Method and system for calculating water flow force of inclined column bearing platform pile of power transmission line

Abstract

The invention provides a power transmission line inclined column bearing platform pile water flow force calculation method and system, load applied by an iron tower upper structure is calculated, and power transmission tower leg main material transmission load borne by a foundation is obtained through calculation; respectively calculating the load of the water flow force on the foundation batter post, the load of the water flow force on the pile cap and the load of the water flow force on the cast-in-place pile, and calculating to obtain the water flow wave force load; calculating an accidental load; and the transmission tower leg main material transmission load borne by the foundation, the water flow wave force load and the accidental load are synthesized, and the water flow force of the inclined column bearing platform pile of the power transmission line is obtained. By calculating the load change of the foundation under the action of the foundation acting force and the water flow force, the length of the inclined column of the foundation and the cantilever length of the cast-in-place pile are optimally designed, the unbalanced design is greatly reduced, and the comprehensive manufacturing cost of the inclined column bearing platform pile foundation is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of data calculation and analysis, and in particular relates to a method and system for calculating water flow force of inclined column cap piles of power transmission lines. Background Art

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

[0003] Part of the tower base of the transmission line needs to be erected on the soft foundation of the riverbed. Due to the large foundation force of the long-span tower, the scouring load from the river and the impact load of floating objects must also be considered. The cost of traditional pile cap foundation projects is often high. The main column length and pile length design often cause the phenomenon of light top and heavy foot or heavy top and light foot due to unreasonable length design. Therefore, it is necessary to take into account the overall foundation and design the river channel inclined column cap pile foundation. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a method and system for calculating the water flow force of inclined column cap piles of power transmission lines. The present invention optimizes the design of the inclined column length of the foundation and the cantilever length of the cast-in-place pile by calculating the foundation force and the load change of the foundation under the action of water flow force, thereby greatly reducing the unbalanced design and reducing the comprehensive cost of the inclined column cap pile foundation.

[0005] According to some embodiments, the present invention adopts the following technical solutions:

[0006] A method for calculating the water flow force of inclined column cap piles of a transmission line comprises the following steps:

[0007] Calculate the load imposed by the tower superstructure and calculate the load transferred by the main material of the tower leg of the transmission tower.

[0008] Calculate the load of water flow force on the foundation inclined column, the load of water flow force on the pile cap, and the load of water flow force on the cast-in-place pile respectively, and calculate the water flow wave force load;

[0009] Calculation of accidental loads;

[0010] The water flow force of the inclined column cap pile of the transmission line is obtained by comprehensively considering that the foundation bears the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load.

[0011] As an optional implementation, the transmission line inclined column cap piles include a transmission tower leg main material, a foundation inclined column, a pile cap and a cast-in-place pile, a plurality of cast-in-place piles are arranged below the pile cap, a foundation inclined column is obliquely arranged above the pile cap, the transmission tower leg main material foundation is buried in the foundation inclined column, and the inclinations of the two are consistent.

[0012] As an optional implementation, when calculating the load applied by the tower superstructure, the load applied by the tower superstructure is decomposed into three directions: x, y, and z, and calculated separately.

[0013] As an optional implementation, the process of calculating the load of water flow force on the foundation inclined column, the load of water flow force on the pile cap, and the load of water flow force on the cast-in-place pile includes: F = p x AK; where p x is the average of the water pressure in the corresponding part, A is the area of ​​the water flow surface, and K is the basic shape coefficient, where the square section is 1.5 and the circular section is 0.8.

[0014] As a further step, during the calculation, the maximum water surface pressure Where g is the acceleration due to gravity, V0 is the vertical average flow velocity, and γ is the density of water.

[0015] As a further step, in the process of calculating the water flow force on the pile cap, the maximum pressure p on the top surface of the pile cap is b and the maximum pressure p on the bottom of the pile cap c The mean water pressure of the pile cap is calculated based on the inverted triangle water depth interpolation.

[0016] As a further implementation method, the inverted triangle water flow pressure and water depth are obtained by conducting field surveys.

[0017] As an optional embodiment, the accidental load is the impact load of floating objects on the foundation.

[0018] As an optional embodiment, the impact load is Where W is the gravity of the floating object, T is the impact time, and V0 is the vertical average flow velocity.

[0019] As an optional implementation, when the foundation is subjected to the load transferred by the main material of the transmission tower legs, the water wave force load and the accidental load, the water flow force direction angle is combined with the foundation force, wherein the water flow force and the floating object impact load are combined with the foundation force according to the variable live load.

[0020] A transmission line inclined column cap pile water flow force calculation system, comprising:

[0021] The first calculation module is configured to calculate the load applied by the upper structure of the tower, and calculate the load transferred by the main material of the tower leg of the transmission tower borne by the foundation;

[0022] The second calculation module is configured to respectively calculate the load of the water flow force on the foundation inclined column, the load of the water flow force on the pile cap, and the load of the water flow force on the cast-in-place pile, and calculate the water flow wave force load;

[0023] a third calculation module configured to calculate accidental loads;

[0024] The comprehensive calculation module is configured to comprehensively calculate the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load borne by the foundation to obtain the water flow force of the inclined column cap pile of the transmission line.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention can comprehensively calculate the foundation force and the load change of the foundation under the action of water flow force, thereby optimizing the design of the foundation inclined column length and the cantilever length of the cast-in-place pile, greatly reducing the unbalanced design and reducing the comprehensive cost of the inclined column cap pile foundation.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 A schematic diagram of a transmission line inclined column cap pile foundation structure according to an embodiment;

[0030] Figure 2 The figure is a force decomposition diagram of a pile cap according to an embodiment.

[0031] Among them, 1. Main materials of transmission tower legs, 2. Foundation inclined columns, 3. Pile caps, 4. Cast-in-place piles. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0036] Embodiment 1

[0037] like Figure 1 As shown, a transmission line inclined column cap pile foundation comprises a transmission tower leg main material 1, a foundation inclined column 2, a pile cap 3 and cast-in-place piles 4, wherein cast-in-place piles 4 are arranged below the pile cap 3, and a foundation inclined column 2 is obliquely arranged above the pile cap 3, and the transmission tower leg main material foundation 1 is buried in the foundation inclined column 2, and the inclinations of the two are consistent.

[0038] The above-mentioned method for calculating the water flow force of the inclined column cap pile of the power transmission line comprises the following steps:

[0039] Step (1) calculating the load applied by the tower superstructure, and calculating the load transferred by the main material of the tower leg of the transmission tower borne by the foundation;

[0040] Step (2) respectively calculates the load of water flow force on the foundation inclined column, the load of water flow force on the pile cap, and the load of water flow force on the cast-in-place pile, and calculates the water flow wave force load;

[0041] Step (3) Calculate accidental loads;

[0042] Step (4) comprehensively considers the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load borne by the foundation to obtain the water flow force of the inclined column cap pile of the transmission line.

[0043] In this embodiment, in step (1), when calculating the load applied by the tower superstructure, the load applied by the tower superstructure is decomposed into three directions, namely, x, y and z, and calculated separately.

[0044] When calculating the tower superstructure, the basic forces in the X`, Y`, and Z` directions in the overall coordinate system will be generated to act on the top surface of the inclined column. The overall coordinate system is related to the direction of the tower, where X` is the direction parallel to the crossarm, Y` is the direction perpendicular to the crossarm, and Z` is the plumb bob direction. XYZ is the local coordinate axis of the main column, Z is the extension direction of the inclined column, and XY is the vertical direction of the section of the component. The angle between the XY axis projection on the horizontal plane and the overall coordinate system is as follows: Figure 2 As shown. The rotation angle θ of the cap is generally 45°, and the X-horizontal projection direction points to the center pile of the tower. Ψ is the angle between the Z axis and the Z' axis. The local decomposition of the force at this time is as follows:

[0045] Fz=Fz`*cosΨ+Fx`*sinΨ+Fy`*sinΨ;

[0046] Fx=Fz`*sinΨcosθ+Fx`*cosΨcosθ-Fy`*cosΨsinθ;

[0047] Fy=Fz`*sinΨsinθ+Fx`*cosΨsinθ+Fy`*cosΨcosθ.

[0048] In this embodiment, in step (2), the process of calculating the load of the water flow force on the foundation inclined column, the load of the water flow force on the pile cap, and the load of the water flow force on the cast-in-place pile includes: F = p x AK; where p x is the average of the water pressure in the corresponding part, A is the area of ​​the water flow surface, and K is the basic shape coefficient, where the square section is 1.5 and the circular section is 0.8.

[0049] During the calculation process, the maximum water surface pressure Where g is the acceleration due to gravity, V0 is the vertical average flow velocity, and γ is the density of water.

[0050] In the process of calculating the water flow force on the pile cap, the maximum pressure p on the top surface of the pile cap is b and the maximum pressure p on the bottom of the pile cap c The mean water pressure of the pile cap is calculated based on the inverted triangle water depth interpolation.

[0051] In this embodiment, the data of the vertical average flow velocity V0 and the inverted triangle water depth H can be given according to the hydrological report. The flow velocity of water at different water depths is different. The greater the maximum flow velocity at the water surface, the corresponding pressure decreases with the depth of the water. When the depth reaches H, the water flow velocity is 0 and the pressure is also zero. The pressure at the water surface can be measured by It is calculated that at depth H, the water pressure is 0, and the pressure in the middle varies linearly with depth. Therefore, the pressure at the corresponding depth can be calculated by interpolating similar triangles at a known depth. The average pressure in a certain interval is the average of the maximum and minimum pressures within the depth range.

[0052] The pressure and depth of the inverted triangle flow are obtained through field survey.

[0053] In this embodiment, the accidental load in step (3) is the impact load of floating objects on the foundation.

[0054] The impact load is Where W is the gravity of the floating object, T is the impact time, and V0 is the vertical average flow velocity.

[0055] Floating objects generally include ice floes, trees destroyed by floods and other debris. During the design, the types and sizes of possible floating objects are judged based on the actual situation of the river, and the funds are raised to calculate the gravity based on the size.

[0056] In step (4), when the foundation is subjected to the load transferred by the main material of the transmission tower leg, the water wave force load and the accidental load, the water flow force direction angle and the foundation force are combined, wherein the water flow force and the floating object impact load are combined with the foundation force according to the variable live load.

[0057] Embodiment 2

[0058] A transmission line inclined column cap pile water flow force calculation system, comprising:

[0059] The first calculation module is configured to calculate the load applied by the upper structure of the tower, and calculate the load transferred by the main material of the tower leg of the transmission tower borne by the foundation;

[0060] The second calculation module is configured to respectively calculate the load of the water flow force on the foundation inclined column, the load of the water flow force on the pile cap, and the load of the water flow force on the cast-in-place pile, and calculate the water flow wave force load;

[0061] a third calculation module configured to calculate accidental loads;

[0062] The comprehensive calculation module is configured to comprehensively calculate the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load borne by the foundation to obtain the water flow force of the inclined column cap pile of the transmission line.

[0063] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0064] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0065] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0066] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. A method for calculating the water flow force of inclined column cap piles of power transmission lines, characterized in that: The following steps are involved: Calculate the load imposed by the tower superstructure and calculate the load transferred by the main material of the tower leg of the transmission tower. Calculate the load of water flow force on the foundation inclined column, the load of water flow force on the pile cap, and the load of water flow force on the cast-in-place pile respectively, and calculate the water flow wave force load; Calculation of accidental loads; The water flow force of the inclined column cap pile of the transmission line is obtained by comprehensively considering that the foundation bears the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load.

2. A method for calculating the water flow force of inclined column cap piles of power transmission lines as claimed in claim 1, characterized in that: The transmission line inclined column cap piles include a transmission tower leg main material, a foundation inclined column, a pile cap and cast-in-place piles. A plurality of cast-in-place piles are arranged below the pile cap, and a foundation inclined column is arranged obliquely above the pile cap. The transmission tower leg main material foundation is buried in the foundation inclined column, and the inclinations of the two are consistent.

3. A method for calculating the water flow force of inclined column cap piles of power transmission lines as claimed in claim 1, characterized in that: When calculating the load applied by the tower superstructure, the load applied by the tower superstructure is decomposed into three directions: x, y, and z and calculated separately.

4. A method for calculating the water flow force of inclined column cap piles of a power transmission line as claimed in claim 1, characterized in that: The process of calculating the load of water flow force on the foundation inclined column, the load of water flow force on the pile cap, and the load of water flow force on the cast-in-place pile includes: F = p x AK; where p x is the average of the water pressure in the corresponding part, A is the area of ​​the water flow surface, and K is the basic shape coefficient.

5. A method for calculating the water flow force of inclined column cap piles of power transmission lines as claimed in claim 4, characterized in that: During the calculation process, the maximum water surface pressure Where g is the acceleration due to gravity, V0 is the vertical average flow velocity, and γ is the density of water.

6. A method for calculating water flow force of inclined column cap piles of power transmission lines as claimed in claim 4, characterized in that: In the process of calculating the load of water flow force on the pile cap, the maximum pressure p on the top surface of the pile cap is b and the maximum pressure p on the bottom of the pile cap c The mean water pressure of the pile cap is calculated based on the inverted triangle water depth interpolation.

7. A method for calculating water flow force of inclined column cap piles of power transmission lines as claimed in claim 6, characterized in that: The pressure and depth of the inverted triangle flow are obtained through field survey.

8. A method for calculating water flow force of inclined column cap piles of power transmission lines as claimed in claim 1, characterized in that: The accidental load is the impact load of floating objects on the foundation; The impact load is Where W is the gravity of the floating object, T is the impact time, and V0 is the vertical average flow velocity.

9. A method for calculating the water flow force of inclined column cap piles of power transmission lines as claimed in claim 1, characterized in that: When the foundation bears the load transferred by the main material of the transmission tower leg, the water wave force load and the accidental load, it is combined with the foundation force according to the angle of the water flow force direction, among which the water flow force and the floating object impact load are combined with the foundation force according to the variable live load.

10. A system for calculating the water flow force of inclined column cap piles of power transmission lines, characterized in that: include: The first calculation module is configured to calculate the load applied by the upper structure of the tower, and calculate the load transferred by the main material of the tower leg of the transmission tower borne by the foundation; The second calculation module is configured to respectively calculate the load of the water flow force on the foundation inclined column, the load of the water flow force on the pile cap, and the load of the water flow force on the cast-in-place pile, and calculate the water flow wave force load; a third calculation module configured to calculate accidental loads; The comprehensive calculation module is configured to comprehensively calculate the load transferred by the main material of the transmission tower leg, the water flow wave force load and the accidental load borne by the foundation to obtain the water flow force of the inclined column cap pile of the transmission line.

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