GPR Survey in London

PROJECT

Major Building Assessment – the following highlights the work carried out on this Building Assessment.

BREAKDOWN

  • GPR Survey
  • Deep Foundation Scanning
  • Trial Pitting
  • Visual Inspection
  • Breakout
  • Reinstatement
  • Lab Analysis
  • NDT reporting

DURATION

6 Weeks | Dayshift | 3 Teams

TECHNOLOGY APPLIED

  • GPR (Proceq GPR Live & GSSI StructureScan™ Mini)
  • GSSI 4000+ Deep Transducers

Due to the sensitive nature of many projects HTA carry out, specific details cannot be shared publicly. However, if the above sound similar to a project you would like guidance on please call 01707 327 785.


NB

Today there is a fundamental lack of understanding of the technology that can aide in the investigation of a post tensioned bridge assessments.

Hidden voidage detection is complex in nature and employment of technology is vital. Therefore, its application will always demand experienced and trained engineers are carrying out such work.


1. Not all NDT is created equal
All GPR units and Ultrasonic devices are not created equally, plus GPR will not work in all instances and the same goes with ultrasonics.

It is vital to know when to apply one device over the other and often a blend of both is required for the most accurate data.

2. Setup determines Effectiveness
These devices are not plug and play. A set-up too far one way and what your testing can appear as though there are no defects / voids, a set-up at the opposite will show major problems.

Understanding how to set-up and know what you are reading is a reflection of what is expected on the asset that is being scanned is vital. The data required will be determining remedial works or asset closure due to danger to life damage.

Effective use ONLY comes from training and hands on experience.

3. Know how to interpret on site data.
It is paramount to know what you are looking at on the screen and whether that correlates with the what is known about the structure being tested. This must be done on site.

A 3rd party cannot accurately determine data after the event and also cannot make an important judgement call.


Warren Thomas

Written by 

Director of Henderson Thomas Associates Limited (HTA) I welcome you to connect with me and ask any questions about HTA and those we have worked alongside and completed projects for. I have been working in the testing and inspection division covering civil engineering sector for over 30 years and have run some of the largest Materials and Testing Laboratories in the UK prior to forming Henderson Thomas Associates Limited