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4. Setting out-Tape and Offset Methods -Simple Curves Download

There are 3 methods by which pegs on the centreline of circular curves can be set out:1.Tangential angle method2.

Setting out-Tape and Offset Methods -Simple Curves Screenshots

Setting out-Tape and Offset Methods -Simple Curves Editor's review

There are 3 methods by which pegs on the centreline of circular curves can be set out:1.Tangential angle method2.

Offsets from the tangent lengths 3.

Offsets from the long chordWhen traditional methods are being used it is first necessary to locate the intersection and tangent points of a curve. This procedure is carried out as follows:

Locate the two straights AC and BD and define them with at least two pegs on the ground for each straight. Use nails in the tops of the pegs to define them precisely.Set up a theodolite over the nail in a peg on one of the straights (say AC) and sight the nail in another peg on AC so that the theodolite is pointing in the direction of intersection point IDrive two additional pegs x and y on AC such that straight BD will intersect the line xy. Again use nails in x and y for precisionJoin the nails in the tops of pegs x and y using a string line.Move the theodolite and set it up over a peg on BD, then sight the other peg on BD so that the telescope is again pointing at I.Fix the position of I by driving a peg where the line of sight from the theodolite on BD intersects the string line xy.Move the theodolite to I and measure the angle AIB. Calculate the deflection angle , from = 180o angle AIB.

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