A connecting device for a U-shaped steel bracket belongs to the technical field of
coal mine tunnel supporting. The connecting device comprises a top cover, a base and a W-shaped elastic strip
fastener, wherein the top cover is corresponding to an outer lapping side arc-
shaped beam, the base corresponds to an inner lapping side arc-
shaped beam, the top end of the W-shaped elastic strip
fastener corresponds to the base, the
tail end of the W-shaped elastic strip
fastener corresponds to the top cover, and the W-shaped elastic strip fastener is fixed on the top cover through a bolt. Two slopes are arranged on the base and are symmetrically arranged, and a limiting hole is formed in the
tail end of each slope; the end parts of two supporting arms of the W-shaped elastic strip fastener are set to be of hook-shaped structures which correspond to the limiting holes. According to the invention, the traditional clamp cable connecting method is abandoned, the W-shaped elastic strip fastener is adopted as a limiting member and composure control is realized through the W-shaped elastic strip fastener, when compact
ground pressure is encountered, the movement of two sets of connecting devices along with the respective arc-shaped beams fixedly connected with the two sets of connecting devices is realized in the mutual
diastrophism process of the two adjacent arc-shaped beams, and the failure of connection at the connecting part of the two adjacent arc-shaped beams is avoided, so that the stability of connection is guaranteed.