Anti-collapse buffer chain for bridge

Abstract

Provided is an anti-collapse buffer chain for bridge that enables the prevention of stress concentration on a contact portion between rings when an impact load acts. In an anti-collapse buffer chain for bridge 1 that includes a ring linked body 2 in which a plurality of rings are linked to one another, and a covering body 3 covering a peripheral area of the ring linked body 2, and prevents a bridge upper structure, such as a bridge girder, from collapsing by linking the bridge upper structure to a bridge lower structure, such as a bridge abutment and a bridge pier, excluding a part of an end ring 21a (21b) at an end portion, the ring linked body 2 is covered with a rubber elastic body, the end ring 21a (21b) is brought into contact with an adjacent ring 22a (22b) that is adjacent to the end ring 21a (21b), and a wire diameter of a ring steel material of one or both rings of the end ring 21a (21b) and the adjacent ring 22a (22b) is set to be larger than a wire diameter of a ring steel material of another ring of the ring linked body 2.

What is claimed is: 
     
         1 . An anti-collapse buffer chain for bridge that prevents a bridge upper structure, such as a bridge girder, from collapsing by linking the bridge upper structure to a bridge lower structure, such as a bridge abutment and a bridge pier, the anti-collapse buffer chain for bridge comprising:
 a ring linked body in which a plurality of rings are linked to one another; and   a covering body covering a peripheral area of the ring linked body, wherein   excluding parts of end rings at end portions, the ring linked body is covered with the covering body, and an adjacent ring adjacent to the end ring is in contact with the end ring, and   a wire diameter of a ring steel material of at least one ring of the end ring and the adjacent ring is set to be larger than a wire diameter of a ring steel material of another ring of the ring linked body.   
     
     
         2 . The anti-collapse buffer chain for bridge according to  claim 1 , wherein the wire diameter of the ring steel material of the adjacent ring is set to be larger than the wire diameter of the ring steel material of another ring of the ring linked body. 
     
     
         3 . The anti-collapse buffer chain for bridge according to  claim 1 , wherein the plurality of rings undergo a rustproofing treatment, such as hot dip galvanizing, then, undergo a rough surface treatment, such as a phosphoric acid treatment, and thereafter, are covered with the covering body. 
     
     
         4 . The anti-collapse buffer chain for bridge according to  claim 2  wherein
 the plurality of rings undergo a rustproofing treatment, such as hot dip galvanizing, then, undergo a rough surface treatment, such as a phosphoric acid treatment, and thereafter, are covered with the covering body. 
 
     
     
         5 . The anti-collapse buffer chain for bridge according to  claim 2 , wherein
 the wire diameter of the ring steel material of the adjacent ring is set to from 20% to 100% of an inner surface width of the end ring.   
     
     
         6 . The anti-collapse buffer chain for bridge according to  claim 2 , wherein
 the wire diameter of the ring steel material of the adjacent ring is set to from 50% to 100% of an inner surface width of the end ring.   
     
     
         7 . The anti-collapse buffer chain for bridge according to  claim 1 , wherein
 the end ring and the adjacent ring are connected in a state of being twisted at a first angle, the adjacent ring and another ring of the ring linked body covered by the covering body are connected in a state of being twisted at a second angle, and the first angle and the second angle are different angles.