Construction method for drilling of rotary drilling rig in complicated geological formation

Abstract

The invention discloses a construction method for drilling of a rotary drilling rig in a complicated geological formation. The method includes steps: wedge-shaped angle steel is welded on inner wallsof a cylindrical drill and a roller bit by employing an improved cone cylindrical drill or a pick cylindrical drill to enable the periphery of rocks to perform crushing cutting, after the top is clamped with a rock core, the rock core is twisted off back and forth through forward and reverse rotation to directly bring out a rock sample, the problems of difficult hole forming in the hard rock formation and hole shift and hole deviation caused by uneven pile heads of two sides of an engagement pile are solved, the influence of drilling on pile forming is effectively reduced, the construction efficiency and the construction quality are improved, and the construction cost is reduced. According to the construction method, compared with a percussion drilling construction method, the footage speed is fast, the footage of a percussion drilling at each time is usually 0.5-0.8 m, the rotary drilling rig can achieve the footage of 5-10 meters in cooperation with a drilling tool at each time, thedrilling machine can be sensed in time during change of the hardness of the formation, the rotating speed of the drilling machine and the pressure are adjusted to control the verticality of holes, andthe hole-forming quality is guaranteed.

Description

technical field [0001] The invention belongs to the construction field, and in particular relates to a construction method for drilling a rotary drilling rig in complex geological formations. Background technique [0002] The existing rock-entry construction is that the percussion drill impacts and the drilling tool first breaks the surrounding rocks, then uses the auger bit to break in the middle, and finally adopts a sand bucket or a double-door pick bit to take out the broken rock. Impact drilling is an earlier traditional technology, which is more applicable to strata and construction sites, but the construction speed is too slow, and it is not suitable for municipal projects with tight construction schedules; it is first broken around the middle and then broken in the middle, and finally the slag method is more commonly used, but Construction progress cannot be guaranteed. details as follows: [0003] 1) Use the percussion drill to punch the hole, the speed is slow, b...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of percussion drill punching speed, low efficiency, large consumption of drilling tools and unguaranteed punching quality existing in the existing technology of rock drilling construction that first breaks around the periphery

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