Construction device and construction method of cement slurry retaining wall implanted pipe pile with long helical drilling

Abstract

The invention discloses a long auger drilling cement mortar retaining wall type implanted pile tube construction device and construction method; the construction device comprises a pile frame, a power head, a drilling rod, a normal pressure grouting pump, a normal pressure grouting pipe, a high pressure grouting pump, a high pressure grouting pipe, a steel sleeve (6), a slurry suction pump (7) and a liquid storage pool (8); a lower portion of the steel sleeve (6) is buried into soil, and an upper portion is higher than the ground; the slurry suction pump (7) is arranged in the steel sleeve (6); an exit of the slurry suction pump is connected with the liquid storage pool (8). Key steps of the method comprises the following steps: first carrying out jet grouting drilling in an expanded-base segment; then carrying out non-jet grouting idle pulling up; then drilling and pulling, and keeping jet grouting in the drilling and pulling process; conveying overflowing normal segment cement mortar in a pile sinking process to the liquid storage pool (8) for storage. The device and method enable a pile to have strong bearing capacity, pile-forming quality is good, so no damage is caused to surrounding soil environment, and the environment is not polluted.

Description

Technical field [0001] The invention relates to a pile foundation construction technology in the field of civil engineering, in particular to a construction device and a construction method for a long spiral bored cement slurry wall-protected implanted pipe pile. Background technique [0002] With the development of national economic construction and the continuous development and application of pile foundation construction technology, the application of pile foundation for soft soil foundation is becoming more and more extensive. The types of pile foundations in the prior art mainly include mud-protected wall bored piles, ordinary long spiral bored pressure-grouted piles, prestressed concrete pipe piles (pipe piles for short), and ordinary static drill rooted prestressed pipe piles. [0003] The above-mentioned pile foundation types have their own problems. The mud-protected bored pile will form a large amount of wall-protecting mud, which pollutes the environment and is difficul...

AI Technical Summary

Problems solved by technology

Bored piles with mud retaining wall will form a large amount of retaining mud, which will pollute the environment and be difficult to handle. Moreover, the uplift bearing capacity of the pile foundation is not ideal, and its depth is easily limited by the soil layer, such as in very hard gravel layers and weathered bedrock layers low drilling efficiency

Ordinary long auger-drilled grouting piles are drilled in place and the concrete is pumped under normal pressure. After inserting the reinforcement cage, insert the reinforcement cage with a reinforcement device. The thickness deviation of the concrete cover layer of the cage is large, which affects the overall quality of the pile foundation

When the prestressed concrete pipe pile is sunk, it will produce a strong soil squeezing effect, which will easily affect and damage the surrounding soil environment. The soil extrusion force on the pipe pile itself is also large. Squeezed, tilted or even broken

Ordinary static drilling and rooting prestressed pipe piles are injected with cement slurry and mixed with the soil in the hole to form a cement-soil retaining wall, and then the side friction of the implanted pipe pile is transmitted to the soil layer around the pile hole by the cement-soil, and the overflow The cement-soil slurry is wasted and pollutes the site, and the strength of the cement-soil is not ideal after hardening, resulting in the unsatisfactory strength of the entire pile body

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