JPS61136084A - Weatherproof and corrosion-resistant annular body and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a weather-resistant and corrosion-resistant ring body and a method for producing the same.

b. Prior art Conventionally, reinforced concrete pipes to be buried underground, such as propulsion pipes and cut-and-build hume pipes, have been joined using iron ring bodies as joints. The iron joint is extremely reliable in terms of mechanical strength and the like.

The problem that the C0 invention attempts to solve However, the above iron I! ! ! Couplings are prone to rust, and due to localized corrosion due to electrolytic corrosion, holes may form in the ring body in a period far shorter than the lifespan of concrete pipes. In order to prevent this drawback, iron joints are painted with epoxy tar, etc., but if there are pinballs in the paint film, or if the paint is applied to the propulsion tube, underground sand may accumulate during propulsion work. , contact with gravel, etc. will cause the friction to be reduced or be scraped off, making it impossible to expect the effectiveness of the coating.

The present invention was made in view of the above circumstances, and is a weather-resistant and corrosion-resistant alternative to the iron rings, which have low corrosion resistance and are used as joints for reinforced concrete pipes buried underground. The purpose is to fold a ring body with excellent mechanical strength.

Means for Solving the d0 Problems, That is, the present invention solves the above problems by providing a weather resistant material made of weather resistant and corrosion resistant materials, glass fibers and/or inorganic solids.

A weather-resistant and corrosion-resistant material is put into a corrosion-resistant ring and a horizontally rotating formwork to form an outer layer with a wall thickness of 0.3 to 3 mm.
Weather resistant when the outer layer is in an unsolidified state.

The present invention provides a method for producing a weather-resistant and corrosion-resistant ring body, characterized in that a corrosion-resistant material, glass fiber, and/or an inorganic solid are simultaneously or alternately introduced and molded to a predetermined thickness.

As the weather-resistant and corrosion-resistant material (hereinafter referred to as resin composition), thermosetting resins such as unsaturated polyester resins and epoxy resins can be used.

In addition, a small amount of colored inorganic or organic fine powder is mixed into the resin composition, for example, 10 to 30% by weight, to color the resin composition to prevent deterioration of the resin in the molded ring body due to sunlight, especially ultraviolet rays, and improve mechanical strength. can also be held.

Examples of the above-mentioned inorganic fine powder include calcium carbonate, acid clay, and silica powder.

Further, as the organic fine powder, for example, an organic pigment can be used.

The resin composition and the inorganic or organic solid can be appropriately selected depending on the performance required of the ring.

As the above-mentioned glass fiber, any fiber that is generally used in FRP products can be used, and is not particularly limited. Chopped strands of 50 m, long fibers of glass fiber, etc. can be used. Furthermore, in order to improve the adhesion with the resin composition used, it is preferable that the surface of the glass fiber be treated, for example, with a silane coupling agent to improve the adhesion between the surface of the glass fiber and the resin. .

The above-mentioned inorganic solids may be those commonly used in FRP products, and are not particularly limited, such as fine sand with a particle size of 1.2 to 0.3 ms, mica powder, especially silica sand. can be used.

The total amount of the resin composition, glass fibers and inorganic solids added is in a weight ratio of 35-55:25-45:
5-40, or if no inorganic solids are used, the weight ratio of the resin composition and glass fiber is 70-5°:30-
Preferably, it is 50.

The above resin composition, glass fiber, and inorganic solid can be added alternately or simultaneously during ring molding, except for the step in which only the resin composition is introduced into the mold when forming the outer layer. . The thickness of the outer layer is desirably within a range of 0.3fi as the minimum thickness and 3fi as the maximum thickness in order to prevent exposure of the glass fibers.

Further, during ring molding, the molding temperature can be heated to 50 to 100'c to accelerate curing of the resin composition.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

Example 1 Figure 1 shows a weather-resistant and corrosion-resistant ring molding apparatus of the present invention. be.

First, an iron formwork 2 is placed horizontally in a molding machine 1, and the formwork 2 is rotated by a motor 5 and a drive unit 5a connected to the motor 5.
Rotate to have a centrifugal force of about 0 to 45G.

Next, feed the weather-resistant and corrosion-resistant material 6 from the feeding machine 3.
(hereinafter referred to as a resin composition) in an amount equivalent to a thickness of 0.3 to 31 nm, and while moving the feeding machine 3 back and forth at a constant speed, add the resin composition to a uniform thickness over the entire length of the formwork 2. I will do it.

Next, the chopped strands 7 of glass fiber and the resin composition 6 are uniformly added over the entire length of the formwork 2 while the feeding machine 3 is moved back and forth at a constant speed. Add it so that it is mixed in.

After this, increase the rotation speed of the molding machine and increase the centrifugal force to 40 to 60
G, and compact it to completely remove any air bubbles brought in by the glass fibers.

At this time, the portion corresponding to the inner surface of the ring body may be compacted with a resin having good elongation and surface finish.

Next, the curing box 4 that covers the entire molding machine 1 is closed, and while rotating the mold 2 at about 20 to 40 G inside the curing box 4, the curing box 4 is indirectly
Air heated to ~100°C is sent in to cure (accelerate hardening of the resin).

This curing process may take 5 to 10 minutes, and after completion of curing, the operation of the molding machine 1 is stopped, the ring 9 attached to the end 8 of the iron formwork 2 shown in FIG. 2 is removed, and the ring 9 shown in FIG. 3 is removed. The ring body 10 formed in this manner is taken out.

The molded ring body 10 has a cross section as shown in FIG. The strands 7 are not exposed to the outer surface 1) of the ring body 10.

Table 1 shows the mechanical properties of ring bodies molded with different blending ratios of the resin composition and glass fiber.

Table 1 Example 2 Figure 5 shows a ring molding apparatus of the present invention, which differs from the molding apparatus shown in Figure 1 in that it is equipped with 12 feeding machines 12a for inorganic solids. It is a point.

The outer layer is added in the same manner as in Example-1.

Next, the resin composition 6, chopped strands 7, and inorganic solids 12 (silica sand, No. 4 to 6) are simultaneously fed into the feeding machine 3 at a constant speed so that they are mixed uniformly over the entire length of the formwork 2. I will do it.

The subsequent manufacturing procedure is the same as in Example 1. As shown in FIG. 6, the molded ring body 13 has chopped strands 7 and inorganic solids 12 uniformly dispersed in the resin composition 6.

The feature of Example 2 is that by adding inorganic solid matter 12, the amount of resin composition 6 mixed can be reduced, leading to cost reduction.

Table 2 shows the relationship between the blending ratio and the mechanical properties of the ring.

Table 2 00 Effects The weather-resistant and corrosion-resistant ring body of the present invention is used in the following usage modes.

FIG. 7 shows a state in which the ring body 10 manufactured according to the present invention is embedded and joined to the outer peripheral end of the propulsion concrete pipe 14, and FIG. 8 is a sectional view thereof. This ring body 10 is set in a formwork for a propulsion fume pipe, and then concrete is poured into the concrete pipe 14 to form the concrete pipe 14, similar to the method of embedding a steel ring body that is currently practiced.
It is firmly attached. An anchor member 17 and a water-stopping rubber ring 18 are provided on the inner surface of the ring body 10 to be embedded to connect the concrete pipe 14 and the concrete pipe 1.
4 and is in close contact with the concrete pipe 19 connected to the concrete pipe 19.

Comparing the ring body of the present invention with the iron ring body, it goes without saying that the corrosion resistance is good, but in addition, the weather-resistant and corrosion-resistant ring body of the present invention is constructed in a way that exceeds the effects of the f0 invention of the ring body. The body is
It has weather resistance and corrosion resistance compared to conventional iron rings.
It also has excellent mechanical strength and is suitable as a joint for reinforced concrete pipes buried underground.

Further, according to the manufacturing method of the present invention, a weather-resistant and corrosion-resistant ring body having sufficient strength can be efficiently manufactured.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram showing a molding apparatus for producing the weather-resistant and corrosion-resistant ring body of the present invention using a resin composition and glass fiber, Fig. 2 is an enlarged cross-sectional view of the main part thereof, and Fig. 3 is a conceptual diagram showing the molding apparatus for producing the weather-resistant and corrosion-resistant ring body of the present invention using a resin composition and glass fiber. FIG. 4 shows a partially enlarged sectional view of such a weather-resistant and corrosion-resistant ring body. FIG. 5 is a conceptual diagram showing a molding apparatus for manufacturing the weather-resistant and corrosion-resistant ring body of the present invention using a resin composition, glass fiber, and inorganic solid, and FIG. 6 is a partial cross-sectional view of the molded ring body. show. FIG. 7 shows the weather-resistant and corrosion-resistant ring body of the present invention attached to a propulsion hume pipe, and FIG. 8 is an enlarged cross-sectional view of the main part thereof.
FIG. 9 shows a state in which hume pipes for cut-and-bury installation are connected by the weather-resistant and corrosion-resistant ring body of the present invention, and FIG. 10 is an enlarged sectional view of the main part thereof. 1...Centrifugal forming machine, 2...Iron formwork, 4
... Curing box, 6. Weather-resistant and corrosion-resistant material (resin composition), 7. Chopped strand of glass iver, 10. Ring body, 12. Inorganic solid.

Claims (9)

[Claims] (1) A weather-resistant and corrosion-resistant ring formed from a weather-resistant and corrosion-resistant material, glass fiber, and/or inorganic solid. (2) Made of weather-resistant and corrosion-resistant materials, glass fibers and inorganic solids, the weight ratio of which is 35-55:25
~45: The weather-resistant and corrosion-resistant ring body according to claim (1), which has a ratio of 5 to 40. (3) The weather-resistant and corrosion-resistant ring body according to claim (1), which is formed from a weather-resistant and corrosion-resistant material and glass fiber, and whose weight ratio is 70-50:30-50. (4) Weather resistance according to claims (1) to (3), characterized in that the weather resistance and corrosion resistance material is colored by mixing a small amount of colored inorganic or organic fine powder. Corrosion-resistant ring. (5) A weather-resistant and corrosion-resistant material is put into a horizontally rotating formwork to form an outer layer with a thickness of 0.3 to 3 mm, and when the outer layer is in an unsolidified state, the weather-resistant and corrosion-resistant material, glass A method for manufacturing a weather-resistant and corrosion-resistant ring body, which comprises adding fibers and/or inorganic solids at the same time or alternately and molding them to a predetermined thickness. (6) The total amount of weather-resistant and corrosion-resistant materials, glass fibers and inorganic solids to be added is 35 to 55:25 by weight.
~45: The method for producing a weather-resistant and corrosion-resistant ring body according to claim (5), wherein the ratio is 5 to 40. (7) Weather resistance and corrosion resistance according to claim (5), characterized in that the total amount of weather and corrosion resistant materials and glass fibers to be added is in a weight ratio of 70 to 50:30 to 50. Method for manufacturing rings. (8) Weather resistance according to claims (5) to (7), characterized in that the molding temperature of the ring body is heated to 50 to 100°C to accelerate curing of the weather and corrosion resistant material. Method for manufacturing a corrosion-resistant ring. (9) Weather resistance according to claims (5) to (8), characterized in that the weather resistance and corrosion resistance material is colored by mixing a small amount of colored inorganic or organic solid matter; Method for manufacturing a corrosion-resistant ring.