Dry joint assembly for precast elements

Abstract

This utility model pertains to the field of prefabricated structural systems and is a detachable, anti-slip, and anti-detachment dry connection assembly suitable for prefabricated components. It includes a first prefabricated component and a second prefabricated component, which are adjacent to each other and joined together. The dry connection assembly is arranged sequentially at intervals along the joint between the first and second prefabricated components. Each dry connection assembly includes an anti-slip sleeve, which is vertically embedded in the side of the first prefabricated component. A pre-drilled circular hole is located in the center of the bottom of the anti-slip sleeve, extending downwards through the bottom of the first prefabricated component. A threaded sleeve is pre-embedded on the joint side of the second prefabricated component, and a connecting bolt is threaded onto the threaded sleeve. The upper end of the connecting bolt is inserted into the anti-slip sleeve along the pre-drilled circular hole. A limiting component is provided on the anti-slip sleeve to restrict the movement of the connecting bolt. This assembly features detachability, anti-slip properties, and anti-detachment, improving the structure's energy dissipation capacity, ductility, and post-earthquake rapid repair capabilities.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated structural systems, specifically a detachable, anti-slip, and anti-fall-off prefabricated wall dry connection component. Background Technology

[0002] In recent years, my country has been vigorously promoting the industrialization of construction, actively exploring the development of prefabricated buildings, and promoting prefabricated concrete building systems suitable for industrialized production. Currently, there are two main connection methods for prefabricated buildings: wet connection and dry connection. Wet connection generally has the same performance as cast-in-place construction, but it is complex to construct, expensive, and not environmentally friendly. Dry connection mainly uses bolt connection, embedded steel plate connection, prestressed connection, etc., which do not require secondary pouring on site, are quick to construct, easy to disassemble, and help improve the assembly efficiency of prefabricated structures. Therefore, dry connection has become a current research hotspot.

[0003] Currently, there are two main types of dry connection schemes for prefabricated concrete structures. The first type borrows from the connection methods between components in steel structures. Circular holes along the wall thickness are opened near the horizontal joint in the upper and lower walls, and connecting steel plates are installed on both sides of the wall. A certain number of bolts are then used to sequentially pass through the left connecting steel plate, the upper and lower walls, and the right connecting steel plate to complete the connection. The shear force of the bolts is used to transfer the internal force of the wall. This type of connection scheme can be simply referred to as the splicing bolt connection scheme. Examples include application numbers: 201610662280.1, 201710878700.4, and 201911005661. .2 All adopt a splicing bolt connection scheme; however, this type of connection scheme has problems such as easy shearing damage in the joint connection area, complex connection structure, and high manufacturing precision requirements; The second type of connection scheme uses a bolt to pass through the reserved holes in the upper and lower walls vertically to complete the connection, and uses the axial tension of the bolt to transfer the internal force of the wall. This type of connection scheme can be simply referred to as the through bolt connection scheme; for example, application numbers: 201710229573.5, 201811530624.9 and 201910439288.5 all adopt the through bolt connection scheme; This type of connection scheme has problems such as easy loosening of nuts and bolt warning. Problems such as easy loss of force, severe deformation of steel shims, large horizontal slippage of the wall, and large gaps in the joints exist. To address the shortcomings of the above two connection schemes, a third connection scheme has emerged. This scheme borrows the connection principle of three-in-one furniture fasteners. The screw still passes vertically through a pre-drilled hole in the upper wall, and then the fastening nut is embedded in the pre-drilled hole and tightened to complete the connection. This type of connection scheme can be simply referred to as the fastening nut connection scheme. For example, application numbers 202110809591.7 and 202121611123.0 both use the fastening nut connection scheme. However, this type of connection scheme still has the following shortcomings: although it is used for embedding fastening... The wall opening for the fastening nut has a circular cross-section, but the fastening nut is in direct contact with the surrounding concrete. Under seismic loads, the concrete around the opening is prone to cracking and brittle failure due to excessive force transmitted by the fastening nut, affecting the reliable connection between walls and the seismic performance of the structure. Under seismic loads or continuous vibration, the fastening nut may rotate and loosen due to the absence of a stopcock. When the rotation and loosening reach a certain extent, the fastening nut will be unable to hold the nut of the bolt and will detach. Consequently, the wall will slip or lift due to the failure of the fastening nut connection, causing the wall to lose its load-bearing capacity and the structure to fail to meet seismic requirements.

[0004] Therefore, there is an urgent need for a detachable, anti-slip, and anti-fall-off prefabricated wall dry connection component to solve the above-mentioned technical problems. Utility Model Content

[0005] This utility model aims to solve the above-mentioned problems, thereby providing a detachable, anti-slip, and anti-detachment precast wall dry connection component, which avoids bolt slippage, joint opening, and damage to the concrete around the nodes in precast components. It effectively improves the ductility and energy dissipation capacity of precast components, and successfully realizes the rapid disassembly and replacement of precast components in prefabricated structures after earthquakes, providing technical support for the engineering application and promotion of detachable prefabricated structures.

[0006] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0007] A detachable, anti-slip, and anti-detachment dry-type connection assembly for precast components includes a first precast component and a second precast component, which are adjacent to each other and joined together. The dry-type connection assembly is arranged sequentially at intervals along the joint of the first and second precast components. Each dry-type connection assembly includes an anti-slip sleeve located on the joint side of the first precast component, the anti-slip sleeve being vertically embedded in the side of the first precast component. A pre-drilled circular hole is provided in the center of the bottom of the anti-slip sleeve, extending downwards through the bottom of the first precast component. A threaded sleeve is pre-embedded on the joint side of the second precast component. The threaded sleeve and the reserved round hole are positioned opposite each other. A connecting bolt is threaded onto the threaded sleeve, and the upper end of the connecting bolt is inserted into the anti-slip sleeve along the reserved round hole. A limiting component is provided on the anti-slip sleeve to restrict the movement of the connecting bolt. The limiting component includes an eccentric nut set inside the anti-slip sleeve. A limiting groove is provided on the side of the eccentric nut near the connecting bolt. The upper end of the connecting bolt is stuck in the limiting groove. An inverted T-groove is provided on the other end of the eccentric nut. A limiting recess is provided on the anti-slip sleeve located directly above the inverted T-groove. The limiting recess and the inverted T-groove are connected and a limiting pin is installed together.

[0008] As a preferred embodiment, a further technical solution of this utility model is as follows:

[0009] Preferably, an inwardly recessed slot is provided on the side of the first prefabricated component. The slot has a rectangular structure and is located directly above the limiting recess. The slot is connected to the limiting recess and the inverted T-shaped groove. A rubber filler block is filled in the slot.

[0010] Preferably, the inverted T-groove includes a transverse groove with a rectangular cross-section and a vertical groove with a trapezoidal cross-section. The vertical groove is perpendicular to the transverse groove and is interconnected with it. An upper opening connected to the limiting notch is provided at the upper end of the vertical groove.

[0011] Preferably, the cross-sections of the limiting recess and the limiting pin are both trapezoidal, the limiting pin is adapted to the limiting recess and the vertical groove, and the limiting pin is inserted into the limiting recess and the vertical groove.

[0012] Preferably, the eccentric nut has a cylindrical structure, and the limiting groove includes a horizontal sliding groove provided on the eccentric nut. The horizontal sliding groove passes through the other end face of the eccentric nut away from the inverted T-shaped groove along the axial direction, and a sliding groove opening is provided on the horizontal sliding groove. The opening direction of the sliding groove opening is consistent with that of the upper opening. A vertical sliding groove is provided on the side of the horizontal sliding groove near the inverted T-shaped groove. The vertical sliding groove passes through the eccentric nut radially up and down. The vertical sliding groove and the vertical groove are spaced apart from each other and parallel to each other. The vertical sliding groove and the horizontal sliding groove are connected. A positioning groove is provided on the side of the vertical sliding groove near the horizontal sliding groove.

[0013] Preferably, the connecting bolt includes a screw rod placed in a vertical groove, and a nut placed in a positioning groove is fixedly connected to the upper end of the screw rod, the height of the positioning groove being consistent with the thickness of the nut.

[0014] Preferably, a connecting steel bar is provided inside the first precast component, and the other end of the anti-slip sleeve away from the inverted T-groove is fixedly connected to the connecting steel bar.

[0015] Preferably, the upper end face of the threaded sleeve is flush with the end face of the second prefabricated component.

[0016] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0017] This utility model has the functions of anti-slipping and anti-detachment. When subjected to force, the eccentric nut will not rotate, and at the same time, it can prevent the connecting bolts from slipping along the axial direction. It effectively prevents the precast components from swaying under seismic action, significantly reduces the residual deformation caused by the swaying action of the precast components, significantly reduces the degree of pinching of the hysteresis curve of the precast components, and greatly improves the energy dissipation capacity and ductility of the structure.

[0018] This invention has the advantages of simple connection, fast assembly speed, easy disassembly, easy repair, and replaceability, which is conducive to realizing the detachable function of the structure and the function of rapid repair after earthquake; in addition, the two adjacent precast components are connected by a dry connection component to achieve dry connection, without the need for secondary concrete pouring, which is conducive to the replacement of precast components and the disassembly of the overall structure; and by concentrating energy consumption and damage on the connecting bolts, it is convenient to repair or replace the connecting bolts after a strong earthquake, so as to achieve the purpose of rapid repair after a strong earthquake.

[0019] The connection nodes of the first precast component, the dry connection assembly, and the second precast component of this utility model do not have a large number of steel embedded parts. The connection node has a simple structure and uses less steel, which is conducive to cost control and engineering application. It has the characteristics of clear force transmission path and clear division of force, which makes full use of the mechanical properties of each component and helps to improve the seismic performance of the structure. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the connection structure of this utility model;

[0021] Figure 2 yes Figure 1 Sectional view of AA;

[0022] Figure 3 This is a schematic diagram of the dry connection assembly of this utility model;

[0023] Figure 4 yes Figure 3 BB section view;

[0024] Figure 5 This is a schematic diagram of the structure of the eccentric nut of this utility model;

[0025] In the diagram: 1. First precast component; 2. Second precast component; 3. Butt joint; 4. Dry connection assembly; 5. Anti-slip sleeve; 6. Reserved round hole; 7. Threaded sleeve; 8. Connecting bolt; 9. Limiting assembly; 10. Eccentric nut; 11. Inverted T-slot; 12. Limiting notch; 13. Limiting pin; 14. Slot; 15. Rubber filler block; 16. Horizontal groove; 17. Vertical groove; 18. Horizontal slide; 19. Vertical slide; 20. Positioning groove. Detailed Implementation

[0026] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0027] See Figures 1 to 5 As shown, the technical solution of this utility model is as follows:

[0028] A detachable, anti-slip, and anti-detachment dry connection assembly suitable for precast components includes a first precast component 1 and a second precast component 2, the first precast component 1 and the second precast component 2 being adjacent to each other and butt-jointed; the dry connection assembly 4 is arranged sequentially at intervals along the butt joint 3 of the first precast component 1 and the second precast component 2, the dry connection assembly 4 being used to resist bending and withstand the tensile force generated at the horizontal joint due to the bending of the continuous precast components;

[0029] The dry connection assembly 4 includes an anti-slip sleeve 5, which is located on the mating side of the first precast component 1. The anti-slip sleeve 5 is vertically embedded on the side of the first precast component 1. A connecting steel bar is provided inside the first precast component 1. The other end of the anti-slip sleeve 5 away from the inverted T-groove 11 is fixedly connected to the connecting steel bar. A reserved round hole 6 is machined in the middle of the bottom of the anti-slip sleeve 5, and the reserved round hole 6 penetrates downward through the bottom of the first precast component 1. A threaded sleeve 7 is embedded on the mating side of the second precast component 2. The upper end face of the threaded sleeve 7 is flush with the end face of the mating side of the second precast component 2. The threaded sleeve 7 and the reserved round hole 6 are vertically opposite each other. A connecting bolt 8 is threadedly connected to the threaded sleeve 7. The outer diameter of the connecting bolt 8 is matched with the inner diameter of the reserved round hole 6, and the upper end of the connecting bolt 8 is inserted into the anti-slip sleeve 5 along the reserved round hole 6. A limiting assembly 9 is provided on the anti-slip sleeve 5 to restrict the movement of the connecting bolt 8.

[0030] The limiting component 9 includes an eccentric nut 10 disposed inside the anti-slip sleeve 5. A limiting groove is provided on the side of the eccentric nut 10 near the connecting bolt 8. The upper end of the connecting bolt 8 is stuck in the limiting groove. An inverted T-groove 11 is provided on the other end of the eccentric nut 10. A limiting recess 12 is provided on the anti-slip sleeve 5 located directly above the inverted T-groove 11. The limiting recess 12 and the inverted T-groove 11 are connected and a limiting pin 13 is installed together.

[0031] A recessed slot 14 is provided on the side of the first prefabricated component 1. The slot 14 has a rectangular structure and is located directly above the limiting recess 12. The slot 14 is connected to the limiting recess 12 and the inverted T-shaped groove 11. A rubber filler block 15 is filled in the slot 14.

[0032] The inverted T-groove 11 includes a horizontal groove 16 with a rectangular cross-section and a vertical groove 17 with a trapezoidal cross-section. The vertical groove 17 is perpendicular to the horizontal groove 16 and is interconnected with it. An upper opening connected to the limiting notch 12 is provided at the upper end of the vertical groove 17.

[0033] The cross-sections of the limiting recess 12 and the limiting pin 13 are both trapezoidal. The limiting pin 13 is adapted to the limiting recess 12 and the vertical groove 17, and the limiting pin 13 is inserted into the limiting recess 12 and the vertical groove 17.

[0034] The eccentric nut 10 has a cylindrical structure. The limiting groove includes a horizontal slide groove 18 provided on the eccentric nut 10. The horizontal slide groove 18 passes through the other end face of the eccentric nut 10 away from the inverted T-shaped groove 11 along the axial direction. The horizontal slide groove 18 is provided with a slide groove opening. The opening direction of the slide groove opening is consistent with that of the upper opening. A vertical slide groove 19 is provided on the side of the horizontal slide groove 18 near the inverted T-shaped groove 11. The vertical slide groove 19 passes through the eccentric nut 10 radially up and down. The vertical slide groove 19 and the vertical groove 17 are spaced apart from each other and parallel to each other. The vertical slide groove 19 and the horizontal slide groove 18 are connected. A positioning groove 20 is provided on the side of the vertical slide groove 19 near the horizontal slide groove 18.

[0035] The connecting bolt 8 includes a screw rod placed in a vertical slide groove 19, and a nut placed in a positioning groove 20 is fixedly connected to the upper end of the screw rod. The height of the positioning groove 20 is consistent with the thickness of the nut.

[0036] It should be noted that: the connecting bolt 8, threaded sleeve 7, and rubber filler block 15 are all commercially available standard parts; while the eccentric nut 10, anti-slip sleeve 5, and limit pin 13 are all prefabricated in the factory, and their material is steel; the diameter and strength grade of the connecting bolt 8 are determined by design based on the stress condition of the prefabricated component at the horizontal joint.

[0037] The assembly process is as follows: Screw the connecting bolt 8 downwards into the threaded sleeve 7 embedded in the second prefabricated component 2; hoist the first prefabricated component 1 directly above the second prefabricated component 2 and slowly lower it, so that the connecting bolt 8 passes upwards through the reserved round hole 6 until the nut is located in the anti-slip sleeve 5; put the eccentric nut 10 into the anti-slip sleeve 5, so that the nut slides into the horizontal slide groove 18, and then rotate the eccentric nut 10 so that the screw is placed in the vertical slide groove 19, so that the nut abuts in the positioning groove 20; then align the vertical groove 17 and the limiting notch 12; place the limiting pin 13 in the limiting notch 12 and slide it downwards so that the limiting pin 13 is embedded in the vertical groove 17 of the eccentric nut 10; then embed the rubber filler block 15 into the slot 14.

[0038] This utility model has the functions of anti-slipping and anti-detachment. When subjected to force, the eccentric nut 10 will not rotate, and at the same time, it can prevent the connecting bolt 8 from slipping along the axial direction. It effectively prevents the precast components from swaying under the action of earthquake, significantly reduces the residual deformation caused by the swaying action of the precast components, significantly reduces the degree of pinching of the hysteresis curve of the precast components, and greatly improves the energy dissipation capacity and ductility of the structure.

[0039] This utility model has the advantages of simple connection, fast assembly speed, easy disassembly, easy repair, and replaceability, which is conducive to the realization of detachable structure and rapid post-earthquake repair function; in addition, the two adjacent precast components are connected by dry connection component 4 to achieve dry connection, without the need for secondary concrete pouring, which is conducive to the replacement of precast components and the disassembly of the overall structure; and the energy consumption and damage are concentrated on the connecting bolt 8, which is conducive to the repair or replacement of the connecting bolt 8 after a strong earthquake, so as to achieve the purpose of rapid repair after a strong earthquake.

[0040] The connection node of the first precast component 1, the dry connection assembly 4, and the second precast component 2 of this utility model does not have a large number of steel embedded parts. The connection node has a simple structure and uses less steel, which is conducive to cost control and engineering application. It has the characteristics of clear force transmission path and clear division of force, which makes full use of the mechanical properties of each component and helps to improve the seismic performance of the structure.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A detachable, anti-slip, and anti-detachment dry connection assembly suitable for precast components, comprising a first precast component and a second precast component, wherein the first precast component and the second precast component are adjacent to each other and mated together; characterized in that: Dry connection assemblies are arranged sequentially and at intervals along the butt joint of the first and second precast components. Each dry connection assembly includes an anti-slip sleeve located on the butt joint side of the first precast component. The anti-slip sleeve is vertically embedded in the side of the first precast component, and a pre-drilled circular hole is provided in the middle of the bottom of the anti-slip sleeve, extending downwards through the bottom of the first precast component. A threaded sleeve is pre-embedded on the butt joint side of the second precast component, with the threaded sleeve and the pre-drilled circular hole facing each other vertically. A connecting bolt is threaded onto the threaded sleeve. The upper end of the connecting bolt is inserted into the anti-slip sleeve along the reserved round hole. A limiting component is provided on the anti-slip sleeve to restrict the movement of the connecting bolt. The limiting component includes an eccentric nut set in the anti-slip sleeve. A limiting groove is provided on the side of the eccentric nut near the connecting bolt. The upper end of the connecting bolt is stuck in the limiting groove. An inverted T-shaped groove is provided on the other end of the eccentric nut. A limiting recess is provided on the anti-slip sleeve located directly above the inverted T-shaped groove. The limiting recess and the inverted T-shaped groove are connected and a limiting pin is installed together.

2. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 1, characterized in that: A recessed slot is provided on the side of the first prefabricated component. The slot has a rectangular structure and is located directly above the limiting recess. The slot is connected to the limiting recess and the inverted T-shaped groove. A rubber filler block is filled in the slot.

3. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 1, characterized in that: The inverted T-groove includes a horizontal groove with a rectangular cross-section and a vertical groove with a trapezoidal cross-section. The vertical groove is perpendicular to the horizontal groove and they are interconnected. An upper opening connected to the limiting notch is provided at the upper end of the vertical groove.

4. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 3, characterized in that: The cross-sections of the limiting recess and the limiting pin are both trapezoidal. The limiting pin is adapted to the limiting recess and the vertical groove, and the limiting pin is inserted into the limiting recess and the vertical groove.

5. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 3, characterized in that: The eccentric nut has a cylindrical structure. The limiting groove includes a horizontal sliding groove on the eccentric nut. The horizontal sliding groove passes through the other end face of the eccentric nut away from the inverted T-shaped groove along the axial direction. The horizontal sliding groove has a groove opening. The opening direction of the groove opening is consistent with that of the upper opening. A vertical sliding groove is provided on the side of the horizontal sliding groove near the inverted T-shaped groove. The vertical sliding groove passes through the eccentric nut radially up and down. The vertical sliding groove and the vertical groove are spaced apart from each other and parallel to each other. The vertical sliding groove and the horizontal sliding groove are connected. A positioning groove is provided on the side of the vertical sliding groove near the horizontal sliding groove.

6. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 5, characterized in that: The connecting bolt includes a screw rod placed in a vertical groove, and a nut placed in a positioning groove is fixedly connected to the upper end of the screw rod. The height of the positioning groove is consistent with the thickness of the nut.

7. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 1, characterized in that: A connecting steel bar is provided inside the first precast component, and the other end of the anti-slip sleeve away from the inverted T-slot is fixedly connected to the connecting steel bar.

8. The detachable, anti-slip, and anti-detachment dry connection assembly for precast components according to claim 1, characterized in that: The upper end face of the threaded sleeve is flush with the end face of the second prefabricated component.

Images