Lightning protection reinforced transmission line landscape tower

Abstract

This invention relates to the field of power transmission tower technology, and provides a lightning-protected reinforced power transmission line landscape tower, including a tower body and a tower head, with a bottle-mouth transverse diaphragm between them. The tower head is connected to the bottle-mouth transverse diaphragm. The tower head includes a ground wire support, a conductor crossarm, an upper curved arm, and a lower curved arm. The lower curved arm is supported by the tower body, the upper curved arm is supported by the lower curved arm, the conductor crossarm is supported by the upper curved arm, and the ground wire support is supported at the end of the conductor crossarm. The lateral dimension of the ground wire support is larger than the lateral dimension of the side phase conductor suspension point, which is used to provide negative protection angle protection for the conductor. The upper and lower curved arms are connected by K-type nodes, and the connection point is a curved arm K-type node. The outer main material of the curved arm K-type node is concave to the inner side of the tower body. A horizontal member is provided on the inner side of the lower curved arm, and the horizontal member connects the two lower curved arms. The inner and outer main materials of the lower curved arm are connected to the bottle-mouth transverse diaphragm by K-type nodes. The beneficial effects of this invention are: it is suitable for high lightning areas; it reduces the deformation of the K-type nodes; and the bottle-mouth slope node has uniform stress on the front and side surfaces.

Description

Technical Field

[0001] This invention relates to the field of power transmission tower technology, and more specifically, to a lightning-protected and enhanced landscape tower for power transmission lines. Background Technology

[0002] Currently, the main types of single-circuit suspension towers used for transmission lines in China are cat-head towers and goblet towers. Although these tower types offer relatively economical tower specifications, they have the following drawbacks:

[0003] 1. With economic development and increasing electricity demand, the construction of power transmission lines is increasing. Due to corridor limitations, some lines need to run near environmentally sensitive areas such as urban peripheries, grasslands, and scenic spots. According to relevant development strategies, power transmission line construction should pursue an organic combination of nature and aesthetics, realizing corresponding cultural concepts. Traditional cat-head towers and goblet-shaped towers have relatively simple forms, with their exterior design mainly based on factors such as stress, transportation, and assembly, with less consideration for aesthetic factors.

[0004] 2. Traditional cat-head towers, wine glass towers, and existing sheep-head and bull-head landscape towers, based on considerations of the middle phase conductor gap and structural requirements, design the curved arm as either convex or straight, with the main materials inside the lower curved arm connected using X-type nodes. In recent years, multiple projects have reported that the K-type nodes of the curved arm are prone to outward bulging deformation. Significant outward bulging deformation leads to a redistribution of internal forces within the tower, reducing the safety of the K-type node. Furthermore, during tower assembly, guy wires need to be installed at the K-node to control deformation, increasing construction risks.

[0005] 3. In high-altitude areas, due to geological and transportation factors, the risks and costs of foundation construction are relatively high. Traditional landscape tower designs focus on optimizing tower weight indicators while neglecting the optimization of foundation forces and indicators. This results in a significant increase in the investment in the main structure of the landscape tower, which is not conducive to the promotion and application of landscape towers.

[0006] 4. The existing bull-head and sheep-head landscape towers adopt a positive protection angle design, which is difficult to apply in high-lightning-risk areas with high lightning protection requirements. Summary of the Invention

[0007] The present invention aims to provide a lightning-protected and reinforced landscape tower for transmission lines, in order to solve the problems of insufficient aesthetic considerations in existing wine glass towers and cat head towers, the difficulty of adapting existing landscape towers to high lightning zones and poor economic efficiency, as well as the problem of large deformation of existing tower types with curved arm K-type nodes.

[0008] This invention is achieved using the following technical solution:

[0009] This invention provides a lightning protection enhanced transmission line landscape tower, including a tower body and a tower head, with a bottle neck transverse diaphragm between the tower body and the tower head, and the tower head connected to the bottle neck transverse diaphragm.

[0010] The tower head includes a ground wire support, a conductor crossarm, an upper curved arm, and a lower curved arm. The lower curved arm is supported on the tower body, the upper curved arm is supported on the lower curved arm, the conductor crossarm is supported on the upper curved arm, and the ground wire support is supported on the end of the conductor crossarm.

[0011] The lateral dimension of the grounding bracket is larger than the lateral dimension of the phase conductor hanging point, which is used to provide negative protection angle protection for the conductor;

[0012] The upper and lower curved arms are connected by K-type nodes. The connection point is a curved arm K-type node, and the outer main material of the curved arm K-type node is recessed into the inner side of the tower body.

[0013] A horizontal member is provided on the inner side of the lower curved arm, and the horizontal member connects the lower curved arms on both sides;

[0014] The inner and outer main materials of the lower curved arm are connected to the transverse diaphragm of the bottle mouth using K-type nodes.

[0015] The lightning protection enhanced transmission line landscape tower described in this invention can reduce the deformation problem of the curved arm K node of existing wine glass towers and bull head and sheep head landscape towers, reduce the uneven force transmission problem on the front and side of the bottle mouth slope node, and improve the lightning protection performance and safety and economy of existing transmission line landscape towers.

[0016] This invention, while adopting a yak landscape design, features a negative protection angle design for the ground wire, making it suitable for high-mine-rate areas compared to existing landscape towers. The curved arm K-shaped node uses a concave design and adds a horizontal member to the lower curved arm for connection, which can significantly reduce the deformation of the wine glass tower K-shaped node, resulting in good force transmission and construction safety. The bottle mouth slope node has a more uniform force distribution on the front and side sides, ensuring good safety.

[0017] As a preferred technical solution:

[0018] The horizontal members are positioned at 1 / 2 to 1 / 4 of the height of the lower curved arm.

[0019] As a preferred technical solution:

[0020] A node A is provided on the lower curved arm, and the horizontal member is connected to the main member inside the lower curved arm through node A.

[0021] As a preferred technical solution:

[0022] A node B is provided on the transverse diaphragm of the bottle neck. Node B is located on the horizontal material inside the transverse diaphragm of the bottle neck. The main material inside the lower curved arm is connected to the transverse diaphragm of the bottle neck through node B.

[0023] As a preferred technical solution:

[0024] The slope of the tower is between 0.15 and 0.20.

[0025] As a preferred technical solution:

[0026] The ground wire is suspended at the top of the ground wire bracket.

[0027] As a preferred technical solution:

[0028] The side phase conductors are in I-string configuration and are suspended on the longitudinal horizontal members at the end of the conductor crossarm.

[0029] As a preferred technical solution:

[0030] The middle phase conductor is a V-string, suspended at the top or upper part of the inner side of the upper curved arm.

[0031] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0032] The lightning-protected reinforced transmission line landscape tower of this invention incorporates the characteristics of Tibetan yaks in its tower design, making it aesthetically pleasing. The grounding wire support features a negative protection angle design, making it suitable for high-lightning-prone areas. The K-shaped nodes on the tower head are recessed inwards towards the tower body, and horizontal members are installed between the lower curved arms, effectively reducing the outward bulging deformation of the K-shaped nodes, resulting in more reliable force transmission. During construction, it eliminates the need for guy wires at the K-shaped nodes, improving construction safety. Because the main members of the lower curved arms are connected in the middle of the transverse diaphragm via K-shaped nodes, the bottle-mouth slope joint is no longer connected to the main members of the lower curved arms, ensuring uniform stress distribution on the front and side bottle-mouth slope joints, further enhancing safety. While the wide-mouth design increases the tower weight by approximately 10%-15%, it reduces the foundation force by approximately 30%-40%, saving approximately 20%-30% of foundation engineering work, reducing foundation depth and construction safety risks, resulting in significant economic and social benefits. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the lightning protection enhanced transmission line landscape tower described in this invention.

[0034] Figure 2 This is a front view of the lightning protection enhanced transmission line landscape tower described in this invention.

[0035] Figure 3 for Figure 2 A schematic diagram of node A in the middle.

[0036] Figure 4 for Figure 2 A schematic diagram of node B in the middle.

[0037] Figure 5 for Figure 2 A schematic diagram of node C in the middle.

[0038] Icons: 1-Tower body, 2-Tower head, 3-Ground wire bracket, 4-Conductor crossarm, 5-Upper curved arm, 6-Lower curved arm, 7-Curved arm K-type node, 8-Horizontal member, 9-Bottle neck K-type node, 10-Bottle neck transverse diaphragm, 31-Ground wire bracket hanging point, 41-Side phase conductor hanging point, 51-Middle phase conductor hanging point, 61-Lower curved arm inner main member. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown in the figure, this embodiment proposes a lightning protection enhanced transmission line landscape tower, including a tower body 1 and a tower head 2. The tower head 2 is installed above the tower body 1, and a bottle neck transverse partition 10 is provided between the tower body 1 and the tower head 2. The tower head 2 is connected to the bottle neck transverse partition 10.

[0042] The tower head 2 includes a ground wire support 3, a conductor crossarm 4, an upper curved arm 5, and a lower curved arm 6. The two lower curved arms 6 are symmetrically supported on the tower body 1, the two upper curved arms 5 are each supported on one lower curved arm 6, the conductor crossarm 4 is supported on the two upper curved arms 5, and the two ground wire supports 3 are each supported on both ends of the conductor crossarm 4.

[0043] In this embodiment, the tower head 2 adopts a yak shape with conductor IVI arrangement; the lateral dimension of the ground wire bracket 3 is larger than the lateral dimension of the side phase conductor hanging point 41 (for 500kV light and medium icing areas, the lateral single-side dimension of the ground wire bracket 3 is 1.75m and 2m larger than 41 respectively), providing negative protection angle for the conductor; the upper curved arm 5 and the lower curved arm 6 are connected by a K-type node, which is the curved arm K-type node 7 here; the outer main material of the curved arm K-type node 7 is recessed into the inner side of the tower body 1; a horizontal member 8 connects the two lower curved arms 6; the inner and outer main materials of the lower curved arm 6 are connected to the bottle mouth transverse partition 10 by a K-type node, which is the bottle mouth K-type node 9 here.

[0044] To facilitate wire hanging and meet the requirements for gap, protection angle, and horizontal distance between the ground wire and the ground wire, preferably, the ground wire is suspended from the top of the ground wire bracket 3. Figure 2 Number 31 is the grounding bracket hanging point; the side phase conductor is suspended in series I on the longitudinal horizontal member at the end of conductor crossarm 4. Figure 2 Point 41 is the suspension point for the side phase conductor; the middle phase conductor is suspended in a V-string at the top or upper part of the inner side of the upper curved arm 5. Figure 2 The number 51 is the suspension point for the middle phase conductor.

[0045] To more effectively limit the deformation of the K-type node 7 of the curved arm, preferably, in addition to arranging the outer main member of the K-type node 7 concave towards the inner side of the tower body 1, a horizontal member 8 is installed at 1 / 2 to 1 / 4 of the height of the lower curved arm 6, provided that the gap at the lower end of the middle phase conductor is satisfied. The height of the horizontal member 8 should not be too low to avoid insufficient deformation control capacity; nor should it be too high to avoid insufficient distance from the middle phase conductor. The horizontal member 8 can replace the function of temporary cables on the one hand, and on the other hand, it helps to improve the structural stiffness of the lower curved arm 6. Calculations show that, under the same conditions, taking a 31 m / s wind and 15 mm ice of a Type 2 straight tower as an example, the horizontal relative deformation value of the K-type node of the curved arm is calculated as follows: 38.3 mm for the wine glass tower under a 60° strong wind, and 0 mm for this tower type; 39.3 mm for the wine glass tower under double hoisting conditions, and 4.7 mm for this tower type.

[0046] like Figure 3 As shown, a node A is provided on the lower curved arm 6, and the horizontal member 8 is connected to the inner main member 61 of the lower curved arm through node A.

[0047] To better showcase the head features of the yak, such as Figure 4 and Figure 5 As shown, a node B is provided on the transverse diaphragm 10 of the bottle mouth, which connects the inner main material 61 of the lower curved arm to the horizontal material on the inner side of the transverse diaphragm 10 of the bottle mouth according to the K-type node structure. This avoids the direct connection between the inner main material 61 of the lower curved arm and the bottle mouth node C, reduces the front force on the bottle mouth node C, and ensures that the force on the bottle mouth slope node on the front and side is uniform, resulting in better safety.

[0048] To match the bull's head shape, Tower Head 2 adopts a wide opening and a steep slope design. Preferably, the tower slope is 0.15-0.20, which also significantly reduces the foundation load. Taking a 31m / s wind and 15mm ice thickness type 2 straight-line tower as an example, the weight of a 48m high "wine glass" tower is approximately 41.32t, while this tower type weighs approximately 47.57t. The pull-out force on the foundation of the "wine glass" tower is 1630kN, while the pull-out force on this tower type is 1087kN, resulting in a significant reduction in foundation work. In high-altitude areas, foundation construction costs account for a larger proportion of the overall cost. Although the tower weight increases slightly, the overall cost can be reduced by approximately 6%-10%. The reduced foundation depth also helps lower construction risks.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lightning-protected and reinforced transmission line landscape tower, comprising a tower body (1) and a tower head (2), characterized in that: A bottle mouth diaphragm (10) is provided between the tower body (1) and the tower head (2), and the tower head (2) is connected to the bottle mouth diaphragm (10); The tower head (2) includes a ground wire bracket (3), a conductor crossarm (4), an upper curved arm (5) and a lower curved arm (6). The lower curved arm (6) is supported on the tower body (1), the upper curved arm (5) is supported on the lower curved arm (6), the conductor crossarm (4) is supported on the upper curved arm (5), and the ground wire bracket (3) is supported on the end of the conductor crossarm (4). The lateral dimension of the ground wire bracket (3) is larger than the lateral dimension of the side phase conductor hanging point, which is used to provide negative protection angle protection for the conductor; The upper curved arm (5) and the lower curved arm (6) are connected by K-type nodes. The connection point is the curved arm K-type node (7). The outer main material of the curved arm K-type node (7) is recessed into the inner side of the tower body. A horizontal member (8) is provided on the inner side of the lower curved arm (6), and the horizontal member (8) connects the lower curved arms (6) on both sides; The inner and outer main materials of the lower curved arm (6) are connected to the bottle mouth transverse diaphragm (10) using K-type nodes.

2. The lightning protection reinforced transmission line landscape tower according to claim 1, characterized in that: The horizontal member (8) is positioned at 1 / 2 to 1 / 4 of the height of the lower curved arm (6).

3. The lightning protection reinforced transmission line landscape tower according to claim 1, characterized in that: A node A is provided on the lower curved arm (6), and the horizontal member (8) is connected to the main member (61) inside the lower curved arm through node A.

4. The lightning protection reinforced transmission line landscape tower according to claim 1, characterized in that: A node B is provided on the bottle neck transverse diaphragm (10). The node B is located on the horizontal material inside the bottle neck transverse diaphragm (10). The inner main material (61) of the lower curved arm is connected to the bottle neck transverse diaphragm (10) through the node B.

5. The lightning protection reinforced transmission line landscape tower according to claim 1, characterized in that: The slope of the tower body (1) is between 0.15 and 0.

20.

6. The lightning protection reinforced transmission line landscape tower according to any one of claims 1-5, characterized in that: The ground wire is suspended at the top of the ground wire bracket (3).

7. The lightning protection reinforced transmission line landscape tower according to claim 6, characterized in that: The side phase conductors are in I-string and suspended on the longitudinal horizontal material at the end of the conductor crossarm (4).

8. The lightning protection reinforced transmission line landscape tower according to claim 7, characterized in that: The middle phase conductor is a V-string, suspended on the top or upper part of the inner side of the upper curved arm (5).

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