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A Ciribini & G Galimberti

4D Project Planning and H&S Management

Abstract: A The European Client Organisations must face huge responsibilities by 92/57/EC Directive when the Health and Safety Management System has to be built in. Moreover, Public Client Organisations are trying, in different ways, to cope with such duties in modifying their Project Execution Plans over time so to update project schedules and reports complying with H&S Plan-related measures. The researchers have performed a detailed analysis which should allow Project Sponsors and Project Managers to deal with Time Management following a safety-oriented approach.

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Full text: content.pdf (505,136 bytes) (available to registered users only)

Series: w78:2005 (browse)
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Permission to reproduce these papers has been graciously provided by the Technische Universität Dresden.


Aalami F, Fischer M

Joint product and process model elaboration based on construction method models

Abstract: In practice, construction planners need to plan and replan projects at several levels of detail and would like create 4D visualizations to communicate construction schedules. The current construction planning and scheduling process is , however, still largely manual and time-consuming, making it difficult to maintain an appropriate and realistic set of plans, schedules, and 4D visualizations throughout design and construction. Researchers have demonstrated the usefulness of a product model with a decomposition hierarchy and supported-by relationships between project components to generate a construction process model automatically. The product model's decomposition hierarchy supports the generation of hierarchical activities, and the supported-by relationships between components enable automated reasoning. However, the resulting process model is typically not a usable or realistic construction schedule, since activities can only be sequenced if elaborated to the same level of detail, and component-based activity elaboration is limited to the original product model. This paper discusses how a customizable and general representation of construction method models supports the transformation of a design-centric product model into a production-centric view. A formalized hierarchical construction planning process forms the basis of this translation process. The planning process is broken down into method-driven elaboration and hierarchical planning and scheduling steps. User-defined and user-selected construction method models drive the elaboration process by supplying the necessary activity and component elaboration knowledge. The product model undergoes a transformation from a design-centric decomposition to a production-centric decomposition. The elaborated activities are sequenced based on constraints that are passed on to the activities from their construction methods. The output of the planning process is a 4D production model. A 4D production model is a linked representation of an elaborated product and process models. A 4D production model is a flexible representation of the construction process that can support many views for communication and evaluation, e.g., 4D visualization, CPM-network, barchart, or resource histograms.

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Full text: content.pdf (289,626 bytes) (available to registered users only)

Series: w78:1998 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.represent (0.035804) class.processing (0.027755) class.communication (0.018300)
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Permission to reproduce these papers has been graciously provided by Royal Institute of Technology, Stockholm, Sweden. The assistance of the editors, Prof. Bo-Christer Björk and Dr. Adina Jägbeck, is gratefully appreciated.


Akbas R, Fischer M, Kunz J, Schwegler B

Use of domain knowledge, product models and geometric algorithms for generation of construction zones

Abstract: We present a layered approach for automated generation of construction zones from 3D CAD models for construction planning and scheduling. The existence of 3D models and product models provides an opportunity for planners and schedulers to consider zoning alternatives and represent and visualize production information in detail. Construction zones are spaces, or groups of spaces, which serve as units of work in the construction planning process. Failure to define construction zones properly may increase overall project duration and impact workflow adversely. Today, zone definitions are generally ad-hoc. Formal definitions and mechanisms to generate construction zone information are not available in commercially available software.We have defined a three-layer computational framework in a prototype construction management software tool to generate detailed information about construction zones. The framework separates the construction-based information from the product model representation and geometric information. Each layer is extensible and testable without the other layers. The highest layer (Layer3) contains domain knowledge about zones, i.e., types of zones and factors or constraints affecting construction zone definition. For example, a shape factor takes into account the changes in production rates due to local variations of geometry. The shape factor also allows the representation of an idle crew because of a nearby activity, missing support or unavailability of materials. Layer 2 manages the changes in the product and process models that are necessary to generate zones. Additionally, it uses zoning knowledge to maintain consistent schedules at multiple levels of detail. Layer 1 is the geometric level that contains the geometric algorithms to create the subdivisions and aggregations using the geometric shape representation of the building components. Instead of considering a fixed geometric representation for a component, we provide a flexible triangular mesh shape representation, breaking-up or aggregating component geometry as necessary. With the results of this research, professionals will be able to simulate and visualize construction processes more accurately and link design and construction data more tightly to explore design-build scenarios rapidly and communicate them effectively.

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Full text: content.pdf (1,076,021 bytes) (available to registered users only)

Series: w78:2001 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.impact (0.028985) class.environment (0.026386) class.represent (0.022098)
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Permission to reproduce these documents have been graciously provided by CSIR Building and Construction Technology. The assistance of the editors, Mr. Gustav Coetzee and Mr. Frances Boshoff, is gratefully appreciated.


Aleš Mrkela & Danijel Rebolj

Automated construction schedule creation using project information model

Abstract: In this paper we will propose a method of using a project information model (PIM) for creating construction schedules. In the paper we will briefly review current available scheduling possibilities, which use combination of BIM and scheduling software. We realized that BIM lacks user specific data that is vital for proper schedule creation and has, on the other hand, too complex structure and software tools for planning personnel to understand. Through the use of simple 3D model viewer, user specific data and BIM, we are proposing a novel approach of schedule estimation in construction, which we call project information model (PIM). PIM is the process that is based on internal logics, that creates the estimated schedule and resource usage. After the PIM process, the automatically created schedule is included in BIM and made available to project managers and other construction stakeholders, to coordinate and carry out activities.

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Full text: content.pdf (279,466 bytes) (available to registered users only)

Series: w78:2009 (browse)
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Andersson N

Re-engineering of the project planning processstrategic implementation of project management software

Abstract: This paper presents a model for re-engineering of the project planning process frombeing manually performed to be computer supported. The primary objective of thisstudy is to facilitate the implementation of project management software packages inorder to make use of the full potential of the software. Earlier studies show that thecurrent use of computer supported planning among project managers of buildingprojects is focused on print-out of schedules and the use of more advanced planningfunctions is limited. This study shows that only education and support is notsufficiently for project managers to adopt computer supported planning. Successfulimplementation of project management software also requires clear objectives of thecomputer supported planning and specified requirements and requisite level ofplanning details. This paper presents an approach on a strategic implementation ofcomputer supported project planning on basis of the surplus values related to the useof project management software. The results are based upon a case study at one ofSweden's largest construction companies.

Keywords: Computer support, project management, project managers, project planning,scheduling, software implementation, software support, surplus value.

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Full text: content.pdf (61,829 bytes) (available to registered users only)

Series: w78:1997 (browse)
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Bergsten S, Knutsson M

4D CAD- an efficient tool to improve production method for integration of apartments in existing buildings

Abstract: This paper describes an ongoing research project on application of a 4D CAD tool for design and production planning of vertical extensions of existing buildings (over-roofing) in Stockholm city, for creation of a more densely populated city as the demand for apartments in the city centre increases. 4D CAD is a concept, which combines an object oriented 3D CAD model with time. 4D CAD is a kind of information visualisation that is easier to understand than traditional methods, such as 2D drawings and time schedules, which are used to manage construction projects. 4D CAD is a logical way of imaging a construction management tool. It is a tool that is conceptually much closer to an intuitive picture of a construction process than 2D drawings and time schedules. The 4D concept is developed at Stanford University and to support the concept researchers at Stanford have developed a prototype that is being used in some complex construction projects in California. The focus of the research project “Integration of apartments in existing buildings by use of Light Gauge Steel Framing”, which this paper is a part of it, is to improve production methods in order to reduce design, planning and construction time for conversions of, and extensions to existing buildings in the city centres. A way to improve the production methods is by utilising a 4D planning process in combination with industrialised production of building components. Extensions to existing buildings are due to the demand for new apartments in attractive locations in the city centres and shortage of land for housing in city centres. The Light Gauge Steel constructions have many benefits for conversions of, and extensions to existing buildings. According to research results the Light Gauge Steel Framing system is suitable for industrial production. This building system results in a very light weight building compared with traditional materials e.g. concrete which makes it suitable for over-roofing extensions. The materials used in the Light Gauge Steel Systems is thin steel members, plaster boards and mineral wool. Many of the problems, which occur during vertical extensions of existing buildings today, are solved when they are discovered, that is sometimes on the site. Some examples of these problems are poor compatibility between the existing building (structural components and material) and the Light Gauge Steel Framing, detail solutions of the building components, shafts and piping for ventilation, water, sewage and drainage etc. It is less expensive to discover and to correct errors at an early stage compared to solving them on the site. Further a lot of construction time will be saved, which will decrease the disturbance on existing surroundings. Several problems have to be considered in the planning process in order to minimise the disturbance on existing activities and surroundings. This could be done by the use of a 4D CAD planning tool. An over-roofing project located in the city means that the land to use during the production period is limited and expensive. Thereby is the logistic to and from the site more complicated. Consequently the site management and logistic of building components to the building site and their storage on the site is most important. In fact the 4D concept is an efficient planning tool to organise the logistic of the site during the planning phase instead of as today during the production. The site layout can be simulated and visualised with a 4D CAD tool for the actors in the project which in particular will help the site engineer to organise the activities, material flow and site logistic. The value of using the 4D CAD concept is studied by comparing the traditional planning process of a number of over-roofing projects in Sweden with the planning process of the 4D CAD concept. This paper discusses how a 4D CAD tool together with an industrialised production method can be used for improving the production process for an over-roofing project in order to reduce the construction time and with secured quality. The reader will understand and appreciate the added value in form of a more efficient way of managing construction projects.

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Full text: content.pdf (708,786 bytes) (available to registered users only)

Series: w78:2001 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.022264) class.impact (0.010607) class.software development (0.010605)
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Permission to reproduce these documents have been graciously provided by CSIR Building and Construction Technology. The assistance of the editors, Mr. Gustav Coetzee and Mr. Frances Boshoff, is gratefully appreciated.


Bügler M,Dori G,Borrmann A

Swap based process schedule optimization using discrete-event simulation

Abstract: Large construction projects usually involve many tasks, which are connected through dependencies and usage of common resources and materials. Determining the optimal order of task execution is in most of the cases impossible to do by hand. Therefore different methods for automatic optimization of large process schedules using a discrete-event simulation system were investigated. This paper introduces a new heuristic method for the resource constrained project scheduling problem, called swap-based optimization. Compared to creating an optimal schedule from scratch, the swap approach facilitates obtaining metrics about the performance of the result, before having worked through the entire construction process. Swaps are introduced into the simulation model by assigning priorities to the tasks. After running a simulation a list of possible swaps is created. Applying one of them and restarting the simulation will introduce a change into the sequence of the tasks within the schedule, generating a different schedule than the one before. Different tree search algorithms, traversing the space of possible swaps throughout a construction process, were analyzed. The suitability of the method is proven by an extensive case study.

Keywords: Resource Constrained Project Scheduling Problem,Project Schedule Optimization,Discrete-event Simulation,Task Swaps,Construction Site,Tree search

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Series: convr:2013 (browse)
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Can Ersen F?rat, Juhani Kiiras, Kalle Kähkönen, Pekka Huovinen

Model based scheduling in building projects – is it oxymoron?

Abstract: In building, most projects are still planned and scheduled based on the randomly accumulated, contextual experience among planners and managers. The key inputs for scheduling tasks, i.e. the dependencies, man-hours, and durations of activities may have never been organized well in the focal planner’s mind. The aim of the paper is to intro-duce some new viable ways of modeling scheduling activities in the context of building based on the integration of a product model, a process model, and complementary IT solutions. The integrative rationale of the new Building Con-struction Information Model (BCIM) is herein justified in terms of combining the building product model, the building construction resource and cost model, and the building construction process model. Some new feasible ways of auto-mating building project planning are explored, in particular in terms of using template schedules to automate schedul-ing activities as part of the advancement and exploitation of the suggested BCIM.

Keywords: building projects, information technology, modeling, process models, product models, scheduling

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Full text: content.pdf (759,119 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Dado E, Tolman F

Support of site construction processes by product data technology

Abstract: In the last decade or so design/engineering of building and construction projects is gradually incorporating advanced information technologies, like Product Data Technology. The main drive for this development comes from the demand for meaningful electronic communication between CAxx systems of various disciplines. Getting rid of the islands of automation and information improves both the design processes and the design results. However islands of automation and information not only exist in design/engineering, but also in the construction phase. Moreover the design/engineering and the construction faces as a whole, are still very much isolated. Now that in the foreseeable future main contractors will receive a complete project description, a product model, in electronic format, the question becomes important how PDT can support site construction. In recent studies, researchers in the field of planning, scheduling and cost-estimating of construction projects, discerned the importance of the ability to deal with explicit information about construction methods and technologies is an important capability for future support systems. The main idea is that experiences and knowledge from earlier construction projects are stored in construction methods. By representing these construction methods in a standardized electronic form (i.e. databases, objects), an organization, such as a main contractor, is able to exchange information with other organizations and allows an organization to assemble a repository of techniques which they are familiar with. These computer-interpretable models for the representation of construction methods can be used to support the automated generation of plans, schedules and cost-estimations. This paper reports about a study into the question how to generate plans, schedules and cost-estimations given (1) a standardized product model and (2) a library of standardized process objects implementing information about construction methods. Initial results of a system that supports the translation of the product oriented design/engineering view into the process oriented main contractor view will be shown and discussed.

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Full text: content.pdf (112,343 bytes) (available to registered users only)

Series: w78:1998 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.represent (0.026380) class.communication (0.018471) class.impact (0.016846)
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Permission to reproduce these papers has been graciously provided by Royal Institute of Technology, Stockholm, Sweden. The assistance of the editors, Prof. Bo-Christer Björk and Dr. Adina Jägbeck, is gratefully appreciated.


Dawood N, Sriprasert E, Mallasi Z, Hobbs B

Development of an integrated information resource base for 4D/VR construction process simulation and visualisation

Abstract: The objective of this paper is to report on the development of an integrated database to act as an information resource base for 4D/VR construction process simulation and visualisation. A comprehensive database was designed, implemented and populated with the School of Health Construction Project (An eight million pounds, three-storey development at the University of Teesside campus). The database is composed of a core database of building components which, in turn, is integrated with a CAD package (AutoCAD 2000), a project management package (MS Project) and graphical user interfaces. The core database was designed using the unified classification for the construction industry (Uniclass). One of the benefits of using the Uniclass method, apart from providing standards for structuring building information, is that it provides a media for integrating PBS (Product Breakdown Structure) with WBS (Work Breakdown Structure). This is an important aspect for delivering a meaningful 4D model. Integrated interfaces between MS Access Database, AutoCAD Drawings and MS Project Schedules were developed and implemented. Furthermore, the British Standards of layering convention (BS 1192-5) was adapted and implemented. The database was populated automatically with detailed product data directly from 2D or 3D drawings, schedules of work and resources of the School of Health Project. This paper is also addressing object definition, structuring the data, and establishing the relationships and dependencies within the data set, the WBS and building objects as well as modelling the building in 3D in order to capture the essential space- and time-critical attributes of tasks. Practical application of database throughout the construction process has been highlighted and discussed. A proposal for incorporating IFC model is also discussed.

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Full text: content.pdf (306,608 bytes) (available to registered users only)

Series: w78:2002 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.man-software (0.044096) class.represent (0.019318) class.synthesis (0.018813)
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.


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