Box jacking - Opema

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Box jacking

Box jacking without cutting rail traffic

The need to cross under a circulation route, mainly a railway, has posed problems inherent to circulation from the beginning, which over time have been resolved according to technical development and the possibility of using adequate machinery.

The impossibility of suppressing the traffic during the execution of the work for the underpass is a fundamental premise, and from there all the solutions have started.

The execution of an underpass by hydraulic thrust, consists of the construction of the masonry in the vicinity of the final location and subsequent translation by hydraulic thrust across the track, to its final position, so as to minimize the impact to the tracks and therefore to the railway traffic. For this, the work is located and built nearby, on a concrete platform (slip screed) and once the required resistance has been achieved, the thrust is carried out using hydraulic cylinders that transmit the efforts to a reaction wall and to the ground itself. At the same time, the land is emptied so that the stability of the railway is not endangered. Prior to the push and to maintain the circulation of the trains, the shoring of the railway or railway is placed.