A compression-fiber recycled concrete precast column connecting joint structure and a construction method thereof

Abstract

The application relates to the technical field of concrete prefabricated column connecting nodes, in particular to a compression-fiber recycled concrete prefabricated column connecting node structure and a construction method thereof, wherein the compression-fiber recycled concrete prefabricated column connecting node structure comprises a prefabricated column main body, a mounting frame, a height adjusting assembly and an insertion clamping assembly; the mounting frame is used for mounting a cross beam; the height adjusting assembly comprises an adjusting mechanism and a fixing mechanism and is used for adjusting and locking the height of the mounting frame; the insertion clamping assembly comprises a linkage mechanism, a clamping mechanism and a pre-tightening mechanism; the clamping mechanism is arranged on the mounting frame; the linkage mechanism drives the clamping unit to clamp the prefabricated column main body when the cross beam is inserted; and the pre-tightening mechanism provides a pre-tightening force between adjacent clamping units. The application can flexibly adjust the height, automatically clamps when the cross beam is inserted, and has high connection reliability.

Description

Technical Field

[0001] This invention relates to the field of connection nodes for precast concrete columns, specifically to a connection node structure and construction method for a compression-fiber recycled concrete precast column. Background Technology

[0002] With the deepening of the green and low-carbon transformation of the construction industry, compressed fiber-recycled concrete (CFRAC) is gradually becoming an important alternative to traditional concrete due to its significant advantages in mechanical properties, environmental benefits, and cost control. CFRAC achieves synergistic enhancement of matrix densification and aggregate force chain effect through fiber incorporation and compression casting processes, and has broad application prospects.

[0003] However, existing CFRAC precast columns still have significant shortcomings in practical engineering applications. Firstly, during installation, the connection height of the beams often needs fine-tuning based on site conditions. Traditional precast column connection nodes typically use fixed mounting brackets, which cannot flexibly adapt to installation requirements with different beam heights, resulting in low construction efficiency and difficulty in guaranteeing accuracy. Secondly, at the connection nodes between the beams and precast columns, existing technologies mostly use rigid fixing methods such as bolts or welding, lacking an adaptive adjustment mechanism for the clamping force during the connection process. This makes it difficult to ensure that the clamping mechanism provides uniform and stable clamping of the column after the beam is inserted. Summary of the Invention

[0004] The purpose of this invention is to provide a connection node structure and construction method for a compressed fiber recycled concrete precast column, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: On the one hand, a connection node structure for a compression-fiber recycled concrete precast column is provided, comprising: The precast column body is provided with a mounting frame, which is used to install crossbeams; A height adjustment assembly, comprising an adjustment mechanism and a fixing mechanism, wherein the adjustment mechanism is used to adjust the height of the mounting bracket, and the fixing mechanism is used to fix the adjustment mechanism after the adjustment is completed; An insertion clamping assembly is provided, comprising a linkage mechanism, a clamping mechanism, and a pre-tightening mechanism. The clamping mechanism is disposed on the mounting frame. The linkage mechanism is used to drive the clamping mechanism to clamp the precast column body when the crossbeam is inserted into the mounting frame. The clamping mechanism comprises several clamping units. When the crossbeam is inserted into the mounting frame, the clamping units clamp the precast column body. The pre-tightening mechanism is used to provide pre-tightening force between adjacent clamping units.

[0006] Preferably, the precast column body includes CFRAC precast segments, a steel reinforcement frame is erected on the outside of the CFRAC precast segments, a hoisting shell is fitted on the outside of the steel reinforcement frame, and concrete is filled between the hoisting shell and the CFRAC precast segments.

[0007] Preferably, the mounting frame includes an upper connecting frame and a lower connecting frame. The lower connecting frame is fixedly connected to the precast column body by bolts, and the upper connecting frame and the lower connecting frame are connected to each other by an adjustment mechanism.

[0008] Preferably, the adjusting mechanism includes guide rods and movable rods. Several guide rods are arranged around the lower connecting frame. One end of the movable rod is connected to the upper connecting frame. The position of the movable rod corresponds to the guide rod. The movable rod is movably connected to the guide rod. The fixing mechanism is used to fix the relative position of the movable rod and the guide rod.

[0009] Preferably, the guide rod has a plurality of locking holes, and the fixing mechanism is disposed on the movable rod. The fixing mechanism includes fixing bolts, which are disposed on the movable rod. By fixing the fixing bolts to different locking holes, the relative distance between the upper connecting frame and the lower connecting frame can be adjusted.

[0010] Preferably, both the upper connecting frame and the lower connecting frame are provided with annular grooves. The clamping unit includes clamping blocks, and several clamping blocks are provided. The several clamping blocks are all provided in the annular grooves and can slide along the annular grooves. When the linkage mechanism drives the clamping blocks to move closer to each other along the annular grooves, the clamping blocks will clamp the precast column body.

[0011] Preferably, the crossbeam is provided with a T-shaped block, and the upper connecting frame and the lower connecting frame are provided with snap-fit ​​grooves corresponding to the T-shaped block.

[0012] Preferably, the linkage mechanism is disposed in the annular groove. The linkage mechanism includes a trigger block, a linkage rack, a support rod, a linkage gear, a drive gear, and a sliding block. The trigger blocks are disposed on both sides of the T-shaped block. The support rod is used to support the linkage rack. When the T-shaped block is inserted into the snap-fit ​​groove, the trigger block will push the linkage rack to move and cause the support rod to break. The linkage rack and the linkage gear mesh. The linkage gear is used to drive the drive gear to rotate. The drive gear is disposed in the annular groove and has several limiting slide grooves. The sliding block is movably connected to the limiting slide groove. Each sliding block is connected to a clamping block.

[0013] Preferably, the pre-tightening mechanism includes a pre-tightening spring, and several pre-tightening springs are provided, with adjacent clamping blocks connected to each other through the pre-tightening springs.

[0014] On the other hand, a construction method is provided for constructing the connection node structure of the above-mentioned compressed fiber recycled concrete precast column, comprising the following steps: A. Install the precast column body into place and install the mounting bracket onto the precast column body; B. According to the required installation height of the crossbeam, operate the adjustment mechanism in the height adjustment assembly to adjust the height of the mounting frame. After adjusting to the target height, lock and fix the adjustment mechanism through the fixing mechanism in the height adjustment assembly to maintain the current height of the mounting frame. C. Hoist the crossbeam to the mounting frame, align the crossbeam with the insertion end of the mounting frame, and insert the crossbeam horizontally into the mounting frame; D. During the insertion of the crossbeam into the mounting bracket, the linkage mechanism in the insertion clamping assembly is linked with the insertion of the crossbeam. The linkage mechanism drives each clamping unit in the clamping mechanism to slide along the annular groove and move closer to each other to clamp the precast column body. At the same time, the pre-tightening mechanism applies a pre-tightening force between adjacent clamping units to maintain the positional stability and clamping force of each clamping unit in the clamped state, thus completing the construction of the connection node. E. The crossbeam and the precast column body are fixed by connectors.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention realizes the longitudinal flexible adjustment and locking of the mounting frame through the height adjustment component, which effectively solves the construction problem that traditional precast column connection nodes are difficult to adapt to different beam installation heights. At the same time, the linkage mechanism in the insertion clamping component automatically drives multiple clamping units to move evenly towards the column and form a clamp during the beam insertion process. With the cooperation of the pre-tightening mechanism, a pre-tightening force is continuously provided between each clamping unit, so that the node always maintains a stable connection state under dynamic load and temperature change conditions, effectively avoiding connection loosening and interface slippage caused by vibration (or thermal deformation). Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the precast compressed fiber recycled concrete column and the connection structure of the connection node of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the precast compressed fiber-recycled concrete column of the present invention; Figure 3 This is a schematic diagram of the connection node structure of the present invention; Figure 4This is a schematic diagram showing the positions of the movable rod, locking hole, and fixing bolt of the present invention; Figure 5 This is a schematic diagram of the position structure of the annular groove and clamping block of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the lower connecting frame of the present invention; Figure 7 This is a schematic diagram of the connection structure of the linkage rack, support rod, linkage gear and drive gear of the present invention; Figure 8 This is a schematic diagram of the sliding block position structure of the present invention; Figure 9 This is a schematic diagram showing the position and structure of the clamping block and preload spring of the present invention; Figure 10 This is a schematic diagram of the positional structure of the crossbeam, T-block, and trigger block of the present invention.

[0017] In the diagram: 1. Precast column body, 2. Mounting frame, 3. Crossbeam, 4. CFRAC precast segment, 5. Steel reinforcement frame, 6. Hoisting shell, 7. Concrete, 8. Upper connecting frame, 9. Lower connecting frame, 10. Bolt, 11. Guide rod, 12. Movable rod, 13. Locking hole, 14. Fixing bolt, 15. Annular groove, 16. Clamping block, 17. T-block, 18. Snap-fit ​​groove, 19. Trigger block, 20. Linkage rack, 21. Support rod, 22. Linkage gear, 23. Drive gear, 24. Sliding block, 25. Limiting groove, 26. Pre-tightening spring, 301. Connecting angle iron. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-10 The present invention provides a technical solution: A connection node structure for a compression-fiber recycled concrete precast column, as shown in the attached specification. Figure 1 As shown, it includes a precast column body 1, which serves as the load-bearing foundation for the entire connection node. The mounting bracket 2 is fixedly installed on the precast column body 1 and is used to install the crossbeam 3. The crossbeam 3 is also fixed to the precast column body 1 through a connector. In this embodiment, the connector is a connecting angle iron 301, which is fixed to the precast column body 1 by bolts.

[0020] The height adjustment assembly includes an adjustment mechanism and a fixing mechanism. The adjustment mechanism is used to adjust the height position of the mounting frame 2 relative to the precast column body 1. After the adjustment is completed, the fixing mechanism locks and fixes the mounting frame 2 to ensure its stability and load-bearing capacity.

[0021] The insertion clamping assembly includes a linkage mechanism, a clamping mechanism, and a pre-tightening mechanism. The clamping mechanism is mounted on the mounting frame 2. The linkage mechanism is triggered when the crossbeam 3 is inserted into the mounting frame 2, thereby driving the clamping mechanism to assist in clamping the precast column body 1 and enhancing the overall integrity of the node connection. The clamping mechanism includes several clamping units. When the crossbeam 3 is inserted into the mounting frame 2, each clamping unit operates synchronously and clamps the precast column body 1. The pre-tightening mechanism provides a continuous and stable pre-tightening force between adjacent clamping units to prevent the clamping units from loosening under vibration or load.

[0022] The precast column body 1 comprises CFRAC precast segments 4 (i.e., compressed fiber recycled concrete precast segments). A steel reinforcement cage 5 is erected on the outer side of the CFRAC precast segments 4, arranged longitudinally and circumferentially to provide sufficient shear and bending resistance. A lifting shell 6, precast from CFRAC, is fitted over the outer side of the steel reinforcement cage 5. This lifting shell 6 serves as an external formwork during casting and facilitates lifting. Concrete 7, made of fine aggregate concrete or grout with the same strength grade as the CFRAC, is filled between the lifting shell 6 and the CFRAC precast segments 4. After curing and hardening, the precast column body 1 forms an integral load-bearing component. Connecting steel bars or embedded parts can be pre-installed at the upper and lower ends of the precast column body 1 to facilitate connection with the foundation or upper-level columns.

[0023] Mounting bracket 2 includes an upper connecting bracket 8 and a lower connecting bracket 9. The lower connecting bracket 9 is fixedly connected to the side wall or embedded part of the precast column body 1 by bolts 10. The bolts 10 are evenly distributed around the circumference of the lower connecting bracket 9 to ensure a firm connection. The upper connecting bracket 8 and the lower connecting bracket 9 are connected to each other by an adjustment mechanism, which simultaneously undertakes the functions of vertical force transmission and height adjustment. The upper connecting bracket 8 is used to support the crossbeam 3, and its top surface is provided with a support surface that matches the end of the crossbeam 3.

[0024] The height adjustment assembly includes a guide rod 11 and a movable rod 12. Several guide rods 11 are provided, preferably six, arranged around the upper surface of the lower connecting frame 9 and evenly distributed along its circumference. Each guide rod 11 is vertically fixed to the lower connecting frame 9. One end (lower end) of the movable rod 12 is connected to the lower surface of the upper connecting frame 8. The position of the movable rod 12 corresponds to that of the guide rod 11, meaning each guide rod 11 corresponds to one movable rod 12. The movable rod 12 is movably connected to the guide rod 11, specifically either the movable rod 12 is sleeved outside the guide rod 11 or the guide rod 11 is sleeved outside the movable rod 12, allowing them to slide relative to each other, thereby achieving the lifting and lowering adjustment of the upper connecting frame 8 relative to the lower connecting frame 9. A fixing mechanism is used to fix the relative position of the movable rod 12 and the guide rod 11. After locking, the relative distance between the upper connecting frame 8 and the lower connecting frame 9 remains constant, thus determining the installation height of the crossbeam 3.

[0025] The guide rod 11 has several locking holes 13 along its length. These locking holes 13 are through holes and are arranged at equal intervals along the guide rod 11. A fixing mechanism is provided on the movable rod 12. The fixing mechanism includes fixing bolts 14, which penetrate the side wall of the movable rod 12 and extend into the locking holes 13 on the guide rod 11. By screwing the fixing bolts 14 into the locking holes 13 at different heights, the fixing bolts 14 are fixed to the hoisting housing 6, thus locking the movable rod 12 and the guide rod 11 in different relative positions. This allows for graded adjustment of the relative distance between the upper connecting frame 8 and the lower connecting frame 9 to accommodate different beam installation heights. During adjustment, first loosen the fixing bolts 14 to allow the movable rod 12 to slide along the guide rod 11. After the upper connecting frame 8 is raised to the required height, align the fixing bolts 14 with the corresponding locking holes 13 and tighten them to complete the locking.

[0026] The clamping mechanism is mounted on the upper connecting frame 8 and the lower connecting frame 9. Both the upper connecting frame 8 and the lower connecting frame 9 have annular grooves 15, which are closed annular grooves surrounding the precast column body 1, with a rectangular or dovetail cross-section. The clamping unit includes clamping blocks 16, of which several (preferably four or six) are provided. These clamping blocks 16 are all positioned within the annular grooves 15 and can slide along them. The inner surface of each clamping block 16 is provided with a friction pad or protruding teeth to increase friction with the outer wall of the precast column body 1. In the initial state, the clamping blocks 16 are evenly distributed along the annular grooves 15, maintaining a certain gap with the outer wall of the precast column body 1, without affecting the installation of the precast column body 1. When the linkage mechanism drives the clamping blocks 16 to move closer together along the annular grooves 15, the inner surfaces of each clamping block 16 simultaneously press against the outer wall of the precast column body 1, thereby generating a clamping force to share the horizontal load and bending moment borne by the mounting frame 2.

[0027] A T-shaped block 17 is provided at the end of the crossbeam 3. The T-shaped block 17 is a transverse protrusion that protrudes outward from the end of the crossbeam 3, and its cross-section is T-shaped. The upper connecting frame 8 and the lower connecting frame 9 are provided with snap-fit ​​grooves 18 corresponding to the T-shaped block 17. The snap-fit ​​grooves 18 are T-shaped grooves that match the shape of the T-shaped block 17. The T-shaped block 17 can be inserted into the snap-fit ​​grooves 18 in the horizontal direction. After insertion, the head of the T-shaped block 17 is locked inside the snap-fit ​​grooves 18 to prevent the crossbeam 3 from detaching vertically, thereby achieving quick positioning and initial connection.

[0028] A linkage mechanism is located within the annular groove 15. This mechanism converts the insertion action of the crossbeam 3 into the closing action of the clamping block 16. The linkage mechanism includes a trigger block 19, a linkage rack 20, a support rod 21, a linkage gear 22, a drive gear 23, and a sliding block 24. Trigger blocks 19 are located on both sides of the T-block 17. Each trigger block 19 is a paddle or protrusion fixed to the side of the T-block 17, positioned opposite the end of the linkage rack 20. The support rod 21 supports the linkage rack 20. The support rod 21 is a thin rod made of brittle material or a breakable pin, which keeps the linkage rack 20 in a ready position, disengaged from the trigger block 19, when no force is applied. When the T-block 17 is inserted into the locking groove 18, the trigger block 19 moves with the T-block 17, pushing the linkage rack 20 along its length and causing the support rod 21 to break under shear force, thus giving the linkage rack 20 the ability to move freely. The linkage rack 20 meshes with the linkage gear 22, which is coaxially fixed with the drive gear 23 or connected via a transmission shaft. The linkage gear 22 drives the drive gear 23 to rotate synchronously. The drive gear 23 is disposed in the annular groove 15. The drive gear 23 is an annular gear or a sector gear, and its end face has several limiting grooves 25. The limiting grooves 25 are arc-shaped or straight inclined grooves. Sliding blocks 24 are movably connected in the limiting grooves 25, and each sliding block 24 is connected to a corresponding clamping block 16. When the drive gear 23 rotates, the groove wall of the limiting groove 25 pushes the sliding block 24 to move radially or circumferentially, thereby driving the clamping block 16 to slide along the annular groove 15. Due to the guiding effect of the limiting groove 25, each sliding block 24 moves towards the center simultaneously, realizing the synchronous clamping of the precast column body 1 by the clamping block 16.

[0029] The pre-tensioning mechanism includes pre-tensioning springs 26, and a plurality of pre-tensioning springs 26 are provided, preferably in the same number as the clamping blocks 16. Adjacent clamping blocks 16 are interconnected by pre-tensioning springs 26. The pre-tensioning springs 26 are tension springs or compression springs. When the clamping blocks 16 are not clamped, the pre-tensioning springs 26 provide a certain initial tension to keep the clamping blocks 16 evenly distributed. When the clamping blocks 16 are brought together and clamped, the pre-tensioning springs 26 are stretched or compressed to generate a reverse pre-tensioning force. This pre-tensioning force can offset the attenuation of clamping force caused by vibration or temperature changes, maintain the positional stability and clamping force of each clamping block 16 in the clamped state, and ensure a long-term reliable auxiliary clamping effect.

[0030] Here, a construction method is provided for constructing the connection node structure of the above-mentioned compressed fiber recycled concrete precast column, comprising the following steps: A. Install the precast column body into place and install the mounting bracket on the precast column body; B. According to the required installation height of the crossbeam, adjust the height of the mounting frame by operating the adjustment mechanism in the height adjustment component. After adjusting to the target height, lock the adjustment mechanism in the height adjustment component to maintain the current height of the mounting frame. C. Hoist the crossbeam to the mounting frame, align the crossbeam with the insertion end of the mounting frame, and insert the crossbeam horizontally into the mounting frame; D. During the insertion of the crossbeam into the mounting frame, the linkage mechanism in the insertion clamping assembly is linked with the insertion of the crossbeam. The linkage mechanism drives each clamping unit in the clamping mechanism to slide along the annular groove and move closer to each other to clamp the precast column body. At the same time, the pre-tightening mechanism applies pre-tightening force between adjacent clamping units to maintain the positional stability and clamping force of each clamping unit in the clamped state, thus completing the construction of the connection node. E. The crossbeam and the precast column body are fixed by connectors.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection node structure for a compressed fiber-recycled concrete precast column, characterized in that, include: The precast column body is provided with a mounting frame, which is used to install crossbeams; A height adjustment assembly, comprising an adjustment mechanism and a fixing mechanism, wherein the adjustment mechanism is used to adjust the height of the mounting bracket, and the fixing mechanism is used to fix the adjustment mechanism after the adjustment is completed; An insertion clamping assembly is provided, comprising a linkage mechanism, a clamping mechanism, and a pre-tightening mechanism. The clamping mechanism is disposed on the mounting frame. The linkage mechanism is used to drive the clamping mechanism to clamp the precast column body when the crossbeam is inserted into the mounting frame. The clamping mechanism comprises several clamping units. When the crossbeam is inserted into the mounting frame, the clamping units clamp the precast column body. The pre-tightening mechanism is used to provide pre-tightening force between adjacent clamping units.

2. The connection node structure of a compression-fiber recycled concrete precast column according to claim 1, characterized in that: The precast column body includes CFRAC precast segments, with a steel reinforcement frame erected on the outside of the CFRAC precast segments, and a hoisting shell fitted on the outside of the steel reinforcement frame. Concrete is filled between the hoisting shell and the CFRAC precast segments.

3. The connection node structure of a compression-fiber recycled concrete precast column according to claim 1, characterized in that: The mounting frame includes an upper connecting frame and a lower connecting frame. The lower connecting frame is fixedly connected to the precast column body by bolts, and the upper connecting frame and the lower connecting frame are connected to each other by an adjustment mechanism.

4. The connection node structure of a compression-fiber recycled concrete precast column according to claim 3, characterized in that: The adjustment mechanism includes guide rods and movable rods. Several guide rods are arranged around the lower connecting frame. One end of the movable rod is connected to the upper connecting frame. The position of the movable rod corresponds to the guide rod. The movable rod is movably connected to the guide rod. The fixing mechanism is used to fix the relative position of the movable rod and the guide rod.

5. The connection node structure of a compression-fiber recycled concrete precast column according to claim 4, characterized in that: The guide rod has several locking holes, and the fixing mechanism is set on the movable rod. The fixing mechanism includes fixing bolts, which are set on the movable rod. By fixing the fixing bolts to different locking holes, the relative distance between the upper connecting frame and the lower connecting frame can be adjusted.

6. The connection node structure of a compression-fiber recycled concrete precast column according to claim 3, characterized in that: Both the upper connecting frame and the lower connecting frame are provided with annular grooves. The clamping unit includes clamping blocks, and several clamping blocks are provided. The several clamping blocks are all provided in the annular grooves and can slide along the annular grooves. When the linkage mechanism drives the clamping blocks to move closer to each other along the annular grooves, the clamping blocks will clamp the precast column body.

7. The connection node structure of a compression-fiber recycled concrete precast column according to claim 6, characterized in that: The crossbeam is provided with a T-shaped block, and the upper connecting frame and the lower connecting frame are provided with snap-fit ​​grooves corresponding to the T-shaped block.

8. The connection node structure of a compression-fiber recycled concrete precast column according to claim 7, characterized in that: The linkage mechanism is disposed in the annular groove. The linkage mechanism includes a trigger block, a linkage rack, a support rod, a linkage gear, a drive gear, and a sliding block. The trigger blocks are disposed on both sides of the T-shaped block. The support rod is used to support the linkage rack. When the T-shaped block is inserted into the snap-fit ​​groove, the trigger block will push the linkage rack to move and cause the support rod to break. The linkage rack and the linkage gear mesh. The linkage gear is used to drive the drive gear to rotate. The drive gear is disposed in the annular groove and has several limiting slide grooves. The sliding block is movably connected to the limiting slide groove. Each sliding block is connected to a clamping block.

9. The connection node structure of a compression-fiber recycled concrete precast column according to claim 6, characterized in that: The pre-tightening mechanism includes a number of pre-tightening springs, and adjacent clamping blocks are interconnected by the pre-tightening springs.

10. A construction method for constructing the connection node structure of the compressed-fiber recycled concrete precast column as described in any one of claims 6 to 9, characterized in that, Includes the following steps: A. Install the precast column body into place and install the mounting bracket onto the precast column body; B. According to the required installation height of the crossbeam, operate the adjustment mechanism in the height adjustment assembly to adjust the height of the mounting frame. After adjusting to the target height, lock and fix the adjustment mechanism through the fixing mechanism in the height adjustment assembly to maintain the current height of the mounting frame. C. Hoist the crossbeam to the mounting frame, align the crossbeam with the insertion end of the mounting frame, and insert the crossbeam horizontally into the mounting frame; D. During the insertion of the crossbeam into the mounting bracket, the linkage mechanism in the insertion clamping assembly is linked with the insertion of the crossbeam. The linkage mechanism drives each clamping unit in the clamping mechanism to slide along the annular groove and move closer to each other to clamp the precast column body. At the same time, the pre-tightening mechanism applies a pre-tightening force between adjacent clamping units to maintain the positional stability and clamping force of each clamping unit in the clamped state, thus completing the construction of the connection node. E. The crossbeam and the precast column body are fixed by connectors.

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