if the distance separating the banks has been spanned the same process is used to bring the last girder 13 c fig8 into position above the launching means 18 and girders 13 b and 13 c are connected together the first girder is able to span distances of less than 9 m two girders are able to span distances of less than 17 m and three girders are able to span distances of less than 25 m the remote controlled implementation of the platform 1 is carried out using a control post 30 housed in a vehicle or technical shelter located at a distance behind the intervention site of the platform 1 this control post is thus protected and cannot be seen by any observers this post shown schematically in fig1 is composed of a steering control post 31 and a command post 32 post 31 incorporates a monitoring screen 33 for example a video screen the remote steering controls 34 for the platform to control movements backwards and forwards steering lock in one direction etc and an implementation monitor 35 for the bridge used to control the different control means for the deployment of said bridge this essentially requires the control of the cylinders in a known sequence in the bridge carrying vehicles post 32 is constituted of a video screen 36 on which the platform control data is displayed a cartography system 37 to guide the platform over the ground and an implementation monitor 38 for the bridge as explained above lastly the control post 30 incorporates means 39 to radio transmit data to the platform 1 in relation with its corresponding means implementation is as follows the platform 1 equipped with its bridge 13 and the control post.