The selection of instructions

·General situation selection instructions

1. Plastic drainage inspection well design, construction, inspection and maintenance in the new, expansion and renovation of urban and rural areas of municipal, residential area, public construction area of underground drainage pipeline project, the inspection well diameter is less than or equal to 1000 mm, the buried depth is less than or equal to 6 m.

2. Can human operation check Ii (pipe wall) well diameter should be greater than or equal to 700mm.

3. The water outlet of the road should be used in the inspection well seat of the mud chamber, the 450 is the start of the rain water outlet and the well diameter of the heavy mud well, and the well diameter is larger than the diameter of the drain pipe.

4. Well bore diameter is less than 700mm is in the shape of straight wall wells, wells wellbore diameter greater than 700mm shape for closing wells, wells close to 700mm diameter.

5. The well diameter of the well bore of residential district and public construction area is less than 700mm, and the municipal engineering plastic inspection well head is 700 to 1000mm.

6. The connecting position of the bottom hole seat and the end face of the shaft lining should be provided with 360 degree support surface.

 ·Type selection of rural sewage

Plastic inspection well seat construction installation: check the depth of the well buried to reach a certain standard, we must expand the scope of inspection, in order to facilitate maintenance personnel in the future. Specific as follows: 315*160 inspection wells, 400*225/450*225 inspection wells ouside 160 pipe in the construction of buried depth is more than equal to 1 meters, should the inspection well seat expansion port for ouside 315 inspection wells; ouside 225 pipe in the construction of buried depth greater than or equal to 1.5 meters, the inspection well seat expansion port for ouside 400-450 inspection wells; ouside 300 pipe in the construction of buried depth greater than or equal to 2 meters, the inspection well seat expansion port for ouside 600-630 inspection wells).

400 / 450 series oil retainer inspection wells: due to the economic development, around the emergence of a large number of farm restaurant and hotel and other facilities, to adapt to these conditions should be the corresponding small grease inspection well seat is arranged.

1000*300/400 manhole: first export inspection wells should be in front of the centralized sewage treatment pool is employed to examine the diameter expanding ouside 1000 diameter manhole, in order to facilitate the maintenance personnel work well under.

·The installation of real map