What is used to plumb up structural steel on site?

What is used to plumb up structural steel on site?

• A. Wire cable
• B. Tape measure
• C. Rope
• D. Chain

Answer: (A)

Plumbing up structural steel on site relies on a vertical reference line created by a plumb line. A weight hangs at the end of a line to let gravity pull the line true, giving a reliable vertical reference for aligning columns and other members. A wire rope serves well for this line because it is strong and relatively inelastic, so it doesn’t stretch or sag much under load and stays straight while you set or check alignment. Tape measures don’t establish verticality, they only measure distance. Rope can work as a line, but it can stretch and deform, reducing accuracy; chain is heavy and not suited for a precise vertical reference. So, a wire cable is the appropriate tool to plumb up on site.

Plumbing up structural steel on site relies on a vertical reference line created by a plumb line. A weight hangs at the end of a line to let gravity pull the line true, giving a reliable vertical reference for aligning columns and other members. A wire rope serves well for this line because it is strong and relatively inelastic, so it doesn’t stretch or sag much under load and stays straight while you set or check alignment. Tape measures don’t establish verticality, they only measure distance. Rope can work as a line, but it can stretch and deform, reducing accuracy; chain is heavy and not suited for a precise vertical reference. So, a wire cable is the appropriate tool to plumb up on site.