JP2000199260A - End-section fixture for cable sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end-section fixture for a cable sleeve, by which a cable sleeve is fixed so as not to be slid when a cable such as an optical-fiber cable is to be inserted into the cable sleeve laid in a sewer, and the damage of the cable sleeve and a supporter for supporting the cable sleeve into the sewer can be prevented. SOLUTION: The end-section fixture 20 for the cable sleeve is used for fixing the end section of the cable sleeve 30 to a manhole 40. The end-section fixture has a holder 22 formed in a cylindrical shape, into which the end section of the cable sleeve is inserted by mutually abutting a pair of half body sections, and a mounting base 21, by which each half body 22c of the holder is supported mutually under the state, in which the half bodies are abutted mutually, and which is installed on the upper side of an opening section 41a in the internal surface of the peripheral wall of the manhole so that the end section of the cable sleeve is inserted into the holder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inserting a cable such as an optical fiber cable into a cable sheath tube supported at an upper part of a sewer pipe along an axial direction of the cable, and manipulating an end of the cable sheath tube. The invention relates to an end fixture for a cable sheath tube used to secure against a cable.

[0002]

2. Description of the Related Art A sewage pipe buried underground has a normal cross section of water flow smaller than that of an internal space, and a large section which is not used during normal water flow is provided above the sewage pipe. Space exists. Recently, it has been proposed to lay an optical fiber cable in such a space and construct an information network using the optical fiber cable. By constructing an information network using such an optical fiber cable, a control device in a sewage treatment facility or the like is connected to a pump or the like provided in a sewage tank, and centralized control and management of the pump and the like can be performed. .

In order to lay an optical fiber cable in the upper part of a sewer pipe, for example, a cable sheath pipe is supported in the upper part of the sewer pipe along the pipe axis direction, and at the same time when the sewer pipe is laid in the ground, It has been practiced to lay a cable sheath pipe in a sewer pipe. In this case, the cable sheath pipe supported in the sewer pipe is slidable along the axial direction.

[0004] When the cable sheath pipe is laid in the sewer pipe in this way, a cable such as an optical fiber cable is inserted into the cable sheath pipe. In this case, a cylindrical cable insertion jig whose one end is expanded in a trumpet shape is attached to the end of the cable sheath tube so that the cable is easily inserted into the cable sheath tube. In this jig, the end of the cable sheath tube is inserted into the end opposite to the end that has been enlarged in a trumpet shape, and attached to the end of the cable sheath tube with an adhesive or by screw connection. ing.

[0005]

When such a jig inserts a cable from a manhole to which a sewer pipe is connected into a cable sheath pipe attached to each end thereof,
Because the cable sheath tube is slidably supported with respect to the sewer tube, the cable sheath tube itself slides in the sewer tube due to frictional resistance with the cable, and is opposite to the end where the cable is inserted. The end may be drawn into the manhole. If the inner diameter of the manhole is 90 cm, the cable sheath tube will be drawn into the manhole for a maximum of 90 cm. In addition, the cable sheath pipe is usually 7 mm from the end of the sewer pipe connected to the manhole.
It is supported by a suitable support at about 0 cm above the manhole, but when the cable sheath slides over 70 cm, the jig attached to the end of the cable sheath supports the cable sheath. There is a possibility that the support may be damaged by colliding with the support.

The present invention has been made to solve such a problem, and an object thereof is to prevent a cable sheath tube from sliding when a cable such as an optical fiber cable is inserted into a cable sheath tube laid in a sewer pipe. Fixed to
An object of the present invention is to provide a cable sheath tube end fixing device capable of preventing breakage of a cable sheath tube and a support member supporting the cable sheath tube in a sewer pipe.

[0007]

According to a first aspect of the present invention, there is provided a cable sheath tube end fixing device, wherein an end portion of a cable sheath tube through which a cable is inserted is formed in a sewer pipe. It is supported along the pipe axis direction at the top, and when the end of this sewer pipe is attached to the opening provided on the peripheral wall of the manhole, to fix the end of the cable sheath pipe to the manhole An end fixture for a cable sheath tube to be used, comprising: a cylindrical holder into which an end of the cable sheath tube is inserted by abutting a pair of halves; and each half of the holder. A body is supported in a state where the bodies are abutted against each other, and a mounting base is provided in the holder above the opening in the inner wall of the manhole so that the end of the cable sheath tube is inserted. Characterized by .

The invention described in claim 2 of the present application (Invention 2)
In the end fixing device of the cable sheath tube, the end of the cable sheath tube through which the cable is inserted is supported at the upper part in the sewer along the pipe axis direction, and the end of the sewer is connected to the manhole. An end fixing device for a cable sheath tube used to fix an end portion of the cable sheath tube to a manhole when attached to an opening provided in a peripheral wall, and is inserted into an end portion of the cable sheath tube. And a mounting base for attaching the holder to the upper side of the opening in the inner surface of the peripheral wall of the manhole, the holder comprising:
A fixing ring having a flange provided on the outer periphery of one end of the short tube portion and a female screw provided on an inner peripheral surface of the short tube portion, and a tip of the cylindrical portion inserted into the short tube portion of the fixing ring A male screw is provided on an outer periphery of the portion to be screwed with a female screw of the fixing ring,
A support body provided with a protruding portion on the outer periphery of a base end of the cylindrical portion, a support ring placed on the fixing ring side on the cylindrical portion of the support body, and a cylinder of the support body A rubber ring covering the protruding portion side of the support portion, and when the support tool body is turned and the support tool body is drawn toward the opening of the manhole, the rubber ring is protruded from the support tool body. And a support ring, which is swellable outward.

[0009]

According to a first aspect of the present invention, there is provided an end fixing device for a cable sheath tube, comprising a cylindrical holder into which an end of the cable sheath tube is inserted by abutting a pair of halves, and a holder for the holder. Each of the halves is supported in a state where the halves are abutted with each other.In this holder, a mounting base is mounted above the opening in the inner wall of the manhole so that the end of the cable sheath tube is inserted. By having, the frictional force of the cable when the cable is inserted into the cable sheath tube is absorbed by the holder and is not transmitted to the cable sheath tube, and each end of the cable sheath tube is Since the cable is inserted into each holder attached to the manhole, the cable sheath does not slide when the cable is inserted into the cable sheath. Therefore, breakage of the cable sheath tube at the time of inserting the cable is reliably prevented.

[0010] The end fixing device of the cable sheath tube according to the second aspect of the present invention,
A holder having a portion inserted into the end of the cable sheath tube; and a mounting base for attaching the holder to an upper side of the opening in the inner surface of the peripheral wall of the manhole. A fixing ring provided with a female screw on the inner peripheral surface of the short cylindrical portion, and a fixing ring formed on the outer periphery of the distal end portion of the cylindrical portion inserted into the short cylindrical portion of the fixing ring. A support body provided with a male screw to be screwed into a female screw of the ring, and a protruding portion provided on an outer periphery of a base end of the cylindrical portion; and the fixing ring on the cylindrical portion of the support body. And a rubber ring covering the protruding portion on the cylindrical portion of the support body, turning the support body and pulling the support body toward the opening of the manhole. The rubber ring supports the projecting portion of the support When the optical fiber cable is inserted into the cable sheath tube by being sandwiched between the ring and being able to swell outward, the holder has its support part main body side in the end of the cable sheath tube. Since the optical fiber is inserted, the frictional force generated by the contact of the optical fiber with the inner peripheral surface of each holder mainly acts on the holder attached to the manhole, and is not transmitted much to the cable sheath tube. Therefore, when the optical fiber is inserted into the cable sheath tube, there is no possibility that the cable sheath tube slides, and breakage of the cable sheath tube when the cable is inserted is reliably prevented.

At the same time, the rubber ring can prevent the infiltration of sewage into the cable conduit formed by the cable sheath tube. In addition, turn the support body,
Push the holder away from the opening of the manhole to widen the distance between the protruding part of the support body and the support ring, reduce the diameter of the rubber ring to a free state, and attach the holder to the end of the cable sheath tube. It can be easily removed from the part, and maintenance and inspection can be easily performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partially broken side view showing an example of a use state of an end fixing device of a cable sheath tube of the present invention, and FIG. 2 is an enlarged view of a main part thereof. One end of the synthetic resin sewage pipe 10, which is supported on the upper part in a state where the cable sheath pipe 30 extends along the pipe axis direction, is connected to the manhole 40. When the optical fiber cable is inserted into the cable sheath tube 30, the cable sheath tube 3
It is used to fix the zero end to the manhole 40. The sewage pipe 10 is constituted by, for example, a hard vinyl chloride pipe.

The end of the sewer pipe 10 is inserted into the other end of a connection pipe 42, one end of which is supported in an opening 41a provided in the peripheral wall 41 of the manhole 40, and is connected to the manhole 40. It is connected. The connection pipe 42 protrudes horizontally inside the manhole 40 with one end inserted into the opening 41a, and has a central portion in the axial direction along the entire circumference along the circumferential direction. An outwardly protruding ridge is formed, and a concave groove 42a that opens inward over the entire circumference along the circumferential direction is formed in the ridge. The concave groove 42a is open all around the inner peripheral surface of the connection pipe 42, and a rubber ring 43 is mounted in the concave groove 42a over the entire circumference. Then, the end of the sewer pipe 10 is inserted from the distal end of the connection pipe 42 protruding from the manhole 40, and is held in the connection pipe 42 by the rubber ring 43 in a sealed state.

The cable sheath tube 30 held at the upper part in the drain pipe 40 has, for example, an inner diameter of 28 mm and an outer diameter of 34 mm.
Is constituted by a rigid vinyl chloride pipe. The end of the cable sheath tube 30 located inside the end of the sewer pipe 10 connected to the manhole 40 is fixed to the manhole 40 by the end fixing device 20 of the present invention attached to the peripheral wall 41 of the manhole 40. ing.

FIG. 3 is a front view of the end fixing device 20 of the present invention. The end fixing device 20 is attached to the peripheral wall 41 of the manhole 40.
And a cable sheath tube 3 that is inserted into the sewer pipe 10.
And a holder 22 attached to a lower portion of the attachment base 21 so as to support an end of the attachment base 21.

FIG. 4 is a front view of the mounting base 21 of the sheath tube end fixing device 20. The mounting base 21 is formed in a plate shape by a steel plate or the like.
Upper mounting body 21 mounted on the inner surface of the peripheral wall 41
a and a holder mounting portion 21b provided continuously below the mounting body portion 21a.

The holder mounting portion 21b is formed in the shape of a square flat plate, and has a circular through hole 2 at the center thereof.
1c is provided. In the lower part of this through hole 21c,
A groove 21d opened downward from the lower edge of the holder mounting portion 21b is provided continuously. A screw hole 21e is provided in the vicinity of each corner of each holder mounting portion 21b around the through hole 21c. The screw holes 21e are arranged at equal intervals in the circumferential direction on a concentric circle of the through hole 21c, and a screw groove is formed on each inner peripheral surface.

The mounting body 21a is formed in the shape of a rectangular flat plate whose width is larger than that of the holder mounting part 21b having a square shape.
The holder mounting portions 21 are inclined in opposite directions, respectively.
b is continuous with each of the left and right side edges. On each of the left and right sides of the mounting body 21a, a pair of upper and lower long holes 21f, each of which extends vertically, is provided. As shown in FIGS. 1 and 2, the anchor bolts 23 are respectively inserted into the respective slots 21 f, and the anchor bolts 23 are embedded in predetermined positions in the peripheral wall 41 of the manhole 40 in advance. Each is inserted and locked in the anchor member 24.

FIG. 5 is a vertical sectional view of the holder 22 attached to the holder attaching portion 21b of the attaching base 21, and FIG.
Is a vertical sectional view of the holder 22 attached to the attachment base 21. As shown in FIGS. 3, 5, and 6, the holder 22 is configured by a pair of upper and lower halves 22 c having the same shape but abutting each other in a state in which the vertical direction is reversed. Each of the half portions 22c has a semi-cylindrical holder main body portion 22a into which the end of the cable sheath tube 30 is inserted when butted against each other.
And a flange 22b protruding outward in a rectangular shape along a semicircle at one end of the holder body 22a. The inner peripheral surface of the end of each holder body 22a where the flange portion 22b is provided gradually expands in a trumpet shape toward the end surface. Each of the flange portions 22b is provided with a holder mounting portion 21 of the mounting base 21 when the pair of upper and lower halves 22c abut against each other.
It becomes a square flat plate shape similar to b.

The semi-cylindrical holder body 22a provided on each of the upper and lower halves 22c has an insertion port 31 of the cable sheath tube 30 except for the end provided with the flange 22b and its vicinity. Are formed to be thin, respectively, and a step 22e is provided on the inner side of the thin portion.
Are formed respectively. The holder body 22a of each half 22c can be inserted into a through hole 21c provided in the holder mounting portion 21b of the mounting base 21 when the holder main body 22a is abutted with each other to form a cylindrical shape. .

A pair of upper and lower halves 22c abut each other, and each flange 2 is formed in a square plate shape.
2b is provided with a bolt insertion hole 22d in the vicinity of each pair of corners constituting four corners of a square. The bolt insertion holes 22d are arranged at equal intervals in the circumferential direction in a concentric manner with the pair of holder body portions 22a abutted in a cylindrical shape. Then, in a state where the flange portions 22b abut against each other, the holder mounting portion 2 of the mounting base 21 is mounted.
1b, each bolt insertion hole 22c provided in each flange portion 22b and each screw hole 21e provided in the holder mounting portion 21b of the mounting base 21 are aligned. As shown in FIGS. 1 and 2, bolts 25 are respectively inserted into the pair of bolt insertion holes 22 of each flange portion 22b, and each bolt 25 is inserted into each screw hole 21e.
Each is screwed together.

The cable sheath tube end fixing device 20 having such a configuration is used as follows. First, manhole 4
When the connection pipe 42 is attached to the opening 41 a provided in the peripheral wall 41 of the manhole 40 by constructing the connection pipe 42, the end of the sewage pipe 10 is inserted into the connection pipe 42 and connected.
A cable sheath tube 30 is slidably supported in the axial direction at an upper portion in the drain pipe 10 connected to the connection pipe 42 in a state along the pipe axis direction.

When the sewer pipe 10 is connected to the manhole 40 and finishing such as inversion in the manhole 40 is completed, the opening 4 provided in the peripheral wall 41 of the manhole 40 is formed.
A pair of upper and lower anchor members 24 are embedded at predetermined positions on the inner surface on the upper side of 1a at predetermined intervals in the left-right direction. Each anchor member 24 is connected to the end fixture 20.
Are respectively buried so as to substantially correspond to the respective elongated holes 21f provided in the mounting base 21. Thereafter, the mounting base 21 of the sheath tube end fixing device 20 is disposed vertically above the opening 41 a in the peripheral surface 41 of the manhole 40, and the anchor bolt 23 is inserted into each of the long holes 21 f of the mounting base 21. Each is inserted. And manhole 40
The anchor bolts 23 inserted through the respective elongated holes 21f are temporarily fixed to the respective anchor members 24 provided in advance on the peripheral surface 41.

As described above, when the mounting base 21 is temporarily fixed to the peripheral surface of the manhole 40, the pair of upper and lower half portions 2 are attached to the holder mounting portion 21b of the mounting base 21.
The holder 22 constituted by 2c is attached. The holder 22 is in a state in which the cylindrical main body parts 22a are inserted into the through holes 21c provided in the holder mounting part 21b of the mounting base 21 in a state where the half parts 22c abut against each other. , Each flange portion 22b
Each of the bolts 25 is inserted into each of the bolt insertion holes 22d, and each of the bolts 25 is inserted into the holder mounting portion 2 of the mounting base 21.
1b is attached to the holder mounting portion 21b of the mounting base 21 by being screwed into each of the screw holes 21e provided in the mounting base 1b.

In such a state, the end of the cable sheath tube 30 disposed in the upper part of the sewer pipe 10 is slightly pushed inward so as to be away from the opening 40a of the manhole 40, and Holder 22 in fixture 20
However, the height position of the mounting base 21 is adjusted so that the height position is substantially the same as that of the cable sheath tube 30. When the holder 22 faces the cable sheath tube 30 supported in the sewer pipe 10, the anchor bolts 23 inserted into the respective elongated holes 21f of the mounting base 21 become
The mounting base 21 is locked by the anchor members 24 embedded in the peripheral wall 41 of the manhole 40 so that the manhole 40
Is fixed to the peripheral wall 41.

Thereafter, the end of the cable sheath tube 30 is pulled toward the inside of the manhole 40, and the end of the cable sheath tube 30 is positioned in the drain pipe 10 of the holder 22 in the end fixture 20. Is inserted into the end of the holder body 22a. In this case, the holder 22 can be easily inserted into each holder main body 22a because the upper and lower half portions 22c are in a state of abutting each other. The end of the cable sheath tube 30 inserted into each of the holder body portions 22a abutted in a cylindrical shape is disposed in the thin portion of each holder body portion 22a, and the end surface of the cable sheath tube 30 is attached to each of the holder body portions 22a.
a is slightly spaced from the step 22e formed on the inner peripheral surface.

When the sewer pipes 10 are connected to the respective manholes 40 in this manner, the ends of the cable sheath tubes 30 supported in the sewer pipes 10 are connected to the respective manholes 10 by the end fixing members 20. , Respectively fixed.

The sewer pipes 10 are laid between the manholes 10, and the cable sheath pipes 30 are laid in the sewer pipes 10. However, with each end fixture 20,
When it is fixed to each manhole 10,
An optical fiber cable is inserted into the cable sheath tube 30 from inside the manhole 40. The optical fiber cable is smoothly inserted into the cable sheath tube 30 along the thickened inner peripheral surface of each holder main body portion 22a of the end fixture 20 whose diameter is increased in a trumpet shape of the holder 22.

At this time, since the cable sheath tube 30 is appropriately spaced from the thickened inner peripheral surface of each holder body 22a, the thickness of each holder body 22a becomes thicker. The frictional force generated by the contact of the optical fiber cable with the inner peripheral surface is not transmitted to the cable sheath tube 30, but the holder 22 attached to the manhole 40.
Acts only on Therefore, when the optical fiber cable is inserted into the cable sheath tube 30, there is no possibility that the cable sheath tube 30 slides. Also, due to the frictional resistance of the optical fiber cable inserted into the cable sheath tube 30,
Even if the cable sheath tube 30 slides, the cable sheath tube 30
Also, the end of the optical fiber cable in the traveling direction at
Since it is fixed by the holder 22 attached to the manhole 40, the step portion 2 in the holder 22
By abutting the cable sheath tube 30 against 2e, the cable sheath tube 30 does not slide, and the optical fiber cable can be smoothly inserted into the cable sheath tube 30.

When the optical fiber cable is inserted into the cable sheath tube 30, the holder 22 is easily removed from the mounting base 21 by removing the bolts 25 screwed to the mounting base 21. In addition, since the holder 22 is in a state where the half portions 22c abut against each other, the holder 22 can be easily removed from the end of the cable sheath tube 30.

FIG. 7 is a longitudinal sectional view showing the use state of another example of the end support fixture of the cable sheath tube of the present invention, and FIG. 8 is another end support fixture of the cable sheath tube of the present invention. It is a front view which shows the example of. One end of the synthetic resin sewage pipe 10 whose upper end is supported in a state where the cable sheath pipe 30 extends along the pipe axis direction is connected to the manhole 40, When the optical fiber cable is inserted into the cable sheath tube 30, it is used to fix the end of the cable sheath tube 30 to the manhole 40.

The end support fixture 50 is provided with a holder 52 having a portion to be inserted into the end of the cable sheath tube 30.
And a mounting base 51 for mounting the holder 52 above the opening 41 a on the inner surface of the peripheral wall of the manhole 40.

The mounting base 51 is formed of a steel plate or the like in a flat plate shape, and is provided continuously on an upper mounting body portion 51a mounted on the outer surface of the peripheral wall 41 of the manhole 40 and below the mounting body portion 51a. Holder mounting part 5
1b. The holder mounting portion 51b is provided with a circular through hole 51c at the center thereof, and around the through hole 51c, a screw hole for screwing a bolt for fixing the holder 52 is provided.

As shown in FIG. 9, the holder 52 includes a fixing ring 521, a support body 522, and a support ring 5.
23 and a rubber ring 524. As shown in FIG. 10, the fixing ring 521 is provided with a flange 521b on the outer periphery of one end of the short cylindrical portion 521a, and the inner peripheral surface of the short cylindrical portion 521a is screwed in a state opposite to a normal screw. A female screw 521c serving as a screw is provided.

As shown also in FIG.
Is provided with a cylindrical portion 522a, the tip of which is inserted into the short cylindrical portion 521a of the fixing ring 521, and a male screw 522c screwed into the female screw 521c of the fixing ring 521 on the outer periphery of the tip. A protrusion 522b is provided on the outer periphery of the base end along the circumferential direction. Although the projection 522b is illustrated as being continuous in the drawing, it may be formed of a plurality of discontinuous projections. The outer diameter of the protrusion 522b is slightly smaller than its inner diameter so that it can be easily inserted into the cable sheath tube 30. A groove 522d for screwdriver is provided on the distal end surface of the cylindrical portion 522a.

As shown in FIG. 12, the support ring 523
Can be attached so as to cover the fixing ring 521 on the cylindrical portion 522a of the support body 522. The outer diameter of the support ring 523 is slightly smaller than its inner diameter so that it can be easily inserted into the cable sheath tube 30.

The rubber ring 524 can be mounted so as to cover the protruding portion 522b on the cylindrical portion 522a of the support body 522. The outer diameter of the support body 522
In the free state mounted on the cylindrical portion 522a of the support member main body 522, it is slightly smaller than its inner diameter so that it can be easily inserted into the cable sheath tube 30.
It has a shape that can bulge outward when sandwiched between the support ring 2b and the support ring 523, for example, a vertical cross-sectional shape.

As shown in FIG. 9, a rubber ring 52 is mounted on the cylindrical portion 522a of the support main body 52 on the side of the protruding portion 522b, and the support ring 523 is mounted on the distal end side. By inserting the tip of the cylindrical portion 522a of the component body 52 into the cylindrical body 521a of the fixing ring 523 and assembling the male screw 522c with the female screw 521c, the fixing ring 521, Support body 5
22, a support ring 523, and a holder 52 including a rubber ring 524 can be formed.

In the holder 52 in this state, when the tip of a screwdriver is inserted into the groove 522d of the holder 522 and turned to pull it toward the opening 40a of the manhole 40, the rubber ring 524 is brought into contact with the protrusion 522b. It is sandwiched between the support ring 523 and can bulge outward.

As shown in FIG. 8, the holder 52 separates the fixing ring 521 from other members.
The short cylindrical portion 521a is inserted into the through hole 51c of the mounting base 51, and the flange 521b of the fixing ring 521 is fixed to the holder mounting portion 51b of the mounting base 51 with the bolt 55. Short tube part 52
1a, a rubber ring 52 is provided at a tip end side of a support ring 523 on a protruding portion 522b side of a cylindrical portion 522a of a support tool body portion 52.
Can be assembled by screwing a male screw 522c onto a female screw 521c.

When the holder 52 is assembled in the state shown in FIG.
The support portion main body 522 side may be inserted so as to be pushed into 1c, and the flange 521b of the fixing ring 521 may be fixed to the holder mounting portion 51b of the mounting base 51 with the bolt 55.

The cable sheath tube end fixing device 50 having such a configuration is used as follows. As shown in FIG.
The manhole 40 is constructed and the surrounding wall 41 of the manhole 40 is constructed.
1 is connected to the opening 41a provided by a connecting pipe (not shown) as shown in FIG. In the upper part in the sewer pipe 10,
The cable sheath tube 30 is supported so as to be slidable in the axial direction along the tube axial direction.

Next, as in the case described with reference to FIG. 1, the mounting base 51 is temporarily fixed to the peripheral wall 41 of the manhole 40. The fixing ring 521 is separated from the other members of the holder 52, the short cylindrical portion 521 a is inserted into the through hole 51 c of the mounting base 51, and the flange 521 b of the fixing ring 521 is attached to the holder of the mounting base 51. After being fixed to the portion 51b with the bolt 55, the projecting portion 52 on the tubular portion 522a of the support body 52 is inserted into the short tubular portion 521a of the fixing ring 521.
A rubber ring 52 is mounted on the 2b side so as to cover the support ring 523 on the distal end side.
2c is assembled by screwing.

Next, the end of the cable sheath tube 30 disposed in the upper part of the sewer pipe 10 is connected to the opening 40 of the manhole 40.
a while slightly pushing it inward so as to move away from the holder a while adjusting the height position of the mounting base 51 so that the support portion main body 522 side of the holder 52 is at substantially the same height position as the cable sheath tube 30. After the support portion main body 522 side of 52 is inserted into the cable sheath tube 30, the mounting base 51 is fixed to the peripheral wall 41 of the manhole 40.

Thereafter, when the tip of a screwdriver is inserted into the groove 522d formed on the tip end surface of the support body 522 and turned, and the support body 522 is drawn toward the opening 40a side of the manhole 40, the rubber ring 524 is brought into contact with the support body 522. 522 projection 5
22b and the support ring 523, and bulges outward, so that the end of the cable sheath tube 30 is
Thereby, it is fixed to the peripheral wall 41 of the manhole 40. At the same time, the rubber ring 524 can prevent the infiltration of sewage into the cable conduit formed by the cable sheath tube 30.

In this way, the sewer pipes 10 are laid between the manholes 40, and the cable sheath pipes 30 are laid in the sewer pipes 10. The optical fiber cables are inserted into the cable sheath pipes 30. You. At this time, since the holder 52 has the support portion main body 522 side inserted into the end of the cable sheath tube 30, the frictional force generated when the optical fiber comes into contact with the inner peripheral surface of each holder 52 is mainly applied to the manhole 40. Acts on the attached holder 52 and is less transmitted to the cable sheath tube 30. Therefore, when the optical fiber is inserted into the cable sheath tube 30, there is no possibility that the cable sheath tube 30 slides, and the cable sheath tube is reliably prevented from being damaged when the cable is inserted.

Further, by inserting the tip of a screwdriver into the groove 522d formed on the end surface of the support body 522 and turning it, and pushing the support body 522 away from the opening 40a of the manhole 40, the support body 522 is projected. Part 52
2b and the distance between the support ring 523 are increased,
With the diameter of the rubber ring 524 reduced to a free state, the holder 52 can be easily removed from the end of the cable sheath tube 30, and maintenance and inspection can be easily performed.

[0049]

According to the first aspect of the present invention, since the end fixing device of the cable sheath tube is constructed as described above, the damage of the cable sheath tube when the cable is inserted is reliably prevented.

The end fixing device of the cable sheath tube according to the second aspect of the present invention includes:
In addition to the effect of the present invention 1, furthermore, it is possible to prevent sewage intrusion into the cable conduit formed by the cable sheath tube, and it is also possible to easily remove the holder from the end portion of the cable sheath tube, Maintenance inspections can be easily performed.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing an example of a use state of an end fixing device of a cable sheath tube of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view of the cable sheath tube end fixing device of the present invention.

FIG. 4 is a front view of a mounting base used for the end fixing device shown in FIG. 3;

FIG. 5 is a longitudinal sectional view of a holder used for the end fixing device shown in FIG. 3;

FIG. 6 is a cross-sectional view of the end fixing device shown in FIG. 3;

FIG. 7 is a longitudinal sectional view showing another example of a use state of another example of the end fixing device of the cable sheath tube of the present invention.

FIG. 8 is a front view showing another example of the end fixing device of the cable sheath tube of the present invention.

FIG. 9 is a sectional view showing a holder in the end fixing device shown in FIG. 8;

FIG. 10 is a partial sectional view showing a fixing ring in the holder shown in FIG. 9;

FIG. 11 is a partial cross-sectional view showing a support body in the holder shown in FIG. 9;

FIG. 12 is a sectional view showing a support ring in the holder shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sewer pipe 20, 50 Sheath pipe end fixing tool 21, 51 Mounting base 21a Mounting main body part 21b, 51b Holder mounting part 21c, 51c Through hole 21e Screw hole 21f Long hole 22, 52 Holder 22a Holder main body part 22b Flange part 22c Half part 23 Anchor bolt 24 Anchor member 25 Bolt 30 Cable sheath tube 40 Manhole 41 Peripheral wall 41a Opening 521 Fixing ring 521a Short cylindrical part 521b Flange 521c Female screw 521c Groove 522 Supporting body 522a Cylindrical part 522c Projecting part 522c Screw 523 Support ring 524 Rubber ring

Claims (2)

[Claims] An end of a cable sheath tube through which a cable is inserted is supported at an upper part in a sewer pipe along an axial direction of the pipe, and the end of the sewer pipe is provided in an opening provided on a peripheral wall of a manhole. An end fixture for a cable sheath tube used to secure an end of the cable sheath tube to a manhole when attached to a part, the cable being formed by a pair of halves abutting each other. A cylindrical holder into which the end of the sheath tube is inserted, and the respective halves of the holder are supported in a mutually butted state.In this holder, the end of the cable sheath tube is inserted. And a mounting base attached to the upper side of the opening in the inner surface of the peripheral wall of the manhole. 2. An end portion of a cable sheath tube through which a cable is inserted is supported at an upper portion in the sewer pipe along the pipe axis direction, and the end portion of the sewer pipe is provided in an opening provided on a peripheral wall of the manhole. An end fixture for a cable sheath tube used to secure an end of the cable sheath tube to a manhole when attached to a portion, the holder having a portion inserted into the end of the cable sheath tube. And a mounting base for attaching the holder to the upper side of the opening on the inner surface of the peripheral wall of the manhole, wherein the holder is provided with a flange on the outer periphery of one end of the short tube portion, and the inner peripheral surface of the short tube portion is provided. A fixing ring provided with a female screw, and a male screw that is screwed to the female screw of the fixing ring is provided on the outer periphery of the distal end of the cylindrical portion inserted into the short cylindrical portion of the fixing ring, A protrusion is provided on the outer periphery of the base end of the cylindrical portion. A support tool body, a support ring that covers the fixing ring on the tubular portion of the support tool body, and a rubber ring that covers the protrusion on the tubular portion of the support tool body. When the support body is turned and the support body is pulled toward the opening of the manhole, the rubber ring is sandwiched between the projecting portion of the support body and the support ring and outwardly. An end fixing device for a cable sheath tube, which is swellable.