POLYCRETE® special shafts
Inlet or outlet, connecting, curved or drop level buildings, armature buildings for slide valves or metering stations, storm water overflow basins or small pump stations: We offer POLYCON® shaft buildings made of pre-fabricated polymer concrete elements for any large dimensions.
For these applications polymer concrete offers a number of convincing benefits for planning, erection and for the cost-efficiency of the sewer system buildings. Flat slabs can be joined to flexibly adapt the shaft shape and size to the local situation. This construction and the high material strength allow thinner walls and thus low weight. Our rationalised manufacturing technology ensure short delivery lead time even with individualised production for every project. The shafts allow the user to make best use of space for installing pumps and armatures. Our own installation staff can handle difficult building site conditions and assemble the products on site to quickly deliver a top quality solution.
POLYCRETE® pressure reduction shafts
Poor ventilation and the resulting anaerobic situation lead to hydrogen sulphide (H2S) formation in sewers. It is well known that such conditions mainly occur in long pressure-free sewers with little head, where the sewage stays for a longer time. The result is the much dreaded biogenic sulphuric acid corrosion on surfaces above the water level. Where pressurised sewers flow into pressure-free sewers the hydrogen sulphide dissolved in the sewage is released in large quantities. This is where corrosion management can become a real problem. POLYCRETE® shafts made of corrosion-resistant polymer concrete withstand the attack. So they are increasingly installed as pressure reduction shafts. Since the downstream sections of the pressure-free sewer also suffer from increased exposure we recommend the use of the acid-resistant polymer concrete as the material for these sections as well.
POLYCRETE® pump shafts
A similar situation prevails in pump shafts. Entry of sewage from pressure-free sewers and its long staying time cause increased corrosion. Pump shafts are mostly very deep (creating additional collection volume below the feed sewer). Therefore it is often necessary to use expensive ground water management systems for installing pump shafts. Delivery of a one-part jointless shaft to the building site is worth cash money in that case. In addition it eliminates the risk of leaks at connecting joints. Of course POLYCRETE® pump shafts are also suitable for installation using the Caisson method. In this case a pre-fabricated polymer concrete shaft base with a sediment-free collection space ensures a completely corrosion-protected structure.
