JP4409686B2 - Lining tube base material and lining tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube base material and a tube used for lining an inner surface of a pipe such as a sewage pipe.
[0002]
[Prior art]
Conventionally, when lining the inner surface of a sewage pipe or the like, a lining tube in which a tube base material is impregnated with a curable resin is drawn into the tube, and the tube is pressed against the inner surface of the tube with air pressure or water pressure. A lining method in which the resin is thermally cured or photocured is employed.
[0003]
In such a lining method, a lining tube in which a felt made of an organic fiber such as polyester fiber is used as a tube base material and impregnated with a curable resin is often used. Further, a glass cloth or a glass mat may be used as a tube base material.
[0004]
[Problems to be solved by the invention]
However, the lining tube impregnated with a curable resin using an organic fiber felt as a tube base material has a problem that the strength of the inner surface of the tube inner surface formed by curing of the resin is not so high.
[0005]
On the other hand, a lining tube impregnated with a curable resin using a glass cloth or glass mat that has been thickened to increase its strength as a tube base is difficult to stretch in the circumferential direction. It is difficult to adhere to the inner surface of the tube, and in particular, those using a glass mat as a tube base material have insufficient tensile strength in the axial direction.
[0006]
Therefore, the present inventors have already filed an application for developing a lining tube base and a lining tube that can solve these problems (Japanese Patent Application No. 7-276426). There was still room for improvement.
[0007]
The present invention has been made in view of the above circumstances, and the object thereof is to have a large axial tensile strength, to be in close contact with the inner surface of the tube, and to have a greater pressure strength for curing the impregnating resin. An object of the present invention is to provide a lining tube base material and a lining tube capable of forming a lining on the inner surface of the tube.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a lining tube base material according to claim 1 of the present invention is a tube base material formed by laminating an inner layer and an outer layer, and the inner layer is an axial glass roving and glass chopped strand from the inside. Matt, circumferential glass roving, glass felt, axial glass roving is layered sequentially, outer layer is axial glass roving from outside, glass chopped strand mat, circumferential glass roving, glass felt, the page of stacked layers der the glass roving in the axial direction, the glass roving in the circumferential direction of the inner layer and the outer layer are cut substantially constant length, the position in the circumferential direction so as to overlap each half length to each other the features that you have superimposed on the plurality of stages by shifting.
[0009]
Further, the lining tube base material according to claim 2 of the present invention, the Te claim 1 tube base odor, is characterized in that the superimposed non-woven polyester fabric on the inside of the inner layer of that.
[0010]
And the lining tube which concerns on Claim 3 of this invention impregnates curable resin in the lining tube base material described in the said Claim 1 or 2 .
[0011]
When the axial glass roving is overlapped on both surfaces of the inner layer and the outer layer as in the lining tube base material according to claim 1, the glass roving gives a high tensile strength, and the axial direction of the tube base material is increased. Elongation hardly occurs. Therefore, the lining tube according to claim 3 in which the tube base material is impregnated with the curable resin does not have a fear of being stretched or broken even when a large tensile force is applied when the tube is drawn into the tube.
[0012]
Moreover, when the glass roving of the circumferential direction is provided in the inner layer and the outer layer so as to overlap each other as in the lining tube base material according to claim 1, this glass roving greatly contributes to the improvement of the pressure resistance as a reinforcing material. To do. Accordingly, the lining tube according to claim 3 in which the tube base material is impregnated with the curable resin is drawn into the tube, and the tube is expanded by a fluid pressure such as air to cure the impregnated resin while being attached to the inner surface of the tube. Then, it is possible to form a lining on the inner surface of the tube having a high strength, particularly a high pressure strength.
[0013]
And like the lining tube base material of Claim 1 , the circumferential direction glass roving of an inner layer and an outer layer is cut | disconnected by substantially fixed length, and it is circumferential direction so that it may mutually overlap by half length mutually. If the position is shifted and stacked in multiple stages, this glass roving is easily stretched in the circumferential direction, and the glass chopped strand mat and glass felt are also easily stretched, so that the tube base can be expanded relatively easily. Become. Therefore, when the lining tube of claim 3 in which the lining tube base material is impregnated with a curable resin is drawn into the tube and expanded by fluid pressure, the tube diameter is slightly smaller than the tube inner diameter. Since the tube extends in the circumferential direction and adheres closely to the inner surface of the tube, it is possible to form a lining without a gap between the tube and the inner surface.
[0014]
Further, as in the lining tube base material according to claim 2 , when the polyester non-woven fabric is overlapped on the inner side of the inner layer and the tube base material is impregnated with a curable resin, the lining tube according to claim 3 is formed. The glass fiber of glass roving and glass chopped strand mat is not exposed to the inner surface of the tube, so the smoothness of the inner surface of the tube is improved, and the polyester nonwoven fabric also significantly improves the chemical resistance and wear resistance of the lining (cured tube). .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a schematic cross-sectional view of a lining tube base material according to an embodiment of the present invention, and FIG. 2 is an enlarged partial cross-sectional view showing in detail a portion surrounded by a circle in FIG.
[0017]
As shown in FIG. 1, the lining tube base material is formed by laminating an inner layer 1 and an outer layer 2, and a polyester nonwoven fabric 3 is superimposed on the inner side of the inner layer 1.
[0018]
As shown in FIG. 2, the inner layer 1 is a layer in which an axial glass roving 4, a glass chopped strand mat 5, a circumferential glass roving 6, a glass felt 7, and an axial glass roving 4 are sequentially stacked from the inside. The outer layer 2 is a layer in which an axial glass roving 4, a glass chopped strand mat 5, a circumferential glass roving 6, a glass felt 7, and an axial glass roving 4 are sequentially stacked from the outside.
[0019]
Since the glass roving 4 in the axial direction is a reinforcing material for imparting sufficient tensile strength by eliminating the elongation in the axial direction of the tube base material, the thickness and interval of the glass roving 4 are obtained so that sufficient tensile strength can be obtained. For example, it is possible to pass a glass roving 4 having a thickness of about 0.1 to 0.5 mm and a width of about 3 to 8 mm in the axial direction with an interval of about 7 to 15 mm in the circumferential direction. preferable.
[0020]
Moreover, as the glass chopped strand mat 5, for example, a mat in which glass chopped strands having a length of about 50 to 150 mm are deposited and stitched with a synthetic resin thread such as polyester so that the strands are not scattered is used. In particular, a mat in which 50% or more of the glass chopped strands are oriented in the circumferential direction and stitched in the axial direction with a synthetic resin yarn is preferably used because it easily extends in the circumferential direction.
[0021]
As shown in FIG. 2, the circumferential glass roving 6 is cut into a substantially constant length, and is overlapped in four stages while being shifted in the circumferential direction so as to overlap each other by half the length. Therefore, it is easy to extend in the circumferential direction.
[0022]
The glass roving 6 in the circumferential direction is preferably about 3 to 8 mm in width, about 0.2 to 0.5 mm in thickness, and about 50 to 200 mm in length. Is appropriate. If the glass roving 6 thicker than 0.5 mm is stacked more than 6 steps, the rigidity of the tube base material becomes too high, so that folding and handling becomes inconvenient, and conversely if the glass roving thinner than 0.2 mm is stacked in 2 steps or less. Further, since reinforcement by glass roving in the circumferential direction becomes insufficient, it becomes difficult to form a lining on the inner surface of the tube having a high pressure resistance.
[0023]
The glass felt 7 is made by overlapping and shrinking glass fibers, and the thickness thereof is appropriately determined so that a strong lining is formed in consideration of the diameter when the tube base material is expanded. do it.
[0024]
The lining tube base material having the above-described configuration is manufactured, for example, by the following method.
[0025]
First, glass rovings 4 are arranged in the axial direction, glass chopped strand mats 5 are stacked thereon, and glass rovings 6 of a certain length are stacked on each of the four stages by staggering the positions in half in the circumferential direction. A glass felt 7 is stacked thereon, and a glass roving 4 is arranged on the glass felt 7 in the axial direction, and these are integrally sewn with a synthetic resin thread such as polyester to form a laminate. Then, using two of these laminates, one of them is an outer layer 2 and the other one is turned over and stacked as an inner layer 1, and a polyester nonwoven fabric 3 is further stacked thereon to form a tube. When folded and stitched with the same synthetic resin thread, the above-mentioned lining tube base material is obtained. In that case, it is desirable that the positions of the stitched end portion of the inner layer 1 and the stitched end portion of the outer layer 2 be symmetrical.
[0026]
In the basic embodiment of the lining tube of the present invention, the above-described tube base material is impregnated with a curable resin, whereby the inner gaps of the glass chopped strand mat 5 constituting the inner and outer layers 1 and 2, the glass felt 7. A curable resin is held in an internal space or a space between the glass rovings 4 and 7.
[0027]
As the curable resin to be impregnated, any of thermosetting, radiation curable, and natural curable resins can be used. For example, epoxy resins, vinyl ester resins, and polyester resins are preferably used.
[0028]
Moreover, as a resin impregnation method, the method of dipping a tube base material in the tank of curable resin liquid is employ | adopted suitably.
[0029]
When lining the inner surface of an existing pipe such as a sewage pipe using such a lining tube, the tube is pulled into the pipe, and the tube is inflated with a fluid pressure such as air pressure or water pressure and pressed against the inner surface of the pipe. If the impregnated resin is naturally cured in the state, or it is cured by supplying a heating medium such as heated air or hot water, or radiation curing is performed while moving an irradiation device such as ultraviolet rays in the tube. Well, when the impregnating resin is cured in this way, a high-strength lining reinforced with glass fibers can be formed on the inner surface of the tube.
[0030]
In particular, in this lining tube, since the glass roving 6 in the circumferential direction is provided on the inner and outer layers 1 and 2 of the tube base material, it is possible to form a lining with extremely high pressure resistance by the reinforcing action. In addition, since the glass roving 6 in the circumferential direction is cut into a substantially constant length and is overlapped in four stages by shifting the position in the circumferential direction so as to overlap each other by half the length, the circumferential direction Since the glass chopped strand mat 5 and the glass felt 7 are also easily stretched, even if this lining tube is slightly smaller in diameter than the inner diameter of the tube, when the tube is expanded by fluid pressure, the tube extends in the circumferential direction. Even if there is a slight step at the joint between the tube and the tube, the tube can be in close contact with the tube inner surface while expanding and contracting. Accordingly, the concern that a gap is generated between the inner lining (cured tube) formed by curing the impregnating resin and the inner surface of the tube is also eliminated.
[0031]
Furthermore, since this tube for lining has axial glass roving 4 on its tube base, the tensile strength in the axial direction is large, so even when a large tensile force is applied when the tube is pulled into the tube. There is no concern that the tube will stretch or break.
[0032]
Moreover, since the polyester nonwoven fabric 3 is provided inside the inner layer 1 of the tube, the glass fibers of the axial glass roving 4 and the glass chopped strand mat 5 are not exposed to the inner surface of the tube, and the smoothness of the inner surface of the tube is improved. At the same time, the polyester nonwoven fabric 3 improves chemical resistance and wear resistance. The polyester nonwoven fabric 3 and the synthetic resin film provided inside the interior 1 thus play an important role in supplying air vapor or the like to inflate the lining tube.
[0033]
Although not shown in the figure, the outer layer 2 may be further covered with a skin material. As the outer skin material, various synthetic resin films such as polyethylene film, nylon film, polypropylene film, and laminate film of polyethylene film and nylon film are preferably used.
[0034]
When coated with a skin material in this way, the odor of the impregnated resin is blocked by the skin material, so there is no fear of being uncomfortable due to the resin odor, and sticking due to the impregnated resin is also prevented by the skin material, making handling easier Furthermore, since the invasion of moisture into the tube is also prevented by the outer skin material, the fear of poor curing of the impregnating resin is solved.
[0035]
【The invention's effect】
As is clear from the above description, the lining tube base material of the present invention has a high tensile strength in the axial direction and good elongation in the circumferential direction, and therefore the lining tube of the present invention impregnated with a curable resin. There is no risk of stretching or breaking even when a large tensile force is applied when the tube is pulled into the tube, and when the tube is expanded by fluid pressure, it extends in the circumferential direction and adheres closely to the inner surface of the tube. Due to the reinforcing action of the glass roving in the direction, there is an effect that it is possible to form a strong inner surface of the tube with high pressure strength. Further, a polyester nonwoven fabric further laminated on the inner side of the inner layer has the effect that the inner surface of the formed lining (cured tube) is smooth and has a good flow of water, and also has improved chemical resistance and wear resistance. .
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a lining tube base material according to an embodiment of the present invention.
FIG. 2 is an enlarged partial cross-sectional view showing in detail a portion surrounded by a circle in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner layer 2 Outer layer 3 Polyester nonwoven fabric 4 Axial glass roving 5 Glass chopped strand mat 6 Circumferential glass roving 7 Glass felt

Claims (3)

A tube base material formed by laminating an inner layer and an outer layer, and the inner layer is a layer in which axial glass roving, glass chopped strand mat, circumferential glass roving, glass felt, and axial glass roving are sequentially stacked from the inside. , and the outer layer axial direction of the glass roving from the outside, a glass chopped strand mat, the circumferential direction of the glass roving, glass felts, sequentially stacked layers der the glass roving in the axial direction is, the inner and outer layers in the circumferential direction glass roving is cut substantially constant length, the lining tube base characterized that you have superimposed on the plurality of stages by shifting the position in the circumferential direction so as to overlap each half length to each other. The lining tube base material according to claim 1 , wherein a polyester nonwoven fabric is laminated on the inner side of the inner layer. A lining tube obtained by impregnating a curable resin into the lining tube base material according to claim 1 .

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