Drilling equipment

Abstract

To provide a drilling device that allows for easy modification of the drilling diameter. [Solution] In an excavation device, a drilling head provided at the lower end of the auger is equipped with a large-diameter expanding wing 3 that rotates between an outwardly open expanded position and a contracted position that is more retracted than the expanded position, the large-diameter expanding wing 3 is maintained in the contracted position when the auger rotates forward, and the large-diameter expanding wing 3 rotates from the contracted position to the expanded position when the auger rotates backward, and the device has a detachable key 7 that restricts the rotation range of the large-diameter expanding wing 3 at a position between the minimum contracted position and the maximum expanded position of the large-diameter expanding wing 3.

Description

[Technical Field]

[0001] The present invention relates to a drilling device provided with expanding blades. [Background Art]

[0002] As a drilling device for enlarging and excavating the tip of a pile hole formed in the ground to form a root fixing part, for example, there is an expanding excavator described in Patent Document 1. The expanding excavator described in Patent Document 1 is used by being connected to the tip of a drilling rod so as to rotate integrally with the drilling rod. This expanding excavator includes a hollow drive shaft communicating with the drilling rod, two helical drilling blades provided on the outer periphery of the drive shaft, drilling bits attached to the tip of each drilling blade, and two expanding blades provided along the spiral of each drilling blade and configured to be switchable between a diameter-expanded state and a diameter-contracted state.

[0003] The two expanding blades are swingably supported by pins on blade support parts continuously provided to the drilling blades. In this expanding excavator, during pile hole excavation where the drilling rod is rotated forward, most of the expanding blades are accommodated in the rotation trajectory of the drilling blades due to earth pressure, resulting in a diameter-contracted state; when the drilling rod is rotated reversely, the expanding blades receive earth pressure and swing around the pins, resulting in a diameter-expanded state where the expanding blades protrude radially outward beyond the rotation trajectory of the drilling blades. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2011-214366 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] In the above-described enlarged excavation device, when the enlarged wing oscillates around the pin under earth pressure and reaches an enlarged diameter state, it is confirmed that the enlarged wing has fully opened by crushing the confirmation member. In other words, during enlarged excavation, the enlarged wing oscillates until it contacts and crushes the confirmation member, so the range of oscillation is fixed, and the enlarged excavation diameter will always be the same and cannot be changed.

[0006] Therefore, the objective of the present invention is to provide a drilling device that can easily change the enlarged drilling diameter. [Means for solving the problem]

[0007] The present invention relates to an excavation device in which an expanding blade is provided on an excavation head located at the lower end of an auger, and the expanding blade rotates between an outwardly open expanded position and a contracted position that is more retracted than the expanded position, and when the auger rotates forward, the expanding blade is maintained in the contracted position, and when the auger rotates backward, the expanding blade rotates from the contracted position to the expanded position, and the device further includes a detachable restricting member that restricts the rotation range of the expanding blade at a position between the minimum contracted position and the maximum expanded position of the expanding blade.

[0008] According to the drilling apparatus of the present invention, by attaching a regulating member corresponding to the desired enlarged drilling diameter, the rotation range of the enlargement blade can be set to any position between the minimum retracted position and the maximum enlarged position of the enlargement blade.

[0009] Here, the regulating member can be a key attached to the surface that contacts the expanding wing when it is in its maximum expanded position. This allows the rotation range of the expanding wing to be set to any position between the minimum retracted position and the maximum expanded position by attaching a key corresponding to the desired expanded drilling diameter.

[0010] Furthermore, the regulating member can be a wire with one end fixed to the expanding blade and the other end fixed to the rotating rod side of the drilling head. This allows the rotation range of the expanding blade to be set to any position between the minimum retracted position and the maximum expanded position of the expanding blade by attaching a wire of a length corresponding to the desired expanded drilling diameter.

[0011] Furthermore, the regulating member can consist of a wing support that rotatably supports the expanding wing, a pin detachably fixed to one side of the expanding wing with a changeable fixing position, and a groove provided on the other side with a groove through which the pin slides. This allows the rotation range of the expanding wing to be set to any position between the minimum retracted position and the maximum expanded position by attaching the pin to a position corresponding to the desired expanded excavation diameter. [Effects of the Invention]

[0012] (1) By having a detachable restricting member that restricts the rotation range of the expanding wing at a position between the minimum retracted position and the maximum expanded position of the expanding wing, the rotation range of the expanding wing can be set at a position between the minimum retracted position and the maximum expanded position of the expanding wing, thereby easily changing the expanded excavation diameter, by replacing the restricting member with one that corresponds to the expanded excavation diameter to be changed.

[0013] (2) The regulating member is a key that is attached to the surface that the expanding wing contacts when it is in the maximum expansion position, so that the expanding digging diameter can be easily changed by replacing it with a key corresponding to the expanding digging diameter to be changed.

[0014] (3) The regulating member is a wire with one end fixed to the expanding wing and the other end fixed to the rotating rod side of the drilling head, so that the expanded drilling diameter can be easily changed by replacing it with a wire of a length corresponding to the expanded drilling diameter to be changed.

[0015] (4) The regulating member consists of a wing support that rotatably supports the expanding wing, a pin that is detachably fixed to one of the expanding wing and whose fixing position can be changed, and a groove provided on the other side through which the pin slides. By changing the fixing position of the pin to a position corresponding to the desired expanded excavation diameter, the expanded excavation diameter can be easily changed. [Brief explanation of the drawing]

[0016] [Figure 1]It is a plan view of the lower element of the auger of the drilling device according to the embodiment of the present invention. [Figure 2] It is a left side view of the lower element in FIG. 1. [Figure 3] It is an enlarged view of part A in FIG. 1. [Figure 4] It is an enlarged view of part A in FIG. 1 when a first key is attached. [Figure 5] It is an enlarged view of part A in FIG. 1 when a second key is attached. [Figure 6] It is an enlarged view of part A in FIG. 1 showing an example where a wire rod is used as the regulating member. [Figure 7] It is an enlarged view of part A in FIG. 1 showing an example where a pin is used as the regulating member. MODE FOR CARRYING OUT THE INVENTION

[0017] FIG. 1 is a plan view of the lower element of the auger of the drilling device according to the embodiment of the present invention, and FIG. 2 is a left side view of the lower element in FIG. 1.

[0018] The auger of the drilling device in the present embodiment is constituted by a plurality of elements. The lower element 1 shown in FIG. 2 is attached to the lowermost side of the auger. The lower element 1 is provided with a drilling head 2 at a lower end thereof. The drilling head 2 is provided with a large-diameter expanding blade 3 and a small-diameter expanding blade 4 as expanding blades that rotate between an expanded position opened outward and a contracted position contracted more than the expanded position. The small-diameter expanding blade 4 is provided above the large-diameter expanding blade 3. A connection portion 6 for connecting to an upper element is provided at an upper end portion of the lower element 1.

[0019] The large-diameter expanding blade 3 is rotatably supported by a blade support portion 12 provided on a rotating rod 11 of the drilling head 2. The large-diameter expanding blade 3 is attached to the blade support portion 12 so as to be rotatable about a support shaft 12A. A drilling claw 13 is provided at a tip end of the large-diameter expanding blade 3.

[0020] The small-diameter enlarged blade 4 is rotatably supported by a blade support portion 22 provided on the rotating rod 11. The small-diameter enlarged blade 4 is attached to the blade support portion 22 so as to be rotatable about a support shaft 22A. A drilling claw 23 is provided at the tip of the small-diameter enlarged blade 4.

[0021] When the auger rotates forward, the large-diameter enlarged blade 3 and the small-diameter enlarged blade 4 are maintained at the retracted position, and when the auger rotates reversely, the large-diameter enlarged blade 3 and the small-diameter enlarged blade 4 are displaced from the retracted position to the expanded position. In FIG. 1 and FIG. 2, the large-diameter enlarged blade 3 at position A is at the maximum expanded position, and the large-diameter enlarged blade 3 at position B is at a position between the minimum retracted position and the maximum expanded position. Further, the small-diameter enlarged blade 4 at position C is at the minimum retracted position, and the small-diameter enlarged blade 4 at position D is at the maximum expanded position. The large-diameter enlarged blade 3 is configured such that the diameter for expanded excavation is larger than that of the small-diameter enlarged blade 4.

[0022] When forming a root compacting bulb portion with the drilling device configured as described above, first, the auger and the drilling head 2 are rotated forward (rotated clockwise in FIG. 1) to drill downward. When the downward drilling is completed, the auger is then rotated reversely and pulled upward. Then, the small-diameter enlarged blade 4 and the large-diameter enlarged blade 3 are sequentially displaced to the expanded position to perform expanded excavation.

[0023] Next, the case where the expanded excavation diameter is changed in the above drilling device will be described. FIG. 3 is an enlarged view of part A in FIG. 1, FIG. 4 is an enlarged view of part A in FIG. 1 when a first key is attached, and FIG. 5 is an enlarged view of part A in FIG. 1 when a second key is attached.

[0024] As shown in FIG. 3, when the large-diameter enlarged blade 3 is at the maximum expanded position, its rotation range is restricted by abutting against the wall surface 12B of the blade support portion 12. A fixing hole 12C for fixing the first key 7 shown in FIG. 4 and the second key 8 shown in FIG. 5 is formed in the wall surface 12B of the blade support portion 12. The first and second keys 7 and 8 are restriction members for changing the expanded excavation diameter by restricting the rotation range of the large-diameter enlarged blade 3 at a position between the minimum retracted position and the maximum expanded position of the large-diameter enlarged blade 3.

[0025] The first and second keys 7 and 8 are trapezoidal steel blocks in plan view. The first and second keys 7 and 8 are detachably attached to the wall surface 12B of the wing support 12. The first and second keys 7 and 8 have male screw holes 70 and 80 formed in the fixing surfaces 71 and 81 that abut and fix to the wall surface 12B, respectively. The first and second keys 7 and 8 are each fixed to the male screw holes 70 and 80 by bolts (not shown) through fixing holes 12C.

[0026] The first and second keys 7 and 8 have regulating surfaces 72 and 82 on the opposite sides of their respective fixed surfaces 71 and 81, which restrict the rotation range of the large-diameter expanding wing 3. The position and angle of the regulating surfaces 72 and 82 relative to the fixed surfaces 71 and 81 are adjusted according to the desired enlarged drilling diameter. For example, the first key 7 restricts the large-diameter expanding wing 3 to an angle of 25° with respect to the wall surface 12B of the wing support 12. Similarly, the second key 8 restricts the large-diameter expanding wing 3 to an angle of 25° with respect to the wall surface 12B of the wing support 12.

[0027] If the first and second keys 7 and 8 described above are not used, the large-diameter expanding wing 3 rotates to the maximum expansion position, i.e., until it contacts the wall surface 12B of the wing support 12, thereby maximizing the expanded drilling diameter. On the other hand, by attaching the first key 7 or the second key 8 according to the desired expanded drilling diameter, the rotation range of the large-diameter expanding wing 3 is restricted, and it only rotates until it contacts the restricting surfaces 72 and 82 of the first or second key 7 and 8, thus limiting the expanded drilling diameter.

[0028] Therefore, in the drilling device of this embodiment, by replacing the first and second keys 7 and 8 according to the desired enlarged drilling diameter, the rotation range of the large-diameter enlarged blade 3 can be set at a position between the minimum contraction position and the maximum enlargement position of the large-diameter enlarged blade 3, making it possible to easily change the enlarged drilling diameter.

[0029] Next, another embodiment of the regulating member will be described. Figure 6 is an enlarged view of part A in Figure 1 showing an example in which a wire is used as the regulating member, and Figure 7 is an enlarged view of part A in Figure 1 showing an example in which a pin is used as the regulating member.

[0030] The wire 90, shown in Figure 6 as a regulating member, is a wire with one end fixed to the large-diameter expanding wing 3 and the other end fixed to the rotating rod 11 side of the drilling head 2. The length of the wire 90 is determined according to the desired enlarged drilling diameter. By attaching such a wire 90, the rotation range of the large-diameter expanding wing 3 can be set to any position between the minimum contraction position and the maximum expansion position of the large-diameter expanding wing 3. Therefore, by replacing the wire 90 with one of the length corresponding to the desired enlarged drilling diameter, the enlarged drilling diameter can be easily changed.

[0031] The restricting member shown in Figure 7 consists of a pin (not shown) that is detachably fixed to the pin holes 91A and 91B of the large-diameter expanding wing 3, and a groove 92 provided in the wing support portion 12. The groove 92 is formed in an arc shape centered on the support shaft 12A, and the pin fixed to the pin holes 91A and 91B is slidable within it. The pin holes 91A and 91B are positioned so that the rotation range of the large-diameter expanding wing 3 is restricted by the pin sliding within the groove 92 according to the desired expanded excavation diameter.

[0032] This allows the rotation range of the large-diameter expanding blade 3 to be set to any position between the minimum contraction position and the maximum expansion position of the large-diameter expanding blade 3 by changing the fixing position of the pin to either pin hole 91A or 91B. Therefore, the expanded drilling diameter can be easily changed by changing the fixing position of the pin to a position corresponding to the desired maximum drilling diameter.

[0033] It is also possible to provide pin holes 91A and 91B in the wing support portion 12 and groove 92 in the large-diameter enlarged wing 3. Furthermore, although this embodiment describes a configuration in which the restricting member is only on the large-diameter enlarged wing 3, it is also possible to have it only on the small-diameter enlarged wing 4, or on both the large-diameter enlarged wing 3 and the small-diameter enlarged wing 4. Moreover, it can be applied to other enlarged wings. [Industrial applicability]

[0034] The present invention is useful as a drilling device equipped with expanding wings, and is particularly suitable as a drilling device that can easily change the expanded drilling diameter. [Explanation of symbols]

[0035] 1 Lower element 2 drilling heads 3. Large diameter enlarged wings 4. Small diameter enlarged wings 6. Connection part 7, 8 keys 11 Rotating Rods 12,22 Wing support part 12A,22A spindle 13,23 Excavation claws 90 wire rod 91A, 91B pin holes

Claims

1. In a drilling device, the drilling head provided at the lower end of the auger is equipped with an expanding wing that rotates between an outwardly open expanded position and a contracted position that is more retracted than the expanded position, and when the auger rotates forward, the expanding wing is maintained in the contracted position, and when the auger rotates backward, the expanding wing rotates from the contracted position to the expanded position, An excavation device having a detachable restricting member that restricts the rotation range of the expanding wing at a position between the minimum retracted position and the maximum extended position of the expanding wing.

2. The drilling apparatus according to claim 1, wherein the restricting member is a key attached to the surface that contacts the expanding wing when it is in its maximum expanded position.

3. The drilling apparatus according to claim 1, wherein the restricting member is a wire whose one end is fixed to the expanding wing and whose other end is fixed to the rotating rod side of the drilling head.

4. The excavation apparatus according to claim 1, wherein the restricting member comprises a wing support portion that rotatably supports the expanding wing, a pin detachably fixed to one of the expanding wing and whose fixing position can be changed, and a groove provided on the other, through which the pin slides.

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