Lined pipe for pipeline repair and preparation method

Abstract

The present invention discloses a liner pipe for pipeline repair, comprising a strip blank, a film layer, and a resin layer. The strip blank is tubular, the film layer is laminated to the inner surface of the strip blank, and the resin layer is located on the outer surface of the strip blank. The film layers include a first film layer, a second film layer, and a third film layer. A gap exists between the first film layer and the second film layer, and the third film layer is located in the gap. The present invention also discloses a method for preparing a liner pipe for pipeline repair, which achieves trenchless pipeline repair by laying the liner pipe in the pipeline to be repaired.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline repair, and in particular to an inner liner pipe for pipeline repair and a preparation method thereof. Background Art

[0002] During the construction and maintenance of urban infrastructure, underground pipelines can often experience cracks, disconnected joints, and groundwater leaks. These can cause road subsidence or even collapse, impacting traffic and normal municipal drainage. Typically, excavation repair techniques are used to repair pipelines, excavating the surface to expose the pipelines and then repairing or even replacing them. However, excavation repairs require isolating the construction area on the road and excavating the pipelines, impacting municipal traffic and surrounding underground pipelines.

[0003] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0004] The purpose of the present invention is to provide a liner pipe for pipeline repair and a preparation method thereof, so as to achieve the purpose of trenchless pipeline repair by laying the liner pipe in the pipeline to be repaired.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A liner pipe for pipeline repair includes a strip blank, a film layer and a resin layer. The strip blank is tubular, the film layer is compounded on the inner surface of the strip blank, and the resin layer is located on the outer surface of the strip blank. The film layer includes a first film layer, a second film layer and a third film layer. There is a gap between the first film layer and the second film layer, and the third film layer is located in the gap.

[0007] As a further improved technical solution of the present invention, the widths of the first film layer and the second film layer are equal.

[0008] As a further improved technical solution of the present invention, the strip blank includes a first part, a second part and two third parts connecting the first part and the second part at both ends along the circumferential direction; the first film layer is compounded on the inner surface of the first part, and the second film layer is compounded on the inner surface of the second part.

[0009] As a further improved technical solution of the present invention, the gap includes a first gap and a second gap, the first gap is formed by the inner surface of one of the third parts, the first side surface of the first film layer and the first side surface of the second film layer, and the second gap is formed by the inner surface of another of the third parts, the second side surface of the first film layer and the second side surface of the second film layer, and a third film layer is formed at both the first gap and the second gap.

[0010] As a further improved technical solution of the present invention, the first film layer and the second film layer have the same thickness, and the maximum thickness of the third film layer is greater than the thickness of the first film layer.

[0011] As a further improved technical solution of the present invention, the third film layer includes a first film layer portion located in the gap and a second film layer portion located outside the gap, and the second film layer portion is respectively compounded with the first film layer and the second film layer.

[0012] The purpose of the present invention is also achieved through the following technical solutions:

[0013] A method for preparing a liner pipe for pipeline repair comprises the following steps:

[0014] Step S1, coating the outer surface of the strip with a coating material to form a thin film layer;

[0015] Step S2, impregnating the inner surface of the strip with resin;

[0016] Step S3, turning the strip blank over as a whole into the pipeline to be repaired, and performing a curing treatment to form an inner liner pipe in the pipeline to be repaired;

[0017] Among them, after being turned over and entering the pipeline to be repaired, the inner surface of the resin-impregnated strip becomes the outer surface of the strip; and the outer surface of the composite film layer becomes the inner surface of the strip.

[0018] As a further improved technical solution of the present invention, step S1 specifically includes the following process:

[0019] The strips are stacked to form a first stacked state, in which the first portion and the second portion are parallel to each other and are both flat, and the two third portions are both in an arc shape;

[0020] applying a coating material to the first portion of the strip blank in the first stacked state to form the first film layer;

[0021] turning the strip blank over so that the outer surface of the second portion faces upward, and applying a coating material to the second portion of the strip blank to form a second film layer;

[0022] Adjusting the strip to a second stacked state, in which the two third parts are in a flat state, and the first part and the second part are folded in half respectively;

[0023] applying a coating material to the third portion of the strip in a flat state to form the third film layer;

[0024] A coating material is applied to the other third portion of the strip in a flat state to form another third film layer.

[0025] As a further improved technical solution of the present invention, the first film layer, the second film layer and the third film layer are made of the same material.

[0026] As a further improved technical solution of the present invention, the overall turning of the strip is performed by using a pneumatic turning method.

[0027] Compared with the existing technology, the present invention completes the CIPP trenchless pipeline repair operation by laying the CIPP pipe in the pipeline to be repaired and allowing the CIPP pipe to solidify on the inner wall of the pipeline to be repaired, forming an inner liner pipe that is tightly integrated with the pipeline to be repaired. There is no need to replace the pipeline or excavate the road surface, thus achieving the purpose of trenchless repair of municipal pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a transverse cross-sectional view of the liner pipe for pipeline repair according to the present invention;

[0029] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle;

[0030] Figure 3 for Figure 2 Schematic diagram of the decomposition;

[0031] Figure 4 for Figure 1 Transverse cross-section of the mid-strip;

[0032] Figure 5 for Figure 1 Transverse cross-section of the middle structure

[0033] Figure 6 This is a flow chart of a method for preparing an inner liner pipe for pipeline repair according to the present invention;

[0034] Figure 7 It is a schematic diagram of the specific process of forming a thin film layer from a strip blank of the present invention. DETAILED DESCRIPTION

[0035] The following exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of devices, products and / or methods consistent with some aspects of the present invention as described in the claims of the present invention.

[0036] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. The singular forms "a", "an", "the" or "the" used in the specification and claims of the present invention are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0037] It should be understood that the words used in the specification and claims of the present invention, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, "one" or "an" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. Unless otherwise specified, the words "front", "back", "upper", "lower" and similar words that appear in the present invention are only for the convenience of description and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprises" are open-ended expressions, meaning that the elements appearing before "include" or "comprises" include the elements appearing after "include" or "comprises" and their equivalents, which does not exclude that the elements appearing before "include" or "comprises" may also include other elements. If "several" appears in the present invention, it means two or more.

[0038] See also Figures 1 to 3 The present invention discloses an inner lining pipe for pipeline repair, comprising a strip blank 1, a film layer 2 and a resin layer 3. The strip blank 1 is tubular, the film layer 2 is compounded on the inner surface of the strip blank 1 to form the inner wall of the inner lining pipe, and the resin layer 3 is located on the outer surface of the strip blank 1.

[0039] See also Figure 2 The film layer 2 includes a first film layer 21, a second film layer 22 and a third film layer 23. The widths of the first film layer 21 and the second film layer 22 are equal. There is a gap between the first film layer 21 and the second film layer 22, and the third film layer 23 is arranged in the gap.

[0040] For details, see Figure 4The strip 1 includes a first part 11, a second part 12 and two third parts 13 connecting the first part 11 and the second part 12 along the circumferential direction; the first film layer 21 is compounded on the inner surface of the first part 11, and the second film layer 22 is compounded on the inner surface of the second part 12.

[0041] See also Figure 5 The gap includes a first gap 201 and a second gap 202. A third film layer 23 is formed at both the first gap 201 and the second gap 202. Specifically, the first gap 201 is formed by the inner surface of one third portion 13, the first side surface of the first film layer 21, and the first side surface of the second film layer 22. The second gap 202 is formed by the inner surface of the other third portion 13, the second side surface of the first film layer 21, and the second side surface of the second film layer 22.

[0042] The first film layer 21 and the second film layer 22 have the same thickness, and the maximum thickness of the third film layer 23 is greater than the thicknesses of the first film layer 21 and the second film layer 22 .

[0043] See also Figure 3 The third film layer 23 includes a first film layer portion 231 located within the gap and a second film layer portion 232 located outside the gap. The second film layer portion 232 is laminated with the first film layer 21 and the second film layer 22, respectively. This arrangement improves the sealing performance of the connection between the third film layer 23 and the first film layer 21 and the second film layer 22 in the gap. The maximum thickness of the third film layer 23 is the sum of the thicknesses of the first film layer portion 231 and the second film layer portion 232.

[0044] The first film layer 21 and the second film layer 22 are made of the same material, such as a polyurethane elastomer film or a polyethylene film, to provide sealing and waterproofing. The two third film layers 23 are made of the same material, such as a polyurethane elastomer film or a polyethylene film. The materials used for the first film layer 21 and the third film layer 23 can be the same or different.

[0045] See also Figure 6 The present invention also discloses a method for preparing an inner liner pipe for pipeline repair, comprising the following steps:

[0046] Step S1, coating the outer surface of the strip 1 with a coating material to form a thin film layer 2;

[0047] In this step, the strip 1 is woven into a cylindrical shape by a circular loom from polyester yarn, and is wound and collected to serve as a reinforcement layer of the CIPP liner pipe.

[0048] See also Figure 7 The specific process of forming the film layer 2 from the strip 1 is as follows:

[0049] The strips 1 are stacked to form a first stacked state, in which the first portion 11 and the second portion 12 are parallel to each other and are both flat, and the two third portions 13 are both in an arc shape;

[0050] The first portion 11 of the strip 1 in the first stacked state is coated with a coating material to form a first film layer 21, wherein the outer surface of the first portion 11 faces upward during the coating process.

[0051] The strip 1 is turned over so that the outer surface of the second portion 12 faces upward, and a coating material is applied to the second portion 12 of the strip 1 to form a second film layer 22;

[0052] The strip 1 is adjusted to a second stacked state, in which the two third portions 13 are flat, and the first portion 11 and the second portion 12 are folded in half;

[0053] Coating a coating material on one of the flat third portions 13 of the strip 1 to form a third film layer 23, wherein during the coating process, the outer surface of the third portion 13 faces upward;

[0054] The coating material is applied to the third portion 13 of the strip 1 in a flat state to form another third film layer 23, wherein the outer surface of the third portion 13 faces upward during the coating process.

[0055] Specifically, the thickness of the strip 1 is 1.5-4 mm, the thickness of the first film layer 21 and the second film layer 22 are both 0.5-1.5 mm, and the maximum thickness of the third film layer 23 is greater than the thickness of the first film layer 21 and the second film layer 22.

[0056] The first film layer 21 and the second film layer 22 are made of the same material, such as a polyurethane elastomer film or a polyethylene film, to provide sealing and waterproofing. The two third film layers 23 are made of the same material, such as a polyurethane elastomer film or a polyethylene film. The materials used for the first film layer 21 and the third film layer 23 can be the same or different.

[0057] The conventional method of coating the strip 1 with a thin film coating requires a corresponding mold. One size specification requires a corresponding set of molds. When the diameter increases, the mold cost is too high and the size is too specific.

[0058] The method for coating the strip 1 with a thin film coating adopted in the present application does not require a corresponding mold, and the equipment only needs to be invested once. It can be used for different sizes and specifications, has a wide range of applications, and saves costs.

[0059] Step S2, impregnating the inner surface of the strip 1 with resin;

[0060] The specific process of impregnating the strip 1 with resin is as follows:

[0061] A sufficient amount of resin is poured into the strip blank 1 and rolled with a rubber roller to ensure that the resin is evenly distributed in the tube and that one end of the strip blank 1 is still a dry tube, not impregnated with resin, and has a certain length. The resin-impregnated part forms a CIPP wet tube.

[0062] Step S3: flipping the strip 1 as a whole into the pipeline to be repaired and performing a curing treatment to form a CIPP liner pipe in the pipeline to be repaired; wherein, after flipping into the pipeline to be repaired, the inner surface of the resin-impregnated strip 1 becomes the outer surface of the strip 1; and the outer surface of the composite film layer becomes the inner surface of the strip 1;

[0063] The specific process is as follows: buckle the unimpregnated dry pipe end on the interface of the flipping device, and use a shrink tape to fix the pipe end and the interface of the flipping device to prevent slipping;

[0064] Compressed air is pumped into the belt turning device, forcing the CIPP tube out of the interface of the turning device by squeezing the inner layer outward. The tube is then guided by the guide tube and turned into the pipe to be repaired. After entering the pipe to be repaired, the CIPP tube continues to turn forward due to the action of air pressure. At the same time, after turning, the outer surface impregnated with resin contacts the pipe to be repaired, and the air pressure adheres to the pipe.

[0065] The compressed gas introduced into the tape turning device is replaced with steam and introduced into the CIPP pipe to heat and solidify the resin while ensuring a certain pressure so that the resin-impregnated tape 1 is in close contact with the pipe to be repaired.

[0066] Specifically, the guide tube is a flexible hose with a larger inner diameter than the CIPP pipe. One end of the hose is inserted into the interface of the inversion device, and the other end is inserted into the inlet of the pipe to be repaired. This hose serves as a guide, guiding the inverted CIPP pipe into the pipe to be repaired.

[0067] In this embodiment, the resin used is only thermosetting resin, which is cured by heat to achieve close contact with the repaired pipe.

[0068] In other embodiments, water-swellable rubber may be added to the resin to form an impregnating material. A sufficient amount of the impregnating material is poured into the CIPP dry pipe, and the CIPP dry pipe is rolled with a rubber roller to ensure that the impregnating material is evenly distributed in the pipe. It is also ensured that one end of the CIPP pipe remains a dry pipe that is not impregnated with the material and has a certain length. The portion impregnated with the material forms a CIPP wet pipe.

[0069] Water-swellable rubber includes natural rubber and water-absorbing resins. When there is a gap between the CIPP liner and the pipe to be repaired, the intruding water can cause the rubber to spontaneously and rapidly expand, filling the gap and thus acting as a seal.

[0070] In summary, compared with the prior art, the preparation method of the inner liner pipe for pipeline repair of the present invention has the following advantages: the CIPP pipe is laid in the pipeline to be repaired by the flipping method, and the CIPP pipe is solidified on the inner wall of the pipeline to be repaired, forming a CIPP inner liner pipe tightly integrated with the pipeline to be repaired, thereby completing the CIPP trenchless pipeline repair operation without replacing the pipeline or excavating the road surface, thereby achieving the purpose of trenchless repair of municipal pipelines.

[0071] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. A liner pipe for pipeline repair, characterized in that: The invention comprises a strip blank (1), a film layer (2) and a resin layer (3), wherein the film layer (2) is compounded on the inner surface of the strip blank (1), and the resin layer (3) is located on the outer surface of the strip blank (1); the film layer (2) comprises a first film layer (21), a second film layer (22) and a third film layer (23); there is a gap between the first film layer (21) and the second film layer (22), and the third film layer (23) is located at the gap; the first film layer (21) and the second film layer (22) have the same width; the strip blank (1) comprises a first part (11), a second part (12) and two third parts (13) connecting the two ends of the first part (11) and the second part (12) along the circumferential direction; the first film layer (21) is compounded on the inner surface of the first part (11), and the second film layer ( 22) is compounded on the inner surface of the second part (12), the gap includes a first gap (201) and a second gap (202), the first gap (201) is formed by the inner surface of one of the third parts (13), the first side surface of the first film layer (21) and the first side surface of the second film layer (22), the second gap (202) is formed by the inner surface of another of the third parts (13), the second side surface of the first film layer (21) and the second side surface of the second film layer (22), the third film layer (23) is formed at the first gap (201) and the second gap (202), the thickness of the first film layer (21) and the second film layer (22) are the same, and the maximum thickness of the third film layer (23) is greater than the thickness of the first film layer (21).

2. The liner pipe for pipeline repair according to claim 1, characterized in that: The third film layer (23) includes a first film layer portion (231) located in the gap and a second film layer portion (232) located outside the gap, and the second film layer portion (232) is respectively compounded with the first film layer (21) and the second film layer (22).

3. A method for preparing a liner pipe for pipeline repair, based on the liner pipe for pipeline repair according to any one of claims 1 to 2, characterized in that: The steps include: Step S1, coating the outer surface of the strip (1) with a coating material to form a thin film layer (2); Step S2, impregnating the inner surface of the strip (1) with resin; Step S3, turning the strip (1) over as a whole into the pipeline to be repaired, and performing a curing treatment to form an inner liner pipe in the pipeline to be repaired; After being turned over and entering the pipe to be repaired, the inner surface of the resin-impregnated strip (1) becomes the outer surface of the strip; and the outer surface of the composite film layer becomes the inner surface of the strip (1).

4. The method for preparing a liner pipe for pipeline repair according to claim 3, characterized in that: Step S1 specifically includes the following process: The strip blanks (1) are stacked to form a first stacked state, in which the first portion (11) and the second portion (12) are parallel to each other and are both flat, and the two third portions (13) are both in an arc shape; Applying a coating material to the first portion (11) of the strip blank (1) in the first stacked state to form the first film layer (21); Turning the strip blank (1) over so that the outer surface of the second portion (12) faces upward, and applying a coating material to the second portion (12) of the strip blank (1) to form a second film layer (22); Adjusting the strip (1) to a second stacked state, in which the two third parts (13) are in a flat state, and the first part (11) and the second part (12) are folded in half respectively; Applying a coating material to one of the third portions (13) of the strip (1) in a flat state to form the third film layer (23); A coating material is applied to the other third portion (13) of the strip (1) in a flat state to form another third film layer (23).

5. The method for preparing a liner pipe for pipeline repair according to claim 4, characterized in that: The first film layer (21), the second film layer (22) and the third film layer (23) are made of the same material.

6. The method for preparing a liner pipe for pipeline repair according to claim 3, characterized in that: The overall turning of the strip (1) is performed by using an air pressure turning method.

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