KR100233159B1 - Material for repair of sewer pipe and producing process therefor - Google Patents

Abstract

The present invention is a substrate made of a thin, flexible tubular plastic body that can be attached to form a new layer on the inner wall of the sewage pipe by using water pressure at the inlet of the sewage pipe and a manufacturing method thereof. Conventional substrates used multiple layers of nonwoven fabric when the sewage pipe was large in diameter. The present invention has a non-resin-absorbent film coating layer (3) on the outer surface, the end portion is sewn to each other in a tubular shape of the resin-absorbing short-fiber nonwoven sheet (2) in the base material, the mesh in the middle of the sheet (2) The fabric 1 is inserted. In a series of nonwoven fabric processing steps, mesh fabrics are put in the middle of two fibrous sheets each passing through a pair of molding machines and entangled with a needle punching machine to obtain a base sheet.

Description

Sewage pipe repair base and manufacturing method

The present invention is a thin and flexible tubular plastic body that can be attached to form a new layer on the inner wall of the sewer pipe by using water pressure at the inlet of the sewer pipe and a method for manufacturing the sewer pipe (Material for Repair of Sewer Pipe and Producing Process Therefor ).

The sewage pipe repair base material is a material which can be easily installed in the sewage pipe without replacing the sewage pipe when the inside of the old sewer is formed by oxidation or the like. In the installation method using this base material, the tubular shape is cut longer than the length from the sewer branch pipe in the manhole to which the sewn base is to be installed to the sewer pipe main building. And the epoxy resin is mixed well in a base material. The substrate is laid out on the bottom and pushed onto a floor roller to wind up the epoxy resin in the substrate to achieve an even thickness. Drain cleaning rods are then hung at the end of the substrate and pushed into the sewer line to align. In addition, the plastic pipe is erected at the inlet of the sewer pipe, and the calibrated hose inlet is fixed on the silicone hose, and when water is injected, the inner and outer surfaces of the calibrated hose are inverted by the water pressure and enter the sewer pipe. The substrate adheres to the sewer pipe wall by the pressure applied by the water in the calibration hose and cures after 4 to 6 hours. In order to shorten the curing time, hot water can be circulated in the calibration hose. After the elapse of time, the water and the calibration hose are extracted again to complete the work. This process is being implemented by USM Texon Materials Inc.

One such substrate is disclosed in U.S. Pat.No.4446181 (inventive name: tubular thin plastic). The present invention relates to a method of continuously manufacturing a tubular substrate for injecting a curable synthetic resin into a passage or a pipe, and the tubular substrate is a form in which a thin plastic sheet composed of a resin absorbing layer is supplied. The non-absorbing layer is adhered to, and the method of continuously supplying in the longitudinal direction is i) configured in a tubular shape, but the non-absorbing layer is placed on the outside and free cross sections are bonded to each other, and ii) While the remaining sections remain, the sections are sewn to each other by the seam extending by the sewing means, and iii) the adhesive ribbon is coated or coated on the outside of the tubular moving substrate, and the resin leaks through the sewing holes when installing the substrate. It is made wider than the sewing part to prevent it.

However, such a conventional substrate is actually used when applied to sewage pipes having a relatively small diameter. This can be seen from the configuration of the substrate manufactured and constructed by Insituform International Inc., the owner. In other words, a 3.0mm thick substrate coated with a polyurethane film on the outer surface of a polyester short-fiber nonwoven fabric is sewn in a tubular shape within a thickness of 3.0mm.The problem is when the thickness exceeds 3.0mm (e.g., 6.0mm, 9.0mm), the base material is overlapped in two layers (6.0mm) and three layers (9.0mm), and several places (approximately four places) in the circumferential direction have to be thermally bonded at 200 ° C ± 80 ° C.

This is fundamentally due to the nature of polyester short-fiber nonwoven fabrics, which does not increase the tensile strength by making the thickness thicker than the specified thickness. Another reason is that the sewing (zigzag) mentioned in the specification is very difficult. In fact, since the cross-sections are joined using a kind of overlock sewing machine type, the sewing parts protrude in the V-shape to the outside and do not adhere to the inner wall of the sewer pipe.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible sewage pipe repairing substrate and a method of manufacturing the same, having a sufficient tensile strength and having a thickness control and a single nonwoven layer.

1 is a cross-sectional view illustrating the present invention with an enlarged portion thereof.

FIG. 2 (a) is a series of nonwoven fabric processing steps of the present invention for obtaining two fibrous sheets, respectively.

FIG. 2 (b) is a series of nonwoven fabric processing steps of the present invention for thermally bonding a resin ribbon while coating a film on a rolled nonwoven fabric sheet obtained through the process of FIG. 2 (a) and sewing a cross section.

3 is an operation explanatory diagram of a sewer pipe inlet for generating water pressure during construction of the base material.

4 is a diagram illustrating a process of bonding a substrate in a sewer pipe during construction of the substrate.

* Explanation of symbols for main parts of the drawings

1: reticular fabric 2: resin-absorbing short fiber nonwoven sheet

3: non-resin absorbent film (coating layer) 4: resin ribbon

25a, 25b: molding machine 26: needle punching machine

30: woven cloth feeder 31: film feeder

32, 34: heat sealer 33: sewing means

m1, m2: fibrous sheet M: base material

S: sewing

In order to achieve the above object, there is provided a non-resin-absorbent film coating layer on the outer surface, the end of the base material made of a resin-absorbing short-fiber nonwoven sheet stitched together to form a tubular shape, the center of the single-fiber nonwoven sheet It is composed of a structure in which a mesh fabric is inserted into the.

The method for producing such a substrate obtains a resin-absorbing short-fiber nonwoven sheet obtained by a series of nonwoven fabric processing steps, heat-bonds a non-resin absorbent film to the outer surface of the sheet, and welds the sheet between the longitudinal cross sections of the sheet. In the tubular base material manufacturing method which sews by means and heat-bonds a resin ribbon to the outer surface of the sewn part, in the series of said nonwoven fabric processing processes, it meshes in the middle of two fibrous sheets each passing through a pair of molding machines. The woven fabric was entangled with a needle punching machine to obtain a resin absorbing short fiber nonwoven sheet.

According to the configuration as described above, the flexibility is given to both the film and the nonwoven sheet while the tensile strength and elongation are strengthened and the thickness can be adjusted to correspond to the water pressure according to the diameter of the sewer pipe.

Hereinafter, the contents will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a cross section of the substrate (M) of the present invention having a resin-absorbing short-fiber nonwoven sheet 2 having a network fabric 1 interposed therebetween and a non-resin-absorbing film coating layer 3. 0.3 mm is suitable for the non-resin absorptive film 3 as a polyurethane film. The resin absorptive short fiber nonwoven fabric sheet 2 was made of polyester short fiber nonwoven fabric, and the mesh fabric 1 was made of polyester fiber. The mesh fabric 1 may also be a woven fabric consisting of plain or knitted fabrics. Herein, the resin absorbent or non-resin absorbent means a property that the adhesive epoxy resin before curing mixed with the curing agent is not sufficiently impregnated or impregnated.

The reason why the mesh fabric 1 is inserted into the resin-absorbing short fiber nonwoven sheet 2 is to enhance the tensile strength, form stability, and physical property reinforcing ability. It is to ensure that the sewage pipe repair base material conforms to the properties required when manufactured to be applied to various sewage pipes having different diameters with only one film coating layer 3 and the nonwoven sheet 2 as described above. The physical properties required for the sewage pipe repair base must be high in tensile strength, flexibility must be given to the film coating layer 3 and the nonwoven sheet 2, and the film must be given high hydrolysis resistance (water resistance, chemical resistance). will be. Hereinafter, the physical properties of the base material of the present invention and the conventional base material (In-situform International Incorporated) are compared.

TABLE 1

In Table 1, it can be seen that the substrate of the present invention can give the same thickness as that of the conventional two-ply, and in this case, the result is much improved than the conventional one in tensile strength, elongation, and rupture characteristics. Could. The reason for providing this result is possible because the mesh fabric 1 is inserted in the center of the resin-absorbing short fiber nonwoven sheet 2 as described above.

The present invention obtains the resin-absorbing short-fiber nonwoven sheet 2 into which the mesh fabric 1 is inserted according to a series of nonwoven fabric processing steps, and then heat-bonds the non-resin absorbent film 3 to one surface of the nonwoven sheet 2. One substrate (M) continuous in the longitudinal direction is obtained, and the longitudinal cross section of the substrate (M) thus obtained is sewn, and the sewing portion (S) sewn with the resin ribbon (4) is heat-bonded to form a tubular shape. Finally, the equipment for sewer repair is obtained. A series of nonwoven fiber processing steps is described below.

2 (a) and 2 (b) show a series of nonwoven fabric processing steps of the present invention.

Reference numerals 21a and 21b are supplied, 22a and 22b are bale-upners, 23a and 23b are mixing chambers, 24a and 24b are carding machines, 25a and 25b are molding machines, 26 are needle punch blades, 27 are roll calenders and 28 are dryers. , 29 is a winding device, 30 is a woven feeding device, 31 is a film feeding device, 32, 34 is a heat sealer, and 33 is a sewing means.

In FIG. 2 (a), 21a-25a and 21b-25b are the processes for obtaining two fibrous sheets through separate processes, respectively. This process is carried out as follows. The polyester short fibers supplied from the feeders 21a and 21b are respectively opened (unwrapped) in the bale openers 22a and 22b, and the opened fibers are mixed in the mixing chambers 23a and 23b, respectively. Each blended fiber is molded into a thin sheet of fibrous layer at carding machines 24a and 24b. Thereafter, the sheets are placed in the molding machines 25a and 25b, respectively, and a plurality of sheet-like fibrous layers are stacked to form one fibrous sheet m1 and m2. The two fibrous sheets m1 and m2 obtained in this way enter the middle of the polyester network woven fabric 1 fed from the woven feeding device 30, and the two fibrous sheets m1 and m2 are formed by the needle punching machine 26. ) And one reticulated fabric (1) are entangled (combined) with each other. The bound nonwoven fabric sheet is heated and pressurized while passing through the roll calenders 27 and 127, dried while passing through the dryer 28, and then wound in a roll state on the winding device 29.

FIG. 2 (b) shows a processing step of coating a film on a nonwoven fabric sheet in a roll state obtained through the process of FIG. 2 (a), and thermally bonding the resin ribbon while sewing a cross section. In other words, the non-woven fabric sheet having the film coating layer is obtained by thermally bonding the films supplied from the film feeding device 31 to the nonwoven fabric sheets released from the winding device 29 by the heat-adhesive machine 32. The nonwoven fabric sheet is sewn in a zigzag or overlock manner by the sewing means 33 while both end surfaces of the nonwoven fabric face each other. Finally, a thin and flexible tubular shape is attached to the stitched sewing portion S by attaching the resin ribbon 4 of the same material having a width wider than the stitched width, and at the same time by heat-bonding by using the heat bonder 34. The base material M for sewer pipe repair of is obtained.

This substrate (M) is cut to the appropriate length and then applied to the sewer in the manner described in the prior art. That is, with reference to Figures 3 and 4, it is cut longer than the length from the sewer branch pipe to the sewer main pipe in the manhole (H) to install the substrate (M) sewn in a tubular shape. And the epoxy resin 51 is mixed in the base material M well. The substrate M is unfolded on the bottom and pushed by a bottom roller (not shown) so that the epoxy resin 51 in the substrate M has an even thickness and wound up. Thereafter, the waterproof cleaning rod (not shown) is hung on the end of the substrate M and pushed into the sewer pipe 52 to align. Again, the plastic pipe 53 is placed at the inlet of the sewer pipe 52 to fix the inlet of the calibration hose 54 made of silicon on it, and water (W) is injected into the hose (55). The inner and outer surfaces of the calibration hose 54 are reversed by the pressure of) and enter the sewer pipe 52. The base material M is in close contact with the sewer pipe 52 wall by the pressure applied by the water W in the calibration hose 54, and the epoxy resin 51 cures after 4 to 6 hours. In order to shorten the curing time, hot water may be circulated in the calibration hose 52, and after the curing, the water W and the calibration hose 52 are extracted again to complete the work.

Such a substrate of the present invention has a very good entanglement effect when entangled by a needle punching machine by the insertion of the mesh fabric so that the thickness of the nonwoven fabric can be relatively thick, and the flexibility required when the thickness of the nonwoven fabric is increased by such adjustment. However, the tensile strength and bursting (tear) strength increase while maintaining elasticity, so that only one layer of substrate can withstand the hydraulic pressure of large sewage pipes. In addition, since the mesh is inserted, the nonwoven fabric has a feature of having form stability despite the increase in thickness.

Claims (3)

In the base material consisting of a resin-absorbing short-fiber nonwoven sheet having a non-resin absorbent film coating layer on the outer surface and the ends are sewn together to form a tubular shape, characterized in that the structure of the mesh fiber is inserted in the center of the short-fiber nonwoven sheet Equipment for sewer pipe repair to say. According to claim 1, wherein the mesh fabric is sewage pipe repair substrate, characterized in that the woven fabric consisting of plain or knitted. Obtain a resin-absorbing short-fiber nonwoven sheet obtained by a series of nonwoven fabric processing steps, heat-bond a non-resin absorbent film to the outer surface of the sheet, weld the sheet between the longitudinal cross sections of the sheet, and sew by sewing means. In the method of thermally bonding the resin ribbon to the outer surface of the stitched portion, in the series of nonwoven fabric processing steps, the mesh fabric is put in the middle of two fibrous sheets each passing through a pair of molding machines and entangled together with a needle punching machine to absorb resin. A base material for repairing sewage pipes, wherein a short fiber nonwoven fabric sheet is obtained.

Images