Splicing rigid joint device for waterproof joints of underground diaphragm wall

The utility model discloses an underground diaphragm wall joint waterproof splicable rigid joint device which comprises a plurality of joint sections which are sequentially connected end to end, the cross section of each joint section is in an inverted T shape, the top of each joint section is provided with at least two installation grooves which are distributed in a left-right parallel mode, and the installation grooves are arranged in the installation grooves. Each mounting groove is detachably connected with the middle part of a rubber waterstop; connecting plates are arranged at the front end and the rear end of each connector section, and connecting holes are formed in the connecting plates. According to the connector device, the two mounting grooves in the top of each connector section are detachably connected with the middle of one rubber waterstop, the two rubber waterstops can be transversely arranged between the two groove sections at intervals, the double-layer waterproof effect is achieved, the wa