Unique design
hydraulivc 3-point equilibrium way.

1. Provide multiple protections to secure" hydraulivc 3-point equilibrium way' so as to ensure stable, reliable and mobile 3-point floating status of precast girder.

2. The big diameter of two oil jack communcating tubes on the flexible support carrier to increase velocity of oil flow through 2 oil jack so as to overcome the unfavourable case that it may take longer time in responding to ' Hydraulic 3 point equilibrium way' self-floating adjustment than to " mechanical 3-point equilibrium way'.