Close-fit lining is a trenchless technology used to rehabilitate underground pipes and tunnels. It involves the installation of a precast concrete or steel plate lining within the existing pipe or tunnel, creating a strong, durable, and water-tight barrier.

One of the main advantages of close-fit lining is its ability to rehabilitate pipes and tunnels without excavation, which reduces the disruption to the surrounding environment and minimizes the cost of the rehabilitation project.

Close-fit lining is also a versatile solution that can be used for a range of pipe and tunnel diameters, shapes, and materials, including concrete, steel, and brick. This makes it a popular choice for a wide range of industries, including water and sewage, transportation, and oil and gas.

Another benefit of close-fit lining is its ability to increase the structural integrity of the pipe or tunnel. The lining is designed to fit tightly against the existing structure, creating a seamless and watertight barrier that can withstand external pressures and reduce the risk of leaks or cracks.

In addition to its structural benefits, close-fit lining can also improve the hydraulic performance of the pipeline or tunnel. The smooth surface of the lining can improve the flow of water or other fluids, reducing the risk of blockages and improving overall efficiency.

While close-fit lining has many benefits, it is not without limitations. For example, the technique may not be suitable for pipes or tunnels with significant deformities or structural damage. Additionally, the technique requires careful planning and installation to ensure that the lining is properly aligned and does not create any obstructions or blockages.

Overall, close-fit lining is a highly effective and popular solution for rehabilitating underground pipes and tunnels. Its ability to rehabilitate pipes without excavation, its versatility, and its ability to improve structural integrity and hydraulic performance make it a popular choice for a range of industries.

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