Prefabrication of pipes

The BIM overall coordinator provides the reference model. In most cases, this is the architecture model.

The validation rules define the specifications for validating whether the defined pipe networks are correctly modelled and the attributes correctly enriched in accordance with the information request.

The BIM overall coordinator provides the specialist planner with the agreed modelling guidelines.

The following attributes are provided for in terms of modeling guidelines in project planning:

• Trade (e.g. plumbing)
• Description of medium (e.g. cold water mains pressure)
• Pipe material (e.g. stainless steel 1.4401)
• Fitting description (e.g. elbow 45°)
• Pipe diameter (e.g. DN 50)
• Numbering system for the tender (CSBD, IGH, etc.)

modeling guideline with attribute list for reference model

The building technology model author models the existing pipe networks in the project. This could include:

• Plumbing: supply lines (e.g. cold and warm water pipes)
• Plumbing: waste lines (e.g. wastewater and rainwater pipes)
• Plumbing: industrial facilities (e.g. compressed air lines, natural gas lines or other media transported in pipes)
• Heating: flow and return pipes
• Cooling: flow and return pipes

Contiguous parametric pipe networks are to be planned in the models.

Enriching the model components using the attribute list in the information request

The attributes have been imported into the project plan according to the information request.

The following attributes are provided for in terms of modeling guidelines in project planning:

• Trade (e.g. plumbing)
• Description of medium (e.g. cold water mains pressure)
• Pipe material (e.g. stainless steel 1.4401)
• Fitting description (e.g. elbow 45°)
• Pipe diameter (e.g. DN 50)
• Numbering system for the tender (CSBD, IGH, etc.)

Coordination of the individual technical and component models of BIM projects with multiple disciplines or companies. This includes the merging of digital building models into coordination models as well as the formal and functional evaluation of the digital building models using predetermined rules. This must be done on the overall direction level and can be supplemented by the BIM coordination within individual technical disciplines.

Decision whether the model quality is sufficient for the defined requirements. If the quality is insufficient, a revision must be commissioned. If the quality requirements are fulfilled, the model is provided to the technical planner for further processing.

If the technical models are available in the desired model quality and the attribute list is complete, the model can be used to create the tender.

The Information Delivery Milestone consists of the following business processes and information exchange requirements:

Specialist Model Project Planning

• er_1 reference model with modeling guidelines
• er_2 technical model

Enriching the pipe network with manufacturer data

er_2 from design phase additionally with the selected manufacturer and pipe system

The following attributes are included in the execution plan:

• Trade (e.g. plumbing)
• Description of medium (e.g. cold water mains pressure)
• Pipe material (e.g. stainless steel 1.4401)
• Fitting description (e.g. elbow 45°)
• Pipe diameter (e.g. DN 50)
• Numbering system for the tender (CSBD, IGH, etc.)
• Manufacturer
• Pipe system

Decision whether the model quality is sufficient for the defined requirements. If the quality is insufficient, a revision must be commissioned. If the quality requirements are fulfilled, the model is provided to the technical planner for further processing.

Provision of the construction schedule as well as delivery and logistics specifications

Provision of the following documents

The construction schedule must include the following information:

• Sub-projects incl. dates (if any)
• Construction phases incl. dates (or work package)
• Note: Later 4D planning if any

The delivery and logistics specifications must contain the following information:

• Maximum access size (if any)
• Maximum weight per delivery unit
• Time window for delivery (if any)

In the work planning process, the contractor processes the model such that it can be prefabricated for construction in the required work cycles. The information request and construction schedule are required for this.

Like er_2 but with additional data

The following attributes are provided for in execution planning:

• Trade (e.g. plumbing)
• Description of medium (e.g. cold water mains pressure)
• Pipe material (e.g. stainless steel 1.4401)
• Fitting description (e.g. elbow 45°)
• Pipe diameter (e.g. DN 50)
• Numbering system for the tender (CSBD, IGH, etc.)
• Manufacturer
• Sub-project or work package assignment (e.g. LOT A, basement)
• Part numbering (installation logic from work preparation, e.g. 1_5_16_R)
• Centre-to-centre length of each pipe section
• Order numbers of the supplier or manufacturer

Coordination of the individual technical and component models of BIM projects with multiple disciplines or companies. This includes the merging of digital building models into coordination models as well as the formal and functional evaluation of the digital building models using predetermined rules. This must be done on the overall direction level and can be supplemented by the BIM coordination within individual technical disciplines.

Decision whether the model quality is sufficient for the defined requirements. If the quality is insufficient, a revision must be commissioned. If the quality requirements are fulfilled, the model is provided to the technical planner for further processing.

The approved execution model is transmitted to the manufacturer.

Supported formats:

• IFC 2x3
• IFC 4.0
• Excel
• CSV

Based on the approved execution model, the manufacturer creates an offer

The Information Delivery Milestone consists of the following business processes and information exchange requirements:

Specialist model with manufacturer data

• er_2 model

Technical Model Execution Planning

• er_3 planning documents
• er_4 Execution Model

The contractor places the order with the manufacturer or supplier.

Like er_3 but with additional data

The delivery and logistics requirements must receive the following information:

• Maximum input sizes (if available)
• Maximum weight per delivery bundle
• Time window for delivery (if available)
• Delivery date
• Contact person
• Advice number

The manufacturer segments the information for planning the prefabrication process. This includes price calculation, cutaway planning, final length calculation, delivery lots, etc.

Decision whether the technical models will be supplemented with information from the supplier / manufacturer

The manufacturer or supplier optionally adds request information.

• Examples of this include maintenance intervals or spare parts

Like er_4 with additional data

The following attributes are included in the execution plan:

• Trade (e.g. plumbing)
• Description of medium (e.g. cold water mains pressure)
• Pipe material (e.g. stainless steel 1.4401)
• Fitting description (e.g. elbow 45°)
• Pipe diameter (e.g. DN 50)
• Numbering system for the tender (CSBD, IGH, etc.)
• Manufacturer
• Sub-project or work package assignment (e.g. LOT A, basement)
• Part numbering (installation logic from work preparation, e.g. 1_5_16_R)
• Center-to-center length of each pipe section
• Order numbers of the supplier or manufacturer
• Optional information from the supplier / manufacturer

Coordination of the individual technical and component models of BIM projects with multiple disciplines or companies. This includes the merging of digital building models into coordination models as well as the formal and functional evaluation of the digital building models using predetermined rules. This must be done on the overall direction level and can be supplemented by the BIM coordination within individual technical disciplines.

Decision whether the model quality is sufficient for the defined requirements. If the quality is insufficient, a revision must be commissioned. If the quality requirements are fulfilled, the model is provided to the technical planner for further processing.

Decision whether the execution model for production or installation at the construction site is approved

The pipes are prefabricated according to specifications. This process step can be done at the contractor’s or the manufacturer’s / supplier’s location

Pipes are installed at the construction site according to the numbering logic

The Information Delivery Milestone consists of the following business processes and information exchange requirements:

Execution Model Project Planning

• er_5 delivery and logistics requirements
• er_6 execution model for construction site