For Android: 4.1 and up | Guide: Setting out-Tape and Offset Methods -Simple Curves cheats tutorial |
When updated: 2020-09-09 | Star Rating: 0 |
Name: Setting out-Tape and Offset Methods -Simple Curves hack for android | Extension: Apk |
Author: Franz Tette Okyere | File Name: com.sit.simplecurves |
Current Version: 1.0 | User Rating: Everyone |
Downloads: 50-51 | Version: mod, apk, unlock |
System: Android | Type: Education |
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There are 3 ways 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 ways are being used it is first important 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 other peg on AC so that the theodolite is pointing in the direction of intersection point IDrive two extra pegs x and y on AC such that straight BD will intersect the line xy. Once more 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 another peg on BD so that the telescope is once more 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 θ, from θ = 180o– angle AIB. Calculate the tangent lengths IT and IU using [R tan (θ/2)]. Fix points T and U by measuring back along the straights from I.Check the setting out angle ITU which could equal to (θ/2).Locating I, T and U with two InstrumentsIn some cases it may not be possible to locate a theodolite on point I due to inaccessibility of some type. In this case the place of I and the tangent points can be carried out using two theodolites. The procedure in this case is as follows: Select two points A and B somewhere on the straights such that it is possible to sight A to B and B to A and also to measure AB.Measure ABMeasure the angles α and β, calculate λ from λ = 180 – (α + β) and receive θ from θ = (α + β).Use the sine rule to calculate IA and IB Calculate the tangent lengths IT and IU using [R tan (θ/2)].Using AT = IA – IT and BU = IB – IU set out T from A and U from B. If possible check that ITU is equal to (θ/2) Setting Out Using Tangential AnglesThis is the most accurate way of the traditional ways for setting out curves. It can be done using a theodolite and tape, two theodolites or a total station and pole reflector.The formula used to determine the tangential angles is derived as follows: Using a Theodolite and tapeIn this way a theodolite is set up at the tangent point and used to turn the tangential angles to define the directions to each centre line peg. The exact positions of these pegs are fixed by measuring with a tape from peg to peg in sequence. The exact calculation and setting out procedures are as follows:Setting out Procedure:Using the ways described previously, the tangent points are fixed and the theodolite is set up at one of them.
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