Translation construction method for separated viaduct cast-in-place box girder support

Abstract

The invention provides a separation type viaduct cast-in-place box girder support translation construction method, and belongs to the technical field of box girder supports, an upper moving cross beam and multiple sets of bailey beams fixedly arranged on the upper moving cross beam are included, a lower cross beam, a positioning assembly and a driving assembly are further included, and the specific steps include S1, foundation construction and stand column installation, S2, upper moving cross beam installation, S3, lower moving cross beam installation and S4, lower moving cross beam installation. The method comprises the steps of S1, positioning assembly mounting and fixing, S2, Bailey beam erecting and box beam pouring, S5, formwork and positioning assembly dismounting, S6, lower cross beam moving to the next station, S7, box beam pouring construction repeating, and S8, formwork and support dismounting. According to the method, the construction and disassembly workload of the cast-in-place box girder support can be effectively reduced, so that the construction efficiency is improved, and the overall construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of box girder supports, and in particular to a translation construction method for a cast-in-situ box girder support of a separated viaduct. Background Art

[0002] In viaduct construction, when two parallel box girders are cast in place, traditional scaffolding usually needs to cover the entire construction area to ensure the stability of the beam during the casting process. However, when the bridge crosses special terrain such as rivers, mudflats or soft foundations, the workload of scaffolding construction and disassembly will increase significantly, becoming a major challenge in construction. In these complex terrain environments, the foundation of the scaffold is difficult to fix firmly, and may sink or tilt, which in turn affects the safety and quality of construction. At the same time, the construction of the scaffold usually requires a large amount of heavy machinery and manual operation, with a long construction period and high cost. Especially in mudflats or soft foundation areas, the support surface of the scaffold is unstable, and additional support measures may be required to ensure overall stability.

[0003] In addition, when crossing a river, the construction space is limited, and the installation and disassembly of traditional brackets on the water surface are also difficult, which increases the complexity of construction and environmental impact. Therefore, how to optimize the bracket design and reduce the workload during installation and disassembly has become a key technical issue to improve construction efficiency and reduce costs. Summary of the invention

[0004] The object of the present invention is to provide a method for translating the construction of a cast-in-place box girder support of a separated viaduct, which can effectively reduce the workload of erecting and disassembling the cast-in-place box girder support, thereby improving construction efficiency and reducing overall construction costs.

[0005] The embodiments of the present invention are implemented by the following technical solutions: The lifting of the lifting bridge is slidable, and the lifting of the lifting bridge is slidable, and the lifting of the lifting bridge is slidable, and the lifting of the lifting bridge is slidable, and the lifting of the lifting bridge is slidable, The ... S1. Foundation construction and column installation: Drill holes near the piers of the two viaducts according to the design requirements. The drilling depth and diameter shall be determined according to the geological survey report and the design load. Then cast concrete columns to ensure that the verticality error of the columns does not exceed ±5mm. The strength of the concrete shall be C30 or above. Reinforcement bars or connectors shall be reserved at the top of the columns to fix the lower beams. The lower beams shall be fixed and installed on the top of multiple columns to ensure that the lower beams are parallel and the spacing error does not exceed ±10mm. Use a level and a total station to calibrate the horizontality and position of the lower beams to ensure that they are consistent with the design drawings. S2. Installation of upper moving beam: Place the upper moving beam on the lower beam, ensure that the slider is aligned with the rail, and the roller is in close contact with the top wall of the lower beam; S3. Installation and fixation of positioning components: Install the positioning components on the lower beam to ensure that it is stable and reliable, and use the positioning components to fix the upper movable beam to ensure that it does not move during the construction process; S4. Bailey beam erection and box beam casting: Bailey beams are erected on multiple lower beams to ensure that the spacing and height of the Bailey beams meet the design requirements. A torque wrench is used to tighten the Bailey beam connection bolts to ensure a firm connection. Then, the box beam formwork is installed on the Bailey beam. The template joints need to be sealed to prevent leakage. The template position is calibrated using a total station to ensure that it is consistent with the design axis. Then, concrete is poured according to the design requirements, and vibrated layer by layer to ensure density. After pouring, the curing film is covered and watering is carried out for curing. The curing time is not less than 7 days. When the strength reaches more than 75% of the design strength, the next step of construction can be carried out. S5. Disassembly of formwork and positioning components: After the strength of the box beam reaches the design requirements, remove the formwork, clean the residual concrete on the surface of the formwork, and then release the fixation of the upper movable beam to ensure that the beam and positioning components are not damaged during the disassembly process; S6, move the lower beam to the next station: use the driving assembly to move the lower beam and the Bailey beam as a whole to the bottom of another box beam to be cast. During the movement, the position of the beam needs to be monitored in real time to ensure smooth movement and the error is controlled within ±10mm. Then, repeat step S3 and use the positioning assembly to fix the upper moving beam; S7. Repeat box girder pouring construction: reinstall the box girder formwork on the moved Bailey beam, ensure the template position is accurate, pour concrete according to design requirements, and perform maintenance to ensure that the strength meets the design requirements; S8. Disassembly of formwork and support: After the strength of the second box girder reaches the design requirements, remove the formwork, remove the Bailey beam and the lower cross beam, clean up the construction site, ensure the site is clean, and complete the construction.

[0006] Furthermore, the positioning assembly includes a support, a limit column and a tension spring, the support corresponds to the roller one-to-one, an insertion rod is fixedly arranged under the support, and the lower cross beam is provided with a plurality of insertion holes for inserting the insertion rod along the length direction, the support includes a guide portion, a receiving groove and a support portion, the guide portion is used to guide the roller into the receiving groove, and the receiving groove is just for the roller to slide into, a support plate is fixedly arranged on the wheel frame of the roller, the support plate is used to be supported on the support portion, the limit column is vertically slidably penetrated on the support plate, the tension spring is sleeved on the limit column and is used to pull the limit column to keep it extending out of the support plate, and a guiding inclined surface is provided on the side of the limit column close to the corresponding support portion.

[0007] Furthermore, a protruding transition portion is formed between the accommodating groove and the guiding portion, and the protruding transition portion is detachably arranged on the support, and the bottom of the protruding transition portion is arranged to be inclined downward, and the bottom of the protruding transition portion is higher on a side close to the supporting portion than on a side away from the supporting portion.

[0008] Furthermore, a clamping block is fixedly provided at the bottom of the protruding transition part, and a clamping groove which is engaged with the clamping block is provided on the contact surface with the protruding transition part, one end of the clamping groove is closed and the other end is open, and a pull ring is fixedly provided on the clamping block.

[0009] Furthermore, a lug plate is fixedly provided on the support, and the lug plate is fixed to the lower cross beam by expansion bolts.

[0010] Furthermore, the driving components are arranged at both ends of the lower cross beam, and the driving components include a hydraulic jack and a steel wire rope. The hydraulic jack is fixed to the end of the lower cross beam through a frame, one end of the steel wire rope is fixedly connected to the lower cross beam, and the other end is connected to the output end of the hydraulic jack.

[0011] Furthermore, the steel wire rope is made of precision-rolled threaded steel.

[0012] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: 1. The present invention solves the problems of difficult construction and disassembly, long construction period and high cost of traditional supports in complex terrain (such as river channels, tidal flats, soft foundations, etc.) by optimizing the support design and construction steps; specifically, the modular lower crossbeam, upper movable crossbeam and Bailey beam combined structure are convenient for rapid installation and disassembly, the lower crossbeam is fixed to the ground by a column, the column can adjust the height and foundation form according to the terrain to adapt to complex terrain, the lower crossbeam and Bailey beam are driven by the driving assembly to move to the next workstation as a whole, the support system can move quickly between the two box beams, avoiding the problem that the traditional support needs to cover the entire construction area, significantly reducing the workload of support construction and disassembly, and the positioning assembly is used to accurately fix the upper movable crossbeam to ensure the stability of the support during construction; At the same time, the positioning components can be quickly installed and disassembled to improve construction efficiency, and the column foundation can adopt different reinforcement methods (such as pile foundation, expanded foundation, etc.) according to the terrain conditions to ensure the stability of the bracket in complex terrains such as soft foundations, tidal flats or rivers; secondly, the columns do not need to be broken down in the later stage, and the complex terrains such as soft foundations, tidal flats or rivers can be directly reinforced, and it plays a role in reinforcing the bridge piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of the structure of the foundation construction and column installation provided by the present invention; Figure 2 A schematic diagram of the working process of moving the lower crossbeam to the next workstation provided by the present invention; Figure 3 A schematic diagram of the structure after the lower crossbeam provided by the present invention is moved to the next workstation; Figure 4 For the present invention Figure 3 A magnified view of part A; Figure 5 The present invention is intended to show a side view of a cast-in-situ box girder support of a separated viaduct; Figure 6 For the present invention Figure 5 A magnified view of part A; Figure 7 This is a schematic diagram of the structure of the positioning assembly for the purpose of illustrating the present invention; Figure 8 This is a schematic diagram of the structure of the present invention to show that the roller has not yet entered the receiving groove; Fig. 9 The present invention is intended to show an exploded view of the protruding transition portion and the insertion rod; Icons: 1-upper moving beam, 11-Bailey beam, 12-slider, 2-column, 21-lower beam, 211-slide rail, 212-roller, 2121-wheel frame, 2122-support plate, 213-socket, 3-positioning assembly, 31-support, 310-insertion rod, 311-guide part, 312-accommodating groove, 313-support part, 314-protruding transition part, 315-block, 3151-pull ring, 316-slot, 317-ear plate, 318-expansion bolt, 32-limiting column, 321-guide ramp, 33-tension spring, 4-drive assembly, 41-hydraulic jack, 411-frame, 42-wire rope, 5-movable gap. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0017] The following is further described in conjunction with specific embodiments. Figure 1-Figure 9 As shown, the present invention is a construction method for translation of a cast-in-place box beam support for a separated viaduct, the box beam support comprises an upper movable cross beam 1 and a plurality of groups of Bailey beams 11 fixedly mounted on the upper movable cross beam 1, the installation of the Bailey beam 11 belongs to the prior art and will not be described in detail here, the viaduct is precast with a plurality of columns 2 near the bottom of the pier, and a lower cross beam 21 is detachably fixedly mounted on the column 2, for example, by means of a screw, a hoop or the like, and of course, the lower cross beam 21 can also be directly cast and fixed; The lower cross beam 21 is perpendicular to the two parallel box beams to be poured and is arranged horizontally. The lower cross beam 21 is installed with multiple beams, which can be specifically arranged according to needs. A slide rail 211 is fixedly installed on the top of the lower cross beam 21. The cross section of the slide rail 211 is square. The upper movable cross beam 1 is slidably arranged on the lower cross beam 21 through a slider 12. The slider 12 is 'n' shaped to ensure that the slider 12 can have a movable gap 5 for vertical movement on the slide rail 211. A plurality of rollers 212 are fixedly arranged on the bottom of the upper movable cross beam 1 along the length direction. The rollers 212 are arranged in contact with the lower cross beam 21 during the movement. A plurality of positioning components 3 are detachably arranged on the lower cross beam 21. The positioning components 3 are used to fix the lower cross beam 21 directly under any pair of box beams to be poured. In addition, a driving component 4 is also arranged on the lower cross beam 21. The driving component 4 is used to drive the lower cross beam 21 from directly under one of the box beams to be poured to directly under another box beam to be poured. The specific steps include: S1. Foundation construction and installation of columns 2: Drill holes according to design requirements near the piers of the two viaducts. The drilling depth and diameter shall be determined according to the geological survey report and the design load. Then pour concrete columns 2 to ensure that the verticality error of columns 2 does not exceed ±5mm. The strength of concrete is C30 or above. Reinforcement bars or connectors are reserved at the top of columns 2 to fix the lower beams 21. The lower beams 21 are fixed and installed on the tops of multiple columns 2 to ensure that the lower beams 21 are parallel side by side with a spacing error of no more than ±10mm. Use a level and a total station to calibrate the horizontality and position of the lower beams 21 to ensure that they are consistent with the design drawings. S2. Install the upper movable beam 1: Place the upper movable beam 1 on the lower beam 21, ensure that the slider 12 is aligned with the slide rail 211, and the roller 212 is in close contact with the top wall of the lower beam 21; S3, installation and fixation of the positioning component 3: Install the positioning component 3 (such as bolts, buckles or hydraulic fixing devices) on the lower crossbeam 21 to ensure that it is stable and reliable, and use the positioning component 3 to fix the upper movable crossbeam 1 to ensure that it does not move during the construction process; S4, Bailey beam 11 erection and box beam casting: Bailey beam 11 is erected on multiple lower beams 21, ensuring that the spacing and height of Bailey beam 11 meet the design requirements, and the connection bolts of Bailey beam 11 are tightened with a torque wrench to ensure a firm connection. Then, the box beam template is installed on the Bailey beam 11. The template joints need to be sealed to prevent leakage. The template position is calibrated with a total station to ensure that it is consistent with the design axis. Then, concrete is poured according to the design requirements, and vibrated layer by layer to ensure density. After pouring, the curing film is covered and watering is carried out for curing. The curing time is not less than 7 days. When the strength reaches more than 75% of the design strength, the next step of construction can be carried out; S5, disassembly of the formwork and positioning assembly 3: after the strength of the box beam reaches the design requirements, the formwork is removed, the residual concrete on the surface of the formwork is cleaned, and then the fixing of the upper movable beam 1 is released to ensure that the beam and positioning assembly 3 are not damaged during the disassembly process; S6, move the lower beam 21 to the next station: use the driving component 4 (such as a hydraulic jacking device) to move the lower beam 21 and the Bailey beam 11 as a whole to the right below another box beam to be cast. During the movement, the position of the beam needs to be monitored in real time to ensure smooth movement and the error is controlled within ±10mm. Then, repeat step S3 and use the positioning component 3 to fix the upper movable beam 1; S7, repeat box beam pouring construction: reinstall the box beam template on the moved Bailey beam 11, ensure the template position is accurate, pour concrete according to design requirements, and perform maintenance to ensure that the strength meets the design requirements; S8. Disassembly of formwork and support: After the strength of the second box girder reaches the design requirements, remove the formwork, remove the Bailey beam 11 and the lower cross beam 21, clean up the construction site, ensure that the site is clean, and complete the construction.

[0018] As an optional embodiment, refer to Figure 4-Figure 9 As shown, the positioning assembly 3 of the present invention includes a support 31, a limiting column 32 and a tension spring 33, and the support 31 corresponds to the roller 212 one by one. A plug rod 310 is fixedly welded below the support 31. The shape of the plug rod 310 can be circular or other special shapes. In this embodiment, the circular shape is selected because it is easy to process. The lower cross beam 21 is provided with a plurality of plug holes 213 for inserting the plug rod 310 along the length direction. The plug rod 310 and the plug hole 213 can play a positioning role to ensure the stability and overall strength of the support 31. The support 31 includes a guide portion 311, a receiving groove 312 and a support portion 313, wherein the guide portion 311 is used to guide the roller 212 to enter the receiving groove 312, and the receiving groove 312 is just for the roller 212 to slide and snap in.

[0019] A support plate 2122 is fixedly welded on the wheel frame 2121 of the roller 212. The support plate 2122 is installed horizontally and is used to be supported on the support portion 313. The limit column 32 is vertically slidably penetrated on the support plate 2122. The tension spring 33 is sleeved on the limit column 32 and is used to pull the limit column 32 to keep extending out of the support plate 2122. One end of the tension spring 33 is fixedly welded on the top of the limit column 32, and the other end is fixedly welded on the support plate 2122. A guide inclined surface 321 is provided on one side of the limit column 32 close to the corresponding support portion 313. Due to the presence of the limit column 32 and the tension spring 33, when the roller 212 enters the receiving groove 312, the support plate 2122 will automatically abut against the support portion 313, thereby automatically supporting the entire Bailey beam 11 and the upper movable crossbeam 1. The receiving groove 312 limits the roller 212 to prevent the roller 212 from moving at will. At the same time, due to the existence of the guiding inclined surface 321 , the limiting column 32 can move upward smoothly after contacting the supporting portion 313 , so that after the supporting plate 2122 is in place, the limiting column 32 pops out and resets under the action of the tension spring 33 , further limiting the roller 212 .

[0020] In addition, the installation timing of the positioning component 3 is very critical. When the roller 212 is about to be in place, the positioning component 3 should be installed in front of the roller 212. This ensures that before the roller 212 slides into the receiving groove 312, the positioning component 3 can intervene in advance to provide the necessary support and limit function. Through this precise installation timing, it can be ensured that the roller 212 smoothly enters the receiving groove 312 and is accurately positioned, avoiding the roller 212 from being misplaced or unable to be fixed smoothly due to the failure to install the positioning component 3 in time, and ensuring the stability and accuracy of the bracket during the construction process.

[0021] It should be emphasized that the movable gap 5 between the slider 12 and the slide rail 211 is the upward distance between the Bailey beam 11 and the upper movable beam 1. The main purpose of setting the upward distance is to facilitate demoulding. During the demoulding process, if the Bailey beam 11 and the upper movable beam 1 are lowered as a whole, it can facilitate their overall movement and avoid being stuck by the box beam, thereby improving construction efficiency and safety.

[0022] As an optional embodiment, a protruding transition portion 314 is formed between the accommodating groove 312 and the guide portion 311. The protruding transition portion 314 is detachably arranged on the support 31. The bottom of the protruding transition portion 314 is arranged to be inclined downward, and the bottom of the protruding transition portion 314 is arranged closer to the support portion 313 than the side away from the support portion 313. In this way, after removing the protruding transition portion 314, the roller 212 can automatically roll down under the action of the inclined surface, thereby playing a labor-saving role. Due to the inclined design, the roller 212 can roll down smoothly using gravity, reducing the difficulty and effort of manual operation. At the same time, the structural design of the protruding transition portion 314 can lift the roller 212, ensuring that the support plate 2122 can smoothly contact the support portion 313, providing a stable support effect. This design effectively improves the precise docking of the support portion 313 and avoids inaccurate construction caused by unstable support.

[0023] Reference Figure 8 and Fig. 9 As shown, in order to facilitate the disassembly of the protruding transition part 314, a block 315 is welded at the bottom of the protruding transition part 314. The cross section of the block 315 is a T-shaped or dovetail-shaped anti-slip shape. A slot 316 that is engaged with the block 315 is provided on the contact surface with the protruding transition part 314. The length direction of the slot 316 is perpendicular to the moving direction of the roller 212. One end of the slot 316 is closed and the other end is open. In this way, the block 315 and the slot 316 are precisely aligned to ensure the tight combination of the protruding transition part 314 and the support 31. When disassembly is required, the design of the block 315 and the slot 316 allows the operator to easily achieve positioning and separation, avoiding the problem of stagnation or damage between the transition part and the support 31.

[0024] In order to further improve the convenience of operation and disassembly efficiency, a pull ring 3151 is fixedly welded on the clamping block 315. The design of the pull ring 3151 facilitates the application of force to remove the protruding transition portion 314. The operator can apply appropriate force through the pull ring 3151 to disengage the clamping block 315 from the clamping slot 316, and then remove the protruding transition portion 314. The entire disassembly process is simple and efficient, and does not require too many tools or special operations, greatly improving the construction efficiency. During the disassembly process, due to the design of the pull ring 3151, the operator can more conveniently control the distribution of force and reduce damage to the transition portion or other components.

[0025] Reference Figure 8As shown, the support 31 is fixedly welded with an ear plate 317, and the ear plate 317 is fixed to the lower beam 21 by an expansion bolt 318. In other implementations, a clamp, a steel wire or other structure may also be used for binding and fixing to achieve a stable connection with the lower beam 21. The fixing method of the ear plate 317 and the expansion bolt 318 ensures an efficient connection between the support 31 and the lower beam 21, and provides reliable support in terms of the bearing capacity and stability of the bracket. At the same time, the method of binding and fixing with a clamp or steel wire provides flexibility and adaptability for installation under different construction environments and conditions, is easy to operate, and can quickly respond to changing needs on site.

[0026] Reference Figure 2 and Figure 3 As shown, the drive assembly 4 is arranged at both ends of the lower beam 21, and the drive assembly 4 includes a hydraulic jack 41 and a steel wire rope 42. The hydraulic jack 41 is fixed to the end of the lower beam 21 through a frame 411, one end of the steel wire rope 42 is fixedly connected to the lower beam 21, and the other end is connected to the output end of the hydraulic jack 41. The hydraulic jack 41 and the steel wire rope 42 are installed at both ends of the lower beam 21, and the hydraulic jack 41 and the steel wire rope 42 on one side are pulled, and the hydraulic jack 41 and the steel wire rope 42 on the other side are synchronously loosened. Through this design, the drive assembly 4 can provide uniform tension and control, thereby ensuring that the Bailey beam 11 and the upper movable beam 1 move smoothly and stably as a whole. This method effectively avoids structural dislocation or deformation caused by uneven tension, and ensures the precise positioning of the beam during construction.

[0027] As an optional embodiment, the steel wire rope 42 is made of finely rolled threaded steel. Finely rolled threaded steel has high tensile strength and excellent corrosion resistance, which can effectively improve the service life and load-bearing capacity of the steel wire rope 42. In a high-intensity working environment, finely rolled threaded steel can resist fatigue damage caused by high loads, and its excellent wear resistance ensures the reliability of the steel wire rope 42 in long-term use. Using finely rolled threaded steel as the material of the steel wire rope 42 not only improves the safety of the system, but also greatly reduces the maintenance and replacement frequency, thereby reducing the construction cost.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for translating a cast-in-place box beam support of a separated viaduct, the box beam support comprising an upper movable cross beam (1) and a plurality of groups of Bailey beams (11) fixedly arranged on the upper movable cross beam (1); a plurality of columns (2) are precast near the lower part of the viaduct below the pier; a lower cross beam (21) is fixedly arranged on the column (2); the lower cross beam (21) is perpendicular to two parallel box beams to be cast and is arranged horizontally; a slide rail (211) is fixedly installed on the top of the lower cross beam (21); the upper movable cross beam (1) is slidably arranged on the lower cross beam (21) through a slider (12); The bottom of the upper movable crossbeam (1) is fixedly provided with a plurality of rollers (212) along the length direction, the rollers (212) are arranged in contact with the lower crossbeam (21), the lower crossbeam (21) is detachably provided with a plurality of positioning components (3), the positioning components (3) are used to fix the lower crossbeam (21) directly below any pair of box beams to be cast, and in addition, the lower crossbeam (21) is also provided with a driving component (4), the driving component (4) is used to drive the lower crossbeam (21) from directly below one pair of box beams to be cast to directly below another pair of box beams to be cast, and is characterized in that: The specific steps include: S1. Foundation construction and installation of columns (2): Drill holes according to design requirements near the piers of the two viaducts. The drilling depth and diameter shall be determined according to the geological survey report and the design load. Then, cast concrete columns (2). Ensure that the verticality error of the columns (2) does not exceed ±5 mm. The strength of the concrete is C30 or above. Reinforcement bars or connectors are reserved at the top of the columns (2) to fix the lower beams (21). The lower beams (21) are fixed and installed on the tops of multiple columns (2). Ensure that the lower beams (21) are parallel and the spacing error does not exceed ±10 mm. Use a level and a total station to calibrate the horizontality and position of the lower beams (21) to ensure that they are consistent with the design drawings. S2. Installation of the upper movable crossbeam (1): Place the upper movable crossbeam (1) on the lower crossbeam (21), ensure that the slider (12) is aligned with the slide rail (211), and the roller (212) is in close contact with the top wall of the lower crossbeam (21); S3, installation and fixation of the positioning assembly (3): the positioning assembly (3) is installed on the lower beam (21) to ensure that it is stable and reliable, and the positioning assembly (3) is used to fix the upper movable beam (1) to ensure that it does not move during the construction process; S4, Bailey beam (11) erection and box beam casting: Bailey beams (11) are erected on multiple lower cross beams (21), ensuring that the spacing and height of the Bailey beams (11) meet the design requirements, and the Bailey beam (11) connection bolts are tightened with a torque wrench to ensure that the connection is firm. Then, the box beam template is installed on the Bailey beam (11). The template joints need to be sealed to prevent leakage. The template position is calibrated using a total station to ensure that it is consistent with the design axis. Then, concrete is poured according to the design requirements, and vibrated layer by layer to ensure density. After the pouring is completed, the curing film is covered and watering is carried out for curing. The curing time is not less than 7 days. When the strength reaches more than 75% of the design strength, the next step of construction is carried out; S5, disassembly of the formwork and positioning assembly (3): after the strength of the box beam reaches the design requirements, the formwork is removed, the residual concrete on the surface of the formwork is cleaned, and then the fixing of the upper movable beam (1) is released to ensure that the beam and the positioning assembly (3) are not damaged during the disassembly process; S6, moving the lower crossbeam (21) to the next station: using the driving assembly (4) to move the lower crossbeam (21) and the Bailey beam (11) as a whole to the position directly below another box beam to be cast, during which the position of the crossbeam needs to be monitored in real time to ensure smooth movement and an error within ±10 mm, then repeating step S3 and fixing the upper moving crossbeam (1) using the positioning assembly (3); S7, repeat box beam pouring construction: reinstall the box beam template on the moved Bailey beam (11), ensure the template position is accurate, pour concrete according to design requirements, and perform curing to ensure that the strength meets the design requirements; S8, template and support removal: After the strength of the second box girder reaches the design requirements, the template is removed, the Bailey beam (11) and the lower cross beam (21) are removed, the construction site is cleaned up, the site is ensured to be clean, and the construction is completed.

2. The method for translating the cast-in-situ box girder support of a separated viaduct according to claim 1 is characterized in that: The positioning assembly (3) comprises a support (31), a limiting column (32) and a tension spring (33); the support (31) corresponds to the roller (212) in a one-to-one manner; an insertion rod (310) is fixedly arranged below the support (31); the lower cross beam (21) is provided with a plurality of insertion holes (213) for inserting the insertion rod (310) along the length direction; the support (31) comprises a guiding portion (311), a receiving groove (312) and a supporting portion (313); the guiding portion (311) is used to guide the roller (212) into the receiving groove (312); the receiving groove ( The roller (212) is just for the roller (212) to slide and snap into, a support plate (2122) is fixedly arranged on the wheel frame (2121) of the roller (212), the support plate (2122) is used to be supported on the support portion (313), the limit column (32) is vertically slidably penetrated on the support plate (2122), the tension spring (33) is sleeved on the limit column (32) and is used to pull the limit column (32) to keep extending out of the support plate (2122), and a guiding inclined surface (321) is arranged on the side of the limit column (32) close to the corresponding support portion (313).

3. The construction method for translation of cast-in-situ box girder support of separated viaduct according to claim 2 is characterized in that: A protruding transition portion (314) is formed between the accommodating groove (312) and the guiding portion (311); the protruding transition portion (314) is detachably arranged on the support (31); the bottom of the protruding transition portion (314) is arranged to be inclined downward; and the bottom of the protruding transition portion (314) is arranged at a side closer to the supporting portion (313) than at a side farther from the supporting portion (313).

4. The construction method for translation of cast-in-situ box girder support of separated viaduct according to claim 3 is characterized in that: A clamping block (315) is fixedly arranged at the bottom of the protruding transition portion (314), and a clamping groove (316) for clamping with the clamping block (315) is provided on the contact surface with the protruding transition portion (314), one end of the clamping groove (316) is closed and the other end is open, and a pull ring (3151) is fixedly arranged on the clamping block (315).

5. The construction method for translation of cast-in-situ box girder support of separated viaduct according to claim 3 is characterized in that: A lug plate (317) is fixedly provided on the support (31), and the lug plate (317) is fixed to the lower cross beam (21) via an expansion bolt (318).

6. The construction method for translation of cast-in-situ box girder support of separated viaduct according to claim 1 is characterized in that: The driving assembly (4) is arranged at both ends of the lower cross beam (21), and the driving assembly (4) comprises a hydraulic jack (41) and a steel wire rope (42). The hydraulic jack (41) is fixed to the end of the lower cross beam (21) through a frame (411), one end of the steel wire rope (42) is fixedly connected to the lower cross beam (21), and the other end is connected to the output end of the hydraulic jack (41).

7. The method for translational construction of cast-in-situ box girder support of a separated viaduct according to claim 6 is characterized in that: The steel wire rope (42) is made of precision-rolled threaded steel.

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