7/30/2019 ERKE Group,Trio 3x200HD PTC Vibrodriving monopiles in the Anholt Offshore wind farm, Denmark

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The Anholt windarm will become Denmarks largest oshore wind arm with an

overall capacity o 400MW and will cover 4% o Denmarks total power consumption.

THE PROJECT

Dong Energy wanted to test Vibrodrivers technology as an alternative solution to

impact hammers, or driving monopile oundations in oshore windarm projects

while reducing noise emissions under water.

The job required driving monopiles o conical shape with a bottom diameter

exceeding 5m and weighing 275 t. The complexity o this job with harsh oshore

weather conditions and heavy piles, required a customised solution that PTC had

the capability to provide in a very short time delivery.

The pile driving equipment proposed by PTC was a Trio o 2OOHD Vibrodrivers

perectly synchronized to get an eccentric moment o 600 m.kg. These

Vibrodrivers were powered by 3 PTC power packs 1200C model, supplying

a tota l power o 2418 kW. A PTC Vibmaster monitoring system was used to

display and registered important piling data, such as depth, vibration amplitude and

power.

DONG Energy, which has erected half of the worlds majoroffshore wind farms, is currently building Denmarks large-scale offshore wind farm, which includes an area of 88kmbetween Grenaa and the island of Anholt.

Trio 3x200HD driving monopiles

in the Anholt Offshore wind farm,Danemark

KEY FACTS

Patented

synchronisation

technology

275 t conical

shaped monopile

600 m.kg

eccentric moment

2418 kW

7/30/2019 ERKE Group,Trio 3x200HD PTC Vibrodriving monopiles in the Anholt Offshore wind farm, Denmark

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FIRST PHASE: ONSHORE TEST, SYNCHRONISATION IS THE KEY

The synchronisation o the 3 Vibrodrivers as well as the 3 power packs was a complex task. PTC studies

in this matter, resulted in a patented synchronization technology based in PTCs long time know how in

mastering vibration and producing high-end power packs.

In order to adjust the synchronisation o the PTC equipment beore taken it to the barge, the jobsite begun

with a onshore test. In this inital phase taken place in the Aalborg harbour, the Trio o PTC 200HD drove

into the ground a shorter test pile, which was then extracted with the same equipment. PTCs technological

approach was confrmed and the equipment was then taken to the barge.

SECOND PHASE: OFFSHORE PILE DRIVING

The next phase o the project was oshore in the waters o Kattegat between the North and the Baltic seas,

and just a ew kilometers away rom the Anholt island.

The PTC pile driving equipment was

installed in the SVANEN barge owned by

the company Ballast-Nedam. PTC servicetechnicians qualifed or oshore operations

were on board as well, and assured the

operations and the equipment installation,

commissioning and support until the end o

the jobsite.

The driving o the 275 ton piles started as

soon as the weather conditions were

avourable . The piles were driven to

the stipulated depth in less than 30 min

in a soil consisting o dense sand and

compact silty sand.

In addition o an excellent driving speed

o the pile, PTC Vibrodrivers proved a

signifcant environmental advantage, as

these vibrators can drive the pile respecting

the most recent German regulations in

noise emissions under water. Dong Energy

perormed several sound measurements

and confrmed its satisaction in the PTC

driving solution or oshore windarms.

On the Svanen barge,

during the driving of the

conical shape monopiles.

During the test phase,

the Trio of 200HD Vibrodrivers

with six 250 t clamps

at the Aalborg Harbour.