Construction method of combined protection structure of existing tunnel

Abstract

The invention discloses a construction method of a combined protection structure of an existing tunnel. The construction method comprises the following steps that a top beam and a straining beam are poured above existing fender posts on the two sides of the existing tunnel correspondingly; a grouting reinforcement area is poured on the inner side of the existing fender post; a plurality of vertical shafts are constructed in the grouting reinforcement area to the top plate of the existing tunnel, and coping piers are poured out respectively; uplift piles are constructed on the outer sides of the existing fender posts correspondingly; the outer side of the existing fender post is excavated to the position below the channel foundation pit along the subway in a segmented mode, and connecting beams are poured respectively; channel foundation pits are symmetrically excavated on the two sides of the existing fender posts in a segmented and partitioned mode, and a channel structure is constructed in time and ballasting is carried out; foundation pits between the existing fender posts are excavated in a segmented and partitioned mode, and the existing fender posts are chiseled away; a channel structure is constructed in time and connected with channels on the two sides, and ballasting is conducted according to monitoring data; according to the method, the stability of the existing tunnel is guaranteed, and rapid advancing of earth excavation construction on the upper portion of the subway can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method of a combined protection structure of an existing tunnel. Background technique [0002] With the rapid development of the city, the construction of projects along and around the subway is increasing day by day. It is common to need to build buildings on the existing tunnels, and the earthwork excavation on the upper part of the subway is likely to cause great safety risks to the existing tunnels. How to not only ensure the safety and stability of the existing tunnels in operation, but also ensure the rapid progress of the earthwork excavation construction in the upper part of the subway is an urgent problem to be solved. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and to provide a construction method for a combined protection structure of an existing tunne...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and to provide a construction method for a combined protection structure of an existing tunnel; The problem of rapid progress of excavation construction

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