In the Financial Avenue section (west extension), the original design specified steel pipe supports with a horizontal spacing of 4 meters and a vertical spacing of 3 meters, which provided too limited excavation space for large machinery and affected earthwork excavation efficiency to some extent. The original steel supports in the west extension section were expected to total about 2,823 tons, while the use of prestressed assembled steel supports can save nearly 312 tons of steel material. Compared with traditional concrete supports, this creates multiple large spaces of approximately 19 meters × 20 meters, accommodating several excavators for simultaneous transfer and excavation operations, greatly improving earthwork excavation efficiency.