Expansion joint anti-seepage reinforcing structure

Abstract

The utility model provides an expansion joint anti-seepage reinforcing structure, an original water stop belt and an original sealing layer are arranged in an expansion joint, the original sealing layer is arranged on the front side of the original water stop belt, the original sealing layer comprises a filling layer, a water stop layer, a deformation layer and a compression-resistant layer, the filling layer is arranged in the expansion joint and arranged on the rear side of the original water stop belt, and the compression-resistant layer is arranged on the rear side of the original water stop belt. The filling layer comprises a filling medium subjected to waterproof treatment; the water stop layer is filled between the original water stop belt and the filling layer; the deformation layer is arranged on the rear side of the filling layer and blocks an opening of the expansion joint; the compression-resistant layer is arranged on the outer side of the expansion joint, the compression-resistant layer is arranged on the rear side of the deformation layer, and the deformation layer is fixed in the expansion joint through the compression-resistant layer; the anti-leakage structure can effectively prevent leakage, and the effective anti-leakage lasting time is long.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint waterproofing technology, specifically to an expansion joint waterproofing reinforcement structure. Background Technology

[0002] In water conservancy projects, dams, as important water-retaining structures, are crucial for safe and stable operation. Expansion joints on the dam's backwater side are key components of the dam structure, playing a vital role in accommodating deformations caused by factors such as temperature changes and foundation settlement. However, expansion joints have also become one of the main potential sources of dam leakage.

[0003] Currently, existing expansion joints on the backwater side of dams have many shortcomings in addressing seepage problems. Traditional expansion joint sealing materials and construction methods are insufficient to effectively solve this persistent problem. On the one hand, commonly used sealing materials such as rubber and plastic waterstops are prone to aging, cracking, and deformation under long-term water pressure, ultraviolet radiation, and temperature changes, leading to a decline in sealing performance and an inability to effectively prevent water leakage. On the other hand, during the construction of existing expansion joint structures, due to the complexity of construction techniques and the difficulty in ensuring construction quality, issues such as insecure installation of sealing materials and incomplete sealing often arise, further exacerbating the risk of seepage. Moreover, once seepage occurs in the expansion joints, traditional repair and reinforcement methods are often ineffective, costly, and fail to fundamentally solve the problem, requiring frequent maintenance and repairs. This not only consumes significant manpower, material resources, and financial resources but also poses a potential threat to the safe operation of the dam.

[0004] There is an urgent need to develop a new expansion joint anti-seepage reinforcement structure to effectively solve the seepage problem and improve the safety and durability of the dam. Utility Model Content

[0005] The purpose of this invention is to provide a leak-proof reinforcement structure for expansion joints that can effectively prevent leakage and has a long-lasting leak-proof effect.

[0006] To achieve the above objectives, this utility model provides a leak-proof reinforcement structure for expansion joints. The expansion joint contains an original waterstop and an original sealing layer. The original sealing layer is located in front of the original waterstop and includes a filling layer, a waterstop layer, a deformation layer, and a pressure-resistant layer. The filling layer is located inside the expansion joint and behind the original waterstop, and includes a waterproof filling medium. The waterstop layer is injected between the original waterstop and the filling layer. The deformation layer is located behind the filling layer and seals the opening of the expansion joint. The pressure-resistant layer is located on the outside of the expansion joint, fixing the deformation layer inside the expansion joint.

[0007] As can be seen from the above scheme, by setting a water-stop layer, it can serve as the first anti-seepage layer; by setting a filling layer, it can serve as the second anti-seepage layer, playing a role in preventing seepage and sealing; by setting a deformation layer, it can serve as the third anti-seepage layer, playing a role in sealing and preventing seepage, and also adapting well to the expansion and contraction characteristics of the expansion joint, ensuring that the anti-seepage effect can still be maintained after the expansion and contraction of the expansion joint; by setting a pressure-resistant layer, it plays a role in resisting pressure and reinforcement. This utility model, without destroying the original water-stop structure, creates a new water-stop system behind the original water-stop strip. The water-stop system adopts a multi-layer waterproofing and outer pressure-resistant method, solving the problems of leakage and pressure resistance of the expansion joint on the back water surface of the dam, which can effectively achieve anti-seepage and maintain the anti-seepage effect for a long time.

[0008] A further option is to use a flexible permeable material as the filling medium, and to impregnate the filling medium with a waterproofing liquid, or to coat the surface of the filling medium with a waterproofing liquid.

[0009] As can be seen from the above scheme, the filling medium treated with waterproof liquid has a waterproof effect through the above settings. After being compressed into the expansion joint, it can form overlapping layers of anti-seepage layer, which helps to improve the anti-seepage effect.

[0010] A further proposed solution is to use geotextile as the filling medium and polyurea grout as the waterproofing liquid.

[0011] As can be seen from the above scheme, through the above settings, the geotextile plays a reinforcing role for the polyurea grout, which facilitates the prevention of high-pressure grout from flowing out and allows the grout to be squeezed and filled into the crack as much as possible. The leakage-sealing performance of polyurea grout is better than that of ordinary leakage-sealing products. At the same time, polyurea grout also has good tensile ductility, making it more suitable for solving water leakage problems in cracks such as deformation joints and expansion joints.

[0012] A further proposed solution is to use grouting material as the waterstop layer, and the grouting material is acrylate grouting liquid.

[0013] As can be seen from the above scheme, acrylate can expand when it comes into contact with water and shrink when it dries. Its bonding strength with concrete is greater than its own shrinkage strength, making it less prone to cracking. Moreover, acrylate has strong permeability and can penetrate well into the fine cracks of concrete under appropriate grouting pressure, ensuring that all cracks are filled with a water-stopping layer. In addition, acrylate can still firmly adhere to the concrete surface in a wet-dry cycle environment and will not detach from the concrete crack surface due to water loss and shrinkage. When the groundwater level rises, the acrylate gel will re-expand under the immersion of water, so that the cracks will not leak even after the wet-dry cycle, thus playing a long-term role in water blocking and preventing leakage.

[0014] A further step is to fill the gaps within the filling medium, as well as the gaps between the filling medium and the sidewalls of the expansion joint.

[0015] As can be seen from the above scheme, the above settings ensure that the waterstop layer, the filling layer, and the sidewalls of the expansion joint can fit tightly together, which helps to further improve the anti-leakage effect.

[0016] A further option is to use an elastic material for the deformable layer, and to have sealant around the perimeter of the deformable layer.

[0017] As can be seen from the above scheme, by setting up the above configuration, sealant is applied around the deformable layer. The sealant can maintain a sealed connection with its adjacent components (such as the sidewall of the expansion joint or the sidewall of the pressure-resistant layer). The sealant not only fixes the deformable layer, but also serves as another waterproof layer, which can block water and prevent leakage.

[0018] A further embodiment is that the compressive layer includes a cross-bracing member, at least two fixing plates, at least two clamping plates, and at least two sets of locking fasteners. The two fixing plates are respectively set on the left and right sides of the expansion joint, and the clamping plates are set correspondingly to the fixing plates. The cross-bracing member spans the expansion joint, and both sides of the cross-bracing member are set between the corresponding fixing plates and clamping plates and fixedly connected by locking fasteners. The middle part of the cross-bracing member is set correspondingly to the deformation layer.

[0019] A further proposed solution is to use elastic materials for the cross-section components.

[0020] As can be seen from the above scheme, the above settings facilitate the adaptation of the cross-section components to the expansion and contraction characteristics of the expansion joint, ensuring that the cross-section components can always play a role in resisting pressure and strengthening.

[0021] A further option is that the expansion joint anti-leakage reinforcement structure also includes a decorative layer, which is placed on the outside of the pressure-resistant layer.

[0022] A further proposed solution is to use a metal plate as the decorative layer, with the metal plate being either curved or polygonal. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0025] See Figure 1 This embodiment provides a seepage-proof reinforcement structure for expansion joints. The expansion joint contains an original waterstop 1 and an original sealing layer 2, with the original sealing layer 2 positioned in front of the original waterstop 1. The original waterstop 1 is the waterstop installed during the construction of the expansion joint, and the original sealing layer 2 is the sealing material installed during the construction of the expansion joint. In this embodiment, "front side" refers to the water-facing side, and "rear side" refers to the side away from the water.

[0026] The expansion joint anti-leakage reinforcement structure in this embodiment includes a filling layer 3, a water-stopping layer 4, a deformation layer 5, and a pressure-resistant layer 6.

[0027] The filling layer 3 is disposed within the expansion joint and behind the original waterstop 1. The filling layer 3 includes a waterproofed filling medium. The filling medium is a flexible, permeable material, and is either impregnated with a waterproofing liquid or its surface is coated with a waterproofing liquid. The waterproofed filling medium is compressed into the expansion joint. Preferably, the filling medium is compacted within the expansion joint to reduce the gaps formed after compression and to reduce the gaps between the filling medium and the inner wall of the expansion joint.

[0028] In this embodiment, the filling medium is geotextile, and the waterproofing liquid is polyurea grout. Geotextile is a permeable geosynthetic material made of synthetic fibers through needle punching or weaving. Polyurea grout is a high-performance, single-component, high-molecular-weight leak-stopping and crack-filling protective material made from polyurea emulsion as a base material through scientific processing. Its high solids content, non-shrinkage, and hydrophilic reaction make its leak-stopping performance superior to ordinary leak-stopping products. It also has high strength and high tensile ductility, which can cover cracks and effectively solve the leakage and re-leakage of cracks such as deformation joints, expansion joints, and junction joints. The geotextile can act as a reinforcement for the polyurea grout. After the geotextile impregnated with polyurea grout is compressed into the expansion joint, a protective layer can be formed inside the expansion joint to prevent the grout from flowing out during subsequent grouting, so that the grout is squeezed and filled into the joint as much as possible. Moreover, polyurea grout has a seepage-proof effect and strong adhesion to concrete, forming a waterproof layer to prevent water from seeping outwards.

[0029] The waterstop layer 4 is injected between the original waterstop 1 and the filling layer 3. The waterstop layer 4 also fills the gaps within the filling medium and the gaps between the filling medium and the expansion joint sidewall. The waterstop layer 4 forms another seepage-proof layer, ensuring a tight fit between the waterstop layer 4 and the filling layer 3 and the expansion joint sidewall, thus improving the seepage-proof effect. The waterstop layer 4 is a grouting material. During grouting, the grout also extends along the gaps to the front of the original waterstop 1 to seal the gap between the original waterstop 1 and the original sealing layer 2.

[0030] In this embodiment, the grouting material is acrylate grout. Acrylate grout is a water-soluble grouting material with acrylate as the main component, comprising acrylate, an accelerator, and an initiator. Acrylate grout is typically injected using a two-liquid grouting pump, allowing it to penetrate deep into micro-cracks in the concrete structure, such as those less than 0.2 mm in diameter. After curing, the acrylate grout forms an elastic gel with an elongation greater than 100%, effectively solving the problem of structural expansion and contraction. It also exhibits good adhesion, with a bonding strength greater than the strength of the gel itself, enabling excellent bonding to the concrete surface. Furthermore, it possesses excellent impermeability, providing a good waterproofing effect.

[0031] The deformable layer 5 is disposed behind the filling layer 3 and is located inside the opening of the expansion joint, or outside the opening of the expansion joint and sealed to the pressure-resistant layer 6, thereby sealing the opening of the expansion joint. The deformable layer 5 is made of an elastic material and can change with the expansion and contraction of the expansion joint, ensuring that the internal sealing material is not squeezed out. The deformable layer 5 can be a rubber material, preferably pre-cured butyl rubber. Pre-cured butyl rubber is characterized by high elasticity, impact resistance, and good compression set resistance. It can withstand extreme environments of high and low temperatures and has good oxidation resistance, aging resistance, and chemical corrosion resistance. This embodiment utilizes the corrosion resistance and easy extensibility of pre-cured butyl rubber to make the deformable layer 5.

[0032] A sealant is provided around the deformable layer 5. The sealant is preferably polysulfide sealant. It is used to seal the gap between the deformable layer 5 and the filling layer 3, the gap between the deformable layer 5 and the inner wall of the expansion joint, or the gap between the deformable layer 5 and the fixing plate 62.

[0033] The compressive strength layer 6 is located on the outside of the expansion joint and on the rear side of the deformation layer 5, thus fixing the deformation layer 5 within the expansion joint. Specifically:

[0034] The compressive strength layer 6 includes a spanning member 61, at least two fixing plates 62, at least two clamping plates 63, and at least two sets of locking fasteners 64. The two fixing plates 62 are respectively disposed on the left and right sides of the expansion joint, and the clamping plates 63 are correspondingly disposed on the fixing plates 62. The spanning member 61 spans the opening of the expansion joint, with both sides of the spanning member 61 disposed between the corresponding fixing plates 62 and clamping plates 63 and fixedly connected by the locking fasteners 64. The locking fasteners 64 include bolts and nuts. The bolts pass through the clamping plates 63, the spanning member 61, and the fixing plates 62, and are embedded in the concrete. The nuts are screwed onto the bolts and abut against the surface of the clamping plates 63. The middle part of the spanning member 61 is correspondingly disposed to the deformation layer 5. Preferably, the middle part of the spanning member 61 abuts against the deformation layer 5 to strengthen the fixation of the deformation layer 5 and limit accidental detachment of the deformation layer 5.

[0035] The cross-joint 61 is made of an elastic material. Preferably, in this embodiment, the cross-joint 61 is made of rubber, which can change with the expansion and contraction of the expansion joint. Both the fixing plate 62 and the clamping plate 63 can be made of metal plates, preferably steel plates.

[0036] In another embodiment, the expansion joint anti-leakage reinforcement structure also includes a decorative layer (not shown in the figure). The decorative layer is disposed on the outside of the compressive layer 6. The decorative layer can be fixed by fasteners 64 or by other fixing structures to the surface of the concrete 10, which is not limited here.

[0037] The decorative layer is a metal plate, which can be arc-shaped or polygonal. In this embodiment, an arc-shaped stainless steel plate is preferred, with the raised side of the arc-shaped stainless steel plate facing away from the surface of the concrete 10.

[0038] In summary, this invention provides a first-level anti-seepage layer by setting a water-stopping layer, a second-level anti-seepage layer by setting a filling layer, achieving both anti-seepage and sealing functions; a third-level anti-seepage layer by setting a deformation layer, which not only seals and prevents seepage but also adapts well to the expansion and contraction characteristics of the expansion joint, ensuring that the anti-seepage effect is maintained even after the expansion and contraction of the expansion joint; and a pressure-resistant layer provides pressure resistance and reinforcement. This invention creates a new water-stopping system behind the original water-stopping strip without damaging the original water-stopping structure. The water-stopping system adopts a multi-layer waterproofing and outer pressure-resistant method, solving the leakage and pressure resistance problems of the expansion joint on the backwater side of the dam, effectively achieving anti-seepage and maintaining the anti-seepage effect for a long time.

[0039] Finally, it should be emphasized that the above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leakproof reinforcement structure for a contraction joint, a primary waterstop and a primary seal are provided in the contraction joint, the primary seal is located on the front side of the primary waterstop, characterized in that, The expansion joint anti-leakage reinforcing structure comprises: a filling layer arranged in the expansion joint and at the back side of the original water stop, the filling layer comprising a filling medium subjected to waterproof treatment; a water stop layer injected between the original water stop and the filling layer; a deformation layer arranged at the back side of the filling layer and sealing the opening of the expansion joint; a compression-resistant layer arranged at the outer side of the expansion joint, the compression-resistant layer fixing the deformation layer in the expansion joint.

2. The expansion joint anti-leakage reinforcing structure according to claim 1, wherein: the filling medium is a flexible water-permeable material, the filling medium being subjected to immersion treatment by waterproof liquid, or the surface of the filling medium being coated with waterproof liquid.

3. The expansion joint anti-leakage reinforcing structure according to claim 2, wherein: the filling medium is geotextile, and the waterproof liquid is polyurea slurry.

4. The expansion joint anti-leakage reinforcing structure according to claim 1, wherein: the water stop layer is grouting material, and the grouting material is acrylic grouting liquid.

5. The expansion joint anti-leakage reinforcing structure according to claim 4, wherein: the water stop layer is further filled into the gaps in the filling medium and into the gaps between the filling medium and the side wall of the expansion joint.

6. The expansion joint anti-leakage reinforcing structure according to claim 1, wherein: the deformation layer is made of elastic material, and the deformation layer is provided with sealant around the periphery.

7. The expansion joint anti-leakage reinforcing structure according to claim 1, wherein: the compression-resistant layer comprises a cross member, at least two fixing plates, at least two clamping plates, and at least two sets of locking members, the two fixing plates being arranged at the left and right sides of the expansion joint respectively, the clamping plates being arranged correspondingly to the fixing plates, the cross member being arranged across the expansion joint, the two sides of the cross member being arranged between the corresponding fixing plates and clamping plates and being fixed by the locking members, and the middle part of the cross member being arranged correspondingly to the deformation layer.

8. The expansion joint anti-leakage reinforcing structure according to claim 7, wherein: the cross member is made of elastic material.

9. The expansion joint anti-leakage reinforcing structure according to any one of claims 1 to 8, further comprising a decorative layer arranged at the outer side of the compression-resistant layer.

10. The expansion joint anti-leakage reinforcing structure according to claim 9, wherein: the decorative layer is a metal plate, and the metal plate is provided in an arc shape or a polygonal shape. ​

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