JPH08109982A - Pipe sealing sheet and pipe sealing structure - Google Patents

Abstract

PURPOSE: To eliminate the troublesome work in execution and facilitate the removal of a sealing member for light in the replacement to other cable, by winding a rubber or a soft plastic foamed strip-shaped body, riding over a winding part and over an outer pipe, and tightening the periphery by a pipe fixing tool, on a wound outer pipe and a circular structure substance. CONSTITUTION: The winding starting part of a narrow width strip-shaped part 6a of a pipe sealing sheet is wound on the surface of a circular structure substance 3 positioned in an outside piping 2. When the winding diameter becomes nearly equal to the outside diameter of the outer pipe 2, the winding starting part of the wide width strip-shaped part 6b is wound continuously at least one turn on the outer pipe, including over on the outer pipe 2. Further, the strip-shaped part is firmly tightened on the outer pipe 2 and on the circular structure body 3 of the main winding part by a piping band 8 as pipe fixing tool. Through this execution, the part between the winding layers of the strip- shaped substance can be perfectly sealed easily by an adhesive later 7, and at the same time, the stage difference of the winding starting part is compressed, and the gap is reduced to zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material and a structure for sealing a gap of a substantially circular or elliptical structure (hereinafter collectively referred to as a circular structure) continuously located inside and outside an outer pipe whose one end is cut. . More specifically, the present invention relates to a material and a structure for sealing an inlet gap between a buried pipe (outer pipe) and the cable (circular structure) at a joint portion of a buried pipe such as a telephone cable or an optical fiber cable to a manhole. .

[0002]

2. Description of the Related Art In the soil, telephone cables, optical fibers, etc. are put in outer pipes and buried in them to form a cable net, and these cables are connected in various directions through manholes. However, if the entrance to the manhole of the outer pipe connected to the manhole is open, the water in the manhole that has entered during rainfall etc. will infiltrate into the next manhole through the main pipe and spread one after another. . In particular, water that has entered the manhole adversely affects the connection of various cables and impairs the stability of communication characteristics.

For this reason, conventionally, a method has been adopted in which the polyurethane raw materials are mixed on site, poured into the gap between the outer pipe and the cable located inside the outer pipe, foamed and cured, and the inlet of the outer pipe is sealed. FIG. 1 is a cross-sectional view for explaining the present method, in which a wall surface 1a of a manhole 1 is connected to an outer pipe 2 which contains a cable. In order to seal the entrance gap between the main outer pipe 2 and the cable 3, a packing material 4 such as rag is provided inside the outer pipe.
After partitioning with, the polyurethane raw materials are mixed on site, the mixed urethane raw material 5 is injected into the inlet gap between the outer pipe 2 and the circular structure 3, and further the partition is filled with a filling material 4 such as rag at the inlet. It is foamed and sealed.

As another sealing method, a polyol which is a raw material for a polyurethane foam and a polyisocyanate are reacted in advance to synthesize a polyurethane prepolymer having an unterminated NCO group. Another method is to impregnate the pre-polymer into an already-produced open-cell foam sheet, insert the main-impregnated foam sheet into the outer pipe, and foam and seal with the moisture in the air.

However, the former requires the complicated work of mixing the raw materials on site and at the same time,
There was no guarantee that the foaming undiluted solution would completely seal the gap, and at the same time, after the reaction raw material leaked from the pipe inlet and foamed and hardened, excess urethane foamed and hardened material had to be removed.
In addition, it is necessary to remove the polyurethane foam used for sealing before exchanging the internal cable for another cable, but the polyurethane foam used on-site may be the inner wall of the outer pipe or the cable located in the outer pipe. Since it was firmly adhered to the surface of the pipe and the inner diameter of the outer pipe was as thin as about 82 mm, it took a lot of time to remove the polyurethane foam inside the pipe.

In the latter case, the complicated work of mixing the raw materials on site is not performed, but like the former case, there is no guarantee of complete sealing, and the excess hardened material leaking from the sealing port is removed and replaced with another cable. It took a long time to remove the closed polyurethane foam. Since this urethane prepolymer easily reacts with water, it is used by sealing it in a film bag that is difficult to pass water and humidity. However, due to a small amount of permeated water and NCO groups in the urethane prepolymer. Due to the self-crosslinking reaction, gelation is promoted, the foaming power is lowered, and the pipe cannot be completely sealed, which is a serious problem.

[0007]

DISCLOSURE OF THE INVENTION The present invention eliminates the conventional on-site work to eliminate complicated work at the time of construction, and facilitates removal of the previous sealing material when replacing with another cable. It provides materials and structures. Another problem is to provide a sealing method that can guarantee 100% sealing, and another problem is that constant sealing work can always be performed, so that anyone can easily work in a short time without skill. It provides a method.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to change a conventional wet construction method on site to a dry construction method, and has an outer pipe of which one side is cut and a circular structure continuously located in the outer pipe. When sealing the inlet gap with the object, a rubber or soft plastic foam strip is wound on the circular structure adjacent to the cut part of the outer pipe until it becomes almost the same thickness as the outer diameter of the outer pipe. Further, it is achieved by winding a rubber or soft plastic foam strip over the wound portion and the outer pipe, and tightening the periphery of the wound outer pipe and the circular structure with a pipe fixing tool. . Further, a rubber or soft plastic foam strip having a shape in which a narrow strip and a wide strip are integrated with their long sides being equal to each other is continuously formed inside and outside the outer pipe whose one end is cut. The purpose can be easily achieved by using it to seal the entrance of the circular structure located. Further, a bonding medium such as an adhesive tape or an adhesive is integrated on the surface of the rubber or soft plastic foam strip, and each winding layer of the rubber or soft plastic foam strip is bonded to improve the winding workability. In addition, since each layer is completely integrated, the hermeticity can be improved. Further, by changing the rubber or soft plastic foam strip to a swellable foam, the swellable foam expands due to the infiltrated water to further complete the sealing, resulting in a high waterproofness. That is, according to the present invention, a rubber or soft plastic foam strip is wound around an outer pipe whose one end is cut and a circular structure continuously located inside and outside the outer pipe. By using a pipe fixture, the thickness of the telephone cable, etc. will differ, and circular structures with inconsistent shapes will be handled by simply changing the number of turns of rubber or soft plastic foam strips, and then starting winding. The present invention has been found to absorb a step due to the thickness of the rubber or the soft plastic foam band at the winding portion and the winding end portion and completely seal the winding start portion without using a silicone caulking agent or the like. completed. Here, the outer pipe refers to a plastic pipe, a metal pipe, an inorganic pipe, or the like, and a circular structure continuously located inside or outside the outer pipe whose one end is cut is a telephone cable, an optical cable, or the like passed through the outer pipe. Refers to a cable pipe, etc.

The rubber or soft plastic foam band means chlorolobrene rubber foam, nitrile rubber foam, EPDM foam soft vinyl chloride foam, polyethylene foam, polypropylene foam, ABS foam, silicone foam, Examples include polyurethane foam. The rubber or plastic foam strip used in the present invention is, in principle, a closed cell, but the swelling type and the special breathable waterproof foam are not limited to closed cells. That is, any foam having water stopping ability can be used in the present invention.

The rubber or soft plastic foam strip used in the present invention preferably has a density of 0.03 g / c.
m ^{2 to} 0.8 g / cm ³ , more preferably 0.03 g /
It is cm ^{3 to} 0.6 g / cm ³ . The reason for this is that the step due to the thickness of the winding start portion and the winding end portion of the foamed strip can be compressed by the pipe fixing tool to eliminate the gap. When the density is 0.8 g / cm ³ or more, it is difficult to properly align and wind at the time of winding, and at the same time, a step due to the thickness of the band-like material used in the present invention is formed at the winding start portion and the winding end portion. It cannot be completely compressed and sealed by the pipe fixture. If the density is 0.03 g / cm ³ or less, on the contrary, the flexibility is so large that the fastening cannot be sufficiently performed by the pipe fixing tool such as the pipe band. The hardness of the rubber or soft plastic foam strip used in the present invention is preferably 75 or less, more preferably 55 or less for a rubber hardness meter and ASKER-C type because it is manually tightened with a pipe fixing tool. The swelling type rubber or plastic foam used in the present invention may be a product similar to a generally used swelling product, and it is a foamed molded product or self-molded product obtained by mixing a super absorbent polymer with rubber or a soft plastic. There are swelling resin foam products or products that use both in combination.

The super absorbent resin is, for example, starch-sodium acrylate copolymer, polyacrylic acid soda, polyvinyl alcohol cross-linked product, saponified product of vinyl ester / ethylene carboxylic acid or its derivative copolymer, highly swelling urethane. Resins, styrene maleic anhydride copolymers, crosslinked products of vinyl alcohol / maleic anhydride reactants, polyalkylene glycols and the like. The self-swelling resin is, for example, a polyurethane foam using a polyalkylene ether polyol having a high content of polyethylene oxide.

The rubber or soft plastic foam strip of the present invention and the pipe sealing sheet have a thickness of 1 mm to 10 mm.
Is preferable, and more preferably 2 mm to 7 mm. If the thickness is thin, the step due to the thickness of the main strip at the winding start portion and the winding end portion will be small and water leakage will be difficult, but the number of windings will be large and the construction work will be difficult. The thickness of the rubber or soft plastic foam strip and the pipe sealing sheet of the present invention is appropriately determined according to the density and hardness of the rubber or soft plastic foam strip to be used, the size of the gap between the outer pipe and the circular structure, and the like. However, a thin foam strip is preferable from the viewpoint of water leakage. Further, the width of the pipe sealing sheet of the present invention is preferably 30 mm to 120 mm in the wide band-shaped portion, and particularly preferably 60 mm to 100 mm.
The width ratio of the wide band portion and the narrow band portion is preferably about 2: 1.

The rubber or soft plastic foam strip of the present invention and the winding start portion of the pipe sealing sheet may have the same thickness as the strip, but are more preferably wedge-shaped and obliquely cut. A liquid caulking agent may be provided at the winding start portion and the winding start portion of the rubber or soft plastic foam strip and the pipe sealing sheet of the present invention to eliminate a step due to the thickness of the foam strip. The liquid caulking agent may be a commercially available one, and examples thereof include a silicone caulking agent, a thiocol caulking agent, and a urethane caulking agent. The adhesive tape may be a commercially available one, for example, a rubber adhesive tape or an acrylic adhesive tape, which may be appropriately selected depending on the material used for the rubber or soft plastic foam strip and the pipe sealing sheet of the present invention. Good. The rubber or soft plastic foam strip of the present invention and the pipe sealing sheet may be fixed not only by the adhesive but also by adhesive, as long as the foam strip is wound up integrally with an adhesive or the like. Good. The pipe fixing tool used in the present invention may be any as long as it is a rubber or soft plastic foam strip of the present invention and a pipe sealing sheet that is tightened over the entire circumference, and a general wire or pipe band can be used. . The position of the pipe fixing tool is preferably two places on the outer pipe and the circular structure, but may be one place, and a wide pipe band or the like extending over the outer pipe and the circular structure may be used. . The purpose of using the tightening tool is as follows. 1) At the winding start portion of the strip-shaped article of the present invention, the thickness step of the foamed strip-shaped article is eliminated by compression with the present pipe fixing tool. Since this tightening and the rolled material is a foam, it can be completely sealed by this tightening tool without providing a caulking agent at the winding start portion. 2) In the present invention, a rubber or soft plastic foam strip is wound around a circular structure. However, even if there is a winding failure at the winding portion, the foam is pressed by the pipe fixing tool because the winding is a foam. Can be completely sealed. 3) This is because when a high water pressure is applied to the outer pipe, the winding material of the band does not come off, shift, or move by the fixing device of the pipe by the fastening device.

An example of the pipe sealing sheet of the present invention is shown in FIG. 2 as a plan view. In FIG. 2, both the narrow strip portion 6a and the wide strip portion 6b have a shape in which the long sides 6a-1 and 6b-1 are integrated together, and this shape is formed continuously. These may be joined or integrated at the joining portion 6c. Further, the adhesive layer 7 is integrated on the surface. A double-sided tape may be attached to the adhesive layer, or the adhesive may be directly applied to the strip. The point is that a substance having an adhesive property may be attached to the shape shown in FIG. The narrow strip portion 6a is a portion to be wound around a circular structure located inside the outer pipe, one side of which is cut, and may be different depending on the thickness of the circular structure, the inner diameter of the outer pipe, and the thickness of the pipe sealing sheet. The length changes. Similarly, the length of the wide strip portion 6b similarly changes depending on the thickness of the outer pipe, but it is necessary to wind at least one round.

Next, FIG. 3 for explaining a pipe sealing method using the pipe sealing sheet of the present invention shows one embodiment of the present invention. FIG. 3 is a side sectional view of the outer pipe 2 joined to the wall surface a of the manhole 1 and the circular structure 3 located in the outer pipe. The winding start portion 6a-1 of the narrow strip portion 6a of the pipe sealing sheet of the present invention shown in FIG.
Wrap around the surface of the circular structure 3 located inside. When this winding diameter becomes substantially equal to the outer diameter of the outer pipe 2, the winding start portion 6b-1 of the wide strip portion 6b is continuously wound including the outer pipe 2. The wide strip 6b of the present invention is wound around the outer pipe at least once. Further, a pipe band 8 as a pipe fixture is firmly closed on the outer pipe 2 and the circular structure 3 of the main winding portion. By this construction, the gap between the winding layers of the strip can be easily completely sealed by the adhesive layer, and at the same time, the step at the winding start portion is compressed and the gap disappears. In order to achieve the present invention, the above-mentioned shape of FIG. 2 is particularly preferable, but the following method can achieve the object of the present invention and are included in the scope of the present invention. The narrow strip portion 6a and the wide strip portion 6b in FIG. 2 are not integrated but are separately separated. Similar to the above, the rubber strips or plastic foam strips are first wound around the circular structure in this separation strip, and when the winding diameter becomes almost equal to the outer diameter of the outer pipe, the wide strip is formed. This object can be achieved by integrally winding the above-mentioned strip on the outer diameter of the outer pipe, and finally by compressing and fixing with a tightening band. Further, in the above method, the airtightness can be further improved by sticking an adhesive tape on one side of the rubber or plastic foam strip.

Another embodiment of the present invention is shown in FIG. FIG. 4 is an enlarged side view of the outer pipe connected to the manhole. A rubber or soft plastic foam strip 6 is wound around a circular structure 3 located inside an outer pipe 2 connected to a wall surface 1a of a manhole. After it has the same thickness as the outer pipe, wind it up more than two times. Next, the lastly wound two or more wound layers are fastened and fixed in the outer pipe direction by the inside-out pipe band 8. A boundary line between the inside-out layer and the inside-out layer may be provided with a cut within a range that does not extend over the entire width to facilitate turning over or not. Finally, the circumference of the rubber or soft plastic foam strip is wrapped around the circular structure and fixed with a piping band. Also, if the wrapping rubber or soft plastic foam strip layer on the circular structure is thick, it will be difficult to tighten it with the piping band. Therefore, except for the winding layers 2 to 3 on the circular structure, the entire width up to the inside out layer can be obtained. It is preferable that the pipe fixing layer on the circular structure is partially thinned so that the effect of the pipe band is improved by partially removing the pipe fixing layer on the circular structure.

[0017]

[Function] Generally, telephone cables and optical cables differ in diameter depending on the capacity to be transmitted, and there are many types depending on the thickness. Moreover, these cables are not always circular, but very often elliptical with each part distorted, and there is no one with the same shape. It is not possible to seal the gap with the cable by using a fixed packing molded for these various cables and deformed cables, and a method of sealing the gap with reactive urethane foam has been used so far. However, it took a huge amount of time to remove the polyurethane foam sealant when exchanging the cable, which is a complicated work such as a mixing reaction in the field. The present invention is to solve these problems, by winding a rubber or plastic foam strip around the circumference of a circular structure such as a cable, and further spread over the wrapped rubber or plastic foam strip and the outer pipe. Wrap a rubber or plastic foam strip, and at the end, tighten and fix the winding circumference with a tightening tool. The main operation of the pipe sealing sheet and the pipe sealing structure of the present invention will be described below. First of all, the present invention uses a foam as a pipe sealing sheet. When the foam strip is wound around the circular structure and the outer pipe, a step due to the thickness of the foam strip is always generated at the winding start portion and the winding end portion. In the case of a non-foamed band, it is not possible to eliminate the step due to the thickness of the band because the non-foamed band cannot be freely deformed even if it is tightened with a fastening tool such as a piping band. Since the pipe sealing sheet used is a foam, the bubbles of the foam are compressed by tightening with a pipe band, etc. Furthermore, the deformation flexibility coming from the space of the bubbles eliminates the step due to the thickness of the foam strip. It turned out to be possible.

Secondly, the present invention uses a deformed strip-shaped foam sheet as a pipe sealing sheet. Wrap this foam sheet around the circumference of a circular structure such as a cable,
Depending on the number of windings, it is possible to completely seal the pipe regardless of the number of windings of a circular structure of any thickness. No gap should be created between the layers of the wrapped foam, but since this pipe sealing sheet is a foam sheet, the wrapping force compresses the foam in the thickness direction during wrapping, and Due to the flexibility, it can be wound without any gap between the winding layers. In addition, when winding, the winding direction may be bent so that the sheets cannot be properly aligned and wound, but these cause water leakage that causes a gap between the layers of the foam strip sheet. However, the pipe sealing sheet of the present invention has excellent flexibility because it is a foam sheet, even if the winding direction changes a little during winding,
The winding direction can be corrected by the space and expansion of the air bubbles, and there is no gap between the winding layers of the rolled-up belt-like sheet that is properly aligned without forming a gap. In the case of a non-foamed band, since it does not have air bubbles inside, it is inferior in flexibility and the correction of the winding direction becomes a winding interlayer gap.

In the present invention, the wrapped rubber or plastic foam strip is tightened by using a pipe fixing tool such as a piping band. However, since the wrapped strip is a foam, the air layer is compressed, and the rubber or It acts to eliminate the step due to the thickness of the beginning and end of the plastic foam strip. In addition, even if a gap is formed between the layers around which the foamed strip of the present invention is wound, the gap can be eliminated by pressing by the final tightening,
It has the effect of preventing the foam strips from slipping off or coming off when high pressure is applied to the piping.

In the present invention, an adhesive tape may be placed on one side of a rubber or plastic foamed strip to wind the circumference of a circular structure such as a cable. At the same time, it prevents "collapse" at the time of winding the wound foam foam and after winding.

The pipe sealing sheet of the present invention is a rubber or soft plastic foam strip having a shape in which a narrow strip portion and a wide strip portion are integrated so that their long sides are the same. Even with a circular structure such as a type of cable, it is possible to use a single type of pipe sealing sheet by adjusting the length of the narrow part according to the thickness of the narrow structure of the circular structure such as the cable. Can be easily sealed. When the narrow strip and the wide strip are not integrated as in the pipe sealing sheet of the present invention, after winding the narrow strip around the structure such as the cable, another A wide strip is wrapped around the main winding strip and the outer pipe. According to this method, there is a risk of water leakage at two positions, namely, a winding start part and a winding end part of a narrow strip, and two places on the outer pipe of the wide strip and the winding circular structure, that is, four places in total. On the other hand, in the pipe sealing sheet of the present invention, only the winding start portion of the narrow strip and the winding start portion of the wide strip are only two places. The pipe sealing sheet of the present invention may be a general rubber or plastic foam,
The swelling type is more preferable. In the case of the swelling type, the step due to the thickness of the two winding start parts of the foamed band can be closed by swelling, and at the same time, even if a gap is created in each winding part, the swelling effect due to water It can be expanded and sealed. Especially when used as an integral part of the adhesive tape, not only the wound layer of each foam strip is integrated, but also the swelling elongation of the foam strip in the longitudinal direction is eliminated and the expansion of the foam strip in the thickness direction is limited. Especially, the water stop pressure becomes large.

[0022]

Example 1 Inner diameter 82 mm, outer diameter 90 m cut on one side
The outer diameter is 40mm and the density is 0.150g / c.
It was carried out using a chloroprene rubber foam having m ³ and a thickness of 30 mm. A narrow strip-shaped portion having a width of 40 mm and a length of 1600 mm and a wide strip-shaped portion having a width of 80 mm and a length of 600 mm are integrated to form a side having a length of 1600 mm and a side having a length of 600 mm. The foamed strip having the above-mentioned shape was cut out to prepare a pipe sealing sheet of the present invention, and a double-sided adhesive tape was laminated on one surface of the foamed strip. Next, wrap the end of the narrow part of the pipe sealing sheet around the outer circumference of the internal cable located outside one cut part of the outer pipe, and its diameter is almost equal to the outer diameter of the outer pipe, that is, the outer pipe. When the surface of the strip and the surface of the wound strip were continuously positioned on the same line, the wide portion of the strip was wound up integrally to a position about 40 mm inside the outer pipe.
Next, the winding portion of the outer pipe and the two places on the strip wound on the telephone cable were fastened and fixed with piping bands. Next, water was pressed into the pipe to apply a water pressure of 1 kg / cm ² , but no water leaked from the pipe sealing part.

[0023]

[Example 2] 82 mm in outer diameter and 90 mm in outer diameter located on the outside of a continuous telephone cable having an outer diameter of 40 mm and having one side cut off
The cut surface of the outer pipe of mm has a density of 0.4 g / cm ³ and a thickness of 2
An attempt was made to seal with a mm swellable rubber foam. The rubber foam had an expansion ratio of about 1.5 times in the thickness direction when immersed in water. This foam is 40 mm wide and 2400 m long
A narrow strip portion of m and a wide strip portion having a width of 80 mm and a length of 600 mm are cut out into a shape in which the long side of 2400 mm and the long side of 600 mm are integrated in the same shape, and the pipe is sealed according to the present invention. A sheet was prepared, and then a double-sided adhesive tape was laminated on one side of the foamed strip. Next, wind the winding start part of the narrow strip of the pipe sealing sheet on the outer periphery of the internal cable adjacent to one cut part of the outer pipe, and the winding diameter is almost equal to the outer diameter of the outer pipe, that is, When the surface and the surface of the wound strip come to be located substantially on a straight line, the wide band of the pipe sealing sheet of the present invention is rolled up integrally including the position where the wide band is about 40 mm from the cut surface of the outer pipe. It was Next, pipe bands were set and strongly tightened on the winding portion of the outer pipe and the winding portion on the cable, and a water pressure of ² kg / cm ² was applied to the inside of the pipe, but no water leaked from the pipe sealing portion.

[0024]

Industrial Applicability According to the present invention, a rubber or soft plastic foam strip is used to seal the entrance of a circular or elliptical structure such as a continuous telephone cable located inside or outside of an outer pipe whose one end is cut, or an optical cable. Wind it on a circular structure adjacent to the cut part of the outer pipe until it becomes almost the same thickness as the outer diameter of the outer pipe, and further, cover the wound part and the outer pipe with a rubber or soft plastic foam strip. The inlet can be easily and completely sealed by winding it and tightening it with a pipe fixing tool. The circular or elliptical structures located inside these outer pipes are not perfectly circular or elliptical, and rubber packing, etc. cannot be used because the shapes are not constant, and so far, mixing of raw materials and injection foaming have not been performed on site. Such complicated work has been done, but by solving these problems, anyone can easily and reliably seal the pipe in a short time and easily when replacing the structure located in the outer pipe such as the telephone cable. The previous sealing material can be removed in a short time. Furthermore, even if the structure located in the pipe is circular or elliptical or flat, the pipe can be sealed in the same manner.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing sealing of a joint portion of a buried outer pipe in a manhole by conventional foaming in-situ polyurethane.

FIG. 2 is a plan view of the pipe sealing sheet of the present invention.

FIG. 3 is a cross-sectional view showing one construction example using the pipe sealing sheet of the present invention shown in FIG.

FIG. 4 is a sectional view showing another pipe sealing structure of the present invention.

[Explanation of symbols]

1 Manhole 1a Wall of manhole 2 Outer pipe 3 Circular or elliptical structure (cable) 4 Filling material such as batter 5 Mixed polyurethane raw material 6 Rubber or plastic foam strip 6a Rubber or plastic foam strip narrow strip 6a -1 Rolling start of narrow strip of rubber or plastic foam strip 6b Wide strip of rubber or plastic foam strip 6b-1 Rolling start of wide strip of rubber or plastic foam strip 7 Adhesion Layer 8 piping band

Claims (5)

[Claims] 1. A structure for sealing an inlet gap between an outer pipe whose one end is cut and a substantially circular or elliptical structure continuously located inside and outside the outer pipe, wherein a rubber or soft plastic foam strip is provided. It is wound on a circular or elliptical structure adjacent to the cut portion of the outer pipe until it has a thickness almost the same as the outer diameter on the outer pipe, and further, it is covered with rubber or rubber over the wound portion and the outer pipe. A pipe sealing structure having a structure in which a soft plastic foam band is wound and a pipe fixing tool is installed on the wound outer pipe and a circular or elliptical structure. 2. The pipe sealing structure according to claim 1, wherein the surfaces of the wound rubber or the soft plastic foam strip are integrated with a joining medium. 3. A rubber or soft plastic foam strip having a shape in which a narrow strip and a wide strip are integrated with their long sides being the same, and one of which is a cut outer pipe and the other. A pipe sealing sheet that seals the inlet of a substantially circular or elliptical structure continuously located inside and outside the pipe. 4. The pipe sealing sheet according to claim 3, wherein an adhesive layer is provided on one surface of the rubber or soft plastic foam strip. 5. The pipe sealing sheet and pipe sealing structure according to claim 1, wherein the rubber or soft plastic foam strip is a swelling foam.