Integrally-arranged and externally-wrapped double-layered water discharging body and middle concrete combined pile and construction method

Abstract

The invention relates to an integrally-arranged and externally-wrapped double-layered water discharging body and middle concrete combined pile which is formed by a pile body inner side annular water discharging body, a cast-in-place concrete thin-walled pipe pile body, a pile body outer side annular water discharging body, a prefabricated pile tip and a prefabricated reinforced concrete cover plate; the prefabricated pile tip is arranged at the bottom of the combined pile; the top face of the pile tip is provided with four annular grooves for limiting the position of an immersed tube; the prefabricated reinforced concrete cover plate is arranged at the top of the combined pile; and a water discharging branch pipe is arranged inside the cover plate. According to the integrally-arranged and externally-wrapped double-layered water discharging body and middle concrete combined pile disclosed by the invention, the water discharging bodies with the uniform thickness are arranged on the inner side and the outer side of a concrete tubular pile, so that the consolidation of the soil body between the piles can be accelerated, the bearing capability of a soil foundation is improved, diseases of pile breaking and the like, caused by a soil squeezing effect, can be prevented when an adjacent pile is pegged, and the good technical economic benefit can be realized. The invention further provides a construction method of the combined pile.

Description

technical field [0001] The invention relates to a combined pile with built-in and outsourced double-layer drainage body and intermediate concrete and a construction method, which can accelerate the drainage and consolidation of soft soil, weaken the soil squeezing effect between piles when adjacent piles are laid, and prevent pile breakage in cast-in-situ concrete piles. It belongs to the field of foundation engineering and is suitable for foundation treatment of highways, municipalities, airports and dams in soft soil areas. Background technique [0002] There are many types of soft soil foundations in my country, which are widely distributed, and generally have the characteristics of high water content, high compressibility, low strength, and poor water permeability. Buildings built on soft soil foundations often have problems such as excessive total settlement, obvious differential settlement, excessive later settlement, and insufficient bearing capacity, which affect the...

AI Technical Summary

Problems solved by technology

[0005] Although the drainage consolidation method and the cast-in-place concrete thin-walled pipe piles have strong application value, in actual engineering, these treatment methods have shown some shortcomings: the construction time of the drainage consolidation method is long, and after the reinforcement is completed The improvement of the overall strength of the foundation is limited, and the amount of deformation in the later period is relatively large; the soil squeezing effect during the foundation pile of cast-in-place concrete thin-walled pipe piles is very obvious, which easily leads to the destruction of the adjacent pile structure. At the same time, the construction of the pile body will destroy The structural properties of the soil between the piles affect the bearing function of the soil, etc.

When considering the impact of cost factors, the idea of ​​soft foundation treatment is usually adopted as the main method of drainage preloading and supplemented by the method of composite foundation, but both methods have shortcomings and limitations

The existing method of combined application of drainage consolidation and composite foundation can take into account the advantages of drainage consolidation method and composite foundation method to a certain extent, but in solving technical problems such as vertical continuity of drainage body and effective control of post-construction settlement, etc. not perfect

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