Construction method for open dredging and underground excavation integral lining

Abstract

The invention discloses a construction method for open dredging and underground excavation integral lining. The construction method comprises the following steps of S1, temporarily stopping part of railway tracks or occupying highway roads section by section, and adopting rapid pile forming to construct a vertical enclosure; S2, constructing a top plate support to restore the occupied highway roads or the disused railway tracks; S3, repeating the steps S1 and S2; S4, carrying out underground excavation in-tunnel excavation earthwork from the two transverse sides of the highway roads or railwaytracks; S5, leveling the tunnel enclosure and the tunnel roof surface after excavation; S6, performing tunnel waterproofing treatment, binding reinforcing steel bars, and constructing a main body structure; and S7, backfilling earth and rock between the main body structure and the top plate support, and performing grouting through reserved grouting holes after backfilling is completed to ensure backfilling compactness. The construction method avoids the disadvantages of long-time-lane-occupation construction when compared with the existing conventional open dredging construction, overcomes the defects of insufficient initial support rigidity and the must of section-by-section excavation when compared with the conventional underground excavation construction, and improves settlement control performance and safety.

Description

technical field [0001] The invention belongs to the field of underground engineering, and in particular relates to a construction method for making an integral lining with open and dark. Background technique [0002] With the expansion of underground space, there are more and more underpass projects, such as underpass railways or railway yards, conventionally adopt military beam overhead sloping excavation or jacking construction, both of which require long-term occupation of railway sites, It brings great inconvenience to passenger organization and railway operation. [0003] For general underpass roads or roads, military beams 1 are used to erect roads or roads, and grading and excavation 2 are used for construction. The general section is as follows: figure 1 shown. [0004] The underpassing road adopts grading construction or vertical foundation pit construction, and the road needs to be constructed in sections for a long time, occupying the road; the same is true for ...

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Problems solved by technology

[0005] Aiming at at least one of the above defects or improvement needs of the prior art, the present invention provides a construction method of open-cut and concealed integral lining, which avoids the disadvantages of long-term road-occupancy construction compared with the existing conventional open-cut construction Compared with conventional underground excavation construction, it overcomes the shortcomings of insufficient initial support rigidity and the need for subdivision of excavation, and improves settlement control and safety

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