Consequently the bedding and backfilling of the trench need special attention to provide the required lateral support.
其后，管道沟的垫土和回填需要特别注意，应提供所需要的水平支撑。
Abutment-a structure that supports the end of a bridge span and provides lateral support for fill material on which the roadway rests immediately adjacent to the bridge.
桥台-指支撑桥跨端部并为承载紧邻桥梁的道路的填方材料提供横向支撑的结构物。
Its capacity of resisting large external load enables it not to rely on lateral support of the soil, therefore its requirements on backfilling soil is lower than on flexible tubes.
由于它本身能抵抗较大的外荷载，使其不须依赖土壤的侧向支撑，因而对回填土要求较柔性管低。
Its capacity of resisting large external load enables it not to rely on lateral support of the soil, therefore its requirements on backfilling soil is lower than on flexible tubes.
由于它本身能抵抗较大的外荷载，使其不须依赖土壤的侧向支撑，因而对回填土要求较柔性管低。
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