1. Crane girder erection: When using truck crane or crawler crane to hoist beams, members can be directly hoisted within the effective radius of the boom according to their own conditions, but this method cannot be adopted when the clearance under the bridge is insufficient or the hoisting tonnage is insufficient.

2. Girder erection with herringbone mast (fish hanging method): Girder erection with herringbone mast is simple and feasible, and it is used for girder erection of small and medium-sized bridges. The mast is made of steel and wood and can be tied on site.

3. Steel guide beam erection: The biggest advantage of steel guide beam erection is that it can be applied to precast beams of various spans and forms, and the equipment is simple, the materials are easily available, and it is not affected by river water. The guide beam must have sufficient rigidity and stability, and can meet the lifting requirements.

Extended data:

Precautions:

1, when lifting heavy objects, the hook wire rope should be kept vertical, and it is not allowed to drag the objects obliquely.

2, hanging heavy objects should find the center of gravity, and fastened. The application with acute angle should be padded with wood.

3, in front of the heavy lifting off the ground, the crane shall not do rotary motion.

4. When lifting or lowering heavy objects, the speed should be even and steady, so as to avoid the sudden change of speed and make the heavy objects swing in the air, causing danger. Don't drop heavy objects too fast, so as not to break them when landing.

5, crane in the case of lifting, try to avoid the boom. When the boom must be lifted under the lifting load, the lifting weight shall not exceed 50% of the specified weight.

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