Plugging structure for reverse drainage pipe of concrete faced rockfill dam body

Abstract

The utility model discloses a concrete faced rockfill dam body reverse drainage pipe plugging structure which comprises a toe board, a water collecting structure arranged on the downstream portion of the toe board and a first pipe pre-buried in the toe board and extending into the water collecting structure, the toe board is filled with a blanket, one end of the first pipe is connected with a second pipe, and the other end of the first pipe is connected with the second pipe. The second pipe extends towards the upstream slope surface of the toe board, a plurality of drainage valves are arranged on the second pipe at intervals, and concrete is poured on the periphery of the second pipe. According to the utility model, the first pipe is connected to the upstream slope surface of the toe board through the second pipe, and meanwhile, the second pipe can synchronously ascend with the blanket in the construction process, so that water in the dam can be smoothly discharged in the blanket filling process, and the jacking damage of a panel in the blanket construction process can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower facilities, and in particular relates to a reverse drainage pipe blocking structure for a panel rockfill dam body. Background Art

[0002] In order to make full use of excavated materials, pumped storage power stations often use face rockfill dams as water retaining structures. During the construction of face rockfill dam panels, in order to prevent the reverse water pressure inside the dam body from displacing the face plate upstream, it is generally necessary to set a reverse drainage pipe inside the dam body to lower the water level inside the dam.

[0003] Chinese utility model patent CN 206599762U discloses a reverse drainage plugging device for a hydropower station dam, which includes a concrete panel, a toe plate, a cushion material, and a special cushion material. A water collecting body is arranged in the dam body at a certain distance from the toe plate, a drainage pipe is arranged between the toe plate of the dam and the water collecting body, a grouting bag is arranged in the drainage pipe near one end of the cushion material, a grouting ring and an exhaust pipe with a valve are arranged outside the end of the drainage pipe extending out of the toe plate, a drainage pipe plugging steel plate is arranged at the drainage pipe port, a connected grouting pipe is arranged on the drainage pipe plugging steel plate, a grouting pipe plugging steel plate is arranged at one end of the grouting pipe, and a plurality of anchor rods are arranged in a direction parallel to the horizontal plane on the end face of the toe plate. Before the construction of the patented panel rockfill dam, the reverse drainage pipe is blocked on the horizontal toe plate. However, when this technical means is used, if the water level in the dam body rises due to rainfall, the reverse drainage pipe cannot discharge the water in the dam, and the weight of the upstream covering is not enough to offset the reverse water pressure in the dam, the panel will be supported upstream and damaged. This situation often occurs in actual projects. Utility Model Content

[0004] The utility model aims to provide a reverse drainage pipe blocking structure for a panel rockfill dam body, so as to solve the technical problem of top support damage of the panel during the paving construction process.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] A reverse drainage pipe blocking structure for a face rockfill dam comprises a toe plate, a water collecting structure arranged downstream of the toe plate, a first pipe pre-buried in the toe plate and extending into the water collecting structure, a cover is built on the toe plate, one end of the first pipe is connected to a second pipe, the second pipe extends to the slope surface upstream of the toe plate, a plurality of drainage valves are arranged at intervals on the second pipe, and concrete is poured on the outer periphery of the second pipe.

[0007] Therefore, the utility model completes the drainage of the water collection structure through the cooperation of the second pipe with the first pipe. The second pipe extends to the slope surface of the upstream side slope of the toe plate, and a plurality of drainage valves are arranged at intervals on the second pipe. In this way, after the blanket filling reaches the corresponding drainage valve height, the valve at the corresponding elevation can be closed, and the second pipe can continue to be installed upward, so that the second pipe and the blanket can be risen synchronously, effectively ensuring the smooth discharge of water in the dam during the blanket filling process.

[0008] Furthermore, the poured concrete is anchored on the slope surface by anchor bars.

[0009] Furthermore, the drain valve is a three-way valve.

[0010] Furthermore, the interval between two adjacent drainage valves is 2 to 3 meters.

[0011] The utility model has the following advantages: the utility model connects the first pipe to the upstream slope of the toe board through the second pipe, and the second pipe can rise synchronously with the blanket during the construction process, ensuring that the water in the dam is discharged smoothly during the blanket filling process, thereby ensuring that the panel will not be damaged during the blanket construction process. The utility model can effectively ensure the safety of the panel structure during the blanket construction process, has achieved good results through engineering practice, and has a wide range of engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the reverse drainage pipe blocking structure of the panel rockfill dam body of the utility model;

[0013] Figure 2 This is a second tube cross-sectional view of the utility model.

[0014] Explanation of markings in the figure: 1. Panel; 2. Toe board; 3. First pipe; 4. Second pipe; 5. Drain valve; 6. Concrete; 7. Anchor reinforcement; 8. Blanket. DETAILED DESCRIPTION

[0015] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 1 and Figure 2As shown, a reverse drainage pipe plugging structure of a face rockfill dam body in this embodiment includes a toe plate 2, a water collection structure arranged downstream of the toe plate 2, a first pipe 3 pre-buried in the toe plate 2 and extending into the water collection structure, a blanket 8 is built on the toe plate 2, one end of the first pipe 3 is connected to a second pipe 4, the second pipe 4 extends to the upstream slope surface of the toe plate 2, and a plurality of drainage valves 5 are arranged on the second pipe 4 at intervals, the drainage valves 5 are preferably three-way valves, and the interval between two adjacent drainage valves 5 is 2 to 3m, preferably 2m. Concrete 6 is poured on the outer periphery of the second pipe 4, and the poured concrete 6 is anchored on the slope surface by anchor bars 7.

[0017] This embodiment also provides a construction method for the above-mentioned reverse drainage pipe blocking structure of the face rockfill dam body, comprising the following steps:

[0018] Step 1: Before the blanket 8 is filled, the first pipe 3 is connected to the upstream slope surface of the toe board 2 by using the second pipe 4.

[0019] Step 2: Install a three-way valve every 2m from bottom to top in the second pipe 4 so that water can flow out from the side of the pipe. When the blanket 8 is filled to the height of the corresponding drain valve, close the valve at the corresponding elevation and continue to connect the second pipe 4 upward.

[0020] Step 3: When the second pipe 4 is close to the top elevation of the blanket 8, the second pipe 4 is blocked. The blockage is backfilled with expanded cement mortar, and appropriate pressure can be applied. After the grouting is completed, the grouting nozzle is cut off and the steel pipe is welded with a steel plate.

[0021] Step 4: Concrete 6 is poured throughout the outer periphery of the second pipe 4 during the construction process, and the concrete 6 is anchored on the slope surface through anchor bars 7.

[0022] By adopting the above construction method, the second pipe 4 is raised synchronously with the blanket 8 during the construction process, ensuring that the water in the dam can be discharged smoothly during the filling process of the blanket, avoiding the top support damage of the panel.

[0023] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A reverse drainage pipe plugging structure for a face rockfill dam, comprising a toe plate (2), a water collection structure arranged downstream of the toe plate (2), a first pipe (3) pre-buried in the toe plate (2) and extending into the water collection structure, and a blanket (8) built on the toe plate (2), characterized in that: One end of the first pipe (3) is connected to the second pipe (4), the second pipe (4) extends toward the upstream slope surface of the toe plate (2), a plurality of drainage valves (5) are arranged at intervals on the second pipe (4), and concrete (6) is poured around the outer periphery of the second pipe (4).

2. The reverse drainage pipe blocking structure of a face rockfill dam according to claim 1 is characterized in that: The poured concrete (6) is anchored on the slope surface via anchor bars (7).

3. The reverse drainage pipe blocking structure of a face rockfill dam according to claim 1 is characterized in that: The drainage valve (5) is a three-way valve.

4. The reverse drainage pipe blocking structure of a face rockfill dam according to claim 1 is characterized in that: The interval between two adjacent drainage valves (5) is 2 to 3 m.

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