Simple-supported to continuous composite beam bridge structure for improving anti-cracking performance of bridge deck in negative bending moment zone

Abstract

The present application relates to a kind of simply supported to continuous combination beam bridge structure of lifting negative bending moment area bridge deck slab crack resistance, including two side abutments, several bridge piers between two side abutments are distributed along longitudinal bridge direction, the top of two side abutments and several bridge piers is equipped with combination beam structure, the combination beam structure includes several steel-concrete composite beams spliced along transverse bridge direction, the lower portion of combination beam structure is between abutment and bridge pier, between adjacent bridge pier is all equipped with the arch shape cable structure that is upward protruding, the protruding top of cable structure is anchored in the midspan of combination beam structure, the bottom of both ends of cable structure between abutment and bridge pier is respectively anchored on abutment and bridge pier, the bottom of both ends of cable structure between adjacent bridge pier is all anchored on bridge pier.The present application is simple in structure, reasonable in design, more low in cost, more simple and fast in construction, can prevent the cracking of negative bending moment concrete slab, improves the durability of structure.

Description

Technical fields: This invention relates to a simply supported to continuous composite beam bridge structure that improves the crack resistance of the bridge deck in the negative bending moment zone. Background technology: Steel-concrete composite continuous box girder bridges combine the tensile strength of steel with the compressive strength of concrete, offering significant economic and technological advantages over traditional steel box girder and prestressed concrete bridges. However, in the negative bending moment zone at the top of the middle piers of multi-span steel-concrete composite continuous girder bridges, the concrete bridge deck may experience tension. If the tensile stress exceeds the allowable tensile value of the concrete, cracks will occur in the concrete in the negative bending moment zone, reducing the structure's durability and affecting its service life.

[0003] Existing methods for addressing concrete cracking in the negative bending moment zone of steel-concrete composite continuous box girder bridges include: ① applying prestress within the concrete bridge deck in the negative bending moment zone. This method involves complex prestressing and anchoring, resulting in significant prestress loss. In the long term, the effective prestress is often applied to the steel beam, leaving very little effective prestress in the bridge deck of the negative bending moment zone; ② adjusting the relative elevation of the supports to create prestress. This method involves lifting the supports, which is technically complex and carries significant operational risks; ③ placing a temporary load in the positive bending moment zone of the composite beam, and then pouring the concrete in the negative bending moment zone under the condition of the steel beam being subjected to additional forces. This preloading method requires applying a temporary static load to the bridge deck, resulting in a large workload and poor economic efficiency.

[0004] In view of the above-mentioned defects or deficiencies in the existing technology, there is an urgent need for a crack prevention technology that is cheaper, simpler to construct, and faster to prevent cracking of negative moment concrete slabs and improve the durability of the structure. This case arises from this need. Summary of the Invention: The present invention addresses the problems existing in the prior art, namely, the technical problem to be solved by the present invention is to provide a simply supported to continuous composite beam bridge structure that improves the crack resistance of the bridge deck in the negative bending moment zone.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a simply supported to continuous composite beam bridge structure for improving the crack resistance of bridge deck in the negative bending moment zone, comprising abutments on both sides and several piers distributed between the abutments along the longitudinal direction of the bridge. A composite beam structure is provided between the tops of the abutments and the piers. The composite beam structure includes several steel-concrete composite beams spliced ​​along the transverse direction of the bridge. The lower part of the composite beam structure is provided with an upwardly protruding arch-shaped cable structure between the abutments and piers and between adjacent piers. The top of the protruding cable structure is anchored in the mid-span of the composite beam structure. The bottom ends of the cable structure located between the abutments and piers are anchored to the abutments and piers respectively. The bottom ends of the cable structure located between adjacent piers are anchored to the piers.

[0007] Furthermore, the number of spans of the cable structure is the same as the number of spans of the steel-concrete composite beam, and the cable structure consists of no less than two cables in the transverse direction.

[0008] Furthermore, the steel-concrete composite beam includes a concrete bridge deck and at least two steel beams spliced ​​along the longitudinal direction of the bridge. The concrete bridge deck is connected to the upper web of the steel beams via shear connectors.

[0009] Furthermore, each cable is connected to the concrete bridge deck of the steel-concrete composite beam by multiple tie rods spaced apart along the longitudinal direction of the bridge.

[0010] Furthermore, the upper end of the tie rod is provided with a reserved hole, and a pull ring is inserted into the reserved hole. The pull ring is connected to the pre-embedded anchor point on the bottom surface of the concrete bridge deck. The lower end of the tie rod is fixed with a cable clamp, which clamps the cable.

[0011] Furthermore, when the pier is located at the midpoint of the simply supported to continuous composite beam bridge structure, the pier body is provided with a first reserved cableway hole, and the cable structure passes through the first reserved cableway hole of the pier. The first reserved cableway hole is V-shaped, and the lower part of the first reserved cableway hole is a curved transition.

[0012] Furthermore, when the pier or abutment is located at the side support of a simply supported to continuous composite beam bridge structure, a second reserved cableway hole is provided on the pier body or abutment body. The second reserved cableway hole has a groove on the side of the pier or abutment, and an anchor is provided on the bottom surface of the groove. The plane of the anchor is perpendicular to the second reserved cableway hole.

[0013] Furthermore, the pre-embedded anchor point is a pre-embedded ring-shaped steel bar, which is set between two steel-concrete composite beams in the transverse direction of the bridge, and the pull ring is connected to the pre-embedded ring-shaped steel bar.

[0014] Furthermore, in the steel-concrete composite beam, adjacent steel beams are connected by welding, and the concrete bridge deck is provided with wet joints.

[0015] Another technical solution adopted in this invention is: a construction method for a simply supported to continuous composite beam bridge structure to improve the crack resistance of the bridge deck in the negative bending moment zone, comprising the following steps: Step S1, steel beam fabrication: The steel beam is divided into several segments, the length of which is the maximum of the single span of the composite beam bridge structure; then the steel beam is fabricated in segments in the factory and transported to the prefabrication site. Step S2, prefabrication of concrete bridge deck: Process the formwork for prefabricated concrete bridge deck, process the reinforcing bars and tie them inside the formwork, pour concrete inside the formwork, and cover and water-cur the concrete after it has set. When the concrete bridge deck reaches the required strength, the surface of the concrete bridge deck in the wet joint is manually roughened to create a rough surface. Step S3, Steel beam simple support installation: Transport the steel beam to the bridge site, install permanent supports on the piers and abutments, install temporary supports on both sides of the permanent supports, hoist the steel beam and simply support it on the temporary supports, and install the transverse connection system between the steel beams; Step S4, Transforming Simply Supported Steel Beams into Continuous Beams: Measure the gap between the two simply supported steel beams, process the steel beam connection section, install the steel beam connection section on the permanent support, and weld it to the simply supported steel beams at both ends. Remove the temporary support, and the composite beam structure transforms from simply supported to continuous. Step S5, installation of bridge deck at mid-span: Install the concrete bridge deck at mid-span of the mid-span and side spans of the composite beam bridge structure, tie the wet joint reinforcement between the concrete bridge decks, pre-embed the ring reinforcement of the pre-embedded anchor points, pour the wet joint concrete, and carry out concrete curing. Step S6, Cable Installation and Tensioning: Locate the cable clamps on the cable, pass the cable through the reserved cableway holes in the abutment or pier, install the cable clamps and tie rods on the cable, connect the tie rods to the pre-embedded ring steel bars on the concrete bridge deck through the tie rings, install the matching anchors and clamps at the ends of the cable, use the chain hoist on the hand-operated support to hoist the jacks, align them with the center of the cable clamp holes, then install the tool anchors, clamp the cable, and use the jacks to tension both ends of the cable, tensioning both ends of the cable as synchronously as possible; after confirming that the requirements are met, remove the tensioning equipment, and the cable tensioning is complete; Step S7, Cast-in-place construction of bridge deck in negative bending moment zone: Install bridge deck formwork in negative bending moment zone, tie bridge deck reinforcement, pour bridge deck concrete in negative bending moment zone, and carry out concrete curing. Step S8, cable tensioning and removal: After the concrete bridge deck in the negative bending moment zone reaches the specified strength, the cables are tensioned using jacks, and the cables are gradually tensioned and the cable structure is removed, so that the bridge deck in the negative bending moment zone generates a certain pre-stress. Then the reserved cableway holes in the piers and abutments are sealed. Step S9, Bridge deck paving and crash barrier construction: construct bridge deck paving, tie crash barrier reinforcement bars, install crash barrier formwork, pour crash barrier concrete and cure.

[0016] Compared with the prior art, the present invention has the following effects: The present invention connects the steel-concrete composite beam with an arch-shaped cable structure between the piers and between the piers and the abutments. The tensioning of the cable structure causes the steel-concrete composite beam to deflect downward at mid-span. After the concrete bridge deck in the negative bending moment zone of the steel-concrete composite beam reaches the specified value, the cable structure is released, which can generate pressure on the bridge deck in the negative bending moment zone, thereby improving the crack resistance of the bridge deck in the negative bending moment zone. The structure is simple, the design is reasonable, the cost is lower, and the construction is simpler and faster. It can prevent the cracking of the negative bending moment concrete slab and improve the durability of the structure. Attached image description: Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a cross-sectional schematic diagram of the composite beam structure in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the concrete bridge deck anchor point structure in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the longitudinal cable-stayed structure in Embodiment 1 of the present invention; Figure 5 This is a partially enlarged schematic diagram of Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the longitudinal cable-stayed structure in Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the longitudinal cable structure in Embodiment 3 of the present invention.

[0018] In the picture: 1-Abutment; 2-Pier; 3-Composite beam structure; 4-Steel-concrete composite beam; 5-Cable structure; 6-Cable; 7-Concrete bridge deck; 8-Steel beam; 9-Tie rod; 10-Tie ring; 11-Embedded anchor point; 12-Cable sleeve; 13-Negative bending moment zone; 14-Cable clamp; 15-Transverse connection system; 16-Anchorage. Detailed implementation method: The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] Example 1: As Figure 1As shown, the present invention discloses a simply supported to continuous composite beam bridge structure for improving the crack resistance of bridge deck in the negative bending moment zone. The structure includes two abutments 1 on both sides and several piers 2 distributed longitudinally between the two abutments 1. A composite beam structure 3 is provided between the tops of the two abutments 1 and the several piers 2. The composite beam structure 3 includes several steel-concrete composite beams 4 spliced ​​transversely. An upwardly protruding arched cable structure 5 is provided at the lower part of the composite beam structure 3 between the abutments 1 and the piers 2, and between adjacent piers 2. The top of the protruding cable structure 5 is anchored at the mid-span of the composite beam structure 3. The bottom ends of the cable structure 5 located between the abutments 1 and the piers 2 are respectively anchored to the abutments 1 and the piers 2. The bottom ends of the cable structure 5 located between adjacent piers 2 are both anchored to the piers 2. During construction, the tensioning of the cable structure causes the mid-span of the steel-concrete composite beam to deflect downwards. Then, the concrete bridge deck in the negative bending moment zone of the steel-concrete composite beam is constructed. Once the strength of the concrete bridge deck in the negative bending moment zone reaches the specified value, the cable structure is released, which generates pressure on the bridge deck in the negative bending moment zone, thereby improving the crack resistance of the bridge deck in the negative bending moment zone.

[0022] In this embodiment, the number of spans of the cable structure 5 is the same as the number of spans of the steel-concrete composite beam 4, and the cable structure 5 is composed of no less than 2 cables 6 in the transverse direction of the bridge.

[0023] In this embodiment, the steel-concrete composite beam 4 includes a concrete bridge deck 7 and at least two steel beams 8 spliced ​​along the longitudinal direction of the bridge. The concrete bridge deck 7 is connected to the upper web of the steel beams 8 via shear connectors. Furthermore, adjacent steel beams 8 are connected by welding, and the concrete bridge deck 7 is provided with wet joints.

[0024] In this embodiment, each cable 6 is connected to the concrete bridge deck 7 of the steel-concrete composite beam by multiple tie rods 9 spaced apart along the longitudinal direction of the bridge. Furthermore, the upper end of each tie rod 9 has a pre-drilled hole, through which a pull ring 10 passes, and the pull ring 10 is connected to a pre-embedded anchor point 11 on the bottom surface of the concrete bridge deck 7; the lower end of each tie rod 8 is fixed with a cable clamp 14, which holds the cable in place.

[0025] In this embodiment, when the pier 2 is located at the midpoint of the simply supported to continuous composite beam bridge structure, the pier body of the pier 2 is provided with a first reserved cableway hole, and the cable structure 5 passes through the first reserved cableway hole of the pier 2. The first reserved cableway hole is V-shaped, and the lower part of the first reserved cableway hole is a curved transition.

[0026] In this embodiment, after the concrete bridge deck in the negative bending moment zone reaches the specified strength, the cable force of the cable structure is released, which generates pressure on the bridge deck in the negative bending moment zone and improves the crack resistance of the bridge deck in the negative bending moment zone.

[0027] In this embodiment, the pre-embedded anchor point 11 is a pre-embedded ring-shaped steel bar, which is set between two steel-concrete composite beams in the transverse direction of the bridge, and the pull ring is connected to the pre-embedded ring-shaped steel bar.

[0028] In this embodiment, along the transverse bridge upwards, the steel beams 8 of adjacent steel-concrete composite beams are connected by a transverse connection system.

[0029] The construction method for improving the crack resistance of the bridge deck in the negative bending moment zone by converting a simply supported to a continuous composite beam bridge includes the following steps: Step S1, Steel Beam Fabrication: The steel beams are either steel plate beams or steel box beams. First, the steel beams are divided into several segments, with the maximum length of each segment being the single-span diameter of the composite beam bridge structure. Then, the steel beams undergo a series of processes including pretreatment, material preparation, welding, cutting, assembly, and painting. The steel beams are fabricated in segments at the factory and transported to the prefabrication site. Shear studs are used for shear connection components, and arc welding is used for welding the shear studs. The shear studs should be accurately positioned and vertical. Step S2, prefabrication of concrete bridge deck: Process the formwork for prefabricated concrete bridge deck, process the reinforcing bars and tie them inside the formwork, pour concrete inside the formwork, and cover and water-cur the concrete after it has set. When the concrete bridge deck reaches the required strength, the surface of the concrete bridge deck in the wet joint is manually roughened to create a rough surface. Step S3, Steel beam simple support installation: Transport the steel beam to the bridge site, install permanent supports on the piers and abutments, install temporary supports on both sides of the permanent supports, hoist the steel beam and simply support it on the temporary supports, and install the transverse connection system between the steel beams; Step S4, Transforming Simply Supported Steel Beams into Continuous Beams: Measure the gap between the two simply supported steel beams, process the steel beam connection section, install the steel beam connection section on the permanent support, and weld it to the simply supported steel beams at both ends. Remove the temporary support, and the composite beam structure transforms from simply supported to continuous. Step S5, installation of bridge deck at mid-span: Install the concrete bridge deck at mid-span of the mid-span and side spans of the composite beam bridge structure, tie the wet joint reinforcement between the concrete bridge decks, pre-embed the ring reinforcement of the pre-embedded anchor points, pour the wet joint concrete, and carry out concrete curing. Step S6, Cable Installation and Tensioning: Locate the cable clamps on the cable, pass the cable through the reserved cableway holes in the abutment or pier, install the cable clamps and tie rods on the cable, connect the tie rods to the pre-embedded ring steel bars on the concrete bridge deck through the tie rings, install the matching anchors and clamps at the ends of the cable, use the chain hoist on the hand-operated support to hoist the jacks, align them with the center of the cable clamp holes, then install the tool anchors, clamp the cable, and use the jacks to tension both ends of the cable, tensioning both ends of the cable as synchronously as possible; after confirming that the requirements are met, remove the tensioning equipment, and the cable tensioning is complete; Step S7, Cast-in-place construction of bridge deck in negative bending moment zone: Install bridge deck formwork in negative bending moment zone, tie bridge deck reinforcement, pour bridge deck concrete in negative bending moment zone, and carry out concrete curing. Step S8, cable tensioning and removal: After the concrete bridge deck in the negative bending moment zone reaches the specified strength, the cables are tensioned using jacks, and the cables are gradually tensioned and the cable structure is removed, so that the bridge deck in the negative bending moment zone generates a certain pre-stress. Then the reserved cableway holes in the piers and abutments are sealed. Step S9, Bridge deck paving and crash barrier construction: construct bridge deck paving, tie crash barrier reinforcement bars, install crash barrier formwork, pour crash barrier concrete and cure.

[0030] In this embodiment, the steel-concrete composite beam is prefabricated in segments in the factory, and each segment is transported from the factory to a temporary segment installation platform for splicing.

[0031] Example 2: The only difference between this example and Example 1 is the anchorage position of the cable. Specifically: Figure 6 As shown, when the pier or abutment is located at the side support of a simply supported to continuous composite beam bridge structure, a second reserved cableway hole is provided on the pier body or abutment body. The second reserved cableway hole has a groove on the side of the pier or abutment, and an anchor 16 is provided on the bottom surface of the groove. The plane of the anchor is perpendicular to the second reserved cableway hole. It should be noted that the groove is sealed after the cable structure is removed.

[0032] All other specific implementation methods not described here are the same as in Example 1, and will not be repeated here. The construction steps are the same as in Example 1, and will not be repeated here.

[0033] Example 3: The difference between this example and Example 1 is as follows: Figure 7 As shown, cable sleeves are pre-embedded at the bottom of the bridge deck, and the cable heads are anchored to the cap beam of the pier.

[0034] All other specific implementation methods not described here are the same as in Example 1, and will not be repeated here. The construction steps are the same as in Example 1, and will not be repeated here.

[0035] If this invention discloses or relates to mutually fixedly connected components or structural parts, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral molding process).

[0036] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0037] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A simply supported to continuous composite beam bridge structure for improving the crack resistance of the bridge deck in the negative bending moment zone, comprising abutments on both sides, a plurality of piers distributed longitudinally between the abutments on both sides, and a composite beam structure provided between the tops of the abutments on both sides and the piers, characterized in that: The composite beam structure includes several steel-concrete composite beams spliced ​​along the transverse direction of the bridge. The lower part of the composite beam structure is provided with an upwardly protruding arch-shaped cable structure between the abutment and the pier, and between adjacent piers. The top of the protruding cable structure is anchored in the middle of the span of the composite beam structure. The bottom ends of the cable structure between the abutment and the pier are anchored to the abutment and the pier respectively. The bottom ends of the cable structure between adjacent piers are anchored to the pier. The number of spans of the cable structure is the same as the number of spans of the steel-concrete composite beam, and the cable structure consists of no less than 2 cables in the transverse direction of the bridge. The steel-concrete composite beam includes a concrete bridge deck and at least two steel beams spliced ​​along the longitudinal direction of the bridge. The concrete bridge deck is connected to the upper web of the steel beams by shear connectors. Each cable is connected to the concrete bridge deck of the steel-concrete composite beam by multiple tie rods spaced apart along the longitudinal direction of the bridge. The upper end of the tie rod is provided with a reserved hole, and a pull ring is inserted into the reserved hole. The pull ring is connected to the pre-embedded anchor point on the bottom surface of the concrete bridge deck. The lower end of the tie rod is fixed with a cable clamp, which clamps the cable. When the pier is located at the midpoint of the simply supported to continuous composite beam bridge structure, the pier body is provided with a first reserved cableway hole, and the cable structure passes through the first reserved cableway hole of the pier. The first reserved cableway hole is V-shaped and the lower part of the first reserved cableway hole is a curved transition.

2. The simply supported to continuous composite beam bridge structure for improving the crack resistance of the bridge deck in the negative bending moment zone according to claim 1, characterized in that: When the pier or abutment is located at the side support of a simply supported to continuous composite beam bridge structure, a second reserved cableway hole is provided on the pier body or abutment body. The second reserved cableway hole has a groove on the side of the pier or abutment, and an anchor is provided on the bottom surface of the groove. The plane of the anchor is perpendicular to the second reserved cableway hole.

3. The simply supported to continuous composite beam bridge structure for improving the crack resistance of the bridge deck in the negative bending moment zone according to claim 1, characterized in that: The pre-embedded anchor point is a pre-embedded ring-shaped steel bar, which is set between two steel-concrete composite beams in the transverse direction of the bridge, and the pull ring is connected to the pre-embedded ring-shaped steel bar.

4. The simply supported to continuous composite beam bridge structure for improving the crack resistance of the bridge deck in the negative bending moment zone according to claim 1, characterized in that: In steel-concrete composite beams, adjacent steel beams are connected by welding, and the concrete bridge deck is provided with wet joints.

5. A construction method for a simply supported to continuous composite beam bridge structure for improving the crack resistance of the bridge deck in the negative bending moment zone as described in any one of claims 1 to 4, characterized in that: Includes the following steps: Step S1, steel beam fabrication: The steel beam is divided into several segments, the length of which is the maximum of the single span of the composite beam bridge structure; then the steel beam is fabricated in segments in the factory and transported to the prefabrication site. Step S2, prefabrication of concrete bridge deck: Process the formwork for prefabricated concrete bridge deck, process the reinforcing bars and tie them inside the formwork, pour concrete inside the formwork, and cover and water-cur the concrete after it has set. When the concrete bridge deck reaches the required strength, the surface of the concrete bridge deck in the wet joint is manually roughened to create a rough surface. Step S3, Steel beam simple support installation: Transport the steel beam to the bridge site, install permanent supports on the piers and abutments, install temporary supports on both sides of the permanent supports, hoist the steel beam and simply support it on the temporary supports, and install the transverse connection system between the steel beams; Step S4, Transforming Simply Supported Steel Beams into Continuous Beams: Measure the gap between the two simply supported steel beams, process the steel beam connection section, install the steel beam connection section on the permanent support, and weld it to the simply supported steel beams at both ends. Remove the temporary support, and the composite beam structure transforms from simply supported to continuous. Step S5, installation of bridge deck at mid-span: Install the concrete bridge deck at mid-span of the mid-span and side spans of the composite beam bridge structure, tie the wet joint reinforcement between the concrete bridge decks, pre-embed the ring reinforcement of the pre-embedded anchor points, pour the wet joint concrete, and carry out concrete curing. Step S6, Cable Installation and Tensioning: Locate the cable clamps on the cable, pass the cable through the reserved cableway holes in the abutment or pier, install the cable clamps and tie rods on the cable, connect the tie rods to the pre-embedded ring steel bars on the concrete bridge deck through the tie rings, install the matching anchors and clamps at the ends of the cable, use the chain hoist on the hand-operated support to hoist the jacks, align them with the center of the cable clamp holes, then install the tool anchors, clamp the cable, and use the jacks to tension both ends of the cable, tensioning both ends of the cable as synchronously as possible; after confirming that the requirements are met, remove the tensioning equipment, and the cable tensioning is complete; Step S7, Cast-in-place construction of bridge deck in negative bending moment zone: Install bridge deck formwork in negative bending moment zone, tie bridge deck reinforcement, pour bridge deck concrete in negative bending moment zone, and carry out concrete curing. Step S8, cable tensioning and removal: After the concrete bridge deck in the negative bending moment zone reaches the specified strength, the cables are tensioned using jacks, and the cables are gradually tensioned and the cable structure is removed, so that the bridge deck in the negative bending moment zone generates a certain pre-stress. Then the reserved cableway holes in the piers and abutments are sealed. Step S9, Bridge deck paving and crash barrier construction: construct bridge deck paving, tie crash barrier reinforcement bars, install crash barrier formwork, pour crash barrier concrete and cure.

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