Method for removal of temporary support system for road bridge pre-fabricated small box girder-type concealed bent cap, and equipment therefor

A method for removal of a temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, the method comprising following steps:

• (1) removing cantilever beams:
• first lifting the cantilever beams with a truck crane, then removing connections between the cantilever beams and a main beam, and finally lifting the cantilever beams with the truck crane to a flatbed truck for removal;
• (2) removing a lateral pier support system and loading same onto a truck:
• near two ends of an outer-side main beam section in a length extension direction, lifting a side close to the lateral pier support system by using a first hoisting equipment, hoisting a side close to a main pier support system by using a second hoisting equipment, and then removing connections between the outer-side main beam section and a lateral pier vertical support, so that the lateral pier vertical support can be hoisted onto a flatbed truck by using a truck crane;
• (3) removing the outer-side main beam section connected to the lateral pier support system and loading same onto a truck:
• after the lateral pier vertical support is removed and a connection between the outer-side main beam section and a main beam middle section is removed, simultaneously starting the first hoisting equipment and the second hoisting equipment used in step (2), lowering the outer-side main beam section to the ground, then pulling the outer-side main beam section outside a projection area of a pre-fabricated small box girder by using a truck crane, and hoisting the outer-side main beam section onto a flatbed truck;
• (4) removing, horizontally displacing, and lowering the main beam middle section connected to the main pier support system:
• after the main beam middle section is lifted by using a movable hoisting equipment, removing a link between the main beam middle section and a main truss system, then starting a horizontal-displacement apparatus of the movable hoisting equipment, transporting a main beam section a near a midspan, then starting a lifting mechanism of the movable hoisting equipment, and lowering the main beam middle section onto a flatbed truck;
• (5) hoisting, lowering, and laying flat the main truss system and loading same onto a truck:
• starting the horizontal-displacement apparatus of the movable hoisting equipment, and enabling the movable hoisting equipment to reset;
• and hoisting the main truss system, and then removing a constraint between the main truss system and a main pier vertical support;
• starting the horizontal-displacement apparatus, transporting the main truss system near the midspan, and finally lowering and laying flat the main truss system by using the lifting mechanism of the movable hoisting equipment;
• replacing a connecting position between the lifting mechanism in the movable hoisting equipment and the main truss system, until the movable hoisting equipment can move the main truss system in a lying state to a flatbed truck;
• and
• (6) removing the main pier vertical support system and a pad beam:
• starting the horizontal-displacement apparatus, restoring the movable hoisting equipment at a section of the pre-fabricated small box girder above the original support, hoisting the main pier vertical support system, and then removing a link between the main pier vertical support system and the pad beam;
• and then starting the horizontal-displacement apparatus to move the main pier vertical support system near the midspan, and finally starting an electric hoist to move the main pier vertical support system to a flatbed truck.