JPH0673988A - Drawing-ion device of embedded pipe in the ground - Google Patents

Abstract

PURPOSE:To prevent excavated soil from staying in the joint of embedded pipes and securely discharge the excavated soil. CONSTITUTION:A cylindrical guide G to conduct the excavated soil brought by the actuation of an enlarging reamer 15 to one end of a discharge pipe is provided at a joint R of an embedded pipe to connect the embedded pipe 11 so as to be freely rotatable against the enlarging reamer 15. A fluid injection nozzle 25 to splash the fluid toward the cylindrical guide G is arranged in the clearance K between the embedded pipe 11 and the discharge pipe 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground pipe retraction device for a buried pipe. An expansion reamer that is freely attached and that expands the diameter of the underground hole when the propulsion pipe is pulled back, and an embedded pipe that is buried in the underground hole by replacing the propulsion pipe with respect to the expansion reamer. And a buried pipe connecting portion for relatively rotatably connecting to each other, the excavated soil generated by the operation of the expansion reamer being inserted and arranged in the buried pipe, and the one end portion by the suction force of the suction device connected to the other end portion. And a discharge pipe for sucking and discharging from the expansion reamer, and bypassing after passing through a gap between the discharge pipe and the embedded pipe connected to the expansion reamer via the buried pipe connecting portion, the discharge A buried pipe that forms a bypass air flow path leading to one end of the pipe On the ground the drawing device.

[0002]

2. Description of the Related Art In a conventional underground pipe retraction device for a buried pipe, a large-diameter cylindrical portion extending from a mounting portion of an expansion reamer to a tip side in an axial direction and a diameter smaller than the large-diameter cylindrical portion. The embedded pipe connecting portion is formed by connecting a small-diameter cylindrical portion for connecting the embedded pipe having the discharge pipe inserted thereinto via a bearing so as to be relatively rotatable. It was The large-diameter tubular portion is provided with the large-diameter tubular portion for opening the bypass air flow passage having a function of guiding the excavated soil discharged from the expansion reamer into one end of the discharge pipe at the buried pipe connecting portion. There was a communication opening through a part of the department.

[0003]

However, a part of the excavated soil discharged from the expanded reamer may be directly guided to the communication opening formed in the large-diameter cylindrical portion, and the excavated soil discharged from the expanded reamer is directly discharged. The communication port may be blocked by soil.
Then, once the blockage occurs, there is a problem that the bypass air flow path cannot perform its function and the excavated soil cannot be discharged smoothly. The present invention has been made in view of such an actual situation, and an object thereof is to provide a means capable of solving the conventional problem that the excavated soil cannot be reliably discharged.

[0004]

SUMMARY OF THE INVENTION An underground pipe retraction device for a buried pipe according to the present invention is produced by an operation of an expansion reamer at a buried pipe connecting portion for connecting the buried pipe to the expansion reamer such that the buried pipe is relatively rotatable. A cylindrical guide is provided for guiding the excavated soil to one end of a discharge pipe (that is, a pipe for sucking and discharging from one end by a suction force of a suction device connected to the other end). A characteristic feature is that a fluid ejection nozzle that ejects a fluid toward is disposed in a gap between the buried pipe and the discharge pipe.

[0005]

According to the underground retraction device having such a characteristic configuration, the guideway for guiding the excavated soil to the one end of the discharge pipe is formed by installing the tubular guide, and By putting the excavated soil on the bypass air flow path, the excavated soil can be moved along the guide path, so that the blockage of the communication port can be surely avoided. Moreover, even if the excavated soil is trying to stay in the gap between the installation portions of the tubular guides, the excavated soil is discharged from the fluid ejection nozzle disposed in the space between the buried pipe and the discharge pipe. The fluid ejected toward the cylindrical guide is blown off and removed.

[0006]

Therefore, according to the present invention, it is possible to reliably prevent the communication port from being blocked by the excavated soil and to prevent the excavated soil from accumulating in the tubular guide installation portion. Become. Therefore, the excavated soil can be reliably discharged, and the conventional problems can be solved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an underground pipe retraction device 1 for a buried pipe according to the present invention.
Are shown with a propulsion device 2 for the propulsion method.

First, the propulsion device 2 for the propulsion method will be described.

In the propulsion device 2 for the propulsion method, the propulsion direction from the first construction pit A to the second construction pit B (hereinafter, the front side of the propulsion direction is referred to as the base end side, and the opposite side is the front end side). The excavation pipe 3 provided at the tip with an excavation head (not shown) for excavating and forming the underground hole 50 (see FIG. 1) and a plurality of propulsion pipes 4 following the excavation pipe 3 form a joint portion (FIG. Propulsion unit 5 that is flexibly connected via (outside)
The main part is composed of the propulsion unit 5
Is configured to be pushed from the rear in the underground hole 50 by the pushing mechanism 7 and propelled in the propelling direction.

The pressing mechanism 7 is composed of a combination of a clamper 7a and a pressing cylinder 7b, and is installed at the bottom of the first construction pit A. Further, a propulsion unit winding drum 6 that winds up and stores the propulsion unit 5 is installed outside the ground portion of the first construction pit A.

To the pressing mechanism 7, the propulsion unit 5 rewound from the propulsion unit winding drum 6 is supplied through the guide roller 8. The pressing mechanism 7 is the propulsion unit. The forward movement of the propulsion unit 5 is performed by advancing the pressing cylinder 7b toward the distal end side while clamping 5 with the clamper 7a, and the pressing cylinder 7b is moved backward toward the base end side while the clamper 7a is released. By preparing the clamp of a new portion of the propulsion unit 5, by pressing the propulsion unit 5 from the rear by repeating these operations, by performing the pressing in accordance with the excavation formation of the underground hole 50, The propulsion unit 5 is adapted to be propelled in the propulsion direction.
In the figure, 9 is a support jack that supports the side wall of the construction pit A from the inside.

A buried pipe winding drum 10 is installed on the outside of the second construction pit B above the ground, and the buried pipe winding drum 10 is driven by the pulling back of the propulsion pipe 4 to the ground. A buried pipe 11 (specifically, a corrugated pipe) to be buried inside is wound and stored.

A guide roller 12 is provided at the entrance of the second construction pit B, and the buried pipe 11 unwound from the buried pipe winding drum 10 is moved by the guide roller 12 to the second construction pit. You will be guided to the inside of B.

Next, the construction of the underground retraction device 1 for the buried pipe (underground retraction device according to the present invention) will be described.

In the underground pipe retraction device 1 for the buried pipe, the expansion reamer 15 is detachably attached to the tip end portion of the propulsion pipe 4 which is propelled while excavating the underground hole 50 and inserted into the ground. And the diameter of the underground hole 50 is expanded by the expansion reamer 15 when the propulsion pipe 4 is pulled back,
It is used to pull the buried pipe 11 into the ground in place of the propulsion pipe 4.

The underground retraction device 1 is provided with an expansion reamer 15 for excavating and expanding the underground hole 50 formed by the excavation head, and excavation earth excavation and expansion due to the excavation expansion. A discharge pipe 17 inserted and disposed in the buried pipe 11 so as to suck and discharge a lubricant or the like, which is used for lubrication at the time of diameter, from one end by a suction force of a suction device 19 connected to the other end. Is equipped with.

As shown in FIGS. 1 and 2, the enlarged reamer 15 has a first connecting portion E to the tip of the propulsion tube 4.
Is provided on one end side, and the second connecting portion F for the buried pipe 11 is provided on the other end side. Further, as the propulsion pipe 4 is pulled back, the inner surface of the underground hole 50 is expanded while being excavated. The excavating part 21 having a diameter is configured by being provided between the first connecting part E and the second connecting part F.

In the excavating portion 21, a plurality of excavating blades 21A functioning as excavating portions of the underground hole 50 to expand the diameter of the underground hole 50 when the buried pipe 11 is pulled into the soil are radially arranged in the circumferential direction. (In this embodiment, four pieces) are evenly arranged and attached to the first connecting portion E by using bolts 13 (see FIG. 2).

The first connecting portion E is specifically, with respect to the drive rotatable shaft 14 extending from the excavation pipe 3 at the tip of the propulsion unit 5 to the removal portion of the propulsion head.
It is composed of a diameter-expanding reamer main body 20 to which the propulsion head (the propulsion head is removed in FIG. 1) is detachably mounted so that the excavating blade 21A is mounted. There is.

The portions to which the excavating blades 21A are attached to the first connecting portion E (that is, the diameter-expanding reamer main body portion 20) can be attached such that the excavating blades 21A can be slidably adjusted in the radial direction. It is configured to be able to. Specifically, the bolt insertion hole provided in the excavating blade 21A is formed in a long hole shape, and the slide movement adjustment is performed by changing the insertion position of the bolt 13 in the long hole-shaped bolt insertion hole. It has become. Therefore, based on the slide movement adjustment, the mounting position of the excavating blade 21A with respect to the first connecting portion E can be appropriately changed in the radial direction.

At the base end side of the expansion reamer 15, there is a gas-liquid jet nozzle 33 for spraying a fluid (specifically, water) together with the lubricant to the excavation portion 21, and an axial center of the propulsion pipe 4. It is provided along the direction.

Specifically, the second connecting portion F is composed of a small-diameter tubular buried pipe connector 18 which is lockable and connectable to the inner surface of the base end portion of the buried pipe 11 by a locking portion 18a. There is.

The expanded diameter reamer main body portion 20 (and the buried pipe connectors 18, 2 described below, which constitute a main portion of the expanded reamer 15)
In contrast to 4), as means for connecting the buried pipe 11,
While the excavation part 21 is driven to rotate, the buried pipe 11
Since there is a circumstance that the buried pipe is buried in a non-rotating state, a buried pipe connecting portion R for connecting the buried pipe 11 to the excavating portion 21 so as to be rotatable relative to each other is adopted.

The buried pipe connecting portion R is, specifically, from the maximum diameter portion of the first connecting portion E (that is, the enlarged diameter reamer main body portion 20), which is a mounting portion of the excavating blade 21A, to the tip side. A large-diameter tubular portion 24 extending in the axial direction and a small-diameter tubular portion 18 having a diameter smaller than that of the large-diameter tubular portion 24 are relatively rotatably connected via a bearing 37. ing.

At the buried pipe connecting portion R, a cylindrical guide G for guiding the excavated soil to one end of the discharge pipe 17.
Is also provided. Specifically, the tubular guide G is
A first conical cylindrical guide G1 mounted on the base end of the large-diameter cylindrical portion 24 so as to project in the inner diameter direction and the distal end direction thereof and rotating together with the excavating portion 21 and the like, and the small-diameter cylindrical portion 18 And a second conical tubular guide G2 that is attached to the base end portion of the base pipe in a state of protruding in the outer diameter direction and the base end direction and maintains a non-rotating state like the embedded pipe 11 and the like. Due to the mutual gap between the first conical cylindrical guide G1 and the second conical cylindrical guide G2, the embedded pipe 11 and the discharge pipe 17 connected to the enlarged reamer 15 via the embedded pipe connecting portion R are formed. A detour portion of the detour air flow path H is configured so as to detour after passing through the space K between them and reach the inside of the one end portion of the discharge pipe 17.

Further, the large-diameter cylindrical portion 24 is provided with a communication port 24a for forming a flow passage in the bypass air flow passage H immediately before the bypass portion. The presence of the tubular guide G prevents the excavated soil from the expansion reamer 15 from being directly guided to the communication port 24a.

At an appropriate position of the bypass air flow path H, more specifically, in the space K between the buried pipe 11 and the discharge pipe 17 corresponding to the position immediately before the bypass portion, toward the tubular guide G. A fluid ejecting nozzle 25 is arranged to eject a fluid for removing the excavated soil accumulated there. Accordingly, the fluid ejected from the fluid ejecting nozzle 25 toward the tubular guide G blows away the excavated soil, which tends to stay in the gap of the installation portion of the tubular guide G.

A suction device 19 for sucking the excavated soil and the like is connected to the end portion of the discharge pipe 17 on the tip side as shown in FIG. At the base end side of the suction device 19, a recovery tank 34 for recovering the gas-liquid mixed phase fluid 45 and the like, a solid-liquid separation device 35 and the like are adjacently arranged. The solid-liquid separator 35 precipitates mud or the like as a solid to separate it from the liquid, and the liquid such as lubricant separated by the solid-liquid separator 35 is returned by the return hose P to the propulsion unit. It is fed to the unit winding drum 6 side and is again jetted from the gas-liquid jet nozzle 33.

Next, another embodiment will be described. As the buried pipe 11, a pipe other than the corrugated pipe in the above-mentioned embodiment may be adopted.

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

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an underground retractor according to the present invention.

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

FIG. 3 is a vertical cross-sectional view showing the underground pull-in facility together with a propulsion device.

[Explanation of symbols]

 4 Propulsion pipe 11 Buried pipe 15 Expanded reamer 17 Discharge pipe 19 Suction device 25 Fluid ejection nozzle 50 Underground hole G Cylindrical guide H Detour air flow passage K Void R Buried pipe connection

Claims (1)

[Claims] 1. A propulsion pipe (4), which is propelled while excavating an underground hole (50) and is inserted into the ground, is detachably attached to the tip end of the propulsion pipe (4), An expansion reamer (15) for expanding the diameter of the underground hole (50) at the time of pulling back, and the underground hole (50) for the expansion reamer (15).
The buried pipe (1) that is buried in the propulsion pipe (4) in turn
1) The buried pipe connecting portion (R) for rotatably connecting to each other, and the excavated soil generated by the operation of the expansion reamer (15), which is inserted through the buried pipe (11) and is disposed at the other end. A discharge pipe (17) for sucking and discharging from one end by a suction force of a suction device (19) connected to the portion, and to the expansion reamer (15) via the embedded pipe connecting portion (R). The buried pipe (11) and the discharge pipe (1) connected to each other.
An underground pipe retraction device for a buried pipe, wherein a bypass air flow path (H) is formed, which bypasses a gap (K) between the discharge pipe (7) and the discharge pipe (17) and reaches one end of the discharge pipe (17). The embedded pipe connecting portion (R) is provided with a tubular guide (G) for guiding the excavated soil to one end of the exhaust pipe (17), and a fluid is directed toward the tubular guide (G). An underground pipe retraction device for a buried pipe, in which a fluid ejection nozzle (25) for ejecting water is disposed in the gap (K).