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Back pea gravel blow filling grouting construction method for single-shield hard rock roadheader after installing TBM pipe piece

A technology of a hard rock roadheader and a construction method, which is applied to shaft equipment, earth-moving drilling, wellbore lining, etc., can solve the problems of segment floating, large shrinkage rate, blocking shield, etc., and achieve the effect of avoiding pipe blockage and slurry return.

Inactive Publication Date: 2016-06-08
CHINA RAILWAY 18TH BUREAU GRP CO LTD +1
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  • Abstract
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Problems solved by technology

[0002] According to the survey, most of the domestic and foreign urban rail transit tunnel boring machines are constructed by shield machines, and the gap between the segment and the excavated wall is backfilled by synchronous cement mortar behind the segment. This method exists. There are many common quality problems such as slurry return, stuck shield, segment floating, blocked tube, large shrinkage and voids, and there is no effective way to overcome them

Method used

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  • Back pea gravel blow filling grouting construction method for single-shield hard rock roadheader after installing TBM pipe piece
  • Back pea gravel blow filling grouting construction method for single-shield hard rock roadheader after installing TBM pipe piece

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Embodiment Construction

[0016] A construction method for dredging and grouting construction of pea-gravel behind the back of a single-shield hard rock tunneling machine TBM segment after installation, comprising the following steps:

[0017] 1. Do a good job of measurement acceptance and index detection for materials such as cement, pea gravel, and sand entering the site. The construction test mix ratio must be tested in the early stage, and the construction shall be carried out according to the construction mix ratio approved by the supervision engineer.

[0018] 2. Carry out performance tests on bean gravel dredging and grouting equipment, benches, etc., especially the air compressor and bean gravel jetting machine should be tested for wind pressure and air volume to meet the capacity of bean gravel dredging and filling; grouting pumps should be tested for water pressure , Check whether the status of the instrument is normal; the accuracy of the automatic control system of the high-speed pulping ma...

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Abstract

The invention discloses a back pea gravel blow filling grouting construction method for a single-shield hard rock roadheader after installing a TBM pipe piece. The back pea gravel blow filling grouting construction method comprises the following steps: (1) reserving a pea gravel blow filling and grouting hole in a pipe piece; (2) blow filling pea gravels at the bottom arch of the pipe piece, and meanwhile, pouring cement slurry into the bottom arch; (3) blow filling pea gravels to the two sides and the top part of the pipe piece, and meanwhile, pouring cement slurry into the two sides and the top part of the pipe piece; (4) plugging a grouting hole; and (5) testing the quality. The back pea gravel blow filling grouting construction method uses pea gravel blow filling and cement paste pouring to replace single cement mortar pouring, ensures the pipe piece not to occur the phenomena of upward floating, sinking and staggered platform after being installed and meanwhile, prevents a series of quality common problems of tube plugging, slurry returning and the like.

Description

technical field [0001] The invention belongs to a construction method for urban rail transit and subway tunnels, in particular to a construction method for blowing and grouting construction with pea gravel behind the installation of a single-shield hard rock tunnel boring machine TBM segment. Background technique [0002] According to the survey, most of the domestic and foreign urban rail transit tunnel boring machines are constructed by shield machines, and the gap between the segment and the excavated wall is backfilled by synchronous cement mortar behind the segment. This method exists. There are many common quality problems such as slurry return, stuck shield, segment floating, blocked tube, large shrinkage and voids, and there is no effective way to overcome them. The surrounding rock of Tongluoshan Tunnel in the second phase of Chongqing Rail Transit Line 6 is mainly sandy mudstone and sandstone, and the segment lining is adopted. How to avoid backfilling and grouting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D9/06
Inventor 何良波郭惠川李建华王赟张湘涛
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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