Fabricated steel-concrete composite beam

Abstract

The utility model relates to the technical field of assembly type hybrid bridges, and discloses an assembly type steel-concrete composite beam which comprises two steel beam sections, two steel-concrete composite sections and two concrete sections which are connected in sequence, and the steel beam sections, the steel-concrete composite sections and the concrete sections are symmetrical to each other. The steel beam section comprises a top plate, a bottom plate, a side plate located between the top plate and the bottom plate and a plurality of stiffening ribs, wherein the top plate and the bottom plate are connected with each other. The stiffening ribs are distributed on the top plate, the bottom plate and the side plate. The steel-concrete combined section comprises a cell formed by an outer steel plate, an inner steel plate, an outer side plate, an inner side plate and a bearing plate which are connected with one another, first concrete is arranged in the cell, the cell and the first concrete are both P-shaped, and a first shear assembly is arranged in the first concrete; the concrete section comprises second concrete, and the second concrete is also in a P type so as to meet the construction use of the large-span mixed type bridge.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled hybrid bridges, in particular to an assembled steel-concrete combined beam. Background Art

[0002] The reasonable combination of steel and concrete can give full play to the advantages of high tensile strength and good plasticity of steel and good compressive performance of concrete. Therefore, the demand for steel-concrete composite beams in large-span railway bridges is increasing. Traditional steel-concrete composite beam construction often uses on-site assembly of steel boxes and on-site pouring of concrete, but the steel box structure is complex and the environmental factors on the construction site are complex. There are problems such as difficult quality control, high safety risks, long construction period, and traffic impact. Given that the current development of hoisting tonnage and construction technology can meet the requirements of assembled construction of steel-concrete composite beams, it is necessary to improve the existing steel-concrete composite beams to improve the quality and efficiency of bridge construction.

[0003] The Chinese invention patent with the announcement number CN106481023B discloses an assembled steel-concrete composite beam structure and its implementation method, which includes a concrete beam, a steel-concrete composite section, and a short steel beam. The concrete beam is composed of concrete, steel bars, a hole-making device, and a prestressed cable. The short steel beam is composed of a steel section, stiffening ribs, and an end plate. The steel-concrete composite section is composed of a shear key, concrete, stiffening ribs, an anchoring system, steel bars, an end plate, an upper steel flange plate, and a lower steel flange plate. The steel-concrete composite section is a transition section between the concrete beam and the short steel beam. The concrete and the steel flange of the steel-concrete composite section are connected by a shear key to jointly bear external forces. The patent adopts full factory prefabrication to shorten the hoisting construction time and reduce the construction difficulty. However, the structure of the steel-concrete structural beam is simple, and its structural strength is difficult to meet the requirements of large-span hybrid bridges. Utility Model Content

[0004] The utility model aims to provide an assembled steel-concrete combined beam to meet the needs of large-span mixed bridge construction.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an assembled steel-concrete composite beam, comprising a steel beam section, a steel-concrete composite section and a concrete section connected in sequence, wherein the steel beam section, the steel-concrete composite section and the concrete section are each provided with two mutually symmetrical sections; the steel beam section comprises a top plate, a bottom plate, a side plate located between the top plate and the bottom plate and a plurality of stiffening ribs connected to each other, and the stiffening ribs are distributed on the top plate, the bottom plate and the side plates; the steel-concrete composite section comprises a cell composed of an outer steel plate, an inner steel plate, an outer side plate, an inner side plate and a pressure plate connected to each other, wherein a first concrete is provided in the cell, and both the cell and the first concrete are P-type, and a first shear component is provided in the first concrete; the concrete section comprises a second concrete, and the second concrete is also P-type.

[0006] The beneficial effects of this solution are: the assembled construction of the combined beam is achieved by sequentially connecting the steel beam section, the steel-concrete combined section and the concrete section, and at the same time, the structural strength of the steel-concrete combined beam is improved by setting the first shear component and the stiffening ribs, so as to meet the needs of large-span hybrid bridge construction.

[0007] At the same time, multiple steel plates are set up to form cells, the first concrete and the second concrete are both P-shaped. The hollow structure inside the P-shaped structure can reduce the amount of concrete used, saving construction costs while reducing the weight of the steel-concrete composite beam, thereby ensuring the smooth and safe construction of the long-span hybrid bridge. The formed steel-concrete composite beam is a double-sided box structure as a whole, with the box body located on both sides of the composite beam. Since the current bridge construction often adopts the top-pushing construction method, the double-sided box structure of the steel-concrete composite beam can ensure the stability of movement during the construction process, thereby further ensuring the safety of the construction.

[0008] Preferably, it also includes a prestressed structure, which includes a corrugated pipe and a steel strand. The corrugated pipe runs through the first concrete and the second concrete. The steel strand is arranged in the corrugated pipe. One end of the steel strand is fixed to the pressure plate, and the other end of the steel strand extends out of the second concrete.

[0009] Preferably, the first shear component includes a plurality of through-steel bars and a plurality of shear nails, and the plurality of through-steel bars and the plurality of shear nails are distributed crosswise with each other.

[0010] Preferably, the steel-concrete combined section also includes a porous steel plate, which divides the cell into a plurality of first sub-cells and a plurality of second sub-cells, and a first shear component is provided in each of the first sub-cells and the second sub-cells, and the through steel bars and shear nails in the first sub-cells and the second sub-cells are arranged in opposite directions.

[0011] Preferably, the stiffening ribs are all T-shaped stiffening ribs, and the T-shaped stiffening ribs are all connected to the pressure plate.

[0012] Preferably, a second shear assembly is provided in the second concrete, and the second shear assembly also includes a plurality of through steel bars and a plurality of shear nails that are cross-distributed in the transverse and longitudinal directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0014] Figure 2 It is a structural schematic diagram of a longitudinal section in an embodiment of the utility model;

[0015] Figure 3 for Figure 2 Cross-sectional view of the middle BB;

[0016] Figure 4 It is a three-dimensional diagram of the partial internal structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The following is further described in detail through specific implementation methods:

[0018] The figure marks in the drawings of the specification include: steel beam section 1, top plate 11, bottom plate 12, side plate 13, T-shaped stiffening rib 14, steel-concrete combined section 2, inner steel plate 21, inner side plate 22, pressure plate 23, perforated steel plate 24, shear nails 25, through-steel bars 26, first concrete 27, concrete section 3, second concrete 31, steel strand 4, corrugated pipe 41, anchor 42.

[0019] Example

[0020] The embodiment is basically as shown in the attached Figure 1-4 As shown, Figure 2 The assembled steel-concrete composite beam shown in FIG. 1 comprises a steel beam section 1, a steel-concrete composite section 2 and a concrete section 3 which are fixedly connected in sequence. Figure 1 As shown, the steel beam section 1 includes a top plate 11, a bottom plate 12, two side plates 13 and a plurality of stiffening ribs, the top plate 11 is on the top and the bottom plate 12 is on the bottom, and the two side plates 13 are welded at intervals between the ends of the top plate 11 and the bottom plate 12, and then spliced ​​to form the steel beam section 1; the stiffening ribs are all T-shaped stiffening ribs 14, and a plurality of T-shaped stiffening ribs 14 are welded at intervals on the top plate 11, the bottom plate 12 and the side plates 13, respectively, to improve the strength of the internal structure of the steel beam section 1, and the T-shaped stiffening ribs 14 are all right-angled trapezoids, and after being fixed, the top edges of the T-shaped stiffening ribs 14 are all located away from the steel beam mixed section, and the oblique edges of all T-shaped stiffenings form a transition section, so as to achieve a smooth transition of stiffness between the steel beam section 1 and the concrete section 3. It should be noted that all the figures in this embodiment show the structure on the left side of the steel-concrete composite beam, and the structures on the left and right sides of the steel-concrete composite beam are completely consistent and symmetrical.

[0021] The steel-concrete joint section 2 includes two outer steel plates connected to each other, two inner steel plates 21, two outer side plates 13, two inner side plates 22, a plurality of perforated steel plates 24 and a pressure plate 23. Figure 2 As shown, two outer steel plates, one on top and one on the bottom, are connected to the top plate 11 and the bottom plate 12 of the steel beam section 1 respectively, and two inner steel plates 21 are located between the two outer steel plates; two outer side plates 13 are vertically fixed between the two ends of the two outer steel plates and connected to the two side plates 13 of the steel beam section 1, and two inner side plates 22 are vertically fixed between the two ends of the two inner steel plates 21, and as shown in FIG. Figure 3As shown, the pressure plate 23 is in a P shape, and the right side of the pressure plate 23 is fixed to the outer steel plate, the inner steel plate 21, the outer plate 13 and the inner plate 22, and then spliced ​​to form an overall P-shaped cell. The first concrete 27 is poured in the cell, and the first concrete 27 after casting is also in a P shape; the first concrete 27 and the pressure plate 23, the outer steel plate, the inner steel plate 21, the outer plate 13 and the inner plate 22 form a steel-concrete combined section 2. In addition, in this embodiment, the upper outer steel plate is integrally formed with the top plate 11 of the steel beam section 1, the lower outer steel plate is integrally formed with the bottom plate 12 of the steel beam section 1, and the two outer plates 13 are integrally formed with the two side plates 13 of the steel beam section 1, so as to ensure the strength and stability of the connection between the steel beam section 1 and the steel-concrete combined section 2, improve the structural strength of the steel-concrete structural beam, and meet the construction requirements of large-span hybrid bridges. At the same time, combined with Figure 1 As shown, the right sides of all T-shaped stiffening ribs 14 are welded and fixed to the left side of the pressure plate 23 , and the strength of the connection between the steel beam section 1 and the steel-concrete combined section 2 is further improved by the T-shaped stiffening ribs 14 .

[0022] like Figure 4As shown, a plurality of perforated steel plates 24 are fixed horizontally or vertically at intervals in the P-type cell, wherein the horizontally arranged perforated steel plates 24 are respectively fixed between the inner plate 22 and the outer plate 13, and the vertically arranged perforated steel plates 24 are respectively fixed between the inner steel plate 21 and the outer steel plate, thereby further dividing the P-type cell into a plurality of square sub-cells, and the sub-cell between the inner steel plate 21 and the outer steel plate is the first sub-cell, and the sub-cell between the inner plate 22 and the outer plate 13 is the second sub-cell. A plurality of first shear force components are arranged in each sub-cell, and the first shear force components include through steel bars 26 and shear nails 25. The through steel bars 26 and the shear nails 25 are distributed vertically and horizontally and crosswise with each other, and the through steel bars 26 and the shear nails 25 in the first sub-cell and the second sub-cell are arranged in opposite directions. For example, in this embodiment, the through steel plates in the first sub-cell are arranged horizontally and the shear nails 25 are arranged vertically, and the through steel plates in the second sub-cell are arranged vertically and the shear nails 25 are arranged horizontally, so that the stresses on both sides and in the middle of the steel-concrete combined section 2 are mutually dispersed, thereby improving the ability to prevent the first concrete 27 from cracking. The perforated steel plate 24 is provided with a plurality of through holes, and the through steel bars 26 pass through the perforated steel plate 24 to connect the adjacent sub-cells. Taking the first cell as an example, the through steel bars 26 pass through the perforated steel plate 24 horizontally, and the two ends are respectively welded and fixed on the outer plate 13 and the inner plate 22, and the shear nails 25 are respectively vertically fixed on the inner wall of the top plate 11 and the inner steel plate 21, thereby completing the setting of the first shear component. The first shear component improves the internal structural strength and shear resistance of the steel-concrete combined section 2 after casting, and further improves the internal strength of this steel-concrete combined beam to meet the construction requirements of large-span hybrid bridges. In this embodiment, the through steel bars 26 are PBL steel bars, and the first concrete 27 is high-strength concrete. The strength of the steel-concrete combined beam structure is further improved by selecting the structural strength of the material itself.

[0023] like Figure 2As shown, the right end of the steel-concrete combined section 2 is a concrete section 3, which includes a second concrete 31 and a second shear assembly. The structure of the second shear assembly is the same as that of the first shear assembly. The strength and shear resistance of the internal structure of the second concrete 31 are also improved by distributing a number of through steel bars and a number of shear nails in a horizontal, vertical and cross manner. In this embodiment, the second concrete 31 after casting is also P-shaped, and the second concrete 31 is coaxial with the first concrete 27 and has the same size. The first concrete 27 and the second concrete 31 are both P-shaped. With the hollow structure inside the P-shaped structure, the amount of concrete used can be reduced, which can save construction costs and reduce the weight of the steel-concrete combined beam, thereby ensuring smooth and safe construction. As mentioned above, the P-shaped structure on the left side makes the steel-concrete combined beam as a whole a double-sided box structure, and the box body is located on both sides of the combined beam. Since the top-pushing construction method is often used in bridge construction, the steel-concrete combined beam with a double-sided box structure can ensure the stability of movement during construction, thereby further ensuring the safety of construction.

[0024] The prestressed structure includes a corrugated pipe 41, a steel strand 4 and an anchor 42. The corrugated pipe 41 penetrates the first concrete 27 and the second concrete 31. The steel strand 4 is arranged in the corrugated pipe 41. Figure 3 As shown, the pressure plate 23 is provided with a plurality of connection holes, one end of the steel strand 4 passes through the connection hole and is fixed to the pressure plate 23 by the anchor 42, and the other end of the steel strand 4 extends to the outside of the second concrete 31; after the first concrete 27 and the second concrete 31 reach the specified strength, the steel strand 4 is tensioned. The steel strand 4 has a high strength and can effectively share the vertical load and horizontal load of the main beam. After tensioning, it forms a pre-stress, thereby enhancing the bearing capacity and stability of the structure, effectively reducing the deformation and cracking of the combined beam, and extending the service life of the bridge. The corrugated pipe 41 provides a tensioning channel for the tensioning construction of the steel strand 4.

[0025] The specific implementation process is as follows:

[0026] First, if Figure 1 As shown, the perforated steel plate 24 in the steel-concrete combined section 2 is welded and fixed between the inner steel plate 21 and the outer steel plate, between the inner side plate 22 and the outer side plate 13, the T-shaped stiffening ribs 14 are welded and fixed to the top plate 11, the bottom plate 12 and the side plate 13 at intervals, and the other ends of all the T-shaped stiffening ribs 14 are welded and fixed to the uniform pressure plate 23; then the shear nails 25 in the first shear assembly are welded and fixed to the outer steel plate, the inner steel plate 21, the outer side plate 13 and the inner side plate 22, and then the through steel bars 26 are passed through and fixed between the perforated steel plates 24 by binding and spot welding; then, the outer steel plate, the inner steel plate 21 and the pressure plate 23 are welded to complete the mold erection work of the inner formwork and the outer formwork respectively.

[0027] Next, the concrete section 3 and the steel-concrete combined section 2 are poured at one time. After the strength of the first concrete 27 and the second concrete 31 reaches more than 75% of the design strength, the formwork is removed and the molded specimens are cured for more than 28 days.

[0028] Before the installation of the steel-concrete composite beam, the support is reasonably set up according to the calculation to ensure that the support position and support settlement are within the allowable range. A large floating crane or beam transporter is used to transport the steel-concrete composite beam to the location, lift the steel-concrete composite beam onto the support, and reasonably select the lifting position to prevent its deformation or concrete cracks. Then the position of the steel-concrete composite beam is accurately located.

[0029] Finally, the steel strands 4 are bundled through the reserved prestressed corrugated pipes 41 of the steel-concrete combined section 2 and the concrete section 3 and the anchors 42 are installed. The steel strands 4 are tensioned according to the design requirements and then fixed with the anchors 42. The steel-concrete combined beam is connected to the adjacent beam ends by bolt connection or wet joints. This embodiment adopts wet joint connection. After the bridge deck is installed, the wet joint steel bars are tied and the formwork is erected. The wet joints in each unit are cast in sequence. Finally, the reserved transverse wet joints are cast to complete the installation construction of the steel-concrete combined beam as a bridge deck.

[0030] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An assembled steel-concrete composite beam, characterized in that: It includes a steel beam section, a steel-concrete combination section and a concrete section connected in sequence, and each of the steel beam section, the steel-concrete combination section and the concrete section is provided with two symmetrical sections; the steel beam section includes a top plate, a bottom plate, a side plate located between the top plate and the bottom plate, and a plurality of stiffening ribs connected to each other, and the stiffening ribs are distributed on the top plate, the bottom plate and the side plates; the steel-concrete combination section includes a cell composed of an outer steel plate, an inner steel plate, an outer plate, an inner plate and a pressure plate connected to each other, the cell is provided with a first concrete, and the cell and the first concrete are both P-type, and the first concrete is provided with a first shear component; the concrete section includes a second concrete, and the second concrete is also P-type.

2. The assembled steel-concrete composite beam according to claim 1, characterized in that: It also includes a prestressed structure, which includes a corrugated pipe and a steel strand. The corrugated pipe runs through the first concrete and the second concrete. The steel strand is arranged in the corrugated pipe. One end of the steel strand is fixed to the pressure plate, and the other end of the steel strand extends out of the second concrete.

3. The assembled steel-concrete composite beam according to claim 2 is characterized in that: The first shear force component includes a plurality of through-steel bars and a plurality of shear force nails, and the plurality of through-steel bars and the plurality of shear force nails are distributed crosswise with each other.

4. The assembled steel-concrete composite beam according to claim 3 is characterized in that: The steel-concrete combined section also includes a porous steel plate, which divides the cell into a plurality of first sub-cells and a plurality of second sub-cells. The first sub-cells and the second sub-cells are both provided with first shear components, and the through steel bars and shear nails in the first sub-cells and the second sub-cells are arranged in opposite directions.

5. The assembled steel-concrete composite beam according to claim 1, characterized in that: The stiffening ribs are all T-shaped stiffening ribs, and the T-shaped stiffening ribs are all connected to the pressure plate.

6. The assembled steel-concrete composite beam according to claim 1, characterized in that: A second shear force component is arranged in the second concrete, and the second shear force component also comprises a plurality of through steel bars and a plurality of shear force nails which are cross-distributed in the horizontal and vertical directions.

Images