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Construction Method of Injecting Double Fluid Slurry in Access Hole of Shield Tunneling

A construction method and double-slurry technology, which can be used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of high cost and large construction volume, and achieve the effect of improving quality

Active Publication Date: 2018-09-11
国隧集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of shield tunnel entry and exit also has the problems of large construction volume and high cost. Using this method also has potential safety hazards.

Method used

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  • Construction Method of Injecting Double Fluid Slurry in Access Hole of Shield Tunneling
  • Construction Method of Injecting Double Fluid Slurry in Access Hole of Shield Tunneling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Injection of double liquid slurry in the hole of shield tunneling

[0054] The shield tunnel construction of a certain subway project in Guangzhou adopts the double-slurry construction method of the shield tunnel entering and exiting the present invention. The maintenance structure of the station at the receiving end is Φ1200 manual digging piles when the shield exits the tunnel.

[0055] Such as figure 1 and figure 2 As shown in the figure, the station maintenance structure 3 of the subway station 4 is shown in the figure. The construction process of the shield machine 5 on the station maintenance structure 3 is as follows: the shield machine 5 advances until the cutter head 6 enters the maintenance pile of the station maintenance structure 3 , pause the propulsion, and use the tunnel drilling rig to guide the hole from the distance of 800mm outside the maintenance pile of the station maintenance structure 3 to the position 200mm above the main body of the shield mac...

example 2

[0058] Cave door plugging and double slurry injection

[0059] In a project of Shenzhen Metro, the end of the shield machine was reinforced with double-tube high-pressure rotary grouting piles. During the tunneling process of the shield machine, the waterproof measures of the portal were damaged, sand gushing occurred at the portal, and the ground collapsed.

[0060] When a dangerous situation occurs, the construction method of the present invention is adopted for emergency rescue. After the ground hole is introduced to the sand gushing position, the ratio of cement slurry and water glass is adjusted so that the solidification time of the slurry is controlled within 25 seconds. Compared with injecting the slurry, after 2 minutes of injection, the slurry emerges from the sand gushing part, immediately suspends the grouting after the grout emerges, continues to inject after 15 seconds, and pauses again for 15 seconds after the sand gushing part emerges, and repeats the cycle for ...

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Abstract

The invention discloses a construction method of shield departure and reception binary slurry injection. The method comprises the following steps that construction preparation is performed; measurement and locating are carried out; drilling is performed; slurry is mixed; a shield tunneling machine is pushed; a binary slurry injection pump is used for injecting filling materials and additives into a slurry injection hole, and a cutter head of the shield tunneling machine rotates continuously in the slurry injection process; binary slurry is continuously injected, and the shield tunneling machine begins to be pushed forwards after friction force between a wrapped shield tunneling machine and surrounding soil is larger than a set value; the binary slurry is continuously injected when the shield tunneling machine is pushed; after the slurry is solidified, a tunnel portal continues to be broken till the cutter head of the shield tunneling machine is completely disengaged from a station maintenance structure. The construction method of shield departure and reception binary slurry injection is applicable to all stratums, long-time slurry grouting reinforcement is not needed, complement grouting is not needed during tunnel portal construction; enough pushing counter force can be provided when the slurry wraps the shield body, and the shield tunneling machine departure and reception section molding tunnel quality is effectively improved; the equipment is simple, conveying is easy and convenient, materials are efficiently utilized, and the material cost is saved.

Description

technical field [0001] The invention belongs to the field of shield tunnel construction, and in particular relates to a construction method for injecting double liquid slurry into and out of a shield tunnel, which is suitable for any formation. Background technique [0002] The entrance and exit of shield tunnels in shield tunnel construction are high-risk construction nodes that are prone to accidents in shield tunnel construction. At present, the entrance and exit of shield tunnel construction in China mainly adopt the measures of pre-reinforcement construction at the end and waterproof system of the entrance. The existing technology cannot meet the requirements of safe, economical and efficient construction, mainly because the quality of the end reinforcement is difficult to guarantee, the construction period is long, the construction cost is high, and the ground is prone to mud and sand leakage, and even causes landslides when the shield machine enters and exits the hole....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/08E21D11/10
Inventor 黄珍顾金兴梁远波刘永威
Owner 国隧集团有限公司
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