DE20121554U1 - Hose system for the renovation of pressure pipelines - Google Patents

Description

Eifert, Bressei and Kotlegen

European Patent Attorneys · European Trade Mark Attorneys

Pie Eifert, Bressei and colleagues · Radict.estraße ->3- 12-.39 Berlin Dipl.-Ing. Udo Eifert Dipl.-Ing. Dr.-Ing. Burkhard Bressei Dipl.-Ing. Volker Zucker Dipl.-Ing. Günter Köckeritz

Radickestr. 48

12489 Berlin-Adlershof

Germany

Telephone ++49(0)30 - 670 00 60 Fax ++49(0)30 - 670 00 670

Internet: www.patentberlin.de e-mail: office@patentberlin.de

VAT number: DE 138 714 760 Tax number: 36/272/60882

PolyLine Kanalsanierung GmbH & Co. KG Blankenburger Straße 5 16341 Zepemick

18 September 2002

KT/pa

GM05.413.7DE

Hose system for the rehabilitation of pressure pipelines

Hose system for the rehabilitation of pressure pipelines Description

The invention relates to a hose system for the rehabilitation of pressure pipelines that are at risk of breaking or are damaged by corrosion. The system can preferably be used in processes for the rehabilitation of pressure pipelines, in particular for the rehabilitation of drinking water pipelines.

The AMEX 5000 process is representative of the state of the art. The process is based on the fact that after a thorough pipe cleaning, a high-quality and PE-coated polyester fabric hose is filled with adhesive and put into the pipe using the inversion process. The adhesive bonds the fabric hose to the pipe wall. The disadvantage of the process is that pipes at risk of breaking cannot be completely repaired because in the event of a break, the pressure forces of the media to be transported can tear the inner coating or the broken edges can tear the inner coating or the broken edges can damage the inner coating. Another process is the so-called compact pipe process. Here, after the pressure pipeline has been cleaned, a thick-walled, stable PE pipe is inserted. Due to the necessary tolerances (for carrying out the assembly) between the new PE pipe and the pressure pipeline to be repaired, as well as the necessary wall thickness of the installed PE pipe, the result is a significant reduction in cross-section for future media transport. Corresponding additional energy expenditure is then necessary for the transport of the media. DE 199 58 833 A1 describes a process in which a fabric hose coated with adhesive is pressed against an adhesive-coated inner pipe wall using air pressure.

DE 39 06 057 C2 describes a lining hose that can be used to renovate pipes. It consists of a

hardenable plastic. The hose is pressed against the inner surface of the pipe to be renovated using a pressure medium, which hardens the synthetic resin. The lining pipe has a specific structure with a barrier layer. A separate calibration hose is required to carry out the process, which must be introduced into the interior of the lining hose through an inversion pipe. DE 44 26 151 C2 also describes a hose for lining pipes. This hose consists of a flexible fiber hose that is soaked in a hardenable resin and can be inserted into a pipe together with a calibration hose, with the calibration hose being closed at one end and the hoses not forming a unit. The structure of the hose must have special layers so that the friction conditions between the calibration hose and the outer layer of the fiber hose are not adversely affected by escaping resin.

The object of the present invention is to present a system for the rehabilitation of pressure pipelines, in particular a hose, which improves the solutions known from the prior art, whereby the cross-section of the rehabilitated pipeline should not be significantly reduced.

According to the invention, the object is achieved by the features of claim 1. Advantageous developments of the invention are contained in the associated claims 2 to 9.

Accordingly, the system according to the invention comprises a fabric/knitted hose impregnated with 2-component epoxy resin and an elastic sleeve that acts as a support hose, and can be expanded from the inside by the elastic sleeve that can be put under pressure and pressed against the inner wall of the pipe to be renovated. The system is introduced into the cleaned pipe to be renovated using means known per se.

The wall thickness of the fabric-Z-knitted hose, whose original diameter before expansion was 0 to 25% smaller than the inside diameter of the pressure pipeline to be renovated, is dimensioned so that, in combination with the epoxy resin, it can fully and exclusively absorb the forces resulting from the operating and test pressure plus the necessary safety factors. The contact pressure to achieve the expansion is 0.2 to 6 bar and is kept almost constant over a period of 1 to 24 hours and a reaction temperature of 20 to 150 ^° C.

A carrier material impregnated with epoxy resin, preferably polyester needle felt, is used for the fabric/knitted hose, and PVC is preferably used for the elastic cover. The elastic cover is preferably reinforced to withstand the contact pressure.

After the reaction time has elapsed, the fabric/knitted hose has formed into a pipe within a pipe and is also connected to the inner wall of the pipe to be renovated. The elastic sleeve, which does not stick to the epoxy resin due to its material properties, is now pulled out of the pipe, completing the renovation process.

The advantages of the system according to the invention are that a new pipe can be produced in the pipe to be renovated with the help of the system, the outside diameter of which is the same as the inside diameter of the pipe to be renovated, whereby the pipe to be renovated is completely relieved of the forces from the operation of the pipe. The roughness of the inner wall of the new pipe is extremely low and corresponds to the surface of the elastic casing. The elastic casing is impermeable to both the pressure medium and the epoxy resin. This ensures that the pressing process achieves the desired results and, in addition, an almost uniform wall thickness of the new pipe is achieved, so that the force absorption is homogeneous over the entire length of the new pipe. Another advantage is

that the pipe can be bent and is suitable for repairing curved pipes without wrinkles.

The selection of the process conditions pressure, temperature and time depends on the achievable diameter, the ambient temperatures, the time available and the desired final strength.

It is also in keeping with the nature of the invention to equip the fabric/knitted hose with a hose-like reinforcement on the outside. This further increases the pressure resistance of the new pipe without significantly changing its wall thickness.

The invention will be explained below using an embodiment.

Fig. 1 folded impregnated material

Fig. 2 Filling

Fig. 3 Composition A

Fig. 4 Remove elastic cover

Fig. 5 Support element

Fig. 6 Composition B

At the start of work, the unsaturated fabric/knitted hose (1) (preferably a polyester needle felt) is in the elastic cover (2) that will later be used as a support hose. From this situation, the fabric/knitted hose (1) is subjected to a vacuum, i.e. evacuated. The material is then impregnated with a 2-component epoxy resin (3). This can be done mechanically in a so-called fulling system or similar, or manually using tools that can be used on the construction site.

and auxiliary materials. The result of this impregnation and rolling process must be a homogeneous material saturated with the 2-component epoxy resin (3).

The material prepared in this way (soaked fabric/knitted tube (1) and elastic cover (2)) is, after the soaking process, either:

1. inverted on site into the pipe section to be repaired using compressed air or water or mechanically inserted using a winch or similar pulling device or

2. if the material (impregnated fabric/knitted hose (1) and elastic cover (2)) was prepared at a location independent of the construction site, possibly cooled down to a temperature between 0 and 10 ⁰ C and then transported to the site and then introduced into the pipe section to be repaired as described under 1.

Preferably, the soaked fabric/knitted hose (1) and the elastic cover (2) are introduced using the inversion process with water. This procedure is therefore described in more detail below, but this does not exclude the alternative options described under 1.

In order to invert the soaked fabric/knitted tube (1) and the elastic cover (2) using water, the material (both the fabric/knitted tube (1) and the elastic cover (2) that is currently still on the outside) is folded outwards (Fig. 1). The length L can be between 0.5 and 8 m.

The material prepared in this way is positioned in front of the pipe opening (4) of the pipe section to be rehabilitated (at the starting point) with the aid of mechanical aids, as shown in Fig. 2. It does not matter whether the

The mouthpiece (5) of the fabric-AS-woven hose (1) positioned in this way is at this time perpendicular to the opening of the pipe to be renovated (6) or at another angle.

After positioning the soaked fabric Ajewerk hose (1) and the elastic cover (2), water or another liquid is dosed into the preformed space (7). It does not matter whether the medium is cold or warm.

As a result of the process, the soaked fabric/knitted hose and the elastic cover (2) are now inverted into the pipe section to be renovated. The elastic cover (2) that was previously on the outside moves from the outside to the inside and vice versa relative to the soaked fabric/knitted hose (1), i.e. the soaked fabric/knitted hose

The knitted hose (1) then lies directly on the surface of the pre-cleaned pipe (6).

After the inversion process has ended, the elastic sleeve (2) completely filled with the inversion medium (preferably water) is in the pipe to be renovated (6) (Fig. 3). The elastic sleeve (2) thus introduced with the inversion medium is now kept under pressure and the inversion medium is heated. This is carried out until the 2-component epoxy resin (3) has reached its desired final strength, i.e. the required heating time (usually 3 to 12 hours) and the required temperature (usually 50 to 80 ^° C) depend on the 2-component epoxy resin (3) used. It does not matter whether the heating cycle follows directly after the inversion process or whether the material introduced by means of the inversion process (soaked fabric/knitted hose (1) and elastic sleeve (2)) first remains in the pipe (6) for a certain time without the supply of heat energy.

After the heating process is completed, the material is cooled to ambient temperature. This can be done by sudden or gradual cooling.

After the inversion medium has reached a temperature < = 45°C again, the pressure can be released from the elastic shell (2).

The inversion medium is removed from the then rehabilitated pipe (6), as is the elastic casing (2). It does not matter whether the elastic casing (2) is pulled out of the rehabilitated pipe (6) using mechanical aids (winch or similar) (Fig. 4, variant 1) or is removed from the rehabilitated pipe (6) by means of a further inversion (Fig. 4, variant 2). After the free pipe passage in the rehabilitated pipe (6) has been restored in this way, a mechanical, known support element (9) is installed in the newly created pipe (8) at both the start and the destination point. The aim of this support element (9) is to provide additional security against the medium later transported under pressure in the pipe penetrating into the annular space (10) that may be present between the new pipe (8) and the pipe to be rehabilitated (6) (Fig. 5).

In order to increase the strength of the new pipe (8) under certain circumstances, it is also possible to insert an additional hose-like reinforcement into the pipe to be renovated (6) before the fabric/knitted hose (1) and the elastic sheath (2) are inverted together (Fig. 6).

The tubular reinforcement (11) preferably consists of a glass fibre material or a steel wire mesh.

&bull;&diams; ? : .· &idigr;

Claims (9)

1. Hose system for the rehabilitation of pressure pipelines, which can be applied to the inner walls of the pipelines to be renovated in a sealing manner, characterized in that the system comprises a fabric/knitted hose impregnated with 2-component epoxy resin and an elastic sleeve acting as a support hose, and can be expanded from its interior by the pressurizable elastic sleeve and pressed against the inner wall of the pipe to be renovated: 2. System according to claim 1, characterized in that the fabric/knitted hose is 0 to 25% smaller than the inner diameter of the pressure pipeline to be rehabilitated before the start of the pressing. 3. System according to at least one of the above claims, characterized in that the wall thickness of the fabric/knitted hose in combination with the 2-component epoxy resin can be dimensioned according to the forces to be absorbed from the operating and test pressure plus the necessary safety. 4. System according to at least one of the above claims, characterized in that the woven/knitted fabric tube consists of an impregnable carrier material, preferably polyester needle felt. 5. System according to at least one of the above claims, characterized in that the contact pressure is 0.2 to 6 bar and is kept almost constant over the duration of the reaction time of 1 to 24 hours at a reaction temperature of 20 to 150°C. 6. System according to at least one of the above claims, characterized in that the elastic sheath is removable after the reaction time has elapsed. 7. System according to at least one of the above claims, characterized in that the elastic cover preferably consists of PVC. 8. System according to at least one of the above claims, characterized in that the fabric/knitted fabric hose is provided on the outside with a hose-like reinforcement. 9. System according to at least one of the above claims, characterized in that it can be used in the drinking water sector.