Chainage and offset setout notes

This function allows you to create setout notes to simplify the setting out of curves for underground mining. These setout notes are used to check the offsets from the line between two selected points to the left and right side of any new development. The setout notes contain perpendicular offsets at a specified interval along the line between two selected points to a design string. The design string will either represent a centre line or a roadway outline.

To run this function: Choose Inquire > Chainage and offset setout notes, or...

• In the Function Chooser, type CHAINAGE AND OFFSET SETOUT, and press ENTER.

Before you use this function you must have the string for which setout notes are required recalled into the Graphics module. This string will typically be the designed outline string of the new development.

You may also wish to use the Draw Survey Stations function to permit selected stations from your survey database to be displayed so that you can use existing stations as reference points for the setout notes.

Define the note file for setout data

The setout details will be written to a report file. You must enter the Location, Id Number and the Extension. The Description value which is entered is written to the report file to permit you to describe the setout notes which you are about to create. The Report writer is used to determine the format of the report file that is created.

Define the offset parameters

Length of setout

The value which is entered here is used to prevent an excessive amount of setout notes from being generated. This value is the maximum chainage at which the setout notes will be generated.

Setout interval

Enter the interval at which the setout notes are to be generated along the line between the selected points.

Offset Corridor

This value is to limit the setout notes which are generated. The offset corridor defines the maximum offset to the left or the right of the setout base line for the offset notes. Any points which have an offset greater than this value will not be included in the setout notes.

Complete the Chainage And Offset Setout Notes form to display the prompt:

Select backsight point

Position the cursor and select the point which is to be used as the backsight point.

Note: Any point at all may be used but you will find that it is most useful if you select a point which is a survey station that has been drawn from a survey database.

At the prompt:

Select setup point

Position the cursor and select the point which is to be used as the setup point.

Note: Any point at all may be used but you will find that it is most useful if you select a point which is a survey station that has been drawn from a survey database.

These two points define a base line from which the setout notes are referenced. The setup point is assumed to have a chainage of 0.0 and the positive chainage direction is measured away from the backsight station.

1. change = 0.0 2. backsight 3. setup 4. positive change

At the prompt:

Select a segment for chainage and offset setout

Position the cursor and select the string segment which is to have chainage and offset setout notes generated.

A report file containing the setout notes similar to the following example is created. A description of the setout notes which are created by this function and an explanation of how to interpret the notes follows.

The notes include details of the backsight and setup stations, their coordinates and the bearing and distance between them. The setout data to the selected string includes various items which are explained below. The notes give sufficient details from each of the stations to allow you to check the offsets from the line between the Backsight and Setup stations to the selected string.

The chainages are distances measured from the setup station in a direction away from the backsight station.

Chainage And Offset Setout Notes

Purpose: chainage and offset setout notes

Chainage The chainage is the distance measured from the setup station away from the backsight station. Because only positive chainages are included you can only create notes forward of the setup station.

Offset The offset is the perpendicular offset distance from the line between the backsight and setup stations. Negative values indicate a distance to the left of the line while positive values indicate a distance to the right of the line. The left and right are determined by looking in the direction of increasing chainage.

The Backsight and Setup points selected are the same. 
			This is not permitted. Please reselect the points.

The points which you selected as backsight and setup points have the same Y,X and Z values. This is not permitted. Try selecting the Backsight and Setup points again.