A high pressure water pipeline trenchless repair lining pipe adhesive joint

Abstract

The utility model belongs to pipeline trenchless repair technical field, specifically is a kind of high-pressure water pipeline trenchless repair lining pipe bonding joint, including two section lining pipe body, the butt joint end of lining pipe body is provided with self-adapting bonding joint assembly, self-adapting bonding joint assembly includes butt joint non-woven fabric sleeve, butt joint non-woven fabric sleeve is infiltrated with ultraviolet light curing resin, the both ends of butt joint non-woven fabric sleeve are fixedly provided with ultraviolet light curing epoxy glue.The utility model adopts the non-woven fabric sleeve butt joint of ultraviolet light curing resin impregnation, can be flexibly attached pipeline misalignment and local deformation, automatically fill gap, form high-strength, dense and smooth composite layer after solidification, have good sealing, pressure resistance and fatigue resistance, need not rigid connecting piece, construction is convenient, especially suitable for high-pressure water pipeline trenchless repair.

Description

Technical Field

[0001] This utility model belongs to the field of trenchless pipeline repair technology, specifically a trenchless repair lining pipe bonding joint for high-pressure water transmission pipelines. Background Technology

[0002] As urban underground water supply networks age, trenchless repair technology is widely used for the renewal and maintenance of high-pressure water pipelines due to its advantages such as minimal ground disturbance and short construction period. As one of the mainstream processes, the sealing of the joints and the reliability of the structure directly determine the repair effect and service life. Especially when crossing sensitive areas such as roads and rivers, the butt joints must simultaneously meet the requirements of high water pressure sealing, deformation resistance and rapid construction.

[0003] Existing pipe lining joints mostly use rigid bonding or mechanical connection methods. In actual operation, when the original pipe has misalignment, bending or local deformation, rigid joints are difficult to fit the irregular mating surface, resulting in gaps or stress concentration in the adhesive layer. If the adhesive material has insufficient fluidity, it cannot fully fill uneven areas and is prone to forming leakage channels after curing. Therefore, a utility model is proposed to address the above problems. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes an adhesive joint for non-excavation repair of lining pipes for high-pressure water transmission pipelines.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The non-excavation repair lining pipe bonding joint of this utility model includes two lining pipe bodies. The mating end of the lining pipe body is provided with an adaptive bonding joint assembly. The adaptive bonding joint assembly includes a mating non-woven fabric sleeve. The mating non-woven fabric sleeve is impregnated with ultraviolet curing resin. Both ends of the mating non-woven fabric sleeve are fixedly provided with ultraviolet curing epoxy adhesive. By using the mating non-woven fabric sleeve impregnated with ultraviolet curing resin for mating, it adapts to the misalignment and local deformation of the pipeline.

[0006] Preferably, the mating end of the inner lining tube body is provided with an inclined bevel, and two stainless steel arc-shaped clamps are movably fitted on the outer side of the mating non-woven sleeve.

[0007] Preferably, the stainless steel arc-shaped clamp is fixedly provided with a butt plate at both ends, and a plurality of bolt holes penetrating the butt plate are provided on one side of the butt plate.

[0008] Preferably, the mating end of the inner liner tube body is provided with an annular placement groove, and an elastic sealing ring is movably disposed inside the annular placement groove.

[0009] Preferably, the mating end of the inner liner tube body is provided with several anti-slip textures.

[0010] Preferably, the elastic sealing ring has several anti-slip protrusions on the side near the docking nonwoven sleeve.

[0011] The beneficial effects of this utility model are: 1. This utility model uses a non-woven fabric sleeve impregnated with UV-cured resin for butt jointing, which can effectively adapt to misalignment and local deformation of pipelines. The non-woven fabric sleeve has excellent flexibility and fit, and can naturally deform with the irregular contour of the pipeline butt joint surface, avoiding bonding failure caused by misalignment or ellipticity deviation. The uncured resin has good fluidity, can automatically fill gaps and penetrate into the microstructure of the pipe surface. After UV irradiation, it forms a continuous, dense and thickness-adaptive composite layer. The cured resin and fiber substrate are combined to form a high-strength flexible whole with good tensile, impact and fatigue resistance, and can withstand dynamic loads such as water hammer and temperature changes without cracking.

[0012] 2. The structure of this utility model forms a smooth transition flow channel on the inner wall, which does not produce steps or turbulence, reduces hydraulic loss, and the entire joint does not require rigid connecting parts, making construction simple. It is particularly suitable for the rapid and reliable repair of high-pressure water pipelines under trenchless conditions. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a three-dimensional view of the overall structure of this utility model; Figure 2 This is a three-dimensional cross-sectional view of the adaptive adhesive joint assembly structure in this utility model; Figure 3 This is a perspective view of the annular placement groove structure in this utility model; Figure 4 This is an enlarged schematic diagram of the structure at point A of this utility model.

[0014] Legend: 1. Inner liner tube body; 2. Adaptive adhesive joint assembly; 201. Butt joint non-woven sleeve; 202. UV-cured resin; 203. UV-cured epoxy adhesive; 204. Inclined bevel; 205. Stainless steel arc clamp; 206. Butt plate; 207. Annular placement groove; 208. Elastic sealing ring; 209. Anti-slip texture; 210. Anti-slip protrusion; 211. Bolt hole. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0016] Specific implementation examples are given below.

[0017] Please see Figures 1-4 This utility model provides a non-excavation repair adhesive joint for lining pipes of high-pressure water pipelines, including two opposing lining pipe bodies 1. The butt joint ends of the two lining pipe bodies 1 are connected by an adaptive adhesive joint assembly 2 to form an integral sealing structure. The lining pipe bodies 1 are made of high-density polyethylene or modified epoxy resin composite material, which has good pressure resistance and chemical stability. An inclined bevel 204 is processed on the outer periphery of the butt joint end of each lining pipe body 1 to increase the adhesive contact area and guide the UV-cured resin 202 to flow evenly and fill the gap.

[0018] An adaptive adhesive joint assembly 2 is fitted outside the annular gap formed after the two inner liner tube bodies 1 are joined. The assembly 2 includes a non-woven fabric sleeve 201 for joining. The sleeve is made of polyester non-woven fabric with high air permeability and high tensile strength. Its length is slightly greater than the total width of the joining area of ​​the two tube ends. The non-woven fabric sleeve 201 for joining is pre-impregnated with ultraviolet light curing resin 202. The resin is an acrylic photosensitive resin with low viscosity, high permeability and fast curing characteristics.

[0019] Furthermore, a ring of UV-curable epoxy adhesive 203 is coated on the inner sides of both ends of the nonwoven sleeve 201 to seal the interface between the sleeve and the inner liner tube body 1 and prevent water from seeping in axially. At the construction site, after the resin-impregnated nonwoven sleeve 201 is placed on the joint area of ​​the two sections of the inner liner tube body 1, an insert-type UV light source is used to irradiate from inside the pipe to cure the UV-curable resin 202 and UV-curable epoxy adhesive 203, forming a high-strength, high-sealing composite adhesive layer.

[0020] To enhance the mechanical stability of the joint, two stainless steel arc-shaped clamps 205 are movably fitted on the outside of the nonwoven sleeve 201. The stainless steel arc-shaped clamps 205 are semi-circular, and their inner diameter matches the outer diameter of the inner liner tube body 1. They are made of 304 or 316 stainless steel and have excellent corrosion resistance. Each stainless steel arc-shaped clamp 205 is fixedly connected to a docking plate 206 at both ends. The docking plate 206 has several through bolt holes 211. During installation, the two clamps are aligned and wrapped around the outside of the joint. Bolts are passed through the bolt holes 211 and tightened to apply uniform radial pressure to the nonwoven sleeve 201, ensuring that the joint is aligned and preventing misalignment before the resin cures.

[0021] In addition, an annular placement groove 207 is provided on the inner wall of the mating end of the inner liner tube body 1. The groove is located inside the bevel 204. An elastic sealing ring 208 is embedded in the annular placement groove 207. The sealing ring is made of EPDM rubber or fluororubber and has excellent compression resilience and water resistance. Several anti-slip protrusions 210 are integrally formed on the side surface of the elastic sealing ring 208 near the mating non-woven sleeve 201. The anti-slip protrusions 210 are hemispherical or frustoconical and are used to increase the frictional resistance between the anti-slip protrusions and the cured resin layer to prevent axial displacement under high water pressure. At the same time, several anti-slip textures 209 are also processed on the outer surface of the mating end of the inner liner tube body 1. The anti-slip textures 209 can be annular grooves, oblique grooves, or dot matrix protrusions to further enhance the mechanical interlocking force between the inner liner tube body 1 and the UV-cured epoxy adhesive 203 and resin layer, and improve the overall bonding strength.

[0022] In the actual trenchless repair process, the original water pipeline section to be repaired is first cleaned with high-pressure water jet and dried to ensure that the pipe wall is free of oil, rust and loose deposits. Then, two prefabricated inner liner pipe bodies 1 are sent into the pipeline to be repaired from the upstream and downstream working wells by traction or pushing, and their joint ends are precisely aligned in the predetermined position, leaving an axial gap to accommodate the adhesive material and adapt to thermal expansion and contraction. Next, an elastic sealing ring 208 is embedded in the annular placement groove 207 on the inner side of the joint end of each inner liner pipe body 1. Before installation, a small amount of lubricant can be applied to the elastic sealing ring 208 to facilitate its smooth sliding into the groove. After installation, it adheres tightly to the groove wall by its own elasticity, forming the first radial sealing barrier. The side of the elastic sealing ring 208 near the joint surface is provided with several anti-slip protrusions 210 to effectively prevent rotation or axial movement under subsequent resin injection or water pressure.

[0023] Subsequently, the nonwoven fabric sleeve 201, which has been pre-impregnated with UV-cured resin 202 at the factory or on-site, is inserted from one end into one section of the inner liner tube body 1 and slid axially to cover the entire docking area. The nonwoven fabric sleeve 201 ensures complete coverage of the bevel 204 and adjacent pipe sections. The resin content of the sleeve after impregnation is controlled to ensure sufficient wetting while avoiding dripping. After the nonwoven fabric sleeve 201 is in place, a ring of UV-cured epoxy adhesive 203 is applied at the junction of its two ends and the outer wall of the inner liner tube body 1 using a special glue gun. This epoxy adhesive 203 not only fills the micro gaps but also forms a chemical-mechanical composite bond with the nonwoven fabric fibers and the tube surface, forming a second sealing line and significantly improving the joint's shear and peel resistance.

[0024] Next, two stainless steel arc-shaped clamps 205 are symmetrically installed on the outside of the positioned non-woven sleeve 201. Each clamp consists of two semi-circular arc units, with the inner surface conforming to the outer diameter of the inner liner tube and the outer side welded with a butt plate 206 with bolt holes 211. During installation, the clamp half-ring is first placed on both sides of the joint, and then high-strength stainless steel bolts are passed through the bolt holes 211 on the butt plate 206 for tightening. The tightening torque is controlled so that the clamps apply uniform radial pressure to the non-woven sleeve 201, which on the one hand removes air bubbles and compacts the resin layer, and on the other hand maintains the geometric stability of the joint during the curing process, preventing misalignment due to gravity or water flow disturbance.

[0025] Finally, the retractable UV curing lamp assembly is sent into the pipeline using a traction rope or a self-propelled trolley, precisely positioned in the center area of ​​the joint, and the light source is turned on. The lamp is then irradiated in segments according to a preset program: first, a low-power pre-irradiation for 1-2 minutes for initial shaping, followed by a high-power main irradiation for 5-8 minutes to complete deep curing. The UV light can penetrate the non-woven fabric fibers, causing the internal resin and epoxy adhesive to cross-link and cure simultaneously, forming a dense, high-strength composite adhesive structure. After curing, the light source equipment is removed, and the stainless steel arc clamp 205 is removed or retained as a permanent reinforcement. The joint formed by the above process has excellent mechanical and sealing properties. The entire construction process does not require road excavation, and the operation time for a single joint is controlled within 30 minutes, significantly improving the efficiency of urban underground pipeline repair. It is particularly suitable for trenchless repair projects of high-pressure water pipelines in busy traffic areas, crossing rivers, or under important infrastructure.

[0026] This invention utilizes a nonwoven fabric sleeve 201 impregnated with UV-cured resin 202 for butt jointing, which significantly improves the adaptability and reliability of the joint under complex working conditions. Specifically, this is reflected in the following aspects: First, the nonwoven fabric sleeve 201 is made of polyester or glass fiber nonwoven fabric with high flexibility and high porosity. It has good extensibility and deformability. When there is axial misalignment between the two inner liner pipe bodies 1 or local ellipticity deviation due to deformation of the original pipe, the sleeve can conform to the irregular butt joint area surface, avoiding stress concentration or bonding failure caused by geometric mismatch in traditional rigid joints. Especially in trenchless repair, the original pipe often experiences slight displacement due to foundation settlement, external pressure, etc. The nonwoven fabric sleeve 201 can effectively "enclose" such defects and achieve a seamless transition.

[0027] Secondly, the UV-curable resin 202 is a low-viscosity liquid before curing, with excellent fluidity and permeability. It can fully wet the gaps between non-woven fabric fibers and penetrate into the micropores and anti-slip textures 209 on the surface of the inner liner tube body 1. When the sleeve is wrapped around the docking end with height difference or angle deflection, the resin automatically flows to the low-lying area under gravity and capillary action to fill the gaps, thereby forming a continuous, dense and thickness-adaptive composite layer after curing.

[0028] Furthermore, the polymer matrix formed by the UV-curable resin 202 after curing and the non-woven fibers constitute a three-dimensional interpenetrating network structure, which has both high tensile strength and a certain elongation at break, giving the joint good impact resistance and fatigue resistance. When the water pipeline is subjected to water hammer pressure fluctuations or temperature cycle loads for a long time, this composite layer can absorb energy through micro-deformation to prevent brittle cracking, which is significantly better than rigid bonding methods such as pure epoxy glue or hot melt glue.

[0029] Furthermore, since the non-woven sleeve 201 completely wraps around the docking area, its outer surface forms a smooth and continuous flow channel after curing, which will not produce steps or protrusions on the inner wall of the pipe, effectively reducing water flow resistance and avoiding secondary damage caused by eddy current scouring. At the same time, this structure can achieve high-strength connection without additional welding, flanges or mechanical locking parts, simplifying the trenchless construction process and reducing the requirements for operating space and equipment precision.

[0030] By using a non-woven fabric sleeve 201 impregnated with UV-cured resin 202 for docking, not only is adaptive compensation for pipe misalignment and local deformation achieved, but the sealing performance, mechanical strength and long-term service stability of the joint are also improved simultaneously. It is particularly suitable for high-pressure and high-reliability trenchless repair projects of old water supply networks in complex underground environments.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A non-excavation repair adhesive joint for lining pipes of high-pressure water pipelines, comprising two sections of lining pipe body (1), characterized in that: The inner liner tube body (1) is provided with an adaptive adhesive joint assembly (2) at the docking end. The adaptive adhesive joint assembly (2) includes a docking nonwoven sleeve (201). The docking nonwoven sleeve (201) is impregnated with ultraviolet light-curing resin (202). Both ends of the docking nonwoven sleeve (201) are fixedly provided with ultraviolet light-curing epoxy adhesive (203). By using the docking nonwoven sleeve (201) impregnated with ultraviolet light-curing resin (202) for docking, the misalignment and local deformation of the pipe are adaptively addressed.

2. The adhesive joint for trenchless repair of lining pipes in high-pressure water transmission pipelines according to claim 1, characterized in that: The inner lining tube body (1) has an inclined bevel (204) at the docking end, and two stainless steel arc-shaped clamps (205) are movably fitted on the outer side of the docking nonwoven sleeve (201).

3. The adhesive joint for trenchless repair of lining pipes in high-pressure water transmission pipelines according to claim 2, characterized in that: The stainless steel arc-shaped clamp (205) has a butt plate (206) fixedly installed at both ends, and a number of bolt holes (211) through the butt plate (206) are opened on one side of the butt plate (206).

4. The adhesive joint for trenchless repair of lining pipes in high-pressure water transmission pipelines according to claim 3, characterized in that: The inner liner tube body (1) has an annular placement groove (207) at the docking end, and an elastic sealing ring (208) is movably arranged inside the annular placement groove (207).

5. The adhesive joint for trenchless repair of lining pipes in high-pressure water transmission pipelines according to claim 4, characterized in that: The inner liner tube body (1) has several anti-slip grooves (209) at the docking end.

6. The adhesive joint for trenchless repair of lining pipes in high-pressure water transmission pipelines according to claim 5, characterized in that: The elastic sealing ring (208) has several anti-slip protrusions (210) on the side near the docking non-woven sleeve (201).

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