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in one of their three quarries.

The jobsite is located in the South of

Germany, close to the city of Ingolstadt.

The proportions are remarkable.

The machine, with an entire weight of

more than 350 tonnes, operates on the

site with a 44 m long main boom and a

dragline bucket made by Rädlinger.

The digging depth is approximately

26 m, the unloading height about 15

m. Apart from the dimensions of the

HS 8300 HD, which dwarf other duty

cycle crawler cranes in comparison,

the machine impresses with its in-

novative hybrid drive allowing an

increase in turnover at the jobsite by

up to 25%.

Powerful hybrid drive

Pactronic

The HS 8300 HD is the first construction machine on the

market to be equipped with the Pactronic system devel-

oped by Liebherr.

This innovative hybrid drive based on hydraulics offers

both economic and ecological advantages.

Surplus energy is stored and subsequently regener-

ated so increasing the material handling capacity while at

the same time significantly reducing fuel consumption.

Liebherr-Werk Nenzing GmbH

USA

Cranes Improve Productivity

In Transmission Line

Upgrade

On a 500Kv Power Transmission job site in Arkansas the

contractor described the following

scenario where the Tadano Mantis

greatly increased his productivity

and shortened the installation time

of dampeners and spacers on a high-

voltage line:

The contractor had to install 1800

dampeners, designed to reduce line

vibration in high winds, every 15

yards on these lines. He had a 21 day

window of time with the power shut

off to accomplish this.

Using a Tadano Mantis crane with

a Work Platform attachment the

crew had one man on the ground

walk under the lines and plant mark-

er flags every 15 yards.

The crane operator followed with

the boom parallel to the ground

and workers in the platform. They

stopped at each flag, boomed up,

and the crew installed the dampen-

ers. Then they would boom down, walk the crane to the

next flag, and repeat the procedure.

By using this method, and taking advantage of the

Mantis’s ability to lift without using outriggers, the con-

tractor was able to install 100 dampeners per day and

complete the task in 18 days.

The contractors would have used a tracked utility ma-

chine with a work platform. Their procedure would have

been similar, except that they would have had to carefully

position the machine, deploy outriggers, and then boom

up. The additional time needed to position the machine,

and deploy and retract outriggers would have allowed

installation of only 20 dampeners per day and would have

needed 90 days to accomplish the same task.

Tadano Mantis

Page 9

Contractors World International Vol 6 No 4

Worldwide Panorama