Filling pile construction pore-creating method of pervious ultra-deep loose backfill two-piece stone zone

Abstract

The invention discloses a drilling method for the construction of a cast-in-place pile of a dank ultra-deep loose refilling rubble area, which comprises the following steps: step 1: a slope area of 4m to 6m is arranged in an area right ahead an arranged pile casing to serve as a slurry return flow line, and a slurry pool is dug outside the slope area; step 2: residue is drawn out once every 1 hour to 3 hours during a punching process; step 3: all the drawn-out slurry flows backwards into a drilling hole by utilizing the slope area; step 4: when punching work is carried out, the proportion of the slurry in the hole is increased, thereby being capable of increasing wall retaining capability and reducing hole collapse risk; and step 5: after drilling is carried out to a stable stratum of certain depth, the proportion of the slurry in the hole is gradually reduced; slurry containing the residue is discharged; and the slurry is discharged once every 2 hours to 3 hours. By adopting the method that the slurry flows backwards naturally, the method of the invention changes the traditional mode of slurry circulation, maintains the balance of the slurry, simplifies the construction process and lowers the construction risk.

Description

technical field [0001] The invention relates to a hole-forming method for permeable super-deep loosely backfilling a two-piece stone area with cast-in-place piles. Background technique [0002] There are roughly several types of hole-forming technologies for conventional cast-in-place piles: [0003] 1. Non-squeeze method of hole forming: such as dry operation drilling (digging) drilling, mud retaining drilling (digging) drilling, full casing follow-up retaining drilling (digging) drilling; among them, [0004] Drilling (digging) into holes by dry operation method and drilling (digging) into holes with mud retaining wall are suitable for construction in sites with good engineering geological conditions, and it is basically not easy to produce collapsed holes; [0005] The construction cost of drilling (digging) into the hole by the method of following up the retaining wall with the full casing pipe is high, generally 1 / 3 higher than other methods. [0006] 2. Partial extru...

AI Technical Summary

Problems solved by technology

This method is prone to the following problems: 1. While the mud is sucked from the bottom of the hole, due to the untimely replenishment of the mud at the hole, the liquid level of the mud in the hole changes greatly, causing the pressure on the wall of the hole wall to decrease rapidly, resulting in soil Due to the change of body stress, the stratum with unstable hole wall (such as quicksand, uncompacted sand, soil layer, etc.) is prone to collapse holes, and even cause accidents of buried drills and drilling rigs.

2. Due to the large difference in performance (such as viscosity, specific gravity, etc.) between the pumped mud and the supplemented mud, for the stratum with unstable hole walls, this change will also bring unfavorable results to the construction

Images