Steel-concrete combined bridge structure combined by hot-rolled section steel and formwork-free concrete bearing

Abstract

The invention discloses a steel-concrete combined bridge structure combining hot-rolled section steel and a formwork-free concrete support. The steel-concrete combined bridge structure comprises a concrete bridge deck, the formwork-free concrete support, hot-rolled H-shaped steel and a detachable limiting connecting assembly. The section of the prefabricated concrete support is of an inverted halfpace-shaped structure, and the prefabricated concrete support is arranged between an upper flange plate of the hot-rolled H-shaped steel and the bottom face of the concrete bridge deck slab and is provided with a U-shaped bent reinforcing steel bar with the two ends extending out of the upper surface of the support to be connected to the concrete bridge deck slab. At least one limiting connecting assembly used for connecting an upper flange plate of the hot-rolled H-shaped steel, the prefabricated concrete bearing and the concrete bridge deck slab is arranged in a cavity formed between the prefabricated concrete bearing and the concrete bridge deck slab, and concrete is poured and filled. According to the hot-rolled H-shaped and concrete-supported steel-concrete combined bridge structure, the welding work of a steel-concrete combined bridge can be reduced, the structure is detachable without welding, the construction efficiency is improved, the construction cost is reduced, and maintenance and replacement in the operation period are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a steel-concrete composite bridge structure supported by hot-rolled steel sections and formwork-free concrete. Background Art

[0002] The steel-concrete composite beam uses steel structure as the main beam and concrete as the bridge deck, making full use of the advantages of steel in tension and concrete in compression, effectively reducing the deadweight of the structure, with good technical and economic benefits, and is used in a large number of bridge constructions.

[0003] Most existing bridges with a span of 30m or more use welded H-shaped steel plate beams, but a large amount of welding work is time-consuming and labor-intensive, and the quality of the bridge structure is greatly affected by the quality of the welds. In particular, in bridge structures with high fatigue performance requirements, its technical and economic benefits are poor.

[0004] Hot-rolled steel has many advantages such as high cross-sectional accuracy, high production efficiency, and good mechanical properties. Using hot-rolled steel beams to replace welded H-shaped steel plate beams can effectively reduce cross-sectional welding work, improve the quality of bridge structure construction, and have better technical and economic benefits. Due to the limitations of the forming process, the cross-sectional size of hot-rolled H-shaped steel is difficult to meet the use requirements of bridges with a span of 30m or more, which is an urgent problem to be solved in promoting the application of hot-rolled steel in bridge structures.

[0005] After the service life of the structure expires, it is difficult to separate and disassemble the concrete slab and the steel beam, and the broken and dismantled materials and components are difficult to recycle, which will generate a lot of construction waste. Based on this, a detachable composite beam structure based on hot-rolled steel is proposed, which is of great significance to promote the application of hot-rolled steel in bridge structures, handle the relationship between engineering construction and environmental protection, and promote the sustainable development of bridge construction. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a steel-concrete composite bridge structure that is supported by hot-rolled steel sections and unformed concrete.

[0007] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0008] In a first aspect, the present invention provides a steel-concrete composite bridge structure combining hot-rolled steel and formwork-free concrete supports, comprising a concrete bridge deck, a precast concrete support, a corrugated steel plate, a hot-rolled H-shaped steel, and a detachable limit connection assembly;

[0009] The cross-sections of the precast concrete support and the corrugated steel plate are both inverted step-shaped structures. The precast concrete support is matched and embedded in the corrugated steel plate and is arranged between the upper flange plate of the hot-rolled H-shaped steel and the bottom surface of the concrete bridge deck. The precast concrete support is equipped with U-shaped bent steel bars whose two ends extend out of the upper surface of the support and are connected to the concrete bridge deck, and is provided with at least one limiting connection component for connecting the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the precast concrete support and the concrete bridge deck.

[0010] Furthermore, the position-limiting connection assembly includes a high-strength bolt, a high-strength nut, an internally threaded sleeve, a threaded steel bar and a position-limiting steel plate frame;

[0011] The limit steel plate frame is embedded in the bottom of the precast concrete support and presents a cavity structure with an open bottom surface. A plurality of bolt holes are opened on the transverse steel plate away from the precast concrete support.

[0012] The high-strength bolts pass through the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the cavity of the limit steel plate frame and the transverse steel plate from bottom to top, and are sequentially sleeved with the high-strength nut and the lower half of the internal threaded sleeve when passing through the bolt hole of the transverse steel plate;

[0013] The threaded steel bar is fixedly connected in the concrete bridge deck and the lower end is connected to the upper half of the internal threaded sleeve.

[0014] Furthermore, the limiting steel plate frame includes a transverse steel plate and a vertical connecting side plate connected to the peripheral side of the transverse steel plate, and a cavity for later maintenance is formed between the transverse steel plate and the vertical connecting side plate.

[0015] Furthermore, a hollow cavity running through from top to bottom is opened in the middle of the precast concrete support for setting the limiting connection assembly, and concrete is poured and filled between the upper hollow cavity portion of the transverse steel plate and the concrete bridge deck to form an integrated connection.

[0016] In a second aspect, the present invention provides a construction method of the steel-concrete composite bridge structure as described in the first aspect, comprising the following method steps:

[0017] Fabrication of precast concrete supports, corrugated steel plates, hot-rolled H-beams and removable limit connection components;

[0018] The hot-rolled H-shaped steel is positioned and installed under the concrete bridge deck of the bridge structure under construction, and a corrugated steel plate and a matching embedded precast concrete support are placed on the upper flange plate, and the bent steel bars of the precast concrete support are extended into the concrete bridge deck;

[0019] Place the limiting steel plate frame of the limiting connection assembly in the hollow cavity supported by the precast concrete, and align the bolt holes on the upper flange plate, the corrugated steel plate, and the transverse steel plate of the limiting steel plate frame, and pass the high-strength bolts of the limiting connection assembly through the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the cavity of the limiting steel plate frame, and the transverse steel plate in sequence, and fix them with high-strength nuts after passing through the transverse steel plate;

[0020] Connect the lower half of the internal threaded sleeve of the limited connection assembly to the high-strength bolt protruding the high-strength nut, connect the threaded steel bar of the limited connection assembly to the upper half of the internal threaded sleeve, and adjust the vertical connection position of the internal threaded sleeve, the high-strength bolt and the threaded steel bar so that the threaded steel bar at least partially extends into the concrete bridge deck;

[0021] Concrete mortar is poured simultaneously in the precast concrete supporting hollow cavity and the concrete bridge deck, so that the bent steel bars, threaded steel bars, the precast concrete supporting hollow cavity, the internal threaded sleeve and the high-strength nut are wrapped with concrete, and the precast concrete supporting hollow cavity and the concrete bridge deck are formed in one piece.

[0022] In a third aspect, the present invention provides a steel-concrete composite bridge structure combined with hot-rolled steel and formwork-free concrete support, including a precast concrete bridge deck, a corrugated steel plate, a hot-rolled H-shaped steel and a detachable limit connection assembly;

[0023] The bottom surface of the precast concrete bridge deck is provided with a convex block extending downward in an inverted step shape, and a post-casting hole penetrating the precast concrete bridge deck is reserved on the convex block.

[0024] The cross section of the corrugated steel plate is an inverted terrace structure matching the protruding block, and is arranged between the upper flange plate of the hot-rolled H-shaped steel and the bottom surface of the concrete bridge deck.

[0025] A limiting connection component for connecting the upper flange plate of the hot-rolled H-shaped steel, the precast concrete support and the concrete bridge deck is arranged in the post-casting hole, and the filling concrete is poured.

[0026] Furthermore, the position-limiting connection assembly includes a high-strength bolt, a high-strength nut, an internally threaded sleeve, a threaded steel bar and a position-limiting steel plate frame;

[0027] The limit steel plate frame is arranged at the post-casting hole, presenting a cavity structure with an opening at the bottom, and a plurality of corresponding bolt holes are opened on the transverse steel plate, the corrugated steel plate, and the upper flange plate of the hot-rolled H-shaped steel supported away from the precast concrete, and the high-strength bolts are successively passed through the bolt holes on the upper flange plate, the corrugated steel plate and the transverse steel plate from bottom to top, and then sleeved with high-strength nuts and connected to the lower half of the internal threaded sleeve;

[0028] The threaded steel bar is fixedly connected in the concrete bridge deck and the lower end is connected to the upper half of the internal threaded sleeve.

[0029] In a fourth aspect, the present invention provides a steel-concrete composite bridge structure combined with hot-rolled steel and formwork-free concrete support, including a cast-in-place concrete bridge deck, a corrugated steel plate and a hot-rolled H-shaped steel;

[0030] A concrete support extending downward in an inverted step-shaped manner is arranged on the bottom surface of the cast-in-place concrete bridge deck, the corrugated steel plate is in an inverted step-shaped manner matching the concrete support, and the concrete support is embedded downward in the corrugated steel plate;

[0031] The bottom of the corrugated steel plate is fixedly arranged on the upper flange plate of the hot-rolled H-shaped steel, the top ends of the bent parts on both sides are respectively extended upward to be connected to the cast-in-place concrete bridge deck and form a bent extension part outward respectively, and the bent parts are respectively provided with a plurality of through holes which are sleeved on the transverse steel bars in the cast-in-place concrete bridge deck.

[0032] In a fifth aspect, the present invention provides a construction method of the steel-concrete composite bridge structure as described in the fourth aspect, comprising the following method steps:

[0033] Rolling of corrugated steel sheets from flat steel sheets;

[0034] After rolling, the bottom surface of the corrugated steel plate is the same width as the upper flange plate of the hot-rolled H-shaped steel, and the bending angle on both sides is 45°. A number of standard bolt holes are pre-opened on the bottom surface of the corrugated steel plate along the longitudinal direction of the bridge, and a number of perforations are pre-opened on the bent part along the transverse direction of the bridge;

[0035] The upper flange plate of the hot-rolled H-shaped steel is pre-opened with standard bolt holes, which correspond to the bolt holes on the bottom surface of the corrugated steel plate;

[0036] The hot-rolled H-shaped steel and the corrugated steel plate are laminated and fixed by high-strength bolts, and the high-strength bolts are equipped with high-strength nuts and high-strength washers;

[0037] After the hot-rolled H-beam and the corrugated steel plate are laminated, the hot-rolled H-beam and the corrugated steel plate are hoisted as a whole;

[0038] After the hoisting is completed, the transverse reinforcement in the cast-in-place concrete bridge deck is arranged to pass through several holes in the corrugated steel plate;

[0039] Then the formwork is set up inside the cast-in-place concrete bridge deck, the longitudinal reinforcement is tied, the concrete bridge deck is poured, and an integral concrete support is formed inside the corrugated steel plate.

[0040] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the steel-concrete composite bridge structure combined with hot-rolled steel and formwork-free concrete support and the construction method thereof adopt concrete bridge deck, precast concrete support, hot-rolled H-shaped steel and detachable limit connection components, which reduces the welding work of steel-concrete composite beams, realizes structural detachability, improves construction efficiency and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a cross-sectional schematic diagram of a steel-concrete composite bridge structure provided by an embodiment of the present invention, which is a combination of hot-rolled steel and formwork-free concrete support;

[0042] Figure 2 is a structural schematic diagram of a position-limiting connection assembly provided according to an embodiment of the present invention;

[0043] Figure 3 It is a cross-sectional schematic diagram of another steel-concrete composite bridge structure provided by an embodiment of the present invention, which is a combination of hot-rolled steel and formwork-free concrete support.

[0044] In the figure:

[0045] 1. Bridge deck; 2. H-shaped steel; 3. Support; 4. Bending steel bar; 5. Upper flange plate; 6. Bolt hole; 7. Cavity; 8. High-strength bolt; 9. High-strength nut; 10. Internally threaded sleeve; 11. Threaded steel bar; 12. Transverse steel plate; 13. Vertical connecting side plate; 14. Transverse steel bar; 15. Perforation; 16. Corrugated steel plate; 17. Bending and stretching part. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0049] like Figure 1 As shown, an embodiment of the present invention provides a steel-concrete composite bridge structure combining hot-rolled steel and formwork-free concrete support, including a concrete bridge deck 1, a precast concrete support 3, a corrugated steel plate 16, a hot-rolled H-shaped steel 2 and a detachable limit connection assembly.

[0050] The cross-sections of the precast concrete support 3 and the corrugated steel plate 16 are both inverted step-shaped structures. The precast concrete support 3 is matched and embedded in the corrugated steel plate 16, and is arranged between the upper flange plate 5 of the hot-rolled H-shaped steel 2 and the bottom surface of the concrete bridge deck 1. The precast concrete support 3 is provided with U-shaped bent steel bars 4 whose two ends extend out of the upper surface of the support 3 and are connected to the concrete bridge deck 1, and at least one limiting connection component is provided for connecting the upper flange plate 5 of the hot-rolled H-shaped steel 2, the corrugated steel plate 16, the precast concrete support 3 and the concrete bridge deck 1.

[0051] like Figure 1 , Figure 2 As shown, the position-limiting connection assembly includes a high-strength bolt 8, a high-strength nut 9, an internal threaded sleeve 10, a threaded steel bar 11 and a position-limiting steel plate frame;

[0052] The limiting steel plate frame is embedded in the bottom of the precast concrete support 3 and presents a cavity structure with an opening on the bottom surface. A plurality of bolt holes 6 are opened on the transverse steel plate 12 away from the precast concrete support 3.

[0053] The high-strength bolt 8 passes through the upper flange plate 5 of the hot-rolled H-shaped steel 2, the corrugated steel plate 16, the cavity of the limit steel plate frame and the transverse steel plate 12 from bottom to top, and is sleeved with the high-strength nut 9 and the lower half of the internal threaded sleeve 10 in sequence when passing through the bolt hole 6 of the transverse steel plate 12;

[0054] The threaded steel bar 11 is fixedly connected in the concrete bridge deck 1 and the lower end is connected to the upper half of the internal threaded sleeve 10 .

[0055] In this embodiment, the limiting steel plate frame includes a transverse steel plate 12 and a vertical connecting side plate 13 connected to the periphery of the transverse steel plate 12. The transverse steel plate 12 and the vertical connecting side plate 13 together form a cavity for later maintenance.

[0056] A hollow cavity 7 is provided in the middle of the precast concrete support 3 and is used to set a limit connection component. Concrete is poured and filled between the hollow cavity 7 on the upper part of the transverse steel plate 12 and the concrete bridge deck 1 to form an integrated connection.

[0057] In a second aspect, the present invention provides a construction method of the steel-concrete composite bridge structure as in the first aspect, comprising the following method steps:

[0058] Produce precast concrete supports 3, corrugated steel plates 16, hot-rolled H-shaped steels 2 and detachable limit connection components;

[0059] The hot-rolled H-shaped steel 2 is positioned and installed under the concrete bridge deck 1 of the bridge structure, and the corrugated steel plate 16 and the matched embedded precast concrete support 3 are placed on the upper flange plate 5, and the bent steel bars 4 of the precast concrete support 3 are extended into the concrete bridge deck 1;

[0060] Place the limiting steel plate frame of the limiting connection assembly in the hollow cavity 7 of the precast concrete support 3, and adjust and align the bolt holes 6 on the upper flange plate 5, the corrugated steel plate 16, and the transverse steel plate 12 of the limiting steel plate frame, and sequentially pass the high-strength bolts 8 of the limiting connection assembly through the upper flange plate 5, the corrugated steel plate 16, the cavity of the limiting steel plate frame and the transverse steel plate 12 of the hot-rolled H-shaped steel 2, and fix them with high-strength nuts 9 after passing through the transverse steel plate 12;

[0061] Connect the lower half of the internal threaded sleeve 10 of the limited connection assembly to the high-strength bolt 8 protruding the high-strength nut 9, and connect the threaded steel bar 11 of the limited connection assembly to the upper half of the internal threaded sleeve 10, and adjust the vertical connection position of the internal threaded sleeve 10, the high-strength bolt 8, and the threaded steel bar 11 so that the threaded steel bar 11 at least partially extends into the concrete bridge deck 1;

[0062] Concrete mortar is poured simultaneously in the hollow cavity 7 of the precast concrete support 3 and the concrete bridge deck 1, so that the bent steel bars 4, the threaded steel bars 11, the hollow cavity 7 of the precast concrete support 3, the internal threaded sleeve 10, and the high-strength nut 9 are wrapped with concrete, and the hollow cavity 7 of the precast concrete support 3 and the concrete bridge deck 1 are formed as one piece.

[0063] In a third aspect, the present invention provides a steel-concrete composite bridge structure combined with hot-rolled steel and formwork-free concrete support, comprising a precast concrete bridge deck 1, a corrugated steel plate 16, a hot-rolled H-shaped steel 2 and a detachable limit connection assembly;

[0064] The bottom surface of the precast concrete bridge deck 1 is provided with a raised block extending downward in an inverted step shape, and a post-casting hole penetrating the precast concrete bridge deck 1 is reserved on the raised block.

[0065] The cross section of the corrugated steel plate 16 is an inverted step-shaped structure matching the raised block, and is arranged between the upper flange plate 5 of the hot-rolled H-shaped steel 2 and the bottom surface of the concrete bridge deck 1.

[0066] A limiting connection assembly for connecting the upper flange plate 5 of the hot-rolled H-shaped steel 2, the precast concrete support 3 and the concrete bridge deck 1 is arranged in the post-cast hole, and the filling concrete is poured.

[0067] like Figure 2 As shown, the position-limiting connection assembly includes a high-strength bolt 8, a high-strength nut 9, an internal threaded sleeve 10, a threaded steel bar 11 and a position-limiting steel plate frame;

[0068] The limiting steel plate frame is arranged at the post-casting hole, presenting a cavity structure with an opening at the bottom, and a plurality of corresponding bolt holes 6 are opened on the transverse steel plate 12, the corrugated steel plate 16, and the upper flange plate 5 of the hot-rolled H-shaped steel 2 away from the precast concrete support 3, and the high-strength bolts 8 pass through the bolt holes 6 on the upper flange plate 5, the corrugated steel plate 16, and the transverse steel plate 12 from bottom to top in sequence, and then are sleeved with high-strength nuts 9 and connected to the lower half of the internal threaded sleeve 10;

[0069] The threaded steel bar 11 is fixedly connected in the concrete bridge deck 1 and the lower end is connected to the upper half of the internal threaded sleeve 10 .

[0070] Fourthly, Figure 3 As shown, the present invention provides a steel-concrete composite bridge structure combined with hot-rolled steel and formwork-free concrete support, including a cast-in-place concrete bridge deck 1, a corrugated steel plate 16 and a hot-rolled H-shaped steel 2;

[0071] A concrete support 3 extending downward in an inverted step-shaped manner is arranged on the bottom surface of the cast-in-place concrete bridge deck 1, and a corrugated steel plate 16 is in an inverted step-shaped manner matching the concrete support 3, and the concrete support 3 is embedded downward in the corrugated steel plate 16;

[0072] The bottom of the corrugated steel plate 16 is fixedly arranged on the upper flange plate 5 of the hot-rolled H-shaped steel 2, and the top ends of the bent parts on both sides are respectively extended upward to be connected to the cast-in-place concrete bridge deck 1 and form a bent extension part 17 outward respectively, and the bent parts are respectively provided with a plurality of through holes 15 which are sleeved on the transverse steel bars 14 in the cast-in-place concrete bridge deck 1.

[0073] In this embodiment, the cross section of the corrugated steel plate 16 is an inverted trapezoidal structure, and is arranged on the upper surface of the upper flange plate 5 of the hot-rolled H-shaped steel 2. The corrugated steel plate 16 is connected to the hot-rolled H-shaped steel 2 by high-strength bolts 8. The concrete bridge deck 1 and the concrete support 3 are cast in place.

[0074] The corrugated steel plate 16 serves as a template for pouring concrete support 3, and the bent portion of the corrugated steel plate 16 extends deep into the concrete bridge deck 1. A plurality of standard bolt holes 6 are provided on the bottom surface of the corrugated steel plate 16; a plurality of through holes 15 are provided along the longitudinal direction of the bridge at the portion of the corrugated steel plate 16 extending into the concrete bridge deck 1.

[0075] The upper flange plate 5 of the hot-rolled H-shaped steel 2 is provided with a plurality of standard bolt holes 6 , which correspond to the plurality of standard bolt holes 6 on the bottom surface of the corrugated steel plate 16 .

[0076] The high-strength bolts 8 pass through the upper flange plate 5 of the hot-rolled H-shaped steel 2 and the corrugated steel plate 16 in sequence, and the high-strength bolts 8 are correspondingly equipped with high-strength nuts 9 and high-strength washers.

[0077] In this embodiment, the concrete bridge deck 1 is a reinforced concrete structure, and the transverse steel bars 14 pass through a plurality of holes 15 formed in the corrugated steel plate 16 to serve as shear connectors. The longitudinal steel bars are arranged in two layers.

[0078] The concrete bridge deck 1 and the concrete support 3 are cast together.

[0079] In a fifth aspect, the present invention provides a construction method of the steel-concrete composite bridge structure as in the fourth aspect, comprising the following method steps:

[0080] Rolling a corrugated steel sheet 16 from a flat steel sheet;

[0081] After rolling, the bottom surface of the corrugated steel plate 16 is the same width as the upper flange plate 5 of the hot-rolled H-shaped steel 2, and the bending angles on both sides are 45 degrees. A plurality of standard bolt holes 6 are pre-opened on the bottom surface of the corrugated steel plate 16 along the longitudinal direction of the bridge, and a plurality of through holes 15 are pre-opened on the bent part along the transverse direction of the bridge.

[0082] The upper flange plate 5 of the hot-rolled H-shaped steel 2 is pre-opened with standard bolt holes 6, which correspond to the plurality of bolt holes on the bottom surface of the corrugated steel plate 16;

[0083] The hot-rolled H-shaped steel 2 and the corrugated steel plate 16 are laminated and fixed by high-strength bolts 8, and the high-strength bolts 8 are equipped with high-strength nuts 9 and high-strength washers;

[0084] After the hot-rolled H-shaped steel 2 and the corrugated steel plate 16 are laminated, the hot-rolled H-shaped steel 2 and the corrugated steel plate 16 are hoisted as a whole;

[0085] After the hoisting is completed, the transverse reinforcement bars 14 in the in-situ concrete bridge deck 1 are arranged to pass through the plurality of perforations 15 of the corrugated steel plate 16;

[0086] Then, the formwork is set up inside the cast-in-place concrete bridge deck 1, the longitudinal reinforcement is tied, and the pouring of the concrete bridge deck 1 is completed, and an integrally formed concrete support 3 is formed inside the corrugated steel plate 16.

[0087] The cross-sectional dimensions of the hot-rolled H-beam 22 are selected from the dimensions specified in "Hot-rolled H-beam 22 and Some T-beams" GB / T 11263-2017. The entire structure is hot-rolled to reduce the welding work of the steel-concrete composite beam, improve construction efficiency, reduce costs, and to a certain extent promote the development of bridge structures towards green and high-performance.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A steel-concrete composite bridge structure composed of hot-rolled steel and unsupported concrete support, characterized in that: It includes concrete bridge deck, precast concrete supports, corrugated steel plates, hot-rolled H-beams and detachable limit connection components; The cross-sections of the precast concrete support and the corrugated steel plate are both inverted step-shaped structures. The precast concrete support is matched and embedded in the corrugated steel plate and is arranged between the upper flange plate of the hot-rolled H-shaped steel and the bottom surface of the concrete bridge deck. The precast concrete support is equipped with U-shaped bent steel bars whose two ends extend out of the upper surface of the support and are connected to the concrete bridge deck, and is provided with at least one limiting connection component for connecting the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the precast concrete support and the concrete bridge deck.

2. The steel-concrete composite bridge structure composed of hot-rolled steel and unsupported concrete support according to claim 1 is characterized in that: The position-limiting connection assembly includes a high-strength bolt, a high-strength nut, an internal threaded sleeve, a threaded steel bar and a position-limiting steel plate frame; The limit steel plate frame is embedded in the bottom of the precast concrete support and presents a cavity structure with an open bottom surface. A plurality of bolt holes are opened on the transverse steel plate away from the precast concrete support. The high-strength bolts pass through the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the cavity of the limit steel plate frame and the transverse steel plate from bottom to top, and are sequentially sleeved with the high-strength nut and the lower half of the internal threaded sleeve when passing through the bolt hole of the transverse steel plate; The threaded steel bar is fixedly connected in the concrete bridge deck and the lower end is connected to the upper half of the internal threaded sleeve.

3. The steel-concrete composite bridge structure supported by hot-rolled steel and unsupported concrete according to claim 2 is characterized in that: The limiting steel plate frame includes a transverse steel plate and a vertical connecting side plate connected to the peripheral side of the transverse steel plate. The transverse steel plate and the vertical connecting side plate together form a cavity for later maintenance.

4. The steel-concrete composite bridge structure composed of hot-rolled steel and unsupported concrete support according to claim 2 is characterized in that: A hollow cavity that runs through from top to bottom is opened in the middle of the precast concrete support for setting the limit connection assembly, and concrete is poured and filled between the upper hollow cavity part of the transverse steel plate and the concrete bridge deck to form an integrated connection.

5. A construction method for the steel-concrete composite bridge structure as claimed in claims 1 to 4, characterized in that: The method comprises the following steps: Fabrication of precast concrete supports, corrugated steel plates, hot-rolled H-beams and removable limit connection components; The hot-rolled H-shaped steel is positioned and installed under the concrete bridge deck of the bridge structure under construction, and a corrugated steel plate and a matching embedded precast concrete support are placed on the upper flange plate, and the bent steel bars of the precast concrete support are extended into the concrete bridge deck; Place the limiting steel plate frame of the limiting connection assembly in the hollow cavity supported by the precast concrete, and align the bolt holes on the upper flange plate, the corrugated steel plate, and the transverse steel plate of the limiting steel plate frame, and pass the high-strength bolts of the limiting connection assembly through the upper flange plate of the hot-rolled H-shaped steel, the corrugated steel plate, the cavity of the limiting steel plate frame, and the transverse steel plate in sequence, and fix them with high-strength nuts after passing through the transverse steel plate; Connect the lower half of the internal threaded sleeve of the limited connection assembly to the high-strength bolt protruding the high-strength nut, connect the threaded steel bar of the limited connection assembly to the upper half of the internal threaded sleeve, and adjust the vertical connection position of the internal threaded sleeve, the high-strength bolt and the threaded steel bar so that the threaded steel bar at least partially extends into the concrete bridge deck; Concrete mortar is poured simultaneously in the precast concrete supporting hollow cavity and the concrete bridge deck, so that the bent steel bars, threaded steel bars, the precast concrete supporting hollow cavity, the internal threaded sleeve and the high-strength nut are wrapped with concrete, and the precast concrete supporting hollow cavity and the concrete bridge deck are formed in one piece.

6. A steel-concrete composite bridge structure composed of hot-rolled steel and unformed concrete support, characterized in that: It includes precast concrete bridge deck, corrugated steel plate, hot-rolled H-beam and detachable limit connection components; The bottom surface of the precast concrete bridge deck is provided with a convex block extending downward in an inverted step shape, and a post-casting hole penetrating the precast concrete bridge deck is reserved on the convex block. The cross section of the corrugated steel plate is an inverted terrace structure matching the protruding block, and is arranged between the upper flange plate of the hot-rolled H-shaped steel and the bottom surface of the concrete bridge deck. A limiting connection component for connecting the upper flange plate of the hot-rolled H-shaped steel, the precast concrete support and the concrete bridge deck is arranged in the post-casting hole, and the filling concrete is poured.

7. The steel-concrete composite bridge structure combined with hot-rolled steel and unsupported concrete according to claim 6, characterized in that: The position-limiting connection assembly includes a high-strength bolt, a high-strength nut, an internal threaded sleeve, a threaded steel bar and a position-limiting steel plate frame; The limit steel plate frame is arranged at the post-casting hole, presenting a cavity structure with an opening at the bottom, and a plurality of corresponding bolt holes are opened on the transverse steel plate, the corrugated steel plate, and the upper flange plate of the hot-rolled H-shaped steel supported away from the precast concrete, and the high-strength bolts are successively passed through the bolt holes on the upper flange plate, the corrugated steel plate and the transverse steel plate from bottom to top, and then sleeved with high-strength nuts and connected to the lower half of the internal threaded sleeve; The threaded steel bar is fixedly connected in the concrete bridge deck and the lower end is connected to the upper half of the internal threaded sleeve.

8. A steel-concrete composite bridge structure composed of hot-rolled steel and unsupported concrete support, characterized in that: It includes cast-in-place concrete bridge deck, corrugated steel plate and hot-rolled H-beam; A concrete support extending downward in an inverted step-shaped manner is arranged on the bottom surface of the cast-in-place concrete bridge deck, the corrugated steel plate is in an inverted step-shaped manner matching the concrete support, and the concrete support is embedded downward in the corrugated steel plate; The bottom of the corrugated steel plate is fixedly arranged on the upper flange plate of the hot-rolled H-shaped steel, the top ends of the bent parts on both sides are respectively extended upward to be connected to the cast-in-place concrete bridge deck and form a bent extension part outward respectively, and the bent parts are respectively provided with a plurality of through holes which are sleeved on the transverse steel bars in the cast-in-place concrete bridge deck.

9. A construction method for a steel-concrete composite bridge structure as claimed in claim 8, characterized in that: The method comprises the following steps: Rolling of corrugated steel sheets from flat steel sheets; After rolling, the bottom surface of the corrugated steel plate is the same width as the upper flange plate of the hot-rolled H-shaped steel, and the bending angle on both sides is 45°. A number of standard bolt holes are pre-opened on the bottom surface of the corrugated steel plate along the longitudinal direction of the bridge, and a number of perforations are pre-opened on the bent part along the transverse direction of the bridge; The upper flange plate of the hot-rolled H-shaped steel is pre-opened with standard bolt holes, which correspond to the bolt holes on the bottom surface of the corrugated steel plate; The hot-rolled H-shaped steel and the corrugated steel plate are laminated and fixed by high-strength bolts, and the high-strength bolts are equipped with high-strength nuts and high-strength washers; After the hot-rolled H-beam and the corrugated steel plate are laminated, the hot-rolled H-beam and the corrugated steel plate are hoisted as a whole; After the hoisting is completed, the transverse reinforcement in the cast-in-place concrete bridge deck is arranged to pass through several holes in the corrugated steel plate; Then the formwork is set up inside the cast-in-place concrete bridge deck, the longitudinal reinforcement is tied, the concrete bridge deck is poured, and an integral concrete support is formed inside the corrugated steel plate.

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