Special-purpose constructions

Outstanding constructions

Special-purpose constructions

Outstanding constructions

Special-purpose constructions from glued laminated timber

Stunning architecture

No two projects at our company are the same. We have been realising plants, homes, stables, churches, offices, and shopping centres for decades, but each and every project always turns out to be a highly individual building tailored to the specific place, customer, or building contractor.

But some challenges presented to us were truly stunning. Some of our customers have quite exceptional ideas they want to see come true. If you are looking for something truly unique for your company, your community, or tourist region – timber construction can offer that special little something you might want.

Highly specialised requirements for research facilities often also require special solutions that we develop together with our customers and plan out as a timber construction.

And we really love turning stunning architectural ideas into exceptional timber structures within the framework of our design-and-build orders. Our structural design planners and engineers contribute their expert knowledge and support the planning process as project partners, if desired.

The Pyramidenkogel viewing tower

Observation tower in Keutschach am See, Austria

The wooden viewing tower rises almost 100 m high into the sky. The tower was planned by the Klaura, Kaden + Partner architectural office from Klagenfurt, Austria, and the Lackner + Raml structural design office from Villach, Austria. The tower consist of 16 massive, elliptical wooden pillars winding their way up into the sky in a spiral shape.

Rubner Holzbau at Ober-Grafendorf produced roughly 500 m³ of glued laminated timber, 1,000 m² of cross-laminated timber, and 300 tons of steel (in cooperation with the Zeman company) for the tower, and delivered the construction elements to the construction site right on schedule and in a just-in-time fashion. Their own staff was responsible for assembly. The high level of prefabrication at Rubner Holzbau production allowed for quick execution and, consequentially, improved profitability.

The tower structure comprises 10 levels, each 6.40 m high, and features two outside viewing platforms with a height of 3.20 m each. The overall structure consists of 16 glued laminated timber posts, reinforced by 10 elliptical rings and 80 diagonal struts. Visitors can either climb the stairs or take the elevator up to a height of 60 metres, where they find the “Skybox” with its panorama windows. The “Skybox” can also be used for temporary events. From the observation decks, visitors enjoy a 360-degree view. Those who love a little thrill can race down Europe’s longest slide, bringing visitors back down to the ground from a height of 50 meters.

KA300 Festival Pavilion

Complex bar-profile structure from wood and steel

A flying, sculpture-like structure formed the centrepiece of the Karlsruhe Summer Festival held on the occasion of the city’s 300th anniversary: The architectural design of the pavilion was the work of the Berlin Architects J. Mayer H. and Partner. Rubner Holzbau acted as general contractor and constructed the building including all related work of other trades such as rails, staircases, and parts of the interior decoration. Our scope of services included the structural design, execution and shop planning, as well as production, delivery, and assembly.

To ensure short construction times and on-schedule completion at the listed Schlosspark garden, Rubner joined and varnished all timber components to make them ready for assembly and delivered them to the construction site. After five months of construction time, timber construction work was completed. After the celebrations, which took place from 17 June to 27 September 2015, Rubner disassembled the temporary structure, and the material was repurposed.
 

The event pavilion covered a surface area of 52 x 27 m and was up to 16.4 m high, featuring a usable area of approx. 1,000 m². Ground floor capacity including stage, cafeteria, and information centre amounted to between 300 and 600 visitors. The 5.20-metre-high ceilings highlighted the ample and open character of the construction. In addition to its ground-floor facilities, the pavilion featured an exhibition level and two observation decks. The total volume sheltered from the weather (some of it protected by special moveable membranes) was about 2,800 m³; the overall envelope geometry of the cantilever bar construction amounted to 12,700 m³.
 

J.Mayer.H, Pavillon im Schlossgarten Karlsruhe, 300. Stadtgeburstag

Non-reflective structures

No nails, screws, or steel components

The Technical Center of the German Armed Forces (WTD 52) in Oberjettenberg, Bavaria, needed a unique detection building. The requirements: a 75 x 25 x 9 m timber construction that minimises interference from the outside and still creates conditions like in the open. As a consequence, the structure was designed to be largely metal-free to prevent any interference with tests on the part of reflections from the surrounding area.

Due to the designated use of the building, the overall construction had to be made of materials and components that were free of metal, non-magnetisable, and non-conducting. The contractor had each material tested for its magnetic susceptibility. For us, this meant designing a timber construction completely without steel nails, screws, or other steel components. For that reason, all components were joined using tight fits, oak nails, and glue bonds. To secure the construction, wood nails and artificial resin/laminated wood bars were used.

Glued laminated wood supports were mounted on a bucket foundation made from glass fibre-reinforced concrete. Along the full length of the building, ridged-roof single-span girders were placed on top of the supports. The trusses have sloped bottom chords and are 28 cm wide, about 2.30 m hight at the ridge and made from Class 28 h glued laminated timber. A total of 500 m³ of glued laminated timber and approximately 2,400 m² of roof panels made from 550 m³ of laminated veneer timber were used for the construction.

The large-sized roof elements (2.5 x 16.0 m) are fully insulated box girders from laminated veneer timber. The bonding method was screw press glueing, and the screws used were removed from the elements once the materials had bonded. The glulam ridged-roof trusses were reinforced with veneer laminated timber panels on both sides. In accordance with the applicable standards, screws must be positioned at a distance of 12 x 12 cm. As a result, approx. 3,600 screws had to be correctly spaced, positioned, driven in, and later removed on each side of the truss to allow for screw press glueing. Thanks to the metal-free construction, radar reflections could be reduced to a minimum