Building Information Modeling (BIM) is an innovative technology that aims to improve the construction sector by radically changing the modus operandi to be considered the "Copernican revolution" in the construction sector. The main objective of BIM is not only to make all the various freelancers in sector collaborate with each other, but also to ensure transparency of the process. All various disciplines have benefited from the advent of BIM in a different way, from architecture to structural engineering to MEP engineering. Nevertheless, the process of estimating project costs and the consequent financial management, have not had the same growth as the above-mentioned disciplines. With the use of BIM methodology it is possible to automate the process of accounting for the quantities, to proceed with their extraction and to create the estimated bill of quantities. However, this operation has some limitations and requires an in-depth study to solve them. Before going into more detail, this paper analyses the state of the art of using BIM methodology for automatic extraction of quantities from the model, presenting its essence, advantages, limits and the different levels of adoption in the world. This automatic extraction of quantities from a BIM model is called Quantity Take-Off (QTO). Subsequently, the procedure for the realization of QTO is presented using BIM methodology, proposing an automatism to manage the export of data and the consequent realization of bill of quantities. The requirements necessary to model the elements will be analysed in order to obtain a quantity accounting consistent with the measurement criteria. Finally, two case studies of residential buildings built will be shown, for which the various progress reports have been collected in order to reconstruct the final balance paid for the works construction. Once this was achieved, two BIM models were created and, following the procedure described, bill of quantities were drawn up and then compared and analysed with the results.
Il Building Information Modeling (BIM) è una tecnologia innovativa che ha lo scopo di migliorare il settore dell’edilizia cambiando in modo talmente radicale il modus operandi da essere considerata la “rivoluzione copernicana” del settore delle costruzioni. L’obiettivo principale del BIM è quello non solo di far collaborare tra loro tutti i vari professionisti del settore, ma anche di garantire la trasparenza del processo. Tutte le varie discipline hanno beneficiato dell’avvento del BIM in maniera diversa, dall’architettonica passando per quella strutturale, fino a quella impiantistica. Malgrado ciò, il processo di stima dei costi di progetto e la conseguente gestione finanziaria, non hanno avuto la stessa crescita delle sopra citate discipline. Con l’utilizzo della metodologia BIM è possibile automatizzare il processo di contabilizzazione delle quantità, procedere con la loro estrazione e creare il computo metrico estimativo. Tuttavia, questa operazione presenta alcuni limiti e necessita di uno studio approfondito per risolverli. Questa trattazione, prima di addentrarsi nello specifico, analizza lo stato dell’arte riguardo all’uso della metodologia BIM per l’estrazione automatica delle quantità dal modello presentando la sua essenza, i vantaggi, i limiti e i diversi livelli di adozione nel mondo. Tale estrazione automatica delle quantità da un modello BIM prende il nome di Quantity Take-Off (QTO). Successivamente viene presentata la procedura di realizzazione del QTO con l’utilizzo della metodologia BIM proponendo un automatismo per gestire l’esportazione dei dati e la conseguente realizzazione del computo metrico. Verranno analizzati i requisiti necessari per effettuare la modellazione degli elementi in modo consono ad ottenere una contabilizzazione delle quantità coerente con i criteri di misurazione. Infine, verranno mostrati due casi studio di edifici residenziali realizzati, per i quali sono stati raccolti i vari stati di avanzamento lavori in modo da ricostruire il consuntivo pagato per la realizzazione delle opere. Ottenuto ciò, sono stati creati due modelli BIM e, seguendo la procedura descritta, sono stati redatti i computi metrici successivamente confrontati ed analizzati con i consuntivi finali.
Automazione del quantity take-off con metodologia BIM
BERTANI, DAVIDE
2018/2019
Abstract
Building Information Modeling (BIM) is an innovative technology that aims to improve the construction sector by radically changing the modus operandi to be considered the "Copernican revolution" in the construction sector. The main objective of BIM is not only to make all the various freelancers in sector collaborate with each other, but also to ensure transparency of the process. All various disciplines have benefited from the advent of BIM in a different way, from architecture to structural engineering to MEP engineering. Nevertheless, the process of estimating project costs and the consequent financial management, have not had the same growth as the above-mentioned disciplines. With the use of BIM methodology it is possible to automate the process of accounting for the quantities, to proceed with their extraction and to create the estimated bill of quantities. However, this operation has some limitations and requires an in-depth study to solve them. Before going into more detail, this paper analyses the state of the art of using BIM methodology for automatic extraction of quantities from the model, presenting its essence, advantages, limits and the different levels of adoption in the world. This automatic extraction of quantities from a BIM model is called Quantity Take-Off (QTO). Subsequently, the procedure for the realization of QTO is presented using BIM methodology, proposing an automatism to manage the export of data and the consequent realization of bill of quantities. The requirements necessary to model the elements will be analysed in order to obtain a quantity accounting consistent with the measurement criteria. Finally, two case studies of residential buildings built will be shown, for which the various progress reports have been collected in order to reconstruct the final balance paid for the works construction. Once this was achieved, two BIM models were created and, following the procedure described, bill of quantities were drawn up and then compared and analysed with the results.| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/150785