JP2555225Y2 - Underground retracting device for buried pipe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which a propulsion pipe inserted into the ground while excavating is mounted between a propulsion pipe and a buried pipe connected to a tip side of the propulsion pipe, and the propulsion pipe is pulled back. When burying the buried pipe in the underground, an enlarged reamer is provided for expanding the diameter while excavating the inner surface of the underground hole, and a locking portion for locking to the buried pipe is provided; The present invention relates to a device for retracting a buried pipe underground provided with a buried pipe connector for connecting the reamer and the enlarged reamer.

[0002]

2. Description of the Related Art Conventionally, in the underground retracting device for buried pipes described above, an enlarged reamer is formed so that a diameter of a reamer body is reduced toward a propulsion pipe, and a digging blade is spirally formed on the reamer body. It was formed and configured. And when pulling back the propulsion tube, rotate the reamer body around its axis,
Excavation was performed while pushing the soil around the excavation blade, and the excavated soil and the sliding material used during excavation were discharged out 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 excavation was performed while pushing the soil around the excavation blade, so that the excavated earth was excavated between the inner wall of the excavation hole and the reamer body. There is a drawback that the reamer body is easily clogged, and the earth pressure largely acts on the reamer main body, thereby increasing the excavation resistance. In addition, excavation excavation and lubrication materials used during excavation
Because the pipe was discharged out of the ground through the space between the outer peripheral surface of the buried pipe and the inner wall of the pit, the diameter of the pit is smaller than the diameter of the buried pipe so that the excavated soil can be discharged smoothly. Must be formed rather large, if so formed,
There was a large space 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. As a solution to the above-mentioned drawbacks, a plurality of excavating blades are provided in an enlarged reamer with a plurality of excavating blades arranged side by side in a radial direction of the underground hole, and the excavating portions are dispersed in a circumferential direction of the underground hole. A discharge space for arranging and discharging the excavated soil and the sliding material used during excavation is formed in a state penetrating in the longitudinal direction of the underground hole between the excavated portions adjacent to each other; A pipe portion for attaching a buried pipe connecting member is connected to an outer peripheral portion of the pipe, and a discharge pipe which can be inserted into the buried pipe and discharges the sliding material and the excavated earth is provided. In a state of being inserted into the pipe, one end of the discharge pipe is fitted and connected to the buried pipe connector so as to communicate with the space expanded by the enlarged reamer, and is connected to the buried pipe connector mounting cylinder. A rotation mechanism for connecting the discharge pipe to the discharge pipe so as to be relatively rotatable is embedded. A buried pipe, which is provided between a pipe connector mounting tube portion and the discharge pipe, and to which the other end of the discharge pipe is connected with a suction device for suctioning the sliding material and the excavated soil. Underground retraction devices have been proposed. According to this configuration,
Since the excavated earth and the lubricating material pass through the discharge space between the excavated parts and are discharged to the rear, it is possible to prevent mud clogging between the inner wall of the excavated hole and the reamer main body part, and the excavated part is exposed to the excavated part Since the earth pressure can be reduced, and the excavated earth and the sliding material are discharged through the discharge pipe inserted through the buried pipe and out of the underground hole while being suctioned by the suction device, after burying the buried pipe in the ground, In addition, it is difficult to form a space between the outer peripheral surface of the buried pipe and the inner wall of the underground hole, and unique effects such as prevention of land subsidence after construction can be obtained. However, since vinyl hoses and the like used as the discharge pipe are generally manufactured on the basis of the inner diameter and the outer diameter varies, as described above, one end of the discharge pipe is externally fitted to the buried pipe connector and connected. The outer diameter of the discharge pipe is too small compared to the inner diameter of the buried pipe connector, making it difficult to fit one end of the discharge pipe to the buried pipe connector, or conversely, the outer diameter of the discharge pipe. Is too large, a large gap is formed between one end of the discharge pipe and the buried pipe connector, and air may leak therefrom during suction. The present invention has been made in view of the above points, and it is possible to efficiently expand the diameter of the inner surface of an underground hole and prevent the risk of ground subsidence after construction, but also to bury one end of the discharge pipe with a buried pipe. It can be smoothly connected to the connecting tool, and
It is an object of the present invention to provide an underground retracting device for a buried pipe in which air is less likely to leak from the connecting portion.

[0004]

In order to achieve the above object, an underground retracting device for a buried pipe according to the present invention comprises a plurality of excavating blades arranged side by side in the radial direction of the underground hole. Parts are provided in the enlarged reamer, and the excavated parts are arranged in the circumferential direction of the underground hole in a dispersed manner, and discharge spaces for discharging excavated earth and a sliding material used during excavation are adjacent to each other. Formed in a state penetrating in the longitudinal direction of the underground hole between the excavated portions, connecting a buried pipe connector mounting tube portion to an outer peripheral portion of the enlarged reamer, and forming the buried pipe connector, A first tubular portion connectable to the buried pipe coupling mounting tubular portion, and the other end of a discharge pipe for sucking and discharging the sliding material and excavated soil by a suction device connected to one end; Was expanded by the expanding reamer while being inserted into the buried pipe. One end is provided with a connection portion for a discharge pipe which is externally connected so as to communicate with the space, and the other end portion is provided with a second cylindrical portion provided with a fitting connection portion which is fitted and connected to the first cylindrical portion. A rotating mechanism for relatively rotatably connecting the buried pipe connector mounting cylinder portion and the discharge pipe is provided between the buried pipe connector mounting cylinder portion and the discharge pipe connection portion. The operation and effect are as follows.

[0005]

That is, since the enlarged reamer is configured as described above, the excavated earth and the sliding material are smoothly discharged rearward through the discharge space between the excavated parts during the excavation. Therefore, it is possible to prevent mud clogging between the inner wall of the excavation hole and the reamer body, and to prevent an increase in earth pressure around the excavated portion due to the mud clogging. In addition, since a tube portion for mounting a buried pipe connector is continuously provided on the outer peripheral portion of the enlarged reamer, and a rotation mechanism is provided for connecting the tube portion for mounting the buried pipe connector and the discharge pipe so as to be relatively rotatable. When excavation is performed by rotating the enlarged reamer relative to the discharge pipe, most of the sliding materials and excavated soil are guided into the discharge pipe by the tubular portion, and are caused by mud clogging on the outer peripheral side of the buried pipe. An increase in the pull-in resistance of the buried pipe can be prevented. As a result, by synergistically reducing the earth pressure around the excavated portion and preventing an increase in the resistance of the buried pipe from being drawn in, the inner surface of the underground hole can be efficiently expanded. Furthermore, a discharge pipe for discharging the sliding material and the excavated soil is inserted into the buried pipe, and the space expanded by the enlarged reamer and the space in the discharge pipe are communicated with each other, so that the sliding material and the excavated soil are discharged. Since the discharge to the outside of the underground hole is performed while sucking 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 reduced, and after the buried pipe is buried in the ground In addition, the space between the outer peripheral surface of the buried pipe and the inner wall of the underground hole is reduced, so that land subsidence after construction can be prevented. And when configuring the buried pipe connector as described above and connecting the buried pipe connector to the discharge pipe,
Since the discharge pipe is externally fitted to the second tubular portion of the buried pipe connector, the second dimension is set to the specified size of the inner diameter of the discharge pipe.
By setting the dimensions of the outer diameter of the cylindrical portion, dimensions that match the fitting tolerance can be determined.In this case, as described above, since the vinyl hose or the like as the discharge pipe is often manufactured based on the inner diameter, The dimensions of the inner diameter of the discharge pipe hardly vary, and a desired fitting tolerance can be obtained.
As a result, as long as there is no large manufacturing error in the outer diameter of the second cylindrical portion, the two can be smoothly fitted together, and air can be prevented from leaking from the fitted portion during suction. Further, as described above, a first tubular portion capable of connecting the buried pipe connector to the tubular portion for mounting the buried pipe connector, and a fitting connection portion fitted and connected to the first tubular portion at one end. A discharge pipe connecting part for externally connecting the end of the discharge pipe to the other end.
When the discharge pipe is inserted into the buried pipe, for example, only the second cylindrical section is connected to the discharge pipe in advance, and a wire or the like (this wire or the like) is connected to the second cylindrical section. Is inserted into the buried pipe), and a wire or the like is pulled to insert the discharge pipe into the buried pipe. If such an insertion method is adopted, the second
When the wire is pulled by connecting the wire and the like to the second tubular portion when the wire is directly connected to the end of the discharge tube by connecting the wire to the second tubular portion. When a soft resin hose such as a vinyl hose is used as the discharge pipe, damage can be prevented. As a result, damage to the vinyl hose and the like can be prevented, so that there is no need to cut off the damaged portion of the discharge pipe, etc. In addition, the second tubular portion is directly connected to the first tubular portion, thereby expanding the buried pipe connector. The connection to the reamer side can also be completed, and as a whole, the connection operation can be performed very easily.

[0006]

[Effects of the Invention] Therefore, it is possible to efficiently connect the one end of the discharge pipe to the buried pipe connector, while efficiently expanding the inner surface of the underground hole and preventing the danger of land subsidence after construction. Thus, an underground retracting device for a buried pipe that does not easily leak air from the connecting portion can be provided.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 7 shows an underground drawing-in facility 1 for buried pipes installed on the second construction pit B side and a propulsion device 2 for a propulsion method installed on the first construction pit A side.

The underground drawing-in facility 1 is a facility for winding and holding a buried pipe, and is constructed by installing a buried pipe winding drum 10 outside the above-ground portion of the second construction pit B. The corrugated pipe 11 as a buried pipe is wound around the buried pipe winding drum 10. The propulsion device 2,
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 expanding the diameter while retracting the underground hole to draw the corrugated pipe 11 into the ground. A propulsion unit 5 for propelling the ground to form an underground hole, a propulsion unit winding drum 6 installed outside the ground portion of the first construction pit A, and an underground while pressing the propulsion unit 5 , Or a pressing mechanism 7 for pulling back from the ground. The propulsion unit 5 is capable of bending a drilling pipe 3 having a drilling head (not shown) at a tip thereof and a plurality of propulsion pipes 4 following the drilling pipe 3 via a joint (not shown). Are connected 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. The pressing mechanism 7 includes a propulsion unit winding drum 6.
The propulsion unit 5 is supplied via a guide roller 8. Then, the propulsion unit 5 is connected to the clamper 7.
By pushing the pressing cylinder 7b forward while clamping at a, the propulsion unit 5 is moved forward, and by pushing the pushing cylinder 7b backward while the clamper 7a is released, a new part of the propulsion unit 5 Preparation of the clamp is performed, and by repeating this, pressing from behind for propulsion of the propulsion unit 5 is performed. 9 is a support jack for supporting the side wall of the construction pit A from the inside. When the propulsion unit 5 is caused to move backward, the operation reverse to the above 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 by the guide roller 12 to a second position.
It is designed to be guided into the construction pit B. In FIG. 7, the corrugated pipe 11 is connected to the propulsion unit 5 penetrating from the first construction pit A to the second construction pit B via the underground retracting device 13, and the pressing mechanism 7 is operated in reverse, thereby The state where the corrugated pipe 11 is drawn and buried in the middle hole is shown.

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. It is provided. In this embodiment, the excavating head is detached, and one end of the underground retracting device 13 for the buried pipe is connected thereto.

The underground retracting device 13 is constructed as follows:
An expanding reamer 15 for expanding the diameter of the underground hole 50 formed by the excavating head and a discharge pipe 17 for discharging the excavated earth 16 and the like are connected to both ends of the buried pipe connector 18 respectively. A suction device 19 for sucking the excavated earth 16 and the like is connected to one end of the discharge pipe 17.

As shown in FIGS. 1 and 4, the enlarged reamer 15 has a cylindrical enlarged reamer main body 20 and an excavation section 21.
Are provided in four places in the circumferential direction (that is, in the circumferential direction of the underground hole 50). This enlarged reamer 15
The spline hole 22 into which the drive shaft 14 is fitted and the bolt insertion hole 23 for the fixing bolt are provided in the enlarged reamer body 20. Each said excavation part 21
Is provided with a plurality of excavating blades 21A which are arranged in a radial direction so as to form a cross shape, and are juxtaposed at regular intervals in the radial direction (that is, the radial direction of the underground hole 50). The space between the excavation parts 21 is a discharge space 49 for discharging the excavated earth 16 and the like along the longitudinal direction of the underground hole 50.

A tube portion 24 for attaching a buried pipe connector is continuously provided on the outer peripheral portion of the enlarged reamer 15. The tube portion 24 for mounting a buried pipe connector is provided with first and second axial directions.
Are divided into two, and the two divided cylinder portions 24A and 24B are provided with bolt connecting portions 51 for connecting them to each other. The first divided tubular portion 24A is formed of a cylindrical shape, and is fixed to the enlarged reamer 15. Further, the second divided cylindrical portion 24B is formed of a ring-shaped member, and a bearing retainer 31 having a cylindrical portion 41 provided at an end thereof.
Are bolted together. In the state where the bearing retainer 31 is bolted to the second divided cylindrical portion 24B,
As shown in FIG. 2, an elongated through-hole 32 is provided for introducing air from the outside into the space around the enlarged reamer 15. As shown in FIG. 2, a bolt insertion hole 51A is formed in a peripheral portion of the first divided cylindrical portion 24A to form the bolt connecting portion 51.
Are provided, and a female screw portion 51B is provided around the second divided tubular portion 24B. The two divided tubular portions 24A, 24B are bolted together by bolts 51C.

The excavating blade 21A of the enlarged reamer 15 includes:
A nozzle 33 provided along the axis of the propulsion pipe 4 is brought close to the nozzle 33, and a lubricant is blown from the nozzle 33 toward a discharge space 49 of the enlarged reamer 15.

The discharge pipe 17 is made of vinyl chloride and is inserted through the corrugated pipe 11. The suction device 19 includes:
This is a device that sucks the sliding material and the excavated earth 16 through the discharge pipe 17 and discharges them to the outside of the underground hole 50.

The buried pipe connector 18 is constituted by a first tubular portion 26A which can be freely connected to the buried pipe connector mounting tube portion 24.
At one end thereof, a fitting connecting portion 34 fitted and connected to the first cylindrical portion 26A, and a discharge pipe connecting portion 35 at the other end for externally connecting the end of the discharge pipe 17 to the outside. A second cylindrical portion 26B is provided, and at one end of the first cylindrical portion 26A,
A locking portion 36 for locking to the corrugated pipe 11 is provided.
The first cylindrical portion 26A is connected to the second divided cylindrical portion 24B via a bearing 37 (an example of a rotating mechanism) and a bearing retainer 31 in a state where one end thereof is fitted inside the second divided cylindrical portion 24B.
It is rotatably attached to the divided cylindrical portion 24B. The fitting connection portion 34 of the second cylindrical portion 26B is formed by forming bolt insertion holes 38 at four circumferential positions at one end of the second cylindrical portion 26B,
To connect the first tubular portion 26A and the second tubular portion 26B, a second
One end of the cylindrical portion 26B is gently fitted into one end of the first cylindrical portion 26A, and the circumferential direction 4 of the intermediate portion in the longitudinal direction of the first cylindrical portion 26A.
The connecting bolts 42 are screwed into and penetrated from the radial direction, and the distal ends of the bolts 42 are connected to the second cylindrical portion 26B.
Are inserted through the bolt insertion holes 38, respectively.

The discharge pipe connecting portion 35 has a reduced diameter portion 43 for externally fitting the end of the discharge pipe 17 to the second cylindrical portion 2.
6B is formed at the other end of the second cylindrical portion 26B.
And the discharge pipe 17, one end of the second cylindrical portion 26 </ b> B is fitted inside one end of the discharge pipe 17, and a bolt insertion hole 45 formed at four circumferential positions at the end of the discharge pipe 17 is provided. The connecting bolts 42 are inserted from the radial direction, and the distal ends of the bolts 42 are screwed and connected to the female screw portions 44 of the second cylindrical portion 26B, respectively.

The locking portion 36 includes a locking portion main body 40 externally fitted to the end of the first cylindrical portion 26A, and three locking portions 36 respectively locking the corrugated pipe 11 from the inside at three locations in the circumferential direction. And a locking metal fitting 28. First cylindrical portion 26A and locking portion main body 4
The locking part main body 40 and the locking metal fitting 28 are connected to each other by bolts. D in the figure is a dust seal.

As shown in FIG. 6, the locking metal fittings 28 are arc-shaped, each being 1/6 of the entire circumference of the corrugated pipe 11.
It is formed in such a size that it can be locked to an arc portion having a length corresponding to. The bolt insertion hole 39 for attaching to the locking portion main body 40 is formed in a long hole in the radial direction of the locking portion main body 40, and after the insertion into the corrugated tube 11, the locking fitting 28 is protruded and moved in the radial direction. In this way, the corrugated tube 11 can be engaged with the convex portion on the inner surface.

Reference numeral 52 in FIG. 1 denotes an eye bolt which can be attached to the end of the second cylindrical portion 26B. This eye bolt 52
Is used when the discharge pipe 17 is inserted into the corrugated pipe 11, and the method of insertion will be described with reference to FIG.
As shown in the figure, the second cylindrical portion 26B to which the eyebolt 52 is attached is connected to the end of the discharge pipe 17, and the corrugated pipe 1
1 is inserted into the eyebolt 52.
And the other end of the wire is pulled so that the discharge pipe 17 is inserted through the corrugated pipe 11. In addition, 30 in FIGS. 1 and 2 is a female screw portion for screwing a set screw for the eyebolt 52.

Between the enlarged reamer 15 and the first cylindrical portion 26A, the suction device 19 is operated to take in the air taken into the space around the enlarged reamer 15 and the lubricating material and the excavated earth 16 into a discharge pipe. Guide section 46 for guiding to 17 suction ports
Is provided. To form the guide portion 46, a tapered cylindrical first guide plate 4 having a smaller diameter on the outer peripheral portion of the excavation portion 21 from the outer peripheral portion toward the suction port of the discharge pipe 17.
6A, and a tapered cylindrical second guide plate 46B having a larger diameter as being closer to the enlarged reamer 15 from the opening of the first cylindrical portion 26A is provided at an end of the first cylindrical portion 26A. , The first guide plate 46A and the second guide plate 46B
The free ends are overlapped with each other in a state where they are separated in the thickness direction so that the air flow path R is formed therebetween. The enlarged reamer 15 has a pair of scrapers 47 attached to the inner surface of the second guide plate 46B. The first guide plate 46
A is integrated with the outer peripheral portion of the excavation portion 21, but the second guide plate 46B is separate from the first cylindrical portion 26A, and is connected to the tapered cylindrical body of the second guide plate 46B. The cylindrical portion is bolted to the first cylindrical portion 26A with the provided cylindrical portion being fitted inside the first cylindrical portion 26A.

In the above configuration, the propulsion unit 5 is pulled out of the soil while the drive shaft 14 is driven to rotate the enlarged reamer 15, and at the same time, the suction device 19 is driven.
When air is operated, air from the outside enters the through hole 32 of the ring-shaped member 30 through the space between the discharge pipe and the corrugated pipe 11, and is guided by the guide portion 46 together with the sliding material and the excavated soil 16. Then, it is sucked into the suction port of the discharge pipe 17 and discharged out of the underground hole.

In the range of the registration of the utility model, 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 cross-sectional view of a main part of an apparatus for retracting a buried pipe underground.

FIG. 2 is an exploded cross-sectional view of an underground retracting device for a buried pipe.

FIG. 3 is a diagram showing a method of retracting a discharge pipe.

4 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 5 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 6 is a view taken in the direction of arrows CC in FIG. 1;

FIG. 7 is an overall view of an underground retracting facility and a propulsion device.

[Explanation of symbols]

 Reference Signs List 4 propulsion pipe 11 buried pipe 15 enlarged reamer 16 excavated earth removal 17 discharge pipe 18 buried pipe coupling tool 19 suction device 21 excavation section 21A drilling blade 24 buried pipe coupling fixture mounting cylinder 26A first cylinder 26B second cylinder 34 Fitting connection part 35 Discharge pipe connection part 36 Locking part 37 Rotation mechanism 48 Expanded space 49 Drainage space 50 Underground hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazunori Tsujimoto 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Inside Kubota Technology Development Laboratory Co., Ltd. (72) Toshinori Kawabata 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd.

Claims (1)

(57) [Scope of request for utility model registration] 1. A propulsion pipe attached between a propulsion pipe (4) that is inserted into the ground while excavating, and a buried pipe (11) connected to a distal end side of the propulsion pipe (4). When the (4) is pulled back and the buried pipe (11) is buried in the ground, an enlarged reamer (15) for expanding the diameter while excavating the inner surface of the underground hole (50) is provided, and the buried pipe is provided. (11) a locking portion (36) for locking, and the buried pipe (11);
An underground pipe retraction device for a buried pipe provided with a buried pipe connector (18) for connecting the reamer and the enlarged reamer (15), wherein a plurality of excavating blades (21A) are connected to a diameter of the underground hole (50). The excavation part (21) juxtaposed in the direction
5), and the excavation part (21) is dispersedly arranged in the circumferential direction of the underground hole (50), and the excavation (1) is removed.
6) and a discharge space (49) for discharging the sliding material used during excavation are provided in the excavation section (21) adjacent to each other.
The underground hole (50) is formed in a state penetrating in a longitudinal direction of the underground hole (50), and a tube portion (24) for mounting a buried pipe connector is connected to an outer peripheral portion of the enlarged reamer (15). Tools (1
8), the tubular portion (2)
4) a first pipe portion (26A), which is freely connectable, provided with a discharge pipe (17) for suctioning and discharging the sliding material and excavated soil by a suction device (19) connected to one end thereof; With the other end inserted into the buried pipe (11), a discharge pipe connecting part (35) that is externally connected so as to communicate with the space (48) expanded by the expanding reamer (15) is provided. The second tubular part (2) provided at one end and having a fitting connection part (34) fitted and connected to the first tubular part (26A) at the other end.
6B), and the tube portion (24) for mounting the buried pipe connector.
A rotation mechanism (37) for connecting the discharge pipe (17) and the discharge pipe (17) so as to be rotatable relative to each other is provided by a tube part (2) for mounting a buried pipe connector.
4) An underground retraction device for a buried pipe provided between the discharge pipe connecting part (35) and the discharge pipe connecting part (35).