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