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Shallow-buried large-span water conveying tunnel three-stage five-step digging method

A technology for excavating water tunnels and steps, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of prominent construction safety risks, long excavation cycle period, and small excavation forming section, so as to improve the excavation efficiency. Effects on cycle time, ensuring safety and occupational health, and reducing labor intensity

Active Publication Date: 2013-06-26
SINOHYDRO BUREAU 14 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used excavation methods have many procedures, small excavation section, low degree of mechanization, mostly manual excavation, long excavation cycle, large deformation of surrounding rock, high construction cost, and prominent construction safety risks

Method used

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  • Shallow-buried large-span water conveying tunnel three-stage five-step digging method
  • Shallow-buried large-span water conveying tunnel three-stage five-step digging method

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Embodiment Construction

[0019] Three-step five-step excavation method of the present invention is carried out according to the following steps:

[0020] 1) One-step excavation (1 in the illustration): advance support of the upper half of the hole, and excavation of the upper steps: excavate along the tunnel design contour line with the excavator, reserve the core soil 2, and spray concrete on the excavation surface Close, erect the steel arch frame, place concrete prefabricated blocks at the foot of the arch frame, lay steel mesh sheets, install locking foot anchor pipes, and spray concrete to the design thickness;

[0021] 2) Two-step excavation: Excavation of channel 3 in the middle of the tunnel to ensure excavation of slag and traffic at the upper steps, excavation of the central channel into a descending slope, and reserve soil for the side walls on both sides;

[0022] 3) Three-step excavation: Excavation of the left wall 7 of the tunnel, and then the steel grid of the side wall is firmly conne...

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Abstract

The invention discloses a shallow-buried large-span water conveying tunnel three-stage five-step digging method which comprises the steps of 1) first-step digging, namely performing forepoling on an upper half tunnel, and digging an upper stage; 2) second-step digging, namely digging a pull trough in the middle of the tunnel; 3) third-step digging, namely digging and supporting the left wall of the tunnel; 4) fourth-step digging, namely digging and supporting the right wall of the tunnel; and 5) fifth-step digging, namely digging and supporting the edge wall of a lower stage. By adopting the digging method, region-by-region digging is effectively executed, overlapping of spaces and time of working procedures are fully used, the digging time periods of the working procedures are rationally used, and the deformation in the tunnel is reduced; and a lining can be quickly closed to form a ring. By adopting the digging method, the digging safety risk is effectively reduced, the digging working efficiency is improved, the digging and supporting closing time is shortened, and the deformation in the tunnel is effectively reduced.

Description

technical field [0001] The invention belongs to the technical fields of water conservancy and hydropower, highways, railways, municipal engineering, etc., and specifically relates to a three-step and five-step excavation method for a shallow buried large-span water conveyance horseshoe-shaped tunnel. Background technique [0002] At present, the commonly used "shallow burial and underground excavation methods" in China mainly include: step method, CD method, CRD method, PBA method, three steps and seven steps method. However, the commonly used excavation methods have many procedures, small excavation section, low degree of mechanization, mostly manual excavation, long excavation cycle, large deformation of surrounding rock, high construction cost, and prominent construction safety risks. Contents of the invention [0003] The purpose of the present invention is to ensure the safety of tunnel excavation, and to provide a three-step five-step excavation method for shallow-bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00
Inventor 史雁飞徐元亭刘洪卫范超杰林志斌孙维忠朱先武吴庆杰刘泽敏张进良
Owner SINOHYDRO BUREAU 14 CO LTD
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