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Method for processing isolated stone groups in shield excavation karren section

A processing method and technology for boulders, applied in the field of detection and processing of boulder groups in shield tunneling, can solve problems such as the inability to accurately detect boulder groups and quickly process boulder groups, achieve novel processing methods, ensure fast passage, and process efficiency high effect

Active Publication Date: 2012-06-27
2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP +1
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AI Technical Summary

Problems solved by technology

[0018] In order to solve the problem that the boulder group cannot be accurately detected and processed quickly when using the traditional method to process the boulder group, the present invention provides a method for processing the boulder group in the solitary ditch section of shield excavation

Method used

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Examples

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Effect test

example

[0096] This method of pretreatment of boulder groups in the melting ditch section of shield excavation is used in the section from Furong Square Station to Wuyi Square Station of Changsha Metro Line 2. There is a 200-meter melting ditch in this section. , After using the cross-hole high-density resistance detection to determine the boulder, the ground drilling and blasting pretreatment is performed, the blasting effect is good, the risk is controllable, and the shield construction speed is fast after treatment.

[0097] Promotion

[0098] In addition to the accurate detection of boulders, this technology is especially advanced and reliable by using ground blasting pretreatment technology. After the successful application on the left line, it was extended to the right line of the same interval. The length of the melting ditch on the right line of this interval is 320 meters, and there are more boulder groups and better results have been achieved. Practice has proved that this ...

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Abstract

The invention relates to a technology for detecting and processing isolated stone groups in the shield excavation karren section, in particular to a method for processing isolated stone groups in the shield excavation karren section, aiming to solve the problems that the isolated stone groups can not be detected accurately and processed rapidly by using the traditional method. The method comprises the following steps: finding out the section probably having the isolated stone groups according to a geological survey report; arranging testing holes along the longitudinal direction of a tunnel in the section having the isolated stone groups, putting PVC (polyvinyl chloride) pipes in the testing holes, disposing dense small holes on the walls of the PVC pipes, sealing the bottom ends of the PVC pipes, filling the testing holes with water, arranging electrodes in the PVC pipes in the adjacent two holes, detecting by crossing holes and collecting data by using a high-density resistivity instrument, and determining the position of the isolated stone; optimizing a blasting design, positioning blasting charges accurately by using a counter weight, blasting the holes at the periphery of the isolated stone first to squeeze to generate a space, and then blasting the holes row by row. The method is used for detecting the isolate stone accurately, adopts a simple process, uses the blasting technology to ensure that the biggest blasted isolated stone is less than 25cm, avoids the secondary blasting and has high isolated stone processing efficiency.

Description

technical field [0001] The invention relates to a technology for detecting and processing boulder groups in shield excavation, in particular to a method for processing boulder groups in a melting ditch section of shield excavation. Background technique [0002] China's urban subway construction has entered a stage of rapid development. In the southern region, almost all subway construction encounters boulder groups, and there are also boulders in coastal cities or alluvial strata. The use of boulder treatment is a key technology for shield construction. It is not only safe It is an important means of risk control, and it is also a shortcut to improve construction efficiency. However, the existing boulder detection and processing technology can never guarantee the accuracy and processing effect of boulder detection, which brings huge risks to shield construction. [0003] At present, the boulder group in the subway construction uses the ground to manually dig holes and punch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06F42D1/08
Inventor 王宗勇雷军赵香萍毋海军
Owner 2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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