Cable duct bank concrete pack expansion joint structure and construction method thereof

The invention discloses a cable duct bank concrete pack expansion joint structure and a construction method thereof. The structure comprises a concrete pack and a cable duct bank; concrete pack reinforcements are all broken at the expansion joint; a filling plate is arranged at the expansion joint; a hole is formed in the filling plate through which the cable duct bank can pass; each side of the filling plate is smaller than the concrete pack in size; a groove consisting of the concrete in the pack and the filling plate is plugged by sealing paste; a connecting reinforcement is arranged in the concrete pack; one end of the connecting reinforcement is bound and lapped with the concrete pack reinforcement, and the other end of the connecting reinforcement is a free end of an outer sleeve; the sleeve is plugged by a wooden plug at a non-connecting reinforcement stretching end. According to the device disclosed by the invention, a sleeve is sleeved at one end of each connecting reinforcement at the expansion joint, free stretching can be realized, the damage on the power and communication duct banks caused by the concrete deformation is effectively relieved, and good protection performance is realized.