EP1283968A1

EP1283968A1 - Sealing system for jacking pipes

Info

Publication number: EP1283968A1
Application number: EP01980036A
Authority: EP
Inventors: Thomas Lammering; Peter Faerber; Heiko Höft; Frank Schlautmann
Original assignee: Rg Rohrgruppe & Co KG GmbH; Phoenix AG
Current assignee: Rg Rohrgruppe & Co KG GmbH; Phoenix AG
Priority date: 2000-05-24
Filing date: 2001-05-14
Publication date: 2003-02-19
Also published as: AU2002210127A1; DE20108163U1; WO2001090626A1

Abstract

According to the invention, a sealing system with several sealing rings (5, 5a, 7) is provided on the connection pieces of jacking pipes (10, 11). The system has a leakage testing system whereby testing means are inserted into the pipeline (8a) and into the intermediate spaces (6, 35); and the sealing means are post-pressed through the feed sections (25, 26, 27) into the cavities of the sealing rings and the intermediate spaces (6, 35).

Description

SEALING SYSTEM FOR DRIVE PIPES

The invention relates to a pipe system with jacking pipes and a connection with a sleeve-like guide ring and spigot at the pipe joint, in particular for sewage pipes. The guide ring is attached to one end of the pipe, is mostly made of steel, sometimes also plastic, and has the same outer diameter as the jacking pipes. The tip end has an outer diameter which is chosen to be correspondingly small, so that the tip end can be inserted into the guide ring with sufficient play. Such pipes are also suitable for other water pipes.

The pipe jacking is known in various forms. Mostly a starting shaft and a

Target baptized. In the case of longer lengths, an intermediate shaft is dug. From the

Starting shaft, the jacking pipes are pushed / pressed to the target shaft.

In the preferred method, the individual tubes are pressed forward. The

Pressing pressure is transmitted from one pipe end to the other by a power transmission ring

Transfer pipe end. Mostly it is wooden rings.

The power transmission rings remain between the pipe ends.

Waste water pipes that are not jacking pipes mostly have a socket connection.

The socket connection between two pipe ends consists of a socket or pipe bell and

Spigot. The sleeve or pipe bell is on one pipe end, the spigot on the other pipe end of the connection.

When the connection is made, the spigot end is pushed into the sleeve or pipe bell or the sleeve or pipe bell is pushed onto the spigot end.

The seals should close the gap between the socket or pipe bell and the tip end. From EP 677690 AI it is known to use two seals, and the

Design the space between the two seals in the gap to be compressible. With that

Leaks are made difficult and, if they occur, eliminated again.

BESTATIGUNGSKOPIE The jacking pipes are comparable sleeve connections as for others

Wastewater pipes are not known. Nevertheless, the same leakage problem arises with jacking pipes.

DE 3815141 AI shows a proposal to eliminate the leakage problem.

A rubber seal is provided between the end faces (pipe mirror) of the pipe ends. The rubber seal should be activated.

However, the known solution could not prevail because the rubber seal must also transmit the pre-pressing force and is not suitable for this.

According to the invention, a multi-seal and repairable seal on jacking pipes is achieved in that two ring seals are arranged at a distance from each other in the gap between the guide ring and the tip end and the intermediate ring gap can be acted upon with a test medium and filled with a sealant. In addition or instead of one or both ring seals in the gap between the guide ring and the tip end, a sealing ring and or several sealing rings can also be provided between the end faces of the two pipe ends in a special manner explained below.

In addition to or instead of filling the gap with sealant, activatable ones can be used

Sealing rings may be provided. For activation, the sealing rings can be designed as hollow profiles and provided with an activation agent. Activatable sealing rings are known per se. Examples are EP 0479172 B1 or EP 0340659 AI and DE

3815141 AI referenced

Special designs are also considered as sealing rings.

This includes a combined seal, e.g. in the form of a full profile in the area of

Sealing surfaces and an adjoining hollow profile, in particular one

Hose Profiles. For the sealing rings, it is often sufficient if the sealing rings are only under

Pressure should be set or, with sufficient pressure, close to the associated one

Sealing surfaces are brought to the plant.

The sealing rings usually consist of permanently elastic material. Styrene-butadiene rubber (short form SBR) or ethylene-propylene-diene mixed polymer (short form EPDM) is preferably used.

Changes in temperature and the like are compensated for by the compressed elastic material. In that sense, it is convenient to activate one too permanently elastic material is used or if the same material is used as the gap filling. Permanently elastic and compressible sealing materials are, for example, silicone and acrylic sealing materials. For the less difficult sealing problems, a bentonite suspension can also be pressed into the sealing rings. The bentonite suspension has the advantage of being repressible.

The sealing rings can lie in recesses in the tip end and / or in recesses in the guide ring and / or in recesses in the force transmission ring. A multi-part design of the power transmission ring is also advantageous. At least two concentrically arranged rings are provided, between which a distance is provided for the arrangement of a sealing ring. In addition, an arrangement of a sealing ring on the inside and / or the outside of the power transmission ring is possible.

Air, for example, is suitable as test equipment. A certain pressure can be built up and a certain period of time can be selected as a benchmark for the seal, for which the sealing system maintains the air pressure without any significant pressure loss.

Optionally, the test equipment and / or sealant is supplied via one or both sealing rings or one or more separate supply lines are provided for supplying the test equipment and / or sealant. Common and different supply lines can be provided for the test means and the sealant. Optionally, feeds / lines for test equipment and / or sealants can be guided in the longitudinal direction and / or in the circumferential direction and / or in the radial direction through the pipe jacket and / or the guide ring and / or the tip end. Several jacking pipes, if necessary all jacking pipes can be provided with common feeds / lines. Then a coupling of the lines is provided at the pipe ends. Connectors can also be used as a coupling.

Separate supply lines for test equipment and sealants are cheap. Then the supply line for the test agent can be vented to ensure that there is no pressure to prevent the penetration of sealant.

Optionally, the design is also used to visually inspect a complete filling of the cavity to be sealed. The test can be carried out using sealant that emerges from the test medium supply after the cavity has been completely filled. The sealing rings can be pulled / pushed onto the spigot end after the jacking pipes have been completed.

For jacking pipes made of concrete, the production takes place in a mold. The sealing rings can also be inserted into the mold during manufacture and can thus be enclosed by the concrete. This procedure is recommended if the gap between the tip end and the guide ring is very narrow and / or if the sealing ring cross-section is relatively large and / or if the sealing ring does not survive an expansion associated with the mounting without permanent deformation and / or if the sealing ring is anchored in the Concrete is desired and / or if the subsequent incorporation of a groove for the sealing ring involves additional work and / or if the sealing ring is connected to one or more test lines and / or other lines.

The sealing rings can have a closed profile cross section. A distinction must be made between the full profile cross section and the hollow profile cross section. The hollow profile cross section has a cavity on the inside, preferably tubular profiles are used as hollow profile cross sections. The lines leading to the sealing ring for test equipment and sealants preferably consist of the same material as the sealing ring and are welded or glued to the sealing ring.

Combined sealing rings can also be used, e.g. Consists of an annular full profile, which forms the sealing surfaces, and a hose profile that can be pressurized with a pressure medium / sealant. The hose profile can perform two tasks: firstly, create an even circumferential pressure on the sealing ring, secondly, guide the sealant to any leakage points.

Optionally, the hose profile is constantly pressurized with air pressure. The air pressure can be readjusted continuously or at intervals.

It is also possible to use special open cross sections for the sealing rings. The model for this cross-sectional training are the automotive tires as open cross-sections. The car tires form a closed cavity with the rim. Accordingly, the sealing rings can form a closed cavity with the tip end or the guide ring when they are in contact there. The profile cross-section can be a motor vehicle tire be reproduced or deviate from it round and / or angular. U-shaped or W-shaped or M-shaped profile cross sections can result. Such sealing rings form a seal in the manner of a labyrith seal with a plurality of sealing lines running around one another. The profile cross-section can also be composed of several adjacent M-shapes or W-shapes.

Such sealing rings can be pushed / pulled with the open cross-sectional side over the outlet openings of the lines / feeds for test equipment and sealants. This is favorable for lines / feeds that have been molded into the jacking pipes. Optionally, such sealing rings are provided with a special seat in the tip end or in the guide ring, corresponding to the seat of a motor vehicle tire in the rim.

It is advantageous if the lines / feeds for test equipment and / or sealants on the jacking pipe are provided with a releasable closure at least on the inlet side. This enables a clean connection of additional lines / feeders. The closure can act in both directions. One-way closures are also possible, e.g. Check valves.

Check valves can also be provided on the outlet side of the lines / feeds. This is advantageous if several lines / feeds are provided for pressing the sealant and if the sealant solidifies to such an extent that, after at least a time, it is no longer possible to inject from the same line / feed. In this case, the repressing can be carried out by another feed which has not yet been subjected to sealant and on which the check valve arranged on the outlet side has prevented undesired penetration of sealant.

The lines / inlets that open on the inside of the pipe at the ends facing away from the sealing rings are accessible from there. In the case of walkable jacking pipes, the maintenance team can carry out the leak test and repress the seals from the inside of the pipe. It is favorable if the mouth openings of the feed lines are above the water level. This counteracts calcification and soiling of the openings.

In non-accessible jacking pipes, the leak test and re-grouting can be carried out by a robot. Commercial robots have one Optics / camera with which the robots are controlled by sight, and tools for drilling and sealing as well as for receiving and dispensing sealants. To the invention

Known functions can be changed using the robots.

In this way, the robot can be equipped with a pressure container for compressed air. The

Pressure vessels can absorb the compressed air for the leak test and release it for the test processes after connection to the corresponding lines.

The sealants described above can be handled like compressed air. To the

A pressure vessel is suitable for storing the sealant in the robot. It is advantageous if the pressure vessel is divided with a membrane, so that part of the

Pressure vessel that borders on the membrane can be filled with compressed air. The compressed air is further compressed when the other part of the pressure vessel, which borders on the membrane, is filled with sealant. The compressed compressed air forms a pressure source and supplies the pressure required for re-injecting sealant after connection to the relevant line / feed.

The necessary pressure can also be generated with a pump. The pressure can act on the sealant directly or indirectly, as with membrane technology. In the event of direct action, the sealant is conveyed through the pump, thus building up the pressure.

Different designs are suitable for the pump, e.g. Piston pumps, as

Screw conveyors designed pumps.

The known robots are self-propelled and can be controlled remotely. The remote control can be a radio remote control or a cable remote control.

The supply station for the robot can be set anywhere within wide limits.

The robot can always return to the supply station. A mobile supply station is advantageous in order to reduce travel distances. The mobile supply station can hold a cover over each sewer cover and, after opening the sewer cover, feed all the media and energy used in the robot again.

On the way, the mobile supply station can follow or even lead the robot moving underground in the sewer system.

A special robot can also be used as an option.

The special robot differs from known robots by one or more

Rails in the jacking pipes. The rails make it easier to control the Robot. The rails can be made of metal. Due to the low load on the robot, plastic can also be used for the travel rails. There are also stainless steels and other steels that contain the aggressive components of the

Can withstand waste water. However, these steels are very expensive. Plastics that can withstand aggressive wastewater in the same way or even better cost only one

Fraction.

The rails are preferably fastened in the ridge / pipe crown of the jacking pipes.

In addition to the running track, supply lines are optionally also provided in the jacking pipes. The supply lines can complement or reverse the rail construction, the lines can even form the running rails. Connections for the robot are provided at intervals on the supply lines.

Of the line pipes, individual pipes or all pipes can be provided with a memory chip and a transponder at both ends or only at one end. The use of memory chip and transponder is known per se and is preferably used to store manufacturing data. The data can be called up at any time using suitable senders and receivers. Another purpose is primarily sought here. The test data and maintenance data / post-grouting data are to be recorded with the memory chip and transponder. On the way, it can be queried at intervals or for acute reasons (e.g. in the event of a leak) which leaks have already occurred at the same point. The storage of the manufacturing data includes a valuable addition.

In the drawing, an embodiment of the invention is shown.

Fig. 1 shows a connection between two jacking pipes 10 and 11 made of concrete. Only a section is shown. The jacking pipe 10 is provided with a steel guide ring 12. The guide ring 12 is concreted in and secured by anchors 13 in the concrete. The guide ring 12 has a slightly smaller diameter than the jacking pipes 10 and 11.

The jacking pipe 11 is constricted at the end shown. The end formed in this way is called the pointed end. The diameter at the tip end is like this chosen that the tip end can be picked up by the guide ring 12 with sufficient play.

The jacking pipe 11 is configured at the end facing away from the spigot end in the same way as the end of the jacking pipe 10 shown in FIG. 1.

When assembling the jacking pipes 10 and 11, a power transmission unit is provided between the two pipe ends shown. The power transmission unit consists of two concentrically arranged wooden rings 20 and 21. The outer diameter of the wooden ring 21 is selected so that there is a distance from the inside of the wooden ring 21.

The distance is chosen so that a sealing ring 5 can be positioned there.

There are also two between the guide ring 12 and the tip end of the jacking tube 11

Sealing rings 5a and 7 are provided. For all sealing rings 5, 5a and 7 are in concrete

Integrated grooves that accommodate the sealing rings. All sealing rings have one

Hollow profile. The hollow profile is designed so that it is sufficient in itself

Sealing effect developed with the associated sealing surfaces.

As soon as a leak is found, a sealant can be fed into the

Cavity are pressed. In the present case, a permanently elastic sealant is used

Plastic resin.

The line 25 belongs to the sealing ring 5, the line 26 to the sealing ring 5a

Sealing ring 7 the line 27. The lines are molded into the concrete. The openings of the pipes are in the jacking pipes above the wastewater level.

To press the sealant, the mouthpiece of a sealant press is then pressed into the respective opening and the sealant is then pressed in.

In the exemplary embodiment, the leakage results from a test with compressed air. The compressed air is fed into the feed ring 12 from a compressed air line 8a which runs partly axially and partly radially through the pipe jacket of the jacking pipe 10. There, inside channels 30 and 31 direct the compressed air into the space 6 between the two sealing rings 5 a and 7. From there, a further partially axially and radially extending pressure line 8a leads in the jacking pipe 11 to the opposite pipe end. Through the lines 8a all jacking pipes are connected to each other when the pipes are in operation, so that all connections of the pipes can be checked for their seal with a single pressurized air.

If the sealing ring 7 does not have a sealing effect, the compressed air escapes to the outside; if the sealing rings 5a are not sealed, the compressed air escapes into the intermediate space 35. A sensor 1 is provided there. The sensor 1 indicates the leak. The sensor 1 is based on the fact that the leakage in the intermediate space 35 results in an increase in pressure. A line 4 leads from the sensor 1 to the inside of the pipe.

Fig. 2 shows another exemplary embodiment of the invention with waste water pipes 37 and waste water therein. A track 39 for a robot 38 is provided in the ridge of the sewage pipes 37. The robot 38 has the task of eliminating detected leaks by pressing sealant.

In further exemplary embodiments, the sealing rings have the shape shown in Fig.3. It is a composite sealing ring with an external full profile ring 50 T-shaped cross section and an underlying profile tube 51. The full profile ring 50 sits with its vertical cross-sectional web in the illustration in a groove 52 of a tip end. The horizontal cross-sectional web of the full profile ring 50 engages in the gap between the tip end and the guide ring. In the exemplary embodiment, the full-profile ring 50 consists of a permanently elastic EPDM, but of a firmer quality. Sufficient play is provided for the joining of the tip end and guide ring. After the installation of the jacking pipes, the sealing is effected by pressurizing the profile hose 51 with pressure medium. As a result, the full profile ring is lifted in its seat and pressed against the sealing surface of the guide ring. The pressure medium can be air or a sealant, or a bentonite suspension.

In another exemplary embodiment, such a soft, resilient material is chosen for the full profile ring 50 that a play between the sealing ring and the guide ring is unnecessary. LIST OF REFERENCE NUMBERS

1 sensor

4 line

5 sealing ring

5a sealing ring

6 space

6 sealing ring

7 sealing ring

8a compressed air line / line

10 jacking pipe

11 jacking pipe

12 guide ring

13 anchors

20 wooden ring

21 wooden ring

25 line

26 line

27 line

30 channel

31 channel

35 space.

37 sewage pipe

38 robots

50 full profile ring

51 profile hose

52 groove

Claims

claims

1. Pipe system for jacking pipes and a pipe connection with a sleeve-like guide ring at one pipe end and a spigot end at the other pipe end, in particular for sewage pipes and in particular with concrete pipes, and with a power transmission unit between the corresponding ends of the pipe connection, characterized in that in the gap between the spigot end and guide ring a multiple seal with sealing rings (5 a, 7) is provided, the seal being compressible with sealant.

2. Pipe system according to claim 1, characterized by at least two spaced sealing rings (5a, 7).

3. Pipe system according to claim 1 or 2, characterized in that instead of a sealing ring (5a, 7) between parts of a P raft transmission unit and / or in recesses of a power transmission unit and / or above and / or below a power transmission unit, a further sealing ring (5) is provided is.

4. Pipe system according to claim 3, characterized in that the power transmission unit is arranged from concentrically arranged rings and a sealing ring (5) is provided between the rings of the power transmission unit.

5. Pipe system according to one of claims 1 to 4, characterized in that the sealing rings (5,5a, 7,50,51) consist of solid profiles and / or hollow profiles and / or are in one piece or are composed.

6. Pipe system according to claim 5, characterized in that the hollow profiles are designed as a tube profile (51) and / or are combined with a full profile (50).

7. Pipe system according to claim 6, characterized in that the full profile forms the sealing surfaces of the sealing ring (50, 51).

8. Pipe system according to claim 5, characterized by an open hollow profile, which forms a closed profile in the functional position at the tip end or guide ring with the tip end or guide ring.

9. Pipe system according to claim 8, characterized in that the sealing ring and the associated seat on the spigot end or in the guide ring are simulated the cross section of a motor vehicle tire and the seat in the associated rim or that the sealing ring is a U-shaped or W- shaped or M-shaped cross section.

10. Pipe system according to one of claims 1 to 9, characterized in that the hollow profiles (5,5a, 7,50,51) and / or the intermediate space (6, 35) between the sealing rings (5, 5a, 7) after leakage is pressed with sealant.

11. Pipe system according to one of claims 1 to 10, characterized in that lines for sealants lead to the sealing rings (5,5a, 7,50,51) and / or to the spaces (6,35).

12. Pipe system according to claim 11, characterized in that the lines (25, 26, 27) for the supply of sealant are guided axially and / or radially and / or in the circumferential direction through the pipe wall of the jacking pipes.

13. Pipe system according to claim 1 1 or 12, characterized in that the feed lines for sealant from the inside of the tube for pressing the sealant are accessible.

14. Pipe system according to one of claims 1 to 13, characterized by a leakage test at the connection of the pipe ends.

15. Pipe system according to claim 14, characterized in that at the same time several pipe connections experience a leakage test.

16. Pipe system according to claim 11 to 15, characterized in that all the spaces (35) between the sealing rings (5a, 7) via lines (8a) for test equipment are interconnected.

17. Pipe system according to one of claims 11 to 16, characterized in that a pressure sensor (1) sits in the space between the sealing rings (5a, 5).

18. Pipe system according to claim 17, characterized in that a ventilation line (4) is connected to the pressure sensor (1).

19. Pipe system according to one of claims 1 to 18, characterized by the use of a robot (38) for the compression of the sealant and / or for the leakage test.

20. Pipe system according to claim 19, characterized by rails (39) for the robot in the jacking pipes.