A reinforcement structure and reinforcement method for shield tunneling in boulder strata to cross rivers

A technology for crossing rivers and reinforcing structures, which is applied in earthwork drilling, mining equipment, tunnels, etc. It can solve the problems of shield tunnel construction hazards, fast penetration of rich water, and low safety, so as to reduce irreversible damage and prevent river water backflow , the effect of shortening the reinforcement length

CN109026022BActive Publication Date: 2020-05-29CHINA RAILWAY 12TH BUREAU GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-05-29

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Abstract

The invention provides a reinforcing structure and reinforcing method for river crossing of boulder and cobble formation shield. The bottom and the inner side of a U-shaped tank box body are supportedby welding of channel steel and section steel keels, a work platform is laid at the top by employing section steel and a walkway plate, the U-shaped tank box body is welded with reserved grouting pipelines vertical to the bottom, one reserved grouting pipeline close to the center of a river channel is provided with a water level monitoring device, a U-shaped grouting pipe is laid on the river bed, then a soft isolation device is laid, later the U-shaped tank box body is arranged in a located manner, accumulated water in a gap between the bottom of the U-shaped tank box body and the soft isolation device is extracted through reserved vertical grouting pipes by employing a small water pump, the gaps between the riverbed and the soft isolation device and between the soft isolation device andthe U-shaped tank box body are filled through grouting by employing the U-shaped grouting pipeline and the reserved vertical grouting pipelines after completion of all the above steps, a sealing effect is produced, and river water is prevented from flowing into a soft isolation layer. According to the structure and method, the usage is simple, and very important reference values and practical meaning are achieved for construction of special geological sections including shield tunnel projects of the same kind and river crossing etc.
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Description

technical field

[0001] The invention relates to a subway shield tunnel construction technology, in particular to a reinforcement structure and a reinforcement method for a shield tunnel crossing a river in a boulder stratum. Background technique

[0002] In recent years, with the continuous improvement of domestic shield tunneling technology, the shield tunneling method has shown strong advantages and has been applied more and more. However, when planning subway lines, it is inevitable that shield tunneling will cross natural canals and river courses. At present, various ground grouting reinforcement methods for river courses have the disadvantages of destroying the original stratum of the river bottom, long construction period, low safety, high cost, etc., and the surrounding environment is complex, making it difficult to implement. However, the boulder stratum has rich water, fast penetration, weak cementation, and poor self-stability. If there is a little careless contro...

Examples

Embodiment Construction

[0026] The present invention is further described below in conjunction with accompanying drawing.

[0027] like figure 1 , 2 As shown, a reinforcement structure for shield tunneling across rivers in drifting pebble strata, including U-shaped trough box (1), U-shaped trough box (1) culvert bottom and inner side welded with channel steel keel (7), The U-shaped trough box (1) and the top of the shaped steel keel (7) are laid with section steel and walkway slabs to lay the work platform (5), and the culvert bottom of the U-shaped trough box (1) is welded with the reserved grouting pipeline perpendicular to the bottom of the trough ( 6), the water level monitoring device (3) is arranged on the reserved grouting pipeline (6), and steel wire mesh, geotechnical waterproof cloth and A soft isolation device (4) composed of colored strips of cloth.

[0028] The U-shaped groove box (1) is a processing and welding tool, which is welded by 5mm thick steel plate + 14 channel steel. The bo...