High dam body diversion bottom hole vent hole plugging structure

Abstract

This utility model provides a sealing structure for the vent hole of the diversion bottom hole of a high dam, including a dam body, a diversion bottom hole, and a vent hole. The diversion bottom hole is opened inside the dam body, and the vent hole is opened inside the dam body and located at the top of the diversion bottom hole. Compared with the prior art, this utility model has the following beneficial effects: By extending the diversion rod into the vent hole, the sealing block moves to the bottom end of the vent hole through the sealing ring and seals the bottom end of the vent hole. Then, the diversion bucket is embedded at the top of the vent hole. At the same time, the mounting plate is placed on the top of the dam body, so that the threaded hole on the mounting plate is aligned with the threaded hole on the dam body. Concrete slurry is poured from the top of the diversion bucket and conveyed downward through multiple outlets. The concrete slurry can flow along the diversion rod into the interior of the vent hole, reducing air bubbles generated during the concrete pouring and sealing process, improving the firmness of the concrete pouring layer, and effectively improving the sealing stability of the vent hole.

Description

Technical Field

[0001] This utility model is a sealing structure for the vent hole of the diversion bottom hole of a high dam body, belonging to the field of water conservancy and hydropower engineering equipment. Background Technology

[0002] During the construction of large hydropower stations, the upstream water level is high, the water level rises rapidly, and the diversion flow is large. A common method for diversion is to combine diversion tunnels with diversion bottom holes in the dam body. These are then sealed separately. The diversion bottom hole sealing structure is part of the permanent structure of the hydropower station. For dams hundreds of meters high, the maximum water head during normal operation can reach hundreds of meters, placing high demands on the seepage prevention of the sealing structure. During the closure of the gate at the diversion bottom hole sealing point, alternating open and full flow conditions may occur in the flow channel. When the gate is closed with full flow, negative pressure may occur after the gate, causing gate vibration. Therefore, a vent is opened at the top of the downstream hole of the diversion bottom hole, and concrete is backfilled into the vent for sealing. Currently, the vents are generally installed by pre-embedding steel pipes inside the dam body. The problem with this is that when the backfilled concrete shrinks, it may detach from the vent pipe wall, forming a seepage channel. This results in incomplete sealing of the vent, damaging the integrity of the dam body and affecting the overall sealing effect of the diversion bottom hole.

[0003] In existing technologies, in order to improve the tightness of vent hole sealing, vent hole sealing devices are usually made by welding steel to the bottom of the vent hole and then pouring concrete into the vent hole. When the concrete is poured directly from top to bottom, the concrete slurry collides with the bottom of the inner wall of the vent hole, resulting in the formation of a large number of air bubbles in the slurry. This results in a large number of air bubbles inside the formed concrete sealing layer, which reduces the tightness and firmness of the concrete sealing layer and also reduces the stability of the vent hole sealing.

[0004] In summary, this utility model provides a sealing structure for the vent holes of the diversion bottom hole in a high dam body to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a sealing structure for the ventilation holes at the bottom of the diversion channel of a high dam, in order to solve the problem mentioned in the background art where a large number of air bubbles are generated during the concrete pouring process, leading to a decrease in the density of the sealing layer.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for the venting hole of the diversion bottom hole in a high dam body, comprising a dam body, a diversion bottom hole, and a venting hole. The diversion bottom hole is located inside the dam body, and the venting hole is located inside the dam body and at the top of the diversion bottom hole. The top of the venting hole extends to the top of the dam body, and the bottom of the venting hole is connected to the diversion bottom hole. An installation plate is installed on the top of the dam body, directly above the venting hole. A diversion bucket passes through the top and bottom of the installation plate, and the bottom of the diversion bucket extends into the venting hole. A diversion rod passes through the bottom of the diversion bucket, and a sealing block is fixedly connected to the bottom of the diversion rod at the bottom of the venting hole. Four discharge ports are evenly distributed around the bottom of the diversion bucket around the diversion rod. A cover plate is placed on the top of the installation plate.

[0007] Furthermore, a long screw passes through the top of the cover plate, and the top of the guide rod extends to the bottom of the cover plate and is embedded inside the cover plate.

[0008] Furthermore, the bottom end of the long rod screw passes through the top end of the guide rod and extends into the interior of the guide rod, and a ring is fixedly installed at the top end of the long rod screw.

[0009] Furthermore, the guide rod contacts the cover plate, and the long rod screw is threadedly connected to the guide rod.

[0010] Furthermore, a sealing ring is fitted around the outside of the sealing block, and the outer surface of the sealing block is in contact with the inner wall of the vent hole through the sealing ring.

[0011] Furthermore, the top of the guide bucket is flush with the top of the mounting plate, and a rubber sleeve is fixedly fitted on the outside of the guide bucket and outside the vent hole.

[0012] Furthermore, fastening screws are inserted through both sides of the top of the cover plate, and the bottom ends of the two fastening screws penetrate the mounting plate and extend into the interior of the dam body.

[0013] The beneficial effects of this utility model are:

[0014] By inserting the guide rod into the vent hole, the sealing block moves to the bottom of the vent hole via the sealing ring, sealing the bottom of the vent hole. Then, the guide bucket is embedded at the top of the vent hole. At the same time, the mounting plate is placed on the top of the dam body, aligning the threaded holes on the mounting plate with the threaded holes on the dam body. Concrete slurry is poured from the top of the guide bucket and conveyed downwards through multiple outlets. The concrete slurry can flow along the guide rod into the interior of the vent hole, reducing air bubbles generated during the concrete pouring and sealing process, improving the firmness of the concrete pouring layer, and effectively improving the stability of the vent hole sealing.

[0015] By aligning the threaded holes on the cover plate with the threaded holes on the mounting plate, and then screwing the fastening screws into the threaded holes downwards, a fixed connection is achieved between the cover plate, the mounting plate, and the dam body. This allows for rapid sealing of the vent hole. Simultaneously, the top of the guide rod can be embedded in the top of the cover plate. Then, aligning the long rod screw with the threaded hole at the center of the top of the cover plate, and screwing it downwards into the cover plate and guide rod sequentially, completes the fixed connection between the guide rod and the cover plate. This connection structure between the guide rod, sealing block, and cover plate supports and bears the weight of the concrete sealing layer cast inside the vent hole, reducing the phenomenon of the concrete layer sliding downwards during cooling and shrinkage. This reduces the frequency of periodic inspections of the sealed vent hole and improves the sealing effect. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1 This is a perspective view of a sealing structure for the ventilation hole at the bottom of the diversion channel of a high dam, according to this utility model.

[0018] Figure 2 This is a main sectional view of a sealing structure for the ventilation hole at the bottom of the diversion channel of a high dam according to this utility model;

[0019] Figure 3 for Figure 2 The front view of the guide rod shown;

[0020] Figure 4 for Figure 3 Top view of the cover plate shown;

[0021] Figure 5 for Figure 2 The top view of the guide bucket shown.

[0022] In the diagram: 1. Dam body; 2. Diversion bottom hole; 3. Ventilation hole; 4. Mounting plate; 5. Diversion bucket; 6. Diversion rod; 7. Sealing block; 8. Discharge port; 9. Cover plate; 10. Long rod screw; 11. Fastening screw; 12. Ring; 13. Rubber sleeve; 14. Sealing ring. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figure 1-5This utility model provides a technical solution: a sealing structure for the vent hole of the diversion bottom hole of a high dam, including a dam body 1, a diversion bottom hole 2, and a vent hole 3. The diversion bottom hole 2 is opened inside the dam body 1, and the vent hole 3 is opened inside the dam body 1 and located at the top of the diversion bottom hole 2. The top end of the vent hole 3 extends to the top of the dam body 1, and the bottom end of the vent hole 3 is connected to the diversion bottom hole 2. An installation plate 4 is installed on the top of the dam body 1 and directly above the vent hole 3. The top of the installation plate 4... A guide hopper 5 runs through the bottom of the hopper, and the bottom end of the guide hopper 5 extends into the interior of the vent 3. A guide rod 6 runs through the bottom of the guide hopper 5, and a sealing block 7 is fixedly connected to the bottom end of the guide rod 6 at the bottom end of the vent 3. Four discharge ports 8 are evenly opened around the bottom of the guide hopper 5 around the guide rod 6. A cover plate 9 is placed on the top of the mounting plate 4, and a long rod screw 10 runs through the top of the cover plate 9. The top of the guide rod 6 extends to the bottom of the cover plate 9 and is embedded in the interior of the cover plate 9.

[0025] Please see Figure 2-4 The bottom end of the long screw 10 passes through the top end of the guide rod 6 and extends into the interior of the guide rod 6. A ring 12 is fixedly installed at the top end of the long screw 10. The guide rod 6 is in contact with the cover plate 9. The long screw 10 is threadedly connected to the guide rod 6. A sealing ring 14 is fitted on the outside of the sealing block 7. The outer surface of the sealing block 7 is in contact with the inner wall of the vent hole 3 through the sealing ring 14. The sealing ring 14 can improve the sealing performance of the sealing block 7 to the bottom end of the vent hole 3.

[0026] Please see Figure 2-5 The top of the guide bucket 5 is flush with the top of the mounting plate 4. A rubber sleeve 13 is fixedly fitted on the outside of the guide bucket 5 and the outside of the vent 3. The rubber sleeve 13 can improve the sealing of the connection between the guide bucket 5 and the vent 3. Fastening screws 11 are inserted through both sides of the top of the cover plate 9. The bottom ends of the two fastening screws 11 are inserted through the mounting plate 4 and extend into the interior of the dam body 1. The top of the two fastening screws 11 are fixedly installed with protrusions. The protrusions facilitate manual rotation of the fastening screws 11. The top of the cover plate 9, the mounting plate 4 and the dam body 1 are all provided with threaded holes for threaded connection with the fastening screws 11. When the threaded holes on the cover plate 9, the mounting plate 4 and the dam body 1 are aligned vertically, the fastening screws 11 can be rotated and screwed into the threaded holes to complete the fixed connection between the cover plate 9, the mounting plate 4 and the dam body 1.

[0027] Detailed Implementation: When permanent sealing of the vent hole 3 is required, the guide rod 6 can be inserted into the vent hole 3, allowing the sealing block 7 to move to the bottom of the vent hole 3 via the sealing ring 14, thus sealing the bottom of the vent hole 3. Then, the guide bucket 5 is embedded at the top of the vent hole 3. Simultaneously, the mounting plate 4 is placed on top of the dam body 1, aligning the threaded holes on the mounting plate 4 with the threaded holes on the dam body 1. Concrete slurry is poured from the top of the guide bucket 5 and conveyed downwards through multiple outlets 8. The concrete slurry can flow along the guide rod 6 into the interior of the vent hole 3, reducing air bubbles generated during the concrete pouring and sealing process, improving the firmness of the concrete pouring layer, and effectively enhancing the sealing stability of the vent hole 3.

[0028] After the pouring is completed, align the threaded hole on the cover plate 9 with the threaded hole on the mounting plate 4, and screw the fastening screw 11 into the threaded hole downwards to complete the fixed connection between the cover plate 9, the mounting plate 4 and the dam body 1, thereby enabling the rapid sealing of the vent hole 3.

[0029] Meanwhile, the top of the guide rod 6 can be embedded in the top of the cover plate 9. Then, the long rod screw 10 is aligned with the threaded hole in the center of the top of the cover plate 9 and screwed downwards into the cover plate 9 and the guide rod 6 in sequence, completing the fixed connection between the guide rod 6 and the cover plate 9. This allows the connection structure between the guide rod 6, the sealing block 7 and the cover plate 9 to support and bear the weight of the concrete sealing layer poured inside the vent hole 3, reducing the phenomenon of the concrete layer sliding down when it cools and shrinks. This reduces the frequency of periodic inspection of the sealed vent hole 3 and improves the sealing effect of the vent hole 3.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing structure for the vent hole of the diversion bottom hole of a high dam body, comprising the dam body (1), the diversion bottom hole (2), and the vent hole (3), characterized in that: The bottom guide hole (2) is opened inside the dam body (1). The vent hole (3) is opened inside the dam body (1) and located at the top of the bottom guide hole (2). The top of the vent hole (3) extends to the top of the dam body (1). The bottom of the vent hole (3) is connected to the bottom guide hole (2). An installation plate (4) is installed on the top of the dam body (1) and directly above the vent hole (3). A guide bucket (5) passes through the top and bottom of the installation plate (4). The bottom of the guide bucket (5) extends into the vent hole (3). A guide rod (6) passes through the bottom of the guide bucket (5). A sealing block (7) is fixedly connected to the bottom of the guide rod (6) and located at the bottom of the vent hole (3). Four discharge ports (8) are evenly opened around the bottom of the guide bucket (5) around the guide rod (6). A cover plate (9) is placed on the top of the installation plate (4).

2. The sealing structure for the vent hole of the diversion bottom hole of a high dam body according to claim 1, characterized in that: The top of the cover plate (9) is pierced by a long rod screw (10), and the top of the guide rod (6) extends to the bottom of the cover plate (9) and is embedded in the interior of the cover plate (9).

3. The sealing structure for the vent hole of the diversion bottom hole of a high dam body according to claim 2, characterized in that: The bottom end of the long rod screw (10) passes through the top end of the guide rod (6) and extends into the interior of the guide rod (6). A ring (12) is fixedly installed on the top end of the long rod screw (10).

4. The sealing structure for the vent hole of the diversion bottom hole of a high dam body according to claim 2, characterized in that: The guide rod (6) is in contact with the cover plate (9), and the long rod screw (10) is threadedly connected to the guide rod (6).

5. The sealing structure for the vent hole at the bottom of the diversion channel of a high dam body according to claim 1, characterized in that: The sealing block (7) is fitted with a sealing ring (14) on its outside, and the outer surface of the sealing block (7) is in contact with the inner wall of the vent (3) through the sealing ring (14).

6. The sealing structure for the vent hole of the diversion bottom hole of a high dam body according to claim 1, characterized in that: The top of the guide bucket (5) is flush with the top of the mounting plate (4), and a rubber sleeve (13) is fixedly fitted on the outside of the guide bucket (5) and outside the vent (3).

7. The sealing structure for the vent hole of the diversion bottom hole of a high dam body according to claim 1, characterized in that: Both sides of the top of the cover plate (9) are provided with fastening screws (11), and the bottom ends of the two fastening screws (11) penetrate the mounting plate (4) and extend into the interior of the dam body (1).

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