JP2001164867A - Excavation device for earth drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavation device for an earth drill having no possibility of to breaking a hydraulic device in conducting the expanding work of the bottom area of a vertical hole and fittable to a relatively small earth drill. SOLUTION: This excavation device is provided with a blade-like excavation section 322 opened by the depressing force of an earth drill work machine 400 and the reaction from the hole bottom. The excavation section 322 is provided with a cutting edge 326 toward the rotating direction of the earth drill, and the wall face of the vertical hole around the hole bottom is drilled to expand the bottom area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for an earth drill, and more specifically, to an earth drill used in an earth drill method, which is a type of a cast-in-place pile method, attached to the tip of a kelly bar and drilled on the ground. TECHNICAL FIELD The present invention relates to an excavator for excavating a wall surface around a bottom of a vertical hole to enlarge (or expand) the bottom area of the hole.

[0002]

2. Description of the Related Art Conventionally, in the earth drilling method, a drilling device for drilling a vertical hole is generally used as a drilling device.
An earth drill working machine equipped with a bucket is used. After drilling the vertical hole, concrete is filled into the vertical hole to complete a cast-in-place pile.

[0003] In order to increase the durable load of the cast-in-place pile, it is preferable to increase the bottom area of the vertical hole, and when the bottom area is increased, it is necessary to reduce the amount of concrete and excavated soil used. Since it is preferable to excavate the wall surface around the bottom of the hole, recently, a drilling device that enlarges the bottom area by opening and closing a portion for excavating the wall surface with a hydraulic cylinder after arrival at the bottom of the vertical hole has been used. .

[0004]

In a conventional hydraulic excavator, if the hydraulic cable is damaged during the work of enlarging the hole bottom area, in the worst case, the apparatus itself may be lifted from the hole bottom. It became difficult and there was an inconvenience that the foundation pile driving process was greatly delayed.

Generally, there are many types of earth drill working machines having different sizes and outputs according to the use environment and purpose. The above-described conventional drilling device uses a hydraulic mechanism for opening and closing the drilling unit, and thus can be used only in an earth drill capable of mounting a plurality of hydraulic units. That is, an earth drill generally has a hydraulic unit for driving a kelly drive, but since the earth drilling rig according to the prior art is hydraulically operated, an additional hydraulic unit has to be installed. Further, it can be used only for a relatively large earth drill.

Accordingly, a first object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a drilling device for an earth drill that opens and closes a drilling portion without using a further hydraulic device. is there.

A second object of the present invention is to provide a drilling device for an earth drill that can be used in a relatively small earth drill.

[0008]

In order to achieve the above object, a drilling device for an earth drill according to the present invention is defined in claim 1.
Item, in a drilling device for an earth drill, which is attached to a lower end of a kelly bar of an earth drill, and has a body member and an openable and closable digging portion to enlarge a bottom area of a vertical hole, wherein the digging portion includes the earth. It is configured to operate according to the pushing force transmitted from the drill and the reaction force of the pushing force. Accordingly, it is possible to provide a drilling device that opens and closes a drilling unit without using a hydraulic device for opening and closing the drilling unit, and to provide a drilling device that can be mounted on a relatively small earth drill working machine. it can.

Further, in the present invention, the main body member has a cylindrical shape, and the digging portion is configured to be a part of the cylindrical shape. This allows the drilling rig to quickly reach the bottom of the hole, in addition to the effects described above.

Further, according to claim 3, the pressing force is transmitted through a pressing force transmitting means movable in a longitudinal direction of the cylindrical shape inside the main body member,
The said pushing-down force was comprised so that it might be converted into the force of the direction which opens the said excavation part. Accordingly, it is possible to provide a drilling device that opens and closes a drilling unit without using a hydraulic device for opening and closing the drilling unit, and efficiently converts a pressing force of an earth drill into a force required for operation of the drilling unit. Can be.

Further, in the present invention, the excavating portion can be opened and closed with an axis in the main body member parallel to the central axis of the main body member in the longitudinal direction being a center line. This makes it possible to provide a drilling device that opens and closes a drilling unit without using a hydraulic device for opening and closing the drilling unit, and reduces the pressing force of an earth drill to the force required for the operation of the drilling unit more efficiently. While being able to convert, the drilling rig can quickly reach the bottom of the hole.

[0012] Further, in the present invention, the excavating section is provided with a plurality of cutting members such that tips thereof protrude in the excavating rotation direction of the main body member. Accordingly, it is possible to provide a drilling device that opens and closes the excavation unit without using a hydraulic device for opening and closing the excavation unit, and it is possible to perform excavation work efficiently.

[0013] Further, in claim 6, the pressing force transmitting means includes a groove provided in the cylindrical longitudinal direction at a portion other than the excavated portion of the main body member, and the cylindrical longitudinal direction of the main body member. A connection member that is connected to the lower end of the kelly bar on the longitudinal center axis near the upper portion, and that is connected to the connection member that is movable in the longitudinal direction along the groove portion; A first shaft portion having a hollow portion,
A push-down force transmission member integrally provided around the first shaft portion, one end of which is inserted into the first shaft portion;
A second shaft portion that is configured to be movable in the longitudinal direction in a range up to near the lower end of the main body member, and is provided at an appropriate position in the cylindrical shape to lock the lower end of the second shaft portion. And a bearing part. This makes it possible to provide a drilling device that opens and closes a drilling unit without using a hydraulic device for opening and closing the drilling unit, and reduces the pressing force of an earth drill to the force required for the operation of the drilling unit more efficiently. Can be converted.

Further, according to claim 7, the push-down force transmitting means and the excavating portion have ends movable at both ends about two intersecting axes, and between the ends,
It is configured to be connected to the pressing-down force transmitting member by a pressing-down force converting unit that is rotatable in the torsional direction. This makes it possible to provide a drilling device that opens and closes a drilling unit without using a hydraulic device for opening and closing the drilling unit, and reduces the pressing force of an earth drill to the force required for the operation of the drilling unit more efficiently. Can be converted.

Further, in the present invention, the main body member is provided with a lid portion which is attached to the bottom of the main body so as to be openable and closable. Thus, it is possible to provide a drilling device that opens and closes a digging portion without using a hydraulic device for opening and closing the digging portion, and it is possible to more efficiently perform a digging operation.

According to a ninth aspect of the present invention, a digging auxiliary member is provided at a lower end of the digging portion. As a result, it is possible to prevent the excavated portion from being damaged and to enhance the excavating ability.

According to a tenth aspect of the present invention, the groove is provided with a notch for suppressing the vertical movement of the connecting member. Thereby, the excavation amount can be controlled with high accuracy.

In the eleventh aspect, a detecting means for detecting a position of the pressing force transmitting member is provided inside the cylindrical shape of the main body member.
This allows the worker to detect the current opening degree of the excavation part.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a drilling device for an earth drill according to an embodiment of the present invention.

First, in order to facilitate understanding of a drilling device for an earth drill according to one embodiment of the present invention, first, a drilling device for a hydraulic ground drill according to the prior art, more specifically, a grounding device, The configuration and operation of a conventional hydraulic drilling device for an earth drill, which is used for a conventional drilling machine for enlarging a hole bottom area, will be described.

FIG. 1 is a side view sectional view of a conventional hydraulic digging apparatus 100, FIG. 2 is a perspective view of a top view of the conventional hydraulic digging apparatus, and FIG. 3 is a comparatively large-sized conventional digging apparatus equipped with a plurality of hydraulic units. It is explanatory drawing attached to the earth drill working machine.

The conventional hydraulic excavator 100 is mainly composed of a substantially cylindrical main body 102 as shown in FIG. 1 and FIG. 2 which is a sectional view taken along the line II-II of FIG. On the upper part of the main body 102, a socket mounting base 104 closed like a lid in the diameter direction of the main body 102 is installed. The center position of the socket mount 104, that is, the hydraulic excavator 100
A socket 106 is provided on the upper surface at the center of rotation of the earth drill, and is attached to a lower end of a kelly bar (shown in FIG. 3) of an earth drill working machine as described later. Both are provided with pin holes 107 that match each other at the time of insertion, and are fixed by pins (not shown).

A shaft 110 is formed immediately below the center of rotation of the socket mount 104 in the vertical direction, and a cylinder mount 11 is provided near the socket mount of the shaft 110.
2, an opening / closing cylinder mechanism 114 that expands and contracts by hydraulic pressure is attached so as to face the center axis of the shaft 110 by 180 °.

The cylinder mechanism 1 for opening and closing the shaft 110
Below the 14, a thruster 118 that can move up and down along a slide guide 116 is provided.

A link 120 is attached below the thruster 118 at a position 180 ° opposite to the central axis in the longitudinal direction of the main body (the vertical direction in FIG. 1). The link 120 has a connection mechanism rotatable about two orthogonal axes at upper and lower ends, and a connection mechanism rotatable about the axis of the link (not shown) is provided at an appropriate position in an intermediate portion of the link. At the same time, the upper end (connection mechanism) of the link 120 is attached below the thruster 118.

The lower end of the link 120 is attached to an appropriate position of a digging part 122 which forms a part of the cylindrical shape.

The excavating section 122 is provided with an appropriate number of cutting blades 124 in the excavating rotation direction as shown in the figure, and is configured to be openable and closable about the hinge by a hinge 126. An opening / closing lid 128 that can be opened / closed by an appropriate opening / closing mechanism is provided on the bottom surface of the main body 102.

Next, the operation of expanding the bottom of the conventional hydraulic excavator 100 will be described with reference to FIG.

The hydraulic excavator 100 having the above configuration
A vertical hole drilled to a predetermined position of the support layer by an earth drill working machine 200 equipped with a known drilling bucket (not shown) is replaced with a drilling bucket.
It is mounted and inserted into an earth drill working machine 200 provided with a second hydraulic unit (not shown).

The earth drill working machine 200 used here includes an upper rotating body 202, a boom 204, a kelly rope 206, and a kelly bar 210, and a kelly drive 2 for applying a rotational force to the kelly bar 210.
14 is provided. The hydraulic drilling device 100 is mounted on the tip of the kelly bar of the earth drill working machine 200 and has a vertical hole 216.
The inside of the vertical hole is lowered until it reaches the bottom of the hole (not shown).

In order to use the hydraulic type earth drilling rig 100 according to the prior art, an earth drill 20 is required.
A second hydraulic unit (not shown) is mounted at an appropriate position of the upper revolving superstructure 202, and a hydraulic pipe (not shown) for transmitting hydraulic pressure for driving the opening / closing cylinder mechanism 114.
A hydraulic pipe expansion / contraction mechanism 218 is provided for extending and retracting the hydraulic pipe.

Next, the upper body 202 or the kelly bar 210 of the earth drill working machine 200 is operated to insert the main body 102 into the vertical hole 216.

Next, by operating the second hydraulic unit, the opening and closing cylinder mechanism 114 of the hydraulic excavator 100 is operated.
Is operated to open the excavation part 122 toward the outside of the main body part 102 by an appropriate amount and to rotate the excavation part 122 (the rotation direction is indicated by an arrow in FIGS. 1 and 2). The cutting blade 124 is mounted with the tip of the cutting blade 124 facing in the rotation direction of the hydraulic excavator 100, and excavates a wall surface that abuts.

The excavated earth and sand is guided toward the inside of the main body of the excavator 100 along the blade surface of the cutting blade 124 and the excavation part 122 and is accommodated in the main body 102.
Next, when the soil reaches the storage limit of the main body 102, the opening and closing cylinder mechanism 114 is operated by the second hydraulic unit, and the excavation unit 122 is closed.

When discharging the sediment accumulated in the main body 102, the kelly rope 206 is wound by a winch, the kelly bar 210 is raised, the hydraulic excavator 100 is pulled up to the ground, and the upper rotating body 202 is rotated. Then, the hydraulic excavator 100 is moved to a predetermined discharging position,
28 is opened and the soil is discharged.

When the discharging operation is completed, the opening / closing lid 128 is closed, the upper swing body 202 is rotated to move the hydraulic excavator 100 to just above the vertical hole 216, and the above-described excavation operation is performed again.

By repeating the above operation, the vertical hole 2
The bottom area of 16 can be expanded (bottom expansion). After the outer keriba of the keriba 210 is drooped to the limit, the keriba 210 is extended in the order of the third keriba, the second keriba, and the inner keriba (all not shown).

Since the conventional hydraulic excavator is configured as described above, it is necessary to mount a second hydraulic unit or a hydraulic pipe expansion / contraction mechanism 218 to drive the hydraulic opening / closing cylinder mechanism 114. . Therefore, the probability that the hydraulic device and the hydraulic pipe will fail increases, and it is necessary to always worry about the failure of the hydraulic unit, and it is not possible to mount the hydraulic unit on a relatively small earth drill working machine.

The present invention has been made to solve the above-mentioned disadvantages of the prior art. To restate the purpose of the present invention, first, it is to provide a drilling device for an earth drill that opens and closes a drilling section without using a hydraulic device. Another object of the present invention is to provide a drilling device for an earth drill that can be used in a relatively small earth drill device.

Next, the construction of the earth drilling apparatus 300 according to the present invention will be described. In this apparatus, the hydraulic pressure is not used at the time of opening / closing operation of the excavation part.
It is not necessary to mount the hydraulic device or the hydraulic pipe expansion / contraction mechanism 218, and the excavator 300 is directly attached to the lower end of the kelever.

FIG. 4 is a front view of the drilling device 300 for an earth drill according to one embodiment of the present invention viewed from the horizontal direction. FIG. 5 is a top view showing the drilling device 300 shown in FIG. FIG. 6 shows the excavator 300 shown in FIG.
FIG. 7 is a schematic side cross-sectional view of the excavator 300 shown in FIG. 4 as viewed from the 90 ° lateral direction in FIG.

The excavator 300 has a main body 302 made of a cylindrical steel material as a base. At an appropriate depth from the upper end edge of the main body member 302 on the center vertical axis, a socket 304 into which the tip of an inner kelly bar 410i of the small earth drill working machine 400 described later is inserted is arranged. The socket 304 is provided with a pin insertion hole (not shown) for inserting a pin 305 for locking the lower end of the inner kelly bar 410i.

The socket 304 has an appropriate thickness, and is fixedly welded to the center of a substantially hexagonal slide portion 306 having convex portions 306a formed on two opposing sides.
Below the slide portion 306, a first pipe-shaped member 308 is provided.
Are welded and fixed.

Near the lower end of the first pipe-shaped member 308, a substantially rectangular hole having an appropriate thickness and having a hole formed in the center and having a size through which the first pipe-shaped member 308 penetrates is formed. A link support 310 is fixed around the lower end of the first pipe-shaped member 308.

Further, inside the first pipe-shaped member 308, a second pipe-shaped member 312
02 while being movably inserted in the longitudinal direction of the cylinder.
The bearing part 314 is provided at an appropriate position other than the excavation part of the main body part 302.
Is welded and attached so that the second pipe-shaped member 312 does not move below the bearing portion. Note that the first pipe-shaped member and the second pipe-shaped member have a telescopic structure, and their bottoms are attached to bearings 314 provided at appropriate positions of the main body member 302.

On the side of the slide groove 316 to which the driving force is transmitted, a plurality of notches 318 for controlling the vertical movement of the slide portion 306 and adjusting the opening of the excavation portion as shown in FIG. 8 are provided. .

In the sliding portion 306, two convex portions 306a provided at the opposite electrode are configured to be vertically movable along a slide groove 316 provided at an appropriate position on the inner surface of the main body member 302. As shown in FIG. 8, the shape of the portion that comes into contact with the notch 318 is formed in a substantially wedge-shaped shape so as to easily bite into the notch 318. It should be noted that the shape of the notch 318 has an angle of, for example, about 45 ° up and down from the horizontal direction indicated by the broken line in FIG.

Near the ends on both sides of the link support 310, the upper ends of the links 320 having connection mechanisms at the upper and lower ends having a degree of freedom for rotation about two intersecting axes are attached.

Further, the lower end of the link 320 is attached to an appropriate position on the inner wall surface of the excavated portion 322 which is configured to form a part of the cylindrical shape of the main body member 302. FIG. 9 is a partial cross-sectional view showing the attachment portion of the link 320 to the link support portion 310 in detail, and FIG. 10 is a partial cross-sectional view of FIG.

Here, the structure of the link 320 will be described in detail with reference to FIGS. 9 and 10. The connection mechanism at the upper end of the link 320 includes a first shaft portion 320a, a first locking portion 3
20b, a first bearing 320c, a second shaft 320d,
Columnar projection 320e, holding portion 320f, third shaft 320g, second locking portion 320h, second bearing 320
i and the fourth shaft portion 320j.

As best shown in FIG. 9, the first shaft 3
The first shaft 32a is integrally formed with the second shaft 320d having a diameter larger than that of the first shaft 320a while being locked by the first locking portion 320b at the upper side.
0c, it is rotatably fitted into the link support portion 310. The direction of rotation is the first direction as shown in FIG.
Or around the second shaft portion.

At an appropriate position of the second shaft portion 320d,
A hole (not shown) into which the shaft pin 320e is inserted is formed. The shaft pin 320e is configured to be rotatably held by the holding portion 320f as shown in FIG. The direction of rotation is around the central axis of the cylindrical shape of the shaft pin 320e.

The third shaft portion 320g locked upward by the second locking portion 320h is attached to the holding portion 320f.
Is a fourth shaft portion 32 having a diameter larger than that of the third shaft portion 320g.
0j, and is fitted through the second bearing 320i.

With the connection mechanism configured as described above,
The link 320 is rotatable about two intersecting axes, and does not twist at an intermediate portion of the link 320, and can convert a pushing-down force into a force in the opening direction of the excavation part 322. Note that the connection mechanism at the lower end of the link 320 uses a known connection mechanism that rotates around two axes that are the same as or intersect with the connection mechanism at the upper end, and a description thereof will be omitted.

As shown in FIG. 4, the excavation portion 322 cuts the shortest distance 322a between appropriate positions a and b of the main body member 302, and further cuts straight from point a and b toward the lower end of the main body member 302. A hinge 324 is provided at a straight line portion immediately below the position a, and is a member that can be opened and closed. The cutting portion 322a and the hinge 32
In No. 4, an appropriate alignment was provided between the main member and an opening / closing operation described later and attachment of the cutting blade.

When the excavator 300 is viewed from above,
As shown in FIG. 5, the excavated portion 322 is cut at, for example, 120 °, and the heights a and b when viewed from the front (front direction in FIG. 6 and the like) are, for example, 2.7 m and 0 from the bottom, respectively. It was about 0.5 m.

Cutting blades 326 are suitably attached to the cut portions 322a and 322b of the excavated portion 322 cut from the point b toward the lower end, with the cutting edges directed in the excavation rotation direction. In the drawings after FIG. 4, the illustration of the cutting blade 326 is minimized or omitted.

When the digging portion 322 is viewed from the side, the mounting direction (the direction of the cutting edge) of the cutting blade 326 is the same as the digging direction as shown in FIG. Direction. Further, as shown in FIG. 5 and the like, the cutting blade 326 was attached so as to have an appropriate angle from the tangential direction of the circle toward the outside.

The reason why the cutting blade 326 is attached as described above is as follows.
This is because, when the cutting edge of the cutting blade 326 is attached at a tangential direction or an angle inward from the tangential direction, a resistance force is applied from a wall surface during excavation, and the opening of the excavated portion 322 is suppressed.

At the lower end of the excavated portion 322, a skirt engaging portion 330 as shown in FIGS. 12 and 13 is provided. A skirt portion 334 is fixed to the skirt engagement portion 330 by a bolt 332 or the like, so that the lower end of the excavated portion 322 is prevented from being damaged, and the excavating ability of the lower end portion is enhanced.

The cutting blade 326 includes the parent nail 326a and the child nail 32.
6b. The attachment position of the parent nail 326a is alternately offset for each of the facing excavation parts 322, and the child nail 3
26b is arbitrarily replaceable.

This is because of the two opposing excavations,
This is because the wall of the vertical hole is excavated evenly.
In addition, since the cutting blade 326 uses what is generally used, the detail is abbreviate | omitted.

At the lower end of the main body member 302, a bottom cover 336 is provided.
Are provided so as to be openable and closable around a hinge (not shown) as a central axis, and are provided with fasteners (not shown) so as to be able to hold a closed state during excavation. As shown in FIG. 4, eight stabilizer mounting holes 338 for mounting a stabilizer (described later) are provided near the upper end of the main body member 302 at equal intervals.

In the above-described configuration, the above-described cutting edge 32
Except for the mounting position 6, the excavator 300 of the present application is symmetric with respect to the extension axis of the rotation axis of the inner kelly bar 410i. That is, the excavator 300 has a point symmetry about the central axis 328 when viewed from above, as best shown in FIG.
Thus, while the above configuration is described on one side, a similar configuration is symmetric about a central axis, except for the cutting edge 326 offset as described above.

The dimensions of each part of the earth drilling rig 300 according to this embodiment are approximately 3.5 m in height in the vertical direction and 1.1 m in diameter, for example.
The main body member 302 including the excavation part 322 is formed of a steel plate having a thickness of, for example, about 10 mm. In addition, cutting blade 3
26 is made of hardened steel of high hardness.

FIG. 15 is an explanatory top view showing the structure of a stabilizer mounted near the upper end of the main body member 302. The drilling device 3 for an earth drill according to this embodiment is shown in FIG.
00 is a sectional view taken along line XVI-XVI in FIG.
Stabilizer 3 having a substantially C-shaped cross section as shown in FIG.
50 is provided. The stabilizer 350 is attached to the stabilizer mounting hole 338 provided near the upper end of the main body member 302 by a bolt 354 and a nut 356 via a stay 352. The stabilizer 35
0 is divided into four parts as shown in the figure to facilitate attachment and detachment.

In this embodiment, the outer diameter of the stabilizer 350 is, for example, 1.5 m. However, the diameter of the stabilizer 350 is, for example, 0 mm so as to match the diameter of the vertical hole into which the earth drilling device 300 is inserted. A plurality of types were prepared every 1 m. 15 and 16, illustration of the excavation part 322 and the like is omitted.

FIG. 17 is an explanatory top view of a slide stabilizer 360 used for the same application as in FIG.
FIG. 18 is a sectional view taken along line XVIII-XVIII in FIG. 17.
As is best shown in FIG.
The diameter near the upper end of the main body member 302 is reduced by the thickness of the main body member 302. 2 for each slide stabilizer 360
The slide shaft 362 is attached, and the slide shaft 362 is slidably accommodated in the slide shaft holder 364 provided in the small diameter portion described above. Further, a hole (not shown) into which the pin 366 can be inserted is formed at an appropriate position of the slide shaft holder 364 at the slide shaft sliding position.

The slide-type stabilizer is slid manually or by using an appropriate hydraulic mechanism (not shown), and the slide shaft 362 is provided with holes for inserting pins 366 every 5 cm, for example. After moving 360 to a position corresponding to the diameter of the vertical hole into which the drilling device 300 for earth drill is inserted, the pin 3
Fix by 66. Note that the stabilizers shown in FIGS. 15 to 17 are provided to cope with fluctuations in the diameter of the vertical hole and are publicly known, and therefore detailed description thereof will be omitted.

Next, the operation of expanding the bottom of the excavator 300 will be described.

An earth drill drilling apparatus 300 according to this embodiment is different from an earth drill working machine 200 equipped with a conventional earth drill drilling apparatus 100 as shown in FIG. Work machine 40
0.

FIG. 12 is a front view when the excavating section 322 is operated (when fully opened) and viewed from the same direction as FIG. 4, and FIG.
14 is a side view of the excavator shown in FIG.
FIG. 6 is a top view seen from the same direction as FIG. 5. 12 and 14, in order to clearly explain the internal structure, the digging portion 322 existing on the front surface is shown by a broken line so as to be seen through.

In the earth drill working machine 400, the operator who gets on the vehicle is
By manipulating the undulation angle of the excavator 300 and the like, the excavator 300 is moved above the excavation position.
Is inserted into the excavated vertical hole by a known drilling bucket or the like.

After the insertion, the excavator 300 descends inside the vertical hole 216 by the feeding operation of the kelly rope 406 until it reaches the bottom of the hole. Next, as shown in FIG. 19, when the excavator arrives at the bottom of the hole, the kelly rope 406 is used.
Is completed, and the Kelly drive 410 is driven to rotate the Kelly bar 410.

The rotational driving force of the kelly drive 414 is determined by the third kelly bar, the second kelly bar, and the inner kelly bar 4.
The drilling rig 300 transmitted in the order of 10i and connected to the lower end of the inner kelly bar 410i via the socket 304 or the link 320 is rotationally driven.

The excavator 300 has a front frame 41
2, a downward force is exerted from the bottom of the excavator 3 when a downward pushing force is applied to the kelly bar after the arrival at the bottom of the hole.
00 is restrained from falling below the hole bottom position. Accordingly, as described above, the Keliva pressing force is converted into a force in the opening direction of the excavated portion 322 via the link 320, and the excavated portion 322 is opened.

Next, the operation of suppressing the vertical movement of the slide portion 306 will be described.

Here, when the rotation is applied in the excavation direction while applying the pushing-down force, the slide portion 306 becomes the slide groove 316.
(In FIG. 8, the position of the slide portion 306 cut into the notch of the third step is shown by a broken line in FIG. 8), and the descent below the notch is suppressed. Note that the slide unit 306 is not limited to descending one step at a time, and may descend a plurality of steps at a time as needed.

When the socket 304 or the link support portion 310 is pushed down, the upper end of the link 320 is pushed down by one notch length (or an appropriate number of notch lengths), and the excavated portion 322 is moved by an appropriate amount according to this notch length. open.

In this embodiment, the excavation radius is designed to be changed, for example, by 5 cm each time one step is changed. Also, the oblique angle θo when the excavation part 322 is opened.
The pn (shown in FIG. 13) was designed to be less than 12 ° at the maximum.

Since the excavator 300 is also applied with a rotational force in the excavation direction by the Kelly drive 414, the excavator 300 excavates the wall surface against which the cutting blade 322 attached to the excavator 322 contacts while rotating. Then, excavation operation of the vertical hole wall surface around the hole bottom of the cutting hole is performed. The excavated earth and sand is stored inside the main body member 302 along the blade surface of the cutting blade 326 and the excavated portion 322.

Next, when the earth and sand reach the accommodation limit of the main body member 302, the kelly rope 406 is wound up to start pulling up the excavator. As described above, the main body member 302
Receiving the gravity downward due to its own weight, the integrated socket 304, slide portion 306, first pipe-shaped member 308 and link support portion 310 move upward along the slide groove 316 and the upper end of the link 320. When a pulling force is applied to the lower end of the link 320, the hinge 324
The force in the closing direction of the excavation part 322 centering on
The excavation part 322 is closed.

Since the notch 318 has a shape that suppresses vertical movement only when a rotational force is applied in the excavation direction, the rotational force is applied regardless of the position of the slide portion 316. If the kelly rope 406 is wound up in a state where there is no excavation, the excavation part 322 can be closed to a fully closed state.

Next, the kelly rope 410 is wound up by the winch and the kelly bar 410 is lifted up.
To the ground. Next, the excavator 300 is moved above a predetermined discharging position by turning the upper turning body 002, and the bottom cover 336 is opened and closed to discharge the stored earth and sand.

By repeating the above operations, the wall surface can be excavated so as to enlarge the bottom area of the vertical hole as shown in FIG. 19 and 20, only the main parts (the main body member, the excavation part, etc.) of the excavator 300 are shown, and the illustration of each part is simplified. After the outer keriba is suspended to the limit, each keriba extends in the order of the third keriba, the second keriba, and the inner keriba 410i, and the excavator 300 reaches the bottom of the vertical hole.

[0086] In the first embodiment, as described above, the excavating section 300 is connected to the earth drill working machine 400.
The present invention provides an excavating device that opens and closes an excavating unit without using a hydraulic device for opening and closing the excavating unit because the opening and closing operation is performed in response to the pressing force transmitted from the Keriba and the reaction force of the pressing force. And can be mounted on a relatively small earth drill working machine 400.

Next, a drilling device for an earth drill according to a second embodiment of the present invention will be described.

In the drilling apparatus for an earth drill according to the second embodiment, as shown by a broken line in FIG. 6, a slide type sensor 500 is provided to detect the presence of the slide portion 306, for example. , Earth drill working machine 40
The ECU 502 is provided at 0 or at an appropriate position of the excavator 300. The output of the sensor 500 is sent to the ECU 502,
A monitor 504 provided at an appropriate position in a driver seat (not shown)
Is configured to display the current opening and the excavation radius. The remaining configuration is not different from the drilling device for an earth drill according to the first embodiment.

According to the second embodiment of the present invention, with such a configuration, an operator who excavates at the driver's seat (not shown) can check the current opening degree and excavation radius. As described above, in the earth drilling digging device according to the first and second embodiments, the digging radius of the digging portion 322 is determined by the sliding groove 316.
Is designed to be changed by, for example, 5 cm each time the notch provided in the table is moved.

Therefore, by providing the above configuration,
In addition to the effects achieved by the first embodiment, the excavation accuracy can be increased.

As described above, the drilling apparatus 300 for an earth drill according to the present invention is attached to the lower end of the kelly bar 410i of an earth drill (earth drill working machine 400), and can be opened and closed with the main body member 302.
In the drilling device for an earth drill having the bottom area of the vertical hole 216 provided with the hole 22, the digging portion operates according to the pushing force transmitted from the earth drill and the reaction force of the pushing force (FIG. 12). 13).

Further, the main body member 302 has a cylindrical shape, and the excavation part is configured to be a part of the cylindrical shape.

The pushing force is transmitted through a pushing force transmitting means (link 320) movable in the longitudinal direction of the cylinder inside the main body member, and the pushing force opens the excavation portion. It was configured to be converted to directional force.

Further, the excavating portion can be opened and closed with an axis (rotation center axis of the hinge 320) in the main body member parallel to the central axis in the longitudinal direction of the cylindrical body of the main body member as a center line.

[0095] The excavation section is provided with a plurality of cutting members (cutting blades 326) so that the tips protrude in the excavation rotation direction of the main body member.

The pressing force transmitting means includes a groove (slide groove 316) provided in the cylindrical longitudinal direction in a portion other than the excavated portion of the main body member, and a cylindrical upper portion of the main body member in the cylindrical longitudinal direction. A socket 304 connected to the lower end of the kelly bar on the longitudinal center axis in the vicinity
And a connecting member (slide portion 306) movable in the longitudinal direction along the groove portion, and a hollow portion integrally formed with the connecting member downward of the connecting member. Shaft (first pipe-shaped member 308)
And a push-down force transmitting member (link support portion 310) integrally provided around the first shaft portion, and one end inserted into the first shaft portion to a position near the lower end of the main body member. A second shaft 312 configured to be movable in the longitudinal direction, and a bearing 314 provided at an appropriate position of the cylindrical shape and locking a lower end of the second shaft.
And, it consisted of.

The pushing force transmitting means and the excavating portion have movable ends at both ends about two intersecting axes, and are rotatable in a twisting direction between the ends. Push-down force converter (link 32
0) to be connected to the pressing force transmitting member.

Further, the main body member has a lid (bottom lid 336) attached to the bottom of the main body so as to be openable and closable.

Further, the excavation part is provided with an excavation assisting member (skirt part 334) at the lower end.

The groove is provided with a notch 318 for suppressing the lowering of the connecting member.

Further, a detecting means (sensor 500) for detecting the position of the pressing force transmitting member is provided inside the cylindrical shape of the main body member.

Although the cutting edge 326 is attached to the excavating part 322, a cutting member such as a scraper (not shown) is attached in place of the cutting edge according to the excavation condition. Is also good.

Although the notch 318 has a shape that suppresses vertical movement, it may have a shape that suppresses only downward movement.

[0104]

According to the first aspect of the present invention, it is possible to provide a drilling device for opening and closing a digging portion without using a hydraulic device for opening and closing the digging portion, and to provide a relatively small earth drill working machine. It is possible to provide a drilling device that can also be mounted.

According to the second aspect, in addition to the above-described effects, the excavator can quickly reach the bottom of the hole.

According to the third aspect of the present invention, it is possible to provide a drilling device for opening and closing a drilling portion without using an oil device for opening and closing the drilling portion, and to efficiently reduce the pushing force of an earth drill. Can be converted to the force required for the operation of

According to the fourth aspect of the present invention, it is possible to provide a drilling apparatus for opening and closing a drilling part without using a hydraulic device for opening and closing the drilling part, and to further efficiently reduce the pressing force of an earth drill. The force can be converted into the force required for the operation of the excavation unit, and the excavator can quickly reach the bottom of the hole.

According to the fifth aspect, it is possible to provide a digging device for opening and closing a digging portion without using a hydraulic device for opening and closing the digging portion, and it is possible to efficiently perform a digging operation.

According to the sixth aspect of the present invention, it is possible to provide a drilling apparatus for opening and closing a digging portion without using a hydraulic device for opening and closing the digging portion, and to more efficiently reduce a pressing force of an earth drill. It can be converted into the force required for the operation of the excavation unit.

According to the present invention, it is possible to provide a drilling device for opening and closing the excavation portion without using a hydraulic device for opening and closing the excavation portion, and to more efficiently reduce the pushing force of the earth drill. It can be converted into the force required for the operation of the excavation unit.

According to the eighth aspect, it is possible to provide a digging device for opening and closing a digging portion without using a hydraulic device for opening and closing the digging portion, and it is possible to more efficiently perform a digging operation. .

According to the ninth aspect, it is possible to prevent the excavated portion from being damaged and to enhance the excavating ability.

According to the tenth aspect, the excavation amount can be accurately controlled.

According to the eleventh aspect, the person performing the work can detect the current opening degree of the excavation part.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing a configuration of a conventional hydraulic drilling apparatus for an earth drill.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an explanatory view in which the hydraulic drilling device for an earth drill shown in FIG. 1 is mounted on an earth drill working machine.

FIG. 4 is a front view of the drilling device for an earth drill according to the present invention as viewed from a horizontal direction.

FIG. 5 is a top view showing a state where the drilling device for an earth drill shown in FIG. 4 is viewed from above.

FIG. 6 is a front partial sectional view showing the internal structure of the drilling device for an earth drill shown in FIG. 4;

FIG. 7 shows the drilling device for an earth drill shown in FIG.
It is the side surface partial sectional view seen from the side.

FIG. 8 is a partial explanatory view illustrating a groove structure of the earth drilling rig shown in FIG. 4;

9 is a partial cross-sectional view illustrating a connection structure of a press-down force converter (link) of the drilling device for an earth drill shown in FIG.

FIG. 10 is a partial cross-sectional view of FIG. 9 as viewed from the side at 90 °.

11 is an explanatory view showing a state in which the drilling device for an earth drill shown in FIG. 4 is mounted on a small-sized earth drill.

FIG. 12 is a front view of the earth drilling digging device according to the present invention when the digging portion is opened, as viewed from the front in the horizontal direction.

FIG. 13 is a side view of the excavator shown in FIG. 12 as viewed from the side at 90 °.

FIG. 14 is a top view of the earth drilling rig shown in FIG. 12 when the digging unit is opened, as viewed from the vertical direction.

FIG. 15 is an explanatory top view showing the configuration of a stabilizer mounted near the upper end of the main body member 302.

FIG. 16 is a sectional view taken along line XVI-XVI in FIG. 15;

FIG. 17 is an explanatory top view showing the configuration of a slide stabilizer mechanism provided near the upper end of the main body member 302.

18 is a sectional view taken along line XVIII-XVIII in FIG.

FIG. 19 is an explanatory diagram illustrating a digging operation of the digging device for an earth drill shown in FIG.

20 is an explanatory diagram illustrating a digging operation of the earth drill digging device shown in FIG. 12 in a state where the digging unit is opened.

[Explanation of symbols]

 Reference Signs List 300 excavator 302 main body member 304 socket 306 slide part (connection member) 308 first pipe-shaped member 310 link support part (push-down force transmission member) 312 second pipe-shaped member 314 bearing part 316 slide groove 318 cut 320 link ( Push-down force conversion unit) 322 Drilling unit 324 Hinge 326 Cutting blade 336 Bottom lid 400 Earth drill working machine 410 Keriba

Claims (11)

[Claims] 1. An earth drilling digging device which is attached to a lower end of a kelly bar of an earth drill and has a main body member and an openable and closable digging portion to enlarge a bottom area of a vertical hole, wherein the digging portion comprises: An excavator for an earth drill, wherein the excavator is configured to operate in response to a pushing force transmitted from the earth drill and a reaction force of the pushing force. 2. The body member has a cylindrical shape,
The drilling device for an earth drill according to claim 1, wherein the drilling portion forms a part of the cylindrical shape. 3. The push-down force is transmitted through push-down force transmission means movable in a longitudinal direction of the cylindrical shape inside the main body member, and the push-down force is reduced to a force in a direction to open the excavation portion. The drilling device for an earth drill according to claim 1 or 2, which is converted. 4. The digging portion is configured to be openable and closable about an axis in a main body member parallel to the central axis of the main body member in a longitudinal direction of the cylinder.
Item 4. The drilling device for an earth drill according to any one of Items 3 to 3. 5. The ground according to claim 1, wherein the excavation part includes a plurality of cutting members such that tips thereof protrude in a direction of excavation rotation of the main body member. Drilling rig for drills. 6. The depressing force transmitting means includes: a. A groove portion provided in a longitudinal direction of the cylindrical shape in a portion other than the excavated portion of the main body member; b. A connection member near the cylindrical longitudinal upper portion of the main body member, the socket being connected to the lower end of the kerry bar on a longitudinal central axis, and being movable in the longitudinal direction along the groove; c. A first shaft portion having a hollow portion integrally formed with the connection member downwardly of the connection member; d. A pressing force transmitting member integrally provided around the first shaft portion; e. A second shaft portion having one end inserted into the inside of the first shaft portion and configured to be movable in the longitudinal direction in a range up to near the lower end of the main body member; and f. The drilling device for an earth drill according to claim 3, further comprising: a bearing portion provided at an appropriate position of the cylindrical shape and locking a lower end of the second shaft portion. 7. The push-down force transmitting means and the excavating portion have movable ends at both ends about two axes intersecting each other, and between the ends, are rotatable in a twisting direction. The drilling device for an earth drill according to any one of claims 3 to 6, wherein the drilling device is configured to be connected to the pushing force transmitting member by a pushing force conversion unit. 8. The apparatus according to claim 1, wherein the main body member includes a lid portion that is openably and closably attached to the bottom of the main body.
Item 8. The drilling device for an earth drill according to any one of items 7 to 7. 9. The drilling device for an earth drill according to claim 1, further comprising a drilling assisting member provided at a lower end of the drilling portion. 10. The device according to claim 6, wherein the groove has a notch for suppressing the vertical movement of the connection member.
Item 10. A drilling device for an earth drill according to any one of Items 9 to 9. 11. The device according to claim 3, wherein a detecting means for detecting a position of the pressing force transmitting member is provided inside the cylindrical shape of the main body member. Drilling rig for earth drill.