Climbing jack Operating sequences

1
Climbing jackOperating sequences
2
Lifting sequence
3
Square steel climbing bar
Load applied to top of jack
Load taken by top anchor
Wedges Closed
Top anchor
Hydraulic rams, double acting
Bottom anchor
Steel wedges with teeth to grip the climbing bar
(typical).Can be opened and closed hydraulically
when not loaded
Wedges Closed
Starting position
4
Wedges Closed
ActionExtend rams approx 25mm to transfer the
load to the bottom anchor
Wedges Closed
Lifting Step 1
5
Wedges Open
ActionOpen the top anchor wedges
Wedges Closed
Lifting Step 2
6
Wedges Open
ActionLoad lifting stroke.Fully extend the rams
Wedges Closed
Lifting Step 3
7
Wedges Closed
ActionClose top anchor wedges
Wedges Closed
Lifting Step 4
8
Wedges Closed
ActionRetract rams approx 25mm to transfer load
to the top anchor
Wedges Closed
Lifting Step 5
9
Wedges Closed
ActionOpen bottom anchor wedges
Wedges Open
Lifting Step 6
10
Wedges Closed
ActionFully retract rams
Wedges Open
Lifting Step 7
11
Wedges Closed
ActionClose wedges in bottom anchor. Lifting
sequence complete
Wedges Closed
Lifting Step 8
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Lowering sequence
13
Load applied to top of jack
Load taken by top anchor
Wedges Closed
Top anchor
Hydraulic rams, double acting
Bottom anchor
Wedges Closed
Steel wedges with teeth to grip the climbing bar
(typical).Can be opened and closed hydraulically
when not loaded
Square steel climbing bar
Starting position
14
Wedges Closed
ActionOpen bottom anchor wedges
Wedges Open
Lowering - Step 1
15
Wedges Closed
ActionExtend rams to 25mm short of fully
extended
Wedges Open
Lowering - Step 2
16
Wedges Closed
ActionClose wedges in bottom anchor
Wedges Closed
Lowering - Step 3
17
Wedges Closed
ActionFully extend rams to transfer load to the
bottom anchor
Wedges Closed
Lowering - Step 4
18
Wedges Open
ActionOpen wedges in top anchor
Wedges Closed
Lowering - Step 5
19
Wedges Open
ActionLoad Lowering stroke.Retract rams to
25mm from fully retracted
Wedges Closed
Lowering - Step 6
20
Wedges Open
ActionClose wedges in top anchor
Wedges Closed
Lowering - Step 7
21
Wedges Open
ActionFully retract rams to transfer load to
the top wedges Lowering sequence complete
Wedges Closed
Lowering - Step 8