12.3.2015

LifeCycle Tower One

The LCT ONE (LifeCycle Tower ONE) is a pioneer construction in many respects. The project, which is currently in the realization phase, is the first eight-floor wooden building in Austria. It is for the first time that an almost high-rise building will be made in wood construction.

Furthermore, it is the prototype for the prefabricated wooden building developed for the research project “LifeCycle Tower”. The aim of the project is to verify the feasibility of the construction system and to declare its functional efficiency under real terms of use. Because this construction system should achieve international marketability, this pilot project is a central building block for testing and marketing.

The building consists of a reinforced staircase core bordering one-way to the office space. Contrary to the proposal in the previous LCT research project to build the staircase core in wood as well, here it is built in site-mixed concrete. This was the result of an intensive examination of the statutory provisions of fire prevention, which shows that it is currently not possible to make the core out of combustible material.

With the certification (according to DIN EN 13501) of the fire resistance REI 90 of the timber joint hybrid ceiling, an important condition of the fire prevention authorities was fulfilled and an important step towards realization was taken. For this purpose, several timber joint elements of 2.7 meters – corresponding to a facade grill – multiplied by 8.1 meters – corresponding to the potential depth of space – were subject to a fire test at the company Pavus in Czech Republic.

The timber-concrete joint ribbed ceiling is the real key for building upwards, because it makes it possible to separate the corresponding floors consequently by a non-combustible cover. The wooden beams are inlaid into a steel formwork of 8.1 x 2.7 meters; the distances in between are formed and concreted using a grouting technique. Thanks to the high grade of pre-fabrication, the building cycle becomes much simpler. The ceiling elements can be made industrially in a more precise manner, there are no curing times on the building lot and for the laying of a ceiling element the workmen indicate just 5 minutes.

The connection between concrete and laminated timber construction is not made via complicated binders, but rather with screws and shear grooves. A lintel beam of concrete considerably contributes statically to the distribution of the enormous forces from the facade bearings. The cross-grained wood of the double bearings stands directly on the concrete; the connecting arbor is grouted to the pre-fabricated segment on the construction site. This lintel beam facilitates the necessary separation of the construction in terms of fire protection for every floor, also on the bearing level, and also makes discharge from the ceiling into the bearing without charging a timber work element across the fibre. Following the spread of the forces, the bearings are tailored according to the effective statical requirements.

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