Integral open-excavation node top-down underground engineering construction method

Abstract

The invention discloses an integral open-excavation node top-down underground engineering construction method. The method combines the characteristics of an open-excavation sequential construction method and a covered top-down excavation method. On one hand, the invention provides the underground engineering construction method including local top-down elements in the integral open-excavation sequential construction engineering; the method has the characteristics of convenient and rapid construction, low difficulty and excellent quality of the open-excavation sequential construction method, and also has the safety of the top-down excavation method; temporary support operation and detachment can be reduced greatly, the investment is saved, the principles of energy-saving, environment-friendliness, and green building are embodied; on the other hand, reliable top-down node schemes and technical measures are provided; the node part structure and waterproof quality are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and relates to a construction method of an underground structural engineering, in particular to an underground engineering construction method of integral open-cut joint inversion. Background technique [0002] With the continuous development of urban modernization, the requirements for the development and construction of three-dimensional urban space are becoming more and more urgent, and there are more and more constructions of various underground projects. The construction methods of large-scale underground projects mainly include cut-and-open method, cover-excavation method and so on. The method of open cut is to firstly excavate all the rock (soil) in the underground engineering part, then build the underground engineering, and then carry out the construction method of backfilling. Cover-excavation is a construction method that first constructs the piles and roof of the unde...

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Problems solved by technology

[0003] The surface excavation method has the advantages of convenient and fast construction, low difficulty, good quality, and easy guarantee of waterproof effect; but improper control can easily cause deformation of the surrounding soil and surface settlement. For large-scale projects, a large number of concrete support systems need to be installed, and there are many temporary projects. Large amount, and if support switching is required, the construction period and the number of temporary works will be significantly increased

Cover-excavation construction can effectively control the deformation of the surrounding soil and surface settlement, effectively protect the surrounding environment, improve the safety of construction, and realize the organic combination of permanent structure and temporary structure. Generally, there is no internal support or anchor, saving The cost of temporary works; however, it is difficult to deal with the horizontal construction joints of the concrete lining wall, and it is difficult to guarantee the waterproof effect; it is inconvenient to excavate and feed materials, the construction is difficult and the cost is high

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