管子下入管沟后，由侧铲推土机或装有回填附件的拖拉机回填管沟。
Backfilling the trench following the lowering-in of the pipe is carried out by angledozers or backfilling attachments to tractors.
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.
如地下水中遇到的，它应保持低于管的方式抽水，直到管道已得到令人满意的测试，并回填。
Where ground water is encountered, it shall be kept below the pipe by means of pumping until the pipe has been satisfactorily tested and backfilled.
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