impact of 4d modeling on construction planning process - Chalmers ...

Because <strong>of</strong> the adoption <strong>of</strong> the BIM based processes by the contractor in the early
stages <strong>of</strong> its development, there were several challenges faced. But the contractor
never looked backed and adopted BIM based processes as their standard way <strong>of</strong> doing
business in many areas.
3.3.3 Case study 3 (Eastman, Teicholz, Sacks, & Liston, 2011)
This case study covers construction <strong>of</strong> the bridge in the city <strong>of</strong> Helsinki, Finland. The
construction <strong>of</strong> the bridge started in the fall <strong>of</strong> 2008 and was scheduled to complete by
late 2010. Because the design <strong>of</strong> bridge incorporated heavy steel work and there was a
need for accuracy, the designer recommended the use <strong>of</strong> <strong>modeling</strong> for the project. The
client decided to adopt <strong>modeling</strong> not just for the steel parts, but all other construction
works, including time and management dimensions. The initial model <strong>of</strong> the bridge
was prepared by the designers, but the contractor used the same model and added to it
and edited it to use it for the construction process. Following are the different ways in
which the model was used for construction management.
Visualization
Design and Planning <strong>of</strong> Temporary Structures
Clash Detection
4D Construction Planning
Fabrication and Installation <strong>of</strong> Structural Steel Components
Rebar Detailing, Fabrication, and Installation
Laser Scanning
The model was used very productively for work and activity sequencing, and for
viewing the work. The 3D model helped different parties involved in the project to
better understand the details and concept <strong>of</strong> the design, enabling a common
understanding and mental picture to evolve far more quickly than with traditional 2D
drawings and documents. Through <strong>modeling</strong> the temporary structures including
scaffolding, formwork, tower cranes and other temporary structures, a better
understanding <strong>of</strong> the construction process and structures was developed. This enabled
identification <strong>of</strong> various conflicts, and effective planning <strong>of</strong> temporary works along
with the implementation <strong>of</strong> 4D planning.
The 4D model enabled the team to develop more accurate and detailed work plan then
they would have achieved with the traditional methods. It provided actual spatial
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