Construction device for improving grouting and edge locking efficiency of karst cave

The construction device comprises a base, a sliding groove, a connecting opening and a pressing head, the sliding groove is formed in the base, a thrust spring ring is arranged in the base, a fixing plate is installed in the base in a sliding mode, and a sliding block and the pressing head are fixedly installed on the fixing plate. According to the construction device for improving the karst cave grouting and edge locking efficiency, the supporting plates are arranged, the two supporting plates are pushed to be combined and then placed into a hole opened through a drill bit, the inner wall range of the hole limits the expansion range of the supporting plates, at the moment, thrust spring rings are in a contraction state, and after the two supporting plates reach the karst cave, the supporting plates are fixed; the thrust spring ring is not limited to push the pressing head to move outwards, the pressing head synchronously pushes the supporting plate to expand outwards through the fixing plate and the threaded