JP2981605B2 - Pipe caps for underground cables - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of a cap cord at the opening end of a cable conduit when a spare cord for passing a cable is passed by using compressed air supply in the work of passing an underground cable. The present invention relates to a pipe cap for a working line.

[0002]

2. Description of the Related Art Underground cables are laid and housed in conduits buried underground. In recent years, when laying new cables such as optical cables,
A line is accommodated using an existing cable conduit.

In such a new cable passing operation, first, a spare string for cable passing is inserted by using compressed air. That is, as shown in FIG. 6, a spare cord for wire (20) with a guide parachute (21) attached to the tip is used, and the tip of this spare cord (20) is connected to the cable conduit (P). By inserting and feeding compressed air from behind the parachute (21), the parachute (21) is blown off by the air pressure and the spare cord (20) is pulled in and inserted. Then, a new cable to be routed is connected to the spare string (20), and the spare string (20) is pulled in the next manhole to be wired.

At the time of this work, the existing cable pipeline (P)
Water and mud often accumulate due to long-term use, and water and mud flow back through the supply of compressed air and blow out from the opening of the cable conduit (P) in the work manhole. Your face and clothes. Unless the opening is closed, sufficient air pressure for pulling in the spare cord (20) cannot be obtained.

For this reason, generally, as shown in FIG. 7, a compressed air supply hose (22) connected to a compressor is used.
A wrap (33) is wound around the wire and a hose (32) for a line guide, and a wire (34) and an adhesive tape (3) are wound in the center.
5) Tighten with adhesive tape (3)
6) After stopping it so as not to move, it is pushed into the open end of the cable conduit (P) to close the opening, and in this state, a parachute is attached to the line guide hose (32). Compressed air is supplied through the spare cord (20).

However, as described above, the waste (3
3) is used because the working cable (C) is accommodated in the cable conduit (P), so that it is difficult to push the cable conduit (P) into the open end (P1) of the cable conduit (P). In addition, it cannot be closed well, and it is difficult to keep it in a closed state. There is a lot of air leakage from around the waste cloth, and there is a possibility that backflow water, mud, and the like may be ejected backward. In addition, it is necessary to attach the waste (33) with the compressed air supply hose (31) and the hose for the line guide (32) as a core every time the line is inserted, which is troublesome. In addition, there is also a problem that the waste (33) is easily damaged and needs to be replaced if it is used several times.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been made in consideration of the above, and has been made in consideration of the work of passing underground cables, in particular, the purpose of passing new cables such as optical cables through existing cable conduits in which working cables are accommodated. In the wire work, when inserting the spare cord for the wire using compressed air, the open end of the pipeline can be easily and conveniently closed regardless of the presence of the working cable, and the efficiency of the wire work is improved. It is an object of the present invention to provide a line work pipe cap which can be designed.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a pipe cap used to feed compressed air to a cable pipe in the work of passing an underground cable, and a tip of a hose for feeding compressed air. Is provided from the rear end side, is attached to the hose at the rear end, and is open to the front, and an operation gripping tube portion, and a cable tube extending from the tip end portion of the gripping tube portion A tubular insertion portion to be inserted into the opening end of the road, and a flange portion provided on the outer periphery of the rear portion of the tubular insertion portion and abutting on a pipe end face; A passing portion for passing a working cable is provided in a part of the outer periphery extending over the holding tube portion, and a through hole is provided in a portion of the holding tube portion, and the passing portion of the working cable includes the cylindrical insertion portion. Part is cut out and a flexible bullet is inserted so as to cover the notch. Sheet is attached consisting of wood, the deformed inwardly and the working cable characterized by comprising resiliently provided so as to be embraced by the working cable.

[0009] This line work pipe cap is used, for example, for supplying compressed air in a line work for passing a new cable through an existing cable pipe in which the working cable is accommodated. The gripping tube is gripped, the cylindrical insertion portion at the tip is inserted into the open end of the cable conduit, and the flange is used so as to be pressed against the end of the conduit.

[0010] At this time, the passing portion provided on a part of the outer circumference extending from the cylindrical insertion portion to the flange portion and the gripping tube portion is positioned with respect to the working cable housed in the conduit so that the working cable is used. Regardless of the presence of the cable, the tubular insertion portion can be fitted into the opening end of the conduit without any problem, and the flange portion can be abutted on the end face of the conduit.

In particular, in the cylindrical insertion portion of the passage portion of the working cable, a sheet of a flexible elastic material adhered so as to cover the cutout portion is deformed inward by the working cable to be in use. The cable will be elastically held, so that the portion can be well held in a sealed state.
In addition, since the operation can be performed by holding the gripping cylinder, the opening end can be easily held in a state in which the opening end is closed as described above.

[0012] First, compressed air is fed into the pipeline from a compressed air feeding hose connected to the compressor in a state in which the through-hole in the gripping cylinder is closed with a finger.
Drain water in the pipeline, then pass the spare cord through which the guide parachute is attached at the tip through the wire hole, and send compressed air to fly the parachute and draw in the spare cord. Insert it. At this time, the open end of the conduit is properly closed by the conduit cap irrespective of the presence of the working cable. In particular, the passage portion of the outer working cable on the outer periphery is kept in a sealed state. Air leakage from the surroundings is small, and the spare cord can be efficiently inserted. Also, even if water or mud may flow backward, the flange portion prevents ejection to the rear,
There is no danger to workers.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal end view of a pipe cap (A) according to the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is a sectional view taken along line XX of FIG.

In FIG. 1, reference numeral (1) denotes a pipe cap through which the distal end of a compressed air supply hose (2) connected to the compressor is inserted and attached to the distal end.

The pipe cap (1) has an operation gripping cylinder (3) having a tapered cylindrical shape with a smaller diameter toward the rear end and opening forward, and a distal end of the gripping cylinder (3). A tubular insertion portion (4) which is further extended and fitted into the opening end (P1) of the cable conduit (P), and is provided on the outer periphery of the rear portion of the tubular insertion portion (4) and is provided at the end of the conduit. A substantially cup having a flange portion (5) to be brought into contact with and being integrally formed mainly of a relatively hard and moderately elastic rubber or synthetic resin as a main material and opening toward the tip as a whole. It is in a state. Although it is not impossible to form it from other materials such as metal, the rubber material and the synthetic resin material are preferable from the viewpoints of easiness of manufacture and handling and protection of cables and conduits. In addition, it is possible to easily cope with a slight error in the inner diameter of the pipeline by elastic deformation.

The gripping cylinder (3) is not limited to a tapered shape as shown in the figure, but may be formed in another grippable cup shape or cylindrical shape.

The cylindrical insertion part (4) has an outer diameter slightly smaller than the inner diameter of a generally used cable conduit (P), and the outer diameter of the flange part (5) is smaller than the diameter of the pipe. The pipe (P) is formed to have a slightly larger diameter than the outer diameter of the pipe forming the pipe so that the end face of the pipe (P) can be reliably contacted.

At a part of the outer circumference extending from the cylindrical insertion portion (4) to the flange portion (5) and the gripping tube portion (3), a passage portion (6) for passing the working cable (C) is provided. Is cut out and partially recessed inward.

In particular, when the tubular insertion portion (4) is inserted into the pipe (P) as the passage portion (6), the working cable (C) can be passed with as little air leakage as possible. It is desirable that the gap between the cable and the working cable (C1) be as small as possible. Therefore, as in the embodiment shown in the figure, a part of the main material such as a hard rubber material in the cylindrical insertion portion (4) is cut out, and a sheet (7) made of a soft elastic material such as soft rubber or soft synthetic resin is formed. The cylindrical insertion portion (4) so as to cover the notch (8).
The flexible elastic material sheet (7) attached to both inside and outside
Is deformed inward by the working cable (C), so that the working cable (C) is elastically held, the portion can be held in a sealed state, and air leakage can be reduced. Is good.

In place of the sheet (7), the sheet (7) may be formed so as to be deformable with another soft elastic material.

Reference numeral (9) denotes a through hole provided in a side wall of the gripping tube (3), for example, which is opposed to the passage (6) of the working cable (C). As shown in the figure, the through hole (9) is opened on the side surface of the gripping tube (3) so as to be substantially in the front-rear direction.
And low insertion resistance of the new cable. A reinforcing ring (9a) made of a material having good abrasion resistance is attached to the periphery of the through hole (9) in order to prevent abrasion damage due to insertion of a spare cord or cable. Particularly preferred.

As means for attaching the pipe cap (1) having the above structure to the hose (2) for feeding compressed air, for example, the front end of the hose (2) may be attached to the rear end side of the gripping cylinder (3). In a more penetrated state, in addition to fixing and attaching the hose (2) to the hose (2) inside and outside of the rear end portion (10) using a fixing means (11) using an adhesive or an adhesive tape, etc. It is possible to implement by attaching means, and it is also possible to detachably attach by means of a screw fastening means such as a coupling or a nut. In any case, it is preferable that the fixing portion is attached so that the fixed portion keeps the sealed state in the attached state. The end of the hose (2) may be extended forward from the pipe cap (1) as shown in the figure, or may be terminated inside the pipe cap (1), for example, near the rear end. You can keep it.

The pipe cap (1), which is constructed as described above and is attached to the distal end of the compressed air supply hose (2) connected to the compressor, as shown in FIG. It is used as follows in the wiring work for passing the new cable (C) through the existing cable conduit (P) in which the cable (C) is housed.

[0025] The gripping tube portion (3) for operation is gripped, and the cylindrical insertion portion (4) at the end is opened at the open end (P) of the cable conduit (P).
If it is pushed in so as to fit in 1), the flange (5) is pressed against the pipe end face.

At this time, the passing portion (6) provided on a part of the outer periphery extending from the cylindrical insertion portion (4) to the gripping tube portion (3).
Can be inserted into the open end (P1) of the pipeline (P) without any problem by aligning the tubular insertion part (4) with the working cable (C) housed in the pipeline (P). In addition, the flange portion (5) can be conveniently and easily abutted against the end face of the pipeline, and thereby the opening of the pipeline (P) can be closed properly. That is, the working cable (C) has a notch (8) provided in the tubular insertion portion (4).
Elastically held by a sheet (7) made of a flexible elastic material for shielding the cable, so that the passage portion of the cable can be maintained in a sealed state.

Further, if the pipe (P) is formed of a rubber material having an appropriate elasticity, even if the inner diameter of the pipe (P) is slightly smaller than the outer diameter of the cylindrical insertion portion (4), the cylindrical pipe (P) may be inserted into the pipe (P). It can be pushed in by utilizing the elastic deformation of the portion (4), and even if the inner diameter of the conduit (P) is slightly larger, the flange portion (5) abuts on the end face of the conduit (P). By doing so, the opening can be closed.

In this way, first, compressed air is fed into the pipe (P) from the end of the hose (2) while the through-hole (9) of the gripping cylinder (3) is closed with a finger. After draining the water in the pipe (P), as shown in FIG. 4, a spare string (20) having a guide parachute (21) attached to the end thereof is passed through a wire hole (9). By feeding compressed air in the same manner as described above, the loose chute (21) is skipped, and the spare cord (20) is pulled in and inserted.

At this time, the open end (P1) of the pipe (P)
Since the cable is closed by the conduit cap (1) regardless of the presence of the working cable (C), there is little air leakage from around the conduit cap, and the spare cord (20) can be inserted efficiently. it can. Even if water or mud flows backward, the rearward jetting is prevented by the flange portion (5), so that there is no possibility that the water or mud may be applied to the worker.

[0030]

As described above, according to the pipe cap for working of the present invention, a connecting cable for connecting a new cable such as an optical cable to an existing cable pipe in which a working cable is accommodated. In the operation, the pipe cap attached to the end of the compressed air supply hose is inserted into the end of the pipe by a simple operation of inserting the cylindrical insertion section and pressing the flange section, Irrespective of the presence, the cable can be passed and the open end of the pipe can be closed properly, and the spare string can be efficiently and easily inserted by sending compressed air. Even if there is a backflow, there is no possibility that it will blow to the operator because it does not blow backward. Therefore, the wiring work can be easily and efficiently performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a conduit cap according to the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a schematic sectional view showing a state in which a conduit cap is inserted into a conduit opening.

FIG. 5 is an enlarged sectional view when a spare string is inserted.

FIG. 6 is an explanatory diagram of a state of a working route in an underground cable conduit.

FIG. 7 is an enlarged sectional view of a part when compressed air is supplied.

[Explanation of symbols]

 (1) Pipe cap (2) Compressed air supply hose (3) Grip tube (4) Cylindrical insertion part (5) Flange (6) Passage of current cable (7) Flexible elastic material sheet ( 8) Notch (9) Cable for communication (10) Rear end (11) Fixing means (20) Spare cable for communication (P) Cable conduit (P1) Open end (C) Current cable

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshio Okina 1-2-19 Keida, Habikino-shi, Osaka Kansai System Maintenance Co., Ltd. (56) References JP-A-7-67224 (JP, A) JP-A-3 −36909 (JP, A) Japanese Utility Model 3-1612 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02G 1/06-1/08 H02G 9/00

Claims (1)

(57) [Claims] 1. A pipe cap used for supplying compressed air to a cable conduit in an underground cable passing operation, wherein a distal end portion of a compressed air supply hose is penetrated from a rear end side. An operating gripping tube attached to the hose at the rear end and opening forward; a tube extending from the distal end of the gripping tube and fitted into the open end of the cable conduit Current insertion cable, and a flange portion provided on the rear outer periphery of the cylindrical insertion portion and abutting against a pipe end face, and a working cable is provided on a part of the outer periphery extending from the cylindrical insertion portion to the flange portion and the gripping cylinder portion. with passage section is provided to pass, will be the wire-passing hole provided in a part of the grip tube portion, passing part of the current cable, a portion of the tubular insertion portion
Flexible elastic so that it is cut out and shields the notch
Sheet made of material is adhered and
Is provided so that it can be elastically hugged
A pipe cap for underground cable passage work, characterized in that it is provided.