Mold bag grouting method and device for quickly and uniformly reinforcing soft stratum

Abstract

The invention belongs to reinforcement and improvement technology of soft surrounding rocks of tunnels and underground engineering, and mainly provides a mold bag grouting method and a mold bag grouting device for quickly and uniformly reinforcing a soft stratum. The device is provided with a primary grouting unit and a secondary grouting unit; the pipe wall of a grouting pipe (1) of the secondary grouting unit is provided with a plurality of slurry outlets (2), a mold bag (3) is sleeved on the grouting pipe (1) of the secondary grouting unit, and two ends of the mold bag are hooped on the grouting pipe; a pre-tightening unit consisting of a cushion plate (7) and a nut (8) is sleeved on the grouting pipe (1) of the secondary grouting unit at the orifice position, and the other end of the grouting pipe (1) of the secondary grouting unit is connected with a secondary grouting pipeline through two ball valves; and the primary grouting unit is provided with a grouting device consisting of a double-bag grouting plug (14), a primary grouting unit slurry conveying steel pipe (17) and a hand pump. The method and the device can realize quick and uniform reinforcement of the soft surrounding rocks, improve the physical and mechanical indexes of the soft surrounding rocks, increase the stability of the soft surrounding rock, meanwhile, realize region controlled grouting and avoid slurry loss.

Description

technical field [0001] The invention belongs to the reinforcement and improvement technology of the weak surrounding rock of tunnels and underground engineering, and mainly proposes a method and device for grouting in a mould bag for fast and uniform reinforcement of weak ground. Background technique [0002] Tunnel and underground engineering construction in soft strata, especially soil layers, often cause stratum loss due to excavation, large deformation or collapse of surrounding rock, seriously endangering the safety of construction personnel and equipment, and excessive surface subsidence caused by stratum loss, resulting in The damage to the surrounding environment will seriously affect the normal production and life of residents. In order to ensure the safety of construction and minimize the impact of construction on the environment, grouting reinforcement methods, including rotary jet grouting, pipe shed grouting, and small pipe grouting, are often used at home and a...

AI Technical Summary

Problems solved by technology

In the traditional grouting reinforcement, the diffusion of grout in the formation is random and dispersed, it is difficult to realize controlled area grouting, and the loss of grout is large, so it is impossible to achieve uniform reinforcement of the formation. In addition, due to the grouting reinforcement construction The cycle is long and the economy is poor, which seriously affects and restricts the construction period and is not conducive to the stability of the surrounding environment

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