Method of changing over train line in tunnel made of copper-based metal stringing

Abstract

To provide a construction method capable of efficiently performing work for switching an electric car line in a tunnel from a compound catenary system to a simple catenary system in a short period of time without providing an additional overhead wire to an existing electric car line or applying a tensile force exceeding the existing electric car line.SOLUTION: In a first train interval, an overhead wire support metal fitting Sp is mounted on a movable bracket 102. In the second train interval, the hanger Hg is removed, the contact wire Tr is hung on the catenary wire Me at the hanger Hg2, the auxiliary catenary wire Ax is temporarily hung by the temporary hanging member Thg, the contact wire Tr is anchored to the anchor part P3 of the yoke Yk2 at the second 0t, and the auxiliary catenary wire Ax is anchored to the anchor part P4 of the yoke Yk2 at the first 5t. Between the trains, the dropper Dp is removed, the auxiliary catenary wire Ax is hooked on the wire support metal fitting Sp, the temporary hanging member Thg is removed, and the catenary wire Me and the trolley wire Tr are connected by a connector Co to be electrically conducted.SELECTED DRAWING: Figure 3

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 Shinkansen lines, starting with the Tokaido and Tohoku lines, from the compound catenary system to the simple catenary system. For example, as shown in Figure 9, the existing electric train line A in the Seikan Tunnel on the Hokkaido Shinkansen is a compound catenary type overhead line in which a copper-based metal catenary wire Me is supported on a movable bracket 102 supported by a lower beam 101, an auxiliary copper-based metal catenary wire Ax is suspended from this by a dropper Dp, and a bronze contact wire Tr is suspended from this by a hanger Hg. When construction work to replace 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 catenary wire Me is carried out in an open section outside a tunnel, a method known as the side overhead contact line method is used, 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] [Non-patent literature]

[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. The construction method of the present invention for solving the above-mentioned problems includes a first step of attaching a catenary support fitting Sp having a support portion below the movable bracket 102 on the side of the catenary wire Me at a first train interval to allow trains to pass, and a second step of attaching a new hanger Hg2 to the catenary wire Me at a second train interval, removing the hanger Hg, suspending the existing contact wire Tr with the hanger Hg2, and temporarily suspending the existing auxiliary catenary wire Ax suspended from the existing dropper Dp with a temporary suspending member Thg below the movable bracket 102, and also suspending the contact wire Tr and the auxiliary catenary wire Ax with a temporary suspending member Thg. The process includes a second step of switching the catenary wires, securing the trolley wire Tr to the retaining portion P3 of the yoke Yk2 with a tension of 2.0 tons to increase the tension for high-speed operation, and securing the auxiliary catenary wire Ax to the retaining portion P4 of the yoke Yk2 with a tension of 1.5 tons, thereby allowing trains to pass; a third step of removing the dropper Dp at the second train interval, hooking the auxiliary catenary wire Ax onto the catenary support bracket Sp, and removing the temporary suspension member Thg, thereby allowing trains to pass; and a fourth step of connecting the catenary wire Me and the trolley wire Tr with a connector Co at the second train interval to establish electrical continuity, thereby allowing trains to pass. [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] This shows an example of an existing electric railroad line inside a tunnel. (a) is an explanatory diagram of the electric railroad line seen from the front, and (b) is an explanatory diagram of the electric railroad line's retaining section seen from the side. [Figure 2] FIG. 1 is an explanatory front view of a train track illustrating a first step of the construction method of the present invention. [Figure 3]1A and 1B show the second step of the construction method of the present invention, where FIG. 1A is an explanatory diagram showing the electric rail as seen from the front, and FIG. 1B is an explanatory diagram showing the retaining portion of the electric rail as seen from the side. [Figure 4] FIG. 10 is an explanatory front view of the train track showing the third step of the construction method of the present invention. [Figure 5] FIG. 10 is an explanatory front view of the train track showing the fourth step of the construction method of the present invention. [Figure 6] FIG. 10 is an explanatory front view of the train track showing a fourth step in a construction method according to another embodiment of the present invention. [Figure 7] FIG. 10 is an explanatory front view of the train track showing a fifth step in a construction method according to another embodiment of the present invention. [Figure 8] FIG. 10 is an explanatory front view showing a state after the electric railroad tracks have been switched using a construction method according to another embodiment of the present invention. [Figure 9] FIG. 1 is an explanatory diagram showing an overview of the construction work to switch an existing compound catenary type overhead contact line outside a tunnel to a new simple catenary type overhead contact line. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of a compound catenary type overhead contact line in an existing tunnel. In FIG. 1(a), 101 is a lower beam supported at the top of the tunnel, and a movable bracket 102 is supported on this lower beam 101. A messenger wire Me (200 mm stranded wire made of copper-based metal) is mounted on the movable bracket 102. 2 Auxiliary catenary wire Ax (200mm copper-based stranded wire) is supported below it via a dropper Dp. 2 A trolley wire Tr (bronze wire 170 mm2, tension 1.5 t) is suspended below it via a hanger Hg.

[0009] As shown in Figure 1(b), the catenary wire Me is held in place at the retaining portion P1 of the first 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 auxiliary catenary wire Ax is held in place at the retaining portion P3 of the second yoke Yk2 with a tension of 2.0t via the retaining portion P2 of the yoke Yk1, and the trolley wire Tr is held in place at the retaining portion P4 of the yoke Yk2 with a tension of 1.5t.

[0010] The work to switch the above-mentioned compound catenary type contact line to a simple catenary type contact line will be carried out in four stages, with a total of two train intervals.

[0011] In the first step performed at the first train interval, as shown in Figure 2, an overhead line support bracket Sp having a support portion below the movable bracket 102 is attached to the side of the catenary wire Me on the movable bracket 102.

[0012] In the second process, which is carried out at the second train interval, as shown in Figure 3(a), a new hanger Hg2 is attached to the catenary wire Me, the existing hanger Hg is removed, and the existing contact wire Tr is suspended by the new hanger Hg2, while the auxiliary catenary wire Ax suspended from the dropper Dp is temporarily suspended by a temporary suspension member Thg below the movable bracket 102. Also, as shown in Figure 3(b), the retaining parts of the contact wire Tr and the auxiliary catenary wire Ax are swapped, and the contact wire Tr is secured to the retaining part P3 of the yoke Yk2 with 2.0 t to increase the tension for high speeds, and the auxiliary catenary wire Ax is secured to the retaining part P4 of the yoke Yk2 with 1.5 t.

[0013] In the third step, which is carried out at the second train interval, as shown in FIG. 4, the dropper Dp is removed, the auxiliary catenary wire Ax is hooked onto the catenary support fitting Sp, and the temporary suspension member Thg is removed.

[0014] In the fourth step, which is performed at the second train interval, as shown in Figure 5, if the distance between the auxiliary catenary wire Ax and the catenary wire Me supported by the catenary wire support bracket Sp is insufficient, a separator Se is inserted to provide a distance to prevent contact within the span, and the catenary wire Me and the contact wire Tr are connected with a connector Co to establish electrical continuity and allow trains to pass.

[0015] Through the above process, it is possible to easily switch to a simple catenary type overhead contact line without replacing the existing catenary wire Me or the existing contact wire Tr, and without removing the existing auxiliary catenary wire Ax, by leaving it supported by the catenary wire support fittings Sp below the movable bracket 102. During this process, there is no need to add an additional parallel line or apply a tensile force that exceeds the total tension of the existing overhead contact line.

[0016] 6 and 7, another embodiment of the present invention includes a fifth step of transferring the auxiliary catenary wire Ax, which is supported by the catenary wire support bracket Sp below the movable bracket 102 in the fourth step performed at the second train gap, to the second catenary wire support bracket Sp2 on the movable bracket 102 at the third train gap. By transferring the auxiliary catenary wire Ax onto the movable bracket 102, the catenary configuration becomes as shown in FIG.

[0017] The process of attaching the second overhead line support bracket Sp2 to the movable bracket 102 can be carried out at either the first or second train interval, but it is more efficient to carry it out at the same time as attaching the overhead line support bracket Sp, as shown by the phantom line in Figure 2.

[0018] Trains can continue to operate without any problems thanks to the overhead line configuration obtained by the fourth step shown in Figure 5. However, if sufficient separation distance cannot be secured between the auxiliary catenary wire Ax and the contact wire Tr, the fifth step can be carried out at the third train interval as necessary. [Explanation of symbols]

[0019] Me Messenger Line Dp Dropper Ax Auxiliary messenger wire Hg Hanger Hg2 New hangar Thg Temporary hanging member Tr 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 Second overhead line support bracket 101 Lower bundle 102 Movable bracket

Claims

1. A dropper was placed 200 mm below the catenary wire made of copper-based metal stranded wire supported on the movable bracket. 2 An auxiliary catenary wire made of copper-based metal stranded wire is suspended, and a 170 mm long catenary wire is installed below the auxiliary catenary wire via an existing hanger. 2 a compound catenary type contact line in a tunnel, in which a contact wire made of a bronze wire is suspended, the contact wire is held at a tension of 2.0 tons in a first holding part of a first yoke of a tension balancer having a tension of 5.5 tons, the auxiliary contact wire is held at a tension of 2.0 tons in a third holding part of a second yoke connected to a second holding part of the first yoke, and the contact wire is held at a tension of 1.5 tons in a fourth holding part of the second yoke, the compound catenary type contact line in a tunnel being converted to a simple catenary type contact line in which the contact wire is suspended via a new hanger below the contact wire, a first step of attaching an overhead line support bracket to the movable bracket at a first train interval, the overhead line support bracket being positioned to the side of the catenary wire and having a support portion below the movable bracket, thereby allowing trains to pass; a second step of attaching the new hanger to the catenary wire at a second train interval, removing the existing hanger, suspending the trolley wire Tr by the new hanger, temporarily suspending the auxiliary catenary wire suspended by the dropper with a temporary suspending member below the movable bracket, and securing the trolley wire to the third retaining portion of the second yoke with a tension of 2.0 t and securing the auxiliary catenary wire to the fourth retaining portion of the second yoke with a tension of 1.5 t; a third step of removing the dropper, hooking the auxiliary catenary wire to the support portion of the catenary wire support bracket, and removing the temporary hanging member at a second train interval; and a fourth step of connecting the catenary wire and the contact wire with a connector at a second train interval to establish electrical continuity.

2. 2. The method for switching electric rail tracks in a tunnel according to claim 1, further comprising the step of: in the second step, if the spacing between the auxiliary catenary wire and the catenary wire supported on the catenary support fittings is insufficient, installing a separator between them to ensure spacing within the span.

3. a step of attaching, in addition to the overhead line support bracket, a second overhead line support bracket positioned laterally of the catenary wire and having a support portion on the movable bracket, on the movable bracket at the first or second train interval; 2. The method for switching electric rail tracks in a tunnel according to claim 1, further comprising a fifth step of: at a third train interval, hanging the auxiliary catenary wire on the catenary support bracket across the movable bracket and fastening it to a support portion of the second catenary support bracket on the movable bracket, removing the catenary support bracket, and installing a separator between the auxiliary catenary wire and the catenary wire to separate them within the span.

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