The LB 44-510 is one of the first of this model to have been delivered to Southeast Asia. Both the Liebherr rotary drilling rigs were delivered with extensive training package for Aneka Jaringan’s operators and service personnel.
Loke Kien Tuck, director of Aneka Jaringan, said that both the LB 44 and the LB 36 are boring to depths of a maximum 35 m, with the maximum pile diameter being 1.8 m.
“Because of the local regulations the site can work only between the hours of 8 am and 7 pm,” he says. “We therefore have to work quickly, and the two machines are proving to be very fast. The ground is quite hard, being mostly silty sand, and we are taking between five and six hours to bore down to between 30 and 35 m. That means we can complete the boring and casing installation in one day, and then pour the concrete the following morning.”
The Liebherr HS 8100HD, equipped with a mechanical slurry wall grab, and the HS 855 HD duty cycle crawler crane, equipped with a hydraulic slurry wall grab, are excavating to a maximum depth of 22 m for the 0.6 m width slurry wall. The cranes are digging the trench in sections of 6.5 m, each section taking an average of four days to complete.
Mr Loke says that water-soluble polymer is being used to stabilise the borehole, rather than bentonite, as it has a lower environmental impact and is more cost-effective to use on this project.