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Double-liquid grouting reinforcement method for loose shallow covering soil

A technology of double-liquid grouting and shallow covering soil, which is applied in the fields of soil protection, construction, and infrastructure engineering, and can solve problems such as secondary leakage, affecting the reinforcement effect of covering soil, large grouting volume and grouting pressure, etc.

Active Publication Date: 2019-11-15
SHANGHAI FOUND ENG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional grouting process has a large amount of grouting and grouting pressure, which is likely to cause soil disturbance during construction, which may lead to secondary leakage, and large flow grouting is not easy to fully fill the soil with grout, which affects the reinforcement effect of the covering soil

Method used

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  • Double-liquid grouting reinforcement method for loose shallow covering soil
  • Double-liquid grouting reinforcement method for loose shallow covering soil
  • Double-liquid grouting reinforcement method for loose shallow covering soil

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Embodiment Construction

[0015] Embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] A double-liquid grouting reinforcement method for loose shallow overlying soil, the steps of which are as follows:

[0017] (1) Use an electric drill equipped with a 37mm diameter drill bit D to form a hole, see figure 1 , the hole forming depth is controlled within the segment, and the hole can be stopped when it reaches the inner wall of the segment, and within 1m of the grouting hole B, use an electric drill to lay out 5-10 grout holes C according to the actual situation. The hole diameter is consistent with the grouting hole B, the hole forming depth is controlled within the segment, and the hole can be stopped when it reaches the inner wall of the segment;

[0018] (2) The grouting pipe A adopts a 25mm diameter white iron pipe, which is inserted into the grouting hole B to the bottom of the hole, see figure 2 , Grouting hole B is b...

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Abstract

The invention relates to a double-liquid grouting reinforcement method for loose shallow covering soil. The double-liquid grouting reinforcement method comprises the steps: firstly, a plurality of grouting holes are drilled in a segment through an electric drill provided with a drill bit with the diameter being 37 mm, a plurality of grout oozing-out holes are drilled and distributed in the peripheries of the grouting holes, and the hole forming depth is controlled within the segment; grouting pipes are sequentially inserted in the multiple grouting holes to the hole bottoms, and grouting holeopenings are blocked through quick-setting cement; a mixer is connected to the grouting pipes, then cement slurry is injected through a cement slurry screw pump, water glass is injected through a water glass screw pump, and the cement slurry and the water glass are mixed through the mixer at the upper ends of the grouting pipes; and during grouting, the single grouting hole adopts the steps of three-time grouting and two-time stopping, that is, the cement slurry pump is started firstly, then the water glass pump is started for grouting, after grout oozing out, the water glass pump is stopped,then the cement slurry pump is stopped, after 2 min, second-time grouting is conducted, after grout oozing out, grouting is stopped for the second time, after 2 min, third-time grouting is conducted,after grout oozing out, the grouting holes are replaced, then grouting is conducted, and finally a grouting column group is formed. The double-liquid grouting reinforcement method is suitable for reinforcing the loose shallow covering soil formed by leakage of a shield tunnel.

Description

technical field [0001] The invention relates to a reinforcement method for loose shallow covering soil, in particular to a reinforcement method suitable for loose shallow covering soil formed by seepage of a shield tunnel. Background technique [0002] Leakage occurred during the construction of a certain subway tunnel. Ballasting, support and polyurethane grouting were carried out after the dangerous situation occurred, and the leakage water sealing was completed. However, loose and shallow covering soil is accumulated in the tunnel, and there is still a small amount of seepage water. Before the covering soil in the tunnel is cleaned, in order to prevent risks, soil consolidation and reinforcement is required, and the covering soil depth is 0.6-2m. [0003] The conventional grouting process has a large amount of grouting and grouting pressure, which is likely to cause soil disturbance during construction, which may lead to secondary leakage, and large flow grouting is not e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D15/02
CPCE02D3/12E02D15/02E02D2250/003
Inventor 赵文亮李耀良汲亮代振宁吕有旭杜广清
Owner SHANGHAI FOUND ENG GRP
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