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“Bären” Hotel new Pearl for the Black Forest's Tourist Sector

STEINACH/GERMANY, March 13, 2014 - When forming the shell of the new hotel building and extension, the building contractors running the project tested Paschal's Logo.3 wall formwork system measuring 270 x 340cm.

The “Bären” hotel is being rebuilt and extended following a major fire in December 2011. Timber and glass play a role architecturally, in visual terms. Under the ground and behind the scenes, reinforced concrete shaped with Paschal formwork is the central material ensuring the hotel stays in operation for a long time to come.

the "Bären" hotel in the Black Forest was rebuilt and extended

The hotel is due to re-open in summer 2014. | photo: sporer plus architectural practice

The groundbreaking ceremony planned for November 2012 had to be put off until Feb-ruary 2013 due to the extensive appraisal, negotiations with the insurance company and the building permit process.

At the time, the construction schedule foresaw the extended hotel with more staff re-opening as early as December 2013. At present the event is planned for summer 2014.
The new “Bären” will be made up of two equal parts: the “Waldflügel” wing and the new building. When the hotel has been completed it will feature some 100 beds in rooms of up to 35 square metres each on three floors in each building, as well as suites measur-ing 48 square metres each. The amenities will be rounded off by a lounge with a res-taurant, the hotel restaurant itself, meeting rooms, a spacious lobby, a comfortably ap-pointed spa area and a wine cellar.

Architecturally, the facades will be given slate wall shingles to create a unified, region-ally typical appearance. Glass and timber will also play an important role in the building's look, though concrete will be almost one hundred per cent responsible for the load-bearing properties of the structure as a whole.

A Logo.3 element used for rebuilding the "Bären" Hotel in the Black Forest

Logo.3 element measuring 2.70m / 3.40m to form the basement walls The few ties required are clearly visible, as are the wedge clamps connecting the elements, weighing only 1.8kg each. | photo: Paschal

Hillside Situation and Level II seismic Hazard Zone

When planning the structural engineering, the level II seismic hazard zone had to be taken into account, as reflected in both reinforcement and component size. Just for the building foundations, the construction record lists 35 tonnes of steel reinforcement for the pad and strip footings.

The seismic hazard zone and situation on a hillside meant that the hotel had to be built almost 100 per cent from reinforced concrete. For this reason, the entire shell, made up of the basement, ground floor, four upper storeys and attic, was created for the most part using C25/30-quality reinforced concrete.
The load-bearing concrete walls are 24 to 40 cm thick. Some 1,200 cubic metres of concrete were brought into shape, the tensile force created being borne by almost 260 tonnes of reinforcement steel.

Site Preparation, Work Provisions and Formwork Planning

To prepare for the work and plan the formwork, the medium-sized owner-run construc-tion company carrying out the first fix, Bauunternehmen Anton Himmelsbach, used the Paschal-Plan light automated formwork planning software.

Paschal-Plan light was developed as a universal software tool to actively assist building contractors in planning the construction site and formwork and organising their work. Bauunternehmen Himmelsbach used the current Version 10.0, consisting of two mod-ules. The "Design" module is fully automated, enabling contractors to plan all the form-work, while the "Warehouse" module allows them to organise materials in their yard and onsite.

construction site of the "Bären" Hotel in the Black Forest

The constricted building site with the street in front and the hill at the rear, with the surviving buildings to the left, meant that work had to be prepared and the materials planned perfectly. When it came to formwork planning, PASCHAL with their hired materials made a reliable partner for the building con-tractor. | photo: Paschal

From Foundations to Gable

For the last 17 years, Bauunternehmen Anton Himmelsbach have chosen Paschal Modular/GE Universal Formwork, here again successfully used as the formwork for the foundations, columns and beams.
The Logo.3 formwork system has also been a regular fixture for many years.
On this project, due to the height of the storeys, the contractor tried out the Logo.3 formwork system in the 2.70m x 3.40m version, hiring 300 square metres in that size then combining it with their existing stock.

For the basement wall formwork the size was used in an upright position, i.e. with a height of 3.40m. On the ground floor, one upright element was combined with a hori-zontal element to form the entire height of the floor in one step.
To form the following four upper storeys the Logo.3 was laid on its side, employing its width of 2.70m.

The first fix was basically completed in December 2013. The new build and the design work to adapt the Waldflügel wing, which suffered slight damage in the fire, will cost several million euros, with Sauters investing a seven-figure sum in the modifications to the Waldflügel wing out of their own pocket.