Soil body micro-disturbance deep stirring device and stirring pile construction method

Abstract

The invention discloses a soil body micro-disturbance deep-layer stirring device and a stirring pile construction method.The soil body micro-disturbance deep-layer stirring device comprises a construction machine and further comprises a steel sleeve and a micro-disturbance deep-layer stirring drill bit which can be connected with the construction machine, and the micro-disturbance deep-layer stirring drill bit is arranged in the steel sleeve; the outer side of the steel sleeve is provided with an external fixing piece capable of being matched and fixed with an external fixing device, and the upper end of the steel sleeve is detachably provided with a connecting part connected with a construction machine. The invention has the advantages that the entering and construction disturbance of common steel sleeve construction machinery can be saved, and meanwhile, the construction cost can be saved and the construction efficiency can be improved by adopting a one-machine dual-purpose mode; mud balls and slurry overflowing are prevented from being generated in mixed slurry, the stirring effect is improved, and the soil body reinforcing capacity is enhanced.

Description

technical field [0001] The application relates to the technical field of soil micro-disturbance deep construction, in particular to a soil micro-disturbance deep mixing device and a construction method for a stirring pile. Background technique [0002] The scarcity of urban land resources makes urban development unable to expand without limit. How to efficiently use urban space to meet people's daily work and study has become an urgent problem to be solved in the construction industry. The addition of buildings and structures adjacent to existing buildings in urban space is one of the important ways to expand urban space. However, the dense existing buildings in the city have strict requirements on the deformation of the foundation pit: the lateral deformation of the deep soil outside the pit meets the first-class protection level, the adjacent buildings (structures) have cracks (if any), and surface cracks outside the foundation pit. (if any) meet the first, second and thi...

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Problems solved by technology

[0003] The conventional construction process of deep mixing piles is as follows: the construction machinery is in place → the drill hole is drilled to the designated position → the drill bit is lifted to spray the slurry and the soil to mix → lift to the ground and repeat the drilling and stirring → the drill bit is lifted to complete the construction. Due to the blade shearing and the structural damage of the surrounding soil during the construction process, the soil is more likely to be disturbed, which will affect the deformation control of the adjacent existing buildings, and even cause the buildings to be unable to continue to be used. bring difficulties

Engineering practice has proved that the above-mentioned types of deep mixing piles cannot effectively reduce the disturbance to the surrounding soil: Taking the IMS construction method as an example, the maximum displacement of the deep soil during the construction process was actually measured at a construction site in Hangzhou. The maximum value is 5mm, and the displacement of the deep soil measured at the end of the construction is within the range of ±3mm

Considering that the influence of disturbance during pile construction is the greatest, it is analyzed that these methods do not meet the requirements of micro-disturbance construction.

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