The invention discloses a compaction groove screw for a Halfen channel, a support structure and a mounting method. The compaction groove screw comprises a groove-type nut and a bolt, wherein a row of rectangular grooves are formed in each of two transverse ends of the nut, a screw rod is tightly meshed with the lowest circle of a meshing thread of the nut, a clamping plate provided with a central hole is arranged outside the upper end of the screw rod in a sleeving manner, and a spring is mounted outside the screw rod and between the bolt head and the central hole of the clamping plate. The compaction groove screw is preassembled into a whole with pretightening force in a manufacture place for transportation. The support structure is an L-shaped porous butt strap which comprises a horizontal butt strap arranged on an
open surface of the Halfen channel and a vertical butt strap for support and is provided with a mounting hole, the upper part of the clamping plate of the compaction groove screw after mounting is arranged above the horizontal butt strap in a clamped manner, and the lower part is arranged in the Halfen channel and in inserted connection with teeth of the Halfen channel. During mounting, all that is needed is to perform manual pushing-in, downwards pressing, rotation, popping, tightly screwing and the like on the compaction groove screw to finish mounting, and axial position adjustment can be realized. Efficient, convenient and accurate mourning is realized, and examination, dismounting and replacement are convenient. Components do not move easily, operation is facilitated, the integrity is good, the safety is high, and the compaction groove screw and the support structure can be applied to railway tunnels, bridge supporting and fixing contact nets, communication signals,
electrical equipment and the like.