JP2017095987A - Attachment for doughnut auger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of enabling an existing earth auger or an existing hollow rotary device to be effectively utilizable as a doughnut auger that is a double screw drill, in an attachment for the doughnut auger, in the present invention.SOLUTION: In an attachment for normally rotating-reversely rotating a cylindrical casing 5 penetrated into the ground and a main spindle 3 penetrated into the ground in an inside central part of the casing so as to mutually negate reaction torque, the attachment 1 for a doughnut auger is provided for normally rotating by transmitting rotational driving force by a driving device of a ground-penetration device to any one of the casing 5 and the main spindle 3 and reversely rotating by transmitting reverse rotational driving force converted from the rotational driving force of the ground-penetration device via a reverse rotation transmission device 6 to any other of the casing 5 and the main spindle 3.SELECTED DRAWING: Figure 1-A

Description

  The present invention is an existing drilling machine for civil engineering / architecture, such as underwater / underground obstacle destruction, earth retaining, various foundation piles, excavation, drilling of existing structures, pile removal, etc. The present invention relates to an attachment that is mounted on an earth auger or a hollow rotary press machine and functions as a donut auger.

  The donut auger is a double screw type foundation pile drilling machine that excavates the ground with an inner screw and an outer screw (casing) that are reversed to each other. The inner screw and the outer outer screw (casing) are simultaneously reversely rotated to cancel each other's reaction torque, and no vibration and noise occur, and the outer screw (casing) does not collapse the hole wall. Stable drilling is possible. As such a double screw foundation pile drilling machine, a ground excavation device described in Patent Document 1 is known as a conventional example.

  According to the donut auger, it was difficult to excavate hard ground only by press-fitting with a conventional casing, and that the conventional auger alone had collapsed the hole wall in soft ground, gravelly soil, etc. The conventional inconvenience is solved.

JP 2005-336703 A

  However, a conventional donut auger has two essential parts, a central auger and an outer screw (casing, etc.) that rotates in the opposite direction in one punching device. As a drilling machine that is expensive and has only one of the auger and the outer screw, for example, the existing earth auger or the existing hollow rotating device for rotating the outer screw cannot be effectively used. .

  Therefore, if a simple attachment can be used as a donut auger by interposing it in the existing auger or existing hollow rotating device, it can be made a donut auger at a low cost. The versatility of the existing auger and the hollow rotating device is enhanced and it is effectively used. The donut auger attachment according to the present invention has been proposed to solve such problems.

  SUMMARY OF THE INVENTION The gist for solving the above-mentioned problems of the attachment for a donut auger according to the present invention is to provide a reaction torque between a cylindrical casing that penetrates into the ground and a main shaft that penetrates into the ground at the inner central portion of the casing. Is an attachment that rotates forward / reversely so as to cancel each other, and transmits the rotational driving force by the driving device of the ground penetration device to either the casing or the main shaft to rotate it forward, and the ground penetration device The rotational driving force is transmitted through the reverse rotation transmission device to either the casing or the main shaft, and the reverse rotation driving force is transmitted to rotate in the reverse direction.

  The gist for solving the above-mentioned problems of the attachment for a donut auger according to the present invention is to provide a drive shaft of a ground penetrating device that rotationally drives a main shaft that penetrates the ground, and a head of the main shaft. A connecting shaft that directly connects the drive shaft and the main shaft at the center of the device, and a reverse rotation through a reverse rotation transmission device by forward rotation of the connecting shaft. A reaction force board that is fixed to the ground penetration device, comprising a casing rotation device that is fixed to the casing head and reversely rotates the casing, the connecting shaft, a reverse rotation transmission device, and a casing rotation device. And is driven as a donut auger by a main shaft that is normally rotated by the drive shaft and an outer casing that is rotated reversely by the casing rotating device.

  Furthermore, the gist for solving the above-mentioned problems of the attachment for a donut auger according to the present invention is to provide a rotation drive unit of a ground penetrating device for gripping and rotating a cylindrical casing for ground penetration with a gripping device; , A device disposed between the inner central part of the casing and interposed between the head of the main shaft penetrating into the ground, which is fixed to the head of the casing and rotates together with the casing And a connecting shaft for a main shaft that is reversely rotated through a reverse rotation transmission device by forward rotation of the rotating device and whose shaft end is connected to the head of the main shaft to reversely rotate the main shaft, and the rotating device And a reverse force transmission device and a reaction force base plate that is fixed to a part of the ground penetrating device and that is forwardly rotated by the ground penetrating device. In the spindle is reversely rotated by a connecting shaft for the main shaft is to be driven as a donut auger.

  It includes that the connecting shaft or the connecting shaft for the main shaft in the central portion of the device is movable in the vertical direction by a cylinder device provided on the reaction force substrate.

  According to the attachment for a donut auger of the present invention, by installing this attachment to an existing earth auger or an existing hollow rotating device, double ground excavation of the main shaft penetrating into the ground and the casing is possible. Thus, an excellent effect that the donut auger advanced excavation method becomes possible is achieved.

It is the top view (A) of the attachment 1 for donut augers which concerns on this invention, and the longitudinal cross-sectional view (B) seen from the front. It is the top view (B) seen from the top view (A) of the attachment 1a for donut augers which concerns on this invention from the front. It is the top view (B) seen from the top view (A) of the attachment 1b for donut augers which concerns on the same invention from the front. It is the top view (B) seen from the top view (A) of the attachment 1c for donut augers which concerns on this invention from the front. It is a disassembled perspective view of the reverse rotation transmission device 6 and the casing rotation device 7 in the attachment 1 for a donut auger according to the present invention. It is a longitudinal cross-sectional view of the assembly state of the reverse rotation transmission device 6 and the casing rotation device 7. It is a schematic block diagram which makes the drive shaft 4 of the existing earth auger interpose the attachment 1 for donut augers which concerns on this invention, and makes the main shaft 3 and the casing 5 reversely rotate mutually. It is a schematic block diagram which makes the existing hollow rotating apparatus 6 interpose the attachment 1a for donut augers which concerns on this invention, and makes the main shaft 3 and the casing 5 reversely mutually rotate.

  As shown in FIGS. 1A and 1B, a donut auger attachment 1, 1a according to the present invention uses an existing earth auger or an existing hollow rotating device as a double screw type foundation pile drilling machine. It is an attachment that allows it to be used as a donut auger.

  An attachment 1 for a donut auger according to the present invention includes, as shown in FIGS. 1-A (A) and (B), a casing 4 that is a cylindrical outer screw that penetrates into the ground, and an inner central portion of the casing 4. It is an attachment that rotates the main shaft 3 as a screw penetrating into the ground in the forward and reverse directions so as to cancel the reaction torque with each other.

  Then, the rotational driving force by the driving device of the ground penetration device such as an existing earth auger is transmitted to either the casing 4 or the main shaft 3 for normal rotation, and the rotational driving force of the ground penetration device is transmitted. A reverse rotation driving force is transmitted to either the casing 4 or the main shaft 3 via the reverse rotation transmission device 6 for reverse rotation.

  The structure of the attachment 1 for the donut auger is provided between a drive shaft 4 of a ground penetrating device (earth auger, not shown) for rotating the main shaft 3 penetrating into the ground and a head 3 a of the main shaft 3. A bearing portion 2b fixed to a reaction force bar 2 of a flat rectangular body as a reaction force substrate for directly connecting the drive shaft 4 and the main shaft 3 at the center of the device. The connecting shaft 2a is supported by the bearing portion 2b.

  The connecting shaft 2a is rotatably supported by a bearing portion 2b provided at the center of the apparatus (center of the reaction force bar 2). A sun gear 2c is integrally provided in the middle of the connecting shaft 2a in the vertical direction, and rotates in the same direction together with the connecting shaft 2a.

  At the lower part of the connecting shaft 2a, there is provided a fitting portion 2d that is fitted to the head portion 3a of the main shaft (screw shaft) 3 for drilling the ground and rotates integrally. The connecting shaft 2a is vertically divided with respect to the reaction force bar 2, and one divided body is inserted and fitted into the bearing portion 2b, and is fitted to the other divided body, and these are integrated with each other. To conclude.

  As shown in FIG. 1-A, FIG. 2-C, and FIG. 2-D, the forward rotation of the connecting shaft 2a and the sun gear 2c causes reverse rotation via the reverse rotation transmission device 6, and the casing 5 There is a casing rotating device 7 which is fixed to the head 5a and integrally rotates the casing 5 in the reverse direction.

  As shown in FIG. 2C, the reverse rotation transmission device 6 includes a support member 6a that is a circular flat plate that is installed on the suspension member 2e of the reaction force bar 2, and the support member 6a in the circumferential direction. A pair of stoppers 6c arranged at intervals and an idler 6b rotatably supported by a shaft support portion 6d.

  The idler 6b is disposed so as to be engaged between the sun gear 2c and the internal teeth 7c of the internal gear 7b in the casing rotating device 7. A shaft portion at the center of the idler 6b protrudes from the through hole on the upper surface of the support member 6a, and is stopped by a stopper 6c and a shaft support portion 6d so as not to come out downward.

  The idler 6b rotates in the reverse direction of the sun gear 2c and the internal gear 7b, and does not revolve around the sun gear 2c. .

  As shown in FIGS. 2C and 2D, the casing rotating device 7 includes a rotation transmission ring 7a fixed by a bolt inserted through a through hole of the head portion 5a of the casing 5 and a fastening nut. And the rotation transmission ring 7a and an annular internal gear 7b integrated by bolting or the like.

  As shown in FIG. 2D, the internal gear 7b is suspended from the rotation support 6e via a bearing or the like so as to be freely rotatable. The rotation support portion 6e is fastened and fixed to the support member 6a with bolts or the like.

  Further, the support member 6a is fixed with a bolt or the like via a suspension member 2e suspended from the reaction force bar 2 shown in FIG. In this way, the rotation transmission ring 7a and the internal gear 7b are suspended from the reaction force bar 2 and the support member 6a so as to be rotatable. Internal teeth 7c are engraved on the inner peripheral wall surface of the internal gear 7b.

  The inner gear 7b and the rotation transmission ring 7a are integrally rotated by the rotation of the idler 6b meshing with the inner teeth 7c, so that the outer casing 5 is rotated in the same direction as the inner gear 7b. .

  As described above, the donut auger attachment 1 according to the present invention includes the connection shaft 2a, the reverse rotation transmission device 6, and the casing rotation device 7, and the existing ground penetration device (not shown). And a reaction force substrate 2 fixed to the substrate.

  Then, the main shaft 3 that is normally rotated in the same direction via the connecting shaft 2 a by the drive shaft 4 that is normally rotated by a motor or the like that is a drive source of the ground penetration device and the casing rotation device 7 are reversed. The outer casing 5 that is rotated is driven as a donut auger.

  In this way, the existing ground penetration device that allows only the earth auger to penetrate the ground can be used as a donut auger that is a double drilling machine of the earth auger and the casing by the attachment 1 according to the present invention. Is.

  In the second embodiment according to the present invention, the hollow rotating device 9 for rotating the existing casing 5 shown in FIG. 4 and penetrating into the ground is used as the donut auger with the attachment 1a according to the present invention.

  The donut auger attachment 1a includes a ground penetrating device (not shown) that is a hollow rotating device 6 that is gripped by a gripping device 8 and rotationally driven, as shown in FIG. 1-B. It is a device that is interposed between the rotation drive unit and the head of the main shaft 3 that is disposed at the inner central portion of the casing 5 and penetrates into the ground.

  As shown in FIG. 1-B, a rotation transmission ring 7a, which is an annular rotation device that is fixed to the head of the casing 5 and rotates together with the casing 5, and a reverse rotation transmission device 6 by forward rotation of the rotation device. And the shaft end fitting portion 2d is connected to the head of the main shaft 3 to reversely rotate the main shaft 3, and the rotation transmission ring 7a of the rotating device and the reverse It is comprised by the reaction force board | substrate (reaction force bar) 2 which comprises the rotation transmission device 6 and the said connecting shaft 2f for main shafts, and is fixed to a part of said ground penetration apparatus.

  The casing 5 gripped by the gripping device 8 by the hollow rotating device 9 rotates in the clockwise direction indicated by the arrow in the figure. Then, since the rotation transmission ring 7a fixed to the head 5a of the casing 5 rotates in the same direction, the internal gear 7b also rotates integrally in the same direction.

  By the rotation of the internal gear 7b, a pair of idlers 6b and 6b meshing with the internal teeth 7c are also rotated clockwise. The sun gear 2c meshing with the idler 6b is rotated counterclockwise by the rotation of the idler 6b.

  By rotating the sun gear 2c, the main shaft connecting shaft 2f rotates integrally, and the main shaft 3 in which the head 3a is fitted to the lower fitting portion 2d of the main shaft connecting portion 2f is counteracted. Rotate clockwise to penetrate it into the ground. Since the large-diameter casing 5 is driven to rotate and the small-diameter main shaft 3 is rotated, the rotational driving load increases. Therefore, an auxiliary motor for assisting the rotational drive of the casing 5 may be provided on the shaft support portion 6d of the idler 6b.

  In this way, the casing 5 that is rotated forward in the clockwise direction by the hollow rotating device 9 that is the ground penetration device, and the main shaft 3 that is reversely rotated by the main shaft connecting shaft 2 f via the reverse rotation transmitting device 6. It can be driven as a donut auger.

  As shown in FIGS. 2A and 2B, the third embodiment according to the present invention is configured such that the cylinder 10 is provided on the reaction bar 2 and the connecting shaft 2a or the main shaft connecting shaft 2f is used as a gear case. Apart from that, it is configured to slide up and down.

  By doing so, the connecting shaft 2a that is the central axis of the attachment center shown in FIG. 2-A or the main shaft connecting shaft 2f that is the central axis shown in FIG. 2-B is slid in the vertical direction. be able to.

  By driving the rod of the cylinder 10, the connecting shaft 2a of the central shaft and the connecting shaft 2f for the main shaft are moved in the vertical direction, and, for example, in the example shown in FIG. It is possible to excavate the ground ahead of the other, thereby loosening the ground and facilitating the drilling of the casing 5 later. Further, in the example shown in FIG. 2B, the main shaft 3 is pulled up by the cylinder 10 and the ground drilling by the casing 5 is preceded, thereby loosening the ground and the main shaft 3 in the back attack. Can be easily drilled.

  Further, if a drive motor is provided integrally with the shaft support portion 6d of the reverse rotation transmission device 6, the spindle 3 and the casing 5 can be drilled with only the attachment 1.

  According to the attachment for a donut auger according to the present invention, it can be easily applied to an existing earth auger or hollow rotating device and converted into a donut auger.

1,1a, 1,1c Donut auger attachment,
2 reaction force bar (reaction force substrate), 2a connecting shaft,
2b bearing part, 2c sun gear,
2d fitting part, 2e suspension member,
2f Connecting shaft for main shaft,
3 spindle (inner screw), 3a head,
4 Drive shaft,
5 casing (outside screw),
5a head,
6 reverse rotation transmission device, 6a bearing member,
6b idler, 6c stop,
6d shaft support, 6e rotation support,
7 Rotating device for casing, 7a Rotation transmission ring,
7b internal gear, 7c internal teeth,
8 gripping device,
9 hollow rotating device,
10 cylinders, 10a rods,
11 Connecting plate.

Claims (4)

An attachment that rotates a cylinder-shaped casing penetrating into the ground and a main shaft penetrating into the ground at the inner central portion of the casing in a forward and reverse direction so as to cancel each other's reaction torque,
The rotational driving force by the driving device of the ground penetration device is transmitted to either the casing or the main shaft for normal rotation, and the rotational driving force of the ground penetration device is transmitted to the casing or the main shaft via the reverse rotation transmission device. Or reverse rotation by transmitting reverse rotation driving force to the other,
An attachment for a donut auger. A device interposed between a drive shaft of a ground penetrating device that rotationally drives a main shaft that penetrates into the ground, and a head of the main shaft,
A connecting shaft that directly connects the drive shaft and the main shaft at the center of the apparatus;
A casing rotation device that is reversely rotated through a reverse rotation transmission device by forward rotation of the connecting shaft and fixed to the casing head to reversely rotate the casing;
The connecting shaft, a reverse rotation transmission device, and a casing rotation device are provided, and the reaction force substrate is fixed to the ground penetration device.
Driving as a donut auger with a main shaft that is normally rotated by the drive shaft and an outer casing that is reversely rotated by the casing rotating device;
An attachment for a donut auger. Between the rotation driving part of the ground penetrating device that grips and rotates the cylindrical casing that penetrates the ground with the gripping device, and the head of the main shaft that is disposed at the inner central part of the casing and penetrates the ground A device to be mounted,
An annular rotating device fixed to the casing head and rotating together with the casing;
A main shaft connecting shaft that is reversely rotated through a reverse rotation transmission device by forward rotation of the rotating device and whose shaft end is connected to the head of the main shaft to reversely rotate the main shaft;
The rotating device, the reverse rotation transmission device, and a reaction force substrate that is fixed to a part of the ground penetration device and includes the main shaft connecting shaft,
Driving as a donut auger with a casing that is normally rotated by the ground penetration device and a main shaft that is reversely rotated by the connecting shaft for the main shaft;
An attachment for a donut auger. The connecting shaft or the connecting shaft for the main shaft at the center of the device is movable in the vertical direction by a cylinder device provided on the reaction force substrate,
The attachment for a donut auger according to claim 2 or 3.

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