Loose accumulation body stratum concrete protection wall rotary excavating quick pore forming method

Abstract

The invention discloses a loose accumulation body stratum concrete protection wall rotary excavating quick hole forming method. The method mainly comprises the following construction steps of conducting measurement lofting, burying a steel retaining cylinder at a hole opening, conducting construction through a rotary drill rig to drill into a loose soil layer by the pile hole depth of about 2 m and lifting up the rotary drill rig; filling micro-aggregate concrete into a pile hole and descending a drill of the rotary drill rig to repeatedly impact and squeeze concrete downwards to press the micro-aggregate concrete or grout into a surrounding loose accumulation body under the action of a certain impact pressure; conducting initial setting for 1-2 days, conducting construction through the rotary drill rig again after the micro-aggregate concrete or the grout reaches a certain strength, conducting rotary drilling on the solidified concrete in the drilled hole previously, and squeezing thesolidified concrete into the surrounding loose accumulation body and adhering the solidified concrete to the hole wall to form a circle of concrete solidified body protective wall. Through the looseaccumulation body stratum concrete protection wall rotary excavating quick hole forming method, the rotary drilling rig can conduct effective drilling in a loose rock-soil accumulation body stratum, the construction progress is accelerated, the phenomena of hole collapse, drill jamming and the like are avoided, and the hole forming quality is improved.

Description

technical field [0001] The invention relates to a method for quickly forming holes by rotary digging, in particular to a rapid hole-forming technology by rotary digging for retaining walls of loose accumulation strata. Background technique [0002] Rotary excavation pile generally refers to the pile foundation formed by drilling a hole with a rotary drilling rig and pouring concrete into it. Due to the use of mechanical operations, the number of workers is small, the construction is safe and convenient, the stratum is widely applicable, the construction efficiency is high, and the degree of mechanization is high, so it has been rapidly promoted. [0003] The efficiency of the rotary drilling rig is very high in the general clay layer, silt layer, and strong weathered rock layer, and the construction difficulty is relatively low. When there are no wall protection measures or the wall protection measures are weak, repeated hole collapses are likely to occur, and the quality o...

AI Technical Summary

Problems solved by technology

[0003] The efficiency of the rotary drilling rig is very high in the general clay layer, silt layer, and strong weathered rock layer, and the construction difficulty is relatively low. When there are no wall protection measures or the wall protection measures are weak, repeated hole collapses are likely to occur, and the quality of the piles is difficult to guarantee, which will also cause delays in the construction period and increase in costs

For the rotary drilling of loose accumulation strata, the all-steel casing is generally used as the wall to drill the hole. However, during the pouring process of the pile foundation, the steel casing cannot be pulled out, and it will be completely buried in the pile body. The construction cost of the hole is high, and the construction operation of pressing the steel casing is not fast and convenient

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