Horizontal positioning grouting reinforcement construction process suitable for municipal construction muddy soft soil stratum

Abstract

The invention discloses a horizontal positioning grouting reinforcement construction process suitable for a municipal construction muddy soft soil stratum. The horizontal positioning grouting reinforcement construction process comprises the steps that A, drilling machine equipment is arranged on the ground or in a construction well, and the hole opening angle is selected according to the distance between a hole opening point and a target point; B, drilling holes are constructed in the middle of the muddy soft soil layer by adopting a directional drilling technology, and the drilling holes are composed of drilling deflecting section drilling holes and horizontal section drilling holes; C, after drilling construction is completed, installing a grouting sleeve and a grouting valve pipe in the drill hole; and D, injecting grouting materials into the muddy soft soil layer through the drilled holes for reinforcement. According to the process, the stratum loss rate in the municipal shield construction process can be effectively reduced, the stratum loss rate can be reduced to 1% or below, and potential safety hazards such as cracking and inclination of adjacent house structures caused by the fact that a shield downwards penetrates through or laterally penetrates through a building group are effectively avoided; the process can be used for preventing and treating the problems of separation of a ballast bed and a duct piece, tunnel water leakage and the like caused by uneven settlement of a muddy soft soil layer in the subway operation period.

Description

technical field [0001] The invention relates to the technical field of horizontal positioning grouting reinforcement. Specifically, it is a horizontally positioned grouting reinforcement construction technology suitable for silty soft soil formations in municipal construction. Background technique [0002] The main soil layer often traversed by subway tunnel projects is the thick soft cohesive soil layer. The stratum belongs to neritic deposits, gray and gray-black silty clay, in a semi-fluid plastic state, with loose structure, high porosity, and strong water-rich properties. It is difficult to control overbreak during shield tunneling, and the formation loss rate often exceeds the limit. At present, there are two hidden dangers in the construction of subway tunnels in silty soft soil layers: (1) shield tunnels passing through buildings or sideways will easily cause cracking and tilting of the building structure; (2) silty soft soil (underlying Under the influence of long...

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Problems solved by technology

[0003] For this reason, the technical problem to be solved by the present invention is to provide a kind of horizontal positioning grouting reinforcement construction technology applicable to the silt soft soil layer of municipal construction, to solve the problem of the construction of subway tunnels in the silt soft soil layer. The instability of the layer leads to a large loss rate of the layer during the shield tunneling, which leads to safety hazards. At the same time, it can also solve the problems of the track bed and the segment caused by the uneven settlement of the muddy soft soil layer during the operation of the subway, and the tunnel seepage water and other problems.

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