JPH0688483A - Drawing-in device of pipe to be buried to underground - Google Patents

Abstract

PURPOSE:To save time for a repairing work due to ground subsidence so as to improve workability. CONSTITUTION:A discharge pipe 17 is provided, which can be inserted into a pipe to be buried 11 connected to the extreme end side of a propulsion pipe 4 inserted in the ground while drilling, and used for discharging drilled soil. A discharge connecting part 35 for connecting to one end part of the discharge pipe 17 so as to communicate to a space spread with an expansion reamer 15 is provided on a buried pipe connecting tool 18, under the condition in which the discharge pipe 17 is inserted through in the pipe to be buried 11. In the condition in which the connecting parts 36 of the buried pipe connecting tool 18 against the pipe to be buried 11 and the discharge pipe connecting part 35 are respectively connected to the pipe to be buried 11 and the discharge pipe 17, an air flow passage R for letting the air for suction flow is formed between them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted between a propulsion pipe inserted into the ground while excavating and a buried pipe connected to the tip side of the propulsion pipe, and the pulling pipe is pulled back. When burying the buried pipe in the ground, an expanded reamer that expands the diameter while digging the inner surface of the underground hole is provided, and a buried pipe connector that is connected to the expanded reamer is provided. Relating to the middle retractor.

[0002]

2. Description of the Related Art Heretofore, the above-mentioned underground pipe retraction device for an embedded pipe has been constituted only by an expansion reamer and an embedded pipe connector. Then, the excavated soil and the lubricant used during excavation are discharged to the outside of the ground through the space between the outer peripheral surface of the buried pipe and the inner wall of the underground hole.

[0003]

However, according to the above configuration, the excavated soil and the lubricant used during excavation are
Since the air between the outer peripheral surface of the buried pipe and the inner wall of the underground hole was discharged to the outside of the ground, the diameter of the underground hole should be smaller than the diameter of the buried pipe so that excavated soil can be discharged smoothly. It has to be made quite large, and if so,
A large space was created between the outer peripheral surface of the buried pipe and the inner wall of the underground hole, and there was a risk that the ground would sink later. The present invention is
It is an object of the present invention to solve the above-mentioned conventional drawbacks and provide an underground pipe retraction device for a buried pipe capable of preventing the risk of ground subsidence after construction.

[0004]

In order to achieve the above object, an underground pipe retraction device for a buried pipe according to the present invention is capable of being inserted into a buried pipe, excavated soil, and a lubricant used during excavation. A discharge pipe for discharging the discharge pipe, and a discharge pipe for connecting one end of the discharge pipe so as to communicate with the space expanded by the expansion reamer in a state where the discharge pipe is inserted into the buried pipe. A connecting portion is provided in the buried pipe connector, and a suction device for sucking the lubricant and the excavated soil is connected to the other end of the discharge pipe, and the buried pipe connector is connected to the buried pipe. Portion and the discharge pipe connecting portion are separately connected to the buried pipe and the discharge pipe, and an air flow for circulating the suction air between them in accordance with the operation of the suction device. It is characterized by forming a path, its effect It is as follows.

[0005]

That is, according to the above construction, the discharge pipe for discharging the lubricant and the excavated soil is inserted into the buried pipe, and the space expanded by the expansion reamer is connected to the space inside the discharge pipe. Since the lubricant and the excavated soil can be discharged to the outside of the underground hole while suctioning with a suction device through the discharge pipe, the difference between the diameter of the underground hole and the diameter of the buried pipe can be calculated. The space between the outer peripheral surface of the buried pipe and the inner wall of the underground hole becomes smaller after the buried pipe is buried in the ground, and the ground subsidence after construction can be prevented. Moreover, in a state where the connecting portion of the embedded pipe connecting tool for the embedded pipe and the connecting portion for the discharge pipe are separately connected to the embedded pipe and the discharge pipe,
Since an air flow path for circulating the suction air along with the operation of the suction device is formed between them, the suction air is operated from the outside of the underground hole by operating the suction device. And the discharge pipe, and can be sent to the suction port of the discharge pipe through the air flow passage, and as a result, in the space between the buried pipe and the discharge pipe, the suction port side of the discharge pipe. Since the air flows toward, the excavated soil can be efficiently and smoothly discharged to the outside through the discharge pipe by the conveying force of the air, and further, for example,
Compared with the case where air for suction is sent to the suction port of the discharge pipe through the space between the inner wall of the underground hole and the outer periphery of the buried pipe,
Excavation soil and the like are less likely to enter the space between the buried pipe and the discharge pipe, and the cleaning work inside the buried pipe after the diameter of the underground hole has been expanded can be eliminated.

[0006]

[Effects of the Invention] Therefore, since it is possible to prevent the risk of ground subsidence after construction while performing diameter expansion excavation with good workability, it is possible to save the labor of repair work due to ground subsidence and to expand the underground hole. Since it is possible to eliminate the need for cleaning the inside of the buried pipe after completion, it is possible to provide an underground pipe retraction device with excellent workability.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 4 shows the underground pipe drawing facility 1 for the burying pipe installed on the second construction pit B side and the propulsion device 2 for the propulsion method installed on the first construction pit A side.

The underground lead-in facility 1 is a facility for winding and holding the buried pipe, and is constructed by installing a buried pipe winding drum 10 outside the ground portion of the second construction pit B. A corrugated pipe 11 as an embedded pipe is wound around the embedded pipe winding drum 10. The propulsion device 2 is
A device for propelling the soil between the first construction pit A and the second construction pit B to form an underground hole therein, and for retracting the underground hole to expand the diameter and pull the corrugated pipe 11 into the ground. Then, the propulsion unit 5 that propels the soil to form an underground hole, the propulsion unit winding drum 6 installed outside the ground part of the first construction pit A, and the subterranean ground while pressing the propulsion unit 5. And a pushing mechanism 7 for pulling it back to the ground or pulling it back from the ground. The propulsion unit 5 bends a drill pipe 3 having a drill head (not shown) at its tip and a plurality of push-up pipes 4 following the drill pipe 3 through a joint (not shown). It is configured by connecting in advance. The pressing mechanism 7 is installed at the bottom of the first construction pit A and is composed of a combination of a clamper 7a and a pressing cylinder 7b. To the pressing mechanism 7, the propulsion unit 5 is supplied from the propulsion unit winding drum 6 via the guide roller 8. Then, the propulsion unit 5 is clamped to the clamper 7a and the pressing cylinder 7b is operated to move forward, whereby the propulsion unit 5 is moved forward, and the pressing cylinder 7b is operated to move backward while the clamper 7a is released. The preparation of the clamp of the new portion of 5 is performed, and by repeating this, the pushing from the rear for propelling the propulsion unit 5 is performed. In the figure, 9 is a support jack that supports the side wall of the construction pit A from the inside. When the propulsion unit 5 is moved backward, the reverse operation is performed. The second
A guide roller 12 is provided at the entrance of the construction pit B, and the corrugated pipe 11 wound around the buried pipe winding drum 10 is moved to the second position by the guide roller 12.
It will guide you into the construction pit B. In FIG. 4, the corrugated pipe 11 is connected to the propulsion unit 5 penetrating from the first construction pit A to the second construction pit B side via the underground retraction device 13, and the pressing mechanism 7 is reversely operated.
It shows a state in which the corrugated pipe 11 is pulled in and buried in the underground hole.

As shown in FIGS. 1 and 2, a drive shaft 14 that can be driven and rotated extends from the excavation pipe 3 at the tip of the propulsion unit 5, and an excavation head mounting portion is attached to the drive shaft 14. It is provided. In this embodiment, the excavation head is removed, and one end of the underground drawing device 13 of the buried pipe is connected thereto.

In order to construct the underground pulling device 13,
The expansion reamer 15 for expanding the diameter of the underground hole 50 formed by the excavation head and the discharge pipe 17 for discharging the excavated soil 16 are connected to both ends of the buried pipe connector 18, respectively. A suction device 19 for sucking the excavated soil 16 and the like is connected to one end of the discharge pipe 17.

As shown in FIGS. 1 and 2, the expanding reamer 15 includes a cylindrical expanding reamer body 20 and an excavating portion 21.
Are provided at four locations in the circumferential direction (that is, the circumferential direction of the underground hole 50). This expansion reamer 15 has a drive shaft 14
The expansion reamer body 20 is provided with a spline hole 22 into which the drive shaft 14 is fitted and a fixing bolt bolt insertion hole 23. Each of the excavation parts 21
Is provided with a plurality of digging blades 21A that are provided so as to project in the radial direction so as to have a cross shape, and that are arranged in parallel in the radial direction (that is, the radial direction of the underground hole 50) at regular intervals. The space between the excavating portions 21 is a discharge space 49 for discharging the excavated soil 16 and the like along the longitudinal direction of the underground hole 50. It should be noted that each excavation section 21 is provided with excavated soil, etc.
Guide vanes 27 are provided for guiding along the axis direction of 0.

On the outer peripheral portion of the excavation portion 21, a tubular portion 24 for mounting a buried pipe connector is continuously provided. The embedded pipe connector attachment cylinder portion 24 includes a cylindrical portion 41 on the side of the expansion reamer 15 and an embedded pipe connector attachment portion 29. The embedded pipe connector attachment portion 29 is formed by bolting a bearing retainer 31 to a ring member 30 fixed to a cylindrical portion 41, and the embedded pipe connector attachment portion 29 is provided with a suction air from the outside. A long hole-shaped through hole 32 is provided.

The excavating blade 21A of the expansion reamer 15 has
A nozzle 33 provided along the axial direction of the propulsion pipe 4 is brought close to the nozzle 33 to expand the lubricant or water.
5 is sprayed toward the discharge space 49.

The discharge pipe 17 is made of vinyl chloride and is inserted into the corrugated pipe 11. The suction device 19 is
This is a device for sucking the lubricant and the excavated soil 16 through a discharge pipe 17 and discharging them to the outside of the underground hole 50.

The buried pipe connector 18 has an enlarged reamer connecting portion 38 at one end of the cylindrical connector body 26 and an embedded pipe locking portion 36 as a connecting portion for the corrugated pipe 11 at the other end. The discharge pipe connecting portion 35 is provided. The enlarged reamer connecting portion 38 is configured such that the one end portion is formed so as to be freely fitted into the ring member 30. Then, the bearing 37 (an example of a rotating mechanism) and the bearing retainer 3 in a state where the one end is fitted in the ring member.
It is rotatably attached to the cylindrical portion 24 via 1. The discharge pipe connecting portion 35 has an inner diameter portion 43 for fitting the end portion of the discharge pipe 17 therein and is formed at the other end portion of the connecting body 26, and female screw portions 44 are formed at four positions in the circumferential direction of the other end portion. To connect the connector body 26 and the discharge pipe 17 to the other end of the connector body 26.
7. One end of 7 is fitted in, the connecting bolts 42 are screwed into the female screw portion 44 from the radial direction, and the tips of these bolts 42 are inserted through four bolts at the end of the discharge pipe 17 in the circumferential direction. The holes 45 are inserted respectively. The embedded pipe locking portion 36 includes a locking portion main body 40 that is externally fitted to the other end of the connector main body 26, and three locking portions that lock the corrugated pipe 11 from the inside at three circumferential positions thereof. It comprises a locking metal fitting 28. The connector main body 26 and the locking portion main body 40, and the locking portion main body 40 and the locking metal fitting 28 are bolted to each other. In the figure, D is a dust seal.

As shown in FIG. 1, the sizes of both are set so that a large space is formed between the outer diameter of the discharge pipe 17 and the inner diameter of the corrugated pipe 11.
8 are each formed in an arc shape that can be locked in an arc portion having a length corresponding to ⅙ of the entire circumference of the corrugated pipe 11, so that suction air accompanying the operation of the suction device 19 is generated. It is configured to be taken into the space from outside the underground hole, pass each locking metal fitting 28, and enter the through hole 32 of the ring member 30. That is, in the underground retraction device according to the present invention, the suction pipe 36 and the discharge pipe connecting portion 35 are connected to the corrugated pipe 11 and the discharge pipe 17, respectively, and suction air is provided between them. An air flow passage R for circulating the air is formed. As shown also in FIG. 3, the bolt insertion hole 39 for attaching to the locking portion main body 40 is formed as a long hole in the radial direction of the locking portion main body 40, and is engaged after being inserted into the corrugated pipe 11. The stopper 28 can be moved so as to project in the radial direction so as to be locked to the convex portion on the inner surface of the corrugated tube 11. In the above configuration, the drive shaft 14 is driven to drive the expansion reamer 1
When the propulsion unit 5 is pulled out from the soil while rotating 5, and the suction device 19 is operated at the same time,
The air from the outside enters the through hole 32 of the ring member 30 through the space between the exhaust pipe and the corrugated pipe 11, and is sucked into the suction port of the exhaust pipe 17 together with the lubricant and the excavated soil 16 to be ground. It is discharged outside the middle hole.

[Other Embodiments] In the above-mentioned embodiment, the tubular portion 24 for mounting the embedded pipe connector is continuously provided on the outer peripheral portion of the enlarged reamer 15. However, as shown in FIG. 5, the tubular portion 24 is not provided. The buried pipe connector 18 is formed in the shape of a shaft, and the drive shaft 14 has a shaft portion 18A of the buried pipe connector 18.
May be directly connected. As shown in the figure, suction air and the like enter the discharge pipe 17 through the suction port 18B formed around the bearing of the ring-shaped member.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an underground pipe retraction device for a buried pipe.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

[Fig. 4] Overall view of the ground pull-in facility and the propulsion device

FIG. 5 is a sectional view of another embodiment.

[Explanation of symbols]

 4 Propulsion pipe 11 Buried pipe 15 Expanded reamer 16 Excavation and soil discharge 17 Discharge pipe 18 Buried pipe connector 35 Discharge pipe connection part 36 Connection part R Air flow passage

Front Page Continuation (72) Inventor Masaya Hattori 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd.

Claims (1)

[Claims] 1. A propulsion pipe which is attached between a propulsion pipe (4) which is inserted into the ground while excavating and an embedded pipe (11) which is connected to a tip end side of the propulsion pipe (4). When the buried pipe (11) is buried in the ground by pulling back (4), an expansion reamer (15) is provided for expanding the diameter while excavating the inner surface of the underground hole (50). A buried pipe underground drawing device provided with a buried pipe connector (18) connected to (15), which is insertable into the buried pipe (11) and excavated and discharged (16).
And a discharge pipe (17) for discharging the lubricant used during excavation, and the discharge pipe (17) is connected to the buried pipe (1).
1) A discharge pipe connecting part (35) for connecting one end of the discharge pipe (17) so as to communicate with the space expanded by the expansion reamer (15) while being inserted into the inside.
Is provided in the buried pipe connector (18), and the suction device (19) for sucking the lubricant and the excavated soil (16) is connected to the other end of the discharge pipe (17), The buried pipe connector (1) for the buried pipe (11)
In the state where the connection part (36) of 8) and the discharge pipe connection part (35) are separately connected to the buried pipe (11) and the discharge pipe (17), the suction device is provided therebetween. (1
An underground pipe retraction device for an embedded pipe in which an air flow passage (R) for circulating the suction air is formed in association with the operation of 9).