Shield underwater oblique crossing hole entering construction method

Abstract

The invention discloses a shield underwater oblique crossing hole entering construction method which includes the following steps: using a saline freezing method to conduct soil body freezing strengthening at the position of a hole door, manufacturing a receiving foundation, conducting underground diaphragm wall tunneling at the position of the hole door and hole door ring installation, wherein the tunneling comprises first tunneling and second tunneling, receiving in-well water and soil backfill, defrosting frozen soil, pulling out a freezing pipe, conducting shield tunneling machine hole entering advancing, receiving well sandy soil, conducting water cleaning, plugging soil bodies around the hole door, and disassembling and transferring a shield tunneling machine. The shield underwater oblique crossing hole entering construction method can be suitable for various working conditions that soil layers have unfavorable geology, a pressure bearing water head is high, and the condition for reducing the pressure bearing water is not met, be suitable for the poor construction environments which are complex in neighboring environment, short in distance between pipes and building groups and large in number of the pipes and the building groups, and be suitable for narrow fields where a receiving well cannot be strengthened with sufficient conditions.

Description

technical field [0001] The invention relates to tunnel engineering, in particular to the oblique tunnel entry construction technology of underwater shield tunneling. Background technique [0002] When the shield tunnel is on a small curvature radius curve, there is a certain horizontal inclination angle between the tunnel axis and the receiving shaft wall (underground diaphragm wall) when entering the tunnel. There is a greater risk of water and sand gushing in the construction of shield tunneling in the state. [0003] The construction technology of shield tunnel entry and exit must be formulated according to the soil quality, hydrology, environmental conditions and environmental protection requirements of the stratum where the project is located. How to scientifically and rationally use various access and exit technologies to meet the requirements of specific working conditions of each project is a subject worth studying and discussing. [0004] Among them, projects usin...

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Problems solved by technology

[0002] When the shield tunnel is on a small curvature radius curve, there is a certain horizontal inclination angle between the tunnel axis and the receiving shaft wall (underground diaphragm wall) when entering the tunnel. There is a greater risk of water gushing and sand gushing in the construction of shield tunneling in the state

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