JP2003120874A - Connecting method of corrugated pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting method of a corrugated pipe capable of connecting end parts to each other in a state excellent in watertightness regardless of a distance spaced between the end parts of the corrugated pipe. SOLUTION: The connecting method of the corrugated pipe to connect the resin made corrugated pipes 11 to each other by a split coupler 15 is constituted of a process to confront the end parts of the corrugated pipe 11 with each other in a state where they are separated by specified length, a process to inject a putty material 17 by at least more than one round of a trough part of an outer surface of an end part of the opposed corrugated pipe 11, a process to cover a rubber tube 18 for sealing on the putty material and an outer periphery of a crest part of its circumference and a process to make the split coupler 15 firmly in a fastened state by installing the split coupler 15 so that inner surfaces of the end parts make contact with each other on an outer surface of the rubber tube 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method of connecting a corrugated pipe used as an outer pipe of a buried pipe for an optical communication cable.

[0002]

2. Description of the Related Art Recently, a resin inner pipe is inserted into a resin corrugated pipe buried in the ground, and an optical communication cable is inserted into the inner pipe to form a network using the optical communication cable. It is proposed to build and perform information communication.

Here, the corrugated pipe is formed in a cross-sectional area through which a large number of inner pipes can be inserted, but usually, in order to reduce the initial construction cost, a new inner pipe is formed inside the corrugated pipe. A small number of inner pipes are inserted to secure an additional space that can be inserted. Then, when it is necessary to add an optical communication cable, a new inner tube is drawn into the additional space for the corrugated tube, and the optical communication cable is inserted through the inner tube.

However, the corrugated pipe may be bent in the vertical direction or the horizontal direction in order to avoid an underground obstacle such as an existing buried pipe. When a new inner pipe is inserted into the additional space, there is a problem that the bent inner part of the corrugated pipe interferes with the previously inserted inner pipe so that the new inner pipe cannot be inserted.

That is, since the inner pipe is not fixed to the corrugated pipe, the inner pipe moves vertically or horizontally in the bent portion of the corrugated pipe to block the expansion space of the corrugated pipe. . Therefore, when a new inner pipe is drawn into the expansion space of the corrugated pipe, the new inner pipe interferes with the inner pipe that has been inserted earlier at the bent portion of the corrugated pipe, and the new inner pipe cannot be inserted. It will be difficult.

Further, since the inner pipe is not fixed to the corrugated pipe, the expansion and contraction of the inner pipe is not synchronized with the expansion and contraction of the corrugated pipe, which causes a problem in end treatment.

In response to such a problem, as described in International Publication Nos. WO01 / 01535 and WO01 / 02155, a plurality of inner pipes are mutually formed inside the corrugated pipe over the entire cross section thereof. It is inserted while adjoining,
Further, there has been proposed a buried pipe for an optical communication cable in which an inner pipe which is in contact with the inner surface of the corrugated pipe is fusion-fixed to the corrugated pipe along the pipe axial direction at the contacting position.

This buried pipe for optical communication cable is usually wound around a reel of about 250 m for the convenience of storage at the factory and transportation from the factory to the construction site. Then, at the construction site, piping is performed while connecting these ends.

As a method of connecting the buried pipe for optical communication cable, the corrugated pipes to be connected are confronted in a state of being separated for a predetermined length, and inner pipe joints are provided with receptacles at both ends. Using the provided socket type one,
While inserting and connecting the inner pipe into each receiving port of the inner pipe joint, as the outer pipe joint, using a split joint with packing having an uneven surface matching the corrugated shape of the outer surface of the corrugated pipe on the inner surface, A method is adopted in which the concavo-convex surface of the end portion is fastened so as to fit the concavo-convex surface of the outer tube.

However, in this buried pipe for optical communication cable, the inner pipe is distorted when the inner pipe is fixed to the corrugated pipe at the time of manufacture, or the outer surface of the inner pipe is peeled off when the corrugated pipe at the end is peeled off. In addition to making unevenness, the connection position of the inner pipe joints of the inner pipes and the uneven fitting position of the outer pipe joints of the corrugated pipes are easily misaligned, and the corrugated pipes have excellent watertightness. There is a problem that it is extremely difficult to connect with.

[0011]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and the end portions of the corrugated pipe are excellent in watertightness regardless of the distance between the end portions of the corrugated pipe. The purpose of the present invention is to provide a method of connecting a corrugated pipe that can be connected to the.

[0012]

The invention according to claim 1 of the present application (invention 1) is a method for connecting corrugated pipes, in which corrugated pipes made of resin are connected by a split joint. A step of confronting the end portions of the corrugated pipe in a state of being separated from each other by a predetermined length, a step of filling at least one circumference of a trough portion of an outer surface of the end portion of the corrugated pipe facing each other with a sealing material, and the sealing. A step of covering the outer periphery of the stopper and the mountain portion around it with a rubber tube for sealing, through which the split joint is mounted over the corrugated pipe at each end, and the split joint is firmly fastened. It is a method of connecting a corrugated pipe, which comprises a step of forming a state.

The invention according to claim 2 of the present application (invention 2)
Is a method for connecting corrugated pipes in which resin corrugated pipes are connected to each other with a split joint, and a step of confronting the corrugated pipes with their ends separated by a predetermined length A step of mounting a band-shaped sealing rubber material having a cross-sectional outer shape corresponding to the inner shape of the trough of the longitudinal section of the corrugated pipe on at least one circumference of the trough of the outer surface of the end of the pipe, and the sealing rubber A step of coating a rubber tube for sealing on the outer periphery of the material and the mountain portion around it, and mounting the split joint over the corrugated pipe at each end through them, and firmly fastening the split joint And a corrugated pipe connecting method.

The invention according to claim 3 of the present application (invention 3)
Is a method for connecting corrugated pipes in which resin corrugated pipes are connected to each other with a split joint, and a step of confronting the corrugated pipes with their ends separated by a predetermined length A portion having at least one round of the valley portion of the outer surface of the end portion of the pipe and an outer surface of the mountain portion, the portion having a cross-sectional outer shape corresponding to the inner shape of the valley portion of the longitudinal section of the corrugated pipe, and the portion covering the mountain portion adjacent to the portion. And a step of covering the outer periphery of the sealing rubber material with a rubber tube for sealing, and through the corrugated pipe at each end through them. A method for connecting corrugated pipes, which comprises a step of mounting a joint and making the split joint firmly in a tightened state.

The invention according to claim 4 of the present application (invention 4)
Is a plurality of resin inner tubes having a cross-sectional area through which one or more optical communication cables can be inserted, and the inserted inner tube is a direct or adjacent inner tube. It is the method for connecting the corrugated pipe of the present invention 1, the invention 2, or the invention 3, which is fixed to the inner surface of the corrugated pipe.

In the present invention, as the material of the corrugated pipe,
A flexible resin is used for winding a long embedded pipe formed by fixing an inner pipe to a corrugated pipe and transporting it to a construction site. For example, polyethylene is preferable.

In the present invention, as the material of the split joint, it is necessary to fix the corrugated pipes facing each other,
Corrosion-resistant materials are preferable because they do not deform due to strong tightening and are buried, and examples thereof include hard synthetic resin and stainless steel.

In the present invention, the diameter of the inner pipe is 1
All the inner tubes need not have the same diameter as long as they have a cross-sectional area through which more than one optical communication cable can be inserted. That is, inner tubes having different tube diameters can be combined and inserted into the inside of the corrugated tube to be fixed.

In the present invention, the filling or mounting length of the sealing material or the rubber material for sealing into the trough portion of the outer surface of the end portion of the corrugated tube needs to be at least one round or more.
About 5 to 2 rounds are preferable.

[0020]

According to the method for connecting corrugated pipes of the first aspect of the present invention, at least the step of facing the corrugated pipes in a state where the ends of the corrugated pipes are separated from each other by a predetermined length, and the trough portion of the outer surface of the opposite corrugated pipes. A step of filling the sealing material in one or more rounds, a step of covering the outer circumference of the sealing material and the mountain portion around it with a rubber tube for sealing, and a corrugated tube at each end through them. By mounting the split joint over the above, and by comprising the step of firmly fastening the split joint, regardless of the unevenness of the outer surface of the end portions of the corrugated pipe facing each other in a state of being separated by a predetermined length,
Through the sealing material and the rubber tube, it is possible to secure the connection that secures the hermeticity of the corrugated pipe and the fixing between the corrugated pipe by a simple method.

In the method for connecting corrugated pipes according to the second aspect of the present invention, at least the steps of facing the corrugated pipes in a state where they are separated from each other by a predetermined length, and the troughs on the outer surface of the opposing corrugated pipes. A step of mounting a band-shaped sealing rubber material having a cross-sectional outer shape corresponding to the inner shape of the valley of the longitudinal section of the corrugated pipe in one or more rounds, and sealing on the outer periphery of the sealing rubber material and the mountain portion around the sealing rubber material. For a predetermined length by including a step of coating a rubber tube for use and a step of mounting the split joint over the corrugated pipes of the respective end portions through them and making the split joint in a tightly fastened state. Regardless of the unevenness of the outer surface of the corrugated pipes facing each other in the separated state, the connection between the corrugated pipes is secured and the connection between the corrugated pipes is secured through the sealing rubber material and the rubber tube. Can be secured by a simple method.

In the method for connecting corrugated pipes according to the third aspect of the present invention, at least the step of causing the corrugated pipes to face each other in a state of being separated from each other by a predetermined length, and at least the troughs on the outer surface of the opposite corrugated pipes. A strip-shaped sealing rubber material having a portion having a cross-sectional outer shape that corresponds to the inner shape of the valley portion of the longitudinal section of the corrugated pipe and a portion that covers the adjacent mountain portion is attached to the outer surface of one or more turns and the mountain portion. A step, a step of covering the outer periphery of the sealing rubber material with a sealing rubber tube, and mounting the split joint over the corrugated pipe at each end therethrough to strengthen the split joint. By including the step of forming the fastened state, the corrugated pipe of the corrugated pipe is inserted through the rubber material for sealing and the rubber tube regardless of the unevenness of the outer surface of the end portions of the corrugated pipe facing each other in the state of being separated by a predetermined length. Easy to secure connection and secure between corrugated pipe It can be ensured by the method.

In the first to third aspects of the present invention, the corrugated pipe is inserted by inserting a plurality of resin inner pipes having a cross-sectional area through which one or more optical communication cables can be inserted. If the inner pipe is fixed to its inner surface either directly or through the adjacent inner pipe, the inner pipes will be connected to each other regardless of the uneven positions of the outer surfaces of the end portions of the corrugated pipe and the connection positions of the inner pipes. It is possible to secure the connection between the corrugated pipes and the fixation between the corrugated pipes by a simple method while maintaining the state where they are properly connected by the inner pipe joint in a highly sealed state. it can.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a side view and a partially cutaway front view illustrating an example of a corrugated pipe used in the present invention, which is used as an outer pipe of a buried pipe for an optical communication cable.

This optical communication cable buried pipe 10 includes a polyethylene corrugated pipe 11 having an outer diameter of 108 mm and an inner diameter of 86.4 mm, and three polyethylene inner pipes 12 having an outer diameter of 40 mm and an inner diameter of 35 mm. While being adjacent to each other, they are arranged so that their axes extend substantially parallel to the axis of the corrugated tube 11. The three inner pipes 12 are in contact with the inner surface of the corrugated pipe 11, are fused and fixed to the inner surface of the corrugated pipe 11 at respective set intervals, and the outer surfaces of the adjacent inner pipes 12 are fused to each other. It is fixed in place.

Specifically, as shown in FIG. 3, each inner tube 1
On the outer surface of 2, an electromagnetic fusion tape 13 in which a conductive tape such as an iron wire is embedded in a polyethylene tape or an electromagnetic fusion tape 13 in which a conductive tape such as iron powder is mixed and filled in a polyethylene tape is filled. They are wound at set intervals, and after inserting the inner tube 12 into the corrugated tube 11,
By loading the alternating magnetic force lines J on the electromagnetic fusion tape 13 via the magnetic force generation coil 14, an eddy current flows through the conductive metal of the electromagnetic fusion tape 13 to generate heat due to the resistance of the conductive metal, and thus the electromagnetic fusion tape. 13 melts. Then, each inner tube 12 is corrugated through the melted electromagnetic fusion tape 13
The inner pipe 12 that is fused and fixed to the inner surface of
The outer surfaces of are fused and fixed to each other.

As the tape base material of the electromagnetic fusion tape 13, polyethylene of the same quality as the corrugated pipe 11 and the inner pipe 12 is used. Further, the electromagnetic fusion tape 13 is wound around the inner pipes 12 at set intervals so that the electromagnetic fusion tapes 13 do not overlap each other when the three inner pipes 12 are bundled.

As a result, the three inner pipes 12 inserted into the corrugated pipe 11 are securely fused and fixed to the corrugated pipe 11 at the respective set intervals, and the adjacent inner pipes 12 are also fixed. Since they are securely fused and fixed to each other,
The mechanical performance of the corrugated pipe 11 can be improved, and since the expansion and contraction of the corrugated pipe 11 and the expansion and contraction of all the inner pipes 12 are synchronized, the end treatment can be easily performed. Further, since each inner pipe 12 is fusion-fixed to the corrugated pipe 11 at a set interval, the corrugated pipe 11 can be easily removed from the inner pipe 12 when connecting the buried pipe 10 for an optical communication cable. It can be peeled off and connection work can be performed in a short time. Further, since it is not necessary to preheat the inner pipe 12 to fuse and fix the corrugated pipe 11 and the inner pipe 12 at the time of manufacturing the corrugated pipe 11, it is possible to improve the production speed and the yield of the product accordingly. In addition, the mold structure can be simplified and the overall cost can be reduced.

FIG. 4 is an explanatory view showing an example of the split joint used in the present invention. As shown in FIG. 4, the corrugated pipe joint 15 is made of stainless steel, and has flange portions 152, 152 along both sides of the pair of half-divided cylindrical bodies 151, 151 that extend along the outward cracks. The flange portions 152, 152 provided facing each other can be fastened with a fastener (not shown) including a bolt and a nut.

FIG. 5 is an explanatory view showing an example of the inner pipe joint used in the present invention. As shown in FIG. 5, the inner pipe joint 16 is made of stainless steel, and cylindrical portions 162 are symmetrically projected on both sides of a disc-shaped inner pipe joint body 161. Each cylindrical portion 162 has a tapered surface 163 on its outer surface that gradually expands in diameter toward the center thereof so that each inner tube 12 can be pushed and expanded by being press-fitted into the inner tube 12. There is. Cylindrical portion 162 and inner pipe joint body 161 symmetrically provided on both sides
A communication hole 164 is formed in the.

Next, the buried pipe 10 for an optical communication cable shown in FIGS. 1 and 2, the corrugated pipe joint 15 shown in FIG. 4, and FIG.
An example of the method of connecting the corrugated pipe of the present invention using the inner pipe joint 16 (3 pieces) shown in Fig. 6 will be described with reference to Figs.

First, in the first step, as shown in FIG. 6, the pipe ends to be connected of the pair of buried pipes 10 for optical communication cables are connected to each other in a state where the pipes 11 with a predetermined long wave are peeled off. Three inner pipe joints 16 (only two appear in the drawing) are interposed between the three pairs of exposed and exposed inner pipes 12, 12 (only two pairs appear in the drawing).

In the second step, as shown in FIG. 7, a pair of optical communication cable buried pipes 10 and 10 are pulled by a winch or the like so as to approach each other, and three inner pipe joints 16 are joined.
Inner tube 1 that faces the cylindrical portions 162, 162 at both ends of the
Press into 2 and 12. As a result, each inner pipe 12, 12
Is pushed and expanded from the inside by the tubular portions 162 and 162 of the inner pipe joint 6.

In the third step, as shown in FIG. 8, the putty is applied to at least one round of the outer valley portion of the corrugated pipes 11 and 11 at the ends of the optical communication cable buried pipes 10 and 10 facing each other. The sealing material 17 made of a material is filled.

In the fourth step, as shown in FIG. 9, the sealing material 17 of each of the corrugated pipes 11 and 11 at the ends of the buried pipes 10 and 10 for the optical communication cable facing each other and the surrounding mountains. A rubber tube 18 for sealing is provided on the outer periphery of each part.
To cover. In addition, the buried pipe 1 for the optical communication cable facing each other
Sealing material 17, 1 for the corrugated tubes 11, 11 at the ends 0, 10
One rubber tube for sealing may be covered over 7 and the surrounding ridges. The thickness of the rubber tube 18 is preferably thick in order to secure sufficient sealing property, but it is suitable to be about 3 to 5 mm because it is necessary to firmly fix the corrugated pipes by the split joint. .

In the fifth step, as shown in FIG.
The inner pipes 12, 12 are connected to the cylindrical portions 162, 162 of the inner pipe joint 16.
With the state in which the split joint 15 is expanded from the inside by means of the rubber pipe 18 on the outer surfaces of the end portions of the corrugated pipes 11, 11 at the end portions of the embedded pipes 10, 10 for both optical communication cables,
The both ends of the corrugated pipe 1 are covered so that they come into contact with each other, and the split joint 15 is firmly fastened with a fastener (not shown).
Fix between the ends of 1 and 11.

Next, the buried pipe 10 for an optical communication cable shown in FIGS. 1 and 2, the corrugated pipe joint 15 shown in FIG. 4, and FIG.
Another example of the method for connecting corrugated pipes of the present invention using the inner pipe joint 16 (3 pieces) shown in Fig. 11 will be described with reference to Figs. 11 and 12.

In this example, in the method of connecting the corrugated pipe,
In the third step and the fourth step in the above example, FIG.
As shown in FIG. 1, instead of the sealing material 17 in the above example, a band-shaped sealing rubber material 19 having a cross-sectional outer shape that corresponds to the inner shape of the valley portion of the longitudinal cross section of the corrugated pipe 11 is used for the sealing. After the rubber material 19 is attached to at least one round of the valley portion of the outer surface of the end portions of the corrugated pipes 11, 11 facing each other, FIG.
As shown in FIG. 2, the method is the same as the method described with reference to FIGS. 6 to 10, except that the outer circumference of the sealing rubber material 19 and the surrounding mountain portion is covered with the sealing rubber tube 18. .

Next, the buried pipe 10 for an optical communication cable shown in FIGS. 1 and 2, the corrugated pipe joint 15 shown in FIG. 4, and FIG.
Another example of the method for connecting corrugated pipes of the present invention using the inner pipe joint 16 (3 pieces) shown in Fig. 13 will be described with reference to Figs. 13 to 15.

In this example, in the method of connecting the corrugated pipe,
In the third step and the fourth step in the above-mentioned example, instead of the sealing material 17 in the above-mentioned example, as shown in FIG. Portion 2 that covers the mountain portion adjacent to the portion 201
As shown in FIG. 14, at least one of the troughs on the outer surface of the end portions of the corrugated pipes 11 and 11 facing the sealing rubber material 20 is used by using the band-shaped sealing rubber material 20 having the shape of 02.
6 to 10 except that the rubber tube 18 for sealing is coated on the outer periphery of the rubber material 19 for sealing as shown in FIG. The method is the same as described.

In order to improve the sealing property, it is preferable that the side edges of the portion 202 that covers the ridges of the sealing rubber material 20 have tapered surfaces that overlap each other.

[0042]

Since the corrugated pipe connecting method of the present invention is configured as described above, the end portions of the corrugated pipe are excellent in watertightness regardless of the distance between the end portions of the corrugated pipe. The parts can be connected to each other.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a buried pipe for an optical communication cable used in the present invention.

FIG. 2 is a partially cutaway front view showing an example of a buried pipe for an optical communication cable used in the present invention.

FIG. 3 is a side view illustrating an example of a manufacturing method of an example of the buried pipe for an optical communication cable used in the present invention.

FIG. 4 is an explanatory view showing an example of a split joint used in the present invention, (a) is a side view thereof, and (b) is a front view thereof.

FIG. 5 is an explanatory view showing an example of an inner pipe joint used in the present invention, (a) is a side view thereof, and (b) is a front view thereof.

FIG. 6 is a partially cutaway front view for explaining the first step of the example of the method for connecting corrugated pipes of the present invention.

FIG. 7 is a partially cutaway front view for explaining the second step of the example of the method for connecting corrugated tubes of the present invention.

FIG. 8 is a partially cutaway front view illustrating a third step of the example of the method for connecting corrugated pipes of the present invention.

FIG. 9 is a partially cutaway front view illustrating a fourth step of the example of the method for connecting corrugated pipes of the present invention.

FIG. 10 is a partially cutaway front view for explaining the fifth step of the example of the method for connecting corrugated tubes of the present invention.

FIG. 11 is a third example of another connection method for corrugated pipes of the present invention.
It is a partially notched front view explaining a process.

FIG. 12 is a fourth example of another example of the method for connecting corrugated tubes of the present invention.
It is a partially notched front view explaining a process.

13A and 13B are explanatory views of a rubber material for sealing which is further used in the method for connecting corrugated pipes of the present invention, in which FIG. 13A is a sectional view showing one example thereof, and FIG. 13B is a sectional view showing another example thereof. Is.

FIG. 14 is a partially cutaway front view for explaining a third step of still another example of the method for connecting corrugated pipes of the present invention.

FIG. 15 is a partially cutaway front view for explaining a fourth step of yet another example of the method for connecting corrugated pipes of the present invention.

[Explanation of symbols]

10 Buried pipe for optical communication cable 11 Corrugated tube 12 inner tube 15 split joint 16 Inner pipe joint 17 Sealant 18 rubber tube 19,20 Rubber material for sealing 151 half cylinder 152 Collar

Claims (4)

[Claims] 1. A method for connecting corrugated pipes, wherein resin corrugated pipes are connected to each other by a split joint, wherein a step of facing each other with the corrugated pipes separated by a predetermined length is provided. At least one round of the valley of the outer surface of the end of the corrugated pipe,
The step of filling the sealing material, the step of covering the outer circumference of the sealing material and the mountain portion around the sealing material with a rubber tube for sealing, and the split joint over the corrugated pipe at each end therethrough. And a step of bringing the split joint into a tightly fastened state, and connecting the corrugated pipe. 2. A method of connecting corrugated pipes, wherein resin corrugated pipes are connected to each other by a split joint, wherein a step of facing each other with the corrugated pipe ends separated by a predetermined length is provided. At least one round of the valley of the outer surface of the end of the corrugated pipe,
A step of mounting a band-shaped sealing rubber material having a cross-sectional outer shape corresponding to the inner shape of the valley portion of the vertical cross section of the corrugated tube, and a sealing rubber tube on the outer periphery of the sealing rubber material and the mountain portion around the sealing rubber material. Connecting the corrugated pipe, which comprises a step of covering and a step of mounting the split joint over the corrugated pipe at each of the ends through them, and forcing the split joint into a tightly fastened state. Method. 3. A method for connecting corrugated pipes in which resin corrugated pipes are connected to each other by a split joint, wherein a step of facing the corrugated pipes in a state where ends of the corrugated pipes are separated by a predetermined length, At least one round of the trough of the outer surface of the end portion of the corrugated pipe and the outer surface of the crest portion are covered with a crest portion adjacent to a portion having a cross-sectional outer shape corresponding to the inner shape of the trough of the longitudinal section of the corrugated pipe. A step of mounting a band-shaped sealing rubber material having a portion to be
The step of covering the outer circumference of the rubber member for sealing with a rubber tube for sealing, and mounting the split joint over the corrugated pipe at each end therethrough to firmly tighten the split joint. A method of connecting corrugated pipes, which comprises a step of forming. 4. The corrugated tube has a plurality of resin inner tubes having a cross-sectional area capable of inserting one or more optical communication cables inserted therein, and the inserted inner tubes are directly or adjacent to each other. The method for connecting corrugated pipes according to claim 1, 2 or 3, wherein the inner pipe is fixed to the inner surface of the pipe.