Incredible Engineering: The Secrets of Switzerland's Tunnel Boring Machine
Exploring the process of tunnel construction in Switzerland using a tunnel boring machine. Learn about segment construction, concrete pouring, and ventilation.
00:00:14 A look at the equipment used for tunnel construction, including the tunnel boring machine. The machine breaks rock fragments and pushes forward along the tunnel.
π The equipment used for working in the tunnel is fascinating, including the tunnel boring machine and the cutter heads on the cutting wheel.
βοΈ The tunnel boring machine optimizes the arrangement of its bits based on the geology of the area, and stabilizing material can be placed in the rock behind the cutting wheel.
π§ The machine pushes forward along the already built tunnel, filling the gap between the tunnel and rock with a fast curing mortar.
00:01:57 Discover how a tunnel boring machine works as it builds a tunnel using segment construction and high strength concrete. Drilling and de-dusting are essential in this process.
π οΈ Tunnel boring machines (TBMs) use segments to build tunnel rings and secure the excavation.
β±οΈ Experienced teams can build a complete segment ring in about 25 minutes.
π§ High strength steel fiber concrete is used for the segment rings, making them rigid and allowing for different curves in the tunnel.
00:03:37 Explore the workings of the biggest tunnel boring machine in Switzerland. Learn about the construction process and the waterproofing techniques used.
π The tunnel boring machine continuously extends and suspends a belt from the tunnel vault for protection.
π§ The tunnel is made waterproof by installing a weather and pressure resistant membrane.
ποΈ Concrete work is carried out using movable formwork and a mobile concrete plant on-site.
00:05:20 This video explains the process of tunnel boring machine work in Switzerland. It covers various stages of construction and ventilation in the tunnel.
ποΈ The process of constructing a tunnel involves building a bridge for the tunnel boring machine to pass over.
βοΈ After the bridge is constructed, the tunnel floor and vault are completed using excavation material and strengthening techniques.
π¬οΈ Tunnel ventilation is achieved through a service gallery and ventilating air conduits suspended on the vault.
00:07:01 This video showcases the installation process of reinforcing cages and concreting of a tunnel using a tunnel boring machine. The formwork plays a crucial role in ensuring the structural integrity of the tunnel.
π§ The tunnel is prepared for the installation of the inner vault and reinforced with prefabricated cages.
π¨ The arched framework is assembled and the formwork is filled with concrete.
ποΈ The formwork is adjusted precisely and the concrete is poured into the tunnel.
00:08:43 A video about the construction process of a tunnel using a tunnel boring machine, showcasing the careful concreting and coordination of special equipment.
π The tunnel boring machine allows for a concreting stage every 24 hours.
βοΈ The concrete is supported by solid formwork tables until complete curing occurs.
ποΈ Marti Technic has planned and built all the equipment for the tunnel construction.
00:10:24 Learn how a tunnel boring machine works in Switzerland, where Marty's special devices enable the construction of a replacement tunnel in challenging geology.
π The tunnel boring machine is constructed in a factory and then delivered to the construction site.
β»οΈ Usable excavation material is stored and used for backfilling, while unusable material is transported elsewhere.
π§ The renovation of the original tunnel tubes will begin in 2021, relying on special devices for building a solid replacement tunnel.
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