A través del presente estudio queremos demostrar los beneficios de la aplicación combinada de los métodos Earned Value Management (EVM) y Last Planner® System (LPS) en la programación semanal de proyectos de construcción que involucren muros de contención para sótanos; para lo cual, hemos utilizado como base el estudio de “Combined Application of Earned Value Management and Last Planner® System in Construction Projects” Novinsky et al (2018), que consiste en una combinación en materia de Project Management y Lean Construction, aplicando el estudio en la construcción de muros anclados con el método pachamanca para un proyecto denominado “Edificio Multifamiliar Liri” ubicado en el distrito de Pueblo Libre, en el que se desarrollarán conjuntamente los métodos antes mencionados. En el primer capítulo desarrollamos los aspectos generales del trabajo de investigación, tales como el planteamiento del problema, los objetivos generales y específicos del presente estudio, el alcance de la ejecución del proyecto, así como la descripción de la metodología empleada para el desarrollo de mismo. En el segundo capítulo detallamos el marco teórico de los métodos señalados en el párrafo precedente; asimismo, los procedimientos del sistema constructivo para muros anclados, encofrados “pachamanca”, detallando algunos conceptos complementarios al desarrollo de la presente investigación. En el tercer capítulo, delimitamos algunos alcances referidos al Proyecto “Edificio Multifamiliar Liri”, tales como su ubicación, estructura de desglose de trabajo, programación de obra, hitos de control, cronograma valorizado, así como información adicional relacionada al proyecto. En el cuarto capítulo, desarrollamos el cuerpo del presente estudio, demostrando la aplicación combinada de los métodos Earned Value Management (EVM) y Last Planner® System (LPS); así como el modelo de implementación. En el quinto capítulo, presentamos los resultados obtenidos, así como el detalle del análisis de datos realizados. Finalmente, en el capítulo sexto, describimos las conclusiones y recomendaciones formuladas luego de haber realizado el presente estudio, las mismas que esperamos sean de utilidad e interés para la industria de la construcción. / By means of the current study we want to demonstrate the benefits of the combined application of the Earned Value Management (EVM) and Last Planner® System (LPS) methods in the weekly scheduling of construction projects that involve retaining walls for basements; because of this we have used as a basis the study of “Combined Application of Earned Value Management and Last Planner® System in Construction Projects”, Novinsky et al (2018), that consists in a combination in terms of the Project Management and Lean Construction, applicating the study in the construction of anchored walls with the pachamanca method for a project called “Edificio Multifamiliar Liri” located in the district of Pueblo Libre, in which they develop together the methods previously mentioned. In the first chapter, we develop the general aspects of the research study, such as the problem statement, the general and specific objectives of the current study, the scope of the Project implementation, as well of the description of the methodology used for its development. In the second chapter we detail the theoretical framework of the methods indicated in the previous paragraph. Likewise, the procedures of the construction system for anchored walls, formwork “pachamanca”, detailing some complementary concepts to the development of the current research. In the third chapter, we delimit some statements referred to the Project “Edificio Multifamiliar Liri”, as its location, work breakdown structure, work schedule, control milestones, valued schedule, as well as additional information related to the project. In the fourth chapter, the body of the present research, demonstrating the combined application of the Earned Value Management (EVM) and Last Planner® System (LPS) methods; as well as the implementation model. In the fifth chapter, we present the results obtained, as well as the detail of the data analysis performed. Finally, in the sixth chapter, we describe the conclusions and recommendations formulated after being carried out the current study, the ones that we hope that are useful and interesting for the construction industry. / Trabajo de investigación

El presente trabajo de investigación plantea la implementación y desarrollo de un planeamiento para el aseguramiento del flujo de construcción mediante la innovación con last planner system aplicado como ejemplo en un proyecto de edificación de gran envergadura. Los proyectos en el sector de edificaciones tienen una premisa constante en ser más cortos en plazo y ajustado en presupuesto, esto genera que el riesgo aumente por esta condición contractual y de mercado teniendo como consecuencia el reto al equipo de construcción para poder optimizar y sincerar el planeamiento inicial con el cual fue adjudicado. En este trabajo de investigación se ha desarrollado soluciones como crítica al planeamiento inicial en el cual durante la ejecución se había perdido plazo poniendo en riesgo el proyecto. Es por ello que, se planteó como soluciones lo siguiente: Encofrado de vigas prearmado, desfase de núcleo de ascensor y optimización de torre grúa. Estas optimizaciones y cambios al planeamiento inicial se ejecutaron con éxito en el proyecto de manera que se obtuvo como resultado la recuperación del plazo y adelanto en la ejecución. / This research work proposes the implementation and development of a strategic planning for the assurance of the construction flow through innovation applied as an example in a large-scale building project. The projects in the building sector have a constant premise of being shorter in terms of time and tight in budget, this generates that the risk increases due to this contractual and market condition, resulting in the challenge to the construction team to be able to optimize and honest the initial planning with which it was awarded. In this research work, solutions have been developed as critical to the initial planning in which, during the execution, time had been lost, putting the project at risk. That is why the following solutions were proposed: pre-assembled beam formwork, elevator core offset and tower crane optimization. These optimizations and changes to the initial planning were successfully executed in the project, resulting in the recovery of the deadline and advancement in the execution. / Trabajo de investigación

Research reveal that the construction industry does not have the same level of growth and development in performance compared to the manufacturing industry, and that Lean could be one solution to improve performance. Most research about Lean in the construction industry that exist today focus on simulating future scenarios. Hence miss analysing the impact Lean has on the current situation of construction projects, and its usability and possibility to set the framework for how to improve performances in construction projects. Thus, there is a gap in research concerning the evaluation on current process flows. This research explores Lean as a management method to understand how it has been used in the construction industry and how it could be used in construction projects to improve process flows. This will be done by using the method Value Stream Mapping, a method within Lean that is used to identify Non-Value-Adding activities in the process flow to point out what activities can be improved. The case study in this research explores two different value streams within two construction projects; deliveries and mounting one side of the framework of interior walls. Thus, the research will explore if and how the value stream differentiates between the two projects, with the aim to understand the reason for the results to understand how future construction projects could improve their process flows within a value stream. Data will be collected and analysed qualitative by combining observations and interviews. The value stream for deliveries differentiated between the projects. Project A had 73% Non-Value-Adding activities with a cycle time of 3,1 m2/min whilst Project B had 65% with a cycle time of 2,7 m2/min. In both projects Non-Value-Adding activities were categorized as Waiting, Movement, Transport and Overproduction. The value stream for mounting in Project A had 31% Non-Value-Adding activities with a cycle time of 2,9 m2/hour whilst Project B had 41% Non-Value-Adding activities with a cycle time of 1,7 m2/hour. In both project activities were categorized as Waiting, Transport, Incorrect processing and Movement. However, in Project B Overproduction was also identified as a Non-Value-Adding activity. Findings from the study shows that even though construction projects are complex and consist of variabilities, it is possible to observe value streams to identify Non-Value-Adding activities. Nevertheless, it is crucial to adjust the method to the construction industry since the theory of Value Stream Mapping originate from the manufacturing industry. This research recommends excluding number of resources as a category from the method and instead evaluate resources based on the total time, and to categorize inspections and reading drawing as Value-Adding activities instead of Non-Value-Adding. The study reveals that construction projects that work with Lean and its method Value Stream Mapping are given new opportunities to improve process flows. Thus, construction projects could be able to improve processes without needing to invest in more resources, material and tools. Not only could projects lower construction costs but also improve production time as Non-Value-Adding activities are reduced. Thus, the research believes Lean and its method Value Stream Mapping could improve performances within the construction industry. / Tidigare forskning menar att Lean skulle kunna vara en lösning på det faktum att byggindustrin inte har haft lika stor tillväxt och utveckling som bilindustrin. Den forskning som finns idag gällande Lean i byggindustrin fokuserar på att simulera framtida scenarier av den effekt Lean skulle kunna ge. Därav försummas analysering av den faktiska effekten Lean har i pågående situationer samt användbarheten och möjligheten att fastställa ramverk för hur man kan förbättra prestationer och tillväxt i byggprojekt. Denna studie utforskar Lean som en ledarskapsmetod. Studien fördjupar sig i Lean för att förstå hur det tidigare har använts i byggindustrin och förstå dess användbarhet och möjlighet att förbättra processflöden i byggprojekt. Value Stream Mapping, en metod inom Lean kommer att användas för att identifiera icke-värdeskapande aktiviteter i process flöden samt för att se vilka aktiviteter som kan förbättras eller elimineras. Fallstudien i denna forskning undersöker två olika värdeflöden inom två byggprojekt; ta emot leveranser och enkling av innerväggarna. Studien kommer att undersöka om och hur värdeflödena skiljer sig mellan de två projekten, med syfte att förstå orsaken till resultaten och förstå hur framtida byggprojekt kan förbättra processer inom värdeflödena. Data samlas in och analyseras kvalitativt genom att kombinera observationer och intervjuer. I värdeflödet för leveranser hade Projekt A 73% icke-värdeskapande aktiviteter med en produktionstid på 3,1 m2/min medan Projekt B hade 65% icke-värdeskapande aktiviteter med en produktionstid på 2,7 m2/min. Aktiviteterna i projekten kategoriserades som slöseri i form av, väntande, rörelse, transport och överproduktion. I värdeflödet för monteringen hade Projekt A 31% icke-värdeskapande aktiviteter med en produktionstid på 2,9 m2/h medan Projekt B hade 41% icke-värdeskapande aktiviteter med en produktionstid på 1,7 m2/h. I. I båda projekten kategoriserades icke-värdeskapande aktiviteter som slöseri i form av, väntande, rörelse, transport och fel bearbetning. Projekt B hade även slöseri i form av överproduktion. Studien visar att trots att byggprojekt är komplexa och varierande, är det möjligt att observera värdeströmmar för att identifiera aktiviteter som inte tillför värde. Det är däremot nödvändigt att anpassa metoden till byggindustrin då Value Stream Mapping grundar sin teori från bilindustrin. Studien rekommenderar att utesluta antalet resurser som en slöserikategori och istället utvärdera resurser genom att se på den totala tiden samt att kategorisera inspektioner och läsa ritning som värdeskapande aktiviteter i stället för icke-värdeskapande. Studien visar att byggprojekt som arbetar med Lean och dess metod Value Stream Mapping ges möjligheter att förbättra sina processflöden. Således skulle byggprojekt kunna förbättra processer utan att behöva investera i mer resurser, material och verktyg och därmed kunna sänka byggkostnaderna. Slutligen skulle byggprojekt kunna förbättra sina produktionstider då icke-värdeskapande aktiviteter reduceras. Studien visar därmed att Lean och dess metod Value Stream Mapping skulle kunna förbättra tillväxten inom byggindustrin.

I traditionellt planeringsarbete isoleras arbetsgruppers teamwork genom ensamarbete. Ett sätt att förbättra teamworket och därmed planeringsarbetet är att integrera de personer som ska utföra arbetet. En metod för integreringen är visuell metodik. Metoden är relativt ny i byggbranschen och har sitt ursprung från tillverkningsindustrin. Hur byggproduktion drivs visuellt kan variera i omfattning. Visuell metodik är inte ett väldefinierat begrepp och det råder brist på utbildning och information om metoden.Examensarbetet har utförts på Skanska Region Hus Syd under våren 2013. Syftet med examensarbetet var att undersöka hur visuell metodik tillämpas i byggproduktion. Studiens mål är att stödja byggbranschen med en definition om vad visuell metodik innebär i praktiken. Följande frågor har hanterats i studien:-Vad krävs för att styra och planera visuellt? -Hur fungerar interaktionen mellan visuell och icke-visuell metodik? -Hur upplever personalen visuell metodik? -Vilka risker och möjligheter bör beaktas vid visuell metodik?Studien har besvarat frågorna genom en fallstudie. Teori samlades in och behandlades i litteraturstudien, den låg sedan som grund för empirin. Empirin utfördes som en kvalitativ studie med datainsamling från observationer på arbetsplatser samt intervjuer av ett urval av arbetsplatsens personal. Syftet med empirin var att redogöra hur visuell metodik utförs i praktiken och hur det upplevs av personalen.Resultatet visar på att visuell metodik kan effektivisera byggproduktion genom ökat engagemang och delaktighet från produktionsledare, yrkesarbetare och underentreprenörer. Användarna var övervägande positiva till arbetsmetoden och rekommenderade visuell metodik till alla typer av projekt, oavsett storlek. Författaren upplevde dock spritt engage- mang från användarna, alla upplevdes inte lika engagerade som de intervjuade. Med bristande engagemang finns risk att arbetsmetoden tappar förtroende från användarna och därmed metodens effektivitet. Resultatet visar även på vikten av att införa visuell styrning från produktionens start, en implementering mitt i ett projekt kan bli mer resurskrävande än effektiviserande.Rapporten klargör en definition om vad visuell metodik innebär i praktiken, vilka resurser som ingår och vilka rutiner som följs. / In traditional planning the teamwork of workgroups is isolated by individual work. One way of improving teamwork and thus also planning is to integrate the people who are going to do the work. Visual methodology is on method for integrating. The method is relatively new in the construction industry and originates from manufacturing industry. Visual methodology is not a well-defined concept and there is a lack of training and information concerning the method.A thesis has been carried out in Skanska Region Hus Syd in the spring of 2013. The purpose of the thesis was to research how visual methodology is applied in construction production. Study’s aim is to support the field of construction with a definition about what visual methodology means in practice. The study examined the following questions:-What is required to control and plan visually? -How does the interaction between visual and non-visual methodology work? -How staff perceives visual methodology? -What are the risks and opportunities involved in visual methodology?The study has answered the questions with a case study. Theory was assembled and used in theoretical framework; it was then used for empirical research. The empirical research was carried out as a qualitative study with the collection of data from observations at the work place and interviews with a selection from the staff at the work place. The aim of the empirical research is to describe how visual methodology is used in practice and how the users experience it.The result shows that visual methodology can make construction production more effective through increased commitment and involvement from production managers, skilled workers and subcontractors. Users were predominantly positive towards working methods and recommended visual methodology for all types of projects, regardless of size. Still, the author experienced varying levels of involvement from users, not everyone was as in- volved as those who were interviewed. With a lack of commitment there is a risk that the working method loses the confidence from the users and hence efficiency.

The construction industry is characterized by complex processes and low productivity. Improving productivity can be partly attributed to more efficient logistic flows. Both materials and resources play a crucial role in the success and cost-effectiveness of projects. Therefore, profitability can be enhanced by avoiding waste and optimizing material handling. However, despite the potential for improving productivity and profitability through a systematic approach to logistics, there doesn't seem to be an industry standard for involving logistics experts in various projects. Hence, this report investigates how logistics are managed in the construction industry. This study is a concluding part of the construction engineering program at Linköping University. The study presents both theoretical perspectives combined with empirical data leading to the study's results. An overview of the construction process is presented, followed by a deeper insight into logistical concepts such as Lean and just-in-time, as well as an introduction to the function of third-party logistics providers. The empirical data of the study is based on case studies of four construction projects in central Sweden, where interviews were conducted with project managers. Interviews were also conducted with representatives from third-party logistics providers regarding the construction projects they were involved in and the roles they played. The conclusions drawn in the study emphasize the importance of adapting logistics planning to the project's characteristics. Clear communication and collaboration between clients, contractors, and any third-party logistics providers are crucial to ensuring effective logistics in construction projects. There are also benefits to clarifying the distribution of responsibilities and increasing awareness of the importance of logistics in construction projects. Additionally, there is a desire to raise awareness of the importance of logistics in construction projects and highlight good examples and success factors to potentially improve efficiency and productivity within the construction industry. / Byggindustrin kännetecknas av komplexa processer och låg produktivitet. En del av att förbättra produktiviteten kan härledas till effektivare logistikflöden. Man kan se att både material och resurser spelar en avgörande roll för projekts framgång och kostnadseffektivitet. Genom att undvika spill och optimera hantering av material kan således projekts lönsamhet förbättras. Men trots att man genom ett systematiserat arbetssätt av projekts logistik kan förbättra produktiviteten och lönsamheten verkar det inte finnas en branschstandard att involvera logistikexperter i de olika projekten. Därav avser den här rapporten att undersöka hur man arbetar med logistik i byggbranschen. Den här studien är ett avslutande moment inom högskoleingenjörsprogrammet byggnadsteknik på Linköpings universitet. Studien grundar sig i teoretiska perspektiv som tillsammans med empiriska data leder fram till resultatet av studien. En genomgång av hur byggprocessen fungerar presenteras för att sedan följas av en djupare insyn i logistiska koncept så som Lean och just-in-time, och även en introduktion till funktionen av en tredjepartslogistiker. Studiens empiri grundar sig i fallstudier av fyra byggprojekt i mellersta Sverige där intervjuer har skett med projektledare för projekten. Intervjuer har även skett med representanter från tredjepartslogistiker gällande byggprojekt de varit involverade och vilken roll de har fått. Slutsatserna som dras i studien betonar vikten av att anpassa logistikplaneringen efter projektets karaktär. Tydlig kommunikation och samarbete mellan beställare, entreprenörer och eventuella tredjepartslogistiker är avgörande för att säkerställa effektiv logistik i byggprojekt. Det finns även fördelar med att tydliggöra ansvarsfördelningen och öka medvetenheten kring vikten av logistik i byggprojekt. Dessutom önskar man öka medvetenheten kring vikten av logistik i byggprojekt och lyfta goda exempel och framgångsfaktorer för att eventuellt kunna förbättra effektiviteten och produktiviteten inom byggbranschen.

A major challenge faced by project managers is balancing the variables of scope, cost, and schedule. Changes in scope usually result in cost/schedule overruns. Variance in either or both of them creates disorder (typically increases) in the estimated or projected time and cost. Therefore, controlling cost and schedule are two of the most critical aspects of a construction project. This research uses two already existing management theories, specifically Management by Means (MBM) and Management by Results (MBR), and analyzes a case where these two theories are combined with the goal of improving construction practices. This research compares an eight month schedule in a construction project and relates Percentage of Planned activities Completed (PPC) with projected and actual draw (cash) calls. The research analyzes the question of how lean construction PPC captures variance in cost. The research method is based on a literature review, data collection, case study and data interpretation to answer the hypothesis that improvement in PPC over a particular month has a positive correlation with difference between cash calls. Because this research is limited to a time frame of 8 months in a single project, it is not statistically significant. However, this research serves to create a model template or pilot study for a larger study.

Kostnaden för nyproduktion av hus i Sverige har ökat markant under de senaste åren. Byggföretag har svårt att hålla både projektens löptid och kostnader nere, vilket resulterat i ett ökat marknadspris och ett växande missnöje bland slutkunder. De ökade kostnaderna beror enligt forskning på vanligt förekommande slöseri i form av såväl material som arbetskraft. I försöken att eliminera slöseri har många företag anpassat sin verksamhet efter Lean Thinking, ett system som härstammar från den japanska bilindustrin, bestående av verktyg och metoder med huvudsyfte att identifiera och eliminera slöseri. Ur detta har även nya former av byggnation fångat marknadens intresse. Industrialiserat byggande är en metod som förflyttat stora delar av verksamheten från byggarbetsplats till prefabricering i fabrik och på så sätt eliminerat många av de slöseri och riskmoment som förknippas med det traditionella synsättet på byggnation. Studien lägger fokus på hur arbete med Lean Thinking och prefabricerat byggande kan avhjälpa de kostnadsproblem som branschen ställs inför på dagens marknad. Genom en fallstudie har vi beretts möjlighet att på nära håll studera för- respektive nackdelar med ett prefabricerat byggande, samt fått möjlighet att studera en organisation där verksamheten utgår från Lean Thinking. Studien visar att det genom Lean Thinking och prefabricerat byggande går att minimera vanligt förekommande slöseri inom byggbranschen. Utförandetiden för prefabricerat byggande är också mycket kortare än vid traditionellt byggande och på så vis hålls kostnaderna nere. Genom att ytterliga utveckla prefabricerat byggande enligt Lean Thinking skulle det vara möjligt att i större utsträckning minimera slöseri och möjliggöra ett ännu smartare byggande. / The costs of house construction in Sweden have increased conspicuously over the last years. Construction companies have a hard time maintaining low project lead-times as well as keeping costs within the financial plan, which in turn has affected market price and created a growing discontent amongst buyers. Research indicates that the increased production costs are in many ways caused by the large amount of waste, in form of materials and labor, which is common within today’s construction projects. Efforts to eliminate waste has led many companies to adapt Lean Thinking, a system with roots in Japanese car manufacturing industry, containing tools and methods designed to identify and eliminate all kinds of waste. From all this, new ways of construction has been introduced on to todays market. Industrialized housing is a relatively new concept, which has eliminated a lot of waste and risks by moving construction away from an on-site project into prefabrication within factories. This study focuses on how Lean Thinking adaptation and industrialized construction can help lowering construction costs. A case study has given us the opportunity to follow an industrialized construction project up close, as well as the opportunity to study an organization that has implemented Lean Thinking. The study shows that it is possible to reduce common waste within construction industry through Lean Thinking and industrialized housing. The project lead-time for industrialized housing is also much shorter compared to traditional construction methods and therefore the costs are kept low. By continuing to evolve industrialized housing through Lean Thinking it would be possible to further reduce waste and consequently enabling an even smarter way of construction.

Construction productivity lags behind most industries. In general, the process of construction is carried out in several smaller processes. For the overall construction process to be successful, continuity between these smaller processes must be achieved. This has been the persistent goal of construction productivity improvement for decades now. Waste is generated between the continuing activities by the unpredicted release of work and the arrival of resources. However, in recent decades the construction industry has a great need to improve its productivity, quality and incorporate new technologies to the industry due to increased foreign competition. In the late 1980s, researchers started looking at solving this problem in a more general and structured way based on the philosophy and ideology of lean production. In lean, adopting waste identification/reduction, or meeting the client's needs with minimal resources addresses the performance improvement. With recent developments in the construction industry, introduction of building information modeling (BIM) has had a significant influence on leaner construction. They are both complementary in several important ways. Various studies conducted exhibit that BIM is very crucial in reducing the project cost, site conflicts, project duration, error reduction, better and faster design development, and so on. This brings the question; can BIM be used as a tool for leaner construction? The objective of this thesis is to determine how BIM is helping achieve a leaner construction. More and more companies are adopting BIM as an acceptable waste reduction tool. A comprehensive study of lean theory and BIM was conducted, underscoring ways for BIM to help achieve leaner construction. The research was broadly conducted in three different parts. In the first part, a synthesis is drawn from a literature study to show that BIM helps reduce waste, helps in implementing lean techniques, and achieves lean principles. The second part focuses on the data acquired from a construction company to show that BIM helps reduce project cost, duration and conflicts. The third and the last part focused on getting the perspective view of different professionals in the construction industry on BIM by conducting focus interviews. A comprehensive conclusion was derived based on the findings from the three methods adopted.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O gerenciamento do tempo nos projetos de construção civil usualmente utiliza algoritmos determinísticos para o cálculo dos prazos de finalização e algoritmos PERT para avaliação da probabilidade de o mesmo terminar até uma determinada data. Os resultados calculados pelos algoritmos tradicionais possuem defasagens nos prazos se comparados aos encontrados na realidade o que vem fazendo com que a simulação venha se tornando uma ferramenta cada vez mais utilizada no gerenciamento de projetos. O objetivo da dissertação é estudar o problema dos prazos de finalização dos projetos desenvolvendo novas técnicas de cálculo que reflitam melhor os prazos encontrados na vida real. A partir disso é criada uma ferramenta prática de gerenciamento do tempo de atividades de projetos de construção enxuta baseada em planilha eletrônica onde serão utilizadas técnicas de simulação a eventos discretos, com base em distribuições de probabilidade como, por exemplo, a distribuição beta. / Time management in construction projects usually use deterministic algorithms to calculate the time of fulfillment, and PERT algorithms to evaluate the probability of such project ending by a certain date. The results achieved by traditional algorithms are not accurate when compared to those found in the field, which is increasing the use of simulation as a tool in project management. The aim of this dissertation is to study the deadline fulfillment problems of projects, developing new calculation techniques that better represent the deadlines found in real life. For such study is developed a practical tool for time management of lean construction projects based on spreadsheet which will be used discrete event simulation techniques based in probability distributions, such as, the beta distribution.

Este trabalho propõe uma organização para o processo de construção de um prédio comercial, encadeando a logística de abastecimento do canteiro com a montagem das estruturas metálicas. Esta foi desenvolvida a partir dos conceitos lean originários do Sistema Toyota de Produção e, posteriormente, foram aplicados em outros setores como o da construção civil. Para enfatizar problemas críticos de processo e identificar suas soluções, foi estudado um anteprojeto de obra localizada no Centro da cidade do Rio de Janeiro. A sincronização entre a atividade logística e o processo de montagem das estruturas seguiu a lógica lean de redução de tempos de espera, de eliminação de estoques em canteiro e de criação de frentes simultâneas de fechamento dos andares, como condição para a melhoria de produtividade da obra. Foi analisado o mapeamento da cadeia de valor do fluxo de materiais e operações compreendidos entre o depósito de estruturas e a obra, verificando o balanceamento de atividades de produção e os possíveis ganhos de produtividade. Os resultados obtidos evidenciariam potencial de ganho na medida em que fornece justificativas para a aplicação das ferramentas lean no estudo do anteprojeto de construção, integra a obra com o abastecimento logístico das estruturas e principalmente reduz os desperdícios de espera e estoque. Conclui-se, portanto, que o sistema lean, aplicado a este estudo, reúne condições para a melhoria de produtividade do processo construtivo e por conseguinte aumenta sua competitividade. / The aim of this work is to apply the Lean Construction plan, based on Toyota Production System, as the main strategy for the steel structure assembly in a commercial building. The Lean System target is to increase the productivity in the construction process by considering the synchronism between the logistic activities and the steel structural erection. This synchronism can be obtained by following the Lean Logic of reducing the time delay, the elimination of inventory in the building site and the organization of simultaneous teams for the assemblage of the steel parts. The material flow and the sequence of activities are represented in a value stream map, in order to identify the time wasted during the process and trying to otimize sequence of operation. At the end, by analyzing a particular project of a building at the center of Rio de Janeiro, the critical problems involved in a steel construction were identified and some alternative solutions for these problems, based on Lean System, are proposed.