Construction method of gravel grouting pile

Abstract

The invention discloses a construction method of a gravel grouting pile. The construction method comprises the following steps: (1) preparing for construction, (2) conducting measurement, paying off and positioning of the pile, (3) embedding a protective canister, (4) placing a drilling machine in place, (5) forming a hole by drilling, (6) cleaning the hole at a time, (7) placing a grouting pipe, (8) placing an anchor bar, (9) putting gravels in the hole, (10) installing a pile cap connecting steel pipe, (11) cleaning the hole, (12) conducting pressure grouting, (13) pulling the grouting pipe out, (14) constructing a pile cap, and (15) conducting detection and acceptance inspection on the finished pile. According to the construction method of the gravel grouting pile, the construction speed is high, the construction period is shortened, and compared with soft foundation treatment such as a prestressed pipe pile and a Y-type pile, the engineering investment is saved; the labor intensity is low, the construction is safe, and the construction method can be widely popularized and used; the gravel pile formed by cement and gravels is high in integrality and stability. The engineering drilling machine is adopted in a soft foundation to drill the hole in a rotating and cycling mode to form the pile, the disturbance to the foundation and the surrounding buildings is small, ground depression is controlled, and the construction method is small in vibration and low in noise during the construction and has good social benefits.

Description

technical field [0001] The invention relates to a construction method of gravel grouting piles. Background technique [0002] With the development of railways and highways, higher requirements are put forward for the load capacity and settlement control of bridge cast-in-place piles. However, there are many defects in the construction quality of bored piles: [0003] (1) Disturbance damage such as unloading, loosening and local collapse will inevitably be caused to the soil around the pile when the hole is formed, and the longer the pile, the larger the diameter of the pile, and the longer the drilling time, the more serious the damage will be; [0004] (2) The use of mud forms a "mud layer" with low bearing capacity between the pile and the soil around the pile, and the residual sediment and mud deposits at the bottom of the hole form a "weak layer" at the bottom of the pile; [0005] (3) Disturbance damage such as unloading, loosening, and local collapse greatly reduces ...

AI Technical Summary

Problems solved by technology

[0005] (3) Disturbance damage such as unloading, loosening, and local collapse greatly reduces the strength and stiffness of the soil around the pile, and the "mud skin layer" and "weak layer" aggravate this consequence;

[0006] (4) The poured concrete will generally produce solidification shrinkage during the curing period, which will lead to uncontrollable small gaps between the pile and soil

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