Repair technology for drainage pressure reducing well

Abstract

The invention provides a repair technology for a drainage pressure reducing well. The repair technology includes the steps that first, cleaning is conducted in an original well; second, inserting tube tools are prepared, the inserting tube tools comprise a filter tube and steel retaining devices, the length of the filter tube is 0.5-1 meter larger than the length of a filter tube of a well tube of the original pressure reducing well, filter holes are evenly distributed in the outer wall of the fiber tube, the outer wall of the filter tube is coated with a filter net, a tube plug is arranged at the bottom end of the filter tube, the top end of the filter tube and the bottom end of a water rising tube are connected to form an inserting tube with the length being larger than the depth of the original pressure reducing well, the steel retaining devices are round pieces with inserting holes formed in the middles, and the diameter of the outer edge of each steel retaining device is equal to the inner diameter of the well tube of the original pressure reducing well; third, the inserting tube tools are inserted into the well tube of the original pressure reducing well in a downward mode, and the filling space of at least 80 mm is reserved between the inserting tube tools and the well tube of the original pressure reducing well; fourth, fifth, sixth and seventh, filter materials are evenly backfilled to the filter tube along the filling space so that the filter tube is full of the filter materials, coarse sand is backfilled to the position 1-1.2 meters higher than the bottom of the water rising tube, clay is backfilled to the position 2-2.2 meters lower than the top of the water rising tube, and concrete is backfilled to the position on the top of the water rising tube; eighth, a wellhead is manufactured. The pressure reducing well repaired through the method has an original drainage function, the phenomenon that a waste well is subjected to landfill treatment and is shifted again to build the pressure reducing well is avoided, and the project cost is lowered.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a relief well for maintaining embankments or dams. Background technique [0002] The relief well is a commonly used and effective protection and reinforcement facility for river dams. Its main function is to dredge the underground seepage in the dam during the flood season. The pressurized water head and osmotic pressure of the embankment prevent the seepage deformation and seepage damage of the embankment, and protect the safety of the embankment. [0003] Existing relief well structures such as figure 1 As shown, the upper section of the well pipe in the relief well is the well pipe 1 of the relief well, and the bottom section is the filter pipe 2, and the filter pipe 2 is provided with a strip-shaped water filter hole 20. The maximum diameter of the relief well with this structure is The problem is that the strip-shaped water filter holes 20 make the fi...

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Problems solved by technology

[0003] Existing relief well structures such as figure 1 As shown, the upper section of the well pipe in the relief well is the well pipe 1 of the relief well, and the bottom section is the filter pipe 2, and the filter pipe 2 is provided with a strip-shaped water filter hole 20. The maximum diameter of the relief well with this structure is The problem is that the strip-shaped water filter holes 20 make the filter tube 2 form a strip-shaped skeleton, and as the running time prolongs, the strip-shaped skeleton of the filter tube 2 will age, and the side pressure generated by the filtered water layer of the filter tube 2 will The framework of the filter pipe 2 is broken due to extrusion, which causes a large amount of sand to be continuously poured into it, making it unable to be used normally and resulting in failure. The failed relief well can only be scrapped, or the relief well can be rebuilt nearby.

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