Composite beam with steel-concrete structure

Abstract

A steel-concrete structure composite beam belongs to the technical field of building structures. The steel-concrete structure composite beam comprises a reinforced concrete floor slab, the supporting steel plate is fixed at the bottom of the reinforced concrete floor; the steel pipe beam is relatively fixed with the supporting steel plate along the direction parallel to the axial direction of the steel pipe beam through a group of channel steel structures or at least one group of L-shaped steel structures; the L-shaped steel structure and the groove-shaped steel structure are fixedly connected with the supporting steel plate through shear-resistant studs. According to the utility model, the connection mode between the steel pipe beam and the reinforced concrete floor is improved, and the connection reliability is improved.

Description

Technical Field

[0001] The utility model relates to a technology in the field of building structures, in particular to a steel-concrete structure composite beam. Background Art

[0002] Steel has the characteristics of high strength, light weight, strong deformation ability and high construction efficiency. It is widely used in the construction field, especially in large-span public buildings and industrial plant buildings.

[0003] Steel tubes replace cylindrical wood beams and are used in conjunction with reinforced concrete slabs or steel truss floor decks to overcome the poor durability of wood beams, fully utilize the tensile properties of steel, and bring into play the characteristics of high bearing capacity, good durability, and good fire resistance and corrosion resistance of concrete slabs. However, the contact surface between the steel tube beam and the concrete slab is small (the contact surface can be considered to be a line), not only can it not work together as a steel and concrete composite beam, but even the effective connection between the beam and the slab is problematic, which brings safety hazards to the project.

[0004] In order to solve the above problems in the prior art, the present invention is provided. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model proposes a steel-concrete structure composite beam, improves the connection mode between the steel tube beam and the reinforced concrete floor slab, and improves the connection reliability.

[0006] The utility model relates to a steel-concrete structure composite beam, comprising:

[0007] reinforced concrete floor slabs;

[0008] A supporting steel plate, wherein the supporting steel plate is fixed to the bottom of the reinforced concrete floor slab;

[0009] and a steel tube beam, wherein the steel tube beam is fixed relative to the supporting steel plate through a group of trough-shaped steel structures or at least one group of L-shaped steel structures in a direction parallel to the axial direction of the steel tube beam;

[0010] The L-shaped steel structure and the channel-shaped steel structure are fixedly connected to the supporting steel plate by shear bolts.

[0011] The supporting steel plate can be an open corrugated steel plate, a closed corrugated steel plate or a self-supporting steel bottom form. Preferably, the supporting steel plate is welded and fixed to the steel bars in the reinforced concrete floor slab.

[0012] In some specific embodiments, the trough-shaped steel structure includes a back plate and a wing plate that are integrally formed or welded, the back plate is fixedly connected to the steel tube beam and the supporting steel plate, and the wing plate is fixedly connected to the steel tube beam. Preferably, the back plate is welded to the supporting steel plate, and the wing plate is welded to the steel tube beam, which can withstand bending moment; further preferably, two rows of shear studs are arranged in a direction parallel to the axis of the steel tube beam, thereby improving the shear resistance of the structure.

[0013] In some specific implementation schemes, the trough-shaped steel structure is an axisymmetric structure along the axis direction of the steel tube beam, and the maximum spacing between the outer sides of the two wing plates of the trough-shaped steel structure is less than or equal to the outer diameter of the steel tube beam.

[0014] In some specific embodiments, the L-shaped steel structure includes an inner limb and an outer limb that are integrally formed or welded; the inner limb is fixedly connected to the supporting steel plate, and the outer limb is fixedly connected to the steel tube beam. Preferably, the inner limb of the L-shaped steel structure is welded to the supporting steel plate, and the outer limb is welded to the steel tube beam, which can withstand bending moment; further preferably, shear studs are arranged in a direction parallel to the axis of the steel tube beam, thereby improving the shear resistance of the structure.

[0015] In some specific embodiments, one or two groups of L-shaped steel structures are provided; when two groups are provided, the structure is axially symmetrical along the axis of the steel tube beam. The outer side spacing of the outer limbs of the two groups of L-shaped steel structures can be less than the outer diameter of the steel tube beam, or can be greater than or equal to the outer diameter of the steel tube beam.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] 1) By adding L-shaped steel structure or trough steel structure, the disadvantage of small contact surface between steel tube beam and reinforced concrete floor slab is eliminated, and the connection reliability between steel tube beam and floor slab is significantly improved;

[0018] 2) By adding L-shaped steel structures or trough-shaped steel structures, the problem of small contact surface and poor reliability of steel tube beams being fixed only by shear bolts can be avoided; the steel tube beams and concrete slabs can be effectively guaranteed to work together as composite beams, saving materials while increasing safety reserves;

[0019] 3) L-shaped steel structures or trough-shaped steel structures are non-load-bearing components, and the choice of structural dimensions is flexible and diverse; the L-shaped steel structure can exceed the outer diameter range of the steel tube beam without affecting or considering the cross-sectional effect of the steel tube beam. When the cross-sectional effect of the steel tube beam needs to be considered, the L-shaped steel structure should not exceed the outer diameter range of the steel tube beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the steel tube beam along the axial direction of Example 1;

[0021] Figure 2for Figure 1 Schematic diagram of the AA section structure;

[0022] Figure 3 This is a schematic diagram of the structure of a seven-purlin large timber frame antique building according to Example 1;

[0023] Figure 4 AA section structure schematic diagram of Example 2 when a channel-shaped steel structure is used;

[0024] In the figure: 100, reinforced concrete floor slab; 101, steel truss; 102, concrete; 200, supporting steel plate; 300, steel tube beam; 400, hot-rolled equal-leg angle steel; 500, shear studs; 600, channel steel structure. DETAILED DESCRIPTION

[0025] The utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Example 1

[0027] This embodiment is described by taking a cast-in-place steel bar truss floor deck as an example.

[0028] After the steel tube beam is positioned, two rows of L-shaped steel structures are erected parallel to the axial direction of the steel tube beam and on both sides of the axial direction of the steel tube beam, and welding is performed to form fillet welds, thereby fixing the L-shaped steel structure on the steel tube beam. The L-shaped steel structure preferably uses hot-rolled equal-angle steel, and of course the L-shaped steel structure can also be welded with flat steel.

[0029] Then, according to the relevant specifications and design requirements of steel and concrete composite beams (such as standard JG / T368-2012), several rows of shear studs are arranged, of which two rows of shear studs pass through the bottom formwork steel plate and are fixedly connected to the hot-rolled equilateral angle steels at the corresponding positions; after the shear studs are arranged, concrete is poured on the bottom formwork steel plate to obtain the reinforced truss floor deck.

[0030] Based on the above operations, the final product is Figure 1 and Figure 2 The steel-concrete composite beam shown. The steel-concrete composite beam comprises:

[0031] A reinforced concrete floor 100, which is provided with a steel truss 101 and a concrete structural layer 102;

[0032] A supporting steel plate 200, which is arranged at the bottom of the reinforced concrete floor 100 and is welded and fixed to the steel truss 101; the supporting steel plate 200 is provided with holes;

[0033] and a steel tube beam 300, wherein the steel tube beam 300 is relatively fixed to the supporting steel plate 200 through two sets of hot-rolled equilateral angle steels 400 in a direction parallel to the axial direction;

[0034] The inner lateral branch of the hot-rolled equilateral angle steel 400 is fixedly connected to the support steel plate 200 by welding to form a fillet weld, and is fixedly connected by shear bolts 500 inserted into holes of the support steel plate 200.

[0035] The outer vertical limbs of the hot-rolled equal-angle steel 400 are fixed to the steel tube beam 300 by groove welding. The outer side spacing of the two sets of hot-rolled equal-angle steel 400 is less than the outer diameter of the steel tube beam 300. In the case that the cross-sectional effect of the steel tube beam is not affected or the cross-sectional effect of the steel tube beam does not need to be considered, the outer side spacing of the outer vertical limbs can also be greater than or equal to the outer diameter of the steel tube beam 300.

[0036] The steel-concrete composite beam of this embodiment can be used in antique buildings such as seven-purlin large wooden frames. The steel tube beam is used as the purlin, and the steel truss floor deck is used as the roof. Figure 3 As shown, considering the visual effect of antique buildings, only one group of L-shaped steel structures can be set at the eaves purlin position, facing the ridge purlin direction. Two groups are set at the lower golden purlin, upper golden purlin and ridge purlin positions to improve structural reliability.

[0037] Example 2

[0038] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the two groups of hot-rolled equal-angle steels are replaced by a group of channel-shaped steel structures 600.

[0039] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A steel-concrete composite beam, characterized in that: include: reinforced concrete floor slabs; A supporting steel plate, wherein the supporting steel plate is fixed to the bottom of the reinforced concrete floor slab; and a steel tube beam, wherein the steel tube beam is fixed relative to the supporting steel plate through a group of trough-shaped steel structures or at least one group of L-shaped steel structures in a direction parallel to the axial direction of the steel tube beam; The L-shaped steel structure and the channel-shaped steel structure are fixedly connected to the supporting steel plate by shear bolts.

2. The steel-concrete composite beam according to claim 1, characterized in that: The L-shaped steel structure comprises an inner limb and an outer limb which are fixedly connected, wherein the inner limb is fixedly connected to the supporting steel plate, and the outer limb is fixedly connected to the steel pipe beam.

3. The steel-concrete composite beam according to claim 1, characterized in that: The trough-shaped steel structure comprises a back plate and two wing plates which are fixedly connected. The back plate is respectively fixedly connected to the steel tube beam and the supporting steel plate, and the wing plates are fixedly connected to the steel tube beam.

4. The steel-concrete composite beam according to claim 2 or 3, characterized in that: The supporting steel plate is connected to the L-shaped steel structure or the trough-shaped steel structure by welding, and the steel tube beam is connected to the L-shaped steel structure or the trough-shaped steel structure by welding.

5. The steel-concrete composite beam according to claim 3, characterized in that: The trough-shaped steel structure is an axisymmetric structure along the axis direction of the steel tube beam.

6. The steel-concrete composite beam according to claim 5, characterized in that: The maximum spacing between the outer sides of the two wing plates is less than or equal to the outer diameter of the steel tube beam.

7. The steel-concrete composite beam according to claim 2, characterized in that: The L-shaped steel structure is provided in two groups, and is an axisymmetric structure along the axis direction of the steel tube beam.

8. The steel-concrete composite beam according to claim 7, characterized in that: The maximum spacing between the outer sides of the two groups of outer branches of the L-shaped steel structure is smaller than the outer diameter of the steel tube beam.

9. The steel-concrete composite beam according to claim 7, characterized in that: The maximum spacing between the outer sides of the two groups of outer branches of the L-shaped steel structure is greater than or equal to the outer diameter of the steel tube beam.

Images