JP3844014B2 - Ground electrode burying method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for burying a ground electrode embedded in a lower part of a foundation of a building.
[0002]
[Prior art]
Conventionally, when burying the underlying lower to the ground electrode of the buildings, or inserted and buried ground electrode material after forming a borehole by boring or the like ground after the end of the floor panel excavation process involved in foundation work, implantation There was a grounding rod.
[0003]
[Problems to be solved by the invention]
However, performing ground electrode burying work during the building foundation work process means that the series of foundation work processes will be interrupted, and the construction period will be prolonged, and on-site process management will become necessary. There was an annoying problem.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ground electrode embedding method that can be embedded without interrupting the foundation work process.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the ground electrode embedding method according to the first invention includes a step of drilling to a predetermined depth deeper than a planned root-cutting surface from the ground surface to the foundation ground, and the same diameter as the drilling hole or slightly smaller in diameter. A protective tube made of non-magnetic metal at the lower end and synthetic resin at the top is inserted into the excavation hole, and the connection between the metal portion at the lower end and the synthetic resin portion is almost at the same position as the planned rooting surface. And connecting the grounding electrode material made of copper wire or strip to the insertion guide fitting, attaching the insertion guide fitting to the tip of the insertion tube, and connecting it to the excavation hole through the protection tube. Cutting the ground electrode material with the length of the insertion process and the length of insertion of the ground electrode material into the drilling hole approximately equal to the length from the lower end of the drilling hole to the position of the predetermined insulation depth below the planned root cutting surface Connect the insulated wire to the upper end and insert the insertion tube. Insert the grounding electrode material into the drilling hole through the hollow part of the insertion tube until the top surface of the filling material is almost planned to be rooted in the drilling hole. And a step of extracting the insertion tube from the excavation hole while injecting. The step of holding the protective tube can be performed after the step of inserting the ground electrode material to the lower end of the excavation hole.
[0005]
The ground electrode embedding method according to the second invention includes a step of excavating to a predetermined depth deeper than a planned root cutting surface from the ground surface to the foundation ground, etc., and the same diameter as the excavation hole or a slightly smaller diameter, and the lower end is nonmagnetic Inserting a protective pipe made of synthetic resin into the excavation hole and holding the protective pipe so that the connection part between the metal part at the lower end and the synthetic resin part is almost at the same position as the planned rooting surface Connecting a ground electrode material made of a copper wire or a strip to the insertion guide fitting, attaching the insertion guide fitting to the tip of the insertion pipe, and inserting the insertion guide fitting into the drilling hole via the protective pipe; The insertion length of the ground electrode material is approximately equal to the length from the bottom of the drilling hole to the planned rooting surface. After cutting the ground electrode material and connecting an insulated wire to the top, drill the insertion tube. Push the ground electrode material to the bottom of the drilling hole while pushing it into the hole. A step of inserting, and a step of extracting the insertion tube from the drilling hole while injecting the filler into the drilling hole through the hollow portion of the insertion tube until the upper surface of the filling material becomes a surface to be almost rooted in the drilling hole. It is characterized by having. The step of holding the protective tube can be performed after the step of inserting the ground electrode material to the lower end of the excavation hole.
[0009]
[Action]
In the first invention, first, excavation holes are formed by excavating from the ground surface to a predetermined depth deeper than the planned root cutting surface. Next, a protective tube having the same diameter as the drilling hole or slightly smaller in diameter and having a non-magnetic metal at the lower end and a synthetic resin at the top is inserted into the drilling hole, and the connection between the lower end metal part and the synthetic resin part is made. The protective tube is held so that the part is almost in the same position as the planned root cut. Next, a ground electrode material made of a copper wire or a strip is connected to the insertion guide fitting, and the insertion guide fitting is attached to the distal end of the insertion tube and inserted into the excavation hole.
[0010]
Here, when the insertion length of the ground electrode material into the drilling hole is substantially equal to the length from the lower end of the drilling hole to the position of the predetermined insulation depth below the planned root cutting surface, the ground electrode material is cut and the upper end is Insulated wires are connected. Further, the insertion tube is pushed into the excavation hole, and the ground electrode material is inserted to the lower end of the excavation hole. Next, until the upper surface of the filler becomes a plane to be almost rooted in the excavation hole, the filler is injected into the excavation hole through the hollow portion of the insertion pipe, and at the same time, the insertion pipe is extracted from the excavation hole.
[0011]
In the second invention, as in the first invention, first, excavation holes are formed by excavating from the ground surface to a predetermined depth deeper than the planned root cutting surface. Next, a protective tube having the same diameter as the drilling hole or slightly smaller in diameter and having a lower end portion made of a non-magnetic metal and an upper portion made of synthetic resin is inserted into the drilling hole, and a connection portion between the lower end metal portion and the synthetic resin portion The protective tube is held so that the is almost the same position as the planned root cutting. Next, a ground electrode material made of a copper wire or a strip is connected to the insertion guide fitting, and the insertion guide fitting is attached to the distal end of the insertion tube and inserted into the excavation hole.
[0012]
Here, when the insertion length of the ground electrode material into the excavation hole becomes substantially equal to the length from the lower end of the excavation hole to the planned root cutting surface, the ground electrode material is cut and an insulated wire is connected to the upper end. Further, the insertion tube is pushed into the excavation hole, and the ground electrode material is inserted to the lower end of the excavation hole. Next, until the upper surface of the filler becomes a plane to be almost rooted in the excavation hole, the filler is injected into the excavation hole through the hollow portion of the insertion pipe, and at the same time, the insertion pipe is extracted from the excavation hole.
[0013]
In this way, in the first and second inventions, when these steps are completed before the root-cutting work, when excavating the periphery of the drilling hole by the root-cutting work, the position of the drilling hole is protected by the protective pipe. Can be confirmed. Next, when the periphery of the excavation hole is excavated, the protective tube is exposed, but the insulated wire is exposed by removing the synthetic resin portion while leaving the metal portion of the protective tube. As a result, after root cutting is completed and a building such as a building is constructed, wiring with the ground electrode becomes possible via the insulated wire.
In addition, when the protection pipe receives external force from an excavator etc. during the tree-cutting work, metal pipes such as steel pipes will be bent without breaking and will be an obstacle to the work. It will not break and will not be an obstacle to rooting work. Moreover, the electric wire or the ground electrode material in the portion below the metal protective tube provided on the lower surface of the excavation level is reliably protected from external force.
[0016]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 are process explanatory views showing an embodiment of the first invention.
FIG. 1A and FIG. 1B show the first and second steps, where GL in the figure is the current surface level, and there is a rooting level NL below GL. This NL is a level excavated by floor excavation work performed in building foundation work. In the first step, before the floor excavation work is started, the excavation hole 1 is formed by boring from the GL to a predetermined depth for embedding the ground electrode below the NL.
[0017]
In the second step, the protective tube 2 having the same diameter as the excavation hole 1 or slightly smaller in diameter is inserted into the excavation hole 1. This protective tube 2 is obtained by adding a VP (hard vinyl chloride) tube 2b to a lower end portion 2a formed of stainless steel which is a nonmagnetic metal. The protective tube 2 is inserted and held up to a position where the connecting portion is substantially the same as the NL. The lower end 2a of the protective tube 2 and the VP tube 2b are connected by screwing or bonding. The step of inserting the protective tube 2 into the excavation hole 1 can also be performed after the step of inserting an electrode material described later.
[0018]
Figure In the third step of 2 A, the borehole inserted within the protective tube 2 to 1, and insert the insertion guide fitting 4 in which the electrode member 3 made of a plurality of copper or a copper cord member is connected, further insertion The electrode member 3 is inserted into the excavation hole 1 by fitting the guide fitting 4 to the tip of the insertion tube 5 and lowering the insertion tube 5. If the excavation hole 1 is deep at this time, the insertion pipe 5 is added and inserted. The insertion tube 5 pushes the insertion guide fitting 4 downward by abutting against a flange portion 6 formed on the insertion guide fitting 4.
[0019]
In the fourth step shown in FIG. 2B, when the length L1 of the inserted electrode material 3 reaches a value approximately equal to the embedded length L2 of the electrode material 3, the electrode material 3 is cut on the GL, and the compression terminal 7 is used. Connect to insulated wire 8 such as IV wire. The buried length L2 is a length obtained by subtracting the insulating depth L4 from the depth L3 from the NL to the lower end of the excavation hole 1. The insulation depth L4 is usually 5 to 200 m or more.
[0020]
In the fifth step of FIG. 3 A, further, lowers the insertion tube 5, inserting the electrode member 3 and the insulated wire 8 into the wellbore 1, to insert the tip of the electrode material 3 to the lower end of the borehole 1. Here, the position of the compression terminal 7 which is the upper end of the electrode material 3 becomes a position of a distance L4 from NL downward, and the upper part is insulated by the insulator of the insulating wire 8 and has an insulation depth with respect to the electrode material 3. L4 is secured.
[0021]
In the sixth step shown in FIG. 3B, while cutting off the extra length of the insulating wire 8 remaining above the upper end of the protective tube 2, while pressing the filler 10 from the tip of the insertion tube 5 with a pressure pump or the like, Pull out the insertion tube 5. When the upper surface of the filler 10 reaches the lower end 2a of the protective tube 2 and substantially coincides with NL, the injection of the filler 10 is stopped, and the insertion tube 5 is removed from the excavation hole 1.
The first to sixth processes so far are performed before root cutting, and the subsequent processes are performed in parallel with the floor excavation work.
3, the AA line cross section is shown in FIG. 5, the BB line cross section is shown in FIG. 6, and the CC line cross section is shown in FIG.
[0022]
In the seventh step of FIG. 4 A, the GL is excavated by cut roots borehole 1 protective tube 2 held in is exposed. Therefore, the VP pipe 2b above the protective pipe 2 is removed from the lower end 2a and removed. In addition, by marking the lower end outer peripheral surface of the VP pipe 2b with red, white, yellow, etc. in advance by applying paint or tape, it is easy to check the level when excavating the periphery of the protective pipe 2. .
[0023]
In the eighth step shown in FIG. 4B, since the upper end of the lower end 2a is exposed in the excavation hole 1 by excavating to NL, the insulating wire 8 supported by the filler 10 in the excavation hole 1 is exposed. The part is excised leaving the necessary length, and the terminal is further cured. Here, if the lower end portion 2a protrudes excessively or if the surface level of the filler 10 is excessive or insufficient, repair is made. With these steps, the ground electrode burying work is completed. Thereafter, after the building is erected, connection with the ground electrode is performed.
[0024]
In addition, after the fifth step, if necessary, the outer periphery of the insulated wire 8 accommodated in the protective tube 2 is covered with a VP tube, an EP (polyethylene) tube, a fluororesin tube, etc. The insulation wire 8 may be prevented from being damaged until the periphery is excavated and the VP pipe 2b is removed.
Also, the lower end 2a of the protective tube 2 is made of a non-magnetic metal to prevent electromagnetic induction from occurring at the lower end 2a when a ground electrode is connected later and current actually flows through the lower end 2a. It is to do.
[0025]
Next, an embodiment of the second invention will be described. Since the embodiment of the second invention is common to the embodiment of the first invention until the third step, the fourth step will be described. FIG. 8 shows the fourth step. When the length L1 of the inserted electrode material 3 reaches a value substantially equal to the embedded length L3 of the electrode material 3 , the electrode material 3 is cut on the GL, and the compression terminal 7 is used. Connect to insulated wire 8. The buried length L3 is a depth from NL to the lower end of the excavation hole 1.
In the fifth step of FIG. 9 A, further, lowers the insertion tube 5, inserting the electrode member 3 and the insulated wire 8 into the wellbore 1, to insert the tip of the electrode material 3 to the lower end of the borehole 1. Here, the position of the compression terminal 7, which is the upper end of the electrode material 3, is the NL position, and the portion above it is insulated by the insulator of the insulating wire 8.
[0026]
In the sixth step shown in FIG. 9B, while cutting off the extra length portion of the insulating wire 8 remaining above the upper end of the protective tube 2, while pressing the filler 10 from the tip of the insertion tube 5 with a pressure pump or the like, Pull out the insertion tube 5. When the upper surface of the filler 10 reaches the lower end 2a of the protective tube 2 and substantially coincides with NL, the injection of the filler 10 is stopped, and the insertion tube 5 is removed from the excavation hole 1.
The first to sixth processes so far are performed before root cutting, and the subsequent processes are performed in parallel with the floor excavation work.
[0027]
In the seventh step of FIG. 10 A, the GL is excavated by cut roots borehole 1 protective tube 2 held in is exposed. Therefore, the VP pipe 2b above the protective pipe 2 is removed from the lower end 2a and removed.
In the eighth step shown in FIG. 10B, since the excavation to NL exposes the compression terminal 7 to which the upper end of the lower end 2a and the insulation wire 8 are connected to the excavation hole 1, the insulation wire 8 has a necessary length. Exclude it, and then cure the terminal. Here, if the lower end portion 2a protrudes excessively or if the surface level of the filler 10 is excessive or insufficient, repair is made. With these steps, the ground electrode burying work is completed. Thereafter, after the building is erected, connection with the ground electrode is performed.
[0028]
In the embodiments of the first and second inventions, the grounding electrode 3 is buried before the floor excavation work of the building, so that the boring work after root cutting, which has been conventionally performed, becomes unnecessary. Since the portion where the ground electrode is embedded is cured by the protective tube 2 made of a VP tube, it is possible to proceed while confirming the position of the ground electrode during the tree-cutting work.
[0029]
As a result, the construction work is not interrupted because the ground electrode is buried after the floor excavation work, and the construction process management becomes easy. In addition, the construction period is greatly shortened. Further, the insulating wire 8 used in the above-described embodiment is filled with a jelly-like insulating material having water repellency and water impermeability at the boundary between the core and the insulator. Infiltration from the boundary to the inside is prevented, and the insulation and durability as a ground electrode are improved.
Instead of the insulated wire 8 of the embodiment, it is also possible to use an electric wire inserted through an insulating tube.
[0030]
FIG. 11 to FIG. 14 are cross-sectional views of excavation holes showing other embodiments. FIG. 11 shows the case where three ground electrodes 3 made of copper wire are used, and FIG. Shows the case. FIG. 13 shows a case where two copper strips are used for the ground electrode, and FIG. 14 shows a case where three copper strips are used similarly.
[0031]
Next, still another embodiment will be described.
15A to 15C are process explanatory views showing the above-described embodiment. In this example, as in the previous example, the ground electrode work after the completion of the root-cutting work is maintained at a certain required resistance value by embedding the electrodes by the placement method before the construction of the root-cutting work. Is. That is, as shown in the figure, the grounding rods 11, 12,... Are sequentially placed from the current ground level GL. The grounding rods 11 to 14 are galvanized iron rods and are connected by screw portions formed on the upper and lower ends.
[0032]
The lower end portion 11a of the grounding rod 11 to be placed first is formed in a conical shape having an outer diameter that is thicker than the outer diameter of the main body of the grounding rod 11 by about 0.5 to 1 mm and pointed downward. Is hardened and hardened. By making the outer diameter of the lower end portion 11a thicker than that of the main body, the outer surface of the grounding rods 11 to 14 is prevented from being damaged by friction with the ground at the time of placement, and the durability as a grounding electrode material is improved. improves.
[0033]
The grounding rod 11 and the like are driven by a high-vibration driving machine (not shown) having a strong hitting force. When the driving progresses and the lower end portion 11a of the grounding rod 11 reaches the depth Ls to the planned root cutting surface NL, the grounding resistance Rs is measured. Furthermore, the grounding resistance is measured while continuing the placement and increasing the placement depth.
Here, the grounding resistance value required for the grounding rods 11 to 14 is R after completion of the rooting work, and the grounding rods 11 to 14 are placed up to a depth Lt at which the grounding resistance R is obtained before the rooting construction. When the grounding resistance value obtained from the entire grounding rods 11 to 14 is Rt, the mutual relationship among the grounding resistances R, Rs, and Rt is as follows.
[0034]
[Expression 1]
R = Rs · Rt / (Rs−Rt)
[0035]
From Equation 1, the ground resistance Rt is obtained by the following equation.
[0036]
[Expression 2]
Rt = Rs · R / (Rs + R)
[0037]
Therefore, the grounding resistance value measured each time the placement depth is increased is monitored, and when the measured value matches Rt obtained by Equation 2, the placement of the grounding rods 11 to 14 is terminated.
Next, foundation work is started, root cutting work is performed, and the ground is excavated to NL. Thereby, since the upper part of the ground rod 13, 14 is exposed are removed by cutting the ground rod 1 4 near NL. Thereafter, after a building such as a building is completed, the wire 15 is connected to the upper end of the grounding rod 13 and wiring work for the ground electrode is performed.
Thus, in the embodiment of the fourth aspect of the present invention, these steps are completed before the root-cutting work, so that after the start of the root-cutting work, it is simple to simply remove the exposed grounding rod. It becomes work, and it is not necessary to interrupt the foundation work of the construction for burying the ground electrode. As a result, construction process management becomes easy and the construction period is greatly shortened.
[0038]
【The invention's effect】
As described above, according to the first and second inventions, the ground electrode is buried to a predetermined depth by excavating the ground before the root cutting work is performed, and the upper portion of the excavation hole is removed by the root cutting. By inserting a protective tube made of synthetic resin, it is possible to remove the protective tube by excavating around the excavation hole with the protective tube as a mark during the tree-cutting work. As a result, after rooting is completed and the building is completed, wiring to the ground electrode becomes possible simply by connecting the exposed insulated wire. In addition, since the ground electrode is buried before the construction work, the foundation work is not interrupted and the ground electrode work is not performed after the completion of the root-cutting work, thereby shortening the work period.
[Brief description of the drawings]
FIG. 1A is an explanatory diagram showing a first step of an embodiment according to the first invention.
FIG. 1B is an explanatory diagram showing a second step of the embodiment according to the first invention.
FIG. 2A is an explanatory diagram showing a third step of the embodiment according to the first invention.
FIG. 2B is an explanatory diagram showing a fourth step of the embodiment according to the first invention.
FIG. 3A is an explanatory diagram showing a fifth step of the embodiment according to the first invention.
FIG. 3B is an explanatory diagram showing a sixth step of the embodiment according to the first invention.
FIG. 4A is an explanatory diagram showing a seventh step of the embodiment according to the first invention.
FIG. 4B is an explanatory diagram showing an eighth step of the embodiment according to the first invention.
FIG. 5 is a cross-sectional view taken along line AA in FIG. 3A.
6 is a cross-sectional view taken along line BB in FIG. 3B.
7 is a cross-sectional view taken along line CC of FIG. 3B.
FIG. 8 is an explanatory diagram showing a fourth step of the embodiment according to the second invention.
FIG. 9A is an explanatory diagram showing a fifth step of the embodiment according to the second invention.
FIG. 9B is an explanatory diagram showing a sixth step of the embodiment according to the second invention.
FIG. 10A is an explanatory diagram showing a seventh step of the embodiment according to the second invention.
FIG. 10B is an explanatory diagram showing an eighth step of the embodiment according to the second invention.
FIG. 11 is a cross-sectional view showing another embodiment.
FIG. 12 is a cross-sectional view showing another embodiment.
FIG. 13 is a cross-sectional view showing another embodiment.
FIG. 14 is a cross-sectional view showing another embodiment.
Figure 15A is an explanatory diagram showing a step of another embodiment.
Figure 15B is an explanatory view showing a step of another embodiment.
Figure 15C is an explanatory diagram showing a step of another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavation hole 2 Protective pipe 2a Lower end part 2b VP pipe 3 Electrode material 4 Insertion guide metal fitting 5 Insertion pipe 6 Flange part 7 Compression terminal 8 Insulated wire 10 Filling material 11-14 Ground rod 15 Electric wire

Claims (2)

A process of excavating to a predetermined depth deeper than the planned deforestation surface from the ground surface to the foundation ground,
A protective tube made of a non-magnetic metal with the same diameter or slightly smaller diameter than the drilling hole and with the upper end made of synthetic resin is inserted into the drilling hole, and the connection between the lower end metal part and the synthetic resin part is cut down. Holding the protective tube so that it is substantially in the same position as the planned surface;
Connecting the ground electrode material made of copper wire or strip to the insertion guide fitting, attaching the insertion guide fitting to the tip of the insertion pipe and inserting it into the excavation hole via the protective pipe;
The length of the ground electrode material inserted into the drilling hole is approximately equal to the length from the lower end of the drilling hole to the position of the predetermined insulation depth below the planned root cutting, and the ground electrode material is cut and insulated at the upper end. Inserting the ground electrode material to the lower end of the excavation hole while pushing the insertion tube into the excavation hole after connecting the electric wire;
Extracting the insertion tube from the excavation hole while injecting the filler into the excavation hole through the hollow portion of the insertion tube until the upper surface of the filling material is almost planned to be rooted in the excavation hole;
A method for burying a ground electrode, characterized by comprising: A process of excavating to a predetermined depth deeper than the planned deforestation surface from the ground surface to the foundation ground,
A protective tube made of a non-magnetic metal with the same diameter or slightly smaller diameter than the drilling hole and with the upper end made of synthetic resin is inserted into the drilling hole, and the connection between the lower end metal part and the synthetic resin part is cut down. Holding the protective tube so that it is substantially in the same position as the planned surface;
Connecting the ground electrode material made of copper wire or strip to the insertion guide fitting, attaching the insertion guide fitting to the tip of the insertion pipe and inserting it into the excavation hole via the protective pipe;
The length of the ground electrode material inserted into the drilling hole is approximately equal to the length from the bottom of the drilling hole to the planned root cutting. Inserting the ground electrode material to the lower end of the excavation hole while pushing the tube into the excavation hole;
Extracting the insertion tube from the excavation hole while injecting the filler into the excavation hole through the hollow portion of the insertion tube until the upper surface of the filling material is almost planned to be rooted in the excavation hole;
A method for burying a ground electrode, characterized by comprising:

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