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Hu D.,PCL Industrial Management Inc. | Mohamed Y.,University of Alberta
Journal of Construction Engineering and Management | Year: 2014

The process of planning and scheduling industrial construction fabrication (ICF) jobs is difficult because the sequence of operations varies considerably from one product to another due to the unique design and configuration of products. Traditional critical path method (CPM)-related approaches are not effective due to CPM's limitation or inability to model the repetition of operations, interactions between resources, and what-if scenarios. Discrete event simulation (DES) is often used to model processes that are repetitive in nature; however, DES has limitations in modeling ICF shops due to considerable differences between operation sequences, which means a model can only be used once per project. This paper proposes a new simulation-model-structuring methodology, which directly addresses product uniqueness and complex routing issues in ICF shops and significantly simplifies the simulation-model development. This methodology fully supports shop scheduling and schedule updating essential for ICF shops that operate under highly dynamic project environments. © 2014 American Society of Civil Engineers. Source


Olearczyk J.,University of Alberta | Hermann U.,PCL Industrial Management Inc. | Al-Hussein M.,University of Alberta | Bouferguene A.,University of Alberta
Construction Research Congress 2010: Innovation for Reshaping Construction Practice - Proceedings of the 2010 Construction Research Congress | Year: 2010

Managing the behaviour and trajectory of an object lifted by a crane is critical to a successful lift. This paper presents advancements in the development of mathematical algorithms for lifted object trajectory paths and analyses. The proposed methodology is divided into smaller manageable phases to control the process and at the same time to create independent modules. Each step of the lifted object movement was geometrically tracked, starting at the lifted object pick-point, through an optimum path development and completing at the object final position (set-point). Parameters such as the minimum distance between the lifted object and passing obstructions and minimum allowable clearance between the lifted object and the crane boom are some of the many predefined rules which were taken into account. The lifted object's spatial trajectory analysis and optimization is a part of the complex assignment relating to the crane selection process. A numerical example is presented to demonstrate the effectiveness of the proposed methodology and illustrate its essential value. Copyright ASCE 2010. Source


Abourizk S.,University of Alberta | Halpin D.,Purdue University | Mohamed Y.,University of Alberta | Hermann U.,PCL Industrial Management Inc.
Journal of Construction Engineering and Management | Year: 2011

Construction simulation, a fast-growing field, is the science of developing and experimenting with computer-based representations of construction systems to understand their underlying behavior. This paper provides a history of construction simulation theory, explores the CYCLONE modeling methodology and its major subsequent developments, examines the development of the Simphony.NET and COSYE modeling environments and their functionality as more generic simulation platforms, and reviews effective strategies for applying simulation in construction. A construction simulation case study is presented that illustrates one successful approach for adopting simulation technology in the industry and outlines the benefits to industry of integrating these technologies. The paper provides an overview of long-term simulation initiatives leading to the next generation of computer modeling systems for construction, where simulation plays an integral role in a futuristic vision of automated project planning and control. © 2011 American Society of Civil Engineers. Source


Olearczyk J.,PCL Industrial Management Inc. | Al-Hussein M.,University of Alberta | Bouferguene A.,University of Alberta | Telyas A.,Kullman Building Corporation
Congress on Computing in Civil Engineering, Proceedings | Year: 2012

Adequate crane position on construction site required large amount of site data to be collected, prior to any lift operation. Existed permanent/ non-permanent obstructions as well as objects being placed on their final position, must be considered for each lift. This paper presents a methodology for crane selection and on-site utilization evolutionary algorithm for multi-lifts for modular construction. The proposed methodology accounts for cranes capacity limitation as well as evaluates the crane carrier/body position and orientation. State-of-the-art methodology incorporate evolutionary algorithm that reacts to dynamic changing site conditions. This paper introduces a case study where the objectives were to simplify and optimize the field assembly operation for 5- three-storey dormitory buildings including bridges and large roofs in McGregor Village for Muhlenberg College in Allentown, Pennsylvania, USA. Each dormitory contains three types of modules and a total of 18 separate modular units. Fully habitable elements were delivered securely on flatbed trailers to the site in advance. An all-terrain mobile hydraulic crane placed in the center of construction site lift each module and placed like a puzzle floor by floor for each building at predefined position. All 100 lifts were conducted in only 10 working days. © 2012 American Society of Civil Engineers. Source


Patent
Pcl Industrial Management Inc. | Date: 2013-07-19

A module lift assembly includes first and second multipoint adapter plates separated by a horizontal transverse spreader bar; a lift frame having first and second longitudinal lift beams separated by horizontal transverse bracing; a plurality of slings of adjustable length connecting the first multipoint adapter plate to the first lift beam and connecting the second multipoint adapter plate to the second lift beam; and a plurality of slider assemblies each slidingly affixed to the first and second lift beams, and a lift shackle for attaching to a module.

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