Steel pipe truss component and floor system

Abstract

The utility model relates to a steel pipe truss component and a floor system applying the same, and belongs to the field of building structures. The steel pipe truss member comprises a concrete prefabricated bottom plate, an upper chord steel pipe and a lower single continuously-bent web member arranged in the length direction of the upper chord steel pipe. The web member is a hollow pipe, the whole web member is in a sine wave shape, the upper surface of the top bent position of the web member is welded to the upper chord steel pipe, and the bottom bent position of the web member is embedded in the concrete prefabricated bottom plate. The upper surfaces of the bent positions of the bottoms of the web members are sunken downwards to form containing grooves, and the containing grooves are used for containing embedded steel bars in the concrete prefabricated bottom plate. The connecting structure is simple in structure and convenient to install, the connecting strength of the steel pipe truss and the floor prefabricated bottom plate is improved, and the stability of the whole structure is enhanced.

Description

Technical Field

[0001] This invention relates to the field of building structures, specifically to a steel pipe truss component and its application in floor structures. Background Technology

[0002] With the development of industrialized construction, steel pipe trusses, as an important structural component, are widely used in various building structures, especially in floor structures. Steel pipe truss structures have advantages such as light weight, high strength, and high stiffness, effectively improving the overall performance of building structures.

[0003] Currently, common steel pipe trusses on the market mainly consist of an upper chord steel pipe, a lower chord steel pipe, and web members connecting the two. For example, Chinese patent document CN106760218A discloses a steel pipe truss that includes an upper chord steel pipe, a lower chord steel pipe, and wavy web members. Multiple bends at the upper end of the web members connect to the upper chord steel pipe, and multiple bends at the lower end of the web members connect to the lower chord steel pipe. The upper and lower chord steel pipes are parallel to each other. This structure is rationally designed and can be used to manufacture lightweight beams, columns, and precast composite slabs, possessing high rigidity and shear resistance.

[0004] Furthermore, Chinese patent document CN113089920B describes a prestressed concrete composite slab with steel pipe truss structure, in which the troughs of the corrugated steel bars and / or the lower sections of the web members are laterally bent to form a bent V-shaped support and force transmission component. This design ensures structural strength while facilitating industrialization, standardization, and mechanized production.

[0005] However, existing steel pipe truss structures still have some technical problems. First, traditional steel pipe trusses usually adopt a combination structure of upper and lower chord steel pipes and corrugated web members, which consumes a large amount of steel and results in material waste. Second, the existing connection methods between steel pipe trusses and precast floor slabs and their reinforcing bars are not reasonable enough, making it difficult to form an effective overall collaborative working mechanism.

[0006] In particular, the concrete composite slab supporting the steel pipe truss mentioned in the Chinese patent document with publication number CN115341703A, although the connection with the bottom plate is enhanced by forming a webbed structure by laterally bending the lower arc of the wavy steel bar, still has problems such as complex manufacturing and difficult installation, and cannot well adapt to the arrangement requirements of the pre-embedded steel bars.

[0007] Therefore, there is an urgent need to develop a steel pipe truss structure with a more optimized structure, higher material utilization rate, and more reasonable connection with the precast floor slab and its reinforcing bars, in order to solve the problems of material waste and insufficient structural stability in the existing technology. Summary of the Invention

[0008] To address the problems of excessive steel consumption and material waste caused by insufficient structural optimization in existing steel truss structures, and to achieve the goals of saving steel consumption, improving welding quality, and enhancing the stability of truss connections, this invention provides a steel pipe truss component.

[0009] The technical solution adopted by the present invention to solve its technical problem is as follows: a steel pipe truss component is provided, including a precast concrete base slab, an upper chord steel pipe, and a single continuous bent web member arranged along the length of the upper chord steel pipe; the web member is a hollow tube and the entire web member is sinusoidal wave-shaped; the upper surface of the top bend of the web member is welded to the upper chord steel pipe, and the bottom bend is embedded in the precast concrete base slab; the upper surface of the bottom bend of the web member is recessed downward to form a receiving groove, and the receiving groove is used to receive the pre-embedded reinforcing bars in the precast concrete base slab.

[0010] Preferably, the inner walls of the left and right sides of the receiving groove are interference-fitted with the pre-embedded steel bars in the precast concrete base plate.

[0011] Preferably, the bottom surface of the upper chord steel pipe is a plane, and the upper surface of the top bend of the web member is welded to the bottom surface of the upper chord steel pipe for surface contact.

[0012] Preferably, the cross-section of the upper chord steel pipe is rectangular.

[0013] Preferably, the interior of the upper chord steel pipe can be filled with high-strength grout, concrete, or mortar.

[0014] Furthermore, the present invention also provides a floor slab, a steel pipe truss, and longitudinal and transverse embedded steel bars arranged at intervals within a precast concrete base slab. The steel pipe truss includes an upper chord steel pipe and a single, continuously bent web member arranged along the length of the upper chord steel pipe. The web member is a hollow tube and the entire web member is sinusoidal wave-shaped. The upper surface of the top bend of the web member is welded to the middle area of ​​the bottom of the upper chord steel pipe, and the bottom bend is embedded in the precast concrete base slab. The upper surface of the bottom bend of the web member is recessed downward to form a receiving groove, which is used to receive the longitudinal embedded steel bars within the precast concrete base slab. The floor slab also includes beams, columns, or walls supporting the precast concrete base slab.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The present invention adopts a structure in which a single sinusoidal wave-shaped web member is welded to an upper chord steel pipe. Compared with the traditional structure in which web members are welded on both sides, this significantly reduces the amount of steel used and achieves material saving.

[0017] 2. By designing the top bend of the web member as a flat surface, surface contact welding is achieved with the bottom surface of the upper chord steel pipe, which greatly improves the welding strength and structural stability compared to point contact welding.

[0018] 3. The receiving groove formed by the downward indentation of the upper surface of the bottom bend of the web member cleverly utilizes the pre-embedded steel bars in the precast concrete base plate, allowing the pre-embedded steel bars to pass through the receiving groove, thereby stabilizing the truss on the precast base plate and creatively combining the truss with the pre-embedded steel bars in the precast base plate.

[0019] 4. The interference fit design between the receiving groove and the pre-embedded steel bars further enhances the connection stability between the truss and the precast base plate, and improves the safety and reliability of the overall structure.

[0020] 5. The design of filling the interior of the upper chord steel tube with concrete, high-strength grout, or mortar provides the truss with higher load-bearing capacity and rigidity, adapting to different engineering needs. Attached Figure Description

[0021] Figure 1 A 3D view of the steel pipe truss components;

[0022] Figure 2 This is a front view of a steel pipe truss component;

[0023] Figure 3 This is a schematic diagram of the floor slab. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please refer to Figure 1 , Figure 2 This embodiment provides a steel pipe truss component, including an upper chord steel pipe 1 and a single, continuously bent web member 2 arranged along the length of the upper chord steel pipe 1. The web member is a hollow tube and the entire web member is sinusoidal wave-shaped. The upper surface of the top bend of the web member is welded to the upper chord steel pipe, and the bottom bend is embedded in a precast concrete base slab. The upper surface of the bottom bend is recessed downward to form a receiving groove 10, which is used to receive the pre-embedded reinforcing bars 11 on the precast floor slab.

[0027] Specifically, the upper chord steel pipe is made of Q345B steel, and its length is determined according to the actual floor span, usually 3-6 meters. The upper chord steel pipe plays a major role in bearing pressure and bending moment in the entire truss structure, and its strength and stiffness directly affect the load-bearing capacity of the entire truss.

[0028] The web members are also made of hollow tubes of Q345B steel, with a diameter of 15mm and a wall thickness of 1mm. The web members are sinusoidal wave-shaped, with a wavelength of approximately 200mm and a wave height of approximately 150mm. This wave shape allows the web members to better distribute stress when bearing loads, improving the overall structural stability. The web members are formed by continuous bending, creating multiple top and bottom bends. The top bends are welded to the upper chord steel tube, while the bottom bends are embedded in the precast concrete base slab. In actual manufacturing, the web members are formed by bending a single steel tube using a machine.

[0029] The inner surface of the bottom bend of the web member is recessed inward to form a receiving groove, which is approximately 6 mm wide and 12 mm deep, to accommodate the embedded steel bars on the precast floor slab. The design of the receiving groove enables the steel pipe truss to form a stable connection with the steel mesh system on the precast floor slab, enhancing the overall structural synergy.

[0030] The inner walls of the receiving groove on both sides are interference-fitted with the pre-embedded steel bars, that is, the inner diameter of the receiving groove is slightly smaller than the outer diameter of the pre-embedded steel bars. When the pre-embedded steel bars pass through the receiving groove, a certain amount of compressive force is generated, forming a tight connection. This interference fit design makes the steel pipe truss and the pre-embedded steel bars form a more solid connection, effectively preventing relative slippage and lateral overturning under horizontal loads, and ensuring that the steel pipe truss remains vertical and does not shift when the bottom slab concrete is poured.

[0031] In this embodiment, the bottom surface of the upper chord steel pipe is flat, and the welding point between the upper surface of the top bend of the web member and the lower surface of the bottom of the upper chord steel pipe is in surface contact. Specifically, the welding point is the middle area of ​​the bottom of the upper chord steel pipe. This surface contact connection method increases the welding area, improves the welding strength, and makes the connection between the upper chord steel pipe and the web member more robust and reliable. The welding adopts a full penetration welding process, with a weld thickness of not less than 2mm, ensuring that the connection strength meets structural requirements.

[0032] In this embodiment, the upper chord steel pipe has a rectangular cross-section with a length of 90mm, a width of 50mm, and a wall thickness of 2mm. The rectangular cross-section satisfies the requirement that the bottom surface of the upper chord steel pipe is flat, and at the same time, the rectangular cross-section can increase the volume of concrete filling inside the steel pipe without reducing the distance between the bottom surface of the steel pipe and the precast base plate.

[0033] The upper chord steel pipe can be filled with concrete of strength grade C30-C50, forming a steel-concrete composite structure that further enhances the load-bearing capacity and rigidity of the upper chord steel pipe. When filling with concrete, grouting holes with a diameter of 20mm-30mm need to be pre-drilled at both ends of the upper chord steel pipe to facilitate concrete pouring and venting. Before concrete pouring, the inner wall of the upper chord steel pipe can be derusted to ensure good adhesion between the steel pipe and the concrete.

[0034] The web members of the steel pipe truss employ a single hollow steel pipe with continuous bending design. Compared to the traditional multi-web member design, this reduces the number of welding nodes, lowers manufacturing difficulty and cost, and improves the overall integrity and reliability of the structure. The sinusoidal wave-shaped web member design increases the structure's deformation capacity and improves its seismic performance.

[0035] Example 2

[0036] Please refer to Figures 1-3 This embodiment provides a floor slab, including a steel pipe truss 100 and longitudinally embedded reinforcing bars 11 and transversely embedded reinforcing bars 101 arranged at intervals. The web members of the steel pipe truss are placed between two rows of transversely embedded reinforcing bars. The steel pipe truss includes an upper chord steel pipe and a single web member arranged below the upper chord steel pipe along its length. The web member is a hollow tube and the entire web member is sinusoidally wavy. The upper surface of the top bend of the web member is welded to the upper chord steel pipe, and the bottom bend is embedded in the precast floor slab. The upper surface of the bottom bend is recessed inward to form a receiving groove through which the longitudinally embedded reinforcing bars can pass. The floor slab also includes beams, columns, or walls supporting the precast concrete floor slab.

[0037] The structure of the steel pipe truss 100 is the same as that in Embodiment 1. In other embodiments, the upper chord steel pipe of the steel pipe truss 100 may also be semi-circular, oval, or other shapes, as long as the bottom surface of the upper chord steel pipe is flat.

[0038] The construction process of the floor slab is as follows: First, formwork is laid, and longitudinal and transverse embedded steel bars are arranged at intervals on the formwork to form a steel mesh; then, the steel pipe truss is placed between two rows of transverse embedded steel bars, so that the receiving groove at the bottom bend of the web members is aligned with the longitudinal embedded steel bars, and the web members are pressed into the longitudinal embedded steel bars, so that the longitudinal embedded steel bars and the receiving grooves form an interference fit; alternatively, transverse embedded steel bars can be arranged on the formwork first, then the steel pipe truss is placed between two rows of transverse embedded steel bars, and finally longitudinal embedded steel bars are arranged, so that the longitudinal embedded steel bars are inserted into the receiving grooves; finally, concrete is poured, with a concrete strength grade of C40 and a pouring thickness of 70mm, so that the steel pipe truss and the precast base slab form an integral structure. In addition, in order to further stabilize the steel pipe truss and prevent the steel pipe truss in this embodiment from collapsing during placement or concrete pouring, support structures for stabilizing the steel pipe truss can be inserted at both ends of the steel pipe truss.

[0039] In the floor structure of this embodiment, the steel pipe truss and the reinforcing mesh on the precast base slab form a cohesive whole, greatly improving the load-bearing capacity and stiffness of the precast base slab. The upper chord of the steel pipe truss mainly bears compressive and bending moment, while the web members mainly transmit shear force. The precast base slab and the cast-in-place concrete layer jointly bear compressive and shear forces. This combined structure fully utilizes the material properties of each component, achieving lightweight and high efficiency.

[0040] Compared to traditional floor slabs, the floor slab in this embodiment has advantages such as lighter weight, larger span, and faster construction speed. Because it uses steel pipe trusses as the main load-bearing components, the floor slab's weight is reduced by approximately 30% compared to traditional concrete floor slabs, while the span can be more than 1.5 times that of traditional floor slabs. Furthermore, the use of precast base slabs and steel pipe trusses significantly reduces on-site construction work, improves construction efficiency, and shortens the construction period.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel pipe truss component, characterized in that: It includes a precast concrete base slab, an upper chord steel pipe, and a single continuously bent web member arranged along the length of the upper chord steel pipe; the web member is a hollow tube and the entire web member is sinusoidal wave-shaped, the upper surface of the top bend of the web member is welded to the middle area of ​​the bottom of the upper chord steel pipe, and the bottom bend is embedded in the precast concrete base slab; the upper surface of the bottom bend of the web member is recessed downward to form a receiving groove, which is used to receive the pre-embedded steel bars in the precast concrete base slab.

2. A steel pipe truss member according to claim 1, characterized in that: The inner walls of the left and right sides of the receiving groove are interference-fitted with the pre-embedded steel bars in the precast concrete base slab.

3. A steel pipe truss member according to claim 1, characterized in that: The bottom surface of the upper chord steel pipe is a plane, and the upper surface of the top bend of the web member is welded to the bottom surface of the upper chord steel pipe to form a surface contact.

4. A steel pipe truss member according to claim 1, characterized in that: The upper chord steel pipe has a rectangular cross-section.

5. A floor slab, comprising longitudinal and transverse embedded steel bars arranged at intervals within a steel pipe truss and a precast concrete base slab, characterized in that: The steel pipe truss includes an upper chord steel pipe and a single, continuously bent web member arranged along the length of the upper chord steel pipe. The web member is a hollow tube and the entire web member is sinusoidal wave-shaped. The upper surface of the top bend of the web member is welded to the middle area of ​​the bottom of the upper chord steel pipe, and the bottom bend is embedded in the precast concrete base slab. The upper surface of the bottom bend of the web member is recessed downward to form a receiving groove, which is used to receive the longitudinal embedded steel bars in the precast concrete base slab.

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