How to inspect a cement manhole:

Inspect the mechanical equipment for the junction of manhole seats and pipelines, starting with the equipment upstream and downstream of the service connections, progressing to the well tube and well tube equipment, and gradually lowering the branch pipes to broaden the main pipeline.

2. The construction method for connecting the manhole seat to the pipeline should be the same as that for connecting similar types of pipeline joints.

3. Sewage manhole covers and inlets. The connection of the discharge pipeline requires diameter changes. When using reducing connectors, if the inlet pipe is below the manhole socket pipe, the top of the pipe should be flush. When the socket of the manhole's discharge pipe exceeds the lower pipe, the outer bottom of the pipe should be flush.

4. When the pipe diameter is 3.15mm, use tools instead of a wrench.

5. For equipment with additional connectors, select the corresponding tool based on the drilling standard and the receiving diameter on the drilling wall. The circular edge of the hole should be lubricated, and the additional connectors of the equipment must not be reversed.

6. When groundwater levels are high or construction occurs during the dry season, technical measures should be adopted to prevent well floatation upon completion of pipeline (including manhole) equipment, but before irrigation tests are conducted.