Power transmission line deep well rotary excavating pile foundation well wall overhanging type grounding method and device

Abstract

The invention relates to the technical field of power transmission line tower grounding, in particular to a power transmission line deep well rotary excavating pile foundation well wall overhanging type grounding method and device. The method comprises the steps that the pile foundation position is determined, a construction operation area is cleaned, and normal construction is ensured; according to drawing requirements, line planning and soil property data, a drilling site is selected and marked; the reinforcement cage is hoisted into the pile foundation deep well through a crane, and concrete is poured into the reinforcement cage; digging a receiving trench according to the receiving trench path plan; installing and constructing a power transmission line tower; the tower is checked; the method can obviously change the correlation rule of the deep well digging pile foundation in the vertical dimension, enables the current to be more uniformly distributed around the pile foundation, effectively reduces the grounding resistance of a tower, guarantees the safety of a power transmission line, and does not need to excavate the land in a large area to arrange a grounding grid and arrange a grounding device on the well wall of the pile foundation like a traditional mode. Occupation and damage to cultivated land are greatly reduced, the ecological environment of the farmland is protected, and sustainable development of agriculture is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line tower grounding, and in particular to a method and device for grounding a transmission line deep well rotary pile foundation well wall suspended grounding. Background Art

[0002] The tower grounding grid is the most basic lightning protection facility for transmission lines, and effectively reducing the grounding resistance of the tower grounding grid is the key to reducing overvoltage on the top of the tower and preventing surface flashover of insulators due to back-strike. Long-term operating experience shows that traditional grounding devices mostly use metal materials, such as round steel, flat steel, etc. These materials will be corroded by moisture, salt and other chemicals in the soil when buried in the soil for a long time, resulting in corrosion. This corrosion will not only reduce the conductivity of the grounding body, causing the grounding resistance to gradually increase, but may also weaken the mechanical strength of the grounding body and affect its long-term stability. Summary of the invention

[0003] The invention provides a method and device for suspended grounding of a shaft wall of a deep well rotary pile foundation of a power transmission line, which can overcome certain or some defects of the prior art.

[0004] A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to the present invention comprises: S1. Determine the location of the pile foundation, clear the construction area, and ensure the normal progress of the construction; S2. Select and mark the drilling location according to the drawing requirements, line planning and soil data; S3, using a crane to hoist the pre-bound steel cage into the deep well of the pile foundation, and pouring concrete into it; S4. Dig a grounding trench according to the grounding trench line planning; S5. Use cranes to install and construct transmission line towers; S6. Check the quality of the tower, grounding resistance and current dispersion characteristics of the artificial grounding body.

[0005] Preferably, the specific position of the pile foundation is determined using measuring instruments suitable for engineering use, including a locator, a steel measuring tape, a tower ruler and a level ruler.

[0006] Preferably, the reinforcement cage is prepared according to the preparation method and the set number of reinforcement bars specified in the construction design.

[0007] Preferably, the concrete is stirred during the pouring process, the anchor bolts are suspended on the top of the pile foundation by using a support frame, and the horizontal and vertical positions of the anchor bolt cage are ensured by a level meter.

[0008] Preferably, the top of the pile foundation is 20 cm above the ground.

[0009] Preferably, the resistance of the tower is reduced by digging a grounding trench and burying an artificial grounding body, and the depth of the grounding trench is not less than 60 cm.

[0010] Preferably, in areas with low soil resistivity and when the grounding resistance meets the requirements, a frame-shaped grounding grid is used as the artificial grounding body of the transmission line; in areas with high soil resistivity and when the grounding resistance cannot meet the needs of safe operation of the tower, a frame-shaped grounding grid with extended rays is used as the artificial grounding body of the tower.

[0011] Preferably, during the hoisting process, the crane and the boom remain relatively still, allowing the steel cage to slowly and vertically sink into the deep well of the pile foundation.

[0012] A transmission line deep well rotary pile foundation shaft wall suspended grounding device according to the present invention comprises: a flexible graphite composite grounding material and a steel cage.

[0013] Preferably, the flexible graphite composite grounding material is a cable-like or planar structure with a thickness of only 4 mm to 5 mm.

[0014] The method and device for suspended grounding of deep well rotary pile foundation of power transmission line of the present invention have the following technical effects: 1. The well wall suspended grounding method is adopted to significantly change the dispersion structure and current density distribution law of deep well excavation pile foundation in the vertical dimension, so that the current is more evenly distributed around the pile foundation and the dispersion effect is improved; 2. By changing the scattered current structure and current density distribution, the grounding resistance of the tower can be effectively reduced; 3. There is no need to excavate large areas of land, which reduces the occupation and damage of arable land and reduces the impact of construction on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A steel cage structure diagram of a method and device for suspended grounding of a deep shaft rotary pile foundation for a power transmission line; Figure 2 A top view of a steel cage of a method and device for suspended grounding of a shaft wall of a deep shaft rotary bored pile foundation for a power transmission line. DETAILED DESCRIPTION

[0016] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0017] Example 1 like Figure 1-2 As shown, this embodiment provides a method for suspended grounding of the shaft wall of a deep well rotary pile foundation of a power transmission line.

[0018] See Figure 1, a method for suspended grounding of a deep well rotary pile foundation of a power transmission line in this embodiment includes: S1. Determine the location of the pile foundation, clear the construction area, and ensure the normal progress of the construction; S2. Select and mark the drilling location according to the drawing requirements, line planning and soil data; S3, using a crane to hoist the pre-bound steel cage into the deep well of the pile foundation, and pouring concrete into it; S4. Dig a grounding trench according to the grounding trench line planning; S5. Use cranes to install and construct transmission line towers; S6. Check the quality of the tower, grounding resistance and current dispersion characteristics of the artificial grounding body.

[0019] Among them, measuring instruments suitable for engineering use, including locators, steel tape measures, tower rulers and spirit levels, are used to determine the specific location of the pile foundation.

[0020] Among them, the steel cage is prepared according to the preparation method specified in the construction design and the set number of steel bars.

[0021] During the pouring process, the concrete is stirred, the anchor bolts are suspended on the top of the pile foundation using a support frame, and the horizontal and vertical positions of the anchor bolt cage are ensured by a level meter.

[0022] Among them, the top of the pile foundation is 20cm above the ground.

[0023] Among them, the resistance of the tower is reduced by digging a grounding trench and burying an artificial grounding body, and the depth of the grounding trench is not less than 60cm.

[0024] Among them, in areas with low soil resistivity, when the grounding resistance meets the requirements, a frame-shaped grounding grid is used as the artificial grounding body of the transmission line; in areas with high soil resistivity, when the grounding resistance cannot meet the needs of safe operation of the tower, a frame-shaped grounding grid with extension rays is used as the artificial grounding body of the tower.

[0025] During the lifting process, the crane and the boom remain relatively still, allowing the steel cage to slowly and vertically sink into the deep well of the pile foundation.

[0026] This embodiment can significantly change the relevant laws of deep well excavation pile foundation in the vertical dimension, so that the current is more evenly distributed around the pile foundation, effectively reducing the grounding resistance of the tower and ensuring the safety of the transmission line. At the same time, there is no need to excavate a large area of ​​land to arrange the grounding grid as in the traditional way. The grounding device is set on the wall of the pile foundation, which greatly reduces the occupation and damage of cultivated land, protects the ecological environment of farmland, and promotes the sustainable development of agriculture.

[0027] Example 2 See Figure 2 , a transmission line deep well rotary pile foundation shaft wall suspended grounding device of this embodiment includes: a flexible graphite composite grounding material and a steel cage.

[0028] Among them, the flexible graphite composite grounding material is a cable-like or surface-like structure with a thickness of only 4mm-5mm.

[0029] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0030] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line, comprising: S1. Determine the location of the pile foundation, clear the construction area, and ensure the normal progress of the construction; S2. Select and mark the drilling location according to the drawing requirements, line planning and soil data; S3, using a crane to hoist the pre-bound steel cage into the deep well of the pile foundation, and pouring concrete into it; S4. Dig a grounding trench according to the grounding trench line planning; S5. Use cranes to install and construct transmission line towers; S6. Check the quality of the tower, grounding resistance and current dispersion characteristics of the artificial grounding body.

2. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: Use surveying instruments suitable for the project, including locators, steel tape measures, tower rulers and spirit levels, to determine the exact location of the pile foundation.

3. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: Prepare the steel cage according to the preparation method specified in the construction design and the set number of steel bars.

4. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: During the pouring process, the concrete is mixed, and the anchor bolts are suspended on the top of the pile foundation using a support frame, and the horizontal and vertical positions of the anchor bolt cage are ensured by a level meter.

5. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: The top of the pile foundation is 20cm above the ground.

6. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: The resistance of the tower is reduced by digging a grounding trench and burying an artificial grounding body. The depth of the grounding trench should not be less than 60cm.

7. A method for suspended grounding of a deep well rotary pile foundation for a power transmission line according to claim 1, wherein: In areas with low soil resistivity and when the grounding resistance meets the requirements, a frame-shaped grounding grid is used as the artificial grounding body of the transmission line; in areas with high soil resistivity and when the grounding resistance cannot meet the needs of safe operation of the tower, a frame-shaped grounding grid with extension rays is used as the artificial grounding body of the tower.

8. A method for suspended grounding of a deep well rotary pile foundation of a power transmission line according to claim 1, wherein: During the lifting process, the crane and the boom remain relatively still, allowing the steel cage to slowly and vertically sink into the deep well of the pile foundation.

9. A deep well rotary pile foundation well wall suspended grounding device for a power transmission line, comprising: Flexible graphite composite grounding material and steel cage.

10. A transmission line deep well rotary pile foundation shaft wall suspended grounding device according to claim 9, wherein: Flexible graphite composite grounding material has a cable-like or surface-like structure with a thickness of only 4mm-5mm.

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