Large cantilever flange single-box single-chamber cast-in-place box girder hanging basket cantilever casting system and construction method

Abstract

The invention provides a large-cantilever-flange single-box single-chamber cast-in-place box girder hanging basket cantilever casting system and a construction method, and the construction method comprises the following steps: pre-embedding a screw rod in a pier column in the early stage of construction, and connecting an anchoring hook bar and a pre-embedded steel plate to make preparation for connection of a steel shoe bracket; when the 0 # block box girder is constructed, the steel shoe corbel bracket formwork system is installed through the embedded screws, and 0 # block pouring is completed. And in the suspension pouring construction stage, a hanging basket comprising a hanging basket truss, a post-anchoring system, a suspension system and a pre-pressing system is built, and box girder suspension pouring is carried out after pre-pressing. After pouring of the concrete box girder is completed, the hanging basket is transformed into a lifting appliance, an installation lifting jack, a transverse moving jack and other parts and used for lifting of a steel-concrete combined section girder and a steel box girder section. According to the construction method, all construction steps are closely connected, all parts of a construction system operate cooperatively, construction of the large-cantilever-flange single-box single-chamber cast-in-place box girder and the large-span box girder is effectively achieved, and the construction method has the advantages of being safe and efficient in construction, stable in structure and the like.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, and in particular to a hanging basket suspended casting system and a construction method for a large cantilever flange single-box single-chamber cast-in-place box beam. Background Art

[0002] In bridge construction, the construction of long-span bridges has always been the focus and difficulty in the engineering field. For the construction of single-box single-chamber cast-in-place box girders with large cantilever flanges, traditional construction methods have many problems. For example, when constructing 0# box girders, the traditional support system is not stable enough to withstand large construction loads, which easily leads to safety hazards during the construction process, and the construction accuracy is difficult to ensure, affecting the overall quality of the box girder.

[0003] In terms of hanging basket suspended pouring construction, the existing hanging basket system rear anchoring system, suspension system and preloading system are not designed properly. The connection method of the rear anchoring system is not flexible enough, and the operation is cumbersome during the forward movement of the hanging basket, and the safety is difficult to guarantee; the suspension system has limited load dispersion capacity, which is easy to cause local stress concentration, affecting the service life of the hanging basket and construction safety; the preloading system cannot accurately adjust the stress state of the hanging basket, resulting in unsatisfactory preloading effect, affecting the quality of subsequent box beam hanging pouring.

[0004] In addition, in the hoisting process of long-span box girders, traditional hoisting equipment and methods are difficult to meet the high-precision hoisting requirements of steel-concrete composite section beams and steel box girder sections, the hoisting efficiency is low, and it is difficult to ensure the accurate positioning of the beam sections, which increases the construction cost and construction period. Therefore, a new construction method and system is urgently needed to solve the above problems existing in the existing technology. Summary of the invention

[0005] The object of the present invention is to provide a large cantilever flange single-box single-chamber cast-in-place box girder hanging basket suspended casting system and construction method to solve the above-mentioned technical problems.

[0006] In order to solve the above technical problems, the present invention provides a construction method of a large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system, comprising the following steps:

[0007] Step 1: Pre-construction preparation;

[0008] Step 2: Construction of 0# box beam;

[0009] Step 3: Cast-in-place box girder with large cantilever flange and single box and single chamber;

[0010] Step 4: Transformation of hanging basket and hoisting construction of large-span steel-concrete composite beam and steel box beam;

[0011] Among them, step one includes: before pouring the pier column, installing multiple embedded screws in the pier column, and connecting anchor hook bars to the embedded screws; connecting the embedded steel plate with the embedded screws, and pre-burying it in the pier column so that both ends of the embedded screws extend out of the pier column, providing a basis for the connection of the steel boot corbel.

[0012] Step 2 includes: S21, after the pier construction is completed, the embedded screw rod is passed through the steel boot bracket, the steel boot bracket is connected to the embedded steel plate of the pier column, and a gasket is set at the anchoring end of the embedded screw rod;

[0013] S22, installing the bracket upright support and the bracket diagonal support, and connecting the ends of the bracket upright support and the bracket diagonal support to the steel boot brackets respectively, wherein the bracket upright support is vertically arranged on the side of the pier column, so that the bracket upright support and the bracket diagonal support support the main beam;

[0014] S23. Install distribution beams, trusses, and corrugated beams on the main beams in sequence, so that the corrugated beams support the bottom of the formwork, and use brackets to support the sides of the formwork, thereby completing the support system for the 0# block formwork.

[0015] Step 2 also includes, S24, using the constructed steel boot corbel and formwork to cast the 0# box girder.

[0016] Step three includes, S31, installing the hanging basket truss, and sequentially constructing the rear anchoring system, the suspension system and the preloading system;

[0017] S32, installation of rear anchoring system: reserve anchors in the concrete box girder at the rear side of the hanging basket truss, connect the anchoring end plate at the bottom end of the tie rod to the anchor, connect the tie rope at the top of the tie rod through a threaded sleeve, and connect the end of the tie rope away from the threaded sleeve to the connector at the rear end of the hanging basket truss; reserve an embedded support frame in the concrete box girder at the bottom of the rear end of the hanging basket truss, connect the fixing frame at the top of the embedded support frame through an adapter, and connect the fixing frame to the connector at the rear end of the hanging basket truss through the rear anchor, so as to form a pull anchor system and a lower anchor system;

[0018] S33, installation of suspension system: anchor the upper end of the rear sling to the connector of the basket truss, anchor the upper end of the front sling to the front upper beam of the basket truss, anchor the lower parts of the rear sling and the front sling to the two ends of the front lower beam respectively, and fix the front lower beam to the lower side of the concrete box beam, so that the front lower beam constitutes the bearing frame at the bottom of the basket truss;

[0019] S34. Installation of prestressing system: embed anchor frames in concrete box beams, connect the embedded anchor frames with reaction frames through connecting columns, fix the bottom beam of the reaction frame to the embedded anchor frames, set a counter-pressure steel plate on the top of the bottom beam, pass tie bars through the connecting columns and anchor the top of the tie bars to the counter-pressure steel plate; install a downward pressure jack on the cantilever side of the reaction frame, and install an upward pressure jack between the upper part of the front sling and the front upper cross beam.

[0020] Step three also includes, S35, applying a preload to the hanging basket: providing downward pressure through a downward pressure jack to act on the counter-pressure balance beam at the front lower cross beam, and then acting on the front lower cross beam through the counter-pressure balance beam to achieve preload, and using the upward pressure jack on the upper part of the front sling to adjust the stress state of the hanging basket truss during the preload process;

[0021] S36. After preloading is completed, the formwork is installed using the hanging basket truss to perform the cast-in-place box beam with a single box and a single chamber with a large cantilever flange;

[0022] S37. After the casting and curing of the segmental box girder is completed, the hanging basket truss is moved forward to the designated position for the suspended casting of the next segmental large cantilever flange single-box single-chamber cast-in-place box girder.

[0023] Step 4 includes, S41, after the concrete box girder is poured, transforming the hanging basket truss into a hoisting device for lifting and hoisting the large-span box girder;

[0024] S42. Install a lifting jack on the top of the sling to provide vertical lifting force; install a transverse jack between the upper part of the front upper crossbeam and the lifting jack to move the lifting jack transversely and drive the lifting rod and the steel-concrete combined section beam to adjust their positions transversely;

[0025] S43, connecting the upper part of the lifting rod to the lifting jack, connecting the lower part to the positioning frame, installing the connecting ear plate on the positioning frame through the connecting bolt, installing the sling on the connecting ear plate as a connecting node, and connecting the sling to the lifting ring on the top of the steel-concrete combined section beam;

[0026] S44. Install a lifting sleeve on the positioning frame, pass the lifting rod through the lifting sleeve, install an adjusting diagonal rod between the connecting shafts at the corresponding positions of the positioning frame on both sides of the lifting sleeve, and use the adjusting diagonal rod to adjust the balance of the positioning frame.

[0027] Step 4 also includes, S45, using the modified lifting device to lift the steel-concrete composite section beam by a lifting jack, and using a transverse jack to perform transverse positioning.

[0028] The invention also discloses a large cantilever flange single-box single-chamber cast-in-place box girder hanging basket suspended casting system, which is obtained by construction according to the construction method of the large cantilever flange single-box single-chamber cast-in-place box girder hanging basket suspended casting system.

[0029] The beneficial effects of the present invention are:

[0030] 1) The steel boot corbel bracket formwork system of the present invention provides a solid and reliable supporting foundation for the construction of 0# box beams through the cooperation of pre-embedded screws, anchor hook bars and pre-embedded steel plates.

[0031] 2) The rear anchoring system of the hanging basket is cleverly designed. The rear connection structures of the pulling anchoring system and the lower anchoring system can be flexibly disassembled. When the hanging basket moves forward, it can not only maintain the connection of the pulling anchoring system to ensure safety, but also easily release the lower anchoring system. The operation is simple and quick, which effectively improves the construction efficiency, shortens the construction period, and provides a strong guarantee for the rapid advancement of the project.

[0032] 3) The downward pressure jack and the upward pressure jack in the preloading system work together to accurately adjust the stress state of the hanging basket, making the preloading effect more ideal.

[0033] 4) The hanging basket was innovatively transformed into a hoist for lifting and hoisting large-span box girders, realizing the multifunctional application of a set of equipment in different construction stages. This not only reduces the purchase and rental costs of equipment, but also avoids the waste of time and manpower caused by equipment replacement, greatly improves resource utilization and reduces construction costs.

[0034] 5) The construction method and system of the present invention have wide applicability and can adapt to the needs of large-span bridge construction under different geological conditions and construction environments, providing a more universal solution for the development of the bridge engineering field. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the installation diagram of the 0# steel boot bracket formwork system;

[0036] Figure 2 This is a detailed schematic diagram of the embedded anchor system of the steel boot corbel;

[0037] Figure 3 This is a schematic diagram of the installation of a hanging basket for cast-in-place box beams with large cantilever flanges and single-box and single-chamber.

[0038] Figure 4 It is a detailed schematic diagram of the preloading system;

[0039] Figure 5 This is a schematic diagram of the installation of the hanging basket modification sling;

[0040] Figure 6 Detailed diagram of the sling.

[0041] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0042] In the figure: 1. pier column; 2. 0# box beam; 3. embedded screw rod; 4. anchor hook; 5. embedded steel plate; 6. gasket; 7. steel boot corbel; 8. bracket support; 9. bracket diagonal support; 10. main beam; 11. distribution beam; 12. truss; 13. corrugated beam; 14. bracket; 15. formwork; 16. concrete box beam; 17. hanging basket truss; 18. anchor; 19. anchor end plate; 20. tie rod; 21. threaded sleeve; 22. tie rope; 23. connector; 24. embedded support frame; 25. adapter; 26. fixing frame; 27. rear anchor; 28. Rear sling; 29. ​​Front sling; 30. Front upper crossbeam; 31. Front lower crossbeam; 32. Upper pressure jack; 33. Reaction frame; 34. Embedded anchor frame; 35. Connecting column; 36. Tie reinforcement; 37. Bottom beam; 38. Counter-pressure steel plate; 39. Counter-pressure balance beam; 40. Lower pressure jack; 41. Steel-concrete combined section beam; 42. Lifting jack; 43. Transverse jack; 44. Lifting rod; 45. Lifting sleeve; 46. Connecting shaft; 47. Adjusting diagonal rod; 48. Connecting bolt; 49. Positioning frame; 50. Connecting ear plate; 51. Lifting device; 52. Lifting ring. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0044] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0045] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0046] like Figure 1-Figure 6 The present invention provides a construction method for a large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system, comprising the following steps:

[0047] It includes step 1: pre-construction preparation, step 2: construction of 0# box girder 2, step 3: suspended casting construction of single-box single-chamber cast-in-place box girder with large cantilever flange, and step 4: hanging basket transformation and hoisting construction of large-span steel-concrete composite section beam 41 and steel box girder section.

[0048] The pre-construction preparation steps are as follows: before pouring the pier 1, install multiple embedded screws 3 in the pier 1, and connect anchor hooks 4 to the embedded screws 3 to enhance the connection strength between the embedded steel plate 5 and the pier 1; connect the embedded steel plate 5 to the embedded screws 3 by bolts, and pre-embed it in the pier 1 to ensure that both ends of the embedded screws 3 extend out of the pier 1, providing a basis for the subsequent connection of the steel boot corbel 7.

[0049] The construction steps of 0# box beam 2 are as follows:

[0050] S21, after the construction of the pier column 1 is completed, the embedded screw rod 3 is passed through the steel shoe bracket 7, the steel shoe bracket 7 is connected to the embedded steel plate 5 of the pier column 1, and a gasket 6 is arranged at the anchoring end of the embedded screw rod 3;

[0051] S22, installing the bracket support 8 and the bracket diagonal support 9, so that their ends are connected to the steel boot bracket 7 respectively, wherein the bracket support 8 is vertically arranged on the side of the pier 1, so that the bracket support 8 and the bracket diagonal support 9 support the main beam 10 and transfer the load of the main beam 10 to the pier 1;

[0052] S23, sequentially install the distribution beam 11, the truss 12, and the corrugated beam 13 on the main beam 10, so that the corrugated beam 13 supports the bottom of the template 15, and uses the bracket 14 to support the side of the template 15, thereby completing the support system of the 0# block template 15;

[0053] S24, use the constructed steel boot corbel 7 and formwork 15 to cast the 0# box beam 2.

[0054] The construction steps of cast-in-place box beam with large cantilever flange and single box and single chamber are as follows:

[0055] S31, installing the hanging basket truss 17, and sequentially constructing the rear anchoring system, the suspension system and the preloading system;

[0056] S32, installation of the rear anchoring system: reserve an anchor 18 in the concrete box girder 16 at the rear side of the hanging basket truss 17, connect the anchor end plate 19 at the bottom end of the tie rod 20 to the anchor 18, connect the tie rope 22 to the top of the tie rod 20 through a threaded sleeve 21, and connect the end of the tie rope 22 away from the threaded sleeve 21 to the connector 23 at the rear end of the hanging basket truss 17; reserve an embedded support frame 24 in the concrete box girder 16 at the bottom of the rear end of the hanging basket truss 17, connect the fixing frame 26 to the top of the embedded support frame 24 through an adapter 25, and connect the fixing frame 26 to the connector 23 at the rear end of the hanging basket truss 17 through the rear anchor 27, so as to form a pull anchoring system and a lower anchoring system;

[0057] S33, installation of suspension system: anchor the upper end of the rear sling 28 to the connector 23 of the basket truss 17, anchor the upper end of the front sling 29 to the front upper cross beam 30 of the basket truss 17, anchor the lower parts of the rear sling 28 and the front sling 29 to the two ends of the front lower cross beam 31 respectively, and fix the front lower cross beam 31 to the lower side of the concrete box beam 16, so that the front lower cross beam 31 constitutes the bearing frame at the bottom of the basket truss 17;

[0058] S34, installation of prestressing system: embed anchor frame 34 in concrete box beam 16, connect embedded anchor frame 34 with reaction frame 33 through connecting column 35, fix bottom beam 37 of reaction frame 33 on embedded anchor frame 34, set anti-pressure steel plate 38 on top of bottom beam 37, pass tie bar 36 through connecting column 35 and anchor top of tie bar 36 with anti-pressure steel plate 38; install down-pressure jack 40 on cantilever side of reaction frame 33, and install up-pressure jack 32 between top of front sling 29 and front upper cross beam 30;

[0059] S35, applying a preload to the hanging basket: the downward pressure jack 40 provides downward pressure to act on the counter-pressure balance beam 39 at the front lower cross beam 31, and then the counter-pressure balance beam 39 acts on the front lower cross beam 31 to achieve preload, and the upward pressure jack 32 on the upper part of the front sling 29 is used to adjust the stress state of the hanging basket truss 17 during the preload process;

[0060] S36, after pre-stressing is completed, the formwork 15 is installed using the hanging basket truss 17 to perform the hanging pouring of the large cantilever flange single-box single-chamber cast-in-place box beam;

[0061] S37. After the casting and curing of the segmental box girder is completed, the connection of the pulling anchor system is maintained, and the connection of the lower anchor system is released, so that the hanging basket truss 17 is moved forward to the designated position for the hanging casting construction of the next segmental large cantilever flange single-box single-chamber cast-in-place box girder.

[0062] The construction steps for the transformation of the hanging basket and the hoisting of the large-span steel-concrete composite beam 41 and the steel box beam section are as follows:

[0063] S41, after the concrete box beam 16 is poured, the hanging basket truss 17 is transformed into a hanging basket transformation hoist 51 for lifting and hoisting a large-span box beam;

[0064] S42, installing a lifting jack 42 on the top of the sling 51 to provide vertical lifting force; installing a transverse jack 43 between the upper part of the front upper cross beam 30 and the lifting jack 42, so as to move the lifting jack 42 transversely, driving the lifting rod 44 and the steel-concrete combined section beam 41 to adjust their positions transversely;

[0065] S43, connect the upper part of the lifting rod 44 to the lifting jack 42, and the lower part to the positioning frame 49, install the connecting ear plate 50 on the positioning frame 49 through the connecting bolt 48, and install the hanging device 51 on the connecting ear plate 50 as a connecting node, so that the hanging device 51 is directly connected to the lifting ring 52 on the top of the steel-concrete combined section beam 41;

[0066] S44, install the lifting sleeve 45 on the positioning frame 49, make the lifting rod 44 pass through the lifting sleeve 45, install the adjusting diagonal rod 47 between the connecting shaft 46 at the corresponding position of the positioning frame 49 on both sides of the lifting sleeve 45, and adjust the balance of the positioning frame 49 by using the adjustable length characteristic of the adjusting diagonal rod 47;

[0067] Among them, the adjusting diagonal rod 47 includes an outer tube and an inner tube, and the outer tube and the inner tube are threadedly matched. The interior of the outer tube and the inner tube are respectively rotatably connected to the lifting sleeve 45 and the connecting shaft 46 at the positioning frame 49, so that the outer tube and the inner tube can rotate relative to each other, and the total length of the adjusting diagonal rod 47 can be changed.

[0068] S45. Using the modified hoist 51, the steel-concrete composite section beam 41 is lifted by the lifting jack 42, and the transverse positioning is performed by the transverse displacement jack 43, so as to achieve the lifting, transverse displacement and accurate lifting into place of the long-span box beam (steel-concrete composite section beam 41 and steel box beam section).

[0069] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system is characterized in that: The following steps are involved: Step 1: Pre-construction preparation; Step 2: Construction of 0# box beam (2); Step 3: Cast-in-place box girder with large cantilever flange and single box and single chamber; Step 4: Transformation of the hanging basket and hoisting of the large-span steel-concrete composite beam (41) and the steel box beam; The first step comprises: before the pier column (1) is cast, a plurality of embedded screws (3) are installed in the pier column (1), and anchor hook bars (4) are connected to the embedded screws (3); an embedded steel plate (5) is connected to the embedded screws (3), and is pre-embedded in the pier column (1), so that both ends of the embedded screws (3) extend out of the pier column (1), thereby providing a basis for the connection of the steel boot corbel (7).

2. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 1 is characterized in that: Step 2 includes: S21, after the construction of the pier column (1) is completed, the embedded screw rod (3) is passed through the steel boot bracket (7), the steel boot bracket (7) is connected to the embedded steel plate (5) of the pier column (1), and a gasket (6) is arranged at the anchoring end of the embedded screw rod (3); S22, installing the bracket upright support (8) and the bracket diagonal support (9), so that the ends thereof are respectively connected to the steel boot bracket (7), wherein the bracket upright support (8) is vertically arranged on the side of the pier column (1), so that the bracket upright support (8) and the bracket diagonal support (9) support the main beam (10); S23, sequentially install the distribution beam (11), truss (12), and corrugated beam (13) on the main beam (10), so that the corrugated beam (13) supports the bottom of the template (15), and simultaneously uses the bracket (14) to support the side of the template (15), thereby completing the support system of the 0# block template (15).

3. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 2 is characterized in that: Step 2 also includes, S24, using the constructed steel boot corbel (7) and formwork (15) to perform casting construction of the 0# box beam (2).

4. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 1 is characterized in that: Step three includes, S31, installing the hanging basket truss (17), and sequentially constructing the rear anchoring system, the suspension system and the preloading system; S32, installation of the rear anchoring system: an anchoring piece (18) is reserved in the concrete box girder (16) at the rear side of the hanging basket truss (17), and the anchoring end plate (19) at the bottom end of the tie rod (20) is connected to the anchoring piece (18), and the top of the tie rod (20) is connected to the tie rope (22) through a threaded sleeve (21), and the end of the tie rope (22) away from the threaded sleeve (21) is connected to the connector (23) at the rear end of the hanging basket truss (17); an embedded support frame (24) is reserved in the concrete box girder (16) at the bottom of the rear end of the hanging basket truss (17), and the top of the embedded support frame (24) is connected to the fixing frame (26) through an adapter (25), and the fixing frame (26) is connected to the connector (23) at the rear end of the hanging basket truss (17) through a rear anchoring piece (27), so as to form a pulling anchoring system and a lower anchoring system; S33, installation of the suspension system: anchoring the upper end of the rear sling (28) to the connector (23) of the basket truss (17), anchoring the upper end of the front sling (29) to the front upper cross beam (30) of the basket truss (17), anchoring the lower parts of the rear sling (28) and the front sling (29) to the two ends of the front lower cross beam (31), respectively, and fixing the front lower cross beam (31) to the lower side of the concrete box beam (16), so that the front lower cross beam (31) constitutes a bearing frame at the bottom of the basket truss (17); S34, installation of prestressing system: an anchor frame (34) is embedded in the concrete box girder (16), and the embedded anchor frame (34) is connected to the reaction frame (33) through a connecting column (35); a bottom beam (37) of the reaction frame (33) is fixed to the embedded anchor frame (34), a counter-pressure steel plate (38) is arranged on the upper part of the bottom beam (37), a tie bar (36) is passed through the connecting column (35) and the top of the tie bar (36) is anchored to the counter-pressure steel plate (38); a downward pressure jack (40) is installed on the cantilever side of the reaction frame (33), and an upward pressure jack (32) is installed between the upper part of the front sling (29) and the front upper cross beam (30).

5. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 4 is characterized in that: Step three also includes, S35, applying a preload to the hanging basket: providing downward pressure through a downward pressure jack (40) to act on a counter-pressure balance beam (39) at the front lower cross beam (31), and then acting on the front lower cross beam (31) through the counter-pressure balance beam (39) to achieve preload, and using the upward pressure jack (32) on the upper part of the front sling (29) to adjust the stress state of the hanging basket truss (17) during the preload process; S36, after the pre-stressing is completed, the formwork (15) is installed by using the hanging basket truss (17) to carry out the hanging pouring of the single-box single-chamber cast-in-place box beam with a large cantilever flange; S37, after the casting and curing of the segmental box girder is completed, the hanging basket truss (17) is moved forward to the designated position to carry out the hanging casting construction of the next segmental large cantilever flange single box single chamber cast-in-place box girder.

6. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 1 is characterized in that: Step 4 includes: S41, after the concrete box girder (16) is poured, the hanging basket truss (17) is transformed into a hoist (51) for lifting and hoisting a large-span box girder; S42, installing a lifting jack (42) on the top of the sling (51) to provide a vertical lifting force; installing a transverse jack (43) between the upper part of the front upper cross beam (30) and the lifting jack (42) to move the lifting jack (42) transversely and drive the lifting rod (44) and the steel-concrete combined section beam (41) to adjust their positions transversely; S43, connecting the upper part of the lifting rod (44) to the lifting jack (42), and the lower part to the positioning frame (49), installing the connecting ear plate (50) on the positioning frame (49) through the connecting bolt (48), installing the sling (51) using the connecting ear plate (50) as a connecting node, and connecting the sling (51) to the lifting ring (52) at the top of the steel-concrete combined section beam (41); S44, a lifting sleeve (45) is installed on the positioning frame (49), and the lifting rod (44) passes through the lifting sleeve (45), and an adjusting diagonal rod (47) is installed between the connecting shaft (46) at the corresponding position of the positioning frame (49) on both sides of the lifting sleeve (45), and the balance of the positioning frame (49) is adjusted by using the adjusting diagonal rod (47).

7. The construction method of the large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspended casting system according to claim 6 is characterized in that: Step 4 also includes, S45, using the modified lifting device (51), lifting the steel-concrete combined section beam (41) by means of a lifting jack (42), and performing lateral positioning by means of a transverse jack (43).

8. A large cantilever flange single-box single-chamber cast-in-place box beam hanging basket suspension casting system, characterized in that: It is obtained by the construction method of the large cantilever flange single-box single-chamber cast-in-place box girder hanging basket suspended casting system according to any one of claims 1-7.

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