A construction method of combined piles composed of bulk material piles and concrete piles up and down

Abstract

The invention discloses an up-and-down integrated composite pile of a discrete material pile and a concrete pipe and a construction method of the composite pile. Concrete is poured into the lower part of a pile body to form the concrete pile, while gravel is poured into the upper part of the pile body to form a gravel pile; the diameter of the gravel pile is greater than that of the concrete pile; a concrete enlarged connecting end having the same diameter as the gravel pile is arranged at the top of the concrete pile, so that an integrated composite pile which is thick in top and thin in bottom is formed; a geotechnical cloth bag is arranged outside the gravel pile; the bottom of the geotechnical cloth bag is closed and connected to a cross steel plate, wherein a connecting reinforcement bar is arranged at the bottom of the cross steel plate; a gravel and concrete mixed section is arranged on the cross steel plate and connected with the gravel pile; the connecting reinforcement bar is inserted in the concrete enlarged connecting end. The up-and-down integrated composite pile of the discrete material pile and the concrete pipe has the beneficial effects that sufficient drainage consolidation of weak soil is realized in the construction period, meanwhile, a soil layer having relatively better bearing capacity is embedded in the bottom of the concrete filled pile, better bearing effect can be developed, the pile has excellent bearing capacity in the operational periods of an embankment and a structure, and simultaneously, the pile has smaller post-construction settlement and better technical economic benefits.

Description

technical field [0001] The invention relates to a composite pile and a construction method, more specifically, it relates to a construction method of a composite pile composed of bulk material piles and concrete up and down, and belongs to the field of foundation engineering. 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 engineering problems such as excessive total settlement, obvious differential settlement, excessive later settlement, and insufficient bearing capacity, which affect the normal use and safety performance of the building. When the natural foundation cannot meet the requirements of the building for the foundation, the foundation needs to be treated to form an artificial foundation to ensure the safety and usabi...

AI Technical Summary

Problems solved by technology

However, gravel piles also have their disadvantages: First, the traditional gravel piles are made of flexible bulk materials with low strength, and the effective reinforcement depth is usually less than 20m. The depth is difficult to reach in the relative bearing layer with better soil quality, and it is difficult to ensure that it can have sufficient bearing performance

This invention has the following deficiencies: (1) water is discharged from bottom to top during consolidation drainage, and the gravel piles are placed in the lower layer, which cannot fully play the role of drainage of the gravel piles; The effect of the rigid pile cannot be fully utilized in a deep place, and it is easy to cause quality problems of the gravel pile; (3) the invention utilizes the penetration of the concrete slurry at the bottom of the cast-in-place pile to form a connection between the concrete pile and the densely squeezed gravel pile, and the connection effect is difficult to guarantee

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