Pipe jacking construction method of municipal gas pipelines

Abstract

A pipe jacking construction method of municipal gas pipelines includes the steps that firstly, measurement and paying-off are conducted; secondly, an open caisson is constructed; thirdly, after the open caisson meets design requirements after maintenance, the open caisson evenly sinks and reaches designed elevation, and open caisson work stops; fourthly, installation of a jacking device and back wall treatment are conducted; fourthly, foot blades are installed, wherein the foot blades are symmetrically arranged at the top ends of sleeves, and each foot blade comprises a shielding plate, a tail plate, a ribbed plate, an annular beam and a fixing frame; sixthly, pipe jacking is conducted; seventhly, crossing pipe sections are welded, and then a reinforcing pipe is arranged on the butt joint of two gas pipelines, wherein the reinforcing pipe comprises an outer pipe and a polypropylene foaming material, the butt joint portion of the two gas pipelines is sleeved with the outer pipe, and the portion between the inner wall of the outer pipe and the outer walls of the gas pipelines in butt joint is filled with the polypropylene foaming material. By means of the foot blades, jacking of the sleeves are benefited, resistance is reduced, and the sleeves do not deviate during jacking and move along the pipelines; structural performance of the joint of the two adjacent gas pipelines in butt joint can be improved.

Description

technical field [0001] The invention relates to the technical field of gas pipeline construction, in particular to a pipe jacking construction method of a municipal gas pipeline. Background technique [0002] The construction of gas pipelines is mainly steel pipelines and PE pipelines. The construction methods used in the gas pipeline system are on-site measurement, on-site processing of pipeline threads, welding or threading, and anti-corrosion or painting operations after completion. The pipe fittings and joints used are all standard parts, which can be modified and manufactured on site according to specific requirements. The main problems are: the welding quality of pipelines on the construction site cannot be monitored effectively, the quality of welds cannot be guaranteed, the number of pipeline joints is large, and there are many potential leakage points, and the pipelines and equipment are heavy and inconvenient to install; the technical level of construction personne...

AI Technical Summary

Problems solved by technology

The main problems are: the welding quality of pipelines on the construction site cannot be monitored effectively, the quality of welds cannot be guaranteed, the number of pipeline connections is large, and there are many potential leakage points, and the pipelines and equipment are heavy and inconvenient to install; the technical level of construction personnel is high. , the installation quality control is difficult; the pipeline is easy to damage the anti-corrosion layer or galvanized layer during transportation and construction; the pipeline has poor corrosion resistance, short service life, and large capital and labor costs for later maintenance, which cannot guarantee the safety of the gas pipeline system sex and reliability

For the butt connection of gas pipelines under special climatic conditions, it is necessary to ensure the performance stability of the interface, and also to increase its strength to ensure that it is not affected by external conditions; the existing gas pipeline butt welding interface is exposed to the outside without protective measures. Often damaged in advance under special climatic conditions

Images