07/1173 - Operational Works - Transport Type 6 - Refurbishment of Boathouse & Jetty [As Published] · 142007.1173

11/G& "03 MON 06:50 FAX 07 4936 1708 ROCLA POLES QLD Bore

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{Installation (cont) }

Final Placement

The normal methods of ‘final placement’ are:

- Jetting.
- Potting.
~ Driving.

The setting depths must suit the over-tuming moments, specified by the
marina designer, and the design shear forces. The minimm setting depth may be
limited by the pile’s sheex strength in hard foundation material.

Notes that are common to all piles ;

all piles are fitted with a headband which allows the piles to be driven.
- sea water is not allowed inside the pile, If it does enter before
installation is completed, the sea water must be extracted before the job is

completed.

Jetting

Jetting is commonly used when the foundation material consists primarily
sand, The process essentially avoids stressing the pile. This process is
preferred over driving as driving through sand generally creates relatively high
stresses in the pile.

Piles that are jetted need to be ordered with a 5¢mm dia Class 9 uPVC jetting
tube, The jetting water is te only pass through the jetting tube - it is not to
act against the inside of the pile.

The jetting tube is fixed inside the pile at the manufacturing stege, running
from the toe to SOmm above the head. The tube has a coupling at the head end to
allow e screw connection to the hose that delivers the high pressure water. The
pressure of the water vie the jetting tube disturbs the material under the pile
allowing the pile weight to lower the pile. The higher the pressure, the more
the material cisturbence under the pile. The maximum allowable jetting pressure

is 900 kPa.

These piles may also be driven, The jetting tube should be cut back to allow
the packing material, see below, to make even contact with the pile head.
Driving can be done without jetting or after jetting. Driving can provide
greater accuracy of final height, compared to jetting, and retain undisturhed
soil strength around the pile toe, Driving shculd follow the guidelines below.

- “ft .

- ee me ee

Paga 8 of 9