Construction method for super-long high-precision horizontal drilling

A technology of horizontal drilling and construction methods, applied in directional drilling, earthwork drilling, mining equipment, etc., can solve the problems of low drilling accuracy and achieve the effect of ensuring hole formation, stability and construction safety

Active Publication Date: 2008-04-09
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of low drilling accuracy existing in the existing ultra-long horizontal drilling construction, and to provide a construction method for ultra-long, high-precision horizontal drilling

Method used

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  • Construction method for super-long high-precision horizontal drilling
  • Construction method for super-long high-precision horizontal drilling
  • Construction method for super-long high-precision horizontal drilling

Examples

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Embodiment

[0058] Taking the ultra-long horizontal drilling construction in an underground tunnel pre-reinforcement project as an example, the project uses HW-4 horizontal tunnel drilling rigs with a torque of 3500kN.m, a feed force of 160kN, and a speed of 60, 85, and 125r / min. Drive the special slant plate drill bit for directional drilling with built-in check valve connected to the drill pipe to rotate the coring hole, use the BW-250 / 70 mud pump to pump out the drill cuttings produced during the drilling process, and select the model The directional drilling guide device for DITRACK is installed at the end of the drill bit, and it plays a guiding role together with the drill bit to ensure timely deviation correction during the drilling process, and finally form an ultra-long, high-precision horizontal drill hole.

[0059] The drill pipe used is a freezing tube of φ108×8mm. The shape of the thread opening at the joint is "V", which is made of steel pipes. A one-way valve and a sealing ...

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Abstract

The invention discloses a super-long and high-accurate horizontal boring construction plan. The plan is that a proper horizontal borer is used for driving a bit connected with a bore rod to turn to take cores and cut holes; a guiding device is used for controlling a decline rate; a slurry pump is used for pumping out the bore scraps generated in a boring process, so as to form a set-caliber super-long and high-accurate horizontal boring. The invention adopts a compound connection measure of combining a screw connection and a welding connection to connect the bore rod, guaranteeing the concentricity and sealing of the bore rod. When in a horizontal boring process, a freezing cut sealing and a freezer sealing are adopted. An area ranging from 8cm to 10cm is preserved as a safety layer in a tube-boring process on a concrete wall. And a strict deviation measuring and a deviation controlling are adopted to guarantee the construction safety. The form and improvement of the construction plan of the invention experiences many tests, researches and improvements, and a horizontal frozen boring bored through the construction plan of the invention can be provided with a high accuracy even when a construction horizontal length is too long.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for super-long and high-precision horizontal drilling before the tunnel is horizontally frozen. Background technique [0002] During the construction of urban underground projects such as subway tunnels, the rock and soil in the tunnels are easily softened and disintegrated when exposed to water, and their self-stability is poor. Quicksand or even landslides are prone to occur during construction, causing safety accidents and affecting ground transportation and buildings. In order to ensure construction safety and reduce the impact on the surrounding environment, it is necessary to pre-reinforce the rock and soil in the tunnel before construction. At present, the commonly used pre-reinforcement method is to use horizontal freezing construction, that is, first arrange horizontal freezing holes around the tunnel, and circulate low-temperature salt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21D9/10
Inventor 李远平丁睿唐宇田李应战肖平杨祖恩
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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