JP2971019B2 - Screw auger propulsion device for side hole drilling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw auger propulsion device which excavates a horizontal hole for drawing while adding a plurality of screw augers when drawing a small or medium diameter gas pipe or the like into the ground. The present invention relates to a screw auger propulsion device for excavating a horizontal hole, which eliminates burning of a motor.

[0002]

2. Description of the Related Art Conventionally, a screw auger propulsion method has been known as a method of excavating a lateral hole for drawing a small or medium-diameter gas pipe or the like into the ground.

In this method, a propulsion shaft and a reaching shaft are excavated on the ground to be piped, and a screw auger of a required length is sequentially added to the soil by a screw auger propulsion machine installed in a hole of the propulsion shaft. After excavating a horizontal hole of the required diameter up to the reaching shaft, the gas pipe is drawn into the horizontal hole from the side of the reaching shaft, and conversely, the gas pipe is pulled out to the side of the propelling shaft and piped. is there.

As such a screw auger propulsion device, the present inventor has proposed an auger propulsion device having a simple configuration (Japanese Patent Application No. 5-242244). That is,
As shown in FIG. 8, a movable base 30 is disposed movably back and forth along horizontal guide shafts 20 and 21 on a grounding base 10 installed in a hole of a shaft for propulsion, and mounted on a driving unit 40. The rotational force of the screw auger 70 is obtained by the driving force from the electric motor 60 and the manual handle 52
The rack 14 and the pinion 54 of the feed mechanism 50 are engaged with each other by manual operation in the directions of the arrows A and B to feed the movable table 30 in the forward direction (propulsion direction).

When excavating a horizontal hole having a required diameter in the soil, the chuck mechanism 45 provided on the output shaft 44 side of the drive unit 40 and the screw auger 70 are used.
By moving the movable base 3 forward while sequentially adding new screw augers 70 in between, a horizontal hole having a required diameter is excavated in the soil.

[0006]

As described above, the above-described conventional screw auger propulsion device uses the electric motor 60
The rotational force of the screw auger 70 is obtained by the driving force from the motor, and the propulsion force of the screw auger 70 is obtained by manual operation of the manual handle 52 in the directions of arrows A and B. It is not only easy to transport and install the propulsion device because of its small size and light weight, but also to determine the hardness in the soil in response to manually propel the screw auger 70 into the soil. Screw auger 7
In this way, it is possible to prevent the screw auger 70 from being damaged, because the propulsion of the screw auger 70 into the soil can be avoided.

However, in such a screw auger propulsion apparatus, although the screw auger 70 can be manually propelled into the soil and the hardness of the soil can be determined in response, the excavation must be performed. When the ground is hard, the screw auger 70 cuts into the ground, so that excavation by the screw auger 70 is not performed smoothly and a load is applied to the electric motor 60.

In the worst case, the coil of the electric motor 60 may be burned. In such a case, it is necessary to prepare a new electric motor 60.
Since the excavation work is interrupted, there is a problem that the excavation work by the screw auger 70 is prolonged.

[0009] The present invention has been made in view of such circumstances, and it is possible to reliably and quickly perform excavation work using a screw auger regardless of the soil quality of the ground, and to prevent seizure of the electric motor. It is an object of the present invention to provide a screw auger propulsion apparatus for excavating a lateral hole that can be used.

[0010]

According to the first aspect of the present invention,
A screw auger of a required length is chucked by a chuck mechanism provided on a movable table that is movable along a guide shaft on a ground stand, and the screw auger is attached to the screw auger by an electric motor driven by electric power from a generator. In a screw auger propulsion apparatus for excavating a horizontal hole while sequentially adding the screw auger, while applying a rotational force to cause the propulsion into the soil with the movement of the moving table, the current from the generator A current variable section for varying a value, a voltage variable section for varying a voltage value from the generator, and power supply for relatively controlling current (I) -voltage (V) by the current variable section and the voltage variable section. Control means, and when the electric motor is driven at a rated speed, the power supply control means controls the current variable section and the voltage variable section. When the electric motor is driven at a low speed, the current (I) by the voltage variable unit is set lower than the rated value, and the voltage (V) by the voltage variable unit is set lower than the rated value. (V) is controlled to be higher than the rated value.

According to a second aspect of the present invention, the electric power supply control means supplies the electric power by a load applied to the electric motor based on a detection result from a current detection section for detecting a current value supplied to the electric motor. When the current value to be supplied suddenly exceeds the rated value, the power supply to the electric motor is controlled to be stopped.

[0012]

In the screw auger propulsion apparatus for excavating a horizontal hole according to the present invention, the electric motor is driven at a constant speed by relatively controlling the current (I) -voltage (V) to the electric motor by the power supply control means. When the ground is not so hard, the electric motor is driven at the rated speed.When the ground is hard, the electric motor is driven at a low speed. Since the rotation speed of the screw auger is reduced and the screw auger rotates at a low speed, the excavation work proceeds slowly but steadily, and the excavation work by the screw auger is reliably and promptly performed regardless of the soil quality of the ground.

[0013] Even when the ground is hard, the excavation work proceeds slowly but steadily, so that the load on the electric motor is reduced and the load is applied to the electric motor. Even in this case, since the current (I) to the electric motor at the time of low speed is lower than the rated value, occurrence of burn-in of the electric motor can be suppressed.

Further, when the current detector detects that the value of the current supplied to the electric motor suddenly exceeds the rated value, the power supply to the electric motor is stopped by the power supply control means. The occurrence of burn-in of the motor is more reliably suppressed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings described below, the same parts as those in FIG. 6 are denoted by the same reference numerals.

FIG. 1 shows an embodiment of a screw auger propulsion device for excavating a horizontal hole according to the present invention. An anchor having mounting holes 11 at four corners of a grounding stand 10 installed in a hole of a vertical shaft for propulsion. The fixing plate 12 is provided integrally. A rack 14 is provided in the middle of the grounding table 10, and the moving table 30 is moved forward by meshing with a pinion 54 described later. Furthermore,
Two guide shafts 20, 21 are horizontally arranged on the ground stand 10.
A movable table 30 is movably supported by a support member 1 via a support portion 31.

A driving unit 40 having a speed reduction mechanism constituted by a worm gear or the like (not shown) is mounted on the moving table 30. The drive unit 40 is provided with a square hole-shaped fixing frame 41 for fixing the electric motor 60. A vertical drive shaft 43 having a square hole-shaped insertion port 42 into which a square shaft 61 of an electric motor 60 is inserted at the center lower portion of the fixed frame 41.
When the square shaft 61 rotates with the square shaft 61 inserted into the insertion port 42, the chuck mechanism 45 attached to the output shaft 44 of the reduction mechanism (not shown) via the vertical drive shaft 43. Rotates.

The chuck mechanism 45 is for detachably attaching a metal screw auger 70, and opens the locking piece 46 divided into four parts to open the screw auger 70.
After attaching the rear end 71 of the screw auger 70, the rear end 71 of the screw auger 70 can be chucked by closing the locking piece 46.

Here, the length of the screw auger 70 is approximately 30 to 50 cm, and a spiral screw blade 72 is formed along the axial direction. Also, the rear end 71 and the front end 73 of the screw auger 70 (see FIG. 5).
Has a female screw part and a male screw part, respectively,
A cutting tip 74 (see FIG. 5) is attached to the leading end 73 of the leading screw auger 70, and the leading end 73 of the next screw auger 70 is attached to the trailing end 71 of the screw auger 70. ing.

A drive case 51 of a feed mechanism 50 having a ratchet mechanism is attached to the movable table 30. A manual handle 52 is attached to the drive case 51 so as to be rotatable in the directions of arrows A and B. The manual handle 52 is connected to the ratchet mechanism of the drive case 51 by rotating the manual handle 52 in the directions of arrows A and B. The pinion 54 attached to the rotating shaft 53 is engaged with the rack 14 on the grounding table 10 side, and sends the moving table 30 in the forward direction (propulsion direction).

As shown in FIG. 2, the drive case 51 is rotatable in the directions of arrows a and b around a rotation shaft 55 provided on the movable table 30, as shown in FIG. Then, by rotating the drive case 51 in the direction of arrow a, the pinion 54 is separated from the rack 14 on the ground stand 10 side, and the rack 14 and the pinion 54 are disengaged. It can be sent in the reverse direction.

A power switch 64 is provided on the grip 62 of the electric motor 60, and a power cord 63 for receiving power supply from the generator 80 is connected to the grip 62.
The generator 80 is connected to the power cord 63 via a power supply control box 90.

Further, the power supply control box 90 is connected to the cord 23 drawn from the drive unit 40, and detects the rotational speed of the vertical drive shaft 43 into which the square shaft 61 of the electric motor 60 is inserted, for example. By doing
The rotation speed of the electric motor 60 is detected. Then, when the rotation speed of the electric motor 60 becomes zero, the power supply from the generator 80 is cut off.

It should be noted that since the electric motor 60 having an output equivalent to that of a drive motor built in a small electric drill generally owned by a pipe construction worker is sufficient, the electric motor 60 cannot be carried around. It can be configured to be easily sized and weighed.

FIG. 4 shows the power supply control box 90 described above.
It shows the details. As shown in the figure, the power supply control box 90 is provided with a changeover switch 91 for switching the electric motor 60 to a rated speed or a low speed.

The current variable section 94 and the voltage variable section 95 variably set the current (I) -voltage (V) of the electric power supplied from the electric power supply control section 96.
When 1 is switched to the rated speed side, the control section 92 controls the current (I) in the current variable section 94 and the voltage variable section 95.
-Control is performed so that the set values of the voltage (V) are rated.

On the other hand, when the changeover switch 91 is switched to the low speed side, the control section 92 controls the current (I) in the current variable section 94 to be lower than the rated value, and the voltage (voltage) in the voltage variable section 95 is controlled. The set value of V) is controlled to be higher than the rating. However, the variable setting in the current variable section 94 and the voltage variable section 95 in this case is as follows.
Power (Pmax) from power supply control unit 96 at rated speed
Is controlled to be the same as

The current detector 93 serves as a protection circuit. The current supplied from the power supply controller 96 to the electric motor 60 suddenly exceeds the rated value due to the load applied to the electric motor 60. In this case, the control unit 92 stops the power supply from the power supply control unit 96 to the electric motor 60.

By such power supply control, the rotation speed of the electric motor 60 is reduced.
(Pmax) is the same as at the rated speed, the output of the electric motor 60 is the same as at the rated speed even at the low speed, and when the ground is hard, the screw auger 70 is turned off. By rotating at low speed,
Excavation work is progressed gradually. Further, when the ground is hard or the like, the excavation by the screw auger 70 is not performed smoothly, and even when a load is applied to the electric motor 60, the electric current ( Since I) is lower than the rated value, occurrence of burn-in of the electric motor 60 is suppressed. Further, the current detection unit 93 serving as a protection circuit detects the state of the current flowing into the electric motor 60, and when the current suddenly exceeds the rated value, the electric motor 6
Since the supply of electric power to 0 is stopped, the occurrence of burn-in of the electric motor 60 is reliably suppressed.

Next, an excavation method using the screw auger propulsion device having the above configuration will be described with reference to FIGS.

First, as shown in FIG. 5, a screw auger propulsion device is carried into a shaft for propulsion, and an anchor 15 is driven into a mounting hole 11 of an anchor fixing plate 12 of the grounding stand 10 so that the grounding stand 10 is moved upright. Fix inside. At the same time, after setting the electric motor 60 on the fixed frame 41 of the driving unit 40 and connecting the cord 23, the power cord 63, and the power supply control box 90 connected to the above-described generator 80, Then, the generator 80 is started.

Next, the drive case 51 is rotated in the direction of arrow a. As a result, the pinion 54 is separated from the rack 14 on the ground stand 10 side, so that the rack 14 and the pinion 5
4 and the movable table 30 can be moved by hand. Then, the moving table 30 is retracted away from the excavation point, and as shown in FIG.
After the rear end 71 of the screw auger 70 to which the screw 4 is attached is attached to the chuck mechanism 45, the power switch 64 of the electric motor 60 is turned on.

Thus, the vertical drive shaft 43 is rotated by the rotation of the square shaft 61 of the electric motor 60, and the screw auger 7 chucked by the chuck mechanism 45 is rotated.
0 rotates.

In this state, when the drive case 51 is turned in the direction of arrow b to engage the pinion 54 with the rack 14 and the manual handle 52 is turned back and forth between the directions of arrows A and B, a ratchet mechanism (not shown) is provided. The moving table 30 is gradually moved in the forward direction by the action of. At the same time, excavation is started by the cutting tip 74 of the screw auger 70, and excavation and excavation of the excavated soil by the screw blade 73 of the screw auger 70 are gradually advanced.

At this time, the hardness of the ground can be determined by responding to moving the movable base 30 forward with the manual handle 52. If the ground is not so hard, the changeover switch 91 of the power supply control box 90 is set to the constant speed side. , The electric motor 60 drives at a constant speed, and the excavation work by the screw auger 70 is performed smoothly.

On the other hand, when the ground is hard, when the changeover switch 91 of the power supply control box 90 is switched to the low speed side, the rotation speed of the electric motor 60 is reduced, and the excavation by the screw auger 70 and the cutting tip 74 is gradually performed. However, it will definitely proceed.

At this time, even if the excavation by the screw auger 70 is not performed smoothly and a load is applied to the electric motor 60, the current (I) to the electric motor 60 at low speed is Since the value is lower than the rated value as described above, the occurrence of burn-in of the electric motor 60 is suppressed. In addition, the state of the current flowing into the electric motor 60 is detected by the current detecting unit 93 serving as a protection circuit. When the current suddenly exceeds the rated value, the power supply to the electric motor 60 is stopped. As a result, the occurrence of burn-in of the electric motor 60 is reliably suppressed.

When the leading screw auger 70 has been propelled into the soil, the power switch 64 is turned off to stop driving the electric motor 60, whereby the rotation of the chuck mechanism 45 is stopped, and the screw auger 7 is stopped.
Since the rotation of the screw auger 70 is stopped, the screw auger 70 that has been propelled into the soil is separated from the chuck mechanism 45.

After the screw auger 70 is separated from the chuck mechanism 45, the drive case 51 is again rotated in the direction of the arrow a to disengage the rack 14 and the pinion 54, and the movable table 30 is manually moved from the excavation point. Retreat away.

In this state, as shown in FIG. 6, the tip 73 of the next screw auger 70 is screwed into the rear end 71 of the screw auger 70 left in the soil.
After the drive case 51 is rotated again in the direction of arrow b to engage the pinion 54 with the rack 14, the manual handle 52 is rotated back and forth between the directions of arrows A and B to gradually advance the movable table 30. Then, the rear end 71 of the next screw auger 70 is chucked by the chuck mechanism 45.

Here, the diameter of the screw blade 72 of the next screw auger 70 added to the first screw auger 70 is smaller than that of the first screw auger 70.

After the chucking of the screw auger 70 is completed, the manual handle 52 is reciprocated between the directions of the arrows A and B to gradually advance the movable table 30, and excavation by the cutting tip 72 of the screw auger 70 is started. The excavation is continued, and the excavation according to the movement of the movable base 30 is gradually advanced deeply. Thereafter, similarly, as shown in FIG. 7, every other screw auger 70 having a small diameter of the screw blade 72 is propelled through the soil while being added.

Thus, every other screw blade 72
As the inventor has already proposed (Japanese Patent Application No. 6-2124), the contact surface of the excavated lateral hole with the inner wall soil surface is reduced by adding the screw auger 70 having a small diameter. Since the frictional force is also reduced, the excavation work is performed with the propulsion resistance applied to the screw auger 70 reduced. Then, the excavated soil propelled by the leading screw auger 70 is sent out by the subsequent screw auger 70 and a continuous horizontal hole is excavated while reaching the reaching shaft.

As described above, in the present embodiment, by relatively controlling the current (I) -voltage (V) to the electric motor 60, the driving of the electric motor 60 is switched between the constant speed and the low speed, Is not so hard, the electric motor 60 is driven at the rated speed.
Is driven at a low speed, especially when the ground is hard, the rotation speed of the electric motor 60 is reduced, and the screw auger 70 rotates at a low speed, so that the excavation work proceeds gradually, Excavation work by the screw auger 70 is performed reliably and promptly regardless of the soil quality of the ground.

Even when the ground is hard, the electric motor 60
The current (I) to the electric motor 60 at the time of low speed is lower than the rated value even when the load on the electric motor 60 is reduced and the load is applied to the electric motor 60. In addition, the occurrence of burn-in of the electric motor 60 is suppressed.

Further, when the current detector 93 detects that the current value supplied to the electric motor 60 suddenly exceeds the rated value, the power supply to the electric motor 60 is stopped. The occurrence of burning is more reliably suppressed.

In this embodiment, the case where the rotation speed of the electric motor 60 is switched between the rated speed and the low speed in accordance with the soil characteristics of the ground on which the excavation work is performed by the switching operation by the changeover switch 91 has been described. However, the present invention is not limited to this example. When the rotation speed of the electric motor 60 decreases during the excavation work, the electric current value may be automatically reduced and the voltage may be increased to shift the electric motor 60 to a low speed.

[0048]

As described above, according to the screw auger propulsion apparatus for excavating a horizontal hole of the present invention, the current (I) -voltage (V) to the electric motor is relatively controlled by the power supply control means. By switching the driving of the electric motor between constant speed and low speed, if the ground is not so hard, the electric motor is driven at the rated speed, and if the ground is hard, the electric motor is driven at a low speed. Therefore, especially when the ground is hard, the rotation speed of the electric motor is reduced and the screw auger rotates at a low speed, so the excavation work progresses gradually but regardless of the soil quality of the ground. Can be performed reliably and promptly.

Further, even when the ground is hard, the excavation work is progressed, though gradually, so that the load on the electric motor is reduced and the load is applied to the electric motor. Even in this case, since the current (I) to the electric motor at the time of low speed is lower than the rated value, occurrence of burn-in of the electric motor can be suppressed.

Further, when the current detector detects that the current value supplied to the electric motor suddenly exceeds the rated value, the power supply to the electric motor is stopped by the power supply control means. The occurrence of burn-in of the motor is more reliably suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a screw auger propulsion device for excavating a horizontal hole according to the present invention.

FIG. 2 is a cross-sectional view showing a state where a rack and a pinion of the feed mechanism of FIG. 1 are engaged with each other.

FIG. 3 is a cross-sectional view showing a state where the rack and the pinion of the feed mechanism of FIG. 2 are disengaged.

FIG. 4 is a block diagram showing details of a power supply control box of FIG. 1;

FIG. 5 is a view for explaining the operation of the screw auger propulsion device for excavating the side hole of FIG. 1;

FIG. 6 is a view for explaining the operation of the screw auger propulsion device for excavating the side hole shown in FIG. 1;

FIG. 7 is a view for explaining the operation of the screw auger propulsion device for excavating the side hole of FIG. 1;

FIG. 8 is a perspective view showing a conventional screw auger propulsion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grounding stand 14 Rack 20 and 21 Guide shaft 30 Moving table 31 Support part 40 Drive part 41 Fixed frame 45 Chuck mechanism 51 Drive case 52 Manual handle 54 Pinion 60 Electric motor 61 Square shaft 70 Screw auger 72 Screw blade 74 Cutting tip 80 Power generation Machine 90 power supply control box 91 selector switch 92 control unit 93 rotation speed detection unit 94 current detection unit 95 voltage variable unit 96 current variable unit 97 power supply control unit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 7/04 E21B 7/00

Claims (2)

(57) [Claims] 1. An electric motor driven by electric power from a generator by chucking a screw auger of a required length by a chuck mechanism provided on a movable table movable along a guide shaft on a grounding table. In the screw auger propulsion device for horizontal hole excavation, which applies a rotational force to the screw auger to cause the screw auger to be propelled into the soil with the movement of the moving table and excavates a horizontal hole while sequentially adding the screw auger, A current variable section that varies a current value from the generator; a voltage variable section that varies a voltage value from the generator; and a current (I) -voltage (V) relative to the current variable section and the voltage variable section. When the electric motor is driven at a rated speed, the power supply control means controls the current variable. And when the electric motor is driven at a low speed, the current (I) by the current variable unit is made lower than the rated value, and the voltage (V) is set to a value lower than the rated value. A screw auger propulsion device for excavating a horizontal hole, wherein a voltage (V) by a variable portion is controlled to be higher than the rated value. 2. The electric power supply control means according to claim 1, wherein a current value supplied by a load applied to said electric motor is rated based on a detection result from a current detection unit for detecting a current value supplied to said electric motor. If it suddenly exceeds the value,
The screw auger propulsion device for excavating a horizontal hole according to claim 1, wherein the power supply to the electric motor is controlled to be stopped.