Given-force engineering method for multisection expanded head discrete material pile composite foundation

Abstract

The invention relates to a given-force engineering method for multisection expanded head discrete material pile composite foundation, and is applied to ground reinforcement on weak or defective foundation soil, and used for forming multisection expanded head discrete material pile composite foundation by virtue of given-force action produced by rammering, extruding, impacting, rammering and expanding. A given-force variable stiffness rammering and expanding pile machine is adopted for forming the multisection expanded head discrete material pile, a pile pipe is compacted and submerged into a soil layer to form a pile hole under the action of dynamic stress, then a doping material is added in the pile hole in sections, the doping material is a discrete material, compacting and chambering are carried out according to a designed given position namely below the pile pipe to form a predetermined first expanded head, batch charging, rammering and expanding are continuously carried out section by section, thus a first discrete material pile section provided with expanded head is made; given-force action is applied to reinforced soil body in a pile forming process for multiple times; each expanded head-pile section pile making process is repeated to form a flexible pile provided with multiple sections of expanded heads; and sequentially, a machine is moved to repeat the power pile-forming process. The engineering method provided by the invention can be applied to new construction and pathological accident handling project.

Description

technical field [0001] The invention belongs to the category of weak ground treatment in the field of ground foundation engineering. In particular, the pre-stressing method involving pile foundations is especially suitable for the reinforcement of soft or poor foundation soils such as soft clay with interlayers, loose silty sand, plain fill, miscellaneous fill, and collapsible loess foundations. Background technique [0002] There are hundreds or even thousands of foundation treatment and reinforcement methods at home and abroad. For the reinforcement of the above-mentioned weak soil layers or loose and poor foundations, the traditional treatment method is a single treatment method. According to its reinforcement treatment mechanism, it generally includes replacement method (also known as replacement method), densification method, drainage method, cementation method, reinforcement method and underpinning method (the method used only for the foundation reinforcement of old b...

AI Technical Summary

Problems solved by technology

[0007] Since the power of the existing static pile machine is only 30T and 40T, the static pressure generated by the reaction device provided by it is limited to a certain extent, such as the length of the pile is not more than 12m and the bearing capacity of the composite foundation provided The eigenvalues ​​are also limited

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