JP2023142941A - Buffer material - Google Patents

Abstract

To provide a buffer material capable of simplifying replacement work.SOLUTION: A buffer material 10 is attached to a horizontal movement suppressing member 20 disposed on a bridge pier B with a horizontal gap formed between the buffer material 10 and a bridge girder A. The buffer material 10 has a buffer body 11 in which a plurality of through holes 11c penetrating in the vertical direction are formed, and a plurality of insertion members 12 inserted into the through holes 11c, respectively, a locking member 13 fixed to a part 12a projecting from the upper end of the buffer body 11 of each of the plurality of insertion members 12 and detachably fixed to the horizontal movement suppressing member 20, and a falling-off preventing member 14 fixed to a part 12b projecting from the lower end of the buffer body 11 of each of the plurality of insertion members 12 and preventing each insertion member 12 from falling off from the through hole 11c.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cushioning material, and particularly to a cushioning material that is attached to either one of two heavy objects provided with a horizontal gap between them.

For example, in order to prevent a bridge from collapsing, a horizontal movement suppressing member that suppresses horizontal movement of a bridge girder is sometimes attached to a bridge pier. In this case, a cushioning material is attached to the horizontal movement suppressing member in order to suppress the impact when the bridge girder and the horizontal movement suppressing member collide.

Generally, a stepped through hole is formed on the surface of the shock absorber facing the bridge girder in a direction perpendicular to this surface, and a nut is screwed onto a bolt inserted through this through hole. , a cushioning material is installed. However, in this case, the gap between the bridge girder and the horizontal movement suppressing member is within the permissible range for horizontal movement, but is very narrow, so the cushioning material cannot be replaced unless the horizontal movement suppressing member is removed from the bridge pier.

Therefore, in Patent Document 1, a plurality of mounting pieces with upper and lower ends protruding are embedded in a shock absorber so as to be flush with the mounting surface of the shock absorber, and anchors are inserted into through holes formed in each of the protruding ends. It is described that a shock absorber is installed on a bridge fall prevention wall (horizontal movement suppressing member) by inserting a bolt through it.

Patent Document 2 discloses that a bolt is embedded and adhesively fixed in a buffer rubber (buffer), a mounting steel plate is attached to the protruding upper end of the bolt using a nut, and the bolt is inserted into a through hole formed in the mounting steel plate. , it is described that a buffer rubber is installed on a concrete wall (horizontal movement suppressing member) by fixing bolts to the concrete wall.

Patent No. 3599906 JP2012-251411A

In the technique described in Patent Document 1, the mounting piece is coated with an adhesive or the like and placed in a mold and vulcanized, thereby embedding the mounting piece in the mounting surface of the buffer body. On the other hand, in the technique described in Patent Document 2, the bolt is embedded with a resin adhesive and integrated with the cushioning rubber. However, with such a fixing method using an adhesive or the like, the fixed state cannot be maintained well for a long period of time.

In view of the above points, it is an object of the present invention to provide a cushioning material that can be satisfactorily fixed to a heavy member such as a horizontal movement suppressing member for a long period of time.

The cushioning material of the present invention is a cushioning material that is attached to one of two heavy objects having horizontally opposing surfaces with a horizontal gap between the surface of the other heavy object, and A buffer body having a plurality of through holes penetrating in a direction, a plurality of insertion members respectively inserted into the through holes, and each of the plurality of insertion members fixed to a portion protruding from an upper end of the buffer body. a locking member having a locking portion that is removably fixed to the one heavy object, and a locking member having a locking portion that is removably fixed to the one heavy object, and a locking member that is respectively fixed to a portion of the plurality of insertion members protruding from the lower end of the buffer body, and each of the insertion members The device is characterized by comprising a falling-off prevention member that prevents the device from falling out of the through-hole.

According to the cushioning material of the present invention, the locking member is fixed to the upper end of the insertion member, and the falling-off prevention member is fixed to the lower end, so that the insertion member can be prevented from falling off from the cushioning body for a long period of time. This makes it possible to reliably prevent this.

In the cushioning material of the present invention, a male thread is formed in each of the plurality of insertion members protruding from the lower end of the buffer body, and the fall prevention member is fixed to each of the plurality of male threads using a nut. It is preferable.

In this case, it is possible to more effectively prevent deformation of the buffer body, compared to the case where a drop-off prevention member is fixed for each insertion member. In addition, since it is fixed using a nut, the fixing work is simple and the degree of tightening of the shock absorber can be easily adjusted.

Further, in the cushioning material of the present invention, a male thread is formed in each of the portions of the plurality of insertion members protruding from the upper end of the buffer body, and each of the locking members is fixed to the male thread using a nut. It is preferable.

In this case, since the nut is used for fixing, the fixing work is simple and the degree of tightening of the shock absorber can be easily adjusted.

Further, in the cushioning material of the present invention, it is preferable that each of the locking members has a through hole formed therein, and is engaged with the upper part of the one heavy object by an anchor bolt inserted through the through hole.

In this case, the locking member can be easily and detachably fixed to the upper part of one of the heavy objects using the anchor bolt.

Further, in the cushioning material of the present invention, it is preferable that, for example, the one heavy object is a horizontal movement suppressing member disposed on a bridge pier, and the other heavy object is a bridge girder.

Moreover, in the buffer material of the present invention, for example, the horizontal movement suppressing member is a reinforced concrete structure.

FIG. 1 is an explanatory diagram showing a bridge collapse prevention structure using a cushioning material according to an embodiment of the present invention. A schematic vertical cross-sectional view of a bridge collapse prevention structure. FIG. 3 is a schematic side view showing a state in which a cushioning material is attached to a horizontal movement suppressing member.

A horizontal movement suppressing cushioning material 10 (hereinafter simply referred to as cushioning material 10) according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that FIGS. 1 to 3 are diagrams for schematically explaining this embodiment, and the dimensions are deformed.

The buffer material 10 is attached to a horizontal movement suppressing member 20 installed on a bridge pier B for the purpose of seismically isolating a bridge girder A such as a main girder of a bridge such as a viaduct to prevent a bridge collapse. The horizontal movement suppressing member 20 suppresses horizontal movement of the bridge girder A, and the buffer material 10 is installed with a predetermined gap provided between the horizontal movement suppressing member 20 and the bridge girder A.

The horizontal movement suppressing member 20 and the bridge girder A have surfaces S1 and S2 that face each other in the horizontal direction, and the cushioning material 10 is provided between these surfaces S1 and S2, and is in contact with one surface S1 and the other surface. It can be installed with a horizontal gap left between the surface S2 and the surface S2. Thereby, the buffer material 10 suppresses the impact when the bridge girder A and the horizontal movement suppressing member 20 collide. In addition, the horizontal movement suppressing member 20 corresponds to one heavy object of the present invention, and the bridge girder A corresponds to the other heavy object of the present invention.

The horizontal movement suppressing member 20 is made of reinforced concrete with built-in reinforcing bars, and includes a base bracket 21 fixed to the pier B and a buffer material bracket 22 to which the buffer material 10 is attached.

Although not shown, the base bracket 21 is fixed to a large number of anchors using nuts, which are installed in advance on the concrete pier B or are fixed by post-construction.

The cushioning material bracket 22 is provided integrally with the upper surface 21a of the base bracket 21. The cushioning material bracket 22 has a surface S1 against which the cushioning material 10 comes into contact.

The buffer material bracket 22 may be created by, for example, pouring concrete integrally with the base bracket 21. Moreover, the buffer material bracket 22 may be created by first placing concrete up to its upper surface 21a to create the base bracket 21, and then further placing concrete thereon. In this case, the buffer material bracket 22 may be made of concrete cast on site or may be a precast member.

The joint structure between the buffer material bracket 22 and the base bracket 21 can be achieved by, for example, protruding a joint line from the upper surface 21a of the base bracket and fixing it in the buffer material bracket 22. In this case, the joint line may be a post-installed anchor. There may be. Alternatively, a structure may be adopted in which a joining hole is provided that passes through the base bracket 20 and the buffer material bracket 22 in the vertical direction, a PC steel rod or the like is installed, and the top and bottom are fixed with nuts.

The cushioning material 10 includes a cushioning body 11, an insertion member 12, a locking member 13, a falling-off prevention member 14, etc.

The buffer body 11 has a rectangular plane 11a that is in surface contact with the mounting surface S1 of the buffer material bracket 22, and a plane 11b that is parallel to this plane 11a and faces the surface S2 of the bridge girder A with a predetermined gap therebetween. It has a generally rectangular plate shape as a whole.

The buffer body 11 is formed with a plurality of through holes 11c that penetrate in the vertical direction when installed on the horizontal movement suppressing member 20. The buffer body 11 may be the same as a conventional buffer body except that the through hole 11c is formed, and may be made of, for example, rubber.

The insertion members 12 are inserted into through holes 11c formed in the buffer body 11, respectively. The upper end 12a of the insertion member 12 projects upward from the upper end of the buffer body 11, and the lower end 12b of the insertion member 12 projects downward from the lower end of the buffer body 11. The upper end portion 12a and the lower end portion 12b are formed with male threads. Note that as the insertion member 12, a threaded bolt (long threaded bolt) having a male thread formed over its entire length may be used.

The locking member 13 is formed by bending a rectangular piece made of metal such as steel. The locking member 13 removably engages the buffer material 10 with the horizontal movement suppressing member 20, more specifically, on the upper surface of the buffer material bracket 22, with a gap in the horizontal direction between it and the surface S2 of the bridge girder A. It is configured so that it can be stopped.

The locking member 13 has a first piece 13b extending in a horizontal plane and having a through hole 13a through which the upper end 12a of the insertion member 12 is inserted. With the lower surface of this first piece 13b and the upper end surface of the buffer body 11 in contact with each other, the locking member 13 is fixed to the insertion member 12 by the nut 15 screwed onto the upper end 12a of the insertion member 12. There is. In this way, by fixing the first piece 13b of the locking member 13 with the nut 15, the insertion member 12 is prevented from slipping out upward from the through hole 11c.

The locking member 13 further includes a second piece 13c that extends upward continuously from the first piece 13b. This second piece 13c is such that when the locking member 13 is fixed to the insertion member 12 with the nut 15, the surface S1 of the horizontal movement suppressing member 20 on the side facing the bridge girder A is flush with the surface 11a of the buffer body 11. They are formed to be flush with each other or substantially flush with each other.

The locking member 13 further includes a third piece 13d that continues from the second piece 13c and extends rearward with respect to the bridge girder B in front. This third piece 13d is placed on the upper surface of the cushioning material bracket 22.

A through hole 13e is formed in the locking member 13. The anchor bolt 17 inserted through the through hole 13e is screwed into the cushioning material bracket 22 from the upper surface of the cushioning material bracket 22 downwardly, so that the third piece 13d of the locking member 13 is attached to the cushioning material bracket 22. It is removably fixed on the top surface.

The fall prevention member 14 is an elongated rectangular piece made of steel or the like and whose width is the same as or narrower than the thickness of the buffer body 11 . A plurality of through holes 14a are formed in the fall prevention member 14, corresponding to the positions of the through holes 11c formed in the buffer body 11, respectively. The fall prevention member 14 comes into contact with the lower end surface of the buffer body 11 by screwing the nut 16 with the lower end 12b with the lower end 12b of the insertion member 12 inserted into each through hole 14a. Fixed state.

This prevents the insertion member 12 from slipping out upward from the through hole 13a, and also effectively prevents the shock absorber 11 from being deformed by the nut 16 compared to the case where the drop-off prevention member 14 is not present. It becomes possible. Note that the fall prevention member 14 may correspond to all the through holes 11c formed in the buffer body 11, but there may be a plurality of fall prevention members in one cushioning material 10, and each fall prevention member It may correspond to some of the through holes 11c formed in the buffer body 11. Moreover, it may correspond to each through hole 11c like a washer.

Note that the fall prevention member 14 may also be provided on the upper end surface of the buffer body 11. In this case, the locking member 13 may be positioned on the upper surface of the falling-off prevention member 14. Further, the fall prevention member 14 and the locking member 13 may be integrated, that is, the first piece 13b of the locking member 13 may be replaced with the fall prevention member 14. In addition, the first piece 13b and the falling-off prevention member 14 are arranged so that the ends facing the surface of the bridge girder A are connected to the cushioning material 11 so as not to receive an impact when the bridge girder A and the cushioning material 11 collide. The position is set back by a predetermined distance from the plane 11b. This predetermined distance is set to be greater than or equal to the maximum amount of deformation that can occur in the cushioning material 11 when the bridge girder A and the cushioning material 11 collide.

Hereinafter, a method of constructing a bridge collapse prevention structure using the above-mentioned cushioning material 10 will be explained.

In this construction method, first, the horizontal movement suppressing member 20 is installed at a predetermined position on the pier B.

Thereafter, the cushioning material 10 is inserted deep into a predetermined position between the bridge girder A and the horizontal movement suppressing member 20 while keeping the locking member 13 located above the upper end of the cushioning material bracket 22.

In this state, the cushioning material 10 is moved downward so that the third piece 13d of the locking member 13 is placed on the upper surface of the cushioning material bracket 22. Then, by inserting the anchor bolt 17 through the through hole 13e formed in the third piece 13d of each locking member 13 and screwing the anchor bolt 17 downward, the cushioning material 10 is attached to the locking member. It is attached to the horizontal movement suppressing member 20 via 13. Note that the third piece 13d of the locking member 13 may be placed on the upper surface of the cushioning material bracket 22 and then slid toward the back.

As explained above, since the locking member 13 is fixed to the upper end of the insertion member 12 and the falling-off prevention member 14 is fixed to the lower end, the insertion member 12 is prevented from falling off from the buffer body 11 for a long period of time. This makes it possible to reliably prevent this.

Further, when installing the horizontal movement suppressing member 20 on the pier B, the buffer material 10 is not attached to the horizontal movement suppressing member 20. Therefore, compared to the conventional case in which the horizontal movement suppressing member with the cushioning material attached is installed on the pier B, the gap between the horizontal movement suppressing member 20 and the bridge girder A becomes wider, so the horizontal movement suppressing member 20 is It becomes possible to facilitate the installation work.

Further, after removing the anchor bolt 17, the cushioning material 10 can be removed from the horizontal movement suppressing member 20 by moving the cushioning material 10 upward and then moving the cushioning material 10 toward the front. In this way, the buffer material 10 can be attached to and detached from the horizontal movement suppressing member 20 installed on the pier B. Therefore, compared to the conventional case where it is necessary to remove the horizontal movement suppressing member from the pier B when replacing the cushioning material, it is also possible to facilitate the replacement work of the cushioning material 10.

Note that the present invention is not limited to the above-described cushioning material 10, and can be modified as appropriate. For example, the specific configurations of the respective constituent members of the cushioning material 10 and the horizontal movement suppressing member 20 are not limited to those described above.

For example, the base bracket 21 of the horizontal movement suppressing member 20 may be made of steel, and may be installed on the side of the pier B or placed on the pier B and fixed by a large number of anchors. In this case, a joining hole passing through the horizontal movement suppressing member 20 in the vertical direction is provided, a PC steel rod or the like is installed passing through this joining hole and the bolt hole of the base bracket 21, and the upper and lower parts are fixed with nuts to be integrated. Just connect it to.

Furthermore, a case has been described in which one of the heavy objects in the present invention is the horizontal movement suppressing member 20 installed on the pier B, and the other heavy object in the present invention is the bridge girder A. However, what corresponds to the two heavy objects of the present invention is not limited to this. For example, if one of the heavy objects of the present invention corresponds to a foundation, and the other heavy object of the present invention corresponds to a building, and the cushioning material of the present invention is a seismic isolation rubber, the present invention is seismically isolated. May be applied to structures. Further, one of the heavy loads of the present invention corresponds to a quay, and the other heavy load of the present invention corresponds to a ship, and the cushioning material of the present invention may be used as a fender. Further, one of the heavy objects of the present invention corresponds to a rail structure, and the other heavy object of the present invention corresponds to a roller crane or a railway vehicle, and the cushioning material of the present invention is used between these structures. It may also be used as a cushioning material.

DESCRIPTION OF SYMBOLS 10...Cushioning material for horizontal movement suppression, buffering material, 11...Buffer body, 11a, 11b...Plane, 11c...Through hole, 12...Insertion member, 12a...Upper end (portion protruding from the upper end of buffer body), 12b... Lower end portion (portion protruding from the lower end of the buffer body), 13...Locking member, 13a...Through hole, 13b...First piece, 13c...Second piece, 13d...Third piece, 13e...Through hole, 14... Fall prevention member, 14a... Through hole, 15, 16... Nut, 20... Horizontal movement suppressing member (one heavy object), 21... Base bracket, 21a... Top surface, 22... Cushioning material bracket, A... Bridge girder (other side) (heavy objects), B... Piers, S1, S2... Horizontally opposing surfaces

Claims (6)

A cushioning material that is attached to one of two heavy objects having horizontally opposing surfaces with a horizontal gap between the surface of the other heavy object,
a buffer body formed with a plurality of through holes penetrating in the vertical direction;
a plurality of insertion members respectively inserted into the through holes;
a locking member that has a locking portion that is fixed to a portion of each of the plurality of insertion members that protrudes from the upper end of the buffer body, and that is detachably fixed to the one heavy object;
A cushioning material comprising: a falling-off prevention member fixed to a portion of each of the plurality of insertion members protruding from a lower end of the buffer body to prevent each of the insertion members from falling out from the through hole. A male thread is formed in each of the portions of the plurality of insertion members protruding from the lower end of the buffer body, and the falling-off prevention member is fixed to each of the plurality of male threads using a nut. The cushioning material according to 1. A male thread is formed in each of the portions of the plurality of insertion members protruding from the upper end of the buffer body, and each of the locking members is fixed to the male thread using a nut. The buffer material according to 2. Any one of claims 1 to 3, wherein each of the locking members has a through hole formed therein, and is engaged with the upper part of the one heavy object by an anchor bolt inserted through the through hole. Cushioning material as described in section. The cushioning material according to any one of claims 1 to 4, wherein the one heavy object is a horizontal movement suppressing member disposed on a bridge pier, and the other heavy object is a bridge girder. The buffer material according to claim 5, wherein the horizontal movement suppressing member is a reinforced concrete structure.

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