Construction method for undermining connected channel between shield sections in water-rich sand cobble stratum tunnel

A communication channel and construction method technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as loose structures, high excavation risks, and poor self-stability of the ground

Active Publication Date: 2016-10-26
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for subterranean excavation of the shield section communication channel in the water-rich sand and pebble formation tunnel, which overcomes the problems of loose structure of the water-rich sand and pebble formation, poor self-stability of the formation, and high excavation risk. Under the circumstances, carry out the underground excavation construction of the communication channel in the shield section and strictly ensure the construction quality

Method used

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  • Construction method for undermining connected channel between shield sections in water-rich sand cobble stratum tunnel
  • Construction method for undermining connected channel between shield sections in water-rich sand cobble stratum tunnel
  • Construction method for undermining connected channel between shield sections in water-rich sand cobble stratum tunnel

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Embodiment 1

[0081] The construction method of the underground excavation of the communication channel of the shield section in the water-rich sand and pebble stratum tunnel of the present embodiment, such as figure 1 Shown, mainly realize through following technical scheme: comprise the following steps:

[0082] Step A: construction preparation;

[0083] Step B: construction of dewatering well;

[0084] Step C: Carry out stratum grouting reinforcement to the strata around the segment at the interface of the communication channel;

[0085] Step D: Carry out pre-measurement and line drawing of the segment removal part for the segment at the interface of the communication channel;

[0086] Step E: Erection of temporary steel supports at the communication channel;

[0087] Step F: Build the pipe shed and carry out grouting reinforcement of the pipe shed;

[0088] Step G: Cut the segment removal part and monitor the deformation of the segment and the settlement of the vault in real time; ...

Embodiment 2

[0098] This embodiment is further optimized on the basis of the above-mentioned embodiments. The construction of the dewatering well in the step B specifically includes the following steps in sequence:

[0099] Step B100: install a percussion drilling rig according to the location of the dewatering well; the percussion drilling rig in the step B100 is a CZ-22 percussion drilling rig;

[0100] Step B200: Check the location of the dewatering well, and after confirming that it is correct, manually excavate 0.5m, and bury the retaining pipe;

[0101] Step B300: After the retaining pipe is buried, use a percussion drill to drill a hole with a diameter of 600mm. At the same time, use mud to protect the wall to maintain the height of the mud in the hole and prevent the hole from collapsing. The hole will be formed when the drilling depth reaches the design value;

[0102] Step B400: After the hole is formed, vertically lower the reinforced concrete well pipe with an inner diameter of 3...

Embodiment 3

[0110] This embodiment is further optimized on the basis of the above-mentioned embodiments. The step C specifically refers to firstly opening the grouting port of the segment near the communication channel for observation, and after confirming that there is no abnormality, check the connection between the communication channel and the shield section. supplementary grouting for the reinforcement segment; the reinforcement segment refers to each of the 7 segments installed front and rear along the axis of the communication channel, a total of 14 segments; the supplementary grouting starts from the center of the communication channel Carry out ring-by-ring on both sides, multiple grouting ports are re-injected at the same time, and the grouting ports are kept as symmetrical as possible and the deformation of the reinforcement segment is observed and monitored throughout the process; the stratum used for grouting reinforcement The grouting slurry is a cement-water glass double liq...

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Abstract

The invention discloses a construction method for undermining a connected channe between shield sections in a water-rich sand cobble stratum tunnel. The construction method comprises steps of preparing for construction, constructing for a precipitation well, performing grouting reinforcement on stratum around a segment of a connection port of the connected channel, performing pre-measurement line drawing for a segment dismounting part on the segment of the connection port of the connected channel, setting up a temporary steel support at the connected channel, setting up a pipe shed and performing pipe shed grouting reinforcement, cutting the segment dismounting part and monitoring segment deformation and vault crown settlement conditions in real time, beginning to perform earth rock excavation and initial stage support of the connected channel, performing earth rock excavation and initial stage support of a pump house, performing waterproof construction of the connected channel, performing secondary lining for the connected channel and the pump house and second lining back grouting, dismounting the steel support and cleaning the site, and accepting check. The construction method of the invention is applicable to the construction of the water-rich sand cobble stratum connected channel, is reasonable and strict in layout, safe in construction process and multiply guaranteed in construction quality.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for submerged excavation of a communication channel in a shield section in a tunnel in a water-rich sand and pebble stratum. Background technique [0002] In the subway tunnel construction project, in order to meet the needs of emergency evacuation and drainage, it is necessary to set up communication channels and wastewater pumping stations in the shield section. The construction risk of the communication channel is relatively high, and it has always been the accident-prone part of the subway construction. Communication channel accidents can easily lead to damage to ground cables and buildings, and even endanger the entire subway line. Therefore, the communication channel construction plays a pivotal role in shield tunneling construction. [0003] However, for water-rich sand and pebble formations, the risk of excavation is high due to the loose struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18E21D11/38
CPCE21D11/105E21D11/18E21D11/38
Inventor 梁朋刚苏春生何十美汤振亚
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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