Construction Cost Estimating by Len Holm; John E. Schaufelberger

Author:Len Holm; John E. Schaufelberger
Language: eng
Format: epub
Publisher: Routledge
Published: 2021-06-15T00:00:00+00:00

These are important questions to consider and address when preparing the tower crane estimate. As mentioned in the overview, these questions are generally included in the template provided by the GC for crane estimates to help determine costs when necessary.

Crane erection

It should be noted that most cities have crane erection companies that will construct and dismantle tower cranes. When deciding how to erect the crane, the contractor should compare the cost of managing the work themselves (if they are capable) with the cost of using a crane erection company, as well as the risks involved, when making their decision. The following paragraphs describe the costs involved with erecting the crane regardless of who does the work.

Tower cranes are engineered to be built relatively quickly, like an erector set, but they cannot go up themselves. Typically, erecting a tower crane requires the use of another mobile crane or crawler crane to hoist the pieces into place. Generally, it can be assumed that the tower crane can be built in one or two days, and the rental costs for the crane and their hoisting crew can be established by requesting a quotation from a mobile crane company. Similar to determining foundations, the location and hoisting requirements for the mobile crane must be known before the price can be established. This second crane is known as an assist crane.

In addition to the mobile crane costs, there needs to be an erection crew who can guide and fasten into place the pieces being hoisted by the mobile crane company. The erection crew size can vary from four to eight ironworkers depending on the size and complexity of the crane installation.

Lastly are the incidentals or other factors that can greatly affect the cost of erection. Some of these considerations are:

Does the work have to be completed on the weekend?

If an urban site, are there street use fees to be paid for building the crane on public property?

Are there power or trolley lines to be temporarily (or permanently) moved in order to construct the crane?

Will the crane swing over a private neighbor’s property, and can a temporary easement be gained to allow that swing?

What types of inspections are required?

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