Experimental device for mechanical loading and leakage monitoring of L-shaped elbow joint of water supply pipeline

Abstract

The invention relates to the field of pipeline performance testing, and particularly discloses an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline, which comprises a testing pipeline, a pipe end fixing device, a pipe section fixing device, a water pressure loading device, a pipeline deformation testing device and a leakage monitoring device. The device can synchronously monitor the bending moment, the rotating angle and the water leakage amount in the bending process of the L-shaped elbow joint in real time, simulates the actual working condition, and has high-precision measurement and universality. The device provided by the invention overcomes the defects in the prior art, provides a comprehensive means for comprehensive performance evaluation of a water supply pipeline joint, can dynamically monitor the mechanical property and leakage flow change of the joint, provides key data for aseismic design and maintenance strategy optimization of a water supply pipe network, improves the leakage monitoring efficiency and accuracy, and has flexibility and universality.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline performance testing, in particular to an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline. Background Art

[0002] As a key component of urban water supply systems, the performance of water supply pipelines is directly related to the safety and reliability of water supply. In daily urban operations, water supply pipelines are like the lifeblood of a city. Failures in these pipelines can have a ripple effect on residents' lives, industrial production, and other aspects, causing numerous problems. Pipeline joints are particularly vulnerable links in the entire network. In the face of natural disasters such as earthquakes, or during long-term service, the mechanical properties of these joints can easily degrade, leading to problems such as leakage. These problems not only waste water resources but also pose a potential threat to other urban infrastructure.

[0003] As a common form of water supply pipeline connection, L-type joints are widely used in practical applications. Testing of their mechanical properties is of great significance for evaluating the overall performance and reliability of water supply pipelines. By testing the mechanical properties of joints, the mechanical characteristics of the pipeline can be clarified and potential safety hazards can be discovered, thus providing a scientific basis for pipeline maintenance and replacement. However, current research on water supply pipelines mainly focuses on straight pipelines, and there is relatively little research on L-type pipelines. The research focus of straight pipelines is on the mechanical properties and leakage model of joints. Common methods include theoretical analysis, experimental testing and finite element simulation. However, these research methods and experimental devices are often not directly applicable to the testing of L-type pipelines, resulting in a lag in the research on the mechanical properties and leakage performance of L-type pipelines.

[0004] At the same time, existing testing experiments for water supply pipeline joints typically focus solely on the joint's mechanical properties, such as tensile strength and stiffness, while neglecting the quantitative analysis of leakage performance. For example, some experimental setups can only test the joint's mechanical properties without simultaneously measuring leakage flow, making it impossible to fully assess the functional changes of the joint during stress and deformation. Furthermore, existing technologies struggle to achieve real-time monitoring of the dynamic changes in the joint's mechanical properties and leakage flow during stress and deformation, failing to reflect the changing characteristics of the joint's leakage flow during bending deformation of the pipeline structure.

[0005] Moreover, in practical applications and research, the existing experimental equipment and testing methods for L-shaped joints in water supply pipelines have some shortcomings that need to be addressed urgently. When testing the mechanical properties of joints, current devices are usually carried out in a non-operating state, lacking simulation of actual working conditions and unable to accurately reflect the dynamic changes in the mechanical properties of the joints under real stress conditions. At the same time, for the key parameter of leakage flow, existing testing methods are often only able to perform discrete measurements at specific times or under specific conditions, making it difficult to achieve continuous and dynamic monitoring, resulting in an incomplete and inaccurate understanding of the changing characteristics of leakage flow.

[0006] To address these issues, developing an experimental device capable of simultaneously testing the mechanical and leakage properties of L-shaped elbow joints in water supply pipelines is of great practical significance. Comprehensive testing of the mechanical and leakage properties of L-shaped joints provides a more comprehensive understanding of their performance under actual operating conditions, providing a more accurate basis for the design, construction, and maintenance of water supply pipelines. This not only helps improve the reliability and safety of water supply pipelines but also provides technical support for the optimization and upgrading of urban water supply systems. Furthermore, the research on this experimental device and testing method will provide new ideas and methods for research in related fields, promoting the continuous development of water supply pipeline technology. Summary of the Invention

[0007] In response to the above-mentioned problems of the prior art, the present invention provides an experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines, which realizes comprehensive performance testing of L-shaped elbow joints of water supply pipelines, can simulate actual working conditions for detection, and dynamically monitor changes in joint performance, significantly improving the efficiency of leakage monitoring.

[0008] To achieve the above-mentioned objectives, the present invention proposes an experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints in water supply pipelines, comprising: a test pipeline, a pipe end fixing device, a pipe section fixing device, a water pressure loading device, a pipeline deformation testing device and a leakage monitoring device. The test pipeline is fixed by the pipe section fixing device, the water pressure loading device provides circulation and pressurization of water flow in the pipeline, the pipeline deformation device uses an actuator to apply a joint bending moment to cause strain on the pipe body and deformation of the joint, and the water flow information testing device measures the amount of water leaked during the deformation of the joint.

[0009] Preferably, the first pipeline and the second pipeline of the test pipeline are connected by an L-shaped pipeline joint.

[0010] Preferably, the pipe end fixing device consists of a first part and a second part, and the first part is welded by a first flange, a first rib, a first steel plate and a second steel plate.

[0011] Preferably, the first flange is perpendicular to the first rib, the first rib is perpendicular to the first steel plate, and the first steel plate is perpendicular to the second steel plate; the second part is formed by vertically welding the second flange and the first short pipe, the first flange and the second flange are connected by a first bolt, and one end of the first short pipe is connected to the first pipeline by a second bolt.

[0012] Preferably, the pipe section fixing device includes a third steel plate, a fourth steel plate, a fifth steel plate, stiffening ribs and fixed steel bars, the third steel plate is perpendicular to the fifth steel plate, the fourth steel plate is perpendicular to the third steel plate, the fourth steel plate and the fifth steel plate are welded and fixed, the stiffening ribs are vertically welded to the third steel plate and the fifth steel plate, and the fixed steel bars are fixed to the third steel plate by a third bolt.

[0013] Preferably, the water pressure loading device is composed of a valve, a water pipe, a water pump, and a water tank. The water pump circulates the water in the water tank in the pipeline by pumping and maintains a certain water pressure. The valve is arranged between the water pump and the pipeline.

[0014] Preferably, the pipeline deformation testing device consists of two parts, one part is the third flange and the second short tube, the third flange and the second short tube are welded, and the third flange is perpendicular to the second short tube; the other part consists of the fourth flange, the second rib, the sixth steel plate, the seventh steel plate, the wheel and the first ear.

[0015] Preferably, the sixth steel plate, the seventh steel plate and the first ear are welded, the fourth flange is perpendicular to the second rib, the wheel is connected to the seventh steel plate by a seventh bolt, the wheel is fixed by an eighth bolt, the first ear is perpendicular to the second rib, the second rib is perpendicular to the sixth steel plate, the sixth steel plate is perpendicular to the seventh steel plate, the third flange and the fourth flange are connected by a fourth bolt, and one end of the second short tube is connected by a fifth bolt.

[0016] Preferably, the actuator is provided with a second ear, and the first ear and the second ear are fixed by a sixth bolt.

[0017] Preferably, the leakage monitoring device consists of a first water pressure gauge, a second water pressure gauge, a measuring cup, a glass box, a mass scale and an acoustic sensor. The first water pressure gauge and the second water pressure gauge are respectively placed at the outlet pipe and the inlet pipe at both ends of the pipeline to test the water pressure value and record it. The three acoustic sensors are equidistantly placed on the first pipeline and the second pipeline, and two acoustic sensors are placed on the L-shaped pipeline joint.

[0018] Therefore, the present invention proposes an experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints in water supply pipelines, which has the following beneficial effects:

[0019] (1) The present invention realizes the simultaneous testing of the mechanical properties and leakage performance of the joint, which makes up for the shortcomings of the existing technology and provides a more comprehensive means for the comprehensive performance evaluation of the water supply pipeline joint.

[0020] (2) The device of the present invention is versatile and flexible, and can test pipes of different diameters and materials. It is widely used in the research and evaluation of various pipeline systems. It can simulate actual working conditions for testing, providing a more accurate basis for the design, construction and maintenance of water supply pipelines.

[0021] (3) The present invention reveals the intrinsic relationship between the mechanical performance parameters and functional parameters of pipeline joints through dynamic monitoring, provides key data support for the seismic design of water supply networks, improves the efficiency of leakage monitoring, and realizes the rapid discovery of leakage locations through acoustic sensors and database establishment, thereby reducing water resource waste and environmental impact.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an axonometric diagram of an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline according to the present invention;

[0024] Figure 2 This is a top view of an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline according to the present invention;

[0025] Figure 3 This is a structural diagram of a pipe end fixing device of an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline according to the present invention;

[0026] Figure 4 The present invention is a structural diagram of a pipeline deformation device of an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline.

[0027] Reference numerals

[0028] 1. First pipeline; 2. Second pipeline; 3. Pipeline joint; 4. First short pipe; 5. Second flange; 6. First flange; 7. First bolt; 8. First rib; 9. First steel plate; 10. Second steel plate; 11. Second bolt; 12. Third steel plate; 13. Fourth steel plate; 14. Stiffening rib; 15. Fifth steel plate; 16. Fixed steel bar; 17. Second short pipe; 18. Third flange; 19. Fourth flange; 20. Fourth bolt; 21. Second rib ; 22. Sixth steel plate; 23. Seventh steel plate; 24. Wheel; 25. Seventh bolt; 26. Eighth bolt; 27. Fifth bolt; 28. Actuator; 29. First ear; 30. Second ear; 31. First water pressure gauge; 32. Water pipe; 33. Water tank; 34. Measuring cup; 35. Sixth bolt; 36. Third bolt; 37. Valve; 38. Water pump; 39. Second water pressure gauge; 40. Glass box; 41. Mass scale; 42. Acoustic sensor. DETAILED DESCRIPTION

[0029] To make the technical solutions, advantages, and purposes of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The described embodiments are part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0031] like Figures 1-4 As shown, according to one embodiment of the present invention, an experimental device for mechanical loading and leakage monitoring of an L-shaped elbow joint of a water supply pipeline is provided, comprising: a test pipeline, a pipe end fixing device, a pipe section fixing device, a water pressure loading device, a pipeline deformation testing device and a leakage monitoring device. The test pipeline is fixed by the pipe section fixing device, the water pressure loading device provides circulation and pressurization of the water flow in the pipeline, the pipeline deformation device uses an actuator to apply a joint bending moment to cause strain on the pipe body and deformation of the joint, and the water flow information testing device measures the amount of water leaked during the deformation of the joint.

[0032] The test pipeline includes a first pipeline 1 , a second pipeline 2 and an L-shaped pipeline joint 3 .

[0033] The pipe end fixing device consists of a first part and a second part. The first part is formed by welding a first flange 6, a first rib 8, a first steel plate 9 and a second steel plate 10.

[0034] The first flange 6 is perpendicular to the first rib 8 , the first rib 8 is perpendicular to the first steel plate 9 , and the first steel plate 9 is perpendicular to the second steel plate 10 .

[0035] The second part is formed by vertically welding the second flange 5 and the first short pipe 4. The first flange 6 and the second flange 5 are connected by a first bolt 7. One end of the first short pipe 4 is connected to the first pipeline 1 by a second bolt 11.

[0036] The pipe section fixing device includes a third steel plate 12 , a fourth steel plate 13 , a fifth steel plate 15 , stiffening ribs 14 and fixing steel bars 16 .

[0037] The third steel plate 12 is perpendicular to the fifth steel plate 15 , the fourth steel plate 13 is perpendicular to the third steel plate 12 , the fourth steel plate 13 and the fifth steel plate 15 are welded and fixed, the stiffening ribs are vertically welded to the third steel plate 12 and the fifth steel plate 15 , and the fixing steel bars 16 are fixed to the third steel plate 12 by third bolts 36 .

[0038] During installation, first loosen the third bolt 36 , then hang the test pipe onto the fourth steel plate 13 , fix the steel bar to the pipe, and then tighten the third bolt 36 to ensure it is fully fixed.

[0039] The hydraulic loading device consists of a valve 37, a water pipe 32, a water pump 38, and a water tank 33. The water pump 38 circulates the water in the water tank 33 in the pipeline by pumping and maintains a certain water pressure. The valve 37 is arranged between the water pump 38 and the pipeline 32.

[0040] The pipeline deformation testing device consists of two parts. One part is the third flange 18 and the second short tube 17. The third flange 18 and the second short tube 17 are welded, and the third flange 18 is perpendicular to the second short tube 17. The other part consists of the fourth flange 19, the second rib 21, the sixth steel plate 22, the seventh steel plate 23, the wheel 24 and the first ear 29.

[0041] The sixth steel plate 22, the seventh steel plate 23 and the first ear 29 are welded, the fourth flange 19 is perpendicular to the second rib 21, the wheel 24 is connected to the seventh steel plate 23 by the seventh bolt 25, the wheel 24 is fixed by the eighth bolt 26, the first ear 29 is perpendicular to the second rib 21, the second rib 21 is perpendicular to the sixth steel plate 22, the sixth steel plate 22 is perpendicular to the seventh steel plate 23, the third flange 18 and the fourth flange 19 are connected by the fourth bolt 20, and one end of the second short tube 17 is connected by the fifth bolt 27.

[0042] The actuator is provided with a second ear 30 , and the first ear 29 and the second ear 30 are fixed by a sixth bolt 35 .

[0043] The leakage monitoring device consists of a first water pressure gauge 31, a second water pressure gauge 39, a measuring cup 34, a glass box 40, a mass scale 41 and an acoustic sensor 42. The first water pressure gauge 31 and the second water pressure gauge 39 are respectively placed at the outlet pipe and the inlet pipe at both ends of the pipeline to test the water pressure value and record it. The three acoustic sensors 42 are placed equidistantly on the first pipeline 1 and the second pipeline 2. Two acoustic sensors 42 are placed on the L-shaped pipeline joint 3 to test the acoustic signals generated by leakage monitored at different positions.

[0044] The acoustic signals generated by the test can be converted into digital signals by a data acquisition unit (DAQ), providing data for subsequent pipeline leak monitoring. By collecting and analyzing these digital signals, a leak database can be established. This database can be disseminated and shared to identify leak locations, improve the efficiency and accuracy of leak monitoring, and reduce water waste and environmental impact.

[0045] The measuring cup 34 is used to collect the leaked water, the glass box 40 is used to guide the water sprayed after the pipeline fails into the measuring cup, the mass scale 41 is used to measure the amount of sprayed water, and the acoustic sensor 42 is used to test the acoustic signals generated by the leakage monitored at different positions.

[0046] After the experimental device is installed, water is passed through it to ensure that there is no water leakage under constant water pressure. The installation of the experimental device is then complete.

[0047] Therefore, the present invention provides an experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines. Through the movable design, the comprehensive performance test of L-shaped elbow joints of water supply pipelines is realized. It has versatility and flexibility, can simulate actual working conditions for detection, and dynamically monitor changes in joint performance, while significantly improving the efficiency of leakage monitoring.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints in water supply pipelines, characterized in that: It includes a test pipeline, a pipe end fixing device, a pipe section fixing device, a water pressure loading device, a pipeline deformation testing device and a leakage monitoring device. The test pipeline is fixed by the pipe section fixing device. The water pressure loading device provides circulation and pressurization of water flow in the pipeline. The pipeline deformation device uses an actuator to apply joint bending moment to cause strain on the pipe body and deformation of the joint. The water flow information testing device measures the amount of water leaked during the joint deformation process.

2. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The first pipeline and the second pipeline of the test pipeline are connected by an L-shaped pipeline joint.

3. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The pipe end fixing device consists of a first part and a second part. The first part is formed by welding a first flange, a first rib plate, a first steel plate and a second steel plate.

4. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 3 is characterized in that: The first flange is perpendicular to the first rib, the first rib is perpendicular to the first steel plate, and the first steel plate is perpendicular to the second steel plate; the second part is formed by vertically welding the second flange and the first short pipe, the first flange and the second flange are connected by a first bolt, and one end of the first short pipe is connected to the first pipeline by a second bolt.

5. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The pipe section fixing device includes a third steel plate, a fourth steel plate, a fifth steel plate, stiffening ribs and fixed steel bars. The third steel plate is perpendicular to the fifth steel plate, the fourth steel plate is perpendicular to the third steel plate, the fourth steel plate and the fifth steel plate are welded and fixed, the stiffening ribs are vertically welded to the third steel plate and the fifth steel plate, and the fixed steel bars are fixed to the third steel plate by a third bolt.

6. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The water pressure loading device is composed of a valve, a water pipe, a water pump, and a water tank. The water pump circulates the water in the water tank in the pipeline by pumping and maintains a certain water pressure. The valve is arranged between the water pump and the pipeline.

7. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The pipeline deformation testing device consists of two parts, one part is the third flange and the second short pipe, the third flange and the second short pipe are welded, and the third flange is perpendicular to the second short pipe; the other part consists of the fourth flange, the second rib, the sixth steel plate, the seventh steel plate, the wheel and the first ear.

8. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 7 is characterized in that: The sixth steel plate, the seventh steel plate and the first ear are welded, the fourth flange is perpendicular to the second rib, the wheel is connected to the seventh steel plate by the seventh bolt, the wheel is fixed by the eighth bolt, the first ear is perpendicular to the second rib, the second rib is perpendicular to the sixth steel plate, the sixth steel plate is perpendicular to the seventh steel plate, the third flange and the fourth flange are connected by the fourth bolt, and one end of the second short tube is connected by the fifth bolt.

9. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1 is characterized in that: The actuator is provided with a second ear, and the first ear and the second ear are fixed by a sixth bolt.

10. The experimental device for mechanical loading and leakage monitoring of L-shaped elbow joints of water supply pipelines according to claim 1, characterized in that: The leakage monitoring device consists of a first water pressure gauge, a second water pressure gauge, a measuring cup, a glass box, a mass scale and an acoustic sensor. The first water pressure gauge and the second water pressure gauge are respectively placed at the water outlet pipe and the water inlet pipe at both ends of the pipeline to test the water pressure value and record it. The three acoustic sensors are equidistantly placed on the first pipeline and the second pipeline, and two acoustic sensors are placed on the L-shaped pipeline joint.

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