JP3607845B2 - Drilling device for earth drill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a drilling device for an earth drill, and more specifically, around a hole bottom of a vertical hole drilled in the ground, which is attached to the tip of a ground drill used in an earth drill method that is a type of cast-in-place pile method. The present invention relates to an excavation apparatus that expands (or expands) the bottom area of a hole by excavating the wall surface.
[0002]
[Prior art]
In the earth drill method, conventionally, as a drilling device for drilling a vertical hole, an earth drill work machine equipped with a drilling bucket is used, and after drilling the vertical hole, concrete is filled into the vertical hole. To complete the cast-in-place pile.
[0003]
In order to increase the durable load of cast-in-place piles, it is preferable to expand the bottom area of the vertical hole. When expanding the bottom area, the bottom of the hole is used to reduce the amount of concrete and excavated soil used. Since it is preferable to excavate the peripheral wall surface, recently, an excavator that expands the bottom area by opening and closing a portion where the wall surface is excavated by a hydraulic cylinder after arrival at the bottom of the vertical hole is used.
[0004]
[Problems to be solved by the invention]
In the conventional hydraulic excavator, if the hydraulic cable breaks during the expansion work of the hole bottom area, in the worst case, it becomes difficult to pull up the device itself from the hole bottom, and the foundation pile driving process becomes large. There was an inconvenience of delay.
[0005]
In general, there are various types of earth drill working machines having different sizes and outputs depending on the usage environment and purpose. Since the conventional excavator described above uses a hydraulic mechanism for opening and closing the excavation part, it can be used only in an earth drill capable of mounting a plurality of hydraulic units. That is, generally, an earth drill is equipped with a hydraulic unit for driving a kelly drive, but since an excavating device for an earth drill according to the prior art is hydraulically operated, it is necessary to install an additional hydraulic unit. Also, it could only be used with relatively large earth drills.
[0006]
Accordingly, a first object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide an excavation device for an earth drill that opens and closes an excavation part without using a further hydraulic device.
[0007]
Furthermore, 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 device.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an excavation device for an earth drill according to the present invention is attached to the lower end of a kelly bar of an earth drill in claim 1,CylindricalIn an earth drill excavator that includes a main body member and an excavating part configured to be openable and closable to expand the bottom area of the vertical hole, the excavating part includes:Via the force transmission meansFrom the earth drillofPushing force and reaction force of said pushing forceCommunicatedOperateThe push-down force transmitting means includes a groove provided in the longitudinal direction of the cylindrical shape of the main body member, a connection member connected to the lower end of the kelly bar and movable in the longitudinal direction along the groove, and A first shaft portion integrally formed with the connection member toward a lower side of the connection member; a push-down force transmission member integrally provided around the first shaft portion; and the first shaft And a second shaft portion configured to be movable in the longitudinal direction in a range up to the vicinity of the lower end of the main body member, and provided at an appropriate position of the cylindrical shape, the second shaft From the bearing part that locks the lower end of the partConfigured. Accordingly, it is possible to provide a drilling device that can open and close 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.Furthermore, the pressing force of the earth drill can be transmitted to the excavation part more efficiently. The ground drill excavating device according to claim 2, wherein the drilling device is attached to a lower end of the kelly bar of the earth drill and includes a cylindrical main body member and an excavating portion configured to be openable and closable to enlarge the bottom area of the vertical hole. A groove provided in the cylindrical longitudinal direction of the main body member, a connecting member connected to the lower end of the kelly bar and movable in the longitudinal direction along the groove, and the connecting member provided in the groove And a step for suppressing the vertical movement in the longitudinal direction, and the excavation part is operated by receiving a pressing force from the earth drill and a reaction force of the pressing force through the connecting member. Configured. Accordingly, it is possible to provide a drilling device that can open and close 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. Furthermore, the amount of excavation can be controlled with high accuracy.
[0009]
Claims3In terms,PreviousThe excavation part was configured to be a part of the cylindrical shape. Thereby, in addition to the above-described effects, the excavator can quickly reach the hole bottom.
[0010]
Claims4In the section, the pressing forceThe transmission means is movable in the longitudinal directionAnd the pressing force isVia the push-down force transmission meansConverted into force in the direction of opening the excavation partTransmitted to the excavation partIt was configured as follows. As a result, 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 the pressing force of the earth drill into a force necessary for the operation of the drilling unit. Can do.
[0011]
Claims5The excavation part is configured to be openable and closable with an axis in the main body member parallel to the cylindrical longitudinal central axis of the main body member as a center line. As a result, it is possible to provide a drilling device that opens and closes the drilling unit without using a hydraulic device for opening and closing the drilling unit, and to further reduce the force required for the operation of the drilling unit to reduce the force of pushing down the earth drill. As well as being able to convert, the drilling rig can quickly reach the bottom of the hole.
[0012]
Claims6In the item, the excavation part is configured to include a plurality of cutting members so as to protrude the tip in the excavation rotation direction of the main body member. 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 it is possible to efficiently perform a drilling operation.
[0014]
Further, in claim 7,further,A connecting mechanism movable around the longitudinal axis and an axis perpendicular theretoAnd the connection mechanismBetween the connection mechanismsLeavePush-down force converter that can rotate in the torsional directionAnd the push-down force transmitting means and the excavation part include the push-down force converting part.It was comprised so that it might be connected via. As a result, it is possible to provide a drilling device that opens and closes the drilling unit without using a hydraulic device for opening and closing the drilling unit, and to further reduce the force required for the operation of the drilling unit to reduce the force of pushing down the earth drill. Can be converted.
[0015]
The main body member according to claim 8, wherein the main body member is the main body.PartIt was comprised so that the cover part attached so that opening and closing was possible was provided in the bottom 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 it is possible to perform a drilling operation more efficiently.
[0018]
Claims9In the above configuration, the cylindrical member of the main body member is provided with a detecting means for detecting the position of the push-down force transmitting member. Thereby, the person who performs work can detect the opening degree of the present excavation part.The excavator for an earth drill according to claim 10, wherein the excavator is attached to a lower end of a kelly bar of an earth drill and includes a main body member and an excavating portion configured to be openable and closable to enlarge a bottom area of a vertical hole. An excavation assisting member is provided at the lower end of the part, and the excavation part is configured to operate in accordance with a pressing force transmitted from the earth drill and a reaction force of the pressing force. Accordingly, it is possible to provide a drilling device that can open and close 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. Furthermore, the excavation part can be prevented from being damaged and the excavation ability can be enhanced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an earth drilling excavator according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0020]
First, for the convenience of understanding an excavator for an earth drill according to one embodiment of the present invention, first, a hydraulic earth drill excavator according to the prior art, more specifically, an earth drill working machine. The overall configuration and operation of a hydraulic earth drill excavator used for expanding the conventional hole bottom area according to the above will be described.
[0021]
FIG. 1 is a side sectional view of a conventional hydraulic excavator 100, FIG. 2 is a partial top perspective view of FIG. 1, and FIG. 3 is a relatively large earth drill including a plurality of hydraulic units of the conventional excavator. It is explanatory drawing with which the working machine was mounted | worn.
[0022]
A conventional hydraulic excavator 100 is configured around a substantially cylindrical main body 102 as schematically shown in FIG. 2, which is a sectional view taken along line II-II in FIG. 1 and FIG. 1. A socket mounting base 104 that is closed like a lid in the diameter direction of the main body 102 is installed on the upper portion of the main body 102. A socket 106 is provided at the center position of the socket mounting base 104, that is, the upper surface of the rotational center position of the hydraulic excavator 100, and is attached to the lower end of the kelly bar (shown in FIG. 3) of the earth drill working machine as described later. The Both are provided with a pin hole 107 that coincides when inserted, and are fixed by a pin (not shown).
[0023]
A shaft portion 110 is formed immediately below the rotation center of the socket mounting base 104, and an opening / closing operation is performed near the socket mounting base of the shaft portion 110 by a hydraulic pressure via a cylinder mounting base 112. The cylinder mechanism 114 is attached so as to face the central axis of the shaft portion 110 by 180 °.
[0024]
A thruster 118 that is movable up and down along the slide guide 116 is provided below the opening / closing cylinder mechanism 114 of the shaft 110.
[0025]
Below the thruster 118, a link 120 is attached at a position facing the central axis in the longitudinal direction of the main body (vertical direction in FIG. 1) by 180 °. The link 120 has a connection mechanism that can rotate around two orthogonal axes at the upper and lower ends, and a connection mechanism that can rotate around a link axis (not shown) at an appropriate position in the middle of the link. At the same time, the upper end (connection mechanism) of the link 120 is attached below the thruster 118.
[0026]
Further, the lower end of the link 120 is attached to an appropriate position of the excavation part 122 forming a part of the cylindrical shape.
[0027]
The excavation part 122 includes a suitable number of cutting blades 124 as shown in the drawing with respect to the excavation rotation direction, and is configured to be opened and closed around the hinge by a hinge 126. An opening / closing lid 128 that can be opened and closed by an appropriate opening / closing mechanism is provided on the bottom surface of the main body 102.
[0028]
Next, the bottom expanding operation of the conventional hydraulic excavator 100 will be described with reference to FIG.
[0029]
The hydraulic excavator 100 having the above-described configuration replaces a drilling bucket with a vertical hole drilled to a predetermined position of a support layer by an earth drill working machine 200 equipped with a known drilling bucket (not shown). These are mounted and inserted into an earth drill working machine 200 equipped with a second hydraulic unit (not shown).
[0030]
The earth drill working machine 200 used here includes an upper turning body 202, a boom 204, a kelly rope 206, and a kelly bar 210, and a kelly drive 214 that applies a rotational force to the kelly bar 210. The hydraulic excavator 100 is attached to the tip of the kelly bar of the earth drill work machine 200 and descends inside the vertical hole until it reaches the bottom (not shown) of the vertical hole 216.
[0031]
In order to use the hydraulic earth drill excavator 100 according to the prior art, a second hydraulic unit (not shown) is mounted at an appropriate position of the upper swing body 202 of the earth drill 200, and A hydraulic pipe expansion / contraction mechanism 218 for extending / contracting a hydraulic pipe (not shown) for transmitting hydraulic pressure for driving the opening / closing cylinder mechanism 114 is provided, and the hydraulic pipe is extended and wound up with respect to the hydraulic excavator.
[0032]
Next, the upper swing 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.
[0033]
Next, the second hydraulic unit is operated, the opening / closing cylinder mechanism 114 of the hydraulic excavator 100 is operated, and the excavation part 122 is opened by an appropriate amount toward the outside of the main body part 102 and is driven to rotate (see FIG. 1 and 2 indicate the direction of rotation with arrows). The cutting blade 124 is mounted with the tip of the cutting blade 124 facing the rotation direction of the hydraulic excavator 100 and excavates the abutting wall surface.
[0034]
The excavated earth and sand are guided toward the inside of the main body of the excavating device 100 along the blade surface of the cutting blade 124 and the excavating part 122 and are accommodated in the main body 102. Next, when the earth and sand reach the accommodation limit of the main body 102, the second hydraulic unit operates the opening / closing cylinder mechanism 114 to close the excavation part 122.
[0035]
When discharging the sediment accumulated in the main body 102, the kelly rope 206 is rolled up by a winch to raise the kelly bar 210, the hydraulic excavator 100 is pulled up to the ground, and then the upper swing body 202 is rotated to make hydraulic pressure. The excavator 100 is moved to a predetermined soil removal position, and the open / close lid 128 is opened to perform soil removal.
[0036]
When the earth removal is completed, the open / close lid 128 is closed, the upper swing body 202 is rotated, the hydraulic excavator 100 is moved to a position directly above the vertical hole 216, and the excavation operation described above is performed again.
[0037]
By repeating the above operation, the bottom area of the vertical hole 216 can be expanded (bottom expansion). In addition, after the outer keriva of the Keriba 210 is drooped to the limit, the Keriva 210 is extended in the order of the third Keriva, the second Keriba, and the inner Keriva (all not shown).
[0038]
Since the conventional hydraulic excavator is configured as described above, a second hydraulic unit or hydraulic pipe expansion / contraction mechanism 218 needs to be mounted in order to drive the hydraulic opening / closing cylinder mechanism 114. Therefore, the probability of failure of the hydraulic device and the hydraulic pipe is increased, it is necessary to always be concerned about the failure of the hydraulic unit, and it cannot be mounted on a relatively small earth drill working machine.
[0039]
The present invention has been made to overcome the above-mentioned drawbacks of the prior art. The object of the present invention will be reexplained here. First, it is an object to provide a drilling device for an earth drill that opens and closes a drilling unit without using a hydraulic device. It is another object of the present invention to provide a drilling device for an earth drill that can be used even in a relatively small earth drill device.
[0040]
Next, the configuration of the ground drilling excavator 300 according to the present invention will be described. In this apparatus, since the hydraulic pressure is not used during the opening / closing operation of the excavation section, it is not necessary to mount the second hydraulic apparatus or the hydraulic pipe expansion / contraction mechanism 218, and the excavation apparatus 300 is directly attached to the lower end of the kelly bar. .
[0041]
4 is a front view of the ground drilling excavator 300 according to one embodiment of the present invention as seen from the horizontal direction, and FIG. 5 is a top view showing the excavator 300 shown in FIG. 4 as seen from above. 6 is a schematic front sectional view of the excavator 300 shown in FIG. 4 as viewed from the same direction as FIG. 4, and FIG. 7 is a schematic side sectional view of the excavator 300 shown in FIG. .
[0042]
The excavator 300 is configured with a main body member 302 made of a steel material formed in a cylindrical shape as a base. At an appropriate depth on the central vertical axis from the upper end edge of the main body member 302, a socket 304 into which a tip of an inner kelly bar 410i of a small earth drill working machine 400 described later is inserted is disposed. The socket 304 is provided with a pin insertion hole (not shown) for inserting a pin 305 that locks the lower end of the inner kelly bar 410i.
[0043]
The socket 304 has an appropriate thickness and is welded and fixed to the center of a substantially hexagonal slide portion 306 in which convex portions 306a are formed on two opposing sides. A first pipe member 308 is welded and fixed below the slide portion 306.
[0044]
In the vicinity of the lower end of the first pipe-shaped member 308, a substantially rectangular link support portion having an appropriate thickness and having a hole having a size through which the first pipe-shaped member 308 passes is formed in the center. 310 is fixed around the lower end of the first pipe-shaped member 308.
[0045]
Further, the second pipe-shaped member 312 is inserted into the first pipe-shaped member 308 so as to be movable in the cylindrical longitudinal direction of the main body member 302 from below, and other than the excavation portion of the main body section 302. The bearing portion 314 is welded and attached at an appropriate position, and the second pipe-shaped member 312 is welded so as not to move below the bearing portion. The first pipe-like member and the second pipe-like member have a telescopic structure, and the bottoms thereof are attached to the bearing portions 314 provided at appropriate positions of the main body member 302.
[0046]
On the side to which the driving force of the slide groove 316 is transmitted, a plurality of notches 318 for adjusting the opening degree of the excavation part by suppressing the vertical movement of the slide part 306 as shown in FIG.
[0047]
In the slide portion 306, the two convex portions 306 a provided on the counter electrode are configured to be movable up and down along the slide groove 316 provided at an appropriate position on the inner surface of the main body member 302, as shown in FIG. As shown, the shape of the portion that contacts the notch 318 is generally wedge-shaped so that the notch 318 can easily bite. The shape of the step 318 is set to have an angle of, for example, about 45 ° up and down from the horizontal direction indicated by the broken line in FIG.
[0048]
Near the ends on both sides of the link support portion 310, the upper ends of links 320 having connection mechanisms having degrees of freedom to rotate around two intersecting axes are attached.
[0049]
Further, the lower end of the link 320 is attached to an appropriate position on the inner wall surface of the excavation part 322 configured to form a part of the cylindrical shape of the main body member 302. FIG. 9 is a partial cross-sectional view showing in detail a portion where the link 320 is attached to the link support portion 310, and FIG. 10 is a partial cross-sectional view of FIG.
[0050]
Here, the configuration 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 320b, and a first bearing. 320c, a second shaft portion 320d, a cylindrical protrusion 320e, a sandwiching portion 320f, a third shaft portion 320g, a second locking portion 320h, a second bearing 320i, and a fourth shaft portion 320j. The
[0051]
As well shown in FIG. 9, the first shaft portion 320a is locked by the first locking portion 320b at the upper side, and the second shaft portion is larger in diameter than the first shaft portion 320a. It is integrally formed with 320d and is fitted to the link support portion 310 via the first bearing 320c so as to be rotatable. The direction of rotation is around the first or second shaft as shown in the figure.
[0052]
A hole (not shown) into which the shaft pin 320e is inserted is formed at an appropriate position of the second shaft portion 320d. In the manufacturing process of the link 320, the shaft pin 320e is configured to be rotatably held by a holding portion 320f as shown in FIG. The rotating direction is around the center axis of the cylindrical shape of the shaft pin 320e.
[0053]
The third shaft portion 320g, which is locked upward by the second locking portion 320h, is integrated with the fourth shaft portion 320j having a diameter larger than that of the third shaft portion 320g. Formed and fitted through the second bearing 320i.
[0054]
With the connection mechanism configured as described above, the link 320 can be rotated around two intersecting axes, and the link 320 does not twist in the middle portion of the link 320. It can be converted to force in the opening direction. The connection mechanism at the lower end of the link 320 uses a known connection mechanism that rotates about two intersecting axes in the same manner as the connection mechanism at the upper end or the description thereof is omitted.
[0055]
As shown in FIG. 4, the excavation part 322 is formed by cutting the shortest distance 322a between appropriate positions a and b of the main body member 302 and further cutting linearly from the points a and b toward the lower end of the main body member 302. At the same time, a hinge 324 is provided in a straight portion directly below the position a, and the member is configured to be openable and closable. The cutting portion 322a and the hinge 324 are provided with an appropriate alignment with the main body member in consideration of the opening / closing operation described later and attachment of the cutting blade.
[0056]
When the excavator 300 is viewed from above, the excavation part 322 is cut at, for example, 120 ° as shown in FIG. 5, and heights a and b when viewed from the front (front direction in FIG. 6 and the like). For example, the length was set to about 2.7 m and 0.5 m from the bottom.
[0057]
An appropriate number of cutting blades 326 are attached to the cut portion 322a and the portion 322b cut from the point b toward the lower end direction of the excavation part 322 with the cutting edge directed in the excavation rotation direction. In FIG. 4 and subsequent figures, the illustration of the cutting blade 326 is minimized or omitted.
[0058]
When the excavation part 322 is viewed from the side, the attachment direction of the cutting blade 326 (the direction of the blade edge) is the same as the excavation direction, that is, the direction perpendicular to the vertical axis as shown in FIG. It was. 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 to the outside.
[0059]
The cutting blade 326 is attached as described above. When the cutting edge of the cutting blade 326 is attached at a tangential direction or at an angle inward from the tangential direction, a resistance force is received from the wall surface during excavation, and the excavating part 322 This is because opening is suppressed.
[0060]
A skirt locking portion 330 as shown in FIGS. 12 and 13 is provided at the lower end of the excavation portion 322. A skirt portion 334 is fastened to the skirt locking portion 330 with a bolt 332 or the like, so that the lower end of the excavation portion 322 is prevented from being damaged and the excavation ability of the lower end portion is enhanced.
[0061]
The cutting blade 326 is composed of a parent claw 326a and a child claw 326b. The attachment position of the parent claw 326a is alternately offset for each of the opposing excavation parts 322, and the child claw 326b can be arbitrarily replaced.
[0062]
This is to ensure that the wall surface of the vertical hole is evenly excavated by the two excavating portions facing each other. Since the cutting blade 326 is a commonly used one, details are omitted.
[0063]
A bottom lid 336 is provided at the lower end of the main body member 302 and is configured to be openable and closable around a hinge (not shown) as a central axis, and is provided with a fastener (not shown) and can be kept closed during excavation. Configured as follows. Also, as shown in FIG. 4, eight stabilizer mounting holes 338 for mounting stabilizers (described later) are provided near the upper end of the main body member 302 at equal intervals.
[0064]
In the above-described configuration, except for the mounting position of the cutting blade 326 described above, the excavation apparatus 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, as shown in FIG. 5, the excavator 300 is point-symmetric about the central axis 328 when viewed from above. Therefore, although the above configuration is described on one side, the same configuration is symmetrical with respect to the central axis except for the cutting edge 326 which is offset as described above.
[0065]
The dimensions of each part of the ground drill excavator 300 according to this embodiment are roughly set to a height in the vertical direction of, for example, 3.5 m and a diameter of, for example, 1.1 m. The main body member 302 including the excavation part 322 is formed of a steel plate having a thickness of about 10 mm, for example. The cutting blade 326 is made of hardened hardened steel.
[0066]
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 ground drill excavator 300 according to this embodiment is a cross-sectional view taken along line XVI-XVI in FIG. As shown in FIG. 16, a stabilizer 350 having a substantially C-shaped cross section 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 350 is divided into four parts as shown in order to facilitate attachment and detachment.
[0067]
In this embodiment, the stabilizer 350 has an outer diameter of 1.5 m, for example, but the diameter of the stabilizer 350 is, for example, every 0.1 m to match the diameter of the vertical hole into which the earth drilling excavator 300 is inserted. Several types were prepared. In FIGS. 15 and 16, the excavation part 322 and the like are not shown.
[0068]
FIG. 17 is an explanatory top view of a slide-type stabilizer 360 used in the same application as FIG. As well shown in FIG. 18, which is a cross-sectional view taken along line XVIII-XVIII in FIG. 17, the diameter in the vicinity of the upper end of the main body member 302 is made smaller by the thickness of the slide type stabilizer 360. Two slide shafts 362 are attached to each slide type stabilizer 360, and the slide shaft 362 is slidably accommodated in the slide shaft holder 364 provided in the aforementioned small-diameter portion. Further, a hole (not shown) into which the pin 366 can be inserted is formed at an appropriate position of the slide shaft sliding position of the slide shaft holder 364.
[0069]
The sliding stabilizer is slid manually or using an appropriate hydraulic mechanism (not shown), and insertion holes for pins 366 are formed in the sliding shaft 362 at intervals of, for example, 5 cm. The sliding stabilizer 360 is After moving to a position corresponding to the diameter of the vertical hole into which the drilling device for earth drill 300 is inserted, it is fixed by a pin 366. Note that the stabilizer shown in FIGS. 15 to 17 is provided to cope with fluctuations in the diameter of the vertical hole and is a well-known one, and a detailed description thereof will be omitted.
[0070]
Next, the bottom expanding operation of the excavator 300 will be described.
[0071]
An earth drill excavator 300 according to this embodiment is a relatively small earth drill excavator 400 as shown in FIG. 11 as compared to the earth drill excavator 200 on which the earth drill excavator 100 according to the prior art is mounted. Mounted on.
[0072]
12 is a front view of the excavating section 322 operated (when fully opened) as viewed from the same direction as FIG. 4, FIG. 13 is a side view of the excavator shown in FIG. It is the top view seen from the same direction as FIG. In FIG. 12 and FIG. 14, in order to clearly explain the internal structure, the excavation part 322 existing on the front surface is shown by a broken line so as to be seen through.
[0073]
In the earth drill working machine 400, the operator who rides operates the swing angle of the upper swing body 402, the undulation angle of the boom 404, etc., thereby moving the excavator 300 to the upper position of the excavation position, and then from the winch to the kelly rope. By unwinding 406, the excavator 300 is inserted into the drilled vertical hole by a known drilling bucket or the like.
[0074]
After the insertion, the excavator 300 descends 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 feeding operation of the kelly rope 406 is finished, and the kelly drive 414 is driven to rotate the kelly bar 410.
[0075]
The rotational driving force of the kelly drive 414 is transmitted in the order of the third kelly bar, the second kelly bar, and the inner kelly bar 410i, and the excavator 300 connected to the lower end of the inner kelly bar 410i via the socket 304 or the link 320 is driven to rotate.
[0076]
Since the vertical downward kelly bar push-down force acting from the front frame 412 is acting on the excavator 300, a reaction force is generated from the hole bottom when a downward push force is applied to the kelly bar after arrival at the hole bottom. It is suppressed that 300 falls below the hole bottom position. Therefore, as described above, the Keriba pushing down force is converted to the force in the opening direction of the excavation part 322 via the link 320, and the excavation part 322 is opened.
[0077]
Next, the vertical movement suppressing operation of the slide unit 306 will be described.
[0078]
Here, when a rotation is applied in the excavation direction while applying a pressing force, the slide portion 306 moves the step 318 one step below the slide groove 316 (in FIG. 8, the position of the slide portion 306 that has bitten into the step three steps below). (Shown by a broken line), and the descent below that increment is suppressed. Note that the lowering of the slide portion 306 is not limited to one step, and may be lowered a plurality of steps at a time as necessary.
[0079]
When the socket 304 or the link support part 310 is pushed down, the upper end of the link 320 is pushed down by one step (or an appropriate number of steps), and the excavation part 322 is opened by an appropriate amount according to this step length.
[0080]
In this embodiment, the excavation radius is designed to be changed by, for example, 5 cm every time one increment is changed. Further, the oblique angle θopn (shown in FIG. 13) when the excavation part 322 is opened is designed to be less than 12 ° at the maximum.
[0081]
Since the excavator 300 is also applied with a rotational force in the excavating direction by the kelly drive 414, the excavator 300 rotates while excavating the wall surface with which the cutting blade 322 attached to the excavating part 322 abuts and cutting. Excavation operation of the vertical hole wall surface around the hole bottom. The excavated earth and sand are accommodated in the main body member 302 along the blade surface of the cutting blade 326 and the excavation part 322.
[0082]
Next, when the earth and sand reach the accommodation limit of the main body member 302, the kelly rope 406 is wound up and the excavator is started to be pulled up. As described above, the socket 304, the slide part 306, the first pipe-shaped member 308, and the link support part 310, which are integrally formed, receive upward gravity due to the weight of the main body member 302, and move upward along the slide groove 316. When the pulling force is applied to the upper end of the link 320 by moving, a force in the closing direction of the excavation part 322 around the hinge 324 is applied at the lower end of the link 320, and the excavation part 322 is closed.
[0083]
The step 318 has a shape that suppresses vertical movement only when a rotational force is applied in the excavation direction, so that no rotational force is applied to the slide unit 316 in any step. If the kelly rope 406 is wound up, the excavation part 322 can be closed to the fully closed state.
[0084]
Next, the kelly rope 406 is wound with a winch to raise the kelly bar 410, and the excavator 300 is pulled up to the ground. Next, the upper swing body402 is swung to move the excavator 300 to a position above a predetermined soil discharge position, and the bottom cover 336 is opened and closed to discharge the contained earth and sand.
[0085]
By repeating the above operation, the wall surface can be excavated so as to enlarge the bottom area of the vertical hole as shown in FIG. In FIG. 19 and FIG. 20, only the main parts (a main body member, an excavation part, etc.) of the excavation apparatus 300 are shown, and illustration of each part was simplified. In addition, after an outer kelly bar is drooped to the limit, each kelly bar expands in the order of a third kelly bar, a second kelly bar, and an inner kelly bar 410i, and the excavator 300 reaches the bottom of the vertical hole.
[0086]
In the first embodiment, as described above, the excavation unit 300 is configured to open and close in accordance with the pressing force transmitted from the kelly bar of the earth drill work machine 400 and the reaction force of the pressing force. Therefore, 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 it can be mounted on a relatively small earth drill working machine 400.
[0087]
Next, an excavation device for an earth drill according to a second embodiment of the present invention will be described.
[0088]
In the excavation apparatus for an earth drill according to the second embodiment, as shown by a broken line in FIG. 6, in order to detect the presence of the slide portion 306, for example, a slide type sensor 500 is provided, and an earth drill is provided. ECU 502 is provided at an appropriate position of work implement 400 or excavator 300. The output of the sensor 500 is sent to the ECU 502, and the current opening and excavation radius are displayed on a monitor 504 provided at an appropriate position of a driver's seat (not shown). The remaining configuration is not different from the ground drill excavator according to the first embodiment.
[0089]
In the second embodiment of the present invention, with this configuration, an operator who performs excavation work in a driver's seat (not shown) can check the current opening and excavation radius. As described above, in the excavation apparatus for ground drills according to the first and second embodiments, the excavation radius of the excavation part 322 is changed every time the increment provided in the slide groove 316 is moved. For example, it was designed to be changed by 5 cm.
[0090]
Therefore, by providing the above configuration, excavation accuracy can be increased in addition to the effects achieved by the first embodiment.
[0091]
As described above, the excavator 300 for an earth drill according to the present invention is attached to the lower end of the kelly bar 410i of the earth drill (earth drill working machine 400), and includes the main body member 302 and the excavating part 322 configured to be openable and closable. In the excavating apparatus for an earth drill that enlarges the bottom area of the vertical hole 216, the excavating part operates in accordance with the pressing force transmitted from the earth drill and the reaction force of the pressing force (FIGS. 12 and 13). It was configured as follows.
[0092]
In addition, the main body member 302 has a cylindrical shape, and the excavation portion is a part of the cylindrical shape.
[0093]
The push-down force is transmitted via push-down force transmitting means (link 320) movable in the longitudinal direction of the cylindrical shape inside the main body member, and the push-down force is a force in a direction to open the excavation part. It was configured to be converted to.
[0094]
In addition, the excavation part is configured to be openable and closable with an axis (in the rotation center axis of the hinge 320) in the main body member parallel to the cylindrical longitudinal central axis of the main body member as a center line.
[0095]
Further, the excavation part is configured to include a plurality of cutting members (cutting blades 326) so that the distal ends protrude in the excavation rotation direction of the main body member.
[0096]
In addition, the push-down force transmitting means includes a groove portion (slide groove 316) provided in the longitudinal direction of the cylindrical shape in a portion other than the excavation portion of the main body member, and a longitudinal portion in the vicinity of the upper portion in the cylindrical longitudinal direction of the main body member. A connecting member (sliding portion 306) that has a socket 304 connected to the lower end of the Kelly bar on the central axis in the direction, and is movable in the longitudinal direction along the groove, and the connecting member toward the lower side of the connecting member; A first shaft portion (first pipe-shaped member 308) having a hollow portion and a push-down force transmission member (link support portion) integrally provided around the first shaft portion, which are integrally formed 310), a second shaft portion 312 having one end inserted into the first shaft portion and configured to be movable in the longitudinal direction in the range up to the vicinity of the lower end of the main body member, and Provided at an appropriate position of the tubular, a bearing portion 314 for locking the lower end of the second shaft portion, it was formed from.
[0097]
Further, the push-down force transmitting means and the excavation portion have movable end portions around two intersecting axes at both ends, and a push-down force conversion that is rotatable in the twist direction between the end portions. It is configured to be connected to the push-down force transmission member by a portion (link 320).
[0098]
Further, the main body member is configured to include a lid (bottom lid 336) attached to the bottom of the main body so as to be opened and closed.
[0099]
Moreover, it comprised so that the excavation auxiliary member (skirt part 334) might be provided in the lower end of the said excavation part.
[0100]
Moreover, the said groove part was comprised so that the notch 318 for suppressing the fall of the said connection member might be provided.
[0101]
In addition, a detection means (sensor 500) for detecting the position of the push-down force transmission member is provided in the cylindrical shape of the main body member.
[0102]
In addition, although it was set as the structure which attaches the said cutting blade 326 to the said excavation part 322, it replaces with a cutting blade and you may attach excavation members, such as a scraper (not shown), according to the condition of excavation.
[0103]
Moreover, although the said step 318 was made into the shape which suppresses a vertical motion, you may make it the shape which suppresses only a fall, for example.
[0104]
【The invention's effect】
According to the first aspect of the present invention, 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 that can be mounted on a relatively small earth drill working machine. An apparatus can be provided.Furthermore, the pressing force of the earth drill can be transmitted to the excavation part more efficiently. According to the second aspect of the present invention, 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 drilling that can be mounted on a relatively small earth drill working machine An apparatus can be provided. Furthermore, the amount of excavation can be controlled with high accuracy.
[0105]
Claim3In addition to the above-described effects, the excavator can quickly reach the bottom of the hole.
[0106]
Claim4In the section, oil for opening and closing the excavation partPressureA drilling device that opens and closes a drilling unit without using the device can be provided, and a pressing force of the earth drill can be efficiently converted into a force required for the operation of the drilling unit.
[0107]
Claim5In the above section, 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 further requires the earth drill push-down force to operate the drilling unit more efficiently. And the drilling rig can quickly reach the bottom of the hole.
[0108]
Claim6In the above section, 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 it is possible to efficiently perform a drilling operation.
[0110]
According to the seventh aspect of the present invention, 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 it is possible to more efficiently reduce the pressing force of the ground drill. It can be converted into the force required for movement.
[0111]
According to the eighth aspect, 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 it is possible to perform a drilling operation more efficiently.
[0114]
Claim9In the section, the person who performs the work can detect the current opening of the excavation part.According to the tenth aspect of the present invention, it is possible to provide a drilling device that can open and close a drilling unit without using a hydraulic device for opening and closing the drilling unit, and to be mounted on a relatively small earth drill working machine. Can be provided. Furthermore, the excavation part can be prevented from being damaged and the excavation ability can be enhanced.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a configuration of a hydraulic earth drill excavator according to the prior art.
2 is a sectional view taken along line II-II in FIG.
FIG. 3 is an explanatory diagram in which the hydraulic earth drill excavator shown in FIG. 1 is mounted on an earth drill working machine;
FIG. 4 is a front view of the ground drilling excavator according to the present invention as seen from the horizontal direction.
5 is a top view showing the ground drill excavator shown in FIG. 4 as viewed from above. FIG.
6 is a front partial cross-sectional view showing the internal structure of the excavator for an earth drill shown in FIG. 4;
7 is a side sectional view of the ground drilling excavator shown in FIG. 4 as viewed from the side of 90 °. FIG.
FIG. 8 is a partial explanatory view illustrating the groove structure of the ground drill excavator shown in FIG. 4;
9 is a partial cross-sectional view for explaining a connection structure of a push-down force conversion portion (link) of the ground drill excavator shown in FIG. 4. FIG.
FIG. 10 is a partial cross-sectional view of FIG. 9 viewed from the 90 ° side.
11 is an explanatory view showing a state in which the ground drill excavator shown in FIG. 4 is mounted on a small earth drill. FIG.
FIG. 12 is a front view of the ground drill excavating device according to the present invention as viewed from the front in the horizontal direction in a state where the excavating portion is opened.
13 is a side view of the excavator shown in FIG. 12 as viewed from the side of 90 °. FIG.
14 is a top view of the ground drill excavator shown in FIG. 12 as viewed from the vertical direction in a state where the excavation section is opened.
FIG. 15 is an explanatory top view showing a configuration of a stabilizer attached near the upper end of the main body member 302;
16 is a cross-sectional view taken along line XVI-XVI in FIG.
17 is an explanatory top view showing a configuration of a slide type stabilizer mechanism provided in the vicinity of the upper end of the main body member 302. FIG.
18 is a cross-sectional view taken along line XVIII-XVIII in FIG.
FIG. 19 is an explanatory diagram for explaining excavation work of the ground drill excavator shown in FIG. 12;
20 is an explanatory diagram for explaining excavation work of the excavator for earth drill shown in FIG. 12 in a state in which the excavation part is opened.
[Explanation of symbols]
300 drilling equipment
302 Main body member
304 socket
306 Slide part (connection member)
308 First pipe-shaped member
310 Link support (pressing force transmission member)
312 Second pipe member
314 Bearing part
316 Slide groove
318 steps
320 link (push-down force converter)
322 excavation part
324 Hinge
326 cutting blade
336 Bottom cover
400 Earth drill work machine
410 Keriba

Claims (10)

In an earth drill excavator that is attached to the lower end of a kelly bar of an earth drill and includes a cylindrical main body member and an excavating part configured to be openable and closable, the excavating part includes a push-down force. The push-down force from the earth drill and the reaction force of the push-down force are transmitted through the transmission means and operate. The push-down force transmission means includes a groove portion provided in the longitudinal direction of the cylindrical shape of the main body member. A connecting member connected to the lower end of the kelly bar and movable in the longitudinal direction along the groove, a first shaft portion integrally formed with the connecting member toward the lower side of the connecting member, The longitudinal force direction member is integrally provided around the first shaft portion, and is connected to the first shaft portion and in the range up to the vicinity of the lower end of the main body member. An earth drill comprising: a second shaft portion configured to be movable; and a bearing portion provided at an appropriate position of the cylindrical shape and locking a lower end of the second shaft portion. Drilling rig. An earth drill excavation apparatus which is attached to a lower end of a kelly bar of an earth drill and includes a cylindrical main body member and an excavating portion configured to be openable and closable to expand a bottom area of a vertical hole. A groove provided in the longitudinal direction, a connection member connected to the lower end of the kelly bar and movable in the longitudinal direction along the groove, and a vertical movement of the connection member provided in the groove. The excavation part is configured to be operated by receiving a pressing force from the earth drill and a reaction force of the pressing force through the connection member. Earth drilling rig. The ground excavation device according to claim 1, wherein the excavation part constitutes a part of the cylindrical shape. The push-down force transmitting means is movable in the longitudinal direction, and the push-down force is converted to a force in a direction to open the excavation part via the push-down force transmission means and transmitted to the excavation part. The excavator for an earth drill according to claim 1. The said excavation part was comprised so that opening and closing was possible by making the axis line in the main body member parallel to the said cylindrical longitudinal center axis | shaft of the said main body member into a centerline. The excavator for earth drills described in 1. The ground excavation device according to any one of claims 1 to 5, wherein the excavation part includes a plurality of cutting members so that the distal ends protrude in the excavation rotation direction of the main body member. Further, the movable connection mechanism about an axis perpendicular axis thereto around said longitudinal, has the connection mechanism at both ends, depressed is rotatable relative Oite twisting direction during the connection mechanism 2. The excavation for an earth drill according to claim 1 , further comprising a force conversion unit, wherein the push-down force transmission means and the excavation unit are configured to be connected via the push-down force conversion unit. apparatus. The excavator for an earth drill according to any one of claims 1 to 7, wherein the main body member includes a lid portion that is attached to a bottom portion of the main body member so as to be openable and closable. The excavator for an earth drill according to claim 1, wherein a detecting means for detecting the position of the push-down force transmitting member is provided inside the cylindrical shape of the main body member. A drilling device for an earth drill, which is attached to the lower end of a kelly bar of an earth drill and includes a main body member and an excavating part configured to be openable and closable, and has a drilling auxiliary member at the lower end of the excavating part. An excavation device for an earth drill, comprising: the excavation unit configured to operate according to a pressing force transmitted from the earth drill and a reaction force of the pressing force.

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