Pile Load Test
Load tests are conducted on test piles to confirm design load calculations of actual piles. Traditionally, a pile load test is carried out using the Kentledge method where concrete blocks are stacked to build up the required test load. Rapid Load Test (RLT) is used as an alternative to static load test. It is faster, less-labour intensive and requires much less working space. It also enhances safety by minimizing risk of falling from height.
Jacked pilling is a method using concrete spun pile or Reinforced Concrete piles that are installed into the ground using a hydraulic jacking system. It is adopted as an alternative piling method at sites with suitable soil conditions. It offers advantages in terms of faster construction rate, better quality control, relatively lower noise and minimal vibration compared to bored piling or conventional driven piling.
Crack inducers are pre-installed to effectively render crack at the pile head. The starter bar shall be debonded from the concrete by suitable materials. Cracks will be formed at the level where the crack inducer was placed and the pile head can be removed by lifting it off without hacking work.
This method minimises noise pollution, dust pollution and increases overall productivity. The whole activity of pile removal with crack inducer only takes about 20 minutes.
Hydraulic Ring Static Pile Breaker
Hydraulic ring static pile breaker has also been implemented as an alternative to the crack inducer. The process of pile removal is up to ten times faster than conventional method of hacking. Similar to the crack inducer, this method minimises vibration, dust and noise pollution.
Spray painting reduces dependancy on skilled labour, and is less time consuming, as it is carried out via portable spraying equipment. This provision had been incorporated in HDB Building Specifications.
System formwork is modular, and so it is able to provide good level of evenness and hold in place during casting, without much propping. It is easier and safer to assemble and dismantle and thus provides better quality and productivity, compared to conventional metal/timber formwork.
BIM for Virtual Design & Construction
HDB’s use of Building Information Modelling (BIM) started in 2009, with a pilot for one of its in-house design projects. Recognising the immense potential offered by the technology to visualise the design virtually and foster greater collaboration between the different stakeholders of the project, HDB set up a BIM Workgroup to develop a BIM Roadmap. Some of the key initiatives under the Roadmap include the BIM mandate for all new development projects since 2013 and the launch of the Step-by-Step BIM Guide for HDB Projects in the same year to share best practices of BIM implementation for new public housing developments.
The HDB BIM Roadmap was rebranded as the HDB BIM Framework in 2014 and Virtual Design & Construction (VDC) methodology was introduced for selected new development projects in 2015. The methodology involves the systematic use of BIM models by consultants and contractors for the resolution of design and construction issues and for direct manufacturing of PBU and PPVC components. The HDB BIM Guide V2 which set out the core information requirements and quality standards of BIM models was also launched. Moving forward, HDB is looking into harnessing the rich information embedded in the BIM models across the entire built environment value chain from planning, design, construction and facility management to achieve Integrated Digital Delivery.
CCTVs cameras are used to monitor and supervise the construction progress on site. They are installed at height to give an overall view of the construction site, and enable real-time remote monitoring from an offsite office.
Biometric Tracking System
The Biometric Tracking System uses unique physical traits such as fingerprints to track the attendance of workers. It minimises paper work, reduces identification mistakes, and ensures only authorised personnel are allowed to access the site.
Usage of Mobile Devices and Applications
Inspection and supervision works with pen and paper in the construction industry has become a thing of the past in the construction industry. All the necessary information is stored on mobile devices such as tablets and phones, which faciliate real-time verification on compliance.
In order to help contractors move away from labour-intensive construction, HDB has specified the use of machineries to replace these works and improve productivity.