Quick Repair Method for Water Leakage Deep in Asphalt Concrete Core Wall of Earth-rock Dam

Abstract

The invention relates to a quick repairing method for water leakage in a deep position of a bituminous concrete core wall of an earth and rockfill dam. A plurality of holes are drilled in the bituminous concrete core wall, the edges of the holes are mutually connected to form a first I-stage deep groove which is 4-6 m long along the axis of the core wall, and bituminous mortar is poured upwards from the bottom of the first I-stage deep groove; meanwhile, a plurality of holes are drilled in the position, 3-4 m away from the first I-stage deep groove, of the bituminous concrete core wall, the edges of the holes are mutually connected to form a second I-stage deep groove which is 4-6 m long, and bituminous mortar is poured; 10-15 hours later after the bituminous mortar is poured in the first I-stage deep groove and the second I-stage deep groove, a plurality of holes are drilled in the position, between the first I-stage deep groove and the second I-stage deep groove, of the bituminous concrete core wall, the edges of the holes are mutually connected to form a first II-stage deep groove which is 3-4 m long, at the two ends of the first II-stage deep groove, the poured bituminous mortar is cut by 40-50 mm correspondingly, and bituminous mortar is poured; and operation is circulated until all leakage points on the axis of the core wall are covered by the groove section where the bituminous mortar is poured. The quick repairing method is simple and reliable and can guarantee the waterproof effect of the concrete core wall.

Description

Technical field: [0001] The invention relates to a rapid repair method for water leakage in the deep part of the roll-compacted or poured asphalt concrete anti-seepage core wall used in earth-rock dams and tailings dams in water conservancy and hydropower projects. Background technique: [0002] The rolling and pouring asphalt concrete anti-seepage core wall structure of the earth-rock dam has the advantages of small engineering volume, fast construction speed, and no interference to the dam construction; the rolling and pouring asphalt concrete is used as the anti-seepage in the design of the earth-rock dam The core wall material has become the development direction, and at the same time, the asphalt concrete core wall earth-rock dam project has achieved greater development in the water conservancy and hydropower industries. In our country, the application of roller compacted asphalt concrete as the anti-seepage core wall in earth-rock dams is short, and the technology of c...

AI Technical Summary

Problems solved by technology

In our country, the application of roller compacted asphalt concrete as the anti-seepage core wall in earth-rock dams is short, and the technology of construction units is uneven, while the roller compacted or poured asphalt concrete core wall is constructed layer by layer. Even every 1 meter of poor interlayer bonding will cause water leakage; especially for cast asphalt concrete core walls, due to the separation of aggregates or insufficient vibration, water leakage is very easy to occur; asphalt concrete core walls will inevitably have interlayer water leakage In some dams, the asphalt concrete core wall leakage phenomenon was discovered when the project had been completed, and such incidents had already occurred in the built dams; after the completion of the dam, it was not only very difficult to excavate the asphalt concrete core wall, but also had to be excavated at the same time. After the dam shell material is rebuilt, the repair cost is very high and time-consuming; the current solution is to make a cement concrete cut-off wall in the dam shell material, which has a long construction period, high cost and low reliability

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