Rail steel rail replacement system and construction method

Abstract

The invention discloses a rail steel rail replacing system which comprises a power tractor, a rail replacing device and a rail replacing device. The power tractor serves as power walking equipment and is responsible for dragging an operation vehicle to move between a rail welding base and an operation site and between the rail welding base and the operation site. The movable rail welding unit serves as main equipment for steel rail welding and is responsible for completing short rail welding of a rail welding base and steel rail connecting and welding tasks of an operation site; the multifunctional rail conveying trolley serves as a conveying tool of the steel rails and is responsible for transferring, loading and conveying the short rails, the new long steel rails and the old steel rails to designated places; the construction of a rail welding base is simplified and the train investment is reduced by optimizing a front procedure; the steel rails do not need to be temporarily stored on the two sides of the rail, and the safety risk is reduced; in addition, the invention further provides a construction method using the track steel rail replacement system, and the operation difficulty and the maintenance cost of track replacement can be reduced by controlling and operating the track steel rail replacement system.

Description

Technical Field

[0001] The invention belongs to the technical field of rail transit maintenance, and in particular relates to a track rail replacement system and a construction method. Background Art

[0002] The urbanization process has entered a new stage of development. Rail transit is an important facility in the process of urbanization. At present, the operating mileage of urban rail in my country exceeds 10,000 kilometers, and some lines have been in operation for more than 10 years. In addition, due to some special design reasons, there is a great demand for replacing rails with excessive wear.

[0003] At present, the processes of rail replacement construction, rail unloading, rail replacement, and rail recycling in urban rails cannot be completed at one construction site due to factors such as operating time and space limitations, resulting in low construction efficiency. In order to improve construction efficiency, multiple processes and different workstations are operated simultaneously, which makes construction organization difficult. Rail welding bases are generally built, equipped with long-rail trains and L-shaped cranes, and the equipment investment is large. Moreover, when the length of the replaced rail is greater than 100 meters, the rail extension welding must be carried out first. At the same time, the rails need to be temporarily stored on both sides of the track, which poses a risk of rail intrusion and endangering driving safety.

[0004] In response to the above problems, the track rail replacement system provided by the present invention is committed to achieving synchronous and co-located construction of rail replacement. Within one construction site, it can complete tasks such as transportation of new long rails, replacement of rails, and recycling of old rails, thereby realizing the functional content of one vehicle with multiple uses. Summary of the invention

[0005] In order to solve the problem that the urban rail replacement device in the above-mentioned prior art is complicated and difficult to construct, the present invention aims to provide a track rail replacement system with simple structure and diverse functions. The system consists of a power traction vehicle, a mobile rail welding unit, a multifunctional rail transport trolley, etc., and has functions such as rail transportation, rail replacement, and rail welding.

[0006] The present invention provides a rail replacement system, the specific technical scheme of which is as follows, comprising: a power traction vehicle, a mobile rail welding unit, and a multifunctional rail transport trolley connected in sequence; The power tractor: as a power running device, responsible for pulling the working vehicle to move between the rail welding base, the working site and the two; The mobile rail welding unit: as the main equipment for rail welding, is responsible for completing the short rail welding at the rail welding base and the rail connection welding tasks at the work site; The multifunctional rail transport trolley is used as a transport tool for rails and is responsible for transferring and loading short rails, new long rails and old rails and transporting them to designated locations.

[0007] As a preferred embodiment, the multifunctional rail transport trolley comprises: a running gear, a rail gantry crane, and a rail hanger; The running gear serves as a moving and bearing component of the rail transport trolley, and is used to provide a bearing platform that can move on the track. The rail gantry crane and the rail hanger are detachably connected and arranged on the running gear. The rail gantry crane is used to hoist and transport the movable rails; The rail hanger is used for mounting and placing the rails.

[0008] As a preference, the specific structure of the running part includes: running wheels, a rail gantry mounting base, and a rail hanger mounting base; The specific number of the running wheels is two groups, which are symmetrically distributed above the rails on both sides; The running wheels are provided with rail gantry mounting bases on the outer sides away from the rails; The running wheels are provided with rail hanger mounting bases close to the inner sides of the rails.

[0009] As a preferred embodiment, the rail gantry crane specifically comprises: a gantry crane column, a gantry crane beam, a hoisting hoist, and a transverse trolley; The gantry crane upright column is arranged on the running wheel, connected to the rail gantry crane mounting base, and together with the gantry crane crossbeam forms a frame structure of the rail gantry crane; The transverse movement trolley is movably arranged on the rail gantry crane along the gantry crane crossbeam; The lifting hoist is connected to the transverse moving trolley and can be movably arranged in the height direction.

[0010] As a preferred embodiment, the specific structure of the rail hanger includes: a hanger crossbeam, a rail hanger, and a locking device; The hanger crossbeam is perpendicular to the direction of the rails and is connected to the running wheels on both sides; Below the hanger crossbeam, parallel to the direction of the rail, the rail hanger is provided for hanging the rail; The rail hanger is also provided with the locking device for locking and fixing the rail on the rail hanger.

[0011] Preferably, a plurality of rail hangers are provided on the crossbeam and are arranged parallel to the direction of the rails.

[0012] Preferably, the specific number of the rail hangers is 5 groups, which are evenly spaced and distributed on the hanger crossbeam.

[0013] Preferably, the specific number of the multifunctional rail transport trolleys is several groups, and the specific number requirements are flexibly configured and combined to adapt to the rail replacement of rails of different lengths.

[0014] Preferably, both ends of the multifunctional rail transport trolley are sequentially connected to the power traction vehicle and the mobile rail welding unit, and are symmetrically arranged head to tail.

[0015] At the same time, the present invention also provides a construction method of a track rail replacement system using the track rail replacement system, and the specific steps are as follows: (1) Base rail welding: using the railway tracks in open places such as vehicle depots, using the multifunctional rail transport trolley, spread the 25-meter rails along the line on the tracks, and using the mobile rail welding unit, weld the rails to the target replacement length; (2) Transportation of long rails: The rails are lifted, mounted and locked using the multifunctional rail transport trolley; the power traction vehicle drives the train to the rail replacement location, and the two ends of the replaced new rails correspond to the rail replacement starting point and rail replacement end point respectively, thus completing the train alignment; (3) Unloading long rails: Use the multifunctional rail transport trolley to unload the new rails to be replaced; (4) Rail replacement: Use the multifunctional rail transport trolley to lift the old rail to be replaced out of the rail bearing groove and move it to the middle of the track; and lift the new rail to be replaced into the rail bearing groove to complete the rail replacement; (5) Rail welding: using the mobile rail welding unit, perform rail welding operations from the rail replacement starting point and the rail replacement end point to connect the new rails to the existing rails; (6) Recycling of old rails: Use the multifunctional rail transport trolley to lift the old rails to be replaced, hang and lock them, and complete the recycling of the rails; (7) Line restoration: After completing the installation of line fasteners, line inspection, personnel organization, and tool inventory and recovery, and after confirmation that everything is correct, the train returns, personnel leave, and the line is restored.

[0016] Compared with the prior art, the technical solution has the following beneficial effects: it provides a rail replacement system with a simple structure and convenient operation, which is composed of a power tractor, a mobile rail welding unit, and a multifunctional rail transport trolley. It simplifies the construction of the rail welding base and reduces the investment in long rail trains and on-board L-shaped cranes by optimizing the processes of base rail welding and rail transportation. It can realize the transportation of rails of different lengths by increasing or decreasing the number of rail transport trolleys, increase the flexibility of rail transportation, and eliminate the need for gas pressure welding or thermite welding for rail extension welding. It does not require temporary storage of rails on both sides of the track, reducing safety risks. In addition, another object of the present invention is to provide a construction method using a track rail replacement system, which can reduce the operational difficulty and maintenance cost of track replacement by controlling and operating the track rail replacement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic front view of the structure of a track rail replacement system in a specific embodiment; Figure 2 It is a schematic top view of the track rail replacement system structure; Figure 3 This is a schematic diagram of the structure of the multifunctional rail transport trolley; Figure 4 for Figure 3 Schematic diagram of the structure of the multifunctional rail transport trolley from top view; Figure 5 for Figure 3 Schematic diagram of the structure of the medium rail gantry crane.

[0019] The specific figures are: Multifunctional rail transport trolley 1, running part 1-1, running wheel 1-1-1, rail gantry crane mounting base 1-1-2, rail hanger mounting base 1-1-3, rail gantry crane 1-2, gantry crane column 1-2-1, gantry crane crossbeam 1-2-2, lifting hoist 1-2-3, transverse trolley 1-2-4, rail hanger 1-3, hanger crossbeam 1-3-1, rail hanger 1-3-2, rail 2, power traction vehicle 3, mobile rail welding unit 4. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0025] Please refer to Figures 1 to 5 , the track rail replacement system provided by a specific embodiment of the technical solution of the present invention is described, and its structure includes: a power tractor 3, a mobile rail welding unit 4, and a multifunctional rail transport trolley 1 connected in sequence; like Figure 1 and Figure 2 As shown, in this embodiment, the entire track rail replacement system is specifically a special train formation, and the power traction vehicle 3 is arranged at the end thereof; The power tractor 3 is the power running equipment of the entire train formation, and is responsible for providing power to traction operation vehicles for movement and operation at the rail welding base, the operation site, and between the two. In this embodiment, the specific power type of the power tractor 3 is not limited, because under different operation conditions, the traction power can be adaptively selected according to the actual use situation, according to the motor drive or the internal combustion engine drive; like Figure 1 and Figure 2As shown, in this embodiment, the mobile rail welding unit 4 is connected in sequence behind the power tractor 3: as the main equipment for rail welding, it is responsible for completing the short rail welding of the rail welding base and the rail connection welding tasks at the operation site. In the rail welding operation, (flash welding) gas pressure welding or aluminum thermite welding is often used for rail welding. In this embodiment, the specific type of welding is not limited and can be selected and set according to the actual operation conditions as needed; The multifunctional rail transport trolley 1 is used as a rail transport tool to transport short rails, new long rails and old rails to a designated location; Compared with the setting of the track changing device in the prior art, it is necessary to use different machines and tools in the processes of rail unloading, rail replacement, rail recovery, etc., which has low construction efficiency. The track rail replacement system provided by the present invention can realize simultaneous construction of multiple processes and improve construction efficiency. The specific structure of the rail replacement system described in this embodiment is further explained below.

[0026] As a preference, the specific structure of the multifunctional rail transport vehicle 1 described in this embodiment is further limited, such as Figures 3 to 5 As shown, in this embodiment, the multifunctional rail transport trolley 1 specifically comprises: a running part 1-1, a rail gantry 1-2, and a rail hanger 1-3; like Figure 3 As shown, the running part 1-1 is a component for realizing the moving function of the rail transport trolley 1 and providing a bearing platform. By providing a bearing platform that can move on the track, the rail gantry 1-2 and the rail hanger 1-3 can be detachably connected and arranged on the running part, and move along the existing track under the traction of the power traction vehicle 3; The rail gantry crane 1-2 is provided on the running part 1-1 to realize the hoisting and transportation of the rails, facilitate the movement of the rails between the track and the base, complete the rail replacement operation, and avoid the cumbersome construction of a rail gantry crane at the rail replacement operation site and the welding base; The rail hangers 1-3 are provided to meet the requirements for mounting and placing rails, so as to facilitate the transportation of short rails, new long rails, old rails, etc. In this embodiment, the multifunctional rail transport trolley 1 has a quick disassembly and assembly design. By simply disassembling the bolts, the multifunctional rail transport trolley 1 can be disassembled into the running part 1-1, the rail door hanger 1-2, and the rail hanger 1-3. The weight of each piece meets the conditions for manual moving, which is convenient for emergency disposal. The running part 1-1 and the rail hanger 1-3 of the multifunctional rail transport trolley 1 are put off the track in situ, and the rail transport trolley is manually turned over, moved out of the track, and placed upright or against the side walls on both sides of the track, so as to provide working space for other processes and avoid mutual interference between process conversions; The rail gantry crane 1-2 is moved to the track bed, installed across the track, and has a firm support pad, so as to play the role of lifting the rail replacement.

[0027] Furthermore, the specific structure of the running part 1-1 described in this embodiment is further limited, such as Figure 3 As shown, in this embodiment, the specific structure of the running part 1-1 includes: running wheels 1-1-1, rail door crane mounting base 1-1-2, and rail hanger mounting base 1-1-3; like Figure 3 As shown, in this embodiment, the running wheels 1-1-1 adopt a traditional wheel pair split distribution style, with two groups in specific quantity, symmetrically distributed above the rails on both sides, so as to realize forward and backward movement along the rails, and provide installation space for other components; On both sides of the running wheel, a mounting surface away from the outer surface of the rail is provided with a rail gantry mounting base for connecting and installing the rail gantry 1-2; On both sides of the running wheel, a rail hanger mounting base is provided on the mounting surface close to the inner side of the rail, which is used to connect and install the rail hanger 1-3.

[0028] Furthermore, the specific structure of the rail gantry crane 1-2 described in this embodiment is further limited, such as Figure 5 As shown, in this embodiment, the specific structure of the rail gantry crane 1-2 includes: a gantry crane column 1-2-1, a gantry crane beam 1-2-2, a hoisting hoist 1-2-3, and a transverse trolley 1-2-4; The specific number of the portal crane columns 1-2-1 is two groups, which are separately arranged on each of the running wheels 1-1-1 and connected through the rail portal crane mounting base 1-1-2. The columns 1-2-1 and the crossbeams 1-2-2 form the frame structure of the rail portal crane 1-2, forming a frame of the portal structure to provide a loading platform for the hoisting mechanism. The transverse movement trolley 1-2-4 is movably arranged on the rail gantry crane 1-2 along the gantry crane cross beam 1-2-2, realizing flexible movement along the cross beam 1-2-2, facilitating movement between rails and hoisting between free areas and rails; The lifting hoist 1-2-3 is connected to the transverse trolley 1-2-4, and is movable in the height direction through a pulley assembly, so as to facilitate the lifting and lowering of the rails.

[0029] Furthermore, the specific structure of the rail hanger 1-3 described in this embodiment is further limited, such as Figure 3 As shown, the specific structure of the rail hanger 1-3 includes: a hanger crossbeam 1-3-1, a rail hanger 1-3-2, and a locking device; The bracket crossbeam 1-3-1 is perpendicular to the direction of the rails and is connected to the running wheels 1-1-1 on both sides to connect the running wheels 1-1-1 on both sides; Compared with the prior art, in which a load-bearing platform is used to carry and transport the rails, in this embodiment, the rail hanger 1-3-2 is provided below the hanger crossbeam 1-3-1 and parallel to the direction of the rails to hang the rails; In addition, the locking device is also provided on the rail hanger 1-3-2 to lock and fix the rails on the rail hanger to avoid accidents such as the rails moving and falling during transportation, thereby ensuring operation safety.

[0030] Preferably, a plurality of rail hangers 1-3-2 are provided under each of the hanger cross beams 1-3-1 to facilitate simultaneous mounting of a plurality of rails for transportation and improve rail replacement efficiency.

[0031] Further, such as Figure 3 and Figure 4 As shown, in this embodiment, the specific number of the rail hangers 1-3-2 is 5 groups, and they are evenly spaced and arranged on the hanger beam 1-3-1 to ensure that the hanger beam 1-3-1 maintains uniform force when the rails are hung.

[0032] As a preferred method, in order to better adapt to the requirements of rail replacement operations of different lengths, such as Figure 1 and Figure 2 As shown, in the present embodiment, the specific number of the multifunctional rail transport trolleys 1 is several groups, and the specific number can be combined with different numbers of multifunctional rail transport trolleys according to the length requirements of the transported rails to meet the transportation needs of rails of different lengths, and the transportation organization is flexible.

[0033] Furthermore, in order to facilitate the frequent need to move forward and backward during the track change operation, such as Figure 1 and Figure 2 As shown, in this embodiment, both ends of the multifunctional rail transport trolley 1 are sequentially connected to the power traction vehicle 3 and the mobile rail welding unit 4, and the head and tail are symmetrically arranged, so that the rail welding operation can be carried out synchronously and crosswise, and the two rail joints can be welded more quickly, thereby improving the efficiency of rail welding construction.

[0034] At the same time, the present invention also provides a track rail replacement construction method using the track rail replacement system, and the specific steps are as follows: (1) Rail welding at the base: using the railway track in an open place such as a vehicle depot, the 25-meter short rail is hoisted into the track by a gantry crane, and the multifunctional rail transport trolley 1 is used, specifically the rail gantry crane 1-2 is used for hoisting and transportation, and the 25-meter rail is spread out in the middle of the track along the line, and then the mobile rail welding unit 4 is used to weld the rail to the target replacement length, and multiple long rails are welded. Compared with the conventional method, the construction method of the rail replacement system of the present invention reduces the investment in equipment and facilities such as group cranes, roller tracks, and rail storage platforms in the rail welding base; (2) Transportation of long rails: According to the length of the rails, different numbers of the multifunctional rail transport trolleys 1 are combined for marshaling, and the rails are lifted by the rail gantry cranes 1-2 on the multifunctional rail transport trolleys 1, mounted on the rail hangers 1-3 and locked; the power traction vehicle 4 drives the train to the rail replacement location, and the two ends of the replaced new rails 2 correspond to the rail replacement starting point and rail replacement end point respectively, thus completing the train alignment; (3) Unloading long rails: When the train arrives at the rail replacement location, the rail gantry 1-2 on the multifunctional rail transport trolley 1 is used to unload the new rails 2 to be replaced from the rail hanger 1-3 to the designated area; (4) Rail replacement: the multifunctional rail transport trolley 1 is disassembled into the running gear 1-1, the rail gantry 1-2, and the rail hanger 1-3, and the parts are placed sideways to free up space for rail operation. The old rail to be replaced is lifted out of the rail bearing groove using the rail gantry 1-2 and moved to the middle of the track; and the new rail 2 to be replaced is lifted into the rail bearing groove to complete the rail replacement; (5) Rail welding: using the mobile rail welding unit 3, the rail welding operation is performed from the rail replacement starting point and the rail replacement end point, respectively, to connect the replaced new rail 2 with the existing rail; (6) Recycling of old rails: Restore the multifunctional rail transport trolley 1, lift the running gear 1-1 and the rail hanger 1-3 onto the track as a whole, restore and install the rail gantry crane 1-2 in place, connect and fix it to the running gear 1-1, restore and install all the multifunctional rail transport trolleys 1 according to the above steps, and then lift the old rails to be replaced through the rail gantry crane 1-2, hang and lock them, and complete the rail recycling; (7) Line restoration: After completing the installation of line fasteners, line inspection, personnel organization, and tool inventory and recovery, and after confirmation that everything is correct, the train returns, personnel leave, and the line is restored.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A track rail replacement system, characterized in that: It includes the following connected in sequence: power tractor, mobile rail welding unit, multifunctional rail transport trolley; The power tractor: as a power running device, responsible for pulling the working vehicle to move between the rail welding base, the working site and the two; The mobile rail welding unit: as the main equipment for rail welding, is responsible for completing the short rail welding at the rail welding base and the rail connection welding tasks at the work site; The multifunctional rail transport trolley is used as a transport tool for rails and is responsible for transferring and loading short rails, new long rails and old rails and transporting them to designated locations.

2. The track rail replacement system according to claim 1, characterized in that: The specific structure of the multifunctional rail transport trolley includes: a running gear, a rail door crane, and a rail hanger; The running gear serves as a moving and bearing component of the rail transport trolley, and is used to provide a bearing platform that can move on the track. The rail gantry crane and the rail hanger are detachably connected and arranged on the running gear. The rail gantry crane is used to hoist and transport the movable rails; The rail hanger is used for mounting and placing the rails.

3. The track rail replacement system according to claim 2, characterized in that: The specific structure of the running gear includes: running wheels, rail gantry mounting base, and rail hanger mounting base; The specific number of the running wheels is two groups, which are symmetrically distributed above the rails on both sides; The running wheels are provided with rail gantry mounting bases on the outer sides away from the rails; The running wheels are provided with rail hanger mounting bases close to the inner sides of the rails.

4. The track rail replacement system according to claim 3, characterized in that: The rail gantry crane specifically comprises: a gantry crane column, a gantry crane beam, a hoisting hoist, and a transverse trolley; The gantry crane upright column is arranged on the running wheel, connected to the rail gantry crane mounting base, and together with the gantry crane crossbeam forms a frame structure of the rail gantry crane; The transverse movement trolley is movably arranged on the rail gantry crane along the gantry crane crossbeam; The lifting hoist is connected to the transverse moving trolley and can be movably arranged in the height direction.

5. The track rail replacement system according to claim 4, characterized in that: The specific structure of the rail hanger includes: a hanger crossbeam, a rail hanger, and a locking device; The hanger crossbeam is perpendicular to the direction of the rails and is connected to the running wheels on both sides; Below the hanger crossbeam, parallel to the direction of the rail, the rail hanger is provided for hanging the rail; The rail hanger is also provided with the locking device for locking and fixing the rail on the rail hanger.

6. The track rail replacement system according to claim 5, characterized in that: A plurality of rail hangers are arranged on the crossbeam and are arranged parallel to the direction of the rails.

7. The track rail replacement system according to claim 6, characterized in that: The specific number of the rail hangers is 5 groups, which are evenly spaced and distributed on the hanger crossbeam.

8. The track rail replacement system according to any one of claims 1 to 7, characterized in that: The specific number of the multifunctional rail transport trolleys is several groups, and the specific number requirements are flexibly configured and combined to adapt to the rail replacement of rails of different lengths.

9. The track rail replacement system according to claim 8, characterized in that: Both ends of the multifunctional rail transport trolley are sequentially connected with the power traction vehicle and the mobile rail welding unit, and the head and tail are symmetrically arranged.

10. A construction method of a track rail replacement system, for replacing rails using the track rail replacement system according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: (1) Base rail welding: using the railway tracks in open places such as vehicle depots, using the multifunctional rail transport trolley, spread the 25-meter rails along the line on the tracks, and using the mobile rail welding unit, weld the rails to the target replacement length; (2) Transportation of long rails: The rails are lifted, mounted and locked using the multifunctional rail transport trolley; the power traction vehicle drives the train to the rail replacement location, and the two ends of the replaced new rails correspond to the rail replacement starting point and rail replacement end point respectively, thus completing the train alignment; (3) Unloading long rails: Use the multifunctional rail transport trolley to unload the new rails to be replaced; (4) Rail replacement: Use the multifunctional rail transport trolley to lift the old rail to be replaced out of the rail bearing groove and move it to the middle of the track; and lift the new rail to be replaced into the rail bearing groove to complete the rail replacement; (5) Rail welding: using the mobile rail welding unit, perform rail welding operations from the rail replacement starting point and the rail replacement end point to connect the new rails to the existing rails; (6) Recycling of old rails: Use the multifunctional rail transport trolley to lift the old rails to be replaced, hang and lock them, and complete the recycling of the rails; (7) Line restoration: After completing the installation of line fasteners, line inspection, personnel organization, and tool inventory and recovery, and after confirmation that everything is correct, the train returns, personnel leave, and the line is restored.

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