Steel connection beam-column joint of post-cast mixed frame in middle of column

Abstract

The utility model discloses a post-cast mixed frame steel connecting beam column joint in the middle of a column, which comprises a precast concrete column with a column top end steel connecting piece and a first connecting end plate at the bottom of the column, and a precast concrete beam with a beam end steel connecting piece, and a post-cast hole is formed in the center of the precast concrete column; during installation, a reinforcement cage is inserted into the post-pouring hole according to the stress condition, then the column top end steel connecting piece located on the lower portion is connected with the first connecting end plate located on the upper portion through bolts, then post-pouring concrete is poured into the hole and the interior of the column top end steel connecting piece, and the column top end steel connecting piece is connected with the beam end steel connecting piece through bolts or bolt welding. According to the utility model, high-efficiency support-free splicing of precast concrete beams and columns is realized, the construction efficiency is improved, the joint adopts a concrete filled steel tube form to realize the enhancement of a core area, a plastic hinge is generated on a beam end steel connecting piece through reasonable design, and the advantages of energy consumption and deformation of a steel structure can be fully exerted.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled reinforced concrete frame structure engineering, in particular to a post-cast mixed frame steel connection beam-column node in the middle of a column. Background Art

[0002] At present, most of the prefabricated frame structure systems in my country adopt the form of prefabricating beams and columns in factories and then assembling and connecting them at the nodes. However, the beam-column nodes of the frame structure are complex and weak parts, which are not conducive to earthquake resistance. The steel bars at the beam-column nodes are dense, and it is difficult to locate and assemble the steel bars when the prefabricated beams and columns are hoisted at the nodes. In addition, using traditional construction technology, the density of the post-poured concrete at the nodes and the construction quality of the joints between the post-poured concrete and the prefabricated concrete are difficult to guarantee. In view of some of the shortcomings of the above-mentioned existing prefabricated and assembled reinforced concrete frame structure systems and construction technologies, it is necessary to develop a sub-structure assembled reinforced concrete frame structure system and its construction method with flexible and reasonable prefabricated component styles, simple and clear internal forces at the assembly positions, and reliable connections. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a post-cast hybrid frame steel connection beam-column node in the middle of the column, which has the advantages of flexible and reasonable prefabricated component style, simple and clear internal force at the assembly position, reliable connection and improved overall seismic performance.

[0004] The utility model solves the above problems through the following technical means:

[0005] A post-cast hybrid frame steel connection beam-column node in the middle of a column, comprising:

[0006] A precast column, comprising a precast concrete column, a column top steel connector embedded in the top of the precast concrete column, and a first connection end plate embedded in the bottom of the precast concrete column, a concrete pouring hole is provided in the middle of the column top steel connector and the middle of the first connection end plate, a post-casting hole connected to the concrete pouring hole is provided in the center of the precast concrete column, the column top steel connector of the lower layer is fixedly connected to the first connection end plate of the adjacent upper layer by bolts; column longitudinal reinforcement and column stirrups arranged at intervals along the length direction of the column longitudinal reinforcement are arranged in the precast concrete column.

[0007] A precast beam, the precast beam comprising a precast concrete beam and a beam end steel connector embedded in the end of the precast concrete beam, the column top steel connector is fixedly connected to the beam end steel connector; the precast concrete beam is provided with beam longitudinal reinforcement and beam stirrups arranged at intervals along the length direction of the beam longitudinal reinforcement.

[0008] Furthermore, a short H-shaped steel bracket is fixedly connected to the side wall of the steel connector at the top of the column. The steel connector at the beam end includes an H-shaped steel and a beam end steel plate fixedly connected. The short H-shaped steel bracket is fixedly connected to the H-shaped steel by bolts. The beam end steel plate is closely attached to the end of the precast concrete beam. Shear keys are arranged in the precast concrete beam, and both the shear keys and the beam longitudinal reinforcement are fixedly connected to the beam end steel plate.

[0009] Furthermore, the steel connector at the top of the column is fixedly connected with a third connection end plate, a first rectangular steel pipe, and a second connection end plate in sequence from bottom to top along the axis of the precast column. Concrete pouring holes are arranged in the middle of both the second connection end plate and the third connection end plate. The second connection end plate is fixedly connected to the corresponding first connection end plate by bolts. Column end stiffening ribs are vertically arranged at the fixed connection of the second connection end plate and the third connection end plate to the first rectangular steel pipe.

[0010] Furthermore, a first upper cross diaphragm and a first lower cross diaphragm are fixedly arranged at intervals inside the first rectangular steel pipe. Concrete pouring holes are arranged in the middle of both the first upper cross diaphragm and the first lower cross diaphragm. Column end shear keys are fixedly connected to one side of the first connection end plate and the third connection end plate connected to the precast concrete column.

[0011] Furthermore, the shape and size of the post-cast hole can be reserved according to the actual situation, and a steel reinforcement cage or steel section can be inserted into it according to the stress situation. The post-cast hole penetrates through the middle of the column end shear key and communicates with the inside of the first rectangular steel pipe through the concrete pouring holes of the first connection end plate, the second connection end plate, and the third connection end plate. Post-cast concrete is poured through the post-cast hole and the inside of the first rectangular steel pipe. The post-cast concrete includes materials such as self-compacting concrete, grouting material, and concrete with large slump, but is not limited to this. The two ends of the column longitudinal reinforcement are respectively welded to the first connection end plate and the third connection end plate, and the column stirrups near the column end shear key are arranged in a dense manner.

[0012] Furthermore, the steel connector at the beam end is a beam end H-shaped steel. Part of the beam end H-shaped steel is buried in the precast concrete beam, which is divided into a buried part of the beam end H-shaped steel and a protruding part of the beam end H-shaped steel. The beam longitudinal reinforcement is lap-welded to the upper and lower flanges of the buried part of the beam end H-shaped steel. Studs are arranged on the buried part of the beam end H-shaped steel. The protruding part of the beam end H-shaped steel is fixedly connected to the steel connector at the top of the column by bolts.

[0013] Furthermore, the cross-section of the flange of the H-shaped steel can be horizontally changed according to actual needs, or a steel plate can be fixedly connected to the top of the flange at the end of the H-shaped steel.

[0014] Further, the third connecting end plate and the first connecting end plate are fixedly connected to a second rectangular steel pipe at one end of the precast concrete column, and the column longitudinal reinforcement bars are lap-welded to the side wall of the second rectangular steel pipe.

[0015] Further, along the axial direction of the precast column, the post-cast hole is located at a certain height at the end of the precast concrete column and does not penetrate the precast concrete column. A steel reinforcement cage can be inserted into it according to the stress condition. A number of perfusion holes are provided at a certain height on the side of the precast concrete column, and the perfusion holes communicate with the post-cast hole.

[0016] Further, perpendicular to the axial direction of the precast column, the cross-sections of the first connecting end plate, the second connecting end plate and the first rectangular steel pipe can be horizontally changed according to actual needs.

[0017] Further, the steel connector at the top of the column is fixedly connected to the third connecting end plate, the lower rectangular steel pipe, the second lower cross diaphragm, the middle rectangular steel pipe, the second upper cross diaphragm, the upper rectangular steel pipe and the second connecting end plate in sequence from bottom to top along the axial direction of the precast column; concrete pouring holes are provided in the middle of the third connecting end plate, the second lower cross diaphragm, the second upper cross diaphragm and the second connecting end plate; column end stiffening ribs are vertically provided at the fixed connection positions of the second connecting end plate and the third connecting end plate with the upper rectangular steel pipe and the lower rectangular steel pipe respectively; a connecting web is vertically provided on the side wall of the middle rectangular steel pipe, and the connecting web is fixedly connected to the beam end steel connector by bolts; the second upper cross diaphragm and the second lower cross diaphragm are respectively flush with the upper and lower flanges of the beam end steel connector and are welded.

[0018] A construction method for the post-cast hybrid frame steel-connected beam-column joint in the middle of the column as described above includes the following steps:

[0019] Step 1: Fabricate the steel connector at the top of the column embedded at the top of the precast concrete column, the first connecting end plate embedded at the bottom of the precast concrete column, and the beam end steel connector embedded at the end of the precast concrete beam. Bind the column stirrups and column longitudinal reinforcement bars, and the beam stirrups and beam longitudinal reinforcement bars respectively to form the precast concrete column steel reinforcement cage and the precast concrete beam steel reinforcement cage. Bind the steel reinforcement cage arranged in the post-cast hole. Then, weld the two ends of the column longitudinal reinforcement bars of the precast concrete column steel reinforcement cage to the steel connector at the top of the column and the first connecting end plate respectively, weld the beam longitudinal reinforcement bars of the precast concrete beam steel reinforcement cage to the beam end steel connector, and embed and weld the bolts in the bolt holes of the first connecting end plate.

[0020] Step 2: Formwork the parts that need to be poured with concrete, and arrange holes at the middle position of the cross-section of the precast concrete column according to the designed size of the post-cast hole. Then, pour and steam-cure the precast concrete column body and the precast concrete beam body respectively until the concrete reaches the preset strength value, so as to form the precast column and the precast beam.

[0021] Step 3: On-site installation of precast columns. Use a crane to first lift the upper and lower precast columns and align them at the designated position. Bolt-connect the steel connector at the top of the column embedded in the lower precast concrete column to the first connection end plate embedded in the upper precast concrete column. Then insert and fix the steel reinforcement cage inside the post-cast hole of the precast concrete column, and perform on-site concrete pouring through the post-cast hole. When pouring, insert the conduit into the post-cast hole to ensure that there is a certain drop within the allowable free fall range specified by the code during concrete pouring. Gradually pull out the conduit upward while pouring to fill the post-cast hole and the inside of the steel connector at the top of the column, completing the connection and installation of the precast column.

[0022] Step 4: On-site installation of precast beams. Use a crane to lift the precast beam to the designated position. According to specific embodiments, bolt-connect the steel connector at the beam end to the H-shaped steel short steel bracket of the steel connector at the top of the column, or perform bolt-welding connection between the steel connector at the beam end and the side wall of the rectangular steel pipe of the steel connector at the top of the column, completing the connection and installation of the precast beam and the precast column.

[0023] Advantages of the present utility model:

[0024] A steel-connected beam-column joint with post-cast in the middle of the column and a construction method provided by the present utility model has the following beneficial effects: There are no complex structural measures, no formwork support is required for on-site wet operations, no temporary support is needed, on-site assembly is simple and efficient, effectively improving the construction efficiency and quality, and solving the problem of difficult construction during the connection of joints in precast concrete structures. By designing to yield and dissipate energy at the steel connector at the beam end, and keeping other concrete parts with low damage, the energy dissipation and deformation advantages of steel structures are effectively utilized, fully combining the advantages of concrete structures and steel structures. The construction, anti-corrosion, and fire protection costs are lower than those of pure steel structures, and the energy dissipation and ductility are higher than those of pure precast concrete structures. Inserting a steel reinforcement cage and pouring post-cast concrete in the middle of the column section enhances the overall mechanical performance of the column. The core area of the column end joint adopts the form of concrete-filled steel tube, effectively enhancing the shear resistance of the core area of the joint, which is conducive to realizing the principle of "strong joints and weak members".

[0025] In summary, the steel-connected beam-column joint with post-cast in the middle of the column and the construction method of the present application are simple and efficient to install, can solve the above-mentioned problems while meeting various functions, improve the construction quality, strengthen the structural integrity and seismic performance, and have good economic and social benefits. Brief Description of the Drawings

[0026] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0027] Figure 1 It is a schematic structural diagram of a steel-connected beam-column joint with post-cast in the middle of the column provided for Embodiment 1;

[0028] Figure 2 Schematic diagram of the precast beam provided for Example 1;

[0029] Figure 3 Schematic diagram of the steel connector at the beam end provided for Example 1;

[0030] Figure 4 Schematic diagram of the precast column provided for Example 1;

[0031] Figure 5 Schematic diagram of the steel connector at the top of the column provided for Example 1;

[0032] Figure 6 Another schematic diagram of the precast beam provided for Example 1;

[0033] Figure 7 Internal schematic diagram of another precast column provided for Example 1;

[0034] Figure 8 Schematic diagram of another precast column and its connection provided for Example 1;

[0035] Figure 9 Schematic diagram of another precast column and its connection provided for Example 1;

[0036] Figure 10 Schematic diagram of the steel connection beam-column joint with post-cast hybrid frame in the middle of the column provided for Example 2;

[0037] Figure 11 Schematic diagram of the steel connector at the beam end provided for Example 2;

[0038] Figure 12 Schematic diagram of the steel connection beam-column joint with post-cast hybrid frame in the middle of the column provided for Example 3;

[0039] Figure 13 Schematic diagram of the steel connector at the top of the column provided for Example 3.

[0040] In the figure: 1 - precast concrete beam; 2 - steel connector at beam end; 3 - precast concrete column; 4 - steel connector at column top; 5 - first connecting end plate; 6 - H-shaped steel; 7 - steel plate at beam end; 8 - shear key; 9 - longitudinal beam reinforcement; 10 - beam stirrup; 11 - first rectangular steel pipe; 12 - third connecting end plate; 13 - second connecting end plate; 14 - first upper cross diaphragm; 15 - first lower cross diaphragm; 16 - shear key at column end; 17 - short steel bracket of H-shaped steel at column; 18 - post-cast hole; 19 - longitudinal column reinforcement; 20 - column stirrup; 21 - H-shaped steel at beam end; 22 - H-shaped steel with widened flange; 23 - H-shaped steel with weakened flange; 24 - H-shaped steel with additional steel plate; 25 - second rectangular steel pipe; 26 - lower rectangular steel pipe; 27 - middle rectangular steel pipe; 28 - upper rectangular steel pipe; 29 - second lower cross diaphragm; 30 - second upper cross diaphragm; 31 - connecting web; 32 - stiffening rib at column end; 33 - concrete pouring hole; 34 - through hole; 35 - stud; 36 - bolt; 37 - embedded part of H-shaped steel at beam end; 38 - protruding part of H-shaped steel at beam end; 39 - steel reinforcement cage; 40 - perfusion hole. Specific embodiments

[0041] To facilitate the understanding of the present invention, the following will describe the present invention in a more comprehensive and detailed manner in conjunction with preferred embodiments. However, the protection scope of the present invention is not limited to the following specific embodiments.

[0042] Embodiment 1

[0043] As Figures 1 to 5 shown, a steel-connected beam-column joint of a post-cast hybrid frame in the middle of a column provided in this embodiment includes:

[0044] A precast column, the precast column includes a precast concrete column 3, a steel connector 4 at the top of the precast concrete column embedded therein, and a first connecting end plate 5 embedded at the bottom of the precast concrete column. Concrete pouring holes 33 are provided in the middle of the steel connector 4 at the top of the column and the middle of the first connecting end plate 5. The steel connector 4 at the top of the lower layer is fixedly connected to the first connecting end plate of the adjacent upper layer. Specifically, through holes 34 are provided around the steel connector 4 at the top of the column and the first connecting end plate. The through holes of the steel connector at the top of the column correspond to the through holes of the first connecting end plate one by one, and the steel connector 4 at the top of the column and the first connecting end plate 5 are fixedly connected by bolts 36 passing through the through holes;

[0045] A precast beam, the precast beam includes a precast concrete beam 1 and a steel connector 2 at the end of the precast concrete beam embedded therein; the steel connector 4 at the top of the column is fixedly connected to the steel connector 2 at the end of the beam.

[0046] In this embodiment, the beam end steel connector 2 includes an H-shaped steel 6 and a beam end steel plate 7. The cross-section of the H-shaped steel 6 is I-shaped, and is composed of a web fixedly connected to an upper and lower flange. A through hole 34 is opened at one end of the web and the upper and lower flanges; one side of the beam end steel plate 7 is fixedly connected to the H-shaped steel 6, and the other side is tightly attached to the precast concrete beam 1 and fixedly connected to a shear key 8. At the same time, the side surface is also welded with a beam longitudinal reinforcement 9, and beam stirrups 10 are arranged at intervals along the length direction of the beam longitudinal reinforcement. Near the shear key 8, the beam stirrups 10 are densely arranged, and then the precast concrete beam 1 is cast.

[0047] The column top steel connector 4 is fixedly connected to the third connection end plate 12, the first rectangular steel pipe 11 and the second connection end plate 13 in sequence from bottom to top along the axial direction of the prefabricated column; concrete pouring holes 33 are opened in the middle of the second connection end plate 13 and the third connection end plate 12, and through holes 34 are opened around the second connection end plate 13. The through holes of the first connection end plate correspond to the through holes of the second connection end plate one by one and are fixedly connected by bolts.

[0048] The second connecting end plate 13 and the third connecting end plate 12 are vertically provided with column end stiffening ribs 32 at the fixed connection with the first rectangular steel tube 11; the first upper transverse diaphragm 14 and the first lower transverse diaphragm 15 are perpendicular to the first rectangular steel tube 11, and are fixedly connected to the inner wall thereof on all sides, and the middle part of the first upper transverse diaphragm 14 and the first lower transverse diaphragm 15 is provided with concrete pouring holes 33, and through holes 34 are provided on all sides; the first connecting end plate 5 and the third connecting end plate 12 are fixedly connected with a column end shear key 16 on one side located in the precast concrete column 3, and the column end shear key 16 is in the shape of a steel tube.

[0049] The outer side wall of the first rectangular steel tube 11 is fixedly connected to an H-shaped short steel corbel 17, the cross section of the H-shaped short steel corbel 17 is I-shaped, and the upper and lower flanges are fixedly connected by a web; the first upper transverse diaphragm 14 and the first lower transverse diaphragm 15 are respectively flush with the upper and lower flanges of the H-shaped short steel corbel 17; the upper and lower flanges and the web of the H-shaped short steel corbel 17 are provided with through holes 34; the through holes of the H-shaped short steel corbel correspond one by one to the through holes of the H-shaped steel and are fixedly connected by bolts.

[0050] The two ends of the column longitudinal reinforcement 19 are welded to the first connection end plate 5 and the third connection end plate 12 respectively, and column stirrups 20 are arranged at intervals along the length direction of the column longitudinal reinforcement, and the column stirrups 20 are densely arranged near the column end shear key 16; a channel is arranged in the center of the precast concrete column 3, and a post-cast hole 18 is formed at the channel during pouring. The shape and size of the post-cast hole 18 can be set according to actual conditions, and a steel cage can be inserted into the interior according to the stress conditions; the post-cast hole 18 passes through the middle of the column end shear key 16, and is connected to the inside of the first rectangular steel pipe 11 through the concrete pouring holes 33 of the first connection end plate 5, the second connection end plate 13 and the third connection end plate 12.

[0051] The on-site connection between precast columns is realized by bolt connection between the first connection end plate 5 and the corresponding third connection end plate 12. Then, a steel reinforcement cage or section steel is inserted and fixed inside the post-cast hole 18. The post-cast concrete is poured into the post-cast hole 18 through a conduit. The post-cast hole 18 and the inside of the first rectangular steel pipe 11 are filled with the post-cast concrete. The post-cast concrete includes materials such as self-compacting concrete, grouting material, and high-slump concrete, but is not limited thereto. The on-site connection between the precast beam and the precast column is realized by bolt connection between the short steel bracket 17 of H-shaped steel and the H-shaped steel 6.

[0052] In some specific applications, such as Figure 6 As shown, the steel connector 2 at the beam end is the H-shaped steel 21 at the beam end. The cross-section of the H-shaped steel 21 at the beam end is in the shape of an I-beam, and the upper and lower flanges are fixedly connected by a web. Part of the H-shaped steel 21 at the beam end is embedded in the precast concrete beam, and is divided into an embedded part 37 of the H-shaped steel at the beam end and a protruding part 38 of the H-shaped steel at the beam end. The longitudinal bars of the beam are welded to the upper and lower flanges of the embedded part 37 of the H-shaped steel at the beam end. Studs 35 are provided on the embedded part 37 of the H-shaped steel at the beam end. Through holes 34 are provided on the protruding part 38 of the H-shaped steel at the beam end.

[0053] It can be understood that: in some specific applications, different from Figure 4 As shown, at one end of the first connection end plate 5 and the third connection end plate 12 inside the precast concrete column 3, a second rectangular steel pipe 25 is fixedly connected, and the column longitudinal bar 19 is lap-welded to the side wall of the second rectangular steel pipe 25. Figure 7

[0054] In some specific applications, such as Figure 8 As shown, along the axial direction of the precast column, post-cast holes 18 are reserved at the upper and lower ends of the precast concrete column 3 respectively, with a height of about 1 / 3 of the height of the precast concrete column 3. The post-cast holes 18 do not penetrate the precast concrete column 3, and a steel reinforcement cage 39 with a corresponding height can be inserted inside according to the actual situation. Perpendicular to the axial direction of the precast column, a number of perfusion holes 40 are reserved on the precast concrete column 3 within the height range of the post-cast holes 18, and the perfusion holes 40 communicate with the post-cast holes 18.

[0055] Figure 9 In some specific applications, such as As shown, perpendicular to the axial direction of the precast column, the first rectangular steel pipe 11 has the same width as the precast concrete column 3. The first connection end plate 5 and the second connection end plate 13 expand laterally and protrude from the precast concrete column 3. The bolts 36 are located outside the precast concrete column 3 and are arranged along the periphery of the precast concrete column 3 to fixedly connect the first connection end plate 5 and the second connection end plate 13. The column end stiffeners 32 at the third connection end plate 12 are arranged along the inner periphery of the first rectangular steel pipe 11; or the second connection end plate 13 is retracted laterally, and the bolts 36 are arranged along the inner periphery of the precast concrete column 3.

[0056] Embodiment 2

[0057] In another embodiment provided by the present utility model, the connection method between the precast beam and the precast column is changed from bolt connection to bolt-welding connection. As shown in Figures 10 to 11 the figure, the flange section of the steel connector 2 at the beam end is changed according to actual needs. For example, the flange at one end of the steel connector 2 at the beam end is horizontally widened to form a widened flange H-beam 22. Another example is that the flange in the middle of the steel connector 2 at the beam end is horizontally and circularly weakened to form a weakened flange H-beam 23. Or a steel plate is fixedly connected to the top end of the flange at the beam end of the steel connector 2 to form an additional steel plate H-beam 24. They are bolt-welded to the steel connector 4 at the top of the column on site.

[0058] Embodiment 3

[0059] In another embodiment provided by the present utility model, the difference from the Figure 10 embodiment is as shown in Figures 12 to 13 the figure. The steel connector at the top of the column is fixedly connected with a third connection end plate 12, a lower rectangular steel pipe 26, a second lower transverse partition 29, a middle rectangular steel pipe 27, a second upper transverse partition 30, an upper rectangular steel pipe 28 and a second connection end plate 13 in sequence along the axial direction of the precast column from bottom to top. Concrete pouring holes 33 are provided in the middle of the third connection end plate 12, the second lower transverse partition 29, the second upper transverse partition 30 and the second connection end plate 13. Through holes 34 are provided around the second connection end plate. Column end stiffeners 32 are vertically provided at the fixed connection between the second connection end plate 13 and the upper rectangular steel pipe 28 and at the fixed connection between the third connection end plate 12 and the lower rectangular steel pipe 26. A connecting web 31 is vertically provided on the side wall of the middle rectangular steel pipe 27. The connecting web 31 is bolt-connected to the web of the steel connector 2 at the beam end. The second upper transverse partition 30 and the second lower transverse partition 29 are respectively flush with the upper and lower flanges of the steel connector 2 at the beam end and are welded and fixed.

[0060] The present utility model also provides a construction method for a steel-connected beam-column joint of a post-cast hybrid frame in the middle of a column, including the following steps:

[0061] Step 1: Fabricate the steel connector 4 at the top of the precast concrete column 3 embedded, the first connection end plate 5 embedded at the bottom end of the precast concrete column 3, and the steel connector 2 at the end of the precast concrete beam 1. Respectively bind the column stirrups 20, column longitudinal bars 19, beam stirrups 10 and beam longitudinal bars 9 to form a precast concrete column steel reinforcement cage and a precast concrete beam steel reinforcement cage. Bind the steel reinforcement cage 39 arranged in the post-cast hole 18. Then, weld the two ends of the column longitudinal bars 19 of the precast concrete column steel reinforcement cage to the steel connector 4 at the top of the column and the first connection end plate (5) respectively. Weld the beam longitudinal bars 9 of the precast concrete beam steel reinforcement cage to the steel connector at the beam end. And embed and weld the bolts 36 in the bolt holes of the first connection end plate 5.

[0062] Step 2: Formwork is erected for the parts where concrete needs to be poured, and ducts are arranged according to the size of the post-cast holes 18 designed at the middle position of the cross-section of the precast concrete column 3. Then, concrete pouring and steam curing are respectively carried out for the precast concrete column body 3 and the precast concrete beam body 1 until the concrete reaches the preset strength value, thereby forming precast columns and precast beams;

[0063] Step 3: On-site installation of precast columns: Use a crane to first lift and align the precast upper and lower columns at the designated position, bolt-connect the column top steel connectors 4 embedded in the precast concrete lower column with the first connection end plate 5 embedded in the precast concrete upper column. Then, insert and fix the steel reinforcement cage 39 into the post-cast hole 18 of the precast concrete column, and conduct on-site concrete pouring through the post-cast hole 18. When pouring, insert the conduit into the post-cast hole 18 to ensure that there is a certain drop within the allowable free fall range specified by the code during concrete pouring. Gradually pull out the conduit upward while pouring to fill the post-cast hole 18 of the precast concrete column and the inside of the column top steel connector 4 with concrete, completing the connection and installation of the precast column;

[0064] Step 4: On-site installation of precast beams: Use a crane to lift the precast beam to the designated position. According to the specific embodiment, bolt-connect the beam end steel connector 2 with the H-shaped steel short steel bracket 17 of the column top steel connector 4, or perform bolt-welding connection between the beam end steel connector 2 and the side wall of the rectangular steel pipe of the column top steel connector 4 to complete the connection and installation of the precast beam and the precast column.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A post-cast hybrid frame steel connection beam-column node in the middle of a column, characterized in that: include: A precast column, wherein the precast column comprises a precast concrete column, a column top steel connector embedded in the top of the precast concrete column, and a first connection end plate embedded in the bottom of the precast concrete column, a concrete pouring hole is provided in the middle of the column top steel connector and the middle of the first connection end plate, a post-casting hole connected to the concrete pouring hole is provided in the center of the precast concrete column, and the column top steel connector of the lower layer is fixedly connected to the first connection end plate of the adjacent upper layer by bolts; the precast concrete column is provided with column longitudinal reinforcement and column stirrups arranged at intervals along the length direction of the column longitudinal reinforcement; A precast beam, the precast beam comprising a precast concrete beam and a beam end steel connector embedded in the end of the precast concrete beam, the column top steel connector is fixedly connected to the beam end steel connector; the precast concrete beam is provided with beam longitudinal reinforcement and beam stirrups arranged at intervals along the length direction of the beam longitudinal reinforcement.

2. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 1 is characterized in that: The side wall of the column top steel connector is fixedly connected with an H-shaped steel short steel corbel, and the beam end steel connector includes a fixedly connected H-shaped steel and a beam end steel plate; the H-shaped steel short steel corbel is fixedly connected to the H-shaped steel by bolts; the beam end steel plate is tightly attached to the end of the precast concrete beam, and a shear key is arranged in the precast concrete beam, and the shear key and the beam longitudinal reinforcement are fixedly connected to the beam end steel plate.

3. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 2 is characterized in that: The steel connecting piece at the top end of the column is fixedly connected to the third connecting end plate, the first rectangular steel pipe, and the second connecting end plate in sequence from bottom to top along the axial direction of the prefabricated column; the middle parts of the second connecting end plate and the third connecting end plate are provided with concrete pouring holes, and the second connecting end plate is fixedly connected to the corresponding first connecting end plate by bolts; the second connecting end plate and the third connecting end plate are vertically provided with column end stiffening ribs at the fixed connection with the first rectangular steel pipe.

4. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 3 is characterized in that: The first rectangular steel tube is internally fixedly provided with a first upper transverse diaphragm and a first lower transverse diaphragm at intervals, and the middle parts of the first upper transverse diaphragm and the first lower transverse diaphragm are provided with concrete pouring holes; the first connecting end plate and the third connecting end plate are fixedly connected to the precast concrete column on one side with a column end shear key.

5. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 4 is characterized in that: The post-cast hole passes through the middle part of the column end shear key, and is connected to the interior of the first rectangular steel tube through the concrete pouring holes of the first connecting end plate, the second connecting end plate and the third connecting end plate, and the post-cast concrete is poured through the post-cast hole and the interior of the first rectangular steel tube; the two ends of the column longitudinal reinforcement are respectively welded to the first connecting end plate and the third connecting end plate, and the column stirrups are densely arranged near the column end shear key.

6. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 1 is characterized in that: The beam end steel connector is a beam end H-shaped steel, and the beam end H-shaped steel portion is embedded in the precast concrete beam, and is divided into a beam end H-shaped steel embedded portion and a beam end H-shaped steel protruding portion; The longitudinal reinforcement of the beam is lap-welded to the upper and lower flanges of the embedded part of the H-shaped steel at the beam end, and the embedded part of the H-shaped steel at the beam end is provided with studs; the protruding part of the H-shaped steel at the beam end is fixedly connected to the steel connecting piece at the top end of the column by bolts.

7. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 2 is characterized in that: A steel plate is fixedly connected to the top end of the flange of the H-shaped steel.

8. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 3 is characterized by: The third connecting end plate and the first connecting end plate are fixedly connected to a second rectangular steel pipe at one end of the precast concrete column, and the column longitudinal reinforcement is overlap-welded to the side wall of the second rectangular steel pipe.

9. The post-cast hybrid frame steel connection beam-column node in the middle of the column according to claim 3 is characterized in that: The steel connecting piece at the top end of the column is fixedly connected to the third connecting end plate, the lower rectangular steel tube, the second lower transverse diaphragm, the middle rectangular steel tube, the second upper transverse diaphragm, the upper rectangular steel tube and the second connecting end plate in sequence from bottom to top along the axial direction of the prefabricated column; the middle parts of the third connecting end plate, the second lower transverse diaphragm, the second upper transverse diaphragm and the second connecting end plate are all provided with concrete pouring holes; the second connecting end plate and the third connecting end plate are respectively vertically provided with column end stiffening ribs at the fixed connections with the upper rectangular steel tube and the lower rectangular steel tube; the side wall of the middle rectangular steel tube is vertically provided with a connecting web, and the connecting web is fixedly connected to the beam end steel connecting piece by bolts; the second upper transverse diaphragm and the second lower transverse diaphragm are respectively flush with the upper and lower flanges of the beam end steel connecting piece and are welded.

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