塑料检查井进行回填的要求

After passing the acceptance of the pipeline concealment project, the construction of the ditch cover should be stopped. Before covering the soil, it is necessary to clear the debris at the bottom of the tank, such as bricks.

Prior to the airtightness experiment, in addition to being able to discuss parts of the exposed, the top of the pipe on both sides of the pipeline(not less than 0.5 M) must be backfilled. After the gas tightness experiment is stopped, other parts should be backfilled in real time;

During the backfilling process, there shall be no water in the tank or backfill. During the rainy season, when drainage is difficult, a method should be adopted to link the dirty pipes with the backfill soil to avoid pipeline drift. First, the top of the pipe is stopped backfilling(at least 0.5 meters) and compacted.

The grooves on both sides of the structure, such as pipelines and test wells, are returned to the ground to ensure that there is no bias between the channel and the structure;

Manual backfilling must be used for 0.5 M bottom to top of the pipeline, and machine backfilling is strictly prohibited.

When the top of the pipe surpasses 0.5 M via the process machine, it should stop evenly from both sides of the pipe axis and stop compacting and compacting.

When the groove is supported by a steel plate pile, the steel plate pile can be removed after backfilling to a defined height. After removal, the pile hole should be filled in real time, and the method is adopted to fill the pile hole. When using sand filling, it can be washed with water; It can also be used for grouting when pulling piles;

The vertical deformation of the pipeline should be strictly controlled when the groove is filled back. When the diameter of the pipe is large and the top soil of the pipe is high, permanent support or pre-deformation can be set up in the pipe.