85 Grays Inn, UK

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Project Summary:

Murphy Geospatial UK Ltd carried out a structural analysis survey, on nominated structural elements within a building in Central London, using non-intrusive and intrusive testing, on behalf of the client.

Figure 1
Scope of works – Roof slab

The Brief/clients:

The purpose of the survey was to determine the construction details of the reinforced concrete frame elements, including beams, columns, slabs, and walls. The construction details to be determined are the external size of the elements, reinforcement layout and variations within, and any other details related to their construction.

The investigation was undertaken on all levels, from the Basement to the Fourth Floor. The results of this survey will be used to help to plan future work.

The challenges:

Our work: The survey was undertaken using a combination of non-destructive testing (NDT) and intrusive investigation methods. A NDT survey is based on a High Frequency Impulse Radar method (HFIR). This method allows to resolve anomalies within the material below the ground surface. Electro-magnetic energy in the form of radio waves is sent into the ground via a transmitting antenna. The energy propagates throw the different materials encountered as a function of their electrical properties, which is in turn function of their physicals and chemicals properties.

Intrusive investigation comprised of:

• Core drilling within the concrete elements
• Breakouts into the concrete elements
• Depth of carbonation testing
• Dust samples collection for chloride content analysis

Team: Specialist Engineer Services Department (Kyle Olajorin-PM, Danuta Pawlak-Geophysicist)


Figure 1: Roof Soffit Slabs, Location RS1


For more information on this project, please contact Paraic at pquirke@murphygs.ie or +353 86 467 1761

  • Client

    GPF Lewis LLP

  • Sector/Market


  • Services

    Subsurface InvestigationAerial / UAV SurveysTopographical SurveysProperty Consultancy

  • Location

    London, UK

Services Used

Subsurface Investigation and Mapping

Subsurface Investigation

Aerial or UAV Surveys

Aerial / UAV Surveys

Topographical Surveys - Murphy Geospatial

Topographical Surveys

Property Consultancy - Murphy Geospatial

Property Consultancy

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