Construction method for jointly reinforcing connection node of power transmission tower by using FRP (Fiber Reinforce Plastic) plate and FRP cloth

Abstract

The invention discloses a construction method for jointly reinforcing a connection node of a power transmission tower by using an FRP plate and FRP cloth, which comprises the following steps: S1, cutting the FRP plate and the FRP cloth, and forming an abdicating hole in the FRP cloth; s2, paint and rusted parts on the surfaces of the original angle steel and the original gusset plate are removed, and rough surfaces are manufactured; s3, the top face of the original gusset plate is coated with a first structural adhesive layer, and the FRP plate is bonded to the surface, on the original gusset plate, of the original angle steel; s4, a second structural adhesive layer is coated, and the FRP cloth is pasted on the FRP plate and the original angle steel; s5, covering a plurality of layers of FRP cloth again; s6, the reinforced area is wrapped with a protective film; and S7, the protective film is removed, and the reinforced area is coated with the anti-corrosion layer. According to the invention, reinforcement construction can be carried out without interrupting power transmission; the node reinforcing structure is clear in force transmission, stable in mechanical property, good in reinforcing effect, suitable for various complex nodes of the power transmission tower and high in universality.

Description

Technical Field

[0001] The invention relates to the technical field of transmission iron tower reinforcement, in particular to a construction method for jointly reinforcing a connection node of a transmission iron tower by using an FRP plate and an FRP cloth. Background Art

[0002] Transmission towers are important basic facilities in my country's power transmission projects, and their reliability is the basis for ensuring the normal operation of the transmission system. With the development of my country's economy and urban construction, the capacity of some existing transmission lines cannot meet the use requirements, and the capacity needs to be further expanded. The expansion of transmission lines also requires the corresponding improvement of the performance of transmission towers. In addition, existing transmission towers may also suffer from a certain degree of corrosion after long-term service, causing their bearing capacity to deteriorate, thereby affecting their reliability. It is a relatively economical solution to properly reinforce existing towers so that their reliability performance meets the use requirements or expansion requirements. In recent years, many researchers have used angle steel in parallel to increase the cross-section of transmission tower components, thereby improving the bearing capacity of the tower structure. However, there are few methods for reinforcing the connection nodes between tower components. After increasing the cross-section of the component, the connection nodes between the components may become relatively weak, which cannot meet the design concept of strong nodes and weak components. It is very necessary and urgent to reinforce the connection between components. Summary of the invention

[0003] The purpose of the present invention is to provide a construction method for jointly reinforcing a connection node of a transmission tower using an FRP plate and an FRP cloth, so as to solve the problems existing in the prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a construction method for jointly reinforcing a connection node of a transmission tower using an FRP plate and an FRP cloth, comprising the following steps:

[0005] S1, cutting the FRP plate and FRP cloth according to the specifications of the reinforced node, and opening a clearance hole on the FRP cloth;

[0006] S2, remove the paint and rust on the surface of the original angle steel and the original node plate, and make a rough surface for subsequent bonding;

[0007] S3, coating the first structural adhesive layer on the top surface of the original node plate, bonding the FRP plate to the area enclosed by the original angle steel on the surface of the original node plate, and filling the thickness difference between the original node plate and the original angle steel with the FRP plate;

[0008] S4, after the first structural adhesive layer is cured, a second structural adhesive layer is applied to the surface of the original angle steel and the top surface of the FRP plate, and the FRP cloth is attached to the FRP plate and the original angle steel;

[0009] S5, covering the top surface of the FRP cloth with several layers of FRP cloth again according to the node force requirements;

[0010] S6, after the FRP cloth is bonded, a protective film is used to cover the reinforced area to accelerate the curing of the second structural adhesive;

[0011] S7, after the second structural adhesive is completely cured, the protective film is removed and an anti-corrosion layer is applied to the reinforced area. After the anti-corrosion layer is cured, the reinforcement of the node is completed.

[0012] According to the construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths provided by the present invention, in S1, the FRP plates are CFRP plates, and the FRP cloths are CFRP cloths.

[0013] According to the construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths provided by the present invention, in S2, a rough surface is manufactured on the surface of the original node plate and the surface of the original angle steel by grinding or sandblasting.

[0014] According to the construction method for jointly reinforcing a connection node of a transmission tower using an FRP plate and an FRP cloth provided by the present invention, in S3, the thickness of the FRP plate, the thickness of the first structural adhesive layer, and the thickness of the original angle steel are equal.

[0015] According to the construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths provided by the present invention, in S2, the rusted parts of the original node plates and the original angle steels are removed by grinding and using a rust remover.

[0016] According to the construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths provided by the present invention, in S1, the diameter of the clearance hole is larger than the diameter of the bolt.

[0017] According to the construction method for jointly reinforcing a connection node of a transmission tower using an FRP plate and an FRP cloth provided by the present invention, in S6, a plastic film is used as the protective film, and the reinforced area is wrapped with the plastic film to accelerate the curing of the second structural adhesive.

[0018] According to the construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths provided by the present invention, in S7, the anti-corrosion layer is an epoxy resin layer.

[0019] The present invention discloses the following technical effects:

[0020] In the present invention, the FRP plate and the original node plate are bonded together with structural adhesive to jointly transfer the pressure between the components and are used to reinforce the original node plate; the FRP cloth is bonded together with the original component to provide a new path for the transmission of tension between the original components, thereby improving the tensile bearing performance of the reinforced connection node; the thickness of the FRP plate is as consistent as possible with the thickness of the plate of the original component to reduce the tangential stress of the FRP cloth bonded thereto. The connection node reinforcement construction method is simple and convenient, and the reinforcement construction can be carried out without interrupting power transmission; the node reinforcement structure has clear force transmission, stable mechanical properties, and has a good reinforcement effect; it is suitable for various complex nodes of transmission towers and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 An exploded view of the FRP plate and FRP cloth of the present invention in cooperation with the original node plate and the original angle steel;

[0023] Figure 2 It is a structural schematic diagram of the original node plate and the original angle steel of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the FRP plate of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the FRP cloth of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the FRP plate and FRP cloth of the present invention in cooperation with the original node plate and the original angle steel.

[0027] Among them, 1. original node plate; 2. original angle steel; 3. FRP plate; 4. FRP cloth; 5. first structural adhesive layer; 6. second structural adhesive layer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-Figure 5 The present invention provides a construction method for jointly reinforcing a connection node of a transmission tower using an FRP plate and an FRP cloth, comprising the following steps:

[0031] S1, cutting the FRP plate 3 and the FRP cloth 4 according to the specifications of the reinforced node, and opening a clearance hole on the FRP cloth 4; before the work, a scanning device is used to scan the spatial model of the node part, and the model is imported into the software to generate model size data, and then the laser is used to cut the precise shape of the FRP plate 3 and the FRP cloth 4 according to the model size of the reinforcement area; in particular, the FRP plate 3 needs to ensure that it has a certain margin to avoid the FRP plate 3 from being subjected to a large lateral extrusion when the reinforcement area is slightly deformed under the influence of temperature;

[0032] S2, removing the paint and rust on the surface of the original angle steel 2 and the original node plate 1, and making a rough surface for subsequent bonding;

[0033] S3, apply the first structural adhesive layer 5 on the top surface of the original node plate 1, adhere the FRP plate 3 to the area enclosed by the original angle steel 2 on the surface of the original node plate 1, and make up the thickness difference between the original node plate 1 and the original angle steel 2 through the FRP plate 3; apply the first structural adhesive layer 5 for pasting the CFRP plate 3 on the surface of the original node plate 1, so that the CFRP plate 3 can be attached to the steel surface of the original node plate 1 through the first structural adhesive layer 5 while avoiding galvanic corrosion between the fiber polymer and the steel; after the glue is applied, the CFRP plate 3 should be placed on the original node plate 1 as soon as possible to bond with the original thickness difference part to prevent the glue from solidifying and reducing the bonding quality. The thickness difference between the original angle steel 2 and the original node plate 1 is leveled by laying the CFRP plate 3. The main purpose of this step is to provide a flat pasting surface for the subsequent pasting of the CFRP cloth 4;

[0034] S4, after the first structural adhesive layer 5 is cured, the second structural adhesive layer 6 is applied to the surface of the original angle steel 2 and the top surface of the FRP plate 3, and the FRP cloth 4 is pasted on the FRP plate 3 and the original angle steel 2; the CFRP cloth 4 can be attached to the surface of the original angle steel 2 and the surface of the CFRP plate 3 through the second structural adhesive layer 6 while avoiding galvanic corrosion between the fiber polymer and the steel; after the glue coating is completed, the CFRP cloth 4 needs to be attached to the original angle steel 2 and the original node plate 1 The surface and the upper surface of the CFRP plate 35 are formed to bond as soon as possible to prevent the glue from solidifying and reducing the bonding quality;

[0035] S5, covering the top surface of the FRP cloth 4 with several layers of FRP cloth 4 again according to the node force requirements;

[0036] S6, after the bonding of the FRP cloth 4 is completed, a protective film is used to cover the reinforced area to accelerate the curing of the second structural adhesive;

[0037] S7, after the second structural adhesive is completely cured, the protective film is removed and an anti-corrosion layer is applied to the reinforced area. After the anti-corrosion layer is cured, the reinforcement of the node is completed.

[0038] According to a further optimized solution, in S1, the FRP plate 3 is a CFRP plate 3 and the FRP cloth 4 is a CFRP cloth 4.

[0039] In a further optimized solution, in S2, a rough surface is manufactured on the surface of the original node plate 1 and the surface of the original angle steel 2 by grinding or sandblasting.

[0040] In a further optimized solution, in S3 , the thickness of the FRP plate 3 , the thickness of the first structural adhesive layer 5 , and the thickness of the original angle steel 2 are equal.

[0041] In a further optimized solution, in S2, the rusted parts on the original node plate 1 and the original angle steel 2 are removed by grinding and using a rust remover.

[0042] In a further optimized solution, in S1, the diameter of the clearance hole is larger than the diameter of the bolt.

[0043] In a further optimized solution, in S6, a plastic film is used as the protective film, and the reinforced area is wrapped with the plastic film to accelerate the curing of the second structural adhesive.

[0044] In a further optimized solution, in S7, the anti-corrosion layer is an epoxy resin layer.

[0045] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A construction method for reinforcing a connection node of a transmission tower by using FRP plates and FRP cloths, characterized in that: The steps include: S1, cutting the FRP plate (3) and the FRP cloth (4) according to the specifications of the reinforced node, and opening a clearance hole on the FRP cloth (4); S2, removing the paint and rust on the surface of the original angle steel (2) and the original node plate (1), and making a rough surface for subsequent bonding; S3, coating a first structural adhesive layer (5) on the top surface of the original node plate (1), bonding the FRP plate (3) to the area enclosed by the original angle steel (2) on the surface of the original node plate (1), and filling the thickness difference between the original node plate (1) and the original angle steel (2) with the FRP plate (3); S4, after the first structural adhesive layer (5) is cured, a second structural adhesive layer (6) is coated on the surface of the original angle steel (2) and the top surface of the FRP plate (3), and the FRP cloth (4) is adhered to the FRP plate (3) and the original angle steel (2); S5, covering the top surface of the FRP cloth (4) with several layers of FRP cloth (4) again according to the node force requirements; S6, after the FRP cloth (4) is bonded, a protective film is used to cover the reinforced area to accelerate the curing of the second structural adhesive; S7, after the second structural adhesive is completely cured, the protective film is removed and an anti-corrosion layer is applied to the reinforced area. After the anti-corrosion layer is cured, the reinforcement of the node is completed.

2. The construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths according to claim 1 is characterized in that: In S1, the FRP plate (3) is the CFRP plate (3), and the FRP cloth (4) is the CFRP cloth (4).

3. The construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths according to claim 1, characterized in that: In S2, a rough surface is produced on the surface of the original node plate (1) and the surface of the original angle steel (2) by grinding or sandblasting.

4. The construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths according to claim 1, characterized in that: In S3, the thickness of the FRP plate (3), the thickness of the first structural adhesive layer (5), and the thickness of the original angle steel (2) are equal.

5. The construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths according to claim 1, characterized in that: In S2, the rusted parts on the original node plate (1) and the original angle steel (2) are removed by grinding and using a rust remover.

6. The construction method for strengthening the connection nodes of a transmission tower by using FRP plates and FRP cloths according to claim 1, characterized in that: In S1, the diameter of the clearance hole is larger than the bolt diameter.

7. The construction method for strengthening the connection nodes of a transmission tower by using FRP plates and FRP cloths according to claim 1, characterized in that: In S6, the protective film is a plastic film, and the reinforced area is wrapped with the plastic film to accelerate the curing of the second structural adhesive.

8. The construction method for jointly reinforcing the connection nodes of a transmission tower using FRP plates and FRP cloths according to claim 1, characterized in that: In S7, the anti-corrosion layer is an epoxy resin layer.

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