A Hole Forming Method Using Steel Casing Cooperating with Rotary Drilling in Complicated Strata

Abstract

The invention discloses a method for forming a hole in a complex stratum with rotary drilling and steel casing matching. The method comprises the following steps: 1. leveling the construction site and measuring and placing pile positions; Drilling of drilling rigs and subsequent release of steel casings; 4. Drilling of rotary drilling rigs in the lower karst formations and subsequent release of steel casings. The steps of the method of the present invention are simple and reasonable in design. By setting the casing lowering power part on the rotary drilling rig, the construction of the rotary drilling drill can be realized, and the follow-up and lowering of the steel casing can be realized through the casing lowering power part, effectively adapting to the Bored piles in complex strata form holes to prevent hole collapse. The required construction equipment is small, the equipment utilization rate is high, the hole forming speed is fast, the construction efficiency is high, and the cost is low.

Description

A Hole-forming Method for Rotating Drilling into Steel Casing in Complex Strata technical field The invention belongs to the technical field of bored pile forming, particularly relate to a kind of complex stratum rotary drilling and drilling steel casing to cooperate pore forming method. Background technique At present, the upper part of the complex stratum is a water-rich stratum, and the bottom is a karst stratum, and the karst stratum bored pile construction is carried out with impact drilling The karst cave is mainly treated with backfilling rubble, clay and concrete or grouting and other main treatment measures. The piling cycle of the root pile is as short as more than one month, and as long as more than half a year. The construction cycle is uncontrollable, and the percussion drilling hole often becomes stuck. The phenomenon of drilling, dropping, and collapsing holes makes it difficult to form bored piles, high safety risks, large construction investment, and...

AI Technical Summary

Problems solved by technology

[0002] At present, the upper part of complex strata is water-rich stratum, and the lower part is karst stratum. The construction of bored piles in karst stratum is mainly by percussion drilling. The main treatment measures for karst caves are backfilling flakes, clay and concrete or grouting. Using this method for construction, a single The pile-forming period of the root pile is as short as more than one month, and as long as more than half a year. The construction period is uncontrollable, and the percussion drilling often occurs drill sticking, drill drop, and hole collapse, which makes it difficult and safe to form bored piles. High risk, large construction investment, difficult pile quality control, many unforeseen risks, etc.

In addition, if the casing is used to follow up, the collapse of the hole can be prevented. However, at present, the casing is lowered by crawler cranes, and the casing machine is lowered. Not only is there a lot of construction equipment but also a lot of procedures, which is neither economical nor efficient.

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