Measuring and testing – With fluid pressure – Leakage
Patent
1992-11-18
1995-12-12
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 492, 405128, G01N 23204, E02B 316, G01M 304
Patent
active
054739357
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The invention relates to a method and a device for checking and repairing base and surface waterproofings of garbage dumps or the like.
2. Background of the Invention
These types of waterproofings are currently constructed like so-called combination seals consisting of one or more layers of a mineral material combined with plastic webs. The demands on their tightness are very high.
To detect any possible leaks, there is the method which has become known under the name "LEOS" according to which pipes permeable to gas are placed in the combination proofing layer. When there are partial leaks, gas enters a pipe. By moving the air column in the pipe, the area with the concentrated gas is also pushed out of the pipe, so that, at the end of the pipe, the position of the leak can be ascertained by calculating back. The method is unreliable in its measurement results because the pores of the pipe become easily clogged and mixtures can occur in the air column and with water. In surface waterproofings, the leaks can only be repaired by digging up the layers of earth on them. It is not possible to repair base waterproofings with this method.
Another method which has become known for detecting holes operates with electrically conductive coordinate grid systems in the plastic web. Repairs are also not possible in this case.
SUMMARY OF THE INVENTION
An object of the invention is to create a device and a method which do not have these disadvantages.
In accordance with an embodiment of the invention, a method for detecting leaks of waterproofing of garbage dumps and for repairing of the waterproofing in the case of leaks therein, wherein an operating pipe system with perforated pipes is located approximately in the center of the waterproofing, is comprised of the steps of (a) inserting an air tube 8 (see part 8 in FIG. 2) having an outside diameter corresponding to an inside diameter of one of the pipes into one of the pipe(s) 6 fare, the air tube having a first opening 14 on its circumferential wall and containing a suction tube 13 connected to the first opening, the air tube having at least a second opening 11 on its circumferential wall and containing a further tube 12 connected to the second opening, (b) inflating the air tube by compressed air to close perforations of the pipe except those which are in a region of the first and second openings, (c) applying suction to the suction tube to detect liquid in the region of the first and second openings, (d) in the event liquid is detected, pressing a sealing liquid through the further tube, the second opening, and perforations in the region of the first and second openings for penetration into the waterproofing, (e) releasing the compressed air from the air tube and moving the air tube a distance through the pipe in the direction of the opposite end of pipe, where such distance is of the order of the spacing between perforations on pipes of the operating pipe system, (f) repeating the steps (a)-(e) until the entire length of the pipe is checked, and (g) repeating the steps (a)-(f) on other pipes of the operating pipe system.
BRIEF INTRODUCTION TO THE DRAWINGS
Embodiments of the invention are explained in greater detail below with reference to the drawings, in which:
FIG. 1 is a cross-section through a garbage dump with a base waterproofing and furnished with the device of the invention.
FIG. 2 is an enlarged section from FIG. 1 that shows a basic embodiment for the device of the invention.
FIG. 3 is an enlarged section from FIG. 1 of the device of the invention.
DETAILED DESCRIPTION OF THE INVENTION
A base waterproofing or combination seal comprising of a mineral layer 2, plastic web 3, a gravel layer 4 with drainage pipes 5 in it is installed like a tub under the garbage dump 1. An operating pipe system with many pipe(s) 6 having openings or perforations 7 is placed below the plastic web 3. Air tube 8, which is wound up on cable rollers 9 on the right and left, is inserted into the operating pipe system 6. The air tube 8 is
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patent: 4753551 (1988-06-01), Brueggemann et al.
patent: 4846604 (1989-07-01), Holtmann
patent: 5155356 (1992-10-01), Peters et al.
Wiggins J. David
Williams Hezron E.
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