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Hollow Core Opening Tool

Last updated March 12, 2019 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 

Hollow Core Opening Tool

Hollow Core Opening Tool

Hollow Core Opening Tool creates holes and recesses to hollow core slabs. Hollow Core Opening Tool works with single hollow core slabs, or with floors that are created with the Modeling of floor bay (66) modeling tool.

Objects created

  • Holes and recesses

Use for



Hollow core slab with small and large openings


Hollow Core Opening Tool calculates the location for the openings based on the given values and the slabplate that represents a concrete structure

In Tekla Structures, a slab is created by picking three or more points.

Slab may be part of a floor, for example.

profile data. If needed, you can use an external configuration file in XML format to provide different rules for the openings and the slab profile data.

You can define small and large openings. Small openings are placed in the middle of the hollow cores so that no webs are broken. Large openings break webs.

Before you start

Create a hollow core slab.

Selection order

  1. Select the main part(1) part that exists in a building object and that determines the position number for the assembly or cast unit and the direction of assembly or cast unit drawings

    (1) Main part can be an assembly main part or a cast unit main part.

    (2) input part that the user selects first when creating a component

    (2) Connections and details always have a component main part.


  2. Pick a position for the opening.

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