Built-in steel truss frame externally-wrapped U-shaped steel-concrete composite beam component

Abstract

The utility model discloses a built-in steel truss frame wrapped U-shaped steel-concrete composite beam member which comprises a bottom beam and a reinforced concrete plate, the bottom beam is assembled on the lower portion of the reinforced concrete plate, the bottom beam is wrapped with U-shaped steel, the steel truss frame is arranged in the U-shaped steel, concrete is further filled in the U-shaped steel, a reinforcing mesh is arranged in the reinforced concrete plate, and the steel truss frame is arranged in the reinforcing mesh. And the reinforced concrete plate is connected with the framework in the bottom beam into a whole through a shear connector inserted into concrete, so that the bottom beam and the reinforced concrete plate form an integrated structure. The combined beam has the advantages that formwork erecting procedures and supports are reduced, the construction period is shortened, the structural clearance is increased, the building space is utilized more reasonably, the combined beam can be suitable for projects with larger spans, the fire resistance of the combined beam is improved, and compared with the mode that shear connectors and upper connecting rods are arranged separately, the material consumption and welding work can be reduced.

Description

Technical Field

[0001] The utility model relates to a concrete composite beam member, in particular to a built-in steel truss frame and externally wrapped U-shaped steel-concrete composite beam member. Background Technique

[0002] At present, the externally wrapped U-shaped steel-concrete composite beam solves the problems of local buckling and overall buckling of the steel beam under compressive stress at the lower part of the steel beam under negative bending action in the traditional steel-concrete composite beam composed of a concrete slab and a steel beam through shear connectors, and at the same time has good mechanical properties. The concrete inside the U-shaped steel can absorb heat, and its fire resistance is better than that of the traditional steel-concrete composite beam. In addition, the U-shaped steel component of the externally wrapped U-shaped steel-concrete composite beam can be used as a formwork for concrete pouring during the construction process, avoiding the erection of formwork, accelerating the construction speed, shortening the construction period, and having a high degree of factoryization. Therefore, the externally wrapped U-shaped steel-concrete composite beam has good engineering applications. However, there are still some deficiencies in the structural form of the existing externally wrapped U-shaped steel-concrete composite beam. For example, during the construction stage of large-span projects, the U-shaped steel, as a formwork for concrete pouring, requires a larger cross-section to meet the deformation control and bearing capacity requirements under construction loads; during the normal use stage, the externally wrapped U-shaped steel-concrete composite beam requires a larger cross-sectional size or adopts prestressed technology to meet the deformation control and bearing capacity requirements under large-span structural loads. The larger cross-sectional size reduces the net space and is not conducive to the use of building space, and the construction technology is complex when prestressed technology is adopted. Therefore, it is necessary to improve the existing externally wrapped U-shaped steel-concrete composite beam and propose a new structural form to solve the above deficiencies. Summary of the Invention

[0003] The purpose of the utility model is to provide a built-in steel truss frame and externally wrapped U-shaped steel-concrete composite beam member to solve various problems existing in the use of the existing externally wrapped U-shaped steel-concrete composite beam.

[0004] The built-in steel truss frame and externally wrapped U-shaped steel-concrete composite beam member provided by the utility model includes a bottom beam and a reinforced concrete slab. The bottom beam is assembled under the reinforced concrete slab. The bottom beam is wrapped with U-shaped steel. A steel truss frame is arranged inside the U-shaped steel. Concrete is also filled inside the U-shaped steel. A steel mesh is arranged inside the reinforced concrete slab. The reinforced concrete slab is connected to the skeleton inside the bottom beam as a whole through shear connectors inserted into the concrete, so that the bottom beam and the reinforced concrete slab form an integral structure.

[0005] The steel truss frame includes upper chord bars, lower chord bars, vertical web members, diagonal web members, upper connecting bars and lower connecting bars. Among them, there are two upper chord bars and two lower chord bars arranged in parallel. The upper chord bars and the lower chord bars are arranged correspondingly. The two upper chord bars, the two lower chord bars and two or several vertical web members form a frame corresponding to the inner cavity size of the U-shaped steel. The diagonal web members are assembled between the upper and lower corresponding upper chord bars and lower chord bars. The upper connecting bar is connected to the two upper chord bars arranged in parallel, and the upper connecting bar is connected to the upper top surfaces of the two upper chord bars. The lower connecting bar is connected to the two lower chord bars arranged in parallel, and the lower connecting bar is connected between the two lower chord bars or to the upper top surfaces or lower bottom surfaces of the two lower chord bars.

[0006] The upper connecting bar also serves as a shear-resistant connecting piece, and the structure of the upper connecting bar is an angle steel or a channel steel.

[0007] The upper chord bars, lower chord bars, vertical web members, diagonal web members, upper connecting bars and lower connecting bars are made of steel pipes or steel pipes filled with mortar or concrete or steel bars or channel steels or angle steels or combinations of angle steels.

[0008] There are several columns of vertical web members arranged between the upper and lower corresponding upper chord bars and lower chord bars. The adjacent vertical web members are connected obliquely up and down by diagonal web members. Taking the midpoint of the upper chord bar and the lower chord bar as the boundary, the diagonal web members on one side are arranged obliquely upward in parallel, and the diagonal web members on the other side are arranged obliquely downward in parallel.

[0009] Vertical web members are arranged at both ends of the upper and lower corresponding upper chord bars and lower chord bars. The diagonal web members are arranged between the vertical web members at both ends, and the diagonal web members are arranged in a regular triangle or an inverted triangle. The diagonal web members are formed by bending a whole steel bar.

[0010] The manufacturing principle of the present utility model:

[0011] Both of the front and rear plane steel trusses in the U-shaped steel-concrete composite beam member with an internal steel truss frame provided by the present utility model include upper chord bars, lower chord bars, diagonal web members and end vertical web members, and it is also possible to add vertical web members within the span. The first form of the plane steel truss is to weld the ends of the upper chord bars and the lower chord bars and several vertical web members within the span to form a rectangular structure, and weld a plurality of diagonal web members between them to form a plane steel truss; the second form of the plane steel truss is to only set vertical web members at the ends of the truss, weld them with the upper chord bars and the lower chord bars to form a rectangular structure, and weld several diagonal web members between them to form a plane steel truss; the diagonal web members of the third form of the plane steel truss are in a continuous wavy shape, formed by continuously bending a steel bar. The upper chord bars and the lower chord bars are welded parallelly at the peaks and valleys of the wavy diagonal web members, and vertical web members are arranged at the ends; the diagonal web members of the fourth form of the plane steel truss are in a continuous wavy shape, formed by continuously bending a steel bar. The upper chord bars are welded at the peaks of the wavy diagonal web members, the lower chord bars are welded parallelly with the upper chord bars at a set distance above the valleys of the diagonal web members, and vertical web members are designed at the ends.

[0012] The members forming the steel truss frame are made of steel pipes, or steel pipes filled with mortar or concrete inside, or steel bars, or channel steels, or angle steels, or T-shaped steels composed of angle steel combinations.

[0013] Horizontal straight connecting rods perpendicular to the plane steel truss are added at the joints of the upper chord and lower chord of the plane steel truss to form an integral steel truss frame.

[0014] The top of the upper chord of the steel truss frame is flush with the top of the upper flange of the U-shaped steel. The upper connecting rod at the top also serves as the shear connector between the composite beam and the concrete slab. The upper connecting rod at the top is welded to the top of the upper chord of the steel truss frame and the upper surface of the U-shaped steel flange. Through the shear connector, the steel truss frame and the U-shaped steel become an integral whole and jointly bear the force during the construction stage.

[0015] The lower chord of the steel truss frame is closely attached to the lower flange of the U-shaped steel. Or a concrete layer is provided between the lower chord of the steel truss frame and the lower flange of the U-shaped steel. The concrete layer can slow down the heating rate of the lower chord of the steel bar and improve the fire resistance of the composite beam.

[0016] The steel truss frame adopts plane steel trusses in different forms and upper connecting rods (including angle steels and channel steels).

[0017] After the U-shaped steel and the steel truss frame are assembled through shear connectors, the steel mesh of the concrete floor slab is arranged, and then the bottom beam and the reinforced concrete slab are poured together. After the concrete hardens, the built-in steel truss and the outer U-shaped steel-concrete composite beam and the reinforced concrete floor slab form a T-shaped cross-section composite beam to bear the load during the service stage.

[0018] The beneficial effects of the present utility model:

[0019] 1. The outer U-shaped steel of the present utility model can be used as the concrete pouring formwork of the composite beam during the construction stage. Through the common force of the built-in steel truss and the U-shaped steel, the stiffness and bearing capacity of the original U-shaped steel formwork are improved. Under the same span and construction load, a smaller cross-section than the original U-shaped steel can be adopted, increasing the structural net clearance and making more full use of the building space. It is also applicable to prefabricated projects with larger spans, reducing the formwork erection process and supports, and shortening the construction period.

[0020] 2. The built-in steel truss of the present utility model improves the stress condition of the composite beam. The upper chord and lower chord of the steel truss can be used as longitudinal bars to improve the flexural bearing capacity of the composite beam. The chord bars in the tension zone effectively relieve the cracking of the concrete in the tension zone of the beam, and the diagonal web members can be used as web reinforcement to improve the shear bearing capacity of the beam. That is, the built-in steel truss improves the overall stiffness and bearing capacity of the composite beam, reduces the cross-section size of the outer U-shaped steel-concrete composite beam members, increases the structural net clearance, makes more reasonable use of the building space, and can be applicable to projects with larger spans.

[0021] 3. When a space is left between the bottom of the steel truss frame and the lower flange of the outer U-shaped steel for the concrete layer, the concrete layer can delay the temperature rise of the built-in steel truss under fire, improving the fire resistance of the composite beam.

[0022] 4. Angle steel or channel steel is used as the shear connector between the composite beam and the concrete slab and also serves as the upper connecting rod of the steel truss frame, serving two purposes with one component. Compared with the separate arrangement of the shear connector and the upper connecting rod, it can reduce the material consumption and welding work. Brief Description of the Drawings

[0023] Figure 1 Schematic diagram of the overall structure of the built-in steel truss and outer U-shaped steel-concrete composite beam component described in the present utility model.

[0024] Figure 2 Longitudinal schematic diagram of the overall steel truss frame described in the present utility model.

[0025] Figure 3 Cross-sectional schematic diagram of the steel truss frame described in the present utility model.

[0026] Figure 4 Schematic diagram of the first arrangement of the diagonal web members described in the present utility model.

[0027] Figure 5 Schematic diagram of the second arrangement of the diagonal web members described in the present utility model.

[0028] Figure 6 Schematic diagram of the third arrangement of the diagonal web members described in the present utility model.

[0029] Figure 7 Schematic diagram of the fourth arrangement of the diagonal web members described in the present utility model.

[0030] Figure 8 Schematic diagram of the fifth arrangement of the diagonal web members described in the present utility model.

[0031] Figure 9 Cross-sectional schematic diagram of the first form of the composite beam described in the present utility model.

[0032] Figure 10 Cross-sectional schematic diagram of the second form of the composite beam described in the present utility model.

[0033] The markings in the above-mentioned drawings are as follows:

[0034] 1. Bottom beam 2. Reinforced concrete slab 3. U-shaped steel 4. Steel truss frame 5. Steel mesh

[0035] 6. Upper chord 7. Lower chord 8. Vertical web member 9. Diagonal web member 10. Upper connecting rod

[0036] 11. Lower connecting rod. Detailed Implementation Modes

[0037] Please refer to Figures 1 to 10 shown as follows:

[0038] The built-in steel truss frame and U-shaped steel-concrete composite beam member provided by the present utility model includes a bottom beam 1 and a reinforced concrete slab 2. The bottom beam 1 is assembled under the reinforced concrete slab 2. The bottom beam 1 is wrapped with a U-shaped steel 3. A steel truss frame 4 is arranged in the U-shaped steel 3. Concrete is also filled in the U-shaped steel 3. A steel mesh 5 is arranged in the reinforced concrete slab 2. The reinforced concrete slab 2 is integrally connected to the skeleton in the bottom beam 1 through shear connectors inserted in the concrete, so that the bottom beam 1 and the reinforced concrete slab 2 form an integral structure.

[0039] The steel truss frame 4 includes an upper chord 6, a lower chord 7, vertical web members 8, diagonal web members 9, upper connecting rods 10 and lower connecting rods 11. Among them, there are two upper chords 6 and two lower chords 7 arranged in parallel. The upper chord 6 and the lower chord 7 are arranged correspondingly. The two upper chords 6 and the two lower chords 7 and two or several vertical web members 8 form a frame corresponding to the inner cavity size of the U-shaped steel 3. The diagonal web members 9 are assembled between the upper chord 6 and the lower chord 7 arranged correspondingly up and down. The upper connecting rod 10 is connected to the two upper chords 6 arranged in parallel. The upper connecting rod 10 is connected to the upper top surface of the two upper chords 6. The lower connecting rod 7 is connected to the two lower chords 7 arranged in parallel. The lower connecting rod 11 is connected between the two lower chords 7 or the upper top surface or the lower bottom surface of the two lower chords 7.

[0040] The upper connecting rod 10 also serves as a shear connector, and the structure of the upper connecting rod 10 is an angle steel or a channel steel.

[0041] The upper chord 6, the lower chord 7, the vertical web member 8, the diagonal web member 9, the upper connecting rod 10 and the lower connecting rod 11 are made of steel pipes or steel pipes filled with mortar or concrete or steel bars or channel steels or angle steels or combinations of angle steels.

[0042] A series of vertical web members 8 are arranged between the upper chord 6 and the lower chord 7 arranged correspondingly up and down. The adjacent vertical web members 8 are obliquely connected up and down through diagonal web members 9. Taking the midpoint of the upper chord 6 and the lower chord 7 as the boundary, the diagonal web members 9 on one side are arranged obliquely upward in parallel, and the diagonal web members 9 on the other side are arranged obliquely downward in parallel.

[0043] Vertical web members 8 are arranged at both ends of the upper chord 6 and the lower chord 7 arranged correspondingly up and down. The diagonal web members 9 are arranged between the vertical web members 8 at both ends. The diagonal web members 9 are arranged in a regular upright triangle or an inverted triangle. The diagonal web members 9 are formed by bending a whole steel bar.

[0044] The manufacturing principle of the present utility model:

[0045] In the built-in steel truss frame and U-shaped steel-concrete composite beam member provided by the utility model, the front and rear two plane steel trusses both include an upper chord 6, a lower chord 7, diagonal web members 9 and end vertical web members 8, and the in-span vertical web members 8 can also be added. The first form of the plane steel truss is to weld the ends of the upper chord 6 and the lower chord 7 and several in-span vertical web members 8 to form a rectangular structure, and weld several diagonal web members 9 between them to form a plane steel truss; the second form of the plane steel truss is to only set vertical web members 8 at the ends of the truss, weld them with the upper chord 6 and the lower chord 7 to form a rectangular structure, and weld several diagonal web members 9 between them to form a plane steel truss; the diagonal web members 9 of the third form of the plane steel truss are in a continuous wave shape, formed by continuously bending steel bars, and the upper chord 6 and the lower chord 7 are welded parallelly at the crests and troughs of the wave-shaped diagonal web members 9, and vertical web members 8 are set at the ends; the diagonal web members 9 of the fourth form of the plane steel truss are in a continuous wave shape, formed by continuously bending steel bars, the upper chord 6 is welded at the crests of the wave-shaped diagonal web members 9, the lower chord 7 is welded parallelly with the upper chord 6 at a set distance above the troughs of the diagonal web members 9, and vertical web members 8 are designed at the ends.

[0046] The members forming the steel truss frame 4 are made of steel pipes or steel pipes filled with mortar or concrete inside, or steel bars, or channel steels, or angle steels, or T-shaped steels composed of angle steel combinations.

[0047] Horizontal straight connecting rods perpendicular to the plane steel truss are added at the joints of the upper chord 6 and the lower chord 7 of the plane steel truss to form an integral steel truss frame 4.

[0048] The top of the upper chord 6 of the steel truss frame 4 is flush with the top of the upper flange of the U-shaped steel 3. The top upper connecting rod 10 also serves as a shear connector between the composite beam and the concrete slab. The top upper connecting rod 10 is welded to the top of the upper chord 6 of the steel truss frame 4 and the upper surface of the flange of the U-shaped steel 3. Through the shear connector, the steel truss frame 4 and the U-shaped steel 3 become an integral part and jointly bear the force during the construction stage.

[0049] The lower chord 7 of the steel truss frame 4 is closely attached to the lower flange of the U-shaped steel 3. Or a concrete layer is provided between the lower chord 7 of the steel truss frame 4 and the lower flange of the U-shaped steel 3. The concrete layer can slow down the heating rate of the lower chord of the steel bar and improve the fire resistance of the composite beam.

[0050] The steel truss frame 4 adopts different forms of plane steel trusses and upper connecting rods 10 (including angle steels and channel steels).

[0051] After the U-shaped steel 3 and the steel truss frame 4 are assembled through shear connectors, the steel bar mesh 5 of the concrete floor slab is arranged, and then the bottom beam 1 and the reinforced concrete slab 2 are poured together. After the concrete hardens, the built-in steel truss and the U-shaped steel 3-concrete composite beam and the reinforced concrete floor slab form a T-shaped cross-section composite beam to bear the load during the service stage.

Claims

1. A U-shaped steel-concrete composite beam component with an internal steel truss frame and an external outer layer, characterized in that: It includes a bottom beam and a reinforced concrete slab, wherein the bottom beam is assembled at the lower part of the reinforced concrete slab, the bottom beam is wrapped with U-shaped steel, a steel truss frame is arranged inside the U-shaped steel, the U-shaped steel is also filled with concrete, a steel mesh is arranged inside the reinforced concrete slab, and the reinforced concrete slab is connected to the skeleton in the bottom beam as a whole through a shear connector inserted in the concrete, so that the bottom beam and the reinforced concrete slab form an integrated structure.

2. The inner steel truss frame outer-wrapped U-shaped steel-concrete composite beam member according to claim 1, characterized in that: The steel truss frame includes an upper chord, a lower chord, a vertical web, a diagonal web, an upper connecting rod and a lower connecting rod, wherein two upper chords and two lower chords are arranged in parallel, the upper chords and the lower chords are arranged correspondingly, the two upper chords and the two lower chords and two or more vertical webs form a frame corresponding to the size of the U-shaped steel inner cavity, the diagonal web is assembled between the upper chords and the lower chords corresponding to the upper and lower parts, the upper connecting rod is connected to the two upper chords arranged in parallel, the upper connecting rod is connected to the upper top surfaces of the two upper chords, the lower connecting rod is connected to the two lower chords arranged in parallel, and the lower connecting rod is connected between the two lower chords or to the upper top surface or the lower bottom surface of the two lower chords.

3. The inner steel truss frame outer-wrapped U-shaped steel-concrete composite beam member according to claim 2, characterized in that: The upper connecting rod also serves as a shear-resistant connecting piece, and the structure of the upper connecting rod is angle steel or channel steel.

4. The inner steel truss frame outer-wrapped U-shaped steel-concrete composite beam member according to claim 2, characterized in that: The upper chord, lower chord, vertical web, diagonal web, upper connecting rod and lower connecting rod are steel pipes or steel pipes filled with mortar or concrete or steel bars or channel steels or angle steels or a combination of angle steels.

5. The inner steel truss frame outer-wrapped U-shaped steel-concrete composite beam member according to claim 2, characterized in that: Several rows of vertical web members are arranged between the upper chord and the lower chord which are arranged correspondingly up and down, and adjacent vertical web members are obliquely connected up and down by oblique web members, with the midpoint of the upper chord and the lower chord as the boundary, and the oblique web members on one side are arranged to be inclined upward and parallel, while the oblique web members on the other side are arranged to be inclined downward and parallel.

6. The inner steel truss frame outer-wrapped U-shaped steel-concrete composite beam member according to claim 2, characterized in that: Vertical web members are arranged at both ends of the upper and lower chord members correspondingly arranged up and down, and the diagonal web members are arranged between the vertical web members at both ends. The diagonal web members are arranged in an upright triangle or an inverted triangle, and are formed by bending a whole steel bar.

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