This new housing development by Bellway is located on a flood plain. Due to the flood risk, this meant the site levels needed to be raised by an average of one meter over the whole site to mitigate the risk.
Material and Cost Savings
As this site required engineered foundations, a significant amount of crush material would have needed to be imported to facilitate the piling. As this isn’t a cost-effective solution Bellway approached us for an alternative. We proposed our Housedeck system using our low track pressure midi piling rigs. This allowed the fill material to be changed to an engineered cohesive sub-soil, offering significant savings in material costs.
Using cohesive sub-soil would usually require a top layer of crushed fill to mitigating against surface degradation to support the piling rigs. However, due to utilising our midi rigs, we were able to use our Concrete Working Surface (CWS) instead, adding to the material cost savings.
Omitting Heave Precautions
There were several plots located inside the zone of influence of existing trees and in conjunction with the Site Investigation (SI) report it was thought there was a risk of future heave.
We carried out a detailed review of the SI report and due to the near-surface alluvial deposits and high water table, we did not believe the risk of future heave was significant. To omit heave precautions we corresponded directly with the warranty provider to gain prior approval before starting on site. This resulted in further cost savings as no heave mitigation was required.
“Abbey Pynford’s common sense approach has allowed us to rationalise our approach to foundations in complex ground conditions, saving both time and money on our projects.”
By using the Housedeck system, we greatly simplified what would have been a complex and expensive approach to the foundations. We look forward to working with Abbey Pynford in the future.
Andrew Crouch, Senior Project Manager, Engie
Abbey Pynford have been collaborative from the outset with design input and assistance with NHBC approvals. The cost-effectiveness of the Housedeck system has simplified the delivery and speed of foundations on our projects. We look forward to working with Abbey Pynford on future projects.
James Dupey, Managing Surveyor, Lovells
Hugely impressed with the Housedeck system, its best described as a quick, mess free build process culminating in a tidy end product.