Segmented hole-sweeping and retreating controlled grouting equipment for avoiding grouting walls

Abstract

Segmented hole sweeping type retreating controllable grouting equipment free of a grout-preventing wall comprises an orifice pipe. One end of the orifice pipe is connected with a disc through a fast flange joint. A grout inlet pipe and a grout outlet pipe are arranged on the side, away from the orifice pipe, of the disc. The grout inlet pipe is connected with a cement slurry pipe and a controlling liquid pipe through a slurry mixer. The slurry mixer is capable of adjusting the mixing ratio of cement slurry to controlling liquid. A valve is installed on the grout outlet pipe. Both the grout inlet pipe and the grout outlet pipe communicate with the orifice pipe. A grout injection pipe is arranged inside the orifice pipe. One end of the grout injection pipe communicates with the grout inlet pipe. The length of the grout injection pipe is larger than the length of the orifice pipe. Both the cement slurry pipe and the controlling liquid pipe are provided with one-way valves. Since the grout-preventing wall does not need to be arranged, the problems that the existing grouting process is long in construction time and high in cost due to arrangement of the grout-preventing wall can be solved. The phenomenon that slurry overflows on the rock surface due to the development of fissures around the orifice pipe can be avoided, and grouting pressure is guaranteed.

Description

technical field [0001] The invention relates to a tunnel surrounding rock grouting construction technology, in particular to a controlled grouting equipment which prevents the grout wall from segmental sweeping and retreating. Background technique [0002] With the construction of large-scale infrastructure such as highways and railways, more and more tunnel projects are being built under complex geological conditions. When carrying out tunnel and underground engineering construction under such complex geological conditions, blasting or manual excavation will disturb the surrounding rock, change the flow state of groundwater, destroy the original mechanical state of the surrounding rock and the balance system of groundwater, and easily cause tunnel damage. Disasters such as internal collapse, mud inrush, and water gushing will cause immeasurable delays in the construction period and endanger the safety of personnel and equipment. At present, the commonly used method of stra...

AI Technical Summary

Problems solved by technology

At present, the commonly used domestic tunnel advance curtain grouting reinforcement mostly adopts concrete grout-stop wall to stop grouting. The drilling rig makes holes many times. The material adopts cement single slurry or cement-sodium silicate double slurry. The disadvantages of this process are: The grout wall has many construction procedures, long construction period and high cost. If it is a cylindrical or spherical concrete grout stop wall, the construction will be more complicated; Unable to enter the formation, the grouting effect is difficult to guarantee; third, the ratio of double grout is not easy to control, and the grouting pipe is easy to block

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