The invention relates to a tunnel
ditch insulation structure. In a traditional tunnel
drainage ditch, a double-layer cover plate insulation
ditch is commonly used, insulation materials are added in the middle of the double-layer cover plate insulation
ditch, the mode that angle steel is embedded on the side wall of the ditch and a cover plate is placed on the angle steel is used for mounting the second cover plate layer, construction difficulty is large, the cover plate can fall easily to plug the ditch for the reasons of breakages, size errors and the like, and water draining is not smooth. According to the tunnel ditch insulation structure, a reinforcing
steel bar support with a U-shaped cross section is arranged above a ditch in a tunnel, the bottom face of the reinforcing
steel bar support is higher than the water surface in the ditch, and the reinforcing
steel bar support is filled with insulation materials. The top edge of the reinforcing steel bar support is bent to the two sides in the horizontal direction and is placed in ditch wall surface
chisel grooves formed in the two sides of the top of the ditch,
cement mortar is used for flattening the ditch wall surface
chisel grooves, and a ditch cover plate covers the reinforcing steel bar support. The tunnel ditch insulation structure can achieve the insulation purpose of tunnel ditches in cold regions, and has the advantages of being simple in construction, convenient to replace, saving in investment and the like.