> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/precast-i-girder-bridge-workflow/substructure-pig/abutment-system-pig/sleeper-slab-head-wall-pig.md).

# Sleeper Slab Head Wall \[PIG]

For the modeled sleeper slabs, sleeper slab head walls can be modeled as a separate object using this object of the workflow.

## General

**Sleeper Slab:** This parameter is used to specify the sleeper slab for which the sleeper slab head wall will be modeled.

**Longitudinal Offset:** The sleeper slab head wall will have its center located at the center of the selected sleeper slab when a value of 0 is used for the longitudinal offset definition. Negative values will offset the sleeper slab head wall in the downstation direction, while positive values will offset the sleeper slab head wall in the upstation direction.

**Material:** This parameter can be used to assign a material to the sleeper slab. Materials can be selected from previously defined options under **Properties-Materials** or imported as needed.

**Length:** This parameter is used to specify the length of the sleeper slab head wall in the longitudinal direction. For a visual representation, refer to the figure provided below.

**Width:** This parameter is used to specify the width of the sleeper slab head wall in the transverse direction. For a visual representation, refer to the figure provided below.

**Thickness:** This parameter is used to specify the thickness of the sleeper slab head wall in the vertical direction. For a visual representation, refer to the figure provided below.

**Secondary Slab Width Extension:** Additional transverse width added to the head wall beyond its primary width; used when the head wall extends past the sleeper slab edge.

**Left Secondary Slab Start Skew Angle:** Skew angle at the start (downstation) end of the left secondary extension region.

**Left Secondary Slab End Skew Angle:** Skew angle at the end (upstation) end of the left secondary extension region.

**Right Secondary Slab Start Skew Angle:** Skew angle at the start (downstation) end of the right secondary extension region.

**Right Secondary Slab End Skew Angle:** Skew angle at the end (upstation) end of the right secondary extension region.

![image-20250115-134910.png](https://openbrim.atlassian.net/wiki/download/attachments/2879520828/image-20250115-134910.png?api=v2)

## IFC

**Type:** The IFC entity type for BIM export. Available options include:

* IfcSlab (default)
* IfcWall
* IfcBuildingElementProxy

**Predefined Type:** The IFC Predefined Type is specified using this parameter. Available options include:

* APPROACH\_SLAB (default)
* BASESLAB
* FLOOR
* LANDING
* PAVING
* SIDEWALK
* WEARING
* USERDEFINED
* NOTDEFINED

**Parent \[Bridge/Superstructure/Deck/Substructure/Foundation/Approach\_Structure/Retaining\_Structure]:** The IFC Parent is specified using this parameter to define the hierarchy relationship in the IFC model.

## Quantities

**Volume:** Based on the definitions provided by the user, the volume of the object is calculated and presented in this column. (Read-only)

**Weight:** The total weight of the sleeper slab head wall based on volume and material density. (Read-only)


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