Communication facility

Abstract

To improve the stability of communication using PLC.SOLUTION: In a PLC communication facility S1 that performs communication between communication devices Cm and Ct through a power line PL1, fluorescent lamps FL or the like are not connected to the power line PL1 between the communication devices Cm and Ct, but a plurality of fluorescent lamps FL or the like are electrically connected collectively to a power line PL2 that branches off from the end of the power line PL1 on a working face Tf side. This can reduce the effect of noise generated by the fluorescent lamps FL or the like on a communication signal transmitted to the power line PL1, improving the stability of the PLC communication between the communication devices Cm and Ct.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to communication equipment, and more particularly to a technique that is effective when applied to communication equipment used for communication between a tunnel mouth side and a tunnel face side when constructing a tunnel by tunneling work, for example. [Background technology]

[0002] During tunnel construction, it is common to lay a LAN cable for communication inside the tunnel to monitor the tunnel face and to communicate between the tunnel entrance and the tunnel face. However, when tunnel construction is performed using tunnel tunneling, the LAN cable for communication and the power line for power supply must both be detached and attached at the tunnel entrance when connecting the following tunnel pipe, which is time-consuming.

[0003] In particular, in the case of long-distance R&C construction (a tunnel construction method in which multiple pipe roofs are arranged underground in a rectangular shape and the entire rectangle is replaced with a culvert (hereinafter referred to as R&C)), the number of thrust pipes increases, so the number of times that communication LAN cables and power lines need to be disconnected also increases. Also, in the case of large-section R&C construction, the number of thrust pipes installed on the outer periphery of the tunnel increases, so the number of times the above-mentioned wiring needs to be disconnected increases, and the work becomes extremely complicated when multiple thrust pipes (faces) are constructed at the same time. For this reason, the issue is how to reduce the total number of wiring.

[0004] In addition, thin, low-durability LAN cables are used in harsh environments, and during tunneling work the LAN cables must be detached and reattached every time a tunneling pipe is added, making the LAN cables prone to physical damage and communication interruptions.

[0005] Another method is to use wireless communication such as Wi-Fi (Wireless Fidelity) instead of LAN cables for communication, but the cross-section (diameter) of the tunneling pipes used in tunneling work is small, and because there are people and debris transport carts inside these small tunneling pipes, there is not much clearance, making it difficult to achieve stable communication.

[0006] Therefore, it was decided to introduce power line communications (hereinafter abbreviated as PLC) as a method of communication between the mine mouth and the face during the construction of the mine. PLC is a communication technology that uses power lines as communication lines. Such mine communication technology using PLC is described, for example, in Patent Document 1, which discloses a technology that uses power lines for power and lighting that are installed during the construction of the mine as communication cables. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 7-58675 Summary of the Invention [Problem to be solved by the invention]

[0008] By the way, when a PLC is used, there is no need to lay LAN cables for communication, so the total number of wiring can be reduced and the effort required for connecting and disconnecting wiring can be significantly reduced.

[0009] Furthermore, since a highly durable power line is used as the communication line, the wiring can be prevented from being physically damaged even in a harsh environment or when the wiring is frequently connected and disconnected, and communication interruptions caused by wiring damage can be prevented.

[0010] For this reason, PLC is suitable as a means of communication between the mine head and the face during tunneling work; however, there is an issue that communication can easily become unstable due to the effects of noise from electrical equipment (loads) such as lighting and tools that are connected to the power lines used for communication.

[0011] One possible solution to this problem would be to connect a noise filter to each electrical device connected to the power line, but this would drastically increase costs and effort, making it impractical.

[0012] The present invention has been made in light of the above technical background, and has an object to provide a technique capable of improving the stability of communication using PLC.

[0013] Another object of the present invention is to provide a technique that can further improve the stability of communications using PLC without increasing the effort and cost required for connecting a noise filter.

[0014] Another object of the present invention is to provide a technique capable of improving the stability of communication using PLC in tunneling work.

[0015] Another object of the present invention is to provide a technology that can further improve the stability of communication using PLC without increasing the effort and cost required for connecting noise filters during tunneling work.

[0016] A further object of the present invention is to provide a technique capable of reducing the labor required for attaching and detaching wiring during tunneling work. [Means for solving the problem]

[0017] In order to solve the above problem, the communication equipment of the present invention described in claim 1 is characterized by having a power source, a first power line electrically connected to the power source, a first communication means electrically connected to the first power line, a first PLC means electrically connected between the first power line and the first communication means and allowing the first power line to be used as a communication line, a second communication means electrically connected to the first power line at a position away from the first communication means, a second PLC means electrically connected between the first power line and the second communication means and allowing the first power line to be used as a communication line, a second power line branched off from the first power line while being electrically connected to the first power line, and a load electrically connected to the second power line.

[0018] The communication equipment of the present invention described in claim 2 is characterized in that, in the invention described in claim 1, at least one of the first power line and the second power line is composed of a single power line or a plurality of power lines connected in series.

[0019] The communication equipment of the present invention as set forth in claim 3 is characterized in that, in the invention as set forth in claim 1, the load is a lighting means.

[0020] The communication equipment of the present invention as described in claim 4 is characterized in that, in the invention as described in claim 3, the lighting means is an LED hose light having multiple LEDs arranged in a row and configured so that it can be handled as a single unit.

[0021] The communication equipment of the present invention described in claim 5 is characterized in that, in the invention described in claim 4, the LED hose light is composed of one LED hose light or multiple LED hose lights connected in series via the second power line.

[0022] The communication equipment of the present invention as described in claim 6 is characterized in that, in the invention as described in claim 4 above, the first power line is configured by connecting in series a plurality of power lines of a predetermined first unit length, and the LED hose light is configured by connecting in series a plurality of LED hose lights of a predetermined second unit length through the second power line, and the first unit length is an integer multiple of the second unit length.

[0023] The communication equipment of the present invention as set forth in claim 7 is characterized in that, in the invention as set forth in claim 3, the lighting means is a plurality of LED lights.

[0024] The communication equipment of the present invention as set forth in claim 8 is characterized in that, in the invention as set forth in claim 3, the lighting means is a plurality of fluorescent lamps.

[0025] The communication equipment of the present invention described in claim 9 is characterized in that, in the invention described in any one of claims 1 to 8, a noise filter is electrically connected between the branch point of the first power line and the second power line and the load.

[0026] The communication equipment of the present invention described in claim 10 is characterized in that, in the invention described in any one of claims 1 to 8 above, the line length between the branch point of the first power line and the second power line and the load is equal to or longer than a predetermined length.

[0027] The communication equipment of the present invention as set forth in claim 11 is characterized in that, in the invention as set forth in claim 10, the predetermined length is 2 m.

[0028] The communication equipment of the present invention described in claim 12 is the invention described in any one of claims 1 to 8 above, characterized in that the first communication means and the first PLC means are installed outside a tunnel constructed by tunnel tunneling work, the second communication means and the second PLC means are installed around the face of the tunnel, and the first power line and the second power line are installed inside the tunnel, and communication is performed between the first communication means and the second communication means, and that the first power line is disconnected from the power source prior to installing a tunnel tunneling pipe at the tunnel mouth, and the first power line is electrically connected to the power source in a detachable state so as to be electrically connected to the power source after the tunnel tunneling pipe is installed at the tunnel mouth.

[0029] The communication equipment of the present invention described in claim 13 is characterized in that, in the invention described in claim 12, a noise filter is electrically connected between the branch point of the first power line and the second power line and the load.

[0030] The communication equipment of the present invention described in claim 14 is characterized in that, in the invention described in claim 12, the line length between the branch point of the first power line and the second power line and the load is equal to or longer than a predetermined length.

[0031] The communication equipment of the present invention as set forth in claim 15 is characterized in that, in the invention as set forth in claim 14, the predetermined length is 2 m. Effect of the Invention

[0032] According to the present invention, it is possible to improve the stability of communication using PLC.

[0033] Furthermore, according to the present invention, it is possible to further improve the stability of communication using PLC without increasing the effort and cost required for connecting a noise filter.

[0034] Furthermore, according to the present invention, it is possible to improve the stability of communication using PLC in tunneling work.

[0035] Furthermore, according to the present invention, it is possible to further improve the stability of communication using PLC without increasing the effort and cost required for connecting noise filters in tunneling work.

[0036] Furthermore, according to the present invention, it is possible to reduce the effort required for attaching and detaching wiring during tunneling work. [Brief description of the drawings]

[0037] [Figure 1] (a) is a diagram of the configuration of a PLC communication equipment that uses a power line as a communication line when there is no load, and (b) is a table showing the measurement results of the communication speed of the PLC communication equipment in Figure 1(a). [Diagram 2] (a) is a diagram of the configuration of a PLC communication system that uses the power lines used to connect LED lighting as communication lines, and (b) is a table showing the measurement results of the communication speed of the PLC communication system in Figure 2(a). [Diagram 3] (a) is a diagram showing the configuration of a PLC communication system that uses the power line used when connecting tools as the communication line, and (b) is a table showing the measurement results of the communication speed of the PLC communication system in Figure 3(a). [Figure 4]This is a configuration diagram of a PLC communication system that uses power lines as communication lines for communication between the tunnel mouth and face during tunnel tunneling work. [Diagram 5] This is a table showing the measurement results of the communication speed of the PLC communication equipment in Figure 4. [Figure 6] This is a diagram showing the configuration of a standard PLC communication system that uses power lines as communication lines between the tunnel mouth and face during tunnel tunneling work. [Figure 7] FIG. 7 is a table showing the measurement results of communication speed in the standard PLC communication equipment of FIG. [Figure 8] 1 is a configuration diagram of an example of a PLC communication facility according to an embodiment of the present invention. [Figure 9] 9 is a table showing the measurement results of communication speed in the PLC communication equipment of FIG. 8. [Figure 10] 7 is a main circuit diagram showing an example of the effect of noise generated in a load electrically connected to a power line in the PLC communication facility of FIG. 6 on a power line communication signal. [Figure 11] 9 is a main circuit diagram showing in schematic form the influence that noise generated in a load electrically connected to a power line in the PLC communication facility of FIG. 8 has on a power line communication signal. [Figure 12] 12 is a main circuit diagram showing a schematic diagram of the PLC communication facility shown in FIG. 11 in a state where a noise filter is connected. [Figure 13] FIG. 13 is a circuit diagram of an example of the noise filter of FIG. 12. [Figure 14] FIG. 11 is a configuration diagram of an example of a PLC communication facility according to another embodiment of the present invention. [Figure 15] (a) is a schematic diagram of an LED hose light, and (b) is a circuit diagram of an example of an LED hose light. [Figure 16] 15 is a table showing the measurement results of communication speed in the PLC communication equipment of FIG. 14. [Figure 17]17(a) is a longitudinal section of a tunnel formed by the tunnel jacking method of this embodiment, (b) is a plan view of one unit of LED hose light to be installed in the tunnel of Figure 17(a), and (c) is a plan view of one unit of power line that constitutes the communication equipment used in the tunnel of Figure 17(a). [Figure 18] FIG. 17(a) is a longitudinal section of the well after the thrusting process. [Figure 19] FIG. 19 is a longitudinal cross-sectional view of the tunnel after the thrust process of FIG. 18. [Figure 20] 20(a) is a longitudinal cross-sectional view of the shaft after the driving process in FIG. 19, and FIG. 20(b) is a longitudinal cross-sectional view of the shaft after the driving process in FIG. 20(a). [Figure 21] 20(a) is a longitudinal cross-sectional view of the shaft after the driving process in FIG. 20(b), and FIG. 21(b) is a longitudinal cross-sectional view of the shaft after the driving process in FIG. 21(a). [Figure 22] (a) is a longitudinal cross-section of the tunnel after the thrust process of Figure 21(b), and (b) is a longitudinal cross-section of the tunnel after the thrust process of Figure 22(a). [Figure 23] (a) is a longitudinal cross-section of the tunnel after the thrust process of Figure 22(b), and (b) is a longitudinal cross-section of the tunnel after the thrust process of Figure 23(a). [Figure 24] FIG. 23(b) is a longitudinal section of the well after the thrusting process. [Diagram 25] 25(a) is a longitudinal cross-sectional view of the tunnel after the thrust process in FIG. 24, and FIG. 25(b) is a longitudinal cross-sectional view of the tunnel after the thrust process in FIG. 25(a). [Figure 26] FIG. 13 is a configuration diagram of an example of a PLC communication facility according to a third embodiment of the present invention. [Figure 27] FIG. 13 is a configuration diagram of an example of a PLC communication facility according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and the repeated description will be omitted.

[0039] (First embodiment)

[0040] Figure 1(a) is a diagram of the configuration of a PLC communication equipment that uses a power line as a communication line when there is no load, and Figure 1(b) is a table showing the measurement results of the communication speed of the PLC communication equipment in Figure 1(a).

[0041] As shown in FIG. 1(a), the PLC communication equipment S50 is a communication equipment that transmits high-speed communication signals by superimposing a high-frequency carrier signal, for example, at a frequency of 2 MHz to 28 MHz, on a power line PL1, and includes the power line PL1, communication devices Cm, Ct, and PLC modems Mm, Mt.

[0042] The power line PL1 is a power supply wiring whose main purpose is to supply AC power (AC100V, 50 / 60Hz) to a load as a power source, and is composed of, for example, multiple branch cables. The total length of one branch cable unit is, for example, 20m. Plug-in connectors PiC are provided at both ends in the longitudinal direction of each branch cable, and the branch cables and the branch cables and the PLC modems Mm, Mt are electrically connected to each other in a detachable manner via the plug-in connectors PiC. However, no loads such as lighting are connected to the power line PL1 between the communication devices Cm, Ct.

[0043] The communication device Cm is, for example, a pocket WiFi or an NTT wired connection, and is electrically connected to one end of the power line PL1 via a PLC modem Mm. The communication device Ct is, for example, a personal computer, and is electrically connected to the other end of the power line PL1 via a PLC modem Mt.

[0044] The PLC modems Mm and Mt are communication devices used when communicating using the power line PL1, and have the function of superimposing or separating a carrier wave carrying a data communication signal onto or from the power line PL1. Therefore, the power line PL1 is also a signal wiring (communication line) that transmits signals used for communication between the communication devices Cm and Ct.

[0045] In the PLC communication equipment S50, the communication speed between the communication devices Cm and Ct was measured when the power line PL1 was extended one unit at a time. Note that the power line PL1 was extended while still wound due to the constraints of the work area.

[0046] As a result, as shown in Figure 1(b), the communication speed under no load dropped off rapidly once the distance exceeded 200m as per the manufacturer's specifications, and at 250m it became impossible to connect. Under no load, if the length of the power line PL1 is up to 200m, there is almost no effect on the communication speed. Note that the communication speed fluctuates, so it is only a reference value. The unit of communication speed is Mbps. In Figure 1(b), D is download and U is upload.

[0047] Figure 2(a) is a diagram of the configuration of a PLC communication system that uses the power lines used to connect LED lighting as communication lines, and Figure 2(b) is a table showing the measurement results of the communication speed of the PLC communication system in Figure 2(a).

[0048] As shown in Fig. 2(a), the power line PL1 of the PLC communication equipment S51 is composed of one branch cable unit. Note that the power line PL1, the communication devices Cm, Ct, and the PLC modems Mm, Mt are the same as those described in Fig. 1(a), so the description will be omitted.

[0049] Here, the communication speed between the communication devices Cm and Ct was measured when the number of LED (Light Emitting Diode) lights LE electrically connected to the power line PL1 (one unit of branch cable) was increased. The wattage of the LED lights LE was, for example, 24 W.

[0050] As a result, as shown in Figure 2(b), the communication speed was significantly affected by the LED lighting LE, with communication connection becoming almost impossible when there were five LED lighting LEs, and completely impossible when there were six. When a camera or other device was actually electrically connected to the other end of the power line PL, as shown in the measurement results, it was fine when the communication speed was fast, but when the communication speed was slow, problems occurred with interruptions in video and audio.

[0051] Figure 3(a) is a diagram of the configuration of a PLC communication system that uses the power line used when connecting tools as the communication line, and Figure 3(b) is a table showing the measurement results of the communication speed of the PLC communication system in Figure 3(a).

[0052] As shown in Fig. 3(a), the power line PL of the PLC communication equipment S52 is composed of one unit of branch cable, and the communication speed between the communication devices Cm, Ct was measured when the number of tools TL electrically connected to the power line PL1 (one unit of branch cable) was increased. Note that the power line PL1, the communication devices Cm, Ct, and the PLC modems Mm, Mt are the same as those described in Fig. 1(a), so their description will be omitted. The tool TL is, for example, a baby sander (800W).

[0053] As a result, as shown in Fig. 3(b), the communication speed was hardly affected by the tool TL. However, in actual work, load fluctuations occur, so the situation is unclear.

[0054] Figure 4 is a configuration diagram of a PLC communication equipment that uses power lines as communication lines for communication between the tunnel mouth and face during tunnel tunneling work, and Figure 5 is a table showing the measurement results of the communication speed of the PLC communication equipment in Figure 4.

[0055] Jacking work involves the process of repeatedly pushing a jacking pipe into the ground from the side of a vertical shaft to install multiple jacking pipes in series when constructing a tunnel. There are various methods, such as using the jacking pipes themselves to construct the tunnel, or the R&C method, in which a box-shaped roof is formed by arranging multiple jacking pipes around the perimeter of the tunnel, and then replacing the box-shaped roof with a box-shaped tunnel structure to construct the tunnel.

[0056] As shown in FIG. 4, the PLC communication equipment S53 is, similarly to the above, a communication equipment that transmits high-speed communication signals by superimposing a high-frequency carrier signal, for example, of a frequency of 2 MHz to 28 MHz, on a power line PL1, and includes a power source P, a power line PL1, a PLC modem Mm on the master M side, communication equipment Cm on the master M side, a PLC modem Mt on the terminal T side, communication equipment Ct on the terminal T side, a plurality of fluorescent lamps FL, and an LED lighting unit LP.

[0057] The power supply P is a power supply circuit that supplies AC 100V (50 / 60Hz) and includes a transformer Tr (e.g., AC 400V / 200V-100V, 250KVA) and a distribution board DB electrically connected to the rear of the transformer Tr. One end of a power supply power line PLn1 (e.g., AC1φ2, 100V) electrically connected to the distribution board DB is electrically connected in a detachable manner to a plug connection part PiC at one longitudinal end of the power line PL1.

[0058] The power line PL1 of the PLC communication equipment S53 is, as mentioned above, a power supply wiring whose main purpose is to supply AC 100V (50 / 60Hz) supplied from the power source P to loads such as the communication equipment Cm, Ct, PLC modems Mm, Mt, fluorescent lamps FL, LED lighting units LP, etc., and is also a signal wiring (communication line) for transmitting signals used for communication between the communication equipment Cm, Ct. The power line PL1 of the PLC communication equipment S53 is composed of, for example, one unit of branch cable, and its total length (unit length) is, for example, about 20 m.

[0059] The communication equipment Cm on the master M side includes, for example, a personal computer PC for measurement, a tablet TB, and a microphone MC electrically connected to the tablet TB, and is electrically connected to one end side of the power line PL1 (the entrance Tm side of the well TN) via the PLC modem Mm on the master M side.

[0060] On the other hand, the communication equipment Ct on the terminal T side includes, for example, a single-board computer SBC, a camera CS electrically connected to the single-board computer SBC, and a speaker SP, and is electrically connected to the other end side of the power line PL1 (the face Tf side of the tunnel TN) via the PLC modem Mt on the terminal T side.

[0061] A plurality of fluorescent lamps FL are electrically and detachably connected directly to the power line PL1 between the communication devices Cm and Ct at predetermined intervals d1, which may be, for example, about 3 m.

[0062] In addition, a power line PLn2 is electrically connected in a detachable manner to the plug connection part PiC on the other end side (face Tf side) of the power line PL1, and the LED lighting LE1 and LED floodlight LE2 of the LED lighting unit LP are electrically connected to the power line PLn2.

[0063] Here, we measured the effect of LED lighting (LED lighting LE1 and LED floodlight LE2) and fluorescent lighting FL on PLC communication. In other words, we measured the communication speed between communication devices Cm and Ct when the on / off state of the LED lighting and fluorescent lighting was changed.

[0064] As a result, as shown in Figure 5, the TCP / IP values ​​improved significantly when the LED lighting was turned off (OFF) and the fluorescent lighting was turned on (ON) compared to when the LED lighting and fluorescent lighting were turned on (ON).

[0065] Furthermore, there is no change in the TCP / IP values ​​when the LED lighting is turned off (OFF) and the fluorescent lighting is turned on (ON) and when both the LED lighting and the fluorescent lighting are turned off (OFF).

[0066] These findings show that fluorescent lighting has less of an impact on communications than LED lighting.For each experiment, PHY, TCP / IP and ping speeds were measured and evaluated, with emphasis placed on the evaluation of TCP / IP, which is an indicator of communications performance under real-world conditions.

[0067] Figure 6 is a configuration diagram of a standard PLC communication equipment that uses power lines as the communication lines for communication between the tunnel mouth and the tunnel face during tunnel tunneling work, and Figure 7 is a table showing the measurement results of the communication speed for the standard PLC communication equipment in Figure 6.

[0068] The configuration of the PLC communication equipment S54 in Fig. 6 is almost the same as the configuration of the PLC communication equipment S53 in Fig. 4. However, in the PLC communication equipment S54 in Fig. 6, the power line PL1 is composed of, for example, three branch cables, and the total length thereof is, for example, about 60 m.

[0069] Here, the communication speed between the communication devices Cm and Ct was measured in a case where no fluorescent lamp FL was connected to the power line PL1 and in a case where ten additional fluorescent lamps FL were electrically connected to the power line PL1.

[0070] As a result, as shown in FIG. 7, when ten additional fluorescent lamps FL were electrically connected to the power line PL1, the TCP / IP value indicated that communication was not possible.

[0071] Furthermore, when a fluorescent lamp FL was electrically connected to the power line PL1, the PHY speed in communication from the communication device Ct on the terminal T side to the communication device Cm on the master M side became "1," and the communication quality significantly deteriorated.

[0072] From these facts, it can be seen that even if fluorescent lamps FL, which have little effect, are used, communication will not be possible if measures are not taken under the above conditions.

[0073] FIG. 8 is a diagram showing an example of a PLC communication facility according to an embodiment of the present invention, and FIG. 9 is a table showing the measurement results of communication speed in the PLC communication facility of FIG.

[0074] As shown in Fig. 8, in this embodiment, a case where a PLC communication facility S1 is applied to communication between the mouth Tm side and the face Tf side of a tunnel TN formed by tunneling work will be described. Note that the tunneling work is the same as that described in Fig. 4, so the description will be omitted.

[0075] The PLC communication equipment S1 of this embodiment is a communication equipment that transmits high-speed communication signals by superimposing a high-frequency carrier signal of a frequency of, for example, 2 MHz to 28 MHz on a power line PL1, as described above, and includes a power source P, a power line (first power line) PL1, a PLC modem (first PLC means) Mm on the master M side, a communication device (first communication means) Cm on the master M side, a PLC modem (second PLC means) Mt on the terminal T side, a communication device (second communication means) Ct on the terminal T side, a power line (second power line) PL2, a plurality of fluorescent lamps (loads, lighting means) FL, and a noise filter NF. Note that the power source P, the PLC modems Mm, Mt, and the communication devices Cm, Ct are the same as those described in FIG. 4, so their description will be omitted.

[0076] The power line PL1 of the PLC communication facility S1 of this embodiment is the same as that described in Fig. 6. That is, the power line PL1 is a power supply wiring that supplies AC power (AC 100V, 50 / 60Hz) supplied from a power source P to loads such as communication devices Cm, Ct, PLC modems Mm, Mt, and fluorescent lamps FL, and is also a signal wiring (communication line) that transmits signals used for communication between the communication devices Cm, Ct.

[0077] Therefore, in the PLC communication equipment S1 of this embodiment, there is no need to lay LAN cables for communication, so the total number of wirings can be reduced, and the effort required for connecting and disconnecting the wirings can be significantly reduced. Furthermore, since the durable power line PL1 is used as the communication line, the wirings can be prevented from being physically damaged even in harsh environments and during tunneling work in which the wirings are frequently connected and disconnected, and communication interruptions due to wiring damage can be prevented. Therefore, the PLC communication equipment S1 of this embodiment is suitable for tunneling work in which the wirings must be connected and disconnected every time a tunneling pipe is added.

[0078] However, in the PLC communication equipment S1 of this embodiment, unlike that described in Figures 4 and 6, loads such as fluorescent lamps FL are not connected to the power line PL1 between communication devices Cm and Ct, but are electrically connected together to the power line PL2.

[0079] The power line PL2 is electrically and detachably connected to a plug connection part PiC on the other end (face Tf) side of the power line PL1, and branches off from the power line PL1. The power line PL2 is, like the power line PL1, configured by, for example, a branch cable, and a plurality of fluorescent lamps FL are electrically connected to this power line PL2 at predetermined intervals. The power supplied from the power source P is supplied to the plurality of fluorescent lamps FL through the power lines PL1 and PL2.

[0080] The noise filter NF is formed of, for example, an EMC (Electromagnetic Compatibility) filter, and is electrically connected between a plug connection part PiC on the other end (face Tf) side of the power line PL1 and a group of fluorescent lamps FL.

[0081] Here, with ten fluorescent lamps FL electrically connected to the power line PL2, the communication speed between the communication devices Cm and Ct was measured with and without the noise filter NF.

[0082] As a result, as shown in Fig. 9, when a plurality of fluorescent lamps FL are connected together to a power line PL2, even if there is no noise filter NF, even if the length of the power line PL1 is the same as in Fig. 6, and even if the number of connected fluorescent lamps FL is the same, communication between the communication devices Cm and Ct is possible through the power line PL1. That is, in the PLC communication facility S1 of this embodiment, it is possible to improve the stability of PLC communication between the communication device Cm on the master M side (the mouth Tm side of the tunnel TN) and the communication device Ct on the terminal T side (the face Tf side of the tunnel TN).

[0083] Furthermore, when a noise filter NF is electrically connected between the plug connection part PiC on the other end (face Tf) side of the power line PL1 and a group of fluorescent lamps FL as shown in Fig. 8, the communication speed is 5-15 Mbps before the noise filter NF is connected, whereas the communication speed is 18-20 Mbps after the noise filter NF is connected, further improving the communication speed, as shown in Fig. 9. That is, in the PLC communication equipment S1 of this embodiment, by providing the noise filter NF, it is possible to further improve the stability of the PLC communication between the communication device Cm on the master M side (the mouth Tm side of the tunnel TN) and the communication device Ct on the terminal T side (the face Tf side of the tunnel TN).

[0084] Moreover, in the PLC communication equipment S1 of this embodiment, there is no need to connect a noise filter NF to each of multiple fluorescent lamps FL. It is sufficient to connect the noise filter NF to only one location for multiple fluorescent lamps FL, so there is no increase in costs and effort due to the use of the noise filter NF.

[0085] Here, Figure 10(a) is a main circuit diagram that shows typically the effect on the communication signal of noise generated in a load electrically connected to the power line in the PLC communication equipment of Figure 6, and Figure 10(b) is a main circuit diagram that shows typically the effect on the communication signal of noise generated in a load when the load is electrically connected further away from the power line than in Figure 10(a).

[0086] As shown in Fig. 10(a), in the case of the PLC communication equipment S54 in Fig. 6, since a load LD such as a plurality of lights (electronic devices) is directly connected to the power line PL1, the conduction noise Nc generated in the plurality of loads LD is transmitted to the power line PL1 and affects the communication signal Sg transmitted on the power line PL1 between the PLC modems Mm and Mt. Note that the symbol Nr indicates the radiation noise generated in the load LD.

[0087] Furthermore, as shown in FIG. 10(b), if the distance between the power line PL1 and the load LD is increased, the noise is attenuated by the resistance component and the coil component.

[0088] 11 is a circuit diagram of essential parts showing typically the effect on a communication signal of noise generated in a load electrically connected to a power line in the PLC communication equipment of the present embodiment shown in FIG. 8, FIG. 12 is a circuit diagram of essential parts showing typically the state in which a noise filter is connected to the PLC communication equipment of the present embodiment shown in FIG. 11, and FIG. 13 is a circuit diagram of an example of the noise filter of FIG. 12.

[0089] As shown in Fig. 11, in the case of the PLC communication equipment S1 of this embodiment in Fig. 8, a plurality of loads LD are electrically connected to the power line PL2 branched from the power line PL1, and one group of the loads LD is separated from the power line PL1, so that even if the number of loads LD is the same as in Fig. 10 (Fig. 6), the conductive noise Nc transmitted to the power line PL1 can be reduced more than in the case of Fig. 10 (Fig. 6). Therefore, in the PLC communication equipment S1 of this embodiment in Fig. 8, the stability of the communication signal Sg transmitted to the power line PL1 can be improved more than that of the PLC communication equipment S54 in Fig. 6.

[0090] Furthermore, as shown in Fig. 12, when a noise filter NF is electrically connected between the power line PL1 and a group of loads LD, the conduction noise Nc generated in the loads LD can be reduced from being transmitted to the power line PL1 as compared to the case of Fig. 11. Therefore, the stability of the communication signal Sg transmitted to the power line PL1 can be improved as compared to the case of Fig. 11.

[0091] Fig. 13 is a circuit diagram of an example of the noise filter of Fig. 12. The noise filter NF includes, for example, a plurality of capacitors C1 and C2, a plurality of resistors R, and a plurality of coils L. The capacitor C1 and the resistor R are electrically connected between the two wirings PL2a and PL2b constituting the power line PL2. The capacitor C2 is electrically connected between the wirings PL2a and PL2b and the ground G. The coil L is provided at two points midway along the length of the wirings PL2a and PL2b so as to inductively couple the wirings PL2a and PL2b. Such a noise filter NF has a high attenuation effect on noise in the PLC communication band.

[0092] (Second embodiment)

[0093] FIG. 14 is a configuration diagram of an example of a PLC communication facility according to the second embodiment of the present invention.

[0094] The PLC communication facility S2 of this embodiment is substantially the same as the PLC communication facility S1 described with reference to FIG. 8, and is configured to enable communication between communication devices Cm and Ct using the power line PL1 as a communication line.

[0095] Therefore, in the PLC communication facility S2 of this embodiment, as in the first embodiment, there is no need to lay a LAN cable for communication, so the total number of wirings can be reduced, and the effort of connecting and disconnecting the wirings can be significantly reduced. Furthermore, since the durable power line PL1 is used as the communication line, the wirings can be prevented from being physically damaged even in harsh environments and during tunneling work in which the wirings are frequently connected and disconnected, and communication interruptions due to wiring damage can be prevented. Therefore, the PLC communication facility S2 of this embodiment is also suitable for tunneling work in which the wirings must be connected and disconnected every time a tunneling pipe is added.

[0096] Here, the PLC communication equipment S2 of this embodiment differs from the PLC communication equipment S1 of FIG. 8 in that an LED hose light (load, lighting means) LE3 is electrically and detachably connected to the plug connection part PiC on the other end side (face Tf side) of the power line PL1 via the power line PL2.

[0097] FIG. 15(a) is a schematic diagram of an LED hose light, and FIG. 15(b) is a circuit diagram of an example of an LED hose light.

[0098] As shown in FIG. 15(a), the LED hose light LE3 is a hose-shaped lighting fixture that houses a plurality of LED lights DL in a series inside a transparent hose H (hollow tube).

[0099] The hose H of the LED hose light LE3 is made of, for example, a flexible resin, which allows the LED hose light LE3 to be carried in a rolled up state.

[0100] A power line PL2 extends from both ends of the LED hose light LE3 in the longitudinal direction. An outlet CNT is provided at the end of the power line PL2 extending from one end of the LED hose light LE3, and a plug PLG is provided at the end of the power line PL2 extending from the other end of the LED hose light LE3. The LED hose light LE3 can be extended by electrically and detachably connecting the plug PLG of the power line PL2 of the other LED hose light E3 to the outlet CNT of the power line PL2 of one LED hose light LE3.

[0101] As shown in Fig. 15(b), the multiple LED lights DL that make up the LED hose light LE3 are connected in series and electrically connected to the power line PL2 via the rectifier circuit REC. A drive circuit DRC is electrically connected between the group of LED lights DL and the rectifier circuit REC on the cathode side of the LED lights DL, so that the multiple LED lights DL (i.e., the LED hose light LE3) can be handled as a single unit. For this reason, by using the LED hose light LE3 as lighting in the tunnel TN (see Fig. 14), the effort required to install lighting in the tunnel TN can be significantly reduced compared to using multiple fluorescent lamps or multiple LED lights separately and independently.

[0102] FIG. 16 is a table showing the measurement results of communication speed in the PLC communication equipment of FIG.

[0103] In the PLC communication equipment S2 of this embodiment, communication is possible without any problem even if the noise filter NF is not connected. That is, in the PLC communication equipment S2 of this embodiment, the stability of PLC communication between the communication device Cm on the master M side (the mouth Tm side of the pit TN) and the communication device Ct on the terminal T side (the face Tf side of the pit TN) can be improved.

[0104] Also, by electrically connecting a noise filter NF between the plug connection part PiC on the other end (face Tf) side of the power line PL1 and the LED hose light LE3 as shown in Fig. 14, the communication speed was 14 to 18 Mbps before the noise filter NF was inserted, but after the noise filter NF was inserted, the communication speed became 19 to 20 Mbps, further improving the communication speed, as shown in Fig. 16. In other words, by providing the noise filter TNF in the PLC communication equipment S2 of this embodiment as well, the stability of the PLC communication between the communication device Cm on the master M side (mouth Tm side) and the communication device Ct on the terminal T side (face Tf side) can be further improved.

[0105] Moreover, in the PLC communication equipment S2 of this embodiment, there is no need to connect a noise filter NF to each of multiple fluorescent lamps FL. It is sufficient to connect the noise filter NF to only one location for multiple LED hose lights LE3, so there is no increase in costs and effort due to the use of the noise filter NF.

[0106] On the other hand, as shown in Fig. 16, even when the length (the length of the power line PL2) between the PLC modem Mt on the terminal T side and the LED hose light LE3 closest to it is about 2 m apart, communication was possible without any problem without connecting the noise filter NF. In other words, when the noise filter NF is not connected, it is preferable to set the length (the length of the power line PL2) between the PLC modem Mt on the terminal T side and the LED hose light LE3 closest to it to 2 m or more. This reduces the influence of noise from the LED hose light LE3 to the power line PL1 even when the noise filter NF is not connected, so that the stability of PLC communication between the communication device Cm on the master M side (the mouth Tm side of the tunnel TN) and the communication device Ct on the terminal T side (the face Tf side of the tunnel TN) can be improved.

[0107] Next, an example of a method of applying the PLC communication equipment of the present embodiment to a tunneling method will be described with reference to Fig. 17 to Fig. 25. Note that, for example, here, a case where the PLC communication equipment is applied to an R&C method in which a box-shaped roof is formed by arranging a plurality of tunneling pipes along the periphery of a tunnel, and then the box-shaped roof is replaced with a box-shaped tunnel structure to construct the tunnel will be described.

[0108] Figure 17(a) is a longitudinal section of a tunnel formed by the tunnel jacking method of this embodiment, Figure 17(b) is a plan view of one unit of LED hose light to be installed in the tunnel of Figure 17(a), and Figure 17(c) is a plan view of one unit of power line that constitutes the communication equipment used in the tunnel of Figure 17(a).

[0109] As shown in Fig. 17(a), a shaft is excavated by hand or by an excavator from the side of the shaft VH in a direction intersecting the side, and when the excavation length reaches the axial length of the cutting edge pipe (excavator) CP, the cutting edge pipe CP is pushed into the excavated shaft. The cutting edge pipe CP is also the excavator, and its axial length is, for example, about 4.4 m.

[0110] Next, communication equipment S1 of this embodiment is installed inside and outside the cut end pipe CP. That is, at a place where a LAN cable can be laid, such as an office or a station on the minehead Tm side of the cut end pipe CP, communication device Cm is electrically connected to one end of the power line PL1 via a PLC modem Mm. Meanwhile, at the face Tf side inside the cut end pipe CP, communication device Ct is electrically connected to the other end of the power line PL1 via a PLC modem Mt.

[0111] This allows communication between the communication equipment Ct on the face Tf side and the communication equipment Cm on the mine mouth Tm side to be carried out, for example, through the power line PL1 of the communication facility S1, or images taken by the camera CS (see Figure 14, etc.) of the communication equipment Ct on the face Tf side to be transmitted to the communication equipment Cm on the mine mouth Tm side through the power line PL1.

[0112] Also, the LED hose light LE3 is carried in a rolled-up state to the cutting face Tf side inside the cutting edge pipe CP, and one end of the power line PL2 of the LED hose light LE3 is electrically connected to the other end of the power line PL1. At this time, for example, the distance between the connection part connecting the PLC modem Mt and the power line PL1 and the connection part connecting the power line PL2 and the power line PL1 of the LED hose light LE3 is set to 2m or more. This can further improve the stability of communication when the power line PL1 is used as a communication line. However, as shown in FIG. 14, a noise filter NF may be provided between the plug connection part PiC on the other end (cutting face Tf) side of the power line PL1 and the LED hose light LE3.

[0113] Here, as shown in Fig. 17(b), the total length of one unit of the extended LED hose light LE3 is set to a predetermined unit length (second unit length), for example, about 10 m. On the other hand, as shown in Fig. 17(c), the total length of one unit of the extended power line PL1 is set to a predetermined unit length (first unit length), for example, about 20 m.

[0114] That is, in this embodiment, the total length of one unit of power line PL1 in an extended state is set to twice (an integer multiple) the total length of one unit of LED hose light LE3 in an extended state. As a result, as will be described later, when one unit of power line PL1 is added, one unit of LED hose light LE3 can also be added, so that the work of adding the power line PL1 and the LED hose light LE3 can be simplified.

[0115] Next, Figure 18 is a longitudinal cross-sectional view of the tunnel after the driving process of Figure 17(a), and Figure 19 is a longitudinal cross-sectional view of the tunnel after the driving process of Figure 18.

[0116] As shown in Fig. 18, the face Rf in the cutting pipe CP is excavated manually or by an excavator. During this, communication is performed between the communication equipment Ct on the face side and the communication equipment Cm on the wellhead side via the power line PL1 of the communication facility S1, for example, by transmitting an image taken by the camera CS (see Fig. 14, etc.) of the communication equipment Ct on the face side to the communication equipment Cm on the wellhead side via the power line PL1.

[0117] Next, when excavation has progressed to the axial length of the thrust pipe, the power line PL1 is disconnected from the power source P at the wellhead Tm side. Then, as shown in FIG. 19, the power line PL1 at the wellhead Tm side is retracted into the cutting edge pipe CP.

[0118] Next, Figure 20(a) is a longitudinal cross-sectional view of the tunnel after the driving process of Figure 19, and Figure 20(b) is a longitudinal cross-sectional view of the tunnel after the driving process of Figure 20(a).

[0119] As shown in Fig. 20(a), the thrust pipe PP is inserted into the vertical shaft VH and is installed with the tip end surface of the thrust pipe PP aligned with the rear end surface of the cutting edge pipe CP. The axial length of this thrust pipe PP is, for example, about 3 m.

[0120] Next, the power line PL1 that was retracted inside the cutting edge pipe CP is extended through the thrust pipe PP to the mine mouth Tm side. Then, as shown in Fig. 20(b), the extended power line PL1 is electrically connected to the power source P outside the mine. At this stage, the rear end of the LED hose light LE3 inside the cutting edge pipe CP may be extended and installed to the mine mouth Tm side of the thrust pipe PP.

[0121] Next, Figure 21(a) is a longitudinal cross-sectional view of the tunnel after the thrust process of Figure 20(b), and Figure 21(b) is a longitudinal cross-sectional view of the tunnel after the thrust process of Figure 21(a).

[0122] As shown in Fig. 21(a), the thrust pipe PP is pushed into the ground from the side of the shaft VH using a jack (not shown) or the like, and then the LED hose light LE3 in the cutting edge pipe CP is extended and installed through the thrust pipe PP to the mine mouth Tm side as shown in Fig. 21(b). During this time, communication is performed between the communication devices Cm and Ct, for example, by transmitting images taken by the camera CS (see Fig. 14, etc.) of the communication device Ct on the face side to the communication device Cm on the mine mouth side via the power line PL1.

[0123] Next, Figure 22(a) is a longitudinal cross-section of the tunnel after the thrust process of Figure 21(b), Figure 22(b) is a longitudinal cross-section of the tunnel after the thrust process of Figure 22(a), Figure 23(a) is a longitudinal cross-section of the tunnel after the thrust process of Figure 22(b), and Figure 23(b) is a longitudinal cross-section of the tunnel after the thrust process of Figure 23(a).

[0124] By repeating the pushing process described in Figures 17 to 21, when the LED hose light LE3 is fully extended, as shown in Figure 22(a), the LED hose light LE3 shown in Figure 17(b) is additionally carried into the tunnel entrance Tm side and electrically connected to the LED hose light LE3 in the existing rearmost pushing pipe PP, as shown in Figure 22(b).

[0125] During this time, communication is performed between the communication equipment Ct on the face side and the communication equipment Cm on the minehead side, for example, by contacting each other through the power line PL1 of the communication facility S1, and transmitting images taken by the camera CS (see Figure 14, etc.) of the communication equipment Ct on the face side to the communication equipment Cm on the minehead side through the power line PL1.

[0126] 23(a), the face Tf in the cutting edge pipe CP is excavated manually or by an excavator, and when the excavation has progressed to the axial length of the thrust pipe PP, the power line PL1 is disconnected from the power source P at the wellhead Tm side in the same manner as above, and is retracted while wound inside the rearmost thrust pipe PP. In addition, although not shown, the newly connected LED hose light LE3 is retracted while wound inside the rearmost thrust pipe PP.

[0127] After that, as shown in FIG. 23(b), after inserting the thrust pipe PP into the shaft VH, the tip face of the thrust pipe PP inserted into the shaft VH is aligned with the rear end face of the existing rearmost thrust pipe PP in the same manner as above. Then, the LED hose light LE3 is installed in the thrust pipe PP in the shaft VH. Also, the power line PL1 in the rearmost thrust pipe PP is extended to the mouth Tm side through the thrust pipe PP in the shaft VH and electrically connected to the power source P. This allows communication between the communication devices Cm and Ct, for example, by transmitting an image taken by the camera CS (see FIG. 14, etc.) of the communication device Ct on the face side to the communication device Cm on the mouth side through the power line PL1. Note that after the tip face of the added thrust pipe PP is aligned with the rear end face of the existing rearmost thrust pipe PP, the additional LED hose light LE3 may be carried into the shaft VH and electrically connected to the LED hose light LE3 in the existing rearmost thrust pipe PP.

[0128] Next, Figure 24 is a longitudinal cross-sectional view of the tunnel after the thrust process of Figure 23(b), Figure 25(a) is a longitudinal cross-sectional view of the tunnel after the thrust process of Figure 24, and Figure 25(b) is a longitudinal cross-sectional view of the tunnel after the thrust process of Figure 25(a).

[0129] As shown in Fig. 24, in the same manner as above, the thrust pipe PP in the shaft VH is pushed into the ground from the side of the shaft VH. During this time, communication is performed between the communication devices Cm and Ct, for example, by transmitting images taken by the camera CS (see Fig. 14, etc.) of the communication device Ct on the face side to the communication device Cm on the tunnel mouth side via the power line PL1.

[0130] Next, by repeating the propulsion process described with reference to Figures 17 to 21, when the power line PL1 is fully extended as shown in Figure 25(a), the power line PL1 shown in Figure 17(c) is additionally brought into the tunnel entrance side and, as shown in Figure 25(b), is electrically connected to the power source P and electrically connected to the power line PL1 in the rearmost propulsion pipe PP.

[0131] 22, an LED hose light LE3 is additionally carried to the wellhead Tm side and electrically connected to the LED hose light LE3 in the existing rearmost thrust pipe PP. In this manner, in this embodiment, the total length (unit length) of the power line PL1 is set to twice (an integer multiple) the total length (unit length) of the LED hose light LE3, so that when the power line PL1 is added, the LED hose light LE3 can also be added, simplifying the work of adding the power line PL1 and the LED hose light LE3.

[0132] During this time, communication can be performed between the communication equipment Ct on the face side and the communication equipment Cm on the minehead side, for example, by contacting each other through the power line PL1 of the communication facility S1, or by transmitting images taken by the camera CS (see Figure 14, etc.) of the communication equipment Ct on the face side to the communication equipment Cm on the minehead side through the power line PL1.

[0133] In this manner, a plurality of thrust pipes are pushed into the ground along the outer periphery of the tunnel, a box-shaped roof is formed using the thrust pipes, and then the tunnel is constructed by replacing the box-shaped roof with a box-shaped tunnel structure.

[0134] In this embodiment, when a tunnel is excavated by tunnel jacking, communication can be performed between the communication device Cm on the tunnel mouth Tm side and the communication device Ct on the tunnel face Tf side through the power line PL1 installed in the tunnel. This eliminates the need to lay a LAN cable for communication, and the total number of wiring can be reduced. Therefore, even in cases where the wiring needs to be detached every time a tunnel pipe PP is added, such as in tunnel jacking, the effort of detaching and attaching the wiring can be reduced.

[0135] In particular, in the case of long-distance R&C construction or large-section R&C construction, the number of jacking pipes is large, so if the total number of wiring is large, the number of wiring connections and disconnections increases. Also, in the case of large-section R&C construction, construction is carried out simultaneously on multiple jacking pipes (faces), so if the total number of wiring is large, the work becomes extremely cumbersome. In contrast, in this embodiment, it is possible to eliminate the LAN cable for communication and reduce the total number of wiring, which greatly reduces the effort of connecting and disconnecting wiring. Therefore, the work of jacking construction can be greatly simplified.

[0136] In addition, because the highly durable power line PL1 is used as the communication line, the wiring will not be physically damaged even in harsh environments or during construction work that requires frequent disconnection of the wiring, and communication interruptions caused by wiring damage can be prevented.

[0137] In addition, the LED hose light LE3, which would interfere with communication between the communication devices Cm, Ct, is not connected to the power line PL1 between the communication devices Cm, Ct, but is instead electrically connected together with the power line PL2 branching off from the power line PL1 at a position away from the communication devices Cm, Ct. This reduces the effect of noise from the LED hose light LE3 on the power line PL1, and therefore improves the stability of communication between the communication devices Cm and Ct inside and outside the tunnel, even when the power line PL1 is used as a communication line during tunneling work.

[0138] (Third embodiment)

[0139] FIG. 26 is a configuration diagram of an example of a PLC communication facility according to the third embodiment of the present invention.

[0140] In the above second embodiment, a case has been exemplified in which no load such as lighting is connected to the power line PL1 between the communication devices Cm and Ct.

[0141] In contrast to this, in the PLC communication facility S3 of the present embodiment, a light such as one emergency light EL is electrically connected to the power line PL1 between the communication devices Cm and Ct. Even in this case, communication between the communication devices Cm and Ct can be performed using the power line PL1 as a communication line. However, for example, up to two or three emergency lights EL can be connected. The rest is the same as in the second embodiment.

[0142] (Fourth embodiment)

[0143] FIG. 27 is a configuration diagram of an example of a PLC communication facility according to the fourth embodiment of the present invention.

[0144] In the above-described second embodiment, the case where the power line PL2 of the LED hose light LE3 is electrically connected to the plug connection portion PiC at the end of the power line PL1 on the face Tf side has been illustrated.

[0145] In response to this In the PLC communication facility S4 of this embodiment, even when the power line PL2 of the LED hose light LE3 is electrically connected to the plug connection part PiC between the end of the power line PL1 on the wellhead Tm side and the end of the face Tf side, communication between the communication devices Cm and Ct can be performed using the power line PL1 as a communication line. Other than this, it is the same as the second embodiment.

[0146] The invention made by the inventor has been specifically described above based on the embodiment, but the embodiment disclosed in this specification is illustrative in all respects and is not limited to the disclosed technology. In other words, the technical scope of the present invention should not be interpreted restrictively based on the description in the above embodiment, but should be interpreted strictly according to the description in the claims, and includes technologies equivalent to the described technologies in the claims and all modifications that do not deviate from the gist of the claims.

[0147] For example, in the above first to fourth embodiments, a noise filter is used to block noise from the load to the power line, but this is not limited to this. For example, a noise canceller may be used that eliminates generated noise by interfering with an antiphase of the generated noise.

[0148] In addition, in the first to fourth embodiments, the load is exemplified as a lighting means, but the load is not limited to this, and other devices such as tools can also be exemplified as the load. In this case, the other devices such as tools are electrically connected to the power line PL2.

[0149] In addition, in explaining the jacking method of the second embodiment, the LED hose light LE3 is used as the lighting means, but the present invention is not limited to this, and for example, a plurality of individual fluorescent lamps FL or an individual LED light may be used as the lighting means and electrically connected to the power line PL2. In this case, the power line PL2 to which the plurality of individual fluorescent lamps FL or LED lights are electrically connected is wound and brought into the jacking pipe PP.

[0150] In addition, in the above second embodiment, a case where it is applied to the R&C method is described, but it is not limited to this, and it can also be applied, for example, to a jacking method in which a tunnel is constructed using the jacking pipe itself.

[0151] In addition, in the above first to third embodiments, a case has been described in which a vertical shaft is provided and the thrust pipe is pushed in from its inner side, but this is not limited to this and the present invention can also be applied to a case in which the thrust pipe is pushed in from the side of the convex portion without providing a vertical shaft.

[0152] In addition, in the above first to third embodiments, the first power line and the second power line are described as being composed of a plurality of power lines. However, this is not limited to this, and for example, the first power line, the second power line, or the first power line and the second power line may be composed of a single power line.

[0153] In addition, in the above first to third embodiments, the multiple power lines constituting the first power line have the same length. However, this is not limited to this, and for example, the multiple power lines constituting the first power line may have different lengths.

[0154] In addition, in the above third embodiment, the case where the lengths of the multiple power lines constituting the second power line are the same has been described. However, this is not limited to this, and for example, the lengths of the multiple power lines constituting the second power line may differ. [Industrial Applicability]

[0155] The above explanation shows the case where the PLC communication equipment of the present invention is applied to a tunnel formed by a tunneling method, but the present invention is not limited to this and can be applied in various ways, for example, to other locations such as a tunnel formed by a shield machine or an underground parking lot. [Explanation of symbols]

[0156] S1~S4 PLC communication equipment P power supply PL1 Power Line (First Power Line) PL2 Power Line (Second Power Line) PLn1,PLn2 Power line PiC plug connector Mm PLC modem (first PLC means) Mt PLC modem (second PLC means) Cm Communication equipment (first means of communication) Ct Communication device (second means of communication) PC Personal computer for measurement TB Tablet MC Microphone SBC Single Board Computer CS Camera SP Speaker LD load FL Fluorescent lamp (load, lighting means) LE3 LED hose light (load, lighting means) NF Noise Filter TN pit Tm wellhead Tf Face VH shaft CP cutting pipe (excavator) PP propulsion tube EL emergency light

Claims

1. Power supply, a first power line electrically connected to the power source; a first communication means electrically connected to the first power line; a first PLC means electrically connected between the first power line and the first communication means, and allowing the first power line to be used as a communication line; a second communication means electrically connected to the first power line at a position remote from the first communication means; a second PLC means electrically connected between the first power line and the second communication means, and allowing the first power line to be used as a communication line; a second power line branched off from the first power line in a state electrically connected to the first power line; a load electrically connected to the second power line; A communication facility comprising:

2. 2. The communication facility according to claim 1, wherein at least one of the first power line and the second power line is composed of a single power line or a plurality of power lines connected in series.

3. 2. The communication facility according to claim 1, wherein the load is a lighting device.

4. 4. The communication facility according to claim 3, wherein the illumination means is an LED hose light having a plurality of LEDs arranged in a line and configured to be handled as a single unit.

5. 5. The communication facility according to claim 4, wherein the LED hose light is composed of one LED hose light or a plurality of LED hose lights connected in series via the second power line.

6. the first power line is configured by connecting a plurality of power lines having a predetermined first unit length in series, The LED hose light is configured by connecting a plurality of LED hose lights having a predetermined second unit length in series through the second power line, 5. The communication facility according to claim 4, wherein the first unit length is an integer multiple of the second unit length.

7. 4. The communication facility according to claim 3, wherein the illumination means comprises a plurality of LED lights.

8. 4. The communication facility according to claim 3, wherein said lighting means comprises a plurality of fluorescent lamps.

9. The communication equipment according to any one of claims 1 to 8, characterized in that a noise filter is electrically connected between a branch portion of the first power line and the second power line and the load.

10. The communication equipment according to any one of claims 1 to 8, characterized in that the line length between the branch point of the first power line and the second power line and the load is equal to or longer than a predetermined length.

11. 11. The communication equipment according to claim 10, wherein the predetermined length is 2 m.

12. The first communication means and the first PLC means are installed outside a tunnel constructed by tunneling work, the second communication means and the second PLC means are installed around the face of the tunnel, and the first power line and the second power line are installed inside the tunnel. The first communication means and the second communication means are configured to communicate with each other, and the first power line is disconnected from the power source prior to installing a tunnel thrust pipe at the tunnel mouth, and the first power line is electrically connected to the power source in a detachable state after the tunnel thrust pipe is installed at the tunnel mouth. The communication equipment according to any one of claims 1 to 8, characterized in that

13. 13. The communication facility according to claim 12, further comprising a noise filter electrically connected between the load and a branch point of the first power line and the second power line.

14. 13. The communication facility according to claim 12, wherein a line length between a branch point of the first power line and the second power line and the load is equal to or longer than a predetermined length.

15. 15. The communications equipment according to claim 14, wherein the predetermined length is 2 m.

Images