Construction method for carrier pile of major diameter long pile

Abstract

An objective of the invention is to provide a construction method for a carrier pile of a major diameter long pile. A method of alternate double casing is used, and aimed at different soil layers, a plurality of means are selected, so as to complete large diameter and large depth pile body pore forming. Then carrier construction is performed on a pile tip, obviously improving carrying capacity of a pile and improving work efficiency and saving cost. The method comprises steps: 1) using a double casing pipe method to perform pore forming construction, soil-squeezing pore forming steps: making an A pile casing with a pile tip sink, making a B pile casing sink in the A pile casing and making the B pile casing sink to a set depth, soil-taking pore forming steps: making the open A pile casing sink and then taking soil mass in the A pile casing out, making the B pile casing sink in the A pile casing, and making the B pile casing sink to the set depth again, and taking soil mass in the B pile casing out; 2) according to soil layer property and upper load requirement, performing reinforcement treatment of the pile end through one of a plurality of methods, so that soil mass at a certain depth under the pile end and in a certain range are reinforced and compacted to form a pile end carrier, to realize equivalent calculation area Ae of the carrier pile; 3) and performing cast-in-place or precast concrete pile body construction through one of a plurality of methods.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to the construction of piles. Background technique [0002] With the development of my country's economic construction, there are more and more construction projects such as bridges, elevated railways, high-rise buildings, etc., and the requirements for the bearing capacity of foundation piles are also getting higher and higher. At present, piles with a bearing capacity of more than 2000kN are generally used. The method of increasing the pile diameter and increasing the pile length is to increase the friction force and end resistance of the pile to achieve the purpose of improving the bearing capacity of the pile. However, the project cost of such large pile diameter and long pile is very high. The reason is that the consumption of building materials is very large, and the second is that the requirements for construction equipment are high. It is difficult to form holes, especially ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of construction equipment and construction methods, it is difficult to complete piles with larger diameter and longer piles, so it is difficult to apply in projects with high bearing capacity requirements.

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