Construction method for section replacement of combined turnouts in large marshalling yards of operating lines

Abstract

This invention discloses a method for segmented replacement of combined turnouts in large marshalling yards on operating lines. The method involves breaking down the combined turnouts into multiple new turnouts and constructing them segment by segment, specifically including the following steps: 1) Surveying and setting out the area to be replaced; 2) Pre-laying the turnouts: Laying multiple new turnouts on the outer side of the existing line; 3) Removing the existing line or existing turnouts: Removing the existing line or existing turnouts within the area to be replaced; 4) Installing the new turnout components: Moving the new turnouts corresponding to the area to be replaced to the designed position, and laying transition rails to connect the existing lines before and after the new turnouts according to the removal area; 5) Connecting the turnouts: After the new turnouts are in place, fine-tuning the new turnouts and the existing lines before and after them to meet the requirements for line operation, and then opening the new turnout section; 6) Repeating steps 3) to 5) above to lay and open other new turnouts. This invention adopts a segmented replacement scheme, reducing the impact of turnout replacement construction on existing line transportation.

Description

Technical Field

[0001] This invention relates to the field of railway engineering. More specifically, this invention relates to a method for the segmented replacement of combined turnouts in large marshalling yards on operating lines. Background Technology

[0002] In recent years, my country's economy has grown rapidly, the freight industry has flourished, and people's demand for freight has continued to increase, with higher and higher requirements for freight efficiency. Railway freight has the advantages of large capacity and low freight rates, making it more competitive in the industry.

[0003] To improve railway freight efficiency and adapt to the ever-increasing freight demand, the capacity expansion and renovation of marshalling yards are becoming increasingly common. These renovations require the modification of turnouts in the throat area, replacing existing turnouts with new ones to increase parallel train routes and improve transport efficiency. However, the space for replacing these turnouts is limited, the workload is large, and the entire replacement process involves long track closures, significantly impacting existing line transport. Therefore, minimizing the impact of turnout replacement work on existing line transport has become an urgent problem for railway freight transport. Summary of the Invention

[0004] Another objective of this invention is to provide a method for the segmented replacement of combined turnouts in large marshalling yards of operating lines. By adopting a segmented replacement scheme, the impact of turnout replacement construction on existing line transportation is reduced.

[0005] To achieve these objectives and other advantages of the present invention, a method for segmented replacement of combined turnouts in large marshalling yards of operating lines is provided, which decomposes the combined turnouts into multiple new turnouts and constructs them segment by segment, specifically including the following steps:

[0006] 1) Surveying and setting out the area to be replaced;

[0007] 2) Pre-laying of turnouts: Laying multiple new turnouts on the outside of the existing line;

[0008] 3) Removal of existing lines or existing turnouts: After the key line is blocked, the existing lines or existing turnouts within the range of the turnouts that need to be replaced are removed.

[0009] 4) Install new turnout components: Move the new turnouts corresponding to the turnout replacement range in step 2) to the designed position, and lay transition rails to connect the existing lines before and after the new turnouts according to the removal range.

[0010] 5) Smooth connection of turnouts: After the new turnout is in place, the new turnout and the existing lines before and after it are finely adjusted to meet the requirements for opening the line, and then the new turnout section is opened.

[0011] 6) Repeat steps 3) to 5) above to lay and open other new turnouts until the replacement construction of the combined turnouts is completed.

[0012] Preferably, the combined turnout is decomposed into a double-crossing turnout, a single turnout, and a crossover based on the turnout rail gap.

[0013] Preferably, in step 3):

[0014] The proposed replacement area has an existing single crossover that connects smoothly with the existing crossover. The first replacement will be a combined turnout that connects smoothly with the existing crossover. The crossover to be replaced will be located through the combined turnout.

[0015] Preferably, in step 3):

[0016] The proposed replacement area has an existing single crossover that runs in the opposite direction to the existing crossover. First, replace the single turnout on the opposite side of the double-crossing connection turnout, and then replace the double-crossing connection turnout.

[0017] Preferably, the half-length of the double-ended turnout is equal to the rear length of the existing single turnout.

[0018] Preferably, in step 1), the measurement and setting out specifically involves:

[0019] The layout of the combined turnout uses the center of the double-crossing turnout as the control point. The remaining new turnouts are laid out according to their relative distance from the control point. The front, center, tail, and crossover center of each new turnout are laid out respectively, and the spacing between adjacent lines is measured as the control stakes when the new turnouts are pre-laid.

[0020] Preferably, in step 3), when the existing turnout is removed, the existing track bed is excavated to a depth 10cm lower than the bottom surface of the new turnout sleeper, so as to reduce the disturbance to the existing track bed.

[0021] Preferably, in step 4), moving the new turnout to the designed position specifically involves:

[0022] Six to eight transverse running rails are laid under the new turnout. The new turnout is moved laterally to the existing line where the turnout is to be installed using the transverse running rails. A longitudinal running rail is temporarily laid at the removed turnout location to temporarily connect the removed existing line. The new turnout is moved to the design position above the existing line and the longitudinal running rails. A gantry crane is used to lift the new turnout as a whole, the longitudinal running rails are removed, and the new turnout is lowered to the design position.

[0023] The present invention has at least the following beneficial effects: Engineering practice has verified that the solution can effectively solve the problem of replacing large combined turnouts, and is efficient, practical, safe and reliable with minimal impact on existing railway transportation; This construction method rationally decomposes the combined turnouts and implements them in sections and key points, which reduces the workload of each key point construction, shortens the operation time of each key point, and reduces the impact of construction on existing railway transportation.

[0024] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0025] Figure 1 This is a flowchart of the construction process of the present invention;

[0026] Figure 2 This is a schematic diagram of the combined turnout segmentation of the present invention;

[0027] Figure 3 This is a schematic diagram showing an existing single crossover that connects to an existing crossover in the area where the proposed replacement paving is to be completed.

[0028] Figure 4 This is a schematic diagram showing an existing single crossover in the area where the proposed replacement paving is to take place, which runs in the opposite direction to the existing crossover.

[0029] Figure 5 This is a schematic diagram of the structure of the compound crossover connection turnout of the present invention.

[0030] 1. The proposed replacement area; 2. Existing crossover track; 3. Existing single crossover track; 4. Existing single turnout; 5. Double-junction crossover turnout; 6. Single turnout; 7. Crossover track. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0032] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] like Figure 1-5As shown, prior to construction, a site survey was conducted on the existing turnouts in the proposed replacement area 1. The survey primarily investigated the feasibility of the turnout replacement, including the existing line's transportation conditions, surrounding environment, and existing line status. Key aspects included the existing turnout drawing number, rail specifications and dimensions, rail joint configuration, sleeper and fastener models, track gradient, and track spacing. Based on the survey results, the detailed parameters of the combined turnout were verified to ensure compatibility between the rails, sleepers, pads, and bolts at the junction of the combined turnout and the existing turnout. A construction plan was developed based on the survey results, and a key plan was submitted, specifying the closure scope, closure time, construction content, impact area, reopening conditions, and necessary coordination. The submission of the key plan was carried out in accordance with the requirements of the Railway Bureau's "Detailed Rules for the Implementation of Construction Management on Operating Lines."

[0034] To minimize the impact of track replacement construction on existing railway line transportation, this invention provides a method for segmented track replacement construction of combined turnouts in large marshalling yards of operating lines. This method breaks down the combined turnouts into multiple new turnouts, constructing them in sections, making full use of station maintenance windows, and opening each section as it is replaced. This shortens the time of each closure and reduces the impact of turnout replacement construction on existing railway line transportation. The specific steps include:

[0035] 1) Surveying and setting out the proposed replacement area 1;

[0036] After receiving the turnout design drawings, the construction unit reviews them, focusing on verifying the consistency between the combined turnout and the existing turnout, as well as the compatibility of the components. Once the review is successful, the unit measures and lays out the turnout according to the drawings. After laying out, the locations are verified to ensure they are on the centerline of the existing line. If the new turnout axis does not coincide with the existing line, the existing line should be reconnected to ensure the relative dimensions of the combined turnout are consistent with the design drawings.

[0037] 2) Pre-laying of turnouts: Laying multiple new turnouts on the outside of the existing line;

[0038] To minimize the impact of turnout installation on existing line operations, the installation of new turnouts on existing lines should primarily be carried out at key points. Turnouts should first be pre-laid on the outer side of the existing line at locations that do not affect traffic safety. During pre-laying, the turnouts should be assembled according to the planned replacement sequence. Especially when pre-laying in layers, the principle of "replace first, then lay" should be followed, meaning the first part to be replaced should be pre-laid on the top layer to avoid secondary longitudinal and lateral shifts. After pre-laying is completed, the new turnout pre-laying should be inspected promptly. Only after passing the inspection can the key points be installed.

[0039] 3) Removal of existing lines or existing turnouts: After the key line is blocked, the existing lines or existing turnouts within the range of the turnouts that need to be replaced are removed.

[0040] According to the approved daily schedule, the station will organize a pre-construction meeting with the construction unit and relevant equipment management units to clarify the construction tasks and workload of each unit, the preparation work for construction personnel, machinery, materials, etc., the coordination of construction vehicles, entry and exit methods and permits, the main construction unit, cooperating units and safety supervisors, safety control measures at the junction, transportation and train operation organization plans, registration and cancellation precautions, and coordinate any issues that need to be resolved. After the construction order is issued, the construction unit will close the line according to the dispatch order and set up protection according to the regulations for construction management of operating lines. Construction at key points must be carried out strictly in accordance with the time, mileage, construction content and scope of impact specified in the dispatch order, and construction beyond the scope is strictly prohibited.

[0041] After ensuring proper construction protection, existing lines or existing turnouts within the area requiring replacement should be dismantled manually and with the aid of machinery. The joints between combined turnouts and existing turnouts require close monitoring to prevent over- or under-dismantling. Dismantled fasteners should be collected by designated personnel, and old materials should be promptly moved outside the existing line area, ensuring they do not encroach on the track width.

[0042] 4) Install new turnout components: Move the new turnouts corresponding to the turnout replacement range in step 2) to the designed position, and match the rails according to the dismantling range, and lay transition rails to connect the existing lines before and after the new turnouts.

[0043] 5) Smooth connection of turnouts: After the new turnout is in place, the new turnout and the existing track before and after it are finely adjusted according to the design centerline and elevation. The geometric dimensions of the new turnout are adjusted, including track gauge, height, and level. Then the track bed of the new turnout is tamped and compacted. The equipment management unit conducts joint acceptance of the track section and the new turnout. After confirming that the conditions for train release are met, the pin is opened. The new turnout opened in sections needs to be nailed and locked, and only the direction of the existing track is opened.

[0044] 6) Repeat steps 3) to 5) above to lay and open other new turnouts until the replacement construction of the combined turnouts is completed.

[0045] After all sections of the combined turnout have been replaced, the transition rails should be removed, and the rails should be officially installed and replaced according to the turnout drawings. Alternatively, the transition rails can be replaced section by section before the section is opened, depending on the completion status. After construction is completed according to design requirements, the combined turnout should be inspected and accepted as a whole, mainly checking the geometric dimensions of the crossover direction and the electrical interlocking conditions. After acceptance, the original fasteners and locking mechanisms should be removed, and the entire unit should be opened to traffic.

[0046] This invention rationally decomposes combined turnouts and implements the work in sections, reducing the workload and time required for each section's construction, thus ensuring the smooth implementation of key construction tasks. Simultaneously, transitional measures are implemented after section replacement to meet the needs of section opening, minimizing the impact of construction on existing railway lines. Engineering practice has verified that this solution effectively addresses the challenges of replacing large combined turnouts, demonstrating high efficiency, practicality, safety, and reliability with minimal impact on existing railway lines. This method is applicable to the section-by-section replacement of large combined turnouts, and is particularly suitable for replacing large combined turnouts in operating marshalling yards.

[0047] In another technical solution, the combined turnout is decomposed into a double-crossing turnout 5, a single turnout 6, and a crossover 7 based on the turnout rail gap.

[0048] In this technical solution, such as Figure 2 As shown, by utilizing the turnout rail gaps, the combined turnout can be reasonably decomposed, which can avoid affecting the opening of the segmented components after the new turnout components are installed.

[0049] In another technical solution, in step 3):

[0050] In the proposed replacement area 1, there is an existing single crossover 3 that is connected to the existing crossover 2. First, replace the combined turnout with the double crossover 5 that is connected to the existing crossover 2. Locate the crossover to be replaced through the double crossover 5.

[0051] The proposed replacement area 1 has an existing single crossover 3 that is opposite to the existing crossover 2. First, replace the single turnout on the opposite side of the double crossover connection turnout 5, and then replace the double crossover connection turnout 5.

[0052] In this technical solution, because the combined turnout is replaced in sections, the construction plan needs to be formulated based on the site survey results to determine the construction sequence, which mainly falls into the following two categories:

[0053] First, when there is an existing single crossover 3 in the proposed replacement area 1 that connects to the existing crossover 2, in order to ensure the smoothness of the track after replacement, the replacement of the double-crossover connection turnout 5 in the combined turnout must be completed first. The double-crossover connection turnout 5 is used to locate the crossover to be replaced. The first double-crossover connection turnout 5 to be implemented is as follows: Figure 3 As shown in the central area ①; Area 1, where the proposed replacement track is located, does not have an existing single crossover 3 or an existing crossover 2, and can be implemented accordingly; there is no specific order for the replacement of the other new turnouts.

[0054] Secondly, because the long sleepers behind the single turnouts on the opposite side of the double-crossing turnout 5 affect the placement of the sleepers for the double-crossing turnout 5, in order to ensure smooth construction, the replacement of the single turnouts must be completed first, and then the replacement of the double-crossing turnout 5 can be carried out. Figure 4As shown, the replacement of single turnouts in area ① is carried out first, followed by the replacement of turnout 5 in area ②, and the replacement of other new turnouts has no specific order.

[0055] In another technical solution, such as Figure 5 As shown, since the existing crossover 2 and the combined turnout are connected by the double crossover 5, in order to make the double crossover 5 meet the detailed dimensions of the connection parts with the existing crossover 2, that is, the center of the double crossover 5 is consistent with the center of the existing single turnout 4 at the replacement site, it is necessary to make reasonable improvements to the double crossover 5 so that the half length of the double crossover 5 is the same as the rear length of the existing single turnout 4.

[0056] The design of the double-junction turnout 5 should be completed by a unit with turnout design qualifications and a valid turnout design drawing should be issued. When designing the turnout drawing, attention should also be paid to verifying whether the newly designed turnout components (pad plate, turnout sleeper bolt, clamp plate, connecting plate, etc.) are compatible with the existing reused parts to ensure the integrity of the combined turnout. The design of the double-junction turnout 5 should be completed before construction.

[0057] In another technical solution, step 1), the measurement and setting out specifically involves:

[0058] The layout of the combined turnout uses the center of the 5th turnout of the double-crossing turnout as the control point. The remaining new turnouts are laid out according to their relative distance from the control point. The front, center, tail and crossover center of each new turnout are laid out respectively, and the spacing between adjacent lines is measured as the control stakes when the new turnouts are pre-laid.

[0059] In another technical solution, in step 3), when the existing turnout is removed, the existing track bed is excavated to a depth 10cm lower than the bottom surface of the new turnout sleeper, so as to reduce the disturbance to the existing track bed.

[0060] In another technical solution, step 4), moving the new turnout to the designed position, specifically involves:

[0061] Six to eight transverse running rails are laid under the new turnout. The new turnout is moved laterally to the existing line where the turnout is to be installed using the transverse running rails. A longitudinal running rail is temporarily laid at the removed turnout location to temporarily connect the removed existing line. The new turnout is moved to the design position above the existing line and the longitudinal running rails. A gantry crane is used to lift the new turnout as a whole, the longitudinal running rails are removed, and the new turnout is lowered to the design position.

[0062] This construction method was applied during the capacity expansion and renovation project of Wuhan North Marshalling Yard, located in Huangpi District, Wuhan City. The method successfully addressed the installation of the two-way, four-way combined turnout in Yard VI, ensuring the smooth progress of the Wuhan North Marshalling Yard renovation.

[0063] 1. By using this construction method, the impact on existing railway transportation can be reduced by 54 hours, the impact on freight trains can be reduced by 90 trains, and the cost loss can be reduced by 777,600 yuan compared with the conventional whole-set replacement construction.

[0064] 2. Due to the need for multiple key points for the phased relocation, the number of key points will be increased by 4. The construction key points on the operating line involve the cooperation of the equipment management unit, etc. Each key point will increase the cost by 20,000 yuan, for a total increase of 2 × 4 = 80,000 yuan.

[0065] 3. Due to the need for transitional opening of the road in sections, five additional transitional measures were implemented, with a cost of 15,000 yuan per measure, for a total increase in cost of 15,000 × 4 = 60,000 yuan.

[0066] In summary, using this construction method, the single set of combined turnouts generated a benefit of 777,600 - 80,000 - 60,000 = 637,600 yuan during the capacity expansion and renovation of Wuhan North Marshalling Yard, demonstrating good economic benefits.

[0067] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for sectional replacement construction of a combined turnout section of a large marshalling yard of a main line, characterized in that, The combined turnout is decomposed into multiple new turnouts, the combined turnout is decomposed into the compound junction connecting turnout, the single opening turnout and the cross-over according to the turnout rail joint, the segmented key construction points are constructed, and the specific steps include the following steps. 1) The measurement and lofting of the proposed replacement area is performed; 2) The turnout pre-paving is performed; a plurality of new turnouts are paved on the outer side of the existing line; 3) The existing line or the existing turnout is removed; after the key line is blocked, the existing line or the existing turnout in the range of the turnout to be replaced is removed; when the proposed replacement area exists the existing single crossover connected with the existing cross-over in sequence, the compound junction connecting turnout connected with the combined turnout and the existing cross-over in sequence is replaced first, and the cross-over to be replaced is positioned through the compound junction connecting turnout; when the proposed replacement area exists the existing single crossover reverse to the existing cross-over, the single opening turnout opposite to the compound junction connecting turnout is replaced first, and then the compound junction connecting turnout is replaced; 4) The new turnout part is inserted and paved; the new turnout corresponding to the range of the turnout to be replaced in the step 2) is moved to the design position, and the transition rail is paved according to the removal range to connect the existing lines before and after the new turnout; 5) The sequence connection before and after the turnout is performed; after the new turnout is positioned, the new turnout and the existing lines before and after the new turnout are finely adjusted to meet the line opening requirements, and then the new turnout is opened; 6) The steps 3) to 5) are repeated, the other new turnouts are paved and opened, and the replacement construction of the combined turnout is completed.

2. The method of claim 1, wherein the method is characterized by, The half length of the compound junction connecting turnout is equal to the rear length of the existing single opening turnout.

3. The method of claim 1, wherein the method is characterized by, In the step 1), the measurement and lofting is specifically as follows: The combined turnout lofting takes the compound junction connecting turnout heart as the control point, the relative distance of the control point is used for the point spreading of the rest of the new turnouts, the turnout front, the turnout heart, the turnout tail and the cross-over diamond heart of each new turnout are respectively laid out, and the adjacent line spacing is measured and drawn as the control pile in the new turnout pre-paving.

4. The method of claim 1, wherein the method is a method of sectionalized replacement construction of a combined turnout of a large classification yard of a main line, characterized by, In the step 3), when the existing turnout is removed, the existing turnout bed is excavated to be 10 cm lower than the new turnout pillow bottom surface, so as to reduce the disturbance to the existing line bed.

5. The method for segmented replacement of combined turnouts in large marshalling yards of operating lines as described in claim 1, characterized in that, In the step 4), the new turnout is moved to the design position, and the specific steps are as follows: 6-8 transverse running rails are arranged under the new turnout, the new turnout is transversely moved to the existing line where the turnout is to be inserted and paved through the transverse running rails; the existing line is temporarily connected through the temporary paving of the longitudinal running rail at the removed turnout position, the new turnout is moved to the upper side of the design position through the existing line and the longitudinal running rail, the new turnout is integrally lifted by the portal jacking machine, the longitudinal running rail is removed, and then the new turnout is dropped to the design position.

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