DEMOLITION OF THE TWO OLD LADIES OF CAPE TOWN, BY THE CONTROLLED USE OF EXPLOSIVES. PRESENTER, DICK GREEN.

ABU DHABI AMMAN, JORDAN RAMAGUNDAM, INDIA DUBAI GREECE PORTUGAL SOME PAST PROJECTS

Texas Stadium, Dallas Rydges Hotel, Qatar 2 x 175m Chimneys, UK 2010

ATHLONE COOLING TOWERS, CAPE TOWN

SEWAGE PIPE ELECTRIC CABLE & WATER PIPE N2 Motorway PUMPING STATION

LIMITATION AND CONSIDERATIONS 1, Contractor to be responsible for all safety issues and safe access and egress from towers. 2, Minimum disruption to the area. (Demolition could not take place during world cup, and FIFA stipulated N2 route must stay open) 3, Major sewage pipe within 10m of towers must not be damaged 4, Electric cables and Water pipes running within 20m of towers must not be damaged. 5, Vibration and noise to be minimised during blow down

COLLAPSE DESIGN Cooling towers because of their design are relatively simple to demolish with explosives. Other methods of demolition Crane and ball. Cheap, fast, uncontrolled Deconstruct. Expensive in time, labour and materials, men working at height. Scaffold Hanging Hydraulic shear, Expensive in time, equipment. I

Explosives Method (Telescoping) Removal by explosives of 2/3 legs formation by explosives of slot 2/3 circumference in shell by explosives A near vertical collapse of a structure, caused by inducing enough compressive stress at the base to make the disintegration at the bottom a continuous process as the structure descends. Explosives causes sufficient movement after which gravity takes over.

I

I PREPARATION WORKS Make site safe Drill Holes for charges Test Blast Place protection (at source) Remove and clear packs Charge structure Protect services

Explosives used in shell PE BUSTER GEL WATERGEL 25mm x 200mm Medium energy (excellent fragmentation) VOD 3400m/s Can be used in wet holes

External Protection works

BLOWDOWN