DE8001619U1 - CORROSION-RESISTANT PLASTIC PIPE - Google Patents

Description

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Corrosion-resistant plastic pipe

The invention relates to a corrosion-resistant plastic pipe, which is particularly suitable for sewer pipes as Inliner in combination with a reinforced concrete or concrete pipe can be used as the outer jacket.

Concrete and reinforced concrete pipe for liquid lines and in particular for sewer pipes are not resistant to chemicals and can therefore not easily do without protective measures are used for such purposes and be used. Therefore, such concrete pipes have been provided with an inner, insulating coating for many years or provided with a corrosion-proof inliner, whereby the possibility must also be taken into account that durc the concrete pipe wall can penetrate groundwater. In earlier years, the inner pipe wall was often made with synthetic resins coated, but this has been abandoned for various reasons. For example, soft PVC film webs are also used or rigid PVC webs with T-anchoring are used. The use of the soft PVC film has the Disadvantage that it can be easily damaged, both during installation and also during operation of such Cables. Hard PVC linings do not offer adequate protection of the pipe joint in sewage pipes In addition, there is another disadvantage that several parallel webs form a pipe circle must be put together with appropriate joints. In addition, soft PVC and Harb-PVC are plastics whose abrasion resistance is relatively low, and as these materials are used as linings in sewers, carried by sand and other solids are exposed to high abrasion in the pipe sole area, they can be damaged relatively quickly will"

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It is also known as corrosion-resistant InÜneif for sewage pipes from concrete pipes Pöiyesterharzbetönröhre to use, which, however, essentially, i.e. * up to about 85 - 92% from mineral aggregates exist and only have a very low proportion of around 8 - 15% synthetic resin as a binder * This leads to in addition * that these inliners have a relatively high brittleness and thus low breaking strength, so that the Material tends to break and crack during transport and further processing, which prevents it from becoming underestimating failure results. The production of these known inliners is relatively expensive and requires corresponding machine equipment, whereby In addition, due to the centrifugal method of manufacture, only tubes with a circular cross-section can be generated, and also the dimensional accuracy of the inner cross-section because of the subsequent shrinkage Is subject to fluctuations. Another disadvantage is that these anti-corrosion pipes Polyester resin concrete sleeveless and without the possibility of a spigot formation for a rubber ring seal are manufactured. In addition, it has been shown that by the production in the centrifugal process and the low Binder content of synthetic resin essentially forms a rough surface on the inside, which are particularly suitable for smaller and medium-sized pipe diameters because of the associated small Adversely affecting flow velocity.

The invention is therefore based on the object of developing a corrosion-resistant plastic pipe, which does not have the disadvantages described and is easy to manufacture.

The solution to the problem is a corrosion-resistant one Plastic pipe Vörgesehiägen, which thereby cjekenfiäeiehfiet is that there is hardened synthetic resin on the inside of the tube with mineral additives in the core up to approx * 3 mm and an internal layer thickness of approx 2 - 5 mm and then and then forming the outside of the pipe from a mixture of hardened synthetic resin And | Glass fiber in a layer thickness of about 4-15 mm

The plastic pipe according to the invention is easy to manufacture, has excellent resistance to breakage and abrasion on, has significantly thinner wall thicknesses than with the previously known products and has in the rest of a completely smooth inner pipe surface, so that the flow rate and freedom from flow vortices of the liquid to be discharged is not impaired. The plastic pipe according to the invention can also be advantageous in any desired larger length * will be presented.

For the production of the plastic pipes according to the invention Polyester and epoxy resins are particularly suitable as plastics, the glass fiber is expediently in the form so-called rovings are used. The production of the plastic pipes takes place in which a steel core is used for the molding a corresponding tube, either completely smooth and mostly cylindrical in shape or else can be provided with socket end or spigot end, with the plastic binder, in particular polyester resins, is sprayed. The synthetic resin develops an adhesive effect, which is then followed by quartz sand in different grain sizes A known method is applied. As soon as the quartz sand layer is somewhat bound, the application begins of glass fibers * A bundle of so-called rovings is made of glass fibers through a plastic compound and then onto the rotating steel core, which is already the inner layer of plastic binder and Has quartz sand, wrapped. After the inliner has hardened, the steel core is then removed.

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When used as an inside for sewer pipes this wiifd Plastic pipe placed vertically and Outer boarded * Between the formwork and the outer one A steel reinforcement is attached to the wall of the inliner, which is then connected to it in a known manner Concrete is surrounded, with the concrete between the formwork and the outer wall of the inliner is poured. Then, after the concrete has compacted and set, the formwork is removed, and the finished sewer pipe can be used.

However, the plastic pipes according to the invention cannot only found as inliners for sewer pipes, but they are due to their breaking strength and chemical resistance also suitable without being used in conjunction with concrete or reinforced concrete. as well they can be used as pipes for fresh water or rainwater; they are also in the chemical Area can be used as line pipes if the liquid to be passed through is made of plastics is compatible.

The invention is explained in more detail below with reference to the drawings:

Figure 1 shows a cross section through a plastic pipe according to the invention.

FIG. 2 shows an enlarged section of the pipe wall with a relatively thin inner layer and a relatively thick outer layer.

Eigur 3 shows a longitudinal section of a finished composite pipe.

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Figure 4 shows a cross-compatibility through a "Rohif ent" speaking Figure 3.

Figure 5 shows a longitudinal section of another finished composite pipe *

FIG. 6 shows a corresponding cross section of the tube from FIG.

FIG. 7 shows a longitudinal section of another according to the invention Plastic pipe.

Figure 8 shows a corresponding cross section of the pipe from Figure 7 *

As can be seen from Figures 1 and 2, the plastic pipe according to the invention consists of a relatively thin inner layer of hardened plastic with mineral additives (1) and a relatively thick outer layer of hardened plastic and wound glass fibers (2), the ratio of inner layer to geek ~ hicht about 25: may be 75% * Figure 3 shows a longitudinal section of a feritgen composite tube, whereby according to the invention cylindrical corrosion protection tube (3) inside the tubular shank of the outer concrete pipe (^ ^y is the static shell and wherein the Muffentand Spitzendausbildung for articulated pipe seal are made in concrete. Figure 4 shows a cross-section through a pipe corresponding to Figure 3, wherein the inventive plastic pipe (3) is inside the ketone casing (4) and (7) represents the socket end a further embodiment, wherein- si ch likewise the plastic pipe (3) according to the invention is located inside the concrete pipe (4) serving as a static casing,

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wherein the plastic pipe (3) manufactured to be corrosion-proof Has socket (5) and spigot formation (6) for the articulated pipe seal. Figure 6 shows a cross section by an embodiment according to Figure 5, wherein the plastic pipe (3) is inside the concrete casing (4) is located. FIG. 7 shows a longitudinal section through a corrosion-proof plastic pipe according to the invention, in which the inner layer (1) is followed by the outer glass fiber reinforced layer (2) and that due to its wall thickness and the reinforcement with wound glass fiber strands for laying under the surface of the earth is suitable and in which the ends were designed as a socket (5) or spigot end (6) during manufacture, so that an articulated pipe connection by means of a rubber ring is possible. Figure 8 shows a cross section through a Embodiment according to Figure 7, with the Inner layer (1) the reinforced outer layer (2) follows and (5) represents the sleeve formation.

The drawings represent preferred embodiments of the subject matter of the invention. They also include those embodiments which are familiar and obvious to the person skilled in the art based on his knowledge.

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Claims (2)

rl utility model registration. *: '.'I I. I ·; ;: j25. March 1930 Ref .: G 80 01 619.9 "" * "" GM 1/80 Note: Erich Kiesling S chutz an Sprüche 1. Corrosion-resistant plastic pipe, characterized in that it is made of hardened synthetic resin on the inside of the pipe mineral aggregates in the core size up to approx. 3 min and in a layer thickness of approx. 2-5 mm and then and the itöhrausenseite forming from a mixture of hardened synthetic resin and Consists of glass fibers with a layer thickness of 4-15 mm. 2. Plastic pipe according to claim 1, characterized in that the Ends are designed as a sleeve or spigot for attaching a flexible rubber seal. • · · # Il 4 «I # I I f Il III Il