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Tunnel waterproofing construction and method

A technology for tunnels and drainage layers, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as danger, damage to the working environment, and uneconomical coating

Inactive Publication Date: 2006-10-18
WR GRACE & CO CONN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is a problem that this is an operation to be performed on a shelf at the roof of the tunnel, so it is dangerous, and there are restrictions on movement during the setting operation
In addition, there is also a problem that the coating surface is an uneven cavity surface, making it difficult to finish the coating after the first coat
[0007] However, there are also problems that wet surfaces cause poor adhesion and the film becomes uneven due to dripping after spraying
Also, the spraying is misty, which spoils the work environment, and the high price makes the coating uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] A U-shaped mock tunnel was fabricated with an opening of 4m, a height of 3.5m and a length of 3m. It is assumed that the tunnel mound surface is irregular in the simulated tunnel, and 15 concrete blocks having a width of 15 cm, a height of 20 cm, and a length of 20 cm are arranged at appropriate intervals to form the irregular surface.

[0034] The quick-drying stucco was sprayed as the first spray stucco and a "no-lap" adjustment of the irregular surface (ie, smoothing the sprayed irregular surface) was performed.

[0035] Immediately after spraying, mix A agent and B agent at the nozzle part and apply a two-component rubber emulsion that can be vulcanized at ambient temperature on the plaster surface with a jet sprayer (available from Grace Construction Products, U.S., The trade mark is PROCOR 75) reaches 2mm thick, and this double-dose rubber emulsion comprises A agent and B agent, and wherein the main component of A agent is styrene butadiene rubber, and B agent com...

example 2

[0047] A U-shaped mock tunnel was fabricated with an opening of 4m, a height of 3.5m and a length of 3m. It is assumed that the tunnel mound surface is irregular in the simulated tunnel, and 15 concrete blocks having a width of 15 cm, a height of 20 cm, and a length of 20 cm are arranged at appropriate intervals to form the irregular surface.

[0048] The quick-drying stucco was sprayed as the first coat of sprayed stucco and a "no-lap" adjustment of the irregular surface (ie, smoothing the sprayed irregular surface) was performed.

[0049] Immediately after spraying, a nonwoven fabric made of polyester fibers was fixed to the surface of the first spray plaster layer with rivets.

[0050] Mix the A agent and the B agent at the nozzle part place and apply the double-dose rubber emulsion (manufactured by U.S. Grace Construction Products, brand name PROCOR 75) that can be vulcanized on the plaster surface with a jet sprayer to reach 2mm thick, thereby form a thin film. One day ...

example 3

[0057] A U-shaped mock tunnel was fabricated with an opening of 4m, a height of 3.5m and a length of 3m. It is assumed that the tunnel mound surface is irregular in the simulated tunnel, and 15 concrete blocks having a width of 15 cm, a height of 20 cm, and a length of 20 cm are arranged at appropriate intervals to form the irregular surface.

[0058] Spray quick-drying stucco as the first coat of spray stucco and make "no-lap" adjustments for irregular surfaces. Immediately after the spraying, mix the A agent and the B agent at the nozzle part and apply an ambient temperature type double-component rubber emulsion (manufactured by Grace Construction Products in the United States, brand name PROCOR 75) on the plaster surface with a jet sprayer to reach a thickness of 2mm , forming a thin film. One day after spraying, a second coat of concrete was applied, 30 cm thick.

[0059] As a result, the following points can be found.

[0060] 1. Using spraying operation has good film ...

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Abstract

A tunnel waterproofing method, characterized in that the first concrete coating is sprayed onto the surface of the tunnel cavity, and the vulcanizable rubber emulsion is sprayed onto the surface of the first sprayed cement concrete layer at normal temperature to form A vulcanizable rubber membrane, and a second concrete coating is applied to the surface of the rubber membrane. The surface of the tunnel cavity may also be lined with a first sprayed cement concrete layer and a buffer water-conducting layer may be provided on the surface of the first sprayed cement concrete layer.

Description

field of invention [0001] The present invention relates to constructions and methods for tunnel waterproofing, and more particularly to the construction and use of vulcanized rubber membranes on tunnel waterproofing surfaces. Background of the invention [0002] In the present invention, slurry, mortar, and concrete are used as general terms representing cement concrete. [0003] The main tunnel construction method in Japan at present is the Neo-Austrian Tunneling Method (NATM method). In the NATM method, a first coat is applied by spraying plaster or concrete directly after tunnel excavation to prevent rock fall and water leakage in the excavated area. Afterwards, a second coat of concrete is applied in order to stabilize the tunnel by maintaining its strength. At this time, a waterproof sheet is provided for waterproofing and as an interlayer between the first concrete coat and the second concrete coat, so that water can be prevented from leaking into the tunnel, and adh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/38
CPCE21D11/105E21D11/383E21D11/38
Inventor 清水祥夫小菅启一
Owner WR GRACE & CO CONN
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