Method of switching electric car track in tunnel made of iron-based metal catenary wire

Abstract

To provide a simple method for switching from a compound catenary system to a simple catenary system electric car line.SOLUTION: In a first process, the contact wire Tr is re-stretched to a contact wire Tr2, and anchored to a yoke Yk2 by 2. 0t. In a second process, the overhead wire support fitting Sp is attached to the movable bracket 102. In a third process, the contact wire Tr2 is suspended by the temporary hanger Thg, and the auxiliary catenary wire Ax is hung on the wire support fitting Sp and connected to the contact wire Tr2 by a connector Co. In a fourth process, a new auxiliary catenary wire Ax2 is extended while the auxiliary catenary wire Ax is pulled out, and the new auxiliary catenary wire Tr2 is connected to the contact wire Co2 by a connector joint. In a fifth process, the contact wire Ax2 is hung on the auxiliary catenary Hg2 through the hanger Tr2, and after the catenary Ax2 is formed as the catenary Me2, this and the contact wire Tr2 are connected by the connector Co3, and the catenary Me and the hanger Thg are removed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a simplified construction method for converting a compound catenary type of tunnel electric railroad track, in which a contact wire is suspended via an auxiliary catenary below a catenary wire, to a simple catenary type, in which the contact wire is suspended directly below the catenary wire. [Background technology]

[0002] In recent years, in order to reduce maintenance labor and costs, progress has been made in simplifying the system on the Tokaido Shinkansen, Tohoku Shinkansen, and other lines from the compound catenary system to the simple catenary system. For example, as shown in Figure 18, the existing electric train line A of the Tokaido Shinkansen is a compound catenary type overhead line in which an iron-based metal catenary wire Me is supported on movable brackets 102 supported by lower beams 101, an auxiliary copper-based metal catenary wire Ax is suspended from this by droppers Dp, and a bronze contact wire Tr is suspended from this by hangers Hg, and the same is true inside tunnels. The construction work to replace such an existing overhead contact line A with a new overhead contact line B using a simple catenary system in which the contact wire Tr is suspended directly by hangers Hg below the copper-based metal catenary wire Me is generally carried out using a method known as the side overhead contact line method, in which the new overhead contact line B is installed next to the existing overhead contact line A and then the two are replaced. When the side overhead contact method is used, additional equipment such as temporary bracing and guy wires for the parallel overhead contact wires will be required to withstand the load of the parallel new electric train line B. In the so-called open sections outside the tunnel, construction can be carried out by installing bracing members and temporary guy wires using the bottom of existing supports such as utility poles. However, due to limitations on the strength of the tunnel lining, it is not possible to apply any greater load (mainly tensile force) to the existing supports within the tunnel than is currently the case. This is a major constraint on the progress of construction. [Prior art documents] [Patent documents]

[0003] [Non-Patent Document 1] "Railway and Electrical Technology" Vol. 35 No. 5 P. 39-44 "Shinkansen Electrical Track Simplification Work Initiative" Japan Railway Electrical Engineering Association, May 2024 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a construction method that can efficiently and quickly convert an overhead contact line from a compound catenary system to a simple catenary system, without installing an additional overhead contact line or applying a tensile force that exceeds the combined force of the three existing overhead contact lines (messenger line (Me), auxiliary messenger line (Ax), and trolley wire (Tr)). [Means for solving the problem]

[0005] In the following description, reference will be made to the reference numerals in the accompanying drawings, but the present invention is not limited thereto. In order to solve the above problem, the construction method of the present invention involves suspending an existing auxiliary catenary wire Ax made of copper-based metal stranded wire via an existing dropper Dp below an existing catenary wire Me made of iron-based metal stranded wire supported on a movable bracket 102, and an existing contact wire Tr is suspended below that via an existing hanger Hg, and the existing catenary wire Me is held down with a tension of 2.0 t at the first connection part P1 of the first yoke Yk1 of the tension balancer TTB with a tension of 5.5 t, and the existing auxiliary catenary wire Ax is held down with a tension of 2.0 t at the first connection part P1 of the first yoke Yk1 of the tension balancer TTB with a tension of 5.5 t. This is a construction method for converting a compound catenary type contact line in a tunnel, in which the existing contact wire Tr is held by the third holding part P3 of the second yoke Yk2 connected to the holding part P2 with a tension of 1.5 tons, and the existing contact wire Tr is held by the fourth holding part P4 of the second yoke Yk2 with a tension of 2.0 tons, to a simple catenary type contact line in which a new, higher-strength contact wire Tr2 is suspended via a new hanger Hg2 below a new messenger wire Me2 made of copper-based metal stranded wire, and in which the existing contact wire Tr is replaced by the new, higher-strength contact wire Tr2 at a first train interval. The first step involves replacing the new contact wire Tr2 and securing it at the fourth retaining section with a tension of 2.5 tons, allowing trains to run. The second step involves moving the existing catenary wire Me on the movable bracket 102 to the side at the second train interval and attaching the catenary support bracket Sp above the new contact wire Tr2. The third step involves replacing the new contact wire Tr2 with the existing catenary wire Me via the temporary hanger Thg, removing the existing hanger Hg and the existing dropper Dp, and securing the existing auxiliary catenary wire Ax to the catenary support bracket. In the third step, a separator Se is inserted between the existing auxiliary catenary wire Ax and the existing catenary wire Me to ensure separation, and a connector Co is inserted between the existing auxiliary catenary wire Ax and the new contact wire Tr2 to establish electrical continuity, allowing trains to run. In the fourth train interval, the new auxiliary catenary wire Ax2 is connected to the existing auxiliary catenary wire Ax supported by the catenary wire support bracket Sp, and while winding up the existing auxiliary catenary wire Ax, the new auxiliary catenary wire Ax2 is extended so that it can be pulled out and attached to the third retention part P3.The fourth step is to hold the auxiliary catenary wire Ax2 in place with a tension of 5 tons, and if necessary, to install a separator Se between the auxiliary catenary wire Ax2 and the existing catenary wire Me to ensure separation, and to install a connector Co between the new auxiliary catenary wire Ax2 and the new contact wire Tr2 to electrically connect them, allowing trains to run. In the fifth train interval, the new contact wire Tr2 is resuspended on the new auxiliary catenary wire Ax2 via a new hanger Hg2. After the new auxiliary messenger wire Ax2 has been converted into the new messenger wire Me2 by the above steps, the existing messenger wire Me and temporary hanger Thg are removed, and the new messenger wire Me2 is fastened to the first fastening part P1 with a tension of 3.0 t, and the new contact wire Tr2 is fastened to the second fastening part P2 with a tension of 2.5 t, or, if necessary, the tension of the tension balancer is adjusted to 5.0 t, thereby changing the tension of the new messenger wire to 2.5 t. [Effects of the Invention]

[0006] According to the present invention, construction to simplify the overhead contact lines in a tunnel from a compound catenary system to a simple catenary system can be carried out efficiently in a short period of time without installing any additional overhead contact lines or applying a tensile force greater than the combined force of the three existing overhead contact lines (messenger line (Me), auxiliary messenger line (Ax), and trolley wire (Tr)). [Brief explanation of the drawings]

[0007] [Figure 1] 1A and 1B show an existing electric rail in a tunnel according to a first embodiment of the construction method of the present invention, in which FIG. 1A is an explanatory diagram showing the electric rail from the front, and FIG. 1B is an explanatory diagram showing the retaining portion of the electric rail from the side. [Figure 2] 1A and 1B show the first step in a first embodiment of the construction method of the present invention, in which FIG. 1A is an explanatory diagram showing the contact line from the front, and FIG. 1B is an explanatory diagram showing the contact line's retaining portion from the side. [Figure 3] FIG. 10 is an explanatory front view of the trolley track illustrating a second step in the first embodiment of the construction method of the present invention. [Figure 4]FIG. 10 is an explanatory diagram showing a third step in the first embodiment of the construction method of the present invention, as viewed from the front of the train track. [Figure 5] 1A and 1B show the fourth step in the first embodiment of the construction method of the present invention, in which (a) is an explanatory diagram showing the contact line from the front, and (b) is an explanatory diagram showing the retaining portion of the contact line from the side. [Figure 6] 1A and 1B show the fifth step in the first embodiment of the construction method of the present invention, in which FIG. 1A is an explanatory diagram showing the contact line from the front, and FIG. 1B is an explanatory diagram showing the contact line retaining portion from the side. [Figure 7] 10A and 10B show an existing electric rail in a tunnel according to a second embodiment of the construction method of the present invention, in which FIG. 10A is an explanatory diagram showing the electric rail from the front, and FIG. 10B is an explanatory diagram showing the retaining portion of the electric rail from the side. [Figure 8] 10A and 10B show the first step in a second embodiment of the construction method of the present invention, in which FIG. 10A is an explanatory diagram showing the contact line from the front, and FIG. 10B is an explanatory diagram showing the contact line's retaining portion from the side. [Figure 9] FIG. 10 is an explanatory front view of the trolley track illustrating a second step in the second embodiment of the construction method of the present invention. [Figure 10] FIG. 10 is an explanatory front view of the trolley track showing a third step in the second embodiment of the construction method of the present invention. [Figure 11] 10A and 10B show the fourth step in the second embodiment of the construction method of the present invention, where FIG. 10A is an explanatory diagram showing the contact line from the front, and FIG. 10B is an explanatory diagram showing the contact line's retaining portion from the side. [Figure 12] 10A and 10B show the fifth step in the second embodiment of the construction method of the present invention, in which FIG. 10A is an explanatory diagram showing the contact line from the front, and FIG. 10B is an explanatory diagram showing the contact line retaining portion from the side. [Figure 13] 1A and 1B show the second step when a third embodiment of the construction method of the present invention is applied to the existing electric rail in the tunnel of FIG. 1, where (a) is an explanatory diagram showing the electric rail from the front, and (b) is an explanatory diagram showing the retaining portion of the electric rail from the side. [Figure 14] FIG. 10 is an explanatory diagram showing a front view of the trolley track, illustrating the third step in the third and fourth embodiments of the construction method of the present invention. [Figure 15] FIG. 10 is an explanatory diagram showing a fourth step in the third and fourth embodiments of the construction method of the present invention, as viewed from the front of the train track. [Figure 16] FIG. 10 is an explanatory diagram showing a fifth step in the third and fourth embodiments of the construction method of the present invention, as viewed from the front of the train track. [Figure 17] 10A and 10B show the sixth step in the third and fourth embodiments of the construction method of the present invention, where FIG. 10A is an explanatory diagram showing the contact line from the front, and FIG. 10B is an explanatory diagram showing the contact line retaining portion from the side. [Figure 18] This is an explanatory diagram showing a construction method for converting a conventional compound catenary type contact line to a simple catenary type contact line, as seen from the front. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. [Example]

[0009] The first embodiment is an embodiment in which the existing compound catenary type contact line in the tunnel shown in FIG. 1 is switched to a simple catenary type contact line using five train intervals.

[0010] In FIG. 1(a), 101 is a lower beam supported on the top of the tunnel, and a movable bracket 102 is supported on this lower beam 101. A 180 mm 2 The existing catenary wire Me, made of iron-based metal stranded wire, is supported with a tension of 2.0t, and below it, an existing dropper Dp is installed 150mm 2 The existing auxiliary catenary wire Ax, which is made of copper-based metal stranded wire, is suspended with a tension of 1.5t, and below it, the existing contact wire Tr is suspended with a tension of 2.0t via the existing hanger Hg.

[0011] As shown in Figure 1(b), the existing catenary wire Me is held in place at the retaining portion P1 of the yoke Yk1 with a tension of 2.0t by a tunnel tension balancer TTB (tension 5.5t) supported at the top of the tunnel, the existing auxiliary catenary wire Ax is held in place at the retaining portion P3 of the yoke Yk2 with a tension of 1.5t via the retaining portion P2 of the yoke Yk1, and the existing trolley wire Tr is held in place at the retaining portion P4 of the yoke Yk2 with a tension of 2.0t.

[0012] The following describes the process of converting the above-mentioned contact line into a contact line of the simple catenary type using five train intervals.

[0013] In the first step at the first train interval, as shown in Figure 2(a), the existing trolley wire Tr is removed and a new, higher strength trolley wire Tr2 is hung under the existing hanger Hg, and as shown in Figure 2(b), it is held in place by the retaining portion P4 of the yoke Yk2 with a tension of 2.0t, allowing the train to run.

[0014] In the second step at the second train interval, as shown in Figure 3, the existing catenary wire Me on the movable bracket 102 is moved to the side, and the catenary support bracket Sp is attached to the movable bracket 102 above the new contact wire Tr2.

[0015] In the third step at the third train interval, as shown in Figure 4, the existing dropper Dp and existing hanger Hg are removed, and the new contact wire Tr2 is resuspended using the temporary hanger Thg. At the same time, the existing auxiliary catenary wire Ax is hooked onto the catenary support bracket Sp via the movable bracket 102, and connected to the new contact wire Tr2 with a connector Co, allowing the train to run.

[0016] In the fourth step at the fourth train interval, as shown in Fig. 5, the existing auxiliary catenary wire Ax on the catenary support bracket Sp is pulled out, and the new auxiliary catenary wire Ax2 (cross-sectional area 200 mm) is installed on the catenary support bracket Sp. 2 The newly installed auxiliary catenary wire Ax2 and the newly installed trolley wire Tr2 are connected with connector Co2, allowing trains to run.

[0017] In the fifth step for the fifth train interval, as shown in Fig. 6(a), the new contact wire Tr2 is resuspended from the new auxiliary catenary wire Ax2 via the new hanger Hg2, and the new auxiliary catenary wire Ax2 becomes the new catenary wire Me2. After that, the existing catenary wire Me and temporary hanger Thg are removed, and the new catenary wire Me2 and the new contact wire Tr2 are connected with the connector Co3. As shown in Fig. 6(b), the new catenary wire Me2 is fastened to the fastening part P1 of the yoke Yk1 with a tension of 3.0 t, and the new contact wire Tr2 is fastened to the fastening part P2 of the yoke Yk1 with a tension of 2.5 t. Alternatively, if necessary, the tension of the tension balance is adjusted to 5.0 t using a jig, and the tension of the new catenary wire Me2 is changed to 2.5 t.

[0018] Through the above steps, it is possible to easily switch to a simple catenary type contact line without adding an additional parallel line or applying a tensile force that exceeds the total tension of the existing contact lines. [Example]

[0019] The second embodiment is an embodiment in which an existing compound catenary type contact line in a tunnel shown in FIG. 7 is replaced with a simple catenary type contact line using five train intervals.

[0020] In Fig. 7(a), a movable bracket 102 is supported on a lower beam 101 in a tunnel. 2 The existing catenary wire Me, made of iron-based metal stranded wire, is supported with a tension of 2.5t, and below it, an existing dropper Dp is installed 150mm 2 The existing auxiliary catenary wire Ax, which is made of copper-based metal stranded wire, is suspended with a tension of 1.0t, and below it, the existing contact wire Tr is suspended with a tension of 2.0t via the existing hanger Hg.

[0021] As shown in Figure 7(b), the existing catenary wire Me is held in place at the retaining portion P1 of the yoke Yk1 with a tension of 2.5t by a tunnel tension balancer TTB (tension 5.5t) supported at the top of the tunnel, the existing auxiliary catenary wire Ax is held in place at the retaining portion P3 of the yoke Yk2 with a tension of 1.0t via the retaining portion P2 of the yoke Yk1, and the existing trolley wire Tr is held in place at the retaining portion P4 of the yoke Yk2 with a tension of 2.0t.

[0022] The following describes the process of converting the above-mentioned contact line into a contact line of the simple catenary type using five train intervals.

[0023] In the first step at the first train interval, as shown in Fig. 8(a), the existing contact wire Tr is removed and a new contact wire Tr2 (copper-based metal 170 mm thick) with higher strength is installed. 2 A tension of 2.0 t) is suspended from the existing hanger Hg and, as shown in FIG. 8(b), is fastened to the fastening portion P4 of the yoke Yk2 with a tension of 2.0 t.

[0024] In the second step at the second train interval, as shown in Figure 9, the existing catenary wire Me on the movable bracket 102 is moved to the side, positioned above the new trolley wire Tr2, and the catenary support bracket Sp is attached to the movable bracket 102.

[0025] In the third step at the third train interval, as shown in Figure 10, the existing dropper Dp and existing hanger Hg are removed, and the new contact wire Tr2 is resuspended using the temporary hanger Thg. At the same time, the existing auxiliary catenary wire Ax is hooked onto the catenary support bracket Sp via the movable bracket 102, and connected to the new contact wire Tr2 with a connector Co, allowing the train to run.

[0026] In the fourth process at the fourth train interval, as shown in Fig. 11, the existing auxiliary catenary wire Ax on the catenary support bracket Sp is pulled out, while the new auxiliary catenary wire Ax2 (cross-sectional area 200 mm 2The newly installed auxiliary catenary wire Ax2 and the newly installed trolley wire Tr2 are connected with connector Co2, allowing trains to run.

[0027] In the fifth step for the fifth train interval, as shown in Fig. 12(a), the new contact wire Tr2 is resuspended from the new auxiliary catenary wire Ax2 via the new hanger Hg2, and the new auxiliary catenary wire Ax2 becomes the new catenary wire Me2. After that, the existing catenary wire Me and temporary hanger Thg are removed, and the new catenary wire Me2 and the new contact wire Tr2 are connected with the connector Co3. As shown in Fig. 12(b), the new catenary wire Me2 is held at the holding part P1 of the yoke Yk1 with a tension of 3.2 t, and the new contact wire Tr2 is held at the holding part P2 of the yoke Yk1 with a tension of 2.3 t, which is increased. [Example]

[0028] The third embodiment is an embodiment in which the existing compound catenary type contact line in the tunnel shown in Figure 1 is replaced with a simple catenary type contact line using six train intervals.

[0029] The first step performed in the first train gap in the third embodiment is the same as the first step in the first embodiment shown in FIG. 2, and therefore a description thereof will be omitted.

[0030] In the second step at the second train spacing, as shown in Figure 13, the existing catenary wire Me on the movable bracket 102 is moved from above the new trolley wire Tr2 to the side, and an overhead catenary support bracket Sp is attached to the movable bracket 102 above the new trolley wire Tr2, and an auxiliary catenary wire support bracket Sp2 is attached to the side of the overhead catenary support bracket Sp and has a support portion below the movable bracket 102.

[0031] In the third step at the third train interval, as shown in Figure 14, a new contact wire Tr2 is resuspended from the existing catenary wire Me via a temporary hanger Thg, the existing hanger Hg and the existing dropper Dp are removed, the existing auxiliary catenary wire Ax is hooked onto the auxiliary catenary wire support bracket Sp2 below the movable bracket 102, and a connector Co is inserted between the existing auxiliary catenary wire Ax and the new contact wire Tr2 to establish electrical continuity, allowing the train to run.

[0032] In the fourth step at the fourth train interval, as shown in FIG. 15, the existing auxiliary catenary wire Ax is moved onto the movable bracket 102 and supported by the catenary wire support bracket Sp, the auxiliary catenary wire support bracket Sp2 is removed, a separator Se is interposed between the existing auxiliary catenary wire Ax and the existing catenary wire Me as necessary to ensure separation, and a connector Co2 is interposed between the existing auxiliary catenary wire Ax and the new contact wire Tr2 to establish electrical continuity and enable the train to run.

[0033] In the fifth step at the fifth train interval, as shown in Figure 16, while the existing auxiliary catenary wire Ax supported by the catenary support bracket Sp is pulled out, a new auxiliary catenary wire Ax2 is extended over the catenary support bracket Sp and held down with a tension of 1.5 tons at the third retaining part P3 shown in Figure 5(b). If necessary, a separator Se is interposed between the new auxiliary catenary wire Ax2 and the existing catenary wire Me to ensure separation, and a connector Co2 is interposed between the new auxiliary catenary wire Ax2 and the new contact wire Tr2 to establish electrical continuity and enable the train to run.

[0034] In the sixth step for the sixth train interval, as shown in Fig. 17, the new contact wire Tr2 is resuspended on the new auxiliary catenary wire Ax2 via the new hanger Hg2, and the new auxiliary catenary wire Ax2 becomes the new catenary wire Me2. After that, the existing catenary wire Me and the temporary hanger Thg are removed, and as shown in Fig. 6(b), the new catenary wire Me2 is fastened to the first fastening part P1 with a tension of 3.0 t, and the new contact wire Tr2 is fastened to the second fastening part P2 with a tension of 2.5 t. Alternatively, if necessary, the tension of the tension balancer TTB is adjusted to 5.0 t using a jig, and the tension of the new catenary wire Me2 is changed to 2.5 t, completing the changeover of the overhead contact lines. [Example]

[0035] The fourth embodiment is an embodiment in which the existing compound catenary type contact line in the tunnel shown in FIG. 7 is replaced with a simple catenary type contact line using six train intervals.

[0036] The first step performed in the first train gap in the fourth embodiment is the same as the first step in the second embodiment shown in FIG. 8, and therefore a description thereof will be omitted.

[0037] The second step at the second train interval is the same as the second step of Example 3 shown in Figure 13, in which the existing catenary wire Me on the movable bracket 102 is moved from above the new trolley wire Tr2 to the side, and an overhead catenary support bracket Sp is attached to the movable bracket 102 above the new trolley wire Tr2, and an auxiliary catenary wire support bracket Sp2 is attached to the side of the overhead catenary support bracket Sp and has a support portion below the movable bracket 102.

[0038] The second step at the third train interval is the same as the third step of Example 3 shown in Figure 14, in which a new contact wire Tr2 is resuspended from the existing catenary wire Me via a temporary hanger Thg, the existing hanger Hg and the existing dropper Dp are removed, the existing auxiliary catenary wire Ax is hung on the auxiliary catenary wire support bracket Sp2 below the movable bracket 102, and a new connector Co is inserted between the existing auxiliary catenary wire Ax and the new contact wire Tr2 to establish electrical continuity, allowing the train to run.

[0039] The fourth step at the fourth train interval is the same as the fourth step of the third embodiment shown in FIG. 15, in which the existing auxiliary catenary wire Ax is moved onto the movable bracket 102 and supported by the catenary wire support bracket Sp, the auxiliary catenary wire support bracket Sp2 is removed, a separator Se is interposed between the existing auxiliary catenary wire Ax and the existing catenary wire Me as necessary to ensure separation, and a connector Co2 is interposed between the existing auxiliary catenary wire Ax and the new contact wire Tr2 to establish electrical continuity and enable the train to run.

[0040] The fifth step at the fifth train interval is the same as the fifth step of the third embodiment shown in Figure 16. While the existing auxiliary catenary Ax supported by the catenary support bracket Sp is pulled out, a new auxiliary catenary Ax2 is extended over the catenary support bracket Sp and held down with a tension of 1.0 t at the third retaining part P3 shown in Figure 11(b). If necessary, a separator Se is interposed between the new auxiliary catenary Ax2 and the existing catenary Me to ensure separation, and a connector Co2 is interposed between the new auxiliary catenary Ax2 and the new trolley wire Tr2 to establish electrical continuity and allow the train to run.

[0041] The sixth step for the sixth train gap is the same as the sixth step of Example 3 shown in Figure 17. The new contact wire Tr2 is resuspended on the new auxiliary catenary wire Ax2 via the new hanger Hg2, and the new auxiliary catenary wire Ax2 becomes the new catenary wire Me2. After that, the existing catenary wire Me and the temporary hanger Thg are removed, and as shown in Figure 12(b), the new catenary wire Me2 is fastened to the first retaining part P2 with a tension of 3.2 tons, and the new contact wire Tr2 is fastened to the second retaining part with a tension of 2.3 tons, thereby completing the switching of the overhead contact lines in the tunnel.

[0042] As described above, by using the methods of any of the embodiments, it is possible to easily switch to a simple catenary type contact line without adding an additional parallel line or applying a tensile force that exceeds the total tension of the existing contact lines. [Explanation of symbols]

[0043] Me Messenger Line Me2 Newly installed messenger line Dp Dropper Ax Auxiliary messenger wire Ax2 New auxiliary catenary Hg Hanger Hg2 New hangar Thg temporary hanger Tr contact wire Tr2 Newly installed contact wire TTB Tunnel Tension Balancer Yk1 First York P1 First retaining part P2 Second retaining part Yk2 Second York P3 Third retention part P4 Fourth retaining part Sp overhead line support bracket Sp2 Auxiliary catenary wire support bracket Co Connector Co2 Connector Co3 Connector Se separator 101 Lower bundle 102 Movable bracket

Claims

1. a construction method for converting a compound catenary type contact line in a tunnel into a simple catenary type contact line in which a new contact wire is suspended via a new hanger below a new catenary type contact line made of copper-based metal strand wire, the construction method comprising: an existing auxiliary catenary wire made of copper-based metal strand wire suspended via an existing dropper below an existing catenary wire made of iron-based metal strand wire supported on a movable bracket; an existing contact wire suspended below the existing auxiliary catenary wire via an existing hanger; the existing catenary wire being held by a first connection part of a first yoke of a tension balancer having a tension of 5.5 tons with a tension of 2.0 tons; the existing auxiliary catenary wire being held by a third retention part of a second yoke connected to a second retention part of the first yoke of the tension balancer with a tension of 1.5 tons; and the existing contact wire being held by a fourth retention part of the second yoke with a tension of 2.0 tons, a first step of replacing the existing contact wire with the new contact wire having a higher strength at a first train interval and securing the new contact wire at the fourth securing section with a tension of 2.0 tons to allow the train to run; a second step of laterally relocating the existing catenary wire on the movable bracket at a second train interval and attaching an overhead catenary support bracket above the newly installed contact wire; a third step of resuspending the new contact wire from the existing catenary wire via a temporary hanger at a third train interval, removing the existing hanger and the existing dropper, hanging the existing auxiliary catenary wire on the catenary wire support bracket, installing a separator between the existing auxiliary catenary wire and the existing catenary wire as necessary to ensure separation, and installing a connector between the existing auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling trains to run; a fourth step of connecting, at a fourth train interval, the end of the existing auxiliary catenary wire supported by the catenary wire support fitting to the tip of a new auxiliary catenary wire made of a larger-diameter copper-based metal stranded wire, drawing out and extending the new auxiliary catenary wire while winding up the existing auxiliary catenary wire, and holding it at the third holding section with a tension of 1.5 tons, interposing a separator between the new auxiliary catenary wire and the existing catenary wire to ensure separation as necessary, and interposing a connector between the new auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; and a fifth step of: at a fifth train interval, switching the new contact wire to the new auxiliary catenary wire via the new hanger and connector, thereby converting the new auxiliary catenary wire into the new catenary wire, and then removing the existing catenary wire and the temporary hanger, and fastening the new catenary wire to the first retaining section with a tension of 3.0 tons and the new contact wire to the second retaining section with a tension of 2.5 tons, or, as necessary, adjusting the tension of the tension balancer to 5.0 tons and changing the tension of the new catenary wire to 2.5 tons.

2. a construction method for converting a compound catenary type contact line in a tunnel into a simple catenary type contact line in which a new, higher-strength contact wire is suspended via a new hanger below a new catenary type contact line made of copper-based metal stranded wire, the method comprising: an existing auxiliary catenary wire made of copper-based metal stranded wire suspended via an existing dropper below an existing catenary wire made of iron-based metal stranded wire supported on a movable bracket; an existing contact wire suspended below the existing auxiliary catenary wire via an existing hanger; the existing catenary wire being held by a first connecting part of a first yoke of a tension balancer having a tension of 5.5 tons with a tension of 2.5 tons; the existing auxiliary catenary wire being held by a third retaining part of a second yoke connected to a second retaining part of the first yoke of the tension balancer with a tension of 1.0 tons; and the existing contact wire being held by a fourth retaining part of the second yoke with a tension of 2.0 tons, a first step of replacing the existing contact wire with a new contact wire having a higher strength at a first train interval and securing the new contact wire at the fourth securing section with a tension of 2.0 tons to allow the train to run; a second step of laterally relocating the existing catenary wire on the movable bracket at a second train interval and attaching an overhead catenary support bracket above the newly installed contact wire; a third step of resuspending the new contact wire from the existing catenary wire via a temporary hanger, removing the existing hanger and the existing dropper, hanging the existing auxiliary catenary wire on the catenary wire support bracket, installing a separator between the existing auxiliary catenary wire and the existing catenary wire as necessary to ensure separation, and installing a connector between the existing auxiliary catenary wire and the new contact wire to establish electrical continuity and enable train operation; a fourth step of connecting, at a fourth train interval, the end of the existing auxiliary catenary wire supported by the catenary wire support fitting to the tip of a new auxiliary catenary wire made of a larger-diameter copper-based metal stranded wire, drawing out and extending the new auxiliary catenary wire while winding up the existing auxiliary catenary wire, and fastening the new auxiliary catenary wire to the third fastening section with a tension of 1.0 t, interposing a separator between the new catenary wire and the existing catenary wire as necessary to ensure separation, and interposing a connector between the new catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; a fifth step of resuspending the new contact wire to the new auxiliary catenary wire via a new hanger and a connector at a fifth train interval, thereby converting the new auxiliary catenary wire into a new catenary wire, and then removing the existing catenary wire and the temporary hanger, and fastening the new catenary wire to the first retaining portion with a tension of 3.2 tons and the new contact wire to the second retaining portion with a tension of 2.3 tons.

3. a construction method for converting a compound catenary type contact line in a tunnel into a simple catenary type contact line in which a new, higher-strength contact wire is suspended via a new hanger below a new catenary type contact line made of copper-based metal stranded wire, the method comprising: an existing auxiliary catenary wire made of copper-based metal stranded wire suspended via an existing dropper below an existing catenary wire made of iron-based metal stranded wire supported on a movable bracket; an existing contact wire suspended below the existing auxiliary catenary wire via an existing hanger; the existing catenary wire being held by a first connection part of a first yoke of a tension balancer having a tension of 5.5 tons, the existing auxiliary catenary wire being held by a third holding part of a second yoke connected to a second holding part of the first yoke of the tension balancer with a tension of 1.5 tons, and the existing contact wire being held by a fourth holding part of the second yoke with a tension of 2.0 tons, a first step of replacing the existing contact wire with a new contact wire of higher strength at a first train interval and securing it at the fourth retaining portion with a tension of 2.0 tons to enable train operation; a second step of moving the existing catenary wire on the movable bracket from above the new contact wire to the side at a second train interval, attaching a catenary support bracket to the movable bracket above the new contact wire, and attaching an auxiliary catenary wire support bracket located to the side of the catenary support bracket and having a support portion below the movable bracket; a third step of resuspending the new contact wire from the existing catenary wire via a temporary hanger, removing the existing hanger and the existing dropper, hanging the existing auxiliary catenary wire on the auxiliary catenary wire support bracket below the movable bracket, and providing electrical continuity between the existing auxiliary catenary wire and the new contact wire by interposing a connector between them to allow trains to run; a fourth step of moving the existing auxiliary catenary wire onto the movable bracket and supporting it on the catenary wire support fitting at a fourth train interval, removing the auxiliary catenary wire support fitting, interposing a separator between the existing auxiliary catenary wire and the existing catenary wire as necessary to ensure separation, and interposing a connector between the existing auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; a fifth step of connecting, at a fifth train interval, the end of the existing auxiliary catenary wire supported by the catenary wire support fitting to the tip of a new auxiliary catenary wire made of a copper-based metal stranded wire with a larger diameter, and while winding up the existing auxiliary catenary wire, pulling out and extending the new auxiliary catenary wire and holding it at the third holding section with a tension of 1.5 tons, interposing a separator between the new auxiliary catenary wire and the existing catenary wire to ensure separation as necessary, and interposing a connector between the new auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; and a sixth step of resuspending the new contact wire to the new auxiliary catenary wire via a new hanger and a connector at a sixth train interval, thereby converting the new auxiliary catenary wire into a new catenary wire, and then removing the existing catenary wire and the temporary hanger, and fastening the new catenary wire to the first retaining section with a tension of 3.0 tons and the new contact wire to the second retaining section with a tension of 2.5 tons, or, as necessary, adjusting the tension of the tension balancer to 5.0 tons and changing the tension of the new catenary wire to 2.5 tons.

4. a compound catenary type contact line in a tunnel, in which an existing auxiliary catenary type contact line made of copper-based metal stranded wire is suspended via an existing dropper below an existing catenary type contact line made of iron-based metal stranded wire supported on a movable bracket, an existing contact wire is suspended below the existing auxiliary catenary type contact line via an existing hanger, the existing contact wire is held by a first connection part of a first yoke of a tension balancer having a tension of 5.5 tons with a tension of 2.5 tons, the existing auxiliary catenary type contact line is held by a third retention part of a second yoke connected to a second retention part of the first yoke of the tension balancer with a tension of 1.0 tons, and the existing contact wire is held by a fourth retention part of the second yoke with a tension of 2.0 tons, a first step of replacing the existing contact wire with a new contact wire of higher strength at a first train interval and securing it at the fourth retaining portion with a tension of 2.0 tons to enable train operation; a second step of moving the existing catenary wire on the movable bracket from above the new contact wire to the side at a second train interval, attaching a catenary wire support bracket to the movable bracket above the new contact wire, and attaching an auxiliary catenary wire support bracket located to the side of the catenary wire support bracket and having a support portion below the movable bracket; a third step of resuspending the new contact wire from the existing catenary wire via a temporary hanger, removing the existing hanger and the existing dropper, hanging the existing auxiliary catenary wire on the auxiliary catenary wire support bracket below the movable bracket, and providing electrical continuity between the existing auxiliary catenary wire and the new contact wire by interposing a connector between them to allow trains to run; a fourth step of moving the existing auxiliary catenary wire onto the movable bracket and supporting it on the catenary wire support fitting at a fourth train interval, removing the auxiliary catenary wire support fitting, interposing a separator between the existing auxiliary catenary wire and the existing catenary wire as necessary to ensure separation, and interposing a connector between the existing auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; a fifth step of connecting, at a fifth train interval, the end of the existing auxiliary catenary wire supported by the catenary wire support fitting to the tip of a new auxiliary catenary wire made of a copper-based metal stranded wire with a larger diameter, drawing out and extending the new auxiliary catenary wire while winding up the existing auxiliary catenary wire, and holding it at the third holding section with a tension of 1.0 t, interposing a separator between the new auxiliary catenary wire and the existing catenary wire to ensure separation as necessary, and interposing a connector between the new auxiliary catenary wire and the new contact wire to establish electrical continuity, thereby enabling the train to run; and a sixth step of resuspending the new contact wire to the new auxiliary catenary wire via a new hanger and a connector at a sixth train interval, thereby making the new auxiliary catenary wire a new catenary wire, and then removing the existing catenary wire and the temporary hanger, and fastening the new catenary wire to the first retaining portion with a tension of 3.2 tons and the new contact wire to the second retaining portion with a tension of 2.3 tons.

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