A system for repairing pre-embedded asphalt cracks in asphalt concrete core wall dams

Abstract

This utility model discloses a system for repairing pre-embedded asphalt cracks in asphalt concrete core wall dams. The system includes an asphalt concrete core wall, with steel pipes embedded within it. A heating device is positioned in the center of the steel pipes, which are filled with asphalt material. The heating device is encased in the asphalt material and connected to a power cable. The power cable is covered with a high-temperature resistant insulation layer and is connected to a power source at the dam crest. This solution demonstrates significant crack repair effectiveness, reliable and safe operation, and convenient construction. It effectively addresses the difficulty in repairing cracks in asphalt concrete core walls and shows promising application prospects.

Description

Technical Field

[0001] This utility model relates to the repair technology of seepage prevention structure of earth-rock dams in water conservancy and hydropower projects, and is applicable to the repair of cracks in the asphalt core wall of asphalt concrete core wall dams in reservoirs. Specifically, it relates to a repair system for pre-embedded cracks in the seepage prevention structure of asphalt concrete core wall dams. Background Technology

[0002] Asphalt concrete core wall dams are a type of earth-rock dam with asphalt concrete as the seepage-proof core wall. Compared with conventional earth-rock dams with soil core walls, asphalt concrete core wall dams have advantages such as good seepage prevention performance, less impact of climate on construction, strong erosion resistance, and no hydraulic splitting failure. They are widely used in areas where suitable seepage-proof soil materials are lacking or where it is difficult to construct with soil materials in cold or frigid conditions.

[0003] Asphalt concrete core walls are characterized by their thinness and height. However, the wall not only deforms downstream under reservoir water pressure but also undergoes vertical deformation due to the additional vertical loads from dam settlement. Asphalt concrete is a viscoelastic material, making it difficult to determine its physical and mechanical parameters, and thus difficult to accurately calculate the stress-strain state of the core wall; leak detection and repair / reinforcement are also challenging. Asphalt concrete core wall dams are prone to developing microcracks due to aging of the asphalt material, temperature stress, dam deformation, or foundation deformation. Traditional repair methods require drilling and grouting or excavation and filling, which have the following drawbacks: drilling damages the integrity of the core wall and may cause secondary leakage; excavation and repair work is extensive and affects the normal operation of the dam; and the repair material has poor integration with the original core wall, easily forming a weak interface. Utility Model Content

[0004] To reduce the impact on the dam when repairing cracks in the asphalt concrete core wall and to solve the problem of poor integration between traditional repair materials and the original core wall, this utility model patent aims to provide a pre-embedded asphalt crack repair system for asphalt concrete core wall dams that can be pre-embedded, excavated-free, and reusable, so as to achieve crack repair and long-term seepage prevention.

[0005] The present invention adopts the following technical solution:

[0006] An asphalt concrete core wall dam seepage prevention asphalt pre-embedded crack repair system includes an asphalt concrete core wall, a steel perforated pipe pre-embedded in the asphalt concrete core wall, a heating device arranged in the center of the steel perforated pipe, the steel perforated pipe filled with asphalt material, the heating device wrapped with asphalt material, the heating device connected to a power supply cable, the power supply cable covered with a high temperature resistant insulation layer, and the power supply cable connected to a power source at the top of the dam.

[0007] Preferably, the steel pipe includes a vertical pipe and a horizontal pipe connected to the vertical pipe. The vertical pipe is embedded vertically in the center of the asphalt concrete core wall and runs through the entire asphalt concrete core wall. The vertical pipe is arranged vertically. The horizontal pipe is evenly distributed on both sides of the vertical pipe. The direction of the horizontal pipe is parallel to the dam axis. Seepage holes are evenly distributed on the pipe walls of the vertical pipe and the horizontal pipe. The top of the vertical pipe extends to the top of the dam and is equipped with a sealing cap.

[0008] Preferably, the vertical pipe and the horizontal pipe section connected to the vertical pipe are connected by a threaded interface.

[0009] Preferably, the asphalt concrete core wall is multi-layered, and the top of the vertical pipe in the top layer of the asphalt concrete core wall is provided with an openable sealing cover. The lower part of the sealing cover is a threaded interface that is threadedly connected to the top of the vertical pipe.

[0010] Preferably, the heating device is an armored heating rod. The armored heating rod should have sufficient power to soften the asphalt material.

[0011] Preferably, the length of a single section of the steel pipe is consistent with the thickness of a single layer of asphalt concrete core wall, so as to facilitate the compaction construction.

[0012] Preferably, the asphalt concrete core wall is made of concrete and asphalt materials, and the asphalt material filled inside the steel pipe is the same as the asphalt material used in the asphalt concrete core wall.

[0013] The asphalt materials used for the asphalt concrete core wall and the asphalt materials used for repair are of a type with a low softening point and a high penetration. This type of asphalt has a large ductility, good flexibility and resistance to deformation, and can better adapt to the low temperature environment inside the dam, reducing the possibility of cracking in the asphalt concrete core wall.

[0014] Compared with the prior art, this utility model has the following substantial features and advancements:

[0015] By embedding steel pipes during the pouring of the asphalt concrete core wall, drilling or excavation of the asphalt concrete core wall is eliminated during repair, significantly reducing the amount of work involved in repairing cracks and the impact on the dam body. When the armored electric heating rod softens the asphalt material used for repair in the steel pipe, it also softens the asphalt material used in the asphalt concrete core wall around the steel pipe to a certain extent. Under the action of gravity, the two fuse tightly, causing the cracks in the asphalt concrete core wall to disappear and restoring the waterproof effect. The asphalt material consumed in the steel pipe can be replenished from the reserved opening at the top of the dam, allowing the device to be reused.

[0016] The system applied for has a significant effect on repairing cracks, is reliable and safe to operate, and is relatively easy to construct. It can effectively solve the problem of difficult repair of cracks in asphalt concrete core walls and has good application prospects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall layout of this utility model.

[0018] Figure 2 This is a schematic diagram of the assembly of the single-pipe section structure of this utility model.

[0019] Figure 3 This utility model Figure 2 A partial cross-sectional schematic diagram.

[0020] The markings in the diagram are: 1. Asphalt concrete core wall; 2. Vertical pipe; 3. Horizontal pipe; 4. Seepage hole; 7. Armored heating rod; 8. Power supply cable; 9. Sealing cap; 10. Asphalt material. Detailed Implementation

[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] To reduce the impact on the dam when repairing cracks in the asphalt concrete core wall and to solve the problem of poor integration between traditional repair materials and the original core wall, this utility model patent aims to provide a pre-embedded asphalt crack repair system for asphalt concrete core wall dams that can be pre-embedded, excavated-free, and reusable, achieving self-healing of cracks and long-term seepage prevention.

[0023] like Figures 1-3 As shown, the present invention discloses an asphalt concrete core wall dam seepage prevention asphalt pre-embedded crack repair system, comprising an asphalt concrete core wall 1, steel perforated pipes (including vertical pipes 2 and horizontal pipes 3), asphalt material 10, armored electric heating rods 7, and a power supply cable 8. The heating device is an armored electric heating rod 7. The steel perforated pipes are pre-embedded within the asphalt concrete core wall 1, and the heating device is arranged in the center of the steel perforated pipes. The steel perforated pipes are filled with asphalt material 10, and the heating device is encased in the asphalt material 10. The heating device is connected to the power supply cable 8, which is connected to an external power source.

[0024] The steel conduit system includes a vertical pipe 2 and a horizontal pipe 3 connected to the vertical pipe. The vertical pipe 2 is embedded vertically in the center of the asphalt concrete core wall 1, running longitudinally through the entire asphalt concrete core wall 1. The vertical pipe 2 is arranged vertically, and the horizontal pipes 3 are evenly distributed on both sides of the vertical pipe 2. The direction of the horizontal pipes 3 is parallel to the dam axis. Seepage holes 4 are evenly distributed on the pipe walls of the vertical pipe 2 and the horizontal pipe 3. The top of the vertical pipe 2 extends to the top of the dam and is equipped with a sealing cap 9. The pipe sections of the vertical pipe 2 and the horizontal pipe 3 connected to the vertical pipe 2 are connected by threaded interfaces. The asphalt concrete core wall 1 is multi-layered. The top of the vertical pipe 2 in the top layer of the asphalt concrete core wall 1 is equipped with an openable sealing cap 9. The lower part of the sealing cap 9 is a threaded interface that is threadedly connected to the top of the vertical pipe 2.

[0025] The length of a single section of the steel perforated pipe is consistent with the thickness of a single layer of asphalt concrete core wall 1. The asphalt concrete core wall 1 is made of concrete and asphalt 10, and the asphalt material 10 filled inside the steel perforated pipe is the same as the asphalt material 10 used in the asphalt concrete core wall 1.

[0026] The construction process of this system is as follows: Vertical pipe 2 is pre-embedded vertically at the center of the asphalt concrete core wall 1 of the dam body, running longitudinally through the entire asphalt concrete core wall 1. Horizontal pipes 3 are evenly distributed on both sides of vertical pipe 2, parallel to the dam axis. Seepage holes 4 are evenly opened in the walls of both vertical pipe 2 and horizontal pipe 3. The top of vertical pipe 2 extends to the top of the dam and is fitted with a temporary sealing cap 9. During the core wall laying, vertical pipe 2 and horizontal pipe 3 are pre-embedded in the asphalt concrete core wall 1 according to the laying progress, and are connected to each other using threaded joints. Armored heating rods 6 are installed in the steel perforated pipes (horizontal pipe 3 and vertical pipe 2). After the armored heating rods 6 are installed, asphalt material 10 is added to the steel perforated pipes. During laying, temporary sealing caps 9 are used to temporarily seal the upper threaded openings of vertical pipe 2 to prevent material from the asphalt concrete core wall 1 from falling into the pipes and blocking them. The asphalt concrete core wall 1 is poured by mixing asphalt material and concrete, and then compacted. After compaction, the asphalt concrete covering the top of the steel pipe with the sealing cap 9 is removed to expose the steel pipe. The sealing cap 9 is removed, and the next section of steel pipe is installed. The lower vertical pipe 2 is threadedly connected to the upper vertical pipe 3, and the next layer of asphalt concrete core wall 1 is laid.

[0027] The power supply cable 8 of the heating rod is connected to the power source at the top of the dam. The power supply cable 8 is covered with a high-temperature resistant insulation layer to protect the cable from the high temperature of the heating rod and ensure normal and safe power supply.

[0028] The working process of this utility model is as follows: When leakage and cracks are detected in the asphalt concrete core wall 1 of the dam through seepage detection and other methods, the nearest steel pipe is located and the power supply of the armored electric heating rod 7 is turned on. The armored electric heating rod 7 heats and softens the asphalt material 10 around it. Under the action of gravity, the asphalt material 10 seeps out from the seepage holes 4 on the outer wall of the steel pipe, filling the surrounding cracks. At the same time, the heat is conducted to the asphalt material in the asphalt concrete core wall 1 around the steel pipe and softens it to a certain extent, promoting the molecular-level fusion of the asphalt material seeping out of the steel pipe and the asphalt material in the asphalt concrete core wall 1. Since the asphalt concrete core wall 1 around the steel pipe is far from the heat source, its softening degree is controllable and will not affect the overall structure of the asphalt concrete core wall 1 due to large deformation. After the repair is completed, the sealing cover 9 is opened, and new asphalt material 10 can be added through the pipe opening of the vertical pipe 2 on the top of the dam to realize the reuse of the system.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An asphaltic concrete core wall dam impervious asphalt pre-embedded crack repair system characterized by: The application relates to a dam core wall (1) comprising a vertical pipe (2) and a horizontal pipe (3) in communication with the vertical pipe (2), the vertical pipe (2) being vertically embedded in the center of the dam core wall (1) and extending through the whole dam core wall (1), the vertical pipe (2) being vertically arranged, the horizontal pipes (3) being uniformly distributed on both sides of the vertical pipe (2) and being parallel to the dam axis, the vertical pipe (2) and the horizontal pipes (3) being uniformly provided with seepage holes (4) on the pipe walls, and the top of the vertical pipe (2) extending to the dam top and being provided with a sealing cover (9).

2. The asphaltic concrete core wall dam impervious asphalt pre-buried crack repair system according to claim 1, characterized in that: The vertical pipe (2) and the horizontal pipe (3) are connected through threaded interfaces between pipe sections.

3. The asphaltic concrete core wall dam impervious asphalt pre-embedded crack repair system according to claim 2, characterized in that: The dam core wall (1) is multi-layered, the top of the vertical pipe (2) in the topmost layer of the dam core wall (1) being provided with an openable sealing cover (9), the lower part of the sealing cover (9) being a threaded interface and being screwed with the top of the vertical pipe (2).

4. The asphaltic concrete core wall dam impervious asphalt pre-buried crack repair system according to claim 3, characterized in that: The heating device is a sheathed electric heating rod (7).

5. The asphaltic concrete core wall dam impervious asphalt pre-embedded crack repair system according to claim 1, characterized in that: The length of a single section of the vertical pipe is consistent with the filling thickness of a single layer of the dam core wall (1).

6. The asphaltic concrete core wall dam impervious asphalt pre-buried crack repair system according to claim 1, characterized in that: The dam core wall (1) is made of concrete and asphalt material (10), and the asphalt material (10) filled in the vertical pipe is the same as the asphalt material (10) used in the dam core wall (1).

7. The asphaltic concrete core wall dam impervious asphalt pre-buried crack repair system according to claim 1, characterized in that: ​

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