A Multi-project Scheduling Procedure for Transportation Projects
Engineering Research Institute, Iowa State University, 1993 - Highway departments - 130 pages
This report proposes, that for certain types of highway construction projects undertaken by the Iowa Department of Transportation, a scheduling technique commonly referred to as linear scheduling may be more effective than the Critical Path Method scheduling technique that is currently being used. The types of projects that appear to be good candidates for the technique are those projects that have a strong linear orientation. Like a bar chart, this technique shows when an activity is scheduled to occur and like a CPM schedule it shows the sequence in which activities are expected to occur. During the 1992 construction season, the authors worked with an inlay project on Interstate 29 to demonstrate the linear scheduling technique to the Construction Office. The as-planned schedule was developed from the CPM schedule that the contractor had developed for the project. Therefore, this schedule represents what a linear representation of a CPM schedule would look like, and not necessarily what a true linear schedule would look like if it had been the only scheduling technique applied to the project. There is a need to expand the current repertoire of scheduling techniques to address those projects for which the bar chart and CPM may not be appropriate either because of the lack of control information or due to overly complex process for the actual project characteristics. The scheduling approaches used today on transportation projects have many shortcomings for properly modeling the real world constraints and conditions which are encountered. Linear project's predilection for activities with variable production rates, a concept very difficult to handle with the CPM, is easily handled and visualized with the linear technique. It is recommended that work proceed with the refinement of the method of linear scheduling described above and the development of a microcomputer based system for use by the Iowa Department of Transportation and contractors for its implementation. The system will be designed to provide the information needed to adjust schedules in a rational understandable method for monitoring progress on the projects and alerting Iowa Department of Transportation personnel when the contractor is deviating from the plan.
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500 Distance stations 63rd Street activity description activity that progresses areas As-Built Linear Schedule as-built schedule AutoCAD axes BAR CHART SCHEDULE bid items C.P.M. progress schedule Cedar County contractor shall submit contractors plan controlling items CPM schedule critical path Critical Path Method culvert date calendar date Department of Transportation depicted difﬁcult duration earthwork activities eastbound lanes example ﬁeld Figure Figure 17 ﬁnished ﬁrst phase ﬁve days graphically highway construction projects I-80 Inlay project identiﬁed included Indianola inspectors intakes Iowa 92 Iowa Department linear activity linear scheduling application linear scheduling technique mainline paving network diagram occur Partial Time Scaled Pavement Removal paving operation pay items planned working days progress meetings Project Engineer Project II reﬁned relationships between activities research team revised C.P.M. progress Scaled Logic Diagram shown spacial Subbase subcontractor submit 3 copies three projects trafﬁc typically visually westbound