Placing Equipment
Chapter 5
Chapter Topics
• Placing concrete directly from trick mixers• Manual or motorized buggies• Crane and bucket• Concrete conveyors• Concrete pumps
Placing Directly from Truck Mixers
• Most economical placing method• Minimal handling; minimizes segregation• With chute extensions up to 20 ft• Deliver 8 to 10 cy and weigh up to 80,000 lbs• Avoid cracking sidewalks and driveways• Avoid open excavations or walls– If wall 6 ft deep, stay 6 feet away
• Take advantage of mixer-mounted conveyors
Manual or Motorized Buggies• Transport from mixer to deposit
• Walk-behind or riding
• Some can fit through 36 inch doorways
• Placing capacity ranges from 15 to 20 cy/hr
• Consider costs– Buggy may need temporary ramps– Can’t run over reinforcing
Crane and Bucket• Lift concrete bucket to desired location
• Typically for small placements: columns
• Two buckets increase production
• Buckets– Different sizes: 1/3 to 3 cy– Different attachments: rubber discharge chutes
Conveyors
• Mounted to ready mix truck
• Separate conveyors
• Can discharge concrete quickly
Concrete Pumps
• Trailer pumps– General purpose: 20 to 35 cy/hr– Pump up to 250 ft vertically – Pump up to 1000 ft horizontally– 4 to 5 inch diameter pipelines– Labor intensive for pipeline placing and removal
Concrete Pumps
• Boom-mounted pumps– Most efficient method for large placements
• Consider these factors– Delivery output– Pump layout and boom length– Site conditions– Number of pumps needed
End of Chapter 5
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