Grounding rod installation method

Abstract

We propose a method for installing grounding rods that allows for installation even on bedrock in mountainous areas. [Solution] The boring device forms a borehole 27 by rotating a core tube connected to a rod and drilling through it. The winch 3 can pull up the rod by pulling a wire suspended on a pulley 7. Next, an earth rod 37 is inserted into the borehole 27. The winch 3 can suspend the earth rod 37 by the wire suspended on the pulley 7. The earth rod 37 is made up of multiple earth rod components connected together while suspended by the winch 3. Next, a grounding resistance reducing agent is injected into the gap between the earth rod 37 and the borehole 27. The earth rod 37 is buried with a buried ground wire attached.

Description

Technical Field

[0001] The present invention relates to a method for installing an earth rod, and more particularly to a method for installing an earth rod in a boring hole formed by a boring device.

Background Art

[0002] The applicant has proposed a boring device described in Patent Document 1. By making the parts detachable, each part has a weight that can be carried on a person's shoulder, making it easy to carry in and out of mountainous areas. Furthermore, it can have sufficient excavation ability even in narrow areas.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when installing a steel tower or the like in a deep mountainous area, an earth connection is also required. At this time, if the ground is hard rock, manual excavation along the ground surface is impossible, so it is not possible to bury an earth wire. Therefore, it is necessary to install an earth rod in the vertical direction. However, with a general boring device, it is difficult in terms of cost and construction period to carry materials into a deep mountainous area. Therefore, it is practically difficult to form a vertical hole in hard rock, and it has been difficult to install an earth rod.

[0005] Therefore, an object of the present invention is to propose a method for installing an earth rod that can install an earth rod even in a steel tower standing on the rock of a deep mountainous area.

Means for Solving the Problems

[0006] A first aspect of the present invention is a method for installing an earth rod in a borehole formed by a boring device, comprising: a borehole forming step of forming a borehole by drilling the ground with a boring device; an earth rod installation step of inserting an earth rod into the borehole; a reducing agent injection step of injecting a ground resistance reducing agent into the gap between the earth rod and the borehole; and a buried ground wire attachment step of attaching a buried ground wire to the earth rod and burying it, wherein in the borehole forming step, the boring device is connected to a rod The boring hole is formed by rotating the rod and drilling, a wire is suspended from a pulley located above the boring device, one end of the wire is connected to a winch and the other end is connected to the rod, the winch can pull up the rod by pulling the wire, in the grounding rod installation step, one end of the wire is connected to the winch and the other end is connected to the grounding rod component, the grounding rod is formed by connecting other grounding rod components to the grounding rod component which is suspended by the winch.

[0007] A second aspect of the present invention is a method for installing an earthing rod according to the first aspect, wherein in the reducing agent injection step, the earthing resistance reducing agent is filled into the gap between the earthing rod and the borehole from the back using a cylindrical injection tool.

[0008] A third aspect of the present invention is a method for installing an earthing rod according to the first or second aspect, wherein in the boring hole forming step, cementation is applied to the wall of the boring hole, and in the reducing agent injection step, the earthing resistance reducing agent does not flow out of the cemented boring hole. [Effects of the Invention]

[0009] According to various aspects of the present invention, a small boring device, such as the boring device described in Patent Document 1, can be used to form boreholes even in hard bedrock. Furthermore, by using a pulley and a specially made holder used to pull up the rod with the boring device to suspend and grip the grounding rod, it is possible to easily install a grounding rod even in mountainous areas. In addition, the grounding rod components can be connected while the grounding rod is suspended.

[0010] Furthermore, according to a second aspect of the present invention, a cylindrical injection tool can be used to fill the gap between the grounding rod and the borehole with a grounding resistance reducing agent without any gaps, starting from the back.

[0011] Furthermore, according to a third aspect of the present invention, by performing cementation on the borehole, it is possible to prevent the injected grounding resistance reducing agent from flowing out. [Brief explanation of the drawing]

[0012] [Figure 1] This figure shows the boring device in the example installed on the ground. [Figure 2] (a) is a diagram showing the process of drilling a borehole using a boring device, and (b) is a diagram showing the state after drilling to a desired depth. [Figure 3] (a) is a diagram showing the state after repeated excavation and slime removal, resulting in a deeper excavation than in Figure 2, and (b) is a diagram showing the state after repeated excavation and slime removal, resulting in an even deeper excavation. [Figure 4] (a) is a diagram showing the state after excavating to a predetermined depth (e.g., 20m) and repeating the process of excavation and slime removal, and (b) is a diagram showing the state after excavating to a predetermined depth by repeating the process of excavation and slime removal. [Figure 5] This is a diagram illustrating the step of inserting the grounding rod. [Figure 6] This figure shows the grounding rod 37 inserted into the borehole 27. [Figure 7]FIG. 1 is for explaining the step of injecting a ground resistance reducing agent. [Figure 8] FIG. 2 is for explaining the step of injecting a ground resistance reducing agent. [Figure 9] The figure is for explaining the step of attaching the buried ground wire 51.

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to this embodiment.

Embodiment

[0014] FIGS. 1 to 9 are diagrams for explaining a ground rod installation method according to the present invention.

[0015] FIGS. 1 to 4 are for explaining the step of creating a boring hole (vertical hole) using a boring device.

[0016] Conventionally, it has been difficult to provide a vertical hole in the hard bedrock of deep mountainous areas. It is impossible to manually provide a vertical hole in hard bedrock. A boring device capable of providing a vertical hole in hard bedrock is large-sized and difficult to carry into mountainous areas.

[0017] FIG. 1 shows a state where the boring device in this embodiment is installed on the ground. This boring device is, for example, the one described in Patent Document 1.

[0018] First, fix the base to the ground with an anchor. Attach a vertical lifting frame to the base detachably. Attach a downward electric core drill 11 to the lifting frame so that it can be lifted and lowered and detached. The electric core drill 11 includes a pressurizing lever for lowering.

[0019] Connect a rod 13 to the rotating part of the electric core drill 11 detachably through a rod holder. A core tube 15 is connected to the tip of the rod 13.

[0020] A scaffolding 5 is positioned above the base. The scaffolding 5 has a pulley 7 on top of the rod 13.

[0021] The winch 3 can pull the wire. The wire is suspended on the pulley 7. One end of the wire is connected to the rod 13, and the other end is connected to the winch 3. The winch 3 can pull the wire and lift the rod 13.

[0022] This boring device, by making its components detachable, allows each component to be carried on a person's shoulder, making it easy to transport in and out of mountainous areas. Furthermore, it can have sufficient drilling capacity even in confined spaces. Therefore, by using this boring device, boreholes can be drilled even in hard bedrock in mountainous areas. The bedrock may be, for example, extremely hard rock.

[0023] The development of this compact boring device has made it possible to install earthing rods using a new construction method. Here, the earthing rod consists of multiple earthing rod components connected together. Each earthing rod component can be carried in by hand. In addition, the materials necessary for the earthing rod installation work (such as earthing resistance reducing agents) can also be carried in by hand. The necessary water is supplied via piping from a stream.

[0024] Figure 2(a) shows the process of drilling a borehole using a boring device. The core tube 15 is rotated by an electric core drill 11, and water supplied from a stream via a pipe is sent into the borehole while the core tube 15 drills through the bedrock.

[0025] Figure 2(b) shows the state after drilling to a desired depth. By drilling to the desired depth, a borehole 17 is formed. The winch 3 uses the pulley 7 on the rig 5 to pull up the core tube 15. After pulling up the core tube 15, the slime (excavated material) in the borehole 17 is discharged.

[0026] Figure 3(a) shows the state after repeated excavation and slime removal, resulting in deeper excavation than in Figure 2.

[0027] Figure 3(b) shows the state after drilling and slime removal has been repeated to excavate deeper. By drilling deeper, a borehole 21 is formed. The winch 3 uses the pulley 7 on the rig 5 to pull up the core tube 15. After pulling up the core tube 15, the slime (excavated material) in the borehole 21 is removed. Cementation is performed in the borehole 21. Cementation is the process of pouring cement into the wall of the borehole to solidify it and prevent the borehole wall from collapsing after drilling. Figure 3(b) shows the cemented areas 23 and 25 in the borehole 21.

[0028] Figure 4(a) shows the state after drilling to a predetermined depth (e.g., 20m) and repeating the process of excavation and slime removal.

[0029] Figure 4(b) shows the state after drilling and slime removal have been repeated to excavate to a predetermined depth. By drilling to the predetermined depth, a borehole 27 is formed. The winch 3 uses the pulley 7 of the rig 5 to pull up the core tube 15. After pulling up the core tube 15, the slime (excavated material) in the borehole 27 is removed. Cementation is applied to the walls of the borehole 27. Figure 4(b) shows the cemented area 29 in the borehole 27.

[0030] Figures 5 and 6 illustrate the steps for inserting the grounding rod. The grounding rod is made up of multiple connected grounding rod components. In this example, for simplicity, the grounding rod 37 is assumed to be made by connecting grounding rod components 31 and 33 with a connector 35.

[0031] Referring to Figure 5(a), the wire connected to the winch 3 is suspended from the pulley 7 on the tower 5 and connected to the grounding rod component 31. Therefore, the grounding rod component 31 is suspended from above by the winch 3.

[0032] Referring to Figure 5(b), the earth rod component 31 and the earth rod component 33 are connected by the connector 35. This forms the earth rod 37. Since the earth rod component 31 is suspended from above by the winch 3, the earth rod 37 is also suspended from above.

[0033] Figure 6 shows the earthing rod 37 inserted into the borehole 27. The winch 3 suspends the earthing rod 37 from above, and by gradually lowering it, the earthing rod 37 can be inserted into the borehole 27. The earthing rod 37 can be supported from above by the winch 3 using the pulley 7 of the scaffolding 5, eliminating the need to add extra parts.

[0034] In this example, the grounding rod component 33 is shown connected below the grounding rod component 31. However, the grounding rod component 33 may also be connected above the grounding rod component 31, which is suspended from above, thus suspending the grounding rod component 33 from above. Alternatively, the grounding rod component 31 and the grounding rod component 33 can be connected by screwing them together, for example, by forming a male thread on one of the grounding rod component 31 and a female thread on the other, without using the connector 35.

[0035] Figures 7 and 8 illustrate the step of injecting the grounding resistance reducing agent. The grounding resistance reducing agent is an auxiliary material for grounding work that effectively reduces grounding resistance by filling the gap between the grounding electrode and the soil.

[0036] This example describes injecting a grounding resistance reducing agent into the gap between the grounding rod 37 and the borehole 27 using an injection tool 41. The injection tool 41 is cylindrical, and it is desirable that the upper end is larger than the lower end. When the grounding resistance reducing agent is poured into the upper end of the injection tool 41, it flows out from the lower end. The injection tool 41 can be realized, for example, by connecting a funnel to the upper end of a PVC pipe. The injection tool 41 can be carried in by a person on their shoulder.

[0037] Referring to Figure 7(a), the grounding rod 37 is supported from above by a winch 3 using the pulley 7 of the tower 5. The worker inserts the lower end of the injection tool 41 into the gap between the grounding rod 37 and the wall of the borehole 27. When the worker pours the grounding resistance reducing agent from the upper end of the injection tool 41, the grounding resistance reducing agent flows out from the lower end of the injection tool 41. As a result, the borehole 27 is filled with the grounding resistance reducing agent from the back to the front. In addition, since the wall of the borehole 27 is cemented, the grounding resistance reducing agent does not flow out of the borehole 27.

[0038] Referring to Figure 7(b), the worker pours the grounding resistance reducing agent into the injection tool 41 from the upper end while raising the lower end of the injection tool 41, according to the amount of grounding resistance reducing agent to be filled. The grounding resistance reducing agent flows out from the lower end of the injection tool 41 and fills the gaps without any gaps from the back.

[0039] Referring to Figure 8(a), the worker further raises the lower end of the injection tool 41 while pouring the grounding resistance reducing agent from the upper end of the injection tool 41, according to the amount of grounding resistance reducing agent to be filled. The grounding resistance reducing agent is injected until a predetermined amount is reached. For example, this amount is enough to reach a height where work can be performed on the upper end of the grounding rod 37. Once the grounding resistance reducing agent is filled, the worker finishes filling the grounding resistance reducing agent.

[0040] Figure 8(b) shows the state after the injected grounding resistance reducing agent has hardened. Once the grounding resistance reducing agent has hardened, the grounding work is complete. At this point, it is no longer necessary to support the grounding rod 37 with the winch 3. Therefore, the scaffolding machinery is dismantled and moved to the next boring drilling site.

[0041] Figure 9 illustrates the steps for installing the buried ground wire 51. Referring to Figure 9(a), the buried ground wire 51 is attached to the upper end of the grounding rod 37. Referring to Figure 9(b), a base 53 is constructed on top of the grounding rod 37, and the grounding rod 37 is buried. A component 55 (such as the leg of a steel tower) is installed on the base 53. The buried ground wire is attached to the component 55. This connects the component 55 to the grounding rod 37. [Explanation of symbols]

[0042] 3 winches 5 Yagura (watchtower) 7 Pulley 11 Electric Core Drill 13 rods 15 Core Tubes 17 boreholes 21 boreholes 23. Areas where cementation was performed. 25 areas where cementation was performed 27 boreholes 29. Areas where cementation was performed. 31 Grounding rod component 33. Grounding rod component 35 Connectors 37 Grounding rod 41 Injector 51 Buried ground wire 53. Base 55 components

Claims

1. A method for installing an earthing rod in a borehole formed by a boring device, A borehole formation step involves drilling into the ground using a boring device to form a borehole, The grounding rod installation step involves inserting a grounding rod into the borehole, A reducing agent injection step in which a grounding resistance reducing agent is injected into the gap between the grounding rod and the borehole, This includes a buried ground wire attachment step in which a buried ground wire is attached to the aforementioned grounding rod and buried, In the borehole formation step, The boring device forms the borehole by rotating a core tube connected to a rod and drilling through it. A wire is suspended from a pulley located on the aforementioned boring device. The wire has one end connected to the winch and the other end connected to the rod. The winch can pull up the rod by pulling the wire. In the aforementioned grounding rod installation step, The wire has one end connected to the winch and the other end connected to the grounding rod component. A method for installing an earthing rod, wherein the earthing rod is constructed by connecting other earthing rod components to an earthing rod component that is suspended by the winch.

2. The method for installing an earthing rod according to claim 1, wherein in the step of injecting the reducing agent, the earthing resistance reducing agent is filled into the gap between the earthing rod and the borehole from the back using a cylindrical injection tool.

3. In the borehole formation step, cementation is applied to the wall of the borehole. The method for installing an earthing rod according to claim 2, wherein in the step of injecting the reducing agent, the earthing resistance reducing agent does not flow out of the cemented borehole.

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