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Weak surrounding rock auxiliary gallery small pilot tunnel crossing main tunnel roof brushing construction method

A technology for assisting tunnels and weak surrounding rocks, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of easy collapse of tunnels, reduce costs, etc., and achieve the effect of saving temporary support costs

Inactive Publication Date: 2015-02-04
CHINA RAILWAY 16TH BUREAU GRP CO LTD
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Problems solved by technology

[0004] Aiming at the problem that the conventional bottom-up roofing method in the above-mentioned related technologies is not suitable for the roofing of the main tunnel under the condition of weak surrounding rock, the present invention proposes a construction method for the roofing of the main tunnel with the auxiliary tunnel and small pilot tunnel crossing the main tunnel under the condition of weak surrounding rock , can avoid the risk of the tunnel top collapsing easily when constructing intersections in weak surrounding rock geological sections, and does not require a large number of temporary supports, reducing costs

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  • Weak surrounding rock auxiliary gallery small pilot tunnel crossing main tunnel roof brushing construction method

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Embodiment Construction

[0036] 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. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0037] Such as figure 1 As shown, a kind of soft surrounding rock auxiliary tunnel small pilot tunnel crossing the main tunnel roofing construction method described in the embodiment of the present invention includes the following steps:

[0038] Step 1: Construction preparation, including:

[0039] Step 1-1: Adjust the intersection angle between the flat slope section of the auxiliary tunnel and the main tunnel so that its longitudinal centerline is at a 90° angle to the centerline of the m...

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Abstract

The invention discloses a weak surrounding rock auxiliary gallery small pilot tunnel crossing main tunnel roof brushing construction method. The method comprises the following steps: (1) preparing for construction; (2) constructing an advance support of the small pilot tunnel; (3) excavating the small pilot tunnel in two steps after the advance support of the small pilot tunnel is finished; (4) performing combined support by using a steel frame, a system anchor rod, a reinforcement mesh and concrete after the excavation of the small pilot tunnel is finished; (5) timely constructing an upper primary support of the main tunnel when the small pilot tunnel is constructed to an arch springing outer side line on the other side of the main tunnel; (6) performing excavation support on the middle part and the lower part of the main tunnel. The method has the beneficial effects that the safety of an auxiliary gallery and fast entry into the main tunnel are guaranteed, the risk of high probability of collapse on the top of the tunnel during intersection construction at a weak surrounding rock geological section is reduced and avoided, the temporary support cost is saved and the construction progress is quickened.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for raising the roof of a small pilot tunnel crossing a main tunnel with an auxiliary tunnel with weak surrounding rocks. Background technique [0002] During tunnel construction, it is common to encounter tunnels with a contract section length greater than 5km. In order to increase the working face, speed up the tunnel construction progress, and improve the drainage and ventilation conditions during tunnel construction, auxiliary tunnels (inclined shafts) are set up. Compared with other sections of the tunnel, the intersection between the auxiliary tunnel and the main tunnel has a relatively weak construction safety link due to its larger cross-sectional space, and the intersection is mostly located in a broken zone with poor diagenesis, serious faults and geological structures. Weak surrounding rock geological section with low surrounding rock strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D11/14E21D20/00
CPCE21D9/00E21D11/00E21D11/10E21D11/14
Inventor 张秀良李庚许徐志平曲炳武马双来曹乾桂张西磊刘金佐柴聪斌陈宾
Owner CHINA RAILWAY 16TH BUREAU GRP CO LTD
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