A shear-resistant member of a U-shaped steel-concrete composite beam stirrup and its construction method

Abstract

The present invention discloses a shear-resistant hanger for a U-shaped steel-concrete composite beam and its construction method, including a steel cross beam and a reinforced truss floor slab, and a novel shear-resistant hanger. It is characterized in that the steel cross beam is a U-shaped steel beam, and bottom plates are arranged on both sides of the steel cross beam and fixedly connected to the steel cross beam; a steel bar truss is laid on the steel cross beam, and its lower chord steel bars are welded to the upper flange of the steel cross beam; at least one fixing steel bar is distributed at the gap between the two upper flanges of the steel cross beam corresponding to the steel bar truss. In the present invention, shear-resistant hangers are used to replace stud bolts. The shear-resistant hangers are directly hung on the fixing steel bars and simply tied, reducing the workload of welders. At the same time, after the shear-resistant hangers are fixed, they will not interfere with subsequent construction operations, and the construction cost is reduced while maintaining the original effect.

Description

Technical Field

[0001] The present invention relates to the field of structural beams for buildings, and particularly to a shear-resistant member of a hanger bar for a U-shaped steel-concrete composite beam and a construction method thereof. Background Art

[0002] In the current construction industry, a steel-concrete composite beam refers to a flexural member formed by connecting a steel beam and a concrete slab into a whole through shear connectors. Among them, when the steel beam is connected to the concrete floor slab, a method of welding shear connectors to the upper flange of the H-shaped steel beam is generally used to connect the steel beam and the concrete floor slab. There is also a method of welding shear connectors to the upper flange of the U-shaped steel beam to connect the two. The shear connectors generally use stud bolts, and there are also those using angle steel, etc.

[0003] However, such a connection method has certain problems: 1) The connection between the shear connector and the steel beam is mainly completed by welding. Since the number of shear connectors is large, this also increases the workload of welders; 2) The existing shear connectors generally use stud bolts, and the consumption of stud bolts is large, increasing the construction cost; 3) There are certain requirements for the thickness of the steel beam and the skills of welders. If the welding technology is not good, it is easy to weld through the steel beam, especially for the U-shaped steel beam with a relatively thin thickness; 4) The presence of stud bolts or angle steel connectors has a certain impact on other operations of construction workers, such as the laying and binding of floor slab steel bars. Summary of the Invention

[0004] Aiming at the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide a shear-resistant member of a hanger bar for a U-shaped steel-concrete composite beam and a construction method thereof, so as to solve the technical problems in the prior art that the welding workload of shear connectors is large, the requirements for welding technology are high, the construction cost is high, and it affects other construction operations of construction workers.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A shear-resistant hanger for a U-shaped steel-concrete composite beam, comprising a steel cross beam and a profiled steel sheeting with steel bar truss. The profiled steel sheeting with steel bar truss includes a steel bar truss and a bottom plate. The steel cross beam is a U-shaped steel beam, and the upper side edges of the two side walls of the steel cross beam are bent and extended towards opposite directions to form upper flanges. The bottom plate is horizontally arranged on both sides of the steel cross beam, close to the upper flanges of the steel cross beam, and is fixedly connected to the steel cross beam. The steel bar truss is laid on the steel cross beam, and its length direction is perpendicular to the length direction of the steel cross beam. The steel bar truss is fixedly connected at the contact with the steel cross beam, and the lower side of the steel bar truss is fixedly connected to the bottom plate. At least one fixing steel bar is distributed at the gap between the two upper flanges of the steel cross beam corresponding to the steel bar truss, and the length direction of the fixing steel bar is consistent with the length direction of the steel cross beam. Several shear-resistant hangers are distributed along the length direction of the fixing steel bar. The middle part of the shear-resistant hanger is hung on the fixing steel bar, and both ends of the shear-resistant hanger extend downward and penetrate into the steel cross beam, and then are bent to form a bent section. Concrete is poured into the steel cross beam, and concrete is also poured on the steel bar truss, so that the concrete and the steel bar truss form a reinforced concrete floor slab as a whole. During actual construction, concrete is poured into the steel cross beam and the profiled steel sheeting with steel bar truss, so that the steel bar truss and the shear-resistant hangers are buried in the concrete. The concrete in the steel cross beam and the concrete covering the steel bar truss are integrated through the shear-resistant hangers. At the same time, the poured concrete is vibrated, and it can be used after the concrete solidifies.

[0007] In the prior art, when a steel beam is connected to a concrete floor slab, a plurality of shear-resistant stud bolts are generally welded on the top of the steel beam. This not only increases the welding workload, but also the welded shear-resistant stud bolts stand in multiple rows on the top of the steel beam, which will hinder the subsequent construction operations of construction workers. Moreover, welding shear-resistant stud bolts has certain requirements for the thickness of the steel beam. When applied to a new type of U-shaped steel beam, due to the relatively thin thickness of the U-shaped steel beam, when welding shear-resistant stud bolts, the technical requirements for welders are relatively high. Once the operation is improper, it is easy to cause the situation of welding through the steel beam.

[0008] In the present invention, shear-resistant hangers are used to replace shear-resistant stud bolts. The middle part of the shear-resistant hanger can be directly hung on the fixing steel bar, so that both ends of the shear-resistant hanger are located inside the U-shaped steel beam. During use, the shear-resistant hangers can be simply fixed with plastic ties or steel wires without welding operations. This greatly reduces the workload of welders. At the same time, the fixing of the shear-resistant hangers will not damage the steel beam, and the fixed shear-resistant hangers will not hinder the subsequent construction operations of construction workers. Moreover, the cost of the shear-resistant hangers is lower than that of the stud bolts, only 70% of the cost of the stud bolts. On the basis of maintaining the original effect, the use of shear-resistant hangers can well reduce the construction cost.

[0009] Furthermore, the bottom plate is located below the upper flange of the steel cross beam. After pouring concrete, part of the steel cross beam will be buried in the reinforced concrete floor slab, so that the poured concrete steel cross beam and the reinforced concrete floor slab form an integral body.

[0010] Further, both ends of the shear-resistant hanger bars are bent towards opposite directions to form bent segments. The inward bending of both ends of the shear-resistant hanger bars makes the shape of the shear-resistant hanger bars similar to that of stirrups, enabling the steel cross beam and the reinforced concrete floor slab to form an integral body after concrete pouring, and at the same time enhancing the shear strength.

[0011] Further, both ends of the shear-resistant hanger bars are bent towards opposite directions to form bent segments. The outward bending of both ends of the shear-resistant hanger bars can make the steel beam and the reinforced concrete floor slab form an integral body after concrete pouring, enhancing the stability.

[0012] Further, several connecting plates are distributed at intervals along the length direction of the steel cross beam on the two upper flanges of the steel cross beam, and both ends of the connecting plates are fixedly connected to the two upper flanges of the steel cross beam respectively. The connecting plates are used to reinforce the steel cross beam to prevent the concrete from squeezing the two sides of the steel cross beam during concrete pouring, thus causing the deformation of the steel cross beam.

[0013] Further, the gap between the two upper flanges of the steel cross beam is not less than 60 mm.

[0014] Further, the steel cross beam is a cold-formed U-shaped steel beam or a welded U-shaped steel beam. The U-shaped steel beam can be formed by cold-bending a steel plate or welded by steel plates.

[0015] A construction method for a shear-resistant member of a U-shaped steel-concrete composite beam hanger bar includes the following steps:

[0016] (1) According to the construction design requirements, the steel cross beam is erected at the designed position and temporarily fixed.

[0017] (2) A reinforced steel truss floor formwork is laid under the upper flange of the steel cross beam, and the bottom plate is fixedly connected to the steel cross beam. The bottom plate can be fixedly connected to the steel cross beam by welding or angle steel.

[0018] (3) The lower chord steel bars of the reinforced steel truss are fixedly connected to the upper flange of the steel cross beam. The contact part between the reinforced steel truss and the upper flange of the steel cross beam can be fixedly connected by welding.

[0019] (4) A plurality of fixing steel bars are laid on the reinforced steel truss, so that at least one fixing steel bar is distributed at the gap between the two upper flanges of the steel cross beam corresponding to the reinforced steel truss. The length direction of the fixing steel bar is consistent with the length direction of the steel cross beam, and the fixing steel bar is fixedly connected to the reinforced steel truss.

[0020] (5) Several shear-resistant hanger bars are hung on the fixing steel bars corresponding to the gap position between the two upper flanges of the steel cross beam, so that both ends of the shear-resistant hanger bars are located inside the steel cross beam, and the shear-resistant hanger bars are fixed.

[0021] (6) Pour concrete into the steel cross beam and the steel bar truss floor slab. Pour the concrete to the designed thickness so that the concrete completely covers the steel bar truss and the shear-resistant hanger bars. Through the shear-resistant hanger bars, the concrete in the steel cross beam and the concrete covering the steel bar truss form an integral body. At the same time, vibrate the concrete until it is dense, and wait for the concrete to solidify.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses shear-resistant hanger bars as the shear connectors between the U-shaped steel beam and the concrete slab. The middle part of the shear-resistant hanger bars can be directly hung on the fixed steel bars and simply fixed by cable ties or steel wires. Welding is not required during the fixing process. On the one hand, it greatly reduces the workload of the welding workers during construction. On the other hand, it also avoids the damage to the steel cross beam caused by welding operations.

[0024] 2. The shear-resistant hanger bars in the present invention are hung on the fixed steel bars and will not stand in several rows like the shear studs after welding, which will not interfere with the subsequent construction operations of the construction workers.

[0025] 3. The cost of the shear-resistant hanger bars in the present invention is relatively low, only 70% of the cost of the shear studs. On the basis of ensuring the original effect, the use of the shear-resistant hanger bars can well save the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention.

[0027] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0028] Figure 3 It is a schematic structural diagram of Embodiment 3 of the present invention.

[0029] In the figure: steel cross beam 1, bottom plate 2, steel bar truss 3, fixed steel bar 4, shear-resistant hanger bar 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] Embodiment 1: Refer to the attached Figure 1 , a shear-resistant member for a U-shaped steel-concrete composite beam hanger bar, including a steel cross beam 1 and a steel bar truss floor slab. The steel bar truss floor slab includes a steel bar truss 3 and a bottom plate 2. The steel cross beam 1 is a U-shaped steel beam arranged horizontally. The upper side edges of the two side walls of the steel cross beam 1 are bent and extended in opposite directions to form upper flanges. The steel cross beam 1 is a cold-formed U-shaped steel beam or a welded U-shaped steel beam. The gap between the two upper flanges of the steel cross beam 1 is not less than 60 mm.

[0032] The bottom plate 2 is horizontally arranged on both sides of the steel cross beam 1, close to the upper flange of the steel cross beam 1, and fixedly connected to the steel cross beam 1. In specific implementation, the bottom plate 2 is located below the upper flange of the steel cross beam 1. The steel bar truss 3 is laid on the steel cross beam 1, and its length direction is perpendicular to the length direction of the steel cross beam 1. The contact part between the steel bar truss 3 and the steel cross beam 1 is fixedly connected, and the lower side of the steel bar truss 3 is fixedly connected to the bottom plate. During actual assembly, the contact part between the steel bar truss 3 and the bottom plate 2 can be fixed by spot welding or bonding, or steel bars can be laid on the bottom plate 2, and then the steel bar truss 3 is laid on these steel bars and fixed by spot welding or bonding. The contact part between the steel bar truss 3 and the steel cross beam 1 can be fixedly connected by welding.

[0033] At least one fixing steel bar 4 is distributed at the gap between the two upper flanges of the steel cross beam 1 corresponding to the steel bar truss 3, and the length direction of the fixing steel bar 4 is the same as the length direction of the steel cross beam 1. In specific implementation, there are multiple fixing steel bars 4, and the fixing steel bars 4 are laid on the steel bar truss 3 and fixedly connected to the steel bar truss 3 by welding.

[0034] Several shear-resistant suspension bars 5 are distributed along the length direction of the fixing steel bar 4. The middle part of the shear-resistant suspension bar 5 is hung on the fixing steel bar 4, and both of its ends extend downward and penetrate into the interior of the steel cross beam 1, and then are bent to form a bent section. During actual assembly, the shear-resistant suspension bar 5 can be fixedly connected to the fixing steel bar 4 by plastic ties, or can be simply fixed by other bonding methods. The two ends of the shear-resistant suspension bar 5 are bent in opposite directions to form bent sections. Among them, the bent sections of the shear-resistant suspension bar 5 are arc-shaped. The outward bending of both ends of the shear-resistant suspension bar 5 can make the steel cross beam 1 and the reinforced concrete floor slab form an integral body after concrete pouring, improving stability. Concrete is poured into the steel cross beam 1, so that the concrete and the steel bar truss 3 form a reinforced concrete floor slab as a whole, and at the same time the concrete completely covers the steel bar truss 3 and the shear-resistant suspension bar 5. Through the shear-resistant suspension bar 5, the steel cross beam 1 with poured concrete and the reinforced concrete floor slab formed by the steel bar truss 3 as a whole are connected into an integral body. Concrete is also poured on the bottom plate 2, and the concrete on the bottom plate is poured to the upper side of the steel bar truss 3. During the actual pouring process, concrete is poured into the steel cross beam and onto the steel bar truss floor formwork, so that the steel bar truss and the shear-resistant suspension bar are buried in the concrete, and at the same time the poured concrete is vibrated, and wait for the concrete to solidify.

[0035] Example 2: Refer to the appendix Figure 2, the basic structure is the same as that of Embodiment 1, except that both ends of the shear-resistant suspension bar 5 are bent in opposite directions to form bent segments. Among them, the bent segments of the shear-resistant suspension bar 5 are bent at right angles, and the bent segments are parallel to the part of the shear-resistant suspension bar 5 located inside the steel crossbeam. The inward bending of both ends of the shear-resistant suspension bar 5 makes the shape of the shear-resistant suspension bar similar to that of stirrups, which can integrate the steel crossbeam 1 and the reinforced concrete floor slab after concrete pouring, and at the same time improve the shear strength. On the two upper flanges of the steel crossbeam 1, several connecting plates are distributed at intervals along the length direction of the steel crossbeam 1, and both ends of the connecting plate are fixedly connected to the two upper flanges of the steel crossbeam 1 respectively. Both ends of the connecting plate are fixedly connected to the two upper flanges of the steel crossbeam 1 by welding respectively. The connecting plate is used to reinforce the steel crossbeam 1 to prevent the concrete from squeezing the two sides of the steel crossbeam 1 during concrete pouring, thereby causing the steel crossbeam 1 to deform.

[0036] Embodiment 3: Refer to the appendix Figure 3 , the basic structure is the same as that of Embodiment 1, except that both ends of the shear-resistant suspension bar 5 are bent at right angles in opposite directions to form bent segments, and the bent segments extend in a direction perpendicular to the inner wall of the steel crossbeam 1 respectively.

[0037] Embodiment 4: During specific construction, the construction method of the shear-resistant member of the U-shaped steel-concrete composite beam suspension bar includes the following steps:

[0038] (1) According to the construction design requirements, erect the steel crossbeam at the designed position and fix it temporarily;

[0039] (2) Lay a steel bar truss floor formwork under the upper flange of the steel crossbeam, and fixedly connect the bottom plate to the steel crossbeam. The bottom plate can be fixedly connected to the steel crossbeam by welding or angle steel;

[0040] (3) Fix the lower chord steel bars of the steel bar truss to the upper flange of the steel crossbeam. The contact part between the lower chord steel bars of the steel bar truss and the upper flange of the steel crossbeam can be fixedly connected by welding;

[0041] (4) Lay multiple fixing steel bars on the steel bar truss so that at least one fixing steel bar is distributed in the gap between the two upper flanges of the steel crossbeam corresponding to the steel bar truss. The length direction of the fixing steel bar is the same as the length direction of the steel crossbeam. Fix the contact part between the fixing steel bar and the steel bar truss by spot welding. During specific construction, the fixing steel bar and the steel bar truss can also be fixed by bonding;

[0042] (5) Hang several shear-resistant suspension bars on the fixing steel bars corresponding to the gap positions between the two upper flanges of the steel crossbeam, so that both ends of the shear-resistant suspension bars are located inside the steel crossbeam, and fix the shear-resistant suspension bars. The shear-resistant suspension bars can be fixed to the fixing steel bars by plastic ties;

[0043] (6) Pour concrete into the steel cross beam and the steel bar truss floor formwork. Pour the concrete to the designed thickness so that the concrete completely covers the steel bar truss and the shear-resistant hanger bars. Through the shear-resistant hanger bars, the concrete in the steel cross beam and the concrete covering the steel bar truss form an integral whole. At the same time, vibrate the concrete until it is dense, and wait for the concrete to solidify.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the spirit and scope of the present technical solutions shall be covered by the scope of the claims of the present invention.

Claims

1. A shear-resistant member of a U-shaped steel-concrete composite beam hanger bar, comprising a steel cross beam (1) and a steel bar truss floor slab formwork. The steel bar truss floor slab formwork comprises a steel bar truss (3) and a bottom plate (2); characterized in that, The steel cross beam (1) is a U-shaped steel beam. The upper side edges of the two side walls of the steel cross beam (1) are bent and extended towards each other to form upper flanges; the bottom plates (2) are horizontally arranged on both sides of the steel cross beam (1), close to the upper flanges of the steel cross beam (1), and are fixedly connected to the steel cross beam (1); the steel bar truss (3) is laid on the steel cross beam (1), and its length direction is perpendicular to the length direction of the steel cross beam (1). The steel bar truss (3) is fixedly connected at the contact with the steel cross beam (1), and the lower side of the steel bar truss (3) is fixedly connected to the bottom plate; at least one fixing steel bar (4) is distributed at the position corresponding to the gap between the two upper flanges of the steel cross beam (1) on the steel bar truss (3), and the length direction of the fixing steel bar (4) is the same as the length direction of the steel cross beam (1); several shear-resistant hanging bars (5) are distributed along the length direction of the fixing steel bar (4). The middle part of the shear-resistant hanging bar (5) is hung on the fixing steel bar (4), and both ends thereof extend downward and penetrate into the steel cross beam (1), and then are bent to form a bent section; concrete is poured into the steel cross beam (1) to integrally form a reinforced concrete floor slab with the steel bar truss (3); concrete is also poured on the bottom plate (2), and the concrete on the bottom plate (2) is poured to the upper side of the steel bar truss (3). The bottom plate (2) is located below the upper flange of the steel cross beam (1). Both ends of the shear-resistant hanging bar (5) are bent towards each other or in opposite directions to form a bent section.

2. The U-shaped steel-concrete composite beam hanger shear-resistant member according to claim 1, characterized in that, Several connecting plates are distributed at intervals along the length direction of the steel cross beam (1) on the two upper flanges of the steel cross beam (1), and both ends of the connecting plate are fixedly connected to the two upper flanges of the steel cross beam (1).

3. The U-shaped steel-concrete composite beam hanger shear-resistant member according to claim 1, characterized in that, The gap between the two upper flanges of the steel cross beam (1) is not less than 60 mm.

4. The shear-resistant member of the suspension bar of the U-shaped steel-concrete composite beam according to claim 1, characterized in that, The steel cross beam (1) is a cold-formed U-shaped steel beam or a welded U-shaped steel beam.

5. A construction method of the shear-resistant member of the U-shaped steel-concrete composite beam stirrup as described in any one of claims 1 to 4, characterized in that, It includes the following steps: (1) According to the construction design requirements, the steel cross beam is erected at the designed position and temporarily fixed. (2) The steel bar truss floor formwork is laid below the upper flange of the steel cross beam, and the bottom plate is fixedly connected to the steel cross beam. (3) The lower chord steel bars of the steel bar truss are fixedly connected to the upper flange of the steel cross beam. (4) A plurality of fixing steel bars are laid on the steel bar truss, so that at least one fixing steel bar is distributed at the position corresponding to the gap between the two upper flanges of the steel cross beam on the steel bar truss. The length direction of the fixing steel bar is the same as the length direction of the steel cross beam, and the fixing steel bar is fixedly connected to the steel bar truss. (5) Several shear-resistant hanging bars are hung on the fixing steel bars corresponding to the gap position between the two upper flanges of the steel cross beam, so that both ends of the shear-resistant hanging bars are located inside the steel cross beam, and the shear-resistant hanging bars are fixed. (6) Concrete is poured into the steel cross beam and the steel bar truss floor formwork, and the concrete is poured to the designed thickness, so that the concrete completely covers the steel bar truss and the shear-resistant hanging bars, and at the same time the concrete is vibrated and compacted, and it can be left until the concrete solidifies.

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