Water tanks

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Alfa MODUL tanks are covered, underground watertight tanks with an outlet, used to retain rainwater for further use, such as watering, for technical purpose or without any use with a controlled outlet option.

Alfa MODUL tanks are covered, underground watertight tanks with an outlet, used to retain rainwater for further use, such as watering, for technical purpose or without any use with a controlled outlet option. Alfa MODUL tanks serve to decrease the water run-off from an area. Water run-off control can be done either using a run-off controller or a pump. MODUL tanks can also be used to store fire water or as accumulation tanks for sewage water. Reinforced concrete tanks are made of C 30/37 Class concrete. The advantage of these tanks is that their entire volume can be modulated and the end is closed with front-ends on both sides. The individual segments are connected using a rubber gasket with screw connections. Using screw connections, the ceiling slabs are screwed to the tank so that the slab covers the individual segment joints. Once assembled, the tank gaps are sealed with polyurethane filler, thus achieving an enhanced joint tightness. Unused screw holes are covered with plastic lids that are sealed over with polyurethane filler. The tank can consist of a single set or, if larger retention volume is needed, can have several interconnected sets. The individual sets are interconnected with PVC pipes via transitions and rubber gaskets that are inbuilt into the tanks during manufacture. Such transitions are completely watertight and their assembly is very easy and fast.

For economic rainwater management, we offer a large-volume rainwater retention tanks that can be used as the following types of tanks:

  • retention
  • detention
  • accumulation

Such an extraordinary construction method of underground rainwater tanks is made using a lost ceiling boarding.

Main system advantages:

  • lower concrete and reinforcement consumption = cost saving by investor
  • shorter construction time = due to a system of shortened ceiling boarding
  • high loadability of the structure = utilisation under parking lots, roads, storage and grass areas
  • variable tank shape and size = adaptation to structure requirements
  • tank entrance = for inspection and cleaning

System Characteristics

  1. Install reinforced concrete basin made of water construction concrete onto the foundation concrete. It is at this stage that transitions for inlet/outlet, area for pumping technology, flow rate controllers, partition walls and other technical requirements as per project are carried out.
  2. Put 58x58 cm foundation stabilising feet on the tank bottom so that they interlock and create a precise span between the support pillars. This is also important during concrete work on ceiling and pillars so that they do not turn away from their axis, this decreasing the system loading ability.
  3. Insert 125cm diameter PVC pillars into the prepared stabilisation feet. Max. pillar length (tank height) is determined by the backfill composition above the tank and by the static calculation for tank loading ability.
  4. Insert 58x58x15 cm coffers onto PVC pillars and let them interlock using lateral channels.
  5. Coffers are made in such a way that, when concreting the ceiling, the concrete will get into the pillars due to a vibrator, creating a structure with high loading ability.

More informations can be find in the catalogue on the page 22