A high-speed transportation system includes at least one transportation structure having at least one track, at least one capsule configured for travel through the at least one structure between a plurality of stations, a propulsion system adapted to propel the at least one capsule through the structure, and a levitation system adapted to levitate the capsule within the structure. At least one track is positioned to provide balancing force vectors to achieve stability for the capsule.

The present invention provides a foot frame bottom plate type fixed part, a sealed inner lining structure, an underground chamber, belonging to the field of compressed air energy storage technology. The skeleton includes a fixed bottom plate and an umbrella shaped tripod, which is equipped with a connecting part and an umbrella shaped part. The umbrella shaped part is set at the top of the connecting part. The umbrella shaped tripod is fixedly connected to the fixed bottom plate in the length direction, forming a semi open containment space clamp. The sealing inner lining structure includes an airtight layer and a foot rest bottom plate shaped fixed part. The underground chamber includes a concrete lining layer and a sealed lining structure. Its construction period is shorter than that of welded steel plates, and the cost is lower.