Combined foundation pile composed of steel pipe pile and cement soil pile

Abstract

The invention relates to the technical field of foundation piles, and particularly relates to a combined foundation pile composed of a steel pipe pile and a cement soil pile. The combined foundation pile comprises a pile body, a rabbet dowel and a pile cap. Due to the fact that the parameter of the rigidity of soil between piles needs to be considered during pile foundation construction, the numerical difference between the rigidity of the soil between the piles and the rigidity of the pile body is reduced as much as possible, and the soil arching effect is weakened; and when the steel pipe pile is used for soil squeezing construction, perpendicularity deviation caused by the circumferential soil quality change of the steel pipe pile is likely to happen, and the subsequent construction precision of the cement soil pile is influenced. Therefore, wedge-shaped hammer pits in central symmetry are formed in the pile cap, the pile cap acts on the wedge-shaped hammer pits in different positions of the pile cap in the piling process, the pile body is in a rotation feeding state, the wedge-shaped hammer pits in the circumferential position of the pile body are utilized for adjusting the perpendicularity of the pile body in the piling process, then the construction precision of the steel pipe pile is controlled, and therefore the construction effect of the combined foundation pile composed of the steel pipe pile and the cement soil pile is improved.

Description

technical field [0001] The invention relates to the technical field of foundation piles, in particular to a composite foundation pile composed of steel pipe piles and cement-soil piles. Background technique [0002] With the continuous development of civil engineering construction, the construction of structures on weak foundations or specific places has appeared in large numbers in engineering projects due to the importance of foundation pit support, and the construction of steel pipe piles under specific conditions has been more and more popular. In pile foundation engineering, there is a large difference between the stiffness of the pile body and the stiffness of the soil between the piles, which is the direct cause of the soil arching effect, and the strength of the soil arching effect depends on the difference in stiffness. In the case of complex foundation settlement, the stiffness of the cushion foundation has become the main factor for the differential settlement bet...

AI Technical Summary

Problems solved by technology

[0003] During the construction of pile foundation, it is necessary to consider the parameters of the stiffness of the soil between the piles, and minimize the numerical difference between it and the stiffness of the pile to weaken the soil arch effect. The combination of flexible length and short piles is used to reduce the soil arch effect between the pile foundations. However, when the steel pipe piles are used for soil compaction construction, they are easily affected by the verticality deviation caused by the soil quality changes in the circumferential direction of the steel pipe piles, which will affect the subsequent cement-soil piles. construction accuracy

[0004] For example, a Chinese patent with the application number CN201710902856.1 discloses a steel pipe concrete pile, including an outer steel pipe, a loading plate and a drill bit, the top outer wall of the outer steel pipe is provided with external threads, and the bottom inner wall is provided with internal threads; The outer wall of the outer steel pipe and the position between the outer thread and the inner thread are welded with a spirally surrounding thread blade; the top outer wall of the outer steel pipe and the position below the outer thread is fixedly welded with a fixing ring; The top of the outer steel pipe is threadedly connected to the loading plate through an external thread, and at the same time, the loading plate is detachably fixedly connected to the fixing ring; the inner steel pipe is fixed at the inner center of the outer steel pipe; this technical solution can easily The composite pile is driven into the ground by rotation; however, this technical solution does not take into account the construction process of steel pipe piles under different soil conditions, and does not effectively guide the extruded coating, which affects the construction of steel pipe piles and subsequent concrete piles precision problem

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