![]() ![]() ![]() The negative offset denotes that point is to the left of the centerline and the convention (when considering roads that is) is to consider everything as we look up chainage.įrom the above information a Site Engineer would need to use trigonometry to work out the Whole Circle Bearing (WCB) and the distance between the Centerline and the two channels. That is, it should be presented in a format of point name, easting, northing, elevation, offset from the Centerline, for every 10m (minimum) Chainage intervals and every tangent point. This should be in the format of cross-sectional information. ![]() The site engineer would also have to calculate the elevations for the profile boards at positions 2 and 4, and check the easting and northing position for the these profile boards too, these should be the same as the easting and northing positions for points 1 and 3.įirst you need to look through the (supplied from the designer) proposed road data. So to offset the plane of the LHS ( Left Hand Side) of the carriageway, the site engineer would need to work out points 1 and 3 in the below diagram, and for this the site engineer would need to calculate the easting, northing and elevation for both points.Īt this point the site engineer would only have information (easting, northing and elevation) for the centreline point and the channel (Face of the Kerb) point from which to calculate these offset points. This adds a further complication to the calculations that need to be done. The profiles also need to be set at a distance beyond the edge of the proposed edge of the road construction. What the site engineer needs to do is calculate the plane of the road and offset it vertically so the site operatives can see the “traveller”. In the example shown in the image below, we can see a cross-section through a typical proposed road. This of course is presuming that the site is not using Machine Control for this construction activity. One of the first jobs a Site Engineer will have to undertake on a new Road Construction Job is to work out the positions and levels of the profiles that will be used to control the line and level of the proposed road. Double Headed Profiles Being Used for Controlling Formation Trim ![]()
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