Fabricated concrete primary and secondary beam connecting structure

Abstract

The utility model discloses an assembly type concrete primary and secondary beam connecting structure which comprises a primary beam (1) and a secondary beam (2), a plurality of notches (11) are formed in the end portion of the primary beam (1), a plurality of trusses (4) are arranged between the secondary beam (2) and the primary beam (1), one end of each truss (4) is embedded in the end portion of the secondary beam (2), and the other end of each truss (4) extends out of the secondary beam (2) to be supported on the notches (11) of the primary beam (1). And a concrete laminated layer (5) is poured above the main beam (1), the secondary beam (2) and the truss (4). The utility model has the characteristics that the construction is simple, the cost is saved, and the stability is improved.

Description

Technical Field

[0001] The utility model relates to an assembled concrete building structure, in particular to an assembled concrete primary and secondary beam connection structure. Background Art

[0002] With the decline of the demographic dividend and the increasingly serious labor shortage, the application of prefabricated buildings is becoming more and more extensive.

[0003] Prefabricated buildings refer to a construction method in which components are prefabricated in factories and then assembled on site. This construction method has the advantages of being fast, efficient, and resource-saving, and is increasingly favored by the construction industry. The connection method of prefabricated primary and secondary beams is crucial to the stability and safety of the entire building structure. Different connection methods are suitable for different scenarios and needs.

[0004] The connection of prefabricated primary and secondary beams in prefabricated buildings generally adopts connection methods such as partial reservation of cast-in-place sections of the main beam and ox-carrying plates. When the partial reservation of cast-in-place sections of the main beam is adopted, a cast-in-place section is reserved in the middle of the prefabricated main beam, the bottom reinforcement remains continuous, and the bottom reinforcement of the prefabricated secondary beam will extend from the end face and enter the vacant section of the prefabricated main beam, and then the concrete is poured to form an overall connection; however, temporary support needs to be set up during construction, and when the waist reinforcement of the main beam has torsional resistance requirements, the steel bars need to be welded or mechanically connected, the construction process is relatively complicated, and the construction quality is difficult to control.

[0005] When using ox-bar connection, steel plates need to be reserved at the ends of the secondary beams and bolts need to be set on the steel plates, which is costly and has poor overall stability. Utility Model Content

[0006] The purpose of the utility model is to provide an assembled concrete primary and secondary beam connection structure, which has the characteristics of simple construction, cost saving and improved stability.

[0007] The technical solution of the utility model is: an assembled concrete main-secondary beam connection structure, including a main beam and a secondary beam, a plurality of notches are provided at the end of the main beam, a plurality of trusses are provided between the secondary beam and the main beam, one end of the truss is embedded in the end of the secondary beam, and the other end of the truss extends out of the secondary beam and is supported on the notch of the main beam, and a concrete superposition layer is cast above the main beam, the secondary beam and the truss.

[0008] In the aforementioned prefabricated concrete primary and secondary beam connection structure, the embedded length of the truss is not less than the extended length of the truss and is not less than 1000 mm.

[0009] In the aforementioned assembled concrete primary and secondary beam connection structure, the truss is welded by any one or a combination of multiple types of steel bars, square steels or round steels.

[0010] In the aforementioned prefabricated concrete primary and secondary beam connection structure, the truss is a solid-web truss or a hollow-web truss.

[0011] In the aforementioned prefabricated concrete primary and secondary beam connection structure, the extension length of the truss extending out of the secondary beam is not less than 1 / 180L and not less than 50 mm, where L represents the span of the secondary beam.

[0012] In the aforementioned assembled concrete main and secondary beam connection structure, the portion of the truss located at the notch is provided with embedded parts connected to the main beam.

[0013] In the aforementioned assembled concrete primary and secondary beam connection structure, the ends of the secondary beams are provided with a plurality of dense stirrups connected to the concrete superimposed layer.

[0014] In the aforementioned prefabricated concrete main and secondary beam connection structure, the length of the dense stirrups is not less than 1000 mm and not less than the embedded length of the truss pre-embedded in the secondary beam, and the spacing between two adjacent dense stirrups is not greater than 100 mm.

[0015] In the aforementioned prefabricated concrete main-secondary beam connection structure, at least two first longitudinal bars are provided at the top of the secondary beam, and second longitudinal bars are provided at the bottom of the secondary beam. The diameters of the first longitudinal bars and the second longitudinal bars are not less than 10 mm.

[0016] In the aforementioned assembled concrete main and secondary beam connection structure, additional stirrups and / or hanger bars are provided on both sides of the notch in the main beam.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model embeds a truss at the end of the secondary beam, reserves a notch at the end of the main beam, and the outer end of the truss extends outward to the notch of the main beam for support; after installation, the secondary beam, the main beam, the truss and the concrete superposition layer are cast together to be dense. During the construction process, a support-free construction process is realized, which is convenient for installation, and saves construction time and cost.

[0019] Furthermore, since the truss is welded by steel bars, square steel or round steel, the connection between the secondary beam and the truss is strengthened, the bolts are eliminated, and the cost is saved.

[0020] The utility model has a clear mechanical model, a simple node structure, is easy to construct, and has a low construction cost. It is suitable for various prefabricated primary and secondary beam connection nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 yes Figure 1 Cross-sectional view of Figure 1-1.

[0023] Figure 3 yes Figure 1 Cross-sectional view of Figure 2-2.

[0024] Figure 4 yes Figure 1 Cross-sectional view of Figure 3-3.

[0025] Figure 5 This is a schematic diagram of the reinforcement structure inside the main beam.

[0026] The markings in the attached figure are: 1. main beam; 11. notch; 12. additional stirrups; 13. hanger bars; 2. secondary beam; 21. increased stirrups; 22. first longitudinal bars; 23. second longitudinal bars; 3. embedded parts; 4. truss; 41. reinforcing stirrups; 5. superimposed layer. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example:

[0030] like Figure 1-Figure 4 As shown, an assembled concrete main-secondary beam connection structure includes a precast main beam 1 and a precast secondary beam 2, a plurality of notches 11 are provided at the end of the precast main beam 1, a plurality of trusses 4 are provided between the precast secondary beam 2 and the precast main beam 1, one end of the truss 4 is embedded in the end of the precast secondary beam 2, and the other end of the truss 4 extends out of the precast secondary beam 2 and is supported on the notch 11 of the precast main beam 1, and a concrete superposition layer 5 is integrally cast above the precast main beam 1, the precast secondary beam 2 and the truss 4.

[0031] The width of the notch 11 of the prefabricated main beam 1 is the width of the lower chord of the truss 4 + 20 to 30 mm, and the depth of the notch 11 is the height of the truss 4 + 10 to 30 mm, which meets the requirements for the placement of the truss 4.

[0032] The shape of the notch 11 is an inverted trapezoid.

[0033] The width and depth of the notch 11 of the main beam 1 are both small, and the installation accuracy is easy to control, which is beneficial to the force calculation of the main beam 1 in the unsupported design.

[0034] The truss 4 is welded by any one or a combination of steel bars, square steel bars or round steel bars. Using steel bars, square steel bars or round steel bars as the chord and web members of the truss 4 increases the bond strength between the concrete and the truss 4, does not require the installation of bolts, can ensure the joint working mechanism between the truss 4 and the concrete, and improves the installation stability of the truss 4.

[0035] The truss 4 may be one or at least two.

[0036] The truss 4 is a solid-web truss 4 or a hollow-web truss 4 .

[0037] The extension length of the truss 4 extending out of the prefabricated secondary beam 2 is not less than 1 / 180L and not less than 50 mm, where L represents the span of the prefabricated secondary beam 2. The safety and stability of the truss installation are improved.

[0038] The embedded part of the truss 4 is provided with reinforcing stirrups 41 connected to the secondary beam 2, so as to improve the stability of the connection structure between the prefabricated secondary beam 2 and the truss 4.

[0039] The embedding length of the truss 4 embedded in the prefabricated secondary beam 2 is not less than the anchoring length placed on the prefabricated main beam 1, and is not less than 1000 mm.

[0040] The part of the truss 4 located at the notch 11 is provided with an embedded part 3 connected to the prefabricated main beam 1, so as to improve the stability of the connection structure between the prefabricated main beam 1 and the truss 4.

[0041] The end of the precast secondary beam 2 is provided with a plurality of dense stirrups 21 connected to the concrete laminated layer 5, which effectively improves the strength of the precast secondary beam 2. The length of the dense stirrups 21 is not less than 1000 mm and not less than the embedded length of the truss 4 pre-embedded in the precast secondary beam 2. The spacing between two adjacent dense stirrups 21 is not greater than 100 mm.

[0042] At least two first longitudinal bars 22 are provided at the top of the precast secondary beam 2, and second longitudinal bars 23 are provided at the bottom of the precast secondary beam 2. The diameters of the first longitudinal bars 22 and the second longitudinal bars 23 are not less than 10 mm. The first longitudinal bars 22 and the second longitudinal bars 23 are tied together with the dense stirrups 21 and the reinforcing stirrups 41.

[0043] like Figure 5 As shown, additional stirrups 12 and / or hanger bars 13 are provided on both sides of the notch 11 in the prefabricated main beam 1. The addition of nodes effectively improves the strength of the prefabricated main beam 1 and meets the force transmission requirements.

[0044] The construction process of the utility model is as follows:

[0045] (1) The construction of the lower prefabricated or cast-in-place columns or steel columns is completed, and the elevation, positioning and verticality of the columns are verified;

[0046] (2) Construct the prefabricated main beam 1 of this layer and check the axis dimension and elevation;

[0047] (3) hoisting the prefabricated secondary beam 2 of the current layer, wherein the truss 4 and the prefabricated secondary beam 2 are prefabricated as a whole;

[0048] (4) Hoisting the prefabricated floor slabs of this floor;

[0049] (5) pouring the superimposed layer 5;

[0050] (6) Install the prefabricated or cast-in-place columns or steel columns of this layer, and repeat steps (1) to (5). The parts not described in detail in the present invention are prior art and will not be elaborated here.

Claims

1. An assembled concrete main and secondary beam connection structure, comprising a main beam (1) and a secondary beam (2), Features: The end of the main beam (1) is provided with a plurality of notches (11); a plurality of trusses (4) are provided between the secondary beam (2) and the main beam (1); one end of the truss (4) is pre-buried in the end of the secondary beam (2); the other end of the truss (4) extends out of the secondary beam (2) and is supported on the notch (11) of the main beam (1); and a concrete laminated layer (5) is cast above the main beam (1), the secondary beam (2) and the truss (4).

2. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The embedded length of the truss (4) is not less than the extended length of the truss (4) and is not less than 1000 mm.

3. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The truss (4) is welded from any one or a combination of multiple types of steel bars, square steel bars or round steel bars.

4. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The truss (4) is a solid-web truss (4) or a hollow-web truss (4).

5. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The extension length of the truss (4) extending out of the secondary beam (2) is not less than 1 / 180L and not less than 50 mm, where L represents the span of the secondary beam (2).

6. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The part of the truss (4) located at the notch (11) is provided with an embedded part (3) connected to the main beam (1).

7. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: The ends of the secondary beam (2) are provided with a plurality of dense stirrups (21) connected to the concrete laminated layer (5).

8. The assembled concrete primary and secondary beam connection structure according to claim 7, Features: The length of the denser stirrups (21) is not less than 1000 mm and not less than the embedding length of the truss (4) pre-embedded in the secondary beam (2), and the spacing between two adjacent denser stirrups (21) is not greater than 100 mm.

9. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: At least two first longitudinal ribs (22) are provided at the top of the secondary beam (2), and a second longitudinal rib (23) is provided at the bottom of the secondary beam (2), and the diameters of the first longitudinal rib (22) and the second longitudinal rib (23) are not less than 10 mm.

10. The assembled concrete primary and secondary beam connection structure according to claim 1, Features: Additional stirrups (12) and / or hanger bars (13) are provided on both sides of the notch (11) in the main beam (1).

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