JPH08280123A - Water stopping device for cable conduit opening - Google Patents

Abstract

PURPOSE: To facilitate installation work without damaging a sheath or degrading water stopping capability by providing a cylindrical plug of an elastic body the outside diameter of which is almost equal to the diameter of a cable conduit opening, and which has in its central portion an insertion hole almost equal in size to the outside diameter of a cable and has in its solid portion a key way into which a key is to be forcedly inserted to secure it in the conduit. CONSTITUTION: The outside diameter of a cylindrical plug 1 having rubber-like elasticity is almost equal to the diameter of a cable conduit opening. The plug 1 has in its central portion a cable insertion hole 4 the diameter of which is equal to the outside diameter of a cable and which runs in the direction of the axis of the conduit. The plug 1 also has in its solid portion 1a a cut 5 and at least one key way 2 running in the direction of the axis of the conduit in order to insert a cable into the insertion hole 4 from outside. A key 3 is forcedly fitted in the key way 2, and the cylindrical plug is thereby secured in the conduit opening. Thus the cable can be simply moved within the cylindrical plug 1, which eliminates the possibility of degrading water stopping capability and damaging cable sheaths. This facilitates installation work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable conduit waterproof device.

[0002]

2. Description of the Related Art Cables such as underground power transmission lines are laid in a conduit buried in the ground, and the conduit is connected to the conduit and a manhole installed in the middle of the conduit. , A waterproof device is installed. The installation of the waterproof device closes the conduit opening around the cable and prevents water leakage from the conduit into the manhole.

Conventionally, as such a waterproof device, there are generally known ones having the following structures a to c, but all of them have the following problems.

A. With a structure that is waterproofed by a foaming injection material (i) It is difficult to use in a place with a lot of water leakage.

(Ii) Decrease in water blocking effect due to shrinkage after curing.

(Iii) The work process is complicated.

(Iv) Many of them have strong adhesiveness and are difficult to remove for repairs.

B. With a structure that is waterproofed by cement clay (i) Since there is no followability to the movement of the cable, there is a possibility that the water blocking effect will decrease when the cable is moved, and the cable jacket may be damaged depending on the hardness of the cement clay. is there.

(Ii) It is difficult to use in a place where there is a lot of water leakage.

C. Mechanically tightened elastic waterproof material (i) The cable has a high holding property and cannot follow the movement of the cable.

(Ii) Since it is necessary to evenly tighten the periphery of the end face, the number of constituent parts increases and the mounting is troublesome.

(Iii) Since the number of metal parts is inevitably increased due to the necessity of tightening, there is concern about the safety of the cable jacket.

The present invention has been made for the purpose of eliminating such conventional problems.

[0014]

DISCLOSURE OF THE INVENTION According to the present invention, an outer diameter of a cable is approximately corresponding to an inner diameter of a cable passage opening, and a central portion is provided with a cable insertion penetrating in a pipe axial direction with a diameter substantially corresponding to the outer diameter of the cable. It has a tubular plug with rubber-like elasticity, which has a hole,
The thick portion of the stopper is provided with one notch for inserting the cable from the outside into the insertion hole and at least one key groove penetrating in the tube axial direction. According to a waterproofing device for a cable conduit opening, the groove is provided with a key for fixing the plug in the conduit by forcibly fitting into the key groove.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to the accompanying drawings.

As is apparent from the exploded view shown in FIG. 1, the waterproof device of the present invention is capable of being forcibly fitted into a cylindrical plug 1 having a key groove 2 in a thick portion 1a and a key groove 2 of the plug 1. Key 3 is provided as a component.

The cylindrical plug 1 is for sealing a peripheral space c between the cable conduit opening a (see FIG. 4) and the cable b inserted in the conduit conduit a, and is made of natural rubber. Molded from a rubber-like elastic material such as synthetic rubber, water-swellable one is particularly preferable.

The plug 1 has an outer diameter substantially corresponding to the inner diameter of the conduit opening a, for example, an outer diameter substantially equal to or slightly larger than the inner diameter. Further, the central portion is provided with a cable insertion hole 4 penetrating in the tube axial direction with a diameter substantially corresponding to the outer diameter of the cable b, for example, a diameter substantially equal to or slightly smaller than the outer diameter.

As shown in FIG. 1, the cable insertion hole 4 may be provided at the center of the tubular plug 1, or may be provided at an eccentric position as described in detail below.

A cable b is attached to the thick portion 1a of the tubular plug 1.
For inserting the plug into the insertion hole 4 of the spout 1 from the outside.
Two cuts 5 are formed. The position where the cut 5 is formed is not particularly limited, and FIG. 1 shows the case where the cut 5 is formed horizontally at the center height position.

At least one key groove 2 penetrating in the tube axis direction is formed in the thick portion 1a of the tubular plug 1.

In FIG. 1, in an upper region of the thick portion 1a within 360 °, that is, in a portion where the gravity of the cable b is not received when the cable is installed in the conduit opening a, one circular arc shape concentric with the insertion hole 4 is formed. Although the case where the key groove 2 is formed is shown, the shape, the number of the key grooves 2 and the position of the key grooves 2 are not particularly limited.

A key 3 is provided in the key groove 2 of the spout 1. The key 3 is for fixing the tubular plug 1 in the conduit opening a by forcibly fitting it into the key groove 2, and has a cross-sectional shape that is substantially the same as or slightly larger than the key groove 2. ing.

The operation of inserting the key 3 into the key groove 2 may be performed from the inside of the pipe toward the outside of the conduit opening a, or conversely, from the outside of the conduit opening a toward the inside of the conduit opening a. In FIG. 1, the former case is shown, and two rods 6 made of a hard material such as a pulling member, such as metal, are attached and fixed in parallel to the key 3. Rods 6 and 6 are keyways 2
It is pulled out to the outside through the inside, and the bent portion 6a,
A grip portion 7 made of 6a is formed. Rod 6,6
Is detachably attached and fixed to the key 3 at the base end side by applying a screw coupling means (not shown).

Inclination guide portions 8 for guiding the fitting into the key groove 2 can be formed on both side portions of the key 3 on the front end side.

2 to 5 schematically show the procedure for constructing the waterproof device of the present invention. FIG. 2 shows the state of the process of attaching the tubular plug 1 to the cable b, and the plug 1 has a cut 5
Push open and manhole in cable b (not shown)
The part passing through the inside is fitted from the outside.

Next, as shown in FIG. 3, a key 3 is installed on the inside of the spigot 1 in the tube axial direction, and the two rods 6 and 6 provided on the key 3 pass through the key groove 2 to the outside. Be withdrawn.

Next, in the state shown in FIG. 3, the liner key 1 of the cylindrical plug 1 is moved along the cable toward the conduit opening a side, and the cylindrical plug 1 is placed inside the conduit opening a as shown in FIG. Be fitted to.

At the time of this fitting operation, the cylindrical plug 1 can be deformed in the direction of decreasing the outer diameter at the portion of the key groove 2 against the resilience, so that the outer diameter of the plug 1 is the pipe opening a. This can be easily done not only when the inner diameter is substantially equal to the inner diameter, but also when the inner diameter is slightly larger than the inner diameter.

When the pipe port a is capped with the above-mentioned plug 1, the water level in the pipe line a ₁ may rise to near leakage depending on construction conditions. In such a case, drainage from the keyway 2 Since it can be done, it can be installed without trouble even in a place with a lot of water leakage. By the way, if the water cannot be drained, the tubular plug 1 is pushed from the conduit port a by the water pressure from the back side, which makes the construction difficult.

In the state shown in FIG. 4, the key 3 is attached to the rods 6 and 6.
By forcibly pulling and fitting into the key groove 2 by performing an external operation by, the cylindrical plug 1 can be firmly tightened and fixed in the conduit opening a as shown in FIG.

There are two conceivable outer diameters of the tubular plug 1, that is, the outer diameter is approximately equal to the inner diameter of the conduit opening a, and the outer diameter is slightly larger than this.

In the former case, a key 3 having a shape slightly larger than the keyway 2 is used to measure the volume expansion of the tubular plug 1, and in the latter case, the key 3 is used as the keyway 2. By using the same shape as the one described above and forcibly restoring the tubular plug 1 toward the original shape, the tubular plug 1
Can be strongly crimped to the inner peripheral surface of the conduit opening a on the outer peripheral surface side and to the outer peripheral surface of the cable b on the inner peripheral surface side, and the plug 1 is tightened into the conduit opening a by the key 3. Can be firmly fixed.

As shown in FIG. 5, the cylindrical plug 1 is tightened by the key 3 which is forcibly fitted into the key groove 2 of the thick portion 1a, and on the outer peripheral surface side, on the inner peripheral surface of the conduit opening a, Further, since the inner peripheral surface side is strongly crimped to the outer peripheral surface of the cable b, a high degree of water blocking effect can be obtained. Moreover, it is excellent in pressure resistance and can sufficiently withstand the pressure in the pipeline, for example, the groundwater pressure.

The cable b is a rubber-like elastic cylindrical plug 1.
Therefore, it can be easily moved in the tubular plug 1. Therefore, when the cable b expands or contracts due to temperature changes or is vibrated due to an earthquake or the like, this can be dealt with by moving the cable b inside the spigot 1, and the jacket of the cable b is damaged or stopped. There is no loss of water.

To replace the waterproof device of the present invention with a new one, operate the rods 6 and 6 in the state shown in FIG.
By pulling out the key 3 from the key groove 2 and releasing the tubular plug 1 from tightening the key 3, the tubular plug 1 can be easily and easily removed from the inside of the conduit opening a. By the way, the rods 6 and 6 may be removed from the key 3 at the base end screw connection portion after the waterproof device is installed and stored, and in the case of replacement, may be attached to the key 3 again by screw connection. The key 3 may be pulled out either inward or outward from the conduit opening a.

Of the waterproof device of the present invention installed at both ends of the conduit between the manhole and the next manhole,
When one side is removed, the water staying in the pipeline flows out toward the one side, and as a result, the inside of the pipeline becomes decompressed. Due to this decompression, the waterproof device installed at the conduit opening on the other side may be sucked into the conduit and difficult to remove. In order to prevent such suction movement, as shown in FIG. 6, rods 6, 6 are provided on the outer end side of the key 3 of the other side waterproof device.
Alternatively, the stopper member 9 can be attached using the screw holes for attaching the rods 6 and 6. The stopper member 9 is locked to the mouth end surface of the conduit opening a and prevents further suction movement of the waterproof device.

Since the depressurization in the pipeline will eventually be canceled and the pressure will return to normal pressure, after returning to normal pressure, the waterproof device on the other side may be removed from the pipeline opening by the procedure described above.

In a cylindrical plug 1 of the type shown in FIG.
Since the thick portion 1a has the same thickness over the entire 360 ° range, when the plug 1 is installed in the conduit port a, the lower region of the thick portion 1a receives the load of the cable b. It may be compressed and deformed. In order to prevent such compressive deformation,
As shown in FIG. 7, a spacer 10 made of a hard material such as hard rubber can be embedded in the lower end region of the thick portion 1a.

In the present invention, the cable insertion hole 4 of the tubular plug 1 is replaced with the concentric type shown in FIGS.
It may be formed at an eccentric position as shown in FIG. In this case, the key groove 2 is formed in the thicker region 1a ₁ of the uneven thick portion 1a.

FIG. 8 shows an arcuate key groove 2.
9 to 11 show the case where one to three circular shaped plugs are provided, and the cylindrical plug 1 is installed in the illustrated orientation. FIG. 12 shows a cylindrical plug 1 applied to a three-phase twisted cable b ₁ , and the plug 1 has an insertion hole 4 having a shape that substantially matches the cross-sectional shape of the cable b _1. The structure is the same as that of FIG. 1 except that it is formed.

In the case of the three-phase stranded cable b, since a triangular void d is formed at the center, a spacer packing 11 is filled in the void d at a portion to be tightened by the tubular plug 1. It As the packing 11, for example, a string-shaped packing made of rubber or other water-swellable fiber or a putty-shaped injection material can be used.

In the present invention, at least one side of the key groove 2 and the key 3 can be provided with a taper in the fitting direction of the key 3.

[0044]

According to the present invention, the following effects can be obtained.

(A) Since the number of constituent parts is small and the construction is easy, the construction time can be shortened and the construction cost can be reduced.

(B) Since the water can be drained from the keyway 2, it can be applied to a leaking point without any trouble.

(C) Since it can be easily removed from the conduit opening, it can be easily repaired. D) Since the cylindrical plug has rubber-like elasticity, it does not damage the jacket of the cable b.

(E) Since the tubular plug has rubber-like elasticity and is not so strong in restraining the cable, the cable can be easily moved within the tubular plug, and due to this mobility, expansion and contraction due to temperature change of the cable. This eliminates the risk of water cutoff and damage to the cable jacket, which is a concern due to movement and vibration during earthquakes.

[Brief description of drawings]

FIG. 1 is an exploded view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a situation when a tubular plug is attached to a cable.

FIG. 3 is a perspective view showing how the tubular plug and the key are attached to the cable.

FIG. 4 is a vertical cross-sectional view showing a state in which a tubular plug is fitted into a conduit opening.

FIG. 5 is a vertical cross-sectional view showing a state in which the tubular plug is key-fastened in the conduit opening.

FIG. 6 is a vertical cross-sectional view showing a state in which a key is provided with a suction movement preventing stopper.

FIG. 7 is a front view showing a situation in which a spacer is embedded in a tubular plug of the type shown in FIG.

FIG. 8 is a front view showing an example of an eccentric type tubular plug.

FIG. 9 is a front view showing another example of the same.

FIG. 10 is a front view showing still another example of the same.

FIG. 11 is a front view showing still another example of the same.

FIG. 12 is an explanatory view seen from the front side showing an example of a tubular plug applied to a three-phase twisted cable.

[Explanation of symbols]

 1 Cylindrical Plug 2 Key Groove 3 Key 4 Cable Insertion Hole 5 Cut 6 Rod 7 Grip 8 Guide Part 9 Stopper Member 10 Spacer 11 Spacer Packing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Clan, 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor, Mamoru Fukai 3-3, Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 in Kansai Electric Power Co., Inc. (72) Inventor Tomosumi Takasaki 3-3 Nakanoshima, Kita-ku, Osaka-shi, Osaka Prefecture No. 22 Inside Kansai Electric Power Co., Inc. (72) Akira Matsuda 2-Honjo-Higashi, Kita-ku, Osaka-shi, Osaka 3-41 No. 41 Kindennai Co., Ltd. (72) Inventor Masao Nakayama 2-3-3, Honjo-Higashi, Kita-ku, Osaka-shi, Osaka Prefecture No. 41 Kindennai Co., Ltd. (72) Ryota Uga 7-Baizashi-cho, Tennoji-ku, Osaka-shi, Osaka No. 6 Incorporation company in Osaka waterproofing construction (72) Inventor Katsuhisa Minami No. 7 Eizo-cho, Tennoji-ku, Osaka city Osaka Prefecture Incorporation company in Osaka waterproofing construction company

Claims (6)

[Claims] 1. A rubber-like elasticity having an outer diameter substantially corresponding to an inner diameter of a cable conduit opening, and a cable insertion hole penetrating in a tube axial direction with a diameter substantially corresponding to an outer diameter of a cable in a central portion. A tubular plug having the above-mentioned plug is provided, and a thick portion of the plug has one cut for inserting the cable into the insertion hole from the outside and at least one key groove penetrating in the pipe axial direction. And a keyway of the plug is provided with a key for fixing the plug in the conduit by forcibly fitting the keyway into the keyway. 2. The key is provided with a pulling member for external operation,
2. The waterproof device according to claim 1, wherein the pulling member is pulled out to the outside through a key groove of the tubular plug. 3. A cylindrical plug is provided with a cable insertion hole at the center,
One keyway is provided in the upper area of 360 ° of the thick part,
The waterproof device according to claim 1, wherein the waterproof device is formed in an arc shape concentric with the insertion hole. 4. The waterproof device according to claim 3, wherein a spacer made of a hard material is embedded in a partial area within 360 ° of the thick portion. 5. A cable insertion hole is provided at an eccentric position of the cylindrical plug, and at least one key groove is formed in a region where the thickness of the eccentric thickness portion is large. Waterproof device. 6. The waterproof device according to claim 1, wherein the tubular plug is made of water-swellable rubber.