Jacking Pipes Request Quote Brochure

The In-the-Wall Joint pipe is a watertight pipe using a sliding rubber ring in the joint.

The joint is formed inside the wall of the pipe, making this type of pipe ideal for jacking or tunnelling operations.

The Sliding Rubber Ring system used compromises a rubber “O” type ring, which is lubricated and located on the tip of the spigot end of the pipe. When the pipes are joined, the rubber ring is compressed and slides down the spigot.

No lubrication is required. The seal is formed between the Socket (or female end) and the outside of the Spigot (or male end). More detail on the joining operation can be found under Handling and installation. The pipes are supplied in lengths of 2,44m or 1,22m and in 50D, 75D and 100D strength classes. Special designs can be accommodated.

Custom-made Products:
The pipes are manufactured in 2,44m and 1,22m, but can be manufactured in special lengths to customer specification.

The standard strength classes for these pipes are 50D, 75D and 100D. Special intermediate strengths or heavier loadings can be designed and manufactured. These are subject to various material constraints, but will be evaluated by our engineers on an ad hoc basis.

“Lined pipes” can be manufactured. In the past, steel lined concrete pipes have been manufactured for high pressure pipelines. These were used to “Jack” the steel pipes underneath a road. See picture.

Please contact your nearest Rocla branch for details on these products or utilize the contact us facility.

Sliding rubber rings are supplied by Rocla.

Areas of Use:
In-the-Wall Joint Pipes are used primarily in jacking or tunnelling applications.

They are ideal in applications where maintenance-free, high quality solutions are required.

Handling and Installation:
When handling any concrete products, it is important to remember that, as concrete is a heavy and somewhat brittle material, bumps or shock loads of any description are liable to damage the product. This applies particularly to sharp edges.

When offloading the products on site, the equipment must not damage the products. Sewer pipes do not have a lifting hole, as the system must be watertight. A 150mm sling passing around the center of gravity of the pipe must be used to handle the product. When placing the product on the ground, it is important to note that the pipe must not rest on the socket portion. The full weight of the pipe must be borne by the barrel of the pipe.

During the installation, the trench or excavation must be prepared to the Site Engineers specification. Once the bedding is in place it is ready for the pipes. The specific area where the socket end would rest must be removed, so that the pipe can be horizontal during installation, and that the pipe can rest on the barrel once in place.

Each pipe must be sealed with a rubber ring. This must be place on the spigot end and located in the correct position as indicated by the locating groove. The rubber ring must be of equal tension around the barrel. This can be attained by inserting a screwdriver, or similar object, between the ring and the pipe, and running the screwdriver around the barrel twice.

The pipes are lowered into place using the same handling technique as before. Once the pipes are lined up, it will be necessary to pull the spigot end into position to fit into the socket end of the already laid pipe whilst the pipe is still suspended. This can either be done by levering the pipe forward, or by means of a tirfor system, which pulls the pipes together.

Once this is completed, and the pipe is correctly sealed, the pipe can be released to lie on the bedding. It must be noted that again, the full weight of the pipe must rest on the barrel only and not on the socket area. The next pipe can then be lowered into position.

Backfilling of the pipe to the engineer’s specification is of utmost importance, as the pipe strength is designed to suit the installed condition. Care must be taken to compact underneath the pipe curvature to ensure a good foundation is in place. For more information on pipe installation, please use the contact us facility, as our staff can be of assistance on site with the installation activities.

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