Rock-fill dam panel seam surface water stop structure

Abstract

The utility model discloses a rock-fill dam panel seam surface water stop structure which comprises a first concrete panel and a second concrete panel, a structural seam is arranged between the first concrete panel and the second concrete panel, plastic filler is filled on the structural seam, a first water stop film is covered on the plastic filler, and a second water stop film is covered on the second concrete panel. Water stop pieces are embedded in the first concrete face plate and the second concrete face plate respectively, one end of each water stop piece extends out of the face plate and is in lap joint with a second water stop film and a third water stop film, and the second water stop film and the upper surface of the water stop pieces form a whole through extrusion fusion. The third water stop film and the lower surface of the water stop piece are extruded and fused to form a whole, and the first water stop film, the second water stop film and the third water stop film are welded in a hot melting mode to form a whole. The sealing device is good in stress performance, good in water stopping effect, good in sealing effect and high in safety performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to a seepage prevention structure of hydraulic and hydroelectric engineering, in particular to a rockfill dam face plate joint surface water stop structure. BACKGROUND

[0002] In the construction of the reservoir using the concrete face rockfill dam, the water stop structure is usually arranged between the inter-plate joints (the structural joints between the face plates) and the peripheral joints (the structural joints between the face plates and the toe plates) for seepage prevention, and the connection part of the inter-plate joints and the peripheral joints is the key part of the seepage prevention force. Once the seepage occurs, the operation and maintenance are inconvenient, and the dam safety is seriously threatened. Therefore, the connection and sealing problems of the water stop structure of the inter-plate joints and the peripheral joints must be solved.

[0003] The existing connection water stop of the inter-plate joints and the peripheral joints of the rockfill dam usually adopts the two independent seepage prevention water stop systems of the bottom copper water stop + surface water stop as shown in Chinese patent CN118309018A. This method is more used in the seepage prevention of water conservancy projects (such as reservoirs) and hydropower projects (face plate rockfill dams). At present, the surface water stop is directly across the inter-plate joints by the cover plate (usually made of rubber material), and the two ends of the cover plate are fixed on the surfaces of the two face plates on the left and right of the inter-plate joints and the two face plates and the toe plates on the two sides of the peripheral joints, respectively. Then, the strip-shaped flat steel pressing strip with holes is used to press the two side edges of the cover plate, and the flat steel pressing strip is fixed on the concrete surface by bolts to form anchoring and fixing, thereby forming fixed sealing. This surface water stop technology using physical anchoring type for connection and anchoring on the face plate or the toe plate has the following problems:

[0004] The strip-shaped flat steel pressing strip is used to press the cover plate, and the flat steel pressing strip is fixed on the concrete surface by bolts. Firstly, the surface of the concrete face plate is continuously and intermittently holed, which will damage the structure of the concrete surface and weaken the local strength of the concrete structure, which is not conducive to the stress of the concrete structure. Secondly, because the size of the face plate along the slope is large, the rigidity of the strip-shaped flat steel pressing strip is relatively small, and the hole spacing of the flat steel pressing strip is usually 30-60 cm. When the flat steel pressing strip is fixed by bolts, the flat steel pressing strip will appear convex between the bolts, cannot tightly press the cover plate, and the farther away from the bolt, the more convex the flat steel pressing strip appears, which is easy to cause gap seepage. Thirdly, due to the influence of the flatness of the concrete face plate, the face plate is not a plane, and there is always concave and convex. The cover plate cannot be sealed by the flat steel pressing. Fourthly, the concrete face plate will be deflected and deformed under the action of the dam body deformation or water pressure, and the flat steel pressing strip and the surface of the face plate will form a void phenomenon. When the void is serious, the bolts will be damaged, forming a direct seepage channel, and the surface water stop is virtual. Fifthly, the bolts fixed on the concrete surface by later punching are also seepage channels between the bolts and the concrete, especially under high water pressure, which will easily form around-hole seepage and cannot realize sealing.

[0005] In recent years, with the rapid development of hydropower development, especially the wide application of pumped storage power station construction, the face slab rockfill dam is used a lot. Meanwhile, according to the actual needs of the project, the face slab rockfill dam made of local materials has good adaptability and economy in the pumped storage power station, and becomes the preferred choice. However, the surface sealing type between the panel dam plate joints and the peripheral joints has poor connection and sealing effect, which is one of the main problems in the project. The sealing failure often occurs during construction and operation, and often needs to be repaired, which has adverse effects on the safety and operation of the project. Practical new type content

[0006] The technical problem solved by the utility model is that, in view of the deficiencies of the surface sealing and anti-seepage structure of the inter-plate joint and the peripheral joint of the rockfill dam, the utility model provides a rockfill dam face plate joint surface sealing structure which has good stress performance, good sealing effect, good sealing effect and high safety performance.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] A rockfill dam face plate joint surface sealing structure, comprising a first concrete panel and a second concrete panel, the first concrete panel and the second concrete panel have a structural joint therebetween, the structural joint is filled with a plastic filler, and the plastic filler is covered with a first sealing film, and the structural features are that:

[0009] A sealing piece is embedded in the first concrete panel and the second concrete panel respectively, one end of the sealing piece extends out of the panel and overlaps a second sealing film and a third sealing film, the second sealing film and the upper surface of the sealing piece are integrally formed by extrusion fusion, the third sealing film and the lower surface of the sealing piece are integrally formed by extrusion fusion, and the first sealing film, the second sealing film and the third sealing film are integrally formed by hot melt welding.

[0010] It should be noted that the first concrete panel and the second concrete panel in this paper can be the face plate or the toe plate of the rockfill dam, and the structural joint referred to in this paper includes the inter-plate joint between the face plate and the face plate, and the peripheral joint between the face plate and the toe plate.

[0011] Further, a plurality of connecting through holes are arranged at the panel extending end of the sealing piece, the upper surface of the connecting through hole is covered with the second sealing film, the lower surface is covered with the third sealing film, and the second sealing film and the third sealing film on the upper and lower surfaces of the connecting through hole and the second sealing film and the third sealing film outside the sealing piece are integrally formed by hot melt welding.

[0012] Further, the overlapping length of the sealing piece and the second sealing film and the third sealing film is 10-20 cm.

[0013] Further, the water stop piece comprises a horizontal section, a vertical section and a hook section connected in sequence, and the horizontal section, the vertical section and the hook section are connected to form a right-angle hook shape, and the hook section extends out of the face plate.

[0014] Further, a water stop rod is placed on the top of the structural joint.

[0015] Further, the water stop rod is made of PVC material.

[0016] Further, the water stop rod has a diameter of 3-5 cm.

[0017] Further, the water stop piece is made of red copper.

[0018] Further, the plastic filler is filled in a drum shape, and the plastic filler protrudes from the surfaces of the first concrete face plate and the second concrete face plate by a certain height.

[0019] Further, the top of the structural joint is formed as a V-shaped notch, the water stop rod is placed at the bottom of the V-shaped notch, the V-shaped notch is filled with the plastic filler, the plastic filler is filled in a drum shape and protrudes from the surfaces of the first concrete face plate and the second concrete face plate by a certain height.

[0020] Further, the plurality of connecting through holes are distributed in a quincunx shape or an equilateral triangle shape.

[0021] Based on the same inventive concept, the utility model also provides a construction method of the water stop structure of the rock-fill dam face plate joint, which comprises the following steps:

[0022] Before the first concrete face plate and the second concrete face plate are poured, the second water stop film is overlapped on the upper surface of the extended face plate end of the water stop piece, the third water stop film is overlapped on the lower surface of the extended face plate end of the water stop piece, and the upper surface of the extended face plate end of the water stop piece is extruded and fused with the second water stop film to form an integral whole, and the lower surface of the extended face plate end of the water stop piece is extruded and fused with the third water stop film to form an integral whole, and the second water stop film and the third water stop film are formed as an integral whole through hot melting welding;

[0023] When the first concrete face plate and the second concrete face plate are poured, the water stop piece is pre-buried in the first concrete face plate and the second concrete face plate respectively, so that the lower end of the water stop piece is formed as an integral whole with the concrete, and the extended face plate end of the water stop piece is exposed;

[0024] After the first concrete face plate and the second concrete face plate are poured, the plastic filler with a certain modulus is first filled on the top of the structural joint, then the first water stop film is used to cover the plastic filler on the structural joint, and the first water stop film and the second water stop film fused on the water stop piece are formed as an integral whole through hot melting welding.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] 1) the utility model discloses a sealing anti -infiltration system of the integral sealing of water stop piece, water stop membrane and concrete panel (first concrete panel and second concrete panel) is formed, guarantees the surface water stop effect of the structural joint between first concrete panel and second concrete panel.

[0027] 2) the utility model discloses embedding water stop piece in the concrete of first concrete panel and second concrete panel, makes the water stop piece periphery can realize complete sealing water stop effect, simultaneously adopts the blowing film extrusion process and forms the sealing whole with the geotextile abdominal complex on water stop piece, has improved the water stop effect between both.

[0028] 3) the utility model discloses that first water stop membrane covers structural joint, and first water stop membrane and the second water stop membrane of reserving on water stop piece are hot melt welded, replaces the bolt anchoring connection method used in traditional method, to realize the complete sealing between water stop piece and first water stop membrane, has greatly improved the anti -infiltration effect of surface water stop, has improved the security of dam. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is some embodiments of the utility model, and for ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0030] Figure 1 It is the structural schematic diagram of the utility model.

[0031] Figure 2 It is the structural schematic diagram of water stop piece.

[0032] Figure 3 It is the lap joint schematic diagram of water stop piece and second water stop membrane.

[0033] Figure 4 It is the lap joint schematic diagram of water stop piece and third water stop membrane.

[0034] Figure 5 It is the lap joint state schematic diagram of water stop piece and second, third water stop membrane.

[0035] In the drawing: 1. first concrete panel, 2. structural joint, 3. water stop rod, 4. water stop piece, 5. second water stop membrane, 6. third water stop membrane, 7. plastic filler, 8. first water stop membrane, 9. connecting through hole, 10. second concrete panel. DETAILED DESCRIPTION

[0036] The utility model will be further described below in combination with specific preferred embodiments, but it is not limited to the protection scope of the utility model.

[0037] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] Please refer to Figure 1 - Figure 5 The utility model rockfill dam panel seam surface water stop structure one embodiment includes first concrete panel 1 and second concrete panel 10, and the first concrete panel 1 and the second concrete panel 10 have structural joint 2 between them. The first concrete panel 1 and the second concrete panel 10 are respectively embedded with water stop piece 4, one end of the water stop piece 4 extends out of the concrete panel, and overlaps second water stop film 5 and third water stop film 6, the second water stop film 5 and the upper surface of the water stop piece 4 are integrally formed by extrusion fusion, and the third water stop film 6 and the lower surface of the water stop piece 4 are integrally formed by extrusion fusion. The top of the structural joint 2 is filled with plastic filler 7, the plastic filler 7 is covered with first water stop film 8, and the first water stop film 8, second water stop film 5 and third water stop film 6 are integrally formed by hot melt welding.

[0040] To further improve the connection sealing performance of the water stop sheet 4 and the second water stop film 5 and the third water stop film 6, the protruding panel end of the water stop sheet 4 is provided with a plurality of connection through holes 9, the upper surface of the connection through hole 9 covers the second water stop film 5, the lower surface covers the third water stop film 6, and the second water stop film 5 and the third water stop film 6 on the upper and lower surfaces of the connection through hole 9 and the second water stop film 5 and the third water stop film 6 outside the water stop sheet 4 are integrally welded by hot melting. To ensure that the second water stop film 5 and the third water stop film 6 on the upper and lower surfaces of the water stop sheet 4 can be continuously hot-melted and integrated, the plurality of connection through holes 9 are distributed in a plum blossom shape or a regular triangle shape.

[0041] The water stop sheet 4 is preferably a copper water stop sheet. The thickness of the water stop sheet 4 is generally 0.8-1.2mm. The thickness of the first water stop film 8, the second water stop film 5 and the third water stop film 6 is generally 0.8-2.0mm. The overlap length of the water stop sheet 4 and the second water stop film 5 and the third water stop film 6 is 10-20cm.

[0042] To ensure that the water stop sheet 4 is firmly poured with the concrete panel (panel or toe plate), and at the same time prevent the seepage around the contact surface of the water stop sheet 4 and the concrete under high water head, as shown in the figure, the water stop sheet 4 comprises a horizontal section 41, a vertical section 42 and a hook body section 43 connected in sequence, and the horizontal section 41, the vertical section 42 and the hook body section 43 are connected to form a right-angle hook shape, the length of the horizontal section 41 can be selected as 5-10cm as required, and the hook body section 43 protrudes from the concrete panel. Figure 2

[0043] The water stop film in the embodiment is preferably a geomembrane that can be used for hot-melt connection, or a rubber film, or a composite TPO film and a TPO geomembrane.

[0044] The construction method of the rock-fill dam panel joint surface water stop structure comprises the following steps: before pouring the first concrete panel 1 and the second concrete panel 10, firstly, the upper surface of the water stop sheet 4 and the second water stop film 5 are extrusion-combined at the overlap part, the overlap part is fused to form a whole, then the lower surface of the water stop sheet 4 and the third water stop film 6 are extrusion-combined to form a whole, then the second water stop film 5 and the third water stop film 6 are welded together at the position of the connection through hole 9 of the water stop sheet 4 by hot melting, so that the water stop sheet 4 and the second water stop film 5 and the third water stop film 6 are tightly fixed, and finally the second water stop film 5 and the third water stop film 6 outside the water stop sheet 4 are welded by hot melting to form a whole.

[0045] When pouring the first concrete panel 1 and the second concrete panel 10, the water stop sheet 4 is embedded in the first concrete panel 1 and the second concrete panel 10 respectively, so that the lower end of the water stop sheet 4 is integrated with the concrete, and the protruding panel end (hook body section 43) of the water stop sheet 4 is exposed. ​

[0046] After the first concrete panel 1 and the second concrete panel 10 are cast, a PVC rod 3 is placed on top of the structural joint 2, the PVC rod 3 has a certain modulus of elasticity, avoiding that the plastic filler 7 is pressed into the gap of the structural joint 2 under high water pressure. The diameter of the PVC rod 3 is according to actual needs, generally 3-5 cm; then the plastic filler 7 with a certain modulus is filled in the "V" shaped notch on top of the structural joint 2, the plastic filler 7 is made into a bulge shape, protruding from the surface of the first concrete panel 1 and the second concrete panel 10 by a certain height, preventing the plastic filler 7 from being extruded and collapsed into the structural joint 2 under high water head; finally, the first water stop film 8 and the second water stop film 5 fused on the water stop sheet 4 are welded by hot melting to form a sealed whole.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art, without departing from the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed technical content, or modify it into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall fall within the protection scope of the technical scheme of the present application.

Claims

1. A rockfill dam panel joint surface sealing structure, comprising a first concrete panel and a second concrete panel, having a structural joint between the first concrete panel and the second concrete panel, the structural joint being filled with a plastic filler, the plastic filler being covered with a first sealing membrane, characterized in that: a sealing piece is embedded in the first concrete panel and the second concrete panel respectively, one end of the sealing piece extending out of the panel and overlapping a second sealing membrane and a third sealing membrane, the second sealing membrane being fused with the upper surface of the sealing piece to form a whole by extrusion, the third sealing membrane being fused with the lower surface of the sealing piece to form a whole by extrusion, and the first sealing membrane, the second sealing membrane and the third sealing membrane being fused to form a whole by hot melting welding.

2. The rockfill dam panel joint surface sealing structure according to claim 1, characterized in that, a plurality of connecting through holes are arranged on the end of the sealing piece extending out of the panel, the upper surface of the connecting through holes being covered with the second sealing membrane, the lower surface of the connecting through holes being covered with the third sealing membrane, and the second sealing membrane and the third sealing membrane on the upper and lower surfaces of the connecting through holes and the second sealing membrane and the third sealing membrane outside the sealing piece being fused to form a whole by hot melting welding respectively.

3. The rockfill dam panel joint surface waterstop structure according to claim 1, wherein, The overlapping length of the sealing piece with the second sealing membrane and the third sealing membrane is 10-20 cm.

4. The rockfill dam panel joint surface waterstop structure according to claim 1, wherein, The sealing piece comprises a horizontal section, a vertical section and a hook body section connected in sequence, and the horizontal section, the vertical section and the hook body section are connected to form a right-angle hook shape, and the hook body section extends out of the panel.

5. The rockfill dam panel joint surface stop water structure according to claim 1, characterized in that, A sealing rod is placed on the top of the structural joint.

6. The rockfill dam panel joint surface stop water structure according to claim 5, characterized in that, The sealing rod is made of PVC material, and the diameter of the sealing rod is 3-5 cm.

7. The rockfill dam panel joint surface stop water structure according to claim 1, characterized in that, The sealing piece is made of red copper.

8. The rockfill dam panel joint surface stop water structure according to claim 1, characterized in that, The plastic filler is filled to form a bulge, and the plastic filler protrudes from the surface of the first concrete panel and the second concrete panel by a certain height.

9. The rockfill dam panel joint surface waterstop structure according to claim 1, wherein, The top of the structural joint forms a V-shaped notch, the sealing rod is placed at the bottom of the V-shaped notch, the plastic filler is filled in the V-shaped notch, the plastic filler is filled to form a bulge, and the plastic filler protrudes from the surface of the first concrete panel and the second concrete panel by a certain height.

10. The rockfill dam panel joint surface stop water structure according to claim 2, characterized in that, The plurality of connecting through holes are distributed in a plum blossom shape or an equilateral triangle shape.

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