Cable bridge three-way underframe

The utility model discloses a cable bridge three-way underframe which comprises two longitudinal port and a transverse port. Inclined connecting sides are arranged between the longitudinal ports and the transverse port. The cable bridge three-way underframe is characterized in that the transverse port is composed of a fixed first side plate and a movable second side plate, a connecting rod is arranged between the first side plate and the second side plate, one end of the connecting rod is fixed on the first side plate, at least one sliding groove is formed in one end, close to the second side plate, of the connecting rod, the second side plate is provided with a folding portion fitted with the connecting rod, a screw is arranged in each sliding groove, nuts are arranged above the folding portion, the screws penetrate the connecting rod and the folding portion and then are locked by the nuts, and a stretchable side sealing strip is arranged between the second side plate and the inclined connecting side adjacent to the same. By the cable bridge three-way underframe, size of a bridge needing to be connected can be changed according to on-site actual conditions, so that convenience is brought to subsequent modification, and the cable bridge three-way underframe is more flexible and convenient to use.