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Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

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invert and the string line. Specially designed instrumentsare available which incorporate a measuringtape, extendable arm and leveling device. Theseinstruments are based on the same principle, buteliminate the need to construct batter boards andsupports and are portable.The transfer of surface control points to stakesalong the trench bottom is sometimes necessarybecause of the deep trenches or unstable soils requiringthe trench sides to be sloped back. Stakesshould be set along the trench bottom at 50 ft. (15m) intervals and a string line drawn between twoEXAMPLE BATTER BOARD SET-UPBatterBoardGradeStringGradeStakeGrade Rod RegisteringGrade of InvertGrade Rod RegisteringGrade of Trench16American <strong>Concrete</strong> <strong>Pipe</strong> Association • www.concrete-pipe.org

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