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Rotary drilling method for hard rocks

A rock formation and barrel drilling technology, which is applied in the direction of drill bits, drilling equipment, earthwork drilling, etc., can solve the problems that rotary drilling cannot be applied to high-strength hard rock formations, and achieve significant economic benefits, reduce costs, and save construction time.

Inactive Publication Date: 2016-12-21
CCTEB INFRASTRUCTURE CONSTR CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method of rotary drilling in hard rock formations to solve the problem that existing rotary drilling drills cannot be used in high-strength hard rock formations

Method used

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] (1) Construction preparations

[0031] 1) Research and analysis of engineering geology

[0032] Before construction, the geological survey data will be analyzed in detail, and the geological conditions and characteristics will be summarized. For lithology and geology, it is necessary to understand the development of karst caves, the origin and type of rocks, the size and shape of rock particles, the development of rock structures and fissures, and the ...

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Abstract

The invention discloses a rotary drilling method for hard rock strata, which comprises the following steps: (1) construction preparation; (2) measuring and placing pile positions; (3) processing and embedding of pile foundation steel casings; (4) rotary drilling rig Centering in place; (5) Mud preparation and circulation; (6) Drill pipe and bit type and selection; (7) Rotary drilling construction: set a wedge-shaped drill bucket on the barrel drill, using the wedge-shaped pressurization principle, wedge-shaped The pressure of the drill bucket produces radial component force on the core, and finally breaks the rock; when drilling, first use the small-diameter pick barrel core bit to loosen the core in the hole, and use the large-diameter double-bottom The rock-socketed rotary drilling bucket sweeps the hole, the pick cylinder drill bit and the double-bottom rock-socketed rotary drilling bucket are used alternately until the designed hole depth is reached; (8) Judgment and inspection of the final hole; (9) Clearing the hole; (10) Hanging the reinforcement cage and pouring underwater concrete. The invention has high rock-entry efficiency, high safety, good hole-forming quality and remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a rotary drilling method for hard rock formations. Background technique [0002] In recent years, rotary drilling has been widely used in the construction of bridges, subways, underground passages and other municipal engineering pile foundations due to its advantages of high efficiency, flexible movement, environmental protection, good pile quality, and wide adaptability to strata. However, rotary drilling rigs are generally suitable for cohesive soil, silt, sandstone, gravel soil, loess and other geology. With the vigorous development of subway construction nationwide, subway stations are generally two or three floors underground. The rock requirements are high, and the application of rotary drilling rigs is limited. Contents of the invention [0003] The object of the present invention is to provide a rotary drilling method for hard rock formatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E21B25/10E21B10/00
CPCE02D5/38E21B10/00E21B25/10
Inventor 宋芃黄泉钦唐花莲林建郭宇航
Owner CCTEB INFRASTRUCTURE CONSTR CO LTD
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