superstructures assembly and erection part 1 Flashcards
When superstructure base plates are set on leveling nuts, the bottom of the nuts must be ? the concrete foundation.
no more than 1 1/2 bolt diameters above
A low profile substation superstructure is usually the ? type.
modular
Assembly of the ? type superstructure is the most time-consuming and complex.
lattice
The predominate finish for steel substation structures is ?
galvanizing
The standard grade for beam or lattice steel is typically ?
ASTM a36
The OSHA Construction Standards regarding steel erection are found in 1926 Subpart ?
r steel erection
The OSHA standard that covers steel erection only applies to office buildings.
false
Before steel erection begins, the supporting concrete foundations must be either ? of the intended minimum compressive design strength or of sufficient strength to support the loads imposed during steel construction.
75%
The type of substation superstructure that is considered aesthetically displeasing is the ? type.
lattice
When nuts are installed to bolted steel, the bolts should be long enough so that ?
at least two threads are seen protruding through the nut
No amount of reaming, chipping, or cutting is allowed for proper fitting of structural steel members.
false
Pipe and square tube sections of superstructures are normally constructed of ? steel.
ASTM A5 3rd grade b
The structure’s orientation, size, length, the number on it, and the proper torque of the connection bolts is shown on the ?
structural drawings
If leveling nuts are used on a foundation, it is easier to adjust them relative to each other after the structure is set.
false
Most new substation structures are ? , meaning a set of units is fitted together. Assembly and erection details are provided in the blueprints.
modular
