JPH0679895U - Drill pipe connecting device - Google Patents

Abstract

(57) [Abstract] [Purpose] The sliding resistance between the connecting member and the groove is reduced, and even if cement milk or the like adheres between the connecting member and the groove, the connecting member easily enters and leaves the groove. . [Structure] Involute spline 20 of male shaft 18,
The female shaft 14 of the additional drilling pipe 12 is inserted and the involute spline 16 of the female shaft 14 is fitted. And the cylindrical body 3
When 2 is moved downward, the spherical connecting block 28 is pushed by the cylindrical body 30 and locked in the groove 30 of the male shaft 18. Drilling pipe 1
When removing the two 12 from each other, after moving the tubular body 32 upward, the female shaft 14 is pulled out from the male shaft 18, and the spherical connecting block 28 is pushed by the groove 30 to retract from the groove 30. As described above, since the connecting member 28 for connecting the drill pipes 12 and 12 is formed in a spherical shape, the spherical connecting block 28 and the groove 30 are provided as compared with the conventional connecting device for a drill pipe in which the connecting member is formed in a piece shape. Sliding friction resistance is reduced, and even if cement milk or the like adheres between the spherical connecting block 28 and the groove 30, the spherical connecting block 28 easily moves in and out of the groove 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe connecting device, and more particularly to a pipe connecting device that sequentially connects pipes to advance underground.

[0002]

[Prior art]

 For boring work, etc., drill pipes of a certain length are sequentially connected and excavated in the ground. Conventionally, as a connecting device for this type of drilling pipe, there is one disclosed in Japanese Patent Laid-Open No. 5-33345. The pipe connecting device is provided with a male shaft having a male spline or a polygonal column formed at one end of the pipe and a groove formed around the male spline, and a female shaft provided at the other end of the pipe. A spline or polygonal groove is formed, and a female shaft having holes formed at a predetermined interval is provided on the circumference thereof, and the male shaft and the female shaft are fitted to each other, thereby transmitting the rotational force between the drill pipes. Connect as much as possible. A piece-shaped connecting member slidably mounted in each hole of the female shaft is pushed by the inner surface of the female body by moving the cylindrical body provided on the female shaft to engage with the groove of the male shaft. Then, the axial force between the drill pipes is maintained.

[0003]

[Problems to be solved by the device]

 However, in the conventional drill pipe connecting device disclosed in JP-A-5-33345, since the connecting member is formed in a piece shape, the sliding resistance between the connecting member and the groove is large, and this If cement milk or the like adheres between the connecting member and the groove, the connecting member cannot easily enter and leave the groove, and the drill pipes cannot be connected to each other.

The present invention has been made in view of such circumstances, and reduces the sliding resistance between the connecting member and the groove, and even when cement milk or the like adheres between the connecting member and the groove, An object of the present invention is to provide a drill pipe connecting device in which a connecting member can easily enter and leave a groove.

[0005]

[Means for solving the problem]

 In order to achieve the above-mentioned object, the present invention relates to a drill pipe connecting device for sequentially connecting unit drill pipes of a certain length to each other to rotate and feed the pipe, and to provide one end portion of the drill pipe. On the other hand, a male spline is formed and a groove is formed around it, and a female spline is formed on the other end of the above-mentioned digging pipe, and at a predetermined interval on its circumference. A female shaft having a hole formed therein, a spherical connecting member mounted in the hole of the female shaft and held slidably in the radial direction of the drill pipe, and provided on the outer peripheral portion of the female shaft. A tubular body slidably arranged in the axial direction of the drill pipe, and the splines of the male and female shafts are engaged with each other to fit the drill pipes together, and the tubular body is moved in one direction. Move the spherical connecting member toward the center of the digging pipe on the inner surface of the cylindrical body, and part of the spherical connecting member into the groove of the male shaft. Characterized by connecting the digging pipes together engaged.

[0006]

[Action]

 According to the present invention, first, a male shaft spline formed at one end of a drill pipe is fitted with a female shaft spline formed at the other end of the drill pipe on the side to be connected to separate the drill pipes from each other. Link. Next, when the cylinder provided on the female shaft is moved in the axial direction, the spherical connecting member mounted in the hole of the female shaft is pushed by the inner surface of the cylinder and slides toward the center of the digging pipe, A part of the spherical connecting member engages with a groove formed around the male shaft. This completes the connection between the pipes.

Further, when removing the drill pipes from each other, if the female shaft is pulled out from the male shaft after moving the tubular body to the initial position of the female shaft, a part of the spherical connecting member is a groove of the male shaft. It is pushed by the inclined surface of and slides in the direction of retracting from the groove. As a result, the connection between the pipes is released. Therefore, according to the present invention, since the connecting member between the drill pipes is formed into a spherical shape, the sliding friction between the connecting member and the groove is greater than that of the conventional connecting device for a drill pipe in which the connecting member is formed in a piece shape. The friction resistance becomes small, and even if cement milk or the like adheres between the spherical connecting member and the groove, the spherical connecting member can easily move in and out of the groove.

Further, according to the present invention, since it is not necessary to align the groove of the male shaft with the spherical connecting member, the spline can be fitted at any position having a large number of teeth.

[0009]

【Example】

 Hereinafter, a preferred embodiment of a pipe connecting device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a drill pipe connecting device 10 according to the present invention. The upper and lower drill pipes 12, 12 connected by the drill pipe connecting device 10 are formed to have a constant length, and a female shaft 14 as a connecting member is fixed to the lower end portion of the upper drill pipe 12 in the drawing. ing. The female shaft 14 is formed in a tubular shape and is disposed coaxially with the drilling pipe 12, and an inner peripheral portion 15 of the female shaft 14 is a multi-line spline having a relatively large number of teeth, such as the involute shown in FIG. The lute spline 16 is formed. As shown in FIG. 3, the involute spline 16 has chamfered taper surfaces 16B and 16B formed on both sides of the tips of the teeth 16A, 16A.

The involute spline 16 is formed on the axis of the digging pipe 12 shown in FIG. 1, and the involute spline 20 formed on the male shaft 18, which is a connecting member, is provided on the involute spline 16 via a packing 22. The spline is fitted as shown in FIG. As a result, the rotational torque of the drill pipe 12 on the upper side in the drawing is transmitted to the drill pipe 12 on the lower side in the drawing.

The male shaft 18 is fixedly disposed coaxially with the drill pipe 12 on the lower side in the drawing. Further, tapered surfaces are formed on both sides of the tip end portion of each tooth of the involute spline 20, similarly to the involute spline 16. In addition, the packing 22 is filled with the injection liquid such as cement milk or the like when it is excavated while ejecting the injection liquid such as cement milk from the tip of the bit 42 shown in FIG. It is provided to prevent this.

On the other hand, as shown in FIG. 1, an involute spline 24 is formed on the outer peripheral portion of the lower end of the female shaft 14, and circular holes 26, 26 ... Are formed in the lower part of the involute spline 24 in FIG. As shown, the openings are formed at 45 ° intervals. The hole 26 is formed in a taper shape toward the central axis 18a of the male shaft 18. Further, spherical connecting blocks 28, 28 ... Are mounted in the respective holes 26, 26 so as to be slidable in the radial direction of the female shaft 14.

An annular groove 30 is formed on the outer peripheral portion of the male shaft 18. The groove 30 is formed at a position corresponding to the spherical connecting blocks 28, 28, ... When the male shaft 18 is spline-fitted to the female shaft 14. A cylindrical body 32 is inserted into the outer circumference of the female shaft 14 as shown in FIG. 1, and the cylindrical body 32 is attached so as to be vertically movable in the axial direction of the digging pipe 12 as shown by an arrow in the figure. Further, an involute spline 34 is formed on the inner peripheral surface of the cylindrical body 32. The involute spline 34 is formed in the axial direction of the digging pipe 12 and is spline-fitted with the involute spline 24 of the female shaft 14. The involute splines 24 and 34 prevent the cylindrical body 32 from rotating with respect to the female shaft 14 due to the resistance of soil or the like, and prevent the packing from being damaged.

On the outer periphery of the female shaft 14, packings 36 and 39 as stoppers for the cylindrical body 32 and as a sealing material for preventing intrusion of muddy water are provided, whereby the cylindrical body 32 and the female shaft 14 are sealed. Held in a state. Further, since one end surface of the cylindrical body 32 is in close contact with the packings 35 and 38 provided on the male shaft 18, the cylindrical body 32 and the male shaft 18 are kept in a sealed state, and muddy water is connected from the outside. In addition to preventing friction from penetrating into the section, the packing 35 causes water pressure to act on the upper surface of the tubular body 32 against the digging pipe 12 and presses the tubular body 32 downward in FIG. It is also possible to prevent the tubular body 32 from coming off during excavation. Further, the packing 36 has a role of holding the tubular body 32 in a state where the tubular body 32 is moved upward in the drawing (FIG. 6) when the drill pipe 12 is attached and detached. As a result, when one of the drill pipes 12 is lifted, a part of the spherical connecting block 28 is pushed into the groove 30 of the male shaft 18 and enters the inner diameter storage portion 33 of the tubular body 32, so that the drill pipes 12, 12 are attached and detached to each other. Is possible.

The operation of the drill pipe connecting apparatus 10 configured as described above will be described. First, the power pipe swivel 40 of the base machine 38 shown in FIG. 5 is attached with the drill pipe 12 provided with the drill pipe connecting device 10, and a bit 42, which is a drilling blade, is provided at the tip of the drill pipe 12 so that the cement The ground is excavated while ejecting an injection liquid such as milk from the tip of the bit 42. An auger 44 is attached to the digging pipe 12. Next, the length of one digging pipe 12 is excavated, and then a new digging pipe 12 is connected by a digging pipe connecting device 10 to be added.

As shown in FIG. 6, the replenishment method is to hold the male shaft 18 by the holder 48 so that the drill pipe 12 (lower side in the drawing) used for excavation does not drop into the drill hole 46. It is fixed so that it is located above the excavation hole 46. Then, the digging pipe 12 to be added (upper side in the drawing) is inserted into the involute spline 20 of the male shaft 18, and the involute spline 16 of the female shaft 14 is spline-fitted. As a result, the lower digging pipe 12 in the figure is connected to the upper digging pipe 12 so that the rotational driving force can be transmitted. At this time, the chamfers on both ends of the teeth of the involute splines 16 and 20 are tapered as shown in FIG. 3, so that the female shaft 14 is guided to the male shaft 18 along the chamfering. Is inserted. Accordingly, the involute spline 16 can be easily inserted and fitted into the involute spline 20 without aligning the fitting portion.

After fitting the involute spline, a not-shown fork or the like is hooked on the groove 37 of the outer shape of the cylindrical body 32, and the cylindrical body 32 is moved downward from the position shown in FIG. 6 by this fork. When the cylindrical body 32 is moved downward, the inner peripheral tapered surface 32a of the cylindrical body 32 contacts the spherical connecting block 28, and the spherical connecting block 28 is pushed by the inner peripheral tapered surface 32a to move in the direction of the arrow in the figure, that is, the male part. The shaft 18 moves in the direction of the central axis 18a (shown in FIG. 4). When the connecting block 28 moves, the inner peripheral portion of the spherical connecting block 28 is locked in the groove 30 of the male shaft 18 as shown in FIG. As a result, the axial force between the digging pipes 12, 12 is maintained and the connection is completed.

On the other hand, when removing the digging pipes 12 from each other, the cylindrical body 32 is moved to a position shown by a solid line in FIG. 6 by a not-illustrated fork or the like, and then the female shaft 14 is moved to the male shaft 18. Pull out from. When the female shaft 18 is pulled out, the spherical connecting block 28 is pushed by the groove 30 and retracts from the groove 30. As a result, the connection between the drill pipes 12, 12 is released. As described above, in this embodiment, since the connecting member 28 for connecting the drill pipes 12 and 12 to each other is formed in a spherical shape, the connecting member 28 is connected in a spherical shape as compared with a conventional connecting device for a drill pipe in which the connecting member is formed in a piece shape. The sliding frictional resistance between the block 28 and the groove 30 is reduced, and even if cement milk or the like adheres between the spherical connecting block 28 and the groove 30, the spherical connecting block 28 can easily enter and leave the groove 30. can do.

Further, in this embodiment, since the groove 30 and the spherical connecting block 28 are not required to be aligned with each other, the involute splines 16 and 20 can be fitted at any position with a large number of teeth. As a result, in this embodiment, as compared with the conventional connecting device for a drill pipe in which a polygonal column is formed on the male shaft and a polygonal groove is formed on the female shaft to connect the drill pipes, the alignment position of the drill pipes is adjusted. Since it is unnecessary, the drill pipes can be connected easily and in a short time. Further, it is possible to similarly connect a plurality of parallel multiaxial drill pipes.

[0020]

[Effect of device]

 As described above, according to the drill pipe connecting device of the present invention, since the connecting member for connecting the drill pipes is formed in a spherical shape, the connecting device of the conventional drill pipe is formed in a piece shape. In comparison, the sliding frictional resistance between the connecting member and the groove is reduced, and even if cement milk or the like adheres between the spherical connecting member and the groove, the spherical connecting member can easily enter and leave the groove. You can

Further, according to the present invention, since it is not necessary to align the groove of the male shaft with the spherical connecting member, the spline can be fitted at any position with a large number of teeth.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a pipe connecting device according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view of a main part showing an example of chamfering a tapered tip of a female involute spline.

FIG. 4 is a sectional view taken along the line BB in FIG.

FIG. 5 is an explanatory view showing a state of excavating underground by using a drill pipe connected by a pipe connecting device according to the present invention.

FIG. 6 is a cross-sectional view showing an embodiment when attaching and detaching the connecting device for a drill pipe according to the present invention.

[Explanation of symbols]

 10 ... Drill pipe connecting device 12 ... Drill pipe 14 ... Female shaft 16 ... Female involute spline 18 ... Male shaft 20 ... Male involute spline 26 ... Hole 28 ... Spherical connecting block 30 ... Groove 32 ... Cylindrical body

Claims (1)

[Scope of utility model registration request] 1. A connecting device for a drilling pipe which sequentially connects unit drilling pipes of a fixed length to advance under the ground while applying rotation and feed, wherein a male spline is provided at one end of the drilling pipe. A male shaft that is formed and has grooves formed around it, and a female spline that is formed at the other end of the drill pipe and that has holes formed at predetermined intervals on its circumference. A shaft, a spherical connecting member mounted in the hole of the female shaft and held so as to be slidable in the radial direction of the drill pipe, and provided on the outer peripheral portion of the female shaft and sliding in the axial direction of the drill pipe And a pipe body that is arranged so that the splines of the male and female shafts are engaged with each other to fit the excavation pipes together, and the pipe body is moved in one direction so that the inner surface of the pipe body is The spherical connecting member is moved toward the center of the drill pipe, and a part of the spherical connecting member is engaged with the groove of the male shaft to connect the drill pipes to each other. Coupling device digging pipes, characterized in that.