DRAINAGE SYSTEM OF BRIDGE SEAT SURFACE OF ABUTMENT AND PIER

摘要

To solve the problem in which: bridges all over Japan are aging and 50-year-old bridges are closed to traffic and are in danger of collapsing, and thus effective measures must be taken to prolong their lives; one of the causes is corrosion of steel girders and bearings caused by water leakage from expansion devices in the abutment and piers that support the bridge; and a possible countermeasure is to dig a drainage ditch into the bridge seat surface, but it damages the structure and lowers the load-bearing capacity, and it is not easy to find a place to pool and process the drained water.SOLUTION: It is simple if a plastic U-shaped drainage tray 18 is laid on the bridge seat surface no matter whether the bridge is a new or existing one. In addition to draining water leaked due to corrosion from the expansion device, by providing a U-shaped drainage tray inside the raindrop line, water from the horizontal bridge seat is collected with a guide liner and dropped, and stagnant water and perpetual wet conditions can be eliminated. A block member of 2 m long is comparatively light, and it can be easily extended even with a beam length of 10 m.SELECTED DRAWING: Figure 2