Buffer material

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

[Technical Field]

[0001] The present invention relates to a cushioning material, and more particularly to a cushioning material that is attached to one of two heavy objects that are spaced apart horizontally. [Background technology]

[0002] For example, to prevent a bridge from collapsing, horizontal movement suppression members that suppress the horizontal movement of the bridge girder are sometimes attached to the bridge piers. In this case, a buffer material is attached to the horizontal movement suppression member to suppress the impact when the bridge girder and the horizontal movement suppression member collide.

[0003] Generally, a stepped through-hole is formed on the surface of the buffer facing the bridge girder in a direction perpendicular to this surface, and the buffer material is attached by inserting the through-hole into a bolt and screwing a nut onto it. However, in this case, the gap between the bridge girder and the horizontal movement suppression member is very narrow, even though it is within the allowable range of horizontal movement, so the buffer material cannot be replaced unless the horizontal movement suppression member is removed from the pier.

[0004] Therefore, Patent Document 1 describes a method of installing a buffer body on a bridge fall prevention wall (horizontal movement suppression member) by embedding multiple mounting pieces with protruding upper and lower ends into the buffer body so that they are flush with the mounting surface of the buffer body, and inserting anchor bolts into the through holes formed in each protruding end.

[0005] Patent Document 2 describes a method of installing a buffer rubber on a concrete wall by embedding and gluing a bolt into the buffer rubber (buffer), attaching a mounting steel plate to the protruding upper end of the bolt using a nut, inserting the bolt into a through-hole formed in the mounting steel plate, and fixing the bolt to the concrete wall (horizontal movement suppression member). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3599906 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-251411 Summary of the Invention [Problem to be solved by the invention]

[0007] In the technology described in Patent Document 1, the mounting pieces are coated with an adhesive or the like, placed in a formwork, and vulcanized to embed the mounting pieces into the mounting surface of the shock absorber. On the other hand, in the technology described in Patent Document 2, the bolts are embedded with a resin adhesive to be integrated with the shock absorber rubber. However, such a fixing method using an adhesive or the like cannot maintain a good fixed state for a long period of time.

[0008] In view of the above, an object of the present invention is to provide a cushioning material that can be securely fixed to a heavy member such as a horizontal movement suppression member for a long period of time. [Means for solving the problem]

[0009] 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 is characterized by comprising a cushioning body having a plurality of through holes formed therethrough in the vertical direction, a plurality of inserting members that are inserted into the through holes, a locking member that is fixed to each of the portions of the inserting members that protrude from the upper end of the cushioning body and has a locking portion that is detachably fixed to one of the heavy objects, and a fall prevention member that is fixed to each of the portions of the inserting members that protrude from the lower end of the cushioning body and prevents each of the inserting members from falling out of the through hole.

[0010] According to the cushioning material of the present invention, a locking member is fixed to the upper end of the inserting member and a fall prevention member is fixed to the lower end, making it possible to reliably prevent the inserting member from falling off the cushioning body for a long period of time.

[0011] In the cushioning material of the present invention, it is preferable that each of the portions of the multiple insertion members protruding from the lower end of the cushioning body has a male thread formed thereon, and that the anti-fall-out member is fixed to each of the multiple male threads using a nut.

[0012] In this case, deformation of the buffer body can be more effectively prevented than when a drop-off prevention member is fixed to each insertion member. Also, since the fixing is done using a nut, the fixing work is simple and it is easy to adjust the degree of tightening to the buffer body.

[0013] In addition, in the cushioning material of the present invention, it is preferable that a male thread is formed on each of the portions of the multiple insertion members protruding from the upper end of the cushioning body, and that each of the locking members is fixed to the male thread using a nut.

[0014] In this case, since the nuts are used for fastening, the fastening work is simple and it is easy to adjust the degree of fastening to the buffer body.

[0015] 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 an upper portion of one of the heavy objects by an anchor bolt inserted through the through hole.

[0016] In this case, the locking member can be easily and detachably fixed to the top of one of the heavy objects by the anchor bolt.

[0017] In the cushioning material of the present invention, it is preferable that, for example, the one heavy object is a horizontal movement suppression member placed on a bridge pier, and the other heavy object is a bridge girder.

[0018] In the cushioning material of the present invention, for example, the horizontal movement suppression member is a reinforced concrete structure. [Brief explanation of the drawings]

[0019] [Figure 1]1 is an explanatory diagram showing a bridge collapse prevention structure using a buffer material according to an embodiment of the present invention. [Figure 2] Schematic longitudinal cross-section of a bridge collapse prevention structure. [Figure 3] FIG. 10 is a schematic side view showing a state in which a buffer material is attached to the horizontal movement suppression member. DETAILED DESCRIPTION OF THE INVENTION

[0020] A horizontal movement suppression 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 Figures 1 to 3. Note that Figures 1 to 3 are diagrams for schematically explaining this embodiment, and the dimensions are exaggerated.

[0021] The buffer material 10 is attached to a horizontal movement suppression member 20 installed on a bridge pier B for the purpose of isolating bridge girder A, such as the main girder of a bridge such as an elevated bridge, from seismic shocks and preventing the bridge from collapsing. The horizontal movement suppression member 20 suppresses the horizontal movement of bridge girder A, and the buffer material 10 is installed with a specified gap between it and bridge girder A.

[0022] The horizontal movement suppression member 20 and the bridge girder A have surfaces S1 and S2 that face each other in the horizontal direction, and the buffer material 10 is provided between these surfaces S1 and S2, and is attached so that it abuts against one surface S1 and leaves a horizontal gap with the other surface S2. In this way, the buffer material 10 suppresses the impact when the bridge girder A collides with the horizontal movement suppression member 20. The horizontal movement suppression member 20 corresponds to one heavy object in the present invention, and the bridge girder A corresponds to the other heavy object in the present invention.

[0023] The horizontal movement suppression 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 bracket 22 to which the buffer material 10 is attached.

[0024] Although not shown, the base bracket 21 is fixed using nuts to a number of anchors that are installed in advance on the concrete pier B or that are fixed thereto by post-construction.

[0025] The buffer bracket 22 is provided integrally with the upper surface 21a of the base bracket 21. The buffer bracket 22 has a surface S1 with which the buffer 10 comes into contact.

[0026] The buffer bracket 22 may be made by pouring concrete integrally with the base bracket 21. Alternatively, the buffer bracket 22 may be made by first pouring concrete up to the upper surface 21a to make the base bracket 21, and then pouring more concrete on top of that. In this case, the buffer bracket 22 may be made by pouring concrete on-site, or may be a precast member.

[0027] The joining structure between the buffer bracket 22 and the base bracket 21 may be, for example, such that connecting bars protrude from the upper surface 21a of the base bracket and are fixed into the buffer bracket 22, in which case the connecting bars may be post-installed anchors. Alternatively, a structure may be used in which connecting holes are provided that pass vertically through the base bracket 20 and the buffer bracket 22, and PC steel rods or the like are inserted and fixed at the top and bottom with nuts.

[0028] The cushioning material 10 includes a cushioning body 11, an insertion member 12, a locking member 13, and a fall prevention member 14.

[0029] The buffer 11 has a rectangular flat surface 11a that is in face contact with the mounting surface S1 of the buffer bracket 22, and a flat surface 11b that is parallel to this flat surface 11a and faces the surface S2 of the bridge girder A across a predetermined gap, and is approximately rectangular plate-shaped overall.

[0030] The buffer 11 has a plurality of through holes 11c formed therein, which penetrate in the vertical direction when the buffer 11 is installed on the horizontal movement suppression member 20. The buffer 11 may be the same as a conventional buffer except for the through holes 11c formed therein, and may be made of, for example, rubber.

[0031] The inserting members 12 are inserted through the through holes 11c formed in the buffer body 11. An upper end 12a of the inserting members 12 protrudes upward from the upper end of the buffer body 11, and a lower end 12b of the inserting members 12 protrudes downward from the lower end of the buffer body 11. Male threads are formed on the upper end 12a and the lower end 12b. It is also possible to use, as the inserting members 12, cut bolts (long thread bolts) having male threads formed along their entire length.

[0032] The locking member 13 is made by bending a rectangular piece made of metal such as steel. The locking member 13 is configured to be able to detachably lock the buffer material 10 to the horizontal movement suppression member 20, more specifically, to the upper surface of the buffer material bracket 22, with a horizontal gap between the locking member 13 and the surface S2 of the bridge girder A.

[0033] Locking member 13 has a first piece 13b extending in a horizontal plane and having through hole 13a formed therein, through which upper end portion 12a of inserting member 12 is inserted. With the lower surface of first piece 13b abutting against the upper end surface of buffer body 11, locking member 13 is fixed to inserting member 12 by a nut 15 that screws onto upper end portion 12a of inserting member 12. In this way, by fixing first piece 13b of locking member 13 by nut 15, inserting member 12 is prevented from slipping out upward through through hole 11c.

[0034] The locking member 13 further has a second piece 13c extending upward continuously from the first piece 13b. The second piece 13c is formed so that, when the locking member 13 is fixed to the insertion member 12 with the nut 15, the surface S1 of the horizontal movement suppression member 20 facing the bridge girder A is flush or approximately flush with the surface 11a of the buffer body 11.

[0035] The locking member 13 further has a third piece 13d that is continuous with the second piece 13c and extends rearward relative to the front bridge girder B. This third piece 13d is placed on the upper surface of the buffer bracket 22.

[0036] A through hole 13e is formed in the locking member 13. An anchor bolt 17 is inserted through this through hole 13e and threaded downward from the top surface of the buffer bracket 22 into the buffer bracket 22, whereby the third piece 13d of the locking member 13 is detachably fixed to the top surface of the buffer bracket 22.

[0037] The fall-prevention member 14 is a long, narrow rectangular piece made of steel or the like, with a width equal to 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. The fall-prevention member 14 is fixed in a state of abutment against the lower end surface of the buffer body 11 by threading nuts 16 onto the lower end portions 12b of the inserting members 12 with the lower end portions 12b inserted into the respective through holes 14a.

[0038] This prevents insertion member 12 from slipping out upward from through hole 13a, and also makes it possible to more effectively prevent deformation of buffer 11 by nuts 16 than when no fall-off prevention members 14 are present. Note that fall-off prevention members 14 may correspond to all of the through holes 11c formed in buffer 11, or a plurality of fall-off prevention members may be present in one buffer material 10, with each fall-off prevention member corresponding to a portion of the through holes 11c formed in buffer 11. Alternatively, each fall-off prevention member may correspond to an individual through hole 11c, like a washer.

[0039] The upper end surface of the buffer 11 may also be provided with a fall-off prevention member 14. In this case, the locking member 13 may be positioned on the upper surface of the fall-off prevention member 14. The fall-off prevention member 14 and the locking member 13 may be integrated, i.e., the first piece 13b of the locking member 13 may be replaced with the fall-off prevention member 14. Furthermore, the end of the first piece 13b and the fall-off prevention member 14 facing the surface of the bridge girder A is set back a predetermined distance from the flat surface 11b of the buffer 11 so that they are not subjected to impact when the bridge girder A and the buffer 11 collide. This predetermined distance is set to be equal to or greater than the maximum deformation that can occur in the buffer 11 when the bridge girder A and the buffer 11 collide.

[0040] A method for constructing a bridge collapse prevention structure using the above-described buffer material 10 will be described below.

[0041] In this construction method, first, the horizontal movement suppression member 20 is installed at a predetermined position on the pier B.

[0042] Thereafter, between the bridge girder A and the horizontal movement suppression member 20, the buffer material 10 is inserted deep to a predetermined position while keeping the locking member 13 positioned above the upper end of the buffer material bracket 22.

[0043] Then, in this state, the buffer material 10 is moved downward so that the third pieces 13d of the locking members 13 are placed on the upper surface of the buffer material bracket 22. Then, the anchor bolts 17 are inserted into the through holes 13e formed in the third pieces 13d of each locking member 13 and screwed downward, thereby attaching the buffer material 10 to the horizontal movement suppressing member 20 via the locking members 13. Note that the third pieces 13d of the locking members 13 may be slid toward the back while placed on the upper surface of the buffer material bracket 22.

[0044] As described above, the locking member 13 is fixed to the upper end of the inserting member 12, and the anti-fall-off member 14 is fixed to the lower end, so that the inserting member 12 can be reliably prevented from falling off the buffer body 11 for a long period of time.

[0045] Furthermore, when the horizontal movement suppression member 20 is installed on the pier B, the buffer material 10 is not attached to the horizontal movement suppression member 20. Therefore, compared to the conventional case where a horizontal movement suppression member with a buffer material attached is installed on the pier B, the gap between the horizontal movement suppression member 20 and the bridge girder A is wider, which makes it possible to facilitate the work of installing the horizontal movement suppression member 20.

[0046] Furthermore, after removing the anchor bolts 17, the buffer material 10 can be moved upward and then moved forward, thereby removing the buffer material 10 from the horizontal movement suppression member 20. In this way, the buffer material 10 is detachable from the horizontal movement suppression member 20 installed on the pier B. Therefore, compared to the conventional case where the horizontal movement suppression member had to be removed from the pier B when replacing the buffer material, this also makes it easier to replace the buffer material 10.

[0047] The present invention is not limited to the above-described buffer material 10, and can be modified as appropriate. For example, the specific configurations of the components of the buffer material 10 and the horizontal movement suppression member 20 are not limited to those described above.

[0048] For example, the base bracket 21 of the horizontal movement suppression member 20 may be made of steel and installed on the side of the pier B, or may be fixed with a number of anchors by being placed on top of the pier B. In this case, the horizontal movement suppression member 20 may be provided with a connecting hole that passes through it vertically, and a PC steel rod or the like may be installed that passes through this connecting hole and the bolt hole of the base bracket 21, and the top and bottom may be fastened together with nuts to join them together.

[0049] In addition, the case has been described in which one heavy object of the present invention corresponds to the horizontal movement suppression member 20 installed on the bridge pier B, and the other heavy object of the present invention corresponds to the bridge girder A. However, the two heavy objects of the present invention are not limited to this. For example, one heavy object of the present invention may correspond to a foundation, and the other heavy object of the present invention may correspond to a building, and the cushioning material of the present invention may be a seismic isolation rubber, and the present invention may be applied to a seismic isolation structure. Furthermore, one heavy object of the present invention may correspond to a quay wall, and the other heavy object of the present invention may correspond to a ship, and the cushioning material of the present invention may be a fender. Furthermore, one heavy object of the present invention may correspond to a rail structure, and the other heavy object of the present invention may correspond to a roller crane or a railway vehicle, and the cushioning material of the present invention may be used as a cushioning material between them. [Explanation of symbols]

[0050] DESCRIPTION OF SYMBOLS 10... Horizontal movement suppression buffer material, buffer material, 11... buffer body, 11a, 11b... flat surface, 11c... through hole, 12... insertion member, 12a... upper end (portion protruding from the upper end of the buffer body), 12b... lower end (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 suppression member (one heavy object), 21... base bracket, 21a... upper surface, 22... buffer material bracket, A... bridge girder (other heavy object), B... bridge pier, S1, S2... horizontally opposing surfaces

Claims

1. A method for installing a buffer material, which is replaceably attached to one of two heavy objects having horizontally opposing surfaces with a horizontal gap between the buffer material and the surface of the other heavy object, comprising: the one heavy object is a buffer bracket having a surface against which the buffer body of the buffer abuts and a surface on which a third piece of the locking member of the buffer is placed, the buffer material has a flat surface that is in surface contact with the buffer material bracket, and a flat surface that is parallel to the flat surface and faces the other heavy object across a predetermined gap, and is a plate-like buffer body having a plurality of through holes that penetrate in the vertical direction; a plurality of long threaded bolts inserted into the through holes, respectively; the locking member includes a first piece extending horizontally and having a through hole formed therein through which the upper end of the long threaded bolt is inserted, the first piece being fixed with a nut to the portions of the plurality of long threaded bolts protruding from the upper end of the buffer body, and being detachably locked to the buffer bracket, which is one of the heavy objects; a second piece extending upward continuously from the first piece; and a third piece extending rearward continuously from the second piece with respect to the other heavy object in front of the first piece and having a through hole formed therein through which an anchor bolt is inserted; and a fall-off prevention member that is fixed to the portions of the plurality of long-threaded bolts that protrude from the lower end of the buffer body using a nut, and that prevents each of the long-threaded bolts from falling out of the through hole, a cushioning bracket for supporting the cushioning material and the cushioning member for supporting the cushioning material in a predetermined position between the cushioning bracket and the other heavy object, the cushioning material being inserted deep into the predetermined position, and an anchor bolt is inserted into the through hole formed in each of the third pieces of the plurality of locking members placed on the upper surface of the cushioning bracket and screwed downward, thereby allowing the cushioning material to be removably attached to the cushioning bracket via the locking members.

2. A method for installing a buffer material as described in claim 1, characterized in that, between the buffer material bracket, which is one of the heavy objects, and the other heavy object, the buffer material is pushed back to a predetermined position while maintaining the locking member positioned above the upper end of the buffer material bracket, and then the buffer material is moved downward, so that each of the third pieces of the multiple locking members is placed at a predetermined position on the upper surface of the buffer material bracket.

3. A method for installing a buffer material as described in claim 1, characterized in that, between the buffer material bracket, which is one heavy object, and the other heavy object, the third piece of the locking member located at at least the end is placed on the upper surface of the buffer material bracket, and the buffer material is then slid toward the back and inserted, so that each of the third pieces of the multiple locking members is placed at a predetermined position on the upper surface of the buffer material bracket.

4. A method for installing a buffer material according to any one of claims 1 to 3, characterized in that one of the heavy objects is a buffer material bracket of a horizontal movement suppression member placed on a bridge pier, and the other heavy object is a bridge girder.

5. 5. The method for installing a buffer material according to claim 4, wherein the horizontal movement suppressing member is a reinforced concrete structure.

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