JP3032856B2 - Drilling equipment for burying grounding members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is a transformer, surge arrester, tower fitted with a high-pressure apparatus or the like, in grounding such a utility pole,
The present invention relates to a drilling device suitable for use in drilling a hole for embedding a ground member .

[0002]

2. Description of the Related Art In order to prevent accidents due to earth leakage, grounding work is required by law for electric poles equipped with transformers, lightning arresters, high-voltage equipment, and the like. This grounding work is performed by embedding a grounding member serving as a grounding electrode at a predetermined depth at a position away from the utility pole and connecting a grounding wire to the grounding pole.

Conventionally, this embedding work of a grounding electrode has been performed by hammering a grounding member such as a metal rod into the ground, hardening the soil, and then pouring a chemical for improving conductivity.
Then, the electric resistance value of the embedded ground electrode was measured, and if the specified resistance value was obtained, the result was judged as pass.

[0004]

However, such a method of directly driving the grounding member requires a considerable strength of the grounding member, and furthermore, when there is a hard object such as a stone in the ground, the driving is performed. There was a problem that it was not possible.

[0005] Further, in such a method, it is difficult to increase the implantation depth, so that a specified resistance value is often not obtained. If the specified electrical resistance cannot be obtained by one embedding, the grounding electrode must be buried repeatedly at a distance (1 to 1.5 m) away from the specified electric resistance until the resistance is obtained. Therefore, a lot of labor and time are required, and since the ground contact point is located away from a steel tower, a telephone pole, etc., a land problem has occurred. Above conventional
Holes to bury ground electrode material in advance to improve the problem of
Hole, insert the ground electrode material into this hole, and then fill
A filling method has been proposed (for example, Japanese Unexamined Patent Publication No.
No. 65975). However, such connections
A connector that can easily drill holes for embedding ground electrode materials
A relatively inexpensive device was not developed. So
Here, the invention of the present application provides a hole for burying the ground electrode material efficiently.
An object of the present invention is to provide a drilling device that can drill well and has low noise .

[0006]

In order to solve the above problems, the present invention employs the following configuration. That is, the drilling device for embedding the grounding member according to the present invention includes a traveling device.
A vertically rotatable boom provided on a bogie provided with
Guy of a predetermined length supported by a boom so that it can move back and forth
And the guide cell, which is attached to the guide cell
A rotating motor to which a drill rod is connected at the end;
Feed device for moving diversion motor forward and backward, and outer cylinder
The cylinder and piston for impact are provided inside the
An air drive with a rear end connected to the tip of the drill rod
A dynamic percussion device and an outer diameter larger than the outer cylinder of the percussion device
A piston attached to the tip of the hitting device.
A drill bit that is hit by
Air for striking supplied through the interior of the
The powder is discharged from the drill bit and the powder is passed through the outer surface of the outer cylinder.
And is configured to be discharged from the perforated hole .

[0007]

Since the drilling device has a traveling device, it can be easily moved to an arbitrary place. Raise the guide cell and support it at the desired drilling position with the boom,
While the drill bit is grounded, the drill bit is rotated by a rotary motor while the bit is hit with the hitting device, and the feed device is rotated via the rotary motor. When the striking device is sent downward, a drill hole having a predetermined diameter is drilled in the ground by the drill bit at the tip. Drill bit
The outer diameter of the rod is larger than the diameter of the outer cylinder of the impactor (drilled rod diameter).
Perforated hole wall because it is larger than the outer diameter of
A gap is formed between the outer cylinder and the drill rod of the device,
Blowing air discharged from the drill bit passes through the gap.
Is discharged to the outside.
Is discharged by

[0008] This drilling device uses a rotatable boom to guide the drill.
Id cells can be moved, so
It can be easily drilled. In addition, hitting device
As it fits into the perforated hole, noise flow to the outside
There is little out. The powder is the outer surface of the outer cylinder of the impactor.
Double pipe because it is discharged through the hole
Does not need to be discharged through the interior of
And can be robust.

【Example】

Hereinafter, embodiments of the present invention will be specifically described. FIG. 1 shows a drilling device for burying a grounding member according to the present invention.
In this embodiment, a boring device 1 is provided with a rotating hydraulic motor 6 mounted on a guide cell 5 mounted on a rotatable boom 4 of a truck 3 having a crawler type traveling device 2. It is supported movably back and forth (up and down in the figure). The guide cell 5 is provided with a feed hydraulic motor 7 which is a feed device for driving the rotary hydraulic motor 6 back and forth, and a feed chain 9 which is fed in forward and reverse directions by the motor. The rotating motor 6 is mounted on a carriage plate 8 mounted on this chain. 11 is before and after the guide cell 5
(Up and down when standing) hydraulic cylinder, 12
Is a hydraulic cylinder for tilting the guide cell 5 in the upright state to the left and right.

A drill rod 15 is connected to the rotating shaft of the rotating motor 6 by a coupling sleeve. The tip of the drilling rod 15 has a down-the-hole type impact device 2
0 is connected by a screw. Figure 3 is a cross-sectional view of a percussion device, Ueasuri forms an outer tube - back head 22 of threaded is screwed to the rear end portion of the probe 23, the Ueasuri - Bed (outer
Cylinder 25 for hitting is provided in the cylinder).

A piston 24 also serving as a sliding valve is slidably fitted inside the cylinder 25.
A bit holding portion is provided at the tip of the wear sleeve 23, and a drill bit 3 having a carbide tip planted at the tip.
0 is attached to a chuck 26 provided in this portion. The striking device 20 is connected to the drill rod 15 by a threaded portion of the back head 22. In the drawing, reference numeral 27 denotes a distributor fitted into a hole provided in the core of the piston, reference numeral 28 denotes a check valve, and reference numeral 31 denotes a retainer.
The air supplied through the drill rod passes through the air passage 35.
, The check valve 28 is depressed, and flows into the operating chamber 36 through the distributor 27 and the space between the wear sleeve 23 and the cylinder 25. This air is supplied to the operating chamber.
36 to front chamber 37, rear chamber 38
, Respectively, and a blow cycle is performed.

Before the bit 30 lands, the bit and the piston 24 are lowered to the lowest position, and air is discharged from the blow port 40 of the cylinder 25 through the inside of the piston and from the tip of the bit. When the bit lands due to the lowering of the striking device 20, the bit is pushed up until it hits the shoulder of the chuck 26, and the high-pressure air in the operating chamber 36 releases the vertical groove 24a of the piston and the underwear of the wear sleeve 23.
Through the cut 23a, it flows into the front chamber-37. This air pressure causes the piston to rise rapidly (see FIG. 4). The inflow port to the front chamber 37 is closed, and the inflow of air is stopped, but the piston keeps rising due to the expansion and inertia of the air in the chamber.

As the piston 24 rises, the air in the rear chamber 38 is compressed, and the high-pressure air in the operating chamber 36 flows into the rear chamber 38 through the cylinder and piston undercuts 25a, 24a (see FIG. 1). 5). The pressure in the rear chamber stops the piston from rising, and the striking energy is stored.
At this time, the air in the front chamber 37 is exhausted through the bit.

[0014] The expansion of the air in the rear chamber 38 causes the piston to rapidly descend and strike the bit. When the piston comes out of the distributor 27 due to this descent, the air in the rear chamber passes through the inside of the piston and is discharged from the bit. After hitting the bit, the piston bounces slightly and air flows back into the front chamber to start the next cycle.

The truck 3 has a built-in hydraulic device, and the traveling device, the boom, the hydraulic motor, the hydraulic cylinder and the like are driven by the hydraulic pressure from the hydraulic device. The striking device is driven by air supplied from a separate compressor 32.

When drilling a pilot hole for burying the grounding member by using the drilling device, the carriage 3 is moved to a desired position, and the guide cell 5 which can be raised and turned over is raised, and the leg at the lower end thereof is raised. The part 5a is grounded and fixed. In this state, when the drill bit 30 is pressed against the ground with the feed motor 7 while rotating and hitting the drill bit, drilling is performed. Air for driving the striking device is sent from the compressor 32 through a through hole provided inside the drill rod. In the drilling hole, air that drives the piston of the striking device 20 is discharged from the blowhole of the drilling bit 30 to discharge the dust in the hole and cool the bit.

The drilling depth is usually about 4.5 m, but if the present drilling device is used, it is possible to drill up to about 15 m. In this case, drilling is performed while joining a plurality of drilling rods. The diameter of the pilot hole is, for example, 66 mm.

When a pilot hole of a desired depth is drilled,
The impact device 20 is pulled up from the hole by reversing the motor 7, and as shown in FIG. 6, a grounding member (for example, a grounding rod having a diameter of 10 mm) 46 is inserted into the lower hole 44 formed on the side of the utility pole 45. As the grounding member, an appropriate member such as a metal rod, a plate, or a wire can be employed. The upper end of the grounding member 46 is connected to an existing grounding member 46a by a conductor 46b such as a copper wire, a carbon sheet, or a copper plate. After that, the filling material 47 is filled, and the opening 49 (depth d is 0.75 m) is filled with the topsoil 48. As the filler 47, ordinary soil may be used, but it is preferable to use lime-based powder in order to improve conductivity. It is effective if this lime-based powder is mixed in the topsoil. In addition, this lime-based powder is alkaline, has an effect of neutralizing acidic soil, and has an effect of taking in underground heavy metals, and has an effect that once it is taken in, it does not flow out.

Since this drilling device uses a down-the-hole type hitting device, the air used for hitting can be used as it is as a blow for discharging the dust. This type of percussion device cannot penetrate the piston so much because it penetrates into the perforated hole itself, but since the poles are usually located on the ground mainly composed of soil, There is no problem in drilling. Also, this type of hitting device produces less noise than other rock drills and is suitable for work near cities .

[0020]

As described above, according to the present invention,
Drilling device for burying grounding member transmits thrust and rotational force
A striking device is attached to the tip of the drill rod, and the striking device is
Drill with the drill bit attached to the tip of the
As the drill progresses, the drilling device itself fits into the hole
To reduce the noise leaking to the outside.
It is possible. The outer diameter of the drill bit is outside the impact device
Larger than the diameter, and the drill bit is used for impact.
Is configured to discharge air
Flour generated by the impact of the nut
It can be discharged to the outside together with air through the wall. This
The discharge of powder is assured and the discharge structure is simple.
And it can be made robust .

[Brief description of the drawings]

FIG. 1 is a side view of a drilling device representing one embodiment of the present invention.

FIG. 2 is a front view of the main part.

FIG. 3 is a sectional view of a striking device.

FIG. 4 is an enlarged sectional view of a main part.

FIG. 5 is an enlarged sectional view of a main part.

FIG. 6 is an explanatory view of a state in which a grounding member is embedded .

[Explanation of symbols]

 Reference Signs List 1 drilling device 2 traveling device 3 carriage 4 boom 5 guide cell 6 rotation motor 7 feed motor 15 drilling rod 20 hitting device 30 drilling bit 45 telephone pole 44 pilot hole 46 grounding member

Continuation of the front page (56) References JP-A-6-132061 (JP, A) JP-A-6-108768 (JP, A) JP-A-61-165975 (JP, A) JP-A-56-176288 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 12/22 E21B 4/06-4/14 H01R 43/00

Claims (1)

(57) [Claims] An up and down provided on a carriage provided with a traveling device.
A rotatable boom, and the boom makes it possible to move back and forth.
A guide cell of a predetermined length supported, and
It is mounted so that it can move backwards, and a drill rod is connected to the tip.
Rotating motor, and the rotating motor is moved forward and backward.
And a cylinder for impact inside the outer cylinder.
A piston is provided, and the rear end of the piston is
An air-driven striking device connected to the tip, and the striking device
Has a larger outer diameter than the outer cylinder of the
Drill bit mounted and hit with the piston
And passing through the inside of the drilling rod and the hitting device
The blow air supplied is discharged from the drill bit to repeat
Discharging the powder from the hole drilled through the outer surface of the outer cylinder;
Ground member buried, characterized in that it is configured to
Drilling equipment.