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Application of polyurea as drilled shaft underground excavating tunnel water-proof material

A waterproof material, polyurea technology, applied in tunnels, tunnel linings, shaft equipment and other directions, can solve the problem of not being able to ensure that it will not penetrate into the interior of the shaft, and achieve the effect of good anti-seepage and avoidance of leakage

Inactive Publication Date: 2009-04-15
SHANGHAI WEIKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is not possible to install an externally sealed waterproofing system for the tunnel
However, if paint or lining is used on the inner wall, there is no guarantee that there will be no leakage or that groundwater will not penetrate into the shaft.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An application of polyurea as a waterproof material for shaft underground excavation tunnels, the application specifically includes the following steps:

[0029] (1) Before installing geotextiles and joints, the surface of the tunnel needs to be cleaned with high-pressure water to remove floating dust and gravel. Other than that, no other form of surface preparation is required.

[0030] (2) Installation of geotextiles: Fix the geotextiles on the concrete surface through threaded expansion bolts. The length of the bolts depends on the size of the designed drainage joints and whether the surface of the substrate is undulating. Finally, it is necessary to obtain smoothness and consistency. The painted surface, and the bolt can penetrate to its specified depth.

[0031] When installing the geotextile, proceed from bottom to top along the inner wall, and there is an overlap of 100mm between adjacent rolls. The geotextile is evenly covered on the bolt, and the geotextile i...

Embodiment 2

[0037] An application of polyurea as a waterproof material for shaft underground excavation tunnels, the application specifically includes the following steps:

[0038] (1) Before installing geotextiles and joints, the surface of the tunnel needs to be cleaned with high-pressure water to remove floating dust and gravel. Other than that, no other form of surface preparation is required.

[0039] (2) Installation of geotextiles: Fix the geotextiles on the concrete surface through threaded expansion bolts. The length of the bolts depends on the size of the designed drainage joints and whether the surface of the substrate is undulating. Finally, it is necessary to obtain smoothness and consistency. The painted surface, and the bolt can penetrate to its specified depth.

[0040] When installing the geotextile, proceed from bottom to top along the inner wall, with an overlap of 300mm between adjacent rolls. The geotextile is evenly covered on the bolt, and the geotextile is gently...

Embodiment 3

[0046] An application of polyurea as a waterproof material for shaft underground excavation tunnels, the application specifically includes the following steps:

[0047] (1) Before installing geotextiles and joints, the surface of the tunnel needs to be cleaned with high-pressure water to remove floating dust and gravel. Other than that, no other form of surface preparation is required.

[0048] (2) Installation of geotextiles: Fix the geotextiles on the concrete surface through threaded expansion bolts. The length of the bolts depends on the size of the designed drainage joints and whether the surface of the substrate is undulating. Finally, it is necessary to obtain smoothness and consistency. painted surface, and the bolt penetrates to its specified depth.

[0049] When installing the geotextile, proceed from bottom to top along the inner wall, and there is a 500mm overlap between adjacent rolls. The geotextile is evenly covered on the bolt, and the geotextile is gently cu...

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PUM

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Abstract

The invention relates to an application which adopts polyurea as a waterproof material in concealed excavation tunnel of a vertical shaft. The application comprises the following steps: the polyurea is coated on a geotextile surface so as to obtain a seamless and integral polyurea geotextile compound which is used as a waterproof film and attached on the inner wall of the tunnel by a mechanical fixing mode so as to lead the permeated water to enter into a drainage system at the periphery of the tunnel. Compared with the prior art, the invention has the following advantages: (1) a structure which adopts polypropylene material to make woven fabric as base cloth and is coated with a polyurea layer is adopted and the whole protecting film is seamless and integral and has the characteristics of good permeability resistance, corrosion resistance, wear resistance and aging resistance and the like; (2) the waterproof film is attached on the inner wall of the tunnel in the mechanical fixing mode so as to lead the permeated water to enter into the drainage system at the periphery of the tunnel, thus avoiding leakage; and (3) the construction is simple, convenient and easy to implement.

Description

technical field [0001] The invention relates to tunnel waterproofing engineering, in particular to the application of polyurea as a waterproofing material for tunnels dug in shafts. Background technique [0002] In the construction of tunnel waterproofing, it is sometimes necessary to drill the shaft of the tunnel on site, and then use steel or concrete as a lining. In this case, it is not possible to install an externally sealed waterproofing system for the tunnel. And if use the way of coating or liner to inner wall, then can't guarantee completely leak-proof or groundwater can not seep into shaft inside. Contents of the invention [0003] The object of the present invention is to provide a polyurea with reasonable process, easy operation and good waterproof effect as the waterproof material for shaft underground excavation tunnels in order to overcome the above-mentioned defects in the prior art. [0004] The purpose of the present invention can be achieved through th...

Claims

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Application Information

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IPC IPC(8): E21D11/38
Inventor 邓庆仪董海普
Owner SHANGHAI WEIKAI CHEM
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