JPS62894Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is suitable for water supply and drainage, hot water pipes, ventilation pipes, etc., and is suitable for the outer peripheral surface of synthetic resin pipes. Or it relates to a cladding tube provided with a pine coating layer.

Water supply and drainage (or hot water) piped to houses, buildings, etc.
Iron pipes, vinyl chloride resin pipes, etc. are mainly used as pipes and ventilation pipes. However, iron pipes have the drawbacks of severe internal corrosion and are heavy, while synthetic resin pipes such as PVC pipes have a fatal drawback of poor fire resistance and low strength. Both of these pipes have a common disadvantage in that they tend to generate a lot of noise when draining water.

In particular, in view of the above-mentioned drawbacks of synthetic resin pipes, for example, coated pipes in which the outer peripheral surface of a PVC pipe is coated with an asbestos-cement mixture material have been proposed and are commercially available. This cladding pipe has the advantage of increasing mechanical strength and providing fireproofing effects due to the coating material, but on the other hand, it is heavy and difficult to handle, and because it uses asbestos fibers, it is difficult to handle during manufacturing and piping work. There is a problem in terms of hygiene management due to asbestos damage in cutting etc. Furthermore, cement has problems with productivity because it takes a long time to reach the point where it develops strength, and because it has poor flexibility, it cannot follow the expansion and contraction of synthetic resin pipes, making it easy for cracks to occur in the coating layer. has.

The present invention was devised with the aim of improving the problems of the above-mentioned coated synthetic resin pipes and providing a coated pipe suitable for water supply/drainage/hot water pipes. It is characterized in that a cement substance hydrate is integrally contained or adhered to the entire layer of cloth or mat made of organic fibers or artificial mineral fibers.

Hereinafter, the configuration and effects of the present invention will be explained with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the structure of the cladding tube of the present invention, and FIG. 2 is a perspective view thereof. In the figure 1
2 is a synthetic resin pipe; 2 is a covering material made of a pine (or cloth) 2a made of organic fibers or artificial mineral fibers containing or adhering a cement substance hydrate 2b over the entire layer; This structure is formed by providing a predetermined thickness on the outer peripheral surface of the resin pipe 1.

The method of wrapping the sheathing material 2 around the outer peripheral surface of the synthetic resin pipe 1 constituting the cladding tube shown in FIG. 2 is to wrap the sheathing material 2 around the surface of the synthetic resin pipe to a predetermined thickness as shown in FIG. Alternatively, the covering material 2 may be spirally wound around the outer peripheral surface of the synthetic resin pipe 1.

Examples of the organic fibers or artificial mineral fibers of the present invention are as follows. That is, cotton,
Hemp, cellulose fiber, various animal and plant fibers, various synthetic fibers, rock wool, slag wool, glass fiber, various ceramic fibers, carbon fiber, etc.
A covering material is prepared by impregnating and adhering an aqueous slurry of a cement substance to a cloth or mat made of the above-mentioned fibers.

Cement substances in the present invention are substances that harden through a hydration reaction, such as gypsum, Portland cement, slag cement, silica cement, flyash cement, alumina cement, and high sulfate cement (jet cement, etc.). For example, if necessary, these may be mixed and used, and silicic raw materials, other aggregates, fillers, and extenders may be added and used. If necessary, it is also possible to use a setting regulator, a dispersant, and a water reducing agent. This coating material is wrapped around the outer peripheral surface of a synthetic resin pipe to form a coating layer, so it increases the mechanical strength of the synthetic resin pipe and provides excellent fire resistance and heat insulation. The effect of the cloth or mat made of organic fibers or artificial mineral fibers that constitute the cement prevents the generation of harmful expansion cracks or contraction cracks in the hardened cement product, and disperses these cracks into a large number of harmless micro-cracks. It significantly improves various performances such as

Furthermore, in the present invention, cloth or pine also helps shape and retain the shape, so the cladding tube can be handled without waiting for the cement material to completely harden, thereby improving productivity and mass production. It is lighter than cement-based materials, making piping work much easier. In addition, there are other benefits such as there is no risk of causing physiological disorders like asbestos.

The cladding tube of the present invention is manufactured by the following process.

FIG. 3 is a schematic diagram showing an example of the manufacturing process, and description will be given based on this diagram. Note that the same reference numerals as in FIG. 1 indicate the same components.

Reference numeral A indicates a bobbin in which a mat (or cloth) 2a made of, for example, glass fiber is wound into a roll. While the slurry 2b is being sent out from the gypsum slurry supply device F installed above the receiving tank,
The slurry is supplied thinly onto the upper surface of the mat 2a, and the ringer roller E uniformly impregnates and adheres the slurry to form the coating material 2. The synthetic resin is gripped by a rotating gripper (not shown) and rotates in the direction of the arrow. It is wrapped around the outer peripheral surface of the tube 1, and when a predetermined thickness is reached, the rotation of the tube is stopped and the coating material is cut to complete the coating. After that, let the gypsum slurry harden and dry.
If necessary, the coated surface is coated to produce a product.

In the present invention, the coating material is spirally wound around the surface of the synthetic resin pipe by rotating the synthetic resin pipe on a support stand that is movable in the axial direction and rotating the synthetic resin pipe at a predetermined rate in accordance with the moving speed of the support stand. One example is feeding and winding the dressing at an oblique angle.

As for the sheathing material, which is one of the elements constituting the sheathing tube of the present invention, the bulk specific gravity can be freely selected by adjusting the amount of slurry impregnated and adhered to the cloth or mat made of organic fibers or artificial mineral fibers as described above. It has the feature of being able to Furthermore, in order to adjust the amount of slurry that is impregnated and adhered, the viscosity of the slurry,
It is also possible by varying the density and thickness of the fabric or mat.

As described above, the cladding tube of the present invention is very easy to manufacture, and therefore mass production is easy, and manufacturing costs can be reduced.

Next, typical examples will be described.

Example 1 A slurry of β-hemihydrate gypsum (approximately 80 wt% gypsum, ^0.05 wt% sodium citrate) was placed on a commercially available glass chopped strand pine with a width of 1000 mm and a standard weight of 300 g per 1 m 2 of gypsum per 1 m ² of the mat. Supplied so that the weight is 1500g, and after being impregnated and attached, the outer diameter is 60mm.
It was wrapped around the outer circumference of a hard vinyl chloride resin pipe, cured, and dried to obtain a coated pipe with an outer diameter of 83 mm.

The properties of the coating material (thickness: 11.5 mm) after curing were as follows.

Bulk specific gravity: 0.7 Bending strength: 40Kg/cm ² Thermal conductivity: 0.12kcal/m.hr.℃ Also, the fire resistance test of the obtained cladding tube penetrated a fireproof box with a side of 1m made of commercially available fireproofing material. to do,
The cladding tube was attached, and the inside of the box was heated for 2 hours using a furnace oil burner according to the temperature curve specified in JIS A 1304. When taken out after cooling, the hard PVC pipe was found to have melted and deformed, but the covering material remained in its original shape with almost no change. Moreover, its strength was sufficient to keep the piping intact. From this, it is considered to be effective in preventing the spread of fire along the pipe.

Example 2 After kneading Portland cement and perlite in a ratio of 10:2 with water on the outer circumferential surface of a thin-walled hard PVC pipe (outer diameter 60 mm), the width of cheesecloth (material: cotton) was mixed.
Wrap a thinly stretched covering material over 1000mm, and
A cladding tube of 83 mm was obtained. After curing for one week in a humid air condition at 30°C, the product was dried. The specific gravity of the coating material after curing is approximately 0.9, the bending strength is 52Kg/cm ² , and the thermal conductivity is
It was 0.20kcal/m.hr.℃. Further, when this cladding tube was subjected to the same fire resistance test as in Example 1, it was confirmed that it had sufficient fire resistance performance.

As described above, the cladding pipe of the present invention has excellent fire resistance, heat insulation properties, and strength, and can be made into a lightweight pipe material that does not generate cracks and has a soundproofing effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the cladding tube of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a schematic view showing an example of the manufacturing process of the cladding tube of the present invention. 1...Synthetic resin pipe, 2...Coating material, 2a...Cloth/mat made of organic fiber or artificial mineral fiber, 2b...Gypsum-based slurry.

Claims (1)

[Scope of utility model registration request] A cladding tube characterized in that a cement substance hydrate is integrally contained or adhered to the entire layer of a cloth or mat made of organic fibers or artificial mineral fibers wrapped around the outer peripheral surface of a synthetic resin tube.