Superposed beam section reinforcement structure capable of efficiently penetrating reinforcements and construction method of superposed beam section reinforcement structure

Abstract

The invention discloses a superposed beam section reinforcement structure capable of efficiently penetrating reinforcements and a construction method thereof, which are characterized in that composite stirrup combinations with different limb numbers are adopted for a superposed beam with the section width of 400-800mm which is common in engineering, and the hook form and position of the stirrup are changed, so that efficient reinforcement penetrating is facilitated. Compared with the prior art, by optimizing the stirrup structure form of the section of the superposed beam, the problem that a 135-degree hook of a traditional stirrup collides with a longitudinal bar steel bar is solved, the operation space for the superposed beam to penetrate through a top bar later is increased, the construction difficulty is reduced, and the site construction efficiency of the superposed beam is effectively improved. According to the composite beam section reinforcement structure, the construction problem that reinforcement penetrating of an existing assembly type frame structure composite beam is difficult is solved, the quality problem caused by stirrup cutting on the site due to reinforcement penetrating difficulty can be avoided, the structural safety is guaranteed, meanwhile, the optimized composite stirrup structure of the composite beam is simple, production is convenient, and efficient machining and efficient construction can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building structures, relates to an assembled frame structure, and particularly relates to a composite beam cross-section reinforcement structure with high-efficiency reinforcement penetration and a construction method thereof. Background Art

[0002] Precast concrete composite beams are a type of structural member that is first prefabricated in part in a factory and then installed, reinforced, and poured with composite concrete layers at the construction site to form an integral whole. They have high installation efficiency and good coordination with floor slabs. They can be combined with large steel formwork cast-in-place concrete columns, precast concrete columns, steel tube concrete columns, etc. to form a frame structure and are widely used in prefabricated concrete structures.

[0003] The insertion of top reinforcement is a key step in the on-site construction of precast concrete composite beams. In the design and construction process of precast concrete composite beams of prefabricated concrete structures, when the beam section width exceeds 250mm, composite stirrups with 135° hooks are required. However, due to the dense arrangement of the bottom reinforcement of the beam, the 135° hooks of the composite stirrups are prone to collision with the steel bars. In the actual construction process, the hooks need to be set in the composite layer, which seriously affects the insertion operation space of the top reinforcement of the beam, greatly reducing the construction efficiency, or the top reinforcement cannot be inserted due to the collision between the top reinforcement of the beam and the steel bars of the hooks.

[0004] The existing technology proposes to solve the problem of steel bar conflict between the top reinforcement and the hook by using a 90° hook or a welded closed hoop, but the 90° hook has the problem of insufficient bonding strength and anchor failure after the protective layer is peeled off, while the quality of the welded closed hoop is unstable and the safety risk is high.

[0005] In addition, although the specification requires the maximum spacing of stirrups to be 200mm or 250mm, for composite beams with smaller cross-sectional widths (such as 400mm), considering the difficulty of tying 135° reinforcement and ensuring construction quality, the current project still chooses to use four-leg composite stirrups composed of two closed stirrup sleeves, and the stirrup spacing is small, which further increases the difficulty of inserting the top reinforcement. When the top reinforcement cannot be inserted due to the stirrup blocking the top reinforcement, the construction site may adopt the method of cutting the stirrups first, inserting the reinforcement and then welding and repairing it, which makes it difficult to ensure the welding quality of the stirrups, greatly increasing the safety hazards of the structure.

[0006] Therefore, it is urgent to develop a composite beam cross-section structure with efficient reinforcement penetration to solve the practical problems of collision between the hook and the longitudinal reinforcement and difficulty in inserting the top reinforcement, so as to improve construction efficiency and ensure structural safety. Summary of the invention

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a composite beam cross-section reinforcement structure with efficient reinforcement penetration and a construction method thereof, so as to solve the problems of difficulty in threading the top reinforcement of the existing composite beams, steel bar collision, low construction quality, high quality and safety risks, etc.

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

[0009] Highly efficient reinforced composite beam section construction, including composite stirrups, precast concrete layers and composite concrete layers, is suitable for composite beam sections with a section width range of 400-800mm.

[0010] When the cross-section width ranges from 400 to 500 mm, the composite stirrup is a three-legged stirrup formed by combining a double-legged closed stirrup sleeve and a tie bar, and the hook of the double-legged closed stirrup sleeve is bent twice and overlaps with the vertical section of the tie bar;

[0011] When the cross-section width ranges from 500 to 700 mm, it is structure 2, the composite stirrup is a four-legged stirrup consisting of a double-legged closed stirrup sleeve 1 and a double-legged closed stirrup sleeve 2, the hook 1 of the double-legged closed stirrup sleeve 1 is bent twice and overlaps with a vertical section of the double-legged closed stirrup sleeve 2, and the two hooks 5 of the double-legged closed stirrup sleeve 2 are bent twice and overlap with the two vertical sections of the double-legged closed stirrup sleeve 2 respectively;

[0012] When the cross-section width ranges from 700 to 800 mm, it is structure three, the composite stirrup is a five-leg stirrup consisting of a double-leg closed stirrup set one, a tension bar and a double-leg closed stirrup set three, the hook one of the double-leg closed stirrup set one is bent twice and overlaps with a vertical section of the double-leg closed stirrup set three, the hook six of the double-leg closed stirrup set three is bent twice and overlaps with a vertical section of the double-leg closed stirrup set three, and the hook seven is bent twice and overlaps with the vertical section of the tension bar;

[0013] In each structure, after the hook 2 of the double-leg closed stirrup sleeve 1 is bent, one of the bent sections overlaps with a vertical section of the double-leg closed stirrup sleeve 1.

[0014] In one embodiment, in the structure 1, the hook 3 of the tension bar near one end of the concrete of the superimposed layer is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve 1, and the hook 4 near one end of the concrete of the precast layer is a 180° hook, or is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve 1. Similarly, in the structure 3, the hook 3 of the tension bar near one end of the concrete of the superimposed layer is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve 3, and the hook 4 near one end of the concrete of the precast layer is a 180° hook, or is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve 3.

[0015] In one embodiment, in the structure one and the structure three, the hook three of the reinforcement is located in the concrete of the superimposed layer, or in the concrete of the superimposed layer and part of the precast layer concrete; the hook four is located in the concrete of the precast layer.

[0016] In one embodiment, the length of the last bending section of hook one, hook two, hook three, hook four, hook five, hook six and hook seven is not less than 8 times the diameter of the corresponding stirrup or tension bar.

[0017] In one embodiment, in the structure two, the two hooks five of the double-leg closed stirrup sleeve two are both located in the precast concrete layer; in the structure three, the hooks six and seven of the double-leg closed stirrup sleeve three are both located in the precast concrete layer to reduce the influence of the hooks on the penetration of the top reinforcement.

[0018] In one embodiment, in each structure, the hook 2 of the double-limb closed stirrup sleeve is located in the concrete of the overlapping layer, or in the concrete of the overlapping layer and part of the precast layer concrete; the hook 2 of the double-limb closed stirrup sleeve is bent once and is located in the concrete of the overlapping layer, or in the concrete of the overlapping layer and part of the precast layer concrete, or is bent twice and anchored in the precast layer concrete.

[0019] In one embodiment, the high-efficiency reinforced composite beam cross-section structure also includes top reinforcement, waist reinforcement and bottom reinforcement. The top reinforcement adopts high-strength steel bars with a tensile strength of more than 500 MPa to reduce the number of top reinforcement, or adopts ordinary steel bars; the composite stirrups adopt high-strength steel bars with a tensile strength of more than 500 MPa to reduce the diameter of the composite stirrups, or adopts ordinary steel bars, and the bottom reinforcement and waist reinforcement are ordinary steel bars or prestressed steel strands.

[0020] In one embodiment, when the flange of the composite beam is not provided with a flange floor, the hook 2 of the double-leg closed stirrup sleeve 1 needs to be bent twice, and the bending angle of the last bent section is 90° or 45°. The last bent section is completely anchored in the precast layer concrete, and there is no steel bar conflict with the waist reinforcement.

[0021] In one embodiment, a high-efficiency reinforced composite beam having the high-efficiency reinforced composite beam cross-section structure is combined with various frame columns to form a beam-column node and a frame structure, such as a steel tube concrete column, a precast concrete column, a cast-in-place concrete column, a steel concrete column, etc.

[0022] The present invention also provides a construction method for the high-efficiency reinforced composite beam, comprising the following steps:

[0023] Step 1, tying and fixing the stirrup sleeves and the tension bars of each component of the composite stirrup to form a whole, and fixing all the composite stirrups of the composite beam on the mold bottom plate of the composite beam;

[0024] Step 2: insert the bottom reinforcement and waist reinforcement of the composite beam, move the composite stirrups to the corresponding position according to the design requirements, and tie the steel cage;

[0025] Step 3, setting up the side form of the composite beam and pouring the precast layer concrete;

[0026] Step 4: After the composite beam is installed in place, the top reinforcement is installed and then the composite layer concrete is poured.

[0027] In one embodiment, when the bottom reinforcement and waist reinforcement are prestressed steel strands using the pre-tensioning method, the steel strands are tensioned first in step 2, and then the composite stirrups are moved and the steel cage is tied.

[0028] Compared with the prior art, the present invention increases the operating space for inserting top reinforcement while ensuring the cross-sectional bearing capacity through the optimized configuration of composite stirrups, reduces the construction difficulty, and eliminates the quality and safety hazards caused by cutting stirrups due to the inability to insert top reinforcement at the construction site.

[0029] The present invention can also use high-strength steel bars as top bars, further reducing the number of top bars that need to be installed on site and improving construction efficiency.

[0030] The node component of the present invention is simple, the force transmission path is clear, and the construction is convenient, which solves the application pain points of the existing concrete modular semi-rigid connection nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a plan view schematically showing a cross-section structure of a composite beam according to the present invention.

[0032] Figure 2 A schematic plan view of another method for constructing a composite beam cross section according to the present invention.

[0033] Figure 3 It is a plan view schematically showing the second cross-section structure of the composite beam of the present invention.

[0034] Figure 4 It is a plan view schematically showing the cross-section structure three of the composite beam of the present invention.

[0035] Figure 5 It is a schematic plan view of a composite beam cross section of the present invention in which a flange floor is provided on only one side.

[0036] Figure 6 It is a schematic plan view of a composite beam cross section of the present invention in which flange slabs are not arranged on both sides.

[0037] In the figure:

[0038] 1-composite beam section; 11-composite stirrups; 12-top reinforcement; 13-waist reinforcement; 14-bottom reinforcement; 15-precast layer concrete; 16-composite layer concrete; 17-flange slab; 2-double-leg closed stirrup set one; 21-hook one; 22-hook two; 3-tension reinforcement; 31-hook three; 32-hook four; 4-double-leg closed stirrup set two; 41-hook five; 5-double-leg closed stirrup set three; 51-hook six; 52-hook seven. DETAILED DESCRIPTION

[0039] The specific technical solutions of the present invention are described below in conjunction with embodiments.

[0040] The high-efficiency reinforced composite beam cross-section structure of the present invention aims to solve the problem of collision between the 135° bend hook of the traditional stirrup and the longitudinal reinforcement by optimizing the stirrup structure of the composite beam cross-section, thereby increasing the operating space for the rear reinforcement of the composite beam, reducing the construction difficulty, and effectively improving the on-site construction efficiency of the composite beam. It is suitable for composite beam cross-sections with a cross-sectional width range of 400-800mm 1.

[0041] refer to Figure 1 As shown, when the cross-sectional width range is 400-500mm, for construction 1, a three-leg composite stirrup 11 is formed by combining a double-leg closed stirrup sleeve 2 and a tie bar 3. Among them, the hook 21 of the double-leg closed stirrup sleeve 2 is bent twice to overlap with the vertical section of the tie bar 3, and the last bent section is a 90° hook, which avoids the problem of collision between the traditional 135° hook and the longitudinal bar, and minimizes the influence of the hook 21 on the space for the top bar 12 to pass through. At the same time, by bending twice, the end of the hook 21 is anchored into the core area of ​​the concrete to prevent the stirrup anchorage failure caused by the shedding of the protective layer; after the hook 22 of the double-leg closed stirrup sleeve 2 is bent, one of the bent sections overlaps with a vertical section of the double-leg closed stirrup sleeve 2. As shown in the figure, although the anchoring position of the hook 22 is located at the edge area of ​​the composite beam section, due to the existence of the flange floor, it is still anchored to the core from the overall point of view. In the core concrete, there is no risk of anchor failure after the protective layer is peeled off. The anchor requirement can be met by bending once with a 90° hook, which saves the steel consumption of the stirrups. Different from the traditional tie bars with 135° hooks at both ends, the hook three 31 at the end of the tie bar 3 close to the composite layer concrete 16 is bent twice and overlapped with a vertical section of the double-leg closed stirrup sleeve 2, avoiding collision with the top reinforcement and facilitating binding. The hook four 32 near the end of the precast layer concrete 15 adopts a 180° hook to ensure anchoring in the core area of ​​the concrete while avoiding the bottom reinforcement as much as possible. When the problem of steel bar conflict still exists after using the 180° hook, it can be bent twice and overlapped with a vertical section of the double-leg closed stirrup sleeve 2, such as Figure 2 shown.

[0042] refer to Figure 3As shown, when the cross-sectional width ranges from 500 to 700 mm, it is structure 2, which uses a four-limb composite stirrup 11 composed of a double-limb closed stirrup sleeve 12 and a double-limb closed stirrup sleeve 24. Among them, the hook 121 of the double-limb closed stirrup sleeve 2 is bent twice and overlaps with a vertical section of the double-limb closed stirrup sleeve 24, while ensuring that the hook 121 is anchored into the core concrete and reducing the impact on the penetration of the top reinforcement, the length of the first bending section is shortened, the amount of steel used is reduced, and the cost is reduced. After the hook 22 of the double-limb closed stirrup sleeve 2 is bent, one of the bending sections overlaps with a vertical section of the double-limb closed stirrup sleeve 2, as shown in the figure. The two hooks 541 of the double-limb closed stirrup sleeve 24 are bent twice and overlap with the two vertical sections of the double-limb closed stirrup sleeve 24 respectively.

[0043] refer to Figure 4 As shown, when the cross-sectional width range is 700-800mm, it is structure three, which adopts a five-limb composite stirrup 11 composed of a double-limb closed stirrup sleeve 2, a tension bar 3 and a double-limb closed stirrup sleeve 5. The hook 1 21 of the double-limb closed stirrup sleeve 2 is bent twice and overlaps with a vertical segment of the double-limb closed stirrup sleeve 5. After the hook 2 22 of the double-limb closed stirrup sleeve 2 is bent, one of the bent segments overlaps with a vertical segment of the double-limb closed stirrup sleeve 2, as shown in the figure. The hook six 51 of the double-leg closed stirrup sleeve three 5 is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve three 5, and the hook seven 52 is bent twice and overlaps with the vertical section of the tension bar 3; similarly, the hook three 31 of the tension bar 3 near the end of the composite layer concrete 16 is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve three 5, and the hook four 32 near the end of the precast layer concrete 15 adopts a 180° hook, or is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve three 5.

[0044] In this structure, for the composite beam section 1, when the section width is 500 mm, structure 1 or structure 2 can be selected, preferably structure 2, and when the section width is 700 mm, structure 2 or structure 3 can be selected, preferably structure 3.

[0045] In this structure, for each structure, according to the different diameters of the stirrups, in order to meet the requirements of the hook anchoring length, the hook 21 of the double-limb closed stirrup sleeve 2 is located in the overlapping layer concrete 16, or in the overlapping layer concrete 16 and part of the precast layer concrete 15; the hook 22 of the double-limb closed stirrup sleeve 2 is bent once and is located in the overlapping layer concrete 16, or in the overlapping layer concrete 16 and part of the precast layer concrete 15, or is bent twice and anchored in the precast layer concrete 15.

[0046] In this structure, for the structure one and the structure three, according to the different diameters of the reinforcement, in order to meet the requirements of the hook anchoring length, the hook three 31 of the reinforcement 3 is located in the composite layer concrete 16, or in the composite layer concrete 16 and part of the precast layer concrete 15; the hook four 32 is located in the precast layer concrete 15.

[0047] In this structure, the second structure, by setting the two hooks 5 41 of the double-limb closed stirrup sleeve 2 4 in the precast layer concrete 15 at the bottom of the cross-section, can further reduce the influence of the hook 5 41 on the insertion of the top reinforcement 12, avoid excessive overlap of the hooks at the same position, when the process is limited, the hook 5 41 can also be set at the top of the cross-section; the third structure, similarly, in order to increase the insertion space of the top reinforcement 12, the hook 6 51 and the hook 7 52 of the double-limb closed stirrup sleeve 3 5 are both set in the precast layer concrete 15, when the process is limited, the hook 6 51 and the hook 7 52 can also be set at the top of the cross-section.

[0048] In this structure, the length of the last bending section of the hook 1 21, hook 22, hook 3 31, hook 4 32, hook 5 41, hook 6 51 and hook 7 52 is not less than 8 times the diameter of the corresponding stirrup or reinforcement 3 to ensure the anchoring performance and prevent structural damage due to anchoring failure.

[0049] In this structure, the cross-section structure of the high-efficiency reinforced composite beam also includes top reinforcement 12, waist reinforcement 13 and bottom reinforcement 14. The top reinforcement 12 uses high-strength steel bars with a tensile strength of more than 500MPa to reduce the number of top reinforcement 12, or uses ordinary steel bars; the composite stirrups 11 use high-strength steel bars with a tensile strength of more than 500MPa to reduce the diameter of the composite stirrups 11, or use ordinary steel bars, and the bottom reinforcement 14 and waist reinforcement 15 are ordinary steel bars or pre-tensioned prestressed steel strands. Through the reasonable application of high-strength steel bars, the reinforcement amount of the cross section can be further reduced and its construction performance can be improved.

[0050] In some embodiments of the present invention, there may be a situation where the flange slab 17 exists on only one side of the composite beam or on both sides. When there is no protection of the flange slab 17, the hook 3 22 of the double-leg closed stirrup sleeve 2 is located at the edge of the section, and when the protective layer cracks or peels off, it is easy to cause structural safety problems. Figure 5 In the case where the flange slab 17 exists on only one side of the composite beam shown, the hook 22 should be arranged on the side close to the flange slab 17; Figure 6 In the case where there is no flange slab 17 on both sides of the composite beam shown, the hook 3 22 should be bent twice, and the bending angle of the last bending section is 90° or 45°. The last bending section is completely anchored in the precast layer concrete 15 and does not conflict with the waist reinforcement 13.

[0051] In some embodiments of the present invention, an efficient through-reinforced composite beam having the cross-section structure of the efficient through-reinforced composite beam is combined with various frame columns to form a beam-column node and a frame structure, such as a steel tube concrete column, a precast concrete column, a cast-in-place concrete column, a steel-concrete column, etc.

[0052] The present invention further provides a construction method for a high-efficiency reinforced composite beam cross-section structure, which improves construction efficiency based on an optimized cross-section structure. Specifically, the construction method comprises the following steps:

[0053] Step 1: Prepare the steel bar material and mold base.

[0054] Ensure that all stirrup and tie materials meet the design requirements, including specifications, quantity and strength grade. The surfaces of stirrups and tie bars should be clean and free from rust and contamination to ensure a good connection. Prepare the mold base for fixing composite stirrups to ensure its flatness and stability.

[0055] The stirrup sleeves of each component of the composite stirrup 11 are tied with the tie bars 3 to form a whole, and all the composite stirrups 11 of the composite beam are fixed to the mold bottom plate of the composite beam to ensure accurate position and avoid displacement during the subsequent pouring process. The quality of the tying in this step directly affects the structural performance.

[0056] Step 2: Install bottom reinforcement and waist reinforcement, and tie up the steel cage.

[0057] The bottom reinforcement 14 and waist reinforcement 13 of the composite beam are installed in place, and then the composite stirrups 11 are moved to the corresponding position according to the design requirements to ensure that the stirrups match the positions of the bottom reinforcement and waist reinforcement, and the bottom reinforcement 14, waist reinforcement 13 and composite stirrups 11 are tied to form a complete steel cage. The installation of the bottom reinforcement 14 and waist reinforcement 13 in this step is a key process to ensure the strength and stability of the composite beam structure. Through reasonable spacing and position arrangement, the bearing capacity of the structure can be improved.

[0058] Step 3: support the side form of the composite beam and pour the precast layer concrete 15.

[0059] The side forms are supported on both sides of the steel cage to ensure its verticality and stability. A support system can be used to fix the side forms to prevent them from shifting or deforming during the pouring process. Subsequently, the concrete is poured evenly in the mold to ensure the density and uniformity of the concrete. The concrete is vibrated with a vibrator to remove air bubbles and improve the density and strength of the concrete. After pouring, the concrete is properly cured to keep it moist to prevent cracking and insufficient strength.

[0060] Step 4: After the composite beam is installed in place, the top reinforcement 12 is installed, and then the composite layer concrete 16 is poured.

[0061] In some embodiments of the present invention, when the bottom reinforcement 14 and the waist reinforcement 13 are prestressed steel strands using the pre-tensioning method, in order to avoid interfering with the tensioning of the steel strands, the steel strands are tensioned first in step 2, and then the composite stirrups 11 and the tied steel cage are moved.

[0062] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-efficiency reinforced composite beam cross-section structure, comprising composite stirrups (11), precast concrete layers (15) and composite concrete layers (16), suitable for composite beam cross-sections (1) with a cross-section width ranging from 400 to 800 mm, characterized in that: When the cross-sectional width ranges from 400 to 500 mm, the composite stirrup (11) is a three-legged stirrup formed by combining a double-legged closed stirrup sleeve (2) and a tie bar (3), and the hook (21) of the double-legged closed stirrup sleeve (2) is bent twice and then overlaps with the vertical section of the tie bar (3); When the cross-sectional width ranges from 500 to 700 mm, the second structure is adopted, the composite stirrup (11) is a four-legged stirrup consisting of a double-legged closed stirrup sleeve (2) and a double-legged closed stirrup sleeve (4), the hook (21) of the double-legged closed stirrup sleeve (2) is bent twice and then overlaps with a vertical section of the double-legged closed stirrup sleeve (4), and the two hooks (41) of the double-legged closed stirrup sleeve (4) are bent twice and then overlap with two vertical sections of the double-legged closed stirrup sleeve (4) respectively; When the cross-sectional width ranges from 700 to 800 mm, it is structure three, the composite stirrup (11) is a five-leg stirrup consisting of a double-leg closed stirrup sleeve (2), a tension bar (3) and a double-leg closed stirrup sleeve (5), the hook one (21) of the double-leg closed stirrup sleeve (2) is bent twice and then overlaps with a vertical section of the double-leg closed stirrup sleeve (5), the hook six (51) of the double-leg closed stirrup sleeve (5) is bent twice and then overlaps with a vertical section of the double-leg closed stirrup sleeve (5), and the hook seven (52) is bent twice and then overlaps with the vertical section of the tension bar (3); In each structure, after the hook 2 (22) of the double-leg closed stirrup sleeve 1 (2) is bent, one of the bent sections overlaps with a vertical section of the double-leg closed stirrup sleeve 1 (2).

2. The high-efficiency reinforced composite beam cross-section structure according to claim 1 is characterized in that: In the structure 1, the hook 3 (31) of the tie bar (3) near one end of the laminated layer concrete (16) is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve (2), and the hook 4 (32) near one end of the precast layer concrete (15) is a 180° hook, or is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve (2); In the third structure, the hook three (31) of the tie bar (3) near one end of the composite layer concrete (16) is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve three (5), and the hook four (32) near one end of the precast layer concrete (15) is a 180° hook, or is bent twice and overlaps with a vertical section of the double-leg closed stirrup sleeve three (5).

3. The high-efficiency reinforced composite beam cross-section structure according to claim 2 is characterized in that: In the structure one and the structure three, the hook three (31) of the tie bar (3) is located in the composite layer concrete (16), or in the composite layer concrete (16) and part of the precast layer concrete (15); the hook four (32) is located in the precast layer concrete (15).

4. The high-efficiency reinforced composite beam cross-section structure according to claim 2 is characterized in that: The length of the last bending section of the hook one (21), hook two (22), hook three (31), hook four (32), hook five (41), hook six (51) and hook seven (52) is not less than 8 times the diameter of the corresponding stirrup or tie rod (3).

5. The high-efficiency reinforced composite beam cross-section structure according to claim 1 is characterized in that: In the second structure, the two hooks 5 (41) of the second double-leg closed stirrup sleeve (4) are both located in the precast concrete layer (15); in the third structure, the hooks 6 (51) and 7 (52) of the third double-leg closed stirrup sleeve (5) are both located in the precast concrete layer (15) to reduce the influence of the hooks on the penetration of the top reinforcement (12).

6. The high-efficiency reinforced composite beam cross-section structure according to claim 1 is characterized in that: In each structure, the second hook (21) of the double-leg closed stirrup sleeve (2) is located in the laminated layer concrete (16), or in the laminated layer concrete (16) and part of the precast layer concrete (15); the second hook (22) of the double-leg closed stirrup sleeve (2) is bent once and located in the laminated layer concrete (16), or in the laminated layer concrete (16) and part of the precast layer concrete (15), or is bent twice and anchored in the precast layer concrete (15).

7. The high-efficiency reinforced composite beam cross-section structure according to any one of claims 1 to 6, characterized in that: The high-efficiency reinforced composite beam cross-section structure also includes top reinforcement (12), waist reinforcement (13) and bottom reinforcement (14), wherein the top reinforcement (12) uses high-strength steel bars with a tensile strength of more than 500 MPa to reduce the number of top reinforcements (12), or uses ordinary steel bars; the composite stirrups (11) use high-strength steel bars with a tensile strength of more than 500 MPa to reduce the diameter of the composite stirrups (11), or use ordinary steel bars, and the bottom reinforcement (14) and waist reinforcement (15) are ordinary steel bars or prestressed steel strands.

8. The high-efficiency reinforced composite beam cross-section structure according to claim 7 is characterized in that: When the flange of the composite beam is not provided with a flange floor (17), the hook 2 (22) of the double-leg closed stirrup sleeve 1 (2) is bent twice, the bending angle of the last bent section is 90° or 45°, and the last bent section is completely anchored in the precast layer concrete (15) and does not conflict with the waist reinforcement (13).

9. The high-efficiency reinforced composite beam cross-section structure according to claim 1, characterized in that: The high-efficiency through-reinforced composite beams using the high-efficiency through-reinforced composite beam cross-section structure are combined with various frame columns to form beam-column nodes and frame structures.

10. The construction method of the high-efficiency reinforced composite beam according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, tying and fixing the stirrup sleeves of each component of the composite stirrup (11) and the tie bars (3) to form a whole, and fixing all the composite stirrups (11) of the composite beam on the mold bottom plate of the composite beam; Step 2, inserting the bottom reinforcement (14) and waist reinforcement (13) of the composite beam, moving the composite stirrup (11) to the corresponding position according to the design requirements, and tying the steel cage; wherein, when the bottom reinforcement (14) and waist reinforcement (13) adopt pre-tensioned prestressed steel strands, the steel strands are tensioned first, and then the composite stirrup (11) is moved and the steel cage is tied; Step 3, supporting the side form of the composite beam and pouring the precast layer concrete (15); Step 4: After the composite beam is installed in place, the top reinforcement (12) is installed, and then the composite layer concrete (16) is poured.

Images