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Subsidence control system and method for tube curtain construction of existing shield tunnel under short distance

A technology for shield tunneling and settlement control, which is applied in tunnels, earthwork drilling, mining equipment, etc., to achieve easy operation, good settlement control effect, and good economic and social benefits

Active Publication Date: 2018-02-06
CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a system and method for controlling the settlement of the pipe curtain construction of the existing shield tunnel under the short distance, which solves the difficult problem of the subsidence control of the soil above the excavation section of the mining method when passing under the existing shield tunnel

Method used

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  • Subsidence control system and method for tube curtain construction of existing shield tunnel under short distance
  • Subsidence control system and method for tube curtain construction of existing shield tunnel under short distance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: A lock tube curtain steel pipe 7 with an outer diameter of 300 mm and a length of 42 meters is pushed into the soil under the existing shield tunnel 1 in front of the upper end wall 5. During the jacking process, auger The distance between the top end of the rod 9 and the outer end surface of the right port of the lock tube screen steel pipe 7 is maintained at 10 cm, and the volume of the push-in is 3.192 cubic meters, and all the soil in the lock tube screen steel tube 7 is taken out In the measuring soil bucket 11, the measured soil volume is 4.8 cubic meters, and the monitored settlement of the existing shield tunnel 1 is 0.6 mm;

Embodiment 2

[0030] Example 2: Push a lock pipe curtain steel pipe 7 with an outer diameter of 300 mm and a length of 42 meters into the soil under the existing shield tunnel 1 in front of the upper end wall 5, and the end of the spiral drill pipe 9 The end face is in the same cross-section as the outer end face of the right port of the locking tube screen steel pipe 7, and the jacked-in volume is 3.192 cubic meters. The soil body of the locking tube screen steel tube 7 is taken out into the measuring soil bucket 11, and the soil mass is measured. The volume is 5.6 cubic meters, and the settlement of the existing shield tunnel 1 obtained by monitoring is 1.4 mm;

Embodiment 3

[0031] Example 3: Push a lock pipe curtain steel pipe 7 with an outer diameter of 300 mm and a length of 42 meters into the soil under the existing shield tunnel 1 in front of the upper end wall 5, and the end of the spiral drill pipe 9 Extending 10 cm from the outer end surface of the right port of the locking tube screen steel pipe 7, the volume of the jacked-in is 3.192 cubic meters, and all the soil body of the locking tube screen steel tube 7 is taken out into the measuring soil bucket 11, and the soil mass is measured. The volume is 6.8 cubic meters, and the settlement of the existing shield tunnel 1 is 2.0 mm.

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Abstract

The invention discloses a pipe curtain construction settlement control system and method for close-range underpassing of an existing shield tunnel. The system and the method solve the problem that in underpassing of an existing shield tunnel, settlement of a soil body above an excavation section is difficult to control in a mining method. According to the system and the method, a lock catch pipe curtain is arranged in an upper end wall (5) of an interval civil defense section tunnel (4) and located under the existing shield tunnel (1), steel pipe jacking equipment (8) is arranged between the lock catch pipe curtain and a right-angle back wall (6) of the excavated interval civil defense section tunnel (4), a metering soil bucket (11) is arranged below a soil outlet of the steel pipe jacking equipment (8), a lock catch (14) is arranged between every two adjacent lock catch pipe curtain steel pipes (7), sleeve valve pipes (12) are fixedly welded to the outer side walls (2) of the lock catch pipe curtain steel pipes (7), and a bentonite grout injector (13) is connected to grout inlets of the sleeve valve pipes (12). Existing field equipment is utilized, and the settlement control effect is good.

Description

Technical field [0001] The invention relates to a system and method for controlling the settlement of the soil above the excavated tunnel when using a mining method to excavate a subway tunnel, and in particular to a system and a method for controlling the settlement of the soil above the excavated tunnel when using the mining method to excavate a subway tunnel. A settlement control system and method for tube curtain construction to control the settlement of the existing shield tunnel when a new tunnel is excavated. Background technique [0002] In the construction of urban subways, there are more and more cases of tunnels passing through existing lines at close distances. When the existing line is a shield tunnel, since the structure of the shield tunnel is composed of flexible segments, the segments are connected by high-strength bolts to form an integrated flexible structure. When the soil under the shield tunnel is disturbed , The segment within the disturbance range will pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
CPCE21D9/005
Inventor 罗文江高崇王汉霆王云龙赵辉李建
Owner CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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