Tunnel segments
Tunnel lining with prefabricated segments
The voussoirs are prefabricated elements of reinforced concrete which are assembled together to form a truncated cone ring inside the tunnel. This type of ring lining of voussoirs offers a robust and efficient solution for the construction of large diameter tunnels. Our technique employs prefabricated segments The high quality of the units, together with their watertight joints and the injection of mortar in the backside, ensure that each unit, together with its watertight joints and mortar injection in the backside, provides a definitive and resistant internal finish. During the drilling process with EPB (Earth Pressure Balance) type TBMsThe tunnel finish is optimized to ensure a solid and durable structure.
Advantages of segmental lining in tunnel construction
The use of voussoirs in the construction of tunnels allows the execution of curved layouts both in plan and in elevation, adapting to the specific needs of the project. The voussoirs are designed to withstand water tables and the pressures generated during TBM thrust, allowing the construction of long tunnel lengths without compromising structural integrity. The technique of tunnel construction by means of lining with segmental rings is ideal for projects that require high precision and flexibility in design, making the tunnels not only functional but also capable of integrating effectively into the subway environment.
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Frequently asked questions about tunnel lining with tunnel segments
What are voussoirs and how are they used in tunnel construction?
The voussoirs are prefabricated elements of reinforced concrete which are assembled to form a truncated cone ring that acts as a tunnel lining. They are placed in the tunnel by means of a EPB type TBM (Earth Pressure Balance), which pushes the segments as it moves forward, creating a solid and durable structure.
How do you ensure the quality of the segments and their watertight joints?
The quality of the segments is guaranteed by rigorous production controls and factory testing. In addition, during drilling, mortar is injected into the backside to ensure that the joints are watertight, preventing leaks and providing a definitive internal finish.
What are the advantages of ring lining in tunnel construction?
The ring lining of voussoirs allows the construction of tunnels with precision and flexibility, adapting to curves both in plan and in elevation. This technique is especially useful for large diameter tunnels and offers a solution that is resistant to water tables and ground pressures.
What types of tunnels can be built with precast segments?
The prefabricated segments are suitable for a wide range of tunnels, including subway tunnels, road tunnels and utility tunnels. Their use is especially advantageous in large-diameter tunnels and in projects requiring curved and precise linings.
How is the T.B.M. pushed on the segments?
The tunnel boring machine thrust is carried out on the segments by means of a system of thrust cylinders that transfer the force directly to the segments. This makes it possible to advance to great lengths and maintain the stability of the tunnel, adapting to curved layouts and ground conditions.
What type of TBMs are used for lining with voussoirs?
The lining with voussoirs is generally performed with EPB (Earth Pressure Balance) type TBMs. These tunnel boring machines are designed to work in soils with earth pressure and allow tunnels to be constructed with precision while continuously placing the segments.
