When installing sleeve compensator, bellows compensator, valve, drainage and decontamination device and other equipment accessories for underground pipelines, an inspection room shall be set.
The manhole shall avoid the equipment in the inspection room.
The distance between the surface of main pipe insulation structure and the ground of inspection room shall not be less than 0.6m; 4 the manhole diameter of the inspection room shall not be less than 0.7m, the number of manholes shall not be less than 2, and shall be arranged diagonally.
The width of pedestrian passage shall not be less than 0.6m; 3.
The inspection room shall meet the following requirements: 1.
The clearance height shall not be less than 1.8m; 2.
The ground of the inspection room shall be no less than 0.3m lower than the inner bottom of the pipe trench; 7.
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When the height of the indoor ladder is greater than 4m, a guardrail shall be set or a platform shall be set in the middle of the ladder.
When the clearance area of the inspection room is less than 4m2, only one manhole can be set; 5 at least one sump shall be set in the inspection room and placed under the manhole; 6.
