Layher Scaffolding Systems in India

Layher Allround: The Ideal Bridging System

Mithilesh Kumar
Mithilesh Kumar
Director
Layher Scaffolding Systems Pvt. Ltd.
For more than 60 years, the Layher name has been synonymous worldwide with high-quality and practically tested scaffolding systems. The company has its presence worldwide with more than 30 sales subsidiaries. Its products are used for building and construction, in all kinds of industries like chemical plants, power plants, shipyards and offshore. Due to its innovative products, superior technical solutions and absolute customer orientated service package, Layher has become the standard in scaffolding systems worldwide.

The Allround bridging systems is the ideal complements to Layher Allround equipment with just few additional components, the load-bearing capacity of the proven Allround systems can be increased enough to create special structures like, wide- span footbridges or support structure for heavy loads.

The Allround Bridging system is a modular truss system that can be adapted to the respective application. The posts of the Allround Bridging Systems have wedge heads welded to the side, to which standards of the Allround equipment can be fastened. As a result, the Allround Bridging Systems can be combined with Allround equipment, offering a wide range of possible uses. A complete integration into an Allround Scaffolding structure (e.g. to transfer high loads or for bridging of wide spans) is also possible. The individual components of the Layher Allround Bridging System are connected in a time-saving way using bolts of diameter 30 mm. The connection to the Allround equipment is made using the proven Allround wedge head connection.

Layher
Innovative supplementary component: even unsupported bridging structures with a span of up to 30 meters can be completed, or high loads can be supported due to the modular All-round bridging system from Layher.

A standard Layher bridge structure mainly comprises two loads transferring Allround Bridging Systems which are arranged parallel to one another at a defined distance, depending on the required bridge width. A stable bridge supporting structure is obtained with an internal Allround scaffolding structure fastened between the two Allround Bridging Systems, The stiffening in the transverse direction and hence the stabilization of the Allround Bridging Systems is achieved with horizontally arranged bracing in the Allround structure. The bridge decking and the guard rails are fastened to the internal Allround scaffolding structure. The entire bridge structure – both bridging units in combination with internal Allround Scaffolding – is finally supported at the bridge ends. The support can for example be on individual Layher heavy-duty supports integrated into a separate stairway access. In some cases, it is also possible to support the end posts of the bridge directly on existing foundations, beams or walls.

With the new development "Allround bridging system," Layher offers the optimal solution for the construction of a more than hundred metres long pedestrian crossing with free spanned bridge elements of 31 metres.

Application of Allround Bridging Systems

Allround bridging system with 30 m Span, partially cladded with lightweight cassette roof and Protect system.

Layher Image
Layher Allround Bridging System as temporary pedestrian bridge at Seedorf
In the context of modernizing the Swiss motorway, the lanes and civil engineering structures such as bridges, underpasses or passages will be renovated extensively in three phases. This also includes an overpass near Seedorf at the Urner Lake. This overpass does not only cross the so-called Gotthard Route, one of the most important north-south transport axes in Europe, but also the fourth-biggest river of Switzerland. Side by side, this duo meanders through the Swiss panorama from the Gotthard down to Lake Lucerne. Only there, their paths go separate ways. The transit route leads to Basel, while the 164 kilometres long river Reuss flows into the Aare near Windisch.

As a replacement for the closed bridge, the Federal Office for Streets in Bern (ASTRA) ordered the construction of a temporary pedestrian crossing which was to cross the motorway and the river parallel to the existing bridge. Tasks of this nature generally require project-oriented and therefore expensive special constructions. With the innovation from Layher, scaffolders can now offer this service much more efficiently with only a few additional components to the Allround system. After a successful appearance in Davos at the World Economic Forum, the use of the Allround bridging system for this project with supporting spans of up to 31 metres was also the optimal solution.

Layher Image
Layher Allround Scaffold as pedestrian bridge
In order to derange traffic on this highly frequented route as little as possible, the construction was pre-assembled on the ground. To bridge road and river, provisions were made for two sections of 31 metres each. To compensate deflexion, these were constructed due to the lengthwise adjustable diagonal brace with a slight cant. Within only five minutes, the builders in charge were able to place the two parts of the bridge onto the supports by means of a crane: during the afternoon over the river, and at night – during a short complete closure – over the motorway. One day, one night – and the bridge is completed for duration of approximately four to six months. Accesses as well as the middle section were, present owns to full compatibility, constructed with the Allround scaffolding.

NBMCW March 2014

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