Semi-steel connection beam column joint, prefabricated bracket assembly and support-free construction method

Abstract

The invention relates to the technical field of building construction, and particularly discloses a semi-steel connection beam column joint, a prefabricated bracket assembly and a support-free construction method. The beam-column joint comprises a column, a prefabricated beam and a prefabricated bracket assembly, longitudinal steel bars of the column are arranged at the four corners in a concentrated mode, the prefabricated bracket assembly penetrates through column steel bars through through holes and then is fixed, a support component and a disassembly-free baffle component are arranged, and the beam-column joint is formed through post-pouring; one end of each precast beam is placed on the support component, upper longitudinal steel bars of the precast beams are connected through end stress steel plates, and the end steel plates of all the precast beams are welded to the polygonal steel plate in the center of the joint. The support-free construction method comprises the steps of prefabricating the bracket assembly, manufacturing and installing the precast beams and the precast columns, laying and adjusting the precast beams, welding the polygonal steel plates, binding the stirrups in the node area and pouring concrete. The steel plates replace hogging moment steel bars in a beam-column joint area, the construction procedures are greatly simplified through steel plate connection and prefabricated beam-slab support-free installation, the construction efficiency is improved, the construction cost is reduced, and meanwhile the excellent anti-seismic performance is achieved. The corbel and the column are prefabricated in a split mode, so that production and transportation efficiency is improved, the formwork and support working procedures are thoroughly omitted, and building efficiency and construction safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and relates to a semi-steel connecting beam-column node, a prefabricated corbel assembly and a support-free construction method. Background Art

[0002] In conventional prefabricated concrete structures, conventional connection nodes between precast beams and precast columns are generally cast in a reserved node area, where precast beams and precast columns need to extend the stress-bearing steel bars and anchor them in the post-cast node area to ensure the stress-bearing performance of the node. This structure has reliable force transmission, but there are obvious pain points. First of all, the collision of steel bars in the node area has caused difficulties in construction and installation, which has become a major pain point in the industry. The stress-bearing steel bars at the lower end of the beam in the node area can be minimized according to the design specifications to reduce the number of steel bars extending into the support, but the negative bending moment stress-bearing steel bars at the upper end of the beam are difficult to reduce. There are still a large number of steel bars on the construction site, such as large number, large diameter, and dense arrangement, which makes the installation of steel bars extremely difficult and the quality of concrete pouring is difficult to ensure. In addition, in conventional practices, the installation and disassembly procedures of the formwork and brackets in the node area are very cumbersome, especially in projects with large floor heights and large spans, and there are also high construction safety hazards. Summary of the invention

[0003] In view of this, the object of the present invention is to solve the above-mentioned problems and to provide a semi-steel connecting beam-column node, a prefabricated corbel assembly and a support-free construction method.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A prefabricated corbel assembly for beam-column node connection, comprising a corbel assembly, a non-disassembly baffle component, and a support component; the corbel assembly is provided with four through holes, and the four through holes are respectively used for the longitudinal steel bars at the four corners of the column to pass through; the four through holes are all located on the inner side of the non-disassembly baffle component; one or more sides of the corbel assembly are provided with a raised support component, which serves as a support for the prefabricated beam; the non-disassembly baffle component is L-shaped and fixedly arranged between two adjacent support components; each support component and the non-disassembly baffle components on both sides thereof jointly form a U-shaped notch for placing the prefabricated beam; all the non-disassembly baffle components surround the post-casting area of ​​the beam-column node.

[0006] Furthermore, the horizontal plane projection of the corbel assembly is polygonal, the corbel assembly is made of concrete, stress-bearing steel bars are arranged inside, and a rough surface is provided at the bottom of the corbel assembly.

[0007] Furthermore, the non-disassembly baffle component is made of concrete or cement fiber, and stress-bearing steel bars are arranged inside the non-disassembly baffle component. The stress-bearing steel bars extend from the upper and lower ends of the non-disassembly baffle component respectively for anchoring connection.

[0008] Furthermore, the prefabricated corbel assembly is an integrated prefabricated structure or a split assembled connection structure.

[0009] A semi-steel beam-column connection node comprises a column, a prefabricated beam and the prefabricated corbel assembly for beam-column node connection as described above; the longitudinal steel bars of the column are concentratedly arranged at four corners, the prefabricated corbel assembly is arranged at the upper end of the column, and the longitudinal steel bars of the column pass through four through holes on the corbel assembly; the prefabricated beam is respectively located at four sides of the column, and one end is placed on the support component of the prefabricated corbel assembly; the non-disassembly baffle components of the prefabricated corbel assembly are located on both sides of the prefabricated beam, and all the non-disassembly baffle components and the prefabricated beam surround a post-casting area in the middle;

[0010] The upper longitudinal reinforcement of the precast beam is welded to an end stress-bearing steel plate in the end area of ​​the beam, and the lower longitudinal reinforcement of the precast beam extends out of the concrete interface at the end of the beam and is anchored in the post-casting area; the end stress-bearing steel plates of all precast beams are welded and connected by a polygonal steel plate located at the center of the node.

[0011] Furthermore, the column is a prefabricated column or a cast-in-place column, the longitudinal reinforcement of the column extends out of the column top section and exceeds the prefabricated floor slab elevation of the layer, a rectangular groove is provided on the column top, and the horizontal plane projection of the rectangular groove overlaps with the horizontal plane projection of the four through holes on the corbel assembly to ensure the fluidity of concrete pouring.

[0012] Furthermore, the end stress-bearing steel plate of the prefabricated beam is rectangular, and the length of the extended beam end is the thickness of the concrete protective layer of the column, so that the stirrups in the beam-column node area can be installed smoothly.

[0013] Furthermore, a shear keyway is provided at the concrete interface at the beam end of the precast beam.

[0014] A support-free construction method for the semi-steel beam-column joint based on the above-mentioned method comprises the following steps:

[0015] (1) Prefabricated corbel assemblies and prefabricated beams are manufactured in the factory. When the columns are prefabricated, the prefabricated columns are manufactured in the factory and first hoisted into place before the prefabricated corbel assemblies are hoisted. When the columns are cast in situ, the curing columns are first cast in situ and reach the designed strength before the prefabricated corbel assemblies are hoisted. When hoisting the prefabricated corbel assemblies, the four through holes of the prefabricated corbel assemblies are passed through the longitudinal reinforcement of the column, and after adjusting them in place, concrete is poured to fill the through holes.

[0016] When the prefabricated corbel assembly is manufactured, a mold-integrated molding casting method is adopted, or the support component and the non-disassembly baffle component are manufactured first, and when the concrete of the corbel assembly is cast, the extended steel bars of the support component and the non-disassembly baffle component are inserted into the upper surface of the corbel assembly and fixed, and finally the prefabricated corbel assembly is formed, or the support component, the non-disassembly baffle component and the corbel assembly are manufactured separately, at which time the small-diameter stress-bearing steel bars of the support component and the non-disassembly baffle component may not extend out of the lower end section, and then the various components are assembled and fixed by using external anchor connectors, and finally the prefabricated corbel assembly is formed;

[0017] (2) hoist the prefabricated beam and place the end of the beam on the prefabricated bracket assembly and adjust it into place;

[0018] (3) Lifting and tying stirrups at beam-column joints;

[0019] (4) Use a polygonal steel plate to weld the beam end load-bearing steel plates on the prefabricated beams placed on the four sides of the column;

[0020] (5) Hoist the prefabricated floor slabs, use the non-removal baffle components as the template for the post-cast concrete in the node area, and pour the node concrete of this layer;

[0021] (6) When the columns are prefabricated, the prefabricated columns of the previous layer are hoisted. When the columns are cast-in-place, the longitudinal reinforcement of the columns of the previous layer is installed. Then, the longitudinal reinforcement of the upper and lower columns is quickly connected by grouting sleeves or mechanical sleeves.

[0022] Furthermore, the longitudinal reinforcement in the lower part of the precast beam needs to be arranged in a refined manner to avoid collision when extending into the beam-column node area.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention eliminates the upper steel bars of the negative bending moment at the beam end in the beam-column node area and makes reliable connection through steel plates, which greatly simplifies the construction and installation process. At the same time, the present invention strictly limits the amount of steel plates, that is, only the connecting force-bearing steel plates are arranged on the upper part of the negative bending moment at the beam end. At the same time, the longitudinal steel bars in the column and the lower longitudinal steel bars at the beam end are rationally optimized, which can reduce the cost investment as much as possible while ensuring the efficiency of on-site construction.

[0025] 2. The present invention has excellent structural seismic performance, and the seismic performance of the node method using steel plates for reliable connection is better than that of the traditional method. In addition, the steel plates are finally coated in concrete, eliminating the need for fire prevention and anti-corrosion measures, and the economic efficiency is better than that of traditional steel structure connection nodes.

[0026] 3. The present invention solves the problem of production and transportation difficulties of prefabricated columns with corbels. The prefabricated corbel components and prefabricated columns are prefabricated separately, which can greatly improve the factory production efficiency and improve the transportation efficiency of components. The present invention completely eliminates the template and bracket processes in traditional practices, greatly improves the construction efficiency, and reduces construction safety hazards.

[0027] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 It is an overall stereogram of the semi-steel connection beam-column node in the present invention.

[0030] Figure 2 It is a structural schematic diagram of the prefabricated corbel assembly in the present invention.

[0031] Figure 3 for Figure 2 Exploded view of the prefabricated corbel assembly.

[0032] Figure 4 Another structural schematic diagram of the prefabricated corbel assembly of the present invention.

[0033] Figure 5 for Figure 4 Exploded view of the prefabricated corbel assembly.

[0034] Figure 6 A schematic diagram of the structure of the column of the present invention.

[0035] Figure 7 It is a schematic diagram of the prefabricated corbel assembly of the present invention being installed on a column.

[0036] Figure 8 It is a schematic diagram of the structure of the prefabricated beam in the present invention.

[0037] Fig. 9 , 10 11 is a schematic diagram of the construction process of the beam-column node in the present invention.

[0038] Attached icons: 1-column; 2-precast beam; 3-precast corbel assembly; 4-polygonal steel plate; 5-floor slab; 6-stirrups; 21-end load-bearing steel plate; 22-lower longitudinal reinforcement; 23-shear keyway; 31-corbel assembly; 32-support component; 33-non-removal baffle component. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0040] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and descriptions in the drawings may be omitted.

[0041] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] See also Figures 1 to 11 , is a prefabricated corbel assembly for beam-column node connection, comprising a corbel assembly 31, a non-disassembly baffle component 33, and a support component 32; the corbel assembly 31 is provided with 4 through holes, and the 4 through holes are respectively used for the longitudinal steel bars at the four corners of the column to pass through; the 4 through holes are all located on the inner side of the non-disassembly baffle component 33; raised support components 32 are provided on the four sides of the corbel assembly 31 as a support for the prefabricated beam 2; the non-disassembly baffle component 33 is L-shaped and fixedly arranged between two adjacent support components 32; each support component 32 and the non-disassembly baffle components 33 on both sides thereof jointly form a U-shaped notch for placing the prefabricated beam 2; all the non-disassembly baffle components 33 surround the post-casting area of ​​the beam-column node.

[0043] The plane projection of the corbel assembly 31 is polygonal, the corbel assembly 31 is made of concrete, and stress-bearing steel bars are arranged inside it. The bottom of the corbel assembly 31 is provided with a rough surface. The non-disassembly baffle component 33 is made of concrete or cement fiber, and stress-bearing steel bars are arranged inside the non-disassembly baffle component 33. The stress-bearing steel bars extend from the upper and lower ends of the non-disassembly baffle component 33 respectively for anchoring connection.

[0044] The prefabricated corbel assembly 3 is an integrated prefabricated structure or a split assembly connection structure.

[0045] A semi-steel beam-column connection node comprises a column 1, a precast beam 2 and a precast corbel assembly 3 as described above; the longitudinal steel bars of the column 1 are concentratedly arranged at four corners, the precast corbel assembly 3 is arranged at the upper end of the column 1, and the longitudinal steel bars of the column 1 pass through four through holes on the corbel assembly 31; the precast beam 2 is respectively located at four sides of the column 1, and one end is placed on a support component 32 of the precast corbel assembly 3; the non-disassembly baffle components 33 of the precast corbel assembly 3 are located on both sides of the precast beam 2, and all the non-disassembly baffle components 33 and the precast beam 2 surround a post-casting area in the middle;

[0046] The upper longitudinal reinforcement of the precast beam 2 is welded to an end stress-bearing steel plate 21 in the end area of ​​the beam, and the lower longitudinal reinforcement 22 of the precast beam 2 extends out of the concrete interface at the end of the beam and is anchored in the post-casting area; the end stress-bearing steel plates 21 of all precast beams 2 are welded and connected by a polygonal steel plate 4.

[0047] Column 1 is a prefabricated column or a cast-in-place column. The longitudinal reinforcement of column 1 extends out of the top section of column 1 and exceeds the elevation of the prefabricated floor slab 5 of this layer. A rectangular groove is provided on the top of column 1. The horizontal plane projection of the rectangular groove overlaps with the horizontal plane projection of the four through holes on the corbel assembly 31 to ensure the fluidity of concrete pouring.

[0048] The end bearing steel plate 21 of the precast beam 2 is rectangular, and its length at the beam end is the thickness of the concrete protective layer of the column 1, so that the stirrups 6 in the beam-column node area can be smoothly installed. The concrete interface of the beam end of the precast beam 2 is provided with a shear keyway 23.

[0049] A support-free construction method for the semi-steel beam-column joint based on the above-mentioned method comprises the following steps:

[0050] (1) Prefabricated corbel assembly 3 and prefabricated beam 2 are manufactured in the factory. When the column 1 is a prefabricated column, the prefabricated column is manufactured in the factory and first hoisted in place before the prefabricated corbel assembly 3 is hoisted. When the column 1 is cast in situ, the curing column is first cast in situ and reaches the design strength before the prefabricated corbel assembly 3 is hoisted. When hoisting the prefabricated corbel assembly 3, the four through holes of the prefabricated corbel assembly 3 are passed through the longitudinal reinforcement of the column 1, and after adjusting in place, concrete is poured to fill the through holes.

[0051] When the prefabricated corbel assembly 3 is manufactured, a mold-integrated molding casting method is adopted, or the support component 32 and the non-disassembly baffle component 33 are manufactured first, and when the concrete of the corbel assembly 31 is cast, the extended steel bars of the support component 32 and the non-disassembly baffle component 33 are inserted into the upper surface of the corbel assembly 31 and fixed, and finally the prefabricated corbel assembly 3 is formed, or the support component 32, the non-disassembly baffle component 33 and the corbel assembly 31 are manufactured separately, at this time, the small-diameter stress-bearing steel bars of the support component 32 and the non-disassembly baffle component 33 may not extend out of the lower end section, and then the external anchor connector is used to assemble and fix the various components, and finally the prefabricated corbel assembly 3 is formed;

[0052] (2) hoisting the prefabricated beam 2 and placing the end of the beam on the prefabricated corbel assembly 3 and adjusting it into position;

[0053] (3) Install and tie stirrups 6 in the beam-column joint area;

[0054] (4) A polygonal steel plate 4 is used to weld the beam end bearing steel plates on the prefabricated beams 2 placed on the four sides of the column 1;

[0055] (5) hoisting the prefabricated floor slab 5, using the non-dismantling baffle plate component 33 as a template for pouring concrete in the node area, and pouring the node concrete of this layer;

[0056] (6) When column 1 is a prefabricated column, the prefabricated column of the previous layer is hoisted; when column 1 is cast-in-place, the longitudinal reinforcement of the column of the previous layer is installed, and then the longitudinal reinforcement of the upper and lower columns is quickly connected by grouting sleeves or mechanical sleeves.

[0057] During the construction process, the longitudinal reinforcement 22 at the lower part of the precast beam 2 needs to be carefully arranged to avoid collision when extending into the beam-column node area.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A prefabricated corbel assembly for beam-column node connection, characterized in that: It includes a corbel assembly, a non-disassembly baffle assembly, and a support assembly; the corbel assembly is provided with 4 through holes, which are respectively used for the longitudinal steel bars at the four corners of the column to pass through; the 4 through holes are all located on the inner side of the non-disassembly baffle assembly; one or more sides of the corbel assembly are provided with a raised support assembly as a support for the precast beam; the non-disassembly baffle assembly is L-shaped and fixed between two adjacent support assemblies; each support assembly and the non-disassembly baffle assembly on both sides thereof jointly form a U-shaped notch for placing the precast beam; all the non-disassembly baffle assembly components surround the post-casting area of ​​the beam-column node.

2. The prefabricated corbel assembly for beam-column node connection according to claim 1, characterized in that: The horizontal plane projection of the corbel assembly is polygonal. The corbel assembly is made of concrete, and stress-bearing steel bars are arranged inside the corbel assembly. A rough surface is arranged at the bottom of the corbel assembly.

3. The prefabricated corbel assembly for beam-column node connection according to claim 1, characterized in that: The non-disassembly baffle component is made of concrete or cement fiber, and stress-bearing steel bars are arranged therein. The stress-bearing steel bars extend from the upper and lower ends of the non-disassembly baffle component respectively for anchoring connection.

4. The prefabricated corbel assembly for beam-column node connection according to claim 1, characterized in that: The prefabricated corbel assembly is an integrated prefabricated structure or a split assembled connection structure.

5. A semi-steel beam-column connection node, characterized in that: The invention comprises a column, a prefabricated beam and a prefabricated corbel assembly for beam-column node connection as claimed in any one of claims 1 to 4; the longitudinal reinforcements of the column are concentratedly arranged at four corners, the prefabricated corbel assembly is arranged at the upper end of the column, and the longitudinal reinforcements of the column pass through four through holes on the corbel assembly; the prefabricated beam is respectively located on four sides of the column, and one end is placed on the support component of the prefabricated corbel assembly; the non-disassembly baffle components of the prefabricated corbel assembly are located on both sides of the prefabricated beam, and all the non-disassembly baffle components and the prefabricated beam surround the middle post-casting area; The upper longitudinal reinforcement of the precast beam is welded to an end stress-bearing steel plate in the end area of ​​the beam, and the lower longitudinal reinforcement of the precast beam extends out of the concrete interface at the end of the beam and is anchored in the post-casting area; the end stress-bearing steel plates of all precast beams are welded and connected by a polygonal steel plate located in the center.

6. The semi-steel beam-column connection node according to claim 5, characterized in that: The column is a prefabricated column or a cast-in-place column. The longitudinal reinforcement of the column extends out of the column top section and exceeds the prefabricated floor slab elevation of the layer. A rectangular groove is provided on the column top. The horizontal plane projection of the rectangular groove overlaps with the horizontal plane projection of the four through holes on the corbel assembly.

7. The semi-steel beam-column connection node according to claim 5, characterized in that: The stress-bearing steel plate at the end of the prefabricated beam is rectangular, and the length of the steel plate at the end of the beam is the thickness of the concrete protective layer of the column.

8. The semi-steel beam-column connection node according to claim 5, characterized in that: The concrete interface at the beam end of the precast beam is provided with a shear keyway.

9. A support-free construction method for a semi-steel beam-column connection node according to any one of claims 5 to 7, characterized in that: The steps include: (1) Prefabricated corbel assemblies and prefabricated beams are manufactured in the factory. When the columns are prefabricated, the prefabricated columns are manufactured in the factory and first hoisted into place before the prefabricated corbel assemblies are hoisted. When the columns are cast in situ, the curing columns are first cast in situ and reach the designed strength before the prefabricated corbel assemblies are hoisted. When hoisting the prefabricated corbel assemblies, the four through holes of the prefabricated corbel assemblies are passed through the longitudinal reinforcement of the column, and after adjusting them in place, concrete is poured to fill the through holes. When the prefabricated corbel assembly is manufactured, a mold-integrated molding casting method is adopted, or the support components and the non-disassembly baffle components are manufactured first, and when the concrete of the corbel assembly is cast, the protruding steel bars of the support components and the non-disassembly baffle components are inserted into the upper surface of the corbel assembly and fixed, and finally the prefabricated corbel assembly is formed, or the support components, the non-disassembly baffle components, and the corbel assembly are manufactured separately, and the components are assembled and fixed by external anchoring connectors, and finally the prefabricated corbel assembly is formed; (2) hoist the prefabricated beam and place the end of the beam on the prefabricated bracket assembly and adjust it into position; (3) Lifting and tying stirrups at beam-column joints; (4) Use a polygonal steel plate to weld the beam end load-bearing steel plates on the prefabricated beams placed on the four sides of the column; (5) Hoist the prefabricated floor slabs, use the non-removal baffle components as the template for the post-cast concrete in the node area, and pour the node concrete of this layer; (6) When the columns are prefabricated, the prefabricated columns of the previous layer are hoisted. When the columns are cast-in-place, the longitudinal reinforcement of the columns of the previous layer is installed. Then, the longitudinal reinforcement of the upper and lower columns is quickly connected by grouting sleeves or mechanical sleeves.

10. The support-free construction method according to claim 9, characterized in that: The longitudinal reinforcement in the lower part of the precast beam needs to be carefully arranged to avoid collision when extending into the beam-column node area.

Images