Method for correcting inclined hole formed by high strength stratum bridge drilling pile in karst growing area

Abstract

The invention discloses a method for correcting an inclined hole formed by a high strength bridge drilling pile in a karst growing area. The invention is characterized in that the method comprises the following steps: (1) verifying the position in which a plagioclase is located, and determining the accurate position and direction of the plagioclase; (2) drilling small holes on the top surface of the plagioclase beside the inclined hole by adopting a minitype geological drilling machine; (3) feeding water-proof explosive into the underground small hole; (4) carrying out underground controlled blasting to crush or loosen the stratum; and (5) carrying out percussion on the crushed or loosened stratum by a percussion drill, thus the aims of correcting the deflection of a drill hole and rapidly forming a hole are achieved. The small hole drilled by adopting the minitype geological drilling machine is 200-300mm away from the top surface of the plagioclase beside the inclined hole, the diameter of the small hole is 85-95mm, and the drilling depth is 2-8-3.5m in the plagioclase. The construction method applied in the invention can be popularized in the railway, road and municipal bridge projects, a continuous beam for crossing is not required by a complex drilling pile in the karst growing area, thus saving the investment; and the construction progress can be sped up, and the application prospect is wide.

Description

technical field [0001] The invention relates to a method for rectifying the deviation of inclined holes of bridge bored piles in high-strength rock formations in karst-developed areas. Background technique [0002] According to the requirements of the national standard, the inclination of the drilled holes of the bridge bored piles must be less than or equal to 1% of the hole depth, so as to ensure the bearing capacity requirements of the bored piles. In existing karst-developed areas, bridge bored piles are often drilled with partial hole phenomenon. The existing technical solution for correcting the deviation is: throwing and filling high-strength flakes, and then using a percussion drill to correct the deviation; after measurement, the inclination of the drilled hole cannot If the requirements are met, high-strength flakes are thrown and filled, and the impact drill is used to repeatedly impact and correct the deviation. The shortcoming of prior art scheme: (1) to the pa...

AI Technical Summary

Problems solved by technology

In existing karst-developed areas, bridge bored piles are often drilled in a hole-deviation phenomenon. The existing deviation-rectification technical scheme is: throwing and filling high-strength flakes, and then using a percussion drill to correct the deviation; after measurement, the inclination of the drilled hole cannot If the requirements are met, high-strength flakes are thrown and filled, and the impact drill is repeatedly impacted to correct the deviation

The shortcoming of prior art scheme: (1) to the partial hole that rock stratum strength is not big in borehole, throw and fill rubble, can rectify deviation with percussion drill repeated impact, but progress is slow, needs to use a large amount of high-strength rubble, and cost is high; ( 2) For the partial hole with high rock formation strength in the drilled hole, throwing and filling the chip, and repeatedly impacting the impact drill with the percussion drill, the correction effect is not obvious, the progress cannot be guaranteed, the quality cannot be guaranteed, and it is easy to cause labor disputes

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