Ultra-shallow-buried rectangular large section four-step underground excavation construction method

Abstract

The invention relates to an ultra-shallow-buried rectangular large section four-step underground excavation construction method. The method is characterized in that a whole section is divided into six blocks on a rectangular large section, the six blocks are constructed in four steps according to up-down division and left-middle-right division, specifically, the upper left area and the upper right area are constructed in the step 1, the upper middle area is constructed in the step 3, the lower left area and the lower right area are constructed in the step 2, and the lower middle area is constructed in the step 4; and the whole section is separated into two layers, and all steps of construction are conducted orderly through a step underground excavation method. According to the ultra-shallow-buried rectangular large section four-step underground excavation construction method, the number of the excavation steps and the number of temporary supports are small, the structure is stable and safe, and the efficiency is high; and the construction progress can be effectively accelerated, and cost investment can be effectively reduced.

Description

technical field [0001] The invention relates to a four-step submerged excavation construction method for ultra-shallow buried rectangular large section, which is applied in the construction of underground spaces, subways, tunnels, etc. in urban central areas. Background technique [0002] The underground space and railway tunnels built in the urban center area in my country are mainly constructed by the full-section method, the small pilot pit blasting method, the partial excavation method, and the half-section arc pilot pit method. The construction of underground space and tunnels in urban central areas under complex conditions cannot be completed by a single construction method, but a combination and variation of several methods. The choice of construction method should not only consider the engineering geological conditions, geometric characteristics of the tunnel (height, width, length, longitudinal slope and minimum curve radius), construction conditions, groundwater co...

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Problems solved by technology

Due to the large number of blocks, more temporary supports are required, and the construction cost is relatively large, and because of the large number of blocks, the construction of each step interferes greatly with each other, and the construction progress is slow

[0003] In addition, for the shallow buried excavation method in China, there is still a lack of relevant theories on the degree of action of dynamic loads such as automobiles and pedestrians and the influence of adjacent structures. Therefore, it is necessary to develop a method that can speed up the construction progress and save temporary Construction methods that support cost input

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