Prefabricated-pouring uHPC mixed frame structure beam-column connection joint and construction method

Abstract

The application discloses a prefabricated-post-cast UHPC mixed type frame structure beam-column connecting joint and a construction method, belongs to the technical field of fabricated buildings, and comprises a fully prefabricated lower column, a node prefabricated UHPC part, a fully prefabricated beam, a node post-cast UHPC part and a fully prefabricated upper column, and the fully prefabricated lower column and the fully prefabricated upper column are respectively fixed at the bottom and the top of the node prefabricated UHPC part; the node prefabricated UHPC part comprises a bottom plate, a stand column, a core pipe and a reserved hole. The beam-column connecting joint designed by the application is built by using the mixed type of UHPC prefabrication for part structures and UHPC post-casting for part structures, so that the construction difficulties such as node steel congestion and collision and formwork supporting difficulty are solved, the high performance of UHPC is utilized, the longitudinal steel of the core pipe and the fully prefabricated beam is welded, the overall performance of the node is ensured, the UHPC consumption is reduced by using the core pipe, and the cost is saved.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, specifically to the beam-column connection nodes and construction methods of precast-post-cast UHPC hybrid frame structures. Background Technology

[0002] Prefabricated buildings, as an important vehicle for promoting the transformation, upgrading and high-quality development of my country's construction industry, are widely used in frame structures such as public buildings and industrial plants, and have broad market prospects.

[0003] Beam-column joints are critical force-transfer components in prefabricated frame structures, and their performance directly determines the overall structural stability and seismic safety. Currently, guided by the design principle of "equivalent to cast-in-place," a common approach is to cast concrete in the joint area and anchor the longitudinal reinforcement of the beam into it to simulate the integrity of a cast-in-place joint. However, this technique still faces significant challenges in practical applications. For example, dense reinforcement in the joint area can easily lead to congestion and collisions, and the formwork erection in the post-cast area is difficult, which not only increases the construction difficulty but also easily causes quality problems such as inaccurate reinforcement positioning and insufficient concrete compaction, thus affecting the final performance of the joint. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a beam-column connection node and construction method for a precast-post-cast UHPC hybrid frame structure. By combining the use of the precast UHPC part and the post-cast UHPC part of the node, not only can the connection strength of the node be improved, but construction can also be facilitated.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a beam-column connection node for a precast-post-cast UHPC hybrid frame structure, including a fully precast lower column, a node precast UHPC part, a fully precast beam, a node post-cast UHPC part, and a fully precast upper column. The fully precast lower column and the fully precast upper column are respectively fixed to the bottom and top of the node precast UHPC part. The precast UHPC section of the node includes a base plate, columns, and core tubes. The core tubes are fixed at the top center of the base plate, and the columns are fixed at the top of the base plate and surround the core tubes. A gap is left between the columns and the core tubes. The columns are provided with notches for inserting longitudinal steel bars at the ends of the fully precast beams. The post-cast UHPC section of the node is cast in the gap between the columns, the end faces of the fully precast beams, and the outer periphery of the core tubes, and wraps the longitudinal steel bars.

[0006] Preferably, each of the four corners of the prefabricated UHPC section of the node is provided with multiple through reserved holes, and the multiple vertical steel bars extending from the top of the fully prefabricated lower column pass through the multiple reserved holes one by one.

[0007] Preferably, the lower end of the fully prefabricated upper column is pre-embedded with multiple sleeves, and the multiple sleeves correspond one-to-one with multiple vertical reinforcing bars. The vertical reinforcing bars are inserted into the corresponding sleeves after passing through the prefabricated UHPC part of the node.

[0008] Preferably, both the reserved hole and the sleeve are filled with high-strength grout.

[0009] Preferably, a grouting layer is provided between the top of the fully prefabricated lower column and the bottom of the node prefabricated UHPC part, and between the bottom of the fully prefabricated upper column and the top of the node prefabricated UHPC part.

[0010] Preferably, the bottom surface shape and dimensions of the base plate are the same as the cross-sectional shape and dimensions of the fully prefabricated lower column, the height of the column is the same as the height of the fully prefabricated beam, and the width of the notch is the same as the width of the fully prefabricated beam.

[0011] Preferably, the outer wall dimension of the core tube on the side closest to the precast beam is adapted to the required dimension for the lap splicing of the longitudinal reinforcement of the precast beam.

[0012] Preferably, the number of notches is the same as the number of fully precast beams, and the positions of the notches are set on the side walls of the columns according to the positions where the fully precast beams are to be placed.

[0013] Preferably, the longitudinal reinforcing bars of the precast beam pass through the notch and are welded to the core tube.

[0014] The construction method for the beam-column connection nodes of the above-mentioned precast-post-cast UHPC hybrid frame structure includes the following steps: Step 1: Construct fully precast lower-level columns, precast UHPC joints, fully precast beams, and fully precast upper-level columns; Step 2: Lay the first grout layer on the top surface of the already constructed fully prefabricated lower column, insert the reserved holes of the prefabricated UHPC part of the node into the vertical steel bars of the fully prefabricated lower column, and install the prefabricated UHPC part of the node on the top surface of the first grout layer. Step 3: Inject the first high-strength grout into the reserved holes of the precast UHPC section of the node and cure it properly; Step 4: Install the fully precast beam into the notch of the column of the precast UHPC section at the node and on the bottom plate, and weld the longitudinal steel bars to the core tube. Step 5: Pour the UHPC portion into the gap between the end face of the column, the fully precast beam and the outer periphery of the core tube, wrap the longitudinal steel bars, and cure in place; Step 6: Lay a second grout layer on the top surface of the precast UHPC section of the node, install the fully precast upper column, insert the sleeve pre-embedded in the lower part of the fully precast upper column into the vertical steel bars of the fully precast lower column, inject the second high-strength grout into the sleeve, and cure it in place to complete the node construction.

[0015] The beneficial effects of this invention are as follows: (1) The precast UHPC part of the node designed in this invention can be prefabricated in the factory using templates. Since there is no obstruction from the fully precast beam, the precast UHPC part of the node is easy to cast. During on-site assembly, the precast UHPC part of the node can serve as a permanent template for the post-cast UHPC part of the node, eliminating the need to erect the post-cast concrete template during the assembly process. The hybrid connection of precast UHPC and post-cast UHPC fully utilizes the high performance of UHPC material, effectively ensuring the overall performance and seismic performance of the node while simplifying the on-site construction process, improving construction efficiency, reducing construction difficulty, and realizing green design and construction.

[0016] (2) The post-cast UHPC part of the node set in this invention uses UHPC, a high-performance material. With its high performance, the anchorage length requirement of the longitudinal reinforcement of the fully precast beam can be reduced. This means that the longitudinal reinforcement of the multi-directional fully precast beam does not need to extend too far into the node, thereby avoiding mutual interference and completely solving the problem of node reinforcement crowding and collision.

[0017] (3) In this invention, the welding of the longitudinal steel bars of the fully precast beam to the core tube can further ensure the anchorage performance of the longitudinal steel bars of the fully precast beam inside the beam-column connection node, thereby ensuring the reliability of the beam-column connection.

[0018] (4) The present invention takes into account that the core tube is located in the middle of the node. From the perspective of stress state, there is no need to fill the core tube with UHPC, thereby reducing the amount of UHPC used and achieving the purpose of saving costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of the precast UHPC portion of a beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where beams are present on all four sides.

[0021] Figure 2 This is a perspective view of the precast UHPC portion of a beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where beams are present on three sides.

[0022] Figure 3This is a perspective view of the precast UHPC portion of a beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where beams are present on two sides.

[0023] Figure 4 This is a perspective view of the precast UHPC portion of a beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where there are beams on two sides at the corner.

[0024] Figure 5 This is a perspective view of the precast UHPC portion of a beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, when one side of the node has a beam.

[0025] Figure 6 This is a perspective view of the beam-column joint when there are beams on all four sides in the beam-column connection node of the precast-post-cast UHPC hybrid frame structure provided in the embodiment of the present invention.

[0026] Figure 7 This is a top view of the beam-column joint when there are beams on all four sides in the beam-column connection node of the precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention.

[0027] Figure 8 This is a structural disassembly diagram of the beam-column connection node in a precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where there are beams on all four sides.

[0028] Figure 9 This is a three-dimensional view of the overall structure of the beam-column connection node in the precast-post-cast UHPC hybrid frame structure provided in an embodiment of the present invention, where there are beams on all four sides.

[0029] Explanation of reference numerals in the attached figures: 10. Fully precast lower column; 11. Vertical reinforcement; 20. Precast UHPC part at the node; 21. Base plate; 22. Column; 23. Core tube; 24. Reserved hole; 30. Fully precast beam; 31. Longitudinal reinforcement; 40. Post-cast UHPC part at the node; 50. Fully precast upper column; 51. Sleeve; 60. First grout layer; 70. First high-strength grout; 80. Second grout layer; 90. Second high-strength grout. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: like Figures 1 to 9 As shown, Embodiment 1 of the present invention provides a precast-post-cast UHPC hybrid frame structure beam-column connection node. Its main structure includes a fully precast lower-level column 10, a precast UHPC node portion 20, a fully precast beam 30, a post-cast UHPC node portion 40, and a fully precast upper-level column 50. The fully precast beam 30, the fully precast lower-level column 10, the fully precast upper-level column 50, and the precast UHPC node portion 20 are all precast before building assembly, while the post-cast UHPC node portion 40 is cast during the building assembly process.

[0032] In the beam-column frame connection structure, the fully prefabricated lower column 10 and fully prefabricated upper column 50 are fixedly connected to the bottom and top of the prefabricated UHPC section 20 at the node, respectively, while the fully prefabricated beam 30 is connected to the side of the prefabricated UHPC section 20 at the node. As the core hub of the beam-column connection node, the prefabricated UHPC section 20 at the node mainly consists of three parts: a base plate 21, columns 22, and core tubes 23. The base plate 21 and columns 22 are cast using UHPC casting with formwork, and the bottom of the core tubes 23 is inserted into the base plate 21. The thickness of the base plate 21 is prefabricated according to the stress requirements of the building; when the required stress is large, the thickness of the base plate 21 is appropriately increased.

[0033] The core tube 23 is a steel pipe with a circular or rectangular cross-section. During the manufacturing of the prefabricated UHPC portion 20 of the node, the core tube 23 is firmly fixed to the top center of the base plate 21, with the top of the core tube 23 flush with the top of the column 22. The column 22 is also fixed to the top of the base plate 21 and surrounds the core tube 23 in a ring shape. A certain gap is intentionally left between the inner wall of the column 22 and the outer wall of the core tube 23. This gap serves two purposes: firstly, to separate the column 22 from the core tube 23 to facilitate the casting of the column 22; and secondly, to serve as a casting cavity for the subsequent post-cast UHPC portion 40 of the node. Figures 1 to 5 As shown, the prefabricated UHPC section 20 in this invention is generally rectangular in shape. The columns 22 extend upwards from the upper surface of the base plate 21 around the core tube 23. The four sides of the columns 22 are pre-stressed with matching gaps based on the number of fully prefabricated beams 30 to be assembled. For example... Figure 1 As shown, when the precast UHPC section 20 of the node needs to be assembled with four fully precast beams 30, notches are made on all four sides of the column 22, and the longitudinal steel bars 31 at the ends of the four fully precast beams 30 can pass through the four notches and contact the core tube 23 respectively. Figures 1 to 5 As shown, the node prefabricated UHPC part 20 of the present invention can be configured with the number of notches according to actual needs to meet the assembly requirements of various complex frame node connections such as single-sided, double-sided, corner and four-sided.

[0034] The post-cast UHPC section 40 is poured on-site within the gap formed by the inner wall of the column 22, the top of the base slab 21, the end face of the fully precast beam 30, and the outer perimeter of the core tube 23. During pouring, the UHPC material completely and densely encloses the inserted longitudinal reinforcing bars 31, forming a structure that fits onto the core tube 23. The post-cast UHPC section 40 effectively fixes the end of the fully precast beam 30 to the precast UHPC section 20, forming a stable connection node.

[0035] The above scheme has the following advantages: Firstly, since there is no obstruction from the fully precast beam 30 during the production stage of the precast UHPC section 20, the precast UHPC section 20 can be prefabricated in the factory with high precision using templates, making it easy to cast and control the quality. During on-site assembly, the columns 22 and base plate 21 of the precast UHPC section 20, together with the fully precast beam 30, form a permanent, non-removable template for the post-cast UHPC section 40, completely eliminating the complex post-cast concrete template erection process in traditional assembly. This not only simplifies the on-site construction process and reduces construction difficulty but also significantly improves construction efficiency.

[0036] Secondly, UHPC (Ultra-High Performance Concrete), a high-strength material with excellent mechanical properties and interfacial bonding strength, was used in the post-cast area of ​​the joint. Compared with traditional post-cast concrete, it can significantly reduce the anchorage length requirement of the longitudinal reinforcement 31 of the fully precast beam 30. This characteristic allows the longitudinal reinforcement 31 of the fully precast beam 30 from multiple directions to not extend excessively deep into the joint, thus effectively avoiding mutual interference and collision at the center of the joint due to excessively long reinforcement, and completely solving the industry pain point of congested reinforcement at joints in prefabricated buildings. Figure 7 As shown, the longitudinal reinforcing bars 31 of the four precast beams 30 are inserted into the four notches respectively. The longitudinal reinforcing bars 31 only need to extend to contact the core tube 23. There is no interference between the longitudinal reinforcing bars 31 of the precast beams 30.

[0037] Finally, based on reasonable considerations of the structural stress state, the core tube 23 is located in the central region of the node. No additional UHPC material needs to be poured into the core tube 23, and its structural strength is sufficient to meet the requirements. This design effectively reduces the amount of UHPC material used, achieving the goal of saving construction costs.

[0038] Example 2: Based on Embodiment 1, this embodiment further designs the connection between the fully prefabricated lower column 10 and the fully prefabricated upper column 50 and the node prefabricated UHPC part 20.

[0039] like Figures 7 to 9As shown, to ensure a precise and high-strength connection between the fully precast lower column 10 and the fully precast upper column 50 and the precast UHPC section 20 at the nodes, multiple through-holes 24 are provided at each of the four corners of the precast UHPC section 20. These through-holes 24 connect the column 22 and the base plate 21 and are located inside the four corners of the base plate 21. To complement this structure, the vertical reinforcing bars 11 embedded in the fully precast lower column 10 are also distributed inside the four corners, their positions corresponding one-to-one with the through-holes 24.

[0040] During assembly, these vertical reinforcing bars 11 can pass through multiple pre-drilled holes 24 in the precast UHPC section 20 one by one, thereby completing the horizontal positioning of the precast UHPC section 20 and the fully precast lower column 10. At this time, the precast UHPC section 20 can only move up and down. Then, the first high-strength grout 70 is injected into the pre-drilled holes 24 to fix the vertical reinforcing bars 11 in the pre-drilled holes 24, realizing a firm connection between the precast UHPC section 20 and the fully precast lower column 10. At the same time, multiple sleeves 51 are pre-embedded inside the lower end of the fully precast upper column 50, and the positions of these sleeves 51 correspond one-to-one with the positions of the vertical reinforcing bars 11. After the vertical reinforcing bar 11 passes through the precast UHPC part 20 at the node, it is directly inserted into the corresponding sleeve 51. By injecting the second high-strength grout 90 into the sleeve 51, the sleeve 51 and the vertical reinforcing bar 11 can be fixed, thereby achieving a firm connection between the fully precast upper column 50, the precast UHPC part 20 at the node, and the fully precast lower column 10.

[0041] To ensure the quality of subsequent grouting and anchoring, the sleeve 51 can be a corrugated metal pipe with ribs on its surface or a steel reinforcement grouting sleeve. Both the corrugated metal pipe and the steel reinforcement grouting sleeve can have excellent connection strength with the fully precast upper column 50, and can also effectively anchor the vertical steel reinforcement 11 after grouting.

[0042] Example 3: Based on Embodiments 1 and 2, in order to compensate for manufacturing errors of components and ensure uniform stress on the assembly contact surfaces between the fully prefabricated upper column 50, the fully prefabricated lower column 10, and the prefabricated UHPC section 20 at the nodes, a grout layer is laid between the top of the fully prefabricated lower column 10 and the bottom of the prefabricated UHPC section 20 at the nodes, and between the bottom of the fully prefabricated upper column 50 and the top splicing surface of the prefabricated UHPC section 20 at the nodes. The grout layer can compensate for the unevenness of the prefabricated contact surfaces, enabling seamless bonding between the components and providing good buffering force transmission.

[0043] In terms of size and shape matching, combined Figure 1 and Figure 8It can be seen that the bottom shape and outer contour dimensions of the base plate 21 are exactly the same as the cross-sectional shape and dimensions of the fully precast lower column 10, ensuring the smooth and flush appearance of the column. The overall height of the column 22 is the same as the height of the fully precast beam 30, which means that after the end of the fully precast beam 30 is placed in the notch, the top of the fully precast beam 30 is flush with the top of the column 22. The width of the notch on the side wall of the column 22 is also exactly the same as the width of the fully precast beam 30, which allows the end of the fully precast beam 30 to be embedded almost perfectly into the precast UHPC part 20 of the node, so that no grout leakage will occur when the UHPC part 40 is poured after the node is poured, thus avoiding material waste.

[0044] The longitudinal reinforcing bars 31 extending from the end of the fully precast beam 30 not only pass through the notch in the column 22 and enter the cavity of the precast UHPC section 20 at the node, but are also further welded and fixed to the core tube 23. To facilitate welding and ensure joint quality, the outer wall dimensions of the core tube 23 on the side closest to the fully precast beam 30 need to be pre-calculated to meet the dimensional requirements for lapping with the longitudinal reinforcing bars 31 of the fully precast beam 30. Figure 7 As shown, when the core tube 23 is square steel, its width should be greater than or equal to the maximum spacing of the longitudinal reinforcement 31. Rigid welding of the longitudinal reinforcement 31 of the fully precast beam 30 to the core tube 23 can further enhance the pull-out resistance and anchorage performance of the longitudinal reinforcement 31 of the fully precast beam 30 inside the beam-column connection node, ensuring the reliability of the overall beam-column connection.

[0045] Example 4: This embodiment, based on embodiments one through three, provides a construction method for beam-column connection nodes in a precast-post-cast UHPC hybrid frame structure, specifically following standardized steps: Step 1: First, in the prefabrication plant, the prefabrication and curing of the fully prefabricated lower column 10, the prefabricated UHPC part 20, the fully prefabricated beam 30, and the fully prefabricated upper column 50 are completed in accordance with the existing building design specifications. According to the shape and size requirements of the components, molds are set up for component casting. Step 2: On the top surface of the fully prefabricated lower column 10 that has been installed in place at the construction site, the first grout layer 60 is evenly laid; then the prefabricated UHPC part 20 of the node is lifted, and the reserved holes 24 at its four corners are precisely inserted into the vertical steel bars 11 extending upward from the fully prefabricated lower column 10, and the prefabricated UHPC part 20 of the node is stably installed on the top surface of the first grout layer 60 under its own weight. Step 3: Fully inject the first high-strength grout 70 into the reserved holes 24 at the four corners of the precast UHPC part 20 of the node, so as to fill the gaps in the holes to anchor the vertical steel bars 11, and cure until the strength is in place. Step 4: Hoist the fully precast beam 30 and move it horizontally to install it in the pre-set notch of the column 22 of the precast UHPC part 20 at the node, and support it on the base plate 21; then the welding personnel weld and fix the longitudinal steel bars 31 of the fully precast beam 30 that penetrate into the node to the outer wall of the central core tube 23. Step 5: Using the precast columns 22 and base plate 21 as templates, continuously pour well-flowing UHPC material into the gaps formed between the inner wall of the columns 22, the top of the base plate 21, the end face of the fully precast beam 30, and the outer periphery of the core tube 23. After the node is completed, pour the UHPC part 40 to completely and densely wrap the internal longitudinal steel bars 31. After the pouring is completed, perform standard curing until the UHPC material reaches the required strength to form a solid node core. Step six: Evenly lay the second grout layer 80 on the top surface of the precast UHPC section 20 of the node, and then hoist and install the fully precast upper column 50; during the lowering process, accurately fit the sleeve 51 pre-embedded at the lower end of the fully precast upper column 50 into the vertical steel bar 11 extending from the fully precast lower column 10; finally, fully inject the second high-strength grout 90 into the sleeve 51 through the special grouting hole, and cure it to the specified strength. Thus, the assembly construction of the entire precast-post-cast hybrid beam-column node is completed with high quality and efficiency.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A beam-column connection node for a precast-post-cast UHPC hybrid frame structure, characterized in that, It includes fully precast lower-level columns, precast UHPC parts at nodes, fully precast beams, post-cast UHPC parts at nodes, and fully precast upper-level columns. The fully precast lower-level columns and fully precast upper-level columns are respectively fixed to the bottom and top of the precast UHPC parts at nodes. The precast UHPC section of the node includes a base plate, columns, and core tubes. The core tubes are fixed at the top center of the base plate, and the columns are fixed at the top of the base plate and surround the core tubes. A gap is left between the columns and the core tubes. The columns are provided with notches for inserting longitudinal steel bars at the ends of the fully precast beams. The post-cast UHPC section of the node is cast in the gap between the columns, the end faces of the fully precast beams, and the outer periphery of the core tubes, and wraps the longitudinal steel bars.

2. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, The four corners of the precast UHPC section of the node are provided with multiple through reserved holes, and the multiple vertical steel bars extending from the top of the fully precast lower column pass through the multiple reserved holes one by one.

3. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 2, characterized in that, The lower end of the fully prefabricated upper column is pre-embedded with multiple sleeves, and each sleeve corresponds to a vertical reinforcing bar. The vertical reinforcing bars are inserted into the corresponding sleeves after passing through the prefabricated UHPC part of the node.

4. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 3, characterized in that, High-strength grout is injected into both the reserved hole and the casing.

5. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, A grouting layer is provided between the top of the fully precast lower column and the bottom of the node precast UHPC part, and between the bottom of the fully precast upper column and the top of the node precast UHPC part.

6. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, The bottom surface shape and dimensions of the base plate are the same as the cross-sectional shape and dimensions of the fully prefabricated lower column, the height of the column is the same as the height of the fully prefabricated beam, and the width of the notch is the same as the width of the fully prefabricated beam.

7. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, The outer wall dimension of the core tube on the side closest to the fully precast beam is adapted to the required dimensions for the lap splicing of the longitudinal reinforcement of the fully precast beam.

8. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, The number of notches is the same as the number of fully precast beams, and the positions of the notches are set on the side walls of the columns according to the positions where the fully precast beams are to be placed.

9. The beam-column connection node of the precast-post-cast UHPC hybrid frame structure as described in claim 1, characterized in that, The longitudinal reinforcing bars of the precast beam pass through the notch and are welded to the core tube.

10. A construction method for beam-column connection nodes in a precast-post-cast UHPC hybrid frame structure, characterized in that, Includes the following steps: Step 1: Construct fully precast lower-level columns, precast UHPC joints, fully precast beams, and fully precast upper-level columns; Step 2: Lay the first grout layer on the top surface of the already constructed fully prefabricated lower column, insert the reserved holes of the prefabricated UHPC part of the node into the vertical steel bars of the fully prefabricated lower column, and install the prefabricated UHPC part of the node on the top surface of the first grout layer. Step 3: Inject the first high-strength grout into the reserved holes of the precast UHPC section of the node and cure it properly; Step 4: Install the fully precast beam into the notch of the column of the precast UHPC section at the node and on the bottom plate, and weld the longitudinal steel bars to the core tube. Step 5: Pour the UHPC portion into the gap between the end face of the column, the fully precast beam and the outer periphery of the core tube, wrap the longitudinal steel bars, and cure in place; Step 6: Lay a second grout layer on the top surface of the precast UHPC section of the node, install the fully precast upper column, insert the sleeve pre-embedded in the lower part of the fully precast upper column into the vertical steel bars of the fully precast lower column, inject the second high-strength grout into the sleeve, and cure it in place to complete the node construction.

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