High water pressure soft soil stratum HFE combined type shield starting method

Abstract

The invention relates to the field of shield construction, in particular to a high water pressure soft soil stratum HFE combined type shield starting method. The technical problem of receiving of starting of a soft soil stratum shield tunneling machine under a condition of high water pressure is solved. The shield starting method comprises the following steps that rotary jetting reinforcing is constructed according to design drawing requirements; freezing pipes and temperature measuring holes are constructed, temperature measuring lines are arranged, and freezing is conducted after freezing equipment and a freezing pipeline are mounted and debugged; shield starting preparation is conducted; the outer portion of a door opening steel ring is connected with an externally connected steel ringdevice through a bolt; after shield starting preparation work is completed and freezing and reinforcing are conducted, a door opening fencing structure is broken and removed; the shield tunneling machine jacks and marches forwards; pressure buildup is conducted on a working face of the shield tunneling machine; the freezing pipe in a tunneling outline is pulled and removed, and other freezing pipes continue to work and conduct freezing; an arc-shaped plate is welded to the outer vertical face of the externally connected steel ring device, after the shield tunneling machine completely enters the externally connected steel ring device, synchronous grouting is started, and starting tunneling is completed. The high water pressure soft soil stratum HFE combined type shield starting method has obvious advantages when being particularly applied to a soft soil stratum which is high in waterhead, large in water yield and not equipped with a starting rainfall condition, and has good popularization prospects.

Description

technical field [0001] The invention relates to the field of shield tunneling, in particular to a starting method for HFE combined shield tunneling in high water pressure soft soil strata. Background technique [0002] In recent years, my country's rail transit has developed rapidly, and various places have chosen this clean, comfortable, and fast large-capacity transportation tool to solve the problem of urban congestion. Due to the huge scale of planned routes and various construction projects, the shield tunneling method has become the most commonly used interval tunnel construction method due to its safety, high efficiency and strong adaptability. [0003] With the maturity of shield construction technology and the accumulation of construction experience, its safety performance has gradually improved, but the launch and reception of shield tunnels are still the biggest risk points in shield construction. Flooding shield machines, stations, and intervals will cause great ...

AI Technical Summary

Problems solved by technology

[0003] With the maturity of shield construction technology and the accumulation of construction experience, its safety performance has gradually improved, but the launch and reception of shield tunnels are still the biggest risk points in shield construction. Flooding shield machines, stations, and intervals will cause great economic losses and endanger personnel safety. In the water-rich soft soil area near the river, the groundwater level is high, the underground pore water is rich, the self-stabilization ability of the surrounding rock and soil is poor, and the soft soil cutterhead It does not have the ability to break the underground diaphragm wall, and it needs to manually break the underground diaphragm wall of the portal, and the risk of origination and reception is particularly prominent

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