FOUNDATION INSULATION OF STRUCTURE

In a drill tunnel, the tunnel wall is constructed using smaller elements that fit together to form a complete ring. The tunnel boring machine is equipped to place these elements automatically. The final element of the ring is a smaller wedge-shaped piece that secures the entire structure once installed. These tunnel wall elements are typically made of prefabricated concrete and often come with integrated water-retaining layers, sealing rubbers, and connection options for added efficiency and functionality.

Following the installation of the prefab parts, concrete is poured to stabilize and create the floor of the tunnel. To enhance the tunnel's strength, additional steel is often incorporated for support, reducing the risk of cracking or damage. Once the floor sets, a waterproof coating is applied to effectively seal the tunnel, preventing water and moisture from infiltrating the structure. This waterproofing measure ensures the tunnel's durability and protects it from potential water-related issues.

An alternative form of interior lining is the sprayed concrete lining (SCL). It involves applying a reinforced concrete layer directly on-site through a spraying process. SCL is commonly utilized for tunnels constructed using the New Austrian Tunnelling Method (NATM) and can also be employed in construction pits when a quick and efficient lining solution is needed.

Establishing a robust foundation for the concrete expansion joints in tunnel structures is pivotal for their longevity and structural integrity. The process involves meticulous planning, beginning with the careful preparation of the installation area to ensure a clean and level surface. High-quality concrete is then poured to create a stable foundation, often reinforced with steel bars or mesh to bolster strength and prevent cracking. Equally essential is the application of effective foundation insulation to curb moisture ingress, reduce temperature variations, and enhance overall durability. This insulation plays a crucial role in safeguarding the expansion joint and the tunnel structure, preventing potential issues such as corrosion and structural damage. In essence, a well-executed foundation, coupled with proper insulation, is paramount for ensuring the reliability and longevity of tunnel structures while minimizing maintenance needs.

In every structure, including tunnels, the presence of drainage systems is crucial to manage excess water effectively. Proper drainage systems are essential to prevent water buildup and ensure the tunnel's integrity. It is of utmost importance to seal the area around the drainage system meticulously to avoid any leakage. By filling the gaps and using a suitable product with strong adhesion, the tunnel can be effectively protected, and the risk of leakage is effectively prevented.