Quick connector for cavity column and connecting process of quick connector
By employing an automatic locking design with locking plates and springs and a paraffin anchoring mechanism, the problems of steel bar pre-processing and crane time occupation were solved, enabling efficient installation and stable connection of the hollow column.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU HUAJIAN CONSTR
- Filing Date
- 2026-01-29
- Publication Date
- 2026-04-17
AI Technical Summary
Existing quick connectors require pre-processing of the steel bars and a long crane usage time when connecting the end steel bars of the cavity column to the embedded steel bars, which affects installation efficiency.
The design employs a locking plate and spring to automatically lock the reinforcing bar after it is inserted into the sleeve. Combined with the anchoring mechanism, a double anchoring is formed by heating and melting paraffin wax, eliminating the need for additional reinforcing bar processing and shortening the crane's operating time.
No pre-processing of steel bars is required, which shortens the time occupied by the crane and improves the installation efficiency. Furthermore, the double anchoring and the toughness buffer layer of paraffin enhance the pull-out bearing capacity and connection strength of the joint, thus extending its service life.
Smart Images
Figure CN121875436A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of rebar sleeve technology, and in particular to a quick connector for hollow columns and its connection process. Background Technology
[0002] A hollow column is a precast component in assembled concrete structures. Its core feature is that the steel cage and concrete are molded together in a factory to form a hollow column. During installation, quick connectors are now commonly used to connect the steel bars at the ends of the hollow column with the pre-embedded steel bars.
[0003] Some existing quick connectors, when in use, roll threads into the ends of the reinforcing bars, and then the internal threads of the quick connector sleeve engage with these threads to quickly connect the end reinforcing bars of the cavity column to the pre-embedded reinforcing bars.
[0004] However, in the above process, the ends of the reinforcing bars need to be prefabricated with threads in advance. Since there are a certain number of reinforcing bars and embedded reinforcing bars at the ends of the hollow column, the crane needs to maintain the hoisting of the hollow column for a period of time during the tightening process to avoid the hollow column from tilting. However, the number of cranes on the construction site is fixed, and the above-mentioned hoisting action will affect the overall installation efficiency of the hollow column. Summary of the Invention
[0005] This application proposes a quick connector for hollow columns and its connection process, which has the advantages of eliminating the need for additional steel reinforcement processing and shortening the crane usage time. This solves the problem that the increased steel reinforcement processing and crane usage time affect the overall installation efficiency of hollow columns.
[0006] To achieve the above objectives, this application adopts the following technical solution: a quick connector for a hollow column, comprising: a pre-embedded reinforcing bar, a hollow column disposed above the pre-embedded reinforcing bar, the hollow column being moved by a crane, the pre-embedded reinforcing bar being aligned with the lower end reinforcing bar of the hollow column, a threaded sleeve being disposed between the pre-embedded reinforcing bar and the lower end reinforcing bar of the hollow column, sleeves being disposed on both sides of the threaded sleeve, the end of the sleeve facing the threaded sleeve forming a threaded fixed connection with the threaded sleeve, the inner cavity of the sleeve and the side away from the threaded sleeve being a conical cavity, a locking plate being inserted into the conical cavity, the locking plates being circumferentially equidistant, when the end of the locking plate away from the threaded sleeve approaches the limit, there is a gap between adjacent locking plates, a protruding rib is disposed on the inner side of the locking plate, and a spring is disposed on the side of the locking plate facing the threaded sleeve.
[0007] Furthermore, the inner cavity of the sleeve is provided with an anchoring mechanism, the anchoring mechanism comprising: A ring is positioned between the spring and the locking plate. The inner cavity of the sleeve, especially the side closest to the threaded sleeve, is a cylindrical cavity. The ring and the cylindrical cavity form a sliding connection. The spring is positioned between the ring and the threaded sleeve and is in a pre-compressed state. A paraffin wax ring is disposed on the side of the ring facing the locking plate, and the two ends of the paraffin wax ring contact the ring and the locking plate respectively; The heat transfer wire is fixedly sleeved on the outside of the paraffin ring cylinder; A heating block is fixedly installed inside the wall of the sleeve, and the uppermost end of the heat transfer wire is inserted into the heating block.
[0008] Furthermore, the anchoring mechanism also includes: A sealing ring is fixedly installed on the inner side of the ring, and the sealing ring forms an interference fit with the inserted steel bar.
[0009] Furthermore, the end wall of the sleeve is provided with vent holes equidistantly through the inner circumference, the position of the vent holes corresponding to the space between adjacent locking plates, and the diameter of the vent holes is 0.5 mm.
[0010] Furthermore, the sealing ring is made of fluororubber, the inner side of the ring is a stepped groove, the sealing ring is set in the stepped groove, the side of the ring facing the paraffin ring cylinder is a concave conical surface, and a mica heat insulation pad is fixedly installed on the concave conical surface. The thickness of the mica heat insulation pad is two millimeters.
[0011] Furthermore, the paraffin ring is made of low-shrinkage paraffin material.
[0012] Furthermore, both the heating block and the heat transfer wire are made of copper, the surface of the heat transfer wire is coated with polytetrafluoroethylene, the thickness of the coating is 0.1 mm, and the contact area between the heating block and the heat transfer wire is coated with thermally conductive silicone grease.
[0013] A cavity post connection process using quick connectors includes the following steps: Step 1: Use a wire brush to thoroughly clean the ends of the pre-embedded steel bars and the ends of the steel bars in the cavity column to be assembled within a mm range, removing rust, oil, concrete residue and other impurities. Check the integrity of the transverse ribs of the steel bars. If there is any damage or bending, straighten or cut them to ensure that the ends of the steel bars are flat and that there is no obstruction in the insertion direction. Step 2: Place one locking piece into the corresponding conical cavity of the sleeve, ensuring that the conical surface of the locking piece fits snugly against the conical cavity of the sleeve. Then, place the corresponding heat transfer wire into the cylindrical cavity of the sleeve, with the end of the heat transfer wire extending into the position of the subsequent heating block. Next, place the paraffin ring inside the heat transfer wire, and place the ring and spring into the sleeve in sequence. Then, screw the end of the sleeve away from the locking piece into the inner hole of the threaded sleeve, so that the spring is pre-compressed and abuts against the threaded sleeve. Then, screw the corresponding heating block into the sleeve, and insert the end of the heat transfer wire into and abut against the heating block. Then, perform the same operation on the structure inside the other sleeve to complete the pre-assembly of the connector assembly. Step 3: Press down the connector so that the end of the pre-embedded steel bar is inserted into the sleeve on one side, so that the pre-embedded steel bar passes through the locking plate, paraffin ring, sealing ring, ring and spring. The insertion depth is performed according to the design mark to ensure that the end of the steel bar reaches the preset position. The locking plate naturally hugs the outer cylindrical surface of the steel bar under the action of the spring. Step 4: Hoist the hollow column and lower it to a position above the connector. Then, manually adjust the position of the hollow column so that the steel bar at the lower end of the hollow column is aligned with the pre-embedded steel bar. Then, let the hollow column continue to move down so that the steel bar at the lower end of the hollow column is inserted into the sleeve on the other side. The steel bar passes through the locking plate, paraffin ring, sealing ring, ring and spring. The insertion depth is performed according to the design mark. Under the action of the spring, the locking plate naturally hugs the outer surface of the steel bar, realizing the rapid connection between the hollow column and the pre-embedded steel bar. Step 5: Use a portable tensile testing tool to randomly inspect the connection nodes. Apply 80% of the design allowable tensile force, hold the load for 5 minutes, and then check for residual deformation to ensure it is ≤0.14mm. Visually inspect each component of the connector for looseness or deformation, ensure the locking plates are not scattered, and check for obvious displacement of the reinforcing bars. After passing the inspection, mark the connection nodes, use diagonal braces to support and fix the hollow column, and remove the crane. Step Six: The construction worker holds the operating heating element and touches the heating block in sequence, causing the heating block to heat up the heat transfer wire. This heats up the paraffin ring inside the heat transfer wire, causing it to melt. The pre-compressed spring releases its elasticity and pushes the ring. The ring carries the melted paraffin into the space between the sleeve, the locking plate, and the reinforcing bar. After a period of time, the heating element is removed, allowing the heat from the melted paraffin to be transferred to the outside through the sleeve, gradually solidifying to form a solid support layer. This layer then mechanically engages with the locking plate to form a double anchor.
[0014] This application has the following beneficial effects: This application provides a quick connector for hollow columns. Through the arrangement of a locking plate and a spring, the spring pushes and supports the locking plate. When the reinforcing bar is inserted into the sleeve, it drives the locking plate to compress the spring, causing the locking plate to expand outward along the conical cavity inside the sleeve. When the reinforcing bar is fully inserted into the sleeve, the protrusion on the locking plate engages with the ribs of the reinforcing bar, thereby automatically locking the reinforcing bar. With the above arrangement, no additional processing of the reinforcing bar or tightening work is required, thus shortening the time occupied by the crane and making the overall installation efficiency of the hollow column less affected.
[0015] By setting up locking plates, springs, and anchoring mechanisms, after the aforementioned reinforcing bars are automatically locked, the cavity column is fixed, and the crane is removed. Then, the paraffin ring between the locking plates and springs is heated and melted, causing the pre-compressed spring to push the ring and drive the melted paraffin into the space between the sleeve, locking plates, and reinforcing bars. After melting, the paraffin, with its high fluidity, fills the microscopic gaps between the sleeve, locking plates, and reinforcing bars. Then, the paraffin solidifies to form a solid support layer, which, together with the mechanical engagement of the locking plates, forms a "double anchoring," significantly reducing the risk of micro-slippage of the reinforcing bars within the sleeve and improving the pull-out bearing capacity of the joint.
[0016] Through the arrangement of locking plates, springs, and anchoring mechanisms, the solidified paraffin wax possesses a certain degree of toughness and viscoelasticity, serving as a vibration buffer layer. Under daily building vibration loads (such as equipment operation), it can absorb some alternating stress, preventing the locking plates from fatigue loosening due to long-term rigid friction and extending the service life of the joint. Simultaneously, under the compression of the spring, the flowing molten paraffin wax applies pressure to the locking plates, further pressing them against the surface of the reinforcing bars and improving the connection strength of the reinforcing bars. Attached Figure Description
[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.
[0018] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram showing the connection state between the hollow column and the pre-embedded steel bars of the present invention; Figure 2 This is a schematic diagram of the assembly state of the sleeve and threaded sleeve of the present invention; Figure 3 This is a schematic diagram of the internal structure of the sleeve and threaded sleeve of the present invention; Figure 4 This is a schematic cross-sectional view of the internal structure of the sleeve and threaded sleeve of the present invention; Figure 5 This is a schematic diagram of the locking plate assembly state of the present invention; Figure 6 This is a schematic diagram showing the relative positions of the paraffin ring, heat transfer wire, and heating block of the present invention. Figure 7This is a schematic diagram showing the relative positions of the spring and the ring in this invention.
[0019] In the diagram: 1. Embedded steel bar; 2. Hollow column; 3. Screw sleeve; 4. Sleeve; 5. Locking plate; 6. Spring; 7. Anchoring mechanism; 70. Ring; 71. Paraffin ring cylinder; 72. Heat transfer wire; 73. Heating block; 74. Sealing ring; 8. Vent hole. Detailed Implementation
[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0021] Example 1: Please refer to Figures 1-7 A quick connector for a hollow column includes a pre-embedded reinforcing bar 1, a hollow column 2 positioned above the pre-embedded reinforcing bar 1, the hollow column 2 being moved by a crane, the pre-embedded reinforcing bar 1 and the lower end reinforcing bar of the hollow column 2 being aligned one-to-one, a threaded sleeve 3 being provided between the pre-embedded reinforcing bar 1 and the lower end reinforcing bar of the hollow column 2, sleeves 4 being provided on both sides of the threaded sleeve 3, the end of the sleeve 4 facing the threaded sleeve 3 forming a threaded fixed connection with the threaded sleeve 3, the inner cavity of the sleeve 4 and the side away from the threaded sleeve 3 being a conical cavity, a locking piece 5 being inserted into the conical cavity, the locking pieces 5 being circumferentially equidistant, when the end of the locking piece 5 away from the threaded sleeve 3 is brought close to the limit, there is a gap between adjacent locking pieces 5, the inner side of the locking piece 5 is provided with a protrusion, and a spring 6 is provided on the side of the locking piece 5 facing the threaded sleeve 3.
[0022] In use, first, assemble the lower sleeve 4 of the connector with the pre-embedded reinforcing bar 1. Then, use a crane to move the hollow column 2 above the pre-embedded reinforcing bar 1, aligning the reinforcing bar at the lower end of the hollow column 2 with the pre-embedded reinforcing bar 1. Next, use the crane to gradually lower the hollow column 2, causing the lower end of the reinforcing bar to gradually insert into the upper sleeve 4 of the connector. After the reinforcing bar is inserted into the sleeve 4, it will cause the corresponding locking plate 5 to compress the spring 6, causing the locking plate 5 to expand outward along the conical cavity inside the sleeve 4 (because the locking plate 5 in the initial position is closer to the conical cavity). The tip of the locking plate 5 is slightly close to the large cross-section end of the conical cavity after the rebar is inserted into the sleeve 4 (the end of the rebar contacts the threaded sleeve 3). The protrusion on the locking plate 5 engages with the rib of the rebar (because the side of the protrusion facing away from the threaded sleeve 3 is an arc surface, and the end facing the threaded sleeve 3 is a plane, this plane engages with the rib of the rebar), thereby achieving automatic locking of the rebar. With the above settings, no additional processing of the rebar is required (the connector can be pre-assembled), and no tightening operation is required, thereby shortening the time occupied by the crane and making the overall installation efficiency of the cavity column 2 less affected.
[0023] Example 2: To further secure the reinforcing bars, please refer to... Figures 1-7 The inner cavity of the sleeve 4 is provided with an anchoring mechanism 7, which includes a ring 70, a paraffin ring 71, a heat transfer wire 72, and a heating block 73. The ring 70 is located between the spring 6 and the locking plate 5. The inner cavity of the sleeve 4 and the side near the threaded sleeve 3 is a cylindrical cavity. The ring 70 and the cylindrical cavity form a sliding connection. The spring 6 is located between the ring 70 and the threaded sleeve 3 and is in a pre-compressed state. The paraffin ring 71 is provided on the side of the ring 70 facing the locking plate 5. The two ends of the paraffin ring 71 contact the ring 70 and the locking plate 5 respectively. The heat transfer wire 72 is spirally sleeved on the outer side of the paraffin ring 71. The heating block 73 is installed in the internal thread of the sleeve 4. The uppermost end of the heat transfer wire 72 is inserted into the heating block 73.
[0024] After the aforementioned reinforcing bars are automatically locked by the locking plate 5, the cavity column 2 is fixed (in the prior art, a through hole on the side wall of the cavity column 2 is connected to a through hole in the ground via a diagonal rod, thereby supporting and fixing the cavity column 2), and the crane is removed. Then, an external heating element (such as an electric heating rod, the heating temperature of which is always below 100 degrees Celsius) contacts the heating block 73, causing the heating block 73 to drive the heat transfer wire 72 to heat up, causing the paraffin ring 71 inside the heat transfer wire 72 to melt, causing the pre-compressed spring 6 to release its elasticity and push the ring 70. The ring 70 carries the melted paraffin into the position between the sleeve 4, the locking plate 5, and the reinforcing bar (during this process, the ring 70 compresses the heat transfer wire 72). This causes the spirally arranged heat transfer wire 72 to tighten. After the paraffin melts, its high fluidity fills the microscopic gaps between the sleeve 4, the locking plate 5, and the reinforcing bar. After a period of time (depending on the time required for the paraffin ring 71 to completely melt, since the melting point of paraffin is 58 to 62 degrees Celsius, while the surface temperature of the heat transfer wire 72 is less than or equal to 100 degrees Celsius, the time for the paraffin to completely melt is usually measured in seconds), the external heating element is removed, allowing the heat from the melted paraffin to be transferred to the outside through the sleeve 4, and then gradually solidifies to form a solid support layer. This layer, along with the mechanical engagement of the locking plate 5, forms a "double anchoring," significantly reducing the risk of micro-slippage of the reinforcing bar within the sleeve 4 and improving the pull-out bearing capacity of the joint. Meanwhile, the solidified paraffin wax has a certain toughness and viscoelasticity, and can be used as a vibration buffer layer. Under the daily vibration load of buildings (such as when applied in a factory environment, the vibration of equipment operation will be transmitted to the sleeve 4), it can absorb some of the alternating stress, prevent the locking plate 5 from fatigue loosening due to long-term rigid friction, and extend the service life of the joint. At the same time, under the compression of spring 6, the flowing molten paraffin will apply pressure to locking plate 5, thereby pressing locking plate 5 further against the surface of the steel bar and improving the connection strength of the steel bar; In addition, paraffin is a hydrophobic material. After solidification, it can form a sealed isolation layer between the reinforcing bar and the inner wall of the sleeve 4, which isolates air, moisture and corrosive media (such as chloride ions), prevents the reinforcing bar from rusting and the inner wall of the sleeve 4 from oxidizing, and solves the hidden danger of "rust and loosening" due to the gap in the sleeve 4. It is especially suitable for harsh environments such as humid and saline-alkali environments.
[0025] To prevent paraffin wax from blistering at four points on the sleeve, please refer to [link / reference]. Figures 1-7 The anchoring mechanism 7 also includes a sealing ring 74, which is fixedly installed on the inner side of the ring 70 and forms an interference fit with the inserted steel bar.
[0026] When the above-mentioned reinforcing bar is inserted into the sleeve 4, it will pass through the sealing ring 74 inside the ring 70. Due to the interference fit, the sealing ring 74 is tightly attached to the surface of the reinforcing bar, thereby sealing the gap between the ring 70 and the reinforcing bar, so that the reinforcing bar is accurately positioned on the central axis of the sleeve 4. This double guarantee ensures the coaxial positioning of the reinforcing bar, avoids eccentricity, and also avoids uneven paraffin filling caused by eccentricity of the reinforcing bar. In addition, the sealing ring 74 completely seals the gap between the ring 70 and the reinforcing bar, so that the subsequently melted paraffin wax will not contact the spring 6, thereby preventing the paraffin wax from affecting the movement of the spring 6. This allows the melted paraffin wax to move completely to the position of the locking piece 5, increasing the utilization rate of the paraffin wax and preventing the locking piece 5 inside the sleeve 4 from becoming hollow, thus increasing the fixing strength of the reinforcing bar.
[0027] To purge the air from sleeve 4, please refer to [link / reference]. Figures 1-7 The end wall of the sleeve 4 has vent holes 8 that are equidistantly opened in the inner circumference. The position of the vent holes 8 corresponds to the space between adjacent locking plates 5. The diameter of the vent holes 8 is 0.5 mm.
[0028] During the movement of the molten paraffin wax driven by the aforementioned ring 70, air in the direction of movement is compressed, causing this air to be discharged into the external environment through the gap between the vent hole 8 and the structure. (The paraffin wax does not easily leak to the outside through the vent hole 8. The microscopic gap between the locking plate 5 and the reinforcing bar is 0.8 to 1.5 mm, which is much larger than the diameter of the vent hole 8. Under the thrust of the spring 6, the liquid paraffin wax will follow the path of least resistance to flow. Therefore, the resistance to filling the large gap is much less than the resistance to passing through the 0.5 mm vent hole 8. Thus, the paraffin wax will preferentially fill the gap between the locking plate 5 and the reinforcing bar.) Instead of flowing towards the vent hole 8, the surface tension of paraffin wax is about 25~30mN / m (liquid at 65℃). Within the vent hole 8 with a diameter of 0.5 mm, the surface tension will form a meniscus liquid seal to prevent the paraffin wax from leaking out, thereby maintaining the filling amount of paraffin wax and making the fixing strength of the reinforcing bar less susceptible to impact. This will reduce the occurrence of voids at the position of the locking piece 5 inside the sleeve 4, thereby increasing the connection and fixing strength of the reinforcing bar (while the cavity inside the sleeve 4 where the spring 6 is located will draw in outside air through the thread gap between the threaded sleeve 3 and the sleeve 4).
[0029] Please see Figures 1-7 The sealing ring 74 is made of fluororubber. The inner side of the ring 70 is a stepped groove, and the sealing ring 74 is set in the stepped groove. The side of the ring 70 facing the paraffin ring 71 is a concave conical surface. A mica heat insulation pad is fixedly installed on the concave conical surface. The thickness of the mica heat insulation pad is two millimeters.
[0030] The temperature threshold of the fluororubber sealing ring 74 is 200 degrees Celsius, which is much higher than the melting point of paraffin wax, thus avoiding the influence of melted paraffin wax and causing seal failure. Meanwhile, since the sealing ring 74 is located in the stepped groove of the ring 70, and the end face of the sealing ring 74 is in contact with the bottom surface of the stepped groove, when the spring 6 drives the ring 70 to move, the melted paraffin wax will apply axial pressure to the sealing ring 74, making the sealing ring 74 fit more tightly with the steel bar, thereby preventing paraffin wax leakage and maintaining the amount of paraffin wax filling. At the same time, the concave conical surface of the ring 70 increases the contact area between the ring 70 and the liquid paraffin, reducing the pushing dead angle; In addition, by setting the mica heat insulation pad, the elastic force of the spring 6 is prevented from decreasing due to heat, thereby maintaining the movement distance of the liquid paraffin and making the amount of contact between the paraffin and the locking plate 5 less affected, thereby improving the connection and fixing strength of the steel bar.
[0031] Paraffin ring 71 is made of low-shrinkage paraffin material (modified with 3% microcrystalline wax, shrinkage rate less than or equal to 1%).
[0032] Low-shrinkage paraffin wax is selected to avoid gaps after the paraffin wax solidifies, thereby increasing the contact area between the paraffin wax and the locking plate 5, sleeve 4, and reinforcing bar, and improving the connection and fixing strength of the reinforcing bar.
[0033] Both the heating block 73 and the heat transfer wire 72 are made of copper. The surface of the heat transfer wire 72 is coated with polytetrafluoroethylene, and the thickness of the coating is 0.1 mm. Thermal grease is applied to the contact area between the heating block 73 and the heat transfer wire 72.
[0034] By using thermally conductive silicone grease (thermal conductivity 1.5 W / (m・K)), the contact thermal resistance between the heating block 73 and the heat transfer wire 72 is further reduced, improving the synchronicity of heat transfer and accelerating the melting speed of the paraffin ring cylinder 71.
[0035] Example 3: A cavity post connection process using quick connectors, comprising the following steps: Step 1: Use a wire brush to thoroughly clean the rust, oil, concrete residue and other impurities within 50mm of the end of the pre-embedded steel bar 1 and the end of the steel bar of the cavity column 2 to be assembled. Check the integrity of the transverse ribs of the steel bar. If there is any damage or bending, it needs to be straightened or cut to ensure that the end of the steel bar is flat and there is no obstruction in the insertion direction. Step 2: Place one side of the locking plate 5 into the conical cavity of the corresponding sleeve 4, ensuring that the conical surface of the locking plate 5 fits against the conical cavity of the sleeve 4. Then, place the corresponding heat transfer wire 72 into the cylindrical cavity of the sleeve 4, and extend the end of the heat transfer wire 72 into the position of the subsequent heating block 73. Next, place the paraffin ring 71 inside the heat transfer wire 72, and place the ring 70 and the spring 6 into the sleeve 4 in sequence. Then, screw the end of the sleeve 4 away from the locking plate 5 into the inner hole of the threaded sleeve 3, so that the spring 6 is pre-compressed and abuts against the threaded sleeve 3. Then, screw the corresponding heating block 73 into the sleeve 4, and insert the end of the heat transfer wire 72 into and abut against the heating block 73. Then, perform the same operation on the structure inside the other side of the sleeve 4 to complete the pre-assembly of the connector assembly. Step 3: Press down the connector so that the end of the pre-embedded steel bar 1 is inserted into the sleeve 4 on one side, so that the pre-embedded steel bar 1 passes through the locking piece 5, the paraffin ring 71, the sealing ring 74, the ring 70 and the spring 6. The insertion depth is performed according to the design mark (the mark position needs to be engraved on the steel bar in advance) to ensure that the end of the steel bar reaches the preset position. Under the action of the spring 6, the locking piece 5 naturally hugs the outer column surface of the steel bar. Step 4: Hoist the hollow column 2 and lower it to a position above the connector. Then, manually adjust the position of the hollow column 2 so that the steel bar at the lower end of the hollow column 2 is aligned with the pre-embedded steel bar 1. Then, let the hollow column 2 continue to move down so that the steel bar at the lower end of the hollow column 2 is inserted into the sleeve 4 on the other side. The steel bar passes through the locking piece 5, the paraffin ring 71, the sealing ring 74, the ring 70 and the spring 6. The insertion depth is performed according to the design mark (the mark position needs to be engraved on the steel bar in advance). Under the action of the spring 6, the locking piece 5 naturally hugs the outer surface of the steel bar, realizing the rapid connection between the hollow column 2 and the pre-embedded steel bar 1. Step 5: Use a portable tensile testing tool to randomly inspect the connection nodes. Apply 80% of the design allowable tensile force, hold the load for 5 minutes, and then check for residual deformation to ensure it is ≤0.14mm. Visually inspect each component of the connector for looseness or deformation, ensure that the locking plate 5 is not scattered, and that the reinforcing bars are not significantly displaced. After passing the inspection, mark the connection nodes, use diagonal braces to support and fix the cavity column 2, and remove the crane. Step Six: The construction worker holds the operating heating element and contacts the heating block 73 in sequence, causing the heating block 73 to drive the heat transfer wire 72 to heat up. This causes the paraffin ring 71 inside the heat transfer wire 72 to melt, causing the pre-compressed spring 6 to release its elasticity and push the ring 70. The ring 70 carries the melted paraffin into the position between the sleeve 4, the locking plate 5 and the steel bar. After a period of time, the heating element is removed, allowing the heat from the melted paraffin to be transferred to the outside through the sleeve 4, and then gradually solidify to form a solid support layer, which mechanically interlocks with the locking plate 5 to form a double anchor.
Claims
1. A quick connector for a cavitied post, comprising: An embedded steel bar (1) is provided above the embedded steel bar (1), and a hollow column (2) is provided above the hollow column (2). The hollow column (2) is moved by a crane. The embedded steel bar (1) and the lower end steel bar of the hollow column (2) are aligned one by one. The embedded steel bar (1) and the lower end steel bar of the hollow column (2) are provided with a threaded sleeve (3). Both sides of the threaded sleeve (3) are provided with sleeves (4). The end of the sleeve (4) facing the threaded sleeve (3) is threadedly fixed to the threaded sleeve (3). The inner cavity of the sleeve (4) and the side away from the threaded sleeve (3) is a conical cavity. A locking piece (5) is inserted into the conical cavity. The locking pieces (5) are circumferentially equidistant. When the end of the locking piece (5) away from the threaded sleeve (3) approaches the limit, there is a gap between adjacent locking pieces (5). The inner side of the locking piece (5) is provided with a protrusion. The side of the locking piece (5) facing the threaded sleeve (3) is provided with a spring (6).
2. A quick connector for a cavity post according to claim 1, wherein The inner cavity of the sleeve (4) is provided with an anchoring mechanism (7), the anchoring mechanism (7) includes: The ring (70) is positioned between the spring (6) and the locking piece (5). The inner cavity of the sleeve (4) and the side near the threaded sleeve (3) is a cylindrical cavity. The ring (70) and the cylindrical cavity form a sliding connection. The spring (6) is positioned between the ring (70) and the threaded sleeve (3). The spring (6) is in a pre-compressed state. A paraffin ring cylinder (71) is disposed on the side of the ring (70) facing the locking piece (5), and the two ends of the paraffin ring cylinder (71) respectively contact the ring (70) and the locking piece (5). The heat transfer wire (72) is fixedly sleeved on the outside of the paraffin ring (71); The heating block (73) is fixedly installed in the wall of the sleeve (4), and the uppermost end of the heat transfer wire (72) is inserted into the heating block (73).
3. A quick connector for a cavity post according to claim 2, characterized in that, The anchoring mechanism (7) further includes: A sealing ring (74) is fixedly installed on the inner side of the ring (70), and the sealing ring (74) forms an interference fit with the inserted steel bar.
4. A quick connector for a cavity post according to claim 3, wherein The sleeve (4) has vent holes (8) that are equidistantly opened in the inner circumference of the end wall. The position of the vent holes (8) corresponds to the space between adjacent locking plates (5). The diameter of the vent holes (8) is 0.5 mm.
5. A quick connector for a cavity post according to claim 3, wherein The sealing ring (74) is made of fluororubber. The inner side of the ring (70) is a stepped groove. The sealing ring (74) is set in the stepped groove. The side of the ring (70) facing the paraffin ring cylinder (71) is a concave conical surface. A mica heat insulation pad is fixedly installed on the concave conical surface. The thickness of the mica heat insulation pad is two millimeters.
6. A quick connector for a cavity post according to claim 2, characterized in that, The paraffin ring (71) is made of low-shrinkage paraffin material.
7. A quick connector for a cased column according to claim 2, wherein The heating block (73) and the heat transfer wire (72) are both made of copper. The surface of the heat transfer wire (72) is coated with polytetrafluoroethylene, and the thickness of the coating is 0.1 mm. Thermal grease is applied to the contact area between the heating block (73) and the heat transfer wire (72).
8. A cavity column connection process using the quick connector of claim 4, characterized by, Includes the following steps: Step 1: Use a wire brush to thoroughly clean the rust, oil stains, concrete residue and other impurities within mm of the ends of the pre-embedded steel bars (1) and the ends of the hollow column to be assembled (2). Check the integrity of the transverse ribs of the steel bars. If there is any damage or bending, straightening or cutting is required to ensure that the ends of the steel bars are flat and that there is no obstruction in the insertion direction. Step 2: Place one side locking plate (5) into the conical cavity of the corresponding sleeve (4), ensuring that the conical surface of the locking plate (5) fits against the conical cavity of the sleeve (4). Then, place the corresponding heat transfer wire (72) into the cylindrical cavity of the sleeve (4), and extend the end of the heat transfer wire (72) into the position of the subsequent heating block (73). After that, place the paraffin ring (71) inside the heat transfer wire (72), and place the ring (70) and spring (6) into the sleeve in sequence. Inside the sleeve (4), the end of the sleeve (4) away from the locking piece (5) is screwed into the inner hole of the screw sleeve (3) through the thread, so that the spring (6) is pre-compressed and abuts against the screw sleeve (3). Then, the corresponding heating block (73) is screwed into the sleeve (4) through the thread, and the end of the heat transfer wire (72) is inserted into and abuts against the heating block (73). Then, the same operation is performed on the structure inside the other sleeve (4) to complete the pre-assembly of the connector assembly. Step 3: Press down the connector so that the end of the pre-embedded steel bar (1) is inserted into the sleeve (4) on one side, so that the pre-embedded steel bar (1) passes through the locking plate (5), the paraffin ring (71), the sealing ring (74), the ring (70) and the spring (6). The insertion depth is performed according to the design mark to ensure that the end of the steel bar reaches the preset position. The locking plate (5) naturally hugs the outer column surface of the steel bar under the action of the spring (6). Step 4: Hoist the hollow column (2) and move it down to the position above the connector. Then, manually adjust the position of the hollow column (2) so that the steel bar at the lower end of the hollow column (2) is aligned with the pre-embedded steel bar (1). Then, let the hollow column (2) continue to move down so that the steel bar at the lower end of the hollow column (2) is inserted into the sleeve (4) on the other side. The steel bar passes through the locking plate (5), the paraffin ring (71), the sealing ring (74), the ring (70) and the spring (6). The insertion depth is performed according to the design mark. The locking plate (5) naturally hugs the outer surface of the steel bar under the action of the spring (6), realizing the rapid connection between the hollow column (2) and the pre-embedded steel bar (1). Step 5: Use a portable tensile testing tool to conduct random checks on the connection nodes. Apply 80% of the design allowable tensile force, hold the load for 5 minutes, and then check the residual deformation to ensure that it is ≤0.14mm. Visually check that there is no looseness or deformation in each component of the connector, that the locking plate (5) is not scattered, and that the reinforcing bars are not obviously displaced. After the test is qualified, mark it, use diagonal braces to support and fix the cavity column (2), and remove the crane. Step 6: The construction worker holds the operating heating element and touches the heating block (73) in turn, so that the heating block (73) drives the heat transfer wire (72) to heat up, so that the paraffin ring (71) inside the heat transfer wire (72) is heated and melted, so that the pre-compressed spring (6) releases its elasticity and pushes the ring (70). The ring (70) drives the melted paraffin into the position between the sleeve (4), the locking plate (5) and the steel bar. After a period of time, the heating element is removed, so that the heat of the melted paraffin is transferred to the outside through the sleeve (4), and then gradually solidifies to form a solid support layer, and forms a double anchor with the mechanical engagement of the locking plate (5).