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Solidable grouting liquid for synchronous grouting of subway shielded construction

A synchronous grouting, subway shield technology, applied in the field of cement mortar slurry in the field of tunnel engineering technology, can solve the problems of loss of workability, no control effect, no anti-segregation and pumping lubrication characteristics, etc. The effect of high transmission capacity and high anti-segregation characteristics

Inactive Publication Date: 2007-06-06
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] A subway section tunnel construction, the tunnel is 1038m long, covered with soil 10.8 ~ 14.2m, in the gray muddy clay layer, the soil sensitivity of this layer is high, easy to settle after being disturbed. The tunnel is constructed in the form of FCB earth pressure balance shield synchronous grouting to prevent soil deformation.

[0015] The synchronous grouting of the original construction plan adopts the French formula inert grouting grouting, and the shield construction advances from the 879th ring, and the hardenable grout of the present invention is used for a total of 160 grouting rings, and the construction period is mid-June.

[0016] Requirements for materials and equipment:

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

[0018] 2. Slu...

Embodiment 2

[0025] The tunnel construction in a subway section, the tunnel is 873m long, and the covering soil thickness ranges from 8.535 to 16.378m. According to the survey data, the tunnel mainly passes through gray muddy clay and gray cohesive soil. , soft to plastic, high to medium compressibility soil. The shield tunneling area is located in a downtown commercial area with many high-rise buildings on the ground.

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

[0027] The initial setting value of the grout in winter will be delayed compared with the standard temperature. The grout formula selection: 15.0% cement, 40.0% fly ash, 20.0% sand, 24.0% water, 0.54% polyamine polymer and external admixture naphthale...

Embodiment 3

[0031] A tunnel in a subway section is constructed. The total length of the two lines of the tunnel is 2087m, and the thickness of the covering soil is about 83-15.6m. According to the survey data, the tunnel mainly passes through the first continental layer (river bed to floodplain sedimentary layer), the first sea Facies layer (neritic sedimentary layer), continental layer II (bed-floodplain sedimentary layer), continental layer III (riverbed-floodplain sedimentary layer) of Quaternary Upper Pleistocene, marine layer II (coastal ~ tidal zone facies sedimentary layer) and IV continental facies layer (riverbed ~ floodplain facies sedimentary layer). The soil quality above is mainly silt soil and sandy soil, with a water content of 20-30%, a liquid limit of 20-36%, and a relatively hard soil layer. There are high-rise buildings and cultural relics protection buildings on the ground of the shield pushing soil layer.

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

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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 synchronous 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, when this technology was used for synchronous grouting construction, single-liquid grout injection with inert grout was used. This grout is composed of bentonite, fly ash, sand, and water. The grout Large amount of bleeding, permanent non-consolidation, no compressive strength. In general, after the completion of shield tunneling construction joints, the second cement slurry injection is carried out to consolidate the slurry, which can better control the surface settlement within the allowable range. However, the settlement often exceeds the normal range (+1cm~-3cm), especially in the area under the building where the...

Claims

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Application Information

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