CN109113411B - Manufacturing method of FRP (fiber reinforced plastic) rib-angle steel combined cross arm for power transmission tower - Google Patents

Abstract

The invention discloses a manufacturing method of an FRP rib-angle steel combined cross arm for a power transmission tower, which comprises the steps of manufacturing needed FRP ribs, angle steel members and various connecting members according to a design drawing of a to-be-built power transmission tower, mounting various FRP rib combinations on the upper part of the cross arm of the power transmission tower according to the design drawing by adopting an FRP rib connecting piece, and building the lower part of the cross arm by using the angle steel members, thereby forming a reinforced fiber composite material (FRP) rib-angle steel member combined cross arm, meanwhile, the lower part of the cross arm is upwards inclined by a fixed angle α in the building process to offset the flexural deformation of the FRP rib on the upper part of the cross arm under the action of gravity or wind load such as a lead, an insulator and the like, thereby ensuring that the cross arm is kept straight all the time in the using process.

Description

Manufacturing method of FRP bar-angle steel combined cross arm for transmission tower

technical field

The invention belongs to the technical field of special structures, and specifically relates to the construction technology of combining reinforced fiber composite material (FRP) bars and angle steel members to develop a new composite structure cross arm suitable for transmission towers in various places.

Background technique

As an important secondary energy, electricity plays a pivotal role in the vigorous development of the economy and the rapid improvement of people's living standards, and its consumption demand is increasing day by day. In order to solve the problem of resource depletion and increasingly prominent energy demand, long-distance electric energy transmission has played a very important role. However, due to the long transmission distance, the transmission loss is relatively large. For this reason, high-voltage transmission lines that can not only solve the energy consumption caused by long-distance transmission but also realize large-capacity transportation overcome the above difficulties, become an effective transmission corridor for saving valuable energy, and improve the actual utilization rate of energy.

The transmission tower line system as the carrier of electric energy often passes through canyons, rivers and rain-prone areas, with large altitude difference and harsh natural environment. At present, a large amount of steel is used as the material for transmission towers, which also brings many difficulties to steel production, construction, transportation, and operation and maintenance. At the same time, high-voltage transmission towers are subjected to a long-term harsh natural environment during the service period, and the materials of the transmission tower line system will be gradually corroded and deteriorated. Considering the continuous and alternating environmental loads (such as wind loads, etc.) The structure will produce fatigue damage accumulation, and the resistance and performance of the system will gradually degrade, thereby reducing the ability of the structure to resist extreme environmental effects, causing the reliability of the structural system to decrease, resulting in accidents. In other words, although atmospheric environmental effects such as corrosion, temperature changes, and wind-induced fatigue are not the direct cause of the failure of the transmission tower and line system, they are quite important factors and cannot be ignored. Therefore, ensuring the safety of the transmission tower and line system plays a vital role in ensuring the safe operation of the power system. It is the future development trend to use new materials to develop the design method and construction technology of transmission towers on the basis of life cycle cost analysis.

In recent years, the use of new high-performance green materials to replace steel has received extensive attention. Reinforced fiber composite materials have been paid more and more attention by the engineering community due to their advantages of high strength, light weight, corrosion resistance, good chemical stability, strong designability and good insulation performance. The industry has obtained a large number of engineering application demonstrations. At the same time, the mechanical properties of reinforced fiber composite materials have been gradually improved with the continuous improvement and development of production technology, and it has become possible to use reinforced fiber composite materials in the construction of transmission towers. The advantages of using reinforced fiber composite materials in the construction of transmission towers are mainly reflected in two aspects: on the one hand, using reinforced fiber composite materials to build transmission towers can not only save steel and protect the environment, but also make full use of the corrosion resistance of reinforced fiber composite materials. On the other hand, the use of reinforced fiber composite materials to build transmission towers is less likely to be stolen, non-toxic, reusable, and also enhances the environmental friendliness of the line. Obviously, reinforced fiber composite materials can effectively reduce or avoid the corrosion damage and wind-induced fatigue damage of transmission towers, prolong the service period of transmission towers, reduce operation and maintenance costs, and solve the corridor problem of transmission lines.

Relevant research has been carried out in the prior art on the application of reinforced fiber composite materials in power transmission lines, but mainly using resin-based glass fiber composite material (GFRP) poles. The resin generally adopts the epoxy resin curing system with good comprehensive performance as the matrix material, and is processed by the continuous filament winding molding process. However, this kind of GFRP utility pole has high cost, poor anti-aging performance and short service life due to process technology and resin formulation problems, so FRP has not been applied in actual transmission line engineering. Today, with the continuous improvement of the mechanical properties of resin and fiber materials, and the improvement of production technology and manufacturing technology, fiber reinforced composite (FRP) poles have received renewed attention in the power transmission industry. The anti-aging properties of the matrix are improved by additives, and CFRP, GFRP, BFRP and various types of FRP are used as reinforcing fiber materials to improve the mechanical properties of the material, and are produced by pultrusion or winding process. Therefore, the current new type of FRP utility pole not only has high bearing capacity, good deformation performance but also low cost.

In recent years, due to the obvious advantages of reinforced fiber composite materials, especially their strength and specific modulus are several times higher than those of steel and other metals, their light weight, corrosion resistance and fatigue resistance are very suitable for mountain towers or bridges. project. Therefore, with the improvement of the production process of reinforced fiber composite materials and the improvement of material properties, the research and application of reinforced fiber composite materials in transmission towers have been started in the prior art.

As far as the mechanical characteristics of transmission towers are concerned, it has been mentioned that environmental corrosion and wind-induced fatigue damage are unfavorable factors that are difficult to overcome for the degradation of mechanical properties of transmission tower components such as angle steel and steel pipes. The performance is generally stronger than its compressive performance. If all fiber reinforced composite materials (FRP) are used, it will inevitably cause material waste. Therefore, under the premise of fully considering the force of the transmission tower body, the present invention fully uses the mechanical properties of steel and fiber reinforced composite materials (FRP) to target the key part of the transmission tower where corrosion damage and fatigue damage are prone to occur - the transmission tower For the cross arm, a combined construction method using fiber reinforced composites (FRP) and angle steel members is proposed.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION An object of the present invention is to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages that will be described hereinafter.

In order to achieve these objects and other advantages according to the present invention, a method for making a FRP bar-angle steel composite cross arm for a transmission tower is provided, comprising the following steps:

Step 1: Fabrication of cross-arm members: use equilateral angle steel members to make two parallel angle steel lower chords at the lower part of the cross-arm and horizontal angle steel webs connected with each other between the two parallel angle steel lower chords; use FRP bars to make two Parallel cross arm FRP bar top chord, two parallel cross arm FRP bar top chords connected to each other FRP bar horizontal web, and cross arm FRP bar top chord and angle steel lower chord connected FRP bar vertical web Rod; process and manufacture the node connecting member connecting the cross arm FRP bar upper chord, FRP bar horizontal web bar, FRP bar vertical web bar, and angle steel lower chord. One end of the node connecting member is a high-strength steel plate with screw holes, and the other One end is a high-strength steel sleeve with a certain number of screw holes and high-strength bolts matching the screw holes;

Step 2: Assemble and connect the compression angle steel members at the lower part of the cross arm: use high-strength bolts and steel gusset plates to connect multiple angle steel lower chords, and at the same time connect two parallel angle steel lower chords to the horizontal angle steel webs to form high-voltage power transmission The lower compression angle steel member of the tower crossarm, the horizontal angle steel web between the angle steel lower chords should be arranged crosswise to form a stable horizontal support system for the two lower chords, and the two parallel angle steel lower chords are connected to the transmission tower. The lower chord and its horizontal angle steel web are inclined upward to form a fixed angle α with the horizontal section;

Step 3. Assemble and connect the tensioned FRP members on the upper part of the cross-arm: connect one end of the upper chord of the two parallel cross-arm FRP bars to the transmission tower body, and the other end and the compression angle steel member of the lower part of the cross-arm are connected by steel gusset plates and high-strength bolts , and the upper chord of the FRP bar of the cross arm and the lower chord of the angle steel form a certain angle; one end of the vertical web bar of the FRP bar is connected to the upper chord of the FRP bar of the cross arm, and the other end is connected to the lower chord of the angle steel; two parallel cross arm FRP bars The horizontal webs of the FRP bars between the upper chords need to be cross-connected; among them, the length of the compression angle steel member at the lower part of the cross-arm is increased, and the length of the FRP upper chord of the upper cross-arm is shortened, so that the assembled cross-arm is inclined upward as a whole. The angle α is fixed to eliminate the excessive deflection and deformation of the cross arm under the action of gravity or vibration loads such as power lines and insulators due to the tensile deformation of the FRP material.

Preferably, in the third step, the manufacturing process of the two parallel cross arm FRP bar upper chords is as follows: inserting both ends of the cross arm FRP bar upper chord into the high-strength steel casing of the node connecting member respectively, the high-strength steel casing and the Epoxy resin glue is used between the upper chords of the cross arm FRP bars, and high-strength bolts are screwed into the screw holes of the high-strength steel casing to squeeze the FRP bars, thereby enhancing the connection between the FRP bars and the high-strength steel casing. The upper chords of the cross-arm FRP bars are connected by the high-strength steel plates of the node connecting members at both ends and the steel gusset plates; The high-strength L-shaped steel plate of the node connecting member and the steel gusset plate are connected by high-strength bolts, and the steel plate on the other side of the steel gusset plate is connected with the angle steel of the transmission tower body or the lower pressure angle of the cross arm by high-strength bolts.

Preferably, in the third step, both ends of the vertical web rod of the FRP bar are inserted into the high-strength steel casing of the node connecting member respectively, and epoxy resin glue is used between the vertical web rod of the FRP bar and the high-strength steel casing. At the same time, screw high-strength bolts into the bolt holes of the high-strength steel sleeve to squeeze the FRP bars, and the high-strength steel plate of the node connecting member at the end connected with the vertical web rod of the FRP bar is connected to the upper chord of the cross arm FRP bar through the steel node plate , the high-strength steel plate of the node connecting member at the other end is connected with the angle steel lower chord through the steel gusset plate, wherein a plurality of FRP bar vertical webs are arranged vertically and crossly between the cross arm FRP bar upper chord and the angle steel lower chord.

Preferably, in the third step, the cross-arrangement and connection of the FRP bar horizontal web bars is as follows: the two ends of the FRP bar horizontal web bars are respectively inserted into the high-strength steel casings of the node connecting members, and the FRP bar horizontal web bars and the high-strength steel sleeves are respectively inserted. Epoxy resin glue is used to bond the pipes, and at the same time, high-strength bolts are screwed into the bolt holes of the high-strength steel sleeve to squeeze the FRP bars, and the high-strength steel plate of the node connecting member at the end connected with the horizontal web rod of the FRP bars passes through the steel nodes. The plate is connected to the top chord of the cross arm FRP bar on one side, and the high-strength steel plate of the node connecting member at the other end is connected to the top chord of the cross arm FRP bar on the other side through the steel gusset plate. Among them, two parallel cross arm FRP bars are top chord. A number of FRP bar horizontal web bars are arranged vertically cross between the bars.

Preferably, the FRP bar adopts any one of carbon fiber reinforced fiber composite material CFRP, basalt fiber reinforced fiber composite material BFRP, and glass fiber reinforced fiber composite material GFRP.

Preferably, the upper chord of the cross arm FRP bar, the horizontal web bar of the FRP bar, the vertical web bar of the FRP bar, the lower chord of the angle steel used for connecting the steel gusset plate, the high-strength steel plate of the node connecting member, and the high-strength steel casing of the high-strength steel casing are all High-strength steel in Q345, Q420 or Q460 strength grades.

Preferably, the angle steel lower chord of the compression angle steel member at the lower part of the cross arm adopts the angle steel member of the strength grade of Q345, Q420 or Q460, and the horizontal angle steel web between the angle steel lower chords adopts the equilateral strength of the Q345, Q420 or Q460 strength grade. High-strength bolts and steel gussets are used to connect angle steel members, angle steel lower chords, and angle steel lower chords and horizontal angle steel webs.

The present invention at least includes the following beneficial effects: in the present invention, the combined structure of angle steel and reinforced fiber composite material (FRP) bars is used to construct the cross arm of the transmission tower, and each component is connected to form a whole through the novel node proposed by the present invention, so as to form a good coordination work ability And the transmission tower cross arm structure with high stability. In the present invention, the combined use of the two materials fully utilizes the strong tensile bearing capacity of the reinforced fiber composite material (FRP) and the strong compressive bearing capacity of the angle steel; the reinforced fiber composite material (FRP) is used as the cross arm. Tensile members can effectively improve the cross-arm's resistance to the occurrence and development of fatigue damage caused by long-term wind-induced vibration of the wire; fiber reinforced composites (FRP) delay or avoid the occurrence of environmental corrosion, thereby reducing the effect of corrosion fatigue coupling damage on cross-arm tension. The influence of the degradation speed of the mechanical properties of the members; the upwardly inclined structure of the compression angle steel members at the lower part of the cross arm improves the bearing capacity of the cross members; the invention is beneficial to realize the application of the new reinforced fiber composite material in the construction of the transmission tower, thereby improving the transmission tower. durability.

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings:

Fig. 1 is the three-dimensional schematic diagram of FRP bar-angle steel combined cross arm of the present invention;

2 is a three-dimensional schematic diagram of a node connecting member of the present invention;

Fig. 3 is the three-dimensional schematic diagram of the FRP rib with node connecting member in the present invention;

Fig. 4 is the connection schematic diagram of cross arm FRP rib upper chord and FRP rib horizontal web rod in the present invention;

Fig. 5 is the connection node schematic diagram of angle steel lower chord and horizontal angle steel web in the present invention;

6 is a schematic diagram of the connection node between the FRP bar and the horizontal web bar of the FRP bar and the angle steel of the tower body in the middle end cross arm of the present invention.

Detailed ways:

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be understood that terms such as "having", "comprising" and "including" as used herein do not assign the presence or addition of one or more other elements or combinations thereof.

1 to 6 show a FRP bar-angle steel composite cross arm for a transmission tower of the present invention, and the manufacturing method of the FRP bar-angle steel composite cross arm includes the following steps:

Step 1. Production of cross-arm members: use equilateral angle steel members to make two parallel angle steel lower chords 1 at the lower part of the cross-arm and horizontal angle steel webs 2 connected to each other between the two parallel angle steel lower chords; FRP bars 8 are used. Make two parallel cross arm FRP bar top chords 3, FRP bar horizontal web bars 4 connected to each other between the two parallel cross arm FRP bar top chords, and between the cross arm FRP bar top chord 3 and angle steel bottom chord 1 Connected vertical web bars of FRP bars 5; processing and manufacturing cross-arm FRP bar upper chords 3, FRP bar horizontal web bars 4, FRP bar vertical web bars 5, and angle steel lower chords 1. Node connecting member 6, node One end of the connecting member is a high-strength steel plate 61 or a high-strength L-shaped steel plate 63 with screw holes, and the other end is a high-strength steel sleeve 62 with a certain number of screw holes and high-strength bolts matching the screw holes;

Step 2: Assembling and connecting the compression angle steel members at the lower part of the cross arm: use high-strength bolts and steel gusset plates 7 to connect multiple angle steel lower chords 1, and connect two parallel angle steel lower chords 1 to horizontal angle steel webs 2 at the same time, One end of the two parallel angle steel lower chords 1 is bolted to the fixed angle steel 10 perpendicular to the angle steel lower chord 1 to form the lower pressure angle steel member of the cross arm of the high-voltage transmission tower, and the horizontal angle steel web 2 between the angle steel lower chords 1 It is necessary to cross the two lower chords to form a stable horizontal support system. One end of the two parallel angle steel lower chords 1 is connected to the transmission tower, and the other end is connected to the two parallel cross-arm FRP bar upper chords, and the angle steel lower chords are connected. and its horizontal angle steel webs are inclined upward to form a fixed angle α with the horizontal section of the vertical transmission tower,

Step 3. Assemble and connect the tensioned FRP members on the upper part of the cross-arm: connect one end of the upper chord 3 of the two parallel cross-arm FRP bars to the angle steel of the vertical transmission tower, and the other end and the compression angle steel member at the lower part of the cross-arm are made of steel gusset plate 7 is connected with high-strength bolts, and the two parallel upper chords 3 of the cross arm FRP bars and the two parallel lower chords 1 of angle steel form a certain angle; one end of the vertical web bar 5 of the FRP bars is connected with the upper chord 3 of the cross arm FRP bars , the other end is connected with the angle steel lower chord 1; the FRP bar horizontal web bar 4 between the two parallel cross arm FRP bar upper chords 3 needs to be cross-connected; among them, the length of the compression angle steel member at the lower part of the cross arm is increased, and at the same time Shorten the length of the FRP top chord 3 of the upper cross arm, so that the assembled cross arm is inclined upward by a fixed angle α, so as to eliminate the occurrence of the cross arm under the action of gravity or vibration load such as transmission lines and insulators due to the tensile deformation of the FRP material. Excessive deflection.

In the technical solution of the present invention, the reasonable combination of fiber reinforced composite material FRP and angle steel not only changes the load-bearing and deformation capacity of the cross arm, but also improves the durability of the cross arm. Improve the bearing capacity of the cross arm; the reinforced fiber composite material FRP has good insulation, strong corrosion resistance and wind-induced fatigue resistance, which prolongs the service life of the cross arm and improves the durability of the cross arm; the cross arm is complex and adopts reinforced fiber composite materials The material (FRP) is used as the tension member and the angle steel is used as the compression member, which makes full use of the mechanical properties of different materials in the composite structure, and has the characteristics of novel and beautiful structure, short construction period, energy saving, material saving and environmental protection.

In the above technical solution, in the third step, the manufacturing process of the two parallel cross arm FRP bar upper chords 3 is as follows: inserting both ends of the cross arm FRP bar upper chord 3 into the high-strength steel sleeves 62 of the node connecting member 6 respectively Inside, epoxy resin glue is used between the high-strength steel sleeve 62 and the upper chord 3 of the cross arm FRP rib. The connection between the high-strength steel sleeves 62, the cross-arm FRP bar upper chord 3 is formed by connecting the high-strength steel plates 61 of the node connecting members at both ends and the steel node plate 7, and one end of the cross-arm FRP bar upper chord is connected to the lower part of the cross-arm. The connection of the compression angle steel members adopts the high-strength L-shaped steel plate 63 of the node connecting member 6 on the upper chord of the cross arm FRP bar and the steel gusset plate 7 to connect with high-strength bolts, and the steel plate on the other side of the steel gusset plate and the lower part of the cross arm are compressed. The angle steel is connected by high-strength bolts, and the steel plate on the other side of the high-strength L-shaped steel plate 63 is connected with the high-strength steel plate of the FRP reinforced horizontal web 4. The high-strength L-shaped steel plate 63 can not only realize the connection with the compression angle steel at the lower part of the cross arm, but also realize the connection with the lower part of the cross arm. The connection of the FRP bar horizontal web bar 4; the high-strength steel plate 61 of the node connecting member 6 at the other end of the two parallel cross-arm FRP bar upper chord 3 and the angle steel on the vertical transmission tower pass through the steel node plate 7 and the node high-strength steel plate 9 connect.

In the above technical solution, in the third step, the two ends of the FRP bar vertical web rod 5 are respectively inserted into the high-strength steel casing 62 of the node connecting member 6, and the FRP bar vertical web rod 5 and the high-strength steel casing 62 are inserted between the two ends. Epoxy resin glue is used to bond between them, and at the same time, high-strength bolts are screwed into the bolt holes of the high-strength steel sleeve to squeeze the FRP bars. The steel gusset plate 7 is connected with the upper chord 3 of the cross-arm FRP bar, and the high-strength steel plate 61 of the node connecting member 6 at the other end is connected with the lower chord 1 of the angle steel through the steel gusset plate 7, wherein the upper chord 3 of the cross-arm FRP bar and the lower chord of the angle steel are connected. A plurality of vertical web bars 5 of FRP bars are arranged vertically and intersectingly between 1.

In the above technical solution, in the third step, the cross-arrangement and connection of the FRP bar horizontal web bars 4 is as follows: the two ends of the FRP bar horizontal web bars 4 are respectively inserted into the high-strength steel sleeves 62 of the node connecting members 6, and the FRP bars are The horizontal web rod 4 and the high-strength steel sleeve 62 are bonded with epoxy resin, and at the same time, the high-strength bolts are screwed into the bolt holes of the high-strength steel sleeve to squeeze the FRP rib, and the end connected with the FRP rib horizontal web rod 4 The high-strength steel plate 61 of the node connecting member 6 is connected to the high-strength steel plate 61 of the node connecting member 6 of the cross-arm FRP bar upper chord 3 through the steel node plate 7, and the high-strength steel plate 61 of the node connecting member 6 at the other end passes through the steel node. The plate 7 is connected to the high-strength steel plate 61 of the node connecting member 6 of the cross-arm FRP bar upper chord 3 on the other side, wherein a plurality of FRP bars are vertically crossed between the two parallel cross-arm FRP bar upper chords 3 Horizontal abdominal rod 4.

In the above technical solution, the FRP bar adopts any one of carbon fiber reinforced fiber composite material CFRP, basalt fiber reinforced fiber composite material BFRP, and glass fiber reinforced fiber composite material GFRP.

In the above technical solution, the cross arm FRP bar upper chord 3, FRP bar horizontal web bar 4, FRP bar vertical web bar 5, and angle steel lower chord 1 are connected with the steel node plate 7 and the high-strength steel plate 61 of the node connecting member. And high-strength steel casing 62 high-strength steel plates are made of high-strength steel of Q345, Q420 or Q460 strength grade.

In the above technical solution, the angle steel lower chord 1 of the compression angle steel member at the lower part of the cross arm adopts the angle steel member of the strength grade of Q345, Q420 or Q460, and the horizontal angle steel web 2 between the angle steel lower chords 1 adopts Q345, Q420 or Q460 For equilateral angle steel members with strength grades, high-strength bolts and steel gusset plates 7 are used to connect the angle steel lower chords 1 and between the angle steel lower chord 1 and the horizontal angle steel web 2 .

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (3)

1. A manufacturing method of an FRP (fiber reinforced Plastic) bar-angle steel combined cross arm for a power transmission tower is characterized by comprising the following steps of:

step one, manufacturing a cross arm component: an equilateral angle steel component is adopted to manufacture two parallel angle steel lower chords at the lower part of the cross arm and a horizontal angle steel web member connected between the two parallel angle steel lower chords; the method comprises the following steps that FRP ribs are adopted to manufacture two parallel cross arm FRP rib upper chords, FRP rib horizontal web members connected between the two parallel cross arm FRP rib upper chords and FRP rib vertical web members connected between the cross arm FRP rib upper chords and the angle steel lower chords; processing and manufacturing a joint connecting member for connecting the upper chord of the cross arm FRP rib, the horizontal web member of the FRP rib, the vertical web member of the FRP rib and the lower chord member of the angle steel, wherein one end of the joint connecting member is a high-strength steel plate with screw holes, and the other end of the joint connecting member is a high-strength steel sleeve with a certain number of screw holes and a high-strength bolt matched with the screw holes;

connecting a plurality of angle steel lower chords by adopting high-strength bolts and steel node plates, and simultaneously connecting two parallel angle steel lower chords with horizontal angle steel web members to form the lower compression angle steel member of the cross arm of the high-voltage power transmission tower, wherein the horizontal angle steel web members between the angle steel lower chords need to be arranged in a crossed manner to form a stable horizontal support system for the two lower chords, the two parallel angle steel lower chords are connected to the power transmission tower body, and the angle steel lower chords and the horizontal angle steel web members are both inclined upwards to form a fixed angle α with the horizontal section;

connecting one end of an upper chord member of the two parallel cross arm FRP bars with a power transmission tower body, connecting the other end of the upper chord member of the two parallel cross arm FRP bars with a lower compression angle steel member of the cross arm by adopting a steel node plate and a high-strength bolt, and forming a certain angle between the upper chord member of the cross arm FRP bars and the lower chord member of the angle steel;

in the third step, the manufacturing process of the upper chords of the two parallel cross arm FRP bars is as follows: the two ends of the upper chord of the cross arm FRP rib are respectively inserted into high-strength steel sleeves of the node connecting members, the high-strength steel sleeves and the upper chord of the cross arm FRP rib are bonded by epoxy resin glue, and meanwhile, high-strength bolts are screwed into screw holes of the high-strength steel sleeves to extrude the FRP rib, so that the connection between the FRP rib and the high-strength steel sleeves is enhanced, and the upper chord of the cross arm FRP rib is formed by connecting high-strength steel plates of the node connecting members at the two ends and steel node plates; the connection of the upper chord of the cross arm FRP rib and the lower stressed angle steel component of the cross arm adopts a high-strength bolt to connect a high-strength L-shaped steel plate of a node connecting component on the upper chord of the cross arm FRP rib and a steel node plate, and the steel plate on the other side of the steel node plate is connected with the angle steel of the power transmission tower body or the lower stressed angle steel of the cross arm by the high-strength bolt;

in the third step, two ends of the FRP rib vertical web members are respectively inserted into the high-strength steel sleeve of the joint connecting member, the FRP rib vertical web members and the high-strength steel sleeve are bonded by epoxy resin glue, meanwhile, high-strength bolts are screwed into bolt holes of the high-strength steel sleeve to extrude the FRP ribs, high-strength steel plates of the joint connecting member at one end connected with the FRP rib vertical web members are connected with the cross arm FRP rib upper chord members through steel node plates, and high-strength steel plates of the joint connecting member at the other end are connected with the angle steel lower chord members through steel node plates, wherein a plurality of FRP rib vertical web members are vertically and crossly arranged between the cross arm FRP rib upper chord members and the angle steel lower chord members;

in the third step, the horizontal web members of the FRP bars are connected in a crossed manner: the two ends of the FRP rib horizontal web members are respectively inserted into the high-strength steel sleeve of the node connecting member, the FRP rib horizontal web members and the high-strength steel sleeve are bonded by epoxy resin glue, meanwhile, the high-strength bolts are screwed into bolt holes of the high-strength steel sleeve to extrude FRP ribs, the high-strength steel plate of the node connecting member at one end connected with the FRP rib horizontal web members is connected with the upper chord of the cross arm FRP rib at one side through a steel node plate, the high-strength steel plate of the node connecting member at the other end is connected with the upper chord of the cross arm FRP rib at the other side through the steel node plate, and a plurality of FRP rib horizontal web members are vertically and crossly arranged between the upper chords of the two parallel cross arm FRP ribs;

the FRP rib adopts any one of carbon fiber reinforced fiber composite material CFRP, basalt fiber reinforced fiber composite material BFRP and glass fiber reinforced fiber composite material GFRP.

2. The method for manufacturing the FRP rib-angle steel combined cross arm for the power transmission tower as claimed in claim 1, wherein the FRP rib upper chord, the FRP rib horizontal web member, the FRP rib vertical web member, the steel node plate adopted for connecting the angle steel lower chord member, the high-strength steel plate of the node connecting member and the high-strength steel plate of the high-strength steel sleeve all adopt high-strength steel with the strength grade of Q345, Q420 or Q460.

3. The method for manufacturing the FRP rib-angle steel combined cross arm for the power transmission tower as claimed in claim 1, wherein the angle steel lower chord of the cross arm lower compression angle steel member adopts an angle steel member with Q345, Q420 or Q460 strength grade, the horizontal angle steel web member between the angle steel lower chord adopts an equal angle steel member with Q345, Q420 or Q460 strength grade, and the angle steel lower chord, the angle steel lower chord and the horizontal angle steel web member are connected by high-strength bolts and steel node plates.

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