JGL Corporate brochure - Flipbook - Page 50
06.
Case studies, our projects
GUILDFORD STW
RELOCATION SCHEME
A highly-challenging project requiring careful planning and collaborative
stakeholder management for a successful delivery.
Client:
Main contractor:
Sector:
Project duration:
Thames Water
BAM, Enpure JV
Utilities
18 months
Scope of works
Services
As part of the £9.1m Guildford STW Relocation scheme, we
are delivering 1.5km of 1500mm ID microtunnelling across
six sites, including three drive and three reception shafts.
The design and construction of 1375m of 1500mm ID
tunnel, split over five drives of varying length. these were
constructed using a combination of Mirco Tunnel Boring
Machine and hand dig shield, with pipe jacking frame. One
of the drives was complete on a curve, and intermediate
jacking points were used for the longer drives.
Operating in a congested urban environment with
active Thames Water assets, our team safely advanced
TBM drives beneath critical infrastructure - including
live treatment works, a council recycling centre, and
commercial properties - while maintaining uninterrupted
service, minimal settlement, and full environmental
compliance.
Challenges
50
»
Works undertaken in a very confined area
»
Traffic a key constraint, managed through careful planning
»
Phased works and controlled access minimised disruption
»
Activities sequenced to maintain safety and progress
Joseph Gallagher Group | CORPORATE PORTFOLIO | 2026
Auger bore connection 600mm ID – 30m length. Open cut
trench and laying precast concrete pipe line 450mm ID –
40m length. Installation of galvanised access equipment
for future maintenance of the system.
Installation of ductile iron pipe works. Installation of
precast cover slabs between 4m & 12.5m Dia. Casting of
structural benching and RC walls.
