Clash
detection is a popular term among AEC firms. It is 3D graphic that
permits for the inherent exposure of inconsistencies in early phase of
the design. Detecting inconsistencies is very important, as these can
provide serious effect on the construction progression, result in
delays, design modifications, materials costs and budget overruns.
The
constructability issues are solved in earlier stage of construction and
it saves huge amount of money, time which lead to creating a superior
building.
Clash detection is a part and parcel of the BIM modeling
system. In BIM modeling process, there is not a single model but
various models are incorporated into a combined master model. Each
discipline ranging from structural engineering, MEP engineering,
environmental engineering, etc makes a model independently on the basis
of the architect’s original model. It is the starting point for all the
other disciplines. Once each of the disciplines completes their work,
the next stage in BIM modeling is clash detection.
Therefore, clear conception on clash and how to apply clash detection factors in BIM
software is vital for engineers, architects, owners and contractors. It
is found that each recognized clash saves $17,000 approximately on a
project.
Clash
detection is also considered to be an effective teaching tool that
facilitates the students to find out prospective mistakes devoid of
spending wasteful time searching through 2D drawings.
Generally there are three types of clashes:
- Hard clash
- Soft Clash/Clearance Clash
- 4D/Workflow Clash
Hard Clash:
A hard clash occurs when two objects take up the identical space. For
example, a beam is going through where a plumbing run is designed. As
information is implanted in the BIM modeling
objects, hard clash provides geometry based detection as well as
semantic and rule-based detection algorithms. Geometry based clash
detection will restore a clash for every recessed ceiling light, or a
pipe going through a wall. But if clash detection rules are created on
the basis of embedded object data, it can reduce these types of general
errors. The level of detail and selection sets plays an important role
in BIM modeling
for the accurateness and effectiveness of clash detection by performing
clash detection amid definite subsets of a model.
Soft Clash:
Soft clashes denote objects that require positive spatial/geometric
tolerances, spaces and buffers inside their buffer zone for access,
insulation, maintenance or safety. Soft clashes create new possibilities
where BIM modeling
clash detection brings new potential to the method. Custom “soft clash”
detection can be applied for testing components for building code
adherence.
4D/Workflow clash:
4D/Workflow clash detection can determine scheduling clashes for work
crews, equipment/materials fabrication & delivery clashes and other
project timeline issues through a BIM modeling project.
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Published By
Rajib Dey
www.bimoutsourcing.com
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