What are the most common diseases of arch bridges? What construction methods are usually used for erection?

Arch bridge, here is a concrete arch bridge.

According to the main arch ring forming method, it is divided into:

1, cast-in-place method is the basic construction process of completing the concrete of the main arch ring directly at the bridge hole. According to the equipment used, it can be divided into frame construction method and cantilever casting method.

2. Precast installation method is to divide the concrete main arch ring into several sections, which are now prefabricated in the ground or off-site factory, then transported to the bottom of the bridge hole, hoisted in place with hoisting equipment, spliced and gradually lengthened until it becomes an arch. There are mainly two kinds of equipment, cable hoisting equipment and outrigger crane.

3. Swing construction method: The main arch ring is separated from the vault, and the concrete pouring operation at high altitude of the main arch ring is changed to be carried out under the bridge hole or on both sides, and the swivel device is preset first. After the concrete main arch ring reaches the design strength, it will be rotated into an arch in situ. According to the geometric plane of rotation, it can be divided into plane rotation structure and vertical rotation structure.