1.前言荒川大桥是一座连接首都东京与琦玉的四线铁路大桥,全长639m。它使新干线与市郊铁路线平行地跨越河流。该桥座落在距东京站17.025km的地方,它与上游的户田桥相距大约70m(见图1)。河槽内的施工,只能在旱季进行(从十一 1. Introduction The Arakawa Bridge is a four-lane railway bridge linking the capital city of Tokyo with Saitama, measuring 639m in length. It spans the Shinkansen and the suburban railway line across the river. The bridge sits 17.025km from Tokyo Station, about 70m from the upper Toda Bridge (see Figure 1). Construction in the river channel can only be carried out during the dry season (from November 11)