Non-excavation lining repair polyethylene composite pipe for water supply and preparation method thereof

Abstract

The invention discloses a trenchless lining repair polyethylene composite pipe for water supply and a preparation method thereof, and relates to the field of pipeline repair. The preparation method comprises the following steps: step 1, extruding food-grade polyethylene granules by an extruder, casting to form a film, and compounding the film on the surface of a reinforced polyester knitted felt to form a food-grade polyethylene film layer, so as to prepare an outer-layer composite hose; by utilizing the flexibility, excellent scratch resistance, corrosion resistance and high strength performance of polyethylene (PE), the flexible pipe (the flexible pipe is of a flexible structure before being cured) is fully connected with the inner wall of the repaired pipeline in the repaired pipeline, and pipelines with different shapes such as round, oval, square or special-shaped pipelines and elbows with the angle smaller than or equal to 45 DEG C can be repaired; the medium conveying pipeline is used for drinking water; and the lining pipe has the advantages of corrosion resistance and wear resistance, the material strength is high, the problem of underground water infiltration is thoroughly solved, the sectional area loss of the pipeline is small, the surface is smooth, the water flow friction is reduced, and the flow capacity of the pipeline is improved.

Description

Technical Field

[0001] The invention relates to the field of trenchless pipeline repair, and in particular to a trenchless lining repair polyethylene composite pipe for water supply and a preparation method thereof. Background Art

[0002] Trenchless repair refers to the renewal and repair of underground pipelines by excavating a very small part of the surface. It originated in the UK and has been developed on a large scale in Germany. The application of this technology will not hinder traffic, will not damage green spaces and vegetation, and will not affect the normal life and work order of shops, hospitals, schools and residents. It solves the interference of traditional excavation construction on residents' lives, and the damage and adverse effects on traffic, environment, and foundations of surrounding buildings. The main implementation process is: make a fiber (glass fiber, polyester fiber, etc.) liner pipe, the outer layer (or the inner and outer layers) is coated with a polymer coating (food grade PE), first impregnated with resin (meeting drinking water requirements) material to make the liner pipe to be turned over; then it is turned over by water gravity, air pressure or traction and dragging into the pipeline to be repaired, and all the liner pipes to be turned over are installed in the main pipeline, and the resin material is cured by room temperature curing, heating curing, ultraviolet light curing, etc. After the resin material is cured, the liner pipe impregnated with the resin material is hardened, and a new liner pipe will be formed in the original pipeline.

[0003] At present, some domestic lined hoses have low pressure bearing capacity (non-structural repair), and are unable to repair some pressurized pipes and are easily damaged. Therefore, this trenchless lined repair polyethylene (PE) composite pipe for water supply can be used to repair pressurized water supply pressure pipes, with an independent pressure bearing capacity of not less than 9 kilograms. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a trenchless liner repair polyethylene composite pipe for water supply to solve the technical problems that the liner hose has low pressure bearing capacity (non-structural repair), some pipes working under pressure cannot be repaired, and are easily damaged.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a trenchless lining repair polyethylene composite pipe for water supply, comprising the following steps:

[0006] Step 1: preparing the outer composite hose, extruding the food-grade polyethylene granules through an extruder, casting the granules into a film, and then compounding the granules on the surface of the reinforced polyester knitted felt to form a food-grade polyethylene film layer, thereby making the outer composite hose;

[0007] Step 2: connecting the butt edge of the hose, the butt edge on the polyethylene film layer is a polyethylene film layer seam, the polyethylene film layer seam is connected by sewing, and the sewn polyethylene film layer seam is passed through an extruder through a food-grade polyethylene granular material; the extruded cast film strip is formed by high-temperature hot pressing;

[0008] Step 3, manufacturing outer composite hoses with different diameters according to different operation pipelines;

[0009] Step 4: pull the inner layer polyester filament seamless braided hose into the outer layer composite hose to form the trenchless lining repair polyethylene (PF) composite pipe for water supply.

[0010] By adopting the above technical solution, the flexibility, excellent scratch resistance, corrosion resistance and high strength of polyethylene can enable it (the hose is a flexible structure before solidification) to be fully connected with the inner wall of the repaired pipe in the repair pipe, and can repair elbows with an angle of ≤45° and pipelines of different shapes: round, oval, square or special-shaped pipes.

[0011] Furthermore, the inner layer is a hose formed and woven from polyester filaments in one step, and the diameter is larger than the outer layer composite hose.

[0012] Furthermore, the polyethylene film layer and the reinforced polyester knitted felt constitute the outer composite hose.

[0013] By adopting the above technical scheme, the seams of the polyethylene film layers are connected by sewing, and the food-grade polyethylene granules are passed through the extruder on the seams of the sewn polyethylene film layers; the extruded cast film strips are formed by high-temperature hot pressing, with stronger bonding strength, without any adhesive, and formed in one time, and finally can achieve and complete the best effect of the engineering operation, giving full play to the characteristics of polyethylene (PF) materials.

[0014] Furthermore, it comprises a polyethylene film layer, the other side of the polyethylene film layer is connected to a reinforced polyester knitted felt, one side of the reinforced polyester knitted felt is provided with a polyester filament seamless braided hose, and a polyethylene film layer seam is opened on the polyethylene film layer.

[0015] By adopting the above technical solution, in order to ensure that the new pipeline formed after the engineering operation can reach a certain wall thickness and independent pressure bearing requirements, the independent pressure bearing is not less than 9 kg, and it is conducive to the full permeability of the integral lining hose impregnated with resin before the engineering operation. The purpose of the inner layer of polyester filament seamless braided hose having a diameter greater than the outer layer of composite hose is that after the integral hose is turned over during the engineering operation, the inner wall of the inner layer of polyester filament braided hose is connected to the inner wall of the old pipe at the outer layer.

[0016] Furthermore, the outer surface of the polyester filament seamless braided hose is provided with an old pipe.

[0017] Furthermore, the outer wall of the polyester filament seamless braided hose fits with the inner wall of the old pipe.

[0018] Furthermore, the polyethylene film layer seam extends horizontally along the length direction of the outer composite hose.

[0019] In summary, the present invention mainly has the following beneficial effects:

[0020] The present invention utilizes the flexibility, excellent scratch resistance, corrosion resistance and high strength of polyethylene (PE) to enable it (the hose is a flexible structure before solidification) to be fully connected with the inner wall of the repaired pipe in the repair pipe, and can repair elbow angles ≤45° and pipelines of different shapes: circular, elliptical, square or special-shaped pipes; medium conveying pipelines: drinking water; and the liner pipe has the advantages of corrosion resistance and wear resistance, high material strength, and completely solves the problem of groundwater infiltration. The pipe cross-sectional area loss is small, the surface is smooth, the water flow friction is reduced, and the flow capacity of the pipe is improved. The materials are all environmentally friendly materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of the polyethylene composite pipe material of the present invention;

[0022] Figure 2 This is a cross-sectional view of a pipe before the construction of the polyethylene composite pipe of the present invention;

[0023] Figure 3 This is a cross-sectional view of a pipeline after the polyethylene composite pipe of the present invention is constructed.

[0024] In the figure: 1. Polyethylene film layer seam; 2. Polyethylene film layer; 3. Reinforced polyester knitted felt; 4. Polyester filament seamless braided hose; 5. Old pipe; DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] The following describes an embodiment of the present invention based on its overall structure.

[0027] A method for preparing a trenchless lining repair polyethylene composite pipe for water supply, comprising the following steps:

[0028] Step 1: preparing the outer composite hose, extruding the food-grade polyethylene PF granules through an extruder, casting the granules into a film, and then compounding them on the surface of the reinforced polyester knitted felt 3 to form a food-grade polyethylene film layer 2, thereby making the outer composite hose;

[0029] Step 2: connecting the butt edge of the hose, the butt edge on the polyethylene film layer 2 is the polyethylene film layer seam 1, the polyethylene film layer seam 1 is connected by sewing, and the sewn polyethylene film layer seam 1 is passed through the extruder through the food-grade polyethylene granules; the extruded cast film strip is formed by high-temperature hot pressing;

[0030] Step 3, manufacturing outer composite hoses with different diameters according to different operation pipelines;

[0031] Step 4: pull the inner layer polyester filament seamless braided hose 4 into the outer layer composite hose to form the trenchless lining repair polyethylene (PF) composite pipe for water supply.

[0032] By adopting the above technical solution, the flexibility, excellent scratch resistance, corrosion resistance and high strength of polyethylene PE can enable it (the hose is a flexible structure before solidification) to be fully connected with the inner wall of the repaired pipe in the repair pipe, and can repair elbows with an angle of ≤45° and pipelines of different shapes: round, oval, square or special-shaped pipes.

[0033] As a further feature of the present invention, the inner layer is a hose formed and woven from polyester filaments in one step, and the diameter of the hose is larger than that of the outer layer composite hose.

[0034] As a further development of the present invention, the outer composite hose is composed of a polyethylene film layer 2 and a reinforced polyester knitted felt 3 .

[0035] By adopting the above technical scheme, the polyethylene film layer seams 1 are connected by sewing, and the food-grade polyethylene granular material is passed through the sewn polyethylene film layer seams 1 through an extruder; the extruded cast film strips are formed by high-temperature hot pressing, and have stronger bonding strength, do not contain any adhesives, are formed in one time, and can finally achieve and complete the best effect of the engineering operation, giving full play to the characteristics of polyethylene (PF) materials.

[0036] As a further step of the present invention, it includes a polyethylene film layer 2, the other side of the polyethylene film layer 2 is connected to a reinforced polyester knitted felt 3, one side of the reinforced polyester knitted felt 3 is provided with a polyester filament seamless woven hose 4, and a polyethylene film layer seam 1 is opened on the polyethylene film layer 2.

[0037] By adopting the above technical solution, in order to ensure that the new pipeline formed after the engineering operation can reach a certain wall thickness and independent pressure bearing requirements, the independent pressure bearing is not less than 9 kg, and it is conducive to the full permeability of the integral lining hose impregnated with resin before the engineering operation. The purpose of the inner layer of polyester filament seamless braided hose 4 having a diameter greater than the outer layer of composite hose is that after the integral hose is turned over during the engineering operation, the inner wall of the inner layer of polyester filament braided hose 4 is connected to the inner wall of the old pipe at the outer layer.

[0038] As a further development of the present invention, the outer surface of the polyester filament seamless braided hose 4 is provided with an old pipe 5 .

[0039] As a further feature of the present invention, the outer wall of the polyester filament seamless braided hose 4 is fitted with the inner wall of the old pipe 5 .

[0040] As a further development of the present invention, the polyethylene film layer seam 1 extends horizontally along the length direction of the outer composite hose.

[0041] Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A method for preparing a trenchless lining repair polyethylene composite pipe for water supply, characterized in that: The steps include: Step 1, preparing the outer composite hose, extruding food-grade polyethylene (PE) granules through an extruder, casting into a film, and then compounding it on the surface of a reinforced polyester knitted felt (3) to form a food-grade polyethylene film layer (2), thereby making an outer composite hose; Step 2, connecting the butt edge of the hose, the butt edge on the polyethylene film layer (2) is the polyethylene film layer seam (1), the polyethylene film layer seam (1) is connected by sewing, and the sewn polyethylene film layer seam (1) is passed through a food-grade polyethylene granular material through an extruder; the extruded cast film strip is formed by high-temperature hot pressing; Step 3, manufacturing outer composite hoses with different diameters according to different operation pipelines; Step 4: The inner layer polyester filament seamless braided hose (4) is pulled into the outer layer composite hose to form the trenchless lining repair polyethylene (PE) composite pipe for water supply.

2. The method for preparing a trenchless lining repair polyethylene composite pipe for water supply according to claim 1, characterized in that: The inner layer is a hose woven from polyester filaments in one step, and the diameter is larger than the outer layer composite hose.

3. The method for preparing a trenchless lining repair polyethylene composite pipe for water supply according to claim 1, characterized in that: The polyethylene film layer (2) and the reinforced polyester knitted felt (3) form the outer composite hose.

4. The trenchless lining repair polyethylene composite pipe for water supply according to claim 1, characterized in that: It comprises a polyethylene film layer (2), the other side of the polyethylene film layer (2) is connected to a reinforced polyester knitted felt (3), one side of the reinforced polyester knitted felt (3) is provided with a polyester filament seamless braided hose (4), and a polyethylene film layer seam (1) is opened on the polyethylene film layer (2).

5. The trenchless lining repair polyethylene composite pipe for water supply according to claim 4, characterized in that: An old pipe (5) is provided on the outer surface of the polyester filament seamless braided hose (4).

6. The trenchless lining repair polyethylene composite pipe for water supply according to claim 5, characterized in that: The outer wall of the polyester filament seamless braided hose (4) fits the inner wall of the old pipe (5).

7. The trenchless lining repair polyethylene composite pipe for water supply according to claim 4, characterized in that: The polyethylene film layer seam (1) extends horizontally along the length direction of the outer composite hose.

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