A Two Track Cantilever (TTC) is a type of structure. Due to a TTC being associated with two tracks there are some differences from the steps in How to add a Structure.
Step 1: Place a marker
Place a circle to act as a marker for the position you would like to place the structure.
Step 2: Navigate to the 'Wires' section on the Lineardraft toolbar
Step 3: Click the 'Place' button
Step 4: Click the marker
This should be the marker you placed in Step 1.
Step 5: Right click
This will allow placement of a Single Mast Structure. If you are looking to place a Portal Structure please see: How to create a Portal.
Step 6: Click the Left Rail
This should be the leftmost rail of the tracks you wish the structure to be associated with when looking in the direction of increasing chainage.
Step 7: Click the Right Rail
This should be the rightmost rail of the tracks you wish the structure to be associated with when looking in the direction of increasing chainage.
Step 8: Enter 'Structure Details'
The following 'Create Structure' form will appear. Complete the 'Structure Details' section with a name and the chainage that the structure should be located at. If required, enable the 'Secondary Chainage' field by ticking the checkbox and input a value.
Name: Identifier for the structure.
Chainage: Chainage value that the structure should be placed at in kilometres.
Secondary Chainage (optional): Additional chainage value, useful as a reference in projects which interface with additional chainage systems.
Step 9: Select Mast Style
From the drop-down menu, select the Mast Style you would like to allocate.
Step 10: Select Gantry Style and Foundation Style
From the drop-down menu, select the Gantry Style and Foundation Style you would like to allocate.
Step 11: Configure Mast
Adjust values for the Mast Length, Mast Bearing, and RECOS/REFOS.
Length: Length of the Mast in metres
Bearing: Rotation of the Mast in degrees measured from North (0°)
RECOS: Distance from the centre of steel to the running edge of the closest rail in metres
REFOS: Distance from the face of steel to the running edge of the closest rail in metres
Step 12: Configure Foundation
Adjust values for the Gap, ToF, Foundation Length and Foundation Bearing.
Gap: Spacing between the Top of Foundation and base of the Mast in metres.
ToF: Top of Foundation height above sea level in metres (By default this value will be set to the HRL).
Length: Length of the Foundation in metres.
Bearing: Rotation of the Foundation in degrees measured from North (0°).
If you’re working with a mast and foundation combination which requires an adapter plate, the relevant fields will become available to you, as seen in the image below.
Select an adapter plate from the dropdown list and adjust values for the Top Gap, Bottom Gap, ToF, Foundation Length and Foundation Bearing.
Top Gap: Spacing between the Top of the Adapter Plate and base of the Mast in metres.
Bottom Gap: Spacing between the Top of Foundation and base of the Adapter Plate in metres.
ToF: Top of Foundation height above sea level in metres (By default this value will be set to the HRL).
Length: Length of the Foundation in metres.
Bearing: Rotation of the Foundation in degrees measured from North (0°).
Top Tip: Learn more about designing with adapter plates here.
Step 13: Configure Gantry
Adjust values for the Gantry Height and Gantry Length.
Height: Distance between the HRL and bottom of the Gantry in metres
Length: Length of the Gantry in metres
Step 14: Click 'Confirm'
This will close the 'Create Structure' form.
Step 15: Confirm the structure has been placed correctly
You can now check that Lineardraft has placed a structure, which will be visible in both the 3D and Plan views.
