Crossing head of power transmission tower and power transmission tower

Abstract

The utility model relates to power transmission system equipment technical field provides a tower head and power transmission tower of cross span power transmission tower, and this tower head includes: tower head main part, tower head main part is equipped with from top to bottom layer arrangement: ground wire cross arm region, is connected with first ground wire cross arm and second ground wire cross arm, span cross arm region is connected with span cross arm, is used for hanging set span conductor, hang net auxiliary cross arm region is connected with hang net auxiliary cross arm, is used for hanging set insulating isolation net, drill through cross arm region is connected with drill through cross arm, is used for hanging set drill through conductor, the projection of drill through cross arm and span cross arm on tower head main part cross section is cross arrangement, and the length direction of first ground wire cross arm and span cross arm is identical, and the length direction of second ground wire cross arm and drill through cross arm is identical, the length direction of hang net auxiliary cross arm and span cross arm or drill through cross arm is identical. Such setting, can solve overhead transmission line cross span problem while giving consideration to practicality, economy and power supply reliability.

Description

Technical Field

[0001] This utility model relates to the field of power transmission system equipment technology, and in particular to a tower head and a power transmission tower that crosses a power transmission tower. Background Technology

[0002] With the continuous development of power grid construction and the continuous improvement of transmission line networks, the crossing scenarios between overhead transmission lines are becoming more and more frequent. How to solve the problem of transmission line crossing in a safe, economical and efficient manner has become an urgent need in power grid engineering construction and operation and maintenance.

[0003] Currently, there are generally three approaches to solving cross-cutting issues in the industry, in order of priority: 1) The first step is to select the crossing point: By choosing a suitable crossing location, we can make full use of the terrain conditions to ensure that there is a sufficient safety distance between different overhead lines. For example, we can use the elevated position of a mountain top to cross an existing low-lying overhead line, or use the low-lying terrain of a valley to build a high-lying overhead line.

[0004] 2) The second is the modification of the original line: that is, to modify the existing overhead line to meet the crossing conditions. For example, if an overhead line under construction is to pass under another existing high-altitude overhead line, the existing overhead line is raised and modified to ensure that there is a sufficient safe distance between it and the line under construction.

[0005] 3) Finally, there is the underground cable renovation: Since the above ideas could not be realized, we were forced to switch to underground cable laying, drilling under the existing overhead line.

[0006] However, in actual construction, it was found that the above-mentioned existing technical solutions all have unavoidable defects in practical applications: 1) Selecting suitable crossing points is usually a priority, but site conditions often lack favorable terrain conditions. For example, in transmission line corridors with limited routes, it is difficult to find advantageous crossing locations. Even in some cases where crossing conditions are technically feasible, other limiting factors (such as planned land use restrictions, ecological red lines, water source protection areas, etc.) may render the crossing point unusable. Ultimately, a detour must be taken to select other locations for crossing, which significantly increases the scale of the project and investment.

[0007] 2) While upgrading the original line avoids detours and circumvents many limiting factors, the upgrade itself requires significant costs. More importantly, upgrading the original line increases the downtime of existing overhead transmission lines. For critical customers (such as hospitals, power plants, and nuclear power plants), the losses caused by power outages are incalculable, coordination is extremely difficult, and project implementation is challenging.

[0008] 3) Undergrounding of cables can perfectly resolve the two fundamental contradictions in overhead transmission lines: "space occupation conflict" and "safe distance guarantee," but its drawbacks are equally prominent: Firstly, the cost of underground cables is relatively high, making them less economical. Compared to overhead lines, the cost per unit length of underground cable is approximately 6 to 10 times that of overhead lines, so the cost of converting cables to underground installations is relatively high.

[0009] Secondly, cable line operation and maintenance costs are high. Cables are buried underground and cannot be "directly observed" like overhead lines. During operation and maintenance, various professional equipment and condition monitoring devices are needed for positioning, tracking and detection, resulting in high maintenance costs.

[0010] Secondly, cable line repair is difficult. Once a cable line fails, the road surface needs to be dug up again, and the faulty section of cable or joint needs to be replaced. If the fault point is located under the main road in the city, a temporary road occupancy permit also needs to be obtained. The repair time is much longer than that required for overhead line repair.

[0011] Finally, the later-stage modification and recycling of cable lines are more difficult. Later-stage modification of cable lines requires excavation and re-laying, with costs roughly the same as new construction; while overhead lines only require adjusting the positions of the poles and towers, with costs only 1 / 10 to 1 / 5 of new construction. The insulation and shielding layers of cables are tightly bonded to the conductor, requiring specialized equipment for stripping during recycling, and the recycling value of insulation materials (such as cross-linked polyethylene) is low; whereas overhead conductors can be directly recycled, with a utilization rate of over 90%, resulting in higher recycling returns.

[0012] Given the above problems, how to solve the problem of overhead transmission line crossings while taking into account practicality, economy and power supply reliability has become an important technical problem that urgently needs to be solved. Utility Model Content

[0013] This utility model provides a tower head and transmission tower for crossing transmission towers, which solves the shortcomings of existing overhead transmission line crossing schemes in terms of practicality, economy and power supply reliability. It can solve the problem of overhead transmission line crossing while taking into account practicality, economy and power supply reliability.

[0014] This utility model provides a tower head for crossing a transmission tower, comprising: a tower head body; The tower head body is provided with layers arranged sequentially from top to bottom: The ground wire crossarm area is connected to the first ground wire crossarm and the second ground wire crossarm. The area spanning the crossarm is connected to the crossing crossarm and is used to hang the crossing conductor; The area with auxiliary crossarms for hanging netting is connected to an auxiliary crossarm for hanging insulating netting; The drilling crossarm area is connected to the drilling crossarm and is used to hang the drilling cross conductor; The drilling crossarm and the crossing crossarm are arranged intersectingly on the cross section of the tower head body. The first ground wire crossarm is in the same length direction as the crossing crossarm, and the second ground wire crossarm is in the same length direction as the drilling crossarm. The wire mesh auxiliary crossarm is in the same length direction as the crossing crossarm or the drilling crossarm.

[0015] According to this utility model, a tower head for crossing a transmission tower is provided, wherein the crossing crossarm includes, arranged in layers from top to bottom: a crossing crossarm for phase A, a crossing crossarm for phase B, and a crossing crossarm for phase C.

[0016] According to this utility model, a tower head for crossing transmission towers is provided, wherein the crossing A-phase crossarm, the crossing B-phase crossarm, and the crossing C-phase crossarm are all provided with hanging points at both ends of their own length direction for hanging conductors of different circuits.

[0017] According to this utility model, a tower head for crossing a transmission tower is provided, wherein the crossarms are arranged in layers from top to bottom: crossarms for phase A, crossarms for phase B and crossarms for phase C.

[0018] According to this utility model, a tower head that crosses a transmission tower is provided, wherein the crossarms of phase A, phase B, and phase C are all provided with hanging points at both ends of their own length direction for hanging conductors of different circuits.

[0019] According to this utility model, a tower head for crossing a transmission tower is provided, wherein the auxiliary crossarm for wire mesh is aligned with the length direction of the crossing crossarm.

[0020] According to this utility model, a tower head for crossing a transmission tower is provided, wherein the spacing between the hanging points at both ends of the auxiliary crossarm is greater than or equal to the maximum spacing between the hanging points at both ends of the crossing crossarm.

[0021] According to this utility model, a tower head for crossing a transmission tower is provided, wherein the crossing crossarm and the length direction of the drilling crossarm are perpendicular to each other.

[0022] According to this utility model, a tower head that crosses over a transmission tower is provided, wherein the first ground wire crossarm is located above the second ground wire crossarm.

[0023] This utility model also provides a transmission tower, including tower legs, tower body, and tower head that crosses the transmission tower as described above, connected sequentially from bottom to top.

[0024] Beneficial effects: I. Significantly Saves Route Resources and Improves Transmission Corridor Space Utilization. In traditional schemes, the route selection of overhead lines is often limited by terrain (such as mountains and rivers) and land use attributes (such as urban planning areas and farmland). According to traditional schemes, each crossing line needs to occupy an independent tower location, and the route width is usually 20-30 meters (including tower safety distance). However, the technical solution provided by this utility model embodiment can transform the "aerial crossing" between overhead lines into an "orderly arrangement on towers." By using "transfer stations" to allocate each overhead line crossing a section to its own space, a single tower can replace the function that traditionally required multiple towers. This significantly saves route resources and land occupation within the transmission corridor, improves the space utilization of the transmission corridor, and reduces the limitations imposed by external environmental factors such as terrain (such as mountains and rivers) and land use attributes (such as urban planning areas and farmland) on the selection of overhead line routes.

[0025] II. Reducing Power Outage Transition Time During Cross-Span Construction. Single-tower crossings, with their core characteristics of "centralized operations and simplified procedures," can significantly shorten power outage transition time. Their advantages stem from two points: first, they eliminate the need for coordination of crossing spans and the connection of procedures between multiple work points required in traditional double-tower crossings; second, this utility model features a netted auxiliary crossarm, and due to its inherent safety features, there is no need to erect a crossing frame. The entire construction process requires only a short power outage or even no power outage at all.

[0026] Third, it reduces project costs and shortens the construction period. Firstly, in terms of material costs, replacing multiple towers with a single tower reduces the amount of steel and foundation concrete used. Secondly, in terms of construction costs, it reduces subsequent tower foundation excavation and tower erection work, especially in complex terrains such as mountainous areas and rivers, avoiding redundant investment in secondary transportation (such as cableway or ship transport). Finally, in terms of construction time, it eliminates the need for later design and construction processes, significantly shortening the overall construction period.

[0027] IV. Simplified Operation and Maintenance Management, Reduced Post-Operation Costs. The core of line operation and maintenance is "inspection, repair, and fault handling," and the single-tower crossing scheme makes operation and maintenance more efficient. First, the single-tower design concentrates inspections, allowing maintenance personnel to simultaneously inspect the conductors and insulators of multiple lines by climbing only one tower, avoiding back-and-forth travel and repetitive work between multiple towers (especially in mountainous areas, reducing the physical exertion of inspection personnel). Second, for convenient maintenance, if a line needs maintenance (such as insulator replacement) or if another phase of the line is being built after the first phase has been completed, an insulating isolation net can be installed on the auxiliary crossarm to achieve live isolation, eliminating the need for "power outage coordination" on the other line (traditional solutions require simultaneous power outages or temporary protection on both lines). Finally, fault location is more convenient. Because the two lines are on the same tower, when a fault occurs (such as insulator flashover), maintenance personnel can quickly locate the fault point, shortening fault handling time (traditional solutions require separate inspections of both towers, which is more time-consuming). Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the transmission tower provided in this embodiment of the utility model.

[0030] Figure 2 This is a front view of the arrangement of various hanging points provided in the embodiment of this utility model.

[0031] Figure 3 This is a side view of the arrangement of various hanging points provided in the embodiment of this utility model.

[0032] Figure 4 This is a schematic diagram of the cooperation between the transmission tower and the insulating isolation net provided in this embodiment of the utility model.

[0033] Figure label: 1. Crossing the tower head of the transmission tower; 10. Tower head body; 101. Crossing the crossarm area; 102. Auxiliary crossarm area; 103. Drilling through the crossarm area; 104. Ground wire crossarm area; 11. Crossing the crossarm; 111. Crossing the A-phase crossarm; 112. Crossing the B-phase crossarm; 113. Crossing the C-phase crossarm; 114. Crossing the A-phase I return point; 115. Crossing the A-phase II return point; 116. Crossing the B-phase I return point; 117. Crossing the B-phase II return point; 118. Crossing the C-phase I return point; 119. Crossing the C-phase II return point; 12. Auxiliary crossarm; 121. First isolation net hanging point; 122. Second isolation net hanging point; 13. Drilling over crossarm; 131. Drilling over A phase crossarm; 132. Drilling over B phase crossarm; 133. Drilling over C phase crossarm; 134. Drilling over A phase I return hanging point; 135. Drilling over A phase II return hanging point; 136. Drilling over B phase I return hanging point; 137. Drilling over B phase II return hanging point; 138. Drilling over C phase I return hanging point; 139. Drilling over C phase II return hanging point; 14. First ground wire crossarm; 141. First ground wire hanging point A; 142. First ground wire hanging point B; 15. Second ground wire crossarm; 151. Second ground wire hanging point A; 152. Second ground wire hanging point B; 2. Insulating isolation net; 3. Tower leg; 4. Tower body. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] To better understand the tower head and transmission tower of the crossing transmission tower provided in this embodiment of the utility model, its application background is first introduced. With the continuous development of power grid construction and the continuous improvement of transmission line networks, the crossing of overhead transmission lines is becoming more and more frequent. Currently, there are generally three approaches in the industry to solve the crossing problem, in order of priority: Firstly, the selection of crossing points: by choosing appropriate crossing locations, the site terrain conditions can be fully utilized to ensure sufficient safe distance between different overhead lines.

[0036] Secondly, the existing overhead lines will be modified to meet the crossing requirements.

[0037] Third, the undergrounding of cables will be carried out, with cables being laid underground and passing under existing overhead lines.

[0038] However, in actual construction, it was found that the above-mentioned existing technical solutions all have unavoidable defects in practical applications: 1) The selection of crossing points is often difficult to implement due to site conditions and external constraints, and its practicality is limited. Choosing other locations to achieve crossing would greatly increase the scale of engineering construction and project investment.

[0039] 2) Upgrading the original line requires a large investment in renovation costs and increases the power outage time of the existing overhead transmission lines. The losses caused by power outages to important customers are incalculable, coordination is extremely difficult, and the project is hard to implement.

[0040] 3) Cables are relatively expensive and have poor economic efficiency. During operation and maintenance, they rely on various professional equipment and condition monitoring devices for positioning, tracking and detection, resulting in high maintenance costs. At the same time, cable lines are difficult to repair and take a long time to repair. In addition, cable lines are difficult to modify and recycle. Modification of cable lines requires excavation and re-laying, and the cost is basically the same as new construction. The insulation layer and shielding layer of the cable are tightly bonded to the conductor, and professional equipment is required to peel them off during recycling. Moreover, the recycling value of insulation materials (such as cross-linked polyethylene) is low.

[0041] In view of the above problems, this utility model provides a tower head and transmission tower for crossing transmission towers, which can solve the problem of overhead transmission lines crossing while taking into account practicality, economy and power supply reliability.

[0042] The following is combined with Figures 1 to 4 This invention describes the tower head and transmission tower of the cross-span transmission tower.

[0043] Reference Figures 1 to 4 A tower head for crossing a transmission tower includes a tower head body 10. The tower head body 10 has a crossing crossarm area 101, a netting auxiliary crossarm area 102, and a drilling crossarm area 103 arranged in layers from top to bottom. The crossing crossarm area 101 is connected to a crossing crossarm 11 for hanging crossing conductors. The netting auxiliary crossarm area 102 is connected to a netting auxiliary crossarm 12 for hanging insulating netting 2. The drilling crossarm area 103 is connected to a drilling crossarm 13 for hanging drilling conductors. The projections of the drilling crossarm 13 and the crossing crossarm 11 on the cross section of the tower head body 10 are arranged intersectingly. The length direction of the netting auxiliary crossarm 12 is consistent with that of the crossing crossarm 11 or the drilling crossarm 13.

[0044] Through the above technical solution, the crossing crossarm 11 located in the crossing crossarm area 101 can be used to hang the crossing conductor, the drilling crossarm 13 located in the drilling crossarm area 103 can be used to hang the drilling conductor, and the netting auxiliary crossarm 12 in the netting auxiliary crossarm area 102 can be used to hang the insulating isolation net 2. This arrangement has at least the following technical effects: 1. Significantly saves route resources and improves the space utilization rate of transmission corridors. In traditional schemes, the route selection of overhead lines is often limited by terrain (such as mountains and rivers) and land use attributes (such as urban planning areas and farmland). According to the traditional scheme, each crossing line needs to occupy an independent tower location, and the route width is usually 20-30 meters (including tower safety distance). However, the technical solution provided by this utility model embodiment can transform the "aerial crossing" between overhead lines into an "orderly arrangement on towers". In the form of a "transfer station", each overhead line crossing is allocated in its own space. One tower replaces the function that traditionally requires multiple towers, thereby significantly saving route resources and land occupation within the transmission corridor, improving the space utilization rate of the transmission corridor, and reducing the restrictions of external environment such as terrain (such as mountains and rivers) and land use attributes (such as urban planning areas and farmland) on the selection of overhead line routes.

[0045] 2. Reduce power outage transition time during cross-span construction. Single-tower crossings, with their core characteristics of "centralized operations and simplified procedures," can significantly shorten power outage transition time. Their advantages stem from two points: first, they eliminate the need for coordination of crossing spans and the connection of procedures between multiple work points required in traditional double-tower crossings; second, this utility model features a netted auxiliary crossarm, and due to its inherent safety features, there is no need to erect a crossing frame. The entire construction process requires only a short power outage or even no power outage at all.

[0046] 3. Reduce project costs and shorten construction period. First, in terms of material costs, replacing multiple towers with a single tower reduces the amount of steel and foundation concrete used. Second, in terms of construction costs, it reduces subsequent tower foundation excavation and tower erection work, especially in complex terrains such as mountainous areas and rivers, avoiding repeated investment in secondary transportation (such as cableway or ship transportation). Finally, in terms of construction time, it eliminates the need for later design and construction processes, significantly shortening the overall construction period.

[0047] 4. Simplify operation and maintenance management and reduce later costs. The core of line operation and maintenance is "inspection, repair, and fault handling." The single-tower crossing scheme makes operation and maintenance more efficient. First, the single-tower design concentrates inspections. Maintenance personnel only need to climb one tower to simultaneously check the condition of conductors and insulators of multiple lines, avoiding back-and-forth travel and repetitive work between multiple towers (especially in mountainous areas, reducing the physical exertion of inspection personnel). Second, for convenient maintenance, if a line needs maintenance (such as replacing insulators) or if another line is being built after the first phase of the line has been completed, an insulating isolation net 2 can be installed on the auxiliary crossarm 12 to achieve live isolation, without the need for "power outage coordination" of the other line (the traditional solution requires both lines to be powered out simultaneously or temporary protection to be set up). Finally, fault location is more convenient. Because the two lines are on the same tower, when a fault occurs (such as insulator flashover), maintenance personnel can quickly locate the fault point, shortening the fault handling time (the traditional solution requires checking two towers separately, which is more time-consuming).

[0048] In summary, by setting up a series of crossarms 11, auxiliary crossarms 12, and drilling crossarms 13 arranged from top to bottom on the main body 10 of the tower head, the problem of crossing overhead transmission lines can be solved while taking into account practicality, economy, and power supply reliability.

[0049] In detail, the tower head body 10 serves as the installation and load-bearing foundation for each crossarm. It is assembled from angle steel, with some sections connected by steel plates, forming a spatial truss structure. The specific shape, dimensions, and other parameters of the tower head body 10 need to be selected and designed according to different application scenarios. This embodiment of the invention does not impose specific limitations. The specific structural form of the tower head body 10 can refer to the tower head structure of existing transmission towers, and will not be elaborated upon in this embodiment.

[0050] Furthermore, the traversing crossarm 11, the auxiliary wire mesh crossarm 12, and the drilling crossarm 13 are all configured as a full truss structure. As a three-dimensional structure, each crossarm has three directions. The direction along the tower head height is defined as its height direction, using the tower head cross-section as a reference. The direction extending along its long side is defined as its length direction, and the direction extending along its short side is defined as its thickness direction. It should be noted that, unless otherwise specified, the length, width, and height directions used in the following examples for describing each crossarm are based on this reference.

[0051] Understandably, depending on different construction requirements, the projections of the crossbeam 11 and the drilling crossbeam 13 onto the cross section of the tower head body 10 are arranged at a predetermined angle.

[0052] As a specific example of this utility model, the projections of the drilling crossarm 13 and the crossing crossarm 11 on the cross section of the tower head body 10 are arranged in a cross shape, that is, the length directions of the drilling crossarm 13 and the crossing crossarm 11 are perpendicular.

[0053] Furthermore, the crossing arm 11 includes three layers arranged from top to bottom: the crossing arm 111 for phase A, the crossing arm 112 for phase B, and the crossing arm 113 for phase C. The crossing arm 111 for phase A is used to hang the phase A line of the crossing conductor, the crossing arm 112 for phase B is used to hang the phase B line of the crossing conductor, and the crossing arm 113 for phase C is used to hang the phase C line of the crossing conductor.

[0054] It should be noted that the spatial distance between each pair of the crossarm 111 crossing phase A, the crossarm 112 crossing phase B, and the crossarm 113 crossing phase C is selected and designed according to the voltage level of the overhead line in the crossing area, so as to ensure that any two phase conductors do not discharge under all operating conditions. No specific restrictions are imposed in this embodiment of the utility model.

[0055] Furthermore, the drilling crossarm 13 includes three layers arranged from top to bottom: drilling A-phase crossarm 131, drilling B-phase crossarm 132, and drilling C-phase crossarm 133; wherein, drilling A-phase crossarm 131 is used to hang the A-phase line of the drilling conductor, drilling B-phase crossarm 132 is used to hang the B-phase line of the drilling conductor, and drilling C-phase crossarm 133 is used to hang the C-phase line of the drilling conductor.

[0056] It should be noted that the spatial distance between each pair of the crossarm 131 of phase A, the crossarm 132 of phase B, and the crossarm 133 of phase C is selected and designed according to the voltage level of the overhead line in the drilling area, so as to ensure that any two phase conductors do not discharge under all operating conditions. In this embodiment of the utility model, no specific restrictions are imposed.

[0057] The above-mentioned technical solutions can effectively improve operational safety and reduce the risk of failure. Specifically, in the traditional "aerial crossover" scheme, the three phase conductors of the overhead line are arranged side by side on the same crossarm, and the distance between two phase conductors is relatively close, which can easily lead to phase-to-phase short circuits, especially under high wind conditions and de-icing jumping conditions. The close proximity between different phase conductors of the crossing line can cause phase-to-phase short circuits in the transmission line. However, the tower head provided by this utility model embodiment has the three phase conductors arranged in layers, achieving physical isolation and strictly controlling the distance between the upper and lower layers or the left and right sides of the conductors. Even in extreme weather conditions, the conductors will not get close to each other, fundamentally solving the problem of phase-to-phase short circuits.

[0058] Furthermore, the number and location of the hanging points on each crossarm need to be selected and designed according to the load requirements (i.e., the number of circuits). For a single circuit, which includes only one set of three-phase wires, only one conductor of the corresponding phase needs to be hung on each crossarm (crossing crossarm 111 (crossing crossarm 111, crossing crossarm 112, and crossing crossarm 113), or crossing crossarm 13 (crossing crossarm 131, crossing crossarm 132, and crossing crossarm 133). In this case, the hanging point can be set at one end of the crossarm along its own length. For a double circuit, which includes two sets of three-phase wires, two wires need to be hung on each crossarm, and the hanging points can be set at both ends of the crossarm along its own length. And so on, and will not be listed one by one in this embodiment of the present invention.

[0059] In this embodiment, the crossarms 111 crossing phase A, 112 crossing phase B, and 113 crossing phase C each have hanging points at both ends along their length for hanging the conductors of the corresponding phases in the double-circuit crossing line. Similarly, the crossarms 131 drilling through phase A, 132 drilling through phase B, and 133 drilling through phase C each have hanging points at both ends along their length for hanging the conductors of the corresponding phases in the double-circuit drilling line.

[0060] To elaborate further: Two sets of hanging points are provided on the crossarm 111 spanning phase A. One set of hanging points is located at one end of the crossarm 111 spanning phase A, including at least two crossarm 114 spanning phase A I back hanging points 114 arranged at intervals along the thickness direction of the crossarm 111 spanning phase A. The other set of hanging points is located at the other end of the crossarm 111 spanning phase A, including at least two crossarm 2 back hanging points 115 arranged at intervals along the thickness direction of the crossarm 111 spanning phase A.

[0061] Two sets of hanging points are provided on the crossarm 112 spanning phase B. One set of hanging points is located at one end of the crossarm 112 spanning phase B, including at least two crossarm I return hanging points 116 arranged at intervals along the thickness direction of the crossarm 112 spanning phase B. The other set of hanging points is located at the other end of the crossarm 112 spanning phase B, including at least two crossarm II return hanging points 117 arranged at intervals along the thickness direction of the crossarm 112 spanning phase B.

[0062] Two sets of hanging points are provided on the crossarm 113 spanning phase C. One set of hanging points is located at one end of the crossarm 113 spanning phase C, including at least two crossarm I back hanging points 118 arranged at intervals along the thickness direction of the crossarm 113 spanning phase C. The other set of hanging points is located at the other end of the crossarm 113 spanning phase C, including at least two crossarm II back hanging points 119 arranged at intervals along the thickness direction of the crossarm 113 spanning phase C.

[0063] Two sets of hanging points are provided on the crossarm 131 of the A-phase drilling crossing. One set of hanging points is located at one end of the crossarm 131 of the A-phase drilling crossing, including at least two A-phase I return hanging points 134 arranged at intervals along the thickness direction of the crossarm 131 of the A-phase drilling crossing. The other set of hanging points is located at the other end of the crossarm 131 of the A-phase drilling crossing, including at least two A-phase II return hanging points 135 arranged at intervals along the thickness direction of the crossarm 131 of the A-phase drilling crossing.

[0064] Two sets of hanging points are provided on the crossarm 132 of the B phase drilling. One set of hanging points is located at one end of the crossarm 132 of the B phase drilling, including at least two B phase I back hanging points 136 arranged at intervals along the thickness direction of the crossarm 132 of the B phase drilling. The other set of hanging points is located at the other end of the crossarm 132 of the B phase drilling, including at least two B phase II back hanging points 137 arranged at intervals along the thickness direction of the crossarm 132 of the B phase drilling.

[0065] Two sets of hanging points are provided on the C-phase crossarm 133. One set of hanging points is located at one end of the C-phase crossarm 133, including at least two C-phase I back-hanging points 138 arranged at intervals along the thickness direction of the C-phase crossarm 133. The other set of hanging points is located at the other end of the C-phase crossarm 133, including at least two C-phase II back-hanging points 139 arranged at intervals along the thickness direction of the C-phase crossarm 133.

[0066] The auxiliary crossarm 12 for netting is provided with two sets of hanging points. One set of hanging points is located at one end of the auxiliary crossarm 12 and includes at least two first isolation net hanging points 121 arranged at intervals along the thickness direction of the auxiliary crossarm 12. The other set of hanging points is located at the other end of the auxiliary crossarm 12 and includes at least two second isolation net hanging points 122 arranged at intervals along the thickness direction of the auxiliary crossarm 12.

[0067] Of course, the above is only an example, and other numbers or arrangements of hanging points will not be listed one by one in this embodiment of the utility model.

[0068] In one example of this invention, the auxiliary crossarm 12 for hanging the mesh is aligned with the length direction of the crossing crossarm 11. With this configuration, due to the high voltage of the crossing line, aligning the length direction of the auxiliary crossarm 12 with the crossing crossarm 11 ensures that the insulating mesh 2 accurately covers the crossing line area, guaranteeing construction or operational safety.

[0069] Furthermore, the spacing between the hanging points at both ends of the auxiliary crossarm 12 is greater than or equal to the maximum spacing between the hanging points at both ends of the crossing crossarm 11. This arrangement ensures that the insulating net 2 completely covers the crossing line, further guaranteeing construction or operational safety.

[0070] Understandably, the position of the auxiliary crossarm 12 on the tower head needs to take into account the voltage levels of the overhead crossing line and the drilling line below, as well as the construction operation space, to ensure that the live parts do not discharge to the construction personnel.

[0071] In a specific application scenario, when a later-stage power line construction crosses an existing first-stage power line, and the lower-stage crossing line is the current-stage line under construction, the upper crossing line is energized. First, a protective netting installation is carried out. An insulating isolation netting 2 is hung on the auxiliary crossarm 12 to prevent workers' heads and hands from accidentally approaching the energized conductor during the current-stage line construction, ensuring that the current-stage crossing line construction work remains within a safe zone.

[0072] If the lower drilling line is an existing Phase I line and the upper crossing line is a Phase I line under construction, the lower drilling line is energized. First, a protective netting installation is carried out. An insulating isolation net 2 is hung on the auxiliary crossarm 12 to prevent workers' legs from accidentally approaching the energized conductors below during the current line-building work. It also prevents the conductors, ground wires, and construction tools above from falling, ensuring that the current drilling line construction work remains within a safe zone.

[0073] Once the line construction in this area is completed, the insulation netting 2 will be removed, and construction of other tower sites can then proceed.

[0074] It is understood that the specific structural form of the insulating mesh 2 can be selected and designed according to actual needs, and no specific restrictions are imposed in this embodiment of the utility model.

[0075] In a further example of this utility model, the tower head body 10 is also provided with a ground wire crossarm area 104 located above the crossing crossarm area 101. The ground wire crossarm area 104 is connected to a first ground wire crossarm 14 and a second ground wire crossarm 15. The first ground wire crossarm 14 is aligned with the length direction of the crossing crossarm 11 and is used to protect the crossing line from lightning. The second ground wire crossarm 15 is aligned with the length direction of the drilling crossarm 13 and is used to protect the drilling line from lightning.

[0076] This configuration, with two layers of ground wires, can provide lightning protection for both the crossing line and the drilling line. Compared to the traditional single ground wire crossarm with lightning protection wire on the iron tower, it can greatly improve the lightning protection range, especially by significantly reducing the lightning protection angle of the lower drilling line, making the probability of lightning striking the conductor extremely low and significantly reducing the overhead line lightning tripping rate.

[0077] In detail, the first grounding crossarm 14 is provided with two sets of hanging points. One set of hanging points is set at one end of the first grounding crossarm 14, including at least two first grounding hanging points A141 arranged at intervals along the thickness direction of the first grounding crossarm 14. The other set of hanging points is set at the other end of the first grounding crossarm 14, including at least two first grounding hanging points B142 arranged at intervals along the thickness direction of the first grounding crossarm 14.

[0078] In detail, the second grounding crossarm 15 is provided with two sets of hanging points. One set of hanging points is set at one end of the second grounding crossarm 15, including at least two second grounding hanging points A151 arranged at intervals along the thickness direction of the second grounding crossarm 15. The other set of hanging points is set at the other end of the second grounding crossarm 15, including at least two second grounding hanging points B152 arranged at intervals along the thickness direction of the second grounding crossarm 15.

[0079] In detail, the first grounding crossarm 14 is located above the second grounding crossarm 15.

[0080] The transmission tower provided by this utility model is described below. The transmission tower described below and the tower head of the crossing transmission tower described above can be referred to in correspondence.

[0081] Reference Figures 1 to 4 A transmission tower includes, from bottom to top, tower legs 3, tower body 4, and tower head 1 that crosses over the transmission tower as provided in any of the above examples.

[0082] In detail, tower leg 3 is the part that connects the tower to the ground foundation. It is the "foundation" of the entire tower and is mainly used to safely transfer all the loads (vertical, horizontal, and uplift forces) transmitted by the tower body 4 to the ground, while resisting the tower from overturning and sliding, ensuring overall stability. Tower foot plates are installed at the bottom of tower leg 3, and the tower and foundation are connected together by anchor bolts.

[0083] The tower body 4 serves as the hub connecting the tower head and the tower leg 3, playing a crucial role in transferring all the loads (vertical, horizontal, and longitudinal) borne by the tower head to the tower leg 3 evenly, while maintaining the overall stability of the tower.

[0084] It should be noted that the specific structure of the tower leg 3 and the tower body 4 can be referred to as that of a conventional power transmission tower, and will not be described again in this embodiment of the utility model.

[0085] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0086] The cross-crossing transmission tower and transmission tower provided in this embodiment of the utility model, by setting a crossing crossarm 11, a grid-connecting auxiliary crossarm 12 and a drilling crossarm 13 arranged in layers from top to bottom on the main body 10 of the tower head, can solve the problem of cross-crossing of overhead transmission lines while taking into account practicality, economy and power supply reliability.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tower head that crosses a transmission tower, characterized in that, Includes: the main body of the tower head (10); The tower head body (10) is provided with layers arranged sequentially from top to bottom: The ground wire crossarm area (104) is connected to the first ground wire crossarm (14) and the second ground wire crossarm (15); A crossing crossarm area (101) is connected to a crossing crossarm (11) for hanging crossing conductors; The auxiliary crossarm area (102) is connected to the auxiliary crossarm (12) for hanging the insulating net (2); The drilling crossarm area (103) is connected to the drilling crossarm (13) for hanging the drilling guide wire; The drilling crossarm (13) and the crossing crossarm (11) are arranged intersectingly on the cross section of the tower head body (10). The first ground wire crossarm (14) is in the same length direction as the crossing crossarm (11), and the second ground wire crossarm (15) is in the same length direction as the drilling crossarm (13). The wire mesh auxiliary crossarm (12) is in the same length direction as the crossing crossarm (11) or the drilling crossarm (13).

2. The tower head of the crossing transmission tower according to claim 1, characterized in that, The crossing crossarm (11) includes the following layers arranged from top to bottom: the crossing crossarm (111) for phase A, the crossing crossarm (112) for phase B, and the crossing crossarm (113) for phase C.

3. The tower head of the crossing transmission tower according to claim 2, characterized in that, The crossarms crossing phase A (111), phase B (112), and phase C (113) are all equipped with hanging points at both ends along their length for hanging conductors of different circuits.

4. The tower head of the crossing transmission tower according to claim 1, characterized in that, The drilling crossarm (13) includes the following layers arranged from top to bottom: drilling crossarm A phase (131), drilling crossarm B phase (132), and drilling crossarm C phase (133).

5. The tower head of the crossing transmission tower according to claim 4, characterized in that, The drilling crossarm A (131), drilling crossarm B (132), and drilling crossarm C (133) are all provided with hanging points at both ends of their length direction for hanging conductors of different circuits.

6. The tower head of the crossing transmission tower according to any one of claims 1 to 5, characterized in that, The length direction of the auxiliary crossarm (12) for hanging netting is consistent with that of the crossing crossarm (11).

7. The tower head of the crossing transmission tower according to claim 6, characterized in that, The distance between the hanging points at both ends of the auxiliary crossarm (12) is greater than or equal to the maximum distance between the hanging points at both ends of the crossarm (11).

8. The tower head of the crossing transmission tower according to claim 1, characterized in that, The length directions of the crossing crossarm (11) and the drilling crossarm (13) are perpendicular to each other.

9. The tower head of the crossing transmission tower according to claim 8, characterized in that, The first grounding crossarm (14) is located above the second grounding crossarm (15).

10. A transmission tower, characterized in that, It includes tower legs (3), tower body (4) connected sequentially from bottom to top, and tower head (1) that crosses the transmission tower as described in any one of claims 1 to 9.

Images