Method for real-time detection of internal grout fullness during sleeve grouting

Abstract

The application discloses a method for detecting the internal slurry fullness of a sleeve during grouting in real time, relates to the technical field of bubble detection in fluid, and comprises a signal generating device and a grouting sleeve. The signal generating device is connected with a grouting pipeline through a three-way pipe with a switch. Detection devices are connected with the grouting pipeline at the inlet and outlet of the grouting sleeve. The end of the grouting pipeline at the outlet of the grouting sleeve is provided with a switch. The grouting inlet and outlet are fixed on the slurry inlets and outlets of the target sleeve. The signal generating device is arranged. The detection device generates signals through the signal generating device, collects and analyzes the inlet and outlet signals through the detection device, and judges whether there are bubbles in the slurry in the sleeve and how many bubbles are in the slurry. The whole device is simple to operate and flexible to use. After grouting is completed, the grouting channel switch is closed, the signal generating device is started and detection is performed. If it is detected that the bubbles in the sleeve exceed the requirement, the grouting channel can be opened to supplement the grouting. Real-time detection can be performed, and defects can be compensated in time.

Description

Technical Field

[0001] This invention relates to the field of fluid bubble detection technology, specifically a method for real-time detection of the saturation of grout inside a sleeve during grouting. Background Technology

[0002] The continuous advancement of building industrialization and housing industrialization has promoted the vigorous development of prefabricated buildings, among which sleeve grouting connection is a key link. The reliability of sleeve grouting connection has a significant impact on the overall safety of prefabricated buildings, therefore, strict quality control of sleeve grouting connection is necessary.

[0003] Chinese Invention Patent CN201811389345.5: A sleeve grouting quality testing device, comprising an insulating base, multiple inner conductors, an external conductor, and a feedback device. Each inner conductor is pre-embedded within the insulating base and is mutually insulated. One end of two inner conductors extends out of the insulating base as a lead, which is connected to the feedback device via the external conductor. The feedback device measures the resistance value of the formed circuit. This invention has the advantages of convenient installation and simple operation. The sleeve grouting quality testing device of this invention uses multiple inner conductors; different grouting effects cause changes in the conductivity between the inner conductors, which are reflected by changes in resistance values, thereby greatly improving the sensitivity of sleeve grouting quality testing.

[0004] It is known that the invention uses multiple wires, which is cumbersome and complicated, resulting in low grouting efficiency and slow speed.

[0005] Chinese Invention Patent CN201810863700.1: A method for detecting the fullness of grouting in sleeves based on endoscopic three-dimensional dimensional measurement technology. The method includes a rubber stopper, a suction tube covered with a thin film, a rigid sleeve, and a three-dimensional measuring endoscope. During sleeve grouting construction, after grout flows out of the outlet channel, a detection channel is prepared within the outlet channel using the rubber stopper and the suction tube covered with the thin film. After the grout hardens, the rubber stopper is removed, and the suction tube inside the thin film is taken out, leaving the thin film in the outlet channel to form the detection channel. Then, the length of the grouting defect is detected using the rigid sleeve and the three-dimensional measuring endoscope. By comparing this length with the designed anchorage length of the connecting steel reinforcement, the grouting fullness ratio is obtained. This invention has the advantages of low detection cost, convenient operation, and high accuracy. It allows for intuitive, clear, and quantitative observation and measurement of grouting defects, thereby calculating the grouting fullness.

[0006] It is known that this invention requires waiting for the slurry to harden before testing can be carried out. If the test fails, it cannot be remedied in time, resulting in some waste and increased costs.

[0007] Currently, during grouting operations, quality control of sleeve grouting mainly relies on systematic worker training, reasonable construction methods, and effective management. Most techniques for detecting the internal filling effect of the grouting sleeve involve checking for voids after the grout has solidified, such as using X-ray detection, ultrasonic detection, or direct cutting for observation. However, these methods are not efficient or timely enough for addressing grout voids. Furthermore, there is no method on the market that can detect the saturation of the grout within the sleeve in real time. Therefore, this paper proposes a method for real-time detection of the grout fullness inside the sleeve during grouting. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for real-time detection of the saturation of internal grout during sleeve grouting, thereby solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a method for real-time detection of the saturation of internal grout during sleeve grouting, the specific steps of which are as follows:

[0010] S1: Equipment connection: Detection devices are installed on the inlet and outlet pipes of the grouting sleeve. A signal generator is connected to one end of the feed pipe. A tee with a switch is installed on the feed pipe and connected to the grouting delivery pipe.

[0011] S2: Grouting: Concrete grout is delivered to the feed pipe through a tee with a switch by a grouting machine. The grout enters the grouting sleeve through the feed pipe and overflows from the discharge pipe at the top of the grouting sleeve.

[0012] S3: The signal generator produces a vibration signal, which is transmitted to the pipeline and the grouting sleeve. The environmental sensor and signal receiving sensor in the two detection devices at the inlet and outlet of the grouting sleeve then detect and analyze the changes in the parameters of the two signals to determine whether there are air bubbles inside the grouting sleeve.

[0013] As a preferred embodiment of the present invention, the signal generating device is a vibration excitation device, which includes a DC motor, a motor base, a coupling, a bearing housing, an eccentric wheel, a pin, a connecting rod, a push rod, a pump core, a pump, an aluminum body, and a positioning cover.

[0014] As a preferred embodiment of the present invention, the DC motor is fixed on a motor base, and the output shaft of the DC motor is rotatably connected to an eccentric wheel mounted on a bearing seat via a coupling. The eccentric wheel is connected to a connecting rod via a pin, and the other end of the connecting rod is connected to a push rod.

[0015] As a preferred embodiment of the present invention, the push rod is threaded and connected to the thread on the pump core. The pump core is assembled with the pump. The pump is fixed in the aluminum body and the other end is fixed with a positioning cover. The center hole of the positioning cover is threaded and connected to a three-way valve with a switch.

[0016] As a preferred embodiment of the present invention, the grouting sleeve includes a sleeve valve body, a threaded metal rod, and a sleeve cover. The top and bottom ends of the sleeve valve body are both connected to the sleeve cover by threads. The sleeve cover has a threaded through hole in the middle. The threaded metal rod is connected to the threaded through hole in the middle of the sleeve cover. The grouting sleeve's inlet and outlet slurry ports are connected to the grouting pipeline through a conversion joint.

[0017] As a preferred embodiment of the present invention, the detection device includes a sensor fixing valve body, an environmental sensor, a signal receiving sensor, and a conversion connector; the detection ends of the environmental sensor and the signal receiving sensor are both threaded, and the environmental sensor and the signal receiving sensor are installed on corresponding threaded holes on the sensor fixing valve body via the threads.

[0018] In a preferred embodiment of the present invention, both the signal generating device and the detection device are electrically connected to the control panel.

[0019] As a preferred embodiment of the present invention, the environmental sensor is model WZPB-231; the signal receiving sensor is model BS-405.

[0020] As a preferred embodiment of the present invention, a switch is installed at the end of the grouting pipe at the outlet of the grouting sleeve.

[0021] The beneficial effects of this invention are as follows: This invention fixes the grouting inlet and outlet to the grout inlet and outlet of the target sleeve. By setting up a signal generating device, the detection device generates a signal through the signal generating device and collects and analyzes the inlet and outlet signals to determine whether there are air bubbles in the grout inside the sleeve and how many. The whole device is simple to operate and flexible to use. After grouting is completed, the grouting channel switch is closed, the signal generating device is started and detection is performed. If the number of air bubbles inside the sleeve exceeds the requirements, the grouting channel can be opened to add grout. Real-time detection and timely compensation for defects are possible. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the vibration excitation device in the signal generating device of the present invention;

[0024] Figure 3 This is a schematic diagram of the detection device of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the grouting sleeve of the present invention;

[0026] In the diagram: 1. Signal generating device; 2. Tee with switch; 3. Grouting sleeve; 4. Detection device; 5. Switch; 101. DC motor; 102. Motor base; 103. Coupling; 104. Bearing seat; 105. Eccentric wheel; 106. Pin; 107. Connecting rod; 108. Push rod; 109. Pump core; 110. Pump; 111. Aluminum body; 112. Positioning cover; 301. Sleeve valve body; 302. Threaded metal rod; 303. Sleeve cover; 401. Sensor fixing valve body; 402. Environmental sensor; 403. Signal receiving sensor; 404. Adapter connector.

[0027] Figure 5 This is a graph showing the change in amplitude ratio in an embodiment of the present invention;

[0028] A: Amplitude ratio of the first test; B: Amplitude ratio of the second test; C: Amplitude ratio of the third test;

[0029] Figure 6 This is a waterfall plot of the root mean square ratio in an embodiment of the present invention;

[0030] a: Root mean square ratio of the first experiment; b: Root mean square ratio of the second experiment; c: Root mean square ratio of the third experiment;

[0031] Figure 7 This is a waterfall plot of the peak-to-peak ratios in three experiments in this embodiment of the invention;

[0032] AA: Peak-to-peak ratio of the first test; BB: Peak-to-peak ratio of the second test; CC: Peak-to-peak ratio of the third test;

[0033] Figure 8 This is a waterfall plot showing the changes in the outlet amplitude during three tests in this embodiment of the invention;

[0034] aa: Export amplitude of the first test; bb: Export amplitude of the second test; cc: Export amplitude of the third test. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0036] Example: Please refer to Figure 1-4 This invention provides a technical solution: a method for real-time detection of the saturation of internal grout during sleeve grouting, the specific steps of which are as follows:

[0037] S1: Equipment connection: Detection devices 4 are installed on the inlet and outlet pipes of the grouting sleeve 3. A signal generator 1 is connected to one end of the feed pipe. A tee with a switch 2 is installed on the feed pipe. The tee with the switch 2 is connected to the grouting delivery pipe.

[0038] S2: Grouting: Concrete grout is delivered to the feed pipe through the switch tee 2 by the grouting machine, enters the grouting sleeve 3 through the feed pipe, and overflows from the discharge pipe at the top of the grouting sleeve 3;

[0039] S3: The signal generating device 1 generates a vibration signal, which is transmitted to the pipeline and the grouting sleeve 3. Then, the environmental sensor 402 and the signal receiving sensor 403 in the two detection devices 4 at the inlet and outlet of the grouting sleeve 3 are detected and analyzed to determine whether there are air bubbles inside the grouting sleeve 3.

[0040] The signal generating device 1 is a vibration excitation device. The signal generating device 1 includes a DC motor 101, a motor base 102, a coupling 103, a bearing housing 104, an eccentric wheel 105, a pin 106, a connecting rod 107, a push rod 108, a pump core 109, a pump 110, an aluminum body 111, and a positioning cover 112.

[0041] The DC motor 101 is fixed on the motor base 102. The output shaft of the DC motor 101 is rotatably connected to the eccentric wheel 105 mounted on the bearing housing 104 through the coupling 103. The eccentric wheel 105 is connected to the connecting rod 107 through the pin 106. The other end of the connecting rod 107 is connected to the push rod 108.

[0042] The push rod 108 is threaded and connected to the threaded part of the pump core 109. The pump core 109 is assembled with the pump 110. The pump 110 is fixed in the aluminum body 111. The other end is fixed with the positioning cover 112. The center hole of the positioning cover 112 is threaded and connected to the switch tee 2.

[0043] The grouting sleeve 3 includes a sleeve valve body 301, a threaded metal rod 302, and a sleeve cover 303. The top and bottom ends of the sleeve valve body 301 are both threadedly connected to the sleeve cover 303. The sleeve cover 303 has a threaded through hole in the middle. The threaded metal rod 302 is connected to the threaded through hole in the middle of the sleeve cover 303. The grouting sleeve 3's inlet and outlet slurry ports are connected to the grouting pipeline through a conversion joint.

[0044] The detection device 4 includes a sensor fixing valve body 401, an environmental sensor 402, a signal receiving sensor 403, and a conversion connector 404; the detection ends of the environmental sensor 402 and the signal receiving sensor 403 are both threaded, and the environmental sensor 402 and the signal receiving sensor 403 are installed on the corresponding threaded holes on the sensor fixing valve body 401 by the threads.

[0045] Both the signal generating device 1 and the detection device 4 are electrically connected to the control panel.

[0046] The model number of the environmental sensor 402 is WZPB-231; the model number of the signal receiving sensor 403 is BS-405.

[0047] A switch 5 is installed at the end of the grouting pipe at the outlet of the grouting sleeve 3.

[0048] Working principle: This method allows for real-time detection of the saturation of the grout inside the sleeve during grouting. In use, concrete grout is injected into the grouting sleeve 3 through a tee with a switch 2 using a grouting machine. Then, the switch on the tee 2 is turned off, and the power to the DC motor 101 is turned on via the control panel. The DC motor 101 drives the eccentric wheel 105 to rotate, causing the crank-slider mechanism, composed of the eccentric wheel 105, connecting rod 107, push rod 108, and pump core 109, to reciprocate, generating a vibration signal. This signal is transmitted to the pipeline and the grouting sleeve 3, and then detected by two detection devices 4 at the inlet and outlet of the grouting sleeve 3. The changes in parameters of the signals at both locations are analyzed to determine whether air bubbles exist inside the grouting sleeve. The environmental sensor 402 is used to detect the state of the grout in the pipeline, determining the working state of the signal detection sensor and the potential detection error. The signal receiving sensor 403 is used to detect the signal generated by the signal generator.

[0049] The inlet and outlet pressure detection signals are processed as follows to serve as a criterion for comprehensively judging whether there are cavitation bubbles inside the grouting sleeve.

[0050] 1. Amplitude ratio change graph;

[0051] Figure 5 This is the amplitude ratio in the three tests, that is, the ratio of the outlet pressure amplitude to the inlet pressure amplitude.

[0052] It can be seen that the image trends of the three experiments are quite similar. In all three experiments, the outlet amplitude is higher than the inlet amplitude at a lower excitation frequency. After a certain frequency, the difference between the outlet amplitude and the inlet amplitude drops sharply. This frequency varies depending on the presence of air bubbles, and even with the same number of air bubbles, the transition frequency differs in each experiment. At around 1800 r / min, a step-like decline can be observed in the image as the volume of air decreases from 0 ml to 40 ml.

[0053] 2. Root mean square ratio variation graph;

[0054] Figure 6 This is a waterfall plot of the root mean square ratio for three tests, which is the ratio of the root mean square of the outlet pressure to the root mean square of the inlet pressure.

[0055] As can be seen from the figure, the sleeve exhibits significantly different responses under different excitation frequencies when the bubble content inside the sleeve varies. In all three experiments, it was observed that within the range of 1500 r / min to 2000 r / min, the lower the bubble content inside the sleeve, the larger the ratio of the outlet RMS to the inlet RMS, indicating lower attenuation.

[0056] 3. Peak-to-peak ratio variation graph;

[0057] Figure 7 This is a waterfall plot of the peak-to-peak ratio in the three tests, which is the ratio of the peak outlet pressure to the peak inlet pressure.

[0058] As can be seen from the peak-to-peak ratio graph, at speeds of around 1500 r / min to 1800 r / min, the lower the bubble content inside the sleeve, the higher the peak-to-peak ratio, meaning the smaller the attenuation.

[0059] 4. Export pressure amplitude variation graph;

[0060] Figure 7 This is a waterfall chart showing the changes in the export amplitude during the three tests.

[0061] As can be seen from the figure, under lower frequency excitation, the outlet amplitude is relatively large. However, as the excitation frequency increases, the outlet pressure decreases significantly, even to the point where the sensor cannot detect the pressure signal. The figure also shows that a larger amplitude appears near a certain high frequency, indicating the existence of another resonance point in the system.

[0062] In summary, the number of bubbles in this invention is a relative number, not a specific quantity. The change in the number of bubbles can be determined by referring to the changes in the corresponding data in graphs such as the root mean square ratio change graph, peak-to-peak ratio change graph, amplitude ratio change graph, and outlet pressure amplitude change graph.

[0063] The amplitude variation graphs show that the trends in the three experiments are quite similar. In all three experiments, the outlet amplitude is higher than the inlet amplitude at a lower excitation frequency. After a certain frequency, the difference between the outlet and inlet amplitudes drops sharply. This frequency varies depending on the presence of air bubbles, and even with the same number of air bubbles, the transition frequency differs in each experiment. At approximately 1800 r / min, a step-like decrease in amplitude can be observed from 0 ml air bubbles to 40 ml air bubbles.

[0064] When the results from the two detection devices are the same, there are no bubbles; when the results are different, bubbles are present. The root mean square ratio (RMS) variation graph shows that different bubble contents within the sleeve result in significantly different responses under different excitation frequencies. In all three experiments, it was observed that between 1500 r / min and 2000 r / min, the lower the bubble content within the sleeve, the higher the outlet RMS ratio compared to the inlet RMS ratio, indicating lower attenuation. No attenuation indicates the absence of bubbles. The principle is to determine the amount of bubbles by obtaining different RMS ratio variation graphs based on changes in vibration frequency.

[0065] The above embodiments merely illustrate implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A method for real-time detection of the saturation of internal grout during sleeve grouting, characterized in that: The specific steps are as follows: S1: Equipment connection: Detection devices (4) are installed on the pipes at the inlet and outlet of the grouting sleeve (3), a signal generator (1) is connected to one end of the feed pipe, a tee with switch (2) is installed on the feed pipe, and the tee with switch (2) is connected to the grouting conveying pipe. S2: Grouting: The concrete grout is delivered to the feed pipe through the switch tee 2 by the grouting machine, enters the grouting sleeve (3) through the feed pipe, and overflows from the discharge pipe at the top of the grouting sleeve (3); S3: The signal generating device (1) works to generate a vibration signal. The signal is transmitted into the pipeline and the grouting sleeve (3). Then, the environmental sensor (402) and the signal receiving sensor (403) in the two detection devices (4) at the inlet and outlet of the grouting sleeve (3) are used to detect and analyze the changes in the parameters of the two signals to determine whether there are air bubbles inside the grouting sleeve (3).

2. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: The signal generating device (1) is a vibration excitation device. The signal generating device (1) includes a DC motor (101), a motor base (102), a coupling (103), a bearing housing (104), an eccentric wheel (105), a pin (106), a connecting rod (107), a push rod (108), a pump core (109), a pump (110), an aluminum body (111), and a positioning cover (112).

3. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 2, characterized in that: The DC motor (101) is fixed on the motor base (102). The output shaft of the DC motor (101) is rotatably connected to the eccentric wheel (105) mounted on the bearing seat (104) through the coupling (103). The eccentric wheel (105) is connected to the connecting rod (107) through the pin (106). The other end of the connecting rod (107) is connected to the push rod (108).

4. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 2, characterized in that: The push rod (108) is threaded and connected to the thread on the pump core (109). The pump core (109) is assembled with the pump (110). The pump (110) is fixed in the aluminum body (111) and the other end is fixed with the positioning cover (112). The center hole on the positioning cover (112) is threaded and connected to the tee with switch (2).

5. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: The grouting sleeve (3) includes a sleeve valve body (301), a threaded metal rod (302), and a sleeve cover (303). The top and bottom ends of the sleeve valve body (301) are both connected to the sleeve cover (303) by threads. The sleeve cover (303) has a threaded through hole in the middle. The threaded metal rod (302) is connected to the threaded through hole in the middle of the sleeve cover (303). The grouting sleeve (3) is connected to the grouting pipeline through a conversion joint.

6. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: The detection device (4) includes a sensor fixing valve body (401), an environmental sensor (402), a signal receiving sensor (403), and a conversion connector (404); the detection ends of the environmental sensor (402) and the signal receiving sensor (403) are both threaded, and the environmental sensor (402) and the signal receiving sensor (403) are installed on the corresponding threaded holes on the sensor fixing valve body (401) by the threads.

7. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: Both the signal generating device (1) and the detection device (4) are electrically connected to the control panel.

8. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: The environmental sensor (402) is model WZPB-231; the signal receiving sensor (403) is model BS-405.

9. The method for real-time detection of the saturation of internal grout during sleeve grouting according to claim 1, characterized in that: A switch (5) is installed at the end of the grouting pipe at the outlet of the grouting sleeve (3).

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