demolition of the two old ladies of cape town, by the controlled use of explosives. presenter, dick...
Post on 29-Dec-2015
215 Views
Preview:
TRANSCRIPT
DEMOLITION OF THE TWO OLD LADIES OF CAPE TOWN,
BY THE CONTROLLED USE OF EXPLOSIVES.
PRESENTER, DICK GREEN.
ABU DHABI
AMMAN, JORDAN
RAMAGUNDAM, INDIA
DUBAIGREECE
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
top related