The VIPP project : results from a case study of the practical application of 3D- and 4D-modelling... more The VIPP project : results from a case study of the practical application of 3D- and 4D-modelling techniques in design and construction
IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 2016
The purpose of the study is to 1) investigate the possibility to collect and present data of cons... more The purpose of the study is to 1) investigate the possibility to collect and present data of consumed human resources from all stakeholders over the project life cycle of transport infrastructure project; 2) discuss the use of such information with regard to the evaluation and suggestion for improvement of project performance. A well-defined engineering project, the interchange Bårhultsmotet consisting of two bridges over the route 40, was used as case study. A diagram presenting consumption of human resources over the project life cycle was constructed, starting at the initial project phase in the client organization and ending when the bridge was handed over for operation. The diagram raise a number of questions whether or not the time spent is value adding, especially between project phases considering the long lead times. The diagram also inspires to discussions of topics for further studies, for example the how to manage the gap (e.g. transfer/loss of information) between plann...
Rapporten redovisar de resultat som hittills framkommit i ett ERABUILD-projekt där avsikten är at... more Rapporten redovisar de resultat som hittills framkommit i ett ERABUILD-projekt där avsikten är att skapa industrialiserade processer för definition, utformning, byggande och fastighetsförvaltning som väsentligt kan effektivisera byggande och förvaltning av fastigheter över hela livscykeln. Målet med den svenska delen är att definiera en framtida industrialiserad byggprocess som är stödd av ett synkroniserat flöde av information, resurser, material och aktiviteter till byggplatsens olika produktionsställen. Hypotesen är att platsknutna planeringsmetoderna som Line of Balance och 4D tillsammans med en robust produktionsstyrningsmetod kan skapa arbetsscheman som kan genomföras med tillräcklig förutsägbarhet. Detta är nödvändigt för att kunna skapa bra och effektiva försörjningskedjor. Mobila verksamhetssystem är en lämplig teknologi för att kunna understödja ett sådant synkroniserat byggande. För att säkerställa en öppen tillgång till den gemensamma bygginformationsmiljön (VBE) kommer ...
Attempt to make accurate measurements of deformations of compressible soilds at high pressure and... more Attempt to make accurate measurements of deformations of compressible soilds at high pressure and different states of stress
Road construction operations often require considerable amounts of energy in the form of fossil f... more Road construction operations often require considerable amounts of energy in the form of fossil fuels, thus generating considerable greenhouse gas (GHG) emissions. While fuel efficiency of the heav ...
The nature of ice loads on vertical foundations is discussed based on statistical analysis of fie... more The nature of ice loads on vertical foundations is discussed based on statistical analysis of field data. Measured loads on segments of the total pressure area were typically Weibull distributed with a maximum of about 4 times the mean values. Scale effect on the maximum effective pressure was evident for uniform level ice when calculated for different contact widths. Maximum pressure on a larger contact width decreased but the mean pressure level remained constant. This confirmed the assumption that some but not all of the governing crushing phenomena were statistically independent. Elasticity of the structure or the ice sheet was assumed to increase the length of the independent crushing zones.
A combination of 4D modeling and location-based scheduling to support work flow management in con... more A combination of 4D modeling and location-based scheduling to support work flow management in construction process of a palletizing plant
IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 2016
Increasing industrial productivity and innovation is essential to meet needs to reduce lead times... more Increasing industrial productivity and innovation is essential to meet needs to reduce lead times and costs. However, diffusion of systemic innovations in project-based industries (PBIs), such as the infrastructure sector, has proven difficult. The Swedish Transport Administration (STA) has unique opportunity to influence the degree of innovation in the sector, due to its strong position as the largest public client of infrastructure in Sweden. Therefore, the aims of an ongoing study reported here are to identify and evaluate challenges and requirements affecting the diffusion of innovation related to this key client. This is being done by examining relevant aspects of construction infrastructure projects executed via the pre-defined design procedure currently applied by STA. The results reveal that the procedure hampers diffusion since certain activities must be performed early, is applied indiscriminately to all types of projects, and hinders inter- organizational collaboration.
Simulation is an effective quantitative analysis tool to compare and evaluate different system de... more Simulation is an effective quantitative analysis tool to compare and evaluate different system design. However, the application of simulation in construction industry has been limited to relatively restricted research fields. This paper presents a discrete event simulation (DES) model using Simphony.net in which quantitative performance evaluation between constant work-in-progress (CONWIP), a pull method that limits the work-in-progress (WIP) level in the production system according to the status of system, and push are provided. A card element in the simulation model is used to authorize the production, collect cards and limit work-in-progress (WIP) level in the system. The purpose of such comparison and evaluation is to explore the utilization of DES and CONWIP on inventory control. Uncertainty and variation in construction process has an important influence on project performance. The common practice to deal with variation is the holding of inventory. As demonstrated in developed simulation model in this research, suitable inventory improves the performance of project. However, excessive inventory induces no-added value. Simulation experiments show that application of DES and CONWIP provides an effective way of inventory control, simultaneously, maintain throughput and cycle time compared to push system. The research will be of interest to those evaluating the impacting of lean base method on construction project performance with simulation.
The VIPP project : results from a case study of the practical application of 3D- and 4D-modelling... more The VIPP project : results from a case study of the practical application of 3D- and 4D-modelling techniques in design and construction
IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 2016
The purpose of the study is to 1) investigate the possibility to collect and present data of cons... more The purpose of the study is to 1) investigate the possibility to collect and present data of consumed human resources from all stakeholders over the project life cycle of transport infrastructure project; 2) discuss the use of such information with regard to the evaluation and suggestion for improvement of project performance. A well-defined engineering project, the interchange Bårhultsmotet consisting of two bridges over the route 40, was used as case study. A diagram presenting consumption of human resources over the project life cycle was constructed, starting at the initial project phase in the client organization and ending when the bridge was handed over for operation. The diagram raise a number of questions whether or not the time spent is value adding, especially between project phases considering the long lead times. The diagram also inspires to discussions of topics for further studies, for example the how to manage the gap (e.g. transfer/loss of information) between plann...
Rapporten redovisar de resultat som hittills framkommit i ett ERABUILD-projekt där avsikten är at... more Rapporten redovisar de resultat som hittills framkommit i ett ERABUILD-projekt där avsikten är att skapa industrialiserade processer för definition, utformning, byggande och fastighetsförvaltning som väsentligt kan effektivisera byggande och förvaltning av fastigheter över hela livscykeln. Målet med den svenska delen är att definiera en framtida industrialiserad byggprocess som är stödd av ett synkroniserat flöde av information, resurser, material och aktiviteter till byggplatsens olika produktionsställen. Hypotesen är att platsknutna planeringsmetoderna som Line of Balance och 4D tillsammans med en robust produktionsstyrningsmetod kan skapa arbetsscheman som kan genomföras med tillräcklig förutsägbarhet. Detta är nödvändigt för att kunna skapa bra och effektiva försörjningskedjor. Mobila verksamhetssystem är en lämplig teknologi för att kunna understödja ett sådant synkroniserat byggande. För att säkerställa en öppen tillgång till den gemensamma bygginformationsmiljön (VBE) kommer ...
Attempt to make accurate measurements of deformations of compressible soilds at high pressure and... more Attempt to make accurate measurements of deformations of compressible soilds at high pressure and different states of stress
Road construction operations often require considerable amounts of energy in the form of fossil f... more Road construction operations often require considerable amounts of energy in the form of fossil fuels, thus generating considerable greenhouse gas (GHG) emissions. While fuel efficiency of the heav ...
The nature of ice loads on vertical foundations is discussed based on statistical analysis of fie... more The nature of ice loads on vertical foundations is discussed based on statistical analysis of field data. Measured loads on segments of the total pressure area were typically Weibull distributed with a maximum of about 4 times the mean values. Scale effect on the maximum effective pressure was evident for uniform level ice when calculated for different contact widths. Maximum pressure on a larger contact width decreased but the mean pressure level remained constant. This confirmed the assumption that some but not all of the governing crushing phenomena were statistically independent. Elasticity of the structure or the ice sheet was assumed to increase the length of the independent crushing zones.
A combination of 4D modeling and location-based scheduling to support work flow management in con... more A combination of 4D modeling and location-based scheduling to support work flow management in construction process of a palletizing plant
IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 2016
Increasing industrial productivity and innovation is essential to meet needs to reduce lead times... more Increasing industrial productivity and innovation is essential to meet needs to reduce lead times and costs. However, diffusion of systemic innovations in project-based industries (PBIs), such as the infrastructure sector, has proven difficult. The Swedish Transport Administration (STA) has unique opportunity to influence the degree of innovation in the sector, due to its strong position as the largest public client of infrastructure in Sweden. Therefore, the aims of an ongoing study reported here are to identify and evaluate challenges and requirements affecting the diffusion of innovation related to this key client. This is being done by examining relevant aspects of construction infrastructure projects executed via the pre-defined design procedure currently applied by STA. The results reveal that the procedure hampers diffusion since certain activities must be performed early, is applied indiscriminately to all types of projects, and hinders inter- organizational collaboration.
Simulation is an effective quantitative analysis tool to compare and evaluate different system de... more Simulation is an effective quantitative analysis tool to compare and evaluate different system design. However, the application of simulation in construction industry has been limited to relatively restricted research fields. This paper presents a discrete event simulation (DES) model using Simphony.net in which quantitative performance evaluation between constant work-in-progress (CONWIP), a pull method that limits the work-in-progress (WIP) level in the production system according to the status of system, and push are provided. A card element in the simulation model is used to authorize the production, collect cards and limit work-in-progress (WIP) level in the system. The purpose of such comparison and evaluation is to explore the utilization of DES and CONWIP on inventory control. Uncertainty and variation in construction process has an important influence on project performance. The common practice to deal with variation is the holding of inventory. As demonstrated in developed simulation model in this research, suitable inventory improves the performance of project. However, excessive inventory induces no-added value. Simulation experiments show that application of DES and CONWIP provides an effective way of inventory control, simultaneously, maintain throughput and cycle time compared to push system. The research will be of interest to those evaluating the impacting of lean base method on construction project performance with simulation.
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