How to Set String Top Level's/String Line alignment

Methodology

Setting Out:-
•Reference line of Carriageway will be marked at every 5mtr interval on DLC surface by
using Total station.

•String line of 3mm wire rope will be fixed on proposed PQC edge approximately 1.0-
1.5mtr away from the edge of the Pavement. This string line will be supported/anchored
by stakes at every 5mtr interval on both sides, at least 2 hours before laying and string
line will be set approximately 150mm above PQC top levels on each side on longitudinal
profile, on stakes placed 5mtr apart.

•The string wire shall be tensioned on the stakes so that a 500gms weight shall produce a
deflection of not more than 20mm when suspended at the midpoint between any pair of
stakes. To ensure the required tension of string wire, hand winches will be used to tighten
the string line to avoid any sagging. These winches will be placed at maximum 300mtr
intervals.

•The stakes shall be positioned and the string wire maintained/ tensioned at their correct
level/height and alignment as per relevant section drawings well before concreting takes
place.

•It shall be ensured that the stakes and guide wires are not affected by the construction
equipment when concreting is in progress.