3 The operation effect after the transformation is more than one year's operation, and the mud discharge effect is ideal. The thickness of the mud at the bottom of the inclined tube sedimentation tank is below 15cm, and the mud accumulation at both ends disappears. It turns out that the drainage of the sedimentation tanks is reduced to 1~2 times per year. The turbidity of the precipitated water before filtration decreased significantly, averaging below 10 NTU, which was in line with the sedimentation water standard of the National Type II Water Division. The filter is restored to the design state, and the washing time is also shortened by 1~2min. This only reduces the water consumption of the washing pool by 56.31X1 per year (fm3. The application of technical AC drilling grouting technology in the underground drainage pipe plugging and strengthening is located The underground drainage pipe of the main street of Huaihai Farms Department in Sheyang County, Jiangsu Province was originally constructed by pipe jacking. The length of each pipe is 1.5m, and the interface is treated with rubber band and asphalt oil immersion. The main cause of road collapse is investigated. The reason is that the pipeline interface is misplaced and cannot be corrected to the specification requirements. The interface material is aging, the water leaks and the mud is accumulated, and the pipe is accumulated in 2/3 tubes. The drainage pipe has been connected with the ground to form a good water inlet channel. During heavy rain, the road surface water collects into the subsidence and penetrates into the ground at a relatively rapid speed, which accelerates the expansion of the ground subsidence range. The process of plugging and reinforced the underground drainage pipe: drilling (with construction conditions on site), grouting (filling and strengthening), pumping, dredging, repairing and plugging (the nozzle needs to be roughed and rinsed) Design requirements are elevated). Construction operation requirements: Check the pipeline position, and the distance between the double-row holes of 1.0m cloth from the pipe is 1.0m. The drilling depth. According to the pipeline data, the hole depth is required to reach 0. 5m at the bottom of the pipe. The hole is drilled with a 150 type rotary drilling machine, the mud wall is drilled, the opening diameter is 120mm, and the diameter of the hole is 89mm. Grouting. The pressure is grouted by sectioning (first down and then 1m is a section), the pressure is controlled at about 294 kPa, and the amount of pulp is not controlled. Slurry ratio. The mixing ratio of 425 cement, fly ash and clay is: cement: fly ash: clay = 0.4:0.3:0.3, the volumetric quality of the slurry is controlled at 1.4~1.6g/cm3, and the thick slurry is used as much as possible. Grouting quality inspection and final hole standards. a. Check the position of the hole and whether the hole depth meets the design requirements; The amount of grouting shall not be subject to the following; The final pore pressure is above 294 kPa. Subsequent dredging and repairing of the pipeline after the final hole. Dredging: Require thorough and rinse with tap water. Repair: remove the grouting and infiltrate the mixed slurry in the pipe joint, the interface is roughed and grooved, and rinsed cleanly. The asphalt oil-impregnated cotton wire is forcibly inserted into the seam, and the 6mm diameter steel mesh is added, and the C30 fine concrete is poured and finally finished. A layer of waterproof mortar. It has been nearly two years since the construction, the road has been restored to a smooth, not sinking, and only a part of the pipe interface is sweating and seeping, but it does not leak mud. It can be seen that the use of borehole grouting to treat road collapse caused by deep buried pipe leakage is one of the effective methods (Zhang Wenyuan, Liu Huaguo, Huaihai Farm, Sheyang County, Jiangsu Province)
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