Joint structure and method between impervious wall and connecting plate of concrete face dam

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a joint structure and method between a concrete face dam diaphragm wall and a connecting plate. A joint structure between a concrete face dam diaphragm wall and a connecting plate comprises a step type joint located at the connecting position of the concrete diaphragm wall and the concrete connecting plate, a filling layer is arranged in the step type joint, the step type joint comprises a first connecting section, a second connecting section and a third connecting section from top to bottom, and the first connecting section, the second connecting section and the third connecting section are sequentially connected. The first connecting section and the third connecting section are both arranged perpendicular to the horizontal plane, and the second connecting section is arranged in an inclined mode relative to the horizontal plane. The stepped joint structure is arranged between the anti-seepage wall and the connecting plate, so that the settlement deformation difference between the concrete anti-seepage wall and the concrete connecting plate can be reduced, and the deformation safety of the joint part is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a joint structure and method between an anti-seepage wall and a connecting plate of a concrete panel dam. Background Art

[0002] A concrete face dam is a rockfill dam that uses a rockfill body as its supporting structure and casts a concrete face plate on its upstream surface as an anti-seepage structure. It is referred to as a face rockfill dam or face dam.

[0003] Concrete panel dam built on the overburden layer, vertical concrete anti-seepage wall is used for anti-seepage in the overburden layer, and concrete connecting plate is generally used to connect the top of concrete anti-seepage wall with the horizontal toe plate of panel rockfill dam, and vertical seams are used for joints. As the height of concrete panel dam increases, the effective water head on the concrete connecting plate also increases accordingly. The concrete anti-seepage wall is a rigid structure with small vertical deformation at the top, while the concrete connecting plate located on the overburden layer settles and moves along the vertical joint due to the weak foundation of the overburden layer, resulting in a large settlement deformation difference in the vertical joint between the top of the concrete anti-seepage wall and the horizontal concrete connecting plate, affecting the anti-seepage safety of concrete panel dam on the overburden layer. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide a joint structure and method between the anti-seepage wall and the connecting plate of a concrete panel dam. By setting a stepped joint structure between the anti-seepage wall and the connecting plate, the settlement deformation difference between the concrete anti-seepage wall and the concrete connecting plate can be reduced, thereby improving the deformation safety of the joint part.

[0005] The technical solution of the present invention is: a joint structure between an anti-seepage wall and a connecting plate of a concrete panel dam, comprising a stepped joint located at the connection between the concrete anti-seepage wall and the concrete connecting plate, wherein a filling layer is provided in the stepped joint, and wherein the stepped joint comprises a first connecting section, a second connecting section and a third connecting section connected in sequence from top to bottom, wherein the first connecting section and the third connecting section are both arranged perpendicularly to a horizontal plane, and the second connecting section is arranged obliquely to the horizontal plane.

[0006] The height H1 of the first connecting section is 0.2m-0.5m, the height H2 of the third connecting section is 0.2m-0.5m, the horizontal projection width B1 of the second connecting section is 0.2m-0.5m, and the angle α between the second connecting section and the horizontal plane is 30°-60°.

[0007] The higher side of the second connecting section faces the concrete cut-off wall.

[0008] The seam width B2 of the stepped seam is 20 mm to 40 mm.

[0009] The filling material in the filling layer is a synthetic rubber plate, the thickness of the synthetic rubber plate is 20 mm to 40 mm, and the saturated compression modulus is not less than 50 MPa.

[0010] A method for joining a concrete face dam impermeable wall and a connecting plate, using the above-mentioned joint structure between the concrete face dam impermeable wall and the connecting plate, comprises the following steps: S1: First, the top 1m to 2m of the concrete of the slotted concrete of the concrete anti-seepage wall in the cover layer is chiseled off, and the first connecting section, the second connecting section and the third connecting section are cast in place in sequence to form a stepped structure at the top of the concrete anti-seepage wall; S2: Paste a synthetic rubber sheet on the stepped structure at the top of the concrete anti-seepage wall to form a filling layer; S3: Cast a concrete connecting plate on the filling layer to complete the connection between the concrete anti-seepage wall and the concrete connecting plate.

[0011] The technical effects of the present invention are as follows: 1. By arranging a step-type joint structure between the anti-seepage wall and the connecting plate, the top of the concrete anti-seepage wall is designed with a slope-type step. Under the action of the upper water load, the contact part of the concrete connecting plate with the anti-seepage wall can be displaced along the slope, that is, the settlement deformation is decomposed into horizontal deformation and vertical deformation, the settlement deformation of the joint is reduced, and the deformation safety of the joint is improved; 2. The step-type joint structure of the present invention is filled with a synthetic rubber plate with a certain thickness and compression strength, which can prevent the concrete structure at the slope of the step-type joint from being squeezed and damaged; 3. Compared with the original vertical joint structure of the concrete anti-seepage wall and the concrete connecting plate, the step-type joint structure of the present invention has universal construction equipment, does not add additional construction technology, can reduce the settlement deformation relative to the vertical joint by 20% to 50%, and has low cost.

[0012] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic structural diagram of a joint structure between an anti-seepage wall and a connecting plate of a concrete panel dam according to an embodiment of the present invention.

[0014] Figure numerals: 1 - concrete anti-seepage wall; 2 - concrete connecting plate; 3 - stepped joint; 4 - filling layer; 31 - first connecting section; 32 - second connecting section; 33 - third connecting section. DETAILED DESCRIPTION Example 1

[0015] like Figure 1As shown, a joint structure between an anti-seepage wall and a connecting plate of a concrete panel dam includes a stepped joint 3 located at the connection between a concrete anti-seepage wall 1 and a concrete connecting plate 2, wherein a filling layer 4 is provided in the stepped joint 3, and wherein the stepped joint 3 includes a first connecting section 31, a second connecting section 32 and a third connecting section 33 which are connected in sequence from top to bottom, wherein the first connecting section 31 and the third connecting section 33 are both arranged perpendicular to a horizontal plane, and the second connecting section 32 is arranged obliquely to the horizontal plane.

[0016] During actual use, the step-type joint 3 of the present invention includes a first connecting section 31, a second connecting section 32 and a third connecting section 33 connected in sequence from top to bottom. The first connecting section 31 and the third connecting section 33 are both arranged perpendicular to the horizontal plane, and the second connecting section 32 is arranged inclined to the horizontal plane. The present invention arranges a step-type joint structure between the anti-seepage wall and the connecting plate, and adopts a sloped step design for the top of the concrete anti-seepage wall. The contact part of the concrete connecting plate with the anti-seepage wall under the action of the upper water load can be displaced along the slope, that is, the settlement deformation is decomposed into horizontal deformation and vertical deformation, thereby reducing the settlement deformation of the joint and improving the deformation safety of the joint. Example 2

[0017] Preferably, on the basis of Example 1, in this embodiment, the height H1 of the first connecting section 31 is 0.2m~0.5m, the height H2 of the third connecting section 33 is 0.2m~0.5m, the horizontal projection width B1 of the second connecting section 32 is 0.2m~0.5m, and the angle α between the second connecting section 32 and the horizontal plane is 30°~60°.

[0018] During actual use, the height H1 of the first connecting section 31 of the present invention is 0.2m~0.5m, the height H2 of the third connecting section 33 is 0.2m~0.5m, the horizontal projection width B1 of the second connecting section 32 is 0.2m~0.5m, and the angle α between the second connecting section 32 and the horizontal plane is 30°~60°. By arranging a step-type joint structure between the anti-seepage wall and the connecting plate, the top of the concrete anti-seepage wall adopts a sloped step design. The contact part of the concrete connecting plate with the anti-seepage wall under the action of the upper water load can be displaced along the slope, that is, the settlement deformation is decomposed into horizontal deformation and vertical deformation, thereby reducing the settlement deformation of the joint and improving the deformation safety of the joint. Example 3

[0019] Preferably, on the basis of Example 1 or Example 2, in this embodiment, the higher side of the second connecting section 32 faces the concrete cut-off wall 1 .

[0020] During actual use, the higher side of the second connecting section 32 of the present invention faces the concrete anti-seepage wall 1, which is convenient for adopting a sloped step design on the top of the concrete anti-seepage wall. The contact part of the concrete connecting plate with the anti-seepage wall can be displaced along the slope under the action of the upper water load, that is, the settlement deformation is decomposed into horizontal deformation and vertical deformation. Example 4

[0021] Preferably, on the basis of Embodiment 1, in this embodiment, the seam width B2 of the stepped seam 3 is 20 mm to 40 mm.

[0022] In actual use, the width B2 of the step-type joint 3 of the present invention is 20 mm to 40 mm, which is used for filling the filling layer and can prevent the concrete structure at the slope of the step-type joint from being squeezed and damaged. Example 5

[0023] Preferably, based on Example 1 or Example 4, in this embodiment, the filling material in the filling layer 4 is a synthetic rubber plate, the thickness of the synthetic rubber plate is 20 mm to 40 mm, and the saturated compression modulus thereof is not less than 50 MPa.

[0024] During actual use, the filling material in the filling layer 4 of the present invention is a synthetic rubber plate, the thickness of the synthetic rubber plate is 20mm~40mm, and the saturated compression modulus is not less than 50MPa. The synthetic rubber plate with a certain thickness and compression strength is filled in the step-type joint structure to prevent the concrete structure at the slope of the step-type joint from being squeezed and damaged. Example 6

[0025] A method for joining a concrete face dam impermeable wall and a connecting plate, using the above-mentioned joint structure between the concrete face dam impermeable wall and the connecting plate, comprises the following steps: S1: First, the top 1m to 2m of the concrete of the slotted concrete cut-off wall 1 in the cover layer is chiseled off, and the first connecting section 31, the second connecting section 32 and the third connecting section 33 are cast in place in sequence to form a stepped structure at the top of the concrete cut-off wall; S2: Paste a synthetic rubber sheet on the stepped structure at the top of the concrete anti-seepage wall to form a filling layer 4; S3: pouring a concrete connecting plate 2 on the filling layer 4 to complete the connection between the concrete anti-seepage wall 1 and the concrete connecting plate 2.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A joint structure between a concrete face dam anti-seepage wall and a connecting plate, Features: The invention comprises a stepped joint (3) located at the connection between a concrete anti-seepage wall (1) and a concrete connecting plate (2), wherein a filling layer (4) is provided in the stepped joint (3), and the stepped joint (3) comprises a first connecting section (31), a second connecting section (32) and a third connecting section (33) which are connected in sequence from top to bottom, wherein the first connecting section (31) and the third connecting section (33) are both arranged perpendicular to a horizontal plane, and the second connecting section (32) is arranged obliquely to the horizontal plane.

2. The joint structure between the anti-seepage wall and the connecting plate of a concrete panel dam according to claim 1, Features: The height H1 of the first connecting section (31) is 0.2 m to 0.5 m, the height H2 of the third connecting section (33) is 0.2 m to 0.5 m, the horizontal projection width B1 of the second connecting section (32) is 0.2 m to 0.5 m, and the angle α between the second connecting section (32) and the horizontal plane is 30° to 60°.

3. The joint structure between the anti-seepage wall and the connecting plate of a concrete panel dam according to claim 1, Features: The higher side of the second connecting section (32) faces the concrete anti-seepage wall (1).

4. The joint structure between the anti-seepage wall and the connecting plate of a concrete panel dam according to claim 1, Features: The seam width B2 of the stepped seam (3) is 20 mm to 40 mm.

5. The joint structure between the anti-seepage wall and the connecting plate of a concrete panel dam according to claim 1, Features: The filling material in the filling layer (4) is a synthetic rubber sheet, the thickness of the synthetic rubber sheet is 20 mm to 40 mm, and the saturated compression modulus is not less than 50 MPa.

6. A method for joining a concrete face dam cut-off wall and a connecting plate, using the joint structure between a concrete face dam cut-off wall and a connecting plate as claimed in claim 1, Features: The following steps are involved: S1: First, the top 1m to 2m of the concrete cast in the slot of the concrete anti-seepage wall (1) in the cover layer is chiseled off, and the first connecting section (31), the second connecting section (32) and the third connecting section (33) are cast in place in sequence to form a stepped structure at the top of the concrete anti-seepage wall; S2: Paste a synthetic rubber sheet on the stepped structure at the top of the concrete anti-seepage wall to form a filling layer (4); S3: pouring a concrete connecting plate (2) on the filling layer (4) to complete the connection between the concrete anti-seepage wall (1) and the concrete connecting plate (2).

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