Method for removing pile foundation intruding in shield tunnel range and controlling parameters

Abstract

The invention provides a method for removing a pile foundation intruding in a shield tunnel range and controlling parameters. The construction method comprises the following specific steps that firstly, an inclinometer is embedded into a central lead hole of the pile intruding in the range, plain concrete positioning piles are constructed around the pile intruding in the range, after the positioning piles are constructed to have the height reaching 1/3-1/2 of the height of the pile intruding in the range, backfilling is conducted, and jet grouting piles are constructed on the areas of the upper portions of the positioning piles; secondly, ground installation of a protection sleeve on the top of the pile intruding in the range is conducted, and then the pile intruding in the range can be removed by using a pile jetting method. After a pile body is removed, an impact hole is backfilled with concrete to form a displacement pile, and when shield excavation is conducted to pass through theplain concrete pile, targeted regulation of the specific excavation parameters is conducted; according to the ground surface settlement monitoring situation, WSS is adopted to track grouting, fillingof an underground sunken soil mass is conducted in time, and it is ensured that the ground is stable. The method has the advantages of being good in construction effect and convenient to implement, the pile foundation intruding in the tunnel range is effectively helped to be removed by jetting, and the risk that in the shield construction process, a cutter disc is wound and tightened by steel barsis avoided.

Description

technical field [0001] The invention aims at the field of urban rail construction, and specifically relates to a pile foundation cleaning and parameter control method within the scope of a shield over-invasion tunnel. Background technique [0002] With the continuous development of my country's national economy and urban transportation construction, the country has set off a climax of underground rail transit construction. Within the scope of subway planning and construction, it is impossible to completely avoid underground reinforced concrete pile foundations, and the buried depth of subway tunnels is relatively shallow. It will cause the reinforced concrete pile foundation to intrude into the tunnel area. Most subway tunnels are constructed by the shield method. If the shield directly cuts and invades the pile foundation, it is easy to cause the pile foundation steel bar to wrap around the shield machine cutter and continue to bypass the surrounding soil or even lock the sh...

AI Technical Summary

Problems solved by technology

However, in the process of flushing out the reinforced concrete pile foundation by the punching pile method, the hammer of the punching pile driver is likely to push the broken steel bar into the soil around the limit pile and stay in the tunnel range, and there are still shield machine blockages, Therefore, in order to ensure the smooth removal of intrusion piles, it is very necessary to study a method of removing pile foundations within the scope of shield tunneling.

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