Abstract
Estimating the actual production rate of construction machinery which clearly differs from nominal production provided by machinery manufacturers always is a critical challenge in construction projects execution. Studies indicate that true estimation of actual production is a key element in estimating the time and cost required to terminate construction operations. However, current literature shows that it is still a quite challenging to estimate actual production. In particular, there are various independent parameters that affect the actual production rate. Understanding the role and importance of each parameter could lead to an accurate estimation for production rates. To this end, this paper presents a statistical-based approach to find the discrepancies between the nominal and actual production rates of crawler-type dozers and to understand how various parameters could affects the actual production rates. The data for the actual production of machine were records from productivity measurement of 39 dozers. Working condition, type of materials, and ground slope are three main independent parameters considered and evaluated for each machine. The results obtained from statistical analyses on the data and a comparison between these results with the data provided by Caterpillar and Komatsu manufacturers show a) the discrepancies between the actual and nominal hourly production, b) the effect of individual parameters on actual production, and c) the relationship between machinery working age and discrepancies. The findings of this study could be a unique help for project managers in planning of machinery and equipment in a project site.
Highlights
Introduction and MotivationConstruction machinery and equipment are one of the necessary resources to the accomplishment and success of construction projects
The success of a construction project is highly connected to its machinery production, and it has been universally accepted that the machinery hourly production is the key factor in success of construction projects [1,3,6,7,8,9,10,11,12]
Since the ideal conditions considered by manufacturers could rarely be achieved in real construction projects, the actual production could differ with the nominal production
Summary
Introduction and MotivationConstruction machinery and equipment are one of the necessary resources to the accomplishment and success of construction projects. Today contractors undertake many types of construction activities that require different types and sizes of machinery and equipment [1], and they typically invest the largest value of project costs in machinery and equipment for the equipment-intensive projects [2,3]. In this context, adequate knowledge of machinery and equipment management critically needs to decrease various risks associated with increasing the overall project cost. Since the ideal conditions considered by manufacturers could rarely be achieved in real construction projects, the actual production could differ with the nominal production
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