Large-diameter hot water pipe non-compensation direct-burried laying method

Abstract

The invention relates to a large-caliber hot water pipeline uncompensated direct burying method which comprises the following steps: (1) the temperature of media supplying heat and pressure in a pipeline are set in a certain range; (2) the depth of the direct burying of the pipeline is determined by a burying path, and a groove is excavated; (3) the bottom of the groove is tamped and leveled; (4) insulating tubes are processed, prefabricated and directly buried in a factory; (5) the prefabricated and directly buried insulating tubes are placed into the groove; (6) all prefabricated and directly buried insulating tubes are mutually connected, a compensator does not need mounting in fixed space; (7) the groove is backfilled at environmental temperature, and the pipeline does not need preheating before backfilling. The pipeline burying method is simple, and the pipeline does not need being mounted with a compensator in fixed space to absorb expansion with heat and contraction with cold caused by the temperature rise of hot water. The invention reduces the accident potential of a heat supply pipe network, and has the advantages of low daily maintenance work load, waterproof performance, good anticorrosion performance, low heat loss, long service life, short construction period and low construction investment. The invention is applicable to burying pipelines with the nominal diameter of DN600-DN1200.

Description

technical field [0001] The invention relates to a construction method of urban heat supply pipe network, in particular to a non-compensated direct burial laying method of large-diameter hot water pipes. Background technique [0002] At present, with the large-scale development of urban construction and central heating in my country, the construction of high-efficiency and energy-saving high-temperature hot water pipe networks is increasing, and the scale of heating pipe networks is increasing. The expansion of the scale of the heating network requires that the diameter of the directly buried heating pipeline be large enough to meet the heating demand of the increasingly expanding heating network. Therefore, in engineering practice, there are many cases where pipes with diameters above DN500 are directly buried. As we all know, when the temperature of hot water in the pipeline increases or decreases, the steel pipe will expand with heat and contract with cold. When installi...

AI Technical Summary

Problems solved by technology

There are two main ways to install the compensator. One way is to use a conventional type of compensator and install it in the inspection room. It is necessary to build an inspection room and remove the accumulated water in the inspection room in time to keep the compensator and the end of the insulation pipe free from water. Soaking; Another way is to use direct-buried compensator without building an inspection room, because the function of the compensator is to absorb the deformation of the pipeline, the pipeline and insulation structure must be disconnected where the compensator is installed, and the groundwater will contact the metal part of the compensator to cause corrosion , it is not easy for operating personnel to check and find equipment failures in time

[0006] Since the life of the compensator is much shorter than that of the steel pipe, there are many hidden dangers of accidents when the pipeline is directly buried with compensation. Frequent maintenance and replacement of the compensator are required, and the project investment and operation and maintenance costs are high.

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