Building Superintendence for Steel Structures; A Practical Work on the Duties of a Building Superintendent for Steel-Frame Buildings, and the Proper Methods of Handling the Materials and Construction (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ... men to operate it properly and economically; therefore the proper number of men employed on a given piece of work is determined by the number of derricks or machines used on that work. The reach or length of boom must also be decided upon. The longer the boom of a given cross-section, the less load the derrick can pick up. It is advisable, too, that all parts of the structure be reached with as few moves of the derricks as possible, as every move takes time and costs money. Derrick Layout. If the structure to be erected is a building, a convenient way of arriving at a good derrick layout is to make a plan to scale of the derrick which the contractor would like to use and cut this from cardboard. Place this on the general setting plan of the typical floor, and move it around until the best location is determined upon. In doing this, it must be kept in mind that proper supports for the mast must be provided for, and also proper places of sufficient strength to which the guys or ends of stiff legs can be anchored. If these supports and anchor places can be found in the structure already erected, then a minimum of such work as shoring is required, and an expense in the moving of the derricks saved. Bridge Traveler. Often when the structure to be erected is an important bridge, the engineer who designs it also designs the traveler or whatever method is to be employed in the erection. By doing this, he makes sure that the contractor will not put undue and unnecessary strain upon the structure during the construction. Locomotive Crane. It is usual to employ a locomotive crane or derrick car whenever the work is of such nature that it can be reached from a railroad track already in place or which can easily be put in place. A locomotive crane, however, is an expen...