DE4439597C2 - Process for repairing damaged areas of underground sewers - Google Patents

Description

The invention relates to a method for repairing damaged areas underground sewers from a shaft using a line of steel pipes provided with push-in sockets at the pipe ends.

The process is used in particular for the treatment of sewage channels and leachate pipes in landfills made of concrete, stoneware, asbestos ment and plastic, which have fractures from which the waste water in the surrounding earth runs out.

To repair underground sewers are more recent Various methods have become known, in which the renovation of the raw trickle through - without removing the soil covering the canal to be led. It succeeds with the devices and devices used good, single leaks, breaks or leaks in the socket connections to seal. Problems arise, however, where sewers have to be repaired which are a larger number distributed over longer channel sections Damage points, which often ver for many years ago laid, aged concrete sewers is the case, a renovation of each one Damaged area would be too expensive.

The invention has for its object a method for the remediation of Ab to design water channels and leachate pipes, with which also over long distances damaged and therefore leaky channels on very inexpensive can be permanently repaired.

The task is solved with a method, the Ver Driving steps in claim 1 are described in detail. The featured In principle, refurbishment consists of a relatively simple one  Lining the damaged area of the sewer using easy to handle and absolutely corrosion-resistant pipe sections that to be assembled into a tubular column, the length of which is the damaged area covered and takes over the waste water management there. The tubular column is in ge to a certain extent even articulated and can therefore be pushed during Follow the repair process within limits of the channel. After this Tensions that arise later are relocated by traffic loads, Erdla most, tectonic shifts and subsidence recorded without the Strand loses its tightness.

Advantageous developments of the invention are set out in the dependent claims give.

The invention is tert tert explained below with reference to the accompanying drawings. A damaged sewer 2 lying under the ground 1 is shown during its repair. This sewer 2 consists of composite concrete pipes, stoneware pipes, asbestos cement pipes or plastic pipes and has three damaged areas 3 on its circumference, which are renovated with the help of the proposed method, that is, sealed off. Through these damaged areas, a more or less large part of the wastewater seeps into the surrounding soil in an undesirable manner, which, depending on the type of wastewater, can lead to more or less large soil contamination.

The sewer 2 starts from a shaft 4 , from which the sewer 2 is accessible for cleaning and inspection, the shaft 4 is closed with a (not shown) provided with ventilation openings cover. The sewer 2 opens into a second (not shown) manhole, from which one or more sewer lines start.

After the sewer 2 to be rehabilitated has been emptied, a television camera 5 is first inserted in order to locate the damaged areas 3 and to determine their extent. This is conveniently done from the second manhole. This television camera 5 has an electric motor's drive for its six wheels, depends on the power supply and data exchange on a cable 6 and carries a movable, electronic eye 7 and a light source 8th

As soon as the location and size of a damaged area 3 are determined, a first steel pipe 9 is inserted as a precursor pipe from the shaft 4 into the sewer 2 . The length of this steel tube 9 is slightly less than the diameter of the shaft 4 , which is usually about one meter.

This first steel tube 9 is made of stainless steel and has a wall thickness of about 2 millimeters. Its outer diameter is only slightly smaller than the clear width of the sewer 2 . The beginning of the pipe 10 is provided with a reinforcement ring 11 placed on the outside and fastened there, which serves to protect the front pipe edge, which is heavily stressed during driving. At the tube end 12 , a push-in sleeve 13 is provided, which is formed by a pushed over, outer sleeve ring 14 and an inner sleeve ring 15 inserted the same length. The two sleeve rings 14 and 15 are hen so far beyond the pipe end 12 that an annular groove 16 remains between them.

A seal 17 is inserted into the annular groove 16 by injecting a commercially available, corrosion-resistant swelling rubber compound. This material swells strongly when wetted and ensures a reliable, permanent seal.

From the shaft 4 , a second steel pipe 18 is now attached to the precursor pipe as a trailing pipe and the beginning of the pipe is inserted into the annular groove 16 . Part of the swelling rubber mass swells out from the side and forms a sealing bead on the outside and the inside of the follow-up pipe. Except for the reinforcement ring 11 , the follow-up pipe is constructed in exactly the same way as the first steel pipe 9 , that is to say it also carries a push-in socket 13 at its pipe end.

In order to form a strand of interlocking steel pipes, additional steel pipes 18 are now inserted from the shaft 4 as additional trailing pipes. This strand is advanced in the sewer 2 until the pipe beginning 10 of the precursor pipe (the first steel pipe 9 ) has reached the first de damaged point 3 to be repaired.

For advancing the strand in the sewer 2 , a hydraulic thrust cylinder 19 is used , which is inserted in the shaft 4 . This advancement can also be done with the help of one of the known pipe jacking rams or after the cable pulling process via a cable winch at the manhole.

Now a milling robot 20 is inserted from the shaft 4 into the strand of the steel pipes 18 until its working tool 21 has reached the first damaged area 3 on the way. The work tool 21 is an elec trically or pneumatically driven milling head, which can be pivoted and rotated through 360 degrees, so that under observation with the television camera 5 each location of the inner wall 22 of the sewer 2 can be reached.

A damaged area 3 , for example with fragments 23 of the sewer wall protruding into the sewer 2, or other sewer areas that narrow the sewer cross-section are now milled - always with the observation of the television camera 5 - until the inner wall 22 again has its original width and its original cross-section.

To prevent loose parts of the sewer 2 or earth from collapsing, the strand is continuously pushed in together with the milling robot 20 by means of the hydraulic push cylinder 19 during the milling. The steel tubes 18, which are sealed together, are pushed further into an undamaged area of the sewer 2 during milling.

A last steel pipe 24 is now added to the strand as a tail pipe. This end pipe is provided at its end 25 with an externally placed reinforcing ring 26 , which serves as an abutment and for centering. In order to make it possible to move the entire strand inside the sewer 2 in both directions, the precursor pipe (the first steel pipe 9 ), the trailing pipes (the second steel pipe 18 and the others) and the end pipe (the last steel pipe 24 ) are inserted in sections miteinan connected by blind rivets 27 which pass through the push-in sleeves 13 .

The milling robot 20 that is no longer required is now moved out of the strand of pipes 9 , 18 , 24, which are inserted into one another at the intended location in the sewer 2 , to the shaft 4 . This milling robot 20 is connected by means of a connecting cable (not shown) to a command station next to the shaft 4 (not shown).

To ensure the function of the inserted into the sewer 2 strand of steel pipes 9 , 18 , 24 in the sense of sealing the channel, who the ring gaps 28 between the reinforcing ring 11 of the precursor pipe and the reinforcing ring 26 of the tailpipe on the one hand and the inner wall 22 of the sewer 2 on the other hand filled with a sealant 29 and thus sealed off. For sealing, a polyurethane gel is pressed into the annular gaps 28 by means of known devices. This measure also takes place under observation by means of the television camera 5 .

Finally, after the sealing of the annular gap 28, the television camera 5 is pulled out of the sewer 2 .

Reference list

1 ground
2 sewer
3 damaged areas
4 shaft
5 television camera
6 cables
7 eye
8 headlights
9 (first) steel pipe
10 pipe start
11 reinforcement ring
12 pipe end
13 push-in socket
14 sleeve ring (outer)
15 sleeve ring (inner)
16 ring groove
17 seal
18 (second) steel tube
19 hydraulic lifting cylinders
20 milling robots
21 working tools
22 inner wall (of 2 )
23 fragments
24 (last) steel pipe
25 end (of 24 )
26 amplifier ring
27 blind rivets
28 ring gaps
29 sealing compound

Claims (6)

1. Method for repairing damaged areas of underground sewers from a shaft using a strand of steel pipes provided with push-in sockets at the pipe ends, characterized by the following process steps:

• a) driving a television camera ( 5 ) into the defective sewer ( 2 ) and locating the damaged area ( 3 ),
• b) inserting a first steel pipe ( 9 ) made of stainless steel as a preliminary pipe into the sewer ( 2 ), the outside diameter of which is slightly smaller than the inside diameter of the sewer ( 2 ), the beginning of the pipe ( 10 ) with an externally placed reinforcement ring ( 11 ) is provided and the plug-in sleeve ( 13 ) carries an annular groove ( 16 ),
• c) entering a seal ( 17 ) into the annular groove ( 16 ),
• d) attaching a second steel tube ( 16 ) made of stainless steel as a runner tube, the tube beginning of which is inserted into the annular groove ( 16 ),
• e) attaching additional steel pipes made of stainless steel as additional runner pipes to form a strand of interlocking steel pipes ( 9 , 18 ),
• f) advancing the strand in the sewer ( 2 ) until the beginning of the pipe ( 10 ) of the precursor pipe has reached the damaged area ( 3 ),
• g) inserting a milling robot ( 20 ) into the strand until its working tool ( 21 ) has reached the damaged area ( 3 ),
• h) milling the damaged area ( 3 ) under observation with the television camera ( 5 ),
• i) constant feeding of the strand together with the milling robot ( 20 ) during the milling to prevent breakage of fragments ( 23 ) of the sewer ( 2 ) and of earth,
• j) pushing the strand of the sealingly interlocking steel pipes ( 9 , 18 ) into an undamaged area of the sewer ( 2 ),
• k) adding a last steel tube ( 24 ) made of stainless steel as the end tube, the end ( 25 ) of which is provided with an externally placed reinforcing ring ( 26 ),
• l) moving the milling robot ( 20 ) out of the strand,
• m) sealing the annular gaps ( 28 ) between the reinforcing ring ( 11 ) of the runner tube and the reinforcing ring ( 26 ) of the tailpipe and the inner wall ( 22 ) of the sewer ( 2 ) by means of a sealing compound ( 29 ),
• n) Extending the television camera ( 5 ) from the sewer ( 2 ).

2. The method according to claim 1, characterized in that the before runner tube, the follow-up tubes and the end tube are connected to one another when inserted by blind rivets ( 27 ). 3. The method according to claim 1 or 2, characterized in that a plastic swelling rubber mass is injected as a seal ( 17 ) in the annular groove ( 16 ). 4. The method according to any one of claims 1 to 3, characterized in that a sealing compound ( 29 ) is pressed into the annular gaps ( 28 ) for sealing. 5. The method according to claim 4, characterized in that a polyurethane gel is used as the sealing compound ( 29 ). 6. The method according to any one of claims 1 to 5, characterized in that a hydraulic push cylinder ( 19 ) is used in the shaft ( 4 ) for advancing the strand.