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Analys av felkällor vid mängdavtagning av ventilationssystem ur BIM-modeller
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2014 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Analysis of error sources in quantity take off in ventilation systems from BIM models (English)
Abstract [sv]

De senaste åren har det skett stora framsteg i byggbranschen från sedvanlig byggprojektering till avancerad BIM-projektering. Resultatet av denna studie visar att trots den hastiga utvecklingen så utförs det fortfarande mängdavtagningar ur 2D-ritningar. Detta på grund av problem som uppstår vid mängdavtagningar ur objektbaserade 3D-modeller. Mängdlistorna ur objektbaserade 3D-modeller stämmer inte alltid överens med mängdlistorna ur 2D-ritningar. Detta leder i sin tur till nödvändiga och tidskrävande manuella mängdavtagningskontroller ur pappersritningar. Detta för att säkerhetsställa den riktiga mängden. Ju större projekten blir, desto mer tid tar det att utföra de manuella mängdavtagningskontrollerna.

 Syftet har varit att lokalisera och analysera de olika felkällorna som uppkommer vid mängdavtagningar. Mängdavtagningsfunktionen i programmet RevitMEP (2014) och MagiCAD (2013.11) undersöktes. Resultatet jämfördes med manuella mängdavtagningar ur 2D-ritningar.        

Examensarbetet resulterade i en arbetsmodell som visar hur man på ett korrekt sätt utför mängdavtagningar ur 3D-modeller. Vinsten av detta blir att färre återkommande fel uppstår. Det är viktigt att ha ett välstrukturerat och tydligt arbetssätt vid användning av de olika BIM-verktygen. Vid användning av modellen blir det färre fel och minskad missförstånd uppstår vid projektering. Kontinuerliga mängdavtagningar bör genomföras för att så tidigt som möjligt möjliggöra upptäckten av fel. Att upptäcka felen i ett tidigt skede förhindrar att felet eskalerar. I studien påträffades även ett kritiskt programmeringsfel i programmet MagiCAD för Revit MEP vilket ger användaren felaktiga resultat. Problemet har påpekats till programutvecklaren CADCOM och korrigering av programmet kommer att ske.

Abstract [en]

The past years there have been vast progresses within the construction industry from traditional construction projection method to a more advanced BIM-projecting method. The results of this dissertation shows that in spite of these vast progresses it is still commonly conducted manual quantity calculations with 2D-drawings. The main reason to this is that when you compare the quantity results from object based 3D models to manual quantity calculation results with 2D-drawing, the results do not add up being equal to each other. Hence time consuming manual quantity calculations with paper drawings has to be conducted to verify the real material quantity. The larger the project, the more time is consumed to conduct manual calculation verification.

The aim has been to identify and analyze the different sources of error arising from manual calculation verification. In assistance we used the quantity calculation functions in the software RevitMEP (2014) and MagiCAD (2013.11). To substantiate the results manual calculations were conducted. The results were compared to the manual calculations from 2D drawings, the profit of the method is that we get less reoccurring errors.

The gain of this is resulting in fewer recurring of errors. It is important to have a well-structured and clear approach with the use of the various BIM tools. When using the model, there are fewer errors and reduced misunderstandings arise during project planning. Continuous calculation verifications should be implemented as early as possible to allow the discovery of errors. Detecting errors in the early stage will prevent the error from escalating. The study also found a critical programming error in the program MagiCAD for Revit which gives the user false results. The problem has been pointed out to the application developer CADCOM and correction of the program will occur.

Place, publisher, year, edition, pages
2014. , 54 p.
Keyword [en]
quantity, Revit MEP, MagiCAD, BIM, error sources
Keyword [sv]
mängdavtagning, Revit MEP, MagiCAD, BIM, felkälla
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-147538OAI: oai:DiVA.org:kth-147538DiVA: diva2:730390
External cooperation
Helenius Ingenjörsbyrå AB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Supervisors
Examiners
Available from: 2014-06-27 Created: 2014-06-27 Last updated: 2014-06-27Bibliographically approved

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