3 April 2012 – Jeroen Gheysens

DEME | II SEMINAR BRAZIL – BELGIUM

WATERWAYS

CONTENTS

1. DEME - DRAGABRAS

2. Case 1: Maintenance Dredging on the River Scheldt

3. Case 2: Rock Dredging by Drilling & Blasting on the Panama Canal

DEME - DRAGABRAS

DEME GROUP - 6 AXES OF ACTIVITY

DREDGING AND LAND RECLAMATION

MARINE AND CIVIL ENGINEERING

ENVIRONMENTAL SERVICES

FLUVIAL AND MARINE AGGREGATES

PROJECT DEVELOPMENT & CONCESSIONS AND RENEWABLE ENERGY

MARITIME SERVICES

CASE 1 – MAINTENANCE DREDGING

WESTERN SCHELDT – RIVER SCHELDT

Distance Antwerp to Flushing: 90 km

Green = Dredging Zone / Blue = Disposal Area

Borssele – 14,6m

Hansweert – 14m Zandvliet – 13,7m

Lillo– 11,7m

Client: Ministry of the Flemish Community – Maritime Access Division

7-year contract

Contract value: 594.000.000 EUR

Volumes

- Sand: 13.000.000 m3/year

- Silt: 1.500.000 m3/year

Average sailing distance to disposal area:

- Sand: 23 km

- Mud: 15 km

Who pays what: Belgium 60% - Holland 40%

GENERAL

Trailing Suction Hopper Dredgers (5.000 m3 – 14.000 m3)

EQUIPMENT

Sweepbeam

EQUIPMENT

Spreader Pontoon – To dispose materials in shallow areas

EQUIPMENT

Minimal density per trip 1,15 ton/m3

Captains and 1st Mates must have minimum 6 months of experience on

the River Scheldt

Payment

- BIS (Bagger Informatie Systeem – Dredging Information System)

- Volume and disposal distance

- Price escalation parameters

- Fuel

- Salaries

- Equipment index

CONTRACT CONDITIONS

Penalties

- BIS Sensors not operational > 24h: 7.500 EUR/day

- Trip density < 1,15 ton/m3: trip not paid

- Launch not available for Client’s Representative: 12.500 EUR

- Captains with less than 6 months experience on Scheldt: 12.500 EUR

- …

CONTRACT CONDITIONS

Dredged quantities per locations vary each year

Weekly meeting client and contractor (progress and planning)

Official representative of Client on board of the dredging vessel

Control of works and siltation by Client through regular sounding

Research programs on silt storage and silt treatment

Studies on improvement of efficiency of the dredging works

SPECIFIC CHARACTERISTICS

Rainbowing with TSHD Reynaert in Baarland

WESTERN SCHELDT – RIVER SCHELDT

CASE 2: DRILLING & BLASTING

Volcanic Rock approach channel locks / entrance channel

PACIFIC ENTRANCE PANAMA CANAL

Client: ACP - Autoridad del Canal de Panama

Contract value: 177.500.000 USD

Volume: 9.100.000 m3

- Very soft clay and silt: 4.400.000 m3

- Silt and sand sediments: 1.200.000 m3

- Sedimentary Rock: 2.000.000 m3

- Volcanic Rock: 1.500.000 m3

Payment: 1 unit rate regardless of the soil type

GENERAL

Severe environmental demands

Classification of materials to be dredged

Interaction with commercial traffic on the canal (40 vessels per day)

Interfaces with authorities

Equipment planning

CHALENGES

ACP data since 1940

Inhouse data from DEME

Additional investigations

- Geophyisical survey

- Side Scan Sonar and Sub Bottom Profiler

- Georesistivity Survey

- Seismic Refraction

- Geotechnical survey

- Boreholes

- Labtesting

SOIL ASSESSMENT

EQUIPMENT

Self propelled drill schip (101 long - 18m wide – draft 3,9m)

10 drill towers – 2 tilting spuds – 2 auxiliary spuds – 6 anchors

75 navigation and operational crew

Rioflex®

Extremely liable and safe for

underwater blasting

Excellent water resistance

Ideal velocity of detonation

Excellent safety characteristics

Safe to handle

EXPLOSIVES

ANIMATION MOVIE

144 blasts executed in 6 months time without spillage

Vibration levels under the norms

No noise

No overpressure

No complaints from the neighbors

No fly rock

A CONTROLLED technology

Monitoring

- Vibration monitoring with seismographs

- NOx monitoring from the blasting gases

ENVIRONMENTAL

Block size of 350mm

Rehandling of blasted rock

with Cutter Suction Dredge /

Backhoe Dredge or Clamshell

Dredge

BLASTING - FRAGMENTATION

Fast

- Panama: 1.000.000 m3 in 6 months time

Safe

- Type of explosive

Economic

Environmental Friendly

ADVANTAGES

Dragabras Serviços de Dragagem Ltda.

Av. Almirante Barroso 63 – Sala 2309

Centro – Rio de Janeiro

(021) 2292 8340

info@dragabras-deme.com.br

CONTACT