Presentation by Eric Peeters emphasising on best practices when surveying for the Maasvlakte 2 extension of the Port of Rotterdam and related works.

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Construction and Survey Accuracies for the execution of rockworks
Eric Peeters | 30-09-2014
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Best practices from the “Maasvlakte 2” Port Expansion Project
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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
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Index
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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
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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)
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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
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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
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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”
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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
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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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2. Construction aspects Construction and Survey Accuracies for the execution of rockworks

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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
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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
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3. Surveying Construction and Survey Accuracies for the execution of rockworks

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Hard sea defence
Progress drawing
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3. Surveying Construction and Survey Accuracies for the execution of rockworks

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Hard sea defence
As-Built drawing
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3. Surveying Construction and Survey Accuracies for the execution of rockworks

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Testpit
PUMA (2010) vs Verolme (1999)
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3. Surveying Construction and Survey Accuracies for the execution of rockworks

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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
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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
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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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Are there any questions?
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Thank you for your kind attention
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