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Product-stable cement-water glass double-liquid grouting material for shield synchronous grouting

A synchronous grouting and double-liquid grouting technology, applied in the field of grouting materials, can solve the problem of endangering the safety and waterproof performance of the segment lining structure, reducing the compressive strength and impermeability pressure of the segment, and limiting the cement-sodium silicate double liquid problems such as slurry application, to avoid appearance cracking, reduce the risk of leaching, and increase the degree of dispersion

Pending Publication Date: 2020-12-04
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to generate shear force on the end face of the shield, resulting in misalignment, cracking, damage and water leakage of the segment, reducing the compressive strength and impermeability pressure of the segment
But the existing cement-sodium silicate double liquid slurry, its concretion body has good long-term stability only under 95% high humidity, under the natural condition of the actual engineering site with humidity lower than 70%, its product (stone body) has a low stone rate and poor stability; it is prone to appearance cracking, disintegration and cracks, and the compressive strength is significantly attenuated
In conclusion, the existing cement-water glass double grout is used for synchronous grouting of shield tunnels, and its product (stone body) has poor stability, which will endanger the safety and waterproof performance of the segment lining structure, thereby limiting the cement-water glass double slurry. Application of Slurry in Synchronous Grouting of Shield TBM

Method used

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  • Product-stable cement-water glass double-liquid grouting material for shield synchronous grouting
  • Product-stable cement-water glass double-liquid grouting material for shield synchronous grouting
  • Product-stable cement-water glass double-liquid grouting material for shield synchronous grouting

Examples

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Effect test

Embodiment 1

[0020] A kind of embodiment of the present invention is, a kind of cement-sodium silicate two-liquid grouting material for synchronous grouting of shield machine with stable product, is made up of A liquid and B liquid, is characterized in that:

[0021] The components of the A liquid are cement, fly ash, retarder and water; wherein, the cement is 42.5 grade ordinary portland cement, the fly ash is grade II fly ash, and the retarder Ammonium dihydrogen phosphate with purity = 99.0%, pH value = 4.0, clarity = 3;

[0022] Described B liquid is the water glass that Baume degree is 30 °, and modulus is 3.1.

[0023] The weight ratio of each component of this example is: 252 parts of cement, 29 parts of fly ash, 1.9 parts of retarder, 675 parts of water; 319 parts of water glass.

[0024] In order to verify the product stability of the cement-sodium silicate double-liquid grout for shield synchronous grouting of the present invention, a corresponding comparative example without ad...

Embodiment 2

[0034] The component of this example is basically the same as that of Example 1, the difference is only:

[0035] The retarder is ammonium dihydrogen phosphate with purity = 99.5%, pH value = 4.5, clarity = 2.5;

[0036] Water glass with a Baume degree of 40° and a modulus of 3.3;

[0037] The weight ratio of each component is: 263 parts of cement, 66 parts of fly ash, 2.6 parts of retarder, 659 parts of water and 319 parts of water glass.

Embodiment 3

[0047]The components of this example are basically the same as Example one, the difference is only:

[0048] The retarder is ammonium dihydrogen phosphate with purity = 99.8%, pH value = 4.2, clarity = 2.0;

[0049] Water glass with a Baume degree of 35° and a modulus of 3.2;

[0050] The weight ratio of each component is: 278 parts of cement, 120 parts of fly ash, 2.8 parts of retarder, 636 parts of water and 319 parts of water glass.

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Abstract

The invention discloses a product-stable cement-water glass double-liquid grouting material for shield synchronous grouting, which is composed of a liquid A and a liquid B. The product-stable cement-water glass double-liquid grouting material is characterized in that the liquid A comprises the following components: cement, fly ash, a retarder and water, wherein the cement is 42.5-grade ordinary Portland cement, the fly ash is II-grade fly ash, and the retarder is ammonium dihydrogen phosphate with the purity of more than or equal to 99.0%, the pH value of 4.0-4.5 and the clarity of less than or equal to 3; and the liquid B is water glass with the baume degree of 30-40 degrees and the modulus of 3.1-3.3. The grouting material is used for shield synchronous grouting, the gelling time is short, and the anti-floating performance of pipe pieces is good; and a reaction product is good in stability, not prone to disintegration and cracking under the natural condition of actual engineering, small in volume shrinkage rate and free of degradation of compressive strength, and a formed segmental lining structure is high in strength and good in waterproof performance.

Description

technical field [0001] The invention relates to a grouting material for shield synchronous grouting. [0002] technical background [0003] During the excavation process of the shield tunnel, with the advancement of the shield machine, the segments spliced ​​at the shield tail of the shield machine will break away from the shield tail and enter the soil; since the outer diameter of the shield machine is larger than that of the segment ring Outer diameter, there will be a circular shield gap between the segments that are separated from the shield tail and the soil; it is necessary to continuously inject grout from the shield tail directly to the back of the wall during the advancement of the shield machine to fill the shield gap. The propulsion speed of the shield machine must match the grouting speed, and the grouting of one ring must be completed at the same time as one ring is advanced, so it is called synchronous grouting. The purpose of synchronous grouting of shield tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/08E21D9/06E21D11/10E21D11/08C04B111/70C04B111/34
CPCC04B18/08C04B28/26C04B40/0039C04B2111/343C04B2111/70E21D9/0607E21D11/08E21D11/10C04B7/02C04B22/002C04B22/16Y02W30/91
Inventor 任跃勤王士民林志宇聂华吴宗林杨峰张伯夷蹇蕴奇
Owner SOUTHWEST JIAOTONG UNIV
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