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Building Design and Construction Handbook - Merritt - Ventech!

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STRUCTURAL STEEL CONSTRUCTION 7.119<br />

FIGURE 7.60 Clearance for beam seated on<br />

column-web connections.<br />

material on the lower end of the upper shaft, if erection of the beam precedes<br />

erection of the column in the tier above.<br />

7.40 ERECTION SEQUENCE<br />

The order in which steel is to be fabricated <strong>and</strong> delivered to the site should be<br />

planned in advance so as not to conflict with the erector’s methods or construction<br />

schedule. For example, if steel is to be erected with derricks, the approximate<br />

locations at which the derricks will be placed will determine the shipping installments,<br />

or sections, into which the frame as a whole must be segregated for orderly<br />

shipment. When installments are delivered to the site at predetermined locations,<br />

proper planning will eliminate unnecessary reh<strong>and</strong>ling. Information should be conveyed<br />

to the drafting room so that the shipping installments can be indicated on<br />

the erection plans <strong>and</strong> installments identified on the shipping lists.<br />

In erection of multistory buildings with guy derricks, the practice is to hoist <strong>and</strong><br />

place all columns in each story first, sp<strong>and</strong>rel beams <strong>and</strong> wall bracing next, <strong>and</strong><br />

interior beams <strong>and</strong> wall bracing next, <strong>and</strong> interior beams with filler beams last.<br />

More specifically, erection commences with bays most distant from the derrick <strong>and</strong><br />

progresses toward the derrick, until it is closed in. Then, the derrick is jumped to<br />

the top <strong>and</strong> the process is repeated for the next tier. Usually, the top of the tier is<br />

planked over to obtain a working platform for the erectors <strong>and</strong> also to afford protection<br />

for the trades working below. However, before the derrick is jumped, the<br />

corner panels are plumbed; similarly when panels are erected across the building,<br />

cables are stretched to plumb the structure.

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