There are many types of pipeline construction and dredging maintenance blocking in municipal engineering, such as underwater wall blocking, steel plate blocking, dry mix blocking, concrete mold bag blocking and so on. The sealing principle of the sewage pipe is based on the actual pipeline conditions and the strength of the water flow in the pipe. In order to avoid the water pressure generated by the upstream water flow after the sealing time is too long and the water pressure is a certain threat to the downstream construction personnel, the sealing distance is determined according to the actual situation, and the water inlet of the upstream and intersection Wells is blocked first. Before plugging, open the well cover within the scope of the road section to be constructed and place the fence or eye-catching signs, and use a gas detector to detect the gas in the well to ensure that there is no toxic gas before plugging the well, and must be equipped with oxygen for construction. Because there are many branch pipe outlets in the pipeline, the rubber air bag assisted plugging technology is adopted in the submersible plugging section (in the construction pipe section), which is convenient for the smooth development of the construction, and avoids the incomplete drainage caused by the elevation difference of some well locations, which affects the normal dredging.

Process and main construction method of sealing air bag in sewage pipeline

A. Construction process: construction preparation - plugging hole measurement - hole inspection and cleaning - air bag placement - inflation inspection - air bag recovery.

B. Main construction methods of pipe blocking air bag (municipal sewage pipe blocking company)

Construction preparation (1) Familiar with the drawings, carefully refer to the relevant underground pipeline layout, check the elevation and size of various pipelines, check the internal situation of the pipeline, have problems in time with the relevant personnel to study and solve, select matching pipeline airbag parameters. (2) Tool, pipe water plugging bag, composed of air bag, pressure gauge, tee, 6m long special air hose and air pump.

Check and clean up: (1) Check whether the surface of the pipe sealing air bag is clean, whether there is dirt attached, whether it is intact, fill a small amount of gas to check whether the accessories and air bags are leaky, check whether the pressure gauge pointer is pointing to zero, carefully look at the unit of the pressure gauge (such as MPa, bar, kPa, Pa must be clear), to avoid misreading the unit of the pressure gauge. Excessive charging pressure causes the airbag to rupture. Only after it is confirmed that it is normal can it enter the pipeline for plugging operation.

(2) Before sealing, check whether the inner wall of the pipeline is smooth and smooth, and whether there are sharp objects such as protruding burrs, glass, and stones. If there are any, remove them immediately to avoid punctures of the air bag. After the air bag is placed in the pipeline, it should be placed horizontally, not twisted to avoid trapping the gas to blow up the air bag.

(3) When the special sealing air bag for flammable and explosive medium pipelines needs to be opened, it should be noted that the diameter of the opening hole must be larger than the diameter of the unfoldable part of the air bag to facilitate insertion and removal.