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Construction and Survey Accuracies
for the execution of rockworks
Eric Peeters | 30-09-2014
Dredging and Marine Contractors
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Chapter title
Best practices from the
“Maasvlakte 2”
Port Expansion Project
Dredging and Marine Contractors
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Personal
─ Eric Peeters
─ BSc in Hydrography
─ Chief Survey Maasvlakte2 and responsible for:
− Survey Test pit
− Survey crane “Condor”
− E-Crane “Blockbuster”
− Daily survey operations Hard sea wall
− Managing MV2 survey department
─ Software test engineer HQ Rotterdam
Introduction
Dredging and Marine Contractors
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Index
Dredging and Marine Contractors
1. Introduction 2. Construction
Aspects 3. Surveying 4. Evaluation of
construction
accuracies and
survey
accuracies
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PUMA
Boskalis 50%
Van Oord 50%
MV2
─ Value 2.9 billion Euro
─ Final completion 2030
PUMA
─ Value 1.1 billion Euro
− Includes Sea defenses
− Includes Reclamation
− Includes Infrastructure (BAVO)
─ Completion 2013
Dredging and Marine Contractors
Project Background
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Contract 1
Dimensions
─ Hard sea defence 3.5 km
─ Beach and dunes 7.3 km
─ Port basins 530 ha
─ Port area 700 ha
─ Quay wall 3.5 km
─ Road 13 km
─ Rail 14 km
Quantities
─ 240 million m3 of sand
─ 7 million tonnes of rock
─ 20,000 concrete blocks (40t/pcs)
Dredging and Marine Contractors
Project Background
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Design – Construction - Survey
Design
─ Contractual specifications / requirements
− Unrealistic, unachievable or unnecessary strict requirements
Construction
─ Practical limits
− Costs
Survey
─ Surveying errors
− Systematical
− Random
Client and contractor to have a better understanding at start of entire process
Dredging and Marine Contractors
1. Introduction Construction and Survey Accuracies for the execution of rockworks
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Innovative design features
Withstand 1/10,000 year storm
─ Wave height 9m
─ Wave direction North, North-West (348°)
─ Duration of 12 hours
Soft sea defence
─ Use of Pleistocene sand
− Steeper foreshore
Hard sea defence
─ Re-use of MV1 materials
− 2 million tones of quarry stone
− 20,000 concrete blocks
Dredging and Marine Contractors
1. Introduction Construction and Survey Accuracies for the execution of rockworks
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Hard sea defence
“Stony dune with a reef of blocks”
Dredging and Marine Contractors
1. Introduction Construction and Survey Accuracies for the execution of rockworks
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Vertical accuracy
─ Equipment type
─ Work method
─ Size and grading of rock
─ Ambient hydraulic conditions
Dredging and Marine Contractors
2. Construction aspects Construction and Survey Accuracies for the execution of rockworks
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Specialized Equipment
─ Ability to place 40 tons concrete blocks at a distance of 50m within 10cm.
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Inaccuracies as a result of the quality of the survey system
Quality of the installation
─ Software, sensors, platform geometry, corrections for draught, heave, roll and pitch
Quality of operation
─ Calibration of the equipment has been executed sufficiently precise and frequent
─ Version control and settings
− Protocols & instructions
─ Pre-define amount of coverage / point density
─ Processing
Dredging and Marine Contractors
3. Surveying Construction and Survey Accuracies for the execution of rockworks
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Defining accuracy
The survey accuracy can be defined as the extent to which a collection of individual observations actually reflects the true situation
Average level (macro tolerance) Minimum level (micro tolerance)
Large area 400*Dn502 Small area 16*Dn502
Systematic errors
─ Error which produces a systematic offset between observed values and the true values
− E.g. incorrect tidal values, incorrect draught, incorrect speed of sound
Random errors
─ The random error is the difference between the value of an individual observation at one location and moment in time compared to the average value which would result from a long series of observations at the same location
Dredging and Marine Contractors
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Hard sea defence
Progress drawing
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Hard sea defence
As-Built drawing
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Testpit
PUMA (2010) vs Verolme (1999)
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Above water / Surf zone
Standard method (CUR 154)
─ Use of a semi-spherical foot
− Diameter of half the nominal average stone diameter (D = 0.5 x Dn50)
− 1m x 1m grid
− Reference level ± 10-15% below top
Alternative methods
─ Use of a square plate of 1m2 and 4m2 (± 4 x Dn502)
─ Point measurements
─ Crane Monitoring System
− Bucket or grab
─ Static and mobile laser measurements
− Including airborne systems
Dredging and Marine Contractors
3. Surveying Construction and Survey Accuracies for the
execution of rockworks
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3. Surveying Construction and Survey Accuracies for the execution of rockworks
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Under water / Surf zone
Accepted method
─ Multibeam systems
− 6 different types of multibeam
− 101 - 256 beams (3°-1.5°- 0.5°)
− Full coverage
− Lower volume detected
Alternative methods
─ Single beam
− Standard (7°) and narrow beam (3°)
─ Echoscope
− 3D acoustic camera
− 16.000 beams (0.3°x0.3°)
─ Crane Monitoring System
Dredging and Marine Contractors
3. Surveying Construction and Survey Accuracies for the execution of rockworks
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Are there any questions?
Dredging and Marine Contractors
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Thank you for your kind attention
Van Oord | Marine ingenuity
Get inspired at magazine.vanoord.com.
Dredging and Marine Contractors