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Explore Rolling the Arch: How a Crew Pushes a Tunnel Trolley Along the Rails with 41,394 views, 84 likes, and 0 comments. Experience the impact of this video content that has captured audience attention.

**Arch and Rail: The Mechanics of a Tunnel Trolley** A tunnel trolley—also called a mobile formwork or a tunneling shield—is a large steel arch that moves on rails. It is used to support the tunnel’s walls and roof while concrete is poured and cured. The trolley is built in sections, and its wheels ride on steel rails laid on the tunnel floor. The workers push the trolley forward by hand, using the rails as a guide. The structure is heavy—several tons—but the rails and wheels reduce friction, and the workers’ coordinated push moves it inch by inch. - **Trolley Type**: A steel arch formwork, with a curved roof and vertical sides. - **Weight**: The trolley weighs 5 to 20 tons, depending on the tunnel size. - **Wheels**: Steel wheels, 6 to 12 inches in diameter, running on steel rails. - **Rails**: The rails are laid on the tunnel floor, parallel and level. - **Push Force**: Three to five workers can push the trolley at 1 to 2 feet per minute. - **Coordination**: One worker calls the count, and the others push together. - **Safety**: Workers wear hard hats, gloves, and boots; the trolley can roll back if not chocked. - **Post-Push**: The trolley is locked in place with chocks and jacks before concrete is poured. When the trolley reaches its position, the workers chock the wheels and begin the concrete pour. The arch holds the form while the concrete sets. This is not a task that will appear in a construction manual; it is the heavy, coordinated work of a tunnel crew. And as the sun sets over the site, the workers know that the tunnel they are building will carry roads, water, or trains—thanks to an arch, a rail, and a team of steady hands.

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