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Method for improving full-section muck in silt soil layer during construction of contact channel pipe jacking machine

A communication channel and muck improvement technology, applied in earth-moving drilling, chemical instruments and methods, tunnels, etc., can solve the problems of tunnel structure instability, casualties and property losses, avoid slurry blockage, and improve improvement efficiency. , The effect of preventing the consolidation of slag

Pending Publication Date: 2021-12-10
浙江杭海城际铁路有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale gushing is likely to cause the instability of the tunnel structure, resulting in heavy casualties and property losses

Method used

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  • Method for improving full-section muck in silt soil layer during construction of contact channel pipe jacking machine
  • Method for improving full-section muck in silt soil layer during construction of contact channel pipe jacking machine
  • Method for improving full-section muck in silt soil layer during construction of contact channel pipe jacking machine

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1 of the present application provides a method for improving full-section muck in the silt soil layer constructed by a pipe jacking machine in a communication channel, which includes the following steps:

[0037] 1. Determination of slag improver

[0038] 1) In the construction preparation stage of the pipe jacking method of the connecting channel, within the scope of the ring beam of the opening door, use the geological survey report to determine the soil properties and permeability within the excavation range of the pipe jacking machine, and select the type and proportion of the muck modifier .

[0039] 2) Use bentonite modifier (bentonite solution + polymer coagulant) for the water-rich silt layer to reduce the permeability coefficient of the water-rich formation. In the water-rich silt layer, the ratio of bentonite solution to polymer coagulant in the bentonite modifier is controlled at 1400:1. The ratio of bentonite to water in the bentonite solution i...

Embodiment 2

[0051] 1. Project overview

[0052] The shield section of the Hangzhou-Hai Intercity Railway is Yuhang High-speed Railway Station-Xucun Town Station (referred to as: Yu-Xu Tunneling Section). The right line of the ~Xu Shield section is 3126.555m long, the starting mileage: YDK0+437.570, the end mileage: YDK3+563.847, and the long chain is 0.278m. The minimum curve radius of the line is 800m, the maximum curve radius is 4000m, the buried depth of the tunnel is 7.6m~25m, the line spacing is 10.8~16m, and the maximum longitudinal slope is 28‰. The shield section includes 1 intermediate air shaft and 5 communication passages: 1 of which is jointly built with the intermediate air shaft, and 1 is jointly built with the pump room, and 3 of the communication passages are constructed by the pipe jacking method.

[0053] In this section, three mechanical communication channels are set up at left DK0+762.798 (right DK0+760.000), right DK1+237.420 (left DK1+239.019), and right DK1+800.00...

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Abstract

The invention relates to a method for improving full-section muck in a silt soil layer during construction of a contact channel pipe jacking machine. The method comprises the following steps of: S1, determining a muck improver; S2, performing an indoor test; S3, mixing the muck improver on site; and S4, performing site construction. The method has the beneficial effects that the muck is improved by adopting a bentonite improver (a bentonite solution and a high-molecular flocculant), a high-molecular polymer solution has relatively high adhesion and can well absorb soil moisture, and the permeability coefficient of the muck is changed through cutter head cutting and screw machine stirring, so that the muck is fully improved. The improved muck is not easy to gush and cake, the permeability of the muck in a soil bin is effectively reduced, and the gushing is further inhibited, so that shield tunneling is smooth and efficient, the shutdown time is shortened, the muck in a screw machine is prevented from being solidified, and the construction safety and smoothness are guaranteed.

Description

technical field [0001] The invention relates to the technical field of subway communication channel construction, in particular to a method for improving full-section dregs in the silty soil layer constructed by a pipe jacking machine in the communication channel. Background technique [0002] A communication channel needs to be set in the middle of the uplink and downlink tunnels of urban rail transit. Its main function is to connect the uplink and downlink tunnels of the subway. It can be used for evacuation of people in emergency situations, and can also be used as a life channel for emergency rescue, and it also takes into account the water collection and drainage of the tunnel. For a long time, tunnel construction techniques such as mining method excavation have been adopted in urban rail communication channels, supplemented by grouting or freezing reinforcement to ensure the stability of surrounding rock during tunnel excavation, but this construction method has natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06C01B33/40
CPCE21D9/0678C01B33/40
Inventor 邓建林李海波赵星星余秀平狄鹏郝建雷刘阳刘晓波朱洪健张永南杨吉胡帅李治家张驰
Owner 浙江杭海城际铁路有限公司
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