JPH03213326A - Lining material for duct line - Google Patents

Abstract

PURPOSE:To prevent elongation of cylindrical nonwoven fabric from being enlarged by deterioration of strength, to prevent deterioration of resistance to compressibility and to enhance the impregnating ability of an adhesive by superposing nonwoven fabric mainly made of filament having prescribed fineness on the seat material and performing needle punching and utilizing the strengthened nonwoven fabric wherein the seat material and the nonwoven fabric are integrally joined. CONSTITUTION:The cylindrical lining material 1 whose inner face is coated with an adhesive is inserted into a duct line while turning the lining material 1 over by pressure-fluid. When the adhesive is cured while this lining material 1 is contact-bonded to the inner face of the duct line, the lining material 1 is constituted of the cylindrical airtight material 2 and a cylindrical adhesive holding material 3 inserted into the inside thereof. The adhesive holding material 3 is prepared so as to become strengthened nonwoven fabric 8 having 0.14-0.21g/cm<3> bulk density by superposing nonwoven fabric 7 mainly made of synthetic fiber of 6-8d on the seat material 6 wherein the yarnlike material 9 is coarsely arranged in a lattice shape and performing needle punching and integrally joining the seat material 6 to the nonwoven fabric 7. Thereby the lining material sufficiently holds the adhesive and does not excessively squeezed out at a time of lining.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is applicable to pipelines mainly buried underground, such as gas pipes, water pipes, sewer pipes, power lines, communication lines, etc., and oil pipelines. This relates to a lining material for lining a pipe, and in particular, a cylindrical lining material coated with an adhesive on its inner surface is inserted into the pipe while being turned over by pressure fluid, and the lining material is inserted into the pipe line. The present invention relates to a lining material for use in a method for lining pipes in which the adhesive is cured while being pressed onto the inner surface of the pipe by fluid pressure.

By the way, in the above-mentioned lining method, the main focus was once on repairing the damaged part of the pipe, and the lining material was designed to have airtightness and firmly adhere to the inner surface of the pipe to close the damaged part. It was designed with a focus on

However, in recent years, it has become common to line the pipes as described above to strengthen them. In other words, even if the pipe ruptures due to earthquakes, ground subsidence, vibrations from passing vehicles, etc., the lining material will peel off from the pipe without rupturing, preventing internal fluid from leaking, and protecting against external pressure caused by groundwater, etc. There is a need for a lining material that will not be crushed even when

Conventional technology The structure of such a lining material is disclosed in Japanese Patent Application Laid-Open No. 59-22
The one described in Japanese Patent No. 5920 is known.

This product has an airtight film layer as the outermost layer, a strong cylindrical woven fabric layer on the inside thereof, and a cylindrical nonwoven fabric for adding thickness to the inside thereof.

Problems to be Solved by the Invention In this structure, it is necessary to draw the cylindrical nonwoven fabric into the cylindrical woven fabric, so the cylindrical nonwoven fabric is required to have high tensile strength and low elongation. It is preferred to use spunbond nonwoven fabrics.

By the way, commercially available spunbond nonwoven fabrics are
The fineness of the single fibers is as thin as about 2 to 3 d, and by intertwining these thin single fibers with each other, a product with excellent strength and dimensional stability is obtained.

However, in order to use this as the lining material,
It is required to be easily impregnated with adhesive. However, in the above-mentioned general spunbond nonwoven fabric, since thin single fibers are entangled, it is difficult to impregnate the adhesive. Therefore, it takes a long time to satisfactorily impregnate the fiber layer of the lining material with the adhesive, and even then, some parts may not be sufficiently impregnated, making it impossible to form a sufficiently rigid lining layer.

Furthermore, experimental results show that increasing the fineness of the single fibers makes it easier to impregnate the adhesive, but the properties as a spunbond nonwoven fabric are greatly reduced. That is, the strength is reduced, and it becomes easy to stretch under tension, making it difficult to draw the cylindrical nonwoven fabric into the cylindrical woven fabric.

However, when the fineness of the single fiber is small, the compression resistance is poor. The lining material is pressed against the inner surface of the pipe by internal fluid pressure, and the adhesive hardens there to form a rigid lining layer, but if spunbond nonwoven fabric has poor compression resistance,
When pressed against the inner surface of the pipe by fluid pressure, the nonwoven fabric layer is compressed and its thickness is reduced, the resistance of the lining layer to external pressure is reduced, and the impregnated adhesive is squeezed out.

The present invention was made in view of the above circumstances, and it is possible to impregnate the cylindrical nonwoven fabric of the above-mentioned lining material with an adhesive without reducing strength, increasing elongation, or reducing compression resistance. The purpose is to improve sexual performance.

As a means for solving the problems, the present invention provides a method for inserting a cylindrical lining material coated with an adhesive onto the inside of the pipe into the pipe while turning it over with pressure fluid, and pressing the lining material onto the inner surface of the pipe while A lining material used in a pipe lining method for curing adhesive, comprising a cylindrical airtight cylindrical material and a cylindrical adhesive holding material inserted inside the airtight cylindrical material, The adhesive holding material is obtained by overlapping a nonwoven fabric mainly made of 6 to 8 d synthetic fibers on a sheet material made of thread-like materials roughly arranged in a lattice pattern, and then needle-punching the sheet material and the nonwoven fabric into one piece. The apparent density of the bonded product is 0.14 to 0.21g/-
No reinforcement! It is characterized by being made of cloth.

The lining material of the present invention needs to have some flexibility in the circumferential direction when it is pressed against the inner surface of the pipe, so the strength of the sheet material in the circumferential direction of the lining material must be greater than that in the longitudinal direction. It is appropriate to keep it small.

Further, the adhesive holding material is formed by forming the reinforced nonwoven fabric into a cylindrical shape with the sheet material facing outside.
This is preferable because the lining material easily adheres to the inner surface of the pipe.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pipe lining material 1 of the present invention.

The lining material 1 includes an airtight cylindrical material 2 formed by forming an airtight synthetic resin film 5 on the outer surface of a cylindrical woven fabric 4, and a cylindrical adhesive inserted into the airtight cylindrical material 2. It consists of a drug holding material 3.

The airtight cylindrical material 2 is made by directly covering the outer surface of a cylindrical woven fabric 4, which is made by weaving warp and weft yarns into a cylindrical shape, with a tube made of thermoplastic polyester elastic resin or the like using an extrusion molding method. M5 is formed.

Further, the adhesive retaining material 3 is made of a reinforced nonwoven fabric 8 formed by overlapping a nonwoven fabric 7 on a sheet material 6 and applying needle punching from the side of the nonwoven fabric 7 to join the sheet material 6 and the nonwoven fabric 7 together. ing.

The nonwoven fabric 7 is preferably a spunbond nonwoven fabric, but is not limited thereto, and may be a normal type 111 fiber nonwoven fabric.6 The specific structure of the adhesive holding material 3 will be described below.

Embodiment 1 The sheet material 6 is made by fixing filamentous materials 9 arranged in a lattice pattern in the vertical and horizontal directions at their intersections. An example of the structure of this sheet material 6 is as follows:
It is assumed that 500 d synthetic fiber filaments e19 are arranged intersectingly at a pitch of 2.5 mm, and are treated with resin to fix the intersections of the filaments 9.

Although it is also possible to use a woven fabric in which the warp and weft are coarsely woven as the sheet material 6, by using the sheet material 6 having the above-described structure, the filamentous material 9 can be straightened without being bent in the vertical and horizontal directions. Since the filament 9 is elongated and hardened by resin processing, even if the structure is coarse, the filament 9 is less likely to shift and change the spacing, and is relatively rigid and has no elasticity, which is preferable.

A nonwoven fabric 7 is superimposed on this sheet material 6. The nonwoven fabric 7 has a single fiber fineness of 6d and a basis weight of 700g.
Use a spunbond nonwoven fabric of /rrr, overlap it on the sheet material 6, and apply it from the nonwoven fabric 7 side with an iin needle to 1-24 per unit.
Adhesive holding material 3 is applied by needle punching with a density of 0 times.
I got it.

Example 2 Using a nonwoven fabric 7 with a single fiber fineness of 8d, Example 1
Adhesive holding material 3 was obtained in the same manner as above.

For comparison, nonwoven fabrics 7 with single fiber fineness of 30 (Comparative Example 1) and 106 (Comparative Example 2) were used, and adhesive retaining material 3 was prepared in the same manner as in Example 1. I got it.

Regarding the adhesive holding material 3 of each example and comparative example, the basis weight,
The thickness, apparent density, compressed thickness, compressibility, and adhesive impregnation were measured.

For the basis weight, take three test pieces of 20CIX 20CI from each adhesive holding material 3, let them reach moisture equilibrium in standard conditions, calculate the basis weight (g/lr?) from their weight, and find the average value. Ta.

The thickness was measured at five different locations on the test piece using a dial thickness gauge (measurement range 0/IQlll, pressure surface 30rgraφ, load 50g), and the average value was determined.

The apparent density was calculated from the basis weight and thickness.

The thickness when compressed is determined by placing the test piece on a flat plate, placing a 10ci x 10 cm presser plate on the test piece, placing a weight on the presser plate, and comparing the presser plate and the weight. A load of 500 g/al was applied to the test piece, and the distance between the lower surface of the flat plate and the upper surface of the holding plate was measured using the dial thickness gauge, and the thickness was determined by subtracting the thickness of the flat plate and the holding plate.

The compression ratio (C) is determined by the thickness of the test piece (1) and the thickness when compressed (T
), it was calculated using the following formula.

-T C= - Also, the impregnation property of the adhesive is determined by the sheet material 6 of each adhesive holding material 3.
With the surface of fFl depressurized to a gauge thickness of 110n1H,
An adhesive having a viscosity of 10,000 cos/20° C. was poured onto the other surface, and the time required for the adhesive to permeate to the surface on the reduced pressure side was measured.

The results of the test are shown in the table.

As can be seen from the results shown above, the examples of the present invention using single fibers with a fineness of 6 to 8 d have a small compression ratio and excellent adhesive impregnation. The lining material having the retaining material 3 is extremely excellent in that it holds the adhesive sufficiently and is not squeezed out excessively during lining.

On the other hand, Comparative Example 1 uses a conventionally commonly used spunbond nonwoven fabric with a single fiber fineness of 3d, but this fabric has a high compression rate despite its high apparent density. This is thought to be because the single fibers are thin and the rigidity of each single fiber is poor. Furthermore, the biggest drawback when using 3D single fibers is that the impregnability of the adhesive is extremely poor.

Furthermore, the nonwoven fabric of Comparative Example 2 with a single fiber fineness of 10 d has excellent adhesive impregnation properties compared to other fabrics, but has poor compression resistance and is compressed during lining, resulting in excessive adhesive absorption. There is a risk that it will be squeezed out. In this material, the fineness of the single fibers is large and the rigidity of each single fiber is high, so the apparent density is low, but the porosity is correspondingly large and it is considered that it is easily compressed.

In addition, in the present invention, since a nonwoven fabric having a single fiber fineness of 6 to 8 d is used, the nonwoven fabric alone has insufficient strength, easily stretches under tension, and lacks dimensional stability. However, in the present invention, the sheet material 6 is overlapped with the sheet material 6 and joined together by needle punching, so that the adhesive holding material 3 has a sufficiently high strength and dimensional stability is ensured.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a pipe lining material of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the reinforcing nonwoven fabric in the lining material of the present invention. 1... Lining material 2... Airtight cylindrical material 3... Adhesive holding material 4...
Cylindrical woven fabric 5...Synthetic resin film 6...
・Sheet material 7...Nonwoven fabric 8...
... Reinforced nonwoven fabric 9 ... Thread-like material

Claims (1)

[Claims] 1. A cylindrical lining material (1) coated with an adhesive on the inner surface is inserted into the pipe while being turned over with pressure fluid, and the lining material (1) is pressed onto the inner surface of the pipe while the above-mentioned The lining material (1) used in the pipe lining method for curing adhesive includes a cylindrical airtight cylindrical material (2) and an airtight cylindrical material (2).
) A sheet material (6) consisting of a cylindrical adhesive retaining material (3) inserted into the inside of the adhesive retaining material (3), and the adhesive retaining material (3) consisting of filamentous materials (9) arranged roughly in a lattice pattern. Mainly from 6 to
A non-woven fabric (7) made of 8d synthetic fibers is overlaid and needle punched to form the sheet material (6) and non-woven fabric (7).
) with an apparent density of 0.14 to 0.
．． A pipe lining material 2 characterized in that it is made of a reinforced nonwoven fabric (8) of 21 g/cm^3.The strength of the sheet material (6) in the circumferential direction is smaller than that of the lining material (1) in the longitudinal direction. Claim 1 characterized by
The pipe lining material 3 according to , wherein the adhesive retaining material (3) is made of
The lining material for a pipe line according to claim 1, characterized in that it is formed into a cylindrical shape with the sheet material (6) on the outside.