JPH04178105A - Water-stop structure for wiring conduit in building - Google Patents

Abstract

PURPOSE:To facilitate extension and replacement of cable by inserting a plurality of pipes accomodating cables into a conduit in a building and then filling the gaps between the cable and the pipe and between the pipe and the conduit with water stop material. CONSTITUTION:A plurality of cables 1 are inserted into a plurality of hard vinyl or steel pipes 6 and dams 8 are formed of soft sponge on the opposite ends. A space defined by the cable 1, the pipe 6 and the dam 8 is then filled with a water stop material 7 composed of two-component type foamable polyurethane polymer. Dams 4 are also provided between the inner peripheral surface of the conduit 3 in a building and the outer peripheral surface of the pipe 6 and same water stop material 5 is filled similarly in the space. When the cable is extended, a hole A is made through the water stop material 5 as shown on the drawing, the cable and the pipe are inserted therein and the water stop material is injected. According to the constitution, the cable can be extended or replaced easily without damaging existing cables.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a water-stopping structure for pipes for overhead lines in buildings that shuts off water at duct openings in manholes of buildings in which wires such as communication cables are installed. be.

[Conventional technology]

There are a large number of telephone lines connected to buildings where there are many telephone subscribers, and one old telephone line is usually installed at the mouth of a duct inside a building's manhole.
are collected in one place. In order to prevent water from entering into the pipes, measures as shown in FIG. 7 are taken. That is, for the purpose of blocking the vicinity of the conduit port 2 of the conduit 3, a dam 4 is formed using a sponge or the like inside the conduit 3 near the conduit port 2 and at the conduit port 2. Then, as shown in FIG. 8, the sealed space between the two dams 4 is filled with a water stop material forming material such as a two-component foamed urethane polymer and hardened to form a water stop material 5, and the pipe opening 2 is closed. Occlusion is being done. By the way, when the water in the conduit 3 has been shut off in this way, when the number of new telephone subscribers etc. increases and it becomes necessary to increase the number of cables 1, the water stop material 5 in the conduit 3 is A suitable hole is made with a punch or the like, a saw is passed through the hole to make the hole larger in diameter, and a cable is passed through the hole. Furthermore, the cable 1 is replaced by drilling a ring-shaped hole around the cable l in the same manner as described above, pulling out the cable l, and inserting a new cable.

[Problem to be solved by the invention]

However, the above method does not damage the cable 1 that has already been inserted during the drilling and sawing work, and since the above work is performed in a narrow space, it is difficult to perform the drilling and sawing work. The problem is that it takes a considerable amount of time.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a pipe water stop structure for building overhead wires, which allows holes to be easily made in the water stop material without damaging the wires.

[Means for Solving the Problems] In order to achieve the above object, the pipe water stop structure for building overhead wires of the present invention includes a water-stopping structure for building overhead wires, which has a
A hard cylindrical body is fitted onto the outside of each of the wire rods, the space between the outer circumferential surface of the wire rod and the inner circumferential surface of the hard cylindrical body is filled with a water-stopping material, and the space between the inner circumferential surface of the pipe and the outer circumferential surface of the hard cylindrical body is filled with a waterproof material. The structure is such that the space is filled with waterproof material.

[Function] That is, in the water-stopping structure for a building overhead line pipeline of the present invention, a wire such as a cable is inserted into a hard cylindrical body, and in this state, the inside of the pipeline is filled and blocked with a water-stopping material. . Therefore, when adding new wire rods, etc., when making new holes or the like in the water stop material, the wire rods are protected by the cylindrical body, so the wire rods are not damaged. Moreover, when replacing the wire, the wire can be extracted and replaced together with the hard cylindrical body, so the wire can be replaced easily and in a short time.

Next, the present invention will be explained in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of the invention.

3 is a conduit, and a plurality of cables 1 are installed within this conduit 3. A hard vinyl or steel vibro is fitted around the outer periphery of each of the plurality of cables 1, and a dam 8 made of soft sponge or the like is formed on the outer periphery of the cable 1 at both ends of the vibro. The closed space formed by the outer peripheral surface of each cable 1, the inner peripheral surface of the vibrotube, and the two dams 8 is filled with a water stop material 7 made of a two-component polyurethane foam polymer. Further, the space between the inner circumferential surface of the conduit 3 and the outer circumferential surface of the vibrotube is filled with a water stop material 5 similar to that described above. In the figure, 4 is a dam formed to stop the water stop material layer.

Such a pipe water stop structure for building overhead wires is formed as shown in Fig. That is, first, as shown in Figure 2,
A vibro is fitted around the outer periphery of the cable l, and a dam 8 is formed with a soft sponge or the like on the outer periphery of both ends of the cable l inside the vibro. A closed space 9 sandwiched between the two dams 8
A material for forming a water stop material is filled inside, and as shown in FIG. 3, it is cured to form a water stop material. The cable 1 having such a vibro fitted onto the outside is placed in the conduit 3 as shown in FIG. 4. Then, a dam 4 is formed using a soft sponge or the like around the outer periphery of the vibro located within the conduit 3.

Next, as shown in FIG. 1, a water stop material forming material is filled into the closed space 10 sandwiched between the two dams 4 at the pipe llIr5 and the pipe port 2, and hardened to form the water stop material 5. By doing this, the water in the building overhead wire conduit is shut off.

If a new cable is to be installed in the conduit 3 at a later date due to an increase in the number of new telephone subscribers, this will be done in the following manner. That is, using a tool such as a saw, a hole A surrounded by a dashed line is made in the water stop material 5, as shown in FIG. At this time, the diameter of the hole A is set larger than the diameter of the pipe into which the newly inserted cable is fitted.

On the other hand, a pipe is previously fitted around the outer periphery of the newly added cable in the same manner as described above. and,
The cable with this pipe fitted onto the outside is inserted into the hole A. Next, dams are formed using soft sponge at two locations in the gap between the newly inserted pipe and the water stop material. Then, the closed space between these two dams is filled with the same water stop material as described above and cured to fill the gap, thereby adding cables.

When replacing a cable that has been inserted, use the same tool as above to drill a hole along the outer periphery of the pipe that is fitted around the cable to be replaced. Then, the cable can be easily replaced by installing a new cable with a pipe fitted onto the outside in the conduit in the same manner as the cable extension described above.

In addition, as a tool used when making a hole in the above-mentioned water stop material, a scroll saw, an electric jigsaw, etc. are used. In particular, from the viewpoint of workability, etc., it is preferable to use the electric jigsaw, which has a pistol shape as shown in FIG. Teeth 11 are formed diagonally, and reciprocate in the direction of arrow B.

In the figure, 12 is an on-off switch.

In addition to the hard vinyl pipe, the pipe to be fitted onto the cable is preferably a coated steel pipe or the like from the viewpoint of resistance to knife scratches and the like.

〔Effect of the invention〕

As described above, the pipe water stop structure for building overhead wires of the present invention has the following features:
A wire rod such as a cable is inserted into a hard cylindrical body, this is inserted into a conduit, and in this state, the inside of the conduit is filled and closed with a stopper. Therefore, when adding or replacing wire rods, the wire rods are protected by the hard cylindrical body and are not damaged when drilling holes in the water stop material. Furthermore, when replacing the wire rod, it is only necessary to pull out the entire hard cylindrical body and replace it, making it possible to disassemble the water-stopping material and replace the wire rod easily and in a short time.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing a state in which a pipe is fitted onto a cable, and Fig. 3 is a sectional view showing a closed space between the outer circumference of the cable and the inner circumference of the pipe. 4 is a cross-sectional view showing a state in which a cable with a pipe fitted externally is inserted into a pipe, and FIG. 6 is a side view showing an electric jigsaw, and FIGS. 7 and 8 are explanatory diagrams showing the steps of a conventional method for forming a water stop structure for a pipeline for overhead wires in a building. It is. 1... Cable 2... Conduit port 3... Conduit 5
．． 7...Water stop material 5...Pipe Figure 8 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) A hard cylindrical body is fitted around the outer periphery of each of the plurality of wire rods inserted into the pipe, and the space between the outer peripheral surface of the wire rod and the inner periphery of the hard cylindrical body is filled with a water-stopping material, Furthermore, a water-stopping structure for a building overhead line pipeline, characterized in that a space between the inner circumferential surface of the pipe and the outer circumferential surface of the rigid cylindrical body is filled with a water-stopping material.