Fabricated concrete frame beam-column dry connection node and connecting method thereof

Abstract

The application discloses an assembled concrete frame beam-column dry-type connecting joint, which comprises a prefabricated concrete hollow column and two steel sleeves for connecting beams, the two steel sleeves are symmetrically distributed and surround the prefabricated concrete hollow column, a locking assembly is locked and connected between the two steel sleeves, the locking assembly comprises an upper spring ring, a lower spring ring, a prestressed steel bar and a bolt and nut assembly; the steel sleeve comprises a steel ring plate, an assembly plate and a plurality of rib plates, the inner surface of the steel ring plate is in close abutment with the outer wall of the prefabricated concrete hollow column, the upper outer wall of the steel ring plate is provided with a first positioning groove for nesting the upper spring ring, the lower outer wall of the steel ring plate is provided with a second positioning groove for nesting the lower spring ring, the middle outer wall of the steel ring plate is provided with a prestressed steel bar channel for the corresponding penetration of the prestressed steel bar, and the assembly plate is provided with a connecting hole for assembling the bolt and nut assembly. The application can be flexibly adjusted and installed according to the position of the beam-column joint, has a simple structure, a high standardization degree and low construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated buildings, and in particular to a prefabricated concrete frame beam-column dry-type connecting joint and a connecting method thereof. BACKGROUND

[0002] In recent years, the prefabricated building field has developed vigorously, and the research and development achievements of prefabricated related technologies are numerous, but due to the fact that some key technologies have not been fundamentally broken through, the construction cost of prefabricated buildings is still higher than that of traditional buildings, and the standardization degree still needs to be improved, for example, frame walls, columns, beams and plates still need to be customized to produce prefabricated components according to different buildings. At present, the industry thinks that the high-strength concrete pipe pile has the characteristics of high standardization degree, low cost and high bearing capacity, and can be applied to the frame column of the upper structure to well solve the problem of low standardization degree of the frame column. However, the problem of standardization of the beam-column joint dry-type connection has not been well solved at present, and the dry-type connection at the present stage is mainly through the built-in steel plate of the frame column at the joint to connect with the beam to transfer the beam end bending moment and shear force, and the position of the steel plate on the frame column cannot be adjusted at will, which will greatly weaken the standardization degree of the frame column. SUMMARY

[0003] In order to overcome the above defects, the purpose of the present application is to provide a prefabricated concrete frame beam-column dry-type connecting joint and a connecting method thereof, according to the position of the preset beam-column joint, two standardized steel sleeves are fixed on the prefabricated concrete hollow column by surrounding, prestress is applied to the steel sleeve to provide sufficient friction and pressure between the steel sleeve and the prefabricated concrete hollow column, and then the vertical force can be borne, so that the bending moment of the beam to the prefabricated concrete hollow column can be borne, the structure is simple, the position can be adjusted at will, the standardization degree is higher, the construction cost is also low, and the problems of the beam-column dry-type connection in the prior art that cannot be adjusted at will and the low standardization degree are solved.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] In a first aspect, the present invention provides a prefabricated concrete frame beam-column dry connection node, comprising a precast concrete hollow column and two steel rings for connecting beams. The two steel rings are symmetrically distributed and enclose the precast concrete hollow column. A locking assembly is locked between the two steel rings. The locking assembly includes an upper spring ring, a lower spring ring, at least one prestressed steel bar, and several bolt and nut assemblies. The steel ring includes a steel ring plate with a semi-circular cross-section, assembly plates fixedly connected to both ends of the steel ring plate, and several ribs spaced apart along the outer wall of the steel ring plate. The inner surface of the steel ring plate is in close contact with the outer wall of the precast concrete hollow column. The upper outer wall of the steel ring plate is provided with a first positioning groove above the ribs for nesting the upper spring ring. The lower outer wall of the steel ring plate is provided with a second positioning groove below the ribs for nesting the lower spring ring. The middle outer wall of the steel ring plate is provided with a prestressed steel bar channel through which the prestressed steel bar passes. The assembly plate is provided with connecting holes for assembling the bolt and nut assemblies.

[0006] Furthermore, the prestressed steel bar channel includes a third positioning groove opened on the outer wall of the steel ring plate and a through hole penetrating the assembly plate and the rib plate.

[0007] Preferably, the first positioning groove, the second positioning groove, and the third positioning groove are parallel to each other in the horizontal direction. This facilitates the application of radial pressure to the steel ring plate by the upper spring coil, the lower spring coil, and each prestressed steel bar.

[0008] Preferably, the first positioning groove, the second positioning groove, and the third positioning groove are all rectangular grooves. This facilitates the precise positioning and fixing of the upper spring ring, the lower spring ring, and each prestressed steel bar onto the steel ring plate, preventing loosening and slippage.

[0009] Furthermore, the two assembly plates located at both ends of the steel ring plate are coplanarly distributed, and after the two steel rings enclose the precast concrete hollow column, a buffer gap is left between the two assembly plates locked together on the same side. This buffer gap facilitates the application of radial pressure to the steel ring plate using prestressed steel bars.

[0010] Preferably, the width of the buffer gap is not less than 20mm.

[0011] Furthermore, the ribs are evenly distributed along the outer wall of the steel ring plate and are perpendicular to the outer wall of the steel ring plate.

[0012] Furthermore, the top of each rib and the top of the assembly plate are connected to an upper ring plate, and the bottom of each rib and the bottom of the assembly plate are connected to a lower ring plate. The inner wall of the upper ring plate is fixedly connected to the outer wall of the steel ring plate, and the inner wall of the lower ring plate is fixedly connected to the outer wall of the steel ring plate. This improves the overall strength. In addition, the upper and lower ring plates can also be used to connect to beams.

[0013] Preferably, the thickness of the steel ring plate, the assembly plate, the rib plate, the upper ring plate, and the lower ring plate is not less than 20mm. This ensures sufficient structural strength of the steel ring.

[0014] Preferably, there are four prestressed steel bars and prestressed steel bar channels, evenly distributed along the outer wall of the steel ring; each assembly plate has eight connecting holes, arranged in four layers, with two connecting holes in each layer. This provides a sufficiently large locking force and radial pressure on the ring column.

[0015] Secondly, the present invention further provides a connection method for the above-mentioned dry connection node of prefabricated concrete frame beam and column, comprising the following steps:

[0016] S1. Pre-fabricate high-strength precast hollow concrete columns;

[0017] S2. Two steel rings are placed around the outer wall of the precast concrete hollow column at the beam-column joint.

[0018] S3. Use the first positioning groove set on the upper part of the steel sleeve to nest an upper spring ring, and use the second positioning groove set on the lower part of the steel sleeve to nest a lower spring ring, so as to initially fix the two steel sleeves.

[0019] S4. Insert prestressed steel bars through the reserved prestressed steel bar channel and tension them to the design value to apply radial pressure to the steel ring.

[0020] S5. The connecting holes on the assembly plate located on the same side are tightened and locked using a bolt and nut assembly;

[0021] S6. Connect the beam to the steel collar to complete the dry connection of the beam-column joint.

[0022] Compared with the prior art, the present invention provides a dry connection node for prefabricated concrete frame beams and columns and its connection method, which has the following beneficial effects:

[0023] This invention uses two standardized steel rings to enclose the precast hollow concrete column at the corresponding frame beam-column joint, with a spring ring at each end for tightening. Prestressed steel bars are then used for tensioning to provide sufficient radial pressure on the ring column, ensuring adequate friction between the steel ring plate and the precast hollow concrete column. This ensures the transmission of bending moment, shear force, and axial force at the frame beam-column joint. Subsequently, the assembly plate is locked with bolt and nut assemblies, further providing radial pressure on the ring column and increasing friction between the steel ring plate and the precast hollow concrete column. This serves as a second line of defense for transmitting bending moment, shear force, and axial force at the frame beam-column joint, preventing the prestressed relaxation joint from losing its ability to transmit these forces.

[0024] This invention can be flexibly adjusted and installed according to the location of the preset beam-column joint. It uses two standardized steel rings fixed on the precast concrete hollow column to achieve the connection with the beam and can bear the bending moment transmitted from the beam to the precast concrete hollow column. It has a simple structure, a high degree of standardization, and low construction cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0028] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0029] Figure 4 This is an exploded view of the parts of the present invention;

[0030] Figure 5 This is a three-dimensional structural diagram of a steel ferrule;

[0031] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0032] Figure 7 This is a schematic diagram illustrating the connection between the steel collar and the beam according to the present invention.

[0033] Reference numerals: 1. Precast concrete hollow column; 2. Steel collar; 21. Steel ring plate; 211. First positioning groove; 212. Second positioning groove; 213. Third positioning groove; 22. Assembly plate; 221. Connecting hole; 23. Rib plate; 24. Through hole; 25. Upper ring plate; 26. Lower ring plate; 3. Locking assembly; 31. Upper spring ring; 32. Lower spring ring; 33. Prestressed steel bar; 34. Bolt and nut assembly; 4. Buffer gap; 5. Beam. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The present invention will now be described in further detail through detailed embodiments and in conjunction with the accompanying drawings.

[0040] Please refer to Figures 1 to 7 This embodiment provides a prefabricated concrete frame beam-column dry connection node, including a precast concrete hollow column 1 and two steel rings 2 for connecting beams 5. The two steel rings 2 are symmetrically distributed and enclose the precast concrete hollow column 1. A locking assembly 3 is locked between the two steel rings 2. The locking assembly 3 includes an upper spring ring 31, a lower spring ring 32, at least one prestressed steel bar 33, and several bolt and nut assemblies 34. The steel ring 2 includes a semi-circular steel ring plate 21, assembly plates 22 fixedly connected to both ends of the steel ring plate 21, and a plurality of ribs 23 spaced apart along the outer wall of the steel ring plate 21. The inner surface of the steel ring plate 21 is in close contact with the outer wall of the precast concrete hollow column 1. The upper outer wall of the steel ring plate 21 is provided with a first positioning groove 211 above the ribs 23 for nesting the upper spring ring 31. The lower outer wall of the steel ring plate 21 is provided with a second positioning groove 212 below the ribs 23 for nesting the lower spring ring 32. The middle outer wall of the steel ring plate 21 is provided with a prestressed steel bar channel through which the prestressed steel bar 33 passes. The assembly plate 22 is provided with a connecting hole 221 for assembling the bolt and nut assembly 34. Thus, two standardized steel rings are used to enclose the precast hollow concrete column at the corresponding frame beam-column joint, with a spring ring at each end for tightening. Prestressed steel bars are then used for tensioning to provide sufficient radial pressure on the ring column, ensuring adequate friction between the steel ring plate and the precast hollow concrete column. This ensures the transmission of bending moment, shear force, and axial force at the frame beam-column joint. Subsequently, the assembly plate is locked using bolt and nut assemblies, further providing radial pressure on the ring column and increasing friction between the steel ring plate and the precast hollow concrete column. This serves as a second line of defense for transmitting bending moment, shear force, and axial force at the frame beam-column joint, preventing the prestressed relaxation joint from losing its ability to transmit these forces.

[0041] In some specific implementation methods, refer to Figure 5 andFigure 6 The prestressed steel bar channel includes a third positioning groove 213 opened on the outer wall of the steel ring plate 21 and a through hole 24 penetrating the assembly plate 22 and the rib plate 23.

[0042] Specifically, such as Figure 5 As shown, the first positioning groove 211, the second positioning groove 212, and the third positioning groove 213 are preferably distributed in parallel in the horizontal direction. This facilitates the application of radial pressure to the steel ring plate by the upper spring ring, the lower spring ring, and each prestressed steel bar.

[0043] In some specific embodiments, the first positioning groove 211, the second positioning groove 212, and the third positioning groove 213 are all rectangular grooves. This facilitates the precise positioning and fixing of the upper spring ring, the lower spring ring, and each prestressed steel bar onto the steel ring plate, preventing loosening and slippage.

[0044] In some specific implementation methods, such as Figure 3 As shown, the two assembly plates 22 located at both ends of the steel ring plate 21 are coplanarly distributed, and after the two steel rings 2 enclose the precast concrete hollow column 1, a buffer gap 4 is left between the two assembly plates 22 that are locked together on the same side. Because of the reserved buffer gap, it is convenient to apply radial pressure of the ring column to the steel ring plate using prestressed steel bars.

[0045] Preferably, the width of the buffer gap 4 is not less than 20mm.

[0046] In some specific implementation methods, such as Figure 3 As shown, the ribs 23 are evenly distributed along the outer wall of the steel ring plate 21 and are perpendicular to the outer wall of the steel ring plate 21.

[0047] In this embodiment, reference Figure 1 , Figure 4 and Figure 5 Each rib 23 and the top of the assembly plate 22 are connected to an upper ring plate 25, and each rib 23 and the bottom of the assembly plate 22 are connected to a lower ring plate 26. The inner wall of the upper ring plate 25 is fixedly connected to the outer wall of the steel ring plate 21, and the inner wall of the lower ring plate 26 is fixedly connected to the outer wall of the steel ring plate 21. This improves the overall strength. Furthermore, the upper and lower ring plates can also be used to connect to beams.

[0048] Preferably, the thickness of the steel ring plate 21, the assembly plate 22, the rib plate 23, the upper ring plate 25, and the lower ring plate 26 is not less than 20mm. This ensures that the steel ring has sufficient structural strength.

[0049] In this embodiment, reference Figures 1 to 6As an example, the number of prestressed steel bars 33 and prestressed steel bar channels is four, and they are evenly distributed along the outer wall of the steel ring 2. Each assembly plate 22 has eight connecting holes 221, arranged in four layers, with two connecting holes 221 in each layer. Each steel ring plate 21 has three ribs 23. This provides a sufficiently large locking force, radial pressure on the ring column, and gives the steel ring high overall strength. Of course, those skilled in the art can flexibly adjust the number of prestressed steel bars 33 and bolt and nut assemblies 34 according to actual needs and overall height, and are not limited to the numbers described in the above example.

[0050] Further reference Figure 4 and Figure 7 The above-mentioned connection method for dry connection nodes of prefabricated concrete frame beams and columns includes the following steps:

[0051] S1. Precast high-strength precast concrete hollow columns 1 in advance;

[0052] S2. Two standardized steel rings 2 are placed around the outer wall of the precast concrete hollow column 1 at the beam-column joint.

[0053] S3. An upper spring ring 31 is nested in the first positioning groove 211 set on the upper part of the steel ring 2, and a lower spring ring 32 is nested in the second positioning groove 212 set on the lower part of the steel ring 2 to achieve the initial fixation of the two steel rings 2 by the stirrups.

[0054] S4. Insert prestressed steel bars 33 into the reserved prestressed steel bar channel and tension them to the design value to apply sufficient radial pressure to the two enclosing steel rings 2, thereby ensuring sufficient friction between the steel ring plate and the precast concrete hollow column.

[0055] S5. The connecting holes 221 on the assembly plate 22 on the same side are tightened and locked with bolt and nut assembly 34 to further provide a certain radial pressure on the ring column, increase the friction between the steel ring plate and the precast concrete hollow column, and serve as a second line of defense to transmit bending moment, shear force and axial force at the frame beam-column joint, so as to prevent the prestressed relaxation joint from losing its ability to transmit bending moment, shear force and axial force.

[0056] S6. Finally, according to the structure and type of beam 5, beam 5 is connected to the steel collar 2 in an appropriate manner to complete the dry connection of the beam-column joint. For example, for steel beams, the upper and lower flanges of the steel beam can be welded to the upper and lower ring plates respectively or bolted together, and the web of the steel beam can be welded to the ribs or bolted together; for concrete beams, the upper and lower reinforcing bars can be welded to the upper and lower ring plates respectively, and the steel collar can be integrally cast and connected to the concrete beam.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A prefabricated concrete frame beam-column dry connection node, comprising a precast hollow concrete column and two steel collars for connecting beams, wherein the two steel collars are symmetrically distributed and enclose the precast hollow concrete column, characterized in that: A locking assembly is used to lock the two steel rings together. The locking assembly includes an upper spring ring, a lower spring ring, at least one prestressed steel bar, and several bolt and nut assemblies. Each steel ring includes a steel ring plate with a semi-circular cross-section, assembly plates fixedly connected to both ends of the steel ring plate, and several ribs spaced apart along the outer wall of the steel ring plate. The inner surface of the steel ring plate is in close contact with the outer wall of the precast concrete hollow column. The upper outer wall of the steel ring plate has a first positioning groove located above the ribs for nesting the upper spring ring, and the lower outer wall of the steel ring plate has a groove located below the ribs for nesting the lower spring ring. The second positioning groove of the ring, the outer wall of the middle part of the steel ring plate is provided with a prestressed steel bar channel for the corresponding prestressed steel bar to pass through, and the assembly plate is provided with a connecting hole for assembling the bolt and nut assembly; the two assembly plates located at both ends of the steel ring plate are coplanarly distributed, and after the two steel rings enclose the precast concrete hollow column, a buffer gap is left between the two assembly plates located on the same side and locked together; the prestressed steel bar channel includes a third positioning groove opened on the outer wall of the steel ring plate and a through hole penetrating the assembly plate and the rib plate; the first positioning groove, the second positioning groove and the third positioning groove are parallel in the horizontal direction.

2. The dry connection node for prefabricated concrete frame beams and columns according to claim 1, characterized in that: The first positioning groove, the second positioning groove, and the third positioning groove are all grooves with a rectangular cross-sectional shape.

3. The dry connection node for prefabricated concrete frame beams and columns according to claim 1, characterized in that: The ribs are evenly distributed along the outer wall of the steel ring plate and are perpendicular to the outer wall of the steel ring plate.

4. The dry connection node for prefabricated concrete frame beams and columns according to claim 1, characterized in that: The top of each rib and the top of the assembly plate are connected to an upper ring plate, and the bottom of each rib and the bottom of the assembly plate are connected to a lower ring plate. The inner wall of the upper ring plate is fixedly connected to the outer wall of the steel ring plate, and the inner wall of the lower ring plate is fixedly connected to the outer wall of the steel ring plate.

5. The dry connection node for prefabricated concrete frame beams and columns according to claim 4, characterized in that: The thickness of the steel ring plate, the assembly plate, the rib plate, the upper ring plate, and the lower ring plate is not less than 20 mm.

6. The dry connection node for prefabricated concrete frame beams and columns according to claim 1, characterized in that: The number of prestressed steel bars and prestressed steel bar channels is four, and they are evenly distributed along the outer wall of the steel ring; each assembly plate has eight connection holes, which are arranged in four layers, with two connection holes in each layer.

7. A connection method for a dry connection node of a prefabricated concrete frame beam-column as described in claims 1-6, characterized in that, Includes the following steps: S1. Pre-fabricate high-strength precast hollow concrete columns; S2. Two steel rings are placed around the outer wall of the precast concrete hollow column at the beam-column joint. S3. Use the first positioning groove set on the upper part of the steel sleeve to nest an upper spring ring, and use the second positioning groove set on the lower part of the steel sleeve to nest a lower spring ring, so as to initially fix the two steel sleeves. S4. Insert prestressed steel bars through the reserved prestressed steel bar channel and tension them to the design value to apply radial pressure to the steel ring. S5. The connecting holes on the assembly plate located on the same side are tightened and locked using a bolt and nut assembly; S6. Connect the beam to the steel collar to complete the dry connection of the beam-column joint.

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