 Portable apparatus for holding objects |
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| Shot blasting apparatus |
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| Window unit for use in oven doors |
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| Quick-action bar clamp |
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| Collapsible three-stage golf cart |
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| Tire truck |
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Covering for waste depositories
| Details |
Inventors: Nussbaumer, Manfred; Glaser, Eberhard; Beitinger, Eberhard;
Assignee: Ed. Z.sup.3 blin Aktiengesellschaft (Stuttgart-Mohringen, DE)
Primary Examiner: Corbin; David H.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
A multilayer plate for use in covering waste depositories comprises at least one drainage layer and a filter stabilization layer, the drainage layer serving to facilitate or enable the removal of water seeping downwardly from the surface of the depository covering or gases rising from the depository body. The filter stabilization layer comprises a fabric web, while the drainage layer includes a plastic grid. The plate is prefabricated and is of sufficient flexibility to be wound upon a roll for transport to a depository site. In one form, the prefabricated plate also includes a synthetic resin barrier layer which, upon installation of the plate, blocks the passage of water from above and the passage of gases from below. |
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DETAILED DESCRIPTION As shown in FIG.
1, a sandwich plate 21.
1 is included in a covering for the surface of a depository body 10.
From top to bottom, the covering comprises: a layer of humus 1, root soil 2, sandwich plate 21.
1, a mineral seal 7, a drainage layer for degasification 8, and an equalization layer 9 over the depository body 10.
As illustrated schematically in FIGS.
1 and 7, trees 11, 11.
1 and 11.
2 may be rooted in soil layer 2.
As illustrated in FIG.
2, sandwich plate 21.
1 consists of a filter stabilization layer 3 such as a filter fabric, a drainage layer 4 having a permeable support structure formed exemplarily by a claw mat, and a barrier layer 5 preferably in the form of an impermeable plate with impressed humps 6 for anchoring the sandwich plate 21.
1 to the mineral barrier layer 7 underneath.
The three layers of the sandwich plate 21.
1 are firmly connected to each other via cementing or welding spots 12.
The leakage water which penetrates from the surface of the depository cover into the root soil is retained by the barrier layer 5 and removed in the drainage layer 4 thereabove.
The filter stabilization layer 3 prevents fine soil particles from penetrating into the drainage layer 4 and thereby ensures the permeability of the drainage layer.
The free cross section of the drainage layer 4 is kept open by the support structure in the form of a screen or a claw mat, against the pressure of the soil.
The thickness of the drainage layer in the unloaded state must be so great that, after the loading has taken place, sufficient free cross section area is still available for removing the surface leakage water.
The overall thickness of the sandwich plate 21.
1 is advantageously between 2 and 5 cm.
The materials of the sand are available plastics, particularly high-density polyethylene (HDPE).
The sandwich plate 21.
1 is so flexible that it can be shipped to a construction site wound on a roll and can be unwound there from the roll directly onto an installation area.
The relative compressibility of the support structure of the drainage layer enables a bonding of the root soil layer to the sandwich plate 21
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