Tunnels are essential to modern infrastructure. NATM(New Austrian Tunneling Method) and
TBM(Tunnel Boring Machine) are most widely used methods to drill a tunnel. Both methods definitely
need to be stabilized with reinforced concrete on the drilled surface.

TBM·PC

APPLICATION

BUNDREX offers a wide range of products that can be ideally used for NATM and
TBM method depending on tunnel conditions.

The benefits of the TBM/Precast reinforced with steel fibers

Increases the crack control, impact resistance and durability of the precast.

SFRC precast segmet for TBM (Tunnel Boring Machine)

Shield TBM method, widely used to drill a tunnel, requires also to install precast segment which are reinforced with steel fibers replacing the current rebar.

Advantages of SFRC precast segment for TBM

It improves the durability of the precast reducing the manufacturing time and the steel material cost.

Advantages of BUNDREX®

    • Benefits

      - Improved productivity by reducing part/all of rebar giving effects of smooth dispersion of concrete and multi-directional reinforcement of steel Fiber

      - Increases crack control, impact resistance and durability of the precast reducing crack or breakage of joint between the segments cause by jack thrust

      - Secures refractory performance by combining with synthetic Fiber preventing high-strength concrete spalling and increasing residual strength
        after fire exposure

    • Cost-effectiveness

      - Reduces labor costs, as no reinforcemen assembly process is
         required

      - Reduces construction cost due to shortened construction period

      - Reduced working hours and construction costs

    • Quality

      - Streamlined work process; rise in quality and safety

Precast

  • Features of BUNDREX®

  • Other Application for Shotcrete

SFRC precast segment for TBM

Shield TBM method is widely used to drill a tunnel where it is under sea, it has weak ground or blasting is not possible.
The method is to install precast segment lining after excavating ground with TBM (Tunnel Boring Machine).
In the past, rebar was mainly used for reinforcement of precast segment but as the performance of steel fiber is enhanced a lot recently, rebar is being replaced with steel fiber.
BUNDREX offers steel fibers that fits well to precast segment.

Advantage of Steel fiber Reinforced Sprayed Concrete (vs. Mesh)

SFRC Precast Segment Manufacturing Process

The production of segment is a lot simpler because rebar cage process is not required. Productivity is improved and production cost is reduced.
  • Segment Manufacturing Process

Performance of BUNDREX®

Precast Tunnel Segments in Concrete Reinforced with BUNDREX Steel Fibers
TBM projects performed in Korea, Japan, US, Canada and others.

TBM Construction Performance

Tunnels are essential to modern
infrastructure.
NATM(New Austrian Tunneling Method)
and TBM(Tunnel Boring Machine) are most
widely used methods to drill a tunnel.
Both methods definitely need to be stabilized
with reinforced concrete on the drilled surface.

TBM·PC

APPLICATION

BUNDREX offers a wide range of
products that can be ideally used for
NATM and TBM method depending on
tunnel conditions .

The benefits of the TBM/Precast reinforced with steel fibers

Increases the crack control, impact resistance and durability of the precast.

SFRC precast segmet for TBM (Tunnel Boring Machine)

Shield TBM method, widely used to drill a tunnel, requires also to install precast segment which are reinforced with steel fibers replacing the current rebar.

Advantages of SFRC precast segment for TBM

It improves the durability of the precast reducing the manufacturing time and the steel material cost.