Reinforcing bar connecting device for precast concrete structure and construction method thereof

Abstract

The application relates to the field of building connecting structures, and discloses a reinforcing steel bar connecting device for a prefabricated concrete structure and a construction method thereof. The device comprises a sleeve, a sliding rod, a friction sleeve, a compression ring, a sealing nut, a self-resetting assembly and a quick-release assembly. The self-resetting assembly comprises a disc spring assembly and an energy storage nut, and the quick-release assembly comprises a switch bin and a bolt. A limiting block is arranged on the inner wall of the sleeve. The friction sleeve adopts a composite structure and comprises an elastic matrix and a friction working layer arranged on the inner wall of the elastic matrix. The thread pair between the compression ring and the sleeve is a trapezoidal thread. The construction method comprises the following steps: embedding the sleeve and the sliding rod into a concrete member; adjusting the position; aligning the connection; setting the friction force; resetting and pre-tightening; and completing the connection. The device integrates friction energy dissipation and post-earthquake self-resetting, the friction force is accurately adjustable, and the core components are easy to disassemble, maintain and replace, so that the seismic performance of the prefabricated concrete joint is improved, and the construction convenience is improved.

Description

Technical Field

[0001] This invention relates to the field of building connection structure technology, specifically to a steel reinforcement connection device for precast concrete structures and its construction method. Background Technology

[0002] In precast concrete structures, longitudinal reinforcement connections between adjacent members typically employ grouted sleeves, threaded sleeves, or other rigid connection methods. These methods meet general force transmission requirements and are therefore widely used in precast concrete structures. However, under seismic loading or repeated loading, existing connection methods, primarily rigid or conventional, focus mainly on force transmission at the connection points, with less consideration given to displacement recovery after stress and energy dissipation regulation at the connection points.

[0003] While existing technologies offer connection or node structures that utilize disc springs to provide restoring force and friction pairs to dissipate energy, these structures primarily focus on the functional implementation of nodes, supports, or joint bodies. When applied to rebar connections in precast concrete structures, several practical problems remain. First, the integration between the friction energy-dissipating structure and the rebar connection structure is not compact enough. In some designs, the friction components are scattered, resulting in long adjustment paths and hindering stable friction adjustment within the limited sleeve space. Second, friction components may wear down over time, and existing friction-related components are often difficult to disassemble and reassemble, requiring complete disassembly for maintenance, impacting subsequent repairs and replacements. Furthermore, in precast concrete rebar connection scenarios, the structures must also consider application requirements such as connection force transmission, spatial arrangement, and on-site assembly.

[0004] Therefore, for the steel reinforcement connection parts of precast concrete structures, it is still necessary to provide a steel reinforcement connection device with a more compact structure, easy adjustment of friction force, and easy disassembly and maintenance of energy-consuming components, so as to meet the connection, adjustment and subsequent maintenance needs of precast concrete structure connection parts in a limited space. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rebar connection device for precast concrete structures and its construction method, which solves the problems of inconvenient adjustment of friction and inconvenient disassembly and maintenance of energy-consuming components in existing rebar connection devices for precast concrete structures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a steel reinforcement connection device for precast concrete structures, comprising: The sleeve, as the carrier of the overall device, is used to protect the internal structure; The slide bar slides inside the sleeve and is used to connect the two force-bearing parts. When force is applied, it moves relative to the sleeve, causing friction to dissipate energy and the disc spring to reset. The friction sleeve is installed on the outer wall of the slide rod and is used to generate frictional contact with the slide rod and dissipate energy during the relative displacement of the slide rod. The clamping ring, with its threads inside the sleeve, is used to apply clamping force to the friction sleeve, so that the friction sleeve grips the slide rod and forms adjustable frictional resistance. A sealing nut, with its threads inside the sleeve, is used to seal and protect the inside of the sleeve. The self-resetting assembly, installed inside the sleeve, provides a restoring force after the device joint is displaced by force and drives the slide bar to move back, so that the device joint can return to its initial position or near its initial position after unloading. The quick-release assembly, located on the outer wall of the sleeve, is used to control the clamping ring to adjust the friction force of the friction sleeve against the slide rod, and to facilitate the replacement of the friction sleeve.

[0007] Preferably, the self-resetting assembly includes a disc spring assembly and an energy storage nut, the disc spring assembly being sleeved on the outer periphery of the slide rod, and the energy storage nut being threadedly connected inside the sleeve.

[0008] Preferably, one end of the disc spring assembly abuts against the bottom side of the friction sleeve, and the other end abuts against the top of the sealing nut, and the energy storage nut applies an axial preload to the disc spring assembly through the sealing nut.

[0009] Preferably, the friction sleeve is configured as an open ring structure, the outer wall of the friction sleeve is provided with an outer conical surface, and the inner wall of the clamping ring is provided with an inner conical surface that mates with the outer conical surface. This is used to regulate the friction force on the slide rod by squeezing the opening of the friction sleeve through the corresponding outer conical surface and the inner conical surface when the clamping ring moves along the thread.

[0010] Preferably, the quick-release assembly includes a switch compartment and a bolt, the switch compartment being disposed on the outer wall of the sleeve, and the bolt passing through the inside of the sleeve and threadedly connected to the switch compartment.

[0011] Preferably, the friction sleeve is divided into two symmetrically distributed parts. A mating block is installed on the side of one friction sleeve close to the other friction sleeve. The mating block is inserted into the other friction sleeve and fixed by a spring pin inside the mating block.

[0012] Preferably, a limiting block is installed on the inner wall of the sleeve. The limiting block limits the sliding rod when it slides within a certain range, preventing further sliding.

[0013] Preferably, the friction sleeve adopts a composite structure, including an elastic matrix and a friction working layer disposed on the inner wall of the elastic matrix; Preferably, the threaded pair between the clamping ring and the sleeve is a trapezoidal thread, the pitch of the trapezoidal thread is 1.5mm to 3.0mm, and the semi-cone angle of the outer conical surface of the friction sleeve relative to the sleeve axis is 7° to 9°.

[0014] A construction method for a steel reinforcement connection device in a precast concrete structure includes the following steps: During the fabrication of the lower precast concrete component, the sleeve is pre-embedded in the lower precast concrete component, and one end of the sliding rod is connected to the reinforcing steel in the lower precast concrete component. The upper precast concrete component is hoisted above the lower precast concrete component, and the reinforcing bars inside the upper precast concrete component are aligned with the other end of the slide bar. Adjust the positions of the upper and lower precast concrete components so that the other end of the slide rod is connected to the reinforcing steel in the upper precast concrete component; The quick-release assembly drives the clamping ring to move along the internal thread of the sleeve, so that the clamping ring and the friction sleeve are engaged. The disc spring assembly is axially preloaded using the energy storage nut and the sealing nut; Complete the steel reinforcement connection construction between the upper precast concrete components and the lower precast concrete components.

[0015] This invention provides a steel reinforcement connection device for precast concrete structures and its construction method. It has the following beneficial effects: 1. This invention utilizes the engagement of a clamping ring with the internal thread of the sleeve, and applies axial compressive force to the friction sleeve using the clamping ring. This causes the friction sleeve to form an adjustable radial clamping effect on the slide rod, achieving continuous adjustment of friction resistance within the limited space of the sleeve. It also improves the compactness and stability of friction adjustment, solving the technical problems of insufficient compactness of the existing friction energy dissipation structure and steel reinforcement connection structure, dispersed arrangement of friction components, and long adjustment path, which makes it inconvenient to stably achieve friction force adjustment within the limited sleeve space.

[0016] 2. This invention achieves adjustable frictional resistance while retaining the reset capability of the connection part by adjusting the frictional force and cooperating with the reset structure formed by the disc spring assembly, energy storage nut and sealing nut. This solves the technical problem that the friction adjustment method and the connection reset structure are not tightly integrated in existing related structures, which is not conducive to engineering applications.

[0017] 3. The present invention, through the cooperation of quick-release components, separately set friction sleeves and docking blocks, enables the clamping ring to retract and the friction sleeve to be removed from the outer wall of the slide rod and reinstalled. This achieves the effect of partial disassembly and maintenance and reuse of friction energy-consuming components, solving the problem that it is inconvenient to replace existing energy-consuming components after wear and easy to involve overall disassembly during maintenance. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the sleeve of the present invention; Figure 3 This is an exploded view of the structure of the present invention; Figure 4 This is a schematic diagram of the friction sleeve connection of the present invention; Figure 5 This is a flowchart of the construction method steps of the present invention.

[0019] The components are: 1. Sleeve; 2. Slide rod; 3. Pressure ring; 4. Friction sleeve; 5. Disc spring assembly; 6. Sealing nut; 7. Energy storage nut; 8. Switch compartment; 9. Bolt; 10. Limiting block; 11. Connecting block. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a steel reinforcement connection device for precast concrete structures, comprising: Sleeve 1 serves as the carrier of the overall device and is used to protect the internal structure; The slide bar 2 slides inside the sleeve 1 and is used to connect the two force-bearing parts and to move relative to the sleeve 1 when force is applied, thereby driving friction energy dissipation and disc spring reset. Friction sleeve 4 is installed on the outer wall of slide rod 2 and is used to make frictional contact with slide rod 2 and dissipate energy during the relative displacement of slide rod 2. The clamping ring 3, with its thread inside the sleeve 1, is used to apply clamping force to the friction sleeve 4, so that the friction sleeve 4 grips the slide rod 2 and forms an adjustable frictional resistance. The sealing nut 6 has its threads inside the sleeve 1 and is used to seal and protect the inside of the sleeve 1. The self-resetting component is installed inside the sleeve 1 to provide a restoring force after the device joint is displaced by force and to drive the slide bar 2 to move back, so that the device joint can return to the initial position or close to the initial position after unloading. The quick-release assembly is located on the outer wall of the sleeve 1 and is used to control the clamping ring 3 to adjust the friction force of the friction sleeve 4 on the slide rod 2 and to facilitate the replacement of the friction sleeve 4. The self-resetting assembly includes a disc spring assembly 5 and an energy storage nut 7. The disc spring assembly 5 is sleeved on the outer periphery of the slide bar 2, and the energy storage nut 7 is threaded into the inside of the sleeve 1. One end of the disc spring assembly 5 abuts against the bottom side of the friction sleeve 4, and the other end abuts against the top of the sealing nut 6. The energy storage nut 7 applies axial preload to the disc spring assembly 5 through the sealing nut 6. The friction sleeve 4 is configured as an open ring structure. The outer wall of the friction sleeve 4 is provided with an outer conical surface, and the inner wall of the clamping ring 3 is provided with an inner conical surface that mates with the outer conical surface. This is used to adjust the friction force on the slide rod 2 by squeezing the friction sleeve 4 through the corresponding outer conical surface and inner conical surface when the clamping ring 3 moves along the thread. The friction sleeve 4 adopts a composite structure, including an elastic matrix and a friction working layer disposed on the inner wall of the elastic matrix. The elastic matrix is ​​made of spring steel, and the friction working layer is fixed to the inner wall of the elastic matrix. The threaded pair between the clamping ring 3 and the sleeve 1 is a trapezoidal thread with a pitch of 1.5mm to 3.0mm. The semi-cone angle of the outer conical surface of the friction sleeve 4 relative to the axis of the sleeve 1 is 7° to 9°.

[0022] Specifically, when adjusting the friction force between the friction sleeve 4 and the slide rod 2, the clamping ring 3 needs to be threaded into the inner wall of the sleeve 1, allowing it to move axially along the sleeve 1. Considering that the clamping ring 3 needs to withstand axial clamping loads during repeated adjustments, the threaded pair between the clamping ring 3 and the sleeve 1 is preferably a trapezoidal thread. The preferred thread angle of the trapezoidal thread is 30°, the preferred pitch is 1.5mm to 3.0mm, and the preferred thread diameter is 28mm to 45mm. With this pitch range, the axial displacement corresponding to each revolution of the clamping ring 3 is small, facilitating the graded setting of the friction force between the friction sleeve 4 and the slide rod 2; with this diameter range, the load-bearing capacity and service life of the threaded pair can meet the requirements of repeated adjustments of the connecting device.

[0023] In the above-described technical content, compared with the method of loading the friction component using a distributed external clamping component, this embodiment sets a clamping ring 3 arranged coaxially with the sleeve 1, so that the adjusting component is concentrated inside the sleeve 1 around the slide rod 2. The operator only needs to apply a rotation operation to the clamping ring 3, which converts the rotational displacement into axial propulsion through the thread, and then into radial clamping action of the friction sleeve 4 on the slide rod 2 through the conical surface fit, thereby achieving friction adjustment without increasing the radial outer diameter of the sleeve 1.

[0024] The processing method, chamfering method, and lubrication method of the thread profile can be set by those skilled in the art based on conventional mechanical threaded connections. The specific details are well-known in the field and will not be elaborated here.

[0025] The inner conical surface of the clamping ring 3 and the outer conical surface of the friction sleeve 4 cooperate to compress the friction sleeve 4, increasing the friction between the friction sleeve 4 and the slide rod 2. That is, as the clamping ring 3 rotates axially along the sleeve 1, the inner conical surface of the clamping ring 3 gradually comes into contact with the outer conical surface of the friction sleeve 4, thereby applying an axial compressive force to the friction sleeve 4 and converting this axial compressive force into a radial clamping force on the friction sleeve 4. The axial displacement corresponding to the rotation of the clamping ring 3 can be expressed as: ; In the formula, This refers to the axial displacement of the clamping ring 3 relative to the sleeve 1; For the rotation angle of clamping ring 3; The pitch of the threaded pair between the clamping ring 3 and the sleeve 1.

[0026] When using a conical fit, the radial shrinkage of the friction sleeve 4 can be expressed as: ; In the formula, This represents the radial shrinkage of friction sleeve 4; This refers to the axial displacement of the clamping ring 3 relative to the sleeve 1; The semi-cone angle of the outer conical surface of friction sleeve 4 relative to the axis of sleeve 1.

[0027] Half cone angle The preferred angle is 7° to 9°. If the semi-cone angle is too large, the axial adjustment of the clamping ring 3 is more sensitive to changes in the radial shrinkage of the friction sleeve 4, making fine-tuning difficult; if the semi-cone angle is too small, the mating surface may not retract smoothly when the clamping ring 3 retracts. The axial clamping load generated by the rotation of the clamping ring 3 and the tightening torque can be controlled according to the conventional thread pair relationship, preferably approximated by the following formula: ; In the formula, The axial clamping load generated by the threaded pair of the clamping ring 3; The tightening torque applied to the clamping ring 3; This is the thread torque coefficient; It is the mean diameter of the threaded pair between the clamping ring 3 and the sleeve 1.

[0028] The axial clamping load generated by the clamping ring 3 is transmitted to the friction sleeve 4 via the conical surface. The friction sleeve 4 then applies a normal contact force to the slide rod 2. The frictional resistance between the friction sleeve 4 and the slide rod 2 can be expressed as: ; In the formula, The frictional resistance along the axial direction between the friction sleeve 4 and the slide rod 2; The friction coefficient is the coefficient between the inner wall friction working layer of the friction sleeve 4 and the outer surface of the slide rod 2. The friction sleeve 4 acts on the outer surface of the slide rod 2 as the total normal contact force.

[0029] in, The axial clamping load of the clamping ring 3, the conical surface fit relationship, the structural rigidity of the friction sleeve 4, and the contact state between the friction sleeve 4 and the slide rod 2 are all determined by the clamping load of the clamping ring 3, the conical surface fit relationship, the structural rigidity of the friction sleeve 4, and the contact state between the friction sleeve 4 and the slide rod 2.

[0030] To avoid relying solely on theoretical derivation to determine friction force on-site, it is necessary to calibrate the correspondence between the rotation angle and tightening torque of the clamping ring 3 and the sliding force of the slide rod 2 before leaving the factory, and create a reference table. The outer circumference of the clamping ring 3 can also be equipped with scale marks, positioning grooves, or baselines. During construction, by rotating the clamping ring 3 to the corresponding scale position according to the reference table, the friction force between the friction sleeve 4 and the slide rod 2 can be controlled within a predetermined range.

[0031] Furthermore, the friction sleeve 4 should not be made entirely of pure friction material. The friction sleeve 4 needs to undergo recoverable radial contraction deformation under the action of the clamping ring 3, and also needs to maintain stable frictional performance when in contact with the slide rod 2. Therefore, the friction sleeve 4 can adopt a composite structure, specifically composed of an elastic matrix and a friction working layer. The elastic matrix provides radial contraction capability and overall strength, while the friction working layer is used for direct contact with the slide rod 2 and to generate frictional force.

[0032] The elastic matrix of the friction sleeve 4 is preferably made of spring steel, more preferably 65Mn, 60Si2Mn, 50CrVA, or other elastic steels with equivalent properties. The hardness of the elastic matrix after heat treatment is preferably HRC38 to HRC48. Within this hardness range, the friction sleeve 4 can maintain its resilience during repeated compression and release of the clamping ring 3 and can withstand stress concentration at the gap. The friction working layer of the friction sleeve 4 is disposed on the inner wall of the friction sleeve 4. The friction working layer can be made of non-asbestos organic friction material, copper-based powder metallurgy friction material, resin-based composite friction material, or other commonly used wear-resistant friction materials. The friction working layer can be fixed to the inner wall of the elastic matrix by adhesive bonding, riveting, sintering, or embedding. For conventional fixing methods of the friction working layer, those skilled in the art can select appropriate processes according to the type of friction material; the specific details are well-known in the art and will not be elaborated here.

[0033] When the device is under stress, the sliding rod 2, connected to the steel bars at both ends, undergoes axial displacement relative to the sleeve 1. Relative friction is generated between the sliding rod 2 and the friction sleeve 4, thereby dissipating externally input energy. Since the friction sleeve 4 is located on the outer wall of the sliding rod 2, the friction is distributed along the outer circumference of the sliding rod 2, resulting in a relatively uniform force distribution on the sliding rod 2. As the sliding rod 2 continues to move, the disc spring assembly 5 in the self-resetting assembly is compressed and deformed, storing elastic potential energy. After the external load decreases, the disc spring assembly 5 releases its elastic potential energy, pushing the sliding rod 2 to move in the opposite direction, thus causing the connection part to retract to the installation position. The sealing nut 6 is located inside the sleeve 1, serving to limit and support the internal components and to seal the interior of the sleeve 1, reducing the impact of external impurities on the internal friction and reset components. When the disc spring assembly 5 releases its elastic potential energy, the corresponding energy storage nut 7 rebounds through the connection of the sealing nut 6.

[0034] When it is necessary to adjust the friction force or replace the friction sleeve 4, the quick-release assembly can be used to drive the clamping ring 3 to rotate, causing the clamping ring 3 to move along the internal thread of the sleeve 1. This reduces the squeezing force of the clamping ring 3 on the friction sleeve 4 and also facilitates the replacement of the friction sleeve 4. The transmission connection, locking, and release structure in the quick-release assembly can be configured by those skilled in the art based on conventional disassembly and assembly mechanisms. The specific implementation methods are well-known in the field and will not be elaborated upon here.

[0035] Please see the appendix Figure 1 The quick-release assembly includes a switch compartment 8 and a bolt 9. The switch compartment 8 is located on the outer wall of the sleeve 1, and the bolt 9 passes through the inside of the sleeve 1 and is threaded onto the switch compartment 8.

[0036] Specifically, when adjusting the position of the clamping ring 3, simply remove the bolt 9 with a screwdriver. This allows the switch chamber 8 to be pulled out. With the switch chamber 8 open, the operating part of the clamping ring 3 is exposed outside the sleeve 1. The operator can use a tool to drive the clamping ring 3 to rotate in the loosening direction, causing the clamping ring 3 to axially retract relative to the friction sleeve 4, relieving the squeezing effect on the outer conical surface of the friction sleeve 4. Once the friction sleeve 4 returns to its freely open state, the split friction sleeve 4 can be radially removed from the slide rod 2. After replacement, the new friction sleeve 4 is placed around the slide rod 2, and the clamping ring 3 is retightened to the preset position. This forms a localized maintenance path for the friction-consuming components, eliminating the need to completely remove the sleeve 1 from the component connection.

[0037] Please see the appendix Figure 4 The friction sleeve 4 is divided into two symmetrically distributed parts. A docking block 11 is installed on the side of one friction sleeve 4 close to the other friction sleeve 4. The docking block 11 is inserted into the other friction sleeve 4 and fixed by a spring pin inside the docking block 11.

[0038] Specifically, the friction sleeve 4 is formed by the splicing of two semi-annular components, which are symmetrically arranged around the slide rod 2. After splicing, they form a structural gap extending axially. This structural gap is the slot of the friction sleeve 4, used to reserve deformation space for the radial contraction of the friction sleeve 4 under the action of the clamping ring 3. The width of the opening of the friction sleeve 4 in the un-clamped state is preferably 0.3mm to 1.5mm, the radial thickness of the elastic matrix is ​​preferably 2mm to 5mm, and the axial width of the friction sleeve 4 is preferably 8mm to 20mm. When the slide rod 2 and the friction sleeve 4 are assembled, the inner diameter of the friction sleeve 4 in the free state is preferably slightly larger than the outer diameter of the slide rod 2 by 0.02mm to 0.20mm. After the clamping ring 3 is screwed in, the friction sleeve 4 contracts inward, and the friction working layer forms a surface contact with the outer surface of the slide rod 2. The slide rod 2 is preferably made of tempered steel, and its outer surface can be hardened, chrome-plated, nitrided, or coated with a wear-resistant coating to ensure a stable fit with the friction sleeve 4. The conventional heat treatment and surface strengthening methods for the surface of the slide bar 2 can be set by those skilled in the art based on the conventional friction pair design. The specific details are well-known in the art and will not be elaborated here.

[0039] Furthermore, to facilitate the disassembly of the friction sleeve 4, it is only necessary to rotate one half of the friction sleeve 4 according to the conventionally set spring pin, which will break the fixing state of the spring pin used for fixing the mating block 11 between the two friction sleeves 4. In this way, the two friction sleeves 4 can be removed one by one, which facilitates the subsequent installation and replacement of the new friction sleeve 4. As for the specific principle of the spring pin, those skilled in the art can set it according to the conventional spring pin assembly. Its specific content belongs to the well-known technology in the field and will not be elaborated here.

[0040] Please see the appendix Figure 2 A limit block 10 is installed on the inner wall of the sleeve 1. The limit block 10 limits the slide rod 2 when it slides within a certain range, preventing the sliding from continuing.

[0041] Specifically, in order to prevent the slider 2 from moving to the preset limit value and deforming, the limit block 10 is set to limit its maximum movement distance in the event of a large movement, thus preventing such situations from occurring.

[0042] Please see the appendix Figure 5 A construction method for a steel reinforcement connection device in a precast concrete structure includes the following steps: S1. When the lower precast concrete component is manufactured, the sleeve 1 is pre-embedded in the lower precast concrete component, and one end of the slide rod 2 is connected to the steel bar in the lower precast concrete component. S2. Hoist the upper precast concrete component above the lower precast concrete component, and align the reinforcing bars inside the upper precast concrete component with the other end of the slide bar 2. S3. Adjust the position of the upper precast concrete component and the lower precast concrete component so that the other end of the slide rod 2 is connected to the steel reinforcement in the upper precast concrete component. S4. Drive the clamping ring 3 to move along the internal thread of the sleeve 1 through the quick-release assembly, so that the clamping ring 3 and the friction sleeve 4 are engaged. S5. The disc spring assembly 5 is axially pre-tightened by the energy storage nut 7 and the sealing nut 6; S6. Complete the steel reinforcement connection between the upper precast concrete components and the lower precast concrete components.

[0043] Specifically, the structure involved in the above construction method is the same as the structural principle and technical details disclosed in the aforementioned device, and will not be repeated here.

[0044] Working principle: After the device is installed at the connection point of adjacent precast concrete components, the energy storage nut 7 normally applies axial preload to the disc spring assembly 5 through the sealing nut 6, putting the device in its initial operating state. Then, when relative displacement occurs between the concrete components due to external forces, the sliding rod 2 and sleeve 1 begin to move relative to each other. Simultaneously, during the movement of the sliding rod 2, relative friction occurs between it and the friction sleeve 4, and the sliding rod 2 begins to compress the disc spring assembly 5, causing the disc spring assembly 5 to store elastic potential energy. At this time, the sealing nut 6 supports the disc spring assembly 5 and can store the energy. The preload of nut 7 is transmitted to disc spring assembly 5. After the external force between the concrete components is eliminated, disc spring assembly 5 releases the elastic potential energy stored during compression, causing slide rod 2 and sleeve 1 to move back until the initial working state is restored. Before operation, we can adjust the clamping ring 3 by disassembling bolt 9 to open switch chamber 8, thereby controlling its compression of friction sleeve 4 and thus controlling the friction between friction sleeve 4 and slide rod 2. When friction sleeve 4 needs to be replaced, the two friction sleeves 4 can be quickly removed by using the spring pin of docking block 11, and a new friction sleeve 4 can be quickly replaced.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel reinforcement connection device for precast concrete structures, characterized in that, include: The sleeve (1) serves as the carrier of the overall device and is used to protect the internal structure; The slide bar (2) slides inside the sleeve (1) and is used to connect the two force-bearing parts and to move relative to the sleeve (1) when force is applied, thereby driving friction to dissipate energy and the disc spring to reset. Friction sleeve (4) is installed on the outer wall of slide rod (2) and is used to make frictional contact with slide rod (2) and dissipate energy during the relative displacement of slide rod (2); The clamping ring (3), whose thread is inside the sleeve (1), is used to apply clamping force to the friction sleeve (4), so that the friction sleeve (4) grips the slide rod (2) and forms an adjustable frictional resistance; The sealing nut (6) has its threads inside the sleeve (1) and is used to seal and protect the inside of the sleeve (1); The self-resetting assembly is installed inside the sleeve (1) to provide restoring force after the device joint is displaced by force and to drive the slide bar (2) to move back so that the device joint can return to the initial position or close to the initial position after unloading. The quick-release assembly is located on the outer wall of the sleeve (1) and is used to control the clamping ring (3) to adjust the friction force of the friction sleeve (4) on the slide rod (2) and to facilitate the replacement of the friction sleeve (4).

2. The steel reinforcement connection device for precast concrete structures according to claim 1, characterized in that, The self-resetting assembly includes a disc spring assembly (5) and an energy storage nut (7). The disc spring assembly (5) is sleeved on the outer periphery of the slide rod (2), and the energy storage nut (7) is threaded inside the sleeve (1).

3. The steel reinforcement connection device for precast concrete structures according to claim 2, characterized in that, One end of the disc spring assembly (5) abuts against the bottom side of the friction sleeve (4), and the other end abuts against the top of the sealing nut (6). The energy storage nut (7) applies an axial preload to the disc spring assembly (5) through the sealing nut (6).

4. The steel reinforcement connection device for precast concrete structures according to claim 1, characterized in that, The friction sleeve (4) is configured as an open ring structure. The outer wall of the friction sleeve (4) is provided with an outer conical surface, and the inner wall of the clamping ring (3) is provided with an inner conical surface that cooperates with the outer conical surface. This is used to regulate the friction force on the slide rod (2) by squeezing the friction sleeve (4) through the corresponding outer conical surface and the inner conical surface when the clamping ring (3) moves along the thread.

5. A steel reinforcement connection device for precast concrete structures according to claim 1, characterized in that, The quick-release assembly includes a switch compartment (8) and a bolt (9). The switch compartment (8) is disposed on the outer wall of the sleeve (1), and the bolt (9) passes through the inside of the sleeve (1) and is threaded onto the switch compartment (8).

6. A steel reinforcement connection device for a precast concrete structure according to claim 1, characterized in that, The friction sleeve (4) is divided into two symmetrically distributed parts. A docking block (11) is installed on one side of the friction sleeve (4) close to the other friction sleeve (4). The docking block (11) is inserted into the other friction sleeve (4) and fixed by a spring pin inside the docking block (11).

7. A steel reinforcement connection device for a precast concrete structure according to claim 1, characterized in that, The inner wall of the sleeve (1) is fitted with a limiting block (10). The limiting block (10) limits the sliding rod (2) when the sliding rod (2) slides within a certain range, preventing the sliding from continuing.

8. A steel reinforcement connection device for a precast concrete structure according to claim 1, characterized in that, The friction sleeve (4) adopts a composite structure, including an elastic matrix and a friction working layer disposed on the inner wall of the elastic matrix.

9. A steel reinforcement connection device for a precast concrete structure according to claim 1, characterized in that, The threaded pair between the clamping ring (3) and the sleeve (1) is a trapezoidal thread with a pitch of 1.5mm to 3.0mm and a semi-cone angle of the outer conical surface of the friction sleeve (4) relative to the axis of the sleeve (1) of 7° to 9°.

10. A construction method for a steel reinforcement connection device for a precast concrete structure, applied to the steel reinforcement connection device for a precast concrete structure as described in any one of claims 1-9, characterized in that, Includes the following steps: When the lower precast concrete component is made, the sleeve (1) is embedded in the lower precast concrete component and one end of the slide rod (2) is connected to the steel bar in the lower precast concrete component. The upper precast concrete component is hoisted above the lower precast concrete component, and the steel bars in the upper precast concrete component are aligned with the other end of the slide bar (2); Adjust the positions of the upper precast concrete component and the lower precast concrete component so that the other end of the slide rod (2) is connected to the steel reinforcement in the upper precast concrete component; The quick-release assembly drives the clamping ring (3) to move along the internal thread of the sleeve (1), so that the clamping ring (3) and the friction sleeve (4) are engaged. The disc spring assembly (5) is axially preloaded by the energy storage nut (7) and the sealing nut (6); Complete the steel reinforcement connection construction between the upper precast concrete components and the lower precast concrete components.

Images