Slider for eliminating height differences in rigid overhead power lines and method for installing the same.

Abstract

This invention provides a slider for eliminating height differences, which allows for the easy installation of temporary support tracks to resolve height differences between adjacent old and new mounting rails. [Solution] The step-leveling slider 1 comprises a temporary joint plate 2 fastened and fixed with bolts and nuts 6 so as to be in close contact with the outer surface of the auxiliary conductor 104, in place of the joint plate 107 that was removed at the joint of the existing and newly installed frame rails 102A and 102B; two fixing brackets 3 fixed to the conductive steel rail 103 at positions located at a predetermined distance in the extension direction from the joint of the existing and newly installed frame rails 102A and 102B; a support plate 4 made of a metal strip supported by the fixing brackets 3 near both ends and extending between the two fixing brackets 3; and a trolley wire 5 supported by the support plate 4 via a plurality of ears 7 so as to extend along the lower edge of the support plate 4.

Description

Technical Field

[0001] The present invention relates to a step elimination slider that forms another sliding surface on the side along the sliding surface where a step has occurred in order to eliminate a step formed on the sliding surface with a pantograph in a rigid electric wire, and a method of construction for installing the same.

Background Art

[0002] Conventionally, in subways and the like, rigid electric wires that can reduce the installation space are often used as electric wires for supplying power to trains. The rigid electric wire is a fixed-length conductor formed by connecting a large number of gantry rails in the length direction, which are based on highly rigid aluminum gantries or conductive steel rails (both about 10 m in length), supporting trolley wires thereon, or attaching highly conductive auxiliary conductors to the abdomen. The gantry rail is supported by the ceiling at the upper flange portion. Patent Document 1 discloses a rigid electric wire in which a plurality of fixed-length gantry rails formed by attaching auxiliary conductors such as aluminum flat angle wires having substantially the same length as the fixed-length conductive steel rails to both side surfaces of the fixed-length conductive steel rails are connected with aluminum joint plates interposed at the connecting ends thereof. Also, FIG. 3 of Patent Document 2 discloses a rigid electric wire in which a large number of fixed-length gantry rails having a substantially T-shaped cross section having a flange-shaped upper side and a leg side hanging down from the center of the upper side are connected, and a trolley wire is held at the lower end of the leg side via an ear. Similarly, FIG. 5 of Patent Document 2 discloses a rigid electric wire in which a large number of fixed-length gantry rails having a pair of leg sides hanging down from a flange-shaped upper side are connected, and a trolley wire is sandwiched between the lower ends of both leg sides.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0004] In both rigid overhead catenary systems using aluminum frames and rigid overhead catenary systems using conductive steel rails, steps may occur on the sliding surface of the pantograph due to localized wear or other factors. The first object of the present invention is to provide a step-eliminating slider and a method for installing the same, which can be easily and quickly installed to eliminate steps in such rigid overhead catenary systems without replacing the standard-length frame rails themselves. Furthermore, in rigid overhead catenary lines that use conductive steel rails as support rails, steps may occur on the sliding surface in the following cases, for example. When the sliding surface of this rigid overhead catenary line wears down due to long-term use (e.g., 30 years or more), the entire line needs to be replaced. This replacement work is carried out sequentially for each standard-length support rail that makes up the line, in the direction of the train's travel, during the limited time between the last train and the first train. However, steps inevitably occur on the sliding surface between adjacent new and existing support rails, so it is necessary to temporarily install a support track to eliminate these steps until work can resume during the next train interval. Conventionally, to attach this support wire, numerous bolts fastening the joint plate and auxiliary conductor over a predetermined length between the newly installed and existing mounting rails are temporarily removed. Ears are then placed on the sides of the joint plate and auxiliary conductor at each fastening point, the trolley wire (as the support wire) is gripped by these ears, and the bolts are re-tightened to fasten it together with the joint plate and auxiliary conductor. When fixing the trolley wire, it is necessary to bend and adjust the sliding surface of the trolley wire on-site so that it is smoothly continuous from the height of the sliding surface of the new mounting rail to the height of the sliding surface of the existing mounting rail. Since there are numerous bolt attachment and removal points, and bending the trolley wire on-site is a difficult task, the work takes a long time. Furthermore, since the numerous fastening points to be worked on, especially the fastening points of the auxiliary conductor, are important points for ensuring conductivity and corrosion prevention performance, it is desirable to avoid attaching and removing bolts. Therefore, the second object of the present invention is to provide a step-leveling slider and a method for installing it, which allows for the quick and easy installation of a support wire to eliminate the step difference between adjacent old and new support rails in a rigid overhead line using conductive steel rails as support rails, without having to remove or reattach the bolts that fasten the auxiliary conductors. [Means for solving the problem]

[0005] To solve the first problem described above, the rigid overhead line step-eliminating slider 1 according to the present invention comprises two fixing fittings 3 fixed to flange portions 103b, 202a, and 302a at positions located at a predetermined distance before and after the step in the extension direction of the support rails 102, 202, and 302; a support plate 4 made of a conductive metal strip supported by these fixing fittings 3 near both ends and electrically connected to the support rails 102, 202, and 302 between the two fixing fittings 3; and a trolley wire 5 supported at the lower edge of the support plate 4 via a plurality of ears 7. The sliding surface of the trolley wire 5 is set at a position lower than the height of the sliding surface of the rigid overhead line 101, 201, and 301 at the front and rear positions of the step, and at a position higher than the height of the sliding surface of the rigid overhead line 101, 201, and 301 at both ends. Furthermore, the installation method for the step-leveling slider 1 is characterized by including the steps of: forming a slider unit 9 by pre-assembling the fixing bracket 3, support plate 4, ear 7, and trolley wire 5 at a factory or the like; transporting the slider unit 9 to the installation site; and securing the slider unit 9 to the rigid overhead line 101, 201, 301 by fixing the fixing bracket 3 to the frame rails 102, 202, 302 at predetermined locations before and after the step. To solve the second problem described above, the slider 1 for eliminating steps in a rigid overhead line 101 according to the present invention is characterized by comprising: a temporary joint plate 2 fastened and fixed with bolts and nuts 6 so as to be in close contact with the outer surface of the auxiliary conductor 104, in place of the joint plate 107 that has been removed at the joint of the existing and newly installed frame rails 102A and 102B; two fixing fittings 3 fixed to the rail 103 at positions located at a predetermined distance in the extension direction from the joint of the existing and newly installed frame rails 102A and 102B; a support plate 4 made of a metal strip supported by the fixing fittings 3 near both ends and extending between the two fixing fittings 3; and a trolley wire 5 supported by the support plate 4 via a plurality of ears 7 along the lower edge of the support plate 4. Furthermore, the installation method for the slider 1 for eliminating steps in a rigid overhead line according to the present invention includes the first step of placing a temporary joint plate 2 at the location where the joint plate 107 is to be attached between the existing and new frame rails 102A and 102B, inserting threaded rods 6 through the existing and new frame rails 102A and 102B via the first and second bolt holes 2a, so as to protrude both ends to the outside of the temporary joint plate 2, and the second step of screwing inner nuts 6b onto the threaded rods 6 from both ends and tightening the inner nuts 6b within the counterbores 2b and 2c to fasten and fix the temporary joint plate 2 to the outer surface of the auxiliary conductors 104 of the existing and new frame rails 102A and 102B. The slider unit 9, which is assembled in advance at a factory or the like, comprises a process and a fixing bracket 3, a support plate 4, a trolley wire 5, and an ear 7. The third process involves inserting both ends of a threaded rod 6 protruding from the temporary joint plate 2 into a bolt hole 4a formed in the middle of the support plate 4, and screwing an outer nut 6c onto both ends to tighten and fix the middle part of the support plate 4 to the outer surface of the temporary joint plate 2. The fourth process involves fixing the fixing bracket 3 to predetermined locations on the existing and new frame rails 102A and 102B, thereby hooking the slider unit between the existing and new frame rails 102A and 102B. [Effects of the Invention]

[0006] The slider for eliminating steps in rigid overhead line according to the present invention allows for the quick and easy installation of a support wire to eliminate steps that occur on the sliding surface of the rigid overhead line. Furthermore, the slider for eliminating height differences in rigid overhead catenary tracks using conductive steel rails according to the present invention allows for the quick and easy installation of a temporary support wire to eliminate height differences between adjacent new and old support rails without the need to remove or reattach the bolts that fasten the auxiliary conductors, and therefore without the risk of causing deterioration of conductivity. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing the installed state of the rigid overhead line step-eliminating slider of the present invention. [Figure 2] This is an exploded perspective view of part II in Figure 1. [Figure 3] This is an exploded perspective view of the step-leveling slider for rigid overhead line according to the present invention. [Figure 4] This is a front view showing the mounting state of the step-leveling slider for rigid overhead line according to the present invention. [Figure 5] Figure 4 is a cross-sectional view of the VV section. [Figure 6] Figure 4 is a cross-sectional view of the section between VI and VI. [Figure 7] This is a cross-sectional view of section VII-VII in Figure 4. [Figure 8] This is a section view of line VIII-VIII in Figure 4. [Figure 9] This is a front view of a section of a rigid overhead line. [Figure 10] Figure 9 is an exploded perspective view of section X. [Figure 11] This is an enlarged cross-sectional view of line XI-XI in Figure 9. [Figure 12] Figure 9 shows an enlarged cross-sectional view of line XII-XII. [Figure 13] This is a front view showing an embodiment of applying the rigid overhead line step-eliminating slider of the present invention to other types of rigid overhead lines. [Figure 14] Figure 13 is an enlarged cross-sectional view of section XIV-XIV. [Figure 15]It is an enlarged cross-sectional view taken along line XV-XV of FIG. 13. [Figure 16] It is a front view showing an embodiment in which the step elimination slider of the rigid overhead line of the present invention is applied to another type of rigid overhead line. [Figure 17] It is an enlarged cross-sectional view taken along line XVII-XVII of FIG. 13. [Figure 18] It is an enlarged cross-sectional view taken along line XVIII-XVIII of FIG. 13.

Embodiment for Carrying Out the Invention

[0008] First, a case where the step elimination slider 1 of the present invention is applied to a rigid overhead line 101 using a conductive steel rail 103 as a fixed-length pedestal rail 102 (FIGS. 1 to 8) will be described as an example.

[0009] In this rigid overhead line 101, during the construction of sequentially replacing the pedestal rails 102 that make up the rigid overhead line 101, a step G (FIGS. 2, 7, 8) may occur between the sliding surfaces 103c of the adjacent existing and newly installed pedestal rails 102A and 102B.

[0010] Here, referring to FIGS. 9 to 12, the structure of the rigid overhead line 101 to which the step elimination slider 1 of the present invention is applied will be described. In FIG. 9, the rigid overhead line 101 is configured by connecting a number of fixed-length pedestal rails 102 and ensuring electrical connection with each other by a joint plate 107.

[0011] The pedestal rail 102 is a composite rail in which auxiliary conductors 104 having substantially the same length as the conductive steel rail 103 are attached to both side surfaces of the abdomen 103a of a fixed-length conductive steel rail 103 (for example, 10 m), and this is electrically and integrally fixed to the conductive steel rail 103. The lower surface of the head of the conductive steel rail 103 becomes a sliding surface 103c on which the pantograph slides.

[0012] As shown in Figure 9, the auxiliary conductor 104 is fastened to the web 103a of the conductive steel rail 103 with bolts and nuts 106 via silver brazed spacers 105 at bolt holes 102b provided at multiple locations (for example, 18 locations at 50 cm intervals) along the extension direction of the conductive steel rail 103, as shown in Figure 11.

[0013] As shown in Figures 9 and 10, the copper joint plate 107 is fastened with bolts and nuts 108 at the bolt holes 102a at the joint ends of the two support rails 102. The bolt holes 102a are provided at both ends of the support rails 102 and, as shown in Figure 12, pass through the web 103a, spacer 105, and auxiliary conductor 104. The joint plate 107 has bolt holes 107a corresponding to the bolt holes 102a, and the bolts and nuts 108 pass through both bolt holes 102a and 107a.

[0014] Next, we will describe the construction work for sequentially replacing the standard-length support rails 102 in a rigid overhead line 101 constructed by joining standard-length support rails 102 as described above.

[0015] Figure 4 shows the state in which the existing support rail 102A and the newly installed support rail 102B are connected during the process of sequentially replacing standard-length support rails 102. In this state, a step G is created between the sliding surface 103c of the new support rail 102A and the sliding surface 103c of the new support rail 102B, as shown in Figures 7 and 8. In this state, the work must be temporarily suspended, and the step G on the sliding surface 103c must be eliminated until the work can be resumed at the next train interval. The step-eliminating slider 1 is installed over a predetermined length range of the joint between the existing and new support rails 102A and 102B to eliminate this step G, and is removed after both the front and rear support rails 102 have been replaced with new ones.

[0016] In Figures 1-3, the step-leveling slider 1 comprises a temporary joint plate 2 installed in place of the existing joint plate 107 shown in Figures 9-12, a fixing bracket 3 fixed to the conductive steel rail 103, a support plate 4 suspended from the fixing bracket 3, and a trolley wire 5 supported by ears 7 along the support plate 4. The fixing bracket 3, support plate 4, and trolley wire 5 are assembled in advance at a factory or the like as a slider unit 9 (Figure 3). In the slider unit 9, the trolley wire 5 is assembled in a manner that is lower in the center and higher at both ends in order to eliminate the step G (approximately 10 mm) between the sliding surfaces 103c of the existing and newly installed frame rails 102A and 102B.

[0017] In order to sequentially replace the support rails 102, it is necessary to temporarily remove the joint plates 107 (Figure 10) that connect the existing support rails 102. The temporary joint plate 2 is used during construction to replace the removed existing joint plate 107 and connect the existing support rail 102A and the new support rail 102B. It is fastened and secured with bolts and nuts 6 so that it is in close contact with the outer surface of the auxiliary conductor 104 of both support rails 102A and 102B. This mechanically and electrically connects the existing and new support rails 102A and 102B (Figure 2).

[0018] Therefore, as clearly shown in Figure 2, the temporary joint plate 2 has two bolt holes 2a with first and second counterbore 2b and 2c corresponding to the four bolt holes 107a (Figure 10) of the existing joint plate 107, and two other third and fourth bolt holes 2d outside of them. As clearly shown in Figure 28, threaded rods 6a are inserted through the bolt holes 2a, and the temporary joint plate 2 is tightened and fixed to the outer surface of the auxiliary conductor 104 with inner nuts 6b. The counterbore portions 2b and 2c hold the inner nuts 6b, which are screwed onto the threaded rods 6a, so that they do not protrude from the outer surface of the temporary joint plate 2. Therefore, there is no hindrance to tightly attaching the support plate 4 to the outer surface of the temporary joint plate 2.

[0019] Furthermore, one counterbore portion 2b of the bolt hole 2a of the temporary joint plate 2 has a cross-sectional shape that prevents the inner nut 6b from rotating, while the other counterbore portion 2c has a cross-sectional shape that allows a box wrench used to tighten the inner nut 6b to be inserted. By installing the left and right temporary joint plates 2 in alternating orientations, the counterbore portions 2b and 2c with different cross-sectional shapes are brought into opposition.

[0020] In Figures 1 and 3, the two fixing brackets 3 are fixed to the conductive steel rail 103 at positions located at a predetermined distance in the extension direction from the joint (stepped portion) of the existing and newly installed frame rails 102A and 102B, respectively. As clearly shown in Figure 5, the fixing bracket 3 comprises a pair of identical fixing members 31 that grip the conductive steel rail 103 in a direction perpendicular to its extension.

[0021] The fixing member 31 comprises a mounting plate portion 31a, a bracket portion 31b, a support piece 31c, and a clamping piece 31d. The mounting plate portion 31a abuts against the upper surface of the flange portion 103b of the conductive steel rail 103 and extends to near its center. The bracket portion 31b rises perpendicularly from the inner end of the mounting plate portion 31a, facing in a direction perpendicular to its extension, and is fastened with a bolt 32. The support piece 31c hangs perpendicularly from the outer end of the mounting plate portion 31a along both outer edges of the flange portion 103b of the conductive steel rail 103. The clamping piece 31d protrudes inward from the inside of the support piece 31c and clamps both edges of the flange portion 103b between itself and the lower surface of the mounting plate portion 31a.

[0022] The support plate 4 is made of a metal strip and is supported by bolts 33 to the support pieces 31c of the fixing brackets 3 near both ends, and is installed so as to extend between both fixing brackets 3. The support plate 4 is fastened together with the temporary joint plate 2 at the middle using bolts and nuts 6, 8 on the outer surface of the temporary joint plate 2. The support plate 4 has a shape in which the lower edge gradually rises from the center in the direction of extension toward both ends.

[0023] As clearly shown in Figures 7 and 8, one bolt and nut 8 used to fasten the support plate 4 to the outer surface of the temporary joint plate 2 consists of a bolt 8a inserted through the bolt hole 2d and a nut 8b screwed onto it (Figure 7), while the other bolt and nut 6 consists of a threaded rod 6a inserted through the bolt hole 2a and an outer nut 6c screwed onto it (Figure 8).

[0024] In Figure 8, the temporary joint plate 2 is individually pressed against the outer surface of the auxiliary conductor 104 by threaded rod 6a and inner nut 6b, thereby ensuring a reliable electrical and mechanical connection between the existing and newly installed support rails 102A and 102B. Furthermore, as shown in Figures 7 and 8, the temporary joint plate 2 is firmly fastened by the auxiliary conductor 104 during the installation process of the slider unit 9 by fastening it together with the support plate 4 using bolt 8a, nut 8b and threaded rod 6a and outer nut 6c.

[0025] As clearly shown in Figure 4, the trolley wire 5 is supported by a plurality of ears 7 fixed with bolts 71 at predetermined intervals in the extension direction inside the lower edge of the support plate 4. The sliding surface 51 at one end of the trolley wire 5 is positioned higher than the height of the sliding surface 103c of the conductive steel rail 103 of the newly installed frame rail 102B (position indicated by the solid line in Figure 8), and the sliding surface 51 at the other end is positioned higher than the height of the sliding surface 103c of the conductive steel rail 103 of the existing frame rail 102A (position indicated by the solid line in Figure 7), thereby eliminating the step difference G between the sliding surfaces 103c of both frame rails 102A and 102B. As a result, the pantograph, which has been moving forward while sliding against the sliding surface 103c of the newly installed mounting rail, moves to the sliding surface 51 of the trolley wire 5 parallel to the newly installed mounting rail 102B before reaching the existing mounting rail 102A, and slides along it, gradually rising by the height of the step of approximately 10 mm, before moving onto the sliding surface 103c of the parallel existing mounting rail 102A, allowing it to slide smoothly without any steps.

[0026] Next, the installation process for the step-leveling slider 1 will be explained. When the work between trains is completed with the rear of the adjacent support rails 102A and 102B, the support rail 102B, replaced with a new one, the joint plate 107 (Figures 9 and 10) connecting the existing and new support rails 102A and 102B is removed. A temporary joint plate 2 is placed where the joint plate 107 should be attached, and as shown in Figures 2 and 8, threaded rods 6a are inserted through the first and second bolt holes 2a so as to penetrate the existing and new support rails 102A and 102B, respectively, with both ends protruding to the outside of the temporary joint plate 2.

[0027] Next, the inner nuts 6b are screwed onto the threaded rod 6a from both ends, and the inner nuts 6b are tightened within the counterbores 2b and 2c, thereby fastening and fixing the temporary joint plate 2 to the outer surface of the auxiliary conductors 104 of the existing and new support rails 102A and 102B.

[0028] In the slider unit 9 (Figure 3), which is pre-assembled in a factory or elsewhere with the fixing bracket 3, support plate 4, and trolley wire 5, both ends of a threaded rod 6a protruding from the temporary joint plate 2 are inserted through the bolt hole 4a formed in the middle of the support plate 4, and an outer nut 6c is screwed onto both ends to fasten and fix the middle part of the support plate 4 to the outer surface of the temporary joint plate 2 (Figure 7). Also, as clearly shown in Figure 7, a bolt 8a is passed through the bolt hole 4b of the support plate 4 via bolt holes 2d and 102a, and a nut 8b is screwed onto it to fasten and fix the middle part of the support plate 4 to the outer surface of the temporary joint plate 2.

[0029] Next, the entire slider unit 9 is secured between the existing and new mounting rails 102A and 102B by fixing the fixing bracket 3 to the designated locations on the existing and new mounting rails 102A and 102B.

[0030] The trolley wire 5 is curved vertically so as to create a seamless transition from the sliding surface 103c of the newly installed frame rail 102B to the sliding surface 103c of the existing frame rail 102A, allowing the train's pantograph to slide smoothly between the existing and newly installed frame rails 102A and 102B.

[0031] The above describes the use of the step-eliminating slider 1 of the present invention to eliminate the step difference that occurs on the sliding surface 103c of the connection between the existing support rail 102A and the new support rail 102B during construction work to replace the support rail 102 of the rigid overhead line 101. However, the step-eliminating slider 1 of the present invention can take a second embodiment to eliminate steps formed on the sliding surface 103c of other locations in the rigid overhead line 101 having the same structure. In this case, since the support rail at the location where the step occurs is not replaced, there is no need to remove the joint plate 107. For this reason, the step-eliminating slider 1 of the second embodiment is composed of a part of the step-eliminating slider 1 of the first embodiment, excluding the temporary joint plate 2.

[0032] Therefore, the step-leveling slider 1 of this embodiment comprises two fixing brackets 3 fixed to the flange portion 103b at positions located at a predetermined distance before and after the step in the extension direction of the frame rail 102 from the step in the sliding surface 103c, a support plate 4 made of a conductive metal strip supported by the fixing brackets 3 near both ends and electrically connected to the frame rail 102 between the two fixing brackets 3, and a trolley wire 5 supported at the lower edge of the support plate 4 via a plurality of ears 7. The sliding surfaces 51 at both ends of the trolley wire 5 are set at a position higher than the height position of the sliding surface 103c of the rigid overhead line 102, similar to the previous embodiment, and the sliding surfaces 51 before and after the step are set at a position lower than the height position of the sliding surface 103c of the rigid overhead line 102.

[0033] As shown in Figures 13-15, the step-eliminating slider 1 of the second embodiment described above can also be applied to rigid overhead line 201 of other structures. This rigid overhead line 201 has a frame rail 202 with a substantially T-shaped cross-section, comprising a flange-shaped upper piece 202a (flange portion) and a leg piece 202b hanging down from the center of the upper piece 202a, and the trolley wire T is gripped by the leg piece 202b via an ear 203. In this rigid overhead line 201, if the sliding surface wears down over time, only the trolley wire T can be replaced, so it is not necessary to replace the frame rail 202 itself. Therefore, no steps occur in the joint portion of the frame rail 202 during replacement work. However, steps may occur in parts other than the joint portion of the frame rail 202 due to partial wear of the sliding surface, etc. In this case, the step-eliminating slider 1 of the second embodiment of the present invention can be applied to eliminate the step without partially replacing the trolley wire T.

[0034] In Figure 13, if a step G occurs at the location indicated by arrow P, two fixing brackets 3 are fixed to the flange portion 202a at positions a predetermined distance before and after the step P in the extension direction of the support rail 202. A support plate 4 made of a conductive metal strip is supported by the fixing brackets 3 near both ends and is provided so as to extend between the two fixing brackets 3. The support plate 4 is electrically connected to the support rail 102. A trolley wire 5 is supported on the lower edge of the support plate 4 via a plurality of ears 7. The sliding surfaces at both ends of the trolley wire 5 are set at a higher position than the sliding surface of the rigid overhead line 102 before and after the step P, similar to the case of the rigid overhead line 101 described above, and the sliding surface of the trolley wire 5 at the step P is set at a lower position than the sliding surface of the rigid overhead line 102 before and after the step P.

[0035] The step-eliminating slider 1 of the second embodiment can also be applied to rigid overhead line 301 of yet other structures shown in Figures 16-18. This rigid overhead line 301 is constructed by connecting a large number of standard-length frame rails 302, each having a pair of leg sides 302b hanging down from a flange-shaped upper side 302a (flange portion), and gripping the trolley wire T between the lower ends of both leg sides 302b. In this rigid overhead line 301 as well, the frame rails 302 themselves are not replaced, but steps G may occur on the sliding surface at locations other than the joints of the frame rails. In this case, the step-eliminating slider 1 of the second embodiment of the present invention can be applied to eliminate the steps without partially replacing the trolley wire T.

[0036] In Figure 16, if a step G occurs at the location indicated by arrow P, two fixing brackets 3 are fixed to the flange portion 302a at a predetermined distance before and after the extension direction of the support rail 302 from the step P. A support plate 4 made of a conductive metal strip is supported by the fixing brackets 3 near both ends so as to extend between the two fixing brackets 3. The trolley wire 5 is supported on the lower edge of the support plate 4 via a plurality of ears 7. The sliding surfaces at both ends of the trolley wire 5 are set at a higher position than the height of the sliding surface of the rigid overhead line 301 before and after the step P, similar to the case of the rigid overhead line 101 and 201 described above, and the sliding surface at the step is set at a lower position than the height of the sliding surface of the rigid overhead line 301. [Explanation of symbols]

[0037] 1 Slider 2 Temporary joint plate 2a Bolt hole 2b Counterbore section 2c Counterbore 2d bolt hole 3 Fixing brackets 31 Fixing member 31a Mounting plate section 31b Bracket section 31c Support piece 31d clamping piece 32 volts 33 volts 4. Support plate 4a Bolt hole 5. Trolley wire 51 Sliding surface 6 bolts and nuts 6a Threaded rod 6b Inner nut 6c outer nut 7 Iya 8 bolts and nuts 9 Slider Unit 101 Rigid overhead line 102 Mounting rail 102A Existing mounting rail 102B Newly installed mounting rail 103 Conductive steel rail 103a Abdomen 103b Flange section 103c Sliding surface 104 Auxiliary conductor 105 Spacer 201 Rigid overhead line 202 Mounting rail 202a Upper piece (flange section) 202b leg piece 203 Iya T-type trolley wire 301 Rigid overhead line 302 Mounting rail 302a Upper piece (flange section) 302b leg piece 303 Iya

Claims

1. In a rigid overhead catenary system comprising a number of standard-length conductive support rails, each having a flange portion at the top and connected longitudinally to support the ceiling, a slider is provided, supported by the support rails, in order to eliminate the step difference formed on the sliding surface with the pantograph, Two fixing brackets are fixed to the flange portion at positions located at a predetermined distance before and after the extension direction of the mounting rail from the aforementioned step, A support plate made of a conductive metal strip, which is supported by the fixing brackets near both ends and electrically connected to the frame rail between the two fixing brackets, The support plate comprises a trolley wire supported at its lower edge via a plurality of wires, A slider for eliminating steps in a rigid overhead line, characterized in that the sliding surface of the trolley wire is set at a lower position than the height of the sliding surface of the rigid overhead line at the front and rear positions of the step, and at a higher position than the height of the sliding surface of the rigid overhead line at both ends.

2. The aforementioned fixing bracket comprises a support piece extending downward from the side edge of the flange portion, The support plate is fastened and secured to the outer surface of the support piece of the fixing bracket with bolts and nuts near both ends, and its lower edge has a shape that gradually rises from the center in the extension direction towards both ends. The slider for eliminating steps in a rigid overhead catenary according to claim 1, characterized in that the trolley wire is supported via a plurality of wires fixed at predetermined intervals in the longitudinal direction on the inside of the lower edge of the support plate.

3. The aforementioned fixing bracket comprises a pair of parallel support pieces extending downward from both side edges of the flange portion, The support plate consists of a pair that are fastened and fixed to the outer surface of the support piece of the fixing bracket with bolts and nuts near both ends, and each has a shape in which the lower edge gradually rises from the center in the direction of extension toward both ends. The slider for eliminating steps in a rigid overhead catenary according to claim 1, characterized in that the trolley wire is supported via a plurality of wires fixed at predetermined intervals in the extensional direction inside the lower edge of each support plate.

4. The aforementioned fixing bracket comprises a pair of opposing fixing members that grip the flange portion in a direction perpendicular to its extension, The rigid overhead line step-leveling slider according to claim 3, characterized in that the fixing member comprises a mounting plate portion that abuts against the upper surface of the flange portion and extends in a direction perpendicular to the extension of the flange portion, a bracket portion that stands upright at a right angle from the inner end of the mounting plate portion and is fastened to each other with bolts, a support piece that hangs down at a right angle from the outer end of the mounting plate portion along both outer edges of the flange portion, and a clamping piece that protrudes from the inside of the support piece so as to sandwich both edges of the flange portion between itself and the lower surface of the mounting plate portion.

5. A method for installing the step-reducing slider described in claim 1 on the rigid overhead line, The process of forming a slider unit by pre-assembling the aforementioned fixing bracket, the support plate, the ear, and the trolley wire, The process of transporting the aforementioned slider unit to the installation site, A method for installing a slider for eliminating steps in a rigid overhead line, characterized by the step of fixing the fixing fitting to the flange portion at predetermined locations before and after the step, thereby securing the slider unit to the rigid overhead line.

6. A slider for eliminating steps in a rigid overhead line according to any one of claims 1 to 4, characterized in that the mounting rail includes a conductive steel rail having the flange portion at its upper end and the sliding surface at its lower end.

7. A slider for eliminating steps in a rigid overhead catenary according to any one of claims 1 to 4, characterized in that the frame rail has the flange portion at the top and includes an aluminum frame rail that grips the trolley wire at the lower end.

8. A slider for eliminating steps in a rigid overhead catenary according to any one of claims 1 to 4, characterized in that the support rail includes a copper support rail having the flange portion at the upper end and gripping the trolley wire at the lower end.

9. In a rigid overhead catenary, a standard-length support rail is formed by electrically attaching an auxiliary conductor of approximately the same length as the conductive steel rail to the body of a standard-length conductive steel rail having a flange portion at the top, and the ends of these support rails are joined together and suspended from the ceiling of the tunnel, with a conductive joint plate interposed at the end that is in close contact with the outer surface of the auxiliary conductor, and fastened with bolts and nuts that penetrate the body of the conductive steel rail and the auxiliary conductor. In the course of replacing the aforementioned standard-length support rails in sequence, a slider is installed over a predetermined length range before and after the joint between the existing and new support rails in order to eliminate the step difference in the sliding surface between the existing support rail before replacement and the newly installed support rail after replacement, and is removed after the existing support rail is replaced. At the joint between the existing and newly installed support rails, a conductive temporary joint plate is fastened and secured with bolts and nuts to the outer surface of the auxiliary conductor, replacing the removed joint plate. Two fixing brackets are fixed to the conductive steel rail at positions located at a predetermined distance in the extension direction from the joints of the existing and new mounting rails, A support plate made of a conductive metal strip, supported by the fixing brackets near both ends and extending between the two fixing brackets, and fixed to the outside of the temporary joint plate by bolts and nuts in the middle section, The system comprises a trolley wire supported via a plurality of wires along the lower edge of the support plate, A step-eliminating slider for replacement work of a rigid overhead line, characterized in that the sliding surface of the trolley wire is set at a position lower than the height of the sliding surfaces of the newly installed and existing mounting rails at the front and rear positions of the step, and at each end position it is set at a position higher than the height of the sliding surfaces of the mounting rails, thereby eliminating the step difference in the sliding surface between the two mounting rails.

10. The temporary joint plate is provided with at least two bolt holes, a first and a second, corresponding to the bolt holes of the joint plate, and is fastened and secured to the outer surface of the auxiliary conductor with threaded rods and inner nuts inserted through the bolt holes. The aforementioned fixing bracket is fixed to the flange portion of the conductive steel rail and comprises a pair of support pieces extending parallel to the body from both edges of the flange portion. The support plate consists of a pair of plates, each fastened and secured with bolts and nuts to the outer surface of the support piece of the fixing bracket near both ends, and fastened and secured with threaded rods and outer nuts to the outer surface of the temporary joint plate in the middle, with the lower edge of each plate gradually rising from the center in the extension direction towards both ends. The trolley wire is supported by a plurality of wires fixed at predetermined intervals in the longitudinal direction on the inside of the lower edge of the support plate. The sliding surface of the trolley wire is set at a position lower than the height of the sliding surfaces of the newly installed and existing frame rails at the front and rear positions of the step, and at each end position it is set at a position higher than the height of the sliding surfaces of the frame rails, thereby eliminating the step between the sliding surfaces of the frame rails. The step-leveling slider for replacement work of rigid overhead line according to claim 9, characterized in that the first and second bolt holes in the temporary joint plate are provided with counterbore portions that hold the inner nuts, which are screwed onto the threaded bolts, so as not to protrude from the outer surface of the temporary joint plate.

11. The step-leveling slider for replacement work of rigid overhead line according to claim 10, characterized in that the counterbore portion of one of the first and second bolt holes has a cross-sectional shape that prevents the inner nut, which is screwed onto the threaded rod, from rotating.

12. The temporary joint plate is positioned at intervals on both the outward and longitudinal directions relative to the first and second bolt holes, and further comprises third and fourth bolt holes corresponding to the other two bolt holes of the joint plate. The support plate is further fastened and fixed to the outer surface of the auxiliary conductor together with the temporary joint plate at its intermediate portion by bolts and nuts inserted through the third and fourth bolt holes, as described in claim 10, for the step-leveling slider for replacement work of rigid overhead line.

13. The aforementioned fixing bracket comprises a pair of identical fixing members that grip the conductive steel rail in a direction perpendicular to its extension, The fixing member comprises a mounting plate portion extending in contact with the upper surface of the flange portion of the conductive steel rail, a bracket portion rising perpendicularly from the inner end of the mounting plate portion and facing in a direction perpendicular to its extension and fastened with bolts, a support piece hanging perpendicularly from the outer end of the mounting plate portion along both outer edges of the flange portion of the conductive steel rail, and a clamping piece protruding from the inside of the support piece so as to sandwich both edges of the flange portion of the conductive steel rail between itself and the lower surface of the mounting plate portion, as described in claim 9, for step-leveling work for replacing rigid overhead line.

14. In a construction project to sequentially replace the standard-length support rails constituting the rigid overhead line in the direction of train travel, a method is provided to install the slider between the existing and new support rails in order to eliminate the step difference in the sliding surface that occurs between the newly installed support rails that have been replaced during the interval between trains and the existing support rails adjacent to the newly installed support rails before replacement, until the construction is resumed at the next interval between trains. The first step involves placing the temporary joint plate at the location where the joint plate is to be attached between the existing and new frame rails, inserting the threaded rods through the first and second bolt holes so as to penetrate the existing and new frame rails, and allowing both ends to protrude outwards from the temporary joint plate. A second step involves screwing inner nuts onto the threaded rod from both ends and tightening the inner nuts within the counterbore, thereby fastening and fixing the temporary joint plate to the outer surface of the auxiliary conductor of the existing and new frame rails. A third step involves assembling the aforementioned fixing bracket, the support plate, and the trolley wire in advance at a factory or the like to form a slider unit. A fourth step is to transport the slider unit to the installation site, A fifth step involves fixing the fixing bracket of the slider unit to predetermined locations on the existing and new mounting rails, thereby securing the slider unit between the existing and new mounting rails. A method for installing a step-leveling slider for replacement work of a rigid overhead line, according to claim 10, characterized by including a sixth step of inserting both ends of the threaded rod protruding from the temporary joint plate into the bolt holes in the middle of the support plate of the slider unit, and screwing the outer nuts onto both ends to tighten and fix the middle part of the support plate to the outer surface of the temporary joint plate.

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