A warehouse-strengthened steel box combined assembly type floor beam and floor system

Abstract

The application relates to the technical field of building structures, and particularly discloses a warehouse-divided reinforced steel box combined fabricated floor beam, which comprises a steel box, warehouse-divided steel partition plates, end plates and longitudinal short steel bars. The steel box is formed by welding a steel plate to enclose a closed cavity, the warehouse-divided steel partition plates are fixed in the steel box to divide the cavity of the steel box into independent concrete warehouses, the end plates are fixed at two ends of the steel box, and the longitudinal short steel bars are fixed between two adjacent warehouse-divided steel partition plates in the middle of the steel box. The patent aims to solve the problems that the existing steel-concrete beams have deficiencies in the constraint and slip limitation of internal concrete, cannot fully exert the mechanical properties of materials, and are prone to local buckling of steel and insufficient compression capacity of concrete.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a modular prefabricated floor beam and floor system with reinforced steel box girder. Background Technology

[0002] In the field of building engineering, floor beams, as a crucial component of building structures, have a vital impact on the stability and construction efficiency of the entire building through their performance and construction methods. With the continuous development of the construction industry, the requirements for floor beams are becoming increasingly stringent. They not only need to possess excellent mechanical properties to bear various loads, but also need to consider the convenience and economy of construction. Traditional floor beam technology has met the basic needs of buildings to a certain extent, but with the expansion of building scale and the diversification of building forms, higher challenges are posed to the performance and construction methods of floor beams. At the same time, how to fully utilize the mechanical properties of materials and improve the load-bearing capacity and stability of floor beams is also a direction that the construction field is constantly exploring.

[0003] CN221941753U discloses a novel precast assembled steel plate concrete composite beam, comprising a perforated thin-walled steel plate box with openings at both ends and a concrete beam body. The perforated thin-walled steel plate box with openings at both ends is formed by cold bending and rolling of perforated thin steel plates and then spliced ​​by welding to form a hollow steel plate box with openings at both ends and openings around the perimeter. The hollow steel plate box is filled with concrete and encased in concrete, resulting in a novel precast assembled steel plate concrete composite beam component. Existing technologies use a single, interconnected cavity without lateral restraint, placing the concrete under uniaxial compression; furthermore, the use of only thin-walled steel plate boxes makes the steel plate prone to buckling in the mid-span region, with bending resistance entirely dependent on the externally encased concrete.

[0004] The shortcomings of existing technologies are that steel-concrete composite beams are insufficient in terms of internal concrete restraint and slip restriction, which prevents them from fully utilizing the mechanical properties of the materials and makes them prone to local buckling of the steel. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a modular prefabricated floor slab beam with reinforced steel box girder, which solves the problems of insufficient internal concrete constraint and slip restriction in existing steel-concrete composite beams, which cannot fully utilize the mechanical properties of the material and are prone to local buckling of the steel.

[0006] The technical solution adopted in this utility model is: a modular prefabricated floor slab beam with reinforced steel box girder, including a steel box body, modular steel partitions, end plates, and longitudinal short steel bars; the steel box body is formed by welding multiple steel plates together, and the steel box body has holes only on its upper surface; the modular steel partitions are arranged perpendicular to the length direction of the steel box body and fixed inside the steel box body, dividing the cavity of the steel box body into independent concrete compartments; the end plates are fixed at both ends of the steel box body; the longitudinal short steel bars are fixed in the middle of the bottom plate of the steel box body and located between two adjacent modular steel partitions.

[0007] Compared with existing technologies, the beneficial effects of this solution are as follows: 1. This solution uses compartmentalized steel partitions to divide the inner cavity of the steel box into independent concrete chambers, preventing concrete from sliding along the beam length direction; the steel box wall and partitions jointly constrain the lateral deformation of the concrete, forming a three-dimensional constraint system, which improves the compressive strength of the concrete; 2. This solution sets longitudinal short steel bars between adjacent partitions in the middle of the span, and the longitudinal short steel bars are fixed to the compartmentalized steel partitions to form a local steel reinforcement skeleton, which makes up for the shortcomings of existing thin-walled steel plate boxes, where the steel plate in the middle of the span is prone to buckling.

[0008] Furthermore, the holes are rectangular in shape and are arranged sequentially along the length of the steel box.

[0009] Furthermore, the end plate is provided with connecting bolt holes.

[0010] Furthermore, the steel box body is made of single-sided hot-rolled patterned steel plate, with the patterned side of the single-sided hot-rolled patterned steel plate facing the inside of the steel box body, and the pattern shape is rhomboid, lentil-shaped, round bean-shaped or a combination of shapes.

[0011] Furthermore, the compartment steel partition is made of double-sided hot-rolled patterned steel plate, and the pattern shape is rhomboid, lentil-shaped, round bean-shaped or a combination of these shapes.

[0012] Furthermore, the bottom surface of the steel box is provided with an anchoring structure perpendicular to the length direction of the steel box. The anchoring structure consists of regularly arranged trapezoidal cross-section ribs, and the cross-section of the anchoring structure is an isosceles trapezoid with an arched top surface.

[0013] Furthermore, the compartment-reinforced steel box composite prefabricated floor beams are combined in a crisscross manner to form a grid-like composite beam floor system. The composite beam floor system includes main beams, secondary beams, node connection components, and concrete slabs. The main beams and secondary beams adopt compartment-reinforced steel box composite prefabricated floor beams. The cross-sectional dimensions of the secondary beams are smaller than those of the main beams. At the intersection of the main beams and secondary beams, the end plates of the secondary beams are connected to the side of the steel box of the main beams through node connection components, and the top surface of the secondary beams is at the same level as the top surface of the main beams.

[0014] Furthermore, the node connection component adopts a node plate, which is rectangular in shape and has the same thickness as the web of the main beam. The node plate is drilled with a group of bolt holes, which are precisely aligned with the connecting bolt holes on the end plate of the secondary beam, and the connection is made by bolts passing through the group of bolt holes.

[0015] Furthermore, the node connection component adopts a connection box, which is a hollow box-shaped structure formed by welding a bottom plate, two side plates and a top plate. The width of the side plate is larger than the width of the secondary beam, and the height of the side plate is the same as the height of the web of the main beam. The side plate is welded to the web of the main beam, and the web and flange of the secondary beam are connected to the side plate of the connection box around the perimeter by fillet weld.

[0016] Furthermore, the node connection components are directly connected by bolts. Several bolt holes are symmetrically opened on both sides of the main beam side compartment steel grating, and the position and size of the bolt holes correspond one-to-one with the connecting bolt holes on the end plate of the secondary beam. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Example 1.

[0018] Figure 2 This is a cross-sectional schematic diagram of Example 1.

[0019] Figure 3 This is a cross-sectional schematic diagram of Example 3. Figure 4 This application presents a schematic diagram of the connection structure of a four-node plate.

[0020] Figure 5 This application presents a detailed diagram of the node plate structure in Embodiment 4.

[0021] Figure 6 This application presents a schematic diagram of the connection structure of the connecting box in Embodiment 4.

[0022] Figure 7 This application presents a detailed drawing of the connecting box structure in Embodiment 4.

[0023] The reference numerals in the accompanying drawings include: 1 steel box body; 2 compartmentalized steel partition; 3 end plate; 31 connecting bolt hole; 4 longitudinal short steel bar; 5 anchoring structure; 6 main beam; 7 secondary beam; 81 node plate; 812 bolt hole group; 82 connecting box; 821 top plate; 822 side plate; 823 bottom plate. Detailed Implementation

[0024] The following is a further detailed description of this application. Example

[0025] As attached Figures 1-2As shown: The modular reinforced steel box girder assembly provided in this application includes a steel box 1, modular steel partitions 2, end plates 3, and longitudinal short reinforcing bars 4. The steel box 1 is formed by welding steel plates to create a closed cavity. The modular steel partitions 2 are fixed inside the steel box 1, dividing the cavity into independent concrete compartments. The end plates 3 are fixed at both ends of the steel box 1. The longitudinal short reinforcing bars 4 are fixed in the middle of the bottom plate of the steel box 1, located between two adjacent modular steel partitions 2. This structural design allows the floor girder to fully utilize the mechanical properties of the materials, improving its load-bearing capacity and stability, while also facilitating construction.

[0026] Specifically, the steel box 1 is constructed by welding multiple steel plates together. The steel plates are made of high-strength steel to ensure the strength and rigidity of the box 1. Common welding methods such as electric arc welding are used to ensure a strong connection between the steel plates. The steel box 1 has holes only on its upper surface. The holes are rectangular in shape and arranged sequentially along the length of the box 1. The holes are formed by machining or laser cutting. Alternatively, the holes can be circular, elliptical, or other shapes, as long as they meet the requirements for inserting reinforcing bars during construction.

[0027] Specifically, the compartmentalized steel partitions 2 are arranged perpendicular to the length of the steel box 1. The compartmentalized steel partitions 2 are welded and fixed inside the steel box 1, dividing the cavity of the steel box 1 into multiple independent concrete compartments. This effectively restricts concrete slippage, constrains the concrete by the surrounding steel plates, and strengthens the concrete's compressive strength. Simultaneously, the design of the double-sided hot-rolled checkered steel plates enhances the mechanical interlocking and bonding force between the compartmentalized steel partitions and the internal filling concrete. In some special designs, the compartmentalized steel partitions 2 can also be arranged at other angles, but a perpendicular arrangement generally performs better. For example, when the floor beam is inclined, the load direction is not perpendicular to the beam axis; in this case, the compartmentalized steel partitions 2 can be arranged inclined along the length of the steel box 1.

[0028] Specifically, end plates 3 are fixed to both ends of the steel housing 1 and are connected to the steel housing 1 by welding. End plates 3 are provided with connecting bolt holes 31 for subsequent connection with other structural components.

[0029] Specifically, the longitudinal short reinforcing bars 4 are fixed in the middle of the bottom plate of the steel box girder 1, located between two adjacent compartment partitions 2. Their function is to increase the bending resistance of the beam at mid-span. Under different design requirements, the number and diameter of the longitudinal short reinforcing bars 4 can be adjusted according to specific mechanical calculations.

[0030] The implementation principle of this embodiment is as follows: the prefabricated floor slab beam with reinforced steel box girder fully combines the advantages of steel and concrete. The steel box girder 1, as the main structure, provides excellent rigidity and strength. The compartmentalized steel partitions 2 divide the concrete compartments, restricting concrete slippage and enhancing the concrete's compressive strength. Simultaneously, the concrete provides support for the steel plates, preventing local buckling of the steel. Holes facilitate the insertion of reinforcing bars, ensuring the coordinated operation of the concrete flanges and the steel box girder. Longitudinal short reinforcing bars 4 increase the beam's mid-span bending resistance. Compared to existing floor slab beams, the prefabricated floor slab beam improves the structural mechanical properties; furthermore, the steel box girder 1 can be used as formwork, shortening the construction period and reducing construction costs, demonstrating strong practicality and innovation. Example

[0031] The difference between this embodiment and Embodiment 1 is that this embodiment uses a single-sided hot-rolled patterned steel plate to make the steel box 1, while the compartment steel partition 2 uses a double-sided hot-rolled patterned steel plate. The raised patterns on the surface of the hot-rolled patterned steel plate enhance the mechanical interlocking and bonding force with the concrete.

[0032] Specifically, the steel box body 1 is welded together from multiple single-sided hot-rolled patterned steel plates. The patterned side of the single-sided hot-rolled patterned steel plate faces the inside of the steel box body 1. The pattern shape adopts rhombus, lentil, round bean or combination shape, and the pattern height meets the pattern height requirements specified in Table 2 of GB / T33974—2017. Example

[0033] As attached Figure 3 As shown: An anchoring structure 5 is also provided on the bottom surface of the steel box 1, perpendicular to its length. The anchoring structure 5 enhances the mechanical interlocking and bonding force between the steel box 1 and the internal filling concrete, ensuring that they form a cohesive whole for load-bearing. The anchoring structure 5 consists of regularly arranged trapezoidal cross-section ribs, with a cross-section that is an isosceles trapezoid with an arched top surface. The sloping trapezoidal surface design facilitates the flow and filling of concrete during pouring, reducing air pockets; the arched top surface provides effective bearing capacity, while the anchoring structure 5 enhances the mechanical interlocking and bonding force between the steel box 1 and the internal filling concrete. Example

[0034] As attached Figures 4-7 As shown in the figure, this application embodiment also provides an open-cell reinforced steel box composite prefabricated floor system. The system is composed of multiple compartment reinforced steel box composite prefabricated floor beams combined in a crisscross manner to form a grid-like composite beam floor system, including main beams 6, secondary beams 7, node connection components and concrete slabs (not shown in the figure).

[0035] Specifically, both the main beam 6 and the secondary beam 7 adopt a modular prefabricated floor slab structure with reinforced steel box girder sections, and the cross-sectional dimensions of the secondary beam 7 are smaller than those of the main beam 6. The main beam 6 and the secondary beam 7 are rigidly connected at their intersection by node connection components. The node connection components are node plates 81 or connection boxes 82, which are connected to the side of the steel box 1 of the main beam 6 by bolts or welding, ensuring that the top surface of the secondary beam 7 is on the same horizontal plane as the top surface of the main beam 6, thus ensuring reliable force transmission in the node area and overall coordinated operation.

[0036] Specifically, the concrete slab is placed on the surface of the beam grid formed by the crisscrossing floor beams. The concrete slab can be prefabricated in the factory along with the floor beams, or it can be poured on site with formwork erected.

[0037] Specifically, the node connection components are key parts for achieving reliable connection between longitudinal and transverse beams, and mainly adopt three forms: node plate 81, connection box 82, and direct bolt connection.

[0038] As attached Figures 4-5 As shown, when using gusset plate 81, gusset plate 81 is rectangular in shape and its thickness is the same as the web thickness of the main beam 6. The gusset plate 81 is cut by milling or laser cutting to ensure smooth edges. The gusset plate 81 has pre-drilled bolt hole groups 812 according to connection requirements. The hole positions are precisely positioned using a CNC drilling machine to ensure accurate alignment with the connecting bolt holes 31 on the end plate 3 of the secondary beam 7. During connection, bolt hole groups 812 matching those of the gusset plate 81 are opened at predetermined positions on the web of the main beam 6. Then, the end plate 3 of the secondary beam 7 is pressed tightly against the gusset plate 81, bolts are passed through the corresponding bolt hole groups 812, and preload is applied, thereby achieving a rigid connection between the main beam 6 and the secondary beam 7.

[0039] As attached Figures 6-7 As shown, when the connecting box 82 is used, it is a hollow box-shaped structure formed by welding a bottom plate 823, two side plates 822, and a top plate 821. The width of the side plates 822 is larger than the width of the secondary beam 7, and the height of the side plates 822 is the same as the height of the web of the main beam 6. During installation, the connecting box 82 is first fitted onto the predetermined node position of the main beam 6, and the side plates 822 of the connecting box 82 are welded to the web of the main beam 6. Subsequently, the end of the secondary beam 7 is joined to the side plates 822, and after adjustment, the web and flange of the secondary beam 7 are connected to the side plates 822 of the connecting box 82 around the perimeter by fillet welding, forming a rigid node with high strength and high rigidity. Compared with the connection of the node plate 81, the connecting box 82 uses welding, which eliminates the need to drill holes in the web of the main beam 6, thus reducing damage to the web of the main beam 6; at the same time, the end plate 3 of the secondary beam 7 does not need to be provided with connecting bolt holes 31.

[0040] When direct bolt connection is used, several bolt holes are pre-drilled on the side of the main beam 6, symmetrically positioned on both sides of the compartment steel partition 2. The position and size of these bolt holes correspond one-to-one with the connecting bolt holes 31 on the end plate of the secondary beam 7, and the secondary beam 6 is connected to the main beam 7 by bolts. The compartment steel partition 2 also serves as a stiffening rib, which can increase the stiffness and bending resistance of the main beam 7 at this connection, ensuring that the joint connection will not undergo excessive deformation or damage under stress.

[0041] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A modular prefabricated floor slab beam with reinforced steel box girder, characterized in that: It includes a steel box body, compartmentalized steel partitions, end plates, and longitudinal short reinforcing bars; the steel box body is welded together from multiple steel plates, and the steel box body has holes only on its upper surface; the compartmentalized steel partitions are arranged perpendicular to the length direction of the steel box body and are fixed inside the steel box body, dividing the cavity of the steel box body into independent concrete compartments; the end plates are fixed at both ends of the steel box body; the longitudinal short reinforcing bars are fixed in the middle of the bottom plate of the steel box body and are located between two adjacent compartmentalized steel partitions.

2. The prefabricated floor slab beam according to claim 1, characterized in that: The holes are rectangular in shape and are arranged sequentially along the length of the steel box.

3. The prefabricated floor slab beam according to claim 1, characterized in that: The end plate is provided with connecting bolt holes.

4. The prefabricated floor slab beam according to claim 1, characterized in that: The steel box body is made of single-sided hot-rolled patterned steel plate, with the patterned side of the single-sided hot-rolled patterned steel plate facing the inside of the steel box body. The pattern shape is rhomboid, lentil-shaped, round bean-shaped or a combination of shapes.

5. The prefabricated floor slab beam according to claim 1, characterized in that: The compartment steel partition is made of double-sided hot-rolled patterned steel plate, and the pattern shape is rhomboid, lentil-shaped, round bean-shaped or a combination of these shapes.

6. The prefabricated floor slab beam according to claim 1, characterized in that: The bottom surface of the steel box is provided with an anchoring structure perpendicular to the length direction of the steel box. The anchoring structure consists of regularly arranged trapezoidal cross-section ribs, and the cross-section of the anchoring structure is an isosceles trapezoid with an arched top surface.

7. The composite beam-floor system formed by prefabricated floor beams according to claim 1, characterized in that: It includes main beams, secondary beams, node connection components and concrete slabs. The main beams and secondary beams are prefabricated floor slab beams. The cross-sectional dimensions of the secondary beams are smaller than those of the main beams. At the intersection of the main beams and secondary beams, the end plates of the secondary beams are connected to the side of the steel box of the main beams through node connection components, and the top surface of the secondary beams is at the same level as the top surface of the main beams.

8. The composite beam floor system according to claim 7, characterized in that: The node connection component adopts a node plate, which is rectangular in shape and has the same thickness as the web of the main beam. The node plate is drilled with a group of bolt holes, which are precisely aligned with the connecting bolt holes on the end plate of the secondary beam. The connection is achieved by bolts passing through the group of bolt holes.

9. The composite beam floor system according to claim 7, characterized in that: The node connection component adopts a connection box, which is a hollow box-shaped structure formed by welding a bottom plate, two side plates and a top plate. The width of the side plate is larger than the width of the secondary beam, and the height of the side plate is the same as the height of the web of the main beam. The side plate is welded to the web of the main beam, and the web and flange of the secondary beam are connected to the side plate of the connection box around the perimeter by fillet weld.

10. The composite beam floor system according to claim 7, characterized in that: The node connection components are directly connected by bolts. Several bolt holes are opened symmetrically on both sides of the main beam side compartment steel grating. The position and size of the bolt holes correspond one-to-one with the connecting bolt holes on the end plate of the secondary beam.

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