KrampeHarex Lösungspfeil

Know why
things run
smoothly

SPRAYED CONCRETE, IN-SITU CONCRETE AND LINING SEGMENTS
 Fast and dependable reinforcement in tunnel construction.

Regardless of whether a tunnel is being driven by mined exavacation (NATM) or by tunnel boring machine (TBM), 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.

Advantages
of fibre concrete
in tunnel construction

TUNNEL CONSTRUCTION METHODS
 COMPARED

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.

Fibres for
tunnel construction

Fibre concrete is THE building material with a future.
Its innovation potential is far from exhausted.
Wilhelm Nell, Product- & Business Development Manager, KrampeHarex

Fibres for tubbing segments

Fibre reinforcement for concrete precast elements facilitates more cost-effective production and improved durability.
  • DE 60/0.9 H
  • DE 60/0.9 M
  • DE 60/0.8 M
  • DE 60/1.0
  • DE 60/0.75 N

Fibres for sprayed concrete

Our steel fibres for sprayed concrete ensure easy handling and guaranteed results in tunnels, mines, shafts and other safety measures.
  • DE 35/0.55 N
  • DE 35/0.55 M
  • DE 35/0.60 N
  • DE 35/0.70 N
  • DE 40/0.55 N
  • DE 40/0.55 M

Fibres for fire protection

Our polypropylene microfibres offer the highest levels of safety with respect to fire protection in all tunnel constructions. 
  • PM 3/15
  • PM 3/18
  • PM 6/15
  • PM 6/18
  • PM 6/32

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.

SPACE-SAVING STORAGE

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.

EXTREMELY RUGGED

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

Preventive fire protection has gained in importance in tunnel construction. New concepts demand that the concrete itself has a protective effect. This is made possible by adding synthetic fibres, because these reduce or prevent explosive concrete spalling.

Our polypropylene fibres are the result of many years of research and development. Their fire protection properties have been tested in collaboration with institutes like the Leipzig Institute for Materials Research and Testing (MPFA Leipzig GmbH), and the fibres have already been used in pilot projects like the Leipzig City Tunnel.
without polypropylene fibres
with polypropylene fibres from KrampeHarex®
Know Why
Tunnel construction
100
Tunnel
25 years
experience
50.000
tons of fibre used
550 km
total length

Pferdekamp 6-8 | 59075 Hamm | Germany
T +49 (0) 23 81.977977 | F +49 (0) 23 81.977955 info@krampeharex.com Office hours
Mon-Thurs. 7:00 a.m. – 5:00 p.m.
Fri. 7:00 a.m. – 2:00 p.m. 
Shipping times
Mon-Fri 6:00 a.m. – 2:00 p.m.