Advances in Drilled Foundation Testing Techniques-PPT Presentation

PPT Presentation

Pdf Summary

The presentation reviews advances in testing drilled foundations to verify that shafts are constructed as designed despite risks such as poor communication, concrete placement through water, and cave-ins.<br /><br />Pre-installation methods assess shaft-bottom cleanliness. An airlift cleanout bucket removes sediment, while the Mini-SID (Shaft Inspection Device) measures sediment thickness. The SQUID (Shaft Quantitative Inspection Device), using a penetrometer and depth-sensing mud plate, evaluates debris resistance. Suggested penetration-resistance thresholds range from 20 lb for very soft clay-like debris to 160 lb for medium-to-stiff clay-like material.<br /><br />For shaft geometry and verticality, Sonicaliper and SHAPE technologies collect and analyze shaft-shape data, including for wet-cast shafts.<br /><br />Thermal Integrity Profiling (TIP) evaluates concrete during curing, typically within 24–48 hours. Thermal wires installed in the reinforcing cage collect data, allowing assessment of the full shaft section and concrete both inside and outside the cage. Data can be accessed through a cloud server. The presentation also highlights advances in TIP analysis, including mid-shaft adjustments to interpret effects such as permanent casing, oversized sections, or unexplained reductions.

Keywords

drilled foundations

shaft inspection

cleanout methods

sediment thickness

SQUID device

Sonicaliper

SHAPE technology

Thermal Integrity Profiling

concrete curing

shaft geometry