| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple structural type pipe conduit bridge structure permitting an easy production and also easy maintenance control capable of corresponding even to a large displacement of the bridge substructure. SOLUTION: A pipe girder 10 having vertical pipes 2, 2 rising from a pair of abutments 1, 1 and also having a lateral pipe 3 connected rigidly to the tops of the vertical pipes 2, 2 at their ends is installed over a span of a pair of the abutments 1, 1. Each of the vertical pipes 2, 2 is connected in a freely bendable manner between an upper vertical pipe 2a and a lower vertical pipe 2b by a flexible expansion pipe 5. The pipe girder 10 has a pipe conduit bridge structure in which the pipe girder is supported by each of abutments 1, 1 in such a manner that the upper vertical pipe 2a is made bendable with respect to the lower vertical pipe 2b. According to this structure, if the substructure is laterally displaced in a pipe shaft direction of the lateral pipe, the flexible expansion pipe 5 functions as a hinge bearing by deforming the whole of the pipe girder 10 thereby being corresponding to the displacement. Also, if the pipe girder 10 is used as a water supply pipe, if an air value 4 is arranged at an end of the lateral pipe 3, then any facility such as a passage for the maintenance and control becomes unnecessary thereby offering a simple structure requiring only easy maintenance. COPYRIGHT: (C)2008,JPO&INPIT
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