"

G

nnnn

HYDRA-CAPSULE

nnnn

bar-jacks

nnnn

1050 open

nnnn

890 closed

nnnn

®

nnnn

lifting, lowering or pulling

nnnn

Bar Jacks are 50 tons capacity jacking units capable of lifting,

nnnn

lowering or pulling heavy structures into position using high

nnnn

strength steel threaded bars, the units are normally used for

nnnn

bridge lifting, lowering or pulling (bridge sliding) operations.

nnnn

Each unit comprises of a 60 ton capacity double acting hollow

nnnn

ram jack mounted on a specially fabricated steel stool to

nnnn

enable access to the bottom lock-nut via the access window.

nnnn

Once set-up, the unit's operation is relatively simple, for lifting

nnnn

operations the ram is firstly fully retracted, both the top and

nnnn

bottom lock-nuts are tightened. The ram is then extended to its

nnnn

full stroke which in turn raises the bar, the bottom lock-nut is

nnnn

then tightened, the ram is retracted and the top lock-nut is re-

nnnn

tightened again ready for the next cycle. The procedure for

nnnn

lowering is similar except that a 10mm thick split pack is used

nnnn

above the jack ram to enable the release of the top lock-nut

nnnn

during the lowering cycle.

nnnn

The units are designed so that they can be removed upon completion of the jacking

nnnn

operation leaving just the bar, base plate and lock-nut assembly, they can be reinstalled

nnnn

at a later stage to enable lowering of the structure or de-loading of the bars.

nnnn

Customers should use our specialist diesel or electric driven multi-flow hydraulic pumps

nnnn

when using these units as they provide precise synchronized hydraulic control of multiple

nnnn

sets, we also strongly recommend that you use our specialist teams to install and operate

nnnn

this equipment.

nnnn

lifting beam

nnnn

typical pulling arrangement

nnnn

pull bar

nnnn

Mr

nnnn

jackable

nnnn

skates

nnnn

anchor bar-jack

nnnn

I /

nnnn

Bar-Jacks can also be used horizontally in conjunction with our hydra-skates to enable the movement of large heavy structures by pulling

nnnn

them into position, typical examples are, culvert sections, railway bridges or buildings. The hydra-skates are normally connected together

nnnn

using the actual pulling bar and additional lock-nuts, this distributes the pulling forces evenly between the hydra-skates. The vertical hydra-

nnnn

jacks are inter-linked into sets so that any variation in track levels can be compensated for by the hydraulic control system.

nnnn

6

"