PURPOSE: To improve the execution property by arranging a formwork at the tip of the existing main girder concrete with a liftable and movable main beam, and repeating the placing work of concrete to extend a main girder in sequence.
CONSTITUTION: A main beam 6 is installed at the adjacent segment to the existing main girder concrete, and a formwork 4 is arranged via a formwork receiving beam 5. The angle of the beam 6 and the height of the formwork 4 are adjusted with an angle adjusting jack 15 and a formwork height adjusting jack 7. The beam 6 is fixed to the existing section with a fixing jack, the tip of a suspension member 3 is temporarily fixed to a suspension member temporarily fixing body 12, reinforcing bars are arranged on the formwork 4, and concrete is placed and hardened. The suspension member 3 is permanently fixed and fastened, then the beam 6 and the form 4 are lowered with a main lift jack 10. They are moved and lifted with an advancing jack 8 and the jack 10 and set in the adjacent segment to the existing section. The execution capability can be sharply improved, and the device can be made lightweight.
YAMAUCHI AKIO
ABE KAZUYUKI
WADA NOBUHIDE
KITAGUNI SHUICHI
TAKAHASHI ATSUSHI
