Prefabricated frame connection node, prefabricated frame and assembly method

Abstract

The present invention discloses an assembled frame connection node, an assembled frame and an assembly method in the field of building technology. The assembled frame connection node includes a node core area and beam-column embedded parts. The beam-column embedded parts include end plates. The node core area includes an upper flange plate, a lower flange plate and a longitudinal partition connected therebetween, and a connecting plate arranged on the longitudinal partition. The beam-column embedded parts are used to be embedded in prefabricated beams and prefabricated columns. The node core area is used to connect the end plates so that the prefabricated beams and prefabricated columns are assembled into an assembled frame. The present application forms an assembled frame by arranging beam-column embedded parts on prefabricated beams and columns, and connecting the beam-column embedded parts using the node core area. The connection parts are exposedly installed with bolts, and the structure is safe and reliable. No temporary support is required during the construction process, and no wet work is required in the node area, which is conducive to reducing construction costs. In addition, the construction of the upper frame does not affect the construction of the cast-in-place layer of the lower concrete floor slab, which is conducive to speeding up the construction progress.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to an assembled frame connection node, an assembled frame and an assembly method. Background Art

[0002] Prefabricated concrete structures are concrete structures that are assembled and connected with prefabricated components as the main load-bearing components. They have the advantages of high construction efficiency and are more in line with green construction requirements. According to the requirements of the "Technical Specifications for Prefabricated Concrete Structures" (JGJ 1-2014), the floor slabs of prefabricated concrete frame structures must be cast in place to ensure the integrity of the structure. In order to meet the requirements of the specifications, the beams of prefabricated concrete frame structures usually need to be constructed twice, namely, the prefabricated part and the cast-in-place part. Since the steel bars of the slabs and beams need to be anchored in the nodes, the nodes need to be cast in place, and grouting sleeves need to be set up for the connection between prefabricated beams, columns and nodes. This node connection method requires more temporary supports, a large amount of on-site wet work, a long construction period, and the quality of the concrete inside the grouting sleeve is difficult to detect. Under the requirements of the specifications, how to further reduce on-site wet work, optimize the node connection structure and assembly method, and speed up the construction progress is an urgent problem to be solved. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the existing prefabricated frames, the technical problem to be solved by the present invention is to provide a prefabricated frame connection node with high construction efficiency, a prefabricated frame and an assembly method.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An assembled frame connection node includes a node core area and beam-column embedded parts, the beam-column embedded parts include an end plate, a bolt and a shear key adapter groove arranged on one side of the end plate, the shear key adapter groove is located at the center of the end plate, a first through hole is arranged around the end plate, a threaded hole is arranged at one end of the bolt connected to the end plate, and the threaded hole is aligned with the first through hole, the node core area includes an upper flange plate, a lower flange plate and a longitudinal partition connected therebetween, and a connecting plate arranged on the longitudinal partition, a shear key matching the shear key adapter groove is arranged in the middle of the upper flange plate, the lower flange plate and the connecting plate, and a second through hole matching the first through hole is arranged around the periphery.

[0006] Furthermore, the node core area includes a bottom column node, an intermediate layer node and a top column node, no connecting plate is provided on the bottom column node, and no shear key and second through hole are provided on the upper flange plate of the top column node.

[0007] Furthermore, the height of the longitudinal partitions of the middle layer nodes and the top layer column top nodes is 200-500 mm, and a transverse partition is provided in the middle of the longitudinal partition.

[0008] Furthermore, the connecting plate and the longitudinal partition are connected via H-shaped steel, and the length of the H-shaped steel is 200-500 mm.

[0009] Furthermore, semicircular holes are provided on the upper and lower flange plates of the H-shaped steel.

[0010] Furthermore, a hemispherical cap is disposed at one end of the bolt away from the end plate, and the outer diameter of the hemispherical cap is greater than the outer diameter of the bolt.

[0011] The assembled frame includes precast beams and precast columns of reinforced concrete, and also includes assembled frame connection nodes, wherein the end plates of the beam-column embedded parts are embedded in the ends of the precast beams and precast columns, and the steel cages of the precast beams and precast columns are welded to the end plates, and the precast beams and precast columns are connected through the node core area to form the assembled frame.

[0012] Furthermore, the steel cage of the precast beam includes bottom longitudinal bars and stirrups, the bottom longitudinal bars are welded to the bottom of the end plate, embedded bars are provided in the middle of the end plate, the top of the stirrups exceeds the concrete upper surface of the precast beam, and the exceeding height is the thickness of the upper floor and roof panels minus 15 mm, top longitudinal bars are interspersed on the top of the stirrups, the ends of the top longitudinal bars are welded to the core area of ​​the node, and a cast-in-place layer is provided on the upper surface of the precast beam to cover the top of the stirrups and the top longitudinal bars.

[0013] Furthermore, for the precast beams that need to be installed with floor slabs, the cast-in-place layer on the upper surface of the precast beams is cast integrally with the cast-in-place layer of the floor slabs; for the precast beams on the top floor, if there are beams on both sides of the node core area, the top longitudinal reinforcement is set through the top of the node core area; if there is a beam on only one side of the node core area, the top longitudinal reinforcement is bent downward and welded to the upper flange plate, and U-shaped stirrups are welded on the upper flange plate to constrain the top longitudinal reinforcement.

[0014] The assembly method of the assembled frame comprises the following steps:

[0015] a. According to the frame structure and the size of beams and columns, fabricate the connection nodes of the assembled frame and the reinforcement cages of beams and columns, and weld the embedded parts of beams and columns with the reinforcement cages of beams and columns;

[0016] b. Pour concrete to make precast beams and columns, where the precast beams do not contain top longitudinal reinforcement, and the top of the stirrups exceeds the upper surface of the concrete of the precast beams, and the height of the excess is the thickness of the upper floor and roof panels minus 15mm;

[0017] c. Use the node core area and assemble beams and columns according to the frame structure to prefabricate the frame;

[0018] d. Connect the top longitudinal reinforcement to the top of the stirrups of the precast beam, and weld the top longitudinal reinforcement to the longitudinal diaphragm in the core area of ​​the node;

[0019] e. Install the precast floor slab on the precast beams, then tie the negative moment reinforcement of the cast-in-place layer, and finally cast the cast-in-place floor slab on the precast beams and the precast floor slab;

[0020] f. Install layer by layer from bottom to top according to steps c to e;

[0021] g. After the installation is completed, use anti-rust paint to treat the exposed steel in the node area, fill the gaps in the connecting parts with dry hard aerated concrete or rock wool, and paint with cement mortar.

[0022] The beneficial effects of the present invention are as follows: by arranging beam-column embedded parts on prefabricated beams and columns, and connecting the beam-column embedded parts using the node core area to form an assembled frame, the connection parts are exposedly installed with bolts, the structure is safe and reliable, no temporary support is required during the construction process, no wet work is required in the node area, which is conducive to reducing construction costs, and the construction of the upper frame does not affect the construction of the cast-in-place layer of the lower concrete floor slab, which is conducive to speeding up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the assembly-type frame connection node structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the bottom node structure of the bottom column of the present invention.

[0025] Figure 3 It is a schematic diagram of the top node structure of the top column of the present invention.

[0026] Figure 4 It is a schematic diagram of the bolt structure of the present invention.

[0027] Figure 5 It is a schematic diagram of the beam-column reinforcement cage structure of the present invention.

[0028] Figure 6 It is a schematic diagram of the beam-column structure of the present invention.

[0029] Figure 7 It is a schematic diagram of the structure of the prefabricated beam reinforcement cage of the present invention.

[0030] Figure 8 It is a schematic diagram of the connection structure between the intermediate layer node and the prefabricated beam reinforcement cage of the present invention.

[0031] Fig. 9 It is a schematic diagram of the connection structure between the top column top node and the prefabricated beam reinforcement cage of the present invention.

[0032] Fig.10 It is a schematic diagram of the installation structure of the frame and the floor slab of the present invention.

[0033] Marked in the figure, 1-node core area, 2-beam-column embedded parts, 3-precast beams, 4-precast columns, 5-precast layers of floor slabs, 6-cast-in-place layers of floor slabs, 11-upper flange plate, 12-lower flange plate, 13-longitudinal partition, 14-connecting plate, 15-shear key, 16-second through hole, 17-transverse partition, 18-H-shaped steel, 19-semicircular hole, 21-end plate, 22-stud, 23-shear key adapter groove, 24-first through hole, 25-threaded hole, 26-hemispherical top cap, 27-embedded reinforcement, 31-bottom longitudinal reinforcement, 32-stirrups, 33-top longitudinal reinforcement, 34-U-shaped stirrups. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings.

[0035] like Figure 1-4 As shown, the prefabricated frame connection node of the present invention includes a node core area 1 and a beam-column embedded part 2, the beam-column embedded part 2 includes an end plate 21, a bolt 22 and a shear key adapter groove 23 arranged on one side of the end plate 21, the shear key adapter groove 23 is located at the center of the end plate 21, and a first through hole 24 is arranged around the end plate 21, a threaded hole 25 is arranged at the end of the bolt 22 connected to the end plate 21, and the threaded hole 25 is aligned with the first through hole 24, the node core area 1 includes an upper flange plate 11, a lower flange plate 12 and a longitudinal partition 13 connected therebetween, and a connecting plate 14 arranged on the longitudinal partition 13, a shear key 15 matching the shear key adapter groove 23 is arranged in the middle of the upper flange plate 11, the lower flange plate 12 and the connecting plate 14, and a second through hole 16 matching the first through hole 24 is arranged around the periphery.

[0036] The beam-column embedded parts 2 are used to be embedded in the precast beams 3 and precast columns 4, wherein the end plates 21 are located at the installation ends of the precast beams 3 and precast columns 4, and the upper flange plates 11, lower flange plates 12 and connecting plates 14 on the node core area 1 are used to connect the end plates 21, so that the precast beams 3 and precast columns 4 are assembled into an assembled frame. During the connection process, the shear key adapter groove 23 on the end plate 21 is first matched and docked with the shear key 15 on the upper flange plate 11, the lower flange plate 12 and the connecting plate 14, and the first through hole 24 is aligned with the second through hole 16, and then the bolts are tightened by passing through the second through hole 16, the first through hole 24 and the threaded hole 25 on the stud 22 in sequence.

[0037] For the node core area 1, according to the usage and installation position, it can be divided into the bottom node of the bottom column, the middle node and the top node of the top column. The bottom node of the bottom column is used to connect the prefabricated column and the foundation, such as Figure 2 As shown, because there is no connecting beam, there is no need to set the connecting plate 14, and the height is too high; the middle layer node is as shown in Figure 1 As shown, a connecting plate 14 needs to be provided, and the height is relatively high; the top column top node, such as Figure 3 As shown, because there is no prefabricated column on the top, the shear key 15 and the second through hole 16 are not required to be provided on the upper flange plate 11.

[0038] For the middle layer nodes and the top column nodes, since the size of the beams and floor slabs needs to be considered, the height of the longitudinal partitions 13 at the middle layer nodes and the top column nodes is 200-500mm. At the same time, in order to increase the structural strength, it is best to set a transverse partition 17 in the middle of the longitudinal partition 13 to transfer the force of the upper flange plate of the beam.

[0039] Furthermore, for the convenience of installation, the connecting plate 14 is connected to the longitudinal partition 13 through the H-shaped steel 18, so that the connecting plate 14 extends out of the node core area 1. Considering the structural strength, the length of the H-shaped steel 18 is 200-500mm, which can leave enough assembly space. Semicircular holes 19 are also provided on the upper and lower flange plates of the H-shaped steel 18 to form plastic hinges here, forming a dog-bone connection to ensure a strong column and weak beam design.

[0040] For the bolt 22, in order to facilitate the processing of the threaded hole 25, a threaded sleeve structure can be used. However, in order to prevent concrete from entering the threaded hole 25 during the production of prefabricated beams and columns, a hemispherical top cap 26 can be provided at the end of the bolt 22 away from the end plate 21, such as Figure 4 As shown, the outer diameter of the hemispherical top cap 26 is about 5 mm larger than the outer diameter of the bolt 22, which can prevent concrete from entering the threaded hole 25 and prevent the end plate 21 from loosening and detaching from the precast concrete beam and column.

[0041] The assembled frame made by the assembled frame connection node includes a precast beam 3 and a precast column 4 made of reinforced concrete, and also includes an assembled frame connection node, wherein the end plate 21 of the beam-column embedded part 2 is embedded in the end of the precast beam 3 and the precast column 4, and the steel cage of the precast beam 3 and the precast column 4 is welded to the end plate 21. The specific structure is as follows Figure 5 , Figure 6 As shown, the prefabricated beam 3 and the prefabricated column 4 are connected through the node core area to form an assembled frame. By adopting appropriate bottom nodes of the bottom column, middle nodes and top nodes of the top column, a straight, L-shaped, T-shaped or cross-shaped frame structure can be realized. When designing the assembled frame connection nodes according to the prefabricated beams and columns, the edge of the end plate 21 should be 10-15mm smaller than the edge of the prefabricated beam and column, so as to leave a gap for subsequent filling and painting to avoid exposure of the steel structure.

[0042] For the precast beam 3, considering the need to be assembled and connected with the floor slab and to meet the requirements of the Technical Specifications for Prefabricated Concrete Structures, a cast-in-place layer needs to be set on the precast beam to ensure the integrity of the structure. Therefore, the preferred solution is that the steel cage of the precast beam 3 includes bottom longitudinal bars 31 and stirrups 32, such as Figure 7As shown, the bottom longitudinal reinforcement 31 is welded to the bottom of the end plate 21, and an embedded reinforcement 27 is provided in the middle of the end plate 21. The end of the embedded reinforcement 27 can be bent so as to be stably connected with the concrete. Figure 8 As shown, the top of the stirrup 32 exceeds the upper concrete surface of the precast beam 3, and the exceeding height is the thickness of the upper floor and roof panels minus 15mm. The top longitudinal reinforcement 33 is inserted into the top of the stirrup 32, and the end of the top longitudinal reinforcement 33 is welded to the node core area 1. The upper surface of the precast beam 3 is provided with a cast-in-place layer to cover the top of the stirrup 32 and the top longitudinal reinforcement 33. The cast-in-place layer can make the precast beam 3 and the precast column 4 cast together, thereby improving the integrity of the structure.

[0043] like Fig.10 As shown, for the precast beam 3 that needs to be installed with the floor slab, the floor slab is divided into a precast floor slab layer 5 and a cast-in-place floor slab layer 6. The precast floor slab layer 5 is flush with the concrete upper surface of the precast beam 3, and the cast-in-place layer on the upper surface of the precast beam 3 can be directly cast and formed integrally with the cast-in-place floor slab layer 6, thereby meeting the requirement of the Technical Specifications for Prefabricated Concrete Structures that a cast-in-place layer be set for the floor slab; Fig. 9 As shown, for the precast beam 3 on the top layer, if there are beams on both sides of the node core area 1, the top longitudinal reinforcement 33 is set through the top of the node core area 1; if there is a beam on only one side of the node core area 1, the top longitudinal reinforcement 33 is bent downward and welded to the upper flange plate 11, and U-shaped stirrups 34 are welded on the upper flange plate 11 to constrain the top longitudinal reinforcement 33.

[0044] The assembly method of the assembled frame comprises the following steps:

[0045] a. According to the frame structure and the size of beams and columns, fabricate the connection nodes of the assembled frame and the reinforcement cages of beams and columns, and weld the embedded parts of beams and columns with the reinforcement cages of beams and columns;

[0046] b. Pour concrete to make precast beams and columns, where the precast beams do not contain top longitudinal reinforcement, and the top of the stirrups exceeds the upper surface of the concrete of the precast beams, and the height of the excess is the thickness of the upper floor and roof panels minus 15mm;

[0047] c. Use the node core area and assemble beams and columns according to the frame structure to prefabricate the frame;

[0048] d. Connect the top longitudinal reinforcement to the top of the stirrups of the precast beam, and weld the top longitudinal reinforcement to the longitudinal diaphragm in the core area of ​​the node;

[0049] e. Install the precast floor slab on the precast beams, then tie the negative moment reinforcement of the cast-in-place layer, and finally cast the cast-in-place floor slab on the precast beams and the precast floor slab;

[0050] f. Install layer by layer from bottom to top according to steps c to e;

[0051] g. After the installation is completed, use anti-rust paint to treat the exposed steel in the node area, fill the gaps in the connecting parts with dry hard aerated concrete or rock wool, and paint with cement mortar.

[0052] The present application forms an assembled frame by arranging beam-column embedded parts on prefabricated beams and columns and connecting the beam-column embedded parts using the node core area. The connection parts are exposed with bolts, the structure is safe and reliable, no temporary support is required during the construction process, and no wet work is required in the node area, which is conducive to reducing construction costs. In addition, the construction of the upper frame does not affect the construction of the cast-in-place layer of the lower concrete floor slab, which is conducive to speeding up the construction progress and has a good application prospect.

Claims

1. The assembled frame connection node is characterized by: The invention comprises a node core area (1) and a beam-column embedded part (2), wherein the beam-column embedded part (2) comprises an end plate (21), a bolt (22) and a shear key adapting groove (23) arranged on one side of the end plate (21), wherein the shear key adapting groove (23) is located at the center of the end plate (21), a first through hole (24) is arranged around the end plate (21), a threaded hole (25) is arranged at one end of the bolt (22) connected to the end plate (21), and the threaded hole (25) is aligned with the first through hole (24), and the node core area (1) comprises an upper flange plate (11), a lower flange plate (12) and a longitudinal diaphragm (13) connected therebetween, and a connecting plate (11) arranged on the longitudinal diaphragm (13) 4), a shear key (15) matching the shear key adapter groove (23) is provided in the middle of the upper flange plate (11), the lower flange plate (12) and the connecting plate (14), and a second through hole (16) matching the first through hole (24) is provided around the periphery, the node core area (1) includes a bottom column node, an intermediate layer node and a top column node, the bottom column node is not provided with a connecting plate (14), the upper flange plate (11) of the top column node is not provided with a shear key (15) and a second through hole (16), and the end of the bolt (22) away from the end plate (21) is provided with a hemispherical top cap (26), and the outer diameter of the hemispherical top cap (26) is greater than the outer diameter of the bolt (22).

2. The assembled frame connection node according to claim 1, characterized in that: The height of the longitudinal partitions (13) of the middle layer nodes and the top layer column top nodes is 200-500 mm, and a transverse partition (17) is provided in the middle of the longitudinal partitions (13).

3. The assembled frame connection node according to claim 1, characterized in that: The connecting plate (14) is connected to the longitudinal partition plate (13) via an H-shaped steel (18), and the length of the H-shaped steel (18) is 200-500 mm.

4. The assembled frame connection node according to claim 3, characterized in that: Semicircular holes (19) are provided on the upper and lower flange plates of the H-shaped steel (18).

5. An assembled frame comprising prefabricated reinforced concrete beams (3) and prefabricated columns (4), characterized in that: It also includes an assembled frame connection node as described in any one of claims 1 to 4, wherein the end plate (21) of the beam-column embedded part (2) is embedded in the end of the precast beam (3) and the precast column (4), and the steel cage of the precast beam (3) and the precast column (4) is welded to the end plate (21), and the precast beam (3) and the precast column (4) are connected through the node core area (1) to form an assembled frame.

6. The assembled frame according to claim 5, characterized in that: The steel cage of the precast beam (3) comprises bottom longitudinal bars (31) and stirrups (32), wherein the bottom longitudinal bars (31) are welded to the bottom of the end plate (21), and a pre-embedded bar (27) is arranged in the middle of the end plate (21). The top of the stirrups (32) exceeds the concrete upper surface of the precast beam (3), and the exceeding height is the thickness of the upper floor and roof panels minus 15 mm. A top longitudinal bar (33) is inserted into the top of the stirrups (32), and the end of the top longitudinal bar (33) is welded to the node core area (1). A cast-in-place layer is arranged on the upper surface of the precast beam (3) to cover the top of the stirrups (32) and the top longitudinal bars (33).

7. The assembled frame according to claim 6, characterized in that: For the precast beam (3) to be installed with the floor slab, the cast-in-place layer on the upper surface of the precast beam (3) is integrally cast with the cast-in-place layer of the floor slab; for the precast beam (3) on the top floor, if there are beams on both sides of the node core area (1), the top longitudinal reinforcement (33) is arranged through the top of the node core area (1); if there is a beam on only one side of the node core area (1), the top longitudinal reinforcement (33) is bent downward and welded to the upper flange plate (11), and the upper flange plate (11) is welded with a U-shaped stirrup (34) to constrain the top longitudinal reinforcement (33).

8. A method for assembling a prefabricated frame as claimed in claim 7, characterized in that: The following steps are involved: a. According to the frame structure and the size of beams and columns, fabricate the connection nodes of the assembled frame and the reinforcement cages of beams and columns, and weld the embedded parts of beams and columns with the reinforcement cages of beams and columns; b. Pour concrete to make precast beams and columns, where the precast beams do not contain top longitudinal reinforcement, and the top of the stirrups exceeds the upper surface of the concrete of the precast beams, and the height of the excess is the thickness of the upper floor and roof panels minus 15mm; c. Use the node core area and assemble beams and columns according to the frame structure to form a prefabricated frame; d. Connect the top longitudinal reinforcement to the top of the stirrups of the precast beam, and weld the top longitudinal reinforcement to the longitudinal diaphragm in the core area of ​​the node; e. Install the precast floor slab on the precast beams, then tie the negative moment reinforcement of the cast-in-place layer, and finally cast the cast-in-place floor slab on the precast beams and the precast floor slab; f. Install layer by layer from bottom to top according to steps c to e; g. After the installation is completed, use anti-rust paint to treat the exposed steel in the node area, fill the gaps in the connecting parts with dry hard aerated concrete or rock wool, and paint with cement mortar.

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