After the installation of outdoor rain and sewage pipes is completed, what is the thickness of the b

It is clearly described in the atlas of Anhui 2002s203.

The backfill thickness of the outdoor drainage pipe is the thickness of the covering soil plus the depth of burial! Hello, glad to answer for you. The backfill thickness of the outdoor drainage pipe is not higher than the soil freezing line above the meter, and the covering thickness is not less than the meter, and the covering thickness plus the buried depth is under the roadway, generally should not be less.

There is a note in this article: when the freezing line of the soil is shallow and the pipe is guaranteed to be protected from external loads, the thickness of the covering soil can be reduced as appropriate. Cover thickness means:

the distance from the collapsed ground to the top of the tube; The high burial depth means that the distance from the ground to the bottom of the pipe (i.e. covering thickness + pipe diameter d) has encountered two measures: 1, the small pipe diameter drainage can be steel casing, 2, if it is only partially made into a pipe trench, let the pipe go in the pipe trench.

If all pipelines take action. :) hope mine can help you! Do you have any other questions?

Whether the backfill of outdoor drainage pipe sewage pipe adopts sand backfill specification. Is there a clear specification in the atlas, does the bellows backfill need to be backfilled at 180 degrees? Ask a professional to tell you if you have to backfill with sand.

If the backfill of the undisturbed soil needs to be demonstrated, or does it need to be surveyed and reported?

1. Bricks, stones, wood blocks and other sundries should be cleaned up; 2. When using open ditch drainage, the drainage ditch should be kept unblocked, and there should be no water accumulation in the ditch; 3. When the well point is used to reduce the groundwater level, the dynamic water resistance level should be kept below the bottom of the trough not less than the above content is sorted out according to the problems encountered in the actual work of the students, for reference, if there is any problem, please communicate and correct when hail.

The backfilling should be carried out after the acceptance of the drainage pipeline (including the pipeline and the inspection well), and at the same time as the backfilling of the pipeline trench.

Before backfilling, sand bags, steel drills, and wooden supports can be used to fix the well seat and wellbore, and the water accumulation in the foundation pit trench should be eliminated.

Backfill material: The trench backfill material from the base surface of the pipe bottom to the range above the top of the pipe can be crushed stone chips, gravel with a particle size of less than 40mm, high (medium) calcium fly ash, medium coarse sand or good soil excavated from the trench.

The backfill shall not be made of silt, garbage and frozen soil, etc., and shall not be entrained with stones, bricks and other hard objects with water chestnuts.

When the maximum local permafrost depth is greater than or equal to the frozen layer, it should be backfilled with medium coarse sand at least 100mm around the wellbore.

The backfill should be manually layered symmetrical backfill, and its compactness is consistent with the pipeline backfill, and the wellbore must not be displaced and tilted, and mechanical backfilling is strictly prohibited.