JPH0932095A - Manufacture of deformed concrete manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a special manufacture obtained by changing some specifications of a standard manufacture without remodeling a formwork. SOLUTION: A reinforced concrete base material which is the same as or larger than a standard manufacture is cut to form a reinforced concrete member 2 of a desired form, and rusting preventing material is applied to the part of the end surface of a reinforcement bar 4 exposed on the cut surface 3 of the reinforced concrete member 2. Further, a layer 6 of an adhesive agent mainly composed of resin having redispersibility to water and a layer 7 of mortar material to which resin having redispersibility to water is added are sequentially formed on the rusting preventing material applied part 5 and the cut surface 3 of the reinforced concrete member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deformed concrete product, and more particularly to a method for manufacturing drainage gutters, retaining walls, fume pipes and the like having shapes different from those of standard products.

[0002]

2. Description of the Related Art Conventionally, concrete products are manufactured with iron molds corresponding to the types of products, and one mold is used to manufacture almost one product. In actual manufacturing, there is a limit to the cost of the formwork and its storage location.Therefore, when manufacturing a product with a special shape that is partly changed from the standard product, do not increase the number of formwork as much as possible. , The existing formwork is dealt with by adding modifications such as dimensional changes and shape changes.

[0003]

However, according to the conventional method as described above, when a large size change or shape change of the form is performed, the form is moved to its own form factory or form manufacturer. Since it has to be modified, it often takes time, labor and cost. Further, since the mold cannot be used while the size and shape of the mold are being changed, the productivity is lowered. Furthermore, welding of iron parts,
There are various problems that the cutting deteriorates the mold and shortens the service life of the mold.

[0004]

The present invention has been made to solve the above-mentioned conventional problems, and some specifications of standard products have been changed without modifying the formwork. It is intended to provide a method of manufacturing a product having a special shape, and its gist is to cut a reinforced concrete base material which is the same as or larger than a standard product to form a reinforced concrete member having a desired shape. On the other hand, a rust preventive material is applied to the end face portion of the reinforcing bar exposed on the cut surface of the reinforced concrete member, and further on the cut part of the rust preventive material and the cut surface of the reinforced concrete member, in water. On the other hand, a method for producing a deformed concrete product characterized by sequentially forming a layer of an adhesive containing a resin having redispersibility as a main component and a layer of a mortar material to which a resin having redispersibility in water is added. is there.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A reinforced concrete base material which is the same as or larger than a standard product is manufactured in advance, and this is cut with a cutter to form a reinforced concrete member having a size and shape according to a request. At that time, if reinforcing reinforcing bars, aggregates, etc. are exposed on the cut surface, some defects will occur, so apply a rust preventive material to the end surface of the reinforcing bar exposed on the cut surface. A layer of an adhesive containing a resin having redispersibility in water as a main component in the portion where the rust preventive material is applied and the cut surface of the reinforced concrete member, and redispersion in water on the layer of the adhesive. A layer of mortar material to which a resin having properties is added is sequentially formed.

[0006]

[Embodiment 1] Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 is a reinforced concrete drainage base material having a total length of 800 cm, which is larger than the standard, and is manufactured in advance. , Cut it with a diamond cutter on both end faces 1A, 1A and parallel to each other,
Drains with different length and shape from standard products, that is, drains 2A and 2B with lengths of 150 cm and 300 cm, respectively.
And the length of one side wall cut by the end face 1A and the surface of 30 ° is 1
90 cm, drainage groove 2C with other side wall length of 160 cm,
The remaining drainage grooves 2D are formed respectively.

As shown in FIG. 2, the cut surface 3 of the drainage grooves 2A to 2D by the cutter is inferior, and therefore, the cut surface 3 is washed with a brush to remove dust and the like, and the cut surface 3 is naturally removed. After drying, a rust preventive agent is applied to a portion of the end face of the reinforcing bar 4 exposed on the cut surface 3 by a resin application spatula or the like to form a rust preventive agent application portion 5. As the rust preventive agent used here, one having an epoxy resin as a main component, for example, ThreeBond 2086 (manufactured by ThreeBond Co., Ltd.) was used.

By forming the coating portion 5 of the rust preventive agent, the reinforcing bar 4 is prevented from coming into contact with moisture and the outside air, and the oxidation reaction is less likely to occur. As the rust preventive agent, in addition to the epoxy resin, those having an acrylic or polyurethane resin as a main component can also be used, but particularly when an epoxy resin is used, rust is generated. The rate was low.

Next, an adhesive layer is applied to the entire surface of the cut surface 3 of each of the drainage grooves 2A to 2D by applying a brush to form an adhesive layer 6. At this time, if the brush is applied immediately after the rust preventive agent is applied, the rust preventive agent application part 5 may be removed. Wait until the rust preventive agent application part 5 is cured to some extent. Do it later. In this case, the adhesive layer 6 does not come into direct contact with the cut surface 3 in the rust-preventive agent application portion 5, but the proportion of the rust-preventive agent application portion 5 in the total area of the cut surface 3 is large. Since it is extremely small, the adhesive layer 6 firmly adheres to the cut surface 3 and does not peel off.

The adhesive used here is mainly composed of an ethylene vinyl acetate copolymer having redispersibility in water, for example, the Onoda effect (manufactured by Onoda Co., Ltd.). The layer 6 of this adhesive is applied to each drainage channel 2A-2
By forming the cut surface 3 of D, it is possible to prevent water absorption and water permeation of the poor cut surface 3 and to improve the adhesiveness between the cut surface 3 and the layer 7 of the mortar material described later.

In particular, by forming the adhesive layer 6, the contact of the reinforcing bars 4 with moisture and air is greatly reduced, and the rapid progress of oxidation is hindered.
It is possible to prevent the concrete member from being deformed or cracked due to water ingress into A and 2D. As an adhesive,
In addition to those containing the ethylene-vinyl acetate copolymer as a main component, there are vinyl acetate vinyl versatate and an aqueous emulsion containing an acrylic powder resin as a main component.

Further, as a surface finish, a mortar material of the formulation example shown in Table 1 was applied on the previously applied adhesive layer 6 to form a mortar material layer 7. In particular, in order to improve the adhesive strength of the previously formed adhesive layer 6 with the mortar material, an ethylene vinyl acetate copolymer having redispersibility in water, such as movinyl powder [Hoechst Synthesis] Co., Ltd.), vinyl acetate vinyl versatate, acrylic resin powder resin, or the like was added. By mixing the powder resin, the mortar material layer 7 strongly adheres to the adhesive layer 6 being cured, and peeling after drying is less likely to occur.

In addition, in order to have a viscosity that is easy to work and sufficient curability, a methyl cellulose powder and a calcium aluminate-based quick-setting agent such as calcium sulfaluminate or calcium aluminate, for example, Onoda Y- By mixing LOCK [manufactured by Onoda Co., Ltd.] and a water reducing agent [Mighty 100, manufactured by Kao Co., Ltd.], evaporation of water during curing is suppressed, and the hydration reaction of the cement proceeds efficiently and quickly. To do.

As a result, the cement is hardened sufficiently, cracking and deformation of the mortar material layer 7 are unlikely to occur, and a clean decorative surface is obtained. In addition, when the temperature is relatively warm (about 2
(0 ° C or higher), the mortar material begins to harden in less than 5 minutes. At that time, in order to improve workability, a retarder composed of an organic acid such as an aliphatic oxycarboxylic acid, for example, citric acid is added to cure the mortar material. Adjust the speed.

[0015]

[Table 1]

In forming the layer 7 of mortar material,
If the previously applied adhesive hardens too much, the adhesiveness will deteriorate, so application of the mortar material starts at a time when the surface of the adhesive layer 6 is slightly hardened (about 30 minutes after the adhesive application). Good to do. After applying the mortar material, about 15 ~
Since the surface of the mortar material layer 7 is hardened to some extent in about 20 minutes, the mortar material is further applied at that time to form the mortar material layer 7 having a uniform surface. Then, when the layer 7 of the mortar material has further hardened to some extent (after drying for about 15 to 20 minutes), unnecessary mortar material is scraped off with a caulking spatula or the like,
A product was obtained by finishing as shown in FIG.

Through the above-mentioned working steps, the drain groove having the required size or shape can be manufactured without modifying the mold. This drainage groove is unlikely to cause cracks or defects on the cut surface, and rust on the reinforcing bar portion was also less likely to occur. In addition, the product is
Over the long term, internal and external defects are unlikely to occur and the durability has been improved.

[0018]

[Embodiment 2] FIG. 4 shows another embodiment, which is different from Embodiment 1 in that a step of applying a rust preventive agent to form a coating portion 5 of the rust preventive agent In this method, the steps of forming the agent layer 6 are performed in the reverse order. That is, first, the entire surface of the cut surface 3 of the drainage grooves 2A to 2D is brushed with an adhesive to form an adhesive layer 6, and then the adhesive layer 6 is formed on a portion corresponding to the end face of the reinforcing bar 4. In the case of the above-mentioned embodiment, a rust preventive agent is applied from above with a spatula for resin application to form a rust preventive agent application part 5 and thereafter the rust preventive agent application part 5 is not cured. A layer 7 of mortar material is formed in the same manner as in.

With such a structure, the adhesive layer 6 is formed in direct contact with the entire surface of the cut surface 3, and the mortar material layer 7 is formed with the rust preventive agent coating portion 5 and the adhesive. Is formed in direct contact with layer 6 of. In particular, by forming the mortar material layer 7 before the rust-preventive agent-applied portion 5 is cured, the adhesiveness at this contact site is also stabilized. Therefore, the adhesion of the mortar material layer 7 to the cut surface 3 is very good, and the peeling phenomenon hardly occurs. Further, since the next process can be performed without waiting for the hardening of the rust preventive agent coating portion 5, the work can be performed quickly.

[0020]

EFFECTS OF THE INVENTION Since the method for manufacturing a deformed concrete product according to the present invention has the above-described structure, (1) the work of the formwork is not performed without changing the dimensions and shape of the formwork. It is possible to reduce the time and labor and the cost required for it. (2) Extra reinforced concrete base materials are stocked in advance, and can be delivered in a batch by cutting them arbitrarily and repairing the cut surface, so there is no need to prepare a large number of molds and productivity is improved. Can be raised. In particular, as for the production of custom-made products, the applicable range is widened and the production can be performed in a short time. (3) Since the dimensions and shape of the formwork are not changed, deterioration and defects of the formwork are unlikely to occur, and long-term use is possible, and the number of formwork can be suppressed, and the formwork can be used. Since the number of years of use of the is extended, the cost required there is also reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method for cutting a drainage ditch base material made of reinforced concrete larger than a standard product.

FIG. 2 is a front view of the cut surface before repair.

FIG. 3 is an enlarged vertical cross-sectional partial view of a cut surface portion manufactured by the method of the present invention.

FIG. 4 is an enlarged vertical sectional partial view of another embodiment of the cut surface portion manufactured by the method of the present invention.

[Explanation of symbols]

 1 Base material for drainage groove made of reinforced concrete 1A End surface 2A Variant drainage groove 2B Variant drainage groove 2C Variant drainage groove 2D Variant drainage groove 3 Cut surface 4 Reinforcing bar 5 Corrosion inhibitor application part 6 Adhesive layer 7 Mortar material layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Watanabe 6-7 Uehonmachi, Sakata City, Yamagata Prefecture, Central Research Laboratory, Maeda Pipe Manufacturing Co., Ltd. 15 Maeda Seikan Co., Ltd. Head Office Factory (72) Inventor Shinji Noguchi 32 Kitahara, Takashimizu-cho, Kurihara-gun, Miyagi Prefecture OMI Co., Ltd.

Claims (2)

[Claims] 1. When a reinforced concrete base material which is the same as or larger than a standard product is cut to form a reinforced concrete member having a desired shape, the end face portion of the reinforcing bar exposed on the cut surface of the reinforced concrete member is also cut. A rust preventive material is applied, and a layer of an adhesive containing a resin having redispersibility in water as a main component, and water on the applied part of the rust preventive material and the cut surface of the reinforced concrete member. A method for producing a deformed concrete product, which comprises sequentially forming layers of a mortar material to which a resin having redispersibility is added. 2. When a reinforced concrete base material which is the same as or larger than the standard product is cut to form a reinforced concrete member having a desired shape, redispersibility in water is exhibited on the cut surface of the reinforced concrete member. When a layer of an adhesive containing a resin having as a main component is formed and a rust preventive material is applied to a portion of the cut surface corresponding to the end face of the rebar, the adhesive layer and the rust preventive material On the application part,
A method for producing a deformed concrete product, which comprises forming a layer of a mortar material to which a resin having redispersibility in water is added.