JP2533843Y2 - Connection device for buried pipes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of connecting an end of a buried pipe to a propelling body inserted into the ground while excavating, and pulling the propelling body back into the ground while pulling the propelling body back in that state. In the pipe burying method of inserting, the present invention relates to a connecting device of a burying pipe used for connecting the propulsion body and the pipe. A locking member that comes into contact with the inner surface of the pipe is provided in a state of being divided into a plurality in the circumferential direction of the inner surface, and the inner surface of the locking member is formed on a tapered inner surface portion having a smaller diameter toward one end. Formed, a tapered member having a tapered outer surface portion that can be fitted inside the tapered inner surface portion, with the large-diameter side protruding outward, provided on the coupling device body movably in the axial direction thereof,
The taper member is provided with a moving operation part for moving the taper member in the axial direction thereof, the locking member is externally fitted to the taper member, and they are inserted into one end of the pipe. The present invention relates to a connecting device for a buried pipe provided with a restricting portion in the connecting device main body, which restricts the locking member from approaching the connecting device main body in accordance with a movement operation to a side approaching the connecting device main body.

[0002]

2. Description of the Related Art Conventionally, in the above-described apparatus for connecting a buried pipe, an outer peripheral portion of a locking member is formed to be substantially smooth over the entire surface. Further, the locking member slidably fitted to the taper member is merely brought into contact with the side of the connecting device main body, and one side of the connecting device main body is connected to the locking member. For the time being, the above-mentioned limiting part was constituted. Further, the connecting device is configured to contact the buried pipe only with the locking member.

[0003]

However, according to the above structure, since the outer peripheral portion of the locking member is formed to be substantially smooth over the entire surface, for example, the inner surface such as a corrugated pipe becomes uneven. When this connecting device is used for a pipe, only a part of the outer peripheral surface of the locking member can be brought into contact with the inner surface of the pipe, and as a result, the propulsion body is pulled back. There was a drawback that the frictional force of the contact surface could not be sufficiently increased, and the locking member was easily detached from the pipe during the retraction. In addition, since the connecting device is brought into contact with the buried pipe only with the locking member, the end surface of the pipe is exposed when the connecting device is mounted on the pipe, and in this mounted state, As described above, only a part of the outer circumferential surface of the locking member is in contact with the inner surface of the pipe. There is a drawback that lubricating material and water easily enter the pipe. Further, the locking member has a side surface of the coupling device main body which is simply brought into contact with the coupling device main body, and the restricting portion is formed by using one side surface of the coupling device main body as a contact surface with the locking member. Therefore, the diameter of the locking member cannot be increased unless the moving operation unit is operated, and there is a disadvantage that the operation of the moving operation unit is troublesome. The present invention solves the above-mentioned drawbacks of the related art, and allows a locking member to be securely locked to a buried pipe when the pipe is inserted into the ground, and a lubricating material or water is contained in the pipe. It is an object of the present invention to provide a connecting device for a buried pipe, which is hard to penetrate and has good workability.

[0004]

In order to achieve the above-mentioned object, a connecting device for a buried pipe according to the present invention is provided with a projection on an outer peripheral portion of a locking member for locking on an inner surface of the pipe. A sealing mechanism for biasing the locking member toward the large diameter side of the tapered member at the restricting portion and applying a full end circumference of the pipe to seal between the coupling device body and the pipe; A part is provided on the connecting device main body, and the operation and effect thereof are as follows.

[0005]

The urging mechanism for urging the locking member toward the large-diameter side of the taper member is provided at the restricting portion.
It is located on the large diameter portion side of the tapered member and is in a state where the diameter is expanded. In this state, the locking member is pushed against the small diameter side of the tapered member against the urging force to reduce the diameter, and inserted into the pipe as it is, then the force that pushed the locking member is released. The force causes the taper member to slide and move toward the large diameter side to expand the diameter and contact the inner surface of the pipe. That is, the locking member can be locked to the inner surface of the pipe only by inserting the locking member into the pipe while applying a force against the urging mechanism. In this case, since a projection for locking to the uneven inner surface of the pipe is provided on the outer peripheral portion of the locking member, for example, this connecting device is used for a pipe having an uneven inner surface such as a corrugated pipe. Even if it is, the locking can be ensured, and the locking member can be hardly detached from the pipe. When the moving operation unit is operated from the locked state to draw the tapered member toward the connecting device main body, the pipe is also drawn toward the connecting device main body while being locked by the tapered member. Since the connecting device main body is provided with a seal portion that seals between the connecting device main body and the pipe by applying the entire circumference of the end of the pipe, the pipe drawn as described above has the end face portion thereof. Contact the seal. As a result, even if the pipe is inserted into the ground, the lubricating material and water hardly enter the pipe. If the end portion of the pipe is brought into contact with the seal portion and the taper member is still drawn toward the connecting device main body, the locking member is expanded in diameter and strongly pressed against the inner surface of the pipe, so that locking is further ensured.

[0006]

Therefore, the locking member can be locked to the inner surface of the pipe simply by inserting the locking member into the pipe while applying a force against the urging mechanism, thereby improving workability. Furthermore, even when this connecting device is used for a pipe having an uneven inner surface such as a corrugated pipe, locking can be reliably performed, and the locking member does not easily come off the pipe. It is possible to prevent redoing of the connection work, etc., and also, even if the pipe is inserted into the ground, it is difficult for the sliding material and water to enter the pipe, thereby preventing the pipe from being contaminated. An apparatus for connecting a buried pipe can be provided.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows a buried pipe pull-in device 1 and a propulsion device 2 for a propulsion method.

In the propulsion device 2, a drilling pipe 3 (an example of a propulsion body) having a drilling head 15 for propelling the soil between the first construction pit A and the second construction pit B, A plurality of propulsion tubes 4 subsequent to 3 are preliminarily connected to bendable via joints (not shown) to form a propulsion unit 5. The propulsion unit 5 is wound by a propulsion unit winding drum 6 installed outside the ground portion of the first construction pit A on the propulsion device 2 side.

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. The propulsion unit 5 rewound from the propulsion unit winding drum 6 is applied to the pressing mechanism 7.
The ink is supplied via a guide roller 8. Then, the pressing mechanism 7 connects the propulsion unit 5 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. In addition, 9 in the figure is a support jack that supports the side wall of the construction pit A from inside.

The second construction pit B on the retraction device 1 side
Outside the ground, a drum 10 for winding a buried pipe is installed. The burying pipe winding drum 10
, A corrugated pipe 11 as a buried pipe is wound up.

A guide roller 12 is provided at the entrance of the second construction pit B, and the corrugated pipe 11 unwound from the burying pipe winding drum 10 is moved into the second construction pit B by the guide roller 12. You will be guided. As will be described later, 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 a coupling device 13 to operate the pressing mechanism 7 in reverse. Thus, instead of the propulsion unit 5 being pulled out of the soil, it is drawn into the soil.

As shown in FIG. 2, a drive shaft 1 which is rotatable and extends from a drilling pipe 3 at the tip of the propulsion unit 5 is shown.
An excavating head 15 for excavation is connected to the excavating head mounting portion 14 a via a stopper ring 16 in a state where the excavating head 15 is key-fitted so as to rotate integrally with the drive shaft 14. The excavating head 15 is formed with a pressure receiving surface 17 for receiving earth pressure during propulsion and changing the propulsion direction of the propulsion head to the direction in which the earth pressure was received. And the drive shaft 14
Is driven to rotate to change the direction of the pressure receiving surface 17,
The propulsion unit 5 is configured to be able to bend freely.

The excavating head 15 has the pressure receiving surface 17
From the side, a head connecting bracket 22 of the connecting device 13 described later.
A connection hole 18 into which (an example of a mounting portion of the connection device 13) can be inserted is formed. A male screw portion 20 for connecting the head connection fitting 22 is formed at the tip of the drive shaft 14. The connection hole 18 is formed so that the head connection fitting 22 can be inserted from the longitudinal direction of the drive shaft 14. The male screw portion 20 is formed by rotating the head connection fitting 22 around the drive shaft. It is formed to be screwed.

As shown in FIGS.
The head connecting metal fitting 22 for attaching to the excavating head 15, a ring-shaped locking member 24 abutting on the inner surface 23 of the corrugated pipe 11, a rod-shaped tapered member 25 for externally fitting the locking member 24, Is a conical column-shaped coupling device body 2
6 is provided.

The head connection fitting 22 is formed by connecting first and second joint fittings 29 and 30 to both ends of a shackle 28, respectively. The first joint fitting 29 is a fitting for connecting to the excavating head 15, and has a female screw part 29 </ b> A screwed to the male screw part 20 of the drive shaft 14 at one end, and a shackle 28 at the other end. U-shaped main body 28A
Is formed with a first engagement hole 29B.
The second joint fitting 30 is a fitting for connecting to the tapered member 25, and is a female thread portion 25 </ b> A of the tapered member 25.
A threaded portion 30A for a taper member is provided at one end, and a second engagement hole 30B for engaging the screw shaft 31 of the shackle 28 is formed at the other end. A flange 27 is formed near the proximal end of the male screw portion 30A.

The locking member 24 has an outer peripheral portion formed by the large-diameter portion 2.
4A and the small diameter portion 24B. As shown in FIG. 3, the whole is divided into three parts in the circumferential direction of the inner surface 23 of the corrugated pipe 11, and the inner surface is formed into a small-diameter portion 24.
B is formed on the tapered inner surface 32 such that the diameter becomes smaller toward the end. The large-diameter portion 24A has a corrugated pipe 1
A projection 35 for locking to the inner surface 23 of the unevenness is formed. The projections 35 are formed in a chevron shape over the entire circumference of the corrugated pipe 11, and are provided at a plurality of constant intervals in the axial direction.

The tapered member 25 has a part of an outer peripheral part formed in a columnar shape, and the remaining part is formed on a tapered outer surface part 33. The tapered outer surface portion 33 is provided with the tapered inner surface portion 32.
The cylindrical portion 36 is formed on the small diameter portion 24B side of the tapered outer surface portion 33 to have the same diameter as the small diameter portion 24B. The locking member 24 is externally fitted to the tapered outer surface portion 33 via a rubber ring 37, and is attached to the coupling device main body 26 in a state where the large diameter side of the tapered outer surface portion 33 projects outward. . In addition, the female screw part 2 screwed with the male screw part 30A of the second joint fitting 30 is provided.
5A is formed at the end on the column 36 side.

A through hole 38 is formed in the connecting device main body 26 along the axis.
At the end on the side of the taper member 25, a hole 39 having a diameter larger than that of the through hole 38 is formed, and a spacer 40 is fixed to the bottom wall of the hole 39 by bolts. As shown in FIG. 4, the spacer 40 has a long hole 40A, and the long hole 40A is located concentrically with the through hole 38. The cylindrical portion 36 of the tapered member 25 has an oval cross section in conformity with the shape of the elongated hole 40A. Then, the column 36 is inserted into the elongated hole 40A.
From the opposite side of the through hole 38, the male screw portion 30A of the second joint fitting 30 is inserted into the through hole 38, and the female screw portion 25 is inserted.
A is screwed with the male screw portion 30A. The taper member 25 can be prevented from rotating around the axis by fitting the taper member 25 into the through hole 38 via the spacer 40 as described above. The flange 27 of the second fitting 30 is brought into contact with the end face of the connecting device main body 26,
The movement of the second joint fitting 30 toward the taper member 25 is prevented.

The female thread portion 25A of the tapered member 25
Is formed deeper than the male screw portion 30A of the second joint fitting 30. By rotating the second joint fitting 30 around the axis, the female screw portion 25A is screwed with respect to the male screw portion 30A, and the tapered member is formed. 25 can be moved in the axial direction thereof. That is, the second joint fitting 30 constitutes a moving operation unit that moves the tapered member 25 in the axial direction.

In a state where the tapered member 25 with the locking member 24 fitted outside is inserted into one end of the corrugated tube 11, the tapered member 25 is moved to the side closer to the connecting device main body 26 in accordance with the operation. In addition, a restricting portion 41 that restricts the locking member 24 from approaching the connecting device main body 26 is provided on the connecting device main body 26. The restricting portion 41 includes the locking member 2
The small diameter portion 24B is formed so as to be freely fitted in the hole 39, and the end face of the small diameter portion 24B and the spacer 40 are opposed to each other.

An urging mechanism 42 for urging the locking member 24 toward the large-diameter side of the tapered outer surface portion 33 is provided on the restricting portion 41.
The biasing mechanism 42 is configured by connecting the end face of the small diameter portion 24B and the spacer 40 with a spring 43.

A sealing portion 44 for sealing between the connecting device main body 26 and the corrugated pipe 11 is applied to the end of the connecting device main body 26 on the side of the hole portion 39, by applying the entire periphery of the end of the corrugated pipe 11. It is provided. The seal portion 44 is formed such that the outer diameter of the end portion is smaller than the outer peripheral portion of the central portion so that the corrugated tube 11 can be fitted inside the end portion, and the seal portion 44 is formed between the outer peripheral portion and the corrugated tube 11. An end face 45 is provided for applying the end. Note that a rubber packing 46 is attached to the end surface 45.

In the connecting device 13 having the above structure, with the shackle 28 removed, the locking member 24 is pressed against the small diameter side of the tapered member 25 against the urging force of the spring 43 to reduce the diameter. When the force that pushed the locking member 23 is released after the insertion into the inner member 11, the locking member 24 slides toward the large diameter side of the tapered member 25 by the urging force and expands the diameter, and the inner surface 23 of the corrugated pipe 11 is expanded.
Abuts and locks. Thereafter, when the second joint fitting 30 is rotated to draw the tapered member 25 toward the connecting device main body 26, the corrugated pipe 11 is also moved to the tapered member 25.
While being locked to the connecting device main body 26, and the end surface thereof comes into contact with the seal portion 44. Further, when the taper member 25 is pulled toward the connecting device main body 26, the locking member 24 is expanded in diameter and strongly pressed against the inner surface 23, so that the locking is further ensured. When the locking is completed, the first fitting 2
9 is screwed into the drive shaft 14 and the shackle 28 is connected to the second joint fitting 30 to complete the connection operation.

[Another Embodiment] The front end of the locking member 24 may be chamfered, and the front end may serve as a fitting guide for the corrugated tube 11. As the urging mechanism 42, a rubber ring, a disc spring, or the like may be used instead of the spring.

The burying pipe may be a pipe other than a corrugated pipe.

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 (a) A partially cutaway sectional view of a connecting device for a buried pipe (b) A partially cutaway sectional view of a state where a connecting device for a buried pipe is connected to a buried pipe

FIG. 2 is a cross-sectional view showing a state in which a connecting device for a buried pipe is connected to a propulsion body and a buried pipe.

FIG. 3 is a cross-sectional view of the ha of FIG. 2;

FIG. 4 is a sectional view taken along the line in FIG. 2;

FIG. 5 is an overall view of a propulsion device and a device for retracting a buried pipe.

[Explanation of symbols]

 Reference Signs List 3 propulsion body 11 buried pipe 22 attachment part 23 inner surface of buried pipe 24 locking member 25 taper member 26 connecting device main body 32 taper inner surface part 33 taper outer surface part 35 protrusion 41 limiting part 42 biasing mechanism 44 sealing part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Susumu Kaminaka 1-1-1 Hama, Amagasaki-shi, Hyogo Kubota Technology Development Laboratory Co., Ltd. (56) References Hikaru 2-136194 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A mounting member (22) for mounting to a distal end portion of a propulsion body (3), and a locking member (24) abutting against an inner surface (23) of a burying pipe (11) is attached to the inner surface. (23) The inner surface of the locking member (24) is formed in a tapered inner surface portion (32) having a smaller diameter toward one end side, and the tapered inner surface is formed. The connecting device body (26) movably in the axial direction of the taper member (25) having the tapered outer surface portion (33) that can be fitted inside the portion (32) with the large diameter side protruding outward. ), And a moving operation section for moving the tapered member (25) in the axial direction thereof is provided, and the locking member (24) is externally fitted to the tapered member (25), and these are fitted to the pipe (11). ) Is inserted into one end of the tapered member. As the (25) is moved to the side closer to the connecting device main body (26), the restricting portion (41) for restricting the locking member (24) from approaching the connecting device main body (26). ) To the connecting device body (2).
6) A connection device for a buried pipe provided in 6), wherein a protrusion (35) for locking to the inner surface of the unevenness of the pipe (11) is provided on an outer peripheral portion of the locking member (24). An urging mechanism (42) for urging the stop member (24) toward the large-diameter side of the taper member (25) is connected to the restricting portion (4).
1), a seal (44) for sealing between the connecting device main body (26) and the pipe (11) by applying the entire circumference of the end of the pipe (11) to the connecting device main body (26). ) Is a connecting device for buried pipes.