A reliability testing method for ultraviolet light in-situ curing pipeline repair material

Abstract

The present invention discloses a reliability test method for an ultraviolet light in-situ cured pipeline repair material, comprising the following steps: a first step, preparing a CIPP sample; a second step, preparing an aging solution; a third step, an accelerated aging test; and a fourth step, a tensile test. The reliability test cycle of the prior art is as long as 2 years, which is difficult to meet the needs of rapid iteration of CIPP products today; the test method provided by the present invention can verify the reliability of CIPP products through accelerated aging experiments in about 4 months, which is conducive to rapid iteration of products.

Description

Technical Field

[0001] The invention relates to the technical field of pipe detection, and in particular to a reliability testing method for an ultraviolet light in-situ curing pipeline repair material. Background Art

[0002] With the continuous development of my country's urbanization process, the scale of my country's underground pipeline network is increasing. However, with the increase in the service life of pipelines, the deterioration of ground overload and pipeline environment, as well as the serious problems of pipeline blockage, corrosion, leakage, aging, and misalignment, the research on underground pipeline repair technology has attracted much attention. In-situ curing (CIPP) repair technology is a method of trenchless pipeline repair by placing a resin-impregnated glass fiber composite hose inside the pre-repaired pipeline by flipping or pulling, and forming an inner lining through ultraviolet light or heat curing, among which ultraviolet light in-situ curing repair technology is the most commonly used.

[0003] However, the development of the domestic UV-CIPP pipe market is relatively lagging. In addition to the problem of dependence on imported raw materials, the pipe testing and certification standards are also uneven. Among them, the long-term reliability test of UV-CIPP pipe repair materials (UV-CIPP materials) is of great significance to the long-term use stability of water supply and drainage repair pipes. Therefore, it is urgent to establish a unified and complete testing standard.

[0004] However, on the one hand, there are no standardized UV-CIPP material reliability test standards and methods in China; on the other hand, the established test methods abroad have problems such as long test cycles, large site areas, and high test costs. These problems have led to the dilemma of domestic manufacturers having no standards to follow and no methods to test when producing UV-CIPP materials. Summary of the invention

[0005] In order to solve the defects of the prior art, the present invention provides a reliability testing method of an ultraviolet light in-situ curing pipeline repair material, comprising the following steps:

[0006] The first step is to prepare CIPP samples: Considering the bending stress of CIPP cured pipes, the influence of this factor needs to be considered during the test; therefore, CIPP samples are prepared by cutting CIPP cured pipes;

[0007] The second step is to prepare an aging solution: the formula of the aging solution refers to the urban sewage index; specifically, the aging solution contains phosphate, ammonium salt, peptone, sugar, and edible oil;

[0008] The third step is accelerated aging experiment: CIPP samples are placed in aging solution and aged at high temperature;

[0009] Step 4: Tensile test: Take the CIPP samples in the high temperature aging process and put them into the tensile testing machine for tensile test.

[0010] Preferably, in the first step: considering the influence of the pipe supporting materials such as glass fiber inside the CIPP solidified molded pipe on the bending strength and tensile strength of the pipe, when cutting the CIPP solidified molded pipe, the cutting is performed along the direction of fiber laying; and the cut CIPP sample is a curved square spline (i.e., an arc-shaped spline with a square cross-section).

[0011] Preferably, the diameter of the CIPP solidification molding pipe is 20-100 cm (more preferably 30-50 cm) and the thickness is 1-10 mm (more preferably 2-5 mm); the length of the CIPP sample is 25-50 cm and the width is 2-3 cm.

[0012] Preferably, in the second step: when preparing the aging solution, add 5-15 mg of phosphate, 80-100 mg of ammonium salt, 250-350 mg of peptone, 450-550 mg of sugar, and 5-15 mg of edible oil to every 10 L of water.

[0013] Preferably, the phosphate is selected from one or more of ammonium phosphate, sodium phosphate, potassium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate, and sodium dihydrogen phosphate;

[0014] The ammonium salt is selected from one or more of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium chloride, ammonium carbonate, ammonium sulfate, and ammonium acetate;

[0015] The peptone is selected from one or more of tryptic peptone, meat peptone, bone peptone, soy peptone and yeast peptone;

[0016] The sugar is selected from one or more of sucrose, xylose, fructose, glucose, lactose, galactose and maltose;

[0017] The edible oil is selected from one or more of rapeseed oil, peanut oil, hemp oil, corn oil, olive oil, camellia oil, palm oil, sunflower oil, soybean oil, sesame oil, linseed oil (sesame oil), grape seed oil, walnut oil, and peony seed oil.

[0018] Preferably, in the third step: the CIPP sample prepared in the first step is placed in a sealed box, and then the aging solution prepared in the second step is added into the sealed box, and the aging solution is made to submerge the CIPP sample; and then the sealed box containing the CIPP sample and the aging solution is placed in a high-temperature aging box for high-temperature aging.

[0019] Preferably, the sealing box is a rectangular stainless steel sealing box with good airtightness, and the size of the sealing box should be able to loosely place no less than 100 CIPP samples prepared in the first step.

[0020] Preferably, the high temperature aging time is 16 to 24 weeks; the high temperature aging is performed at three different temperature groups, and the three temperature groups are respectively 30 to 95°C.

[0021] Preferably, in the fourth step: the sampling and testing cycle of the CIPP samples during the high temperature aging process is once every 1 to 4 weeks.

[0022] Preferably, the tensile testing machine has a hydraulic clamp, a tensile load of not less than 100 kN and a tensile stroke of not less than 500 mm; and during the tensile test, the effective clamping length of the hydraulic clamp on one side of the CIPP sample is not less than 100 mm, and the tensile speed is 1 to 20 mm / min.

[0023] The advantages and beneficial effects of the present invention are: providing a reliability testing method for ultraviolet light in-situ curing pipeline repair materials, which can accelerate the implementation of aging experiments, can verify the reliability of CIPP products, and facilitate rapid product iteration.

[0024] The reliability test cycle of the existing technology is as long as 2 years, which is difficult to adapt to the current needs of rapid iteration of CIPP products; the testing method provided by the present invention can verify the reliability of CIPP products through accelerated aging experiments in about 4 months, which is conducive to rapid iteration of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of Example 1. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0027] The technical solutions specifically implemented in the present invention are as follows:

[0028] Example 1

[0029] This embodiment provides a CIPP sample (UV-cured in-situ pipeline repair material sample), which is prepared by the following steps:

[0030] like Figure 1As shown, a CIPP solidification molding pipe is prepared according to the engineering implementation standard scheme, and the diameter of the pipe is 50 cm and the thickness is 3 mm; the pipe is fixed with a special clamp, and a curved square spline (i.e., an arc-shaped spline with a square cross-section) with a length of 300 mm, a width of 30 mm, and a thickness of 3 mm is cut from the CIPP solidification molding pipe along the laying direction of the glass fiber (generally along the circumferential direction), thereby obtaining a CIPP sample;

[0031] The CIPP sample prepared in Example 1 is used for later use.

[0032] Example 2

[0033] This example provides another CIPP sample (UV-cured in-situ pipeline repair material sample), which is prepared by the following steps:

[0034] A CIPP solidification molded pipe was prepared according to the standard engineering implementation scheme, and the pipe had a diameter of 70 cm and a thickness of 3 mm. The pipe was fixed with a special fixture, and a curved square spline (i.e., an arc-shaped spline with a square cross-section) with a length of 500 mm, a width of 30 mm, and a thickness of 3 mm was cut from the CIPP solidification molded pipe along the laying direction of the glass fiber (generally along the circumferential direction), thereby obtaining a CIPP sample.

[0035] The CIPP sample prepared in Example 2 is used as a standby.

[0036] Example 3

[0037] This embodiment provides an aging solution. When preparing the aging solution, the following components are added to every 10L of water:

[0038] Element Triammonium phosphate Ammonium chloride Soybean Peptone sucrose Soybean Oil Addition amount 10mg 89mg 285mg 479mg 8.8mg

[0039] The aged solution prepared in Example 3 is used for later use.

[0040] Example 4

[0041] This embodiment provides another aging solution. When preparing the aging solution, the following components are added to every 10L of water:

[0042] Element Triammonium phosphate Ammonium carbonate Soybean Peptone sucrose Rapeseed Oil Addition amount 14mg 100mg 285mg 479mg 11mg

[0043] The aged solution prepared in Example 4 is ready for use.

[0044] Example 5

[0045] This embodiment provides a solution for an aging experiment, including the following steps:

[0046] Prepare three rectangular stainless steel sealed boxes with a length of 60 cm, a width of 35 cm, and a height of 10 cm, and evenly place 55 CIPP samples (curved square specimens with a length of 300 mm, a width of 30 mm, and a thickness of 3 mm) prepared in Example 1 in a sealed box, and then add the aging solution prepared in Example 3 to the storage box to submerge the CIPP samples, and finally seal it with a sealing cover;

[0047] Preheat three thermostatic aging boxes of appropriate sizes to 30℃, 50℃ and 80℃ respectively. After the temperature reaches the set temperature, quickly place the three prepared sealed boxes in them, and perform sampling and tensile test according to the set sampling plan;

[0048] The sampling scheme is shown in the following table:

[0049]

[0050] In the above table, A-1 to A-10 represent the tensile values ​​measured at the corresponding aging time at 30°C, B-1 to B-10 represent the tensile values ​​measured at the corresponding aging time at 50°C, and C-1 to C-10 represent the tensile values ​​measured at the corresponding aging time at 80°C.

[0051] Example 6

[0052] This embodiment provides another aging experiment scheme, including the following steps:

[0053] Prepare three rectangular stainless steel sealed boxes with a length of 60 cm, a width of 55 cm, and a height of 10 cm, and evenly place 50 CIPP samples (curved square specimens with a length of 500 mm, a width of 30 mm, and a thickness of 3 mm) prepared in Example 2 in a sealed box. After placing them, add the aging solution prepared in Example 4 to the storage box to submerge the CIPP samples, and finally seal them with a sealing cover;

[0054] Preheat three thermostatic aging boxes of appropriate sizes to 35°C, 55°C and 80°C respectively. After the temperature reaches the set temperature, quickly place the three prepared sealed boxes in them, and perform sampling and tensile test according to the set sampling plan;

[0055] The sampling scheme is shown in the following table:

[0056]

[0057] In the above table, D-1 to D-10 represent the tensile force values ​​measured at the corresponding aging time at 35°C, E-1 to E-10 represent the tensile force values ​​measured at the corresponding aging time at 55°C, and F-1 to F-10 represent the tensile force values ​​measured at the corresponding aging time at 80°C.

[0058] Example 7

[0059] This embodiment provides a scheme for a tensile test, comprising the following steps:

[0060] A tensile testing machine with a hydraulic clamp was used to perform a tensile test on the CIPP samples taken out during the high temperature accelerated aging process. During the tensile test, the effective clamping length of the clamp on one side of the CIPP sample was not less than 100 mm, and the tensile speed was 10 mm / min.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A reliability testing method for UV-curable pipeline repair materials, characterized in that: The steps include: The first step is to prepare the CIPP sample: the CIPP sample is prepared by cutting the CIPP solidified molded pipe; The second step is to prepare an aging solution: the aging solution contains phosphate, ammonium salt, peptone, sugar, and edible oil; The third step is accelerated aging experiment: CIPP samples are placed in aging solution and aged at high temperature; Step 4: Tensile test: Take the CIPP samples in the high temperature aging process and put them into the tensile testing machine for tensile test.

2. The reliability testing method of the UV-curable in-situ pipeline repair material according to claim 1 is characterized in that: In the first step: when cutting the CIPP solidified molded pipe, the cutting is performed along the fiber laying direction; and the cut CIPP sample is a curved square spline.

3. The reliability testing method of the UV-in-situ cured pipeline repair material according to claim 1 or 2, characterized in that: The diameter of the CIPP solidification molding pipe is 20-100 cm and the thickness is 1-10 mm; the length of the CIPP sample is 25-50 cm and the width is 2-3 cm.

4. The reliability testing method of the UV-in-situ cured pipeline repair material according to claim 1, characterized in that: In the second step: when preparing the aging solution, add 5-15 mg of phosphate, 80-100 mg of ammonium salt, 250-350 mg of peptone, 450-550 mg of sugar, and 5-15 mg of edible oil to every 10 L of water.

5. The reliability testing method of the UV-in-situ cured pipeline repair material according to claim 1 or 4, characterized in that: The phosphate is selected from one or more of ammonium phosphate, sodium phosphate, potassium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate, and sodium dihydrogen phosphate; The ammonium salt is selected from one or more of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium chloride, ammonium carbonate, ammonium sulfate, and ammonium acetate; The peptone is selected from one or more of tryptic peptone, meat peptone, bone peptone, soy peptone and yeast peptone; The sugar is selected from one or more of sucrose, xylose, fructose, glucose, lactose, galactose and maltose; The edible oil is selected from one or more of rapeseed oil, peanut oil, hemp oil, corn oil, olive oil, camellia oil, palm oil, sunflower oil, soybean oil, sesame oil, linseed oil (sesame oil), grape seed oil, walnut oil, and peony seed oil.

6. The reliability testing method of the UV-curable in-situ pipeline repair material according to claim 1 is characterized in that: In the third step: the CIPP sample prepared in the first step is placed in a sealed box, and then the aging solution prepared in the second step is added into the sealed box, and the aging solution is made to submerge the CIPP sample; and then the sealed box containing the CIPP sample and the aging solution is placed in a high-temperature aging box for high-temperature aging.

7. The reliability testing method of the UV-curable in-situ pipeline repair material according to claim 6 is characterized in that: The sealing box is a rectangular stainless steel sealing box.

8. The reliability testing method of the UV-curable in-situ pipeline repair material according to claim 6, characterized in that: The high temperature aging process is carried out for 16 to 24 weeks at three different temperature groups, and the three temperature groups are respectively 30 to 95°C.

9. The reliability testing method of the UV-curable in-situ pipeline repair material according to claim 1, characterized in that: In the fourth step: the sampling and testing cycle of the CIPP samples during the high temperature aging process is once every 1 to 4 weeks.

10. The reliability testing method of the UV-in-situ cured pipeline repair material according to claim 1 or 9, characterized in that: The tensile testing machine has a hydraulic clamp, a tensile load of not less than 100 kN and a tensile stroke of not less than 500 mm; and during the tensile test, the effective clamping length of the hydraulic clamp on one side of the CIPP sample is not less than 100 mm, and the tensile speed is 1 to 20 mm / min.

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