不同直径的管道在检查井内的连接，宜采用管顶平接或水面平接。检查井井底宜设流槽，污水检查井流槽顶可与0.85倍大管径处相平，雨水（合流）检查井流槽顶可与0.5倍大管径处相平。流槽顶不宽度宜满足检修要求。
The connection of pipelines with different diameters in inspection wells should adopt flat top connection or water surface connection. Flow trough should be set at the bottom of inspection well. The top of flow trough of sewage inspection well can be equal to that of 0.85 times of large diameter, and the top of flow trough of rainwater (confluence) inspection well can be equal to that of 0.5 times of large diameter. The width of the top of the flume should not meet the maintenance requirements.
在污水干管每隔适当距离的检查井内，需要时可设置闸槽。接入检查井的支管（接户管或连接管）管径＞300mm时，支管数不宜超过三条。检查井和塑料管道应采用柔性连接。在排水管道每隔适当距离的检查井内和泵站前一检查井内，宜设置沉泥槽，深度宜为0.3~0.5m。
In the inspection wells of the main sewage pipe at appropriate distances, brake grooves can be set when necessary. When the diameter of branch (nozzle or connecting pipe) of access inspection well is more than 300 mm, the number of branch should not exceed three. Flexible connections shall be used for inspection wells and plastic pipes. In the inspection wells of drainage pipelines at appropriate distances and in the inspection wells before pumping stations, it is advisable to set up mud sinks with depths of 0.3-0.5m.