High-corrosion-resistance double-layer epoxy steel bar welded mesh for sea-crossing bridge

Abstract

The utility model relates to the technical field of a high-corrosion-resistance double-layer epoxy steel bar welded mesh for a sea-crossing bridge, and discloses a high-corrosion-resistance double-layer epoxy steel bar welded mesh for a sea-crossing bridge, which comprises a steel bar reinforced cross. One reinforcing steel bar can be placed between every two limiting columns arranged on the periphery of the convenient-to-install welding frame assembly, manual welding can be conducted after the reinforcing steel bars are placed in place according to the distance adjusted by the convenient-to-install welding frame assembly, the efficiency of installing a welded net through the installation frame is higher, and the distance size is uniform; in addition, the limiting carrying assemblies arranged on the two sides can be arranged on the two sides in a sleeving mode for limiting after net welding is completed, and during carrying, a crane or a rope can be used for sleeving the lifting lugs on the periphery for carrying or binding a plurality of the limiting carrying assemblies; and finally, the external anti-friction assembly can be sleeved with an anti-friction block if the new welded wire mesh needs to be temporarily stored for a period of time after being produced, so that the junction of the edge is prevented from being rubbed during carrying.

Description

Technical Field

[0001] The utility model relates to the technical field of high corrosion resistance double-layer epoxy steel bar welded mesh for sea-crossing bridges, in particular to a high corrosion resistance double-layer epoxy steel bar welded mesh for sea-crossing bridges. Background Art

[0002] In the more than 40 years of reform and opening up, my country's trade and logistics industries have developed rapidly, and cross-sea bridges and port terminals have sprung up one after another. However, bridges built with reinforced concrete structures will suffer from corrosion and other problems after 20 to 30 years of use, which seriously affects the service life and safety of the bridge structure. Bridges will be in a harsh environment for a long time during the use stage, resulting in carbonization of reinforced concrete structures, chloride ion corrosion and other problems. With the increasing accumulation of reinforced concrete damage, the performance, bearing capacity and durability of the bridge structure will be directly reduced. Therefore, it is urgent to carry out anti-corrosion technology treatment on reinforced concrete bridges.

[0003] At present, the methods of steel-concrete anti-corrosion are mainly divided into two categories. The first category is the measures taken on the steel-concrete itself, such as using high-performance steel-concrete, increasing the thickness of the steel-concrete protective layer and coating the surface of the steel-concrete; the second category is the measures taken on the corrosion of steel bars, such as using steel bar rust inhibitors, epoxy coating of steel bars, steel bar cathodic protection, etc.

[0004] Steel bar rust inhibitors can effectively control the occurrence of rust without affecting the performance of concrete, but this material contains nitrite, which will have a certain impact on the environment. Epoxy coated steel bars have the advantage of low cost, but they are easy to damage the steel bar coating during processing and transportation, reducing the bonding strength between steel bars and concrete. Cathodic protection can achieve good anti-corrosion effects in the short term, but once there are adverse factors during use, the effectiveness and durability of the cathodic protection system will be greatly reduced.

[0005] Ordinary concrete steel bars will form a passivation film in a highly alkaline environment, but carbonization will reduce the alkalinity of the concrete and depassivate the steel bar surface. When water and oxygen penetrate into the steel bar, the steel bar will rust. Or when chloride ions penetrate into the steel bar surface to a sufficient concentration, the steel bar passivation film will still be destroyed even in a highly alkaline environment.

[0006] A large number of engineering practices have shown that in order to ensure that the steel bars of reinforced concrete slabs do not rust during use, the steel mesh must be treated with anti-corrosion. Although the anti-corrosion coatings currently used in most concrete are relatively low in cost, they have poor stability and are easy to precipitate, resulting in poor anti-rust ability and bonding performance of the coating.

[0007] A crack-resistant and corrosion-resistant steel mesh with supporting connecting rods disclosed in the Chinese utility model patent application disclosure specification CN216380260U is convenient for connecting the steel meshes by providing ear plates, limiting outer plates and limiting inner plates. When in use, the adjacent limiting outer plates are aligned with the limiting inner plates and then fixed with screws. However, using a large number of limiting plates to support the steel mesh is costly and may be cumbersome during installation. In addition, the outer surface is not coated with anti-corrosion paint, and the overall anti-corrosion effect is low. Utility Model Content

[0008] In view of the shortcomings of the prior art, the utility model provides a highly corrosion-resistant double-layer epoxy steel welded mesh for cross-sea bridges, which solves the problems of using a large number of limit plates to support the steel mesh, which is costly and may be cumbersome to install. In addition, the outer surface lacks anti-corrosion coating, and the overall anti-corrosion effect is low. Although the anti-corrosion coating currently used in most concrete is low in cost, the coating has poor stability and is easy to precipitate, resulting in poor anti-rust ability and bonding performance of the coating.

[0009] To achieve the above purpose, the utility model is implemented through the following technical solutions: a highly corrosion-resistant double-layer epoxy steel bar welded mesh for a cross-sea bridge, including a steel bar reinforcement cross, the top of the steel bar reinforcement cross is arranged with a plurality of first-layer epoxy steel bars, and the top surface of all the first-layer epoxy steel bars is arranged with a plurality of second-layer epoxy steel bars, wherein the surface centers of four of the second-layer epoxy steel bars are respectively provided with external anti-friction components on the left and right sides, and the left and right edges of all the first-layer epoxy steel bars are respectively covered with limited position handling components, and all the first-layer epoxy steel bars, the second A convenient installation welding frame assembly is provided at the bottom of the epoxy steel bars and steel bar reinforced cross, and the convenient installation welding frame assembly includes a U-shaped mounting frame A and a U-shaped mounting frame B. Connecting rods A and connecting rods B are respectively connected between the left and right end edges of the two U-shaped mounting frames A and B. The top surface of the U-shaped mounting frame A is provided with a plurality of limit columns A in an arranged form, and the top surface of the U-shaped mounting frame B is provided with a plurality of limit columns B in an arranged form. The top surface of the connecting rod A is provided with a plurality of limit columns C in an arranged form, and the top surface of the connecting rod B is provided with a plurality of limit columns D in an arranged form.

[0010] Optionally, the four corner intersections of the two first-layer epoxy steel bars and the second-layer epoxy steel bars are respectively wrapped with cross-shaped reinforcing wires, and the four edges of the four sides of the first-layer epoxy steel bars and the second-layer epoxy steel bars are respectively wrapped with a plurality of straight-line reinforcing wires in an arranged manner.

[0011] Optionally, the structure of the first layer of epoxy steel bars is the same as that of the second layer of epoxy steel bars, and the first layer of epoxy steel bars includes epoxy steel bars.

[0012] Optionally, the outer surface of the epoxy steel bar is provided with a plurality of reinforcement lines in an arranged manner, and the outer surface of the epoxy steel bar is coated with an epoxy resin powder coating layer.

[0013] Optionally, the limiting transport assembly includes an elliptical limiting rod, and the left and right end edges of the elliptical limiting rod are respectively connected to a lifting lug A and a lifting lug B, and the front and rear ends of the elliptical limiting rod are respectively provided with a plurality of limiting holes in an arranged manner.

[0014] Optionally, a plurality of threaded holes are arranged on the top surface of the elliptical limiting rod, and a threaded member A is provided on the top of each of the threaded holes.

[0015] Optionally, the external anti-friction component includes an anti-friction block, an arc groove is opened at the center of the top surface of the anti-friction block, an external interface is opened inside the anti-friction block, and threaded parts B are respectively provided on the left and right sides of the bottom surface of the anti-friction block.

[0016] In summary, the technical effects and advantages of the utility model are:

[0017] 1. The utility model has a reasonable structure. Through the research of steel bar anti-corrosion treatment process: the steel bar surface is sandblasted to make the cleanliness of the steel bar surface reach Sa2.5 level or above, and the surface roughness reaches Rz25-100um. The steel bar is preheated at 50-60℃ and kept warm for 5-10 minutes; the preheated and dried steel bar surface is electrostatically sprayed with epoxy resin powder coating, and two groups of spray guns are used to spray in reverse spirals in sequence, and the spraying range overlaps. The electrostatic voltage of the spraying is 50-65KV, and the electrostatic current is 6 2-80uA, atomization pressure is 0.3-0.45MPa, spraying distance is 150-200mm, the steel bars obtained after spraying are heated and cured, the heating temperature is 160-170℃, and the heating time is 2-2.5 hours. Cleaning and preheating the steel bars can ensure the effect of subsequent electrostatic spraying and improve the adhesion of the coating. By controlling the relevant parameters of electrostatic spraying, a uniform and dense anti-corrosion coating can be obtained, thereby improving the anti-corrosion performance of the steel bars. Prolonging the curing time can obtain a more stable anti-corrosion coating.

[0018] 2. In the utility model, a steel bar can be placed between every two limit columns arranged around the convenient installation welding frame assembly, and each steel bar can be placed in position according to the adjusted spacing for the convenient installation of the welding frame assembly before manual welding. The installation of the welding mesh using the installation frame is more efficient and has a uniform spacing size. In addition, the limit handling assemblies arranged on both sides can be put on both sides for limiting after the welding mesh is completed, and a crane or rope can be used to cover the surrounding lifting ears for transportation or multiple bundling during transportation. Finally, if the external anti-friction assembly needs to be temporarily stored for a period of time after the new welding mesh is produced, the anti-friction block can be put on to prevent the junction at the edge from being rubbed during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 To facilitate the installation of welding rack assembly structure diagram;

[0021] Figure 3 It is a schematic diagram of the structure of the limit handling component;

[0022] Figure 4 It is a schematic diagram of the structure of the external anti-friction component;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the welding mesh of the utility model;

[0024] Figure 6 This is a schematic diagram of the planar structure of the welding mesh of the utility model;

[0025] Figure 7 Schematic diagram of the internal planar structure of the first layer of epoxy steel bars.

[0026] In the figure: 1. The first layer of epoxy steel bars; 2. The second layer of epoxy steel bars; 3. Cross-shaped reinforcement wire; 4. I-shaped reinforcement wire; 5. Steel bar reinforcement cross; 6. Epoxy steel bars; 7. Reinforcement pattern; 8. Epoxy resin powder coating layer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example: Reference Figure 1-Figure 4A highly corrosion-resistant double-layer epoxy steel bar welded mesh for a cross-sea bridge is shown, comprising a steel bar reinforcement cross 5, wherein a plurality of first-layer epoxy steel bars 1 are arranged on the top of the steel bar reinforcement cross 5, and a plurality of second-layer epoxy steel bars 2 are arranged on the top surface of all first-layer epoxy steel bars 1, wherein the center of the surface of four second-layer epoxy steel bars 2 is respectively provided with an external anti-friction component 10 on the left and right sides, and the edges of the left and right sides of all first-layer epoxy steel bars 1 are respectively covered with a limited position handling component 9, and the bottom of all first-layer epoxy steel bars 1, the second-layer epoxy steel bars 2 and the steel bar reinforcement cross 5 is provided with a convenient installation welding frame component 11 , convenient for installation, the welding frame assembly 11 includes a U-shaped mounting frame A1101 and a U-shaped mounting frame B1102, and the left and right ends of the two U-shaped mounting frames A1101 and B1102 are respectively connected with a connecting rod A1103 and a connecting rod B1104, the top surface of the U-shaped mounting frame A1101 is arranged in an array with a plurality of limit columns A1105, the top surface of the U-shaped mounting frame B1102 is arranged in an array with a plurality of limit columns B1106, the top surface of the connecting rod A1103 is arranged in an array with a plurality of limit columns C1107, and the top surface of the connecting rod B1104 is arranged in an array with a plurality of limit columns C1108. A limiting column D1108, the limiting transport component 9 includes an elliptical limiting rod 901, and the left and right edges of the elliptical limiting rod 901 are respectively connected with a lifting ear A902 and a lifting ear B903, and the front and rear ends of the elliptical limiting rod 901 are respectively arranged with a plurality of limiting holes 904, and the top surface of the elliptical limiting rod 901 is arranged with a plurality of threaded holes 905, and the top of each threaded hole 905 is respectively provided with a threaded piece A906, and the external anti-friction component 10 includes an anti-friction block 1001, and the center of the top surface of the anti-friction block 1001 is provided with an arc groove 1002, and the anti-friction block 1001 is provided with a plurality of threaded holes 905. An external interface 1003 is provided inside, and threaded parts B1004 are respectively provided on the left and right sides of the bottom surface of the anti-friction block 1001. A steel bar can be placed between every two limiting columns arranged around the welding frame assembly 11 for convenient installation. After each steel bar is placed in position according to the adjusted spacing for convenient installation of the welding frame assembly 11, manual welding can be carried out. Using the mounting frame to install the welding mesh is more efficient and the spacing size is uniform. In addition, the limiting and transporting assemblies 9 arranged on both sides can be put on both sides for limiting after the welding mesh is completed, and when transporting, a crane or rope can be used to cover the lifting ears around for transportation or multiple bundling.

[0029] like Figure 5-Figure 7As shown, in this embodiment, the top of the steel reinforcement cross 5 is arranged with a plurality of first-layer epoxy steel bars 1, and the top surface of all the first-layer epoxy steel bars 1 is arranged with a plurality of second-layer epoxy steel bars 2. The four corners of the two first-layer epoxy steel bars 1 and the second-layer epoxy steel bars 2 are respectively wrapped with cross-shaped reinforcing wires 3. The edges of the four sides of the two first-layer epoxy steel bars 1 and the second-layer epoxy steel bars 2 are respectively arranged with a plurality of straight-line reinforcing wires 4. The structure of the first-layer epoxy steel bars 1 is the same as that of the second-layer epoxy steel bars 2. The steel bar 1 includes epoxy steel bars 6, and the outer surface of the epoxy steel bars 6 is provided with a plurality of reinforcement lines 7 in an arranged manner. The outer surface of the epoxy steel bars 6 is coated with an epoxy resin powder coating layer 8. The number of open welds at the intersections of the steel bar welded mesh shall not exceed 1% of the total number of intersections of the entire mesh, and the number of open welds on any one steel bar shall not exceed 0.5% of the total number of intersections on the steel bar. The intersections on the outermost steel bars of the welded mesh shall not be open welded, ensuring that there are no defects on the surface of the welded mesh that affect its use. It is inevitable that there are burrs, surface rust and partial vacancies in the steel bars caused by sampling, and the vacancies must be filled with corresponding steel bars.

[0030] like Figure 5-Figure 7 As shown, in this embodiment, the steel bar anti-corrosion treatment process is studied: the steel bar surface is sandblasted to make the cleanliness of the steel bar surface reach Sa2.5 level or above, the surface roughness reaches Rz25~100um, the steel bar is preheated at 50~60℃, and kept warm for 5~10 minutes, and the preheated and dried steel bar surface is electrostatically sprayed with epoxy resin powder coating, two groups of spray guns are used for reverse spiral spraying in sequence, and the spraying range overlaps. The static voltage of the spraying is 50~65KV, the static current is 62~80uA, the atomization pressure is 0.3~0.45MPa, the spraying distance is 150~200mm, and the two clean and preheated steel bars and steel bars are heated and cured : Cleaning and preheating the steel bars can ensure the effect of subsequent electrostatic spraying and improve the adhesion of the coating. By controlling the relevant parameters of electrostatic spraying, a uniform and dense anti-corrosion coating can be obtained, thereby improving the anti-corrosion performance of the steel bars. Prolonging the curing time can obtain a more stable anti-corrosion coating. Finally, the steel bars obtained after spraying are heated and cured. The heating temperature is 160-170°C and the heating time is 2-2.5 hours. The epoxy resin powder coating is designed to be composed of the following raw materials in parts by weight: 680 parts of epoxy resin, 200 parts of phenolic resin, 100 parts of titanium dioxide, 10 parts of leveling agent, 140 parts of barium sulfate, 150 parts of calcium carbonate, and 6 parts of organic pigments.

[0031] How this utility works:

[0032] First, the steel bar anti-corrosion treatment process is studied: the steel bar surface is sandblasted to make the steel bar surface cleanliness reach Sa2.5 level or above, and the surface roughness reaches Rz25-100um, and the steel bar is preheated at 50-60℃ and kept warm for 5-10 minutes; the preheated and dried steel bar surface is electrostatically sprayed with epoxy resin powder coating, and two groups of spray guns are used to spray in reverse spirals in sequence, with overlapping spraying ranges. The electrostatic voltage of the spraying is 50-65KV, the electrostatic current is 62-80uA, the atomization pressure is 0.3-0.45MPa, and the spraying distance is 150-20 0mm, heat and cure the steel bars obtained after spraying, the heating temperature is 160-170℃, the heating time is 2-2.5 hours, cleaning and preheating the steel bars can ensure the effect of subsequent electrostatic spraying, improve the adhesion of the coating, and obtain a uniform and dense anti-corrosion coating by controlling the relevant parameters of electrostatic spraying, thereby improving the anti-corrosion performance of the steel bars, and prolonging the curing time can obtain a more stable anti-corrosion coating, and then through the convenient installation of the limit columns set around the welding frame assembly 11, a steel bar can be placed between every two, and each steel bar can be placed according to the spacing adjusted for the convenience of installing the welding frame assembly 11. After the steel bars are in place, manual welding can be performed. Using the mounting frame to install the welded mesh is more efficient and has uniform spacing. The limit handling components 9 set on both sides can be set on both sides for limiting after the welding mesh is completed, and a crane or rope can be used to cover the surrounding lifting ears for transportation or multiple bundling during transportation. Finally, if the new welded mesh needs to be temporarily stored for a period of time after production, the external anti-friction component 10 can be covered with an anti-friction block 1001 to prevent the junction at the edge from being rubbed during transportation. Finally, the epoxy resin powder coating is designed with the following mass parts of raw materials Composition: 680 parts of epoxy resin, 200 parts of phenolic resin, 100 parts of titanium dioxide, 10 parts of leveling agent, 140 parts of barium sulfate, 150 parts of calcium carbonate, 6 parts of organic pigment. In addition, the number of open welds at the intersections of the steel bar welded mesh shall not exceed 1% of the total number of intersections of the entire mesh, and the number of open welds on any steel bar shall not exceed 0.5% of the total number of intersections on the steel bar. The intersections on the outermost steel bars of the welded mesh shall not be open welded to ensure that there are no defects on the surface of the welded mesh that affect its use. Burrs, surface rust and partial vacancies in steel bars caused by sampling are inevitable, and the vacancies must be filled with corresponding steel bars.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge, comprising a steel bar reinforcement cross (5), characterized in that: The top of the steel reinforcement cross (5) is provided with a plurality of first-layer epoxy steel bars (1) in an arranged form, and the top surface of all the first-layer epoxy steel bars (1) is provided with a plurality of second-layer epoxy steel bars (2) in an arranged form, wherein the surface centers of four of the second-layer epoxy steel bars (2) are provided with external anti-friction components (10) on the left and right sides, respectively, and the left and right edges of all the first-layer epoxy steel bars (1) are respectively covered with limited position handling components (9), and the bottoms of all the first-layer epoxy steel bars (1), the second-layer epoxy steel bars (2) and the steel reinforcement cross (5) are provided with convenient installation welding frame components (11); The convenient installation welding frame assembly (11) comprises a U-shaped mounting frame A (1101) and a U-shaped mounting frame B (1102), wherein a connecting rod A (1103) and a connecting rod B (1104) are respectively connected between the left and right end edges of the two U-shaped mounting frames A (1101) and the U-shaped mounting frame B (1102), wherein a plurality of limiting columns A (1105) are arranged on the top surface of the U-shaped mounting frame A (1101), a plurality of limiting columns B (1106) are arranged on the top surface of the U-shaped mounting frame B (1102), a plurality of limiting columns C (1107) are arranged on the top surface of the connecting rod A (1103), and a plurality of limiting columns D (1108) are arranged on the top surface of the connecting rod B (1104).

2. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 1 is characterized in that: The four corner intersections of the two first-layer epoxy steel bars (1) and the second-layer epoxy steel bars (2) are respectively wrapped with cross-shaped reinforcing iron wires (3), and the four edges of the surfaces of the two first-layer epoxy steel bars (1) and the second-layer epoxy steel bars (2) are respectively wrapped with a plurality of straight-line reinforcing iron wires (4) in an arranged manner.

3. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 1 is characterized in that: The structure of the first layer of epoxy steel bars (1) is the same as that of the second layer of epoxy steel bars (2), and the first layer of epoxy steel bars (1) comprises epoxy steel bars (6).

4. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 3 is characterized in that: The outer surface of the epoxy steel bar (6) is provided with a plurality of reinforcement lines (7) in an arranged manner, and the outer surface of the epoxy steel bar (6) is coated with an epoxy resin powder coating layer (8).

5. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 1 is characterized in that: The limiting transport assembly (9) comprises an elliptical limiting rod (901), the left and right edges of which are respectively connected to a lifting lug A (902) and a lifting lug B (903), and the front and rear ends of the elliptical limiting rod (901) are respectively provided with a plurality of limiting holes (904) arranged in an array.

6. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 5 is characterized in that: The top surface of the elliptical limiting rod (901) is provided with a plurality of threaded holes (905) in an arranged manner, and a threaded member A (906) is provided at the top of each of the threaded holes (905).

7. The highly corrosion-resistant double-layer epoxy steel bar welded mesh for a sea-crossing bridge according to claim 1 is characterized in that: The external anti-friction component (10) comprises an anti-friction block (1001), an arc groove (1002) is provided at the center of the top surface of the anti-friction block (1001), an external interface (1003) is provided inside the anti-friction block (1001), and screw parts B (1004) are respectively provided on the left and right sides of the bottom surface of the anti-friction block (1001).

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