Intelligent integrated pouring construction method for beam-column joint structure and joint reinforcing structure

Abstract

The invention discloses an intelligent integrated pouring construction method for a beam-column joint structure and a joint reinforcing structure, and relates to the technical field of beam-column joint construction.The method comprises the steps that the joint reinforcing structure is determined, specifically, the rigid joint reinforcing structure is selected to form an axial, shearing and bending moment bearing system of a joint; the joint reinforcing structure comprises a metal cylinder arranged in the beam column joint area, an annular connecting component arranged outside the metal cylinder and a stress transmission structure used for connecting the annular connecting component with longitudinal steel bars of a beam and a plate of a floor. The prefabricated metal cylinder is installed at a preset column entering position on site, and the annular connecting component and the floor beam plate longitudinal steel bars are connected and locked according to the connection arrangement scheme and the assembly sequence; and one-time continuous pouring is conducted on the floor beam plate and the joint core area through concrete of the same strength grade according to the floor construction sequence. The construction method has the effects that the construction convenience of the beam-column joint is improved, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of beam-column joint construction technology, and in particular to an intelligent integrated casting construction method for beam-column joint structures and a joint reinforcement structure. Background Technology

[0002] With the development of intelligent construction and prefabricated construction, the demand for manpower on construction sites is gradually decreasing, and more construction processes are being undertaken by intelligent equipment (pouring robots, automatic pumping systems, and assembly machinery).

[0003] During the planar casting of floor beams and slabs, beams and slabs usually use lower strength grade concrete to meet the requirements of bending and crack resistance, while beam-column joints and vertical members usually require higher strength concrete to meet the requirements of axial and local stress.

[0004] Traditional methods require zonal or multiple pours of concrete at key points, which places high demands on intelligent continuous pouring equipment: the equipment needs to frequently switch materials, reprogram, or interrupt operations and replace pumping pipelines, increasing construction complexity and affecting the efficiency of automated construction.

[0005] One existing approach is to add reinforcing steel bars to the joint area. While this can allow for a reduction in the concrete grade at the joint to alleviate the aforementioned problems, it still relies on dense steel bar arrangement, manual on-site binding, or complex temporary isolation measures. Furthermore, it is not very compatible with prefabricated units and continuous robotic operations. Therefore, this application proposes a new technical solution. Summary of the Invention

[0006] To improve the ease of construction and efficiency of beam-column joints, this application provides an intelligent integrated casting construction method and joint reinforcement structure for beam-column joints.

[0007] Firstly, this application provides an intelligent integrated casting construction method for beam-column joint structures, employing the following technical solution: A method for intelligent integrated casting construction of beam-column joint structures includes: Step 1: Determine the node reinforcement structure, which includes: selecting a rigid node reinforcement structure to form the axial, shear, and bending moment bearing system of the node; The node reinforcement structure includes a metal cylinder set in the beam-column node area, an annular connecting member set outside the metal cylinder, and a force transfer structure for connecting the annular connecting member to the longitudinal reinforcement of the beams and slabs of the floor. Step 2, BIM drawing generation, which includes: Based on BIM design, output the metal cylinder and ring connection components, and output the connection layout scheme and assembly sequence of the ring connection components with the longitudinal reinforcement of the beams and slabs of the floor. Step 3, on-site construction, includes: On-site, the prefabricated metal cylinders are installed into the preset column positions, and the annular connecting components are connected and locked to the longitudinal steel bars of the floor beams and slabs according to the connection layout plan and assembly sequence. The same strength grade of concrete was used to continuously pour the floor beams, slabs and joint core areas in one go, following the construction sequence of each floor.

[0008] Optionally, step three, on-site construction, includes: pouring concrete into the metal cylinder.

[0009] Secondly, this application provides a joint reinforcement structure applied to the intelligent integrated casting construction method for beam-column joint structures as described in any of the above-mentioned methods, employing the following technical solution: A joint reinforcement structure applied to the intelligent integrated casting construction method for beam-column joint structures as described in any of the above embodiments, comprising: Metal cylinders are embedded in the joint area of ​​beams and columns; A ring-shaped connecting member, which is arranged around the metal cylinder and is rigid; The load-bearing structure includes the longitudinal reinforcement of the connecting ring members, floor beams, and slabs; The metal cylinder includes a steel cylinder, and protruding structural members are arranged on the outside of the cylinder for embedding in the concrete surrounding the steel cylinder.

[0010] Optionally, the metal cylinder includes an inner cylinder and an outer cylinder sleeved on the inner cylinder, with the inner cylinder and the outer cylinder separated to form an inner interlayer cavity; The annular connecting member includes a circumferential steel mesh plate, structural ring reinforcement, and a joint unit. The circumferential steel mesh plate consists of at least two sets, with one set located in the inner cavity and the other set located outside the outer cylinder. The structural ring reinforcement is vertical and simultaneously surrounds two circumferential steel mesh plates and the outer cylinder. There are multiple structural ring reinforcements distributed around the outer cylinder. The outer cylinder has at least one notch at the bottom for the structural ring reinforcements to pass through. The inner cylinder and outer cylinder are respectively provided with radial holes. The longitudinal steel bars of the floor beams and slabs pass through the radial holes of the circumferential steel mesh and the outer cylinder, and are fixed to the circumferential steel mesh outside the outer cylinder through the force transmission structure. The joint unit is fixed to the end of the longitudinal reinforcement of the beams and slabs on the floor, and the joint unit passes through the radial hole of the inner cylinder and is fixed to the inner cylinder.

[0011] Optionally, the joint unit includes an external threaded pipe, an internal threaded pipe, and an inner top plate. One end of the external threaded pipe is sleeved and fixed to the end of the longitudinal reinforcement of the beam and slab of the floor. The internal threaded pipe passes through the radial hole of the inner cylinder and is threaded to the external threaded pipe at one end. The inner top plate is located at one end of the internal threaded pipe in the inner cylinder.

[0012] Optionally, the inner top plate includes a circular plate and an arc plate. The arc plate is adapted to the curvature of the inner wall of the inner cylinder. The inner side of the arc plate is concave to form a rotating groove. The circular plate is embedded in and rotatably connected to the rotating groove. One end of the internally threaded tube passes through the arc plate and the end is fixed to the circular plate. The diameter of the circular plate is larger than that of the internally threaded tube.

[0013] Optionally, the inner cylinder is provided with a multi-functional inner support for simultaneously rotating multiple internally threaded tubes. The multi-functional inner support includes a sliding rod, a sleeve, and a linkage unit. One end of the sliding rod is located at the end of the circular plate facing the center of the inner cylinder, and the other end extends towards the center of the inner cylinder. The sleeve is fitted onto the sliding rod and is slidably connected. The sliding direction of the sleeve and the sliding rod is the radial direction of the inner cylinder. The linkage unit is located at the center of the inner cylinder and is used to drive multiple sleeves to rotate simultaneously.

[0014] Optionally, the linkage unit includes a central tube, a drive shaft, and a gear transmission structure. The central tube is placed in the inner cylinder and closed at both ends. The drive shaft is rotatably connected to the central tube and is coaxial with the central axis. One end of the sleeve is fixed to a rotating shaft, which radially passes through the central tube and is rotatably connected. The gear transmission structure includes a planar bevel gear coaxially fixed to the drive shaft and an end bevel gear coaxially fixed to the rotating shaft. The end bevel gear meshes with the planar bevel gear.

[0015] In summary, this application includes the following beneficial technical effects: by introducing prefabricated metal cylinders and ring-shaped connecting components into the nodes, the longitudinal reinforcement of the beams and slabs can be directly applied to the metal cylinder-ring component system through mechanical connection at the nodes, thus forming a rigid or semi-rigid force transmission channel. This allows the axial and local shear and bending resistance of the nodes to be borne or shared by the composite components, enabling the floor beams and slabs and the nodes to be cast with the same strength grade of concrete in one go, significantly reducing the need for concrete switching and repeated setting of casting equipment, and facilitating intelligent continuous casting operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the effect after the application of this method. Figure 2 This is a longitudinal section diagram of the metal cylinder of this application; Figure 3 This is a schematic diagram of the structure after multi-functional internal supports are installed in the metal cylinder; Figure 4This is a partial structural diagram of the multifunctional internal support.

[0017] Explanation of reference numerals in the attached drawings: 1. Metal cylinder; 11. Inner cylinder; 12. Outer cylinder; 2. Annular connecting member; 21. Circular steel mesh plate; 22. Structural ring reinforcement; 23. Joint unit; 231. External threaded pipe; 232. Internal threaded pipe; 233. Inner top plate; 2331. Circular plate; 2332. Arc plate; 3. Lower frame column; 4. Frame beam reinforcement; 5. Node area concrete structure; 6. Beam and slab area concrete; 7. Upper frame column; 8. Multifunctional internal brace; 81. Sliding rod; 82. Sleeve; 83. Linkage unit; 831. Central tube; 832. Drive shaft; 833. Planar bevel gear; 834. End bevel gear. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0019] This application discloses an intelligent integrated casting construction method for beam-column joint structures.

[0020] Reference Figure 1 The intelligent integrated casting construction method for beam-column joint structures includes: Step 1: Determine the node reinforcement structure, which includes: selecting a rigid node reinforcement structure to form the axial, shear, and bending moment bearing system of the node; The node reinforcement structure includes a metal cylinder 1 set in the beam-column node area (i.e., in the concrete of the area), an annular connecting member 2 set outside the metal cylinder 1, and a force transfer structure for connecting the annular connecting member 2 to the longitudinal reinforcement of the beams and slabs of the floor.

[0021] It is understood that the aforementioned longitudinal direction in this embodiment refers to the horizontal direction in the horizontal plane, rather than the vertical direction; the node reinforcement structure is described in another structural embodiment of this application, so it will not be repeated here.

[0022] Step 2, BIM drawing generation, which includes: Based on BIM design (i.e., drawing with corresponding software), output metal cylinder 1 and ring connection component 2, and output the connection layout scheme and assembly sequence of the ring connection component with the longitudinal reinforcement of the beams and slabs of the floor.

[0023] Step 3, on-site construction, includes: On-site, the prefabricated metal cylinder 1 is installed into the preset column position. For example, first lay the frame beam steel bars 4, and then place the metal cylinder 1 in the space reserved between several frame beam steel bars 4 nearby, that is, above the lower frame column 3. Connect and lock the ring-shaped connecting member 2 to the longitudinal reinforcement of the floor beams and slabs according to the connection layout scheme and assembly sequence; Following the floor construction sequence, concrete of the same strength grade is used to continuously pour concrete for the floor beams and slabs and the core area of ​​the nodes in one go, forming the concrete structure 5 of the node area and the concrete 6 of the beam and slab area. Then, the construction above the node can be carried out to form the upper frame column 7. Repeat the operation to complete the construction of beam and column nodes layer by layer.

[0024] Based on the above setup, this application introduces a prefabricated metal cylinder 1 and a ring-shaped connecting member 2 into the node, so that the longitudinal reinforcement of the beam and slab can directly act on the metal cylinder 1-ring-member 2 system through mechanical connection at the node, thus forming a rigid or semi-rigid force transmission channel. This allows the axial and local shear and bending resistance of the node to be borne or shared by the composite member, and allows the floor beams and slabs and the node to be cast with the same strength grade of concrete in one go, significantly reducing the need for concrete switching and repeated setting of casting equipment, and facilitating intelligent continuous casting operations.

[0025] In one embodiment of this method, the metal cylinder is a steel cylinder, which is a hollow round or square tube, and may also have a bottom plate. The wall thickness is 6 to 25 mm, and the outer diameter accounts for 20% to 60% of the minimum side length of the column section. The above-mentioned force transmission structure includes mechanical joints, welded parts, sleeves, and iron wire for binding reinforcing bars.

[0026] Meanwhile, in addition to maintaining the cavity inside the steel cylinder, concrete can also be filled to achieve composite stress, so as to realize the steel-concrete combined stress and increase the overall stiffness.

[0027] This application also discloses a node reinforcement structure applied to the intelligent integrated casting construction method for beam-column joint structures as described in any of the above embodiments.

[0028] Reference Figure 1 The node enhancement structure includes: Metal cylinder 1, which is embedded in the joint area of ​​beam and column; The annular connecting member 2 is arranged around the metal cylinder 1 and is rigid; The stress transmission structure includes the connecting ring member 2, the longitudinal reinforcement of the beams and slabs of the floor; The metal cylinder 1 includes a steel cylinder, and protruding structural members are arranged on the outside of the cylinder for embedding in the concrete around the steel cylinder. The protruding structural members can be additional welded / pin-connected column structures to improve the bonding and collaborative working ability between the steel cylinder and the surrounding concrete.

[0029] Reference Figure 2 In another embodiment, the metal cylinder 1 includes an inner cylinder 11 and an outer cylinder 12. After the outer cylinder 12 is fitted, it is separated from the inner cylinder 11 to form an inner interlayer cavity.

[0030] The annular connecting member 2 includes annular steel mesh plate 21, structural ring reinforcement 22 and joint unit 23. In this embodiment, the annular steel mesh plate 21 includes a steel mesh formed by binding / welding multiple annular and vertical steel bars together. There are at least two sets of the mesh. Taking two sets as an example, one set is located in the inner cavity, preferably with the front and back sides tightly attached to the inner cylinder 11 and the outer cylinder 12; the other set is located outside the outer cylinder 12.

[0031] Structural ring reinforcement 22 refers to vertically arranged steel bars bent into a ring structure, which simultaneously surround two circumferential steel mesh panels 21 and the outer cylinder 12. It can be understood that the steel bars of structural ring reinforcement 22 are not pre-formed into rings, but are first bent into U-shapes, inserted, and then bent into a ring at the open end of the U-shape. After forming the ring, it can be welded / tied for fixation. There are multiple structural ring reinforcements 22, evenly distributed around the outer cylinder 12.

[0032] To prevent the outer cylinder 12 from being unable to be laid flat due to the presence of the bottom structure of the structural ring reinforcement 22, a notch is made at the bottom of the outer cylinder 12 for the steel bars of the structural ring reinforcement 22 to pass through.

[0033] The inner cylinder 11 and the outer cylinder 12 are respectively provided with radial holes. Radial holes refer to holes that are opened radially, but in this embodiment, it is preferred that they extend vertically to form elongated holes to improve applicability. The longitudinal steel bars of the floor beams and slabs pass through the radial holes of the circumferential steel mesh 21 and the outer cylinder 12, for example, by extending into the inner cavity. The above-mentioned longitudinal steel bars are fixed to the circumferential steel mesh 21 outside the outer cylinder 12 by a force transmission structure (such as by binding with iron wire).

[0034] Reference Figure 3 The joint unit 23 is fixed to the end of the longitudinal reinforcement of the beam and slab of the floor. The joint unit passes through the radial hole of the inner cylinder 11 and is fixed to the inner cylinder 11.

[0035] Based on the above settings: 1) Due to the presence of the inner cavity, the connection strength between the annular connecting member 2 and the metal cylinder 1 is greater; 2) The longitudinal steel bars of the beams and slabs of the floor are not only connected to the circumferential steel mesh 21 of the ring connection member 2, but also connected to the inner cylinder 11 of the metal cylinder 1, so the connection strength can be further strengthened, that is, the overall structural strength can be enhanced. 3) The radial holes of the inner cylinder 11 and the outer cylinder 12 also allow the concrete inside and outside the metal cylinder 1 to be connected as one, further improving the bonding and collaborative working ability between the metal cylinder 1 and the surrounding concrete.

[0036] Reference Figure 3 and Figure 4 In another embodiment, the connector unit 23 includes an externally threaded tube 231, an internally threaded tube 232, and an inner top plate 233.

[0037] One end of the external threaded pipe 231 is sleeved and fixed to the end of the longitudinal reinforcement of the beam and slab of the floor. The connection between the two can be welded. Therefore, the end of the external threaded pipe 231 that is closer to the longitudinal reinforcement should be outside the outer cylinder 12 to facilitate the installation operation.

[0038] The internally threaded tube 232 passes through the radial hole of the inner cylinder 11 and is threaded at one end to the externally threaded tube 231. The inner top plate 233 is located at one end of the internally threaded tube 232 in the inner cylinder 12.

[0039] When using: First, the external threaded pipe 231 is fitted onto the ends of the longitudinal reinforcing bars facing the nodes. Then, the metal cylinder 1, which has been fitted with the circumferential reinforcing mesh 21 and structural ring reinforcing bars 22, is inserted. Next, the position of the external threaded pipe 231 is adjusted, and the longitudinal reinforcing bars and the circumferential reinforcing bars of the circumferential reinforcing mesh 21 located outside the outer cylinder 12 are fixed by welding / tying. The external threaded pipe 231 is then welded and fixed. After that, the internal threaded pipe 232 is inserted from the radial hole inside the inner cylinder 11 and threadedly connected to the external threaded pipe 231, so that the inner top plate 233 rests against the inner wall of the inner cylinder 11. This completes the connection and fixation between the metal cylinder 1, the annular connecting member 2, and the longitudinal reinforcing bars of the floor beams and slabs. The operation is relatively simple and has strong connection strength.

[0040] In this embodiment, the inner top plate 233 includes a circular plate 2331 and an arc plate 2332. The arc plate 2332 is adapted to the curvature of the inner wall of the inner cylinder 11 so as to fit against the inner wall of the inner cylinder 11. The inner side of the arc plate 2332 is concave to form a rotating groove. The circular plate 2331 is embedded and rotatably connected to the rotating groove. One end of the internal threaded tube 232 passes through the arc plate 2332 and the end is fixed to the circular plate 2331. The diameter of the circular plate 2331 is larger than that of the external threaded tube 231.

[0041] As described above, the inner top plate 233 will not obstruct the rotation of the external threaded pipe 231 to prevent its installation, nor will it separate from the inner wall of the inner cylinder 11, so that after the external threaded pipe 231 and the internal threaded pipe 232 are rotated into place, the structure of this section is not prone to loosening due to excessive force deformation.

[0042] Reference Figure 3 and Figure 4 In another embodiment, a multi-functional inner support 8 for simultaneously rotating multiple internally threaded tubes 232 is provided in the inner cylinder 11. The multi-functional inner support 8 includes a sliding rod 81, a sleeve 82, and a linkage unit 83.

[0043] One end of the sliding rod 81 is fixed (inserted) to the end of the circular plate 2331 facing the center of the inner cylinder 11, and the other end extends towards the center of the inner cylinder 11; the sleeve 82 is sleeved on the sliding rod 81 and is slidably connected, and the sliding direction of the sleeve 82 and the sliding rod 81 is radial to the inner cylinder 11. The linkage unit 83 is located at the center of the inner cylinder 11 and is used to simultaneously drive multiple sleeves 82 to rotate.

[0044] According to the above settings, when installing the internal threaded tube 232, it is no longer necessary to rotate and operate each individual internal threaded tube 232. It is only necessary to activate the linkage unit 83 to drive multiple sleeves 82 to rotate simultaneously. The rotation of the sleeve 82 drives the sliding rod 81 to rotate, which in turn makes the internal threaded tube 232 rotate. And because the sliding rod 81 is slidably connected to the sleeve 82, the internal threaded tube 232 will not be obstructed when it is tightened and moves. On the other hand, after the sliding rod 81 slides into place relative to the sleeve 82, the workers can weld the sliding rod 81 and the sleeve 82 or pin them together through the preset pin hole to prevent them from sliding and to strengthen the internal support of the metal cylinder 1.

[0045] The aforementioned sliding rod 81 can be a square rod, because the sleeve 82 can be a square tube.

[0046] In this embodiment, the linkage unit 83 includes a central tube 831, a transmission shaft 832, and a gear transmission structure. The central tube 831 is placed in the inner cylinder 11 and closed at both ends. The transmission shaft 832 is rotatably connected to the central tube 831 and is coaxial with the central axis. One end of the sleeve 82 is fixed with a rotating shaft, which radially passes through the central tube 831 and is rotatably connected. The gear transmission structure links the transmission shaft 832 and the rotating shaft at the end of the sleeve 82.

[0047] According to the above settings, the staff can hold the central tube 831 and manually or by using the machine to rotate the transmission shaft 832 to rotate multiple sleeves 82 at once, that is, to rotate multiple internally threaded tubes 232.

[0048] In one embodiment, the gear transmission structure includes a planar bevel gear 833 and a matching end bevel gear 834. The planar bevel gear 833 is coaxially fixed to the transmission shaft 832, and the end bevel gear 834 is coaxially fixed to the rotating shaft of the sleeve 82 and meshes with the planar bevel gear.

[0049] Compared to other more complex transmissions achieved through multiple meshing and switching of multi-stage gears, the above structure is relatively simpler.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for intelligent integrated casting construction of beam-column joint structures, characterized in that, include: Step 1: Determine the node reinforcement structure, which includes: selecting a rigid node reinforcement structure to form the axial, shear, and bending moment bearing system of the node; Among them, the node reinforcement structure includes a metal cylinder (1) set in the beam-column node area, an annular connecting member (2) set outside the metal cylinder (1), and a force transfer structure for connecting the annular connecting member (2) with the longitudinal reinforcement of the beams and slabs of the floor. Step 2, BIM drawing generation, which includes: Based on BIM design, output the metal cylinder (1) and the ring connection component (2), and output the connection layout scheme and assembly sequence of the ring connection component (2) with the longitudinal reinforcement of the beams and slabs of the floor. Step 3, on-site construction, includes: On site, the prefabricated metal cylinder (1) is installed into the preset column position, and the ring connecting component (2) is connected and locked to the longitudinal steel bars of the floor beam according to the connection layout scheme and assembly sequence. The same strength grade of concrete was used to continuously pour the floor beams, slabs and joint core areas in one go, following the construction sequence of each floor.

2. The intelligent integrated casting construction method for beam-column joint structures according to claim 1, characterized in that: Step three, on-site construction, includes: pouring concrete into the metal cylinder (1).

3. A joint reinforcement structure applied to the intelligent integrated casting construction method for beam-column joint structures as described in any one of claims 1 or 2, characterized in that: The node enhancement structure includes: Metal cylinder (1), which is embedded in the joint area of ​​beam and column; The annular connecting member (2) is arranged around the metal cylinder (1) and is rigid; The stress transmission structure is connected by a ring-shaped connecting member (2), and the longitudinal reinforcement of the beams and slabs of the floor. The metal cylinder (1) includes a steel cylinder, and protruding structural members for embedding in the concrete around the steel cylinder are arranged on the outside of the cylinder.

4. The node reinforcement structure according to claim 3, characterized in that: The metal cylinder (1) includes an inner cylinder (11) and an outer cylinder (12) sleeved on the inner cylinder (11), and the inner cylinder (11) and the outer cylinder (12) are separated to form an inner interlayer cavity; The annular connecting member (2) includes a circumferential steel mesh plate (21), a structural ring reinforcement (22), and a joint unit (23). The circumferential steel mesh plate (21) consists of at least two sets, one set located in the inner interlayer cavity and the other set located outside the outer cylinder (12). The structural ring reinforcement (22) is vertical and simultaneously surrounds two circumferential steel mesh plates (21) and the outer cylinder (12). There are multiple structural ring reinforcements (22) and they are distributed around the outer cylinder (12). The outer cylinder (12) has at least a notch at the bottom for the structural ring reinforcement (22) to pass through. The inner cylinder (11) and outer cylinder (12) are respectively provided with radial holes. The longitudinal steel bars of the beams and slabs of the floor pass through the radial holes of the circumferential steel mesh (21) and the outer cylinder (12), and are fixed to the circumferential steel mesh (21) outside the outer cylinder (12) through the force transmission structure. The joint unit (23) is fixed to the end of the longitudinal reinforcement of the beam and slab of the floor, and the joint unit (23) passes through the radial hole of the inner cylinder (11) and is fixed to the inner cylinder (11).

5. The node reinforcement structure according to claim 4, characterized in that: The joint unit (23) includes an external threaded pipe (231), an internal threaded pipe (232), and an inner top plate (233). One end of the external threaded pipe (231) is sleeved and fixed to the end of the longitudinal reinforcement of the beam and slab of the floor. The internal threaded pipe (232) passes through the radial hole of the inner cylinder (11) and is threaded to the external threaded pipe (231) at one end. The inner top plate (233) is located at one end of the internal threaded pipe (232) in the inner cylinder (11).

6. The node enhancement structure according to claim 5, characterized in that: The inner top plate (233) includes a circular plate (2331) and an arc plate (2332). The arc plate (2332) is adapted to the curvature of the inner wall of the inner cylinder (11). The inner side of the arc plate (2332) is concave to form a rotating groove. The circular plate (2331) is embedded in and rotatably connected to the rotating groove. One end of the internally threaded tube (232) passes through the arc plate (2332) and the end is fixed to the circular plate (2331). The diameter of the circular plate (2331) is larger than that of the internally threaded tube (232).

7. The node enhancement structure according to claim 6, characterized in that: The inner cylinder (11) is provided with a multi-functional inner support (8) for simultaneously rotating multiple internal threaded tubes (232). The multi-functional inner support (8) includes a sliding rod (81), a sleeve (82) and a linkage unit (83). One end of the sliding rod (81) is located at the end of the circular plate (2331) facing the center of the inner cylinder (11), and the other end extends towards the center of the inner cylinder (11). The sleeve (82) is sleeved on the sliding rod (81) and is slidably connected. The sliding direction of the sleeve (82) and the sliding rod (81) is radial to the inner cylinder (11). The linkage unit (83) is located at the center of the inner cylinder (11) and is used to drive multiple sleeves (82) to rotate simultaneously.

8. The node enhancement structure according to claim 7, characterized in that: The linkage unit (83) includes a central tube (831), a transmission shaft (832), and a gear transmission structure. The central tube (831) is placed in the inner cylinder (11) and closed at both ends. The transmission shaft (832) is rotatably connected to the central tube (831) and is coaxial with the central axis. One end of the sleeve (82) is fixed to a rotating shaft, which radially penetrates the central tube (831) and is rotatably connected. The gear transmission structure includes a planar bevel gear (833) coaxially fixed to the transmission shaft (832) and an end bevel gear (834) coaxially fixed to the rotating shaft. The end bevel gear (834) meshes with the planar bevel gear (833).

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