JP4562038B2 - Repair method of protective pipe with cable installed - Google Patents

Description

  The present invention relates to a cable laying protection pipe repairing method for repairing a protection pipe having a cable laid inside.

As a method of repairing a pipe buried in the ground, a method of repairing by fixing a cylindrical lining material on the inner surface of the buried pipe is known. In this method, a cylindrical lining material formed of a flexible material impregnated or coated with a thermoplastic resin, a photocurable resin, or a room temperature curable resin is disposed inside a pipe, and this cylindrical lining material is used. Inflated with water pressure or air pressure and pressed against the inner surface of the pipe line, and the lining resin is cured and cured by passing hot water, steam, or irradiating ultraviolet rays into the cylindrical lining material. Yes (see, for example, Patent Document 1).
Japanese Patent Publication No. 7-4853

  However, the above-mentioned repair method for buried pipes can be applied if there is no obstruction inside the pipe, but when the cable is laid inside the pipe, the cable cannot be applied because it is in the way. There was a problem. For example, power cables, telephone lines, and other cables have been widely housed and installed in protective pipes buried in the ground. For repair of such protective pipes, It cannot be applied, and if it is to be applied, the cable must be removed from the protective tube, which is very laborious.

  An object of the present invention is to provide a cable laying protection pipe repairing method capable of repairing a protection pipe having a cable laid therein in a state where the cable is laid.

In order to solve the above-mentioned object, the invention according to claim 1 is a cable-installed protective pipe repairing method for repairing a protective pipe in which a cable is laid inside by using a tubular repair material, wherein the tubular The repair material is composed of an elastic base material that is curved in the circumferential direction. The elastic base material is formed by reducing or expanding the diameter of the elastic base material in the bending direction, and the ends of the elastic base material in the bending direction by the restoring force. And a connecting means for connecting the open ends of the tubular repair material formed by joining the ends in the bending direction by the joining means. After the cable is inserted from between both ends of the elastic base material in the bending direction into the inside of the elastic base material, the ends of the elastic base material in the bending direction are connected to each other by a connecting means to repair the tube. Forming a material, and placing the tubular repair material in the protective tube After inserting from one opening, and after putting the cable into the inside of the elastic base material from between the both ends of the bending direction of the elastic base material on the one opening side of the protective tube, The ends of the elastic base material in the bending direction are joined together by a coupling means to form a tubular repair material, and one open end of the tubular repair material is inserted into the protective tube first, and the open end of the tubular repair material The tubular repair material is inserted into the protective tube after being connected by the connecting means, and the previous tubular repair material is moved to the other opening side of the protective tube. The tubular repair material is arranged from one opening to the other opening of the protective tube in a state where the cable is passed through the protective tube.

  The invention according to claim 2 is characterized in that a large number of protrusions are formed on the surface of the elastic base material constituting the tubular repair material according to claim 1.

  According to a third aspect of the present invention, the projection formed on the surface of the elastic base material constituting the tubular repair material according to the second aspect is formed in a circumferential direction and / or an axial direction of the tubular repair material. It is a rib.

  According to a fourth aspect of the present invention, when the ends of the elastic base material constituting the tubular repair material according to any one of the first, second, or third aspects are coupled together by a coupling means, and the elastic base material When connecting one open end of the tubular repair material formed by joining ends in the bending direction to the open end of the tubular repair material previously inserted into the protective tube by the connecting means, the elasticity to be joined A sealing agent is applied to the end of the base material in the bending direction and the open end of the tubular repair material to be connected.

  The invention according to claim 5 is a cable according to claim 1, 2, 3 or 4 in which a protective tube having a cable laid therein is repaired using a flexible tubular repair material in addition to the tubular repair material. An installed protective tube repairing method, wherein the flexible tubular repair material is composed of an elastic base material curved in a circumferential direction, has a flexible structure in an axial direction, and an end portion of the elastic base material in the bending direction Coupling means for joining together to form a flexible tubular repair material; and connection means for connecting open ends of the flexible tubular repair material formed by joining the ends in the bending direction by the joining means. After inserting the cable from between both ends in the bending direction of the elastic base material into the inside of the bending of the elastic base material, the ends in the bending direction of the elastic base material are connected by a coupling means. Combined to form a flexible tubular repair material, one open end of the flexible tubular repair material And connecting to the opening end of the tubular repair material previously inserted into the protective tube by a connecting means, inserting the flexible tubular repair material into the protective tube, and inserting the tubular repair material into the other opening of the protective tube. One open end of the new tubular repair material is connected to the open end of the flexible tubular repair material inserted into the protective tube by connecting means, and the flexible tubular repair material is connected to the other end of the protective tube. The tubular repair material and the flexible tubular repair material are moved from one opening portion of the protective tube to the other opening portion while moving the cable to the opening portion side and sequentially repeating the above steps. And alternately arranged.

According to the protective tube repairing method of claim 1, the elastic base material curved in the circumferential direction is reduced in diameter or expanded in the bending direction, and the ends of the elastic base material in the bending direction are joined by the restoring force. It is a tubular repair material formed by joining ends in the bending direction of the elastic base material by the coupling means, and is configured such that the open end portions of the formed tubular repair material are connected by the connection means. Tubular repair material is used, and after the cable is inserted from between both ends of the elastic base material in the bending direction into the inside of the elastic base material, the ends of the elastic base material in the bending direction are connected by a connecting means. Then, the tubular repair material is formed, and the tubular repair material is inserted into the protective tube from one opening, and thereafter, both ends of the elastic base material in the bending direction on the one opening side of the protective tube. After putting the cable into the curved inside of the elastic base material from between the parts, The ends of the base material in the bending direction are joined together by a joining means to form a tubular repair material, and one open end of the tubular repair material is inserted into the protective tube first, and the open end of the tubular repair material The tubular repair material is inserted into the protective tube after being connected by the connecting means, and the previous tubular repair material is moved to the other opening side of the protective tube. Since the tubular repair material is arranged from one opening of the protective tube to the other opening in a state where the cable is passed through the cable, even if the cable is laid inside the protective tube, the cable is obstructed. It is possible to easily repair the protective tube with the cable installed without a simple operation.

  According to the protective tube repairing method of claim 2, since a large number of protrusions are formed on the surface of the elastic base material constituting the tubular repair material according to claim 1, the inside of the protective tube The contact area between the peripheral surface and the tubular repair material inserted into the protective tube is reduced, and the frictional resistance when the tubular repair material is moved to the other opening side of the protective tube is small. And can be easily moved to the other opening side of the protective tube.

  According to the protective tube repair method of claim 3, the protrusions formed on the surface of the elastic base material constituting the tubular repair material according to claim 2 are arranged in the circumferential direction and / or the axis of the tubular repair material. Since the rib is formed in the direction, the contact area between the inner peripheral surface of the protective tube and the tubular repair material inserted into the protective tube is reduced, and the tubular repair material is moved to the other opening side of the protective tube. Since the frictional resistance at the time is small, the tubular repair material can be inserted into the protective tube and easily moved to the other opening side of the protective tube, and the rib formed on the surface of the elastic base material is the tubular repair material. Therefore, the thickness of the elastic base material can be reduced, and the tubular repair material can be reduced in weight and the material cost can be reduced.

  According to the protective tube repair method according to claim 4, when the ends of the elastic base material constituting the tubular repair material according to claim 1, 2 or 3 are joined together by a joining means, When connecting one open end of the tubular repair material formed by joining the end portions in the bending direction of the elastic base material to the open end of the tubular repair material previously inserted into the protective tube by the connecting means Since the sealing agent is applied to the curved end of the elastic base material to be joined and the opening end of the tubular repair material to be connected, the elastic base material constituting the tubular repair material is connected between the joined ends. And water leakage from between the connected tubular repair materials can be prevented.

  According to the cable laying protection pipe repairing method according to claim 5, a flexible tubular repair material is used in addition to the tubular repair material according to claim 1, 2, 3, or 4. The flexible tubular repair material is composed of an elastic base material curved in the circumferential direction, has a flexible structure in the axial direction, and is made of an elastic base material. Bonding means for joining the ends in the bending direction to form a flexible tubular repair material, and opening ends of the flexible tubular repair material formed by joining the ends in the bending direction by the joining means A connecting means for connecting, and after inserting the cable from between both ends of the elastic base material in the bending direction into the inside of the elastic base material, the end portion of the elastic base material in the bending direction The flexible tubular repair material is formed by joining together by a coupling means, and the flexible tubular repair material One end of the opening is connected to the opening end of the tubular repair material previously inserted into the protective tube by connecting means, and the flexible tubular repair material is inserted into the protective tube to protect the previous tubular repair material. One opening end of the new tubular repair material is connected to the opening end of the flexible tubular repair material that is moved to the other opening side of the tube and inserted into the protective tube, and the flexible tubular repair material Is moved to the other opening side of the protective tube, and the above steps are sequentially repeated, so that the tubular repair material and the flexible tubular repair material can be removed from the one opening portion of the protective tube while the cable is passed through the inside. Since the method is arranged alternately over the other opening, even if a cable is installed inside the protective tube, the cable-installed protective tube can be easily repaired without being obstructed by the cable. Can be tubular repair material into protective tube When the flexible tubular repair material is inserted and moved, even if the protective tube has a curved portion, the flexible tubular repair material placed between the tubular repair materials bends and protects according to the curved portion of the protective tube The tubular repair material and the flexible tubular repair material can be smoothly moved in the pipe, and the tubular repair material and the flexible tubular repair material can be reliably transferred from one opening portion of the protective tube to the other opening portion. Can be arranged.

  Hereinafter, an example of the best mode for carrying out the cable layed protective tube repairing method according to the present invention will be described.

FIGS. 1 to 4 show an example of a tubular repair material used in the method for repairing a protective tube with a cable installed according to the present invention. FIG. 1 is a perspective view of the tubular repair material, and FIG. FIG. 3 is an enlarged sectional view of the elastic base material constituting the tubular repair material shown in FIG. 1, and FIG. 4 is a developed view showing the inner peripheral surface of the elastic base material constituting the tubular repair material shown in FIG. It is.

  The tubular repair material 1 of this example is composed of an elastic base material 2 curved in the circumferential direction. The elastic base material 2 includes a joining means 5 for joining the end portions 3 and 4 in the bending direction to form the tubular repair material 1, and the end portions 3 and 4 in the bending direction are joined by the joining means 5. It has a structure provided with connecting means 6 for connecting the opening end of one formed tubular repair material 1 and the opening end of another tubular repair material 1.

  The elastic base material 2 constituting the tubular repair material 1 is made of plastic, metal or the like. In the elastic base material 2, in this example, the end portions 3, 4 in the bending direction are opened, that is, the elastic base material 2 is formed in a substantially C-shaped cross section (FIG. 3). The tubular repair material 1 is formed by reducing the diameter against the force and connecting the end portions 3 and 4 in the bending direction by the connecting means 5. In the coupling means 5 for coupling the end portions 3 and 4 of the elastic base material 2 in the bending direction, in this example, a locking protrusion formed on the surface side of one end portion 3 along the axial direction. 7 and a locking projection 8 that is formed along the axial direction on the back side of the other end portion 4 and engages with the locking projection 7 in a radial direction so as to engage in the circumferential direction. Then, the end portions 3 and 4 in the bending direction of the elastic base material 2 formed in a substantially C shape are reduced in diameter against the elastic force in the radial direction, and formed in the end portions 3 and 4 in the bending direction. When the locking protrusion 7 and the locking protrusion 8 are locked so as to face each other in the radial direction and engage with each other in the circumferential direction, the locking protrusion 7 and the locking protrusion 7 are locked by the restoring force in the diameter-enlarging direction of the elastic base material 2 having a reduced diameter. The protrusions 8 are firmly engaged with each other, and the end portions 3 and 4 in the bending direction of the elastic base material 2 are combined to form the tubular repair material 1.

  Of course, the coupling means 5 for coupling the end portions 3, 4 of the elastic base material 2 in the bending direction is not limited to the above configuration.

  In addition, an opening end portion of one tubular repair material 1 formed by joining end portions 3 and 4 of the elastic base material 2 in the bending direction with the coupling means 5 and an opening end portion of another tubular repair material 1. Even in the connection means 6 for connecting the two, there is no particular limitation.

  In this example, the connecting means 6 has a small-diameter inner diameter portion 9 formed on one opening end side of the tubular repair material 1 and inserted into the large-diameter inner circumferential portion 9 on the other opening side. An outer peripheral portion 10 is formed, and an inner peripheral surface of the large-diameter inner peripheral portion 9 includes a rectilinear groove 11 extending in the axial direction from the opening end portion and an intersecting groove 12 bending in the circumferential direction from the tip of the rectilinear groove 11. A plurality of key-like locking groove portions 13 are formed at predetermined intervals in the circumferential direction, and the outer peripheral surface of the small-diameter outer peripheral portion 10 has a locking groove portion 13 at a position corresponding to the locking groove portion 13. A locking projection 14 that can be locked is formed (see FIGS. 1 and 4).

  And in connection with the opening edge part of one tubular repair material 1, and the opening edge part of the other tubular repair material 1, it forms in the internal peripheral surface of the large diameter inner peripheral part 9 of one tubular repair material 1 The locking projections 14 formed on the outer peripheral surface of the small-diameter outer peripheral portion 10 of the other tubular repair material 1 are made to coincide with the locking groove portions 13 formed so that the large-diameter inner peripheral portion 9 of one tubular repair material 1 is aligned. When the small-diameter outer peripheral portion 10 of the other tubular repair material 1 is inserted therein, and the locking protrusion 14 that has advanced through the straight groove 11 of the locking groove portion 13 reaches the intersecting groove 12, the other tubular repair material 1 is crossed. By rotating along the groove 12, the locking protrusion 14 enters the intersecting groove 12, and the locking protrusion 14 is locked to the intersecting groove 12, so that one tubular repair material 1 is replaced with another tubular repair material. 1 is secured, and the connection between one tubular repair material 1 and another tubular repair material 1 is completed.

  In the large-diameter inner peripheral portion 9 and the small-diameter outer peripheral portion 10 of the tubular repair material 1 constituting the connecting means 6, the other tubular repair material 1 is placed in the large-diameter inner peripheral portion 9 of one tubular repair material 1. When the small-diameter outer peripheral portion 10 is inserted, there is some play between the large-diameter inner peripheral portion 9 and the small-diameter outer peripheral portion 10, and there is a locking groove portion 13 and a locking protrusion 14 of the tubular repair material 1. Is a locking groove 13 formed on the inner peripheral surface of the large-diameter inner peripheral portion 9 of one tubular repair material 1 and is formed on the outer peripheral surface of the small-diameter outer peripheral portion 10 of the other tubular repair material 1. When the protrusion 14 is locked, it is preferable that there is some play between the locking groove 13 and the locking protrusion 14.

If it does in this way, the bending in the connection part between the tubular repair materials 1 connected by the connection means 6 will be attained, and when inserting and moving the tubular repair material 1 in the protective tube mentioned later, a curved part will be in a protective tube. even bend in connection sites between the protective tube tubular repair material 1 connected according to the curved portion, it becomes that can allow for smooth movement of the tubular repair material 1 of the protective tube.

  In this example, a large number of protrusions 15 are formed on the surface of the elastic base material 2 constituting the tubular repair material 1. The protrusions 15 are ribs 16 and 17 formed in the circumferential direction and the axial direction of the tubular repair material 1. The circumferential rib 16 and the axial rib 17 are formed so that the axial rib 17 is higher than the circumferential rib 16 (see FIG. 2). In this example, the protrusion 15 is the circumferential rib 16 and the axial rib 17, but may be either the circumferential rib 16 or the axial rib 17.

  FIG. 5 is a plan view of a tubular repair material showing another example of the protrusion 15 formed on the surface of the elastic base material 2. As shown in the figure, the protrusion 15 formed in a substantially hemispherical shape is the elastic base material 2. A large number of protrusions may be provided on the surface at predetermined intervals.

  FIGS. 6 to 8 show other examples of the tubular repair material used in the cable laying protective pipe repair method according to the present invention, FIG. 6 is a perspective view of the tubular repair material of this example, and FIG. FIG. 8 is an enlarged sectional view of the elastic base material constituting the tubular repair material shown in FIG.

  Similar to the tubular repair material shown in FIGS. 1 to 4, the tubular repair material 1 of this example is also composed of an elastic base material 2 curved in the circumferential direction. The elastic base material 2 includes a joining means 5 for joining the end portions 3 and 4 in the bending direction to form the tubular repair material 1, and the end portions 3 and 4 in the bending direction are joined by the joining means 5. It has a structure provided with connecting means 6 for connecting the opening end of one formed tubular repair material 1 and the opening end of another tubular repair material 1.

  The elastic base material 2 constituting the tubular repair material 1 is made of plastic, metal or the like. In the elastic base material 2, in this example, the end portions 3, 4 in the bending direction are closed and overlapped in the vertical direction, that is, in the radial direction (FIG. 8). The tubular repair material 1 is formed by expanding the diameter against the generating force and connecting the end portions 3 and 4 in the bending direction by the connecting means 5. In the coupling means 5 that couples the end portions 3 and 4 of the elastic base material 2 in the bending direction, in this example, the engagement protrusion formed along the axial direction on the end surface of the one end portion 3. 18 and an engaging groove 19 formed in the end surface of the other end portion 4 along the axial direction and engaged with the engaging protrusion 18. Then, the end portions 3 and 4 in the bending direction of the elastic base material 2 overlapping in the radial direction are expanded against the elastic force in the radial direction, and the engagement protrusion formed on the end surface of the end portion 3 in the bending direction. When the strip 18 is engaged with the engagement groove 19 formed on the end face of the end portion 4, the engagement protrusion 18 is brought into the engagement groove 19 by the restoring force in the diameter reducing direction of the elastic base material 2 whose diameter has been expanded. The tubular repair material 1 is formed by firmly engaging and joining the end portions 3 and 4 of the elastic base material 2 in the bending direction.

  Other configurations are the same as the tubular repair material shown in FIGS.

  Next, a cable laid protective tube repair method for repairing a protective tube using the tubular repair material 1 configured as described above is shown in FIG. 9 as a first example of a cable laid protective tube repair method according to the present invention. This will be described with reference to FIG.

  FIG. 9 shows the side of the opening of the protective tube embedded in the ground, into the inside of the elastic base material 2 constituting the tubular repair material 1, between the ends 3 and 4 of the elastic base material 2 in the bending direction. After the cable is inserted, the end portions 3 and 4 in the bending direction of the elastic base material 2 are joined together by the joining means 5 to form the tubular repair material 1, and the tubular repair material 1 is put into the protective tube. FIG. 10 is a longitudinal sectional view showing the process of inserting from the opening of FIG. 10. FIG. 10 shows the other opening of the protective tube by inserting the tubular repair material 1 formed in the same manner as FIG. 9 into the tubular repair material 1 inserted into the protective tube. FIG. 11 is a longitudinal sectional view showing the process of moving to the section side, and FIG. 11 is similar to FIG. 10 in which the tubular repair material 1 is sequentially inserted into the protective tube, and the tubular repair material 1 is opened from one opening of the protective tube to the other. It is a longitudinal cross-sectional view which shows the state arrange | positioned over a part.

  As shown in the figure, a protection tube 22 having a cable 21 laid therein is embedded in the ground 20 in a state of being separated by manholes 23a and 23b that stand vertically at predetermined intervals.

  In repairing such a protective tube 22, as shown in FIG. 9, first, the bending of the elastic base material 2 constituting the tubular repair material 1 in the manhole 23 a in which one opening of the protective tube 22 opens. After the cable 21 is inserted into the inside from between both ends 3 and 4 of the elastic base material 2 in the bending direction, the ends 3 and 4 of the elastic base material 2 in the bending direction are connected by the connecting means 5 to form a tubular shape. The repair material 1 is formed, and the tubular repair material 1 is inserted into the protective tube 22 from one opening.

  When the tubular repair material 1 is formed as described above, it is preferable to apply a sealing agent to the end portions 3 and 4 in the bending direction of the elastic base material 2 to be bonded. By applying a sealing agent to the end portions 3 and 4 in the bending direction of the elastic base material 2, water leakage from between the end portions 3 and 4 in the bending direction of the elastic base material 2 constituting the tubular repair material 1 is prevented. can do.

  Next, the open end of the tubular repair material 1 in which the next tubular repair material 1 in the state where the cable 21 is passed through the inside formed in the same manner as described above is inserted into the protective tube 22 at one open end portion first. After being connected to the portion by the connecting means 7, it is inserted into the protective tube 22 and the tubular repair material 1 is moved to the other opening side of the protective tube 22 (FIG. 10). Even when the opening end portion of the next tubular repair material 1 is connected to the opening end portion of the tubular repair material 1 previously inserted into the protective tube 22 by the connecting means 6, the opening end portion of the tubular repair material 1 to be connected is connected. It is preferable to apply a sealing agent. By applying a sealing agent to the opening end of the previous tubular repair material 1 and the opening end of the next tubular repair material 1, water leakage from between the connected tubular repair materials 1 and 1 can be prevented. it can.

  In order to move the tubular repair material 1 inserted from one opening of the protective tube 22 to the other opening side of the protective tube 22, the tubular repair material 1 is manually moved from the one opening side of the protective tube 22. Or it presses with mechanical means, such as a jack, or pulls the said tubular repair material 1 from the other opening part side of the protective tube 22, It does not specifically limit. Further, in order to facilitate the movement of the tubular repair material 1 in the protective tube 22, a lubricant may be applied to the inner peripheral surface of the protective tube 22 as necessary.

  A large number of protrusions 15 are preferably formed on the surface of the elastic base material 2 constituting the tubular repair material 1. When a large number of protrusions 15 are formed on the surface of the elastic base material 2 constituting the tubular repair material 1, the contact area between the inner peripheral surface of the protective tube 22 and the tubular repair material 1 inserted into the protective tube 22 is large. Since the friction resistance when the tubular repair material 1 is moved to the other opening side of the protective tube 22 is small, the tubular repair material 1 is inserted into the protective tube 22 and the other opening side of the protective tube 22 is inserted. It can be easily moved to.

  In this example, since the protrusion 15 is formed as ribs 16 and 17 formed in the circumferential direction and the axial direction of the tubular repair material 1, the ribs 16 and 17 provide strength in the circumferential and axial directions of the tubular repair material 1. Since the axial rib 18 is higher than the circumferential rib 16, the tubular repair material 1 is moved to the other opening side of the protective tube 22. The frictional resistance is small, and the tubular repair material 1 can be inserted into the protective tube 22 and easily moved to the other opening side of the protective tube 22.

  By sequentially repeating the above steps, the tubular repair material 1 is opened from one opening of the protective tube 22 that opens into the manhole 23a while the cable 21 is passed through the other to the other manhole 23b. Arrange over the opening. And the tubular repair material 1 arrange | positioned in the protective tube 22 is fixed to the protective tube 22 with the appropriate fixing means 24. FIG. As the fixing means 24, for example, an epoxy resin or mortar is injected and fixed between the protective tube 22 and the tubular repair material 1. In this way, the repair of the protective tube 22 in which the cable 21 is laid is completed (FIG. 11).

  By doing in this way, repair of the protective tube 22 in which the cable 21 is laid inside can be repaired without being obstructed by the cable 21 while the cable 21 is still laid. It can be done easily with simple operations.

  In the above-mentioned protective pipe repairing method for cable laying, the tubular repair material 1 inserted into the protective pipe 22 is moved or pressed by manual means or mechanical means such as a jack. In order to further facilitate the movement of the tubular repair material 1 in 22, a tubular guide body having a conical tip portion may be used.

  12 and 13 show an example of a tubular guide body, FIG. 12 is a perspective view of the tubular guide body, and FIG. 13 is an enlarged cross-sectional view of an elastic base material constituting the tubular guide body shown in FIG. .

  The tubular guide body 25 of this example has a shape having a conical portion 25b whose diameter decreases toward the distal end at the distal end portion of the main body portion 25a having the same diameter as the tubular repair material 1, and is curved in the circumferential direction. The elastic base material 26 is used. The elastic base material 26 includes a coupling means 29 that joins the end portions 27 and 28 in the bending direction to form the tubular guide body 25, and the end portions 27 and 28 in the bending direction are joined together by the joining means 29. The formed tubular guide body 25 has a structure including a connection means 30 for connecting the rear opening end of the tubular guide body 25 and the opening end of the tubular repair material 1.

  The elastic base material 26 constituting the tubular guide body 25 is made of plastic, metal or the like. In the elastic base material 26, in this example, the end portions 27 and 28 in the bending direction are opened, that is, the elastic base material 26 is formed in a substantially C-shaped cross section (FIG. 13). The tubular guide body 25 is formed by reducing the diameter against the force and connecting the end portions 27 and 28 in the bending direction by the connecting means 29.

  In the coupling means 29 that couples the end portions 27 and 28 in the bending direction of the elastic base material 26, in this example, a locking protrusion formed along the axial direction on the surface side of one end portion 27. 31 and a locking projection 32 which is formed along the axial direction on the back surface side of the other end portion 28 and engages with the locking projection 31 in a radial direction so as to engage in the circumferential direction.

  Then, the end portions 27 and 28 in the bending direction of the elastic base material 26 formed in a substantially C shape are reduced in diameter against the elastic force in the radial direction, and formed in the end portions 27 and 28 in the bending direction. When the locking protrusion 31 and the locking protrusion 32 are locked so as to face each other in the radial direction and engage with each other in the circumferential direction, the locking protrusion 31 and the locking protrusion 31 are locked by the restoring force in the diameter-enlarging direction of the elastic base material 26 having a reduced diameter. The projections 32 are firmly engaged with each other, and the end portions 27 and 28 in the bending direction of the elastic base material 26 are coupled to form the tubular guide body 25. Of course, the coupling means 29 for coupling the end portions 27 and 28 in the bending direction of the elastic base material 26 is not limited to the above configuration.

  Also, the rear opening end of the tubular guide body 25 formed by joining the end portions 27 and 28 in the bending direction of the elastic base material 26 by the connecting means 29 and the opening end of the tubular repair material 1 are connected. In the connecting means 30 to be configured, the connecting means 6 included in the tubular repair material 1 is constituted by a locking groove portion 33 that locks the locking protrusion 14 formed on the outer peripheral surface of the small-diameter outer peripheral portion 10. Has been.

  That is, a large-diameter inner peripheral portion 34 having the same diameter as the large-diameter inner peripheral portion 9 of the tubular repair material 1 is formed on the rear opening end side of the tubular guide portion 25, and the inner peripheral surface of the large-diameter inner peripheral portion 34 The key is composed of a rectilinear groove 35 and a cross groove 36 having the same configuration as the key-shaped locking groove portion 13 composed of the rectilinear groove 11 and the cross groove 12 formed in the large-diameter inner peripheral portion 9 of the tubular repair material 1. The said locking groove part 33 of shape is provided.

  Further, a string passage hole 37 is provided in the conical part 25b at the distal end of the main body part 25a of the tubular guide body 25 so that a tow string 38 can be connected (FIGS. 12 and 13). ).

  The tubular guide body 25 is used as follows. First, in the manhole 23a in which one opening of the protective tube 22 opens, into the inside of the elastic base material 26 constituting the tubular guide body 25, from between both ends 27 and 28 in the bending direction of the elastic base material 26. After inserting the cable 21, the end portions 27 and 28 in the bending direction of the elastic base material 26 are joined together by the joining means 29 to form the tubular guide body 25.

  Next, the cable 21 is inserted from both ends 3 and 4 in the bending direction of the elastic base material 2 into the bending inside of the elastic base material 2 constituting the tubular repair material 1, and then the bending direction of the elastic base material 2 The tubular repair material 1 is formed by joining the end portions 3 and 4 of the tubular repair material 1 with the joining means 5, and the opening end portion on the small diameter outer peripheral portion 10 side of the tubular repair material 1 and the rear opening end portion of the tubular guide body 25. In this state, the tubular repair material 1 is inserted into the protective tube 22 from one opening.

  Thereafter, the tubular repair material 1 in which the next tubular repair material 1 in a state where the cable 21 is sequentially passed through the inside in accordance with the steps shown in the first example is inserted into the protective tube 22 with one opening end portion thereof being inserted first. 1 is connected to the opening end portion of the protective tube 22 and inserted into the protective tube 22 to move the tubular repair material 1 to the other opening side of the protective tube 22, and the cable 21 is passed through the inside. In this state, the tubular repair material 1 is arranged from one opening portion of the protective tube 22 opening into the manhole 23a to the other opening portion opening into the manhole 23b.

In this way, when the tubular repair material 1 is inserted into the protective tube 22 from one opening with the tubular guide body 25 at the top, even if there is a curved portion in the protective tube 22 , the distal end portion of the tubular guide body 25 Since the conical portion 25b in the guide guides the tubular repair material 1 connected to the tubular guide body 25 in a bending direction according to the curved portion of the protection tube 22, the movement of the tubular repair material 1 in the protection tube 22 is further facilitated. It becomes something that can be made.

  When the tubular repair material 1 inserted into the protective tube 22 is pulled and moved from the other opening side of the protective tube 22, as shown in FIG. 14, the string provided on the conical portion 25 b of the tubular guide body 25. A tow string 38 is connected to the through hole 37, and the tow string 38 can be pulled and moved from the other opening side of the protective tube 22 as shown in FIG.

  FIG. 16 to FIG. 18 show an example of a flexible tubular repair material used in combination with the tubular repair material in the cable laying protective tube repair method according to the present invention, and FIG. 16 shows a flexible tubular repair material. FIG. 17 is an enlarged sectional view taken along the line CC of FIG. 16, and FIG. 18 is an enlarged sectional view of an elastic base material constituting the flexible tubular repair material shown in FIG.

  The flexible tubular repair material 39 of this example is composed of an elastic base material 40 that is curved in the circumferential direction. The elastic substrate 40 has a flexible structure in the axial direction. As a flexible structure, in this example, the elastic base material 40 is formed with grooves and ridges extending in the circumferential direction alternately in the axial direction, and the end portions 41 and 42 in the bending direction of the elastic base material 40 are connected to each other. When joined, a bellows portion 43 is formed, and the bellows portion 43 is structured to have flexibility in the axial direction.

  Further, the elastic base material 40 includes a coupling means 44 for joining the end portions 41, 42 in the bending direction to form a flexible tubular repair material 39, and the end portions 41, 42 in the bending direction by the joining means 44. It has the structure provided with the connection means 45 which connects the opening edge part of the flexible tubular repair material 39 formed by combining and the opening edge part of the said tubular repair material 1. As shown in FIG.

  The elastic base material 40 constituting the flexible tubular repair material 39 is made of plastic, metal or the like. In the elastic base material 40, in this example, the end portions 41 and 42 in the bending direction are opened, that is, formed in a substantially C-shaped cross section (FIG. 18), and the elastic force in the radial direction. The flexible tubular repair material 39 is formed by connecting the end portions 41, 42 in the bending direction with the connecting means 44. In the coupling means 44 for coupling the end portions 41, 42 in the bending direction of the elastic base material 40, in this example, a locking projection formed on the surface side of one end portion 41 along the axial direction. 46 and a locking projection 47 formed along the axial direction on the back surface side of the other end portion 42 and engaged with the locking projection 46 so as to engage with the locking projection 46 in the radial direction and engage with each other in the circumferential direction. Then, the end portions 41 and 42 in the bending direction of the elastic base material 40 formed in a substantially C shape are reduced in diameter against the elastic force in the radial direction, and formed in the end portions 41 and 42 in the bending direction. When the locking projection 46 and the locking projection 47 are locked so as to face each other in the radial direction and engage with each other in the circumferential direction, the locking projection 46 and the locking projection 46 are locked by the restoring force in the diameter-enlarging direction of the elastic base material 40 having a reduced diameter. The protrusions 47 are firmly engaged with each other, and the end portions 41 and 42 in the bending direction of the elastic base material 40 are combined to form a flexible tubular repair material 39.

  Also, the opening end of the flexible tubular repair material 39 formed by joining the end portions 41 and 42 in the bending direction of the elastic base material 40 by the coupling means 44 and the opening end of the tubular repair material 1 are connected. The connecting means 45 to be configured has the same configuration as the connecting means 6 provided in the tubular repair material 1, and the open end of the flexible tubular repair material 39 and the open end of the tubular repair material 1 can be connected. It is like that.

  That is, the connecting means 45 of this example also has a large-diameter inner peripheral portion 48 having the same diameter as the large-diameter inner peripheral portion 9 of the tubular repair material 1 on the one opening end side of the flexible tubular repair material 39. A small-diameter outer peripheral portion 49 that can be inserted into the large-diameter inner peripheral portion 9 of the tubular repair material 1 is formed on the other opening side, and on the inner peripheral surface of the large-diameter inner peripheral portion 48, the tubular repair material 1 A key-like locking groove portion 52 formed of a rectilinear groove 50 and a crossing groove 51 having the same configuration as the key-like locking groove portion 13 formed of the rectilinear groove 11 and the crossing groove 12 formed in the large-diameter inner peripheral portion 9 is formed. In addition, a locking projection 53 that can be locked to the locking groove 13 of the tubular repair material 1 is formed on the outer peripheral surface of the small-diameter outer peripheral portion 49 (see FIG. 16).

  Next, a protection pipe repairing method with a cable installed in which the protection pipe is repaired by using the flexible tubular repair material 39 configured as described above in combination with the tubular repair material 1 used in the first example is provided in the present invention. A second example of the cable laying protection pipe repairing method will be described with reference to FIGS.

  FIG. 19 shows the bending of the elastic base material 40 into the inside of the bending of the elastic base material 40 constituting the flexible tubular repairing material 39 after inserting the tubular repairing material 1 with the cable into the protective tube buried in the ground. After inserting the cable from both ends 41 and 42 in the direction, the end portions 41 and 42 in the bending direction of the elastic base material 40 are joined together by the joining means 44 to form a flexible tubular repair material 39, FIG. 20 is a longitudinal sectional view showing a process of inserting the flexible tubular repair material 39 into the protective tube. FIG. 20 shows the tubular repair material 1 inserted into the protective tube, and the protective tube 39 is inserted by inserting the flexible tubular repair material 39 formed in FIG. FIG. 21 is a longitudinal sectional view showing a process of moving to the other opening side of FIG. 21. FIG. 21 shows the tubular repair material 1 and the flexible tubular repair by alternately inserting the tubular repair material 1 and the flexible tubular repair material 39 into the protective tube. The material 39 is arranged from one opening of the protective tube to the other opening. It is a longitudinal sectional view showing a state.

  As shown in the figure, a protection tube 22 having a cable 21 laid therein is embedded in the ground 20 in a state of being separated by manholes 23a and 23b that stand vertically at predetermined intervals.

  In repairing such a protective tube 22, first, in the manhole 23a in which one opening of the protective tube 22 opens, the elastic base material constituting the tubular repair material 1 is exactly the same as in the first example. 2, the cable 21 is inserted from both ends 3 and 4 of the elastic base material 2 in the bending direction, and then the ends 3 and 4 of the elastic base material 2 in the bending direction are connected to each other by the connecting means 5. Then, the tubular repair material 1 is formed, and the tubular repair material 1 is inserted into the protective tube 22 from one opening.

  Next, the cable 21 is inserted into the inside of the elastic base material 40 constituting the flexible tubular repair material 39 from between both ends 41 and 42 in the bending direction of the elastic base material 40, and then the elastic base material 40. The end portions 41 and 42 in the curved direction are joined together by a joining means 44 to form a flexible tubular repair material 39, and the flexible tubular repair material 39 is placed in the protective tube 22 with one open end thereof first. After being connected to the opening end of the tubular repair material 1 inserted by the connecting means 45, it is inserted into the protective tube 22 (FIG. 19). And the said tubular repair material 1 is moved to the other opening part side of the protection tube 22 by the flexible tubular repair material 39 inserted in the protection tube 22 (FIG. 20).

  Next, one open end of the new tubular repair material 1 formed in the same manner as described above is connected to the open end of the flexible tubular repair material 39 inserted into the protective tube 22 by the connecting means 6. By pressing and moving the flexible tubular repair material 39 toward the other opening side of the protective tube 22 and repeating this process in sequence, the tubular repair material 1 and the flexible tubular repair are carried out with the cable 21 being passed through the inside. The materials 39 are alternately arranged from one opening of the protective tube 22 to the other opening.

  The tubular repair material 1 and the flexible tubular repair material 39 arranged alternately in the protective tube 22 are alternately arranged one by one in this example. For example, two tubular repair materials 1 are flexible. You may arrange | position alternately with the state where the tubular repair material 39 is one piece.

  The tubular repair material 1 arranged in the protective tube 22 as described above is fixed to the protective tube 22 by appropriate fixing means 24. As the fixing means 24, for example, an epoxy resin or mortar is injected and fixed between the protective tube 22 and the tubular repair material 1 and the flexible tubular repair material 39. In this way, the repair of the protective tube 22 in which the cable 21 is laid is completed (FIG. 21).

  When forming the flexible tubular repair material 39, if a sealing agent is applied to both ends 41, 42 in the bending direction of the elastic base material 40 to be joined, the elastic base material 40 constituting the flexible tubular repair material 39 is formed. Water leakage from between both end portions 41 and 42 in the bending direction can be prevented, and also when the opening end portion of the tubular repair material 1 and the opening end portion of the flexible tubular repair material 39 are connected to each other, it is tubular. When a sealing agent is applied to the opening end of the repair material 1 and the opening end of the flexible tubular repair material 39, water leakage from between the connected tubular repair material 1 and the flexible tubular repair material 39 can be prevented. it can.

  Further, in order to move the tubular repair material 1 and the flexible tubular repair material 39 inserted from one opening of the protective tube 22 to the other opening side of the protective tube 22, as in the first example, The tubular repair material 1 and the flexible tubular repair material 39 are pressed from one opening side of the protective tube 22 by mechanical means such as human power or a jack, or the tubular repair material from the other opening side of the protective tube 22. 1 and the flexible tubular repair material 39 are pulled, but not particularly limited. Further, in order to facilitate the movement of the tubular repair material 1 and the flexible tubular repair material 39 in the protective tube 22, a lubricant may be applied to the inner peripheral surface of the protective tube 22 as necessary.

  By doing in this way, repair of the protective tube 22 in which the cable 21 is laid inside can be repaired without being obstructed by the cable 21 while the cable 21 is still laid. Even if there is a curved portion in the protective tube 22 when the tubular repair material 1 and the flexible tubular repair material 39 are inserted and moved into the protective tube 22, the tubular repair can be performed easily. The flexible tubular repair material 39 disposed between the materials 1 bends according to the curved portion of the protective tube 22, and allows the tubular repair material 1 and the flexible tubular repair material 39 to move smoothly in the protective tube 22. The tubular repair material 1 and the flexible tubular repair material 39 can be reliably arranged from one opening of the protective tube 22 to the other opening.

  In the above-described protective pipe repairing method for cable laying, the tubular repair material 1 and the flexible tubular repair material 39 inserted into the protection tube 22 are pressed by mechanical means such as human power or a jack, or the tubular repair material 1 can be used. The tubular repair material 1 and the flexible tubular repair material 39 are pulled from the other opening side of the protective tube 22 into which the flexible tubular repair material 39 is inserted to move in the protection tube 22. In order to further facilitate the movement of the flexible tubular repair material 39, it is preferable to use a tubular guide body having a conical tip as in the first example. Also in this example, the tubular guide body 25 shown in FIGS. 12 and 13 is used as in the first example.

  In this example, the tubular guide body 25 is used as follows. First, as in the first example, in the manhole 23a in which one opening of the protective tube 22 opens, the elastic base 26 is bent in the bending direction of the elastic base 26 constituting the tubular guide body 25. After the cable 21 is inserted from between both end portions 27 and 28, the end portions 27 and 28 in the bending direction of the elastic base material 26 are coupled by a coupling means 29 to form the tubular guide body 25.

  Next, the cable 21 is inserted from both ends 3 and 4 in the bending direction of the elastic base material 2 into the bending inside of the elastic base material 2 constituting the tubular repair material 1, and then the bending direction of the elastic base material 2 The tubular repair material 1 is formed by joining the end portions 3 and 4 of the tubular repair material 1 with the joining means 5, and the opening end portion on the small diameter outer peripheral portion 10 side of the tubular repair material 1 and the rear opening end portion of the tubular guide body 25. In this state, the tubular repair material 1 is inserted into the protective tube 22 from one opening.

  Next, the cable 21 is inserted into the inside of the elastic base material 40 constituting the flexible tubular repair material 39 from between both ends 41 and 42 in the bending direction of the elastic base material 40, and then the elastic base material 40. The end portions 41 and 42 in the curved direction are joined together by a joining means 44 to form a flexible tubular repair material 39, and the flexible tubular repair material 39 is placed in the protective tube 22 with one open end thereof first. After being connected to the open end of the tubular repair material 1 inserted by the connecting means 45, it is inserted into the protective tube 22.

  Thereafter, the tubular repair material 1 and the flexible tubular repair material 39 are alternately inserted into the protective tube 22 after the cable 21 is sequentially passed through the inside in accordance with the steps shown in the second example, and The tubular repair material 1 and the flexible tubular repair material 39 are moved to the other opening side of the protective tube 22 and the tubular repair material 1 and the flexible tubular repair material 39 are placed in the manhole 23a while the cable 21 is passed through the inside. It arrange | positions ranging from the other opening part opened in the next manhole 23b from the one opening part of the protection tube 22 opened to the next.

Thus, when the tubular repair material 1 and the flexible tubular repair material 39 are inserted into the protective tube 22 from one opening with the tubular guide body 25 at the top, even if there is a curved portion in the protective tube 22, Since the conical portion 25b at the distal end of the tubular guide body 25 guides the tubular repair material 1 connected to the tubular guide body 25 in a bending direction according to the curved portion of the protective tube 22, the tubular repair in the protective tube 22 is performed. The movement of the material 1 and the flexible tubular repair material 39 can be further facilitated.

  When the tubular repair material 1 and the flexible tubular repair material 39 inserted into the protective tube 22 are pulled and moved from the other opening side of the protective tube 22, as shown in FIG. The tow string 38 is connected to the string through hole 37 provided in the portion 25b, and the tow string 38 can be pulled and moved from the other opening side of the protective tube 22 as shown in FIG.

The perspective view which shows an example of the tubular repair material used with the cable laying protection pipe repair method which concerns on this invention. The AA line expanded sectional view of FIG. The expanded sectional view of the elastic base material which comprises the tubular repair material shown in FIG. The expanded view which shows the internal peripheral surface of the elastic base material which comprises the tubular repair material shown in FIG. The top view of the tubular repair material which shows the other example of the processus | protrusion formed in the surface. The perspective view which shows the other example of the tubular repair material used with the cable laying protection pipe repair method which concerns on this invention. The BB line expanded sectional view of FIG. The expanded sectional view of the elastic base material which comprises the tubular repair material shown in FIG. In the first example of the cable laying protection pipe repairing method according to the present invention, the elastic base is formed into the curved inside of the elastic base material constituting the tubular repair material on one opening side of the protection pipe buried in the ground. After inserting the cable from between both ends in the bending direction of the material, the ends in the bending direction of the elastic base material are joined together by a coupling means to form a tubular repair material, and the tubular repair material is put into the protective tube The longitudinal cross-sectional view which shows the process inserted from one opening part. The longitudinal cross-sectional view which shows the process of pressing and moving the tubular repair material inserted in the protective tube to the other opening part side of a protective tube by insertion of the next tubular repair material formed similarly to FIG. The longitudinal cross-sectional view which shows the state which inserted the tubular repair material into the protective tube sequentially like FIG. 10, and has arrange | positioned the tubular repair material over the other opening part of the protective tube. The perspective view which shows an example of the tubular guide body used with the cable laying protection pipe repair method which concerns on this invention. The expanded sectional view of the elastic base material which comprises the tubular guide body shown in FIG. The perspective view which shows the state which connected the pulling string to the tubular guide body. In the first example of the cable laying protection tube repairing method according to the present invention, the tubular guide member is used, and the tubular repair material is moved by pulling the traction string from the other opening side of the protection tube into which the tubular repair material is inserted. Explanatory drawing which shows the state made to do. The perspective view which shows an example of the flexible tubular repair material used in addition to a tubular repair material with the cable laying protection pipe repair method which concerns on this invention. FIG. 17 is an enlarged sectional view taken along line CC in FIG. 16. The expanded sectional view of the elastic base material which comprises the flexible tubular repair material shown in FIG. The elastic base material which comprises a flexible tubular repair material after inserting the tubular repair material which put the cable in the protective tube currently embed | buried in the ground in the 2nd example of the protective tube repaired cable installation method which concerns on this invention After inserting the cable from between both ends in the bending direction of the elastic base material into the inside of the bending, the ends of the elastic base material in the bending direction are connected by a connecting means to form a flexible tubular repair material, The longitudinal cross-sectional view which shows the process of inserting this flexible tubular repair material in the said protective tube. The longitudinal cross-sectional view which shows the process of pressing and moving the tubular repair material inserted in the protection tube to the other opening part side of a protection tube by insertion of the flexible tubular repair material formed in FIG. A state in which the tubular repair material and the flexible tubular repair material are alternately inserted into the protective tube in sequence, and the tubular repair material and the flexible tubular repair material are arranged from one opening to the other opening of the protective tube. FIG. In the second example of the cable laying protection tube repairing method according to the present invention, the pulling string is pulled from the other opening side of the protection tube using the tubular guide body and inserting the tubular repair material and the flexible tubular repair material. Explanatory drawing which shows the state which moves a tubular repair material and a flexible tubular repair material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular repair material 2 Elastic base material 3 End part 4 End part 5 Coupling means 6 Connection means 7 Locking protrusion 8 Locking protrusion 9 Large diameter inner peripheral part 10 Small diameter outer peripheral part 11 Straight groove 12 Crossing groove 13 Locking groove part 14 Engagement Stop projection 15 Projection 16 Rib 17 Rib 18 Engagement ridge 19 Engagement groove 20 Ground 21 Cable 22 Protective tube 23a, 23b Manhole 24 Fixing means 25 Tubular guide body 25a Main body portion 25b Conical portion 26 Elastic base material 27 End portion 28 End portion 29 Coupling means 30 Connection means 31 Locking protrusion 32 Locking protrusion 33 Locking groove part 34 Large diameter inner peripheral part 35 Straight advance groove 36 Cross groove 37 String through hole 38 Pulling string 39 Flexible tubular repair material 40 Elastic base material 41 End portion 42 End portion 43 Bellows portion 44 Coupling means 45 Connection means 46 Locking protrusion 47 Locking protrusion 48 Large diameter inner peripheral part 49 Small diameter outer peripheral part 50 Straight groove 51 Crossing groove 52 Locking groove part 53 Locking protrusion part

Claims (5)

A cable installed protective tube repairing method for repairing a protective tube in which a cable is installed inside using a tubular repair material,
The tubular repair material is composed of an elastic base material that is curved in the circumferential direction. The elastic base material is formed by reducing or expanding the diameter of the elastic base material in the bending direction, and the restoring force of the elastic base material in the bending direction of the elastic base material. Coupling means for joining the parts to form a tubular repair material, and connecting means for connecting the open ends of the tubular repair material formed by joining the ends in the bending direction by the joining means It has a structure
After inserting the cable from between the both ends of the elastic base material in the bending direction into the inside of the elastic base material, the ends of the elastic base material in the bending direction are connected by a connecting means to form a tubular repair material. The tubular repair material is inserted into the protective tube from one opening,
After that, after the cable is put into the inside of the elastic base material from between both ends of the elastic base material in the bending direction on the one opening side of the protective tube, the end of the elastic base material in the bending direction After connecting the parts with a connecting means to form a tubular repair material, after connecting one open end of the tubular repair material to the open end of the tubular repair material previously inserted into the protective tube by the connecting means Inserting the tubular repair material into the protective tube and moving the tubular repair material to the other opening side of the protective tube;
A cable laid protective tube characterized in that the tubular repair material is arranged from one opening to the other opening of the protective tube in a state where the cable is passed through by repeating the steps in order. Repair method.   The cable laid protective tube repair method according to claim 1, wherein a plurality of protrusions are formed on a surface of the elastic base material constituting the tubular repair material.   The cable laying according to claim 2, wherein the protrusion formed on the surface of the elastic base material constituting the tubular repair material is a rib formed in a circumferential direction and / or an axial direction of the tubular repair material. Protected pipe repair method.   One open end of the tubular repair material formed by joining the ends in the bending direction of the elastic base material constituting the tubular repair material by the joining means, and joining the ends in the bending direction of the elastic base material When connecting the connecting portion to the opening end portion of the tubular repair material previously inserted into the protective tube by the connecting means, sealing is performed on the end portion of the elastic base material to be joined and the opening end portion of the connecting tubular repair material. 4. The method for repairing a protective tube after laying a cable according to claim 1, wherein an agent is applied. The cable laid protective tube repair method according to claim 1, 2, 3, or 4, wherein a protective tube having a cable laid therein is repaired by using a flexible tubular repair material together with the tubular repair material. ,
The flexible tubular repair material is composed of an elastic base material curved in the circumferential direction, has a flexible structure in the axial direction, and joins ends of the elastic base material in the bending direction to form a flexible tubular repair material. And a connecting means for connecting the open ends of the flexible tubular repair material formed by joining the ends in the bending direction by the joining means.
After inserting the cable from between both ends of the elastic base material in the bending direction into the inside of the elastic base material, the ends of the elastic base material in the bending direction are joined together by a coupling means to form a flexible tubular repair material. Forming,
One open end of the flexible tubular repair material is connected to the open end of the tubular repair material previously inserted into the protective tube by connecting means, and the flexible tubular repair material is inserted into the protective tube to Move the previous tubular repair material to the other opening side of the protective tube,
One open end of the new tubular repair material is connected to the open end of the flexible tubular repair material inserted into the protective tube by connecting means, and the flexible tubular repair material is moved to the other open side of the protective tube. Let
By sequentially repeating the above steps, the tubular repair material and the flexible tubular repair material are alternately arranged from one opening portion of the protective tube to the other opening portion while the cable is passed through the inside. A protective method for repairing pre-installed protective tubes.

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