Horizontal grouting and static breaking construction method for tunnel shield originating portal with high water pressure

A construction method and the technology of starting holes, which are applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of poor reinforcement effect at the end, high risk of opening doors and starting holes, etc., so as to save manpower and reduce construction costs. Cost, effect of no slurry loss

Inactive Publication Date: 2018-11-30
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing underwater railway tunnels, when the bottom of the tunnel at the end is a medium-coarse sand layer, due to the influence of confined water and tides, the design of the end will be reinforced by triple tube high-pressure rotary grouting. For reinforced concrete continuous beams with a thickness of 1m, the reinforcement effect at the end is poor, and the risk of door breaking and starting is relatively high. However, there is no method that can effectively judge the reinforcement blind spot and concrete breaking

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The present invention is realized through the following technical scheme, the construction method of horizontal grouting and static breaking of the starting portal of the high water pressure shield, according to the law of groundwater pressure and the size of the seepage system at different positions to determine the reinforcement blind area; drilling in the reinforcement blind area can be carried out Controlled cycle infiltration grouting, through compaction, infiltration, and splitting, multiple reinforcement blind areas are penetrated and intersected to form a network of grout veins; silent breaking agent is poured into the borehole and hydration reaction expands, making the concrete There are three processes of cracks, crack propagation, and crack expansion, and finally the concrete is broken in the expected direction.

[0046] It should be noted that through the above-mentioned improvements, the combination of groundwater pressure and injection of fresh water to fin...

Embodiment 2

[0049] This embodiment is further optimized on the basis of the above embodiments, specifically including the following steps:

[0050] Step S1: End reinforcement inspection; specifically include the following steps:

[0051] Step S11: Take the core vertically from the ground and inspect it;

[0052] The principle of coring: the cores are located on both sides of the tunnel and the ends of the two tunnel parts, the number of cores is not less than 6, and the depth is the reinforcement depth.

[0053] When taking coring, do a good job of core preservation and data statistics, and the pile formation rate is required to be above 95%, and the piles must be continuous;

[0054] The core crossing is selected for the compression test, and the minimum strength must be greater than the design value of 2MPa.

[0055] Step S12: Horizontal observation hole construction;

[0056] Construction time: According to the origin of the shield, generally 30-40 days after the opening of the hole...

Embodiment 3

[0064] This embodiment is further optimized on the basis of the above embodiments, and the step S2 specifically includes the following steps:

[0065] Step S21: No water pipe with a switch is installed in the horizontal observation hole, the water pipe is drilled in a plum blossom shape, and the water pipe is fixed on the continuous wall with expansive cement;

[0066] Step S22: Close all the water pipes, inject water, turn on the switch randomly after the water pressure is formed, and record the water pressure and water volume;

[0067] Step S23: Preliminarily judge the location of the water gushing area and the source of the water according to the records;

[0068] Step S24: Use the grouting machine to inject colored water into one of the horizontal observation holes, open the other horizontal observation holes, judge the scope of the reinforcement blind area according to the flow direction of the colored water, and finally close the other horizontal observation holes and fi...

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Abstract

The invention discloses a horizontal grouting and static breaking construction method for a tunnel shield originating portal with high water pressure. The construction method includes the steps that reinforced blind areas are determined according to the law of groundwater pressure and the size of permeability in different positions; controlled circulation permeation grouting is carried out by drilling holes in the reinforced blind areas, through compaction, permeation and splitting, so that net shaped slurry vein is formed between multiple reinforced blind areas in a communication mode; a soundless cracking agent is injected in drilling holes and hydration reaction is sent to expand to make concrete appear three processes of crack appearing, crack propagation and crack expansion, and finally, the concrete is broken in the expected direction. The horizontal grouting and static breaking construction method for the tunnel shield originating portal with the high water pressure has the beneficial effects that the construction cost is low, the reinforcement effect is good, and the construction safety, environmental protection and efficiency are effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of shield tunnel door demolition, in particular to a construction method for horizontal grouting and static demolition of a high water pressure shield tunnel portal. Background technique [0002] In the existing underwater railway tunnels, when the bottom of the tunnel at the end is a medium-coarse sand layer, due to the influence of confined water and tides, the design of the end will be reinforced by triple tube high-pressure rotary grouting. For reinforced concrete continuous beams with a thickness of 1m, the end reinforcement effect is poor, and the risk of door demolition and initiation is relatively high. However, there is no method that can effectively judge the reinforcement blind area and concrete demolition. Contents of the invention [0003] The purpose of the present invention is to provide a construction method of horizontal grouting and static breaking for the starting portal of a high water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D11/10
CPCE21D9/0642E21D9/0678E21D11/105
Inventor 苏春生何十美汤振亚梁朋刚张庆
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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