Protective tube with wiring fixing function and method for forming same

Abstract

[Problem] To provide a protective tube with a wiring fixing function for preventing wiring from being pulled out, and a method for forming the same. [Solution] Provided is a protective tube (10A) with a wiring fixing function formed in at least a partial section of a protective tube (5) having a conduit into which wiring (4) for connecting equipment within a facility is inserted, a curable material (12) being filled and cured in the conduit within the section in a state of surrounding the wiring, the wiring (4) being fixed to the protective tube within the section via the cured material (12). Such a protective tube (10A) is formed by a method including: a step of forming a lid (14) or a portion corresponding thereto that blocks the conduit of the protective tube at at least one point, using a low-permeability material that does not allow an uncured curable material to permeate therethrough; and a step of injecting the uncured curable material into the conduit, the at least one point of which is blocked by the lid (14) or the portion corresponding thereto, in a state in which the wiring (4) is being inserted through the conduit of the protective tube.

Description

Protective tube with wiring fixing function and method for forming same

[0001] The present invention relates to a protective tube with a wiring fixing function and a method for forming the same.

[0002] Generally, a solar power generation facility includes a plurality of solar panels and a collector box that collects electricity generated by the solar panels, and the solar panels and the collector box are connected via conductive wiring (electric wires or cables). The conductive wiring is inserted into a protective pipe buried underground within the facility, one end of the protective pipe is led out above ground and one end of the wiring is connected to the solar panel, and the other end of the protective pipe is also led out above ground and the other end of the wiring is connected to the collector box.

[0003] One example of a protective pipe, such as the one described above, through which wiring is inserted and buried underground, is the technology disclosed in Patent Document 1 below. In such solar power generation facilities, the theft of wiring containing copper conductors has become common due to the recent rise in copper prices. Theft of wiring not only results in the loss of the wiring itself, but also requires significant costs for equipment repair. Furthermore, even if theft does not occur, solar power generation facility managers are forced to invest in equipment to prevent theft, such as installing surveillance cameras. Thus, the fact that solar power generation facility managers are suffering significant direct and indirect economic losses has become a problem.

[0004] Japanese Patent Application Laid-Open No. 2000-240082

[0005] Incidentally, theft of wiring can be carried out by cutting the wiring at the point where the wiring is led above ground and connected to the solar panel or current collection box, and at the handhole (manhole) provided in the middle of the protective pipe for wiring inspection, and then pulling out the wiring above ground. However, the technology disclosed in the above-mentioned Patent Document 1 does not have a structure to prevent the wiring from being pulled out.

[0006] Therefore, there has been a demand for a means for preventing the theft of wires by preventing the above-mentioned wire pulling out, thereby delaying the wire theft operation and causing the would-be wire thief to abandon the theft attempt. In view of the above problem, the present invention has an object to provide a protective tube with a wire fixing function that prevents the wire from being pulled out, and a method for forming the same.

[0007] In order to solve the above-mentioned problems, the present invention provides a protective tube with a wiring fixing function, which has a conduit and protects wiring that passes through the conduit, and in which wiring connecting equipment within a facility is formed in at least a section of the protective tube that passes through the conduit, and the conduit within the section is filled with and hardened with a hardening material that surrounds the wiring, and the wiring is fixed to the protective tube within the section via the hardening material.

[0008] Furthermore, in order to solve the above-mentioned problems, the present invention provides a method for forming a protective tube with a wiring fixing function, which includes the steps of: forming a lid or an equivalent part that blocks the conduit of the protective tube at at least one point using a low-permeability material that does not allow the hardening material to pass through before hardening; and injecting the hardening material before hardening into the inside of the conduit that has been blocked at at least one point by the lid or an equivalent part while the wiring is being inserted through the conduit of the protective tube.

[0009] According to the present invention, it is possible to delay the theft of wiring and to prevent the theft of wiring.

[0010] FIG. 1 is a schematic diagram showing a photovoltaic power generation facility as an example of a facility in which some embodiments of the protective pipe with a wiring fixing function according to the present invention are employed. FIG. 2 is a diagram showing a cross section of an embodiment of the protective pipe with a wiring fixing function according to the present invention when cut along a longitudinal axis. FIG. 3 is a diagram showing a cross section of the embodiment of the protective pipe with a wiring fixing function shown in FIG. 2 when cut along a radial direction. FIG. 4 is a diagram showing an outline of a method for forming an embodiment of the protective pipe with a wiring fixing function according to the present invention, continuing from FIG. 4. FIG. 5 is a diagram showing an example of an end cap made of a low-permeability material used in the process of forming an embodiment of the protective pipe with a wiring fixing function according to the present invention. FIG. 6 is a diagram showing another example of an end cap made of a low-permeability material used in the process of forming an embodiment of the protective pipe with a wiring fixing function according to the present invention. FIG. 7 is a diagram showing a cross section of an embodiment of a partial protective pipe that is a part of a protective pipe that is buried in the ground and protects wiring when cut along a longitudinal axis.

[0011] Next, an embodiment of a protective pipe with a wiring fixing function according to the present invention will be described in detail with reference to the accompanying drawings. Referring to Fig. 1, an embodiment of a protective pipe with a wiring fixing function according to the present invention is employed as a part of a protective pipe 5 buried underground 100 in a photovoltaic power generation facility 1 or the like.

[0012] A solar power generation facility 1, cited as an example of a facility in which a protective pipe 10 with wiring fixing function is used, comprises a plurality of solar panels 2 and a collector box 3 that collects electricity generated by the solar panels 2, and conductive wiring 4 connecting the solar panels 2 and the collector box 3 is inserted into a protective pipe 5 buried underground 100 within the facility 1, one end of the protective pipe 5 is led out to the ground and one end of the wiring 4 is connected to the solar panel 2, and the other end of the protective pipe 5 is also led out to the ground and the other end of the wiring 4 is connected to the collector box 3.

[0013] Furthermore, a handhole 6 for inspecting the wiring 4 is provided in the middle of the protective pipe 5. In the example facility shown in Figure 1, two handholes 6A and 6B are clearly shown. Note that reference numerals 6a and 6b are covers for the handholes 6A and 6B, respectively. Of course, the number of handholes 6 provided in the solar power generation facility 1 is optional.

[0014] In this application, "wiring" refers to an electric wire or a cable. Here, an "electric wire" refers to an insulated core wire having a conductor and an insulating coating formed around the conductor, and a "cable" refers to a wire having at least one insulated core wire made of a conductor and an insulating coating formed around the conductor, and further having a sheath formed around the insulating coating. Each of the conductors is made of, for example, copper. Examples of the wiring 4 in this embodiment include solar cables and other wiring used for wiring solar panels 2 in a solar power generation facility 1.

[0015] The protective tube 5 may be a known corrugated tube made of resin with recesses and protrusions formed on its outer surface. The protective tube 5 can also be referred to as a "tubular member." An example of a tubular member is a flexible electric pipe (FEP) pipe (also called a "corrugated rigid polyethylene pipe"). With this configuration, the protective tube 5 adequately protects the wiring 4 passing through the conduit inside.

[0016] 1, various embodiments of the protective pipe 10 with a wiring fixing function are indicated by reference numerals 10A, 10B, and 10C. However, these are merely examples of possible embodiments. Any number of protective pipes 10 with a wiring fixing function of various embodiments can be installed in any part of the protective pipe 5 depending on the installation state of the photovoltaic power generation facility 1 and its equipment.

[0017] The characteristic arrangement of the protective tubes 10A, 10B, and 10C with wiring fixing functions shown in FIG. 1 is as follows. Protective tube 10A is buried underground 100 from one end to the other, extending horizontally. Protective tube 10B has one end buried underground 100 and extends horizontally up to the middle of its length, then changes direction to a nearly vertical direction and continues to the other end. The other end of protective tube 10B, the end closest to solar panel 2 in the example shown in FIG. 1, is located above ground level and close to the electrical connection between wiring 4 and solar panel 2. Protective tube 10C has one end surface positioned flush or nearly flush with the wall surface of handhole portion 6B.

[0018] Figures 2 and 3 depict the protective tube with a wiring fixing function 10, more specifically, the protective tube with a wiring fixing function 10A shown in Figure 1. The cross-sectional view of Figure 3 shows the protective tube with a wiring fixing function 10 (10A) cut radially along the section line III-III shown in Figure 2. The configurations of the protective tubes with a wiring fixing function 10B and 10C are essentially the same as the configurations shown in Figures 2 and 3, so cross-sectional views of the protective tubes 10B and 10C are omitted.

[0019] In this embodiment, a hardening material 12 is filled in a hardened state in a section of the internal conduit of the protective tube 5, through which the wiring 4 is inserted over its entire length, and this section filled with the hardening material 12 corresponds to the protective tube 10 with a wiring fixing function. The hardening material 12 firmly surrounds and fixes the wiring 4 within the conduit of the protective tube 5. Therefore, the wiring 4 inserted inside the protective tube 10 with a wiring fixing function is fixed to the protective tube 10 via the hardening material 12, and even if the wiring 4 is cut outside the protective tube 10 and pulled, it cannot be pulled out.

[0020] In this embodiment, cement-based materials such as concrete, mortar, and cement paste can be used as the hardening material 12. Concrete is particularly suitable as the hardening material 12. However, other materials can also be used as the hardening material 12, such as resin materials, urethane foam, gypsum, glass, or metal. Any material can be used as the hardening material 12 as long as it can be injected and filled in a fluid state into the protective tube 5 through which the wires are inserted when creating the protective tube 10 with a wire fixing function, and hardens while surrounding the wires 4 within the protective tube 5 through a hardening reaction after filling. The wire 4 fixing function, or in other words, the pull-out prevention function, of the present invention is achieved by filling the protective tube 10 with the hardened material 12 in a hardened state.

[0021] As shown in FIG. 2 , the protective tube 10 with a wiring fixing function according to this embodiment includes end caps 14 at both ends of the section that forms the protective tube 10. The end caps 14 are made of a low-permeability material that exhibits low permeability to the hardening material 12 when in a fluid state before hardening. A suitable example of a low-permeability material for forming the end caps 14 is a clay-based material that exhibits low permeability to the hardening material 12 and exhibits excellent plasticity. A clay-based material can be easily formed at positions within the protective tube 5 that correspond to both ends of the protective tube 5 with a wiring fixing function to be created, completely blocking the conduit within the protective tube 5, regardless of the extension state of the protective tube 5 or the insertion state of the wiring 4 inside the conduit. Furthermore, using a clay-based material to form the end caps 14 makes it less likely that the hardening material 12, such as cement, will leak out of both ends of the protective tube 5 with a wiring fixing function before hardening.

[0022] However, the low-permeability material used as the raw material for the end cap 14 is not limited to a clay-based material. Any substance or material may be used as the low-permeability material as long as it is a material that does not allow permeation until the hardening material 12 has hardened, in relation to the material selected for the hardening material 12 to be poured into the protective tube. For example, a material such as metal or synthetic resin may be formed in advance into a lid shape that fits the dimensions of the internal conduit of the protective tube 5, and this lid may be placed inside the protective tube 5 to close the conduit.

[0023] The low-permeability material for the end cap 14 that prevents leakage of the curable material 12 before hardening is not limited to materials with high rigidity such as metal or synthetic resin, but may also be a low-rigidity material such as film. In other words, any material may be used as the low-permeability material as long as it can keep the curable material 12 injected into the protective tube 5 within a predetermined area without leaking until it hardens.

[0024] Depending on the embodiment of the protective tube 10 with a wiring fixing function according to the present invention, there may be cases where the end caps 14 are not left at the ends thereof. There are various reasons for this, but examples include cases where the end caps 14 were not used from the beginning when forming the protective tube 10 with a wiring fixing function, or cases where the end caps 14 were initially placed inside the protective tube to prevent the uncured hardening material 12 injected into the tube from leaking, but were then removed after the hardening material 12 had hardened inside the tube.

[0025] A material that is the same as or substantially similar to the hardening material 12 may be used as the low-permeability material for the end caps 14. In this case, when the protective tube with wiring fixing function 10 is cut along the longitudinal axis after the hardening material 12 has hardened, the cross section will appear as if the hardening material 12 is filled over the entire length.

[0026] Next, a method for forming an embodiment of the protective pipe 10 with a wiring fixing function according to the present invention will be described. When providing the protective pipe 10 with a wiring fixing function in the photovoltaic power generation facility 1, there are two possible cases: one is to form the protective pipe 10 with a wiring fixing function by processing a portion of the protective pipe 5 provided in an existing facility (particularly the photovoltaic power generation facility 1), and the other is to bury the protective pipe 10, which is originally equipped with a wiring fixing function, underground 100 in the process of constructing a new facility 1 itself. The method for forming the protective pipe 10 with a wiring fixing function will be described in detail below.

[0027] <Processing a Protective Pipe for an Existing Facility> First, a case where a portion of a protective pipe 5 installed in an existing photovoltaic power generation facility 1 is processed to form a protective pipe 10 with a wiring fixing function will be described with reference to Figures 4 and 5. Here, the case where an embodiment such as the protective pipe 10A with a wiring fixing function shown in Figure 1 is formed will be described as an example. Note that in Figures 4 and 5, the internal state of the protective pipes 5, 10, which is not normally visible when viewed from the outside, is represented by dashed lines. That is, in these drawings, the inner wall of the protective pipe and the components (wiring 4, end cap 14, hardening material 12) arranged within the conduit defined by the inner wall are represented by dashed lines.

[0028] The protective pipe 5, which is part of an existing facility, is mostly already buried underground 100 (see FIG. 4A). First, if necessary, the soil near the intended ends of the protective pipe 10A with wiring fixation function is excavated to expose the unprocessed protective pipe 5. Next, the exposed portion of the protective pipe 5 is processed, such as by incising, drilling, or cutting, without cutting the wiring 4. FIG. 4B shows an example of a case in which the protective pipe 5 is completely cut. This processing is performed to secure an entrance for an end cap 14, such as a clay-like material, that blocks the conduit extending inside the protective pipe 5. Therefore, as long as an entrance for the end cap 14 can be secured, it is not necessary to completely cut the protective pipe 5; a partial cut is sufficient. Any processing can be performed on the protective pipe 5 as long as a passage is secured to lead the end cap 14 from the outside of the protective pipe 5 into the conduit. For example, a processing such as cutting or drilling a portion of the protective pipe 5 can be performed.

[0029] 4, the portion of the protective tube 5 where the protective tube 10A with a wiring fixing function will be formed through a subsequent process is separated from the other portions of the protective tube 5. Hereinafter, in this application, the portion of the protective tube 5 where the protective tube 10A with a wiring fixing function will be formed will be described using the reference symbol 10a.

[0030] Next, a low-permeability material that can become the end caps 14 is used to seal both ends of the conduit that penetrates the inside of the protective tube 10a, as shown in Figure 4(C). The low-permeability material that can become the end caps 14 is inserted into the conduit from the cut location of the protective tube. In this case, it is particularly preferable to use a clay-based material as the low-permeability material that can become the end caps 14, because it can seal both ends of the conduit without any gaps, regardless of conditions such as the dimensions and arrangement of the internal conduit of the protective tube 10a and the dimensions and insertion state of each wire 4 that passes through the protective tube 10a.

[0031] However, it is also possible to prepare a part in the shape of the end cap 14 in advance and arrange it so as to close the end of the protective tube 10a. Below, several configuration examples of the end cap 14 will be described with reference to Figures 6 and 7.

[0032] The example configuration of the end cap 14 shown in Figure 6 is a disk-shaped, more specifically annular, cap made of a rubber-based material, with a shape and dimensions that allow it to be inserted into the conduit of the protective tube 10a. A central hole 22 is provided in the center of the rubber-based end cap 14, allowing the wire 4 inserted through the conduit of the protective tube 10a to be retained within the range of the hole wall that defines the spatial area of ​​the central hole 22. Furthermore, the rubber-based end cap 14 has a slit extending from the outer periphery of the disk to the central hole 22, which forms a passage 24 that allows the wire 4 to pass through and lead into the central hole 22. By using a material with a low elastic modulus and a high elastic limit, such as a rubber-based material, as the raw material for the end cap 14, that is, a material that is easily deformed and easily returns to its original shape, it is possible to form the diameter of the central hole 22 of the end cap 14 smaller than the diameter of multiple wires 4 when they are closely packed together into a single aggregate, and it is possible to form the width of the passage 24 narrower than the diameter of a single wire 4 or the aggregate. If the end cap 14 is easily deformed, the passage 24 can be temporarily widened to introduce the wire 4 into the central hole 22, and if the end cap 14 is easily returned to its original shape, the return of the end cap 14 will tighten the wire 4 fed into the central hole 22, strengthening the force that secures the wire 4.

[0033] The end cover 14 shown in FIG. 7 is a circular (annular) plate made of a highly rigid material such as metal. In the case of the end cover 14 shown in FIG. 7, the passage 24 extending from the outer periphery of the annular plate to the central hole 22 can be either open or closed. The end cover 14 of this example is configured with a door plate 26 that can be opened or closed. As shown in FIG. 7, when the door plate 26 is open, a passage 24 is formed that guides the wires 4 to the central hole 22. On the other hand, as shown by the dashed line in FIG. 7, when the door plate 26 is closed, the end cover 14 has a continuous annular shape, preventing the wires 4 once introduced into the central hole 22 from escaping through the passage 24. It is preferable to attach an opening / closing mechanism, such as a hinge 28, to the end cover body so that the door plate 26 can be freely opened and closed. Furthermore, it is preferable to provide fasteners on the main body of the end cover 14 and the door plate 26 to secure them together so as to maintain the shape of the annular plate, i.e., the closed state. This is a particularly effective configuration example when the dimensions of the entire assembly of wires 4 passing through the protective tube 5 are known.

[0034] Alternatively, a sheet made of a low-permeability material such as polyethylene or vinyl chloride resin may be used to cover the end of the protective tube 10a, leaving the extended portion of the wiring 4. In this case, the sheet serves as the end cover 14.

[0035] Returning to the explanation of the process for forming the protective tube 10A, as shown in FIG. 5A, an injection port 32 is formed in a portion of the protective tube 10a to allow the pre-hardening curing material 12 to be poured into the protective tube 10a. In the illustrated example, the injection port 32 is formed by cutting out a portion 10f of the surface wall near the end of the protective tube 10a. However, the method for forming the injection port 32 is not limited to this example. For example, in the process shown in FIG. 4C, a process for sealing both ends of the protective tube 10a's ductility with a low-permeability material 14 made of a clay-like material was described. However, it is also possible to seal both ends while leaving portions that can become injection ports 32, rather than completely sealing them.

[0036] It should be noted that the formation of the injection port 32 does not necessarily have to be performed after securing the inlet for the end cap 14 and disposing the end cap 14. For example, the injection port 32 may be formed before securing the inlet for the end cap 14, or at the same time as securing the inlet for the end cap 14 or disposing the end cap 14.

[0037] 5(B), the curable material 12 before hardening is injected into the conduit of the protective tube 10a through the injection port 32. At this time, it is preferable to use injection means 34 such as a pipe or a gutter for pouring the curable material 12 before hardening into the conduit of the protective tube 10a, as this makes it easier to inject the curable material 12 into the conduit of the protective tube 10a through the injection port 32.

[0038] After a certain amount of time has passed since the injection of the pre-hardening curable material 12 shown in FIG. 5B, the curable material 12 injected into the protective tube 10a hardens, forming one embodiment of the protective tube 10A with a wiring fixing function according to the present invention. It is preferable for the person who forms the protective tube 10A with a wiring fixing function to restore the protective tube 10A to its original state as much as possible during or after the hardening of the curable material 12. For example, as shown in FIG. 5C, it is preferable to return the surface wall portion 10f, which was once cut from the protective tube 10a, to its original position and adhere it to the remaining surface wall portion to close the injection port 32. Furthermore, if the protective tube 5 is completely or substantially completely cut to install the end cap 14 within the protective tube 10a, it is preferable to join the cut end of the protective tube 10A with the corresponding cut end of the protective tube 5 to prevent any exposed wires 4 from being exposed underground. The protective tube ends can be joined mechanically using a joining tool or chemically, such as by using an adhesive. Furthermore, it is preferable that the ground that has been dug up to form the protective pipe 10A with wiring fixing function be leveled back to its original state so that the protective pipe that was originally buried underground 100 is not visible from above ground. Note that the end caps 14 may be removed after the hardening material 12 has hardened, and then collected before the protective pipes 5, 10 are buried again in the ground.

[0039] 1 has been explained, the basic forming process is the same as that of the protective tube 10A when forming the protective tubes 10B and 10C. However, depending on the arrangement state of the protective tube 10 with the wiring fixing function, some of the above-mentioned steps can be omitted.

[0040] For example, in the case of protective tube 10B with a wiring fixing function, processing of protective tube 5 to secure an inlet for low-permeability material 14 is not always necessary. The end of protective tube 10B closest to solar panel 2 utilizes an initial position extending approximately vertically from that end. In the initial position of solar power generation facility 1, protective tube 5 surrounds wiring 4 from a position slightly away from the electrical joint between solar panel 2 and wiring 4, extends vertically downward, and reaches underground 100. In this initial position, uncured curable material 12 is injected into the conduit of protective tube 5 from the end of protective tube 5 exposed above ground. Once a predetermined amount of curable material 12 has been injected, but not until it overflows from protective tube 5, the injection is stopped and the curable material 12 is allowed to harden. By performing such processing, protective tube 10B with a wiring fixing function can be formed without requiring a process related to end cap 14.

[0041] In addition, in the case of the protective pipe 10C with wiring fixing function, a worker can enter the handhole portion 6B and install the end cap 14 inside the conduit of the protective pipe 5 extending from the wall surface of the handhole portion 6B to the underground 100 side, thereby eliminating the need to perform operations such as cutting, incising, or drilling on the protective pipe 5 to secure the entrance for the end cap 14.

[0042] <Installing a protective pipe with a wiring fixing function from the beginning of the facility construction> A description will also be given of a case where a protective pipe to be buried underground is equipped with a wiring fixing function from the beginning when constructing a new solar power generation facility 1. Even in this case, the basic construction process of the solar power generation facility 1 is almost the same as a general construction process, but some steps are unique steps required to form the protective pipe with a wiring fixing function according to the present invention.

[0043] For example, an injection port 32 for pouring the pre-hardened hardening material 12 can be provided in advance in the protective pipe 10a before it is buried in the ground 100. The injection port 32 may be created by cutting out, drilling, or the like in the surface wall of the existing protective pipe, or the injection port 32 may be provided from the beginning of manufacturing the protective pipe 10a. When the injection port 32 is provided in advance in the protective pipe 10a before it is buried in the ground 100, it is preferable to also prepare in advance a surface wall portion 10f corresponding to a lid for the injection port 32.

[0044] For the end cap 14, it is preferable to prepare a clay-based material that can function as a cap to prevent leakage of the unhardened hardened material 12 by disposing it inside the protective tube 10a, or to obtain a cap such as that shown in Figures 6 and 7 in advance. Alternatively, instead of preparing the end cap 14 or a material that can become the end cap 14, at least one of the multiple partial protective tubes that will become part of the protective tube 5 used to protect the wiring 4 connecting the constituent equipment (2, 3) of the solar power generation facility 1 after being buried underground 100 may be shaped to be suitable for forming the protective tube 10 with a wiring fixing function. Figure 8 shows an example of the shape of the partial protective tube 10a suitable for forming the protective tube 10 with a wiring fixing function. In this example, the partial protective tube 10a has end walls 10w surrounding an opening 10h in the radial cross section at both ends of the long tube, leaving only an opening 10h large enough to pass the bundle of wiring 4 used in the equipment 1. By adopting this configuration, after the wires 4 have been inserted through the openings at both ends of the protective tube 10a, there is no need to close the conduit inside the protective tube with the end caps 14. In other words, it is possible to omit part of the process of forming the protective tube 10 with a wire fixing function, and it is possible to more easily prevent the wires 4 from being pulled out.

[0045] Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiments. It is apparent to those skilled in the art that various modifications and substitutions of components are possible without departing from the scope and spirit of the appended claims, or that equivalents to the above-described embodiments may be constructed.

[0046] 1 Photovoltaic power generation facility 4 Wiring 5 Protective tube 10 (10A, 10B, 10C) Protective tube with wiring fixing function 10a Protective tube with wiring fixing function (in process of formation) 10f Protective tube surface wall portion 10h Protective tube opening 10w Protective tube end wall 12 Hardening material 14 End cover 32 Inlet

Claims

1. A protective tube with a wiring fixing function, which has a conduit and protects wiring that passes through the conduit, wherein wiring that connects equipment within a facility is formed in at least a section of the protective tube that passes through the conduit, and the conduit within that section is filled with a hardening material that hardens while surrounding the wiring, and the wiring is fixed to the protective tube within that section via the hardening material.

2. A protective pipe with a wiring fixing function as described in claim 1, wherein an end cap that closes the conduit is disposed on at least one of the ends of the forming section of the protective pipe with a wiring fixing function.

3. A protective pipe with a wiring fixing function according to claim 1 or 2, wherein the hardening material is a cement-based material.

4. A method for forming a protective tube with a wiring fixing function, comprising: a step of forming a lid or an equivalent part that blocks the protective tube at at least one point using a low-permeability material that does not allow the hardening material to pass through before hardening; and a step of injecting the hardening material before hardening into the inside of the tube, the at least one point of which is blocked by the lid or the equivalent part, while the wiring is inserted through the protective tube.

5. A forming method as claimed in claim 4, further comprising the steps of: at least partially cutting the protective pipe through which the wiring is inserted and which is buried underground; inserting the low-permeability material or a lid made of the low-permeability material into the conduit from the cut part of the protective pipe and arranging the low-permeability material or a lid made of the low-permeability material so as to close the conduit; and providing an injection port for pouring the pre-hardening hardening material into the conduit of the protective pipe.

6. A method for forming a protective pipe according to claim 4 or 5, wherein the hardening material is a cement-based material.

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