JPH1123929A - Jig and method for additional insertion of transmission unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the jig for additional insertion which makes it possible to insert an additional unit without exerting any adverse effect on a transmission unit that is already laid. SOLUTION: The transmission unit additional insertion jig 1 is provided with a connection part 3 at its front part and a fitting part 2 at the rear part and also has a notch part 5 linking a through hole in the center with the outer periphery and a grip part 6 communicating with the outer periphery. The transmission unit 8 which is already laid by being inserted into a pipe 7 is clamped with a grip groove 6 and a fitting part 2 is fitted to the entrance of the pipe 7 which is already laid. The additional transmission unit 10 can be inserted by connecting a pipe 9 from an inserting device which inserts the transmission unit into a conduit by making use of compressed air to the connection part 3. The inserted transmission unit 8 can be detached through the notch part 5 when, the transmission unit additional insertion jig 1 is detached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission unit additional insertion jig for additionally inserting a transmission unit into a hollow pipe and laying multiple transmission units, and to a transmission unit additional insertion jig using the additional insertion jig. It is.

[0002]

2. Description of the Related Art As a method of inserting a transmission unit into a hollow pipe, for example, as described in JP-A-59-104607, gas is introduced into a hollow pipe at a speed higher than the traveling speed of the transmission unit. It is known to insert a transmission unit into a hollow pipe by feeding and pushing the transmission unit according to the gas flow. In recent years, a method of reducing costs by inserting a plurality of transmission units into one hollow pipe has been considered. The above-mentioned document states that "more than one optical fiber may travel in the same tubular traveling path", but the method is not explicitly disclosed.

[0003] As a method of inserting a plurality of transmission units into one hollow pipe, for example, Ishikawa, Sano, Tanaka, "A
Examination of Pipe Merging Module for BF Additional Pumping ", 199
6th IEICE Communications Society Conference, B-96
There is a method using a merging module as described in 1. FIG. 6 is an explanatory diagram of a method of inserting a transmission unit using a conventional merging module. In the figure, 11 is a hollow pipe, 12 is a transmission unit, 13 is a junction connector, 14
Is an insertion slot. At the end of the hollow pipe 11, a junction connector 13 is installed in advance. Junction connector 13
Is provided with a plurality of insertion ports 14, and each of the insertion ports 14
, The transmission unit 12 can be inserted.

In such a configuration, the transmission unit 12
When inserting the transmission unit 12 into the hollow pipe 11, the junction connector 13 must be installed in anticipation of additional insertion of the transmission unit 12 in the future. Conversely, the merging connector 13
The transmission unit 1 is installed in the hollow pipe 11 where no
2 cannot be additionally inserted. If additional insertion is absolutely necessary, the already laid transmission unit 12 is cut off and
Is installed, and then the already laid transmission unit 1
2 and a new transmission unit 12 needs to be additionally inserted.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has no adverse effect on a transmission unit that has already been installed, and has an additional insertion unit that can insert an additional unit later. It is an object of the present invention to provide a tool and an additional insertion method using the additional insertion jig.

[0006]

According to a first aspect of the present invention, there is provided an additional insertion jig used for inserting an additional transmission unit into a pipe having an existing transmission unit. An attachment portion attached to the inlet of the pipe is formed, and is formed of a cylindrical member having a transmission hole through which the additional transmission unit is formed at a central portion. Notches are formed so as to connect the outer periphery and the transmission hole, and at least one gripping groove for gripping the existing transmission unit is formed in the axial direction so as to communicate with the outer periphery. Is what you do.

According to a second aspect of the present invention, in the transmission unit additional insertion method, after the existing transmission unit is gripped in the existing unit holding groove of the additional insertion jig according to the first aspect, the transmission unit is inserted into the pipe. After attaching one end of the additional insertion jig, an additional transmission unit is sent through the communication hole of the additional insertion jig into the pipe.

[0008]

1A and 1B are views for explaining a first embodiment of a transmission unit additional insertion jig according to the present invention. FIG. 1A is a perspective view, and FIG. FIG. 1C is a cross-sectional view of a central portion in a used state. In the figure, 1 is a transmission unit additional insertion jig, 2 is a mounting portion, 3 is a connecting portion,
4 is a through hole, 5 is a notch, 6 is a holding groove, 7 is a pipe, 8 is an existing transmission unit, 9 is a pipe, and 10 is an additional transmission unit.

As shown in FIG. 1 (A), a transmission unit additional insertion jig 1 is generally formed in a cylindrical shape, and has a mounting portion 2 at a rear portion (right side in the drawing) and a front portion (left side in the drawing). Is formed. The mounting part 2 is formed so as to have an outer diameter substantially equal to the inner diameter of the pipe in which the transmission unit is already inserted, and the mounting part 2 is pushed into the inlet of the pipe so that the transmission unit additional insertion jig is connected to the pipe. Can be mounted airtight. The outer diameter of the connecting portion 3 is formed to be substantially equal to the inner diameter of the connecting portion 3 so as to hermetically fit with a pipe from a transmitting device for transmitting the transmission unit by the compressed gas. At the center of the transmission unit additional insertion jig 1, a transmission hole 4 is formed as a through hole.

A notch 5 is formed so as to connect the transmission hole 4 and the outer periphery of the transmission unit additional insertion jig 1. The notch 5 serves as a communication path from the outer periphery to the transmission hole 5 so as to cut the transmission unit additional insertion jig 1, and inserts the transmission unit transmitted through the transmission hole 4 as described later. It is provided to remove from the jig 1. The holding groove 6 is a groove for holding an existing transmission unit, and is formed to communicate with the outer circumference over the entire length of the transmission unit additional insertion jig 1. Therefore, the existing transmission unit can be gripped by being pushed into the gripping groove 6 from the outer periphery.

Although only one gripping groove 6 is shown in FIG. 1A, as shown in FIG. 1B which is a cross-sectional view of the central portion of FIG. In the embodiment, seven gripping grooves 6 are provided. In FIG. 1A, only one gripping groove 6 is shown for easy viewing. However, as an example, the holding groove 6 is
It may be a book or an appropriate number of two or more. Grip groove 6
Since it is desirable that the airtightness is good at the joint with the pipe while holding the existing transmission unit, the transmission unit additional insertion jig may be made of an elastic material, for example, rubber or synthetic rubber. Thus, it is preferable to use a material that is easily elastically deformed. When such a material is used, it is preferable that the width of the holding groove 6 be smaller than the outer diameter of the transmission unit. Since it is gripped by elastic deformation, it can be gripped without damaging the transmission unit,
Further, the existing transmission unit is not dragged and moved inside during the transmission of the additional transmission unit. Further, with the transmission unit additional insertion jig 1 attached to the pipe, the gap of the notch 5 can also be pressed down and closed, so that the airtightness can be improved. Since a rubber material generally has a large frictional resistance, when a rubber material is used as a material for the transmission unit additional insertion jig, the insertion hole 4
The inner surface is preferably subjected to high heat reprocessing to smooth the surface and reduce the coefficient of friction. Further, it is more desirable to lower the frictional resistance by making the inner surface of the insertion hole 4 bellow-like or by making fine streaks in the longitudinal direction so as to reduce the contact area with the transmission unit. .

Referring to FIG. 1C, a method of adding a transmission unit using the transmission unit additional insertion jig 1 described with reference to FIGS. 1A and 1B will be described. FIG. 1C is a cross-sectional view in which the transmission unit 8 is already inserted into the laid pipe 7 and an additional transmission unit 10 is inserted. After the existing transmission unit pulled out of the pipe 7 is pushed into one of the holding grooves of the transmission unit additional insertion jig 1 to be gripped, the mounting portion 2 of the transmission unit additional insertion jig 1 is inserted into the entrance of the pipe 7. Insert and attach. Then, a pipe 9 from an insertion device that inserts the transmission unit into the pipeline using compressed air as shown in Japanese Patent Publication No. 222291 is connected to the connection portion 3 to insert the additional transmission unit 10. Can be done. When the existing transmission unit 8 is not a live line, the pipe 9 can be assembled such that the existing transmission unit is taken into the pipe 9. In this embodiment, since the outer diameters of the pipe 7, the transmission unit additional insertion jig 1, and the pipe 9 are substantially equal, in a state where these are connected, the outer periphery is wrapped with an adhesive tape or the like to reinforce the seal and the connecting portion. By doing so, the airtightness and the pressure resistance can be increased and the transmission of the transmission unit can be performed.

After transmitting the additional transmission unit 10,
The additional transmission unit 10 can be removed from the transmission unit additional insertion jig 1 through the cutout 5. When a transmission unit is further added and transmitted, the already added transmission unit is moved to the holding groove 6 as an existing transmission unit, and similarly, the next transmission unit is added and inserted. Can be.

FIG. 2 is a view for explaining a second embodiment of the transmission unit additional insertion jig according to the present invention.
2A is a perspective view, and FIG. 2B is a cross-sectional view in a used state. In the figure, the same parts as those in FIG. In this embodiment, the shape of the mounting portion 2 is tapered. By making the portion having the largest outer diameter of the tapered portion larger than the inner diameter of the pipe 7, the airtightness between the transmission unit additional insertion jig 1 and the pipe 7 can be improved, and the existing transmission unit 8 can be used.
The gripping groove 6 that grips is narrowed, and the gripping force is improved. A similar effect is obtained by changing the outer diameter of the mounting portion 2 to the pipe 7 in FIG.
It can also be obtained by designing it slightly larger than the inner diameter of. In that case, it is necessary to make a large hole with a sufficient margin so that the transmission hole 4 is not deformed and crushed. Also, the connecting portion 3 may be similarly tapered.

FIG. 3 is a view for explaining a third embodiment of the transmission unit additional insertion jig according to the present invention.
3A is a perspective view, and FIG. 3B is a cross-sectional view in a used state. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the holding groove 6 is not formed over the entire length of the transmission unit additional insertion jig 1, and FIG.
As shown in the figure, the point formed halfway is different from the first and second embodiments. As shown in FIG. 3 (B), the existing transmission unit 8 can be taken out of the transmission unit additional insertion jig 1 and the additional transmission unit 10 can be transmitted therethrough. As in the embodiment, there is no need to pass the existing transmission unit 10 through the pipe 9,
The processing of the existing transmission unit 10 is simplified. Therefore, it is possible to transmit an additional transmission unit in a live state without disconnecting the existing transmission unit. Of course, in the first and second embodiments, the same use as in FIG. 3 (B) can be used. However, in the method of transmitting an additional transmission unit without inserting the existing transmission unit into the pipe 9, The third embodiment is more advantageous in terms of airtightness.

FIG. 4 is a cross-sectional view of a transmission unit additional insertion jig according to a fourth embodiment of the present invention in use. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the pipe 9 from the transmission device is inserted into the transmission hole 6 of the transmission unit additional insertion jig 1 to connect the pipe 9 to the additional insertion jig 1. When an elastic material is used as the material of the transmission unit additional insertion jig 1, it is better to make the inner diameter of the through hole 6 slightly smaller than the outer diameter of the pipe 9 and push the pipe 9 in for connection. Good. It is easy to use the method for transmitting an additional transmission unit without inserting the existing transmission unit into the pipe 9. Also in this embodiment, an additional transmission unit can be transmitted without changing the existing transmission unit while keeping the live line.

FIG. 5 is a sectional view of a central portion of a transmission unit additional insertion jig according to a fifth embodiment of the present invention.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the above-described embodiment, the holding groove 6 is formed in a slit shape, but in this embodiment, the holding groove 6 is a circular hole corresponding to the outer diameter of the transmission unit to be used, and is connected to the outer periphery by a cut groove. This is advantageous when the outer diameter of the transmission unit is large.

A specific example of the test will be described. The cross section is the same as that described with reference to FIG. 1B, but the grip groove has the shape shown in FIG. An overview of the prototype transmission unit additional insertion jig is a CR with an outer diameter of 8 mm and a length of 24 mm.
It was made of rubber and had a rubber hardness of 50. The rubber hardness is preferably about 30 to 50. The mounting portion 2 and the connecting portion 3 are 7 mm in length, 6 mm in outer diameter, and 4 mm in inner diameter of the through hole 4. This is for fitting into a pipe having an inner diameter of 6 mm and an outer diameter of 8 mm. The existing transmission unit 8 sent through the existing pipe has a Teflon coat applied to an optical fiber core of 0.9 mm in outer diameter coated with silicon and nylon. The existing transmission unit 8 was inserted into one of the holding grooves 6. In this transmission unit additional insertion jig 1, the end of the holding groove 6 is a circular hole having a diameter of 0.5 mm so that an excessive side pressure is not applied to the existing transmission unit 8. After the transmission unit 8 was arranged so as to enter this hole, the withdrawal force was measured for confirmation.
g. Since the resistance frictional force when transmitting the additional unit 10 is at most about several tens g, the gripping force of the transmission unit is preferably 100 g to 500 g. If there is no risk of damaging the existing transmission unit 8, a higher gripping force may be used. When the additional transmission unit is transmitted, air slightly escapes from the empty gripping groove 6 to the outside. Therefore, the air is buried with a suitable member having a diameter of about 1 mm, and there is an additional transmission unit to be transmitted next. In this case, the transmission unit that has already been
When the member is buried in the container, the buried member is taken out, so that the transmission efficiency is good. With the existing transmission unit 8 being held, the additional transmission unit insertion jig 1 was pushed into the pipe 7 and attached, and was horizontally wound with an adhesive tape and attached.

Thereafter, an experiment was conducted in which a pipe 9 from the pumping device was connected and an additional transmission unit was fed by pumping. The length of the pipe 7 to be sent is 50 m. The pressure of the introduction pipe 9 was raised by 2 atm from the atmosphere using a compressor, and a Teflon-coated nylon-coated core wire having an outer diameter of 0.9 mm was sent. Thereafter, the transmission unit additional insertion jig 1 was attached in the above-described manner, and the second unit was pressure-fed. Subsequently, the third unit and the fourth unit were repeatedly fed, so that the sixth unit was successfully fed. While the additional transmission unit was being pumped, the loss fluctuation was confirmed continuously at a wavelength of 1.55 μm, but no significant loss fluctuation was observed, and the existing transmission unit was added. During the transmission of the transmission unit.

As shown in FIG. 4, an experiment was also conducted on a method in which a pipe 9 from a pressure feeding device was inserted into a transmission hole of a transmission unit additional insertion jig 1 and connected. The pipe 9 has an outer diameter of 4 mm and an inner diameter of 2.5 mm. Also in this use example, a transmission result could be obtained similarly.

In the above-described embodiment, the method of transmitting an additional transmission unit using compressed air has been described. However, depending on the insertion distance, the transmission unit may be pushed in by using the rigidity of the transmission unit. May be inserted. In that case, an additional transmission unit is pushed into the pipe 7 from the opening on the connection portion side of the transmission unit additional insertion jig 1 and inserted. The transmission unit of the present invention is not limited to a single-core or multiple-core optical fiber unit, but can be applied to other transmission units such as electric communication lines.

[0022]

As is apparent from the above description, according to the present invention, the transmission unit is effectively stored by utilizing the gap in the hollow pipe, and the existing transmission unit is transmitted during the transmission of the additional transmission unit. Since the unit can be held in the holding groove, the additional unit can be sent smoothly while protecting the existing transmission unit without involving it. In addition, since the transmission unit additional insertion jig can be removed after the operation is completed, there is an effect that space can be saved for storage.

[Brief description of the drawings]

FIGS. 1A and 1B are views for explaining a first embodiment of a transmission unit additional insertion jig according to the present invention, wherein FIG. 1A is a perspective view, and FIG. FIG. 1 (C) is a cross-sectional view of the used state.

FIGS. 2A and 2B are views for explaining a second embodiment of the transmission unit additional insertion jig of the present invention, wherein FIG. 2A is a perspective view and FIG. .

FIGS. 3A and 3B are views for explaining a third embodiment of the transmission unit additional insertion jig of the present invention, wherein FIG. 3A is a perspective view and FIG. .

FIG. 4 is a sectional view of a transmission unit additional insertion jig according to a fourth embodiment of the present invention in a used state.

FIG. 5 is a sectional view of a central portion of a transmission unit additional insertion jig according to a fifth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a method of inserting a transmission unit using a conventional merging module.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transmission unit additional insertion jig, 2 ... Mounting part, 3 ... Connection part, 4 ... Transmission hole, 5 ... Notch part, 6 ... Grip groove, 7 ... Pipe, 8 ... Existing transmission unit, 9 ... Pipe, 10 additional transmission units

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Tanaka 1-chome, Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric Industries, Ltd. Yokohama Works

Claims (2)

[Claims] 1. An additional insertion jig used for inserting an additional transmission unit into a pipe in which an existing transmission unit is present, wherein an attachment part attached to an inlet of the pipe is formed at one end, It is formed of a cylindrical member having a transmission hole through which the additional transmission unit is formed at the center, and one notch for taking out the additional transmission unit connects the outer periphery and the transmission hole. The transmission unit additional insertion jig is formed as described above, and one or more gripping grooves for gripping the existing transmission unit are formed in the axial direction so as to communicate with the outer periphery. 2. After an existing transmission unit is gripped in a pipe in an existing unit holding groove of the additional insertion jig according to claim 1, one end of the additional insertion jig is attached to the pipe and then added. The transmission unit according to any one of claims 1 to 3, wherein said transmission unit is passed through a through hole of said additional insertion jig into said pipe.