|M.Sc Student||Shriki Mordechay|
|Subject||Investigation of Tower-Crane Cycle Times as a Basis for|
Productivity Improvement in Construction Projects
|Department||Department of Civil and Environmental Engineering||Supervisor||Professor Emeritus Aviad Shapira|
This thesis is about the investigation of tower-crane cycle times as a basis for productivity improvement in construction projects. Since the start of their use, and in an increasing manner, tower cranes have constituted the main transportation equipment on construction sites. Therefore, it is only natural that selection of cranes, determination of their on-site positioning, study of their employment and implications their use has on construction output and on-site safety should be cardinal issues in the execution planning of construction projects, as well as subjects for continuous improvement attempts. The technical literature deals only sparsely with this subject, and in the framework of the present study’s literature survey only a few publications were found on the subject. The objective of the present study was to identify the potential of novel technological means for improving the productivity at construction sites that are based almost exclusively on tower cranes. The research focused on an investigation of tower crane cycle times. It was based on time analyses and input tracking of crane work at active sites. Time analyses and tracking were conducted primarily for sites in which artificial vision systems (MARAM) for use on tower cranes were recently introduced. During the study, cycle times were found that are characteristic of modern construction sites. Potential time savings when using visual aids were investigated and a transformation model was developed to compare data sets gathered under different geometric conditions. Synthetic standard times were determined for various activities, which constitute a database enabling prediction of cycle times for various transport tasks.