Tunnel Lining Formwork

Zolo in-situ tunnel lining formwork is a very efficient and cost effective construction method for drill and blast tunnel.

Inquire Now

Zolo  automatic hydraulic tunnel formwork is the equipment to make the concrete lining for the tunnel in one time, with the advantages of good concreting quality, high-speed of installation and removal of the form, easy operation and safety. 

The empty gantry allows the transport vehicles to pass. The motor gearbox is adopted to drive the whole

equipment, the formwork is fully hydraulic, with hydraulic cylinder to prop & strip, and lock mechanically.


1. Humanization &automation: reduce labor costs, improve construction efficiency and reduce construction risks.

2. Universality: standardization production makes  a large number of standard parts in equipment, to promote the Zolo tunnel formwork universality and repeat-use.

3. Finite element analysis: calculation of force optimization structure, under the premise of ensuring strength, reducing the amount of steel used in the equipment, reduce construction costs.

4. Tailor-made: 6m, 9m, 10m, 12m or designed according to customer requirements.

Demo Designs

Tunnel lining is the process of creating a protective structure inside a tunnel using formwork to shape and support the concrete during construction. Below are descriptions of various tunnel lining formwork demo designs:

Zolo Windbreak Open Cut Tunnel Lining Fromwork Design

Tunnel Lining Formwork

Zolo Double Line Tunnel Lining Formwork Design

Tunnel Lining Formwork

Zolo Single-Line Tunnel Lining Formwork

Tunnel Lining Formwork

Circular Formwork System:

Design: Utilizes a series of interlocking circular formwork segments to create a seamless tunnel lining.

Advantages: Offers uniformity and ease of installation in tunnels with circular cross-sections.

Applications: Suited for tunnels such as those in metro systems or utility passages.

Segmental Arch Formwork:

Design: Consists of precast concrete segments that form an arch when assembled.

Advantages: Allows for modular construction, speeding up the tunneling process.

Applications: Commonly used in transportation tunnels like highways and rail networks.

Sprayed Concrete Lining Formwork:

Design: Involves the use of a support structure to facilitate the spraying of concrete onto tunnel walls.

Advantages: Provides flexibility and efficiency in creating tunnel linings with irregular shapes.

Applications: Suitable for tunnels where traditional formwork may be challenging due to complex geometries.

Rectangular Formwork for Square Tunnels:

Design: Employs rectangular formwork to create a lining for tunnels with a square or rectangular cross-section.

Advantages: Ideal for utility tunnels and underground passages with non-circular shapes.

Applications: Commonly used in infrastructure projects for sewage, water conveyance, or cable tunnels.

Customizable Modular Formwork:

Design: Adaptable formwork system with interchangeable components for creating diverse tunnel shapes.

Advantages: Offers versatility in accommodating various tunnel profiles and dimensions.

Applications: Suited for projects with changing tunnel geometries or custom requirements.

Hydraulic Formwork Systems:

Design: Incorporates hydraulic systems to adjust formwork elements, ensuring precision and efficiency.

Advantages: Allows for real-time adjustments, reducing the need for manual interventions during construction.

Applications: Particularly useful in tunnels with challenging ground conditions.

Double-Oval Formwork for Twin-Bore Tunnels:

Design: Specifically designed for twin-bore tunnels, featuring two oval-shaped formwork systems.

Advantages: Enables simultaneous construction of parallel tunnels, improving project timelines.

Applications: Suitable for highway and rail projects with multiple parallel tunnels.

Tunnel Lining Formwork Instructions

Tunnel lining formwork is a crucial aspect of constructing tunnels, providing support and shaping for the concrete lining. The working process of Tunnel lining formwork is as follows:

Tunnel lining formwork is a crucial element in the construction of tunnels, providing support and shape to the inner surface of the tunnel. The process involves several key steps:

Design and Planning:

Before starting the tunnel lining formwork, engineers design and plan the formwork system based on the tunnel specifications, dimensions, and structural requirements.

Material Selection:

Choose appropriate materials for the formwork, considering factors such as strength, durability, and ease of assembly and disassembly.

Assembly of Formwork:

Erect the formwork structure inside the tunnel using pre-designed components. This structure will define the shape and dimensions of the tunnel lining.

Placement of Reinforcement:

Install any required reinforcement, such as steel bars or mesh, within the formwork. This reinforcement enhances the structural integrity of the tunnel lining.

Concrete Placement:

Once the formwork and reinforcement are in place, concrete is poured into the space between the formwork and the tunnel excavation. This is often done in sections or rings.

Curing and Setting:

Allow the concrete to cure and set. This process ensures that the concrete gains the necessary strength before the formwork is removed.

Formwork Removal:

After the concrete has sufficiently cured, carefully dismantle and remove the formwork. This step requires precision to avoid damaging the newly formed tunnel lining.

Quality Control:

Inspect the tunnel lining for quality and adherence to design specifications. This may involve testing the concrete for strength and checking the alignment and smoothness of the lining.

Finishing Touches:

If necessary, apply additional finishes or coatings to the tunnel lining to enhance durability, waterproofing, or other specific requirements.

Continuation of Tunnel Construction:

Once the formwork is removed and the lining is in place, construction activities inside the tunnel can continue, such as the installation of utilities, tracks, or other infrastructure components.

Throughout the entire process, safety measures should be in place, considering the confined space and potential hazards associated with tunnel construction.

Need a quote?Zolo product manager always welcome you to call back.

+86 311 8783 3311
+86 199 4348 2237
Write Us

Whether you’d like to get more info on what, why and how we do what we do, need help with what you’re creating, would like to partner up or just say hi!---we’d love to hear from you.