What are the cities with good underground pipeline management in China 5

Urban underground pipelines mainly include water supply, drainage (reclaimed water, rainwater, sewage), gas (natural gas), heat, electricity, communications, radio and television, lighting, traffic signals, industrial pipelines and their ancillary facilities.

The direct management of urban underground pipelines belongs to the management of professional ownership units of underground pipelines.

The supervision of the urban underground pipeline industry is mainly divided into types of supervision: water supply and drainage (reclaimed water, rainwater, sewage) pipelines and ancillary facilities are generally supervised by the Water Affairs Bureau; Gas (natural gas) pipelines and ancillary facilities are generally supervised by the City Management Committee, the Municipal City Appearance Committee, and the China Gas Office; Thermal pipelines and ancillary facilities are generally supervised by the Thermal Office of the Municipal Appearance Committee of the City Management Committee; The power pipelines and ancillary facilities were previously supervised by the industry, and after the reform, the Coal and Power Office of the Municipal Management Committee and the Municipal City Appearance Committee was supervised; Communication pipelines and their ancillary facilities are generally supervised by the Communications Administration; Radio and television pipelines and their ancillary facilities are generally supervised by the State Administration of Radio, Film and Television; Lighting pipelines and their ancillary facilities are generally supervised by the City Management Committee, the Municipal City Appearance Committee, and the Urban Lighting Department; Traffic signal pipelines and their ancillary facilities are supervised by the Traffic Facilities Section of the Public Security Bureau; Industrial pipelines and their ancillary facilities are generally supervised by the Work Safety Bureau.

Specifically, it belongs to that department, and it is necessary to look at the industry where the pipeline is located, and the general city management committee and the municipal city appearance committee will set up a pipeline department or municipal pipeline department and other departments, which are responsible for the comprehensive coordination and management of underground pipelines in the region.

Electricity pipelines belong to electric power companies, and telecommunications pipelines belong to telecommunications companies or professional pipeline companies. Others belong to municipal or user units.

Pipe chicken feathers, dig casually, it's fine.

Underground pipes.

The burial method separates two types: groove and non-groove. Grooved burial, the pipe is laid or masonry in the open-cut soil groove, and then the soil is backfilled and compacted. Without slotting and buriing, first excavate a small section of pipe hole under the ground with high-pressure water, manual or mechanical, and then use a jack at the back of the pipe to push the pipe into the soil (see pipe jacking method).

Large-scale pipelines can be constructed by shield method, that is, high-pressure water, manual or mechanical excavation is used in the shield at the front end of the pipeline, and the shield is jacked forward at the same time, and then the prefabricated arc-shaped block is assembled into a pipe at the rear of the shield, and the gap between the outside of the pipe and the soil is filled with grouting, and the inside is lined with anti-seepage.

Underwater pipes. Generally, they are buried in the underwater soil layer and encapsulated with concrete or anchored with materials such as steel bars to prevent the pipeline from floating. A concrete protective layer of not less than 500 mm thick should be poured on the upper part of the pipeline or other protective measures should be taken to prevent the destruction of the pipeline when the ship is anchored. When the river channel or strait that crosses can not be cut off, in addition to adopting the above-mentioned pipe jacking method and shield method, the immersed pipe method can also be adopted, first at the bottom of the river or the seabed with a dragline to pull out the trench, the pipeline is floated in place in sections and then sunk into the groove, and the pipeline is mostly made of steel pipe or prefabricated reinforced concrete rectangular pipe.

China has built undersea pipelines such as a submarine water supply pipeline from Xiamen to Gulangyu Island, an oil pipeline across the Yellow River, and a rectangular reinforced concrete drainage pipeline across the Huangpu River in Shanghai. The submarine pipeline has been built internationally with a depth of 160 meters and a diameter of 910 mm, and special offshore platforms and small submarines are used for burial and inspection.

When the underwater pipeline has the requirement of thermal insulation and anti-corrosion, the outer casing pipe can be laid first, and then the inner pipe can be installed, and the insulation material or concrete can be filled between the two pipes.

Overhead pipelines Overhead pipelines in industrial and mining areas are mostly installed on reinforced concrete or steel supports with steel pipes, and the distance between the supports is generally not more than 30 meters, and the strength of the pipeline itself is used to cross to form a continuous beam on the support. The overhead pipeline across rivers and canyons is called pipeline bridge, and when the span is not large, the strength of the pipeline itself can be used to cross, such as making steel pipe beams, steel pipe arches and other forms; When the span is large, another supporting structure should be built to place the pipeline, and there are many forms of this structure, and China has built a variety of long-span suspension and porous continuous diagonal tension (tension) pipeline bridges.