如何采取有效的手段保持管沟回填土，是涉及管道正常运营的大问题。
How to make the backfilled soil of pipeline trench stabilized in an effective manner is a major concern for the normal operation of pipeline.
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。
Consequently the bedding and backfilling of the trench need special attention to provide the required lateral support.
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.
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