A support-free prefabricated structure based on superimposed parent-child beams and its installation method

Abstract

The present invention is a support-free prefabricated structure based on superimposed mother-and-child beams and its installation method. The support-free prefabricated structure includes columns, prefabricated main beams and prefabricated mother-and-child beams. The middle part of the prefabricated mother-and-child beams is provided with a section where beam stirrups are not arranged and concrete is not poured, so that the prefabricated mother-and-child beams are divided into a mother beam located inside the building and a sub-beam cantilevered outside the building; a pair of connecting steel plates are arranged vertically and the two ends are respectively connected to the mother beam closed hoop provided in the mother beam and the sub-beam closed hoop provided in the sub-beam; the prefabricated main beam is erected between any two adjacent columns on the left and right; the mother beam of the prefabricated mother-and-child beam is erected between any two adjacent columns in front and behind, so that the sub-beam extends outward to form a cantilever beam. The installation method comprises the following steps: completing the arrangement of the columns, successively hoisting the prefabricated main beams and prefabricated mother-and-child beams in place, and then successively completing the arrangement of the main beam reinforcement and the secondary beam reinforcement. The beneficial effects of the present invention are to realize the support-free and formwork-free construction of the building structure with cantilever beams, shortening the construction period of this type of building.

Description

Technical Field

[0001] The invention relates to an assembled building structure, in particular to a support-free prefabricated structure based on superimposed parent and child beams and an installation method thereof. Background Art

[0002] The existing prefabricated and assembled support-free floor system cannot be support-free when it comes to cantilever beam structures. The main reason is that there is no corresponding support point at the far end of the cantilever beam. Therefore, when the support-free floor system involves cantilever beams, it is necessary to set support members under the cantilever beams. The support members can only be removed after the near end of the cantilever beam is cast into one with the beam-column node. Since the formwork and support system need to be set up on site, the overall construction period is extended. Summary of the invention

[0003] The purpose of the present invention is to provide a support-free prefabricated structure based on superimposed parent-child beams and an installation method thereof, which realizes the support-free and formwork-free construction of a building structure with cantilever beams and shortens the construction period of this type of building.

[0004] The present invention is implemented by the following technical scheme: a prefabricated structure without support based on superimposed parent-child beams and an installation method thereof, comprising:

[0005] The column has steel corbels on the sides of the top of the column and column reinforcements extending upwards are provided at the four corners of the top surface of the column;

[0006] The prefabricated main beam is a reinforced concrete structure formed by pouring concrete on the main beam bottom reinforcement and a plurality of main beam stirrups; the plurality of main beam stirrups are divided into a plurality of main beam open stirrups arranged in sequence in the middle and a small number of main beam closed stirrups arranged in sequence at both ends; the main beam bottom reinforcement is connected to the bottom of the main beam open stirrup and the main beam closed stirrup; the upper parts of the main beam open stirrup and the main beam closed stirrup extend out of the top surface of the prefabricated main beam, and the two ends of the main beam bottom reinforcement extend out of the end of the prefabricated main beam and bend upward;

[0007] Prefabricated mother-and-child beams are reinforced concrete structures formed by pouring concrete with beam bottom reinforcement, beam stirrups and connecting steel plates; a section of the middle of the prefabricated mother-and-child beam is provided where beam stirrups are not laid and concrete is not poured, so that the prefabricated mother-and-child beams are divided into a mother beam located inside the building and a sub-beam cantilevered outside the building;

[0008] The beam stirrups in the mother beam are divided into a number of mother beam open stirrups arranged in sequence in the middle part and a small number of mother beam closed stirrups arranged in sequence at both ends. The beam bottom reinforcement is connected to the bottom of the mother beam open stirrup and the mother beam closed stirrup, and the upper parts of the mother beam open stirrup and the mother beam closed stirrup extend out of the mother beam top surface; the beam stirrups in the sub-beam are divided into a number of sub-beam open stirrups arranged in sequence and a small number of sub-beam closed stirrups arranged in sequence near one side of the mother beam. The beam bottom reinforcement in the mother beam extends into the sub-beam and is connected to the bottom of the sub-beam open stirrup and the sub-beam closed stirrup, and the upper parts of the sub-beam open stirrup and the sub-beam closed stirrup extend out of the sub-beam top surface; a pair of connecting steel plates are vertically arranged and the two ends are respectively connected to the sides of a plurality of mother beam closed stirrups and sub-beam closed stirrups, and the upper parts of the connecting steel plates extend out of the mother beam top surface and the sub-beam top surface;

[0009] The prefabricated main beam is erected on the steel corbels between any two adjacent left and right columns; the mother beam of the prefabricated mother-child beam is erected on the steel corbels between any two adjacent front and rear columns, so that the child beam extends outward to form a cantilever beam; the main beam surface reinforcement passing through the columns is arranged on the prefabricated main beam, and then the mother-child beam surface reinforcement passing through the columns is arranged on the prefabricated mother-child beam.

[0010] A method for installing a brace-free prefabricated structure based on superimposed parent-child beams comprises the following steps:

[0011] S1, arranging the columns in an array;

[0012] S2, hoisting the prefabricated main beam; setting the prefabricated main beam on the steel brackets of any two adjacent columns on the left and right;

[0013] S3, erecting the mother beam of the prefabricated mother-child beam on the steel bracket between any two adjacent front and rear columns, and ensuring that the inner end of the sub-beam extending outward to form a cantilever beam is placed on the steel bracket of the column;

[0014] S4, complete the layout of the main beam reinforcement, and ensure that the main beam reinforcement passes through the main beam stirrups and columns;

[0015] S5, complete the layout of the mother-child beam surface reinforcement, and ensure that the mother-child beam surface reinforcement passes through the stirrups on the mother beam, the column and the stirrups on the child beam.

[0016] Compared with the previous technology, the beneficial effects of the present invention are:

[0017] 1. Prefabricated mother-child beams are formed by integrally casting the child beam as a cantilever beam and the mother beam located inside the building. The adjacent parts of the two are equipped with closed hoops and welded to the closed hoops through connecting steel plates. In addition, the upper part of the connecting steel plate extends out of the top surface of the mother beam and the top surface of the child beam, so that the connecting steel plate is placed at a higher position, and a sufficiently large force arm is formed between the bottom reinforcement of the beam and the connecting steel plate, which finally realizes the support-free construction when the child beam is used as a cantilever beam.

[0018] 2. The connecting steel plate partly extends out of the top surface of the mother beam and the top surface of the sub-beam, and the mother beam closing hoop extending out of the top surface of the mother beam and the sub-beam closing hoop extending out of the top surface of the sub-beam are added. The mother beam closing hoop and the sub-beam closing hoop are fixed on the surface of the connecting steel plate to form a rough concave and convex surface, thereby ensuring the reliability of the connection between the precast concrete and the connecting steel plate.

[0019] 3. In addition, the sub-beam closing hoop, the mother beam closing hoop and the connecting steel plate are welded into one piece to form an integral component, which is convenient for positioning during the production process of prefabricated sub-beam and mother beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the prefabricated mother-child beam of the present invention;

[0021] Figure 2 for Figure 1 perspective drawing;

[0022] Figure 3 This is a schematic diagram of the S1 center column after installation;

[0023] Figure 4 This is a schematic diagram of the prefabricated main beam in S2 after hoisting;

[0024] Figure 5 This is a schematic diagram of the prefabricated mother-child beam in S3 after hoisting;

[0025] Figure 6 This is the schematic diagram of S4 after the main beam reinforcement is arranged;

[0026] Figure 7 This is a schematic diagram of S5 after the reinforcement arrangement of the beam is completed.

[0027] Explanation of numbers: 1 column, 11 steel corbel, 12 column reinforcement, 2 precast main beam, 21 main beam bottom reinforcement, 22 main beam open hoop, 23 main beam closed hoop, 3 precast sub-beam, 31 beam bottom reinforcement, 32 connecting steel plate, 33 mother beam open hoop, 34 mother beam closed hoop, 35 sub-beam open hoop, 36 sub-beam closed hoop, 38 mother beam, 39 sub-beam, 41 main beam surface reinforcement, 42 mother-beam surface reinforcement, 5 keyway. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings:

[0029] like Figure 1-7 As shown: A prefabricated structure without support based on superimposed parent-child beams and its installation method, comprising:

[0030] A column 1, a steel corbel 11 is provided on the side of the top of the column 1 and column reinforcement bars 12 extending upward are provided at the four corners of the top surface of the column 1;

[0031] The prefabricated main beam 2 is a reinforced concrete structure formed by pouring concrete through a main beam bottom reinforcement 21 and a plurality of main beam stirrups; the plurality of main beam stirrups are divided into a plurality of main beam open stirrups 22 arranged in sequence in the middle and a small number of main beam closed stirrups 23 arranged in sequence at both ends; the main beam bottom reinforcement 21 is connected to the bottom of the main beam open stirrup 22 and the main beam closed stirrup 23; the upper parts of the main beam open stirrup 22 and the main beam closed stirrup 23 extend out of the top surface of the prefabricated main beam 2, and the two ends of the main beam bottom reinforcement 21 extend out of the end of the prefabricated main beam 2 and bend upward;

[0032] The prefabricated mother-and-child beam 3 is a reinforced concrete structure formed by pouring concrete with beam bottom reinforcement 31, beam stirrups and connecting steel plates 32; a section of the middle of the prefabricated mother-and-child beam 3 is provided without beam stirrups and without pouring concrete, so that the prefabricated mother-and-child beam 3 is divided into a mother beam 38 located inside the building and a sub-beam 39 cantilevered outside the building;

[0033] The beam stirrups in the mother beam 38 are divided into a plurality of mother beam open stirrups 33 arranged in sequence in the middle part and a small number of mother beam closed stirrups 34 arranged in sequence at both ends. The beam bottom reinforcement 31 is connected to the bottom of the mother beam open stirrup 33 and the mother beam closed stirrup 34, and the upper parts of the mother beam open stirrup 33 and the mother beam closed stirrup 34 extend out of the top surface of the mother beam 38; the beam stirrups in the sub-beam 39 are divided into a plurality of sub-beam open stirrups 35 arranged in sequence and a small number of sub-beam closed stirrups 36 arranged in sequence near one side of the mother beam 38. The beam bottom reinforcement 31 in the mother beam 38 extends into the sub-beam 39 and is connected to the bottom of the sub-beam open stirrup 35 and the sub-beam closed stirrup 36, and the upper parts of the sub-beam open stirrup 35 and the sub-beam closed stirrup 36 extend out of the top surface of the sub-beam 39; a pair of connecting steel plates 32 are vertically arranged and the sides of the plurality of mother beam closed stirrups 34 and the sub-beam closed stirrup 36 are respectively connected at both ends, and the upper parts of the connecting steel plates 32 extend out of the top surfaces of the mother beam 38 and the sub-beam 39;

[0034] The prefabricated main beam 2 is erected on the steel corbel 11 between any two adjacent left and right columns 1; the main beam 38 of the prefabricated mother-and-child beam 3 is erected on the steel corbel 11 between any two adjacent front and rear columns 1, so that the sub-beam 39 extends outward to form a cantilever beam; the main beam surface reinforcement 41 passing through the column 1 is arranged on the prefabricated main beam 2, and then the mother-and-child beam surface reinforcement 42 passing through the column 1 is arranged on the prefabricated mother-and-child beam 3.

[0035] The above has completed the main structure after the installation of the prefabricated mother-child beam. In the future, it is only necessary to lay out the prefabricated composite plate in the area enclosed by the prefabricated main beam and the mother beam, and also lay out the prefabricated composite plate between two adjacent sub-beams, and finally pour the surface concrete. When pouring concrete, since the mother beam closed hoop and the sub-beam closed hoop are welded to the connecting steel plate, the surface of the connecting steel plate forms a rough surface, thereby improving the connection strength between the connecting steel plate and the cast-in-place concrete.

[0036] The end face of the precast main beam 2, the end face of the mother beam 38 and the inner end face of the sub-beam 39 are all provided with a keyway 5. The keyway 5 is also provided to ensure the connection strength between the end faces of the precast main beam 2, the mother beam 38 and the sub-beam 39 and the cast-in-place concrete. The keyway itself is a conventional technology, so it will not be elaborated.

[0037] The beam bottom reinforcement 31 is located in the area where concrete is not poured and is in an upwardly bent arc shape to avoid the main beam bottom reinforcement 21. The bending arc here does not need to be too large, as long as it can ensure that there is no spatial interference between the main beam bottom reinforcement 21 and the beam bottom reinforcement 31.

[0038] like Figure 3-7 As shown: A method for installing a brace-free prefabricated structure based on superimposed parent-child beams, comprising the following steps:

[0039] S1, arranging the columns 1 in an array;

[0040] S2, hoisting the prefabricated main beam 2; setting the prefabricated main beam on the steel brackets 11 of any two adjacent columns 1;

[0041] S3, erecting the mother beam 38 of the prefabricated mother-child beam 3 on the steel corbel 11 between any two adjacent front and rear columns 1, and ensuring that the inner end of the sub-beam 39 extending outward as a cantilever beam is placed on the steel corbel 11 of the column 1;

[0042] S4, complete the layout of the main beam reinforcement 41, and ensure that the main beam reinforcement 41 passes through the main beam stirrups and the column 1;

[0043] S5, complete the layout of the mother-child beam reinforcement 42, and ensure that the mother-child beam reinforcement 42 passes through the beam stirrups on the mother beam 38, the column 1 and the beam stirrups on the child beam 39.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated structure without support based on superimposed parent-child beams, characterized in that: include A column (1), wherein a steel corbel (11) is provided on the side of the top of the column (1) and column reinforcement bars (12) extending upward are provided at the four corners of the top surface of the column (1); The prefabricated main beam (2) is a reinforced concrete structure formed by pouring concrete on a main beam bottom reinforcement (21) and a plurality of main beam stirrups; the plurality of main beam stirrups are divided into a plurality of main beam open stirrups (22) arranged in sequence in the middle and a small number of main beam closed stirrups (23) arranged in sequence at both ends; the main beam bottom reinforcement (21) is connected to the bottom of the main beam open stirrup (22) and the main beam closed stirrup (23); the upper parts of the main beam open stirrup (22) and the main beam closed stirrup (23) extend out of the top surface of the prefabricated main beam (2), and the two ends of the main beam bottom reinforcement (21) extend out of the end of the prefabricated main beam (2) and bend upward; The prefabricated mother-and-child beam (3) is a reinforced concrete structure formed by pouring concrete through beam bottom reinforcement (31), beam stirrups and connecting steel plates (32); a section in the middle of the prefabricated mother-and-child beam (3) where beam stirrups are not arranged and concrete is not poured is provided, so that the prefabricated mother-and-child beam (3) is divided into a mother beam (38) located inside the building and a sub-beam (39) cantilevered outside the building; The beam stirrups in the mother beam (38) are divided into a plurality of mother beam open stirrups (33) arranged in sequence in the middle and a small number of mother beam closed stirrups (34) arranged in sequence at both ends; the beam bottom reinforcement (31) is connected to the bottom of the mother beam open stirrup (33) and the mother beam closed stirrup (34); the upper parts of the mother beam open stirrup (33) and the mother beam closed stirrup (34) extend out of the top surface of the mother beam (38); the beam stirrups in the sub-beam (39) are divided into a plurality of sub-beam open stirrups (35) arranged in sequence and a small number of sub-beam closed stirrups arranged in sequence on one side close to the mother beam (38). (36), the beam bottom reinforcement (31) in the mother beam (38) extends into the sub-beam (39) and is connected to the bottom of the sub-beam open hoop (35) and the sub-beam closed hoop (36), and the upper parts of the sub-beam open hoop (35) and the sub-beam closed hoop (36) extend out of the top surface of the sub-beam (39); a pair of connecting steel plates (32) are vertically arranged and the two ends are respectively connected to the side surfaces of the plurality of mother beam closed hoops (34) and the sub-beam closed hoops (36), and the upper parts of the connecting steel plates (32) extend out of the top surface of the mother beam (38) and the top surface of the sub-beam (39); The prefabricated main beam (2) is mounted on a steel corbel (11) between any two adjacent left and right columns (1); the main beam (38) of the prefabricated sub-beam (3) is mounted on a steel corbel (11) between any two adjacent front and rear columns (1), so that the sub-beam (39) extends outward to form a cantilever beam; main beam surface reinforcement (41) passing through the column (1) is arranged on the prefabricated main beam (2), and then sub-beam surface reinforcement (42) passing through the column (1) is arranged on the prefabricated sub-beam (3).

2. The brace-free prefabricated structure based on superimposed parent-child beams according to claim 1 is characterized in that: The end surface of the prefabricated main beam (2), the end surface of the mother beam (38) and the inner end surface of the sub-beam (39) are all provided with a keyway (5).

3. The support-free prefabricated structure based on superimposed parent-child beams according to claim 1 is characterized in that: The beam bottom reinforcement (31) is located in an area where concrete is not poured and is in an upwardly bent arc shape, so as to avoid the main beam bottom reinforcement (21).

4. A method for installing a prefabricated structure without support based on superimposed parent-child beams according to any one of claims 1 to 3, characterized in that: The steps include: S1, arranging the columns (1) in an array; S2, hoisting the prefabricated main beam (2); placing the prefabricated main beam (2) on the steel brackets (11) of any two adjacent columns (1); S3, erecting the mother beam (38) of the prefabricated mother-child beam (3) on the steel bracket (11) between any two adjacent front and rear columns (1), and ensuring that the inner end of the child beam (39) extending outward as a cantilever beam is placed on the steel bracket (11) of the column (1); S4, complete the layout of the main beam reinforcement (41), and ensure that the main beam reinforcement (41) passes through the main beam stirrups and the column (1); S5, completing the arrangement of the mother-and-child beam surface reinforcement (42), ensuring that the mother-and-child beam surface reinforcement (42) passes through the beam stirrups on the mother beam (38), the column (1) and the beam stirrups on the child beam (39).

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