A regular pattern of bolts can be applied to the ends of the excavation, with the Add Bolt Pattern (End Support) option. The pattern location, bolt length and spacing can all be defined.
Note: on the ends of the excavation, you can only apply a single bolt pattern. You cannot apply multiple bolt patterns to the ends of the excavation.
To apply a pattern of bolts to the excavation ends:
First, make sure you are viewing the End Support Design view. Select the End Support Design View button from the toolbar. Note: if this button is disabled, make sure that the Compute End Wedges option is turned ON in Project Settings.
Select the Add Bolt Pattern option from the Sidebar or the Support menu.
You will see the Add Bolt Pattern (on Ends) dialog. In the dialog, enter the following information and select OK.
Bolt Properties - Assign the desired bolt property to the pattern. This will apply to all bolts in the pattern. Bolt properties are created and defined with the Bolt Properties option.
Bolt Length - The length of all bolts in the pattern. Note that the maximum apex height of the end wedges is listed in the dialog. You can use this as a guide for setting the bolt length.
Pattern Spacing - you can define the spacing of bolts independently in the Horizontal and Vertical directions. Note: "horizontal" and "vertical" refers to the local X and Y axes of the Opening Section, and not necessarily to the absolute horizontal and vertical directions, if your excavation is not horizontal (plunge = 0).
You will then be prompted to enter a point which defines the location of the pattern. The point can be anywhere inside the Opening Section boundary.
You can enter this graphically with the mouse (you will see a grid of dots representing the pattern, which follows the mouse movement), or
you can type the coordinates in the prompt line.
As soon as the point is entered, the bolt pattern will be added to the ends of the excavation. All bolts are installed normal to the plane of the Opening Section.
When a bolt pattern has been added to the ends of the excavation, the pattern will be displayed on the End Support Design View as a grid of points. To view the bolt length and pattern in 3-dimensions, use the 3D Wedge View or the End Wedge View.