EP2890922A1

EP2890922A1 - Method and device for repairing sewage canals

Info

Publication number: EP2890922A1
Application number: EP13756382.1A
Authority: EP
Inventors: Alfred F. HRADIL
Original assignee: Hradil Spezialkabel GmbH
Current assignee: Hradil Spezialkabel GmbH
Priority date: 2012-08-29
Filing date: 2013-08-26
Publication date: 2015-07-08
Also published as: DE102012107989A1; WO2014033078A1

Abstract

The invention relates to a method and device for renovating sewage canals by means of a resin-soaked, hose-like liner (1) made of fibre composite material, which is pressed against the internal wall surface of the sewage canal using heated compressed air and is allowed to cure thereon. During renovation works, the methods thus achieves the advantage that the liner (1) temporarily pre-reacts due to heated air.

Description

- 1 -

Method and device for repairing sewers

The invention relates to a method for rehabilitating sewers by means of a resin-impregnated tubular fiber-reinforced fiber liner, which is forced by means of compressed air to the Innenwandfiäche the sewer and cured at this mitteis heated air or hot air for curing, and to a device for implementation of the procedure.

Such a method is given in WO 92/01552 A1. In this case, a hose-like body, a so-called ski liner, which is produced from a mat-shaped fiber composite material and impregnated with a hardenable resin, is introduced into a channel to be repaired, pressed against its inner wall surface and cured there. In this case, a polyester resin is used for impregnating the fiber or fabric mats, which hardens while supplying energy. After the tube has been inflated in the channel, the temperature is raised to 40-45 ° C to liquefy the resin and pour down resin. increased pressure to push up again and then harden by further increase in temperature of the air to about 80 ° C. These measures are energy and labor intensive, with a uniform resin distribution and curing are difficult.

Similar procedures for the internal sliding of pipes or repair of sewers are shown in WO 2004/046606 A1, DE 42 15 926 A and DE 0 2010 024 902 A1. EP 0 712 352 B2 discloses a method for producing a tubular lining hose in which an outer film tube is applied by tubular wrapping to a second film strip on a sliver shaped into a tube. In other current market practice, the hose liners are drawn into a sewer and easily installed with compressed air. A robot travels inside the tube liner and carries UV lamps whose radiation hardens the polyester resin. Since the resin is liquid, the tube is packed inside and outside in a foil. Hose liners are z. B. 80 meters long and have a wall thickness of z. B. 6 mm. The Hersteiiverfahren is expensive. In the usual curing by means of UV radiation, no epoxy resin can be used, since this can not be cured by means of UV radiation. In this way, sewer pipes with diameters of up to 1200 mm can be rehabilitated. For larger pipe diameters, the pipe liners are cured with a hot water process, which is significantly more complex than the UV process. Also, a cure by means of steam is known, but this method has not been able to establish in the market. In present day systems, the inner liner is used to allow the curing robot to travel within the tube liner, otherwise the sticky resin would prevent the robot from functioning. In addition, a smooth inner wall of the finished tube is formed by the inner film.

One problem with conventional systems is that the volume percent composition of resin and fiber content is difficult to ensure since the resin may shift during shipping and installation, resulting in variations in properties.

The present invention has for its object to provide a method and an apparatus of the type mentioned above, with the / the effort is reduced in the renovation work. This object is achieved with the features of claims 1 and 6, respectively.

In the method in which the liner is cured by means of hot air, for the curing process, the air supply system can be used, which is also used for setting or pressing the hose liner, whereby the epoxy resin and its pre-reaction less complex Instaliationsmaßnahmen and efficient energy use good controllability or reflectability. As an added benefit, improved statics can also be achieved.

In the device, it is provided that in the pressed to the channel wall liner is introduced a Heißluftzuführvorrichtung, with the curing of the pre-reacted epoxy resin, the liner with hot air beaufschiagbar. This results in corresponding advantages as in the process. The epoxy resin as impregnating resin can be advantageously cured by supplying heat and also allows a pre-reaction for partial curing and also has advantageous mechanical and chemical properties. Epoxy resin is also styrene free.

An advantageous mode of operation is achieved in that within a channel section to be rehabilitated by means of two spaced displaceable zone boundary elements, in particular inflatable bellows or balloons, progressively formed from the beginning to the end of the channel section, zones of at most 10 meters in length, in which fed the hot air for curing becomes.

Further advantages for carrying out the method result from the fact that the epoxy resin is vorreagiert before introduction of the liner into the channel to reduce its stickiness to a residual tackiness so far by temporary warming, that a flow is avoided and a uniform resin distribution is maintained and z. B. can be moved therein a Heißluftzuführvorrichtung used in the liner.

The installation measures are also favored by the fact that in the liner previously a pull rope is inserted as an auxiliary rope to z. B. to collect a compressed air hose easily.

For the construction and use of the hose liner further measures are advantageous in that when producing the hose-like liner on a tube mounted film tube with rotation of the tube with the film tube with a resin-impregnated prepreg several layers obliquely wound, and the wrapped film tube is wound with slight internal pressure on a hose drum. The invention will be explained in more detail by means of embodiments with reference to the drawings. Show it:

1 is a schematic representation for introducing a liner in a channel section,

Fig. 2 is a schematic view for attaching and curing a liner to a channel inner wall and

Fig. 3 manufacturing steps in the production of a liner.

Fig. 1 shows a basic procedure when introducing a tubular liner 1 of a hose drum 10 via a feed side 5 in a portion of a channel 6 z. B. by means of a coupled to the liner 1 pull rope 7 ', which is wound on an output side Zugseiltrommei 11. At the ends of the channel portion are advantageous Umienkglieder, such. B. guide rollers 12 arranged to guide the liner 1 and the Ziehseii T unhindered. For the introduction of installation means, such. As a compressed air hose, in the liner 1 can be inserted into this previously a pull rope 7, which is connected to the installation means and then pulled on the output side of the liner 1. As shown in Fig. 2 section of the channel 6 with the introduced liner 1, this is inflated by means of a compressed air hose 2 and a compressed air line introduced compressed air and pressed against the channel inner wall, including an air supply device with a robot 3 and air outlet openings 30 Ver. is used. A reaction space 4 as a zone within the channel section is formed with two spaced, inflated balloons B1 and B2 arranged inside the liner 1. Further, located at the two end portions of the liner 1, a valve 2, an input-side opening V4, an output-side opening V3 and a closure V5.

In the system shown with the method and device shown epoxy resin is used because it has significant mechanical and chemical advantages over polyester resins. Related to this, another construction of the device and a different curing process are carried out than hitherto customary. Instead of UV radiation in the present system, the energy for curing by hot air is transmitted. This process leads to a reduced Aushärteaufwand and is very economical. The energy supply is advantageously adjustable and the setting up, pressing and curing of the liner 1 in the channel are advantageously carried out via the same air supply system, which thus provides the compressed air and the hot air or hot air for the curing. The curing process can be deliberately predetermined by means of a suitably chosen hardener and optionally additives. is the channel section to be rehabilitated relatively long and results over the entire length of the liner 1 unfavorable for curing temperature gradient, so that at the hose beginning of the liner 1, where the energy is introduced by means of hot air, the resin curing takes place quickly, so the air may possibly be cooled to the hose end of the liner 1 so far that it is below the hardening temperature. This could be prevented with large amounts of hot air blowing through the liner 1 at high speed.

An advantageous embodiment of the method and the device for avoiding this problem is that the device is formed with a zone curing device or the method with a zone curing process. In this case, the robot moves the air supply device during curing only within a predetermined zone, which is the reaction chamber 4. To form the zone z. B. is not more than 10 meters long, for example, between 3 and 6 meters and can be suitably determined according to the circumstances, are in front of and behind a movable car of the robot and the relevant structures for the air supply displaceable zone boundary elements such. B. Teflon balloons, introduced, which can be clamped at that point and delimit the reaction chamber 4. This can be partially cured with relatively small amounts of air, the liner 1, without setting a significant temperature gradient. Furthermore, epoxy resins can be pre-reacted (B-state). In this case, a curing reaction is preferably already initiated outside the channel, but stopped immediately. The epoxy resin then has only a residual stickiness, but is no longer liquid as in the original state or common in today's use. For the later hardening process on the sewer wall, only a reduced amount of energy is required, which is introduced with the introduced hot air. The robot can easily move after pre-reaction of the epoxy resin inside the liner 1. ren, without the need for an inner film, since the residual tack is so low that sticking and contamination of the robot system can be avoided. The liner 1 may, for. B. be pressed with an air pressure of about 5 bar to the old pipe wall of the channel, whereby a sufficiently flat inner surface is achieved. The pre-reaction can also be selectively influenced with a suitable hardener and / or additives.

In addition, by pre-reaction of the epoxy resin, the distribution of the resin / fiber components consistently homogeneous, the percentage composition can be selected appropriately.

When pulling the liner 1 into the channel by means of the pull rope 7, the liner ends are closed. In the production, a relatively thin pull rope 7 was inserted into the interior of the liner 1, in order to prefer this.

After introduction of the liner 1 with the preferably already pre-reacted resin, the opening V4 for insertion of the Druckiuft- hose 2 is released with tensile sheath and attachment to the pull cable 7 on the input side of the liner 1 and then closed again. In this case, the pulling through of the compressed-air hose 30 is made possible by means of a light lip-type radial seal, and an internal pressure is built up in the liner 1. Then, the opening V3 is released at the exit-side end of the liner 1 and the pull rope 7 is removed. The opening V3 is also provided with a light lip seal, in the liner 1 is generated via the valve V2 of the slight inner pressure The compressed air hose 2 is pulled through to the output of the liner 1 by means of the pull cable 7. To remove the Druckiuftschlauchs 2, the shutter V5 is opened, the robot coupled and introduced, wherein the balloons B1 and B2 are not inflated, and then the closure V5 closed.

Subsequently, hot compressed air with slight pre-pressure and at warming temperatures of z. B. introduced about 70 ° C through the valve V2. The epoxy resin usually has a curing temperature of about 80 ° C, so that the epoxy resin can be heated homogeneously at about 70 ° C. In the case of deviating resin systems, suitably adjusted other temperatures should be selected. Subsequently, the valve V2 is closed, the balloons B1, B2 are z. B. also inflated by means of the compressed air hose 2, within the reaction chamber 4 hot air is brought to exit at a temperature of about 120 ° C. The internal pressure of the balloons B1 and B2 can be controlled such that the balloon B2 seals less well than the balloon B1, so that an overflow of hot air from the reaction chamber 4 via the Baiion B2 to the output side with the releasable opening V3 is possible, wherein the opening V3 is adjustable. This allows continuous and volume-controlled hot air to be enforced.

At the beginning of the reaction process, the epoxy resin liquefies slightly. The balloons B1, B2 and the reaction space 4 are briefly subjected to a pressure of about 5 bar to stretch the liner 1, to press against the old pipe inner wall of the channel and to smooth the inside. Thereafter, the curing of the respective liner section takes place at z. B. about 0.5 bar. Then, the reaction space 4 is displaced after a predetermined time under the robot's operation with the balloons B1, B2, whose pressure is correspondingly reduced can be. Finally, after releasing the input side opening V4, the robot is removed therefrom.

With the above procedure channels of any diameter can be rehabilitated, the aforementioned restriction is not given as in UV methods.

In the liner production, as shown schematically in FIG. 3 with reference to two different embodiments, so-called prepregs P made of glass fiber mats are used, which are impregnated with epoxy resin and prereacted (B state) and are wound on a roll H1. Due to the pre-reaction, only a residual tackiness is present, so that the relevant prepreg P can be unrolled without difficulty.

The winding receptacle consists of an axially rotatable, driven tube H2. About the tube H2 is a z. B. about 80 m long film tube H3 slipped, which is closed on the tube side The film tube H3 is inflated with compressed air. In the further procedure, two variants A or B are provided. In variant A of the film tube H3 is provided with 180 ° offset, lying on the inside thickening. The tube H2 has 180 ° offset flattenings H4. The diameter tolerances of foil tube H3 and tube H2 are tight. By fitting dimensions and shaping a twisting of the film tube H3 is prevented on the tube H2, while the film tube H3 axiai can be moved on the tube H2. As an alternative to the flattening H4, two thin ribs can be formed on the tube and two narrow, deep notches H5 adapted thereto on the tube H2. The film tube H3 is slipped formschiüssig over the tube H2, while the tube H2 and the film tube H3 are rotated about its axis with a rotating drive H6. The prepreg P is unwound at the same time and obliquely attached to the film tube H3 according to a slanted guide H7. The film tube H3 is simultaneously drawn at a corresponding speed from the tube H2 under a tension H8, so that a take-up pattern H9 results on the film tube H3, as in the grip band of a tennis racket. It is a multi-layer, for example, five-fold, the winding can be achieved, wherein the prepreg P has a thickness of about 1 mm, while the final thickness of the liner 1 should be about 5 mm. The under slight inner pressure film tube H3 is wound together with the winding on a large ski slide drum 10, similar to a cable drum. Since the film tube H3 is not filled with air plump, the Schiauchquerschnitte on the hose reel 10 represent a horizontal ellipse. With a drum width of 2 m and a drum diameter of 1, 5 m four layers are required on the drum to aufzutrommeln 80 m ( DN 400).

In the variant B of the film tube H3 is homogeneous in its circumference, the tube H2, however, consists in its entire length of two tube half-shells, which form expandable tube halves H11. The tube halves H1 1 can be spread apart a few mm apart. The wound up film tube H3 can thus be tightened, it is slidable when loosening the clamping.

The film tube H3 is slipped over the tube H2 and braced. The tube H2 is axially rotated together with the film sheet 3 while the prepreg P is being wound up, in contrast to variant A, the film tube H3 is not continuously drawn off from the tube H2, but the tube H2 and the film tube H3 are axially movable. This method of simultaneous rotation and winding results in said weft pattern of the tennis racket. After a defined travel path, the entire process is stopped for a short time, the internal tube tension is released, the then axially movable film tube H3 being under tension in the direction of the tube drum 10. The tube H2 is returned to its initial position while the wrapped film tube H3 remains in position. The wrapping process starts from the beginning.

In both variants of the film tube H3 can be removed before or during sewer rehabilitation, fails for the introduction of the hot air desired.

Claims

1. A method for rehabilitating sewers mitteis a resin-impregnated hose-like liner (1) made of fiber composite material, which is pressed using compressed air to the inner wall surface of the sewer and brought to this by means of heated compressed air to cure,

characterized,

that as an impregnating resin, an epoxy resin is used and

that the impregnating resin is temporarily pre-reacted prior to pressing against the inner wall surface of the sewer.

2. The method according to claim 1,

characterized,

that within a Kanaiabschnitts to be rehabilitated by means of two spaced displaceable Zonenbegrenzungseiemente, in particular inflatable bellows or balloons (B1, B2), progressively formed from the beginning to the end of the channel section zones of at most 10 meters in length, in which the hot air is supplied for curing ,

3. The method according to any one of the preceding claims,

characterized,

the epoxy resin is prereacted to such a degree by temporary heating prior to introduction of the liner (1) into the channel to reduce its stickiness, that a homogeneous resin distribution is maintained over the liner wall and / or a hot air supply device inserted into the liner (1) therein can be moved.

4. The method according to any one of the preceding claims,

characterized,

that in the liner (1) before a Zugsei! (7) is inserted as auxiliary.

5. The method according to any one of the preceding claims,

characterized,

in that during production of the tube-like liner (1) a film tube (H3) wound on a tube (H2) is wound in a multi-layered manner with rotation of the tube (H2) with the foil tube (H3) with a resin-impregnated prepreg (P), and the wrapped foil tube ( H9) is wound up on a hose reel (10) under slight internal pressure.

6. Apparatus for carrying out the method according to one of the preceding claims,

characterized,

in that in the liner (1) pressed against the channel wall, a hot air supply device is introduced, with which the liner (1) can be subjected to hot air for curing the resin formed as an epoxy resin.