DE4231980C2 - Groundwater basin made of plastic geomembranes without solid construction - Google Patents

Description

The invention relates to a groundwater basin according to the preamble of claim 1.

When building traffic routes such as roads, bike paths, pedestrian walkways straight, railroad tracks of railways, S-Bahn, Stra ßenbahnen etc. as well as other areas such. B. Park It is often necessary for various reasons that Surface of these buildings below an existing ground to lay water level. This would then happen without the grasp further measures cause the driving or walking area surface of the rail or the track is constantly exposed to water would.

One way to solve the problem is to start with lowering the water table to below the level of the affected area.

This will be avoided on the part of the water management administrations Environmental protection reasons hardly approved. To anyway to maintain the original course of the traffic route, arises as a possibility of building a groundwater basin.

Groundwater tanks are well-known structures that are used in solid construction be created wisely. Building material for both the tub floor as well as steel for the side walls concrete that is produced as waterproof concrete or through additional measures on the surface such as coating coating or painting or the application of sealing cardboard is made waterproof. For side sealing can also masonry with low water and earth pressure through plastering as well as painting, coating or sealing cardboard becomes impermeable to water.

Are in connection with the massive construction mentioned above also plastic sealing sheets as a supplementary sealing measure known. They are applied outside as protection against urgent groundwater.  

They are also used as roof waterproofing.

Furthermore, they are used as an internal seal of liquid known tanks or basins.

Plastic seals are also without connection to one massive structure known as waterproofing material. Insbeson their artificial ponds are often covered with plastics dresses to prevent the contents of the pond from seeping away countries. At landfills, plastic seals bend you Penetration of the landfill leachate into the subsurface.

Furthermore, the use of plastic sealing sheets in the construction of groundwater wells, regardless of the above mentioned massive structures from the patent application DD 127 403 known. The waterproofing membrane is used as a barrier layer used, which is laid on a bedding layer. The However, the barrier layer is permeable to water. building side a cover layer is arranged, in addition to protecting the Geomembranes and protection against buoyancy also as Filter layer serves for the water passing through the barrier layer penetrates. This is then collected through drainage and dissipated.

In all cases, the plastic sealing membrane delivered at the factory and then installed.

The methods described above for making a Groundwater tanks in solid construction cause considerable Building-costs. In addition, the construction period extends over one longer period and is due to the concrete or Mau work strongly dependent on the weather.

If massive structures are dispensed with using Sealing membranes as a barrier layer, however, is the previous one State of the art according to patent application DD 127 403  Tightness of the tub is not given, so that it constantly penetrates water must be removed.

The object of the invention is to ex construction costs to reduce tremendously, shorten the construction time considerably and practically independent of the season his; but at the same time a waterproof construction to produce so that no total groundwater penetration melt and must be derived as in the patent application DD 127 403. The groundwater basin is thus a construct solid construction is completely equivalent.

The task is solved by a tub construction, at of both the bottom of the groundwater basin and the walls made of waterproof welded or glued plastic Sealing membranes exist. Solid components are no longer required.

It is largely horizontal surfaces when manufacturing smooth out the existing ground as far as possible. On this smoothed subsoil then becomes a protective layer applied, both from stone-free, sandy material, ground slag and the like, as well as from one Fleece, glass wool, foamed plastic, an additional Chen plastic sheet or similar material may exist. Appropriate protective measures are also applied to the upper side protection of the sealing skin. It is also com combinations possible.

For the production of inclined surfaces, especially the side walls, usually formed as an embankment are the same as for horizontal surfaces of the Groundwater basin. With a strong inclination, however, can the danger of slipping stone-free sand, ground slag or the like may not be used as protective material be turned. Through a corrugated or nubbed film The surface can, however, at least for the top Protective layer of the film can be counteracted.

With a sufficiently stable foundation, in particular rock or  strong cohesive soil can be the side walls of the bottom water tub strongly inclined, possibly also vertically out be formed. Cohesive soil is mechanically smooth ten, rock by tapping tips and edges and bear level with mortar or shotcrete. given if possible, sheet pile walls can be rammed as an auxiliary structure the. Stone-free sand, ground slag or similar Res material also divide here because of the strong inclination as a protective layer.

If the conditions are right, measures can be taken Protection of the film can be completely dispensed with. This applies if the surfaces on which the geomembranes are laid come, largely smoothed and stone-free or the backfill material is stone-free, so that a mechanical Damage to the sealing membrane is avoided.

In addition to the tightness, the safety against buoyancy is also increased guarantee. Because the tub skin is protected only Film, it is not rigid and cannot bend record moments. The tub must therefore pass through at every point guarantee the appropriate load the security against buoyancy to ensure that parts of the base of the tub or the embankments can also stand out from the ground.

Due to the film construction, the tub is ver malleable. In addition to the vertical or inclined formation of the Lateral walls can also be the sole of the tub below the driving surface, sidewalk surface, parking space etc. lies, easily with this rising or falling to the top half of the groundwater table. Furthermore, Nen also indentations or bulges of the tub, the z. B. by existing structures can be created without difficulty getting produced. The building then serves as an abutment for the slide.  

The sealing skin and the associated sealing fleece, Plastic protective sheets, sheets of glass wool, etc. are on the upper edges of the tub fixed. This can be optional by anchoring in a suspension trench, by ground sewing gel or other constructions happen.

For massive structures that are located in the area of the tub is attached by gluing, welding, to dowels and the like, depending on local conditions and for economy.

Claims (3)

1.Groundwater trough for the placement of traffic routes of all kinds, furthermore of parking lots and open spaces under the constant or temporary groundwater level, whereby the entire sealing surface of the trough consists of plastic components, without solid components, which are welded or glued to each other, thereby characterized in that the basic water tank consisting of the plastic sealing membrane is watertight. 2. groundwater basin according to claim 1, characterized in that the welded or glued plastic sheets of the Groundwater basin are protected on one or both sides against mechanical stress or damage from a Protective layer or several protective layers made of fleece or glass wool le or foamed plastics or other plastic tracks or stone-free fine sand or finely ground slag or comparable materials. 3. groundwater basin according to claim 1 or 2, characterized that security against buoyancy in every point of the Tub is present.