JP3349498B2 - Connection tool used for cable laying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting tool used in a method of laying a cable such as an optical fiber cable, a coaxial cable, and a power cable through an existing pipe.

[0002]

2. Description of the Related Art In recent years, an optical fiber cable has been extended to each home in response to an increase in communication speed and capacity. When extending this optical fiber cable to each home, dig a groove between the manhole of the common optical fiber communication network buried in advance in the ground and the handhole of each home,
After laying a conduit in the groove, an optical fiber cable is inserted into the conduit to connect to an optical fiber communication network.

[0003]

However, the construction method in which a groove is dug between the manhole and the handhole of each household and a conduit is laid in the groove to insert an optical fiber cable has a problem that the construction cost increases. .

[0004] For this reason, an optical fiber cable is laid by using an excess space of an existing pipeline laid between a manhole and a handhole of each home, for example, a filled pipeline in which a power cable is provided. It has been proposed. In this case, the filling pipe laid between the manhole and the handhole of each household is not always extended linearly, and the pipe length may exceed 100 m in some cases. Therefore, simply pushing in the optical fiber cable directly from one end of the filled pipeline stops at the curved portion and cannot be pushed in further, or it cannot be pushed more than a certain length due to resistance with the power cable or pipeline in the middle. There was a problem that it became difficult to push.

[0005] The present invention has been made in view of the above-described problems, and even when an existing pipeline has a curved portion or the length of the pipeline is long, a cable such as an optical fiber cable is inserted. An object of the present invention is to provide a connection tool which is used in a method of laying cables to be laid and which can be securely connected in an existing pipeline.

[0006]

According to the present invention, a connecting tool for pushing is pushed in from one end of an existing pipeline, while a connecting tool for pulling out is pushed in from the other end of the existing pipeline and pushed in the existing pipeline. After the connecting tool for pulling and the connecting tool for pulling out are engaged, the connecting tool for pushing or the pulling out tool is pulled out, and the cable directly or indirectly connected to the wire rod is inserted through the existing pipeline. In the cable laying method,
The connecting tool for pushing includes an engaging fitting formed of a cylindrical fitting body and a plurality of hooks integrally provided on a front end surface of the fitting body, and a wire rod in which a connecting fitting is rotatably held at a tip. The hooks have different lengths, and are arranged within the projected area in the axial direction of the fitting body with the hooks directed outward, while the fitting body of the engaging fitting is connected to the through rod. The pull-out connecting tool is provided with a spherical head at the front end and a plurality of holes formed at intervals in the axial direction of the fitting body and the fitting body. Each of the receiving fittings is slidably inserted into each of the holes, and includes a receiving fitting made of a plurality of wires each having a ring formed at both ends, and a communication rod at the tip of which a connecting fitting is rotatably held. The fitting body is connected to the wire rod It is detachably connected to the tool, and the wire ring of the receiving bracket in the hooks and drawing a connecting tool engagement alloy tool in pushing for coupling the tool is characterized in that it is engageable.

In the present invention, the existing pipeline is not limited to a filled pipeline in which a power cable or the like is provided, and may be an open pipeline in which nothing is provided. It is not limited to a pipeline buried inside, but may be a duct or a pipe space extended inside a building.

[0008] In the present invention, when the wire rod is pushed into an existing pipeline, it is connected between an engagement fitting or a receiving bracket and the pipeline, or between a power cable or the like disposed in the pipeline. Is required to have a buckling strength that does not cause easy buckling due to the resistance generated and a flexibility capable of flexing according to the radius of curvature of the curved portion. An example of such a communication rod is a rod in which FRP is coated with a vinyl chloride resin.

In the present invention, the cable may be an optical fiber cable, a coaxial cable, a power cable, or the like.

In the present invention, each of the wire rods includes:
Preferably, the lengths are displayed at regular intervals. If the length is displayed on the line rod, the engagement fitting or the withdrawal connection tool of the push-in connection tool pushed in from one end of the existing pipeline, based on the length of the existing pipeline that is grasped in advance, etc. The current position of the receiving bracket can be determined,
By pushing the pull-out connection tool or the push-in connection tool by the set length according to the current position of the engagement fitting of the push-in connection tool or the receiving bracket of the pull-out connection tool, It is possible to reliably encounter and engage the receiving fitting of the drawing connecting tool.

In this case, in consideration of the visibility when working in a narrow space such as a handhole, at a plurality of locations, for example, one at an appropriate interval in the circumferential direction of the outer peripheral surface of the wire rod.
It is preferable to display the same length at three places at intervals of 20 degrees.

According to the present invention, the push-in connection tool is pushed from one end of the existing pipeline to an intermediate position, such as a curved portion, while the pull-out connection tool is pushed in from the other end of the existing pipeline, thereby providing a push-in connection. The hook of the engaging fitting in the connecting tool and the wire ring of the receiving fitting in the pulling connecting tool can be reliably and quickly engaged in the existing pipeline. That is, the plurality of hooks of the engagement fitting have different lengths and are arranged within the projected area in the axial direction of the fitting body with the hooks directed outward, while the plurality of wires of the receiving fitting are: Since it is scattered in all directions within the range of the length, the probability of engagement between the hook of the engagement fitting and the ring of the wire of the receiving fitting increases, and in a short time,
In addition, the engagement can be reliably performed, and the engagement between the two is not easily disengaged. After that, by pulling out the connecting tool for pushing or the connecting tool for pulling out, the cable directly or indirectly connected to one of the connecting rods via the rope can be inserted through the existing pipeline. .

[0013] Even if the fitting of the connecting tool for pushing is subjected to lateral pressure in the curved portion of the existing pipeline, deformation can be reliably prevented, and a power cable and the like are provided. When it is pushed into the filled conduit, even if a lateral pressure is applied to the power cable or the like at the curved portion, the power cable or the like is not damaged.

[0014] Therefore, since such an engagement fitting is hardly subjected to side pressure, it can be suitably used as an existing pipe for a GP pipe having a flat inner surface.

Further, according to the present invention, while the push-in connection tool is pushed in from one end of the existing pipeline, the pull-out connection tool is pushed in from the other end of the existing pipeline, and the push-in connection tool is inserted into the existing pipeline. A cable laying method for pulling out a push-in connection tool or a pull-out connection tool after engaging a pull-out connection tool, and inserting a cable directly or indirectly connected to a wire rod through an existing pipeline. In the above, the connecting tool for pushing includes a shell-shaped metal fitting body having a plurality of fins integrally provided on an outer peripheral edge of a rear end face thereof, and an extension metal fitting detachably connected to a rear end of the metal fitting body. Alloy tools,
A wire rod with a connecting bracket rotatably held at the tip,
And the extension fitting is formed to have an outer diameter having a certain interval between the extension fitting and the inner surface of the fin, and is formed to have a length larger than the length of the fin. A metal fitting body and a metal fitting body, which are detachably connected to a connecting metal fitting of a rod, and wherein the drawing connecting tool has a spherical head at a front end and a plurality of holes formed at intervals in an axial direction. , Each of which is slidably inserted into a corresponding one of the holes, and a receiving fitting made of a plurality of wires each having a ring formed at both ends, and a through rod having a connecting fitting rotatably held at a distal end thereof. Wherein the metal fitting body is detachably connected to the connecting metal fitting of the wire rod, and the fin of the engaging metal fitting in the connecting tool for pushing and the ring of the wire of the receiving metal fitting in the drawing connecting tool can be engaged. What to do A.

In the present invention, the existing pipeline is not limited to a filled pipeline in which a power cable or the like is provided, and may be an open pipeline in which nothing is provided. It is not limited to a pipeline buried inside, but may be a duct or a pipe space extended inside a building.

In the present invention, when the communication rod is pushed into an existing pipeline, it is connected between an engagement fitting or a receiving fitting and the pipeline, or between a power cable or the like disposed in the pipeline. Is required to have a buckling strength that does not cause easy buckling due to the resistance generated and a flexibility capable of flexing according to the radius of curvature of the curved portion. An example of such a communication rod is a rod in which FRP is coated with a vinyl chloride resin.

In the present invention, the cable may be an optical fiber cable, a coaxial cable, a power cable, or the like.

In the present invention, each of the wire rods includes:
Preferably, the lengths are displayed at regular intervals. If the length is displayed on the line rod, the engagement fitting or the withdrawal connection tool of the push-in connection tool pushed in from one end of the existing pipeline, based on the length of the existing pipeline that is grasped in advance, etc. The current position of the receiving bracket can be determined,
By pushing the pull-out connection tool or the push-in connection tool by the set length according to the current position of the engagement fitting of the push-in connection tool or the receiving bracket of the pull-out connection tool, It is possible to reliably encounter and engage the receiving fitting of the drawing connecting tool.

In this case, in consideration of the visibility when working in a narrow space such as a handhole, at a plurality of locations, for example, one at an appropriate interval in the circumferential direction of the outer peripheral surface of the wire rod.
It is preferable to display the same length at three places at intervals of 20 degrees.

According to the present invention, the push-in connection tool is pushed from one end of the existing pipeline to an intermediate position, such as a curved portion, while the pull-out connection tool is pushed in from the other end of the existing pipeline, thereby providing a push-in connection. The fins of the engagement fittings in the connection tool and the wire rings of the receiving fittings in the pull-out connection tool can be reliably and quickly engaged in the existing pipeline. That is, the plurality of fins of the engagement metal fitting are provided integrally on the outer peripheral edge of the rear end face of the shell-shaped metal fitting body, have a fixed interval between the metal fittings and the extended metal fitting, and However, since the wires of the receiving fitting are scattered in all directions within the length of the receiving fitting, the probability of engagement between the fins of the engaging fitting and the ring of the wire of the receiving fitting is reduced. Get bigger,
The engagement can be ensured in a short time and securely, and the engagement between the two is not easily disengaged. After that, by pulling out the connecting tool for pushing or the connecting tool for pulling out, the cable directly or indirectly connected to one of the connecting rods via the rope can be inserted through the existing pipeline. .

Further, the engagement fitting of the connecting tool for pushing can easily get over even if there is an obstacle in the existing pipeline.

Therefore, since such an engagement fitting is hardly subjected to resistance at the time of pushing, it can be suitably used as an existing pipeline for a flexible pipe having an uneven portion such as a rib on an inner surface.

In the present invention, the pull-out connecting tool is
A small-diameter wire rod having a fixed length is connected to the tip of the wire rod, and a connecting metal is rotatably held at the tip of the small-diameter wire rod. Is detachably connected, even when the radius of curvature of the curved portion of the existing pipeline is small, the small-diameter wire rod is greatly bent and is in a standby position outside the curved portion. The engagement fitting of the tool can be encountered.

[0025]

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

FIGS. 1 and 2 show the outline of the cable laying method.

In FIGS. 1 and 2, an existing pipeline 1 is laid between a manhole M and a handhole H of each home. In order to lay the optical fiber cable over the existing pipeline 1, a connecting tool 2 for pushing and a connecting tool 3 for pulling out are prepared.

As shown in FIG. 3, the connecting tool 2 for pushing is
A substantially cylindrical fitting body 21 having a male screw 211 formed at a rear end thereof, and a plurality of engaging portions, ie, a plurality of hooks 22 projecting forward from a front end surface of the fitting body 21.
And a connection fitting 23 for rotatably holding a connection fitting (nut) 231 having a female screw formed therein, and a wire rod 24 to which the connection fitting 23 is caulked. Male screw 211 of metal fitting body 21
Is screwed. Therefore, the metal fitting body 21 is rotatable to the wire rod 24 via the connecting metal fitting 23, and
It is detachably connected.

Here, an engaging fitting 25 is formed by the fitting main body 21 and a plurality of hooks 22 as an engaging portion. The plurality of hooks 22 have different projecting lengths from the front end face of the fitting main body 21. The hook portion 22a is disposed within the projected area of the metal fitting body 21 in the axial direction with the hook portion 22a facing outward (see FIG. 3B).

As shown in FIG. 4, the pull-out connecting tool 3 is
A male screw body 311 is formed at the rear end, and a cylindrical metal body 31 having a plurality of holes 31a penetrating in the diametric direction at intervals in the axial direction, and slides into the hole 31a of the metal body 31. A plurality of wires 32 which are freely inserted and formed with rings 321 at both ends, a connection fitting 33 for rotatably holding a connection fitting (nut) 331 formed with a female screw, and a connection fitting 33 are caulked and connected. Connecting rod 3
The male screw 311 of the fitting main body 31 is screwed to the connecting fitting 331 of the connecting fitting 33. Therefore, the fitting main body 31 is rotatably and detachably connected to the wire rod 34 via the connecting fitting 33.

Here, the receiving fitting 35 is formed by the fitting main body 31 and a plurality of wires 32 having rings 321 formed at both ends. And the hole 31 of the metal fitting body 31
a are alternately formed at intervals of 90 degrees in the circumferential direction, and when the wires 32 are inserted into the respective holes 31a,
A ring 321 is formed by caulking both ends of each wire 32.

A ball head 36 having an outer diameter larger than the outer diameter of the fitting main body 31 is screwed to the front end of the fitting main body 31.

The wire rods 24 and 34 are made of FRP coated with vinyl chloride resin, and have a buckling strength that does not cause easy bending, and a flexibility that can be bent in accordance with the radius of curvature of the curved portion. It has nature. And the connecting rod 2
The lengths are displayed at 1 m intervals on the outer peripheral surfaces of 4, 34. In this case, in consideration of the visibility when working in a narrow space such as the handhole H, it is preferable to display the lengths at, for example, three places at intervals of 120 degrees.

Next, a procedure for laying an optical fiber cable in the existing pipeline 1 using the push-in connection tool 2 and the pull-out connection tool 3 configured as described above will be described.

The existing pipeline 1 in this embodiment
Is, for example, a filled pipeline 11 in which the power cable C is disposed.
It is. The filling pipe 11 is a GP pipe having a diameter of 80 mm, and its gap width is about 21 mm. The radius of curvature of the curved portion is 310 mm.

For this reason, the outer diameter of the fitting main body 21 which is the maximum outer diameter portion of the pushing connecting tool 2 and the outer diameter of the ball head 36 which is the maximum outer diameter portion of the drawing connecting tool 3 are determined by the gap width. It is set to 17 mm for 21 mm. Also,
Wire rods 24 and 34 having an outer diameter of 8.5 mm are used.

First, the filling line 1 opening into the manhole M
1 is pushed in from one end. in this case,
The length of the filling pipe 11, the position of the curved portion, the radius of curvature thereof, and the like are known in advance, and the push-in connection tool 2 is pushed in by the set length correspondingly. At this time, the position of the leading end of the pushed-in connecting tool 2 can be grasped by a length display attached to the wire rod 24.

On the other hand, the pull-out connecting tool 3 is pushed in from the other end of the hole pipe 11 opening to the hand hole H. The pushing length of the pull-out connecting tool 3 can be calculated from the distal end position of the pushing-in connecting tool 2 together with the length of the filling pipe 11 and the like, and the set length is determined by the wire rod 35. Can be grasped on the basis of the length display attached to the outer peripheral surface. Therefore, the engagement fitting 25 of the connecting tool 2 for pushing and the receiving fitting 35 of the connecting tool 3 for extraction come into contact with each other at the set position of the filling pipe 11.

Push-in connection tool 2 and pull-out connection tool 3
Is pushed into the filling line 11 by the set length based on the lengths displayed on the connecting rods 24 and 34, respectively.
The pull-out connecting tool 3 is pushed and pulled, and the ring 321 of the wire 32 forming the pull-out connecting tool 3 is engaged with the hook portion 22a of the hook 22 forming the pressing connecting tool 2. In this case, since the wire 32 is slidably fitted into the fitting main body 31, the wire 32 is rubbed with the filling line 11 and the power cable C and along the inner surface of the filling line 11. As a result, the rings 321 are scattered and located at arbitrary positions in the gap of the filling conduit 11 within the length range. Therefore, the ring 321 of the wire 32 is engaged with the hook portion 22a of the hook 22 in a short time by pushing and pulling the pulling connection tool 3.
The push-in connection tool 2 and the pull-out connection tool 3 can be connected.

When the connecting tool for pushing 2 and the connecting tool for pulling out 3 are connected, a constant tensile force is applied so that the connecting state between the connecting tool for pulling out 2 and the connecting tool for pushing in 3 does not come off. In a state where the connecting tool 3 for pulling is
Then, the wire rod 24 is inserted and laid from one end of the manhole M side to the other end of the handhole H side of the filling pipe 11.

If the connecting rod 24 is laid over the filling line 11, an optical fiber cable (not shown) is connected to one end of the connecting rod 24, and the connecting rod 24 is connected to the filling line 11. If it is pulled out from one end or the other,
1 and can be laid by inserting an optical fiber cable.

Here, the filling pipe 11 which is the existing pipe 1 is used.
Even if the length of the pipeline is large, the length can be divided into two by the push-in connection tool 2 and the withdrawal connection tool 3, so that the pipe length must be longer than before. Can be. Further, even if there is a curved portion having a predetermined radius of curvature in the hole pipe 11, the wire rods 24 and 34 are bent, and the engaging fitting 25 and the receiving fitting 35 can get over the curved portion.

As a result, the filling line 1 which is the existing line 1
Even if there is a curved portion in 1 or the pipe length is long, the optical fiber cable can be inserted through the filled pipe 11 in a short time by using the connecting tool 2 for pushing and the connecting tool 3 for pulling out. Can be laid.

In this embodiment, the push-in connection tool 2 is pushed in from one end of the filling line 11 on the manhole M side and the pull-out connection tool 3 is pushed in from the other end of the filling line 11 on the handhole H side. Was explained, but the filling line 1
Depending on the length and shape of the hole 1, the pull-out connecting tool 3 is pushed in from one end of the filling line 11 on the manhole M side, and the pushing connecting tool 2 is pushed in from the other end of the filling line 11 on the hand hole H side. You may.

Also, the case has been described where the pull-out connecting tool 3 is pulled out, an optical fiber cable is connected to the wire rod 24 of the pushing-in connecting tool 2 and inserted into the filling line 11. And an optical fiber cable is connected to the wire rod 34 of the pull-out connecting tool 3 so that the filling conduit 11 is
Can also be inserted.

In this case, instead of directly connecting the transmission rods 24 and 34 and the optical fiber cable, the transmission rods 24 and 34 and the optical fiber cable may be connected via a cable rope.

Further, in the connection metal fitting 3 for drawing, FIG.
As shown in (a), a small-diameter wire rod 341 having a fixed length is connected to the tip of the wire rod 34, and the metal fitting body 31 is connected to the tip of the small-diameter wire rod 341 via a connection fitting 33. You can also. As described above, when the small-diameter wire rod 341 is connected to the wire rod 34, the flexibility of the small-diameter wire rod 341 is further increased, so that it is possible to cope with a curved portion having a smaller radius of curvature. (See FIG. 5B).

By the way, as the engaging fitting 25 of the connecting tool for pushing 2 of the above-described embodiment, the fitting main body 21 is formed so as to correspond to the GP pipe which is the filled pipe 11 having a flat inner surface.
The hook 22 having the hook portion 22a is integrally provided as an engaging portion at the tip of the head. However, the present invention is not limited to such an embodiment.

For example, as shown in FIG. 6, a fitting body 26 whose front end is formed in a bullet shape and an outer peripheral edge of the rear end face of the fitting body 26 as an engaging portion are appropriately spaced from each other. Fins 2 that are integrally formed so as to project rearward at intervals of 120 degrees and taper toward the tip.
7, the engagement fitting 25 can be formed. In this case, an external thread can be formed in the metal fitting body 26 and connected to the connecting metal piece 231 of the connecting metal piece 23. The fins 27
An extension fitting 28 having a length greater than the length of the fin 27 and an outer diameter capable of securing a gap equal to or larger than the diameter of the wire 32 between the extension fitting 28 and the inner surface of the extension fitting 28 are formed at the front and rear ends of the extension fitting 28. It is preferable to connect the male screws 281 and 282 thus formed to the metal fitting body 26 and the connecting metal fitting 231 of the connecting metal fitting 23, respectively.

In the above-described embodiment, the case where the optical fiber cable is laid in the existing filled conduit 11 in which the electric cable C is provided has been described. The present invention can be applied to the case where other cables such as cables are laid, and is not limited to the filled pipes 11 in which electric cables and the like are laid, but may be laid in newly opened pipes in which nothing is provided. You can also.

The existing pipeline 1 is not limited to a pipeline buried underground between a manhole and each household, but may be applied to a duct or a pipe space laid in a building.

[0052]

As described above, according to the connecting tool used in the cable laying method of the present invention, the hook of the engagement fitting in the pushing connecting tool pushed in from one end and the other end of the existing pipeline is provided. Alternatively, the fin and the ring of the wire of the receiving fitting in the drawing connecting tool can be engaged with each other in the existing pipeline in a short time and securely. In this case, even if there is a curved part in the existing pipeline,
In addition to being able to easily get over the pipe, even if the pipe length is long, it is possible to cope with the problem by dividing it with the connecting tool for pushing and the connecting tool for pulling out.

[Brief description of the drawings]

FIG. 1 is a schematic view for explaining a cable laying method using a connecting tool of the present invention.

FIG. 2 is an enlarged view of a portion A of FIG. 1 showing a connection state of a connection tool.

3A and 3B are a side view and a front view showing an embodiment of a connecting tool for pushing used in the cable laying method of the present invention.

FIG. 4 is a side view showing an embodiment of a drawing connecting tool used in the cable laying method of the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of a connecting tool for pushing and a rear view of an engagement fitting thereof.

FIG. 6 is a side view showing a modified example of the connection tool for drawing and an explanatory view of a state of use thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pipeline 11 Filled pipeline 2 Push-in connection tool 21, 26 Metal fitting body 22 Hook 22 a Hook part 23 Connection metal 231 Connection metal 24 Pass-through rod 25 Engagement metal 27 Fin 28 Extension metal 3 Connection tool 31 for extraction Fitting body 32 Wire 321 Ring 33 Connecting fitting 331 Connecting fitting 34 Communication rod 341 Small diameter communication rod 35 Receiving metal fitting 36 Ball head C Power cable M Manhole H Handhole

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shoji Higashimori 3-3-22 Nakanoshima, Kita-ku, Osaka-shi, Osaka Inside Kansai Electric Power Co., Inc. (72) Hiroyuki Matsuoka 3-3-1 Nakanoshima, Kita-ku, Osaka, Osaka 22 Kansai Electric Power Co., Inc. (72) Inventor Koichi Kubota 2-3-1 Honjo Higashi, Kita-ku, Osaka-shi, Osaka Kindennai Co., Ltd. (56) References JP-A-10-336829 (JP, A) Sho 61-161 019 (JP, U) Shokai Sho 59-37811 (JP, U) Shogo Sho 59-161316 (JP, U) Shokai Sho 62-54517 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) H02G 1/06 G02B 6/46 H02G 1/08

Claims (3)

(57) [Claims] 1. A connecting tool for pushing is inserted from one end of an existing pipeline.
While pushing in, pull out the connecting tool from the other end of the existing pipeline.
Push-in, push-in connection tool and pull-out connection in existing pipeline
After engaging with the tool, push-in connection tool or pull-out connection
Pull out the bundling tool and directly or indirectly
Cable that passes the connected cable through the existing pipeline
In the cable laying method, the connecting tool for pushing is circular.
It is provided integrally with the cylindrical fitting body and the front end face of the fitting body.
A plurality of hooks , and a wire rod having a connecting bracket rotatably held at a tip thereof. The plurality of hooks have different lengths and their hook portions.
Is positioned within the projected area in the axial direction of the bracket body with the
On the other hand, the fitting body of the engagement fitting is
The pull-out connecting tool is provided with a spherical head at a front end thereof, and a plurality of holes formed at intervals in an axial direction, and each hole of the metal fitting body. A receiving body consisting of a plurality of wires slidably inserted into each end and a ring formed at both ends, and a through rod having a connecting fitting rotatably held at a tip thereof, and a fitting main body of the receiving fitting. Are removably connected to the connecting fitting of the communication rod, and the hook of the engaging fitting in the connecting tool for pushing and the wire ring of the receiving fitting in the connecting tool for pulling are engageable. Connection tool used for cable laying method. 2. A connecting tool for pushing in from one end of an existing pipeline.
While pushing in, pull out the connecting tool from the other end of the existing pipeline.
Push-in, push-in connection tool and pull-out connection in existing pipeline
After engaging with the tool, push-in connection tool or pull-out connection
Pull out the bundling tool and directly or indirectly
Cable that passes the connected cable through the existing pipeline
In laying method of Buru, the push for connecting tool, after
A gun with multiple fins integrally provided on the outer peripheral edge of the end face
It is detachably connected to the elastic metal body and the rear end of the metal body.
It is composed of an engagement fitting made of a tied extension fitting , and a wire rod in which a connecting fitting is rotatably held at a tip end,
The extension bracket has an outer
Is formed in a diameter, larger length than the length of the fin
While the extension of the engagement fitting is
The pull-out connecting tool is provided with a spherical head at the front end and a plurality of holes formed at intervals in the axial direction of the fitting body and the fitting body. Each of the receiving fittings is slidably inserted into each of the holes, and includes a receiving fitting made of a plurality of wires each having a ring formed at both ends, and a communication rod at the tip of which a connecting fitting is rotatably held . The fitting body is
It is detachably connected to the connection bracket, and is used for the connection tool for pushing.
A fin of the engaging fitting and a wire ring of the receiving fitting in the drawing connecting tool can be engaged with each other. 3. A connecting tool the drawing, the diameter of the wire-passing rod predetermined length at the distal end of the wire-passing rod is connected, the coupling fitting to the distal end of the small diameter of the wire-passing rod is rotatably held, small diameter The metal fitting body of the receiving metal fitting is detachably connected to the connecting metal fitting of the wire rod.
A connecting tool used in the cable laying method described.