near Heilbronn rehabilitated
At the rehabilitation of a two-chamber
elevated tank, in Untergruppenbach near Heilbronn, the administration
unit 'Schozach-Wasserversorgungsgruppe' backed a high-quality thick
coating with only one material. The first chamber is once again
in operation and the remaining works shall be finished in July 2012.
The main elevated tank of the administration unit 'Schozach-Wasserversorgungsgruppe',
is situated in Untergruppenbach near Stettenfels Castle and has
a total volume of 2,000 m3. From here, the districts Untergruppenbach
and Obergruppenbach, Unterrheinriet and Oberrheinriet, Wüstenhausen,
Auenstein, Helfenberg and Abstetter Hof as well as the whole municipality
Abstatt is furnished with drinking water. In addition to its two
round chambers having a diameter of 18 m each and a height of four
meters each, the elevated tank has a mixing chamber in which the
water coming from Lake Constance and own water are brought together.
The right main chamber dates from 1972, the left chamber was already
built in 1959.
Round shows softened thin coating
In 2010, all supply plants of the administration
unit were examined by the engineering office Raith Plack von Scholley
on its requirement of repair. On the basis of this visual inspection
and an expert opinion on the concrete, the fundamental repair of
the elevated tank was determined during the meeting of the Association
under the chairmanship of the mayor of Untergruppenbach, Joachim
Originally, the tank walls were equipped with a mineral thin coating,
which proved to be eroded and soft. In addition, corroded reinforcing
steel came to light. Besides, the concrete cover was no longer up
to the required standard and will be raised on all sides by three
centimetres in the course of the rehabilitation. The existing plant
and the process equipment will be rehabilitated as well.
with mineral mortar
To get permanent surfaces in the drinking water tank cement-bound
mortar is normally used. The quality of an internal coating depends
decisively on the material and its meticulous processing. It is
important to get an undamaged surface without penetrating pores.
In addition, the film thickness should be uniform and show a surface
which is as smooth and level as possible, so that soiling can deposit
hardly on the surface and cleaning is easier.
Universally applicable material
With the top 300, an especially high-yielding
shotcrete mortar came onto the market in 2009. It meets both the
hygienic requirements in accordance with the DVGW worksheets W 270
and W 347 and the technical requirements on building materials determined
in worksheet W 300/1. A handy peculiarity of the material is that
the mortar can be used universally on tank walls, tank ceilings
and tank bottoms. Even as a final coarse spray coating it leads
to an optically and functionally convincing surface. That simplifies
the material planning and prevents confusion on the construction
site. Ralph Weber, responsible for the field drinking water tanks
at epasit, amends: "The low modulus of elasticity and the good
setting of the material guarantee the quick return to service of
the water tank".
Complex rehabilitation and
In Untergruppenbach, the new wet sprayed coating
applied as a thick coating has been planned as follows: ceiling
30 mm coarse spray, walls 30 mm smoothed, bottom 30 mm smoothed.
After having removed the defective thin coating, the corroded reinforcing
steel has firstly being smoothed. Then, the masons from the company
Bauschutz from Asperg applied the mineral thick coating with a film
thickness of about twice 15 mm. At the moment, the second chamber
is rehabilitated analogously. All in all, around 100 tons of mortar
have been used for the walls, ceilings, and bottoms of the three
chambers. The rehabilitation of the first chamber, which took place
already at the beginning of 2012, resulted to be particularly complex,
because during the works the whole water supply had to be carried
out via the left chamber and provisional arrangements for the pipe
cellar had to be set up. The existing pipe cellar will also be rehabilitated
and in this connection all pipes and valves will be renewed.
Water supply guaranteed
The engineer responsible for the supervision
of works, Richard Raith from IRPS GbR, Stuttgart, explaines the
material requests put out to tender: "We attach importance
to a high-quality thick coating with a relatively low porosity".
In the meantime, the rehabilitated chamber is in operation again
and both the second chamber and the mixing tank can presently be
rehabilitated in parallel. In July 2012, all jobs should be finished
and then the completely renewed tank will be in normal operation
epasit: Solutions for building materials
from a single source.
For more than 50 years, the epasit GmbH develops
and produces special building materials for rehabilitation, renovation
and modernization. The product range comprises, among other things,
the waterproofing of buildings, the rehabilitation of monuments
and old buildings as well as the rehabilitation of damages caused
by mould and moisture. Drinking water tanks or swimming pools, too,
are rehabilitated with products from epasit. With sought after inventions
for building protection and building rehabilitation, the family
company distinguishes itself as a think tank. In addition to thousandfold
proved standard products, epasit develops individual solution for
epasit GmbH Spezialbaustoffe
Sandweg 12 - 14, D-72119 Ammerbuch-Altingen,
Tel (+49) 0 7032 2015-0, Fax (+49) 0 7032 2015-21
Gymnasium zu Bratislava
Burg zu Bratislava
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a personal contact?
Phone +49 (0)7032
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If you have further questions regarding this object or a similar
problem, please contact us.
+ 49(0)7345 - 22 333
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