JPH0626028Y2 - Waterproof sealing device - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention [Industrial field of application] The present invention is provided with a highly water-absorbing rubber member arranged between the opening of the underground burial pipe and the cable for underground burial. The present invention relates to a waterproof sealing device.

[Prior Art] Conventionally, as a waterproof sealing device of this type, like the waterproof sealing device 10 shown in FIGS. 3 (a) and 3 (b), a highly water-absorbing rubber member 11 to be inserted into an opening of an underground buried pipe 30 is used. It has been proposed that the main body cylinder portion 11A and the flange portion 11B have the same high swelling rate.

[Problems to be Solved] However, in the conventional waterproof seal device 10 , when (i) groundwater arrives as shown by an arrow in FIG. 3 (a), the groundwater passes through the through hole 11D along the underground burying cable 20. There is a defect that it intrudes into the underground buried pipe 30 from the above, and (ii) when the super absorbent rubber member 11 absorbs ground water and swells, FIG. 3 (b)
As shown in, the flange portion 11B is excessively swollen and deformed, and as a result, the highly water-absorbent rubber member 11 is separated from the peripheral surface of the underground burying cable 20 , and the underground water enters the underground burying pipe 30 . There was also the drawback of doing so. Furthermore, (iii) since the highly water-absorbent rubber member 11 is in direct contact with the cable, a frictional force with the cable is large at the contact portion, and (iv) extraction work is difficult when removing the cable. Further, (v) the cable expands and contracts due to thermal expansion or thermal contraction due to environmental changes, but at that time, there is a possibility that the cable may be caught at the contact portion with the highly water-absorbing rubber member, resulting in poor sealing.

Therefore, in order to eliminate these drawbacks, the present invention can prevent the groundwater from immediately absorbing and entering the underground burial pipe when it arrives, and even if the groundwater is absorbed, it should be separated from the peripheral surface of the underground burial cable. A waterproof seal device that can prevent the infiltration of groundwater into underground buried pipes, reduces the frictional force with the cable, facilitates cable removal work, and allows cable expansion and contraction during thermal expansion or contraction. It is intended to be provided.

(2) Configuration of the Invention [Means for Solving the Problems] The means for solving the problems provided by the present invention is provided in the conduit opening portion through which the cable is inserted, and the gap between the outer circumference of the cable and the inner circumference of the conduit opening portion is provided. In a waterproof sealing device including a highly water-absorbing rubber member for sealing a water-absorbing rubber member, the highly water-absorbing rubber member is inserted between an inner circumference of a pipe opening and an outer circumference of a cable, and a main body cylinder part having a large swelling rate, and the main body cylinder part. An externally exposed portion having a swelling rate smaller than that of the main body tubular portion that is integrally formed with respect to the main body tubular portion, and has a water absorbing fiber member on the inner circumference of the main body tubular portion. It is a waterproof seal device characterized by having a fastening member for the cable on the outer periphery of the exposed portion.

[Operation] The waterproof sealing device according to the present invention is made of a highly water-absorbent rubber material, and is disposed between the opening of the underground burying pipe and the underground burying cable passing through the opening. In a waterproof sealing device including a member, a main body tube portion of a highly water-absorbing rubber member inserted into an opening of an underground buried pipe has a greater swelling ratio than a flange portion, and a main body tube portion of the highly water-absorbing rubber member. Since the water-absorbent fiber member is arranged on the inner peripheral surface of the part, (i) when the groundwater arrives, the water-absorbent fiber member immediately absorbs it and expands in a short time. It has the effect of substantially preventing entry into the underground buried pipe, and (ii) the swelling rate of the flange portion outside the underground buried pipe is smaller than the swelling rate of the main body cylinder portion located inside the underground buried pipe. Therefore, it is highly preventive in absorbing groundwater. Without rubber member is excessively deformed,
As a result, it prevents the highly water-absorbing rubber member from being separated from the peripheral surface of the underground burying cable, and prevents groundwater from entering the underground burial pipe. Since it is good, it has a function of allowing relative movement with the underground burying cable when not absorbing groundwater, and consequently (iv) an action of ensuring removal of the underground burying cable, and (v) ) It has the function of permitting the expansion and contraction or movement of the underground burial cable upon thermal expansion or contraction.

[Embodiment] Next, the waterproof sealing device according to the present invention will be specifically described with reference to its preferred embodiments. However, the embodiments described below are provided for facilitating or facilitating the understanding of the present invention, and not for limiting the present invention. In other words, each member disclosed in the embodiments described below includes various design changes and equivalent replacements as long as they are within the spirit and technical scope of the present invention.

FIG. 1 (a) is a sectional view showing a first embodiment of a waterproof sealing device according to the present invention.

FIG. 1 (b) is an exploded perspective view of the embodiment shown in FIG. 1 (a).

FIGS. 1 (c) and (d) are sectional views for explaining the operation of the embodiment shown in FIG. 1 (a).

2 to 4 are cross-sectional views showing second to fourth embodiments of the waterproof sealing device according to the present invention.

First, referring to FIGS. 1 (a) to (d), the structure and operation of a first embodiment of a waterproof sealing device according to the present invention will be described in detail. Reference numeral 10 denotes a waterproof seal device according to the present invention, which is installed in the surroundings of an underground burying cable 20 and has an underground burying pipe 30.
By being installed in the opening of the underground cable
Groundwater flows from the gap between the underground pipe 20 and the underground pipe 30.
Prevents intrusion into 30 .

The waterproof seal device 10 has a large swelling rate and an underground buried pipe 30.
Main body tubular portion 11A to be inserted into the opening portion of, and a flange portion that is integrally formed with the main body tubular portion 11A, has a small swelling rate, and is not inserted into the opening portion of the underground buried pipe 30 and is located outside the opening portion. 11B and the outer end surface of the flange portion 11B having a small swelling rate (that is, the end surface not joined to the main body tubular portion 11A)
A through hole 11 for inserting the underground burying cable 20 into the main body tubular portion 11A, the flange portion 11B and the lip portion 11C.
A highly water-absorbing rubber member 11 is provided which closes the gap between the inner peripheral surface of the opening of the underground burying pipe 30 and the peripheral surface of the underground burying cable 20 by forming D and swelling when absorbing water. Above flange 11
B and the lip portion 11C constitute the external exposed portion of the present invention.

Further, the waterproof sealing device 10 is a main body cylindrical portion of the highly water-absorbing rubber member 11.
Water absorbing fiber members 12 and 13, which are respectively disposed on the inner peripheral surface 11Aa and the outer peripheral surface 11Ab of 11A, have good compressibility and are rich in water absorption capacity, and promote water absorption of the main body cylindrical portion 11A, and a lip portion. Even if the highly water-absorbent rubber member 11 swells when absorbing water, it is prevented from being separated from the peripheral surface of the underground burying cable 20 and is high due to the back pressure accompanying the waterproof swelling. Tightening member 14 for preventing the water absorbent rubber member 11 from being likely to be pushed out of the opening of the underground buried pipe 30.
It has and.

The waterproof seal member 10 has a highly water-absorbing rubber member 11 (that is, a main body tubular portion 11A, a flange portion 11B and a lip portion 11C) and a water-absorbing fiber member in order to allow the underground burying cable 20 to pass through and to be inserted into the through hole 11D. A slit portion 15 formed in series for 12 and 13 is provided. A double-sided tape (not shown) is arranged in the slit portion 15 if desired. This double-sided tape has a function of closing the slit portion 15 after passing the underground burying cable 20 ,
As a result, it has a function of preventing the infiltration of groundwater into the underground buried pipe 30 through the slit portion 15.

Here, the highly water-absorbent rubber member 11 is made of a synthetic rubber (for example, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, ethylene-propylene rubber, etc.) mixed with a highly water-absorbent polymer (for example, “Sumikagel” manufactured by Sumitomo Chemical Co., Ltd.). It may be made of water-absorbing rubber material, and
The mixing ratio of the highly water-absorbing polymer in 11A may be set higher than the mixing ratio of the highly water-absorbing polymer in the flange portion 11B and the lip portion 11C.

Therefore, in order to arrange the waterproof sealing device 10 between the opening of the underground burying pipe 30 and the cable 20 for underground burying, first, the cable for underground burying inserted through the opening of the underground burying pipe 30.
By inserting 20 into the slit part 15 and letting it pass,
The waterproof seal device 10 (the underground cable 20 into the through-hole 11D of the waterproof seal device 10 in other words) around the underground cables 20 allowed to arrangement. When a double-sided tape is provided for the slit portion 15, after that, the slit portion 15 is joined and closed by the double-sided tape.

Next, the waterproof sealing device 10 is moved along the underground burying cable 20 toward the opening of the underground burying pipe 30 , and the main body tubular portion 11
Push A into the opening of underground pipe 30 . At this time, the flange portion 11B is in contact with the opening edge portion of the underground burying pipe 30 , and the inner peripheral surface 11Aa of the main body tubular portion 11A has the underground burying cable 20.
Encloses the peripheral surface of the main body at a slight distance, and
The outer peripheral surface 11Ab of is substantially in contact with the inner peripheral surface of the opening of the underground buried pipe 30 . Furthermore, the inner peripheral surface of the water absorbing fiber member 12 disposed on the inner peripheral surface 11Aa of the main body tubular portion 11A is in contact with the outer peripheral surface of the underground burying cable 20 , and is disposed on the outer peripheral surface 11Ab of the main body tubular portion 11A. The outer peripheral surface of the absorbed water absorbent fiber member 13 is in contact with the inner peripheral surface of the opening of the underground buried pipe 30 .

Finally, after the tightening member 14 is wound around the peripheral surface of the lip portion 11C, by rotating the tightening screw 14a,
The lip portion 11C is appropriately tightened and arranged.

As described above, the waterproof sealing device 10 according to the present invention installed on the opening portion of the underground buried pipe 30 has
It arrives at the opening of 30 as indicated by the arrow, and along the inner peripheral surface of the opening of the underground burying cable 20 and the underground burying pipe 30 , as shown in FIG. Inner surface 11Aa
And when it penetrates into the outer peripheral surface 11Ab, the water absorbing fiber members 12, 13
Immediately absorbs the groundwater and expands as shown in FIG. 1 (c), and sufficiently blocks the infiltration of groundwater into the underground buried pipe 30 at the initial stage.

After that, in the waterproof seal device 10 , the main body cylinder portion 11A, the flange portion 11B and the lip portion 11C of the highly water-absorbing rubber member 11 absorb water,
Since it swells gradually, as shown in Fig. 1 (d), the gap between the inner surface of the opening of the underground buried pipe 30 is closed, and as a result, the infiltration of groundwater into the underground buried pipe 30 is continuously maintained. Block to.
At this time, since the flange portion 11B is set to have a smaller swelling rate than the main body tubular portion 11A, the inner peripheral surface of the flange portion 11B is separated from the peripheral surface of the underground burying cable 20 even when deformed during water absorption. It is possible to sufficiently prevent the infiltration of groundwater into the underground buried pipe 30 .

Further, since the tightening member 14 is arranged on the outer peripheral surface of the lip portion 11C, the inner peripheral surfaces of the flange portion 11B and the lip portion 11C are the peripheral surface of the underground burying cable 20 even if it swells due to water absorption. It is possible to prevent the inner peripheral surfaces of the flange portion 11B and the lip portion 11C from being separated from the peripheral surface of the underground burying cable 20 even if the peripheral surface of the underground burying cable 20 has some distortion. Similarly, it is possible to prevent the intrusion of groundwater into the underground buried pipe 30 more sufficiently.

Further, the waterproof sealing device 10 according to the present invention is such that the underground burying cable 20 and the main body tube portion are in a state where the underground water is not absorbed.
A small space, that is, a gap is secured between the inner peripheral surfaces of 11A, the flange portion 11B and the lip portion 11C, and the inner peripheral surface of the water absorbing fiber member 12 only contacts the peripheral surface of the underground burying cable 20. since it is, like the thermal expansion or thermal contraction of underground cables 20 can tolerate movement in the extending direction of the companion lie, can tolerate dismantling of underground cables 20 together.

With reference to FIG. 2, the structure and operation of the second embodiment of the waterproof sealing device according to the present invention will be briefly described.

The second embodiment has substantially the same configuration as the above-described first embodiment except that the absorbent fiber member 13 is removed. Therefore, here, for convenience of description, the same members are denoted by the same reference numerals, and detailed description thereof will be omitted.

Therefore, the second embodiment is slightly inferior to the first embodiment in the ability to block the groundwater intruding along the inner peripheral surface of the opening of the underground burying pipe 30 at the initial stage.

(3) Effect of the Invention As is clear from the above, the waterproof sealing device according to the present invention has the water absorbing fiber member provided on the inner circumference of the main body cylindrical portion of the highly water absorbing rubber member. Can be immediately absorbed and expanded in a short time, and groundwater can be prevented from entering the pipeline in the initial stage.

In addition, the swelling rate of the externally exposed part of the highly water-absorbing rubber member protruding outside the pipeline opening is small, and the outer periphery of the externally exposed part is tightened with a tightening member, so when absorbing groundwater, it will be A defective seal can be prevented by excessively deforming the exposed portion.

Further, since the water absorbing fiber member is provided on the inner circumference of the main body tubular portion, the water absorbing fiber member comes into contact with the outer peripheral surface of the cable. This water-absorbent fiber member has better compressibility and is more slippery than the rubber material that forms the main body cylinder, so the cable can be easily removed and removed, and the cable can be expanded or contracted even when it is thermally expanded or contracted. can do.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing a first embodiment of a waterproof sealing device according to the present invention, and FIG. 1 (b) is an exploded perspective view of the embodiment shown in FIG. 1 (a). FIGS. 3 (c) and 3 (d) are sectional views for explaining the operation of the embodiment shown in FIG. 1 (a), and FIG. 2 is a sectional view showing the second embodiment of the waterproof sealing device according to the present invention. 3 (a) and 3 (b) are sectional views showing a conventional example. 10 …… Waterproof sealing device 11 …… Highly water-absorbing rubber member 11A …… Main body cylinder 11B …… Flange part (externally exposed part) 11Aa …… Inner peripheral surface 11Ab …… Outer peripheral surface 11C …… Lip part (externally exposed part) 11D ... Through hole 12, 13 ... Water absorbing fiber member 14 ... Tightening member 14a ... Tightening screw 15 ... Slit portion 20 ... Underground cable 30 ... Underground pipe

Claims (1)

[Scope of utility model registration request] 1. A waterproof sealing device provided with a highly water-absorbing rubber member, which is provided at an opening of a conduit through which a cable is inserted and seals a gap between an outer circumference of the cable and an inner circumference of the opening of the conduit, wherein the highly water-absorbing rubber member is provided. A main body cylindrical portion having a large swelling ratio, which is inserted between the inner circumference of the pipeline opening portion and the outer circumference of the cable, and the main body tubular portion integrally formed with the main body tubular portion and protruding outside the pipeline opening portion. Also, an outer exposed portion having a small swelling rate is provided, and a water-absorbing fiber member is provided on the inner circumference of the main body cylinder portion, and a fastening member for the cable is provided on the outer exposed portion outer circumference.