Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1986-12-18
1988-06-28
Corbin, David H.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
405 54, 405267, 405129, E02B 316, B09B 500, B65G 500
Patent
active
047535512
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to sealing screens for waste dumps, e.g., garbage dumps and the like, consisting of protective impermeable layers.
Sealing screens for waste dumps that are to be newly formed are known in many forms. West German Patent Publication No. DE-OS 30 44 436 describes a sealing screen that is produced from water and ash, in particular ash from a power station. West German Patent Publication No. DE-AS 26 30 345 describes a process in which a plastic foil, which is embedded in finely ground bulk or loose material, is used as a sealing screen. Other sealing screens are also known, these being produced from natural materials, such as clay.
The requirements placed on new waste or garbage dumps are extremely strict. Thus, not only is the highest quality and safety demanded of the materials and construction processes used for sealing screens demanded; also demanded is a capability for a rapid, cost effective and realiable repairability that must be able to cope with unforeseeable damage inflicted upon the sealing screen. Unforeseeable damage to the sealing screen can result from chemical conversion processes in a material that has been dumped, as some of such processes last a number of years. Further, damage may be caused by physical forces involved when the waste material is actually being dumped.
The sealing screens in use up to now do not permit the rapid and localized determination of damage in the screens and the rapid, cost effective, and reliable repairing of the screens. The repair of prior art sealing screens is only possible by using expensive and time consuming construction measures.
SUMMARY OF THE INVENTION
It is the object of the present invention to overcome such disadvantages. According to the present invention, this object has been achieved by utilizing a sealing screen with the following construction:
(a) two sealing layers (1) and (2), that are installed at a predetermined distance from each other;
(b) a control filter layer (3) between the sealing layers (1), (2),
(c) an injection line system (4), that is installed in the control filter layer (3),
(d) a second system of lines (5) within the control filter layer, that initially serves to inspect the first seal layer (1) and during an injection into the control filter layer (3) serves as an air and water removal system;
(e) a grid-like division of the sealing screen into individual areas, which in each instance are partitioned off from the adjacent individual areas by means of sealing connections (11) perpendicular to the sealing layer (1) and (2) and are connected through an accessable inspection and collection shaft (6) or a walkable tunnel (7) to a water removal line (8),
(f) a drain layer (9) with a drainage line system to remove drainage water from material that has been dumped; and
(g) a covering layer (10) for protecting the drain layer (9) when the material to be dumped is incorporated.
The incorporation of two sealing layers (1) and (2) into the sealing screen increases security and protection in contrast to single-layer sealing screens. Any damage to the first sealing layer (1) can be detected in a timely fashion, since the drainage water that is present in the material that is dumped immediately penetrates the control filter layer (3) and moves through the piping system (5) to the collector pit (6) or the tunnel (7), which are inspected on a regular basis.
Damage to the sealing screen is caused by whatever source is localized and can be located because of the grating-like and partitioned division of the individual areas of the sealing layers (1) and (2). Injection of sealing material and thus the complete sealing of the control filter layer (3) in the damaged areas can take place very rapidly and accurately by means of the pipes of the injection system (4), which results in the integrity of the seal being quickly re-established.
The invention provides for a testing procedure before the dump is put into operation in order that damage to the sealing layers (1) and (2) can be detected
REFERENCES:
patent: 3436919 (1969-04-01), Shock et al.
patent: 4112690 (1978-09-01), Hosoya et al.
patent: 4335978 (1982-06-01), Mutch
patent: 4352601 (1982-10-01), Valiga et al.
patent: 4406403 (1983-09-01), Luebke
patent: 4439062 (1984-03-01), Kingsbury
patent: 4451173 (1984-05-01), Watson et al.
patent: 4464081 (1984-08-01), Hillier et al.
patent: 4474053 (1984-10-01), Butler
patent: 4543013 (1985-09-01), Wagner et al.
patent: 4632602 (1986-12-01), Hovnanian
International Search Report, completed May 16, 1986, by the European Patent Office.
Brueggemann Heinrich
Herzhauser Manfred
Kochendoerfer Gottfried
Krubasik Klaus
BASF - Aktiengesellschaft
Bilfinger & Berger Bauaktiengesellschaft
Corbin David H.
Ricci John A.
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