JP2545160Y2 - Expanded reamer for underground holes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged reamer for an underground hole, and more particularly, to a detachable mounting at the tip end of a propulsion pipe inserted into the ground while excavating an underground hole. The present invention relates to an enlarged reamer used for expanding a diameter of an underground hole formed by a propulsion pipe when the buried pipe is retracted underground.

[0002]

2. Description of the Related Art In a conventional enlarged reamer, an enlarged reamer main body is detachably connected to a distal end portion of the propelled tube after the insertion so that the extruded reamer can be replaced with a propulsion head.
A buried pipe is connected to the enlarged reamer body via a buried pipe connecting part so as to be relatively rotatable. And the excavating blade for excavating and expanding the underground hole is integrally provided on the enlarged reamer body at a plurality of positions in the circumferential direction and at the set radially fixed positions.

[0003]

Meanwhile, the site where the underground hole is excavated and expanded by the expanding reamer is apt to be deformed after excavation so that earth and sand approach and move around the pipe. The buried pipe placed in the excavation part may be composed of viscous soil that deformed soil is strongly tightened from the outside, and even after excavation, deformation such that soil and sand approach and move around the pipe In some cases, it was composed of hard soil that did not occur. Then, for example, the radial position of the excavating blade integrated with the enlarged reamer main body portion is set in advance in a state suitable for excavating the site made of clayey soil (that is, the underground hole). When the clearance between the buried pipe and the buried pipe is set to be large to reduce the tightening force of the earth and sand), the expanded reamer whose excavation diameter is set for the viscous soil is used as it is. However, excavating a site of hard soil may cause inconvenience such as collapse of the earth and sand above the buried pipe. On the other hand, the radial position of the excavating blade integrally provided with the enlarged reamer main body is set in advance in a state suitable for excavating the site made of hard soil (that is, the underground hole and the buried pipe). When the excavation diameter is set so that the clearance with the soil becomes small), when the site of the clayey soil is excavated using the expanded reamer set for the hard soil as it is, In some cases, the tightening force was so strong that it was difficult to pull in the buried pipe. Therefore, even if the radial fixing position of the excavating blade with respect to the enlarged reamer main body portion is set to any of the above-described conditions, it is possible to perform excavating and expanding suitable for the site of clayey soil and the site of hard soil. In order to avoid the sacrifices of excavation work on any soil site, prepare multiple enlarged reamers with different excavation diameters in spite of the cost. There was a problem that it was necessary. The present invention has been made in view of such a situation, and has as its object to provide means capable of solving the above-described problems.

[0004]

The feature of the enlarged reamer for underground holes according to the present invention is that it is propelled while excavating an underground hole and attached to and detached from the tip of a propulsion pipe after being inserted into the ground. An embedment for providing an enlarged reamer main body portion that is freely connected, and allowing the embedment tube buried in the underground hole to be relatively rotatably connected to the enlarged reamer main body portion by being driven by pulling back of the propulsion tube after the insertion. A pipe connecting portion is provided, and a plurality of excavating blades for expanding the underground hole are arranged in a circumferential direction, and the excavating blades can be slidably adjusted in the radial direction with respect to the enlarged reamer body. There is a point attached to.

[0005]

In the enlarged reamer having such a configuration, the excavating blade is attached to the enlarged reamer body so as to be able to slide and adjust in the radial direction. The mounting position of the digging blade can be appropriately changed in the radial direction.

[0006]

Therefore, when performing construction on a site composed of clayey soil, the mounting position of the excavating blade is set to be radially outward based on the slide movement adjustment, so that the underground hole can be removed. So that the clearance with the buried pipe is large,
Even if the excavated earth and sand is deformed so as to approach and move around the pipe, the tightening force of the earth and sand against the buried pipe can be reduced by the clearance so that the buried pipe can be substantially retracted. Become. On the other hand, in the case of performing construction on the site composed of hard soil, the clearance between the underground hole and the buried pipe is reduced by setting the mounting position of the excavating blade to be inward in the radial direction based on the slide movement adjustment. By reducing the size, it is possible to eliminate the possibility that the earth and sand above the buried pipe may collapse. Therefore, only by preparing one enlarged reamer, it is possible to perform a work that can cope with the site of the clayey soil and the site of the hard soil by the adjustment, and the conventional problem can be solved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a buried pipe drawing-in facility 1 partially provided with an enlarged reamer 15 according to the present invention, together with a propulsion device 2 for a propulsion method.

In the propulsion device 2 for the propulsion method, a propulsion direction from the first construction pit A to the second construction pit B (hereinafter, a near side of the propulsion direction is referred to as a base end side, and the opposite side is a front end side. A drilling pipe 3 provided with a drilling head (not shown) for drilling and forming an underground hole 50 (see FIG. 1) at the tip thereof, and a plurality of propulsion pipes 4 following the drilling pipe 3 are connected to a joint section (see FIG. 1). A propulsion unit 5 that is flexibly connected via an outside)
The main part is constituted by the propulsion unit 5
Is configured to be pressed from behind by the pressing mechanism 7 in the underground hole 50 and propelled in the propulsion 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. A propulsion unit winding drum 6 that winds and stores the propulsion unit 5 is provided outside the ground portion of the first construction pit A.

The propulsion unit 5 unwound from the propulsion unit winding drum 6 is supplied to the pressing mechanism 7 via a guide roller 8, and the pressing mechanism 7 includes a propulsion unit. The propulsion unit 5 is advanced by advancing the pressing cylinder 7b to the distal end side while clamping the 5 with the clamper 7a, and the backward moving operation of the pressing cylinder 7b to the proximal end side with the clamper 7a released. By preparing the clamping of a new part of the propulsion unit 5 by pressing, the propulsion unit 5 is pressed from the rear by repeating these operations, and the pressing is performed according to the excavation formation of the underground hole 50, The propulsion unit 5 is propelled in the propulsion direction.
In addition, 9 in the figure is a support jack for supporting the side wall of the construction pit A from the inside.

A buried pipe winding drum 10 is provided outside the ground of the second construction pit B. The buried pipe winding drum 10 has a buried pipe 11 (specifically, a corrugated pipe). Is retracted 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 into the second construction pit B. B is guided inside.

The buried pipe 11 is provided in the first construction pit A
To the propulsion unit 5 side which is propelled from the second construction pit B and penetrates to the second construction pit B (more specifically, to the enlarged reamer main body 20 (see FIG. 1) which is detachably connected to the tip of the drilling pipe 3 ) The connection is made via a buried pipe connection portion R. Then, the buried pipe 11 is pulled out from the soil to the base end side by the reverse operation of the pressing mechanism 7 while maintaining the connected state, and the propulsion unit 5 is wound again on the propulsion unit winding drum 6. Instead of being drawn into the ground.

A part of the buried pipe drop-in facility 1,
The enlarged reamer 15 according to the present invention will be described in detail with reference to FIGS.

The enlarging reamer 15 is provided with an excavating blade 2 for enlarging the underground hole 50 when the buried pipe 11 is drawn into the soil.
An enlarged reamer main body 20 for attaching with the bolts 13 in a state where a plurality of (1 in this embodiment) are radially arranged in the circumferential direction is provided as a main part.

More specifically, the excavating blade 21 has a main body formed of a rectangular parallelepiped tip, and a blade for enlarging the diameter is formed on one plane of the main body. The orientation is such that the direction is along the radial direction, and the formation surface of the blade is oriented toward the base end side of the propulsion unit 5 so that the blade can be attached to the enlarged reamer main body 20 using the bolt 13. It has become.

The bolt 13 is inserted into a bolt insertion hole 21 a provided in the center of the excavating blade 21, and its tip is screwed into a female screw hole formed in the enlarged reamer body 20. Have been.

The enlarged reamer body 20 is adapted to move the propulsion head (the propulsion head) against a drive rotatable drive shaft 14 extending from the excavation pipe 3 at the tip of the propulsion unit 5 to the removed portion of the propulsion head. Is detached in FIG. 1) so as to be replaceable.

The portion where the excavating blade 21 is attached to the enlarged reamer main body 20 includes the following:
It is configured so that it can be attached so that it can be slidably adjusted in the radial direction. Specifically, the digging blade 21
The bolt insertion hole 21a provided in the hole is formed in a long hole shape, and the bolt 13 in the long hole bolt insertion hole 21a is formed.
The slide movement adjustment is performed by changing the insertion position. Therefore, the mounting position of the excavating blade 21 with respect to the enlarged reamer main body 20 can be appropriately changed in the radial direction based on the slide movement adjustment.

At the base end of the enlarged reamer 15, a gas-liquid multi-phase fluid 45 containing a lubricant and water is applied.
Is provided along the axial direction of the propulsion pipe 4.

The structure of the buried pipe drop-in facility 1 will be further described. The buried pipe drawing-in facility 1 has a discharge pipe 17 for discharging excavated earth 16 and the like, in addition to the enlarged reamer 15 provided for expanding the diameter of the underground hole 50 formed by the excavation head. As shown in FIG. 1, the buried pipe connecting portion R is provided so as to be connected to a distal end portion (a base end portion thereof is connected to the enlarged reamer body 20).

A suction device 19 for sucking the excavated soil 16 and the like is connected to the end of the discharge pipe 17 on the distal end side as shown in FIG. A collection tank 34 for collecting the gas-liquid multiphase fluid 45 and the like, a solid-liquid separation device 35 and the like are arranged adjacent to the base end side of the suction device 19. The solid-liquid separator 35 precipitates mud or the like as a solid and separates the solid from the liquid. The liquid such as the sliding material separated by the solid-liquid separator 35 is returned by the return hose P to the propulsion. It is fed to the unit winding drum 6 side and is ejected from the gas-liquid ejection nozzle 33 again.

The buried pipe connecting portion R will be further described with reference to FIG. The buried pipe connection portion R is driven by the enlarged reamer 15 and integrally rotates with the base end portion 24;
The enlarged reamer 15 is linked to the buried pipe 11 and is configured by a combination with a distal end portion 18 which is not driven to rotate.

The proximal end portion 24 includes an enlarged reamer-side cylindrical body 41 connected to an outer peripheral portion of the enlarged reamer main body 20.
And a connector mounting portion 29 for mounting the connector main body 26 via a bearing 37 so as to be relatively rotatable. Note that the excavated earth 16 and the like existing between the inner wall of the underground hole 50 and the buried pipe 11 are sucked into the connecting fixture mounting portion 29 and are sent to the distal end side in a detour manner. Slot-shaped suction port 29a is provided.

The distal end portion 18 is bolted and integrated with a discharge pipe locking portion 36 for locking the base end of the discharge pipe 17 inserted into the buried pipe 11 from the inside. The main body 26 is constituted by the connector main body 26 to be manufactured.

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

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of an enlarged reamer according to the present invention.

FIG. 2 is a front view of the enlarged reamer.

FIG. 3 is a longitudinal sectional side view showing a buried pipe drawing facility provided with the enlarged reamer and a propulsion device.

[Explanation of symbols]

 4 Propulsion pipe 11 Buried pipe 20 Enlarged reamer body 21 Drilling blade 50 Underground hole R Buried pipe connection

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshinori Kawabata 1-1-1 Hama, Amagasaki-shi, Hyogo Pref.

Claims (1)

(57) [Scope of request for utility model registration] 1. An enlarged reamer body (20) detachably connected to a distal end of a propulsion pipe (4) after being propelled while excavating an underground hole (50) and inserted into the ground. A buried pipe (11) buried in the underground hole (50) is relatively rotatably connected to the enlarged reamer main body part (20) by being driven by the retraction of the propulsion pipe (4) after the insertion. And the underground hole (50) is provided.
A plurality of digging blades (21) for increasing the diameter of the reamer are provided in the circumferential direction, and the digging blade (2) is
1) Enlarged reamers for underground holes, each of which is mounted so that it can slide and adjust in the radial direction.