When setting up batter boards for a building foundation, what is the primary purpose of the string lines stretched between the boards?
Correct Answer
A) To mark the exact location of foundation walls and ensure square corners
Batter boards with string lines are used to establish the precise location and alignment of foundation walls, ensuring the building is square and properly positioned according to the site plan.
Why This Is the Correct Answer
Batter boards with string lines serve as the primary layout tool for foundation construction. The strings stretched between batter boards mark the exact perimeter of foundation walls, establish building corners, and ensure the structure is square and properly aligned. This system allows contractors to accurately transfer the building dimensions from plans to the construction site, maintaining precise positioning throughout the excavation and foundation pouring process.
Why the Other Options Are Wrong
Option B: To provide temporary support for concrete forms
String lines on batter boards are not structural support elements. Concrete forms are supported by their own bracing systems, stakes, and ties. The lightweight string lines lack the strength and rigidity needed to provide any meaningful support for heavy concrete forms during pouring operations.
Option D: To mark utility line locations for excavation safety
Utility line locations are marked using utility locating services and spray paint or flags directly on the ground. Batter board strings are positioned above ground level for building layout and would not effectively mark underground utility positions for excavation safety purposes.
Memory Technique
Remember 'BATS' - Batter boards And Their Strings mark building layout and ensure square corners, like a baseball diamond's precise corner positioning.
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