Buderus Manual on Trenchless Installation of Ductile Cast ... - Duktus

Inserting the locking segments
DN 00 - DN 1000 BLS ® joints
The joint must not be deflected angularly when the locking segments are being fitted.
First insert the locking segments through the opening in the socket and then distribute
them around the circumference working alternately left and right. Then rotate all the
segments in one direction so that the last segment can be inserted through the opening
in the socket and moved to a position where the joint is securely locked.
Only a small part of the humps on the last locking segment must be visible through the
opening in the socket. If any segments happen to jam, they should be moved to their
intended position by moving the pipe as it hangs from the sling and tapping them gently
with a hammer.
Under no circumstances must the socket or the main body of the pipe be hit with the
hammer!
Locking
Pull all the segments back towards the
outside until they butt against the bevel of
the locking chamber. Then fit the clamping
strap over the segments in the way shown.
Then tighten the clamping strap, but only
gently so that the segments can still be
moved. Now line the locking segments
up properly. They must lie completely flat
against the body of the pipe and they must not overlap. Then tighten the clamping strap
up sufficiently tight for the locking segments to bear firmly against the pipe around the
whole of its circumference. It is now no longer possible for the locking segments to be
moved. Apply axial traction (e.g. with a locking clamp) and pull the pipe out of the joint
until the welding bead comes to rest against the segments.
When the joint is in an undeflected state, the longitudinal distances from the locking
segments to the end-face of the socket should all the approximately the same.
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