Fabricated steel pipe concrete column-column connecting joint and construction method thereof

Abstract

This invention discloses a prefabricated steel-concrete composite column-column connection node and its construction method, including an upper column and a lower column below it. A guide block is fixedly installed at the center of the bottom end of the upper column, and a guide groove is opened at the top end of the lower column. The guide groove and the guide block are squeezed together, and a locking mechanism is fixedly installed at the top end of the lower column. This invention provides a large tolerance space in the initial stage of insertion through the wedge-tight contact between the conical guide groove and the conical guide block, solving the problem of alignment difficulties caused by slight shaking during high-altitude hoisting. It achieves non-directional access in all circumferences. Workers can achieve "blind insertion" rapid docking without tedious angle adjustments for specific bolt hole positions, shortening the operation time of high-altitude hoisting, reducing shift costs and safety risks, and truly achieving ultra-fast assembly. In addition, the tapered conical surface can smoothly transfer loads, effectively alleviate stress concentration at the connection edge, and extend the fatigue life of the node.

Description

Technical Field

[0001] This invention relates to the field of steel-concrete composite connection technology, specifically to a prefabricated steel-concrete composite column-to-column connection node and its construction method. Background Technology

[0002] Precast concrete-filled steel tube columns are composite structural columns formed by filling steel tubes with concrete. They are constructed using a precast method of "factory prefabrication and on-site assembly," utilizing the physical properties of both materials: the steel tube creates a "hoop effect" on the internal concrete, restricting its lateral expansion and significantly improving its compressive strength and deformation capacity; simultaneously, the internal concrete provides support, preventing local buckling (collapse) of the outer thin-walled steel tube. These columns have high load-bearing capacity, good seismic performance, and because the steel tube itself can serve as formwork for concrete pouring, they save significant amounts of formwork work.

[0003] However, the joints between columns are complex and difficult to construct. The connections between columns and between columns and steel beams (or concrete beams) usually need to be completed by flanges, sleeves, high-strength bolts or on-site welding. The complex joint design not only increases the cost of manufacturing materials, but also makes on-site splicing extremely cumbersome. Furthermore, complex joints are prone to causing structural stress concentration problems.

[0004] Therefore, how to design a new type of prefabricated steel-concrete composite column-column connection node and its construction method is a technical problem that technicians need to solve. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated steel-concrete composite column-column connection node and its construction method to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A prefabricated steel-concrete composite column-column connection node includes an upper column and a lower column below it. A guide block is fixedly installed at the center of the bottom end of the upper column, and a guide groove is opened at the top end of the lower column, with the guide groove and guide block in a pressing fit. A locking mechanism is fixedly installed at the top end of the lower column, with the locking mechanism and guide block in a pressing fit. Several self-checking mechanisms are installed in a ring shape inside the bottom ends of the upper and lower columns, with the self-checking mechanisms and locking mechanisms in a pressing fit. The locking mechanism includes a fixed seat fixedly installed at the top end of the lower column, with several installation grooves equidistantly opened on the fixed seat. A pressing seat is slidably connected inside the installation grooves. A limiting spring is installed at the bottom end of the pressing seat, with the limiting spring and fixed seat in a fit. The pressing seat and guide block are inserted into each other, and the guide block has a mating groove inside that presses against the pressing seat.

[0007] The specific working process for connecting the upper and lower columns is as follows: When the upper and lower columns need to be docked, the upper column is transported to directly above the lower column using a hoisting device and slowly lowered. During the lowering process, the conical guide block at the bottom of the upper column automatically slides into the conical guide groove at the top of the lower column. The sliding friction of the conical inclined surface achieves initial guidance and automatic correction of spatial posture, thereby achieving coarse guidance and ensuring the efficiency of the docking process. Furthermore, the upper and lower columns are not connected by bolts, achieving non-directional access in all circumferences. During construction, there is no need for precise angle adjustments to specific bolt hole positions, greatly shortening the operation time for high-altitude hoisting and enhancing the ease of docking the device. As the upper column continues to settle under gravity, the device enters the automatic locking stage. The self-weight load of the upper column drives the locking mechanism to unfold, achieving a locking connection between the upper and lower columns. At the end of the final locking stroke of the locking mechanism, the self-inspection mechanism is triggered to enter the working state. The self-inspection mechanism uses visual feedback so that workers can intuitively confirm that the locking mechanism has unfolded to the preset locking position. Through the cooperation of the locking mechanism and the self-inspection mechanism, the locking connection between the upper and lower columns can be completed, and it is possible to intuitively observe whether the device is locked, ensuring the safety and reliability of the connection work.

[0008] Furthermore, the guide groove has a tapered guide surface that tapers along its insertion direction, and the guide block has a tapered outer wall that matches the shape of the tapered guide surface; the guide block fits into the guide groove and forms a wedge-tight contact with the tapered guide surface.

[0009] Relying on the "gradual contraction" characteristic of the guide groove and the "adaptive cone" shape of the guide block, a large margin of error is provided in the initial stage of insertion. As the upper column falls, the contact force between the cone surfaces forcibly transforms the irregular eccentric displacement into a centering force pointing towards the axis. This not only solves the alignment problem caused by slight swaying during high-altitude hoisting, but also ensures that the upper and lower columns are in a precise coaxial state before the locking mechanism is activated, facilitating subsequent work and deployment of the device. The cone-shaped guide surface is a fully circumferentially symmetrical (or multi-symmetrical) structure. Combined with the boltless design, workers do not need to perform tedious rotation of the upper column at high altitudes during hoisting. The adjustment (i.e., the "hole finding" process) allows for rapid "blind insertion" docking by inducing the conical surface as long as the upper column is roughly above the lower column. This improvement greatly reduces the daily operating costs of hoisting equipment and the safety risks of high-altitude operations, realizing the "rapid assembly" pursued by prefabricated buildings. The conical surface contact transforms point or line contact into surface contact. When bearing longitudinal axial force, the tapered conical surface shares part of the vertical load and transforms it into radial pressure, making the force transmission at the connection interface smoother. This effectively alleviates the stress concentration phenomenon of the steel pipe column wall at the connection edge and helps to extend the fatigue life of the joint.

[0010] Furthermore, the locking mechanism also includes a limiting ring fixedly installed inside the guide block mating groove. One end of the pressing seat is provided with a pressing groove that presses against the limiting ring. The end of the pressing seat away from the pressing groove is provided with a mating inclined surface that presses against the pressing seat. Guide hook grooves are fixedly installed on the upper and lower surfaces of the pressing seat, and the guide hook grooves press against the mating groove inside the guide block.

[0011] The extrusion column is subjected to force and applies an axial driving force to the extrusion seat. Guided by this force, the extrusion seat performs a high-precision linear displacement along the preset mounting groove, causing its end to precisely wedge into the internal mating groove of the guide block at the bottom of the upper column. This step initially limits the relative displacement of the connection node in the radial direction. As the extrusion seat continues to wedge in, the extrusion groove at its end interferes with the limiting ring inside the guide block. Utilizing the geometric slope difference between the limiting ring and the V-shaped extrusion groove, a strong lateral expansion force is generated, inducing elastic expansion at the end of the extrusion seat. This expansion mechanism transforms the outer wall of the extrusion seat and the inner surface of the mating groove from a "sliding gap" to a "high-pressure surface contact." This frictional self-locking completely eliminates loosening of the connection interface in the circumferential (rotational) dimension, ensuring the stability of the column under torsional load. To further anchor the axial degree of freedom and prevent the upper column from coming off, while the expansion action is performed at the end of the extrusion seat, the corresponding features of the guide hook groove and the internal mating groove of the guide block form a mechanical engagement and embedded abutment. This "guide hook-groove" extrusion engagement makes the node enter a physically locked state. The device simultaneously completes the three-way locking form of axial limiting, radial pressing and circumferential locking through a single horizontal linear drive. This not only increases the connection fit, but also eliminates the sudden change in stiffness of the assembled node at the moment of connection through mechanical interference.

[0012] It should be noted that in order to achieve a strong engagement between the guide hook groove and the mating groove, the inner wall of the mating groove is provided with a force-bearing bevel, the slope direction of which is opposite to the direction of the hook part of the guide hook groove. When the extrusion seat expands, the guide hook groove is not only compressed radially, but its hook-shaped tip will also have a tendency to "tighten as it is pulled" along the slope of the mating groove. This slope engagement converts the radial expansion force into the axial pull-out force.

[0013] Furthermore, the inner radial protrusion of the limiting ring forms a triangular positioning part, and the extrusion groove has a constricted V-shaped groove structure with the opening facing the triangular positioning part, and the edge of the triangular positioning part is embedded in the constricted V-shaped groove.

[0014] The "edges" of the triangular positioning part exhibit line contact characteristics, while the converging V-groove provides an effective guiding slope. Compared to flat extrusion, the edge embedded in the V-groove generates extremely high local contact pressure. This allows the locking mechanism to quickly penetrate surface rust or machining burrs at the moment of triggering, achieving instantaneous engagement. This significantly shortens the time from "initial contact" to "complete locking," improving the sensitivity of the self-locking action. The converging structure of the V-groove has a centering and closing characteristic. During the forward sliding of the extrusion seat, if a slight positional shift occurs, the edges of the triangular positioning part will... Automatically sliding along the inclined surface of the V-groove towards the center of the groove bottom, this self-correcting function ensures that all extrusion seats can act synchronously and symmetrically on the upper column, avoiding uneven force distribution at the nodes caused by eccentric extrusion, and ensuring the verticality of the upper and lower columns after connection. When the triangular edge is deeply wedged into the constricted V-groove, it will generate a huge radial component force due to the reaction force of the inclined surfaces on both sides of the V-groove, which efficiently converts the axial extrusion force into an outward expansion force, allowing the end of the extrusion seat to generate a large radial displacement with a small thrust, thereby forming an ultra-tight interference fit with the mating groove inside the guide block.

[0015] Furthermore, the self-inspection mechanism includes mounting tubes that are equidistantly fixed at the bottom of the upper and lower columns. The end of the mounting tube near the guide block has a mounting chamber. A piston seat is slidably connected inside the mounting chamber. An auxiliary spring is installed inside the mounting chamber, and the auxiliary spring and the piston seat are in a compression fit. A compression rod is fixedly installed at the end of the piston seat away from the auxiliary spring. A guide groove that compresses with the compression rod is opened at the end of the compression seat. A baffle is fixedly installed at the end of the mounting tube away from the mounting chamber. A blocking structure is fixedly installed in the center of the inside of the mounting tube.

[0016] When the locking mechanism enters the final locking stage, the guide groove at the end of the squeezing seat precisely contacts and squeezes the squeezing rod. After being compressed, the piston seat overcomes the resistance of the auxiliary spring and performs axial movement in the installation tube (i.e., the installation chamber). The displacement of the piston seat compresses the warning solution pre-filled in the tube under high pressure. When the hydraulic pressure generated by the piston seat reaches the design peak, the driving solution instantly breaks through the obstruction structure inside the pipeline. The solution that breaks through the obstruction quickly fills the baffle, which is convenient for staff to check in real time and ensure that the locking mechanism is locked in place. It should be noted that, in order to facilitate clearer and more precise observation of changes at the baffle, the contact surface between the baffle and the solution is uniformly coated with a highly dispersed ferric salt dry film. The solution can be a low-concentration potassium thiocyanate solution. Upon contact between the two substances, a blood-red ferric thiocyanate complex is instantly formed, causing the baffle to change from transparent or light-colored to a deep blood-red color in an instant. The resulting complex is chemically very stable, and even several days after the locking is completed, the color remains vibrant, facilitating easy review by management personnel.

[0017] Furthermore, the mounting chamber and the piston seat are fitted with an irregular cross-section to form a circumferential limiting structure. The inner cavity of the mounting chamber is elliptical, and the outer contour of the piston seat is elliptical.

[0018] The elliptical cross-section has unequal lengths of its major and minor axes and is non-circularly symmetrical. Its irregular shape fits between the piston seat and the mounting chamber to form a rigid circumferential limit. During vibration or high-pressure hydraulic feedback at the assembly node, it effectively prevents the piston seat from rotating. This ensures that the pressure surface at the front end of the piston seat always maintains a preset alignment angle with the pressing rod at the end of the locking mechanism, avoiding "trigger failure" or "mechanical jamming" caused by the rotation of parts, and achieving accuracy in locking action and monitoring signals.

[0019] Furthermore, the end of the extrusion rod is stepped, and the guide groove is segmented, consisting of a gentle guide section and a raised locking section.

[0020] The smooth guide section provides a gentle guiding phase, while the raised locking section, combined with the stepped end, forms a physical "cliff-like" abrupt change point. During the first 99% of the locking mechanism's extension, the compression rod only slides or slightly moves within the smooth guide section. At this time, the piston seat is not subjected to pressure sufficient to break through the obstruction structure, and the self-checking mechanism remains silent, isolating the "gradually ambiguous signal" in the semi-locked state. Only when the locking mechanism reaches 100% of the preset lock position does the stepped end instantly straddle the raised locking section, resulting in a sudden displacement change. This allows for rapid and stable signal transmission, avoiding false alarms during high-altitude operations. When the stepped end of the compression rod violently impacts and slides onto the raised locking section of the guide groove, it instantly applies a pressure to the piston seat. The massive transient high-pressure pulse, releasing this high-frequency transient hydraulic potential energy, can drive the solution to break through the obstruction structure with extremely high kinetic energy, ensuring that the solution instantly covers the chemical coating surface of the baffle in a jet-like manner. This guarantees the uniformity and speed of the chemical color reaction and the timeliness of signal feedback. The segmented design separates the "locking action" and the "detection action" in spatial trajectory, ensuring that the self-checking mechanism will not intervene prematurely or consume driving force when the locking mechanism is performing the locking action. Only after the extrusion seat is fully wedged in and completes expansion and locking does the protruding locking section begin to provide feedback, following the "lock first, then feedback" timing control mechanism, avoiding interference between mechanical actions and greatly improving the reliability and smoothness of the entire assembly node connection process.

[0021] Furthermore, the blocking structure includes a mounting base fixedly installed inside the mounting tube, a connecting column rotatably connected to the bottom end of the mounting base, a swing plate fixedly installed on the connecting column, and a limiting structure provided at both ends of the connecting column.

[0022] In the early stage before the locking mechanism is fully locked (i.e., when the extrusion rod slides along the gentle guide section of the guide groove), the piston seat only produces a slight volume displacement. At this time, the blocking structure maintains a rigid locking state, forming a physical interception of the solution inside the installation tube, cutting off the premature contact path between the warning solution and the baffle, avoiding signal mistransmission and premature color development caused by construction vibration, environmental temperature difference, or "semi-locked" state, and improving the anti-interference stability of the device. When the extrusion rod instantly enters the protruding locking section of the guide groove, the piston seat will change the mechanical displacement into a transient high-pressure liquid pulse. With the sudden increase in pressure, the swing plate instantly overcomes the mechanical resistance threshold set by the limiting structure attached to the connecting column. With the yielding of the limiting structure, the swing plate quickly flips, and the originally closed pipeline channel is instantly opened up. The pressurized solution can be smoothly and at high speed sprayed out, directly washing and wetting the chemical response coating on the surface of the baffle. The two instantly undergo a chemical color change reaction, producing a high-contrast visual change. By observing this irreversible chemical color signal, the staff can determine that the locking mechanism has been locked.

[0023] Furthermore, the limiting structure includes protrusions fixedly installed at both ends of the connecting column, and a stop block is provided on one side of both ends of the connecting column, and the stop block and the protrusion are pressed together.

[0024] The "squeezing fit" between the protrusion and the stop forms a rigid physical resistance wall. Only when the rotational torque generated by the solution pressure on the swing plate is greater than the maximum static friction and deformation resistance between the protrusion and the stop can the connecting column deflect. This sets an absolute and precise "critical opening pressure" for the self-testing mechanism. In the early sliding stage of the smooth guide section, the low-pressure disturbance caused by small volume changes or thermal expansion and contraction in the tube cannot overcome this resistance. This effectively prevents the solution from slowly "leaking prematurely" before it is completely locked, ensuring the uniqueness and accuracy of the trigger signal.

[0025] The present invention also provides a construction method for prefabricated steel-concrete composite column-column connection nodes, including: Step 1: Lifting Preparation and Non-directional Guidance When it is necessary to connect the upper and lower columns, the upper column is transported to the top of the lower column by the lifting device and slowly lowered. During the lowering process, the conical guide block set at the bottom of the upper column automatically slides into the conical guide groove at the top of the lower column. The sliding friction of the conical inclined surface realizes the initial guidance and automatic correction of the spatial posture, thereby achieving coarse guidance. Since the upper and lower columns are not connected by bolts, non-directional access in the whole circumference is realized. During the construction process, there is no need to make precise angle adjustments for specific bolt hole positions, which greatly shortens the operation time of high-altitude lifting. Step Two: Gravity Drive and Three-Way Locking As the upper column continues to settle under gravity, the device enters the automatic locking stage. The self-weight of the upper column drives the locking mechanism to unfold, and the extrusion column is subjected to force, applying axial driving force to the extrusion seat, causing its end to precisely wedge into the internal mating groove of the guide block at the bottom of the upper column. As the extrusion seat continues to wedge in, the extrusion groove at its end interferes with the limiting ring inside the guide block, generating a lateral expansion force using the difference in geometric slope, inducing elastic expansion at the end of the extrusion seat. Simultaneously with the expansion action at the end of the extrusion seat, the corresponding features of the guide hook groove and the mating groove inside the guide block form a mechanical engagement and embedded abutment. The device, through a single horizontal linear drive, simultaneously completes the three-way locking mechanism of axial limiting, radial pressing, and circumferential locking. Step 3: Hydraulic self-inspection closed loop and visual confirmation. At the end of the final locking stroke of the locking mechanism, the self-inspection mechanism is triggered to enter the working state. The guide groove at the end of the extrusion seat accurately contacts and extrudes the extrusion rod. After the piston seat is compressed, it moves axially in the installation tube, compressing the warning solution pre-filled in the tube under high pressure. When the hydraulic pressure reaches the design peak, the swing plate instantly overcomes the mechanical resistance threshold set by the limiting structure attached to the connecting column. The swing plate quickly flips, and the pipeline channel is instantly opened. The pressurized solution that breaks through the obstruction is quickly, smoothly and at high speed sprayed out, filling the baffle. The solution directly washes and wets the chemical response coating on the surface of the baffle. The two instantly undergo a chemical color change reaction, producing a high-contrast visual change. By observing this irreversible chemical color signal, the staff can intuitively confirm that the locking mechanism has been deployed to the preset locking position, ensuring the safety and reliability of the connection work.

[0026] The technical solution provided by this invention may include the following beneficial effects: In this example, the present invention provides a large margin of error in the initial stage of insertion by wedging the tapered guide groove and the tapered guide block together, which solves the problem of alignment difficulty caused by slight shaking during high-altitude hoisting. It achieves non-directional access in all directions, and workers can achieve "blind insertion" for rapid docking without having to make tedious angle adjustments for specific bolt hole positions. This shortens the operation time of high-altitude hoisting, reduces shift costs and safety risks, and truly achieves ultra-fast assembly. In addition, the tapered surface can smoothly transfer loads, effectively alleviate stress concentration at the connection edge, and extend the fatigue life of the joint. In this example, the present invention can convert axial compressive force into lateral expansion force by using the geometric slope difference between the limiting ring and the V-shaped extrusion groove in the locking mechanism. This induces elastic expansion at the end of the extrusion seat, completely eliminating loosening of the connection interface in the circumferential dimension. At the same time, in conjunction with the mechanical engagement formed by the guide hook grooves on the upper and lower surfaces of the extrusion seat, the device can simultaneously complete the three-way locking of axial limiting, radial pressing and circumferential locking through a single horizontal linear drive. This causes the node to enter a physically locked state, eliminating the sudden change in stiffness of the assembled node at the moment of connection and greatly improving the overall stability of the column under stress. In this example, the self-testing mechanism of the present invention adopts a segmented guide groove design (a smooth guide section and a raised locking section), combined with a blocking structure composed of protrusions and blocks, to set an absolute and precise critical opening pressure for the system. During the first 99% of the travel of the locking mechanism, the self-testing mechanism remains silent, physically intercepting the premature leakage of the solution, effectively isolating the low-pressure disturbance caused by vibration and environmental temperature difference and the "gradual fuzzy signal" in the semi-locked state. The device strictly follows the timing logic of "locking first, then feedback", avoiding interference between mechanical actions, and greatly improving the uniqueness, accuracy and smoothness of the connection process of the feedback signal. In this example, at the end of the final locking stroke of the locking mechanism of the present invention, the piston seat abruptly transforms the mechanical displacement into a transient high-pressure liquid flow pulse. The warning solution in the drive tube instantly breaks through the obstruction structure. After the solution (such as a low-concentration potassium thiocyanate solution) wets the coating (such as a dry film of ferric salt) on the surface of the baffle, a chemical reaction occurs instantaneously, generating a blood-red ferric thiocyanate complex. This produces a visually striking abrupt change with extremely high contrast. The irreversible chemical color signal allows workers to intuitively and accurately determine that the locking mechanism has been fully engaged, completely eliminating the blindness of concealed works. Furthermore, because the chemical properties of the complex generated by the reaction are extremely stable, its bright color can be maintained for several days, facilitating subsequent quality checks by management personnel.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the connection structure between the upper and lower columns of the present invention; Figure 2 This is a schematic diagram of the upper and lower column separation structure of the present invention; Figure 3 This is a partial half-section diagram of the connection between the upper and lower columns of the present invention; Figure 4 This is a partial structural diagram of the locking mechanism of the present invention; Figure 5 This is a schematic diagram of the limiting ring structure of the present invention; Figure 6 This is a schematic diagram of the extrusion seat structure of the present invention; Figure 7 This is a schematic diagram of the self-testing mechanism of the present invention; Figure 8 This is a schematic diagram of the piston seat and extrusion rod structure of the present invention; Figure 9 This is a schematic diagram of the blocking structure of the present invention.

[0030] In the diagram: 1. Upper column; 2. Lower column; 3. Guide groove; 4. Guide block; 5. Locking mechanism; 6. Self-inspection mechanism; 7. Fixed seat; 8. Mounting groove; 9. Restricting spring; 10. Extrusion seat; 11. Extrusion column; 12. Restricting ring; 13. Extrusion groove; 14. Mating inclined surface; 15. Guide hook groove; 16. Mounting tube; 17. Mounting chamber; 18. Piston seat; 19. Auxiliary spring; 20. Extrusion rod; 21. Guide groove; 22. Baffle; 23. Mounting seat; 24. Swing plate; 25. Connecting column; 26. Stop block. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention. Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the invention more thorough and complete, and to fully convey the scope of the invention to those skilled in the art.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] The technical solution of the present invention (Embodiment 1) is described in detail below with reference to the accompanying drawings.

[0035] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The prefabricated steel-concrete composite column-column connection node specifically includes: an upper column 1, a lower column 2 below the upper column 1, a guide block 4 fixedly installed at the center of the bottom end of the upper column 1, a guide groove 3 opened at the top end of the lower column 2, and the guide groove 3 and the guide block 4 are in a pressing fit, a locking mechanism 5 fixedly installed at the top end of the lower column 2, and the locking mechanism 5 and the guide block 4 are in a pressing fit, and several self-inspection mechanisms 6 are installed in a ring shape inside the bottom end of the upper column 1 and the lower column 2, and the self-inspection mechanisms 6 and the locking mechanism 5 are in a pressing fit; the locking mechanism 5 includes a fixed seat 7 fixedly installed at the top end of the lower column 2, several installation grooves 8 are opened at equal intervals on the fixed seat 7, a pressing seat 10 is slidably connected inside the installation groove 8, a limiting spring 9 is installed at the bottom end of the pressing seat 10, and the limiting spring 9 and the fixed seat 7 are in a fit, the pressing seat 10 and the guide block 4 are in an insertion fit, and the guide block 4 has a fitting groove that is in a pressing fit with the pressing seat 10.

[0036] The specific working process for connecting the upper column 1 and the lower column 2 is as follows: When docking is required between the upper column 1 and the lower column 2, the upper column 1 is transported to directly above the lower column 2 using a hoisting device and slowly lowered. During the lowering process, the conical guide block 4 located at the bottom of the upper column 1 automatically slides into the conical guide groove 3 at the top of the lower column 2. The sliding friction of the conical inclined surface achieves initial guidance and automatic correction of spatial posture, thereby achieving coarse guidance and ensuring the efficiency of the docking process. Furthermore, the upper column 1 and the lower column 2 are not connected by bolts, achieving non-directional access in all circumferences. During construction, there is no need for precise angle adjustments to specific bolt hole positions, greatly shortening the operation time for high-altitude hoisting and enhancing the ease of docking of the device. As the upper column 1 continues to settle under the action of gravity, the device enters the automatic locking stage. The self-weight load of the upper column 1 drives the locking mechanism 5 to unfold, and the locking mechanism 5 realizes the locking connection between the upper column 1 and the lower column 2. At the end of the final locking stroke of the locking mechanism 5, the self-inspection mechanism 6 is triggered to enter the working state. The self-inspection mechanism 6 adopts a visual feedback form so that the staff can intuitively confirm that the locking mechanism 5 has unfolded to the preset locking position. Through the cooperation of the locking mechanism 5 and the self-inspection mechanism 6, the locking connection between the upper column 1 and the lower column 2 can be completed, and it can be intuitively observed whether the device is locked, ensuring the safety and reliability of the connection work.

[0037] See Figure 2 and Figure 5 Specifically, the guide groove 3 has a tapered guide surface that tapers along its insertion direction, and the guide block 4 has a tapered outer wall that matches the shape of the tapered guide surface; the guide block 4 fits into the guide groove 3 and forms a wedge-tight contact with the tapered guide surface.

[0038] Relying on the "gradual contraction" characteristic of guide groove 3 and the "adaptive cone" shape of guide block 4, a large margin of error is provided in the initial stage of insertion. As the upper column 1 falls, the contact force between the cone surfaces forcibly transforms the irregular eccentric displacement into a centering force pointing towards the axis. This not only solves the problem of alignment difficulty caused by slight swaying during high-altitude hoisting, but also ensures that the upper column 1 and lower column 2 are in a precise coaxial state before the locking mechanism 5 is activated, facilitating subsequent work and deployment of the device. The cone-shaped guide surface is a fully circumferentially symmetrical (or multi-symmetrical) structure. Combined with the boltless design, workers do not need to perform tedious rotation of the upper column 1 at high altitudes during hoisting. The angle adjustment (i.e., the "hole finding" process) allows for "blind insertion" rapid docking as long as the upper column 1 is roughly above the lower column 2. This improvement greatly reduces the daily operating cost of hoisting equipment and the safety risks of high-altitude operations, achieving the "rapid assembly" pursued by prefabricated buildings. The conical contact transforms point or line contact into surface contact. When bearing longitudinal axial force, the tapered conical surface shares part of the vertical load and transforms it into radial pressure, making the force transmission at the connection interface smoother. This effectively alleviates the stress concentration phenomenon of the steel pipe column wall at the connection edge and helps to extend the fatigue life of the joint.

[0039] See Figure 5 and Figure 6 Specifically, the locking mechanism 5 also includes a limiting ring 12 fixedly installed inside the mating groove of the guide block 4. One end of the pressing seat 10 is provided with a pressing groove 13 that presses against the limiting ring 12. The end of the pressing seat 10 away from the pressing groove 13 is provided with a mating inclined surface 14 that presses against the pressing seat 10. The upper and lower surfaces of the pressing seat 10 are fixedly installed with guide hook grooves 15, and the guide hook grooves 15 press against the mating groove inside the guide block 4.

[0040] The extrusion column 11 is subjected to force and applies an axial driving force to the extrusion seat 10. Guided by this force, the extrusion seat 10 performs a high-precision linear displacement along the preset mounting groove 8, so that its end is precisely wedged into the internal mating groove of the guide block 4 at the bottom of the upper column 1. This step initially limits the relative displacement of the connecting node in the radial direction. As the extrusion seat 10 continues to wed in, the extrusion groove 13 at its end interferes with the limiting ring 12 inside the guide block 4. Utilizing the geometric slope difference between the limiting ring 12 and the V-shaped extrusion groove 13, a strong lateral expansion force is generated, inducing the end of the extrusion seat 10 to elastically expand. This expansion mechanism changes the "sliding gap" between the outer wall of the extrusion seat 10 and the inner surface of the mating groove into a "sliding gap". "High-pressure surface contact" completely eliminates the loosening of the connection interface in the circumferential (rotational) dimension through this frictional self-locking, ensuring the stability of the column under torsional load. In order to further anchor the axial degree of freedom and prevent the upper column 1 from coming off, while the expansion action is performed at the end of the extrusion seat 10, the corresponding features of the guide hook groove 15 and the internal mating groove of the guide block 4 form a mechanical engagement and embedded abutment. This "guide hook-groove" extrusion engagement makes the node enter a physical locking state. The device completes the three-way locking form of axial limiting, radial pressing and circumferential locking simultaneously through a single horizontal linear drive. This not only increases the connection fit, but also eliminates the sudden change in stiffness of the assembled node at the moment of connection through mechanical interference.

[0041] It should be noted that in order to achieve a strong engagement between the guide hook groove 15 and the mating groove, the inner wall of the mating groove is provided with a force-bearing bevel, the slope direction of which is opposite to the direction of the hook part of the guide hook groove 15. When the extrusion seat 10 expands, the guide hook groove 15 is not only compressed in the radial direction, but its hook-shaped tip will also have a tendency to "tighten as it is pulled" along the slope of the mating groove. This slope engagement converts the radial expansion force into the axial pull-out force.

[0042] See Figure 5 and Figure 6 Specifically, the inner radial protrusion of the limiting ring 12 forms a triangular positioning part, and the extrusion groove 13 has a V-shaped groove structure with the opening facing the triangular positioning part, and the edge of the triangular positioning part is embedded in the V-shaped groove.

[0043] The "edge" of the triangular positioning part has a line contact characteristic, while the converging V-groove provides an effective guiding slope. Compared to the extrusion of a flat surface, the edge embedded in the V-groove can generate extremely high local contact pressure. This allows the locking mechanism 5 to quickly penetrate surface rust or machining burrs at the moment of triggering, achieving instantaneous engagement. This greatly shortens the time from "initial contact" to "complete locking," improving the sensitivity of the self-locking action. The converging structure of the V-groove has a centering and closing characteristic. During the forward sliding of the extrusion seat 10, if the position shifts slightly, the edge of the triangular positioning part will follow the V-groove... The inclined surface of the groove automatically slides towards the center of the groove bottom. This self-correcting function ensures that all extrusion seats 10 can act synchronously and symmetrically on the upper column 1, avoiding uneven force on the node caused by eccentric extrusion, and ensuring the verticality of the upper column 1 and the lower column 2 after connection. When the triangular edge is deeply wedged into the constricted V-groove, it will generate a huge radial component force due to the reaction force of the inclined surfaces on both sides of the V-groove. This efficiently converts the axial extrusion force into an outward expansion force, allowing the end of the extrusion seat 10 to generate a large radial displacement with a small thrust, thereby forming an ultra-tight interference fit with the mating groove inside the guide block 4.

[0044] See Figure 7 , Figure 8 and Figure 9 Specifically, the self-inspection mechanism 6 includes an installation tube 16 that is equidistantly fixedly installed at the bottom of the upper column 1 and the lower column 2. An installation chamber 17 is opened at the end of the installation tube 16 near the guide block 4. A piston seat 18 is slidably connected inside the installation chamber 17. An auxiliary spring 19 is installed inside the installation chamber 17, and the auxiliary spring 19 and the piston seat 18 are in a compression fit. A compression rod 20 is fixedly installed at the end of the piston seat 18 away from the auxiliary spring 19. A guide groove 21 that is in a compression fit with the compression rod 20 is opened at the end of the compression seat 10. A baffle 22 is fixedly installed at the end of the installation tube 16 away from the installation chamber 17. A blocking structure is fixedly installed in the center of the interior of the installation tube 16.

[0045] When the locking mechanism 5 enters the end locking stage, the guide groove 21 at the end of the squeezing seat 10 accurately contacts and squeezes the squeezing rod 20. After being compressed, the piston seat 18 overcomes the resistance of the auxiliary spring 19 and performs axial movement in the installation tube 16 (i.e., the installation chamber 17). The displacement of the piston seat 18 compresses the warning solution pre-filled in the tube under high pressure. When the hydraulic pressure generated by the piston seat 18 reaches the design peak value, the driving solution instantly breaks through the blocking structure inside the pipeline. The solution that breaks through the barrier quickly fills the baffle 22, which is convenient for the staff to check in real time and ensure that the locking mechanism 5 is locked in place. It should be noted that, in order to facilitate staff to more clearly and precisely observe the changes at the baffle 22, the contact surface between the baffle 22 and the solution is uniformly coated with a highly dispersed ferric salt such as ferric chloride dry film. The solution can be a low-concentration potassium thiocyanate solution. After the two substances come into contact, a blood-red ferric thiocyanate complex is instantly generated, causing the baffle 22 to change from transparent or light-colored to deep blood-red in an instant. The resulting complex is chemically very stable, and even several days after the locking is completed, the color can still remain bright, making it convenient for managers to check at any time.

[0046] See Figure 8 Specifically, the mounting chamber 17 and the piston seat 18 form a circumferential limiting structure through a non-circular cross-section fit. The inner cavity of the mounting chamber 17 is elliptical, and the outer contour of the piston seat 18 is elliptical.

[0047] The elliptical cross-section has unequal lengths of its major and minor axes and is non-circularly symmetrical. Its irregular shape fits between the piston seat 18 and the mounting chamber 17 to form a rigid circumferential limit. During vibration or high-pressure hydraulic feedback of the assembly node, it effectively prevents the piston seat 18 from rotating. This ensures that the pressure surface at the front end of the piston seat 18 always maintains a preset alignment angle with the pressing rod 20 at the end of the locking mechanism 5, avoiding "trigger failure" or "mechanical jamming" caused by the rotation of parts, and achieving the accuracy of locking action and monitoring signal.

[0048] See Figure 8 Specifically, the end of the extrusion rod 20 is stepped, and the guide groove 21 is segmented, consisting of a gentle guide section and a raised locking section.

[0049] The smooth guide section provides a smooth guiding phase, while the raised locking section combined with the stepped end forms a physical "cliff-like" abrupt change point. During the first 99% of the stroke of the locking mechanism 5, the pressing rod 20 only slides or slightly moves within the smooth guide section. At this time, the piston seat 18 is not subjected to pressure sufficient to break through the blocking structure, and the self-testing mechanism 6 remains silent, which can isolate the "gradually ambiguous signal" in the semi-locked state. Only when the locking mechanism 5 reaches 100% of the preset lock position will the stepped end instantly straddle the raised locking section, resulting in a displacement change. This allows for rapid and stable signal transmission, avoiding false alarms during high-altitude operations. When the stepped end of the pressing rod 20 violently impacts and slides onto the raised locking section of the guide groove 21, it will instantly impact the piston seat 18. Applying a huge transient high-pressure pulse, this high-frequency transient hydraulic potential energy release can drive the solution to break through the blocking structure with extremely high kinetic energy, ensuring that the solution instantly covers the chemical coating surface of the baffle 22 in a spray pattern. This ensures the uniformity and speed of the chemical color reaction and the timeliness of signal feedback. The segmented design separates the "locking action" and the "detection action" in the spatial trajectory, ensuring that when the locking mechanism 5 is performing the locking action, the self-testing mechanism 6 will not intervene prematurely or consume driving force. Only when the extrusion seat 10 is fully wedged in and completes expansion and locking does the protruding locking section begin to provide feedback. Following the timing control mechanism of "locking first, then feedback", interference between mechanical actions is avoided, which greatly improves the reliability and smoothness of the entire assembly node connection process.

[0050] See Figure 9 Specifically, the blocking structure includes a mounting base 23 fixedly installed inside the mounting tube 16, a connecting column 25 rotatably connected to the bottom end of the mounting base 23, a swing plate 24 fixedly installed on the connecting column 25, and a limiting structure provided at both ends of the connecting column 25.

[0051] In the early stage before the locking mechanism 5 is fully locked (i.e., when the extrusion rod 20 slides along the gentle guide section of the guide groove 21), the piston seat 18 only produces a slight volume displacement. At this time, the blocking structure maintains a rigid locking state, forming a physical interception of the solution inside the installation tube 16, cutting off the premature contact path between the warning solution and the baffle 22, avoiding signal mistransmission and premature color development caused by construction vibration, environmental temperature difference, or "semi-locked" state, and improving the anti-interference stability of the device. When the extrusion rod 20 instantly crosses into the protruding locking section of the guide groove 21, the piston seat 18 will suddenly undergo mechanical displacement. The pressure surges rapidly, causing the oscillating plate 24 to instantly overcome the mechanical resistance threshold set by the limiting structure attached to the connecting column 25. As the limiting structure yields, the oscillating plate 24 quickly flips over, and the originally closed pipeline channel is instantly opened up, allowing the pressurized solution to be ejected smoothly and at high speed, directly scouring and wetting the chemical response coating on the surface of the baffle 22. The two react instantly with a chemical color change, producing a high-contrast visual change. By observing this irreversible chemical color signal, the staff can determine that the locking mechanism 5 has locked.

[0052] See Figure 9 Specifically, the limiting structure includes protrusions fixedly installed at both ends of the connecting post 25, and a stop block 26 is provided on one side of both ends of the connecting post 25, and the stop block 26 is in a pressing fit with the protrusion.

[0053] The "squeezing fit" between the protrusion and the stop 26 forms a rigid physical resistance wall. Only when the rotational torque generated by the solution pressure on the swing plate 24 is greater than the maximum static friction and deformation resistance between the protrusion and the stop 26 can the connecting column 25 deflect. This sets an absolute and precise "critical opening pressure" for the self-testing mechanism 6. In the early sliding stage of the smooth guide section of the squeezing rod 20, the low-pressure disturbance caused by the small volume change or thermal expansion and contraction in the tube cannot overcome this resistance. This effectively prevents the solution from slowly "leaking prematurely" before it is completely locked, ensuring the uniqueness and accuracy of the trigger signal.

[0054] The present invention also provides a construction method for prefabricated steel-concrete composite column-column connection nodes, including: Step 1: Lifting Preparation and Non-directional Guidance When it is necessary to connect the upper column 1 and the lower column 2, the upper column 1 is transported to the top of the lower column 2 by the lifting device and slowly lowered. During the lowering process, the conical guide block 4 set at the bottom of the upper column 1 automatically slides into the conical guide groove 3 at the top of the lower column 2. The sliding friction of the conical inclined surface realizes the initial guidance and automatic correction of the spatial posture, thereby achieving coarse guidance. Since the upper column 1 and the lower column 2 are not connected by bolts, non-directional access in the whole circumference is realized. During the construction process, there is no need to make precise angle adjustments for specific bolt hole positions, which greatly shortens the operation time of high-altitude lifting. Step 2: Gravity Drive and Three-Way Locking As the upper column 1 continues to sink under the action of gravity, the device enters the automatic locking stage. The self-weight load of the upper column 1 drives the locking mechanism 5 to unfold. The extrusion column 11 is subjected to force and applies axial driving force to the extrusion seat 10, so that its end is precisely wedged into the internal mating groove of the guide block 4 at the bottom of the upper column 1. As the extrusion seat 10 continues to wed in, the extrusion groove 13 opened at its end interferes with the limiting ring 12 inside the guide block 4. The difference in geometric slope generates a lateral expansion force, inducing the end of the extrusion seat 10 to expand elastically. At the same time as the end of the extrusion seat 10 performs the expansion action, the corresponding features of the guide hook groove 15 and the mating groove inside the guide block 4 form a mechanical engagement and embedded abutment. The device completes the three-way locking form of axial limiting, radial pressing and circumferential locking simultaneously through a single horizontal linear drive. Step 3: Hydraulic self-inspection closed loop and visual confirmation. At the end of the final locking stroke of the locking mechanism 5, the self-inspection mechanism 6 is simultaneously triggered to enter the working state. The guide groove 21 set at the end of the extrusion seat 10 accurately touches and extrudes the extrusion rod 20. After being compressed, the piston seat 18 performs axial movement in the installation tube 16, compressing the warning solution pre-filled in the tube under high pressure. When the hydraulic pressure reaches the design peak, the swing plate 24 instantly overcomes the mechanical resistance threshold set by the limiting structure attached to the connecting column 25. The swing plate 24 quickly flips, and the pipeline channel is instantly opened. The pressurized solution that breaks through the obstruction is quickly, smoothly and at high speed sprayed out, filling the baffle 22. The solution directly washes and wets the chemical response coating on the surface of the baffle 22. The two instantly undergo a chemical color change reaction, producing a high-contrast visual change. By observing this irreversible chemical color signal, the staff can intuitively confirm that the locking mechanism 5 has been deployed to the preset locking position, ensuring the safety and reliability of the connection work.

[0055] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the embodiments of the present invention can be adjusted, combined, and deleted according to actual needs, and the structure in the device of the embodiments of the present invention can be combined, divided, and deleted according to actual needs.

[0056] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A prefabricated steel-concrete composite column-column connection node, characterized in that, include: An upper column (1) is provided below the upper column (1) and a lower column (2) is provided below the upper column (1). A guide block (4) is fixedly installed at the center of the bottom end of the upper column (1). A guide groove (3) is opened at the top end of the lower column (2) and the guide groove (3) and the guide block (4) are squeezed together. A locking mechanism (5) is fixedly installed at the top end of the lower column (2) and the locking mechanism (5) is squeezed together with the guide block (4). Several self-inspection mechanisms (6) are installed in a ring inside the bottom end of the upper column (1) and the lower column (2) and the self-inspection mechanism (6) and the locking mechanism (5) are squeezed together. The locking mechanism (5) includes a fixed seat (7) fixedly installed at the top of the lower column (2). The fixed seat (7) has several mounting slots (8) equidistantly provided. A pressing seat (10) is slidably connected inside the mounting slot (8). A limiting spring (9) is installed at the bottom of the pressing seat (10), and the limiting spring (9) cooperates with the fixed seat (7). The pressing seat (10) is inserted into the guide block (4), and the guide block (4) has a mating slot that is pressed into the pressing seat (10).

2. The prefabricated steel-concrete composite column-column connection node according to claim 1, characterized in that: The guide groove (3) has a tapered guide surface that tapers along its insertion direction, and the guide block (4) has a tapered outer wall that matches the shape of the tapered guide surface; the guide block (4) fits into the guide groove (3) and forms a wedge-tight contact with the tapered guide surface.

3. The prefabricated steel-concrete composite column-column connection node according to claim 2, characterized in that: The locking mechanism (5) further includes a limiting ring (12) fixedly installed inside the mating groove of the guide block (4). One end of the pressing seat (10) is provided with a pressing groove (13) that presses against the limiting ring (12). The end of the pressing seat (10) away from the pressing groove (13) is provided with a mating inclined surface (14) that presses against the pressing seat (10). The upper and lower surfaces of the pressing seat (10) are fixedly installed with guide hook grooves (15), and the guide hook grooves (15) press against the mating groove inside the guide block (4).

4. The prefabricated steel-concrete composite column-column connection node according to claim 3, characterized in that: The inner radial protrusion of the limiting ring (12) forms a triangular positioning part, and the extrusion groove (13) has a V-shaped groove structure with the opening facing the triangular positioning part, and the edge of the triangular positioning part is embedded in the V-shaped groove.

5. A prefabricated steel-concrete composite column-column connection node according to claim 4, characterized in that: The self-testing mechanism (6) includes an installation tube (16) that is fixedly installed at equal intervals inside the bottom of the upper column (1) and the lower column (2). The end of the installation tube (16) near the guide block (4) is provided with an installation chamber (17). A piston seat (18) is slidably connected inside the installation chamber (17). An auxiliary spring (19) is installed inside the installation chamber (17), and the auxiliary spring (19) and the piston seat (18) are in a compression fit. A compression rod (20) is fixedly installed at the end of the piston seat (18) away from the auxiliary spring (19). A guide groove (21) that is in a compression fit with the compression rod (20) is provided at the end of the compression seat (10). A baffle (22) is fixedly installed at the end of the installation tube (16) away from the installation chamber (17). A blocking structure is fixedly installed in the center of the interior of the installation tube (16).

6. A prefabricated steel-concrete composite column-column connection node according to claim 5, characterized in that: The mounting chamber (17) and the piston seat (18) are fitted together by an irregular cross section to form a circumferential limiting structure. The inner cavity of the mounting chamber (17) is elliptical, and the outer contour of the piston seat (18) is elliptical.

7. A prefabricated steel-concrete composite column-column connection node according to claim 6, characterized in that: The end of the extrusion rod (20) is stepped, and the guide groove (21) is segmented, consisting of a gentle guide section and a raised locking section.

8. A prefabricated steel-concrete composite column-column connection node according to claim 7, characterized in that: The blocking structure includes a mounting base (23) fixedly installed inside the mounting tube (16), a connecting column (25) rotatably connected to the bottom end of the mounting base (23), a swing plate (24) fixedly installed on the connecting column (25), and a limiting structure provided at both ends of the connecting column (25).

9. A prefabricated steel-concrete composite column-column connection node according to claim 8, characterized in that: The limiting structure includes protrusions fixedly installed at both ends of the connecting column (25), and a stop block (26) is provided on one side of both ends of the connecting column (25), and the stop block (26) is pressed and engaged with the protrusion.

10. A construction method for a prefabricated steel-concrete composite column-column connection joint, applicable to the prefabricated steel-concrete composite column-column connection joint described in any one of 1-9 above, characterized in that, include: Step 1: Lifting preparation and non-directional guidance When it is necessary to connect the upper column (1) and the lower column (2), the upper column (1) is transported to the top of the lower column (2) by the lifting device and slowly lowered. During the lowering process, the conical guide block (4) set at the bottom of the upper column (1) automatically slides into the conical guide groove (3) at the top of the lower column (2). The sliding friction of the conical inclined surface is used to realize the initial guidance and automatic correction of the spatial posture, thereby achieving coarse guidance. Since the upper column (1) and the lower column (2) are not connected by bolts, non-directional access in the whole circumference is realized. During the construction process, there is no need to make precise angle adjustments for specific bolt hole positions, which greatly shortens the operation time of high-altitude lifting. Step 2: Gravity drive and three-way locking As the upper column (1) continues to sink under the action of gravity, the device enters the automatic locking stage. The self-weight load of the upper column (1) drives the locking mechanism (5) to unfold. The extrusion column (11) is subjected to force and applies axial driving force to the extrusion seat (10), so that its end is precisely wedged into the internal mating groove of the guide block (4) at the bottom of the upper column (1). As the extrusion seat (10) continues to wed in, the extrusion groove (13) opened at its end interferes with the limiting ring (12) inside the guide block (4). The difference in geometric slope generates a lateral expansion force, which induces the end of the extrusion seat (10) to expand elastically. While the end of the extrusion seat (10) performs the expansion action, the corresponding features of the guide hook groove (15) and the mating groove inside the guide block (4) form a mechanical engagement and embedded contact. The device completes the three-way locking form of axial limit, radial compression and circumferential locking simultaneously through a single horizontal linear drive. Step 3: Hydraulic self-inspection closed loop and visual confirmation. At the end of the final locking stroke of the locking mechanism (5), the self-inspection mechanism (6) is triggered to enter the working state. The guide groove (21) set at the end of the squeezing seat (10) accurately touches and squeezes the squeezing rod (20). After the piston seat (18) is compressed, it performs axial movement in the installation tube (16) to compress the warning solution pre-filled in the tube under high pressure. When the hydraulic pressure reaches the design peak value, the swing plate (24) instantly overcomes the limiting structure set by the connecting column (25). When the mechanical resistance threshold is reached, the swing plate (24) quickly flips over, and the pipeline channel is instantly opened up. The pressure-accumulated solution that breaks through the obstruction is quickly and smoothly sprayed out at high speed, filling the baffle (22). The solution directly washes and wets the chemical response coating on the surface of the baffle (22). The two undergo a chemical color change reaction instantly, producing a high-contrast visual change. By observing this irreversible chemical color signal, the staff can intuitively confirm that the locking mechanism (5) has been deployed to the preset locking position, ensuring the safety and reliability of the connection work.

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