Inverted cold-bending curled steel composite beam structure

Abstract

The utility model provides an inverted cold-bending curled steel composite beam structure which comprises a composite beam unit and a concrete bridge deck arranged on the composite beam unit, the composite beam unit comprises a plurality of cold-bending curled steel beams which are arranged in parallel, each cold-bending curled steel beam comprises an upper flange plate, two webs and two lower flange plates, the two lower flange plates are horizontally rolled outwards along the bottom ends of the webs, the upper flange plate, the two webs and the two lower flange plates define a hollow steel beam structure with an inverted-U-shaped cross section, a plurality of bolt penetrating holes are formed in the two lower flange plates of each cold-bent edge-rolled steel beam, and every two adjacent cold-bent edge-rolled steel beams are connected through a plurality of inter-beam lacing bars. According to the utility model, the cold-bending curled steel beams are designed into inverted structures, so that bending and torsional stress can be better resisted, the separated cold-bending curled steel beams can be conveniently and quickly connected through the lacing bars between the beams, and the construction difficulty and risk are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to an inverted cold-bent rolled steel composite beam structure. Background Art

[0002] The steel-concrete composite structure bridge is a bridge structure composed of a steel main beam and a concrete bridge deck through shear connectors. It can give full play to the respective advantages of steel and concrete, and has become a highly competitive bridge type in small and medium span bridges. As one of the steel-concrete composite bridges, the cold-formed U-shaped steel-concrete composite beam competes with the hollow slab beam bridge. Compared with the hollow slab beam bridge, the cold-formed U-shaped steel-concrete composite beam bridge has a greatly reduced amount of concrete, high material utilization rate, and good economy. On the basis of the advantages of the steel-concrete composite structure bridge, it can give full play to the advantages of cold-formed steel in terms of light weight, high strength, easy manufacturing, fast construction speed, and high degree of industrialization. Therefore, the cold-formed U-shaped steel-concrete composite beam has a wide range of application prospects in small and medium span bridge structures.

[0003] The steel main beam section of the cold-formed U-shaped steel-concrete composite beam can be divided into two types: upright and inverted. The upright steel main beam section has high bending stiffness and high material utilization, but its working platform is small during the construction stage, and it is a closed section after the bridge is completed, which makes later inspection and maintenance difficult; the inverted steel main beam solves many problems such as inconvenient construction and difficult later maintenance, but its torsional stiffness is small and it is prone to bending and torsional instability.

[0004] In summary, it is necessary to propose a composite beam structure with a new steel main beam cross-section from the perspective of optimizing the steel main beam cross-section and improving the stability, inspectability, durability and safe construction of the bridge structure. Summary of the invention

[0005] The utility model provides an inverted cold-bent hemmed steel composite beam structure to overcome the problems in the prior art.

[0006] In order to achieve the above purpose, the technical solution proposed by the utility model is:

[0007] An inverted cold-bent rolled steel composite beam structure includes a composite beam unit and a concrete bridge deck arranged on the composite beam unit, characterized in that the composite beam unit includes a plurality of cold-bent rolled steel beams arranged in parallel, each of the cold-bent rolled steel beams includes an upper flange plate, two web plates and two lower flange plates, the two lower flange plates are horizontally rolled outward along the bottom ends of the web plates, the upper flange plate, the two web plates and the two lower flange plates form a hollow steel beam structure with an inverted U-shaped cross section, a plurality of bolt through holes are opened on the two lower flange plates of each cold-bent rolled steel beam, and two adjacent cold-bent rolled steel beams are connected by a plurality of beam spacing strips.

[0008] Furthermore, the concrete bridge deck includes longitudinal stress-bearing steel bars and stirrups, and a plurality of shear nails are arranged on the upper flange plate of the cold-bent hemmed steel beam. The shear nails are inserted into the stirrups and form an integral structure through concrete pouring.

[0009] Furthermore, two adjacent cold-bent hemmed steel beams are connected by a plurality of parallel beam spacers, and both ends of each beam spacer are connected to the lower flange plate by two sets of high-strength bolts. The high-strength bolts pass through the bolt holes on the beam spacer and the lower flange plate and are fastened by washers and nuts.

[0010] Furthermore, two adjacent cold-bent hemmed steel beams are connected by a plurality of obliquely arranged beam spacers, and a plurality of the beam spacers are sequentially connected to form a continuous V-shaped structure, and both ends of each beam spacer are connected to the lower flange plate by high-strength bolts, and the high-strength bolts pass through the bolt through holes on the beam spacer and the lower flange plate, and are fastened by washers and nuts.

[0011] Furthermore, two adjacent cold-bent hemmed steel beams are connected by a plurality of staggered beam spacers, which form a continuous X-shaped structure. Both ends of each beam spacer are connected to the lower flange plate by high-strength bolts. The staggered beam spacers are connected at the overlapping parts by high-strength bolts, and the high-strength bolts pass through the bolt holes on the beam spacers and the lower flange plate and are fastened by washers and nuts.

[0012] Furthermore, it is characterized in that the cold-bent hemmed steel beam, the upper flange plate and the beam spacing strips are all coated with an anti-corrosion coating.

[0013] Furthermore, it is characterized in that the upper flange plate is horizontal to the lower flange plate, the bending angle between the upper flange plate and the web plate is 100-120°, and the bending angle between the lower flange plate and the web plate is 60-80°.

[0014] Furthermore, the upper flange plate is horizontal to the lower flange plate, the bending angle between the upper flange plate and the web plate is 105°, and the bending angle between the lower flange plate and the web plate is 75°.

[0015] Furthermore, the bends between the upper flange plate, the two webs and the two lower flange plates are rounded structures.

[0016] Furthermore, the composite beam unit also includes two groups of special-shaped rolled steel beams arranged on the outside of the cold-bent rolled steel beam, and the special-shaped rolled steel beam includes a first lower flange plate, a first web plate, a first upper flange plate, a second web plate, a second lower flange plate, a third web plate and a second upper flange plate, forming an overall cross-section similar to an S shape; the first lower flange plate is horizontally rolled outward along the bottom end of the first web plate, and the second upper flange plate is horizontally rolled outward along the top end of the third web plate, a number of shear nails are arranged on the first upper flange plate and the second upper flange plate, and a number of bolt through holes are opened on the first lower flange plate; the first lower flange plate of the special-shaped rolled steel beam is connected to the adjacent cold-bent rolled steel beam through a beam spacing strip.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model solves the problems of small working platform in the construction stage and difficult inspection and maintenance caused by the closed cross-section after the bridge is completed in the traditional upright structure by designing the cold-bent rolled steel beam as an inverted structure, and the two lower flange plates are horizontally rolled outward along the bottom end of the web plate, which significantly improves the lateral stability and bending stiffness compared with the traditional bridge structure, can better resist bending and torsional stress, and facilitates the rapid connection of separated cold-bent rolled steel beams through the beam inter-beam tie bars, which greatly reduces the construction difficulty and risk, and forms an open structural cross-section after the bridge is completed, which is convenient for later inspection and maintenance.

[0019] In the embodiment of the utility model, there can be many connection forms of the beam inter-tie bars, including parallel arrangement, oblique arrangement to form a V-shaped structure, staggered arrangement to form an X-shaped structure, etc. These connection forms not only enhance the lateral stability of the composite beam, but also further enhance the shear and bending resistance of the overall structure through high-strength bolt connection; the utility model introduces special-shaped rolled steel beams arranged on both sides to form an overall S-shaped cross-section design, so that the composite beam structure is more uniform and stable during the force-bearing process, effectively avoiding the occurrence of local instability, and improving the overall safety and reliability of the bridge.

[0020] Compared with traditional solid steel beams, the cold-bent rolled steel beams of the utility model significantly reduce the material consumption, reduce the dead weight of the structure, improve the material utilization rate, and have good economy while maintaining the same strength; in addition, the cold-bent rolled steel beams and the tie bars between beams can be prefabricated in the factory, and the on-site installation is quick and convenient, which shortens the construction period and improves the construction efficiency; at the same time, the bolt connection method of the tie bars between beams also reduces the on-site welding workload and reduces the construction difficulty and risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0022] Figure 2It is a schematic diagram of the end surface structure of Example 1 of the utility model;

[0023] Figure 3 This is a schematic diagram of the connection of the cold-bent hemmed steel beam in Example 1 of the utility model;

[0024] Figure 4 This is a schematic diagram of the connection of the special-shaped curled steel beam in Example 1 of the utility model;

[0025] In the figure, 1-cold-bent hemmed steel beam, 101-upper flange plate, 102-two web plates, 103-lower flange plate;

[0026] 2-special-shaped hemmed steel beam, 201-first lower flange plate, 202-first web plate, 203-first upper flange plate, 204-second web plate, 205-second lower flange plate, 206-third web plate, 207-second upper flange plate;

[0027] 3-concrete bridge deck, 301-longitudinal stress reinforcement, 302-stirrups;

[0028] 4- beam inter-beam tie bars;

[0029] 5- Shear studs. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0031] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent 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 a limitation on this patent.

[0032] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0033] Embodiment 1:

[0034] See also Figure 1 and Figure 2 This embodiment provides an inverted cold-bent rolled steel composite beam structure, including a composite beam unit and a concrete bridge deck 3 arranged on the composite beam unit, wherein the composite beam unit includes a plurality of parallel cold-bent rolled steel beams 1 and two groups of special-shaped rolled steel beams 2 arranged on the outside of the composite beam unit.

[0035] See also Figure 3 Specifically, each cold-formed hemmed steel beam 1 includes an upper flange plate 101, two web plates 102 and two lower flange plates 103; the two lower flange plates 103 are horizontally rolled outward along the bottom end of the web plate 102, and the entire cold-formed hemmed steel beam 1 forms an inverted U-shaped hollow steel beam structure with an edge; this design not only enhances the lateral stability of the cold-formed hemmed steel beam, but also improves its bending stiffness; in this embodiment, the bending angle between the upper flange plate 101 and the web plate 102 is 105°, and the bending angle between the two lower flange plates 103 and the two web plates 102 is 75°, see Figure 3 The overall outer edge is a trapezoidal structure that is small at the top and large at the bottom, ensuring the mechanical properties and stability of the structure.

[0036] A plurality of shear nails 5 are arranged on the upper flange plate 101 of the cold-formed rolled steel beam 1 for connecting with the concrete bridge deck 3. A plurality of bolt through holes are provided on the two lower flange plates 103 of each cold-formed rolled steel beam 1 to facilitate the subsequent connection operation of the beam spacing bars 4. Two adjacent cold-formed rolled steel beams 1 are connected by a plurality of parallel beam spacing bars 4. Specifically, both ends of each beam spacing bar 4 are connected to the lower flange plate 103 by two sets of high-strength bolts. The bolts pass through the bolt through holes on the beam spacing bar 4 and the lower flange plate 103, and are fastened by washers and nuts.

[0037] In order to ensure the stability of the outer structure, special-shaped curled steel beams 2 are also arranged on both sides of the composite beam unit, see Figure 4 The special-shaped hem steel beam 2 includes a first lower flange plate 201, a first web plate 202, a first upper flange plate 203, a second web plate 204, a second lower flange plate 205, a third web plate 206 and a second upper flange plate 207, which are sequentially connected to form an overall S-shaped cross-section.

[0038] The first lower flange plate 201 is horizontally rolled outward along the bottom end of the first web 202, and is used to be connected to the adjacent cold-bent rolled steel beam 1 through the beam spacing strip 4; the second upper flange plate 207 is horizontally rolled outward along the top end of the third web 206, and is used to be consolidated with the concrete bridge deck 3; a plurality of shear nails 5 are arranged on the first upper flange plate 203 and the second upper flange plate 207, and a plurality of bolt through holes are opened on the first lower flange plate; the first lower flange plate 201 of the special-shaped rolled steel beam 2 is connected to the adjacent cold-bent rolled steel beam 1 through the beam spacing strip 4, which has the effect of side edge sealing and further enhances the stability of the overall structure.

[0039] The concrete bridge deck 3 is arranged on the composite beam unit, and the bridge deck includes longitudinal stress-bearing steel bars 301 and stirrups 302; the cold-bent curled steel beam 1 and the special-shaped curled steel beam 2 are both provided with shear nails 5, which are penetrated in the stirrups 302 and formed into an integral structure through concrete pouring, thereby enhancing the bonding strength between the bridge deck and the steel beam and improving the shear resistance.

[0040] In addition, in order to improve the durability and corrosion resistance of the structure, an anti-corrosion coating is applied on the surfaces of the cold-bent hemmed steel beam 1, the special-shaped hemmed steel beam 2 and the beam spacing strips 4.

[0041] The construction method of the inverted cold-bent hemmed steel composite beam structure of this embodiment is as follows:

[0042] Step S1: Pre-preparing cold-bent hemmed steel beams and special-shaped hemmed steel beams

[0043] The cold-bent curled steel beam 1 and the special-shaped curled steel beam 2 are pre-assembled in the factory to ensure that each bending angle and size meets the design requirements; then a number of bolt through holes are opened in the cold-bent curled steel beam 1 and the special-shaped curled steel beam 2 to facilitate the subsequent connection operation of the beam inter-tie bars 4.

[0044] Step S3: Transport to the construction site

[0045] The prefabricated cold-bent rolled steel beams 1 and special-shaped rolled steel beams 2 are transported to the bridge site, the cold-bent rolled steel beams 1 are arranged in parallel and connected together by beam tie bars 4 to form a composite beam unit, and then the special-shaped rolled steel beams 2 are arranged in parallel on both sides of the composite beam unit and connected together by beam tie bars 4.

[0046] Step S4: Setting the concrete bridge deck

[0047] Shear studs 3 are welded on the cold-bent curled steel beam 1 and the special-shaped curled steel beam 2, and then formwork and longitudinal stress-bearing steel bars 301 and stirrups 302 are arranged on the whole, concrete is poured in the formwork, and the concrete is cured to form an integral bridge deck structure.

[0048] Step S5: Applying anti-corrosion coating

[0049] The surfaces of the cold-bent curled steel beam 1, the special-shaped curled steel beam 2 and the beam interlacing strips 4 are coated with an anti-corrosion coating to improve the durability and corrosion resistance of the structure.

[0050] Embodiment 2:

[0051] This embodiment provides an inverted cold-formed hemmed steel composite beam structure, which has the following differences compared with the structure of Embodiment 1:

[0052] Two adjacent cold-bent hemmed steel beams are connected by a plurality of obliquely arranged beam spacers, and a plurality of beam spacers are connected in sequence to form a continuous V-shaped structure; both ends of each beam spacer are connected to the lower flange plate by high-strength bolts, and the high-strength bolts pass through the bolt holes on the beam spacer and the lower flange plate, and are fastened by washers and nuts.

[0053] The other technical features of this embodiment are the same as those of Embodiment 1.

[0054] Compared with the traditional parallel arrangement of tie bars, the V-shaped structure between beams of this embodiment improves the overall stability and bending resistance of the composite beam and enhances the torsional stiffness. At the same time, it is convenient to construct and has a simple connection method, which improves construction efficiency and shortens the construction period.

[0055] Embodiment 3:

[0056] This embodiment provides an inverted cold-formed hemmed steel composite beam structure, which has the following differences compared with the structure of Embodiment 1:

[0057] Two adjacent cold-bent hemmed steel beams are connected by multiple staggered beam spacers, which form a continuous X-shaped structure. Both ends of each beam spacer are connected to the lower flange plate by high-strength bolts, and the staggered beam spacers are connected at the overlap by high-strength bolts, which pass through the bolt holes on the beam spacers and the lower flange plate and are fastened by washers and nuts.

[0058] The tie bars of the X-shaped structure of this embodiment significantly enhance the lateral stiffness and overall stability, and improve the bending and shearing resistance; the staggered tie bars between beams enhance the firmness and overall stiffness of the connection, and further improve the durability and safety of the structure.

[0059] For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. An inverted cold-formed hemmed steel composite beam structure, comprising a composite beam unit and a concrete bridge deck arranged on the composite beam unit, characterized in that: The composite beam unit includes a plurality of cold-bent rolled steel beams arranged in parallel, each of which includes an upper flange plate, two web plates and two lower flange plates. The two lower flange plates are horizontally rolled outward along the bottom ends of the web plates. The upper flange plate, the two web plates and the two lower flange plates form a hollow steel beam structure with an inverted U-shaped cross section. A plurality of bolt through holes are provided on the two lower flange plates of each cold-bent rolled steel beam, and two adjacent cold-bent rolled steel beams are connected by a plurality of beam spacing strips.

2. The inverted cold-formed hemmed steel composite beam structure according to claim 1 is characterized in that: The concrete bridge deck comprises longitudinal stress-bearing steel bars and stirrups, and a plurality of shear nails are arranged on the upper flange plate of the cold-bent hemmed steel beam. The shear nails are penetrated in the stirrups and form an integral structure through concrete pouring.

3. The inverted cold-formed hemmed steel composite beam structure according to claim 1 is characterized in that: Two adjacent cold-bent hemmed steel beams are connected by a plurality of parallel beam spacers, and both ends of each beam spacer are connected to the lower flange plate by two sets of high-strength bolts. The high-strength bolts pass through the bolt holes on the beam spacer and the lower flange plate and are fastened by washers and nuts.

4. The inverted cold-formed hemmed steel composite beam structure according to claim 1 is characterized in that: Two adjacent cold-bent hemmed steel beams are connected by a plurality of obliquely arranged beam spacers, and a plurality of beam spacers are sequentially connected to form a continuous V-shaped structure. Both ends of each beam spacer are connected to the lower flange plate by high-strength bolts, and the high-strength bolts pass through the bolt holes on the beam spacer and the lower flange plate, and are fastened by washers and nuts.

5. The inverted cold-formed hemmed steel composite beam structure according to claim 1 is characterized in that: Two adjacent cold-bent curled steel beams are connected by a plurality of staggered beam spacers, which form a continuous X-shaped structure. Both ends of each beam spacer are connected to the lower flange plate by high-strength bolts. The staggered beam spacers are connected at the overlapping parts by high-strength bolts. The high-strength bolts pass through the bolt holes on the beam spacers and the lower flange plate and are fastened by washers and nuts.

6. The inverted cold-formed hemmed steel composite beam structure according to any one of claims 3 to 5, characterized in that: The cold-bent hemmed steel beam, the upper flange plate and the beam spacing strips are all coated with an anti-corrosion coating.

7. The inverted cold-formed hemmed steel composite beam structure according to claim 1 is characterized in that: The upper flange plate is horizontal to the lower flange plate, the bending angle between the upper flange plate and the web plate is 100-120°, and the bending angle between the lower flange plate and the web plate is 60-80°.

8. The inverted cold-formed hemmed steel composite beam structure according to claim 7, characterized in that: The upper flange plate is horizontal to the lower flange plate, the bending angle between the upper flange plate and the web plate is 105°, and the bending angle between the lower flange plate and the web plate is 75°.

9. The inverted cold-formed hemmed steel composite beam structure according to claim 7, characterized in that: The bends between the upper flange plate, the two web plates and the two lower flange plates are rounded structures.

10. The inverted cold-formed hemmed steel composite beam structure according to claim 1, characterized in that: The composite beam unit also includes two groups of special-shaped rolled steel beams arranged on the outside of the cold-bent rolled steel beam, and the special-shaped rolled steel beam includes a first lower flange plate, a first web plate, a first upper flange plate, a second web plate, a second lower flange plate, a third web plate and a second upper flange plate, forming an overall cross-section similar to an S shape; the first lower flange plate is horizontally rolled outward along the bottom end of the first web plate, and the second upper flange plate is horizontally rolled outward along the top end of the third web plate. A number of shear nails are arranged on the first upper flange plate and the second upper flange plate, and a number of bolt through holes are opened on the first lower flange plate; the first lower flange plate of the special-shaped rolled steel beam is connected to the adjacent cold-bent rolled steel beam through a beam spacing strip.

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