JP2002194991A - Pipe unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe unit, in which the fitting strength between a resin pipe and a coupling device is high. SOLUTION: To the ends 21S of the resin pipe 21, a pipe-shaped coupling device 22 and 23 is fitted, respectively, for connecting pipes each other in line. On the pipe fitting side end of the coupling device 22 and 23, a double-structured part DB is provided, which comprises an inner pipe 24 having an external thread part 24a on the outer periphery and on outer pipe 25 having an internal thread part 25a on the inner periphery, the internal thread part having a screw direction reverse to that of the external thread part 24a. The end 21S of the resin pipe 21 is sandwiched between the external thread part 24a on the outer periphery of the inner pipe 24 and the internal thread part 25a on the inner periphery of the outer pipe 25, so that the coupling devices 22, 23 are fitted to the resin pipe 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pipe or drainage pipe for draining water in the ground, or an underground pipe for sewage, tap water, gas, various cables, etc., which is not cut and cut. The present invention relates to a pipe device suitable for being built in the ground.

[0002]

2. Description of the Related Art In recent years, a drilling method for appropriately controlling a drilling direction (hereinafter, also referred to as a direction control drilling) is used to place a bendable resin pipe under the ground while avoiding an existing underground structure or the like. The construction method to build in has been developed and attracted attention.

[0003] In this type of construction method, a large number of resin pipes each having a unit length fixed with a joint device at both ends are used, and if necessary, the resin pipes are connected in series by a joint device as needed. Inserted and built inside.

[0004]

However, in the conventional example, there is a problem that the attachment strength of the joint device to the resin pipe portion is low even though the coupling strength between the joint devices is high.

In particular, as described above, when the connecting pipes are inserted into the ground and built while appropriately connecting the resin pipes in series with a joint device as appropriate, the connecting pipes are inserted while being subjected to peripheral friction. However, if the mounting strength of the joint device is low, there is a problem that it becomes a neck and the underground insertion length cannot be extended as desired.

Accordingly, a main object of the present invention is to provide a pipe device having a high mounting strength between a resin pipe portion and a joint device.

[0007]

SUMMARY OF THE INVENTION The present invention, which has solved the above-mentioned problems, is a pipe apparatus in which a tubular joint device for connecting pipes in series is attached to an end of a resin pipe section. At the end on the mounting side, a double structure portion comprising an inner tube portion having a male screw portion on the outer peripheral surface and an outer tube portion having a female screw portion on the inner peripheral surface opposite to the tightening direction with the male screw portion is provided. A joint device is attached to the resin pipe portion by sandwiching an end of the resin pipe portion in a gap between a male screw portion on the outer peripheral surface of the inner pipe portion and a female screw portion on the inner peripheral surface of the outer pipe portion. It is a tube device.

[0008] In the present invention, there is provided a double structure comprising an inner tube portion having an external thread portion on the outer peripheral surface and an outer tube portion having an internal thread portion on the inner peripheral surface having a tightening direction opposite to that of the external thread portion. Since the end of the resin tube is sandwiched and fixed, not only are the threads of these threads cut into the resin tube and fixed, but even if the resin tube rotates in either the forward or reverse In the screwing relationship with either the outer tube portion or the outer tube portion, the resin tube portion and the joint portion do not substantially come off due to the rotation in the tightening direction.

In the present invention, a female screw portion to be screwed with a male screw portion on an outer peripheral surface of the inner pipe portion of the joint device may be formed on an inner surface of an end portion of the resin pipe portion, or an end portion of the resin pipe portion may be formed. On the outside,
It is also possible to form a male screw part which is screwed with a female screw part on the inner peripheral surface of the outer tube part of the joint device.

In particular, if the end of the inner tube is formed so as to protrude beyond the end of the outer tube, even if the resin tube is bent, the end holding portion will not bend at all. Clamping and fixing between the inner pipe portion and the outer pipe portion of the joint device is not easily released.

As will be understood from the embodiments described later, the present invention is inserted into the ground while resisting friction with the surroundings and receiving a rotational force around the axis or maintaining a state where there is a possibility of such rotation. It is suitable for use as an object. However, it can be used for other applications.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an example of use as an underground pipe. <Example of Pipe Building Apparatus> FIG. 1 shows a construction state of a pipe building apparatus example 1. The pipe-building device 1 includes a bendable resin outer pipe 2 to be built in the ground, a ring bit 3 coaxially attached to a tip of the outer pipe 2, and an outer pipe 2.
A steel inner pipe 5 that extends through the inner hole and the through-hole of the ring bit 3 and extends forward from the ring bit 3 and is harder to bend than the outer pipe 2 but is bendable. And a rotary propulsion device 7 that supports the inner tube 5 and the outer tube 2 and that rotates and propels the inner tube 5.

(Structure of the rotary propulsion device) The rotary propulsion device 7
For example, as shown in the figure, a reader 7L supported by a base machine 7B so as to be tiltable, and a rotary drive source 7M such as a hydraulic motor attached to the reader 7L so as to be vertically movable by hydraulic pressure. And can be mainly composed of The inner tube 5 is coaxially connected to the rotation axis of the rotary drive source 7M during propulsion, and the outer tube 2 is passed around the outside of the inner tube 5 but is not connected to the rotary drive source 7M but is merely a leader. It is only supported along 7L.

(Structure of Outer Tube) The outer tube 2 is formed by connecting a plurality of unit outer tubes 20 in series according to, for example, the insertion depth. As the unit outer tube 20, the tube device of the present invention can be suitably used. A specific example of this unit outer tube is shown in FIG. The unit outer tube 2 shown is a resin tube portion 21 occupying substantially the entire length in the longitudinal direction.
Is formed of a resin such as polyethylene, and a coupling device 22 having a female screw portion 22a at one end of the resin pipe portion and a male screw portion 23a at the other end.
Can be used. However, in the present embodiment, the one with the ring bit holder 26 (also corresponding to the joint device of the present invention) attached to the tip as shown in FIG. These joint devices 22 and 23 are formed of a highly rigid material such as steel. As a specific example of the resin pipe portion, for example, Hishi pipe HPPE (high performance polyethylene) manufactured by Mitsubishi Plastics, Inc. can be suitably used.

According to the present invention, the coupling devices 22, 2
3, the inner tube portion 24 having an external thread portion 24a on the outer peripheral surface thereof and having an outer diameter equal to or slightly smaller than the inner diameter of the resin tube portion 21 and the external thread portion 24a of the inner tube portion 24. A double structure portion DB having an internal thread portion 25a having an opposite tightening direction on the inner peripheral surface and having an inner diameter equal to or slightly larger than the outer diameter of the resin tube portion is provided. The joint devices 22 and 23 are attached to the resin pipe portion 21 by sandwiching 21S in a gap between the male screw portion 24a on the outer circumferential surface of the inner pipe portion 24 and the female screw portion 25a on the inner circumferential surface of the outer pipe portion 25. In this case, on the inner surface of the end portion 21S of the resin pipe portion,
A female screw portion to be screwed with the male screw portion 24a on the outer peripheral surface of the inner pipe portion of the joint device 22, 23 is formed, or the female portion of the inner peripheral surface of the outer pipe portion of the joint device is formed on the outer surface of the end portion 21S of the resin pipe portion. Screw part 25
Although it is desirable to form a male screw portion to be screwed with a,
Even if it is not formed, the material of the resin pipe portion 21 is the joint device 2
When the male and female screw portions 24a and 25a are somewhat softer than the male and female screw portions 24a and 25a, the screw threads of the screw portions 24a and 25a bite into the resin tube portion 21 when being clamped and fixed.

In particular, it is desirable that the joint devices 22 and 23 are formed so that the tip of the inner tube portion 24 projects more than the tip of the outer tube portion 25 as shown in the figure. With this configuration,
Even if the resin pipe portion 21 is bent, the end holding portion 21
Since S does not bend at all, it is difficult for the pinching and fixing between the inner tube portion 24 and the outer tube portion 25 of the joint devices 22 and 23 to come off.

In the unit outer tube 20, for example, the outer tube portion 25 of the joint device is formed slightly larger and formed separately, and after the resin tube portion 21 is connected to the outer periphery of the inner tube portion 24, the resin tube portion is formed. After sliding the outer tube portion 25 arranged before or after outside of the outer tube portion and positioning the end portion 21S of the resin tube portion in the gap between the outer tube portion 25 and the inner tube portion 24, the outer tube portion 25 is It is compressed and fixed to the gap between the outer tube portion 25 and the inner tube portion 24 with the end portion of the resin tube portion sandwiched therebetween, and the thread of the female screw portion on the inner peripheral surface of the outer tube portion is cut into or screwed into the outer surface of the resin tube portion. Then, it can be manufactured by fixing the outer tube portion 25 to the main body of the joint device 23 by welding W or the like.

In this embodiment, the ring bit 3 is coaxially cut at the tip of the outer tube 2, that is, the tip of the outermost unit outer tube 20 via a ring bit holder 26 as shown in FIG. It can be freely rotated only in the hole rotation direction. The ring bit holder 26 has a tubular shape as a whole as shown in an exploded state in FIG. 4, and has a double structure DB for clamping and fixing at the base end similar to the coupling device at the end of the unit outer tube. Then, a ring-shaped holder clutch 27 having the same outer diameter is coaxially fixed to the end by welding W or the like.
Inner diameter enlarged portion 26 whose inner diameter is partially enlarged on the base end side of 7
D. On the other hand, as shown in FIGS. 8 to 10 in addition to FIG.
A ring-shaped bit clutch 32 that engages with the holder clutch 27 is fixed to the distal end of the small-diameter tube shaft portion 30 by welding or the like. Is provided with an outer diameter enlarged portion 33.

In this embodiment, the outer diameter enlarged portion 33 at the base end of the small diameter pipe shaft portion 30 of the ring bit 3 is attached to the bit holder 26.
The ring bit 3 is rotatably supported by the bit holder 26 by being accommodated in the inner diameter enlarged portion 26D of
In addition, it is connected to the bit holder 26 in the front-rear direction with a play corresponding to the step height of the clutch described later. The holder clutch 27 and the bit clutch 32 are provided on one side plane as shown in FIGS.
7A... 32A... Are formed in a substantially similar shape having a plurality of circumferential portions, and in the state of attachment to the bit holder 26 and the ring bit 3, respectively, as shown in FIG. Are mounted so as to face each other, and when used, these step forming surfaces are in contact with each other as shown in FIG. In particular, each step 27A of the holder clutch 27 and the bit clutch 32
, 32A ... When the bit clutch 32 is rotated in the drilling rotation direction, the stepped portion 3 of the bit clutch 32
Are rotated while moving back and forth by the step height without being caught by the step portions 27A of the holder clutch 27, and are caught when rotated in the direction opposite to the drilling rotation direction so as not to rotate any more. .

On the other hand, the outer diameter of the large-diameter portion 31 of the ring bit 3 is slightly larger than the outer diameter of the outer tube 2.
As shown in FIG. 10, a large number of bits 3a, 3a... Are provided in the front surface of the large-diameter portion 31 in the circumferential direction. Are formed in the circumferential direction (six in the illustrated example). This groove 30
The functions of D, 30D,... Will be described later.

(Structure of the inner tube) On the other hand, the inner tube 5 of the present apparatus example
Can be formed by connecting a plurality of unit inner tubes 50 in series according to the insertion depth, for example. As shown in FIG. 11, the unit inner tube 50 is formed of a material that is harder to bend (higher rigidity) than the outer tube 2 but is bendable, for example, a steel tube or the like. And a male screw portion 52 formed at the other end can be used. However, as shown in FIG. 3, if the leading portion 50F of the inner tube 5 protruding forward from the ring bit is easily bent, the accuracy at the time of straight-line propulsion to be described later is reduced. It is desirable to make the rigidity higher and make it harder to bend. In particular, the leading portion 50
It is preferable that the boundary between F and the base end portion be located just near the front end of the ring bit 3 because a dedicated unit pipe made of a more rigid material can be prepared as the unit pipe 50F of the leading part. .

By the way, if the rigidity including the outer tube 2 is shown, the following equation (1) is obtained. Inner tube leading portion> Inner tube proximal end portion> Outer tube (1) As described above, unless the outer tube 2 is more easily bent than the inner tube 5, it is very difficult to smoothly and sharply propell a curve at a steep angle. ,
In addition, if the leading portion 50F protruding from the ring bit 3 in the inner tube 5 is not made more difficult to bend than the base end portion, the straightness during propulsion is reduced.

In this embodiment, the portion corresponding to the ring bit 3 in the inner tube 5 is constituted by a substantially cylindrical bit device 55 having a configuration corresponding to an engagement portion with the ring bit 3. The bit device 55 has an outer diameter enough to be fitted inside the ring bit 3 as shown in FIGS. 12 and 13 in addition to FIG. 3, and has a distal end portion and a proximal end portion connected to the unit inner pipe. And a groove 30D on the inner peripheral surface of the ring bit 3 on the outer peripheral surface thereof.
.. Are provided along the longitudinal direction at portions corresponding to.
.. Are formed (three in the illustrated example).
When the inner tube 5 is advanced, the convex streaks 55C of the bit device 55 are inserted up to the front end limit in the corresponding ring bit groove portion 30D, and are not inserted any more. And the inner pipe 5 advances while pulling the ring bit 3 and the outer pipe 2 connected thereto. When the inner pipe 5 is rotated in this state, the rotational force of the inner pipe 5 is transmitted to the ring bit 3 by the circumferential engagement of the convex streak 55C and the groove 30D, whereby the ring bit 3 It is to be rotated with respect to. On the other hand, when the inner tube 5 is retracted with respect to the outer tube 2,
Is detached from the groove 30D on the inner surface of the ring bit 3, and when the bit device 55 is further retracted, the bit device 55 is detached behind the ring bit holder 26, and the outer tube 2 at the rear is removed.
It is designed to retreat inside. In addition, this convex streak portion 5
In order to facilitate the insertion of 5C, it is preferable that the number thereof is smaller than that of the groove, specifically, about half.

On the other hand, in this embodiment, a tapered bit 6 having a pressure receiving surface inclined with respect to the axial direction is attached to the tip of the inner tube 5 via a bit reducer 56 (which also constitutes the inner tube 5). I have. As shown in FIG. 3 and FIG. 14, the bit reducer 56 has a male screw portion 56A at the base end thereof as a connecting means.
Is screwed to the female screw part 51 at the tip of the head. At the tip of the bit reducer 56, a male screw portion 56B for connecting a taper bit is provided.

The tapered bit 6 has a shape in which the head of the columnar body is cut obliquely with respect to the axial direction to form an inclined surface 60, as shown in FIGS. , The outer diameter of which is slightly larger than that of the ring bit 3, and a plurality of ridges 61, 61... Those buried so that 62 and 62 are respectively exposed on the front end surface can be used. Such a taper bit 6
Because of its simple structure, it can be manufactured at low cost by using casting or the like, and even if it is buried in the ground as described later, the execution cost does not increase significantly.

Particularly, in this example, as shown in FIG.
The base end face of the tapered bit 6 has an internal thread 6 along the axis.
The tapered bit 6 is attached to the tip of the inner tube 5 by screwing the male screw portion 56B of the bit reducer 56 to the female screw portion 63. In this example, a flow path 64 communicating from the inside of the female screw portion 63 to the inclined surface 60 is formed. Further, in this example, the ring bit 3
A plurality of engaging projections 65 are provided in the circumferential direction to engage with the bits 3a on the front surface in the circumferential direction. The engagement convex portion 65 is for removing the tapered bit 6 from the distal end of the inner tube 5. Details of this removal will be described later.

<Example of Pipe Building Method> Next, an example of a pipe building method using the above-described apparatus will be described. First,
Preferably, as shown in FIG. 19, a guide tube 100 having a length at least as long as the length of the inner tube leading portion 50F is inserted into the insertion portion of the ground G. Then, although not shown, the inner pipe leading portion 50F is connected to the rotation drive shaft of the rotary propulsion device 7, and the inner pipe portion 50F is inserted by rotary propulsion or propulsion only. This propulsion is performed by lowering the rotation drive source of the rotary propulsion device 7. At this time, the inner pipe 5 and the taper bit 6
It is desirable to propel while supplying a drilling stabilizing liquid such as muddy water to the tip through the flow path 64 of the above. The guide tube 100
Although it is possible to omit the installation, it is preferable to use the guide tube 100 as in the illustrated example because the propulsion direction is easily shifted since the propulsion is performed only by the inner tube 5 at first.

Next, although not shown, the unit inner tube 50 having the bit device 55 attached to the tip is connected to the ring bit 3.
Is inserted into the outer tube 2 to which is attached, and the tip of the bit device 55 projecting from the tip of the ring bit 3 is added to the base end of the inner tube leading portion 50F that has been propelled earlier (see FIG. 3). Thereafter, the base end of the unit inner pipe 50 thus added is connected to a rotary drive source.

Thereafter, both the inner pipe 5 and the outer pipe 2 are further propelled underground as shown in FIG. 20 while sequentially adding the unit inner pipe 50 and the unit outer pipe 20 respectively. In the device of this example, the direction can be controlled during propulsion.

More specifically, when linear propulsion is performed, as shown in FIG. 22, a rotary propulsion device 7 applies a rotational force and a propulsive force to the inner pipe 5, and a hole is drilled by the tapered bit 6 at the tip of the inner pipe 5. The inner pipe 5 is linearly propelled into the ground. In this case, although the tip of the tapered bit 6 has the inclined surface 60, it advances while rotating around the axis, so that the influence of the pressure received by the inclined surface 60 is negated, and the hole can be drilled linearly. . Also, at this time, the rotational force and the propulsive force of the inner tube 5 are given to the ring bit 3 by the engagement between the ridge portion 55C of the bit device 55 constituting the inner tube 5 and the groove portion 30D of the ring bit (see FIG. 3). As described above, the ring bit 3 is the bit holder 2
6 is rotatably supported at the tip of the outer tube 2 and each step 3 of the bit clutch 32 and the holder clutch 27.
When the bit clutch 32a is rotated in the drilling rotation direction, the ring bit 32a is not caught when the bit clutch 32a is rotated, and the rotation of the ring bit 32 is permitted. The outer tube 2 is not rotated, and only the ring bit 3 is rotated. Further, since the ring bit 3 is connected to the tip of the outer tube 2 in the front-rear direction, the propulsion force applied to the ring bit 3 by the inner tube 5
Is pulled and pulled.

On the other hand, when performing curved propulsion, as shown in FIG. 23, the rotation of the inner pipe 5 is performed in a state where the tip of the inclined surface 60 of the tapered bit 6 is located on the side to be bent with respect to the rotation axis. The rotation is stopped, and only the propulsion is applied to the inner pipe 5 by the rotary propulsion device. At this time, a force applied to the pressure receiving surface 60 of the taper bit 6
Is gradually changed, and the inner pipe 5 can be propelled curvedly underground. At this time, the propulsion force of the inner pipe 5 is given to the ring bit 3 by the engagement between the ridge 55C of the bit device 55 constituting the inner pipe 5 and the groove 30D on the inner peripheral surface of the ring bit. Since the ring bit 3 is connected to the distal end of the outer pipe in the front-rear direction, the outer pipe 2 is propelled in a curved manner so that the outer pipe 2 is pulled by the propulsive force applied to the ring bit 3 by the inner pipe 5.

Then, at least one of these propulsions is performed, and the outer tube 5 is moved to a predetermined depth along a desired route (a straight route or a meandering route such as an S-shape). After propulsion, in this example, the tapered bit 6 is removed from the tip of the inner tube as shown in FIG. Specifically, as shown in FIG. 24, first, the inner pipe 5 is retracted with respect to the outer pipe 2, and the engagement protrusion 6 on the base end face of the taper bit 6 is formed.
Are inserted between the bits 3a on the front of the ring bit 3. Thereafter, in this state, when a rotational force is applied to the inner pipe 5 in a direction opposite to that at the time of drilling (the direction indicated by the arrow in the figure),
Rotational force is applied to the taper bit 6 in the direction opposite to the direction of drilling, and the engaging projections 65, 65 are hooked on the bit 3 a of the ring bit, and the ring bit 3 also rotates in the direction opposite to the direction of drilling. Is transmitted, but at this time, the step portion 32A of the bit clutch 32 of the ring bit 3 is transmitted.
Outer pipe 2 constrained by the surrounding ground to prevent rotation
Since the tapered bit 6 is caught by the step portion 27A of the holder clutch 27 at the tip, the tapered bit 6 cannot be rotated almost in the opposite direction. When the inner pipe 5 is rotated in the opposite direction to the drilling in a state where the taper bit 6 does not rotate, the taper bit 6 rotates in the drilling direction relative to the inner pipe 5, The screw engagement between the tapered bit 6 and the bit reducer 56 at the tip of the inner tube 5 is released, and the tapered bit 6 can be detached from the tip of the inner tube 5.

After removing the taper bit 6,
With the tapered bit 6 left in front of the outer tube 2 and the outer tube 2 inserted into the ground as it is, the inner tube 5 is pulled out of the outer tube by the rotary propulsion device 7. Thus, the outer pipe 2 can be built underground. In this case, the tapered bit 6 may be buried and buried in the ground as it is, or a shaft may be dug before or after the bit is removed, and the removed tapered bit 6 may be collected.

Although not shown, it is also possible to carry out the process so as to penetrate from the ground portion on one side or a previously provided shaft through the construction area to the ground portion on the other side or the previously provided shaft as in the conventional example. . In this case, after removing and collecting the bit, the inner tube can be pulled out.

On the other hand, the outer pipe 2 built in the ground as described above is left in the ground G as it is, and a collecting pipe or a drain pipe for draining water in the ground G, or a sewage or tap water. , Gas, various cables and the like.

<Others> (A) In the present invention, the unit outer tube 20 and the unit inner tube 50
As the mutual coupling device, a known connection structure can be applied other than the screw connection structure as in the above example.

(B) In the above installation example, not only the tapered bit 6 in the illustrated example, but also, for example, a bent-axis tapered bit or an arc-shaped tapered bit, the peripheral surface thereof is inclined with respect to the axial direction. It can be used because it forms a pressure receiving surface.

(C) In the above example, the ridges 55C may be directly provided at predetermined positions on the outer surface of the unit inner tube 50 corresponding to the ring bit 3 without using the bit device 55.

(D) In the above example, the ring bit can be omitted if the diameter of the taper bit is equal to or larger than the outer diameter of the outer tube.

(E) In the above example of installation, it is not necessary to remove the tapered bit 6 underground. In this case, the tapered bit 6 must be pulled out on the ground or in a previously formed shaft, or the tapered bit 6 at the tip of the inner pipe 5 must be removed. The diameter can be reduced to such an extent that it can be pulled out through the pipe 2, and the tapered bit 6
You can also pull out with it. In the latter case, even if the diameter of the tapered bit 6 is reduced, the hole formed by the tapered bit 6 can be expanded by the ring bit 3 if the ring bit 3 is provided after that, so that the outer pipe 2 can be entrained and inserted.

(F) As a means for detachably attaching the tapered bit 6 in the above-described example of installation, a well-known detachable connection structure can be adopted in addition to the screw connection.

[0042]

As described above, according to the present invention, a pipe device having a high mounting strength between the resin pipe portion and the joint device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a construction state of a pipe building apparatus.

FIG. 2 is a cutaway view of a unit outer tube to which the present invention is applied.

FIG. 3 is a schematic diagram of a main part.

FIG. 4 is an exploded cutaway view of the ring bit holder.

FIG. 5 is a front view and a side view of the holder clutch.

FIG. 6 is a side view and a front view of the bit clutch.

FIG. 7 is a side view showing an engaged state of the clutch.

FIG. 8 is a cutaway view of a ring bit and a holder.

FIG. 9 is a front view of the ring bit.

FIG. 10 is a longitudinal sectional view of a main part of a ring bit.

FIG. 11 is a longitudinal sectional view of a unit inner tube.

FIG. 12 is a cutaway view of a bit device.

FIG. 13 is a front view of the bit device.

FIG. 14 is a cutaway view of a bit reducer.

FIG. 15 is a plan view of a tapered bit.

FIG. 16 is a side view of the tapered bit.

FIG. 17 is a vertical sectional view of a main part of a tapered bit.

FIG. 18 is a rear view of the tapered bit.

FIG. 19 is a construction procedure diagram.

FIG. 20 is a construction procedure diagram.

FIG. 21 is a construction view.

FIG. 22 is an explanatory diagram of direction control.

FIG. 23 is an explanatory diagram of direction control.

FIG. 24 is a cutaway view showing a state when the taper bit is removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Built-in apparatus, 2 ... Outer pipe, 20 ... Unit outer pipe (equivalent to the pipe apparatus of this invention) 3 ... Ring bit, 5 ... Inner pipe, 6 ... Taper bit, 7 ... Rotary propulsion apparatus.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Atsushi Miyake, 4-35, Kudankita, Chiyoda-ku, Tokyo Inside Light Industry Co., Ltd. (72) Wataru Yokoyama 4-35, Kudankita, Chiyoda-ku, Tokyo No. Light industry Co., Ltd. F term (reference) 2D054 AC18 AD28 3H013 GA08 3H111 AA01 BA15 CB02 CB14 CB27 CB28 DA26 DB16

Claims (5)

[Claims] 1. A pipe device in which a tubular joint device for connecting pipes in series is attached to an end portion of a resin tube portion, and a male screw portion is provided on an outer peripheral surface at an end portion of the joint device on a pipe mounting side. A double-structured part comprising an outer pipe part having an inner pipe part and a female screw part having a tightening direction opposite to that of the male screw part on the inner peripheral surface, wherein an end of the resin pipe part is formed on the outer circumference of the inner pipe part. By sandwiching in the gap between the external thread portion of the surface and the internal thread portion of the inner peripheral surface of the outer tube portion,
A pipe device, wherein a joint device is attached to the resin pipe portion. 2. The pipe device according to claim 1, wherein a female screw portion is formed on an inner surface of an end of the resin tube portion so as to be screwed with a male screw portion on an outer peripheral surface of the inner tube portion of the joint device. 3. The pipe device according to claim 1, wherein a male screw portion screwed with a female screw portion on an inner peripheral surface of the outer tube portion of the joint device is formed on an outer surface of an end portion of the resin tube portion. 4. The tube apparatus according to claim 1, wherein a tip of said inner tube is formed to protrude from a tip of said outer tube. 5. The device according to claim 1, wherein the device is inserted into the ground while resisting friction with the surroundings and receiving a rotational force around the axis or maintaining a state where there is a danger of the rotational force. A tube device according to any one of the preceding claims.