Pressure testing method for single-channel sealing pipe joint

Abstract

The invention discloses a pressure testing method for a single-channel sealing pipe joint, and belongs to the technical field of pipeline construction, and the method comprises the steps: S1, enabling a first pipe joint and a second pipe joint to be in coaxial butt joint, and enabling the joint of the first pipe joint and the second pipe joint and a sealing part to jointly define a sealing cavity; s2, a sealing clamp is connected to the outer periphery or the inner periphery of the joint of the first pipe joint and the second pipe joint in a clamped mode; s3, a connecting through hole is formed in the sealing hoop and used for communicating the sealing cavity with the outside; s4, the sealing cavity is filled with test liquid through the connecting through hole; s5, continuously pressurizing the sealing cavity through the connecting through hole, and measuring a test pressure value in the sealing cavity in real time; and S6, obtaining the pressure condition of the to-be-tested pipe system based on the leakage condition of the test liquid and the test pressure value. According to the testing method, under the condition that the to-be-tested pipe system body does not need to be damaged, pressure testing can be effectively conducted on the single-channel sealing pipe joint, cost is low, and measuring efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline construction, and particularly relates to a pressure testing method for a single - channel sealed pipe joint. Background Art

[0002] Pipe - jacking construction, as a trenchless or less - trenching pipeline laying construction technology, is applicable to projects that need to cross complex sections such as railways, highways, rivers or buildings. Concrete pipes are widely used in pipe - jacking construction due to their outstanding characteristics such as high strength, good durability and corrosion resistance.

[0003] For pipe - jacking construction, the sealing performance of concrete pipes not only concerns the construction quality and service life of the pipeline, but also directly affects the safety of pipe - jacking construction and the stability of subsequent pipeline operation. Especially in scenarios such as underwater crossing and construction in loose strata, the importance of sealing is more prominent. Concrete pipes are generally divided into two forms: single - channel sealed concrete pipes and multi - channel sealed concrete pipes. A single - channel sealed concrete pipe is only provided with one seal inside, and a multi - channel sealed concrete pipe is provided with multiple seals along its own axial direction.

[0004] In order to evaluate the sealing performance of concrete pipes in pipe - jacking construction, it is necessary to test the sealing pressure of the pipeline. However, in the existing technologies at home and abroad, there is only an internal pressure testing method for the sealing of concrete pipe joints. It mainly involves injecting liquid or gas into the concrete pipe, gradually increasing the internal pressure by using a pressure device, and using equipment such as pressure sensors to monitor the internal pressure value of the concrete pipe in real - time. During the pressurization process, observe whether there is any leakage at the sealing part of the concrete pipe, and record the pressure value when leakage first appears, so as to evaluate the performance of the concrete pipe seal under the action of internal pressure. This testing method can simulate the situation where the concrete pipe bears internal fluid pressure during actual use.

[0005] However, the above - mentioned method only focuses on the testing process of the internal pressure of concrete pipes. Currently, there is no external pressure testing method for concrete pipes. However, in actual construction, the external pressure conditions faced by concrete pipes are complex. The external pressure from rock masses and soil may cause lateral displacement, compression deformation or even local damage of the seals, and the existing internal pressure testing cannot simulate such failure modes.

[0006] Therefore, there is an urgent need for a pressure testing method for a single - channel sealed pipe joint that can effectively test both the internal and external pressures of the single - channel sealed pipe joint of the concrete pipe to meet the sealing performance evaluation of the concrete pipe. Summary of the Invention

[0007] The purpose of the present invention is to provide a pressure testing method for a single - channel sealed pipe joint to solve the technical problem in the existing technology that there is a lack of effective testing for both the internal and external pressures of the single - channel sealed pipe joint.

[0008] As described above in the concept, the technical solution adopted by the present invention is as follows:

[0009] A pressure test method for a single-channel sealed pipe joint is applied to a pipe system to be tested. The pipe system to be tested includes a first pipe joint and a second pipe joint. A seal is provided on the inner wall of the first pipe joint. The pressure test method for a single-channel sealed pipe joint includes:

[0010] S1. Coaxially dock the first pipe joint and the second pipe joint. A sealing cavity is jointly formed by enclosing the connection part of the first pipe joint and the second pipe joint and the seal; S2. Clamp a sealing clamp on the outer circumference or inner circumference of the connection part of the first pipe joint and the second pipe joint; S3. Open a connection through-hole on the sealing clamp for communicating the sealing cavity with the outside; S4. Fill the sealing cavity with a test liquid through the connection through-hole; S5. Continuously pressurize the sealing cavity through the connection through-hole and measure the test pressure value in the sealing cavity in real time; S6. Obtain the pressure condition of the pipe system to be tested based on the leakage condition of the test liquid and the test pressure value.

[0011] Preferably, when the sealing clamp is clamped on the outer circumference of the connection part of the first pipe joint and the second pipe joint, in S6, when the test liquid leaks from the inside of the pipe system to be tested, record the test pressure value at this moment, and substitute the test pressure value into a preset formula to obtain the external pressure value of the pipe system to be tested.

[0012] Preferably, when the leakage position is at the bottom of the pipe system to be tested, the preset formula is:

[0013]

[0014] When the leakage position is in the middle of the pipe system to be tested, the preset formula is:

[0015]

[0016] When the leakage position is at the top of the pipe system to be tested, the preset formula is:

[0017] P1 = P2

[0018] Wherein, P1 is the external pressure value, P2 is the test pressure value, and D1 is the outer diameter of the pipe system to be tested.

[0019] Preferably, in S6, when the test liquid leaks from the outside of the pipe system to be tested, it indicates that the sealing clamp is not sealed properly. Reinforce the sealing clamp until the test liquid does not leak from the inside of the pipe system to be tested.

[0020] Preferably, in step S6, when the test pressure value is greater than or equal to the critical pressure value, it is determined whether the test liquid in the sealing cavity leaks. If the test liquid leaks, it indicates that the external pressure condition is unqualified; otherwise, it indicates that the external pressure condition is qualified.

[0021] Preferably, two connecting through holes are provided. One of the connecting through holes is used for injecting the test liquid, and the other connecting through hole is used for discharging the air in the sealing cavity.

[0022] Preferably, in the radial cross-section of the pipeline system to be tested, the two connecting through holes are symmetrically arranged with respect to the vertical center line of the pipeline system to be tested, and an included angle of 15° is formed between the axis of each connecting through hole and the vertical center line of the pipeline system to be tested.

[0023] Preferably, in step S4, flow guide pipes are welded to the two connecting through holes respectively, and each flow guide pipe is provided with a control valve for controlling the connection or disconnection of the flow guide pipe.

[0024] Preferably, in step S5, a pressure pump is arranged on one of the flow guide pipes for continuously pressurizing the sealing cavity; a pressure gauge is arranged on the other flow guide pipe for measuring the test pressure value in the sealing cavity.

[0025] Preferably, in step S2, the sealing clamp includes two semi-circular clamp segments that can be buckled with each other and locked by locking bolts, so as to be clamped on the outer periphery of the joint of the first pipe section and the second pipe section.

[0026] Advantages of the present invention:

[0027] The pressure test method for a single - channel sealed pipe joint proposed by the present invention. First, by coaxially docking the first pipe joint and the second pipe joint, a sealing cavity is formed by surrounding the connection between the two with a seal on the inner wall of the first pipe joint, providing an operation space for the pressure test, so that the test process can simulate the actual working conditions of the inner and outer pressures borne by the sealed part of the pipe joint. Then, a sealing clamp is clamped on the outer periphery of the connection to further strengthen the sealing structure, ensuring the stability of the seal during the test and preventing the test liquid from leaking from the outer periphery of the connection between the first pipe joint and the second pipe joint and affecting the test results. A connection through - hole is opened on the sealing clamp to realize the connection between the sealing cavity and the outside, facilitating the subsequent injection of the test liquid and the application of pressure. After that, the sealing cavity is filled with the test liquid and continuously pressurized to simulate the scenario where the single - channel sealed pipe joint bears pressure in actual application. By measuring the test pressure value in the sealing cavity in real time, the pressure data borne by the pipe system to be tested can be accurately obtained. Finally, based on the test liquid leakage situation and the test pressure value, the pressure situation of the pipe system to be tested is obtained. This test method can effectively perform a pressure test on the single - channel sealed pipe joint without damaging the body of the pipe system to be tested, with low cost and high measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 6 is a flowchart of the pressure test method for a single - channel sealed pipe joint provided in Embodiment 1 of the present invention;

[0029] Figure 2 FIG. 10 is the first front view of the pipe system to be tested provided in Embodiment 1 of the present invention;

[0030] Figure 3 FIG. 14 is the second front view of the pipe system to be tested provided in Embodiment 1 of the present invention;

[0031] Figure 4 FIG. 18 is a schematic structural diagram of the pipe system to be tested provided in Embodiment 1 of the present invention;

[0032] Figure 5 FIG. 22 is the first side view of the pipe system to be tested provided in Embodiment 1 of the present invention;

[0033] Figure 6 FIG. 26 is the second side view of the pipe system to be tested provided in Embodiment 1 of the present invention;

[0034] Figure 7 FIG. 30 is the third side view of the pipe system to be tested provided in Embodiment 1 of the present invention.

[0035] In the figures:

[0036] 1. Pipe system to be tested; 11. First pipe joint; 111. Seal; 12. Second pipe joint; 13. Sealing cavity;

[0037] 2. Sealing clamp; 20. Connection through - hole; 21. Clamp section; 22. Locking bolt;

[0038] 3. Diversion pipe; 4. Control valve; 5. Pressurizing pump; 6. Pressure gauge. Specific implementation mode

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0042] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific implementation modes.

[0043] Embodiment 1

[0044] The pressure test method for a single-channel sealed pipe joint provided by the embodiment of the present invention is applied to a pipe system to be tested. The pipe system to be tested includes a first pipe joint and a second pipe joint, and a seal is provided on the inner wall of the first pipe joint.

[0045] See Figures 1 to 7, the pressure test method for single - channel sealed pipe sections provided by the embodiments of the present invention includes: S1. Coaxially dock the first pipe section 11 with the second pipe section 12, and a sealing cavity 13 is jointly enclosed by the connection part of the first pipe section 11 and the second pipe section 12 and the seal 111; S2. Clamp a sealing clamp 2 on the outer periphery of the connection part of the first pipe section 11 and the second pipe section 12; S3. Open a connection through - hole 20 on the sealing clamp 2 for communicating the sealing cavity 13 with the outside; S4. Fill the sealing cavity 13 with test liquid through the connection through - hole 20; S5. Continuously pressurize the sealing cavity 13 through the connection through - hole 20 and measure the test pressure value in the sealing cavity 13 in real time; S6. Obtain the pressure condition of the pipe system 1 to be tested based on the leakage situation of the test liquid and the test pressure value.

[0046] The pressure test method for single - channel sealed pipe sections proposed by the present invention. First, by coaxially docking the first pipe section 11 with the second pipe section 12, a sealing cavity 13 is enclosed by the seal 111 on the inner wall of the first pipe section 11 and their connection part, providing an operating space for the pressure test, so that the test process can simulate the actual working condition of the pipe section seal under internal and external pressures. Then, a sealing clamp 2 is clamped on the outer periphery of the connection part to further strengthen the sealing structure, ensuring the stability of the seal during the test and avoiding the leakage of the test liquid from the outer periphery of the connection part of the first pipe section 11 and the second pipe section 12, which may affect the test results. An opening connection through - hole 20 on the sealing clamp 2 realizes the communication between the sealing cavity 13 and the outside, facilitating the subsequent injection of the test liquid and the application of pressure. After that, the sealing cavity 13 is filled with test liquid and continuously pressurized, simulating the scenario of the single - channel sealed pipe section bearing pressure in actual application. By measuring the test pressure value in the sealing cavity 13 in real time, the pressure data borne by the pipe system 1 to be tested can be accurately obtained. Finally, the pressure condition of the pipe system 1 to be tested is obtained based on the leakage situation of the test liquid and the test pressure value. This test method can effectively conduct a pressure test on single - channel sealed pipe sections without damaging the body of the pipe system 1 to be tested, with low cost and high measurement efficiency.

[0047] The following elaborates on the specific steps of the pressure test method for single - channel sealed pipe sections.

[0048] S1. Coaxially dock the first pipe section 11 with the second pipe section 12, and a sealing cavity 13 is jointly enclosed by the connection part of the first pipe section 11 and the second pipe section 12 and the seal 111;

[0049] Specifically, first, the socket end of the second pipe section 12 is accurately aligned with the spigot end of the first pipe section 11 along the axial direction. Through the pushing device, the first pipe section 11 and the second pipe section 12 are gradually brought closer until the socket is completely inserted into the spigot. At this time, the spigot end face of the first pipe section 11, the socket end face of the second pipe section 12, and the compressed seal 111 jointly enclose an annular sealed cavity, that is, the seal cavity 13. The axial length of the seal cavity 13 is determined by the installation position of the seal 111, and the radial width is determined by the distance between the end faces of the first pipe section 11 and the second pipe section 12.

[0050] S2. A sealing clamp 2 is clamped on the outer or inner periphery of the connection between the first pipe section 11 and the second pipe section 12. Here, the case where the sealing clamp 2 is clamped on the outer periphery of the connection between the first pipe section 11 and the second pipe section 12 is taken as an example.

[0051] Specifically, in S2, the sealing clamp 2 includes two semi-circular clamp sections 21. The inner peripheral surface of each clamp section 21 is processed into an arc structure consistent with the outer wall curvature of the pipe system 1 to be measured, ensuring that the clamp section 21 forms a full circumferential fit with the outer surface of the pipe system 1 to be measured. During installation, the two clamp sections 21 are symmetrically wrapped from both sides of the outer periphery of the connection between the first pipe section 11 and the second pipe section 12. The axial length of the clamp section 21 needs to completely cover the docking area between the first pipe section 11 and the second pipe section 12. After the clamp sections 21 are docked, the two clamp sections 21 can be buckled with each other and locked by the locking bolts 22, so as to be clamped on the outer periphery of the connection between the first pipe section 11 and the second pipe section 12.

[0052] Furthermore, an annular groove is preset on the inner side of each clamp section 21, and a highly elastic rubber sealing strip is embedded in the annular groove. When the clamp section 21 is locked, the rubber sealing strip is radially compressed and deformed, tightly filling the assembly gap between the inner wall of the sealing clamp 2 and the outer surface of the pipe system 1 to be measured, forming a first sealing barrier.

[0053] Preferably, the end of the clamp section 21 is designed with a radial flange structure, and the radial flange structure matches the outer contour of the connection between the first pipe section 11 and the second pipe section 12, further restricting the risk of axial displacement of the sealing clamp 2.

[0054] S3. A connection through hole 20 is opened on the sealing clamp 2 for communicating the seal cavity 13 with the outside;

[0055] Specifically, two opening points are selected circumferentially at the top of the sealing clamp 2. Based on the structural strength distribution of the clamp section 21 and the fluid dynamic characteristics of the sealing cavity 13, the axis of the connecting through-hole 20 is set perpendicular to the outer surface of the sealing clamp 2. Before opening the hole, a positioning tooling is used to fix the clamp section 21 to ensure that the geometric and positional accuracy of the sealing clamp 2 is not affected during the drilling process. First, a small-diameter drill bit is used to drill a guide hole along a preset angle, and then it is replaced with a standard-diameter drill bit of the appropriate size to complete the final forming of the connecting through-hole 20. The inner wall of the connecting through-hole 20 needs to be chamfered to remove burrs to avoid damage to the sealing surface during subsequent pipeline connection.

[0056] More specifically, there are two connecting through-holes 20. One connecting through-hole 20 is used to inject the test liquid, and the other connecting through-hole 20 is used to discharge the air in the sealing cavity 13. By setting two independent connecting through-holes 20 to respectively undertake the functions of liquid injection and air exhaust, the synchronous injection of the test liquid and the discharge of the air in the sealing cavity 13 can be realized during the liquid injection stage. When the test liquid enters the sealing cavity 13 through the connecting through-hole 20 for liquid injection, the original air in the sealing cavity 13 is naturally discharged along the connecting through-hole 20 for air exhaust under the displacement action of the test liquid, completely eliminating the problem of bubble retention caused by the coexistence of gas and liquid phases in the sealing cavity 13, preventing the resulting pressure fluctuations or incomplete air exhaust phenomena, ensuring the integrity and uniformity of the test liquid filling in the sealing cavity 13, and improving the test accuracy.

[0057] In this embodiment, the test liquid is preferably water, which has the characteristics of low cost, easy availability, environmental friendliness and stable physical properties, and can meet the core requirements of conventional pressure tests for the incompressibility of the medium and the pressure transmission efficiency. In other alternative embodiments, the type of the test liquid can be adaptively adjusted according to specific test scenarios or special working conditions requirements. Such as using liquids such as glycerol and hydraulic oil, which are not limited here.

[0058] Preferably, in the radial cross-section of the pipeline system 1 to be tested, the two connecting through-holes 20 are symmetrically arranged with respect to the vertical center line of the pipeline system 1 to be tested, and an angle of 15° is formed between the axis of each connecting through-hole 20 and the vertical center line of the pipeline system 1 to be tested. On the one hand, the design of the 15° angle not only makes the inclination angle of the connecting through-hole 20 for liquid injection beneficial to the tangential flow state of the test liquid injected into the sealing cavity 13, utilizes the centrifugal effect to promote the spiral flow of the test liquid along the inner wall of the sealing cavity 13, accelerates the filling process and reduces the attachment of bubbles; but also facilitates the residual air in the sealing cavity 13 to converge to the highest point along the shortest path and be discharged from the connecting through-hole 20 under the displacement of the test liquid. On the other hand, the space complementary relationship formed by the symmetrical arrangement and inclination of the two connecting through-holes 20 enables the installation position of subsequent external equipment to avoid the central line area at the top of the pipeline system 1 to be tested, avoiding interference between the external equipment and the connecting through-holes 20.

[0059] In other embodiments, the setting parameters of the connecting through-hole 20 can be adaptively adjusted according to actual test requirements or the structural characteristics of the pipeline system 1 to be tested. For example, the number of the connecting through-holes 20 can be extended to multiple ones to match the liquid injection efficiency of different sealing cavities 13 and the design requirements of the exhaust path; the included angle between the connecting through-holes 20 can also be reset based on the dynamic characteristics of the test fluid or spatial layout limitations. In addition, the specific setting position of the connecting through-holes 20 in the circumferential direction of the sealing clamp 2 can be flexibly adjusted according to conditions such as the construction environment. The adjustment of the above parameters all follows the core principle of realizing the connection between the sealing cavity 13 and the outside through the connecting through-hole 20 in the present invention, which belongs to the equivalent deformation or extended application of the technical solution of this patent. Therefore, the specific numerical values and positional relationships thereof should not be construed as a limitation to the present invention.

[0060] S4. Fill the sealing cavity 13 with test liquid through the connecting through-hole 20;

[0061] Specifically, referring to Figure 6 , in S4, after the opening of the connecting through-hole 20 is completed, flow guide pipes 3 are welded to the two connecting through-holes 20 respectively. The inner diameter of the flow guide pipe 3 is equal to the aperture of the connecting through-hole 20 to ensure a smooth transition of the inner walls of the two after welding. Each flow guide pipe 3 is equipped with a control valve 4, and the control valve 4 is used to control the connection or disconnection of the flow guide pipe 3.

[0062] In the liquid injection stage, the control valve 4 corresponding to the connecting through-hole 20 for liquid injection remains fully open, while the control valve 4 of the connecting through-hole 20 for exhaust adjusts the opening degree in stages according to the liquid injection progress: at the initial stage of liquid injection, the exhaust valve of the connecting through-hole 20 for exhaust is fully open, and the air in the sealing cavity 13 is driven to rise along the flow guide pipe 3 and discharged by the gravity difference; when it is observed that the liquid continuously flows out of the connecting through-hole 20 for exhaust, the corresponding control valve 4 is gradually closed to establish a backpressure environment in the sealing cavity 13, forcing the subsequent injected test liquid to uniformly fill the gap of the sealing cavity 13, so that the sealing cavity 13 is filled with test liquid.

[0063] S5. Continuously pressurize the sealing cavity 13 through the connecting through-hole 20 and measure the test pressure value in the sealing cavity 13 in real time;

[0064] Specifically, referring to Figure 7 , in S5, a pressure pump 5 is arranged on one of the flow guide pipes 3, and the pressure pump 5 is used to continuously pressurize the sealing cavity 13; a pressure gauge 6 is arranged on the other flow guide pipe 3, and the pressure gauge 6 is used to measure the test pressure value in the sealing cavity 13.

[0065] When starting to pressurize, start the pressure pump 5 installed on the diversion pipe 3. The operation of the pressure pump 5 causes the working components inside the pump to displace, changing the volume of the pump chamber. With the regular change of the pump chamber volume, the test liquid is continuously sucked into the pump chamber, and when the pump chamber volume shrinks, under the action of pressure, it is injected into the sealing chamber 13 along the diversion pipe 3. During the injection process, due to the continuous operation of the pump, the injected test liquid accumulates continuously, causing the pressure in the sealing chamber 13 to rise continuously. During the test, the operator observes the numerical change of the pressure gauge 6 installed on another diversion pipe 3 at all times. The reading of the pressure gauge 6 is the test pressure value, so as to evaluate the pressure condition of the pipe joint 1 to be tested.

[0066] In this embodiment, the pressure pump 5 is a plunger pump. After the pressure pump 5 is started, the motor drives the piston of the pump body to move reciprocally. When the piston moves outwards, the volume of the pump chamber increases and the pressure decreases, and the test liquid is sucked into the pump chamber under the action of atmospheric pressure; when the piston moves inwards, the volume of the pump chamber decreases and the pressure increases, and the test liquid is pressed into the diversion pipe 3 and then enters the sealing chamber 13, realizing continuous pressurization of the sealing chamber 13.

[0067] In other embodiments, the pressure pump 5 can also be a diaphragm pump, etc.; in addition, the pressure gauge 6 can be an existing spring pressure gauge or digital pressure gauge, etc., which is not limited here.

[0068] Preferably, a check valve structure is built in the output end of the pressure pump 5 to prevent the test liquid from flowing back.

[0069] S6. Obtain the pressure condition of the pipe system 1 to be tested based on the leakage condition of the test liquid and the test pressure value.

[0070] Among them, there are two methods for evaluating the external pressure condition.

[0071] The first is the external pressure limit evaluation method based on the detection of the leakage critical point of the pipe system 1 to be tested. Its core lies in continuously pressurizing to the seal failure state and inversely deducing the actual external pressure bearing capacity of the pipe system 1 to be tested.

[0072] Specifically, when the sealing clamp 2 is clamped on the outer periphery of the connection between the first pipe joint 11 and the second pipe joint 12, in S6, when the test liquid leaks from the inside of the pipe system 1 to be tested, the pressure applied to the outside of the surface of the pipe system 1 to be tested (simulated by pressurizing by injecting the test liquid into the sealing chamber 13) causes the seal of the pipe system 1 to be tested to fail, and the test liquid leaks into the inside of the pipe system 1 to be tested, indicating that the external pressure acts on the seal of the pipe system 1 to be tested and breaks through the seal. Therefore, the pressure measured at this time reflects the external pressure condition of the pipe system 1 to be tested. Therefore, when the test liquid leaks from the inside of the pipe system 1 to be tested, record the test pressure value at this moment, and substitute the test pressure value into the preset calculation formula to obtain the external pressure value of the pipe system 1 to be tested.

[0073] Since the pressure borne by the inner wall of the sealing chamber 13 comes not only from the pressure brought by the pressurizing pump 5 to pressurize the test liquid (i.e., the reading of the pressure gauge 6), but also includes the pressure generated by the gravity of the test liquid in the sealing chamber 13. And since the pressure generated by the gravity of the test liquid received by the sealing chamber 13 at different positions of the pipe system 1 to be tested is different, when the leakage position is at different positions of the pipe system 1 to be tested, the preset formula for calculating the external pressure value of the pipe system 1 to be tested is also different.

[0074] Specifically, when the leakage position is at the bottom of the pipe system 1 to be tested, the preset formula is:

[0075]

[0076] When the leakage point is at the bottom of the pipe system 1 to be tested, the hydrostatic pressure of the test liquid here reaches the peak value (the liquid column height The static pressure increment ΔP = ρgH, where ρ is the liquid density and g is the acceleration due to gravity). Since in actual engineering, the larger the outer diameter D1 of the pipe system 1 to be tested, the higher the liquid column height H, and the static pressure increment is positively correlated with D1. Therefore, the preset formula introduces The empirical coefficient to equivalently represent the additional pressure generated by the liquid column gravity of the test liquid at this position.

[0077] When the leakage position is in the middle of the pipe system 1 to be tested, the preset formula is:

[0078]

[0079] When the leakage position is in the middle of the pipe system 1 to be tested, at this time the liquid column height The static pressure increment is about half of that when the leakage position is at the bottom of the pipe system 1 to be tested, so the correction coefficient is adjusted to To match the static pressure contribution at this position.

[0080] When the leakage position is at the top of the pipe system 1 to be tested, the preset formula is:

[0081] p1 = P2

[0082] When the leakage position is at the top of the pipe system 1 to be tested, the hydrostatic pressure approaches zero, and the test pressure value P2 can be equal to the external pressure value P1 without correction.

[0083] Where, P1 is the external pressure value, P2 is the test pressure value, and D1 is the outer diameter of the pipe system 1 to be tested.

[0084] When the test liquid leaks from the outside of the pipe system 1 to be tested, it means that the pressure in the sealing cavity 13 cannot be effectively transmitted to the seal 111 due to the sealing failure between the sealing clamp 2 and the outer wall of the pipe system 1 to be tested, resulting in the test data being unable to truly reflect the external pressure resistance of the sealing structure of the pipe system 1 to be tested. Thus, it indicates that the sealing of the sealing clamp 2 is unqualified, and the sealing clamp 2 needs to be reinforced until the test liquid does not leak from the inside of the pipe system 1 to be tested.

[0085] Specifically, first check the fastening status of each connection part of the sealing clamp 2, and eliminate local gaps by uniformly increasing the bolt pre-tightening force; if the leakage still exists, further check the compression amount and surface fitting degree of the sealing strip embedded in the sealing clamp 2, and replace the sealing strip or repair local defects on the outer wall of the pipe system 1 to be tested if necessary to restore the continuity of the contact surface. After the reinforcement is completed, re-execute the test process until the test liquid does not leak from the inside of the pipe system 1 to be tested.

[0086] The second one is a rapid acceptance test method based on a preset critical value, which is applicable to the engineering acceptance scenario with a known design pressure threshold.

[0087] In S6, when the test pressure value is greater than or equal to the critical pressure value, judge whether the test liquid in the sealing cavity 13 leaks. If the test liquid leaks, it indicates that the external pressure condition is unqualified; otherwise, it indicates that the external pressure condition is qualified. This method avoids the resource waste of having to pressurize to the leakage point in the first test, which may cause damage to the pipe system 1 to be tested, through a target-oriented pressure loading method, and is applicable to the quality sampling inspection of batch pipe joints.

[0088] For example, the set critical pressure value is 5 MPa. Slowly and evenly apply pressure to the sealing cavity 13 through the pressure pump 5. During the pressure application process, always pay attention to the numerical change of the pressure gauge 6. When the test pressure value shown on the pressure gauge 6 reaches 5 MPa, stop further pressurizing. At this time, carefully observe whether there is any sign of leakage of the test liquid in the sealing cavity 13, and comprehensively check all parts of the pipe system 1 to be tested, including the sealing interface, pipe wall, etc. If it is found that the test liquid seeps out from any part of the sealing cavity 13, such as water droplets dripping at the sealing interface or wet marks on the pipe wall, it indicates that under the action of an external pressure of 5 MPa, the sealing performance of the sealed pipe joint cannot meet the requirements and the test liquid leaks. Then, the external pressure condition of the pipe system 1 to be tested is determined to be unqualified; if after inspection, no leakage of the test liquid is found, all parts of the tested pipe joint remain dry and there is no trace of the test liquid seeping out, which means that under an external pressure of 5 MPa, the pipe system 1 to be tested can effectively prevent the test liquid from leaking and has good sealing performance. The external pressure condition of the pipe system 1 to be tested is determined to be qualified.

[0089] The above pressure test method for single - channel sealed pipe joints further includes S7. After the test is completed, use a grinding wheel to cut off the welded diversion pipe 3, and use a welding machine to fill and seal the connection through - hole 20. After grinding the repaired hole flat, perform internal and external anti - corrosion operations to meet the quality requirements of the original pipe system 1 to be tested.

[0090] Specifically, first use a grinding wheel to precisely cut along the welding interface between the diversion pipe 3 and the sealing clamp 2, stripping the main structure of the diversion pipe 3 while avoiding mechanical damage outside the heat - affected zone to the outer wall of the sealing clamp 2 and the pipe system 1 to be tested. After cutting, use the arc - welding process to perform layered surfacing filling on the connection through - hole 20. During the welding process, strictly control the inter - layer temperature and the bead formation to ensure that the metallographic structure of the sealed area is consistent with that of the base metal and eliminate the risk of stress concentration caused by welding defects. The welded scar after filling is processed by a angle grinder through multi - level grinding, successively using rough grinding, fine grinding, and polishing processes to make the repaired surface smoothly transition to the original contour of the pipe system 1 to be tested, and the roughness reaches the outer - wall standard of the original pipe system 1 to be tested. Finally, perform internal and external synchronous anti - corrosion treatment on the repaired area. The outer wall of the pipe system 1 to be tested is coated with anti - corrosion paint in layers that matches the original coating system of the pipe system 1 to be tested, and the inner wall of the pipe system 1 to be tested is coated with pressure - resistant anti - corrosion material by spraying or brushing to ensure that the corrosion resistance and mechanical strength of the repaired part are fully restored to the initial state of the pipe system 1 to be tested.

[0091] Embodiment 2

[0092] For simplicity, the same or corresponding components as in Embodiment 1 are denoted by the corresponding reference numerals in Embodiment 1, and only the differences between Embodiment 2 and Embodiment 1 are described. The differences are as follows:

[0093] Regarding the evaluation process of the internal - pressure situation, according to the technical solution of the present invention, when the sealing clamp 2 is installed on the inner circumference of the connection between the first pipe joint 11 and the second pipe joint 12, the leakage path of the test liquid and the pressure - transmission direction change accordingly.

[0094] In S6, if the test liquid leaks from the outside of the pipe system 1 to be tested, it indicates that the restraint effect of the sealing clamp 2 on the inner wall of the pipe joint does not reach the expected sealing effect. At this time, the recorded test - pressure value needs to be converted into an equivalent internal - pressure value through a preset calculation formula. The calculation logic of this internal - pressure value forms a mirror image relationship with the calculation process in the external - pressure - value test.

[0095] Since the sealing cavity 13 is located inside the pipeline system 1 to be tested at this time, the pressure exerted by the test liquid is transmitted to the inner wall of the pipe joint through the sealing clamp 2, simulating the forward extrusion effect of the internal fluid on the sealing structure in the actual working condition. When external leakage occurs in the pipeline system 1 to be tested, the test pressure value needs to compensate for the pressure distribution offset caused by the geometric shape difference of the sealing cavity 13 in combination with the spatial position of the leakage point (such as the axial or circumferential distribution of the pipe joint) and the pipe diameter parameter, and finally obtain the critical bearing capacity of the sealing structure under the internal pressure action.

[0096] It can be understood that the test method of the internal pressure value and the installation process of the device are exactly the same as the external pressure value test scheme. Only the installation position of the sealing clamp 2 needs to be adjusted from the outer circumference of the pipe joint to the inner circumference. The remaining steps, including the construction of the sealing cavity 13, the opening of the connecting through hole 20, the pressure control and the leakage observation, all follow the same operation specifications. The specific implementation details can refer to Embodiment 1 of the external pressure test, so they will not be repeated here.

[0097] This design realizes a comprehensive evaluation of the internal and external bidirectional sealing performance of the pipeline system 1 to be tested by the same test device through the flexible switching of the installation direction of the sealing clamp 2, expanding the engineering applicability and economy of the test method.

[0098] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A pressure testing method for a single-channel sealed pipe joint, applied to a pipe system to be tested (1), the pipe system to be tested (1) includes a first pipe joint (11) and a second pipe joint (12), and a seal (111) is provided on the inner wall of the first pipe joint (11), characterized in that, The pressure test method for a single - channel sealed pipe joint includes: S1. Coaxially butt - joint the first pipe joint (11) and the second pipe joint (12), and a sealing cavity (13) is jointly formed by enclosing the connection part of the first pipe joint (11) and the second pipe joint (12) together with the seal (111); S2. Snap - fit a sealing clamp (2) on the outer circumference or inner circumference of the connection part of the first pipe joint (11) and the second pipe joint (12); S3. Open a connection through - hole (20) at the top of the sealing clamp (2) for connecting the sealing cavity (13) with the outside; S4. Fill the sealing cavity (13) with test liquid through the connection through - hole (20); S5. Continuously pressurize the sealing cavity (13) through the connection through - hole (20), and measure the test pressure value in the sealing cavity (13) in real - time; S6. Obtain the pressure condition of the pipe system to be tested (1) based on the leakage situation of the test liquid and the test pressure value.

2. The pressure test method for a single-channel sealed pipe joint according to claim 1, characterized in that, When the sealing clamp (2) is snap - fitted on the outer circumference of the connection part of the first pipe joint (11) and the second pipe joint (12), in S6, when the test liquid leaks from the inside of the pipe system to be tested (1), record the test pressure value at this moment, and substitute the test pressure value into a preset formula to obtain the external pressure value of the pipe system to be tested (1).

3. The pressure testing method for single-channel sealed pipe joints according to claim 2, characterized in that, When the leakage position is at the bottom of the pipe system to be tested (1), the preset formula is: When the leakage position is in the middle of the pipe system to be tested (1), the preset formula is: When the leakage position is at the top of the pipe system to be tested (1), the preset formula is: P1 = P2 Wherein, P1 is the external pressure value, P2 is the test pressure value, and D1 is the outer diameter of the pipe system to be tested (1).

4. The pressure testing method for single-channel sealed pipe joints according to claim 2, characterized in that In S6, When the test liquid leaks from the outside of the pipe system to be tested (1), it indicates that the sealing of the sealing clamp (2) is unqualified, and the sealing clamp (2) is reinforced until the test liquid does not leak from the inside of the pipe system to be tested (1).

5. The pressure testing method for single-channel sealed pipe joints according to claim 2, characterized in that In S6, when the test pressure value is greater than or equal to the critical pressure value, determine whether the test liquid in the sealing cavity (13) leaks. If the test liquid leaks, it indicates that the external pressure condition is unqualified; otherwise, it indicates that the external pressure condition is qualified.

6. The pressure test method for single - channel sealed pipe joints according to claim 1, wherein, Two connection through - holes (20) are opened, one of the connection through - holes (20) is used for injecting the test liquid, and the other connection through - hole (20) is used for discharging the air in the sealing cavity (13).

7. The pressure testing method for single - channel sealed pipe sections according to claim 6, wherein In the radial cross - section of the pipe system to be tested (1), the two connection through - holes (20) are symmetrically arranged about the vertical center line of the pipe system to be tested (1), and an included angle of 15° is formed between the axis of each connection through - hole (20) and the vertical center line of the pipe system to be tested (1).

8. The pressure testing method for single-channel sealed pipe joints according to claim 6, characterized in that In S4, Weld diversion pipes (3) on the two connection through - holes (20) respectively, and each diversion pipe (3) is equipped with a control valve (4), and the control valve (4) is used to control the connection or disconnection of the diversion pipe (3).

9. The pressure testing method for single-channel sealed pipe sections according to claim 8, characterized in that, In S5, A pressure pump (5) is provided on one of the flow guide pipes (3), and the pressure pump (5) is used to continuously pressurize the sealing cavity (13); A pressure gauge (6) is provided on the other flow guide pipe (3), and the pressure gauge (6) is used to measure the test pressure value in the sealing cavity (13).

10. The pressure testing method for single - channel sealed pipe sections according to claim 1, characterized in that, In the step S2, The sealing clamp (2) includes two semi-circular clamp segments (21), and the two clamp segments (21) can be buckled with each other and locked by a locking bolt (22), so as to be clamped on the outer periphery of the joint of the first pipe section (11) and the second pipe section (12).

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