Karst area pile foundation construction method

Abstract

The invention provides a karst area pile foundation construction method. Construction is easy and convenient, the construction cost is effectively reduced, and engineering quality is greatly improved.The method comprises the following steps that a vibration hammer is adopted at the designated position to beat an outer protection barrel, the perpendicularity is controlled through a guide facility,and the vibration hammer penetrates through a soft plastic layer and enters a hard plastic layer; a rotary drill is used for enlarging a hole to be 1.0 m away from the uppermost layer karst cave topbase rock; a drilling machine is adopted in the outer protection sleeve to repeatedly impact for slurry making and drilling start, the hole is cleaned in real time after being finished, a hole way isformed, and the inner wall of the hole way is tamped; an inner protection barrel is placed down, multiple grouting pipes are evenly distributed on the periphery of the inner protection barrel, a horizontal ruler is adopted for strictly controlling the perpendicularity of all sections of protection barrel, and positioning steel bars and a hole forming detector are adopted for avoiding protection barrel inclination; the gap between the inner protection sleeve and the enlarged hole is filled with broken stone, and four PVC pipes reserved on the outer side of the inner protection barrel are used for grouting and solidification; and an impact drill drills to the pile bottom elevation through repeated throwing filling extrusion, and grouting pile forming is achieved.

Description

technical field [0001] The invention relates to a pile foundation construction method, in particular to a pile foundation construction method in a karst area. Background technique [0002] For pile foundation construction in karst areas, there are a large number of karst caves, wide distribution, a wide range of pile lengths, various pile foundations, and various pile diameters. According to the analysis and research on the exploration data, the difficulties in engineering construction include the following aspects: [0003] 1. Fissure leakage. During pile foundation construction in karst areas, due to the existence of karst caves, it is easy to leak slurry during the hole forming process, which will bring a series of quality and safety risks to the hole forming construction. Therefore, how to control the slurry leakage problem during the hole forming process and reduce the impact on cost The effect of holes is a difficult point in the construction of pile foundations in k...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of existing pile foundation construction in karst areas, such as slurry leakage, hole collapse, diameter shrinkage, etc., the present invention provides a pile foundation construction method in karst areas, which is easy to construct, and at the same time, the construction is convenient, effectively reducing the construction cost and greatly improving the quality of the project

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