Steel-concrete composite beam and bridge based on planar double-Y-shaped MCL type composite pin type steel

Abstract

The invention discloses a steel-concrete composite beam and a bridge based on plane double-Y-shaped MCL type composite pin section steel, and belongs to the technical field of structural engineering. The steel-concrete composite beam comprises a steel beam and a concrete beam plate arranged at the top of the steel beam, a middle beam in the steel beam and two pairs of edge beams at the two ends of the middle beam are correspondingly arranged, and web plates and bottom plates in all beam sections are correspondingly arranged; and the planar double-Y-shaped MCL-shaped composite pin section steel is obtained through corresponding arrangement of the concrete beam plate and the MCL-shaped composite pin structure on the top of the web plate, and then the steel-concrete composite beam formed by combining the concrete beam plate and the planar double-Y-shaped MCL-shaped composite pin section steel is obtained. The steel-concrete composite beam based on the plane double-Y-shaped MCL type composite pin type steel is simple in structure and convenient to manufacture, the shear bearing capacity of the two ends of the steel-concrete composite beam can be greatly improved, the stability and reliability of arrangement and use of the steel-concrete composite beam are guaranteed, the service life of the steel-concrete composite beam is prolonged, and the service life of the steel-concrete composite beam is prolonged. And the economical efficiency and the safety of the steel-concrete composite beam in use are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural engineering, and particularly relates to a steel-concrete composite beam and a bridge based on a planar double-Y-shaped MCL-type composite pin steel section. Background Art

[0002] In-situ casting construction of reinforced concrete is a relatively common construction method in engineering construction and has wide applications in the field of building engineering. However, a large amount of carbon emissions are usually generated during the in-situ casting construction of reinforced concrete, and the control of project quality is relatively difficult. Moreover, the demolition process after the project reaches its service life will further exacerbate carbon emissions. Therefore, how to effectively reduce carbon emissions in the field of building engineering has become the key focus of researchers.

[0003] Considering the above problems existing in in-situ casting construction, the advantages of steel-concrete composite structures have gradually emerged. In addition to having the advantage of good project quality, it is also convenient to realize the prefabricated construction of the project and has increasingly become one of the main structural forms adopted in building engineering.

[0004] In steel-concrete composite structures, shear connectors are often the key to controlling the coordinated force of steel and concrete materials. How to set shear connectors with strong structural stability in steel-concrete composite structures has become a key technical issue that researchers focus on. Currently, compared with traditional shear connectors such as stud bolts, MCL-type composite pin shear connectors have shown greater performance advantages. The steel-concrete composite beam based on the MCL-type composite pin steel section is not only simple in construction but also has high load-bearing capacity. However, the steel-concrete composite beam based on the MCL-type composite pin still has slightly poor construction stability. Especially after the hoisting of the first main beam, additional stability enhancement measures are required, and there are deficiencies such as weak shear bearing capacity in the bending-shear section at the end of the composite beam, which restricts the wide application of steel-concrete composite structures to a certain extent. Summary of the Invention

[0005] In view of one or more of the above defects or improvement requirements in the prior art, the present invention provides a steel-concrete composite beam and a bridge based on a planar double-Y-shaped MCL-type composite pin steel section, which can effectively improve the structural stability and shear bearing capacity after the composite beam is set and extend the service life of the steel-concrete composite beam.

[0006] To achieve the above object, in one aspect of the present invention, there is provided a steel-concrete composite beam based on a planar double-Y-shaped MCL-type composite pin steel section, which includes a steel beam and a concrete slab provided on the top of the steel beam; The steel beam includes a middle beam extending along a first direction and two pairs of side beams respectively provided at both ends of the middle beam; the central axes of the middle beam and each side beam are located in the same plane, and each pair of side beams includes a first side beam and a second side beam that form a certain angle with the first direction, and a planar Y-shaped structure is respectively formed at both ends of the middle beam; The center beam and each of the side beams include a bottom plate and a web; the web is perpendicular to the plate surface of the bottom plate, one side of the web is connected to one side of the plate surface of the bottom plate, and the other side of the web is provided with a plurality of composite pin holes spaced apart along the extension direction of the plate body, and an MCL type composite pin structure with a plurality of steel pins is formed on the side of the web away from the bottom plate; The composite pin hole at the top of the first side beam is aligned with the composite pin hole at the top of the second side beam in a second direction, wherein the second direction is perpendicular to the first direction; transverse steel bars extending along the second direction are embedded in the composite pin holes facing each other in the second direction of each pair of side beams and in the composite pin holes at the top of the middle beam; and each of the steel pins and each of the transverse steel bars are embedded in a concrete beam slab made of high-performance concrete.

[0007] As a further improvement of the present invention, the length of each of the side beams meets the following requirements:

[0008] In the formula, L 1 is the length of the edge beam; L is the full length of the steel-concrete composite beam; θ is the angle between the edge beam axis and the first direction.

[0009] By constructing the above-mentioned relationship between the length of the side beam and the total length of the steel-concrete composite beam and the bending angle of the side beam, the setting area of the side beam can be fully included in the area of the beam body with greater shear force, ensuring that both ends of the steel-concrete composite beam have sufficient shear bearing capacity while reducing the setting length of the side beam, effectively saving steel while ensuring the setting strength, and reducing the application cost of the steel-concrete composite beam.

[0010] As a further improvement of the present invention, the height of the concrete beam slab meets the following requirements:

[0011] In the formula, h 2 is the height of the concrete beam and slab; is the compressive strength of concrete; b is the effective width of the concrete beam-slab; a is the effective height of the concrete compressive stress block; A s is the cross-sectional area of the steel beam; is the yield strength of steel; is the concrete compressive stress block coefficient; H is the total height of the steel-concrete composite beam; h 1 is the height of the steel pin; is the thickness of the concrete cover; is the height of the steel beam itself.

[0012] Through the design of the height (thickness) of the concrete beam slab, the concrete beam slab can fully meet the stress requirements and construction requirements, fully ensure the reliability of the connection between the steel beam and the concrete beam slab, realize the rapid design of the concrete beam slab, ensure the setting requirements of the concrete beam slab, while reducing the application of concrete materials as much as possible, reducing the self-weight of the steel-concrete composite beam, and saving the manufacturing cost of the steel-concrete composite beam.

[0013] As a further improvement of the present invention, the included angle between each of the side beams and the first direction is 5° to 10°.

[0014] Through the design of the bending angle of the side beam, the design of the side beam can better meet the requirements of the anti-overturning degree of the beam body and adapt to the structure of the pier cap beam.

[0015] As a further improvement of the present invention, the steel beam is obtained by cutting out MCL-type composite pins on the web of an I-beam or a T-beam steel.

[0016] By adopting the method of cutting an I-beam or a T-beam steel to prepare the steel beam, the preparation process of the steel beam is simplified, the structural integrity between the structures (web and bottom plate, side beam and middle beam) in the steel beam is improved, the generation of welding parts is reduced, the overall stress performance of the steel beam is improved, and the manufacturing cost of the planar double-Y-shaped MCL-type composite pin steel is reduced.

[0017] As a further improvement of the present invention, the lengths of the first side beam and the second side beam are equal; and / or The included angle between the axis of the first side beam and the first direction is equal to the included angle between the axis of the second side beam and the first direction.

[0018] Through the optimized setting of the length of the side beam and the bending angle of the side beam, the steel beam can have a certain symmetry in the transverse and longitudinal directions, thereby improving the balance and reliability of the load-bearing and force transmission of each part of the steel beam.

[0019] As a further improvement of the present invention, the two first side beams and the middle beam are respectively obtained by bending both ends of a straight steel in a plane, and one end of the second side beam is welded to the bending part of the middle beam and the corresponding first side beam.

[0020] As a further improvement of the present invention, the width of the steel-concrete composite beam is 1.5 to 3.0 m; and / or The width of the concrete beam slab in the second direction is 2 to 5 times the maximum value of the distance between the first side beam and the second side beam.

[0021] By optimally setting the lateral dimension between the concrete beam-slab and the steel beam, the structural defects caused by excessive lateral cantilever of the concrete beam-slab can be effectively avoided, and the force stability after the setting of the steel-concrete composite beam structure can be fully ensured.

[0022] In another aspect of the present invention, there is also provided a bridge, which includes a plurality of the steel-concrete composite beams based on the planar double-Y-shaped MCL-type composite pin steel; and The bridge further includes pier cap beams for supporting both ends of each of the steel-concrete composite beams; the bottoms of the two side beams at both ends of each of the steel-concrete composite beams are respectively supported on the pier cap beams by bearings.

[0023] As a further improvement of the present invention, the bridge includes a plurality of steel-concrete composite beams arranged side by side in the transverse direction; and The two concrete beam-slabs in two adjacent steel-concrete composite beams are connected to each other; and / or, the two steel beams in two adjacent steel-concrete composite beams are connected to each other by connecting steel beams.

[0024] By connecting the adjacent concrete beam-slabs and the adjacent steel beams with corresponding connecting members, a unified force-bearing body can be formed among the plurality of steel-concrete composite beams, further ensuring the balance and reliability of the force-bearing and transmission of the bridge beam body.

[0025] As long as the above-mentioned improved technical features do not conflict with each other, they can be combined with each other.

[0026] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include: (1) For the steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel in the present invention, its structure is simple and the preparation is convenient. By using the corresponding design of the planar double-Y-shaped MCL-type composite pin steel and combining with the special design of the bending length, angle of the side beams at both ends of the steel beam and the thickness of the concrete beam-slab, the shear bearing capacity at both ends of the steel-concrete composite beam can be greatly improved, thereby ensuring the stability and reliability of the setting and use of the steel-concrete composite beam, prolonging the service life of the steel-concrete composite beam, and improving the economy and safety of the use of the steel-concrete composite beam.

[0027] (2) For the bridge in the present invention, by using the corresponding setting of the steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel on the pier cap beam and combining with the combined setting and connection among the steel-concrete composite beams, the shear bearing capacity of the bridge can be fully ensured, the stability and reliability after the setting of the bridge can be improved, the service life of the bridge can be prolonged, and the application and maintenance costs of the bridge project can be reduced. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the accompanying drawings required for the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 is a three-dimensional structural schematic diagram of the steel-concrete composite beam in the embodiment of the present invention; Figure 2 is a structural perspective view of the steel-concrete composite beam from a top-down view in the embodiment of the present invention; Figure 3 is a longitudinal sectional view of the steel-concrete composite beam in the embodiment of the present invention; Figure 4 is a side view of the profiled steel of the steel-concrete composite beam in the embodiment of the present invention; Figure 5 is a top view of the profiled steel of the steel-concrete composite beam with the bottom plate omitted in the embodiment of the present invention; In all the accompanying drawings, the same reference numerals represent the same technical features, specifically: 1. Steel beam; 101. Web; 102. Bottom plate; 103. Steel pin; 104. Composite pin hole; 105. Middle beam; 106. First side beam; 107. Second side beam; 2. Concrete beam slab; 3. Transverse steel bar. Detailed implementation manners

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further details the present invention in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] In the description of the present invention, it should be understood that unless otherwise clearly defined and limited, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is 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 should not be construed as a limitation to the present invention.

[0032] In addition, unless otherwise clearly defined, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Below, reference Figures 1 to 5 A steel-concrete composite beam based on a plane double Y-shaped MCL type composite pin steel in a preferred embodiment of the present invention is described.

[0036] Specifically, if Figure 1 As shown in the figure, the steel-concrete composite beam in the preferred embodiment includes a steel beam 1 and a concrete beam slab 2 arranged on the top of the steel beam 1. The top of the steel beam 1 is embedded in the bottom of the cast concrete beam slab 2, and the two form an integral structure with uniform force.

[0037] In more detail, the concrete beam-slab 2 in the preferred embodiment is cast by high-performance concrete, and the steel beam 1 in the preferred embodiment includes a web 101 and a bottom plate 102 located on the side away from the concrete beam-slab 2, the web 101 and the plate surface of the bottom plate 102 are arranged perpendicularly, and one side of the web 101 is connected to the middle part of the bottom plate 102, forming a bottom steel beam 1 with an "inverted T-shaped" cross-section.

[0038] Meanwhile, the extending direction of the concrete beam slab 2 (the longitudinal direction of the steel-concrete composite beam) is referred to as the first direction. In a preferred embodiment, the steel beam 1 includes a middle beam 105 located in the middle and extending along the first direction and two pairs of side beams disposed at both ends of the middle beam 105.

[0039] The two pairs of side beams are preferably symmetrically arranged about the center of the middle beam 105 ; more preferably, the two end beam bodies in each pair of side beams are respectively symmetrically arranged about the axis of the middle beam 105 .

[0040] In more detail, each pair of side beams includes a first side beam 106 and a second side beam 107, and the axes of the two side beams form a certain angle θ with the axis of the middle beam 105, that is, an angle of 2θ is formed between each pair of side beams. Figure 5 as shown in .

[0041] In actual configuration, the two first side beams 106 are preferably obtained by bending the two ends of a single beam body at an angle θ, that is, the two first side beams 106 and the middle beam 105 are an integral structure. At the same time, the two second side beams 107 are preferably formed by connecting (for example, welding) beam sections of a certain length at the bending positions at the two ends of the single beam body (the connection positions of the first side beams 106 and the middle beam 105).

[0042] In a preferred embodiment, the cross-sectional form (including the web 101 and the bottom plate 102 ) and the length of the second side beam 107 are the same as those of the first side beam 106 , and the axes of the beams are arranged in the same plane.

[0043] By arranging side beams in pairs at both ends of the steel beam 1, a "Y-shaped" structure is formed at both ends of the steel beam 1, thereby forming a planar double Y-shaped beam body.

[0044] Further, for the steel beam 1 in the preferred embodiment, a plurality of compound pin holes 104 are spaced apart at the top of the web 101 (the side away from the bottom plate 102), forming a plurality of steel pins 103, and finally forming a continuous MCL type compound pin at the top of the steel beam 1, so as to obtain Figure 4 The flat double Y-shaped MCL type composite pin steel shown in.

[0045] At the same time, the composite pin hole 104 at the top of the first side beam 106 is aligned with the composite pin hole 104 at the top of the second side beam 107 in the transverse direction (a second direction perpendicular to the first direction) of the steel beam 1, so that the transverse steel bars 3 at both ends of the subsequent composite beam structure can be simultaneously embedded in the composite pin holes 104 at the top of the two side beams and extend in the transverse direction.

[0046] In actual configuration, each composite pin hole 104 is embedded with a plurality of transverse steel bars 3 extending in the transverse direction. Figures 1 to 3As shown. At the same time, during actual installation, the MCL composite pins on the top of the steel beam 1 and the transverse steel bars 3 embedded in each composite pin hole 104 are all embedded in the concrete beam slab 2, and the thickness of the concrete beam slab 2 h 2 is greater than the height of the steel pin 103 h 1 (i.e., the groove depth of the composite pin hole 104).

[0047] More specifically, in the preferred embodiment, the height of the concrete beam slab 2 h 2 is preferably determined comprehensively through mechanical analysis and structural requirements to ensure that the neutral axis of the steel beam 1 is located within the concrete beam slab 2, and the steel pin 103 is completely buried in the concrete beam slab 2 and covers a sufficient height of the web 101 of the steel beam 1 to improve the shear resistance of the beam body.

[0048] Specifically, the derivation process of the height of the concrete beam slab 2 h 2 is preferably as follows: (1) Design according to force requirements First, determine the position of the neutral axis of the composite beam structure under bending action; Assume that the composite beam bears a bending moment M. At this time, the concrete beam slab 2 is in compression and the steel beam 1 is in tension. According to the equilibrium condition, the resultant force of the concrete compressive stress is equal to the resultant force of the steel tensile stress: (1) In the formula, is the concrete compressive strength; b is the effective width of the concrete beam slab 2; a is the effective height of the concrete compressive stress block; A s is the cross-sectional area of the steel beam 1; is the yield strength of the steel.

[0049] Based on formula (1), it can be obtained that: (2) Furthermore, the position depth of the central axis is where, is the concrete compressive stress block coefficient, and its value is further preferably 0.85. In this way, the position of the neutral axis of the composite beam structure under bending action can be determined.

[0050] Secondly, determine the minimum height (thickness) of the concrete beam slab 2 of the composite beam structure h 2; Specifically, to ensure that the neutral axis is located within the concrete beam slab 2, the height of the concrete beam slab 2 h 2 needs to satisfy: (3) In the formula, is the thickness of the concrete cover; in actual design, Usually 30 to 50 mm is used.

[0051] In addition, the synergistic effect between the steel beam 1 and the concrete beam-slab 2 in the composite beam structure is determined; Specifically, the total height of the composite beam structure H And steel pin 103 height h 1 affects the combined section inertia moment of the composite beam structure. At the same time, the distance between the centroid of the steel beam 1 and the top surface of the concrete beam slab 2 is: (4) In the formula, is the height of steel beam 1 itself.

[0052] At the same time, the bending bearing capacity of the composite section must meet the following requirements: (5) By combining the above formulas (4) and (5), the height of the concrete beam slab 2 can be obtained: h 2Should meet the following requirements: (6) (2) Design of structural requirements First, the coverage requirements of the steel pin 103 are designed: In actual setting, the height area of the steel pin 103 needs to be completely buried in the concrete and leave enough protective layer, that is, it needs to meet the following requirements: (7) At the same time, the connection between the concrete beam slab 2 and the web 101 of the steel beam 1 should ensure that the shear resistance requirement is met. At this time, the covering height between the concrete beam slab 2 and the web 101 of the steel beam 1 should meet the following requirements: and (8) In summary, combined with the design of force requirements and structural requirements, the height of the concrete beam slab 2 h 2. Must meet the following requirements: (9) Furthermore, in addition to designing the height of the concrete beam slab 2, in actual setting, it is also necessary to design the location and length of the two pairs of side beams at both ends of the steel beam 1. At this time, the length of the steel-concrete composite beam L Divided into lengths corresponding to the center beam 105 L 2 and the two lengths of the corresponding side beams at both ends L 1. Such as Figures 3 to 5 As shown in . That is: (10) in, LThe derivation process of 1 and L 2 is as follows: First, under the uniformly distributed load q acting, the shear force equation of the simply supported beam is: (11) In the formula, x is the distance of the calculated section from the support. When x = 0 (i.e., the calculated section is the support section), ; when x = L / 2 (i.e., the calculated section is the mid-span section), .

[0053] Secondly, set the shear force threshold, and define the boundary of the region with larger shear force as , where k is the threshold coefficient, which can usually be taken by experience, and is further preferably taken as 0.5 - 0.6. Combining with equation (11), we can get: (12) Therefore, the distance of the section in the region with larger shear force from the support is .

[0054] Finally, perform the ratio calculation in combination with the length L of the composite beam structure, and obtain: (13) According to engineering experience, k is usually taken as 0.5 - 0.6. Correspondingly, the ratio of the axial length of the side beam to the overall length of the composite beam is: (14) Therefore, the region with larger shear force accounts for about 20% - 25% of the span of the composite beam body.

[0055] In addition, considering that the first side beam 106 is bent at a certain angle in the plane with respect to the extension direction of the steel beam 1 during actual installation θ , so the actual lengths of the first side beam 106 and the second side beam 107 are: (15) Further preferably, the steel beam 1 in the preferred embodiment is made by cutting a section steel, such as an I-beam or a T-beam, that is, an MCL-type composite pin is cut on the web 101 of the section steel along the longitudinal direction of the steel beam 1 by laser or other cutting methods.

[0056] More specifically, in the preferred embodiment, the angle between the two side beams at both ends of the composite beam structure can be determined according to the anti-overturning degree of the beam body and the structure of the pier cap beam, and this angle is further preferably 10° to 20°, that is, the offset angle of a single side beam relative to the axis direction of the composite beam structure. θ is 5° to 10°.

[0057] In addition, during actual installation, the steel beam 1 is preferably arranged in the middle of the bottom surface of the concrete beam slab 2, and the width of the concrete beam slab 2 in the transverse direction is preferably 2 to 5 times the maximum distance between the first side beam 106 and the second side beam 107.

[0058] By using the combined setting of the side beams at both ends of the steel-concrete composite beam, a "Y-shaped" or "V-shaped" steel beam support system can be formed in the areas with large shear forces at both ends of the composite beam structure, thereby ensuring the structural stability and reliability during the actual support of the steel-concrete composite beam. During specific installation, the ends with the largest distance between the first side beam 106 and the second side beam 107 are respectively supported on the pier cap beam through bearings to ensure the shear resistance bearing capacity at the ends of the composite beam structure.

[0059] Further preferably, the preparation process of the steel-concrete composite beam in the preferred embodiment can be further carried out with reference to the following process: (1) Prepare a planar double-Y-shaped MCL-type composite pin steel beam; First, select appropriate steel sections for preparation. For example, select I-beams or T-beams with corresponding size specifications, and at a certain height within the range of the web 101, cut out MCL-type composite pins along the length direction of the steel section using laser or other cutting methods to obtain a straight steel beam with MCL-type composite pins.

[0060] Secondly, determine the bending positions of the two first side beams 106 at both ends of the straight steel beam. The specific bending positions can be determined with reference to the aforementioned formula (15), and the bending angle is preferably 5° to 10°; at the same time, select two second side beams 107 corresponding to the size parameters (including length, height, MCL-type composite pin structure, etc.) of the first side beam 106 according to the bent lengths at both ends of the straight steel beam.

[0061] Finally, weld one end of the two second side beams 107 at the junction of the middle beam 105 and the first side beam 106, so that the second side beam 107 is axisymmetric with the first side beam 106 and the middle beam 105, and the axes of each side beam and the middle beam 105 are in the same horizontal plane, thereby obtaining a planar double-Y-shaped MCL-type composite pin steel beam, that is, obtaining the steel beam 1 for supporting the concrete beam slab 2.

[0062] (2) Horizontally arrange transverse steel bars 3 in the transverse composite pin holes 104 at the top of the steel beam 1 and correspondingly arrange other steel bars required in the concrete beam slab 2; (3) Pour and form the concrete beam-slab 2 on the top of the steel beam 1 using high-performance concrete, so that the MCL-type composite pins at the top of the web 101, each transverse reinforcement 3, and other reinforcements are buried inside the concrete beam-slab 2 together. When setting the concrete beam-slab 2, its setting height is determined with reference to the foregoing formula (9), and finally a steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel is obtained.

[0063] As another aspect of the present invention, a bridge based on the foregoing steel-concrete composite beam is also proposed. The bridge includes a plurality of steel-concrete composite beams and pier cap beams for supporting both ends of each steel-concrete composite beam, and the bottoms of the two side beams at both ends of each steel-concrete composite beam are respectively supported and arranged on the pier cap beams through bearings.

[0064] In addition, during actual setting, the width of a single steel-concrete composite beam in the preferred embodiment is 1.5 - 3.0 m. Usually, multiple steel-concrete composite beams need to be arranged in parallel in the transverse direction at the actual layout position. For example, in a specific setting scenario, the width of the bridge is 12 m. At this time, 4 - 8 of the foregoing steel-concrete composite beams are arranged in the transverse direction.

[0065] For the case where multiple steel-concrete composite beams are arranged in parallel, it is preferred to directly set a connecting beam between adjacent steel-concrete composite beams, and connect the steel beams 1 of the two steel-concrete composite beams through a connecting steel beam extending in the transverse direction. And / or, connect the concrete beam-slabs 2 of adjacent two steel-concrete composite beams into one body by setting connecting pieces.

[0066] Of course, in addition to applying the foregoing steel-concrete composite beam in the field of bridges, the steel-concrete composite beam in the preferred embodiment can also be applied in other application scenarios as needed, such as the field of building construction, the field of road construction, the field of platform square construction, etc., which will not be elaborated here.

[0067] The steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel in the present invention has a simple structure and is convenient to prepare. By using the corresponding design of the planar double-Y-shaped MCL-type composite pin steel and cooperating with the special designs of the bending length, angle of the side beams at both ends of the steel beam, and the thickness of the concrete beam-slab, the shear bearing capacity at both ends of the steel-concrete composite beam can be greatly improved, thereby ensuring the stability and reliability of the setting and use of the steel-concrete composite beam, extending the service life of the steel-concrete composite beam, and enhancing the economy and safety of the use of the steel-concrete composite beam.

[0068] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel-concrete composite beam based on a planar double-Y-shaped MCL-type composite pin steel, characterized in that, It includes a steel beam and a concrete beam slab arranged on the top of the steel beam; The steel beam comprises a middle beam extending along a first direction and two pairs of side beams disposed at both ends of the middle beam; the middle beam and the central axis of each of the side beams are located in the same plane, and each pair of side beams comprises a first side beam and a second side beam which are mutually angled with the first direction, and a planar Y-shaped structure is formed at both ends of the middle beam; The center beam and each of the side beams include a bottom plate and a web; the web is perpendicular to the plate surface of the bottom plate, one side of the web is connected to one side of the plate surface of the bottom plate, and the other side of the web is provided with a plurality of composite pin holes spaced apart along the extension direction of the plate body, and an MCL type composite pin structure with a plurality of steel pins is formed on the side of the web away from the bottom plate; The composite pin hole at the top of the first side beam is aligned with the composite pin hole at the top of the second side beam in a second direction, wherein the second direction is perpendicular to the first direction; transverse steel bars extending along the second direction are embedded in the composite pin holes facing each other in the second direction of each pair of side beams and in the composite pin holes at the top of the middle beam; and each of the steel pins and each of the transverse steel bars are embedded in a concrete beam slab made of high-performance concrete.

2. The steel-concrete composite beam based on the planar double-Y-shaped MCL type composite pin steel as claimed in claim 1, wherein The length of each side beam meets the following requirements: In the formula, L 1 is the length of the side beam; L is the total length of the steel-concrete composite beam; θ is the included angle between the axis of the side beam and the first direction.

3. The steel-concrete composite beam based on the planar double-Y-shaped MCL type composite pin steel as claimed in claim 1 or 2, characterized in that The height of the concrete beam slab meets the following requirements: In the formula, h 2 is the height of the concrete beam and slab; is the concrete compressive strength; b is the effective width of the concrete beam and slab; a is the effective height of the concrete compression stress block; A s is the cross-sectional area of the steel beam; is the yield strength of the steel; is the concrete compression stress block coefficient; H is the total height of the steel-concrete composite beam; h 1 is the height of the steel pin; is the thickness of the concrete protective layer; is the self-height of the steel beam.

4. The steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel as claimed in claim 1, characterized in that, The angle between each of the side beams and the first direction is 5°~10°.

5. The steel-concrete composite beam based on the planar double-Y-shaped MCL-type composite pin steel as claimed in claim 1 or 2 or 4, characterized in that, The steel beam is manufactured by cutting an MCL type composite pin on the web of an I-beam or a T-beam.

6. The steel-concrete composite beam based on the planar double-Y-shaped MCL type composite pin steel as claimed in claim 1 or 2 or 4, characterized in that, The first side beam and the second side beam have the same length; and / or The angle between the first side beam axis and the first direction is equal to the angle between the second side beam axis and the first direction.

7. The steel-concrete composite beam based on the planar double-Y-shaped MCL type composite pin steel as claimed in claim 1 or 2 or 4, characterized in that, The first side beams and the center beam are respectively made by bending both ends of straight steel in a plane, and one end of the second side beam is welded to the bending position between the center beam and the corresponding first side beam.

8. The steel-concrete composite beam based on the planar double-Y-shaped MCL type composite pin steel described in claim 1 or 2 or 4, characterized in that, The width of the steel-concrete composite beam is 1.5-3.0m; and / or The width of the concrete beam slab in the second direction is 2 to 5 times the maximum value of the distance between the first side beam and the second side beam.

9. A bridge, characterized in that, Comprising a plurality of steel-concrete composite beams based on a plane double Y-shaped MCL type composite pin steel as described in any one of claims 1 to 8; and The bridge also includes a pier cap beam for supporting the two ends of each of the steel-concrete composite beams; the bottoms of the two side beams at the two ends of each of the steel-concrete composite beams are respectively supported on the pier cap beams by bearings.

10. The bridge according to claim 9, characterized in that, The bridge comprises a plurality of steel-concrete composite beams arranged side by side in the transverse direction; and The two concrete beam-slabs in two adjacent steel-concrete composite beams are connected to each other; and / or, the two steel beams in two adjacent steel-concrete composite beams are connected to each other via a connecting steel beam.

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