Jointing & Laying

 

Jointing Procedure
Forsheda 140 Lamell Sliding Rubber seal permits installation with very little force as there is lubricant enclosed within the seals sliding layer, thus there is no friction between concrete pipe and rubberseal. The sliding layer, when in final position locates itself in the gap between spigot and socket and then prevents concrete to concrete contact if pipe is deflected. Click here to view larger diagram 

Installation

  • Fit the seal onto spigot as shown on Fig. 1.
  • Centre the spigot in the socket as Fig. 1.
  • Slide the pipes together and the lubricated flap will move over top of the compressed rubber seal as Fig. 2 and finish as shown on Fig. 3.

The relevant pipe diameter is stamped on each rubber ring. Rubber rings should be carefully stored and protected from sunlight, oils, greases and heat, if rings have been tied they should be separated a few days before using in order to eliminate minor impressions the tying may have caused.

Joint rings are normally Styrene Butadiene Rubber (SBR) complying with BS 2494. Nitrile and Ethylene Propylene Rubber (EPDM) can be supplied if specifically ordered to meet special conditions, but are not normally available from stock.

Laying Pipes
After ensuring that you are using the correct bedding, Diameter and class of pipe as specified and that jointing rings are compatible with the pipes to be laid, then the following procedure should be followed:

Installation Instructions

Clean the Socket End
Brush and wipe the end of the pipe fitted previously to remove any particles or water, ensure that the receiving socket is clean and undamaged.
Inspect Joint Surfaces
Inspect the joint faces for damage which may affect the performance of the joint.
Handle Pipes with Care
Use only proper lifting equipment, eg woven slings. Make sure the pipe is balanced so that it is horizontal.
Fit the Ring
Fit the correct ring the in correct position and equalise the tension by lifting out intervals at its length and letting it snap back against the socket.
Clean the Socket End
Brush and wipe the end of the pipe fitted previously to remove any particles or water, ensure that the receiving socket is clean and undamaged.
Prepare the Trench Bed
Make a recess in the bed to accommodate the pipe.

Line Up the Pipes

Carefully centre the spigot within the socket. 
Make the Joint
The jointing procedure should develop a steady controlled push or pull until joint is in final position. Method of jointing will depend on size of pipe. Ensure timber blocks are used to prevent damage to socket of pipe.

Mechanical plant should not be used to push pipes down to their correct level.

When jointing pipes the last pipe laid sometimes has a tendency to reassert therefore it should be propped and checked before laying commences.

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