shotcrete machine for TBM

Concrete spraying machine is essential for lining tunnels, and the process is commonly known as shotcreting. This method is widely used in tunnel construction for ground support, stabilization, waterproofing, and structural reinforcement.

Pea stone shotcrete machines must be capable of spraying concrete containing pebbles (typically 5-20mm in size). Their pumping system must thoroughly mix the aggregate with cement slurry using high pressure (10-25 MPa), ensuring a shotcrete layer density of ≥95%.
Main application scenarios include:
Tunnel/mine support: Spraying pebbles to create a flexible support layer that adapts to geological deformation.
Slope reinforcement: Spraying fiber-reinforced concrete containing pebbles to improve shear strength.
Building exterior wall restoration: Spraying pebbles to create a finishing layer for enhanced durability.

Concrete sprayers use high-pressure spraying technology to evenly apply concrete or mortar to target surfaces. They are widely used in tunnels, mines, slope reinforcement, building exteriors, and underground structures. Their core advantages include: Efficient construction: Spraying speeds far exceed those of traditional manual plastering, enabling a daily production capacity of hundreds of square meters.
Optimized quality: Reduced material waste (rebound rate as low as 5%-15%), high-density spray coatings, and improved impermeability by over 30%.
Adaptable to complex structures: Precisely conforming to curved and irregular surfaces (such as tunnel vaults) without the need for formwork support.

Pea Gravel Concrete Spraying Machine is a kind of mechanical equipment specially used for spraying gravel concrete (or concrete containing aggregate). It is widely used in support operations in underground engineering and civil engineering fields such as tunnels, subways, culverts, and slope protection.

The shotcrete system used by TBM (Tunnel Boring Machine) is a key equipment for timely support of surrounding rock in tunnel construction. Its core function is to mechanically spray concrete at high speed onto the excavation surface to form a support layer to stabilize the surrounding rock.