JP2966320B2 - Pipe burial equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe burying apparatus.

[0002]

2. Description of the Related Art When burying pipelines such as sewers underground,
For the extension, there is a method in which earth and sand are dug out to a predetermined depth from the ground surface to form an excavation trench, and a buried pipe is piped, and then the earth and sand are backfilled. According to this method, a long buried pipe can be easily piped, but the work of digging and reburying the earth and sand over the entire extension is extremely inefficient, and the work cost increases. In some cases, it is necessary to provide a pipe below a place where soil cannot be dug from the ground surface, for example, a place where a building is built on the ground. Such cases are common in urban areas.

[0003] In order to solve the above-mentioned problems, in a stratum composed of clayey material or relatively small-grained conglomerate, a predetermined distance is set, for example, at two points about 50 m apart from each other on the extension of the pipeline to be buried. A shaft with a diameter (for example, a starting shaft having a diameter of 2 m and a reaching shaft having a diameter of 1 m) is drilled, and a tunnel (lateral hole) is drilled so as to pass between the two shafts. Then, along with the excavation of the lateral hole, a buried pipe having a length of about 1 m is sequentially connected and pushed into the excavated lateral hole to form a conduit communicating between the two shafts. To form the lateral hole, a screw (auger) that has a rotating cutter unit at its tip and is continuously connected to the rotating shaft of the cutter unit at the rear is used. The cutter portion scrapes the stratum and discharges the shaved soil with an auger provided with spiral blades. A powerful propulsion drive using hydraulic pressure or the like is used to push the cutter portion and the auger to dig the side hole and to sequentially push the buried pipe externally fitted to the auger into the side hole. Further, in order to make the side hole straight, a tip portion provided with a cutter portion is formed to be bendable so that the traveling direction can be changed, a target is provided on the back surface side of the cutter portion, and a predetermined The course is adjusted so as to go straight while monitoring the deviation of the target from the straight orbit.

[0004]

However, the distal end portion having the above-described straight traveling function has a complicated structure and is a very heavy device. Therefore, there is a problem that the device is difficult to transport or install, and workability is poor. In particular, in the case of work in an urban area, there are many restrictions such as the inability to properly introduce heavy equipment, and there has been a problem that it is very difficult to handle. In addition, excavated earth and sand passes through the inside of the buried pipe and is discharged by the auger. Therefore, in the case of a buried pipe having a surface hardness such as a large concrete pipe, there is relatively no problem. In the case of pipes (called "PVC"), there is a problem that the inner wall surface is damaged. If the inner wall surface of the PVC pipe is damaged,
The fluid resistance rises. Therefore, an object of the present invention is to provide a pipe burying device that can be buried without being damaged, and can be buried without damaging the inner wall surface of the buried pipe.

[0005]

The present inventor has the following arrangement to achieve the above object. That is, the present invention excavates a tunnel in the ground, and embeds a buried pipe of a predetermined length buried in the ground by a propulsion drive mechanism including a pressing portion main body that reciprocates in a predetermined section from the starting portion to the reaching portion. A pipe embedding device that sequentially pushes in to form a long conduit between the starting portion and the arrival portion, and is provided with a smaller diameter than the embedded tube,
A lead pipe that is previously passed from the starting section to the arrival section along a path in which the buried pipe is buried, and is rotatably connected to the lead pipe, and is rotated to excavate underground into a tunnel. A cutter portion, a screw provided with spiral blades for discharging earth and sand excavated by the cutter portion, and a screw sequentially connected so as to rotate integrally with the cutter portion along the path behind the cutter portion; A discharge pipe which is fitted to the screw and fitted inside the buried pipe, is pushed and connected sequentially from the starting portion to the arrival portion by the propulsion drive mechanism similarly to the buried pipe, and becomes a conduit for discharging earth and sand,
A closing member that closes a gap between the buried pipe and the discharge pipe, and is adjacent to the rear of the cutter unit and the
The above-mentioned buried pipe on the foremost side which is disposed so as to be externally fitted to the screw
Is equivalent to connectable to and disconnectable from a buried pipe
Outer tube made of abrasion-resistant steel tube, etc.
And a pipe portion corresponding to the discharge pipe on the most front side is a discharge pipe.
Attached to the pipe with the same diameter so that it can be connected and disconnected, and wear-resistant
An inner pipe section made of a steel pipe or the like having a
Closes the gap between the outer tube and the inner tube,
A ring member for detachably connecting the two pipe sections,
The installation pipe and the discharge pipe are pipes made of vinyl chloride material.

[0006]

[0007] Further, the inner pipe portion is provided to be shorter than the length of the screw connected to the cutter portion, and the outer pipe portion is provided to be shorter than the length of the inner pipe portion. The members can be easily connected.

[0008] Further , on the pressing surface side of the pressing portion main body of the propulsion drive mechanism, it is possible to interpose between the pressing tube and the buried pipe so as to be pressable and to adjust the distance between the rear end of the buried pipe and the pressing surface. abutment buried pipes abutting ring shape, and the pushing ring member of buried pipe which is movable in a predetermined range by screwing the child or the like,
On the pressing surface side, a ring-shaped abutting portion that is in contact with the buried pipe so as to be able to press and interpose between the discharge pipe and adjust the distance between the rear end of the discharge pipe and the pressing face , by and a pressing ring member of the discharge pipe which is movable in a predetermined range by screwing the child or the like, can be preferably pushed by a propulsion drive mechanism in the discharge tube and buried pipes.

[0009]

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a main part of an embodiment of a pipe burying apparatus according to the present invention, and FIG. 2 is a side view showing a state in which a propulsion drive mechanism of the embodiment of FIG. 1 is disposed in a shaft. . 10 is a propulsion drive mechanism,
A pressing portion main body 12 that reciprocates in a predetermined section is provided. (As shown in FIG. 2, the pressing portion main body 12 can reciprocate in a predetermined section in the direction A on the base 10a.)
Is a driving source for excavating a tunnel (for example, a side hole) in the ground, and a buried pipe 14 of a predetermined length buried in the ground.
Is sequentially driven from a starting pit (for example, a shaft which is a pit dug downward) as a starting portion to a reaching pit which is a reaching portion. The propulsion drive mechanism 10 forms a lateral hole and simultaneously inserts the buried pipes 14 sequentially. At that time, the buried pipes 14 are connected to each other to form a long pipeline from the starting pit to the reaching pit. .

Reference numeral 16 denotes a lead pipe, which is provided with a smaller diameter than the buried pipe 14 and is passed from a starting pit to an arrival pit in advance along a path in which the buried pipe 14 is buried. This lead tube 1
In the process of passing through 6, the sediment is not discharged, and the reed pipe 16 is pushed into the ground in a compacted state. In addition, this lead tube 1
Reference numeral 6 is provided so that the single bodies basically provided with the same length as the length of the buried pipe 14 can be sequentially connected and extended. A head portion 17 is attached to the tip of the lead tube 16. The head 17 has a tip formed on a slope 17a as shown in FIG. The lead tube 16 is basically pushed into the ground by the propulsion driving device 10 so as to go straight, but the dynamic pressure applied to the slope 17a and the lead tube 1
The course may shift depending on the balance of own weight of 6, and the condition of the stratum. At that time, the lead tube 16 is rotated to change the direction of the dynamic pressure applied to the slope 17a, thereby adjusting the traveling direction of the lead tube 16 and moving straight.

A method for monitoring whether or not the lead tube 16 is moving straight includes, for example, the following method. First,
A luminous body that emits light backward is mounted inside the head unit 17. Although the lead tube 16 is connected and extends long,
Since the tube is a tube, if it is connected in series, the luminous body can be seen from the propulsion driving device side. That is, the traveling direction of the lead tube 16 can be checked by monitoring whether or not the luminous body is on a predetermined orbit by using another luminous body with the luminous body as a target.

Reference numeral 18 denotes a cutter, which is connected to a rear end of the lead pipe 16 from a starting pit to a destination pit by a connecting portion 19. The cutter unit 18 is rotatably connected to the lead pipe 16 about an axis, and excavates in the ground in a tunnel shape by rotating. Even when the cutter unit 18 rotates so as to excavate underground, the lead tube 16 does not rotate because the cutter unit 18 is rotatably connected to the lead tube 16. The cutter unit 18 scrapes off the earth and sand, and discharges the shaved earth to the rear.
A plurality of digging blade portions 18c are provided diagonally between the shaft 18a and the outer cylindrical portion 18b. Outer end 1 of this excavation blade 18c
Reference numeral 8d protrudes slightly from the outer surface of the outer cylindrical portion 18b, so that the earth and sand can be suitably removed.

Reference numeral 20 denotes a screw.
Are sequentially connected so as to be able to rotate integrally with the cutter portion 18 along the axis of the horizontal hole. A spiral blade 20b for discharging excavated earth and sand is provided on the outer periphery of the shaft 20a.

Reference numeral 22 denotes a discharge pipe, which is externally fitted to the screw 20 and also internally fitted to the buried pipe 14, similarly to the buried pipe 14, sequentially pushed from the starting pit to the destination pit by the propulsion drive mechanism 10 and connected therewith. Is a pipe that discharges air.

Reference numeral 24 denotes a ring member, which is an example of a closing member. The ring member 24 is adjacent to the rear of the cutter unit 18 and is fitted to the screw 20 so as to be fitted on the screw 20.
Is closed and the two pipe sections are detachably connected. In the present embodiment, both pipe portions are fixed so as to abut and cover the leading ends of the two pipe portions. Thereby, it is possible to prevent earth and sand from entering the concentric gap between the buried pipe 14 and the discharge pipe 22 and prevent the inner wall surface of the buried pipe 14 from being damaged. Although not shown, the ring member 24 includes
For example, it is fixed to a pipe portion corresponding to the buried pipe 14 and the discharge pipe 22 with screws.

In this embodiment, the cutter unit 18 is used.
The portion corresponding to the foremost buried pipe 14 arranged adjacent to the rear of the pipe is not actually buried, but is repeatedly buried.
4 is provided as a tube at the tip of the tip. Also,
A pipe portion corresponding to the discharge pipe 22 on the most front side is formed with improved durability. Specifically, the outer pipe portion 26 is provided with an equivalent diameter so as to be connected to and detached from the buried pipe 14 and is formed of a wear-resistant metal material (for example, a steel pipe), and is connected to and disconnected from the discharge pipe 22. The inner tube portion 28 is formed to have a diameter as equal as possible and made of a wear-resistant metal material (for example, a steel tube). The outer double tube section 30 is constituted by the outer pipe section 26 and the inner pipe section 28, and the ring member 24 that closes the gap between the two pipes and detachably connects the two pipes. The other buried pipe 14 and the discharge pipe 2
2 is a PVC pipe.

Further, an intermediate outer pipe portion 26a provided by a PVC pipe is interposed between the outer pipe portion 26 and the buried pipe 14, and the inner pipe portion 28 is connected between the discharge pipes 22. An intermediate inner pipe portion 28a provided by a PVC pipe is interposed. The intermediate outer tube portion 26a is not embedded like the outer tube portion 26, and is used repeatedly as a part of the double-end tube portion 30. In this way, the tip double pipe section 30 is provided so as to be splittable so that it can be disassembled and taken out in the arrival shaft. The arrival pit does not need to dispose the propulsion drive device 10 and basically has a size that allows the lead tube 16 to be taken out, and is often provided at about half the diameter of the starting pit. Therefore, it is configured such that the double-ended pipe section 30 taken out at the arrival shaft can be divided. Further, the provision of the intermediate outer tube portion 26a and the intermediate inner tube portion 28a prevents the buried tube 14 and the discharge tube 22 from being damaged. this is,
The intermediate outer fitting part 26a and the intermediate inner pipe part 28a are connected to the normal buried pipe 14 and the discharge pipe 2 so that the extremity part where the excavation is performed is easily worn out, and this part is considered as a worn out part and is easily replaced.
This is because it is appropriate to make the length shorter than 2.

Further, as is apparent from FIG.
The inner tube portion 28 is provided to be shorter than the length of the screw 20 directly connected to 8, and the outer tube portion 26 is provided to be shorter than the length of the inner tube portion 28. And the intermediate outer fitting portion 2
6a and the intermediate inner tube portion 28a are provided at substantially the same length. Also, with respect to the length of the screw 20, the inner pipe portion 2
8 and the length of the intermediate inner tube portion 28a are shorter. The lengths of the screw 20, the buried pipe 14, and the discharge pipe 22 are set to be the same. Therefore, screw 2
The buried pipe 14 and the discharge pipe 22 are connected so that a step is always formed at the rear end. As described above, since there is always a step between the pipes, if the pipes are connected sequentially from the inside, the connecting portions can be exposed, and the connecting work can be easily performed, and the working efficiency can be improved.

In this embodiment, each pipe is set to be connected by a screw-in type. However, it is preferable to provide a thread-cut side as shown in FIG. 1 in relation to a surface in contact with earth and sand. That is, the buried pipe 14, the intermediate outer pipe 26a, and the outer pipe 26
, The rear end is formed into a female screw and the front end is formed into a male screw. Also, the discharge pipe 22, the intermediate inner pipe part 28a
And in the inner tube part 28, the rear end side is formed into a male screw,
The tip is formed as a female screw. Thereby, it can prevent that a screw is damaged by friction with earth and sand. In addition, the inner tube portion 28 and the intermediate inner tube portion 28a are prevented from rotating together with the rotation of the screw 20 so that the inner tube portion 28
And the intermediate inner tube portion 28a, the outer tube portion 26 and the intermediate outer tube portion 26a
Are engaged by the detent portions 29 provided respectively. That is, since the outer pipe part 26, the intermediate outer pipe part 26a, and the buried pipe 14 are inserted into the ground in a press-fit state, they do not rotate. If the inner cylinder 28 and the like are engaged with this, the screw 20 does not rotate.

Reference numeral 31 denotes a push ring member of the buried pipe, which is interposed between the buried pipe 14 and the pressing surface 12a of the pressing portion main body 12 for reciprocating the propulsion drive mechanism 10 and pushing the buried pipe 14 and the like. A ring-shaped abutting portion 31a that can be pressed and adjusts the distance between the rear end of the buried tube 14 and the pressing surface is provided so as to be movable in a predetermined range by a screw in contact with the buried tube 14. Reference numeral 32 denotes a pressing ring member of the discharge pipe, which is interposed between the pressing face 12a and the discharge pipe 22 so as to be pressurizable, and adjusts the interval between the rear end of the discharge pipe 22 and the pressing face 12a. Ring-shaped contact portion 32 that makes contact with buried pipe 22 as much as possible
a is provided so as to be movable in a predetermined range by a screw.

As described above, by providing the buried pipe push ring member 31 and the discharge pipe push ring member 32, even when the buried pipe 14 and the discharge pipe 22 have a dimensional error, etc.
It is possible to prevent the cutter unit 18 from being caught by a strong force. Buried pipe 14 and discharge pipe 22
Can use commercially available PVC pipes, but there are dimensional errors,
It does not always expand and contract due to changes in temperature. For example, when as many as about 50 buried pipes 14 are connected, a small dimensional error eventually results in a large dimensional error. However, the above-described pressing ring members 31 and 32 preferably solve this problem. It can be eliminated. In consideration of the above-described error, a slight gap is provided in the initial stage between the cutter portion 18 and the distal end surface of the distal double tube portion 30 (the distal end side surface of the ring member 24) as shown in FIG. (For example, 20
mm).

Next, an embodiment of the screw 20 will be described with reference to FIGS. The helical blade 20b is adapted so that the screw 20 can cope with each buried pipe having a different diameter.
Was variably provided. Specifically, a plurality of mounting holes 34 are formed at predetermined intervals on the blade 20b of the screw 20 as shown in FIG. 3, and a spacer provided with a plurality of mounting holes 35 as shown in FIG. The outer diameter of the screw 20 is changed by mounting the screw 36 with a screw (not shown) or the like so that both mounting holes are aligned. In this way, as shown in FIG. 5, spiral blades of different sizes can be attached to the same shaft 20a. As the diameter increases, the maximum gravel diameter can be increased. Therefore, in the case of a formation containing large-diameter gravel, a screw with a large blade can be used to fill a large-diameter buried pipe so that excavation work can be suitably performed.
Therefore, the entire apparatus system can be simplified. Further, the screw 20 is formed of an iron material.
a is the same, the weight change is small, and it is easy for the operator to handle.

Next, a construction method using the pipe burying apparatus of this embodiment will be described with reference to FIGS. First,
As shown in FIG. 6, the head tube 17 is headed from the starting shaft 38, the lead tubes 16 are sequentially connected, and the lead tube 16 passes through the reaching shaft 40. As described above, the slope 17a of the head portion 17
Use to adjust and go straight. The driving force for pushing the lead pipe 16 is provided by the propulsion driving device 10 fixed to the bottom surface of the starting shaft 38. Further, the rear end of the lead tube 16 is fixed to the rotation output shaft 11 of the propulsion drive device 10 by a connecting portion 11a, and is rotated when the direction is corrected so as to proceed straight.

Next, as shown in FIG.
6, the cutter portion 18 is rotatably connected to the connecting portion 19 by a connecting portion 19,
A screw 20 is connected to the cutter unit 18 so as to rotate integrally. The tip double pipe section 30 is externally fitted to the tip screw 20 and, as described above, the intermediate inner pipe section 28a, the intermediate outer pipe section 26a, the discharge pipe 22, the buried pipe 14, and the next screw 20, The discharge pipe 22 and the buried pipe 14 are sequentially connected. The rear end of the screw 20 is connected to the rotary drive shaft 11 to the propulsion drive device 10,
It is driven to rotate. Further, the intermediate outer pipe portion 26a, the intermediate inner pipe portion 28a, the buried pipe 14, and the discharge pipe 22 abut against the pressing ring members 31, 32, respectively, and the cutter unit 18 and the screw 20 are driven by the driving force of the propulsion driving device 10. Is pushed into the excavated tunnel. Reaching pit 4
The lead pipes 16 protruding to zero are sequentially disassembled, and
Remove from

The screw 20, the discharge pipe 22 and the buried pipe 14 are sequentially connected. When the double-ended pipe section 30 reaches the reaching pit 40, the cutter section 18, the double-ended pipe section 30 and the intermediate outer pipe section 26a are connected. , And disassembled and taken out from the arrival shaft 40. In order to disassemble the tip double tube portion 30, first, the ring member 24 is removed, only the outer tube portion 26 is pressed and pushed out by the propulsion drive device 10, and the engagement of the detent with the inner tube portion 28 is released. Loosen screws. The intermediate outer tube portion 26a is removed in the same manner. Next, the screw 20 and the discharge pipe 22
It is pulled back to the starting shaft 38 and is sequentially removed in the starting shaft 38. As a result, only the buried pipe 14 remains in the excavated tunnel, and a desired pipeline is suitably formed.

The PVC pipe used for the discharge pipe 22 may be formed by applying a hard coating on the inner wall surface for abrasion resistance. The rotation preventing portion 29 may be formed of a polypropylene resin or the like so as not to damage the PVC pipe. Also, the discharge pipe 22
The use of a PVC pipe is also preferable in that even if the screw 20 is slightly deformed, it can flexibly cope with the deformation. That is, with a steel screw on a steel pipe,
In some cases, they may bite each other and become inoperable, whereas PVC pipes have a large allowable range. As described above, the present invention has been described variously with reference to preferred embodiments. However, the present invention is not limited to the embodiments, and it is needless to say that many modifications can be made without departing from the spirit of the invention. That is.

[0028]

According to the pipe burying device of the present invention, it is possible to reduce the weight of the distal end portion and to use a PVC pipe for the discharge pipe, so that the weight can be reduced and all the work can be performed by one person. Further, since the earth and sand discharged and the blades of the screw do not contact the inner wall surface of the buried pipe, the buried pipe can be preferably buried underground without damaging the inner wall surface of the buried pipe. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a side view showing an installation state of the propulsion drive mechanism according to the embodiment of FIG. 1;

FIG. 3 is a perspective view showing one embodiment of a screw according to the present invention.

FIG. 4 is an explanatory view showing one embodiment of a spacer fixed to the screw in FIG. 3;

FIG. 5 is a sectional view showing a use state of the screw of FIG. 3;

FIG. 6 is an explanatory diagram illustrating a construction method according to the present invention.

FIG. 7 is an explanatory diagram illustrating a construction method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Propulsion drive mechanism 12 Pressing part main body 14 Buried pipe 16 Lead pipe 18 Cutter part 20 Screw 22 Discharge pipe 24 Ring member 26 Outer pipe part 28 Inner pipe part 30 Double tip pipe part

Claims (4)

(57) [Claims] 1. A buried pipe of a predetermined length buried in the ground by a propulsion drive mechanism having a pressing portion main body that reciprocates in a predetermined section while excavating a tunnel in the ground from a starting portion to a reaching portion. A pipe embedding device that sequentially pushes in and forms a long conduit between a start section and a reaching section, and is provided with a smaller diameter than the buried pipe, and from a start section in advance along a path in which the buried pipe is buried. A lead pipe passed to the reaching part, a cutter part rotatably connected to the lead pipe, rotating and excavating in the ground in a tunnel shape, and a spiral discharging the soil excavated by the cutter part A screw that is sequentially connected to the cutter unit behind the cutter unit so as to rotate integrally with the cutter unit along the path of the cutter unit; Like the pipe, Coupled with sequentially pushed from the starting portion to reach part by the driving mechanism, comprising: a discharge tube comprising a conduit for discharging the sediment, and a closing member for closing the gap between the exhaust pipe and the buried pipes, the cutter Screw adjacent to the rear of the part
Corresponds to the above-mentioned buried pipe on the foremost side, which is disposed externally
The pipe section is provided with the same diameter so that it can be connected to and disconnected from the buried pipe.
Outer tube made of wear-resistant steel pipe, etc.
A pipe section corresponding to the discharge pipe on the tip side is connected to the discharge pipe.
Abrasion-resistant steel that has the same diameter as
An inner pipe portion made of a pipe or the like, wherein the closing member closes a gap between the outer pipe portion and the inner pipe portion.
And a ring member that detachably connects both pipes.
And the buried pipe and the discharge pipe are pipes made of a vinyl chloride material.
An apparatus for burying pipes, comprising: 2. The method according to claim 1, wherein the inner pipe is provided to be shorter than a length of a screw connected to the cutter, and the outer pipe is provided to be shorter than the length of the inner pipe. The pipe burying device according to claim 1 . 3. A protruding drive mechanism, on a pressing surface side of a pressing portion main body, interposed between the pressing tube and the buried pipe so as to be pressurizable, and a gap between a rear end of the buried pipe and the pressing surface is adjustable. abutment buried pipes abutting ring shape, and the pushing ring member of buried pipe which is movable in a predetermined range by screwing the child or the like, on the pressing surface, interposed between the discharge pipe pressable discharged, and abutment spacing adjustable buried pipes abutting ring to the rear end and the pressing surface of the discharge pipe, which is movable in a predetermined range by threaded child like Te The pipe burying device according to claim 1 , further comprising a pipe ring member. 4. Excavation of a tunnel underground
Propulsion drive mechanism with a pusher body that reciprocates in the section
Therefore, a buried pipe of a predetermined length buried underground is
From the starting part to the reaching part.
A pipe burying device for forming a pipe, wherein the apparatus is provided with a smaller diameter than the buried pipe, and wherein the buried pipe is buried.
Along the path to be taken
And over de tube, it is rotatably coupled to the lead tube, underground rotated
Part that excavates the soil in a tunnel shape, and a spiral part that discharges the earth and sand excavated by the cutter part
A blade is provided along the path behind the cutter.
And connected sequentially so that they rotate together with the cutter part
A screw , externally fitted to the screw and internally fitted to the buried pipe,
From the starting part by the propulsion drive mechanism as well as the buried pipe
It is pushed into the arrival part sequentially and connected, and the earth and sand is discharged
Pipe, and a closing member for closing a gap between the buried pipe and the discharge pipe
If, on the pressing surface of the pressing portion main body of the propulsion drive mechanism, the embedded
Push between the pipe and the back end of the buried pipe.
A ring that abuts the buried pipe so that the distance from the pressing surface can be adjusted
Shaped contact part can be moved within a predetermined range by screws etc.
It is possible to interpose and press between the push ring member of the buried pipe provided and the discharge pipe on the pressing surface side.
The distance between the rear end of the discharge pipe and the pressing surface can be adjusted
The ring-shaped contact part that contacts the buried pipe is
Pressing ring part of the discharge pipe provided movably within a predetermined range
A pipe burying device comprising: