Tunnelling Injection Systems

Tunnelling injection systems are vital for maintaining the integrity and waterproofing of underground structures. These systems utilise specialised resins and grouts to seal cracks, joints, and voids in tunnel linings, preventing water ingress and reinforcing structural stability. With cutting-edge technology, tunnelling injection systems offer long-lasting solutions to water-related issues and ensure the safety of tunnel operations.

Why Do Tunnels Leak?

Tunnels can experience leakage due to several factors that compromise their waterproofing. Understanding the underlying causes can help prevent further damage and improve the longevity of tunnel infrastructure.

Water Table Fluctuations

High groundwater levels can lead to water seepage into tunnels, especially if the waterproofing systems degrade over time.

Structural Settling

As tunnels settle, gaps can form, allowing water to penetrate through cracks and joints.

Poorly Sealed Joints

If tunnel joints are not properly sealed during construction, water can easily infiltrate these areas.

Ageing Materials

Over time, the materials used in tunnel construction, such as concrete and waterproof membranes, may deteriorate, increasing the risk of water leaks.

External Pressure

Pressure from surrounding soil or construction activities can lead to fractures in tunnel linings, making them susceptible to leaks.

Types of Injection Systems for Tunnelling

Types of Injection Systems for Tunnelling

Tunnelling injection systems offer various types of solutions tailored to different waterproofing and structural repair needs. Below are some of the commonly used injection systems:

Polyurethane Injection

Polyurethane injection is widely used for sealing cracks and voids in tunnel linings. It expands on contact with water, filling gaps and providing a flexible, watertight seal.

Acrylic Resin Injection

Acrylic resins are used in tunnelling to address more extensive cracks and larger areas of water ingress. These systems provide durable sealing and quick-setting properties.

Cementitious Injection

Cement-based injections are used for more stable, permanent solutions in concrete tunnels. These systems effectively bond with surrounding materials, ensuring long-term waterproofing and structural support.

Epoxy Resin Injection

Epoxy resin injections are used for their superior bonding capabilities and resistance to water and chemicals. These systems are ideal for repairing structural damage in tunnels where high durability is required.

Benefits of Tunnelling Injection Systems

Tunnelling injection systems offer several key benefits that help ensure the durability and safety of underground structures:

Enhanced Waterproofing

Injection systems effectively create impermeable barriers that prevent water from entering tunnels, reducing the risk of water-related damage and maintaining the structural integrity of tunnel linings.

Cost-Effective Solutions

Compared to traditional repair methods, injection systems are often more affordable and require less downtime, making them a practical choice for ongoing maintenance and emergency repairs.

Minimal Disruption

Injection systems can be applied with minimal disruption to tunnel operations, making them ideal for maintenance in active tunnels where safety and continuity are crucial.

Durability

The materials used in tunnelling injection systems are designed for long-lasting performance, ensuring that tunnels remain secure and waterproof for many years.