JGL Corporate brochure - Flipbook - Page 55
Weather
We experienced several very cold days during
January, with temperatures ranging from –8°C
to 0°C. This caused significant issues in getting
equipment to site and carrying out works, with
materials and equipment freezing.
These issues were overcome by clearing access
roads, ensuring all personnel were kept warm
while working, and implementing regular
breaks to maintain safe working conditions.
Remoteness of the project
The remote location of the project also
presented challenges. Communication with
suppliers was required to direct them to site,
with language barriers occasionally causing
difficulties. In some cases, it was easier to track
suppliers’ locations and go out to meet them
directly.
Technical details
The works comprise a total of four shafts. The
shaft construction includes a 5.5 m internal
diameter, 5 m deep drive shaft and a 3.66 m
internal diameter, 5 m deep reception shaft,
with all shafts constructed using segmental
construction.
The tunnel size consists of a 900 mm internal
diameter undertrack crossing, with UTX1 measuring 27.45 m in length and UTX-2
measuring 51.02 m in length. The tunnel lining
comprises concrete with an Aqua pipe.
The works were carried out using trenchless
methods, with open cut not applicable.
Construction of the UTX-1 drive shaft collar
took place on 27 October 2025. During shaft
excavation, a high quantity of boulders was
encountered, some of which were quartz, an
extremely hard material with strengths of up to
320 MPa.
Joseph Gallagher Group | CORPORATE PORTFOLIO | 2026
55
