Method for constructing directly-buried heat-preservation pipeline passing by marshland section

Abstract

The invention provides a method for constructing a directly-buried heat-preservation pipeline passing by a marshland section. The method comprises the steps that a marshland is filled with coal gangue so that an operation face can be formed, a groove used for enabling the heat-preservation pipeline to be directly buried is dug in the operation face, pebble replacement and filling are conducted on the part of sludge at the bottom of the groove, and a pebble replacement and filling layer allowing underground water to flow through is formed at the bottom of the groove through replaced and filled pebbles; the water level at the bottom of the groove does not exceed the pebble replacement and filling layer and a medium-coarse sand layer is laid between the pebble replacement and filling layer and the laid pipeline; an anchor block foundation ditch is dug in the groove; after the medium-coarse sand layer is dried, the pipeline is installed in the groove, and butt joint welding is conducted on the pipeline; an anchor block is installed in the anchor block foundation ditch and used for fixing the pipeline placed in the groove; after butt joint welding is accomplished, the groove is backfilled. According to the method, the problems that the pipeline bears force in the sludge, the pipeline cannot effectively operate in a normal life cycle, the pipeline floats when water does not pass by, and the pipeline is long in construction period are solved.

Description

technical field [0001] The invention relates to the technical field of direct-buried thermal insulation pipelines, and more specifically, relates to a construction method for direct-buried thermal insulation pipelines passing through swampy areas. Background technique [0002] During the construction of hot water pipelines in heating projects, due to the distance between heating stations and heating communities, hot water pipelines may be relatively long, and some hot water pipelines may even be tens of kilometers long. The area where the hot water pipeline passes has a variety of terrain conditions, and there may be ditches, swamps, mines, etc. For the laying of hot water pipelines in swamp areas in central heating projects, there are mainly two schemes used in the past: [0003] 1. Bypass plan [0004] Due to the need to bypass the swamp area, the length of the pipeline needs to be increased, resulting in problems such as long construction period, high cost, and complica...

AI Technical Summary

Problems solved by technology

[0013] In view of the above problems, the purpose of the present invention is to provide a construction method for directly buried thermal insulation pipelines passing through swamps, so as to solve the problems of bearing capacity of pipelines in mud, effective operation of pipelines in normal life cycle, floating of pipelines when they are not connected to water, and The problem of long pipeline construction period

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