A method and system for monitoring the internal force of a transmission tower leg diagonal

Abstract

The present disclosure provides a method and system for monitoring the internal force of the inclined member of the tower leg of a power transmission tower, which belongs to the technical field of overhead power transmission lines. The scheme comprises: taking the ground contact position of the long and short legs of the power transmission tower as the center of the moment of force to obtain the force arm of the long leg inclined member and the short leg inclined member, respectively; obtaining the first wind load at the intersection position of the tower main member and the tower body inclined member, and the second wind load at the intersection position of the tower main member and the leg inclined member; obtaining the horizontal force acting on the tower leg separation surface based on the first wind load and the second wind load; obtaining the internal force of the inclined member of the long leg and the short leg of the power transmission tower based on the principle of force balance, and monitoring the internal force of the inclined member of the tower leg of the power transmission tower according to the obtained internal force of the inclined member.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of overhead transmission lines, and particularly relates to a method and system for monitoring the internal force of a transmission tower leg inclined member. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute the prior art.

[0003] At present, the design of a transmission tower in the field of transmission lines in China adopts a linear space truss structure, and it is assumed that the self-supporting tower is composed of several plane trusses, and then the internal force of the plane trusses is analyzed. Although this method ignores the space effect of the truss and is an approximate calculation method, the error caused by this method is not large for most simple statically determinate structures or structures with low number of static indeterminacy, and therefore, it is still a simple and useful analysis method and is widely used.

[0004] However, the inventors have found that the existing method still has the following problems:

[0005] (1) When calculating the internal force of the plane truss, the internal force of the tower leg inclined member is calculated by using the section method, the node method, and the drawing method, and the calculation result is an approximate value.

[0006] (2) For the calculation of the internal force of the tower leg inclined member of the space truss structure, the existing technology only provides a method for calculating the internal force of the flat leg (i.e., the equal-length leg) tower, and does not provide a method for calculating the internal force of the long and short leg (i.e., the non-equal-length leg) tower, as shown in the following two figures. Figure 1 Figure 2 As shown in the following two figures.

[0007] In the transmission line engineering, the flat leg (equal-length leg) tower of the space truss structure can only be used in the relatively flat places in the plain or hilly areas. When the flat leg tower is used in the mountainous area, the tower leg often needs to be opened due to the slope of the mountain, which will cause damage to the vegetation and soil erosion at the tower foundation, and cannot meet the requirements of environmental protection for soil and water conservation, and the use of the flat leg (equal-length leg) tower in the mountainous area is limited.

[0008] ​In recent years, the requirements for environmental protection and water conservation in engineering are increasingly high. Based on the principle that the tower foundation in mountainous and hilly areas should not be opened or less opened, the design idea of long and short legged towers is gradually introduced in the industry, that is, the tower leg type is designed to match the terrain slope according to the actual topography of the tower foundation (i.e. long and short legged tower), which is used to meet the needs of the micro-topography of the tower foundation. Since the leg structure type of the long and short legged tower is an asymmetric structure, it is different from the calculation method when the flat leg (equal length leg) tower is stressed, so a new method is urgently needed to provide theoretical support for the effective monitoring of the internal force of the long and short legged tower, and targeted measures are taken in the analysis and optimization design of the tower leg. SUMMARY

[0009] In order to solve the above problems, the present disclosure provides a method and system for monitoring the internal force of the leg inclined material of a power transmission tower. Based on the scheme described in the present disclosure, not only the internal force of the leg inclined material of the flat leg (equal length leg) tower can be obtained, but also the internal force of the leg inclined material under a certain specific state when the long and short legs are combined. The internal force of the leg inclined material of the tower can be quickly and accurately monitored.

[0010] According to a first aspect of the embodiments of the present disclosure, a method for monitoring the internal force of the leg inclined material of a power transmission tower is provided, comprising:

[0011] Taking the ground contact position of the long and short legs of the power transmission tower as the center of the moment, the force arm of the long leg inclined material and the short leg inclined material is obtained respectively;

[0012] Obtaining the first wind load at the intersection position of the tower main material and the tower body inclined material, and the second wind load at the intersection position of the tower main material and the leg inclined material;

[0013] Based on the first wind load and the second wind load, the horizontal force acting on the leg separation surface is obtained;

[0014] Based on the principle of force balance, the internal force of the long leg and the short leg of the power transmission tower is obtained, and the monitoring of the internal force of the leg inclined material of the power transmission tower is realized according to the obtained internal force.

[0015] Further, the long and short leg inclined material force arms are obtained by taking the ground contact position of the long and short legs of the power transmission tower as the center of the moment, specifically: the drawing method is adopted, and the long and short leg inclined material force arms are obtained by manually measuring the long and short leg ground contact positions as the center of the moment.

[0016] Further, based on the first wind load and the second wind load, the horizontal force acting on the leg separation surface is obtained, specifically using the following formula:

[0017] P = (P1h1 + P2h2) / h2

[0018] Wherein, P1 is the first wind load, P2 is the second wind load, h1 is the distance between the main tower material extension line focus and the first horizontal plane, and h2 is the distance between the main tower material extension line focus and the second horizontal plane.

[0019] Further, the first horizontal plane is the horizontal plane where the main tower material and the tower body diagonal material focus; and the second horizontal plane is the horizontal plane where the main tower material and the leg diagonal material focus.

[0020] Further, based on the force balance principle, the diagonal material internal force of the long leg and the short leg of the power transmission tower is obtained, and the following formula is used:

[0021] The diagonal material internal force of the long leg of the tower is:

[0022] The diagonal material internal force of the short leg of the tower is:

[0023] Wherein, r1 is the long leg diagonal material force arm, r2 is the short leg diagonal material force arm, h3 is the distance from the short leg ground contact position to the tower leg separation surface, and h4 is the distance from the long leg ground contact position to the tower leg separation surface.

[0024] According to a second aspect of the embodiments of the present disclosure, a power transmission tower leg diagonal material internal force monitoring system is provided, comprising:

[0025] A force arm acquisition unit is configured to take the ground contact positions of the long leg and the short leg of the power transmission tower as the force moment center to respectively obtain the force arms of the long leg diagonal material and the short leg diagonal material;

[0026] A wind load acquisition unit is configured to obtain the first wind load at the intersection position of the main tower material and the tower body diagonal material, and the second wind load at the intersection position of the main tower material and the leg diagonal material;

[0027] A tower leg separation surface horizontal force acquisition unit is configured to obtain the horizontal force acting on the tower leg separation surface based on the first wind load and the second wind load;

[0028] A diagonal material internal force monitoring unit is configured to obtain the diagonal material internal force of the long leg and the short leg of the power transmission tower based on the force balance principle, and to realize the monitoring of the diagonal material internal force of the leg of the power transmission tower according to the obtained diagonal material internal force.

[0029] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, comprising a memory, a processor, and a computer program stored on the memory and running on the memory, and the processor executes the program to realize the power transmission tower leg diagonal material internal force monitoring method.

[0030] According to a fourth aspect of the embodiments of the present disclosure, a non-transitory computer-readable storage medium is provided, and the computer-readable storage medium has stored thereon a computer program, and the computer program is executed by a processor to implement the method for monitoring the internal force of the leg diagonal member of a power transmission tower.

[0031] Compared with the prior art, the beneficial effects of the present disclosure are:

[0032] (1) The present disclosure provides a method and system for monitoring the internal force of the leg diagonal member of a power transmission tower. Compared with the traditional calculation method which can only calculate the internal force of the leg diagonal member of a flat leg (equal length leg) tower, the scheme of the present disclosure can not only calculate the internal force of the leg diagonal member of a flat leg (equal length leg) tower, but also calculate the internal force of the leg diagonal member under a certain specific state when the long and short legs are combined. The calculation method is novel and solves the problem more comprehensively.

[0033] (2) The scheme of the present disclosure conforms to the balance principle of mechanical calculation and can solve the problem of the stress of the leg diagonal member of the tower leg under symmetric and asymmetric structures. The calculation result meets the engineering needs. The scheme is beneficial to the optimization of the leg diagonal member of the tower leg by the engineering and technical personnel, is beneficial to making a specific optimization scheme according to the actual situation, and makes the leg diagonal member reasonably stressed. The scheme fills the theoretical gap in the calculation of the internal force of the leg diagonal member of the long and short leg tower, enables the engineering and technical personnel to have a unified understanding, and promotes the views in the industry in this regard.

[0034] The advantages of the additional aspects of the present disclosure will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings accompanying the specification of the present disclosure serve to provide a further understanding of the present disclosure, and the illustrative embodiments of the present disclosure and their descriptions serve to explain the present disclosure, and do not constitute an improper limitation on the present disclosure.

[0036] Figure 1 The calculation diagram of the leg diagonal member of the flat leg (i.e. equal length leg) tower described in the embodiments of the present disclosure is shown in the following figure;

[0037] Figure 2 The calculation diagram of the leg diagonal member of the flat leg (i.e. non-equal length leg) tower described in the embodiments of the present disclosure is shown in the following figure;

[0038] Figure 3 The flowchart of the method for monitoring the internal force of the leg diagonal member of a power transmission tower described in the embodiments of the present disclosure is shown in the following figure. DETAILED DESCRIPTION

[0039] The present disclosure will be further described below in combination with the drawings and embodiments.

[0040] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in connection with the disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0042] The embodiments in the present disclosure and the features in the embodiments can be combined with each other in the case of no conflict.

[0043] Embodiment one:

[0044] The purpose of the present embodiment is to provide a method for monitoring the internal force of the leg diagonal member of a power transmission tower.

[0045] As shown in Figure 3 A method for monitoring the internal force of the leg diagonal member of a power transmission tower, comprising:

[0046] Taking the ground contact positions of the long and short legs of the power transmission tower as the centers of the moment of force, the force arms of the long leg diagonal member and the short leg diagonal member are obtained respectively;

[0047] Obtaining the first wind load at the intersection position of the tower main member and the tower diagonal member, and the second wind load at the intersection position of the tower main member and the leg diagonal member;

[0048] Based on the first wind load and the second wind load, the horizontal force acting on the leg separation surface is obtained;

[0049] Based on the principle of force balance, the internal force of the long leg diagonal member and the short leg diagonal member of the power transmission tower is obtained, and the monitoring of the internal force of the leg diagonal member of the power transmission tower is realized according to the obtained internal force.

[0050] Further, the long and short leg diagonal members are obtained by taking the ground contact positions of the long and short legs as the centers of the moment of force, and the force arms of the long and short leg diagonal members are obtained by manual measurement using the drawing method.

[0051] Further, the wind load is obtained by calculation through the formula provided by the national standard.

[0052] Further, based on the first wind load and the second wind load, the horizontal force acting on the leg separation surface is obtained, and the following formula is used:

[0053] P = (P1h1 + P2h2) / h2

[0054] Wherein, P1 is the first wind load, P2 is the second wind load, h1 is the distance between the focal point of the extension line of the main tower material and the first horizontal plane, and h2 is the distance between the focal point of the extension line of the main tower material and the second horizontal plane.

[0055] Furthermore, the first horizontal plane is the horizontal plane where the main tower member and the diagonal member of the tower body meet; the second horizontal plane is the horizontal plane where the main tower member and the diagonal member of the leg meet.

[0056] Furthermore, based on the principle of force balance, the internal forces of the inclined members of the long and short legs of the transmission tower are obtained using the following formula:

[0057] The internal forces of the diagonal members of the long leg of the iron tower are:

[0058] The internal forces of the diagonal members of the short leg of the iron tower are:

[0059] Where r1 is the lever arm of the long leg inclined member, r2 is the lever arm of the short leg inclined member, h3 is the distance from the short leg contact point to the tower leg partition, and h4 is the distance from the long leg contact point to the tower leg partition.

[0060] Specifically, for ease of understanding, the following detailed description of the solution in this embodiment, in conjunction with the accompanying drawings, will be provided from the perspective of specific implementation:

[0061] like Figure 1 The diagram shown illustrates the calculation of the diagonal members of the legs of a flat-leg (i.e., equal-length) iron tower. Figure 2 The diagram shows a calculation schematic for the diagonal bracing of the legs of a steel tower with legs of varying lengths (i.e., non-equal length legs); in the diagram:

[0062] r—the lever arm of the diagonal members S1 and S2 of the legs when the distance is taken with point O as the center of the moment, in meters;

[0063] r1, r2 — When calculating the long and short legs of the iron tower, the lever arm of the inclined member of the long and short legs is calculated with B1 and A3 as the moment points, in meters;

[0064] S1, S2 — Internal forces in the diagonal members of the legs of a flat-leg (equal-length) iron tower, in kN;

[0065] S3, S4 — Internal forces in the inclined members of the long and short legs of the iron tower, in kN;

[0066] P1, P2 — Horizontal external loads generated by strong winds acting on the intersection of the main and diagonal members of the tower, in kN;

[0067] h1, h2, h3, h4 — Dimensions of the tower in terms of vertical height, in meters (m).

[0068] Specifically, the embodiment provides a method for monitoring internal force of a leg diagonal member of a power transmission tower, which is suitable for internal force calculation of a leg diagonal member of all self-standing power transmission tower structures. The self-standing power transmission tower is a spatial truss structure, and the truss is composed of angle steels, steel pipes or composite materials, and the leg diagonal member is in a symmetrical or asymmetrical arrangement. The specific scheme comprises the following steps:

[0069] Step (1) determining the leg diagonal members S3 and S4 as the calculation objects; specifically, as shown in the drawing, the leg diagonal members S3 and S4 are taken as the calculation objects, and the positions are at the lowermost panel of the tower; Figure 2

[0070] Step (2) determining the horizontal force on the tower leg separation surface according to the wind load P1 and P2 at the intersection of the tower main member and the diagonal member; specifically, as shown in the drawing, the horizontal force acting on the tower leg separation surface is determined according to the wind load P1 and P2 at the intersection of the tower main member and the diagonal member according to the following formula: Figure 2

[0071] P = (P1h1 + P2h2) / h2

[0072] wherein P1 is the first wind load, P2 is the second wind load, h1 is the distance between the focal point of the tower main member extension line and the first horizontal plane, and h2 is the distance between the focal point of the tower main member extension line and the second horizontal plane.

[0073] Step (3) manually measuring the values of r1 and r2 of the long leg and the short leg by using the drawing method; specifically, as shown in the drawing, the drawing method is used to manually measure the force arm r1 and r2 of the long leg and the short leg diagonal member with B1 and A3 as the center of the moment; Figure 2

[0074] Step (4) calculating the internal force S3 and S4 of the long leg and the short leg diagonal member. Specifically, according to the principle of force balance, the internal force of the long leg and the short leg diagonal member of the tower is calculated as follows:

[0075] Internal force of the long leg diagonal member of the tower

[0076] Internal force of the short leg diagonal member of the tower

[0077] wherein r1 is the long leg diagonal member force arm, r2 is the short leg diagonal member force arm, h3 is the distance from the short leg ground contact position to the tower leg separation surface, and h4 is the distance from the long leg ground contact position to the tower leg separation surface.

[0078] Finally, the internal force of the long leg and the short leg diagonal member of the tower is monitored based on the obtained internal force of the diagonal member, and targeted measures are taken in the analysis and optimization design of the tower leg.

[0079] Embodiment two:

[0080] ​​​The embodiment aims to provide a transmission tower leg diagonal member internal force monitoring system.

[0081] The transmission tower leg diagonal member internal force monitoring system comprises:

[0082] A force arm acquisition unit is configured to obtain force arms of long-leg diagonal members and short-leg diagonal members respectively by taking the ground contact positions of the long and short legs of the transmission tower as the centers of the moments.

[0083] A wind load acquisition unit is configured to acquire a first wind load at the intersection position of the tower main member and the tower body diagonal member, and a second wind load at the intersection position of the tower main member and the leg diagonal member.

[0084] A tower leg separation surface horizontal force acquisition unit is configured to obtain the horizontal force acting on the tower leg separation surface based on the first wind load and the second wind load.

[0085] A diagonal member internal force monitoring unit is configured to obtain the internal forces of the long-leg and short-leg diagonal members of the transmission tower based on the force balance principle, and to realize the monitoring of the internal forces of the leg diagonal members of the transmission tower according to the obtained internal forces.

[0086] Specifically, the system of the embodiment corresponds to the method of the first embodiment, and the technical details have been described in the first embodiment, which will not be described here.

[0087] In more embodiments, there are also provided:

[0088] An electronic device comprises a memory and a processor, and computer instructions stored in the memory and running on the processor, and when the computer instructions are run by the processor, the method described in the first embodiment is completed. For the sake of brevity, it will not be described here.

[0089] It should be understood that in the embodiment, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, ready-to-program gate arrays FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0090] The memory can include read-only memory and random access memory, and provide instructions and data to the processor, and a part of the memory can also include non-volatile random access memory. For example, the memory can also store device type information.

[0091] A computer readable storage medium is configured to store computer instructions, and when the computer instructions are executed by the processor, the method described in the first embodiment is completed.

[0092] The method in the embodiment one can be directly embodied as being completed by a hardware processor or being completed by a combination of hardware and software modules in the processor. The software modules can be located in a storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, or the like. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware to complete the steps of the above method. To avoid repetition, no further detailed description is given here.

[0093] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software mode depends on the specific application and design constraints of the technical solutions. A person skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present disclosure.

[0094] The power transmission tower leg diagonal member internal force monitoring method and system provided by the above embodiments can be realized and have a broad application prospect.

[0095] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for monitoring the internal forces of the diagonal members in the legs of a power transmission tower, characterized in that, include: Using the contact points between the long and short legs of the transmission tower and the ground as the center of torque, the lever arms of the long leg inclined members and the short leg inclined members are obtained respectively. Obtain the first wind load at the intersection of the main tower member and the diagonal member of the tower body, and the second wind load at the intersection of the main tower member and the diagonal member of the leg. Based on the first and second wind loads, the horizontal force acting on the tower leg diaphragm is obtained using the following formula: in, P 1 represents the first wind load. P 2 represents the second wind load. h 1 represents the distance between the focal point of the extended line of the main structure of the iron tower and the first horizontal plane. h 2 represents the distance between the focal point of the extended line of the main tower material and the second horizontal plane; The first horizontal plane is the horizontal plane where the main member of the tower and the diagonal member of the tower body are located; the second horizontal plane is the horizontal plane where the main member of the tower and the diagonal member of the leg are located. Based on the principle of force balance, the internal forces of the inclined members of the long and short legs of the transmission tower are obtained, and the internal forces of the inclined members of the transmission tower legs are monitored based on the obtained internal forces of the inclined members. The internal forces of the inclined members of the long and short legs of the transmission tower, based on the principle of force balance, are obtained using the following formula: The internal forces of the diagonal members of the long leg of the iron tower are: ; The internal forces of the diagonal members of the short leg of the iron tower are: ; in, r 1 is a long-legged diagonal lever arm. r 2 is a short-legged diagonal lever arm. h 3 represents the distance from the short leg's contact point to the tower leg's partition surface. h 4 represents the distance from the point where the long leg touches the ground to the surface of the tower leg.

2. The method for monitoring the internal force of the diagonal members in the legs of a power transmission tower as described in claim 1, characterized in that, The method of obtaining the lever arms of the long and short leg inclined members by taking the contact position of the long and short legs of the transmission tower with the ground as the torque center is as follows: using a drawing method, the lever arms of the long and short leg inclined members are obtained by manual measurement with the contact position of the long leg and the contact position of the short leg as the torque center.

3. A monitoring system for the internal forces of the diagonal members in the legs of a power transmission tower, characterized in that, include: The lever arm acquisition unit is used to obtain the lever arm of the long leg inclined member and the short leg inclined member respectively, with the contact position between the long and short legs of the transmission tower and the ground as the torque center. The wind load acquisition unit is used to acquire the first wind load at the intersection of the main tower member and the diagonal member of the tower body, and the second wind load at the intersection of the main tower member and the diagonal member of the leg. The tower leg partition horizontal force acquisition unit is used to obtain the horizontal force acting on the tower leg partition based on the first wind load and the second wind load, specifically using the following formula: in, P 1 represents the first wind load. P 2 represents the second wind load. h 1 represents the distance between the focal point of the extended line of the main structure of the iron tower and the first horizontal plane. h 2 represents the distance between the focal point of the extended line of the main tower material and the second horizontal plane; The first horizontal plane is the horizontal plane where the main member of the tower and the diagonal member of the tower body are located; the second horizontal plane is the horizontal plane where the main member of the tower and the diagonal member of the leg are located. The inclined member internal force monitoring unit is used to obtain the inclined member internal force of the long and short legs of the transmission tower based on the principle of force balance, and to monitor the inclined member internal force of the transmission tower legs based on the obtained inclined member internal force. The internal forces of the inclined members of the long and short legs of the transmission tower, based on the principle of force balance, are obtained using the following formula: The internal forces of the diagonal members of the long leg of the iron tower are: ; The internal forces of the diagonal members of the short leg of the iron tower are: ; in, r 1 is a long-legged diagonal lever arm. r 2 is a short-legged diagonal lever arm. h 3 represents the distance from the short leg's contact point to the tower leg's partition surface. h 4 represents the distance from the point where the long leg touches the ground to the surface of the tower leg.

4. The monitoring system for the internal force of the inclined members of the legs of a power transmission tower as described in claim 3, characterized in that, The method of obtaining the lever arms of the long and short leg inclined members by taking the contact position of the long and short legs of the transmission tower with the ground as the torque center is as follows: using a drawing method, the lever arms of the long and short leg inclined members are obtained by manual measurement with the contact position of the long leg and the contact position of the short leg as the torque center.

5. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and running thereon, characterized in that, When the processor executes the program, it implements a method for monitoring the internal force of the inclined members of the legs of a power transmission tower as described in claims 1-2.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements a method for monitoring the internal forces of the inclined members of the legs of a power transmission tower as described in any one of claims 1-2.

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