• Title/Summary/Keyword: Construction Time

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Essence Applicability Matrices for the Reduction of Project Cycle Time

  • Hong, Tae Hoon;Son, Jae Ho
    • Architectural research
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    • v.8 no.1
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    • pp.57-68
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    • 2006
  • Global competition and reduced project life cycle ultimately puts greater performance requirements on the capital project delivery systems used to maintain competitiveness. Despite continuing improvements in delivery cycle time, business owners of facilities continue to demand greater improvements in project delivery cycle time. Therefore, it is very important to investigate the various techniques and methods leading to reduction in project cycle time and also identify the applicability of identified techniques and methods. This paper introduces reduction techniques identified through literature review (i.e, Schedule Reduction Techniques (SRTs), Management Techniques (MTs), and Construction Institute Industry (CII) Best Practices (BPs). In order to collect applicability of these techniques under different project phases (Pre-project planning (PPP), Design (D), Material Management (MM), Construction (C), and Start-up (SU)), the Essence Applicability Matrices (EAM) is used.

A Study on Cost Standards for Securing Appropriate Construction Costs for Small-Scale Construction Sites (소규모 시공현장 적정공사비 확보를 위한 원가기준 마련 연구)

  • Oh, Jae-Hoon;An, Bang-Yul
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.347-348
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    • 2023
  • In construction sites, small-scale construction quantities or limited work hours below the daily work volume may occur due to on-site conditions. For small-scale quantities, the input of equipment and labor is designed based on an hourly basis in the invoice, resulting in a difference from the actual cost. In this study, we aim to explore solutions from the perspective of construction cost standards to secure appropriate construction costs for small-scale and time-limited construction sites. Firstly, to preserve the basic construction costs on-site, we established standards where half the cost would be charged for construction quantities below four hours and a full day's cost would be designed for construction quantities between four to eight hours. Additionally, realistic construction cost calculation standards are expected to be provided by realizing a surcharge rate for work hour limitations to secure appropriate construction costs.

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Development of an Effective Time Scheduling Mechanism of the Structural Framework for the High-rise Apartment Housing -Focusing on One Cycle Time Scheduling Mechanism of Typical Floor- (아파트 골조공사의 공기단축 및 효과적 공정운영 방안 -기준층 사이클 공정분석을 중심으로-)

  • Han Choong-Hee;Bang Jong-Dae
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.4 s.20
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    • pp.87-96
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    • 2004
  • The construction duration in apartment construction is an important factor which affects project cost. Henceforth, the time shortening is essential to retrench project cost and project risk when there adopt Five-Day Workweek and introduce apartment sales after completion of construction. Therefore, the purpose of this study is to examine closely the affecting factors on the duration of framework which forms about $40\sim50\$ percent of total time in apartment construction by analyzing the schedule mechanism of typical floor and to show the reasonable time shortening methods by case study. The shown schedule mechanism and basic schedule table can utilize as a guideline in case of scheduling of framework in the existing construction method. Also, the shown time shortening methods by three case studies will guide the direction and process of time shortening while there need time shortening in many-sided projects.

LIFT CYCLE PREDICTION METHOD FOR THE SELECTION OF LIFT EQUIPMENT IN SUPER TALL BUILDING CONSTRUCTION

  • Seo-kyung Won;Choong-hee Han;Junbok Lee
    • International conference on construction engineering and project management
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    • 2009.05a
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    • pp.153-160
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    • 2009
  • The demand for super tall building construction is increasing worldwide. There has been a constant request for achieving early payback on investment by shortening the construction time. This pertains especially for the case of huge investment projects such as super tall building construction. It is very important to shorten the construction time for the building framework, which requires substantial construction time and cost, and this is directly related to the establishment of an optimum lift plan for construction. When there is a problem in the selection of the lift equipment, it is almost impossible to revise the selection, resulting in a possible failure of the project. Thus, the purpose of this study is to analyze the function and logic for the development of the process for the selection of lift equipment for super tall building projects and further development of making the analyzed process into a system. In line with this research objective, the process of selecting the optimum lift equipment by domestic construction company was investigated and analyzed as well as collecting the actual field data. The actual data were obtained by sensors installed on tower cranes at three construction sites with the help from the construction company.

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A study of the factors affecting delay in apartment projects in Vietnam

  • Luu, Truong-Van;Kim, Soo-Yong
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2007.11a
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    • pp.718-721
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    • 2007
  • Construction schedule plays a key role in project management due to its influence on the project success. Thus, it is important to identify factors affecting construction delay. The major objective of this study is to identify and evaluate factors affecting construction delay in apartment projects in Vietnam. The findings confirmed that financial difficulties of owners and contractors, contractors without adequate experience, non-available materials on time, slow site clearance, inappropriate construction methods, defective works and reworks, and lack of capable owners/project managers are the major causes of delay in apartment projects.

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Nonlinear time-varying analysis algorithms for modeling the behavior of complex rigid long-span steel structures during construction processes

  • Tian, Li-Min;Hao, Ji-Ping
    • Steel and Composite Structures
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    • v.18 no.5
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    • pp.1197-1214
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    • 2015
  • There is a great difference in mechanical behavior between design model one-time loading and step-by-step construction process. This paper presents practical computational methods for simulating the structural behavior of long-span rigid steel structures during construction processes. It introduces the positioning principle of node rectification for installation which is especially suitable for rigid long-span steel structures. Novel improved nonlinear analytical methods, known as element birth and death of node rectification, are introduced based on several calculating methods, as well as a forward iteration of node rectification method. These methods proposed in this paper can solve the problem of element's 'floating' and can be easily incorporated in commercial finite element software. These proposed methods were eventually implemented in the computer simulation and analysis of the main stadium for the Universiade Sports Center during the construction process. The optimum construction scheme of the structure is determined by the improved algorithm and the computational results matched well with the measured values in the project, thus indicating that the novel nonlinear time-varying analysis approach is effective construction simulation of complex rigid long-span steel structures and provides useful reference for future design and construction.

Risk-Incorporated Trajectory Prediction to Prevent Contact Collisions on Construction Sites

  • Rashid, Khandakar M.;Datta, Songjukta;Behzadan, Amir H.;Hasan, Raiful
    • Journal of Construction Engineering and Project Management
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    • v.8 no.1
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    • pp.10-21
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    • 2018
  • Many construction projects involve a plethora of safety-related problems that can cause loss of productivity, diminished revenue, time overruns, and legal challenges. Incorporating data collection and analytics methods can help overcome the root causes of many such problems. However, in a dynamic construction workplace collecting data from a large number of resources is not a trivial task and can be costly, while many contractors lack the motivation to incorporate technology in their activities. In this research, an Android-based mobile application, Preemptive Construction Site Safety (PCS2) is developed and tested for real-time location tracking, trajectory prediction, and prevention of potential collisions between workers and site hazards. PCS2 uses ubiquitous mobile technology (smartphones) for positional data collection, and a robust trajectory prediction technique that couples hidden Markov model (HMM) with risk-taking behavior modeling. The effectiveness of PCS2 is evaluated in field experiments where impending collisions are predicted and safety alerts are generated with enough lead time for the user. With further improvement in interface design and underlying mathematical models, PCS2 will have practical benefits in large scale multi-agent construction worksites by significantly reducing the likelihood of proximity-related accidents between workers and equipment.

Developing Computer Integrated Construction Methodologies to Improve Quality of Asphalt Pavement (아스팔트 포장의 품질향상을 위한 정보화 시공법 개발)

  • Lee Heejune
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.208-213
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    • 2001
  • The current progress in computer and electrical engineering has enabled the construction industry to implement innovative technologies in design and engineering. However, the construction segment is still largely based on experience, and this makes it difficult to meet the recent rigorous specifications, especially in the highway construction. This paper describes the current progress and the findings in the development of the computer integrated asphalt paving system, which is expected to assist the equipment operators to construct the quality pavement. The technologies to collect the required information, preferably in real-time, were reviewed comprehensively, and the selected technologies are proposed for the future development. Positional and thermal data were collected at the sample project in real-time to verify the capability of the available technologies. The collected data was analyzed using multiple regression method to confirm the significant factors for the compaction of the sample project, and to develop the empirical model, which can be adopted in the future system.

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An Experimental Study for Cement Setting Property of Wood Chip Board Using Construction Waste Wood (건설폐목을 이용한 목질계보드의 시멘트응결 특성에 관한 실험적 연구)

  • Kim, Sae Hoan;Oh, Sae Chool
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.1
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    • pp.80-86
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    • 2007
  • In this study we experimented setting time and basic properties as waste wood fiber and sodium silicate substitution rate to reuse waste wood fiber produced in construction field to wood chip board. To do this construction waste woods were crushed with the size less than 10mm, mixed with the rate of 1:2, 2.5, 3, and added sodium silicate with the rate of 0, 5% of cement content. The results are as follows. As the substitution rate of construction waste wood was increased delay of setting time was also increased, and the batch of adding 5% accelerator had a 13~17 hours faster setting time than non accelerator batch. The compressive strength was lower as wood substitution rate was higher, and as the specific gravity was higher, the strength was also higher. As wood substitution rate was higher, heat conductivity was lower, and as specific gravity was higher, heat conductivity also was higher.

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A STUDY ON SPACE ZONING BY COMPUTING IDLE-TIMES IN CONSTRUCTION PROCESSES

  • Sang-Min Park;Won-Suk Jang;Dong-Eun Lee
    • International conference on construction engineering and project management
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    • 2013.01a
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    • pp.509-512
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    • 2013
  • An inappropriate space zoning plan causes the unnecessary transportation of construction material and equipment among work areas and increases the disorder of work space. Space zoning is an essential operation management technique which contributes to reduce the process and/or operation idle-time. This paper introduces a method that computes the idle-times between construction operations (or processes) by using Web-CYCLONE. It allows computing with idle-times that affect the construction productivity. Using the idle time between operations and between processes, it computes the optimal number of zones and finds the optimal combination of zones that minimize the idle times. The method contributes to minimize the idle times relative to the operation schedule using complete enumeration. This paper presents the system prototype in detail. A case study is presented to demonstrate the system and verifies the validity of the model. It allows a project manager to establish space zoning plan that effectively segregates a project into optimal number of construction zones and to assign the constrained resources (e.g., laborer, equipment).

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