JPH067263Y2 - Acid resistant concrete tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acid-resistant concrete pipe in which a synthetic resin film is laminated on the inner surface of the concrete pipe.

It has long been known that concrete generally corrodes in an acidic environment. Synthetic resin linings and synthetic resin sheets are attached to the inner surface of concrete pipes that are mainly used as sewer pipes to prevent this corrosion, but concrete and synthetic resin sheets are extremely adhesive. However, it has been considered to use an adhesive on the inner surface of the concrete pipe after curing, or to heat and fuse it, but perfect adhesion cannot be expected, and peeling occurs in a short period of time, making it an acid-resistant concrete pipe. Doing so will cause damage to the pipeline. In addition, in a concrete pipe lined with synthetic resin, fine holes (pinholes) in the lining material cannot be avoided, and acidic liquids or gases enter between the concrete and the lining material through this pinhole, and in this case also In the meantime, it is no longer used as an acid-resistant concrete pipe, causing damage to the pipeline.

A method of embedding anchor projections in concrete when concrete pipe is molded while concrete is uncured by using a sheet with many projections for anchors on the back surface of the synthetic resin sheet to improve adhesion Although it is conceivable, since the adhesiveness to concrete is poor as described above, peeling is likely to occur, and moreover, there is a possibility that cracks may occur in the concrete layer from the protruding anchor portion. The acid component in the pipe is mainly composed of sulfurous acid gas generated by the corrosion of food, and it fills the pipe and makes the hollow part of the pipe wall corrode more easily than the flowing water part. Also, due to the structure of sewer pipes, sediment from mud often decomposes in the sewer pipes to generate sulfur dioxide gas, and the demand for acid-resistant concrete pipes is increasing, so we are struggling to take measures against these acid-resistant concrete pipes. Is the current situation.

The present invention relates to an improvement of a concrete pipe provided with such an acid resistant coating, which uses a sheet in which a synthetic resin sheet and a bulky fiber fabric are laminated in advance, and the concrete after molding the concrete pipe is uncured. The bulky fiber fabric is abutted against the concrete surface and pressed to leave the bulky fiber fabric as a water passage in the pipe, leaving a part as a cutout part, and embedding it in the concrete on the other wall surface to cure it. The present invention provides an acid-resistant concrete pipe coated with a synthetic resin sheet, and provides a strongly integrated acid-resistant concrete pipe.

Therefore, a part of the water passages, which are the water passages, refer to the parts that are located downward during the construction piping.

Then, as the synthetic resin sheet used for the acid-resistant concrete pipe, a polyolefin sheet that does not use a plasticizer is suitable, and as the bulky fiber, a non-woven fabric having a high basis weight is suitable, but a pile weave or the like may be used. .

The acid-resistant concrete pipe of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment in which a Hume pipe is coated, and FIG.
The figure shows an example in which a box culvert is coated. (1)
Is a concrete layer, A is a two-layer laminated sheet composed of a synthetic resin sheet (2) and bulky fibers (3), and B is a part of the laminated sheet which forms a water passage.
Is a synthetic resin sheet (2) as shown in the enlarged sectional view of FIG.
And the bulky fiber fabric (3) were integrally laminated in two layers. And this bulky fiber fabric (3) becomes a joint surface with the uncured concrete layer, and it can be pressure-contacted by applying pressure, and as shown in the enlarged cross-sectional view of FIG. 4, the bulky fiber fabric (3) is uncured. The synthetic resin sheet (2) on the surface of the concrete layer (1) bites into the concrete layer and hardens together with the cement matrix.
Formed as a stable acid resistant coating on the inner surface of the.

FIGS. 5 and 6 show an embodiment showing a longitudinal sectional view in the case of being applied to a Huyme tube, and FIG. 5 shows a tube having an effective length 1 from the insertion port to the receiving port. (1) This is an example in which the acid-resistant laminated sheet A is coated on the inner surface, and such coating is usually sufficient, but when considering bending of the pipeline, etc.
It can be said that the embodiment in which the entire inner surface of the concrete pipe (1) from the insertion end (5) to the receiving end (6) (a part of the cutout is left) is covered is more complete.

Since the cutout portion B of the coating layer is a water passage, it is a lower portion when it comes to the construction pipe. This is because the concrete such as sewage has a small amount of rotting because there is a flow, and the upper part is filled with sulfurous acid gas etc. and tends to accelerate rotting, so the acid-resistant concrete pipe of the present invention is suitable as a countermeasure against this. ing.

As described above, the acid-resistant concrete pipe of the present invention has a cutout portion B of the acid-resistant laminated sheet A in the water passage portion, so that the pipe body may be cracked or the joint portion may be bent to prevent external water from leaking. Even when it invades, water is guided downward through the bulky fiber fabric (3) between the synthetic resin sheet (2) and the concrete layer (1) as shown by the arrow and flows down into the water passage, covering the entire circumference of the pipe. Compared with the case, the acid-resistant sheet A floated by this infiltration water is not peeled at all. A tubular body with a circular cross section such as a Hyume tube or a box culvert with a square cross section can be coated in the same manner, and an acid resistant laminated sheet that is a synthetic resin sheet with sufficient acid resistance and a bulky fiber fabric is integrated. Since the bulky fiber fabric surface of A is firmly joined by being embedded in the concrete layer, there is no peeling of the acid resistant layer unlike conventional acid resistant concrete pipes, and a pipe pipe material for modern sewer construction. As a sufficient effect is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the acid-resistant concrete pipe of the present invention in the case of a Huym pipe, and FIG. FIG. 3 is a cross-sectional view of the acid-resistant laminated sheet, FIG. 4 is an enlarged view showing a bonded state, and FIGS. 5 and 6 are embodiment diagrams in the longitudinal direction in the case of a Huym tube. (1) …… Concrete layer (2) …… Synthetic resin sheet (3) …… Bulk fiber fabric

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Ishii 3-3-2 Nishiarai Sakaecho, Adachi-ku, Tokyo (56) References U)

Claims (1)

[Scope of utility model registration request] 1. An upper part of the uncured concrete pipe immediately after molding, which has a partly cut-off part B on the inner surface below the pipe which serves as a water passage for the inside of the uncured concrete pipe, except for the cut-off part B. The laminated sheet A formed in two layers around the entire circumference by previously laminating a synthetic resin sheet and a bulky fiber fabric is used.
The acid-resistant concrete pipe is characterized in that the bulky fiber layer is laminated so as to come into contact with the inner surface of the concrete pipe.