2. Structure 2.2 Foundation
The subsurface soil on the site consists of Alluvium deposits. These consist of clay, silt, sand and gravel. This type of plain is within a flood zone and is periodically flooded by the River, therefore deep, stable foundations are recommended. The building also consists of 5 storeys, therefore a deep foundation is required to carry the large loading requirements. A bored pile foundation system called the Continuous Flight Auger (CFA) will be used due to the congested Urban location of the site, reducing the amount of noise and vibration. CFA consists of using insitu concrete. Firstly a bored pile machine drills into the ground. . Once the hole is drilled, concrete is poured into the hole. Lastly, reinforcement cages are lowered into the wet concrete. This technique may take longer than using precast piles, however it is very much quieter than drilling in precast piles. Noise reduction will have to take precedence over time due to the central location of the site. The piles are capped with a shallow ground beam which ties the piles together to form a single structural system that can be used as a base to build from.
24 | Technical Report
Fig.1. Image provided by Junttan Pile Specialists
Philip Win | 4236190
