710
4.2 Variant 2 – Modular tendering
With this variant the tendering would take place as in Variant 1. In addition, the subcontractors receive a production and time orientated set of data with the offer. In this case the
subcontractors should support the production planning to optimize the project. As a prerequisite the subcontractors need to have suitable BIM skills or need to procure the support of a
BIM (planning) manager
18
. This variant could be applied for earth works and raw/structural
construction works, but also partially for MEP works.
4.3 Variant 3 – IPD (Integrated Project Delivery)
With a planning- and optimization process under BIM involvement the available possibilities
can be used best of all when all partners, i.e. all essential executive companies—are integrated at
a very early stage into the process and maintain a high level of BIM skills and extensive knowledge of methodology and processes involved. This early and comprehensive involvement of the
executing companies is called IPD and requires that the subcontractors receive a production
and time orientated set of data with the offer as in Variant 2. The subcontractors should support the production planning to optimize the project supported by a capable BIM (planning)
manager
19 .
The biggest challenge for IPD is to allocate contracts for the execution of construction if the
contents of the building works are not defined at all. It must be proven that the best value for
money is maintained. A lot of trust for the client has to be built up for this variant, because a
competitive situation is maintained only during the selection procedure. It has to be made sure
that the best in the market is selected for a specific job. Therefore, great importance has to be
given to the selection procedure under the direction of the project management. The trust of
the client into the know—how, the experience and the integrity of the project manager has to
be earned
20
.
5 CASE STUDY AT HOCHTIEF POLSKA
HOCHTIEF Polska started to implement BIM by end of 2016 with initial staff training and
development of general guidance for BIM use. In a next step BIM was piloted on a design &
build project in Warsaw, followed by application for structural design in the Technical Office
of the Warsaw Branch. These steps enabled to implement BIM as a pilot for project execution starting April 2018.
A suitable project was found with acquisition of Airport Traffic Control Centre in Poznan.
The project comprises design & build of a two-story office building with basement, Gross
Floor Area (GFA) 10.000 m
2
. Structural construction, partly executed with prefabricated
concrete elements and steel structures, all M&E works (without equipment and external services) and roads were included in the contract (lump sum EUR 20.5 m).
The client Polish Air Navigation Services Agency (Polska Agencja Żeglugi Powietrznej,
PAZP) is responsible for functional description of the works, HOCHTIEF for full execution
design.
The proposed project execution period of 19 months consists of:
• 8 months for successive preparation of complete execution design including
• 3 months for building permit design preparation (including all required approvals) and
2 months for receiving of building permit
• 9 months for works execution (one shift per day anticipated)
• 3 months for take-over procedure and receiving of occupancy permit.
18. Ibid., p. 152.
19. Ibid., p. 152.
20. Ibid., p. 153.
4.2 Variant 2 – Modular tendering
With this variant the tendering would take place as in Variant 1. In addition, the subcontractors receive a production and time orientated set of data with the offer. In this case the
subcontractors should support the production planning to optimize the project. As a prerequisite the subcontractors need to have suitable BIM skills or need to procure the support of a
BIM (planning) manager
18
. This variant could be applied for earth works and raw/structural
construction works, but also partially for MEP works.
4.3 Variant 3 – IPD (Integrated Project Delivery)
With a planning- and optimization process under BIM involvement the available possibilities
can be used best of all when all partners, i.e. all essential executive companies—are integrated at
a very early stage into the process and maintain a high level of BIM skills and extensive knowledge of methodology and processes involved. This early and comprehensive involvement of the
executing companies is called IPD and requires that the subcontractors receive a production
and time orientated set of data with the offer as in Variant 2. The subcontractors should support the production planning to optimize the project supported by a capable BIM (planning)
manager
19 .
The biggest challenge for IPD is to allocate contracts for the execution of construction if the
contents of the building works are not defined at all. It must be proven that the best value for
money is maintained. A lot of trust for the client has to be built up for this variant, because a
competitive situation is maintained only during the selection procedure. It has to be made sure
that the best in the market is selected for a specific job. Therefore, great importance has to be
given to the selection procedure under the direction of the project management. The trust of
the client into the know—how, the experience and the integrity of the project manager has to
be earned
20
.
5 CASE STUDY AT HOCHTIEF POLSKA
HOCHTIEF Polska started to implement BIM by end of 2016 with initial staff training and
development of general guidance for BIM use. In a next step BIM was piloted on a design &
build project in Warsaw, followed by application for structural design in the Technical Office
of the Warsaw Branch. These steps enabled to implement BIM as a pilot for project execution starting April 2018.
A suitable project was found with acquisition of Airport Traffic Control Centre in Poznan.
The project comprises design & build of a two-story office building with basement, Gross
Floor Area (GFA) 10.000 m
2
. Structural construction, partly executed with prefabricated
concrete elements and steel structures, all M&E works (without equipment and external services) and roads were included in the contract (lump sum EUR 20.5 m).
The client Polish Air Navigation Services Agency (Polska Agencja Żeglugi Powietrznej,
PAZP) is responsible for functional description of the works, HOCHTIEF for full execution
design.
The proposed project execution period of 19 months consists of:
• 8 months for successive preparation of complete execution design including
• 3 months for building permit design preparation (including all required approvals) and
2 months for receiving of building permit
• 9 months for works execution (one shift per day anticipated)
• 3 months for take-over procedure and receiving of occupancy permit.
18. Ibid., p. 152.
19. Ibid., p. 152.
20. Ibid., p. 153.