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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Panel Stacking and Worker Assignment Problems in Residential Construction Using Prefabricated Panels: A Lean Approach

Guo, Cheng 08 June 2010 (has links)
A current trend in residential construction is the use of prefabricated wall panels. It is important to carefully establish how panels will be stacked, because an optimal sequence will improve productivity and reduce the possibility of worker injury. Mathematical models and heuristics are proposed for solving the panel stacking problem without consideration of interference. Dissertation work includes a mathematical model of the corresponding panel stacking problems in which the goal is to minimize total weighted panel move distance concurrent with certain construction assumptions. The heuristic method was provided to establish how each panel would be stacked and gave the drop-off location of each stack. The heuristic method was found to be able to reduce the total weighted panel move distance and ensure connectivity was always maintained, meanwhile, interference could also be avoided. In terms of solution speed, the heuristic method can solve real size problems in less than one second. Solutions to such problems can increase productivity. Three improvements to the only known existing panel stacking algorithm with consideration of interference were proposed. The computational results indicate the proposed algorithm performed better than existing algorithm in all experimental cases. Improvement on panel move distance ranged from 1.35-47.93%, and improvement on interfering panels ranged from 20-100%. The proposed algorithm can solve non-rectangular cases (not possible with existing algorithm) and was compared with an experienced panel designer and commercial software. When compared to the proposed algorithm, total weighted panel move distance increased 0.10-85.52% and 0.77-136.23%, respectively, for the panel designer and software. While connectivity was 100% for all cases with the proposed algorithm (the algorithm ensures connectivity is always maintained), it ranged from 69.56-86.95% and 73.33-90.91%, however, for the panel designer and software respectively. Finally, the proposed algorithm can solve the interfering panels in the last stack: this cannot be done with the existing algorithm. Because prefabricated wall panels are typically large and cumbersome to work with, there is a significant probability of worker injury. It is important to carefully establish how each panel will be handled by workers. This is typically the responsibility of field construction foreman, but such personnel are often ill-equipped to make such decisions. An alternative, proactive approach is to establish how each panel will be handled in advance, such that overall ergonomic consequences can be properly considered. This dissertation presents mathematical models of the corresponding construction task scheduling and worker assignment problems, where the goal is to minimize total project completion time (subject to worker quantity constraints) and assign tasks to workers as evenly as possible. The solution of such problems can help residential construction managers better plan construction by establishing the ergonomic impact associated with a given construction plan. A heuristic was also developed to solve large problems by balancing workload between workers. The heuristic was found to be able to provide near-optimal solutions, and can solve large problems in less than one second. / Ph. D.
2

An Examination of the Evaluation Model of the ¡§living road nets transportation construction¡¨ With the Commencement of sustainable development

Wu, Jui-an 27 August 2005 (has links)
A complete road transport system is an essential requirement of regional development. In response to changes in the overall environment, the selection of a road transport system must take into account protection of the ecosystem, social development, public awareness, economic benefit, and the financial burden placed on various levels of government. Further, since the construction of a road transport system is closely related to the rate of regional development, the selection of a road construction network and the sequence in which plans are implemented necessarily have far-reaching effects on urban development. In 2002, the Construction and Planning Agency, Ministry of the Interior (CPAMI) promulgated the ¡§living road nets transportation construction,¡¨ revised the study of mechanisms, proposed an evaluation model, and subsequently established an examination and coordination team. In fiscal 2003 and 2004, projects were selected based on the evaluation model and the plan was implemented. Looking back at the results, it has been discovered that implementation by public agencies has dealt primarily with budget implementation. An assessment of the project schedule has revealed that it does not reflect local needs. Thus, this paper employs the original evaluation model to look at revision and develop an evaluation model for objectively establishing priority in the implementation of road projects in an attempt to achieve an optimal implementation procedure that both meets local needs and achieves optimal effects. It is intended for reference by public agencies in decision making when promoting road construction. The research referred the CPAMI ¡§living road nets transportation construction,¡¨ revised the study of mechanisms, by collecting the relativity articles and discussion, using the method of Analytic Hierarchy Process proposed an evaluation model. Finally, compared with three project of ¡§Tainan living road nets transportation construction, 1¡¦st modified plain¡¨ by the two evaluation model. There¡¦s fund that the research¡¦s evaluation model is can be reflection the really condition of necessary. By the concrete evidence; the right of ¡§strengthen the transportation functions & services ability of cities¡¨ and ¡§arise the accessible, equilibrium the development of living area road system¡¨ is 0.106, &0.095, is the highest scored of all the 15 targets. There is corresponding to the characteristics of ¡§the accessible and services ability of region area is the important index of evaluated city¡¦s transportation¡¨. The right of ¡§cooperate the environment¡¦s sustainable developments¡¨ is 0.254; it¡¦s the 3rd important of the 4 object. Observed from difference region of specialists; the right of scholiasts is obviously higher than other¡¦s. So, there¡¦s a drop in evaluation between researching units and excusing units about sustainable development. At last, by compared with three project of living road nets transportation construction, there¡¦s a result; the score of ¡§raising the excusing of living road nets transportation construction¡¨ have no difference, but the score of ¡§cooperate the environment¡¦s sustainable developments¡¨ have much difference. It indicates that ¡§Under the prevailing trend of thought of sustainable development, the cost of economics wasn¡¦t the main consideration of transportation construction, the cities construction is pay much attention to environment & social cost¡¨.
3

Skladovací hala Dvořisko - stavebně technologický projekt / Storage hall in Dvořisko - construction technoly project

Bříza, Lukáš January 2018 (has links)
The subject of my thesis are selected parts of construction technology project of Construction of the Storage hall in Dvořisko, Choceň. This thesis solves technological regulation for monolithic construction, technological report site equipment, suitable choice of construction machinery, timetables, inspection and test plan, occupational safety and dealing with traffic routes.
4

Stavebně technologické řešení zdravotního střediska ve Vizovicích / Constructive - Technological Project of Medical Center in Vizovice

Špalková, Martina January 2015 (has links)
The diploma thesis is based on a project of medical centre in Vizovice. The medical centre is designed as a three-floor building with a receding top floor. Building foundations are designed from foundation pads and strips from reinforced concrete, the load-bearing masonry is designed from hollow clay blocks ZELUS, a reinforced concrete ceiling is designed as a bracing element. The medical centre is roofed by a flat roof with a PVC covering. This thesis deals with the budget and time plan of the whole construction, transport accessibility of the building, building maintenance instructions and maintenance costs for 25 years, daylighting of room number 1.32, an engineering report of construction site equipment and its drawing, a design of lifting mechanism of the site equipment, a plan for transport of concrete and concreting the floor slabs. The thesis is mainly focused on roofing of the medical centre, technological regulation for the roofing and reinforced concrete floor slabs is elaborated, as well as a control and test plan for the floor slabs from the reinforced concrete and for the roof PVC foil.
5

Vybrané části STP pro výstavbu administrativně bytového komplexu Sochorova / Selected parts of the Construction-technology Project for construction of Administration and Flat Buildings complex Sochorova

Dvořák, Marian January 2012 (has links)
Masters thesis is engaged of chosen parts of technological-buildig project of administrativ and housing complex of Sochorova in Brno, Žabovřesky. Contains technological-buildig study of first phase with brief description of advancement of construction with grafical scripts of particular steps, timetable and pecuniarytable of objects AB3, AB4, diagrams with various possibilities of using operatives. Thesis continous with calculation of entire first phase and item budged of object AB3(draft construction), statement of masurement, technical report of construction-technological AB3, plan of situaction of the building, technological manual of reiforced concrete ceiling of AB3 including plan of planking parts PERI, timetable, design of construction site equipment with technical report, proposal of machineries and crane, plane of inspections for chosen items, ecology and report about safety and health protecting on construction site.
6

Vysokovklopn lopata devn­ tÄpky / High tipping shovel for the wood chips

ulk, Petr January 2021 (has links)
High tipping shovel, wood chips, quick coupler, shovel, high tipping shovel frame, Volvo L60H loader, wheel loader accessories, linear hydraulic motor

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