A precast steel-reinforced concrete column connection structure and its construction method

Abstract

A precast steel reinforced concrete column connection structure and its construction method, including two precast steel reinforced concrete columns and a preset structural member for the horizontal member. The preset structural member for the horizontal member is located at the top of the lower column. The precast steel reinforced concrete column includes a column steel member and column concrete. The column steel bars include longitudinal steel bars and transverse steel bars. The longitudinal steel bars are divided into longitudinal continuous steel bars and longitudinal discontinuous steel bars according to the stress state. The longitudinal continuous steel bars are arranged at the corner areas of the column body. The column steel member is longitudinally located inside the steel bar cage. In the present invention, exhaust holes are provided in the upper column, which is convenient for the concrete to be poured in the connection area and compacted at the bottom of the upper column, enabling the concrete of the upper column and the connection area to bear force together. The steel bars in the column are divided according to the stress form, which is used for welding the steel member during construction, improving the construction quality of the steel member, forming the co - bearing of the steel member and the reinforced concrete. Floor reserved members and beam reserved members are provided on the column, enabling the floor and the beam to be anchored to the column respectively, avoiding slab joints.

Description

Technical Field

[0001] The present invention belongs to the field of precast steel - reinforced concrete, and particularly relates to a connection structure of precast steel - reinforced concrete columns and a construction method thereof. Background Technique

[0002] At present, in the vertical connection construction of precast steel - reinforced concrete column members, the cast - in - place connection area between columns is usually set in the joint area of the floor slab and the beam. In actual projects, there are often problems with difficult quality control:

[0003] First, the cast - in - place concrete at the bottom of the original precast steel - reinforced concrete column is not compacted, resulting in difficulty for the components in the joint area to jointly bear the load and difficulty in meeting the design requirements of "strong joints and weak components" in the structure.

[0004] Second, the steel bars and steel skeletons of precast steel - reinforced concrete columns are connected in the joint area. At this time, the close spacing of the steel bars in the joint area will cause difficulty in welding the steel skeletons between columns when connecting the steel bars, and it is difficult to ensure the construction quality after the construction spaces cross.

[0005] In actual projects, the diameter of column steel bars is usually more than 20mm, the setting spacing is not more than 200mm, the operating space is narrow, it is difficult to place the members during on - site hoisting, it is difficult to insert the gusset plates for connecting the steel skeletons, it is also difficult to tighten the bolts of the gusset plates during construction, and it is difficult to connect the steel bars with the steel sleeves, resulting in the inability of the post - cast concrete to be combined tightly with the bottom surface of the upper column and the inability to ensure the bearing capacity of the connection in the joint area.

[0006] Third, the floor slab steel bars need to be disconnected at the precast columns in the joint area, causing the floor slab to be prone to cracking and generating slab joints at the connection position of the precast columns. Summary of the Invention

[0007] The purpose of the present invention is to provide a connection structure of precast steel - reinforced concrete columns and a construction method thereof, which aims to solve the technical problems of non - compact casting of the bottom concrete of columns, difficult connection of steel skeletons, and easy cracking and generation of slab joints due to the disconnection of floor slab steel bars at the column position during the vertical connection construction of existing precast steel - reinforced concrete column members.

[0008] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions:

[0009] A connection structure of precast steel - reinforced concrete columns and a construction method thereof, including two vertically - connected precast steel - reinforced concrete columns and a horizontal member preset structure fixedly connected to the precast steel - reinforced concrete columns. The two precast steel - reinforced concrete columns are respectively an upper column and a lower column. A connection area is provided between the bottom surface of the upper column and the top surface of the lower column. Connection area steel bars are provided in the connection area and a connection area filling material is cast. The horizontal member preset structure is located at the top of the lower column.

[0010] The precast steel-reinforced concrete column includes a column body, which consists of a column body steel member and column body concrete covering the column body steel member. The column body steel member includes a column body steel skeleton and column body steel bars. The column body steel bars include longitudinal steel bars and transverse steel bars. The transverse steel bars and longitudinal steel bars form a steel bar cage. The longitudinal steel bars are classified according to the stress state into longitudinal continuous steel bars and longitudinal discontinuous steel bars. The longitudinal continuous steel bars are arranged at the corner areas of the column body.

[0011] The column body steel skeleton is longitudinally located inside the steel bar cage. The column body steel skeleton of the lower column extends upward from the top surface of the lower column into the connection area, and the column body steel skeleton of the upper column extends downward from the bottom surface of the upper column into the connection area. The top end of the column body steel skeleton of the lower column is fixedly connected to the bottom end of the column body steel skeleton of the upper column in the connection area. The column body steel skeleton is a section steel or a welded steel member.

[0012] The longitudinal continuous steel bars include integral through steel bars and / or fixed connection steel bars according to the number of construction measure points.

[0013] The fixed connection steel bars of the lower column extend upward from the top surface of the lower column into the connection area, and the fixed connection steel bars of the upper column extend downward from the bottom surface of the upper column into the connection area. The fixed connection steel bars of the upper column and the lower column are fixedly connected in the connection area.

[0014] The connection horizontal plane of the column body steel skeleton in the connection area is vertically staggered from the connection horizontal plane of the fixed connection steel bars in the connection area.

[0015] The column body steel skeleton is a section steel or a welded steel member, including edge flange plates and a central web. The longitudinal discontinuous steel bars are arranged in the middle position of the column body except at the corners, within the range corresponding to the side close to the edge flange plates of the column body steel skeleton. The longitudinal discontinuous steel bars of the lower column extend upward from the top surface of the lower column into the connection area, and the longitudinal discontinuous steel bars of the upper column extend downward from the bottom surface of the upper column into the connection area. The longitudinal discontinuous steel bars of the upper column and the lower column are not connected or non-force-transferring intersecting in the connection area. The filler in the connection area covers the column body steel skeleton and column body steel bars extending into this area.

[0016] The cross-sectional shape of the central web is a straight shape or a cross shape. The cross-sectional shape formed by the edge flange plates and the central web is an I shape, an H shape, a king shape, a T shape, or the intersection of two I shapes.

[0017] End plates are fixedly connected to the end faces of the column body steel skeleton. A horizontal connection upper end plate is fixedly connected to the bottom end face of the column body steel skeleton of the upper column, and a horizontal connection lower end plate is fixedly connected to the top end face of the column body steel skeleton of the lower column. The horizontal connection upper end plate and the horizontal connection lower end plate are closely attached and fixedly connected in the connection area.

[0018] The preset structural members of the horizontal member include the floor slab reserved members. The floor slab reserved members are the horizontally reserved steel bars of the floor slab. The inner half of the horizontally reserved steel bars of the floor slab horizontally penetrates into the top of the lower column. There are two upper and lower layers of the horizontally reserved steel bars of the floor slab, namely the upper reserved bars of the floor slab and the lower reserved bars of the floor slab. The outer halves of the upper reserved bars of the floor slab and the lower reserved bars of the floor slab are arranged corresponding to the upper layer steel bars and the lower layer steel bars of the floor slab at the position of the lower column and are fixedly connected respectively.

[0019] Or the floor slab reserved member is a pre-embedded steel connecting member, and the end of the floor slab is fixedly connected to the pre-embedded steel connecting member.

[0020] The preset structural members of the horizontal member further include beam reserved members. The beam reserved members are arranged below the floor slab reserved members and at the position corresponding to the beam. The end members of the beam are fixedly connected to the beam reserved members. The beam reserved members are fixedly connected to the outside of the edge flange plate of the column steel skeleton.

[0021] The beam reserved members protrude from the side surface of the column concrete. The beam reserved members are steel sections or welded steel members, including beam flange plates and beam webs. At the position corresponding to the beam flange plates, beam stiffening plates with the same width as the beam flange plates are fixedly connected between the included angles formed by the edge flange plates and the central web. The beam stiffening plates enable the two side beam flange plates to transfer force.

[0022] An L-shaped exhaust duct is provided at the bottom of the upper column. The bottom end of the exhaust duct is arranged on the bottom surface of the upper column, and the top end of the exhaust duct is arranged on the side surface of the upper column. The exhaust duct is communicated with the connection area. One exhaust duct or more than two exhaust ducts are circumferentially arranged at intervals at the bottom of the upper column.

[0023] A grouting duct is provided in the upper column.

[0024] The grouting duct is arranged vertically along the entire length of the column body. The top end of the grouting duct is arranged on the top surface of the upper column, and the bottom end of the grouting duct is arranged on the bottom surface of the upper column. The bottom end of the grouting duct is communicated with the connection area. One grouting duct or more than two grouting ducts are circumferentially arranged at intervals in the upper column.

[0025] Or the grouting duct is arranged in an L-shape at the bottom of the column body. The top end of the grouting duct is arranged on the top surface of the lower column, and the bottom end of the grouting duct is arranged on the side surface of the lower column. The top end of the grouting duct is communicated with the connection area. One grouting duct or more than two grouting ducts are circumferentially arranged at intervals at the top of the lower column.

[0026] A construction method for a connecting structure of a precast steel reinforced concrete column. The construction steps are as follows:

[0027] Step 1, prefabricate precast steel reinforced concrete columns in the factory, including upper columns and lower columns.

[0028] Step 2: First, construct the lower column, and then hoist the upper column above the lower column and temporarily support it to form a connection area.

[0029] Step 3: Horizontally bend the longitudinal discontinuous steel bars in the connection area to form an installation space in the connection area.

[0030] Step 4: In the installation space obtained in Step 3, fixedly connect the end plates of the upper column and the lower column in the connection area.

[0031] Step 5: Straighten the longitudinal discontinuous steel bars in the connection area.

[0032] Step 6: Connect the fixed connection steel bars in the longitudinal continuous steel bars of the upper column and the lower column into one body in the connection area.

[0033] Step 7: Fill the connection area through the grouting duct until the connection area filling material also flows out from the exhaust duct.

[0034] Step 8: Respectively and fixedly connect the upper layer steel bars of the floor slab and the lower layer steel bars of the floor slab with the reserved steel bars on the upper part of the lower column and the reserved steel bars under the floor slab; or fixedly lap the end of the floor slab on the embedded steel connecting piece.

[0035] Step 9: Fixedly connect the beam reserved member with the beam.

[0036] Compared with the prior art, the present invention has the following features and beneficial effects:

[0037] By arranging an exhaust hole on the upper column, the present invention discharges the air between the concrete in the connection area and the upper column, facilitating the pouring of the concrete in the connection area to be dense at the bottom of the upper column, so that the upper column and the concrete in the connection area jointly bear the force.

[0038] By classifying the steel bars in the column according to the stress form, the present invention divides them into continuous steel bars and discontinuous steel bars. The discontinuous steel bars are arranged corresponding to the steel bone flange and are used for welding the steel bone during construction, improving the construction quality of the steel bone and forming the co - bearing of the steel bone and the reinforced concrete.

[0039] By arranging a floor slab reserved member and a beam reserved member on the column, the present invention enables the floor slab and the beam to be respectively anchored to the column, reducing or avoiding the cracking in the slab joint area. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The following further describes the present invention in detail with reference to the drawings.

[0041] Figure 1 It is a schematic diagram of the first embodiment of the connection structure of the present invention.

[0042] Figure 2 It is Figure 1 A schematic cross - sectional view of the position of the beam reserved member.

[0043] Figure 3 It is a schematic diagram of the connection between the connection structure of the present invention and the beam-slab.

[0044] Figure 4 It is a schematic diagram of the second embodiment of the connection structure of the present invention.

[0045] Figure 5 It is a schematic diagram of the third embodiment of the connection structure of the present invention.

[0046] Reference numerals: 1 - upper column, 11 - exhaust duct, 12 - grouting duct, 2 - lower column, 3 - connection area, 4 - connection area filler, 5 - column concrete, 6 - column steel skeleton, 61 - edge flange plate, 62 - central web plate, 63 - upper horizontal connection end plate, 64 - lower horizontal connection end plate, 7 - column steel bars, 71 - longitudinal steel bars, 72 - transverse steel bars, 711 - longitudinal continuous steel bars, 712 - longitudinal discontinuous steel bars, 8 - reserved horizontal bars of floor slab, 81 - reserved bars on the upper part of floor slab, 82 - reserved bars on the lower part of floor slab, 9 - reserved beam member, 91 - beam flange plate, 92 - beam web plate, 93 - beam stiffening plate, 101 - upper layer steel bars of floor slab, 102 - lower layer steel bars of floor slab, 103 - end member of beam. Detailed implementation manners

[0047] Refer to the first embodiment Figure 1-2 As shown, a precast steel reinforced concrete column connection structure and its construction method include two vertically connected precast steel reinforced concrete columns and a horizontal member preset structure fixedly connected to the precast steel reinforced concrete columns. The two precast steel reinforced concrete columns are respectively an upper column 1 and a lower column 2. A connection area 3 is provided between the column bottom surface of the upper column 1 and the column top surface of the lower column 2. The connection area 3 is provided with connection area steel bars and is filled with a connection area filler 4. The horizontal member preset structure is located at the top of the lower column 2.

[0048] The precast steel reinforced concrete column includes a column body. The column body includes a column steel member and column concrete 5 covering the column steel member. The column steel member includes a column steel skeleton 6 and column steel bars 7. The column steel bars 7 include longitudinal steel bars 71 and transverse steel bars 72. The transverse steel bars 72 and the longitudinal steel bars 71 form a steel bar cage. The longitudinal steel bars 71 are divided into longitudinal continuous steel bars 711 and longitudinal discontinuous steel bars 712 according to the stress state. The longitudinal continuous steel bars 711 are arranged at the corner area positions of the column body. The corner area refers to the range within a distance not greater than 45% of the column side length from the corner side line. Refer to Figure 2 As shown, the longitudinal continuous steel bars 711 refer to the solid black steel bars in the figure. The longitudinal discontinuous steel bars 712 refer to the hollow steel bars in the figure.

[0049] The longitudinal continuous steel bars 711 include integral through steel bars and / or fixed connection steel bars according to the number of construction measure points. The integral through steel bars refer to continuous load-bearing steel bars made of a single steel bar, and the fixed connection steel bars refer to steel bars that are disconnected in the connection area 3 but can still be continuously load-bearing through connection. The connection methods here include steel bar lapping, cold extrusion sleeve connection, welding, etc. For Example 1, see Figure 1 As described, the longitudinal continuous steel bars 711 are fixed connection steel bars.

[0050] The column steel skeleton 6 is longitudinally located inside the steel reinforcement cage. The column steel skeleton 6 of the lower column 2 extends upward out of the column top surface of the lower column 2 and enters the connection area 3. The column steel skeleton 6 of the upper column 1 extends downward out of the column bottom surface of the upper column 1 and enters the connection area 3. The top end of the column steel skeleton 6 of the lower column 2 is fixedly connected to the bottom end of the column steel skeleton 6 of the upper column 1 in the connection area 3. The column steel skeleton 6 is a section steel or a welded steel member. The column steel skeleton 6 is a section steel or a welded steel member, including an edge flange plate 61 and a central web plate 62. The cross-sectional shape of the central web plate 62 is a straight shape or a cross shape, and the cross-sectional shape formed by the edge flange plate 61 and the central web plate 62 is an I shape, an H shape, a king shape, a T shape, or two I shapes intersecting. In this embodiment, the central web plate 62 is a cross shape, and the edge flange plate 61 is perpendicular to the central web plate 62, forming two I shapes intersecting.

[0051] End plates are fixedly connected to the end faces of the column steel skeleton 6. A horizontal connection upper end plate 63 is fixedly connected to the bottom end face of the column steel skeleton 6 of the upper column 1, and a horizontal connection lower end plate 64 is fixedly connected to the top end face of the column steel skeleton 6 of the lower column 2. The horizontal connection upper end plate 63 and the horizontal connection lower end plate 64 are closely attached and fixedly connected in the connection area 3. The thickness of the end plates is not less than 4 mm, the width of the end plates exceeding the edge flange plate 61 of the column steel skeleton 6 is not less than 1 mm, and exhaust holes are provided on the end plates.

[0052] In other embodiments, stud bolts or shear-resistant members may also be provided on the surface of the column steel skeleton 6 and welded to the longitudinal steel skeleton. Ear plates may also be welded to the surface of the column steel skeleton 6, and holes are provided on the ear plates.

[0053] The fixed connection steel bars of the lower column 2 extend upward out of the column top surface of the lower column 2 and enter the connection area 3. The fixed connection steel bars of the upper column 1 extend downward out of the column bottom surface of the upper column 1 and enter the connection area 3. The fixed connection steel bars of the upper column 1 and the lower column 2 are fixedly connected in the connection area 3. The connection horizontal plane of the column steel skeleton 6 in the connection area 3 is vertically offset from the connection horizontal plane of the fixed connection steel bars in the connection area 3.

[0054] The longitudinal discontinuous steel bars 712 are arranged in the middle position of the column body except at the corners, in the range corresponding to the side close to the edge flange plate 61 of the column steel skeleton 6. See Figure 2As shown, in this embodiment, there are two longitudinal discontinuous steel bars 712 on each side corresponding to the edge flange plate 61.

[0055] The longitudinal discontinuous steel bars 712 of the lower column 2 extend upward from the top surface of the lower column 2 into the connection area 3, and the longitudinal discontinuous steel bars 712 of the upper column 1 extend downward from the bottom surface of the upper column 1 into the connection area 3. The longitudinal discontinuous steel bars 712 of the upper column 1 and the lower column 2 are not connected or non-force-transferring intersecting in the connection area 3. The connection area filler 4 covers the column steel skeleton 6 and the column steel bars 7 extending into this area. The overlapping length of the longitudinal discontinuous steel bars 712 of the upper column 1 and the lower column 2 in the connection area 3 is not greater than the lap length required by the current concrete code, such as 30d, 35d, 40d, etc., where d is the diameter of the steel bar.

[0056] The preset structural members of the horizontal member include floor slab reserved members. The floor slab reserved member is the floor slab reserved horizontal bar 8. The inner half of the floor slab reserved horizontal bar 8 horizontally penetrates into the top of the lower column 2. The floor slab reserved horizontal bar 8 has two layers, namely the upper floor slab reserved bar 81 and the lower floor slab reserved bar 82. The outer halves of the upper floor slab reserved bar 81 and the lower floor slab reserved bar 82 are respectively fixed and connected to the upper layer steel bars 101 and the lower layer steel bars 102 of the floor slab at the setting positions in the lower column 2.

[0057] In this embodiment, the floor slab reserved horizontal bar 8 is adopted. Or in other embodiments, the floor slab reserved member is a pre-embedded steel connecting piece, and the end of the floor slab is fixedly connected to the pre-embedded steel connecting piece.

[0058] The preset structural members of the horizontal member further include beam reserved members 9. The beam reserved members 9 are arranged below the floor slab reserved members and at the positions corresponding to the beams. The end members 103 of the beams are fixedly connected to the beam reserved members 9. The beam reserved members 9 are fixedly connected to the outside of the edge flange plate 61 of the column steel skeleton 6.

[0059] The beam reserved member 9 extends out of the side surface of the column concrete 5. The beam reserved member 9 is a steel section or a welded steel member, including a beam flange plate 91 and a beam web 92. A beam stiffening plate 93 with the same width as the beam flange plate 91 is fixedly connected between the positions corresponding to the beam flange plate 91 and the included angle formed by the edge flange plate 61 and the central web 62. The beam stiffening plate 93 enables the two side beam flange plates 91 to transfer force.

[0060] See Figure 3 As shown, it can be seen from the figure that in a single column, the floor slab and the beam are respectively connected to the precast steel reinforced concrete column connection structure.

[0061] The bottom of the upper column 1 is provided with an L-shaped exhaust duct 11. The bottom end of the exhaust duct 11 is arranged on the bottom surface of the upper column 1, and the top end of the exhaust duct 11 is arranged on the side surface of the upper column 1. The exhaust duct 11 communicates with the connection area 3. The exhaust duct 11 is provided with one or more than two circumferentially spaced apart at the bottom of the upper column 1. The top opening position of the exhaust duct 11 does not exceed half of the total height of the upper column 1, and the diameter of the exhaust duct 11 is not less than 5 mm.

[0062] See Embodiment 2 Figure 4 As shown, different from Embodiment 1, a grouting duct 12 is provided in the upper column 1. The grouting duct 12 is arranged vertically through the entire length of the column body. The top end of the grouting duct 12 is arranged on the top surface of the upper column, and the bottom end of the grouting duct 12 is arranged on the bottom surface of the upper column. The bottom end of the grouting duct 12 communicates with the connection area 3. The grouting duct 12 is provided with one or more than two circumferentially spaced apart in the upper column 1.

[0063] See Embodiment 3 Figure 5 As shown, different from Embodiment 2, the grouting duct 12 is arranged in an L shape at the bottom of the column body. The top end of the grouting duct 12 is arranged on the top surface of the lower column 2, and the bottom end of the grouting duct 12 is arranged on the side surface of the lower column 2. The top end of the grouting duct 12 communicates with the connection area 3. The grouting duct 12 is provided with one or more than two circumferentially spaced apart at the top of the lower column 2.

[0064] The column body can also be vertically provided with a post-cast hole, and the diameter of the post-cast hole is not less than 30 mm; concrete or grouting material is poured into the post-cast hole; steel bars can be arranged in the post-cast hole.

[0065] The construction method of this precast steel reinforced concrete column connection structure is as follows:

[0066] Step 1, prefabricate the precast steel reinforced concrete column in the factory, including the upper column 1 and the lower column 2;

[0067] Step 2, first construct the lower column 2, and then hoist the upper column 1 above the lower column 2 and temporarily support it to form the connection area 3;

[0068] Step 3, horizontally bend the longitudinal discontinuous steel bars 712 in the connection area 3 to form an installation space in the connection area 3;

[0069] Step 4, in the installation space of Step 3, fixedly connect the end plates of the upper column 1 and the lower column 2 in the connection area 3;

[0070] Step 5, straighten the longitudinal discontinuous steel bars 712 in the connection area 3;

[0071] Step 6, connect the fixed connection steel bars in the longitudinal continuous steel bars 711 of the upper column 1 and the lower column 2 into one body in the connection area 3;

[0072] Step Seven: Fill the connection area 3 through the grouting duct 12 until the connection area filler 4 also flows out of the exhaust duct 11;

[0073] Step Eight: Fix and connect the upper steel bars of the floor slab and the lower steel bars of the floor slab to the reserved bars 81 on the floor slab and the reserved bars 82 under the floor slab of the lower column 2 respectively; or fix and lap the end of the floor slab on the embedded steel connecting piece;

[0074] Step Nine: Fix and connect the beam reserved member 9 to the beam.

Claims

1. A precast steel-reinforced concrete column connection structure, characterized in that: It includes two vertically connected precast steel-reinforced concrete columns and a horizontal member preset structure fixedly connected to the precast steel-reinforced concrete columns. The two precast steel-reinforced concrete columns are respectively the upper column (1) and the lower column (2). A connection area (3) is provided between the column bottom surface of the upper column (1) and the column top surface of the lower column (2). The connection area (3) is provided with connection area steel bars and filled with a connection area filler (4). The horizontal member preset structure is located at the top of the lower column (2), The precast steel-reinforced concrete column includes a column body. The column body includes a column body steel member and column body concrete (5) covering the column body steel member. The column body steel member includes a column body steel skeleton (6) and column body steel bars (7). The column body steel bars (7) include longitudinal steel bars (71) and transverse steel bars (72). The transverse steel bars (72) and the longitudinal steel bars (71) form a steel bar cage. The longitudinal steel bars (71) are divided into longitudinal continuous steel bars (711) and longitudinal discontinuous steel bars (712) according to the stress state. The longitudinal continuous steel bars (711) are arranged at the corner area positions of the column body, The column body steel skeleton (6) is longitudinally located inside the steel bar cage. The column body steel skeleton (6) of the lower column (2) extends upward out of the column top surface of the lower column (2) and enters the connection area (3). The column body steel skeleton (6) of the upper column (1) extends downward out of the column bottom surface of the upper column (1) and enters the connection area (3). The top end of the column body steel skeleton (6) of the lower column (2) is fixedly connected to the bottom end of the column body steel skeleton (6) of the upper column (1) in the connection area (3); The column body steel skeleton (6) is a section steel or a welded steel member, including edge flange plates (61) and a central web (62). The longitudinal discontinuous steel bars (712) are arranged in the middle position of the column body except at the corners and within the range corresponding to the side of the edge flange plate (61) of the column body steel skeleton (6).

2. The precast steel-reinforced concrete column connection structure according to claim 1, characterized in that: The longitudinal continuous steel bars (711) include integral through steel bars and / or fixed connection steel bars according to the number of construction measure points, The fixed connection steel bars of the lower column (2) extend upward out of the column top surface of the lower column (2) and enter the connection area (3). The fixed connection steel bars of the upper column (1) extend downward out of the column bottom surface of the upper column (1) and enter the connection area (3). The fixed connection steel bars of the upper column (1) and the lower column (2) are fixedly connected in the connection area (3), The connection horizontal plane of the column body steel skeleton (6) in the connection area (3) is vertically offset from the connection horizontal plane of the fixed connection steel bars in the connection area (3).

3. The precast steel-reinforced concrete column connection structure according to claim 1 or 2, characterized in that: The longitudinal discontinuous reinforcement bars (712) of the lower column (2) extend upward from the top surface of the lower column (2) into the connection zone (3), and the longitudinal discontinuous reinforcement bars (712) of the upper column (1) extend downward from the bottom surface of the upper column (1) into the connection zone (3). The longitudinal discontinuous reinforcement bars (712) of the upper column (1) and the lower column (2) are not connected or non-force-transferring intersecting in the connection zone (3). The connection zone filler (4) covers the column steel skeleton (6) and column reinforcement bars (7) extending into this area. The cross-sectional shape of the central web (62) is a straight shape or a cross shape, and the cross-sectional shape formed by the edge flange plates (61) and the central web (62) is an I shape, an H shape, a king shape, a T shape, or the intersection of two I shapes.

4. The precast steel reinforced concrete column connection structure according to claim 3, characterized in that: End plates are fixedly connected to the end surfaces of the column steel skeletons (6). A horizontal connection upper end plate (63) is fixedly connected to the bottom end surface of the column steel skeleton (6) of the upper column (1), and a horizontal connection lower end plate (64) is fixedly connected to the top end surface of the column steel skeleton (6) of the lower column (2). The horizontal connection upper end plate (63) and the horizontal connection lower end plate (64) are closely attached and fixedly connected in the connection zone (3).

5. The precast steel reinforced concrete column connection structure according to claim 4, characterized in that: The preset structural members of the horizontal member include floor slab reserved members. The floor slab reserved members are floor slab reserved horizontal reinforcement bars (8). The inner half of the floor slab reserved horizontal reinforcement bars (8) horizontally penetrates into the top of the lower column (2). The floor slab reserved horizontal reinforcement bars (8) are provided with two upper and lower layers, namely the upper floor slab reserved reinforcement bars (81) and the lower floor slab reserved reinforcement bars (82). The outer halves of the upper floor slab reserved reinforcement bars (81) and the lower floor slab reserved reinforcement bars (82) are arranged at positions corresponding to the upper layer reinforcement bars (101) and the lower layer reinforcement bars (102) of the floor slab in the lower column (2) and are respectively fixedly connected. Or the floor slab reserved member is a pre-embedded steel connecting member, and the end of the floor slab is fixedly connected to the pre-embedded steel connecting member.

6. The precast steel reinforced concrete column connection structure according to claim 5, characterized in that: The preset structural members of the horizontal member further include beam reserved members (9). The beam reserved members (9) are arranged below the floor slab reserved members and at positions corresponding to the beams. The end members (103) of the beams are fixedly connected to the beam reserved members (9). The beam reserved members (9) are fixedly connected to the outside of the edge flange plates (61) of the column steel skeletons (6). The beam reserved members (9) extend out of the side surface of the column concrete (5). The beam reserved members (9) are steel sections or welded steel members, including beam flange plates (91) and beam webs (92). Beam stiffening plates (93) with the same width as the beam flange plates (91) are fixedly connected between the positions corresponding to the beam flange plates (91) and the included angles formed by the edge flange plates (61) and the central web (62). The beam stiffening plates (93) enable force transfer between the two side beam flange plates (91).

7. The precast steel reinforced concrete column connection structure according to any one of claims 1-2, 4-6, characterized in that: The bottom of the upper column (1) is provided with an L-shaped exhaust duct (11). The bottom end of the exhaust duct (11) is arranged on the bottom surface of the upper column (1), and the top end of the exhaust duct (11) is arranged on the side surface of the upper column (1). The exhaust duct (11) communicates with the connection area (3). One or more than two exhaust ducts (11) are arranged at the bottom of the upper column (1) at intervals in the circumferential direction.

8. The precast steel reinforced concrete column connection structure according to claim 7, characterized in that: a grouting duct (12) is arranged in the upper column (1), the grouting duct (12) is arranged longitudinally and continuously along the column body. The top end of the grouting duct (12) is arranged on the top surface of the upper column, and the bottom end of the grouting duct (12) is arranged on the bottom surface of the upper column. The bottom end of the grouting duct (12) communicates with the connection area (3). One or more than two grouting ducts (12) are arranged in the upper column (1) at intervals in the circumferential direction, or the grouting duct (12) is arranged in an L shape at the bottom of the column body. The top end of the grouting duct (12) is arranged on the top surface of the lower column (2), and the bottom end of the grouting duct (12) is arranged on the side surface of the lower column (2). The top end of the grouting duct (12) communicates with the connection area (3). One or more than two grouting ducts (12) are arranged at the top of the lower column (2) at intervals in the circumferential direction.

9. A construction method for the precast steel reinforced concrete column connection structure according to claim 8, characterized in that, the construction steps are as follows: Step 1, prefabricate precast steel reinforced concrete columns in the factory, including the upper column (1) and the lower column (2); Step 2, first construct the lower column (2), and then hoist the upper column (1) above the lower column (2) and temporarily support it to form a connection area (3); Step 3, horizontally bend the longitudinal discontinuous steel bars (712) in the connection area (3) to form an installation space in the connection area (3); Step 4, in the installation space obtained in Step 3, fixedly connect the end plates of the upper column (1) and the lower column (2) in the connection area (3); Step 5, straighten the longitudinal discontinuous steel bars (712) in the connection area (3); Step 6, connect the fixed connection steel bars in the longitudinal continuous steel bars (711) of the upper column (1) and the lower column (2) into one body in the connection area (3); Step 7, fill the connection area (3) through the grouting duct (12) until the connection area filling material (4) also flows out of the exhaust duct (11); Step 8, fixedly connect the upper layer steel bars of the floor slab and the lower layer steel bars of the floor slab with the reserved steel bars (81) on the floor slab of the lower column (2) and the reserved steel bars (82) under the floor slab respectively; or fixedly lap the end of the floor slab on the embedded steel connecting piece; Step 9, fixedly connect the beam reserved member (9) with the beam.

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