Embed Size (px)
Citation preview
PowerPoint® PresentationPowerPoint® Presentation
Chapter 6Chapter 6CranesCranes
Crane Operation • Industrial Cranes • Mobile Cranes • Crane Inspections
Crane Operation • Industrial Cranes • Mobile Cranes • Crane Inspections
Chapter 6 — CranesChapter 6 — Cranes
Cranes are broadly classified as either fixed (permanently installed) or mobile types.Cranes are broadly classified as either fixed (permanently installed) or mobile types.
Chapter 6 — CranesChapter 6 — Cranes
Large cranes are typically operated from inside a cab, which moves with the crane to maintain a good view of the load.
Large cranes are typically operated from inside a cab, which moves with the crane to maintain a good view of the load.
Chapter 6 — CranesChapter 6 — Cranes
Loads must be lifted only from directly above. Side pulling is not permitted.Loads must be lifted only from directly above. Side pulling is not permitted.
Chapter 6 — CranesChapter 6 — Cranes
If a crane operator lacks a good view of the load at all times, an assistant nearby can provide crane directions through hand signals.
If a crane operator lacks a good view of the load at all times, an assistant nearby can provide crane directions through hand signals.
Chapter 6 — CranesChapter 6 — Cranes
Gantry cranes consist of a hoist on a horizontal beam, which is supported by legs that roll along the floor.Gantry cranes consist of a hoist on a horizontal beam, which is supported by legs that roll along the floor.
Chapter 6 — CranesChapter 6 — Cranes
Overhead cranes are similar to gantry cranes except the hoist and bridge beam are supported by overhead beams.
Overhead cranes are similar to gantry cranes except the hoist and bridge beam are supported by overhead beams.
Chapter 6 — CranesChapter 6 — Cranes
Jib-crane booms are supported at only one end but can be configured in several different designs.Jib-crane booms are supported at only one end but can be configured in several different designs.
Chapter 6 — CranesChapter 6 — Cranes
Mobile cranes are crane assemblies that are mounted on a mobile platform. The platform may use a variety of forms of mobility depending on the intended application.
Mobile cranes are crane assemblies that are mounted on a mobile platform. The platform may use a variety of forms of mobility depending on the intended application.
Chapter 6 — CranesChapter 6 — Cranes
An outrigger increases a mobile crane’s footprint, which improves stability.
An outrigger increases a mobile crane’s footprint, which improves stability.
Chapter 6 — CranesChapter 6 — Cranes
Telescoping-boom cranes have the ability to extend or retract the boom, providing significant versatility to its reach.
Telescoping-boom cranes have the ability to extend or retract the boom, providing significant versatility to its reach.
Chapter 6 — CranesChapter 6 — Cranes
The boom of a lattice-boom crane is constructed of a lightweight, open structure that allows these cranes to have particularly long booms.
The boom of a lattice-boom crane is constructed of a lightweight, open structure that allows these cranes to have particularly long booms.
Chapter 6 — CranesChapter 6 — Cranes
The lift capacity of a mobile crane is determined primarily by the horizontal distance of the load from the crane.
The lift capacity of a mobile crane is determined primarily by the horizontal distance of the load from the crane.
Chapter 6 — CranesChapter 6 — Cranes
Lift capacity tables are used to determine the maximum allowable load weight for a particular crane with certain lift distances.
Lift capacity tables are used to determine the maximum allowable load weight for a particular crane with certain lift distances.
Chapter 6 — CranesChapter 6 — Cranes
The inspection of a hoist trolley should include checking the spacing on trolley wheels. The wheels must be close enough to provide a secure attachment to the beam but not so close as to impede free travel.
The inspection of a hoist trolley should include checking the spacing on trolley wheels. The wheels must be close enough to provide a secure attachment to the beam but not so close as to impede free travel.
