The present invention relates to the disassembly and installation of the device the lower deck conduit; Its purpose by after installing the rollers on the bottom of the channel, which are installed on the bridge over the traction unit traction with the ground and can be safe construction worker, and the construction costs due to reduction of construction time to work without distinction on climate It is the dismantling and installation apparatus of the deck lower pipeline that can be performed to provide.; The invented for achieving the above object, giving lifted upwardly to separate from the shift 11 and the piers 12, the upper yuapjaek 30 installed in the channel 40, the girder 13 to the said elevated conduit ( 40) is a slide, and install the roller (20a) on top of the abutment 11 and the piers 12 to be towed to the outside of the bridge 10, the duct 40 is down in the dumps not to touch the girder 30 by installing a screw type jack 31 to the girder 30 sikidoe raising the pipeline 40, to attach the roller (20a) to an upper portion of the screw type jack 31 and so that the pipe 40 slides, the bridge that by using the traction device 50 on the outer side of the 10 made by pulling the pipe 40 to the outside of the bridge 10 and to the technical aspect.
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