JPH0545070Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a sealing device for underground cables, and in particular, it uses a resin case and a super absorbent rubber packing to seal the gap between the underground pipe and the cable. This invention relates to a sealing device for underground cables.

[Prior art and its problems]

Conventionally, when cables are buried underground using buried pipes, in order to prevent rainwater and muddy water from entering from manholes through the gap between the buried pipes and the cables, the cables are installed as shown in Figures 5 and 6. Sealing devices for underground cables are used.

That is, the one shown in FIG. 5 has annular spacers 43, 4 in the gap between the buried pipe 41 and the cable 42.
4 is inserted, and the two liquids are mixed between the spacers 43 and 44 and the end of the buried pipe 41 to prepare a foam rubber packing 45 and filled.

In addition, the one shown in FIG. 6 has an annular rubber gasket 50 between a pair of metal discs 48 and 49 with a cable insertion hole in the center.
This is inserted into the gap between the buried pipe 46 and the cable 47, and the bolt 51 is inserted between the metal plate 48 and the metal plate 49.
By tightening, the annular rubber gasket 50 provided between them is deformed inward and outward in the radial direction, thereby sealing the gap between the buried pipe 46 and the cable 47.

In the case of the one shown in FIG. 5, the foamed rubber packing 45 was prepared by mixing two liquids on-site, which made the work complicated and time-consuming. Further, as the cable 42 contracts, a gap is created between the cable 42 and the foam rubber packing 45, and rainwater, muddy water, etc. enter through the gap, causing corrosion of the cable 42. Further, since the foam rubber packing 45 is firmly attached to the surface of the cable 42, there is a problem that it becomes difficult to pull out the cable 42 when removing the cable 42.

In the case of the one shown in FIG. 6, because the annular rubber gasket 50 does not deform uniformly when installed in the gap, the gap between the buried pipe 46 and the cable 47 cannot be completely sealed, and rainwater and There were problems such as the inability to completely prevent muddy water from entering.

[Means for solving problems]

In order to solve the above problems, the present invention provides a sealing device for underground cables that is installed at the open end of a cylindrical buried pipe into which a cable is inserted, and seals between the cable and the buried pipe. The sealing device includes a resin case and a highly water-absorbent rubber gasket disposed between the resin case and the cable, and the resin case has a hole in the center for passing the cable through. And while forming a cylindrical shape,
A part of the outer circumferential surface is a flange portion with a larger diameter than the inner diameter of the buried pipe, and the other outer circumferential surface has an annular bead portion, and a flange portion with a larger diameter than the portions on both sides is provided at the center of the inside of the hole for passing the cable. The super absorbent rubber packing has an annular recess, both end surfaces of the annular recess are tapered surfaces, and the recess has a water supply hole communicating with the outside. , has an annular shape and has a cable insertion hole inside, and a part of the cable insertion hole has a lip portion that has a diameter larger than the diameter of the cable when dry and comes into contact with the cable surface when water is absorbed. and has lip portions at both ends that abut against the tapered surfaces of the recessed portions of the resin case.

Further, there is provided a sealing device for an underground cable, which is provided at an open end of a cylindrical buried pipe through which a cable is inserted, and seals between the cable and the buried pipe, the sealing device having a resin case. , consisting of a rubber packing disposed between the resin case and the cable, and a tightening member disposed between the rubber packing and the resin case, and the resin case has the cable in the center. It has a cylindrical shape with a hole for insertion, and a part of the outer circumferential surface is a flange portion having a larger diameter than the inner diameter of the buried pipe, and the other outer circumferential surface has an annular beat portion, and the cable The insertion hole has an annular recess in the center thereof with a larger diameter than both sides, and both end surfaces of the annular recess are tapered surfaces. It has a hole for cable insertion, and is provided in a part of the hole for cable insertion, and provided in a lip portion and both ends that contact the outer periphery of the cable by the tightening member, and a tapered portion of the concave portion of the resin case. It may have a lip portion that comes into contact with the surface.

〔Example〕

This embodiment shown in the drawings will be described below.

1 and 2 show an embodiment of an underground cable sealing device according to this invention.

In other words, this underground cable sealing device prevents rainwater or muddy water from the manhole from entering the underground pipe 1 through the gap between the underground pipe 1 and the cable 2 when the cable 2 is buried underground using the underground pipe 1. The purpose is to prevent contact between the cable 2 and the buried pipe 1 under the weight of the cable 2, and to prevent contact between the cable 2 and the buried pipe 1. It is formed from a rubber gasket 3.

The resin case 4 is provided with a hole 20 in the center through which the cable 2 is inserted, and a flange portion 13 provided on a part of the outer peripheral surface has an outer diameter larger than the inner diameter of the buried pipe to be used. It's summery.

In addition, annular bead parts 15 and 16 are provided on the other outer circumferential surface to enhance adhesion with the inner circumferential surface of the buried pipe, and the inner center of the hole 20 through which the cable is inserted is larger than both sides. A recess 17 having an annular diameter is provided. Both end surfaces of the recessed portion 17 are tapered surfaces 18 and 19.

Further, this annular recess 17 is adapted to accommodate an annular highly absorbent rubber packing 3.

Furthermore, this recessed portion is provided with at least one hole 11 for water supply that communicates with the outside.

On the other hand, the annular super absorbent rubber packing 3
has a hole for passing the cable through inside, and a part of the hole is provided with lip portions 5 and 6 which have a diameter larger than the diameter of the cable when dry and which come into contact with the cable surface when water is absorbed. Furthermore, tapered surfaces 18 and 19 of the recess 17 of the resin case 4 are provided at both ends.
There are provided lip portions 7, 8, 9, and 10 that abut against. A recess 21 for receiving water is provided on the outer peripheral surface.

Note that due to construction problems, the resin case 4 is divided into two parts, and the water-absorbing rubber gasket 3 is divided into one part.

By combining the resin case 4 and the super absorbent rubber packing 3 as shown above, an underground cable sealing device is formed.

Next, the effects of the above will be explained.

First, the underground cable sealing device consisting of the resin case 4 and the super absorbent rubber packing 3 shown above is installed so that the water supply hole 11 does not enter into the buried pipe 1 in the gap between the buried pipe 1 and the cable 2. Push it into position.

Then, from this water supply hole 11, the resin case 4
Water is supplied to the water receiving annular recess 21 of the super absorbent rubber gasket 3 inside, the annular recess 21 is filled with water, and the water supply hole 11 is sealed by plugging the plug 12.

While maintaining this state, the underground cable sealing device is pushed in until the flange portion 13 comes into contact with the end surface of the buried pipe 2.

In this way, the underground cable sealing device is installed in the gap between the underground pipe 1 and the cable 2.

In this case, the highly water-absorbent rubber gasket 3 inside the resin case 4 shown above gradually absorbs the water filled in the annular recess 21, and as a result, the volume gradually increases due to so-called swelling. It begins to transform.

Then, the tapered surface 1 of the recess 17 of the resin case 4
8 and 19, and as it absorbs water, its adhesion to the cable 2 gradually becomes stronger.

Such swelling and deformation of the highly absorbent rubber packing 3 seals the gap between the buried pipe 1 and the cable 2, thereby preventing rainwater, muddy water, etc. from entering from the manhole.

In addition, if rainwater or muddy water that enters the manhole falls on the highly absorbent rubber gasket 3 after the underground cable sealing device has been installed in the gap between the underground pipe and the cable, the rainwater or muddy water Since the highly water-absorbent rubber packing 3 absorbs even muddy water, the sealing performance of the gap between the buried pipe 1 and the cable 2 is further improved.

On the other hand, the annular bead parts 15 and 16 provided on the outer circumferential surface of the resin case 4 can enhance the close contact between the inner surface of the buried pipe 1 and the outer circumferential surface of the resin case 4, thereby further improving the sealing performance.

Then, the cable 2 is connected by this resin case 4.
can support the dead weight of the cable 2 and the buried pipe 1, thereby preventing contact between the cable 2 and the buried pipe 1.

3 and 4 show a second embodiment of the underground cable sealing device according to this invention.

That is, this embodiment is an underground cable sealing device consisting of a rubber packing 22, a tightening member 38, and a resin case 30, and when this is installed in the gap between the buried pipe 3a and the cable 40, Since the lip portions 23 and 24 provided in a part of the cable insertion hole of the rubber packing 22 strongly abut against the outer periphery of the cable 40 by the tightening member 38, rainwater or muddy water from the manhole is removed. This will prevent such intrusions.

Furthermore, if the rubber packing 22 is a highly water-absorbing rubber packing as shown in the first embodiment, the highly water-absorbing rubber packing absorbs rainwater or muddy water that enters the manhole and swells and deforms. In addition to the tight contact provided by the tightening member 38 to the outer circumferential surface of the cable, this also results in even stronger contact with the cable outer circumferential surface, so that the buried pipe 3
The sealing of the gap between the cable 9 and the cable 40 is further improved, and the intrusion of rainwater and muddy water can be completely prevented.

Also, as in the first embodiment, the resin case 30
The annular bead parts 33 and 34 provided on the outer circumferential surface of the cable enhance the close contact between the inner surface of the buried pipe 39 and the outer circumferential surface of the resin case 30, and furthermore, the resin case 30 supports the weight of the cable 40. Therefore, contact between the cable 40 and the buried pipe 39 is prevented.

The underground cable sealing device shown in the first and second embodiments can be easily removed by pulling the flange portions 13 and 31, so that the cable can be easily removed when the cable is removed.

[Effect of idea]

The present invention is configured as described above, and is designed to prevent rainwater and muddy water from entering the buried pipe through the gap between the buried pipe and the cable. By attaching it to the gap and swelling and deforming the super absorbent rubber gasket, it is possible to increase the adhesion to the outer circumferential surface of the cable.Furthermore, the annular beat part provided on the outer circumferential surface of the resin case allows the inner surface of the buried pipe and the resin case to be tightly bonded. Since the close contact with the outer circumferential surface can be improved, the gap between the buried pipe and the cable can be completely sealed by the underground cable sealing device consisting of a highly water-absorbent rubber packing and a resin case. Therefore,
It is possible to completely prevent rainwater, muddy water, etc. from entering the underground pipe from the manhole.

Additionally, if a sealing device for underground cables consisting of a rubber gasket, a tightening member, and a resin case is installed in the gap, the rubber gasket will tightly adhere to the outer circumferential surface of the cable due to the tightening member.
Furthermore, the annular bead part provided on the outer circumferential surface of the resin case can increase the adhesion between the inner surface of the buried pipe and the outer circumferential surface of the resin case, and the gap between the buried pipe and the cable can be filled with a rubber gasket and the clamping member and the resin case. Complete sealing can also be achieved using a sealing device for underground cables.

Therefore, this sealing device can completely prevent rainwater, muddy water, etc. from entering the buried pipe from the manhole.

Furthermore, the resin case of these underground cable sealing devices can support the cable's own weight, and as a result, it has excellent effects such as preventing contact between the cable and the buried pipe.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the underground cable sealing device according to this invention before installation, Fig. 2 is a sectional view showing the same as shown in Fig. 1 after installation, and Fig. 3 is an underground cable according to another embodiment. FIG. 4 is a sectional view of the sealing device shown in FIG. 3 after installation, and FIGS. 5 and 6 are sectional views showing a conventional underground cable sealing device. . 1, 39, 41, 46... Buried pipe, 2, 40,
42, 47...Cable, 3...Super absorbent rubber gasket, 4,30...Resin case, 5,6,
7, 8, 9, 10, 23, 24, 25, 26, 2
7, 28... Lip portion, 11... Water supply hole, 1
2... Plug, 13, 31... Flange part, 14, 3
2... Cylindrical part, 15, 16, 33, 34... Beat part, 17, 21, 29, 35... Recessed part, 18,
19, 36, 37... Taper part, 20... Hole, 2
2...Rubber gasket, 38...Tightening member,
43, 44... Spacer, 45... Foam rubber gasket, 48, 49... Metal disc, 50... Rubber gasket, 51... Bolt.

Claims (1)

[Claims for Utility Model Registration] (1) An underground cable that is installed at the open end of a cylindrical underground pipe 1 into which a cable 2 is inserted to seal the space between the cable 2 and the underground pipe 1. A sealing device, the sealing device includes a resin case 4.
and a super absorbent rubber gasket 3 disposed between the resin case 4 and the cable 2, the resin case 4 having a cylindrical shape and having a hole in the center for passing the cable through. In addition, a part of the outer circumferential surface is a flange portion 13 having a larger diameter than the inner diameter of the buried pipe 1, and the other outer circumferential surface has annular beat portions 15 and 16, and the inner center of the hole for passing the cable is formed. It has an annular recess 17 with a larger diameter than the parts on both sides, and both end surfaces of the annular recess 17 are tapered surfaces 18 and 19. Furthermore, the recess 17 has a water supply hole 11 communicating with the outside.
The super absorbent rubber packing 3
is annular and has a cable insertion hole inside, and a part of the cable insertion hole has a diameter larger than the diameter of the cable when dry,
Lip parts 5 and 6 that come into contact with the cable surface when water is absorbed
lip portions 7, which abut on the tapered surfaces 18, 19 of the recess 17 of the resin case at both ends;
8, 9, and 10. A sealing device for an underground cable. (2) An underground cable sealing device that is installed at the open end of the cylindrical buried pipe 39 into which the cable 40 is inserted, and seals between the cable 40 and the buried pipe 39, which The sealing device includes a resin case 30, a rubber gasket 22 disposed between the resin case 30 and the cable 40, and a tightening member disposed between the rubber gasket 22 and the resin case 30. 38, the resin case 30 has a hole in the center for cable insertion, and has a cylindrical shape,
A part of the outer circumferential surface is a flange portion 31 having a larger diameter than the inner diameter of the buried pipe 39, and the other outer circumferential surface has annular beat portions 33, 34. The rubber gasket 22 has an annular recess 35 having a diameter larger than that of the annular recess 35, and both end surfaces of the annular recess 35 are tapered surfaces 36 and 37.
It has a cable insertion hole inside, is provided in a part of the cable insertion hole, and is provided on the lip portions 23, 24 and both ends that contact the outer periphery of the cable 40 by the tightening member 38, Tapered surface 3 of recess 35 of the resin case
6. A sealing device for an underground cable, characterized in that it has lip portions 27 and 28 that abut against the cables 6 and 37.