JGL Corporate brochure - Flipbook - Page 40
06.
Case studies, our projects
HS2 WORKS, SOUTH RUISLIP
A complex shaft and underground infrastructure
project delivered for HS2, showcasing expertise
in deep excavation, structural engineering and
multidisciplinary coordination.
Client:
Main contractor:
SCS Railways
HS2
Sector:
Rail infrastructure
Project duration:
2022-2026, 4+ years
Scope of works
Joseph Gallagher delivered a full civil and structural package for the South Ruislip
Ventilation Shaft, including the construction of two deep shafts, associated headhouse
structures, and underground connections.
Works included:
»
Deep excavation and construction of main and satellite shafts
»
Reinforced concrete base slabs, walls, and secondary linings
»
Construction of the ventilation basement and headhouse structure
»
Installation of maintenance adit (tunnel connection)
»
Comprehensive temporary works, lifting systems, and access solutions
»
Integration of MEP interfaces, cast-in components, and drainage systems
»
Delivery of multiple variation works, including waterproofing, steel installation, and
diaphragm wall repairs.
Technical Overview
40
»
Two shafts constructed:
Main shaft: 22m diameter, 36m deep, Satellite shaft: 14m diameter, 19.5m deep
»
Ground conditions: London Clay, Concrete: 13,500m³+
»
Excavation (muck away): 41,000m³+
»
Reinforcement steel: 2,600 tonnes
»
Waterproofing: 5,600m²
Joseph Gallagher Group | CORPORATE PORTFOLIO | 2026
