Underground mold bag pile supporting method

Abstract

The invention discloses an underground mould bag pile supporting method. The method includes the following steps that (1), pore-forming is conducted by using a drilling machine to form a mold bag hole, an injection pipe is arranged in the mold bag hole, a grouting outlet hole is formed in the injection pipe, the injection pipe is internally provided with a separator, a mold bag is arranged in themiddle rear section of the injection pipe, at least one grouting outlet hole formed in the injection pipe communicates with the mold bag, a draining pipe is arranged between the rear section of the mold bag and the outer wall of the injection pipe, and the front section of the injection pipe includes a segmented mold bag; (2), first grouting equipment is firstly used for injecting first grout intothe injection pipe to make the mold bag be saturated, then second grouting equipment is used for injecting second grout into the injection pipe, and the second grout flows out of the injection pipe from a front grouting outlet hole; and (3), grouting is conducted on the mold bag hole alternately, and grouting is conducted on a mold bag pile I firstly, and then grouting is conducted on a mold bagpile II after a mold bag I expands fully and achieves certain strength until a mold bag pile supporting wall structure is formed. The underground mould bag pile supporting method has the advantages ofbeing good in stress condition, capable of stopping water, capable of effectively controlling excavation subsidence and the like.

Description

technical field [0001] The present invention relates to a support method for underground mold pocket piles, in particular to a support method for underground mold pocket piles with an air indwelling cavity between the ink supply pipe and the ink jet port The support method of the underground mold bag pile is provided with an air indwelling cavity between the hole and the ink injection port. Background technique [0002] During the excavation of tunnels with weak surrounding rocks, in order to prevent site disasters such as tunnel collapse, water gushing, surrounding rock loosening, and surface settlement, pre-reinforcement construction is required before excavation. At present, the common and mature construction methods for pre-support construction of weak surrounding rock include pipe shed method, pipe curtain method, small pipe advance grouting method, horizontal rotary spraying or mixing method, shield tunneling method, freezing method, etc. Among them, the combination o...

AI Technical Summary

Problems solved by technology

However, due to poor water-stop performance, it is often necessary to use in combination with small conduit advance grouting reinforcement technology

[0004] Disadvantages of the tube shed construction method: the strength of the pile itself is poor, the reinforcement effect on the surrounding rock is poor, and the water-stopping effect is poor. In most cases, it needs to be reinforced with advanced small conduit grouting, but it increases the disturbance to the surrounding rock

However, it has the disadvantages of poor grouting effect and small reinforcement range.

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