Construction method for penetrating through large-scale vertical karst cave group tunnel

A tunnel construction and karst cave technology, which is applied to tunnels, tunnel linings, shaft equipment, etc., can solve the problems of long treatment process, high consumption of manpower and material resources, and difficult construction, so as to eliminate the hidden danger of high-pressure karst water and shorten the construction period , The effect of saving materials

Active Publication Date: 2017-07-28
THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method for crossing large-scale vertical karst cave group tunnels. In the construction of large-scale vertical karst cave group tunnels, small machinery, concrete delivery pumps and other equipment can be used to car...

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  • Construction method for penetrating through large-scale vertical karst cave group tunnel
  • Construction method for penetrating through large-scale vertical karst cave group tunnel

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Embodiment Construction

[0020] The present invention will be further described below in combination with specific embodiments.

[0021] A construction method for tunnels passing through large vertical karst cave groups, the specific implementation steps are as follows:

[0022] Step 1. Remove the dangerous rockfall existing locally on the rock wall of the karst cave, and use sprayed C20 surface protection concrete 1 for protection, expand and excavate the section at the vertical karst cave entrance as a working channel, and later use it as an inspection cave.

[0023] Step 2. The large-scale vertical karst cave group adopts backfill-based treatment measures. For the platform above the vertical karst cavity about 48m above the tunnel face, C20 backfill concrete 3 is used for pouring and backfilling, and the water passage 9 is reserved, and the backfilling concrete 3 is poured. Anchor rods 2 are embedded in the rock mass before the surrounding rock walls to increase the integrity of the backfill concre...

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Abstract

The invention discloses a construction method for penetrating through a large-scale vertical karst cave group tunnel. A technical measure of backfilling concrete to reserve a water passing channel is adopted for a large-scale vertical karst cave group, by strengthening support of a steel arch frame and a pipe shed for a karst cave section, a reinforced concrete beam plate structure is adopted to span on a karst cave section tunnel bottom, the bearing capacity of foundation is greatly improved, municipal bellows are pre-embedded into circumferential cracks of the vertical karst cave group and an arch karst cave before backfilling the concrete and are led to the water passing channel, the hidden danger of high-pressure karst water due to long-term water accumulation is eliminated, and the construction period and the security of future operation period are ensured. The construction method for penetrating through the large-scale vertical karst cave group tunnel is convenient to construct, the construction period is greatly shortened, the treatment filling effect of the karst cave is improved, the safety of subsequent construction is improved, material filling and the construction method are simple and convenient and without special requirements, and good use effect of field construction is obtained.

Description

technical field [0001] The invention relates to a construction method for tunnels passing through large vertical karst cave groups, and belongs to the technical field of karst tunnels for processing large vertical karst cave groups. Background technique [0002] For tunnels passing through large-scale vertical karst cave groups, large-scale karst caves with a depth greater than 30m, the filling scheme is generally adopted, and the subgrade form is used to pass through. The karst cavity around the tunnel is backfilled with conventional full-fill slag or M7.5 masonry rubble. The amount of material used is huge and cannot be transported to the working face. The amount of machinery used is large, the construction period is unpredictable, and the construction cost and safety risks are extremely high. Guaranteeing the construction period greatly increases the difficulty of on-site processing. Contents of the invention [0003] The technical problem to be solved by the present i...

Claims

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Application Information

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IPC IPC(8): E21D9/14E21D11/00E21D11/10E21D13/00E21D13/02E21F16/02
CPCE21D9/14E21D11/00E21D11/10E21D13/00E21F16/02Y02E10/20
Inventor 杨炎川陈金张登林吴秀雄魏毅宋佳蒋志权解振乙
Owner THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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