Dredging large amounts of sediments
Since July 2016, a Liebherr HS 8130 HD cycle duty crawler crane, belonging to the newest generation, is operating amidst the Swiss Alps. It is being used to dredge large amounts of sediment on the filter grids of the Lake Luzzone reservoir. At depths of up to 200 m, a total of 125,000 m³ of material has accumulated in close proximity to the power station.
It is anticipated that the duty cycle crawler crane will be operating for two years during summer months. Only after the completion of this work can the power station in Olivone be put back into full operation.
The importance of this project derives from the fact that a yearly average of 180 million m³ of water flow through the turbines of the Olivone power station and consequently generate approximately 234,000 MWh of energy.
The delivery of the construction machine imposed an immense challenge for the transport company. On the way to its job site the duty cycle crawler crane did not only have to negotiate numerous hairpin bends but also pass through two narrow tunnels and cross a 225 m high dam. Furthermore, shortly before transportation the road had to be cleared of fallen rock.
Precise planning in advance
The high number of bends in the last stretch of the road, the bad weather with heavy rainfall and the danger of falling rock were a real challenge.
Steep roads with several serpentine bends
Due to the extremely limited amount of space the uppercarriage and the undercarriage of the duty cycle crawler crane were delivered separately.
High number of bends in the last stretch of the road
The basic machine’s low transport weight of only 51 tonnes and the maximum transport width of a mere 3.5 m were an enormous advantage.
Spectacular crossing of the dam
Before reaching its destination a 225 m high reservoir dam had to be crossed. The wall was completed in 1963 and lies 1609 metres above sea level.
Restricted space in the tunnel
In order to pass through the two narrow tunnels the duty cycle crawler crane had to be transferred to a smaller carrier shortly before its destination.
Assembly on the shore of the reservoir
The assembly of the HS 8130 HD was carried out directly on the shore of the reservoir with the aid of a Liebherr mobile crane of the LTM series.
Operation on a floating barge
Subsequently the duty cycle crawler crane was driven onto and mounted on a barge, which was also assembled on-site. And so the work could begin.
Dredging with a special clamshell
The new HS 8130 HD is equipped with a specially produced mechanical clamshell bucket from Negrini. In this combination outstanding turnover cycles can be achieved.
Thanks to its robust design the Liebherr duty cycle crawler crane is ideally equipped for the dynamic forces which especially influence the uppercarriage in dredging operation.
Clamshell for dredging
In order to carry out the dredging work the HS 8130 HD is equipped with a mechanical clamshell bucket from Negrini, which was specially produced for great depths.
Dredging work in Piombino to remove deposited sediment from the mouth of the port. Job report port dredging
Duty cycle crawler cranes at a glance
The duty cycle crawler cranes are robust and flexible in use and thus perfectly designed for dynamic applications. Thanks to their efficient hydraulic system great turnover performance is achieved.