CN109187325B - Accelerated simulation experiment device and method for corrosion fracture process of PCCP (prestressed concrete cylinder pipe) - Google Patents
Accelerated simulation experiment device and method for corrosion fracture process of PCCP (prestressed concrete cylinder pipe) Download PDFInfo
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- CN109187325B CN109187325B CN201811218654.6A CN201811218654A CN109187325B CN 109187325 B CN109187325 B CN 109187325B CN 201811218654 A CN201811218654 A CN 201811218654A CN 109187325 B CN109187325 B CN 109187325B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
Abstract
The invention provides an accelerated simulation experiment device and method for a corrosion and fracture process of a PCCP (prestressed concrete cylinder pipe), and relates to the technical field of durability tests of hydraulic structures, wherein the accelerated simulation experiment device for the corrosion and fracture process of the PCCP comprises a container, a conductor and a power supply, wherein: the container is used for containing the corrosive solution and is provided with an opening, and the opening is used for realizing the contact of the corrosive solution and the prestressed steel wire on the PCCP pipe; the conductor is immersed in the corrosive solution; the positive pole of power is connected with the conductor, and the negative pole of power is connected with the prestressing force wire on the PCCP pipe, or the positive pole of power is connected with the prestressing force wire on the PCCP pipe, the negative pole of power with the conductor is connected. When the accelerated simulation experiment device for the corrosion fracture process of the PCCP pipe is used, the fracture process of the prestressed steel wire is fast, artificially introduced noise signals do not exist in the experiment process, and the acoustic emission characteristics of the pipe wall structure at the wire fracture moment can be correctly reflected.
Description
Technical Field
The invention relates to the technical field of hydraulic structure durability tests, in particular to an accelerated simulation experiment device and method for a corrosion fracture process of a PCCP (prestressed concrete cylinder pipe).
Background
The PCCP pipe is a prestressed steel cylinder concrete pipe and is mainly used for long-distance pressure water delivery engineering. The inner diameter of the pipeline is 1.0-4.0 m. The pipe wall structure comprises pipe core concrete, a steel cylinder, prestressed steel wires and a mortar protective layer. The steel cylinder mainly plays a role in seepage prevention, the tube core concrete plays a role in supporting the rigidity of the tube wall, the prestressed steel wires and the tube core concrete are main stress structures, and the mortar protective layer is used for protecting the prestressed steel wires from being corroded.
The PCCP pipe is corroded by underground water in a long-term operation state, and the prestressed steel wires in the pipe wall are broken, so that the pipe core concrete is cracked, pipe explosion accidents are further induced, and water supply safety and public safety are threatened.
At present, in order to research a method suitable for monitoring broken wires of a PCCP, the broken wire process of the PCCP is often simulated under a model experiment condition, and a vibration signal caused by the broken wires is monitored by an optical fiber sensor. Since the actual process of the PCCP pipe wire breaking is very slow, the conventional accelerated simulation wire breaking method includes: 1. manually cutting off the steel wire by using mechanical equipment; 2. the pipe wall is provided with a hole and connected with a branch pipe, and the influence of broken wires and leakage is simulated by controlling a valve on the branch pipe; 3. by knocking the pipe wall, acoustic emission signals formed by broken wires are simulated. However, the above technical solutions have the following problems: the former two methods of simulating the broken wire are difficult to accurately express the natural broken wire signal of the PCCP pipe due to the introduction of the noise signal caused by manual operation, and the latter method cannot accurately reflect the structural characteristics of the pipe wall at the broken wire moment, so that great difficulty is brought to the model test of monitoring the broken wire of the PCCP.
Disclosure of Invention
The invention aims to provide an accelerated simulation experiment device and method for a PCCP pipe corrosion fracture process, which are used for quickly fracturing a prestressed steel wire, have no artificially introduced noise signal in the experiment process and can accurately reflect the pipe wall structure characteristics at the moment of wire fracture. In addition, the accelerated simulation experiment method for the corrosion and fracture process of the PCCP pipe is provided by using the accelerated simulation experiment device for the corrosion and fracture process of the PCCP pipe.
In a first aspect, the present invention provides an accelerated simulation experiment apparatus for a PCCP pipe corrosion fracture process, including a container, a conductor and a power supply, wherein:
the container is used for containing an etching solution, and is provided with an opening which is used for realizing the contact of the etching solution and the prestressed steel wire on the PCCP pipe;
the conductor is immersed in the corrosion solution;
the positive pole of the power supply is connected with the conductor, the negative pole of the power supply is connected with the prestressed wire on the PCCP pipe, or the positive pole of the power supply is connected with the prestressed wire on the PCCP pipe, and the negative pole of the power supply is connected with the conductor.
Further, a supporting piece for supporting the conductor is arranged in the container.
Further, the device also comprises an air supply device used for supplying oxygen-containing gas into the corrosion solution.
Further, the air supplement unit comprises a pump body and an air supply pipe, one end of the air supply pipe is connected with the pump body, and the other end of the air supply pipe extends into the container.
And further, the pipe joint also comprises a plug assembly for plugging two ends of the PCCP pipe, and a space for containing water is formed between the plug assembly and the PCCP pipe.
In a second aspect, the present invention further provides an accelerated simulation experiment method for a PCCP pipe corrosion fracture process, where the accelerated simulation experiment apparatus for a PCCP pipe corrosion fracture process according to the above-mentioned scheme is adopted, and includes:
stripping off the mortar protective layer of the PCCP pipe part to expose the prestressed steel wire;
connecting the positive pole of the power supply with the conductor, and connecting the negative pole of the power supply with the prestressed steel wire, or connecting the positive pole of the power supply with the prestressed steel wire, and connecting the negative pole of the power supply with the conductor;
and immersing the prestressed steel wire into a corrosion solution.
When the positive pole of the power supply is connected with the conductor, the negative pole of the power supply is connected with the prestressed steel wire, and the prestressed steel wire is immersed in the corrosive solution, the method further comprises the following steps:
and supplementing hydrogen-containing gas into the corrosive solution.
Further, when the positive pole of power is connected with prestressing wire, the negative pole of power with the conductor is connected, still include:
and supplementing oxygen-containing gas into the etching solution.
Further, still include:
filling water into the PCCP pipe;
blocking both ends of the PCCP tube.
And further, covering soil bodies on the periphery of the PCCP pipe.
The accelerated simulation experiment device and method for the corrosion and fracture process of the PCCP pipe provided by the invention can produce the following beneficial effects:
the positive pole and the negative pole of the power supply in the accelerated simulation experiment device for the corrosion and fracture process of the PCCP pipe are respectively connected with the conductor and the prestressed steel wires on the PCCP pipe one by one. When the accelerated simulation experiment device for the corrosion and fracture process of the PCCP pipe is used, the positive electrode and the negative electrode of a power supply can be respectively connected with the conductor and the prestressed steel wire on the PCCP pipe, and the prestressed steel wire is immersed in a corrosion solution through the opening on the container so as to simulate the hydrogen embrittlement type accelerated corrosion and fracture process of the prestressed steel wire; the positive pole and the negative pole of the power supply can be respectively connected with the prestressed steel wire and the conductor on the PCCP pipe, and the prestressed steel wire is immersed into the corrosive solution through the opening on the container so as to simulate the accelerated corrosion fracture process of the prestressed steel wire anode dissolution type.
Compared with the prior art, the corrosion solution in the container of the accelerated simulation experiment device for the PCCP pipe corrosion fracture process can accelerate corrosion of the prestressed steel wire, meanwhile, the power supply can be connected with the prestressed steel wire and the conductor on the PCCP pipe, the fracture process of the prestressed steel wire is further accelerated, no artificially introduced noise signal exists in the experiment process, the sound emission characteristics of the pipe wall structure at the moment of wire fracture can be accurately reflected, and the smooth implementation of a PCCP wire fracture monitoring model test is facilitated.
Compared with the prior art, the accelerated simulation experiment method for the corrosion and fracture process of the PCCP pipe provided by the second aspect of the invention is simple to operate and low in cost, no artificially introduced noise signal exists in the detection process, the acoustic emission characteristics of the pipe wall structure at the wire breaking moment can be correctly reflected, and the experiment result is more real.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an accelerated simulation experiment apparatus for a corrosion fracture process of a PCCP pipe according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a second embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a third embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to a fourth embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to a fifth embodiment of the present invention;
fig. 7 is a schematic flowchart of an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a sixth embodiment of the present invention.
Icon: 1-a container; 11-etching solution; 2-a conductor; 3-a power supply; 4-PCCP pipe; 41-prestressed steel wire; 5-a support member; 6-a gas supplementing device; 61-a pump body; 62-gas pipe; 7-plug assembly.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a schematic structural diagram of an accelerated simulation experiment apparatus for a corrosion fracture process of a PCCP pipe according to an embodiment of the present invention; FIG. 2 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to an embodiment of the present invention; FIG. 3 is a schematic flow chart illustrating an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a second embodiment of the present invention; FIG. 4 is a schematic flow chart illustrating an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a third embodiment of the present invention; FIG. 5 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to a fourth embodiment of the present invention; FIG. 6 is a schematic flow chart illustrating an accelerated simulation experiment method for a corrosion fracture process of a PCCP pipe according to a fifth embodiment of the present invention; fig. 7 is a schematic flowchart of an accelerated simulation experiment method for a PCCP pipe corrosion fracture process according to a sixth embodiment of the present invention.
The present embodiment aims to provide an accelerated simulation experiment device for a PCCP pipe 4 corrosion fracture process, as shown in fig. 1 and 2, comprising a container 1, a conductor 2 and a power supply 3, wherein:
the container 1 is used for containing the corrosive solution 11, and the container 1 is provided with an opening which is used for realizing the contact between the corrosive solution 11 and the prestressed steel wire 41 on the PCCP pipe 4;
the conductor 2 is immersed in the etching solution 11;
the positive pole of power 3 is connected with conductor 2, and the negative pole of power 3 is connected with prestressing wire 41 on PCCP pipe 4, or the positive pole of power 3 is connected with prestressing wire 41 on PCCP pipe 4, and the negative pole of power 3 is connected with conductor 2.
The positive pole and the negative pole of the power supply in the accelerated simulation experiment device for the corrosion and fracture process of the PCCP pipe are respectively connected with the conductor and the prestressed steel wires on the PCCP pipe one by one. Namely, when the accelerated simulation experiment device of the corrosion fracture process of the PCCP pipe 4 is used, the positive electrode and the negative electrode of the power supply 3 can be respectively connected with the conductor 2 and the prestressed steel wire 41 on the PCCP pipe 4, and the prestressed steel wire 41 is immersed in the corrosion solution 11 through the opening on the container 1, so as to simulate the hydrogen embrittlement accelerated corrosion fracture process of the prestressed steel wire 41; the positive pole and the negative pole of the power supply 3 can also be respectively connected with the prestressed steel wire 41 and the conductor 2 on the PCCP pipe 4, and the prestressed steel wire 41 is immersed in the corrosive solution 11 through the opening on the container 1, so as to simulate the accelerated corrosion cracking process of the anode dissolution type of the prestressed steel wire 41.
Compared with the prior art, the corrosion solution 11 in the container 1 of the accelerated simulation experiment device for the corrosion and fracture process of the PCCP pipe 4 provided by the embodiment of the first aspect of the invention can accelerate corrosion of the prestressed steel wire 41, and meanwhile, the power supply 3 can be connected with the prestressed steel wire 41 and the conductor 2 on the PCCP pipe 4, so that the fracture process of the prestressed steel wire 41 is further accelerated, no artificially introduced noise signal exists in the experiment process, the acoustic emission characteristics of the pipe wall structure at the time of wire fracture can be accurately reflected, and smooth performance of a PCCP wire fracture monitoring model test is facilitated.
The etching solution 11 may be sulfuric acid, hydrochloric acid, nitric acid, or other etching solutions 11.
When in use, as shown in fig. 1, the container 1 may be reversely buckled on the PCCP pipe 4 in the form of a pipeline, or may also be in a barrel structure, so that the PCCP pipe 4 can be placed thereon, that is, the form of the container 1 may be various, and thus, the description thereof is omitted.
In some embodiments, as shown in fig. 1, in order to facilitate the arrangement of the conductor 2, a support 5 for supporting the conductor 2 is provided inside the container 1. The support 5 may be a concrete block or a bracket made of other corrosion-resistant materials.
In at least one embodiment, the conductor 2 is a stainless steel plate. The conductor 2 may also be of other conductive materials with better corrosion resistance, such as conductive ceramics.
In some embodiments, as shown in fig. 1, in order to better simulate the anodic dissolution type accelerated corrosion cracking process of the prestressed steel wire 41, the accelerated simulation experiment apparatus for the corrosion cracking process of the PCCP pipe 4 further includes an air supply device 6 for supplying an oxygen-containing gas into the corrosion solution 11. The gas supply device 6 can provide sufficient oxygen for the corrosion solution 11, and the fracture of the prestressed steel wire 41 is accelerated.
The oxygen-containing gas may be air, oxygen, or a mixture of oxygen and other inert gases.
It should be noted that all the structures capable of supplying the oxygen-containing gas into the etching solution 11 may be the gas supply device 6 mentioned in the above embodiments, such as an air pump, an oxygen pump, and so on.
As shown in fig. 1, the air supply device 6 includes a pump body 61 and an air supply pipe 62, one end of the air supply pipe 62 is connected to the pump body 61, and the other end of the air supply pipe 62 extends into the container 1. The pump body 61 can be directly communicated with the outside air, and the air pipe 62 continuously replenishes the air into the corrosive solution 11. In order to make the structure of the air delivery pipe 62 more stable, the air delivery pipe may be connected with the support member 5.
In some embodiments, the accelerated simulation experiment apparatus for the corrosion fracture process of the PCCP pipe 4 further includes a plug assembly 7 for plugging two ends of the PCCP pipe 4, and a space for containing water is formed between the plug assembly 7 and the PCCP pipe 4. Before the experiment, water can be filled into the PCCP pipe 4 and pressurized, and meanwhile, the two ends of the PCCP pipe 4 are plugged by using the plug assemblies 7, so that the using state of the PCCP pipe 4 is fully simulated.
The plug assembly 7 may include a left plug and a right plug, and the left plug and the right plug may also be of an integrated structure.
On the basis of the above embodiment, as shown in fig. 1, before the experiment, a soil body may be covered around the PCCP pipe 4, so as to better simulate the real use state of the PCCP pipe 4.
An embodiment of a second aspect of the present invention provides an accelerated simulation experiment method for a PCCP pipe corrosion fracture process, which employs an accelerated simulation experiment apparatus for a PCCP pipe 4 corrosion fracture process in any embodiment of the first aspect, and includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 in the corrosive solution 11;
and/or step S103, connecting the positive pole of the power supply 3 with the prestressed steel wire 41, connecting the negative pole of the power supply 3 with the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11.
Compared with the prior art, the accelerated simulation experiment method for the corrosion and fracture process of the PCCP pipe 4 provided by the embodiment is simple to operate and low in cost, no artificially introduced noise signal exists in the detection process, the acoustic emission characteristics of the pipe wall structure at the silk breaking moment can be correctly reflected, and the experiment result is more real.
In some embodiments, in order to accelerate the fracture of the prestressed steel wire 41 when simulating the hydrogen embrittlement type accelerated corrosion fracture of the prestressed steel wire 41, that is, when the positive electrode of the power supply 3 is connected to the conductor 2 and the negative electrode of the power supply 3 is connected to the prestressed steel wire 41 and the prestressed steel wire 41 is immersed in the corrosion solution, the accelerated simulation experiment method for the PCCP pipe corrosion fracture process further includes step S104 of supplying a hydrogen-containing gas into the corrosion solution to provide sufficient hydrogen gas to the corrosion solution 11 to accelerate the fracture of the prestressed steel wire 41.
The hydrogen-containing gas may be hydrogen gas or a mixture of hydrogen gas and other inert gases, for example, the hydrogen-containing gas is a mixture of hydrogen gas and helium gas, the hydrogen gas accounts for 60% -80%, and the specific hydrogen gas accounts for 60%, 70%, 80%.
In some embodiments, in order to accelerate the rupture of the prestressed steel wire 41 when simulating the accelerated corrosion rupture process of the dissolution type of the anode of the prestressed steel wire 41, that is, when the anode of the power supply 3 is connected to the prestressed steel wire 41 and the cathode of the power supply 3 is connected to the conductor 2, the accelerated simulation experiment method for the corrosion rupture process of the PCCP pipe further includes a step S105 of supplementing an oxygen-containing gas into the corrosion solution 11 to provide sufficient oxygen in the corrosion solution 11 to accelerate the rupture of the prestressed steel wire 41.
The oxygen-containing gas may be air, oxygen, or a mixture of oxygen and other inert gases.
In some embodiments, in order to fully simulate the use state of the PCCP pipe 4, the accelerated simulation test method for the corrosion fracture process of the PCCP pipe further includes:
step S106, filling water into the PCCP pipe 4;
step S107, the two ends of the PCCP pipe 4 are plugged.
The steps can simulate the use environment of the PCCP pipe 4, and the stability of the use environment can be ensured.
In some embodiments, in order to better simulate the use condition of the PCCP pipe 4, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe further includes:
and step S108, covering soil bodies on the periphery of the PCCP pipe 4.
It should be noted that the steps S101, S102, S103, S104, S105, S106, S107, and S108 are not limited to the accelerated simulation test method for the PCCP pipe 4 corrosion fracture process being performed in order of the numerical sequence of the steps, and the steps in the accelerated simulation test method for the PCCP pipe 4 corrosion fracture process may be combined in any order when the technology allows. Namely, the technical method combined by the claims of the invention is within the protection scope of the invention. The invention will be further described with reference to specific examples.
The first embodiment is as follows:
as shown in fig. 2, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 provided by the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 in the corrosive solution 11.
The specific operation process is as follows:
in step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S102 is performed, the positive electrode of the power supply 3 is connected to the conductor 2, the negative electrode of the power supply 3 is connected to the prestressed steel wire 41, and the prestressed steel wire 41 is immersed in the corrosive solution 11 to simulate the hydrogen embrittlement type accelerated corrosion fracture process of the prestressed steel wire 41, and the experimental data is recorded.
Example two:
as shown in fig. 3, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 provided by the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S103, connecting the positive electrode of the power supply 3 to the prestressed steel wire 41, connecting the negative electrode of the power supply 3 to the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11.
The specific operation process is as follows:
in step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S103 is performed, the positive electrode of the power supply 3 is connected to the prestressed steel wire 41, the negative electrode of the power supply 3 is connected to the conductor 2, and the prestressed steel wire 41 is immersed in the corrosive solution 11 to simulate the accelerated corrosion cracking process of the anode dissolution type of the prestressed steel wire 41, and the experimental data is recorded.
Example three:
as shown in fig. 4, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 according to the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 in the corrosive solution 11;
step S103, connecting the positive electrode of the power supply 3 to the prestressed steel wire 41, connecting the negative electrode of the power supply 3 to the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11.
The specific operation process is as follows:
in step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S102 is performed, the positive electrode of the power supply 3 is connected with the conductor 2, the negative electrode of the power supply 3 is connected with the prestressed steel wire 41, and the prestressed steel wire 41 is immersed in the corrosive solution 11 to simulate the hydrogen embrittlement type accelerated corrosion fracture process of the prestressed steel wire 41, and the experimental data is recorded; the PCCP pipe 4 in the corrosion solution 11 may be taken out, and step S103 is performed to connect the positive electrode of the power supply 3 to the prestressed steel wire 41, connect the negative electrode of the power supply 3 to the conductor 2, immerse the prestressed steel wire 41 in the corrosion solution 11, simulate the accelerated corrosion fracture process of the anode dissolution type of the prestressed steel wire 41, and record experimental data.
Example four:
as shown in fig. 5, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 according to the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 in the corrosive solution 11;
step S103, connecting the positive pole of the power supply 3 with the prestressed steel wire 41, connecting the negative pole of the power supply 3 with the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11;
step S106, filling water into the PCCP pipe 4;
step S107, blocking both ends of the PCCP pipe 4;
and step S108, covering soil bodies on the periphery of the PCCP pipe 4.
In step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S102 is performed, the positive electrode of the power supply 3 is connected with the conductor 2, the negative electrode of the power supply 3 is connected with the prestressed steel wire 41, and the prestressed steel wire 41 is immersed in the corrosive solution 11 to simulate the hydrogen embrittlement type accelerated corrosion fracture process of the prestressed steel wire 41, and the experimental data is recorded; then, the PCCP pipe 4 in the corrosion solution 11 can be taken out, step S103 is performed, the positive electrode of the power supply 3 is connected with the prestressed steel wire 41, the negative electrode of the power supply 3 is connected with the conductor 2, the prestressed steel wire 41 is immersed in the corrosion solution 11, so as to simulate the accelerated corrosion fracture process of the anode dissolution type of the prestressed steel wire 41, and experimental data is recorded; subsequently, step S106 is performed to fill the PCCP pipe 4 with water, which may be high-pressure water, and step S107 is performed to block both ends of the PCCP pipe 4; and finally, step S108 is carried out, soil is covered on the periphery of the PCCP pipe 4, and the use environment of the PCCP pipe 4 is fully simulated.
In the fourth embodiment, step S107 may be performed to block both ends of the PCCP pipe 4 and leave a water inlet and an air outlet, and then step S106 may be performed to fill water into the PCCP pipe 4, in which step the water may be pressurized to ensure that the PCCP pipe 4 contains a water solution with a certain pressure, and after the water is filled, the water inlet and the air outlet may be sealed.
Example five:
as shown in fig. 6, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 according to the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S106, filling water into the PCCP pipe 4;
step S107, blocking both ends of the PCCP pipe 4;
step S108, covering a soil body on the periphery of the PCCP pipe 4;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 into the corrosive solution 11;
step S103, connecting the positive electrode of the power supply 3 to the prestressed steel wire 41, connecting the negative electrode of the power supply 3 to the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11.
In step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S106 is performed to fill the PCCP pipe 4 with water, which may be high-pressure water, and step S107 is performed to block both ends of the PCCP pipe 4; step S108 is carried out, soil is covered on the periphery of the PCCP pipe 4, and the use environment of the PCCP pipe 4 is fully simulated; subsequently, step S102 is performed, the positive electrode of the power supply 3 is connected with the conductor 2, the negative electrode of the power supply 3 is connected with the prestressed steel wire 41, and the prestressed steel wire 41 is immersed in the corrosive solution 11 to simulate the hydrogen embrittlement type accelerated corrosion fracture process of the prestressed steel wire 41, and the experimental data is recorded; the PCCP pipe 4 in the corrosion solution 11 may be taken out, and step S103 is performed to connect the positive electrode of the power supply 3 to the prestressed steel wire 41, connect the negative electrode of the power supply 3 to the conductor 2, immerse the prestressed steel wire 41 in the corrosion solution 11, simulate the accelerated corrosion fracture process of the anode dissolution type of the prestressed steel wire 41, and record experimental data.
In the fifth embodiment, it should be noted that step S107 may be performed to block both ends of the PCCP pipe 4 and leave a water inlet and an air outlet, and then step S106 may be performed to fill water into the PCCP pipe 4, in which step the water may be pressurized to ensure that the PCCP pipe 4 contains a water solution with a certain pressure, and after the water is filled, the water inlet and the air outlet may be sealed.
Example six:
as shown in fig. 7, the accelerated simulation experiment method for the corrosion fracture process of the PCCP pipe 4 according to the present invention includes:
step S101, stripping off a part of mortar protective layer of the PCCP (prestressed concrete cylinder pipe) 4 to expose the prestressed steel wire 41;
step S106, filling water into the PCCP pipe 4;
step S107, blocking both ends of the PCCP pipe 4;
step S108, covering a soil body on the periphery of the PCCP pipe 4;
step S102, connecting the positive electrode of the power supply 3 with the conductor 2, connecting the negative electrode of the power supply 3 with the prestressed steel wire 41, and immersing the prestressed steel wire 41 in the corrosive solution 11;
step S104, supplying hydrogen-containing gas into the etching solution 11;
step S103, connecting the positive pole of the power supply 3 with the prestressed steel wire 41, connecting the negative pole of the power supply 3 with the conductor 2, and immersing the prestressed steel wire 41 in the corrosive solution 11;
in step S105, an oxygen-containing gas is supplied to the etching solution 11.
In step S101, a part of the mortar protection layer of the PCCP pipe 4 is stripped to expose the prestressed steel wires 41, and the mortar protection layer of a local specific part of the PCCP pipe 4 can be stripped by placing the PCCP pipe 4 under a specific boundary supporting condition; subsequently, step S106 is performed to fill the PCCP pipe 4 with water, which may be high-pressure water, and step S107 is performed to block both ends of the PCCP pipe 4; step S108 is carried out, soil is covered on the periphery of the PCCP pipe 4, and the use environment of the PCCP pipe 4 is fully simulated; subsequently, step S102 is performed, in which the positive electrode of the power supply 3 is connected to the conductor 2, the negative electrode of the power supply 3 is connected to the prestressed steel wire 41, and the prestressed steel wire 41 is immersed in the corrosive solution 11; then, step S104 is carried out, hydrogen-containing gas is supplemented into the corrosive solution 11, so as to more quickly simulate the hydrogen embrittlement accelerated corrosion fracture process of the prestressed steel wire 41, and experimental data are recorded; subsequently, step S103 is performed, in which the positive electrode of the power supply 3 is connected to the prestressed steel wire 41, the negative electrode of the power supply 3 is connected to the conductor 2, and the prestressed steel wire 41 is immersed in the corrosive solution 11; finally, step S105 is performed to supplement oxygen-containing gas into the etching solution 11 to more rapidly simulate the accelerated corrosion cracking process of the dissolution type of the anode of the prestressed steel wire 41, and the experimental data is recorded.
In the sixth embodiment, step S107 may be performed to block both ends of the PCCP pipe 4 and leave a water inlet and an air outlet, and then step S106 may be performed to fill water into the PCCP pipe 4, in which step the water may be pressurized to ensure that the PCCP pipe 4 contains a water solution with a certain pressure, and after the water is filled, the water inlet and the air outlet may be sealed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The accelerated simulation experiment device for the corrosion and fracture process of the PCCP (prestressed concrete cylinder pipe) is characterized by comprising a container, a conductor and a power supply, wherein:
the container is used for containing a corrosive solution and is provided with an opening, the container is buckled on a prestressed steel wire of the PCCP, and the opening is used for realizing the contact between the corrosive solution and the prestressed steel wire on the PCCP;
the conductor is immersed in the corrosion solution;
the positive pole of the power supply is connected with the conductor, the negative pole of the power supply is connected with the prestressed wire on the PCCP pipe, or the positive pole of the power supply is connected with the prestressed wire on the PCCP pipe, and the negative pole of the power supply is connected with the conductor;
the device also comprises a plug assembly used for plugging two ends of the PCCP, a space used for containing high-pressure water is formed between the plug assembly and the PCCP, or a soil body is covered outside the PCCP and used for applying pressure to the PCCP.
2. The PCCP pipe corrosion cracking process accelerated simulation experimental setup of claim 1, wherein a support for supporting the conductor is provided inside the container.
3. The PCCP pipe corrosion cracking process accelerated simulation experimental apparatus of claim 1, further comprising an air supply device for supplying an oxygen-containing gas into the corrosion solution.
4. The PCCP pipe corrosion cracking process accelerated simulation experiment device of claim 3, wherein the air supplement device comprises a pump body and an air delivery pipe, one end of the air delivery pipe is connected with the pump body, and the other end of the air delivery pipe extends into the container.
5. An accelerated simulation test method for a PCCP pipe corrosion cracking process, which employs the accelerated simulation test device for a PCCP pipe corrosion cracking process according to any one of claims 1 to 4, and comprises:
stripping off the mortar protective layer of the PCCP pipe part to expose the prestressed steel wire;
connecting the positive pole of the power supply with the conductor, connecting the negative pole of the power supply with the prestressed steel wire, and immersing the prestressed steel wire into a corrosive solution;
and/or connecting the positive pole of the power supply with the prestressed steel wire, connecting the negative pole of the power supply with the conductor, and immersing the prestressed steel wire into a corrosive solution.
6. The PCCP pipe corrosion cracking process accelerated simulation test method of claim 5, wherein when the positive pole of the power supply is connected to the conductor, the negative pole of the power supply is connected to the prestressed steel wire, and the prestressed steel wire is immersed in the corrosive solution, the method further comprises:
and supplementing hydrogen-containing gas into the corrosive solution.
7. The PCCP pipe corrosion cracking process accelerated simulation test method of claim 5, wherein when the positive pole of the power source is connected to the prestressed steel wire and the negative pole of the power source is connected to the conductor, further comprising:
and supplementing oxygen-containing gas into the etching solution.
8. The PCCP pipe corrosion cracking process accelerated simulation experiment method of claim 5, further comprising:
filling water into the PCCP pipe;
blocking both ends of the PCCP tube.
9. The PCCP pipe corrosion cracking process accelerated simulation experiment method of claim 5, further comprising:
and covering soil bodies on the periphery of the PCCP pipe.
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