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  • 1.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    Value delivery through product offers: a lean leap in multi-storey timber housing construction2007Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, Vol. 3, nr 1, s. 33-45Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Among large Swedish contractors there is currently a specialization trend towards an increased use of prefabrication and complete systems in housing construction. The Lean Construction development up to date has focused on the management of value delivery for complex construction projects. Typical Swedish housing projects do not experience this broad complexity; instead the main challenge seems to be to better specify and deliver customer value. Currently, the Lean Construction methods available are not by themselves enough for the generation of value in Swedish multi-storey housing construction. The aim of this paper is to examine the potential of the product offer (a well-defined and highly standardized building system developed from the value views of specific customers) as an aid in the generation and delivery of value for multi-storey timber housing construction.From the point of view of manufacturing and customer value, the product offer is considered a Lean strategy for integrated consideration of internal and external value. Case study experiences indicate that the product offer strategy provides stability and continuity for producers that in turn provides with Lean practices in marketing, design and manufacturing. Approaching Lean, small- to medium-sized Swedish producers should focus on improvements through Lean Manufacturing. However, since an emerging demand from the Swedish construction industry forces these producers to take a larger role in the construction process, more construction related Lean improvements must also be considered. In this regard, the product offer is demonstrated to be a promising Lean strategy for the Swedish housing industry.

  • 2.
    Erikshammar, Jarkko
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Lu, Weizhuo
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Olofsson, Thomas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Discrete event simulation enhanced value stream mapping: an industrialized construction case study2013Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, Vol. 10, s. 47-65Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Research Question/Hypothesis: Can a production process design framework created by integrating Value Stream Mapping (VSM) and Discrete Event Simulation (DES) be used to assess the production system performance, as predicted by a future state design of small and medium sized enterprises (SMEs) working in industrialized construction?Purpose: To explore a production process design framework in which VSM is used to identify doable improvements and DES provides analytical evaluation of them.Research Method: The demonstration was carried out at a Swedish SME industrialized construction component manufacturerFindings: VSM is unable to evaluate analytically the performance of the future state design. This inability leads to unnecessary implementation iterations. VSM assumes a deterministic model and cannot describe the dynamic behaviors of a system. The dynamic behavior of the construction processes will result in the future state design not performing as expected. However, by analytically evaluating the future state with DES helped the case company to implement a new production process design.Limitations: DES modeling is still time-consuming and needs skilled professionals, the cost of whom can be prohibitive for SMEs and demonstrated in one case study.Implications: The integration of DES and VSM provides a framework to evaluate and communicate the outcome, hence enhancing the application of VSM.Value for practitioners: A lean framework, which can be used, for industrialized construction processes especially by SMEs with very limited resources, to validate changes before implementing them.

  • 3.
    Forsman, Samuel
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknologi.
    Bystedt, Anders
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknologi.
    Öhman, Micael
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknologi.
    Interaction in the construction process: System effects for a joinery-products supplier2011Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, Vol. 2011, s. 1-18Artikel i tidskrift (Refereegranskat)
    Abstract [sv]

    Denna fallstudie beskriver svagheter i den samverkan som sker i byggprocessen vid upphandling av specialsnickerier. Resultaten visar på att informationen i processen är bristfällig och att dess överföring inte är säkrad. Kompetens att förädla och modellera information behöver utökas. En stor del av tiden tillförs inget värde till produkten vilket försvårar kommunikationen i värdekedjan vilket påverkar produktens kvalité. Mycket av problemen kan undvikas genom ökad interaktion mellan leverantören, föreskrivande arkitekter, och angränsande processer. En ökad grad av standardisering för samverkan och informationsutbyte, samt att minska systemberoende buffertlager för att öka andelen tid för värdeskapande aktiviteter, är andra förbittrare av prestanda i denna process.

  • 4.
    Lennartsson, Martin
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Step-by-step modularity: a roadmap for building service development2010Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, Vol. 2010, nr 1, s. 17-29Artikel i tidskrift (Refereegranskat)
  • 5.
    Simonsson, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Erikshammar, Jarkko
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Olofsson, Thomas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    'Learning to see' the effects of improved workflow in civil engineering projects2012Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, s. 35-48Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Research Question/Hypothesis: Value Stream Mapping (VSM) can, independent of work repetition, improve the performance of civil engineering projects by allowing the site management to visualize the flows of materials, resources and information.Purpose: The purpose is to show how VSM can be used by on-site practitioners to see the day-to-day flow of work, to understand the effect of straight-forward improvements to workflow, and to see the effect of applying industrialized working methods.Research Method: Applicability of VSM to civil engineering is examined through the fixing of reinforcement in two bridge construction projects. A traditional bridge was used to map (current state) and improve (future state) workflow. The potential of modern production methods are then analyzed in a second bridge project (ideal state).Findings: Allowing the site management to visualize and to see workflow improves the work performance of the two studied bridges. Addition of easy to understand and calculable metrics for lead time, inventory level and manufacturing costs, emphasize the potential savings of reactive and proactive workflow measures (≈ 80-90 %).Limitations: The paper considers fixing of reinforcement in two bridge construction projects. Additionally, the so-called future state bridge was not actually constructed, i.e. the savings stated for the future state, even if reasonable, are an approximation.Implications: The framework to visualize current, future and ideal workflow provides a framework to extend the VSM methodology to civil engineering projects.Value for practitioners: To overcome the sub-optimized mindset in civil engineering that repeatedly leads to the same practice, the paper proposes a straightforward and easy to use framework to visualize and analyze effects of workflow improvements.

  • 6.
    Stehn, Lars
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Höök, Matilda
    Lean principles in industrialized housing production: the need for a cultural change2008Ingår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, s. 20-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The deep-rooted project culture in construction, e.g. including the one-of-a-kindness of the project, the production set up, the construction site and the temporary organization, is stated to be a hindrance when applying lean principles. However, the biggest challenge to achieving a long-term benefit of lean application in industrialized housing production (80 % of the work in a factory environment) is here argued to be to approach a lean culture. The aim of this paper is therefore to deepen the understanding of how to approach a lean culture in industrialized housing production. A production questionnaire shows that industrialized housing production displays a projectbased culture similar to that found in on-site construction with low motivation for, e.g., error-proofing and continuous improvement. Results from the questionnaire and a case study show that workers rather fix problems as they arise ahead of focusing on errorproofing and continuous improvement. Lean Construction research has traditionally (up to latest years) focused on a top-down (top-management initiated project performance) tool approach to improve construction projects. However, theoretical and empirical proofs show that error-proofing and continuous improvement is statistically connected to worker motivation, and that workers follow standardized routines if they are visual and clear to workers. It is also shown that workers do not take own responsibility to obtain standardization in work and maintenance of equipment and tools. Therefore a simultaneous top-down/bottom-up (person focused) approach to achieve a lean culture in industrialized housing production is proposed. Generally, the study also points to more research to obtain a deeper understanding of lean culture and cultural change in construction.

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