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Synchronous grouting grout for shield construction control and grouting method thereof

A technology of simultaneous grouting and grouting, which is used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of long setting time, large volume shrinkage, unstable segment structure, etc., and achieve the effect of meeting safety requirements.

Inactive Publication Date: 2013-11-20
CHINA RAILWAY SHISIJU GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through retrieval of prior art and patent literature, it is found that the existing active slurries at home and abroad all have long coagulation time (more than 10h), low strength of consolidated body (28d compressive strength<1.0MPa), volume shrinkage (consolidation The shrinkage rate is greater than 5%) and other shortcomings
Therefore, the surface settlement cannot be well controlled, making the segment structure unstable

Method used

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  • Synchronous grouting grout for shield construction control and grouting method thereof
  • Synchronous grouting grout for shield construction control and grouting method thereof
  • Synchronous grouting grout for shield construction control and grouting method thereof

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Embodiment Construction

[0012] The mortar mixing station is used to mix the slurry. When actually mixing the slurry, first set the weighing weight in the computer of the mixing station according to the mixing ratio of the slurry, and send the weighed raw materials into the mixing tank, and use the mechanical forced mixing method to mix. The quality of grouting liquid and mortar mixing meets the requirements of the Ministry of Construction JGJ70-2009 "Test Methods for Basic Properties of Building Mortar".

[0013] In Figure 1, it is the mortar configured according to the ratio of the slurry. The mortar is in a flow-plastic state and can be transported to the shield machine for use. The grouting system of the shield machine is injected into the space behind the shield shell and outside the segments for filling. See Figure 2 for the mortar effect after filling and setting.

[0014] Construction example:

[0015] The geological conditions in the section 10 of the second phase of Beijing Metro Line 8 ar...

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Abstract

The invention relates to high-performance synchronous grouting active grout for shield construction control. The high-performance synchronous grouting grout is characterized in that the mass ratio of cement to pulverized fuel ash to bentonite to sand to water is 281:374:140:421:584, wherein the cementer is P.O42.5, the pulverized fuel ash is II-stage, the bentonite is sodium-stage, the sand is fine sand, the water is drinking water; the initial setting time of the grouting active grout prepared at a mass ratio is 5.5 hours, the final setting strength is 3.9MPa, the decantation rate is 3%, the stone rate is 3%, and the thickness is 11cm. The grouting active grout has the characteristics of short setting time, high solidification strength, good stability and high filling rate and can be used for effectively controlling ground surface settlement above tunnels, and a synchronous grouting system of a shield tunneling machine does not need to be specially transformed.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and mainly proposes a synchronous grouting slurry for controlling ground subsidence during construction of an earth pressure balance shield machine, which is a cement mortar with fast setting speed, high strength and small shrinkage rate. Background technique [0002] The shield method is a construction method that uses a shield machine to excavate a tunnel below the ground. During the shield construction process, the cutterhead at the front of the shield machine rotates to excavate the soil for excavation. Under the protection of the shield shell, the segment assembly machine is used to assemble the segments to form a tunnel support structure. After the segments are removed from the shield shell, they are then The synchronous grouting system at the tail of the shield injects grout into the gap between the segment and the formation to fill the gap between the segment and the fo...

Claims

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Application Information

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IPC IPC(8): C04B28/04E21D11/10
Inventor 付仁鹏周庆合隽方庆徐喜荣王刚于伟
Owner CHINA RAILWAY SHISIJU GROUP CORP
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