Enclosed mud for underground excavation tunnel ultra-deep hole grouting

A technology of ultra-deep hole and casing material, which is applied in the engineering field, can solve the problems of slurry entering and jamming in the sleeve valve tube, and achieve the effects of small shrinkage, high brittleness, solidification time and strength growth rate

Inactive Publication Date: 2015-07-22
深圳市永鑫建设集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a casing material for ultra-deep hole grouting of underground excavation tunnels, which can withstand high pressure during high-pressure grouting and can overcome the ingress of sleeve valve pipe caused by grouting during the grouting process. Slurry problems and stuck tubes caused by sleeve valve tube deformation

Method used

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  • Enclosed mud for underground excavation tunnel ultra-deep hole grouting
  • Enclosed mud for underground excavation tunnel ultra-deep hole grouting
  • Enclosed mud for underground excavation tunnel ultra-deep hole grouting

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other Embodiment approach

[0023] In other embodiments, the specific gravity of the slurry of casing material cement, bentonite, water and additives is 1.5, and the viscosity of the funnel is 24-26s, which can control the solidification time and strength growth rate of the casing material slurry within 2-5 days, Satisfy grouting conditions with optimal efficiency.

[0024] Preferably, the casing dosage = 1.3×π*R*H. Among them: R=drilling radius*2-sleeve valve tube radius*2, H=height of grouting section.

[0025] During specific implementation, after the casing material is poured into a hole, the drill pipe is lowered to the bottom of the hole, and the mixed casing material is injected into the grouting section in the hole through the drill pipe by a mud pump. Wherein: the slurry-stopping material is quick-setting cement slurry mixed with quick-setting agent, wherein: the quick-setting agent is water glass or calcium chloride, and the volume ratio of water and cement in the cement slurry is: 1:1.5.

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Abstract

The invention discloses enclosed mud for underground excavation tunnel ultra-deep hole grouting. The enclosed mud is used for bearing high pressure during underground excavation tunnel ultra-deep hole grouting so that it can be guaranteed that grouting slurry does not overflow during high-pressure grouting. The enclosed mud is mainly formed by mixing cement, bentonite, water and admixtures, wherein the volume ratio of the cement to the bentonite to the water to the admixtures is 1: m: n: 0.03, m ranges from 1.2 to 1.5, n ranges from 1.5 to 2, accordingly enclosed mud slurry can bear high pressure during high-pressure grouting, solidification time of the enclosed mud slurry is controlled within 2-5 days, and the strength increasing rate of the enclosed mud slurry is controlled to meet grouting conditions. The enclosed mud for underground excavation tunnel ultra-deep hole grouting bears high pressure during high-pressure grouting and can solve the problem that slurry enters a sleeve valve tube in the grouting process due to grout leaking and solve the problem that the sleeve valve tube is blocked due to deformation.

Description

technical field [0001] The invention relates to the field of engineering, in particular to a casing material for ultra-deep hole grouting in tunnels excavated in soft bottom layers, hard plastic clay layers and fully weathered strata in reclamation areas. Background technique [0002] The existing ultra-deep hole grouting method for underground excavation tunnels has the following technical problems: due to the existence of soft strata such as rock filling, sand, and silt in the reclamation area, there are backfill soil layers, full and strongly weathered mixed granite from the surface down. Gneiss, rich in groundwater, mainly pore water, partly bedrock fissure water, strong permeability, large water volume, underground weathered rock has the characteristics of easy disintegration when exposed to water. There are great technical difficulties and risks in the construction of underground excavation tunnels in such strata. Existing horizontal deep holes in tunnels or vertical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
CPCE21D9/001
Inventor 林学春刘建国陈康陈玉峰陈成武宫平刘良辰黄毓钊廖波
Owner 深圳市永鑫建设集团有限公司
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