Welwyn Garden City to Slough

JSM was appointed by a major telecoms client on behalf of a third part client to deliver a new network. JSM delivered this complex project in its entirety including surveys, redesign, construction, fibre installation and testing.

The route was approximately 130m long and travelled through 4 London Boroughs, as well as, the districts of Hertfordshire, Buckinghamshire and Slough Borough Council.

It also crossed a number of structures and land belonging to CRT, Network Rail, LUL and TfL, requiring extensive stakeholder management and negotiations to obtain the required permits and licences to cross their properties and structures.

Due to its length, the route was divided into 9 spans to optimise the programming and delivery of the project. Our planning department surveyed and reviewed the whole route identifying along the route any opportunity for redesigning the route to reduce the delivery timescales, minimise disruption and/ or avoid difficult structures or properties, for example belonging to Network Rail.

Key Project Deliverables

  • Civils – trial holes, excavations, backfill reinstatement in verges, footways and carriageways, HDD on some spans of the route, JSM installed 1 new 110mm duct. JSM built 473 pulling and joint chambers; Traffic Management including specialist TM; Installation along canal towpaths;
  • Canal works including providing and managing works on barges and managing access to towpaths on pontoons;
  • Cable installation – 130km of 432 fibre optic cable (loose tube);
  • Installation and splicing of 64 joints approximately every 2 kms;
  • Test result packages consisting of Chromatic Dispersion (CD) and 1550nm Polarisation Mode Dispersion (PMD) Testing;

Along the route nearly 100 SEDs including bridge structures, culverts, rail lines and canals presented their own unique challenges requiring specific engineering solutions. Overall all challenges were successfully managed through redesign and strong negotiations skills and JSM’s ability to adapt the programme of works.