Full Issue (17 MB) - Pile Driving Contractors Association
Full Issue (17 MB) - Pile Driving Contractors Association
Full Issue (17 MB) - Pile Driving Contractors Association
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The vibration compacts the concrete and results in a very close<br />
indentation to the soil, improving the skin friction and bearing<br />
capacity.<br />
The usual needed time for set up and finishing the cycle<br />
for the installation of one vibrated cast in place pile does not<br />
exceed 20 to 30 minutes.<br />
Conclusion:<br />
Not one of these multiple and different load tests did<br />
result any negative outcome for vibrated piles. No factor of<br />
correction is required. The installation of the piling system at<br />
the Palm Paper site is the ultimate demonstration for the high<br />
performance of vibrated cast in place piles. All piles of 406<br />
mm diameter, a total of 97.221 running meter, were installed<br />
with two units of Liebherr Carriers LRB 255, equipped with<br />
ring vibrators type 32VMR, resulting an average of 19 piles<br />
per unit and per day. Within the same six months 2.010 piles<br />
of 610 mm diameter and 38.896 running meter were installed<br />
conventional, using four Hitachi /Fundex units with hydraulic<br />
hammers of 9 t drop weight resulting a low number of five piles<br />
per unit and per day.<br />
19 vibrated piles per day versus five piles installed conventional,<br />
theses numbers speak for themselves.<br />
Design and soils engineers in the deep foundation industry<br />
may consider vibrated cast in place piles as an equal way of<br />
installation. With their approval the pile driver contractors are<br />
able offering higher daily performance, reducing the total cost<br />
of the foundation. Standard of any installation of cast in place<br />
piles should be an exquisite Quality Control program, based<br />
Fig. 4: Liebherr Carrier LRB 255 with Ring Vibrator 32<br />
VMR; Photo BVV, Munich<br />
on high sophisticated machinery and equipment, permanent<br />
monitoring and recording of each pile installed and last not<br />
least: a well trained and motivated crew.<br />
References:<br />
BVV, Munich: ”<strong>Pile</strong> Load Tests, Kings Lynn, England”,<br />
Internal Investigation Report, Mars 2009. t<br />
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• Q4 • 2009<br />
47
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