Enhancing Safety and Efficiency in Heavy Construction Machinery Operations: Design Aspects. The Second Edition of the EFFC/DFI Guide to Working Platforms-PPT Presentation

PPT Presentation

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The presentation examines how to improve the safety and efficiency of temporary working platforms for heavy construction machinery. Reliable design requires a consistent process: define machinery loads and ground conditions, assess worst-case loading, select appropriate soil parameters, use a coherent safety concept and validated calculation method, specify construction details, and verify performance through field testing.<br /><br />Several analytical-empirical design methods are available, including BRE/Meyerhof, CIRIA SP123, Okamura and the Temporary Works Forum (TWf). They use different assumptions and safety factors, so they can produce substantially different platform thicknesses. Results from different methods or safety frameworks should not be combined (“pick and mix”); each method must be applied within its scope and with its own consistent safety factors. The studies also found no clear relationship between platform thickness and machine weight, bore diameter, or drilling depth alone.<br /><br />The platform’s friction angle is a particularly influential design parameter. Increasing it from 40° to 50° can reduce the required thickness by as much as 48% under some approaches, although its influence varies by method. Conservative, verifiable input values and careful consideration of groundwater are therefore essential.<br /><br />A DFI/EFFC field study assessed four in-situ tests: the static plate load test (PLT), light weight deflectometer (LWD), DPL-5, and PANDA. All showed correlations with independent checks, but differed in speed, portability, ease of use, and ability to identify weak spots. Combining test methods can provide a more reliable assessment than relying on a single test.<br /><br />The recommendations are to test both the subsoil and platform materials, use consistent design assumptions and safety factors, estimate track pressures in accordance with EN 16228, and maintain strict quality assurance where higher-strength parameters are adopted. Full guidance should cover investigation, design, verification, and maintenance.

Keywords

temporary working platforms

heavy construction machinery

platform design

soil parameters

safety factors

ground conditions

field testing

plate load test

friction angle

quality assurance