CPC Civils were successfully awarded the Hindsford contract in 2012 and completed works in 2013. The Hinsford Project was a major Flooding Alleviation Scheme to install a 361m3 attenuation tank underneath a public park. The tank had been pre-constructed by Carlow Precast and designed to a storm water system specification.
The public park had an invert level of approximately 5 meters below the finished ground level. CPC Civils designed and installed temporary works at the site, which included a cantilever sheet pile wall on the East side of the tank. The wall was installed to the East side due to the location of a private dwelling situated within 9 meters of the excavation site. Due to the close proximity of the house, the piles were pre-augured to minimise any vibration. Furthermore, crack monitors were placed on surrounding housing and monitored to ensure that no movement occurred during the programme.
The tank itself was installed using a 45T Crawler Crane, in precast sections onto a concrete base. Once these sections were interlocked the tank was sealed using base and wall concrete pours. Following this, a full internal benching and dry weather flow system was installed. Finally, a pre-stressed roof was constructed and installed at the site.