A UV curing pipeline repair method

Abstract

The present invention discloses a UV-curing pipeline repair method, which belongs to the field of pipeline repair, S1, respectively designing the thickness of the inner liner for non-structural defects and structural defects; S2, blocking; S3, isolating and precipitation; S4, desilting, flushing and CCTV detection: using high-pressure flushing equipment to flush the pipeline to be repaired; S5, after pulling in the bottom film, determine the defect type of the pipeline to be repaired, and pull the inner liner of the corresponding defect type into the pipeline to be repaired; S6, after the head is tied, use the high-pressure inflation device to inflate the inner liner, so that the inner liner fits the inner wall of the pipeline to be repaired; S7, pull the UV curing lamp into the pipeline to be repaired for irradiation and curing; S8, remove the head, and perform port processing. The present invention adopts the above-mentioned UV-curing pipeline repair method to determine the thickness of the inner liner for different defect types, which provides a basis for determining the thickness of the inner liner, can avoid the rupture of the inner liner due to unreasonable design, and improve the repair quality.

Description

Technical Field

[0001] The invention relates to the field of pipeline repair, and in particular to an ultraviolet curing pipeline repair method. Background Art

[0002] With the acceleration of urban modernization, drainage pipe networks, as important municipal facilities, play an important role as the "blood vessels" of cities. However, at the beginning of urban construction, the pipe network was not systematically planned, and there were problems such as broken pipes and mixed rainwater and sewage. As time went by, some pipes began to have structural defects such as pipe aging, rupture, leakage, and deformation, as well as functional defects such as tree roots and siltation, causing urban waterlogging, river pollution, and other problems, affecting people's lives. Therefore, the work of repairing and renovating the municipal drainage pipe network is imminent.

[0003] The traditional repair technology only involves excavation and pipe replacement, which has problems such as long construction period and great impact on the environment.

[0004] In order to solve the above problems, the existing technology has further developed CIPP ultraviolet light curing repair technology, which prefabricates the fiberglass hose in the factory according to the actual situation on site and completely impregnates it with light-curing resin, curing agent and other materials. During on-site construction, it is pulled into the pipeline to be repaired, and the air compressor is used to inflate and expand the fiberglass hose to make it close to the pipeline to be repaired. The pipeline to be repaired is used as the outer mold and the inner membrane of the hose is used as the inner lining. Then, under the irradiation of ultraviolet light in a special band, the resin is cured to form a composite lining pipe with a certain strength, which is close to the original pipe to complete the repair.

[0005] However, in the existing construction process, since the thickness of the liner pipe is mainly determined by the experience of the staff, there is a large manual error, which may lead to the risk of rupture of the liner pipe in severe cases. Summary of the invention

[0006] To solve the above problems, the present invention provides a UV-curing pipeline repair method, which determines the thickness of the liner pipe according to different defect types, provides a basis for determining the thickness of the liner pipe, avoids the rupture of the liner pipe due to unreasonable design, and improves the repair quality.

[0007] To achieve the above object, the present invention provides a UV curing pipeline repair method, comprising the following steps:

[0008] S1. The pipeline to be repaired is divided into non-structural defects and structural defects, and the thickness of the liner pipe is designed for non-structural defects and structural defects respectively;

[0009] S2. Blocking: Use inflatable airbags to block water in the upstream and downstream of the pipeline to be repaired, and install retaining walls to support the inflatable airbags;

[0010] S3, Isolation and dewatering: Use a hose to connect the upstream inspection well and the downstream inspection well of the pipeline to be repaired, and use a water pump to pump the water in the upstream inspection well of the pipeline to be repaired to the downstream inspection well, and at the same time pump the accumulated water in the pipeline to be repaired to the downstream inspection well;

[0011] S4, dredging, flushing and CCTV inspection: Use high-pressure flushing equipment to flush the pipeline to be repaired;

[0012] S5. After the bottom film is pulled in, the defect type of the pipeline to be repaired is determined, and an inner liner pipe corresponding to the defect type is pulled into the pipeline to be repaired;

[0013] S6. After the heads are tied, the inner liner is inflated with air using a high-pressure inflating device so that the inner liner fits the inner wall of the pipe to be repaired;

[0014] S7, pull the ultraviolet curing lamp into the pipe to be repaired for irradiation and curing;

[0015] S8. Remove the tying head and perform port processing.

[0016] Preferably, in step S1, when the defect type is a non-structural defect, the thickness calculation formula of the liner pipe is as follows:

[0017]

[0018] in,

[0019] or

[0020] Where: t ssr D is the thickness of the liner when the defect type is a non-structural defect, in mm; ssr0 is the outer diameter of the liner when the defect type is a non-structural defect, in mm; K is the circumferential support rate; E L is the long-term elastic modulus of the liner, in MPa; C is the ovality reduction factor; P is the groundwater pressure at the top of the liner, in MPa; N is the safety factor; μ is the Poisson's ratio; q is the ovality of the pipeline to be repaired; D E is the average inner diameter of the pipe to be repaired, in mm; D min D is the minimum inner diameter of the pipe to be repaired, in mm; max is the maximum inner diameter of the pipe to be repaired, in mm;

[0021] When the ellipticity of the inner liner is ≠0, the minimum thickness t of the inner liner is calculated. ssrmin Satisfies the following expression:

[0022]

[0023] Where: SDR is the standard size of the pipeline to be repaired; σ L is the long-term bending strength of the liner pipe, in MPa;

[0024] When the defect type is a structural defect, the thickness calculation formula of the liner pipe is as follows:

[0025]

[0026] in,

[0027]

[0028] Where: t sr D is the thickness of the liner when the defect type is a structural defect, in mm; srO is the outer diameter of the liner pipe when the defect type is a structural defect, in mm; q t is the total external pressure of the liner pipe, in MPa; R W is the water buoyancy coefficient; B' is the elastic support coefficient; E' S is the comprehensive deformation modulus of the soil outside the liner pipe, in MPa; H W is the height of the groundwater level above the top of the liner pipe, in m; γ is the soil density, in KN / m 3 ; H is the laying depth of the lining pipe; H S W is the soil thickness of the liner pipe top, in m; S is the live load, in MPa;

[0029] And the minimum thickness of the liner is t srmin t min Satisfies the following expression:

[0030]

[0031] Where: E is the initial elastic modulus of the liner pipe, in MPa.

[0032] Preferably, the value of K is 7.0; E L Take 50% of the short-term modulus; N is 2.0; μ is 0.3; q is 2%; σ L Take 50% of the short-term strength;

[0033] The total external pressure of the liner pipe includes groundwater pressure, overburden pressure and live load; R W Greater than 0.67.

[0034] Preferably, the SDR is no greater than 100 when the lined pipe is located above the groundwater table.

[0035] Preferably, in step S8, after the curing of the liner pipe is completed, the pressure in the pipeline is reduced at a set pressure reduction rate. After the pressure in the pipeline drops to the ambient pressure, the piercing head is removed, the ultraviolet curing lamp is taken out, and the reduced diameter portion of the liner pipe port is cut off, so that the liner pipe port is flush with the port of the pipe to be repaired.

[0036] Preferably, the pressure reduction rate is set to be no greater than 0.01 MPa / min.

[0037] The present invention has the following beneficial effects:

[0038] 1. By determining the thickness of the liner pipe according to different defect types, a basis is provided for determining the thickness of the liner pipe, which can avoid the rupture of the liner pipe due to unreasonable design and improve the repair quality.

[0039] 2. Use a hose to direct the water in the upstream inspection well to the downstream inspection well without affecting normal drainage needs.

[0040] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention is a flowchart of an ultraviolet curing pipeline repair method. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0043] It should be noted that the terms "include", "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or devices.

[0044] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] like Figure 1 As shown, a UV curing pipeline repair method comprises the following steps:

[0046] S1. The pipeline to be repaired is divided into non-structural defects and structural defects, and the thickness of the liner pipe is designed for non-structural defects and structural defects respectively;

[0047] In step S1, when the defect type is a non-structural defect, the thickness calculation formula of the liner pipe is as follows:

[0048]

[0049] in,

[0050] or

[0051] Where: t ssr D is the thickness of the liner when the defect type is a non-structural defect, in mm; ssr0 is the outer diameter of the liner when the defect type is a non-structural defect, in mm; K is the circumferential support rate; E L is the long-term elastic modulus of the liner, in MPa; C is the ovality reduction factor; P is the groundwater pressure at the top of the liner, in MPa; N is the safety factor; μ is the Poisson's ratio; q is the ovality of the pipeline to be repaired; D E is the average inner diameter of the pipe to be repaired, in mm; D min D is the minimum inner diameter of the pipe to be repaired, in mm; max is the maximum inner diameter of the pipe to be repaired, in mm;

[0052] When the ellipticity of the inner liner is ≠0, the minimum thickness t of the inner liner is calculated. ssrmin Satisfies the following expression:

[0053]

[0054] Where: SDR is the standard size of the pipeline to be repaired; σ L is the long-term bending strength of the liner pipe, in MPa;

[0055] When the defect type is a structural defect, the thickness calculation formula of the liner pipe is as follows:

[0056]

[0057] in,

[0058]

[0059] Where: tsr D is the thickness of the liner when the defect type is a structural defect, in mm; srO is the outer diameter of the liner pipe when the defect type is a structural defect, in mm; q t is the total external pressure of the liner pipe, in MPa; R W is the water buoyancy coefficient; B' is the elastic support coefficient; E' S is the comprehensive deformation modulus of the soil outside the liner pipe, in MPa; H W is the height of the groundwater level above the top of the liner pipe, in m; γ is the soil density, in KN / m 3 ; H is the laying depth of the lining pipe; H S W is the soil thickness of the liner pipe top, in m; S is the live load, in MPa;

[0060] And the minimum thickness of the liner is t srmin t min Satisfies the following expression:

[0061]

[0062] Where: E is the initial elastic modulus of the liner pipe, in MPa.

[0063] Preferably, the value of K is 7.0; E L Take 50% of the short-term modulus; N is 2.0; μ is 0.3; q is 2%; σ L Take 50% of the short-term strength;

[0064] The total external pressure of the liner pipe includes groundwater pressure, overburden pressure and live load; R W Greater than 0.67.

[0065] Preferably, the SDR is no greater than 100 when the lined pipe is located above the groundwater table.

[0066] S2. Blocking: Use inflatable airbags to block water in the upstream and downstream of the pipeline to be repaired, and install retaining walls to support the inflatable airbags;

[0067] Table 1 Parameters of inflatable airbag

[0068]

[0069] S3, Isolation and dewatering: Use a hose to connect the upstream inspection well and the downstream inspection well of the pipeline to be repaired, and use a water pump to pump the water in the upstream inspection well of the pipeline to be repaired to the downstream inspection well, and at the same time pump the accumulated water in the pipeline to be repaired to the downstream inspection well;

[0070] S4, dredging, flushing and CCTV detection: high-pressure flushing equipment is used to flush the pipeline to be repaired. In this embodiment, if the pipeline to be repaired is a steel pipe, high-pressure flushing equipment is used to spray alkaline electrolyzed water into the steel pipe. After flushing, a water film is formed on the inner wall of the pipe to prevent rust from affecting the curing effect;

[0071] S5. After the bottom film is pulled in, the defect type of the pipeline to be repaired is determined, and an inner liner pipe corresponding to the defect type is pulled into the pipeline to be repaired;

[0072] S6. After the heads are tied, the inner liner is inflated with air using a high-pressure inflating device so that the inner liner fits the inner wall of the pipe to be repaired;

[0073] S7, pull the ultraviolet curing lamp into the pipe to be repaired for irradiation and curing;

[0074] S8. Remove the tying head and perform port processing.

[0075] In step S8, after the inner liner pipe is cured, the pressure in the pipeline is reduced at a set pressure reduction rate. After the pressure in the pipeline drops to the ambient pressure, the piercing head is removed, the ultraviolet curing lamp is taken out, and the reduced diameter portion of the inner liner pipe port is cut off to make the inner liner pipe port flush with the port of the pipeline to be repaired.

[0076] And the pressure reduction speed is set not more than 0.01MPa / min.

[0077] Therefore, the present invention adopts the above-mentioned ultraviolet curing pipeline repair method to determine the thickness of the liner pipe according to different defect types, which provides a basis for determining the thickness of the liner pipe, can avoid the rupture of the liner pipe due to unreasonable design, and improve the repair quality.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A UV curing pipeline repair method, characterized in that: The following steps are involved: S1. The pipeline to be repaired is divided into non-structural defects and structural defects, and the thickness of the liner pipe is designed for non-structural defects and structural defects respectively; S2. Blocking: Use inflatable airbags to block water in the upstream and downstream of the pipeline to be repaired, and install retaining walls to support the inflatable airbags; S3, Isolation and dewatering: Use a hose to connect the upstream inspection well and the downstream inspection well of the pipeline to be repaired, and use a water pump to pump the water in the upstream inspection well of the pipeline to be repaired to the downstream inspection well, and at the same time pump the accumulated water in the pipeline to be repaired to the downstream inspection well; S4, dredging, flushing and CCTV inspection: Use high-pressure flushing equipment to flush the pipeline to be repaired; S5. After the bottom film is pulled in, the defect type of the pipeline to be repaired is determined, and an inner liner pipe corresponding to the defect type is pulled into the pipeline to be repaired; S6. After the heads are tied, the inner liner is inflated with air using a high-pressure inflating device so that the inner liner fits the inner wall of the pipe to be repaired; S7, pull the ultraviolet curing lamp into the pipe to be repaired for irradiation and curing; S8. Remove the tying head and perform port processing.

2. The method for repairing a pipeline by ultraviolet curing according to claim 1, characterized in that: In step S1, when the defect type is a non-structural defect, the thickness calculation formula of the liner pipe is as follows: in, or Where: t ssr D is the thickness of the liner when the defect type is a non-structural defect, in mm; ssr0 is the outer diameter of the liner when the defect type is a non-structural defect, in mm; K is the circumferential support rate; E L is the long-term elastic modulus of the liner, in MPa; C is the ovality reduction factor; P is the groundwater pressure at the top of the liner, in MPa; N is the safety factor; μ is the Poisson's ratio; q is the ovality of the pipeline to be repaired; D E is the average inner diameter of the pipe to be repaired, in mm; D min D is the minimum inner diameter of the pipe to be repaired, in mm; max is the maximum inner diameter of the pipe to be repaired, in mm; When the ellipticity of the inner liner is ≠0, the minimum thickness t of the inner liner is calculated. ssrmin Satisfies the following expression: Where: SDR is the standard size of the pipeline to be repaired; σ L is the long-term bending strength of the liner pipe, in MPa; When the defect type is a structural defect, the thickness calculation formula of the liner pipe is as follows: in, Where: t sr D is the thickness of the liner when the defect type is a structural defect, in mm; srO is the outer diameter of the liner pipe when the defect type is a structural defect, in mm; q t is the total external pressure of the liner pipe, in MPa; R W is the water buoyancy coefficient; B' is the elastic support coefficient; E' S is the comprehensive deformation modulus of the soil outside the liner pipe, in MPa; H W is the height of the groundwater level above the top of the liner pipe, in m; γ is the soil density, in KN / m 3 ; H is the laying depth of the lining pipe; H S W is the soil thickness of the liner pipe top, in m; S is the live load, in MPa; And the minimum thickness of the liner is t srmin t min Satisfies the following expression: Where: E is the initial elastic modulus of the liner pipe, in MPa.

3. The method for repairing a UV-curable pipeline according to claim 2, characterized in that: The value of K is 7.0; E L Take 50% of the short-term modulus; N is 2.0; μ is 0.3; q is 2%; σ L Take 50% of the short-term strength; The total external pressure of the liner pipe includes groundwater pressure, overburden pressure and live load; R W Greater than 0.

67.

4. The method for repairing a pipeline by ultraviolet curing according to claim 2, characterized in that: When the lined pipe is located above the groundwater level, the SDR is not greater than 100.

5. The method for repairing a pipeline by ultraviolet curing according to claim 4, characterized in that: In step S8, after the inner liner pipe is cured, the pressure in the pipeline is reduced at a set pressure reduction rate. After the pressure in the pipeline drops to the ambient pressure, the piercing head is removed, the ultraviolet curing lamp is taken out, and the reduced diameter portion of the inner liner pipe port is cut off to make the inner liner pipe port flush with the port of the pipeline to be repaired.

6. The method for repairing a pipeline by ultraviolet curing according to claim 5, characterized in that: Set the pressure reduction rate to no more than 0.01MPa / min.

Images