1.前言国营45号线路沿着太平洋海岸延伸,连结仙台、八户、青森,是继纵贯内陆的4号线以后的又一条纵贯日本东北部的公路干线。这条线路对沿海城市具有相当重要的意义。织笠河流入宫古,釜石两市中间的内海,是海岸公园的一部分,山田湾的最深处,织笠桥就位于河口附近。该桥是作为66年开始动工的三陆国道的一部分,按大约3年的施工计划 1. Introduction State-run Route 45, which stretches along the Pacific coast, links Sendai, Hachinohe and Aomori, and is another main thoroughfare running through the northeastern part of Japan after the inland No.4 line. This route is of great importance to coastal cities. Zizhu River flows into Miyako, Kamaishi two cities in the middle of the sea, is part of the Marine Park, Yamada Bay in the deepest, weaving Liqiao is located near the estuary. The bridge is part of the Sanyo National Road, which started construction in 66 years. Based on a construction plan of about 3 years,