JP2532385Y2 - Kerry Love Direction Correction Device - Google Patents

Description

[Detailed description of the invention] << Industrial application field >> The present invention relates to an apparatus for correcting the direction of a kerry club used for underground excavation.

<Conventional technology> In a conventional kelly glove, a kelly glove is detachably attached to a lower end of a rod-shaped support member called a kelly bar through a fastening member such as a joint bolt, and the shell of the kelly glove is opened and closed. This excavates the ground with this shell.

In addition, underground excavation using the above-mentioned Kelly rub is suitable for excavating a deep trench, and by pouring a self-hardening stabilizer such as cement into the excavated deep trench, as a retaining wall when this is hardened. Can work.

By the way, in the above Kelly Club, when excavating a deep trench,
At the corners of the deep groove or the like, it is necessary to change the opening / closing direction of the shell to a right angle direction or a predetermined angle, but conventionally, the mounting position of the Kelly bar and the Kelly club is adjusted again.

《Problem to be solved by the invention》 However, in such a conventional Kelly Club, in order to change the direction of the shell, the mounting position of the Kelly Bar and the Kelly Club is modified as described above,
In order to correct the mounting position in this way, it is necessary to remove the joint bolt once, change the Kelly Club to the desired direction, and then mount the joint bolt again.

For this reason, the direction correction of the Kelly Club has to rely on input, and especially, the joint bolt is usually 10 to 12
Since the number of books is large and the Kelly Club is quite heavy, this correction work becomes extremely difficult, and a lot of time is required for this direction correction, and the construction period is lengthened accordingly. was there.

In view of such a conventional problem, an object of the present invention is to provide a direction correction device for a kerry club that can be performed easily and in a short time without relying on human power to correct the direction of the kerry club. I do.

<< Means for Solving the Problems >> In order to achieve this object, the present invention provides a kelly bar which is attached to the lower end of a kelly bar and performs underground excavation by opening and closing a shell. The turning mechanism is provided with a worm wheel, the center axis of which is arranged in the vertical direction, and a worm wheel attached to one of Kelly Bar or Kelly Club, and meshed with the worm wheel,
Attached to the other of Kelly Bar or Kelly Club,
The worm includes a pair of worms opposed to each other with the central axis interposed therebetween, and a driving device that rotates the worm. Further, the turning mechanism has a tilt mechanism that makes a tilt angle of the Kelly Club variable.

<< Operation >> With the above configuration, in the direction correcting device for the Kelly Club of the present invention, a turning mechanism is interposed between the Kelly Bar and the Kelly Club, and the turning mechanism is arranged with the center axis in the vertical direction. Or a worm wheel attached to one of the kerry clubs, a worm meshed with the worm wheel, the central axis of which is arranged in the horizontal direction, and a worm attached to the other of the kelly bar or the kerry club, and a drive device for rotating the worm. And
The adoption of a worm mechanism as the rotating mechanism of the Kelly Club and the fact that a pair of worms are opposed to each other with the central axis interposed therebetween, so that the couple can be used, so that the weight of the worm can be reduced by the small rotating force of the worm. In addition to being able to rotate a certain kerry club, a pair of worms can be rotated stably because they are opposed to each other across the central axis, and the direction of this kerry club is temporarily corrected and the drive unit is stopped. After that, the natural rotation of the Kelly Club is reliably prevented by the meshing relationship between the worm wheel and the worm.

<< Example >> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of the kerry club 12 provided with the direction correcting device 10 of the present invention. FIG. 1 is an overall view of the kerry club 12, FIG. 3 is a cross-sectional plan view of a main part, and FIG. 4 is a side view of the main part showing one operation state.

That is, as shown in FIG. 1, the kelly club 12 of this embodiment is attached to the lower end of a vertically extending kelly bar 14, and the lower end of the kelly bar 12 has pins 16 and 1 attached thereto.
A pair of shells 18, 18a that are opened and closed about 6a are provided.

The shells 18 and 18a are driven to open and close via a hydraulic cylinder (not shown), and are closed when the respective shells 18 and 18a are rotated downward from an open state shown in the figure.

Therefore, the ground can be excavated by closing the shells 18 and 18a, and the excavated earth and sand is carried out to the ground with the shells 18 and 18a closed, and the shell 18 is excavated. , 18a release earth and sand.

Then, by repeating this operation, a deep groove along the opening and closing direction of the shells 18, 18a is excavated on the ground.

Here, in the present embodiment, a turning mechanism 20 is interposed between the Kelly bar 14 and the Kelly lab 12, and the Kelly lab 12 can be rotated around a vertical rotation axis via the turning mechanism 20. It has become.

That is, as shown in FIGS. 2 and 3, the turning mechanism 20 is provided with an upper mounting seat 22 mounted on the lower end of the kelly bar 14 and a lower mounting seat 24 mounted on the upper end of the kelly bar 12. A central shaft body 26 is fixed below the upper mounting seat 22 via bolts 28, and a frame 32 is mounted above the lower mounting seat 24 via a tilting mechanism 30.

The frame body 32 is fitted outside the central shaft body 26, and the central shaft body 26 and the frame body 32 are rotatable relative to each other.

The central axis body 26 has its central axis arranged in the vertical direction,
A worm wheel 36 is coaxially fixed below the center shaft 26 via a bolt 34.

The worm wheel 36 is meshed with a pair of worms 38, 38a whose central axes are horizontally arranged at opposite positions on both sides of the worm wheel 36, respectively.
Is supported for rotation.

Hydraulic motors 40 and 40a as driving devices are mounted on both sides of the frame 32. The rotation of the hydraulic motors 40 and 40a is controlled by the worm 38 via output gears 42 and 42a and input gears 44 and 44a. , 38a.

The tilting mechanism 30 includes a plate 48 fixed to the lower side of the frame body 32 via bolts 46, and a pair of first vertically The brackets 50, 50a are fixedly provided, and second brackets 52, 52a are provided on the upper peripheral portion of the lower mounting seat 24 so as to stand on both sides of the first brackets 50, 50a.

And the first bracket 50, 50a and the second bracket
Clevis pins 54, 54a are rotatably fitted between 52, 52a, and the plate 48 and the lower mounting seat 24 are relatively rotatable about the clevis pins 54, 54a.

In addition, the first bracket 50, 50a and the second bracket
The central axes of the clevis pins 54, 54a are provided by disposing 52, 52a in a direction facing the pair of shells 18, 18a.
It is arranged so as to pass through an extension of the center axis of the center rotating body 26 and at right angles to the rotation axes of the shells 18 and 18a.

A pair of jack bolts 56, 56a are provided between the plate 48 and the lower mounting seat 24 in a direction perpendicular to the direction in which the clevis pins 54, 54a face each other.

The jack bolts 56, 56a are screwed into bolt receivers 58, 58a fixed to the lower mounting seat 24, and the bolt heads 60, 60a are in contact with the lower surface of the plate 48, and The jack positions of these jack bolts 56, 56a are fixed via lock nuts 62, 62a.

With the above configuration, in the direction correction device of the kelly club of this embodiment, the hydraulic motors 40 and 40a are operated to warm
When the worms 38, 38a are rotated, the worms 38, 38a and the worm wheel 36 are relatively rotated, so that the central shaft 26
And the frame 32 can be relatively rotated.

At this time, since the center shaft body 26 is attached to the Kelly bar 14 side and the frame body 32 is attached to the Kelly club 12 side, the direction of the Kelly club 12 is changed with the operation of the hydraulic motors 40 and 40a. Can be done.

Therefore, by switching the kelly club 12 in this manner, the opening and closing directions of the shells 18 and 18a can be corrected, and the corners and bent portions of the deep groove can be excavated.

As described above, in the present embodiment, the direction of the Kelly Club 12 is corrected through the turning mechanism 20 including the worms 38 and 38a, the worm wheel 36, and the hydraulic motors 40 and 40a. The direction of the Kelly Club 12 can be automatically and quickly corrected without relying on human power.

Further, in the turning mechanism 20, since the worms 38 and 38a and the worm wheel 36 are meshed with each other, the worm wheel 36 is easily rotated with respect to the rotation of the worms 38 and 38a. , This worm wheel 36
The rotation is reliably prevented by the worms 38, 38a from the rotational force input to the motor, that is, the rotational force input to the kelly club 12, so that the natural rotation of the kelly club 12 is prevented.

For this reason, no special braking means is required between the center shaft body 26 and the frame body 32 for fixing the Kelly club 12.

In the present embodiment, the frame 32 and the lower mounting seat
Since the tilt mechanism 30 was provided between the
By rotating the pair of jack bolts 56, 56a in the opposite directions, the plate 48 and the lower mounting seat 2 around the clevis pins 54, 54a as shown by the two-dot chain line in FIG.
4 can be relatively inclined (inclination angles θ1, θ2).

Therefore, to incline Kerry Club as before,
Corrected excavation can be easily performed without the hassle of performing shim adjustment.

Note that, in the present embodiment, the case where a pair of worms 38 and 38a are meshed with the worm wheel 36 to constitute the turning mechanism 20 is disclosed, but one or three or more worms may be used. However, the use of a plurality of pieces can stabilize the rotation.

<< Effects of the Invention >> As described above, in the direction correcting device for the kerry club according to the first aspect of the present invention, a turning mechanism is interposed between the kelly bar and the kelly club, and the turning mechanism is provided through the turning mechanism. Since the direction of Kerry Club has been corrected,
The use of a worm mechanism as the rotating mechanism of the Kelly Club, and the fact that a pair of worms are opposed to each other with the central axis interposed therebetween, so that their couple can be used, combined with a small rotating force of the worm and a heavy body It is possible to rotate a certain Kelly Club, and because a pair of worms are opposed to each other across the central axis, stable rotation can be performed. And the construction period of underground excavation can be greatly reduced.

Further, in claim 2 of the present invention, the turning mechanism, a worm wheel attached to one of the Kelly Bar or Kelly Club, a worm meshed with the worm wheel, attached to the other of the Kelly Bar or Kelly Club, Since the driving device for rotating the worm is provided, the power for correcting the direction can be reduced, so that the driving device can be reduced in size. In addition, the natural rotation of the Kelly Club can be reliably prevented. There are various excellent effects that the brake means for fixing the grab to the kelly bar can be eliminated.

[Brief description of the drawings]

FIG. 1 is an overall view showing one embodiment of a kerry club provided with a direction correcting device according to the present invention, FIG. 2 is a longitudinal sectional front view of an essential part showing one embodiment of a direction correcting device according to the present invention, and FIG. The figure is a cross-sectional plan view of the main part taken along the line AA in FIG. 2, and FIG. 4 is a side view of the main part showing one operation state of the present invention. 10: Direction correcting device, 12: Kelly club 14: Kelly bar, 18, 18a: Shell 20: Revolving mechanism, 26: Central shaft 30: Tilting mechanism, 32: Frame 36: Warm Wheel 38,38a… worm 40,40a… hydraulic motor (drive unit) 56,56a… jack bolt

Claims (2)

(57) [Scope of request for utility model registration] A kelly bar attached to a lower end portion of a kelly bar and excavating underground by opening and closing a shell, comprising a turning mechanism interposed between the kelly bar and the kelly bar, wherein the turning mechanism comprises: A worm wheel whose central axis is arranged in the up-down direction and is attached to one of the kelly bar or the kelly club, and a pair of gears that are meshed with the worm wheel and are attached to the other of the kelly bar or the kerry rub and opposed to each other with the central axis therebetween. A worm and a driving device for rotating the worm. 2. The apparatus according to claim 1, wherein said turning mechanism has a tilt mechanism for changing a tilt angle of said Kelly Club.