Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

With an output capacity of 90 MW of renewable electricity, Barrow OSWF is an offshore wind farm constructed in UK coastal waters. The site is located approximately 7 km south of Walney Island near Barrow-in-Furness, Cumbria, in the East Irish Sea. Steel monopiles with an outer diameter of 4750 mm and a wall thickness of between 45 mm and 80 mm provide the wind turbines foundations and vary in length between 49.5 m and 61.2 m weighing up to 452 tonnes. Installation of the monopile foundations with a penetration into the seabed of between 30.2 m and 40.7 m was carried out by a process of driving and drilling. The geology of the area beneath the wind farm site comprises sequences of medium dense to very dense sands, firm to stiff and very stiff to hard clays and weathered mudstone/siltstones. Specialist pile driving company IHC Hydrohammer BV of Holland used its 1200 tonnes hydrohammer to drive the monopiles into the subsea soil formations, whilst specialty foundation equipment manufacturer Bauer Maschinen GmbH of Germany, employed its Flydrill BFD 5500 for drilling out the core inside the monopiles to reduce frictional resistance. Main contractor for the project was Marine Projects International Ltd of Middlesbrough, UK. All construction operations were carried out from MPI's jack-up vessel MV Resolution.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

New Bauer Flydrill System Drilling Monopiles at Barrow Offshore Wind Farm, UK

Arlington, Virginia

With an output capacity of 90 MW of renewable electricity, Barrow OSWF is an offshore wind farm constructed in UK coastal waters. The site is located approximately 7 km south of Walney Island near Barrow-in-Furness, Cumbria, in the East Irish Sea. Steel monopiles with an outer diameter of 4750 mm and a wall thickness of between 45 mm and 80 mm provide the wind turbines foundations and vary in length between 49.5 m and 61.2 m weighing up to 452 tonnes. Installation of the monopile foundations with a penetration into the seabed of between 30.2 m and 40.7 m was carried out by a process of driving and drilling. The geology of the area beneath the wind farm site comprises sequences of medium dense to very dense sands, firm to stiff and very stiff to hard clays and weathered mudstone/siltstones. Specialist pile driving company IHC Hydrohammer BV of Holland used its 1200 tonnes hydrohammer to drive the monopiles into the subsea soil formations, whilst specialty foundation equipment manufacturer Bauer Maschinen GmbH of Germany, employed its Flydrill BFD 5500 for drilling out the core inside the monopiles to reduce frictional resistance. Main contractor for the project was Marine Projects International Ltd of Middlesbrough, UK. All construction operations were carried out from MPI's jack-up vessel MV Resolution.