Versatile Solution For High Rise Industrial Structure
Layher has worldwide presence with more than 43 sales subsidiaries. The products are being used by industries like Construction, chemical plants, power plants, at shipyards and offshore. Now days for demanding 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.
The proven combination of positive and non-positive connections in a rapid and bolt-free system technology with AutoLock function facilitates connections that are automatically right-angled, obtuse-angled and acute-angled – and ensures built-in safety at the same time. Layher Allround Scaffolding has now become synonymous with modular scaffolding on the market.
Since its launch in 1974, this original system has been undergoing continuous development and offers an impressive variety of use: on any construction site, in industry, chemical plants, power stations, shipyards and for events.
Even with very difficult layouts and architecture styles and with heightened safety requirements, Allround Scaffolding is the faster, safer and more economical solution.
Layher’s present product characteristics and services help customers achieve long-term success and increase the profitability of their companies. The Layher Allround Scaffolding has been established as a synonym for modular scaffolds in the market. The Allround Scaffolding offers unsurpassed versatility to be use 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.
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 Allround
A gas flare, alternatively known as a flare stack, is a gas combustion device used in industrial plants such as petroleum refineries, chemical plants, natural gas processing plants as well as at oil or gas production sites having oil wells, gas wells, offshore oil and gas rigs and landfills. In industrial plants, flare stacks are primarily used for burning off flammable gas released by pressure relief valves during unplanned over-pressuring of plant equipment.
Gas flaring at many oil and gas production sites protects against the dangers of over-pressuring industrial plant equipment. An example of the consequences of failure to flare escaping gas was evident in the Bhopal disaster when a flare tower was broken and couldn't flare escaping Methyl isocyanate gas (The gas had been in an over pressured tank and released by a Safety valve), which resulted in its release into the surrounding area.
The Multiple Structured with different sizes operated by Chemical and Fertilizer is currently being refurbished, and corrosion prevention experts have to treat the entire Structure time to time. Safe access to all location of main building is assured with the use of a modular scaffolding system. By using Allround Scaffold is the only possibility to complete maintenance on time with full safety as per requirement.
Chemical Plant requires painting of complete flare stack and associated derrick structure on apply–supply basis (services along with material Supply). This includes complete scaffolding erection and dismantling (by M/s Layher providing all necessary material) to execute painting job of flare stack Ammonia and around associated derrick structure. Basis of erection services is along with scaffolding material Supply.
Flare stacks Riser of diameter 36 inch for connection between the Knock out Drum at the base and Flare seal at the top. The approximate height of the riser is 68 metres and is made of material SA516 gr. 60/70, SA350LF2. Derric & Structure material IS-226.
Painting specifications for painting and working procedure of scaffolding erection and dismantling are as per Company standards. There shall be three levels of safety viz Full body harness Safety belt, fall arrestor (one on one rope) and safety net. Make of rope should be of M/s Garware, Unicare, and Karam with load test certificate from competent authority.
The shifting of scaffolding material up to working height is to be done with tested rope and pulley, and care to be taken that no one is in the vicinity of the working area.
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 dictated 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 is ensure the optimum conditions for effectively enclosing the Circular and rectangular structure with safe and minimal time required to construct the scaffolding. Allround Scaffolding was easily adapted to follow the contour shape of the structure without difficulty to access.
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 Allround scaffolding top-quality products are extremely long-lived.
Several work levels were required plus a lift going up 66 metres were required to be integrated into the scaffolding.
The challenge set by this particular job was to follow as precisely as possible due to inclined angles. This was possible due to the extensive capability of parts Layher Allround are able to offer.
Due to restriction of open space possibilities of access Aluminium deck with integrated ladder is only possibilities. Internal accesses can be built into the scaffolding with the access decks. These decks conform to the requirements of DIN EN 12811 and are available with a separate or an integrated access ladder for internal access.
The stability of a structure shall be checked both with and without the wind loads, as there may be reversal of the forces under wind besides a reduced factor of safety considered with the wind loads as per IS 875 (Part 3). Assembly, alteration and dismantling of the Layher Allround Scaffolding involves a risk of falls. Perform scaffolding assembly work in such a way that the risk of falls is avoided as far as possible and that the residual risk is minimized.
The top lift of the scaffold at the top of the structure called for Layher’s expertise. Following the increasingly safe scaffolding with proper Access at all locations, Layher’s Technical Bureau designed a series of connected to the topmost existing structure. Allround standards, which made them converge in tension-resistant form. The scaffolders then placed the structure on the highest point of the Building using Allround standards and applicable accessories.
Construction of Scaffolding to make approach for all required locations was major challenge during the work due to unsymmetrical structure, but it is easy when we consider Allround Scaffolding Systems.
Layher new Lightweight scaffolding is result of a major, multi-year R & D project with as clearly defined objective: to make scaffolding easier, safe and above all more cost effective for customer.
Civil Engineering & Construction Review is a leading monthly news journal, launched in 1988, at New Delhi, India by Trend-Set Engineers Pvt. Ltd. Its dedication to reader satisfaction and also towards fulfilling the ever - growing needs of the construction profession, makes CE&CR the first choice of all those connected with the construction industry.