Softly, softly seamless lifters provide controllable power even on awkward sites
Awkward site conditions including soft ground, confined trenches, crash recovery areas and uneven earthworks can create hazards for conventional lifting technologies.
Often there is insufficient room overhead to employ suitable cranes, even if they can be brought overland to a remote site. Sometimes also there is insufficient stability underfoot to employ lifters that produce high point loads both on the ground and on the object being lifted.
One solution to the problems can be seamless inflatable lifting cushions from Pronal, an innovative elastomer manufacturer whose products are distributed in Australia by Air Springs Supply Pty Ltd.
The Pronal range of CLT lifting cushions from Air Springs Supply can delicately raise loads ranging from heavy vehicles, pipelines and plant through to beams, bridge components, building components, Machinery and resource development structures.
Pronal products have been proven worldwide in projects as diverse as lifting locomotives and heavy vehicles through to submersible types used, for example, to raise artefacts from the ocean liner Titanic, sunk nearly four kilometres deep in the Atlantic.
Air Springs Industrial Products Manager Mr James Maslin says the Pronal bags combine the advantages of high durability and power with gentle, precisely controlled lifting that can spread the load over broader surfaces of the object being lifted, rather than focusing the power on point loads.
They can be used in confined spaces underneath inaccessible loads ranging from engines and plant, through to foundations of bridges, buildings, machinery, pipeline structures and resource development rigs requiring lifting for inspection and repair.
"Sometimes cranes, slings or cylinders may not be the right choice for lifts with particular technical challenges in terms of lifting surfaces or surfaces to which lifting force is to be applied. Where companies are contemplating considerable investments in custom-engineering conventional lifting platforms, it may be well worth considering the simple principle of pneumatic actuation," he said. This can be particularly so when working in confined spaces, such as trenches and mines, where there is little room beneath pipelines and plant. Features of the Pronal product include:
- As well as straight lifting, they can be used for pressing, clamping, tilting and guiding
- Strokes from 70-585 mm (CLT), with longer strokes provided by combinations of cushions
- In addition to standard sizes, specific sizes and shapes can be made to order.
- Ease of use, with inflation either by compressor or simple air cylinders
- Inflation pressures up to eight bar, regardless of stroke (CLT models CPB pressures vary from under one bar, depending on model)
- Construction from threaded layers coated with chemical resistant elastomer, hot vulcanised under pressure in one operation.
- Non-slip surface providing maximum friction when stacking two cushions
- Control systems tailored to particular uses