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Solidable grouting liquid for synchronous grouting of subway shielded construction

A technology of synchronous grouting and subway shielding, which is applied in the field of cement mortar slurry in the field of tunnel engineering technology, can solve the problems of loss of workability without any control function, no resistance to segregation and pumping lubrication characteristics, etc., to improve pump performance. The effect of high delivery capacity and high resistance to segregation

Inactive Publication Date: 2005-07-27
SHANGHAI TUNNEL ENGINEERING CO. LTD.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After retrieving the prior art literature, it is found that the U.S. patent application number is: US5707443. The patent application reads: materials such as cement, dispersant, expansion agent and consolidation agent. It can be seen from the above expression that the dispersant and expansion agent are added. , it can promote the uniformity of the freshly mixed slurry and the expansion of the stone body, but it has no anti-segregation and pumping lubrication characteristics, and has no effect on the loss of workability of the slurry mixed with a certain amount of Portland cement during the pumping process. control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] During the construction of a subway section tunnel, the tunnel is 1038m long and covered with soil between 10.8 and 14.2m. It is located in a layer of gray silt clay, which has high sensitivity and is easy to settle after being disturbed. The tunnel adopts FCB earth pressure balance shield synchronous grouting construction to prevent soil deformation.

[0015] The original construction plan used the French formula inert slurry grouting for synchronous grouting, and the shield construction was advanced from the 879th ring. Using the hardenable slurry of the present invention, a total of 160 rings were grouted. The construction period was mid-June.

[0016] Requirements for materials and equipment:

[0017] 1. The mixing blades of the mixing bucket, slurry truck and storage tank are widened, and the distance between the blades in the mixing bucket and the wall of the bucket is reduced, so that the distance between the mixing blade and the wall of the bucket is ≤10mm;

[0018]...

Embodiment 2

[0025] Construction of a subway section tunnel. The length of the tunnel is 873m, and the thickness of the overburden varies from 8.535 to 16.378m. According to the survey data, the tunnel mainly passes through gray silty clay and gray cohesive soil. , Soft to plastic, high to medium compressibility. The shield driving area is located in a commercial downtown area with many high-rise buildings on the ground.

[0026] In the original construction plan, synchronous grouting adopts French formula inert slurry grouting, and the shield construction is advanced from the 324th ring. The hardenable slurry of the present invention is adopted until the synchronous grouting is completed. The construction period is mid-December.

[0027] The initial setting value of the slurry in winter will be delayed compared to the standard temperature. The slurry formulation selection: cement 15.0%, fly ash 40.0%, sand 20.0%, water 24.0%, polyamine polymer 0.54% and admixture naphthalene series condensati...

Embodiment 3

[0031] During the construction of a subway section tunnel, the double line of the tunnel has a total length of 2087m, and the thickness of the overburden varies from 8.3 to 15.6m. According to the survey data, the tunnel mainly passes through the first continental layer (riverbed to floodplain sedimentary layer) and the first sea Facies layer (shallow marine sedimentary layer), II terrestrial layer (riverbed to floodplain sedimentary layer), Quaternary Upper Pleistocene III terrestrial layer (riverbed to river floodplain sedimentary layer), II marine layer (coastal ~Tidal zone facies sedimentary layer) and the IV terrestrial layer (river bed~river floodplain facies sedimentary layer). The above soil is mainly silt and sandy soil, with a water content of 20-30%, a liquid limit of 20-36%, and a hard soil layer. There are high-rise buildings and cultural relics protection buildings on the ground.

[0032] The construction plan of this section all adopts the hardenable slurry of the p...

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Abstract

A subway shielding constructing synchronous slip casting hardening size consists of cement 7-15%, fly-ash 40-54%, sand 15-27%, water 22-25%, polyamine high-molecular polymer 0.54-0.63%, and external adulterant condensation compound 0.37-0.46%. The value of size consistence is (cm)9.5-11.5, bleeding rate(%) <=6.0, it reaches original soil strength when size fecundity age period 1-2 days, and it reaches 5-9Mpa when age period 28 days. Its advantages include good water-retaining property and lubrication, and higher pump delivering ability.

Description

Technical field [0001] The invention relates to a cement mortar slurry in the technical field of tunnel engineering, in particular to a hardenable slurry for simultaneous grouting in subway shield construction. technical background [0002] At present, the earth pressure balance shield construction technology is usually used in subway construction. In the past, this technology used inert grout for single-fluid pressure injection during simultaneous grouting. This grout is composed of bentonite, fly ash, sand, and water. Bleeding volume is large, permanent non-consolidation, and no compressive strength. Under normal circumstances, the secondary cement slurry injection is carried out after the completion of the shield construction joints to consolidate the slurry, which can better control the ground settlement within the allowable range. However, the settlement is often beyond the normal range (+1cm~-3cm), especially in the area under the building that the shield passes through. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/06C04B18/08C04B24/28
CPCY02W30/91
Inventor 谢彬傅德明张冠军
Owner SHANGHAI TUNNEL ENGINEERING CO. LTD.
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