A test device for simulating ion erosion of PCCP protective layer

Abstract

The present disclosure provides a test device for simulating ion corrosion of a PCCP protective layer, which includes a solution corrosion container, the solution corrosion container is provided with a container inner cavity, and the solution corrosion container is arranged on the circumferential surface of the PCCP tube body; the rear side of the solution corrosion container is in close contact with the circumferential surface of the PCCP tube body, and the front side of the solution corrosion container is provided with a plurality of transparent windows; the inner cavity of the container is connected downwardly with a solution placement barrel and upwardly with a liquid level display barrel, and a liquid extraction hose is connected between the inside of the liquid level display barrel and the inside of the solution placement barrel; three transparent windows are provided on the front side of the solution corrosion container, and vertical sealing strips are provided on the left and right sides of the transparent windows; the lower end of the liquid extraction hose located inside the solution placement barrel is connected to a water pump, and the inner cavity of the container is further connected to a blower. The present disclosure can consider load, single chloride / sulfate ion corrosion, coupled ion corrosion, ion concentration, dry-wet cycle and surface protection measures, and carry out prototype test research on ion corrosion under long-term high internal pressure.

Description

Technical Field

[0001] The present invention relates to the field of ion corrosion experiments in construction engineering, and in particular to a testing device for simulating ion corrosion of a PCCP protective layer under the influence of multiple factors under load. Background Art

[0002] my country's Northwest region is rich in large areas of saline soil. Structural cracking, powdering, steel corrosion and local erosion caused by corrosive salt erosion such as sulfates and chlorides cause safety hazards to a large number of engineering buildings every year. Prestressed Concrete Cylinder Pipe (PCCP) refers to a water pipe made by winding annular prestressed steel wire on a high-strength concrete pipe core with a steel cylinder, and then spraying a dense cement mortar protective layer on it. There is an unbalanced distribution of water resources in the Northwest region, and natural water resources in some areas are difficult to meet the demand for industrial water. A large number of long-distance water pipeline projects are needed to allocate water resources. Along with the erosion of saline soil, groundwater accumulation, and developed irrigation agriculture, the salinity of the soil in the stratum where the buried pipelines are located is complex and changeable, such as PH, Cl - and SO 4 2- The difference may cause corrosion or even bursting of PCCP.

[0003] At present, the research on ion corrosion of PCCP mainly adopts a simplified method, that is, ordinary immersion test without load, and the influence of load has not been considered. Ion corrosion of PCCP protective layer is the result of the combined effect of materials, load and environment. The roller spraying process of PCCP mortar protective layer during pipe making, wire relaxation during curing, creep and shrinkage of concrete, and load borne by the pipe body during operation will cause the physical and load state of the mortar protective layer to change, affecting the ion corrosion process.

[0004] In order to meet engineering needs, improving the PCCP durability test method is one of the inevitable processes to solve the durability problem. It is particularly urgent to design a test device that simulates ion corrosion of the PCCP protective layer under equivalent internal pressure, which can adapt to various testing needs and solve the problem of insufficient simulation of actual ion corrosion. Summary of the invention

[0005] In response to the above technical problems in the related art, the present disclosure proposes a testing device for simulating ion corrosion of a PCCP protective layer, which can overcome the above deficiencies in the prior art.

[0006] To achieve the above technical objectives, the technical solution of the present disclosure is implemented as follows:

[0007] A test device for simulating ion erosion of a PCCP protective layer comprises a solution erosion container, wherein the solution erosion container is provided with a container inner cavity and is arranged on the circumferential surface of a PCCP tube body; the rear side surface of the solution erosion container is in close contact with the circumferential surface of the PCCP tube body, and a plurality of transparent windows are arranged on the front side surface of the solution erosion container; the container inner cavity is downwardly connected to a solution placement barrel and upwardly connected to a liquid level display barrel, and a liquid extraction hose is connected between the inside of the liquid level display barrel and the inside of the solution placement barrel.

[0008] Preferably, the number of transparent windows provided on the front side of the solution etching container depends on actual needs, and preferably three transparent windows are provided.

[0009] Preferably, vertical sealing strips are provided on the left and right sides of the transparent window.

[0010] Preferably, the lower end of the liquid extraction hose located inside the solution placement barrel is connected to a water pump, and the inner cavity of the container is further connected to a blower.

[0011] Preferably, the transparent window is made of a transparent PC board.

[0012] Preferably, the solution corrosion container adopts a rust-proof shell.

[0013] Preferably, the upper and lower sides of the solution erosion container are respectively provided with clamps for fixing it to the circumferential surface of the PCCP pipe body.

[0014] Preferably, a rainproof pressure plate is provided on the top of the liquid level display barrel, and an exhaust port is provided on the rainproof pressure plate, and the exhaust port is connected to the inside of the liquid level display barrel.

[0015] Preferably, at least one blast port is provided at the top of the inner cavity of the container, and the blower can be connected to the inner cavity of the container via a three-way connecting pipe or at least one conduit through the corresponding blast port.

[0016] Preferably, a liquid discharge port is provided at the bottom of the inner cavity of the container, and the liquid discharge port is connected to the solution placement barrel; a liquid inlet is provided at the top of the inner cavity of the container, and the liquid inlet is connected to the liquid level display barrel.

[0017] Preferably, the PCCP tube body is sleeved on the outside of the steel inner liner, a base 2001 is provided at the bottom of the steel inner liner, the bottom of the PCCP tube body is close to the top of the base 2001, and the space enclosed between the inner wall of the PCCP tube body and the outer wall of the steel inner liner forms a tube body cavity.

[0018] Preferably, a layered scaffold is set up around the PCCP pipe body, and the PCCP pipe body is subdivided into a plurality of partitions by the scaffold, and a plurality of solution erosion containers are arranged on the circumferential surface of each partition.

[0019] Preferably, the top of the PCCP pipe body is connected to a PCCP pipe exhaust port, the bottom of the PCCP pipe body is connected to an internal pressure loading machine via a water pipe, and the water pipe is provided with an internal water pressure gauge.

[0020] Preferably, the PCCP pipe body is preferably subdivided into 4 partitions, which can be partition I, partition II, partition III, and partition IV respectively; each partition of the PCCP pipe body is preferably provided with 3 solution erosion containers. Therefore, each partition is divided into three test areas (A, B, C) by the 3 solution erosion containers provided therein, and each test area corresponds to a test device.

[0021] Preferably, the PCCP pipe body can be connected to the outside through a connecting flange, and the specific method can be: a connecting flange can be provided at the top and bottom of the PCCP pipe body, respectively, and a flange water injection port and a flange exhaust port can be provided on the connecting flange. The flange water injection port and the flange exhaust port can be connected to the inner cavity of the pipe body respectively, and the flange exhaust port at the top can be connected to the PCCP pipe exhaust port, and the flange water injection port at the bottom is connected to the water pipe, so as to realize water injection or exhaust of air into the inner cavity of the pipe body through the connecting flange. During implementation, the internal pressure loading machine drives the water body to flow through the water pipe, and then injects water into the inner cavity of the pipe body through the flange water injection port, and exhausts the air in the inner cavity of the pipe body through the flange exhaust port.

[0022] Beneficial effects of the present disclosure: Compared with the prior art, the present disclosure solves the process simulation of ion corrosion of the PCCP protective layer under real load conditions and explores the key factors affecting the corrosion effect.

[0023] As the diversion and drainage project goes deeper into the complex environment of high salinity in the northwest, this paper faces the need for the construction of modern high-quality water conservancy infrastructure. The study of ion corrosion laws under real load levels can provide guarantees for the safe operation of long-distance water pipelines and provide strong support for the construction of the national water network. The device-level supporting test has great theoretical and practical significance for the durability design and evaluation of PCCP in high-salinity areas, which can promote the improvement of PCCP industry technology and help its promotion in complex erosion environments.

[0024] The present disclosure avoids the problem of low load level caused by the brittleness and discreteness of concrete in ion corrosion tests under general loads, reflects the high tensile strain characteristics of the PCCP protective layer, realizes the study of ion corrosion characteristics under long-term real loads and multiple factors, and more accurately reveals the time-varying law of ion corrosion PCCP protection. The present disclosure uses a no-load immersion test as a control group, and with the help of PCCP internal pressure loading equipment, designs a multi-partitioned independent ion corrosion device on the surface of the protective layer, and can consider load, single chloride / sulfate ion corrosion, coupled ion corrosion, ion concentration, dry-wet cycle and surface protection measures to carry out prototype test research on ion corrosion under long-term high internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the testing device for simulating ion corrosion of the PCCP protective layer described in the present invention.

[0027] Figure 2 is a front view of the solution etching container described in the present disclosure.

[0028] Figure 3 is a perspective view of a solution etching container according to the present disclosure.

[0029] Figure 4 It is a top-down sectional view of the cooperation between the testing device and the PCCP pipe body.

[0030] Figure 5 It is a cross-sectional view from the main perspective of the cooperation between the testing device and the PCCP pipe body.

[0031] Figure 6 It is a three-dimensional structural schematic diagram of the PCCP pipe body, internal pressure loading machine, water pipe, internal pressure loading machine, and connecting flange (test equipment, scaffolding, etc. are removed).

[0032] In the figure: 1. solution placement barrel; 2. clamp; 3. liquid outlet; 4. vertical sealing strip; 5. solution erosion container; 501. transparent window; 6. three-way connecting pipe; 7. blower; 8. exhaust port; 9. rainproof pressure plate; 10. liquid level display barrel; 11. liquid extraction hose; 12. water pump; 13. PCCP pipe body; 14. PCCP pipe exhaust port; 15. scaffolding; 16. internal pressure loader; 1601. top opening of internal pressure loader; 17. water pressure gauge; 18. water guide pipe; 19. connecting flange; 1901. flange water inlet; 1902. flange exhaust port; 20. steel liner; 2001. base. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0034] like Figure 1-6As shown, in order to facilitate the understanding of the above technical solutions of the present disclosure, the above technical solutions of the present disclosure are described in detail below through specific usage methods.

[0035] The test device for simulating ion corrosion of the PCCP protective layer includes a solution corrosion container 5, which is provided with a container inner cavity and is arranged on the circumferential surface of the PCCP tube body 13; the rear side of the solution corrosion container 5 is in close contact with the circumferential surface of the PCCP tube body 13, and the front side of the solution corrosion container 5 is provided with a plurality of transparent windows 501; the container inner cavity is connected downwardly to a solution placement barrel 1 and upwardly to a liquid level display barrel 10, and a liquid extraction hose 11 is connected between the inside of the liquid level display barrel 10 and the inside of the solution placement barrel 1.

[0036] In one embodiment, the number of transparent windows 501 provided on the front side of the solution etching container 5 depends on actual needs, and preferably, three transparent windows 501 are provided.

[0037] In one embodiment, vertical sealing strips 4 are provided on the left and right sides of the transparent window 501 .

[0038] In one embodiment, the lower end of the liquid extraction hose 11 located inside the solution placement barrel 1 is connected to a water extraction pump 12, and the inner cavity of the container is further connected to a blower 7.

[0039] In one embodiment, the transparent window 501 is made of a transparent PC board.

[0040] In one embodiment, the solution corrosion container 5 adopts a rust-proof shell.

[0041] In one embodiment, the upper and lower sides of the solution erosion container 5 are respectively provided with clamps 2 for fixing it to the circumferential surface of the PCCP pipe body 13.

[0042] In one embodiment, a rainproof pressure plate 9 is provided on the top of the liquid level display barrel 10 , and an exhaust port 8 is provided on the rainproof pressure plate 9 , and the exhaust port 8 is connected to the inside of the liquid level display barrel 10 .

[0043] In one embodiment, at least one blast port is provided at the top of the inner cavity of the container, and the blower 7 can be connected to the inner cavity of the container via a three-way connecting pipe 6 or at least one conduit through the corresponding blast port.

[0044] In one embodiment, a liquid discharge port 3 is provided at the bottom of the inner cavity of the container, and the liquid discharge port 3 is connected to the solution placement barrel 1 ; a liquid inlet is provided at the top of the inner cavity of the container, and the liquid inlet is connected to the liquid level display barrel 10 .

[0045] In a certain embodiment, the PCCP tube body 13 is sleeved on the outside of the steel inner liner 20, a base 2001 is provided at the bottom of the steel inner liner 20, the bottom of the PCCP tube body 13 is close to the top of the base 2001, and the space enclosed between the inner wall of the PCCP tube body 13 and the outer wall of the steel inner liner 20 forms an inner cavity of the tube body.

[0046] In one embodiment, a layered scaffold 15 is set up around the PCCP pipe body 13, and the PCCP pipe body 13 is subdivided into a plurality of partitions by the scaffold 15, and a plurality of solution erosion containers 5 are arranged on the circumferential surface of each partition.

[0047] In one embodiment, the top of the PCCP pipe body 13 is connected to a PCCP pipe exhaust port 14 , and the bottom of the PCCP pipe body 13 is connected to an internal pressure loading machine 16 via a water pipe 18 , and the water pipe 18 is provided with an internal water pressure gauge 17 .

[0048] In one embodiment, the PCCP pipe body 13 is subdivided into four partitions, namely, partition I, partition II, partition III, and partition IV; each partition of the PCCP pipe body 13 is provided with three solution erosion containers 5; therefore, each partition is divided into three test areas (A, B, and C) by the three solution erosion containers 5 provided therein, and each test area corresponds to a test device. Different test devices do not affect each other, and preferably do not share their own structures.

[0049] In a certain embodiment, the PCCP pipe body 13 can be connected to the outside through a connecting flange 19. The specific method can be: a connecting flange 19 is provided at the top and bottom of the PCCP pipe body 13, respectively. A flange water injection port 1901 and a flange exhaust port 1902 are provided on the connecting flange 19. The flange water injection port 1901 and the flange exhaust port 1902 are respectively connected to the inner cavity of the pipe body. The flange exhaust port 1902 at the top can be connected to the PCCP pipe exhaust port 14, and the flange water injection port 1901 at the bottom is connected to the water guide pipe 18, so as to realize water injection or exhaust of air into the inner cavity of the pipe body through the connecting flange 19. The connecting flange 19 belongs to the prior art. When implemented, the internal pressure loading machine 16 drives the water body to flow through the water guide pipe 18, and then injects water into the inner cavity of the pipe body through the flange water injection port 1901, and exhausts the air in the inner cavity of the pipe body through the flange exhaust port 1902.

[0050] The product structure principle of the present invention: The test device for simulating ion corrosion of the PCCP protective layer provided by the present invention is a test device for simulating ion corrosion of the protective layer of a prestressed steel cylinder concrete pipe (PCCP) under load. It works through an external internal pressure loading machine 16, a PCCP pipe body 13, a number of solution corrosion containers 5 and other cooperating components. The PCCP pipe body 13 acts as a simulated PCCP protective layer, and the solution corrosion container 5 acts as a container for containing the corrosive solution used for testing.

[0051] Each test device can perform testing work independently, and can also be compared with other test devices in the same partition or different partitions without affecting each other.

[0052] The rear side of the solution erosion container 5 is in close contact with the circumferential surface of the PCCP tube body 13 (simulating the PCCP protective layer), and the solution erosion container 5 is provided with a plurality of transparent windows 501; the inner cavity of the solution erosion container 5 can be connected to the solution placement barrel 1 downward, and can be connected to the liquid level display barrel 10 or the blower 7 upward; the solution placement barrel has a built-in water pump, and the pump body is connected to the liquid level display barrel 10 through a hose; the solution erosion container 5 can realize the dry-wet cycle of the PCCP tube body 13 (simulating the PCCP protective layer) with the help of the water pump 12 and the blower 7; the liquid erosion container 5 can also realize remote page monitoring with the help of a camera. Compared with the prior art, this test device creates a process that can simulate the ion erosion protective layer of the PCCP under the real load state, reduces the infrastructure cost and the amount of erosion solution, and solves the problem of different erosion solutions communicating with each other, and can comprehensively consider the effects of various factors such as solution type and concentration, coating type and thickness, long-term immersion, dry-wet cycle and cathodic protection on the durability of PCCP. The PCCP pipe body 13 represents a prestressed concrete cylinder pipe, referred to as PCCP, and its full English name is Prestressed Concrete Cylinder Pipe.

[0053] During the implementation process, the inner water pressure can be applied to the inner wall of the PCCP pipe body 13 by a pressure-applying device such as an internal pressure loader 16, thereby simulating the actual load state of the PCCP protective layer. The PCCP pipe body 13 is divided into N partitions by a scaffold, and each partition is divided into M test partitions by M solution erosion containers 5 arranged thereon, and each test partition can be configured with an independent test solution or coated with a specific protective coating or subjected to dry and wet treatments. Preferably, N=4, M=3, i.e., there are 4 partitions in total, and each partition is provided with 3 solution erosion containers 5 and is correspondingly divided into 3 three test areas (A, B, C), i.e., each solution erosion container 5 or the test device corresponds to an independent test partition, and the test partitions A, B, and C of each partition can be subjected to independent erosion or comparison tests.

[0054] Of course, different test zones in the same zone are undoubtedly best tested in the same column, so that different ion test solutions with different concentrations can be tested, and whether there is a protective coating or whether dry and wet treatments have been done can be tested, so as to compare and contrast different test results, thereby assisting subsequent analysis. The PCCP protective layer multi-zone independent erosion device can use one PCCP tube to realize the multi-factor influence analysis of ion erosion.

[0055] The test method adopted in the present disclosure can be determined according to actual needs, or a test plan can be specified according to Table 1 below and then implemented. Specifically, it can be implemented according to the following steps:

[0056] S1 formulates a test plan: Zone I performs a comparison of sulfate ion corrosion at different concentrations, Zone II performs a comparison of chloride ion corrosion at different concentrations, Zone III performs a comparison of different protective measures, and Zone IV performs a mixed comparison test, as shown in Table 1.

[0057] S2 formulates a multi-factor corrosion comparison plan and sets test plans to be executed in different partitions or different test devices. The specific plan can be as follows:

[0058] The three solution storage barrels 1 set in partition I are respectively configured with 1% concentration Na2SO4 solution, 3% concentration Na2SO4 solution, and 5% concentration Na2SO4 solution, corresponding to the three test areas (A, B, C) of partition I.

[0059] The three solution placement barrels 1 set in the partition II are respectively configured with a 1% concentration NaCl solution, a 3% concentration NaCl solution, and a 5% concentration NaCl solution, which correspond to the three test areas (A, B, and C) of the partition II.

[0060] The three solution placement barrels 1 set in the partition III are firstly prepared with 5% concentration NaCl solution, and the three test areas (A, B, C) on the partition III are coated with protective coating 1, protective coating 2, and protective coating 3 respectively. The protective coating 1, protective coating 2, and protective coating 3 are determined according to actual needs, and they only need to be different types. The selection of protective coatings here is a common method in the art and is used for protection testing.

[0061] The three solution placement barrels 1 set in partition IV are respectively configured with 5% NaCl solution, 5% Na2SO4 solution, and a mixed solution of 5% NaCl and 5% Na2SO4, corresponding to the three test areas (A, B, C) of partition III; among them, the test areas (A, B) need to be subjected to dry-wet cycle treatment respectively.

[0062] S3: Fill the inner cavity of the pipe body with water: start the inner pressure loading machine 16, and inject water into the inner cavity of the pipe body through the water pipe 18, so that the inner wall of the PCCP pipe body 13 is completely soaked in water, and the air in the inner cavity of the pipe body is discharged. The inner water pressure gauge 17 continuously monitors the water pressure inside the water pipe 18; thereby keeping the inner wall of the PCCP pipe body 13 continuously under the internal water pressure.

[0063] S4 sets parameters: Each test area that needs to be treated with dry-wet cycles is defined as a dry-wet cycle area, the upper limit of the dry-wet cycle treatment is set to L times, and the number of dry-wet cycle treatments currently executed is defined as Seq, and Seq is initialized to 0, that is, the three test areas (A, B, C) of partition III and the two test areas (A, B) of partition IV are each a dry-wet cycle area, and L dry-wet cycles are performed respectively, and Seq is used to represent the number of dry-wet cycle treatments that have been performed. L depends on actual needs. For example, L=10 means that the dry-wet cycle treatments need to be cycled 10 times.

[0064] S5 filling: for the test device corresponding to each test area, perform the following filling operations respectively - turn on the water pump 12, extract the solution configured in the solution placement barrel 1, and the configured solution flows from bottom to top into the liquid level display barrel 10 through the liquid suction hose 11, and flows into the solution erosion container 5; if the solution erosion container 5 is full, turn off the water pump 12, and observe whether the solution erosion container 5 is full through the liquid level display barrel 10.

[0065] S6 Wet-dry cycle: soak each wet-dry cycle area for N days and dry for M days. Specifically, for the test device corresponding to each wet-dry cycle area, first keep the solution erosion container 5 with the configured liquid for N days, that is, soak; then open the liquid outlet 3 to discharge the solution in the solution erosion container 5, and turn on the blower 7 to keep the wet-dry cycle area dry for M days, that is, dry; finally, Seq is increased by 1, and the wet-dry operation of this cycle is included. N and M can be determined according to actual needs. For example, N=2 and M=1, it means that each wet-dry cycle treatment needs to be soaked for 2 days and dried for 1 day.

[0066] S7 determines whether the dry-wet cycle should be ended: if Seq=L, it means that the current number of dry-wet cycles has reached the cycle upper limit, so continue S8; otherwise, it means that all dry-wet cycle processing has not been completed, so return to S5.

[0067] S8 Sampling: After a certain time interval, the transparent window 501 is removed and a water drill is used to extract several core samples from the PCCP pipe body 13; then the drill hole is sealed and the transparent window 501 is installed again, so that it can be reused to perform other test schemes.

[0068] S9 analysis: All core samples are processed into slices; each slice of the core sample is ground, the chloride ion concentration is determined by titration, the sulfate ion concentration is measured by weighing, and the concentration of ions intruding into the core sample is plotted as a function of depth, and the test results of different partitions are compared. The slice thickness can be 3mm.

[0069]

[0070] Table 1

[0071] In summary, through the unique design of the present disclosure, the present disclosure solves the process simulation of ion corrosion of the PCCP protective layer under real load conditions, explores the key factors affecting the corrosion effect, and also avoids the problem of low load levels caused by the brittleness and discreteness of concrete in ion corrosion tests under general loads, reflecting the high tensile strain characteristics of the PCCP protective layer, and realizing the study of ion corrosion characteristics under long-term real loads and multiple factors, and more accurately reveals the time-varying law of ion corrosion PCCP protection. The present disclosure uses a no-load immersion test as a control group, and with the help of a PCCP internal pressure loading device, designs a multi-partitioned independent ion corrosion device on the surface of the protective layer, and can consider load, single chloride / sulfate ion corrosion, coupled ion corrosion, ion concentration, dry-wet cycle and surface protection measures to carry out prototype test research on ion corrosion under long-term high internal pressure.

[0072] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A test device for simulating ion erosion of a PCCP protective layer, characterized in that: The invention comprises a solution erosion container (5), wherein the solution erosion container (5) is provided with a container inner cavity, and the solution erosion container (5) is arranged on the circumferential surface of a PCCP tube body (13); the rear side surface of the solution erosion container (5) is in close contact with the circumferential surface of the PCCP tube body (13), and the front side surface of the solution erosion container (5) is provided with a plurality of transparent windows (501); the container inner cavity is connected downwardly to a solution placement barrel (1) and upwardly to a liquid level display barrel (10), and a liquid extraction hose (11) is connected between the interior of the liquid level display barrel (10) and the interior of the solution placement barrel (1); The lower end of the liquid extraction hose (11) located inside the solution placement barrel (1) is connected to a water extraction pump (12), and the inner cavity of the container is further connected to a blower (7); The PCCP tube body (13) is sleeved on the outside of the steel inner liner (20); a base (2001) is provided at the bottom of the steel inner liner (20); the bottom of the PCCP tube body (13) is in close contact with the top of the base (2001); the space enclosed between the inner wall of the PCCP tube body (13) and the outer wall of the steel inner liner (20) forms an inner cavity of the tube body; a layered scaffold (15) is erected around the PCCP tube body (13); the PCCP tube body (13) is subdivided into a plurality of partitions by the scaffold (15); a plurality of solution erosion containers (5) are provided on the circumferential surface of each partition; The top of the PCCP pipe body (13) is connected to a PCCP pipe exhaust port (14), and the bottom of the PCCP pipe body (13) is connected to an internal pressure loading machine (16) via a water pipe (18), and the water pipe (18) is provided with an internal water pressure gauge (17).

2. The testing device according to claim 1, characterized in that: The front side of the solution erosion container (5) is provided with three transparent windows (501), and the left and right sides of the transparent windows (501) are provided with vertical sealing strips (4).

3. The testing device according to claim 1, characterized in that: The solution erosion container (5) is made of a rust-proof shell, and the transparent window (501) is made of a transparent PC board.

4. The testing device according to claim 1, characterized in that: The upper and lower sides of the solution erosion container (5) are respectively provided with clamps (2) for fixing the container on the circumferential surface of the PCCP pipe body (13).

5. The testing device according to claim 1, characterized in that: A rainproof pressure plate (9) is provided on the top of the liquid level display barrel (10), and an exhaust port (8) is provided on the rainproof pressure plate (9), and the exhaust port (8) is connected to the inside of the liquid level display barrel (10).

6. The testing device according to claim 1, characterized in that: One or more blast holes are provided at the top of the inner cavity of the container, and the blower (7) is connected to the inner cavity of the container via a three-way connecting pipe (6) or one or more conduits through the corresponding blast holes.

7. The testing device according to claim 1, characterized in that: A liquid discharge port (3) is provided at the bottom of the inner cavity of the container, and the liquid discharge port (3) is connected to the solution placement barrel (1); a liquid inlet is provided at the top of the inner cavity of the container, and the liquid inlet is connected to the liquid level display barrel (10).

8. The testing device according to claim 1, characterized in that: The PCCP pipe body (13) is subdivided into four partitions, namely, partition I, partition II, partition III, and partition IV; each partition of the PCCP pipe body (13) is provided with three solution erosion containers (5); therefore, each partition is divided into three test areas (A, B, C) by the three solution erosion containers (5) provided therein, and each test area corresponds to one test device.

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