Construction method of adjacent underground pipelines during open caisson sinking construction

Abstract

The invention provides a construction method of adjacent underground pipelines during open caisson sinking construction. The method includes the following steps that settlement marks are arranged on the tops of the existing adjacent underground pipelines; inclinometers are welded to the inner walls of steel pipe piles; jet grouting pile isolation wall construction is carried out; grouting pipes are manufactured, the grouting pipes are manufactured from galvanized steel pipes, grouting holes are drilled in bodies of the grouting pipes, and the grouting holes are wrapped by rubber; the groutingpipes are obliquely inserted into soft soil mass below the underground pipelines through drill holes; drainage sinking is adopted at the early stage of open caisson construction, and undrainage sinking is adopted at the later stage of open caisson construction; the inclinometers are used for monitoring the displacement of a composite jet grouting pile isolation wall, settlement of the undergroundpipelines is monitored through the settlement marks, and if the situation of horizontal displacement or excessive settlement exists in the open caisson process, the grouting pipes on the side edges ofthe underground pipelines are used for grouting reinforcement of the underground pipelines; the deformation condition of the underground pipelines is closely monitored in the grouting process, and the situation that the underground pipelines are affected by too high grouting pressure is avoided; and after open caisson construction is completed, Larson steel plate piles and the steel pipe piles are pulled out.

Description

technical field [0001] The invention belongs to the field of caisson construction, and in particular relates to a construction method for adjacent underground pipelines during caisson sinking construction in soft ground. Background technique [0002] With the development of urban underground space, caisson construction has been more and more widely used in the construction of subways, municipal pipelines and other projects. The caisson is not only a deep foundation, but also a special construction method. Separate enclosures can meet the specific functional requirements of the underground space. The urban underground pipeline system is intertwined and complex, and the sinking construction of caissons often encounters the situation of adjacent existing underground pipelines. [0003] During the sinking process of the caisson, the surrounding soil will be disturbed, and a certain range of subsidence will be caused around the caisson, forming a settlement trough. Different se...

AI Technical Summary

Problems solved by technology

Different settlement differences in the width range of the settling tank will cause disturbance and even damage to the adjacent underground pipelines within the settling tank range, which is very harmful

At the same time, the construction of large-depth caisson sinking in soft soil stratum itself has high risks.

The caisson is huge in size, difficult to manufacture, high in sinking control requirements, and difficult to control

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