A method for contact network transition in top culvert construction of electrified railway switch area

Abstract

The present invention discloses a transition method of the contact network in the construction of the top culvert in the switch area of ​​an electrified railway. A second transition contact network column foundation is constructed at the roadbed outside the jacking range; a second transition column is installed on the second transition contact network column foundation, and a transition hard span beam is installed on the first transition column and the corresponding second transition column. The transition hard span beam extends along the direction of the railway line, and a transition hanging device located just above the switch is provided on the transition hard span beam; the existing contact network line located just above the switch is hung on the transition hanging device, and then the existing contact network column foundation and the existing contact network cross are removed. The transition method will not affect the jacking construction of the subsequent jacking frame bridge culvert, and at the same time ensures that the existing contact network line is located just above the switch, which can ensure that the electrified train can pass the switch normally. In addition, the length of the hard span beam can be saved.

Description

Technical Field

[0001] The invention relates to a contact network transition method in the construction of top culvert in a switch area of ​​an electrified railway. Background Art

[0002] The overhead line is a special form of transmission line erected above the railway line to supply power to electric locomotives.

[0003] When constructing a culvert with a large span in the turnout area of ​​a railway station, the overhead contact wire columns used for positioning the turnout center will affect the jacking of the frame bridge culvert. That is, within the jacking range of the frame bridge culvert, there are overhead contact wire columns used for positioning the turnout center. If the overhead contact wire columns within the jacking range are not moved or removed, the jacking operation cannot be continued. Therefore, the traditional methods are generally the following treatment methods:

[0004] The first treatment method is to adjust the jacking position and adjust the road alignment. This treatment method may cause the road alignment to be abrupt and uneven, affecting the driver's sight, and easily causing traffic accidents after the road is put into operation; secondly, the adjustment of the road alignment may cause unnecessary expropriation and demolition work, increasing the investment amount.

[0005] The second treatment method is to remove the overhead contact wire columns that affect the jacking of the frame bridge and culvert. If the overhead contact wire columns used for the positioning of the railway turnout that affect the jacking of the frame bridge and culvert are directly removed, it will make it impossible for electric trains to pass on the turnout, seriously interfering with the transportation organization and causing losses to the railway bureau.

[0006] The third solution is to temporarily adjust the position of the contact wire column that affects the jacking of the frame bridge culvert forward or backward, and restore it after the jacking is completed. The temporary forward and backward adjustment cannot meet the requirements of the hanging string to position the contact wire of the turnout, and it is also impossible for the electric train to pass, resulting in the investment of funds without the desired effect, and the relocation work is futile. Summary of the invention

[0007] The present invention provides a method for transition of contact network in the construction of top culvert in the switch area of ​​electrified railway, which overcomes the shortcomings of the background technology. The technical solution adopted by the present invention to solve its technical problem is:

[0008] A method for transitioning a contact network in the construction of a top culvert in a switch area of ​​an electrified railway, which is applicable to a situation where an existing contact network for switch center positioning and crossing a railway line exists within a jacking range of a frame bridge culvert, wherein the existing contact network includes an existing contact network column foundation, an existing contact network span installed on the existing contact network column foundation and extending in a direction perpendicular to the railway line, and an existing contact network line suspended on the existing contact network span, and the frame bridge culvert is divided into a first-jacking frame bridge culvert not corresponding to the existing contact network and a subsequent-jacking frame bridge culvert corresponding to the existing contact network;

[0009] The transition approach includes:

[0010] Step 10, constructing a first transition contact network column foundation at the top of the first jacking frame bridge culvert, and then jacking the first jacking frame bridge culvert to its preset position; then, installing the first transition column on the first transition contact network column foundation;

[0011] Step 20, construct a second transition contact network column foundation corresponding to the first transition contact network column foundation at the roadbed outside the jacking range; then, install the second transition column on the second transition contact network column foundation, and then install a transition hard span beam on the first transition column and the corresponding second transition column, the transition hard span beam extends along the direction of the railway line, and the transition hard span beam is provided with a transition hanging device located just above the switch core, thereby, the first transition contact network column foundation, the second transition contact network column foundation, the first transition column, the second transition column, the transition hard span beam and the transition hanging device form a transition hard span group;

[0012] Step 30, hang the existing contact network line located directly above the switch center on the transition hanging device, and then remove the existing contact network column foundation and the existing contact network crossbar;

[0013] Step 40, performing a jacking operation of the rear jacking frame bridge culvert to move the rear jacking frame bridge culvert to a preset position;

[0014] Step 50, at the top of the rear jacking frame bridge culvert, the existing contact network column foundation and the existing contact network cross span are restored in situ, and then the existing contact network line is re-hung on the existing contact network cross span.

[0015] In a preferred embodiment: in step 20, the first transition contact network column foundation and the corresponding second transition contact network column foundation are located in the same straight track and on the center line of the straight track, so that the transition hard span beam coincides with the center line of the straight track.

[0016] In a preferred embodiment: in step 20, the transition hanging device includes a transition hanging column and a transition arm, the transition hanging column is fixed on the transition cross beam and arranged vertically downward, the transition arm is laterally fixed on the transition hanging column and extends to just above the switch core, and the contact line of the existing contact network is hung on the corresponding transition arm.

[0017] In a preferred embodiment: in step 10, the first transition contact network column foundation and the first jacking frame culvert are integrally cast with reinforced concrete, and anchor bolts are pre-embedded in the first transition contact network column foundation.

[0018] In a preferred embodiment: in step 10, a first connecting flange is provided at the bottom end of the first transition column, and the first connecting flange is screwed to the anchor bolts on the first transition contact network column foundation to fix the first transition column to the first transition contact network column foundation.

[0019] In a preferred embodiment: in step 20, piles are dug at the roadbed outside the jacking range for lowering the steel cage, and then concrete is poured at the steel cage to form the second transition contact network column foundation, and anchor bolts are pre-embedded on the second transition contact network column foundation.

[0020] In a preferred embodiment: in step 20, a second connecting flange is provided at the bottom end of the second transition column, and the second connecting flange is screwed to the anchor bolts on the second transition contact network column foundation to fix the second transition column to the second transition contact network column foundation.

[0021] In a preferred embodiment: in step 20, a third connecting flange is provided at the top of the first transition column, a fourth connecting flange is provided at the top of the second transition column, and fifth connecting flanges are provided at both ends of the rigid span beam, and connecting bolts are provided, and the third connecting flange is locked with one of the fifth connecting flanges, and the fourth connecting flange is locked with another fifth connecting flange through the connecting bolts.

[0022] In a preferred embodiment: in step 20, when there are stray centers on both sides of the straight track, two transition hanging posts can be provided and aligned with the positions of the two stray centers respectively, and two transition arms can be provided and extend to directly above the two stray centers respectively.

[0023] In a preferred embodiment: in step 20, when a switch occurs only on one side of the straight track, one transition sling is provided, and one transition arm is provided and extends to directly above the switch.

[0024] Compared with the background technology, this technical solution has the following advantages:

[0025] 1. This transition method is applicable to the situation where there is an existing contact network for positioning the turnout center in the jacking direction of only part of the frame bridge culvert in the turnout area railway. This transition method can perform jacking operations on the frame bridge culvert in sequence, and install the first transition column on the top of the first jacking frame bridge culvert, and install the second transition column on the roadbed outside the jacking range, so as to install the hard span beam extending along the direction of the railway line. Thus, the hard span beam crosses the range of the subsequent jacking frame bridge culvert along the direction of the railway line, and will not affect the jacking construction of the subsequent jacking frame bridge culvert. At the same time, the hard span beam can be suspended by the transition suspension device located just above the turnout center to ensure that the existing contact network line is located just above the turnout center, so as to ensure that the electric train can pass the turnout normally. Moreover, by taking advantage of the time difference of the staggered jacking of the frame bridge culvert, the first transition contact network column foundation and the first transition column are installed on the top of the first jacking frame bridge culvert, and there is no need to cross the entire frame bridge culvert with the hard span beam, which can save the length of the hard span beam.

[0026] This transition method can minimize the interference with the railway operation order while ensuring the normal construction of the frame top culvert, ensuring that both railway operation and construction production are not affected.

[0027] 2. The transition hard span beam is located on the center line of the straight track. During the construction process, the transition hard span beam can be accurately positioned to ensure the accurate positioning of the switch center by the subsequent transition hanging device, making the construction simpler and more convenient.

[0028] 3. The transition suspension column is arranged vertically downward, and the transition arm is extended horizontally to the top of the switch. The contact line of the existing contact network is hung on the corresponding transition arm. At this time, the contact line of the existing contact network can be accurately positioned just above the switch with high positioning accuracy.

[0029] 4. The first transition contact network column foundation is pre-cast with reinforced concrete between the jacked-in frame bridge culvert, and anchor bolts are pre-embedded on the first transition contact network column foundation, that is, the first transition contact network column foundation is pre-cast as a whole at the top of the jacked-in frame bridge culvert, and then the jacking construction of the jacked-in frame bridge culvert is carried out, which can simplify the construction process and save construction time.

[0030] 5. When there are switchbacks on both sides of the straight track, two transition hangers can be provided and aligned with the positions of the two switchbacks respectively, and two transition arms are provided and extend to the top of the two switchbacks respectively. This can reduce the setting of a hard span beam, reduce the transition cost, and improve space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1The present invention shows a general plan view of a preferred embodiment of a contact network transition method in the construction of a top culvert in a switch area of ​​an electrified railway.

[0033] Figure 2 A schematic diagram showing the positional relationship between a frame culvert, a switch core, and an existing contact network of a preferred embodiment is drawn.

[0034] Figure 3 A schematic longitudinal section diagram of a first transition hard span group of a preferred embodiment is depicted.

[0035] Figure 4 A cross-sectional schematic diagram of a first transition hard span group of a preferred embodiment is depicted.

[0036] Figure 5 A schematic longitudinal section diagram of a second transition hard span group of a preferred embodiment is depicted.

[0037] Figure 6 A cross-sectional schematic diagram of a second transition hard span group of a preferred embodiment is depicted. DETAILED DESCRIPTION

[0038] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0039] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0040] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, the terms "fixed connection" and "fixed connection" should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0041] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0042] A preferred embodiment of a contact network transition method in the construction of a top culvert in a switch area of ​​an electrified railway.

[0043] The existing contact network includes an existing contact network column foundation, an existing contact network crossover installed on the existing contact network column foundation and extending in a direction perpendicular to the railway line, and an existing contact network line suspended on the existing contact network crossover.

[0044] This transition method is applicable to the case where there is an existing overhead wire for switch positioning and across the railway line within the jacking range of the frame bridge culvert. For the convenience of subsequent explanation, the frame bridge culvert is divided into a pre-jacking frame bridge culvert that does not correspond to the existing overhead wire and a post-jacking frame bridge culvert that corresponds to the existing overhead wire. Among them, the jacking direction of the post-jacking frame bridge culvert is the same as the layout direction of the existing overhead wire, both of which are perpendicular to the railway line.

[0045] The transition approach includes:

[0046] Step 10, constructing a first transition contact network column foundation at the top of the first jacking frame bridge culvert, and then jacking the first jacking frame bridge culvert to its preset position; then, installing the first transition column on the first transition contact network column foundation;

[0047] In step 10, the first transition contact network column foundation and the first jacking frame bridge culvert are integrally cast with reinforced concrete, and anchor bolts are pre-embedded in the first transition contact network column foundation.

[0048] In step 10, a first connecting flange is provided at the bottom end of the first transition column, and the first connecting flange is screwed with the anchor bolts on the first transition contact network column foundation to fix the first transition column to the first transition contact network column foundation. Specifically, when the first jacking frame culvert reaches its preset position, the first transition contact network column foundation is located on the center line of the straight track. At this time, the first connecting flange can be screwed with the anchor bolts on the first transition contact network column foundation to fix the first transition column to the first transition contact network column foundation.

[0049] Step 20, construct a second transition contact network column foundation corresponding to the first transition contact network column foundation at the roadbed outside the jacking range; then, install the second transition column on the second transition contact network column foundation, and then install a transition hard span beam on the first transition column and the corresponding second transition column, the transition hard span beam extends along the direction of the railway line, and the transition hard span beam is provided with a transition hanging device located just above the switch center, thereby, the first transition contact network column foundation, the second transition contact network column foundation, the first transition column, the second transition column, the transition hard span beam and the transition hanging device form a transition hard span group.

[0050] In step 20, the first transition contact network column foundation and the corresponding second transition contact network column foundation are located in the same straight track and on the center line of the straight track, so that the transition hard span beam coincides with the center line of the straight track.

[0051] In step 20, the transition hanging device includes a transition hanging column and a transition arm, the transition hanging column is fixed on the transition cross beam and arranged vertically downward, the transition arm is laterally fixed on the transition hanging column and extends to just above the switch core, and the contact line of the existing contact network is hung on the corresponding transition arm.

[0052] In step 20, piles are dug at the roadbed outside the jacking range for lowering the steel cage, and then concrete is poured at the steel cage to form a second transition contact network column foundation, and anchor bolts are pre-embedded on the second transition contact network column foundation.

[0053] In step 20, a second connecting flange is provided at the bottom end of the second transition column, and the second connecting flange is screwed to the anchor bolts on the second transition contact network column foundation to fix the second transition column to the second transition contact network column foundation.

[0054] In step 20, a third connecting flange is provided at the top of the first transition column, a fourth connecting flange is provided at the top of the second transition column, and fifth connecting flanges are provided at both ends of the rigid span beam. Connecting bolts are also provided, and the third connecting flange is locked with one of the fifth connecting flanges, and the fourth connecting flange is locked with another fifth connecting flange through the connecting bolts.

[0055] In step 20, when there are stray centers on both sides of the straight track, two transition hanging posts may be provided and aligned with the positions of the two stray centers respectively, and two transition arms may be provided and extend to directly above the two stray centers respectively.

[0056] In step 20, when a branch occurs only on one side of the straight track, one transition sling is provided, and one transition arm is provided and extends to the top of the branch.

[0057] Step 30, hang the existing contact network line located directly above the switch center on the transition hanging device, and then remove the existing contact network column foundation and the existing contact network crossbar;

[0058] Step 40, performing a jacking operation of the rear jacking frame bridge culvert to move the rear jacking frame bridge culvert to a preset position;

[0059] Step 50, at the top of the rear jacking frame bridge culvert, the existing contact network column foundation and the existing contact network cross span are restored in situ, and then the existing contact network line is re-hung on the existing contact network cross span.

[0060] Please refer to Figures 1 to 6 , which is a specific embodiment of the transition method.

[0061] like Figure 1 As shown, the direction of the railway line in the switch area is left-right, and there are five straight tracks of the railway line in the switch area. The jacking direction of the frame bridge culvert is up and down. There are four frame bridge culverts, namely the first frame bridge culvert 11, the second frame bridge culvert 12, the third frame bridge culvert 13 and the fourth frame bridge culvert 14, wherein the first frame bridge culvert 11 and the second frame bridge culvert 12 do not include a switch core within the jacking range, the third frame bridge culvert 13 includes two switch cores within the jacking range, and the fourth frame bridge culvert 14 includes one switch core within the jacking range. For the convenience of distinction, the two switch cores within the jacking range of the third frame bridge culvert 13 are named as the first switch core 15 and the second switch core 16, and the switch core within the jacking range of the fourth frame bridge culvert 14 is named as the third switch core 17; and the first switch core 15 and the second switch core 16 correspond to the same existing contact network line 7, and the third switch core 17 corresponds to another existing contact network line 8, as shown in FIG. Figure 2 Therefore, the first frame culvert 11 and the second frame culvert 12 are the advanced frame culverts, the third frame culvert 13 and the fourth frame culvert 14 are the backward frame culverts, and the transition method requires the setting of two transition hard span groups. For the convenience of distinction, the two transition hard span groups are named the first transition hard span group 20 and the second transition hard span group 30, wherein the first transition hard span group 20 is located in the first straight track 1 and corresponds to the first switch core 15, and the second transition hard span group 30 is located in the third straight track 3 and corresponds to the second switch core 16 and the third switch core 17.

[0062] First, before the jacking construction of the second frame bridge culvert 12, the two first transition contact network column foundations 21, 31 and the second frame bridge culvert 12 are integrally cast with reinforced concrete, and anchor bolts 22, 32 are pre-embedded on the first transition contact network column foundations 21, 31. Then, the first frame bridge culvert 11 and the second frame bridge culvert 12 are jacked at the same time until they reach the preset position. At this time, the two first transition contact network column foundations 21, 31 are located on the center lines of the first straight track 1 and the third straight track 3, respectively.

[0063] Next, two second transition contact network column foundations 23, 33 are constructed on the roadbed on the right side of the fourth frame bridge culvert 14. The two second transition contact network column foundations 23, 33 are located on the center lines of the first straight track 1 and the third straight track 3 respectively.

[0064] Next, a first transition column 24, 34 is arranged on each of the two first transition contact network column foundations 21, 31, and a second transition column 25, 35 is arranged on each of the two second transition contact network column foundations.

[0065] Then, if Figure 4 As shown, a transition hanging device is installed on the hard span beam 26 of the first transition hard span group 20; Figure 5 As shown, two transition hanging devices staggered along the railway line direction are installed on the hard span beam 36 of the second transition hard span group 30; wherein each transition hanging device includes a transition hanging column 27, 37, 371 and a transition arm 28, 38, 381.

[0066] Next, two rigid span beams 26, 36 are installed, and the two ends of the two rigid span beams 26, 36 are connected to the first transition columns 24, 34 and the second transition columns 34, 35, respectively, so that the two rigid span beams 26, 36 coincide with the center lines of the first straight track 1 and the third straight track 3, respectively. At this time, the hanging places of the three transition arms 28, 38, 381 are respectively located above the first fork 15, the second fork 16 and the third fork 17.

[0067] Next, the existing contact network lines 7 and 8 located directly above the first branch core 15, the second branch core 16 and the third branch core 17 are hung on the corresponding transition hanging devices, and then the existing contact network column foundation and the existing contact network crossover are removed;

[0068] Then, the third frame bridge culvert 13 and the fourth frame bridge culvert 14 are jacked up to move the third frame bridge culvert 13 and the fourth frame bridge culvert 14 to a preset position;

[0069] Finally, the existing contact network column foundation and the existing contact network crossover are restored in situ at the top of the third frame bridge culvert 13 and the fourth frame bridge culvert 14, and then the existing contact network lines 7 and 8 are re-hung on the existing contact network crossover.

[0070] The two hard span beams 26 and 36 cross the range of the third frame bridge culvert 13 and the fourth frame bridge culvert 14 along the direction of the railway line, and will not affect the jacking construction of the third frame bridge culvert 13 and the fourth frame bridge culvert 14. At the same time, the two hard span beams 26 and 36 can hang the existing contact network lines 7 and 8 through three transition hanging devices to ensure that the existing contact network lines 7 and 8 are located directly above the first switch core 15, the second switch core 16 and the third switch core 17, which can ensure that the electric train can pass the switch normally. In addition, by taking advantage of the time difference of the staggered jacking of the frame bridge culvert, the first transition contact network column foundation 22 and 32 and the first transition column 24 and 34 are installed on the top of the second frame bridge culvert 12, and the hard span beams 26 and 36 do not need to cross the entire frame bridge culvert, which can save the length of the hard span beams 26 and 36.

[0071] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A method for transitioning the contact network during the construction of a top culvert in a switch area of ​​an electrified railway, which is applicable to the case where there is an existing contact network used for switch center positioning and crossing the direction of the railway line within the jacking range of a frame bridge culvert, the existing contact network includes an existing contact network column foundation, an existing contact network span installed on the existing contact network column foundation and extending in a direction perpendicular to the railway line, and an existing contact network line suspended on the existing contact network span, and is characterized in that: The frame bridges and culverts are divided into the advanced jacking frame bridges and culverts that are not corresponding to the existing overhead contact network and the subsequent jacking frame bridges and culverts that are corresponding to the existing overhead contact network. The transition approach includes: Step 10, constructing a first transition contact network column foundation at the top of the first jacking frame bridge culvert, and then jacking the first jacking frame bridge culvert to its preset position; then, installing the first transition column on the first transition contact network column foundation; Step 20, construct a second transition contact network column foundation corresponding to the first transition contact network column foundation at the roadbed outside the jacking range; then, install the second transition column on the second transition contact network column foundation, and then install a transition hard span beam on the first transition column and the corresponding second transition column, the transition hard span beam extends along the direction of the railway line, and the transition hard span beam is provided with a transition hanging device located just above the switch core, thereby, the first transition contact network column foundation, the second transition contact network column foundation, the first transition column, the second transition column, the transition hard span beam and the transition hanging device form a transition hard span group; Step 30, hang the existing contact network line located directly above the switch center on the transition hanging device, and then remove the existing contact network column foundation and the existing contact network crossbar; Step 40, performing a jacking operation of the rear jacking frame bridge culvert to move the rear jacking frame bridge culvert to a preset position; Step 50, at the top of the rear jacking frame bridge culvert, the existing contact network column foundation and the existing contact network cross span are restored in situ, and then the existing contact network line is re-hung on the existing contact network cross span.

2. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 1, characterized in that: In step 20, the first transition contact network column foundation and the corresponding second transition contact network column foundation are located in the same straight track and on the center line of the straight track, so that the transition hard span beam coincides with the center line of the straight track.

3. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 2, characterized in that: In step 20, the transition hanging device includes a transition hanging column and a transition arm, the transition hanging column is fixed on the transition cross beam and arranged vertically downward, the transition arm is laterally fixed on the transition hanging column and extends to just above the switch core, and the contact line of the existing contact network is hung on the corresponding transition arm.

4. A method for transitioning contact lines in the construction of top culverts in switch areas of electrified railways according to claim 1, 2 or 3, characterized in that: In step 10, the first transition contact network column foundation and the first jacking frame bridge culvert are integrally cast with reinforced concrete, and anchor bolts are pre-embedded in the first transition contact network column foundation.

5. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 4, characterized in that: In step 10, a first connecting flange is provided at the bottom end of the first transition column, and the first connecting flange is screwed to the anchor bolts on the first transition contact network column foundation to fix the first transition column to the first transition contact network column foundation.

6. A method for transitioning the contact network in the construction of a top culvert in a switch area of ​​an electrified railway according to claim 1, 2 or 3, characterized in that: In step 20, piles are dug at the roadbed outside the jacking range for lowering the steel cage, and then concrete is poured at the steel cage to form a second transition contact network column foundation, and anchor bolts are pre-embedded on the second transition contact network column foundation.

7. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 6, characterized in that: In step 20, a second connecting flange is provided at the bottom end of the second transition column, and the second connecting flange is screwed to the anchor bolts on the second transition contact network column foundation to fix the second transition column to the second transition contact network column foundation.

8. A method for transitioning contact lines in the construction of top culverts in switch areas of electrified railways according to claim 1, 2 or 3, characterized in that: In step 20, a third connecting flange is provided at the top of the first transition column, a fourth connecting flange is provided at the top of the second transition column, and fifth connecting flanges are provided at both ends of the rigid span beam. Connecting bolts are also provided, and the third connecting flange is locked with one of the fifth connecting flanges, and the fourth connecting flange is locked with another fifth connecting flange through the connecting bolts.

9. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 3, characterized in that: In step 20, when there are stray centers on both sides of the straight track, two transition hanging posts may be provided and aligned with the positions of the two stray centers respectively, and two transition arms may be provided and extend to directly above the two stray centers respectively.

10. The method for transition of contact network in the construction of top culvert in switch area of ​​electrified railway according to claim 3, characterized in that: In step 20, when a branch occurs only on one side of the straight track, one transition sling is provided, and one transition arm is provided and extends to the top of the branch.

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