Concrete-steel reinforced composite beam with bracket and connecting joint of concrete-steel reinforced composite beam and floor slab
By welding closed stirrups on the H-shaped steel web and filling concrete to form prefabricated beef legs, the problem of steel beams not being able to make full use of the small section high bearing capacity caused by the difference in connection between the steel beam and the floor slab is solved, and the net high lifting and cost reduction of the beam bottom is achieved.
Patent Information
- Application Number
- CN202510368505.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2025-07-29
AI Technical Summary
In existing buildings, the difference in connection between steel beams and floor slabs causes steel beams to be unable to fully utilize the advantages of small sections and high bearing capacity, and increase the amount of steel used, resulting in a decrease in economic efficiency.
A concrete steel bone combination beam with beef legs is used to create beef legs by opening penetrating holes on the H-shaped steel web and welding closed stirrups to form beef legs. Combining connecting rod steel bars and structural steel bars, precast concrete is filled to form precast beef legs, achieving lateral connection with the floor slab and enhancing load bearing capacity.
It significantly improves the net height of the beam bottom, reduces the amount of steel, reduces the manufacturing cost, and improves the bearing capacity and economicality of the steel beam.
Smart Images
Figure CN120384610A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of prefabricated buildings, and particularly to a concrete-steel composite beam with a bracket and a connection node with a floor slab. Background Art
[0002] In existing buildings, the connection positions between different beams and floor slabs are usually different. For example, a concrete beam is usually connected to a floor slab on the side, while the connection between a steel beam and a floor slab is mainly divided into Figure 1 and Figure 2 two connection methods. Figure 1 In , the bottom of the floor slab 1 is connected to the top of the steel beam 2. Figure 2 In , the top of the steel beam 2 is lower than the bottom of the floor slab 1. When the floor slab 1 and the steel beam 2 are connected on the side, transverse stiffeners 3 and longitudinal stiffeners 4 need to be added to the steel beam 2, resulting in a significant increase in the steel consumption and a decrease in economy.
[0003] Under the same stress conditions, compared with a concrete beam, the beam height of a steel beam can be reduced by 150 mm to 200 mm, which is very beneficial for increasing the storey height. Therefore, steel beams are becoming more and more popular in prefabricated buildings. However, due to the differences in the connection methods between steel beams and floor slabs in the prior art, the heights of the beam bottoms of different connection structures are basically the same. Therefore, the advantages of a small cross-section and high bearing capacity of the steel beam cannot be exerted. Summary of the Invention
[0004] The present invention first discloses a concrete-steel composite beam with a bracket, which is prefabricated in a factory. Compared with a steel beam, it has stronger bearing capacity, helps to reduce the cross-section of the steel beam, and can achieve the purpose of significantly increasing the net height of the beam bottom.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A concrete-steel composite beam with a bracket includes an H-shaped steel. Two rows of steel bar passing holes are opened on the web of the H-shaped steel. Steel bars pass through the two rows of steel bar passing holes and are welded into a closed stirrup as the bracket stirrup. The width of the bracket stirrup in the direction perpendicular to the web is greater than the width of the flange of the H-shaped steel. The upper and lower flanges of the H-shaped steel are fixedly connected by connecting steel bars. Construction steel bars are arranged in the length direction of the beam perpendicular to the connecting steel bars. The construction steel bars are respectively tied and fixed to the connecting steel bars and the bracket stirrup. Screws are arranged at intervals in the length direction of the beam at the positions of the bracket stirrup on both sides of the web. The screws are parallel to the connecting steel bars. Sealing plates are respectively welded at both ends of the H-shaped steel on both sides of the web. The sealing plates are perpendicular to the web and the flange respectively. The construction steel bars are welded to the sealing plates. Prefabricated concrete is filled between the two ends of the web on both sides, so that the prefabricated concrete covers the bracket stirrup and the lower half of the screw therein, and the upper half of the screw is exposed outside the prefabricated concrete. The prefabricated concrete at the position of the bracket stirrup forms a prefabricated bracket.
[0006] Furthermore, a bottom end plate is welded to the bottom end of the screw rod embedded in the precast concrete, and the cross-section of the end plate is larger than that of the screw rod.
[0007] Furthermore, the spacing of the screw rods is 200 mm to 250 mm.
[0008] The present invention also discloses a connection node between the concrete steel composite beam with a corbel and the cast-in-place floor slab, which includes a concrete steel composite beam with a corbel and a bottom plate. The bottom plates are respectively placed on the precast corbels at both ends. Bottom steel bars and top steel bars perpendicular to the web direction of the H-shaped steel are respectively arranged above the bottom plate. The bottom steel bars extend to the root of the precast corbel, and the top steel bars are located above the upper flange of the H-shaped steel. The steel bars in the upper part of the bottom plate are tied and fixed, and concrete is cast in the upper part of the bottom plate. The cast-in-place concrete covers the screw rods and the top steel bars, so that the distance between the upper flange of the H-shaped steel and the top elevation of the cast-in-place concrete is ≥ 50 mm.
[0009] The present invention also discloses a connection node between the concrete steel composite beam with a corbel and the composite floor slab, which includes a concrete steel composite beam with a corbel and a precast composite slab. Reserved holes are opened at the edges of the precast composite slab. The precast composite slabs are respectively placed on the precast corbels at both ends. The laying length of the precast composite slab on the precast corbel is ≥ 50 mm. The screw rods pass through the reserved holes of the precast composite slab. Top steel bars are arranged above the precast composite slab. Concrete is cast in the upper part of the precast composite slab. The cast-in-place concrete covers the screw rods and the top steel bars, so that the distance between the upper flange of the H-shaped steel and the top elevation of the cast-in-place concrete is ≥ 50 mm.
[0010] The present invention also discloses a connection node between the concrete steel composite beam with a corbel and the fully precast floor slab, which includes a concrete steel composite beam with a corbel and a fully precast floor slab. Reserved holes are opened at the edges of the fully precast floor slab. The fully precast floor slabs are respectively placed on the precast corbels at both ends. The top surface of the fully precast floor slab is flush with the upper flange of the H-shaped steel. The screw rods pass through the reserved holes of the fully precast floor slab. Grouting material is injected into the reserved holes, and the top of the reserved holes in the grouting material is sealed with mortar. The top surface of the upper flange of the H-shaped steel is coated with fireproof coating.
[0011] The present invention utilizes the space on both sides of the web of the steel beam, fills the concrete in the factory to form precast corbels, further improves the bearing capacity of the steel beam through the combination of concrete and the steel beam, reduces the cross-section of the steel beam, forms the precast corbels and realizes the lateral connection between the steel beam and the floor slab, achieving the purpose of significantly increasing the clear height of the bottom of the steel beam. The precast corbels are composed of steel bars and concrete. Compared with the structure that additional stiffening plates need to be added for the lateral connection between the steel beam and the floor slab in the prior art, the manufacturing cost can be greatly reduced. Description of the Drawings
[0012] Figure 1 It is a schematic diagram of the beam-top connection structure between the floor slab and the steel beam in the prior art; Figure 2 Schematic diagram of the connection structure where the bottom of the floor slab is lower than the top of the steel beam in the prior art; Figure 3 Schematic diagram of the concrete - steel composite beam with a corbel in the embodiment; Figure 4 Schematic diagram of the connection node between the concrete - steel composite beam with a corbel and the cast - in - place floor slab; Figure 5 Schematic diagram of the connection node between the concrete - steel composite beam with a corbel and the composite floor slab; Figure 6 Schematic diagram of the connection node between the concrete - steel composite beam with a corbel and the fully precast floor slab; Figure 7 Schematic diagram of the connection node between the concrete - steel composite beam with a corbel and the steel column.
[0013] Reference numerals: 1, floor slab; 2, steel beam; 3, transverse stiffening plate; 4, longitudinal stiffening plate; 5, flange; 6, web; 7, rebar - passing hole; 8, corbel stirrup; 9, structural steel bar; 10, precast corbel; 11, screw; 12, end plate; 13, connecting rebar; 14, precast concrete; 15, bottom - plate steel bar; 16, top - plate steel bar; 17, cast - in - place concrete; 18, precast composite slab; 19, reserved hole; 20, fully precast floor slab; 21, grouting material; 22, mortar; 23, fire - proof coating. Detailed implementation manners
[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.
[0015] This embodiment discloses a concrete - steel composite beam with a corbel. The composite beam is a factory - precast beam, and its structure is as Figure 3 shown. The steel skeleton inside the composite beam is an H - shaped steel. Two rows of upper and lower rebar - passing holes 7 are opened along the length direction of the web 6 of the H - shaped steel. One steel bar is inserted into each group of upper and lower corresponding rebar - passing holes 7, and the steel bars are respectively passed through the upper and lower rebar - passing holes 7 and bent and welded into a closed stirrup, and this closed stirrup serves as the corbel stirrup 8. To Figure 3Taking the shown direction as a reference, the transverse width of the bracket stirrup 7 is greater than the transverse width of the H-beam flange 5, so that after pouring concrete at the bracket stirrup 7, a precast bracket 10 can be formed here. Vertical connecting bar reinforcements 13 are respectively arranged at intervals on both sides of the web 6 of the H-beam. The upper and lower ends of the connecting bar reinforcements 13 are respectively welded to the upper and lower flanges. Construction reinforcements 9 are arranged in the direction perpendicular to the connecting bar reinforcements 13 and along the length of the beam, and the construction reinforcements 9 are respectively tied and fixed to the connecting bar reinforcements 13 and the bracket stirrup 8 at the corresponding positions. Screws 11 are arranged at intervals along the length of the beam at the positions of the precast brackets 10 on both sides of the web 6. The screws 11 are parallel to the connecting bar reinforcements 13. The spacing of the screws 11 on the same side is 200 mm to 250 mm. The bottom end of the screw 11 is welded with an end plate 12, and the cross-section of the end plate 12 is larger than the cross-section of the screw 11. At both ends of the H-beam, sealing plates 25 are respectively arranged on both sides of the web 6. The sealing plates 25 are perpendicular to the web 6. The inner side of the sealing plates 25 is welded to the web 6. The top end of the sealing plates 25 is welded to the upper flange, and the lower end of the sealing plates 25 is welded to the lower flange. The construction reinforcements 9 are welded to the sealing plates 25. A section of distance is left from the sealing plates 25 to the end of the H-beam, and bolt holes are opened on the left-behind web 6 (reference can be made to Figure 7 ), and its purpose is to facilitate the connection with the steel column 24. After the above structural connections are completed, precast concrete 14 is filled in the area between the two end sealing plates 25 on both sides of the web 6. The precast concrete 14 covers the entire bracket stirrup 8 and the lower half of the screw 11. The upper half of the screw 11 is exposed outside the precast concrete 14. The precast concrete 14 at the position of the bracket stirrup 8 is the precast bracket 10. The setting of the sealing plates 25 can be used to fix the construction reinforcements 9 and can also act as a formwork when pouring concrete.
[0016] Based on the above concrete-encased steel composite beam with brackets, its connection node with the cast-in-place floor slab is as shown in Figure 4 . At each of the two end precast brackets 10, a bottom plate is placed, and concrete reinforcements are respectively arranged above the bottom plates. Among them, the bottom plate reinforcement 15 perpendicular to the web 6 of the H-beam and located at the lower part and the top plate reinforcement 16 located at the upper part. The bottom plate reinforcement 15 needs to extend to the root of the precast bracket 10 to meet the steel bar anchorage length. The distance from the upper flange of the H-beam to the top surface elevation of the cast-in-place concrete is ≥ 50 mm, and its purpose is to facilitate the setting of the top plate reinforcement 16, that is, the top plate reinforcement 16 is higher than the upper flange of the H-beam. All the reinforcements at the upper part of the bottom plate are tied and fixed, and then cast-in-place concrete 17 is poured at the upper part of the bottom plate, so that the cast-in-place concrete 17 covers the screw 11 and the top plate reinforcement 16.
[0017] Based on the concrete-encased steel composite beam with brackets in this embodiment, its connection node with the composite floor slab is as shown in Figure 5As shown in the figure, a precast corbel 10 is respectively placed on both ends, and a precast composite slab 18 is placed on each precast corbel 10. Reserved holes 19 are opened near the edge of each precast composite slab 18. When placing the precast composite slab 18, let the screw rod 11 pass through the reserved hole 10, and make the laying length of the precast composite slab 18 on the precast corbel 10 ≥ 50 mm, and make the elevation of the upper flange of the H-shaped steel from the top surface of the cast-in-place concrete 17 ≥ 50 mm, which is convenient for the passing of the top slab reinforcement 16, that is, the top slab reinforcement 16 is higher than the upper flange of the H-shaped steel. Reinforcement bars arranged vertically and horizontally are provided on the upper part of the precast composite slab 18, and among them, the reinforcement bar perpendicular to the connecting bar reinforcement 13 direction is the top slab reinforcement 16. All the reinforcement bars are tied and fixed, and then the cast-in-place concrete 17 is poured on the upper part of the precast composite slab 18, so that the cast-in-place concrete 17 covers the screw rod 11 and the top slab reinforcement 16.
[0018] For the concrete steel composite beam with corbels based on this embodiment, its connection node with the fully precast floor slab is as Figure 6 As shown in the figure, a fully precast floor slab 20 is respectively placed on the precast corbels 10 at both ends. Reserved holes 19 are opened near the edge of each fully precast floor slab 20, and let the screw rod 11 pass through the reserved holes 19 of the fully precast floor slab 20. Grouting material 21 is injected into the reserved holes 19, and the grouting material 21 is used to fill the gap between the reserved hole 10 and the screw rod 11 to ensure the compactness. The top of the grouting material 21 in the reserved hole 19 is sealed with mortar 22 to ensure the surface flatness. Fireproof coating 23 is coated on the top surface of the upper flange of the H-shaped steel to solve the fireproof problem after the upper flange of the steel beam is exposed. After connecting according to this structure, it can be ensured that the top surface of the fully precast floor slab 20 is basically flush with the upper flange of the H-shaped steel.
[0019] In the above composite beam designed in this embodiment, letting the corbel stirrup 8 pass through the web 6 can enhance the composite action between the concrete and the steel beam, and at the same time ensure the anchorage of the reinforcement bars in the concrete. When the composite beam is connected to the floor slab, lateral connection can be adopted. At this time, the corbel stirrup 8 and the precast corbel 10 are the supporting stress-bearing components of the floor slab and bear the vertical load transmitted by the floor slab. The screw rod 11 can increase the common action between the precast corbel 10 and the floor slab, and bear the shear force along the length direction of the steel beam between the floor slab and the steel beam. For the composite floor slab and the fully precast floor slab, the screw rod 11 also has a positioning function. Welding an end plate 12 at the bottom end of the screw rod 11 can strengthen the anchorage effect of the screw rod 11 in the precast corbel 10 and reduce the anchorage depth of the screw rod 11. The structural reinforcement bar 9 is tied with the corbel stirrup 8, which can fix the corbel stirrup 8 and at the same time prevent the concrete surface from cracking. The connecting bar reinforcement 13 is used to restrain the precast concrete 14, and at the same time enhance the composite action between the concrete and the steel beam and restrain the deformation of the steel beam flange 5. The precast concrete 14 can improve the overall bearing capacity of the steel beam, reduce the deformation of the steel beam, and at the same time has the functions of fireproofing and anti-corrosion, eliminating the fireproof coating and anti-corrosion paint on both sides of the steel beam web 6.
[0020] The connection between the concrete-encased steel composite beam with a corbel designed in this embodiment and the steel column 24 can adopt the bolt-welding connection method of traditional steel beams and steel columns. Refer to Figure 7 As shown, bolt holes are provided on the outer side of the composite beam located at the closure plate 25. A connecting steel plate can be set between the composite beam and the steel column 24, and the connection is completed by bolt-welding. If it is necessary to utilize the strength of the concrete in the concrete-encased steel composite beam with a corbel, after the steel beam is connected, it is necessary as Figure 7 As shown, additional construction steel bars 9 and connecting bar steel bars 13 are additionally arranged in the welding connection area, and concrete is cast in the connection area. The cast-in-place concrete in the connection area is used in the case where it is necessary to utilize the concrete to improve the flexural bearing capacity of the beam end of the steel beam. The cast-in-place concrete here does not need to be made into the shape of a corbel because the flexural and shear bearing capacities provided by the corbel at the beam end can be ignored. The formwork support without the corbel form is more convenient on-site, and it is also convenient for laying pipeline in the wall.
[0021] The present invention designs a concrete-encased steel composite beam with a corbel, which can realize the side connection between the floor slab and the steel beam, can leave more clear height under the beam, and give full play to the advantages of the steel structure with a small cross-section and high bearing capacity. Compared with the traditional method of lowering the slab of the steel beam, the concrete-encased steel composite beam with a corbel saves more steel, and the filled concrete can achieve a higher bearing capacity.
[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A concrete-steel composite beam with corbels, comprising an H-shaped steel, characterized in that: Two rows of steel bar passing holes are formed in the web of the H-shaped steel. Steel bars pass through the two rows of steel bar passing holes respectively and are welded into closed stirrups as bracket stirrups. The width of the bracket stirrups perpendicular to the web direction is greater than the width of the flange of the H-shaped steel. The upper and lower flanges of the H-shaped steel are fixedly connected by connecting bar steel bars. Construction steel bars are arranged along the length direction of the beam perpendicular to the connecting bar steel bars. The construction steel bars are respectively tied and fixed to the connecting bar steel bars and the bracket stirrups. Screws are arranged at intervals along the length direction of the beam at the positions of the bracket stirrups on both sides of the web. The screws are parallel to the connecting bar steel bars. Sealing plates are respectively welded at both ends of the H-shaped steel on both sides of the web. The sealing plates are perpendicular to the web and the flange respectively. The construction steel bars are welded to the sealing plates. Prefabricated concrete is filled between the two end sealing plates on both sides of the web, so that the prefabricated concrete covers the bracket stirrups and the lower half of the screws. The upper half of the screws is exposed outside the prefabricated concrete. The prefabricated concrete at the position of the bracket stirrups forms a prefabricated bracket.
2. The composite concrete-steel beam with a bracket according to claim 1, characterized in that: The bottom end of the screw embedded in the prefabricated concrete is welded with an end plate, and the cross-section of the end plate is larger than the cross-section of the screw.
3. A concrete-steel composite beam with corbels according to claim 1, characterized in that: The spacing of the screws is 200mm - 250mm.
4. The connection node between the concrete-encased steel composite beam with bracket and the cast-in-place floor slab is characterized in that: It includes a concrete-encased steel composite beam with brackets as described in any one of claims 1-3 and a bottom plate. The bottom plates are respectively placed on the two end prefabricated brackets. Bottom plate steel bars and top plate steel bars perpendicular to the web direction of the H-shaped steel are respectively arranged above the bottom plates. The bottom plate steel bars extend to the root of the prefabricated brackets. The top plate steel bars are located above the upper flange of the H-shaped steel. The steel bars in the upper part of the bottom plate are tied and fixed. Cast-in-place concrete is poured in the upper part of the bottom plate. The cast-in-place concrete covers the screws and the top plate steel bars, so that the distance between the upper flange of the H-shaped steel and the top surface elevation of the cast-in-place concrete is ≥50mm.
5. The connection node of a concrete-encased steel composite beam with a bracket and a composite floor slab is characterized in that: It includes a concrete-encased steel composite beam with brackets as described in any one of claims 1-3 and a precast composite slab. Reserved holes are formed at the edges of the precast composite slab. The precast composite slabs are respectively placed on the two end prefabricated brackets. The laying length of the precast composite slab on the prefabricated brackets is ≥50mm. The screws pass through the reserved holes of the precast composite slab. Top plate steel bars are arranged in the upper part of the precast composite slab. Cast-in-place concrete is poured in the upper part of the precast composite slab. The cast-in-place concrete covers the screws and the top plate steel bars, so that the distance between the upper flange of the H-shaped steel and the top surface elevation of the cast-in-place concrete is ≥50mm.
6. The connection node of a concrete-encased steel composite beam with a corbel and a fully precast floor slab is characterized in that: It includes a concrete-encased steel composite beam with brackets as described in any one of claims 1-3 and a fully prefabricated floor slab. Reserved holes are formed at the edges of the fully prefabricated floor slab. The fully prefabricated floor slabs are respectively placed on the two end prefabricated brackets. The top surface of the fully prefabricated floor slab is flush with the upper flange of the H-shaped steel. The screws pass through the reserved holes of the fully prefabricated floor slab. Grouting material is injected into the reserved holes. The top of the grouting material in the reserved holes is sealed with mortar. Fireproof coating is applied to the top surface of the upper flange of the H-shaped steel.