A connection device and construction method for the negative bending moment zone of a steel-concrete composite beam

Abstract

This invention relates to a connection device and construction method for the negative bending moment zone of a steel-concrete composite structure. The connection device is installed between the steel beam and the bridge deck. The device includes a rubber-PTFE composite plate disposed in the negative bending moment zone of the steel beam. The rubber-PTFE composite plate comprises two layers of rubber sheets (upper and lower) and two layers of PTFE sheets (between the rubber and PTFE sheets). The lower rubber sheet is connected to the upper surface of the steel beam, and the upper rubber sheet is connected to the bridge deck. Relative sliding and friction are allowed between the two PTFE sheets. After concrete pouring, relative sliding between the two PTFE sheets is permitted. This invention uses relative sliding between the two PTFE sheets instead of relative sliding between the steel beam and the concrete bridge deck, significantly increasing the prestress within the bridge deck, effectively controlling cracking in the negative bending moment zone of the steel-concrete composite structure, and simplifying the construction process for applying prestress.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and in particular relates to a connection device and construction method for the negative bending moment zone of a steel-concrete composite beam. Background Technology

[0002] Over the past two decades, steel-concrete composite structures have been widely used in my country, especially in bridge engineering, where my country has entered a period of rapid development. Steel-concrete composite structures can fully utilize the mechanical properties of steel and concrete, significantly reducing their self-weight compared to concrete structures, shortening construction time, and providing good seismic performance. However, with the continuous promotion and application of steel-concrete composite bridges, many defects have also emerged. Among these, cracking of the concrete bridge deck in the negative bending moment zone is a particularly prominent problem.

[0003] Currently, in engineering practice, methods such as arranging prestressed steel strands within the bridge deck, delayed bridge deck installation, bearing jacking, and mid-span ballast are commonly used to reduce tensile stress on the bridge deck at the pier top. Among these, arranging prestressed steel strands within the bridge deck is the most common method. However, in actual engineering projects, the effect of controlling bridge deck cracking using this method is not ideal. The principle of arranging prestressed steel strands within the bridge deck is to tension the prestressed steel strands before the bridge deck is combined with the steel beam, thus putting the bridge deck into a compressive state and storing a certain amount of compressive stress within the bridge deck to prevent tensile cracking in the negative bending moment zone. In the design calculation process, this method usually assumes that the steel beam has no frictional effect on the bridge deck, only a vertical support effect, and that the prestressing is entirely applied to the bridge deck.

[0004] However, research shows that during actual construction, there is a frictional contact surface between the bridge deck and the steel beam. Even with the use of methods such as applying oil or release agents, the static friction coefficient between the steel and concrete interface can reach more than 0.4. This causes the prestress to be transferred to the interior of the steel beam through friction, and the prestress effect in the bridge deck cannot reach the theoretical calculation effect. Therefore, it is particularly necessary to invent a steel-concrete composite beam negative bending moment zone connection structure that conforms to the calculation theory in order to improve the prestress level in the bridge deck. Summary of the Invention

[0005] The present invention aims to address the problem that the prestress loss caused by friction during the application of prestress to the bridge deck in the negative bending moment zone of a steel-concrete composite beam reduces the load-bearing performance of the bridge deck in this zone. In view of the above problem, the present invention proposes a connection device and construction method for the negative bending moment zone of a steel-concrete composite beam.

[0006] The connection device for the negative bending moment zone of a prestressed steel-concrete composite bridge provided by this invention is a connection device between the bridge deck and the steel beam at the non-shear stud location in the negative bending moment zone of the prestressed steel-concrete composite bridge. This device can reduce the friction effect between the concrete bridge deck and the steel beam, significantly improve the prestress level in the bridge deck, improve the stress performance of the steel-concrete composite structure, and control the generation of cracks in the negative bending moment zone of the steel-concrete composite beam.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides a connection device for the negative bending moment zone of a steel-concrete composite structure, which is disposed between the steel beam and the bridge deck. The connection device includes a rubber-polytetrafluoroethylene composite plate disposed in the negative bending moment zone of the steel beam. The rubber-polytetrafluoroethylene composite plate includes two layers of rubber plates located on the upper and lower layers, and two layers of polytetrafluoroethylene plates disposed between the two layers of rubber plates. The lower layer of rubber plate is connected to the upper surface of the steel beam, and the upper layer of rubber plate is connected to the bridge deck. Relative sliding friction is allowed between the two layers of polytetrafluoroethylene plates.

[0009] In one embodiment of the present invention, the rubber-polytetrafluoroethylene composite board is arranged in a layered manner with rubber board, polytetrafluoroethylene board, polytetrafluoroethylene board and rubber board in sequence.

[0010] In one embodiment of the present invention, the rubber sheet and the polytetrafluoroethylene sheet are connected by adhesive bonding, and the two polytetrafluoroethylene sheets are not bonded together.

[0011] In one embodiment of the present invention, the rubber sheet located at the bottom layer is connected to the upper surface of the steel beam by adhesive bonding.

[0012] In one embodiment of the present invention, the bridge deck is a cast-in-place bridge deck, which is directly cast onto the surface of the upper rubber sheet and connected to the rubber sheet by casting.

[0013] In one embodiment of the present invention, the negative bending moment zone connection device of the steel-concrete composite structure further includes bolts and fastening nuts. The bolts and fastening nuts are used to fix the rubber-PTFE composite plate to the steel beam before the bridge deck is poured. Before the bridge deck is poured, the rubber-PTFE composite plate is connected to the steel beam by bolts and fastening nuts. The bolts and fastening nuts ensure a stable connection between the rubber plate and the PTFE plate and the steel beam, guaranteeing that the relative position of the two PTFE plates does not change during concrete pouring.

[0014] In one embodiment of the present invention, the steel beam is provided with steel beam bolt holes in the negative bending moment zone, and the rubber-polytetrafluoroethylene composite plate is provided with plate bolt holes, the plate bolt holes corresponding one-to-one with the steel beam bolt holes, and the bolts are tightened by fastening nuts after passing through the steel beam bolt holes and the plate bolt holes.

[0015] In one embodiment of the present invention, the rubber sheet and the polytetrafluoroethylene sheet are provided with bolt holes at the same positions.

[0016] In one embodiment of the present invention, the bolt includes a bolt shank and a bolt nut. The bolt shank is threaded and passes through bolt holes in the steel beam and plate. One end of the bolt shank is provided with a bolt nut, and the other end is fastened by a fastening nut.

[0017] In one embodiment of the present invention, the bolt nut is located below the steel beam, and a steel washer is provided between the bolt nut and the steel beam. The fastening nut is located above the rubber-PTFE composite plate, and a steel washer is provided between the fastening nut and the rubber-PTFE composite plate.

[0018] In one embodiment of the present invention, a group of shear studs is welded at intervals in the negative bending moment zone of the steel beam. The shear studs are used to be cast into the bridge deck of the negative bending moment zone of the steel beam. The rubber-PTFE composite plate is disposed at the intervals of the shear studs in the negative bending moment zone of the steel beam.

[0019] This invention also provides a construction method for a connection device in the negative bending moment zone of a steel-concrete composite structure, comprising the following steps:

[0020] Step S1: After the steel beams are manufactured in the factory, bolt holes for the steel beams are drilled at the designed locations, and then the steel beams are erected according to the actual construction process.

[0021] Step S2: The factory produces polytetrafluoroethylene (PTFE) sheets and rubber sheets, glues the PTFE sheets and rubber sheets together, then makes bolt holes in the PTFE sheets and rubber sheets, and transports them to the construction site.

[0022] Step S3: Attach one side of the rubber sheet that is not bonded to the PTFE sheet to the upper flange of the steel beam. Place the other PTFE sheet in a two-to-one arrangement to form a rubber-PTFE composite sheet arranged in the order of rubber sheet-PTFE sheet-PTFE sheet-rubber sheet.

[0023] Step S4: Tighten the bolts from below the steel beam. The bolt shank passes through the upper flange of the steel beam and the rubber-PTFE composite plate. A steel washer is placed between the bolt and the steel beam.

[0024] Step S5: Install steel washers and fastening nuts sequentially from the bolt shank end of the bolt to prevent the two PTFE plates from moving relative to each other;

[0025] Step S6: According to the construction design, pour concrete bridge deck above the rubber-PTFE composite plate to form the bridge deck. After the concrete strength of the bridge deck meets the requirements, tighten the bolts from below the steel beam to remove the bolt threads from the rubber-PTFE composite plate.

[0026] In addition, shear studs are welded at intervals in the negative bending moment zone of the steel beam. The shear studs are used to be cast into the bridge deck in the negative bending moment zone of the steel beam. The rubber-PTFE composite plate is set at the intervals of the shear studs in the negative bending moment zone of the steel beam.

[0027] The device of this invention prevents relative displacement between two polytetrafluoroethylene (PTFE) plates during the pouring of the bridge deck to form the negative bending moment zone, using bolts and fastening nuts. After the concrete pouring is completed, tightening the bolts allows relative sliding between the two PTFE plates. This invention uses relative sliding between two PTFE plates instead of relative sliding between the steel beam and the concrete bridge deck, significantly increasing the prestress within the bridge deck, effectively controlling cracking in the negative bending moment zone of the steel-concrete composite structure, simplifying the construction process for applying prestress, and improving the economic benefits of the steel-concrete composite structure.

[0028] Compared with existing steel-concrete composite beam negative bending moment zone connection devices and construction methods, the technical solution of this invention has the following advantages:

[0029] (1) The mutual friction between polytetrafluoroethylene plates is used instead of the mutual friction between steel and concrete. When tensioning prestress in the negative bending moment zone, the prestress loss during the tensioning process of the prestressed steel strands of the bridge deck is reduced, and the cracking of the concrete bridge deck in the negative bending moment zone of the steel-concrete composite beam structure is effectively controlled.

[0030] (2) It significantly improves the efficiency of applying prestress, and can reduce other methods of applying prestress during construction, thereby greatly improving the economic benefits of steel-concrete composite structure construction. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural schematic diagram (top view) of the connection device in the negative bending moment zone of the steel-concrete composite beam in Embodiment 1 of the present invention.

[0032] Figure 2 This is a three-dimensional structural schematic diagram (view from below) of the connection device in the negative bending moment zone of the steel-concrete composite beam in Embodiment 1 of the present invention.

[0033] Figure 3 This is a three-dimensional structural diagram of the steel beam in the connection device of the negative bending moment zone of the steel-concrete composite beam in Embodiment 1 of the present invention.

[0034] Figure 4This is a schematic diagram and enlarged detail view of the three-dimensional structure of the rubber-polytetrafluoroethylene composite plate in the connection device of the negative bending moment zone of the steel-concrete composite beam in Embodiment 1 of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure after the rubber plate is connected to the steel beam in the connection device of the negative bending moment zone of the steel-concrete composite beam in Embodiment 1 of the present invention.

[0036] Figure 6 This is a three-dimensional structural diagram of the bolts, steel washers, and nuts in the connection device of the steel-concrete composite beam in the negative bending moment zone of Embodiment 1 of the present invention.

[0037] Figure 7 This is a schematic diagram of one embodiment of the installation and connection device in Embodiment 1 of the present invention.

[0038] Figure 8 This is a schematic diagram of the structure between the bridge deck and the rubber-PTFE composite plate in Embodiment 2 of the present invention.

[0039] Reference numerals: 1. Rubber-PTFE composite plate; 11. Rubber plate; 12. PTFE plate; 13. Bolt hole in plate; 2. Steel beam; 21. Bolt hole in steel beam; 3. Steel washer; 4. Fastening nut; 5. Bolt; 51. Bolt thread; 52. Bolt nut; 6. Shear stud group; 7. Bridge deck. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0042] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0045] Example

[0046] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 This embodiment provides a connection device for the negative bending moment zone of a steel-concrete composite structure, which is disposed between the steel beam 2 and the bridge deck 7. The connection device includes a rubber-polytetrafluoroethylene composite plate 1 disposed in the negative bending moment zone of the steel beam 2. The rubber-polytetrafluoroethylene composite plate 1 includes two layers of rubber plates 11 located on the upper and lower layers and two layers of polytetrafluoroethylene plates 12 disposed between the two layers of rubber plates 11. The lower layer of rubber plate 11 is connected to the upper surface of the steel beam 2, and the upper layer of rubber plate 11 is connected to the bridge deck 7. The two layers of polytetrafluoroethylene plates 12 are allowed to slide relative to each other to generate friction.

[0047] Further reference Figure 4 In this embodiment, the rubber-PTFE composite plate 1 is arranged in layers in the order of rubber plate 11, PTFE plate 12, PTFE plate 12, and rubber plate 11. The rubber plate 11 and the PTFE plate 12 are connected by adhesive bonding, but two PTFE plates 12 are not bonded together. The lower layer of rubber plate 11 is connected to the upper surface of the steel beam 2 by adhesive bonding.

[0048] Further reference Figure 7 In this embodiment, the bridge deck 7 is a cast-in-place bridge deck, which is directly cast onto the surface of the upper rubber sheet 11 and is cast and connected to the rubber sheet 11.

[0049] In this embodiment, the negative bending moment zone connection device of the steel-concrete composite structure further includes bolts 5 and fastening nuts 4. The bolts 5 and fastening nuts 4 are used to fix the rubber-PTFE composite plate 1 to the steel beam 2 before the bridge deck 7 is poured. Before the bridge deck 7 is poured, the rubber-PTFE composite plate 1 and the steel beam 2 are connected by bolts 5 and fastening nuts 4. The bolts 5 and fastening nuts 4 ensure a stable connection between the rubber plate and the PTFE plate and the steel beam, guaranteeing that the relative positions of the two PTFE plates do not change during concrete pouring.

[0050] Further reference Figure 3 , Figure 4In this embodiment, the steel beam 2 is provided with steel beam bolt holes 21 in the negative bending moment region, and the rubber-PTFE composite plate 1 is provided with plate bolt holes 13. The plate bolt holes correspond one-to-one with the steel beam bolt holes 21. The bolts 5 pass through the steel beam bolt holes 21 and the plate bolt holes 13 and are then fastened by the fastening nuts 4. The rubber plate 11 and the PTFE plate 12 are provided with plate bolt holes 13 at the same position.

[0051] Further reference Figure 6 In this embodiment, the bolt 5 includes a bolt shank 51 and a bolt nut 52. The bolt shank 51 has threads and passes through the bolt hole 21 of the steel beam and the bolt hole 13 of the plate. One end of the bolt shank 51 is provided with a bolt nut 52, and the other end is fastened by a fastening nut 4.

[0052] In this embodiment, the bolt nut 52 is located below the steel beam 2, and a steel washer 3 is provided between the bolt nut 4 and the steel beam 2. The fastening nut 5 is located above the rubber-PTFE composite plate 1, and a steel washer 3 is provided between the fastening nut 4 and the rubber-PTFE composite plate 1.

[0053] Further reference Figure 1 In this embodiment, a group of shear studs 6 is welded at intervals in the negative bending moment zone of the steel beam 2. The group of shear studs 6 is used to be cast into the bridge deck 7 in the negative bending moment zone of the steel beam 2. The rubber-polytetrafluoroethylene composite plate 1 is set at the intervals of the shear studs 2 in the negative bending moment zone of the steel beam 2.

[0054] This embodiment also provides a construction method for the connection device in the negative bending moment zone of a steel-concrete composite structure, including the following steps:

[0055] Step S1, Reference Figure 3 After the factory produces steel beam 2, bolt holes 21 are drilled at the designed location, and then the steel beam is erected according to the actual construction process.

[0056] Step S2, Reference Figure 4 The factory produces polytetrafluoroethylene (PTFE) sheet 12 and rubber sheet 11, glues PTFE sheet 12 and rubber sheet 11 together, then makes bolt holes 13 on PTFE sheet 12 and rubber sheet 11, and transports them to the construction site.

[0057] Step S3, Reference Figure 5 One side of the rubber sheet 11 that is not bonded to the polytetrafluoroethylene sheet 12 is bonded to the upper flange of the steel beam 2, and the other polytetrafluoroethylene sheet is placed in the form of two polytetrafluoroethylene sheets facing each other, forming a rubber-polytetrafluoroethylene composite plate 1 with the rubber sheet 11-polytetrafluoroethylene sheet 12-polytetrafluoroethylene sheet 12-rubber sheet 11 arranged in sequence.

[0058] Step S4, Reference Figure 1 , Figure 2 , Figure 6 Tighten bolt 5 from below steel beam 2. Bolt 5 passes through the upper flange of steel beam 2 and rubber-PTFE composite plate 1. Steel washer 3 is placed between bolt 5 and steel beam 2.

[0059] Step S5: Install steel washers 3 and fastening nuts 4 sequentially from the bolt end of bolt 5 to prevent the two polytetrafluoroethylene plates 12 from moving relative to each other;

[0060] Step S6, Reference Figure 7 According to the construction design, concrete bridge deck is poured on top of rubber-PTFE composite plate 1 to form bridge deck 7. After the concrete strength of bridge deck 7 meets the requirements, bolts 5 are screwed from below steel beam 2 so that the bolts of bolts 5 are removed from rubber-PTFE composite plate 1.

[0061] Shear studs 6 are welded at intervals in the negative bending moment zone of the steel beam 2. The shear studs 6 are used to be cast into the bridge deck 7 in the negative bending moment zone of the steel beam 2. The rubber-PTFE composite plate 1 is set at the intervals of the shear studs 2 in the negative bending moment zone of the steel beam 2.

[0062] Example 2

[0063] refer to Figure 8 Unlike Embodiment 1, in this embodiment, the bridge deck 7 is prefabricated directly in the factory, and the bonding construction between the rubber sheet 11 and the bridge deck 7 is completed in the factory. Then it is combined with the steel beam 2. Note that in this embodiment, the bridge deck 7 and the steel beam 2 are still connected by a set of rubber-PTFE composite plates 1; that is, the bridge deck 7 and the steel beam 2 are still arranged in the sequence of rubber sheet 11 - PTFE sheet 12 - PTFE sheet 12 - rubber sheet 11.

[0064] The device of this invention prevents relative displacement between two polytetrafluoroethylene (PTFE) plates during the pouring of the bridge deck 7 to form the negative bending moment zone, using bolts 5 and fastening nuts 4. After the concrete pouring is completed, tightening the bolts 5 allows relative sliding between the two PTFE plates. This invention uses relative sliding between two PTFE plates instead of relative sliding between the steel beam and the concrete bridge deck, significantly increasing the prestress within the bridge deck, effectively controlling cracking in the negative bending moment zone of the steel-concrete composite structure, simplifying the construction process for applying prestress, and improving the economic benefits of the steel-concrete composite structure.

[0065] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A connecting device for a steel-concrete composite structure in a negative bending moment region, characterized by, The connecting device is arranged between the steel beam (2) and the bridge deck slab (7), and comprises a rubber-polytetrafluoroethylene composite plate (1) arranged in the negative bending moment area of the steel beam (2), the rubber-polytetrafluoroethylene composite plate (1) comprises two layers of rubber plates (11) arranged in upper and lower layers and two layers of polytetrafluoroethylene plates (12) arranged between the two layers of rubber plates (11), the rubber plate (11) in the lower layer is connected with the upper surface of the steel beam (2), the rubber plate (11) in the upper layer is connected with the bridge deck slab (7), and the two layers of polytetrafluoroethylene plates (12) are allowed to slide relative to each other to generate friction.

2. A connecting device for a negative moment region of a steel-concrete composite structure according to claim 1, characterized in that The rubber-polytetrafluoroethylene composite plate (1) is arranged in the order of the rubber plate (11), the polytetrafluoroethylene plate (12), the polytetrafluoroethylene plate (12) and the rubber plate (11).

3. A device for connecting a steel-concrete composite structure according to claim 2, characterized in that The rubber plate (11) and the polytetrafluoroethylene plate (12) are connected by gluing, and the two polytetrafluoroethylene plates (12) are not glued.

4. A device for connecting a steel-concrete composite structure according to claim 1, characterized in that The rubber plate (11) in the lower layer is connected with the upper surface of the steel beam (2) by gluing.

5. A device for connecting a steel-concrete composite structure according to claim 1, characterized in that The bridge deck slab (7) is a cast-in-place bridge deck slab, and the cast-in-place bridge deck slab is directly poured on the surface of the rubber plate (11) in the upper layer and is connected with the rubber plate (11) by pouring.

6. A device for connecting a steel-concrete composite structure according to claim 1, characterized in that The steel-concrete composite structure negative bending moment area connecting device further comprises a bolt (5) and a fastening nut (4), the bolt (5) and the fastening nut (4) are used for fixing the rubber-polytetrafluoroethylene composite plate (1) on the steel beam (2) before the bridge deck slab (7) is poured, and the rubber-polytetrafluoroethylene composite plate (1) is connected with the steel beam (2) by the bolt (5) and the fastening nut (4) before the bridge deck slab (7) is poured.

7. A device for connecting a steel-concrete composite structure according to claim 6, characterized in that The steel beam (2) is provided with a steel beam bolt hole (21) in the negative bending moment area, the rubber-polytetrafluoroethylene composite plate (1) is provided with a plate bolt hole (13), the plate bolt hole corresponds to the steel beam bolt hole (21) in a one-to-one manner, the bolt (5) passes through the steel beam bolt hole (21) and the plate bolt hole (13) and is fastened by the fastening nut (4); The rubber plate (11) and the polytetrafluoroethylene plate (12) are provided with the plate bolt hole (13) at the same position.

8. A device for connecting a steel-concrete composite structure according to claim 7, characterized in that The bolt (5) comprises a bolt shank (51) and a bolt nut (52), the bolt shank (51) is provided with a thread, the bolt shank (51) passes through the steel beam bolt hole (21) and the plate bolt hole (13), one end of the bolt shank (51) is provided with the bolt nut (52), and the other end is fastened by the fastening nut (4); The bolt nut (52) is located below the steel beam (2), a steel washer (3) is arranged between the steel beam (2) and the bolt nut (52), and the fastening nut (5) is located above the rubber-polytetrafluoroethylene composite plate (1), and a steel washer (3) is arranged between the fastening nut (4) and the rubber-polytetrafluoroethylene composite plate (1).

9. The construction method of the connecting device for the negative moment area of the steel-concrete composite structure according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Step S1, after the factory produces the steel beam (2), the steel beam bolt hole (21) is drilled at the designed position, and then the steel beam is erected according to the actual construction process. Step S2, the factory produces polytetrafluoroethylene plate (12) and rubber plate (11), polytetrafluoroethylene plate (12) and rubber plate (11) are respectively glued connection, then make plate bolt hole (13) on polytetrafluoroethylene plate (12) and rubber plate (11), and transport to the construction site; Step S3, one of the rubber plate (11) is not glued with polytetrafluoroethylene plate (12) one side and the upper flange of steel beam (2) is glued, the other polytetrafluoroethylene plate is placed in the form of two polytetrafluoroethylene plates, forming rubber-polytetrafluoroethylene composite plate (1) arranged in the order of rubber plate (11)-polytetrafluoroethylene plate (12)-polytetrafluoroethylene plate (12)-rubber plate (11); Step S4, from the bottom of the steel beam (2), screw the bolt (5), the bolt screw of the bolt (5) passes through the upper flange of the steel beam (2), the rubber-polytetrafluoroethylene composite plate (1), and the steel washer (3) is arranged between the bolt (5) and the steel beam (2); Step S5, from the bolt screw end of the bolt (5), install the steel washer (3) and the fastening nut (4) in turn, so that the two polytetrafluoroethylene plates (12) do not move relative to each other; Step S6, according to the construction design, the pouring of the concrete bridge deck slab is carried out above the rubber-polytetrafluoroethylene composite plate (1), forming the bridge deck slab (7), after the concrete strength of the bridge deck slab (7) meets the requirements, the bolt (5) is screwed from the bottom of the steel beam (2), so that the bolt screw of the bolt (5) exits the rubber-polytetrafluoroethylene composite plate (1).

10. The construction method of the connecting device for the negative bending moment region of the steel-concrete composite structure according to claim 9, characterized in that, The shear stud group (6) is welded at the negative bending moment area of the steel beam (2), the shear stud group (6) is used for being poured into the bridge deck slab (7) at the negative bending moment area of the steel beam (2), and the rubber-polytetrafluoroethylene composite plate (1) is arranged at the interval position of the shear stud group (2) in the negative bending moment area of the steel beam (2).

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