Telescopic strut capable of preventing U-shaped steel from deforming

A telescopic strut capable of preventing U-shaped steel from deforming belongs to the technical field of underground equipment for a coal mine, and relates to a telescopic support device that is used for preventing U-shaped steel from deforming and is used underground in the coal mine. The telescopic strut comprises the technical scheme as follows: the telescopic strut comprises U-shaped steel cross beams, U-shaped steel clips, Pi-shaped beams and individual hydraulic props, wherein every two U-shaped steel cross beams are connected to form a telescopic cross beam, the two ends of which are fixed at the upper parts of the two ends of each Pi-shaped beam; in addition, the top ends of the individual hydraulic props are fixed at the bottoms of grooves formed in the two ends of the Pi-shaped beams, and the bases of the individual hydraulic props are fixed on a laneway bottom plate. The telescopic strut has the advantages as follows: the telescopic strut is used as a deformation-resisting auxiliary device for the