Distance-time diagram (line construction site)

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Example of a path-time diagram

Path-time diagrams are used to represent and plan linear construction projects ( line construction sites ). Concrete examples are road construction, track construction, tunnel construction, pipeline construction, transition construction and bridge construction. In some areas, e.g. B. track construction, the builder requires a path-time diagram when tendering the construction project. This should ensure the quality of the offer and make planning errors visible at an early stage.

The main display effect of a distance-time diagram is the connection of the geographical conditions of the construction site with the chronological sequence . A distance-time diagram shows when and where and at what speed the individual tasks are to be completed. The distance covered is usually shown on the horizontal axis, while the time is shown on the vertical axis. A task is shown as a line. This begins at a start point (start date and start location) and moves to the end point (end date and end location). The gradient of the process thus corresponds to the reciprocal of its speed, i.e. H. a weak slope corresponds to a quick process. If the lines overlap, this indicates collisions and conflicts between the processes. Such conflicts cannot be seen in the classic Gantt chart (bar chart).

For further illustration, a sketch of the construction site can be shown parallel to the path axis. This increases the comprehensibility of the individual processes and their networking / sequence in the measure.

Spatial and temporal closures of certain sections within a construction site area can be shown with a path-time diagram (e.g. breeding areas of protected birds during the construction project). These restrictions can then be visually recognized and taken into account during planning.

Differences and advantages compared to the Gantt chart

Bar chart and network plan are more analytical than path-time diagrams, but fail to provide a visual and procedural link between the project geography and the planned project schedule. Path-time diagrams increase the clarity of a project with spatial expansion enormously:

  • They show the direct connection to the site plan of the construction site and convey what is being built where.
  • Spatially and temporally overlapping processes can easily be recognized.
  • They convey a clear understanding of services through the slope of the task line.
  • They show the effects of changes on the passage of time and on the route.
  • They clearly show the philosophy / structure of the project process.

See also

literature

  • AD Austen, RH Neale: Managing construction projects: a guide to processes and procedures . International Labor Organization, 1984, ISBN 978-92-2106476-3 , pp. 110 ff .
  • Chartered Institute of Building (Ed.): Guide to Good Practice in the Management of Time in Complex Projects . John Wiley and Sons, 2011, ISBN 978-1-4443-3493-7 .
  • Brian Cooke, Peter Williams: Construction planning, programming, and control . 2nd Edition. Blackwell Publishing Ltd, 2004, ISBN 978-1-4051-2148-4 .
  • Albert Hamilton: Managing projects for success: a trilogy . Thomas Telford, 2001, ISBN 978-0-7277-3497-6 .
  • RH Neale, David E. Neale: Construction planning (=  engineering management ). Thomas Telford, 1989, ISBN 978-0-7277-1322-3 , pp. 44 ff .