Construction method for boosting and capacity increasing transformation of power transmission tower

Abstract

The invention relates to a construction method for boosting and capacity-increasing transformation of a power transmission tower, which divides the two sides of the plane of a tower body into a first side and a second side along the plane of the center line of the tower body, and comprises the following steps: S1, sequentially dismantling a plurality of suspension insulators and a plurality of original cross arms on the first side of the tower body from top to bottom; s2, sequentially suspending the assembled composite cross arms, and sequentially mounting the composite cross arms on the first side of the tower body from top to bottom; s3, the multiple suspension insulators and the multiple original cross arms located on the second side of the tower body are sequentially dismantled from top to bottom; and S4, sequentially suspending the other plurality of assembled composite cross arms, and sequentially mounting the composite cross arms on the second side of the tower body from top to bottom. According to the construction method, an original cross arm structure can be replaced with the composite cross arm on the basis of a main tower structure of an original power transmission tower, and boosting and capacity increasing transformation of the power transmission tower is achieved.

Description

Technical Field

[0001] The present application relates to the field of electric power transmission technology, and in particular to a construction method for voltage-boosting and capacity-increasing transformation of a transmission tower. Background Art

[0002] Transmission towers are pole-shaped or tower-shaped structures that support overhead transmission line conductors and overhead ground wires, and keep a safe distance between the transmission line conductors and the ground wire, between the transmission line conductors and the earth, and between the ground wire and the earth. With the development of the economy, the regional load has increased year by year, and the original traditional transmission lines can no longer meet the growing demand of user loads. To solve this problem, it is necessary to increase the transmission capacity of the transmission line.

[0003] For conventional double-circuit steel pipe poles, there are two main conventional methods that can be used to increase the transmission capacity of the transmission line. The first is to use the boosting method, by transferring the transmission line connection from the low-voltage transformer outlet interval to the high-voltage transformer outlet interval, to increase the voltage level of the original transmission line, thereby increasing the electric energy. In this way, due to the increase in voltage level, the electrical clearance to be met is larger, and the original transmission line often cannot meet the requirements. Therefore, it is usually necessary to dismantle the original transmission line as a whole, and build a new transmission line with a higher voltage level on its basis. There are problems of long construction period and high cost. In addition, due to the increase in the voltage level of the transmission line, the corridor width becomes larger, and additional land acquisition is inevitable. It is difficult to achieve in areas with tight land resources and the land acquisition cost is high.

[0004] The second method is to increase capacity by replacing the original transmission line conductors with conductors with larger transmission capacity. Through power system flow control and scheduling, the new conductors can transmit more current at the same voltage level, that is, increase the current I of the transmission line, thereby increasing the electric energy. This method usually requires the removal of the original transmission line conductors of the entire line and the installation of new large-capacity conductors on the original transmission towers. Since the transmission tower has not changed, in order to ensure that the force on the transmission tower does not exceed the design value after the conductor is replaced, some of the rods in the transmission tower can be strengthened, so that the transmission tower can withstand a larger load. However, due to the limited increase in the strength of the transmission tower by the strengthened rods, the specifications of the large-capacity conductors selected are usually limited, and the increase in the capacity and current carrying capacity of the conductors is also limited. Generally, the effect after the transformation is not as good as the above-mentioned boosting method. Summary of the invention

[0005] Based on this, it is necessary to provide a construction method for the voltage increase and capacity increase of transmission towers in response to the technical problems mentioned above.

[0006] The present application provides a construction method for voltage-boosting and capacity-increasing transformation of a transmission tower, wherein the two sides of the tower body located on the plane where the center line of the tower body is located are divided into a first side and a second side, and the method comprises the following steps: S1: removing a plurality of suspension insulators and a plurality of original cross arms located on the first side of the tower body in order from top to bottom; S2: suspending a plurality of assembled composite cross arms in order, and installing them in order from top to bottom on the first side of the tower body; S3: removing a plurality of suspension insulators and a plurality of original cross arms located on the second side of the tower body in order from top to bottom; S4: suspending another plurality of assembled composite cross arms in order, and installing them in order from top to bottom on the second side of the tower body.

[0007] In one embodiment, three suspension insulators and three original cross arms are respectively arranged on the first side and the second side of the tower body from top to bottom to hang the double-circuit conductor, and the construction method for the voltage-increasing and capacity-increasing transformation of the transmission tower includes the following steps: S1: dismantling the three suspension insulators and the three original cross arms on the first side of the tower body in order from top to bottom; S2: suspending the three assembled composite cross arms in order, and installing them in order from top to bottom on the first side of the tower body; S3: dismantling the three suspension insulators and the three original cross arms on the second side of the tower body in order from top to bottom; S4: suspending the other three assembled composite cross arms in order, and installing them in order from top to bottom on the second side of the tower body.

[0008] In one embodiment, six suspension insulators and six original cross arms are respectively arranged on the first side and the second side of the tower body from top to bottom to hang four-circuit conductors, and the construction method for the voltage-increasing and capacity-increasing transformation of the transmission tower includes the following steps: S1: dismantling the six suspension insulators and the six original cross arms on the first side of the tower body in order from top to bottom; S2: suspending the six assembled composite cross arms in order, and installing them in order from top to bottom on the first side of the tower body; S3: dismantling the six suspension insulators and the six original cross arms on the second side of the tower body in order from top to bottom; S4: suspending the other six assembled composite cross arms in order, and installing them in order from top to bottom on the second side of the tower body.

[0009] In one embodiment, a suspension insulator and an original cross arm are arranged on the first side of the tower body, and two suspension insulators and two original cross arms are arranged in sequence from top to bottom on the second side of the tower body, and the three original cross arms are arranged in an "up" shape to hang a single-circuit conductor. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower comprises the following steps: S1: removing a suspension insulator and an original cross arm located on the first side of the tower body;

[0010] S2: Suspend an assembled composite crossarm and install it on the first side of the tower body; S3: Remove the two suspension insulators and two original crossarms on the second side of the tower body in order from top to bottom; S4: Suspend the other two assembled composite crossarms in turn and install them in order from top to bottom on the second side of the tower body.

[0011] In one embodiment, before step S1, a power outage operation is performed on the transmission tower to be modified, and the wires hung on the first side of the transmission tower to be modified are removed, so that the first side of the transmission tower to be modified is in a state where no wires are hung; before step S3, the wires hung on the second side of the transmission tower to be modified are removed, so that the second side of the transmission tower to be modified is in a state where no wires are hung.

[0012] In one embodiment, before step S1, the conductor located on the first side of the transmission tower to be modified is hoisted with power, so that the conductor is away from the transmission tower to be modified and the ground; before step S3, the conductor located on the second side of the transmission tower to be modified is hoisted with power, so that the conductor is away from the transmission tower to be modified and the ground.

[0013] In one embodiment, before step S2 and step S4, a mounting portion is provided on the tower body, and the composite cross arm is mounted on the tower body through the mounting portion.

[0014] In one embodiment, the mounting portion includes one or more of a mounting hole, a mounting plate, and a clamp.

[0015] In one embodiment, the composite cross arm is suspended to a preset position by a suspension mechanism, and the suspension mechanism includes a drone, a crane, a helicopter, or a pulley block.

[0016] In one embodiment, before step S1, the ground wire is temporarily suspended, the original ground wire bracket is removed, a new ground wire bracket is suspended and installed on the tower body, and the temporarily suspended ground wire is reinstalled on the new ground wire bracket.

[0017] In one embodiment, before step S1, the ground wire is removed, the original ground wire bracket is removed, a new ground wire bracket is suspended and installed on the tower body, and the new ground wire is installed on the new ground wire bracket.

[0018] In one embodiment, the tower body is an angle steel tower or a steel pipe pole.

[0019] The beneficial effects of the present application are: 1) voltage level improvement: double-circuit steel pipe poles can be upgraded from 230kV to 345kV, and double-circuit angle steel towers can be upgraded from 275kV to 400kV. There is no need to dismantle the original transmission line to build a new higher voltage transmission line, and the original tower can be upgraded, which requires less material, short construction period and low cost; 2) saving corridor width: the corridor width of the double-circuit steel pipe pole is compressed from 37m before the boost to 33m after the boost, and the corridor width of the double-circuit angle steel tower is compressed from 45.7m before the boost to 45.5m after the boost, without large-scale land acquisition, avoiding land acquisition costs and saving land resources; 3) increased transmission capacity: the transmission capacity of the double-circuit steel pipe pole after the boost is increased by 125% compared with that before the boost, and the transmission capacity of the double-circuit angle steel tower after the boost is increased by 116% compared with that before the boost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 It is a schematic diagram of the plan structure of a modified transmission tower provided in one embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the plan structure of a transmission tower to be modified provided in one embodiment of the present application;

[0023] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 4 yes Figure 1 The enlarged view of point B in the middle;

[0025] Figure 5 is a schematic diagram of the planar structure of a modified transmission tower provided in another embodiment of the present application;

[0026] Figure 6 is a schematic diagram of the planar structure of a transmission tower to be modified provided by another embodiment of the present application;

[0027] Figure 7 is a schematic diagram of the plan structure of a modified transmission tower provided by another embodiment of the present application;

[0028] Figure 8 It is a schematic diagram of the plan structure of a modified transmission tower provided in another embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below. If these terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0030] The voltage-boosting and capacity-increasing transformation of the present application is used to transform the traditional transmission tower to increase the transmission capacity of the transmission line. The tower body of the traditional transmission tower can be a steel pipe pole, an angle steel tower or other tower types. The tower body of the transmission tower is connected with the original cross arm, and the end of the original cross arm is also connected with a suspension insulator, and then the wire is hung by setting a wire hanging fitting at the end of the suspension insulator. The original cross arm can be an angle steel cross arm, or a wooden cross arm or other forms of cross arms, which are not limited here.

[0031] The present application specifically provides a construction method for the voltage-increasing and capacity-increasing transformation of a transmission tower. For the convenience of description, the conventional transmission tower before transformation is referred to as the transmission tower to be transformed, and the transmission tower after transformation is referred to as the transformed transmission tower. The construction method of the present application is used to transform, for example, Figure 2 The transmission tower to be transformed is shown as follows Figure 1 The modified transmission tower shown, therefore, this application first introduces in detail the structure and design of the transmission tower to be modified and the modified transmission tower.

[0032] It should be noted that since the tower body before and after the renovation remains unchanged, the tower body after the renovation is represented by the same number as the tower body before the renovation, and for the convenience of comparison, other structures of the transmission tower after the renovation and the corresponding structures of the transmission tower to be renovated are represented by different numbers.

[0033] See also Figure 2In one embodiment, the transmission tower to be modified includes a tower body 11, an original cross arm 111 and a suspension insulator 1111. The tower body 11 is a steel pipe pole with a circular cross section. The first end of the original cross arm 111 is connected to the tower body 11 through a tower body flange tube 14 and a tower body flange plate 15. The second end of the original cross arm 111 is hung with a suspension insulator 1111. The end of the suspension insulator 1111 away from the original cross arm 111 is hung with a conductor of a transmission line. One end of the tower body flange tube 14 is fixedly connected to the tower body 11, and the other end is connected to the tower body flange plate 15. The original cross arm 111 is connected to the tower body 11 by being fixedly connected to the tower body flange plate 15. In this embodiment, the number of the original cross arms 111 is six. Along the plane where the center line L of the tower body 11 is located, the two sides of the tower body 11 located on the plane are divided into a first side 101 and a second side 102, wherein three original cross arms 111 are located on the first side 101 of the tower body 11, and the other three original cross arms 111 are located on the second side 102 of the tower body 11, and the original cross arms 111 on the first side 101 and the original cross arms 111 on the second side 102 are symmetrically arranged, that is, the two original cross arms 111 on the tower body 11 corresponding to the two sides of the tower body 11 are fixed on the two sides of the same height of the tower body 11. A suspension insulator 1111 is provided at the end of each original cross arm 111, and then the suspension insulator 1111 is also provided with six, and a phase conductor is suspended at the end of each suspension insulator 1111, so that it can be used to hang the conductor of the double-circuit transmission line.

[0034] See also Figure 1 , Figure 1 For Figure 2 The structure of the transmission tower after the transformation of the transmission tower to be transformed mainly includes the original cross arm 111 and the suspension insulator 1111. The original cross arm 1111 is transformed into a composite cross arm 100, and the suspension insulator 1111 is removed. The transformed transmission tower includes a tower body 11 and a composite cross arm 100. The first end of the composite cross arm 100 is connected to the tower body 11. The second end of the composite cross arm 100 is provided with an end fitting. The end fitting is provided with a conductor hanging point for hanging a phase conductor.

[0035] In this embodiment, the number of composite cross arms 100 is six. Along the plane where the center line L of the tower body 11 is located, the two sides of the tower body 11 located on the plane are divided into a first side 101 and a second side 102, wherein three composite cross arms 100 are arranged at intervals on the first side 101 of the tower body 11 along the vertical direction, and another three composite cross arms 100 are symmetrically arranged on the second side 102 of the tower body 11, thereby forming six wire hanging points for hanging double-circuit wires. In other embodiments, the number of composite cross arms can also be other numbers, for example, the number of composite cross arms can be three, one composite cross arm is arranged on the first side of the tower body, and two composite cross arms are arranged on the second side of the tower body to hang single-circuit wires; or other numbers of composite cross arms can be arranged on both sides of the tower body to hang wires of different circuits. In summary, the present application does not limit the number and arrangement of the composite cross arms 100 of the modified transmission tower to adapt to the hanging of different forms of transmission line wires.

[0036] In this embodiment, the composite cross arm 100 includes a post insulator 110 and a diagonal insulator 120, the second end of the post insulator 110 and the second end of the diagonal insulator 120 are connected together through end fittings, the first end of the post insulator 110 and the first end of the diagonal insulator 120 are respectively connected to two different positions of the tower body 11, and the first end of the post insulator 110 and the first end of the diagonal insulator 120 are located on the same vertical line, so that the composite cross arm 100 and the tower body 11 are in a stable triangular structure as a whole, which can ensure the stability of the composite cross arm 100. Among them, the diagonal insulator 120 is located above the post insulator 110. In other embodiments, the composite cross arm can also be other structures, for example, it can be composed of other numbers of post insulators and other numbers of diagonal insulators, which is not limited here.

[0037] Based on the above-mentioned transmission tower to be transformed and the transformed transmission tower, the construction method for voltage-increasing and capacity-increasing transformation of the transmission tower provided in this application includes the following steps:

[0038] S1: Remove the three suspension insulators 1111 and the three original cross arms 111 located on the first side 101 of the tower body 11 in order from top to bottom.

[0039] The three suspension insulators 1111 may be removed first, and then the three original cross arms 111 may be removed. Alternatively, each layer of the suspension insulators 1111 and the original cross arms 111 may be removed in sequence.

[0040] S2: The three assembled composite cross arms 100 are suspended in sequence and installed on the first side 101 of the tower body 11 in order from top to bottom.

[0041] The composite crossarm 100 is first assembled on the ground, that is, the post insulator 110 and the inclined insulator 120 are connected together through the end fittings. The three composite crossarms 100 can be fixedly connected to the connection between the three original crossarms 111 on the first side 101 and the tower body, or fixed to other positions of the tower body 11.

[0042] S3: Remove the three suspension insulators 1111 and the three original cross arms 111 located on the second side 102 of the tower body 11 in order from top to bottom.

[0043] The method of removing the original cross arm 111 in this step is the same as the method of removing the first side 101 described above, and will not be described in detail.

[0044] S4: The other three assembled composite cross arms 100 are suspended in sequence and installed on the second side 102 of the tower body 11 in order from top to bottom.

[0045] The composite cross arm 100 may be fixed to the connection between the original cross arm 111 of the original second side 102 and the tower body, or may be fixed to other positions of the tower body 11 .

[0046] In the above-mentioned voltage-boosting and capacity-increasing process, the transmission capacity of the transmission line is increased by transforming the traditional transmission tower, dismantling the original crossarms of the transmission tower to be transformed, such as iron crossarms, angle steel crossarms, etc., and canceling the suspension insulators. New composite crossarms are reinstalled on the tower body. The composite crossarms are assembled with insulating composite materials and metal joints. The structure and main material specifications can be flexibly adjusted according to the actual design load. They are not only insulated themselves, but also have good mechanical properties. After the voltage-boosting and capacity-increasing of the traditional transmission tower, the traditional suspension insulators can be omitted. The conductors are suspended on the composite crossarms through shorter hanging wire fittings, which raises the conductor hanging height, reduces the wind deviation amplitude, and can increase the insulation distance between the conductor and the tower body, releasing the safety gap. Before and after the transformation, the length of the composite crossarm can be guaranteed to be the same or similar to the length of the original crossarm, meeting the voltage-boosting and capacity-increasing requirements within a certain range. There is no need to dismantle the original transmission line to build a new higher voltage transmission line, and the original tower can be boosted. The required amount of materials is small, the construction period is short, the cost is low, and the construction cost is low. There is no need to carry out large-scale land acquisition, which solves the corridor problem and reduces the land acquisition cost. After the voltage is boosted, the transmission capacity is increased to meet the rapidly growing load requirements.

[0047] The modification process of the above-mentioned transmission tower may involve the possibility of changing the original ground wire bracket 112 located at the top of the tower body 11. For example, when the lightning protection angle of the transmission tower changes and it is necessary to reinforce the original ground wire bracket 112, targeted modifications are required to transform it into a new ground wire bracket 200.

[0048] In one embodiment, when the original ground wire support 112 needs to be modified and the ground wire is not replaced, before removing the three original cross arms 111 located on the first side 101 of the tower body 11, it is necessary to temporarily lift the ground wire using a crane, a drone or other tools, away from the construction range, and then remove the original ground wire support 112, suspend and install the new ground wire support 200 on the tower body 11, and finally reinstall the temporarily suspended ground wire on the new ground wire support 200. In another embodiment, when the original ground wire support 112 needs to be modified and the ground wire is replaced, before removing the three original cross arms 111 located on the first side 101 of the tower body 11 in order from top to bottom, remove the ground wire, remove the original ground wire support 112, suspend and install the new ground wire support 200 on the tower body 11, and finally install the new ground wire on the new ground wire support 200.

[0049] It is understandable that the original ground wire bracket 112 is first modified, and then the three original cross arms 111 located on the first side 101 of the tower body 11 are removed from top to bottom in order to prevent the suspension operation at a higher place from causing damage to the transmission tower structure at a lower place.

[0050] The removal of the original cross arm 111 on the first side 101 of the tower body 11 can be a power-off operation or a live operation. In one embodiment, before removing the three original cross arms 111 on the first side 101 of the tower body 11, the power transmission tower to be modified is firstly powered off, and then the wires hung on the first side 101 of the transmission tower to be modified are removed, so that the first side 101 of the transmission tower to be modified is in a state where no wires are hung, and then the transmission tower is modified in the above-mentioned manner. This method is suitable for the full-line modification of the transmission line.

[0051] In another embodiment, before removing the three original cross arms 111 located on the first side 101 of the tower body 11, when the first side 101 of the transmission tower to be modified is in a state of hanging wires, that is, when the wires do not need to be removed, the wires located on the first side 101 of the transmission tower to be modified can be lifted with electricity using the equipotential operation method, so that the wires are away from the transmission tower to be modified and the ground, as long as the safety distance of the live operation is ensured, and then the original cross arms 111 are removed, and the transmission tower is modified in the above manner. This method of suspension does not require power outage operations and is suitable for modifying a specific transmission tower or a transmission tower modification of a certain line.

[0052] When the composite cross arm 100 is installed on the first side 101 of the tower body 11 , a mounting portion may be provided on the tower body 11 before the composite cross arm 100 is suspended, and then the composite cross arm 100 may be installed on the tower body 11 through the mounting portion.

[0053] In one embodiment, in combination Figure 3The mounting portion includes a mounting plate 12 and a mounting hole 13. The mounting plate 12 is fixed on the tower body 11. The mounting hole 13 is set on the mounting plate 12. The first end of the post insulator 110 or the first end of the inclined insulator 120 is connected to the mounting plate 12 through the mounting hole 13, and then connected to the first side 101 of the tower body 11. The mounting plate 12 is a plate member, which can be set to an adaptive shape, size, etc. according to the installation requirements of the composite crossarm 100, and then the mounting plate 12 is installed on the tower body 11, and a mounting structure foundation suitable for installing the composite crossarm 100 is constructed on the tower body 11, and then connected to the composite crossarm 100 through connecting components such as threaded components and clamping components that can be inserted into the mounting hole 13, so that the composite crossarm 100 can be quickly installed on the first side 101 of the tower body 11 with the help of the mounting plate 12 and the mounting hole 13.

[0054] In another embodiment, the mounting portion is a clamp (not shown), which is sleeved on the periphery of the tower body 11, and the first end of the support insulator 110 or the first end of the inclined insulator 120 is connected to the tower body 11 through the clamp. The clamp can be set to an adaptive shape, size, etc. according to the installation requirements of the composite crossarm 100, and then the clamp is installed on the tower body 11, and a mounting structure foundation suitable for the composite crossarm 100 is constructed on the tower body 11, and then connected to the composite crossarm 100 through cooperation with other connecting components, so that the composite crossarm 100 can be quickly installed on the first side 101 of the tower body 11 with the help of the clamp.

[0055] In other embodiments, the mounting portion may be a mounting plate, a clamp, or may be a combination of several to achieve a stable installation of the composite crossarm. Of course, the mounting portion may also be a structure other than the above-mentioned structure, as long as it can facilitate the installation of the composite crossarm and ensure the stability of the installation. The mounting plate, clamp and other mounting portion structures may be fixedly connected to the tower body by welding or the like, or may be integrally formed and arranged, and there is no limitation here.

[0056] See also Figure 2 and Figure 4 Since the tower body 11 of the transmission tower to be modified is already equipped with a tower body flange tube 14 and a tower body flange plate 15, which are used to be fixedly connected with the end flange plate arranged at the end of the original cross arm 111, and the end flange plate arranged at the end of the support insulator 110 of the modified transmission tower can also be matched and connected with the tower body flange plate 15, therefore, when the installation height and size of the support insulator 110 are not much changed compared with the original cross arm 111, the tower body flange tube 14 and the tower body flange plate 15 can be retained after the original cross arm 111 is removed, and the tower body flange plate 15 and the end flange plate of the support insulator 110 are matched and connected to achieve the fixed connection between the support insulator 110 and the tower body 11.

[0057] It is understandable that in this embodiment, since the overall voltage boost of the transmission tower is relatively small, the installation height and size of the support insulator 110 do not change much, so the support insulator 110 can be fixedly connected to the connection between the original cross arm 111 and the tower body 11, and the composite cross arm 100 can be installed on the tower body 11 using the tower body flange tube 14 and the tower body flange plate 15 on the tower body 11. In other embodiments, there is a relatively large overall voltage boost of the transmission tower or other special circumstances. Compared with the original cross arm 111, the installation height and size of the support insulator 110 need to be recalculated and adjusted, and it cannot be fixedly connected to the connection between the original cross arm 111 and the tower body 11. After removing the original cross arm 111, the tower body flange tube 14 and the tower body flange plate 15 need to be removed, and the installation part needs to be re-set on the tower body 11, and then the assembled composite cross arm 100 is suspended in sequence, and the composite cross arm 100 is installed on the tower body 11 through the installation part. The specific structure of the installation part is as described above, and will not be repeated in detail. In other words, the above-mentioned transformation method can expand the scope of application of transmission tower voltage boosting and capacity increase. It can be applied to the transformation of transmission towers with a smaller voltage boosting range, as well as the transformation of transmission towers with a larger voltage boosting range.

[0058] The composite cross arm 100 is suspended to a preset position by a suspension mechanism, and the suspension mechanism includes a drone or a crane or a helicopter or a pulley block. The suspension mechanism can be selected from one of the drones or cranes or helicopters or a pulley block, or several of them can be selected to achieve a stable suspension of the composite cross arm 100. Of course, the suspension mechanism can also be other tools besides the above tools, which is not limited here. During the entire suspension process, since the composite cross arm 100 has been assembled, the overall size is large, and the preset position is located on the tower body 11 below the new ground wire support 200, the composite cross arm 100 can be fixed with a windproof rope to prevent it from shaking during the suspension process, and then colliding with other structures such as the new ground wire support 200 to cause damage.

[0059] After the composite crossarm 100 on the first side 101 of the tower body 11 is installed, the wire to be hung on the first side 101 is hung again on the composite crossarm 100 on the first side 101, and the suspended wire or the replaced new wire is installed on the composite crossarm 100 on the first side 101, and then the original crossarm 111 on the second side 102 of the tower body 11 is removed according to the same steps as the first side 101, and the composite crossarm 100 on the second side 102 of the tower body 11 is installed.

[0060] The removal of the original cross arm 111 on the second side 102 of the tower body 11 can be done with a power outage or with power on. In one embodiment, before removing the three original cross arms 111 on the second side 102 of the tower body 11, the power transmission tower to be modified is firstly powered off, and then the wires hung on the second side 102 of the transmission tower to be modified are removed, so that the second side 102 of the transmission tower to be modified is in a state where no wires are hung, and then the transmission tower is modified in the aforementioned manner. This method is applicable to the entire line modification of the transmission line.

[0061] In another embodiment, before removing the three original cross arms 111 located on the second side 102 of the tower body 11, when the second side 102 of the transmission tower to be modified is in a state of hanging wires, that is, when the wires do not need to be removed, the wires located on the second side 102 of the transmission tower to be modified can be lifted with electricity using the equipotential operation method, so that the wires are kept away from the transmission tower to be modified and the ground, as long as the safety distance of the live operation is ensured, and then the original cross arms 111 are removed, and the transmission tower is modified in the above manner. This method of suspension does not require power outage operations and is suitable for modifying a specific transmission tower or a transmission tower modification of a certain line.

[0062] When the composite cross arm 100 is installed on the second side 102 of the tower body 11, a mounting portion may be provided on the tower body 11 before the composite cross arm 100 is suspended, and then the composite cross arm 100 is installed on the tower body 11 through the mounting portion. The specific structure of the mounting portion is as described above and will not be described in detail here.

[0063] It can be understood that by dividing the tower body 11 into a first side 101 and a second side 102, first modifying and installing the first side 101 from top to bottom, and then modifying and installing the second side 102 from top to bottom, mutual interference between components can be avoided, and equipment can be reused, simplifying the construction process and saving costs.

[0064] See also Figure 5 and Figure 6 In another embodiment, the tower body 11 of the transmission tower to be transformed is as follows Figure 6 The traditional tower shown needs to be transformed into Figure 5 The modified transmission tower is shown.

[0065] In this embodiment, the transmission tower to be reconstructed includes a tower body 11, an original cross arm 111 and a suspension insulator 1111. The tower body 11 is an angle steel tower. The first end of the original cross arm 111 is connected to the tower body 11. The second end of the original cross arm 111 is hung with a suspension insulator 1111. The end of the suspension insulator 1111 away from the original cross arm 111 is hung with a conductor of the transmission line. There are six original cross arms 111. Along the plane where the center line L of the tower body 11 is located, the two sides of the tower body 11 located on the plane are divided into a first side 101 and a second side 102. Three of the original cross arms 111 are located on the first side 101 of the tower body 11, and the other three original cross arms 111 are located on the second side 102 of the tower body 11. Figure 2 The modified transmission tower is similar and will not be described in detail.

[0066] See also Figure 5 , Figure 5 For Figure 6 The structure of the transmission tower after the transformation of the transmission tower to be transformed mainly includes the original cross arm 111 and the suspension insulator 1111. The original cross arm 111 is transformed into a composite cross arm 100, and the suspension insulator 1111 is removed. The transformed transmission tower includes a tower body 11 and a composite cross arm 100. The first end of the composite cross arm 100 is connected to the tower body 11. The second end of the composite cross arm 100 is provided with an end fitting. The end fitting is provided with a conductor hanging point for hanging a phase conductor.

[0067] In this embodiment, the number of composite cross arms 100 is six. Along the plane where the center line L of the tower body 11 is located, the two sides of the tower body 11 located on the plane are divided into a first side 101 and a second side 102, wherein three composite cross arms 100 are arranged at intervals on the first side 101 of the tower body 11 in the vertical direction, and another three composite cross arms 100 are symmetrically arranged on the second side 102 of the tower body 11, thereby forming six wire hanging points for hanging double-circuit wires. In this embodiment, the composite cross arm 100 includes two post insulators 110 and two inclined insulators 120, the second ends of the post insulators 110 and the second ends of the inclined insulators 120 are connected together through end fittings, and the first ends of the post insulators 110 and the first ends of the inclined insulators 120 are respectively connected to different positions of the tower body 11, so that the composite cross arm 100 and the tower body 11 are in a stable quadrangular pyramid structure as a whole, which can ensure the stability of the composite cross arm 100. In other embodiments, the composite cross-arm may also be of other structures, for example, may be composed of other numbers of post insulators and other numbers of inclined insulators, which is not limited here.

[0068] It can be understood that in this embodiment, since the specific structure and quantity of the original cross arm 111 of the transmission tower to be modified and the composite cross arm 100 of the modified transmission tower are consistent with the above, the specific steps of the construction method for boosting and increasing the capacity of the transmission tower to be modified in this embodiment are also consistent with the above, and will not be elaborated here.

[0069] In other embodiments, according to different wire hanging requirements, different numbers of original cross arms can be correspondingly arranged on the tower body of the transmission tower to be modified, so different numbers of composite cross arms are also arranged on the tower body of the modified transmission tower. For example, in another embodiment, six original cross arms are arranged in sequence from top to bottom on the first side 101 and the second side 102 of the tower body 11 of the transmission tower to be modified, respectively, to hang four-circuit wires, and the transmission tower to be modified is modified as follows: Figure 7 As shown in the modified transmission tower, six composite cross arms 100 are arranged on the first side 101 and the second side 102 of the tower body 11 of the modified transmission tower from top to bottom, respectively, to form twelve ends for hanging conductors, so that the modified transmission tower can be used for hanging four-circuit conductors.

[0070] Based on the above transmission tower, the construction method for voltage-increasing and capacity-increasing transformation of the transmission tower provided in this application includes the following steps:

[0071] S1: six suspension insulators and six original cross arms located on the first side 101 of the tower body 11 are removed in sequence from top to bottom.

[0072] S2: The six assembled composite cross arms 100 are suspended in sequence and installed on the first side 101 of the tower body 11 in order from top to bottom.

[0073] S3: Remove the six suspension insulators and the six original cross arms located on the second side 102 of the tower body 11 in order from top to bottom.

[0074] S4: The other six assembled composite cross arms 100 are suspended in sequence and installed on the second side 102 of the tower body 11 in order from top to bottom.

[0075] The rest of the steps are the same as those described above and will not be described in detail. The composite cross arm 100 can be fixed to the connection between the original cross arm and the tower body 11 or to other positions of the tower body 11 .

[0076] In another embodiment, an original cross arm is arranged on the first side 101 of the tower body 11 of the power transmission tower to be transformed, and two original cross arms are arranged on the second side 102 of the tower body 11 from top to bottom, and the three original cross arms are arranged in an "up" shape to hang a single-loop conductor, so that the power transmission tower to be transformed is transformed as follows: Figure 8The modified transmission tower shown in the figure has a composite cross arm 100 disposed on the first side 101 of the tower body 11 of the modified transmission tower, and two composite cross arms 100 are disposed on the second side 102 of the tower body 11 from top to bottom in sequence, and the three composite cross arms 100 are distributed in the shape of an "up" character to form three ends for hanging conductors, so that the modified transmission tower can be used for hanging single-circuit conductors.

[0077] Based on the above transmission tower, the construction method for voltage-increasing and capacity-increasing transformation of the transmission tower provided in this application includes the following steps:

[0078] S1: removing a suspension insulator and an original cross arm located at the first side 101 of the tower body 11 .

[0079] S2: Suspending an assembled composite cross arm 100 and installing it on the first side 101 of the tower body 11 .

[0080] S3: Remove the two suspension insulators and the two original cross arms located on the second side 102 of the tower body 11 in order from top to bottom.

[0081] S4: The other two assembled composite cross arms 100 are suspended in sequence and installed on the second side 102 of the tower body 11 in order from top to bottom.

[0082] The rest of the steps are the same as those described above and will not be described in detail. The composite cross arm 100 can be fixed to the connection between the original cross arm and the tower body 11 or to other positions of the tower body 11 .

[0083] Of course, the two original cross arms on the second side 102 of the tower body 11 may be removed first to install two composite cross arms 100, and then one original cross arm on the first side 101 of the tower body 11 may be removed to install one composite cross arm 100, which will not be described in detail.

[0084] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides a construction method for the voltage-increasing and capacity-increasing transformation of a transmission tower, by dismantling the original cross-arm structure of the original transmission tower to be transformed and installing a new composite cross-arm. The composite cross-arm can omit the traditional suspension insulator, so that the conductor is suspended on the composite cross-arm through a shorter hanging wire fitting, raising the conductor hanging height, reducing the wind deflection amplitude, increasing the insulation distance between the live part and the tower body, releasing the safety gap, and ensuring that the length of the composite cross-arm is the same or similar to the length of the original cross-arm before and after the transformation, meeting the voltage-increasing and capacity-increasing requirements within a certain range.

[0085] Specifically for double-circuit lines, the following effects can be achieved: 1) Voltage level improvement: double-circuit steel pipe poles can be upgraded from 230kV to 345kV, and double-circuit angle steel towers can be upgraded from 275kV to 400kV. There is no need to dismantle the original transmission line to build a new higher voltage transmission line, and the original tower can be upgraded. The required amount of materials is small, the construction period is short, and the cost is low; 2) Save corridor width: The corridor width of the double-circuit steel pipe pole is compressed from 37m before the boost to 33m after the boost, and the corridor width of the double-circuit angle steel tower is compressed from 45.7m before the boost to 45.5m after the boost. There is no need for large-scale land acquisition, which avoids land acquisition costs and saves land resources; 3) Increased transmission capacity: The transmission capacity of the double-circuit steel pipe pole after the boost is increased by 125% compared with before the boost, and the transmission capacity of the double-circuit angle steel tower after the boost is increased by 116% compared with before the boost.

[0086] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A construction method for voltage-boosting and capacity-increasing transformation of a transmission tower, characterized in that: Along the plane where the center line of the tower body is located, the two sides of the tower body located on the plane are divided into a first side and a second side. The construction method for voltage-boosting and capacity-increasing transformation of the transmission tower comprises the following steps: S1: removing a plurality of suspension insulators and a plurality of original cross arms located on the first side of the tower body in order from top to bottom; S2: suspending the assembled composite cross arms in sequence, and installing them on the first side of the tower body in order from top to bottom; S3: removing a plurality of suspension insulators and a plurality of original cross arms located on the second side of the tower body in order from top to bottom; S4: Suspending the other several assembled composite cross arms in sequence, and installing them in sequence from top to bottom on the second side of the tower body.

2. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1 is characterized in that: The first side and the second side of the tower body are respectively provided with three suspension insulators and three original cross arms from top to bottom to hang double-circuit conductors. The construction method of the transmission tower voltage-increasing and capacity-increasing transformation comprises the following steps: S1: removing the three suspension insulators and the three original cross arms located on the first side of the tower body in order from top to bottom; S2: suspending the three assembled composite cross arms in sequence, and installing them on the first side of the tower body in order from top to bottom; S3: removing the three suspension insulators and the three original cross arms located on the second side of the tower body in order from top to bottom; S4: Suspending the other three assembled composite cross arms in sequence, and installing them on the second side of the tower body in sequence from top to bottom.

3. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: The first side and the second side of the tower body are respectively provided with six suspension insulators and six original cross arms from top to bottom to hang four-circuit conductors. The construction method of the transmission tower voltage-increasing and capacity-increasing transformation comprises the following steps: S1: removing the six suspension insulators and the six original cross arms located on the first side of the tower body in order from top to bottom; S2: suspending the six assembled composite cross arms in sequence, and installing them on the first side of the tower body in order from top to bottom; S3: removing the six suspension insulators and the six original cross arms located on the second side of the tower body in order from top to bottom; S4: Suspending the other six assembled composite cross arms in sequence, and installing them on the second side of the tower body in sequence from top to bottom.

4. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1 is characterized in that: The first side of the tower body is provided with one suspension insulator and one original cross arm, and the second side of the tower body is provided with two suspension insulators and two original cross arms in sequence from top to bottom, and the three original cross arms are distributed in an "up" shape to hang a single-circuit conductor. The construction method for the voltage-increasing and capacity-increasing transformation of the transmission tower comprises the following steps: S1: removing one of the suspension insulators and one of the original cross arms located on the first side of the tower body; S2: suspending the assembled composite cross arm and installing it on the first side of the tower body; S3: removing the two suspension insulators and the two original cross arms located on the second side of the tower body in order from top to bottom; S4: Suspending the other two assembled composite cross arms in sequence, and installing them on the second side of the tower body in sequence from top to bottom.

5. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1 is characterized in that: Before step S1, the power transmission tower to be modified is powered off, and the wires hung on the first side of the power transmission tower to be modified are removed, so that the first side of the power transmission tower to be modified is in a state where the wires are not hung; Before step S3, the wire hung on the second side of the transmission tower to be modified is removed, so that the second side of the transmission tower to be modified is in a state where the wire is not hung.

6. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1 is characterized in that: Before step S1, the conductor located on the first side of the transmission tower to be modified is hoisted with electricity, so that the conductor is away from the transmission tower to be modified and the ground; Before step S3, the conductor located on the second side of the transmission tower to be modified is suspended with power on, so that the conductor is away from the transmission tower to be modified and the ground.

7. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: Before step S2 and step S4, a mounting portion is provided on the tower body, and the composite cross arm is mounted on the tower body through the mounting portion.

8. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 7, characterized in that: The mounting portion includes one or more of a mounting hole, a mounting plate, and a clamp.

9. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: The composite cross arm is suspended to a preset position by a suspension mechanism, and the suspension mechanism includes a drone, a crane, a helicopter, or a pulley block.

10. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: Before step S1, the ground wire is temporarily suspended, the original ground wire bracket is removed, a new ground wire bracket is suspended and installed on the tower body, and the temporarily suspended ground wire is reinstalled on the new ground wire bracket.

11. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: Before step S1, the ground wire is removed, the original ground wire bracket is removed, a new ground wire bracket is suspended and installed on the tower body, and the new ground wire is installed on the new ground wire bracket.

12. The construction method for voltage-boosting and capacity-increasing transformation of a transmission tower according to claim 1, characterized in that: The tower body is an angle steel tower or a steel pipe pole.

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