Construction method under complex crossing condition of deep and large foundation pit and shallow-buried tunnel

Abstract

The invention discloses a construction method under a complex crossing condition of a deep and large foundation pit and a shallow-buried tunnel. The construction method comprises the steps that the length and the structural shape of an open excavation section are adjusted; two groups of double spur grades are arranged to provide a deslagging channel for a second underpass, and an open excavation section of the second underpass is excavated; secondary lining construction is arranged in time after the bottom of the open excavation section is seen, and under a basic condition that the secondary lining construction of the open excavation section is met, excavation of hole bodies of underground excavation sections at the two ends is added for synchronous construction; after secondary lining of the open excavation section is completed and the strength meets the requirement, backfilling is conducted immediately, and after the backfilling strength meets the requirement, an underground station body is constructed; a hole is reserved in a triangular area at the front end of the open excavation section as a vertical shaft lifting opening; and after excavation of the hole bodies of two single holes of the underground excavation section is completed, a switching pilot tunnel is excavated at the end of a large-mileage underground excavation section. According to the method, the construction safety and quality can be guaranteed, and the problems that the construction period progress is slow and the cost is high due to "pit-in-pit" and "tunnel-in-pit" construction of a complex cross structure with the upper portion being bright and the lower portion being dark can be solved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method under complex intersection conditions of deep and large foundation pits and shallow buried tunnels. Background technique [0002] In China, the comprehensive development of the underground transportation network has become a major trend in the current situation. In urban areas, roads and tracks are often built at the same time. For the construction of new districts that are not affected by large buildings and structures, open and cut methods are often used for the construction of rail transit stations. Simultaneously carry out the construction of underground tunnels and tunnels to form large-scale and complex upper and lower cross-structure construction operations such as "pit-in-pit and tunnel-in-pit" with "upper light and lower darkness". At present, the cross structures at home and abroad are constructed according to the concept of "first down...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention aims to provide a construction method under complex intersection conditions between deep and large foundation pits and shallow buried tunnels. The "dark" "pit-in-pit, pit-in-tunnel" construction caused the slow progress of the construction period and high costs

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