Composite beam bridge deck steel form connecting structure and composite beam bridge deck construction method

Abstract

The application discloses a kind of combined beam bridge deck slab steel formwork connecting structure and combined beam bridge deck slab construction method, it is related to bridge deck slab technical field, combined beam bridge deck slab steel formwork connecting structure includes steel formwork section and connecting component, two adjacent steel formwork sections are connected by connecting component;Steel formwork section includes steel bottom die and steel side die, steel bottom die joint seam top is provided with bottom die top layer splice plate, bottom is provided with bottom die bottom layer splice plate, and three are fixedly connected by bottom die high-strength bolt;The inboard of steel side die joint seam is provided with side die inboard splice plate, and the outboard is provided with side die outboard splice plate, and three are fixedly connected by side die high-strength bolt;The top of steel bottom die is fixed with bottom die transverse stiffener and bottom die longitudinal stiffener.The present application joint seam connection is reliable, construction is convenient, ensure that formwork will not occur transverse and longitudinal deformation in the process of concrete pouring.

Description

Technical Field

[0001] This invention relates to the field of bridge deck technology, and in particular to a steel formwork connection structure for composite beam bridge decks and a construction method for composite beam bridge decks. Background Technology

[0002] Traditional composite beam bridge decks are constructed by erecting wooden formwork on-site on steel beams and then pouring concrete. This method requires extensive work under the bridge during the erection and removal of the wooden formwork, and the poor sealing and weak connections between the formwork panels can lead to concrete leakage through gaps or even complete formwork collapse, negatively impacting construction progress and quality. Therefore, composite bridge decks with steel bottom formwork have been increasingly adopted in the engineering field. This type of bridge deck structure involves prefabricating steel bottom formwork in a factory to replace the wooden bottom formwork, welding the bottom formwork to the steel beams on-site, and then pouring concrete into the bottom formwork. The steel bottom formwork does not need to be removed and can still contribute to the load-bearing capacity of the bridge deck after the concrete hardens. However, the prefabricated steel bottom formwork is limited by factory manufacturing and transportation conditions, necessitating segmental splicing to assemble the entire structure. The reliability of the splicing between the steel formwork panels directly affects the deformation of the steel formwork during concrete pouring and the durability of the bridge deck during service, requiring serious attention from the engineering community.

[0003] The existing composite beam bridge deck formwork is mostly bottom formwork. When pouring concrete, the sides still need to be surrounded by wooden formwork. The erection and dismantling of wooden formwork still requires a large amount of work on site. In addition, only transverse stiffening ribs are arranged on the bottom formwork, and it is believed that only the transverse direction of the bridge deck will deform during the pouring process. However, the actual construction situation shows that the longitudinal direction of the bottom formwork will also deform to varying degrees when pouring concrete. These deformations will also have an adverse effect on the construction quality of the bridge deck. At present, the splicing joints between steel bottom formworks are mainly adopted by welding and gluing steel plates, but both of these methods have limitations. The main problems with the welding method between steel formworks are as follows: (1) Adjacent segments are only connected by top welds, and the welds run along the transverse direction of the bridge deck. The ability to resist the longitudinal deformation of the formwork during concrete pouring is weak; (2) The welds have high requirements for welding technology. Welding can easily cause deformation of the plates and generate initial stress in the plates, affecting the construction quality of the plates and posing hidden dangers to the later service performance and durability of the bridge deck. The method of pasting steel plates between steel formwork and bonding them with adhesive solved the problems that occurred during welding. However, the performance of the epoxy adhesive used for bonding varies, and the bonding quality is easily affected by environmental factors such as season, temperature, and humidity, which can also lead to problems with unreliable connections.

[0004] In view of this, we propose a steel formwork connection structure for composite beam bridge deck and a construction method for composite beam bridge deck to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a connection structure for steel formwork of composite beam bridge deck and a construction method for composite beam bridge deck, so as to solve the problems existing in the prior art. The joint connection is reliable, the construction is convenient, and the formwork will not undergo lateral and longitudinal deformation during the concrete pouring process.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a steel formwork connection structure for a composite beam bridge deck, comprising steel formwork segments and connecting members, wherein two adjacent steel formwork segments are connected by the connecting members; The steel formwork segment includes a steel bottom formwork and steel side formwork. The steel side formwork is fixed to both sides of the steel bottom formwork. Bottom formwork bolt holes are opened at both ends of the longitudinal bridge direction of the steel bottom formwork, and side formwork bolt holes are opened at both ends of the longitudinal bridge direction of the steel side formwork. The connecting components include a bottom formwork top splicing plate, a bottom formwork bottom splicing plate, a side formwork inner splicing plate, a side formwork outer splicing plate, bottom formwork high-strength bolts, and side formwork high-strength bolts. After two adjacent steel formwork segments are spliced ​​together, a steel bottom formwork splicing joint and a steel side formwork splicing joint are formed. A top-layer splicing plate is provided at the top of the steel bottom formwork joint, and a bottom-layer splicing plate is provided at the bottom. The top-layer splicing plate and the bottom-layer splicing plate are provided with bolt holes corresponding to the bolt holes on both sides of the steel bottom formwork joint. High-strength bolts are used to fix the steel bottom formwork, the top-layer splicing plate, and the bottom-layer splicing plate through the bolt holes. An inner splicing plate for the side mold is provided on the inner side of the steel side mold splice joint, and an outer splicing plate for the side mold is provided on the outer side. The inner and outer splicing plates of the side mold have bolt holes that correspond one-to-one with the bolt holes of the side mold on both sides of the steel side mold splice joint. The high-strength bolts of the side mold pass through the bolt holes of the side mold and the bolt holes of the side mold splicing plates to fix and connect the steel side mold, the inner splicing plate, and the outer splicing plate. The top of the steel bottom mold is fixed with transverse stiffening ribs and longitudinal stiffening ribs.

[0007] In one embodiment, a slanted haunch is fixedly provided at the top plate of the steel beam corresponding to the bottom plate of the steel bottom mold, and a longitudinal stiffening rib of the bottom mold is fixedly provided at the junction of the slanted haunch and the bottom plate of the steel bottom mold.

[0008] In one embodiment, the transverse stiffening ribs and the longitudinal stiffening ribs of the bottom mold are each provided with a plurality of circular holes spaced apart along their length.

[0009] In one embodiment, the steel bottom mold, the steel side mold, the bottom splicing plate of the bottom mold, and the outer splicing plate of the side mold are made of weathering steel; the top splicing plate of the bottom mold, the inner splicing plate of the side mold, the transverse stiffening rib of the bottom mold, and the longitudinal stiffening rib of the bottom mold are made of ordinary steel; among the high-strength bolts of the bottom mold and the high-strength bolts of the side mold, as well as the nuts used in conjunction, those exposed to the air during construction are made of weathering steel, while those embedded in the concrete are made of ordinary steel.

[0010] In one embodiment, stiffening rib bolt holes are provided at both ends of the longitudinal stiffening rib in the longitudinal direction of the bottom formwork. After two adjacent steel formwork segments are spliced ​​together, a longitudinal stiffening rib splice joint is formed. A longitudinal stiffening splice plate is provided on both sides of the longitudinal stiffening rib splice joint. The longitudinal stiffening splice plate has stiffening rib splice plate bolt holes that correspond one-to-one with the stiffening rib bolt holes on both sides of the longitudinal stiffening rib splice joint. High-strength bolts of the longitudinal stiffening rib pass through the stiffening rib bolt holes and the stiffening rib splice plate bolt holes to fix the longitudinal stiffening splice plates on both sides of the bottom formwork to the longitudinal stiffening rib.

[0011] In one embodiment, the longitudinal stiffening splicing plate of the bottom mold is made of ordinary steel; the high-strength bolts of the longitudinal stiffening ribs of the bottom mold and the nuts used in conjunction with them are made of ordinary steel.

[0012] In one embodiment, the thickness of the steel bottom mold is 8 mm; the thickness of the steel side mold is 8 mm. The height of the transverse stiffening rib of the bottom mold is 160mm, the thickness is 8mm, and the distance between two adjacent transverse stiffening ribs of the bottom mold is 300mm. The height of the longitudinal stiffening ribs of the bottom mold is 160mm and the thickness is 8mm.

[0013] In one embodiment, the circular holes are arranged at equal intervals, the distance between two adjacent circular holes is 200mm, and the diameter of the circular holes is 60mm.

[0014] In one embodiment, the steel side mold and the steel bottom mold are welded and fixed together, and the transverse stiffening ribs and longitudinal stiffening ribs of the bottom mold are welded and fixed together with the steel bottom mold.

[0015] This invention also provides a construction method for composite beam bridge deck panels, based on the above-described composite beam bridge deck steel formwork connection structure, including the following steps: The steel formwork segments are prefabricated, hoisted to the designated bridge location, and then adjacent steel formwork segments are spliced ​​together top to top. The top and bottom surfaces of the steel bottom formwork splice joint are respectively installed with the top and bottom splice plates of the bottom formwork. The steel bottom formwork, the top splice plates of the bottom formwork, and the bottom splice plates of the bottom formwork are fixedly connected by the high-strength bolts of the bottom formwork. The inner and outer splice plates of the side formwork are respectively installed on the inner and outer sides of the steel side formwork splice joint. The steel side formwork, the inner splice plates of the side formwork, and the outer splice plates of the side formwork are fixedly connected by the high-strength bolts of the side formwork. Longitudinal and transverse reinforcing bars are arranged above the steel formwork formed after the steel formwork segments are spliced ​​and fixed. The longitudinal and transverse reinforcing bars are connected by binding with wire at the intersection. Concrete is poured into the steel formwork, and the composite beam bridge deck is constructed by vibration and curing.

[0016] The present invention achieves the following technical effects compared to the prior art: The present invention provides a composite beam bridge deck steel formwork connection structure and construction method. Adjacent steel formwork segments are connected using splice plates and high-strength bolts, avoiding the cumbersome welding or gluing operations of traditional steel formwork segments, simplifying the construction process and improving efficiency. Furthermore, the high-strength bolt connection is robust, better ensuring structural structural safety. Adding steel side formwork to the existing steel bottom formwork eliminates the need for traditional wooden side formwork erected on both sides of the bottom formwork, and also serves as load-bearing components to resist deformation and loads during pouring and subsequent service, improving the overall rigidity of the bridge deck. The combined use of transverse and longitudinal stiffening ribs in the bottom formwork resists deformation in both the transverse and longitudinal directions during pouring, improving construction quality and structural safety. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the steel formwork segment in an embodiment of the present invention; Figure 2 This is a schematic diagram of the splicing of two adjacent steel formwork segments in an embodiment of the present invention; Figure 3 This is a top view of two adjacent steel template segments in an embodiment of the present invention, which are then fixedly connected by connecting members after being spliced ​​together. Figure 4This is a partial view of the connection structure between the longitudinal stiffening ribs of the bottom formwork between two adjacent steel formwork segments in an embodiment of the present invention; Figure 5 This is a bottom view of two adjacent steel template segments in an embodiment of the present invention, which are fixedly connected by connecting members after being spliced ​​together. Figure 6 This is a side view of two adjacent steel template segments being spliced ​​together and fixedly connected by connecting members in an embodiment of the present invention. Figure 7 This is a schematic diagram of the arrangement of longitudinal and transverse reinforcing bars in an embodiment of the present invention; Figure 8 This is a schematic diagram of the composite beam bridge deck in an embodiment of the present invention.

[0019] In the diagram: 1-Steel formwork segment, 2-Steel bottom formwork, 3-Steel side formwork, 4-Bottom formwork bolt holes, 5-Side formwork bolt holes, 6-Top layer splicing plate of bottom formwork, 7-Bottom layer splicing plate of bottom formwork, 8-Inner splicing plate of side formwork, 9-Outer splicing plate of side formwork, 10-High-strength bolts of bottom formwork, 11-High-strength bolts of side formwork, 12-Steel bottom formwork splicing joint, 13-Steel side formwork splicing joint, 14-Transverse stiffening rib of bottom formwork, 15-Longitudinal stiffening rib of bottom formwork, 16-Slanted haunch, 17-Round hole, 18-Stiffening rib bolt holes, 19-Longitudinal stiffening rib splicing joint of bottom formwork, 20-Longitudinal stiffening splicing plate of bottom formwork, 21-High-strength bolts of longitudinal stiffening rib of bottom formwork, 22-Longitudinal reinforcement, 23-Transverse reinforcement, 24-Steel formwork, 25-Composite beam bridge deck. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a connection structure for steel formwork of composite beam bridge deck and a construction method for composite beam bridge deck, so as to solve the problems existing in the prior art. The joint connection is reliable, the construction is convenient, and the formwork will not undergo lateral and longitudinal deformation during the concrete pouring process.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 like Figures 1-6As shown, this embodiment provides a steel formwork connection structure for a composite beam bridge deck, including steel formwork segments 1 and connecting members, with adjacent steel formwork segments 1 connected by the connecting members; The steel formwork segment 1 includes a steel bottom formwork 2 and a steel side formwork 3. The steel side formwork 3 is fixed to the two sides of the steel bottom formwork 2. Bottom formwork bolt holes 4 are opened at both ends of the longitudinal bridge direction of the steel bottom formwork 2, and side formwork bolt holes 5 are opened at both ends of the longitudinal bridge direction of the steel side formwork 3. The connecting components include a bottom formwork top splicing plate 6, a bottom formwork bottom splicing plate 7, a side formwork inner splicing plate 8, a side formwork outer splicing plate 9, a bottom formwork high-strength bolt 10, and a side formwork high-strength bolt 11. After two adjacent steel formwork segments 1 are spliced ​​together, a steel bottom formwork splicing joint 12 and a steel side formwork splicing joint 13 are formed. A top-layer splicing plate 6 is installed at the top of the steel bottom formwork splice joint 12, and a bottom-layer splicing plate 7 is installed at the bottom. The top-layer splicing plate 6 and the bottom-layer splicing plate 7 are provided with bottom formwork splicing plate bolt holes that correspond one-to-one with the bottom formwork bolt holes 4 on both sides of the steel bottom formwork splice joint 12. The high-strength bolts 10 of the bottom formwork pass through the bottom formwork bolt holes 4 and the bottom formwork splicing plate bolt holes to fix and connect the steel bottom formwork 2, the top-layer splicing plate 6 and the bottom-layer splicing plate 7. An inner splicing plate 8 is provided on the inner side of the steel side formwork splice joint 13, and an outer splicing plate 9 is provided on the outer side. The inner splicing plate 8 and the outer splicing plate 9 are provided with bolt holes corresponding to the bolt holes 5 on both sides of the steel side formwork splice joint 13. The high-strength bolts 11 of the side formwork pass through the bolt holes 5 and the bolt holes of the side formwork splicing plate to fix and connect the steel side formwork 3, the inner splicing plate 8 and the outer splicing plate 9. The top of the steel bottom mold 2 is fixed with a transverse stiffening rib 14 and a longitudinal stiffening rib 15.

[0024] In this embodiment, adjacent steel formwork segments are connected using splicing plates and high-strength bolts, avoiding the cumbersome welding or gluing operations of traditional steel formwork segments, simplifying the construction process and improving construction efficiency. Furthermore, the robust high-strength bolt connections better ensure the structural safety under load. Adding steel side formwork to the existing steel bottom formwork eliminates the need for the wooden side formwork originally erected on both sides of the bottom formwork, and also serves as load-bearing components to resist deformation and loads during pouring and subsequent service, improving the overall rigidity of the bridge deck. The transverse stiffening ribs 14 and longitudinal stiffening ribs 15 of the bottom formwork work together to resist deformation in both the transverse and longitudinal directions during pouring, improving construction quality and structural safety.

[0025] In this embodiment, the steel bottom formwork 2 is located at the bottom of the composite bridge deck structure and is made of 8mm weathering steel plate. It can be used as a bottom formwork for concrete pouring and can also participate in the overall stress during the bridge operation phase. A row of bottom formwork bolt holes 4 are opened at both ends of the steel bottom formwork 2 in the longitudinal direction of the bridge. An inclined haunch 16 is fixedly set at the top plate of the steel beam corresponding to the steel bottom formwork 2. A longitudinal stiffening rib 15 is fixedly set at the junction of the inclined haunch 16 and the steel bottom formwork 2. During construction, the inclined haunch 16 is welded to the steel beam. The steel side formwork 3 is arranged on both sides of the steel bottom formwork 2 and is made of 8mm weathering steel plate. Its length is the same as the prefabricated length of the steel bottom formwork 2, and its height is 260mm. It can be used as a side formwork when pouring concrete and can also resist longitudinal deformation during the pouring of the bridge deck. The steel side formwork 3 is welded to the steel bottom formwork 2. A row of side formwork bolt holes 5 are opened at both ends of the steel side formwork 3 in the longitudinal direction of the bridge to facilitate the splicing between segments.

[0026] In this embodiment, the transverse stiffening ribs 14 of the bottom formwork are arranged above the steel bottom formwork 2, using 8mm ordinary steel plates, and welded to the steel bottom formwork 2. The transverse stiffening ribs 14 extend transversely along the steel bottom formwork 2, with a height of 160mm. Circular holes 17 are formed on them, with each hole 17 evenly spaced. The distance between two adjacent holes 17 is 200mm, and the diameter of each hole 17 is 60mm. The distance between two adjacent transverse stiffening ribs 14 is 300mm. During concrete pouring, the transverse stiffening ribs 14 can resist the transverse deformation of the bottom formwork. After the concrete hardens, they can serve as PBL connectors to strengthen the connection between the concrete bridge deck and the steel beams, and also as load-bearing components to replace the traditional lower layer of steel mesh in the concrete bridge deck for load bearing.

[0027] In this embodiment, the longitudinal stiffening ribs 15 of the bottom formwork are arranged at the armholes of the steel bottom formwork 2, using 8mm ordinary steel plates, with the same length as the steel bottom formwork 2 and a height of 160mm. They are welded to the steel bottom formwork 2, and are also welded to the intersections with the transverse stiffening ribs 14 of the bottom formwork. Circular holes 17 are opened on the longitudinal stiffening ribs 15, with each hole 17 evenly spaced, the distance between two adjacent holes 17 being 200mm, and the diameter of each hole 17 being 60mm. A row of bolt holes is opened at each end of the longitudinal stiffening rib. The longitudinal stiffening ribs 15 of the bottom formwork can resist longitudinal deformation of the bottom formwork during the casting process, and can later participate in the overall stress as longitudinal reinforcement and PBL connectors.

[0028] In this embodiment, the bottom splicing plate 7 of the bottom formwork is made of weathering steel, and the top splicing plate 6 of the bottom formwork is made of ordinary steel. Both are 8mm thick. Two rows of bolt holes are provided on both the top splicing plate 6 and the bottom splicing plate 7 for connecting adjacent steel bottom formwork segments 2. For the high-strength bolts 10 and 11 of the bottom and side forms, as well as the nuts used, weathering steel is used for bolts exposed to air during construction, while ordinary steel is used for bolts embedded in the concrete.

[0029] In this embodiment, the outer splicing plate 9 of the side mold is weathering steel, and the inner splicing plate 8 of the side mold is ordinary steel. Both are 8mm thick. Two rows of side mold splicing plate bolt holes are provided on both the outer splicing plate 9 and the inner splicing plate 8 of the side mold for connecting adjacent steel side mold segments 3.

[0030] In this embodiment, stiffening rib bolt holes 18 are provided at both ends of the longitudinal stiffening rib 15 of the bottom formwork in the longitudinal direction. After two adjacent steel formwork segments 1 are spliced ​​together, a longitudinal stiffening rib splice joint 19 of the bottom formwork is formed. A longitudinal stiffening splice plate 20 of the bottom formwork is provided on both sides of the longitudinal stiffening rib splice joint 19 of the bottom formwork. The longitudinal stiffening splice plate 20 of the bottom formwork has stiffening rib splice plate bolt holes that correspond one-to-one with the stiffening rib bolt holes 18 on both sides of the longitudinal stiffening rib splice joint 19 of the bottom formwork. The high-strength bolts 21 of the longitudinal stiffening rib of the bottom formwork pass through the stiffening rib bolt holes 18 and the stiffening rib splice plate bolt holes to fix the longitudinal stiffening splice plates 20 of the bottom formwork on both sides to the longitudinal stiffening rib 15 of the bottom formwork.

[0031] In this embodiment, the bottom mold longitudinal stiffening splicing plate 20 is made of ordinary steel with a thickness of 8mm. Two rows of stiffening rib splicing plate bolt holes are provided on the bottom mold longitudinal stiffening rib 15 for connecting adjacent segments. The bottom mold longitudinal stiffening rib high-strength bolts 21 and the nuts used in conjunction are made of ordinary steel.

[0032] In the connection structure of this embodiment, the steel structure exposed to the air is made of weathering steel, which improves the service life of the composite beam bridge deck; the steel structure embedded in the concrete is made of ordinary steel. The splicing plates and steel formwork are connected by high-strength bolts. The bolts (nuts) exposed to the air are made of weathering steel, while the bolts (nuts) embedded in the concrete are made of ordinary steel, which controls the project cost and takes into account both the durability and economy of the bridge.

[0033] Example 2 like Figures 7-8 As shown, this embodiment provides a construction method for composite beam bridge deck, based on the steel formwork connection structure for composite beam bridge deck described in Embodiment 1, including the following steps: Precast steel formwork segment 1: After the steel formwork segment 1 is hoisted to the designated bridge position, adjacent steel formwork segments 1 are spliced ​​together top to top. The top and bottom surfaces of the steel bottom formwork splice joint 12 are respectively installed with the top splice plate 6 and the bottom splice plate 7 of the bottom formwork. The steel bottom formwork 2, the top splice plate 6 and the bottom splice plate 7 of the bottom formwork are fixedly connected by the bottom formwork high-strength bolts 10. The inner side splice plate 8 and the outer side splice plate 9 of the side formwork are respectively installed on the inner and outer sides of the steel side formwork splice joint 13. The steel side formwork 3, the inner side splice plate 8 and the outer side splice plate 9 of the side formwork are fixedly connected by the side formwork high-strength bolts 11. Longitudinal reinforcement 22 and transverse reinforcement 23 are arranged above the steel formwork 24 formed after each steel formwork segment 1 is spliced ​​and fixed. The longitudinal reinforcement 22 and transverse reinforcement 23 are connected by binding with iron wire at the intersection. Concrete is poured into the steel formwork 24 and then vibrated and cured until the concrete strength reaches the design requirements, thus completing the construction of the composite beam bridge deck 25.

[0034] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A connection structure for steel formwork of composite beam bridge deck, characterized in that: It includes steel formwork segments and connecting members, with two adjacent steel formwork segments connected by the connecting members; The steel formwork segment includes a steel bottom formwork and steel side formwork. The steel side formwork is fixed to both sides of the steel bottom formwork. Bottom formwork bolt holes are opened at both ends of the longitudinal bridge direction of the steel bottom formwork, and side formwork bolt holes are opened at both ends of the longitudinal bridge direction of the steel side formwork. The connecting components include a bottom formwork top splicing plate, a bottom formwork bottom splicing plate, a side formwork inner splicing plate, a side formwork outer splicing plate, bottom formwork high-strength bolts, and side formwork high-strength bolts. After two adjacent steel formwork segments are spliced ​​together, a steel bottom formwork splicing joint and a steel side formwork splicing joint are formed. A top-layer splicing plate is provided at the top of the steel bottom formwork joint, and a bottom-layer splicing plate is provided at the bottom. The top-layer splicing plate and the bottom-layer splicing plate are provided with bolt holes corresponding to the bolt holes on both sides of the steel bottom formwork joint. High-strength bolts are used to fix the steel bottom formwork, the top-layer splicing plate, and the bottom-layer splicing plate through the bolt holes. An inner splicing plate for the side mold is provided on the inner side of the steel side mold splice joint, and an outer splicing plate for the side mold is provided on the outer side. The inner and outer splicing plates of the side mold have bolt holes that correspond one-to-one with the bolt holes of the side mold on both sides of the steel side mold splice joint. The high-strength bolts of the side mold pass through the bolt holes of the side mold and the bolt holes of the side mold splicing plates to fix and connect the steel side mold, the inner splicing plate, and the outer splicing plate. The top of the steel bottom mold is fixed with transverse stiffening ribs and longitudinal stiffening ribs.

2. The composite beam bridge deck steel formwork connection structure according to claim 1, characterized in that: An oblique armhole is fixedly provided at the top plate of the steel beam corresponding to the bottom plate of the steel bottom formwork, and a longitudinal stiffening rib of the bottom formwork is fixedly provided at the junction of the oblique armhole and the bottom plate of the steel bottom formwork.

3. The steel formwork connection structure for composite beam bridge deck as described in claim 1, characterized in that: The transverse stiffening ribs and longitudinal stiffening ribs of the bottom mold are each provided with multiple circular holes spaced apart along their length.

4. The steel formwork connection structure for composite beam bridge deck as described in claim 1, characterized in that: The steel bottom formwork, the steel side formwork, the bottom splicing plate of the bottom formwork, and the outer splicing plate of the side formwork are made of weathering steel; the top splicing plate of the bottom formwork, the inner splicing plate of the side formwork, the transverse stiffening ribs of the bottom formwork, and the longitudinal stiffening ribs of the bottom formwork are made of ordinary steel; among the high-strength bolts of the bottom formwork, the high-strength bolts of the side formwork, and the nuts used in conjunction, those exposed to the air during construction are made of weathering steel, while those embedded in the concrete are made of ordinary steel.

5. The steel formwork connection structure for composite beam bridge deck as described in claim 1, characterized in that: The longitudinal stiffening ribs of the bottom formwork have stiffening rib bolt holes at both ends in the longitudinal direction. After two adjacent steel formwork segments are spliced ​​together, a longitudinal stiffening rib splice joint is formed. Longitudinal stiffening splicing plates are respectively set on both sides of the longitudinal stiffening rib splice joint. The longitudinal stiffening splicing plates have stiffening rib splicing plate bolt holes that correspond one-to-one with the stiffening rib bolt holes on both sides of the longitudinal stiffening rib splice joint. High-strength bolts of the longitudinal stiffening ribs pass through the stiffening rib bolt holes and the stiffening rib splicing plate bolt holes to fix the longitudinal stiffening splicing plates on both sides of the bottom formwork to the longitudinal stiffening ribs.

6. The steel formwork connection structure for composite beam bridge deck as described in claim 5, characterized in that: The longitudinal stiffening splicing plate of the bottom mold is made of ordinary steel; the high-strength bolts of the longitudinal stiffening ribs of the bottom mold and the nuts used in conjunction with them are made of ordinary steel.

7. The steel formwork connection structure for composite beam bridge deck as described in claim 1, characterized in that: The thickness of the steel bottom mold is 8mm; the thickness of the steel side mold is 8mm; The height of the transverse stiffening rib of the bottom mold is 160mm, the thickness is 8mm, and the distance between two adjacent transverse stiffening ribs of the bottom mold is 300mm. The height of the longitudinal stiffening ribs of the bottom mold is 160mm and the thickness is 8mm.

8. The steel formwork connection structure for composite beam bridge deck as described in claim 3, characterized in that: The circular holes are evenly spaced, with a distance of 200mm between two adjacent circular holes, and a diameter of 60mm for each circular hole.

9. The steel formwork connection structure for composite beam bridge deck according to claim 1, characterized in that: The steel side mold and the steel bottom mold are welded and fixed together, and the transverse stiffening ribs and longitudinal stiffening ribs of the bottom mold are welded and fixed together with the steel bottom mold.

10. A method for constructing a composite beam bridge deck, characterized in that, The composite beam bridge deck steel formwork connection structure according to any one of claims 1 to 9 includes the following steps: The steel formwork segments are prefabricated, hoisted to the designated bridge location, and then adjacent steel formwork segments are spliced ​​together top to top. The top and bottom surfaces of the steel bottom formwork splice joint are respectively installed with the top and bottom splice plates of the bottom formwork. The steel bottom formwork, the top splice plates of the bottom formwork, and the bottom splice plates of the bottom formwork are fixedly connected by the high-strength bolts of the bottom formwork. The inner and outer splice plates of the side formwork are respectively installed on the inner and outer sides of the steel side formwork splice joint. The steel side formwork, the inner splice plates of the side formwork, and the outer splice plates of the side formwork are fixedly connected by the high-strength bolts of the side formwork. Longitudinal and transverse reinforcing bars are arranged above the steel formwork formed after the steel formwork segments are spliced ​​and fixed. The longitudinal and transverse reinforcing bars are connected by binding with wire at the intersection. Concrete is poured into the steel formwork, and the composite beam bridge deck is constructed by vibration and curing.

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