Woltman THW 7528-D - Van 't Hek
This is the second Woltman THW 7528-D of Van 't Hek.
The machine is used here to make HEK-piles for a new office for the Rabobank in Alkmaar (NL).
The rear outriggers are extended to give contra-pressure during drilling.
The leader is about 36 metres long.
As assist crane is a Sany SCC500E used.
By a HEK-pile is the drilled pile filled with rebar and concrete followed by the drilling out the tube whereby the pile is rotating right- and leftwards.
The Woltman WG-40 rotary drill.