JP2017042919A - Pipe covering body, and repairing method and repair structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe covering body capable of securing a water stop function by a water expansion member for water stop over a long period, and a method for repairing a pipeline and a pipeline repair structure using the same.SOLUTION: There is provided a pipe covering body 10, in a pipe covering body having a cylindrical body 12 made of a hardening resin for covering the parts 100a, 100b to be repaired in an existing pipe 100 from the inside face so as to be repaired, at least two parts on the outer circumferential face of the cylindrical body 12 are provided with water expansion members 14-1, 14-2 for water stop for a cylindrical body including water expansible fiber continuously in the circumferential direction, and, the surface of the outer circumferential face of the cylindrical body 12 between the two water expansion members 14-1, 14-2 for water stop for a cylindrical body is provided with a non-expansion member 16 for a cylindrical body having water expansibility lower than that of the water expansion members 14-1, 14-2 for water stop for a cylindrical body continuously in the circumferential direction thereof.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pipe covering for covering an inner surface of a pipe when a pipe such as a sewage pipe is aged, a repair method and a repair structure using the pipe cover.

  Existing pipes such as sewage pipes deteriorate with long-term use, and their useful life is generally about 50 years. Therefore, the number of sewer pipes that have exceeded the useful life is increasing year by year. In particular, sewage pipes that have deteriorated are deformed or cracked, which not only lowers the function of sewage flow, but also creates cavities in the ground due to the flow of groundwater and earth around the sewage pipe into the sewage pipe. It is also the cause of the ground collapse. In addition, sewage pipes buried in the ground may be easily affected by ground fluctuations such as earthquakes, and at present, some kind of repair is required at a predetermined time.

  As a method for repairing a sewer pipe, a method described in Patent Document 1 is known. In the method of Patent Document 1, a tube covering body having an elastic member that covers the entire outer peripheral surface of the edge of a cylindrical body made of a thermoplastic resin is installed on the inner surface of an existing pipe. FIG. 8 is a schematic cross-sectional view showing a state in which repair is performed by the method described in Patent Document 1. As shown in the figure, the existing pipe 100 has a crack 100a and a separation 100b between the unit pipes 100-1 and 100-2 constituting the existing pipe 100, and the existing pipe 100 and the resin tubular body 112 are separated from each other. In between, the water expansion members 114-1 and 114-2 for stopping water are partially provided. The water expansion members 114-1 and 114-2 for water stop are respectively disposed on both sides in the axial direction with reference to the crack 100a and the separation 100b of the existing pipe 100.

  According to this method, the groundwater that has flowed into the existing pipe 100 from the outside of the existing pipe 100 through the crack 100a and the separation 100b passes through the minute gap between the existing pipe 100 and the cylindrical body 112, and the water for stopping water. When the expansion members 114-1 and 114-2 are reached, the water expansion fibers contained in the water expansion members 114-1 and 114-2 expand and the water stoppage is exhibited there. Inflow into 100 is blocked.

JP 2014-188946 A

  However, when the water expansion fiber absorbs water and expands, the shape of the fiber collapses and the fiber becomes fragile, so the expanded fiber passes through a minute gap between the existing pipe and the cylindrical body, and the repair target portion of the existing pipe (The crack 100a and the separation 100b shown in FIG. 8) may flow out of the existing pipe, and the water stop function once acquired may deteriorate with time.

  Accordingly, an object of the present invention is to provide a pipe covering that can ensure a water stop function by a water expansion member for water stop over a long period of time, a pipe repair method and a pipe repair structure using the pipe cover.

  In order to solve the above-mentioned problem, the tube covering according to claim 1 is a tube covering having a cylindrical body made of a curable resin for covering and repairing a repair target portion of an existing pipe from the inner surface. A cylindrical body water-stopping water expansion member including water-expanding fibers is continuously provided in at least two locations on the outer peripheral surface of the cylindrical body in the circumferential direction. On the outer peripheral surface of the tubular body between, the non-expanding member for tubular body having a lower water expandability than the water expansion member for water stopping for the tubular body is disposed on the outer periphery of the tubular body in the circumferential direction. It is characterized by being provided continuously.

  When this pipe covering is installed in an existing pipe, a non-expandable member can be interposed between the water expansion member for water stop and a repair target portion such as a crack or breakage. Therefore, even if the water expansion fiber of the water expansion member for water stop absorbs groundwater and expands, and the fiber becomes brittle, the presence of the non-expansion member prevents the expanded fiber from moving to the repair target side. can do. Therefore, the expanded fiber can be prevented from flowing out, and the water stop function of the water stop water expansion member can be maintained over a long period of time.

  The tube covering body according to claim 2, wherein the tubular body has a tubular portion formed by branching from the tubular body, and includes a water expansion fiber on an outer peripheral surface of the tubular portion. A water expansion member for water stop for a tubular part is provided continuously in the circumferential direction, and on the side of the tubular body with respect to the water expansion member for water stop for a cylindrical part, the water expansion member for water stop for the cylindrical part A non-expandable member for a cylindrical portion having a low water expandability is provided continuously on the outer periphery of the cylindrical portion in the circumferential direction.

  For example, in the connection part between pipes such as the connection part of the sewer main pipe and the attachment pipe, groundwater often flows into the pipe line from the gap at the boundary part. Even if it is a location where easy water leakage is likely to occur, a repair structure capable of maintaining the water stop function for a long time can be obtained by the water expansion member for water stop and the non-expansion member.

  The tube covering according to claim 3 is further provided on the opposite side of the tubular body non-expandable member side with respect to the tubular body water stop water expansion member, and further on the tubular body water stop water expansion. A non-inflatable member for a cylindrical body having a lower water expansion property than the member is provided continuously on the outer periphery of the cylindrical body in the circumferential direction.

  By placing a non-expandable member not only on the repair target location side but also on the opposite side of the tubular body water stop water expansion member as a reference, the expanded fiber flows out not only from the repair target location side but also from the opposite side. Therefore, the water stop function can be maintained for a longer period.

  The tube covering according to claim 4 is further provided on the opposite side of the tubular portion non-expandable member side with respect to the tubular portion water stop water expansion member, and further on the tubular portion water stop water expansion. A non-expandable member for a cylindrical part having a lower water expansion property than the member is provided continuously on the outer periphery of the cylindrical part in the circumferential direction.

  According to this configuration, similarly to the third aspect, the expansion fiber can be prevented from flowing out not only from the repair target location side but also from the opposite side with reference to the water expansion member for water stopping for the cylindrical portion. It is possible to maintain the water stop function for a longer period of time.

  Another object of the present invention is an existing pipe repair method for repairing a repair target portion of an existing pipe, the pipe covering body being introduced in an uncured state of the tubular body, and the introduction An existing pipe repairing method comprising: a pressing step of pressing the pipe covering body against the inner surface of the existing pipe; and a curing step of curing the tubular body of the pipe covering body; and This can also be achieved by an existing pipe repair structure characterized in that the pipe cover is installed inside.

  ADVANTAGE OF THE INVENTION According to this invention, the pipe covering body which can maintain a water stop for a long term can be provided. Therefore, the flow-down function can be maintained for a long period of time, and the formation of underground cavities due to the inflow of groundwater into the pipe line and the accompanying ground depression can be prevented for a long period of time.

It is a perspective view showing an example of a pipe covering object of the present invention. It is a schematic sectional drawing of the repair apparatus used in order to install a pipe | tube covering. It is a schematic sectional drawing which shows the process in which the pipe covering body of FIG. 1 is installed in a sewer pipe. It is a schematic sectional drawing which shows the repair structure of this invention. It is a schematic sectional drawing which shows the other example of the repair structure of this invention. It is a perspective view which shows other embodiment of a pipe | tube covering. It is a schematic sectional drawing which shows the installation state to the existing pipe | tube of the pipe | tube covering of FIG. It is a schematic sectional drawing which shows the conventional repair structure.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of an embodiment of a tube covering according to the present invention. As shown in the drawing, the tube covering 10 of the present embodiment has a cylindrical body 12 made of a curable resin, and the outer peripheral surface 12a is provided in the vicinity of both ends of the cylindrical body 12 in the axial direction. Band-shaped water-stopping water expansion members 14-1 and 14-2 are provided continuously in the circumferential direction so as to cover the entire circumference. Between the water stop water expansion members 14-1 and 14-2 on the outer peripheral surface 12 a of the cylindrical body 12, a strip-shaped non-expansion member 16 is continuously provided in the circumferential direction.

It is preferable that the water expansion members 14-1 and 14-2 for still water use exhibit the expansibility by including the water expansion fiber which expand | swells by absorbing water. Specifically, a fiber material (for example, non-woven fabric, woven fabric, knitted fabric, etc., preferably felt) composed of fibers containing water-expandable fibers can be used. It is preferable that the water expansion members 14-1 and 14-2 for water stop have fine voids by being composed of fibers and have a compressible structure. The thickness after compression is generally ½ or less, preferably １ ／ or less of the thickness before compression. The basis weight of the water expansion members 14-1 and 14-2 for water stop is generally 200 to 1000 g / m ² , preferably 300 to 600 g / m ² .

  As the water expansion fiber, a fiber formed from a water expansion polymer such as sodium polyacrylate can be used. The water-stopping water expansion members 14-1 and 14-2 may be entirely made of water-expandable fibers, or a combination of water-expandable fibers and non-water-expandable fibers (polyethylene fibers, polyester fibers such as PET). It may be a material. In the case of a fiber material in which water-expandable fibers and non-water-expandable fibers are combined, a good water stoppage can be obtained when the mass ratio of the water-expandable fibers is 40% or more, preferably 50% or more, particularly 70 to 80%. Is preferable.

  When the water expansion members 14-1 and 14-2 for water stop absorb water, the water expansion fibers contained therein expand, the internal voids are blocked, the route through which the water passes is cut off, and the water stop is exhibited. .

  It is preferable that the water expansion members 14-1 and 14-2 for water stop are in a state compressed in an installed state in an existing pipe. Thereby, the fine space | gap in the water expansion | swelling material 14-1 for water stop, 14-2 reduces, and the outstanding water stop effect by the water expansion effect is exhibited. For example, the thickness of the water expansion members 14-1 and 14-2 for water stop is, for example, 3 to 15 mm in the uncompressed state before installation (normal state), and is 1 to 5 mm, for example, in the compressed state. In addition, in this invention, unless otherwise indicated, the water expansion member for water stop shall include both the state before expanding with water, and the state after expanding.

  On the other hand, the non-expandable member 16 has a lower water expandability than the water stop water expandable members 14-1 and 14-2. Preferably, it is a compressible member similar to the water-stopping water expansion member, and is a belt-like member. Specifically, fiber materials (for example, non-woven fabric, woven fabric, knitted fabric, etc.) mainly composed of non-expandable fibers, foams, and the like can be used. As the material of the fiber material, polyester fibers such as PET and synthetic fibers such as polyethylene fibers can be used. In the case of a fiber material, it may be mainly composed of non-expandable fibers and may contain water-expandable fibers as a secondary component, but the mass ratio of non-expandable fibers exceeds 60%, preferably 80%. Above, more preferably 90% or more, and even more preferably 100%. As said foam, foams, such as polyethylene, a polypropylene, a polyurethane, can be used.

  When the non-expandable member 16 is a compressible member, it is, for example, 3 to 15 mm in the uncompressed state before installation (normal state), and is, for example, 1 to 5 mm in the compressed state. It is preferable to have compressibility equivalent to the water-stopping water expansion materials 14-1 and 14-2.

  The width | variety of the water expansion members 14-1 for water stop, 14-2 should just be able to exhibit water stop, for example, is 100-300 mm. The width of the non-expandable member 16 only needs to cover the repair target portion of the existing pipe, and is, for example, longer than 0 mm and not more than 2500 mm.

  As the cylindrical body 12 made of a curable resin constituting the tube covering 10, those conventionally used as a lining material for repairing a tube can be used. For example, a substrate such as glass fiber impregnated with a photocurable resin composition or a thermosetting resin composition, and a protective film laminated on the inner surface or both surfaces as necessary can be used. The photocurable resin composition and the thermosetting resin composition may be those conventionally used. The light is not particularly limited, but from the viewpoint of workability, ultraviolet light or visible light, preferably ultraviolet light can be used. The cylindrical body 12 is flexible before being cured, and can be easily introduced into the existing pipe. The magnitude | size of the cylindrical body 12 is suitably adjusted according to the magnitude | size of the existing pipe | tube to repair.

  In the case where the protective film is provided on the outer surface of the base material impregnated with the resin composition, the water expansion members 14-1, 14-2 and the non-inflatable member 16 for water stop are, for example, an outer surface of the protective film with an adhesive. It can provide in the outer peripheral surface of the cylindrical body 12 by affixing on. On the other hand, when the protective film is provided only on the inner surface of the base material impregnated with the resin composition and is not provided on the outer surface, the inside of the water expansion members 14-1, 14-2 for water stop and the non-expansion member 16 An intervening film such as a polyethylene film is provided inside the water expansion members 14-1 and 14-2 and the non-expansion member 16 for water stop so that the resin composition does not penetrate into the water composition, and an adhesive is applied to the inner surface of the film. By sticking to the tubular body 12, the water expansion members 14-1, 14-2 for water stop and the non-expansion member 16 can be installed.

  Although there may be a gap between the water expansion members 14-1 and 14-2 and the non-expansion member 16, the water expansion member 14-1, the non-expansion member 16 and the water expansion member 14-1, as shown in FIG. It is preferable that there are no gaps between the water expansion member 14-2 for water stop and these are provided continuously arranged.

  Next, a method for repairing an existing pipe using the pipe covering 10 will be described. FIG. 2 is a schematic cross-sectional view showing an example of a repair device that can be used to install a pipe covering on an existing pipe.

  This repairing device 60 is mainly composed of a cylindrical main body 62 made of a rubber material that can expand and contract in the radial direction, and the cylindrical main body 62 is formed by a pair of side lids 64 at both ends thereof. It is sealed. In addition, a fluid introduction pipe 66 that allows compressed air to freely enter and exit is provided inside the cylindrical main body 62, and a traveling means 68 that enables the repair device 60 itself to move is provided. The cylindrical main body 62 is configured to hold the tube covering 10 shown in FIG. 1 in a state of being wound around the outer periphery thereof. After introducing the pipe covering 10 into the existing pipe using the repairing device 60, the tube covering 10 is fixed to the predetermined pipe by curing the cylindrical body of the pipe covering 10 while being pressed against the inner surface of the existing pipe. Can be installed in position.

  Next, the operation of covering the inner surface of the existing pipe with the pipe covering 10 will be described with reference to FIG. 3. First, the repair device 60 holding the pipe covering 10 shown in FIG. It is pulled in from a normal manhole side by pulling with a wire (not shown) and moved to a predetermined repair location. At that time, the inside of the cylindrical main body 62 of the repair device 60 is in a reduced diameter state where compressed air is not sent, and the repair device 60 equipped with the tube covering 10 travels within the existing pipe 100 without any problem. be able to.

  After reaching the repair location, the position is set so that the portions 100a, 100b to be repaired are covered by the portion of the non-expandable member 16 of the tube covering 10, and then the fluid introduction pipe 66 is provided inside the cylindrical main body 62. Compressed air is supplied so that the internal atmospheric pressure (gauge pressure) is, for example, 0.03 to 0.15 MPa, and these are expanded to press the tube covering 10 against the inner surface 100 c of the existing tube 100. When pressed, the outer peripheral surface of the tubular body 12 where the water-stopping water expansion members 14-1, 14-2 or the non-expanding member 16 are not provided is in close contact with the inner peripheral surface 100 c of the existing pipe 100, and The water expansion members 14-1 and 14-2 for water and the non-expansion member 16 are compressed by the pressing force. Next, the resin composition of the cylindrical body 12 is cured by light irradiation or heating by the light irradiation means or heating means 70 provided in the repair device 60. Although the cylindrical body 12 is slightly contracted from a state where the diameter of the cylindrical body 12 is expanded to the maximum due to the curing contraction that occurs at the time of curing, the water expansion member 14-1, 14-2 or the non-expansion member 16 for stopping water is restored from the compressed state. This prevents the formation of gaps in the curing stage. In this state, the water-stopping water expansion members 14-1 and 14-2 and the non-expansion member 16 are slightly restored from the maximum compression state due to the curing shrinkage of the cylindrical portion 12, but are still in the compression state. In this compressed state, the expansion pressure of the water stop water expansion members 14-1 and 14-2 is equal to or higher than the external water pressure due to the ground water of the water stop water expansion members 14-1 and 14-2 via the repair target portion 100a (for example, 0.1 MPa or more) is advantageous in that excellent water stoppage can be obtained. In the present invention, the repair target portion includes not only a case where a crack or breakage actually occurs, but also a portion where a crack or breakage may occur in the future.

  Then, after irradiating light or heating and cooling the cylindrical body 12 by natural cooling or sending cool air, the compressed air of the cylindrical main body part 62 of the repairing device 60 is discharged, and the repairing device 60 is removed. . Thereby, the inner surface area | region including the repair object location 100a, 100b of the existing pipe | tube 100 is coat | covered with the pipe | tube covering 10. The light irradiation means of the repair device 60 includes a light irradiation lamp. In addition, the heating means can be configured by using steam as a fluid for expanding the cylindrical main body 62 or by installing a heater, a heating infrared lamp, or the like inside the repairing device 60. .

  FIG. 4 shows the repair structure after the repair method is completed. In the repair structure formed by the above method, the water expansion members 14-1 and 14-2 and the non-expansion member 16 are provided between the existing pipe 100 and the tubular body 12, and the water expansion member 14 for water stop is provided. -1,14-2 and the repair target portions 100a and 100b, the non-inflatable member 16 is interposed. Groundwater that has flowed into the existing pipe 100 through the cracks 100a and the spacing portions 100b between the unit pipes 100-1 and 100-2 constituting the existing pipe 100 passes through the non-expandable member 16 and the water expansion member 14- When reaching 1, 14-2, the water expansion fibers contained in the water expansion members 14-1, 14-2 for water stop expand, and water stoppage is exhibited. And even if the water expansion fiber of the water expansion members 14-1 and 14-2 for water stop expands and the fiber becomes brittle, the expanded fiber passes the non-expansion member 16 in the repair target portions 100a and 100b. Therefore, the expanded fiber is prevented from moving to the repair target portions 100a and 100b. Therefore, the outflow of the water expansion fiber can be prevented, and the water stop effect by the water stop water expansion members 14-1 and 14-2 can be maintained over a long period of time.

  Further, when the water stop water expansion members 14-1 and 14-2 and the non-expansion member 16 are formed of a compressible material, in the illustrated installation state, the water stop water expansion member due to the pressing force at the time of installation. 14-1, 14-2 and the non-expandable member 16 are arranged in a compressed state than the state before the installation, and there are fewer internal voids. Therefore, even if the situation where the cylindrical body 12 and the inner surface of the existing pipe 100 are separated afterwards, the space between them is filled with the restored water-stopping water expansion members 14-1 and 14-2 and the non-expansion member 16. Therefore, the formation of a gap due to the deformation of the existing pipe 100 can be prevented. Moreover, at the time of installation, since the air gap is reduced in the water expansion members 14-1 and 14-2 for water stop due to compression, the air gap is more easily blocked by the expansion of the water expansion fiber, so that it is earlier and more reliably. Water stoppage can be obtained.

  Therefore, even if the existing pipe 100 is deformed, no gap is formed between the existing pipe 100 and the cylindrical body 12, and the water-stopping property is ensured for a long time as described above. A complete repair structure can be obtained. In addition, in this Embodiment, although the example which provided the water expansion member for water stop for cylindrical bodies in two places on the outer periphery of a cylindrical body was shown, even if it provides the water expansion members for water stop in three or more places, Good. In that case, a non-expanding member can be provided between the plurality of water-stopping water expansion members.

  FIG. 5 is a cross-sectional view showing a repair structure according to another embodiment. In the figure, the same components as those of the above-described embodiment are indicated by the same reference numerals. As shown in the drawing, on the further outside of the water expansion members 14-1, 14-2 for water stop, that is, on the opposite side to the non-expansion member 16 side with reference to the water expansion members 14-1, 14-2 for water stop, Further, non-expandable members 36-1 and 36-2 are provided, respectively.

  By providing the non-expanding members 36-1 and 36-2 at these positions, the following effects can be obtained. That is, when the groundwater that has flowed into the existing pipe 100 through the crack 100a reaches the water stop water expansion members 14-1 and 14-2, it is absorbed here and the water stop water expansion member expands. Then, the expanded fibers of the water expansion members 14-1 and 14-2 for water stop are in a form that is brittle and easily collapsed. Since the non-expandable member 16 is disposed on the repair target portions 100a and 100b of the water stop water expansion members 14-1 and 14-2, the fibers of the water stop water expansion members 14-1 and 14-2 are repair target portions. Although movement to the 100a and 100b sides can be prevented, it may flow out through a minute gap between the existing pipe 100 and the cylindrical body 12 in the opposite direction. Therefore, by disposing further non-expandable members 36-1 and 36-2 at the illustrated positions, the expanded fibers of the water expansion water expansion members 14-1 and 14-2 are opposite to the repair target portions 100a and 100b. It becomes possible to prevent flowing out from a minute gap between the outer peripheral surface of the end portion of the cylindrical body 12 and the inner peripheral surface of the existing pipe 100 by flowing in the lateral direction.

  In the present invention, not only the pipe covering corresponding to the repair target location such as a crack generated in the existing pipe described above, but also other parts, for example, a connecting part between pipes such as a connecting part between a sewer main pipe and a mounting pipe. It may be a tube covering to be coated. FIG. 6 is a perspective view showing a pipe covering body for covering the connecting portion between the sewer main pipe and the attachment pipe.

  The tube covering body 40 includes a cylindrical body 42 that is a main body thereof, and further includes a cylindrical portion 43 that is branched from the cylindrical body 42. As with the tube covering 10 shown in FIG. 1, the water expansion members 44-1 and 44-2 for water stop are continuously provided on the outer peripheral surface of the axial end of the cylindrical body 42 in the circumferential direction over the entire circumference. The non-expandable member 46-1 is formed on the outer peripheral surface of the tubular body 42 between the water expansion members 44-1 and 44-2 for stopping water. In the other areas, the entire circumference is continuously provided in the circumferential direction.

  And on the outer peripheral surface 43a of the cylindrical part 43, the strip-shaped water expansion member 44-3 for water stop is continuously provided in the circumferential direction over the perimeter. Further, on the opposite side of the tubular portion end 43b of the water stop water expansion member 44-3, that is, on the tubular body 42 side, non-expansion having a lower water expandability than the water stop water expansion member 44-3. The member 46-2 is provided on the outer peripheral surface of the cylindrical portion 43.

  FIG. 7 shows a schematic cross-sectional view showing a state in which the pipe covering body 40 is installed at the connection portion between the sewer main pipe and the attachment pipe. In the drawing, in the connection portion between the sewer main 100 and the attachment pipe 102, groundwater tends to flow into the sewer main 100 and the attachment pipe 102 at the boundary between the pipes.

  As shown in the drawing, the water expansion members 44-1 to 43-3 for the still water are disposed between the sewer main pipe 100 and the tubular body 42 or between the attachment pipe 102 and the tubular portion 43. The non-expandable member 46 is disposed between the sewer main pipe 100 and the cylindrical body 42, or between the attachment pipe 102 and the cylindrical portion 43, or in the ground water that has entered the pipeline through the boundary. -1 and 46-2, when reaching the water-stopping water expansion members 44-1 to 44-3, the water-expanding fibers contained therein expand and water-stopping properties are obtained. The presence of the non-expanding members 46-1 and 46-2 prevents the expanded fiber from moving to the boundary side between the existing tube 100 and the attachment tube 102, so that the expanded fiber moves to another place. And the water stop function can be maintained over a long period of time. In the present embodiment, another non-inflatable member may be provided in the same manner as the embodiment shown in FIG. For example, a non-expandable member may be further provided on the opposite side of the non-expandable member 46-2 with the water expansion member 44-3 for water stop as a reference.

  In addition, this invention is not limited to the structure of said each embodiment, A various deformation | transformation is possible within the range of the summary of invention.

10, 40 Tube covering body 12, 42 Cylindrical body 14-1, 14-2, 44-1-3 Water expansion member 16, 36-1, 36-2, 46-1, 46-2 for non-expanding water Non-expandable member 60 Repair Device 62 Cylindrical Main Body 64 Side Cover 66 Fluid Supply Pipe 68 Traveling Means

Claims (6)

In a pipe covering body having a cylindrical body made of a curable resin for covering and repairing a repair target portion of an existing pipe from the inner surface,
At least two locations on the outer peripheral surface of the cylindrical body, a water expansion member for water stop for a cylindrical body containing water expansion fibers is continuously provided in the circumferential direction,
A non-expanding member for tubular body having a lower water expandability than the water expansion member for water stopping for tubular body on the outer peripheral surface of the tubular body between the two water stopping members for water stopping for tubular body. Is provided continuously on the outer periphery of the cylindrical body in the circumferential direction. The cylindrical body has a cylindrical portion formed by branching from the cylindrical body,
On the outer peripheral surface of the cylindrical part, a water expansion member for water stop for a cylindrical part including a water expansion fiber is continuously provided in the circumferential direction,
A non-expandable member for a cylindrical part having a lower water expansion property than the water expansion member for a still water for a cylindrical part is provided on the outer side of the cylindrical part on the side of the cylindrical body with respect to the water expansion member for a waterproof part for a cylindrical part The pipe covering body according to claim 1, wherein the pipe covering body is continuously provided in the circumferential direction.   On the opposite side of the tubular body non-expandable member side with respect to the water stop member for water stoppage for the tubular body, a tubular body having a lower water expandability than the water stop member for water stop for the tubular body. The tube covering body according to claim 1 or 2, wherein the non-expandable member is continuously provided on the outer periphery of the cylindrical body in the circumferential direction.   On the opposite side of the tubular portion non-expandable member side with respect to the water stop member for water stop for the tubular portion, the tubular portion having a lower water expandability than the water stop member for water stop for the tubular portion. The tube covering according to claim 3, wherein the non-expandable member is continuously provided on the outer periphery of the cylindrical portion in the circumferential direction. An existing pipe repair method for repairing a repair target part of an existing pipe,
An introducing step of introducing the tube covering body according to any one of claims 1 to 4 in a state where the tubular body is uncured,
A pressing step of pressing the introduced tube covering against the inner surface of the existing tube;
A curing step of curing the tubular body of the tube covering;
Existing pipe repair methods including   An existing pipe repair structure in which the pipe covering body according to any one of claims 1 to 4 is installed inside an existing pipe where a repair target portion has occurred.

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