Connecting structure of prefabricated primary beam and prefabricated secondary beam

Abstract

The utility model provides a prefabricated primary and secondary beam connecting structure which comprises a prefabricated primary beam, a prefabricated secondary beam and a laminated layer, a primary beam notch is formed in the position, corresponding to the prefabricated secondary beam, of the upper portion of the prefabricated primary beam, and a secondary beam notch is formed in the position, corresponding to the prefabricated primary beam, of the lower portion of the prefabricated secondary beam. The two sides of the position, corresponding to the prefabricated main beam, of the upper portion of the prefabricated secondary beam are each inwards provided with a groove, concrete is poured on the upper portions of the prefabricated main beam and the prefabricated secondary beam by a certain thickness and in the grooves of the prefabricated secondary beam, and the laminated layer is formed. As the prefabricated secondary beam does not need to be disconnected at the connecting part, the primary beam and the secondary beam are connected by overlapping the secondary beam notch with the primary beam notch, so that the problem of difficulty in anchoring due to dense steel bars at the connecting node of the prefabricated primary beam and the secondary beam is avoided, the steel bars do not need to be reserved in the primary beam notch and the secondary beam notch, and the construction quality of a post-cast layer is easily ensured; and the shear resistance of the connecting structure of the prefabricated primary and secondary beams is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of assembly integral type concrete structure engineering, and particularly relates to a connecting structure of prefabricated main beam and secondary beam. BACKGROUND

[0002] At present, with the increasing attention of the country to the "four energy saving and environmental protection", the assembly type building in line with the green environmental protection concept has developed, the assembly integral type structure is widely applied due to the fast construction speed and good integrity, the assembly integral type concrete structure is the assembly type concrete structure formed by connecting the prefabricated concrete component through reliable mode and the in-situ post-poured concrete and cement-based grouting material. The connection between the prefabricated secondary beam and the main beam is usually that a groove is opened on the prefabricated main beam, the lower part of the prefabricated secondary beam is reserved with a certain length of longitudinal reinforcement during the component manufacturing, the prefabricated secondary beam is placed at the groove of the prefabricated main beam during construction, the reserved inserted reinforcement is anchored into the groove, and the connection between the prefabricated main beam and the secondary beam is realized through the post-poured concrete.

[0003] However, the application of the assembly type concrete structure in large-scale engineering is more and more common, the prefabricated main beam is high, the prefabricated secondary beam distributes the load, and the beam height is also high, so a large groove is opened on the prefabricated main beam, the groove opening part of the prefabricated main beam is greatly weakened, which is not conducive to the shear performance of the prefabricated main beam and is also not conducive to the transportation and hoisting of the prefabricated main beam. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a connecting structure of prefabricated main beam and secondary beam, grooves, i.e. a main beam groove and a secondary beam groove, are respectively opened on the prefabricated main beam and the secondary beam, the connection is realized through the grooves, the main beam groove and the secondary beam groove are small, the height weakening of the prefabricated main beam is small, which is conducive to the shear performance of the prefabricated main beam, and the construction difficulty of the joint part is also reduced.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A connecting structure of prefabricated main beam and secondary beam, including prefabricated main beam, prefabricated secondary beam and composite layer, a main beam groove is opened on the upper part of the prefabricated main beam at the position corresponding to the prefabricated secondary beam, a secondary beam groove is opened on the lower part of the prefabricated secondary beam at the position corresponding to the prefabricated main beam, two recesses are respectively opened on the two sides of the upper part of the prefabricated secondary beam corresponding to the prefabricated main beam, the secondary beam groove of the prefabricated secondary beam is arranged on the main beam groove of the prefabricated main beam, a cross type structure is formed, the upper surface of the prefabricated main beam is flush with the upper surface of the prefabricated secondary beam, the prefabricated main beam and the prefabricated secondary beam are respectively provided with upward protruding upper extension reinforcement, the prefabricated main beam and the prefabricated secondary beam are poured with concrete in a certain thickness above the prefabricated main beam and the prefabricated secondary beam and in the recess of the prefabricated secondary beam, the composite layer is formed, and the upper extension reinforcement of the prefabricated main beam and the upper extension reinforcement of the prefabricated secondary beam are both poured in the composite layer.

[0007] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated secondary beam comprises a plurality of secondary beam construction steel bars and a plurality of secondary beam stirrups and secondary beam lower longitudinal bars, the secondary beam construction steel bars are parallel to the secondary beam lower longitudinal bars, the main beam construction steel bars on both sides of the secondary beam notch are connected by corresponding secondary beam stirrups, the secondary beam construction steel bars, the plurality of secondary beam stirrups and the secondary beam lower longitudinal bars are poured together by concrete, and the secondary beam stirrups protrude upward from the surface of the concrete to form the upper extension steel bars of the prefabricated secondary beam.

[0008] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated secondary beam further comprises a plurality of inclined reinforcing bars, the plurality of inclined reinforcing bars are located inside the prefabricated secondary beam, a plurality of the inclined reinforcing bars are arranged on both sides of the secondary beam notch, the inclined reinforcing bars are located on the outside of the secondary beam notch, the upper ends of the inclined reinforcing bars are located above the secondary beam notch, the lower ends of the inclined reinforcing bars are located on both sides of the secondary beam notch, the plurality of inclined reinforcing bars are arranged at equal intervals along the width direction of the prefabricated secondary beam, and the inclined reinforcing bars are fixed by binding with adjacent secondary beam stirrups, secondary beam construction steel bars and secondary beam lower longitudinal bars.

[0009] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam comprises a plurality of main beam construction steel bars and a plurality of main beam stirrups and main beam lower longitudinal bars, the main beam construction steel bars are parallel to the main beam lower longitudinal bars, the main beam construction steel bars on both sides of the main beam notch are connected by corresponding main beam stirrups, the main beam construction steel bars, the plurality of main beam stirrups and the main beam lower longitudinal bars are poured together by concrete, and the main beam stirrups protrude upward from the surface of the concrete to form the upper extension steel bars of the prefabricated main beam.

[0010] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam further comprises a plurality of hanging bars, the plurality of hanging bars are arranged at equal intervals along the width direction of the prefabricated main beam, the hanging bar comprises a middle horizontal section, two inclined sections, two upper horizontal sections and two upper vertical sections, the middle horizontal section is arranged inside the prefabricated main beam, the middle horizontal section is located below the main beam notch, both ends of the middle horizontal section are connected with lower ends of the two inclined sections respectively, both ends of the two inclined sections are connected with one end of the two upper horizontal sections respectively, the other end of the two upper horizontal sections is connected with upper ends of the two lower vertical sections respectively, main body parts of the two inclined sections are located inside the prefabricated main beam on both sides of the main beam notch respectively, the upper horizontal sections are arranged above the upper surface of the concrete of the prefabricated main beam at intervals respectively, and the lower parts of the two vertical sections are arranged inside the concrete of the prefabricated main beam respectively, and the hanging bars are fixed by binding with adjacent main beam stirrups, main beam construction steel bars and main beam lower longitudinal bars.

[0011] Preferably, in the connecting structure of the prefabricated main and secondary beams, the depth of the secondary beam notch is greater than the depth of the main beam notch.

[0012] Preferably, in the connecting structure of the prefabricated main and secondary beams, the depth of the main beam notch is 2 / 1-3 / 2 of the depth of the secondary beam notch.

[0013] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam and the prefabricated secondary beam are both integrally prefabricated.

[0014] Preferably, in the connecting structure of the prefabricated main and secondary beams, the width of the groove on the two sides of the prefabricated secondary beam is 1 / 6-1 / 5 of the width of the main beam groove.

[0015] Preferably, in the connecting structure of the prefabricated main and secondary beams, the depth of the main beam notch is 3 / 10-2 / 5 of the thickness of the prefabricated main beam, and the depth of the secondary beam notch is 3 / 5-7 / 10 of the thickness of the prefabricated secondary beam.

[0016] From the above disclosed technical solutions, compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] In summary, the connecting structure of the prefabricated main and secondary beams provided by the utility model comprises a prefabricated main beam, a prefabricated secondary beam and a composite layer, a main beam notch is formed in the upper part of the prefabricated main beam at a position corresponding to the prefabricated secondary beam, a secondary beam notch is formed in the lower part of the prefabricated secondary beam at a position corresponding to the prefabricated main beam, a groove is formed in the upper part of the prefabricated secondary beam on the two sides of a position corresponding to the prefabricated main beam, the secondary beam notch of the prefabricated secondary beam is arranged on the main beam notch of the prefabricated main beam, forming a cross-shaped structure, the upper surface of the prefabricated main beam is flush with the upper surface of the prefabricated secondary beam, the prefabricated main beam and the prefabricated secondary beam are respectively provided with upward protruding upper extension steel bars, concrete is poured in a certain thickness above the prefabricated main beam and the prefabricated secondary beam and in the groove of the prefabricated secondary beam, forming the composite layer, and the upper extension steel bars of the prefabricated main beam and the upper extension steel bars of the prefabricated secondary beam are both poured in the composite layer.

[0018] On the one hand, notches are formed on the prefabricated main beam and the prefabricated secondary beam respectively, i.e. the main beam notch and the secondary beam notch, and the main beam and the secondary beam are connected through the notches. The notches on the main beam and the secondary beam, i.e. the main beam notch and the secondary beam notch, are relatively small, which can ensure that the height weakening of the prefabricated main beam 1 is relatively small and is beneficial to the shear performance of the prefabricated main beam. On the other hand, the prefabricated secondary beam 2 does not need to be disconnected at the connection position, and the main beam and the secondary beam are connected by overlapping the secondary beam notch on the main beam notch, so that the problem of difficulty in anchoring due to the dense reinforcement at the connection joint of the prefabricated main beam and the prefabricated secondary beam is avoided, the difficulty of construction at the joint is reduced, and the reinforcement does not need to be reserved at the notches between the prefabricated main beam and the prefabricated secondary beam, i.e. the main beam notch and the secondary beam notch, which is easy to ensure the construction quality of the post-cast layer. On the other hand, the prefabricated main beam and the prefabricated secondary beam are poured with concrete in a certain thickness above the prefabricated main beam and the prefabricated secondary beam and in the groove of the prefabricated secondary beam to form the composite layer. Therefore, the prefabricated main beam and the prefabricated secondary beam can not only be indirectly connected through the main part of the composite layer located above the prefabricated main beam and the prefabricated secondary beam, but also be directly connected through the concrete part embedded in the groove between the prefabricated main beam and the prefabricated secondary beam on the composite layer, so that the connection strength between the prefabricated main beam and the prefabricated secondary beam is effectively improved, and the shear performance of the connection structure of the prefabricated main beam and the prefabricated secondary beam is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of a connection structure of prefabricated main and secondary beams (not including a composite layer).

[0020] Figure 2 FIG. 5 is a diagram of the reinforcement distribution and the position of the main beam notch of the prefabricated main beam.

[0021] Figure 3 FIG. 6 is a top view of the prefabricated main beam.

[0022] Figure 4 FIG. 7 is a diagram of the reinforcement distribution and the position of the secondary beam notch of the prefabricated secondary beam.

[0023] Figure 5 FIG. 8 is a top view of the prefabricated secondary beam.

[0024] Figure 6 FIG. 9 is a three-dimensional schematic diagram of the connection between the prefabricated main beam and the prefabricated secondary beam.

[0025] Figure 7 FIG. 10 is a structural schematic diagram of the composite layer.

[0026] In the figure: 1-prefabricated main beam, 10-main beam notch, 11-main beam construction reinforcement, 12-main beam stirrup, 13-main beam lower longitudinal reinforcement, 14-hanging reinforcement, 2-prefabricated secondary beam, 20-secondary beam notch, 21-secondary beam construction reinforcement, 22-main beam stirrup, 23-secondary beam lower longitudinal reinforcement, 24-inclined reinforcement, 25-groove, 3-composite layer. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and specific embodiments. The technical content and features of the utility model will be explained in detail below in combination with the enumerated embodiments and the drawings. It should be additionally explained that the drawings are all very simplified and all use non-precise proportions, and are only used to conveniently and clearly assist in explaining the purposes of the embodiments of the utility model. For the convenience of description, the "upper", "lower" described below are consistent with the upper and lower directions of the drawings, but this cannot become the restriction of the technical scheme of the utility model.

[0028] Please refer to Figures 1 to 7 The embodiment discloses a kind of connecting structure of prefabricated main beam and secondary beam, including prefabricated main beam 1, prefabricated secondary beam 2 and composite layer 3, i.e., post-cast layer, a main beam notch 10 is opened in the upper portion of prefabricated main beam 1 corresponding to the position of prefabricated secondary beam 2, a secondary beam notch 20 is opened in the lower portion of prefabricated secondary beam 2 corresponding to the position of prefabricated main beam 1, a recess 25 is opened in the upper portion of prefabricated secondary beam 2 corresponding to the position of prefabricated main beam 1 respectively to the two sides inward, the secondary beam notch 20 of the prefabricated secondary beam 2 is arranged on the main beam notch 10 of the prefabricated main beam 1, forms a cross type structure, the upper surface of the prefabricated main beam 1 is flush with the upper surface of the prefabricated secondary beam 2, the prefabricated main beam 1 and prefabricated secondary beam 2 are respectively provided with the upper extension reinforcement that protrudes upward, the concrete is poured in the recess 25 of prefabricated secondary beam 2 and the thickness above prefabricated main beam 1 and prefabricated secondary beam 2, forms the composite layer 3, the upper extension reinforcement of prefabricated main beam 1 and the upper extension reinforcement of prefabricated secondary beam 2 are all poured in the composite layer 3. As can be seen from the above, the connecting structure of prefabricated main beam and secondary beam provided by the application, on the one hand, notches, i.e., main beam notch 10 and secondary beam notch 20, are opened in prefabricated main beam and secondary beam respectively, and the notches, i.e., main beam notch 10 and secondary beam notch 20, on prefabricated main beam and secondary beam are small, which can ensure that the height of prefabricated main beam 1 is weakened little, and is conducive to the shear performance of prefabricated main beam 1. On the other hand, prefabricated secondary beam 2 does not need to be disconnected at the connection part, and the connection between main beam and secondary beam is realized by overlapping secondary beam notch 20 on main beam notch 10, thereby avoiding the problem of difficulty in anchoring due to dense reinforcement at the connection joint of prefabricated main beam and secondary beam, reducing the difficulty of construction at the joint, and the notches, i.e., main beam notch 10 and secondary beam notch 20, between prefabricated main beam and secondary beam do not need to reserve reinforcement, which is easy to ensure the construction quality of post-cast layer. On the other hand, the concrete is poured in the recess 25 of prefabricated secondary beam 2 and the thickness above prefabricated main beam 1 and prefabricated secondary beam 2, forms the composite layer 3, therefore, prefabricated main beam 1 and prefabricated secondary beam not only can be indirectly connected through the main part of the composite layer 3 located above prefabricated main beam 1 and prefabricated secondary beam 2, but also can be directly connected through the concrete part embedded in the recess 25 between prefabricated main beam 1 and prefabricated secondary beam 2 on the composite layer 3, thereby effectively improving the connection strength between prefabricated main beam 1 and prefabricated secondary beam 2, and further improving the shear performance of the connecting structure of prefabricated main beam and secondary beam.

[0029] Preferably, in the connecting structure of the prefabricated main and secondary beams, the thickness is 1 / 4-1 / 3 of the thickness of the prefabricated main beam 1, so as to ensure the connecting reliability between the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0030] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated secondary beam 2 comprises a plurality of secondary beam construction steel bars 21 and a plurality of secondary beam stirrups 22 and secondary beam lower longitudinal bars 23, the secondary beam construction steel bars 21 are parallel to the secondary beam lower longitudinal bars 23, the main beam construction steel bars 11 on both sides of the secondary beam notch 20 are connected through the corresponding secondary beam stirrups 22, and the secondary beam construction steel bars 21, the plurality of secondary beam stirrups 22 and the secondary beam lower longitudinal bars 23 are poured together by concrete, and the secondary beam stirrups 22 protrude upwards from the surface of the concrete to form the upper extension steel bars of the prefabricated secondary beam 2.

[0031] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated secondary beam 2 further comprises a plurality of inclined reinforcing bars 24, the plurality of inclined reinforcing bars 24 are located inside the prefabricated secondary beam 2, a plurality of the inclined reinforcing bars 24 are arranged on both sides of the secondary beam notch 20, the inclined reinforcing bars 24 are located outside the secondary beam notch 20, the upper ends of the inclined reinforcing bars 24 are located above the secondary beam notch 20, the lower ends of the inclined reinforcing bars 24 are located on both sides of the secondary beam notch 20, the plurality of inclined reinforcing bars 24 are arranged at equal intervals along the width direction of the prefabricated secondary beam 2, and the inclined reinforcing bars 24 are fixedly bound with the adjacent secondary beam stirrups 22, secondary beam construction steel bars 21 and secondary beam lower longitudinal bars 23. The secondary beam notch 20 is reinforced by the inclined reinforcing bars 24, so as to increase the connecting strength and stability of the connecting structure of the prefabricated main and secondary beams.

[0032] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam 1 comprises a plurality of main beam construction steel bars 11 and a plurality of main beam stirrups 12 and main beam lower longitudinal bars 13, the main beam construction steel bars 11 are parallel to the main beam lower longitudinal bars 13, the main beam construction steel bars 11 on both sides of the main beam notch 10 are connected through the corresponding main beam stirrups 12, and the main beam construction steel bars 11, the plurality of main beam stirrups 12 and the main beam lower longitudinal bars 13 are poured together by concrete, and the main beam stirrups 12 protrude upwards from the surface of the concrete to form the upper extension steel bars of the prefabricated main beam 1.

[0033] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam 1 further comprises a plurality of hanging bars 14, which are arranged equidistantly along the width direction of the prefabricated main beam 1, and each of the hanging bars 14 comprises a middle horizontal section, two inclined sections, two upper horizontal sections and two upper vertical sections, the middle horizontal section is arranged inside the prefabricated main beam 1 and is below the main beam notch 10, the two ends of the middle horizontal section are connected with the lower ends of the two inclined sections respectively, the two ends of the two inclined sections are connected with one end of the two upper horizontal sections respectively, the other end of the two upper horizontal sections is connected with the upper end of the two lower vertical sections respectively, the main body of the two inclined sections is arranged inside the prefabricated main beam 1 on both sides of the main beam notch 10 respectively, the two upper horizontal sections are arranged above the upper surface of the concrete of the prefabricated main beam 1 respectively, and the lower parts of the two vertical sections are arranged inside the concrete of the prefabricated main beam 1 respectively, the hanging bars 14 are bound and fixed with the adjacent main beam stirrups 12, main beam constructional steel bars 11 and main beam lower longitudinal bars 13. By arranging the hanging bars 14, the prefabricated main beam 1 is convenient to hoist, and the strength of the structure of the prefabricated main beam 1 itself is improved.

[0034] Preferably, in the connecting structure of the prefabricated main and secondary beams, the prefabricated main beam 1 and the prefabricated secondary beam 2 are both integrally prefabricated. Since the prefabricated main beam 1 and the prefabricated secondary beam 2 are both integrally prefabricated, the number of prefabricated components on the construction site can be effectively reduced, and the construction management is facilitated.

[0035] Preferably, in the connecting structure of the prefabricated main and secondary beams, the depth of the secondary beam notch 20 is greater than the depth of the main beam notch 10. In the embodiment, the depth of the main beam notch 10 is 2 / 1-3 / 2 of the depth of the secondary beam notch 20.

[0036] Preferably, in the connecting structure of the prefabricated main and secondary beams, the width of the groove 25 on both sides of the prefabricated secondary beam 2 is 1 / 6-1 / 5 of the width of the main beam groove 25, so that the prefabricated main beam 1 and the prefabricated secondary beam 2 are indirectly connected by the superposition layer on the top of the prefabricated main beam 1 and the prefabricated secondary beam 2, the indirect connection between the prefabricated main beam 1 and the prefabricated secondary beam 2 is realized, and a better balance point between the strength of the prefabricated secondary beam 2 itself and the strength of the concrete of the superposition layer 3 in the groove can be ensured.

[0037] Preferably, in the connecting structure of the prefabricated main and secondary beams, the depth of the main beam notch 10 is 3 / 10-2 / 5 of the thickness of the prefabricated main beam 1, and the depth of the secondary beam notch 20 is 3 / 5-7 / 10 of the thickness of the prefabricated secondary beam 2. The smaller depth of the main beam notch 10 and the secondary beam notch 20 can ensure that the height weakening of the prefabricated main beam 1 is small, which is beneficial to the shear performance of the prefabricated main beam 1.

[0038] The above description is only the description of the preferred embodiment of the utility model, and does not limit the utility model in any way, and any change and modification of the utility model made by the ordinary skilled in the art according to the above disclosure are within the protection scope of the claims.

Claims

1. A prefabricated primary and secondary beam connection structure, characterized in that: It includes a prefabricated main beam, a prefabricated secondary beam and a superimposed layer, a main beam notch is opened on the upper part of the prefabricated main beam at a position corresponding to the prefabricated secondary beam, a secondary beam notch is opened on the lower part of the prefabricated secondary beam at a position corresponding to the prefabricated main beam, and a groove is opened inward on both sides of the upper part of the prefabricated secondary beam at a position corresponding to the prefabricated main beam, the secondary beam notch of the prefabricated secondary beam is arranged on the main beam notch of the prefabricated main beam to form a cross-shaped structure, the upper surface of the prefabricated main beam is flush with the upper surface of the prefabricated secondary beam, the prefabricated main beam and the prefabricated secondary beam are respectively provided with upwardly protruding upper extension steel bars, concrete is poured at a certain thickness above the prefabricated main beam and the prefabricated secondary beam and in the grooves of the prefabricated secondary beam to form the superimposed layer, and the upper extension steel bars of the prefabricated main beam and the upper extension steel bars of the prefabricated secondary beam are both poured in the superimposed layer.

2. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The prefabricated secondary beam includes a number of secondary beam structural steel bars, a number of secondary beam stirrups and a secondary beam lower longitudinal bar. The secondary beam structural steel bars are parallel to the secondary beam lower longitudinal bar. The main beam structural steel bars located on both sides of the secondary beam notch are connected by corresponding secondary beam stirrups. The secondary beam structural steel bars, the number of secondary beam stirrups and the secondary beam lower longitudinal bar are cast together by concrete. The secondary beam stirrups protrude upward from the surface of the concrete to form the upper extension steel bars of the prefabricated secondary beam.

3. The connection structure of prefabricated primary and secondary beams according to claim 2, characterized in that: The prefabricated secondary beam also includes a plurality of oblique reinforcing ribs, which are located inside the prefabricated secondary beam. A plurality of oblique reinforcing ribs are respectively arranged on both sides of the secondary beam notch. The oblique reinforcing ribs are located on the outside of the secondary beam notch. The upper ends of the oblique reinforcing ribs are located above the secondary beam notch, and the lower ends of the oblique reinforcing ribs are located on both sides of the secondary beam notch. The plurality of oblique reinforcing ribs are arranged at equal intervals along the width direction of the prefabricated secondary beam, and the oblique reinforcing ribs are tied and fixed to the adjacent secondary beam stirrups, secondary beam structural steel bars and the lower longitudinal bars of the secondary beam.

4. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The prefabricated main beam includes a number of main beam structural steel bars, a number of main beam stirrups and a main beam lower longitudinal bar. The main beam structural steel bars are parallel to the main beam lower longitudinal bar. The main beam structural steel bars located on both sides of the main beam notch are connected by corresponding main beam stirrups. The main beam structural steel bars, the number of main beam stirrups and the main beam lower longitudinal bar are cast together by concrete. The main beam stirrups protrude upward from the surface of the concrete to form the upper extension steel bars of the prefabricated main beam.

5. The connection structure of prefabricated primary and secondary beams according to claim 4, characterized in that: The precast main beam also includes a plurality of hangers, which are arranged at equal intervals along the width direction of the precast main beam, and the hangers include a middle horizontal section, two oblique sections, two upper horizontal sections and two upper vertical sections. The middle horizontal section is arranged inside the precast main beam, and the middle horizontal section is located below the main beam notch. Both ends of the middle horizontal section are respectively connected to the lower ends of the two oblique sections, and both ends of the two oblique sections are respectively connected to one end of the two upper horizontal sections, and the other ends of the two upper horizontal sections are respectively connected to the upper ends of the two lower vertical sections. The main parts of the two oblique sections are respectively located in the precast main beams on both sides of the main beam notch, the upper horizontal sections are respectively arranged at intervals above the upper surface of the concrete of the precast main beam, and the lower parts of the two vertical sections are respectively arranged inside the concrete of the precast main beam, and the hangers are tied and fixed to adjacent main beam stirrups, main beam structural steel bars and main beam lower longitudinal bars.

6. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The depth of the secondary beam notch is greater than the depth of the main beam notch.

7. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The depth of the main beam notch is 2 / 1 to 3 / 2 of the depth of the secondary beam notch.

8. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The prefabricated main beams and prefabricated secondary beams are all prefabricated in one piece.

9. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The width of the grooves on both sides of the prefabricated secondary beam is 1 / 6 to 1 / 5 of the width of the groove of the main beam.

10. The connection structure of prefabricated primary and secondary beams according to claim 1, characterized in that: The depth of the main beam notch is 3 / 10 to 2 / 5 of the thickness of the prefabricated main beam, and the depth of the secondary beam notch is 3 / 5 to 7 / 10 of the thickness of the prefabricated secondary beam.

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