Category Archives: Case Study

Publication by Dr. Jey Jeyapalan on Mechanical Point Repair

Mechanical trenchless repair sleeves with a locking gear mechanism for pipes of varying inner diameter and offset joints in the range of 6 to 72 in. (150 to 1,800 mm) offer many advantages over relining the entire pipe or using other point repair technologies.

– Dr. Jey K. Jeyapalan

Dr. Jeyapalan has published a feature article in Trenchless Online discussing the advantages of mechanical trenchless point repair sleeves. This discussion centers around distinct characteristics that are exhibited by our QuickLock Point Repair product. We invite you to read and study this article to learn more about how QuickLock offers an enhancement for pipeline rehabilitation of your underground infrastructure.

Read Article Now: http://trenchlessonline.com/mechanical-trenchless-point-repair-sleeve-locking-gear-mechanism-pipes-varying-inner-diameter-offset-joints/

Learn about QuickLock: http://repipetech.com/quicklock

Learn more about Dr. Jeyapalan

Rausch Laser Profiler recommended by URS Corporation

Rausch USA is pleased to present this report created by URS Corporation, conducted independently on behalf of the Michigan DOT. In their latest Examination of Sewer and Culvert Installation report, the URS team invited multiple laser pipe profiling vendors to present their equipment for testing and research. After thorough analysis of the systems they have selected a recommended laser profiling system which best meets their basic criteria considerations – the Rausch laser profiler which uses “spinning laser” technology.

They explain their choice in the below excerpt:

The Rausch circumferential measurement intensity of 20 points can be compared to a 20 point virtual mandrel. While the “spinning laser” circumferential data points are substantially less than the “continuous laser ring” circumferential data points (360 to >1000 in recent upgrades), in our opinion they appear to provide adequate and more accurate diameter information. This is because in our opinion both the laser and camera are located on the same vehicle and camera/laser head and therefore are almost perpendicular to the pipe walls and experience less data fluctuation.

In our opinion, the “continuous laser ring” technology appears to have significant data fluctuation caused by laser and camera vibrations induced by their respective independent transporter movements. The fluctuations are likely lower at reduced speeds (<30 fpm) but in our opinion may still be significant enough to necessitate substantial data filtering during data post processing.

Here is a link to an official excerpt from the recommendation document compiled by URS Corporation which outlines in detail the reason for selecting the Rausch Laser Pipe Profiler over the competition:

URS Recommendation

Rausch Laser Pipe Profiler

Case Study: QuickLock Install in Dortmund, Germany

This Case Study was originally published in the German civil engineering publication bi-UmweltBau. The following is a paraphrased version in English.

In Dortmund, Germany, the Civil Engineering Department’s Urban Drainage unit maintains an approximately 1,200 mile long sewer network. Everyday maintenance and repairs are carried out in the system routinely.

In 2007 significant damage to an existing combined sewer line in Dortmund was revealed by a CCTV inspection. The 10” clay channel laid in the access road Wilsingweg was built in 1914. A renovation was necessary because the structural material has been worn out over the years. In addition, the structure is 200 feet long with a slight slope so that sewage drains poorly. A replacement of the structure is only possible if the receiving pool was also adjusted. Unfortunately this is connected to an intersection of Federal Highway 1, which is the busiest road in Dortmund, Germany. Replacing the line was not an immediate option.

To prevent further damage to the existing canal, it was decided to make a repair with QuickLock sleeves to the 12 most severe individual damages so the channel can continue to operate until the proper repair of the line could be planned and funded. The repair was carried out in April 2007 over two days and completed to the full satisfaction of the network operator.

dortmund quicklock

12 QuickLock sleeves were installed to repair the damaged pipe.

However, the existing counter slopes and the associated accumulation of waste water at the beginning of the pipe structure requires a weekly vacuuming of debris and a high-pressure flushing of the entire line. After more than three years and around 150 high-pressure cleanings of the line with a 1450 psi nozzle, the QuickLock sleeves have neither changed in their position nor shown wear and tear on the materials.

flushing of the line

The Dortmund team flushing the line with QuickLock repairs installed.

The network operators of the waste-water team in the city of Dortmund are satisfied with the QuickLock repair method and will continue to use this in the future where appropriate conditions apply. The special circumstances have documented the flushing strength of the QuickLock sleeves in a very unique way in this case.

Original Press in German: PDF download here

QuickLock Installation at Chambersburg, PA

On Thursday June 20, 2013, Rausch was invited to help the Borough of Chambersburg install their first QuickLock point repair sleeves. Rausch sent their experienced demonstration team to teach the Borough operators how to run the QuickLock system.

Chambersburg Borough Equipment

The first repair was performed in a 10″  clay line. The team set up the inspection truck downstream and sent in an inspection camera to locate and inspect the damages previously located by the Chambersburg operators.

Damaged pipe

A crack was located alongside a joint offset.

Having approved the damage as appropriate for a QuickLock repair, the Rausch team proceeded to demonstrate how to assemble the EPDM rubber gasket and 316L stainless steel sleeve. Then they loaded the QuickLock sleeve onto the packer, which will be pushed into place by a TV camera in the pipe.

IMG_3724

To attach the QuickLock sleeve, remove the rear wheels, slide on the sleeve, and replace the wheels.

The Chambersburg Borough team blocked the flow of the line with a pipe plug at the next manhole. Then, they lowered an operator into the manhole to connect the QuickLock system with the transfer bar attached to the pipe inspection camera.

Chambersburg operator in manhole

The operator connects the packer to the camera-tractor.

Once the system was in the line, the entire operation was controlled from the control room of the Rausch truck. The QuickLock packer was pushed into place over the spot damage in the line. An air compressor regulated the air pressure flow to the packer. The bladder of the packer expanded to lock the sleeve permanently into place. On each QuickLock sleeve, a one-way-ratchet gear mechanism runs along a saw-tooth channel as the sleeve expands. Once maximum compression was reached, the packer deflated and could pass through the installed QuickLock Sleeve.

1st Repair

After the sleeve has been installed.