JP2971020B2 - 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 for excavating 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 automatically stops rotation of a screw auger when an auger is added.

[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. 6, a movable platform 30 is disposed movably back and forth along horizontal guide shafts 20 and 21 on a ground platform 10 installed in a hole of a propulsion shaft, and is 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 device, every time a new screw auger 70 is added between the screw auger 70 that has been propelled into the soil and the chuck mechanism 45, the screw auger is moved forward. The operation of separating the auger 70 from the chuck mechanism 45 is performed, and every time the separation operation is performed, the power switch 64 of the electric motor 60 needs to be turned off to stop the rotation of the screw auger 70.

Therefore, not only is the operation of turning on / off the power switch 64 complicated, but there is a risk that the power switch 64 may be forgotten to be turned off with the elapse of the working time. If the operation of separating the screw auger 70 from the mechanism 45 has been performed, there is a possibility that the screw auger 70 may be injured by touching the screw blade of the screw auger 70.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and in particular, by automatically stopping the rotation drive of a screw auger when a screw auger is added, simplification of work and enhancement of safety. It is an object of the present invention to provide a screw auger propulsion device capable of performing the following.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a screw auger of a required length provided by a chuck mechanism provided on a movable table which is movable along a guide shaft on a ground table. Chucking, applying a rotational force to the screw auger by an electric motor driven by electric power from a generator, and propelling into the soil along with the movement of the moving table, and sequentially adding the screw auger. In a screw auger propulsion device for side hole excavation while excavating a side hole, detection means for detecting completion of individual propulsion of the screw auger accompanying movement of the moving table, and continuation of power supply from the generator to the electric motor A foot switch operated when instructing the screw auger, and an individual pushing of the screw auger by the detecting means. Power supply control means for interrupting power supply from the generator to the electric motor when completion is detected, and for continuing power supply to the electric motor when a stepping operation by the foot switch is performed; And characterized in that:

[0011]

According to the screw auger propulsion apparatus for excavating a horizontal hole of the present invention, when the completion of the individual propulsion of the screw auger accompanying the movement of the movable base is detected by the detection means, the power supply control means controls the electric power supply from the generator. In addition to interrupting the power supply to the motor, when the foot switch is operated by a foot switch, the power supply to the electric motor is continued, and the rotation drive of the screw auger is automatically stopped when the screw auger is added. As a result, not only does the on / off operation of the power switch of the electric motor become unnecessary, but also there is no possibility that the screw auger is separated from the chuck mechanism by mistake when the rotation is not stopped. .

[0012]

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 apparatus for excavating a horizontal hole according to the present invention. An anchor having mounting holes 11 at four corners of a grounding table 10 installed in a hole of a vertical shaft for propulsion. The fixing plate 12 is provided integrally. In addition, a foot switch 13 for releasing the ON state of a diaphragm-type pressure switch 22 described later is provided on one side of the grounding table 10. Further, a rack 14 is provided in the middle of the grounding table 10, and the moving table 30 described later is moved forward or backward by meshing with a pinion 54 described later. Furthermore, two guide shafts 20 and 21 are horizontally arranged on the grounding table 10, and a movable table 30 is movably supported by the guide shafts 20 and 21 via a support portion 31. I have.

A diaphragm type pressure switch 2 as a detecting means is provided at one end of one guide shaft 20.
2 is provided, and the moving table 30 moves forward to
When it comes into contact, it turns on.

A drive 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 Rotate.

The chuck mechanism 45 detachably mounts a metal screw auger 70, and can chuck the rear end 71 of the screw auger 70 by opening the locking piece 46 divided into four parts. I can do it. Here, screw auger 70
Has a length of about 30 to 50 cm, and a spiral screw blade 72 is formed along the axial direction. Further, a female screw portion and a male screw portion are formed at the rear end portion 71 and the front end portion 73 (see FIG. 3) of the screw auger 70, and the cutting tip 74 is provided at the front end portion 73 of the leading screw auger 70. (See FIG. 3), and the front end 73 of the next screw auger 70 is attached to the rear end 71 of the screw auger 70.

A drive case 51 having a ratchet mechanism capable of switching between forward (forward side) and reverse (reverse side) rotations of the feed mechanism 50 (not shown) is attached to the movable base 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) or the backward direction.

A power cord 63 for receiving electric power from a generator 80 is connected to the grip 62 of the electric motor 60. The power cord 63 includes the pressure switch 22
As the power supply control means for interrupting the power supply from the generator 80 when the ON signal from the controller 80 is received, and continuing the power supply from the generator 80 when the ON signal from the foot switch 13 is received. A power supply control box 90 is interposed.

The grip 62 is provided with a power switch 64 for manually turning on / off the power supply from the generator 80. At the time of work, the power switch 64 is always turned on. Power supply control to the electric motor 60 is performed by on / off control in a power supply control box 90 interposed in the cord 63.

Further, the power supply control box 90 is connected to a cord 23 for outputting an on / off signal of a pressure switch 22 provided at the end of the guide shaft 20. When the pressure switch 22 is turned on by the contact of the support portion 31, the power supply control box 90 is turned off, and the power supply from the generator 80 is cut off even though the power switch 64 is turned on. It is supposed to be. And the generator 80
When restarting the power supply from the
By stepping on the foot switch 13 provided on one side of the electric motor 0, the power supply control box 90 is turned on, and electric power from the generator 80 is supplied to the electric motor 60 side.

The electric motor 60 may be driven by turning on the power switch 64 of the electric motor 60 at the same time as the foot switch 13 is depressed. In this case, a safer operation is performed. be able to. Also, the power supply control function of the power supply control box 90 can be provided on the power switch 64 side of the electric motor 60. In this case, the power supply control box 90 can be omitted.

As the above-mentioned electric motor 60, it is sufficient to use an electric motor having an output equivalent to that of a drive motor built in a small electric drill generally owned by a pipe construction worker, so that the electric motor 60 cannot be carried around. It can be configured to be easily sized and weighed.

FIG. 2 shows the power supply control box 90 described above.
When an ON signal from the pressure switch 22 is taken in, the control unit 92 holds the ON state in the memory 93, and the power supply control switch 9
1 is turned off. On the other hand, when the ON signal from the foot switch 13 is received, the control unit 9
2 rewrites the on state held in the memory 93 to the off state, and turns the power supply control switch 91 on.

As described later, when the screw auger 70 has been propelled into the soil by such power supply control, the drive of the electric motor 60 is automatically stopped, and the rotation of the chuck mechanism 45 is stopped. , The screw auger 70 that has been propelled into the soil is separated from the chuck mechanism 45, and a new screw auger 7 is inserted between the separated screw auger 70 and the chuck mechanism 45.
Work such as adding 0 can be performed safely.

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. 3, the screw auger propulsion device is carried into the shaft for propulsion, and the anchor 15 is driven into the mounting hole 11 of the anchor fixing plate 12 of the ground stand 10 to fix the ground stand 10 in the shaft. I do. 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 ratchet mechanism (not shown) of the drive case 51 is switched to the reverse (retreat side), and the manual handle 52
Is reciprocated between the directions of arrows A and B, whereby the movable table 30 is retracted away from the excavation point, and the rear end 71 of the screw auger 70 having the cutting tip 74 attached to the tip is attached to the chuck mechanism 45. Then, the power switch 64 of the electric motor 60 is turned on.

As a result, 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, the ratchet mechanism (not shown) of the drive case 51 is switched to the forward (forward) side, and the manual handle 52 is reciprocated between the directions of the arrows A and B to move the moving table 30.
Is gradually moved in the forward direction, 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.

When the leading screw auger 70 has been propelled into the soil, the support 31 of the movable table 30 comes into contact with the pressure switch 22 provided at the end of the guide shaft 20, and the pressure switch 22 is turned on. . This allows
Since the power supply control switch 91 is turned off by the control unit 92 and the power supply from the generator 80 to the electric motor 60 is interrupted, the driving of the electric motor 60 is automatically stopped, and the rotation of the chuck mechanism 45 is stopped. Since the rotation of the screw auger 70 is stopped, the screw auger 70 that has been propelled into the soil can be safely separated from the chuck mechanism 45.

After the screw auger 70 is separated from the chuck mechanism 45, the ratchet mechanism (not shown) of the drive case 51 is switched again to the reverse (retreat side), and the manual handle 5
2 is reciprocated between the directions of arrows A and B to move the movable table 30 backward away from the excavation point.

In this state, as shown in FIG. 4, 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.
The ratchet mechanism is switched to the forward (forward side) again, and the manual handle 52 is reciprocated between the directions of the arrows A and B to move the moving table 3.
0 is gradually advanced, and 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, when the foot switch 13 provided on one side of the ground stand 10 is depressed, the power supply control switch 91 is turned on by the control unit 92 as described above, and the generator 8
Since the electric power from 0 is supplied to the electric motor 60 side, the two screw augers 70 connected by the rotation of the chuck mechanism 45 are simultaneously rotated.

In this state, the manual handle 52 is moved to the direction indicated by the arrow A,
When the movable table 30 is gradually advanced by being reciprocated in the direction B, excavation by the cutting tip 72 of the screw auger 70 is continued, and excavation according to the movement of the movable table 30 is gradually advanced deeper. Thereafter, similarly, as shown in FIG. 5, 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.

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, the movable base 3
When the completion of individual propulsion of the screw auger 70 accompanying the forward movement of 0 is detected by turning on the pressure switch 22, the control unit 92 turns off the power supply control switch 91,
The power supply from the generator 80 to the electric motor 60 is interrupted, and the power supply to the electric motor 60 is continued when the foot switch 13 is operated by the stepping switch 13. Is automatically stopped, so that the on / off operation of the power switch 64 of the electric motor 60 is not only required, and the screw from the chuck mechanism 45 is erroneously stopped when the rotation is not stopped. The work of separating the auger 70 is not performed, and the work is simplified and the safety is improved.

In this embodiment, the pressure switch 2
2 is provided at the end of the guide shaft 20, but the present invention is not limited to this example, and the pressure switch 22 may be provided on the support portion 31 side of the movable base 30, and the diaphragm type pressure switch 22 may be further provided. Alternatively, another mechanical switch having a simple mechanism may be used.

[0037]

As described above, according to the screw auger propulsion device for excavating a horizontal hole of the present invention, when the completion of individual propulsion of the screw auger accompanying the movement of the moving table is detected by the detecting means, the electric power is supplied. While the supply control means interrupts the power supply from the generator to the electric motor,
When the stepping operation by the foot switch is performed, the power supply to the electric motor is continued, and the rotation drive of the screw auger is automatically stopped when the screw auger is added. Not only does the on / off operation become unnecessary, but also the operation of separating the screw auger from the chuck mechanism by mistake when the rotation is not stopped is eliminated, thereby simplifying the operation and improving the safety. be able to.

[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 block diagram showing a control system of the screw auger propulsion device for excavating a side hole shown in FIG. 1;

FIG. 3 is a view for explaining the operation of the screw auger propulsion device for excavating the side hole shown in FIG. 1;

FIG. 4 is a view for explaining the operation of the screw auger propulsion device for excavating a side hole shown in 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 perspective view showing a conventional screw auger propulsion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grounding stand 13 Foot switch 14 Rack 20 and 21 Guide shaft 22 Pressure switch 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 Generator 90 Power supply control box 91 Power supply control switch 92 Control unit 93 Memory

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

Claims (1)

(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, Detection means for detecting completion of individual propulsion of the screw auger accompanying movement of the moving table; a foot switch operated when instructing continuation of power supply from the generator to the electric motor; and When the completion of individual propulsion of the screw auger is detected, the electric motor from the generator is Power supply control means for suspending power supply to the electric motor and continuing power supply to the electric motor when a stepping operation is performed by the foot switch. Screw auger propulsion device.