Pile Design and Construction Practice, Fifth edition

Maximum height 26.32 m
Usable leader length with SuperRAM 6000 18.6 m
18°
4.095 m 4.29 m
Figure 3.2 Banut 650 piling rig (courtesy ABI GmbH).
Piling equipment and methods 75
45° (with 2-point support)
Box section leader with
lateral inclination
Adjustable stays
an optional 35 o leader rotation (Figure 3.3). In ‘fixed extended’ arrangements, the leaders
extend above the top of the jib with a connector which allows freedom of movement.
Leaders are usually provided in top and intermediate sections about 5 and 2.5 m long jointed
together to provide the required leader height. As an alternative to spotters, simple hydraulic
telescopic rams are used to enable raking piles to be driven, with a bottom stabbing point
section bearing on the ground, levelled by hydraulic jack. BSP International Foundations
Ltd fixed extended leaders have lattice panel lengths of 7 m for the 610 mm square section
and 7.5 and 10 m for the 835 mm square section. The respective maximum lengths under
the cat-head are 22.5 and 38 m, subject to crane jib length; maximum load for pile and
hammer at a back rake of 1:12 with the 610 mm section is 12 tonne, and 21 tonne for the
835 mm section at a back rake of 1:3 using standard stays.