Reinforcing structure and reinforcing method for defective angle steel of power transmission tower

Abstract

The invention provides a reinforcing structure and method for defective angle steel of a power transmission tower, and the structure comprises reinforcing angle steel which is internally attached to the inner side of the defective angle steel, and a first friction surface is formed at the attaching position; one side of the reinforcing steel plate is attached to the outer side of the defective angle steel, and a second friction surface is formed at the attached position; the inner attaching hoop is attached to the inner side of the reinforcing angle steel; the externally-attached hoop is attached to the other side of the reinforcing steel plate; the externally-attached hoop and the internally-attached hoop are connected through a bolt-nut. According to the scheme, the laminated structure is formed by the reinforcing angle steel, the defective angle steel and the reinforcing steel plate, and the sectional inertia moment and the overall rigidity of the defective angle steel are increased through clamping of the externally-attached hoop and the internally-attached hoop; by means of the bolt-nut fastening effect, it can be ensured that all components are tightly attached to the defective angle steel, and cooperative stress is achieved; and normal work of the power transmission tower and normal operation of a power grid are ensured.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power transmission tower reinforcement, in particular to a reinforcing structure and method for a defective angle steel of a power transmission tower. BACKGROUND

[0002] As the core support structure of the power transmission line of the power grid, the power transmission tower plays a key role in ensuring the continuous and stable operation of the power transmission line. The tower body of the power transmission tower is mainly composed of four main materials (usually larger angle steels) and a large number of diagonal materials and cross members (usually smaller angle steels) connected to form a large and stable space truss structure for supporting huge vertical loads (tower weight, conductor weight, insulator string weight) and horizontal loads (wind load, conductor tension). The reason for using angle steel structure is that, under the premise of ensuring sufficient strength, angle steel has the advantage of being light, and the "L" shaped cross section makes it have good bending (anti-bending) and torsional (anti-torsion) resistance in all directions, and it is not easy to lose stability. Compared with flat steel or round steel, it can more effectively resist forces from different directions. In addition, since the power transmission tower is in a continuous working state all year round, and the working environment is affected by extreme weather, external environmental erosion, human factors and other multiple factors, it is easy to cause local damage, corrosion and deformation of the angle steel. The existing reinforcement method usually uses welding, drilling and adhesive reinforcement to externally fix the angle steel structure.

[0003] However, the above reinforcement methods have certain disadvantages, mainly because the top of the power transmission tower is usually in a high-altitude environment and needs to be maintained in a live working state, so the reinforcement process cannot interfere with the normal power supply of the line, and the safety and convenience of construction are extremely high. In addition, the use of adhesive methods has the risk of further eroding the angle steel, and the reinforcement effect cannot be guaranteed, so a reinforcement structure / method is needed to ensure the stable operation of the power transmission tower. SUMMARY

[0004] The reinforcing structure and method for a defective angle steel of a power transmission tower provided by the embodiment of the present application can realize reinforcement of the defective angle steel while ensuring normal operation of the power transmission tower.

[0005] In a first aspect, the embodiment of the present application provides a reinforcing structure for a defective angle steel of a power transmission tower, which is applied to the defective angle steel and includes:

[0006] The reinforcing angle steel is attached to the inner side of the defective angle steel, and a first friction surface is formed at the attachment position;

[0007] The reinforcing steel plate is attached to the outer side of the defective angle steel on one side, and a second friction surface is formed at the attachment position;

[0008] The inner-attached hoop is attached to the inner side of the reinforcing angle steel, and the edge of the inner-attached hoop is provided with a first through hole;

[0009] The outer clamping hoop is attached to the other side of the reinforcing steel plate, and the edge of the outer clamping hoop is provided with a second through hole; the outer clamping hoop and the inner clamping hoop are fixedly connected through the bolt-nut based on the first through hole and the second through hole.

[0010] In a second aspect, the embodiments of the present application provide a reinforcing method for a defective angle steel of a power transmission tower, which is applied to a reinforcing structure of the defective angle steel of the power transmission tower, and comprises the following steps:

[0011] Stress damage information of the defective angle steel is acquired to obtain a damage area of the defective angle steel;

[0012] The damage area and the corresponding area of the reinforcing angle steel and the reinforcing steel plate are polished to obtain a friction opposite surface;

[0013] The reinforcing angle steel is attached to the inner side of the defective angle steel, and the reinforcing steel plate is attached to the outer side of the defective angle steel;

[0014] The inner clamping hoop and the outer clamping hoop are fixedly connected to the surfaces of the reinforcing angle steel and the reinforcing steel plate through the bolt-nut.

[0015] The technical scheme provided by the embodiments of the present application forms a superimposed structure of the reinforcing angle steel, the defective angle steel and the reinforcing steel plate, and then increases the sectional moment of inertia of the damaged area of the defective angle steel and improves the overall rigidity of the defective angle steel through the clamping of the outer clamping hoop and the inner clamping hoop, so as to avoid the deformation aggravation caused by local damage; the fastening effect of the bolt-nut can ensure that each component is closely attached to the defective angle steel, realizes cooperative stress, greatly improves the compression and compression-bending bearing capacity of the damaged area of the defective angle steel, meets the stress requirement of the main material at the bottom of the power transmission tower, and meets the normal work of the power transmission tower, so as to ensure the normal operation of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a top view of a reinforcing structure for a defective angle steel of a power transmission tower provided by the embodiments of the present application;

[0017] Figure 2a is a defective part diagram of a defective angle steel in a reinforcing structure for a defective angle steel of a power transmission tower provided by the embodiments of the present application;

[0018] Figure 2b is a correction diagram of a defective part of a defective angle steel in a reinforcing structure for a defective angle steel of a power transmission tower provided by the embodiments of the present application;

[0019] Figure 2c is a schematic diagram of a reinforcing angle steel and a reinforcing steel plate in a reinforcing structure for a defective angle steel of a power transmission tower provided by the embodiments of the present application;

[0020] Figure 3This is a schematic diagram of a reinforcement structure for defective angle steel in power transmission towers provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of a stiffening rib in a reinforcement structure for defective angle steel of a power transmission tower provided in an embodiment of this application;

[0022] Figure 5 This is a flowchart of a method for reinforcing defective angle steel in power transmission towers, provided in an embodiment of this application.

[0023] Figure 6 This is a flowchart of a method for grinding and fixing in a reinforcement method for defective angle steel of a power transmission tower provided in an embodiment of this application.

[0024] In the diagram: 1. Reinforcing angle steel; 2. Reinforcing steel plate; 3. Inner clamp; 4. Through hole; 5. Outer clamp; 6. Bolt; 7. Nut; 8. Stiffening rib; 9. Leg plate; 10. Defective angle steel; 11. Second through hole. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a top view of a reinforcement structure for defective angle steel of a power transmission tower provided in an embodiment of this application. The reinforcement structure is applied to defective angle steel of a power transmission tower, and the reinforcement method can be implemented by software and / or hardware. The reinforcement method can be configured in electronic devices such as computers.

[0027] like Figures 1 to 4 As shown, the reinforcement structure provided in this application embodiment includes:

[0028] A reinforcing angle steel 1 is attached to the inner side of the defective angle steel 10, and the attachment point forms a first friction surface; the first friction surface includes a surface that supports the defective portion of the defective angle steel 10 (such as...). Figure 2a The area is obtained by grinding the area corresponding to the defect in the reinforcing angle steel 1 (as shown in the figure). Figure 2b As shown; typically, the defective angle steel 10, the reinforcing angle steel 1, and the inner clamp 3 and outer clamp 5 are L-shaped structures (e.g. Figure 2c As shown in the figure, this is mainly because L-shaped angle steel has a better stabilizing effect. Accordingly, in order to achieve a better fit with the defective angle steel 10, the reinforcement of angle steel 1, inner clamp 3, and outer clamp 5 is preferably made using an L-shaped structure.

[0029] The reinforcing steel plate 2 is attached to the outer side of the defective angle steel 10 on one side, and the attachment point forms a second friction surface; the second friction surface is obtained by grinding the defective part and the position in the reinforcing steel plate 2 corresponding to the defective part.

[0030] The inner clamp 3 is attached to the inner side of the reinforcing angle steel 1, and the edge of the inner clamp 3 is provided with a first through hole 4;

[0031] The outer clamp 5 is attached to the other side of the reinforcing steel plate 2. The edge of the outer clamp 5 is provided with a second through hole 11. The outer clamp 5 and the inner clamp 3 are fixedly connected by bolts 6 and nuts 7 based on the first through hole 4 and the second through hole 11.

[0032] In the actual reinforcement process, the defective angle steel 10, the reinforcing angle steel 1, the reinforcing steel plate 2, the inner clamp 3, and the outer clamp 5 are all equipped with a galvanized layer. The first friction surface and the second friction surface are formed by grinding the galvanized layer of the defective angle steel 10, the reinforcing angle steel 1, and the reinforcing steel plate 2. The roughness of the grinding can be controlled within 40-75μm, and the anti-slip coefficient is ≥0.45, thereby avoiding damage to each component and ensuring the mechanical properties of each component while ensuring the anti-corrosion effect of the galvanized layer.

[0033] Due to the differences in the size of the defective angle steel 10 and the size of the defective part, the selection of the reinforcing angle steel 1, the inner clamp 3, and the outer clamp 5 should take into account both the reinforcement effect and economy; accordingly, the bolt 6 used is preferably a friction high-strength bolt 6, and the inner clamp 3 and the outer clamp 5 can be double-hole or four-hole, that is, double-bolt special-shaped clamp or four-bolt special-shaped clamp. The selection of double bolt or four bolt is based on the compressive and bending bearing capacity requirements of the defective part of the defective angle steel 10;

[0034] Since the lengths of the reinforcing angle steel 1 and the reinforcing steel plate 2 are cut according to the defect range, multiple sets of inner and outer clamps and outer clamps 5 are needed to be distributed along the length of the reinforcing angle steel 1 and / or the reinforcing steel plate 2 to ensure the reinforcement effect. In a preferred embodiment, the inner clamps 3 and outer clamps 5 are fixed together at the trisection points of the surface length of the reinforcing steel plate 2 by bolts 6 and nuts 7. Therefore, the number of inner clamps 3 and outer clamps 5 is not less than 4 sets.

[0035] Additionally, it should be noted that the inner side of the inner clamp 3 is fixed with stiffening ribs 8 for supporting the inwardly bent structure. As mentioned above, the inner clamp 3 is an L-shaped structure. The stiffening ribs 8 are fixedly connected to the two limb plates 9 of the inner clamp 3 by welding. After welding, it is necessary to confirm that the weld is full, without any incomplete welds or leaks. After welding, the weld slag should be removed, and the verticality of the stiffening ribs 8 should be checked. A double-layer stiffening rib structure should be selected according to the actual reinforcement strength requirements. The thickness of the stiffening ribs 8 should be 2mm thinner than the thickness of the reinforcing angle steel 1 to avoid stress concentration in the stiffening ribs 8. The arrangement of the through holes and stiffening ribs 8 can be selected by placing the through holes in the middle or on the top and bottom sides of the stiffening ribs 8, depending on the actual requirements for 2 bolts or 4 bolts. The diameter of the through holes should be 1mm larger than the diameter of the bolts 6 to ensure normal use.

[0036] As a preferred embodiment, an L-shaped weld is provided between the external clamp 5 and the reinforcing steel plate 2. This weld is used to strengthen the overall strength of the reinforced structure, and its length is less than or equal to the length of the external clamp 5 to avoid thermal stress damage to the defective angle steel 10.

[0037] The technical solution provided in this application forms a composite structure with the reinforcing angle steel, the defective angle steel, and the reinforcing steel plate. Then, through the clamping of external and internal clamps, the moment of inertia of the damaged area of ​​the defective angle steel is increased, enhancing its overall stiffness. This avoids aggravated deformation due to localized damage. The bolt-nut fastening action ensures that each component is tightly fitted to the defective angle steel, achieving coordinated force distribution. This significantly improves the compressive and bending bearing capacity of the damaged area of ​​the defective angle steel, meeting the stress requirements of the main material at the bottom of the transmission tower while ensuring the normal operation of the transmission tower and guaranteeing the normal operation of the power grid.

[0038] Figure 5 This is a flowchart illustrating a method for reinforcing defective angle steel in transmission towers, as provided in an embodiment of this application. The method is applied to the reinforcement structure provided in the aforementioned embodiments and includes:

[0039] S10: Obtain stress damage information of defective angle steel and obtain the damaged area of ​​defective angle steel; detect the stress damage of defective angle steel through flaw detection equipment. The purpose is to determine the size of the reinforcing angle steel and reinforcing steel plate to be used by obtaining the damaged area, and at the same time clarify the subsequent grinding process for the damaged area, such as determining that the anti-slip coefficient of the friction surface needs to be ≥0.45.

[0040] S20: Grind the damaged area and the corresponding areas of the reinforced angle steel and reinforced steel plate to create a friction surface. It should be noted that the grinding process aims to remove rust, oil, oxide layers, and damaged or peeling parts from the surface of the damaged area until a metallic luster is exposed, ensuring that the bonding surface is free of impurities affecting the tightness of contact. Furthermore, before performing step S20, the reinforced angle steel and inner clamps need to be back-carved. The purpose of this back-carving is to ensure that the reinforced angle steel and the defective angle steel can fit tightly together without significant gaps; therefore, the depth of the back-carving must be determined based on the actual chamfer dimensions of the defective angle steel. Specifically, the grinding and fixing process is as follows... Figure 6 As shown:

[0041] S21: Grind the corresponding positions of the reinforced angle steel and reinforced steel plate according to the damaged area; it should be added here that the defective angle steel, reinforced angle steel and reinforced steel plate are all equipped with a galvanized layer. The grinding process is to grind the galvanized layer to form a friction surface with an anti-slip coefficient ≥0.45, without damaging the original structure of the locally damaged angle steel, and to preserve the mechanical properties of the original components to the greatest extent.

[0042] S22: Secure the inner and outer clamps together with bolts and nuts at three equal points along the length of the reinforcing steel plate. Since the lengths of the reinforcing angle steel and the reinforcing steel plate are determined based on the defect range, multiple sets of inner and outer clamps are needed to distribute along the length of the reinforcing angle steel and / or the reinforcing steel plate. For example, the inner clamps can be placed at three equal points, including but not limited to the reinforcing angle steel. The aforementioned inner and outer clamps are preferably standard parts for ease of processing and replacement.

[0043] S30: The reinforcing angle steel is attached to the inside of the defective angle steel, and the reinforcing steel plate is attached to the outside of the defective angle steel; the reinforcing angle steel and the reinforcing steel plate need to be attached to the defective angle steel respectively and the limb plates need to be aligned; thus forming a composite structure of "outer clamp - reinforcing steel plate - defective angle steel - reinforcing angle steel - inner clamp".

[0044] S40: Fix the inner and outer clamps to the surfaces of the reinforcing angle steel and reinforcing steel plate respectively, and secure them with bolts and nuts. During the actual tightening process, the bolts need to be tightened twice: first, tighten to 50% of the design torque, let stand for 10 minutes, and then tighten again to the design torque. During tightening, ensure that each bolt is subjected to uniform force to avoid localized stress concentration that could lead to deformation.

[0045] Following step S40, the process includes welding the reinforcing steel plate and the external clamp. The welding uses the same material as the reinforcing steel plate and the external clamp, which serves to achieve a secondary anchoring effect.

[0046] The reinforcement method for defective angle steel of transmission towers provided in this embodiment of the invention adopts the same technical concept and means as the reinforcement structure for defective angle steel of transmission towers, and achieves the same technical effect, which will not be repeated here.

[0047] This invention defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this invention.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A reinforcement structure for defective angle steel in power transmission towers, applied to defective angle steel, characterized in that, include: A reinforcing angle steel (1) is attached to the inner side of the defective angle steel (10), and the attachment point forms a first friction surface; The reinforcing steel plate (2) is attached to the outside of the defective angle steel (10) on one side, and the attachment point forms a second friction surface; An inner clamp (3) is attached to the inner side of the reinforcing angle steel (1), and the edge of the inner clamp (3) is provided with a first through hole (4). An external clamp (5) is attached to the other side of the reinforcing steel plate (2), and the edge of the external clamp (5) is provided with a second through hole (11); the external clamp (5) and the internal clamp (3) are fixedly connected by bolts (6) and nuts (7) based on the first through hole (4) and the second through hole (11).

2. The reinforced structure according to claim 1, characterized in that, The defective angle steel (10), the reinforcing angle steel (1), the inner clamp (3), and the outer clamp (5) are L-shaped structures.

3. The reinforced structure according to claim 2, characterized in that, The inner side of the inner clamp (3) is provided with stiffening ribs (8), and the stiffening ribs (8) are respectively fixed to the two limb plates (9) of the L-shaped inner clamp (3).

4. The reinforced structure according to claim 2, characterized in that, The first friction surface is obtained by grinding the defective part of the defective angle steel (10) and the position of the reinforced angle steel (1) corresponding to the defective part; The second friction surface is obtained by grinding the defective part and the position in the reinforcing steel plate (2) corresponding to the defective part.

5. The reinforced structure according to claim 4, characterized in that, The defective angle steel (10), the reinforcing angle steel (1), the reinforcing steel plate (2), the inner clamp (3), and the outer clamp (5) are all provided with a galvanized layer.

6. The reinforced structure according to claim 1, characterized in that, The inner clamp (3) and the outer clamp (5) are fixed together by bolts (6) and nuts (7) at three equal points on the surface length of the reinforcing steel plate (2).

7. A method for reinforcing defective angle steel in transmission towers, applied to the reinforcement structure of defective angle steel in transmission towers, characterized in that, include: Obtain stress damage information of the defective angle steel to determine the damage area of ​​the defective angle steel; Grind the damaged area and the corresponding areas of the reinforced angle steel and reinforced steel plate to obtain the friction surfaces; The reinforcing angle steel is attached to the inside of the defective angle steel, and the reinforcing steel plate is attached to the outside of the defective angle steel. The inner and outer clamps are fixed to the surfaces of the reinforcing angle steel and the reinforcing steel plate, respectively, and then connected by bolts and nuts.

8. The method according to claim 7, characterized in that, After the connection is fixed by bolts and nuts, it includes: The reinforcing steel plate and the external clamp are welded together.

9. The method according to claim 7, characterized in that, Before grinding the damaged area and the corresponding areas of the reinforced angle steel and reinforced steel plate, the process also includes: The reinforcing angle steel and the inner clamp are subjected to back-shaping treatment.

10. The method according to claim 7, characterized in that, The process of fixing the inner and outer clamps to the surfaces of the reinforcing angle steel and the reinforcing steel plate respectively includes: Based on the damaged area, the corresponding positions of the reinforcing angle steel and reinforcing steel plate are ground. The inner and outer clamps are fixed together with bolts and nuts at three equal points along the length of the reinforced steel plate.

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