Weihai 450 caliber plastic manhole/Weihai 500 caliber plastic manhole manufacturer

Backfilling steps of plastic manhole:

Inspection well fixation

The top priority of the backfilling work of the plastic inspection well is the fixing work. It is necessary to fix the foot base of each part of the inspection well at a high level and use steel chisels to reinforce it. http://www.sdpegj.com/

drainage

In order to prolong the service life of the plastic inspection well and carry out the work better, the accumulated water in the inspection well shall be completely removed before backfilling. The method of atmospheric pressure can be used The Conduit The siphon effect of will drain water.

Inject backfill material.

After the water is removed, the backfill material can be injected after the hard soil layer appears on the surface of the well. The smaller particles of material shall be injected first, and the material with larger corners and volumes shall be covered on the backfill foundation.

Surrounding coarse sand landfill

The middle part and the foundation can not meet the needs of its fixation after backfilling, nor can it be effectively protected. Therefore, it is necessary to use coarse sand around the plastic inspection well for landfill. If the frozen soil high-rise is too large, the area of the surrounding coarse sand landfill will also be expanded.

Check backfill inclination

After backfilling, the inclination of backfilling is strictly prohibited, which will seriously affect the service life of the plastic inspection well, and the working effect will be greatly reduced. Only when the inclination of backfilling is horizontal can the displacement of the plastic inspection well be effectively prevented. http://www.zbpeg.com/