Wall protection construction method for rotary excavating pile

Abstract

The invention relates to a wall protection construction method for a rotary excavating pile, and belongs to the technical field of rotary excavating pile construction. The wall protection constructionmethod comprises the following steps that a slurry pool is constructed, and the slurry pool is filled with wall protection slurry; a rotary drilling machine is used for drilling, in the drilling process, the wall protection slurry in the slurry pool is guided into a pile hole, and the balance of the drilling liquid level is kept; after drilling is completed, sediment is removed, and the wall protection slurry is recycled; and the wall protection slurry filled in the slurry pool is a polyacrylamide aqueous solution, and the concentration of the polyacrylamide aqueous solution meets the following requirements that in the drilling process, the viscosity of the wall protection slurry in the pile hole is controlled to be 28 Pa.s to 35 Pa.s. According to the wall protection construction method,the polyacrylamide aqueous solution is adopted to replace a traditional mud protection wall, polyacrylamide has flocculability, thixotropy, resistance reduction and thickening property, and has goodcollapse prevention, seepage prevention and leakage stoppage effects so that rotary drilling construction can be completed with high quality, quickness and low cost.

Description

technical field [0001] The invention relates to a wall protection construction method for rotary excavation piles, and belongs to the technical field of rotary excavation pile construction. Background technique [0002] Pile foundation is one of the important foundation forms commonly used in construction engineering at present. The commonly used construction methods for mechanical hole-forming piles in civil buildings are impact hole-forming and mechanical rotary drilling; the advantages of using impact-hole-forming piles are: The foundation has good stability after the hole is formed, and it is not easy to cause the pile hole to collapse. The disadvantage is that the construction period is long and the verticality deviation of the pile hole is large. [0003] In recent years, in many projects with tight construction schedules or urban constructions with high environmental protection requirements, a new type of drilling rig——rotary drilling rigs are gradually replacing trad...

AI Technical Summary

Problems solved by technology

The most common quality problem in the construction of underwater rotary drilling bored piles is hole collapse, and the collapse of holes has the greatest impact on the quality of pile foundation holes. After hole collapse occurs, the pile holes are not easy to form and need to be reworked, which affects the construction progress; and After forming, the diameter of the pile becomes larger and the amount of concrete is excessive, resulting in an increase in construction cost and a delay in the construction period

On the other hand, during the construction process, traditional bentonite mud retaining wall is often used to prevent pile holes from collapsing. However, using mud retaining wall requires excavating a mud pool for mud mixing, which will cause great damage to the site and is not conducive to site layout and civilization. construction requirements

In addition, for the treatment of weak ground, the method of full-casing wall protection is often used to prevent pile holes from collapsing, but the construction cost of using full-casing protection is high, and professional equipment is required for construction, which is not conducive to on-site construction

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