6.3.3.9 IfcMechanicalFastener

Mechanisches Befestigungsmittel

A mechanical fasteners connecting building elements mechanically. A single instance of this class may represent one or many of actual mechanical fasteners, for example an array of bolts or a row of nails.

HISTORY  New entity in IFC2x2
IFC4 CHANGE  Supertype changed from IfcFastener to IfcElementComponent. Attribute PredefinedType added. Attributes NominalDiameter and NominalLength deprecated.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 230.
Type
IfcMechanicalFastenerType

Table 230 — IfcMechanicalFastener Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 231.
PredefinedTypeName
ANCHORBOLTPset_MechanicalFastenerAnchorBolt
BOLTPset_MechanicalFastenerBolt
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 231 — IfcMechanicalFastener Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 232.
Name
Qto_MechanicalFastenerBaseQuantities

Table 232 — IfcMechanicalFastener Quantity Sets




XSD Specification:

 <xs:element name="IfcMechanicalFastener" type="ifc:IfcMechanicalFastener" substitutionGroup="ifc:IfcElementComponent" nillable="true"/>
 <xs:complexType name="IfcMechanicalFastener">
  <xs:complexContent>
   <xs:extension base="ifc:IfcElementComponent">
    <xs:attribute name="NominalDiameter" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="NominalLength" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="PredefinedType" type="ifc:IfcMechanicalFastenerTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcMechanicalFastener
SUBTYPE OF IfcElementComponent;
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
NominalLength : OPTIONAL IfcPositiveLengthMeasure;
PredefinedType : OPTIONAL IfcMechanicalFastenerTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcMechanicalFastenerTypeEnum.USERDEFINED) OR ((PredefinedType = IfcMechanicalFastenerTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCSHAREDCOMPONENTELEMENTS.IFCMECHANICALFASTENERTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

NominalDiameter : The nominal diameter describing the cross-section size of the fastener type.
IFC4 CHANGE  Deprecated; the respective attribute of IfcMechanicalFastenerType should be used instead.
NominalLength : The nominal length describing the longitudinal dimensions of the fastener type.
IFC4 CHANGE  Deprecated; the respective attribute of IfcMechanicalFastenerType should be used instead.
PredefinedType : Subtype of mechanical fastener

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcMechanicalFastenerType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : If this occurrence is defined by a type object, the latter has to be an IfcMechanicalFastenerType.

Inheritance Graph:

ENTITY IfcMechanicalFastener
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties 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;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
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 IfcElementComponent
ENTITY IfcMechanicalFastener
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
NominalLength : OPTIONAL IfcPositiveLengthMeasure;
PredefinedType : OPTIONAL IfcMechanicalFastenerTypeEnum;
END_ENTITY;

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