Description of execution
The tank with a total capacity of approx. 205 m³ was designed taking into account the difficult environmental conditions resulting from the foundation in an area with a high level of groundwater. The whole was covered with a 1.4 m layer of topsoil, which additionally emphasises the durability and tightness of the materials used. The structure, which is 14.04 m long, 6.0 m wide and 3.36 m high, consists of five prefabricated elements: three intermediate and two outer ones, including covers and inspection manholes. The heaviest of the prefabricated elements weighs 23.9 tonnes.
The elements were made of C45/55 concrete and belong to exposure classes XC2, XC4, XD3 and XA1. These parameters result from the exposure of concrete to: corrosion caused by carbonation occurring in variable humidity conditions, corrosion caused by chlorides in a wet environment, as well as corrosion caused by aggressive chemical agents.
The use of concrete prefabricated elements significantly reduced the construction time – the prefabricated elements were delivered to the construction site ready for assembly, which reduced the time-consuming wet work. In addition, thanks to the quality control of production at the plant, we obtained repeatable elements, eliminating the risk of assembly errors. The prefabricated construction also ensures the necessary durability and tightness, which is crucial for retention tanks exposed to groundwater and high external loads.
