respect the environment and strive to design projects that are more
harmonious with their natural surroundings.
Environmental concerns are viewed as an opportunity rather
than an obstacle
- Trenchless technology for KCRC DB320
- Trenchless technology for CLP tunnels at Tsz Wan
- Reduction of impacts for CLP tunnel at Pui O
- TBM for KCRC at Long Valley
We are keenly aware of our responsibility
to our neighbours and the community and strive to minimise the impact
of our construction activities. As well as careful control
of construction waste we try to use construction techniques
that are more environmentally sensitive.
- Use of EMIS
- Giken ‘silent’ piling method
- Use of environmentally friendly chemicals
- Use of system formwork
- Use of special equipment for diaphragm walls
technology for KCRC DB320
The clients tender design envisaged construction of two railway tunnels using
conventional cut and cover and drill and blast tunnels. Dragages introduced the
Earth Pressure Balance tunnel boring machine into Hong Kong, reducing construction
impacts on the surface and reducing construction waste.
technology for CLP tunnels at Tsz Wan Shan
CLP needed to lay new cables along Tsz Wan Shan Road. Originally intended to
be built using cut and cover techniques, Dragages were able to demonstrate that
a tunnel could be constructed using a rock tunnel boring machine avoiding impacts
to the busy traffic using the roadway.
Reduction of impacts
for CLP tunnel at Pui O
By revising the direction of construction of the CLP tunnel in Chi Ma Wan construction
impacts on local residents have been considerably reduced. In addition, the redesign
has resulted in a much smaller temporary works are, reducing impacts on the environment.
TBM for KCRC at Long Valley
The successful use of Earth Pressure Balance tunnel boring machine technology
at Kwai Ching enabled KCRC to consider the TBM option for the construction of
the tunnels underneath the environmentally sensitive area of Long Valley.
Use of EMIS
Each construction project reviews all environmental risks systematically using
our Environmental Mitigation and Implementation Schedule (EMIS). This process
is used to identify all potential environmental impacts and to develop an effective
set of mitigation measures to ensure that our high standards are maintained.
Giken ‘silent’ piling
Used extensively on the Long Valley tunnel Project for KCRC, the Giken piling
system has been deployed where ever possible because it installs traditional
sheet piles by pushing them into the ground. This piling system is effectively
silent and avoids completely the need to obtain noise permits that are required
for percussive driving methods.
Use of environmentally
For the construction
of tunnels using an Earth Pressure Balance tunnel boring machine
special chemicals must be used
to mobilize the excavated soil. In the environmentally sensitive
works under Long Valley we have taken special care to ensure
that the chemicals to be used are biodegradable and non-toxic.
Use of system formwork
To minimise the use of
timber formwork we try wherever possible to use metal formwork
systems. This reduces the use of timber
and helps to minimise waste. At the same time the system
formwork is designed to provide a safety system of work and
access and also produces a higher standard of workmanship.
Use of special equipment for diaphragm walls
One of the companies
in the group has introduced the revolutionary cutter head system
to excavate diaphragm walls. As well as
providing a higher standard of work this technology results
in a much tidier site, reducing the amount of dirty water
that might be produced and also reduces the amount of accidental
over digging, reducing construction waste.