Lining pipe for pipeline repair and method of manufacturing

Abstract

The application discloses a liner pipe for pipeline repair, which comprises a tape blank, a film layer and a resin layer, the tape blank is tubular, the film layer is compounded on the inner surface of the tape blank, and the resin layer is located on the outer surface of the tape blank, the film layer comprises 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 at the gap. The application further discloses a preparation method of the liner pipe for pipeline repair, and the purpose of trenchless pipeline repair is achieved by laying the liner pipe in a pipeline to be repaired.

Description

Technical Field

[0001] This invention relates to the field of pipeline repair technology, and in particular to an inner lining pipe for pipeline repair and its preparation method. Background Technology

[0002] In the construction and maintenance of urban infrastructure, issues such as ruptured underground pipes, detached pipe joints, and groundwater leakage are often discovered. These can lead to road subsidence or even collapse, disrupting traffic and normal municipal drainage. Typically, open-cut repair techniques are used to repair these pipes, excavating the surface to expose the pipes and then repairing or even replacing them. However, open-cut pipe repair requires isolating the construction area on the road surface and excavating the pipes, impacting municipal traffic and surrounding underground pipelines.

[0003] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0004] The purpose of this invention is to provide a liner pipe for pipeline repair and a method for preparing it, thereby achieving trenchless pipeline repair by laying the liner pipe inside the pipeline to be repaired.

[0005] The objective of this invention is achieved through the following technical solution: A pipe liner for pipe repair includes a strip blank, a film layer, and a resin layer. The strip blank is tubular, the film layer is laminated 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 at the gap.

[0006] As a further improvement of the present invention, the widths of the first thin film layer and the second thin film layer are equal.

[0007] 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 two ends of the first part and the second part in the circumferential direction; the first thin film layer is laminated on the inner surface of the first part and the second thin film layer is laminated on the inner surface of the second part.

[0008] 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. The second gap is formed by the inner surface of the other third part, the second side surface of the first film layer and the second side surface of the second film layer. A third film layer is formed at both the first gap and the second gap.

[0009] As a further improvement of the present invention, the first thin film layer and the second thin film layer have the same thickness, and the maximum thickness of the third thin film layer is greater than the thickness of the first thin film layer.

[0010] As a further improved technical solution of the present invention, the third thin film layer includes a first film layer portion located within the gap and a second film layer portion located outside the gap, wherein the second film layer portion is composited with the first thin film layer and the second thin film layer respectively.

[0011] The objective of this invention is also achieved through the following technical solutions: A method for preparing a pipe liner for pipe repair includes the following steps: Step S1: Coating material is applied to the outer surface of the strip to form a thin film layer; Step S2: Impregnate the inner surface of the blank with resin; Step S3: The entire strip blank is flipped over into the pipe to be repaired and cured to form an inner lining pipe inside the pipe to be repaired. In this process, after being flipped into the pipe to be repaired, the inner surface of the resin-impregnated strip becomes the outer surface of the strip blank; and the outer surface of the composite film layer becomes the inner surface of the strip blank.

[0012] 1. As a further improvement of the present invention, step S1 specifically includes the following process: The strip blanks are stacked to form a first stacked state, in which the first part and the second part are parallel to each other and are both flat, and the two third parts are both arc-shaped. A coating material is applied to the first portion of the strip blank in the first stacked state to form the first thin film layer; The strip blank is flipped so that the outer surface of the second portion faces upward, and a coating material is applied to the second portion of the strip blank to form a second thin film layer; The strip blank is adjusted to a second folded state, in which the two third parts are flat and the first part and the second part are folded in half respectively; A coating material is applied to one of the flattened third portions of the strip blank to form the third thin film layer; A coating material is applied to another flattened portion of the strip blank to form another third thin film layer.

[0013] As a further improvement of the present invention, the first thin film layer, the second thin film layer and the third thin film layer are made of the same material.

[0014] As a further improvement of the present invention, the overall flipping of the strip blank is carried out by a pneumatic flipping method.

[0015] Compared to existing technologies, this invention lays CIPP pipes inside the pipeline to be repaired and solidifies the CIPP pipes onto the inner wall of the pipeline to be repaired, forming an inner lining pipe that is tightly bonded to the pipeline to be repaired. This completes the CIPP trenchless pipeline repair operation without replacing the pipeline or excavating the road surface, thus achieving the purpose of trenchless repair of municipal pipelines. Attached Figure Description

[0016] Figure 1 This is a transverse cross-sectional view of the inner lining pipe for pipe repair according to the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 for Figure 2 A schematic diagram of the decomposition process; Figure 4 for Figure 1 Transverse cross-sectional view of the strip billet; Figure 5 for Figure 1 Transverse cross-sectional view of the middle part of the structure Figure 6 This is a flowchart illustrating the preparation method of the pipeline repair liner of the present invention; Figure 7 This is a schematic diagram illustrating the specific process of forming a thin film layer on a blank according to the present invention. Detailed Implementation

[0017] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of the present invention as set forth in the claims.

[0018] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. The singular forms “a,” “the,” or “the” as used in the specification and claims of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features. Similarly, the terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "before," "after," "upper," "lower," and similar words appearing in this invention are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" are an open-ended expression, meaning that the element preceding "comprising" or "including" encompasses the element following "comprising" or "including" and its equivalents, but this does not preclude the element preceding "comprising" or "including" from also including other elements. In this invention, the term "several" means two or more.

[0020] See Figures 1 to 3 The present invention discloses an inner liner for pipe 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 laminated on the inner surface of the strip blank 1 to form the inner wall of the inner liner, and the resin layer 3 is located on the outer surface of the strip blank 1.

[0021] See Figure 2 The thin film layer 2 includes a first thin film layer 21, a second thin film layer 22 and a third thin film layer 23. The first thin film layer 21 and the second thin film layer 22 have the same width. There is a gap between the first thin film layer 21 and the second thin film layer 22. The third thin film layer 23 is disposed at the gap.

[0022] For details, see Figure 4 The strip 1 includes 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; a first thin film layer 21 is laminated on the inner surface of the first part 11 and a second thin film layer 22 is laminated on the inner surface of the second part 12.

[0023] See Figure 5The gaps include a first gap 201 and a second gap 202, and a third thin 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 of the third portions 13, the first side surface of the first thin film layer 21, and the first side surface of the second thin film layer 22, and the second gap 202 is formed by the inner surface of the other third portion 13, the second side surface of the first thin film layer 21, and the second side surface of the second thin film layer 22.

[0024] The first thin film layer 21 and the second thin film layer 22 have the same thickness, and the maximum thickness of the third thin film layer 23 is greater than the thickness of the first thin film layer 21 and the second thin film layer 22.

[0025] See Figure 3 The third thin 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 thin film layer 21 and the second thin film layer 22 respectively. This arrangement improves the sealing performance of the connection between the third thin film layer 23 and the first thin film layer 21 and the second thin film layer 22 at the gap. The maximum thickness of the third thin film layer 23 refers to the sum of the thicknesses of the first film layer portion 231 and the second film layer portion 232.

[0026] 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, and serve to seal and waterproof. The two third film layers 23 are made of the same material, such as a polyurethane elastomer film or a polyethylene film. The first film layer 21 and the third film layer 23 may be made of the same material or different materials.

[0027] See Figure 6 The present invention also discloses a method for preparing an inner lining pipe for pipeline repair, comprising the following steps: Step S1: Coating material is applied to the outer surface of the strip 1 to form a thin film layer 2; In this step, the strip 1 is made of polyester yarn woven into a cylindrical shape by a circular loom and then wound and collected to serve as a reinforcing layer for the CIPP inner liner tube.

[0028] See Figure 7 The specific process of forming the thin film layer 2 from the blank 1 is as follows: The strip 1 is stacked to form a first stacked state, in which the first part 11 and the second part 12 are parallel to each other and are both flat, and the two third parts 13 are both arc-shaped. A coating material is applied to the first portion 11 of the strip blank 1 in the first stacked state to form a first thin film layer 21, wherein, during the coating process, the outer surface of the first portion 11 faces upward. The strip 1 is flipped so that the outer surface of the second part 12 faces upward, and a coating material is applied to the second part 12 of the strip 1 to form a second thin film layer 22; Adjust the strip 1 to the second overlapping state, in which the two third parts 13 are flat, and the first part 11 and the second part 12 are folded in half respectively; A coating material is applied to one of the flat third portions 13 of the strip 1 to form a third thin film layer 23, wherein the outer surface of the third portion 13 faces upward during the coating process; A coating material is applied to another flat third portion 13 of the strip 1 to form another third thin film layer 23, wherein, during the coating process, the outer surface of the third portion 13 faces upward. Specifically, the thickness of the strip 1 is 1.5-4 mm, and the thicknesses of the first thin film layer 21 and the second thin film layer 22 are both 0.5-1.5 mm. The maximum thickness of the third thin film layer 23 is greater than the thicknesses of the first thin film layer 21 and the second thin film layer 22.

[0029] 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, and serve to seal and waterproof. The two third film layers 23 are made of the same material, such as a polyurethane elastomer film or a polyethylene film. The first film layer 21 and the third film layer 23 may be made of the same material or different materials.

[0030] The traditional method of coating a blank with a thin film requires a corresponding mold. One set of molds is needed for each size specification. When the diameter increases, the cost of the molds becomes too high and the size is too specific.

[0031] The method of coating a blank with a thin film using the present application does not require a corresponding mold, 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.

[0032] Step S2: Impregnate the inner surface of the blank 1 with resin; The specific process of impregnating the blank 1 with resin is as follows: Sufficient resin is poured into the inside of the strip blank 1, and the strip blank 1 is rolled with a rubber roller to ensure that the resin is evenly distributed inside the tube, and to ensure that one end of the strip blank 1 is still a dry tube, not impregnated with resin, and has a certain length. The part impregnated with resin forms a CIPP wet tube.

[0033] Step S3: The strip blank 1 is flipped over and placed into the pipe to be repaired, and then cured to form a CIPP inner liner inside the pipe to be repaired; wherein, after being flipped into the pipe to be repaired, the inner surface of the resin impregnation becomes the outer surface of the strip blank 1; and the outer surface of the composite film layer becomes the inner surface of the strip blank 1. The specific process is as follows: the unimpregnated dry tube end is flipped over and placed at the interface of the flipping device, and the tube end is fixed to the interface of the flipping device with shrink tape to prevent slippage; Compressed air is pumped into the flipping device, which forces the CIPP tube out from the interface of the flipping device by squeezing it from the inside out. The tube is then guided by the guide tube and flipped into the pipe to be repaired. After entering the pipe, the CIPP tube continues to flip forward due to air pressure. At the same time, after flipping, the resin-impregnated outer surface comes into contact with the pipe to be repaired and adheres to it due to air pressure.

[0034] The compressed gas introduced into the tape turning device is replaced with steam, which is then introduced into the CIPP pipe to heat and cure the resin, while maintaining a certain pressure. The resin-impregnated tape blank 1 is then tightly attached to the pipe to be repaired.

[0035] Specifically, the guide tube is a flexible tube with an inner diameter larger than that of the CIPP tube. One end of the flexible tube is connected to the interface of the flipping device, and the other end is introduced into the inlet of the pipe to be repaired. The function of this flexible tube is to guide the flipped CIPP tube into the pipe to be repaired.

[0036] In this embodiment, only thermosetting resin is used. The thermosetting resin is cured by heat to achieve a tight fit with the repaired pipe.

[0037] In other embodiments, water-swellable rubber can be added to the resin to form an impregnation material. Sufficient impregnation material is poured into the CIPP dry pipe, and the CIPP dry pipe is rolled with a rubber roller to ensure that the impregnation material is evenly distributed inside the pipe and that one end of the CIPP pipe remains a dry pipe without impregnation material and has a certain length. The part impregnated with the material forms a CIPP wet pipe.

[0038] Water-swellable rubbers include natural rubber and superabsorbent polymers. When there is a gap between the CIPP liner and the pipe to be repaired, the intruding water can cause the rubber to expand spontaneously and rapidly, filling the gap and thus providing a seal.

[0039] In summary, compared with the prior art, the method for preparing the inner lining pipe for pipeline repair of the present invention has the following advantages: by using the flipping method, the CIPP pipe is laid inside the pipeline to be repaired, and the CIPP pipe is solidified on the inner wall of the pipeline to be repaired, forming a CIPP inner lining pipe that is tightly bonded to the pipeline to be repaired, thereby completing the CIPP trenchless pipeline repair operation without replacing the pipeline or excavating the road surface, thus achieving the purpose of trenchless repair of municipal pipelines.

[0040] 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 those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A liner pipe for pipe repair, characterized in that, The strip includes a blank (1), a thin film layer (2), and a resin layer (3). The thin film layer (2) is laminated on the inner surface of the blank (1), and the resin layer (3) is located on the outer surface of the blank (1). The thin film layer (2) includes a first thin film layer (21), a second thin film layer (22), and a third thin film layer (23). There is a gap between the first thin film layer (21) and the second thin film layer (22), and the third thin film layer (23) is located at the gap. The widths of the first thin film layer (21) and the second thin film layer (22) are equal. The blank (1) includes 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) in the circumferential direction. The first thin film layer (21) is laminated on the inner surface of the first part (11), and the second thin film layer (22) is laminated on the inner surface of the second part (12). The gap includes a first gap (201) and a second gap. The first gap (201) is formed by the inner surface of one of the third parts (13), the first side of the first film layer (21) and the first side of the second film layer (22). The second gap (202) is formed by the inner surface of the other third part (13), the second side of the first film layer (21) and the second side of the second film layer (22). The third film layer (23) is formed at both the first gap (201) and the second gap (202). The first film layer (21) and the second film layer (22) have the same thickness. The maximum thickness of the third film layer (23) is greater than the thickness of the first film layer (21). The first film layer (21) and the second film layer (22) are made of the same material. The two third film layers (23) are made of the same material. The first film layer (21) and the third film layer (23) can be made of the same material or different material.

2. The pipe liner for pipeline repair according to claim 1, characterized in that, The first film layer (21), the second film layer (22), and the third film layer (23) can be polyurethane elastomer film or polyethylene film.

3. The pipe liner for pipeline repair according to claim 1, characterized in that, The thickness of the strip (1) is 1.5-4 mm, and the thicknesses of the first thin film layer (21) and the second thin film layer (22) are relatively 0.5-1.5 mm.

4. A method for preparing a pipeline repair liner, based on the pipeline repair liner according to any one of claims 1-3, characterized in that, Includes the following steps: Step S1: Coating material is applied to the outer surface of the blank (1) to form a thin film layer (2); The blank (1) is made of polyester yarn woven into a cylindrical shape by a circular loom and then wound and collected as a reinforcing layer for the CIPP inner liner tube; Step S2, impregnate the inner surface of the blank (1) with resin; Step S3: The strip blank (1) is flipped over as a whole into the pipe to be repaired and cured to form an inner lining pipe in the pipe to be repaired.

5. The method for preparing the pipeline repair liner according to claim 4, characterized in that, Step S2 specifically includes the following process: Sufficient resin is poured into the inside of the strip blank (1), and the strip blank (1) is 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 part impregnated with resin forms a CIPP wet tube.

6. The method for preparing the pipeline repair liner according to claim 4, characterized in that, Step S3 specifically includes the following process: Turn the unimpregnated dry tube end upside down onto the interface of the flipping device, and use shrink tape to fix the tube end to the interface of the flipping device to prevent slippage; Compressed air is pumped into the flipping device to push the CIPP tube out from the interface of the flipping device by squeezing from the inside out. It is then guided by the guide tube to flip into the pipe to be repaired. After the CIPP tube enters the pipe to be repaired, it continues to flip forward due to air pressure. At the same time, after flipping, the resin-impregnated outer surface comes into contact with the pipe to be repaired and is then bonded together due to air pressure. The compressed gas introduced into the tape turning device is replaced with steam, which is introduced into the CIPP pipe to heat and cure the resin, while ensuring a certain pressure. The resin-impregnated tape blank (1) is in close contact with the pipe to be repaired.

7. The method for preparing a pipeline repair liner according to claim 6, characterized in that, The guide tube uses a flexible tube with an inner diameter larger than that of the CIPP tube. One end of the flexible tube is connected to the interface of the flipping device, and the other end of the flexible tube is introduced into the inlet of the pipe to be repaired.

8. The method for preparing a pipeline repair liner according to claim 7, characterized in that, The resin used is only thermosetting resin, which is cured by heat to achieve a tight fit with the repaired pipe.

9. The method for preparing a pipeline repair liner according to claim 8, characterized in that, Water-swellable rubber is added to the resin to form an impregnation material. Sufficient impregnation material is poured into the CIPP dry pipe, and the CIPP dry pipe is rolled with a rubber roller to ensure that the impregnation material is evenly distributed inside the pipe. It is also ensured that one end of the CIPP pipe remains dry and unimpregnated with the material, and has a certain length. The part impregnated with the material forms the CIPP wet pipe.

10. The method for preparing a pipeline repair liner according to claim 9, characterized in that, Water-swellable rubbers include natural rubber and water-absorbing resins. When there is a gap between the CIPP inner liner and the pipe to be repaired, the intruding water can cause the rubber to expand spontaneously and rapidly, filling the gap and thus achieving a sealing effect.

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