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While GEOSS looks at the planet, local practitioners like those following (Singapore) or the Geotechnical Engineering Office (Hong Kong) look at the borehole. Their guidelines focus on the practical "how-to" of construction: Design and Installation Standards
To ensure that bored or CFA piles do not suffer from internal defects like voids, soil inclusions, or necking, several non-destructive testing (NDT) methods are deployed: This public link is valid for 7 days
For bored piles, the base of the hole must be entirely free of loose debris (sludge) before concrete placement. Local guidelines define allowable sediment thickness, often strictly capping it at less than 50mm for end-bearing piles. Concreting via Tremie Pipe
For each risk category, Annex B of Circular 2024 stipulates corresponding , including site investigation intensity, testing protocols, construction monitoring, and documentation standards. Can’t copy the link right now
Highly favored in soft clays and silts for providing a continuous profile of tip resistance and pore water pressure.
Applying a global Factor of Safety between 2.0 and 3.0. Their guidelines focus on the practical "how-to" of
Conducting sufficient boreholes to map the variability of the soil strata. In-Situ Testing: Utilizing specialized tests such as:
One of the most critical aspects of local bored piling is verifying when a pile has officially entered competent bedrock. To eliminate subjective visual classifications by site teams, joint GeoSS/BCA guidelines mandate quantitative verification via :
Guidelines typically require boreholes every 15 to 30 meters for high-rise structures.
In driven piling, seismic monitoring is required to prevent damage to neighboring structures. Mandatory Testing
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