A T-beam with a corrugated steel plate wrapped around the web

Abstract

The present invention discloses a T-beam with corrugated steel plates wrapped around the web, which relates to the field of bridge engineering. The purpose of the present invention is to provide a new type of T-beam that can simultaneously solve the problems of flexural and shear cracking of reinforced concrete T-beams, is convenient for construction, and has good mechanical properties. The technical solution adopted to achieve the purpose of the present invention is as follows: A T-beam with corrugated steel plates wrapped around the web includes a steel-concrete composite web and a concrete top plate. The steel-concrete composite web includes corrugated steel plates, a steel bottom plate, and a number of steel shear-resistant members. The two corrugated steel plates and the steel bottom plate are welded to form a steel trough with a U-shaped cross-section. A number of prestressed steel bars are inserted into the steel trough, and concrete is poured inside the steel trough. Inner flanges are provided at the upper edges of the two corrugated steel plates. The present invention solves the problem that the flat steel plate wrapped outside is prone to buckling under the action of prestress by applying corrugated steel plates. The convex and concave structure of the corrugated steel plates can also increase the frictional resistance between the corrugated steel plates and the concrete contact surface, improving the overall performance of the T-beam.

Description

Technical Field

[0001] The present invention relates to the field of bridge engineering, and particularly to a T-beam with corrugated steel plates wrapped around the web Background Art

[0002] In the field of bridge engineering, prestressed concrete T-beams are widely used due to their low technical threshold, convenient processing and low cost

[0003] The span, beam width and beam height of the main beam used in bridge structures are all larger than those of the main beam used in ordinary building structures. This characteristic results in relatively large bending moments and shear forces caused by the self-weight of the bridge main beam. At the same time, the bridge main beam also needs to bear the action of moving vehicles and pedestrian loads on the bridge deck. The tensile stress at the lower edge of the mid-span area of the main beam and the shear stress level near the supports are both relatively high

[0004] As is well known, concrete is a material with excellent compressive performance and poor tensile performance. By setting longitudinal prestress in a reinforced concrete T-beam to form a prestressed concrete T-beam, the problem of easy cracking in the tensile area of the main beam can be solved through reasonable design, but the problem of shear cracking that may occur due to the high shear stress level near the supports cannot be solved

[0005] In order to solve the problems of bending and shear cracking of reinforced concrete beams simultaneously, "concrete-filled steel plate beams" have been proposed. This structure wraps a thin steel plate on both sides and the lower edge of an ordinary reinforced concrete beam, and uses the high tensile strength of the steel plate to solve the problems of bending and shear cracking of the concrete beam. However, for a reinforced concrete beam with longitudinal prestress, due to the large elastic modulus of the steel plate, the pressure borne by the wrapped steel plate in the cross-section of the concrete-filled steel plate beam is relatively large, and the steel plate is prone to buckling failure when compressed. Therefore, the concrete-filled steel plate beam cannot be applied to a reinforced concrete beam with longitudinal prestress

[0006] Therefore, it is necessary to invent a new type of T-beam structure that can solve the cracking problem of prestressed concrete T-beams Summary of the Invention

[0007] The purpose of the present invention is to provide a new type of T-beam structure that can solve the cracking problem of prestressed concrete T-beams, is convenient for construction, and has good mechanical properties

[0008] The technical solution adopted to achieve the purpose of the present invention is as follows: a T-beam with corrugated steel plates wrapped around the web, including a steel-concrete composite web and a concrete top plate, and the steel-concrete composite web is vertically connected to the lower plate surface of the concrete top plate

[0009] The steel-concrete composite web includes corrugated steel plates, steel bottom plates, steel wing plates and a number of steel shear-resistant members, as well as the internally filled concrete

[0010] The steel bottom plate is a horizontally arranged rectangular steel plate, and two corrugated steel plates are vertically welded to the upper surface of the steel bottom plate. The wavelength direction of the corrugated steel plate is parallel to the horizontal plane.

[0011] The two side edges of the steel bottom plate along its length direction are respectively denoted as edge A and edge B, and the two corrugated steel plates are respectively close to edge A and edge B of the steel bottom plate.

[0012] The upper edge of each corrugated steel plate is vertically welded with a steel flange, and the two steel flanges form an inward curling edge.

[0013] The space enclosed by the corrugated steel plate, the steel bottom plate and the steel flange is denoted as cavity S, and a number of prestressed steel bars are arranged into cavity S along the length direction of the steel bottom plate. The concrete is filled in cavity S.

[0014] A number of profiled steel shear connectors are evenly welded to the upper surfaces of the two steel flanges, and the two ends of each profiled steel shear connector are respectively welded to the two steel flanges.

[0015] Furthermore, the cross-section of the profiled steel shear connector is in an I shape. The profiled steel shear connector includes an upper flange, a lower flange and a middle web, and the lower flange of the profiled steel shear connector is simultaneously welded to the two steel flanges.

[0016] Furthermore, from the mid-span position to the support position of the steel-concrete composite web, the distance between each prestressed steel bar and the steel bottom plate gradually increases.

[0017] Furthermore, a number of layers of steel mesh are arranged inside the concrete top plate.

[0018] The technical effect of the present invention is beyond doubt. The present invention utilizes the "spring effect" of the corrugated steel plate when it is axially stressed, solves the problem that the flat steel plate wrapped outside is prone to buckling under the action of prestress, ensures that most of the prestress can be applied to the internal filled concrete of the steel-concrete composite web, and greatly improves the use efficiency of prestress. At the same time, the convex-concave structure of the corrugated steel plate increases the frictional resistance between the corrugated steel plate and the internal filled concrete contact surface, thereby improving the overall performance of the T beam. In addition, the T beam structure of the present invention has a variety of construction methods, is applicable to various construction environments, and effectively reduces the construction cost. Description of the Drawings

[0019] Figure 1 Schematic diagram of a prestressed concrete T beam with a corrugated steel plate wrapped outside the web;

[0020] Figure 2 Schematic diagram of a steel beam wrapped outside the web and prestressed steel bundles;

[0021] Figure 3 Partial schematic diagram of a prestressed concrete T beam with a corrugated steel plate wrapped outside the web.

[0022] In the figure: steel-concrete composite web 1, corrugated steel plate 101, steel bottom plate 102, steel flange 103, profiled steel shear member 104, prestressed reinforcement 105, concrete top plate 2 and steel mesh 201. Detailed implementation mode

[0023] The present invention will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter scope of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, various substitutions and changes made according to common general knowledge and conventional means in the art should be included within the protection scope of the present invention.

[0024] Embodiment 1:

[0025] This embodiment discloses a T-beam with a corrugated steel plate wrapped outside the web, including a steel-concrete composite web 1 and a concrete top plate 2. Refer to Figure 1 , the steel-concrete composite web 1 is vertically connected to the lower plate surface of the concrete top plate 2. Refer to Figure 3 , a plurality of layers of steel meshes 201 are arranged inside the concrete top plate 2.

[0026] Refer to Figure 2 , the steel-concrete composite web 1 includes a corrugated steel plate 101, a steel bottom plate 102, steel flanges 103 and a plurality of profiled steel shear members 104, and the internally filled concrete.

[0027] The steel bottom plate 102 is a horizontally arranged rectangular steel plate, and two corrugated steel plates 101 are vertically welded to the upper surface of the steel bottom plate 102, and the wavelength direction of the corrugated steel plate 101 is parallel to the horizontal plane.

[0028] The two side edges of the steel bottom plate 102 along its length direction are respectively denoted as edge A and edge B, and the two corrugated steel plates 101 are respectively close to edge A and edge B of the steel bottom plate 102.

[0029] The upper edge of each corrugated steel plate 101 is vertically welded with a steel flange 103, and the two steel flanges 103 form an inward curling edge.

[0030] Refer to Figure 2 Or 3, the space enclosed by the corrugated steel plate 101, the steel bottom plate 102 and the steel flange 103 is denoted as cavity S, and a plurality of prestressed reinforcements 105 are inserted into the cavity S along the length direction of the steel bottom plate 102. From the mid-span position to the support position of the steel-concrete composite web 1, the distance between each prestressed reinforcement 105 and the steel bottom plate 102 gradually increases.

[0031] The concrete is filled in the cavity S. The convex and concave structure of the corrugated steel plate 101 increases the frictional resistance between the corrugated steel plate 101 and the concrete contact surface, thereby improving the overall performance of the T-beam.

[0032] See Figure 2 Figure 2 , a plurality of profiled steel shear connectors 104 are uniformly welded to the upper surfaces of the two steel wing plates 103. The cross-section of the profiled steel shear connector 104 is in the shape of an I-beam. The profiled steel shear connector 104 includes an upper flange, a lower flange and a middle web. The lower flange of the profiled steel shear connector 104 is simultaneously welded to the two steel wing plates 103. The plurality of profiled steel shear connectors 104 can limit the shear slip between the steel-concrete composite web 1 and the concrete top plate 2 and the out-of-plane deformation of the upper edge of the corrugated steel plate 101.

[0033] In this embodiment, the following steps are adopted for construction:

[0034] 1. The corrugated steel plate 101, the steel bottom plate 102, the steel wing plate 103 and the profiled steel shear connector 104 are welded into a steel beam in the factory. The processed steel beam is hoisted to the bridge position and used as both a support and a formwork system for the web.

[0035] 2. The formwork for the concrete top plate 2 is erected on site, and the processed steel mesh 201 is hoisted above the formwork;

[0036] 3. The internal filling concrete of the steel-concrete composite web 1 and the concrete of the concrete top plate 2 are poured on site, thereby forming a T-beam structure.

[0037] The above construction method has a low requirement for the hoisting capacity of the crane, and can save the time for erecting the support and the web formwork, with a fast construction speed.

[0038] Embodiment 2:

[0039] This embodiment discloses a T-beam with a corrugated steel plate wrapped around the web, including a steel-concrete composite web 1 and a concrete top plate 2. See Figure 1 Figure 1 , the steel-concrete composite web 1 is vertically connected to the lower surface of the concrete top plate 2.

[0040] See Figure 2 Figure 2 , the steel-concrete composite web 1 includes a corrugated steel plate 101, a steel bottom plate 102, a steel wing plate 103 and a plurality of profiled steel shear connectors 104, as well as the internally filled concrete.

[0041] The steel bottom plate 102 is a horizontally arranged rectangular steel plate. Two corrugated steel plates 101 are vertically welded to the upper surface of the steel bottom plate 102, and the wavelength direction of the corrugated steel plate 101 is parallel to the horizontal plane.

[0042] The two edges of the steel bottom plate 102 along its length direction are respectively denoted as edge A and edge B, and the two corrugated steel plates 101 are respectively close to edge A and edge B of the steel bottom plate 102.

[0043] A steel flange 103 is vertically welded to the upper edge of each corrugated steel plate 101, and the two steel flanges 103 form an inward curling edge.

[0044] See Figure 2 Or 3, the space enclosed by the corrugated steel plate 101, the steel bottom plate 102 and the steel flange 103 is denoted as cavity S, and a number of prestressed steel bars 105 are inserted into the cavity S along the length direction of the steel bottom plate 102.

[0045] The concrete is filled in the cavity S. The convex and concave structure of the corrugated steel plate 101 increases the frictional resistance between the corrugated steel plate 101 and the concrete contact surface, thereby improving the overall performance of the T-beam.

[0046] See Figure 2 , a number of profiled steel shear connectors 104 are evenly welded to the upper surfaces of the two steel flanges 103, and the two ends of each profiled steel shear connector 104 are respectively welded to the two steel flanges 103. The number of profiled steel shear connectors 104 can resist the shear slip between the steel-concrete composite web 1 and the concrete top plate 2.

[0047] Example 3:

[0048] The main structure of this embodiment is the same as that of Example 2. Further, the cross-section of the profiled steel shear connector 104 is in the shape of an I-beam. The profiled steel shear connector 104 includes an upper flange, a lower flange and a middle web, and the lower flange of the profiled steel shear connector 104 is welded to the two steel flanges 103 at the same time.

[0049] Example 4:

[0050] The main structure of this embodiment is the same as that of Example 3. Further, from the mid-span position to the support position of the steel-concrete composite web 1, the distance between each prestressed steel bar 105 and the steel bottom plate 102 gradually increases.

[0051] Example 5:

[0052] The main structure of this embodiment is the same as that of Example 4. Further, see Figure 3 , a number of layers of steel mesh 201 are arranged inside the concrete top plate 2.

Claims

1. A T-beam with a corrugated steel plate wrapped around the web, characterized in that: It includes a steel-concrete composite web (1) and a concrete top plate (2), and the steel-concrete composite web (1) is vertically connected to the lower plate surface of the concrete top plate (2); The steel-concrete composite web (1) includes a corrugated steel plate (101), a steel bottom plate (102), steel flange plates (103) and a number of profiled steel shear connectors (104), as well as the internally filled concrete; The steel bottom plate (102) is a horizontally arranged rectangular steel plate, and two corrugated steel plates (101) are vertically welded to the upper surface of the steel bottom plate (102), and the wavelength direction of the corrugated steel plate (101) is parallel to the horizontal plane; The two side edges of the steel bottom plate (102) along its length direction are respectively denoted as edge A and edge B, and the two corrugated steel plates (101) are respectively close to edge A and edge B of the steel bottom plate (102); The upper edge of each corrugated steel plate (101) is vertically welded with a steel flange plate (103), and the two steel flange plates (103) form an inward curl; The space enclosed by the corrugated steel plate (101), the steel bottom plate (102) and the steel flange plate (103) is denoted as cavity S, and a number of prestressed steel bars (105) are inserted into the cavity S along the length direction of the steel bottom plate (102); the concrete is filled in the cavity S; A number of profiled steel shear connectors (104) are evenly welded to the upper surfaces of the two steel flange plates (103), and the two ends of each profiled steel shear connector (104) are respectively welded to the two steel flange plates (103); The cross-section of the profiled steel shear connector (104) is in the shape of an I-beam. The profiled steel shear connector (104) includes an upper flange, a lower flange and a middle web, and the lower flange of the profiled steel shear connector (104) is simultaneously welded to the two steel flange plates (103).

2. The T-beam with corrugated steel plates wrapped around the web according to claim 1, wherein: From the mid-span position to the support position of the steel-concrete composite web (1), the distance between each prestressed steel bar (105) and the steel bottom plate (102) gradually increases.

3. A T-beam with a corrugated steel plate wrapped around the web according to claim 1, characterized in that: A number of layers of steel mesh sheets (201) are arranged inside the concrete top plate (2).

Images