Special launching carrier with variable platform provides new method to effectively solve the problems of erecting bridges at tunnel portals and even in tunnel in mountain areas.
1. It is a combination of the lifting, transporting and launching the concrete box beam, it can also pass through the tunnel without any disassembly because of its small section size.
2. Solve the zero distance erection when there are only one span of bridge between tunnels.
3. Distribute always the wheels’ load on more than two separated span of decks.
4. Move all machine parts by itself to go through tunnel for changing new jobsite.
5. Main machine can achieve bi-directional erection.