Stripping type closure hanging bracket structure

Abstract

The utility model discloses a spanning type closure hanging bracket structure, and belongs to the technical field of bridge construction. The hanging bracket structure comprises a side pier body, a segment box girder and a hanging bracket, a supporting mechanism, a side span cast-in-place section and an approach bridge box girder are arranged on the side pier body, the supporting mechanism is used for supporting the side span cast-in-place section, a side span post-cast strip is reserved between the side span cast-in-place section and the approach bridge box girder, a closure section is arranged between the segment box girder and the side span cast-in-place section, and the hanging bracket is arranged on the side span post-cast strip. The upper portion of the hanging bracket is arranged on the approach bridge box girder and the segmental box girder, the lower portion of the hanging bracket is connected with the bottom of the segmental box girder, and the hanging bracket strides across the side span cast-in-place section and the closure section in the bridge direction and is used for supporting the closure section. The hanging bracket is only used for bearing the weight of the closure section, so that the weight of the hanging bracket is reduced. The lower portion of the hanging bracket is connected with the bottom of the segmental box girder, part of the weight of the hanging bracket and the closure section is shared through the bottom of the segmental box girder, stress on the hanging bracket is prevented from being excessively concentrated, and the use safety of the hanging bracket is improved.

Description

Technical Field

[0001] This utility model relates to a spanning closure suspension structure, belonging to the field of bridge construction technology. Background Technology

[0002] Currently, the supports for the cast-in-place side spans and closure sections mostly use ground-mounted supports or brackets. Due to site limitations such as mountainous areas, the auxiliary piers for the side spans are often high piers. If the length of the cast-in-place side span is too long, ordinary ground-mounted supports and brackets cannot be implemented. When the auxiliary piers of the side span are high, implementing ground-mounted supports is uneconomical or the conditions for implementing ground-mounted supports are not available; or if the length of the cast-in-place side span is too long, if brackets are used for the cast-in-place section, the bottom of the brackets needs to be supported on the pier, which may affect the construction quality of the pier due to eccentric compression or cause structural damage to the existing pier.

[0003] To address this, Chinese patent document CN216238129U discloses an integrated construction scaffold for the cast-in-place and closure sections of a continuous rigid frame bridge. This scaffold relies on standard Bailey bridges supported on the cantilever section and the transition pier cap beam as the main load-bearing structure. A suspension structure is formed using precision-rolled threaded steel and double-layered channel steel. A mortar leveling layer and transverse support beams are constructed on the cantilever section. Longitudinal support beams are installed on top of the transition pier cap beam, and double-layered Bailey bridges are placed on the longitudinal support beams. Standard Bailey bridges are installed on the transverse support beams and the double-layered Bailey bridges. The double-layered channel steel load-bearing beams serve as the longitudinal distribution beams, transverse distribution beams, wing plate support trusses, steel panels, and the load-bearing structure for the cast-in-place and closure sections of the side spans. They are anchored to the standard Bailey bridges using precision-rolled threaded steel, washers, and nuts. This method effectively improves the construction efficiency of the cast-in-place and closure sections of the side spans of a continuous rigid frame bridge, saves construction costs, and reduces construction safety risks.

[0004] However, the hanger is too bulky to support the weight of the cast-in-place section and the closure section of the side span, and the stress on the hanger is too concentrated, which reduces its safety. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a straddle-type closure hanger structure.

[0006] This utility model is achieved through the following technical solution:

[0007] A spanning closure suspension structure includes a side pier body, a segmental box girder, and a suspension frame. The side pier body is provided with a support mechanism, a side span cast-in-place section, and an approach bridge box girder. The support mechanism is used to support the side span cast-in-place section. A side span post-cast strip is left between the side span cast-in-place section and the approach bridge box girder. A closure section is provided between the segmental box girder and the side span cast-in-place section. The upper part of the suspension frame is located on the approach bridge box girder and the segmental box girder, and the lower part is connected to the bottom of the segmental box girder. The suspension frame spans the side span cast-in-place section and the closure section along the longitudinal direction of the bridge and is used to support the closure section.

[0008] The hanger includes a load-bearing component, a hanging basket bottom formwork component, and two outer formwork components. The load-bearing component is located on the upper side of the approach bridge box girder and the segmental box girder. One end of the load-bearing component is mounted on the approach bridge box girder via a continuous pad beam, and the other end is mounted on the segmental box girder via a continuous pad beam. The hanging basket bottom formwork component is located on the lower side of the segmental box girder and the closure section. One end of the load-bearing component is connected to the load-bearing component via several suspension components A, and the other end is connected to the bottom plate of the segmental box girder via several suspension components A. The two outer formwork components are symmetrically arranged on both sides of the closure section and are located between the load-bearing component and the hanging basket bottom formwork component. The two outer formwork components are respectively connected to the load-bearing component via several suspension components B.

[0009] The load-bearing component includes multiple Bailey beams arranged side by side, with the Bailey beams arranged longitudinally along the segmental box girder.

[0010] The Bailey beams are double-section Bailey beams, and all Bailey beams are connected together by multiple transverse trusses and multiple diagonal trusses.

[0011] The hanging basket bottom template assembly includes a bottom template and two parallel bottom basket crossbeams. Multiple bottom basket longitudinal beams are arranged in parallel at the bottom of the bottom template. The two bottom basket crossbeams are located at the bottom of the bottom basket longitudinal beams, arranged in a crisscross pattern with the bottom basket longitudinal beams, and connected to all the bottom basket longitudinal beams.

[0012] One of the bottom basket crossbeams is connected to the load-bearing component through multiple suspension components A, and the other bottom basket crossbeam is connected to the bottom plate of the segmental box girder through multiple suspension components A.

[0013] The bottom basket crossbeam is equipped with a protective railing.

[0014] The suspension assembly A includes a suspension rod and a lower distribution beam and two upper distribution beams that pass through the suspension rod. The lower distribution beam is located on the lower side of the bottom basket crossbeam, and a precision-locked nut is threaded onto the lower distribution beam on the suspension rod. The two upper distribution beams are located on the upper side of the segmental box girder bottom plate or the load-bearing assembly, and two jacks are provided between the two upper distribution beams. Precision-locked nuts are threaded onto the upper side of the two upper distribution beams on the suspension rod.

[0015] The outer template assembly includes a flower stand and an outer template set on the flower stand. The bottom of the flower stand is provided with an outer template longitudinal distribution beam and an outer sliding beam, and the outer template longitudinal distribution beam and the outer sliding beam are respectively connected to the load-bearing assembly through several suspension components B.

[0016] The suspension assembly B includes a boom and two upper distribution beams that pass through the boom. The lower end of the boom is threaded with a precision-locked nut. Both upper distribution beams are located on the upper side of the load-bearing assembly, and two jacks are provided between the two upper distribution beams. The boom is threaded with precision-locked nuts on the upper side of the two upper distribution beams respectively.

[0017] The lifting rod is a 40Cr lead screw.

[0018] A construction method for a straddle-type closure suspension structure includes the following steps:

[0019] Step 1: Use locking mechanisms to lock the approach bridge box girder to the side pier and abutment respectively, so that the approach bridge box girder, side pier and abutment are fixed in the longitudinal direction of the bridge.

[0020] Step 2: Build a support structure on the side pier, and erect formwork on the support structure to pour concrete for the side span cast-in-place section. At the same time, reserve a side span post-cast strip between the side span cast-in-place section and the approach bridge box girder.

[0021] Step 3: After the concrete of the side span cast-in-place section has solidified to the design strength, the prestressed system conversion of the side span cast-in-place section is completed using the operating space left by the side span post-cast strip.

[0022] Step 4: Reserve the installation hole of the suspension component A on the bottom plate of the segment box girder near the closure section, then move the hanging basket forward, and anchor the bottom basket crossbeam of the hanging basket bottom template assembly near the segment box girder to the bottom plate of the segment box girder through the suspension component A;

[0023] Step 5: Lay continuous pad beams on the segmental box girder and approach bridge box girder respectively, and hoist the load-bearing components onto the continuous pad beams. Then, anchor the bottom basket crossbeam of the hanging basket bottom formwork assembly near the side span cast-in-place section to the load-bearing components through the suspension component A.

[0024] Step 6: Hoist the outer formwork assembly and anchor it to the load-bearing assembly via suspension assembly B. Then move the main truss of the hanging basket to the No. 0 box girder segment of the main bridge.

[0025] Step 7: Use jacks to adjust the bottom formwork assembly and the outer formwork assembly of the hanging basket to the design elevation respectively;

[0026] Step 8: Pour the closure section concrete. After the concrete has solidified to the design strength, use the operating space left by the side span post-pouring strip to complete the prestressed system conversion of the closure section, and then pour the side span post-pouring strip concrete.

[0027] Step 9: Move the main truss of the hanging basket to the closure section, and change the anchorage of suspension components A and B from being anchored to the load-bearing components and the bottom plate of the segment box girder to being anchored to the main truss of the hanging basket;

[0028] Step 10: Remove the load-bearing components and outer formwork components, move the hanging basket forward to the side span cast-in-place section, and use a winch to suspend the bottom formwork components of the hanging basket until the bottom formwork components of the hanging basket are lowered to the ground. Then, remove the locking mechanism, support mechanism and main truss of the hanging basket in sequence.

[0029] The beneficial effects of this utility model are as follows:

[0030] 1. The cast-in-place section of the side span is supported by a support structure, and the closure section is supported by hangers. Since the hangers are only used to bear the weight of the closure section, their weight is reduced. The upper part of the hangers is located on the approach bridge box girder and segmental box girder, while the lower part is connected to the bottom of the segmental box girder. The bottom of the segmental box girder bears part of the weight of the hangers and the closure section, avoiding excessive stress concentration on the hangers and improving the safety of the hangers in use.

[0031] 2. Assemble the bottom formwork, bottom basket longitudinal beams, and bottom basket transverse beams to form the hanging basket bottom formwork assembly. This allows the hanging basket bottom formwork assembly to be suspended using the main truss of the hanging basket, and enables the hanging basket bottom formwork assembly to move rapidly along the bridge direction. This helps to improve the construction efficiency of the bridge and shorten the bridge construction period.

[0032] 3. During the concrete pouring process of the side span cast-in-place section, the top of the side pier is subjected to eccentric force by the concrete of the side span cast-in-place section, which generates a counterclockwise bending moment on the bottom of the side pier. However, since the top of the side pier, the approach bridge box girder and the abutment are fixedly connected as one unit in the longitudinal direction of the bridge, the horizontal reaction force provided by the abutment and the approach bridge box girder will generate a bending moment in the opposite direction to that of the side span cast-in-place section at the bottom of the side pier. This opposite bending moment has a balancing effect on the eccentric pouring bending moment of the side span cast-in-place section, reducing the risk of structural damage caused by eccentric compression of the side pier.

[0033] 4. Constructing the approach bridge box girder first, followed by the cast-in-place side spans and the closure section, allows for simultaneous construction of the main bridge and approach bridges, thereby improving bridge construction efficiency.

[0034] 5. The cast-in-place section and the post-cast strip of the side span press on the left side of the top of the side pier, causing a counterclockwise bending moment at the bottom of the side pier. Meanwhile, the load-bearing components and the approach bridge box girder press on the right side of the top of the side pier. Therefore, during the concrete pouring of the closure section, the closure section concrete, the hangers, and the approach bridge box girder cause a clockwise bending moment at the bottom of the side pier. This clockwise bending moment balances the aforementioned counterclockwise bending moment, further reducing the risk of structural damage caused by eccentric compression of the side pier. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this utility model;

[0036] Figure 2 for Figure 1 Sectional view along AA;

[0037] Figure 3 for Figure 1 A cross-sectional view along BB;

[0038] Figure 4 for Figure 1 Sectional view along CC;

[0039] Figure 5 for Figure 4 A schematic diagram of the structure after the support mechanism has been removed.

[0040] In the diagram: 1- Closure section, 2-Continuous pad beam, 3-Side span cast-in-place section, 4-Approach bridge box girder, 5-Bailey beam, 6-Upper distribution beam, 7-Jack, 8-Hanging rod, 9-Precision binding nut, 10-Outer formwork, 11-Blossom stand, 12-Bottom basket crossbeam, 13-Outer formwork longitudinal distribution beam, 14-Outer sliding beam, 15-Bottom basket longitudinal beam, 16-Bottom formwork, 17-Lower distribution beam, 18-Crossbeam guardrail, 19-Segmental box girder, 20-Side pier body, 21-Supporting mechanism, 22-Hanging frame, 23-Side span post-cast strip. Detailed Implementation

[0041] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0042] like Figures 1 to 5 As shown, the present invention discloses a cross-span closure suspension structure, comprising a side pier body 20, a segmental box girder 19, and a suspension 22. The side pier body 20 is equipped with a support mechanism 21, a side span cast-in-place section 3, and an approach bridge box girder 4. The support mechanism 21 supports the side span cast-in-place section 3. A side span post-cast strip 23 is provided between the side span cast-in-place section 3 and the approach bridge box girder 4. A closure section 1 is provided between the segmental box girder 19 and the side span cast-in-place section 3. The upper part of the suspension 22 is located on the approach bridge box girder 4 and the segmental box girder 19, and the lower part is connected to the bottom of the segmental box girder 19. The suspension 22 spans along the longitudinal direction of the bridge across the side span cast-in-place section 3 and the closure section 1, and is used to support the closure section 1. In use, the side span cast-in-place section 3 is supported by the support mechanism 21, and the closure section 1 is supported by the suspension 22. Since the suspension 22 is only used to bear the weight of the closure section 1, the weight of the suspension 22 is reduced. The upper part of the hanger 22 is located on the approach bridge box girder 4 and the segment box girder 19, while the lower part is connected to the bottom of the segment box girder 19. The bottom of the segment box girder 19 bears part of the weight of the hanger 22 and the closure section 1, which avoids the hanger 22 being subjected to excessive force concentration and improves the safety of the hanger 22.

[0043] The structure of the support mechanism 21 is consistent with the structure of the support mechanism in the patent document with publication number CN115652823A, which is prior art and will not be described in detail here.

[0044] The hanger 22 includes a load-bearing component, a hanging basket bottom formwork component, and two outer formwork components. The load-bearing component is located on the upper side of the approach bridge box girder 4 and the segmental box girder 19. One end of the load-bearing component is mounted on the approach bridge box girder 4 via a continuous pad beam 2, and the other end is mounted on the segmental box girder 19 via a continuous pad beam 2. The hanging basket bottom formwork component is located on the lower side of the segmental box girder 19 and the closure section 1. One end of the load-bearing component is connected to the load-bearing component via multiple suspension components A, and the other end is connected to the bottom plate of the segmental box girder 19 via multiple suspension components A. The two outer formwork components are symmetrically arranged on both sides of the closure section 1, and are both located between the load-bearing component and the hanging basket bottom formwork component. The two outer formwork components are respectively connected to the load-bearing component via multiple suspension components B. In use, the continuous pad beam 2 is made of double-splittered 22a I-beams.

[0045] The load-bearing component includes multiple Bailey beams 5 arranged side by side, and the Bailey beams 5 are arranged longitudinally along the segmental box girder 19.

[0046] The Bailey beam 5 is a double-section Bailey beam, with all Bailey beams 5 connected together by multiple transverse trusses and multiple diagonal trusses. In use, the Bailey beam 5 is a 150mm type. Connecting all Bailey beams 5 together through multiple transverse trusses and multiple diagonal trusses improves the overall integrity, stability, strength, and stiffness of the load-bearing components.

[0047] The hanging basket bottom template assembly includes a bottom template 16 and two side-by-side bottom basket crossbeams 12. Multiple bottom basket longitudinal beams 15 are arranged side-by-side at the bottom of the bottom template 16. The two bottom basket crossbeams 12 are located at the bottom of the bottom basket longitudinal beams 15, are arranged in a crisscross pattern with the bottom basket longitudinal beams 15, and are connected to all the bottom basket longitudinal beams 15.

[0048] One of the bottom basket crossbeams 12 is connected to the load-bearing component through multiple suspension components A, and the other bottom basket crossbeam 12 is connected to the bottom plate of the segmental box girder 19 through multiple suspension components A;

[0049] The bottom basket crossbeam 12 is equipped with a protective railing 18. In use, the bottom basket longitudinal beam 15 is made of 40A I-beams, the bottom basket crossbeam 12 is made of double-layered 45A I-beams, the bottom formwork 16 is made of 5mm steel plate, and the protective railing 18 is made of No. 10 channel steel. Assembling the bottom formwork 16, bottom basket longitudinal beam 15, and bottom basket crossbeam 12 forms the hanging basket bottom formwork assembly. This allows for the suspension of the hanging basket bottom formwork assembly using the main truss of the hanging basket, and enables rapid movement of the hanging basket bottom formwork assembly along the bridge direction. This helps improve bridge construction efficiency and shorten the bridge construction period.

[0050] The suspension assembly A includes a suspension rod 8 and a lower distribution beam 17 and two upper distribution beams 6 passing through the suspension rod 8. The lower distribution beam 17 is located below the bottom basket crossbeam 12, and a precision-locked nut 9 is threaded onto the lower distribution beam 17 on the suspension rod 8. The two upper distribution beams 6 are located above the bottom plate of the segmental box girder 19 or the load-bearing assembly, and two jacks 7 are provided between the two upper distribution beams 6. Precision-locked nuts 9 are threaded onto the upper sides of the two upper distribution beams 6 on the suspension rod 8. In use, the upper distribution beams 6 are made of double-layered 18a channel steel, the lower distribution beams 17 are made of double-layered 20a channel steel, and the jacks 7 are mechanical jacks.

[0051] The outer template assembly includes a flower stand 11 and an outer template 10 mounted on the flower stand 11. The bottom of the flower stand 11 is provided with an outer template longitudinal distribution beam 13 and an outer sliding beam 14, which are connected to the load-bearing assembly via multiple suspension components B. In use, the outer template 10 is made of 5mm steel plate.

[0052] The suspension assembly B includes a suspension rod 8 and two upper distribution beams 6 passing through the suspension rod 8. The lower end of the suspension rod 8 is threaded with a precision-locked nut 9. Both upper distribution beams 6 are located on the upper side of the load-bearing assembly, and two jacks 7 are provided between the two upper distribution beams 6. The suspension rod 8 is threaded with precision-locked nuts 9 on the upper side of the two upper distribution beams 6 respectively.

[0053] The lifting rod 8 is a 40Cr threaded rod. Unlike existing precision-rolled threaded steel, which is hard and brittle with poor toughness, weak impact resistance, and poor weldability, the 40Cr threaded rod exhibits superior overall mechanical properties, significantly extending the service life of the lifting rod 8.

[0054] A construction method for a straddle-type closure suspension structure includes the following steps:

[0055] Step 1: Use locking mechanisms to lock the approach bridge box girder 4 to the side pier body 20 and the abutment, thus fixing the approach bridge box girder 4, side pier body 20 and abutment in the longitudinal direction of the bridge. The structure of the locking mechanism and the method for fixing the approach bridge box girder 4, side pier body 20 and abutment in the longitudinal direction are consistent with the locking mechanism structure and related methods in patent document CN115652823A, and are existing technology, so they will not be described again here.

[0056] During the concrete pouring of the side span cast-in-place section 3, the top of the side pier body 20 is subjected to eccentric force by the concrete of the side span cast-in-place section 3, which generates a counterclockwise bending moment on the bottom of the side pier body 20. However, since the top of the side pier body 20, the approach bridge box girder 4, and the abutment are fixedly connected as one unit in the longitudinal direction of the bridge, the horizontal reaction force provided by the abutment and the approach bridge box girder 4 will generate a bending moment in the opposite direction to that of the side span cast-in-place section 3 at the bottom of the side pier body 20. This opposite bending moment has a balancing effect on the eccentric pouring bending moment of the side span cast-in-place section 3, reducing the risk of structural damage caused by the eccentric compression of the side pier body 20.

[0057] Step 2: Construct a support structure 21 on the pier body 20, and erect formwork on the support structure 21 to pour concrete for the side span cast-in-place section 3. Simultaneously, reserve a post-cast strip 23 between the side span cast-in-place section 3 and the approach bridge box girder 4. This invention constructs the approach bridge box girder 4 first, then the side span cast-in-place section 3 and the closure section 1. This construction sequence allows for simultaneous construction of the main bridge and approach bridges, improving bridge construction efficiency. However, the existing technology with publication number CN216238129U constructs the side span cast-in-place section and the side span closure section first, then the approach bridge box girder 4. The approach bridge box girder 4 can only be constructed after the main bridge construction is completed, significantly reducing bridge construction efficiency.

[0058] Step 3: After the concrete of the side span cast-in-place section 3 has solidified to the design strength, the prestressed system conversion of the side span cast-in-place section 3 is completed using the operating space left by the side span post-cast strip 23.

[0059] Step 4: Reserve the installation hole of the suspension component A on the bottom plate of the segment box girder 19 near the closure section 1, then move the hanging basket forward, and anchor the bottom basket crossbeam 12 of the hanging basket bottom template assembly near the segment box girder 19 to the bottom plate of the segment box girder 19 through the suspension component A.

[0060] Step 5: Lay continuous pad beams 2 on the segmental box girder 19 and the approach bridge box girder 4 respectively, and hoist the load-bearing components onto the continuous pad beams 2. Then, anchor the bottom basket crossbeam 12 of the hanging basket bottom formwork assembly near the side span cast-in-place section 3 to the load-bearing components through the suspension component A.

[0061] Step 6: Hoist the outer formwork assembly and anchor it to the load-bearing assembly via suspension assembly B. Then move the main truss of the hanging basket to the No. 0 box girder segment of the main bridge.

[0062] Step 7: Use jack 7 to adjust the bottom formwork assembly and the outer formwork assembly of the hanging basket to the design elevation.

[0063] Step 8: Pour concrete for closure section 1. After the concrete has solidified to the design strength, use the operating space left by the side span post-pouring strip 23 to complete the prestressed system conversion of closure section 1, and then pour concrete for side span post-pouring strip 23.

[0064] like Figure 4 As shown, the cast-in-place section 3 and the post-cast strip 23 of the side span press on the left side of the top of the side pier body 20, causing a counterclockwise bending moment at the bottom of the side pier body 20; while the load-bearing components and the approach bridge box girder 4 press on the right side of the top of the side pier body 20. Therefore, during the concrete pouring of the closure section 1, the concrete of the closure section 1, the hanger 22 and the approach bridge box girder 4 cause a clockwise bending moment at the bottom of the side pier body 20. This clockwise bending moment has a balancing effect on the aforementioned counterclockwise bending moment, further reducing the risk of structural damage caused by eccentric compression of the side pier body 20.

[0065] Step 9: Move the main truss of the hanging basket to the closure section 1, and change the anchorage of suspension components A and B from being anchored to the load-bearing components and the bottom plate of segment box girder 19 to being anchored to the main truss of the hanging basket.

[0066] Step 10: Remove the load-bearing components and outer formwork components, move the hanging basket forward to the 3rd position of the side span cast-in-place section, and use a winch to suspend the bottom formwork components of the hanging basket until the bottom formwork components of the hanging basket are lowered to the ground. Then, remove the locking mechanism, support mechanism 21 and the main truss of the hanging basket in sequence.

[0067] The main truss and hanger 22 of the hanging basket can be assembled or disassembled as needed, which improves the construction efficiency of the closure section 1 through the main truss of the hanging basket.

Claims

1. A cross-over closure gantry structure, characterized by: The side pier pier body (20) is provided with a support mechanism (21), a side span cast-in-place section (3) and a approach box girder (4), the support mechanism (21) is used for supporting the side span cast-in-place section (3), a side span post-cast strip (23) is arranged between the side span cast-in-place section (3) and the approach box girder (4), a closure section (1) is arranged between the segmental box girder (19) and the side span cast-in-place section (3), the upper portion of the hanging bracket (22) is arranged on the approach box girder (4) and the segmental box girder (19), and the lower portion is connected with the bottom of the segmental box girder (19); the hanging bracket (22) crosses the side span cast-in-place section (3) and the closure section (1) along the bridge direction and is used for supporting the closure section (1).

2. The crossover closure gantry structure of claim 1, wherein: The hanging bracket (22) comprises a bearing assembly, a hanging basket bottom formwork assembly and two outer side formwork assemblies; the bearing assembly is arranged on the upper side of the approach box girder (4) and the segmental box girder (19), one end of the bearing assembly is arranged on the approach box girder (4) through a full-length cushion beam (2), and the other end of the bearing assembly is arranged on the segmental box girder (19) through the full-length cushion beam (2); the hanging basket bottom formwork assembly is arranged on the lower side of the segmental box girder (19) and the closure section (1), one end of the hanging basket bottom formwork assembly is connected with the bearing assembly through a plurality of suspension assemblies A, and the other end of the hanging basket bottom formwork assembly is connected with the bottom plate of the segmental box girder (19) through a plurality of suspension assemblies A; the two outer side formwork assemblies are symmetrically arranged on the two sides of the closure section (1) and are arranged between the bearing assembly and the hanging basket bottom formwork assembly; the two outer side formwork assemblies are respectively connected with the bearing assembly through a plurality of suspension assemblies B.

3. The crossover closure gantry structure of claim 2, wherein: The bearing assembly comprises a plurality of side-by-side arranged Bailey beams (5), and the Bailey beams (5) are arranged along the longitudinal direction of the segmental box girder (19).

4. The crossover closure gantry structure of claim 3, wherein: The Bailey beams (5) are double-spliced Bailey beams, and all the Bailey beams (5) are connected together through a plurality of transverse trusses and a plurality of inclined trusses.

5. The crossover closure gantry structure of claim 2, wherein: The hanging basket bottom formwork assembly comprises a bottom formwork (16) and two side-by-side arranged bottom basket cross beams (12); the bottom of the bottom formwork (16) is provided with a plurality of bottom basket longitudinal beams (15) arranged side by side; the two bottom basket cross beams (12) are arranged on the bottom of the bottom basket longitudinal beams (15) and are arranged in a longitudinal and transverse interlaced manner and connected with all the bottom basket longitudinal beams (15); one of the two bottom basket cross beams (12) is connected with the bearing assembly through a plurality of suspension assemblies A, and the other bottom basket cross beam (12) is connected with the bottom plate of the segmental box girder (19) through a plurality of suspension assemblies A; The bottom basket cross beam (12) is provided with a cross beam guardrail (18).

6. The crossover closure gantry structure of claim 5, wherein: The suspension assembly A comprises a suspender (8), a lower distribution beam (17) and two upper distribution beams (6) arranged on the suspender (8); the lower distribution beam (17) is arranged on the lower side of the bottom basket cross beam (12), and a precision nut (9) is threadedly connected to the suspender (8) on the lower side of the lower distribution beam (17); the two upper distribution beams (6) are arranged on the upper side of the bottom plate of the segmental box girder (19) or the bearing assembly, and two jacks (7) are arranged between the two upper distribution beams (6); precision nuts (9) are threadedly connected to the suspender (8) on the upper sides of the two upper distribution beams (6).

7. The crossover closure gantry structure of claim 2, wherein: The outer side formwork assembly comprises a flower stand (11) and an outer side formwork (10) arranged on the flower stand (11), the bottom of the flower stand (11) is provided with an outer side formwork longitudinal distribution beam (13) and an outer sliding beam (14), and the outer side formwork longitudinal distribution beam (13) and the outer sliding beam (14) are connected with the bearing assembly through a plurality of suspension assemblies B respectively.

8. The crossover closure gantry structure of claim 2, wherein: The suspension assembly B comprises a suspender (8) and two upper distribution beams (6) arranged on the suspender (8), the lower end of the suspender (8) is threadedly connected with a fine nut (9), the two upper distribution beams (6) are located on the upper side of the bearing assembly, two jacks (7) are arranged between the two upper distribution beams (6), and the suspender (8) is threadedly connected with a fine nut (9) on the upper side of the two upper distribution beams (6) respectively.

9. The crossover closure gantry structure of claim 6 or 8, wherein: The suspender (8) is a 40Cr screw rod.

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