Drilling method of rotary drilling machine in hard rock and special-purpose sediment pipe core cone bit

Abstract

The invention discloses a drilling method of rotary drilling machine in hard rock and a special-purpose sediment pipe core cone bit. The drilling method comprises the steps of: (1) installing an gas-water joint; (2) installing a sediment pipe gear wheel core drill bit; (3) connecting an inflator, the gas-water joint and the sediment gear wheel core drill together by air supply flexible pipes; (4) putting the drill bit in an aperture, starting the inflator to supply air into the aperture and simultaneously operating the rotary drilling machine for drilling; (5) after the drilling, powering off the inflator, taking out the sediment pipe gear wheel core drill bit, opening the sediment pipe valve to remove the sediment in the pipe and then closing the valve; (6) repeating the above steps until pore-forming is completed. Comparing with routine methods, the method applies a drill bit with a simple and durable structure, small wearing of the drilling tool, high efficiency of drilling and good heat radiation, which effectively solves the drilling problem of rotary drilling machine in hard rock.

Description

technical field [0001] The invention relates to a pile foundation construction technology, in particular to a drilling method of a rotary drilling rig in hard rock and a special sediment tube roller core bit, belonging to the technical field of civil engineering. Background technique [0002] At present, there is no lack of rock-socketed pile design in many engineering projects. Usually, the rotary drilling rig is used to complete the overburden drilling, and then the percussion drilling rig is used to complete the drilling of the rock-socketed part at the lower end of the hole, which makes the rotary drilling rig fully play a convenient role in the project. Efficient features are limited. At the same time, it caused many difficulties for construction and project management. If a rotary drilling rig is used to complete the rock formation drilling of the rock-socketed part, a tubular rock drill bit and a short helical rock drill bit are usually used to drill into the rock fo...

AI Technical Summary

Problems solved by technology

The drilling efficiency of this method is low, the residual drilling slag at the bottom of the hole is not easy to remove, and the high temperature generated by the drilling tool during work cannot be eliminated, resulting in an extremely reduced strength of the drilling tool material and severe wear

In addition, since the drill pipe used in the rotary drilling rig is not used as a circulating gas-liquid flushing channel, during drilling, due to the accumulation of drilling slag at the bottom of the hole, it will generate a large rotational frictional resistance to the drill bit, causing the drill to vibrate strongly. easily damaged

Therefore, under the current technical conditions, rotary drilling rigs are not suitable for drilling in hard rock formations, and the drilling depth is also limited to a certain extent.

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