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

Abstract

The utility model relates to the field of power transmission line engineering, in particular to a super-large-range direct-current power transmission tower for steep mountainous areas. 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 regions with large height difference.

Description

Technical Field

[0001] The utility model relates to the field of transmission line engineering, and particularly relates to a DC transmission tower for extremely large level differences in steep mountainous areas. Background Technique

[0002] When conducting overhead transmission line engineering, especially for long-distance power transmission by DC transmission, it is often necessary to cross various types of terrain and geological sections. Affected by the special geographical environment, when the overhead transmission line crosses the section of mountains and ridges, it often faces the situations of steep terrain, large tower position slope, and large tower leg level difference.

[0003] In the conventional UHV DC transmission line, the transmission tower generally adopts the "dry" type layout, and the jumper is arranged in the form of a "V" string below the conductor cross-arm. For the tower position in the steep mountainous area, the pole conductor on the side close to the mountain body may require an increase in the tower's calling height due to insufficient ground clearance of the jumper gap. In addition, the tension tower mainly bears the longitudinal load, and its tower body slope is generally large. When the tower height increases, the root opening of its connecting legs will also increase accordingly, which will further increase the level difference height between different tower legs. In order to meet the requirements of the terrain slope in the steep mountainous area, it is often necessary to raise the foundation or carry out large-scale excavation measures on the base surface, which not only increases the difficulty of foundation construction but also exacerbates the degree of environmental damage. Therefore, it is necessary to carry out special treatment on the existing conventional transmission tower structure type to meet the structural requirements of the large-level-difference transmission tower in the steep mountainous area. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problems in the prior art and provide a DC transmission tower for extremely large level differences in steep mountainous areas, which can be applied to the DC transmission line project in areas with large height differences.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a DC transmission tower for extremely large level differences in steep mountainous areas, which includes tower legs, tower leg extension sections, tower bodies, and tower heads connected in sequence from bottom to top; a ground wire cross-arm is horizontally arranged at the top of the tower head; ground wire hanging points are arranged on the ground wire cross-arm; the ground wire hanging points are connected to the ground wire; jumper supports are arranged at both ends of the ground wire cross-arm; jumper hanging points are symmetrically arranged on the outer sides of the jumper supports; conductor cross-arms are symmetrically arranged along the central axis on the tower body; conductor hanging points are symmetrically arranged on the outer sides of the ends of the conductor cross-arms; the conductor hanging points are connected to the conductors; the transmission tower further 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.

[0007] Preferably, the tower legs are of varying heights; the longest tower leg is connected to the tower body by a tower leg extension section.

[0008] Preferably, the slope of the extended section of the tower leg is the same as the slope of the tower leg.

[0009] Preferably, the tower leg extension is connected to the tower body and the longest tower leg by means of internal angle steel and external plate bolts.

[0010] Preferably, the tower leg extension section is constructed using diagonal bracing arranged in a cross bracing configuration.

[0011] Preferably, the jumper wire is of the "L" string type, and the wire is connected to the jumper wire in an upward winding manner.

[0012] Preferably, the jumper bracket and the ground wire crossarm are perpendicular.

[0013] Preferably, the jumper bracket is triangular pyramidal in shape.

[0014] Preferably, the bottle neck of the tower body adopts a single slope change form; the slope change point of the bottle neck is located below the conductor crossarm.

[0015] Preferably, the tower legs are connected to the ground foundation via anchor bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention increases the height of the jumper by placing the jumper bracket at the ground wire crossarm, thus avoiding insufficient ground clearance caused by the jumper string being too close to the side near the steep mountain, which would force the tower height to be increased. This reduces the height of the conductor suspension point on the tower and reduces the weight of the transmission tower.

[0018] Furthermore, by adding tower leg extensions at the tower legs, the range of height difference between the tower legs is increased, avoiding the problem of excessively small angles between the main material and diagonal material of long tower legs and flat diagonal material of short tower legs. At the same time, by increasing the height difference between tower legs, excessive squareness of the base surface of short legs is avoided, reducing the damage to the ecological environment, preventing high outcrops of the foundation of long legs, facilitating high formwork construction for foundations in steep mountainous areas, and reducing construction risks. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a front view of a transmission tower for a large-stage DC transmission line.

[0021] Figure 2 A schematic diagram of the conductor jumper arrangement for a transmission tower of a large-scale DC transmission line;

[0022] Figure 3 A schematic diagram illustrating the difference in tower leg height before and after adding a tower leg extension section to the transmission tower;

[0023] Figure 4 This is a schematic diagram of the tower leg extension structure;

[0024] Figure 5 for Figure 4 Schematic diagram of the AA section;

[0025] Figure 6 for Figure 4 Schematic diagram of the BB cross section;

[0026] Figure 7 Schematic diagram of adding horizontal partitions to the tower legs;

[0027] Figure 8 for Figure 7 Schematic diagram of the CC section.

[0028] The components are: 1. Ground wire crossarm; 2. Jumper bracket; 3. Conductor crossarm; 4. Tower head; 5. Tower body; 6. Tower leg extension; 7. Tower leg; 8. Conductor jumper. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, terms such as "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] This utility model provides a DC transmission tower for use in steep mountainous areas with extremely large voltage differences, such as... Figure 1 and Figure 2 As shown, the ultra-large differential DC transmission tower of this utility model includes, from bottom to top, tower legs 7, tower leg extensions 6, tower body 5, and tower head 4 connected in sequence; a ground wire crossarm 1 is horizontally arranged on the top of the tower head 4; a ground wire hanging point is provided on the ground wire crossarm 1; the ground wire hanging point is connected to the ground wire; jumper brackets 2 are provided at both ends of the ground wire crossarm 1; jumper hanging points are symmetrically arranged on the outer side of the jumper brackets 2; conductor crossarms 3 are symmetrically arranged along the central axis on the tower body 5; conductor hanging points are symmetrically arranged on the outer side of the ends of the conductor crossarms 3; the conductor hanging points are connected to the conductors; the transmission tower also includes conductor jumpers 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 crossarm 1; the conductors are connected to the conductor jumpers 8.

[0037] This invention utilizes tower legs 7 to enable the transmission tower to withstand greater vertical and horizontal loads, providing stable foundation support. The tower body 5 allows for better load distribution, preventing uneven settlement and structural deformation. The symmetrically arranged conductor crossarms 3 along the central axis effectively support the superstructure, enhancing the tower's strength and stability, especially under external factors such as wind or earthquakes, ensuring its safety. Furthermore, the conductor crossarms 3 are arranged without tapering, with pre-reserved conductor hanging points and construction holes at the ends according to the conductor hanging point dimensions. The conductor hanging points on the outer side of the conductor crossarm 3 connect to the conductor, which is horizontally positioned. The conductor protection angle meets regulatory requirements, ensuring reliable transmission. A ground wire crossarm 1 is installed at the top of the tower head 4, with ground wire hanging points for direct ground wire connection. The horizontally positioned ground wire prevents damage to electrical equipment caused by lightning strikes. This utility model places the jumper bracket 2 at the end of the ground wire crossarm 1, which increases the height of the jumper and avoids the jumper string being too close to the side near the steep mountain, resulting in insufficient distance to the ground and forcing the tower height to be increased. It also reduces the height of the conductor suspension point of the tower and reduces the weight of the tower.

[0038] In addition, the tower leg 7 includes all-around high and low legs; the difference between the all-around high and low legs is considered to be 1m. Through the 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, and ensure the stability of the entire tower body.

[0039] For example, such as Figures 3-6 As shown, a tower leg extension section 6 is provided 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, with a height considered to be 7.5m~10.5m. No separate joint is set inside the tower leg extension section 6, while ensuring that the included angle between the main member and the diagonal member of the longest tower leg 7 is not less than 19°. At the same time, the tower leg extension section 6 can be designed with different extension lengths to adapt to the terrain slope of the actual tower location. The main member and diagonal member of the extension section are connected by cross members, and auxiliary members are used to reduce the calculated slenderness ratio of the main member. The V-face of the extension section also adopts the cross member arrangement, and the front and side diagonal members are connected by connecting plates. The connecting plates are bent according to the included angle of the V-face.

[0040] like Figure 7 and Figure 8As shown, after adding the tower leg extension section 6 to the long leg side of this utility model, when the joint length of the tower leg 7 exceeds 3 segments, a horizontal partition can be set at the lower end of the extension section using a re-divided structure to increase the torsional resistance of the extension section. The tower leg extension section 6 is connected to the tower body 5, the longest tower leg 7, the diagonal members of the tower leg 7, and the horizontal partition members through internal angle steel and external plate bolts. This not only reduces the number of welds but also effectively improves the tensile and shear strength of the connection parts, ensuring a tight connection between the various parts of the structure and preventing loosening or damage at the connection parts under large loads, further enhancing the overall stability of the tower body.

[0041] For example, the ground wire crossarm 1 and jumper bracket 2 are cambered as a whole, with the pre-camber value rounded up to 1 / 100 of the cantilever length. This overall cambering method can preemptively offset the sagging effect caused by loads (such as self-weight, construction and installation, temperature changes, etc.), ensuring a more reasonable and uniform shape for the ground wire crossarm 1 and jumper bracket 2 during actual operation. The pre-camber value ensures good stress distribution in the structure under load, preventing equipment damage or line faults caused by excessive ground wire sagging or uneven stress.

[0042] This invention increases the range of height differences between the tower legs by adding a tower leg extension section 6 to the long leg section. This meets the requirements of large height differences in the tower legs 7 in steep mountainous areas, avoids the problem of excessively small angles between the main material and diagonal material of the long leg and the flatness of the diagonal material of the short leg, and optimizes the stress pattern of the tower leg 7 structure. At the same time, in areas with large elevation differences such as steep mountainous areas, the length of the tower legs 7 varies greatly. The design of the tower leg extension section 6 can provide a more flexible structural adjustment method without increasing the construction difficulty too much. Specifically, by increasing the height difference between the tower legs 7, it avoids excessive squareness of the base surface of the short legs, reducing the damage to the ecological environment. Secondly, it can also avoid high exposed ends of the long leg foundation, reducing the difficulty of foundation construction for the construction unit. It is suitable for DC transmission line projects in areas with large elevation differences.

[0043] For example, the slope of the extended section 6 of the tower leg is the same as that of the longest tower leg 7 to match tower legs 7 of different lengths, ensuring the consistency of the overall geometry and stress distribution of the entire transmission tower. This can effectively distribute vertical and horizontal loads, making the tower more stable under various environmental conditions, especially in steep mountainous areas, where it can better adapt to complex terrain conditions. In addition, the consistent stress state of the tower legs 7 helps to reduce structural deformation caused by uneven stress and improves the load-bearing capacity of the tower.

[0044] This utility model features a "T"-shaped structure where the jumper bracket 2 is placed on the upper part of the conductor crossarm 3. The conductor is connected to the conductor hanging point of the lower conductor crossarm 3 using double-connected hardware. The jumper 8 is a cage-type rigid jumper wire winding method, with three sections winding and connecting the front and rear conductors. Jumper spacers are installed from the outlet of the tension string to the end of the squirrel cage frame of the jumper 8. The installation position of the spacers is determined according to the actual situation to ensure that the jumper is formed smoothly and beautifully, and to prevent twisting or rigid deformation. After the jumper is installed, the gap requirements should be met.

[0045] The jumper wire 8 of this utility model is of the "L" string type, with double jumpers arranged symmetrically front and back. Each pole conductor is considered to use double "L" strings. In order to avoid controlling the distance to the ground by the jumper wire gap of the transmission tower, the conductor is connected to the "L" string jumper wire 8 by winding upwards. By raising the height of the jumper wire, the distance to the ground of the jumper wire close to the steep mountain side is not insufficient, thereby reducing the height of the conductor hanging point of the tower.

[0046] For example, the jumper bracket 2 is a triangular pyramid shape and is set perpendicular to the ground wire crossarm 1, which can effectively optimize the structural form of the bracket and improve the overall stability. The triangular pyramid bracket design has strong mechanical stability, can withstand large loads, and ensures long-term reliability. At the same time, the outward cantilever length of the bracket is reasonably adjusted according to the length of the V-string, effectively reducing the outward flare angle of the V-string connection plate, thereby reducing stress concentration at the connection point and avoiding structural instability or damage due to excessive angle. In addition, reducing the outward flare 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 meet the accuracy and stability requirements of different power engineering projects.

[0047] The tower body 5 has a square cross-section, and the inlet of the tower body 5 adopts a single-slope change design, with the slope change point located below the conductor crossarm 3. This single-slope change design avoids the structural complexity caused by multiple slope changes, thus simplifying the tower design and reducing manufacturing and construction difficulties. Placing the slope change point below the conductor crossarm 3 helps optimize the stress distribution on the tower body 5, making the force transmission between the conductor and the tower body 5 more uniform and reducing the potential risks caused by excessive local stress on the tower body 5.

[0048] Secondly, to avoid the cross members of tower body 5 being under the same pressure, the lower part of the ground wire crossarm 1 and the conductor crossarm 3 uses an inverted "K" shape. The use of the inverted "K" shape can effectively avoid the problem of being under the same pressure caused by the cross members being under pressure in traditional structures, thereby reducing the local weaknesses of the tower body 5 structure and improving the overall stability.

[0049] The tower leg 7 is connected to the ground foundation by anchor bolts. As a connecting component, the anchor bolts have high tensile strength and shear strength, are easy to construct, and can effectively resist the action of external loads (such as wind, earthquake, etc.) on the tower body 5, preventing loosening or displacement between the tower leg 7 and the foundation.

[0050] In summary, this utility model increases the height of the jumper wire 8 by placing the jumper wire bracket 2 at the ground wire crossarm 1, thus avoiding insufficient ground clearance caused by the jumper wire string being too close to the side near the steep mountain, which would force the tower height to be increased. This reduces the height of the conductor suspension point on the tower and decreases the weight of the transmission tower. By adding a tower leg extension section 6 at the long leg, the range of height difference between the high and low legs of the tower is increased, avoiding the problem of excessively small angle between the main material and the diagonal material of the long leg and the flatness of the diagonal material of the short leg, thus optimizing the stress pattern of the tower leg 7 structure. At the same time, by increasing the difference between the tower legs 7, excessive squareness of the base surface of the short legs is avoided, reducing the damage to the ecological environment. Increasing the range of difference also avoids high outcrops in the foundation of the long legs, making it easier for construction units to construct high-formwork foundations in steep mountainous areas and reducing construction risks.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC transmission tower for steep mountainous areas with large step differences, characterized in that, From bottom to top, it includes tower leg (7), tower leg extension (6), tower body (5) and tower head (4) connected in turn; the top of the tower head (4) is horizontally provided with a ground wire cross arm (1); the ground wire cross arm (1) is provided with a ground wire hanging point; the ground wire hanging point is connected with the ground wire; both ends of the ground wire cross arm (1) are provided with a jumper support (2); the outer side of the jumper support (2) is symmetrically provided with a jumper hanging point; the tower body (5) is symmetrically provided with a conductor cross arm (3) along the central axis; the outer side of the end of the conductor cross arm (3) is symmetrically provided with a conductor hanging point; the conductor hanging point is connected with the conductor; the power transmission tower further comprises a conductor jumper (8), one end of the conductor jumper (8) is connected with the jumper hanging point, and the other end is connected with the lower plane of the ground wire cross arm (1); the conductor is connected with the conductor jumper (8).

2. The DC power transmission tower for steep mountainous areas with large differential according to claim 1, characterized in that, The tower leg (7) is a full-range high-low leg; the longest tower leg (7) and the tower body (5) are provided with a tower leg extension (6).

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

4. The DC power transmission tower for steep mountainous areas with large step difference according to claim 2, characterized in that, The tower leg extension (6) is connected with the tower body (5) and the longest tower leg (7) through inner angle steel and outer paste plate type bolt.

5. The DC transmission tower for steep mountainous areas with large step difference according to claim 2, characterized in that, The tower leg extension (6) adopts inclined material and is arranged in cross material.

6. The DC transmission tower for steep mountainous areas with large step difference according to claim 1, characterized in that, The conductor jumper (8) is in "L" string type, and the conductor is connected with the conductor jumper (8) in shangrao type.

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

8. The DC transmission tower for steep mountainous areas with large step difference according to claim 1, characterized in that, The jumper support (2) is in triangular pyramid type.

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

10. The DC transmission tower for steep mountainous areas with large step difference according to claim 1, characterized in that, The tower leg (7) is connected with the ground foundation through foundation bolts.

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