JPH08264252A - Formation of earth electrode - Google Patents

Abstract

PURPOSE: To improve the expanding effect of an earth electrode and bury the earth electrode in a vertical hole concurrently with the excavation of the vertical hole. CONSTITUTION: A copper wire 6 functioning as an earth electrode is regulated by a spiral vane 5 and spirally wound on the peripheral wall of a boring rod 1 and vertically thrust into the ground 4 by the thrust rotary driving force of the boring rod 1. When the prescribed earth resistance value is attained, the copper wire 6 is cut off on the delivery side, the boring rod 1 is extracted from the ground while being rotated in the opposite direction, the copper wire 6 is left in a vertical hole excavated by the boring rod 1 in the spirally wound state, and a reducing agent is poured into the vertical hole to form the earth electrode.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for forming a ground electrode.

[0002]

2. Description of the Related Art The Electricity Business Law stipulates grounding for electric lines and other electric works. In high-voltage long-distance transmission lines, electrical equipment and transmission lines are grounded to a grounding electrode buried in the soil near the utility pole. As a method of forming this grounding electrode, generally, a grounding electrode such as a copper wire is linearly driven into the soil in a substantially vertical manner, and a sodium silicate, urea resin, or the like around the driven grounding electrode is used. It is formed by pouring a reducing agent to reduce the earth resistance in the soil and wrapping a linear rod-shaped earth electrode with the reducing agent.

In the conventional ground electrode forming method in which a linear rod-shaped ground electrode is wrapped with a reducing agent, the effect of enlarging the ground electrode cannot be expected so much.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, the present invention provides a method of forming a ground electrode which can be expected to have an effect of expanding the ground electrode. Further, the present invention provides a method for forming a grounding electrode, which allows the grounding electrode to be embedded in the vertical hole at the same time when the vertical hole is excavated. Furthermore,
The present invention provides a method for forming a ground electrode that enables measurement of the ground resistance while the ground electrode is being buried in a vertical hole.

[0005]

In order to achieve the above object, a method of forming a ground electrode according to the present invention is to rotate soil around an axis to screw the soil into the soil in the screwing direction. Is a spiral blade provided with the function of discharging in the opposite direction.The tip side of the copper wire that functions as a grounding electrode is detachably connected to the tip side of the boring rod formed on the peripheral wall, and the screw rod is rotated by screwing. By controlling the copper wire that is fed to the tip side of the boring rod while being given tensional resistance while being fed with a propulsive force, by the spiral blade formed on the peripheral wall of the rod, the copper wire is spirally wound around the peripheral wall of the rod. While screwing the soil with a spiral blade to a depth that reaches a predetermined ground resistance value, screw the boring rod vertically into the soil, and cut the copper wire on the feeding side while reaching a predetermined ground resistance value. Said borin Rotate the rod in the direction opposite to the screw-in rotation direction to remove the tip end side of the copper wire that is locked to the tip side of the rod, and further rotate the boring rod in the opposite direction to the screw-in rotation direction. While pulling out the rod from the ground while leaving the copper wire spirally wound around the peripheral wall of the rod in the vertical hole excavated by the boring rod while maintaining this spiral winding form, It is characterized in that a reducing agent for reducing a ground resistance value such as urea resin is poured into a vertical hole accommodating a copper wire holding a spirally wound form.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of a method of forming a ground electrode according to the present invention. 1 and 2, 1 is vertically supported by a boring machine 3 toward the center of the primary hole 2, and the boring machine 3
It is a boring rod which is screwed vertically into the soil 4 while being rotated by the rotational driving force of. On the peripheral wall of the boring rod 1, spiral blades 5 as shown in FIG. 2 are formed over the entire length of the rod. The spiral blade 5 has a function of discharging the soil in a direction opposite to the screwing direction by screwing the rod 1 into the soil while rotating the rod 1 about the rod axis. The bowling rod 1
The diameter of the rod is about 50 mm, and the diameter including the spiral blade is 8 mm.
It is formed to about 0 mm.

The tip end side of the boring rod 1 is detachably connected to the tip end side of the copper wire 6 functioning as a ground electrode, and the screwing rotational propulsion force of the boring rod 1 is obtained to obtain the boring rod 1 The copper wire 6 which is attached to the tip side and is fed out while giving tension resistance is regulated by the spiral blade 5 formed on the peripheral wall of the rod and reaches a predetermined ground resistance value while being spirally wound around the peripheral wall of the rod. The boring rod 1 is vertically screwed into the soil while discharging the soil with the spiral blades 5 to the depth, and the copper wire 6 on the feeding side is cut while reaching a predetermined ground resistance value.

The copper wire 6 having a diameter of 6 to 8 mm is adopted. As a method of connecting the tip end side of the copper wire 6 to the tip end side of the boring rod 1, a hook-shaped hooking portion 7 is formed on the tip end side of the copper wire 6 as shown in FIG. The stopper 7 is hooked in a locking hole 8 formed on the tip side of the rod 1 and is locked when the rod 1 is screwed and rotated, but the copper wire 6 is pulled out when the rod 1 is pulled out in the opposite rotation. The hooking portion 7 is detached from the locking hole 8 of the rod 1.

When the copper wire 6 is spirally wound around the peripheral wall of the boring rod 1, the copper wire 6 is unwound while giving tension resistance to the copper wire 6. In this embodiment, as shown in FIG. Tension resistance is given to the copper wire 6 by feeding it out from the free drum 9 which holds the copper wire 6 through the brake device 10. Needless to say, the drum 9 itself may be provided with a braking function without using the braking device.

As described above, the copper wire 6 which is fed while the screwing rotational driving force of the boring rod 1 is obtained and which is connected to the tip end side of the boring rod 1 and is given tension resistance is provided on the peripheral wall of the rod. The rod is regulated and guided by the formed spiral blade 5 and spirally wound around the peripheral wall of the rod, but as shown in FIG. 2, the rod is guided by the lower surface of the spiral blade 5 and regulated so as not to be displaced upward. It is wrapped around the peripheral wall of 1. Due to the restriction effect of the spiral blade 6, the copper wire 6 is wound around the rod 1 in a spiral state with substantially the same pitch.

In this way, when the copper wire 6 functioning as a grounding electrode is wound into the soil and the target depth is reached, the grounding resistance value is measured by the measuring device 11 as shown in FIG. If so, the copper wire 6 is cut between the brake device 10 and the rod winding portion.

Next, the boring rod is screwed in and rotated in the direction opposite to the rotating direction, and the hooked portion 7 of the copper wire, which is locked to the tip side of the rod, is removed from the locking hole 8 of the rod 1. Further, by pulling the boring rod out of the soil while screwing the boring rod in the direction opposite to the rotating direction, a vertical hole (1
2) The copper wire spirally wound around the peripheral wall of the rod is left in the state of maintaining the spiral winding form, and the copper wire 6 is housed in the vertical hole 12 accommodating the copper wire 6 holding the spiral winding form. A reducing agent 13 such as acid soda or urea resin for reducing the ground resistance value is poured to form a ground electrode.

The rotation and pulling speed when pulling out the boring rod 1 from the soil are the same as the rotation and pulling speed when screwing the rod 1 into the soil.

The grounding electrode forming method of the present invention is effective in the gravel area, volcanic ash area, etc. as the enforcement area, and the depth of excavation of vertical holes from 2 to It is often applied when the target resistance value can be secured by enforcing about 8 m.

[0015]

According to the method for forming a ground electrode of the present invention, the copper wire functioning as a ground electrode is left in the vertical hole while maintaining the spiral winding shape, and the copper wire having the spiral winding shape is retained. By pouring a reducing agent for reducing the ground resistance value into the accommodated vertical hole, the ground electrode is formed, so that it is possible to form a ground electrode close to a copper mesh having an inner diameter similar to the spiral inner diameter, It is expected that the expansion effect of the ground electrode can be improved as compared with the conventional ground electrode forming method in which the linear rod-shaped ground electrode is wrapped with the reducing agent.

Further, since the present invention is a method of forming a grounding electrode in which a copper wire functioning as a grounding electrode can be buried in the vertical hole while maintaining the spirally wound form at the same time when the vertical hole is excavated, a large cost is required. You can get down.

Further, according to the method for forming a ground electrode of the present invention, a market-based copper rod (copper wire) can be used as it is wound on a drum, so that the cost can be greatly reduced.

Further, according to the method for forming a ground electrode of the present invention, the ground resistance can be measured while the ground electrode (copper wire) is being embedded in the vertical hole.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an enforcement procedure of the present invention.

FIG. 2 is an enlarged side view of a main part of the present invention.

FIG. 3 is a vertical cross-sectional side view showing an enforcement procedure of the present invention.

[Explanation of symbols]

 1 Boring rod 2 Primary hole 3 Boring machine 4 Soil 5 Spiral blade 6 Copper wire 7 Hooking part 8 Locking hole 9 Free drum 10 Brake device 11 Measuring instrument 12 Vertical hole 13 Reducer

Claims (1)

[Claims] 1. A boring having spiral blades (5) formed on its peripheral wall, which are provided with a function of discharging soil in a direction opposite to the screwing direction by screwing the soil into the soil while rotating about an axis. The tip end side of the rod (1) is detachably connected to the tip end side of the copper wire (6) which functions as a ground electrode, and the screwing rotational propulsion force of the boring rod is obtained so that the tip end side of the boring rod is By controlling the copper wire that is locked and given tension resistance with the spiral blade formed on the peripheral wall of the rod and spirally winding it around the peripheral wall of the rod, the spiral blade reaches a depth to reach a predetermined ground resistance value. While the soil is being discharged, the boring rod is vertically screwed into the soil (4), the copper wire on the feeding side is cut while the predetermined ground resistance value is reached, and the boring rod is screwed in the rotating direction. Rotate in the opposite direction By removing the tip side of the copper wire that is locked to the tip side of the rod, and further by screwing the boring rod in the opposite direction to the rotating direction and pulling out the rod from the soil, The copper wire spirally wound around the peripheral wall of the rod was left in the vertical hole (12) excavated in 1. with the spiral wound form retained, and the copper wire retained in the spiral wound form was accommodated. A method of forming a ground electrode, characterized in that a reducing agent (13) for reducing a ground resistance value such as urea resin is poured into the vertical hole.