Grasping device for large-section U-shaped shield segment erector

The invention provides a grasping device for a large-section U-shaped shield segment erector. The grasping device comprises a grasping mechanism, a moving frame, a yoke beam and hoisting bolts, wherein the yoke beam is composed of a yoke beam rail and a steel structure and the moving frame is composed of a pin shaft A, a cylinder UZ, a cylinder RZ and the steel structure. The grasping device has the beneficial effects that three holes are formed in the lower side of a balance beam; two hoisting bolts can be grasped at the same time; mounting positions for the two hoisting bolts are prefabricated in the segments, so that the irregular shield segment erector can be used for grasping the segments heavier than 10 tons; compared with the traditional circular shield single-hoisting point mechanical grasping device, the grasping device provided by the invention has the advantages that the working capacity of the erector is increased, the reduction of the quantity of the segments and the increasing of the segment splicing efficiency are benefited and high quality and high efficiency of the whole tunnel lining are guaranteed.