JPH03285512A - Temporary rejoint structure of cable - Google Patents

Abstract

PURPOSE:To reuse a joint protective member by securing C rings, provided at the opposite ends of a rubber coated waterproof cloth to be mounted/ dismounted by means of a fastener, to end boards at the opposite sides of a cable joint and protecting the outside thereof by means of a cover provided with a fastener. CONSTITUTION:A cable joint is held, at the opposite sides thereof, by means of semicircular notches 14 made in an end board 11 split into three sections 12, 13, 13. An elongated hole 15 and a recess 16 are made between the opposite sections 13, 13' of the end board 11 and then the split sections 12, 13 are tightened by means of bolts 17 and nuts 18. A part to be jointed is then surrounded by a rubber coated waterproof sheet body 62, provided with a fastener (not shown) which can be opened/closed in the longitudinal direction and further provided with C rings 63, 64 at the opposite ends, and the C rings 63, 64 are inserted into the elongated hole 15 of the end board 11. Furthermore, a protective cover provided with a longitudinal fastener (not shown) is applied thereon and the cover and the sheet 62 are brought into pressure contact, at the opposite ends thereof, by means of rubber C rings thus making the jointing part airtight.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a connection part for temporarily sealing a communication cable once a waterproof and airtightly treated temporary connection part is dismantled. There it is.

It is effective when used to streamline and simplify the disassembly and resealing work of the sealed joint, and to improve the durability of the sealed joint.

[Prior art and issues] Connection work for communication cables involves connecting hundreds of core wires, so it takes a long time to make one connection, so it is necessary to temporarily interrupt the work and leave it in a temporary connection state. This is often treated with a temporary waterproof and airtight treatment. In this case, it is necessary to break the temporary seal in order to resume connection work.

If the work cannot be completed after restarting, waterproofing and airtight treatment will be performed again. The fact that it takes a long time to dismantle and reseal the temporary connection significantly affects the efficiency of the cable connection work. If the material used for this temporary waterproofing and airtight treatment cannot be reused due to the disassembly of the temporary joint, the cost of materials for re-waterproofing and airtightening cannot be ignored. Efforts have been made to enable repeated use of materials as much as possible, and to simplify temporary waterproofing and airtight treatment and dismantling of temporary connections. As this type of device, the one described in Japanese Utility Model Publication No. 60-3632 is conventionally known. This known technique aims to improve the outermost protective cover and the resealing structure of the opening of the adhesive rubber sheet for sealing over the prior art.

An outline of this known technology (hereinafter referred to as "prior art") will be explained with reference to FIGS. 11 and 12.

In order to temporarily seal the connection part 1 for connecting the two communication cables C2 and C1 to the communication cable C1, the end plate 2 (only the left end plate is shown in the drawing) is coated with a highly viscous moisture-proofing mixture. ) are formed on site, and each cable C, C,...
Grasp C3 closely.

A highly airtight adhesive sheet 3 is wrapped between both end plates, and the cable connection part 1 is covered by both end plates and the adhesive sheet 3 to block the outside air, and a protective cover 4 is further wrapped around the outside of the cable connection part 1 to close both ends. Tighten with belt 5.5 and attach end plates 2, 2.
The intermediate portion is tightened and reinforced by a belt 5. This adhesive sheet 3 includes a base layer mainly composed of vulcanized rubber that is integrally attached to one side of the fiber cloth, and an adhesive layer mainly composed of unvulcanized rubber adhered onto the base layer. It is an adhesive sheet.

The protective cover 4 is a sheet-like cover (made of synthetic fiber or the like) having water resistance, weather resistance, and tensile strength.

When resuming cable connection work, remove belt 5,
After removing the protective cover 4, insert the adhesive sheet 3 along the two-dot broken line Q.
The cable is cut in the circumferential direction along the cable, and the cut opening is expanded to expose the cable connection part 1 to perform core wire connection. When stopping the work again and resealing, fold the cut edge of the adhesive sheet 3 outward and attach the additional adhesive sheet 6 for repair.
Both ends of the adhesive sheet 3 are rolled up and connected to the folded parts 3a and 3b, and the protective cover 4 is reattached.

The space C sealed by the end plates 2, 2 and the adhesive sheet 3 is filled with inert gas at a pressure of approximately 0.7 kg/■2 to prevent outside air from entering the space C, and to protect the connection from the outside air. Since it is intended for protection, the hermeticity of this sealing structure is required to be quite high.

The above-mentioned prior art is a considerable improvement over the prior art in terms of temporary waterproofing and airtight treatment, streamlining re-repair work after demolition, and efficiency and cost reduction. However, the following points remain to be improved.

In other words, because the end plates are formed on-site using a moisture-proofing compound, it takes time to attach the end plates to the cable, and when the cable is unsealed and the core wire connection work is resumed, the end plates are The airtightness of the board may be destroyed, and when performing waterproof and airtight treatment again, it is often necessary to remove the old end plate and replace it with a new one. Since the sheet is opened by cutting, repairing the opening is time-consuming. Furthermore, since the protective cover is secured to the end plate by tightening with a belt, it is time-consuming to attach and remove the protective cover.

The present invention improves the above-mentioned points regarding the prior art, and further streamlines and improves the efficiency of waterproofing and air-sealing processing work, and eliminates the need to use new materials for resealing, thereby reducing material costs. The objective is to reduce the

[Means to solve the problem] The measures taken to solve the above problem are the following elements (a) ~
It is composed of (e).

(a) The end plate is made of resin, and the cable is gripped by the circular notch in the end plate so that it can be attached and detached.

(b) The airtight sheet is made of rubberized waterproof cloth, both ends of which are wrapped around the outer periphery of the end plate, both ends of the airtight sheet are removably connected with vertical fasteners, and this connection is sealed with a sealing material. .

(c) Place the protective cover over the airtight sheet and connect both ends of the protective cover with vertical fasteners so that it can be attached and removed; (d) Fit both ends of the airtight sheet body tightly to the outer periphery of the rubber C-shaped ring. to form the airtight sheet, and the rubber C
The inner peripheral surface of the mold ring has a U-shaped cross section.

(e) A rubber C-shaped ring was fitted around the outer periphery of the end plate, and both end plates were connected to each other via an airtight sheet.

[Operation] The end plate is attached to the cable by gripping the cable with the circular notch in the end plate made of resin such as elastic plastic or rubber.

Fit the C-shaped rings at both ends of the airtight sheet to the outer periphery of both end plates,
Both ends of the airtight sheet are brought together and connected using a fastener. Hang a band from the outside of the C-shaped ring and tighten the band so that the inner periphery of the C-shaped ring is tightly attached to the outer periphery of the end plate. The abutting ends of the C-ring are sealed with a sealant. At this time, since the end surfaces of the C-shaped rings are in close contact with each other, the sealed gas inside the airtight sheet does not leak from the abutted end surfaces of the C-shaped rings.

Since the outer periphery of the end plate is tightened by the C-shaped ring, the cutout surface of the resin end plate strongly grips the outer surface of the cable directly or indirectly, improving the sealing performance of the outer surface of the cable. The joints at the side edges of the airtight sheet are sealed with a sealant.

Therefore, the sealing performance formed by the airtight sheet and the end plate is sufficiently ensured.

Cover the airtight sheet with a protective cover and connect its side edges with longitudinal fasteners. At this time, the protective cover is pulled in the circumferential direction and tension is applied.

Both ends of the protective cover grip the end plate by their own circumferential tension and are secured to the end plate.

The outer periphery of the end plate is fitted onto the inner periphery of the C-shaped cross section of the C-shaped ring at both ends of the airtight sheet, and the C-shaped ring is fixed to the outer periphery of the end plate by the tightening band, and both the left and right end plates are connected to the airtight sheet. , the end plate is reliably prevented from being displaced by being pushed by the gas pressure of the filled gas.

Since the airtight sheet is made of rubberized waterproof fabric, the strength of the airtight sheet itself is sufficient to counter internal pressure.

Therefore, there is no need to protect the airtight sheet with a protective cover against internal pressure, and since almost no force from internal pressure acts on the protective cover, there is no need to tighten the protective cover with a belt or the like to strengthen it. The cover is securely secured by tightening the zipper with force.

As described above, attaching the end plate to the cable, attaching the airtight sheet, and attaching the protective cover are extremely easy.

done quickly. When reconnecting the cable core wires, these can be easily removed from the cable by unzipping the protective cover's zipper and the airtight sheet's zipper. If you want to reattach it, follow the steps above. Just repeat.

Breaking the seal does not involve cutting the airtight sheet and will not destroy the airtightness of the end plate.

There is no need to repair these for resealing.

Therefore, both the initial installation and the resealing process can be carried out extremely easily and quickly. explain.

The end plate 11 has four cables passing through the end plate, and is a split disk consisting of three parts: a central part 12 and left and right side parts 13 and 13.

A semicircular notch 14.14 is provided on the mating surfaces of the central portion 12 and the two side portions 13.13.

A long groove 15 is provided on the outer periphery of the central portion 12, and recesses 16 are provided on both ends of the outer periphery of both side portions. The central part 12 and the side parts 13.13 are connected by bolts 17 and nuts 18. In this state, the bolt 17 and nut 18 are placed in the recess 16.
and is buried in the long groove 15 and does not protrude above the outer peripheral surface of the end plate 11. Notch 1 on the mating surfaces of the center portion 12 and both side portions 13
4 together form a circular hole in which the cable is gripped airtight.

If one cable passes through the end plate, the remaining three holes are closed by plugs 21.

The plug 21 has the shape shown in FIGS. 2 and 3, and is a cylindrical plug made of rubber.

The plug 21 is a hollow cylindrical body with a bottom, and an annular groove 22 is provided on its outer periphery. The width of this groove 22 is the end plate 11
The diameter d of the bottom of this groove is equal to the thickness t of the notch 14.1
The notch 14 has a slightly larger diameter than the inner diameter of the hole formed by the groove 22, and the peripheral edge of the notch 14 is hermetically fitted into this groove 22.

A gas valve 24 is provided in the center of the bottom 23 of the plug 21. When a plurality of plugs are attached to one end plate, it is sufficient that at least one of the plugs is provided with the gas valve 24, and it is not necessarily necessary to provide the gas valve 24 on all the plugs.

For example, if - cables are to be passed through, plugs 21 are attached to the remaining three holes to close the holes. It is sufficient that one of the three plugs has a gas valve. After the temporary reconnection section of the cable is sealed with an airtight sheet, the gas valve 24 is used to fill the sealed chamber with inert gas.

Next, an example of the airtight sheet will be described with reference to FIGS. 4 and 5.

The airtight sheet main body 62 of the airtight sheet 61 is a rubberized waterproof sheet with high elasticity and high tensile strength conventionally used in so-called rubber boats, etc., and its both ends are connected with C-shaped rings 63 and 64 whose inner periphery is U-shaped in cross section. It is wrapped around the outer periphery and adhered with an adhesive, and is pressed down with reinforcing tape T to make it airtight.

[See FIG. 4, (b) YY enlarged sectional view] One side end of the inner side of the outer periphery of the C-shaped ring 63, 64 is notched into an L-shape to form a notch recess 63'64'. (See Figure 6).

An airtight flexible sheet 65.6 is attached to the side edge of the airtight sheet main body 62.
One side edge of the flexible sheet 5 is airtightly adhered, and both ends of this flexible sheet are overlapped with the outer periphery of the C-shaped ring 63, 64.

A fastener 66, 67 is bonded to the outer surface of the other side edge, ie, the free edge, of the flexible sheet 65, 65.

The fasteners 66, 67 are made of plastic having the same length as the flexible sheet 65, and have a female member having a C-shaped groove 66' and a male member having a T-shaped protrusion 67'. Both fasteners are airtightly connected by fitting them into the C-shaped groove 66' of the female member. 111
The male and female fasteners are combined, the flexible sheet 65 is folded back into a U-shape, and both fasteners 66 and 67 are attached to the C-shaped ring 63.
．． The flexible sheet to be fitted into the notched recesses 63' and 64' of 64 is folded back into a U shape, and the inner surfaces of both ends are filled with sealing material such as grease, and both ends of the flexible sheet are attached with adhesive tape 68. Press the adhesive tape with the C-shaped ring 63.6
4, and both ends of the flexible sheet folded back into a U shape are fixed to the outer periphery of the C-shaped ring. Both ends of the flexible sheet are filled with grease and pressed by tape 68, so that both ends are sealed. The length of the adhesive tape 68 may be long enough to press the end of the flexible sheet.

A tightening band B (see Fig. 8 for details) is wound around the C-shaped ring, and the tightening metal fittings S at both ends are tightened to tighten the C-shaped ring. By applying a sealing material such as grease to the abutting end surfaces f of the C-shaped rings 63 and 64,
It is possible to prevent the sealed gas from leaking from the abutting end faces.

Next, regarding the protective cover 91, the protective cover has water resistance, weather resistance,
It is a sheet material having tensile strength, and fasteners 94 and 95 similar to the female and male fasteners 66 and 67 of the airtight sheet are attached to both side edges thereof.

Finally, an example of the structure of the temporary reconnection part of the present invention is shown in FIGS. 9 and 1.
This will be explained with reference to Figure 0.

Cables C4 and C are inserted into the circular notches 14 of the left and right end plates 11.
, , C, and connect the end plate 11 to the cables C1 and C2.
and C1 respectively.

For the right side end plate 11, insert the plug 21 into the remaining circular notch.
Insert and occlude.

After the outer periphery of the end plate 11 is fitted to the inner periphery of the C-shaped cross section of the C-shaped rings 63 and 64 at both ends of the airtight sheet 61.

Connect fasteners 66 and 67. The flexible sheet 65 is folded back into a U shape, both ends of which are filled with sealing material, and both ends are stacked on the outer periphery of the C-shaped rings 63 and 64.

Both ends of the fasteners 66, 67 are fitted into the cutout recesses 63', 64' of the C-ring. Then adhesive tape 6
8 to secure it to the outer periphery of the C-shaped rings 63 and 64. A sealing material such as grease is applied to the abutting end face f (see FIG. 6) of the C-shaped ring to seal this abutting face.

A fastening band B1 is wrapped around the outer periphery of the C-shaped ring, and the fastening metal fitting S is tightened to fix the C-shaped ring to the outer periphery of the end plate.

As a result, both end plates 11.11 are connected to each other via the airtight sheet 61. Next, the protective cover 91 is wrapped around the outside of the airtight sheet 61, and the vertical fasteners 94.9
Combine 5.

Both ends of the protective cover 91 are fastened to the outer periphery of the band B.

[effect] The present invention produces the following specific effects (advantages).

The airtight sheet is not an adhesive sheet, but a rubberized waterproof cloth used in rubber boats, etc. (Can be used as an airtight sheet by using a zipper)
Because of its high physical strength and durability, it is highly reliable and can be used repeatedly. The same applies to both end plates, and since they can be used repeatedly, running costs are significantly reduced.

Furthermore, by simply fitting the C-shaped ring around the outer periphery of the end plate, both the left and right end plates can be connected to each other via an airtight sheet, reliably preventing movement or displacement of the end plate due to internal pressure. The installation work can be done extremely simply and easily.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the end plate of the present invention, FIG. 2 is a perspective view of an embodiment of the plug, FIG. 3 is a front view of the plug shown in FIG. 2, and FIG. A perspective view of the airtight sheet, (b) is an enlarged cross-sectional view of Y-Y@ of the above (a), and Fig. 5 is Fig. 4 (a)
6 is a sectional view taken along line B-B in FIG. 5, FIG. 7 is a partially enlarged view of the closed airtight sheet, and FIG. 8 (A)
is a front view of the tightening band, (b) is an enlarged view of section A in the direction of arrow (a) above, FIG. 9 is a front view of an embodiment of the present invention, and FIG. 10 is a cross section taken along line XX in FIG. 9. 11 and 12 are partially cutaway front views of the prior art. In the figure, 1... cable connection part, 2, 11... end plate,
3... Adhesive sheet, 4.91... Protective cover, 5.
...Belt, 6...Additional adhesive sheet for repair, 12.
...Central portion of end plate 11. 13... Both sides of the end plate 11, 14... Semicircular notch, 15... Long groove, 16... Recess, 17... ・
Bolt, 18...Nut, 21...Plug, 22.
... Annular groove, 23 ... Bottom of plug, 24 ... Gas valve, 61 ... Airtight seat, 62 ... Seat body,
63.64...C-shaped ring, 63'64'...
・Notch recess, 65...Flexible sheet, 66.67...
- Fastener 66'...C-shaped groove, 67'...T-shaped protrusion, -68...adhesive tape, 94.95...fastener, B...tightening band. Figure 1

Claims (1)

[Claims] (1) Attach the cable using the circular notch in the resin end plate.
Grip the airtight sheet removably, wrap both ends of the airtight sheet made of rubberized waterproof cloth around the outer periphery of the end plate, connect both ends of the airtight sheet with vertical fasteners in a removable manner, and seal this connection with a sealing material. A protective cover is placed over the airtight sheet, and both ends of the protective cover are connected with vertical fasteners so that they can be attached and removed. The rubber C-shaped ring is fixed to form the above airtight sheet, the inner peripheral surface of the rubber C-shaped ring is made into a U-shape in cross section, and the rubber C-shaped ring is fitted around the outer periphery of the end plate to connect both end plates to each other via the airtight sheet. The structure of the temporary cable reconnection section.