Layher Allround – The Ideal Scaffolding System for Industrial Applications

Mithilesh Kumar
Mithilesh Kumar, Director, Layher Scaffolding Systems Pvt Ltd
Layher Group which produces high-quality scaffolding systems in Germany, has worldwide presence with over 40 sales subsidiaries.

For current challenging and complex scaffolding applications – i.e. wherever conventional scaffolding technology falls short of optimal thus cost-effective use, Layher Allround Scaffolding convincingly comes in with an unmatched range of advantages: unbeatably fast assembly, persuasive economic arguments and an extensive range of series-produced accessories.

More Possibilities - Layher Products and Services

Layher's products characteristics and services help customers achieve long-term success and increase the profitability of their companies. Its Allround Scaffolding has been established as a synonym for modular scaffolds and offers unsurpassed versatility to be used in construction sites, chemical industry, power plants, aircraft, shipyards, event sector, theatres and arenas.

Allround scaffolding uses a simple, unique and bolt free connection technology. Sliding the wedge head over the rosette and inserting the wedge into the opening immediately secures the component. There is still sufficient play to secure the other end of the ledger. A hammer blow to the wedge transforms the loose connection into a superbly strong structurally rigid one. The face of the wedge head is now precisely positioned against the standard. Connections in quick to assemble and spanner less scaffolding systems make a unique combination: providing structural strength immediately on assembly and subsequent ultimate force transmission while offering a choice of automatically right – angled or splayed connections with universal safety right from the start.

Layher Scaffolding System
Layher Allround for external maintenance of Tank Layher Allround for Internal maintenance of Tank

To transfer pulling force, every frame is secured by locking pins or bolts to each other. In this way the tower can be assembled on the ground and placed by crane.

Application of Layher Allround Scaffold for the maintenance of Gas Tank

The gas tank operated by Refinery is currently being refurbished, and corrosion prevention experts have to treat the entire surface of the tank. Safe access to all parts of the gas tank is assured with the use of a modular scaffolding system. Using Layher's superior Allround equipment is only solution for complete maintenance of circular tank.

The advantage lies in the speed with which not only the right angle can be automatically obtained with the system, but also variable angles can be achieved, if required. This is done by fitting the ledgers in rosettes each with four holes at right angles, with four further larger holes (usually used for diagonal braces) being used to facilitate variable angles. This means that the erectors can also make connections at any angle as indicated by the conditions on site. The Scaffolder can easily, thanks to the eight possible connections in every connector, make adaptions quickly and optimally for almost any application.

These advantages ensure the optimum conditions for effectively enclosing the round tank with scaffolding. Allround Scaffolding was easily adapted to follow the contour shape of the sphere without difficulty. The erectors didn't need to create complex tube structures, saw off tubes all the time, repeat measuring of connections or constantly align the upright elements. The wedge head provides an all in one simple yet stable connection, coupled with a logical assembly sequence and integral safety. Hot-dip galvanisation and certified quality assure Layher's top-quality products are extremely long-lived.

Several work levels were required plus a lift going up 16 meters were required to be integrated into the scaffolding. The challenge set by this particular job was to follow as precisely as possible the double-curved surface of the tank. This was possible due to the extensive catalogue of parts Layher are able to offer.

Conventional anchoring to the tank was not possible. The scaffold erectors were only able to make connections to the all-round steel profile – the runner rail for the inspection ladders – at the tank's "equator" using scaffold couplers. Above and below this anchoring level, the scaffolding was secured by all-round steel cables. A Layher landing-type stairway tower allowed convenient access to the scaffold at various levels.

The top lift of the scaffold at the top of the tank called for Layher's expertise. Following the increasingly tapered scaffolding radius above the equator, Layher's Technical Bureau designed a series of connected lattice girders to the topmost Allround standards which made them converge in tension-resistant form. The scaffolders then placed the structure on the highest point of the gas tank using four Allround standards.

This method has already proven its worth in time and money saving process.

NBMCW October 2014

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