Prefabricated assembly steel concrete composite beam and installation method

Abstract

The invention discloses a prefabricated assembly steel-concrete composite beam and a mounting method, and belongs to the technical field of building structures. According to the technical scheme, the high-performance formwork comprises a U-shaped outer shell, a U-shaped stainless steel pipe, a PBL plate in the U-shaped stainless steel pipe, I-shaped steel arranged in the U-shaped outer shell and a reinforcement cage; and the U-shaped shell is made of UHPC (Ultra High Performance Concrete). The mold shell has the beneficial effects that the mold shell is prefabricated in a factory and has the characteristics of high strength, crack resistance, fire resistance, corrosion resistance and the like. During construction, the installation of the composite beam can be completed only by pouring common concrete into the formwork in situ. By means of the formwork design, the bearing capacity, the anti-seismic performance, the structural ductility and the overall stability of the beam body are remarkably improved. By virtue of the advantages of simplicity and convenience in construction, excellent performance, cost saving, environment friendliness and the like, the method is suitable for the engineering fields of high-rise buildings, bridge construction, energy infrastructure and the like in coastal areas.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a prefabricated steel-concrete composite beam and an installation method. Background Art

[0002] By adopting prefabricated buildings, the overall quality of buildings can be improved, costs can be effectively controlled, and energy consumption can be reduced. However, traditional steel concrete beams and prefabricated structures still have some technical bottlenecks:

[0003] 1) Complex construction and heavy deadweight: Although steel is used to enhance the bearing capacity, the deadweight of steel-concrete beams is still large due to the presence of concrete. In high-rise buildings, the heavy deadweight will also bring more structural challenges. Heavier components also require more powerful lifting equipment during transportation and installation, which increases the difficulty and cost of construction.

[0004] 2) Low strength and poor corrosion resistance: The strength of steel-concrete beams is relatively low. If they need to be supported or load-bearing in buildings, larger steel beams are required to achieve the corresponding strength. Steel-concrete beams are not as corrosion-resistant as traditional concrete beams. If they are exposed to a humid and open environment for a long time, they may corrode, deteriorate, crack, and other problems.

[0005] 3) Insufficient utilization of high-performance materials: Although stainless steel has become the preferred material for structures in harsh environments due to its excellent corrosion resistance and strength, its high cost limits its application in large-scale construction. At the same time, UHPC (ultra-high performance concrete) has obvious advantages in reducing the cross-sectional size of components and improving structural performance due to its ultra-high mechanical properties and durability, but its brittle characteristics and material costs also limit its promotion.

[0006] Therefore, a new composite beam design is needed that can overcome the above technical defects while improving construction efficiency and reducing construction costs. Summary of the invention

[0007] In order to solve the above problems, the present invention proposes a prefabricated assembled steel-concrete composite beam and an installation method, which can improve the bearing capacity, crack resistance and deformation performance of the beam, improve the overall stability of the structure, enhance the corrosion resistance of the beam, and can effectively reduce on-site construction procedures. It has the advantages of high production efficiency, fast construction speed, good construction quality, etc., and can generate good economic benefits.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A prefabricated steel-concrete composite beam includes a high-performance formwork, wherein the high-performance formwork includes a U-shaped shell, a U-shaped stainless steel tube wrapped outside the U-shaped shell, a plurality of PBL plates arranged in the U-shaped stainless steel tube, an I-shaped steel arranged in the U-shaped shell, and a steel cage arranged in the U-shaped shell; the use of steel sections can significantly enhance the structural performance, and the steel sections can improve the bending and shearing capabilities of the beam, increase the overall rigidity, reduce deformation, and enhance structural stability and seismic performance. The prefabricated nature of the steel sections speeds up construction, reduces on-site operation time, and shortens the project duration. Reasonable configuration of steel sections can also reduce deadweight and improve structural efficiency, and is particularly suitable for high-rise buildings and bridge projects;

[0010] The U-shaped shell is made of UHPC ultra-high performance concrete. As an ultra-high performance material, UHPC has the advantages of high strength, high toughness, good durability, and not easy to develop cracks. It has certain advantages in reducing the cross-sectional size of components, reducing the deadweight of the structure, and improving the stress performance of the structure.

[0011] The U-shaped shell is filled with ordinary concrete. Ordinary concrete needs to be cast in situ after the high-performance formwork is prefabricated. After the high-performance formwork is prefabricated, it is transported to the construction site, and then ordinary concrete is poured on site to achieve the overall connection of the structure. The combination of high-performance formwork and post-cast concrete can also improve the mechanical properties of the nodes, provide better seismic resistance and overall stability. This method can not only improve construction efficiency and shorten construction period, but also enhance the integrity and durability of the structure.

[0012] The outer surface of the U-shaped shell is wrapped with a U-shaped stainless steel tube, which provides excellent corrosion resistance and can effectively protect the internal beam from environmental factors such as moisture, salt spray, chemicals, etc., which is particularly important for buildings located in coastal areas or industrial environments. For steel-concrete beams, the external stainless steel wrapping layer can act as a barrier to prevent moisture and oxygen from penetrating into the concrete, thereby slowing down the corrosion process of the internal steel bars;

[0013] The U-shaped outer shell is located at both ends of the U-shaped stainless steel tube, and the PBL plate is arranged on the inner wall of the U-shaped stainless steel tube.

[0014] The PBL plates are evenly arranged along the inside of the U-shaped stainless steel tube and welded inside the U-shaped stainless steel tube.

[0015] The U-shaped housing is in a U-shape;

[0016] The U-shaped stainless steel pipe is arranged in a U shape, and the U-shaped stainless steel pipe comprises a bottom plate and side plates arranged at both ends of the upper surface of the bottom plate, and the PBL plates are arranged on the side walls opposite to the bottom plate and the two side plates. On the one hand, the PBL plate can effectively transmit shear force, and on the other hand, it can improve the connection quality between the U-shaped stainless steel pipe and concrete, delay the buckling of the U-shaped stainless steel pipe, and improve the integrity and stability of the structure.

[0017] The steel cage is located outside the I-shaped steel.

[0018] The steel cage consists of longitudinal steel bars and a number of annular stirrups distributed along the length of the longitudinal steel bars. The steel cage can significantly enhance the bearing capacity and ductility of the structure, effectively disperse the load and prevent local stress concentration by providing high-strength tensile support. The steel bars and concrete work together to improve seismic resistance and durability, reduce crack formation, and prevent steel corrosion. The steel cage can ensure the integrity and construction quality of the concrete, while optimizing material use, simplifying the construction process, and speeding up progress.

[0019] The installation method based on prefabricated steel-concrete composite beams includes the following steps:

[0020] S1: Transport the prefabricated high-performance formwork to the construction site;

[0021] To ensure that the formwork is not damaged during transportation, take appropriate fixing measures;

[0022] After arriving at the construction site, arrange the high-performance formwork in the predetermined position and order, and use a crane or other lifting equipment to accurately place the high-performance formwork in place;

[0023] S2: Side formwork is set on both sides of the high-performance formwork. The side formwork maintains the shape of concrete during pouring and provides support. The installation of the side formwork must be firm and reliable to prevent leakage during pouring.

[0024] S3: Pour ordinary concrete to fill the high-performance formwork, and pay attention to vibrating and compacting to remove air bubbles in the concrete to ensure that the final composite beam has excellent integrity and mechanical properties. After the curing is completed, remove the lateral formwork to complete the installation of the composite beam.

[0025] In step S1, a prefabricated high-performance formwork is prepared in a factory, and the specific steps are as follows:

[0026] 1) Arrange the PBL plates evenly along the inside of the U-shaped stainless steel tube; in order to ensure a firm connection between the PBL plates and the U-shaped stainless steel tube, a high-quality welding process must be used to firmly attach the PBL plates to the inner wall of the U-shaped stainless steel tube;

[0027] 2) Prepare suitable I-shaped steels as well as longitudinal steel bars and circular stirrups for forming the steel cage according to the size requirements on the design drawings; the selection of materials must comply with relevant building standards, and precise measuring tools and techniques should be used when cutting and bending these steels to ensure that they can be assembled into the required structure accurately;

[0028] 3) Place the U-shaped stainless steel pipe welded with the PBL plate on a pre-laid support system; the setting of the support system should take into account the load and deformation that may occur in subsequent processes, so as to provide sufficient rigidity and stability;

[0029] 4) Use hoisting equipment to hoist the pre-prepared I-beam into the U-shaped stainless steel pipe welded with the PBL plate, accurately hoist it to the designated position, and temporarily fix it with a bracket to ensure its stability during the entire construction process and avoid any accidental movement or tilting;

[0030] 5) Install longitudinal reinforcements around the I-beam in the U-shaped stainless steel tube according to predetermined positions and tie them with annular stirrups at designed spacing to form a complete reinforcement cage;

[0031] 6) Place a hollow inner form at the designated position inside the beam and set up lateral formwork on both sides of the beam;

[0032] The ultra-high performance concrete is poured and formed in one step. After it reaches a certain strength, the inner mold and side molds are removed to form a U-shaped shell, completing the prefabrication of the high-performance shell.

[0033] The support system includes a bottom plate, a support rod, an L-shaped support plate, and a movable vertical plate;

[0034] The L-shaped support plate includes a horizontal plate and a vertical plate arranged at one end of the upper surface of the horizontal plate;

[0035] The support rod 1 is configured as an electric telescopic rod, the fixed end of the support rod 1 is fixedly disposed on the upper surface of the bottom plate, and the telescopic end of the support rod 1 is fixedly connected to the lower surface of the horizontal plate;

[0036] A slide groove is provided at one end of the upper surface of the horizontal plate, the bottom of the movable vertical plate abuts against the upper surface of the horizontal plate, and a slider is also provided at the bottom of the movable vertical plate, and the slider is slidably matched with the slide groove;

[0037] The U-shaped stainless steel pipe is arranged between the vertical plate of the L-shaped support plate and the movable vertical plate;

[0038] A horizontal fixed plate is arranged at the bottom of the side wall of the movable vertical plate away from the vertical plate, a number of evenly distributed threaded holes are opened on the upper surface of the horizontal plates on both sides of the slide groove, a number of matching threaded holes are opened on the fixed plate, and the threaded holes on the upper surface of the horizontal plate are fixedly connected with the threaded holes on the fixed plate by bolts to fix the movable vertical plate, thereby clamping the U-shaped stainless steel pipe between the vertical plate of the L-shaped support plate and the movable vertical plate.

[0039] The brackets are arranged on both sides of the support system;

[0040] The bracket includes a base, a second support rod, a third support rod, a connecting plate, an I-beam support plate, and a longitudinal steel bar limiting ring;

[0041] The second support rod and the third support rod are both configured as electric telescopic rods;

[0042] The fixed end of the second support rod is fixedly arranged on the upper surface of the base, and one side of the telescopic end of the second support rod is fixedly connected to the fixed end of the third support rod;

[0043] The telescopic end of the support rod 3 is fixedly connected to the connecting plate, and an I-beam support plate is arranged on one side of the connecting plate. The I-beam support plate includes two L-shaped plates, and the L-shaped plates are matched with the inner sides of the I-beam respectively;

[0044] The longitudinal steel bar limiting rings are arranged at the four corners of the connecting plate, and the longitudinal steel bar limiting rings match the longitudinal steel bars.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] First of all, ultra-high performance concrete (UHPC) is a new type of material that is reinforced by optimizing its composition and adding fiber. It has extremely high compressive strength and significantly improved tensile strength. Its low porosity gives it excellent waterproofness and chemical durability, effectively preventing steel corrosion. UHPC also exhibits excellent toughness. UHPC can reduce the deadweight of the structure. It is suitable for prefabricated components and can improve construction efficiency. UHPC's long life and low maintenance requirements make it an attractive choice in modern construction.

[0047] Secondly, the stainless steel shell provides excellent corrosion resistance, effectively protecting the internal concrete and steel from the external environment, especially in environments with severe moisture, salt spray or chemical attack. This protection extends the service life of the structure and reduces maintenance needs. Its high strength and toughness enhance the overall stability of the concrete structure, allowing it to better withstand heavy loads and impact forces, making it suitable for critical infrastructure such as bridges and high-rise buildings.

[0048] In addition, the use of steel can significantly enhance structural performance. Steel can improve the bending and shear resistance of beams, increase overall stiffness, reduce deformation, and improve structural stability and seismic performance. Steel can also prevent premature cracks, improve durability, and protect internal steel bars from corrosion. The prefabricated nature of steel can also speed up construction, reduce on-site work time, and shorten project duration. Rational configuration of steel can also reduce deadweight and improve structural efficiency, which is particularly suitable for high-rise buildings and bridge projects.

[0049] The beam combines the excellent properties of ultra-high performance concrete (UHPC) and stainless steel shell. The stainless steel shell provides the first physical barrier to resist corrosion and environmental damage, while the low porosity of UHPC further enhances durability and resistance to chemical attack. This combination significantly improves the strength, toughness and seismic performance of the beam, and this combination has high prefabrication potential and is easy to construct, making it suitable for key structures such as bridges and high-rise buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0051] Figure 1 It is an overall schematic diagram of the prefabricated steel-concrete composite beam and the installation method according to an embodiment of the present invention.

[0052] Figure 2 It is a schematic cross-sectional view of a prefabricated steel-concrete composite beam and an installation method according to an embodiment of the present invention.

[0053] Figure 3 Schematic diagram of U-shaped stainless steel tube welded with PBL plate for prefabricated steel-concrete composite beam and installation method.

[0054] Figure 4 Schematic diagram of the reinforcement cage for prefabricated steel-concrete composite beams and their installation method.

[0055] Figure 5 It is a schematic diagram of the structure of the support system and the bracket according to an embodiment of the present invention.

[0056] Figure 6 for Figure 5 A partial enlarged view of .

[0057] Figure 7 Schematic diagram of the structure of the bracket according to the embodiment of the present invention.

[0058] The reference numerals are: 1. U-shaped stainless steel tube; 2. PBL plate; 3. steel section; 4. U-shaped shell; 5. steel cage; 6. ordinary concrete;

[0059] 21. Bottom plate; 22. Support rod 1; 23. L-shaped support plate; 24. Moving vertical plate; 25. Slide groove; 26. Sliding block; 27. Fixed plate;

[0060] 31. Base; 32. Support rod 2; 33. Support rod 3; 34. Connecting plate; 35. I-beam support plate; 36. Longitudinal steel bar limiting ring. DETAILED DESCRIPTION

[0061] 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0062] Example 1

[0063] See also Figures 1 to 4 The present embodiment provides a prefabricated steel-concrete composite beam and an installation method. The design and construction method are described in detail. The composite beam includes a U-shaped stainless steel pipe 1, a PBL plate 2, an I-shaped steel 3, a U-shaped shell 4, a steel cage 5 and ordinary concrete 6.

[0064] Combination Figure 1 , Figure 2 and Figure 3 The U-shaped stainless steel tube 1 is wrapped around the outer surface of the U-shaped shell 4 to protect the ultra-high performance concrete from external environmental erosion. The PBL plates 2 are evenly arranged on the inner surface of the U-shaped stainless steel tube 1. The PBL plates 2 are evenly distributed along the length direction of the U-shaped stainless steel tube 1 and are fixed to the U-shaped stainless steel tube 1 by welding. The PBL plates 2 are designed as steel plates with circular holes. On the one hand, the PBL plates 2 can effectively transmit shear force. On the other hand, they can improve the connection quality between the U-shaped stainless steel tube 1 and the concrete, delay the buckling of the U-shaped stainless steel tube 1, and improve the overall performance of the structure.

[0065] Combination Figure 1 and Figure 2 The use of I-beam 3 can improve the bending and shear resistance of the beam, increase the overall stiffness, reduce deformation, improve structural stability and seismic performance. I-beam 3 can also prevent cracks from occurring prematurely, improve durability, and protect internal steel bars from corrosion.

[0066] Combination Figure 1 and Figure 2 The U-shaped shell 4 is the core structure of the composite beam, and adopts ultra-high performance concrete, which has the advantages of high strength, high toughness, good durability, and not easy to develop cracks. It can be used in bending members to effectively improve the crack resistance and deformation performance.

[0067] Combination Figure 4 , the steel cage 5 can ensure the integrity and construction quality of the concrete, optimize the use of materials, simplify the construction process, and speed up the progress. At the same time, the steel cage 5 enhances the bearing capacity and ductility of the structure, effectively disperses the load and prevents local stress concentration by providing high-strength tensile support. The steel bars work synergistically with concrete to improve seismic performance and durability, reduce crack formation, and prevent steel corrosion. By increasing the number and density of stirrups at both ends of the beam, the shear resistance and local bearing capacity of these areas can be effectively enhanced.

[0068] In order to better achieve the above-mentioned purpose of the invention, this embodiment also provides an installation method based on prefabricated steel-concrete composite beams, comprising the following steps:

[0069] S1: Transport the prefabricated high-performance formwork to the construction site;

[0070] To ensure that the formwork is not damaged during transportation, take appropriate fixing measures;

[0071] After arriving at the construction site, arrange the high-performance formwork in the predetermined position and order, and use a crane or other lifting equipment to accurately place the high-performance formwork in place;

[0072] S2: Side formwork is set on both sides of the high-performance formwork. The side formwork maintains the shape of concrete during pouring and provides support. The installation of the side formwork must be firm and reliable to prevent leakage during pouring.

[0073] S3: pour ordinary concrete 6 to fill the high-performance formwork, and pay attention to vibrating and compacting to remove air bubbles in the concrete to ensure that the final composite beam has excellent integrity and mechanical properties. After the curing is completed, remove the lateral formwork to complete the installation of the composite beam.

[0074] In step S1, a prefabricated high-performance formwork is prepared in a factory, and the specific steps are as follows:

[0075] 1) The PBL plates 2 are evenly arranged along the inside of the U-shaped stainless steel tube 1; in order to ensure a stable connection between the PBL plates 2 and the U-shaped stainless steel tube 1, a high-quality welding process must be used to make the PBL plates 2 firmly attached to the inner wall of the U-shaped stainless steel tube 1;

[0076] 2) Prepare suitable I-shaped steel 3 and longitudinal steel bars and annular stirrups for forming the steel cage 5 according to the size requirements on the design drawings; the selection of materials must comply with relevant building standards, and precise measuring tools and techniques should be used when cutting and bending these steels to ensure that they can be assembled into the required structure accurately;

[0077] 3) Place the U-shaped stainless steel pipe 1 welded with the PBL plate 2 on a pre-laid support system; the setting of the support system should take into account the load and deformation that may occur in subsequent processes, so as to provide sufficient rigidity and stability;

[0078] 4) Use the hoisting equipment to hoist the pre-prepared I-beam steel 3 into the U-shaped stainless steel pipe 1 welded with the PBL plate 2, accurately hoist it to the designated position, and temporarily fix it with a bracket to ensure its stability during the entire construction process and avoid any accidental movement or tilting;

[0079] 5) Install longitudinal reinforcements around the I-shaped steel 3 in the U-shaped stainless steel tube 1 according to predetermined positions and tie them with annular stirrups at designed intervals to form a complete reinforcement cage;

[0080] 6) Place a hollow inner form at the designated position inside the beam and set up lateral formwork on both sides of the beam;

[0081] The ultra-high performance concrete is poured and formed once, and when it reaches a certain strength, the inner mold and the side mold are removed to form a U-shaped outer shell 4, completing the prefabrication of the high-performance mold shell.

[0082] Example 2

[0083] Based on Example 1, the support system includes a base plate 21, a support rod 22, an L-shaped support plate 23, and a movable vertical plate 24; see Figure 5 , Figure 6 ;

[0084] The L-shaped support plate 23 includes a horizontal plate and a vertical plate arranged at one end of the upper surface of the horizontal plate;

[0085] The support rod 22 is configured as an electric telescopic rod, the fixed end of the support rod 22 is fixedly disposed on the upper surface of the bottom plate 21, and the telescopic end of the support rod 22 is fixedly connected to the lower surface of the horizontal plate;

[0086] A slide groove 25 is provided at one end of the upper surface of the horizontal plate, the bottom of the movable vertical plate 24 abuts against the upper surface of the horizontal plate, and a slider 26 is also provided at the bottom of the movable vertical plate 24, and the slider 26 is slidably matched with the slide groove 25;

[0087] A U-shaped stainless steel pipe 1 is arranged between the vertical plate of the L-shaped support plate 23 and the movable vertical plate 24;

[0088] A horizontal fixed plate 27 is provided at the bottom of the side wall of the movable vertical plate 24 away from the vertical plate. A number of evenly distributed threaded holes are provided on the upper surface of the horizontal plates on both sides of the slide groove 25, and a number of matching threaded holes are provided on the fixed plate 27. The threaded holes on the upper surface of the horizontal plate are fixedly connected with the threaded holes on the fixed plate 27 by bolts to fix the movable vertical plate 24, thereby clamping the U-shaped stainless steel pipe 1 between the vertical plate of the L-shaped support plate 23 and the movable vertical plate 24.

[0089] Embodiment 2 provides a stable support for the U-shaped stainless steel tube by setting an adjustable support system, ensuring its stability during the prefabrication process and preventing deformation. At the same time, it is convenient to adjust and fix according to the size of the U-shaped stainless steel tube, improves the prefabrication accuracy, and lays the foundation for subsequent processes.

[0090] The support system consisting of the bottom plate, support rod 1, L-shaped support plate, and movable vertical plate provides stable support for the U-shaped stainless steel pipe. The support rod 1 of the electric telescopic rod can adjust the height according to actual needs, so that the support system can adapt to U-shaped stainless steel pipes of different sizes and weights, ensuring its stability during the prefabrication process and preventing structural damage caused by load or deformation.

[0091] The slide groove on the horizontal plate matches the slider at the bottom of the movable vertical plate, so that the movable vertical plate can slide along the slide groove, which is convenient for position adjustment according to the width of the U-shaped stainless steel pipe. The fixed plate is connected to the horizontal plate by bolts, which can firmly fix the movable vertical plate, so that the U-shaped stainless steel pipe is tightly clamped between the vertical plate of the L-shaped support plate and the movable vertical plate, further enhancing the stability of the support and providing a solid foundation for subsequent processes such as I-beam hoisting and steel cage installation.

[0092] The support system can accurately position and fix the U-shaped stainless steel tube, which helps to improve the accuracy of the prefabricated high-performance formwork. When pouring ultra-high performance concrete to form the U-shaped shell, the stable support can prevent the U-shaped stainless steel tube from displacement or deformation, thereby ensuring that the shape and size of the U-shaped shell meet the design requirements and improve the quality and performance of the entire prefabricated assembled steel-concrete composite beam.

[0093] Example 3

[0094] Based on Example 2, the brackets are arranged on both sides of the support system;

[0095] The bracket includes a base 31, a second support rod 32, a third support rod 33, a connecting plate 34, an I-beam support plate 35, and a longitudinal steel bar limiting ring 36; see Figure 7 ;

[0096] Support rod 2 32 and support rod 3 33 are both configured as electric telescopic rods;

[0097] The fixed end of the second support rod 32 is fixedly arranged on the upper surface of the base 31, and one side of the telescopic end of the second support rod 32 is fixedly connected to the fixed end of the third support rod 33;

[0098] The telescopic end of the support rod 33 is fixedly connected to the connecting plate 34, and an I-beam support plate 35 is arranged on one side of the connecting plate 34. The I-beam support plate 35 includes two L-shaped plates, and the L-shaped plates are matched with the inner sides of the I-beam 3 respectively;

[0099] Longitudinal steel bar limiting rings 36 are provided at the four corners of the connecting plate 34 , and the longitudinal steel bar limiting rings 36 match the longitudinal steel bars.

[0100] The bracket design of Example 3 enhances the stability and positioning accuracy of the I-beam and the steel cage, simplifies the installation process, improves construction efficiency and quality, and ensures that the prefabricated steel-concrete composite beam meets high-standard building requirements.

[0101] The bracket is set on both sides of the support system, and provides additional support for the I-beam through the structure composed of the base, support rod 2, support rod 3, and connecting plate. The support rod 2 and support rod 3 of the electric telescopic rod can adjust the height, so that the I-beam support plate can fit closely with the inner side of the I-beam, effectively preventing the I-beam from shaking and shifting during the hoisting and prefabrication process, ensuring that it is stably in the predetermined position, and improving the assembly accuracy and overall stability of the structure.

[0102] The longitudinal reinforcement limit rings set at the four corners of the connecting plate match the longitudinal reinforcement and can accurately position and limit the longitudinal reinforcement. When installing the reinforcement cage, the limit rings can ensure that the longitudinal reinforcement is arranged according to the designed spacing and position, avoiding the displacement or distortion of the reinforcement, thereby ensuring the overall quality and performance of the reinforcement cage, enabling it to work better with concrete and enhance the bearing capacity and seismic performance of the composite beam.

[0103] The design of the bracket simplifies the installation process of I-beams and steel cages, reduces the workload of manual adjustment and calibration, and improves construction efficiency. At the same time, precise positioning and stable support help reduce construction errors, improve the construction quality of prefabricated steel-concrete composite beams, ensure that they meet high-standard construction requirements, and provide reliable guarantees for subsequent on-site installation and use.

[0104] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A prefabricated steel-concrete composite beam, characterized in that: The high-performance formwork comprises a U-shaped shell (4), a U-shaped stainless steel tube (1) wrapped outside the U-shaped shell (4), a plurality of PBL plates (2) arranged in the U-shaped stainless steel tube (1), an I-shaped steel (3) arranged in the U-shaped shell (4), and a steel cage (5) arranged in the U-shaped shell (4); The U-shaped shell (4) is made of UHPC ultra-high performance concrete; The interior of the U-shaped shell (4) is filled with ordinary concrete (6).

2. The prefabricated steel-concrete composite beam according to claim 1 is characterized in that: The outer surface of the U-shaped outer shell (4) is wrapped with a U-shaped stainless steel tube (1), the U-shaped outer shell (4) is located at both ends of the U-shaped stainless steel tube (1), and the PBL plate (2) is arranged on the inner wall of the U-shaped stainless steel tube (1).

3. The prefabricated steel-concrete composite beam according to claim 2 is characterized in that: The PBL plates (2) are evenly arranged along the inside of the U-shaped stainless steel tube (1) and welded inside the U-shaped stainless steel tube (1).

4. The prefabricated steel-concrete composite beam according to claim 1 is characterized in that: The U-shaped housing (4) is in a U-shape; The U-shaped stainless steel tube (1) is arranged in a U shape, and comprises a bottom plate and side plates arranged at both ends of the upper surface of the bottom plate, and the PBL plates (2) are arranged on the opposite side walls of the bottom plate and the two side plates.

5. The prefabricated steel-concrete composite beam according to claim 1 is characterized in that: The steel cage (5) is located outside the I-shaped steel (3).

6. The prefabricated steel-concrete composite beam according to claim 1, characterized in that: The steel cage (5) is composed of longitudinal steel bars and a plurality of annular stirrups distributed along the length direction of the longitudinal steel bars.

7. A method for installing a prefabricated steel-concrete composite beam according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Transport the prefabricated high-performance formwork to the construction site; To ensure that the formwork is not damaged during transportation, take appropriate fixing measures; After arriving at the construction site, arrange the high-performance formwork according to the predetermined position and sequence, and use a crane to accurately place the high-performance formwork in place; S2: Side formwork is set on both sides of the high-performance formwork. The side formwork maintains the shape of the concrete during the pouring process and provides support; S3: pouring ordinary concrete (6) to fill the high-performance formwork, removing air bubbles in the concrete, and after the curing is completed, removing the lateral formwork to complete the installation of the composite beam.

8. The method for installing a prefabricated steel-concrete composite beam according to claim 7, characterized in that: In step S1, a prefabricated high-performance formwork is prepared in a factory, and the specific steps are as follows: 1) The PBL plates (2) are evenly arranged along the inside of the U-shaped stainless steel tube (1); 2) According to the size requirements on the design drawings, prepare suitable I-shaped steel (3) and longitudinal steel bars and annular stirrups for forming a steel cage (5); 3) placing the U-shaped stainless steel pipe (1) welded with the PBL plate (2) on a pre-laid support system; the setting of the support system should take into account the load and deformation that may occur in subsequent processes, so as to provide sufficient rigidity and stability; 4) Using hoisting equipment, hoist the pre-prepared I-shaped steel (3) into the U-shaped stainless steel pipe (1) welded with the PBL plate (2), hoist it to the designated position, and temporarily fix it with a bracket; 5) installing longitudinal reinforcements around the I-shaped steel (3) located in the U-shaped stainless steel tube (1) at predetermined positions and tying them with annular stirrups at designed intervals to form a complete reinforcement cage; 6) Place a hollow inner form at the designated position inside the beam and set up lateral formwork on both sides of the beam; The ultra-high performance concrete is poured and formed in one step, and when it reaches a certain strength, the inner form and the side form are removed to form a U-shaped outer shell (4), thus completing the prefabrication of the high-performance formwork.

9. The method for installing a prefabricated steel-concrete composite beam according to claim 8, characterized in that: The support system comprises a bottom plate (21), a support rod (22), an L-shaped support plate (23), and a movable vertical plate (24); The L-shaped support plate (23) comprises a horizontal plate and a vertical plate arranged on one end of the upper surface of the horizontal plate; The support rod 1 (22) is configured as an electric telescopic rod, the fixed end of the support rod 1 (22) is fixedly arranged on the upper surface of the bottom plate (21), and the telescopic end of the support rod 1 (22) is fixedly connected to the lower surface of the horizontal plate; A slide groove (25) is provided at one end of the upper surface of the horizontal plate, the bottom of the movable vertical plate (24) abuts against the upper surface of the horizontal plate, and a slider (26) is also provided at the bottom of the movable vertical plate (24), and the slider (26) is slidably matched with the slide groove (25); The U-shaped stainless steel pipe (1) is arranged between the upright plate of the L-shaped support plate (23) and the movable vertical plate (24); A horizontal fixing plate (27) is arranged at the bottom of the side wall of the movable vertical plate (24) away from the vertical plate. A plurality of evenly distributed threaded holes are provided on the upper surface of the horizontal plates on both sides of the slide groove (25). A plurality of matching threaded holes are provided on the fixing plate (27). The threaded holes on the upper surface of the horizontal plate and the threaded holes on the fixing plate (27) are fixedly connected by bolts to fix the movable vertical plate (24), thereby clamping the U-shaped stainless steel pipe (1) between the vertical plate of the L-shaped support plate (23) and the movable vertical plate (24).

10. The method for installing a prefabricated steel-concrete composite beam according to claim 9, characterized in that: The brackets are arranged on both sides of the support system; The support comprises a base (31), a second support rod (32), a third support rod (33), a connecting plate (34), an I-beam support plate (35), and a longitudinal steel bar limiting ring (36); The second support rod (32) and the third support rod (33) are both configured as electric telescopic rods; The fixed end of the second support rod (32) is fixedly arranged on the upper surface of the base (31), and one side of the telescopic end of the second support rod (32) is fixedly connected to the fixed end of the third support rod (33); The telescopic end of the support rod 3 (33) is fixedly connected to the connecting plate (34), and an I-beam support plate (35) is arranged on one side of the connecting plate (34), and the I-beam support plate (35) includes two L-shaped plates, and the L-shaped plates are matched with the inner sides of the I-beam (3) respectively; The longitudinal steel bar limiting rings (36) are arranged at the four corners of the connecting plate (34), and the longitudinal steel bar limiting rings (36) match the longitudinal steel bars.

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