Bill of Quantities, general layout, general layout, reinforcement drawing of main channel, general structural drawing of interface section, reinforcement layout drawing of interface section, general structural drawing of management room, reinforcement structural drawing of management room, reinforcement structural drawing of open section stairway, reinforcement structural drawing of closed section stairway, structural drawing of underpass sink joint and waterproof, structural drawing of underpass drainage channel, structural drawing of handrail, reinforcement drawing of stairway Sealing plate structure