CA1238197A - Film material for the checkable leakproof separation of the regions situated on its two sides - Google Patents
Film material for the checkable leakproof separation of the regions situated on its two sidesInfo
- Publication number
- CA1238197A CA1238197A CA000489980A CA489980A CA1238197A CA 1238197 A CA1238197 A CA 1238197A CA 000489980 A CA000489980 A CA 000489980A CA 489980 A CA489980 A CA 489980A CA 1238197 A CA1238197 A CA 1238197A
- Authority
- CA
- Canada
- Prior art keywords
- spacer
- film
- passage
- substance
- film material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Abstract Flexible film material for the checkable leakproof separation of the regions situated on its two sides, for example a seepage barrier. In the intermediate cavity between two sealed films there is provided a planarly cohesive spacer which forms open flow cross-sections parallel to the film extension so that noxious substances entering at any point in the intermediate cavity can be drawn off at another point and thereby detected.
Description
I
FILM MATERIAL FOR THE CHECKABLE LEAKPROOF SEPARATION
OF THE REGIONS SITUATED ON ITS TWO SIDES
Description The invention relates to a flexible film material for the checkable leakproof separation of the regions on its two sides, for example to form a seepage barrier in the ground to protect the ground water from tonally present noxious substances.
The double-wall construction of such a barrier is known with a sand filling in the cavity provided with sampling tubes through which the presence of any noxious substances can be detected after they have got through a leak into a wall section and before they can also penetrate the other wall section into the ground water region to be protected ("ENVIROWALL" brochure published by Schlegel Lining Technology Inc.). However the treatment of a known double film of this type is difficult because two films have to be introduced into the channel ditches provided in the soil and the sand filling has also to be introduced between them.
The invention is based on the object of providing a film material of the type mentioned in the introduction which forms a double wall which can be treated as a unit.
Various aspects of the invention are as follows:
A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
first and second substantially completely spaced-apart sheets of material impermeable to the passage of said substance; and a spacer disposed between said first and second sheets, said spacer having an open flow cross-section in a direction parallel to the surface of the film.
A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
a first sheet of material impermeable to the passage of said substance;
pa 38~L~7 a second sheet of material impermeable to the passage of said substance; and means for maintaining said first and second sheets in substantially completely spaced-apart generally parallel relationship and for forming a plurality of mutually interconnected chambers between said sheets whereby a leak at one point in said film may be detected by the presence of the undesirable substance at a remote point.
By way of added explanation, the inventive achievement in one aspect consists in that the film material contains a plenarily cohesive spacer with open flow cross-sections in the direction parallel to the film extension in the cavity between two sealed films.
Preferably this spacer is formed from a planar material with protrusions rising transversely to its extension.
Conversely, it may also have indentations sunk transversely to its extension. The side edges of the protrusions or indentations must be so steep in relation to the principal extension direction of the planar material that the films cannot in any way completely make contact with the surface of the planar material situated in between or that the flow cross-sections formed by the protrusions or indentations can be closed.
The embodiment of the spacer as a grid containing at least two assemblages of essentially parallel webs whose crossover or connecting points have a greater thickness than the individual webs so that the said protrusions I' ~LZ3~97 are formed at the crossover or connection points while the sunken indentations are present in between, has proved particularly expedient. A typical example of a spacer of this type is a netting or weft or a grid constructed as a single piece with thickened connecting points as is preferably obtained through a perforated plastic film being stretched in both plane directions, the bridges located between two holes in each case being stretched and the central surface areas located between three or four adjacent holes as connecting points being less severely stretched and therefore thicker.
Finally, an open-pore planar material such as, for example, felt, an open-pore plastic film material or a porous granulated sistering product, is also suitable as a spacer.
The invention will be explained below in more detail with reference to the drawing which illustrates an advantageously exemplary embodiment. In these:
Figure 1 shows a section through the inventive film material;
figure 2 shows a view of the spacer;
Figure 3 shows a view of the film material from which the spacer as shown in Figure 2 is produced by stretching.
The film material consists of two covering films 1 and the spacer 2 which according to Figure 2 is formed from a grid of thin bridges 3 and connecting points or cross-over points 4 which are thicker than the bridges 3 and connect the latter. This spacer is produced by stretching a film of constant thickness, such as is shown in Figure 3 and which is provided with regular rows of holes 5, in the thermal plastic state in the two directions indicated by arrows. us follows self-evidently from a consideration of the size of the cross-sections stressed by the stretching stresses, the stresses in the region of the bridges 3' forming the narrowest cross-section are greater than in the region 4', so that the stretching principally involves the bridges, while the planar regions 4' located in each case between four holes 5 are not deformed or are only less deformed and therefore remain thicker as is seen in Figure 1.
It is possible to connect the covering films 1 permanently to the spacer 2, for example by wsldin~ at the thickened intersection points 4. However, this is not necessary in most cases because even laying the three components flat on top of each other makes them easy to manipulate jointly.
The covering films 1 consist, for example, of polythene in a thickness of preferably 1-5 mm. The maximum thickness ox the spacer 2, which expediently consists likewise of polythene, may be in the same order of thickness. Incidentally, a section of film for forming a seepage barrier in the soil made of the inventive material can be fashioned in the manner as is described and depicted in the not republished German Patent Application P 3 416 568 which pertains to the prior art. The covering films 1 are expediently joined on all sides by circumferential edge seam so that the cavity between them is closed in a leak-proof manner. This cavity may be tapped at an arbitrary point for testing the medium located therein. If, for example, the noxious substances to be monitored are volatile, it may suffice to provide at the upper edge of the film material embedded in the earth a vacuum connection through which samples of the atmosphere present in the intermediate cavity can be continuously or periodically extracted and examined. If samples have to be drawn off in the liquid state, an extraction hose can be led from an extraction point provided in the upper edge down into the lower region of the intermediate cavity in the material in order that samples of the liquid collecting there can be sucked out.
Finally, it is also possible to fill the intermediate cavity in the material with substances which absorb or destroy the ingressing noxious substances and thereby render them harmless in a manner such that they cannot migrate out of the material in the direction of the soil zone protected.
FILM MATERIAL FOR THE CHECKABLE LEAKPROOF SEPARATION
OF THE REGIONS SITUATED ON ITS TWO SIDES
Description The invention relates to a flexible film material for the checkable leakproof separation of the regions on its two sides, for example to form a seepage barrier in the ground to protect the ground water from tonally present noxious substances.
The double-wall construction of such a barrier is known with a sand filling in the cavity provided with sampling tubes through which the presence of any noxious substances can be detected after they have got through a leak into a wall section and before they can also penetrate the other wall section into the ground water region to be protected ("ENVIROWALL" brochure published by Schlegel Lining Technology Inc.). However the treatment of a known double film of this type is difficult because two films have to be introduced into the channel ditches provided in the soil and the sand filling has also to be introduced between them.
The invention is based on the object of providing a film material of the type mentioned in the introduction which forms a double wall which can be treated as a unit.
Various aspects of the invention are as follows:
A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
first and second substantially completely spaced-apart sheets of material impermeable to the passage of said substance; and a spacer disposed between said first and second sheets, said spacer having an open flow cross-section in a direction parallel to the surface of the film.
A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
a first sheet of material impermeable to the passage of said substance;
pa 38~L~7 a second sheet of material impermeable to the passage of said substance; and means for maintaining said first and second sheets in substantially completely spaced-apart generally parallel relationship and for forming a plurality of mutually interconnected chambers between said sheets whereby a leak at one point in said film may be detected by the presence of the undesirable substance at a remote point.
By way of added explanation, the inventive achievement in one aspect consists in that the film material contains a plenarily cohesive spacer with open flow cross-sections in the direction parallel to the film extension in the cavity between two sealed films.
Preferably this spacer is formed from a planar material with protrusions rising transversely to its extension.
Conversely, it may also have indentations sunk transversely to its extension. The side edges of the protrusions or indentations must be so steep in relation to the principal extension direction of the planar material that the films cannot in any way completely make contact with the surface of the planar material situated in between or that the flow cross-sections formed by the protrusions or indentations can be closed.
The embodiment of the spacer as a grid containing at least two assemblages of essentially parallel webs whose crossover or connecting points have a greater thickness than the individual webs so that the said protrusions I' ~LZ3~97 are formed at the crossover or connection points while the sunken indentations are present in between, has proved particularly expedient. A typical example of a spacer of this type is a netting or weft or a grid constructed as a single piece with thickened connecting points as is preferably obtained through a perforated plastic film being stretched in both plane directions, the bridges located between two holes in each case being stretched and the central surface areas located between three or four adjacent holes as connecting points being less severely stretched and therefore thicker.
Finally, an open-pore planar material such as, for example, felt, an open-pore plastic film material or a porous granulated sistering product, is also suitable as a spacer.
The invention will be explained below in more detail with reference to the drawing which illustrates an advantageously exemplary embodiment. In these:
Figure 1 shows a section through the inventive film material;
figure 2 shows a view of the spacer;
Figure 3 shows a view of the film material from which the spacer as shown in Figure 2 is produced by stretching.
The film material consists of two covering films 1 and the spacer 2 which according to Figure 2 is formed from a grid of thin bridges 3 and connecting points or cross-over points 4 which are thicker than the bridges 3 and connect the latter. This spacer is produced by stretching a film of constant thickness, such as is shown in Figure 3 and which is provided with regular rows of holes 5, in the thermal plastic state in the two directions indicated by arrows. us follows self-evidently from a consideration of the size of the cross-sections stressed by the stretching stresses, the stresses in the region of the bridges 3' forming the narrowest cross-section are greater than in the region 4', so that the stretching principally involves the bridges, while the planar regions 4' located in each case between four holes 5 are not deformed or are only less deformed and therefore remain thicker as is seen in Figure 1.
It is possible to connect the covering films 1 permanently to the spacer 2, for example by wsldin~ at the thickened intersection points 4. However, this is not necessary in most cases because even laying the three components flat on top of each other makes them easy to manipulate jointly.
The covering films 1 consist, for example, of polythene in a thickness of preferably 1-5 mm. The maximum thickness ox the spacer 2, which expediently consists likewise of polythene, may be in the same order of thickness. Incidentally, a section of film for forming a seepage barrier in the soil made of the inventive material can be fashioned in the manner as is described and depicted in the not republished German Patent Application P 3 416 568 which pertains to the prior art. The covering films 1 are expediently joined on all sides by circumferential edge seam so that the cavity between them is closed in a leak-proof manner. This cavity may be tapped at an arbitrary point for testing the medium located therein. If, for example, the noxious substances to be monitored are volatile, it may suffice to provide at the upper edge of the film material embedded in the earth a vacuum connection through which samples of the atmosphere present in the intermediate cavity can be continuously or periodically extracted and examined. If samples have to be drawn off in the liquid state, an extraction hose can be led from an extraction point provided in the upper edge down into the lower region of the intermediate cavity in the material in order that samples of the liquid collecting there can be sucked out.
Finally, it is also possible to fill the intermediate cavity in the material with substances which absorb or destroy the ingressing noxious substances and thereby render them harmless in a manner such that they cannot migrate out of the material in the direction of the soil zone protected.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
first and second substantially completely spaced-apart sheets of material impermeable to the passage of said substance; and a spacer disposed between said first and second sheets, said spacer having an open flow cross-section in a direction parallel to the surface of the film.
first and second substantially completely spaced-apart sheets of material impermeable to the passage of said substance; and a spacer disposed between said first and second sheets, said spacer having an open flow cross-section in a direction parallel to the surface of the film.
2. A multi-layer flexible film for forming a verifiable barrier against the passage of an undesirable substance comprising:
a first sheet of material impermeable to the passage of said substance;
a second sheet of material impermeable to the passage of said substance; and means for maintaining said first and second sheets in substantially completely spaced-apart generally parallel relationship and for forming a plurality of mutually interconnected chambers between said sheets whereby a leak at one point in said film may be detected by the presence of the undesirable substance at a remote point.
a first sheet of material impermeable to the passage of said substance;
a second sheet of material impermeable to the passage of said substance; and means for maintaining said first and second sheets in substantially completely spaced-apart generally parallel relationship and for forming a plurality of mutually interconnected chambers between said sheets whereby a leak at one point in said film may be detected by the presence of the undesirable substance at a remote point.
3. A film as claimed in claim 1, wherein the spacer is formed from a planar material with protrusions rising transversely out of the plane of the spacer.
4. A film material as claimed in claim 1, wherein the spacer is formed from a planar material with indentations sunk transversely to its extension.
5. A film material as claimed in claim 4, wherein the spacer contains perforations.
6. Film material as claimed in claim 3, wherein the spacer is a grid containing at least two intersecting assemblages of essentially parallel elongated strips of material, whose crossover or connecting intersecting points have a greater thickness than the individual strips.
7. Film material as claimed in claim 1, wherein the spacer is an open-pore film material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3432642.1 | 1984-09-05 | ||
| DE19843432642 DE3432642A1 (en) | 1984-09-05 | 1984-09-05 | FILM MATERIAL FOR CONTROLLABLE SEALING SEPARATE THE AREAS ON ITS BOTH SIDES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1238197A true CA1238197A (en) | 1988-06-21 |
Family
ID=6244711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000489980A Expired CA1238197A (en) | 1984-09-05 | 1985-09-04 | Film material for the checkable leakproof separation of the regions situated on its two sides |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0193605B2 (en) |
| JP (1) | JPS62500163A (en) |
| AU (1) | AU4951985A (en) |
| CA (1) | CA1238197A (en) |
| DE (2) | DE3432642A1 (en) |
| WO (1) | WO1986001554A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3607525A1 (en) * | 1986-03-07 | 1987-09-10 | Niederberg Chemie | BREAK DETECTOR ON A SLOT WALL |
| CA1303863C (en) * | 1986-06-23 | 1992-06-23 | Walter Van Woudenberg | Pressure barrier liner |
| DE3632951A1 (en) * | 1986-09-27 | 1988-03-31 | Dynamit Nobel Ag | FLEXIBLE SEALING COATING |
| DE3714743A1 (en) * | 1987-05-02 | 1988-11-17 | Holzmann Philipp Ag | Landfill site with a landfill base which can be monitored |
| DE3717586C2 (en) * | 1987-05-25 | 1996-04-04 | Huels Troisdorf | Landfill sealing |
| DE3720519A1 (en) * | 1987-06-20 | 1988-12-29 | Flachglas Ag | SEALING STRUCTURE FROM A VERTICAL SLOT WALL AND A SEALING WALL ARRANGED THEREOF |
| DE8902963U1 (en) * | 1989-03-10 | 1990-07-12 | Niederberg-Chemie GmbH, 4133 Neukirchen-Vluyn | Drainage mat |
| DE4038962A1 (en) * | 1990-12-06 | 1992-06-11 | Akzo Gmbh | USE OF A PROTECTIVE MAT FOR SEALING |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3310453A (en) * | 1960-12-05 | 1967-03-21 | Bjorksten Res Lab Inc | Tear resistant material |
| FR1577294A (en) * | 1968-02-02 | 1969-08-08 | ||
| DE2237707A1 (en) * | 1972-08-01 | 1974-02-07 | Bayer Ag | DRAINAGE ELEMENT FOR EARTH AND GROUND HYDRAULIC ENGINEERING |
| DE2545762A1 (en) * | 1975-10-13 | 1977-04-21 | Rosemeier Kg | Flexible hollow body made of plastic films - with cavity for drainage, heat insulation, or buffer layer in package |
| DE2546753A1 (en) * | 1975-10-18 | 1977-04-28 | Isogleitchemie Handels Gmbh | Slip foil for buildings and roads - comprising foil pair superimposed over intermediary thin pref. PTFE foil |
| US4170675A (en) * | 1977-05-02 | 1979-10-09 | Flexipane Limited | Reinforced flexible panels comprising plastic sheeting on opposed sides of a mesh layer and a metal foil layer in association with a plastic sheet layer |
-
1984
- 1984-09-05 DE DE19843432642 patent/DE3432642A1/en not_active Withdrawn
-
1985
- 1985-09-04 CA CA000489980A patent/CA1238197A/en not_active Expired
- 1985-09-05 EP EP85905061A patent/EP0193605B2/en not_active Expired - Lifetime
- 1985-09-05 JP JP60504535A patent/JPS62500163A/en active Pending
- 1985-09-05 WO PCT/EP1985/000449 patent/WO1986001554A1/en active IP Right Grant
- 1985-09-05 AU AU49519/85A patent/AU4951985A/en not_active Abandoned
- 1985-09-05 DE DE8585905061T patent/DE3566425D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0193605B2 (en) | 1991-10-23 |
| JPS62500163A (en) | 1987-01-22 |
| DE3432642A1 (en) | 1986-03-13 |
| EP0193605B1 (en) | 1988-11-23 |
| AU4951985A (en) | 1986-03-24 |
| DE3566425D1 (en) | 1988-12-29 |
| WO1986001554A1 (en) | 1986-03-13 |
| EP0193605A1 (en) | 1986-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |