced in the XY direction. It is a figure which shows the friction damper apparatus by the modification of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Friction damper apparatus 2 Foundation 3 Sliding material 4, 4A, 4B Friction material 5A Upper steel plate (support member)
5B Lower steel plate (support member)
6 Tightening bolt 7 Tightening means 9 Holding member 11 Nut 12 Cylindrical member (contact member)
13A, 13B Disc spring (elastic member)
14A Upper washer 14B Lower washer 15 Locking member (contact member)

Claims (4)

A friction damper device comprising a sliding material provided in a building and a friction material provided on a foundation of the building and sandwiching the sliding material,
A pair of support members that sandwich and support the friction material;
A clamping bolt inserted through the pair of support members and screwed into a nut;
A washer provided inside the head of the clamping bolt and inside the nut;
An elastic member having spring rigidity and provided coaxially with the clamping bolt between the support member and the washer;
And the abutment member for abutting a pair of said washer clamped I by the clamping bolt and the nut,
Equipped with a,
A friction damper device characterized in that a compression force is applied to the elastic member by each of the pair of washers in contact with the contact member, and the compression force of the friction material is made constant . The friction damper device according to claim 1, wherein the contact member is a cylindrical member through which the fastening bolt is coaxially inserted. The friction damper device according to claim 1, wherein the tightening bolts are disposed on both sides with respect to the axial direction of the sliding material. A friction damper device installation method comprising a sliding material provided in a building and a friction material provided on a foundation of the building and sandwiching the sliding material,
The friction material is sandwiched between a pair of support members, a tightening bolt is inserted into the pair of support members and a nut is screwed, and a washer is provided inside the head of the tightening bolt and inside the nut, and the support member And an elastic member having spring rigidity coaxially with the fastening bolt between the washers,
Wherein the fastening bolt and the nut that is brought into contact with the abutment member said washer is tightened with a predetermined tightening length, wherein compressing the elastic member, the compressive force of the friction member is set to be constant The installation method of the friction damper apparatus characterized by this.

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