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Construction method for small-clear-distance four-lane shallow-buried large-span tunnel

A tunnel construction, four-lane technology, applied in the engineering field, can solve the problems of low construction efficiency, long construction period, hidden dangers in construction, etc., and achieve the effect of reducing construction risk, improving construction efficiency, and saving construction period

Active Publication Date: 2015-08-19
SHENZHEN MUNICIPAL DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing shallow-buried long-span tunnel with small clear distance and four lanes has the following technical problems: the structural design is unreasonable, and there are certain hidden dangers in construction; the construction method and process are not standardized, resulting in low structural strength and safety stability of the tunnel
In addition, there are problems such as low construction efficiency, long construction period and high cost.

Method used

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  • Construction method for small-clear-distance four-lane shallow-buried large-span tunnel

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] The construction method of the small clear distance four-lane shallow-buried long-span tunnel in the embodiment is suitable for shallow buried mountain tunnels Grade and similar weak clay strata, because they are relatively broken and similar to soil, reasonable construction steps and support structures can reduce construction risks and improve construction efficiency. Among them: the design parameters of the shallow-buried long-span tunnel constructed acco...

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Abstract

The invention discloses a construction method for a small-clear-distance four-lane shallow-buried large-span tunnel. The construction method comprises the steps: step S10, alternately constructing two tunnels along the longitudinal direction, wherein the alternating distance is not less than 40 m, performing the look-ahead hole long roof pipe, look-ahead grouting small guide pipe and hollow grouting anchor rod operations, grouting the surrounding rock so as to form the composite lining supporting structure; step S20, excavating and supporting the upper half section of the side pilot tunnel; step S30, excavating and supporting the lower half section of the side pilot tunnel, and performing the formworking secondary lining to the side pilot tunnel; step S40, excavating and supporting the upper half section of the intermediate hole chamber; step S50, excavating and supporting the lower half section of the intermediate hole chamber, and performing the formworking secondary lining to the intermediate hole chamber; and step S60, paving the road surface and decorating the wall. The construction method for the small-clear-distance four-lane shallow-buried large-span tunnel is applied for underground-excavating the separated two-hole tunnel in double directions in the V-level surrounding rock with seriously broken rock bodies, satisfying the tunnel construction safety, reducing the construction risk, improving the construction efficiency, and saving the construction period.

Description

technical field [0001] The invention relates to the field of engineering, in particular to a construction method for a small clear distance four-lane shallow-buried long-span tunnel used for two-way underground excavation of a separated two-cavity tunnel in V-level surrounding rocks with relatively broken rock bodies. Background technique [0002] In the prior art, due to considerations of route planning requirements and terrain constraints, it is sometimes unavoidable to adopt tunnels with a small clear distance for traffic routes. The traditional small distance tunnel has the problem of mutual influence between structural safety and construction, and measures must be taken to solve it. Due to the great technical difficulty and risk in the design of a single-hole four-lane tunnel with a small clear distance, it will be very difficult to study the structure of a four-lane shallow-buried long-span tunnel with a small clear distance and to carry out a safe and reasonable four-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D11/38E21F16/02
CPCE21D9/00E21D11/003E21D11/105E21D11/38E21F16/02
Inventor 刘建国王文通吴永照王建新丁华兴彭琦陈鸿许华林
Owner SHENZHEN MUNICIPAL DESIGN & RES INST
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