The additional drainage blind ditch is used to rectify the leakage of the tunnel arch and the drainage of the blind ditch and sedimentation tank. Determine the side of the blind ditch with the vault as the center line, so that the blind ditch is located on the side where the water leakage is concentrated. The specific method is as follows: firstly use the boring cutter and the wind shovel to cut the dovetail type drainage groove with the outer mouth width 10cm, the inner mouth width 15cm and the depth 10cm in the tunnel lining; the construction of the side wall below 2.5 meters is done well. Under the premise of safety protection measures, construction is carried out by train interval; the construction of the arch part is carried out by using the power supply lifting rail car in the blockage point of the power supply “skylightâ€. For example, the unsupported lifting rail car can be used to construct the arch working platform on the track flatbed trailer. Use a wind drill (rock drill) to circulate a Φ28mm water collecting hole with a rock drill at a distance of 0.5 m in the middle of the dovetail groove. The hole depth is about 0.5-1.0 m, perpendicular to the drainage trough; then clean the tank with a wire brush and a high-pressure water gun. Φ100mm semi-circular plastic drain pipe is fastened. The drain pipe is fixed with steel shrapnel and expansion bolts every 1 meter. The semi-circular plastic drain pipe is made of PPR water pipe with inner diameter of 85mm; then C20 fine stone concrete is filled in the tank. And flush with the existing lining surface. The newly added dark pipe is connected to the existing side ditch. For example, on the side away from the side ditch, a sedimentation tank is formed at the bottom of the side wall, and the water accumulated in the sedimentation tank is introduced into the existing side ditch by the Φ85mm PPR water supply pipe.
The additional water diversion holes are used to rectify the water leakage in the vault, and the water leakage in the large area of ​​the side wall is improved by adding water diversion holes to reduce the water level outside the lining. First, a row of Φ35mm water diversion holes is added to the side wall below 2 meters of the arch line with a rock drill at intervals of 0.25 m. The hole depth is about 0.5-1.0 m, perpendicular to the side wall. The angle between the water diversion hole and the horizontal plane is 5-10 degrees, and the bottom is high and low. If the amount of dripping water is still large, a row of water diversion holes can be added, which is wrong with the upper row of water diversion holes, and the vertical distance is 0.4 m.
Sealing cracks and water leakage eyes are leaking and dripping water at the cracks in the vault, and the water drops are scattered. In the case where the water leakage is not significantly reduced after the water diversion holes are added, the leakage is taken. Before the plugging, the drainage blind ditch should be added first. Because sealing the water leakage will raise the groundwater level outside the surrounding rock, it will affect the stability of the surrounding rock and lining, and it will often create new water leakage eyes in other sections after plugging, so the drainage should be added before plugging. Blind ditch, draw out groundwater in the surrounding rock, and then seal the leaking eye and the vault crack. The specific method is as follows: firstly, use a wind chisel to cut a cubic slot with a side length of about 5 cm, and then clean the tank with a wire brush and a high-pressure water gun; take appropriate amount of water to mix with water, such as lower temperature. Mix with warm water, mix the amount of material for each time; mix the standing water into a putty shape and fill it into the tank after it is heated, and block it with both hands for about 3-5 minutes until standing. The water is hardened; the lining leakage crack is blocked. First, a rectangular groove with a width of about 5 cm and a depth of 5 cm is cut by a wind crevice along the water leakage crack, and then sealed with standing water. The construction shall be carried out by using the power supply lifting rail car (work platform truck) in the power supply "sunroof" blockade point.
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