Preparation method of corrosion-resistant thin-wall concrete filled steel tube electric pole and electric pole

Abstract

The invention belongs to the technical field of electric poles, and provides a preparation method of a corrosion-resistant thin-wall concrete-filled steel tube electric pole and the electric pole. Corrosion-resistant elements such as copper, phosphorus, chromium and nickel are stored in an outer steel tube, an inner steel tube, a flange plate and a flange plate cover plate which are made of weather-resistant steel; and meanwhile, after sand blasting, the surface energy of the steel is increased, then water mist spraying and drying circulation treatment are conducted, the steel is promoted to form a stable rust layer on the surface of a base body, corrosive media in air are prevented from permeating into the base body, and chemical process anti-corrosion modes such as hot-dip galvanizing or coating brushing are replaced. The process difficulty is simplified, the generation of a rust layer is stabilized, the problem that the electric pole needs to be coated with an anti-corrosion coating regularly for anti-corrosion maintenance in the later period is solved, and the process difficulty and the anti-corrosion cost are reduced; meanwhile, the flange plate cover plate is arranged at the position of the middle hole of the flange plate, sealing of the inner wall of the inner steel pipe is achieved, and the anti-corrosion treatment and maintenance procedures of the inner wall of the inner steel pipe are avoided in the mode that air isolation is conducted on the inner wall of the inner steel pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of electric poles, and in particular relates to a method for preparing a corrosion-resistant thin-walled steel tube concrete electric pole and the electric pole. Background Art

[0002] Steel tube concrete composite poles include solid steel tube concrete poles, thin-walled centrifugal steel tube concrete poles and hollow sandwich steel tube concrete poles. Compared with traditional concrete poles, solid steel tube concrete poles have the advantages of high bearing capacity, good plasticity and toughness, and good fire resistance. However, solid steel tube concrete poles are heavy and difficult to transport, and require on-site pouring of concrete, which leads to low efficiency, environmental pollution, and difficulty in ensuring quality. Thin-walled centrifugal steel tube concrete poles have the advantages of more open cross-section, greater bending stiffness, and hollow interior to save concrete compared to solid steel tube concrete poles. However, it was found during use that due to the self-shrinkage characteristics of ordinary concrete, the bonding between concrete and steel tubes is insufficient, gaps are prone to appear, and the overall performance is affected.

[0003] Hollow sandwich steel tube concrete poles have an additional inner steel tube compared to thin-walled centrifugal steel tube concrete poles, and have the advantages of high bending stiffness, light weight and good seismic performance. However, the steel tubes and flange parts in the hollow sandwich steel tube concrete poles currently need to be treated with anti-corrosion. Usually, the initial anti-corrosion is hot-dip galvanizing or brushing paint, especially the inner wall of the inner steel tube, which is difficult to treat and maintain with anti-corrosion paint, and it is necessary to regularly apply anti-corrosion paint for anti-corrosion maintenance in the later stage, which has complex processes and high anti-corrosion costs. In addition, in order to reduce the dead weight, realize factory prefabrication, and ensure the stability of the connection between the inner and outer steel tubes, both the inner and outer steel tubes need to be fully welded with stiffening ribs, resulting in complex processing technology and high processing costs. In summary, the current hollow sandwich steel tube concrete poles are restricted in application and promotion due to their complex process, poor anti-corrosion performance and high cost. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a method for preparing a corrosion-resistant thin-walled steel tube concrete pole and a pole. The outer steel tube, inner steel tube, flange and flange cover made of weathering steel contain corrosion-resistant elements such as copper, phosphorus, chromium and nickel. The exposed areas of the outer steel tube, inner steel tube, flange and flange cover are deformed after sandblasting, which promotes the diffusion of elements such as copper and chromium to the surface. At the same time, the surface energy of the steel increases after sandblasting. Then, after spraying water mist and drying cycle treatment, the steel is prompted to quickly form a stable rust layer with strong adhesion and density on the surface of the substrate, which can effectively prevent corrosive media in the air from corrosive media. The rust-resistant steel pipe penetrates into the matrix, replacing the initial stage of hot-dip galvanizing or brushing paint and other chemical anti-corrosion methods for the outer steel pipe, inner steel pipe, flange and flange cover, simplifying the process difficulty and the formation of a dense rust layer, solving the problem of regular anti-corrosion maintenance of the poles in the later stage by brushing anti-corrosion paint, reducing the process difficulty and anti-corrosion cost; at the same time, a flange cover is provided at the middle hole of the flange to achieve sealing of the inner wall of the inner steel pipe. By isolating the inner wall of the inner steel pipe from air, the anti-corrosion treatment and maintenance procedures of the inner wall of the inner steel pipe are avoided, further reducing the process difficulty and anti-corrosion cost.

[0005] In order to achieve the above-mentioned purpose, in the first aspect, the present invention provides a method for preparing a corrosion-resistant thin-walled steel tube concrete pole, which adopts the following technical scheme:

[0006] A method for preparing a corrosion-resistant thin-walled steel tube concrete pole, comprising:

[0007] After the outer steel pipe and the inner steel pipe are coaxially arranged, the ends of the outer steel pipe and the inner steel pipe are connected by a flange;

[0008] pouring concrete into the interlayer between the outer steel pipe and the inner steel pipe;

[0009] A flange cover plate is arranged at the middle hole of the flange;

[0010] The outer steel pipe, the inner steel pipe, the flange and the flange cover are all made of weathering steel; the exposed areas of the outer steel pipe, the inner steel pipe, the flange and the flange cover are subjected to rust layer stabilization treatment by a cyclic operation of sand blasting, spraying water mist and drying.

[0011] Furthermore, flange stiffening ribs are arranged between the outer surface of the outer steel pipe and the flange; the flange stiffening ribs are made of weathering steel; and the exposed areas of the flange stiffening ribs are subjected to rust layer stabilization treatment by a cyclic operation of sandblasting, spraying water mist and drying.

[0012] Furthermore, a plurality of long holes are opened along the circumference of the inner steel pipe and the outer steel pipe, and flanges are arranged in the long holes to penetrate the stiffening ribs; the flanges are respectively penetrated through the stiffening ribs to be connected to the inner steel pipe, the outer steel pipe and the flange; the flanges are penetrated through the stiffening ribs using weathering steel; the exposed areas of the flanges penetrating the stiffening ribs are subjected to rust layer stabilization treatment by a cyclic operation of sand blasting, spraying water mist and drying.

[0013] Furthermore, the sand material used for sandblasting is 8# to 16# brown corundum sand, and the compressed air pressure during sandblasting is 0.1 to 0.5 MPa; the water mist spraying time is 10 to 30 minutes, the interval is 2 to 4 hours, and the number of cycles is 3 to 10 times.

[0014] Furthermore, the flange stiffening ribs and the flange penetrating stiffening ribs are staggeredly distributed in the circumferential direction.

[0015] Furthermore, a plurality of flange stiffening ribs and a plurality of flanges penetrating the stiffening ribs are evenly arranged in the circumferential direction.

[0016] Furthermore, a plurality of outer steel pipe stiffening ribs are welded axially on the inner wall of the outer steel pipe.

[0017] Furthermore, the outer steel pipe stiffening rib is welded to the inner wall of the outer steel pipe by intermittent welding.

[0018] Furthermore, the outer steel pipe stiffening ribs are made of threaded steel.

[0019] Furthermore, a plurality of inner steel pipe stiffening ribs are welded axially on the outer wall of the inner steel pipe.

[0020] Furthermore, the inner steel pipe stiffening rib is welded to the outer wall of the inner steel pipe by intermittent welding.

[0021] Furthermore, the inner steel pipe stiffening ribs are made of threaded steel.

[0022] Furthermore, the concrete adopts modified magnesium oxysulfate concrete.

[0023] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a corrosion-resistant thin-walled steel tube concrete pole, which adopts the following technical solution:

[0024] A corrosion-resistant thin-walled steel tube concrete pole, obtained by the corrosion-resistant thin-walled steel tube concrete pole preparation method as described in the first aspect, comprising an outer steel tube and an inner steel tube arranged coaxially, and concrete arranged in an interlayer between the outer steel tube and the inner steel tube;

[0025] Flanges are provided at the ends of the outer steel pipe and the inner steel pipe; a flange cover is provided at the middle hole of the flange; the outer steel pipe, the inner steel pipe, the flange and the flange cover are all made of weathering steel.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, the outer steel pipe, the inner steel pipe, the flange and the flange cover are all made of weathering steel, and the exposed areas of the outer steel pipe, the inner steel pipe, the flange and the flange cover are subjected to rust stabilization treatment by sandblasting, followed by cyclic spraying of water mist and drying. The outer steel pipe, the inner steel pipe, the flange and the flange cover made of weathering steel contain corrosion-resistant elements such as copper, phosphorus, chromium and nickel, and the exposed areas of the outer steel pipe, the inner steel pipe, the flange and the flange cover are deformed after sandblasting, which promotes the diffusion of elements such as copper and chromium to the surface. At the same time, sandblasting increases the surface energy of the steel, and later, after spraying water mist and drying cycles, the steel quickly forms a stable layer with strong adhesion and density on the surface of the substrate. The fixed rust layer can effectively prevent the corrosive media in the air from penetrating into the matrix, replacing the chemical anti-corrosion methods such as hot-dip galvanizing or brushing paint on the outer steel pipe, inner steel pipe, flange and flange cover in the initial stage, simplifying the process difficulty and stabilizing the formation of the rust layer, solving the problem of regular anti-corrosion maintenance of the poles in the later stage by brushing anti-corrosion paint, reducing the process difficulty and anti-corrosion cost; at the same time, by setting a flange cover at the middle hole of the flange, the inner wall of the inner steel pipe is sealed, and by isolating the inner wall of the inner steel pipe from air, the anti-corrosion treatment and maintenance procedures of the inner wall of the inner steel pipe are avoided, further reducing the process difficulty and anti-corrosion cost, which is conducive to the application and promotion of hollow sandwich steel tube concrete poles.

[0028] 2. In the present invention, the outer steel pipe stiffening ribs and the inner steel pipe stiffening ribs are respectively arranged on the outer steel pipe and the inner steel pipe by intermittent welding. There is no need to perform long-term welding on the inner wall of the outer steel pipe and the outer wall of the inner steel pipe, thereby reducing the process complexity of fully welded stiffening ribs. At the same time, with the help of the micro-expansion characteristics of modified magnesium oxysulfate concrete, the adhesion strength between the outer steel pipe stiffening ribs, the inner steel pipe stiffening ribs, the outer steel pipe and the inner steel pipe can be improved, thereby compensating for the connection strength reduced by replacing full welding. On the basis of ensuring the connection strength between the stiffening ribs and the steel pipe and the bending resistance of the pole, the welding process requirements are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0030] Figure 1It is a schematic diagram of the structure of the electric pole of the present invention;

[0031] Among them, 1. outer steel pipe; 2. outer steel pipe stiffening ribs; 3. flange; 4. flange stiffening ribs; 5. flange through stiffening ribs; 6. inner steel pipe; 7. inner steel pipe stiffening ribs; 8. flange cover plate; 9. concrete. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0034] Embodiment 1:

[0035] The pole is one of the main load-bearing components of the transmission line. It is used to support the overhead wires and ensure the stability and safety of the power lines. It occupies an extremely important position in the power grid. The transmission line pole has developed from the original wooden pole to cement pole, steel angle steel tower, steel pipe pole, and then composite pole. Urban transmission lines generally use angle steel towers, cables and steel pipe poles. Angle steel towers are strong and reliable, with a long service life, but they have large root openings, large floor space, large steel consumption and high cost. Cables have the advantages of small footprint and high reliability, but the disadvantages are large one-time investment, high cost, inflexible operation, difficult to find fault points, and complex construction process. Steel pipe poles have the characteristics of beautiful appearance, small root opening, small footprint, and easy implementation. However, the stability problem of steel pipe poles is prominent, and they are prone to local buckling and sudden failure, and their cost is relatively high.

[0036] In order to save steel, reduce costs, and achieve aesthetic and long-lasting effects, a steel tube concrete composite pole was proposed. The hollow sandwich steel tube concrete pole in the steel tube concrete composite pole has an additional inner steel tube compared to the thin-walled centrifugal steel tube concrete pole, and has the advantages of high bending stiffness, light weight, and good seismic performance; however, as recorded in the background technology, the current hollow sandwich steel tube concrete pole is restricted in application and promotion due to its complex process, poor corrosion resistance and high cost.

[0037] Based on this, this embodiment provides a method for preparing a corrosion-resistant thin-walled steel tube concrete pole, which simplifies the processing technology and saves the cost of anti-corrosion maintenance while ensuring the load-bearing performance of the pole remains unchanged. The corresponding method is aimed at the problem that the inner and outer steel tubes of the hollow sandwich steel tube concrete poles prefabricated in the existing factory need to be fully welded with stiffening ribs, and the poles need to be anti-corrosion treated, which has complex processes and high processing costs. Figure 1As shown, this embodiment also provides a corrosion-resistant thin-walled steel tube concrete pole, including an outer steel tube 1, an outer steel tube stiffening rib 2, a flange 3, a flange stiffening rib 4, a flange through-stiffening rib 5, an inner steel tube 6, an inner steel tube stiffening rib 7, a flange cover plate 8 and concrete 9.

[0038] The method for preparing the corrosion-resistant thin-walled steel tube concrete pole comprises:

[0039] S1. After the outer steel pipe 1 and the inner steel pipe 6 are coaxially arranged, the ends of the outer steel pipe 1 and the inner steel pipe 6 are connected by a flange 3;

[0040] S2, pouring concrete 9 into the interlayer between the outer steel pipe 1 and the inner steel pipe 6; optionally, when pouring the concrete 9, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete 9 is dense and does not have hollows;

[0041] S3, a flange cover plate 8 is arranged at the middle hole of the flange 3;

[0042] S4, the outer steel pipe 1, the inner steel pipe 6, the flange 3 and the flange cover 8 are all made of weathering steel; the exposed areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3 and the flange cover 8 are subjected to rust layer stabilization treatment by adopting a cyclic operation method of sand blasting, spraying water mist and drying.

[0043] The steel pipe part of the hollow sandwich steel tube concrete pole can be made of carbon steel such as Q235, Q355, Q420 and Q690, or weathering steel. Carbon steel needs to be treated with anti-corrosion due to its poor corrosion resistance. Usually, the initial anti-corrosion is hot-dip galvanizing or brushing paint. In the later stage, it needs to be regularly painted with anti-corrosion paint for anti-corrosion maintenance, and the anti-corrosion cost is high. When weathering steel is exposed to the atmosphere, it initially forms a loose rust layer like ordinary carbon steel. As time goes by, a dense rust layer will be formed next to the steel matrix. This dense rust layer prevents the matrix from being further eroded by the external environment, thereby achieving the purpose of no painting and long-term corrosion resistance; it takes 3 to 10 years for weathering steel to form a protective rust layer in the natural environment, and in the early stage of use, the rust liquid will drip and scatter, causing environmental pollution and affecting the appearance. It is usually necessary to stabilize the rust layer. Based on this, in this embodiment, the outer steel pipe 1, the inner steel pipe 6, the flange 3 and the flange cover 8 made of weathering steel contain corrosion-resistant elements such as copper, phosphorus, chromium and nickel, and the exposed areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3 and the flange cover 8 are deformed after sandblasting, which promotes the diffusion of elements such as copper and chromium to the surface. At the same time, sandblasting increases the surface energy of the steel. Later, after spraying water mist and drying cycle treatment, the steel quickly forms a layer of stable rust layer with strong adhesion and density on the surface of the substrate, which can effectively prevent the corrosive medium in the air from penetrating into the substrate, replacing the initial stage of the outer steel pipe 1, The chemical anti-corrosion methods such as hot-dip galvanizing or brush coating on the inner steel pipe 6, the flange 3 and the flange cover 8 simplify the process difficulty and stabilize the formation of the rust layer, which solves the problem of regularly painting the poles with anti-corrosion paint for anti-corrosion maintenance in the later stage, and reduces the process difficulty and anti-corrosion cost; at the same time, by arranging the flange cover 8 at the middle hole of the flange 3, the inner wall of the inner steel pipe 6 is sealed, and by isolating the inner wall of the inner steel pipe 6 from air, the anti-corrosion treatment and maintenance procedures of the inner wall of the inner steel pipe 6 are avoided, which further reduces the process difficulty and anti-corrosion cost, and is conducive to the application and promotion of hollow sandwich steel tube concrete poles.

[0044] At the same time, in this embodiment, a flange stiffening rib 4 is provided between the outer surface of the outer steel pipe 1 and the flange 3; the flange stiffening rib 4 is made of weathering steel; the exposed area of ​​the flange stiffening rib 4 is subjected to rust stabilization treatment by adopting a cyclic operation method of sandblasting, spraying water mist and drying. In addition, a plurality of long holes are opened along the circumference of the outer steel pipe 1, and flange penetrating stiffening ribs 5 are provided in the long holes; the two ends of the flange penetrating stiffening rib 5 are respectively connected to the outer surface of the outer steel pipe 1, the inner surface of the inner steel pipe 6 and the flange 3; the flange penetrating stiffening rib 5 is made of weathering steel; the exposed area of ​​the flange penetrating stiffening rib 5 is subjected to rust stabilization treatment by adopting a cyclic operation method of sandblasting, spraying water mist after sandblasting and drying.

[0045] The flange stiffening ribs 4 and the flange through-stiffening ribs 5 are made of weathering steel and are subjected to rust layer stabilization treatment, thereby reducing the difficulty and cost of the anti-corrosion process for the flange stiffening ribs 4 and the flange through-stiffening ribs 5.

[0046] In this embodiment, optionally, 8# to 16# brown corundum sand is used as the sand material during sandblasting, and the compressed air pressure during sandblasting is 0.1 to 0.5 MPa; the water mist spraying time is 10 to 30 minutes, the interval is 2 to 4 hours, and the number of cycles is 3 to 10 times.

[0047] In this embodiment, optionally, the flange stiffening ribs 4 and the flange through stiffening ribs 5 are staggered in the circumferential direction. A plurality of flange stiffening ribs 4 and a plurality of flange through stiffening ribs 5 are evenly arranged in the circumferential direction.

[0048] In this embodiment, multiple outer steel pipe stiffening ribs 2 are welded axially on the inner wall of the outer steel pipe 1; multiple inner steel pipe stiffening ribs 7 are welded axially on the outer wall of the inner steel pipe 6. Optionally, the outer steel pipe stiffening ribs 2 are welded to the inner wall of the outer steel pipe 1 by intermittent welding; the outer steel pipe stiffening ribs 2 are made of threaded steel. The inner steel pipe stiffening ribs 7 are welded to the outer wall of the inner steel pipe 6 by intermittent welding. The inner steel pipe stiffening ribs 7 are made of threaded steel.

[0049] In this embodiment, the concrete 9 adopts modified magnesium oxysulfide concrete. Specifically, the outer steel pipe stiffening rib 2 and the inner steel pipe stiffening rib 7 are respectively arranged on the outer steel pipe 1 and the inner steel pipe 6 by intermittent welding, and there is no need to perform long-term welding at the inner wall of the outer steel pipe 1 and the outer wall of the inner steel pipe 6, which reduces the process complexity of full welding stiffening ribs; at the same time, with the help of the micro-expansion characteristics of modified magnesium oxysulfide concrete, the adhesion strength between the outer steel pipe stiffening rib 2, the inner steel pipe stiffening rib 7, the outer steel pipe 1 and the inner steel pipe 6 can be improved, making up for the connection strength reduced by replacing full welding; on the basis of ensuring the connection strength between the stiffening rib and the steel pipe and the bending resistance of the pole, the welding process requirements are reduced.

[0050] Optionally, the corrosion-resistant thin-walled steel tube concrete pole includes two upper and lower sections of steel-concrete composite pole bodies, and the length of each section of the pole body is 7m.

[0051] Optionally, the outer steel pipe 1 is made of Q355NH weathering steel; the maximum diameter of the outer steel pipe 1 is 692 mm, and the thickness of the outer steel pipe 1 is 6 mm. The inner steel pipe 6 is made of Q355, Q420 or weathering steel; the maximum diameter of the inner steel pipe 6 is 544 mm, the thickness of the inner steel pipe 6 is 6 mm, and the length of the inner steel pipe is 7 m.

[0052] Optionally, the flange 3 is a flat flange, and the material of the flange 3 is Q355GNH weathering steel; the flange stiffening ribs 4 and the flange through-stiffening ribs 5 are both made of Q355GNH weathering steel; the flange cover plate 8 is made of Q355NH weathering steel.

[0053] Optionally, the outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are made of HRB400 threaded steel with a specification of Φ12mm-Φ40mm. Three outer steel pipe stiffening ribs 2 are evenly welded inside the outer steel pipe 1, the length of the outer steel pipe stiffening ribs 2 is equal to that of the outer steel pipe 1, and the angle between the two outer steel pipe stiffening ribs 2 is 120 degrees; three inner steel pipe stiffening ribs 7 are evenly welded on the outer surface of the inner steel pipe 6, the length of the inner steel pipe stiffening ribs 7 is equal to that of the inner steel pipe 6, and the angle between the two inner steel pipe stiffening ribs 7 is 120 degrees; the outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are evenly staggered, and the angle between adjacent outer steel pipe stiffening ribs 2 and inner steel pipe stiffening ribs 7 is 60 degrees.

[0054] Optionally, the concrete 9 is a lightweight high-strength concrete, which is a modified magnesium oxysulfide concrete, and the existing modified magnesium oxysulfide cement can be used; the modified magnesium oxysulfide concrete has a micro-expansion characteristic, and the volume expansion is 0.8‰; the fluidity of the modified magnesium oxysulfide concrete can reach more than 300mm, and the initial setting time is 300min.

[0055] Embodiment 2:

[0056] Based on Example 1, this example provides a method for preparing a long-lasting corrosion-resistant thin-walled steel tube concrete pole, including cutting, punching, rolling, welding outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7, welding outer steel tube 1 and inner steel tube 6, assembling outer steel tube 1 and inner steel tube 6, welding flange stiffening ribs 4 and flange through-stiffening ribs 5, welding flange 3 and outer steel tube 1 and inner steel tube 6, pouring concrete 9, and welding flange cover plate 8.

[0057] Optionally, the outer steel pipe stiffening rib 2 and the inner steel pipe stiffening rib 7 are welded by intermittent welding, with a welding rate of 60%; other welds are all fully welded. The concrete 9 is poured by a grouting pump; when the concrete 9 is poured, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete is dense and does not have hollows.

[0058] The areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4, the flange through-stiffening rib 5 and the flange cover plate 8 exposed to the atmospheric environment are subjected to rust layer stabilization treatment by means of sandblasting, water mist spraying and drying processes; during the rust layer stabilization treatment, it is optional to first perform sandblasting, and then perform cyclic water mist spraying and drying treatment; the sand material for sandblasting is 8# brown corundum sand, and the compressed air pressure is 0.1MPa; the water mist spraying time is 10min, the interval is 2h, and the number of cycles is 10 times.

[0059] The pole prepared in this embodiment can be used for 10kV double-circuit power transmission lines. Compared with the traditional factory-prefabricated hollow sandwich steel tube concrete pole, the processing cost is reduced by 28%. Combined with the saved cost of brushing anti-corrosion paint, the total cost of the pole is reduced by 7.6%.

[0060] Embodiment 3:

[0061] Based on Example 1 and Example 2, this embodiment provides a long-lasting corrosion-resistant thin-walled steel tube concrete pole, including an outer steel tube 1, outer steel tube stiffening ribs 2, a flange 3, flange stiffening ribs 4, flange through stiffening ribs 5, an inner steel tube 6, inner steel tube stiffening ribs 7, a flange cover plate 8 and concrete 9.

[0062] The long-lasting corrosion-resistant thin-walled steel tube concrete pole comprises four sections of steel-concrete composite pole bodies, and the four sections of the steel-concrete composite pole bodies are respectively 9m, 8m, 8m and 9m.

[0063] The outer steel pipe 1 and the inner steel pipe 6 are placed concentrically, and the outer steel pipe 1 and the inner steel pipe 6 are welded together through the flange 3, and the middle layer between the outer steel pipe 1 and the inner steel pipe 6 is poured with lightweight high-strength concrete.

[0064] The outer steel pipe 1 is made of Q355NH weathering steel; the maximum diameter of the outer steel pipe 1 is 1088mm, of which the thickness of the outer steel pipe 1 of the two sections of the composite rod is 8mm, and the thickness of the outer steel pipe 1 of the other two sections of the composite rod is 6mm. The inner steel pipe 6 is made of Q355; the maximum diameter of the inner steel pipe 6 is 910mm, and the thickness of the inner steel pipe 6 is 6mm.

[0065] The flange 3 is a flat flange, and the material of the flange 3 is Q355GNH weathering steel; the flange stiffening ribs 4 and the flange through-stiffening ribs 5 are both made of Q355GNH weathering steel; the flange cover plate 8 is made of Q355NH weathering steel.

[0066] The outer steel pipe stiffening rib 2 is made of HRB400 threaded steel with a specification of Φ36; the inner steel pipe stiffening rib 7 is made of HRB400 threaded steel with a specification of Φ36mm. Three outer steel pipe stiffening ribs 2 are evenly welded inside the outer steel pipe 1. The length of the outer steel pipe stiffening rib 2 is the same as that of the outer steel pipe 1, and the angle between the two outer steel pipe stiffening ribs 2 is 120 degrees. Three inner steel pipe stiffening ribs 7 are evenly welded on the outer surface of the inner steel pipe 6. The length of the inner steel pipe stiffening rib 7 is the same as that of the inner steel pipe 6, and the angle between the two inner steel pipe stiffening ribs 7 is 120 degrees.

[0067] The outer steel tube stiffening ribs 2 and the inner steel tube stiffening ribs 7 are evenly staggered and assembled, and the angle between adjacent outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7 is 60 degrees.

[0068] The lightweight high-strength concrete is modified magnesium oxysulfate concrete; the modified magnesium oxysulfate concrete has a micro-expansion characteristic, and the volume expansion is 1.5‰; the fluidity of the modified magnesium oxysulfate concrete can reach 280mm, and the initial setting time is 240min.

[0069] Corresponding to the long-term corrosion-resistant thin-walled steel tube concrete pole, the present embodiment also provides a preparation method of the long-term corrosion-resistant thin-walled steel tube concrete pole, including cutting, punching, rolling, welding outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7, welding outer steel tube 1 and inner steel tube 6, assembling outer steel tube 1 and inner steel tube 6, welding flange stiffening ribs 4 and flange through stiffening ribs 5, welding flange 3 and outer steel tube 1 and inner steel tube 6, pouring concrete 9, and welding flange cover plate 8.

[0070] Optionally, the outer steel pipe stiffening rib 2 and the inner steel pipe stiffening rib 7 are welded by intermittent welding with a welding rate of 50%; and the other welds are all welded by full welding.

[0071] The concrete 9 is poured using a grouting pump; when the concrete 9 is poured, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete is dense and does not have hollows.

[0072] The areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4, the flange through-stiffening rib 5 and the flange cover plate 8 exposed to the atmospheric environment are subjected to rust layer stabilization treatment by means of sandblasting, water mist spraying and drying processes; during the rust layer stabilization treatment, it is optional to first sandblast, then cycle through water mist spraying and drying treatment, the water mist spraying time interval is 4 hours, and the number of cycles is 5 times; the sand material for sandblasting is 16# brown corundum sand, and the compressed air pressure is 0.3MPa.

[0073] And / or, during the rust layer stabilization treatment, optionally, sandblasting is performed first, and then water mist spraying and drying are performed in a cycle; the sand material for sandblasting is 16# brown corundum sand, and the compressed air pressure is 0.3MPa; the water mist spraying time is 20min, the interval is 4h, and the number of cycles is 5 times.

[0074] The prepared long-lasting corrosion-resistant thin-walled steel tube concrete poles can be used for 110kV double-circuit transmission lines. Compared with traditional factory-prefabricated hollow sandwich steel tube concrete poles, the processing cost is reduced by 32%. Combined with the saved anti-corrosion coating costs, the total cost of the poles is reduced by 9.8%.

[0075] Embodiment 4:

[0076] Based on Example 1, Example 2 and Example 3, this embodiment provides a long-lasting corrosion-resistant thin-walled steel tube concrete pole, including an outer steel tube 1, outer steel tube stiffening ribs 2, a flange 3, flange stiffening ribs 4, flange through stiffening ribs 5, an inner steel tube 6, inner steel tube stiffening ribs 7, a flange cover plate 8 and concrete 9.

[0077] The long-lasting corrosion-resistant thin-walled steel tube concrete pole is a single-section steel-concrete composite pole body with a pole body length of 3.2m; the outer steel tube 1 and the inner steel tube 6 are placed concentrically, and the outer steel tube 1 and the inner steel tube 6 are welded together through the flange 3, and the interlayer between the outer steel tube 1 and the inner steel tube 6 is cast with lightweight high-strength concrete.

[0078] The outer steel pipe 1 is made of Q355NH weathering steel; the maximum diameter of the outer steel pipe 1 is 462mm, and the thickness of the outer steel pipe 1 is 3mm. The inner steel pipe 6 is made of Q355; the maximum diameter of the inner steel pipe 6 is 372mm, and the thickness of the inner steel pipe 6 is 3mm.

[0079] The flange 3 is a flat flange, and the material of the flange 3 is Q355GNH weathering steel; the flange stiffening ribs 4 and the flange through-stiffening ribs 5 are both made of Q355GNH weathering steel; the flange cover plate 8 is made of Q355NH weathering steel.

[0080] The outer steel pipe stiffening rib 2 is made of HRB400 threaded steel with a specification of Φ12mm; the inner steel pipe stiffening rib 7 is made of HRB400 threaded steel with a specification of Φ12mm. Three outer steel pipe stiffening ribs 2 are evenly welded inside the outer steel pipe 1. The length of the outer steel pipe stiffening rib 2 is the same as that of the outer steel pipe 1, and the angle between the two outer steel pipe stiffening ribs 2 is 120 degrees. Three inner steel pipe stiffening ribs 7 are evenly welded on the outer surface of the inner steel pipe 6. The length of the inner steel pipe stiffening rib 7 is the same as that of the inner steel pipe 6, and the angle between the two inner steel pipe stiffening ribs 7 is 120 degrees. The outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are evenly staggered, and the angle between adjacent outer steel pipe stiffening ribs 2 and inner steel pipe stiffening ribs 7 is 60 degrees.

[0081] The lightweight high-strength concrete is modified magnesium oxysulfate concrete; the modified magnesium oxysulfate concrete has a micro-expansion characteristic, and the volume expansion is 1.8‰; the fluidity of the modified magnesium oxysulfate concrete can reach 270mm, and the initial setting time is 210min.

[0082] Corresponding to the long-term corrosion-resistant thin-walled steel tube concrete pole, the present embodiment also provides a preparation method of the long-term corrosion-resistant thin-walled steel tube concrete pole, including cutting, punching, rolling, welding outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7, welding outer steel tube 1 and inner steel tube 6, assembling outer steel tube 1 and inner steel tube 6, welding flange stiffening ribs 4 and flange through stiffening ribs 5, welding flange 3 and outer steel tube 1 and inner steel tube 6, pouring concrete 9, and welding flange cover plate 8.

[0083] Optionally, the outer steel pipe stiffening rib 2 and the inner steel pipe stiffening rib 7 are welded by intermittent welding, with a welding rate of 40%; and the other welds are all welded by full welding.

[0084] The concrete 9 is poured using a grouting pump; when the concrete 9 is poured, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete is dense and does not have hollows.

[0085] The areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4, the flange through-stiffening rib 5 and the flange cover plate 8 exposed to the atmospheric environment are subjected to rust layer stabilization treatment by means of sandblasting, water mist spraying and drying processes; during the rust layer stabilization treatment, optionally, 8# brown corundum sand is used as the sand material for sandblasting, and the compressed air pressure is 0.5MPa; the water mist spraying time is 30min, the interval is 3h, and the number of cycles is 3 times.

[0086] The prepared long-lasting corrosion-resistant thin-walled steel tube concrete rod has a 36% lower processing cost compared with the traditional factory-prefabricated hollow sandwich steel tube concrete rod. Combined with the saved anti-corrosion coating cost, the total cost is reduced by 10.9%; the prepared long-lasting corrosion-resistant thin-walled steel tube concrete rod has a maximum axial compression bearing capacity of 4580kN, and the axial compression failure form is the circumferential bulging of the steel at the lower part of the top plate.

[0087] This embodiment also provides a thin-walled steel tube concrete pole as a comparative example, which includes an outer steel tube 1, outer steel tube stiffening ribs 2, flanges 3, flange stiffening ribs 4, flange through stiffening ribs 5, inner steel tube 6, inner steel tube stiffening ribs 7 and concrete 9.

[0088] The thin-walled steel tube concrete pole consists of a single-section steel-concrete composite pole body with a pole body length of 3.2m; the outer steel tube 1 and the inner steel tube 6 are placed concentrically, and the outer steel tube 1 and the inner steel tube 6 are welded together through the flange 3, and the middle layer between the outer steel tube 1 and the inner steel tube 6 is cast with lightweight high-strength concrete.

[0089] The outer steel pipe 1 is made of Q355B steel; the maximum diameter of the outer steel pipe 1 is 462 mm, and the thickness of the outer steel pipe 1 is 3 mm. The inner steel pipe 6 is made of Q355B steel; the maximum diameter of the inner steel pipe 6 is 372 mm, and the thickness of the inner steel pipe 6 is 3 mm.

[0090] The flange 3 is a flat flange, and the material of the flange 3 is Q355B steel; the flange stiffening ribs 4 and the flange through-stiffening ribs 5 are both made of Q355B steel; the flange cover plate 8 is made of Q355B steel.

[0091] The outer steel pipe stiffening rib 2 is made of Q355B steel bar with a specification of 3mm×28mm; the inner steel pipe stiffening rib 7 is made of Q355B steel bar with a specification of 3mm×28mm;

[0092] Four outer steel pipe stiffening ribs 2 are uniformly welded inside the outer steel pipe 1, the length of the outer steel pipe stiffening ribs 2 is equal to that of the outer steel pipe 1, and the angle between two outer steel pipe stiffening ribs 2 is 90 degrees; four inner steel pipe stiffening ribs 7 are uniformly welded on the outer surface of the inner steel pipe 6, the length of the inner steel pipe stiffening ribs 7 is equal to that of the inner steel pipe 6, and the angle between two inner steel pipe stiffening ribs 7 is 90 degrees. The outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are uniformly staggered and assembled, and the angle between adjacent outer steel pipe stiffening ribs 2 and inner steel pipe stiffening ribs 7 is 45 degrees.

[0093] The lightweight high-strength concrete is modified magnesium oxysulfate concrete; the modified magnesium oxysulfate concrete has a micro-expansion characteristic, and the volume expansion is 1.8‰; the fluidity of the modified magnesium oxysulfate concrete can reach 270mm, and the initial setting time is 210min.

[0094] A corresponding method for preparing a long-lasting corrosion-resistant thin-walled steel tube concrete pole is provided, including cutting, punching, rolling, welding outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7, welding outer steel tube 1 and inner steel tube 6, assembling outer steel tube 1 and inner steel tube 6, welding flange stiffening ribs 4 and flange penetrating stiffening ribs 5, hot-dip galvanizing for corrosion protection and pouring concrete.

[0095] Optionally, full welding is used for welding the outer steel pipe stiffening rib 2, the inner steel pipe stiffening rib 7 and the welds at other locations.

[0096] The concrete 9 is poured using a grouting pump; when the concrete 9 is poured, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete is dense and does not have hollows.

[0097] The outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4 and the flange penetrating stiffening rib 5 are anti-corrosion-resistant by hot-dip galvanizing.

[0098] The thin-walled steel tube concrete rod prepared in the comparative example has a maximum axial pressure bearing capacity of 4570 kN, and the axial pressure failure mode is circumferential buckling of the steel ring at the lower part of the top plate. The axial pressure bearing capacity of Example 4 is equivalent to that of the comparative example.

[0099] Embodiment 5:

[0100] Based on Example 1, Example 2, Example 3 and Example 4, this embodiment provides a long-lasting corrosion-resistant thin-walled steel tube concrete pole, including an outer steel tube 1, outer steel tube stiffening ribs 2, a flange 3, flange stiffening ribs 4, flange through-stiffening ribs 5, an inner steel tube 6, inner steel tube stiffening ribs 7, a flange cover plate 8 and concrete 9.

[0101] The long-lasting corrosion-resistant thin-walled steel tube concrete pole is a single-section steel-concrete composite pole with a pole length of 2.3m;

[0102] The outer steel pipe 1 and the inner steel pipe 6 are placed concentrically, and the outer steel pipe 1 and the inner steel pipe 6 are welded together through the flange 3, and the interlayer between the outer steel pipe 1 and the inner steel pipe 6 is cast with lightweight high-strength concrete.

[0103] The outer steel pipe 1 is made of Q355NH weathering steel; the maximum diameter of the outer steel pipe 1 is 462 mm, and the thickness of the outer steel pipe 1 is 6 mm. The inner steel pipe 6 is made of Q355; the maximum diameter of the inner steel pipe 6 is 372 mm, and the thickness of the inner steel pipe 6 is 3 mm.

[0104] The flange 3 is a flat flange, and the material of the flange 3 is Q355GNH weathering steel; the flange stiffening ribs 4 and flange through-stiffening ribs 5 are both made of Q355GNH weathering steel; the flange cover plate 8 is made of Q355NH weathering steel. The outer steel pipe stiffening ribs 2 are made of HRB400 threaded steel with a specification of Φ12mm; the inner steel pipe stiffening ribs 5 are made of HRB400 threaded steel with a specification of Φ12mm.

[0105] Three outer steel pipe stiffening ribs 2 are uniformly welded inside the outer steel pipe 1, the length of the outer steel pipe stiffening rib 2 is equal to that of the outer steel pipe 1, and the angle between two outer steel pipe stiffening ribs 2 is 120 degrees. Three inner steel pipe stiffening ribs 7 are uniformly welded on the outer surface of the inner steel pipe 6, the length of the inner steel pipe stiffening rib 7 is equal to that of the inner steel pipe 6, and the angle between two inner steel pipe stiffening ribs 7 is 120 degrees. The outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are uniformly staggered and assembled, and the angle between adjacent outer steel pipe stiffening ribs 2 and inner steel pipe stiffening ribs 7 is 60 degrees.

[0106] The lightweight high-strength concrete is modified magnesium oxysulfate concrete; the modified magnesium oxysulfate concrete has a micro-expansion characteristic, and the volume expansion is 1.8‰; the fluidity of the modified magnesium oxysulfate concrete can reach 270mm, and the initial setting time is 210min.

[0107] Corresponding to the long-term corrosion-resistant thin-walled steel tube concrete pole, the present embodiment also provides a preparation method of the long-term corrosion-resistant thin-walled steel tube concrete pole, including cutting, punching, rolling, welding outer steel tube stiffening ribs 2 and inner steel tube stiffening ribs 7, welding outer steel tube 1 and inner steel tube 6, assembling outer steel tube 1 and inner steel tube 6, welding flange stiffening ribs 4 and flange through stiffening ribs 5, welding flange 3 and outer steel tube 1 and inner steel tube 6, pouring concrete 9, and welding flange cover plate 8.

[0108] Optionally, the outer steel pipe stiffening rib 2 and the inner steel pipe stiffening rib 7 are welded by intermittent welding, with a welding rate of 45%; and the other welds are all welded by full welding.

[0109] The concrete 9 is poured using a grouting pump; when the concrete 9 is poured, a vibrating pump or a vibrating table is used for vibrating to ensure that the concrete is dense and does not have hollows.

[0110] The areas of the outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4, the flange through-stiffening rib 5 and the flange cover plate 8 exposed to the atmospheric environment are subjected to rust layer stabilization treatment by means of sandblasting, water mist spraying and drying processes; during the rust layer stabilization treatment, it is optional to first sandblast, then cycle through water mist spraying and drying treatment, the water mist spraying time interval is 2h, and the number of cycles is 5 times; the sand material used for sandblasting is 14# brown corundum sand, and the compressed air pressure is 0.2MPa.

[0111] And / or, the rust layer is stabilized by sandblasting, water mist spraying and drying processes; when the rust layer is stabilized, it is optional to first sandblast, then cycle through water mist spraying and drying, the sand material for sandblasting is 14# brown corundum sand, and the compressed air pressure is 0.2MPa; the water mist spraying time is 15min, the interval is 2h, and the number of cycles is 5 times.

[0112] The prepared long-lasting corrosion-resistant thin-walled steel tube concrete rod has a 30% lower processing cost than the traditional factory-prefabricated hollow sandwich steel tube concrete rod. Combined with the saved anti-corrosion coating cost, the total cost is reduced by 8.9%. The prepared thin-walled steel tube concrete rod has an ultimate bending bearing capacity of 628.2 kN·m, and the failure mode is middle bending failure.

[0113] This embodiment also provides a thin-walled steel tube concrete pole as a comparative example, which includes an outer steel tube 1, outer steel tube stiffening ribs 2, flanges 3, flange stiffening ribs 4, flange through stiffening ribs 5, inner steel tube 6, inner steel tube stiffening ribs 7 and concrete 9.

[0114] The thin-walled steel tube concrete pole is composed of a single-section steel-concrete composite pole body, and the pole body length is 2.3m;

[0115] The outer steel pipe 1 and the inner steel pipe 6 are placed concentrically, and the outer steel pipe 1 and the inner steel pipe 6 are welded together through the flange 3, and the middle layer between the outer steel pipe 1 and the inner steel pipe 6 is poured with lightweight high-strength concrete.

[0116] The outer steel pipe 1 is made of Q355B steel; the maximum diameter of the outer steel pipe 1 is 462 mm, and the thickness of the outer steel pipe 1 is 6 mm. The inner steel pipe 6 is made of Q355B steel; the maximum diameter of the inner steel pipe 6 is 372 mm, and the thickness of the inner steel pipe 6 is 3 mm.

[0117] The flange 3 is a flat flange, and the material of the flange 3 is Q355B steel; the flange stiffening ribs 4 and flange through-stiffening ribs 5 are both made of Q355B steel; the flange cover plate 8 is made of Q355B steel. The outer steel pipe stiffening ribs 2 are made of Q355B steel bars with a specification of 3mm×28mm; the inner steel pipe stiffening ribs 5 are made of Q355B steel bars with a specification of 3mm×28mm;

[0118] Four outer steel pipe stiffening ribs 2 are uniformly welded inside the outer steel pipe 1, the length of the outer steel pipe stiffening ribs 2 is equal to that of the outer steel pipe 1, and the angle between the two outer steel pipe stiffening ribs 2 is 90 degrees; four inner steel pipe stiffening ribs 7 are uniformly welded on the outer surface of the inner steel pipe 6, the length of the inner steel pipe stiffening ribs 7 is equal to that of the inner steel pipe 6, and the angle between the two inner steel pipe stiffening ribs 7 is 90 degrees. The outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 are uniformly staggered and assembled, and the angle between the outer steel pipe stiffening ribs 2 and the inner steel pipe stiffening ribs 7 is 45 degrees.

[0119] The lightweight high-strength concrete is modified magnesium oxysulfate concrete; the modified magnesium oxysulfate concrete has a micro-expansion characteristic, and the volume expansion is 1.8‰; the fluidity of the modified magnesium oxysulfate concrete can reach 270mm, and the initial setting time is 210min.

[0120] The present invention provides a method for preparing a long-lasting corrosion-resistant thin-walled steel tube concrete pole, which comprises cutting, punching, rolling, welding an outer steel tube stiffening rib 2 and an inner steel tube stiffening rib 7, welding an outer steel tube 1 and an inner steel tube 6, assembling the outer steel tube 1 and the inner steel tube 6, welding a flange stiffening rib 4 and a flange penetrating stiffening rib 5, hot-dip galvanizing for corrosion protection and pouring concrete.

[0121] Optionally, full welding is used for welding the outer steel pipe stiffening rib 2, the inner steel pipe stiffening rib 7 and the welds at other locations.

[0122] The concrete pouring adopts a grouting pump; the concrete pouring adopts a vibrating pump or a vibrating table to vibrate the concrete to ensure that the concrete is dense and does not have hollows;

[0123] The outer steel pipe 1, the inner steel pipe 6, the flange 3, the welded flange stiffening rib 4 and the flange penetrating stiffening rib 5 are anti-corrosion-resistant by hot-dip galvanizing.

[0124] The prepared thin-walled steel tube concrete rod body has an ultimate bending bearing capacity of 624.8 kN·m, and the failure mode is middle bending failure. The bending bearing capacity of Example 5 is basically equivalent to that of the comparative example.

[0125] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole, characterized in that: include: After the outer steel pipe and the inner steel pipe are coaxially arranged, the ends of the outer steel pipe and the inner steel pipe are connected by a flange; pouring concrete into the interlayer between the outer steel pipe and the inner steel pipe; A flange cover plate is arranged at the middle hole of the flange; The outer steel pipe, the inner steel pipe, the flange and the flange cover are all made of weathering steel; The exposed areas of the outer steel pipe, the inner steel pipe, the flange and the flange cover are subjected to rust layer stabilization treatment by adopting a cyclic operation mode of sandblasting, spraying water mist and drying.

2. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 1, characterized in that: Flange stiffening ribs are arranged between the outer surface of the outer steel pipe and the flange; the flange stiffening ribs are made of weathering steel; and the exposed areas of the flange stiffening ribs are subjected to rust layer stabilization treatment by a cyclic operation of sandblasting, spraying water mist and drying.

3. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 2, characterized in that: A plurality of long holes are provided along the circumference of the inner steel pipe and the outer steel pipe, and flanges are arranged in the long holes to penetrate the stiffening ribs; the flanges are respectively penetrated through the stiffening ribs to be connected with the inner steel pipe, the outer steel pipe and the flanges; The flange penetrating the stiffening rib is made of weathering steel; the exposed area of ​​the flange penetrating the stiffening rib is subjected to rust layer stabilization treatment by adopting a cyclic operation mode of sand blasting, spraying water mist and drying.

4. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 3, characterized in that: The sand material used for sandblasting is 8#~16# brown corundum sand, and the compressed air pressure during sandblasting is 0.1~0.5MPa; the water mist spraying time is 10~30min, the interval is 2~4h, and the number of cycles is 3~10 times.

5. The method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 3, characterized in that: The flange stiffening ribs and the flange penetrating stiffening ribs are staggeredly distributed in the circumferential direction.

6. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 3, characterized in that: A plurality of flange stiffening ribs and a plurality of flanges penetrating the stiffening ribs are evenly arranged in the circumferential direction.

7. The method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 1, characterized in that: A plurality of outer steel pipe stiffening ribs are welded axially on the inner wall of the outer steel pipe.

8. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 7, characterized in that: The outer steel pipe stiffening rib is welded to the inner wall of the outer steel pipe by intermittent welding.

9. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 7, characterized in that: The outer steel pipe stiffening rib is made of threaded steel.

10. The method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 1, characterized in that: A plurality of inner steel pipe stiffening ribs are welded axially on the outer wall of the inner steel pipe.

11. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 8, characterized in that: The inner steel pipe stiffening rib is welded to the outer wall of the inner steel pipe by intermittent welding.

12. A method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 8, characterized in that: The inner steel pipe stiffening rib is made of threaded steel.

13. The method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to claim 1, characterized in that: The concrete adopts modified magnesium oxysulfate concrete.

14. A corrosion-resistant thin-walled steel tube concrete pole, characterized in that: The method for preparing a corrosion-resistant thin-walled steel tube concrete pole according to any one of claims 1 to 13 comprises an outer steel tube and an inner steel tube arranged coaxially, and concrete arranged in a sandwich between the outer steel tube and the inner steel tube; Flanges are provided at the ends of the outer steel pipe and the inner steel pipe; a flange cover is provided at the middle hole of the flange; the outer steel pipe, the inner steel pipe, the flange and the flange cover are all made of weathering steel.

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