Pile-forming method for cement paste spraying multi-directional core entraining mixing pile

Abstract

The invention provides a pile-forming method for a cement paste spraying multi-directional core entraining mixing pile, which is characterized in that (1) a mixing pile machine is in position and leveled, and a bit aims at a pile position; (2) a drill pipe downward stirs and cuts soil along a guide frame until the designed depth; (3) after the drill pipe reaches the predetermined design depth, concrete are locally and continuously sprayed and stirred at the tip of the pile for more than 10 to 30 seconds; (4) the drill pipe is lifted; (5) concrete spraying is carried out while stirring; the drill pipe is lifted to the surface of earth or the designed elevation to finish the construction of a signal multi-directional mixing pile; (6) the tip of the pile of a core pile passes through a central hole of a jacking pile platform and is inserted into the center of the finished multi-directional mixing pile; (7) after the core pile sinks by self-weight and is penetrated into a certain depth of the mixing pile, the core pile is collated along two directions and the verticality of the core pile is regulated; the core pile is continuously sunken without any unmistakable; and (8) the core pile is pressed by hydraulic static force until the designed appointed depth. The method can realize the synchronous implementation of the mixing pile and the core pile operation, has high working efficiency, convenient construction, and low construction noise; the stress of the pile body is more reasonable and the pile shaft has high strength.

Description

technical field [0001] The invention relates to a building foundation construction technology, in particular to a cement slurry spraying multi-directional cored stirring pile forming method in soft soil foundation treatment. Background technique [0002] Aiming at the problem of soft soil reinforcement, the Ministry of Metallurgical Industry and the Construction Research Institute of my country proposed a deep stirring treatment method in the 1970s. In the 1980s, the single-axis and one-way cement-soil mixing pile machine (commonly known as powder-jet pile machine) jointly developed by the Fourth Survey and Design Institute of the Ministry of Railways and Wuhan Construction Machinery Research Institute was successful in soft soil reinforcement and was recognized by many parties. Over the years, the quality of cement-soil mixing piles has been difficult to control due to reasons such as equipment technology and strata in the application, and often fails to meet the design req...

AI Technical Summary

Problems solved by technology

Over the years, the quality of cement-soil mixing piles has been difficult to control due to reasons such as equipment technology and strata in the application, and often fails to meet the design requirements. Doubts about the depth and reinforcement effect have affected the application of cement-soil mixing piles

[0003] The patent application number is 200810197379.4. The multi-directional multi-axis mixing cement-soil pile machine proposes a multi-directional mixing process. Although it achieves the purpose of uniform mixing, no slurry, and high work efficiency, its disadvantage is that the cement-soil pile has a strong impact on the soft soil layer. The improvement is limited, the strength of the pile body is low, and it cannot meet the requirements for soft foundation treatment of highways and railway subgrades, especially the requirements for post-construction settlement (close to zero settlement) of high-speed railways. If rigid piles such as CFG piles, precast piles, and cast-in-place piles are used for treatment , when a large part of the strength of the pile body material has not yet been exerted, the soil layer around the pile has reached the ultimate bearing capacity, resulting in a waste of pile body materials, and the pile head must be a pile cap, otherwise it is prone to upward penetration damage, and the construction is cumbersome , very uneconomical

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