Based on the site selection, tunnels are divided into mountain tunnels, submerged tunnels, and urban tunnels. Due to the particularity of the location, its survey and excavation must be based on the surrounding topography, geology and underwater distribution. In order to ensure smooth traffic capacity, the tunnel should be strengthened and supported in advance.
When the tunnel is built in the terrain or the surrounding of broken rock, loose soil layer and difficult to drill, self drilling anchor bolt can put drilling, grouting and anchor together without casing pipe and drilling pipe, which solves the problem of low drilling rate of traditional anchoring methods, and then ensure the anchoring effort in the complicated geological condition. It owns the features of convenience, reliability and high- efficiency.
When the tunnel is built under the influence of the chemical medium in seawater, it is difficult for ordinary bolts to be preserved for a long time, which will affect the quality of the project. The double coating rock bolt adopts hot dip galvanizing and epoxy coating technology to separate water, oxygen, chlorides and other corrosive media to achieve a good anti-corrosion effect and provide permanent support for the tunnel.