Cantara @Ara Damansara
(Additional SI Borehole for Optimisation of Pile Length Design)
(by Mr. Jeremy Lim, Sr. Project Manager) (2016 Apr-Jun)
This development project locates at Ara Damansara. The workscope consists of piling work (i.e. Bored piling for tower blocks while jack-in spun pile for podium), pilecap, retaining wall and some minor M&E work.
Prior to the commencement of physical works, additional 9 nos. of boreholes are carefully planned and sunk at this site in order to decipher the subsoil profile. These obtained parameters are of paramount importance for us to fine-tune & re-calibrate our alternative proposal with further optimisation. In short, the adopted bored pile sizes range 750mm to 2500mm dia. as foundation for heavy loading of 4 tower blocks while simpler jack-in spun pile (i.e. 500mm dia.) configuration is proposed at podium in view of lighter loading.
Based on soil investigation, this project job site has overlying of 10-15m subsoil with SPT “N” less than 15 and underlying granitic bedrock formation (RQD range 0% to 40%). All the proposed bored piles are socketed into the bedrock and the designs are validated with instrumented test pile. Whereas, the jack in pile are loaded with 2.2 times of working load which verified by maintain load test.
There are few most challenging issues during the construction period arise as below:
- Managing the 7 working boring rigs and preparing the working platform for jack-in machine concurrently;
- Handling the complaints from neighbouring residents which restricts our working hours;
- Tackling, cut & fill and trim the earthwork platform (i.e. approximately 30 + of different levels).
- Compliance to the client’s Safety & Heath regular internal audits and also SIRIM audit.
Despite the difficulties, this project has been completed successfully with deepest appreciation to my lovely yet dedicated project team (i.e. Weng, Hoe, Azmil, Samad, Halimi, Nazri, ‘iron lady’ – Nadia and not forgotten our safety officer Riduan & Badrol as well). Bravo !!!