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

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.

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...

AI Technical Summary

Problems solved by technology

At present, various ground grouting reinforcement methods for river channels 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 control during the crossing process, the subsidence of the stratum soil may be caused by the super square, which may cause the river bottom to subside, crack, and collapse, causing the river water to recharge. Shield Tunnel Construction Brings Hazards

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