Wall-for-grouting-free segmentation drill-hole-cleaning retrogressive controllability grouting method

Abstract

The invention discloses a wall-for-grouting-free segmentation drill-hole-cleaning retrogressive controllability grouting method. The method is characterized by comprising the first step of using a drilling machine to drill a shallow hole with the depth being 2.5m-3.0m on original wall rock, and stopping a drill rod; the second step of taking an orifice pipe of which the pipe opening is provided with a flange quick connector, and using cement grout to lay the pipe opening on the surface of a hemp thread wrapping layer; the third step of taking a disc which is matched with the flange quick connector on the orifice pipe in the second step, and installing a slurry inlet pipe and a slurry outlet pipe on one side of the disc, wherein a slurry injection pipe is communicated with the slurry inlet pipe; the fourth step of making the orifice pipe which is twined by hemp thread and is laid with the cement grout in the second step enter the shallow hole in the first step in an abutting mode, so that the flange quick connector in the end of the orifice pipe is 30 cm away from rock face. According to the wall-for-grouting-free segmentation drill-hole-cleaning retrogressive controllability grouting method, a wall for grouting does not need to be arranged, and the phenomenon that the grout spills out of the rock surface due to fracture development in the periphery of the orifice pipe can be completely eradicated; meanwhile, by varying the state of the grout and combining segmentation drill-hole-cleaning retrogressive, the good effect of grouting in the position of a deep hole and the like can be achieved.

Description

technical field [0001] The invention relates to a tunnel surrounding rock grouting construction technology, in particular to a controlled grouting method which prevents the slurry 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 stratu...

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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; It is difficult to guarantee the grouting effect if it cannot enter the formation; thirdly, the ratio of double grout is not easy to control, and the grouting pipe is easy to block; fourthly, due to the water pressure in the hole and the setting time of the grout, the grouting effect at the deep hole position is poor

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