Procedure for the production of cross-sections under railway lines

摘要

Method for constructing a transverse passage (6) under a railway or a roadway (1) supported by an embankment (5), using two hollow frames (11, 12) fitted against one another according to the self-insertion method, in which the two frames are mutually and progressively brought together using traction cables (14, 15) which are attached to these frames and drawn by jacks (rams) (16, 17) carried on the latter. According to the invention, this method is characterised in that it consists in progressively positioning tubes (23) or rigid metal sections which constitute a horizontal roof (9) forming a support base under the traffic lane, at the same time as the two frames are brought together, so that these tubes or sections are continuously supported and held to the upper face (22) of the frames and advanced through the ground (4) simultaneously with them as they are brought together until they enter into contact, substantially in the median plane (35) of the embankment, the tubes or sections being arranged so as to be able to undergo a relative displacement in their length direction with respect to the frames which support them as these frames are moved. IMAGE