A method of repairing a pipe using a non-excavation method and a profile, a locking structure for repairing a pipe using a non-excavation method

Abstract

The utility model relates to a kind of non-excavation repair pipeline and profile for non-excavation pipeline repair, when profile spiral winding forms pipeline, the male sacrifice lock and the female sacrifice lock of two adjacent profile edges are locked to form sacrifice lock, the male basic lock and the female basic lock are locked to form basic lock, the lock groove of female sacrifice lock is equipped with adhesive strip, so that male sacrifice lock is firmly locked, while spiral winding pipeline, sealing glue solution is injected into the circular groove of female basic lock by glue injection equipment, so that after male basic lock and female basic lock are engaged, sealing glue solution fills the gap between male basic lock and female basic lock and plays sealing effect. Since the lock head of male basic lock is substantially symmetrical circular arc shape in cross section, the circular groove of female basic lock cooperates with the lock head of male basic lock similar to hinged connection, the lock head of male basic lock can be easily deflected in the circular groove of female basic lock and not easy to come out, so it has good bending capacity.

Description

Technical Field

[0001] This utility model relates to a trenchless pipeline repair method and a profile and locking structure for trenchless pipeline repair, belonging to the field of trenchless pipeline repair technology. Background Technology

[0002] Urban underground pipe networks play a crucial role in water supply and drainage. With the accelerating pace of urbanization in my country, the maintenance and repair of underground pipelines are receiving increasing attention. The traditional method of excavating and replacing pipes is not only a large-scale project, consuming significant manpower and resources, but also has a long construction period and is prone to causing traffic congestion, environmental pollution, and other problems, thus becoming a constraint on the sustainable development of modern cities.

[0003] In contrast, trenchless pipeline repair technology, because it eliminates the need for excavation, allows for in-situ repairs with minimal disruption to traffic, significantly reducing interference with the surrounding environment, social order, and economic activities, and is therefore widely used in the pipeline repair field. Among these technologies, spiral winding trenchless repair, as an advanced process, uses a continuous profile spirally propelled by a winding machine, causing adjacent profiles to interlock via a locking structure, ultimately forming a structurally stable new pipeline inside the old one. However, existing spiral expansion pipes made from profiles have poor adaptability to the original pipeline structure and cannot fit the original pipeline well, especially in cases where the original pipeline has bends, curves, or misaligned joints, or in older pipelines with poor geometric integrity. When the spiral pipe made from profiles is bent, the locking mechanism is prone to disengagement, damage, or deterioration of the sealant, leading to poor sealing. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a trenchless repair pipe and a profile and locking structure for trenchless pipe repair, the pipe made therefrom can better adapt to pipe deformation and has good bending ability.

[0005] To achieve the above objectives, this utility model provides a profile for trenchless pipeline repair, including a profile body, the inner side of the profile body being used to form the inner wall of the pipeline, a male sacrificial lock and a male foundation lock on the first side of the profile body, and a female sacrificial lock and a female foundation lock on the second side of the profile body.

[0006] The male base lock includes a connecting part and a lock head. The connecting part is connected to the outer side of the profile body, and the lock head is connected to the end of the connecting part. The cross-sectional profile of the lock head includes a flat top and first arcuate portions on both sides of the flat top. The female base lock has an arcuate groove for engaging the connecting head. The cross-sectional profile of the arcuate groove includes a flat bottom and second arcuate portions on both sides of the flat bottom. The male base lock has a first surface on both sides, and the female sacrificial lock and the female base lock have a second surface. When the male base lock and the female base lock are engaged, there is a first gap between the first surface and the second surface. The arcuate groove of the female base lock has an arcuate transition groove edge on both sides of the groove edge, and the groove edge protrudes from the second surface.

[0007] Preferably, when the male foundation latch and the female foundation latch are engaged, there is a second gap between the latch head and the arc groove.

[0008] More preferably, the second gap is 0.25-0.35 mm.

[0009] Preferably, the wall thickness of the base lock of the profile is 1.2-2 mm, and the radius of the arc of the groove edge is 0.3-0.9 mm.

[0010] Preferably, the gap between the groove edge of one section of the profile and the second surface of the other section of the profile that engages with it is 0.4-0.6 mm.

[0011] Preferably, the male foundation lock is provided with an auxiliary rib on the side away from the male sacrificial lock. When the male foundation lock is engaged with the female foundation lock, the auxiliary rib presses the female foundation lock toward the male foundation lock.

[0012] Corresponding to the above-mentioned profile for trenchless pipeline repair, this utility model also provides a profile locking structure for trenchless pipeline repair, comprising a first profile and a second profile spirally wound and locked together. Both the first profile and the second profile adopt the profile for trenchless pipeline repair described in the above technical solution. The male base lock of the first profile is locked with the female base lock of the second profile, and the male sacrificial lock of the first profile is locked with the female sacrificial lock of the second profile. When the center surfaces of the male base lock and the female base lock are aligned, there is a first gap between the first surface and the second surface, and there is a second gap between the lock head and the arc groove.

[0013] Preferably, the male base lock can be deflected in the arc groove of the female base lock such that the arc groove and the lock head are on the same side of the arc groove, achieving the following state: the top of the second arc portion of the arc groove abuts against the first surface at position A1, the connecting part of the lock head abuts against the inner edge of the second arc portion of the arc groove at position A2, and the first arc portion of the lock head abuts against the flat bottom of the arc groove at position A3, thereby forming a first sealant cavity between A1 and A2, and a second sealant cavity between A2 and A3.

[0014] Preferably, the male foundation latch deflects at an angle C1 within the arc groove of the female foundation latch in the range of 0-12°.

[0015] Corresponding to the above-mentioned profile for trenchless pipeline repair of this utility model, this utility model also provides a trenchless pipeline repair method, which is made by spiral winding of the profile for trenchless pipeline repair described in the above technical solution.

[0016] Preferably, the complementary angle between the projection of the profile winding line onto the midpoint of the wound pipe and the pipe axis is defined as the helix angle C2, and the helix angle C2 ranges from 2° to 6.5°.

[0017] Preferably, the profile width is 45-55 mm, the diameter of the pipe made by spiral winding of the profile is 130-250 mm, and the spiral angle C2 ranges from 5° to 6.5°.

[0018] This utility model relates to a profile for trenchless pipeline repair, which has the following beneficial effects: When the profile for trenchless pipeline repair of this utility model is spirally wound to form a pipeline, the male sacrificial lock and the female sacrificial lock on two adjacent rings of the profile engage to form a sacrificial lock, and the male base lock and the female base lock engage to form a base lock. An adhesive strip is provided in the lock groove of the female sacrificial lock, ensuring that the male sacrificial lock is firmly locked. Simultaneously with the spiral winding of the pipeline, sealant is injected into the arc groove of the female base lock using an injection device. After the male and female base locks are engaged, the sealant fills the gap between them, thus providing a seal. Because the cross-section of the lock head of the male base lock is a basically symmetrical arc shape, the arc groove of the female base lock and the lock head of the male base lock cooperate similarly to a hinged connection. The lock head of the male base lock can easily deflect within the arc groove of the female base lock without easily coming out, thus providing good bending capability. Attached Figure Description

[0019] Figure 1 This diagram illustrates the locking connection between adjacent turns of profile spirally wound to form a pipeline for trenchless pipeline repair, according to the present invention.

[0020] Figure 2This is a magnified view of the profile locking connection.

[0021] Figure 3 This is an exploded view showing the profile latch connection.

[0022] Figure 4 This is a schematic diagram showing the bending deformation at the buckle position of the profile.

[0023] Figure 5 Displayed as Figure 4 A magnified view at point F in the middle.

[0024] Figure 6 This is a cross-sectional view of a profile-wound duct.

[0025] Figure 7 This diagram shows the bending angle of a pipe with a spiral profile.

[0026] Component designation explanation

[0027] 1- Profile Body

[0028] 11-Public Sacrifice Lock

[0029] 12-Mother Sacrifice Lock

[0030] 13-Public base lock

[0031] 131-Connecting part

[0032] 132-Lock Head

[0033] 1321 - First Arc

[0034] 1322-Flat Top

[0035] 14-Mother base lock

[0036] 141-Circular groove

[0037] 1411-Slot Edge

[0038] 1412 - Flat Bottom

[0039] 1413 - Second Arc

[0040] 15-First Page

[0041] 16-Second page

[0042] 17-Auxiliary reinforcement

[0043] 18-Reinforcing Rib

[0044] 19-Adhesive strip

[0045] 2-steel wire

[0046] 3-First gap

[0047] 4-Second gap

[0048] 5-Spiral Expansion Pipe Detailed Implementation

[0049] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0050] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0051] This utility model relates to profiles for trenchless pipeline repair, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes a profile body 1, the inner surface of which forms the inner wall of a pipe. A first side of the profile body 1 is provided with a female sacrificial latch 1211 and a male foundation latch 13, and a second side of the profile body 1 is provided with a female sacrificial latch 1211 and a female foundation latch 14. The male foundation latch 13 includes a connecting portion 131 and a latch head 132. The connecting portion 131 is connected to the outer surface of the profile body 1, and the latch head 132 is connected to the end of the connecting portion 131. The cross-sectional profile of the latch head 132 includes a flat top 1322 and first arcuate portions 1321 on both sides of the flat top 1322. The female foundation latch 1211... 4 has an arcuate groove 141 for engaging the connector, the cross-sectional profile of the arcuate groove 141 including a flat bottom 1412 and second arcuate portions 1413 on both sides of the flat bottom 1412; the male base lock 13 has a first surface 15 on both sides, and the female sacrificial lock and the female base lock 14 have a second surface 16 between them, when the male base lock 13 and the female base lock 14 are engaged, there is a first gap 3 between the first surface 15 and the second surface 16; the arcuate groove 141 of the female base lock 14 has an arcuate transition groove edge portion 1411 on both sides of its cross-section, and the groove edge portion 1411 protrudes from the second surface 16.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, during the spiral winding process to form a pipe, the female sacrificial lock 1211 of two adjacent profile edges locks with the female sacrificial lock to form a sacrificial lock, and the male base lock 13 locks with the female base lock 14 to form a base lock. The lock groove of the female sacrificial lock is provided with an adhesive strip 19, so that the female sacrificial lock 1211 is firmly locked. At the same time as the spiral winding of the pipe, sealant is injected into the arc groove 141 of the female base lock 14 through the glue injection equipment. In this way, after the male base lock 13 and the female base lock 14 are engaged, the sealant fills the gap between the male base lock 13 and the female base lock 14 and plays a sealing role. Because the cross-section of the locking head 132 of the male foundation lock 13 is a basically symmetrical arc shape, and the arc groove 141 of the female foundation lock 14 and the locking head 132 of the male foundation lock 13 cooperate in a manner similar to a hinged connection, the locking head 132 of the male foundation lock 13 can easily deflect within the arc groove 141 of the female foundation lock 14 without easily disengaging, thus exhibiting good bending capability. Please refer to... Figure 2 and Figure 3 Because the groove edges on both sides of the arcuate groove 141 of the female foundation lock 14 have arcuate transition groove edge portions 1411, and the groove edge portions 1411 protrude beyond the second surface 16 between the female sacrificial lock and the female foundation lock 14, please refer to... Figure 4 and Figure 5 When the pipeline bends, the locking head 132 of the male foundation locking buckle 13 deflects in the arc groove 141 of the female foundation locking buckle 14. The connecting part 131 and the first surface 15 of the root of the connecting part 131 will fit against the surface of the arc transition groove edge 1411 and rotate, without causing excessive interference or compression that could lead to excessive stress and material crushing damage. The profiles used for trenchless pipeline repair involved in this utility model are generally thinner profiles, with the wall thickness of the female foundation locking buckle 14 being 1.2-2 mm and the arc radius of the groove edge 1411 being 0.3-0.9 mm.

[0053] Please refer to Figure 2 and Figure 3When the male base lock 13 and the female base lock 14 are engaged, there is a second gap 4d1 between the groove edge 1411 of one section of the profile and the second surface 16 of the other section of the profile that is engaged. The range of the second gap 4d1 is 0.4-0.6 mm, approximately 0.5 mm. Because of the second gap 4, when the locking head 132 of the male foundation lock 13 deflects in the arc groove 141 of the female foundation lock 14, the first surface 15 at the root of the connecting part 131 will only contact the groove edge 1411 of the female foundation lock 14 when the connecting part 131 deflects to a certain angle. This allows the male foundation lock 13 to rotate more flexibly in the arc groove 141 of the female foundation lock 14. The first surface 15 at the root of the connecting part 131 will not excessively compress the groove edge 1411 of the female foundation lock 14, causing the groove edge 1411 to deform. The resistance force and internal stress when the pipe bends are small, so it is not easy for the male foundation lock 13 and the female foundation lock 14 to disengage. The second gap 4 is preferably in the range of 0.25-0.35 mm. This ensures that the locking head 132 of the male foundation lock 13 can be flexibly deflected in the arc groove 141 of the female foundation lock 14, and also prevents the adhesive injected into the arc groove 141 of the female foundation lock 14 from leaking out.

[0054] To prevent the female foundation lock 14 from deforming excessively when the pipeline bends, which could lead to the male foundation lock 13 coming off, an auxiliary rib 17 is provided on the side of the male foundation lock 13 away from the female sacrificial lock 1211. When the male foundation lock 13 and the female foundation lock 14 are engaged, the auxiliary rib 17 presses the female foundation lock 14 toward the male foundation lock 13.

[0055] This utility model relates to a method for forming a pipeline by spiral winding profiles for trenchless pipeline repair. During the spiral winding of the profiles, sealant is injected into the arc groove 141 of the base lock 14. After the sealant solidifies, it acts as a sealant. A steel wire 2 is pre-embedded between the sacrificial lock and the base lock. By pulling out the steel wire 2 and cutting the base sacrificial lock 1211, the locking force of the base lock alone is insufficient to resist the torsional force applied to the pipeline when the spiral winding machine continues to spiral wind. The pipeline with the base sacrificial lock 1211 cut off can expand radially.

[0056] like Figures 1 to 3As shown, the female sacrificial lock 1211 of the profile used for trenchless pipeline repair involved in this utility model has an arrow-shaped structure, and an adhesive strip 19 is provided in the female sacrificial lock to enable the sacrificial lock to be locked; while the base lock adopts a hinged form: the near-arc-shaped lock head 132 of the male base lock 13 cooperates with the arc groove 141 of the female base lock 14 to form a hinge, and the gap between the lock head 132 and the arc groove 141 is about 0.3 mm (preferably 0.25-0.35 mm), so that the male base lock 13 can deflect a certain angle in the arc groove 141 (single-sided deflection can reach 12°). In order to accommodate the deflection capability of the male base lock 13, the groove edges 1411 on both sides of the female base lock 14 are arc transitioned (arc transition radius 0.3-0.9 mm), and there is a certain gap between them and the surface of the profile body 1 on both sides of the root of the male base lock 13. The groove edges 1411 on both sides of the female foundation lock 14 protrude from the first surface 15 between the female sacrificial lock and the female foundation lock 14. There is a first gap 3 between the first surface 15 and the second surface 16 of the lock profile. There is a second gap 4 between the top of the groove edge 1411 and the second surface 16 of the lock profile. The second gap 4 is smaller than the first gap 3. Therefore, the steel wire 2 is not easy to slide towards the second gap 4 and get stuck in it. Moreover, the groove edge 1411 has an arc transition. In this way, when the pipe deforms, the lock head 132 of the male foundation lock 13 rotates in the arc groove 141 of the female foundation lock 14, and the profile body 1 can deform towards the first gap 3. If the profile bodies 1 of the profiles that are interlocked at the first gap 3 are close together, the deformation will be more difficult, and it will be easier to crush and break at this point.

[0057] Through the above design, when the pipe bends or deforms, causing the profile body 1 to deform and the male base lock 13 to deflect in the arc groove 141 of the female base lock 14: the lock head 132 of the male base lock 13 can rotate more flexibly in the arc groove 141, the groove edges 1411 on both sides of the female base lock 14 have a smooth transition, and the root of the connecting part 131 of the male base lock 13 can slide around the groove edge 1411 of the female base lock 14. This avoids large compression between the male and female base locks 14 at the groove edge 1411 position (A1 position) of the female base lock 14, which would cause the local material to be crushed and damaged due to excessive extrusion pressure. It also avoids large extrusion between the male and female base locks 14 at the groove edge 1411 position of the female base lock 14 due to pipe deformation, which would generate large reaction force or stress, causing the male and female locks to deform excessively or even disengage.

[0058] like Figure 3 As shown, the female foundation lock 14 has a flat bottom 1412 at the bottom of the groove, and the male foundation lock 13 has a lock head 132 with curved sides at the top. Please refer to the diagram. Figure 4 and Figure 5When the male base lock 13 deflects in the arc groove 141 of the female base lock 14, the arc-shaped part on the side of the top of the male base lock 13 will reduce the gap with the flat bottom 1412 to the point of contact (position A3) or even generate a certain amount of compression. The connecting part 131 of the male base lock 13 will also reduce the gap with the groove edge 1411 of the female base lock 14 to the point of contact (position A2) or even generate a certain amount of compression. In this way, a sealed cavity is formed between the two compression positions. The two compression positions have a sealing effect. The sealed cavity is filled with sealant, which also has a sealing effect. This ensures the sealing of the profile lock at the bending deformation position.

[0059] Please refer to Figures 1 to 3 Corresponding to the above-mentioned profile for trenchless pipeline repair, this utility model also provides a profile locking structure for trenchless pipeline repair, including a first profile and a second profile spirally wound and locked together. Both the first profile and the second profile adopt the profile for trenchless pipeline repair described above. The male base lock 13 of the first profile is locked with the female base lock 14 of the second profile, and the female sacrificial lock 1211 of the first profile is locked with the female sacrificial lock of the second profile. When the middle surfaces of the male base lock 13 and the female base lock 14 are aligned, there is a first gap 3 between the first surface 15 and the second surface 16, and a second gap 4 between the lock head 132 and the arc groove 141.

[0060] The profile for trenchless pipeline repair involved in this utility model, through its ingenious design, allows the male foundation locking buckle 13 to rotate flexibly within the arc groove 141 of the female foundation locking buckle 14 while providing a good sealing effect. Please refer to [reference needed]. Figure 4 and Figure 5The male base lock 13 can be deflected in the arc groove 141 of the female base lock 14 so that the arc groove 141 and the lock head 132 are on the same side of the arc groove 141, and the top of the second arc portion 1413 of the arc groove 141 abuts against the first surface 15 at position A1, the connecting portion 131 of the lock head 132 abuts against the inner edge of the second arc portion 1413 of the arc groove 141 at position A2, and the first arc portion 1321 of the lock head 132 abuts against the flat bottom 1412 of the arc groove 141 at position A3, thereby forming a first sealant cavity between A1 and A2, and a second sealant cavity between A2 and A3. Thus, when the pipe bends, as the locking head 132 of the male foundation locking buckle 13 rotates in the arc groove 141 of the female foundation locking buckle 14, the sealant can be stored in the first and second sealant cavities and is not easily squeezed out to the outside of the arc groove 141, resulting in insufficient sealant between the male foundation locking buckle 13 and the female foundation locking buckle 14, leading to poor sealing. The deflection angle C1 of the male foundation locking buckle 13 in the arc groove 141 of the female foundation locking buckle 14 ranges from 0 to 12°, exhibiting strong bending deformation capability. Theoretically, the pipe bending angle made of the profile for trenchless pipe repair of this utility model can reach 12°, which is mainly due to the shape design between the male foundation locking buckle 13 and the female foundation locking buckle 14.

[0061] Corresponding to the above-mentioned profile for trenchless pipeline repair, this utility model also provides a trenchless repair pipeline, which is made by spiral winding of the profile for trenchless pipeline repair described in the above technical solution. This pipeline is a spiral expansion pipeline 5.

[0062] The trenchless repair pipe made of the profile of this utility model has strong deformation ability, can adapt well to the structure of the original pipe, fits the original pipe well, especially can adapt well to the original pipe with bends, curves or misaligned joints, as well as old pipes with poor geometric integrity. When the spiral pipe made of the profile is bent, the base lock is not easy to disengage, break or cause the sealant to be damaged or insufficient, resulting in poor sealing defects.

[0063] The profiles used in this utility model for trenchless pipeline repair can be made of narrower profiles, which allows for a smaller helix angle. Please refer to [reference needed]. Figure 6 The helix angle is defined as follows: the complementary angle between the projection of the profile winding line onto the midpoint of the wound pipe and the pipe axis is defined as the helix angle C2. The range of the helix angle C2 of the pipe manufactured by the profile of this utility model is 2°-6.3°, which can be rounded to 2°-6.5°. Specifically:

[0064] The profile width is 45-55 mm, and the diameter of the pipe made by spiral winding the profile is 130-250 mm. The helix angle C2 ranges from 5.3° to 6.26°, which can be rounded to 5° to 6.5°. The preferred profile width is 51 mm. For pipes with an outer diameter of 150-250 mm, the preferred design width is 51 mm, and the profile thickness is approximately 1.5-2 mm.

[0065] The technical solution of this utility model can control the helix angle by controlling the width of the profile used for winding the pipe, so that the helix angle is smaller. The pipe wound with the improved profile has a smaller helix angle. The smaller helix angle makes the profile easier to expand and fit tightly with the original pipe, which can adapt to pipes with bends, curves or serious joint misalignment. Moreover, the smaller helix angle results in less internal stress in the pipe, making it less prone to slippage and displacement. The sealant in the sealing groove of the main locking of the profile will not be damaged and separated, resulting in gaps and good pipe sealing.

[0066] For narrower profiles with the same pipe diameter, the spiral angle of the spiral winding is smaller, and the single-turn torsional force (i.e., expansion torque, which is also equal to the resistance force) is reduced. Thus, when winding the profile, the torsional resistance of the profile is smaller, the profile is not easily damaged by twisting, the quality of the wound pipe is higher, and in particular, the locking of the profile is not easily damaged by twisting, resulting in better sealing performance of the wound pipe.

[0067] Furthermore, the profile has low torsional resistance, making tension easy to control during construction and making the winding process smoother and easier. It requires fewer personnel to guide the profile, reducing the workload for operators. Table 1 lists the range of helix angle and expansion torque for several specifications of the profile involved in this invention when winding pipes of different outer diameters; the expansion torque is consistently low.

[0068] Table 1. Profile Expansion Torque Test

[0069]

[0070] Moreover, the smaller size of the profiles allows for more uniform material distribution across the entire cross-section during manufacturing, eliminating defects such as bubbles or uneven cooling, thus ensuring the overall quality of the profiles. The finished pipes exhibit greater smoothness in appearance and flatness in their inner walls.

[0071] like Figure 7 As shown, the bending angle is the included angle C3 between the axes of the two pipe segments at the bend. Theoretically, the bending angle of the trenchless repair pipe made of the profile of this utility model for trenchless pipe repair can reach 12°. This is mainly due to the shape design between the male foundation lock 13 and the female foundation lock 14, which allows the male foundation lock 13 to deflect at a certain angle in the arc groove 141 of the female foundation lock 14.

[0072] For the two width specifications of profiles in Table 1 above, the 50 mm width profile has the smallest helix angle and the best expansion compliance, making it especially suitable for pipe repairs below 250 mm. Within this pipe diameter range, old pipes often have small bending radii and large geometric deformations, and the 50 mm profile can better follow the deformation and maintain a seal.

[0073] The profile, locking structure, and pipe involved in this utility model for trenchless pipe repair give the pipe strong bending ability and adaptability to the original pipe wall structure, and have the following main advantages:

[0074] 1. For cages of the same diameter, a smaller helical angle results in lower torsional resistance of the profile, making winding easier. Narrower profiles, with the same pipe diameter, require an even smaller helical winding angle, reducing the torsional torque per turn. This further minimizes torsional resistance during winding, reducing the profile's risk of damage and resulting in higher-quality pipes. In particular, the locking mechanisms are less prone to damage, leading to better pipe sealing. Furthermore, lower torsional resistance makes tension control easier during construction, making winding smoother and requiring less manpower to guide the profile, thus reducing the workload for operators.

[0075] 2. The profile has a small helix angle, making it easier to expand and fit tightly to the original pipe. This allows it to adapt to pipes with bends, curves, or severe joint misalignment, as well as older pipes with uncertain geometric integrity. When the pipe is bent, the locking mechanism is less likely to be damaged or disengaged, or to create gaps in the sealant leading to poor sealing. The small helix angle also reduces resistance during expansion, making it easier for the profile to radially deform according to the geometry of the pipe being repaired. Even if the shape of the pipe is irregular, it can still fit tightly against the inner wall. It can fit tightly against older pipes with bends, curves, or misaligned joints, making it particularly suitable for repair scenarios with poor geometric integrity (pipe inner wall gradient (taper, step) not exceeding 10%). At pipe bends, the smaller the spiral of the pipe profile and the smaller the pipe pitch (more profile sections for a given pipe length), the greater the deformation and bending capacity of the interlocking joints between adjacent profiles. The smaller the pipe pitch, the stronger the bending capacity (bending angles can reach over 5°), and the wider the pipe bend range. The pipe also has a stronger ability to adapt to soil settlement, making it less prone to disengagement of adjacent profile connections due to soil settlement. This also reduces stress concentration at pipe bends, making it less likely for the interlocking joints to detach and the sealant to crack and create gaps, thus ensuring continuous sealing.

[0076] 3. A smaller helix angle results in lower internal stress in the pipe, reducing the likelihood of slippage and displacement. The sealant in the sealing groove of the main locking clip will not be damaged or separated, preventing gaps and ensuring good pipe sealing. The narrow band and small helix angle further reduce internal stress after molding. After pipe expansion and sizing, the male and female locking clips of the profile are less prone to slippage due to internal stress. This prevents the sealant between the male and female locking clips from being damaged, creating gaps that could affect the seal. The helical rings are less prone to slippage or displacement, maintaining overall pipe structural stability. The locking clips are less likely to slip or move due to internal stress, ensuring uniform stress distribution in the sealing groove of the main locking clip. The sealant remains compacted, preventing damage or separation and ensuring long-term stable sealing performance.

[0077] 4. Narrower profiles result in more uniform material distribution during in-plant extrusion, leading to higher profile quality. Smaller cross-sectional dimensions allow for faster cooling during extrusion, reducing internal material stress, improving dimensional stability, and enhancing straightness and dimensional accuracy control. This benefits pipe manufacturing and subsequent expansion. More uniform material distribution across the entire cross-section reduces defects such as bubbles or uneven cooling, ensuring overall profile quality. The finished pipe exhibits greater roundness and smoothness of the inner wall.

[0078] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0079] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A profile for trenchless pipeline repair, comprising a profile body, the inner surface of the profile body forming the inner wall of the pipeline, a first side of the profile body having a male sacrificial lock and a male foundation lock, and a second side of the profile body having a female sacrificial lock and a female foundation lock; characterized in that: The male base lock includes a connecting part and a lock head. The connecting part is connected to the outer side of the profile body, and the lock head is connected to the end of the connecting part. The cross-sectional profile of the lock head includes a flat top and first arcuate portions on both sides of the flat top. The female base lock has an arcuate groove for engaging the connecting head. The cross-sectional profile of the arcuate groove includes a flat bottom and second arcuate portions on both sides of the flat bottom. The male base lock has a first surface on both sides, and the female sacrificial lock and the female base lock have a second surface. When the male base lock and the female base lock are engaged, there is a first gap between the first surface and the second surface. The arcuate groove of the female base lock has an arcuate transition groove edge on both sides of the groove edge, and the groove edge protrudes from the second surface.

2. The profile for trenchless pipeline repair according to claim 1, characterized in that: The wall thickness of the base lock of the profile is 1.2-2 mm, and the radius of the arc of the groove edge is 0.3-0.9 mm.

3. The profile for trenchless pipeline repair according to claim 1, characterized in that: The gap between the groove edge of one section of the profile and the second surface of the other section of the profile that engages with it is 0.4-0.6 mm.

4. The profile for trenchless pipeline repair according to claim 1, characterized in that: When the male foundation latch engages with the female foundation latch, there is a second gap between the latch head and the arc groove.

5. The profile for trenchless pipeline repair according to claim 4, characterized in that: The second gap is 0.25-0.35 mm.

6. The profile for trenchless pipeline repair according to claim 1, characterized in that: An auxiliary rib is provided on the side of the male foundation lock away from the male sacrificial lock. When the male foundation lock engages with the female foundation lock, the auxiliary rib presses the female foundation lock toward the male foundation lock.

7. A profile locking structure for trenchless pipeline repair, comprising a first profile and a second profile spirally wound and engaged together, wherein both the first profile and the second profile are the profile for trenchless pipeline repair as described in claim 1, characterized in that, The male base lock of the first profile engages with the female base lock of the second profile, and the male sacrificial lock of the first profile engages with the female sacrificial lock of the second profile; when the center surfaces of the male base lock and the female base lock are aligned, there is a first gap between the first surface and the second surface, and there is a second gap between the lock head and the arc groove.

8. The profile locking structure for trenchless pipeline repair according to claim 7, characterized in that, The male base latch can deflect in the arc groove of the female base latch such that the arc groove and the latch head are on the same side of the arc groove, achieving the following state: the top of the second arc portion of the arc groove abuts against the first surface at position A1, the connecting part of the latch head abuts against the inner edge of the second arc portion of the arc groove at position A2, and the first arc portion of the latch head abuts against the flat bottom of the arc groove at position A3, thereby forming a first sealant cavity between A and A, and a second sealant cavity between A and A.

9. The profile locking structure for trenchless pipeline repair according to claim 8, characterized in that, The deflection angle C1 of the male foundation lock in the arc groove of the female foundation lock ranges from 0 to 12°.

10. A trenchless pipeline repair method, characterized in that, It is made by spiral winding of the profile for trenchless pipeline repair as described in claim 1.

11. The trenchless pipeline repair method according to claim 10, characterized in that, The complementary angle between the projection of the profile winding line onto the midpoint of the winding pipe and the pipe axis is defined as the helix angle C2, which ranges from 2° to 6.5°.

12. The trenchless pipeline repair method according to claim 11, characterized in that, The profile width is 45-55 mm, the diameter of the pipe made by spiral winding of the profile is 130-250 mm, and the spiral angle C2 ranges from 5° to 6.5°.

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