Pile foundation hole collapse treatment method

Abstract

The invention discloses a pile foundation hole collapse treatment method. The pile foundation hole collapse treatment method comprises the steps that a rotary drilling rig is adopted to dig to a holecollapse part, silt generated by hole collapse is removed, concrete is adopted for recharging, recharging is carried out to the hole collapse top, after the concrete is solidified, a middle part of the solidified concrete is taken out, and the rest parts form a concrete retaining wall to prevent intensifying of hole collapse. According to the treatment method, the concrete is adopted for recharging to form a hole, the hole collapse problem can be effectively solved according to a project situation, and the construction period requirement is met.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a pile foundation collapse hole treatment method. Background technique [0002] Hole collapse is the most common accident, which may occur during drilling or after hole formation. The reasons are as follows. (1) The mud consistency is small, the wall protection effect is poor, and water leakage occurs; or the casing is embedded shallowly, and the surrounding sealing is not dense, resulting in water leakage; or the soil layer at the bottom of the casing is not thick enough, and water leakage occurs at the bottom of the casing, resulting in the height of the mud head Insufficient, the pressure on the hole wall is small. (2) The relative density of the mud is too small, and the pressure of the water head on the hole wall is small. (3) The footage is too fast in the soft sand layer, the mud retaining wall is formed slowly, and the hole wall seeps water. (4) D...

AI Technical Summary

Problems solved by technology

(7) Water loss in the hole causes insufficient water head height

[0005] Disadvantages of full casing follow-up hole forming: due to the long length of some piles, the casing cannot be effectively removed, and the cost increases

The casing follow-up process is cumbersome and the construction period is slow, so it is not suitable for project use