To place a mid-point anchor (MPA) on a gantry, just follow these steps. Please note these instructions require you to have first placed a portal, created a catenary wire, and attached it to the portal.
Step 1: Click the 'Edit' button in the 'Structures' section of the Lineardraft toolbar
This will open the structure selection window.
Step 2: Click on the structure you want to add the MPA to and click 'Edit'
Alternatively, you can select your structure from the drop-down menu. Clicking 'Edit' will open the 'Edit Structure' window.
Step 3: Click on the 'Wires' tab
Step 4: Click the catenary wire to which you want to add the MPA
This will open the 'Edit Wire' dialog.
Top tip: You can also access a wire point by clicking 'Edit' in the 'Wires' section of the Lineardraft toolbar, choosing the required wire, and then clicking the appropriate wire point in the 'Wire points' tab.
Step 5: Change the support type to 'MPA on Gantry'
Step 6: If required, adjust the 'Contact Wire' height to manipulate the system height
It is not possible to adjust the system height or messenger wire height directly for an 'MPA on Gantry', as they are dictated by the height of the gantry. This is why you adjust the 'Contact Wire' instead. Click here to find out more.
Top tip: You can also adjust the gantry height to manipulate the system height, either from the 'Gantry' sub-menu of the 'Edit Wire' dialog, or the 'Steelwork' tab of the 'Edit Structure' window.
Step 7: Enable the 'Equipment' toggle
This will expand the 'Edit Wire' dialog.
Step 8: Click on the available 'Gantry' followed by the 'Add SPS' button
Alternatively you can click on the 'Add SPS' button next to the chosen gantry. This will add SPS to the equipment pathway.
Step 9: Select the SPS you want and adjust the position using with either 'Offset from support' or 'Distance from wire'
Step 10: Click 'Drop tube' in the equipment pathway, review the 'Type' and settings
Top tip: Your drop tube settings (length and position/height) are defined automatically. To override these settings, follow this article.
Step 11: Click 'Add Bracket' and select the 'Type' required
This will add a bracket to the equipment pathway, along with the number of wire support slots defined by the bracket.
Step 12: Click a wire support slot, then select the wire support 'Type' and 'Style' you require
You can edit any applicable wire support style parameters by clicking the 'Customisation' drop-down.
Please note: If no wire supports are available upon clicking a wire support slot, you may need to adjust your reach by changing your SPS or drop tube offset, or system height by changing your contact wire height or gantry height, so an applicable wire support can be added.
Step 13: Click 'Apply', then click 'Update Structure'
This will close the 'Edit Wire' dialog, then the 'Edit Structure' window, and confirm your selections.
Please note: Some MPA on gantry arrangements contain components that need to be added as in-span equipment. To find out how to do this, follow this step-by-step guide.