Full-bolt-connection crossed H-shaped steel reinforced square steel tube concrete structure and construction method

Abstract

The invention belongs to the technical field of concrete filled steel tubes, and discloses a full-bolt-connection crossed H-shaped steel reinforced square steel tube concrete structure and a construction method.The structure comprises a square steel tube, crossed H-shaped steel used for reinforcement is arranged in the square steel tube, and the space between the crossed H-shaped steel and an inner cavity of the square steel tube is filled with concrete; the crossed H-shaped steel comprises a plurality of first steel plates which are attached to the inner wall of the square steel pipe, the adjacent first steel plates are fixedly connected with one ends of second steel plates and third steel plates respectively, the other ends of the second steel plates are fixedly connected with the opposite first steel plates, and the ends, away from the first steel plates, of the third steel plates are fixedly connected with the second steel plates. A fastening assembly is arranged on the square steel pipe, and the first steel plate is connected to the inner wall of the square steel pipe in a bolted mode through the fastening assembly. According to the method, the local buckling resisting capacity of the square steel tube flat plate is improved, the restraining effect of the steel tube wall on the core concrete is improved, and the strength of the square steel tube concrete under the action of axial pressure and bending moment and the ductility and energy dissipation capacity under the action of earthquake loads can be remarkably enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel tube concrete, and in particular relates to a fully bolted cross H-shaped steel reinforced square steel tube concrete structure and a construction method. Background Art

[0002] Steel tube concrete has the advantages of high bearing capacity, good plasticity and toughness, convenient construction and excellent economic benefits, so it has been widely used in modern building structures.

[0003] In order to suppress the local buckling of the square steel tube flat plate and enhance the restraining effect of the square steel tube on the core concrete, relevant scholars at home and abroad have tried a variety of methods to reinforce the square steel tube concrete, such as setting a restraining rod on the outside of the square steel tube, welding tie steel bars on the inner wall of the square steel tube, welding longitudinal stiffening ribs on the inner wall of the square steel tube, welding oblique stiffening ribs near the internal chamfer of the square steel tube, welding shear studs on the inner wall of the square steel tube, and using FRP or TRC to reinforce the outer periphery of the square steel tube; however, these common types of square steel tube concrete have problems such as difficult construction, high construction cost, and insufficient reinforcement effect, which are not convenient for promotion and application.

[0004] Therefore, the present invention designs a fully bolted cross H-shaped steel reinforced square steel tube concrete structure and a construction method to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a fully bolted cross H-steel reinforced square steel tube concrete structure and construction method, which effectively suppresses the local buckling of the square steel tube flat plate and enhances the restraining effect of the square steel tube on the core concrete.

[0006] To achieve the above object, the present invention provides a fully bolted cross H-shaped steel reinforced square steel tube concrete structure, comprising a square steel tube, wherein a cross H-shaped steel for reinforcement is arranged inside the square steel tube, and concrete is filled between the cross H-shaped steel and the inner cavity of the square steel tube;

[0007] The cross H-shaped steel comprises a plurality of first steel plates, the first steel plates are attached to the inner wall of the square steel tube, one end of a second steel plate and a third steel plate are respectively fixedly connected to adjacent first steel plates, the other end of the second steel plate is fixedly connected to the opposite first steel plate, and one end of the third steel plate away from the first steel plate is fixedly connected to the second steel plate;

[0008] The square steel tube is provided with a fastening assembly, and the fastening assembly bolts the first steel plate to the inner wall of the square steel tube.

[0009] Preferably, the fastening assembly includes a first flange cap and a second flange cap that are correspondingly arranged, the first flange cap is arranged inside the square steel tube and abuts against the first steel plate, the second flange cap is arranged outside the square steel tube and abuts against the square steel tube, and a fixing screw is arranged between the first flange cap and the second flange cap.

[0010] Preferably, the first flange cap is welded to the first steel plate.

[0011] Preferably, a plurality of first connection holes are formed through the first steel plate, the first flange cap is arranged corresponding to the first connection holes, and the fixing screw is threadedly connected to the first flange cap after passing through the first connection hole.

[0012] Preferably, a plurality of second connection holes corresponding to the first connection holes are formed through the side wall of the square steel tube, the second connection holes are corresponding to the second flange cap, and the fixing screw extends out of the second connection hole and is threadedly connected to the second flange cap.

[0013] Preferably, the second steel plate and the third steel plate divide the inner cavity of the square steel tube into a plurality of chambers, and the concrete is filled in the chambers.

[0014] The present invention also discloses a construction method for a fully bolted cross H-shaped steel reinforced square steel tube concrete structure, comprising the following steps:

[0015] Cutting the square steel tube, the first steel plate, the second steel plate and the third steel plate in sequence;

[0016] The first steel plate, the second steel plate and the third steel plate are welded together to form a cross H-shaped steel;

[0017] Insert the cross H-shaped steel into the square steel tube for positioning and alignment;

[0018] The cross H-shaped steel and the square steel pipe are bolted together by fastening components;

[0019] Pour concrete between the inner cavity of the square steel tube and the cross H-shaped steel;

[0020] Curing concrete to achieve the designed strength of concrete

[0021] Preferably, in the step of cutting the first steel plate and the square steel tube, a second connecting hole is opened on the outer wall of the square steel tube, and a first connecting hole is opened on the first steel plate.

[0022] Preferably, the first flange cap is welded to a position of the first steel plate corresponding to the first connecting hole between the combined cross H-shaped steels.

[0023] Preferably, when the fastening assembly is assembled with the cross H-shaped steel, the first connecting hole is aligned with the second connecting hole, and then the fixing screw is inserted so that the fixing screw is threadedly connected to the first flange cap, and then the second flange cap is threadedly connected to the fixing screw so that the second flange cap abuts against the outer wall of the square steel tube.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a fully bolted fully bolted cross H-shaped steel reinforced square steel tube concrete structure and a construction method, which is a novel steel tube concrete composite structure in which cross H-shaped steel is arranged inside the square steel tube, and then the steel tube wall and the cross H component are anchored by a fastening assembly outside the square steel tube. Concrete is filled inside the steel tube, and is mainly used in steel tube concrete beams, columns and other load-bearing components in industrial and civil buildings, and is used for the compression of column components, energy dissipation under seismic loads, and bending of beam components; compared with the existing steel tube concrete, the present invention has the following advantages:

[0025] In terms of mechanical properties: the cross H-shaped steel thickens the flat plate area of ​​the square steel tube, improving the ability of this area to resist local buckling; the cross H-shaped steel located inside the square steel tube forms a mutual restraint effect through the anchoring of the fastening components, further improving the ability of the square steel tube to resist local buckling; the cross H-shaped steel can divide the interior of the square steel tube into several independent parts, enhancing the restraint effect of the square steel tube on the concrete in the core area, thereby improving the utilization efficiency of concrete materials; the part of the fastening component located inside the square steel tube can enhance the bonding and sliding force between the steel tube and the concrete, reducing the impact of the debonding of the steel tube and the concrete; there is no need to carry out welding operations inside the steel tube or on the inner wall of the steel tube, avoiding the influence of welding residual stress on the mechanical properties of the steel tube.

[0026] In terms of construction operation: when installing the cross H-shaped steel, it is only necessary to simply bolt the fastening components on the steel pipe wall, which simplifies the construction process; after installing the cross H-shaped steel, the tightening operation of the fastening components is located outside the steel pipe, which is conducive to construction operation; the bolts exposed on the outside of the steel pipe provide convenient construction conditions for the subsequent arrangement of the steel cage, which is conducive to the construction of a steel tube concrete hybrid structure with stronger fire resistance; the fastening components located on the outside of the steel pipe provide convenient operating conditions for the connection of the beam-column nodes, which is conducive to the assembly construction of the nodes.

[0027] The present invention not only improves the ability of the square steel tube flat plate to resist local buckling, but also improves the restraining effect of the steel tube wall on the core concrete, and can significantly enhance the strength of the square steel tube concrete under axial compression and bending moment, as well as the ductility and energy dissipation capacity under seismic load. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 This is an axial view of the fully bolted cross H-steel reinforced square steel tube concrete structure of the present invention;

[0030] Figure 2 A top view of a fully bolted cross H-shaped steel reinforced square steel tube concrete structure according to the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the fastening assembly of the present invention;

[0032] Figure 4 For the present invention Figure 3 A partial enlarged view of middle A;

[0033] Figure 5 It is the force diagram of the circular tube of the circular steel tube concrete in the prior art of the present invention;

[0034] Figure 6 It is the concrete stress diagram of the circular steel tube concrete in the prior art of the present invention;

[0035] Figure 7 The square tube force diagram of the square steel tube concrete in the prior art of the present invention;

[0036] Figure 8 It is the concrete stress diagram of square steel tube concrete in the prior art of the present invention;

[0037] Fig. 9 This is the square steel tube concrete restraint tie rod reinforcement method in the prior art of the present invention;

[0038] Fig.10 This is a square steel tube concrete tie steel bar reinforcement method in the prior art of the present invention;

[0039] Fig.11 This is the square steel tube concrete longitudinal stiffening rib reinforcement method in the prior art of the present invention;

[0040] Fig.12 This is the square steel tube concrete oblique stiffening rib reinforcement method in the prior art of the present invention;

[0041] Fig.13 This is a square steel tube concrete shear stud reinforcement method in the prior art of the present invention;

[0042] Fig.14 It is a square steel tube concrete FRP or TRC reinforcement method in the prior art of the present invention;

[0043] In the figure: 1. square steel pipe; 2. first steel plate; 3. second steel plate; 4. third steel plate; 5. fixing screw; 6. first flange cap; 7. second flange cap; 8. concrete; 9. first connecting hole; 10. second connecting hole. DETAILED DESCRIPTION

[0044] The steel tube concrete mentioned in the present invention is a building material in which concrete is filled into a steel tube and compacted to form a structural member. The following is a detailed introduction to steel tube concrete:

[0045] 1. Definition and Characteristics

[0046] Definition: Steel tube concrete refers to a structural member formed by filling concrete in a steel tube, and the steel tube and its core concrete can jointly withstand external loads.

[0047] Features:

[0048] High strength: The steel pipe's hoop effect on the concrete puts the concrete in a three-way compressive state, thereby improving its compressive strength.

[0049] Good ductility: Steel tube concrete components show good plastic deformation capacity during stress, which is beneficial to the seismic performance of the structure.

[0050] Easy construction: Steel pipes can be used as a rigid skeleton to bear the construction load and structural weight during the construction phase. The construction is not affected by the concrete curing time and does not require formwork, saving the materials and labor costs of supporting and removing formwork.

[0051] Good economy: Compared with reinforced concrete columns, the cross-sectional area of ​​CFST columns can be greatly reduced, thereby increasing the usable space and area of ​​the building and reducing the project cost.

[0052] 2. Classification and strength level

[0053] Classification: According to different cross-sectional shapes, steel tube concrete can be divided into circular steel tube concrete, square (rectangular) steel tube concrete and polygonal steel tube concrete.

[0054] Strength grade: According to the strength grade of concrete, steel tube concrete can be divided into ordinary steel tube concrete (concrete strength grade below C50), high-strength steel tube concrete (concrete strength grade above C50) and ultra-high-strength steel tube concrete (concrete strength grade above C100).

[0055] 3. Application fields

[0056] Single-story and multi-story industrial plant columns: Steel tube concrete structure gives full play to the high compressive properties of both concrete and steel tube, has good ductility and good corrosion resistance, so it is often preferred in industrial plants with large spans, large column spacing and industrial plants in harsh environments.

[0057] High-rise buildings: Concrete-filled steel tubes have high bearing capacity, good plasticity and toughness, and better corrosion resistance and fire resistance than traditional steel columns. Its construction process is simple and can save a lot of labor and materials. Many high-rise and super-high-rise buildings built at home and abroad have adopted concrete-filled steel tube structures.

[0058] Large-span bridge projects: The bearing capacity per unit weight of steel tube concrete is close to or even higher than that of steel, and its steel tubes can be used as rigid skeletons in the installation and erection stages, formwork and reinforcement in the concrete pouring stage, etc., which comprehensively solves many contradictions required by bridge structures, such as saving materials, light installation weight, simple construction, and large bearing capacity.

[0059] 4. Advantages and Benefits

[0060] Improve bearing capacity: Steel tube concrete has high compressive and shear bearing capacity, which is more than twice the sum of steel tube and concrete.

[0061] Save materials: Compared with reinforced concrete columns, the cross-sectional area of ​​CFST columns is greatly reduced, which reduces material consumption.

[0062] Reduced self-weight: The cross-section of the column is reduced, and the self-weight is reduced, which is beneficial to the earthquake resistance of the structure and the reduction of the cost of the foundation.

[0063] Quick construction: The thin wall of steel pipes facilitates material selection, manufacturing and on-site welding, making it one of the fastest-constructing building structures.

[0064] Significant economic benefits: High-rise buildings using steel tube concrete structures have very significant economic benefits, such as Shenzhen SEG Plaza Building.

[0065] In summary, as a new type of building composite structural material, steel tube concrete has broad application prospects and significant economic benefits in engineering fields such as construction and bridges.

[0066] Among the existing technical solutions, the cross-sectional forms of CFST, which are most widely used in engineering practice, are mainly of two types: circular and square. Compared with circular CFST, square CFST has the advantages of excellent bending mechanical properties and beautiful appearance. At the same time, square CFST is simpler in the structural connection of beam-column nodes, making square CFST a more common cross-sectional form in building structures. However, compared with the more uniform constraint effect provided by circular steel pipes on core concrete, the constraint effect of square steel pipes on core concrete generally only exists near the four chamfers of the steel pipe, that is, the flat plate of the square steel pipe provides almost no constraint effect on the core concrete. This results in the overall constraint effect of square steel pipes on core concrete under the same conditions being significantly weaker than that of circular steel pipes. The specific interaction relationship between circular and square steel pipes and core concrete is as follows: Figure 5-8 As shown. Therefore, under the same conditions, the compressive and seismic mechanical properties (such as bearing capacity, ductility, etc.) of square CFST are also significantly weaker than those of circular CFST. Therefore, in order to suppress the local buckling of the square steel tube flat plate and enhance the restraining effect of the square steel tube on the core concrete, relevant scholars at home and abroad have tried various methods to reinforce the square steel tube concrete.

[0067] In the existing technology, FRP (fiber reinforced composite material) is a new type of material that is made by mixing high-performance fibers such as carbon fiber, glass fiber, aramid fiber, basalt fiber and a resin matrix and compounding through a certain processing technology. It has the characteristics of high strength, high durability, and strong designability.

[0068] FRP reinforced concrete structures have the advantages of light weight, high strength, corrosion resistance, small thermal expansion coefficient, good fatigue resistance, efficient and convenient construction, etc., so they can also be considered for the reinforcement of steel tube concrete.

[0069] When reinforcing concrete-filled steel tubes with FRP, a variety of methods can be used, including but not limited to:

[0070] External reinforcement method: reinforce the steel tube concrete by pasting FRP sheets (such as carbon fiber cloth, glass fiber cloth, etc.). This method is easy to construct and has strong adaptability to the shape and size of steel tube concrete, but it is necessary to ensure that the bonding strength between the FRP sheet and the steel tube concrete is sufficient.

[0071] Embedded reinforcement method: grooves are made on the surface of steel tube concrete, FRP bars or strip-type FRP plates are filled in, and adhesives are used to make them tightly bonded. This method can increase the bonding surface area between FRP and steel tube concrete and improve the reinforcement efficiency, but the size and direction of the grooves need to be strictly controlled to avoid causing excessive damage to the original structure.

[0072] Prestressed reinforcement method: Use prestressed FRP materials (such as prestressed carbon fiber cloth, prestressed fiberboard, etc.) for reinforcement. This method can give full play to the high strength advantages of FRP materials and improve the bearing capacity and deformation capacity of steel tube concrete. However, the construction of prestressed reinforcement technology is relatively complex and requires professional equipment and skills.

[0073] When choosing an FRP reinforcement method, the following factors need to be considered:

[0074] Reinforcement purpose: It is clear whether the purpose of reinforcement is to increase the load-bearing capacity, improve the mechanical performance or enhance the durability. Different reinforcement purposes may require different reinforcement methods and materials.

[0075] Structural characteristics: Consider the cross-sectional form, size, material properties and other factors of CFST. For example, there are differences in the mechanical properties and construction difficulty between circular CFST and square CFST, so it is necessary to select a suitable reinforcement method.

[0076] Construction conditions: Consider factors such as construction site, construction equipment, and construction personnel skills. Different reinforcement methods have different requirements for construction conditions, and it is necessary to select a reinforcement scheme that is suitable for the current construction conditions.

[0077] In addition, in the process of FRP reinforcement of steel tube concrete, the following points should be noted:

[0078] Surface treatment: Clean and treat the surface of the steel tube concrete to ensure that the FRP material can bond closely to it.

[0079] Material selection: Select FRP materials and adhesives of reliable quality to ensure the reinforcement effect.

[0080] Construction quality control: Strictly control each link in the construction process, such as slotting size, adhesive application, FRP material pasting, etc., to ensure the quality of reinforcement.

[0081] In general, FRP reinforced concrete-filled steel tubes is an effective reinforcement method that can improve the bearing capacity and durability of the structure. When selecting reinforcement methods and materials, factors such as the purpose of reinforcement, structural characteristics, and construction conditions need to be considered, and each link in the construction process must be strictly controlled to ensure the quality of reinforcement.

[0082] In the existing technology, TRC (Textile Reinforced Concrete) reinforced steel tube concrete is an innovative engineering practice, which combines the excellent performance of TRC materials with the structural advantages of steel tube concrete. The following is a detailed analysis of TRC reinforced steel tube concrete:

[0083] TRC Material Overview

[0084] TRC is a new type of cement-based composite material, mainly composed of multi-axial mixed fiber fabric mesh and high-performance concrete. Among them, the fiber fabric mesh usually uses a mixed fabric of carbon fiber and alkali-resistant glass fiber to enhance the mechanical properties of concrete. High-performance concrete uses high-performance fine aggregate concrete, which has high strength and good durability. TRC material has the advantages of light weight, high strength, corrosion resistance, and fire resistance. It is particularly suitable for thin-walled structures in harsh environments and reinforcement of existing structures.

[0085] Overview of Concrete-Filled Steel Tube

[0086] CFST is a composite structural material formed by filling concrete into a steel tube. It combines the tensile and compressive properties of the steel tube with the compressive properties of concrete, and has high strength and durability. CFST also has the advantages of convenient construction and good earthquake resistance, and has been widely used in the fields of construction and engineering. However, CFST also has some disadvantages, such as high cost, difficult maintenance, and greater impact on the environment.

[0087] Advantages of TRC reinforced concrete-filled steel tubes

[0088] Improve bearing capacity: The high strength characteristics of TRC materials can significantly improve the bearing capacity of steel tube concrete, enabling it to withstand greater loads.

[0089] Enhanced durability: The corrosion resistance and fire resistance of TRC materials can extend the service life of concrete-filled steel tubes and reduce maintenance costs.

[0090] Improved seismic performance: The addition of TRC materials can enhance the seismic performance of CFST, making it safer and more reliable in natural disasters such as earthquakes.

[0091] Easy construction: TRC reinforced steel tube concrete can be prefabricated and installed on site, reducing on-site construction time and period and improving construction efficiency.

[0092] Application of TRC reinforced concrete-filled steel tube

[0093] TRC reinforced steel tube concrete can be used in various structures that need to improve bearing capacity and durability, such as bridges, high-rise buildings, towers, etc. Especially in harsh environments, such as seaside, chemical plants and other places with strong corrosiveness, the advantages of TRC reinforced steel tube concrete are more obvious.

[0094] Precautions

[0095] Material selection: When selecting TRC materials and steel tube concrete, they should be selected according to specific project needs and environmental conditions to ensure that the material performance meets the requirements.

[0096] Construction technology: The construction technology of TRC reinforced steel tube concrete should be carried out strictly in accordance with relevant specifications to ensure construction quality and safety.

[0097] Inspection and maintenance: During use, TRC reinforced steel tube concrete should be inspected and maintained regularly to detect and deal with potential problems in a timely manner.

[0098] In summary, TRC reinforced steel tube concrete is an innovative technology with broad application prospects and potential. It combines the advantages of TRC materials and steel tube concrete, can significantly improve the bearing capacity and durability of the structure, improve seismic performance, and reduce maintenance costs. In future engineering practice, TRC reinforced steel tube concrete will be more widely used and developed.

[0099] See attached Fig. 9 -Attached Fig.14 The following are some common square steel tube concrete reinforcement methods, but these reinforcement methods have the following problems:

[0100] 1. For square steel tube concrete with restraining rods, the restraining rods can only limit the local buckling of the steel tube wall near the anchor bolts. However, for the steel tube area between the two parallel rods, the steel tube may still undergo local buckling under the action of compressive load. At this time, the compressive strength of the component will be determined by the weakest area of ​​its cross section.

[0101] 2. For square steel tube concrete with longitudinal stiffening ribs welded on the inner wall of the steel tube, when the size of the square steel tube is small, the welding of the longitudinal stiffening ribs will inevitably cause welding construction difficulties, and the longitudinal stiffening ribs located on the inner wall of the steel tube have limited reinforcing effect on the restraint of the core concrete. In addition, welding the longitudinal stiffening ribs on the inner wall of the steel tube will also cause welding residual stress, thereby affecting the ductility and energy dissipation capacity of the component under seismic loads.

[0102] 3. For square steel tube concrete with tie bars welded on the inner wall of the steel tube and oblique stiffening ribs welded near the internal chamfer of the steel tube, there are also problems of welding construction difficulties and residual stress. In addition, welding oblique stiffening ribs near the internal chamfer of the square steel tube will also affect the pouring quality of concrete.

[0103] 4. For square steel tube concrete with shear studs welded on the inner wall of the steel tube, the shear studs have a significant effect on enhancing the bond-slip effect between the steel tube and concrete, but have limited effect on the axial compressive bearing capacity of the square steel tube concrete.

[0104] 5. For square steel tube concrete reinforced with FRP, the restraining effect of FRP generally only exists in the four chamfered areas of the square steel tube and is greatly affected by the chamfer radius. In addition, the FRP-reinforced components show obvious brittle failure characteristics.

[0105] 6. For square steel tube concrete reinforced with TRC, specific cement-based materials (ensuring strong viscosity and low fluidity) need to be used during construction, or specific templates are used to ensure that the cement-based materials and fiber grids are effectively adhered to the outer surface of the steel tube, which will increase the difficulty and cost of construction.

[0106] Among the existing published patents, patent number CN202011069379.3 discloses an H-shaped steel-concrete composite beam, comprising an upper steel plate and a lower steel plate, wherein the upper steel plate and the lower steel plate are symmetrically arranged, and an arc-shaped convex surface is arranged on the opposite side of the upper steel plate and the lower steel plate along the width direction thereof, and a shear reinforcement unit is uniformly welded between the upper steel plate and the lower steel plate along the length direction thereof, and the shear reinforcement unit comprises two symmetrically arranged shear reinforcement monomers, wherein the shear reinforcement monomer comprises a lower arc-shaped steel bar arranged obliquely across the lower arc surface and an upper arc-shaped steel bar arranged obliquely across the upper arc surface, and the two are arranged crosswise, and the same-side ends of the upper arc-shaped steel bar and the lower arc-shaped steel bar are each fixedly connected by an inclined tension steel bar A rhombus monomer is horizontally arranged at the middle position corresponding to two of the inclined steel bars, and the rhombus monomer is formed by four straight steel bars hinged to each other, and two opposite hinge points of the rhombus monomer are respectively connected to two inclined steel bars, and the other two opposite hinge points of the rhombus monomer are respectively hinged with a male hinge block and a female hinge block, and the adjacent male hinge blocks and female hinge blocks are connected by bolts, concrete is arranged between the upper steel plate and the lower steel plate, and the ends of the adjacent inclined steel bars are in contact with each other, a protrusion is arranged at one end of the male hinge block, and a groove is arranged at one end of the female hinge block, the groove and the protrusion match each other, and bolt holes are penetrated by the groove and the protrusion in the longitudinal direction.

[0107] Working principle: The present invention adopts shear reinforcement unit to replace the middle web of concrete steel beam. The upper steel plate, lower steel plate and shear reinforcement unit are combined to bear the bending moment and compression of the beam. The combination of shear reinforcement unit and concrete can improve the shear force of the beam, give full play to the advantages of steel ductility and concrete durability, greatly reduce the amount of steel used, and because the web in the middle of the steel beam is eliminated, the amount of anti-corrosion paint and fire retardant coating at the flange of the steel beam is reduced, and the amount of anti-corrosion paint and fire retardant coating at the web of the steel beam is eliminated. In application, since the shear reinforcement monomer includes a lower arc-shaped steel bar arranged obliquely close to the lower arc surface and an upper arc-shaped steel bar arranged obliquely close to the upper arc surface, and the two are arranged crosswise, the ends of the upper arc-shaped steel bar and the lower arc-shaped steel bar on the same side are each fixedly connected by an inclined steel bar, such an arrangement increases the bearing area of ​​the shear reinforcement monomer in the space between the upper steel plate and the lower steel plate, improves its compression and bending moment resistance, and since the ends of the adjacent inclined steel bars are in contact, when the beam is compressed, the ends of the adjacent inclined steel bars can contact each other. The force is decomposed into the radial direction of the entire beam, which further improves the compression and bending moment resistance of the beam. At the same time, since the lower arc steel bar is close to the lower arc surface of the oblique span, and the upper arc steel bar is close to the upper arc surface of the oblique span, when compressed, the two ends of the oblique steel bar have a tendency to move to both sides, and the tendency of the two ends of the oblique steel bar to move to both sides will stretch the lower arc steel bar and the upper arc steel bar to move towards each other, that is, the pressure is decomposed to the lower arc steel bar and the upper arc steel bar, and the lower arc steel bar and the upper arc steel bar are welded on the lower arc surface and the upper arc surface due to the oblique span, that is The force can be decomposed into the width direction of the upper steel plate and the lower steel plate, which greatly improves the bearing capacity of the beam. When a certain part of the beam is compressed and causes the diagonal steel bars to deform, the two diagonal steel bars will push or pull the diamond monomers to deform, that is, the corresponding male hinge blocks and female hinge blocks will move relative to or toward each other. Since the adjacent male hinge blocks and female hinge blocks are connected by bolts, the adjacent diamond monomers can be driven to deform. In this way, the force is decomposed into the shear reinforcement units set in the entire length direction, which greatly improves the bearing capacity of the beam.

[0108] At the same time, in the existing published patents, the patent with patent number CN202110825838.4 discloses a steel tube concrete composite column, including an outer steel tube, a connecting steel plate fixedly connected to the inner side of the outer steel tube, the connecting steel plate is designed in a T structure, and there are twelve connecting steel plates distributed in a circular array about the center of the outer steel tube, which improves the connection strength between the steel tube and the concrete, and a concrete structure is arranged on the side of the connecting steel plate inside the outer steel tube, and a steel bar structure is arranged inside the concrete structure, and the steel bar structure includes reinforcing steel bars, stirrups, and tension bars. Stirrups are arranged on the outside of the reinforcing steel bars, and tension bars are arranged on the side of the stirrups to increase the bearing capacity of the concrete. The stirrups are designed in a rectangular structure, and there are four groups of reinforcing steel bars distributed in the central circular array of the stirrups, and each group of reinforcing steel bars is evenly spaced. The reinforcing steel bars and stirrups are adapted to each other, and two tension bars are arranged. Both ends of the two tension bars are designed in a hook-shaped structure, and the two ends of the tension bars are connected by snapping with the reinforcing steel bars, which improves the stability of the steel bar structure and ensures the bearing capacity of the steel tube concrete composite column.

[0109] An installation steel pipe is arranged inside the concrete structure on the inner side of the steel bar structure. There are four installation steel pipes, which are distributed in a field shape. The installation steel pipe is designed as a rectangular hollow structure to increase the energy consumption capacity of the steel tube concrete composite column and improve its seismic resistance. Energy-consuming particles are arranged inside the installation steel pipe, and a protective coating is arranged on the outer side of the outer steel pipe. The protective coating is a PP coating with a thickness of 1mm, which provides protection for the surface of the steel pipe to avoid corrosion damage of the steel pipe. The strength of the composite column and the connection strength of the steel pipe and concrete are effectively improved by connecting the steel plate and the steel bar structure. At the same time, it has good seismic resistance and anti-corrosion performance, which ensures the service life of the steel tube concrete composite column.

[0110] When in use, the steel bar structure is fixed, and the outer steel pipe is sleeved on the outside of the steel bar structure, and then concrete is poured in the outer steel pipe. A connecting steel plate is provided on the inner side of the outer steel pipe, and the connecting steel plate is in a T-shaped structure, so that one end of the connecting steel plate enters the concrete. After the concrete solidifies, the connecting steel plate ensures the stable connection between the outer steel pipe and the concrete structure, and the connecting steel plate provides good support for the outer steel pipe, effectively avoiding the deformation of the outer steel pipe. At the same time, when constructing the steel bar structure, the reinforcing steel bars and stirrups are combined into a steel cage to improve the bearing capacity of the concrete. By setting the tie bars, the two ends of the tie bars are bent into hooks during construction, and the The two ends are engaged with the reinforcing steel bars on both sides, thereby improving the stability of the steel bar structure, making the bearing pressure evenly distributed, greatly improving the bearing performance of the composite concrete composite column, and increasing the seismic performance of the steel tube concrete composite column by using energy-absorbing particles. The four installed steel pipes are used to evenly distribute the particles in the steel tube concrete composite column and fill them with energy-absorbing particles, thereby improving the energy absorption capacity of the steel tube concrete composite column, thereby improving the seismic performance of the steel tube concrete composite column when subjected to impact force, and increasing the corrosion performance of the steel tube concrete composite column by providing a protective coating on the outer steel pipe to avoid damage to the steel pipe, thereby delaying the service life of the steel tube concrete composite column.

[0111] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0112] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0113] Reference Figure 1-4 As shown, this embodiment provides a fully bolted cross H-shaped steel reinforced square steel tube concrete structure, comprising a square steel tube 1, a cross H-shaped steel for reinforcement is arranged inside the square steel tube 1, and concrete 8 is filled between the cross H-shaped steel and the inner cavity of the square steel tube 1;

[0114] The cross H-shaped steel includes a plurality of first steel plates 2, the first steel plates 2 are attached to the inner wall of the square steel tube 1, one end of the second steel plate 3 and the third steel plate 4 are fixedly connected to the adjacent first steel plates 2, the other end of the second steel plate 3 is fixedly connected to the opposite first steel plate 2, and the end of the third steel plate 4 away from the first steel plate 2 is fixedly connected to the second steel plate 3;

[0115] A fastening assembly is provided on the square steel tube 1 , and the fastening assembly fixes the first steel plate 2 to the inner wall of the square steel tube 1 .

[0116] The present invention discloses a fully bolted cross H-shaped steel reinforced square steel tube concrete structure and a construction method, which is a novel steel tube concrete 8 combined structure in which cross H-shaped steel is arranged inside a square steel tube 1, and then a fastening assembly is used outside the square steel tube 1 to anchor the steel tube wall and the cross H assembly. Concrete 8 is filled inside the steel tube. The structure is mainly used in steel tube concrete 8 beams, columns and other load-bearing components in industrial and civil buildings, and is used for compressive effects on column components, energy dissipation under seismic loads, and bending effects on beam components.

[0117] In one embodiment of the present application, the grade of concrete 8 needs to be adjusted according to demand. Concrete 8 of different grades has different properties, and technicians in this field can choose according to demand.

[0118] A further optimized solution is provided, in which the fastening assembly includes a first flange cap 6 and a second flange cap 7 which are correspondingly arranged. The first flange cap 6 is arranged inside the square steel tube 1 and abuts against the first steel plate 2. The second flange cap 7 is arranged outside the square steel tube 1 and abuts against the square steel tube 1. A fixing screw 5 is arranged between the first flange cap 6 and the second flange cap 7. The first flange cap 6 is welded to the first steel plate 2. The fastening assembly consists of a first flange cap 6, a second flange cap 7 and a fixing screw 5, the first flange cap 6 and the second flange cap 7 are correspondingly arranged, and the fixing screw 5 can be threadedly connected with the first flange cap 6 and the second flange cap 7 respectively; the first flange cap 6 is welded and fixed on the first steel plate 2, and the second flange cap 7 abuts against the outer wall of the square steel tube 1; when in use, the cross H-shaped steel composed of the first steel plate 2, the second steel plate 3 and the third steel plate 4 is first placed in the square steel tube 1, and then extended into the square steel tube 1 from the side wall of the square steel tube 1, and threadedly connected to the first flange cap 6, and then the second flange cap 7 is threadedly connected to the fixing screw 5, and tightened by a tool so that the second flange cap 7 abuts against the outer wall of the square steel tube 1, and the square steel tube 1 and the cross H-shaped steel are bolted together.

[0119] In one embodiment of the present application, the flange cap is also called a flange nut, which refers to a nut with a wide flange at one end, also known as a washer nut, a toothed nut, a hexagonal flange face nut, etc., and is mostly used in pipeline connections or workpieces that require an increased nut contact surface.

[0120] Further optimization scheme, a plurality of first connection holes 9 are formed through the first steel plate 2, the first flange cap 6 is arranged corresponding to the first connection holes 9, and the fixing screw 5 is threadedly connected with the first flange cap 6 after passing through the first connection hole 9; a plurality of second connection holes 10 corresponding to the first connection holes 9 are formed through the side wall of the square steel tube 1, the second connection holes 10 are arranged corresponding to the second flange cap 7, and the fixing screw 5 extends out of the second connection hole 10 and is threadedly connected with the second flange cap 7. The first connection hole 9 and the second connection are respectively arranged on the side wall of the first steel plate 2 and the square steel tube 1, and their sizes are smaller than the outer diameters of the first flange cap 6 and the second flange cap 7, so that the first flange cap 6 and the second flange cap can resist the perforation; at the same time, the inner diameters of the first connection hole 9 and the second connection hole 10 are larger than the outer diameter of the fixing screw 5, so that the fixing screw 5 can freely pass through the first connection hole 9 and the second connection hole 10, and then the square steel tube 1 and the cross H-shaped steel can be bolted together through the fastening assembly composed of the first flange cap 6, the second flange cap 7 and the fixing screw 5.

[0121] Further optimization scheme, the second steel plate 3 and the second steel plate 3 divide the inner cavity of the square steel tube 1 into several chambers, and the concrete 8 is filled in the chamber. The concrete 8 in the core of the square steel tube 1 is subject to the dual constraints of the cross H-shaped steel and the square steel tube 1, so that the strength and ductility of the core concrete 8 are significantly improved, so that the axial compression bearing capacity, bending bearing capacity and ductility and energy dissipation capacity of the component under seismic load can be effectively improved.

[0122] The present invention also discloses a construction method for a fully bolted cross H-shaped steel reinforced square steel tube concrete structure, comprising the following steps:

[0123] According to the design requirements, the square steel tube 1, the first steel plate 2, the second steel plate 3 and the third steel plate 4 are cut in sequence; then the second connecting hole 10 is opened on the outer wall of the square steel tube 1, the first connecting hole 9 is opened on the first steel plate 2, and the first flange cap 6 is welded to the position corresponding to the first connecting hole 9 on the first steel plate 2;

[0124] The first steel plate 2, the second steel plate 3 and the third steel plate 4 are welded together to form a cross H-shaped steel;

[0125] Insert the cross H-shaped steel into the square steel tube 1 for positioning and alignment;

[0126] The cross H-shaped steel and the square steel pipe 1 are bolted together by the fastening assembly; when bolting, the first connection hole 9 is aligned with the second connection hole 10, and then the fixing screw 5 is inserted, so that the fixing screw 5 is threadedly connected to the first flange cap 6, ensuring that the fixing screw 5 is effectively connected to the cross H-shaped steel inside the square steel pipe 1, and then the second flange cap 7 is threadedly connected to the fixing screw 5, and the tightening operation is performed to make the second flange cap 7 abut against the outer wall of the square steel pipe 1;

[0127] Pour concrete 8 between the inner cavity of the square steel tube 1 and the cross H-shaped steel; fill the cavity formed between the square steel tube 1 and the cross H-shaped steel with concrete 8, and perform vibration compaction;

[0128] The concrete 8 is cured to achieve the designed strength of the concrete 8 .

[0129] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0130] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A fully bolted cross H-steel reinforced square steel tube concrete structure, characterized in that: It comprises a square steel tube (1), wherein a cross H-shaped steel is arranged inside the square steel tube (1) for reinforcement, and the space between the cross H-shaped steel and the inner cavity of the square steel tube (1) is filled with concrete (8); The cross H-shaped steel comprises a plurality of first steel plates (2), wherein the first steel plates (2) are attached to the inner wall of the square steel tube (1), and one end of a second steel plate (3) and a third steel plate (4) are respectively fixedly connected to adjacent first steel plates (2), the other end of the second steel plate (3) is fixedly connected to the first steel plate (2) opposite thereto, and one end of the third steel plate (4) away from the first steel plate (2) is fixedly connected to the second steel plate (3); The square steel tube (1) is provided with a fastening assembly, and the fastening assembly bolts the first steel plate (2) to the inner wall of the square steel tube (1).

2. The fully bolted cross H-shaped steel reinforced square steel tube concrete structure according to claim 1 is characterized in that: The fastening assembly comprises a first flange cap (6) and a second flange cap (7) which are arranged correspondingly, wherein the first flange cap (6) is arranged inside the square steel pipe (1) and abuts against the first steel plate (2), and the second flange cap (7) is arranged outside the square steel pipe (1) and abuts against the square steel pipe (1), and a fixing screw (5) is arranged between the first flange cap (6) and the second flange cap (7).

3. The fully bolted cross H-shaped steel reinforced square steel tube concrete structure according to claim 2 is characterized in that: The first flange cap (6) is welded to the first steel plate (2).

4. The fully bolted cross H-shaped steel reinforced square steel tube concrete structure according to claim 2 is characterized in that: The first steel plate (2) is provided with a plurality of first connection holes (9), the first flange cap (6) is arranged corresponding to the first connection hole (9), and the fixing screw (5) passes through the first connection hole (9) and is threadedly connected to the first flange cap (6).

5. The fully bolted cross H-steel reinforced square steel tube concrete structure according to claim 4 is characterized in that: The side wall of the square steel tube (1) is penetrated by a plurality of second connection holes (10) arranged corresponding to the first connection holes (9); the second connection holes (10) are arranged corresponding to the second flange cap (7); the fixing screw (5) extends out of the second connection hole (10) and is threadedly connected to the second flange cap (7).

6. The fully bolted cross H-shaped steel reinforced square steel tube concrete structure according to claim 1, characterized in that: The second steel plate (3) and the third steel plate (4) divide the inner cavity of the square steel tube (1) into a plurality of chambers, and the concrete (8) is filled in the chambers.

7. A construction method for fully bolted cross H-steel reinforced square steel tube concrete structure, according to any one of claims 1 to 6, characterized in that The following steps are involved: Cutting a square steel tube (1), a first steel plate (2), a second steel plate (3) and a third steel plate (4) in sequence; The first steel plate (2), the second steel plate (3) and the third steel plate (4) are welded together to form a cross H-shaped steel; Insert the cross H-shaped steel into the square steel tube (1) for positioning and alignment; The cross H-shaped steel and the square steel pipe (1) are bolted together by a fastening assembly; pouring concrete (8) between the inner cavity of the square steel tube (1) and the cross H-shaped steel; The concrete (8) is cured to achieve the designed strength of the concrete (8).

8. The construction method of cross H-shaped steel reinforced square steel tube concrete according to claim 7, characterized in that: In the step of cutting the first steel plate (2) and the square steel tube (1), a second connection hole (10) is opened on the outer wall of the square steel tube (1), and a first connection hole (9) is opened on the first steel plate (2).

9. The construction method of cross H-shaped steel reinforced square steel tube concrete according to claim 8, characterized in that: The cross H-shaped steel is assembled and the first flange cap (6) is welded to a position on the first steel plate (2) corresponding to the first connection hole (9).

10. The construction method of cross H-shaped steel reinforced square steel tube concrete according to claim 9, characterized in that: When the fastening assembly is assembled with the cross H-shaped steel, the first connection hole (9) is aligned with the second connection hole (10), and then the fixing screw (5) is inserted so that the fixing screw (5) is threadedly connected to the first flange cap (6), and then the second flange cap (7) is threadedly connected to the fixing screw (5) so that the second flange cap (7) abuts against the outer wall of the square steel pipe (1).

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