JPH0314988A - Inner face resin lining tube and ites manufacture - Google Patents

Abstract

PURPOSE:To improve sufficient durability and sealing performance for a long period by arranging a cylindrical resin lining member with uneven surface on its outer face, at the inner face of pipe, and providing a mortar layer between the outer face of resin lining member and the inner face of pipe. CONSTITUTION:A mortar layer 2 is formed on the inner face of cast-iron made pipe 1. On the inner face of the layer 2, a cylindrical resin lining member 3 is also arranged. This member 3 is capable of being formed of polyvinyl chloride, polyethylene, polybutane and the like. On the outer surface thereof, a plurality of dovetail groove like projections/recesses 4 are formed. In this inner resin lining pipe, the pipe 1 is rotated and applied with mortar on the inner face by centrifugal force to form the mortar layer 2. Thereafter the resin lining member 3 is inserted and mortar curing is carried out. As a result, without preprocessing on the inner face of pipe, the pipe with sufficient durability against corrosive fluid can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an inner resin-lined pipe that can be used as a water pipe, a sewage pipe, a slurry transport pipe, a fluid transport pipe, etc., and a method for manufacturing the pipe. 2. Description of the Related Art Hitherto, as this type of internally resin-lined pipe, there have been known pipes in which the inner surface of a metal pipe such as a cast iron pipe is coated with cement lining, PVC lining, VAi powder lining, or the like.

When applying cement lining, the pipe is rotated around its axis, and the mortar is swayed by centrifugal force and compacted to form a high-strength mortar layer. When applying a PVC lining, a thermally expandable polyvinyl chloride material is set on the inner surface of the pipe and bonded by applying heat and internal pressure, or by squeezing the pipe.

When applying resin powder wood lining, polyethylene powder or epoxy powder is supplied to the inside of the ripened pipe to form the lining layer. 5 Problems to be Solved by the Invention However, with conventional cement lining, there is a problem in that erosion does not occur when the fluid passing through the pipe is acidic water or the like.

When using various resins such as polyvinyl chloride and resin powder, there is a problem in that careful surface preparation of the metal tube is required, which takes time. Another problem is that if the lining is damaged, local corrosion is likely to occur. Furthermore, there is a drawback that adhesiveness becomes unstable due to variations in construction conditions and resin quality. Water may enter the adhesive interface from the tube end, etc., resulting in a decrease in long-term adhesion and the formation of rust.

The present invention solves these problems, has sufficient durability against corrosive fluids, does not reduce the adhesion of the resin lining over a long period of time, and prevents local IZ even if the lining is damaged. To prevent an eclipse from occurring, it is important to make C difficult. Means for Solving the Problems In order to achieve the above object, the inner resin lining pipe of the present invention has a circular resin lining material having an uneven outer surface disposed on the inner surface of the pipe, and the outer surface of the resin lining material A layer of mortar is interposed between the tube and the inner surface. In addition, the method for manufacturing an inner surface resin-lined pipe of the present invention includes applying mortar lining to the inner surface of the pipe, inserting a cylindrical resin lining material having an uneven outer surface into the mortar lining area, and then This is used for mortar curing. Effect: With this configuration, a mortar layer is formed on the inner surface of the pipe, and a layer of resin lining material is also formed on the inner surface, so the lining material does not come into direct contact with the inner surface of the pipe. , there is no need to prepare the inner surface of the pipe. Furthermore, the parts of the pipe that come in contact with the fluid are lined with resin, so they have sufficient durability against corrosive fluids. Since the resin lining material and the mortar physically adhere firmly to each other due to the irregularities on the outer surface of the resin lining material, there is almost no reduction in long-term adhesion due to the intrusion of fluids such as water into the pipe.

Even if the resin lining material suffers some damage locally, since the mortar is present as a base, corrosion will not easily occur, and no problem will occur if the fluid in the pipe is tap water or the like. When the pipe is an iron pipe, the occurrence of IZ corrosion is prevented by the alkaline passivity of the mortar.

Embodiment FIGS. 1 and 2 show an inner resin-lined pipe according to an embodiment of the present invention. Here, 1 is a cast iron pipe, and a mortar layer 2 is formed on its inner surface. Further, on the inner surface of the mortar layer 2, a cylindrical resin lining material 3 is arranged. This resin lining 143 can be made of polyvinyl vinyl, polyethylene, polybutene, etc., and has a large number of ant-like irregularities 4 formed on its outer surface.

When manufacturing such a tube with inner resin lining, the square tube 1 is rotated and mortar is applied to the inner surface by centrifugal force. This mortar contains an expanding agent with a ratio of 4 to 18% to cement. This D, 3D material is calcium aluminate-based or free lime-based! !
Organic swelling materials are preferred.

Once the mortar lining has been installed, the resin lining material 3 is inserted inside and mortar curing is performed. By doing this, an inner resin-lined pipe with the structure shown in the figure can be obtained. Here, since the mortar layer 2 is formed by high-strength centrifugal force molding and expands moderately, the mortar layer 2 and the resin lining material 3 are combined with the unevenness 4 of the initial fat lining material 3 to is physically firmly attached. The adhesion between the mortar layer 2 and the cast iron pipe 1 is also good, and there is no need for surface treatment. Therefore, as the resin lining material 3, it is possible to use a polyethylene pipe that is difficult to adhere to the pipe 1 made of metal such as cast iron. Also, it does not need to be a special type with the same thermal expansion characteristics as tube 1, and a general type can be used. The thickness may be thin as long as it can maintain its cylindrical shape.

This makes it possible to obtain an inner resin-lined tube that has stable adhesion over a long period of time.

Moreover, since the part of the pipe that comes into contact with the fluid is made of resin lining material 3, it has sufficient durability against corrosive fluids. In addition, for example, when the fluid in the pipe is tap water, there is the advantage that it does not adversely affect the quality of the water. As described above, since the mortar layer 2 and the resin lining material 3 are physically strongly adhered to each other, there is almost no reduction in long-term adhesion due to the intrusion of the inside of the pipe from the end of the pipe.

Even if the resin lining material 3 is damaged, since the mortar layer 2 exists underneath, corrosion will not occur easily, and if the fluid in the pipe is tap water, etc. No problems arise. Since the pig iron pipe 1 is covered with the mortar layer 2, corrosion is prevented by the alkali passivity of the mortar.

Incidentally, the irregularities 4 on the outer surface of the resin lining material 3 can have any suitable shape. FIG. 3 shows an inner resin-lined pipe according to another embodiment of the present invention, in which the unevenness 4 includes:
■It is shown that there are many alternating clear parts and mountain parts of the character shape.

Effects of the Invention As described above, according to the present invention, not only can the inner surface of the pipe have sufficient durability against IF and edible fluids without the need for surface treatment, but also resin lining material can be used. Even if damage occurs, localized corrosion can be prevented.

[Brief explanation of the drawing]

FIG. 1 shows an example of an inner resin-lined pipe according to the present invention.
F! Cross-sectional view, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1,
FIG. 3 is a cross-sectional view of an inner resin-lined pipe of an embodiment of the pond of the present invention. 1...Pipe, 2...Mortar layer, 3...Resin lining material, 4...Irregularities.

Claims (1)

[Claims] 1. A cylindrical resin lining material having an uneven outer surface is arranged on the inner surface of the tube, and a mortar layer is interposed between the outer surface of the resin lining material and the inner surface of the tube. Features an inner resin-lined pipe. 2. An inner resin lining characterized in that a mortar lining is applied to the inner surface of the pipe, and a cylindrical resin lining material with an uneven outer surface is inserted into the mortar lining area, followed by mortar curing. Method of manufacturing tubes.