The plastic manhole for municipal drainage is a kind of prefabricated manhole, which is made of polymer materials and is used to replace the traditional brick and concrete manhole.

According to different structures, plastic inspection wells for municipal drainage can be divided into straight wall plastic inspection wells and closed plastic inspection wells.

For plastic inspection wells above OD1000, when the size of the well seat is larger than the diameter of the shaft, the closed structure can be used.

The closing inspection well is composed of well seat, closing cone, shaft, well cover and other relevant accessories.

According to the different installation positions of the closing cone, the closing inspection well can be divided into upper closing type (using external closing accessories) and lower closing type (using internal closing accessories).

According to the different shapes of closing cones, closing inspection wells can be divided into eccentric closing and concentric closing.

Installation of necking cone:

1. The specifications and dimensions of the wellhead cone and wellbore shall meet the design requirements.

2. The closing cone, shaft and well seat shall be connected with special rubber seals.

3. Special connection tools shall be used to tighten the connection without violence.

4. The height of the upper opening of the closing cone from the ground shall be in accordance with the design requirements.

5. During installation, certain margin should be reserved for the height of the shaft, which should be higher than the ground.

Hainan plastic inspection well