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Grout plant for tunnel project

A grout plant for tunnel projects is a specialized system used in underground construction, especially in Tunnel Boring Machine (TBM) or shielded TBM operations. Its primary function is to prepare and supply grout mixtures used to fill the annular space between the tunnel lining (segments) and the surrounding ground.

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  Content   2025-05-30

A grout plant for tunnel projects is a high-capacity, automated system designed to produce, store, and pump large volumes of grout (cementitious, chemical, or resin-based) for critical tunneling applications. These plants ensure consistent mix quality, rapid delivery, and precise injection – vital for ground stabilization, waterproofing, and segment sealing.

injection pump and mixer
injection pump and mixer

Applications of grout plant for tunnel project:
Shield TBM Tunneling
Pipe Jacking / Microtunneling
Ground Improvement Works
Underground Metro Projects
Mine Tunneling
Sewer & Utility Tunneling

colloidal mixer agitator with pump
colloidal mixer agitator with pump

Types of Grout Used in Tunnel Projects:

Type Composition Use Case
Cement-based Grout Cement, sand, water, bentonite, additives Most common; fills annulus behind segments
Bentonite-based Grout Bentonite, CMC, polymers Low strength, self-leveling; used in soft ground
Two-component Chemical Grout Epoxy, polyurethane, acrylate High-strength sealing; used for water cutoff
Microfine Cement Grout Ultra-fine cement particles For fine cracks and seepage prevention
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Injection grout plant (grouting plant/grouting equipment system) is an integrated equipment system for grout preparation and injection in geotechnical engineering, construction and geological disaster management. Its core functions, technical features and application scenarios are as follows:
Core functions and equipment composition
Grout preparation system
Double-shaft mixer: adopts variable frequency speed regulation technology to achieve accurate proportioning of raw materials such as cement, water glass, bentonite, etc. (proportioning accuracy ±1%) to ensure slurry uniformity.
High-speed pulping machine: through the action of centrifugal force (speed ≥1450r/min), the powder is quickly dissolved, and the preparation efficiency is increased by 40% compared with traditional equipment, which is suitable for ultra-fine cement-based slurry.
Automatic batching system: integrated with screw conveyor, electronic scale and PLC controller to realize automatic metering and transportation of raw materials and reduce manual intervention.
High-pressure injection system
Piston pump group: adopts three-cylinder single-acting reciprocating pump (such as SGB6-10 type), with an output pressure of more than 10MPa and a flow rate of 6-10L/s, supporting single-liquid slurry and double-liquid slurry (cement-water glass) injection.
Intelligent control system: real-time monitoring of grouting pressure, flow and cumulative grouting volume, automatic generation of construction records (in compliance with GB/T 50448-2015 specifications), and support for cloud data storage and traceability.
Explosion-proof design: For high-risk environments such as coal mines, the equipment is equipped with explosion-proof motors, intrinsically safe circuits and pressure relief valves to ensure construction safety.