Prefabricated and assembled steel truss reinforced concrete floor

Abstract

This invention relates to the field of building engineering technology, specifically to a precast assembled steel truss reinforced concrete floor slab. The floor slab includes a precast reinforced concrete slab extending laterally. A matching precast steel truss is fixedly installed at the lower end of the precast reinforced concrete slab. An overlap is provided between the end of the precast reinforced concrete slab and the corresponding end of the precast steel truss. The precast steel truss includes multiple inverted conical steel frame structures arranged sequentially laterally. The upper ends of the multiple inverted conical steel frame structures are detachably fixed to the lower end of the precast reinforced concrete slab, and the lower ends are connected by a transverse lower chord. Through the structural design combining the precast reinforced concrete slab and the precast steel truss, the precast reinforced concrete slab becomes the overall compression zone, with almost the entire cross-section under compression, while the precast steel truss at the bottom is under tension. This meets the requirements for large-span operations. The flat overlap avoids the complex problems of sealing and treatment. Simultaneously, the detachable fixing of the steel truss and the concrete slab facilitates installation and improves efficiency.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a prefabricated steel truss reinforced concrete floor slab. Background Technology

[0002] The current precast component system in the construction industry has entered a new stage unlike any before. Compared with cast-in-place concrete, precast concrete components have advantages such as reducing the amount of concrete and steel used, reducing the number of workers on the construction site, shortening the construction period, and correspondingly reducing the total cost.

[0003] like Figure 1 As shown, this is a type of precast reinforced concrete floor slab in the prior art. This type of floor slab is mainly used for small-span (less than 6 meters) operations in villas and residences. At the same time, the floor slab is rectangular in shape, with a large thickness and a large self-weight, making it unsuitable for large-span (more than 9 meters) operations.

[0004] like Figure 2 As shown, a double-T-shaped precast reinforced concrete floor slab in the prior art includes an upper flange 1 and two webs 2 arranged at intervals along the width direction of the upper flange. Although it can meet the requirements of large-span operations, the uneven ends of the floor slab make the sealing between the supporting end and the building complicated when it is placed on a room partition or exterior wall. At the same time, the floor slab is heavy and the supporting end is the end of the lower side of the web, with a small supporting end area, which results in high stress at the contact point between the floor slab and the building structure and limited safety.

[0005] Therefore, designing a precast large-span reinforced concrete floor slab that is easy to assemble and has high safety is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a prefabricated steel truss reinforced concrete floor slab. Through the structural design of combining the prefabricated reinforced concrete slab with the prefabricated steel truss, the prefabricated reinforced concrete slab is the whole compression zone, with almost the entire cross section under compression, while the prefabricated steel truss at the bottom is under tension, which meets the requirements of large-span operations. The flat overlapping part avoids the complex problem of sealing and treatment. At the same time, the steel truss and the concrete slab can be detachably fixed, which facilitates installation and improves efficiency.

[0007] To address the aforementioned technical problems, the present invention provides a prefabricated assembled steel truss reinforced concrete floor slab, comprising a prefabricated reinforced concrete slab extending laterally, wherein a matching prefabricated steel truss is fixedly installed at the lower end of the prefabricated reinforced concrete slab, and an overlap is provided between the end of the prefabricated reinforced concrete slab and the corresponding end of the prefabricated steel truss. The prefabricated steel truss includes multiple inverted conical steel frame structures arranged sequentially laterally, wherein the upper ends of the multiple inverted conical steel frame structures are detachably fixedly connected to the lower end of the prefabricated reinforced concrete slab, and the lower ends are connected by a transverse lower chord.

[0008] Furthermore, an internally threaded embedded part is pre-embedded in the precast reinforced concrete slab at the position corresponding to the inverted conical steel frame structure, and the upper end of the inverted conical steel frame structure is fixed to the precast reinforced concrete slab by a fixing bolt that is threadedly engaged with the internally threaded embedded part.

[0009] Furthermore, the upper end of the internally threaded embedded part protrudes from the upper end of the precast reinforced concrete slab.

[0010] Furthermore, an anti-detachment steel plate is provided at the lap joint. The anti-detachment steel plate extends outward from one end facing away from the precast steel truss to form a precast reinforced concrete slab, and an anti-detachment hole is provided at that end. The anti-detachment hole is used to fit onto the corresponding steel column of the building structure.

[0011] Furthermore, the lower end of the anti-falling steel plate is flush with the lower end of the precast reinforced concrete slab.

[0012] Furthermore, two anti-fall-off steel plates are symmetrically arranged along the horizontal longitudinal direction of each overlap.

[0013] Furthermore, the end of the anti-falling steel plate facing the prefabricated steel truss is fixedly connected to the prefabricated steel truss.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) Through the structural design combining precast reinforced concrete slabs and precast steel trusses, on the one hand, the setting of precast steel trusses significantly improves the overall load-bearing capacity of the structure. Combined with the mechanical stability of the inverted conical steel frame structure, it can meet the needs of large-span (over 9 meters) operations, breaking through the application limitations of traditional small-span floor slabs. On the other hand, the combination of precast steel trusses and precast reinforced concrete slabs can significantly reduce the overall self-weight, reduce seismic loads, reduce the amount of materials used in the main structure and foundation, reduce the overall cost, and avoid the problem of heavy self-weight of traditional large-span floor slabs. The pre-reserved overlap at the ends makes the ends of the floor slabs flatter, solving the problem of complicated sealing treatment caused by uneven ends of existing floor slabs, and facilitating assembly construction when placed on the building structure. The inverted conical steel frame structure forms an overall force-bearing system through the connection of the lower chord, enhancing the structural stability and stiffness. The detachable fixed connection between the steel truss and the concrete slab reduces the difficulty of prefabrication and installation, and improves construction efficiency. Precast reinforced concrete slabs and precast steel trusses can be transported separately, i.e., floor slabs are stacked together and trusses are stacked together. They are assembled and hoisted on site as needed, which improves transportation efficiency, reduces transportation costs, saves storage space, and eliminates the need for finished product protection supports. Attached Figure Description

[0016] Figure 1 It is a type of small-span precast reinforced concrete floor slab in existing technology.

[0017] Figure 2 It is a type of large-span, double-T-shaped precast reinforced concrete floor slab in the existing technology.

[0018] Figure 3 This is a first-direction isometric view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0019] Figure 4 This is a second-direction isometric view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0020] Figure 5 This is a front view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0021] Figure 6 This is a side view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0022] Figure 7 This is a top view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0023] Figure 8 This is a schematic diagram of the overall structure of the prefabricated steel truss in Embodiment 1 of the present invention.

[0024] Figure 9This is a frontal structural diagram of the prefabricated steel truss in Embodiment 1 of the present invention.

[0025] Figure 10 This is a schematic diagram of the internal thread embedded part in Embodiment 1 of the present invention.

[0026] Figure 11 This is a first-direction cross-sectional view of the precast reinforced concrete slab in Embodiment 1 of the present invention.

[0027] Figure 12 This is a second-direction cross-sectional view of a prefabricated steel truss reinforced concrete floor slab according to Embodiment 1 of the present invention.

[0028] Figure 13 This is a schematic diagram of a prefabricated steel truss reinforced concrete floor slab installed on a reinforced concrete beam in Embodiment 1 of the present invention.

[0029] Figure 14 This is a schematic diagram of a prefabricated steel truss reinforced concrete floor slab installed on a steel beam in Embodiment 2 of the present invention.

[0030] In the diagram: 1. Precast reinforced concrete slab; 11. Overlap joint; 12. Embedded shear steel plate; 2. Precast steel truss; 21. Inverted conical steel frame structure; 22. Lower chord; 23. Web member; 24. Upper support plate; 25. Round steel pipe; 3. Internally threaded embedded part; 4. Anti-falling steel plate; 41. Anti-falling hole; 5. Reinforced concrete beam; 51. Steel column; 6. Bolt rod; 7. Steel beam; 8. Upper flange; 9. Web plate. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings: Specific Implementation Example 1:

[0033] In this embodiment, as Figure 1 As shown, the horizontal direction is the length direction of the precast reinforced concrete slab 1, and the vertical direction is the width direction of the precast reinforced concrete slab 1.

[0034] refer to Figures 1 to 13This invention discloses a precast assembled steel truss reinforced concrete floor slab (hereinafter referred to as concrete floor slab), comprising a precast reinforced concrete slab 1 extending laterally, wherein a matching precast steel truss 2 is fixedly installed at the lower end of the precast reinforced concrete slab 1, specifically, the lateral center of the precast steel truss 2 coincides with the lateral center of the precast reinforced concrete slab 1. An overlap portion 11 is provided between the end of the precast reinforced concrete slab 1 and the corresponding end of the precast steel truss 2. The precast steel truss 2 includes a plurality of inverted conical steel frame structures 21 arranged sequentially laterally, the upper ends of the plurality of inverted conical steel frame structures 21 being detachably fixedly connected to the lower end of the precast reinforced concrete slab 1, and the lower ends being connected via a lateral lower chord 22.

[0035] Through the structural design combining precast reinforced concrete slab 1 and precast steel truss 2, the precast reinforced concrete slab 1 serves as the overall compression zone, making reasonable use of its compressive but not tensile properties, with almost the entire cross-section under compression. The precast steel truss 2 at the bottom is under tension, making reasonable use of the properties of steel, resulting in a better material combination.

[0036] This design significantly enhances the overall load-bearing capacity of the structure by utilizing the precast steel truss 2. Combined with the mechanical stability of the inverted conical steel frame structure 21, it can meet the requirements of large-span (over 9 meters) operations, breaking through the application limitations of traditional small-span floor slabs. Simultaneously, the combination of the precast steel truss 2 and the precast reinforced concrete slab 1 significantly reduces the overall self-weight, decreases seismic loads, reduces the material usage of the main structure and foundation, lowers the overall cost, and avoids the problem of the heavy self-weight of traditional floor slabs. The pre-reserved overlap 11 at the ends makes the floor slab ends flatter, solving the complex sealing problem caused by unevenness at the ends of existing floor slabs, and facilitating assembly construction when placed on the building structure. The inverted conical steel frame structure 21, connected by the lower chord 22, forms an integrated load-bearing system, enhancing structural stability. The detachable and fixed connection between the steel truss and the concrete slab reduces the difficulty of prefabrication and installation, and improves construction efficiency.

[0037] Preferably, in this embodiment, an internally threaded embedded part 3 is pre-embedded on the precast reinforced concrete slab 1 at the position corresponding to the inverted conical steel frame structure 21, and the upper end of the inverted conical steel frame structure 21 is fixed to the precast reinforced concrete slab 1 by a fixing bolt that is threadedly engaged with the internally threaded embedded part 3.

[0038] Specifically, the inverted conical steel frame structure 21 includes four steel web members 23. The lower ends of the four web members 23 extend towards the center and are welded and fixed to the steel lower chord member 22. The upper ends of the four web members 23 extend outward to form an inverted conical structure. The internally threaded embedded part 3 includes a bottom plate and a cylinder extending upward from the center of the bottom plate. A vertically penetrating internally threaded through hole is provided at the center of the cylinder and the bottom plate.

[0039] like Figure 8 , 9As shown, a circular steel pipe 25 extending vertically along its axis is welded to the upper side of the web member 23. Specifically, the upper end of the web member 23 is cut along the intersection line of the circular steel pipe 25 and welded to the outer periphery of the circular steel pipe 25. An upper support plate is welded to the upper end of the circular steel pipe 25, and the top end of the web member 23 abuts against the lower end face of the upper support plate 24 and is welded to it.

[0040] The upper support plate is provided with mounting holes that correspond to and match the internal threaded embedded part 3. The upper support plate 24 is detachably fixed on the precast reinforced concrete slab 1 by bolt rod 6 passing through the inner hole of the round steel pipe 25 and the mounting hole and screwed into the internal threaded embedded part 3. The bolt rod 6 is also fitted with an anti-loosening washer to prevent loosening and ensure reliable fixing.

[0041] Specifically, in this embodiment, the inverted conical steel frame structures 21 are arranged sequentially in the transverse direction, and the adjacent web members 23 of two adjacent inverted conical steel frame structures 21 are welded and fixed on the same round steel pipe 25 and the same upper support plate 24.

[0042] Preferably, in this embodiment, the upper end of the internally threaded embedded part 3 protrudes from the upper end of the precast reinforced concrete slab 1. This arrangement allows the internally threaded embedded part 3 to be used for hoisting the precast reinforced concrete slab 1.

[0043] In this embodiment, preferably, an anti-falling steel plate 4 is provided at the overlap 11. The end of the anti-falling steel plate 4 facing away from the precast steel truss 2 extends outward from the precast reinforced concrete slab 1, and an anti-falling hole 41 is provided at this end. Figure 11 As shown, during installation, the anti-fall-off hole 41 is used to fit onto the corresponding steel column 51 of the building structure, which facilitates the connection and fixation of the reinforced concrete slab with the building structure. At the same time, the anti-fall-off steel plate 4 and the steel column 51 form an additional limiting and fixing structure, which effectively prevents the risk of the floor slab falling off during the placement process.

[0044] Specifically, in this embodiment, the steel column 51 is a threaded steel column 51. After the anti-falling steel plate 4 overlaps the threaded steel column 51 through its anti-falling hole 41, the fixing nut is screwed onto the steel column 51 to fix the anti-falling steel plate 4.

[0045] In this embodiment, preferably, the lower end of the anti-falling steel plate 4 is flush with the lower end of the precast reinforced concrete slab 1, avoiding the problem of unevenness of the support surface caused by the protruding steel plate, reducing local stress concentration, and improving the stability of the support state. Furthermore, two anti-falling steel plates 4 are symmetrically arranged along the horizontal longitudinal direction on each overlap 11, improving safety.

[0046] Specifically, in this embodiment, such as Figure 12As shown, precast reinforced concrete slab 2 has embedded shear steel plates 12 at both ends. The anti-falling steel plate 4 at one end of the precast reinforced concrete slab 1 is straight, while the anti-falling steel plate 4 at the other end is zigzag. This arrangement ensures... Figure 13 As shown, the building structure in this embodiment is a reinforced concrete beam 5, and the threaded steel column 51 is embedded in the reinforced concrete beam 5. When concrete floor slabs are erected on both sides of the reinforced concrete beam 5, the two opposite zigzag and straight anti-falling steel plates 4 are fitted onto the threaded steel column 51 and can be tightly overlapped together to ensure that the bottom surfaces of the concrete floor slabs on both sides are resting on the reinforced concrete beam, thus ensuring stability.

[0047] Meanwhile, in this embodiment, the end of the anti-falling steel plate 4 facing the prefabricated steel truss 2 is fixedly connected to the prefabricated steel truss 2. Specifically, the end of the anti-falling steel plate 4 facing the prefabricated steel truss 2 is welded and fixed to the lower end of the nearest internally threaded embedded part 3 to form a whole and ensure structural strength.

[0048] The installation process of the concrete floor slab in this application:

[0049] Precast reinforced concrete slab 1 and precast steel truss 2 are prefabricated in the factory and transported to the construction site. During assembly, they are placed on temporary supports and bolted together to fix the precast reinforced concrete slab 1 and precast steel truss 2.

[0050] In actual use, according to the actual needs, screw the lifting eye bolt into the upper end of the internal threaded embedded part 3, and then use the hoisting device to lift the plate to the appropriate floor position.

[0051] A threaded steel column 51 is pre-embedded at the location where the concrete slab is installed in the building structure. The anti-falling hole 41 of the anti-falling steel plate 4 of the concrete floor slab is fitted onto the steel column 51, and then the nut is tightened to fix it, thus completing the installation.

[0052] In this embodiment, the building structure can be a reinforced concrete beam or a steel beam.

[0053] In summary, the concrete floor slab of this invention involves the separate prefabrication of the precast reinforced concrete slab 1 and the precast steel truss 2. These components are then assembled at the construction site. On-site assembly requires only temporary supports on the ground, and the slabs are joined by bolts, resulting in a fast and efficient process. No formwork or curing is needed on-site, leading to a short construction period and low cost.

[0054] Meanwhile, existing large-span floor slabs, due to their integral manufacturing, have a large outer volume, limiting transport capacity to only two to three slabs per vehicle. The precast reinforced concrete slabs and precast steel trusses of this application are manufactured separately, and the precast reinforced concrete slabs are standard rectangular thin sheets, resulting in a smaller volume, allowing for stacking during transport. The lightweight precast steel frame can be stacked individually in a single vehicle or on top of a stack of precast reinforced concrete slabs, saving transport space and increasing the average transport capacity per vehicle by five to ten times, thus improving transport efficiency and reducing costs.

[0055] The concrete floor slab of this invention can achieve spans of over 9 meters while being lighter in weight. Utilizing the flat overlapping portion 11, it can be directly placed on beams or walls without the need for sealing, ensuring uniform stress distribution at the ends and reliable anchoring points to the connecting structure to prevent detachment. On-site secondary construction work is significantly reduced, eliminating the need for additional support systems and shortening the construction cycle. Due to its lightweight design, seismic loads are reduced, decreasing the material usage of the main structure and foundation, thus lowering the overall cost. With no secondary beams, the precast reinforced concrete slab can be fabricated more quickly, allowing equipment pipelines to run close to the bottom of the slab, and enabling a greater floor height.

[0056] Example 2: This example provides a different building structure. Unlike Example 1, in this example, as... Figure 14 As shown, the building structure can also be a steel beam 7, in which case the threaded steel column 51 is welded and fixed to the steel beam 7.

[0057] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0058] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A prefabricated steel truss reinforced concrete floor slab, characterized in that, The device includes a precast reinforced concrete slab extending laterally, with a matching precast steel truss fixedly installed at the lower end of the precast reinforced concrete slab. An overlap is provided between the end of the precast reinforced concrete slab and the corresponding end of the precast steel truss. The precast steel truss includes multiple inverted conical steel frame structures arranged sequentially in the transverse direction. The upper ends of the multiple inverted conical steel frame structures are detachably fixedly connected to the lower end of the precast reinforced concrete slab, and the lower ends of the multiple inverted conical steel frame structures are connected by a transverse lower chord. The precast reinforced concrete slab has internally threaded embedded parts at the positions corresponding to the inverted conical steel frame structure. An anti-detachment steel plate is provided at the lap joint. The anti-detachment steel plate extends outward from the end facing away from the precast steel truss to form a precast reinforced concrete slab, and an anti-detachment hole is provided at this end. The anti-detachment hole is used to fit onto the corresponding steel column of the building structure. Two anti-fall-off steel plates are symmetrically installed along the horizontal longitudinal direction of each lap joint; The inverted conical steel frame structure includes four steel web members. The lower ends of the four web members extend toward the center and are welded and fixed to the steel lower chord. The upper ends of the four web members extend outward to form an inverted conical structure. The internal threaded embedded part includes a bottom plate and a cylinder that extends upward from the center of the bottom plate. A vertically penetrating internal threaded through hole is provided at the center of the cylinder and the bottom plate. A circular steel pipe with its axis extending vertically is welded to the upper side of the web member. The upper end of the web member is cut along the intersection line of the circular steel pipe and welded to the outer periphery of the circular steel pipe. An upper support plate is welded to the upper end of the circular steel pipe. The top end of the web member abuts against the lower end face of the upper support plate and is welded to it. The upper support plate is provided with mounting holes that correspond to and are compatible with the internal threaded embedded parts. The upper support plate is detachably and fixedly installed on the precast reinforced concrete slab by bolts that pass through the inner hole of the round steel pipe and the mounting holes and are screwed and tightened in the internal threaded embedded parts. The inverted conical steel frame structures are arranged sequentially along the transverse direction, and the adjacent web members of two adjacent inverted conical steel frame structures are welded and fixed to the same round steel pipe and the same upper support plate.

2. The prefabricated assembled steel truss reinforced concrete floor slab according to claim 1, characterized in that, The upper end of the internally threaded embedded part protrudes from the upper end of the precast reinforced concrete slab.

3. The prefabricated assembled steel truss reinforced concrete floor slab according to claim 1, characterized in that, The lower end of the anti-falling steel plate is flush with the lower end of the precast reinforced concrete slab.

4. The prefabricated assembled steel truss reinforced concrete floor slab according to claim 1, characterized in that, The end of the anti-falling steel plate facing the precast steel truss is fixedly connected to the precast steel truss.

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