The walls of the new
municipal technical centre in the French municipality of Herrlisheim were
formed using LOGO.3 from PASCHAL. The plus-energy building was put into
operation at the beginning of 2024.
The new technical centre in
the French municipality of Herrlisheim is being built to include a solar system
on the monopitch roof, not only to cover its own energy requirements, but also
to supply other public facilities. The construction company Léon used LOGO.3
wall formwork from PASCHAL to form the walls of different heights. PASCHAL's
circular trapezoidal girder formwork (TTR) was used for the 60 m3 capacity
cistern.
In terms of sustainability,
the municipality of Herrlisheim – approximately 30 km north of Strasbourg – has
ambitious plans; when the new technical centre goes into operation at the
beginning of 2024, the French municipality from the Upper Rhine region wants to
save energy costs and make a profit by operating a solar system. The Strasbourg
architecture firm N01 Architecture therefore designed the new municipal
technical centre on the outskirts of Herrlisheim as a plus-energy building with
a solar roof and a cistern to collect rainwater.
Technical and community
centre in one
The building covers an area
of almost 1,400 square metres, is 75.5 metres long and 18.5 metres wide and has
a large inner courtyard for the municipal construction vehicles. Inside the building
there is space for offices, storage rooms and workshops. The municipality's
technical services were previously spread across four locations, but the new
building will centralise them all and consolidate storage. The centre will not
only serve as a construction yard, but will also be open to the community as a
venue for events. Clubs will be able to use the premises free of charge and
there are plans to organise exhibitions. The earthworks started at the end of
2022, and the formwork operations took place from spring to August 2023. Here,
the contractor, Léon Sarl from Auenheim, Germany, relied on the
tried-and-tested formwork solutions from PASCHAL. The order size was
approximately 375,000 euros.
TTR: for perfect rounding
of the cistern
The literally sloping
architecture of the entire building was given a counterpoint with the
eye-catching round cistern. In addition to the solar roof, it lives up to the
municipality's claim of operating sustainably. The cistern with a capacity of
60 m3 is intended to enable the recovery of 700 m3 of rainwater per year and
save 1,750 euros in costs per year. The recovered water is sufficient to water
flowers and plants. For the formwork of the cistern, 78 square metres of
circular trapezoidal girder formwork with steel facing (TTR) were used, and the
3.5-metre-high cistern was constructed in two cycles. 'Our TTR circular
formwork is ideal for producing not only polygonal, but also precisely round
structures, as the panel elements can be very finely adjusted', emphasises
Alfred Schweitzer, who acted as a specialist consultant for this project.
Sloping roof – straight
joints
To install a solar system
on the roof, the architects designed a monopitch roof that slopes towards the
south. A total of 576 solar panels will then be installed on an area of around
1,100 m2, which will produce 230,000 kilowatt hours of electricity per year.
Once the company's own requirements are covered, surplus electricity will be
sold or used to supply other public buildings.
Around 372 square metres of
LOGO.3 wall formwork were used to construct the nine walls, which Léon had
rented from the head office in Steinach. One of the largest panel elements from
the PASCHAL portfolio was used. The height difference between the load-bearing
walls is around two metres. For this reason, two of the 340-cm-high panels were
placed on top of each other on the higher side, plus a 135-cm-high panel
element, to achieve a total shell height of 815 cm. On the lower side of the
wall, a 340-cm-high panel was combined with the 270-cm-high panel element.
'This is the art of our
formwork experts, designing the formwork plan in such a way that the workers
can work with the least effort but achieve the best result', explains Alfred
Schweitzer. The walls of the municipal technical centre were concreted in nine
cycles. Alfred Schweitzer explains further: 'This is where our wide range of
products pays off. The Léon employees were able to place shorter panels at the
top to create the sloping roof and therefore did not have to work so low down.
This makes their work easier when the wall thickness is only about 30 cm wide.'
The ingenious formwork plan
and its precise realisation mean that the concrete pattern results in a uniform
joint pattern – despite the sloping top edge. 'Planning and producing a sloping
surface like the exterior walls is a particular challenge – for the formwork
planners and for the company carrying out the work', emphasises Jan Skipka, Key
Account Manager International Business, adding: 'Thanks to the even
distribution of our panels, this has worked extremely well here. The joints are
symmetrical and at the same height throughout'. Yannick Jungmichel, site
manager at Léon in Auenheim, confirms: 'We are very satisfied with the concrete
finish and the even tensioning point pattern. This is why the exterior walls
with their exposed concrete look remain as they are. Only in some interior
areas will the walls be further clad'.
'Flying' work platforms
Léon attaches great
importance to a safe working environment for its employees. However, work
platforms should be set up with as little effort as possible. The decision was
therefore made to use the formwork solutions in combination with the
multi-functional working platform Multip . The scaffolding brackets can be easily
fitted to the panel elements when they are still on the ground. When moving the
panel elements, the 'scaffolding-formwork combination' is simply moved as a
whole by crane. 'The working platforms can be attached to the panel element in
just a few simple steps. Once this has been done, it saves us having to
dismantle and reassemble during concreting. This means we can erect the
formwork and dismantle it even faster with the help of the Multip', confirms
Yannick Jungmichel.
By implementing the
sophisticated formwork plan, it was possible to achieve a uniform concrete
appearance with an impressive symmetrical arrangement of joints and tie points.
