Casing Method of Construction - Drilled Pier Foundations.
Figures 17.7(a) to (h) give the sequence of operations. Withdrawl of the casing, if not done carefully, may lead to voids or soil inclusions in the concrete, as illustrated in Fig. 17.8.
Figure 17.7 Casing method of construction: (a) initiating drilling, (b) drilling
slurry; (c) introducing casing, (d) casing is sealed and slurry is being removed
interior of casing (continued)
slurry; (c) introducing casing, (d) casing is sealed and slurry is being removed
interior of casing (continued)
Figure 17.7 (continued) casing method of construction: (e) drilling below casing
(f) underreaming, (g) removing casing, and (h) completed shaft (O'Neill and
Reese, 1999)
(f) underreaming, (g) removing casing, and (h) completed shaft (O'Neill and
Reese, 1999)
Figure 17.8 Potential problems leading to inadequate shaft concrete due to
removal of temporary casing without care (D'Appolonia, et al., 1 975)
removal of temporary casing without care (D'Appolonia, et al., 1 975)
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