Dam leakage monitoring structure for preventing downstream tail water submerging of dam

Abstract

The dam leakage monitoring structure comprises a water collecting well on the downstream portion of a measuring weir plate, the water collecting well and seepage interception walls on the two banks form a full-section enclosure, and the top elevation of the water collecting well and the top elevation of the seepage interception walls on the two banks are both higher than the downstream tail water level. The measuring weir plate is communicated with the diversion canal along the upstream direction; and the water pumping equipment is used for pumping leakage water in the water collecting well to downstream tail water. The measuring weir has the advantages that the structural design is reasonable, downstream tail water of the dam is prevented from submerging the measuring weir, and normal observation of the measuring weir in the whole time period is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water volume monitoring, in particular to a dam leakage monitoring structure for preventing the tailwater downstream of the dam from being flooded. Background Art

[0002] Hydropower projects usually set up a water-measuring weir downstream of the dam to monitor the total leakage of the dam. The water-measuring weir behind the dam is usually set behind the dam foot to completely cut off the leakage. The water-measuring weir is combined with the cut-off wall to ensure that the leakage water only flows downstream through the water-measuring weir.

[0003] Many dams are adversely affected by flood discharges, and the water measuring weir may be submerged by the downstream tailwater, resulting in the inability to observe the water measuring weir normally during certain periods of time. The water measuring weir is the most important monitoring facility for dam safety monitoring, and normal observation at all times is particularly important. Utility Model Content

[0004] The utility model aims to provide a dam leakage monitoring structure which is suitable for full-time leakage observation and improves data continuity to prevent the tailwater from flooding downstream of the dam.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A dam seepage monitoring structure for preventing tailwater from flooding downstream of the dam, comprising a water collection well downstream of a water measuring weir plate, the water collection well and the seepage cut-off walls on both sides forming a full-section enclosure, the water collection well top elevation and the seepage cut-off walls on both sides being higher than the downstream tailwater level, the water measuring weir plate being connected to a water diversion channel in an upstream direction; and also comprising pumping equipment for pumping seepage water in the water collection well to the downstream tailwater.

[0007] Furthermore, the water collection well is a well body with a cavity inside and cut-off walls on all sides, and the cut-off walls penetrate deep into the bedrock or the impermeable layer.

[0008] Furthermore, the water collection well is composed of a cutoff wall 1 with the same elevation on three sides and a cutoff wall 2 on one side. The cutoff wall 2 is connected to a water diversion channel connected to the upstream of the weir plate of the water measuring weir, and the top elevation of the cutoff wall 2 is the same as the top elevation of the water diversion channel.

[0009] Furthermore, the weir plate of the water measuring weir is perpendicular to the water flow direction, and the downstream edge of the weir is at 45 degrees.

[0010] Furthermore, the weir plate of the water measuring weir may be a triangular weir, a trapezoidal weir or a rectangular weir.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The utility model discloses a dam leakage monitoring structure for preventing the tailwater downstream of the dam from flooding. The structure is reasonably designed, and the tailwater downstream of the dam is prevented from flooding the water measuring weir, so as to ensure that the water measuring weir can be normally observed at all times. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stereogram of the utility model.

[0014] Figure 2 It is a front view of the utility model.

[0015] Figure 3 It is a top view of the utility model.

[0016] Figure 4 It is a side view of the utility model.

[0017] Figure 5 It is a stereoscopic diagram of the water collection well of the utility model.

[0018] Figure numerals: 1. Weir plate of water measuring weir; 2. Water collecting well; 21. Water cut-off wall 1; 22. Water cut-off wall 2; 3. Seepage cut-off walls on both sides; 4. Water diversion channel; 5. Pumping equipment. DETAILED DESCRIPTION

[0019] The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 4 As shown, a dam seepage monitoring structure for preventing tailwater from flooding downstream of the dam includes a water collection well 2 downstream of a measuring weir plate 1, the water collection well 2 and the seepage cut-off walls 3 on both sides form a full-section enclosure, the top elevation of the water collection well 2 and the top elevation of the seepage cut-off walls 3 on both sides are higher than the downstream tailwater level, ensuring that the downstream tailwater does not flood the measuring weir and that the measuring weir can be monitored normally at all times, the water measuring weir plate 1 is connected to a rectangular water diversion channel 4 along the upstream direction; and also includes a pumping device 5, which can pump the leakage water in the water collection well 2 to the downstream tailwater.

[0021] like Figure 5 As shown, the water collection well 2 is a well body with a cavity inside and cut-off walls around it. The cut-off walls penetrate into the bedrock or to a relatively impermeable layer. The water collection well 2 is used to store leaking water. The cut-off wall of the water collection well 2 adopts a reinforced concrete structure and has good anti-seepage performance. Furthermore, the water collection well 2 is composed of a cut-off wall 1 21 with the same elevation on three sides and a cut-off wall 2 22 on one side. The cut-off wall 2 22 is connected to the water diversion channel 4 connected to the upstream of the water measuring weir plate 1. The top elevation of the cut-off wall 2 22 is the same as the top elevation of the water diversion channel 4, ensuring smooth water flow and normal observation of the water measuring weir.

[0022] Likewise, the cut-off walls 3 on both banks also penetrate deep into the bedrock or relatively impermeable layers.

[0023] The water diversion channel 4 is made of concrete or stainless steel. The rectangular water diversion channel 4, as a weir groove, should have a length greater than 7 times the maximum water head on the weir, and a total length of not less than 2m. The lengths of the water diversion channel 4 (weir groove) upstream and downstream of the water measuring weir plate 1 should not be less than 1.5m and 0.5m respectively, and the two sides of the water diversion channel 4 (weir groove) should be parallel and vertical.

[0024] The pumping equipment 5 has the function of pumping the leaking water in the water collection well 2 to the downstream tail water. The pumping equipment 5 timely pumps the leaking water in the water collection well 2 to the downstream of the water collection well 2, ensuring that the leaking water in the water collection well 2 is kept at a lower position and the leaking water does not overflow, thereby not affecting the normal observation of the water measuring weir.

[0025] The water measuring weir plate 1 is perpendicular to the water flow direction, and the downstream edge of the weir is 45 degrees. According to the flow rate of the leaking water, a water measuring weir plate 1 of a suitable range is selected, and the water measuring weir plate 1 can be a triangular weir, a trapezoidal weir or a rectangular weir.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A dam leakage monitoring structure for preventing tailwater flooding downstream of the dam, characterized in that: It includes a water collection well downstream of the weir plate of the water measuring weir, the water collection well and the cut-off walls on both sides form a full-section enclosure, the top elevation of the water collection well and the top elevation of the cut-off walls on both sides are higher than the downstream tail water level, and the weir plate of the water measuring weir is connected to the water diversion channel along the upstream direction; it also includes pumping equipment to pump the leaking water in the water collection well to the downstream tail water.

2. A dam leakage monitoring structure for preventing tailwater flooding downstream of a dam according to claim 1, characterized in that: The water collection well is a well body with a cavity inside and cut-off walls around it, and the cut-off walls penetrate deep into the bedrock or the impermeable layer.

3. A dam leakage monitoring structure for preventing tailwater flooding downstream of a dam according to claim 2, characterized in that: The water collection well is composed of a cutoff wall 1 with the same elevation on three sides and a cutoff wall 2 on one side. The cutoff wall 2 is connected to a water diversion channel connected to the upstream of the weir plate of the water measuring weir. The top elevation of the cutoff wall 2 is the same as the top elevation of the water diversion channel.

4. A dam leakage monitoring structure for preventing tailwater flooding downstream of a dam according to claim 1, characterized in that: The weir plate of the water measuring weir is perpendicular to the water flow direction, and the downstream edge of the weir is at 45 degrees.

5. A dam leakage monitoring structure for preventing tailwater flooding downstream of a dam according to claim 4, characterized in that: The weir plate of the water measuring weir may be a triangular weir, a trapezoidal weir or a rectangular weir.

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