An intelligent grouting sleeve system and a grouting method

Abstract

This application provides an intelligent grouting sleeve system and grouting method, belonging to the field of building construction technology. The intelligent grouting sleeve system includes: a sleeve body for connecting reinforcing bars and containing grout mixed with a magnetic medium; an electromagnetic sensing module disposed on the outer wall of the sleeve body, the electromagnetic sensing module including a signal generating and receiving submodule and multiple detection coils arranged at intervals along the axial direction of the sleeve body, with an excitation coil disposed between adjacent detection coils; a vibration compensation module disposed on the outside of the sleeve body for generating vibration and transmitting the vibration to the grout; and a control module for controlling the vibration compensation module to vibrate according to the signals received by the signal generating and receiving submodules. This application can achieve accurate, real-time, and non-destructive density monitoring, and can eliminate defects of insufficient grouting before the grout solidifies, improving grouting construction efficiency and reliability.

Description

Technical Field

[0001] This application relates to the field of building construction technology, and in particular to an intelligent grouting sleeve system and grouting method. Background Technology

[0002] Prefabricated buildings, due to their advantages such as fast construction speed, minimal environmental impact, and easy quality control, have become an important direction for the development of modern construction industry. Among these, the reliability of connections between vertical components such as precast columns and shear walls is crucial to the overall structural safety, and grouting sleeves are the core component for achieving this rebar connection. The basic principle involves inserting the ribbed rebars to be connected into the grouting sleeve from both ends, then injecting a special high-performance cement-based grout into the sleeve's cavity. After the grout solidifies, the force transfer between the rebars is achieved through the anchoring effect of the grout. The density of the grout inside the grouting sleeve is a key indicator for measuring the quality of the rebar connection, directly affecting the bonding effect between the grout, the rebar, and the sleeve, thus impacting the structure's load-bearing capacity and durability. Accurate detection of the grout density inside the grouting sleeve and improvement of density defects are important issues in the quality control of prefabricated building projects.

[0003] In related technologies, grouting is performed by construction workers using handheld grouting guns. The determination of whether the grout cylinder is full is primarily based on observing whether grout flows out of the outlet at a uniform rate. Grout density testing is mainly conducted post-operatively, using non-destructive testing methods such as impact echo or ultrasonic testing, typically after grouting is complete and the grout has initially hardened. Alternatively, destructive testing methods such as the pre-embedded steel wire pull-out method can be used. If insufficient grout density is detected, remedial measures such as drilling or high-pressure grouting are generally employed.

[0004] However, the aforementioned quality inspection methods are outdated and destructive, failing to detect and locate internal density defects in real time during grouting. This leads to a disconnect between inspection and final execution, meaning that even if density defects are detected, immediate intervention is impossible, resulting in a passive situation of "inspection without treatment." Destructive inspection methods can damage the grout structure within the grouting sleeve. Therefore, the remedial measures mentioned above, once grouting deficiencies are detected, are not only difficult to guarantee effectiveness but also prone to causing secondary damage to the components. Summary of the Invention

[0005] This application provides an intelligent grouting sleeve system and grouting method, which can achieve accurate, real-time, and non-destructive compaction monitoring. It can eliminate defects in grout density before the grout solidifies, improving grouting construction efficiency and reliability. The technical solution includes at least the following: On one hand, an intelligent grouting sleeve system is provided, comprising: a sleeve body for connecting reinforcing bars and containing grout mixed with a magnetic medium; an electromagnetic sensing module disposed on the outer wall of the sleeve body, the electromagnetic sensing module including a signal generating and receiving submodule and a plurality of detection coils arranged at intervals along the axial direction of the sleeve body, an excitation coil being disposed between two adjacent detection coils, the signal generating and receiving submodule being used to drive the excitation coil to generate an alternating magnetic field and receive the magnetic field detection signal transmitted back by the detection coils to monitor the density of the grout; a vibration compensation module disposed on the outside of the sleeve body, for generating vibration and transmitting the vibration to the grout; and a control module electrically connected to the signal generating and receiving submodule and the vibration compensation module, for controlling the vibration compensation module to vibrate according to the signal received by the signal generating and receiving submodule.

[0006] Optionally, the grouting material contains reduced iron powder that has been surface-treated with a silane coupling agent as the magnetic medium.

[0007] Optionally, the particle size of the reduced iron powder is from 10 μm to 50 μm.

[0008] Optionally, the plurality of detection coils are electrically connected in a differential manner.

[0009] Optionally, the excitation coil is used to generate an alternating magnetic field with a frequency of 100kHz to 500kHz as an excitation signal.

[0010] Optionally, the vibration compensation module includes multiple vibration sub-modules, which are electrically connected, and each vibration sub-module is disposed outside a corresponding detection coil.

[0011] Optionally, the resonant submodule is a linear resonant actuator with a resonant frequency of 100Hz to 150Hz.

[0012] Optionally, both the electromagnetic sensing module and the vibration compensation module are encapsulated and fixed with epoxy resin.

[0013] Optionally, the intelligent grouting sleeve system further includes a grouting conduit for injecting the grouting material into the sleeve body, and the control module is disposed on the outer wall of the grouting conduit.

[0014] On the other hand, a grouting method is provided for the aforementioned intelligent grouting sleeve system. The grouting method includes: inserting the reinforcing bar to be connected into the sleeve body and injecting grout mixed with magnetic medium into the sleeve body; monitoring the density of the grout through an electromagnetic sensing module before the grout solidifies, and controlling the vibration compensation module to vibrate according to the signal received by the signal generation and receiving submodules through a control module.

[0015] The beneficial effects of the technical solution provided in this application include at least the following: In this embodiment, an electromagnetic sensing module is installed on the outer wall of the sleeve body. This module includes a signal generation and receiving submodule and multiple detection coils spaced axially along the sleeve body. An excitation coil is positioned between adjacent detection coils. The signal generation and receiving submodule drives the excitation coil to generate an alternating magnetic field and receives the magnetic field detection signal returned by the detection coils. This allows for precise, real-time, and non-destructive monitoring of the density of the grouting material containing magnetic media within the sleeve body. A control module and a vibration compensation module are installed on the outer side of the sleeve body. The control module controls the vibration compensation module to vibrate based on the signal received by the signal generation and receiving submodule. The vibration compensation module transmits the vibration to the grouting material, eliminating defects of insufficient density before the grouting material solidifies. This intelligent and proactive compensation of the grouting material's density during the grouting process avoids the problems of passively discovering grouting defects and the difficulty and high cost of post-treatment remediation. It shifts grouting quality control from "post-treatment" to "in-process elimination," reducing the probability of insufficient density and significantly improving grouting construction efficiency and reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an intelligent grouting sleeve system provided in an embodiment of this application.

[0018] Figure 2 This is a flowchart of a grouting method provided in an embodiment of this application.

[0019] Figure label: 10: Sleeve body; 11: Grout outlet; 12: Rebar connection point; 20: Electromagnetic sensing module; 21: Detection coil; 22: Excitation coil; 30: Vibration compensation module; 31: Vibration sub-module; 40: Control module; 50: Grouting conduit; 51: Ring buckle. Detailed Implementation

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a structural schematic diagram of an intelligent grouting sleeve system provided in an embodiment of this application. Figure 1 As shown, the intelligent grouting sleeve system includes: a sleeve body 10 for connecting reinforcing bars and containing grout mixed with magnetic medium; an electromagnetic sensing module 20 disposed on the outer wall of the sleeve body 10, the electromagnetic sensing module 20 including a signal generating and receiving submodule (not shown) and multiple detection coils 21 arranged at intervals along the axial direction of the sleeve body 10, an excitation coil 22 disposed between two adjacent detection coils 21, the signal generating and receiving submodule for driving the excitation coil 22 to generate an alternating magnetic field and receiving the magnetic field detection signal transmitted back by the detection coils 21 to monitor the density of the grout; a vibration compensation module 30 disposed on the outside of the sleeve body 10 for generating vibration and transmitting the vibration to the grout; and a control module 40 electrically connected to the signal generating and receiving submodule and the vibration compensation module 30 for controlling the vibration compensation module 30 to vibrate according to the signal received by the signal generating and receiving submodule.

[0023] In this embodiment, an electromagnetic sensing module 20 is provided on the outer wall of the sleeve body 10. The electromagnetic sensing module 20 includes a signal generation and receiving submodule and a plurality of detection coils 21 arranged at intervals along the axial direction of the sleeve body 10. An excitation coil 22 is provided between two adjacent detection coils 21. The signal generation and receiving submodule can drive the excitation coil 22 to generate an alternating magnetic field and receive the magnetic field detection signal transmitted back by the detection coils 21, thereby accurately, in real time and non-destructively monitoring the density of the grouting material mixed with magnetic medium inside the sleeve body 10. By setting a control module 40 and a vibration compensation module 30 on the outside of the sleeve body 10, the control module 40 can control the vibration compensation module 30 to vibrate according to the signals received by the signal generation and receiving submodules. The vibration compensation module 30 can transmit the vibration to the grout, thus eliminating the defect of insufficient grouting before the grout solidifies. During the grouting process, intelligent and proactive compensation of the density of the grout can be achieved, thereby avoiding the problems of passive discovery of grouting defects, difficult and costly post-event remediation. The grouting quality control is shifted from "post-event processing" to "in-event elimination", which helps to reduce the probability of insufficient grouting and can significantly improve the efficiency and reliability of grouting construction.

[0024] For example, the sleeve body 10 is a tubular structure, the inner wall of the sleeve body 10 is provided with a rib structure, and the end of the sleeve body 10 is provided with a steel bar inlet 12 for inserting ribbed steel bars.

[0025] For example, a grout inlet (not shown) is provided at one bottom end of the sleeve body 10, through which grout can be injected, and a grout outlet 11 is provided at one top end of the sleeve body 10, through which grout can flow out when the grout is full.

[0026] For example, the sleeve body 10 can be made of high-strength steel.

[0027] In this embodiment, the grouting material includes a base grout and a magnetic medium. For example, magnetic medium powder can be uniformly incorporated into the base grout to obtain a grouting material containing a magnetic medium.

[0028] For example, the base grout can be a high-strength, non-shrink cement-based grout that conforms to industry standards (such as JG / T 408-2019).

[0029] For example, the grout contains reduced iron powder that has been surface-treated with a silane coupling agent as a magnetic medium. This enhances the compatibility between the reduced iron powder and the base grout, reduces the probability of agglomeration and sedimentation, better ensures the uniform dispersion of the magnetic medium in the grout, and makes the grout a sensitive medium that can respond to changes in the magnetic field. This ensures that the electromagnetic sensing module 20 can monitor the grout density in real time and accurately through electromagnetic signals during the grouting process.

[0030] Optionally, the particle size of the reduced iron powder is from 10 μm to 50 μm.

[0031] For example, the particle size of the reduced iron powder can be 10 μm, 30 μm or 50 μm, etc.

[0032] The material and particle size of the magnetic medium described above are merely examples. In other embodiments, the material and particle size of the magnetic medium can also be adjusted according to actual needs, and this application does not impose any restrictions on this.

[0033] It should be noted that grouting materials containing magnetic media must ensure that key indicators such as initial fluidity, vertical expansion rate, and compressive strength still meet the standard requirements.

[0034] Optionally, multiple detection coils 21 are electrically connected in a differential manner. The detection coils 21 and the excitation coils 22 constitute a differential eddy current coil structure, which can effectively suppress background interference caused by the sleeve metal material itself, and more accurately detect the weakly changing effective magnetic field signal under the strong background noise of the sleeve body 10, and receive the magnetic field signal changed by the change in the density of the grouting material inside the sleeve body 10 (i.e., the change in the distribution of the magnetic medium).

[0035] For example, the signal generation and receiving submodule, detection coil 21, and excitation coil 22 are connected by an integrated circuit, which can reduce the probability of signal interference by metal sleeves or concrete.

[0036] like Figure 1 As shown, in this embodiment, the electromagnetic sensing module 20 includes three detection coils 21 evenly spaced along the axial direction of the sleeve body 10. An excitation coil 22 is disposed between two adjacent detection coils 21, for a total of two excitation coils 22. The three detection coils 21 are electrically connected differentially. In other embodiments, the number of detection coils 21 and excitation coils 22 can be adjusted as needed, and this application does not impose any limitations on this.

[0037] For example, both the detection coil 21 and the excitation coil 22 are wound with Litz wire. This can reduce skin effect losses at high frequencies.

[0038] Optionally, the excitation coil 22 is used to generate an alternating magnetic field with a frequency of 100kHz to 500kHz as an excitation signal. Using a high-frequency alternating magnetic field helps to improve the sensitivity of density detection.

[0039] For example, the excitation coil 22 can be used to generate an alternating magnetic field with a frequency of 100 kHz, 300 kHz or 500 kHz as an excitation signal.

[0040] It should be noted that the frequency of the excitation signal generated by the excitation coil 22 can be optimized and adjusted experimentally for specific sleeve size and wall thickness to achieve the best balance between penetration depth and detection sensitivity. This application does not impose any restrictions on this.

[0041] Optionally, the vibration compensation module 30 includes multiple vibration sub-modules 31 electrically connected, with each vibration sub-module 31 positioned outside a corresponding detection coil 21. Thus, when a defect of insufficient compaction is detected at a location corresponding to a detection coil, the control module 40 can precisely control the vibration sub-module 31 at that location to vibrate, thereby improving the compaction of the grouting material in the corresponding area.

[0042] In this embodiment, the vibration compensation module 30 includes three vibration sub-modules 31, which are arranged one-to-one with the three detection coils 21. In other embodiments, the arrangement position and number of vibration sub-modules 31 can be adjusted according to actual needs. For example, one or two vibration sub-modules 31 can be arranged on the upper and middle outer sides of the sleeve body 10 according to its length. This application does not limit this.

[0043] For example, multiple vibration sub-modules 31 are electrically connected through a power drive circuit, and the control module 40 can control the start and stop of the vibration sub-modules 31 and control the vibration intensity through the power drive circuit.

[0044] Optionally, the vibration submodule 31 is a linear resonant actuator with a resonant frequency of 100Hz to 150Hz. Within this range, the resonant frequency can be matched with the rheological properties of the grout, thereby effectively promoting the flow of uncured grout and improving its density.

[0045] For example, the resonant submodule 31 can be a medium to large linear resonant actuator with a resonant frequency of 100Hz, 125Hz or 150Hz.

[0046] In this embodiment, both the electromagnetic sensing module 20 and the vibration compensation module 30 are encapsulated and fixed with epoxy resin. For example, the detection coil 21 and the excitation coil 22 can be precisely fixed within an engineering plastic annular frame on the outer wall of the sleeve body 10, and then encapsulated and fixed with epoxy resin. The signal generation and receiving submodules and the integrated circuit are also encapsulated and fixed on the outer wall of the sleeve body 10 with epoxy resin. The vibration submodule 31 can be permanently fixed to the outside of the detection coil 21 with epoxy resin, and the power drive circuit can be encapsulated and fixed to the outer wall of the sleeve body 10 with epoxy resin. Epoxy resin has high modulus and high toughness, which can form a robust, moisture-proof, and shock-proof integrated system. This can prevent the electromagnetic sensing module 20 and the vibration compensation module 30 from being damaged by external factors, and they are permanently cast inside the precast column with concrete, improving reliability and ensuring efficient transmission of vibration energy. In other embodiments, the vibration submodule 31 can also be fixed to the outside of the detection coil 21 with other high-strength industrial adhesives or mechanical clamps.

[0047] In one possible implementation, the control module 40 includes a main control submodule, a display submodule, and a communication submodule. The main control submodule processes signals received by the signal generation and receiving submodules and issues control commands to control the vibration compensation module 30 to vibrate. The main control submodule can also record data and may be an integrated microcontroller. The display submodule enables visualization of the compaction status and may be an integrated display screen. The communication submodule facilitates communication and interaction between grouting site parameters and external signals. For example, it can upload real-time compaction data and vibration trigger records to the construction management and monitoring platform, enabling data uploading and remote monitoring for digital management and traceability of the construction process. The communication submodule may be a wireless communication submodule or a communication interface.

[0048] like Figure 1 As shown, the intelligent grouting sleeve system also includes a grouting conduit 50 for injecting grout into the sleeve body 10, and a control module 40 is disposed on the outer wall of the grouting conduit 50. Exemplarily, the outer wall of the grouting conduit 50 is provided with an annular buckle 51, and the control module 40 is fixed to the outer wall of the grouting conduit 50 via the annular buckle 51. Grout can be injected into the sleeve body 10 from the grout inlet at one bottom end through the grouting conduit 50. The control module 40 can be electrically connected to the signal generation and receiving submodule and the vibration compensation module 30 via cables.

[0049] In this embodiment, the intelligent grouting sleeve system can be powered by a safe DC voltage (such as 24V DC). The working principle of the intelligent grouting sleeve system is as follows: Before grouting, the electromagnetic sensing module 20 can perform an empty sleeve scan, and the control module 40 records the electromagnetic signal when there is no grout in the current environment as a baseline value. After grouting begins, the electromagnetic sensing module 20 samples at a rate of 10 to 100 times per second. The control module 40 calculates the amplitude attenuation or phase change of the signal in real time based on the signal generated and received by the signal receiving submodule, and compares it with a preset density threshold. If the signal is lower than the threshold for N consecutive times (e.g., 3 times), it is determined that the density of the area is insufficient. The control module 40 sends a drive pulse with a duration of T1 to the vibration submodule 31 at the corresponding position. After the vibration stops, if the signal is still lower than the threshold, the next drive pulse with a duration of T2 (the duration T2 is slightly longer than T1) is started, and this process is repeated continuously until the signal is greater than or equal to the threshold, or the preset maximum number of vibrations is reached. The preset density threshold, which is the signal threshold corresponding to the qualified density, can be determined in advance through a large number of experiments. This can form an effective intelligent closed-loop control of "detection-vibration-verification", thereby achieving accurate, real-time and non-destructive density monitoring, which is conducive to eliminating the defect of insufficient grouting before the grout solidifies.

[0050] Figure 2 This is a flowchart illustrating a grouting method provided in an embodiment of this application. This grouting method is applied to the aforementioned intelligent grouting sleeve system, such as... Figure 2 As shown, the grouting method includes: Step S1: Insert the reinforcing bar to be connected into the sleeve body and inject grout mixed with magnetic medium into the sleeve body.

[0051] Step S2: Before the grout solidifies, the density of the grout is monitored by the electromagnetic sensing module, and the vibration compensation module is controlled by the control module to vibrate according to the signals received by the signal generation and receiving submodules.

[0052] It should be noted that the grouting method provided in the above embodiments and the intelligent grouting sleeve system belong to the same concept. The beneficial effects and principles of this embodiment can be found in the above intelligent grouting sleeve system embodiments, which will not be repeated here.

[0053] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An intelligent grouting sleeve system, characterized in that, include: The sleeve body is used to connect the reinforcing bars and contain the grout mixed with magnetic media; An electromagnetic sensing module is disposed on the outer wall of the sleeve body. The electromagnetic sensing module includes a signal generation and receiving submodule and a plurality of detection coils arranged at intervals along the axial direction of the sleeve body. An excitation coil is disposed between two adjacent detection coils. The signal generation and receiving submodule is used to drive the excitation coil to generate an alternating magnetic field and receive the magnetic field detection signal transmitted back by the detection coil to monitor the density of the grouting material. A vibration compensation module is disposed on the outside of the sleeve body and is used to generate vibration and transmit the vibration to the grouting material; The control module is electrically connected to the signal generation and receiving submodule and the vibration compensation module, and is used to control the vibration compensation module to vibrate according to the signal received by the signal generation and receiving submodule.

2. The intelligent grouting sleeve system according to claim 1, characterized in that, The grouting material contains reduced iron powder that has been surface-treated with a silane coupling agent as the magnetic medium.

3. The intelligent grouting sleeve system according to claim 2, characterized in that, The particle size of the reduced iron powder is 10 μm to 50 μm.

4. The intelligent grouting sleeve system according to claim 1, characterized in that, The multiple detection coils are electrically connected in a differential manner.

5. The intelligent grouting sleeve system according to claim 1, characterized in that, The excitation coil is used to generate an alternating magnetic field with a frequency of 100kHz to 500kHz as an excitation signal.

6. The intelligent grouting sleeve system according to claim 1, characterized in that, The vibration compensation module includes multiple vibration sub-modules, which are electrically connected, and each vibration sub-module is located outside a corresponding detection coil.

7. The intelligent grouting sleeve system according to claim 6, characterized in that, The vibrating submodule is a linear resonant actuator with a resonant frequency of 100Hz to 150Hz.

8. The intelligent grouting sleeve system according to any one of claims 1 to 7, characterized in that, Both the electromagnetic sensing module and the vibration compensation module are encapsulated and fixed with epoxy resin.

9. The intelligent grouting sleeve system according to any one of claims 1 to 7, characterized in that, The intelligent grouting sleeve system also includes a grouting conduit for injecting the grouting material into the sleeve body, and the control module is disposed on the outer wall of the grouting conduit.

10. A grouting method, characterized in that, The grouting method, applied to the intelligent grouting sleeve system according to any one of claims 1 to 9, comprises: Insert the reinforcing bar to be connected into the sleeve body and inject grout mixed with magnetic medium into the sleeve body; Before the grout solidifies, the density of the grout is monitored by an electromagnetic sensing module, and the vibration compensation module is controlled to vibrate by a control module based on the signals received by the signal generation and receiving submodules.

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