JPH05295985A - Excavated bore expanding method - Google Patents

Abstract

PURPOSE:To promote the diametral expansion of an excavated bore and improve the economical efficiency. CONSTITUTION:An excavating head is set up at the tip side of a digging pipe body 3A, while a propulsive unit 5 consisting of a digging pipe 3 made up of being installed rotatively drivable around the shaft center and a propulsive pipe 4 succeeding to this digging pipe 3 is used for the digging pipe body 3A of the excavating head via a rotative driving shaft 14 in the digging pipe body 3A. After an excavated bore is formed in maling the excavating head drive forward in the ground as rotating it, an expanding reamer 15 is connected to the rotative driving shaft 14 in a state of inserting the propulsive unit 5 into the ground intact. In succession, the expanding reamer 15 is pulled back via the propulse pipe 4 as rotating and driving the reamer 15 via the rotative driving shaft 14, rhus an inner surface of the excavated bore is cut and diametrally expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a propulsion unit composed of a drill pipe having a drill head provided on the tip side of a drill pipe body and a propulsion pipe subsequent to the drill pipe. The present invention relates to a drilling hole diameter expanding method for expanding the diameter of a drilling hole formed by propelling the inside of the ground while rotating the drilling pipe to a size into which a buried pipe can be inserted.

[0002]

2. Description of the Related Art Conventionally, as a method for expanding the diameter of the above-mentioned drill hole,
Using a propulsion unit composed of the excavation head in which the excavation head is attached to the excavation pipe main body so that it cannot rotate relative to the excavation pipe, and a plurality of propulsion pipes that follow the excavation pipe so that they cannot rotate relative to each other. The propulsion pipe is driven to rotate around the axis outside the underground hole, and the excavation head of the excavation pipe is rotated integrally with the propulsion pipe to propel the inside of the ground to form the excavation hole, and then the propulsion unit is grounded. With it inserted inside,
The excavation head is removed from the excavation pipe main body, and the expansion reamer is connected to the excavation pipe main body such that the expansion reamer cannot rotate relative to the excavation pipe main body, and the proximal end side propulsion pipe is rotationally driven around the axis outside the underground hole to enlarge. There has been a method in which the reamer is integrally rotated with all the propulsion pipes in the underground hole, and the expansion reamer is pulled back through the propulsion pipe to excavate the inner surface of the excavation hole to expand the diameter.

[0003]

However, according to the above method, when excavating by rotating the excavation head or the expansion reamer, the propulsion pipe on the proximal end side of the propulsion unit is provided around the axis outside the underground hole. Since all of the propulsion pipes in the underground hole had to be rotated by rotating it, the rotational sliding contact resistance of the inner wall of the excavation hole with respect to the propulsion pipe and the excavation pipe increased, and the load during rotation drive was increased. Has a drawback that not only is it large and requires a large amount of power, but it is also difficult to increase the diameter of the drilled hole. The present invention eliminates the above-mentioned conventional drawbacks,
An object of the present invention is to provide a drilling hole diameter expanding method capable of reducing the load at the time of rotational driving and increasing the diameter of the drilling hole.

[0004]

In order to achieve the above object, a method for expanding a diameter of a drill hole according to the present invention is to arrange a drill head on the tip side of a drill pipe body and rotate the drill pipe body within the drill pipe body. Via the drive shaft, the excavation head in the excavation pipe main body, using a propulsion unit consisting of a propulsion pipe subsequent to the excavation pipe, the excavation pipe being rotatably provided around its axis, After forming the excavation hole by propelling the inside of the ground while rotating the excavation head, with the propulsion unit still inserted into the underground, connect the expansion reamer to the rotation drive shaft, and rotate the While rotationally driving the expansion reamer via a drive shaft, the expansion reamer is pulled back through the propulsion pipe to excavate the inner surface of the excavation hole to expand the diameter. is there.

[0005]

That is, the excavation head and the excavation pipe main body are relatively rotatable, and only the excavation head and the expansion reamer follow the excavation pipe main body and the excavation pipe via the rotary drive shaft in the excavation pipe main body. The excavation hole is formed while rotating it with respect to the propulsion pipe, and the diameter of the excavation hole is expanded, so the rotating part can be made much smaller than before, and the rotational sliding contact resistance received from the inner wall of the excavation hole can be reduced. Can be made smaller. As a result, the load at the time of rotary drive can be reduced, so a large hole can be excavated with a small amount of power, and
You can also save energy.

[0006]

As described above, since a large hole can be drilled with a small amount of power and energy can be saved, the diameter of the drilled hole can be increased, and the diameter of the drilled hole is also excellent in economy. Could be provided.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 4 shows an underground pipe drawing facility 1 for a buried pipe and a propulsion device 2 for a propulsion method.

In the propulsion device 2, an excavation pipe 3 equipped with an excavation head (not shown) for propelling in the soil between the first construction pit A and the second construction pit B, and the excavation pipe 3
A plurality of propulsion pipes 4 subsequent to the above are flexibly connected in advance via a joint (not shown) to form a propulsion unit 5. The propulsion unit 5 is located in the underground hole 50 formed by the excavation head, and from this state, the propulsion unit winding drum 6 installed outside the ground portion of the first construction pit A on the propulsion device 2 side. I take it.

At the bottom of the first construction pit A, a pressing mechanism 7 composed of a combination of a clamper 7a and a pressing cylinder 7b is installed. To the pressing mechanism 7, the propulsion unit 5 rewound from the propulsion unit winding drum 6 is
It is designed to be supplied via the guide roller 8. The pressing mechanism 7 connects the propulsion unit 5 to the clamper 7
By pushing forward the pushing cylinder 7b while clamping it at a, the pushing unit 5 is pushed forward, and by pushing the pushing cylinder 7b backward while releasing the clamper 7a, a new portion of the pushing unit 5 The clamp is prepared, and by repeating this, the pushing from the rear for propelling the propulsion unit 5 is performed. In addition, 9 is a support jack which supports the side wall of the construction pit A from the inside.

The second construction pit B on the side of the lead-in facility 1
A buried pipe winding drum 10 is installed outside the ground. A corrugated pipe 11 as an embedded pipe is wound around the embedded pipe winding drum 10.

A guide roller 12 is provided at the entrance of the second construction pit B, and the buried pipe winding drum 10 is provided.
The corrugated pipe 11 that is unwound from the inside is guided by the guide roller 12 into the second construction pit B. As will be described later, the corrugated pipe 11 is connected to the propulsion unit 5 side penetrating from the first construction pit A to the second construction pit B side via the underground retraction device 13 to reversely operate the pressing mechanism 7. By doing so, instead of the propulsion unit 5 being pulled out from the soil, it is drawn into the soil.

As shown in FIG. 1, a rotary drive shaft 14 that can be driven and rotated extends from the excavation pipe body 3A of the excavation pipe 3 at the tip of the propulsion unit 5, and the excavation head is attached to the drive shaft 14. A mounting part 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. The other end of the underground retractor 13 is connected to the corrugated pipe 11.

As shown in FIGS. 1 and 4, in the construction of the underground pulling device 13, an expansion reamer 15 for expanding the diameter of the underground hole 50 formed by the excavation head, excavation soil 16 and A discharge pipe 17 for discharging the lubricant used during excavation is connected to both ends of the buried pipe connector 18, and one end of the discharge pipe 17 sucks the excavated soil 16 and the lubricant. A suction device 19 for connecting is connected.

As shown in FIGS. 1 and 2, the enlarged reamer 15 is provided on the cylindrical reamer body 20 at four locations in the circumferential direction (that is, the circumferential direction of the underground hole 50) at equal intervals. Two
1 is provided.

The excavation portion 21 is provided so as to project in the radial direction of the reamer main body portion 20, and the tips of all the excavation portions 21 are welded and fixed to the inner surface of one ring 24 so that the strength of the excavation portion 21 is increased. It has been secured. In each excavation part 21, a plurality of excavation blades 21A are arranged in parallel in the radial direction (that is, the radial direction of the underground hole 50) at regular intervals.

The reamer body 20 has a fitting hole 22 for the drive shaft 14 and a mounting hole 23 for the drive shaft 14 formed through the reamer body 20.
One end of the outer peripheral portion is formed so as to be fitted inside the end of the excavation pipe 3.

Further, in a longitudinal direction of the underground hole 50 between the adjacent excavating portions 21, the excavating soil 16 and the discharging space 49 for discharging the lubricant used at the time of excavating are penetrated. Has been formed.

The discharge pipe 17 can be inserted into the corrugated pipe 11.

The buried pipe connector 18 is a corrugated pipe 11
A shaft 25 that is insertable into the inside of the corrugated tube 11 and is formed so as to have a certain space between the inner wall of the corrugated tube 11 and the drive shaft 14, and a ring-shaped connector body 26. A bracket 27 for attaching the discharge pipe 17 and three locking metal fittings 28 that lock the corrugated pipe 11 at three circumferential positions thereof.

Both ends of the shaft 25 are formed to have a small diameter, and the first and second male screw portions 29, 29 are formed in the small diameter portion, respectively.
30 is formed. In addition, the connector body 26,
A shaft insertion hole 31 and a bearing fitting hole 32 are formed so as to penetrate along the axis. Then, the small-diameter portion on one side of the shaft 25 is inserted from the shaft insertion hole 31 side to the bearing fitting hole 32, and the bearing 33 is fitted in the bearing fitting hole 32 in the state where the bearing 33 is fitted in the bearing fitting hole 32. Is externally fitted, and the bearing fixing nut 34 is screwed into the first male screw portion 29 protruding from the bearing 33, so that the shaft 25 is attached to the connector main body 26 so as to be relatively rotatable in the axial direction thereof.

The bracket 27 is formed by welding and fixing a pipe 36 to a disc 35 for attachment to the connector body 26, and the peripheral wall of the pipe 36 has three locations in the circumferential direction.
An opening 37 for communicating the space inside and outside the pipe 36 is formed large. The bracket 27 is bolted to the connector body 26 via a ring-shaped bearing retainer 38.

As shown in FIGS. 1 and 3, the locking metal fitting 2 is provided.
Reference numeral 8 is formed in an arc shape and is bolted to the connector body 26. The arc-shaped portion is 1 of the corrugated pipe 11.
It is formed so that it can be locked in the / 4 circle. In addition, the mounting hole 39 for mounting to the connector main body 26 is formed as a long hole in the radial direction of the disc 35, and after inserting into the corrugated pipe 1, the locking metal fitting 28 is projected and moved in the radial direction, The corrugated tube 11 can be locked to the convex portion on the inner surface.

The underground pulling device 13 is connected to the propulsion unit 5 and the corrugated pipe 11 as follows.

That is, the enlarged reamer body 20 is connected to the drive shaft 1
4, while fitting the outer peripheral portion of the main body portion 20 into the end portion of the excavation pipe 3, the second male screw portion 30 of the shaft 25 is screwed to the female screw portion 40 formed on the drive shaft 14. The expansion reamer 15 is pressed at the step portion of the shaft 25 to be connected to the propulsion unit 5 side, while the connecting tool 1
8 is inserted into the corrugated tube 11, and the locking metal fitting 28 is locked to the inner convex portion of the corrugated tube 11,
It is connected to 1.

The shaft 25 has a second male screw portion 3
The third male screw portion 41 is formed in the large diameter portion so as to be adjacent to 0, and the nut 42 is screwed onto the third male screw portion 41 to abut against the reamer body portion 20. The pin 43 is locked over 20 so that the expansion reamer 15 and the shaft 25 rotate integrally.

Further, a flow path 51 of a lubricant used for excavation is formed from the drive shaft 14 to the shaft 25 so that the lubricant is sprayed from the outer peripheral portion of the shaft 25 toward the blade portion 21 of the expansion reamer 15. I am doing it.

A cover 44 for fitting the discharge pipe 17 into the bracket 27 and for partitioning the space formed between the connector 18 and the inner wall of the corrugated pipe 11 from the space on the inner side of the corrugated pipe. Is externally fitted and bolted integrally with the discharge pipe 17. In this state, the space expanded by the expansion reamer 15 communicates with the space inside the discharge pipe 17 through the opening 37 of the bracket 27. A suction device 19 is connected to the other end of the discharge pipe 17.

After connecting as described above, the propulsion unit 5 is pulled out from the soil while driving the drive shaft 14 to rotate the expansion reamer 15, and at the same time, when the suction device 19 is operated, the excavated soil is discharged. 16 and the lubricant enter the end portion of the corrugated pipe 11, pass between the locking metal fittings 28, are guided into the discharge pipe 17 through the opening 37, and pass through the discharge pipe 17 to the outside of the ground. Is discharged.

[Other Embodiments] The buried pipe 11 may be a pipe other than a corrugated pipe. The expansion reamer is not limited to the one in which the blade portions 21 are provided radially as in the above-described embodiment, but may be, for example, a conical expansion reamer main body portion with the excavation portion 21 formed in a spiral shape. ..

It should be noted that reference numerals are added to 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 sectional view of an underground pipe retraction device for a buried pipe.

[Fig. 2] Front view of an enlarged reamer

FIG. 3 is a view showing a mounting state of a locking metal fitting.

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

[Explanation of symbols]

 3 Excavation pipe 3A Excavation pipe main body 4 Propulsion pipe 5 Propulsion unit 14 Rotation drive shaft 15 Expansion reamer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukishige Yamada 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd.

Claims (1)

[Claims] 1. An excavation head is arranged on the tip side of the excavation pipe body (3A), and the excavation head is moved to the excavation pipe body (1) via a rotary drive shaft (14) in the excavation pipe body (3A). 3A) using a propulsion unit (5) comprising an excavation pipe (3) rotatably driven around its axis and a propulsion pipe (4) following the excavation pipe (3),
After the excavation head is rotated to propel the inside of the ground to form an excavation hole, the rotary drive shaft (14) is expanded to the rotary drive shaft (14) with the propulsion unit (5) being inserted into the underground. (15) are connected to each other, and while the enlarged reamer (15) is rotationally driven through the rotational drive shaft (14),
A drilling hole diameter expanding method for pulling back the expansion reamer (15) via the propulsion pipe (4) to excavate and expand the diameter of the inner surface of the drilling hole.