IfcPile

Definition from IAI: A slender timber, concrete, or steel structural element, driven, jetted, or otherwise embedded on end in the ground for the purpose of supporting a load.

HISTORY New entity in IFC Release 2x2

Geometry Use Definitions:

The geometric representation of IfcPile is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are:

Local Placement
The local placement for IfcPile is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that.
If the relative placement is not used, the absolute placement is defined within the world coordinate system.

Standard Geometric Representation using Swept Solid Representation
The standard geometric representation of IfcPile is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The following constraints apply to the standard representation:

Solid: IfcExtrudedAreaSolid shall be supported
Profile: IfcRectangleProfileDef and IfcCircleProfileDef shall be supported
Extrusion: The profile shall be extruded vertically, i.e., in the direction of the z-axis of the co-ordinate system of the referred spatial structure element. It might be further constraint to be in the direction of the global z-axis in implementers agreements. The extrusion axis shall be perpendicular to the swept profile, i.e. pointing into the direction of the z-axis of the Position of the IfcExtrudedAreaSolid.

Advanced Geometric Representation using CSG Representation
The advanced geometric representation of IfcPile is defined using the Swept Solid or CSG representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid' or 'CSG'. The following additional constraints apply to the advanced representation:

Solid: see standard geometric representation,
Profile: IfcRectangleProfileDef, IfcCircleProfileDef, IfcIshapeProfileDef and IfcArbitraryProfileDef shall be supported.
Extrusion: All extrusion directions shall be supported
Boolean result: The IfcBooleanClippingResult shall be supported, allowing for Boolean differences between the swept solid (here IfcExtrudedAreaSolid) and one or several IfcHalfSpaceSolid.

EXPRESS specification:

ENTITY IfcPile

SUBTYPE OF (

IfcBuildingElement);

PredefinedType

IfcPileTypeEnum;

ConstructionType

OPTIONAL IfcPileConstructionEnum;

WHERE

WR1

(PredefinedType <> IfcPileTypeEnum.USERDEFINED) OR ((PredefinedType = IfcPileTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType)) ;

END_ENTITY;

Attribute definitions:

PredefinedType	:	The predefined generic type of the pile according to function.
ConstructionType	:	General designator for how the pile is constructed.

Formal Propositions:

WR1

The attribute ObjectType shall be given, if the predefined type is set to USERDEFINED.

Inheritance graph

ENTITY IfcPile;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObjectDefinition;

INVERSE

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

IsDecomposedBy

SET OF IfcRelDecomposes FOR RelatingObject;

Decomposes

SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

ENTITY IfcObject;

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDefinedBy

SET OF IfcRelDefines FOR RelatedObjects;

ENTITY IfcProduct;

ObjectPlacement

OPTIONAL IfcObjectPlacement;

Representation

OPTIONAL IfcProductRepresentation;

INVERSE

ReferencedBy

SET OF IfcRelAssignsToProduct FOR RelatingProduct;

ENTITY IfcElement;

Tag

OPTIONAL IfcIdentifier;

INVERSE

FillsVoids

SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;

ConnectedTo

SET OF IfcRelConnectsElements FOR RelatingElement;

HasCoverings

SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;

HasProjections

SET OF IfcRelProjectsElement FOR RelatingElement;

HasStructuralMember

SET OF IfcRelConnectsStructuralElement FOR RelatingElement;

ReferencedInStructures

SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;

HasPorts

SET OF IfcRelConnectsPortToElement FOR RelatedElement;

HasOpenings

SET OF IfcRelVoidsElement FOR RelatingBuildingElement;

IsConnectionRealization

SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;

ProvidesBoundaries

SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;

ConnectedFrom

SET OF IfcRelConnectsElements FOR RelatedElement;

ContainedInStructure

SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

ENTITY IfcBuildingElement;

ENTITY IfcPile;

PredefinedType

IfcPileTypeEnum;

ConstructionType

OPTIONAL IfcPileConstructionEnum;

END_ENTITY;