JPH072328B2 - Corrosion resistant tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrosion resistant concrete pipe which replaces a cement concrete pipe or a steel pipe.

[0002]

2. Description of the Related Art Conventionally, concrete pipes and steel pipes have been excellent as structural materials, but it is well known that they are vulnerable to erosion due to chemical action. Moreover, since the ceramic tube that is stable to chemical action undergoes a high temperature firing process, it is impossible to arrange the reinforcing bars, so there is concern about the breaking strength. Steel pipes are extremely vulnerable to chemical action and not only have a short service life, but also lose their function as pipelines due to the formation of rust that closes the pipelines. Although PVC pipes are strong in chemical action, they have drawbacks such as the fact that they are easily deformed against earth pressure without the reinforcement of the upper rebar, which is an expensive raw material, and are prone to deterioration due to sunlight.

For example, in sewers, calcium compounds in cement are decomposed by various corrosive gases such as inflowing chemicals such as acid and salt, and hydrogen sulfide generated from sewage, and concrete is deteriorated, which is a social problem. The same applies to steel pipes. Also, resin concrete blocks, etc., in which aggregate for concrete and resin are mixed already exist, but all of these are block pressure molded products such as blocks, and after mixing the resin and aggregate, the desired shape is obtained. The surface of the aggregate is simply coated with resin to form
At present, it is impossible to manufacture high-quality products because the workability is extremely poor due to the resin's early solidification and adhesiveness being too great.

Although there is a cement concrete pipe whose inner surface is subjected to a resin lining by centrifugal force, the coarse aggregate is sprinkled with cement paste and used as the aggregate for the resin lining. There is a problem that it does not adhere to the resin and that the corrosive component easily enters the paste portion of the coarse aggregate and the resin (Japanese Patent Publication No. 53-147).
74). In addition, rotate the cylindrical form, polyester
Resin as the main material, methyl ethyl ketone peroxide
Fine particles of sand, gravel, etc. in a thermosetting resin liquid mixed with
The materials are mixed in advance to form mortar, which is
Then, put the whole mold into the curing box and heat cure.
Resin mortar hardening tube (JP-A-49-106519)
No.), but since it does not use coarse aggregate, it does not give strength,
Large specific gravity due to centrifugal force due to rotation during heat curing
Countless fine aggregates such as sand and gravel move to the outside first,
A micro-cavity is created in the trace and it becomes a porous resin concrete pipe
Structural problem of poor adhesion between resin and aggregate
was there.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to easily and economically obtain a concrete pipe having high strength, chemical stability, corrosion resistance, and smooth inner surface without using cement.

[0006]

In order to achieve the above object, the present invention provides a pipe in which a mixed aggregate layer composed of coarse aggregate and fine aggregate is consolidated by a corrosion resistant self-hardening liquid, and A state in which the reinforcing bar is arranged in the inner part, and a mortar layer is formed on the inner peripheral surface by the fine aggregate and the self-hardening liquid, and the coarse aggregate, the fine aggregate and the reinforcing bar are wet by the self-hardening liquid. In the mixed aggregate layer, the coarse aggregates are in intimate contact with each other from the outer peripheral surface of the pipe to the inner side, and the gap between the coarse aggregates is hardened with the fine aggregates.
It is composed of a corrosion resistant tube filled with mortar with liquid .

[0007]

Therefore, the fine aggregate 3 is generated by centrifugal force inside the corrosion-resistant self-hardening liquid layer 7 held along the inner peripheral surface of the rotary tubular form frame 6.
And the mixed aggregate with the coarse aggregate 2 enters to form the mixed aggregate layer 12. In the aggregate layer 12, due to the centrifugal force, the coarse aggregates 2 are compacted toward the inner peripheral surface (the outer peripheral surface of the mixed aggregate layer 12), and FIGS. 1, 2 (d), (e) and As shown in FIG. 5, the coarse aggregates 2 are in close contact with each other. The self-hardening liquid 1 wets the surfaces of the aggregates 2 and 3, and due to the volume occupied by the aggregates 2 and 3, the liquid 1 advances to the center line side of the mold 6 between the aggregates, and the aggregate layer 12 is submerged in the liquid layer 7 between the coarse aggregates 2.
The gap is filled with mortar of the fine aggregate 3 and the self-hardening liquid 1. So
Then, a thin layer 13 of the self-hardening liquid 1 is formed on the inner circumference of the aggregate layer 12. In this state, the fine aggregate 3 is further placed in the mold 6.
When the fine aggregate is charged, the thin aggregate 1
The mortar layer 5 made of fine aggregate is formed into the inside 3 and the liquid 1 is hardened in that state to solidify and form the aggregate layer 12 and the fine aggregate mortar layer 5. The fine aggregate mortar layer 5 and the fine aggregate 3 in the aggregate layer 12 are integrally continuous, and both layers are integrally formed. After the self-hardening liquid 1 is cured, it is demolded, and the sewer pipe is corroded. It is used in a sexual atmosphere.

Then, the aggregate 2 which is wetted with the self-hardening liquid 1,
Water does not enter the surfaces of the reinforcing rods 3 and the reinforcing bars 4 and is not wet by water or the like. In the mixed aggregate layer 12, the coarse aggregates 2 and 2 are in close contact with each other to disperse the external force.

[0009]

[Embodiment] The wheels 9, 9 are pivotally supported on the machine base 8, and the wheels 9, 9 are supported.
It is possible to rotate the mold 6 around the center line a of the cylinder by supporting the steel cylindrical mold 6 on the top and rotating one of the wheels 9 by the continuously variable transmission motor 10. A mold release agent is applied to the inner peripheral surface of the mold 6 or a mold release material 11 made of paper or the like is stretched. Then, the cage-shaped reinforcing bars 4 are arranged inside the releasing agent or the material 11 along the inner peripheral surface. Then, the motor 10 is started to rotate the mold 6 around the center line a, and in that state, it is diluted with a corrosion-resistant resin liquid (unsaturated polyester resin), heated coal tar liquid, heated asphalt liquid, solvent (thinner, etc.). When a corrosion-resistant self-hardening liquid 1 such as a bituminous agent such as coal tar liquid or diluted asphalt liquid is injected into the rotary mold 6, the liquid 1 rotates along the inner peripheral surface due to its viscosity and becomes constant by centrifugal force. A corrosion resistant self-hardening liquid layer 7 having a thickness is formed and the state is maintained (the state is shown in FIG. 2C).

When the mixed aggregate of the fine aggregate 3 and the coarse aggregate 2 is put into the same frame 6 in that state, the mixed aggregate layer 12 is made uniform in thickness by centrifugal force as shown in FIG. The aggregates 2, 3 are formed by the centrifugal force, enter the self-hardening fluid layer 7 and reach the inner peripheral surface, and the aggregates 2, 2, 3,
3 is compacted toward the outside (from the outer peripheral surface of the pipe to the inside) and in intimate contact with each other, and the self-hardening liquid 1 wets the aggregates 2 and 3 and the reinforcing bar 4 and between the aggregates 2 and 3 And it advances into the gap between the aggregates 2 and 3 and the reinforcing bars 4. Then, the advancing self-hardening liquid 1 is mixed with the fine aggregate 3 in the gap between the coarse aggregates 2 in the mixed aggregate layer 12 .
A mortar with the hard liquid 1 is formed, which appears on the inner circumference of the aggregate layer 12 , and the same layer 12 is submerged in the hard liquid 1 to form a self-hardening liquid thin layer 13 on the inner circumference (Fig. 2 (d)). Figure).

When only the fine aggregate 3 is put into the mold 6 in this state, the fine aggregate 3 enters the thin layer 13 by centrifugal force and is integrated with the fine aggregate portion in the mixed layer 12 to form fine aggregate. The aggregate mortar layer 5 is formed (Fig. 2 (e) figure). According to the experiment, even if the rotation of the mold 6 is stopped at this point, both layers 5, 12
Was held without breaking. After that, the self-hardening liquid 1 hardens relatively quickly to bond the aggregates 2 and 3 and the aggregates 2 and 3 and the reinforcing bar 4 to each other and bond them together.
Can be demolded and the corrosion-resistant concrete pipe 14 can be unloaded.

It is preferable that the self-hardening liquid 1 has a viscosity as low as possible within a range where the adhesiveness after curing is maintained. This is because the aggregates 2 and 3 easily enter the liquid. The same aggregate 2, 3
Is a mixture of the coarse aggregate 2 and the fine aggregate 3 which is kept in a dry state and has as few voids as possible when the aggregates 2 and 3 are charged. After adding up to 9/10, this becomes a uniform mixed aggregate layer 12 and submerged in the self-hardening liquid 1, and then the fine aggregate 3 is centrifugally applied to the remaining 1/10 to 2/10 of the above thin layer 13. And enter as described above. This is for forming the smooth inner surface without causing the coarse aggregate 2 of the mixed aggregate layer 12 to project to the inner surface. The volume ratio of the self-hardening liquid 1 to the aggregates 2 and 3 is appropriately adjusted depending on the use of the pipe 14.
Further, the ratio of the self-hardening liquid 1 containing the aggregates 2 and 3 depends on the concentration of the liquid 1, so that the concentration should be adjusted by the solvent, heating temperature, etc. according to the external pressure strength and water tightness required by the product. You can The reference numeral 15 in the figure indicates both end flanges of the form 6,
Reference numeral 6 is a wheel receiving tire provided on the outer periphery of the mold 6, 17 is a wheel adjuster provided on the rotating shaft of one of the wheels 9, and 18 is the motor 10 described above.
A reference numeral 19 is a string provided on the output shaft of the above, and a reference numeral 19 is a string attached to both the adjustment wheels 17 and 18.

[0013]

Since the present invention is constructed as described above, since the surfaces of the aggregates 2 and 3 and the reinforcing bars 4 are wet with the self-hardening liquid 1, there is no risk of water or the like entering the surfaces. , therefore weather resistance, and obtained safely use in sewer pipe and the like corrosive atmosphere rich in acid resistance corrosion resistance and the like, tightly have contact tangling engagement addition to coarse aggregate 2 mutually compacted firmly tightened, and the crude bone Material 2,
The gap of 2 is filled with mortar of fine aggregate 3 and self-hardening liquid 1.
Is a sufficient strength for being, and the effect of coarse aggregate reduce the amount of the own hard liquid 1 from the gap is small between 2 and economical corrosion resistance tube can be easily obtained by a rotating cylindrical mold 6 is there.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing a corrosion resistant pipe of the present invention.

2 (a) (b) (c) (d) (e) FIG. 2 is a manufacturing process diagram.

FIG. 3 is a vertical sectional front view of a tubular form and a reinforcing bar.

FIG. 4 is a vertical sectional side view of FIG.

FIG. 5 is a vertical cross-sectional view immediately before demolding.

[Explanation of symbols]

 1 Corrosion resistant self-hardening liquid 2 Coarse aggregate 3 Fine aggregate 4 Reinforcing bar 5 Mortar layer 12 Mixed aggregate layer

Claims (2)

[Claims] 1. A pipe in which a mixed aggregate layer made of coarse aggregate and fine aggregate is consolidated and formed by a corrosion resistant self-hardening liquid, in which reinforcing bars are arranged inside and fine bone is formed on the inner peripheral surface. Made of a mortar layer composed of a material and the self-hardening liquid, and solidified in a state in which coarse aggregate, fine aggregate and rebar are wetted by the self-hardening liquid, and coarse bone in the mixed aggregate layer. The materials are in intimate contact with each other from the outer peripheral surface of the pipe to the inside, and the gap between the coarse aggregates is made into fine aggregates.
Corrosion-resistant pipe filled with mortar with self-hardening liquid . 2. The coarse aggregate is in intimate contact with each other from the outer peripheral surface to the inner side by a centrifugal force generated by the rotation of the tube.
(1) Corrosion resistant pipe as described.