Method for reinforcing sludge sand layer

Abstract

The invention provides a method for reinforcing a sludge sand layer. The method comprises the following steps that S1, a drill bit part of a stirring drilling machine drills towards the sludge sand layer, in the drilling process, stirring blades are opened and stir the sludge sand layer, meanwhile, grouting equipment sprays cement grout into the sludge sand layer through a grout inlet hole, a liquid injection cavity of a drill rod and a grouting hole, and the cement grout and the sludge sand layer are mixed and condensed into a cement reinforcing body; S2, the drill bit part retreats from the sludge sand layer, in the retreating process, the stirring blades are retracted, and meanwhile, the cement grout provided by the grouting equipment is sprayed into a hole drilled by the drill bit part through the grouting hole and blocks the hole; S3, the stirring drilling machine is moved to the next to-be-reinforced position, and the steps S1 and S2 are repeated; S4, a re-reinforcing hole is drilled in the cement reinforcing body, and a long anchor pipe is inserted into the re-reinforcing hole; and S5, the cement grout provided by the grouting equipment is grouted into the re-reinforcing hole through the long anchor pipe and permeates into gaps of the cement reinforcing body.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for reinforcing muddy sand layers. Background technique [0002] The silty sandy soil layer is a unique soil structure in the coastal beach landform area. It is difficult and risky to carry out building construction on this foundation. Because the groundwater in the site area is rich and the upper rock layer and soil layer have strong water permeability, the groundwater in the site area and the soil layer are relatively strong. Sea water has a certain connection with water conservancy. During the excavation of the foundation pit, mud gushing, local collapse, and quicksand often occur, which not only greatly increases the safety risk of foundation pit excavation and the risk of slope instability, but also It also has a huge impact on the development speed of the project. Therefore, the reinforcement of the silty sand layer is a very important measure before the excavation...

AI Technical Summary

Problems solved by technology

[0002] The silty sandy soil layer is a unique soil structure in the coastal beach landform area. It is difficult and risky to carry out building construction on this foundation. Because the groundwater in the site area is rich and the upper rock layer and soil layer have strong water permeability, the groundwater in the site area and the soil layer are relatively strong. Sea water has a certain connection with water conservancy. During the excavation of the foundation pit, mud gushing, local collapse, and quicksand often occur, which not only greatly increases the safety risk of foundation pit excavation and the risk of slope instability, but also It also has a huge impact on the development speed of the project. Therefore, the reinforcement of the silty sand layer is a very important measure before the excavation of the foundation pit. Currently, the commonly used treatment methods include concrete pouring pile method, deep mixing pile method, high pressure Rotary spray pile method, SMW construction method, etc. These methods not only consume a large amount of resources, such as cement, steel bars, etc., but also have a long construction period. A fast-response and fast-handling silty sand reinforcement method

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