System for measuring internal defects of underwater concrete structure
By designing a signal excitation and acquisition system, the vibration excitation head is controlled to excitate with high-pressure gas cylinders and solenoid valves, and signal acquisition is achieved through sealed pistons and reset gas chambers, solving the data acquisition problem of impact elastic wave detection in underwater concrete detection. , realizes rapid and automated underwater concrete quality inspection.
Patent Information
- Application Number
- CN202411064173.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-01-03
AI Technical Summary
In the quality inspection of underwater concrete, impact elastic wave detection is difficult to be effectively carried out in complex water environments. Traditional manual knocking methods and acceleration sensors are not applicable, resulting in a gap in data collection methods.
A system including a signal excitation system and a signal acquisition system is designed. The vibration excitation head is controlled to excite the vibration through a high-pressure gas cylinder and a solenoid valve. The vibration excitation signal is triggered and collected by combining the sealed piston and the reset gas chamber. The signal acquisition system is used to achieve the triggering and acquisition of the excitation signal. The counterweight blocks and sensors are stably fixed on the concrete surface to adapt to different water flow velocities and surface uneven conditions.
It realizes rapid and automated excitation and signal acquisition in underwater concrete quality detection, fills the gap in data acquisition of impact elastic wave detection technology in the field of underwater detection, and can work normally in high water pressure environments.
Smart Images
Figure CN119246674A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of underwater concrete quality detection, and in particular to a system for measuring internal defects of an underwater concrete structure. Background Art
[0002] With the development of my country's economy and social progress, water conservancy projects have become an important driving force to ensure the steady and rapid development of the national economy. Once a water conservancy project has safety hazards or causes a safety accident, it will cause irreversible damage to the lives and property of the surrounding people. As a synthetic building material, the performance of concrete is greatly affected by temperature, construction conditions and construction technology. The surface of concrete often has quality problems such as honeycombs, cracks, unevenness, partial detachment, exposed steel bars, etc., which pose a huge threat and hidden danger to the overall quality and safe construction of the project. Therefore, the quality of underwater concrete in water conservancy projects must be tested and controlled to better ensure the overall safety and reliability of water conservancy projects.
[0003] At present, the detection of underwater concrete quality mainly includes core sample test, in-hole TV, underwater video, and sound wave test. The core sample test and in-hole TV methods have different degrees of damage to the test object. The more popular detection method is the impact elastic wave non-destructive detection that does not damage the test object. However, the impact elastic wave detection requires the vibration source to be generated by knocking, and the acceleration sensor receives the effective vibration signal. In a complex water environment, due to the water pressure in the water, the manual knocking method and the general acceleration sensor are no longer applicable. Therefore, it is very necessary to design a system that can accurately measure the internal defects of underwater concrete structures. Summary of the invention
[0004] The purpose of the present invention is to provide a system for measuring internal defects of underwater concrete structures, which can quickly, effectively and automatically complete the excitation and signal acquisition of impact elastic wave detection technology in underwater concrete quality detection, and perfectly fill the gap in data acquisition methods in the field of underwater concrete quality detection using impact elastic wave detection technology.
[0005] To achieve the above object, the present invention provides the following solutions:
[0006] A system for measuring internal defects of underwater concrete structures, comprising: a signal excitation system and a signal acquisition system, wherein the signal excitation system is arranged on one side of the signal acquisition system, and the two are connected by threads, the signal excitation system is used to generate a vibration signal, and the signal acquisition system is used to collect the vibration signal and self-fix the entire detection system;
[0007] The signal excitation system includes a cavity main structure, an excitation head, a sealing piston and an excitation bottom plate, the cavity main structure is arranged on the excitation bottom plate, the excitation head is arranged inside the cavity main structure, and the excitation head and the cavity main structure are assembled with interference fit, the excitation head is arranged with a groove, the groove has a maximum stroke limiting effect on the excitation head, the sealing ring is arranged between the inner wall of the head of the cavity main structure and the groove, the tail of the excitation head is a T-shaped structure, the sealing piston is arranged between the tail of the excitation head and the inner wall of the cavity main structure, the sealing ring, the sealing piston, the excitation head and the cavity main structure form a reset air chamber, the sealing piston, the excitation bottom plate and the cavity main structure form an excitation air chamber, the excitation air chamber is intermittently connected to a high-pressure gas cylinder through an electromagnetic valve switch, and the arc-shaped part of the end of the excitation head is in contact with the surface of the concrete structure;
[0008] The signal acquisition system includes a sleeve rod, an articulated frame, a support arm, a counterweight, a sensor and a balance bolt. The sleeve rod is threadedly connected to the articulated frame and the counterweight in sequence from top to bottom, the counterweight is threadedly connected to the sensor, a plurality of support arms are arranged on the articulated frame, the balance bolt is arranged at the outer end of the support arm, and the signal excitation system is arranged on the counterweight via a bracket.
[0009] Optionally, an air pipe opening is provided on the outer side of the cavity main structure corresponding to the exciting air chamber, and the air pipe opening is connected to the exciting air chamber, and the high-pressure gas cylinder is intermittently connected to the air pipe opening through a solenoid valve.
[0010] Optionally, the signal acquisition system and the signal excitation system are connected via wire.
[0011] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the system for measuring internal defects of underwater concrete structures provided by the present invention comprises a signal excitation system and a signal acquisition system, wherein the signal excitation system controls the high-pressure gas cylinder to inject compressed air into the excitation air chamber through the opening and closing of the electromagnetic valve on the water surface, and pushes the excitation head to impact and complete the excitation, and at the same time, the air at the front end of the sealing plug is compressed (or a retraction air chamber is added to the front end) to generate pressure to return the excitation head to its original position, and the signal acquisition system comprises a sleeve rod, an articulated frame, a support arm, a counterweight, a sensor and a balance bolt, which can be stably fixed on the underwater concrete surface under the action of the gravity of the counterweight, and the number of counterweights can be increased to enhance stability in places with large water flow velocity, and the entire system can reasonably adjust the operating diameter of the entire system according to the size of the object to be measured by adjusting the angle between the support arm and the surface of the detection object, thereby effectively completing the triggering and acquisition of the underwater concrete quality detection excitation signal, filling the gap in the data acquisition method of the impact elastic wave detection technology in the field of underwater concrete quality detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0013] Figure 1 This is a system block diagram of measuring internal defects of underwater concrete structures according to an embodiment of the present invention;
[0014] Figure 2 This is a schematic diagram of the system structure for measuring internal defects of underwater concrete structures according to an embodiment of the present invention;
[0015] Figure 3 It is a schematic diagram of the signal excitation system structure;
[0016] Figure 4 This is a schematic diagram of the signal acquisition system structure.
[0017] Figure numerals: 1. cavity main structure; 2. excitation head; 3. reset air chamber; 4. excitation base plate; 5. sealing ring; 6. sealing piston; 7. excitation air chamber; 8. air pipe port; 9. sleeve rod; 10. articulated frame; 11. support arm; 12. counterweight; 13. sensor or camera; 14. balance bolt; 15. signal excitation system; 16. signal acquisition system. DETAILED DESCRIPTION
[0018] The purpose of the present invention is to provide a system for measuring internal defects of underwater concrete structures, which can quickly, effectively and automatically complete the excitation and signal acquisition of impact elastic wave detection technology in underwater concrete quality detection, filling the gap in data acquisition methods in the field of underwater concrete detection using impact elastic wave detection technology.
[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] like Figure 1 and Figure 2 As shown, the system for measuring internal defects of underwater concrete structures provided by the embodiment of the present invention includes: a signal excitation system 15 and a signal acquisition system 16, wherein the signal excitation system 15 is arranged on one side of the signal acquisition system 16, and the two are connected by threads, the signal excitation system 15 is used to generate a vibration signal, and the signal acquisition system 16 is used to collect the vibration signal and self-fix the entire detection system;
[0021] like Figure 3As shown, the signal excitation system 15 includes a cavity main body structure 1, an excitation head 2, a sealing piston 6 and an excitation bottom plate 4, the cavity main body structure 1 is arranged on the excitation bottom plate 4, the excitation head 2 is arranged inside the cavity main body structure 1, and the excitation head 2 is assembled with the cavity main body structure 1 by interference fit, the excitation head 2 is arranged with a groove, the groove has a maximum stroke limit effect on the excitation head 2, the sealing ring 5 is arranged between the head inner wall of the cavity main body structure 1 and the groove, the tail of the excitation head 2 is a T-shaped structure, and the excitation The sealing piston 6 is arranged between the tail of the head 2 and the inner wall of the cavity main structure 1, the sealing ring 5, the sealing piston 6, the excitation head 2 and the cavity main structure 1 form a reset air chamber 3, the sealing piston 6, the excitation bottom plate 4 and the cavity main structure 1 form an excitation air chamber 7, the excitation air chamber 7 can be intermittently connected to the high-pressure gas cylinder through the solenoid valve switch, the arc part of the end of the excitation head 2 is in contact with the surface of the concrete structure, wherein the diameter of the sealing piston 6 is slightly larger than the diameter of the excitation head, so as to achieve the function of limiting and separating the excitation air chamber 7 and the reset air chamber 3;
[0022] There is air in both the reset air chamber and the exciting air chamber. In the initial state, the internal air pressure is equal to the external air pressure.
[0023] The working principle of the signal excitation system 15 is as follows: the high-pressure gas cylinder injects a certain amount of compressed air into the exciting air chamber 7 through the air pipe in a very short time through the opening and closing of the electromagnetic valve. Under the action of the transient expansion of the compressed air, the compressed air pushes the exciting head 2 to complete a transient striking (forward) action. During the action of the exciting head 2, the reset air chamber is in a sealed state. After the exciting head 2 starts to move, the air inside the reset air chamber 3 is compressed by the exciting head 2, and the air pressure becomes larger. After the exciting head 2 moves to the extreme position, the air pressure in the reset air chamber 3 reaches the maximum. At this time, the air pressure in the reset air chamber 3 is greater than that of the exciting head 2. The air pressure in the vibration chamber 7 increases, and the vibration head 2 starts to move back. During the movement of the vibration head 2 back, the air pressure in the vibration chamber 7 gradually increases, and the air pressure in the reset chamber 3 gradually decreases. When the air pressure in the reset chamber 3 is balanced or the same as that in the vibration chamber 7, the vibration head 2 no longer moves, and the entire vibration system completes a complete vibration and reset action. The unique pneumatic structure design of the signal excitation system makes full use of the characteristics of the air medium to complete the triggering and resetting of the vibration signal. The structural retraction characteristic can effectively avoid secondary excitation and maximize the avoidance of the generation of messy vibration signals that affect the judgment of the test personnel.
[0024] like Figure 4As shown, the signal acquisition system 16 includes a sleeve rod 9, an articulated frame 10, a support arm 11, a counterweight 12, a sensor 13 and a balance bolt 14. The sleeve rod 9 is threadedly connected to the articulated frame 10 and the counterweight 12 from top to bottom in sequence. The counterweight 12 is threadedly connected to the sensor 13. The sensor 13 is an ICP sensor and can also be replaced by an underwater camera. A plurality of groups of support arms 11 are arranged on the articulated frame 10. The balance bolt 14 is arranged at the outer end of the support arm 11. The signal excitation system is arranged on the counterweight 12 through a bracket.
[0025] The sleeve rod 9 is a stainless steel rod with a length of about 1.2m. The rod body connects the main body of the entire system, is hollow on the top and solid on the bottom, and has a wire entry hole at the bottom of the hollow inner cavity to facilitate the entry and exit of the signal line of the sensor or camera, standardize the layout of the signal line, and prevent the signal lines from being entangled with each other;
[0026] The sleeve rod 9 and the articulated frame 10 are connected by threads, and the relative position between the sleeve rod 9 and the articulated frame 10 can be adjusted according to on-site requirements;
[0027] The support arm 11 adopts a hollow structure to reduce its own weight, and the sleeve rod 9 is connected to the support arm 11 by riveting;
[0028] The exposed length of the balance bolt 14 can be adjusted according to the needs, and can adapt to the working conditions with poor flatness;
[0029] The signal acquisition system 16 can be stably fixed on the underwater concrete surface under the action of the gravity of the counterweight block 12. In places where the water flow rate is large, the number of counterweight blocks 12 can be increased to enhance stability. The entire system can reasonably adjust the operating diameter of the entire system by adjusting the angle between the support arm 11 and the detection object surface according to the size of the object to be measured;
[0030] The entire concrete quality detection system is placed in the water area to be tested. The entire detection system will sink to the underwater concrete surface to be tested under the action of gravity. The surface of the test object is observed through the underwater camera on the system, and the sensor part is placed on the measuring point. If the underwater concrete test surface is uneven, the balance bolt 14 can be adjusted to fix it; the surface of the excitation system in contact with the underwater concrete should not be too close to the concrete boundary. After the entire detection system is placed, press the solenoid valve control switch, the excitation system starts to vibrate, and the signal acquisition system picks up the elastic wave vibration signal on the concrete through the front-end acceleration sensor, thereby completing the entire underwater concrete quality detection.
[0031] The acquisition system and the excitation system can work normally in a complex environment with a high water pressure of at least 8m.
[0032] The acquisition system and the excitation system are connected by wire, and the test personnel can realize the excitation and acquisition of underwater signals by button control on the water surface.
[0033] The present invention provides a system for measuring internal defects of underwater concrete structures, which includes a signal excitation system and a signal acquisition system, wherein the signal excitation system controls the high-pressure gas cylinder to inject compressed air into the excitation air chamber through the opening and closing of the electromagnetic valve on the water surface, so as to push the excitation head to impact and complete the excitation, and at the same time, the air at the front end of the sealing plug is compressed (or a retraction air chamber is added to the front end) to generate pressure to return the excitation head to its original position, and the signal acquisition system includes a sleeve rod, an articulated frame, a support arm, a counterweight, a sensor and a balance bolt, and can be stably fixed on the underwater concrete surface under the action of the gravity of the counterweight, and the number of counterweights can be increased in places where the water flow rate is large to enhance stability, and the whole system can reasonably adjust the operating diameter of the whole system according to the size of the object to be measured by adjusting the angle between the support arm and the surface of the detection object, thereby effectively completing the triggering and acquisition of the underwater concrete quality detection excitation signal, filling the gap in the data acquisition method of the impact elastic wave detection technology in the field of underwater concrete quality detection.
[0034] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A system for measuring internal defects of underwater concrete structures, characterized in that: include: A signal excitation system and a signal acquisition system, wherein the signal excitation system is arranged on one side of the signal acquisition system and the two are connected by threads, the signal excitation system is used to generate a vibration signal, and the signal acquisition system is used to collect the vibration signal and self-fix the entire system; The signal excitation system includes a cavity main structure, an excitation head, a sealing piston and an excitation bottom plate, the cavity main structure is arranged on the excitation bottom plate, the excitation head is arranged inside the cavity main structure, and the excitation head and the cavity main structure are assembled with interference fit, the excitation head is arranged with a groove, the groove is used to limit the maximum stroke of the excitation head, the sealing ring is arranged between the inner wall of the head of the cavity main structure and the groove, the tail of the excitation head is a T-shaped structure, the sealing piston is arranged between the tail of the excitation head and the inner wall of the cavity main structure, the sealing ring, the sealing piston, the excitation head and the cavity main structure form a reset air chamber, the sealing piston, the excitation bottom plate and the cavity main structure form an excitation air chamber, the excitation air chamber is intermittently connected to a high-pressure gas cylinder through an electromagnetic valve switch, and the arc-shaped end portion of the excitation head is in contact with the surface of the concrete structure; The signal acquisition system includes a sleeve rod, an articulated frame, a support arm, a counterweight, a sensor and a balance bolt. The sleeve rod is threadedly connected to the articulated frame and the counterweight in sequence from top to bottom, the counterweight is threadedly connected to the sensor, a plurality of support arms are arranged on the articulated frame, the balance bolt is arranged at the outer end of the support arm, and the signal excitation system is arranged on the counterweight via a bracket.
2. The system for measuring internal defects of underwater concrete structures according to claim 1, characterized in that: An air pipe opening is provided on the outer side of the cavity main structure corresponding to the exciting air chamber, and the air pipe opening is connected to the exciting air chamber, and the high-pressure gas cylinder is intermittently connected to the air pipe opening through an electromagnetic valve switch.
3. The system for measuring internal defects of underwater concrete structures according to claim 1, characterized in that: The signal acquisition system is connected to the signal excitation system via wires.