Construction method of concrete pile

Abstract

The invention provides a construction method of a concrete pile. According to the construction method, at first, diameter expanding and varying concrete pile body construction is performed, and then, a pile end is installed, and pile-side post-casting is performed, and therefore, the bearing capacity of the pile can be greatly increased. The construction method includes the following steps that: 1) pile body pore-forming is performed at a pile position, diameter expanding is performed on a pile body or a pile bottom in squeezing expanding, rotating expanding and drilling expanding manners in pore-forming or after pore-forming; 2) a steel reinforcement cage with slurry-jacking pipes is immersed into a pile hole, slurry outlets are located at corresponding positions of the pile bottom and a diameter expanded portion respectively; 3) pile body concrete is poured into the pile hole; and 4) after the pile body concrete has a certain strength, cement slurry is injected into the slurry-jacking pipes through pressure, so that the cement slurry can diffuse and permeate to the lower part of the pile end and soil at the periphery of the pile body under the action of pressure, and will be solidified at the lower part of the pile end and the soil at the periphery of the pile body, and therefore, the strength of the soil at the periphery of the pile can be improved when the diameter of the pile is further increased.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to pile foundation construction technology. Background technique [0002] In pile foundation engineering, people have used and invented many methods to increase the bearing capacity of piles. Variable-diameter cast-in-place concrete piles are a large class of construction techniques that are often used. The principle is to add larger-diameter The enlarged diameter part of the pile can improve the bearing capacity of the pile by increasing the area of ​​the pile side or the pile end. At present, the main construction methods used include extruded and expanded branch piles, extruded and expanded branch piles, DX extruded and expanded cast-in-place piles, drilled and bottom-enlarged cast-in-place piles, Multi-section expanded cast-in-situ piles, etc. These construction methods have their own characteristics and advantages, but they also have certain shortcomings and deficiencies. The ...

AI Technical Summary

Problems solved by technology

Since this construction method is always based on the size and specifications of the original concrete pile, there is a limit to the improvement of its bearing capacity, and it cannot cause a huge and essential change in the bearing capacity of the original concrete pile.

Images