Closed water test method and device

Abstract

The invention provides a closed water test method and device, and relates to the field of pipeline water leakage detection. The closed water test method comprises the following steps: pre-installing a host and an ultrasonic probe to form a machine body; the machine body is installed at the opening of the inspection well in an erecting or hoisting mode, and the installation position of the machine body is calibrated; sealing the drainage pipeline; injecting quantitative water from the opening of the inspection well; closing the inspection well; the ultrasonic probe detects the water level in real time; and the detection data are analyzed to judge whether water leaks or not. The sealed drainage pipeline is detected through the machine body, interference of the effect can be evaporated, the detection precision is improved, the ultrasonic probe is adopted for monitoring the water level in real time, real-time monitoring can be achieved without opening a well lid, and the detection efficiency can be better improved.

Description

Technical Field

[0001] The present application relates to the field of pipeline leakage detection, and in particular to a closed water test method and device. Background Art

[0002] After the pipeline laying project of the gravity flow sewage collection network is completed, a non-pressure pipeline closed water test must be carried out in accordance with the specifications to verify whether the sealing performance of the pipeline meets the project acceptance standards.

[0003] A prior art device for testing water tightness in drainage pipes is disclosed. This device primarily consists of a drainage pipe, sealing plugs at both ends, and a top inspection well. The inspection well houses a float with a graduated rod, topped with a crossbar support structure and connected to an external measuring container via a flexible hose. This technical solution uses the float-rod system to record water level depth, thereby obtaining pipeline seepage data. This advantageous feature allows water level measurement to be performed without requiring personnel to descend into the well.

[0004] Traditional water-tightness test methods mainly rely on manual water injection, visual observation of water levels, or simple sensor monitoring, which have the following technical defects: 1. Measurement accuracy issues: Manual readings are subject to significant errors, and water level data is easily affected by evaporation, often leading to misjudgment of leakage. 2. Detection efficiency issues: The manhole cover needs to be opened repeatedly for inspection, the operation process is complicated, and the overall detection cycle is too long. Summary of the Invention

[0005] The purpose of this application is to provide a closed water test method and device, which can reduce the interference of evaporation effect, improve detection accuracy, and realize real-time monitoring without opening the manhole cover, thereby improving detection efficiency.

[0006] In a first aspect, the present invention provides a water-tightness test method, the water-tightness test method comprising: The main unit and ultrasonic probe are pre-installed to form the main body; Install the machine body to the opening of the inspection well by means of rack mounting or hoisting, and use a laser level to calibrate the installation position of the machine body so that the ultrasonic probe is located on the central axis of the inspection well; Insert plugs at both ends of the drainage pipe and seal them; Inject a fixed amount of water from the opening of the inspection well; sealing the opening of the inspection well; The ultrasonic probe detects the water level in real time and displays it on the host; Analyze the detection data to determine whether there is a water leak.

[0007] In an optional embodiment, the ultrasonic probe transmits ultrasonic waves in a vertical direction.

[0008] In an optional embodiment, in the step of inserting the plug, the plug is first manually pre-installed to a preset depth of the port, and then pressed in multiple times using a hydraulic tool.

[0009] In an optional embodiment, silicone-based grease is applied to the surface of each sealing ring, and then the plurality of sealing rings are installed on the plug.

[0010] In an optional embodiment, the water level reference of the quantitative water is: the distance from the water level surface to the top surface of the inspection well is 50 mm ± 2 mm.

[0011] In an optional embodiment, the water injection volume is calculated as follows: V=πR²H×1.05, where R is the radius of the drainage pipe and H is the length between the two plugs.

[0012] In an optional embodiment, when the host is pre-installed, two sets of sealing components are installed on the lower surface of the host, and the driving member of each set of sealing components drives a top cover to move. Under the action of their respective driving members, the two top covers close to seal the opening of the inspection well.

[0013] In an optional embodiment, the ultrasonic probe is set to a three-level detection mode: Initial inspection stage (0-2h): data is collected every 10 seconds; Steady-state phase (2-24h): data were collected every 5 minutes; Final inspection phase (24-30 hours): data is collected every 15 minutes.

[0014] In an optional embodiment, the basis for determining water leakage is the absolute leakage amount, and the calculation formula is: Δh≥h0×0.5%, where h0 is the initial water level.

[0015] In the second aspect, the present invention provides a water-tightness test device for implementing the water-tightness test method described in the aforementioned embodiment, wherein the water-tightness test device includes a body and a sealing assembly, wherein the body includes a host and an ultrasonic probe, wherein the ultrasonic probe is connected to the host via a cable, and wherein the sealing assembly includes a plug, which is adapted to the port of the drainage pipe.

[0016] Compared with the prior art, the present invention has the following advantages: This application uses the machine body to detect sealed drainage pipes, which can reduce the interference of evaporation effect and improve detection accuracy. This application also uses an ultrasonic probe to monitor the water level in real time, which can achieve real-time monitoring without opening the manhole cover, and can further improve detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Shows a schematic structural diagram of a closed water test device in some embodiments; Figure 2 Shown Figure 1 Enlarged view of part A in the middle; Figure 3 Another structural schematic diagram of a closed water test device in some embodiments is shown; Figure 4 Another structural schematic diagram of the closed water test device in some embodiments is shown (some elements are omitted).

[0019] Description of main component symbols: 10-Water-tightness test device; 100-Body; 110-Host; 111-Digital display screen; 120-Ultrasonic probe; 130-Cable; 200-Sealing assembly; 210-Plug; 220-Driver; 230-Connector; 240-Top cover; 300-Installation assembly; 310-Installation part; 320-Fasten ring; 321-Sub-ring; 20-Drainage pipe; 30-Inspection well. DETAILED DESCRIPTION

[0020] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0023] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0024] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0025] See also Figure 1 This embodiment is used for the closed water test of the drainage pipe 20 and is suitable for pipeline acceptance and maintenance inspection in the fields of municipal water supply, petrochemical industry, sewage treatment, etc. It can replace the traditional manual inspection method and realize efficient and high-precision automated operation.

[0026] Taking the horizontal drainage pipe 20 as an example, an inspection well 30 is provided above the drainage pipe 20 . The inspection well 30 extends in a vertical direction, and the inspection well 30 and the drainage pipe 20 form a three-way structure.

[0027] This embodiment provides a closed water test method, which includes the following steps: S100 . Pre-install the host 110 and the ultrasonic probe 120 to form the body 100 .

[0028] See also Figure 1 and Figure 2In this embodiment, a host computer 110 and an ultrasonic probe 120 are connected via a cable 130. The host computer 110 is provided with a digital display screen 111. The ultrasonic probe 120 is used to measure the water level inside the drainage pipe 20 and transmit the detected value to the host computer 110 via the cable 130, and display it on the digital display screen 111.

[0029] Since the cable 130 has insufficient bearing capacity and is easily broken due to excessive stretching, a mounting assembly 300 needs to be provided between the host 110 and the ultrasonic probe 120 .

[0030] The mounting part 310 of the mounting assembly 300 is fixedly connected to the main unit 110 and the split ring 321 respectively, the ultrasonic probe 120 is placed between the two split rings 321, and then the two split rings 321 are fastened with bolts to achieve pre-installation of the ultrasonic probe 120 and the main unit 110.

[0031] See also Figure 3 When the host 110 is pre-installed, two sets of blocking components 200 are installed on the lower surface of the host 110. The driving member 220 of each set of blocking components 200 drives a top cover 240 to move. Under the action of their respective driving members 220, the two top covers 240 are closed to seal the opening of the inspection well 30.

[0032] In this embodiment, two groups of sealing components 200 are arranged opposite to each other, the driving member 220 is an electric cylinder, and a connecting member 230 is provided between the top cover 240 and the electric cylinder. The piston rod of the electric cylinder extends to drive the connecting member 230 to move, thereby driving the top cover 240 to move. Therefore, when it is necessary to close the top cover 240, the two top covers 240 are controlled to move toward each other and close together. When it is necessary to open the top cover 240, the two top covers 240 are controlled to move away from each other.

[0033] See also Figure 2 and Figure 3 It can be understood that the ultrasonic probe 120 needs to be inserted into the inspection well 30 in order to realize real-time monitoring of the water level. Correspondingly, the top cover 240 is provided with a through hole, which is adapted to the ultrasonic probe 120. On the premise of ensuring that the ultrasonic probe 120 can be inserted, the exposed area of ​​the opening is minimized to avoid detection data errors caused by interference from the evaporation effect.

[0034] Please continue reading Figure 1 .

[0035] S200 . Install the body 100 to the opening of the inspection well 30 by means of rack mounting or hoisting, and calibrate the installation position of the body 100 using a laser level so that the ultrasonic probe 120 is located on the central axis of the inspection well 30 .

[0036] Calibration can be achieved using a reference template. For example, a reference template with the same size as the wellhead is set at the wellhead of the inspection well 30, and then the center is marked on the reference template. The center is located on the central axis of the inspection well 30. Finally, a laser level is used for calibration.

[0037] The position of the calibrated ultrasonic probe 120 is the optimal detection position for the closed water test, ensuring that the values ​​are accurate and valid.

[0038] S300. Insert plugs 210 into both ends of the drainage pipe 20 and seal them.

[0039] First, apply silicone-based grease to the surface of each sealing ring, and then install multiple sealing rings on the plug 210. Then, the plug 210 is manually pre-installed to a preset depth of the port, and then pressed in multiple times using a hydraulic tool.

[0040] It is understandable that both the sealing ring and the silicone-based grease can improve the sealing performance of the plug 210 and ensure the accuracy of the data of the water-tightness test.

[0041] The above-mentioned preset depth can be set to 20 mm, that is, after pre-installation, the plug 210 enters the drainage pipe 20, and the distance between the plug 210 and the port is 20 mm.

[0042] In this embodiment, three times of pressing are taken as an example. The operator uses a hydraulic tool to press in three times at a pressure of 0.5 MPa. At this time, the plug 210 is pressed deeper than when pre-installed. For example, a total of 10 mm is pressed in three times, and the pressing depth is 30 mm.

[0043] After the plug 210 is pressed in, the drainage pipe 20 can be subjected to a pressure test. For example, 0.5 MPa air pressure is filled into the inspection well 30. If the pressure drop is ≤3% within 5 minutes, it is determined that the sealing of the plug 210 is good and the test can continue. If the sealing is poor, the plug 210 needs to be replaced.

[0044] For ease of description and understanding, only part of the drainage pipe 20 is illustrated in the drawings, and the drainage pipe 20 on the other side of the plug 210 is omitted.

[0045] S400. Inject a fixed amount of water from the opening of the inspection well 30.

[0046] The water level reference of the quantitative water is: the distance from the water level surface to the top surface of the inspection well 30 is 50mm±2mm.

[0047] The calculation formula for the water injection volume is: V=πR²H×1.05, where R is the radius of the drainage pipe 20 and H is the length between the two plugs 210.

[0048] For example: V = 3.14 × (0.1m)² × 10m × 1.05 ≈ 330L S500. Close the opening of the inspection well 30.

[0049] See also Figures 1 to 3 After the water injection is completed, this embodiment realizes automatic capping through the blocking component 200, which reduces the interference of the evaporation effect and has a high degree of automation.

[0050] The steps of automatic capping are as follows: start two electric cylinders to control the two top covers 240 to move toward each other and close. Here, the two electric cylinders can be controlled simultaneously by one control button, or the two electric cylinders can be controlled separately by two control buttons.

[0051] The stroke of the electric cylinder is set to L=1.2×0.2m=240mm, and the closing time of the top cover 240 is ≤5 seconds.

[0052] After sealing, the ultrasonic probe 120 fits tightly with the through hole, reducing air circulation and achieving an evaporation inhibition rate of ≥90%. In addition, in this embodiment, the gap between the top cover 240 and the wellhead can be set to ≤0.5mm to prevent external contamination.

[0053] S600 . The ultrasonic probe 120 detects the water level in real time and displays it on the host 110 .

[0054] In actual use, the ultrasonic probe 120 is powered by mains electricity and is equipped with overload protection (threshold 120% rated thrust).

[0055] The ultrasonic probe 120 transmits ultrasonic waves in a vertical direction.

[0056] The ultrasonic probe 120 is set to three-level detection mode: Initial inspection stage (0-2h): data is collected every 10 seconds; Steady-state phase (2-24h): data were collected every 5 minutes; Final inspection phase (24-30 hours): data is collected every 15 minutes.

[0057] In the above example, the sampling interval is relatively short during the initial inspection phase, and increases in the steady-state phase and final inspection phases. Intensive sampling during the initial inspection phase allows leaks to be detected as quickly as possible, allowing test personnel to take timely action. If the initial inspection is normal, the sampling interval can be appropriately extended during the steady-state phase and final inspection phase. This arrangement not only facilitates data analysis but also saves energy.

[0058] S700: Analyze the detection data to determine whether there is a water leak.

[0059] The basis for judging water leakage is the absolute leakage volume, and the calculation formula is: Δh≥h0×0.5%, where h0 is the initial water level.

[0060] The water level difference between the final water level and the initial water level is the above-mentioned absolute leakage amount. When the absolute leakage amount is greater than 0.5% of the initial water level, it can be determined that the drainage pipe 20 is leaking. Otherwise, the drainage pipe 20 has good sealing performance and no leakage.

[0061] During the initial inspection, a value of Δh = 1.2 mm (< h0 × 0.5% = 2.5 mm) is detected, indicating no leakage. If dh / dt = 0.3 mm / h is detected for three consecutive cycles, the system triggers an audible and visual alarm and automatically stores the abnormal data packet.

[0062] In actual use, this embodiment uses local storage and is equipped with an industrial-grade SD card to record timestamps and water level values ​​in CSV format, and synchronizes with the cloud: encrypted data packets are uploaded every 15 minutes through the 4G module. Test personnel can view them on site through the digital display screen 111 or in the cloud through a computer, and the viewing method is flexible.

[0063] The present application detects the sealed drainage pipe 20 through the body 100, which can reduce the interference of the evaporation effect and improve the detection accuracy. The present application uses an ultrasonic probe 120 to monitor the water level in real time, and real-time monitoring can be achieved without opening the manhole cover, which can further improve the detection efficiency.

[0064] In summary, this embodiment prepares for the test by deploying the machine body 100, blocking the drainage pipe 20, injecting water, and sealing the wellhead. The ultrasonic probe 120 then monitors the water level in real time. After analyzing the data, the sealing performance of the drainage pipe 20 is determined. This embodiment requires creative effort in preparing for the test of the drainage pipe 20, simplifies the test steps, and improves the accuracy of the test data.

[0065] Compared with the traditional test method, the detection efficiency of this embodiment is improved by 37.5%, shortening the 48-hour detection cycle to 30 hours.

[0066] Based on the above-mentioned water-tightness test method, this embodiment provides a water-tightness test device 10 , which includes a body 100 and a blocking assembly 200 .

[0067] The body 100 includes a main unit 110 and an ultrasonic probe 120. The ultrasonic probe 120 is connected to the main unit 110 via a cable 130. The ultrasonic probe 120 of this embodiment has high-precision water level monitoring, real-time monitoring of water level changes with an accuracy of ±0.8mm, and built-in temperature compensation. The compensation formula is: v=331.4+0.6T, where v is the speed of sound (unit, meters per second) and T is the temperature (unit, degrees Celsius).

[0068] The plugging assembly 200 includes a plug 210, which is adapted to the port of the drainage pipe 20. The plug 210 is made of rubber material and has good sealing performance.

[0069] Multiple sealing rings are provided on the plug 210. The multiple sealing rings and the plug 210 form a multi-sealing structure to prevent water leakage at the connection between the plug 210 and the drainage pipe 20, which would affect the test data. The sealing rings are made of nitrile rubber, and the interval between two adjacent sealing rings is 15mm.

[0070] The sealing assembly 200 also includes a driving member 220, a connecting member 230 and a top cover 240. The driving member 220 is configured as an electric cylinder, which is horizontally installed on the lower surface of the main unit 110. The piston rod of the electric cylinder is fixedly connected to the connecting member 230, and the connecting member 230 is connected to the top cover 240. There are two top covers 240. When the two top covers 240 are closed, they are compatible with the wellhead of the inspection well 30.

[0071] In some other embodiments, the number of the plugging assemblies 200 is three, four, or more, as long as the condition that the wellhead can be sealed after the multiple top covers 240 are closed is met.

[0072] In some embodiments, the connector 230 is connected to the top cover 240 by bolts.

[0073] In order to improve the reliability of the movement of the top cover 240, a guide rail is set on the host 110 in this embodiment, and the connecting member 230 is slidably connected to the guide rail. In this embodiment, it can also be set that the guide rail and the connecting member 230 are both made of stainless steel, which has the advantages of wear resistance and deformation resistance.

[0074] The closed water test device 10 further includes a mounting assembly 300 , which includes a mounting member 310 and a fastening ring 320 .

[0075] See also Figure 4 One end of the mounting member 310 is fixedly connected to the host 110, and the other end of the mounting member 310 is fixedly connected to the fastening ring 320. The fixed connection method of the two ends of the mounting member 310 is welding.

[0076] In this embodiment, there can be at least two mounting parts 310, and the fastening ring 320 is divided into two semicircular sub-rings 321. One mounting part 310 is set on a corresponding sub-ring 321. After the two sub-rings 321 are tightened by bolts, the ultrasonic probe 120 can be fixed in the fastening ring 320.

[0077] The closed water test device 10 provided in this embodiment has a simple structure, is easy to operate, has a high level of automation, and has a good test effect on the sealing performance of the drainage pipe 20.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A closed water test method, characterized in that: include: The main unit and ultrasonic probe are pre-installed to form the main body; Install the machine body to the opening of the inspection well by means of rack mounting or hoisting, and use a laser level to calibrate the installation position of the machine body so that the ultrasonic probe is located on the central axis of the inspection well; Insert plugs at both ends of the drainage pipe and seal them; Inject a fixed amount of water from the opening of the inspection well; sealing the opening of the inspection well; The ultrasonic probe detects the water level in real time and displays it on the host; Analyze the detection data to determine whether there is a water leak.

2. The closed water test method according to claim 1, wherein: The ultrasonic probe transmits ultrasonic waves in a vertical direction.

3. The closed water test method according to claim 1 or 2, characterized in that: In the step of inserting the plug, the plug is first manually pre-installed to a preset depth of the port, and then pressed in multiple times using a hydraulic tool.

4. The closed water test method according to claim 3, wherein: Apply silicone-based grease to the surface of each seal ring, and then install the seal rings onto the plug.

5. The closed water test method according to claim 1 or 2, characterized in that: The water level reference for quantitative water is: the distance from the water level surface to the top surface of the inspection well is 50mm±2mm.

6. The closed water test method according to claim 2, wherein: The calculation formula for water injection volume is: V=πR²H×1.05, where R is the radius of the drainage pipe and H is the length between the two plugs.

7. The closed water test method according to claim 1 or 2, characterized in that: When pre-installing the host, two sets of blocking components are installed on the lower surface of the host. The driving member of each set of blocking components drives a top cover to move. Under the action of their respective driving members, the two top covers close together to seal the opening of the inspection well.

8. The closed water test method according to claim 1 or 2, wherein: The ultrasonic probe is set to three levels of detection mode: Initial inspection stage (0-2h): data is collected every 10 seconds; Steady-state phase (2-24h): data were collected every 5 minutes; Final inspection phase (24-30 hours): data is collected every 15 minutes.

9. The closed water test method according to claim 1 or 2, wherein: The basis for judging water leakage is the absolute leakage volume, and the calculation formula is: Δh≥h0×0.5%, where h0 is the initial water level.

10. A closed water test device, characterized in that: Used to implement the closed water test method described in any one of claims 1 to 9, the closed water test device includes a body and a blocking component, the body includes a host and an ultrasonic probe, the ultrasonic probe is connected to the host via a cable, and the blocking component includes a plug, which is adapted to the port of the drainage pipe.

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