JPH03230908A - Manufacture of corrosion resistant composite concrete product - Google Patents

Abstract

PURPOSE:To enable the corrosion resistant composite concrete product with its stable outer diameter-dimension to be effectively produced by a method in which kneaded material is extruded in the space between a lining member and a molding die, and the kneaded material and the lining member an integrally molded by said extrusion force, thereby producing the composite concrete object, and then it is pushed out forward. CONSTITUTION:The lining member 6 of tubular shape, U shape or flat plate-shape which has a number of the ribs 6' for fixing concrete on its outside and is made of synthetic resin is inserted into the molding die of the extrusion molding machine 1 which has the molding die 4 of the same shape as that of the lining member and then is set therein. From said extrusion molding machine, the kneaded part 8 which contains cement and aggregate as main raw material is extruded in the space between the lining member and the molding die, and be said extrusion pressure, the kneaded material and the lining member are integrally molded into a composite concrete object and then it is pushed out forward. Then the cement group-kneaded material 8 is cured by conventional method, whereby the composite concrete object 7 in which the lining member is integrally fixed onto its inner surface is obtained. By this producing method, while the kneaded material is uniformly laminated on the outside of the lining member, they are firmly bonded mutually by the ribs for fixing the concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing corrosion-resistant composite concrete products, specifically concrete pipes (buried pipes) whose inner surfaces are covered with synthetic resin lining members, side gutters, flat plates, etc.

(Prior art) Concrete products generally do not have acid resistance, and in particular, concrete pipes and gutters used for sewer pipes are exposed to sulfur dioxide gas and sulfur, which are generated due to the acidity of the sewage flowing inside the pipes, and due to chemical reactions from the sewage. The pipes are eroded by hydrogen gas, become tattered, buckled by earth pressure, etc., and cause problems such as road surface depression.

To solve this problem, composite concrete pipes and gutters have been developed in which the inner surface of concrete pipes and gutters are coated with a synthetic resin material. The method of manufacturing the composite concrete pipe, gutter, and flat plate is by vibration forming.

(Problems to be Solved by the Invention) In the conventional manufacturing method described above, inner and outer molds are required, and the molds must be assembled and disassembled each time a molded product is manufactured, which is time-consuming and difficult to manufacture. The problem is that it is difficult to improve sexual performance.

The present invention has been made in view of the problems of the prior art described above, and its object is to provide a tubular or U-shaped material made of synthetic resin with a large number of concrete-fixing ribs on the outer surface. , or a flat lining member,
It is inserted into the molding die of an extrusion molding machine that has a molding die of the same shape as the lining member, and from the extrusion molding machine, a kneaded material mainly made of cement and aggregate is mixed into the space between the lining member and the molding die. The mixture and lining material are combined by the extrusion pressure to form a composite concrete product and extruded forward, and then cured in a conventional manner to solidify the cement mixture, and the lining material is formed on the inner surface. It is characterized by obtaining a composite concrete product that is fixed in one piece.

When the lining member is tubular, the concrete fixing ribs provided on the outer surface of the synthetic resin lining member are provided radially parallel to the axis of the tubular body, and the fixing ribs have an approximate cross-sectional shape. It has a T-shape to ensure a strong bond with the kneaded material.

Further, the tubular lining member may be either an integrally extruded tube or a tube formed by joining a plurality of members together along the circumferential direction, and its material may include, for example, hard vinyl chloride resin, hard polyethylene, hard polypropylene, etc. Can be mentioned.

When the lining member is U-shaped, ribs are formed parallel to the long plane direction on the outer surface of the lining member, and ribs are formed parallel to one side of the lining member when the lining member is flat. .

The kneading condition of the kneaded product made of cement and aggregate as main raw materials shall be hard, so that the shape is stable in the extruded state, and the lining member is moved together by the extrusion pressure. Further, synthetic fibers, inorganic fibers, etc. may be appropriately kneaded in the above-mentioned kneaded material, and in this case, the form of the fibers is preferably a single fiber that does not interfere with extrusion molding.

Further, the synthetic resin lining member may remain in the form described above, but reinforcing reinforcing bars may be assembled on the outside of the member in the axial direction, or in the axial and circumferential directions.

Further, both ends of the synthetic resin lining member are not limited to a straight shape, and may optionally be bent outward at a substantially right angle to have a protruding edge.

The curing method for the composite concrete product may be either room-temperature curing by leaving it to stand naturally, or curing by heating and humidification.

(Function) According to the above means, the lining member inserted into the molding die of the extrusion molding machine so as to partially face the molding die is pulled together by the extrusion pressure of the kneaded material extruded from the extrusion molding machine. The kneaded material is moved forward in the molding die, and the kneaded material is evenly layered on the outside of the lining member, and is firmly connected by concrete fixing ribs to produce a composite concrete product.

(Effects of the Invention) The method for producing a corrosion-resistant composite concrete product of the present invention is to prepare a tubular, U-shaped, or flat lining member made of a synthetic resin and having a large number of concrete fixing ribs on the outer surface of the lining member. is inserted into the molding die of an extrusion molding machine that has a molding die of the same shape as the molding die, and from the extrusion molding machine, a kneaded material mainly made of cement and aggregate is placed in the space between the lining member and the molding die. Extrusion is performed, and the extrusion pressure combines the kneaded material and the lining member to form a composite concrete product, which is extruded forward.Then, the cement-based kneaded material is solidified by curing in a conventional manner, so the outer diameter dimension It is possible to provide a method for efficiently manufacturing stable products.

In addition, by mixing synthetic fibers, inorganic fibers, etc. into the cement mixture that is laminated on the outer surface of the synthetic resin lining member and extruding it, the strength of the concrete product can be reinforced and the bending strength and impact strength can be increased. Improved composite concrete products can be manufactured efficiently.

Furthermore, if the above-mentioned synthetic resin lining member has an outwardly bent protrusion on its side end, the end of the concrete pipe or the edge (end face) of the U-shaped gutter may also be made of synthetic resin material. Coated composite concrete products can be manufactured efficiently.

It should be noted that it is not possible to integrally obtain this edge covered with a synthetic resin lining member by conventional vibration molding, and the protruding ends of the synthetic resin pipe that protrude from both ends of the concrete pipe are heated during post-processing. Although it is possible to do this by bending the pipe, it is not possible to integrate it with the end of the concrete pipe.

(Example) Hereinafter, examples of the present invention will be explained based on the drawings. Fig. 1 shows a manufacturing apparatus used to carry out the present manufacturing method regarding concrete pipes, and in the figure, 1 is a kneading and extrusion of cement-based raw materials. A molding machine, 2 is a raw material input hopper of the extrusion molding machine, 3 is a part of the extrusion screw of the extrusion molding machine, 4 is a molding die, 5 is a pallet for receiving molded products, 6 is a synthetic resin lining for the inner surface of a concrete pipe The lining member 7 is a composite concrete product in which a synthetic resin lining member 6 extruded from a die 4 and a concrete pipe are combined.

The kneaded material kneaded and extruded by the kneading extrusion molding machine 1 is made mainly of cement and sand as aggregate, with short fibers such as synthetic fibers and inorganic fibers mixed as reinforcing materials as necessary. , kneaded into a hard dough and extruded.

On the other hand, a lining member 6 made of synthetic resin that moves through the center of the molding die 4 of the extrusion molding machine 1 is formed into a tubular shape with a predetermined diameter using hard vinyl chloride resin with high corrosion resistance. Concrete fixing ribs 6' are provided radially projecting from the outer peripheral surface of the member in parallel with the axis.

The above-mentioned concrete fixing rib 6'' is for strengthening the connection with the concrete pipe extruded and laminated on the outside of the lining member, and has a T-shaped cross section.

The synthetic resin lining member 6 formed as described above is
The extrusion molding machine 1 is inserted and set by aligning its center with the center of the molding die 4 using the front and rear support rings 9°9' provided on the extrusion molding machine 1, and the outer circumferential surface of the synthetic resin lining member 6 and the inner circumferential surface of the die 4 are aligned. A space into which the cement-based kneaded material is extruded is defined between the two.

Then, the synthetic resin lining member 6 has its tip facing into the molding die 4, and when the extruder 1 extrudes the cement-based kneaded material 8 into the molding die 4, the cement-based kneaded material 8 is It is pushed out into the space between the outer surface of the lining member 6 and the inner surface of the molding die 4 and is laminated on the lining member 6, and the lining member 6 is moved forward of the molding die 4 together.

Cement-based kneaded material 8 is then integrally laminated with uniform thickness on the outer peripheral surface of lining member 6, and after lamination, the composite concrete pipe is obtained by curing and solidifying the cement-based kneaded material.

Regarding the above manufacturing method, if the synthetic resin lining member 6 supplied to the molding die 4 of the extrusion molding machine 1 has projecting edges projecting in the radial direction at both ends thereof, the lining It is possible to integrally cover the end face of a concrete pipe that is laminated and integrated on the outside of the member 6. In this case, the lining member 6 is transferred to the extrusion molding machine 1.
The structure for supporting the tubular lining member so as to be movable inwardly supports the inner surface of the tubular lining member, since the means for supporting the outer surface using the support rings 9, 9' in the previous embodiment cannot be used.

Although the above description has been made for the case of concrete pipes, this manufacturing method can also be used for manufacturing U-shaped gutters as shown in FIG. 3 and flat plates as shown in FIG. 4.

In the case of the U-shaped gutter shown in Fig. 3, a synthetic resin lining member 10 is formed into a U-shape, and concrete fixing ribs 1G' protrude in parallel along the longitudinal direction on the outer surface of the lining member 10. The lining member 10 is inserted and set into a molding die 4 of the same shape connected to the extrusion molding machine 1 with the upper opening facing downward (inverted U-shape), and the above-mentioned procedure is carried out below. By performing the same operations as in the example, a concrete gutter 11 having the lining member 10 integrally bonded to the inner surface can be manufactured.

Further, in the case of the flat plate shown in FIG. 4, the synthetic resin lining member 12 is formed into a flat plate shape, and concrete fixing ribs 12° are protruded in parallel on one side (back side) of the flat plate. The lining member 12 is inserted and set into the molding die 4'' with the lining member 12 facing upward, and the cement-based mixture 8 is then extruded in the same manner as in the previous embodiment to form a predetermined amount of the cement-based mixture 8 on the flat lining member 12. It can be laminated to a certain thickness and can be integrated to produce corrosion-resistant composite concrete slabs.

1. A perspective view showing the outline of the equipment used to carry out the method, Figure 2 is a cross-sectional view of the manufactured composite concrete pipe, Figures 3 and 4 are
The figure is a perspective view showing another embodiment.

In the figure, 1: Extrusion molding machine 6: Synthetic resin lining member 6”: Rib for fixing concrete

Claims (3)

[Claims] (1) Molding a tubular, U-shaped or flat lining member made of synthetic resin with a large number of concrete-fixing ribs on the outer surface using an extrusion molding machine equipped with a molding die of the same shape as the lining member. The extrusion molding machine extrudes a kneaded material mainly made of cement and aggregate into the space between the lining member and the molding die, and the extrusion pressure unites the kneaded material and the lining member. and extrude it forward as a composite concrete product, and then
A method for manufacturing a corrosion-resistant composite concrete product, which comprises curing and solidifying a cementitious mixture using a conventional method to obtain a composite concrete product having a lining member integrally fixed to the inner surface. (2) The method for producing a corrosion-resistant composite concrete product according to claim (1), wherein the kneaded material contains synthetic fibers, inorganic fibers, etc. (3) The method for manufacturing a corrosion-resistant composite concrete product according to claim (1), wherein the synthetic resin lining member has both ends bent outward so as to cover the ends of the concrete layers to be laminated.