probst HVZ-UNI-II Instructions D'emploi page 86

Adjustments
●
Close main clamping completely. Make sure, at least about 30 mm of cylinder lift is still available on the main
clamping cylinder in order to exert real clamping pressure to the layer of paver with main clamp, even when there
are slight tolerances in the pavers.
Recommendation:
●
If necessary, for example when laying pressure-sensitive pavers, such as grit pavers, the hydraulic clamping pressure
can be adjusted at the pressure relieve valve . Turning this valve anti-clock-wise, the pressure can be reduced to
about 80 bar. Pressure can be checked on the manometer.
●
Open side clamping completely.
Recommendation:
●
Lift up HVZ-UNI-II slowly.
●
If the gripped layer bends down in the middle too much, stop the first gripping trial.
●
Due to the poor quality in regard to the gripping security, the gripping depth has to be increased (see 5.2.2)
●
Increase the gripping depth step by step until a secure gripping of the layer is possible . If required, the quality of the
pavers in regard to the gripping quality can be checked by building up a tower as described in 4.5.2.
●
When the tower tends to fall over, contact the manufacturer and supplier of the laying clamp.
●
Simulate laying reality by abrupt lifting and lowering actions with a gripped layer of pavers. If the pavers fall out,
increase the gripping depth again.
●
When having poor quality, packaging mostly caused by weak pallets. It can happen
that pavers which are shifted into running bond directly on top of the pack, are
falling down on the sides because they are not supported any more. In this case
pick up layer without shifting them, position them on the ground and do the
shifting on the ground.
●
Having poor quality pavers in regard to the gripping security (layer tends to bend
down in the middle when being gripped and sometimes the complete layer
collapses) it is recommended to let the side clamping in the closed position and
only open the side clamping just before laying the pavers down.
●
Lift up HVZ-UNI-II slowly.
●
If the gripped layer bends down in the middle too much, stop the first gripping
trial.
●
Due to the poor quality in regard to the gripping security, the gripping depth has to
be increased
●
Increase the gripping depth step by step until a secure gripping of the layer is
possible . If required, the quality of the pavers in regard to the gripping quality can
be checked by building up a tower as described in chapter "Check on the gripping
quality of certain layers of paving stones".
●
When the tower tends to fall over, contact the manufacturer and supplier of the
laying clamping.
●
Simulate laying reality by abrupt lifting and lowering actions with a gripped layer of
pavers. If the pavers fall out, increase the gripping depth again.
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