Definition
A Plumb Bob (commonly called a "Sahaal" on Indian sites) is an ancient but indispensable surveying tool. It consists of a dense, pointed metal weight suspended from a string. Driven purely by gravity, the string instantly creates a perfectly vertical line (a plumb line). It is the primary tool used by masons and carpenters to ensure walls and formwork are built perfectly straight up and down.
Practical Example
A carpenter is erecting a 3-meter tall wooden column formwork. Before tightening the final braces, they drop a Plumb Bob down the side of the wood. If the distance from the string to the wood is 2 inches at the top but only 1 inch at the bottom, they know the formwork is leaning heavily and must be readjusted before the concrete is poured.
Application in Superwise
Checking for plumbness is a mandatory step in quality control. The Superwise Pre-Pour QA checklist requires the site engineer to digitally sign off that they personally checked the formwork with a plumb bob. Taking a photo of the plumb line aligned with the shuttering and uploading it to the checklist creates undeniable proof of quality.
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