Application of WSS construction method in shield end reinforcement of water-rich sand layer

Abstract

It provides an application of WSS construction method in the tool change reinforcement of water-rich sand layer shield. The grouting process of WSS construction method adopts tunnel drilling machine for deep hole grouting reinforcement. The slurry is used to drain the soil and improve the impermeability of the soil; when the entire reinforced body is completed using the solution-type grout composed of liquid A and liquid B, after the retreat grouting construction is completed, the suspension composed of liquid A and liquid C is used to Type grout forward grouting for soil consolidation, changing the physical properties of the original soil and improving the compressive strength of the soil, and finally making the weak soil layer (mainly sandy, gravel clay and sand layer) become impermeable Soil with high resistance, high compressive strength and high stability, so that it is easy to open the warehouse for inspection and replace the tool.

Description

technical field [0001] The invention relates to the shield technology, in particular to the application of a WSS construction method in the reinforcement of the end of the shield in the water-rich sand layer. Background technique [0002] The traditional shield end reinforcement methods include stirring pile method, rotary spraying pile method, stirring + rotary spraying pile method, SMW pile method, sleeve valve pipe grouting method, manual hole digging pile method, etc. The more commonly used reinforcement methods are stirring pile method Pile method, rotary spray pile method, mixing + rotary spray pile method. For water-rich sand layers, the most commonly used method is the jet jet pile method. [0003] In the construction of Longjing Station in the shield section of Shenzhen Metro Line 7 7301-1 undertaken by our company, the original design plan was to use single-row double-pipe jet grouting piles ￠600@450 for reinforcement. The reinforcement range and depth of penetrat...

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Problems solved by technology

[0007] 3. Judging from the current situation of shield tunneling on Shenzhen Metro Line 7, the use of high-pressure rotary grouting piles for reinforcement will cause a large amount of water and mud gushing, and the risk is relatively high

[0008] 4. The cost is high, the verticality deviation control of the pile driver is difficult, the water stop control between the piles is poor, and it is not suitable for the upper soft and lower hard strata

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