KR101482835B1 - High Strength Multy―Liner For Revival Water Supply Pipe - Google Patents

Abstract

The present invention relates to a high strength composite liner for use in a non-drilling method for repairing various piping facilities. According to the present invention, the longitudinal and transverse expansion of the entire liner is suppressed to reduce the thickness variation of the liner, It is possible to provide a high strength composite liner for rehabilitating a water supply and sewage pipe having an effect of minimizing the generation of water and eliminating leaking phenomenon when water pressure is applied.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high strength multi-

The present invention relates to a high strength composite liner for rehabilitating a sewer pipe used in a non-drilling method for repairing various pipe facilities.

The upper sewer pipe increases sewage inflow, subsidence, water quality and soil pollution due to the decrease of strength of pipe, failure of joints, cracks, breakage, corrosion, wear and relaxation due to long-term use. And a phenomenon occurs, which causes a bad odor. In addition, there may be a phenomenon of water disturbance due to the infiltration of the roadside roots into the sewer pipe and the protrusion of the connection pipe such as the household sewage pipe.

The amount of water leaking from such old water pipes is about 1 billion tons per year in Korea, which accounts for 18% of the total output of 5.8 billion tons. In terms of amount, about 500 billion won per year of water leaks into the ground. The production cost of tap water is also rapidly increasing from about 280 won / ㎥ in the late 1990s to about 550 won / ㎥ at present, and it is necessary to use a lot of energy for tap water production. Considering the reality of our energy importing country, It is very important to distribute cleanly.

In order to prevent and overcome such a situation, a pipeline improvement project, namely pipe replacement and rehabilitation project, is underway, but as a measure to secure the stability of the water supply and drainage pipe, a water supply and drainage pipe has been drilled after a certain period of time, . The replacement of the old building has to be constructed by excavating the road, which has the disadvantage of high social overhead due to traffic congestion, dust, noise and waste generated during the construction.

In recent years, it has been removed from these new pipe replacement methods to reduce the cost of construction and construction, and to minimize the waste of other social overhead costs by adopting a non-excavation method that rehabilitates various old channel facilities without excavation of road surface. The construction using liners which are various functional fiber structures has been greatly expanded.

In this way, it is possible to repair and repair the wastewater with a construction cost of about 50 ~ 70% compared to the existing excavation method for repairing water and sewage water. Thus, a liner is used in the unreachable construction method of economical and efficient value. It is a type of composite fiber product used for maintenance of sewage and sewage pipes in order to prevent enormous resource loss and energy loss caused by tap water leakage caused by corrosion and breakage due to long-term use and contamination of tap water caused by external groundwater inflow.

In the meantime, the above-mentioned liner product has been used by applying urethane coating to inorganic fibers such as rock surface and glass surface, which are inorganic materials, but these materials have disadvantages in that they are weak in moisture and have excellent flame retardancy and heat resistance. There has been a problem in that leakage occurs when a water pressure is applied due to a deviation and expansion in a longitudinal direction and a lot of wrinkles are generated due to shrinkage and expansion.

Accordingly, Korean Utility Model Registration No. 20-0367651 discloses a repair felt used in a non-drilling repairing method in which a plate is formed in a cylindrical shape, A cover having one side of the woven fabric coated with a synthetic resin; And an inner skin reinforced with a woven fabric on the nonwoven fabric, wherein the outer skin is laminated on the inner surface of the outer skin, and the inner skin is reinforced with a nonwoven fabric. Which can withstand various reversing pressures and curing temperatures according to the present invention, as well as excellent mechanical properties after curing, thereby providing a liner that can meet the strength reinforcement level required for repairing the sewage pipe.

However, in the above-mentioned prior art, the water pressure and the load which are to be endured with a larger diameter are increased during the regeneration of the long-diameter or large-diameter large-diameter pipe. In the case of the liner having a low tensile strength, the liner is frequently ruptured. And the durability is deteriorated. Therefore, it is difficult to use as a high-strength liner for large diameter tolerance.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a high strength composite liner for rehabilitating a water supply and sewage pipe capable of solving the problems of rupture, sagging, and durability deterioration of a large diameter tolerance liner.

Therefore, When a high-strength, high-definition woven fabric layer is laminated together with a nonwoven fabric, the longitudinal and transverse expansion of the entire liner is suppressed to reduce the thickness variation of the liner and minimize the occurrence of wrinkles. So that the present invention has been completed.

Thus, according to the present invention, there is provided an overcoat film layer comprising ethylene vinyl acetate or polyethylene;

A woven fabric layer made of synthetic fibers and laminated on the back surface of the upper film layer;

An intermediate film layer made of ethylene vinyl acetate or polyethylene and laminated on the back surface of the woven fabric layer; And

And a nonwoven fabric layer made of a polyethylene fiber or a polyester fiber, the nonwoven fabric layer being laminated on the back surface of the intermediate layer film layer and contacting the inner surface of the pipe. The high strength composite liner for regenerating a water supply pipe is provided.

Further, the high strength composite liner for regenerating a sewer pipe of the present invention is characterized in that a woven fabric layer and a nonwoven fabric layer are further laminated on the back surface of the nonwoven fabric layer.

In the high-strength composite liner for regenerating a sewer piping according to the present invention, the woven fabric layer is formed by supplying a separate yarn on a mesh structure composed of warp and weft yarns to form a warp yarn so that the loops pass through the intersection of warp and weft yarns And is a woven fabric layer.

Also, in the high strength composite liner for regenerating sewage pipes of the present invention, the warp layer has an MD strength of 170 to 200 N, an MD elongation of 36 to 40%, a CD strength of 120 to 150 N, and a CD elongation of 45 to 60%.

Therefore, according to the present invention, when the composite fabric layer is laminated together with the nonwoven fabric, the longitudinal and transverse expansion of the entire liner is suppressed to reduce the thickness variation of the liner and minimize the occurrence of wrinkles, The present invention can provide a high strength composite liner for rehabilitating a sewer pipe.

1 is a schematic cross-sectional view of one embodiment of a high strength composite liner for regenerating a water supply and drainage pipe of the present invention,
2 is a schematic cross-sectional view of an embodiment of a high strength composite liner for regenerating a sewer pipe of the present invention,
3 is a cross-sectional schematic diagram of an example of the use of a high strength composite liner for regenerating a sewer pipe of the present invention,
4 is a plan view of a woven material layer as a component of a high strength composite liner for regenerating a sewer pipe of the present invention,
5 is an enlarged photograph of a flat photograph of a woven layer as a component of the high strength composite liner for regenerating a sewer pipe of the present invention.

Hereinafter, the high strength composite liner for regenerating the water supply and sewage pipe of the present invention will be described in detail.

The high strength composite liner for regenerating a water pipe of the present invention is formed by laminating an upper film layer 1, a woven fabric layer 2, an intermediate film layer 3 and a nonwoven fabric layer 4 as shown in Fig. An upper film layer (1) made of ethylene vinyl acetate or polyethylene; A woven fabric layer (2) made of synthetic fibers and laminated on the back surface of the upper film layer; An intermediate film layer (3) made of ethylene vinyl acetate or polyethylene and laminated on the back surface of said woven fabric layer; And a nonwoven fabric layer made of any one of polyethylene fibers and polyester fibers laminated on the back surface of the intermediate layer film layer so as to be in contact with the inner surface of the pipe.

As shown in FIG. 3, the high-strength composite liner for regenerating the water supply and sewage pipe is formed into a cylindrical tube by joining both ends without facing each other. An epoxy adhesive is applied to the nonwoven fabric layer 4 which is inserted into the pipe for maintenance and repair and is brought into contact with the cylindrical inner wall of the pipe to reinforce the pipe by adhering to the cylindrical inner wall of the pipe. At this time, the gas is blown into the inside of the cylindrical liner and expanded, and it is brought into close contact with the inner surface of the pipe.

In the present invention, the upper film layer (1) is made of ethylene vinyl acetate (EVA) or polyethylene and is located on the innermost surface when used as a liner. When the liner is installed on the inner wall of the pipe, the upper film layer 1 located on the radially innermost surface of the liner is exposed to water and other materials flowing through the pipe, Should be used.

In the present invention, the woven fabric layer (2) laminated on the back surface of the upper layer film layer is made of a synthetic fiber yarn. Preferably, a separate yarn is fed on a mesh structure composed of warp and weft yarns, And a warp yarn is formed so that the loop passes through the intersection.

In the prior art, a general mesh type fabric has been used, but the strength in the warp direction and the warp direction is not only weak, but also when applied to the liner and expanded by air, the longitudinal and transverse expansion to the cut surface of the liner is uneven, Wrinkles often occur.

In the present invention, as shown in FIG. 3, a separate yarn 30 is supplied on a mesh structure composed of a warp yarn 10 and a weft yarn 20 to form a warp yarn, It is possible not only to reinforce the strength in the warp direction and the warp direction by using the warp knitting yarn but also to have the sufficient elasticity when the warp knitted fabric is expanded by the loops of the warp knitting yarn so that the stretching force of the entire liner is excellent, So that the strength and elongation of the entire liner can be reinforced while the thickness variation of the liner can be reduced and the occurrence of wrinkles can be minimized.

In the high strength composite liner of the present invention, the knitted fabric layer has a MD (Machine Direction) strength of 170 to 200 N, an MD elongation of 36 to 40%, a CD (Cross Direction) strength of 120 to 150 N, %, Which is excellent in tensile strength and elongation in the longitudinal and transverse directions, and is good for the elongation and strength reinforcement of the entire liner.

The middle layer film layer 3 laminated on the back surface of the woven fabric layer 2 is made of ethylene vinyl acetate or polyethylene and acts to prevent leaking of water in the lining.

The nonwoven fabric layer 4 laminated on the back surface of the middle layer film layer 3 is made of a nonwoven fabric made of polyethylene or polyester fibers. When the nonwoven fabric layer 4 is laminated on the back surface of the middle layer film layer and used as a liner, And its surface is bonded to the inner wall which is the innermost surface in the radial direction of the pipe by an adhesive such as an epoxy resin. The nonwoven fabric mainly uses needle punching nonwoven fabric and functions to adjust the thickness of the liner.

Further, the high strength composite liner for regenerating the sewer pipe of the present invention may further laminate the nonwoven fabric layer and the woven fabric layer on the back surface of the nonwoven fabric layer, and can reinforce the strength and elongation.

Thus, in the present invention, when a high-strength composite liner is manufactured by laminating a woven fabric layer having a composite structure of a film layer, a high strength and a high expansion ratio together with a nonwoven fabric, the longitudinal expansion of the entire liner is suppressed, It is possible to minimize the occurrence of wrinkles and to eliminate the phenomenon of leaking when the water pressure is applied, thereby solving the problem of rupturing, sagging phenomenon and durability deterioration of the conventional large diameter liner.

The following examples illustrate non-limiting examples of a high strength composite liner for regenerating a sewer pipe of the present invention.

[Example 1]

A needle punching nonwoven fabric was produced from polyester staple fibers having an average fiber length of 51 mm as a raw material, and the polyethylene chips were melted and coated on one side of the nonwoven fabric layer, and polyester yarn (PET DTY 300de. (See FIG. 4, MD strength of 180N, MD elongation of 38.7%, CD strength (see FIG. 4), and the like 130N, CD elongation 50.1%, KSK 0521) was laminated on the surface of the nonwoven fabric layer on which the polyethylene film layer was coated, and then the polyethylene chips were melted and coated on the back surface of the woven fabric layer, And extruded to prepare a composite liner.

The physical properties of the prepared composite liner are shown in Table 1 below.

division    Example 1   Remarks (measurement method) Thickness (mm)   12 KSK0566 Weight (g / ㎡)   1500 KSK0514
The tensile strength
(Kg / cm2) MD    45 KSK0520
(machine direction) CD    41 KSK0520
(cross direction)
Tensile elongation
(%) MD    21 KSK0520
(machine direction) CD    23 KSK0520
(cross direction) Abrasion resistance   4th grade KSK0818

1: upper layer film layer 2: woven fabric layer
3: intermediate layer film layer 4: nonwoven layer
10: Slope 20: Weft
30: Warp knitting yarn

Claims (4)

An upper layer film layer made of ethylene vinyl acetate or polyethylene;
A woven fabric layer made of a synthetic fiber yarn and provided with a yarn on a mesh structure composed of warp and weft yarns to form a warp yarn such that a loop passes through an intersection of warp and weft yarns,
An intermediate film layer made of ethylene vinyl acetate or polyethylene and laminated on the back surface of the woven fabric layer; And
And a nonwoven fabric layer made of a polyethylene fiber or a polyester fiber, the nonwoven fabric layer being laminated on the back surface of the intermediate layer film layer and contacting the inner surface of the pipe. The method according to claim 1,
Wherein a woven fabric layer and a nonwoven fabric layer are further laminated on the back surface of the nonwoven fabric layer. delete The method according to claim 1,
Wherein the woven fabric layer has an MD strength of 170 to 200 N, an MD elongation of 36 to 40%, a CD strength of 120 to 150 N, and a CD elongation of 45 to 60%.

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