Single track direct elevation construction method and railway section elevation construction method

Abstract

To provide a single track direct elevation construction method which can be combined with a temporary track construction method for each single track when there is an obstructing building on a part of a temporary track site.SOLUTION: This is a single track direct elevation construction method which elevates two parallel tracks for each single track, and includes a support pile driving step, a temporary platform construction step, a first temporary track construction step, a first temporary track suspension step, a single track elevation first line construction step, a second temporary track construction step, a second temporary track suspension step, and a single track elevation second line construction step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a direct-over-rail elevated construction method for constructing an elevated section directly above a railway operating line, and in particular to a single-track direct-over-rail elevated construction method that enables a double-track track to be directly elevated on a single-track basis, and a railway section elevated construction method using the same. [Background technology]

[0002] Traditionally, railway tracks have been laid at a flat surface above ground, which has led to the risk of traffic congestion at railway crossings and collisions with pedestrians and vehicles. In urban areas in particular, the increase in railway transportation volume has led to longer periods of time that railway crossings are closed, resulting in traffic congestion and restrictions on access, and a decline in the convenience of the area. One way to solve this problem is to elevate railway tracks by raising them above ground level using viaducts.

[0003] As a method for elevating railways, the STRUM (registered trademark) method described in Patent Document 1 is known. The STRUM method involves constructing a switching track directly below or above the commercial line without setting up a temporary track, and switching the track in the short time between the last train and the first train. By not setting up a temporary track, negotiations to secure land for the temporary track are not necessary when elevating the track, so there is less risk of delays in the construction period due to negotiations, and elevation can be completed quickly. However, construction costs are high because elevated sections must be constructed directly above the commercial line for the entire section of the double-track railway.

[0004] Furthermore, Patent Document 2 describes a construction method for the approach section from an existing line to a line directly above when constructing an elevated track directly above a commercial line. This construction method is used to send out the track for the approach section assembled on the elevated section, but it requires a sturdy platform (gate structure 45) at the section where the track is sent out (descent section), which requires a large crane and installation space for it, as well as a work yard to receive the track being sent out.

[0005] On the other hand, if land for the temporary line can be secured, a temporary line construction method can be used, which has low construction costs and allows the temporary line land to be reused after the line is elevated. In particular, when the existing railway is double-tracked and at least one temporary track can be secured on the side, it is possible to switch tracks for each single track using the temporary track construction method. The temporary track construction method in this case is carried out in the following steps. (1) Acquire land and secure land for the temporary line (Figure 44). (2) A temporary second track is installed on the temporary track site, which is the temporary track for the track closest to the temporary track site (the second track, in this example, the up track) and switched (Figure 45). (3) The second line is removed and a temporary first line, which is a temporary line for the track farthest from the temporary line site (the first line, in this example, the down line), is installed on the temporary line site side of the second line and switched (Figure 46). (4) Elevate the first line and switch over from the temporary first line (Figure 47). (5) Remove the temporary first line and elevate the second line, then switch over from the temporary second line (Figure 48).

[0006] In addition, there are methods described in Patent Documents 3 and 4 as construction methods for switching tracks after temporarily supporting the track using temporary girders or the like. Patent Document 3 discloses a system in which a truss beam (super wing) is provided to surround a double track, and the track is temporarily supported by the truss beam. In addition, in Patent Document 4, the track is maintained by construction girders, while the lower part of the track is excavated to install a roadbed and new track, and the construction girders are removed on the day the track is changed. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 47-31187 [Patent Document 2] Japanese Patent Application Publication No. 50-82709 [Patent Document 3] Japanese Patent Application Publication No. 04-120301 [Patent Document 4] JP 2001-262501 A Summary of the Invention [Problem to be solved by the invention]

[0008] The temporary track method described above requires securing land for the temporary track in all sections where elevation will take place, and if there are buildings that are difficult to relocate (hereafter referred to as "obstructing buildings") on part of the temporary track land as in Figure 49, land acquisition will take time, which may result in delays to the project construction period. In addition, since the STRUM method installs track lift equipment outside the construction gauges on both sides of the track that is switched in one go, it is very difficult to apply this method to supplement the temporary track method for each single track in sections where there are obstructing buildings in normal double track sections where there is no space to install lift equipment between the double tracks because the construction gauges of the two tracks approach or overlap.

[0009] The method in Patent Document 3, like the STRUM method, temporarily supports double track rails together, but it does not allow the height of the temporarily supported rails to be changed, and therefore cannot be used to supplement the temporary track method for each line in sections where land acquisition is difficult. The construction method of Patent Document 4 maintains a single track using construction girders, but the new track is installed underneath the commercial line, and is not applicable to a construction method for constructing an elevated track directly above a commercial line.

[0010] The present invention aims to provide a single-track direct elevation construction method that can be combined with a single-track temporary line construction method when there is an obstructing building on part of the temporary line site, and a railway section elevation construction method combined with the single-track temporary line construction method. [Means for solving the problem]

[0011] The present invention is a single track straight elevation construction method for elevating two parallel tracks for each single track, the method comprising the steps of: (1) a support pile driving process for driving a first support pile that is outside the construction limit of one of the tracks and is located on the opposite side of the other track, and a second support pile that is outside the construction limit of the other track and is located on the opposite side of the one track; (2) a temporary gantry construction process for constructing a temporary gantry having a first support pillar that is joined and erected on the first support pile, a second support pillar that is joined and erected on the second support pile, and a covering girder that is placed between the upper part of the first support pillar and the upper part of the second support pillar; and (3) a first temporary track construction process for placing a first track unit having a temporary track for one of the tracks on top above one of the tracks; ( (4) a first temporary track hanging step of suspending the first track unit from the temporary gantry; (5) a single-track elevated first line construction step of lowering the first track unit suspended from the temporary gantry and switching one of the tracks to the temporary track above the first track unit; (6) a second temporary track construction step of disposing a second track unit above the other track, the second track unit having a temporary track of the other track on top; (7) a second temporary track hanging step of suspending the second track unit from the temporary gantry; and (8) a single-track elevated second line construction step of lowering the second track unit and switching the other track to the temporary track above the second track unit. In the step (1), an intermediate support pile is driven below the construction limit of one of the tracks and outside the construction limit of the other track, in the step (5), the first track unit is supported by the first support pillar and an intermediate support pillar that is erected by connecting to the intermediate support pile, and in the step (8), the second track unit is supported by the second support pillar and the intermediate support pillar. In the step (4), a jack may be placed on the upper part of the lining girder, and a hanger may be inserted into the jack and fixed at its lower end to the first track unit, and in the step (5), the first track unit may be lowered via the jack and the hanger. In the (7) step, a jack may be placed on the upper part of the lining girder, and a hanger may be inserted into the jack and fixed at its lower end to the second track unit, and in the (8) step, the second track unit may be lowered via the jack and the hanger. The first track unit may have a first construction cross girder perpendicular to one of the tracks, and in step (3), the first construction cross girder may be connected to and supported by the first support column of the temporary gantry, and in step (5), the first construction cross girder may be connected to and supported by the first support column of the temporary gantry. The second track unit may have a second construction cross girder perpendicular to the other track, and in step (6), the second construction cross girder may be connected to and supported by the second support column of the temporary gantry, and in step (8), the second construction cross girder may be connected to and supported by the second support column of the temporary gantry. At least a portion of the first track unit and / or the second track unit may be a sleeper-embracing construction girder. In the first temporary track construction step, a part of the first track unit may be installed at the same height as one of the tracks overnight after removing the other track, and in the single-track elevated first line construction step, a part of the first track unit may be lifted up and switched to the temporary track.

[0012] The present invention also relates to a railway section elevation method for elevating a section having an existing site where two tracks are parallel to each other, the section having a temporary line section where at least one temporary line site can be secured to the side of one of the tracks, and a temporary line unavailable section where the site cannot be secured, and for connecting the temporary line unavailable section to a main line, the method comprising the steps of: designating, of the parallel tracks, the track furthest from the temporary line site as a first line, and the track closest to the temporary line site as a second line, installing, on the temporary line site, a second temporary line that is a temporary line of the existing second line of the temporary line section, and switching the existing second line of the temporary line section to the second temporary line; and removing the existing second line of the temporary line section, and installing, on the temporary line site side within the existing site, the temporary line of the existing first line of the temporary line section. A railway section elevated construction method is provided, comprising: a first line temporary line making process of installing a first temporary line and switching the existing first line in the temporary line section to the first temporary line; a first line elevated process of constructing a viaduct of the first line on the existing first line in the temporary line section; a first line elevated connection process of connecting the viaduct of the first line and the first line of the main line via a single-track elevated first line constructed by the single-track straight overhead elevation construction method of the present invention in the temporary line unavailable section; a second line elevated process of constructing a viaduct of the second line on the existing second line in the temporary line section that has been removed; and a second line elevated connection process of connecting the viaduct of the second line and the second line of the main line via a single-track elevated second line constructed by the single-track straight overhead elevation construction method of the present invention in the temporary line unavailable section. Effect of the Invention

[0013] The present invention provides at least one of the following advantages by solving the above-mentioned problems. (1) Unlike the STRUM method described in Patent Documents 1 and 2, which involves switching multiple tracks at once, this method allows for elevation of each single track. (2) A track unit can be constructed for each single track above a temporary platform that encloses the two tracks in a gate shape, and then lowered to elevate each single track. (3) By driving the track support piles in advance, the work of driving the track support piles 341 on the night of the track changeover is eliminated. (4) By constructing a single track directly above only the sections where there are obstructing buildings, it is possible to combine this with the temporary line construction method, thereby reducing construction costs compared to building an elevated section directly above the entire section. (5) Since construction can begin without waiting for the land for the obstructing buildings to be acquired, the elevation project can be completed early. (6) Unlike the construction method of Patent Document 3, it is possible to elevate each single track at a time without temporarily supporting the double track track as a whole. [Brief description of the drawings]

[0014] [Figure 1] Diagram of the single track elevated construction method (1) [Diagram 2] Diagram of the single track elevated construction method (2) [Diagram 3] An explanatory diagram of step 1 of the single track vertical elevation construction method in Example 1 (1) [Figure 4] An explanatory diagram of step 1 of the single track vertical elevation construction method in Example 1 (2) [Diagram 5] An explanatory diagram of step 1 of the single track vertical elevation construction method in Example 1 (3) [Figure 6] An explanatory diagram of step 2 of the single track vertical elevation construction method in Example 1 (1) [Figure 7] An explanatory diagram of step 2 of the single track vertical elevation construction method in Example 1 (2) [Figure 8] An explanatory diagram of step 3 of the single track vertical elevation construction method in Example 1 (1) [Figure 9] FIG. 1 is an explanatory diagram of a first orbital unit in the first embodiment. [Figure 10] FIG. 2 is an explanatory diagram of the first orbital unit in the first embodiment. [Figure 11] Illustration of the girder suspension device [Figure 12] An explanatory diagram of step 4 of the single track vertical elevation construction method in Example 1 (1) [Figure 13] An explanatory diagram of step 4 of the single track vertical elevation construction method in Example 1 (2) [Figure 14]An explanatory diagram of step 5 of the single track vertical elevation construction method in Example 1 (1) [Figure 15] An explanatory diagram of step 5 of the single track vertical elevation construction method in Example 1 (2) [Figure 16] FIG. 1 is an explanatory diagram of a track support member in the first embodiment. [Figure 17] Diagram of the section using the single track vertical elevation construction method and the height of the temporary platform [Figure 18] An explanatory diagram of step 6 of the single track vertical elevation construction method in Example 1 (1) [Figure 19] An explanatory diagram of step 6 of the single track vertical elevation construction method in Example 1 (2) [Figure 20] An explanatory diagram of step 8 of the single track vertical elevation construction method in Example 1 (1) [Figure 21] An explanatory diagram of step 8 of the single track vertical elevation construction method in Example 1 (2) [Figure 22] An explanatory diagram of step 9 of the single track vertical elevation construction method in Example 1. [Figure 23] An explanatory diagram of step 1 of the single track vertical elevation construction method in Example 2 [Figure 24] An explanatory diagram of step 2 of the single track vertical elevated construction method in Example 2. [Diagram 25] An explanatory diagram of step 3 of the single-track vertical elevation construction method in Example 2 [Figure 26] An explanatory diagram of step 4 of the single-track vertical elevation construction method in Example 2. [Figure 27] An explanatory diagram of step 5 of the single track vertical elevated construction method in Example 2 [Figure 28] An explanatory diagram of steps 6 and 7 of the single track vertical elevation construction method in Example 2. [Figure 29] An explanatory diagram of a track support plate and a temporary track joint in Example 2. [Diagram 30] An explanatory diagram of step 8 of the single track vertical elevated construction method in Example 2 [Diagram 31] An explanatory diagram of step 1 of the single track vertical elevation construction method in Example 3. [Diagram 32] An explanatory diagram of step 2 of the single track vertical elevation construction method in Example 3. [Diagram 33] An explanatory diagram of steps 3 and 4 of the single track vertical elevation construction method in Example 3. [Diagram 34] An explanatory diagram of step 5 of the single track vertical elevated construction method in Example 3. [Diagram 35] An explanatory diagram of step 6 of the single-track vertical elevation construction method in Example 3. [Diagram 36] An explanatory diagram of step 8 of the single track vertical elevated construction method in Example 3. [Figure 37] Explanatory diagram of the railway section elevated construction method in Example 4 (1) [Figure 38] FIG. 1 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Figure 39] FIG. 2 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Diagram 40] FIG. 3 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Diagram 41] FIG. 4 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Diagram 42] FIG. 5 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Diagram 43] FIG. 6 is an explanatory diagram of the railway section elevated construction method in the fourth embodiment. [Diagram 44] Diagram of the conventional temporary line construction method (1) [Diagram 45] Diagram of the conventional temporary line construction method (2) [Figure 46] Diagram of the conventional temporary line construction method (3) [Figure 47] Diagram of conventional temporary line construction method (4) [Figure 48] Diagram of the conventional temporary line construction method (5) [Figure 49] Diagram of the conventional temporary line construction method (6) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the single-track direct elevation construction method and the railway section elevation construction method of the present invention will be described in detail with reference to the drawings.

[0016] [Example 1] (1) Overview of the Single-Track Direct Elevation Method The single track direct elevation construction method of the present invention is a construction method for elevating two existing parallel tracks (a first track 1 and a second track 2) such as double tracks (Figure 1). The single track straight up elevation method in this embodiment involves constructing a temporary gantry 3, lowering a new track unit 4 placed within the temporary gantry 3, and elevating the first track 1 and the second track 2, elevating the first track 1 single track first, and then elevating the second track 2 single track.

[0017] (2) Temporary platform The temporary gantry 3 encloses the two parallel first and second tracks 1 and 2 in a gate shape when viewed in the longitudinal direction of the tracks, and has a first support pillar 31 erected on the first track 1 side, a second support pillar 32 erected on the second track 2 side, and a lining girder 33 arranged between the upper parts of the first support pillar 31 and the second support pillar 32. The first support pillar 31, second support pillar 32 and covering girder 33 constituting the gate shape are arranged at predetermined intervals in the longitudinal direction of the existing track.

[0018] (3) Support The first support 31 and the second support 32 are positioned outside the construction gauges 11 and 21 of the first track 1 and the second track 2, respectively (Figure 2). The first support pillar 31 and the second support pillar 32 are connected to a support pile 34 driven into the ground and erected. The number of first pillars 31 and second pillars 32 is determined according to the site conditions and the design of the temporary platform 3, but in this embodiment, two first pillars 31 are arranged side by side in a direction perpendicular to the first track 1 (transverse direction), and a transverse horizontal member 311 is fixed at a predetermined height between the two first pillars 31 arranged side by side in the transverse direction.

[0019] (4) Covering girders, covering plates, and other horizontal members Continuous horizontal members 312, 322 that are continuous in the longitudinal direction of the track are fixed to the upper ends of the first support 31 and the second support 32, respectively. A lining girder 33 is then placed between the continuous horizontal member 312 on the first support 31 side and the continuous horizontal member 322 on the second support 32 side. Then, a covering plate 35 serving as a foothold is placed on top of the covering girder 33. Furthermore, in order to withstand horizontal forces during earthquakes and loads applied during work, the temporary gantry 3 is reinforced by arranging horizontal members 313, 323 in multiple stages in the height direction to connect adjacent first and second supports 31, 32 to each other on the first and second supports 31, 32 arranged in parallel in the longitudinal direction of the track. Among these, at the height supporting the elevated first track 1 and second track 2, track supporting horizontal members 314, 324 that serve both as reinforcement and track support are arranged. In addition, diagonal members 315 and the like may be appropriately arranged to reinforce the temporary gantry 3.

[0020] (5) Each step of the single track vertical elevation construction method The single track vertical elevation construction method of the present invention in this embodiment comprises the following steps.

[0021] (5.1) Step 1: Support pile installation process (Figs. 3, 4, and 5) In the first step, the support piles 34 that support the temporary platform 3 and the track support piles 341 that will support the new track units 4 when the track is elevated are driven in. In this embodiment, the support piles 34 and the track support piles 341 are both H-shaped steel, and the support piles 34 of the temporary platform 3 are H300x300x10x15 or larger, and the track support piles 341 supporting the track unit 4 are also H300x300x10x15 or larger. The support piles 34 for the temporary platform 3 are driven outside both the construction limits 11 and 21 of the first track 1 and the second track 2. The track support piles 341 are driven below the construction gauge 11 of the first track 1, which will be elevated as a single track first, and outside the construction gauge 21 of the second track 2. If the sleepers 12 of the first track 1 interfere with the construction of the track support piles 341, they are replaced in advance with wooden temporary sleepers 13 shortened to a length that does not interfere with the construction of the track support piles 341. The support piles 34 and the track support piles 341 are installed with a 600 mm casing in advance, and are then driven using a conventionally known method such as the BH pile method, TBH pile method, or PIP pile method, which is a low-vibration method and, in electrified sections, is a low-head method that does not touch the overhead wires during driving. When driving the support piles 34 and the track support piles 341, a wooden lining is provided in advance within the driving range of the pile driver so that the pile driver for the support piles 34 and the track support piles 341 can travel to the driving location and a reaction force can be secured, and heavy machinery is driven on top of the lining, or the reaction force from the ground is secured via the wooden lining. Also, the pile driver may be brought in by a road-rail vehicle, or the pile driver installed on the road-rail vehicle may be used to drive the piles. By driving the track support piles 341 in advance, the work of driving the track support piles 341 on the night when the track is switched is eliminated.

[0022] (5.2) Step 2: Temporary platform construction process (Figs. 6 and 7) In the next step, the first support pillar 31 and the second support pillar 32 are added to the support pile 34 driven in the previous step, to construct the temporary gantry 3. The first support pillar 31 and the second support pillar 32 in this embodiment are made of H-shaped steel, like the support pile 34. Furthermore, for the addition of the first support pillar 31 and the second support pillar 32, a method using a conventional splice plate or the like is appropriately used. Then, continuous horizontal members 312, 322 that are continuous in the longitudinal direction of the track are fixed to the upper ends of the first support 31 and the second support 32, respectively, and the lining girder 33 is fixed between the continuous horizontal member 312 on the first support 31 side and the continuous horizontal member 322 on the second support 32 side, and the other transverse horizontal members 311, horizontal members 313, 323, track supporting horizontal members 314, 324, diagonal members 315, etc. are fixed. The continuous horizontal members 312, 322, lining girder 33, transverse horizontal members 311, horizontal members 313, 323, track supporting horizontal members 314, 324, diagonal members 315, etc. are made of steel materials such as H-shaped steel, angles, channels, etc., and are joined and fixed via bolts. In this embodiment, the lining girders 33 are placed on the continuous horizontal members 312, 322 at intervals of 3 m along the length of the track. On top of the lining girders 33 on the second track 2, lining plates 35 are installed as a foothold for a lifting machine required for lifting materials and equipment to be used in the subsequent process, and a work yard 351 with a width of 5 m is constructed. After the covering plate 35 is installed, a fall prevention fence (not shown) is installed at the side end of the covering plate 35, which becomes the work yard 351, to prevent falls.

[0023] (5.3) Step 3: First tentative track construction process After constructing the temporary gantry 3, a first track unit 4a having a first temporary track 41a, which is a temporary track for the first track 1, is fixed to the temporary gantry 3. The first track unit 4a is supported above the construction gauge 11 of the first track 1 by horizontal member 313a located directly below the continuous horizontal member 312 at the upper end of the first support 31, among the horizontal members 313 arranged in multiple stages on the first support 31 (FIGS. 1 and 8).

[0024] (5.3.1) First orbital unit (Fig. 9, Fig. 10) The first track unit 4a includes a first temporary track 41a, which is a temporary track for the first track 1, and a construction girder 42a that supports the first temporary track 41a. The first temporary track 41a is made up of two rails 411a and sleepers 412a supporting the rails 411a. The construction girder 42a is composed of construction cross beams 421a that are perpendicular to the rail 411a and arranged at a predetermined interval in the longitudinal direction of the rail 411a, and construction vertical beams 422a that are arranged on the lower part of the two rails 411a between adjacent construction cross beams 421a and have sleepers 412a arranged between the upper surfaces. Anti-vibration rubber 43a with a thickness of about 10 mm may be arranged between the lower surface of the sleeper 412a and the upper surface of the construction vertical beam 422a to prevent vibrations when a train passes. The construction cross beams 421a and construction vertical beams 422a constituting the construction girder 42a in this embodiment are both H-shaped steel, with the construction cross beams 421a measuring H400×400×13×20 and the construction vertical beams 422a measuring H300×300×10×15. The construction cross beams 421a are arranged at intervals of 6 m. A hook bolt 44a is inserted into the sleeper 412a from below, and the hook bolt 44a is engaged with an upper flange 423a of the construction vertical beam 422a to fix the sleeper 412a. The rail 411a is secured to the tie 412a by a conventional rail fastener (not shown). The first track unit 4a having the first temporary track 41a is constructed in the following procedure.

[0025] (5.3.2) Step 3.1: Temporary assembly of the first track unit First, a first track unit 4a consisting of a first temporary track 41a and a construction girder 42a supporting the first temporary track 41a is temporarily assembled on the ground to confirm whether assembly is possible. In addition, the construction vertical beam 422a and the sleeper 412a are integrated on the ground via a hook bolt 44a.

[0026] (5.3.3) Step 3.2: Bringing in the lifting machine As a lifting machine for lifting the first track unit 4a, for example, a 4.9 ton crane is used, and the first track unit 4a is lifted from the ground using a crane or the like and installed in a work yard 351 formed by installing a covering plate 35 on a covering girder 33. Steps 3.1 and 3.2 can be performed in any order or simultaneously.

[0027] (5.3.4) Step 3.3: Erection of the first track unit First, the construction cross beam 421a of the track unit 4 is installed at a predetermined height and position using a lifting machine. The construction cross beam 421a is fixed to the horizontal member 313a located directly below the continuous horizontal member 312 at the upper end of the first support column 31 of the temporary gantry 3. Next, the construction vertical beam 422a and the sleeper 412a that have been integrated on the ground are lifted up by a lifting machine, and the construction vertical beam 422a is connected to the construction cross beam 421a that has been lifted and fixed earlier. The construction cross beam 421a and the construction vertical beam 422a are connected appropriately using bolts and splice plates. Then, the rail 411a is lifted by a lifting machine and fixed onto the sleepers 412a, and a track unit 4 consisting of a first temporary track 41a and a construction girder 42a supporting it is constructed directly above the first track 1 within the temporary gantry 3.

[0028] (5.3.5) Step 3.4: Fixing the second track side of the first track unit Through the above-mentioned erection process, one of the first track 1 sides of the first track unit 4a is supported by fixing the construction cross beam 421a to the horizontal member 313a on the first support pillar 31 side. The other second track 2 side (the center side of the double track) of the first track unit 4a is connected to and fixed to a girder hoisting device 36 fixed to the covering girder 33. The girder hoist 36 of this embodiment is composed of a girder hoist fitting 361 arranged and fixed to the underside of the lining girder 33 along the length of the track, and a hoist bolt 362 hanging down from the girder hoist fitting 361, and the lower end of the hoist bolt 362 is connected to the construction cross beam 421a (FIG. 11). The lower end of the hoist bolt 362 may be fixed to a hoist fitting 363 provided on the upper surface of the construction cross beam 421a, or may be directly connected and fixed to the construction cross beam 421a.

[0029] (5.3.6) Step 3.5: Suspension of temporary overhead wires The first track unit 4a is fixed above the construction limit 11 of the first track 1, but if it interferes with the current overhead line of the first track 1, a temporary overhead line (temporary temporary overhead line 14) may be attached to the underside of the construction cross beam 421a to switch from the current overhead line (Figure 8). When the temporary overhead wire 14 is not suspended, the track unit 4 does not need to be fixed on the second track 2 side.

[0030] (5.4) Step 4: First temporary track hanging process (Fig. 12, 13) The first track unit 4a is lowered and fixed at a predetermined height, thereby switching the first track 1 to an elevated track. In this embodiment, the first track unit 4a is lowered using the jack 7 arranged on the lining girder 33, so in this process the first track unit 4a is suspended from the jack 7. The jack 7 is a Center Hole Jack (registered trademark), and a PC steel bar, wire, or the like is inserted as a suspension material 71. The lower end of the suspension material 71 is connected to the construction girder 42a of the first track unit 4a.

[0031] (5.4.1) Step 4.1: Carrying in materials / Installing scaffolding and covering boards The materials and equipment used in this process are lifted from the ground using a crane or the like and transported to the work yard 351 on the second track 2. Then, to ensure that work can be carried out safely and to prevent materials and equipment from falling through the openings in the temporary platform 3, scaffolding boards 37 are laid on the construction girders of the first track unit 4a. Thereafter, the jack 7 for lowering the first track unit 4a and the lining plate 35 serving as a foothold for the jack 7 and its support 72 are installed on the lining girder 33 on the first track 1.

[0032] (5.4.2) Step 4.2: Install the jack A jack 7 and its support 72 for lowering the first track unit 4a are installed on the lining girder 33 and lining plate 35 on the first track 1. In this embodiment, the support 72 is formed by assembling steel members in a grid shape when viewed from above. The installation positions of the receiving base 72 and the jack 7 are set to match the position where the lower end of the hanging member 71 is connected to the construction girder of the first track unit 4a. Two channels (380x100x13x20) are installed in the length direction of the first track 1 between the two lining girders 33 of the temporary girders 3 on the first stage steel material 721 of the support 72. In step 4.1, the lining plate 35 is installed with a gap secured to allow the first stage steel material 721 to be installed. Then, two H-shaped steel pieces (H300x300x10x15) are installed on the first stage steel material 721 in a direction perpendicular to the first track 1 as the second stage steel material 722 to construct a support 72 for the jack 7, and the jack 7 is installed on top of that.

[0033] (5.4.3) Step 4.3: Suspension of the first track unit After the jack 7 is installed, the suspension material 71 is inserted from above the jack 7 toward the construction girder 42a of the first track unit 4a, and the lower end of the suspension material 71 is connected and fixed to the construction cross girder 421a. As a result, the first track unit 4a is suspended and connected to the jack 7 on the temporary gantry 3 via the suspension material 71.

[0034] (5.4.4) Step 4.4: Temporary line installation A temporary overhead line 45a, which will be the overhead line of the first elevated line after the switchover, is installed under the covering girder 33 of the temporary platform 3 (FIG. 12). This procedure up to 4.4 is performed by the night when the first track unit 4a is lowered to switch to the first elevated line. By installing the temporary overhead line 45a in advance, the overhead line work on the night when the line is switched to the first elevated line can be reduced to only switching on the ground side outside the lowering work area, and the simultaneous work of track switching work and electrical work for switching the overhead line can be reduced, improving safety.

[0035] (5.5) Step 5: Construction of the first line of the single-track elevated structure (Fig. 14, 15) After the first track 1 is closed, the first track unit 4a suspended from the temporary gantry 3 is lowered and fixed at a predetermined height, thereby switching the single track of the first track 1 of the double track to an elevated track. The first elevated line is the first track 1 converted into an elevated line, and the construction process will be carried out as follows:

[0036] (5.5.1) Step 5.1: Installing track supports After the track is closed, the track support members 38 are installed on the track support piles 341 that have been driven in beforehand, and the track support girders 382 are arranged on the tops of the track support pillars 381 in the longitudinal direction of the first track 1 and directly support the first track unit 4a (FIG. 16). The height of the track support girders 382 is set to be the same as the height of the track support horizontal members 314. Since the track support material 38 falls within the construction limit 11 of the first track 1, it is assembled together on the ground in advance and then transported and installed from the second track 2 using, for example, a 2-ton Unic or the like.

[0037] (5.5.2) Step 5.2: Removal of horizontal members The first track unit 4 a is connected to a jack 7 on the temporary platform 3 via a hanging member 71 at the step 4 . In order to lower the first track unit 4a to the height of the track supporting horizontal member 314, the first track unit 4a suspended by the jack 7 is detached from the uppermost horizontal member 313a, and the horizontal member 313b between this horizontal member 313a and the track supporting horizontal member 314 is removed. If a chain block, scaffolding, or the like is required to remove the horizontal member 313, it is installed in advance of this procedure. Furthermore, in the case where the second track 2 side of the first track unit 4a is fixed, the hanging bolts 362 that fix it are removed. Steps 5.1 and 5.2 can be performed in any order or simultaneously.

[0038] (5.5.3) Step 5.3: Stop power supply and remove overhead lines After stopping the power supply and confirming that it is possible, remove the temporary overhead wire 14 of the first track 1 that is interfering with the descent of the first track unit 4a, or the current overhead wire if the temporary overhead wire 14 is not suspended. The removal of the temporary overhead wire 14 or the current overhead wire can be performed even during the work of steps 5.1 and 5.2.

[0039] (5.5.4) Step 5.4: First orbital unit lowered and fixed After steps 5.1 to 5.3 are completed, operate the jack 7 to lower the first track unit 4a. Once the first track unit 4a is in the designated position, the construction cross beam 421a of the first track unit 4a is fixed to the track support horizontal member 324 on the first pillar 31 side of the temporary platform 3 and to the track support member 38 installed in step 5.1.

[0040] (5.5.5) Step 5.5: Recovery Procedure Once the first track unit 4a is fixed, the following recovery work is carried out. (i) Track connections In this embodiment, one side of the first track unit 4a is connected to the track of the viaduct 5 constructed by the temporary line construction method, and the other side is connected to the conventional main line 6 (Fig. 17). At this time, since the conventional main line 6 is on the ground, the track on the ground side is lifted and connected to the first track unit 4a.

[0041] (ii) Removal of hanging materials If the hanging member 71 used to lower the first track unit 4a interferes with the construction gauge 15 of the elevated first track line after switching, the hanging member 71 is removed. The jack that was suspending the hanging member 71 is removed as necessary.

[0042] (iii) Restoration of horizontal members The horizontal members 313 removed from the temporary platform 3 in step 5.2 are to be restored starting from the bottom.

[0043] (iv) Until the end of work After the above-mentioned restoration work is completed, cleaning up and inspections are carried out, the power outage ends, the track closure is lifted, and the first power is confirmed. The night's work is completed when the first track unit 4a is lowered and switched to the elevated first line. In addition, since the temporary overhead line 45a, which will be the overhead line of the first elevated line, has been installed in advance in step 4, no overhead line restoration work is required in this process.

[0044] (5.6) Step 6: Second temporary track construction process (Fig. 18, 19) After the first elevated line is constructed, a second track unit 4b having a second temporary track 41b, which is a temporary track for the second track 2, is fixed to the temporary gantry 3. The second track unit 4b is supported above the construction gauge 21 of the second track 2 and the construction gauge 15 of the track of the first elevated line by horizontal member 323a located directly below the continuous horizontal member 322 at the upper end of the second support 32, among the horizontal members 323 arranged in multiple stages on the second support 32. In this embodiment, the second orbital unit 4b is configured to have the same shape as the first orbital unit 4a. The second orbital unit 4b is constructed by the following procedure.

[0045] (5.6.1) Step 6.1: Re-arranging in the work yard Since the work yard 351 on the second track 2 used until the construction of the first elevated line is an obstacle to the lifting work of the second track unit 4b, the work yard 351 is reconstructed by moving the covering plate 35 onto the covering girder 33 on the first elevated line. After the covering plate 35 is installed, a fall prevention fence (not shown) is installed on the side end of the covering plate 35 that will become the work yard 351 to prevent falls, as in step 2.

[0046] (5.6.2) Step 6.2: Temporary assembly of the second track unit - Erection of the second track unit Procedures similar to those of procedures 3.1 to 3.3 in step 3 are carried out for the second track 2 side and the second track unit 4b, and the second track unit 4b is fixed to the horizontal member 323a of the second support 32 and erected on the temporary gantry 3.

[0047] (5.6.3) Step 6.3: Main support for the first elevated track In parallel with steps 6.1 and 6.2, the first track 1 located under the first elevated line is removed, the framework of the viaduct 8 on the first line side that will be the permanent structure is constructed, and slab concrete is poured to match the first track unit 4a to permanently support the first temporary track 41a. At this time, since the construction cross beam 421a of the first track unit 4a corresponds to the position of the parapet of the viaduct 8, that part may be boxed out, the framework may be constructed, and the first temporary track 41a may be permanently supported, after which the construction cross beam 421a may be removed and the boxed out part may be filled in, or the construction cross beam 421a may be cut later as a dead frame.

[0048] (5.7) Step 7: Second temporary track hanging process The second track unit 4b having the second temporary track 41b is lowered and fixed at a predetermined height, thereby switching the second track 2 to an elevated track. In this embodiment, a process similar to the process of suspending the first track unit 4a with the jacks 7 performed in step 4 is performed, and the second track unit 4b is suspended from the jacks 7 provided in the work yard 351 on the second track 2.

[0049] (5.8) Step 8: Construction of the single-track elevated second line (Fig. 20, 21) After the second track 2 is closed, the second track unit 4b suspended from the temporary gantry 3 is lowered and fixed at a predetermined height, thereby switching the single track of the second track 2 out of the double track to an elevated track. The second elevated line will be constructed by converting the second track 2 into an elevated line, using the same process as step 5 used to construct the first elevated line. However, since the track support material 38 that supports the first track 1 side of the second track unit 4b is installed in procedure 5.1 of step 5, the installation process of the track support material 38 is not included in step 8.

[0050] (5.9) Step 9: Main support for the second elevated track (Fig. 22) After the second elevated line is constructed, the second track 2 located under the second elevated line is removed, the framework of the viaduct 8 on the second line side that will be the permanent structure is constructed, and slab concrete is poured to match the second track unit 4b to permanently support the second temporary track 41b. At this time, since the construction cross beam 421b of the second track unit 4b corresponds to the position of the parapet of the viaduct 8, that part may be boxed out, the framework may be constructed, and the second temporary track 41b may be permanently supported, after which the construction cross beam 421b may be removed and the boxed out part may be filled in, or the construction cross beam 421b may be cut later as a dead frame. In addition, the main support of the elevated first line in step 6.3 of the above-mentioned step 6 can also be performed simultaneously with the main support of the elevated second line in this process.

[0051] (5.10) Step 10: Install permanent wiring and remove temporary platform Once the replacement of both the first track 1 and the second track 2 with the viaduct 8, which will be the permanent structure, is completed, the permanent overhead line poles are erected, the permanent overhead lines are installed, and the temporary platform 3 is removed. After step 9 is completed, since the temporary overhead lines 45a for the first elevated line and the second elevated line have been installed on the covering girder 33 of the temporary platform 3, first, part of the temporary platform 3 is removed except for the first support pillar 31, the second support pillar 32, etc., which are necessary to support these temporary overhead lines 45a. Thereafter, a permanent overhead line pole is erected and the permanent overhead line is installed, the temporary overhead line 45a is removed, and the temporary platform 3 that supported the temporary overhead line 45a is removed, completing the construction.

[0052] (6) Sections where the single track vertical elevation construction method is applied and the height of the temporary platform (Figure 17) The single track straight elevated construction method of this embodiment is applied to the section between the section where the temporary line construction method can be carried out and the main line section, where the temporary line construction method cannot be carried out. The height of the lifting by the single track straight elevated construction method increases as the viaduct 5 constructed by the temporary line construction method is approached, so the height of the temporary girders 3 also increases. On the other hand, the height of the lifting decreases as the main line 6 is approached. In this embodiment, the lowered track unit 4 is supported by the track support material 38, but if the lifting height is low, the track bed or roadbed can be lifted on the same night to support the track unit 4. In addition, in a section where the lifting height is low (for example, 300 mm or less), instead of lowering the track unit 4 suspended from the temporary girders 3, the track (first track 1) can be removed in advance and the track unit 4 (first track unit 4a) can be installed on the same night as the track (first track 1), and the installed track unit 4 (first track unit 4a) can be lifted on the same night as the lifting (step 5).

[0053] [Example 2] (1) Single-track vertical elevation construction method using sleeper-embracing construction girders In the single-track straight-above elevated construction method of Example 1, the construction girder that supports the first temporary track 41a of the first track unit 4a is constructed by combining a construction cross girder 421a fixed to the first support 31 and construction vertical girder 422a that is respectively placed on the lower part of the two rails 411a between the construction cross girder 421a, but it can also be constructed using a sleeper-embracing type construction girder. The first track unit 4a at this time is composed of two rails 411a, a construction vertical beam 422a arranged along the rail 411a, and a sleeper cross beam 424a including a sleeper 412a that is arranged between the construction vertical beams 422a so as to be perpendicular to the rail 411a and supports the rail 411a. Note that the first track unit 4a is not limited to this form, and a conventionally used sleeper embracing construction beam can be used as appropriate.

[0054] (2) Each step of the single track vertical elevation construction method using sleeper-embracing construction girders The single track vertically elevated construction method of the present invention in this embodiment comprises the following steps. Note that, unless otherwise specified, each step is the same as the single track vertically elevated construction method of Example 1.

[0055] (2.1) Step 1: Support pile installation process (Figure 23) As in the first embodiment, in the first step, the support piles 34 for supporting the temporary gantry 3 and the track support piles 341 for supporting new track units 4 when the track is elevated are driven in. The support piles 34 for the temporary platform 3 are driven outside both the construction limits 11 and 21 of the first track 1 and the second track 2. Since the first track unit 4a in this embodiment is a sleeper-embracing construction girder, both sides of the first track unit 4a in the direction perpendicular to the rail 411a are supported by track support piles 341. For this reason, the track support piles 341 are driven below the construction gauge 11 of the first track 1, which is to be first elevated as a single track, and outside the construction gauge 21 of the second track 2, at a predetermined interval in the track direction of the first track 1, so that they are paired on both sides of the first track 1 symmetrically with respect to the center line of the pair of rails of the first track 1. In this embodiment, in order to construct the columns of the permanent viaduct 8 at intervals of 6 m in the track direction in a later process, a total of four track support piles 341 are driven in between, two rows in the track direction and two rows perpendicular to the track. In addition, if the second track unit 4b is also a sleeper-embracing type construction girder, track support piles 341 are also driven below the construction gauge 21 of the second track 2. At this time, the sleepers 12, 22 that interfere with the track support piles 341 that support the track unit 4 are replaced in advance with the temporary sleepers 13, 23, as in the first embodiment. Also, the track support piles 341 are cut near the top ends of the sleepers so as not to interfere with the construction gauge. If the first elevated track main support is carried out before the second elevated track main support in step 9, the excavation work required to construct the permanent viaduct 8 will be carried out on the first track 1 side first, without waiting for the temporary support of the second track 2, resulting in a difference in ground surface height after excavation. In this state, to prevent the second track 2 from sinking and allow trains to pass safely, retaining piles 39 can also be constructed at the same time so that a retaining wall can be installed between the first track 1 and the second track 2.

[0056] (2.2) Step 2: Temporary platform construction process (Figure 24) In the next step, the first support pillars 31 and the second support pillars 32 are added to the support piles 34 driven in the previous step to construct the temporary gantry 3. Note that in this embodiment, the elevated first track 1 and second track 2 are not supported by the first support pillars 31 and the second support pillars 32, but track support horizontal members 314, 424 that serve both as reinforcement and track support may be placed on the temporary gantry 3 if necessary against loads during construction or earthquakes. In this embodiment, the track unit 4 is directly supported by the track support piles 34, and therefore a track support plate 383 is fixed to the upper end of the track support piles 34.

[0057] (2.3) Step 3: First tentative track construction process After the temporary gantry 3 is constructed, a first track unit 4a having a first temporary track 41a, which is a temporary track of the first track 1, is constructed. The first orbital unit 4a is constructed on the ground. In addition, a lifting machine for lifting the first track unit 4a is installed in the work yard 351. The first track unit 4a is lifted by a temporary platform 3 from directly above the first track 1 to directly below the lining girder 33, and fixed to the lining girder 33 via a girder lifting fitting 361 (FIG. 25). The first track unit 4a is fixed above the construction limit 11 of the first track 1, but if it interferes with the current overhead line of the first track 1, a temporary overhead line (temporary temporary overhead line 14) for the current overhead line of the first track 1 may be attached to the underside of the first track unit 4a to switch from the current overhead line.

[0058] (2.4) Step 4: First temporary track hanging process (Figure 26) The first track unit 4a having the first temporary track 41a constructed on the ground is suspended directly above the first track 1 by a temporary gantry 3, and then lowered and fixed at a predetermined height, thereby converting the first track 1 into an elevated track.

[0059] (2.4.1) Step 4.1: Material delivery / covering plate installation The materials and equipment used in this process are lifted from the ground using a crane or the like and transported to the work yard 351 on the second track 2.

[0060] (2.4.2) Step 4.2: Install the jack A jack 7 and its support 72 for suspending and lowering the first track unit 4a are installed on the lining girder 33 and lining plate 35 on the first track 1.

[0061] (2.4.3) Step 4.3: Suspension of the first track unit The hanging member 71 is inserted from above the jack 7 toward the first track unit 4a, and the lower end of the hanging member 71 is connected and fixed to the construction vertical beam 422a of the first track unit 4a. As a result, the first track unit 4a is suspended and connected to the jack 7 on the temporary gantry 3 via the suspension material 71.

[0062] (2.4.4) Step 4.4: Temporary line installation A temporary overhead line 45a, which will become the overhead line of the first elevated line after the switchover, is installed under the covering girder 33 of the temporary platform 3. This procedure up to 4.4 should be completed by the night when the first track unit 4a is lowered and switched to the elevated first line.

[0063] (2.5) Step 5: Construction of the first line of the single-track elevated structure (Figure 27) After the first track 1 is closed, the first track unit 4a suspended from the temporary gantry 3 is lowered and fixed at a predetermined height, thereby switching the single track of the first track 1 of the double track to an elevated track.

[0064] (2.5.1) Step 5.1: Installing track supports After the track is closed, a track support pillar 381 protruding from the track support pile 341 is installed on the track support pile 341 that was previously driven into the ground. However, if the amount of lift of the first elevated line to be constructed from the current first track 1 is small, it may be sufficient to support the first track unit 4a with track support piles 341 that fall outside the construction limit 11 of the first track 1, in which case the installation of the track support columns 381 will not be necessary. Furthermore, since the first track unit 4a is not fixed to the first support 31, the horizontal member 313 does not interfere when it is lowered, and therefore the horizontal member removal step of the first embodiment is not necessary.

[0065] (2.5.2) Step 5.2: Stopping power supply, removing overhead lines and rails After stopping the power supply and confirming that it is possible, remove the temporary overhead wire 14 of the first track 1 that is interfering with the descent of the first track unit 4a, or the current overhead wire if the temporary overhead wire 14 is not suspended. The removal of the temporary overhead wire 14 or the current overhead wire can be performed even during the work of step 5.1. In addition, the rails of the first track 1 are removed before the first track unit 4a is lowered.

[0066] (2.5.3) Step 5.3: First orbital unit lowered and fixed After steps 5.1 and 5.2 are completed, the jacks 7 are operated to lower the first track unit 4a over the entire section and fix it to the track support plate 383 on the track support piles 341.

[0067] (2.5.4) Step 5.4: Recovery Procedure Once the first track unit 4a is fixed, the recovery work is carried out in the same manner as in the first embodiment. In this embodiment, since the horizontal members 313 of the temporary gantry 3 are not removed, there is no need to restore the horizontal members 313.

[0068] (2.6) Step 6: Second temporary track construction process (Figure 28) After the first elevated line is constructed, a second track unit 4b having a second temporary track 41b, which is a temporary track of the second track 2, is constructed in the same manner as the first track unit 4a. The second track unit 4b is constructed on the ground and suspended from the temporary gantry 3 in the next step, but before that, as in the first embodiment, the work yard 351 on the second track 2 used for the construction of the first elevated line is moved to the top of the first line and prepared. At the same time, the first track 1 located under the first elevated line is removed, the framework of the viaduct 8 on the first line side, which will be the permanent structure, is constructed, and slab concrete is poured to match the first track unit 4a to permanently support the first temporary track 41a. Since the first track unit 4a in this embodiment does not have the construction cross beam 421a, there is no process of cutting the construction cross beam 421a after removing the box or burying it in the ground when constructing the framework of the permanent viaduct 8. On the other hand, by removing the first track 1 and its trackbed and roadbed directly below the first temporary track 41a, the track support piles 34 are exposed, and the effective slenderness ratio of the track support piles 34 increases, and the bending moment acting on the pile head also increases. For this reason, if necessary, in order to resist this, the piles are connected using two rows of vertical temporary track joints 384 in the track direction (total of four), and one row of horizontal temporary track joints 385 in the track cross direction (total of two) (Figure 29). Furthermore, the track support piles 34 located diagonally may be connected by angle irons or the like.

[0069] (2.7) Step 7: Second temporary track hanging process (Figure 28) The second track unit 4b having the second temporary track 41b constructed on the ground is suspended directly above the second track 2 on a temporary gantry 3, and then lowered and fixed at a predetermined height, thereby converting the second track 2 into an elevated track. In this embodiment, the same processes as those of fixing the first track unit 4a and suspending it with the jack 7 performed in steps 3 and 4 are performed, and the second track unit 4b is suspended from the jack 7 provided in the work yard 351 on the second track 2.

[0070] (2.8) Step 8: Construction of the single-track elevated second line (Figure 30) After the second track 2 is closed, the second track unit 4b suspended from the temporary gantry 3 is lowered and fixed at a predetermined height, thereby switching the single track of the second track 2 out of the double track to an elevated track. The second elevated line will be constructed using the same process as step 5, which constructed the first elevated line.

[0071] (2.9) Step 9: Main receiving section for the second elevated track After the second elevated line is constructed, the second track 2 located under the second elevated line is removed, the skeleton of the viaduct 8 on the second line side, which will be the permanent structure, is constructed, and slab concrete is poured to match the second track unit 4b to permanently support the second temporary track 41b. Since the second track unit 4b in this embodiment does not have the construction cross beam 421b, when constructing the skeleton of the permanent viaduct 8, there is no need to perform a process of cutting the construction cross beam 421a after removing the box or burying it. Also, similarly to step 9, temporary vertical track joints 384, temporary horizontal track joints 385, etc. are provided between the track support piles 34 as necessary. In addition, the above-mentioned step 6 of the main support of the first elevated line can also be performed simultaneously with the main support of the second elevated line in this process.

[0072] (2.10) Step 10: Install permanent wiring and remove temporary platform Once the replacement of both the first track 1 and the second track 2 with the viaduct 8, which will be the permanent structure, is completed, the permanent overhead line poles are erected and the permanent overhead lines are installed, the temporary platform 3 is removed, and the construction is completed.

[0073] [Example 3] (1) Single-track vertical elevation construction method by lifting the track In both the single track straight up elevated construction methods of the first and second embodiments, a new track unit 4 placed at the top of a temporary structure 3 is lowered to elevate the track, but in this embodiment, the current first track 1 is raised to elevate the track on the first track 1 side.

[0074] (2) Each step of the single track vertical elevated construction method by lifting the track The single track directly overhead elevated construction method of the present invention in this embodiment comprises the following steps. Note that, unless otherwise specified, each step is the same as the single track directly overhead elevated construction method of Examples 1 and 2.

[0075] (2.1) Step 1: Support pile installation process (Figure 31) As in the first and second embodiments, in the first step, the support piles 34 for supporting the temporary platform 3, the track support piles 341 for supporting the track when elevating the track, and the retaining piles 39 required for excavating the side of the first track 1 are driven. The support piles 34 for the temporary platform 3 are driven outside both the construction limits 11 and 21 of the first track 1 and the second track 2. The track support piles 341 are driven below the construction gauge 11 of the first track 1, which will be first elevated as a single track, and outside the construction gauge 21 of the second track 2. If the first track 1 and the second track 2 are close to each other, the retaining piles 39 may be installed below the construction limit 12 of the second track 2 so that excavation can be performed to a position that does not interfere with the installation of the first track unit 4a.

[0076] (2.2) Step 2: Temporary platform construction process In the next step, the first support pillar 31 and the second support pillar 32 are added to the support piles 34 driven in the previous step, and the temporary platform 3 is constructed. In addition, the support for the overhead wire of the first track 1 may be changed from the overhead wire pole to a bracket 331 installed at the lower part of the covering girder 33 of the temporary gantry 3, and a temporary overhead wire 14 may be provided up to the lifting point.

[0077] (2.3) Step 3: First temporary track construction process (Figure 33) After removing the first track 1 in the order of rails, rail fastening devices (not shown), and sleepers, the ballast and roadbed are excavated and removed. Thereafter, the track supporting horizontal member 314 is installed on the support pile 34 directly below the first pillar 31 and the track supporting pile 341. Then, the first track unit 4a is installed on the track supporting horizontal member 314. The installation of the first track unit may be performed by first placing the construction girder 42a on the track supporting horizontal member 314 and then installing the sleepers 412a and the rails 411a in that order, or the construction girder 42a, sleepers 412a, and rails 411a may be assembled first to construct the first track unit 4a and then installing it on the track supporting horizontal member 314.

[0078] (2.4) Step 4: First temporary track hanging process (Figure 33) The first track unit 4a formed by replacing the first track 1 is suspended from the temporary gantry 3, and then lifted up and fixed at a predetermined height, thereby switching the first track 1 to an elevated track. The first track unit 4a is suspended using jacks 7 placed on the lining girder 33 and then lifted, so in this process the first track unit 4a is first suspended from the jacks 7.

[0079] (2.4.1) Step 4.1: Carrying in materials / Installing scaffolding and covering boards The materials and equipment used in this process are lifted from the ground using a crane or the like and transported to the work yard 351 on the second track 2. Then, the jack 7 for suspending and lifting the first track unit 4a and the covering plate 35 serving as a foothold for its support 72 are installed on the covering girder 33 on the first track 1.

[0080] (2.4.2) Step 4.2: Install the jack A jack 7 and its support 72 for suspending and lifting the first track unit 4a are installed on the lining girder 33 and lining plate 35 on the first track 1.

[0081] (2.4.3) Step 4.3: Temporary line installation A temporary overhead line 45a, which will become the overhead line of the first elevated line after the switchover, is installed under the covering girder 33 of the temporary platform 3. This procedure up to 4.3 should be completed by the night when the first track unit 4a is raised and switched to the elevated first line.

[0082] (2.4.4) Step 4.4: Suspension of the first track unit 4a After the track is closed, the suspension material 71 is inserted from above the jack 7 toward the construction girder of the first track unit 4a, and the construction cross girder 421a and the lower end of the suspension material 71 are connected and fixed. Note that the suspension of the first support column 31 side of the temporary gantry 3 can also be performed in advance before the track is closed.

[0083] (2.5) Step 5: Construction of the first line of the single-track elevated structure (Figure 34) After the first track 1 is closed, the first track unit 4a suspended from the temporary girding 3 is lifted and fixed at a predetermined height, thereby switching the single track of the first track 1 of the double track to an elevated track. The construction process for the first elevated line will be as follows:

[0084] (2.5.1) Step 5.1: Stop power supply and remove overhead lines Power supply will be stopped, and once this has been confirmed, the current overhead lines will be removed.

[0085] (2.5.2) Step 5.2: Lifting and fixing the first track unit The jack 7 is operated to lift the first track unit 4a. On the track support piles 341 that have been driven in beforehand, a track support material 38 is installed, which consists of a track support pillar 381 that protrudes from the track support piles 341 as necessary, and a track support girder 382 that is arranged in the longitudinal direction of the first track 1 on the top of the track support pillar 381 and directly supports the first track unit 4a. In addition, a track support horizontal member 314 that supports the first track unit 4a is installed on the first support pillar 31 of the temporary gantry 3. Note that if the track support girder 382 is below the construction gauge of the first track 1, the track support girder 382 may be installed directly on the track support piles 341. Then, the first track unit 4 a lifted by the jack 7 is fixed to the track support horizontal member 314 and the track support girder 382 .

[0086] (2.5.3) Step 5.3: Recovery Procedure Once the first track unit 4a is fixed, recovery work is carried out in the same manner as in the first and second embodiments. In this embodiment, since the horizontal members 313 of the temporary gantry 3 are not removed, there is no need to restore the horizontal members 313.

[0087] (2.6) Step 6: Second temporary track construction process (Figure 35) After constructing the elevated first line, the second track unit 4b having the second temporary track 41b, which is a temporary track for the second track 2, is fixed to the temporary gantry 3 through a process similar to that in step 6 of the first embodiment. Also, similar to procedure 6.3 in step 6 of the first embodiment, the first track 1 located under the elevated first line is removed, and the framework of the viaduct 8 on the first line side, which will be the permanent structure, is constructed to permanently support the first temporary track 41a.

[0088] (2.7) Step 7: Second temporary track hanging process The second track unit 4b is lowered and fixed at a predetermined height, thereby switching the second track 2 to an elevated track. In this embodiment, a process similar to step 7 in the first embodiment is performed, and the second track unit 4b is suspended from a jack 7 provided in a work yard 351 on the second track 2.

[0089] (2.8) Step 8: Construction of the single-track elevated second line (Figure 36) After the second track 2 is closed, the second track unit 4b suspended from the temporary gantry 3 is lowered and fixed at a predetermined height, thereby switching the single track of the second track 2 out of the double track to an elevated track. In this embodiment, a process similar to step 8 in the first embodiment is carried out to switch the second track 2 to an elevated track, thereby constructing a second elevated track.

[0090] (2.9) Step 9: Main receiving section for the second elevated track After the construction of the second elevated line, the framework of the viaduct 8 on the second line side, which will be the permanent structure, is constructed under the second elevated line, and slab concrete is poured to match the second track unit 4b to permanently support the second temporary track 41b. Note that the above-mentioned step 6 of permanently supporting the first elevated line can also be performed simultaneously with the permanent support of the second elevated line in this process.

[0091] (2.10) Step 10: Install permanent wiring and remove temporary platform Once the replacement of both the first track 1 and the second track 2 with the viaduct 8, which will be the permanent structure, is completed, the permanent overhead line poles are erected and the permanent overhead lines are installed, the temporary platform 3 is removed, and the construction is completed.

[0092] [Example 4] In the above-mentioned first to third embodiments, the single-track directly elevated construction method of the present invention has been described, but in the present embodiment, a railway section elevated construction method using the single-track directly elevated construction method will be described.

[0093] (1) Overview of the elevated railway section construction method (Figure 37) The railway section elevation method of the present invention elevates a railway in a section that has existing land where two double tracks, a first line 91 and a second line 92, run parallel to each other. Conventional temporary line methods require securing temporary line land 93 for the entire section to be elevated, but in this embodiment, a temporary line section 94 where temporary line land 93 can be secured to the side of the second line 92 and a temporary line unsecured section 95 where temporary line land 93 cannot be secured due to an obstructing building 951 are both elevated. The temporary line unsecured section 95 is connected to the main line 96.

[0094] (2) Each step of the railway section elevated construction method The railway section elevated construction method of the present invention comprises the following steps.

[0095] (2.1) Temporary line section Second line temporary line construction process (Figure 38) A temporary second line 921, which is a temporary version of the existing second line 92, is installed on temporary line land 93 secured through land acquisition, etc., and the existing second line 92 in the temporary line section 94 is switched to the temporary second line 921.

[0096] (2.2) Temporary Track Section First Line Temporary Track Construction Process (Figure 39) The second line 92 in the temporary line section 94 where a temporary second line 921 has been installed is removed, and a temporary first line 911, which is a temporary line for the existing first line 91, is installed on the temporary line land 93 side of the second line 92, and the existing first line 91 in the temporary line section 94 is switched to the temporary first line 911.

[0097] (2.3) First line elevation process for the temporary track section (Figure 40) The first line 91 of the temporary line section 94, where a temporary first line 911 has been installed, will be removed, and combined with the land from which the second line 92 has been removed, a permanent first line viaduct 912 will be constructed on the portion of the removed first line 91, thereby elevating the first line 91 of the temporary line section 94.

[0098] (2.4) First Line Elevated Connection Project (Figure 41) The first line 91 in the temporary line unavailable section 95 is elevated by carrying out steps 1 to 3 of the single line direct elevation construction method of the present invention to construct a first line elevated section 913, which is then connected to the first line viaduct 912 in the temporary line section 94. Note that steps 1 to 3 can be carried out simultaneously with the steps up to the temporary line section first line elevation process.

[0099] (2.5) Elevation process for the second line of the temporary track section (Figure 42) The temporary first line 911 will be removed and a permanent second line viaduct 922 will be constructed on the removed second line 91 section, thereby elevating the second line 92 in the temporary line section 94.

[0100] (2.6) Second Line Elevated Connection Project (Figure 43) The second line 92 in the temporary line unavailable section 95 is elevated by carrying out steps 6 to 8 of Examples 1 to 3 of the single track direct elevation construction method of the present invention to construct a second line single track elevated section 923, which is then connected to the second line viaduct 922 in the temporary line section 94. After the connection, the temporary second line 921 is removed.

[0101] (2.7) Construction of elevated sections where temporary tracks are not possible A viaduct skeleton, which will be a permanent structure, is constructed under the first line single track elevated section 913 and the second line single track elevated section 923 that have been elevated in the temporary line unavailable section 95, and the first line single track elevated section 913 and the second line single track elevated section 923 in the temporary line unavailable section 95 are fully supported (step 9 in Examples 1 to 3). Note that the fully supported first line single track elevated section 913 in the temporary line unavailable section 95 (procedure 6.3 of step 6 in Examples 1 to 3) can be performed simultaneously with the temporary line section second line elevated process and the second line elevated connection process. Then, once the replacement of both the first line single track elevated section 913 and the second line single track elevated section 923 with the permanent viaduct in the temporary line unavailable section 95 has been completed, the permanent overhead line poles are erected, the permanent overhead lines are installed, and the temporary platform 3 is removed, completing the construction (Step 10 in Examples 1 to 3).

[0102] In this way, by elevating only the section 95 where the temporary line is not possible with a single track directly above the obstructing building 951, it is possible to combine this with the temporary line construction method, thereby reducing construction costs compared to constructing an elevated section directly above the entire section. In addition, construction can begin without waiting for land acquisition for the 951 obstructing buildings, allowing the elevation project to be completed early. [Explanation of symbols]

[0103] 1 First track, 11 Construction gauge, 12 Sleeper, 13 Temporary sleeper, 14 Temporary overhead line, 2 Second track, 21 Construction gauge, 22 Sleeper, 23 Temporary sleeper, 24 Temporary overhead line, 3 Temporary platform, 31 First support, 32 Second support, 33 Covering girder, 34 Support pile, 35 Covering plate, 36 Girder hoisting device, 37 Scaffolding board, 38 Track support material, 4 track unit, 4a first track unit, 41a first temporary track, 42a construction girder, 43a vibration-proof rubber, 44a hook bolt, 45a temporary overhead line, 4b second track unit, 5 viaduct, 6 lines, 7 Jack, 71 Hanging material, 72 Support, 8 viaduct 91 First Line, 911 Temporary First Line, 912 First Line Viaduct, 913 First Line Single Track Viaduct, 92 Second line, 921 Temporary second line, 922 Second line viaduct, 923 Second line single track viaduct, 93 Temporary line site, 94 Temporary track section, 95 Sections that cannot be made into temporary tracks, 951 Obstructing buildings, 96 Main Line

Claims

1. This is a single track direct elevated construction method that elevates two parallel tracks one by one. (1) A support pile driving process for driving a first support pile that is outside the construction limit of one of the tracks and is arranged on the opposite side of the other track, and a second support pile that is outside the construction limit of the other track and is arranged on the opposite side of the one of the tracks; (2) A temporary support construction process for constructing a temporary support having a first support pillar that is connected to the first support pile, a second support pillar that is connected to the second support pile, and a lining girder that is disposed between the upper portion of the first support pillar and the upper portion of the second support pillar; (3) a first provisional track construction step of disposing a first track unit having a provisional track of one of the tracks at an upper portion thereof above one of the tracks; (4) a first temporary track suspending step of suspending the first track unit from the temporary gantry; (5) a single-track elevated first track construction process of lowering the first track unit suspended from the temporary gantry to switch one of the tracks to the temporary track above the first track unit; (6) a second provisional track construction step of disposing a second track unit having a provisional track of the other track on an upper portion thereof above the other track; (7) a second temporary track suspending step of suspending the second track unit from the temporary gantry; (8) A single-track elevated second line construction step of lowering the second track unit and switching the other track to the temporary track above the second track unit. Single track straight elevated construction method.

2. In the step (1), an intermediate support pile is driven below the construction gauge of one of the tracks and outside the construction gauge of the other track; In the step (5), the first track unit is supported by the first support pillar and an intermediate support pillar that is added to the intermediate support pile, In the step (8), the second track unit is supported by the second support column and the intermediate support column. The method for constructing a single track directly above a railway line according to claim 1.

3. In the (4) step, a jack is placed on the upper part of the lining girder, and a hanging member is inserted into the jack and fixed at its lower end to the first track unit. In the step (5), the first track unit is lowered via the jack and the hanging member. The single track direct elevated construction method according to claim 2.

4. In the (7) step, a jack is placed on the upper part of the lining girder, and a hanging member is inserted into the jack and fixed at its lower end to the second track unit, In the step (8), the second track unit is lowered via the jack and the hanging member. The method for constructing a single track directly above a railway line according to claim 3.

5. The first track unit has a first construction cross beam perpendicular to one of the tracks, In the step (3), the first construction cross beam is connected to and supported by the first support column of the temporary gantry; The single track straight elevated construction method according to claim 4, characterized in that in the step (5), the first construction cross girder is connected to and supported by the first support column of the temporary gantry.

6. The second track unit has a second construction cross beam perpendicular to the other track, In the (6) step, the second construction cross beam is connected to and supported by the second support column of the temporary gantry; The single track straight elevated construction method according to claim 5, characterized in that in the step (8), the second construction cross girder is connected to and supported by the second support column of the temporary structure.

7. The single track straight elevated construction method according to claim 4, characterized in that at least a part of the first track unit and / or the second track unit is made of a sleeper-embracing type construction girder.

8. In the first temporary track construction step, a part of the first track unit is installed at the same height as the other track unit by removing one of the tracks, 2. The single-track elevated construction method according to claim 1, wherein in the single-track elevated first line construction step, a part of the first track unit is lifted and switched to the temporary track.

9. A railway section elevation method for a section having existing land where two tracks run parallel to each other, in which at least one temporary line section can be secured on the side of either of the tracks, and a temporary line unavailable section where the land cannot be secured, and for which the temporary line unavailable section is connected to a main line, Of the parallel tracks, the track farther from the temporary line site is designated as a first track, and the track closer to the temporary line site is designated as a second track; A second line temporary line process of installing a second temporary line, which is a temporary line of the existing second line in the temporary line section, on the temporary line site and switching the existing second line in the temporary line section to the second temporary line; A first line temporary line process of removing the existing second line in the temporary line section, installing a first temporary line that is a temporary line of the existing first line in the temporary line section on the temporary line site side within the existing site, and switching the existing first line in the temporary line section to the first temporary line; A first line elevating process of constructing a viaduct of the first line on the existing first line of the temporary line section; a first line elevated connection process for connecting the first line viaduct and the first line of the main line in the temporary line unavailable section via a single line elevated first line constructed by the single line direct elevated construction method according to any one of claims 1 to 8; A second line elevating process of constructing a viaduct of the second line on the existing second line of the removed temporary section; and a second line elevated connection process for connecting the viaduct of the second line and the second line of the main line through a single-line elevated second line constructed by the single-line direct elevated construction method according to any one of claims 1 to 8 in the temporary construction unavailable section. Railway section elevation construction method.

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