For such large-scale projects, the machine must meet the following requirements:
🔹 Key Features Needed
High Output Capacity: 20–40 m³/h to keep up with the large concrete demand in long twin tunnels.
Long Reach Robotic Arm: ≥ 15–20 m boom reach to cover wide tunnel sections and tall slopes.
Dual Nozzle Option: Some models support two nozzles to spray simultaneously in left and right tunnels, improving efficiency.
Stable Pumping System: Continuous, uniform concrete flow to ensure strong adhesion and dense lining.
Dust Suppression & Rebound Reduction: Wet shotcrete minimizes dust (compared to dry method), protecting workers in confined twin-tunnel spaces.
Mobility: Truck-mounted or crawler-mounted type for easy movement between tunnel portals.
Safety Devices: Explosion-proof, automatic overload protection, and emergency stop functions for underground construction safety.
🔹 Typical Applications in Double Highway Projects
Primary Tunnel Support – Spray concrete immediately after excavation to stabilize rock.
Final Lining – Provides smooth, durable tunnel walls.
Slope Protection at Portals – Spray on cut slopes around the highway entrance.
Large Cross-Section Coverage – Dual-lane tunnels require high-output machines with extended boom reach.
👉 For double highway tunnel construction, contractors usually choose truck-mounted wet shotcrete machines with robotic arms, capacity around 30–40 m³/h, and reach up to 37 m to meet efficiency and safety standards.
Would you like us to recommend the exact machine models (with specs like boom reach, capacity, and suitable tunnel size) commonly used in double highway construction projects?
