Construction method based on partition assembly and accumulated traction slippage

Abstract

The invention discloses a construction method based on partition assembly and accumulative traction slippage, which comprises the following steps: arranging permanent piers and temporary brackets along the design position of a to-be-erected steel box girder to form a multi-stage support system; erecting a total assembly bracket in the starting area, arranging a traction platform at the top of the permanent pier, and installing traction equipment; steel box girder sections are sequentially assembled on the general assembly support, steel guide beams are installed at the front ends of the sections which are firstly assembled, and traction equipment is connected with a traction base through a traction cable; a steel box girder is divided into a plurality of assembly units, and forward traction is gradually conducted in an accumulated slippage mode of one-section assembly and one-section slippage; in the sliding process, a steel guide beam is used for transition supporting, a rear temporary support is removed, the splicing space is released, and a traction connecting point is transferred to the tail end of the current splicing unit; the steps are repeated until all the sections are assembled and integrally slide to the position above the design position; and the beam is dropped in place. The overall traction of the large-tonnage steel box girder is decomposed into multiple times of small-tonnage slippage, the equipment requirement and the construction risk are reduced, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of bridge engineering construction technology, and in particular to a construction method based on partitioned assembly and cumulative traction sliding. Background Technology

[0002] Steel box girders are widely used in bridge projects crossing existing railway and highway lines due to their advantages such as high structural strength, large span capacity, and short construction period. For large-span, heavy-tonnage steel box girder structures, common construction methods include hydraulic traction sliding and jacking construction. Among these, hydraulic traction sliding construction has become an important technical means for the installation of cross-line steel box girders due to its mature equipment, high control precision, and minimal impact on existing lines.

[0003] In actual engineering projects, the overall weight of large-tonnage steel box girders often reaches several thousand tons. If the method of integral assembly followed by single-stage traction and sliding is adopted, not only are the performance requirements of the traction equipment extremely high, but the load-bearing capacity of the traction platform and temporary supports also faces enormous challenges, and there are significant safety risks during construction. At the same time, due to the limited working space at the construction site and the operational safety requirements of existing lines, the traditional one-stage sliding method is difficult to meet the actual needs of the project. Summary of the Invention

[0004] This application provides a construction method based on partitioned assembly and cumulative traction sliding, which solves the problems mentioned in the background art.

[0005] This application provides a construction method based on partitioned assembly and cumulative traction sliding, including: S1: Several sets of permanent piers are set along the design position of the steel box girder to be erected, and several sets of temporary supports are arranged between adjacent permanent piers and in the extension direction of the permanent piers to form a multi-level support system distributed along the sliding direction. S2: Erect the main assembly support in the preset starting area, and set up a traction platform on the top of the permanent pier near the traction side, and install the traction equipment on the traction platform; S3: The steel box girder segments are assembled sequentially on the main assembly support, and a steel guide beam is installed at the front end of the first assembled segment. A traction base is set at the bottom of the steel box girder segments and the steel guide beam. The traction equipment is connected to the traction base through a traction cable. S4: According to the design sequence, the steel box girder is divided into multiple assembly units, each of which consists of at least one segment; each assembly unit is assembled in sequence, and a cumulative sliding method of "assembling one unit and sliding one unit" is adopted, so that the assembled and slid steel box girder segments serve as the bearing platform for the assembly of subsequent segments, and the steel box girder as a whole is gradually pulled forward and slid. S5: During each sliding process, the steel guide beam is used to provide transition support between the temporary support and the permanent pier. After the front end of the steel guide beam is connected to the temporary support or permanent pier in front, it continues to be pulled and slid to the preset position. S6: During the sliding process, depending on the position of the current assembly unit, the temporary support behind is removed or partially removed to release the assembly space, and the traction connection point of the traction equipment is transferred from the end of the segment that has completed the sliding to the end of the current assembly unit to realize the segmented transmission of traction force. S7: Repeat the above operations of assembling the assembly unit, sliding the unit, changing the traction point and removing the temporary support until all steel box girder segments are assembled and tractioned and slid as a whole to the design position directly above it. S8: Remove the temporary supports and steel guide beams, and lower the steel box girder onto the permanent piers to complete the construction.

[0006] In one possible implementation, during the sliding process, based on the operational requirements of the existing line within the construction section, the traction sliding operation of the steel box girder or steel guide beam crossing the existing line is carried out during the railway maintenance window.

[0007] In one possible implementation, the traction device is a hydraulic traction device, and the traction cable is a steel strand.

[0008] In one possible implementation, before the steel box girder is slid into place as a whole, a portion of the steel guide beam is removed to reduce the traction load, depending on the sliding distance and the arrangement of temporary supports.

[0009] In one possible implementation, the steel box girder is assembled segment by segment from the far end to the near end, and the traction sliding direction is a unidirectional cumulative advancement from the assembly area to the design position.

[0010] In one possible implementation, in step S3, after the traction device is connected to the traction base, the traction cable is pre-tensioned.

[0011] In one possible implementation, in step S3, the steel guide beam is installed at the front end of the steel box girder segment to cross the gap between the temporary support and the permanent pier during the sliding process.

[0012] In one possible implementation, the removal or partial removal of the rear temporary support in step S6 includes: Remove the temporary supports located within the current assembly area of ​​the assembly unit to provide working space for the assembly of subsequent segments.

[0013] In one possible implementation, step S8, which involves lowering the steel box girder onto the permanent pier, specifically includes: using vertical jacks or a lowering device to transfer the steel box girder from the temporary support system to the support of the permanent pier for permanent placement.

[0014] In one possible implementation, the total weight of the steel box girder is not less than 3,000 tons, and the total distance of the traction sliding is not less than 100 meters.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects: This application decomposes the overall traction of a large-tonnage steel box girder into multiple small-tonnage, short-distance sliding movements by using a partitioned assembly and cumulative sliding method. This significantly reduces the requirements for the capacity of the traction equipment and the strength of the temporary supports, and improves construction safety.

[0016] By segmenting the connection points and dismantling the temporary supports in stages, the traction force was rationally transferred during the sliding process, avoiding the problem of traction force concentration caused by the increase of segments. By combining the track maintenance window with the sliding section of the steel box girder or steel guide beam that crosses the existing line, the impact on the existing railway operation is reduced and the flexibility of construction organization is improved. The steel guide beam acts as a transitional support during the sliding process, effectively solving the cantilever stress problem of large-span steel box girders when crossing temporary supports and piers, and ensuring the stability of the sliding process. This method is applicable to the construction of steel box girders with large tonnage, long distance, and multiple crossings of existing lines, and has good potential for widespread application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is the elevation layout diagram of segment F in the embodiments of this application; Figure 2 This is the elevation view of the steel beam during its first sliding motion in the embodiments of this application; Figure 3 This is an elevation view of the secondary sliding of the steel beam in an embodiment of this application; Figure 4 This is an elevation layout diagram of segment E in the embodiments of this application; Figure 5 This is an elevation view of the steel beam undergoing three-stage sliding in an embodiment of this application; Figure 6 This is an elevation layout diagram of segments D-1 and D-2 assembled in the embodiments of this application; Figure 7 This is an elevation view of the steel beam sliding four times in the embodiments of this application; Figure 8 This is the elevation layout diagram of segment C in the embodiments of this application; Figure 9 This is an elevation view of the steel beam undergoing five sliding operations in an embodiment of this application; Figure 10 This is the elevation layout diagram of segment B in the embodiment of this application; Figure 11 This is an elevation view of the steel beam undergoing six sliding actions in an embodiment of this application; Figure 12 This is an elevation layout diagram of the assembly of segment A and its extension in an embodiment of this application; Figure 13 This is an elevation view of the steel beam sliding to the designed position in an embodiment of this application; Figure 14 This is a diagram showing the beam placement layout in an embodiment of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for 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 application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0021] This application provides a construction method based on partitioned assembly and cumulative traction sliding, including the following steps S1-S8: S1: Several sets of permanent piers are set along the design position of the steel box girder to be erected, and several sets of temporary supports are arranged between adjacent permanent piers and in the extension direction of the permanent piers to form a multi-level support system distributed along the sliding direction. S2: Erect the main assembly support in the preset starting area, and set up a traction platform on the top of the permanent pier near the traction side, and install the traction equipment on the traction platform; S3: Assemble the various segments of the steel box girder sequentially on the main assembly support, install the steel guide beam at the front end of the first assembled segment, and set the traction base at the bottom of the steel box girder segments and the steel guide beam. The traction equipment is connected to the traction base through the traction cable. S4: According to the design sequence, the steel box girder is divided into multiple assembly units, each of which consists of at least one segment; each assembly unit is assembled in sequence, and the cumulative sliding method of "assembling one unit and sliding one unit" is adopted, so that the assembled and slid steel box girder segments serve as the bearing platform for the assembly of subsequent segments, and the steel box girder as a whole is gradually pulled forward and slid. S5: During each sliding process, the steel guide beam is used to provide transition support between the temporary support and the permanent pier. After the front end of the steel guide beam is connected to the temporary support or permanent pier in front, it continues to be pulled and slid to the preset position. S6: During the sliding process, depending on the position of the current assembly unit, the temporary support behind is removed or partially removed to release the assembly space, and the traction connection point of the traction equipment is transferred from the end of the segment that has completed the sliding to the end of the current assembly unit to realize the segmented transmission of traction force. S7: Repeat the above operations of assembling the assembly unit, sliding the unit, changing the traction point and removing the temporary support until all steel box girder segments are assembled and tractioned and slid as a whole to the design position directly above it. S8: Remove the temporary supports and steel guide beams, and lower the steel box girder onto the permanent piers to complete the construction.

[0022] It should be noted that the construction method based on partitioned assembly and cumulative traction sliding provided in this application, by adopting the core concept of "partitioned assembly and cumulative sliding," decomposes the overall traction of a large-tonnage steel box girder into multiple small-tonnage, short-distance sliding operations. Combined with the segmented conversion of traction connection points and the phased dismantling of temporary supports, this achieves reasonable transmission of traction force and avoids the problem of traction force concentration caused by the increase in segments. Simultaneously, the use of steel guide beams for transitional support during the sliding process effectively solves the cantilever stress problem of large-span steel box girders when crossing temporary supports and piers, ensuring the stability of the sliding process. Compared with the prior art, this application effectively overcomes the technical problems of "high difficulty in overall traction sliding, high equipment requirements, high safety risks, and complex traction system conversion and low construction efficiency during segmented sliding," and has the outstanding advantages of reasonable structure, simple operation, safety and reliability, and high construction efficiency.

[0023] In this embodiment, by selecting the traction and sliding operation of the steel box girder or steel guide beam crossing the existing line during the railway maintenance window based on the operational requirements of the existing line within the construction section, the core risk period of the cross-line construction is strictly limited to a safe window without train traffic. This effectively avoids mutual interference between the sliding operation and railway operation, eliminating potential safety hazards to the existing line during construction. Simultaneously, by concentrating the critical crossing and sliding operations within the railway maintenance window, non-critical operations (such as assembly, traction point conversion, and temporary support dismantling) can be carried out normally outside the maintenance window. This fully utilizes the limited construction time and significantly reduces the impact of maintenance window time restrictions on the overall project schedule, achieving a harmonious balance between construction safety and efficiency. This ensures the feasibility and reliability of the method under busy operating line conditions.

[0024] In this embodiment, the traction device employs a hydraulic traction device, and the traction cable is made of steel strand. The hydraulic traction device features high traction force, high control precision, and good synchronization, which can meet the traction requirements for the smooth sliding of large-tonnage steel box girders. The steel strand, as a flexible traction cable, possesses good flexibility and tensile strength, facilitating connection and arrangement in complex spaces. Furthermore, multi-point synchronous traction can be achieved through parallel connection of multiple steel strands, effectively dispersing traction force and avoiding localized stress concentration. Simultaneously, the flexible connection method can buffer the impact load during start-up and shutdown, ensuring the smoothness and safety of the traction process.

[0025] In this embodiment, before the steel box girder slides into place as a whole, a portion of the steel guide beam is removed to reduce the traction load, based on the sliding distance and the arrangement of temporary supports. By timely removing the steel guide beam segments that have completed their transition support function, the overall traction weight and sliding resistance of the steel box girder are effectively reduced, the load on the traction equipment is lessened, and the additional bending moment and flexural deformation caused by excessively long guide beams are avoided. At the same time, the dismantling work before the subsequent girder is lowered is simplified, improving construction efficiency and economy.

[0026] In this embodiment, the steel box girder is assembled segment by segment from the far end to the near end, and the traction and sliding direction is a unidirectional cumulative advancement from the assembly area to the design position. This assembly sequence ensures that the assembled and slidable segments provide a stable bearing platform and working space for the assembly of subsequent segments, avoiding cross-interference between the assembly and sliding processes. The unidirectional cumulative advancement sliding method ensures the uniqueness and continuity of the traction direction, simplifies the layout and operation of the traction system, and naturally separates the removal of temporary supports from the assembly operation in space, achieving a clear and efficient construction process.

[0027] In this embodiment, in step S3, after the traction device is connected to the traction base, the traction cable is pre-tensioned. Pre-tensioning ensures that the multiple steel strands are evenly stressed, eliminates initial slack, and ensures that all traction points are stressed synchronously when the traction system starts, avoiding starting impact and uneven load caused by inconsistent tension of the traction cable. At the same time, pre-tensioning can test the reliability of the traction connection system, promptly identify potential connection problems, and ensure the safe start and smooth operation of the sliding operation.

[0028] In this embodiment, the steel guide beam is installed at the front end of the steel box girder segment to cross the gap between the temporary support and the permanent pier during the sliding process. Through the forward transition effect of the steel guide beam, the front end of the steel box girder always has a reliable support point during the sliding process. This effectively solves the stress problem of large-span steel box girders when crossing the suspended section between the temporary support and the pier, avoids excessive bending moment and flexural deformation caused by excessive cantilever at the front end of the steel box girder, and ensures the structural safety and stability during the sliding process.

[0029] In this embodiment of the application, step S6, which involves removing or partially removing the rear temporary support, includes: The temporary supports located within the current assembly unit's assembly area are dismantled to provide working space for the assembly of subsequent segments. This dismantling strategy precisely limits the removal of temporary supports to the current assembly area, freeing up space for subsequent segment assembly, avoiding spatial conflicts between assembly operations and temporary supports, while preserving the supporting function of the temporary supports for the already slidable steel box girder. This achieves an orderly cycle of "dismantling one segment, assembling one segment, and sliding one segment," ensuring the continuity and safety of the construction process.

[0030] In this embodiment, step S8 involves lowering the steel box girder onto the permanent pier. Specifically, this is achieved by using vertical jacks or a lowering device to transfer the steel box girder from the temporary support system to the support of the permanent pier for permanent placement. Using vertical jacks or a dedicated lowering device for the lowering operation ensures a smooth and precise descent of the steel box girder in the vertical direction. Through multi-point synchronous control, it is ensured that each support point of the steel box girder is evenly stressed and descends synchronously, avoiding girder distortion or support damage caused by uneven loading or asynchrony during the lowering process, thus guaranteeing the accuracy and quality of permanent placement.

[0031] In this embodiment, the total weight of the steel box girder is not less than 3,000 tons, and the total traction sliding distance is not less than 100 meters. This numerical range clarifies the typical application scenario targeted by the method of this application—the construction of large-tonnage, long-distance cross-line steel box girders. Under such extreme conditions, the traditional one-time traction sliding method is difficult to implement due to insufficient equipment capacity and high safety risks. However, this application effectively solves the key technical problems of bearing capacity, stability, and synchronization in the process of large-tonnage, long-distance traction sliding by organically combining a series of technical means such as partitioned assembly, cumulative sliding, segmented conversion of traction points, and guide beam-assisted crossing of piers. This fully demonstrates the applicability, reliability, and technological advancement of the method of this application.

[0032] In one embodiment of this application, taking a railway bridge project as an example, the total weight of the steel box girder in the project is 3960t, and it needs to cross an existing railway line. The construction method based on partitioned assembly and cumulative traction sliding provided by this invention is used for construction.

[0033] 1. Construction Preparation Along the designed location where the steel box girder will be erected, permanent piers No. 12 (i.e., permanent pier), No. 13, No. 14, and No. 15 are installed. General assembly supports LS1, LS2, and LS3 are erected between piers No. 12 and No. 13 for the assembly of the steel box girder segments. Two sets of temporary supports LS4 and LS5 are installed between piers No. 13 and No. 15 to support the steel box girder and steel guide beam during the sliding process. A traction platform is installed on the top of pier No. 13 along the traction direction, with a total of four traction platforms. Each traction platform is equipped with one XY-QY-195 hydraulic traction device, which is connected to the traction base via steel strands.

[0034] 2. Partition assembly and cumulative sliding In this embodiment, the steel box girder is assembled segment by segment from the far end to the near end, that is, each segment is assembled in the order of F, E, D-1, D-2, C, B, A. The traction and sliding direction is a unidirectional cumulative advancement from the assembly area to the design position. The length of each segment is between 15.893m and 20.892m.

[0035] Step S1: Assemble segment F and slide it for the first time. like Figure 1 As shown, steel box girder segment F is assembled on the main assembly supports LS1, LS2, and LS3. A steel guide beam is installed at the front end of segment F, and traction bases and other equipment are installed at the bottom of the steel box girder and guide beam. The traction device and lifting gear are connected by steel strands and pre-tensioned. The traction device is activated, pulling forward 24.5m. At this point, the front end of the steel guide beam rests on the pad beam at the top of the temporary support LS4. Figure 2 As shown.

[0036] Step S2: Continue sliding Continue to pull and slide forward for 13.8m, as... Figure 3 As shown.

[0037] Step S3: Assemble segment E and change the traction point Dismantle part of the temporary support LS2 to free up assembly space. Assemble segment E in the assembly area, and remove the traction lifting device installed at the end of steel box girder segment F, moving it to the end of segment E for installation, as follows. Figure 4 As shown. After continuing to pull and slide forward for 17.8m, the sliding was paused, as... Figure 5 As shown.

[0038] Step S4: Assemble segments D-1 and D-2 and change the traction point. Assemble segments D-1 and D-2, and remove the traction lifting device installed at the end of steel box girder segment E, then move it to the end of segment D-1 for installation. Figure 6 As shown. Continue pulling and sliding forward for 40.6m. At this point, the end of the steel guide beam is on the temporary support LS5. Pause the sliding, as shown. Figure 7 As shown.

[0039] Step S5: Assemble segment C and change the traction point Assemble segment C, and remove the traction lifting device installed at the end of steel box girder segment D-1, then move it to the end of segment C for installation. Figure 8 As shown. The track was pulled and slid 17.5m towards the greater mileage direction. This section of the track crossing the existing railway line was therefore scheduled to be carried out during the railway maintenance window. Figure 9 As shown.

[0040] Step S6: Assemble segment B and change the traction point Assemble segment B, and remove the traction lifting device installed at the end of steel box girder segment C, then move it to the end of segment B for installation. Figure 10 As shown. The 17.9m traction and sliding movement towards the greater mileage direction was also scheduled during the railway maintenance window, as... Figure 11 As shown.

[0041] Step S7: Assemble segment A and its extension. Partial removal of the steel guide beams reduces the traction load during subsequent slippage. Assemble segment A and the steel box girder extension. Install temporary lifting devices at the bottom of the steel box girder extension. Connect the traction device to the lifting devices using steel strands and pre-tension them. Figure 12 As shown.

[0042] Step S8: Slide the entire assembly to the designed position. The steel box girder was pulled forward and slid to its designed position, a distance of approximately 22.75 meters. This sliding operation was scheduled during a railway maintenance window (2 hours). Figure 13 As shown.

[0043] 3. Lowering the beam into place The temporary supports and steel guide beams are dismantled, and the steel box girder is transferred from the temporary support system to the permanent pier supports using vertical jacks, completing the girder lowering operation. Figure 14 As shown.

[0044] Through the above steps, this embodiment successfully completed the cross-rail traction and sliding construction of a steel box girder with a total weight of 3960t. The entire construction process did not affect the operation of the existing railway, and the sliding process was stable and controllable, verifying the feasibility and superiority of the method of this application.

[0045] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0046] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A construction method based on partitioned assembly and cumulative traction sliding, characterized in that, include: S1: Several sets of permanent piers are set along the design position of the steel box girder to be erected, and several sets of temporary supports are arranged between adjacent permanent piers and in the extension direction of the permanent piers to form a multi-level support system distributed along the sliding direction. S2: Erect the main assembly support in the preset starting area, and set up a traction platform on the top of the permanent pier near the traction side, and install the traction equipment on the traction platform; S3: The steel box girder segments are assembled sequentially on the main assembly support, and a steel guide beam is installed at the front end of the first assembled segment. A traction base is set at the bottom of the steel box girder segments and the steel guide beam. The traction equipment is connected to the traction base through a traction cable. S4: According to the design sequence, the steel box girder is divided into multiple assembly units, each of which consists of at least one segment; each assembly unit is assembled in sequence, and a cumulative sliding method of "assembling one unit and sliding one unit" is adopted, so that the assembled and slid steel box girder segments serve as the bearing platform for the assembly of subsequent segments, and the steel box girder as a whole is gradually pulled forward and slid. S5: During each sliding process, the steel guide beam is used to provide transition support between the temporary support and the permanent pier. After the front end of the steel guide beam is connected to the temporary support or permanent pier in front, it continues to be pulled and slid to the preset position. S6: During the sliding process, depending on the position of the current assembly unit, the temporary support behind is removed or partially removed to release the assembly space, and the traction connection point of the traction equipment is transferred from the end of the segment that has completed the sliding to the end of the current assembly unit to realize the segmented transmission of traction force. S7: Repeat the above operations of assembling the assembly unit, sliding the unit, changing the traction point and removing the temporary support until all steel box girder segments are assembled and tractioned and slid as a whole to the design position directly above it. S8: Remove the temporary supports and steel guide beams, and lower the steel box girder onto the permanent piers to complete the construction.

2. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, During the sliding process, based on the operational requirements of the existing lines within the construction section, the traction and sliding operations of the steel box girder or steel guide beam crossing the existing lines are carried out during the railway maintenance window.

3. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, The traction device is a hydraulic traction device, and the traction cable is a steel strand.

4. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, Before the steel box girder is slid into place as a whole, some of the steel guide beams are removed to reduce the traction load, depending on the sliding distance and the arrangement of temporary supports.

5. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, The steel box girder is assembled segment by segment from the far end to the near end, and the traction and sliding direction is a unidirectional cumulative advancement from the assembly area to the design position.

6. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, In step S3, after the traction device is connected to the traction base, the traction cable is pre-tensioned.

7. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, In step S3, the steel guide beam is installed at the front end of the steel box girder segment to cross the gap between the temporary support and the permanent pier during the sliding process.

8. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, The removal or partial removal of the temporary support structure in step S6 includes: Remove the temporary supports located within the current assembly area of ​​the assembly unit to provide working space for the assembly of subsequent segments.

9. The construction method based on partitioned assembly and cumulative traction sliding according to claim 1, characterized in that, The step S8, which involves lowering the steel box girder onto the permanent pier, specifically includes: using vertical jacks or a lowering device to transfer the steel box girder from the temporary support system to the support of the permanent pier for permanent placement.

10. The construction method based on partitioned assembly and cumulative traction sliding according to any one of claims 1-9, characterized in that, The total weight of the steel box girder shall not be less than 3,000 tons, and the total distance of the traction sliding shall not be less than 100 meters.

Images