An ultra-wide structure post-cast strip beam steel extrusion sleeve connecting joint and a construction method thereof

Abstract

The application discloses a kind of super-wide structure post-cast strip beam steel extrusion sleeve connecting nodes and its construction method, it is related to building construction technical field;And the present application includes beam bottom reinforcement, sectional extrusion sleeve, beam surface reinforcement and beam waist reinforcement, the beam bottom reinforcement, beam surface reinforcement, beam waist reinforcement keep disconnected state before structure post-cast strip is closed, the butt end of beam bottom reinforcement, beam surface reinforcement, beam waist reinforcement are all connected mechanically by sectional extrusion sleeve, and the sectional extrusion sleeve connecting joint of beam bottom reinforcement, beam surface reinforcement, beam waist reinforcement needs staggered arrangement, sectional extrusion sleeve uses sectional extrusion mode, only sectional extrusion sleeve end close to the side of already constructed structure is extruded before post-cast strip is closed, sectional extrusion sleeve end close to the side of not constructed structure is extruded again when post-cast strip satisfies closed condition;The present application is connected by sectional extrusion sleeve by setting sectional extrusion sleeve, and post-cast strip place beam steel uses extrusion sleeve, construction procedure is simple, compared with traditional lap joint, construction period is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a rebar extrusion sleeve connection node for ultra-wide post-cast strip beams and its construction method. Background Technology

[0002] In large-scale cast-in-place concrete structures, the use of ultra-wide post-cast strips is crucial for releasing differential settlement and reducing temperature shrinkage stress. These post-cast strips require a retention period of several weeks or even months, during which the structural units on either side of the strip will undergo relative displacement and deformation. However, the beam reinforcement running through the post-cast strip must ultimately achieve continuous stress transfer, creating an inherent contradiction between the need for free deformation of the structure during the retention period and the requirement for reliable connection of the reinforcement in its final state.

[0003] Currently, for beam reinforcement connections at post-cast strips, engineering projects often employ methods such as pre-reserved lap joints, welding, or one-time connection using ordinary straight threaded sleeves or extrusion sleeves. These methods either involve fully connecting the reinforcement before the post-cast strip is closed, or pre-reserving the ends of the reinforcement for later assembly. During construction, for mechanical connections such as extrusion sleeves, the connection quality mainly relies on the operator's experience, and is controlled by visually inspecting extrusion marks or conducting random checks using simple tools afterward.

[0004] The existing methods described above are insufficient to adequately address the unique challenges posed by the long-term retention of ultra-wide post-cast strips. Pre-completing the rigid connection of the reinforcing bars severely restricts the deformation capacity of the post-cast strip, potentially leading to adverse stresses within the structure. Simply cutting the reinforcing bars completely beforehand poses a risk of misalignment due to accumulated deformation, preventing proper connection. Furthermore, traditional connection techniques and quality control rely on manual judgment, making it impossible to dynamically match and precisely control key process parameters such as extrusion pressure and displacement with real-time conditions. Comprehensive recording and traceability of construction data also contribute to significant dispersion and uncertainty in connection quality. Therefore, a novel node and construction method is urgently needed that balances structural deformation requirements with connection reliability and enables intelligent process control. Summary of the Invention

[0005] In view of the above-mentioned actual situation, this application proposes a steel bar extrusion sleeve connection node for ultra-wide post-cast strip beams and its construction method, in order to solve the contradiction between the structural free deformation requirements and the steel bar reliable connection requirements during the long-term retention of ultra-wide post-cast strips in the prior art, as well as the technical problems of traditional extrusion sleeve connection construction relying on manual experience, inaccurate control of process parameters, and difficulty in real-time monitoring and traceability of quality.

[0006] The present invention adopts the following technical solution: a steel bar extrusion sleeve connection node for ultra-wide structural post-cast strip beam, including beam bottom reinforcement 1, segmented extrusion sleeve 2, beam top reinforcement 3 and beam waist reinforcement 6, wherein the beam bottom reinforcement 1, beam top reinforcement 3 and beam waist reinforcement 6 are set to remain disconnected before the structural post-cast strip is closed, and the segmented extrusion sleeve 2 is respectively sleeved on their connecting ends; The segmented extrusion sleeve 2 is configured to perform staged extrusion to achieve asynchronous mechanical connection with two butt-jointed reinforcing bars; wherein, the segmented extrusion sleeve 2 has a first connecting end and a second connecting end, and is further configured as follows: In the first operating state, its first connecting end is pressed and fixed to a steel bar, while the second connecting end remains in a state where it can move relative to another steel bar or is ready to be connected. In the second operating state, its second connecting end is pressed and fixed to the other steel bar, thereby enabling the two steel bars to achieve an integral mechanical connection through the segmented pressing sleeve 2.

[0007] In some embodiments, within the same connection section, the mechanical joints formed by the bottom reinforcement 1, top reinforcement 3, and web reinforcement 6 of the beam through the segmented extrusion sleeve 2 should be staggered; wherein, the center-to-center distance between adjacent joints is not less than 35 times the diameter of the reinforcement, and the number of joints in any section shall not exceed 50% of the total number of the same type of reinforcement in that section.

[0008] In some embodiments, the end faces of the bottom reinforcement 1, the top reinforcement 3, and the web reinforcement 6 of the beam are processed into flat surfaces, and the perpendicularity deviation of the flat surface relative to the axis of the reinforcement is no more than 2mm.

[0009] In some embodiments, the inner diameter of the segmented extrusion sleeve 2 is configured to form a tight fit with the nominal outer diameter of the corresponding reinforcing bars in the bottom reinforcement 1, top reinforcement 3, or web reinforcement 6 of the beam for extrusion connection.

[0010] In some embodiments, the joint ends of the bottom reinforcement 1, the top reinforcement 3, and the web reinforcement 6 of the beam are rust-removed surfaces; and the ratio of the depth of insertion into the segmented extrusion sleeve 2 to the length of the sleeve is not less than 0.5.

[0011] In some embodiments, the cylindrical wall of the segmented extrusion sleeve 2 is provided with a segmented extrusion marking area, and / or its structure is configured to allow independent subsequent extrusion operations on the other end without affecting the connection strength of the already extruded end.

[0012] Furthermore, this application also discloses a construction method for a steel reinforcement extrusion sleeve connection node based on the aforementioned ultra-wide structural post-cast strip beam, characterized by comprising the following steps: S1. Reservation and pretreatment: When pouring concrete structures on both sides of the post-pouring strip, the bottom reinforcement, top reinforcement and web reinforcement of the beam are reserved in the corresponding area of ​​the post-pouring strip according to the design, and the joint ends of the reinforcement are smoothed. S2. Assemble and establish the first operating state: Place the segmented extrusion sleeve onto the butt joint of the rebar; use a hydraulic extrusion device to perform the first extrusion operation on the first connecting end of the sleeve; the first extrusion operation adopts a closed-loop control based on real-time sensing of extrusion force and displacement dual parameters, so that the first connecting end is fixed to a rebar, while the second connecting end of the sleeve remains relatively movable to another rebar, thereby establishing the first operating state of the segmented extrusion sleeve; S3. Establishing the second operating state: After the post-cast strip meets the closure conditions, a second extrusion operation is performed on the second connecting end of the segmented extrusion sleeve in the first operating state; the second extrusion operation adopts adaptive control that dynamically compensates the reference extrusion pressure based on the real-time collected construction environment temperature, so that the second connecting end is fixedly connected to the other steel bar, thereby enabling all beam steel bars to achieve overall mechanical connection through the segmented extrusion sleeve, and establishing the second operating state; S4. Binding auxiliary reinforcement: After completing step S3, bind the stirrups and auxiliary reinforcement of the beam; S5. Pouring post-cast strip concrete: After completing step S4, pour post-cast strip concrete and cure it.

[0013] Furthermore, a preparation step is included before the extrusion operation in steps S2 and / or S3 begins: S0. System Initialization and Parameter Setting: The integrated pressure displacement sensor and temperature sensor integrated on the extrusion die are zero-point calibrated; the specifications and rebar diameter of the currently used segmented extrusion sleeve are input through the sleeve specification selection module; the control system automatically matches and sets the reference extrusion pressure, target displacement stroke and holding time for this extrusion operation based on the built-in process database; at the same time, the monitoring module that communicates with the control system is initialized.

[0014] Furthermore, the closed-loop control based on real-time sensing of the dual parameters of extrusion pressure and displacement described in step S2 specifically includes: During the extrusion process, the integrated pressure displacement sensor collects the actual extrusion pressure and die displacement in real time; The control module compares the actual extrusion pressure and displacement with the set reference values ​​in real time. When the displacement does not reach the target stroke, the control module automatically extends the extrusion action time until the displacement meets the requirements; The real-time extrusion pressure, displacement, and corresponding sleeve specification information are recorded synchronously and transmitted to the monitoring module.

[0015] Furthermore, the adaptive control described in step S3, which dynamically compensates for the reference extrusion pressure based on the real-time collected construction environment temperature, specifically includes: Before and during the extrusion operation, the temperature sensor continuously collects the ambient temperature and the working temperature of the mold; The control module's built-in algorithm calculates and generates a dynamic pressure compensation coefficient based on the preset benchmark extrusion pressure according to the real-time temperature. The integrated pressure displacement sensor collects the actual extrusion force during the extrusion process; If the actual extrusion pressure deviates from the target pressure range after temperature compensation, the control module immediately calculates the pressure correction amount and sends a command to the hydraulic power unit to adjust the output pressure, thereby realizing real-time feedback and compensation control of the extrusion pressure.

[0016] Furthermore, the extrusion process in steps S2 and / or S3 also includes: Real-time monitoring and feedback steps: The monitoring module integrates and displays the received pressure, displacement, temperature and operating parameters; the deviation analysis algorithm built into the control module continuously analyzes the real-time data stream. If the data is determined to be continuously abnormal, the monitoring module will issue an alarm and prompt intervention; when the extrusion displacement and holding time both reach the set standards, the control module will automatically terminate the extrusion operation and issue a process completion signal through the monitoring module.

[0017] The present application proposes a rebar extrusion sleeve connection node for ultra-wide post-cast strip beams and its construction method, which achieves a reliable asynchronous mechanical connection path for rebars while ensuring effective release of internal forces in the post-cast strip. Through intelligent closed-loop control and digital monitoring of the construction process, the uniformity, stability and traceability of the quality of each extrusion connection are ensured, thereby comprehensively improving the construction reliability, structural safety and long-term durability of ultra-wide post-cast strip beam nodes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure of the steel reinforcement extrusion sleeve connection node of the ultra-wide post-cast strip beam in this invention; Figure 2 This is a top view of the rebar extrusion sleeve connection node of the ultra-wide post-cast strip beam in this invention; Figure 3This is a schematic diagram of the first extrusion structure of the steel reinforcement extrusion sleeve connection node of the ultra-wide post-cast strip beam in this invention; Figure 4 This is a schematic diagram of the second extrusion of the steel reinforcement extrusion sleeve connection node in the ultra-wide post-cast strip beam of the present invention.

[0020] In the diagram: 1. Bottom reinforcement of beam; 2. Segmented extrusion sleeve; 3. Top reinforcement of beam; 4. Stirrups of beam; 5. Concrete beam; 6. Web reinforcement of beam. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: Figures 1 to 4 As shown, this connection node mainly consists of bottom reinforcement 1, top reinforcement 3, web reinforcement 6, and segmented extrusion sleeves 2. Before the structural post-cast strip is closed, the bottom reinforcement 1, top reinforcement 3, and web reinforcement 6 are disconnected in the post-cast strip area, and each reinforcement bar is fitted with a segmented extrusion sleeve 2 at its joint end. To ensure the stress performance of the node and facilitate concrete pouring, all mechanical connection joints formed by the segmented extrusion sleeves 2 should be staggered along the length of the beam.

[0023] In some embodiments, the segmented extrusion sleeve 2 is used to support staged asynchronous extrusion operations. Specifically, each sleeve has a first connecting end and a second connecting end defined along its axial direction. During construction, a first operating state of the sleeve is first established: this stage corresponds to before the closure of the post-cast strip. During operation, the segmented extrusion sleeve 2 is placed over the ends of two reinforcing bars to be connected, and then a hydraulic extrusion device is used to extrude only the first connecting end of the sleeve, firmly fixing it to one reinforcing bar (usually from the side of the constructed structure). At this time, the second connecting end of the sleeve remains unextruded, and the other reinforcing bar inside (from the side of the unconstructed structure) can move freely within a certain range or remain in a position to be connected. This state allows the structures on both sides of the post-cast strip to be free from the constraints of the rigid connection of the reinforcing bars during settlement or shrinkage deformation.

[0024] When the settlement of the structures on both sides of the post-cast strip stabilizes and reaches the design-specified closure conditions, the second stage operation is performed to establish the second operational state: the second connecting end of the segmented extrusion sleeve 2 is extruded to fix it to another reinforcing bar. At this point, the two reinforcing bars are fully mechanically connected through the segmented extrusion sleeve 2, and the joint forms an integral stress state.

[0025] To optimize the quality of concrete pouring and the integrity of the structure, the staggered distance between the joints of the bottom reinforcement 1, the top reinforcement 3, and the web reinforcement 6 of the beam should not be less than 35 times the nominal diameter of the reinforcement, and the number of connected reinforcements in any section should not exceed one-half of the total number of reinforcements in that section.

[0026] Furthermore, the flatness of the end faces of the reinforcing bars at the break points is crucial. To ensure the quality of the extrusion connection, the end faces of the bottom reinforcement 1, top reinforcement 3, and web reinforcement 6 of the beam must be treated, and their flatness deviation should be controlled within a range of no more than 2mm. This provides a foundation for the smooth insertion of the segmented extrusion sleeve 2 and the formation of a uniform and reliable connection after extrusion.

[0027] Through the aforementioned technical solution, this node effectively solves the problem of rebar splicing caused by long-term retention and differential settlement in ultra-wide post-cast strips. Its staged extrusion design avoids the limitations on structural deformation imposed by traditional one-time connection methods, and overcomes the excessive space requirements and rebar waste associated with lap connections. Furthermore, this mechanical connection method eliminates the need to rotate the rebar, simplifying construction operations in densely reinforced areas, thereby improving construction efficiency and quality control. The orderly staggering of joints and the smoothing of end faces further ensure the dense pouring of the post-cast strip concrete and the final structural performance of the beam.

[0028] The segmented extrusion sleeve 2 is a hollow tubular component. Its inner diameter is designed to match the nominal outer diameter of the corresponding reinforcing bars in the bottom reinforcement 1, top reinforcement 3, or web reinforcement 6 of the beam to be connected, aiming to form a tight fit for extrusion connection. This dimensional fit ensures that the sleeve's metal material can flow fully and tightly wrap around the surface of the reinforcing bars during subsequent extrusion deformation, thus establishing the basis for an effective mechanical connection. Selecting a suitable specification avoids inadequate fit due to excessive gaps or installation difficulties due to excessively small gaps. Its fundamental purpose is to optimize the stress distribution of the connection node and improve its final shear and tensile bearing capacity.

[0029] To achieve reliable staged extrusion operations, the staged extrusion sleeve 2 possesses corresponding structural features. In some embodiments, a staged extrusion marking area is provided on the outer surface of its sleeve wall, for example, by engraving different ring marks to indicate the working position and range of the first and second extrusions respectively. This marking provides clear visual guidance for construction operations. A deeper structural design involves configuring the sleeve's material, wall thickness, and geometry to allow for staged, independent extrusion operations. Specifically, its structure ensures that when one end of the sleeve (the first connecting end) is extruded and fixed to a reinforcing bar, the connection strength at that end will not be weakened or damaged when the other end (the second connecting end) is subsequently extruded. This allows for a safe and reliable transition from the "first operating state" to the "second operating state."

[0030] In construction preparation, the treatment of the rebar joint ends is crucial. The joint surfaces of the bottom rebar 1, top rebar 3, and web rebar 6 of the beam must be derusted to remove oxide scale, oil, and other contaminants, exposing the metal substrate. This process ensures that there are no impurities separating the rebar surface from the inner wall of the segmented extrusion sleeve 2, which is a prerequisite for achieving direct metal-to-metal contact and effective force transfer. During installation, the treated rebar end should be inserted into the segmented extrusion sleeve 2 along the axial direction, with an insertion depth of not less than half the length of the sleeve itself. This depth requirement ensures that the rebar has sufficient anchorage length within the sleeve, providing space for the formation of uniform and sufficient bond force after extrusion, thus directly affecting the static and fatigue performance of the connection joint.

[0031] Regarding the extrusion molding process, the segmented extrusion sleeve 2 undergoes staged extrusion using a hydraulic extrusion device. This process utilizes the controllable high pressure generated by the device to drive the extrusion die to apply radial pressure to a designated area on the outer wall of the sleeve, forcing the sleeve material to undergo plastic deformation, thereby tightly engaging the ribs or smooth surface of the internal reinforcing bars. The hydraulic device can provide continuous and stable high extrusion force, and can adapt to the process requirements of different diameter reinforcing bars combined with the sleeve through pressure adjustment, ensuring uniform and reliable connection quality in each extrusion molding. Staged extrusion involves sequentially performing this extrusion process on the pre-determined first and second connection end marking areas on the sleeve, ultimately completing the mechanical connection of the entire node.

[0032] A construction method for a rebar extrusion sleeve connection node of an ultra-wide post-cast beam includes the following steps: S1. Reservation and pretreatment: When pouring concrete structures on both sides of the post-pouring strip, the bottom reinforcement, top reinforcement and web reinforcement of the beam are reserved in the corresponding area of ​​the post-pouring strip according to the design, and the joint ends of the reinforcement are smoothed. S2. Assemble and establish the first operating state: Place the segmented extrusion sleeve onto the butt joint of the rebar; use a hydraulic extrusion device to perform the first extrusion operation on the first connecting end of the sleeve; the first extrusion operation adopts a closed-loop control based on real-time sensing of extrusion force and displacement dual parameters, so that the first connecting end is fixed to a rebar, while the second connecting end of the sleeve remains relatively movable to another rebar, thereby establishing the first operating state of the segmented extrusion sleeve; S3. Establishing the second operating state: After the post-cast strip meets the closure conditions, a second extrusion operation is performed on the second connecting end of the segmented extrusion sleeve in the first operating state; the second extrusion operation adopts adaptive control that dynamically compensates the reference extrusion pressure based on the real-time collected construction environment temperature, so that the second connecting end is fixedly connected to the other steel bar, thereby enabling all beam steel bars to achieve overall mechanical connection through the segmented extrusion sleeve, and establishing the second operating state; S4. Binding auxiliary reinforcement: After completing step S3, bind the stirrups and auxiliary reinforcement of the beam; S5. Pouring post-cast strip concrete: After completing step S4, pour post-cast strip concrete and cure it.

[0033] Working principle: First, during the structural construction stage of pouring the concrete of the beams on both sides of the post-pouring strip, the bottom reinforcement, top reinforcement, and web reinforcement of the beams in the corresponding area of ​​the post-pouring strip are pre-treated. Each reinforcement bar is reserved according to the design calculation length and remains disconnected at the post-pouring strip location. The disconnected ends of the reinforcement bars need to be cut and ground to ensure that the end faces are flush and burr-free, and the reserved length must meet the space requirements for subsequent installation of segmented extrusion sleeves and extrusion operations. Then, the segmented extrusion sleeves are fitted onto the butt joints of the reinforcement bars.

[0034] At this stage, only one end of the segmented extrusion sleeve is extruded. Specifically, a hydraulic extrusion device is used to extrude the end of the sleeve, which is fitted onto the reinforcing bar and is closer to the constructed structure. This extrusion causes plastic deformation at that end of the sleeve, thus firmly securing it to a reinforcing bar. At this point, the segmented extrusion sleeve is in a one-sided connection state, while the other end remains in a loose, unextruded state, allowing the other reinforcing bar inside the sleeve to move axially to a limited extent. This design allows the structures on both sides of the post-cast strip to settle and shrink freely over time without generating excessive restraining internal forces due to the rigid connection of the reinforcing bars.

[0035] After the settlement of the structures on both sides of the post-cast strip has stabilized and meets the closure conditions specified in the design, the second stage of connection operation is carried out. At this time, a second compression is performed on the other end of the segmented compression sleeve that was not previously compressed. This compression causes that end of the sleeve to deform and tighten onto another reinforcing bar, thus creating a tight mechanical engagement between both ends of the segmented compression sleeve and the reinforcing bars. At this point, the previously disconnected bottom reinforcement, top reinforcement, and web reinforcement of the beam are connected into a continuous whole through the segmented compression sleeve, restoring the force transmission path required by the design and forming a complete beam load-bearing system.

[0036] After completing the double-sided extrusion of all segmented extrusion sleeves and passing the acceptance inspection, the stirrups and other auxiliary reinforcing bars of the beam are tied according to the design specifications to ensure that the overall arrangement of the reinforcing bars meets the structural stress requirements. After all the reinforcing bars are tied and pass the concealed works inspection, the concrete for the post-cast strip can be poured. During pouring, it should be ensured that the concrete is vibrated and compacted, and after pouring, it should be fully cured according to regulations to finally complete the overall construction of the ultra-wide post-cast strip beam.

[0037] The specific operation and quality control procedures for the aforementioned hydraulic extrusion equipment are implemented as follows: Before the equipment is put into use, the assembly and debugging of its core components must be completed according to standardized procedures. The integrated pressure displacement sensor, small temperature sensor, and segmented extrusion sleeve specification selection module must be precisely installed on the designated interfaces of the extrusion die, ensuring that each sensor probe is aligned with the force-bearing surface of the die and the contact surface of the sleeve, without any positional misalignment. Simultaneously, the circuit connections and data communication links between the hydraulic power unit, the programmable logic controller control module, and the cloud monitoring module must be established. The equipment's built-in automatic calibration program should be started to perform zero-point calibration on all sensors. After calibration, the specific model of the segmented extrusion sleeve used in the current operation and the diameter of the rebar to be connected should be input through the sleeve specification selection module. Based on the built-in database, the system automatically matches and sets the reference pressure value, extrusion stroke, and holding time for this extrusion operation.

[0038] During operation, temperature sensors continuously collect real-time data on the ambient temperature of the construction site and the working temperature of the mold. If the initial or real-time temperature deviates from the standard operating temperature range, the system will automatically calculate the pressure compensation coefficient and dynamically correct the preset reference pressure value. After the hydraulic power unit starts, it drives the extrusion mold to apply radial pressure to the segmented extrusion sleeve. An integrated pressure-displacement sensor collects real-time extrusion pressure and mold displacement at high frequency, while the temperature sensor synchronously monitors temperature changes. The specification selection module records the associated sleeve and rebar information.

[0039] All collected data undergoes real-time preprocessing and analysis via a programmable logic controller (PLC) module. The built-in deviation analysis algorithm dynamically compares real-time pressure, displacement, and temperature data with compensated preset standard values. If real-time pressure deviates from the allowable range due to factors such as temperature fluctuations, the system automatically calculates the pressure correction and immediately sends an adjustment command to the hydraulic master unit, achieving closed-loop feedback control of the pressure. If the real-time displacement does not reach the preset stroke, the system automatically extends the extrusion time until the displacement meets the requirements. Once both the extrusion stroke and holding time reach the set standards, the equipment automatically stops operating, completing a single extrusion connection process. All process data is uploaded to a cloud monitoring platform at a set frequency, enabling remote real-time monitoring and traceability of construction quality.

[0040] In some implementations, before the extrusion operation begins in steps S2 (establishing the first operating state) and S3 (establishing the second operating state), a system initialization and parameter setting preparation step must be performed, i.e., step S0 in the method claims. Specifically, the operator needs to start the hydraulic extrusion equipment, and the equipment's built-in automatic calibration program will then run to perform zero-point calibration on the integrated pressure displacement sensor and small temperature sensor integrated on the designated interface of the extrusion die to eliminate measurement reference errors. After calibration, the precise specifications and models of the segmented extrusion sleeve used in the current operation and the diameter of the rebar to be connected are input through the human-machine interface of the sleeve specification selection module. The control system automatically matches and retrieves the reference extrusion pressure, target extrusion displacement stroke, and necessary holding time suitable for the sleeve-rebar combination based on its built-in process parameter database, forming the initial process parameter set for this operation. At the same time, the local and cloud monitoring modules connected to the control system complete initialization and enter the ready state.

[0041] In some implementations, when step S2 is executed, and the first extrusion is applied to the first connecting end of the segmented extrusion sleeve to establish the first operating state, the closed-loop control mechanism based on real-time sensing of extrusion force and displacement is activated. The hydraulic host drives the mold to apply pressure to the sleeve, and the integrated pressure-displacement sensor collects and feeds back the actual extrusion force value and the radial displacement of the mold at a high frequency in real time. The control module is a programmable logic controller that continuously compares the collected actual extrusion force and displacement with preset benchmark values ​​in real time. The core of its control logic is to take displacement as the primary target indicator: during the extrusion process, if the real-time displacement does not reach the preset target stroke, the control module will automatically extend the holding time of the hydraulic system until the displacement meets the process requirements, ensuring that the sleeve is fully deformed. All real-time data generated during this process, including the extrusion force sequence, displacement curve, and corresponding sleeve and rebar numbering information, are synchronously recorded and transmitted to the monitoring module.

[0042] In some implementations, when performing step S3 to apply a second extrusion to the second connecting end of the segmented extrusion sleeve to establish a second operating state, in addition to the aforementioned dual-parameter control, an adaptive control that dynamically compensates for the reference extrusion pressure based on the real-time collected construction environment temperature is specifically introduced. Before operation and throughout the extrusion process, temperature sensors continuously collect the ambient temperature of the construction site and the mold temperature that rises due to equipment operation. A dedicated algorithm built into the control module calculates a dynamic pressure compensation coefficient based on this real-time temperature data, and corrects the initial reference extrusion pressure value retrieved from the database in real time to offset the potential impact of temperature changes on the hydraulic system efficiency and steel properties. The calculation algorithm's setting and implementation are well-known to those skilled in the art and will not be elaborated upon here. Subsequently, during the application of the temperature-compensated target pressure, an integrated pressure displacement sensor continuously monitors the actual extrusion pressure. If the actual extrusion pressure value deviates from the compensated target pressure range, the control module will immediately calculate the required pressure correction amount and issue a precise adjustment command to the hydraulic power unit, achieving real-time feedback and closed-loop compensation control of the extrusion pressure, thereby ensuring the stability of the connection strength under different ambient temperatures.

[0043] Throughout the extrusion operation, real-time monitoring and feedback processes operate synchronously. The monitoring module, including the local display screen on the equipment and a remote cloud platform, integrates and visualizes the received pressure, displacement, temperature, and all operating parameters in real time. The control module's built-in deviation analysis algorithm analyzes the continuously flowing data stream. Once the algorithm determines that a parameter is persistently abnormal and may affect connection quality, the monitoring module will immediately trigger an audible and visual alarm and prompt the operator to intervene. When the system confirms that both the extrusion displacement and holding time have simultaneously reached the set standards, the control module automatically terminates hydraulic output, stops the operation, and clearly issues a "process completed" prompt signal through the monitoring interface.

[0044] Through the complete control process described above, the construction method not only achieves reliable phased connection of steel bars, but also ensures the quality uniformity and traceability of each extrusion operation through a closed loop of perception, decision-making and execution, thereby fundamentally guaranteeing the final structural performance of the ultra-wide post-cast strip beam joint from a technological perspective.

[0045] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A rebar extrusion sleeve connection node for ultra-wide post-cast strip beams, comprising bottom beam reinforcement (1), segmented extrusion sleeves (2), top beam reinforcement (3), and web reinforcement (6), characterized in that: The bottom reinforcement (1), top reinforcement (3), and waist reinforcement (6) of the beam are set to remain disconnected before the post-cast strip of the structure is closed, and the segmented extrusion sleeve (2) is respectively fitted on their joint ends. The segmented extrusion sleeve (2) is configured to perform staged extrusion to achieve asynchronous mechanical connection with two butt-jointed reinforcing bars; wherein the segmented extrusion sleeve (2) has a first connecting end and a second connecting end, and is further configured as follows: In the first operating state, its first connecting end is pressed and fixed to a steel bar, while the second connecting end remains in a state where it can move relative to another steel bar or is ready to be connected. In the second operating state, its second connecting end is pressed and fixed to the other steel bar, so that the two steel bars are mechanically connected as a whole through the segmented extrusion sleeve (2).

2. The rebar extrusion sleeve connection node for ultra-wide post-cast strip beams as described in claim 1, characterized in that: Within the same connection section, the mechanical joints formed by the bottom reinforcement (1), top reinforcement (3) and web reinforcement (6) of the beam through the segmented extrusion sleeve (2) shall be staggered; wherein, the center-to-center distance between adjacent joints shall not be less than 35 times the diameter of the reinforcement, and the number of joints in any section shall not exceed 50% of the total number of the same type of reinforcement in that section.

3. A rebar extrusion sleeve connection node for ultra-wide post-cast strip beams as described in claim 1 or 2, characterized in that: The end faces of the bottom reinforcement (1), top reinforcement (3) and waist reinforcement (6) of the beam are processed into flat surfaces, and the perpendicularity deviation of the flat surface relative to the axis of the reinforcement is no more than 2mm.

4. A rebar extrusion sleeve connection node for ultra-wide post-cast strip beams as described in any one of claims 1-3, characterized in that: The inner diameter of the segmented extrusion sleeve (2) is configured to form a tight fit with the nominal outer diameter of the corresponding reinforcing bars in the bottom reinforcement (1), top reinforcement (3), or web reinforcement (6) of the beam for extrusion connection.

5. The rebar extrusion sleeve connection node for ultra-wide post-cast strip beams as described in claim 1, characterized in that: The joint ends of the bottom reinforcement (1), top reinforcement (3) and waist reinforcement (6) of the beam are rust-removed surfaces; and the ratio of the depth of insertion into the segmented extrusion sleeve (2) to the sleeve length is not less than 0.5; the sleeve wall of the segmented extrusion sleeve (2) is provided with a staged extrusion marking area, and / or its structure is configured to allow independent subsequent extrusion operations on the other end without affecting the connection strength of the already extruded end.

6. A construction method for a rebar extrusion sleeve connection node for ultra-wide post-cast beams as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Reservation and pretreatment: When pouring concrete structures on both sides of the post-pouring strip, the bottom reinforcement, top reinforcement and web reinforcement of the beam are reserved in the corresponding area of ​​the post-pouring strip according to the design, and the joint ends of the reinforcement are smoothed. S2. Assemble and establish the first operating state: Place the segmented extrusion sleeve onto the butt joint of the rebar; use a hydraulic extrusion device to perform the first extrusion operation on the first connecting end of the sleeve; the first extrusion operation adopts a closed-loop control based on real-time sensing of extrusion force and displacement dual parameters, so that the first connecting end is fixed to a rebar, while the second connecting end of the sleeve remains relatively movable to another rebar, thereby establishing the first operating state of the segmented extrusion sleeve; S3. Establishing the second operating state: After the post-cast strip meets the closure conditions, a second extrusion operation is performed on the second connecting end of the segmented extrusion sleeve in the first operating state; the second extrusion operation adopts adaptive control that dynamically compensates the reference extrusion pressure based on the real-time collected construction environment temperature, so that the second connecting end is fixedly connected to the other steel bar, thereby enabling all beam steel bars to achieve overall mechanical connection through the segmented extrusion sleeve, and establishing the second operating state; S4. Binding auxiliary reinforcement: After completing step S3, bind the stirrups and auxiliary reinforcement of the beam; S5. Pouring post-cast strip concrete: After completing step S4, pour post-cast strip concrete and cure it.

7. The construction method as described in claim 6, characterized in that, Before the extrusion operation in steps S2 and / or S3 begins, a preparation step is also included: S0. System initialization and parameter setting: The integrated pressure displacement sensor and temperature sensor integrated on the extrusion die are zero-point calibrated; the specification model of the currently used segmented extrusion sleeve and the diameter of the reinforcing bar are input through the sleeve specification selection module; the control system automatically matches and sets the reference extrusion pressure, target displacement stroke and holding time for this extrusion operation based on the built-in process database; at the same time, the monitoring module that communicates with the control system is initialized.

8. The construction method as described in claim 7, characterized in that, The closed-loop control based on real-time sensing of extrusion pressure and displacement mentioned in step S2 specifically includes: During the extrusion process, the integrated pressure displacement sensor collects the actual extrusion pressure and die displacement in real time; The control module compares the actual extrusion pressure and displacement with the set reference values ​​in real time. When the displacement does not reach the target stroke, the control module automatically extends the extrusion action time until the displacement meets the requirements; The real-time extrusion pressure, displacement, and corresponding sleeve specification information are recorded synchronously and transmitted to the monitoring module.

9. The construction method as described in claim 7 or 8, characterized in that, The adaptive control described in step S3, which dynamically compensates for the reference extrusion pressure based on the real-time collected construction environment temperature, specifically includes: Before and during the extrusion operation, the temperature sensor continuously collects the ambient temperature and the working temperature of the mold; The control module's built-in algorithm calculates and generates a dynamic pressure compensation coefficient based on the preset benchmark extrusion pressure according to the real-time temperature. The integrated pressure displacement sensor collects the actual extrusion force during the extrusion process; If the actual extrusion pressure deviates from the target pressure range after temperature compensation, the control module immediately calculates the pressure correction amount and sends a command to the hydraulic power unit to adjust the output pressure, thereby realizing real-time feedback and compensation control of the extrusion pressure.

10. The construction method as described in claim 7, characterized in that, The extrusion process in steps S2 and / or S3 also includes: Real-time monitoring and feedback steps: The monitoring module integrates and displays the received pressure, displacement, temperature and operating parameters; the deviation analysis algorithm built into the control module continuously analyzes the real-time data stream. If the data is determined to be continuously abnormal, the monitoring module will issue an alarm and prompt intervention; when the extrusion displacement and holding time both reach the set standards, the control module will automatically terminate the extrusion operation and issue a process completion signal through the monitoring module.

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