Page 165 - Urban Construction Project Management

120 Chapter Six
Exhibit 6-4 HOIST #1
Labor and materials
Crane locations.
Loading/unloading area

Sidewalk
bridge

Delivery gate
Delivery gate

Labor gate

Labor gate

Delivery gate Labor gate

Loading/unloading area

For a crane sitting on a city street, the load bearing capacity below its base will have to
be analyzed by a structural engineer. The effects of the crane on underground utility
vaults, transportation systems, and foundations in the area will have to be considered.
In some instances, a crane is supported on the building structure and the building must
be designed to sustain the loads in combination with other loads that occur during con-
struction. As the self-raising crane starts “growing,” then it has to be tied into the build-
ing structure for stability and the building must be designed to support its load. This
usually occurs at every 60 to 100 feet. See Exhibit 6-6 for tower crane stages.

Exhibits 6-7 to 6-10 show various components of the crane including:

• Crane’s cab (Exhibit 6-7)
• Climbing crane with structural support (Exhibit 6-8)
• Crane’s structure (Exhibit 6-9)
• Crane’s collar support to structure (Exhibit 6-10)