A remedial construction method for a CIPP soft tube inner membrane after breakage

Abstract

A CIPP soft tube inner membrane damage remediation construction method, comprising the following steps: S1: pulling back the CIPP soft tube inner part to the CIPP soft tube end; S2: releasing the CIPP soft tube internal pressure, and drawing out all the parts from the CIPP soft tube; S3: selecting a replacement inner membrane; S4: tightening the rear end of the replacement inner membrane, and folding and turning; S5: putting the replacement inner membrane into the CIPP soft tube from the port, and connecting the replacement inner membrane with a pressing device; S6: pressing by the external pressing device, and continuously blowing and turning the replacement inner membrane until the rear end of the replacement inner membrane is turned out from the other end of the CIPP soft tube; S7: cutting the knot of the rear end of the replacement inner membrane; S8: according to the existing traditional construction steps, carrying out the subsequent steps of lamp pulling in, end cap installation, pressing and the like; S9: after completing the CIPP soft tube laying and irradiation curing, disassembling and pulling out the replacement inner membrane to complete the whole pipeline repair process.

Description

Technical Field

[0001] The invention belongs to the field of pipeline construction and maintenance, relates to a construction method, in particular to a construction method in CIPP pipeline repair construction, and specifically to a remedial construction method after the inner membrane of a CIPP hose is damaged. Background Art

[0002] CIPP (In-Situ Solidification in Place) is a common method for trenchless underground pipeline maintenance and repair, and it's also one of the fastest and most effective. Originating in the UK in the 1970s, CIPP remains the most widely used trenchless repair technology for underground pipelines worldwide. CIPP technology is widely used, particularly for the trenchless repair of gravity flow pipelines, water supply pipelines, gas pipelines, and other pressure pipelines.

[0003] At present, the application of CIPP hose for trenchless pipeline repair technology is gradually becoming more popular in China, but there are still difficult to overcome technical problems in the current construction methods that need further research and overcoming. In the current CIPP pipeline repair technology, after the CIPP hose is laid, it is necessary to pull the ultraviolet lamp, head and other components inside to install. Especially during the installation of the lamp, there is a certain probability of scratching and damaging the inner membrane of the CIPP hose, or the laid CIPP hose itself has inner membrane damage due to loopholes in the quality inspection link. The above problems are generally discovered during the construction process. For example, during the CIPP hose pressurization process, it is found that the CIPP hose cannot maintain pressure inside, or there is air leakage between the external UV-resistant film and the inner membrane of the CIPP hose during the pressurization process. It can be determined that the inner membrane is damaged. Once the inner membrane is damaged, according to the existing construction process, the CIPP hose will be pulled out and replaced to remedy the situation. Based on actual construction experience, if a CIPP hose's inner membrane is damaged during the pressure test, the entire hose must be replaced. This is a complex and time-consuming task, requiring significant labor and time to resolve. Furthermore, the hose must be re-laid, making the entire process time-consuming and labor-intensive. Traditional methods and technologies have explored targeted repairs, but due to the large amount of resin material filled between the outer and inner membranes and the intermediate material laid, the heavy weight of the CIPP hose makes it difficult to access with human or specialized tools. Therefore, remediating inner membrane damage is an urgent technical issue that needs to be addressed in current construction technology. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a remedial construction method for a CIPP hose after the inner membrane is damaged during construction, which has low construction difficulty, requires less manpower, is short in time, and has low cost.

[0005] The method of the present invention is:

[0006] A remedial construction method for a CIPP hose after the inner membrane is damaged, after determining that the inner membrane is damaged, the construction method comprises the following steps:

[0007] S1: When the CIPP hose is under pressure, the UV lamp, cables and other components that have been installed and put into the CIPP hose but have not yet been used for irradiation are pulled back to the end of the CIPP hose through the traction rope;

[0008] S2: Completely release the internal pressure of the CIPP hose, disassemble the ends of the hose, and pull out all the components inside the CIPP hose, including the ultraviolet light, from the ends of the CIPP hose to restore the CIPP hose to its unpressurized state.

[0009] S3: Based on the specifications of the CIPP hose used in the construction, select an inner membrane with the same specifications as the CIPP hose during production as the replacement inner membrane. The length of the replacement inner membrane should be greater than the overall length of the CIPP hose.

[0010] S4: tying the rear end of the replacement inner membrane, folding the replacement inner membrane in a rotational manner, and turning the front end of the replacement inner membrane outward when the rotational folding is completed, and inserting the folded portion of the replacement inner membrane into the front end of the replacement inner membrane when the front end of the replacement inner membrane is turned outward;

[0011] S5: Place the folded replacement inner membrane into the port at one end of the CIPP hose, secure one end of the light cord to the rear end of the replacement inner membrane, and then seal the front end of the replacement inner membrane with the external pressing device.

[0012] S6: The external pressing device presses the inside of the replacement inner membrane. As the pressing continues, the replacement inner membrane is continuously blown and turned over until the rear end of the replacement inner membrane is turned out from the other end of the CIPP hose, completing the laying of the replacement inner membrane.

[0013] S7: Dismantle and remove the external pressure device, cut open the tie at the rear end of the replacement inner membrane, and ensure that the front and rear ends of the replacement inner membrane are slightly longer than the CIPP hose;

[0014] S8: According to the existing traditional construction steps, the subsequent steps such as lighting fixture pulling, head installation, and pressure testing are carried out. During the pressure testing process, the internal pressure is continuously tested to see if it meets the standard, so as to determine whether the inner membrane damage problem has been repaired;

[0015] S9: After the CIPP hose is laid and irradiated for curing, the replacement inner membrane is disassembled and pulled out to complete the entire pipeline repair process.

[0016] The pressure state in S1 refers to a non-continuous pressing state, a pressure maintaining state after stopping pressing, or a slow pressure releasing state caused by the damage of the inner membrane. The pressure state pulls the device component, which can avoid the excessive friction between the device component such as a purple light and a cable and the inner membrane during pulling, thereby causing greater wear and damage, especially avoiding the more serious irreparable damage caused by the connection between the damaged part and the device component. The device component is pulled to the end position of the CIPP hose in the pressure state, and then is pulled out after pressure relief, which greatly ensures that the inner membrane is not damaged again.

[0017] In S3, the selected length of the replacement inner membrane is greater than the total length of the CIPP hose, and the front and rear of the replacement inner membrane are longer than the end of the CIPP hose by not less than 10 cm after being sleeved.

[0018] In S4, the folding method is determined according to the construction length of the CIPP hose and the diameter of the inner membrane, and the length and number of the folding are determined according to the different construction lengths of the CIPP hose and the diameters of the inner membrane, so that the folded part can be inserted into the turning part, thereby ensuring that the replacement inner membrane can be smoothly turned and advanced under the action of pressure during the pressing process, and is smoothly turned out from the other end of the CIPP hose.

[0019] In S5, one end of the lamp cord is fixed to the rear end of the replacement inner membrane, and the lamp cord advances together during the process of the replacement inner membrane being pressed and turned forward, thereby completing the preset of the lamp cord.

[0020] In S3, the replacement inner membrane can be selected as the same specification parameters as the original inner membrane, but is made of other inflatable and pressurizable material films of different materials.

[0021] The beneficial effects of the method of the application are: firstly, from the overall construction method and construction technology, the method changes the traditional idea of replacing the entire CIPP hose after the inner membrane is damaged, and provides a remedial construction method of adding a replacement inner membrane at the construction site. The method avoids the pulling out and scrapping of the CIPP hose as a whole, thereby greatly reducing the cost investment. In addition, the construction method of adding a replacement inner membrane is simple and convenient, and basically does not need to use large tools, so it can meet the construction requirements of the narrow construction space in trenchless construction. Compared with replacing the entire CIPP hose, the method uses simple materials, is fast and convenient, requires less labor, and has fast problem remediation time, and the like.

[0022] In terms of the partial steps of the entire inventive method: 1. In step S1, after the inner membrane is found and determined to be damaged during the pressurization process, the pressure is not completely released. Instead, the installed ultraviolet lamp, wires and cables, probes and other components are pulled to the end of the CIPP hose during the process of maintaining pressure or slowly releasing pressure. This is because the contact area between the components and the inner membrane is smaller in the pressurized state than in the completely depressurized state, and the weight of the CIPP hose borne on the components is also smaller. Therefore, the friction between the entire CIPP hose and the components is also smaller, which can effectively prevent the components from causing secondary damage to the inner membrane, or causing the damaged part of the inner membrane to be more damaged due to hooking with the components.

[0023] 2. In step S3, the length of the replacement inner membrane is selected to be longer than the length of the CIPP hose to ensure that the replacement inner membrane can be turned out from the other end of the CIPP hose and leave enough trimming space. Because one end of the replacement inner membrane is tied during the pressing and turning process, it needs to be cut and trimmed evenly after turning out.

[0024] 3. In step S5, one end of the light cord is fixed to the rear end of the replacement inner membrane. As the replacement inner membrane is pressed and flipped forward, the light cord advances with it, completing the pre-setting of the light cord. Because the light cord is laid along with the CIPP hose during installation, the previously pre-set light cord has been pulled out before the replacement inner membrane is laid, so a new light cord is required to facilitate the subsequent pulling in and setting of components such as the ultraviolet lamp. The new light cord is fixed to the rear end of the replacement inner membrane and flips out from the other end of the CIPP hose as the replacement inner membrane flips, thus completing the laying of the new light cord, making the entire process efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of bundling the rear end portion of the replacement endometrium in the present invention.

[0026] Figure 2 This is a schematic diagram of the folding path and flipping of the alternative inner membrane in the present invention (the actual thickness of the alternative inner membrane is relatively small, but it is displayed with a larger thickness in the figure to facilitate the display of the folding and flipping package path.).

[0027] Figure 3 It is a schematic diagram of the replacement inner membrane flip suit in the present invention, and a schematic diagram of the connection of the light cord.

[0028] In the picture: 1. Replacement inner membrane 2. Light cord.

[0029] In the figure: there are arrows to mark the folding direction for easy understanding. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below with reference to the embodiments.

[0031] Example 1

[0032] The structure of the inner membrane and its folding path and inversion and folding path are shown in Figures 1-3.

[0033] The first step is to analyze and determine whether the problem is a damaged inner membrane. The general process of CIPP hose pipeline repair technology is: laying the CIPP hose inside the pipeline to be repaired - installing ultraviolet lamps and other components inside the CIPP hose - installing heads at both ends - applying pressure through the air inlet of the head until the internal pressure value of the CIPP hose meets the standard so that the CIPP hose is in close contact with the inner wall of the pipeline to be repaired - the ultraviolet lamp works and runs inside the CIPP hose until the photosensitive resin material in the CIPP hose is solidified to form a replacement pipeline inside the pipeline to be repaired - depressurize and disassemble the head, and pull out the ultraviolet lamp and other components - trim the protruding part of the CIPP pipeline and grind off the burrs to complete the pipeline repair. During the construction process, damage to the inner membrane is generally discovered during the process of "applying pressure through the air inlet of the head until the internal pressure value of the CIPP hose meets the standard so that the CIPP hose is in close contact with the inner wall of the pipeline to be repaired." If the inner membrane is damaged, the internal pressure of the CIPP hose will not be able to reach the required level. Furthermore, during the process, there will be a sound of air leaking between the outer and inner membranes of the CIPP hose at the end capping point. Once these problems occur, it is generally considered that the inner membrane is damaged. Once the problem is confirmed, the invented method can be used to remedy the situation.

[0034] A remedial construction method for a CIPP hose after the inner membrane is damaged, after determining that the inner membrane is damaged, the construction method comprises the following steps:

[0035] S1: While the CIPP hose is pressurized, the UV lamp, cables, and other components that have been installed and inserted into the hose but not yet in use are pulled back to the end of the hose using a pull rope. This pressure pull reduces friction between the components and the hose's inner membrane compared to fully depressurized conditions, effectively preventing secondary damage to the membrane caused by long-distance pulling.

[0036] S2: Completely release the internal pressure of the CIPP hose, remove the end caps, and remove all internal components, including the UV lamp, from the ends of the CIPP hose, allowing the hose to return to its unpressurized, deflated state. Because the UV lamp was not operating when the inner membrane was damaged, the photosensitive resin material within the CIPP hose had not yet cured, allowing the hose to return to its deflated, unpressurized state.

[0037] S3: Based on the specifications of the CIPP hose being used, select a replacement inner membrane with the same specifications as the CIPP hose during production. The length of the replacement inner membrane should be greater than the overall length of the CIPP hose. The longer replacement inner membrane ensures that the replacement inner membrane is sufficient for use and leaves ample room for trimming.

[0038] S4: Tie the rear end of the replacement inner membrane tightly and fold it in a rotational manner. When the rotational folding is completed, turn the front end of the replacement inner membrane outward. When the front end of the replacement inner membrane is turned outward, insert the folded portion. This folding and turning method is relatively mature in current pipeline turning maintenance methods and is also relatively convenient and quick.

[0039] S5: Insert the folded replacement inner membrane through the port at one end of the CIPP hose and secure one end of the light cord to the rear end of the replacement inner membrane. Then, seal and connect the front end of the replacement inner membrane to the external pressure device. The original light cord was already laid during the CIPP hose installation and was removed before the replacement inner membrane was laid. Therefore, a new one must be laid during the replacement inner membrane installation. Secure one end of the light cord to the tied end of the replacement inner membrane so that it can be moved forward with the replacement inner membrane during the pressure installation to complete the installation.

[0040] S6: The external pressing device presses the inside of the replacement inner membrane. As the pressing continues, the replacement inner membrane is continuously blown and turned over until the rear end of the replacement inner membrane is turned out from the other end of the CIPP hose, completing the laying of the replacement inner membrane.

[0041] S7: The external pressure device is dismantled and removed. The replacement inner membrane is now in a deflated state. The tie at the rear end of the replacement inner membrane is cut open, and both the front and rear ends of the replacement inner membrane are slightly longer than the CIPP hose by 10 cm.

[0042] S8: After completing the above steps, proceed according to the existing process: install ultraviolet lamps and other components inside the CIPP hose - install end caps at both ends - apply pressure through the air inlet hole of the end cap until the internal pressure value of the CIPP hose reaches the standard so that the CIPP hose is in close contact with the inner wall of the pipe to be repaired - operate the ultraviolet lamp and perform running irradiation inside the CIPP hose until the photosensitive resin material in the CIPP hose is solidified to form a replacement pipe inside the pipe to be repaired - relieve pressure, disassemble the end cap, and pull out the ultraviolet lamp and other components.

[0043] S9: After the CIPP hose is irradiated and cured, a new replacement pipeline is formed, but the replacement inner membrane does not adhere to the original CIPP hose inner membrane, but simply serves as a new inner membrane to ensure that the CIPP hose does not depressurize during pressure testing, thus ensuring that the CIPP hose can be tightly attached to the pipeline to be repaired after pressure testing. After the pressure test is completed and the replacement inner membrane is irradiated and cured, the replacement inner membrane needs to be removed, and the replacement inner membrane can be recycled according to actual conditions.

[0044] The above construction steps solve the problem that after the CIPP hose inner membrane is damaged, the CIPP hose cannot be pressure tested to adhere to the inner wall of the pipeline to be repaired for irradiation and curing by a violet light. Moreover, the remedial method solves the problem of inner membrane damage, which is basically a major breakthrough in the field. A new remedial method is sought, the cost input is greatly reduced, the labor input is minimized compared to other treatment methods, the construction difficulty is relatively small, and the construction period is greatly shortened. Overall, the remedial method is a major technical breakthrough in the CIPP hose maintenance field, which not only minimizes material costs and labor costs, but also greatly reduces the construction period.

Claims

1. A remedial construction method for a damaged CIPP hose inner membrane, characterized by: After determining that the inner membrane is damaged, the construction method includes the following steps: S1: When the CIPP hose is under pressure, the UV lamp, cables and other components that have been installed and put into the CIPP hose but have not yet been used for irradiation are pulled back to the end of the CIPP hose through the traction rope; S2: Completely release the internal pressure of the CIPP hose, disassemble the ends of the hose, and pull out all the components inside the CIPP hose, including the ultraviolet light, from the ends of the CIPP hose, so that the CIPP hose returns to its unpressurized state. S3: Based on the specifications of the CIPP hose used in the construction, select an inner membrane with the same specifications as the CIPP hose during production as the replacement inner membrane. The length of the replacement inner membrane should be greater than the overall length of the CIPP hose. S4: tying the rear end of the replacement inner membrane, folding the replacement inner membrane in a rotational manner, and turning the front end of the replacement inner membrane outward when the rotational folding is completed, and inserting the folded portion of the replacement inner membrane into the front end of the replacement inner membrane when the front end of the replacement inner membrane is turned outward; S5: Place the folded replacement inner membrane into the port at one end of the CIPP hose, secure one end of the light cord to the rear end of the replacement inner membrane, and then seal the front end of the replacement inner membrane with the external pressing device. S6: The external pressing device presses the inside of the replacement inner membrane. As the pressing continues, the replacement inner membrane is continuously blown and turned over until the rear end of the replacement inner membrane is turned out from the other end of the CIPP hose, completing the laying of the replacement inner membrane. S7: Dismantle and remove the external pressure device, cut open the tie at the rear end of the replacement inner membrane, and ensure that the front and rear ends of the replacement inner membrane are slightly longer than the CIPP hose; S8: According to the existing traditional construction steps, the subsequent steps of pulling in the lamps, installing the head, pressing, and irradiation curing are carried out. During the pressing process, the internal pressure is continuously checked to see if it meets the standard to determine whether the inner membrane damage problem has been repaired. If the pressure does not meet the standard, the replacement inner membrane needs to be replaced and the above steps are repeated to lay the new replacement inner membrane. If the pressure meets the standard, it means that the inner membrane damage problem has been repaired. S9: After the CIPP hose is laid and irradiated for curing, the replacement inner membrane is disassembled and pulled out to complete the entire pipeline repair process.

2. The method for repairing a damaged CIPP hose inner membrane according to claim 1, wherein: The pressurized state described in S1 refers to: not a continuous pressurization state, but a pressure-maintaining state after stopping pressurization, or a slowly releasing pressure state.

3. The method for repairing a damaged CIPP hose inner membrane according to claim 1, wherein: The length of the replacement inner membrane in S3 should be greater than the overall length of the CIPP hose. After the replacement inner membrane is inserted, its front and back are both at least 10 cm longer than the end of the CIPP hose.

4. The method for repairing a damaged CIPP hose inner membrane according to claim 1, wherein: In S4, the folding method determines the length of the rotational fold and the number of rotational folds according to the construction length of the CIPP hose and the inner membrane diameter of the CIPP hose.

5. The method for repairing a damaged CIPP hose inner membrane according to claim 1, wherein: In S5, one end of the light rope is fixed to the rear end of the replacement inner membrane. When the replacement inner membrane is pressed and flipped forward, the light rope moves forward together, completing the preset of the light rope.

6. The method for repairing a damaged CIPP hose inner membrane according to claim 1, wherein: The replacement inner membrane in S3 is selected to be another inflatable and compressible material membrane with the same specifications and parameters as the original inner membrane but of a different material.

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