# Civil Setout
# Chainage Pegs
Chainage pegs determine where you are in reference to a design line.
Pegs should be placed at whole number chainages which are referenced in the cross sections. Speak to the supervisor on site to determine this spacing, for example every 15/40/50m spacing.
Place the offset peg outside the work boundary and write the chainage. Potentially add in any other requested offsets on the peg as well.
# Kerbs/Paths
Usually completed in 2 stages; boxing out and then before kerb is laid.
Boxing out stage involves placing setout pegs at a specified offset where there are deviations in alignment of the kerb. Typically this will be 1m from the Back of Kerb then Cut/Fill symbol is written on the peg.
See the example below. Flagging tape should be wrapped around the top of the peg.
1.5m Prism pole is suitable for this work. Where noting the depth place the mashie hammer on the ground take note of the value and measure up to a round number.
This value should be the same for all the pegs so that contractors can use a stringline between pegs and easily measure off them to see that they have prepared to the area correctly. ***** Diagram
Concrete Preparation involves pinning out the Lip of Kerb/Edge of Path. Galvanised Iron Nails/Roofing Nails are used to inform the concreters of the FSL of the concrete.
Stakeout the Lip of Kerb/Edge of Path and pin out any deviation in direction, tangent points or interval of 10m.
Mini Prism is to be used to achieve high accuracy in horizontal and vertical. Aim for +/-2mm to the line. ****Diagram
# Batters/Swale Inverts
Similar to boxing out pegs for kerb. Place pegs outside the extent of the swale, and give a cut value to the invert and edge of the swale.
Stake out the invert of the swale or top/toe of the batter, place an peg at an Offset which is outside of the work area and write on the peg the OS and Cut/Fill value. In the same position stake out the invert and write on the peg the OS and Cut/Fill value. Where multiple lines are staked out be clear what each value is referring to. 1.5m prism pole is suitable for this work.
Where noting the depth place the mashie hammer on the ground take note of the value and measure up to a round number. This value should be the same for all the pegs so that contractors can use a stringline between pegs and easily measure off them to see that they have prepared to the area correctly.
****Diagram
# FSL/Pavement Layers/Subgrade Surface Model
This is undertaken usually during profiling stages of Asphalting or when machine control is not used on a project. You will spray up cut/fill levels on the ground to the required pavement depth.
Stakeout the applicable surface model. Add through the map layers then use the Stakeout DTM method in Trimble Access. If needed apply a vertical offset to the surface. Spray on the ground the cut/fill value, for example +120, -50
TIP
Important Note - be clear with the machine operator if they want levels from the FSL or values to a specific depth below FSL. IE for a 200 below FSL and the ground is at 180 it could be +180 (to FSL) or -20 (to 200 below FSL).
Also within Trimble Access be aware that the vertical offset stays applied to the DTM until it is changed.
# Drainage – Pits
Pits can be setout in multiple ways which is why you need to check with the contractor before setting them out.
The most common is to give 2 offset pegs in the same direction as each other. For example, 3 and 5m. Then when they are landing the pit you may need to either spray up or peg out the kerb alignment.
To setout pits, add the drainage DXF to the map window in trimble access. At the center of the pit you will see 2 lines perpendicular to each other with the corner at the centre of the pit. These give the orientation of the pit and use them to add in the offset pegs. The line direction should be from the center of the pit and the station on the line will be the offset.
For a level typically we will give the outlet invert of the pipe but this is dependent on the contractor. Create a CUT mark on the peg for this value. *********** Diagram
# Drainage – Pipes/Culverts
Pipes and culverts require an offset peg with the CUT value to the invert of the pipe.
Add the drainage DXF into your map window. Select the line and place the peg in a suitable location to the side of the trench.
WARNING
Be aware of the difference between staking out a line and a point. Points will give the same RL no matter where you are.
Lines will give you the RL at the station on the line. If you extend beyond the end of the line the RL on trimble access will be an extension of the grade from the line.
**** Diagram ********