Papers by Keyword: Construction Process

Abstract: Construction waste is a serious challenge that requires particular attention from construction managers to improve the performance of their projects and survive in a highly competitive market. Simulation modeling provides decision-makers with a controllable operating system and a more cost-effective environment which allows a better understanding of construction processes deficiencies. The current paper aims to assess waste in a bricklaying process using ARENA. Data used for simulation modelling were collected through field observations and video recording techniques. Using EasyFit, goodness-of-fit tests were performed to identify the best probabilistic density functions for each construction operation in the studied process. Simulation outputs show that non-value-added (NVA) activities dominate the bricklaying process with 85.2 % of the total cycle time. These results indicate a strong potential for optimizing the process under study by reducing these sources of waste especially regarding waiting time that holds the highest share of waste with 72.5 %.

Abstract: The amount of construction waste (CW) at building sites is highly variable, for instance the CW generation index ranges between 50-300 dm3 per square meters of gross floor area. Today there is still a lack of knowledge about variables (building design, construction process, construction technologies, etc.) affecting the CW generation. The objective of this paper is to analyse the influence of multi-storey building design and some construction processes on the CW generation indexes. The CW generation was analysed for two groups of buildings with two different construction processes; one with plumbing and electric services installed inside the masonry element and the other with plumbing and electric services installed onto the masonry element and covered with water-resistant drywall system (reducing the construction waste generation). The gross floor area directly affects the amount of executed construction works in a building site. Since the most important works (concrete, masonry and cladding) for CW generation is related to gross floor area, gross floor of buildings is also directly related to CW generation. For buildings with gross area varying from 20,000 to 80,000 m2, there is a reduction of approximately 18% of construction waste only changing the plumbing and electric services installation system, from embedded in the masonry element to installed onto the masonry element and covered with water-resistant drywall system.

Abstract: Time is presented as a special category of resource in the investment and construction process influencing directly or indirectly the final economic results of this type of activity. The main emphasis is placed by the authors in the course of justifying their approach on giving consideration in the context of this publication to such parameters as the service live of the ready construction product; investments payback period; duration of object construction; intensity of investment in time; labor productivity, etc. Proceeding from the revealed time losses between designing and construction; preparation to construction and its beginning; inter-shift and whole-shift downtime due to unsatisfactory production discipline; failures to meet the production resources delivery dates; disturbed plans of performing works, a conclusion has been made on the fact that solution of each of the foregoing tasks is the direct time saving and one of the main trends for increasing economic effectiveness of construction. It has been justified that the intensity of investing in time shall grow from a minimum at the initial stage to a maximum at the final stage.

Abstract: Method of network plan in project construction has been widely used, it complies with the requirements of the engineering construction management, organization and management is especially suitable for the construction of the project. At present our country network plan technology in engineering project theory and level with the foreign equivalent, but in the application of project management, especially the lag compared the supervision and control in implementing plan, tracking and adjustment, basically still stay on the preparation of the plan. This paper analyzes the present situation of the application of network technology in construction management, puts forward the ways and methods to improve the application of network planning technology.

Abstract: Accurate simulation of construction process of continuous rigid frame bridge is a foundation to make a bridge built accurately. Based on the suit iteration method, this paper used MIDAS to built a 3D finite elements model, the internal force and deformation results of each construction stage was obtained. This study provided a good theoretical reference for the control of long-span continuous rigid frame bridge construction..

Abstract: A long-span cable-stayed arch bridge is a new form of bridge structure that combines features of cable-stayed bridges with characteristics of arch bridges. In the present study, we derived a practical calculation method for the lateral destabilization critical loading of cable-stayed arch bridges during the construction process based the energy principle. The validity of the method was verified with an example. The calculation method provides a quick and efficient way to evaluate the lateral stability of a cable-stayed arch bridge and a concrete filled steel tubular arch bridge during the construction process.

Abstract: Puli central mall, with super high-rise steel-concrete composite structure, is one of the landmarks in the city of Jinan. During the construction process, the vertical deformation of the structure is crucial. This paper based on the finite element analysis software Ansys, uses the refined finite element method to numerically model the elastic, creep and shrinkage deformation during the construction process, in order to gain the vertical deformation and the difference of deformation between core and frame. The pre-control methods for reducing vertical deformation are proposed for design and construction based on the modeling results and the relevant theory, beneficial to guide the construction process for this project.

Abstract: The preparation and management of the construction process of the pre-construction analysis, pointing out the site materials management throughout the construction process is an important part of a direct impact on the progress and quality.

Abstract: Generating complex forms with the computer has become easier however a challenge still lies in the realization of these forms. Realize the digital fabrication face two challenges: first, how to evaluate the assembly ability of the design; second, how to realize digital fabrication combine with the Traditional technology. This paper introduces that the assembly ability evaluation ideas on design by the method of the combination of System Dynamics and association graph, and it needs to pay attention to the value added chain process fusion with the traditional mode of production in the process of evaluation.

Abstract: In order to control the construction of asphalt pavement more precisely, an analytical hierarchy process (AHP) was used to screen the major control index during the construction process.. The results show that compactness, air void and thickness of surface course are the control indexes affecting construction quality, and are the major factors that lead to early damages. The weights of the three indexes are 0.43788, 0.2614, and 0.1818, respectively. Obvious correlations are shown between compactness and air void as well as thickness of surface. Finally, the compactness is chosen as the control index of construction based on the principle of convenient measurement and used to calculate reliability.