JP4195876B2 - Drilling rig - Google Patents

Description

  The present invention relates to an excavator capable of penetrating and extracting a pipe from the ground.

  The present applicant lays various pipes such as a water collecting pipe for collecting groundwater, a drain pipe for infiltrating water into the ground, and a chemical injection pipe for recovering soil contamination by non-cutting and pushing only from the starting side. A pipe laying method suitable for this is proposed (Japanese Patent Application No. 2003-21111).

  This laying method has an inner pipe provided with a passage for drilling fluid, an inner tool that moves forward in the digging direction under impact and rotation by a drill head, and an outer tool that has an outer bit attached to the front end of the outer pipe in the digging direction This is based on double-pipe excavation in which the inner tool is abutted against the outer tool and the ground is propelled by one-push propulsion with impact. When propelled to a predetermined position on the ground by such double pipe excavation, the inner tool is extracted and replaced with a laying pipe. And the pipe | tube for laying is laid in the ground by removing an outer tool from the ground.

  By the way, in the inner tool used in this laying method, the inner pipe is constituted by connecting a plurality of pipes to each other with a left screw. Therefore, the rear end portion of the inner tool is connected to the rod sub of the swivel connected to the hammer sub of the drill head that generates a rotational force and a striking force with a left screw. Therefore, when excavating the ground, it is driven by left rotation, which is the direction in which the left screw is tightened.

  On the other hand, the outer tool is configured such that an outer tube connects a plurality of tubes to each other with a right screw. Therefore, when the outer tool is removed from the ground while leaving the laying pipe on the ground, there is a problem that the rear end of the outer tool is a right-hand thread connection, so that it cannot be connected to the left-threaded rod sub. Since the outer tool receives the earth pressure of the ground over its longitudinal direction, it can be removed smoothly from the ground if the rotational force of the drill head can be applied. From the viewpoint of shortening the construction time, It is necessary to apply a rotational force so that the outer tool can be removed.

  As a solution to the discrepancy between the right and left screw types, a swivel with a right-threaded rod sub or a drill head with a right-threaded hammer sub is prepared separately for outer tool tube extraction. It is possible to replace it with the one with the left-hand thread connection used at the excavation site. However, since this requires a plurality of drill heads and swivels for one construction, there is a problem that the construction cost increases. In addition, it is actually difficult to disassemble the swivel or drill head at the excavation site and replace it with a rod sub or hammer sub with a right-hand thread connection, and this cannot be a practically effective solution.

  The present invention has been made against the background of the prior art as described above, and an object of the present invention is to provide a drilling device capable of connecting pipes having mismatched screw types on the left and right.

  In order to achieve the above object, the present invention relates to a drilling device in which a connecting pipe in which a plurality of pipes are screw-connected is screw-connected to a rotation transmission shaft, and the connecting pipe can be rotated and penetrated into and extracted from the ground. A rotation transmission shaft is provided with a right-hand thread coupling portion for connecting a connection pipe in which a plurality of pipes are connected with a right-hand thread, and a left-hand thread connection portion for connecting a connection pipe in which a plurality of pipes are connected with a left-hand screw. It is possible to penetrate and withdraw from the ground while rotating the connecting tube in a rotation direction that matches the screwing direction of the left and right thread types of the connecting tube connected to any of the connecting portions of the shaft. The drilling rig is provided.

  According to this excavator, the rotation transmission shaft is provided with a right-screw coupling portion and a left-screw coupling portion, and the rotation direction matches the screwing direction of the left and right thread types of the coupling pipe connected to any of the coupling portions. Then, while rotating the connecting pipe, it can be penetrated into and extracted from the ground. For this reason, beyond the mismatch between the left and right thread types, the connecting pipe to be connected can be connected with either a right-handed screw connection or a left-handed screw connection. Also, there is no need to replace the rotation transmission shaft at the excavation site.

  As described above, the excavator of the present invention is characterized in that the mismatch between the right and left screw types for each connecting pipe can be eliminated. For this reason, as a specific example of a drilling device, it can be configured as any of a drill head, a swivel, both a drill head and a swivel, and can be applied regardless of the type of drill head or swivel. Therefore, the specific form of the rotation transmission shaft is also configured in accordance with the drill head, swivel or the like configured as the excavator of the present invention. Further, the drill head can be applied to any one that applies only the rotational force to the connecting pipe, or that applies the rotational force and the striking force to the connecting pipe.

  In the excavator, the rotation transmission shaft can be constituted by two rotating shafts, a cylindrical rotating shaft on the outer peripheral side and an inner rotating shaft on the inner peripheral side. In this case, the inner rotation shaft can be configured as a length that protrudes in the axial direction from the cylindrical rotation shaft, or can be configured as a length that does not protrude in the axial direction from the cylindrical rotation shaft. In the latter case, the inner peripheral surface of the cylindrical rotating shaft is further provided with a support surface that supports the outer peripheral surface of any one of the connecting pipes connected to the inner peripheral rotating shaft. Is done. According to this, since the connecting pipe rotated by the inner peripheral side rotating shaft is supported by the support surface of the cylindrical rotating shaft, the connecting pipe can be rotated stably.

  The connecting pipe connectable to the excavator of the present invention as described above can be applied regardless of the difference in use such as a drill rod and a casing pipe, except that it is a right-handed screw connection or a left-handed screw connection. That is, if the excavator of the present invention is applied to the above-described conventional example, an inner tool connected with a left-hand thread can be connected during excavation, and an outer tool connected with a right-hand screw can be connected when the outer tool is extracted. However, the use of the drilling device of the present invention is not limited to this. For example, a small-diameter drilling tool is connected to the left-screw coupling portion, and a large-diameter drilling tool is connected to the right-screw coupling portion. Thus, it can also be used for connecting pipes of the same application.

  According to the drilling device of the present invention, it is possible to expand the types of pipes that can be connected by one unit regardless of the type of right-handed screw or left-handed screw, so that there is no need for a right-handed screw connection or left-handed screw drilling device There is no need to replace the rotation transmission shaft at the excavation site. Therefore, construction time can be shortened and construction cost can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, an application example to the same pipe laying method as the above-described conventional example will be described. That is, based on single-pushing double pipe excavation using an inner tool in which a plurality of pipes are connected to each other with a left screw and an outer tool in which a plurality of pipes are connected to each other with a right screw, a predetermined position on the ground It is a method of laying the pipe for laying on the ground by extracting the inner tool, replacing it with the pipe for laying, and removing it from the ground while rotating the outer tool. .

  FIG. 1 is a diagram showing a use state during ground excavation, and an excavation apparatus 1 according to this embodiment includes a drill head 2 that is a rotary percussion drill, and a swivel 3. In addition, although illustration is abbreviate | omitted, the drill head 2 is being fixed to the base which moves along the guide cell of the propulsion apparatus which gives a thrust to the drill head 2. FIG.

  A hammer sub 4 serving as a “rotation transmission shaft” protruding from the front end of the drill head 2 is a transmission portion for rotational force and striking force by the drill head 2, and includes a large diameter portion 4 a and a small diameter portion 4 b. A left screw coupling portion 4c is formed on the outer circumferential surface of the large diameter portion 4a, and a right screw coupling portion 4d is formed on the outer circumferential surface of the small diameter portion 4b.

  The swivel 3 is roughly composed of a rod sub 5 as a “rotation transmission shaft”, a swivel case 6, a retainer 7, and a rear end cover 8. On the rear end side of the rod sub 5, a left screw connection portion 5 a that is rotationally engaged with the left screw connection portion 4 c of the hammer sub 4 is formed. A cylindrical portion 5 b is formed on the front end side of the rod sub 5. A left screw connecting portion 5c is formed on the inner peripheral surface of the cylindrical portion 5b. A through hole 5d is formed in the partition wall that separates the front end side and the rear end side of the rod sub 5 and the small diameter portion 4b of the hammer sub 4 protrudes into the cylindrical portion 5b through the through hole 5d. The swivel case 6 is provided with a drilling fluid supply port 6a, and the drilling fluid flows to the cylindrical portion 5b of the rod sub 5 through the annular passage 6b. The drilling fluid thus flowing into the cylindrical portion 5 b is supplied to the inner tool 10 connected to the tip of the drilling fluid through the inside of the master coupling 9. In addition to the above, 11 is a grease nipple and 12 is a cushion rubber.

  The rear end portion of the inner tool 10 is connected to the front end portion of the master coupling 9 by left-hand screw connection. A left screw connecting portion 9a is formed at the rear end portion of the master coupling 9, and is connected to the left screw connecting portion 5c of the rod sub 5 by screwing.

  As described above, in the excavator 1 in which the inner tool 10 is connected by the left screw connection via the master coupling 9, the counterclockwise rotational force provided by the drill head 2 is controlled by the hammer sub 4 and the rod sub 5. 9 and the inner tool 10. As a result, the inner tool 10 can be rotated and excavated without loosening the left-hand screw connection at various places. Moreover, the impact excavation by the inner tool 10 is possible by transmitting the impact force along the same route.

  Next, FIG. 2 shows that when the rotary tool excavation by the inner tool 10 is finished, the inner tool 10 is pulled back and extracted, replaced with a laying tube, and then the outer tool 11 is extracted from the ground. It is in use. At this time, the master coupling 9 is removed and the rod sub 12 is used. The rear end portion of the outer tool 11 is coupled to the front end portion of the rod sub 12 with a right-hand thread connection. A right screw coupling portion 12a is formed at the rear end portion of the rod sub 12 and is opposed to the right screw coupling portion 4d of the small diameter portion 4b of the hammer sub 4 protruding into the cylindrical portion 5b of the rod sub 5 described above. They are connected by screwing.

  As described above, in the excavator 1 in which the outer tool 11 is connected by the right screw connection via the rod sub 12, the rotational force of the right rotation provided by the drill head 2 is applied to the rod sub 12 and the outer tool 11 by the hammer sub 4. It is done. As a result, the outer tool 11 can be smoothly pulled out from the ground while rotating, even if the outer tool 11 is subjected to a large earth pressure without loosening the right-hand screw connection at various places. Further, at this time, since the outer peripheral surface of the rod sub 12 is supported while being partially in contact with the inner peripheral surface of the front end side of the rod sub 5, the rod sub 12 can be stably rotated.

  Next, a modification of the excavator 1 according to the above embodiment will be described.

  In the above embodiment, the master coupling 9 of the inner tool 10 is connected to the rod sub 5 and the rod sub 12 of the outer tool 11 is connected to the hammer sub 4. However, a right-screw connecting portion is connected to the rod sub 5 and the hammer sub 4 A left-handed thread connecting portion may be formed on the head and the connection may be reversed.

  In the above embodiment, an example in which the master coupling 9 and the rod sub 12 are used as adapter rods has been described. However, the inner tool 10 and the outer tool 11 may be directly connected.

  In the above embodiment, the “connecting pipe” composed of the inner tool 10 and the master coupling 9 and the “connecting pipe” composed of the outer tool 11 and the rod sub 12 are exemplified, but these may be changed according to the method to be implemented. it can.

  In the above embodiment, both the right screw connecting portion 4d and the left screw connecting portion 5c are male screws, but may be female screws.

  In the above-described embodiment, the small diameter portion 4b of the hammer sub 4 is positioned inside the cylindrical portion 5b of the rod sub 5, but it may be formed longer in the axial direction than the cylindrical portion 5b. You may form in the length used as the same position as the front-end position of the part 5b.

  In the above embodiment, the right screw connecting portion 4d is formed on the small diameter portion 4b of the hammer sub 4. However, a protrusion similar to the small diameter portion 4b may be provided on the rod sub 5, and the right screw connecting portion may be formed there. .

  In the above embodiment, an example in which the “drilling device” is configured with the drill head 2 as a rotary percussion drill and the swivel 3 as a water swivel is shown, but other types of drill heads and swivels may be used.

Sectional drawing which shows one use condition of the excavation apparatus by one Embodiment. Sectional drawing which shows the other use condition of the excavation apparatus by one Embodiment.

Explanation of symbols

1 Drilling Device 2 Drill Head 3 Swivel 4 Hammer Sub (Rotation Transmission Shaft)
4a Large diameter part 4b Small diameter part 4c Left screw connection part 4d Right screw connection part 5 Rod sub (rotation transmission shaft)
5a Left-hand thread connecting portion 5b Cylindrical portion 5c Left-hand thread connecting portion 5d Through hole 6 Swivel case 6a Supply port 6b Annular passage 7 Retainer 8 Rear end cover 9 Master coupling (connecting pipe)
9a Left-hand thread connecting part 10 Inner tool (connecting pipe)
11 Outer tool (connecting pipe)
12 Rod sub (connecting pipe)
12a Right-hand thread connection

Claims (2)

In a drilling device that allows a connecting pipe, in which a plurality of pipes are screwed, to be connected to a rotation transmission shaft by a screw, and allows the pipe to penetrate and withdraw while rotating the connecting pipe,
A rotation transmission shaft is provided with a right-hand thread coupling portion for connecting a connection pipe in which a plurality of pipes are connected with a right-hand thread, and a left-hand thread connection portion for connecting a connection pipe in which a plurality of pipes are connected with a left-hand screw. It is possible to penetrate and withdraw from the ground while rotating the connecting tube in a rotation direction that matches the screwing direction of the left and right thread types of the connecting tube connected to any of the connecting portions of the shaft. And drilling rig.   The rotation transmission shaft is composed of a cylindrical rotary shaft on the outer peripheral side and an inner rotary shaft that does not protrude in the axial direction from the cylindrical rotary shaft on the inner peripheral side, and the inner peripheral surface of the cylindrical rotary shaft rotates on the inner peripheral side. The excavator according to claim 1, further comprising a support surface that supports an outer peripheral surface of any one of the connecting pipes that is connected to a shaft and rotates.

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