Fabricated concrete primary and secondary beam connecting joint of building structure and construction method of fabricated concrete primary and secondary beam connecting joint

Abstract

The invention discloses a building structure assembly type concrete primary and secondary beam connecting joint and a construction method, and belongs to the technical field of building assembly. The building structure assembly type concrete primary and secondary beam connecting joint comprises a prefabricated primary beam and a prefabricated secondary beam, a notch is reserved in the joint position of the prefabricated primary beam and the prefabricated secondary beam, an embedded anchor plate is arranged in the prefabricated primary beam, and anchor plate steel bars are welded to the embedded anchor plate; angle steel is arranged on the two sides of the notch, one end of the angle steel is in lap joint with the embedded anchor plate, and the other end of the angle steel is located in the prefabricated secondary beam. The problems that an existing prefabricated main beam groove causes local weakness of a component, the risk that the component is prone to being broken in the transportation or hoisting stage is increased, and the existing prefabricated main beam groove is not suitable for a secondary beam with torque are solved. Compared with the prior art, the unequal-limb angle steel joints have high anti-torsion bearing capacity, so that the torque problem of the secondary beam in the construction process is solved, the unequal-limb angle steel joints have high shear capacity, and construction is easy.

Description

Technical Field

[0001] The invention relates to the technical field of building assembly, and in particular to a building structure assembled concrete primary and secondary beam connection node and a construction method. Background Art

[0002] At present, there are three common forms of connection between the main and secondary beam nodes in prefabricated structures:

[0003] The first form is: the post-cast section is set at the main beam, that is, a transverse groove is set at the main beam connection, the end of the secondary beam is erected at the groove, and the connection between the main and secondary beams is achieved by cast-in-place concrete in the main beam groove area. The construction speed of this node is fast, but the groove of the prefabricated main beam causes local weakness of the component, making the prefabricated main beam prone to breakage, cracks and other quality problems during lifting or transportation.

[0004] The second form is: the post-casting section is set at the secondary beam, that is, a cast-in-place interval is reserved at the end of the prefabricated secondary beam, and after being connected with the bottom longitudinal reinforcement reserved on the side of the main beam, the cast-in-place interval is cast to achieve connection with the main beam. This node ensures the integrity of the prefabricated main beam, but it is necessary to support the bottom formwork at the cast-in-place section of the secondary beam, which weakens the convenience of prefabricated construction. Even if a notch is left at the end of the secondary beam, it will increase the risk of breakage during transportation or lifting.

[0005] The third form is: the shelved type, that is, the end of the secondary beam is directly placed on the corbel or lug on the side of the main beam. This method is the most convenient, but the conventional shelved main and secondary beam nodes are prone to overturning during construction, and the safety of the structure is difficult to ensure. Therefore, the conventional shelved main and secondary beam nodes are not suitable for secondary beams with torque, which limits the application of the shelved type.

[0006] In order to solve the above problems, the present invention proposes a prefabricated concrete primary and secondary beam connection node for a building structure. Summary of the invention

[0007] The object of the present invention is to provide a connection node and a construction method for prefabricated concrete primary and secondary beams of a building structure. The unequal-leg angle steel nodes have a higher torsional bearing capacity, thereby solving the torque problem caused by the secondary beam during the construction process. By adopting unequal-leg angle steels (two angle steels are arranged in an inverted T shape), the nodes have a high shear resistance, thereby solving the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A prefabricated concrete main-secondary beam connection node for a building structure comprises a prefabricated main beam and a prefabricated secondary beam, wherein a notch is reserved at the intersection of the prefabricated main beam and the prefabricated secondary beam, an embedded anchor plate is arranged inside the prefabricated main beam, anchor plate steel bars are welded to the embedded anchor plate, and the anchor plate steel bars are arranged vertically; connectors are symmetrically arranged on both sides of the notch, and the connectors on each side are composed of two angle steels arranged back to back, the angle steel extends along the length direction of the prefabricated secondary beam, one end of the angle steel is overlapped on the embedded anchor plate, and the other end of the angle steel is located inside the prefabricated secondary beam, the angle steel is an unequal limb structure, and bolts are welded on the side of the back of the long limb of the angle steel.

[0010] Preferably, the portion of the angle steel located on the embedded anchor plate does not exceed one quarter of the overall extension length of the angle steel.

[0011] Preferably, the single row of reinforcement bars of the prefabricated secondary beam extends into the prefabricated main beam.

[0012] Preferably, the studs are connected to the concrete poured into the precast secondary beam, and the anchor plate reinforcement is connected to the concrete poured into the precast main beam.

[0013] Preferably, the embedded anchor plate is a horizontally arranged rectangular plate, and the long side of the embedded anchor plate extends along the length direction of the prefabricated main beam.

[0014] Preferably, the longitudinal cross-section formed by the two angle steels is in an inverted T-shape.

[0015] Preferably, the notch is provided with angle steels on both sides extending 10 mm in the width direction of the square steel pipe column.

[0016] Preferably, the thickness of a single angle steel is within the range of 6 to 10 mm, the thickness of the embedded anchor plate is within the range of 6 to 15 mm, the diameter of the bolt is within the range of M10 to M16, and the diameter of the anchor plate steel bar is within the range of 8 to 16 mm.

[0017] Preferably, the number of bolts on each side of the angle steel is not less than three.

[0018] A construction method for a building structure assembled concrete primary and secondary beam connection node is implemented based on a building structure assembled concrete primary and secondary beam connection node, comprising the following steps:

[0019] Step 1: fix the embedded anchor plate with vertical welded anchor plate steel bars in the prefabricated main beam;

[0020] Step 2: Reserve a notch of appropriate width at the junction of the prefabricated main beam and the prefabricated secondary beam, so that the notches on both sides extend outward by 10mm each;

[0021] Step 3: Place two angle steels on the embedded anchor plate and inside the prefabricated secondary beam, respectively, and ensure that the portion of the angle steel located on the embedded anchor plate does not exceed one quarter of its total length;

[0022] Step 4: After all parts are assembled, pour concrete inside the square steel pipe column so that the angle steel, studs, embedded anchor plates and anchor plate steel bars work together with the concrete to form a solid integral node.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The connection node proposed in the present invention can bear the shear force and torque generated by the construction load during the construction stage. Since the unequal-leg angle steel node has a high torsional bearing capacity, the torque problem caused by the secondary beam during the construction process is solved. During the use stage, due to the use of unequal-leg angle steel (two angle steels are arranged in an inverted T shape), it has a high shear resistance and can bear bending moment, shear force and torque, thus solving the shortcomings of traditional practices, with a simple structure and quick construction.

[0025] 2. In the present invention, the shelved primary and secondary beam connection nodes are simple in structure and easy to install. There is no need to set up a post-casting section, which reduces on-site wet work and eliminates the need for on-site welding. At the same time, the construction speed of the torsion-resistant secondary beam is improved, which has obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the connection between the prefabricated main beam and the prefabricated secondary beam of the present invention;

[0027] Figure 2 For the present invention Figure 1 AA section diagram in;

[0028] Figure 3 For the present invention Figure 1 Schematic diagram of the BB cross section.

[0029] In the figure: 1. Prefabricated main beam; 2. Prefabricated secondary beam; 3. Notch; 4. Angle steel; 5. Studs; 6. Embedded anchor plate; 7. Anchor plate steel bar; 8. Stirrups; 9. Floor slab. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to solve the problem that the existing prefabricated main beam grooves cause local weakness of the components, increase the risk of easy breakage during transportation or lifting, and are not suitable for secondary beams with torque, please refer to Figure 1-3 , this embodiment provides the following technical solutions:

[0032] A prefabricated concrete main and secondary beam connection node for a building structure comprises a prefabricated main beam 1 and a prefabricated secondary beam 2. A notch 3 for pouring concrete is reserved at the intersection of the prefabricated main beam 1 and the prefabricated secondary beam 2. The width of the notch 3 is reserved according to the width of a square steel pipe column below the notch 3. Both sides of the notch 3 can be 10 mm larger than the width of the square steel pipe column.

[0033] An embedded anchor plate 6 is provided inside the prefabricated main beam 1. The embedded anchor plate 6 is a horizontally arranged rectangular plate. The long side of the embedded anchor plate 6 is arranged along the length direction of the prefabricated main beam 1. The embedded anchor plate 6 is provided with a hole for the anchor plate steel bar 7 to pass through. The anchor plate steel bar 7 is vertically arranged and welded to the embedded anchor plate 6.

[0034] Connectors are symmetrically arranged on both sides of the slot 3. Each connector is composed of two angle steels 4 facing each other. The longitudinal cross-section of the two angle steels 4 is inverted T-shape, which makes it have high shear resistance, thereby greatly improving the shear bearing capacity of the connection node.

[0035] The angle steel 4 is arranged along the length direction of the prefabricated secondary beam 2, and the two ends of the angle steel 4 are respectively connected to the prefabricated main beam 1 and the prefabricated secondary beam 2. One end of the angle steel 4 is overlapped on the embedded anchor plate 6, and the other end of the angle steel 4 is located inside the prefabricated secondary beam 2; the part of the angle steel 4 located on the embedded anchor plate 6 does not exceed one quarter of the overall extension length of the angle steel 4.

[0036] The angle steel 4 is an unequal-leg structure. Since the nodes of the unequal-leg angle steel 4 have a high torsional bearing capacity, the torque problem caused by the prefabricated secondary beam 2 during the construction process is solved.

[0037] Studs 5 are welded on the side of the long limb of the angle steel 4, and the number of studs 5 on each side of the angle steel 4 is not less than three; by welding, the number of studs 5 on the side of the angle steel 4 can be reduced, the thickness of the angle steel 4 can be reduced, and the shear bearing capacity and torsional bearing capacity of the prefabricated secondary beam 2 can be improved; the angle steel 4 is subjected to force together with the concrete part in the prefabricated secondary beam 2 through the studs 5.

[0038] The angle steel 4 is a general material that can be purchased on the market, and the cross-sectional size of the angle steel 4 is adjusted according to the size and stress conditions of the prefabricated secondary beam 2.

[0039] The single row of reinforcement bars of the precast secondary beam 2 extends into the precast main beam 1, and after the angle steel 4, studs 5, embedded anchor plates 6 and anchor plate steel bars 7 are connected, concrete is poured inside the square steel pipe column, so that the portion of the angle steel 4 located inside the precast secondary beam 2 is connected to the concrete of the precast secondary beam 2 to form steel tube concrete, the studs 5 are connected to the concrete of the precast secondary beam 2, and the anchor plate steel bars 7 are connected to the concrete of the precast main beam 1, forming the entire node. The node can make the precast main beam 1 and the precast secondary beam 2 of the building structure form a common force-bearing whole, which can withstand a larger load.

[0040] The web thickness of the angle steel 4 is 8 mm, the thickness of the embedded anchor plate 6 is 10 mm, the diameter of the stud 5 is M12, and the diameter of the anchor plate steel bar 7 is 12 mm.

[0041] As a variation of the present invention, the web thickness of the angle steel 4 can also be within the range of 6-10 mm, the thickness of the embedded anchor plate 6 can be within the range of 6-15 mm, the diameter of the stud 5 can be within the range of M10-M16, and the diameter of the anchor plate steel bar 7 can be within the range of 8-16 mm.

[0042] For the connection position of the precast main beam 1 and the precast secondary beam 2 where the stress is relatively small, the setting of the embedded anchor plate 6 and the anchor plate reinforcement 7 can be cancelled. At this time, the bottom short leg of the angle steel 4 is directly placed on the concrete.

[0043] A construction method for a building structure assembled concrete primary and secondary beam connection node is implemented based on a building structure assembled concrete primary and secondary beam connection node, comprising the following steps:

[0044] Step 1: fix the embedded anchor plate 6 with vertical welded anchor plate steel bars 7 in the prefabricated main beam 1 to ensure that its position is accurate;

[0045] Step 2: reserve a notch 3 of appropriate width at the junction of the prefabricated main beam 1 and the prefabricated secondary beam 2, so that the notches 3 on both sides are expanded outward by 10 mm each, which is convenient for subsequent installation;

[0046] Step 3: Place two angle steels 4 on the embedded anchor plate 6 and inside the prefabricated secondary beam 2, respectively, and ensure that the portion of the angle steel 4 located on the embedded anchor plate 6 does not exceed one quarter of its total length, so as to maintain sufficient torsional resistance;

[0047] Step 4: After all parts are assembled, concrete is poured inside the square steel pipe column so that the angle steel 4, the studs 5, the embedded anchor plate 6 and the anchor plate steel bars 7 work together with the concrete to form a solid integral node.

[0048] Working principle: two unequal-limb angle steels 4 are arranged in an inverted T shape, one end of the angle steel 4 is overlapped on the embedded anchor plate 6, and the other end is embedded in the precast secondary beam 2, and is tightly combined with the precast concrete in the precast secondary beam 2 through the studs 5 welded thereon to form a steel tube concrete structure, which enhances the integrity and bearing capacity of the node; during the construction process, the embedded anchor plate 6 with the vertical welded anchor plate steel bar 7 is first fixed in the precast main beam 1, and a notch 3 of appropriate width is reserved at the junction of the precast main beam 1 and the precast secondary beam 2, so that the notches 3 on both sides are expanded outward by 10 mm each, which is convenient for subsequent installation, and the two pieces of angle steel 4 are respectively placed on the embedded anchor plate 6 and inside the precast secondary beam 2, ensuring that the part of the angle steel 4 located on the embedded anchor plate 6 does not exceed one-fourth of its total length, so as to maintain sufficient torsional resistance, and finally, after all the components are assembled, concrete is poured inside the square steel tube column, so that the angle steel 4, studs 5, embedded anchor plate 6 and anchor plate steel bar 7 work together with concrete to form a solid integral node.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A prefabricated concrete primary and secondary beam connection node for a building structure, comprising a prefabricated primary beam (1) and a prefabricated secondary beam (2), characterized in that: A notch (3) is reserved at the intersection of the prefabricated main beam (1) and the prefabricated secondary beam (2); a pre-buried anchor plate (6) is provided inside the prefabricated main beam (1); an anchor plate steel bar (7) is welded to the pre-buried anchor plate (6); and the anchor plate steel bar (7) is arranged vertically; Connectors are symmetrically arranged on both sides of the notch (3), and each side of the connector is composed of two angle steels (4) arranged back to back. The angle steel (4) extends along the length direction of the prefabricated secondary beam (2), one end of the angle steel (4) is overlapped on the embedded anchor plate (6), and the other end of the angle steel (4) is located inside the prefabricated secondary beam (2). The angle steel (4) is an unequal limb structure, and a bolt (5) is welded on the side of the long limb back of the angle steel (4).

2. The building structure assembled concrete primary and secondary beam connection node according to claim 1, characterized in that: The portion of the angle steel (4) located on the embedded anchor plate (6) does not exceed one quarter of the overall extension length of the angle steel (4).

3. The building structure assembled concrete primary and secondary beam connection node according to claim 2, characterized in that: The single row of reinforcement bars of the prefabricated secondary beam (2) extends into the prefabricated main beam (1).

4. The building structure assembled concrete primary and secondary beam connection node according to claim 3, characterized in that: The bolts (5) are connected to the concrete poured into the prefabricated secondary beam (2), and the anchor plate steel bars (7) are connected to the concrete poured into the prefabricated main beam (1).

5. The building structure assembled concrete primary and secondary beam connection node according to claim 4, characterized in that: The embedded anchor plate (6) is a horizontally arranged rectangular plate, and the long side of the embedded anchor plate (6) extends along the length direction of the prefabricated main beam (1).

6. The building structure assembled concrete primary and secondary beam connection node according to claim 5, characterized in that: The longitudinal cross section formed by the two angle steels (4) is in an inverted T shape.

7. The building structure assembled concrete primary and secondary beam connection node according to claim 6, characterized in that: The notch (3) is provided with angle steels (4) on both sides thereof, each extending 10 mm in the width direction of the square steel pipe column.

8. The building structure assembled concrete primary and secondary beam connection node according to claim 7, characterized in that: The thickness of a single angle steel (4) is within the range of 6 to 10 mm, the thickness of the embedded anchor plate (6) is within the range of 6 to 15 mm, the diameter of the bolt (5) is within the range of M10 to M16, and the diameter of the anchor plate steel bar (7) is within the range of 8 to 16 mm.

9. The building structure assembled concrete primary and secondary beam connection node according to claim 8, characterized in that: The number of the studs (5) on each side of the angle steel (4) is not less than three.

10. A method for constructing a prefabricated concrete primary and secondary beam connection node of a building structure, which is implemented based on a prefabricated concrete primary and secondary beam connection node of a building structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: fix the embedded anchor plate (6) with vertically welded anchor plate steel bars (7) in the prefabricated main beam (1); Step 2: reserve a notch (3) of appropriate width at the junction of the prefabricated main beam (1) and the prefabricated secondary beam (2), so that the notches (3) on both sides extend outward by 10 mm each; Step 3: Place two angle steels (4) on the embedded anchor plate (6) and inside the prefabricated secondary beam (2) respectively, ensuring that the portion of the angle steel (4) located on the embedded anchor plate (6) does not exceed one quarter of its total length; Step 4: After all parts are assembled, concrete is poured inside the square steel pipe column, so that the angle steel (4), bolts (5), embedded anchor plates (6) and anchor plate steel bars (7) work together with the concrete to form a solid integral node.

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