JPH1141736A - Chuck-type multitube pulling device for cable protective tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pull a group of a number of cable protective tubes W, which are allowed to install in accordance with the inner diameter of an underground conduit together and install a number of the cable protective tubes efficiently. SOLUTION: A chuck-type multitube pulling device Z has a pulling jig for a group of a number of cable protective tubes W by assembling, unifying and fixing a number of chucking means (1, 1a, 3, 4a and 4b) which are the main holders of chuck-type cable protective flexible tube pulling eyes. A number of the chucking means are housed and fixed in a semicylindrical or cylindrical tip metal fitting 8. The plate pushing-in part 1a of the pulling bolt 1 which is a component of each chucking means is pushed in between a pair of tapered chuck plates 4a and 4b, or in order to release the pulling bolt 1, a tightening nut 5 and a tightening handle 10 are provided on the pulling side end of the pulling bolt 1. A pulling plate 9 is provided between the pulling side end surface of the tip metal fitting 8 and the tightening nuts 5, and a pulling hook 7 is attached to the pulling plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction jig for laying a large number of cable protection tubes for accommodating a communication cable before laying the communication cable in a steel pipe underground conduit. Flexible tube for cable protection type A cable protection tube in which a large number of chucking means, which are the main body of the pulling eye, are assembled, integrated and fixed, and a large number of cable protection tube groups are pulled at one time to lay multiple wires. And a chuck-type multi-row traction device. The cable protection tube is generally a non-flexible φ75 mm tube, and is represented by a VU tube described later.

[0002]

2. Description of the Related Art Conventionally, when an optical cable is newly added to an existing small-diameter optical cable accommodating conduit, a high-density polyethylene cable protecting flexible tube is first laid and the optical cable is accommodated therein. I've been trying to do that.

[0003] The existing small diameter optical cable accommodating conduit generally uses a φ75 mm tube, and up to three optical cables can be laid in the tube. Therefore, two flexible pipes for protecting the cable may be newly laid.

[0004] In this laying operation, a hole is drilled in the vicinity of the end of the mouth of the flexible tube, and a cable tie is passed through.
The towed end was made by putting a cable cap, wrapping vinyl tape, fixing the back strap to the metal, and fixing the strap.

[0005] However, there is a drawback that the operation takes a long time, and the towing end is broken during towing, and the cable ties are detached or cut.

In order to solve the above-mentioned drawbacks, the applicant of the present invention inserts a flexible tube for protecting a cable into a chuck means and clamps it, thereby eliminating the necessity of manufacturing a towing end and making it extremely simple and quick. -Flexible tube pooling eye for chuck type cable protection that can be laid, easy to remove when completed, and improves workability [Japanese Patent Application No. 8-104558]
No .; ] Has been proposed.

As shown in FIG. 9, the prior application apparatus has a chuck means (a main body for holding) for holding the periphery of the mouth end of the flexible tube (X) for protecting the cable. That is, the components of the chuck means are a guide sleeve (3), a pair of tapered chuck plates (4a, 4b), and a traction bolt (1) having a tapered plate press-fit portion (1a).

On the other hand, in the construction work of underground pipes for housing communication cables including optical cables, in recent years, the construction method has been excavating (cutting) the road surface and burying the pipes. It has been shifting to the non-drilling method (propulsion method).
A steel pipe is propelled and laid, and 5 to 27 hard vinyl chloride φ75 mm cable protection pipes (hereinafter referred to as VU) are provided in the steel pipe.
tube. ), And various communication cables are accommodated and laid in each VU pipe.

[0009] Here, there is a constructional demand for efficiently laying multiple VU pipes in a steel pipe.

[0010] As shown in Fig. 10, a known traction jig for laying multiple VU pipes has a rubber swelling stopper (hereinafter referred to as a known device) inserted and fixed for each VU pipe. The number of stopper ends was fixed and fixed to the tip metal fitting, and the stopper was pulled.

[0011]

However, the known device has the following problems.

(1) When fixing the device to the VU tube, the nut must be strongly tightened to swell the rubber.

(2) In this case, when the rubber swells, V
Since the U tube rotates, it cannot be fixed unless the VU tube is strongly held.

(3) Since the tightening (force) of the nut in each VU pipe is not constant, it may come off during towing.

(4) After the fixing of the device to the VU tube is completed, it takes time to fasten and fix the device to the tip fitting.

(5) After the completion of the laying, it takes time to remove the device from the VU tube following the release from the metal fitting.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to solve the above-mentioned problems and to constitute a traction jig in which a large number of chuck means of the prior application device are assembled, integrated and fixed. Accordingly, the present invention provides a chuck-type multi-row pulling apparatus for a cable protection pipe in which VU pipe groups for the number of pipes permitted according to the inner diameter of the underground pipe are pulled at a time and laid in multiple rows.

[0018]

SUMMARY OF THE INVENTION In order to solve the problem, the present invention provides a plurality of chuck means, which are a main body for clamping a flexible tube pulling eye for protecting a chuck-type cable, and integrally integrates and fixes them. And a chuck type multi-row pulling device for a cable protection tube comprising a pulling jig for the VU tube group of (1), wherein a large number of the chuck means are housed and fixed in a semi-cylindrical or cylindrical tip fitting, and In order to press-fit the plate press-fitting portion of the traction bolt between the pair of tapered chuck plates, or to release it, a tightening nut and a tightening handle are extended at one end on the traction side of the traction bolt, and the tip metal fitting is provided. A traction plate is interposed between the traction side end face and the tightening nut, and a traction hook is attached to the traction plate, so that the number of VU pipe groups corresponding to the number of laying lines allowed according to the inner diameter of the underground conduit. It is characterized in that the traction and was adapted to multi-start laying a time.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a peripheral edge of a VU pipe is inserted between a guide sleeve and a tapered chuck plate, and a traction bolt having a plate press-fitting portion is fastened from the traction side. Chuck means for clamping by press-fitting between the tapered chuck plates, and a semi-cylindrical or cylindrical tip metal fitting for accommodating and fixing a large number of the chuck means and inscribing the underground pipe to form a towing frame. The plate press-fitting portion of the traction bolt is extended between one end of the traction bolt, and a traction plate is interposed on the traction-side end surface of the tip metal fitting to fasten the plate press-fit portion of the traction bolt between the pair of tapered chuck plates. And a traction hook attached to the traction plate.

Here, it is preferable that a plurality of guide rollers are semi-sinked on the outer cylinder wall of the tip fitting and inscribed in the underground conduit.

The number of chucking devices to be accommodated is the number (5 to 27) of cable protection tubes allowed according to the inner diameter of the underground pipeline. Further, the arrangement allows for dense arrangement of VU tubes in the cross section of the tip fitting.

The components of the chuck means are a guide sleeve, a pair of tapered chuck plates, and a traction bolt (1) having a tapered plate press-fitting portion (1a). The structure is the same as that of the chuck means which is the main body for clamping in the flexible tube pulling eye.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. In each drawing, the same reference numerals are given to components common to the prior application (FIG. 9).

FIG. 1 is an assembly explanatory view showing the configuration of the apparatus according to the embodiment.

FIG. 2 is a partial sectional view in plan view of the apparatus of the embodiment.

As shown in the figure, a guide sleeve (3) into which VU pipes (W) for the number of laying tubes can be inserted is attached to the tip fitting (8). On the inner surface, press-fit part (1
A pair of tapered chuck plates (4a, 4b), which are formed in a tapered shape so that a) bites, are provided so as to be movable in the diameter direction.

Preferably, a plurality of guide rollers (81) are semi-sinked on the outer cylinder wall of the tip fitting (8) so as to be inscribed in the underground pipe.

A towing plate (9) provided with a towing hook (7) is provided in front (towing side) of the tip fitting (8), and the guide sleeve (3), tip fitting (8) and towing plate (9) are provided. , A traction bolt (1) is mounted, and a clamping nut (5) and a clamping handle (10) are provided at the leading end of the traction bolt (1) on the traction side.

Next, the use state of the device of the present invention will be described together with the working procedure.

As shown in FIG. 3, the VU tube (W) is inserted between the guide sleeve (3) and the tapered chuck plates (4a, 4b).

Here, the pair of tapered chuck plates (4a, 4b) can be inserted smoothly because they are slackened in the diameter direction (the sectional direction shown in the drawing). 〔attachment〕

As shown in FIG. 4, the plate press-fitting portion (1a) of the traction bolt (1) is formed by a tapered chuck plate (4a, 4).
b) Pull the tightening handle (10) so that it bites in between, and manually tighten the tightening nut (5). After the temporary tightening, retighten with a spanner or the like. [Holding]

Here, the tapered chuck plate (4a, 4
The inner surface of the mouth end of b) is formed in a tapered shape so as to induce the biting of the plate press-fitting portion (1a).
Further, in order to increase friction with the inner surface of the VU tube (W), sharp ridges are formed on the outer surface of the mouth end in a direction (peripheral direction) perpendicular to the longitudinal direction to secure the clamping. It is assumed.

As shown in FIG. 5, when the installation of each VU pipe (W) to be laid is completed, a wire rope is attached to the towing hook (7) and the towing into the underground pipe (steel pipe) not shown is started. I do. (Towing)

As shown in FIG. 6, the device (Z) of the present invention reaches the other end (end) of the underground pipe (steel pipe) not shown.
When the towing is completed, the tightening nut (5) is first loosened.
(Release)

Next, as shown in FIGS. 7 and 8, the head of the tightening handle (10) is hit with a hammer or the like, and the plate press-in portion of the traction bolt (1) biting into the tapered chuck plate (4a, 4b). Remove (1a). Thus, the clamping of the VU tube (W) can be released. And the device of the present invention (Z)
Pull out and remove. 〔removal〕

[0037]

The present invention has the above-mentioned structure, and according to the present invention, a large number of VU tube groups can be pulled at one time and laid in multiple underground pipes.

Further, since it can be mounted by simple operation and can be easily removed as compared with the known device, workability is improved and work time is greatly reduced.

[Brief description of the drawings]

FIG. 1 is an assembly explanatory view showing a configuration of an embodiment apparatus.

FIG. 2 is a partial sectional view of the same plan view.

FIG. 3 is an explanatory cross-sectional view showing a use state [attachment].

FIG. 4 is an explanatory cross-sectional view showing a use state (holding).

FIG. 5 is an explanatory sectional view showing a use state [traction].

FIG. 6 is an explanatory cross-sectional view illustrating a use state (release of fastening).

FIG. 7 is an explanatory sectional view showing a use state [removal].

FIG. 8 is an explanatory sectional view showing a use state [removal].

FIG. 9 is an explanatory cross-sectional view showing a configuration of a prior application device (chuck-type cable protecting flexible tube pulling eye).

FIG. 10 is an explanatory cross-sectional view showing a configuration and a use state of a known device (a rubber swelling type stopper).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulling bolt (chuck means) 1a Plate press-fitting part (chuck means) 1b Ring for cable string 2 Plate clamp washer 3 Guide sleeve (chuck means) 4a Taper chuck plate (chuck means) 4b Taper chuck plate (chuck means) 5 Tightening Nut 6 Towing eye nut 7 Towing hook 8 Tip fitting (towing frame) 81 Guide roller 9 Towing plate 10 Tightening handle W VU tube (cable protection tube) X Flexible tube for cable protection Y Communication line Z

Claims (4)

[Claims] 1. A cable for use in laying multiple cable protection tubes for accommodating a communication cable in an underground conduit by pulling the cable before laying the communication cable in an underground conduit made of steel pipe. A chuck type multi-row pulling device for a cable protection tube comprising a large number of chuck means, which are the main body for clamping a flexible tube pulling eye for protection, integrated and fixed, and constituting a pulling jig for a plurality of cable protection tube groups. A large number of the chuck means are housed and fixed in a semi-cylindrical or cylindrical tip metal fitting, and a plate press-fitting portion of a traction bolt which is a component of the chuck means is press-fitted between a pair of tapered chuck plates, Or, in order to release this, a tightening nut and a tightening handle are extended at one end of the traction bolt on the traction side, and a traction plate is interposed between the traction side end face of the tip fitting and the tightening nut. In addition, a tow hook is attached to the tow plate, and a plurality of cable protection pipe groups, which are allowed according to the inner diameter of the underground pipeline, are towed at a time and are laid in multiple runs. Chuck type multi-row traction device for cable protection tube. 2. A zipper type cable used for laying multiple cable protection tubes for accommodating communication cables in an underground pipeline by pulling them prior to laying the communication cables in a steel pipe underground pipeline. A chuck type multi-row pulling device for a cable protection tube comprising a large number of chuck means, which are the main body for clamping a flexible tube pulling eye for protection, integrated and fixed, and constituting a pulling jig for a plurality of cable protection tube groups. By inserting the peripheral edge of the mouth end of the cable protection tube between the guide sleeve and the tapered chuck plate, fastening the traction bolt having the plate press-fitting portion from the traction side, and press-fitting between the pair of tapered chuck plates. A clamping means for clamping, a semi-cylindrical or cylindrical tip metal fitting for accommodating and fixing a large number of the above-mentioned chuck means, inscribed in an underground conduit, and constituting a traction frame; Extending to one end of the traction bolt,
A tightening nut and a tightening handle for press-fitting the plate press-fitting portion of the traction bolt between the pair of tapered chuck plates or by releasing the bolt by fastening the bolt with a traction plate interposed on the traction side end surface of the tip fitting. A tow hook attached to the tow plate, a cable protection tube group for the number of laying lines allowed according to the inner diameter of the underground pipeline, tow at a time, and to lay multiple strips. Chuck type multi-row traction device for cable protection tube to be changed. 3. The chuck-type multi-row traction apparatus for a cable protection tube according to claim 1, wherein a plurality of guide rollers are semi-sinked on the outer cylinder wall of the tip fitting. 4. The number of installed chuck means is 5 to 27, the number of cable protection pipes being allowed according to the inner diameter of the underground pipe, and is semi-cylindrical or cylindrical. The chuck-type multi-row traction device for a cable protection tube according to claim 1 or 2, wherein the cable protection tube group is arranged so as to be densely arranged in a cross section of the shape of the tip metal fitting.