Decommissioning of offshore structures by means of explosives
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1 Decommissioning of offshore structures by means of explosives Authors Erik K. Lauritzen, Johan F. Gjødvad and Claus Gormsen NIRAS DEMEX Presented by Johan F. Gjødvad
2 Content Presentation of NIRAS DEMEX Challenges of demolition of offshore structures Demolition and recycling of structures Demolition by explosives one of many tools Decommissioning of Norwegian offshore structures by blasting Decommissioning of wind turbines by blasting Design of decommissioning Q&A
3 Consulting Engineers and Planners: Agriculture Building and industry Civil works Energy Environment Management sciences Urban planning Transportation Social sciences Hazardous waste Defence & security
4 Introduction - NIRAS The number four consulting engineering company in Denmark 1,000 employees 14 offices in Denmark Subsidiaries in Poland, Sweden, Ukraine, Finland, Bulgaria, Greenland, Tanzania and Zambia Turnover: $ 120 mill annually
5 DEMEX Defence and Security Technologies Protection of vehicles against explosions Decommissioning of military installations Blasting for construction Mine & UXO clearance Security for Danish embassies Demolition
6 Selected Offshore References Proposal for blasting of Drogden Lighthouse 2003 Pre-planned dismantling of marine wind turbines, 2001 Review of cost estimation, Frigg Field, 2000 Norwegian offshore structures, decom. study, Study of demolition Ekofisk Tank by blasting, 1998 Proposal for disposal of Brent Spar, 1994
7 Challenges of demolition of offshore structures Heavy concrete and/or steel structures Marine environment Sensitive environment High risk operations
8 Barrow Offshore Wind, monopile arrangement
9 Demolition and recycling of structures 1. Before demolition all environmental problematic materials must be removed (e.g. asbestos, PCB, oil and chemicals etc) 2. Striping of structure removal of all installations, doors, windows, floors, machinery etc. 3. Selective demolition of structure downsizing of bearing steel/concrete members and sorting of the fractions on site. 4. Transportation to disposal site or treatment site 5. Recovery, recycling, reuse or disposal of waste materials 6. Cleaning up and hand over of the site
10 Technologies for demolition of structures Types of demolition: Total demolition Partial demolition Type of demolition methods: Downsizing, treatment of materials of site Downsizing, treatment of materials on site Dismantling of structure members by cutting and crane lifting Demolition technologies: Concrete breakers Steel cutters Chain and ball Hydraulic jack hammers Blasting Water jetting oxygen cutting
11 Demolition by blasting - advantages No need for big machines only drilling machines explosives Modern technologies e.g. shaped charges and MINIBLASTING made possible to control the effects and risks. Blasting is carried out as a remote tool Blasting very applicable to dismantling methods
12 Practical Experience of Mini-Blasting: Blasting of Foundation Piles
13 Practical Experience of Mini-Blasting
14 Dismantling 1. Drilling 2 Charging 3. Hook on crane 4. Blasting 5. Cutting of bars 6. Lifting
15 Demolition of offshore structures by blasting Total demolition of offshore structures has been a preferable method for many years (e.g US platforms). However, the environmental impact, especially the impact to fish from big explosives charges has been is a great problem. Blasting was the only possible method for removing several damaged structures after the Hurricane Katerina, 2005 To day new blasting technologies with small explosives charges and designed protection means open new application for blasting as a supplementary demolition tool.
16 Demolition of offshore structures by blasting Typical applications: Blasting of concrete structures by explosive charges in drill holes Cutting of mono-pile foundations by explosive cutting charges Cut of top site structures for dismantling by crane Blasting of damaged offshore structures Blasting of anchors, risers etc. Weakening of structures before demolition.
17 Dismantling of offshore concrete structures by blasting Experiences of the project Removal Offshore Concrete Structure conducted by a number of Norwegian offshore industries in DEMEX was subcunsultant to Dr. Tech. Olav Olsen, Oslo on the study of dismantling the structures of Gulfaks by blasting, including: Dismantling of shafts Dismantling of tri-cells Risk assessment
18 Dismantling of Shafts Blasting of Shaft Structure, For crane lifting Dismantling of three element < 300 t 6.6 m 0.5 m Drill hole Drill holes 12 m For crane lifting
19 Dismantling of Shafts For crane lifting Blasting of Shaft Structure, Dismantling 300t-3,000t 40 m 0.5 m 0.5 m Bore holes 6.6 m
20 Dismantling of Shafts Blasting of shaft structure, fragmentation 0.65 m Ri = 6.60 m 2.0 m Reinforcement bars Drill hole 0.65 m 0.65 m 0.65 m
21 Dismantling of Tri-Cells Area chrushed by blasting Supplementary holes for fragmentation 3.60 m 0.7 m 0.70 m 1.40 m 1.40 m 1.40 m 0.7 m Blasting of Tri Cell structure, dismantling Blasting of Tri Cell structure, weakening
22 Dismantling of offshore steel structures by blasting Cutting of steel using shaped charges Types of shaped charges
23 Dismantling of offshore steel structures by blasting using shaped charges Principles of the effect of shaped charges
24 Perfolit 16 kg 16 kg charge Filled with Bonogel (PTEN based explosive) (possibly with Dynamite or other explosive) Can be used at an underwater depth of approx. 70 m
25 Explosive cutting tape (ECT) BLADE
26 BLADE/ECT
27 BLADE/ECT
28 BLADE/ECT
29 Proposed cut of mono-piles Horns Rev 1, 2001 Dismantling of mono-pile of wind turbine, 2 MW: 1) Nacell and tower shaft are removed. 2) Interior ballast inside the monopile removed 3) Shaped charge, designed for cutting the still, 50 mm thick, mounted inside the mono-pile 1 m below bottom line. 4) Crane hook on the shaft. 5) Detonation of the explosive charge. 0.0 DENSIT fixture ) Removal of the shaft. 4.0 m Thickness 50 mm
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34 Conclusions Blasting of concrete and steel structures has an important role in the demolition industry Remote cutting of steel and concrete structure by blasting is quick and safe The blasting methods must be designed and compared with traditional demolition methods The risk of blasting is of the same level of other demolition technologies Dismantling of concrete and steel offshore structures is a favourable demolition method
35 Any Questions? Thanks for the attention Johan F. Gjødvad
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