Site and Ground Investigation

What we can deliver...

Our multi-skilled teams have particular expertise in many SI/GI works, working with and subsequently overcoming difficult access situations.

Our staff are highly adaptable and have experience in rock drilling, metal and paint sampling, and location of buried services.

With our ability to draw upon all our different operational departments, we can effect our own site access and liaise with Government bodies such as Network Rail, Canals and Rivers Trust, Environment Agency etc to effect access permissions.

With this experience and skill set we are able to offer the following:

  • Qualified Geotechnical Engineer led site works
  • Cable Percussive boreholes
  • D1500 bespoke tracked cable percussive rig
  • Ibex slope climbing dynamic sampling and auger rig
  • Rotary Drilled Boreholes
  • Dynamic Windowless Sampling & Probing (Include UT70 sampling Euro Code 7 compliant)
  • Concrete and Masonry Coring
  • Trial Pitting/Slit Trenching
  • Logging to BS5930 / EC7
  • Factual and interpretative Reporting
  • Laboratory Testing
  • NRSWA / Road Closures
  • Ballast Sampling & Contamination Testing
  • Geotechnical Monitoring

Bridgeway is RISQS approved for SI/GI work and is a Principal Contractor to Network Rail, which enables us to supply a full range of ground investigation work.

In addition to this we are able to conduct works in both Greenfield and Brownfield sites.

The SI/GI team comprises the following dedicated staff, which can be supplemented on a project by project basis:

  • Geotechnical Engineers & Operatives
  • Site Team Leaders
  • Rig Operatives
  • Competencies include Network Rail Safety Critical, NRSWA, CSCS & BDA

Projects

Name of Project:HS2 Euston Enabling Works

Project Description:Undertake specified GI at location planned by Arups on behalf of Network Rail IP Managing works for HS2.

  • Phase 1: Set-Up and undertake Principal Contractor Duties for Euston Station
  • Phase 2: Review Desk Study with Arup and NR. Ascertain the best method of investigation for material types expected and plan access accordingly
  • Phase 3: Undertake extensive planning activities for access to all lines within the Euston throat, utilise long possessions for mobilising plant into position to work ALO
  • Phase 4: Execute the GI
  • Phase 5: Demobilisation

Ground investigation equipment and techniques used on this project:

  • Enabling de-vegetation works
  • Road Rail CPT Rig
  • Premier 110 Window Sample Rig (8m)
  • Cabtrak D1500 Cable Percussion Rig
  • Trial Pitting (Hand Dug with revetment to 3m)
  • Dynamic Probing (Geotool 15m)
  • Structural coring of existing retaining wall (7.4m deep) with follow on Hand Held Window Sampling

Challenge:

  • Acting as the interface between the clients (HS2) designers (Arup) & the client (NRIP)
  • Achieving high volumes of locations within pressing possession times in one of the most challenging locations to work
  • Programming works to a very tight timescale due to follow on activities and information requirements to facilitate a D&B Tender
  • Obtaining a reliable sub-contractor to undertake the rail safety case and machine controller duties (TXM Plant)

Achievement:

  • Successfully managing all parties to ascertain a robust scope
  • Liaison with the designer and client to agree ways forward when the initial planned activities did not achieve the results expected
  • Exceeding designed depth with the D1500 and achieving 45m depth in over-consolidated London Clay
  • Good working relationship with the NR project team

Client: Network Rail Infrastructure Projects

Name of Project:Durham Re-Signalling

Project Description: ndertake specified GI at locations planned by Network Rail Project Team to facilitate the design of thirty-nine new signal base locations and six new level crossings.

  • Phase 1: Set-Up and undertake Principal Contractor Duties for the scheme
  • Phase 2: Review Desk Study with NR Project Team
  • Phase 2: Undertake walkover and subsequent access planning for all locations
  • Phase 4: Execute the GI
  • Phase 5: Demobilisation

Ground investigation equipment and techniques used on this project:

  • Enabling de-vegetation works
  • Premier 110 Window Sample Rig (8m)
  • Trial Pitting (Hand Dug with revetment to 3m)
  • Dynamic Probing (Geotool 10m)
  • GPR Survey for location of buried services

Challenge:

  • Acting as the interface between the clients (NR) and all other working parties
  • Achieving high volumes of locations within pressing possession times in one of the busiest freight routes

Achievement:

  • Successfully managing all parties to ascertain a robust scope
  • 98% success rate of planned versus actual on works
  • Despite the 98% success rate project was brought in on time and under original budget with no de-scoped works
  • Good working relationship with the NR project team

Client: Network Rail Infrastructure Projects

Capability Statements