DD139362B1 - PLASTIC GASKET FOR PRESSURE WATER-RESISTANT SEALS - Google Patents

Description

Title of the invention

Plastic sealing membrane for pressure-water-retaining seals

Field of application of the invention

The invention relates to a plastic sealing strip for the sealing of buildings of all kinds against seepage and pressurized water.

Characteristic of the known technical solutions

Sealing sheets of thermoplastic materials are known without their own firmly connected to the train protective layers. Since the plastic gaskets are relatively thin and mechanically vulnerable, they must be embedded in protective layers. The use of rigid materials is known: foam sheets of polystyrene, bitumen or fleece of plastic fibers as a protective layer, but in each case must be applied separately from the geomembrane before and after installation of the web in separate operations (DE-AS 2,032,574). , These operations cause a considerable effort.

For example, in the case of mechanical installation by way of example, a protective layer of earth must be at least 30 cm thick, although for the protection of the geomembrane a substantially smaller thickness would suffice, so that a high transport and installation v / and arises.

Furthermore, the installation of fine-grained protective layers is always weather-dependent. These factors strongly influence the temporal construction process and the costs of sealing work · The laying of foam boards, bitumen board or nonwovens is considerably impeded by the wind. The protective layers must be secured against wind attack by suitable means until the final covering layer comprises e.g. Precast concrete is launched.

Thus, the individual operations are inconveniently dependent on each other in the construction progress, d. H. The laying of the protective layers can not be carried out in advance and independently of the laying of the film or cover layer. For vertical walls, the protective layers of foam or bitumen board must even be glued, which means additional effort. In addition, care must be taken to ensure that all materials used in direct contact are chemically compatible with each other.

PUr agricultural structures is the laying of Kunstetoffdichtungsbahnen sometimes without protective and cover layers usual, since the expenses for protective and outer layers appear too large. As a result, the duration of the function is considerably limited and the geomembranes must be renewed several times during the term of use.

Object of the invention

The aim of the invention is a geomembrane with improved properties in terms of the protection vor.mechanischen damage.

 "3 - Presentation of the essence of the invention

The invention has for its object to develop a geomembrane, which is completely provided with protective layers, wherein in the welded installation state by appropriate design of the edge zones a seamless protection of the plastic seal is guaranteed.

This object is achieved by a plastic waterproofing membrane for pressure water-containing seals, for sealing of structures of all kinds against seepage and pressurized water, thermoplastic materials and foamed protective layers, according to the invention a polyolefin plastic seal is coated on one or both sides with a polyolefin foam plastic protective layer and a solid Composite forms, in which optionally a mesh or lattice-like material is incorporated, wherein the edge strips are uncoated.

Advantageously, the polyolefin plastic seal from ethylene-vinyl acetate copolymer Beeteht with a vinyl acetate content of 2 to 25 wt .-%, of low density polyethylene or their mixtures.

The polyolefin foam plastic protective layer may consist of vinyl acetate-vinyl acetate copolymer having a vinyl acetate content of 2 to 14% by weight, of low-density polyethylene or of its coatings. Advantageously, the plastic seal has a thickness of 0.8 to 2.5 mm, preferably 1.1 to 2.0 mm. The thickness of the foam plastic protective layer may be 1.5 to 8.0 mm, preferably 3.0 to 5 mm, and the density 0.1 to 0.8 g / cm, preferably 0.2 to 0.4 g / cm.

With particular advantage, the surface of the foam plastic protective layer has a structuring. As a result, an improved adhesion of the underlying layers of soil is made possible and it can achieve more favorable embankment slopes.

For applications in which a particularly high mechanical tensile or compressive strength is required in addition to the sealing function, a mesh or lattice-like material is stored in the composite, such as glass fabric or polyamide mesh fabric. By using the plastic seal with foam plastic coating reduces the cost of producing a seal by eliminating the operations installation of the lower and upper protective layer. The final covering layer (for example anti-erosion layer in hydraulic engineering or bricklaying) can be applied directly to the foam-plastic-coated plastic seal, furthermore the greater absolute thickness of the sealing sheet results in a higher resistance to aging. Density and thickness of the foam plastic coating can be adapted to the stresses of the geomembrane. From the solid bond between the plastic seal and foam plastic protective layer constructive advantages arise, so, as is inevitable in the loose protective layers through the numerous gaps and cavities, no V / asser occur and thus can build no hydrostatic overpressure between plastic seal and Schaurakunststoffschutzschicht. The safety of the structure is thereby increased.

Next accounts for all compatibility problems, since Schaumkunstßtoffbe3chichtung and plastic seal made of the same plastic or compatible plastics. In agricultural storage pools or Guilebecken is now given by the firmly connected to the plastic seal foam plastic protective layer without installation of a final cover layer greater security for the plastic seal, which can expect significantly longer liutzungszeiten.

EXAMPLES Example 1

The plastic gasket is made by extrusion of an ethylene-vinyl acetate copolymer polymer having a vinyl acetate content of 8 to

14 wt -.% Obtained via a slot die. It has a thickness of 1.5 mm.

The foam plastic protective layer consists of a mixture ѵопбО GewS-iS low density polyethylene and 40 wt .-% ethylene-vinyl acetate copolymer having a vinyl acetate content of 2 bia 7 wt - . % And has a thickness of 4 mm and a density of 0.25 g / cm. The foam plastic protective layer is laminated onto the heat-resistant plastic gasket immediately after the bristle slot die. It is a solid composite formed. The cross section through the plastic sealing strip is shown in FIG. 1 means the plastic seal, 2 the foam plastic protective layer and 3 the uncoated edge strip.

This one-sided plastic foam coated plastic seal is placed on a 'relatively smooth base soil. An overlapping weld of the single webs on the uncoated edge strip creates a closed plastic sealing web. Then the necessary surface layers, such as gravel, gravel or concrete elements are applied directly.

Example 2

The plastic seal is a 1.1 mm thick ethylene-vinyl acetate copolymer film having a vinyl acetate content of 12 to 18 wt - . %, It is provided on both sides with a foam plastic protective layer of the composition of Example 1, wherein the upper Siiicht a thickness of 7 mm and a density of 0.15 g / cm and the lower layer has a thickness of 2 mm and a density of 0.5 g / cm. The composite is produced in accordance with Example 1. The cross section through the plastic sealing strip is shown in FIG. This plastic seal coated on both sides with foam plastic is laid on a coarse-grained surface. The single webs are united by lap welding the uncoated edge strips to a closed surface. Then the required cover layers of earth or rock are applied immediately.

Example 3

The plastic seal is a 2.5-min thick polyethylene film. The foam plastic protective layer has the composition according to Example 1 and a thickness of 3 "mm and a density of 0.35 g / crn ³ .

Between plastic seal and foam plastic protective layer, a glass mesh fabric is embedded. The preparation of the composite is carried out according to Example 1.

The cross section through the plastic sealing strip is shown in FIG. 1 means the plastic seal, 2 the foam plastic protective layer, 3 the uncoated edge strip and 4 the glass mesh fabric.

This reinforced plastic waterproofing membrane is used for unstable basic soil, where in the installed state by background changes mechanical tensile or compressive stresses act.

Example 4

The plastic seal is a 1.4 mm thick ethylene-vinyl acetate copolymer film having a vinyl acetate content of 2 to 8% by weight. The foam plastic protective layer has the composition according to Example 1 in a thickness of 5 mm and a density of 0, 25 g / cm. The preparation of the solid composite is carried out according to Example 1, wherein the surface of the foam plastic protective layer additionally has a structuring. The cross section through the plastic sealing strip is shown in FIG. 1 means the plastic seal, 2 the foam plastic protective layer, 3 the uncoated edge strip and 5 the structured surface of the foam plastic protective layer.

The plastic waterproofing membrane is laid on the base soil and then applied the outer layers. Due to the structured surface, the earth layers adhere very well, so that steeper embankment slopes are achieved, especially on embankments.

Documents contemplated: CH-PS 441 417

For this 1 page drawings

Claims (2)

LP 7844 Claim for invention 1 · plastic waterproofing membrane for druckvmsserhaltende seals, for sealing of buildings of all kinds against seepage and pressurized water, as a composite of thermoplastic material and foamed protective layer, characterized in that a plastic seal of ethylene-vinyl acetate copolymer having a vinyl acetate content of 2 to ' 5 wt -. ^c / o or mono- from low density polyethylene or on both sides by weight with a foam plastic protective layer of 60 wt .-% low density polyethylene and 40 Qe \ i .-% ethylene-vinyl acetate copolymer having a vinyl acetate content of 2-14 · - ^ and a density of 0.1 to 0.5 g / cnr coated, the edge strips are uncoated and in the composite optionally a mesh or grid-like material is embedded, 2 · plastic waterproofing membrane according to item 1, characterized in that the surface of the Schaumkunststoffschutzachicht has a structuring. For this Λ page drawings