Guiding horizontal jet grouting pile pre-support construction method for scattered particle rock surrounding tunnel

A technology of horizontal rotary jetting pile and construction method, applied in tunnels, tunnel linings, drilling equipment and methods, etc., can solve problems such as sand leakage and collapse, and achieve the effects of accelerating construction speed, convenient construction and reasonable structure

Active Publication Date: 2011-11-23
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method for the pre-supporting of tunnel-guided horizontal jet grouting piles in granular surrounding rocks, wh...

Method used

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Embodiment Construction

[0013] A construction method for the pre-supporting of tunnel-guided horizontal jet grouting piles in granular surrounding rock, comprising the following steps:

[0014] The first step, construction preparation:

[0015] 1. Check whether the drilling rig and high-pressure grouting pump are running normally, and whether the drilling tools and tools are complete.

[0016] 2. Set up the working room: the length and height of the working room are determined according to the length and height of the horizontal jet grouting pile machine. The length of the on-site horizontal jet grouting pile drilling rig is 7.5m, and the length of the working room is 8m; the height of the drilling rig is 0.5m, and the height of the working room is set at the height of the drilling rig plus 1 / 2 of the pile diameter. Its function is to provide working space for the horizontal jet grouting pile drilling rig.

[0017] 3. Measure and set out the pile position: measure and mark the tunnel excavation con...

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Abstract

The invention discloses a guiding horizontal jet grouting pile pre-support construction method for a scattered particle rock surrounding tunnel. The method comprises the following steps of: drilling a guide hole with precision of more than 0.5 percent by adopting a horizontal directional drilling machine, retracting a drill rod by rotating after the guide hole is drilled to the design length, andspraying the prepared cement paste to the soil through the drill rod under the pressure of 35 to 40MPa while retracting the drill rod. Jet stream cuts the soil with huge impact force, soil particles are forcibly stirred and mixed with the cement paste, and a horizontal cylindrical cement soil solidified body, namely a horizontal jet grouting pile, is formed after cementing and hardening. After the jet grouting piles are mutually engaged, a closed horizontal jet grouting curtain body for forming an ultra pre-support is formed at the outer side of an arch of the tunnel in a concentric circle form, so that collapse caused by sand leakage is effectively prevented; and the cost is low, and the construction speed is greatly quickened when the safety is ensured.

Description

technical field [0001] The invention relates to a construction method of a granular surrounding rock tunnel project, in particular to an advanced pre-supporting construction method suitable for tunnel excavation in loose, weak and unstable geology such as sand layers and aeolian sand layers. Background technique [0002] For long-distance, ultra-shallow buried, large-section, and granular surrounding rock tunnels, because the aeolian sand particle size at the passage of the tunnel body is ultra-fine sand, it has uniform particle size, strong water permeability, and almost no stickiness. Polymerization, dense stacking, poor grouting permeability and other characteristics. For such tunnels with unfavorable geological scales, there is no systematic, complete and standardized advanced pre-support construction method at home and abroad that can be used for reference. Contents of the invention [0003] The object of the present invention is to provide a construction method for ...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21B7/02
Inventor 何复生朱家稳蔡爽杨勇王声扬吴文彪石伟张琳王国炜罗飚胡光全陈艳林杨兴林杨全勇
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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