709
drawings
14 to create a Procurement Work Package. In the next step the procurement team
generates quantity take offs (QTO’s) from the entire model, leading to an order of raw materials to site. A Procurement Work Package can also be allocated as a lumpsum package to
subcontractors transferring all risks in relation to execution of the package to the engaged
subcontractor.
Contents of a Procurement Work Package are in principle detailed specifications of
requirements for suppliers and vendors consisting of
– Scope statement
15 ,
– Material Matrix,
– Fabrication Drawings and
– 3D Model.
To satisfy the data requirements for a fully attributed 3D model, the procurement team
will need to establish contractual obligations for vendors, suppliers and fabricators to supply comprehensive data along with their products. Figure 3 shows a simplified chart of the
procurement process
16 .
This described holistic approach requires optimized involvement of subcontractors into
the processes, which must be contractually secured. The subcontractors need to participate
in general contractor sponsored work schedule coordination for design and execution of all
works. The program starts before actual construction on site or in its initial phase and later
shortly before installation of the specific works in a more detailed manner. In principle there
are three variants procuring with BIM:
4.1 Variant 1 – Standard tendering with quantities and BIM
On the base of a BIM—planning model the Bill of Quantities (BoQ) will be established under
consideration of partial lists/extracts from modelling as a base. The BIM BoQs differ from
classical BoQs as they are more detailed. This can cause additional expenditure for the subcontractors, if they are not used to tender modules. The advantages for the general contractor
is that he receives a module price and could “play” with the quantification derived from the
data base accordingly. With this rather trivial kind of tendering the possibilities of BIM would
be used rather rudimentary
17 . At present this variant works for all earth and raw construction
works.
14. Fabrication drawings: A component of the EWP that is the complete list of equipment steel or pipe
drawings that need to be fabricated for a single CWP.
15. Scope Statement: A description of the procurement scope and strategy for the acquisition of components and the fabrication of any kind of equipment, steel or pipe, along with the common delivery date.
16. After G. Ryan.
17. Projektmanagement im Hochbau, von Hans Sommer, Springer-Verlag Berlin Heidelberg, 2016, p. 152.
Figure 3. Procurement process.
drawings
14 to create a Procurement Work Package. In the next step the procurement team
generates quantity take offs (QTO’s) from the entire model, leading to an order of raw materials to site. A Procurement Work Package can also be allocated as a lumpsum package to
subcontractors transferring all risks in relation to execution of the package to the engaged
subcontractor.
Contents of a Procurement Work Package are in principle detailed specifications of
requirements for suppliers and vendors consisting of
– Scope statement
15 ,
– Material Matrix,
– Fabrication Drawings and
– 3D Model.
To satisfy the data requirements for a fully attributed 3D model, the procurement team
will need to establish contractual obligations for vendors, suppliers and fabricators to supply comprehensive data along with their products. Figure 3 shows a simplified chart of the
procurement process
16 .
This described holistic approach requires optimized involvement of subcontractors into
the processes, which must be contractually secured. The subcontractors need to participate
in general contractor sponsored work schedule coordination for design and execution of all
works. The program starts before actual construction on site or in its initial phase and later
shortly before installation of the specific works in a more detailed manner. In principle there
are three variants procuring with BIM:
4.1 Variant 1 – Standard tendering with quantities and BIM
On the base of a BIM—planning model the Bill of Quantities (BoQ) will be established under
consideration of partial lists/extracts from modelling as a base. The BIM BoQs differ from
classical BoQs as they are more detailed. This can cause additional expenditure for the subcontractors, if they are not used to tender modules. The advantages for the general contractor
is that he receives a module price and could “play” with the quantification derived from the
data base accordingly. With this rather trivial kind of tendering the possibilities of BIM would
be used rather rudimentary
17 . At present this variant works for all earth and raw construction
works.
14. Fabrication drawings: A component of the EWP that is the complete list of equipment steel or pipe
drawings that need to be fabricated for a single CWP.
15. Scope Statement: A description of the procurement scope and strategy for the acquisition of components and the fabrication of any kind of equipment, steel or pipe, along with the common delivery date.
16. After G. Ryan.
17. Projektmanagement im Hochbau, von Hans Sommer, Springer-Verlag Berlin Heidelberg, 2016, p. 152.
Figure 3. Procurement process.