Working Platforms for Tracked Plant - Experience from 13 Years of Best Practice-Paper

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The paper reviews 13 years of UK experience with safer working platforms for piling rigs and other tracked plant. Before the initiative, rigs overturning on weak ground posed serious risks to life, productivity, and reputation. In 2004, the Federation of Piling Specialists (FPS), supported by BRE guidance, introduced a coordinated approach that substantially improved industry practice and reduced instability incidents.<br /><br />The initiative established three key steps: estimate the ground pressures imposed by rigs in different operating modes; design granular platforms to withstand those pressures; and manage specification, construction, inspection, and maintenance through a Working Platform Certificate. The certificate helped embed the process across the construction industry.<br /><br />Rig pressures are calculated from the equipment’s weights, geometry, and operating loads. The FPS spreadsheet supports these calculations, but must be used by a competent person and within its assumptions. Pressure calculations for platform design are distinct from calculations demonstrating a rig’s inherent stability. Designs must consider the most adverse operating condition, including loads on tracks and any footpads or outriggers.<br /><br />Reliable information about near-surface soils is essential, particularly on variable brownfield sites. Investigation and proof-rolling should identify weak areas, while platform installation requires rigorous inspection. The widely used BRE 470 method estimates platform thickness for specified soil conditions, but has limitations; alternative or reinforced-platform methods may be harder to verify and are not universally applicable. Dynamic and wind effects should also be considered where relevant.<br /><br />The paper concludes that technical guidance alone was not enough: improving safety required a change in industry culture and management. The FPS initiative and Working Platform Certificate made systematic platform design and control routine in the UK. Although design methods continue to develop, the initiative’s contribution to safer piling operations and improved productivity is firmly established.

Keywords

safer working platforms

piling rigs

tracked plant

ground pressures

platform design

Working Platform Certificate

BRE 470

rig stability

proof-rolling

construction safety