Super-large-range direct-current power transmission tower for steep mountainous area

Abstract

The invention relates to the field of power transmission line engineering, in particular to a super-large-range direct-current power transmission tower for a steep mountainous area. The tower comprises a tower leg, a tower leg extension section, a tower body and a tower head which are sequentially connected from bottom to top, a ground wire cross arm is horizontally arranged at the top of the tower head; a ground wire hanging point is arranged on the ground wire cross arm; the ground wire hanging point is connected with a ground wire; jumper wire supports are arranged at the two ends of the ground wire cross arm. Jumper hanging points are symmetrically arranged on the outer sides of the jumper supports. Wire cross arms are symmetrically arranged on the tower body along the central axis; wire hanging points are symmetrically arranged on the outer sides of the end parts of the wire cross arms; the wire hanging point is connected with the wire; the power transmission tower further comprises lead jumpers, the lead jumpers are L-string jumpers, one ends of the lead jumpers are connected with the jumper hanging points, and the other ends of the lead jumpers are connected with the lower plane of the ground wire cross arm. The wire and the wire jumper are connected in an upward winding mode. The power transmission tower can be suitable for direct-current power transmission line projects in large-height-difference areas.

Description

Technical Field

[0001] The invention relates to the field of power transmission line engineering, and in particular to a DC power transmission tower with a large step difference used in steep mountainous areas. Background Art

[0002] Overhead transmission line projects, especially when using direct current transmission for long-distance power transmission, often need to cross various types of topography and geological sections. Affected by the special geographical environment, overhead transmission lines often face steep terrain, large tower slopes, and large tower leg differences when crossing mountains.

[0003] In conventional UHV DC transmission lines, transmission towers are generally arranged in a "trunk" shape, and jumpers are arranged in a "V" string under the conductor crossarm. For tower locations in steep mountainous areas, the pole conductors on the side close to the mountain may need to increase the tower height due to insufficient jumper clearance to the ground. In addition, tension towers mainly bear longitudinal loads, and the slope of their tower bodies is generally large. When the tower height increases, the leg root opening will also increase accordingly, which will further increase the height difference between different tower legs. In order to adapt to the slope requirements of steep mountainous terrain, it is often necessary to raise the foundation or perform large-scale base surface opening measures, which not only increases the cost of foundation construction, but also aggravates the degree of damage to the environment. Therefore, it is necessary to specially handle the existing conventional transmission tower structure to meet the construction requirements of large-step transmission towers in steep mountainous areas. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a DC transmission tower with ultra-large step difference for steep mountainous areas, which is suitable for DC transmission line projects in areas with large step difference.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a DC transmission tower for ultra-large step-down in steep mountainous areas, which comprises, from bottom to top, tower legs, tower leg extensions, a tower body, and a tower head connected in sequence; a ground wire cross arm is horizontally arranged on the top of the tower head; a ground wire hanging point is arranged on the ground wire cross arm; the ground wire hanging point is connected to the ground wire; jumper brackets are arranged at both ends of the ground wire cross arm; jumper hanging points are symmetrically arranged on the outside of the jumper brackets; conductor cross arms are symmetrically arranged on the tower body along the central axis; conductor hanging points are symmetrically arranged on the outside of the ends of the conductor cross arms; the conductor hanging point is connected to the conductor; the transmission tower also includes a conductor jumper, one end of the conductor jumper is connected to the jumper hanging point, and the other end is connected to the lower plane of the ground wire cross arm; the conductor is connected to the conductor jumper.

[0006] Preferably, the tower legs are all-round high and low legs; a tower leg extension section is provided between the longest tower leg and the tower body.

[0007] Preferably, the slope of the tower leg extension section is the same as the slope of the tower leg.

[0008] Preferably, the tower leg extension section is connected to the tower body and the longest tower leg by means of internal angle steel and external plate-type bolts.

[0009] Preferably, the tower leg extension section is arranged as a cross material using diagonal materials.

[0010] Preferably, the wire jumper is of an "L" string type, and the wire is connected to the wire jumper in a Shangrao type.

[0011] Preferably, the jumper bracket and the ground wire cross arm are perpendicular.

[0012] Preferably, the tower body bottle mouth adopts a one-time slope change form; the bottle mouth slope change point is arranged below the conductor cross arm.

[0013] Preferably, the tower legs are connected to the ground foundation via anchor bolts.

[0014] In a second aspect, the present invention provides a method for installing a DC transmission tower with a large step difference in steep mountainous areas, comprising: Determine the lowest hanging point height of the transmission tower; determine the tower leg height and the length of the tower leg extension section according to the lowest hanging point height; determine the location of the foundation pit according to the topography of the tower base; excavate the foundation pit, construct the foundation and pour concrete, and embed the anchor bolts at the same time; after the foundation construction is completed and the concrete reaches the specified strength requirements, use the ground-mounted rocker arm to assemble the transmission tower, assemble the longest tower leg and tower leg extension section in sequence until the height of the remaining tower legs is reached, and then assemble the remaining tower legs simultaneously; after the tower legs are assembled, assemble the tower body and tower head above the tower legs in sequence, and hoist the conductor crossarm, ground wire crossarm and jumper bracket; after the transmission tower is assembled, carry out conductor and ground wire stringing and wire tightening operations, and install conductor jumpers and spacers.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention increases the height of the jumper by arranging the jumper bracket at the ground wire cross arm, avoids the jumper string being too close to the side of the steep mountain, resulting in insufficient distance to the ground and forced to increase the tower height, thereby reducing the height of the wire hanging point of the pole tower and reducing the weight of the transmission tower.

[0016] Furthermore, by adding tower leg extension sections at the tower legs, the step difference range of the high and low legs of the tower is increased, avoiding the problems of too small angles between the main materials and the diagonal materials of the long-leg tower legs and flat diagonal materials of the short-leg tower legs; at the same time, by increasing the step difference between the tower legs, excessive squaring of the short leg base surface is avoided, reducing damage to the ecological environment, avoiding high outcrops on the long leg foundation, and facilitating construction units to carry out high-support formwork construction on steep mountainous areas, thereby reducing construction risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is the main view of the transmission tower of the large-step-difference DC transmission line; Figure 2 It is a schematic diagram of the arrangement of conductor jumpers of transmission towers for large-step-difference DC transmission lines; Figure 3 Schematic diagram of the tower leg difference before and after adding tower leg extension section to the transmission tower; Figure 4 It is a schematic diagram of the structure of the tower leg extension section; Figure 5 for Figure 4 Schematic diagram of the AA section; Figure 6 for Figure 4 Schematic diagram of the middle BB section; Figure 7 Schematic diagram of adding horizontal partitions to the tower legs; Figure 8 for Figure 7 Schematic diagram of the CC section.

[0019] Among them: 1. Ground wire crossarm; 2. Jumper bracket; 3. Conductor crossarm; 4. Tower head; 5. Tower body; 6. Tower leg extension section; 7. Tower leg; 8. Conductor jumper. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings: The first object of the present invention is to provide a DC transmission tower for use in steep mountainous areas with large step differences, such as Figure 1 and Figure 2 As shown, the super-large differential transmission tower of the present invention comprises, from bottom to top, a tower leg 7, a tower leg extension section 6, a tower body 5, and a tower head 4 which are connected in sequence; a ground wire cross arm 1 is horizontally arranged on the top of the tower head 4; a ground wire hanging point is arranged on the ground wire cross arm 1; the ground wire hanging point is connected to the ground wire; jumper brackets 2 are arranged at both ends of the ground wire cross arm 1; jumper hanging points are symmetrically arranged on the outside of the jumper bracket 2; conductor cross arms 3 are symmetrically arranged on the tower body 5 along the central axis; conductor hanging points are symmetrically arranged on the outside of the ends of the conductor cross arms 3; the conductor hanging points are connected to the conductor; the transmission tower also includes a conductor jumper 8, one end of the conductor jumper 8 is connected to the jumper hanging point, and the other end is connected to the lower plane of the ground wire cross arm 1; the conductor is connected to the conductor jumper 8.

[0027] The present invention enables the transmission tower to bear greater vertical and horizontal loads through the tower legs 7, and provides stable foundation support; the tower body 5 enables the transmission tower to better distribute the load, avoid uneven settlement and structural deformation; through the conductor cross arm 3 symmetrically arranged along the central axis, the tower body 5 can effectively support the upper structure, enhance the strength and stability of the transmission tower, especially under the action of external factors such as wind or earthquake, it can ensure the safety of the transmission tower. In addition, the conductor cross arm 3 is arranged without closing, and the end is reserved for the conductor hanging point and the construction hole according to the size of the conductor hanging point; the conductor hanging point outside the end of the conductor cross arm 3 is connected to the conductor, and the conductor is arranged horizontally, and the conductor protection angle meets the requirements of the regulations and specifications, ensuring the reliable transmission of the transmission line. A ground wire cross arm 1 is arranged on the top of the tower head 4, and a ground wire hanging point is arranged on the ground wire cross arm 1, which can directly connect the ground wire. The ground wire is arranged horizontally, which can prevent the electrical equipment of the line from being damaged due to lightning strikes and other reasons. The present invention arranges the jumper bracket 2 at the end of the ground wire cross arm 1, which increases the height of the jumper, avoids the jumper string being too close to the side of the steep mountain, resulting in insufficient distance to the ground and forced to increase the tower height, reduces the height of the wire hanging point of the pole tower, and reduces the weight of the iron tower.

[0028] In addition, the tower legs 7 include all-round high and low legs; the level difference between the all-round high and low legs is considered to be 1m. Through a reasonable tower leg 7 structure, the transmission tower can better adapt to the challenges of geological conditions and natural environment in the complex terrain of steep mountainous areas, ensuring the stability of the entire tower body.

[0029] For example, Figures 3 to 6 As shown, a tower leg extension section 6 is arranged between the longest tower leg 7 and the tower body 5. The height of the tower leg extension section 6 is adjusted according to actual needs, and the height is considered to be 7.5m~10.5m. No joint is separately arranged inside the tower leg extension section 6, and at the same time, it is ensured that the angle between the main material and the diagonal material of the longest tower leg 7 is not less than 19°; at the same time, the tower leg extension section 6 can be designed to have different extension lengths to adapt to the terrain slope of the actual tower position. The main material and the diagonal material of the extension section are connected by cross materials, and auxiliary materials are used to reduce the calculated slenderness ratio of the main material. The V-face of the extension section also adopts the cross material arrangement type, and the front and side diagonal materials are connected by connecting plates, and the connecting plates are curved according to the V-face angle.

[0030] like Figure 7 and Figure 8As shown, after the tower leg extension section 6 is added to the long leg side of the present invention, when the length of the tower leg 7 joint exceeds 3 sections, a subdivided structure can be used to set a horizontal partition at the lower end of the extension section to increase the torsion resistance of the extension section. The tower leg extension section 6 is connected to the tower body 5 and the longest tower leg 7, the tower leg 7 diagonal material and the horizontal partition cross material by internal angle steel and external plate bolts, which not only reduces the number of welding, but also effectively improves the tensile strength and shear strength of the connection parts, ensures the close connection between the various parts of the structure, avoids the connection parts from loosening or damage under heavy load, and further enhances the overall stability of the tower body.

[0031] For example, the ground wire cross arm 1 and the jumper bracket 2 are arched as a whole, and the pre-arch value is rounded to 1 / 100 of the cantilever length. By arching the whole, the sagging effect caused by the load (such as deadweight, construction and installation, temperature change, etc.) can be offset in advance, ensuring that the shape of the ground wire cross arm 1 and the jumper bracket 2 in actual work is more reasonable and uniform. The setting of the pre-arch value can enable the structure to maintain a good force distribution when bearing loads, avoiding equipment damage or line failure caused by excessive sagging or uneven force on the ground wire.

[0032] The present invention can meet the requirement of large level difference of tower legs 7 in steep mountainous areas by setting tower leg extension section 6 in the long leg section to increase the level difference range between the high and low legs of the iron tower, avoid the problem of too small angle between the main material and the diagonal material of the long leg tower leg and flat diagonal material of the short leg tower leg, and optimize the structural force pattern of the tower leg 7. At the same time, in steep mountainous areas with large height difference, the length difference of tower legs 7 is large, and the design of tower leg extension section 6 can provide a more flexible structural adjustment method without increasing too much construction difficulty; specifically, by increasing the level difference between tower legs 7, excessive squaring of the short leg base surface is avoided, reducing the damage to the ecological environment; secondly, it can also avoid the high outcropping of the long leg foundation, reducing the difficulty of foundation construction of the construction unit, and is suitable for DC transmission line projects in areas with large height difference.

[0033] Exemplarily, the slope of the tower leg extension section 6 is the same as the slope of the longest tower leg 7 to match tower legs 7 of different lengths, thereby ensuring the consistency of the overall geometric shape and force mode of the entire transmission tower, and effectively distributing vertical and horizontal loads, so that the tower body is more stable under various environmental conditions, especially in steep mountainous areas, and can better adapt to complex terrain conditions; in addition, the force state of the tower leg 7 remains consistent, which helps to reduce the structural deformation caused by uneven force and improves the bearing capacity of the tower body.

[0034] The present invention places a jumper bracket 2 in a "T"-shaped structure on the upper part of the conductor crossarm 3, and the conductor is connected to the conductor hanging point of the lower conductor crossarm 3 by using double-jointed hardware. The conductor jumper 8 adopts a cage-type hard jumper winding method, and is wound and connected to the front and rear side conductors in three sections. The conductor jumper 8 is installed with a jumper spacer from the tension string outlet to the end of the squirrel cage frame. The installation position of the spacer is determined according to actual conditions, so that the jumper can be smoothly and beautifully formed to prevent distortion or rigid deformation. The gap requirements should be met after the jumper is installed.

[0035] The conductor jumper 8 of the present invention is of "L" string type, and the double jumpers are arranged symmetrically front and back. Each pole conductor adopts double "L" string. In order to avoid the distance to the ground controlled by the jumper gap of the transmission tower, the conductor is connected to the "L" string conductor jumper 8 in an upward manner. By raising the jumper height, it is avoided that the jumper close to the steep mountain side does not meet the ground distance requirement, thereby reducing the conductor hanging point height of the pole tower.

[0036] Exemplarily, the jumper bracket 2 is triangular cone-shaped and is arranged perpendicular to the ground wire crossarm 1, which can effectively optimize the structural form of the bracket and improve the overall stability. The triangular cone bracket design has strong mechanical stability, can withstand large loads and ensure long-term reliability. At the same time, the overhanging length of the bracket is reasonably adjusted according to the length of the V string, which effectively reduces the outward angle of the V string connection plate, thereby reducing the stress concentration at the connection part and avoiding structural instability or damage caused by excessive angles. In addition, reducing the outward angle can also effectively improve the overall coordination of the connection point, reduce the difficulty of line maintenance, ensure the smooth operation of the entire line system, and adapt to the requirements for accuracy and stability in different power projects.

[0037] The tower body 5 adopts a square cross section, and the bottle mouth of the tower body 5 adopts a single slope change form, and the bottle mouth slope change point is set below the conductor cross arm 3. The single slope change form avoids the structural complexity caused by multiple slope changes, thereby simplifying the tower body design and reducing the difficulty of manufacturing and construction. Setting the slope change point below the conductor cross arm 3 helps to optimize the stress condition of the tower body 5, making the force transmission between the conductor and the tower body 5 more uniform, and reducing the potential risk caused by excessive local stress on the tower body 5.

[0038] Secondly, in order to avoid the same pressure of the cross materials of the tower body 5, the lower part of the ground wire cross arm 1 and the conductor cross arm 3 adopts inverted "K" material. The use of inverted "K" material can effectively avoid the same pressure problem caused by the cross materials being compressed against each other in the traditional structure, thereby reducing the local weakness of the tower body 5 structure and improving the overall stability.

[0039] The tower legs 7 are connected to the ground foundation via anchor bolts. As connecting members, the anchor bolts have high tensile strength and shear strength, are easy to construct, and can effectively resist the effects of external loads (such as wind, earthquake, etc.) on the tower body 5, thereby preventing loosening or displacement between the tower legs 7 and the foundation.

[0040] In summary, the present invention increases the height of the conductor jumper 8 by arranging the jumper bracket 2 at the ground wire crossarm 1, avoids the jumper string being too close to the side close to the steep mountain, resulting in insufficient distance to the ground and forced to increase the tower height, thereby reducing the conductor hanging point height of the pole tower and reducing the weight of the transmission tower; by adding a tower leg extension section 6 at the long-leg tower leg, the step difference range of the high and low legs of the tower is increased, avoids the problems of too small angle between the main material and the oblique material of the long-leg tower leg and flat oblique material of the short-leg tower leg, and optimizes the structural force pattern of the tower leg 7; at the same time, by increasing the step difference between the tower legs 7, excessive squaring of the short leg base surface is avoided, reducing the damage to the ecological environment; increasing the step difference range can also avoid high outcroppings of the long leg foundation, facilitate construction units to construct high-support formwork foundations in steep mountainous areas, and reduce construction risks.

[0041] The second object of the present invention is to provide a method for installing a DC transmission tower with a large step difference in steep mountainous areas, comprising: According to the electrical ranking document, determine the lowest hanging point height of the transmission tower; according to the lowest hanging point height, determine the height of the tower leg 7 and the length of the tower leg extension section 6 of the transmission tower; according to the topography of the tower base, determine the location of the foundation pit; carry out foundation pit excavation, foundation construction and pouring of concrete, and pre-embed the anchor bolts at the same time; according to the half-opening of the foundation of the tower, determine the specific location of the tower leg 7 of the transmission tower; after the foundation construction is completed and the concrete reaches the specified strength requirements, use the ground rocker arm to assemble the transmission tower, assemble the longest tower leg 7 and the tower leg extension section 6 in turn until the height of the remaining tower legs 7 is reached, and then assemble the remaining tower legs 7 simultaneously; after the tower leg 7 is assembled, assemble the tower body 5 and the tower head 4 above the tower leg 7 in turn, and hoist the conductor cross arm 3, the ground wire cross arm 1 and the jumper bracket 2; after the transmission tower is assembled, carry out the conductor and ground wire stringing and tightening operations, and install the conductor jumper 8 and accessories such as spacers.

[0042] The method of the present invention ensures the stability of the tower base and the structural safety of the tower body through precise transmission tower design and construction steps, and improves the stability and reliability of the entire power transmission system. Through reasonable foundation pit excavation, foundation construction, tower body assembly and wire erection, it can effectively improve construction efficiency, reduce construction risks, ensure the long-term stable operation of the tower body under various environmental conditions, and at the same time enhance the wind and earthquake resistance of the line, reduce the safety hazards caused by loose wires or tilted tower bodies, and ensure the efficient and safe operation of the power network.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DC transmission tower with a large step difference for use in steep mountainous areas, characterized in that: From bottom to top, the tower comprises a tower leg (7), a tower leg extension section (6), a tower body (5) and a tower head (4) which are connected in sequence; a ground wire cross arm (1) is horizontally arranged on the top of the tower head (4); a ground wire hanging point is arranged on the ground wire cross arm (1); the ground wire hanging point is connected to the ground wire; jumper brackets (2) are arranged at both ends of the ground wire cross arm (1); jumper hanging points are symmetrically arranged on the outside of the jumper bracket (2); conductor cross arms (3) are symmetrically arranged on the tower body (5) along the central axis; conductor hanging points are symmetrically arranged on the outside of the ends of the conductor cross arm (3); the conductor hanging points are connected to the conductor; the transmission tower also comprises a conductor jumper (8), one end of the conductor jumper (8) is connected to the jumper hanging point, and the other end is connected to the lower plane of the ground wire cross arm (1); the conductor is connected to the conductor jumper (8).

2. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 1, characterized in that: The tower legs (7) are all-round high and low legs; a tower leg extension section (6) is provided between the longest tower leg (7) and the tower body (5).

3. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 2, characterized in that: The slope of the tower leg extension section (6) is the same as the slope of the tower leg (7).

4. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 2, characterized in that: The tower leg extension section (6) is connected to the tower body (5) and the longest tower leg (7) by means of internal angle steel and external plate-attached bolts.

5. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 2, characterized in that: The tower leg extension section (6) is arranged using diagonal materials in a cross-shaped manner.

6. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 1, characterized in that: The wire jumper (8) is of an "L" string type, and the wire is connected to the wire jumper (8) in a Shangrao type.

7. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 1, characterized in that: The jumper bracket (2) and the ground wire cross arm (1) are perpendicular.

8. The DC transmission tower with large step difference for steep mountainous areas according to claim 1, characterized in that: The tower body (5) adopts a one-time slope change at the bottle mouth; the bottle mouth slope change point is arranged below the conductor cross arm (3).

9. A DC transmission tower with a large step difference for use in steep mountainous areas according to claim 1, characterized in that: The tower legs (7) are connected to the ground foundation via anchor bolts.

10. A method for installing a DC transmission tower with a large step difference in steep mountainous areas according to any one of claims 1 to 9, characterized in that: include: Determine the lowest hanging point height of the transmission tower; determine the height of the tower leg (7) and the length of the tower leg extension section (6) of the transmission tower according to the lowest hanging point height; determine the location of the foundation pit according to the topography of the tower base; excavate the foundation pit, construct the foundation and pour concrete, and embed anchor bolts at the same time; after the foundation construction is completed and the concrete reaches the specified strength requirements, use a grounded rocker arm to assemble the transmission tower, assemble the longest tower leg (7) and the tower leg extension section (6) in sequence until the height of the remaining tower legs (7) is reached, and then assemble the remaining tower legs (7) simultaneously; after the tower legs (7) are assembled, assemble the tower body (5) and the tower head (4) above the tower legs (7) in sequence, and hoist the conductor cross arm (3), the ground wire cross arm (1) and the jumper bracket (2); after the transmission tower is assembled, perform conductor and ground wire stringing and tightening operations, and install the conductor jumper (8) and the spacer.

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