CN109113411B - Manufacturing method of FRP (fiber reinforced plastic) rib-angle steel combined cross arm for power transmission tower - Google Patents
Manufacturing method of FRP (fiber reinforced plastic) rib-angle steel combined cross arm for power transmission tower Download PDFInfo
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- CN109113411B CN109113411B CN201811184344.7A CN201811184344A CN109113411B CN 109113411 B CN109113411 B CN 109113411B CN 201811184344 A CN201811184344 A CN 201811184344A CN 109113411 B CN109113411 B CN 109113411B
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- E—FIXED CONSTRUCTIONS
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
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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
Technical Field
The invention belongs to the technical field of special structures, and particularly relates to a construction technology for a novel combined structure cross arm suitable for power transmission towers in various places by combining a reinforced fiber composite (FRP) rib with an angle steel member.
Background
Electric power is used as an important secondary energy source, plays a very important role in the processes of vigorous economic development and rapid improvement of living standard of people, and the consumption demand of the electric power is increased day by day. In order to solve the problems of resource exhaustion and increasingly outstanding energy demand, long-distance power energy transmission plays a very large role, however, the transmission loss is large due to the long transmission distance. Therefore, the high-voltage transmission line which can not only solve the energy loss generated by long-distance transmission but also realize large-capacity transportation overcomes the difficulties, becomes an effective transmission corridor for saving precious energy and improves the actual utilization rate of the energy.
A transmission tower line system used as a carrier for transmitting electric energy often passes through canyons, rivers and areas with multiple rimes, and has large altitude difference and harsh natural environment. At present, a large amount of steel is adopted as a material of the power transmission tower, and a great deal of difficulty is brought to steel production, construction, transportation and operation maintenance. Meanwhile, the high-voltage power transmission tower is in a severe natural environment for a long time in a service period, materials of a power transmission tower line system are gradually corroded and degraded, and then the effect of continuous and alternating environmental loads (such as wind loads and the like) is considered, so that the structure can generate fatigue damage accumulation, the resistance and the performance of the system are gradually degraded, the capability of the structure for resisting the extreme environmental effect is reduced, the reliability of the structure system is reduced, and accidents are caused. In other words, the effects of the atmospheric environment such as corrosion, temperature change, wind-induced fatigue, etc. are not a direct cause of a failure in the power transmission tower system, but are a very important factor and are not negligible. Therefore, ensuring the safety of the power transmission tower line system plays a crucial role in ensuring the safe operation of the power system, and the development of a design method and a construction technology of a power transmission tower by using a novel material on the basis of the cost analysis of the whole life cycle is a future development trend.
In recent years, the adoption of novel high-performance green and environment-friendly materials to replace steel has attracted much attention. The reinforced fiber composite material has the advantages of high strength, light weight, corrosion resistance, good chemical stability, strong designability, good insulating property and the like, is more and more taken as important in the engineering industry, and has been subjected to a large number of engineering application demonstration in the petroleum, chemical, bridge and building industries. Meanwhile, the mechanical properties of the reinforced fiber composite material are gradually improved along with the continuous improvement and development of the production process, and the adoption of the reinforced fiber composite material in the construction of a power transmission tower becomes possible. The advantages of applying the reinforced fiber composite material to the construction of the power transmission tower are mainly embodied in two aspects: on one hand, the power transmission tower is built by adopting the reinforced fiber composite material, so that steel can be saved, the environment can be protected, and the corrosion resistance, the insulativity and the fatigue resistance of the reinforced fiber composite material can be fully utilized; on the other hand, the possibility of being stolen is low when the power transmission tower is built by adopting the reinforced fiber composite material, the material is non-toxic and can be repeatedly utilized, and the environmental friendliness of the line is enhanced. Obviously, the reinforced fiber composite material can effectively reduce or avoid corrosion damage and wind-induced fatigue damage of the power transmission tower, prolong the service period of the power transmission tower, and reduce the operation and maintenance cost, thereby solving the corridor problem of the power transmission line.
Related research has been conducted in the prior art regarding the use of reinforced fiber composites in power transmission lines, but primarily resin-based glass fiber composite (GFRP) poles are employed. The resin is generally processed by adopting an epoxy resin curing system with better comprehensive performance as a matrix material and adopting a continuous fiber winding forming process. However, the GFRP telegraph pole is high in cost, poor in ageing resistance and short in service life due to the problems of process technology and resin formula, and FRP cannot be applied to actual transmission line engineering. Nowadays, with the continuous improvement of the mechanical properties of resin and fiber materials and the improvement of production processes and manufacturing techniques, reinforced fiber composite (FRP) poles are receiving attention from the power transmission industry again. The additive is utilized to improve the aging resistance of the matrix value, CFRP, GFRP, BFRP and various FRP are mixed and used as reinforced fiber materials to improve the mechanical property of the materials, and the production is carried out by adopting a pultrusion or winding forming process. Therefore, the current novel FRP telegraph pole not only has high bearing capacity and good deformability, but also has low cost.
In recent years, as the reinforced fiber composite material has obvious advantages, the strength and specific modulus are several times higher than those of steel and other metals, and the light weight, corrosion resistance and fatigue resistance are very suitable for mountain tower or bridge engineering. Therefore, with the improvement of the production process of the reinforced fiber composite material and the improvement of the material properties, research and application of the reinforced fiber composite material in the power transmission tower have been started in the prior art.
Regarding the mechanical characteristics of power transmission towers, it has been mentioned that environmental corrosion and wind-induced fatigue damage are adverse factors difficult to overcome by the degradation of mechanical properties of power transmission tower body members such as angle steels and steel pipes, and the tensile properties of various reinforced fiber composite materials (FRP) are generally stronger than the compressive properties thereof, and if the reinforced fiber composite materials (FRP) are adopted completely, the material waste is caused. Therefore, on the premise of fully considering the stress condition of the power transmission tower body, the invention provides a method for combining and building by adopting the reinforced fiber composite material (FRP) and the angle steel member aiming at the key part, namely the cross arm of the power transmission tower, in the power transmission tower, wherein the key part is easy to generate corrosion damage and fatigue damage.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for manufacturing an FRP bar-angle steel composite cross arm for a power transmission tower, comprising the 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;
and step three, assembling and connecting the tensioned FRP members on the upper parts of the cross arms, namely connecting one ends of upper chords of two parallel cross arm FRP bars with the power transmission tower body, connecting the other ends of the upper chords of the cross arm FRP bars with the lower stressed angle steel members of the cross arms by adopting a steel node plate and a high-strength bolt, wherein a certain angle is formed between the upper chords of the cross arm FRP bars and the lower chords of the angle steel, connecting one ends of vertical web members of the FRP bars with the upper chords of the cross arm FRP bars, and connecting the other ends of the vertical web members with the lower chords of the angle steel, wherein the horizontal web members of the FRP bars between the upper chords of the two parallel cross arm FRP bars need to be in cross arrangement and connection, wherein the length of the lower stressed angle steel members of the cross arms is increased, and the length of the upper chord members of the cross arms is shortened, so that the assembled cross arms are integrally inclined upwards by a fixed angle α.
Preferably, 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 connection of a high-strength L-shaped steel plate of a node connection 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.
Preferably, in the third step, the two ends of the vertical web members of the FRP bars are respectively inserted into the high-strength steel sleeves of the node connecting members, the vertical web members of the FRP bars and the high-strength steel sleeves are bonded by epoxy resin glue, and meanwhile, the high-strength bolts are screwed into the bolt holes of the high-strength steel sleeves to extrude the FRP bars, the high-strength steel plate of the node connecting member at one end connected with the vertical web members of the FRP bars is connected with the upper chord members of the cross arm FRP bars through the steel node plate, and the high-strength steel plate of the node connecting member at the other end is connected with the lower chord members of the angle steels through the steel node plate, wherein the vertical web members of the FRP bars are vertically and crossly arranged between the upper chord members of.
Preferably, in the third step, the horizontal web members of the FRP ribs are connected in a crossed manner in the following manner: the both ends of FRP muscle horizontal web member insert respectively in the steel casing pipe that excels in of node connecting elements, adopt epoxy glue to bond between FRP muscle horizontal web member and the steel casing pipe that excels in, twist high strength bolt extrusion FRP muscle again in the bolt hole of steel casing pipe that excels in simultaneously, the high strength steel sheet of the node connecting elements of the one end of being connected with FRP muscle horizontal web member passes through the steel node plate and is connected with the cross arm FRP muscle upper chord member of one side, the high strength steel sheet of the node connecting elements of the other end passes through the steel node plate and is connected with the cross arm FRP muscle upper chord member of opposite side, wherein, vertical cross arrangement has many FRP muscle horizontal web members between the cross arm FRP muscle upper chord member of two parallels.
Preferably, the FRP bar is made of any one of a carbon fiber reinforced fiber composite material CFRP, a basalt fiber reinforced fiber composite material BFRP, and a glass fiber reinforced fiber composite material GFRP.
Preferably, the steel node plate adopted for connecting the upper chord member 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, 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.
Preferably, the lower chord of the angle steel of the cross arm lower compression angle steel member is an angle steel member with strength grade of Q345, Q420 or Q460, the horizontal angle steel web member between the lower chord of the angle steel is an equal-side angle steel member with strength grade of Q345, Q420 or Q460, and the lower chord of the angle steel and the horizontal angle steel web member are connected by high-strength bolts and steel node plates.
The invention at least comprises the following beneficial effects: according to the invention, the cross arm of the power transmission tower is built by adopting a combined structure of angle steel and reinforced fiber composite (FRP) ribs, and all components are connected into a whole through the novel node provided by the invention, so that the cross arm structure of the power transmission tower with good coordination working capability and high stability is formed. The invention combines the two materials, and makes full use of the stronger tensile bearing capacity of a reinforced fiber composite material (FRP) and the stronger compressive bearing capacity of angle steel; the reinforced fiber composite material (FRP) is adopted as the tensile member of the cross arm, so that the occurrence and development of fatigue damage of the cross arm caused by long-term wind-induced vibration of the lead can be effectively improved; the reinforced fiber composite material (FRP) delays or avoids the occurrence of environmental corrosion, thereby slowing down the influence of corrosion fatigue coupling damage on the mechanical property degradation speed of the tension member of the cross arm; the bearing capacity of the crosspiece is improved due to the upward inclined structure of the compression angle steel component at the lower part of the cross arm; the invention is beneficial to realizing the application of the novel reinforced fiber composite material in the construction of the power transmission tower, thereby improving the durability of the power transmission tower.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a three-dimensional schematic view of an FRP rib-angle steel combined cross arm of the invention;
FIG. 2 is a three-dimensional schematic view of a node connecting member of the present invention;
FIG. 3 is a three-dimensional schematic view of an FRP rib with a node connecting member according to the present invention;
FIG. 4 is a schematic view of the connection between the upper chord of the cross arm FRP rib and the horizontal web of the FRP rib in the invention;
FIG. 5 is a schematic view of a connection node between a lower chord of an angle steel and a web of a horizontal angle steel in the present invention;
FIG. 6 is a schematic view of a connecting joint between an FRP rib and an FRP rib horizontal web member of an upper end cross arm of the tower of the present invention and a tower body angle steel.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Fig. 1 to 6 show an FRP rib-angle steel combined cross arm for a power transmission tower, which is provided by the invention, and a manufacturing method of the FRP rib-angle steel combined cross arm comprises the following steps:
step one, manufacturing a cross arm component: an equilateral angle steel component is adopted to manufacture two parallel angle steel lower chords 1 at the lower part of the cross arm and a horizontal angle steel web member 2 connected between the two parallel angle steel lower chords; the method comprises the following steps of manufacturing two parallel cross arm FRP rib upper chords 3, FRP rib horizontal web members 4 and FRP rib vertical web members 5, wherein the two parallel cross arm FRP rib upper chords are connected with each other, and the FRP rib vertical web members 5 are connected between the cross arm FRP rib upper chords 3 and the angle steel lower chords 1; processing and manufacturing a node connecting member 6 for connecting a cross arm FRP rib upper chord 3, an FRP rib horizontal web member 4, an FRP rib vertical web member 5 and an angle steel lower chord 1, wherein one end of the node 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 of the node connecting member is a high-strength steel sleeve 62 with a certain number of screw holes and a high-strength bolt matched with the screw holes;
step two, assembling and connecting steel members with compression angles at the lower parts of the cross arms, namely connecting a plurality of angle steel lower chords 1 by adopting high-strength bolts and steel node plates 7, simultaneously connecting two parallel angle steel lower chords 1 with horizontal angle steel web members 2, connecting fixed angle steel 10 perpendicular to the angle steel lower chords 1 at one ends of the two parallel angle steel lower chords 1 by bolts to form a lower compression angle steel member of the cross arm of the high-voltage power transmission tower, wherein the horizontal angle steel web members 2 between the angle steel lower chords 1 are required to be arranged in a crossed manner to form a stable horizontal supporting system for the two lower chords, one ends of the two parallel angle steel lower chords 1 are connected to the body of the power transmission tower, the other ends of the two parallel angle steel lower chords are connected with two parallel cross arm FRP rib upper chords, and the horizontal angle steel web members of the angle steel lower chords are inclined upwards to form a fixed angle α,
and step three, assembling and connecting the tensile FRP members on the upper parts of the cross arms, namely connecting one ends of two parallel upper chords 3 of the FRP ribs with angle steel of a vertical power transmission tower, connecting the other ends of the two upper chords 3 with the lower part of the cross arms by adopting a steel node plate 7 and a high-strength bolt, wherein the two parallel upper chords 3 of the FRP ribs form a certain angle with two parallel lower chords 1 of the angle steel, connecting one ends of vertical web members 5 of the FRP ribs with the upper chords 3 of the FRP ribs, and connecting the other ends of the vertical web members with the lower chords 1 of the angle steel, and connecting the horizontal web members 4 of the FRP ribs between the upper chords 3 of the two parallel cross arms in a crossed manner, wherein the length of the lower part of the cross arm is increased, the length of the upper part upper chords 3 of the cross arms is shortened, so that the assembled cross arms are integrally inclined upwards by a fixed angle α, thereby eliminating the overlarge deflection deformation of the cross arms under the action of gravity or vibration load of the power transmission lines.
According to the technical scheme, the reasonable matching of the reinforced fiber composite material FRP and the angle steel is adopted, so that the bearing and deformation capacity of the cross arm is changed, the durability of the cross arm is improved, the cross arm is inclined upwards by a fixed angle α, the bearing capacity of the cross arm can be obviously improved, the reinforced fiber composite material FRP is good in insulating property, strong in corrosion resistance and wind-induced fatigue resistance, the service life of the cross arm is prolonged, the durability of the cross arm is improved, the cross arm is stressed complexly, the reinforced fiber composite material (FRP) is used as a tension member, the angle steel is used as a compression member, the mechanical properties of different materials in a combined structure are fully utilized, and the cross arm has the characteristics of novel and attractive structure form, short construction period, energy conservation, material conservation, environmental protection and the like.
In the above technical solution, in the third step, the manufacturing process of the two parallel upper chords 3 of the cross arm FRP bars is as follows: the two ends of the upper chord 3 of the cross arm FRP bar are respectively inserted into a high-strength steel sleeve 62 of a node connecting member 6, the high-strength steel sleeve 62 and the upper chord 3 of the cross arm FRP bar are bonded by epoxy resin adhesive, and simultaneously, a high-strength bolt is screwed into a screw hole of the high-strength steel sleeve 62 to extrude the FRP bar, so that the connection between the FRP bar and the high-strength steel sleeve 62 is enhanced, the upper chord 3 of the cross arm FRP bar is formed by connecting a high-strength steel plate 61 of the node connecting member at the two ends with a steel node plate 7, one end of the upper chord of the cross arm FRP bar is connected with a compression angle steel member at the lower part of the cross arm by connecting a high-strength L-shaped steel plate 63 of the node connecting member 6 on the upper chord of the cross arm with the steel node plate 7 by a high-strength bolt, a steel plate at the other side of the steel node plate is connected with a high-strength bolt at the lower part of the cross arm, a steel plate at the other side of, the high-strength L-shaped steel plate 63 can be connected with the lower pressed angle steel of the cross arm and can also be connected with the FRP rib horizontal web member 4; the high-strength steel plate 61 of the node connecting component 6 at the other end of the upper chords 3 of the two parallel cross arm FRP bars is connected with the angle steel on the vertical power transmission tower through the steel node plate 7 and the node high-strength steel plate 9.
In the above technical solution, in the third step, two ends of the vertical web member 5 of the FRP rib are respectively inserted into the high-strength steel sleeve 62 of the joint connecting member 6, the vertical web member 5 of the FRP rib and the high-strength steel sleeve 62 are bonded by using epoxy resin glue, and then the high-strength bolt is screwed into the bolt hole of the high-strength steel sleeve to extrude the FRP rib, the high-strength steel plate 61 of the joint connecting member 6 at one end connected with the vertical web member 5 of the FRP rib is connected with the upper chord member 3 of the cross arm FRP rib through the steel joint plate 7, the high-strength steel plate 61 of the joint connecting member 6 at the other end is connected with the lower chord member 1 of the angle steel through the steel joint plate 7, wherein a plurality of vertical web members 5 of the FRP rib are vertically and crossly arranged between the upper chord member 3.
In the above technical solution, in the third step, the horizontal web members 4 of the FRP ribs are connected in a crossed manner: the two ends of the FRP rib horizontal web members 4 are respectively inserted into the high-strength steel sleeve 62 of the node connecting member 6, the FRP rib horizontal web members 4 are bonded with the high-strength steel sleeve 62 by epoxy resin glue, and meanwhile, the high-strength bolts are screwed into the bolt holes of the high-strength steel sleeve to extrude the FRP ribs, the high-strength steel plate 61 of the node connecting member 6 at one end connected with the FRP rib horizontal web members 4 is connected with the high-strength steel plate 61 of the node connecting member 6 of the upper chord member 3 of the cross arm FRP rib at one side through the steel node plate 7, the high-strength steel plate 61 of the node connecting member 6 at the other end is connected with the high-strength steel plate 61 of the node connecting member 6 of the upper chord member 3 of the cross arm FRP rib at the other side through the steel node plate 7, wherein a plurality of FRP rib horizontal web members 4 are vertically and crossly arranged between the upper chord members.
In the above technical scheme, the FRP bar is made of any one of a carbon fiber reinforced fiber composite material CFRP, a basalt fiber reinforced fiber composite material BFRP, and a glass fiber reinforced fiber composite material GFRP.
In the technical scheme, the cross arm FRP rib upper chord 3, the FRP rib horizontal web member 4, the FRP rib vertical web member 5, the steel gusset plate 7 adopted for connecting the angle steel lower chord 1, the high-strength steel plate 61 of the gusset connection member and the high-strength steel plate of the high-strength steel sleeve 62 are all high-strength steel with the strength grade of Q345, Q420 or Q460.
In the technical scheme, the lower chord 1 of the angle steel of the cross arm lower part compression angle steel component adopts an angle steel component with the strength grade of Q345, Q420 or Q460, the horizontal angle steel web 2 between the lower chord 1 of the angle steel adopts an equal-side angle steel component with the strength grade of Q345, Q420 or Q460, and the lower chord 1 of the angle steel and the horizontal angle steel web 2 of the angle steel are connected by high-strength bolts and steel node plates 7.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184344.7A CN109113411B (en) | 2018-10-11 | 2018-10-11 | Manufacturing method of FRP (fiber reinforced plastic) rib-angle steel combined cross arm for power transmission tower |
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| CN112431471A (en) * | 2020-11-30 | 2021-03-02 | 贵州电网有限责任公司 | Open-hole type corrosion prevention device for wire cross arm node of weather-resistant steel power transmission tower |
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| CN103452370B (en) * | 2012-10-25 | 2015-12-16 | 江苏神马电力股份有限公司 | Power grid transmission line complex pole tower and compound cross-arm structure thereof |
| CN103291114B (en) * | 2013-05-09 | 2015-11-11 | 国家电网公司 | A kind of fiber hybrid composite cross-arm |
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