PROJECTLEAFLETKEMI, AJOS, FINLAND MONPILE, OFFSHORE WIND POWER TURBINE FOUNDATION

Terramare Oy

Laurinmäenkuja 3 A

PO Box 14, FI–00441 HELSINKI, FINLAND

P +358 9 613 621 | F +358 9 6136 2700

www.terramare.fi PAGE 1/4

FEATURES

Client PVO–Innopower Oy (Since 2011, Innopower Oy)

Location Kemi, Ajos, Finland

Period Year of completion 2009

Contractor Terramare Oy

SCOPE

Monopile – a wind power turbine test foundation project, including dredging of overburden, drilling, blasting and dredging of the foundation pit, and transportation, installation and concrete casting of the steel foundation cylinder. The contract also included supporting services for the installation of the actual wind power turbine tower utilizing the multi-purpose platform Playmate.

INTRODUCTION | MAIN PLANT >

A Installation of a power plant test tower into the Monopile foundation.

A

B Northern sea and winter conditions were analyzed in a Monopile foundation test.

B

PAGE 2/4

MONOPILE STRUCTURE

Mon

opile

foun

datio

n cy

linde

r 17

.5 m

+ 3.

0 m

Con

cret

e 8.

0 m

Pow

er p

lant

test

tow

er +

80.

0 m

Rock

INTRODUCTION

In the Gulf of Bothnia, near the port of Ajos a research project has been initi-ated in which a new solution for off-shore wind farm foundations is being piloted in 2009–2010. The applicabil-ity of the new technology, particularly in northern sea and winter conditions,

will be analyzed in a test foundation called Monopile. The ob-jective of the project is to develop a cost-effective foundation solution for extensive offshore wind power farms.

Dredging of Overburden, Drilling and Blasting

The project was commenced by dredging the overburden. The sediment layer covering the bedrock surface was removed with a backhoe dredger at level –7 metres. After this phase,

C

PAGE 2/4

C Installation of the 80 metre power plant test tower was executed by utilizing the upgraded Playmate, a specialized multi-purpose drill platform with a bearing capacity of 1,000 tonnes.

a cylinder-shaped pit was blasted in the sea bottom. The diameter of the pit was 5 metres and its depth 8 metres. The emptying of the pit was executed with a grab bucket and an airlift pump.

Installation of the Monopile Foundation Cylinder

The 100-tonne steel Monopile foundation cylinder was transported with the fl oating crane Nosto-Pekka. The cyl-inder was erected in the excavated pit to exact tolerances, after which it was cast in concrete both inside and outside.

LOCATION OF THE MONOPILE FOUNDATION

0 500 m

Ajos Harbour, Kemi

Location of Monopile

Kemi Wind Farm

D E

F G PR

OJE

CT

LEA

FLET

— M

ON

OPIL

E, O

FFSH

OR

E W

IND

PO

WER

TU

RB

INE

FOU

ND

ATI

ON

TER

RA

MA

RE

OY

— W

WW

.TER

RA

MA

RE.

FI

PAGE 3/4

G

F

E

D The backhoe dredger Marika was used in dredging the overburden of the Monopile foundation.

The drill platform Pora-Eero was used for underwater drilling and blasting and for installation support of the foundation cylinder.

The tower body tubes and concrete elements were transported with the work platform Paalu.

The floating crane Nosto-Pekka was used for transportation of the foundation cylinder and for hoisting it into position.

>

KEMI, AJOS, FINLAND MONPILE, OFFSHORE WIND POWER TURBINE FOUNDATION

This

info

rmat

ion

cont

aine

d in

this

dat

a le

afl e

t is

for

guid

ance

pur

pose

s on

ly a

nd m

ay b

e su

bjec

t to

chan

ges.

© C

opyr

ight

Ter

ram

are.

All

right

s re

serv

ed.

Terramare Oy

Laurinmäenkuja 3 A

PO Box 14, FI–00441 HELSINKI, FINLAND

P +358 9 613 621 | F +358 9 6136 2700

www.terramare.fi PAGE 4/4

The top of the Monopile foundation cylinder was at a level of +3 metres above sea level after casting.

Power Plant Tower Installation

On the Monopile foundation a power plant tower constructed of three body tubes was installed. The tubes were transported on a towable work platform to the foundation area. Tower tubes and concrete elements corresponding in weight to an actual engine room were lifted up to 80 metres. The installation work was done from Playmate, a specialized multipurpose drill plat-form.

Multi-Purpose Drill Platform Playmate

The upgraded multi-purpose drill platform Playmate, which has a bearing capacity of 1,000 tonnes, was used as the crane base in the installation of the tower tubes and elements. The versatile Playmate, which has been technically fully upgraded, also serves as a platform for piling and concreting as well as a drill platform for underwater drilling and blasting.

MAIN PLANT IN MONOPILE PROJECT

Backhoe Dredger Marika

Self propelled barges Adam and David

Floating Crane Nosto-Pekka

Drill Platform Pora-Eero

Work Platform Paalu

Multi-Purpose Platform Playmate

H

H Installation of the concrete elements on top of a test tower.