Connecting joint of prefabricated reinforced concrete column and prestressed steel reinforced concrete beam and construction technology

Abstract

The invention belongs to the field of constructional engineering, and particularly relates to a connecting joint of a prefabricated reinforced concrete column and a prestressed steel reinforced concrete beam and a construction technology. The structure for connecting the joint by adopting the pi-shaped connecting piece is as follows: one end of the prestressed steel reinforced concrete beam is connected with the pi-shaped connecting piece of the prefabricated reinforced concrete column, a concrete layer is arranged at the top of the section steel at the end, the bottom of the section steel is exposed, and a vertically through bolt channel is arranged along the vertical direction; and one end of the prefabricated prestressed steel reinforced concrete beam extends between the upper web plate and the lower web plate of the pi-shaped connecting piece and is in close contact fit with the upper web plate and the lower web plate. According to the structure of the overhanging short beam-flange clamping sleeve connecting joint, an overhanging short beam is arranged at the joint of a prefabricated reinforced concrete column and a prestressed steel reinforced concrete beam, and the prefabricated reinforced concrete column is connected with the prestressed steel reinforced concrete beam through the overhanging short beam on the prefabricated reinforced concrete column; and the prestressed steel reinforced concrete beam is clamped on the flange clamping sleeve at the end part of the overhanging short beam through the flange plate at the end part.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and specifically relates to a connection node of a prefabricated reinforced concrete column and a prestressed steel concrete beam and a construction process. Background Art

[0002] Prefabricated concrete structure is one of the important development directions of building structure in my country. It is composed of prefabricated concrete components connected by reliable connection methods and assembled and installed on site to form an integral concrete structure. Prefabricated buildings solve a series of problems existing in traditional cast-in-place concrete structures, such as low production efficiency, long construction period, loss of building materials, difficult quality control, and construction environment pollution, through standardized design, factory production, and centralized installation. It improves production efficiency, shortens construction period, reduces template consumption and loss of on-site concrete, improves building quality, reduces on-site wet work, improves the construction environment, and achieves high efficiency, economy, energy saving, and environmental protection. It has significant advantages and development potential.

[0003] Compared with ordinary reinforced concrete beams, steel concrete beams can reduce the deadweight of the structure, reduce the cross-sectional size, and increase the usable space. They have the advantages of high bearing capacity, high rigidity, good earthquake resistance and fire resistance, and strong durability. They are widely used in high-rise, large-span buildings and bridge structures. Summary of the invention

[0004] The purpose of the present invention is to provide a connection node and construction process for a prefabricated reinforced concrete column and a prestressed steel concrete beam, so as to solve the problems of the steel concrete beam in the prior art, such as low crack resistance, low rigidity and insufficient durability.

[0005] The technical solution of the present invention is:

[0006] A connection node between a prefabricated reinforced concrete column and a prestressed steel concrete beam, comprising one or a combination of a π-shaped connector connection node and an extended short beam-flange sleeve connection node;

[0007] The structure of the node connection using the π-shaped connector is as follows: one end of the prestressed steel concrete beam is connected to the π-shaped connector of the precast reinforced concrete column, the top of the steel at this end is provided with a concrete layer, the bottom of the steel is exposed, and a bolt channel is provided vertically through the upper and lower webs; one end of the precast prestressed steel concrete beam extends between the upper web and the lower web of the π-shaped connector, and is in close contact with the upper web and the lower web, the bolt channel of the precast prestressed steel concrete beam is aligned with the reserved holes on the upper web and the lower web, and is fixed by a second high-strength bolt connection;

[0008] The structure of the node using an extended short beam-flange clamp connection is as follows: an extended short beam is provided at the connection between the precast reinforced concrete column and the prestressed steel concrete beam, the precast reinforced concrete column is connected to the prestressed steel concrete beam through the extended short beam thereon, the prestressed steel concrete beam is clamped in the flange clamp at the end of the extended short beam through the flange plate at the end, and the flange plate and the flange clamp are fixed by a third high-strength bolt.

[0009] The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam adopts a π-shaped connector to connect the node. The π-shaped connector is an integrated structure of a vertical flange and horizontal upper and lower webs, wherein: the upper web is a straight plate, and the outer side of the upper web is connected to the flange by a triangular rib plate; the lower web is a downwardly bent plate, and the groove formed between the outer side of the lower web and the flange is connected by a square rib plate.

[0010] The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam is connected by a π-shaped connecting piece. The prestressed steel concrete beam is a composite structure formed by pouring concrete around the steel section, the steel bars in the beam and the prestressed tendons, and the first prestressed tendons and / or the second prestressed tendons are arranged in the prestressed steel concrete beam; the first prestressed tendons of the curved structure are arranged in the curved prestressed tendon channel reserved in the prestressed steel concrete beam, and are connected to the prestressed steel concrete beam by an anchoring method; the second prestressed tendons of the straight structure are buried in the prestressed steel concrete beam by the pre-tensioning method, or are arranged in the horizontal straight prestressed tendon channel reserved on the prestressed steel concrete beam by the post-tensioning method. During assembly, the second prestressed tendons are anchored in the downward bending part of the lower web of the π-shaped connecting piece.

[0011] When the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam adopts an extended short beam-flange sleeve connection node, the prestressed steel concrete beam is a composite structure formed by fixing the steel section, the steel bars in the beam and the prestressed bars around by pouring concrete, and the extended short beam has the same structure as the prestressed steel concrete beam.

[0012] When the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam adopts the extended short beam-flange clamp connection node, a flange clamp is vertically provided at the end of the extended short beam steel bar and the extended short beam steel of the extended short beam, and bolt holes and prestressed tendon holes are reserved on the flange clamp; a flange plate is vertically provided at the end of the steel and the steel bar in the prestressed steel concrete beam, and bolt holes and prestressed tendon holes are reserved on the flange plate; a third prestressed tendon is provided in the prestressed steel concrete beam and the extended short beam, and the third prestressed tendon of the curved structure is passed through the reserved bolt holes and prestressed tendon holes on the flange plate and the flange clamp, and the third prestressed tendon is anchored on the upper side of the extended short beam during assembly.

[0013] The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam adopts an extended short beam-flange clamp connection node, and an anchor bar is provided on one side of the flange clamp, and one end of the extended short beam steel bar and the extended short beam steel section is connected to one side of the flange clamp with the anchor bar, and the anchor bar is located in the extended short beam.

[0014] The construction process of the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam, when the node is connected by a π-shaped connector, comprises the following steps:

[0015] (1) Component production

[0016] 1) Fabrication of prefabricated reinforced concrete columns with π-shaped connectors

[0017] According to the design requirements, the steel bars in the column are tied, and the first high-strength bolt is embedded at the connection position between the concrete column and the π-shaped connector; the π-shaped connector is made, bolt holes are reserved at the upper and lower positions of the flange of the π-shaped connector and the corresponding positions of the concrete column, and anchor bars are welded in the middle of the flange of the π-shaped connector and the corresponding positions of the concrete column; the reserved bolt holes on the π-shaped connector are aligned with the first high-strength bolt embedded on the concrete column, and the anchor bars are extended into the concrete column at the same time, concrete is poured, and the first high-strength bolt connecting the flange of the π-shaped connector and the concrete column is tightened with nuts to form a prefabricated reinforced concrete column with a π-shaped connector;

[0018] 2) Make prefabricated prestressed steel concrete beams

[0019] According to the design requirements, the steel is manufactured, the steel bars in the beam are tied, and bolt holes are reserved at the beam ends; the prestressed tendons are constructed by the pre-tensioning method or the post-tensioning method: in the pre-tensioning method, the second prestressed tendons are a straight structure, and after pouring concrete, a prestressed steel-concrete beam is formed; in the post-tensioning method, a curved prestressed tendon hole is reserved in the prefabricated prestressed steel-concrete beam, or a horizontal straight prestressed tendon hole is reserved in the prefabricated prestressed steel-concrete beam; after pouring concrete, when assembling the first and second prestressed tendons, the first prestressed tendons of the curved structure are anchored on the beam, and the second prestressed tendons of the straight structure are anchored at the downward bending part of the lower web of the π-shaped connector;

[0020] (2) Component Installation

[0021] Hoist the precast reinforced concrete column with π-shaped connector and the precast prestressed steel concrete beam to the designated position, place one end of the precast prestressed steel concrete beam between the upper web and the lower web of the π-shaped connector, align the bolt channel reserved at one end of the precast prestressed steel concrete beam with the reserved holes on the upper web and the lower web, and fix it with a second high-strength bolt.

[0022] The construction process of the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam, if the post-tensioning method is used to apply prestress, it is also necessary to tension the first prestressed tendons and / or the second prestressed tendons, and anchor the first prestressed tendons at a position on the beam or anchor the second prestressed tendons at a lower web position of the π-shaped connector.

[0023] The construction process of the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam, when using the extended short beam-flange sleeve connection node, includes the following steps:

[0024] (1) Component production

[0025] 1) Make prefabricated reinforced concrete columns with extended short beams and flange sleeves

[0026] According to the design requirements, a flange clamp is made, bolt holes and prestressed tendon holes are reserved on the flange clamp, and anchor bars are welded on one side of the flange clamp; the steel bars in the column are tied, and a section of an extended short beam with the same structure as the prefabricated prestressed steel concrete beam is made, and one end of the extended short beam steel bar and the extended short beam steel are welded to one side of the flange clamp with anchor bars, and after pouring concrete, a prefabricated reinforced concrete column with an extended short beam-flange clamp is formed;

[0027] 2) Make prefabricated prestressed steel concrete beams

[0028] Make a flange plate that matches the flange sleeve, reserve bolt holes and prestressed tendon holes on the flange plate; tie the steel bars in the beam, weld one end of the steel bars and the steel section in the beam to the flange plate, and after pouring concrete, form a prefabricated prestressed steel concrete beam with a flange plate at the end;

[0029] (2) Component Installation

[0030] Lift the precast reinforced concrete column with an overhanging short beam-flange sleeve and the precast prestressed steel concrete beam with a flange plate to the designated position, insert the flange plate at the end of the precast prestressed steel concrete beam into the flange sleeve at the end of the overhanging short beam, align the bolt holes, fix with the third high-strength bolt, and then insert the third prestressed tendon of the curved structure, tension the third prestressed tendon, and form a connection node between the precast reinforced concrete column and the precast prestressed steel concrete beam.

[0031] The advantages and beneficial effects of the present invention are:

[0032] 1. Taking into account the characteristics of precast concrete structures and prestressed steel concrete beams, the present invention proposes a structural form that uses precast reinforced concrete columns as pressure-bearing columns and prestressed steel concrete beams as beam components. This structural system has advantages in bearing capacity, stiffness, durability, crack resistance, spanning capacity, etc.

[0033] 2. Since the prefabricated structure is weaker in integrity and rigidity than the cast-in-place concrete structure, the connection reliability between the prefabricated components determines whether the structure can be used normally. Therefore, the node is the key part of the prefabricated structure, which directly affects the overall performance and safety of the structure, and is particularly critical for areas with high seismic intensity. This requires that the connection node should have good bearing capacity and deformation capacity, and should be easy to construct and install at the same time. To this end, the present invention designs two reliable connection methods (π-shaped connector connection, overhanging short beam-flange sleeve connection) that are easy to construct and install, and provides its corresponding construction process. The beam-column structure connected by the above two methods has large rigidity, strong integrity, and the beam and column are tightly connected, which can well transmit internal force and will not produce excessive displacement under the action of seismic load. The structural system of this prefabricated reinforced concrete column and prestressed steel concrete beam has excellent performance in terms of social and economic benefits, and has broad application prospects in large-span building structures, bridges, and heavy-load structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1-Figure 6 This is a schematic diagram of the structure of the π-shaped connector connecting the nodes of the present invention. Figure 1 is the mid-beam-column node, Figure 2 is the beam-column edge node, Figure 3 for Figure 1 AA section view in the figure, Figure 4 for Figure 1 BB section view in Figure 5 for Figure 1 In the CC section view, Figure 6 Assemble the graph for the nodes.

[0035] Figure 7-Figure 11 This is a schematic diagram of the structure of the extended short beam-flange sleeve connection node of the present invention. Figure 7 This is the main view of the beam-column midpoint. Figure 8 This is the main view of the beam-column edge node. Fig. 9 for Figure 7 AA section view in the figure, Fig.10 is the top view of the beam-column edge node. Fig.11 This is a top view of the midpoint of the beam and column.

[0036] Explanation of the figure numbers: 1 Precast reinforced concrete column; 2 Precast prestressed steel-concrete beam; 3 The first prestressed tendon; 4 The first high-strength bolt; 5-π-shaped connector (51 flange, 52 upper web, 53 lower web, 54 triangular rib plate, 55 square rib plate); 6 Anchor bar; 7 Flange plate; 8 Flange sleeve; 9 The second high-strength bolt; 10 Steel bars in column; 11 Steel; 12 Steel bars in beam; 13 Bolt channel; 14 The second prestressed tendon; 15 The third high-strength bolt; 16 Extended short beam; 17 Extended short beam steel bars; 18 Extended short beam steel; 19 The third prestressed tendon. DETAILED DESCRIPTION

[0037] In the specific implementation process, the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam of the present invention mainly includes one or a combination of a π-shaped connector connection node and an extended short beam-flange sleeve connection node.

[0038] like Figure 1-Figure 6 As shown, the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam of the present invention adopts a π-shaped connecting piece to connect the nodes, and the specific structure is as follows:

[0039] One end of the prestressed steel concrete beam 2 is connected to the π-shaped connector 5 of the precast reinforced concrete column 1. The top of the steel 11 at this end is provided with a concrete layer, the bottom of the steel 11 is exposed (no concrete layer is provided), and a bolt channel 13 is provided vertically through the upper and lower webs 52 and 53. One end of the precast prestressed steel concrete beam 2 extends between the upper web 52 and the lower web 53 of the π-shaped connector 5, and is in close contact with the upper web 52 and the lower web 53. The bolt channel 13 of the precast prestressed steel concrete beam 2 is aligned with the reserved holes on the upper web 52 and the lower web 53, and is connected and fixed by the second high-strength bolt 9.

[0040] A first high-strength bolt 4 is provided above and below the connection position between the concrete column and the π-shaped connector 5, and bolt holes are reserved above and below the flange 51 of the π-shaped connector 5 and at the corresponding positions of the concrete column. The first high-strength bolt 4 on the concrete column is passed through the reserved bolt holes on the π-shaped connector 5 and is fixed by nuts; an anchor bar 6 is provided in the middle of the corresponding position between the flange 51 of the π-shaped connector 5 and the concrete column, and one end of the anchor bar 6 extends into the concrete column. The first high-strength bolt 4 and the anchor bar 6 are fixed to the concrete column made by pouring concrete, so as to form a prefabricated reinforced concrete column 1 with a π-shaped connector 5.

[0041] The π-shaped connector 5 is an integrated structure of a vertical flange 51 and horizontal upper and lower webs 52 and 53, wherein: the upper web 52 is a straight plate, and the outer side of the upper web 52 is connected to the flange 51 via a triangular rib 54; the lower web 53 is a downwardly bent plate, and the groove formed between the outer side of the lower web 53 and the flange 51 is connected via a square rib 55.

[0042] The prestressed steel concrete beam 2 is a composite structure formed by pouring concrete around the steel 11, the steel bars 12 in the beam and the prestressed tendons. A first prestressed tendon 3 and / or a second prestressed tendon 14 are provided in the prestressed steel concrete beam 2; the first prestressed tendon 3 of the curved structure is arranged in the curved prestressed tendon channel reserved in the prestressed steel concrete beam 2, and is connected to the prestressed steel concrete beam 2 by an anchoring method; the second prestressed tendon 14 of the straight structure is buried in the prestressed steel concrete beam 2 by the pre-tensioning method, or is arranged in the horizontal straight prestressed tendon channel reserved on the prestressed steel concrete beam 2 by the post-tensioning method. During assembly, the second prestressed tendon 14 is anchored in the downward bending part of the lower web 53 of the π-shaped connector 5.

[0043] like Figure 7-Figure 11 As shown, the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam of the present invention adopts an extended short beam-flange sleeve connection node, and the specific structure is as follows:

[0044] An overhanging short beam 16 is provided at the connection between the precast reinforced concrete column 1 and the prestressed steel concrete beam 2. The precast reinforced concrete column 1 is connected to the prestressed steel concrete beam 2 via the overhanging short beam 16 thereon. The prestressed steel concrete beam 2 is clamped in the flange sleeve 8 at the end of the overhanging short beam 16 via the flange plate 7 at the end. At the same time, the flange plate 7 and the flange sleeve 8 are connected and fixed via a third high-strength bolt 15.

[0045] The prestressed steel concrete beam 2 is a composite structure formed by pouring concrete around the steel bars 11 , the steel bars 12 in the beam and the prestressed bars. The extended short beam 16 has the same structure as the prestressed steel concrete beam 2 .

[0046] A flange sleeve 8 is vertically provided at the end of the extended short beam reinforcement 17 and the extended short beam section steel 18 of the extended short beam 16, and bolt holes and prestressed tendon holes are reserved on the flange sleeve 8; a flange plate 7 is vertically provided at the end of the section steel 11 and the inner reinforcement 12 of the prestressed steel concrete beam 2, and bolt holes and prestressed tendon holes are reserved on the flange plate 7; a third prestressed tendon 19 is provided in the prestressed steel concrete beam 2 and the extended short beam 16, and the third prestressed tendon 19 of the curved structure is penetrated through the reserved bolt holes and prestressed tendon holes on the flange plate 7 and the flange sleeve 8, and the third prestressed tendon 19 is anchored on the upper side of the extended short beam 16 during assembly.

[0047] An anchor bar 6 is provided on one side of the flange sleeve 8 , and one end of the extended short beam steel bar 17 and the extended short beam section steel 18 are connected to one side of the flange sleeve 8 with the anchor bar 6 , and the anchor bar 6 is located in the extended short beam 16 .

[0048] like Figure 1-Figure 11 As shown, the construction process of the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam of the present invention is as follows:

[0049] 1. π-shaped connector connection node ( Figure 1-Figure 6 )

[0050] Component production:

[0051] (1) Producing a prefabricated reinforced concrete column 1 with a π-shaped connector 5. Tie the steel bars 10 in the column according to the design requirements, and embed the first high-strength bolt 4 at the connection position between the concrete column and the π-shaped connector 5; Produce the π-shaped connector 5, reserve bolt holes at the upper and lower positions of the flange 51 of the π-shaped connector 5 corresponding to the concrete column, and weld anchor bars 6 at the middle of the flange 51 of the π-shaped connector 5 corresponding to the concrete column; Align the reserved bolt holes on the π-shaped connector 5 with the first high-strength bolts 4 embedded in the concrete column, and at the same time extend the anchor bars 6 into the concrete column, pour concrete, and then tighten the first high-strength bolts 4 connecting the flange 51 of the π-shaped connector 5 to the concrete column with nuts, thereby forming a prefabricated reinforced concrete column 1 with a π-shaped connector 5.

[0052] (2) Prefabricated prestressed steel concrete beam 2 is manufactured. Steel 11 is manufactured according to the design requirements, steel bars 12 are tied inside the beam, and bolt holes 13 are reserved at the beam ends. The prestressed tendons can be constructed by pre-tensioning or post-tensioning. In the pre-tensioning method, the second prestressed tendons 14 are straight structures, and after pouring concrete, the prestressed steel concrete beam 2 is formed. In the post-tensioning method, curved prestressed tendon holes can be reserved in the prefabricated prestressed steel concrete beam 2, or horizontal straight prestressed tendon holes can be reserved in the prefabricated prestressed steel concrete beam 2. After pouring concrete, when assembling the first prestressed tendons 3 and the second prestressed tendons 14, the curved structure of the first prestressed tendons 3 is anchored on the beam, and the straight structure of the second prestressed tendons 14 is anchored at the downward bending part of the lower web 53 of the π-shaped connector 5.

[0053] Component Installation:

[0054] The prefabricated reinforced concrete column 1 with the π-shaped connector 5 and the prefabricated prestressed steel concrete beam 2 are hoisted to the designated position, one end of the prefabricated prestressed steel concrete beam 2 is placed between the upper web 52 and the lower web 53 of the π-shaped connector 5, the bolt channel 13 reserved at one end of the prefabricated prestressed steel concrete beam 2 is aligned with the reserved holes on the upper web 52 and the lower web 53, and fixed by the second high-strength bolt 9. If the post-tensioning method is used to apply prestress, the first prestressed tendon 3 and / or the second prestressed tendon 14 need to be tensioned, and the first prestressed tendon 3 is anchored at the position on the beam or the second prestressed tendon 14 is anchored at the position of the lower web 53 of the π-shaped connector 5.

[0055] 2. Extended short beam-flange sleeve connection node ( Figure 7-Figure 11 )

[0056] Component production:

[0057] (1) Produce a prefabricated reinforced concrete column 1 with an extended short beam-flange sleeve. Produce a flange sleeve 8 according to the design requirements, reserve bolt holes and prestressed tendon holes on the flange sleeve 8, and weld anchor bars 6 on one side of the flange sleeve 8; tie the steel bars 10 in the column, produce an extended short beam 16 with the same structure as the prefabricated prestressed steel concrete beam 2, weld one end of the extended short beam steel bar 17 and the extended short beam steel 18 to the side of the flange sleeve 8 with the anchor bar 6, and after pouring concrete, form a prefabricated reinforced concrete column 1 with an extended short beam-flange sleeve.

[0058] (2) Prefabricated prestressed steel concrete beam 2. A flange plate 7 is prepared to match the flange sleeve 8, and bolt holes and prestressed tendon holes are reserved on the flange plate 7; the steel bars 12 in the beam are tied, and one end of the steel bars 12 in the beam and the steel 11 are welded to the flange plate 7. After pouring concrete, a prefabricated prestressed steel concrete beam 2 with a flange plate at the end is formed.

[0059] Component Installation:

[0060] The prefabricated reinforced concrete column 1 with an overhanging short beam-flange sleeve and the prefabricated prestressed steel concrete beam 2 with a flange plate 7 are hoisted to the designated position, the flange plate 7 at the end of the prefabricated prestressed steel concrete beam 2 is inserted into the flange sleeve 8 at the end of the overhanging short beam, the bolt holes are aligned, fixed with the third high-strength bolt 15, and then the third prestressed tendon 19 of the curved structure is inserted, and the third prestressed tendon 19 is tensioned to form a connection node between the prefabricated reinforced concrete column 1 and the prefabricated prestressed steel concrete beam 2.

[0061] In the present invention, the performance grade of the high-strength bolt is above grade 8.8.

[0062] The implementation results show that in order to better control the deflection and cracks of the steel-concrete structure, the present invention adopts the method of applying prestress, arranging prestressed steel cables near the lower flange of the tension steel beam to form a prestressed steel-concrete beam. In addition to the characteristics of ordinary steel-concrete beams, this structure also has excellent crack resistance, can significantly improve the stiffness of the beam, reduce deflection, increase the durability of the structure, save materials, reduce dead weight, and improve spanning capacity.

Claims

1. A connection node between a prefabricated reinforced concrete column and a prestressed steel concrete beam, characterized in that: It includes one or a combination of a π-shaped connector connection node and an extended short beam-flange sleeve connection node; The structure of the node connection using the π-shaped connector is as follows: one end of the prestressed steel concrete beam is connected to the π-shaped connector of the precast reinforced concrete column, the top of the steel at this end is provided with a concrete layer, the bottom of the steel is exposed, and a bolt channel is provided vertically through the upper and lower webs; one end of the precast prestressed steel concrete beam extends between the upper web and the lower web of the π-shaped connector, and is in close contact with the upper web and the lower web, the bolt channel of the precast prestressed steel concrete beam is aligned with the reserved holes on the upper web and the lower web, and is fixed by a second high-strength bolt connection; The structure of the node using an extended short beam-flange clamp connection is as follows: an extended short beam is provided at the connection between the precast reinforced concrete column and the prestressed steel concrete beam, the precast reinforced concrete column is connected to the prestressed steel concrete beam through the extended short beam thereon, the prestressed steel concrete beam is clamped in the flange clamp at the end of the extended short beam through the flange plate at the end, and the flange plate and the flange clamp are fixed by a third high-strength bolt.

2. The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 1, characterized in that: When a π-shaped connector is used to connect the node, the π-shaped connector is an integrated structure of a vertical flange and horizontal upper and lower webs, wherein: the upper web is a straight plate, and the outer side of the upper web is connected to the flange by a triangular rib plate; the lower web is a downwardly bent plate, and the groove formed between the outer side of the lower web and the flange is connected by a square rib plate.

3. The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 1, characterized in that: When π-shaped connectors are used to connect nodes, the prestressed steel-concrete beam is a composite structure formed by pouring concrete around the steel, steel bars in the beam and prestressed tendons, and the first prestressed tendons and / or second prestressed tendons are arranged in the prestressed steel-concrete beam; the first prestressed tendons of the curved structure are arranged in the curved prestressed tendon channels reserved in the prestressed steel-concrete beam, and are connected to the prestressed steel-concrete beam by an anchoring method; the second prestressed tendons of the straight structure are buried in the prestressed steel-concrete beam by the pre-tensioning method, or are arranged in the horizontal straight prestressed tendon channels reserved on the prestressed steel-concrete beam by the post-tensioning method. During assembly, the second prestressed tendons are anchored in the downward bending part of the lower web of the π-shaped connector.

4. The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 1, characterized in that: When the extended short beam-flange clamp connection node is adopted, the prestressed steel concrete beam is a composite structure formed by fixing the steel section, the steel bars in the beam and the prestressed bars by pouring concrete. The above-mentioned structure of the extended short beam is the same as that of the prestressed steel concrete beam.

5. The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 1, characterized in that: When the extended short beam-flange clamp connection node is adopted, flange clamps are vertically provided at the ends of the extended short beam reinforcement and the extended short beam steel of the extended short beam, and bolt holes and prestressed tendon holes are reserved on the flange clamps; flange plates are vertically provided at the ends of the steel sections and the reinforcements in the beam of the prestressed steel concrete beam, and bolt holes and prestressed tendon holes are reserved on the flange plates; third prestressed tendons are provided in the prestressed steel concrete beam and the extended short beam, and the third prestressed tendons of the curved structure are passed through the reserved bolt holes and prestressed tendon holes on the flange plates and the flange clamps, and the third prestressed tendons are anchored on the upper side of the extended short beam during assembly.

6. The connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 1, characterized in that: When the extended short beam-flange clamp connection node is adopted, anchor bars are provided on one side of the flange clamp, and one end of the extended short beam reinforcement and the extended short beam section steel is connected to one side of the flange clamp with the anchor bars, and the anchor bars are located inside the extended short beam.

7. A construction process for the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to any one of claims 1 to 3, characterized in that: When the nodes are connected using a π-shaped connector, the following steps are included: (1) Component production 1) Fabrication of prefabricated reinforced concrete columns with π-shaped connectors According to the design requirements, the steel bars in the column are tied, and the first high-strength bolt is embedded at the connection position between the concrete column and the π-shaped connector; the π-shaped connector is made, bolt holes are reserved at the upper and lower positions of the flange of the π-shaped connector and the corresponding positions of the concrete column, and anchor bars are welded in the middle of the flange of the π-shaped connector and the corresponding positions of the concrete column; the reserved bolt holes on the π-shaped connector are aligned with the first high-strength bolt embedded on the concrete column, and the anchor bars are extended into the concrete column at the same time, concrete is poured, and the first high-strength bolt connecting the flange of the π-shaped connector and the concrete column is tightened with nuts to form a prefabricated reinforced concrete column with a π-shaped connector; 2) Make prefabricated prestressed steel concrete beams According to the design requirements, the steel is manufactured, the steel bars in the beam are tied, and bolt holes are reserved at the beam ends; the prestressed tendons are constructed by the pre-tensioning method or the post-tensioning method: in the pre-tensioning method, the second prestressed tendons are a straight structure, and after pouring concrete, a prestressed steel-concrete beam is formed; in the post-tensioning method, a curved prestressed tendon hole is reserved in the prefabricated prestressed steel-concrete beam, or a horizontal straight prestressed tendon hole is reserved in the prefabricated prestressed steel-concrete beam; after pouring concrete, when assembling the first and second prestressed tendons, the first prestressed tendons of the curved structure are anchored on the beam, and the second prestressed tendons of the straight structure are anchored at the downward bending part of the lower web of the π-shaped connector; (2) Component Installation Hoist the precast reinforced concrete column with π-shaped connector and the precast prestressed steel concrete beam to the designated position, place one end of the precast prestressed steel concrete beam between the upper web and the lower web of the π-shaped connector, align the bolt channel reserved at one end of the precast prestressed steel concrete beam with the reserved holes on the upper web and the lower web, and fix it with a second high-strength bolt.

8. The construction process of the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to claim 7, characterized in that: If the post-tensioning method is used to apply prestress, the first prestressed tendons and / or the second prestressed tendons need to be tensioned, and the first prestressed tendons are anchored at a position on the beam or the second prestressed tendons are anchored at a lower web position of the π-shaped connector.

9. A construction process for the connection node between the prefabricated reinforced concrete column and the prestressed steel concrete beam according to any one of claims 1, 4 to 6, characterized in that: When the node is connected by an extended short beam-flange sleeve, the following steps are included: (1) Component production 1) Make prefabricated reinforced concrete columns with extended short beams and flange sleeves According to the design requirements, a flange clamp is made, bolt holes and prestressed tendon holes are reserved on the flange clamp, and anchor bars are welded on one side of the flange clamp; the steel bars in the column are tied, and a section of an extended short beam with the same structure as the prefabricated prestressed steel concrete beam is made, and one end of the extended short beam steel bar and the extended short beam steel are welded to one side of the flange clamp with anchor bars, and after pouring concrete, a prefabricated reinforced concrete column with an extended short beam-flange clamp is formed; 2) Make prefabricated prestressed steel concrete beams Make a flange plate that matches the flange sleeve, reserve bolt holes and prestressed tendon holes on the flange plate; tie the steel bars in the beam, weld one end of the steel bars and the steel section in the beam to the flange plate, and after pouring concrete, form a prefabricated prestressed steel concrete beam with a flange plate at the end; (2) Component Installation Lift the precast reinforced concrete column with an overhanging short beam-flange sleeve and the precast prestressed steel concrete beam with a flange plate to the designated position, insert the flange plate at the end of the precast prestressed steel concrete beam into the flange sleeve at the end of the overhanging short beam, align the bolt holes, fix with the third high-strength bolt, and then insert the third prestressed tendon of the curved structure, tension the third prestressed tendon, and form a connection node between the precast reinforced concrete column and the precast prestressed steel concrete beam.

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