Prefabricated assembly steel-concrete composite beam and installation method

Abstract

The application discloses a prefabricated assembly steel concrete composite beam and a mounting method, and belongs to the technical field of building structures; the technical scheme is as follows: the prefabricated assembly steel concrete composite beam comprises a high-performance formwork, the high-performance formwork comprises a U-shaped shell, a U-shaped stainless steel pipe, a PBL plate in the U-shaped stainless steel pipe, an I-shaped steel arranged in the U-shaped shell and a steel reinforcement cage; the U-shaped shell is made of UHPC (ultra-high performance concrete). The prefabricated assembly steel concrete composite beam has the advantages that the formwork is prefabricated in a factory, has the characteristics of high strength, crack resistance, fire resistance and corrosion resistance, and the like; during construction, only ordinary concrete needs to be poured on site to fill the inside of the formwork, so that the mounting of the composite beam can be completed; the formwork design significantly improves the bearing capacity, the anti-seismic performance, the structural ductility and the overall stability of the beam body; and the prefabricated assembly steel concrete composite beam has the advantages of simple construction, excellent performance, cost saving and environmental friendliness, and is suitable for engineering fields such as high-rise buildings in coastal areas, bridge construction and energy infrastructure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structures, and in particular to a prefabricated assembly steel-concrete composite beam and a mounting method. BACKGROUND

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

[0003] 1) Complex construction, heavy weight: Although steel is used to enhance the bearing capacity, the weight of the steel-concrete beam is still large due to the presence of concrete. In high-rise buildings, the large weight also brings more structural challenges. The heavy components also require more powerful lifting equipment during transportation and installation, increasing the difficulty and cost of construction.

[0004] 2) Low strength, poor corrosion resistance: The strength of steel-concrete is relatively low, and if it needs to be supported or supported in the building, larger steel materials need to be used to achieve the corresponding strength. Steel-concrete beams do not have good corrosion resistance like traditional concrete beams, and long-term exposure to humid, open environments can cause corrosion, degradation, cracking, and other problems.

[0005] 3) Inefficient use of high-performance materials: Although stainless steel is an excellent corrosion-resistant and strong material for structures in harsh environments, 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 high mechanical properties and durability, but its brittle characteristics and material cost also limit its promotion.

[0006] Therefore, a new type of composite beam design is needed to overcome the above technical defects while improving construction efficiency and reducing costs. SUMMARY

[0007] To solve the above problems, the present application proposes a prefabricated assembly steel-concrete composite beam and a mounting 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, effectively reduce the on-site construction process, have high production efficiency, fast construction speed, good construction quality and other advantages, and can produce good economic benefits.

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

[0009] A prefabricated steel-concrete composite beam comprises a high-performance formwork, which comprises a U-shaped shell, a U-shaped stainless steel pipe wrapped outside the U-shaped shell, a plurality of PBL plates arranged in the U-shaped stainless steel pipe, an I-shaped steel arranged in the U-shaped shell, and a steel reinforcement cage arranged in the U-shaped shell; the use of the steel can significantly enhance the structural performance, improve the bending and shearing capacity of the beam, increase the overall stiffness, reduce the deformation, and improve the structural stability and seismic performance. The prefabricated characteristics of the steel accelerate the construction speed, reduce the on-site operation time, and shorten the project period. Reasonable allocation of the steel can also reduce the self-weight, improve the structural efficiency, and is particularly suitable for high-rise buildings and bridge engineering;

[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 difficulty in developing cracks, and has certain advantages in reducing the cross-sectional size of the component, reducing the structural self-weight, and improving the structural stress performance;

[0011] The U-shaped shell is internally poured with ordinary concrete filling. The ordinary concrete needs to be cast in place after the prefabrication of the high-performance formwork. After the prefabrication of the high-performance formwork is completed, it is transported to the construction site, and then the on-site pouring of the ordinary concrete is carried out to realize the overall connection of the structure. The combination of the high-performance formwork and the post-cast concrete can also improve the mechanical properties at the joint, provide better seismic capacity and overall stability. This method not only improves the construction efficiency and shortens the construction period, but also enhances the integrity and durability of the structure.

[0012] The outer surface of the U-shaped shell is wrapped with a U-shaped stainless steel pipe, which provides excellent corrosion resistance and can effectively protect the internal beam body 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 composite 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 reinforcement;

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

[0014] The PBL plates are uniformly arranged in the U-shaped stainless steel pipe and welded in the U-shaped stainless steel pipe.

[0015] The shape of the U-shaped shell is U-shaped;

[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. The opposite side walls of the bottom plate and the two side plates are each provided with the PBL plate. On the one hand, the PBL plate can effectively transmit shear force, and on the other hand, the connection quality between the U-shaped stainless steel pipe and the concrete can be improved, the buckling of the U-shaped stainless steel pipe can be delayed, and the overall integrity and stability of the structure can be improved.

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

[0018] The steel reinforcement cage is composed of longitudinal steel bars and a plurality of ring-shaped stirrups distributed along the length direction of the longitudinal steel bars. The steel reinforcement cage can significantly enhance the carrying 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 the concrete work together to improve the seismic performance and durability, reduce crack formation, and prevent steel bar corrosion. The steel reinforcement cage can ensure the integrity and construction quality of the concrete, while optimizing material use, simplifying construction procedures, and accelerating progress.

[0019] The installation method of the prefabricated steel-concrete composite beam is based on the installation method of the prefabricated steel-concrete composite beam, comprising the following steps:

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

[0021] In order to ensure that the formwork is not damaged during transportation, appropriate fixing measures are taken;

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

[0023] S2: Set up lateral formwork on both sides of the high-performance formwork, which maintains the shape of the concrete during pouring and provides support; the installation of the lateral 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 vibration and compaction to remove air bubbles in the concrete, so that the final formed composite beam has excellent overall integrity and mechanical properties. After curing is completed, remove the lateral formwork, and the installation of the composite beam is completed.

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

[0026] 1) Uniformly arrange PBL plates inside the U-shaped stainless steel pipe; in order to ensure the stable connection between the PBL plates and the U-shaped stainless steel pipe, high-quality welding process must be used to make the PBL plates firmly adhere to the inner wall of the U-shaped stainless steel pipe;

[0027] 2) According to the size requirements on the design drawings, prepare suitable I-shaped steel and longitudinal reinforcement and ring-shaped stirrups for constituting the reinforcement cage; the selection of materials shall comply with relevant building standards, and when cutting and bending these steels, accurate measuring tools and techniques shall be used to ensure that they can be accurately assembled into the required structure;

[0028] 3) Place the U-shaped stainless steel pipe with welded PBL plate on a pre-laid support system; the support system shall be arranged in consideration of the load and deformation that may be generated in subsequent processes, so as to provide sufficient rigidity and stability;

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

[0030] 5) Install longitudinal reinforcement around the I-shaped steel located in the U-shaped stainless steel pipe according to the predetermined position, and bind it with ring-shaped stirrups at the designed interval to form a complete reinforcement cage;

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

[0032] Pour the ultra-high performance concrete, after one-time pouring and forming, remove the inner mold and the lateral formwork when it reaches a certain strength, thereby forming a U-shaped outer shell and completing the prefabrication of the high-performance formwork.

[0033] The support system comprises a base plate, a support rod one, an L-shaped support plate, and a movable vertical plate;

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

[0035] The support rod one is arranged as an electric telescopic rod, and the fixed end of the support rod one is fixedly arranged on the upper surface of the base plate, and the telescopic end of the support rod one is fixedly connected with the lower surface of the horizontal plate;

[0036] One end of the upper surface of the horizontal plate is provided with a sliding groove, the bottom of the movable vertical plate abuts against the upper surface of the horizontal plate, and the bottom of the movable vertical plate is further provided with a sliding block which is in sliding fit with the sliding 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] The bottom of the side wall of the moving vertical plate away from the side of the vertical plate is provided with a horizontal fixing plate, a plurality of uniformly distributed threaded holes are formed in the upper surface of the transverse plate on both sides of the chute, a plurality of matching threaded holes are formed in the fixing plate, the threaded holes in the upper surface of the transverse plate and the threaded holes in the fixing plate are fixedly connected through bolts, the fixing of the moving vertical plate is realized, and the U-shaped stainless steel pipe is clamped between the vertical plate of the L-shaped supporting plate and the moving vertical plate.

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

[0040] The support comprises a base, a support rod two, a support rod three, a connecting plate, an I-steel supporting plate and a longitudinal steel bar limiting ring;

[0041] The support rod two and the support rod three are both arranged as electric telescopic rods;

[0042] The fixed end of the support rod two is fixedly arranged on the upper surface of the base, and the telescopic end of the support rod two is fixedly connected with the fixed end of the support rod three;

[0043] The telescopic end of the support rod three is fixedly connected with the connecting plate, the I-steel supporting plate is arranged on one side of the connecting plate, and the I-steel supporting plate comprises two L-shaped plates matched with the inner sides of the I-shaped steel respectively;

[0044] The longitudinal steel bar limiting ring is arranged at the four corners of the connecting plate and matched with the longitudinal steel bar.

[0045] Compared with the prior art, the beneficial effects of the present application are that:

[0046] Firstly, the ultra-high performance concrete (UHPC) is a new type of material with optimized ingredients and added fiber reinforcement, which has extremely high compressive strength and significantly improved tensile strength, and its low porosity endows excellent waterproofness and chemical durability, effectively preventing steel corrosion, and the UHPC also exhibits excellent toughness, the UHPC can reduce the structural self-weight, it is suitable for prefabricated components, and can improve construction efficiency, the long service life and low maintenance requirement of the UHPC make it an extremely attractive choice in modern buildings.

[0047] Secondly, the stainless steel shell provides excellent corrosion resistance, effectively protecting the internal concrete and steel from external environmental influences, especially in humid, salt spray or chemically aggressive environments. This protection prolongs the service life of the structure and reduces maintenance requirements. Its high strength and toughness enhance the overall stability of the concrete structure, better able to withstand heavy loads and impact forces, suitable for bridges, high-rise buildings and other critical infrastructure.

[0048] In addition, the use of shaped steel can significantly enhance the structural performance. Shaped steel can improve the flexural and shear capacity of the beam, increase the overall stiffness, reduce deformation, enhance the structural stability and seismic performance. Shaped steel can also prevent premature cracking, improve durability, and protect the internal reinforcement from corrosion. The prefabricated nature of shaped steel can also speed up construction, reduce on-site work time, shorten project duration, and reasonably allocate shaped steel to reduce self-weight, improve structural efficiency, especially for high-rise buildings and bridge engineering.

[0049] By combining ultra-high performance concrete (UHPC) and stainless steel shell in the beam, the outstanding features of both are integrated. The stainless steel shell provides a first layer of physical barrier against corrosion and environmental damage, while the low porosity of UHPC further enhances durability and chemical resistance. This combination significantly improves the strength, toughness and seismic performance of the beam, and the prefabrication potential of this combination is high, with convenient construction, suitable for key structures such as bridges and high-rise buildings. BRIEF DESCRIPTION OF DRAWINGS

[0050] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of this specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation of the application.

[0051] Figure 1 The overall schematic diagram of the prefabricated assembly steel-concrete composite beam and installation method of the embodiment of the application.

[0052] Figure 2 The schematic diagram of the normal section of the prefabricated assembly steel-concrete composite beam and installation method of the embodiment of the application.

[0053] Figure 3 The schematic diagram of the U-shaped stainless steel pipe with PBL plate of the prefabricated assembly steel-concrete composite beam and installation method.

[0054] Figure 4 The schematic diagram of the reinforcement cage of the prefabricated assembly steel-concrete composite beam and installation method.

[0055] Figure 5 The structural schematic diagram of the support system and support of the embodiment of the application.

[0056] Figure 6 The A partial enlarged view of Figure 5

[0057] Figure 7 The structural schematic diagram of the support of the embodiment of the application.

[0058] Among them, the reference signs are: 1, U-shaped stainless steel pipe; 2, PBL plate; 3, shaped steel; 4, U-shaped shell; 5, reinforcement cage; 6, ordinary concrete;

[0059] ​21, bottom plate; 22, support rod one; 23, L-shaped support plate; 24, moving vertical plate; 25, sliding groove; 26, sliding block; 27, fixed plate;

[0060] 31, base; 32, support rod two; 33, support rod three; 34, connecting plate; 35, I-shaped steel support plate; 36, longitudinal steel reinforcement limiting ring. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0062] Embodiment 1

[0063] Please refer to Figures 1 to 4 , the present embodiment provides a prefabricated assembly steel concrete composite beam and a mounting method. The design and construction mode will be described in detail. The composite beam comprises a U-shaped stainless steel pipe 1, a PBL plate 2, an I-shaped steel 3, a U-shaped shell 4, a steel reinforcement cage 5 and ordinary concrete 6.

[0064] In combination Figure 1 , Figure 2 and Figure 3 , the U-shaped stainless steel pipe 1 is wrapped outside the U-shaped shell 4, which protects the ultra-high performance concrete from external environmental erosion. The inner surface of the U-shaped stainless steel pipe 1 is uniformly arranged with the PBL plate 2. The PBL plate 2 is distributed along the length direction of the U-shaped stainless steel pipe 1 at uniform intervals and is fixed on the U-shaped stainless steel pipe 1 by welding. The PBL plate 2 is designed in the form of a round hole steel plate. On the one hand, the PBL plate 2 can effectively transfer shear force. On the other hand, it can improve the connection quality between the U-shaped stainless steel pipe 1 and the concrete, delay the buckling of the U-shaped stainless steel pipe 1 and improve the overall performance of the structure.

[0065] In combination Figure 1 and Figure 2 , the use of the I-shaped steel 3 can improve the bending and shearing capacity of the beam, increase the overall stiffness, reduce the deformation, improve the structural stability and seismic performance, prevent the premature appearance of cracks, improve the durability, and protect the internal steel reinforcement from corrosion.

[0066] In combination Figure 1 and Figure 2 , the U-shaped shell 4 is the core structure of the composite beam. It is made of ultra-high performance concrete, which has the advantages of high strength, high toughness, good durability and difficulty in developing cracks. When applied to flexural members, it can effectively improve the crack resistance and deformation performance.

[0067] In combination Figure 4 , the steel cage 5 can ensure the integrity of the concrete and the construction quality, optimize material use, simplify the construction process, and speed up the progress. At the same time, the steel cage 5 enhances the load-carrying capacity and ductility of the structure, effectively disperses the load and prevents local stress concentration by providing high-strength tensile support. The steel and concrete work together to improve the 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 capacity and local bearing capacity of these areas can be effectively enhanced.

[0068] To better achieve the above-mentioned purposes of the application, the embodiment further provides an installation method based on prefabricated assembled 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, appropriate fixing measures are taken;

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

[0072] S2: Set up lateral formworks on both sides of the high-performance formwork, which maintain the shape of the concrete during pouring and provide support; the installation of the lateral formworks must be firm and reliable to prevent leakage during pouring;

[0073] S3: Pour ordinary concrete 6 to fill the inside of the high-performance formwork, and pay attention to vibration and compaction to exclude air bubbles in the concrete, so that the final formed composite beam has excellent overall integrity and mechanical properties. After curing is completed, remove the lateral formworks, and the installation of the composite beam is completed.

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

[0075] 1) Uniformly arrange PBL plates 2 inside U-shaped stainless steel pipes 1; in order to ensure the stable connection between the PBL plates 2 and the U-shaped stainless steel pipes 1, high-quality welding technology must be used to make the PBL plates 2 firmly adhere to the inner wall of the U-shaped stainless steel pipes 1;

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

[0077] 3) Place the U-shaped stainless steel pipe 1 with the welded PBL plate 2 on a pre-laid support system; the support system should be arranged in consideration of the load and deformation that may be generated in the subsequent process, so as to provide sufficient rigidity and stability;

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

[0079] 5) Install longitudinal reinforcement around the I-shaped steel 3 located in the U-shaped stainless steel pipe 1 according to the predetermined position, and bind it with ring-shaped stirrups at the designed interval to form a complete reinforcement cage;

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

[0081] Pour the ultra-high performance concrete, after one-time pouring and forming, remove the inner mold and lateral formwork when it reaches a certain strength, to form the U-shaped outer shell 4, and complete the prefabrication of the high-performance formwork.

[0082] Example 2

[0083] On the basis of example 1, the support system comprises a bottom plate 21, a support rod one 22, an L-shaped support plate 23, and a moving vertical plate 24; see Figure 5 、 Figure 6 ;

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

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

[0086] One end of the upper surface of the horizontal plate is provided with a sliding groove 25, the bottom of the moving vertical plate 24 abuts against the upper surface of the horizontal plate, and the bottom of the moving vertical plate 24 is further provided with a sliding block 26 which is slidingly matched with the sliding groove 25;

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

[0088] The horizontal fixing plate 27 is arranged at the bottom of the side wall of the moving vertical plate 24 away from the vertical plate, a plurality of evenly distributed threaded holes are arranged on the upper surface of the transverse plate on both sides of the sliding groove 25, a plurality of matching threaded holes are arranged on the fixing plate 27, the threaded holes on the upper surface of the transverse plate and the threaded holes on the fixing plate 27 are fixedly connected through bolts, the fixing of the moving vertical plate 24 is realized, and the U-shaped stainless steel pipe 1 is clamped between the vertical plate of the L-shaped supporting plate 23 and the moving vertical plate 24.

[0089] In the embodiment 2, the adjustable supporting system is arranged, the U-shaped stainless steel pipe is stably supported, the stability in the prefabrication process is ensured, and deformation is prevented. Meanwhile, adjustment and fixation according to the size of the U-shaped stainless steel pipe are facilitated, the prefabrication precision is improved, and a foundation is laid for subsequent processes.

[0090] The supporting system composed of the bottom plate, the supporting rod one, the L-shaped supporting plate, the moving vertical plate and the like is arranged, stable support is provided for the U-shaped stainless steel pipe. The supporting rod one of the electric telescopic rod can adjust the height according to actual needs, the supporting system can adapt to U-shaped stainless steel pipes of different sizes and weights, the stability in the prefabrication process is ensured, and structural damage caused by load or deformation is prevented.

[0091] The sliding groove on the transverse plate matches the sliding block at the bottom of the moving vertical plate, the moving vertical plate can slide along the sliding groove, position adjustment according to the width of the U-shaped stainless steel pipe is facilitated. The fixing plate is connected with the transverse plate through bolts, the moving vertical plate is fixedly connected, the U-shaped stainless steel pipe is tightly clamped between the vertical plate of the L-shaped supporting plate and the moving vertical plate, and the stability of the support is further improved, thereby providing a solid foundation for subsequent processes such as the hoisting of the I-shaped steel and the installation of the steel reinforcement cage.

[0092] The supporting system can accurately position and fix the U-shaped stainless steel pipe, and helps to improve the precision of the prefabricated high-performance formwork. When the U-shaped outer shell is formed by pouring the ultra-high performance concrete, the stable support can prevent the U-shaped stainless steel pipe from being displaced or deformed, so as to ensure that the shape and size of the U-shaped outer shell meet the design requirements, and improve the quality and performance of the entire prefabricated assembly steel reinforced concrete composite beam.

[0093] Embodiment 3

[0094] On the basis of the embodiment 2, the support is arranged on both sides of the supporting system;

[0095] The support includes a base 31, a supporting rod two 32, a supporting rod three 33, a connecting plate 34, an I-shaped steel supporting plate 35, and a longitudinal steel reinforcement limiting ring 36. See Figure 7 ;

[0096] The supporting rod two 32 and the supporting rod three 33 are both arranged as electric telescopic rods;

[0097] The fixed end of the support rod two 32 is fixedly arranged on the upper surface of the base 31, and the telescopic end of the support rod two 32 is fixedly connected with the fixed end of the support rod three 33;

[0098] The telescopic end of the support rod three 33 is fixedly connected with the connecting plate 34, and the I-shaped steel support plate 35 is arranged on one side of the connecting plate 34, and the I-shaped steel support plate 35 comprises two L-shaped plates which are matched with the inner side of the I-shaped steel 3 respectively;

[0099] The longitudinal steel limiting rings 36 are arranged at the four corners of the connecting plate 34 and matched with the longitudinal steel.

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

[0101] The support is arranged on both sides of the support system, and provides additional support for the I-shaped steel through the structure composed of the base, the support rod two, the support rod three, the connecting plate and the like. The support rod two and the support rod three of the electric telescopic rod can adjust the height, so that the I-shaped steel support plate can be closely matched with the inner side of the I-shaped steel, effectively preventing the I-shaped steel from shaking and shifting during hoisting and prefabrication, ensuring that it is stably located at the predetermined position, and improving the assembly accuracy and overall stability of the structure.

[0102] The longitudinal steel limiting rings arranged at the four corners of the connecting plate are matched with the longitudinal steel, and can accurately position and limit the longitudinal steel. When installing the steel reinforcement cage, the limiting ring can ensure that the longitudinal steel is arranged according to the designed spacing and position, avoiding the deviation or distortion of the steel, thereby ensuring the overall quality and performance of the steel reinforcement cage, making it better work with the concrete, enhancing the load-bearing capacity and seismic performance of the composite beam.

[0103] The design of the support simplifies the installation process of the I-shaped steel and the steel reinforcement cage, reduces the workload of manual adjustment and calibration, and improves the construction efficiency. At the same time, the accurate positioning and stable support help to reduce the construction error, improve the construction quality of the prefabricated assembly steel reinforced concrete composite beam, and ensure that it meets the high-standard building requirements, providing reliable protection for subsequent on-site installation and use.

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

Claims

1. A precast assembled steel-concrete composite beam, characterized in that: The high-performance mold shell includes a U-shaped shell (4), a U-shaped stainless steel tube (1) wrapped around the U-shaped shell (4), a number of PBL plates (2) set inside the U-shaped stainless steel tube (1), an I-beam (3) set inside the U-shaped shell (4), and a steel cage (5) set inside the U-shaped shell (4). The U-shaped outer shell (4) is made of UHPC ultra-high performance concrete; The U-shaped shell (4) is filled with ordinary concrete (6); The outer surface of the U-shaped shell (4) is wrapped with a U-shaped stainless steel tube (1), the U-shaped 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). The PBL plate (2) is evenly arranged along the inside of the U-shaped stainless steel tube (1) and welded inside the U-shaped stainless steel tube (1); The U-shaped outer shell (4) is U-shaped; The U-shaped stainless steel tube (1) is configured as U-shaped. The U-shaped stainless steel tube (1) includes a base plate and side plates disposed at both ends of the upper surface of the base plate. The PBL plate (2) is disposed on the opposite side walls of the base plate and the two side plates. The reinforcing cage (5) is located outside the I-beam (3); The steel cage (5) consists of longitudinal steel bars and several annular stirrups distributed along the length of the longitudinal steel bars; The installation method for a precast assembled steel-concrete composite beam includes the following steps: S1: Transport the prefabricated high-performance mold shell to the construction site; To ensure the mold shell is not damaged during transportation, appropriate securing measures should be taken; Upon arrival at the construction site, the high-performance formwork was arranged according to the predetermined location and sequence, and a crane was used to accurately place the high-performance formwork into place. S2: Lateral formwork is set on both sides of the high-performance formwork. The lateral formwork maintains the shape of the concrete and provides support during the pouring process. S3: Pour ordinary concrete (6) to fill the interior of the high-performance formwork, remove air bubbles in the concrete, and remove the side formwork after curing to complete the installation of the composite beam; In step S1, a prefabricated high-performance mold shell is prepared in the factory. The specific steps are as follows: 1) Arrange the PBL plate (2) evenly inside the U-shaped stainless steel tube (1); 2) Prepare suitable I-beams (3) and longitudinal steel bars and ring stirrups for forming the steel cage (5) according to the size requirements on the design drawings; 3) Place the U-shaped stainless steel pipe (1) with PBL plate (2) welded on it on a pre-laid support system; the support system should be set up to take into account the loads and deformations that may occur in subsequent processes, so as to provide sufficient rigidity and stability; 4) Using hoisting equipment, the pre-prepared I-beam (3) is hoisted into the U-shaped stainless steel pipe (1) with PBL plate (2) welded on, hoisted to the designated position, and temporarily fixed by the bracket; 5) Install longitudinal steel bars around the I-beam (3) located inside the U-shaped stainless steel pipe (1) at predetermined positions, and tie them with ring stirrups at the designed intervals to form a complete steel cage; 6) Place a hollow inner formwork at the designated location inside the beam, and simultaneously set up lateral formwork on both sides of the beam; After pouring ultra-high performance concrete and forming it in one go, wait until it reaches a certain strength, remove the inner mold and side template to form a U-shaped shell (4), thus completing the prefabrication of the high performance shell. The support system includes a base plate (21), a support rod (22), an L-shaped support plate (23), and a movable vertical plate (24). The L-shaped support plate (23) includes a horizontal plate and a vertical plate disposed at one end of the upper surface of the horizontal plate; The first support rod (22) is configured as an electric telescopic rod. The fixed end of the first support rod (22) is fixedly set on the upper surface of the base plate (21), and the telescopic end of the first support rod (22) is fixedly connected to the lower surface of the horizontal plate. A 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), the slider (26) slidingly matching the groove (25); The U-shaped stainless steel pipe (1) is provided between the upright plate of the L-shaped support plate (23) and the movable vertical plate (24). A horizontal fixing plate (27) is provided at the bottom of the side wall away from the vertical plate of the movable vertical plate (24). Several evenly distributed threaded holes are provided on the upper surface of the horizontal plate on both sides of the slide groove (25). Several 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 tube (1) between the vertical plate of the L-shaped support plate (23) and the movable vertical plate (24). The brackets are arranged on both sides of the support system; 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). Both the second (32) and the third (33) support rods are configured as electric telescopic rods; The fixed end of the second support rod (32) is fixedly set 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 (33) is fixedly connected to the connecting plate (34). An I-beam support plate (35) is provided on one side of the connecting plate (34). The I-beam support plate (35) includes two L-shaped plates, which are respectively matched with the inner side of the I-beam (3). The longitudinal reinforcing bar limiting rings (36) are provided at the four corners of the connecting plate (34), and the longitudinal reinforcing bar limiting rings (36) are matched with the longitudinal reinforcing bars.

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