Shield receiving forward-shift construction method of boulder group open excavation and embedment mutation space

A technology of open-cut and hidden-bury, construction method, applied in excavation, infrastructure engineering, earthwork drilling and other directions, can solve the problems of inability to carry out shield, receiving and forward movement, to eliminate the risk of downtime, facilitate construction, and speed up construction effect of speed

Active Publication Date: 2013-04-10
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In order to solve the problem that the traditional method cannot be used to receive the shield normally and move it forward to the station for hoisting out when encountering the shield tunnel construction i

Method used

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  • Shield receiving forward-shift construction method of boulder group open excavation and embedment mutation space
  • Shield receiving forward-shift construction method of boulder group open excavation and embedment mutation space
  • Shield receiving forward-shift construction method of boulder group open excavation and embedment mutation space

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specific Embodiment approach

[0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction method for open-cut and concealed burial of a group of isolated stones with abrupt space shield receiving and moving forward, comprising the following steps:

[0040] Step 1. Excavation of open cut and buried sections of isolated rock groups

[0041] A. Diaphragm wall grooves are constructed using hydraulic groovers; B. Glass fiber bars 1 are arranged at the receiving end of the shield, and steel bars are arranged in the rest of the area for concrete pouring; C. Steel supports are supported while excavating behind the construction of concrete supports; D. When the boulders are dug, artificial drilling is used to destroy them with expansion explosives; E. After excavation to the bottom, a receiving well 1 with a length of 10m is set at the end, and the bottom plate 2 of the open and buried section is started; F. After the construction of the side wall, open Construction of the roof 3 of the excavated buried...

example

[0050] The shield section between Furong Square Station and Wuyi Square Station on Changsha Metro Line 2 Line 7 is a complex karst stratum. The 100 meters connected to Wuyi Square Station is a karst trench, and there are a large number of boulder groups, especially excavated through the station. It was revealed that the boulders were large, with irregular distribution and high density. After the detailed geological survey, the 100-meter-long section with a large number of boulders was changed to open excavation and buried construction. After receiving the shield, it was moved forward by empty push Hoist out at the reserved hoisting opening at Wuyi Square Station.

[0051] Since the bottom plate of the open excavation and buried section is 1.6 meters higher than the receiving bottom plate of the shield machine, it is impossible to carry out the traditional movement before the shield machine receiving. By backfilling the receiving shaft with concrete to form a transitional surfac...

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Abstract

The invention relates to the technical field of tunnel shield construction and particularly provides a shield receiving forward-shift construction method of a boulder group open excavation and embedment mutation space. The problem that a shield cannot be normally received and hoisted out by shifting forward to a station by using the traditional method in conventional construction can be solved. The shield receiving forward-shift construction method comprises the following steps of: digging a boulder group open excavation and embedment section; forming a transition curve by a refilled receiving well as a large-slope curve with the open excavation and embedment section, and receiving and shifting forward the shield with the large-slope curve; and shifting forward the entire shield in the open excavation and embedment section, paving a back-up transition rail bar and a transition guide rail on the large-slope curve, shifting forward the entire shield by using a movable counter-force device and an oil cylinder of a shield machine, and shifting forward and respectively paving a forward-shift guide rail and a back-up forward-shift guide rail of a shield body on the open excavation and embedment section simultaneously. With the adoption of the shield receiving forward-shift construction method provided by the invention, the section tunneling mission is smoothly completed by the shield; a curve shield receiving process is started; and a technology of forward shifting the entire machine when the shield is backed up without the rail bar is innovated. The shield receiving forward-shift construction method has the advantages of simple process, low construction cost, flexible construction method and the like.

Description

technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a construction method for open-cut and concealed-buried mutation space shield tunnels of boulder groups to receive and move forward. Background technique [0002] With the rapid development of urban rail transit, most southern and coastal cities have also begun to build subways. However, the biggest difficulty in building subways in these places is that there are a large number of boulders in the interval. This kind of stratum is a forbidden area for shield tunneling construction. , Shield construction faces the risk of shield damage. [0003] However, in order to ensure construction safety, open excavation and concealed burial construction was adopted in the isolated rock group section from the station. In order to reduce investment, the bottom plate of the open excavated and buried section was at most 1.6 meters higher than the bottom plate of the shield ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/06E02D17/02
Inventor 王宗勇雷军毋海军赵香萍常鑫王剑
Owner CHINA RAILWAY 12TH BUREAU GRP
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