Steel panel rock-fill concrete gravity dam

Abstract

The invention discloses a steel panel rock-fill concrete gravity dam which comprises a dam abutment section and a riverbed section, a side slope is connected with the dam abutment section through a water stop system, and the dam abutment section and the riverbed section are each composed of a dam body steel panel rock-fill concrete layer and a dam foundation cushion layer self-compacting concrete layer. The upstream face of the dam body steel panel rock-fill concrete layer adopts a steel panel, conventional rock-fill concrete is arranged on the downstream of the steel panel, and a plurality of U-shaped embedded steel bars are welded to the downstream face of the steel panel. A steel plate is pre-embedded in the position, making contact with the upper steel panel, of the dam foundation cushion layer self-compacting concrete layer; a formwork is arranged at the joint of the steel panel and the side slope; an expansion joint is arranged between the dam abutment dam section and the riverbed dam section, and a copper water stop structure is arranged in the expansion joint. According to the steel panel rock-fill concrete gravity dam, the problems that existing self-compacting concrete is large in work amount, an anti-cracking reinforcing mesh needs to be arranged, and a formwork needs to be arranged on the upstream are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of gravity dam design and relates to a steel-faced rockfill concrete gravity dam. Background Art

[0002] In recent years, rockfill concrete dam construction technology has been continuously practiced and innovated in many projects, and a design specification system has been established, including "Technical Guidelines for Cemented Granular Material Dam Construction SL678", "Technical Guidelines for Rockfill Concrete Dam Construction NB / T10077", and "Specifications for Rockfill Concrete Construction of Hydropower and Water Conservancy Projects DL / T5806". In the design of conventional rockfill concrete gravity dams, a 0.5m to 1.0m thick anti-seepage layer needs to be set on the upstream face of the rockfill concrete dam, using highly self-compacting concrete and anti-cracking steel mesh.

[0003] However, in actual construction, due to the high fluidity of high self-compacting concrete, the downstream surface of the actually poured high self-compacting concrete is a slope gentler than 1:1, which leads to a substantial increase in the amount of work. At the same time, anti-cracking steel mesh is required. In addition, during concrete construction, formwork needs to be set up upstream, which further increases the construction difficulty and project cost. Therefore, a new rockfill concrete dam structure is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a steel-faced rockfill concrete gravity dam, which solves the problems that the existing panel rockfill concrete gravity dam needs to be equipped with an upstream anti-seepage panel, the amount of high self-compacting concrete used is large, and the construction process is complicated, such as the need to configure anti-cracking steel mesh and set up formwork upstream.

[0005] The technical scheme adopted by the present invention is that the steel-faced rockfill concrete gravity dam includes a dam shoulder section and a riverbed section, a slope is excavated on the terrain on one side of the dam shoulder section, a dense mesh is set at a distance of one meter from the slope on the outer side of the dam shoulder section, and a self-compacting concrete layer of the dam shoulder is poured between the slope and the dense mesh, and the dam shoulder section and the riverbed section are both composed of a dam body steel-faced rockfill concrete layer and a dam foundation cushion self-compacting concrete layer; The water-facing surface of the steel-faced rockfill concrete layer of the dam body is made of steel panels, and the downstream of the steel panels is conventional rockfill concrete. A number of first U-shaped embedded steel bars are welded on the downstream side of the steel panels, and the first U-shaped embedded steel bars are cast in the conventional rockfill concrete. An embedded steel plate is set between the contact part of the self-compacting concrete layer of the dam foundation cushion and the steel panel. The embedded steel plate is firmly cast with the self-compacting concrete layer of the dam foundation cushion using the second U-shaped embedded steel bar, and the steel panel and the embedded steel plate are welded; a template is set at the connection part of the steel panel and the slope; An expansion joint is provided between the dam shoulder section and the riverbed section, and a copper water-stop structure is arranged in the expansion joint.

[0006] The present invention is also characterized in that: A water-stop system is provided between the slope and the dam abutment section.

[0007] The length of the abutment section and the riverbed section are both 40~50m.

[0008] The slope ratio of the slope is 1:m, where m is 0.2~3.

[0009] The spacing between the first U-shaped embedded steel bars in the dam body steel face rockfill concrete layer structure is 600~800mm, arranged in a plum blossom shape. The diameter of the first U-shaped embedded steel bars is 18~25mm, and the total length is 1.3m.

[0010] The thickness of the self-compacting concrete layer of the dam foundation cushion is 1~2m, and the spacing between the second U-shaped embedded steel bars is 600mm~800mm.

[0011] The slope ratio of the water-facing surface of the dam body's steel face rockfill concrete layer is 1:n, where n is 0~0.8.

[0012] The thickness of the steel panel is 8mm~12mm, and the ends on both sides of the steel panel are folded into the conventional rock-fill concrete downstream, and the length folded into the conventional rock-fill concrete is not less than 1m.

[0013] The expansion joint width is 1~2cm.

[0014] The copper water stop structure comprises a first copper water stop sheet, a first low-evolution foam board, a second copper water stop sheet and a second low-evolution foam board, and the first copper water stop sheet and the second copper water stop sheet are welded; The first copper water stop and the first low-evolution foam plate are arranged in the expansion joint of the rockfill concrete layer section of the steel face plate of the dam body, the nose of the first copper water stop faces downstream, the outer side of the nose of the first copper water stop contacts the first low-evolution foam plate, the two flanges of the first copper water stop are respectively welded to the steel face plate, and the first rubber rod is arranged between the noses of the first copper water stop; The second copper waterstop and the second low-expansion foam board are arranged in the expansion joint of the self-compacting concrete layer section of the dam foundation cushion layer, the nose of the second copper waterstop faces downstream, the outer side of the nose of the second copper waterstop contacts the second low-expansion foam board, and the two flanges of the second copper waterstop are buried in the self-compacting concrete layer of the dam foundation cushion layer; a second rubber rod is arranged between the noses of the second copper waterstop; the contact part between the lower part of the second copper waterstop and the bedrock is connected and closed by a waterstop pit.

[0015] The beneficial effects of the present invention are: (1) The steel-faced rockfill concrete gravity dam of the present invention comprises a dam shoulder section and a riverbed section. A copper waterstop structure is arranged in each dam section. The dam shoulder section and the riverbed section are both composed of a dam body steel-faced rockfill concrete layer and a dam foundation cushion self-compacting concrete layer. The dam body steel-faced rockfill concrete layer structure is composed of a steel face plate, U-shaped embedded steel bars and conventional rockfill concrete. Since the high self-compacting concrete anti-seepage layer and anti-cracking steel mesh are eliminated, the engineering quantity and engineering cost are greatly reduced. (2) The steel-faced rockfill concrete gravity dam of the present invention eliminates the high self-compacting concrete anti-seepage layer and the anti-cracking steel mesh, adopts 8-12 mm steel plates as the anti-seepage layer, and directly uses the steel face plate as the upstream formwork for concrete construction, thus reducing the steps of erecting the anti-cracking steel mesh and concrete formwork, greatly simplifying the construction procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the steel-faced rockfill concrete gravity dam of the present invention; Figure 2 It is a schematic diagram of the upstream section of the steel-faced rockfill concrete gravity dam of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the abutment section of the steel-faced rockfill concrete gravity dam at position AA of the present invention; Figure 4 It is a schematic diagram of the copper water stop structure at BB in the steel face rockfill concrete gravity dam of the present invention; Figure 5 It is a schematic diagram of the copper water stop structure in the dam foundation cushion layer at CC in the steel-faced rockfill concrete gravity dam of the present invention; Figure 6 It is a cross-sectional view of the copper water-stop structure at the connection between the steel-faced rockfill concrete section and the dam foundation cushion layer of the present invention; Figure 7 It is a schematic diagram of the plan structure of the stop pit of the steel-faced rockfill concrete gravity dam of the present invention.

[0017] In the figure, 1. dam shoulder section, 2. riverbed dam section, 3. slope, 4. dense mesh, 5. dam shoulder self-compacting concrete layer, 6. dam body steel face plate rockfill concrete layer, 7. dam foundation cushion self-compacting concrete layer, 8. steel face plate, 9. first U-shaped embedded steel bar, 10. embedded steel plate, 11. second U-shaped embedded steel bar, 12. formwork, 13. expansion joint, 14. first copper water stop, 15. first rubber rod, 16. water stop pit, 17. first low-evolution foam board, 18. second copper water stop, 19. second rubber rod, 20. second low-evolution foam board. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The steel-faced rockfill concrete gravity dam of the present invention is as follows: Figure 1As shown, it includes a dam shoulder section 1 and a riverbed section 2. The length of each dam section of the dam shoulder section 1 and the riverbed section 2 is 40~50m. A slope 3 is excavated on the terrain on one side of the dam shoulder section 1. The slope ratio of the slope 3 is 1:m, wherein m is related to the terrain and geological conditions and takes a value of 0.2~3. A water-stop system is arranged between the slope 3 and the dam shoulder section 1. The water-stop system is a conventional copper water-stop sheet and a rubber rod. The structure here belongs to conventional technology and will not be described in detail.

[0020] A fine mesh net 4 is set on the outer side of the dam abutment section 1 at a distance of one meter from the slope 3, and a self-compacting concrete layer 5 of the dam abutment is poured between the slope 3 and the fine mesh net 4. Both the dam abutment section 1 and the riverbed section 2 are composed of a dam body steel face plate rockfill concrete layer 6 and a dam foundation cushion self-compacting concrete layer 7. The thickness of the dam foundation cushion self-compacting concrete layer 7 is 1~2m.

[0021] In the present invention, the slope ratio of the water-facing surface of the dam body steel face rockfill concrete layer 6 is 1:n, and the design is carried out according to the requirements of conventional gravity dams, wherein n is 0-0.8.

[0022] like Figure 2 , 3 As shown, the water-facing surface of the steel panel rockfill concrete layer 6 of the dam body is made of steel panel 8, and the downstream of the steel panel 8 is conventional rockfill concrete. The thickness of the steel panel 8 is 8mm~12mm, and the ends of the two sides of the steel panel 8 are folded into the conventional rockfill concrete downstream, wherein the length folded into the conventional rockfill concrete is not less than 1m, which ensures the reliability. A plurality of first U-shaped embedded steel bars 9 are welded on the downstream side of the steel panel 8, and the plurality of first U-shaped embedded steel bars 9 are cast in the conventional rockfill concrete, wherein the spacing between the first U-shaped embedded steel bars 9 in the structure of the steel panel rockfill concrete layer 6 of the dam body is 600~800mm, arranged in a plum blossom shape, the diameter of the first U-shaped embedded steel bars 9 is 18~25mm, and the total length is 1.3m.

[0023] An embedded steel plate 10 is arranged between the contact part of the self-compacting concrete layer 7 of the dam foundation cushion and the steel panel 8. The embedded steel plate 10 is firmly cast with the self-compacting concrete layer 7 of the dam foundation cushion by using the second U-shaped embedded steel bar 11, and the steel panel 8 and the embedded steel plate 10 are welded; wherein, the spacing of the second U-shaped embedded steel bar 11 is 600mm~800mm, and the second U-shaped embedded steel bar 11 is cast in the self-compacting concrete layer 7 of the dam foundation cushion to ensure reliability.

[0024] A template 12 is provided at the portion where the steel panel 8 is connected to the slope 3 , serving as an upstream template when pouring self-compacting concrete in the gap between the irregular excavation surface of the slope 3 and the regular steel panel 8 .

[0025] An expansion joint 13 is provided between the dam shoulder section 1 and the riverbed section 2. The width of the expansion joint 13 is 1-2 cm. A copper water-stop structure is provided in the expansion joint 13.

[0026] Furthermore, the copper water stop structure includes a first copper water stop sheet 14, a first low-evolution foam board 17, a second copper water stop sheet 18 and a second low-evolution foam board 20, and the first copper water stop sheet 14 and the second copper water stop sheet 18 are welded; like Figure 4 As shown, the first copper water stop 14 and the first low-evolution foam plate 17 are arranged in the expansion joint of the dam body steel panel rockfill concrete layer 6 section, the nose of the first copper water stop 14 faces downstream, the outer side of the nose of the first copper water stop 14 contacts the first low-evolution foam plate 17, the two flanges of the first copper water stop 14 are respectively welded to the steel panel 8, and the first rubber rod 15 is arranged between the noses of the first copper water stop 14.

[0027] like Figure 5 As shown, the second copper water stop 18 and the second low-foam board 20 are arranged in the expansion joint of the self-compacting concrete layer 7 of the dam foundation cushion layer, the nose of the second copper water stop 18 faces downstream, the outer side of the nose of the second copper water stop 18 contacts the second low-foam board 20, and the two flanges of the second copper water stop 18 are buried in the self-compacting concrete layer 7 of the dam foundation cushion layer.

[0028] like Figure 6 As shown, the flanges on both sides of the nose of the first copper water stop 14 are shorter, and the two flanges are respectively welded to the steel panel 8. In the present application, there can also be no flanges. Therefore, the nose opening can be directly welded to the steel panel 8 respectively. This design has a simple structure and consumes less materials. The flanges on both sides of the nose of the second copper water stop 18 are larger than the flanges on both sides of the first copper water stop 14. The flanges on both sides are buried in the self-compacting concrete layer 7 of the dam foundation cushion to ensure reliability. A second rubber rod 19 is arranged between the noses of the second copper water stop 18.

[0029] like Figure 7 As shown, the lower part of the second copper water stop plate 18 in contact with the bedrock is connected and closed by a water stop pit 16 .

[0030] Example 1 The steel face rockfill concrete gravity dam in this embodiment is Figure 1 As shown, the dam includes an abutment dam section 1 and a riverbed dam section 2. A slope 3 is excavated on the terrain on one side of the abutment dam section 1. A dense mesh 4 is set one meter away from the slope 3 on the outside of the abutment dam section 1. A self-compacting concrete layer 5 of the abutment dam section is poured between the slope 3 and the dense mesh 4. The abutment dam section 1 and the riverbed dam section 2 are both composed of a dam body steel face plate rockfill concrete layer 6 and a dam foundation cushion self-compacting concrete layer 7. The water-facing surface of the dam body steel panel rockfill concrete layer 6 adopts a steel panel 8, the thickness of the steel panel 8 is 8mm, the downstream of the steel panel 8 is conventional rockfill concrete, and a plurality of first U-shaped embedded steel bars 9 are welded on the downstream side of the steel panel 8, and the plurality of first U-shaped embedded steel bars 9 are cast in the conventional rockfill concrete; An embedded steel plate 10 is arranged between the contact part of the self-compacting concrete layer 7 of the dam foundation cushion and the steel panel 8. The embedded steel plate is firmly cast with the self-compacting concrete layer 7 of the dam foundation cushion using a second U-shaped embedded steel bar 11. The steel panel 8 and the embedded steel plate 10 are welded. A template 12 is arranged at the connection part between the steel panel 8 and the slope 3. An expansion joint 13 is provided between the dam shoulder section 1 and the riverbed section 2, and a copper water-stop structure is provided in the expansion joint 13.

[0031] Example 2 The steel face rockfill concrete gravity dam in this embodiment is Figure 1 As shown, the dam includes an abutment dam section 1 and a riverbed dam section 2. A slope 3 is excavated on the terrain on one side of the abutment dam section 1. A dense mesh 4 is set one meter away from the slope 3 on the outside of the abutment dam section 1. A self-compacting concrete layer 5 of the abutment dam section is poured between the slope 3 and the dense mesh 4. The abutment dam section 1 and the riverbed dam section 2 are both composed of a dam body steel face plate rockfill concrete layer 6 and a dam foundation cushion self-compacting concrete layer 7. The water-facing surface of the steel panel rockfill concrete layer 6 of the dam body adopts a steel panel 8, the thickness of the steel panel 8 is 10 mm, and the ends of both sides of the steel panel 8 are folded into the conventional rockfill concrete downstream, wherein the length folded into the conventional rockfill concrete is 1.5 m, and the downstream of the steel panel 8 is conventional rockfill concrete. A plurality of first U-shaped embedded steel bars 9 are welded on the downstream side of the steel panel 8, and the plurality of first U-shaped embedded steel bars 9 are cast in the conventional rockfill concrete, wherein the row spacing between the first U-shaped embedded steel bars 9 in the structure of the steel panel rockfill concrete layer 6 of the dam body is 800 mm, arranged in a plum blossom shape, the diameter of the first U-shaped embedded steel bars 9 is 20 mm, and the total length is 1.3 m.

[0032] An embedded steel plate 10 is arranged between the contact part of the self-compacting concrete layer 7 of the dam foundation cushion and the steel panel 8. The embedded steel plate is firmly cast with the self-compacting concrete layer 7 of the dam foundation cushion using a second U-shaped embedded steel bar 11. The steel panel 8 and the embedded steel plate 10 are welded. A template 12 is arranged at the connection part between the steel panel 8 and the slope 3. An expansion joint 13 is provided between the dam shoulder section 1 and the riverbed section 2, and a copper water-stop structure is provided in the expansion joint 13.

[0033] Example 3 The steel face rockfill concrete gravity dam in this embodiment is Figure 1 As shown, the dam includes an abutment dam section 1 and a riverbed dam section 2. A slope 3 is excavated on the terrain on one side of the abutment dam section 1. A dense mesh 4 is set one meter away from the slope 3 on the outside of the abutment dam section 1. A self-compacting concrete layer 5 of the abutment dam section is poured between the slope 3 and the dense mesh 4. The abutment dam section 1 and the riverbed dam section 2 are both composed of a dam body steel face plate rockfill concrete layer 6 and a dam foundation cushion self-compacting concrete layer 7. The water-facing surface of the dam body steel panel rockfill concrete layer 6 adopts a steel panel 8, the thickness of the steel panel 8 is 9 mm, the downstream of the steel panel 8 is conventional rockfill concrete, and a plurality of first U-shaped embedded steel bars 9 are welded on the downstream side of the steel panel 8, and the plurality of first U-shaped embedded steel bars 9 are cast in the conventional rockfill concrete; like Figure 4 As shown, an embedded steel plate 10 is arranged between the contact portion of the self-compacting concrete layer 7 of the dam foundation cushion and the steel panel 8, and the embedded steel plate is firmly cast with the self-compacting concrete layer 7 of the dam foundation cushion using a second U-shaped embedded steel bar 11, and the steel panel 8 and the embedded steel plate 10 are welded; wherein, the spacing between the second U-shaped embedded steel bars 11 is 600mm, and the second U-shaped embedded steel bars 11 are cast in the self-compacting concrete layer 7 of the dam foundation cushion to ensure reliability.

[0034] An expansion joint 13 is provided between the dam shoulder section 1 and the riverbed section 2, and a copper water-stop structure is provided in the expansion joint 13.

[0035] Example 4 On the basis of the structure of Example 3, in this example, the design is carried out in accordance with the requirements of conventional gravity dams, and the slope ratio of the water-facing surface of the dam body steel face rockfill concrete layer 6 is 1:0.6.

[0036] Example 5 On the basis of Example 1, the thickness of the steel panel 8 of this example is changed to 12 mm, and the rest of the structure is the same as that of Example 1.

[0037] Example 6 Based on the structure of Example 1, the copper water stop structure of this embodiment includes a first copper water stop sheet 14, a first low-foam plate 17, a second copper water stop sheet 18 and a second low-foam plate 20, and the first copper water stop sheet 14 and the second copper water stop sheet 18 are welded; like Figure 4 As shown, the first copper water stop 14 and the first low-evolution foam plate 17 are arranged in the expansion joint of the dam body steel panel rockfill concrete layer 6 section, the nose of the first copper water stop 14 faces downstream, the outer side of the nose of the first copper water stop 14 contacts the first low-evolution foam plate 17, the two flanges of the first copper water stop 14 are respectively welded to the steel panel 8, and the first rubber rod 15 is arranged between the noses of the first copper water stop 14.

[0038] like Figure 5 As shown, the second copper water stop 18 and the second low-foam board 20 are arranged in the expansion joint of the self-compacting concrete layer 7 of the dam foundation cushion layer, the nose of the second copper water stop 18 faces downstream, the outer side of the nose of the second copper water stop 18 contacts the second low-foam board 20, and the two flanges of the second copper water stop 18 are buried in the self-compacting concrete layer 7 of the dam foundation cushion layer.

[0039] like Figure 6As shown, the flange lengths on both sides of the nose of the first copper water stop 14 are very short. In the present application, it can be considered that the first copper water stop 14 has no flanges on both sides, and the nose opening can be directly welded to the steel panel 8 respectively, with a simple structure and less consumables; the flanges on both sides of the nose of the second copper water stop 18 are larger than the flanges on both sides of the first copper water stop 14, and the flanges on both sides are buried in the self-compacting concrete layer 7 of the dam foundation cushion to ensure reliability.

[0040] like Figure 7 As shown, the lower part of the second copper water stop plate 18 in contact with the bedrock is connected and closed by a water stop pit 16 .

Claims

1. Steel-faced rockfill concrete gravity dam, characterized in that: The invention comprises a dam shoulder section (1) and a riverbed section (2), a side slope (3) is excavated on the terrain on one side of the dam shoulder section (1), a fine mesh net (4) is arranged on the outer side of the dam shoulder section (1) at a distance of one meter from the side slope (3), and a dam shoulder self-compacting concrete layer (5) is poured between the side slope (3) and the fine mesh net (4), wherein the dam shoulder section (1) and the riverbed section (2) are both composed of a dam body steel face plate rockfill concrete layer (6) and a dam foundation cushion self-compacting concrete layer (7); The water-facing surface of the dam body steel panel rockfill concrete layer (6) is made of a steel panel (8), the downstream of the steel panel (8) is conventional rockfill concrete, a plurality of first U-shaped embedded steel bars (9) are welded on the downstream side of the steel panel (8), and the plurality of first U-shaped embedded steel bars (9) are cast in the conventional rockfill concrete; An embedded steel plate (10) is provided between the contact portion of the self-compacting concrete layer (7) of the dam foundation cushion and the steel panel (8); the embedded steel plate (10) is firmly cast with the self-compacting concrete layer (7) of the dam foundation cushion using a second U-shaped embedded steel bar (11); the steel panel (8) and the embedded steel plate (10) are welded; a template (12) is provided at the portion where the steel panel (8) is connected to the slope (3); An expansion joint (13) is provided between the dam shoulder section (1) and the riverbed section (2), and a copper water-stopping structure is provided in the expansion joint (13).

2. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: A water stop system is provided between the side slope (3) and the dam abutment section (1).

3. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The dam shoulder section (1) and the riverbed section (2) are both 40 to 50 m long.

4. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The slope ratio of the side slope (3) is 1:m, wherein m is between 0.2 and 3.

5. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The spacing between the first U-shaped embedded steel bars (9) in the dam body steel face plate rockfill concrete layer (6) is 600-800 mm, arranged in a plum blossom shape, the first U-shaped embedded steel bars (9) have a diameter of 18-25 mm, and a total length of 1.3 m.

6. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The thickness of the dam foundation cushion self-compacting concrete layer (7) is 1-2 m, and the spacing between the second U-shaped embedded steel bars (11) is 600 mm-800 mm.

7. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The water-facing surface slope ratio of the dam body steel face rockfill concrete layer (6) is 1:n, where n is between 0 and 0.

8.

8. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The thickness of the steel panel (8) is 8 mm to 12 mm, and the ends of both sides of the steel panel (8) are folded into the conventional rockfill concrete downstream, wherein the length folded into the conventional rockfill concrete is not less than 1 m.

9. The steel-faced rockfill concrete gravity dam according to claim 1, characterized in that: The expansion joint (13) has a width of 1 to 2 cm.

10. The steel-faced rockfill concrete gravity dam according to claim 9, characterized in that: The copper water-stop structure comprises a first copper water-stop sheet (14), a first low-foam plate (17), a second copper water-stop sheet (18) and a second low-foam plate (20), wherein the first copper water-stop sheet (14) and the second copper water-stop sheet (18) are welded; The first copper water stop sheet (14) and the first low-evolution foam plate (17) are arranged in the expansion joint of the dam body steel panel rockfill concrete layer (6) section, the nose of the first copper water stop sheet (14) faces downstream, the outer side of the nose of the first copper water stop sheet (14) contacts the first low-evolution foam plate (17), the two flanges of the first copper water stop sheet (14) are respectively welded to the steel panel (8), and a first rubber rod (15) is arranged between the noses of the first copper water stop sheet (14); The second copper water stop sheet (18) and the second low-foam plate (20) are arranged in the expansion joint of the self-compacting concrete layer (7) of the dam foundation cushion layer, the nose of the second copper water stop sheet (18) faces downstream, the outer side of the nose of the second copper water stop sheet (18) contacts the second low-foam plate (20), the two flanges of the second copper water stop sheet (18) are buried in the self-compacting concrete layer (7) of the dam foundation cushion layer, and a second rubber rod (19) is arranged between the noses of the second copper water stop sheet (18); the contact portion between the lower part of the second copper water stop sheet (18) and the bedrock is connected and sealed via a water stop pit (16).

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