Prefabricated wall panel dry connection node installed on beam top

Abstract

The present invention discloses a prefabricated wall panel dry-type connection node installed on the top of a beam, wherein a node lower connection component and a support component are installed between a first prefabricated wall panel and a supporting beam, and a node upper connection component is installed between a second prefabricated wall panel and the supporting beam; the node lower connection component comprises a sliding screw fixedly connected to the first prefabricated wall panel, and the sliding screw is connected to a lower adapter fixedly connected to the supporting beam; the supporting component comprises a load-bearing bolt connected to the supporting beam at one end, a lower load-bearing member is installed on the load-bearing bolt, and the other end of the lower load-bearing member extends into the lower side of the first prefabricated wall panel and is connected to the first prefabricated wall panel; the node upper connection component comprises an upper sliding member and an upper adapter; the connection node is three-dimensionally adjustable, has good tolerance, and is easy to install; the deformation of the wall panel and the connection node is coordinated with the deformation of the main structure; the applicability of the external wall panel system is improved, and it is earthquake-resistant, safe and reliable, fire-proof, durable and beautiful; it is easy to install, lightweight, and cost-effective.

Description

Technical Field

[0001] The invention relates to a prefabricated wall panel connection component, in particular to a prefabricated wall panel dry connection node. Background Art

[0002] At present, there are many types of prefabricated external wall panels and connection methods in prefabricated buildings across the country, but the common problems are that the components are heavy, the manufacturing and processing costs of the connection accessories are high, the connection nodes are complicated and difficult to install, and even the connection parts are unreasonable, which makes the entire connection system pose a certain safety hazard to construction and installation, and even to structure and use and maintenance.

[0003] The key difficulties in connecting the nodes of external wall panels for reinforced concrete structural systems or steel beam structural systems are complex production and high cost, difficult interface assembly and chaotic levels; poor three-dimensional adjustment performance, poor tolerance and inconvenient installation; it is difficult to coordinate the deformation of wall panels and connection nodes with the deformation of the main structure; which reduces the applicability of the external wall panel system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a prefabricated wall panel dry-type connection node for beam top installation which has good tolerance and is convenient to install.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a prefabricated wall panel dry connection node installed on the top of the beam is used to connect the first prefabricated wall panel, the second prefabricated wall panel and the supporting beam, a node lower connection component is installed between the bottom end of the first prefabricated wall panel and the top end of the supporting beam, a supporting component is installed between the bottom end of the first prefabricated wall panel and the top end of the supporting beam, and a node upper connection component is installed between the top end of the second prefabricated wall panel and the top end of the supporting beam;

[0006] The node lower connection assembly comprises a sliding screw fixedly connected to the bottom end of the first prefabricated wall panel, and the sliding screw is connected to a lower adapter fixedly connected to the support beam;

[0007] The support assembly includes a load-bearing bolt connected to the support beam at one end, a lower load-bearing member is installed on the load-bearing bolt, and the other end of the lower load-bearing member extends below the first prefabricated wall panel and is connected to the first prefabricated wall panel;

[0008] The node upper connection assembly includes an upper sliding member fixedly connected to the top end of the second prefabricated wall panel, and the upper sliding member is connected to an upper adapter fixedly connected to the support beam.

[0009] As a preferred technical solution, the bottom end of the first prefabricated wall panel is pre-embedded with a wall panel embedded part welded to the sliding screw, and the lower adapter is provided with a vertically extending lower rotating part connecting long hole, and the free end of the sliding screw passes through the lower rotating part connecting long hole and is threadedly connected to a tightening nut resting on the lower adapter; the support beam is a steel beam or a reinforced concrete beam with a beam top embedded part pre-embedded at the top, and the lower adapter is welded to the top of the steel beam or the beam top embedded part.

[0010] As a preferred technical solution, the lower adapter includes an L-shaped lower adapter base, and a triangular reinforcing rib is arranged on both sides of the L-shaped lower adapter base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped lower adapter base, and the lower adapter connecting long hole is arranged on the panel of the L-shaped lower adapter base facing the sliding screw.

[0011] As a preferred technical solution, the support beam is a steel beam or a reinforced concrete beam with a beam top embedded part pre-embedded at the top, the bottom end of the load-bearing bolt is welded to the top of the steel beam or the beam top embedded part, an internal thread sleeve matching the thread of the load-bearing bolt is installed on the lower load-bearing part, a limiting nut pressed on the lower load-bearing part is installed on the top of the load-bearing bolt, and the bottom end of the first prefabricated wall panel is pre-embedded with a wall panel embedded part welded to the lower load-bearing part.

[0012] As a preferred technical solution, the lower load-bearing member includes a lower load-bearing base plate, the two long sides of the lower load-bearing base plate are vertically provided with side guard plates extending downward, an end guard plate fixedly connected to the lower load-bearing base plate is arranged between the two ends of the side guard plates, a reinforcing plate arranged parallel to the end guard plates is fixedly connected between the middle parts of the two side guard plates, the reinforcing plate is fixedly connected to the lower load-bearing base plate, and four connecting plates are circumferentially distributed on the outer wall of the inner thread sleeve, which are respectively perpendicular to the reinforcing plate, the side guard plates and the end guard plates.

[0013] As a preferred technical solution, the lower load-bearing member includes two lower load-bearing base plates arranged in parallel, a side guard plate is vertically provided between the two long edges of the two lower load-bearing base plates, an end guard plate fixedly connected to the lower load-bearing base plates is provided between the two ends of the side guard plates, a reinforcing plate arranged parallel to the end guard plates is fixedly connected between the middle parts of the two side guard plates, and the upper and lower edges of the reinforcing plate are respectively fixedly connected to the two lower load-bearing base plates.

[0014] As a preferred technical solution, the top of the second prefabricated wall panel is pre-embedded with a wall panel embedded part welded to the upper sliding part; a bolt fastening assembly is installed between the upper sliding part and the upper adapter; the support beam is a steel beam or a reinforced concrete beam with a beam top embedded part pre-embedded at the top; the upper adapter is welded to the top of the steel beam or the beam top embedded part.

[0015] As a preferred technical solution, the upper sliding member includes an L-shaped upper sliding base, and a triangular reinforcing rib is arranged on both sides of the L-shaped upper sliding base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper sliding base, and a vertically extending upper sliding member connecting long hole is arranged on the panel of the L-shaped upper sliding base facing the upper adapter.

[0016] As a preferred technical solution, the upper adapter includes an L-shaped upper adapter base, and a triangular reinforcing rib is arranged on both sides of the L-shaped upper adapter base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper adapter base, and a laterally extending upper adapter connecting long hole is arranged on the panel of the L-shaped upper adapter base facing the upper sliding member.

[0017] As a preferred technical solution, a node installation reserved opening is provided at the bottom end of the first prefabricated wall panel, and the lower opening of the node installation reserved opening faces the top end of the second prefabricated wall panel; the sliding screw, the lower load-bearing member and the upper sliding member all extend into the node installation reserved opening.

[0018] Due to the adoption of the above technical solution, the dry connection node of the prefabricated wall panel installed on the top of the beam is used to connect the first prefabricated wall panel, the second prefabricated wall panel and the supporting beam, a node lower connection component is installed between the bottom end of the first prefabricated wall panel and the top end of the supporting beam, a supporting component is installed between the bottom end of the first prefabricated wall panel and the top end of the supporting beam, and a node upper connection component is installed between the top end of the second prefabricated wall panel and the top end of the supporting beam; the node lower connection component includes a sliding screw fixedly connected to the bottom end of the first prefabricated wall panel, and the sliding screw is connected to a lower adapter fixedly connected to the supporting beam; the supporting component includes A load-bearing bolt with one end connected to the support beam, a lower load-bearing member is installed on the load-bearing bolt, the other end of the lower load-bearing member extends under the first prefabricated wall panel and is connected to the first prefabricated wall panel; the node upper connection component includes an upper sliding member fixedly connected to the top of the second prefabricated wall panel, and the upper sliding member is connected to an upper adapter fixedly connected to the support beam; this connection node is three-dimensionally adjustable, has good tolerance and is easy to install; the deformation of the wall panel and the connection node is coordinated with the deformation of the main structure; the applicability of the external wall panel system is improved, and it is earthquake-resistant, safe and reliable, fire-proof, durable and beautiful; it is easy to install, lightweight and cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0020] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the node connection component of the first embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a support assembly according to a first embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the connection components on the node of the first embodiment of the present invention;

[0024] Figure 5 is a side view of the first embodiment of the present invention;

[0025] Figure 6 yes Figure 5 Middle AA section view;

[0026] Figure 7 is a side view of the lower load-bearing member of an embodiment of the present invention;

[0027] Figure 8 yes Figure 7 Bottom view of

[0028] Fig. 9 is a schematic diagram of the structure of the node connection component of the second embodiment of the present invention;

[0029] Fig.10 is a schematic structural diagram of a support assembly according to a second embodiment of the present invention;

[0030] Fig.11 is a schematic diagram of the structure of the connection components on the node of the second embodiment of the present invention;

[0031] Fig.12 It is another structural schematic diagram of a load-bearing member according to an embodiment of the present invention;

[0032] Fig.13 yes Fig.12 Middle BB section view;

[0033] In the figure: 11-first prefabricated wall panel; 12-second prefabricated wall panel; 13-reinforced concrete beam; 14-embedded part of wall panel; 15-embedded part of beam top; 16-steel beam; 21-sliding screw; 22-lower adapter; 23-tightening nut; 24-lower rotating part connecting long hole; 31-lower load-bearing part; 32-load-bearing bolt; 33-inner thread sleeve; 34-lower load-bearing base plate; 35-side guard plate; 36-limiting nut; 37-end guard plate; 38-reinforcement plate; 39-connecting plate; 41-upper sliding part; 42-upper adapter; 43-upper sliding part connecting long hole; 44-upper rotating part connecting long hole. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described only by way of illustration. Needless to say, those of ordinary skill in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0035] Embodiment 1:

[0036] like Figure 1 , Figure 5 and Figure 6 As shown, the prefabricated wall panel dry connection node installed on the beam top is used to connect the first prefabricated wall panel 11, the second prefabricated wall panel 12 and the supporting beam, a node lower connection component is installed between the bottom end of the first prefabricated wall panel 11 and the top end of the supporting beam, a supporting component is installed between the bottom end of the first prefabricated wall panel 11 and the top end of the supporting beam, and a node upper connection component is installed between the top end of the second prefabricated wall panel 12 and the top end of the supporting beam; Figure 2 As shown, the node lower connection assembly includes a sliding screw 21 connected to the bottom end of the first prefabricated wall panel 11, and the sliding screw 21 is connected to a lower adapter 22 connected to the support beam; Figure 3 As shown, the support assembly includes a load-bearing bolt 32 connected to the support beam at one end, a lower load-bearing member 31 is installed on the load-bearing bolt 32, and the other end of the lower load-bearing member 31 extends under the first prefabricated wall panel 11 and is connected to the first prefabricated wall panel 11; Figure 4 As shown, the node upper connection assembly includes an upper sliding member 41 connected to the top end of the second prefabricated wall panel 12, and the upper sliding member 41 is connected to an upper adapter 42 connected to the support beam.

[0037] The bottom end of the first prefabricated wall panel 11 is pre-embedded with a wall panel embedded part 14 welded to the sliding screw 21, and a vertically extending lower turning part connecting long hole 24 is provided on the lower adapter 22. The free end of the sliding screw 21 passes through the lower turning part connecting long hole and is threadedly connected with a tightening nut 23 that rests on the lower adapter 22. The longitudinal installation position of the first prefabricated wall panel 11 can be adjusted through the lower turning part connecting long hole 24; the supporting beam is a reinforced concrete beam 13 with a beam top embedded part 15 pre-embedded at the top, and the lower adapter 22 is welded to the beam top embedded part 15.

[0038] The lower adapter 22 includes an L-shaped lower adapter base, and a triangular reinforcing rib is arranged on both sides of the L-shaped lower adapter base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped lower adapter base, and the lower transfer member connecting long hole 24 is arranged on the panel of the L-shaped lower adapter base facing the sliding screw 21.

[0039] The support beam is a reinforced concrete beam 13 with a beam top embedded part 15 pre-embedded at the top, the bottom end of the load-bearing bolt 32 is welded to the beam top embedded part 15, the lower weighing part 31 is equipped with an internal thread sleeve 33 threadedly matched with the load-bearing bolt 32, the top of the load-bearing bolt 32 is equipped with a limiting nut 36 pressed on the lower weighing part 31, and the bottom end of the first prefabricated wall panel 11 is pre-embedded with a wall panel embedded part welded to the lower load-bearing part 31.

[0040] like Figure 7 and Figure 8 As shown, the lower load-bearing member 31 includes a lower load-bearing base plate 34, and the two long sides of the lower load-bearing base plate 34 are vertically provided with side guard plates 35 extending downward, and an end guard plate 37 fixedly connected to the lower load-bearing base plate 34 is arranged between the two ends of the side guard plates 35, and a reinforcing plate 38 arranged parallel to the end guard plates 37 is fixedly connected between the middle parts of the two side guard plates 35, and the reinforcing plate 38 is fixedly connected to the lower load-bearing base plate 34. The outer wall of the inner thread sleeve 33 is circumferentially distributed with four connecting plates 39 respectively arranged vertically with the reinforcing plate, the side guard plates and the end guard plates.

[0041] like Fig.12 and Fig.13 As shown, the lower load-bearing member 31 includes two lower load-bearing base plates 34 arranged in parallel, a side guard plate 35 is vertically provided between the two long edges of the two lower load-bearing base plates 34, an end guard plate 37 fixedly connected to the lower load-bearing base plates 34 is provided between the two ends of the side guard plates, a reinforcing plate 38 arranged parallel to the end guard plate 37 is fixedly connected between the middle parts of the two side guard plates 35, and the upper and lower edges of the reinforcing plate 38 are respectively fixedly connected to the two lower load-bearing base plates 34.

[0042] The top of the second prefabricated wall panel 12 is pre-embedded with a wall panel embedded part 14 welded to the upper sliding part 41; a bolt fastening assembly is installed between the upper sliding part 41 and the upper adapter 42; the support beam is a reinforced concrete beam 13 with a beam top embedded part 15 pre-embedded at the top; the upper adapter 42 is welded to the beam top embedded part 15.

[0043] The upper sliding member 41 includes an L-shaped upper sliding base, and a triangular reinforcing rib is provided on both sides of the L-shaped upper sliding base, and the two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper sliding base, and a vertically extending upper sliding member connecting long hole 43 is provided on the panel of the L-shaped upper sliding base facing the upper adapter 42. The upper adapter 42 includes an L-shaped upper adapter base, and a triangular reinforcing rib is provided on both sides of the L-shaped upper adapter base, and the two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper adapter base, and a horizontally extending upper transfer member connecting long hole 44 is provided on the panel of the L-shaped upper adapter base facing the upper sliding member 41.

[0044] The bolt fastening assembly includes a fastening bolt passing through the upper sliding member connecting long hole 43 and the upper rotating member connecting long hole 44, and a fastening nut is installed on the fastening bolt. The longitudinal installation position of the second prefabricated wall panel 12 can be adjusted through the upper sliding member connecting long hole 43, and the lateral installation position of the second prefabricated wall panel 12 can be adjusted through the upper rotating member connecting long hole 44.

[0045] A node installation reserved opening is provided at the bottom end of the first prefabricated wall panel 11, and the lower opening of the node installation reserved opening faces the top end of the second prefabricated wall panel 12; the sliding screw 21, the lower load-bearing member 31 and the upper sliding member 41 all extend into the node installation reserved opening.

[0046] This connection node adopts dry connection point support, which is a flexible support method that can adapt to the deformation capacity of the main structure. The point-supported external wall panel has the advantages of clear force on the wall panel components and connection nodes, can fully adapt to the deformation of the main structure, simple construction and installation, and controllable accuracy and quality. The node design meets the goal of not yielding under rare earthquakes: elastic for small earthquakes, elastic for medium earthquakes, and not yielding for large earthquakes.

[0047] Through this connection node, the skeleton of the first prefabricated wall panel 11, the skeleton of the second prefabricated wall panel 12 and the supporting beam of the main structure of the house can be connected as a whole. The sliding part and the adapter are connected by bolts and are designed with adjustment long holes for easy installation. This connection piece can not only ensure the overall stability and strength of the connection between the beam column wall and the wall panel, but also, compared with the welding method, the method of bolt installation or anchor bolt + local welding can better absorb the deformation energy of the wall panel and beam bolt, so that the node deformation of the wall panel under various stress conditions is coordinated with the deformation of the main structure. This node has a reasonable structure, is easy to install, saves materials, reduces costs, and is suitable for popularization and application.

[0048] This connection node changes the conventional practice of common external wall panels, making the connection of external wall panels more reasonable, more convenient for construction and installation, saving materials, reducing costs, increasing installation speed, and saving labor. This connector can not only ensure the overall stability and safety of the assembly connection between the main structure and the wall panel, but also ensure that the node deformation is coordinated with the main structure deformation under various stress conditions. This connector and the connection installation method can be used in reinforced concrete frame structures, frame shear wall structures and shear wall structures, as well as external wall panels of various steel structure systems.

[0049] Embodiment 2:

[0050] When the support beam is a steel beam 16, the connection node can also be applied, and a lot of embedded parts can be reduced, the process is simpler and the cost is lower.

[0051] like Fig. 9 As shown, the support beam is a steel beam 16 , and the lower adapter 22 is welded to the top of the steel beam 16 or the beam top embedded part 15 .

[0052] like Fig.10 As shown, the support beam is a steel beam 16 , and the bolt head of the load-bearing bolt 32 is welded to the top end of the steel beam 16 .

[0053] like Fig.11 As shown, the support beam is a steel beam 16 , and the upper adapter 42 is welded to the top end of the steel beam 16 .

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The prefabricated wall panel dry connection node installed on the beam top is used to connect the first prefabricated wall panel, the second prefabricated wall panel and the supporting beam, characterized in that: A node lower connection component is installed between the bottom end of the first prefabricated wall panel and the top end of the support beam, a support component is installed between the bottom end of the first prefabricated wall panel and the top end of the support beam, and a node upper connection component is installed between the top end of the second prefabricated wall panel and the top end of the support beam; The node lower connection assembly comprises a sliding screw fixedly connected to the bottom end of the first prefabricated wall panel, and the sliding screw is connected to a lower adapter fixedly connected to the support beam; The support assembly includes a load-bearing bolt connected to the support beam at one end, a lower load-bearing member is installed on the load-bearing bolt, and the other end of the lower load-bearing member extends below the first prefabricated wall panel and is connected to the first prefabricated wall panel; The node upper connection assembly comprises an upper sliding member fixedly connected to the top end of the second prefabricated wall panel, and the upper sliding member is connected to an upper adapter fixedly connected to the support beam; The bottom end of the first prefabricated wall panel is pre-embedded with a wall panel embedded part welded to the sliding screw, the lower adapter is provided with a vertically extending lower rotating part connecting long hole, the free end of the sliding screw passes through the lower rotating part connecting long hole and is threadedly connected with a tightening nut abutting against the lower adapter; the support beam is a steel beam or a reinforced concrete beam with a beam top embedded part pre-embedded at the top, and the lower adapter is welded to the top of the steel beam or the beam top embedded part; The top of the second prefabricated wall panel is pre-embedded with a wall panel embedded part welded to the upper sliding part; a bolt fastening assembly is installed between the upper sliding part and the upper adapter; the support beam is a steel beam or a reinforced concrete beam with a beam top embedded part pre-embedded at the top; the upper adapter is welded to the top of the steel beam or the beam top embedded part.

2. The prefabricated wall panel dry connection node installed on the top of the beam according to claim 1, characterized in that: The lower transfer member includes an L-shaped lower transfer base, and a triangular reinforcing rib is arranged on both sides of the L-shaped lower transfer base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped lower transfer base, and the lower transfer member connecting long hole is arranged on the panel of the L-shaped lower transfer base facing the sliding screw.

3. The prefabricated wall panel dry connection node installed on the top of the beam according to claim 1, characterized in that: The supporting beam is a steel beam or a reinforced concrete beam with a beam top embedded part at the top, the bottom end of the load-bearing bolt is welded to the top of the steel beam or the beam top embedded part, an internal thread sleeve matching the thread of the load-bearing bolt is installed on the lower load-bearing part, a limiting nut pressed on the lower load-bearing part is installed on the top of the load-bearing bolt, and the bottom end of the first prefabricated wall panel is embedded with a wall panel embedded part welded to the lower load-bearing part.

4. The prefabricated wall panel dry connection node installed on the top of the beam according to claim 3, characterized in that: The lower load-bearing member includes a lower load-bearing base plate, and the two long edges of the lower load-bearing base plate are vertically provided with side guard plates extending downward, an end guard plate fixedly connected to the lower load-bearing base plate is arranged between the two ends of the side guard plates, a reinforcing plate arranged parallel to the end guard plates is fixedly connected between the middle parts of the two side guard plates, the reinforcing plate is fixedly connected to the lower load-bearing base plate, and four connecting plates are circumferentially distributed on the outer wall of the inner thread sleeve and are respectively vertically arranged with the reinforcing plate, the side guard plates and the end guard plates.

5. The prefabricated wall panel dry connection node installed on the beam top according to claim 3, characterized in that: The lower load-bearing member includes two lower load-bearing base plates arranged in parallel, a side guard plate is vertically arranged between the two long edges of the two lower load-bearing base plates, an end guard plate fixedly connected to the lower load-bearing base plates is arranged between the two ends of the side guard plates, a reinforcing plate arranged parallel to the end guard plates is fixedly connected between the middle parts of the two side guard plates, and the upper and lower edges of the reinforcing plate are respectively fixedly connected to the two lower load-bearing base plates.

6. The prefabricated wall panel dry connection node installed on the top of the beam according to claim 1, characterized in that: The upper sliding member includes an L-shaped upper sliding base, and a triangular reinforcing rib is arranged on both sides of the L-shaped upper sliding base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper sliding base, and a vertically extending upper sliding member connecting long hole is arranged on the panel of the L-shaped upper sliding base facing the upper adapter.

7. The prefabricated wall panel dry connection node installed on the top of the beam according to claim 1, characterized in that: The upper adapter includes an L-shaped upper adapter base, and a triangular reinforcing rib is arranged on both sides of the L-shaped upper adapter base. The two right-angled sides of the triangular reinforcing rib are welded to the two right-angled sides of the L-shaped upper adapter base, and a laterally extending upper adapter connecting long hole is arranged on the panel of the L-shaped upper adapter base facing the upper sliding member.

8. The prefabricated wall panel dry connection node installed on the top of the beam according to any one of claims 1 to 7, characterized in that: A node installation reserved opening is provided at the bottom end of the first prefabricated wall panel, and the lower opening of the node installation reserved opening faces the top end of the second prefabricated wall panel; the sliding screw, the lower load-bearing member and the upper sliding member all extend into the node installation reserved opening.

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