An assembled concrete frame joint with built-in pull rod sleeve damper

Abstract

This invention relates to the field of building engineering technology and proposes a prefabricated concrete frame joint with a built-in tie rod sleeve damper. The joint includes precast concrete frame columns, precast concrete frame beams, unbonded prestressed steel strands, a built-in tie rod sleeve damper, and precision-rolled threaded steel bars. The precast concrete frame columns are arranged vertically, with precast concrete frame beams symmetrically arranged on both sides. The connection point between the precast concrete frame columns and the precast concrete frame beams is a connecting section. The unbonded prestressed steel strands pass through the middle of the connecting section, and both ends of the unbonded prestressed steel strands extend into the precast concrete frame beams. A built-in tie rod sleeve damper is installed at the connecting section. This invention can significantly improve the seismic strength and crack resistance of buildings under earthquake loads without affecting the normal use of the building structure or changing the building's external structure, thus improving the overall seismic performance of prefabricated structures.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology and proposes a prefabricated concrete frame joint with a built-in tie rod sleeve damper. Background Technology

[0002] Currently, the development of green building has become an important benchmark in the construction industry. New buildings must have less environmental pollution and better sustainability. Existing concrete frame joint connection methods are mainly wet connections and dry connections. "Wet connections" involve fixing components together through secondary casting during construction. However, secondary casting results in limited working space at the joint, hindering stirrup binding and concrete pouring, thus affecting construction efficiency. Prefabricated concrete joints use a "dry connection" method, eliminating the need for secondary casting and avoiding the disadvantages of wet connections. This method also meets structural requirements and is one of the key research directions in the modern construction industry. Compared to cast-in-place concrete structures, prefabricated concrete structures are more environmentally friendly in terms of construction technology, better conserving water and energy. Furthermore, they reduce noise and dust pollution at construction sites. Prefabricated concrete structures mainly utilize precast components assembled into the main load-bearing structure, significantly reducing site disturbance and saving energy.

[0003] The main structural components of a prefabricated frame structure system include precast columns, precast beams, and precast floor slabs. The connection methods of these columns, beams, and slabs are the fundamental difference between prefabricated structures and cast-in-place concrete structures. Their forms determine the classification of prefabricated structures, and their performance directly determines the overall performance of the structure. Among these, beam-column joints occupy a crucial position in the frame structure system.

[0004] In existing prefabricated concrete structures, grouting sleeves are generally used for beam-column connections. Grouting sleeves require cast-in-place concrete during construction, which is a complex process. The joints have poor energy dissipation capacity, and the grouting points are prone to brittle failure under seismic loads. Post-earthquake repair is also difficult, and severe cracks or even damage may occur at the beam-column connection joints. Another common practice is to press-fit beam-column joints. This method uses prestressed steel strands running through the precast columns and beams to press the beam-column joints together, avoiding concrete pouring. However, using prestressed steel strands alone will also lose their load-bearing capacity during structural deformation, seriously affecting the overall load-bearing capacity of the components. Under seismic loads, the lateral displacement generated at the intersection of prefabricated joints is always the main cause of structural failure. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated concrete frame joint with a built-in tie rod sleeve damper to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An assembled concrete frame joint with a built-in tie rod sleeve damper includes a precast concrete frame column, a precast concrete frame beam, unbonded prestressed steel strands, a built-in tie rod sleeve damper, and finely rolled threaded steel bars. The precast concrete frame column is arranged vertically, with precast concrete frame beams symmetrically arranged on both sides. The connection point between the precast concrete frame column and the precast concrete frame beam is a connection section. The unbonded prestressed steel strand passes through the middle of the connection section, and both ends of the unbonded prestressed steel strand extend into the precast concrete frame beam. A plurality of built-in tie rod sleeve dampers are provided at the connection section, located on the upper and lower sides of the unbonded prestressed steel strand. The two ends of the built-in tie rod sleeve dampers are connected to the finely rolled threaded steel bars inside the precast concrete frame beam. After the precast concrete frame column and the precast concrete frame beam are connected, the joint is filled with high-ductility mortar.

[0008] Furthermore, the built-in tie rod sleeve damper includes a damping tie rod, a steel sleeve, an elastic pad, and a connector. The damping tie rod passes through the inside of the steel sleeve and extends to the outside of the steel sleeve at both ends. The elastic pad is disposed between the damping tie rod and the steel sleeve. An elastic element is disposed between the elastic pad and the damping tie rod. The steel sleeve is detachably fitted with caps at both ends. The end of the damping tie rod is connected to a precision-rolled threaded steel bar through a connector.

[0009] Furthermore, the elastic element is made of metal rubber, and a piston plate is fixed on the damping rod, with metal rubber filling both sides of the piston plate.

[0010] Furthermore, a first prestressed steel strand duct is provided through the connection section of the precast concrete frame column, and a second prestressed steel strand duct is provided through the precast concrete frame beam. The first and second prestressed steel strand ducts correspond one-to-one. Metal corrugated pipes are pre-embedded in both the first and second prestressed steel strand ducts. The metal corrugated pipes in the first and second prestressed steel strand ducts are connected to each other. The unbonded prestressed steel strands are threaded through the metal corrugated pipes.

[0011] Furthermore, the precast concrete frame column has a through-hole for the built-in tie rod sleeve, and there are multiple built-in tie rod sleeves, which are arranged parallel to each other on the upper and lower sides of the first prestressed steel strand channel. The precast concrete frame beam has a through-hole for the fine-rolled threaded steel bar corresponding to the built-in tie rod sleeve. The steel sleeve of the built-in tie rod sleeve damper is embedded in the built-in tie rod sleeve channel, and the fine-rolled threaded steel bar is embedded in the fine-rolled threaded steel bar channel.

[0012] Furthermore, the connector includes a threaded end, a fixing sleeve, and a locking sleeve. The threaded end is provided with internal and external threads, the fixing sleeve is provided with internal threads, the locking sleeve is provided with internal and external threads, and the end of the fine-rolled threaded steel bar near the precast concrete frame column is provided with threads.

[0013] Furthermore, the threaded end of the precision-rolled threaded steel bar is connected to the internal thread of the threaded end, the external thread of the threaded end is engaged with the internal thread of the fixed sleeve, the external thread of the locking sleeve is engaged with the internal thread of the fixed sleeve, and the two ends of the damping rod are respectively provided with external threads, the external threads of the damping rod are engaged with the internal threads of the locking sleeve.

[0014] Furthermore, the steel sleeve includes a cylinder body with internal threads at both ends and an external thread on the cover body. The two ends of the cylinder body are threadedly connected to the cover body, and a protrusion is provided on the side of the cover body away from the cylinder body.

[0015] Furthermore, the two ends of the elastic pad are respectively in contact with the caps at both ends of the cylinder, and the metal rubber on both sides of the piston plate is in contact with the two caps respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention provides a prefabricated concrete frame joint with a built-in tie rod sleeve damper. The built-in tie rod sleeve damper is located at a reserved position on the prefabricated component, which can provide a certain degree of horizontal movement for the prefabricated concrete frame beam. This can greatly improve the seismic strength and crack resistance of the building under earthquake action without affecting the normal use of the building structure or changing the building's external structure, thereby improving the overall seismic performance of the prefabricated structure. The reserved duct for threading unbonded prestressed steel strands helps to improve the self-recovery ability of the joint, resulting in less deformation after an earthquake.

[0018] 2. The present invention provides a prefabricated concrete frame node with a built-in tie rod sleeve damper. The node is composed of prefabricated components. The precast concrete frame beams and precast concrete frame columns can be manufactured and transported to the site for assembly. The size and quality of the components can be well guaranteed, which greatly facilitates the on-site construction.

[0019] 3. The present invention provides an assembled concrete frame joint with a built-in tie rod sleeve damper. The elastic element has the function of absorbing energy in both the horizontal and vertical directions, which can provide the joint with a certain degree of freedom in the horizontal and vertical directions, thus forming a flexible joint. Under seismic action, it can increase the flexibility of the joint, reduce the degree of cracking of the structure, greatly reduce the horizontal displacement at the joint, and improve the energy dissipation effect.

[0020] 4. The present invention provides a prefabricated concrete frame joint with a built-in tie rod sleeve damper. This frame joint with the built-in sleeve damper provides higher joint strength, significantly enhancing the load-bearing capacity at the joint. Furthermore, the steel sleeve provides the ability to recover its original shape after earthquakes, improving various performance indicators at the joint.

[0021] 5. The present invention provides an assembled concrete frame joint with a built-in tie rod sleeve damper. This structure is suitable for the finely threaded steel bars at beam-column joints, does not occupy additional installation space, and can be installed before the precast concrete frame columns and precast concrete frame beams are assembled. The precast beams and columns and the assembled installation method simplify the construction process. After the steel sleeve is pre-installed, an appropriate amount of high-ductility mortar is poured into the nut connection at both ends of the sleeve to make the precast concrete frame columns and precast concrete frame beams form a whole, which can enhance the strength of the joint, reduce the damage to the joint during earthquakes, play an energy dissipation role during earthquakes, allow the beams and columns to undergo a certain angular displacement, and prevent the beam-column structure at the joint from being damaged by excessive deformation. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of an assembled concrete frame node with a built-in tie rod sleeve damper according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of the built-in tie rod sleeve damper according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the exploded state of the built-in tie rod sleeve damper according to an embodiment of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of point M.

[0026] In the diagram: 1. Precast concrete frame column; 2. Precast concrete frame beam; 3. Unbonded prestressed steel strand; 4. Built-in tie rod sleeve damper; 5. Fine-rolled threaded steel bar; 10. Connecting section; 11. First prestressed steel strand duct; 12. Built-in tie rod sleeve duct; 21. Second prestressed steel strand duct; 22. Fine-rolled threaded steel bar duct; 41. Damping tie rod; 42. Steel sleeve; 43. Elastic pad; 44. Metal rubber; 46. Connector; 45. Piston plate; 421. Cylinder; 422. Cover; 461. Thread; 462. Fixing sleeve; 463. Locking sleeve. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" simply indicates a connection between devices and has no special meaning.

[0029] Furthermore, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Please refer to the specific embodiments. Figures 1-4 An assembled concrete frame joint with a built-in tie rod sleeve damper includes a precast concrete frame column 1, a precast concrete frame beam 2, an unbonded prestressed steel strand 3, a built-in tie rod sleeve damper 4, and a finely rolled threaded steel bar 5. The precast concrete frame column 1 is arranged vertically, and precast concrete frame beams 2 are symmetrically arranged on both sides. The connection between the precast concrete frame column 1 and the precast concrete frame beam 2 is a connection section 10. The unbonded prestressed steel strand 3 passes through the middle of the connection section 10, and the two ends of the unbonded prestressed steel strand 3 extend into the precast concrete frame beam 2. A plurality of built-in tie rod sleeve dampers 4 are provided at the connection section 10, located on the upper and lower sides of the unbonded prestressed steel strand 3 respectively. The two ends of the built-in tie rod sleeve damper 4 are connected to the finely rolled threaded steel bar 5 inside the precast concrete frame beam 2. After the precast concrete frame column 1 and the precast concrete frame beam 2 are connected, the joint is filled with high ductility mortar.

[0031] The built-in tie rod sleeve damper 4 includes a damping tie rod 41, a steel sleeve 42, an elastic pad 43, and a connector 46. The damping tie rod 41 passes through the inside of the steel sleeve 42 and extends to the outside of the steel sleeve 42 at both ends. The elastic pad 43 is disposed between the damping tie rod 41 and the steel sleeve 42. An elastic element is disposed between the elastic pad 43 and the damping tie rod 41. The steel sleeve 42 is detachably provided with caps 422 at both ends. The end of the damping tie rod 41 is connected to the finely rolled threaded steel bar 5 through the connector 46.

[0032] The elastic element is made of metal rubber 44, and a piston plate 45 is fixed on the damping rod 41. Both sides of the piston plate 45 are filled with metal rubber 44.

[0033] A first prestressed steel strand duct 11 is provided through the connecting section 10 of the precast concrete frame column 1, and a second prestressed steel strand duct 21 is provided through the precast concrete frame beam 2. The first prestressed steel strand duct 11 and the second prestressed steel strand duct 21 correspond one-to-one. Metal corrugated pipes are pre-embedded in both the first prestressed steel strand duct 11 and the second prestressed steel strand duct 21. The metal corrugated pipe in the first prestressed steel strand duct 11 is connected to the metal corrugated pipe in the second prestressed steel strand duct 21. The unbonded prestressed steel strand 3 is passed through the metal corrugated pipe.

[0034] A through-hole 12 for the built-in tie rod sleeve is provided at the connecting section 10 of the precast concrete frame column 1. Multiple through-hole 12 for the built-in tie rod sleeve are provided, which are arranged parallel to the upper and lower sides of the first prestressed steel strand through-hole 11. A through-hole 22 for the fine-rolled threaded steel bar corresponding to the through-hole 12 for the built-in tie rod sleeve is provided in the precast concrete frame beam 2. The steel sleeve 42 of the built-in tie rod sleeve damper 4 is embedded in the through-hole 12 for the built-in tie rod sleeve, and the fine-rolled threaded steel bar 5 is embedded in the fine-rolled threaded steel bar through-hole 22.

[0035] The steel sleeve 42 includes a cylindrical body 421 with internal threads at both ends and an external thread on a cover 422. The two ends of the cylindrical body 421 are threaded to the cover 422. An annular protrusion is provided on the side of the cover 422 away from the cylindrical body 421. The protrusion helps to assist in the installation of the cover 422. The two ends of the elastic pad 43 abut against the covers 422 at both ends of the cylindrical body 421. The metal rubber 44 on both sides of the piston plate 45 abuts against the two covers 422 respectively. The two covers 422 can be threadedly adjusted relative to the cylindrical body 421 to adjust the installation position of the cover 422 and adjust the abutment force between the cover 422 and the metal rubber 44 and the elastic pad 43 to adjust the flexibility of the built-in tie rod sleeve damper 4 and assist in adjusting the installation position of the connector 46.

[0036] The connector 46 includes a threaded end 461, a fixing sleeve 462, and a locking sleeve 463. The threaded end 461 is provided with internal and external threads, the fixing sleeve 462 is provided with internal threads, and the locking sleeve 463 is provided with internal and external threads. The end of the fine-rolled threaded steel bar 5 near the precast concrete frame column 1 is provided with threads. The threaded end of the fine-rolled threaded steel bar 5 mates with the internal thread of the threaded end 461. The external thread of the threaded end 461 mates with the internal thread of the fixing sleeve 462. The external thread of the locking sleeve 463 mates with the internal thread of the fixing sleeve 462. The two ends of the damping rod 41 are respectively provided with external threads. The external thread of the damping rod 41 mates with the internal thread of the locking sleeve 463.

[0037] One end of the outer diameter of the threaded end 461 is also provided with an equilateral hexagonal shaft extension end 1, the outer circle diameter of the equilateral hexagonal shaft extension end 1 is smaller than the outer diameter of the threaded end 461; one end of the outer diameter of the locking sleeve 463 is provided with an equilateral hexagonal shaft extension end 2, the outer circle diameter of the equilateral hexagonal shaft extension end 2 is larger than the outer diameter of the locking sleeve 463.

[0038] The structural configuration of the connector 46 allows for adjustment of the installation positions of the finely rolled threaded steel bar 5 and the damping rod 41 relative to the connector 46, thereby cooperating with the prestress adjustment of the unbonded prestressed steel strand 3.

[0039] Multiple fine-rolled threaded steel bars 5 are provided, and each fine-rolled threaded steel bar 5 corresponds one-to-one with multiple built-in tie rod sleeve dampers 4. The steel sleeve 42 has an installation radius R of 15mm-100mm and a length of 300mm-1100mm. The unbonded prestressed steel strand 3 has a specification of 9-7Φ5 or 12-7Φ5. The connector 46 is made of steel of 45# steel, 40bor steel and other steel types.

[0040] Preferably, anchor plates, trumpet tubes, and outer spiral reinforcements are pre-embedded at both the tensioning end and the anchoring end of the precast concrete frame beam 2. The purpose is to prevent local bearing failure of the anchoring end of the unbonded prestressed steel strand 3. Positioning tubes of the same hole size are inserted at the corresponding positions of the precast concrete frame beam 2 where the installation connectors 46 are arranged. These are the reserved installation holes. The first prestressed steel strand duct 11 and the second prestressed steel strand duct 21 do not require grouting. The unbonded prestressed steel strand 3 is unbonded along its entire length.

[0041] The working principle of this device is as follows: During use, the precast concrete frame columns 1 and precast concrete frame beams 2 are directly transported to the site for dry assembly. Figure 1As shown, precast concrete frame columns 1 and precast concrete frame beams 2 are placed horizontally on the ground, corresponding to the first prestressed steel strand duct 11 of the precast concrete frame column 1 and the second prestressed steel strand duct 21 of the precast concrete frame beam 2. Corrugated metal pipes are sequentially inserted into the first prestressed steel strand duct 11 and the second prestressed steel strand duct 21. Then, unbonded prestressed steel strands 3 are inserted into the corrugated metal pipes, forming a flexible self-resetting structure under overall stress. A cylinder 421 is pre-embedded in the precast concrete frame column 1. An elastic pad 43 is installed inside a steel sleeve 42. Then, a damping rod 41 and a piston plate 45 are installed inside the elastic pad 43. Metal rubber is filled on both sides of the piston plate 45. 44. Seal the built-in tie rod sleeve damper 4 with the cover 422, screw the locking sleeve 463 on both ends of the damping tie rod 41, screw the thread 461 on the corresponding end of the fine-rolled threaded steel bar 5, screw the fixing sleeve 462 on the thread 461, and use the fixing sleeve 462 to tighten the thread 461 on the fine-rolled threaded steel bar 5 and the locking sleeve 463 on the damping tie rod 41. The tightening force is half of the design prestress. Apply about 8mm thick high-toughness fiber high-ductility mortar to the beam-column contact surface to fill the joint. When the strength of the high-toughness fiber mortar at the joint reaches the design value, tension the unbonded prestressed steel strand 3 and anchor it with anchors. Finally, tighten the fixing sleeve 462 to the design prestress.

[0042] The unbonded prestressed steel strand 3 is tensioned one strand at a time in stages. Pressure sensors are installed at the anchorage end of the unbonded prestressed steel strand 3 to monitor the change of the resultant force of the prestressed steel strand during the tensioning process and the experiment. During the tensioning process, the sensors are connected to the TDS303 static data acquisition instrument to monitor the tension stress in real time.

[0043] The built-in tie rod sleeve damper of this invention can be placed in a reserved position inside the frame node without affecting the appearance of the building structure. The installation of the built-in tie rod sleeve damper can be completed before the assembly of the precast concrete frame beams and columns. Installing the built-in tie rod sleeve damper at the beam-column node improves the seismic performance of the precast concrete frame node, enhances the strength of the beam-column node, and greatly avoids the adverse effects of insufficient structural dimensions and poor construction quality. The precast concrete frame beams and columns can be directly transported to the site for dry assembly, ensuring precise dimensions and quality. On-site construction does not need to consider the influence of concrete age. Unbonded prestressed steel strands are threaded through reserved holes, making the precast beams and columns a whole, with reasonable stress distribution and high node self-recovery ability under seismic loads. The built-in tie rod sleeve damper is connected to the precast concrete frame beams and columns through connectors and is equipped with elastic material, which enhances the node's ability to absorb energy under seismic loads and increases the node's self-recovery ability. During an earthquake, the built-in tie rod sleeve damper provides the node with a certain degree of horizontal movement capability, which can reduce the formation and propagation of cracks at the node.

[0044] The metal rubber and elastic padding in the built-in tie rod sleeve damper can effectively absorb seismic energy, and the high-ductility mortar filling can also play a certain buffering role; the elastic padding and metal rubber in the sleeve also allow the precast concrete frame column to have vertical structural displacement within a limited range, enhancing the seismic resistance at the structural joints.

[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 prefabricated concrete frame joint with a built-in tie rod sleeve damper, characterized in that: The system includes precast concrete frame columns (1), precast concrete frame beams (2), unbonded prestressed steel strands (3), built-in tie rod sleeve dampers (4), and precision-rolled threaded steel bars (5). The precast concrete frame columns (1) are arranged vertically, with precast concrete frame beams (2) symmetrically arranged on both sides. The connection point between the precast concrete frame columns (1) and the precast concrete frame beams (2) is a connecting section (10). The unbonded prestressed steel strands (3) pass through the middle of the connecting section (10). The two ends of the prestressed steel strand (3) extend into the precast concrete frame beam (2). A built-in tie rod sleeve damper (4) is provided at the connection section (10). Multiple built-in tie rod sleeve dampers (4) are provided, located on the upper and lower sides of the unbonded prestressed steel strand (3). The two ends of the built-in tie rod sleeve damper (4) are connected to the finely rolled threaded steel bars (5) inside the precast concrete frame beam (2). After the precast concrete frame column (1) and the precast concrete frame beam (2) are connected, the joint is filled with high ductility mortar. The built-in tie rod sleeve damper (4) includes a damping tie rod (41), a steel sleeve (42), an elastic pad (43), and a connector (46). The damping tie rod (41) passes through the inside of the steel sleeve (42) and extends to the outside of the steel sleeve (42) at both ends. The elastic pad (43) is disposed between the damping tie rod (41) and the steel sleeve (42). An elastic element is disposed between the elastic pad (43) and the damping tie rod (41). The steel sleeve (42) is detachably provided with a cover (422) at both ends. The end of the damping tie rod (41) is connected to the finely rolled threaded steel bar (5) through the connector (46). The elastic element is made of metal rubber (44), and a piston plate (45) is fixed on the damping rod (41). The two sides of the piston plate (45) are filled with metal rubber (44).

2. The prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 1, characterized in that: A first prestressed steel strand duct (11) is provided through the connecting section (10) of the precast concrete frame column (1), and a second prestressed steel strand duct (21) is provided through the precast concrete frame beam (2). The first prestressed steel strand duct (11) and the second prestressed steel strand duct (21) correspond one-to-one. Both the first prestressed steel strand duct (11) and the second prestressed steel strand duct (21) are pre-embedded with metal corrugated pipes. The metal corrugated pipe in the first prestressed steel strand duct (11) is connected to the metal corrugated pipe in the second prestressed steel strand duct (21). The unbonded prestressed steel strand (3) is threaded through the metal corrugated pipe.

3. The prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 1, characterized in that: The precast concrete frame column (1) has a through-hole (12) for the connecting section (10). Multiple through-holes (12) are provided, which are arranged parallel to the upper and lower sides of the first prestressed steel strand hole (11). The precast concrete frame beam (2) has a through-hole (22) for fine-rolled threaded steel bars corresponding to the through-hole (12). The steel sleeve (42) of the through-hole (4) for the through-hole (12) is embedded in the through-hole (12), and the fine-rolled threaded steel bars (5) are embedded in the fine-rolled threaded steel bar hole (22).

4. The prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 1, characterized in that: The connector (46) includes a threaded end (461), a fixing sleeve (462), and a locking sleeve (463). The threaded end (461) is provided with internal and external threads, the fixing sleeve (462) is provided with internal threads, and the locking sleeve (463) is provided with internal and external threads. The end of the fine-rolled threaded steel bar (5) near the precast concrete frame column (1) is provided with threads.

5. A prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 4, characterized in that: The threaded end of the finely rolled threaded steel bar (5) is connected to the internal thread of the threaded end (461), the external thread of the threaded end (461) is engaged with the internal thread of the fixed sleeve (462), the external thread of the locking sleeve (463) is engaged with the internal thread of the fixed sleeve (462), and the two ends of the damping rod (41) are respectively provided with external threads, and the external thread of the damping rod (41) is engaged with the internal thread of the locking sleeve (463).

6. The prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 1, characterized in that: The steel sleeve (42) includes a cylinder (421), with internal threads at both ends of the cylinder (421) and external threads on the cover (422). The two ends of the cylinder (421) are threadedly connected to the cover (422), and a protrusion is provided on the side of the cover (422) away from the cylinder (421).

7. The prefabricated concrete frame joint with a built-in tie rod sleeve damper according to claim 1, characterized in that: The elastic pad (43) is in contact with the caps (422) at both ends of the cylinder (421), and the metal rubber (44) on both sides of the piston plate (45) is in contact with the two caps (422).

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