DE1039321B - Concrete pipe with corrosion-resistant inner lining - Google Patents

Description

GERMAN

The invention relates to a concrete pipe or the like with a corrosion-resistant inner lining. For improvement the resistance of concrete pipes to aggressive media, you already have the pipes with a provided inner or outer lining made of rubber 5 or plastic. Because of the different Expansion coefficient between concrete and the materials in question for the lining but there were great difficulties. Due to the peeling of the anti-corrosion layer as a result of the formation of bubbles at the contact surfaces between concrete and lining is common the anti-corrosion effect is illusory. The use of bituminous materials or the like as a lining, which would have a good bond with concrete, are due to the tendency to absorb water and the fragility under shock and impact loads, but above all because of the lack of them There are limits to the aging resistance and stability of these lining materials.

It has already become known in pipes made of asbestos-cement or concrete protective layers made of plastic or to throw in bitumen. However, these were exclusively homogeneous layers made of one single substance.

In contrast, the invention proposes to throw a corrosion-resistant inner protective layer into concrete pipes, wherein the anti-corrosion layer consists of components of different weights and different physical and mechanical properties is composed.

In the case of pipes made of spun concrete, the corrosion protection layer can be removed after the concrete pipe has been spun in the iron form and thrown in after the concrete pipe has set and the lime has been washed out the concrete pipe remains in its iron centrifugal shape. By adding Polyvinyl acetate binding agent for concrete can significantly accelerate the setting process.

As the corrosion protection layer is thrown into the concrete pipe, a certain pre-tension is created achieved, which is not degraded even after hardening of the lining layer and a solid Causes adhesion between concrete and protective layer.

The drawing shows an embodiment of a concrete pipe according to the invention. According to the invention, the corrosion protection layer should generally consist of two components α and b , of which the component α ζ. B. consists of bituminous or similar cheap materials and makes up by far the largest part of the protective layer.

These substances are made by mixing with other suitable substances so that they have a greater specific weight than component b, the concrete pipe
with corrosion-resistant inner lining

Applicant:

Josef Schmidbauer,
Munich 27, Buschingstr. 43

Josef Schmidbauer, Munich,

has been named as the inventor

The co-inventor has requested not to be named

z. B. made of a plastic such as polyethylene, polyvinyl chloride or another plastic resistant to the respective aggressiveness of the medium to be conducted. The coefficient of thermal expansion of the substances »should be between the coefficient of the concrete pipe c and that of the plastic b . With regard to the coefficient of expansion, the layer α then forms a kind of bridge between the concrete pipe c and the plastic layer b. When the corrosion protection compound is thrown into the concrete pipe c , the heavier substance, i.e. the component α of the corrosion protection layer, comes into contact with the inner wall of the concrete pipe as a result of the centrifugal force , while the plastic layer & will be deposited essentially on the inner wall of the composite pipe, i.e. in direct contact with the flowing medium. The process can be repeated if necessary to give multiple layers.

The advantages of this procedure are obvious:

1. You can use a spun concrete pipe with an inner lining without dismantling the spun concrete pipe obtain.

2. The penetration of the layer a into the pores of the concrete c and the pre-tensioning achieved during centrifugation ensure good adhesion.

3. c By appropriate tuning of the materials and their coefficients of expansion between the concrete, α plastic intermediate layer and b can ^occur: temperature fluctuations exert any harmful effects on the composite pipe.

4. The more expensive corrosion-resistant layer δ forms the smaller part of the lining, which makes the composite pipe much cheaper results.

809 638/237

5. The high-quality, corrosion-resistant layer lies almost exclusively on the inner wall of the composite pipe and thus forms an excellent one Protection against aggressive flow media.

6. As a result of the significantly reduced coefficient of friction with the flow medium compared to concrete coming in contact plastic layer and results as a result of the lower adhesion pump output is around 40% lower than with unlined concrete pipes and thus an essential energy gain.

Claims (2)

Pa TENT CLAIM: 1. Concrete pipe with corrosion-resistant inner lining, characterized in that in the particular produced by the centrifugal process placed concrete pipe with or without reinforcement a corrosion protection layer is thrown in, which from components of different weights and different physical and mechanical properties consists. 2. Concrete pipe according to claim 1, characterized in that the corrosion protective layer of bituminous od. Like. Materials with the addition of plastics, wherein the intermediate layer (a) due to their greater specific weight in Einschleudern substantially directly to the concrete wall (c) applies, while the lighter plastics (b) are on the inner wall of the composite pipe. Considered publications:
German Patent No. 819 188;
British Patent No. 521 902. 1 sheet of drawings © 809 638/237 9.