Grouting slurry for reinforcing tunnel face of jacking culvert of fine-sand layer and grouting method

A technology of face and fine sand layer, which is applied in the field of grouting grout, can solve the problems of unsatisfactory grouting method, poor penetration of grouting materials, and small penetration range, so as to achieve convenient construction, easy excavation, and good effect Good results

Active Publication Date: 2016-07-06
中铁四院集团工程建设有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of poor penetration of the grouting material, small penetration range, high price, environmental pollution, and unsatisfactory effect of the grouting method existing in the reinforcement process of the existing fine sand layer jacking culvert face

Method used

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  • Grouting slurry for reinforcing tunnel face of jacking culvert of fine-sand layer and grouting method
  • Grouting slurry for reinforcing tunnel face of jacking culvert of fine-sand layer and grouting method
  • Grouting slurry for reinforcing tunnel face of jacking culvert of fine-sand layer and grouting method

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Embodiment 1

[0029] This example provides a grouting slurry for reinforcing the face of a jacking culvert in a fine sand layer, including component A and component B. The component A has a modulus of 2.5 to 3.0 and a Baume degree of 20 °Bé~25°Bé, the density is 1.16g / cm 3 ~1.26g / cm 3 water glass; the B component is a calcium chloride solution formed by anhydrous calcium chloride and water with a mass concentration of 25% to 30%; the volume ratio of the A component to the B component is 1:0.8~ 1:1.2.

[0030] The modulus of component A is selected from a modulus of 2.5 to 3.0, and within this range the water glass SiO 2 The content of water glass is high, the gel time is short, and the strength of the serous stone body is high; the Baume degree is 20°Bé~25°Bé, the water glass with this concentration has good fluidity, and can reach the largest diffusion range in the dense powder and fine sand layer. And it can meet the highest calculus body strength after reacting with B component. Comp...

Embodiment 2

[0042] A subgrade project under the existing Beijing-Kowloon Railway in Nanchang is designed with a large-span jacking cast-in-place frame culvert. The frame culvert is located 10m below the ground. The vertical and horizontal beam lifting scheme is limited by the span here, and a new type of pipe curtain is adopted. During the frame culvert jacking process, the slope ratio of the tunnel surface should be kept at 1:0.55 according to the jacking process requirements, and the stratum here is a uniform medium-dense sand layer with a standard penetration number of 15. ~19 strokes. After calculation, without reinforcement measures, the maximum slope ratio is 1:1. To achieve a slope ratio of 1:0.55, grouting measures must be adopted to make it meet the stability requirements. In view of this, this project The grouting method of the grouting grout used for the reinforcement of the face of the culvert face of the fine sand layer jacking provided by the present invention is adopted for ...

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Abstract

The invention provides grouting slurry for reinforcing the tunnel face of a jacking culvert of a fine-sand layer and a grouting method. When the jacking frame culvert is reinforced by a pipe curtain and the tunnel face needs to keep self-stabilization at certain slope ratio, the diluted water glass and prepared calcium chloride solution are sequentially adopted for horizontal grouting reinforcement by a modified perforated-pipe grouting technology; and the unconfined compressive strength of the reinforced soil body can reach 100-500kPa, and the slope ratio required by the blade feet of the jacking culvert can be realized. Compared with the reinforcement by chemical slurry and high-pressure jet grouting, the grouting method is safe and stable; compared with the reinforcement by superfine cement grouting, the spreading range is large, the strength after reinforcement can meet the requirement on slope ratio stability, the excavation is easy, the construction is convenient, and the construction cost is reduced by more than half; meanwhile, by adopting the grouting technology provided by the invention, sectional grouting can be realized, the pipeline is not blocked easily, and an aim of dominant permeation of slurry in the dense fine-sand layer is achieved; and a slurry plug is not arranged at the lower end but the upper part, the grouting range is expanded, and the grouting effect is relatively good.

Description

technical field [0001] The invention belongs to the technical field of soil grouting engineering, and in particular relates to a grouting slurry and a grouting method for reinforcing the face of a fine sand layer jacking culvert. Background technique [0002] With the rapid development of my country's infrastructure, more and more underpass railway projects have appeared, and the span of underpass and jacking culverts has become larger and larger. The method of protecting the stability of railway lines has shifted from conventional vertical and horizontal beam lifting methods to pipe curtains, etc. New reinforcement technology, but for the pipe curtain located in the fine sand layer with poor self-stabilization ability, it is necessary to take measures such as grouting reinforcement to solidify the sand layer to make it have a certain strength to ensure the self-stabilization of the sand layer during jacking, but at the same time the strength It should not be too high. On the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26E21D11/10C04B22/12
CPCC04B28/26C04B2111/00724E21D11/10E21D11/105C04B22/124
Inventor 陈仕奇孟长江陈占邬强赵海粟李丹彭志鹏
Owner 中铁四院集团工程建设有限责任公司
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