PRAYED CONCRETE, IN-SITU CONCRETE AND TUBBING SEGMENTS
Fast and dependable reinforcement in tunnel construction.
Regardless of whether a tunnel is being driven by conventional machinery or by a tunnelling machine, KrampeHarex® supports tunnellers in all aspects of reinforcement work by providing the necessary know-how, technical solutions and services – all from a single source. Our range includes a wide variety of fibre types for all project-related demands on the concrete. On request, we can also assume responsibility for assuring the quality of the sprayed concrete, in-situ concrete or tubbing segments. Based on our many years of experience, we combine reinforcement and fire protection in an optimal manner.
On the basis of structural and fire protection calculations, we determine the safest and most economical fibre content for you.
By choosing KrampeHarex® as your partner, you can rely on optimised fibre concrete and rapid construction progress.
Because we know why.
of fibre concrete
in tunnel construction
TUNNEL CONSTRUCTION METHODS
Disadvantages of conventional reinforcement in tunnel construction
- The surface of the concrete is unprotected and susceptible to damage resulting from the greater spacing with classic reinforcement.
- Installation of the steel bar reinforcement is considerably more time-consuming as the reinforcement is applied in a separate work step.
- Very complex reinforcement situation with an irregular surface and holes.
- Complex and close-mesh reinforcement can easily result in “spray shadows” (voids), which in turn can quickly lead to water ingress and further cracks.
ADVANTAGES OF FIBRE CONCRETE IN TUNNEL CONSTRUCTION
- Lower maintenance costs thanks to reduced cracking.
- Concrete surface is much less sensitive to potential damage.
- Faster completion of the tunnel through time- and cost-saving construction processes.
- Simple handling: Only one step in the reinforcement process as the fibres are applied together with the concrete.
- There is no need for temporary support because conventional reinforcement isn’t installed and the sprayed concrete can be applied directly as a finished layer.
- Significantly increased service life thanks to the greater durability of fibre concrete.
- High fire resistance when PP fibre concrete is used.
Tunnel construction around the globe: Experience in the field with KrampeHarex®
Reinforcement with fibres from KrampeHarex® copes with these load conditions better than conventional reinforcement in the form of tubbing segments does.
FASTER STRIPPING OF THE TUBBING SEGMENTS
The tubbing segments can be stripped after just 6 hours. This increases production performance.
As the fibres are uniformly distributed in the components, up to 7 tubbing segments can be stacked on top of each other without any risk of breakage.
TRANSPORT WITH LESS DAMAGE
Thanks to the uniform distribution of the fibres, the tubbing segments are also more stable against vibration and impact shocks during transport.
GREAT STABILITY DURING INSTALLATION
When installing with the aid of a tunnelling machine, high loads act on the components. Here too, the stability of fibre concrete is an advantage.
After installation, a wide variety of forces act on the tubbing segments. This is where fibre concrete proves to be extremely durable and resilient.
Advantages of fibres for fire protection
Fire protection in tunnels A hot topic