The gantry crane of the subway slag turning hook is used to lift the muck in the tunnel to the ground during the subway construction. The gantry crane for muck removal in subway construction is a special crane developed in combination with the general gantry crane, especially for overturning and dumping mud and lifting segments during subway construction.

The crane is composed of a gantry, a small car (equipped with a lifting mechanism, a small car running mechanism, and a hydraulic flipping mechanism), a large car running mechanism, a driver's cab, and electrical equipment. According to the different directions of soil pouring, the support leg structure can be divided into two types: A-type and U-type. The crane operating mechanism adopts an 8-wheel 4-wheel drive form and is equipped with a windproof rail clamp. When the crane is working normally, the clamp of the rail clamp leaves the track.

The lifting mechanism adopts a hanging beam as the lifting tool, and there is a freely rotating hook in the middle of the hanging beam, which is used for lifting pipe segments and other materials. The car is equipped with a hydraulic flipping mechanism, which is composed of a hydraulic workstation and a slag flipping hook. Before lifting the slag bucket with the hanging beam, the driver controls the action of the hydraulic overturning mechanism. The hydraulic cylinder pushes the slag hook back to a specific position, and then the slag bucket rises above the slag hook. The driver controls the slag hook to move forward to the bottom of the slag bucket, and the slag bucket descends. The eccentric overturning shafts on both sides fall on the slag hook and continue to descend. The slag bucket starts to overturn using its own weight eccentricity, thereby completing the dumping work.

In order to meet the characteristics of short construction period and frequent replacement of construction sites in subway construction, our company has specifically added a variable span function on the main beam to facilitate the span change after the replacement of construction sites. For example, continuous spans between 20 and 27 meters.