JP2000205475A - Connecting structure of independent corrugated pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a pipe coupling body to be externally coupled to and connected to an independent corrugated pipe, by constituting a circular support ring for holding a seal ring in a circumferential groove from an inner diameter direction so as to be detachable in an inner circumference. SOLUTION: This connected independent corrugated pipe 1 has many independent corrugations in an axial direction on the periphery thereof, and on the outside thereof a covered periphery 11 is provided. A cylindrical pipe coupling body 3 has an abutting portion 34 disposed on its center, a tapered opening 33 at its end portion, and a circumferential groove 32 inside thereof. A seal ring 51 is held in the circumferential groove 32 from an inner diameter direction by a circular support ring 35 having a tapered diameter-extended portion. In such a state, the pipe coupling body 3 can be externally coupled, with ease, from the tapered diameter-extended portion to the independent corrugated pipe 1. When an end of a pipe is stopped by the abutting portion 34 and the support ring 35 is drawn out, the seal ring 51 tightens the covered periphery 11 to seal. By forming a section in an axial direction of abutting portion 34 to be R-shaped, curved pipe portion can easily be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a corrugated pipe or corrugated pipe made of plastics, and more particularly to an information box used to hold an information cable such as an optical cable therein. It relates to the connection structure of independent corrugated pipes made of plastics of the so-called system.

[0002]

2. Description of the Related Art When an information cable such as an optical cable is buried underground, it is made of a vinyl chloride resin, a polyethylene resin, a fiber reinforced plastic resin or the like, and has a diameter of 150 mm.
It is installed in a large-diameter outer tube of at least mm. These outer pipes have a number of independent waves or ribs arranged in the axial direction on the outer surface of the pipe, and have a structure that prevents them from flattening or crushing due to the weight of the soil when buried. I have.

In order to connect such independent corrugated pipes 1 and 1 ', a seal ring 51 is fitted in a circumferential groove 52 as shown in a side view in which the upper half is shown in cross section in FIG. Extrapolating the cylindrical pipe joint body 5 from the pipe ends of the coated independent corrugated pipes 1 and 1 'to be connected, and a coating outer periphery 11 near the pipe end of the coated independent corrugated pipe; A seal ring 51 is inserted between the cylindrical groove 52 and the circumferential groove 52 of the cylindrical pipe joint body 5 for connection. Since the seal ring 51 is in tight contact with the outer periphery 11 of the independent corrugated pipe and the inner surface of the cylindrical pipe joint body to hermetically seal, even if the connected independent corrugated pipes 1 and 1 'are buried in the soil. , Earth and sand, water, air, etc.
And the outer periphery 1 of the inner surface of the pipe joint body 5 and the coating 1 of the independent corrugated pipe 1
The information cable installed in the independent corrugated pipe can be protected without intruding into the pipe from a gap between the information cable and the information cable.

In the case of the independent corrugated pipes 2 and 2 'without coating, as shown in a side view of which the upper half is shown in cross section in FIG. A seal ring 61 is fitted in a groove between the adjacent independent waves 22 on the outer periphery of the seal ring 61, and the outer periphery of the seal ring 61 is connected by extrapolating the cylindrical pipe joint body 6. The seal ring 61 is tightly sealed between the side surfaces of the adjacent independent waves 22 and the inner surface of the fitting body to protect the information cable installed in the independent corrugated pipe as in the case of FIG. it can.

Here, the independent corrugated tubes 1, 1 ', 2, 2'
Made of vinyl chloride resin, polyethylene resin, fiber reinforced plastic resin, etc., the inner surface of which is straight to make it easier to pass through multiple inner cables for protecting information cables, and the outer periphery of which is a rib-shaped independent wave 22 are provided side by side in the tube axis direction. A double tube made of a material different from the portion of the independent wave 22 on the outer periphery of the tube and the straight inner surface,
Alternatively, it may be a triple tube as shown in FIG.

[0006] The pipe joint body 6 has a cylindrical shape as a whole, and its inner diameter is smaller than the free outer diameter of the seal ring 61 in order to strongly tighten the seal ring 61. Opening 63 with a taper at the end of body 6
And the independent corrugated pipes 2 and 2 ′ with the seal ring 61 extrapolated can be easily inserted into the pipe joint body 6. In addition, there is an abutment portion 64 having a reduced inner diameter at the longitudinal center portion of the pipe joint main body, and the inserted independent waved pipe 2,
2 'does not go any further.

The inside diameter of the cylindrical pipe joint body is made slightly larger than the outside diameter of the independent corrugated pipe in order to extrapolate to the independent corrugated pipe. In the pipe joint for connecting the coated independent corrugated pipes 1 and 1 'shown in FIG. 9, a circumferential groove 52 is provided near the end of the inner surface of the pipe joint body, and the circumferential groove is provided in the circumferential groove. A seal ring 51 is fitted. Seal ring 51
Is smaller than the outer diameter of the pipe with an independent wave which is connected in a state (free state) fitted in the circumferential groove 52, so that the pipe joint in which the seal ring 51 is fitted in the circumferential groove 52. When the main body 5 is extrapolated from the ends of the independent corrugated pipes 1 and 1 ', the seal ring 51 comes into strong contact with the coating outer periphery of the independent corrugated pipe and the inner surface of the cylindrical pipe joint main body as shown in FIG.

[0008]

However, the pipe joint body 5 in which the seal ring 51 is fitted into the circumferential groove is used for the independent corrugated pipe 1,
When the seal ring 51 is externally inserted into the tube end 1 ', since the inner diameter of the seal ring 51 is smaller than the outer diameter of the tube with the independent wave, the inner peripheral portion of the seal ring 51 is independent as shown in the sectional view of FIG. The seal ring 51 may be damaged by hitting the end of the corrugated pipe. In addition, the insertion force required for extrapolation was as large as several hundred kg, which required a special insertion machine and was very poor in workability.

In the case of the uncorrugated tubes 2 and 2 'without coating shown in FIG. 10, the seal ring 61 must be previously attached to the groove between the independent waves 22 on the outer periphery near the tube end of the connected tube. There is. When disassembling the connected tube, the seal ring 61 attached to the groove between the independent waves 22 is removed.

In order for the seal ring 61 to be securely attached to the groove between the independent waves 22 on the outer periphery of the pipe and to be connected and sealed by the pipe joint body 6, the inner diameter of the seal ring 61 must be equal to the groove (or valley) between the independent waves. The outer diameter of the seal ring 61 must be slightly larger than the inner diameter of the pipe joint body 6 in a state (free state) in which the seal ring 61 is fitted in the groove (free state). Also, the shape of the cross section of the seal ring 61 is not limited to the groove (or trough) between the independent waves.
Obviously, it must enter and close the groove.

When the pipe joint body 6 is externally inserted into the pipe ends of the independently corrugated pipes 2 and 2 'in a state where the seal ring 61 is fitted in the groove between the independent waves 22, the outer diameter of the seal ring 61 becomes smaller than that of the pipe joint. Since the diameter is larger than the inner diameter of the main body, as shown in a cross section in FIG.
Even if the pipe 63 is held, the outer peripheral portion of the seal ring 61 hits the end of the pipe joint body and is strongly rubbed. was there.

The independent corrugated pipe is made of vinyl chloride resin, polyethylene resin, fiber reinforced plastic resin or the like, but has a large diameter of 150 mm or more and is buried in the soil. It has a strong structure that will not be crushed by the load of soil when it is done. For this reason, it is difficult to bend when it is necessary to bend, and it has been necessary to use a special bend tube to make a bent portion.

Accordingly, the present invention provides a connection structure that allows the pipe joint body to be easily extrapolated and connected to the independent corrugated pipe when connecting the independent corrugated pipe.

Another object of the present invention is to provide a pipe joint body having a connection structure that can be easily bent at the pipe joint portion.

[0015]

SUMMARY OF THE INVENTION According to the present invention, there is provided a connection structure for an independent corrugated pipe, in which a large number of independent waves are arranged in an axial direction and a coating is provided on the outer periphery thereof. Pipe fitting body having a large inner diameter, and fitted into a circumferential groove provided on the inner surface of the cylindrical fitting body, with connected independent waves fitted in the circumferential groove (free state) A seal ring having an inner diameter smaller than the pipe outer diameter, having an inner diameter larger than the connected independent corrugated pipe outer diameter, and having an outer diameter smaller than the inner diameter of the cylindrical pipe joint body, An annular support ring for holding the seal ring in the circumferential groove from the inner diameter direction is detachably provided on the inner periphery of the seal ring.

The connection structure of an independent corrugated tube according to the present invention includes a connected independent corrugated tube in which many independent waves are arranged in an axial direction, and a cylindrical tube having an inner diameter larger than the outer diameter thereof. A seal having an outer diameter larger than the inner diameter of the cylindrical pipe joint main body in a state (free state) fitted in the groove between the joint main body and the independent wave of the connected independent corrugated pipe. A pipe having an inner diameter larger than the outer diameter of the connected independent corrugated pipe, and an outer diameter smaller than the inner diameter of the cylindrical fitting body, and connecting the seal ring to the connected independent corrugated pipe. An annular support ring for holding the groove between the independent waves from the outer radial direction is detachably provided on the inner periphery of the pipe joint body.

In the connecting structure for an independent corrugated pipe according to the present invention, an inner surface of the cylindrical pipe joint main body has an abutting portion against which the connected independent corrugated pipe abuts. Preferably, the cross section is R-shaped.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 to 4 are longitudinal sectional views for explaining a connection structure of a first embodiment of the present invention, and FIGS. 5 to 8 are longitudinal sectional views for explaining a connection structure of a second embodiment of the present invention. . In these figures, FIG. 9 illustrates a conventional connection structure.
The same reference numerals are used for the same parts as in FIGS.

In FIGS. 1 to 4, reference numerals 1 and 1 'denote connected independent corrugated tubes. Many independent waves are provided on the outer periphery side by side in the axial direction of the tube, and a coating outer periphery 11 is provided outside the tube. Reference numeral 3 denotes a pipe joint main body, which has an abutment portion 34 having a reduced inner diameter in the center,
On both sides are parallel cylinders. The inner diameter of the cylindrical pipe joint body 3 is larger than the outer diameter of the connected independent corrugated pipes 1, 1 '. There is a tapered opening 33 at the end of the cylinder. A circumferential groove 32 is provided on the inner surface near the end, and a seal ring 51 is fitted in the circumferential groove. The inner diameter of the seal ring 51 is smaller than the outer diameter of the connected independent corrugated pipe, and when fitted to the independent corrugated pipes 1 and 1 ', the outer circumference of the pipe is tightened. Also, 35
Is an annular support ring, the inner diameter of which is larger than the outer diameter of the pipe with independent corrugations, and the outer diameter of which is smaller than the inner diameter of the fitting body, and has a long tapered expanded portion at the tail end. The seal ring 51 is inserted into the pipe joint body from the end so that the seal ring 51 is inserted into the circumferential groove 3 of the pipe joint body 3.
2 from the inner diameter direction. A connected independent corrugated pipe 1, 1 ′, a pipe joint body 3 having a circumferential groove 32,
With the seal ring 51 and the annular support ring 35,
The connection structure of the first embodiment for connecting the independent corrugated tubes 1 and 1 'is configured.

When the annular support ring 35 is inserted into the pipe joint body from the end with the seal ring 51 fitted in the circumferential groove 32 of the pipe joint body 3, the seal ring 51 becomes larger than the independent corrugated pipe outer diameter. Also has a small inner diameter, so that it is pushed and expanded by the outer circumference of the annular support ring 35 and rides on the support ring 35. In this state, the fitting 3
Is extrapolated to the independent corrugated tubes 1, 1 ', as shown in the longitudinal sectional view of FIG. It can be easily extrapolated to the tubes 1, 1 '. The pipe joint body is further pushed into the independent corrugated pipe, and the end of the pipe with independent corrugation hits the abutting portion 34 having a reduced inner diameter at the center of the pipe joint body and stops. This state is shown in FIG. 2 in a longitudinal sectional view. Then, when the annular support ring 35 is pulled out from between the pipe joint body 3 and the independent corrugated pipe 1, the seal ring 51 tightens the independent corrugated pipe coating outer periphery 11, and the gap between the pipe body 3 and the independent corrugated pipe covering 3 is removed. Seal. This state is shown in FIG. 3 in a longitudinal sectional view.

Here, the abutting portion 34 is narrowed down to a corrugated shape in its transverse section, and the longitudinal section, that is, the axial section is R-shaped. For this reason, the pipe joint body 3 is easily bent at this abutting portion. As shown in FIG. 4, when the two independent corrugated pipes 1 and 1 ′ connected by the pipe joint body are bent, the pipes bend at the abutting portions 34, so that a bent pipe portion can be easily formed.

Next, a connection structure according to a second embodiment of the present invention will be described with reference to FIGS. Reference numerals 2 and 2 'denote tubes with connected independent waves, and a number of independent waves 22 are provided on the outer periphery thereof in a line in the tube axis direction. Here, the coating is not applied to the outer periphery of the independent corrugated tube. Reference numeral 4 denotes a pipe joint body, which has a contact portion 44 having a reduced inner diameter in the center, and a parallel cylindrical portion on both sides thereof. The inner diameter of the cylindrical pipe joint body 4 is larger than the outer diameter of the connected independent corrugated pipes 2, 2 '. There is a tapered opening 43 at the end of the cylindrical portion. A seal ring 61 is fitted in a groove between adjacent independent waves 22 several mountains away from the tube ends of the independent wave tubes 2 and 2 '. This seal ring outer diameter is in a free state, that is, in a state where it is fitted in the groove of the independent corrugated pipe but the pipe joint body 4 is not inserted outside,
It is slightly larger than the cylindrical portion of the pipe joint body 4, so that when the pipe joint body is extrapolated, the outer periphery of the seal ring 61 is pressed against the inner surface of the cylindrical section to seal it. Reference numeral 45 denotes an annular support ring whose inner diameter is larger than the outer diameter of the pipe with independent corrugations and has an outer diameter smaller than the inner diameter of the fitting body, and has a long tapered shape at its tail end. Have a part. With the annular support ring 45 extrapolated to the tube end of the independent waved tube in which the seal ring 61 is fitted in the groove between the independent waves several mountains away from the tube end,
The seal ring 61 is held in the groove between the independent waves of the tubes 2 and 2 'from the outer radial direction. Here, the connected independent corrugated pipes 2 and 2 ′, the pipe joint body 4, the seal ring 6
1 and an annular support ring 45, an independent corrugated pipe 2,
The connection structure of the second embodiment for connecting 2 'is constituted.

With the seal ring 61 fitted in the groove between the independent waves of the independent waved tubes 2, 2 ', the annular support ring 4
When 5 is extrapolated from the ends of the independent corrugated pipes 2 and 2 ′, the seal ring 61 has an outer diameter larger than the outer diameter of the independent corrugated pipe, and is crushed by the inner circumference of the annular support ring 45. Then, the support ring 45 rides on the seal ring 61. In this state, when the pipe joint body 4 is extrapolated to the independent corrugated pipe, as shown in a vertical sectional view in FIG. 5, an opening 43 is formed from the pipe end of the independent corrugated pipe 2 to which the support ring 45 is attached.
Can easily be extrapolated. The pipe joint body is further pushed into the independent corrugated pipe 2 so that the independent corrugated pipe end has an abutment portion 4 having a reduced inner diameter at the center of the pipe joint body.
Stops at 4 FIG. 6 shows this state in a longitudinal sectional view. Then, when the annular support ring 45 is pulled out from between the pipe joint body 4 and the independent corrugated pipe 2, the seal ring 61 is pressed against the cylindrical portion of the pipe joint body 4 from the inside, and Seal between. This state is shown in FIG. 7 in a longitudinal sectional view.

Here, the abutting portion 44 is narrowed down to a corrugated shape in a transverse section, and a longitudinal section, that is, an axial section is R-shaped. For this reason, the pipe joint body 4 is easily bent at this abutting portion. As shown in FIG. 8, when the two independent corrugated pipes 2 and 2 ′ connected by the pipe joint body are bent, the pipes are bent at the abutting portions 44, so that a bent pipe portion can be easily formed.

[0025]

As described above in detail, in the connection structure of the independent corrugated pipe according to the present invention, when connecting the independent corrugated pipe, the pipe joint body is connected by easily extrapolating the independent corrugated pipe. be able to.

An axial section at the center of the pipe joint body is R
Since it has an abutting portion in a shape, it can be easily bent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connection structure according to a first embodiment of the present invention, in which a pipe joint body has begun to be externally inserted into a sheathed independent corrugated pipe.

FIG. 2 is a longitudinal sectional view showing a connection structure according to the first embodiment of the present invention, in a state where the pipe joint body has been externally inserted into a coated independent corrugated pipe.

FIG. 3 is a longitudinal sectional view showing a connection structure of the first embodiment of the present invention, in which a pipe joint body is externally inserted into a sheathed independent corrugated pipe.

FIG. 4 is a longitudinal sectional view showing a state in which an independent corrugated pipe with a coating is connected in the connection structure of the first embodiment of the present invention, and showing a state where a butting portion of a pipe joint body is bent.

FIG. 5 is a longitudinal sectional view showing a connection structure according to the second embodiment of the present invention, in which the pipe joint body has begun to be externally inserted into an independent corrugated pipe.

FIG. 6 is a longitudinal sectional view showing a connection structure according to a second embodiment of the present invention, in a state where the pipe joint body has been externally inserted into an independent corrugated pipe.

FIG. 7 is a longitudinal sectional view showing a connection structure according to the second embodiment of the present invention, in which a pipe joint body is extrapolated to an independent corrugated pipe.

FIG. 8 is a longitudinal sectional view showing a state in which an independent corrugated pipe is connected in the connection structure according to the second embodiment of the present invention, and showing a state where an abutting portion of a pipe joint body is bent.

FIG. 9 is a longitudinal sectional view of a conventional connection structure showing a state where an independent corrugated pipe with a coating is connected.

FIG. 10 is a longitudinal sectional view of a conventional connection structure showing a state in which independent corrugated tubes are connected.

FIG. 11 is a longitudinal sectional view of a conventional connection structure in which the pipe joint body has begun to be externally inserted into a sheathed independent corrugated pipe.

FIG. 12 is a longitudinal sectional view of a conventional connection structure in which a pipe joint body has begun to be externally inserted into an independent corrugated pipe.

[Explanation of symbols]

 1, 1 ', 2, 2' Independent wave pipe 11 Coated outer periphery 22 Independent wave 3, 4, 5, 6 (cylindrical) pipe joint main body 32, 52 Circular groove 33, 43, 63 Opening 34, 44, 64 Abutment 35, 45 Annular support ring 51, 61 Seal ring

Continued on the front page (72) Inventor Kenichi Saito 2nd Daifuku, Kuwana-shi, Mie F-term in Hitachi Metals Co., Ltd. Kuwana Plant 3H017 CA03

Claims (3)

[Claims] 1. A connected pipe with independent waves in which many independent waves are arranged in the axial direction and the outer circumference of which is covered, a cylindrical pipe joint body having an inner diameter larger than its outer diameter, A seal ring fitted in a circumferential groove provided in the inner surface of the cylindrical pipe joint main body and having an inner diameter smaller than the outer diameter of the connected independent corrugated pipe in a state (free state) fitted in the circumferential groove; In the connection structure, the inner diameter of the pipe is larger than the outer diameter of the pipe with the independent corrugated connection, and the outer diameter is smaller than the inner diameter of the cylindrical fitting body, and the seal ring is held in the circumferential groove from the inner diameter direction. Characterized in that an annular support ring is provided detachably on the inner periphery of the seal ring. 2. A connected independent corrugated pipe in which many independent waves are arranged in an axial direction, a cylindrical pipe joint body having an inner diameter larger than its outer diameter, and a connected independent corrugated pipe. In a connection structure having a seal ring having an outer diameter larger than the inner diameter of the cylindrical pipe joint main body in a state (free state) fitted in the groove between the independent waves, which can be externally fitted in the groove between the independent waves, It has an inner diameter larger than the outer diameter of the connected independent corrugated pipe, and an outer diameter smaller than the inner diameter of the cylindrical pipe joint main body, and the seal ring is inserted into the groove between the independent waves of the connected independent corrugated pipe from the outer diameter direction. A connection structure for an independent corrugated pipe, wherein an annular support ring for holding the pipe is detachably provided on an inner periphery of the pipe joint body. 3. The cylindrical pipe joint body has an abutment on its inner surface with which the connected independent corrugated pipe abuts, and the abutment has an R-shaped cross section in the axial direction. 3. The connection structure for an independent corrugated pipe according to claim 1, wherein