Find clashes in a model

You can use clash check to find clashes between reference model objects and pour objects, and between these objects and native Tekla Structures parts, and inside reference models and Tekla Structures models.

Check the model for clashes

On the Manage tab, click Clash check .
In the Clash Check Manager dialog box, select the appropriate clash check settings to determine what is included in the clash check.
- Between reference models
  
  Clashes between reference models are included in the clash check.
- Objects in reference models
  
  Clashes within reference models are included in the clash check (bolts and welds are not included).
- Between reference models and components
  
  Clashes between reference models and components are included in the clash check.
  
  When you have the whole component and this setting selected, the component parts are included in the clash check.
  
  Note that if you already have the Select objects in components selection switch active to select the parts in the component, the Between reference models and components setting does not have any effect, even if you have the check box selected in Clash Check Manager.
- Between parts
  
  Clashes between native Tekla Structures parts are included in the clash check.
Set the Minimum distance between reference model objects and pour objects, and between these objects and native Tekla Structures parts.

Objects that are closer to each other than the set minimum distance are reported in the clash check results. You can filter out minimum distance type clashes from the clash check results by setting the minimum distance value to 0.0.

You can define a minimum distance value within the range from 500 mm to -500.0 mm. With a negative minimum distance, you can define how much overlap is allowed without reporting a clash.

When checking the minimum distance, Clash Check Manager uses the Tekla Structures units set in File > Settings > Options > Units and decimals.

Note that Tekla Structures uses a hard-coded tolerance when checking clashes between native parts. If the native parts overlap less than 0.25 mm, clashes are not reported.
In the model, select the objects that you want to include in the clash check.
In the Clash Check Manager dialog box, click to check the objects.

The status bar in Clash Check Manager indicates that clash check is in progress.

Tekla Structures also displays a dialog box with a clash check progress bar. The progress bar first shows the clash check progress for Tekla Structures objects, and then for reference model objects and pours. You can cancel the clash check in the dialog box.

When the clash check is finished, the status bar in the Clash Check Manager dialog box shows a message about listing the clash check results and a progress bar that indicates how long it will take to list all the clashes. When the listing is complete, the status bar message changes to Ready.
If you want to include more objects in the clash check, select the desired model objects and re-run the clash check.

New clashes are appended to the end of the list.
After removing or modifying objects, re-run the clash check to see if the clash still exists.
1. Select the desired clashes in Clash Check Manager.
2. Click to re-run the clash check.

Note:

If you do not wish to check the entire model, you can use Organizer to select the sections and floors for which you want to run the clash check. Select a section or a floor in the category tree in Organizer, right-click and select Select in the model.

Note:

If you cannot find the clashes in the model, change the rendering of objects to Show only selected part (Ctrl+5) for better visibility.

Note that clashes are not detected if the profiles and positions are identical.

Symbols used in clash check

Clash Check Manager uses symbols to indicate the state of a clash.


Flag symbol	State	Description
(none)	Active	The default state. The clash is not new, modified, resolved, or missing.
	New	All clashes are marked as new when they are found for the first time.
	Modified	If the object has been modified (for example, if the profile has been changed), the state changes to modified when you re-run the clash check. Only certain object properties affect this flag. To see which properties have an effect, right-click one of the column headings. Both visible and hidden properties affect the flag.
	Resolved	If the objects no longer clash, the state changes to resolved when you re-run the clash check.
	Missing	If one or both of the clashing objects have been removed from the model, the state changes to missing when you re-run the clash check.

About clash types

Tekla Structures shows the type of each clash in the Type column in the Clash Check Manager dialog box.

The following clash types can occur:


Type	Description	Example
Clash	The object partly overlaps with another object.
Clash	Two identical objects overlap completely.
Clash	Objects intersect with each other in several locations.
Clash	The object cuts through another object.
Is inside	The object is inside another object.
Min distance	The objects are closer to each other than the defined minimum distance. The minimum distance is used between reference model objects and pour objects, and between these objects and native Tekla Structures parts. Minimum distance is not used between native Tekla Structures parts only.

Open and save clash check sessions

Clash check sessions are saved as .xml files in the ..\TeklaStructuresModels\<model>\Clashes folder. Tekla Structures creates the folder automatically when you open Clash Check Manager for the first time.

To open or save sessions in Clash Check Manager, do any of the following:


To	Do this
Save the current session	Click in the Clash Check Manager dialog box.
Open a session	Click in the Clash Check Manager dialog box. In the Open dialog box, select a session. Click Open.
Start a new session	Click in the Clash Check Manager dialog box. Clash Check Manager clears the list of clashes without running a clash check. If you already have clashes listed in the Clash Check Manager dialog box, selecting or clearing the check box of the Between reference models, Between reference models and components, Objects in reference models, Between parts, or Minimum distance setting will start a new clash check session. Tekla Structures displays a dialog box asking whether you want to save your current clash check session.
Save the current session with another name or in another location	Click the arrow next to the button in the Clash Check Manager dialog box. Click Save as . In the Save as dialog box, browse to the folder where you want to save the session. In the File name box, enter a new name. Click Save.
Save only selected clashes	In the Clash Check Manager dialog box, select the clashes that you want to save. Click the arrow next to the button. Click Save selected .