Apparatus for prevention falling from upper structure of steel box bridge on simple support

摘要

The present invention is to provide a device for preventing the separation of the two superstructures of the simple bridge steel box bridge even in the event of an earthquake by simultaneously supporting the two steel box ends placed on one side facing the bridge in the longitudinal direction of the bridge, The connecting rod 12 into which the free joint steel ball 13 is integrated is inserted into the cylinder 11 by a hole drilled in the center of the outer plate 18 fitted to the outer end of the cylinder 11. A three-way spring shock absorber (1) having a spring (14) attached to a portion of the connecting rod (12) of the site and fitted with a connecting ring (16) with a pin hole (16a) perforated at the rear of the cylinder (11); Steel box on which the steel plate 13 of the steel box side buffer port 1a, 1b is received freely on the attachment plate 21, and the cap 23 which penetrates only the connecting rod 12 and restrains the steel ball is welded. Side fasteners 2; Support plate side fastener 3 to which steel balls 13 of support plate side buffer port 1c are received freely on the attachment plate 31, and only the connecting rod 12 penetrates and the cap 23a for restraining the steel balls is welded. )Wow; The upper structure of the steel box bridge on the simple point of the combination with the pier side support plate (4) in which the fastening hole 42 for the support plate side fastener (3) is provided on the top.