Anchoring lap joint structure for geomembranes with different bending directions and construction method

Abstract

The anchoring lap joint structure comprises an anchoring belt, geomembranes, bolts, angle steel and nuts, the anchoring belt is arranged on the surface of concrete, more than two groups of geomembranes are arranged on the anchoring belt, the geomembranes are bent towards different directions, the angle steel is arranged on the geomembranes, the bolts penetrate through the angle steel, the geomembranes and the anchoring belt to be inserted into the concrete, and the nuts are arranged on the anchoring belt. The geomembranes bent in different directions are connected in a welded mode through a welding machine, first welding seams are formed in the connecting positions of the geomembranes, the positions, close to the ends of the anchoring belts, of the geomembranes are connected with the anchoring belts in a welded mode through a manual welding gun, and second welding seams are formed in the connecting positions of the geomembranes and the anchoring belts. The geomembranes bent in different directions and the anchoring belts are connected into a whole through welding, gaps are prevented from being formed between the geomembranes, the geomembranes and the concrete are anchored together through the anchoring belts, the angle steel and the bolts, and the integrity and reliability of the dam geomembrane anti-seepage structure are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower, and in particular to an anchoring overlap structure for geomembranes in different bending directions and a construction method. Background Art

[0002] Core dams are widely used in water conservancy and hydropower projects. However, due to climatic conditions, the core material often has a high moisture content and lacks sufficient sunlight to dry it. Alternatively, due to material sourcing, the particle size cannot meet the exact design requirements. To improve the core's safety, a geomembrane is often laid on the core surface and anchored to the concrete cushion on both sides of the core and the anti-seepage wall at the core's base to form a complete anti-seepage system. Due to the spatial inflection between the core's surface and base, and the complex local intersections with the concrete, gaps are difficult to avoid during construction where the geomembrane bends in different directions and is anchored to the cushion concrete. Direct bolt anchoring can also cause the geomembrane to collapse if the preload is too high, and long-term operation can cause the bolts to loosen. This can leave gaps in the complete geomembrane anti-seepage system, creating additional risks for the core, leading to safety accidents such as excessive pore water pressure and uneven settlement. Therefore, it is necessary to design overlap joints where the geomembrane is anchored to the cushion concrete in areas with complex spatial inflections to prevent the formation of overlap gaps and improve project reliability. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an anchoring overlap structure and construction method for geomembranes with different bending directions that can effectively overlap and seal geomembranes with different bending directions on the cushion concrete without leaving any gaps and with good sealing performance.

[0004] The technical solution of the anchoring overlap structure of geomembranes with different bending directions of the present invention is: it includes an anchoring belt, a geomembrane, a bolt, an angle steel, and a nut. The anchoring belt is arranged on the surface of the concrete. Two or more groups of geomembranes are arranged on the anchoring belt. Each of the geomembranes is bent in different directions. An angle steel is arranged on the geomembrane. The bolt passes through the angle steel, the geomembrane, and the anchoring belt and is inserted into the concrete. A nut is arranged on the upper head of the bolt. The nut is matched with the thread on the upper head of the bolt. The geomembranes bent in different directions are welded and connected by a welding machine. The connection between the geomembranes forms a first weld. The end of the geomembrane close to the anchoring belt is welded and connected to the anchoring belt by a manual welding gun. The connection between the geomembrane and the anchoring belt forms a second weld.

[0005] Furthermore, a first PVC gasket is provided between the bottom of the anchoring belt and the concrete, and epoxy resin glue is coated between the first PVC gasket and the concrete.

[0006] Furthermore, the surface of the bolt located inside the concrete is brushed with epoxy resin glue.

[0007] Furthermore, a second PVC gasket is provided between the geomembrane and the angle steel, epoxy resin glue is coated between the second PVC gasket and the angle steel, and epoxy resin glue is coated between the angle steel and the nut.

[0008] The technical solution of the construction method of the anchoring overlap structure of geomembranes with different bending directions of the present invention comprises the following steps: ① Place the anchor belt on a flat concrete surface, drill holes in the anchor belt and concrete, and inject epoxy resin glue into the holes; ②Bury bolts in the anchor belt and the drilled holes in the concrete; ③. Two or more sets of geomembranes are arranged on the anchoring belt, and each of the geomembranes is bent in different directions; ④. Install a second PVC gasket on the geomembrane, install angle steel on the second PVC gasket, and thread the upper end of the bolt through the geomembrane and the second PVC gasket to connect with the nut; ⑤. Welding is performed between two adjacent geomembranes bent in different directions by a welding machine to form a first weld at the welding point; ⑥. Use a manual welding gun to weld the end of the geomembrane close to the anchor belt to the anchor belt, forming a second weld at the welding point.

[0009] The beneficial effects of the anchoring overlap structure and construction method of the present invention for geomembranes in different bending directions are: 1. The geomembrane bent in different directions is connected to the anchor belt by welding, thereby preventing the formation of gaps between the geomembranes bent in different directions; Second, the geomembrane is anchored to the concrete through anchoring tapes, angle steels and bolts, thus avoiding gaps and ensuring the integrity and reliability of the dam's geomembrane anti-seepage structure; 3. Anchor the anchor belt to the concrete with bolts and seal it with epoxy resin glue to ensure that there is no gap between the geomembrane and the concrete surface; Fourth, the anchoring belt can be closely attached to the concrete surface, and the geomembrane bent in multiple directions can be welded according to the usage to meet the spatial transition relationship when the core wall contacts the concrete, avoiding the gap between the geomembrane upstream of the core wall and the concrete when it is anchored; 5. Flexible PVC gaskets and rigid angle steels are arranged between the geomembrane and the nuts respectively. The angle steels can effectively disperse the bolt pre-tightening force to avoid damaging the geomembrane, and the elasticity of the PVC gaskets can reduce bolt relaxation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional schematic diagram of the anchoring overlap structure of the geomembrane in different bending directions according to the present invention; Figure 2 It is a three-dimensional schematic diagram of geomembrane; Figure 3 It is a cross-sectional diagram of the coordination of concrete, anchoring tape, geomembrane, bolts, angle steel and nuts; Figure 4 yes Figure 3 A local enlarged schematic diagram of point A.

[0011] In the figure, 1. anchoring tape; 2. concrete; 3. geomembrane; 31. fitting portion; 32. bending portion; 4. angle steel; 5. nut; 6. first weld; 7. second weld; 8. epoxy resin glue; 9. first PVC gasket; 10. bolt; 11. second PVC gasket. DETAILED DESCRIPTION

[0012] The present invention relates to an anchoring and overlapping structure for geomembranes with different bending directions, such as Figure 1 — Figure 4 As shown, it includes an anchoring belt 1, a geomembrane 3, a bolt 10, an angle steel 4, and a nut 5. The anchoring belt 1 is arranged on the surface of the concrete 2. Its arrangement position is diverse and can change with the shape of the surface of the concrete 2. Its size can be determined according to the range of overlap required by the geomembrane 3. Two or more groups of geomembranes 3 are arranged on the anchoring belt 1. The geomembrane 3 has a fitting portion 31 that fits with the upper surface of the anchoring belt 1, and a bent portion 32 that is bent and upright. The bent portions 32 of each geomembrane 3 are bent in different directions. An angle steel 4 is provided on the fitting portion 31 of the geomembrane 3, and the bolt 10 passes through the angle steel 4, the geomembrane 3, and the anchor belt 1 and is inserted into the concrete 2. A nut 5 is provided on the upper end of the bolt 10, and the nut 5 is threadedly matched with the upper end of the bolt 10. The bent portions 32 of each geomembrane 3 bent in different directions are welded together by a welding machine, and a first weld 6 is formed at the connection. The fitting portion 31 of the geomembrane 3 is close to the end of the anchor belt 1 and is welded together with the anchor belt 1 by a manual welding gun, and a second weld 7 is formed at the connection.

[0013] Furthermore, a first PVC gasket 9 is provided between the bottom of the anchoring strip 1 and the concrete 2, and epoxy resin glue 8 is applied between the first PVC gasket 9 and the concrete 2. Since the surface of the concrete 2 may not be completely flat, the first PVC gasket 9 and epoxy resin glue 8 can be provided on the surface to maximize the flatness of the surface of the concrete 2.

[0014] Furthermore, the surface of the bolt 10 is brushed with epoxy resin glue 8 inside the concrete 2. With the epoxy resin glue 8, the sealing performance between the bolt 10 and the concrete 2 is improved.

[0015] Furthermore, a second PVC gasket 11 is provided between the geomembrane 3 and the angle steel 4, epoxy resin glue 8 is applied between the second PVC gasket 11 and the angle steel 4, and epoxy resin glue 8 is applied between the angle steel 4 and the nut 5. With the epoxy resin glue 8, the sealing between the geomembrane 3, the angle steel 4, and the nut 5 is improved.

[0016] The construction method of the anchoring overlap structure of geomembranes with different bending directions of the present invention comprises the following steps: ①. Place the anchoring tape 1 on the flat surface of the concrete 2. If the surface of the concrete 2 is uneven, apply epoxy resin glue 8 to the surface of the concrete 2 and place a first PVC gasket 9 thereon to maximize the flatness of the surface of the concrete 2. Drill holes in the anchoring tape 1 and the concrete 2 and inject epoxy resin glue 8 into the holes. ②, embed bolts 10 in the drilled holes of the anchor belt 1 and the concrete 2; ③. Two or more sets of geomembranes 3 are arranged on the anchoring belt 1, and each of the geomembranes 3 is bent in different directions; ④. Install a second PVC gasket 11 on the geomembrane 3, install an angle steel 4 on the second PVC gasket 11, and thread the upper end of the bolt 10 through the geomembrane 3 and the second PVC gasket 11 to connect with the nut 5; ⑤. Welding two adjacent geomembranes 3 bent in different directions by a welding machine to form a first weld 6 at the welding point; ⑥. The end of the geomembrane 3 close to the anchoring belt 1 is welded to the anchoring belt 1 using a manual welding gun to form a second weld 7 at the welding point.

[0017] The above is only a preferred specific implementation method of the patent of the present invention, but the scope of protection of the patent of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the patent of the present invention, who makes equivalent replacements or changes based on the technical solution of the patent of the present invention and the invention patent concept of the patent, should be covered by the scope of protection of the patent of the present invention.

Claims

1. Anchoring and overlapping structure for geomembranes with different bending directions, characterized by: The invention comprises an anchoring belt (1), a geomembrane (3), a bolt (10), an angle steel (4), and a nut (5), wherein the anchoring belt (1) is arranged on the surface of the concrete (2), two or more groups of geomembranes (3) are arranged on the anchoring belt (1), each of the geomembranes (3) is bent in different directions, an angle steel (4) is arranged on the geomembrane (3), the bolt (10) passes through the angle steel (4), the geomembrane (3), and the anchoring belt (1) and is inserted into the concrete (2), and the bolt (10) is inserted into the concrete (2). 0) is provided with a nut (5), the nut (5) is matched with the thread of the upper head of the bolt (10), the geomembranes (3) bent in different directions are welded together by a welding machine, and the connection between the geomembranes (3) and the geomembranes (3) forms a first weld (6), the end of the geomembrane (3) close to the anchoring belt (1) is welded to the anchoring belt (1) by a manual welding gun, and the connection between the geomembrane (3) and the anchoring belt (1) forms a second weld (7).

2. The anchoring and overlapping structure for geomembranes with different bending directions according to claim 1, characterized in that: A first PVC gasket (9) is provided between the bottom of the anchoring strip (1) and the concrete (2), and epoxy resin glue (8) is applied between the first PVC gasket (9) and the concrete (2).

3. The anchoring and overlapping structure for geomembranes with different bending directions according to claim 1, characterized in that: The surface of the bolt (10) is located inside the concrete (2) and is brushed with epoxy resin glue (8).

4. The anchoring and overlapping structure for geomembranes with different bending directions according to claim 1, characterized in that: A second PVC gasket (11) is provided between the geomembrane (3) and the angle steel (4), epoxy resin glue (8) is applied between the second PVC gasket (11) and the angle steel (4), and epoxy resin glue (8) is applied between the angle steel (4) and the nut (5).

5. A construction method for an anchoring overlap structure for geomembranes with different bending directions, comprising the following steps: ①, placing the anchoring strip (1) on a flat concrete (2) surface, drilling holes in the anchoring strip (1) and the concrete (2), and injecting epoxy resin glue (8) into the holes; ②, embedding bolts (10) in the drilled holes of the anchoring belt (1) and the concrete (2); ③. Two or more sets of geomembranes (3) are arranged on the anchoring belt (1), and each of the geomembranes (3) is bent in different directions; ④. A second PVC gasket (11) is arranged on the geomembrane (3), an angle steel (4) is arranged on the second PVC gasket (11), and the upper end of the bolt (10) passes through the geomembrane (3) and the second PVC gasket (11) and is threadedly connected to the nut (5); ⑤. Welding two adjacent geomembranes (3) bent in different directions by means of a welding machine to form a first weld (6); ⑥. Welding the end of the geomembrane (3) close to the anchoring belt (1) to the anchoring belt (1) is performed using a manual welding gun, and a second weld (7) is formed at the welding point.

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