JPS6110078Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a base material used for lining pipes such as existing water pipes and gas pipes.

In recent years, in order to prevent the aforementioned existing pipes from deteriorating in strength due to rust and corrosion, a cylindrical base material consisting of an inner synthetic resin film layer and an outer fiber layer is heated to the outer fiber layer. The fiber layer impregnated with a curable resin (mainly epoxy resin) is inserted into the pipe, and then the base material is inflated with compressed air, etc., and the fiber layer impregnated with the thermosetting resin is crimped onto the inner wall of the pipe, and the fiber layer is then thermoset. harden the resin
The FRP structure is used to reinforce the strength of the pipe, and the inner synthetic resin film layer prevents internal fluid from leaking. The law for lining existing pipes is attracting attention.

By the way, since the base material used in this construction method is used as described above, it is said that it must have various properties as shown below.

1 First, the inner film layer must have excellent water impermeability and impermeability.

2 The outer fiber layer must be one that is easily compatible with the thermosetting resin and capable of being impregnated with a large amount of the thermosetting resin.

3. Furthermore, since the base material is inserted into the pipe, it must be flexible and have high tensile strength in the length direction.

4 Furthermore, the outer fiber layer must be resistant to abrasion due to contact friction with the inner wall of the pipe when inserted into the pipe, and must not move on the surface of the film layer and cause the distribution of fibers to be disturbed. No.

However, at present, the reality is that a base material that satisfies all of these characteristics has not yet been provided.

In view of these circumstances, the present invention aims to provide a base material that solves all of the above-mentioned characteristics at once.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. First, in FIG. It is a woven fabric. The nylon film 1 is, for example, nylon 6.
or 66 are used. Nylon resin is waterproof,
Not only does it have excellent impermeability, but it also firmly adheres to thermosetting resins. Note that this nylon film 1 may have an inner layer of polyethylene resin on its inner surface. In this way, since the polyethylene resin of the inner layer has excellent chemical resistance, corrosion can be prevented, and leakage of internal fluid containing organic substances, such as city gas, can be reliably prevented.

Next, regarding the woven fabric 2, first, this woven fabric 2 is made of nylon fiber. Generally FRP
Glass fiber is used as the fiber that makes up the
Glass fibers are unsuitable in this case because they have poor flexibility and are susceptible to abrasion. However, this does not necessarily mean that any fiber is suitable as long as it is flexible and resistant to abrasion. This is because it must be easily compatible with thermosetting resins. By the way, this woven fabric 2 is to be bonded to the above-mentioned nylon film 1 as will be described later, but it is generally said that the fibers must be pretreated in order to be bonded. However, pretreatment makes it difficult for the thermosetting resin to adhere to the fibers, so the fibers must be able to adhere sufficiently to the nylon film 1 even without pretreatment. Taking all of these points into consideration, nylon fibers are the most suitable fibers for use in the woven fabric 2.

The woven fabric 2 using nylon fibers as described above is woven relatively coarsely and uniformly. For example, one multifilament yarn of nylon 840 denier is used for the warp, and one multifilament yarn of the same 840 denier is used for the weft, with a density of 6 (warp) and 6 (weft) per cm, respectively. It is woven into a plain weave. Of course, it is not limited to plain weave, and may be woven with other structures. In particular, when the moss weave is woven into a twill weave, the thickness increases, so the space between the weaves increases, and a large amount of thermosetting resin can be impregnated. Furthermore, since the texture of this structure does not easily shift, even if the surface is rubbed, the uniform distribution of fibers will not be disturbed.

The nylon film 1 and the cylindrical woven fabric 2 thus formed are bonded together without filling the spaces 3 between the weaves, as shown in the enlarged view of FIG. This adhesion can be obtained, for example, by directly laminating the extruded nylon film 1 onto the woven fabric 2. Of course, it goes without saying that it can also be obtained by other methods. In particular,
By providing a thin and uniform adhesive layer on the surface of the nylon film 1 and bonding with this layer, a stronger bond can be obtained than that obtained by other methods. Of course, the adhesive layer at this time is made of the same material as the nylon film. For example, it is a low melting point nylon resin copolymerized mainly from nylon 11 or 12.

Since the base material of the present invention formed in this way uses a nylon film for the inner layer, the inner film layer can be made excellent in water impermeability and impermeability. Moreover, since the nylon film firmly adheres to the thermosetting resin, it can be made without peeling off from the reinforced part of the FRP.

Further, since the outer fiber layer uses a cylindrical woven fabric made of relatively coarse and uniform nylon fibers, it can be made resistant to abrasion and flexible. Further, since the woven fabric is bonded to the nylon film without filling the spaces between the weaves, the thermosetting resin can be infiltrated into the spaces between the weaves and impregnated in a large amount.

Furthermore, the nylon film of the inner layer and the woven fabric of the outer layer are bonded together as described above, and because the bonding is sufficient, the woven fabric supports the tensile force in the longitudinal direction of the base material. Furthermore, the woven fabric itself is fixed so that the weave does not shift. In this way, the base material of the present invention satisfies all of the above-mentioned properties, so when it is used to line a pipe, leakage of internal fluid can be reliably prevented, and the pipe can be lined uniformly and reliably. It is possible to construct a reinforcing lining.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the base material of the present invention.
FIG. 2 is an enlarged view showing adhesion between a nylon film and a woven fabric. 1... Nylon film, 2... Cylindrical woven fabric,
3...The space between the weaves.

Claims (1)

[Claims for Utility Model Registration] 1. A nylon film is bonded to the inner surface of a cylindrical woven fabric made of nylon fibers woven relatively coarsely and uniformly, without filling in the gaps between the weaves. Base material for lining existing pipes. 2. The base material for lining an existing pipe according to claim 1, wherein the nylon film has an inner layer of polyethylene on its inner surface. 3. The base material for lining an existing pipe according to claim 1 or 2 of the utility model registration claim, characterized in that the cylindrical woven fabric is woven into a patterned weave or a woven weave. 4. A claim for registration of a utility model characterized in that a nylon film and a cylindrical woven fabric are bonded by providing a thin and uniform adhesive layer of a nylon resin with a low melting point on the surface of the nylon film. A base material for lining an existing pipe according to item 1, item 2, or item 3.