JP2513330Y2 - Stopcock for cable conduit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a water stop body which is installed at an outlet portion where a conduit for laying a communication or power cable opens in a manhole.

(Prior Art) Generally, a pipe line laid with a communication or power cable is generally simply opened in a manhole. For maintenance and inspection, the rainwater accumulated in the manhole is pumped up and discharged. For this reason, rainwater collected in the manhole flows to the other through the above-mentioned pipeline, and concentrates in a manhole with a low altitude, for example,
There is a risk of obstructing traffic, such as pushing up the manhole cover and flooding the road.

Therefore, a water blocking body is attached to the outlet of the pipe to the manhole to prevent water from leaking into the pipe or from the pipe to the manhole. This water stopper is provided with, for example, a reactive urethane resin at a water blocking point, but the material strength is insufficient, and there is the inconvenience that if the water stopper is simply pushed into the pipeline opening, it will lose the water pressure and come off. is there. Therefore, a water stopcock is mechanically structurally attached to the opening of the conduit using a tool or the like, but the structure is complicated and expensive, and the attachment and detachment work is troublesome.

Also, the position of the cable inside the conduit and the position of the cable exiting from the conduit to the manhole are not constant, so if the holes for inserting the cable were formed concentrically in the water stopper, The cable must be displaced to a concentric position with respect to the conduit when fitted into the conduit opening. However, this is a very labor-intensive task, and is difficult in most cases manually.

(Problems to be Solved by the Invention) As described above, the water stopper for the opening of the cable conduit in the manhole is not satisfactory in terms of its structure, function, and handling. In other words, the stopcock must be one that can be easily attached to the opening of the pipeline, and must not come off due to the water pressure in the pipeline, etc. Therefore, it is necessary to be able to attach the water stopcock to the conduit opening while the cable led out into the manhole is being moved through the cable insertion hole of the waterstop without moving.

(Purpose of the Invention) The present invention has been made based on the above-mentioned circumstances, and can be loosely fitted when the plug portion is fitted to the opening of the cable conduit, but only expands later to withstand water pressure. So that a sufficient fitting pressure can be maintained, the material of the plug body is devised, and the cable insertion hole penetrating the plug body is formed in an eccentric state in advance and placed, The present invention seeks to provide a faucet for cable conduits that provides compatibility with both conduits.

(Means for Solving the Problem) Therefore, in the present invention, as is clear from the illustrated embodiment, the conduit (2) for laying the communication or power cable (1) has an opening (2a) in the manhole. ), Which is located at the outlet portion of the cable, and in which the cylindrical plug body (4b) is fitted into the conduit (2) while passing the cable (1), At least a part of the body part (4b) is provided with a water blocking body (7) made of water-expandable rubber or water-expandable thermoplastic elastomer formed by kneading a water-absorbent resin, and is formed on the plug part (4b). The cable insertion hole (5) is formed eccentrically in one side and has a shape in which a notch (6) extending in the radial direction from the insertion hole (5) is formed on the other side which is a thick side, and the plug body portion is formed. (Four
b) is fitted into the opening (2a) of the conduit (2) with one side, which is the thin side, facing downward.

(Operation) Therefore, even if the plug portion is loosely fitted when fitted into the opening of the pipeline, the water in the pipeline is absorbed by the water blocking body and expands with the passage of time, so that it adheres to the inner wall of the pipeline. , As it ensures a sufficient fitting pressure, it will not come loose. Also,
Since the cable is located in one direction in the pipeline (for example, in the direction of gravity), if the cable insertion hole is biased in that direction and the cable is fitted into the cable insertion hole through the notch, The plug part can be smoothly fitted into the opening of the conduit without moving the cable.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Normally, there are a plurality of conduits 2 through which the cable 1 is inserted,
They are arranged in parallel and are opened at the side walls of the manhole 3, respectively. As shown in FIG. 2, the water stop plug 4 fitted into the opening 2a of the pipe 2 is formed by forming a cylindrical plug body portion 4b on a circular flange 4a that abuts the side wall 3a of the manhole 3. The cable insertion hole 5 penetrating the plug portion 4b is eccentrically formed on one side, and a notch 6 is provided on the other side in the radial direction.

Then, in the middle of the plug portion 4b, as shown in FIG. 3, a disc-shaped water stopping body 7 is interposed and attached. The water stop plug 4 is made of usual rubber or thermoplastic elastomer except for the water stop body 7.
The waterproof body 7 is made of water-expandable rubber or water-expandable thermoplastic elastomer in which a water-absorbent resin (water-expandable resin) is kneaded.

Therefore, in the state in which the notch 6 is opened with respect to the cable 1 which is eccentrically arranged in the pipe line 2 and the cable 1 is fitted in the cable insertion hole 5, the plug body portion 4b as it is.
Is inserted into the opening 2a, even if it is in a loose state at the time of insertion, the water stop body 7 is caused by the water that has entered the conduit 2 later.
Expands in the radial direction and comes into close contact with the inner wall of the pipe line to obtain the required fitting pressure.

In the above-mentioned embodiment, the water shut-off body 4 is provided in the water shut-off tap 4 in the middle of the plug body portion 4b. However, as shown in FIG. It is also possible to have a water-swellable structure by itself. Further, as shown in FIG. 6, it goes without saying that the water blocking body 7 may have a donut shape reaching the cable insertion hole 5 and may have a two-layer structure with non-expanding rubber. In this case, the close contact between the cable 1 and the inner wall of the cable insertion hole 5 is ensured, and the function as the water stopcock can be sufficiently exerted.

Further, in the case of the composite structure shown in FIGS. 2 to 4 and 6, it is desirable to co-vulcanize the water expansion part and the non-expansion part.

(Effects of the Invention) The water stopcock for a cable conduit according to the present invention is as described above in detail, and the water stop body 7 is made of water-expandable rubber or water-expandable thermoplastic elastomer that is formed by kneading a water-absorbent resin.
By including, it is possible to easily fit when fitting the cable conduit opening 2a, and it is possible to secure a close contact force with sufficient water absorption expansion later, so that the handling is easy and the structure is simple.

Further, the cable insertion hole 5 formed in the cylindrical plug body portion 4b of the water stopcock is formed eccentrically to one side, and the notch 6 extending in the radial direction from the insertion hole 5 is formed on the other side which is the meat pressure side. Therefore, as compared with the case where the insertion holes are formed concentrically, the contact area of the cut portion is increased and the water leakage from the cut portion is reduced. Further, when the notch 6 is opened and the cable 1 is inserted into the insertion hole 5, the thin side of the plug body portion 4b may be deformed in the opening direction, which facilitates the insertion work.

Further, since the plug portion 4b is fitted into the opening 2a of the conduit 2 with one side, which is the thin side thereof, facing downward, the conduit opening 2a
Manhole 3 to cable 1 laid along the bottom of the section
When the plug body portion 4b is externally inserted from the side of the cable and pushed into the conduit opening 2a to be fitted, it is not necessary to lift the cable 1 largely from the bottom surface of the conduit opening 2a. Combine work is easy. Also, the cable 1 is the conduit 2
A practically excellent effect is obtained in that the step difference when riding on the plug portion 4b from the bottom surface of the cable 1 is small and the bending deformation of the cable 1 can be minimized.

As described above, according to the present invention, a number of practically excellent effects that have not been obtained in the past can be obtained in terms of structure, function, and handling.

[Brief description of drawings]

FIG. 1 is a perspective view of a manhole portion showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of a water stopcock of the present invention, FIG. 3 is a vertical side view, and FIG. 4 is a front view. , FIG. 5 and FIG. 6 are partially cutaway perspective views of another embodiment. 1 ... Cable, 2 ... Pipeline, 2a ... Pipeline opening, 3 ...
Manhole, 3a ... Side wall, 4 ... Water stopcock, 4a ... Flange, 4b ... Stopper part, 5 ... Cable insertion hole, 6 ... Notch, 7 ... Waterstop body.

Front page continuation (72) Inventor Hiroshi Shinjo 1-18-1 Kyobashi, Chuo-ku, Tokyo Shiai Kasei Co., Ltd. (72) Inventor Yujiro Sugimoto 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stocks In-company (72) Inventor Fumiya Sugihara 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor, No. 14 1-6, Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stocks Company (72) Inventor Tomio Yamane 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Toshiro Ikemoto 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Masao Ishii 1-15-7 Saga, Koto-ku, Tokyo Iwano Bussan Co., Ltd. (56) References JP-A-2-246721 (JP, A) SAIKAI Hira 2-41624 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A cable pipe in which a pipe line for laying a communication or power cable is located at an outlet portion opening in a manhole, and a cylindrical plug portion is fitted into the pipe line while the cable is passed through. In a water stopper for a road, at least a part of the plug portion is provided with a water stopper made of a water-expandable rubber or a water-expandable thermoplastic elastomer formed by kneading a water-absorbent resin, and is formed on the plug portion. The cable insertion hole to be formed is eccentrically formed on one side and has a shape in which a notch extending in the radial direction from the insertion hole is formed on the other side that is the thick side, and the plug body portion has one side that is the thin side. A water stopcock for a cable conduit, which is fitted in an opening of the conduit in a downward direction.