Construction method of enclosing level rotary-jet pile hole-mouth using double-liquid slip jection method

Abstract

A construction method for sealing the hole of a horizontal jet-grouting pile by double-fluid grouting method, comprising the following steps: 1) drilling a hole in a retaining wall; 2) installing a steel sleeve with a group of water-stop valves on the outer side of the retaining wall The steel casing has three valves: the first valve is installed at the bottom of the steel casing; the second valve is installed at the top of the steel casing above the first valve; the third valve is installed between the first valve and the second valve Outside; 3) Drilling construction: close the second valve, open the third valve, insert the drilling rotary spraying composite pipe into the orifice; open the first valve; 4) rotary spraying construction; 5) orifice plugging: rotary spraying ends After pulling out the rotary nozzle, close the first valve and the third valve; 6) pour water into the glass; open the second valve, insert the grouting pipe from the second valve, and inject the water glass; 7) check the hardness. The invention requires only a small amount of equipment, and the construction method is simple and reliable, the construction speed of the orifice sealing is doubled, and the strength of the orifice is increased by more than 50%.

Description

technical field [0001] The invention relates to a construction method used in the technical field of tunnel engineering, in particular to a construction method for sealing the hole of a horizontal jet grouting pile by using a double-liquid grouting method. Background technique [0002] In recent years, due to the continuous deepening of the construction of urban subways, underground passages, and cross-river tunnels, it is necessary to reinforce the soft soil foundation underground on the excavation surface. In this way, the horizontal jet grouting reinforcement construction technology based on the vertical jet jet technology came into being. The construction of the horizontal rotary spraying method can be carried out in the deep underground that the vertical rotary spraying method cannot reach (such as large depth underground, building obstacles on the ground, etc.), which expands the scope of use of the rotary spraying method. At the same time, the horizontal rotary spray...

AI Technical Summary

Problems solved by technology

Although the horizontal rotary spraying has been applied to practical projects for many years at home and abroad, the problem of water-tight sealing of the orifice has not been well solved.

However, there is no practical method for the treatment of the outflow of drilling water and groundwater during drilling, and the discharge of excess mud during the rotary spraying process.

In addition, it is very inconvenient to drive wooden piles in the small underground construction space, and it is difficult to operate the wooden piles and driving equipment underground, which is very uneconomical and reasonable

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