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Weeks of manual work avoided

The Schwamborn WDS 530 bush hammers walls in the Carmen Würth Forum, achieving an impressive surface quality.

The Carmen Würth Forum was designed by the British architect David Chipperfield. Two retaining walls of textured in-situ concrete frame a spacious forecourt in front of the main entrance to the building. The new WDS 530 wall and ceiling grinder from Schwamborn was the machine of choice for bush hammering of the 2,000 m² walls.

2,000 m² of wall was bush hammered in a single week with the Schwamborn WDS 530 - transforming the architect’s vision into an efficient and visually outstanding solution

The Carmen Würth Forum was created on a site of 170,000 m² in Künzelsau with the construction of a multifunctional venue and a chamber music hall in the direct vicinity of the company Adolf Würth GmbH. The key challenge the award-winning British architect faced was to integrate the building as harmoniously as possible in the Hohenlohe landscape. This was achieved with especial success through the in-situ concrete retaining walls and the wave-like appearance of the walls inspired by the gently undulating hills.

In this case, the in-situ concrete design involves two separate colour tones of concrete being introduced in layers into the formwork. The formwork is then stripped away after the material sets. The walls created are expansive units, with the final look being achieved through bush hammering. Bush hammering is a technique employed to texture surfaces reminiscent of the work of stone masons. It involves the creation of a uniformly pockmarked surface on exposed concrete and, up until now, usually involved manual work with a bush hammer to achieve this effect. “Using our new grinder and the bush hammering rollers specially designed for it, we succeeded in bush hammering the large wall in the Würth Forum in only one week”, says Siegmund Griesheimer, Head of Application Technology at Schwamborn, explaining the advantages involved. “This would normally involve weeks of manual labour with complicated scaffolding, resulting in a finish that is not as uniform as that achieved here”.

A global first, the WDS 530 was a finalist in the Bauma Innovation Award competition and, in addition, received an award in the prize competition of the same name in the district of Göppingen. Heavy demolition, renovation and design work which previously had to be realised by hand can now be mastered mechanically with this Schwamborn development using professional grinding technology and achieving phenomenal surface results.
The demands associated with demolition, renovation and design are continuously increasing, both in ergonomic and efficiency terms. Schwamborn develops innovative, user-oriented solutions to tackle these challenges – through engineering Made in Germany and its own research and development division.

Efficient and ergonomic

The innovative Swabian machine manufacturer has incorporated over 50 years of experience in professional grinding technology for walls and ceilings in the WDS 530. The WDS 530 has a hydraulic drive which can be operated by remote control. For the first time, this enables efficient grinding and structuring of extensive wall and ceiling areas, achieving an outstanding surface finish. Moreover, it considerably simplifies work and relieves the stress associated with the previous technology which either required manual application or was not nearly as careful with the building fabric.

Uniformly high contact pressure

“Having been designed for working with BROKK demolition robots (at a working height of up to 9m), this machine enables the achievement of uniformly high contact pressure on walls and ceilings, with Cardan technology ensuring that the grinding head lies flat at all times on the surface. The machine can be fitted with a variety of tools (diamonds, PCDs, bush hammering tools), depending on the application”, relates Eckart Schwamborn, CEO of the company in the third family generation.

This makes the WDS 530 ideal for a variety of application areas, an example being the efficient, rapid, thorough and safe removal of coatings – including those containing harmful substances such as asbestos. Paint, plaster or tile adhesive applied over a broad area can now be efficiently removed. Another area of use is in subsurface preparation during renovation work and the creation of designer or natural stone floors through grinding with diamond tools.

New architectural horizons

New creative and, now, efficient design options are opened up in architecture and wall and ceiling construction. Design with concrete can, similar to floor construction, now be realised over a broad area in numerous different ways through a variety of techniques, achieving highly polished to glossy surfaces or a roughened finish with bush hammering tools. Walls can be ground with different grit types to achieve extraordinary design results.