|M.Sc Thesis||Department of Civil and Environmental Engineering|
|Supervisor:||Assoc. Prof. Rosenfeld Yehiel|
|Full Thesis text - in Hebrew|
The present study is yet another in a series of studies conducted at the Technion, whose objective is to examine transport cycle times of construction cranes and to develop tools for enhancing productivity and safety of construction cranes. The present study deals with the characterization and development of an improved navigation system for tower cranes, which integrates a semi-automatic navigation system and a decentralized remote control system.
The improved system includes a programmable controller, sensors, a remote control system and a touch screen. Using the improved system, paths and points can be saved in the system memory enabling semi-automatic navigation along such paths and/or semi-automatic navigation to the saved points. Moreover, when required, and under certain restricted conditions (travel velocity, operation time, etc.), the signalperson, can operate the crane using the remote control system, under the supervision and continuous approval of the crane operator.
In the framework of the project, the components of the improved system were characterized and models were developed for semi-automatic navigation and remote control, while examining the safety aspect and determining minimal safety requirements. A prototype system was developed for the operation of tower cranes. The prototype system was mounted on a tower crane and was tested under conditions that simulate construction site conditions and the pouring of a ceiling using a concrete bucket.
During the study, eight navigation paths of different complexity and length were executed and the contribution of the system to enhanced performance was studied, with qualitative reference to safety.
Using the improved system under active construction site conditions led to a change in work patterns of both the crane operator and the signalperson, and resulted in a more efficient utilization of the skills of the two main factors involved in operating the crane, which in turn led to a shorter transport path time.
The improved system not only increased the productivity and efficiency of the tower cranes, but also improved the safety level by bringing the tower crane to the attention of the workers and involving the heads of teams and the signalperson in the navigation process and in its success.