JPS6037683B2 - Waterproofing method and device for the end of buried cable protection tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a buried fine movement cable protection that completely waterproofs the end of the buried fine movement cable protection tube, prevents the cable from being damaged even by slight movement of the cable, and makes it easy to attach to the existing cable. This relates to a method of waterproofing the end of a tube.

Conventionally, when cables for telecommunications, gas pipes, and other cables are buried underground, protective pipes for inserting the cables are buried between each culvert, such as a manhole. Water enters the tube from the end of the protection tube facing the inner wall, corroding the cable and causing electrical problems.For this reason, conventionally, the end of the protection tube has been filled with filler.

However, in the case of a simple filling like this, the filling solidifies and condenses over time, loosens, and eventually falls off due to the spread of vibrations from the ground, so it is impossible to expect complete waterproofing. It was something that didn't exist.

Furthermore, with conventional waterproof plugs of this type, the focus is only on effective waterproofing, and because the cable is tightly and firmly fixed, there is always a certain amount of reciprocating slight movement (1 m In cases where it is essential to protect the protective tube from 100 mm to 10 mm, the end of the protective tube may be waterproofed, but this may cause damage to the cable.

The following prior art publications are known to solve these problems.

Utility Model Publication No. 45-292...Waterproof packing for conduit entrance. In the packing of this publication, a cable insertion hole is formed in the center of a cylindrical packing with cracks in all directions of the axis, and an annular fold is formed on the outer circumferential surface. It is something that is fitted in and fixed, and it is said that it is possible to fit it in gently due to the pleats.

However, the packing disclosed in this publication has the problem that the cable may be damaged by slight vibrations.
In other words, in the packing disclosed in this publication, since the contact surface is between the cable circumferential surface and the inner circumferential surface of the rubber packing, the coefficient of friction between the two is relatively large during slight vibrations, which does not have an adverse effect on the cable. be. Jitsukō 49
Publication No. 24708... Cable penetration sealing device, the device of this publication is attached to the end of a tube into which a cable is inserted, and the packing with a grease reservoir is provided at the part where the cable passes through. It is installed in the device groove, and the grease reservoir is filled with a grease-like substance, and can be completely sealed with the grease.

In the device disclosed in this publication, since the grease is in contact with the cable in a narrow area, it acts as if it were a C-ring. Therefore, it can be pointed out that in the device of this publication, the sealing performance is somewhat inferior in the case of the device in a state of slight vibration, which is the object of the present invention, because the contact area between the grease and the cable is small. The present invention solves such problems, and in a waterproofing method for the end of a buried fine movement cable protection tube, viscous A waterproof plug is applied to the cable using a silicone oil such as a lubricating oil, and then a rubber cylinder is sandwiched between the upper and lower lids, and the screws and nuts are screwed together to connect each other. Open the parallel horizontal cutting parts and apply an outer wire to the adhesive part of the buried command cable to form a thickening agent layer between the flat peripheral surface of the buried fine movement cable and the flat inner peripheral surface of the rubber cylinder. Then, by tightening the nuts and screws, the rubber cylinder expands outward and inward to tightly contact the inner wall of the protection tube and the micro-motion cable, and the rubber cylinder is formed at multiple intervals on the outer circumferential surface of the rubber cylinder. It is made up of ring-shaped ridges in the slender shape that are tightly pressed together.

Next, the present invention will be explained in detail with reference to illustrative drawings. 1 includes a central hole 2 into which a donut disk-shaped bottom cover cable made of chemical fiber such as canvas or soft synthetic resin is inserted; a plurality of spiral strips 3 fixed above the periphery of the hole 2; and a green outer periphery. It consists of a bush section 4 which is drilled to reach the center hole 2 from the center.

Reference numeral 5 denotes a soft rubber cylinder having a diameter that is approximately the same as or slightly smaller than the mouth of the protective tube, and can be relatively easily fitted with iron without being press-fitted. It consists of a hole 8 that penetrates the lower surface and engages with the spiral thread 3, and a cutting part 7 that penetrates the body and engages the cutting part 4.

Reference numeral 9 denotes a donut disc-shaped upper lid made of chemical fibers such as canvas, with a central hole 10 into which a cable is inserted, a hole 12 that connects with the holes 2 and 8, and a reinforcement projecting from the upper surface of the upper lid through which the hole 12 and a lotus are inserted. It consists of a tube 11 and a cutting section 13 that mates with the cutting sections 4 and 7.

Reference numeral 14 denotes a nut which is screwed vertically through the thread 3 protruding from the reinforcing tube 11 with a washer 15 interposed therebetween.

The cutting parts 4, 7, and 13 are formed at only one place in the drawing, but two or more places can be provided to divide the upper and lower lids and the rubber cylinder into two or three parts, and then connect them. Good, but adhesion may be poor. In addition, the lids 1 and 9 are attached to the top and bottom surfaces of the rubber cylinder 5 in order to enable screws to compress and expand the rubber cylinder 5 (note: without this, the screw punch will fit into the cylinder 5). It can be pasted.

Reference numeral 16 denotes a viscous agent such as a viscous lubricating oil that is applied to the Cape Louis near the end of the protective tube before attaching the Cape Louis to the rubber cylinder 5, but it may also be applied inside the rubber cylinder 5.

In addition, the soft oil agent 16 is applied to improve the slippage between the cape Louis and the rubber cylinder 5, and since ordinary oil may flow out of the cylinder 5, it is necessary to use a firm and viscous agent for lubrication. It functions like oil. Note that the opening in the figure is a Cape Louis protection pipe buried underground with its end facing the opening 2 of the inner wall of the manhole, and E is the manhole cover.

However, since this invention is constructed as described above, when using this invention, first, a viscous material is applied in advance to the part of the cable to which the waterproof plug is attached near the opening 2 of the inner wall of the manhole or inside the rubber cylinder 5. A softening agent having the function of a certain lubricating oil 16 is applied in advance.

Next, the screw punch 3 is inserted into the hole 8 of the rubber cylinder 5 that fits the screw punch 3 of the lower lid 1 and the hole 12 with the reinforcing tube of the upper lid 9, and the protruding end of the screw punch 3 that protrudes from the cylindrical tube 11 is inserted. Loosely tighten the nut 14 through the washer.

At this time, each cutting part 4, 7 of the lower lid 1, rubber cylinder 5, and upper lid 9 is
, 13 so that they mate. That is, a waterproof plug consisting of a lower cover 1, a rubber cylindrical body 5, and an upper cover 9 is inserted into the opening 2 of the inner wall of the manhole with the lower cover 1 first, and the upper cover 9 is inserted into the opening of the inner wall of the culvert. After the nut 14 has been firmly attached to the protective pipe opening, the nut 14, which was loosely tightened earlier, is firmly screwed on to complete the work. Therefore, in the present invention, a softening agent such as a viscous lubricating oil using silicone oil is applied to a predetermined location of the buried micro-movement cape Louis or to the flat inner circumferential surface of the rubber cylinder 5 to make the rubber cylinder 5 flat. Since the softening agent layer 16 is formed between the inner circumferential surface and the circumferential surface of the micro-movement Cape Louis, the skin of Cape Louis 1/1 to 10/ is measured while measuring the water content.
The reciprocating micro-movement of the skin caused by car driving and other causes is smoothed out by the lubricating action of the softener using silicone oil, eliminating the risk of Cape Louis damage.

This can be done easily and more effectively by the uniform thickness of the softening agent layer 16 formed by the flat inner circumferential surface of the rubber segment 5. Since the present invention is configured as described above, it exhibits the following effects.

1. In the present invention, by applying a viscous agent 16 such as a viscous lubricating oil to the entire flat inner circumferential surface of the soft rubber cylinder 5 or to the area where the rubber cylinder 5 of the buried micro-motion cable is exposed. When sliding occurs between the soft rubber cylindrical body 5 and the buried micro-movement cape lui due to the running of an automobile or the like, the softening agent 16 acts as a lubricant.

In the cable penetration sealing device disclosed in Japanese Utility Model Publication No. 49-24708, which is the prior art, the grease is located in the shape of a C-ring, so that the sealing is carried out locally, but in the present invention, the sealing is not done locally. Since the entire surface is sealed with the softening agent 16, the sealing area is excellent, and even if used for a long time, there is no possibility that the softening agent 16 will chip and damage the cape louis.

In addition, in the buried micro-tremor cable of the present invention, once it is installed, it is rarely replaced for a long period of time, so as a countermeasure to this, in the present invention, by using a softening agent 16 such as a viscous lubricating oil. This has the effect of eliminating the need for frequent inspections and monitoring until the cable is replaced.

2. The waterproof stopper is composed of a soft rubber cylinder 5, and when it is fitted with an iron, the outer wall of its body is tightly tightened with a screw punch 3 to secure the upper and lower lids. By being compressed between 1 and 9 and expanding outward, it tightly and firmly adheres to the inner wall of the protective pipe opening, so even if vibrations spread from the ground or vibrations from soft ground are applied, there is a risk of it falling off. It can produce an effect that is not possible.

Further, the above-mentioned expansion also acts on the inside of the rubber cylinder 5 to tightly press the cape louis.

3. Since the lids 1 and 9 are made of a chemical fiber material such as canvas, even if Cape Louis comes into contact with them, they will cause almost no damage compared to those made of metal, so there is no risk of causing electrical damage to the cable.

4 Lid 1, 9, each cutting part 4, 7 provided on rubber cylinder 5,
Cape Louis can be worn more easily than No. 13, and since it returns to a close contact state after being worn, there is no risk of running water.

5. Slight reciprocating movements of several thousand times or more every day, like telephone cables (
Note: Since there is a reciprocating width of 1 skin/desk to 10 kites/desk), simply attaching the rubber tube tightly and firmly to the cable will prevent the cable from moving slightly and cause damage to the cable. By applying a softening agent that makes the cable slippery, it is possible to move the cable smoothly.

6 The annular ridge 6 formed on the chest of the rubber cylinder 5 can improve the close contact with the protective tube opening, and even if the rubber cylinder 5 becomes loose, water will flow out like a spiral ridge. This prevents it from becoming easy to do.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a perspective view, Fig. 3 is a front sectional view of Fig. 2, and Fig. 4 shows a manhole. Fig. 5 is a side view showing a state in which the device of the present invention is iron-attached to each end of the cable pipe inside the longitudinal section;
This figure is an enlarged side sectional view showing the state in which the waterproof plug shown in FIG. 4 is attached. 1... lower cover, 2, 8, 10, 12... hole,
3... Ramura, 4, 7, 13... Cutting section, 5
...Rubber cylinder, 6 ... Annular protuberance, 9
...Top lid, 11...Reinforcement tube, 14...
...Nut, 15...Washer, 16...
Softener, A...cable, mouth...protective tube, c...manhole, two...mouth, wood...manhole cover. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In the method of waterproofing the end of a buried micro-motion cable protection tube, apply a softening agent such as viscous lubricating oil to the entire flat inner peripheral surface of the soft rubber cylinder or to the area where the rubber cylinder of the buried micro-motion cable fits externally. Next, a rubber cylinder is inserted between the upper and lower lids, and the waterproof plug, which is interconnected by screws and nuts, is cut horizontally parallel to the cable and inserted into the soft adhesive part of the buried micro-motion cable. A layer of softening agent is formed between the flat circumferential surface of the buried micro-motion cable and the flat inner circumferential surface of the rubber cylinder, and then the rubber cylinder is moved outward and inward by tightening the nut and screw rod. An end of a buried micro-motion cable protection tube, characterized in that it is inflated and brought into close contact with the inner wall of the protection tube and the micro-motion cable, and at the same time, narrow annular ridges formed at multiple intervals on the outer peripheral surface of a rubber cylinder are crushed and brought into close contact. waterproofing method.