Water stop structure for the surface layer of expansion joints of hydraulic structures and its construction method

Abstract

A water stop structure for the surface layer of expansion joints of hydraulic structures and its construction method. The water stop structure includes an expansion joint and an elastic water stop strip structure inside the expansion joint; a primer layer is provided on the inner wall of the expansion joint and the top surfaces of the buildings on both sides, and the elastic water stop strip structure is located at the top of the expansion joint; the cross-section of the elastic water stop strip structure is rectangular, having a top surface, a bottom surface and two side surfaces; the top surface has a first arc-shaped curved surface structure, and / or the bottom surface has a second arc-shaped curved surface structure; inclined upward barb wing-shaped structures are provided on the two side surfaces; holes are provided inside the elastic water stop strip structure. The structure of the present invention is reliable and the stress form is stable, which can avoid problems such as settlement, peeling and shear failure of the expansion joints of hydraulic structures, and extend the service life of hydraulic structures.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy projects, and particularly relates to a water stop structure for the surface layer of expansion joints of hydraulic structures and a construction method thereof. Background Technique

[0002] In existing hydraulic concrete structures, such as water retaining dams, sluice gates, aqueducts, tunnels, channels and other water-related projects, due to the inability to complete continuous pouring at one time or considering the thermal expansion and contraction of concrete caused by temperature changes, expansion joints need to be set during pouring. Expansion joints are prone to leakage in hydraulic structures. The leakage hazard not only causes water loss, and usually internal buried water stop structures such as rubber water stop belts and copper water stops are provided in the expansion joints. However, due to the action of high water pressure and reverse water pressure, construction reasons, environmental reasons, etc., it is common that the internal buried water stop structure often has leakage problems. Once the water stop structure of the expansion joint is damaged, it will not only cause a reduction in the water conveyance volume, but may also lead to hazards such as the collapse of the main body of the hydraulic structure, frost heaving damage to the foundation, and foundation settlement. Therefore, it is a very necessary and effective measure to set a water stop structure on the surface layer of the expansion joints of newly built or existing hydraulic structures. The structure (caulking, surface sealing) and materials of the surface water stop must meet the functional requirements of the expansion joint, that is, they should have good durability, adapt to three-dimensional deformation, strong reconstructability, easy repair, and resistance to high water pressure.

[0003] At present, during the operation of hydraulic structures, especially for water conveyance tunnels, box culverts, channels, high dams, etc. under large deformation processes or positive and negative high water pressure, due to problems with the design of the water stop structure and the durability of materials, the caulking structure may be separated from the expansion joint wall, and structural failures such as the collapse and shear failure of the surface sealing coating may occur, as well as problems such as peeling, powdering, and aging durability. In addition, it is difficult to repair and reconstruct the above-mentioned surface water stop structure after it is damaged.

[0004] Therefore, in order to ensure the safe operation of the project, it is necessary to set a surface water stop structure for the expansion joint of the hydraulic structure with high reconstructability, easy repair, strong reinforcement ability, good impermeability, adaptability to large deformation, resistance to high water pressure, and high durability. Summary of the Invention

[0005] The purpose of the invention is to provide a water stop structure for the surface layer of expansion joints of hydraulic structures and a construction method thereof, with reliable structure and stable stress form, which can avoid problems such as settlement, peeling, and shear failure of the expansion joints of hydraulic structures.

[0006] To achieve the above purpose, the invention adopts the following technical solutions:

[0007] A water stop structure for the surface layer of expansion joints of hydraulic structures includes an expansion joint and an elastic water stop strip structure inside the expansion joint;

[0008] The inner wall of the expansion joint and the top surfaces of the buildings on both sides are provided with a primer layer, and the elastic water stop strip structure is located at the top of the expansion joint;

[0009] The cross-section of the elastic water stop strip structure is rectangular, having a top surface, a bottom surface and two side surfaces; the top surface has a first arc-shaped curved surface structure, and / or the bottom surface has a second arc-shaped curved surface structure; the two side surfaces are provided with barbed wing-shaped structures extending obliquely upward; there are holes inside the elastic water stop strip structure.

[0010] In one embodiment, the holes are filled with a flowing plastic filler, and channels are provided at positions on the side surfaces corresponding to the tops of the holes, so that the flowing plastic filler flows into the space between the side surfaces and the inner wall of the expansion joint through the channels.

[0011] In one embodiment, there are a plurality of the holes, and they are symmetric with respect to a horizontal plane or a vertical plane; the holes are circular, oval or polygonal; the area of the holes accounts for 30-80% of the cross-sectional area of the elastic water stop strip structure, preferably 50%.

[0012] In one embodiment, the included angle between the barbed wing-shaped structure and the side surface is 45-90°.

[0013] In one embodiment, fillers are provided between adjacent upper and lower barbed wing-shaped structures.

[0014] In one embodiment, baffles extend horizontally from the top surface of the elastic water stop strip structure to both sides. The two baffles are located on the top surfaces of the buildings on both sides of the expansion joint, or the two baffles are located on the stepped parts recessed inward from the inner wall of the expansion joint, so that the top surfaces of the baffles are flush with the top surfaces of the buildings on both sides of the expansion joint; the tops of the baffles are convex structures, concave structures or flat structures.

[0015] In one embodiment, a sealing coating is provided on the top surface of the elastic water stop strip structure, and both ends of the sealing coating are fixed in the grooves on the top surface of the building.

[0016] In one embodiment, a non-bonding layer is provided between the sealing coating and the top surface of the elastic water stop strip structure.

[0017] In one embodiment, both the first arc-shaped curved surface structure and the second arc-shaped curved surface structure are concave structures or convex structures.

[0018] A construction method for the water stop structure on the surface layer of the expansion joint of a hydraulic structure as described above includes the following steps:

[0019] (1) According to the shape of the top surface of the elastic water stop strip structure, cut a groove at the expansion joint to form a T-shaped structure, or directly proceed to step (2);

[0020] (2) Clean the concrete dust and floating slurry on the inner wall of the expansion joint and on both sides;

[0021] (3) Apply a primer layer that matches the elastic waterstop strip structure. According to the structure of the holes in the elastic waterstop strip structure, fill the holes with a flowing plastic filler, and / or

[0022] Set fillers between the barbed wing-shaped structures adjacent to the upper and lower parts of the elastic waterstop strip structure, and / or

[0023] Embed the elastic waterstop strip structure into the expansion joint;

[0024] (4) Apply a non-sticking layer to the first arc-shaped surface structure on the top surface of the elastic waterstop strip structure; and apply a primer layer that matches the surface sealing coating to the concrete surfaces on both sides of the top of the expansion joint;

[0025] (5) Spray or apply a surface sealing coating on the top of the expansion joint.

[0026] In one embodiment, the elastic waterstop strip structure is made of rubber material, polyurethane material, ethylene propylene diene monomer (EPDM) rubber material or polyurea material; the sealing coating is made of polyurethane material or polyurea material; the flowing plastic filler is GB material or SR material.

[0027] The beneficial effects of the present invention are as follows: The waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention has a reliable structure and a stable stress form, which can avoid problems such as settlement, peeling, and shear failure of the expansion joints of hydraulic structures, and extend the service life of hydraulic structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A is a schematic structural diagram of Embodiment 1 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0029] Figure 1B is a schematic structural diagram of an elastic waterstop strip structure in Embodiment 1 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0030] Figure 1C is another schematic structural diagram of an elastic waterstop strip structure in Embodiment 1 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0031] Figure 2 is a schematic structural diagram of Embodiment 2 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0032] Figure 3A is a schematic diagram of the state before compression of Embodiment 3 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0033] Figure 3B is a schematic diagram of the state after compression of Embodiment 3 of the waterstop structure for the surface layer of the expansion joint of hydraulic structures in the present invention.

[0034] Figure 4A It is a schematic diagram of the state before compression of Embodiment 4 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0035] Figure 4B It is a schematic diagram of the state after compression of Embodiment 4 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0036] Figure 5A It is a schematic diagram of the structure of Embodiment 5 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0037] Figure 5B It is a schematic diagram of a structure of the elastic water stop strip structure in Embodiment 5 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0038] Figure 5C It is another schematic diagram of the structure of the elastic water stop strip structure in Embodiment 5 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0039] Figure 5D It is yet another schematic diagram of the structure of the elastic water stop strip structure in Embodiment 5 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0040] Figure 6A It is a schematic diagram of the state before tension of Embodiment 6 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0041] Figure 6B It is a schematic diagram of the state after tension of Embodiment 6 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0042] Figure 7A It is a schematic diagram of the state before tension of Embodiment 7 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0043] Figure 7B It is a schematic diagram of the state after tension of Embodiment 7 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0044] Figure 8 It is a schematic diagram of the structure of Embodiment 8 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention.

[0045] Figure 9 It is a schematic diagram of the structure of Embodiment 9 of the water stop structure for the surface layer of the expansion joint of the hydraulic structure of the present invention. Detailed implementation manners

[0046] In order to make the technical solutions and beneficial effects of the present invention more clear and understandable, the present invention will be further described in detail below in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] As Figure 1A shown, it is Embodiment 1 of a water stop structure for the surface layer of expansion joints of hydraulic structures provided by the present invention, including an expansion joint 1 and an elastic water stop strip structure 2 inside the expansion joint 1. The elastic water stop strip structure 2 is made of rubber material, polyurethane material, ethylene propylene diene monomer (EPDM) rubber material or polyurea material.

[0048] The inner wall of the expansion joint 1 and the top surfaces 3 of the buildings on both sides are provided with a primer layer, and the elastic water stop strip structure 2 is located at the top of the expansion joint 1. The cross-section of the elastic water stop strip structure 2 is rectangular, having a top surface 21, a bottom surface 22 and two side surfaces 23. The top surface 21 has a first arc-shaped curved surface structure 211, and the bottom surface 22 has a second arc-shaped curved surface structure 221. Two side surfaces 23 are provided with barbed wing-shaped structures 231 extending obliquely upward, and the included angle between the barbed wing-shaped structures 231 and the side surfaces is 45-90°. A plurality of holes 4 are provided inside the elastic water stop strip structure 2, and the holes 4 are symmetric with respect to the horizontal plane or the vertical plane. In this embodiment, both the first arc-shaped curved surface structure 211 and the second arc-shaped curved surface structure 221 are concave structures. Of course, they can also be convex structures. In this embodiment, the top surface 21 of the elastic water stop strip structure 2 is flush with the top surfaces 3 of the buildings on both sides of the expansion joint 1.

[0049] As Figure 1B 、 Figure 1C shown, in addition to Figure 1A the polygons in, the holes 4 of the elastic water stop strip structure 2 of the present invention can also be elliptical and symmetrically arranged. The hole area of the present invention accounts for 30-80% of the cross-sectional area of the elastic water stop strip structure 2, preferably 50%.

[0050] As Figure 2 shown, it is Embodiment 2 of the water stop structure for the surface layer of expansion joints of hydraulic structures of the present invention. The difference from Embodiment 1 is that a sealing coating 5 is provided on the top surface of the elastic water stop strip structure 2. The sealing coating 5 is made of polyurethane material or polyurea material, and its shape corresponds to the top surface of the elastic water stop strip structure 2. Both ends of the sealing coating 5 are fixed in the grooves 31 on the top surface 3 of the building. Further, a non-bonding layer 6 is provided between the sealing coating 5 and the top surface of the elastic water stop strip structure 2.

[0051] As Figure 3AAs shown, this is Embodiment 3 of the water stop structure on the surface of the expansion joint of the hydraulic structure of the present invention. The difference from Embodiment 2 is that the inside of the hole 4 is filled with a flowing plastic filler 41, and a channel 42 is provided at the position on the side surface 23 corresponding to the top of the hole 4, so that the flowing plastic filler 41 flows into the space between the side surface 23 and the inner wall of the expansion joint 1 through the channel 42. Figure 3A This is the state of the entire structure before compression in this embodiment. Figure 3B In [description not provided in the original], under the compression of the entire structure in this embodiment, the flowing plastic filler 41 is extruded and blocked between the barbed airfoil structure and the inner wall of the expansion joint, forming a dense water stop structure.

[0052] As Figure 4A shown, this is Embodiment 4 of the water stop structure on the surface of the expansion joint of the hydraulic structure of the present invention. The difference from Embodiment 3 is that the hole 4 of the elastic water stop strip structure 2 of the present invention is diamond-shaped and symmetrically arranged. Figure 4A This is the state of the entire structure before compression in this embodiment. Figure 4B In [description not provided in the original], under the compression of the entire structure in this embodiment, the flowing plastic filler 41 is extruded and blocked between the barbed airfoil structure and the inner wall of the expansion joint, forming a dense water stop structure.

[0053] As Figure 5A shown, this is Embodiment 5 of the present invention. In this embodiment, the difference from Embodiment 2 is that the top surface of the elastic water stop strip structure 2 extends horizontally to both sides and is provided with baffles 24, so that the elastic water stop strip structure 2 is in a T shape. The two baffles 24 are located on the stepped part 11 recessed inward from the inner wall of the expansion joint 1, so that the top surface of the baffle 24 is flush with the building top surfaces 3 on both sides of the expansion joint 1. The shape of the sealing coating 5 corresponds to the top surface of the elastic water stop strip structure 2 and the baffles 24. The top of the baffle 24 can be a convex structure, a concave structure or a flat structure.

[0054] As Figure 5B 、 Figure 5C 、 5D shown, in addition to the polygon in Figure 5A , the hole 4 of the elastic water stop strip structure 2 of the present invention can also be elliptical or diamond-shaped and symmetrically arranged.

[0055] As Figure 6A shown, this is Embodiment 6 of the present invention. In this embodiment, the difference from Embodiment 5 is that the inside of the hole 4 on both sides is filled with a flowing plastic filler 41, and a channel 42 is provided at the position on the side surface 23 corresponding to the top of the hole 4, so that the flowing plastic filler 41 flows into the space between the side surface 23 and the inner wall of the expansion joint 1 through the channel 42.

[0056] Figure 6A This is the state of the entire structure before tension in this embodiment. [[ID=३९]] Figure 6BIn this embodiment, under the action of tension, the flowing plastic filler 41 is extruded and blocked between the barbed airfoil structure and the inner wall of the expansion joint, forming a dense water stop structure.

[0057] As Figure 7A shown, this is Embodiment 7 of the present invention. In this embodiment, the difference from Embodiment 6 is that the hole 4 is diamond-shaped. Figure 7A This is the state of the entire structure of this embodiment before being compressed. In Figure 7B this embodiment, under the action of compression, the flowing plastic filler 41 is extruded and blocked between the barbed airfoil structure and the inner wall of the expansion joint, forming a dense water stop structure.

[0058] As Figure 8 shown, this is Embodiment 8 of the present invention. In this embodiment, the difference from Embodiment 5 is that the baffle 24 is located on the building top surface 3 on both sides of the expansion joint and is higher than the building top surface 3.

[0059] As Figure 9 shown, this is Embodiment 9 of the present invention. In this embodiment, the difference from Embodiment 6 is that the baffle 24 is located on the building top surface 3 on both sides of the expansion joint and is higher than the building top surface 3.

[0060] The present invention also provides a construction method for the water stop structure used on the surface layer of the expansion joint of hydraulic structures, including the following steps:

[0061] (1) According to the shape of the top surface of the elastic water stop strip structure, cut a groove at the expansion joint to form a T-shaped structure, or directly proceed to step (2);

[0062] (2) Clean the concrete dust and floating slurry on the inner wall and both sides of the expansion joint;

[0063] (3) Apply the supporting primer layer of the elastic water stop strip structure. According to the structure of the holes of the elastic water stop strip structure, fill the flowing plastic filler in the holes, and / or

[0064] set fillers between the adjacent barbed airfoil structures above and below the elastic water stop strip structure, and / or

[0065] embed the elastic water stop strip structure into the expansion joint;

[0066] (4) Apply a non-adhesive layer on the first arc-shaped curved surface structure of the top surface of the elastic water stop strip structure; and apply the supporting primer layer of the surface sealing coating on the concrete surfaces on both sides of the top of the expansion joint;

[0067] (5) Spray or apply a surface sealing coating on the top of the expansion joint.

[0068] Among them, the elastic water stop strip structure 2 is made of rubber material, polyurethane material, ethylene propylene diene monomer rubber material or polyurea material; the sealing coating 5 is made of polyurethane material or polyurea material; the flowing plastic filler 41 is GB material or SR material.

[0069] In the present invention, the first arc-shaped curved surface structure 211 and the second arc-shaped curved surface structure 221 of the elastic water stop strip structure have the function of reducing water pressure, which can avoid the damage of the water stop structure; the barbed airfoil structure 231 of the elastic water stop strip structure 2 is convenient for construction, and only needs to press the elastic water stop strip structure 2 into the expansion joint 1. The flowing plastic filler 41 can also be filled in the hole 4 of the present invention. When the expansion joint 1 bears forward, reverse or telescopic deformation, the filling material is extruded between the side surface 23 and the inner wall of the expansion joint 1 to prevent water seepage. The water stop structure of the present invention is used for the surface layer of the expansion joint of hydraulic structures, and has a reliable structure and a stable stress form, which can avoid problems such as settlement, peeling and shear failure of the expansion joint of hydraulic structures, and extend the service life of hydraulic structures.

[0070] The above are only the preferred embodiments of the present invention, and do not impose any formal restrictions on the structure of the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A water stop structure for the surface layer of expansion joints of hydraulic structures, characterized in that, It includes an expansion joint and an elastic water stop strip structure inside the expansion joint; A primer layer is provided on the inner wall of the expansion joint and the top surfaces of the buildings on both sides. The elastic water stop strip structure is located at the top of the expansion joint; The cross-section of the elastic water stop strip structure is rectangular, having a top surface, a bottom surface and two side surfaces; the top surface has a first arc-shaped curved surface structure, and / or the bottom surface has a second arc-shaped curved surface structure; barbed wing-shaped structures extending obliquely upward are provided on the two side surfaces; holes are provided inside the elastic water stop strip structure; The holes are filled with a flowing plastic filler. Channels are provided at positions on the side surfaces corresponding to the tops of the holes, so that the flowing plastic filler flows into the space between the side surfaces and the inner wall of the expansion joint through the channels; The included angle between the barbed wing-shaped structure and the side surface is 45 to 90°. Fillers are provided between adjacent barbed wing-shaped structures up and down; A sealing coating is provided on the top surface of the elastic water stop strip structure. Both ends of the sealing coating are fixed in the grooves on the top surface of the building; 2. The water stop structure for the surface of the expansion joint of hydraulic structures according to claim 1, characterized in that: There are multiple holes, which are symmetric with respect to the horizontal plane or the vertical plane; the holes are circular, elliptical or polygonal; the area of the holes accounts for 30 to 80% of the cross-sectional area of the elastic water stop strip structure; 3. The water stop structure for the surface of the expansion joint of hydraulic structures according to claim 1, characterized in that: Baffles extending horizontally to both sides are provided on the top surface of the elastic water stop strip structure. The two baffles are located on the top surfaces of the buildings on both sides of the expansion joint, or the two baffles are located on the stepped parts recessed inward from the inner wall of the expansion joint, so that the top surfaces of the baffles are flush with the top surfaces of the buildings on both sides of the expansion joint; the tops of the baffles are convex structures, concave structures or flat structures; 4. The water stop structure for the surface layer of the expansion joint of hydraulic structures according to claim 1, characterized in that: A non-bonding layer is provided between the sealing coating and the top surface of the elastic water stop strip structure; 5. The water stop structure for the surface layer of the expansion joint of hydraulic structures according to claim 1, characterized in that: Both the first arc-shaped curved surface structure and the second arc-shaped curved surface structure are concave structures or convex structures; 6. A construction method for a water stop structure on the surface of expansion joints of hydraulic structures according to any one of claims 1-5, characterized in that, It includes the following steps: (1) According to the shape of the top surface of the elastic water stop strip structure, cut a groove at the expansion joint to form a T-shaped structure, or directly proceed to step (2); (2) Clean the concrete dust and floating slurry on the inner wall of the expansion joint and on both sides; (3) Apply the supporting primer layer of the elastic water stop strip structure. According to the structure of the holes in the elastic water stop strip structure, fill the holes with a flowing plastic filler; Set fillers between adjacent barbed wing-shaped structures up and down of the elastic water stop strip structure; Embed the elastic water stop strip structure into the expansion joint; (4) Apply a non-bonding layer on the first arc-shaped curved surface structure of the top surface of the elastic water stop strip structure; and apply the primer layer supporting the surface sealing coating on the concrete surfaces on both sides of the top of the expansion joint; (5) Spray or apply the surface sealing coating on the top of the expansion joint; 7. The construction method of the water stop structure for the surface of the expansion joint of hydraulic structures according to claim 6, characterized in that: The elastic water stop strip structure is made of rubber material, polyurethane material or polyurea material; the sealing coating is made of polyurethane material or polyurea material; the flowing plastic filler is GB material or SR material;

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