Railway tunnel center ditch cutting construction device and method

The invention relates to a railway tunnel center ditch cutting device and a construction method, and belongs to the technical field of railway tunnel center ditch excavation, and a chain-shaped cutting lock sequentially penetrates through a power device, a tensioning device, a guide wheel and a rotating wheel to form a ring. The chain-shaped cutting rigging is driven by the power device, the guide column extends downwards to the designed depth of the tunnel center ditch, and hard rock is deeply cut to the designed depth; the chain-shaped cutting rigging is placed at the bottom of the cutting seam at the end away from the free face, and the bottom is horizontally cut; and the cutting body is crushed, excavated and discarded by a machine. The method has the beneficial effects that the geometric dimension required by excavation of the central ditch can be more accurately controlled according to design requirements, the construction efficiency can be improved, and unnecessary waste is avoided. 本发明涉及一种铁路隧道中心水沟切割装置