JP2011256689A - Interval holding rod for concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interval holding rod that maintains at a prescribed interval forms used in a concrete structure which prevent a bar in concrete from corroding due to rusts and salt damage.SOLUTION: After the entire circumference between an interval rod in the middle part of a holding core rod and screw parts at both ends is cleaned with a solvent as the surface treatment, the entire circumference is subjected to blast treatment and base coat treatment to be baked, after which as the top coat a painting coating layer 3 is composed by baking and coating with an epoxy paint and a fluorine paint. The holding core rod is composed of three components: a central core rod 6 and both end core rods 7 at both sides, which are concatenated by a connecting nut 8 so that the length of the central core rod 6 can be determined freely.

Description

  The present invention relates to a concrete formwork spacing retainer called a separator that fixes a formwork at a fixed distance when a concrete structure is constructed.

Conventionally, when constructing a structure such as a wall body by using this type of concrete formwork spacing retainer, the formwork is fixedly supported by a steel round separator and a P-cone and held at a predetermined distance. It is the current situation that is normally implemented.
However, these gap retaining rods are thought to have no direct effect on the structure even if the screw portions at both ends are corroded, but directly to the internal reinforcing bar portion via the inner spacing rod. There is a problem that it corrodes sequentially.
Further, in places such as the coast where there is a concern about salt damage, a “long P corn” having a long corn may be used, which is very expensive as compared with a normal P corn. Since the long P cone is larger in both diameter and length than usual, there is a problem that the concave surface generated in the wall body becomes very large and disadvantageous in strength.
Furthermore, voids are likely to remain very much around the hole of the cone, and cracks are also likely to occur. There is also a problem that when water reaches the concrete behind the threaded portion of the separator protruding due to such voids and cracks, the moisture propagates through the separator and further penetrates into the concrete to cause rust in the internal rebar.

  Utility model registration No.31.8670   Utility Model Registration No. 3155622

According to iron separators for concrete formwork that are generally used in the past, those using polyethylene resin as a powder coating, or spray coating of silicon resin paint as a rust preventive agent, soaking coating and cationic electrodeposition A silicon resin coating layer is applied by coating, and the entire holding core body is spray-coated with epoxy resin paint or fluororesin paint as a rust preventive agent. The thing which coat | covered the coating layer is known.
With the conventional antiseptic coating methods described above, the hardness of the surface is very insufficient, and the thin surface makes it easy to cause damage and wear from scratches and rust, thus blocking the metal surface from the air. There is a problem that it is impossible to prevent long-term rust resistance and corrosion resistance due to deterioration of function, corrosion due to weathering and external damage, and the like.
Therefore, the present invention has solved the above-mentioned problems that are the disadvantages, and the main object is to provide a solvent for the ground treatment on the entire outer periphery of the spacing rod of the holding core rod and the screw portions at both ends. After degreasing, the entire outer periphery is blasted and base-coated and baked, and as an overcoat, epoxy paint and fluorine paint are applied to protect the internal reinforcing bars and prevent corrosion by rust. In addition, an object of the present invention is to attach a connection nut that can freely and inexpensively change the length of the spacing rod of the holding core rod and can easily replace the length of the spacing rod.

In order to achieve the above-mentioned object, according to the concrete mold spacing retainer in the present invention, the entire outer periphery of the spacing collar in the center of the retaining core and the screw portions at both ends is baked, and an epoxy-based coating is applied to the surface thereof. And the coating layer by baking painting of a fluorine-type paint is applied.
In addition, the coating coating layer is effectively applied only to both ends excluding the central portion where there is little damage such as rust of the spacing rod of the holding core rod.
In addition, three parts, a central core that can be freely selected between the length and length of the holding core, and both end cores that are used for connection on the left and right sides, are connected by connecting nuts, and the outer periphery of only the left and right end cores is connected. A paint coating layer is deposited.

According to the space holding cage for concrete molds of the present invention, the hardness is insufficient and the surface is easily damaged and worn due to the thin wall like the conventionally used silicone resin and polyethylene. It has the effect of completely preventing deterioration by securing the rust and water blocking properties by blocking the surface and air.
And the thing of this invention is solvent-degreasing and baking as a base treatment with respect to the outer periphery of the space | interval space | interval ridge | interval of the holding core rod, and the screw part of both ends, and after that, an epoxy-type paint and a fluorine-type paint as top coat Since the entire outer periphery is baked and coated, the surface becomes thick and the strength is improved, and rust and corrosion due to salt damage and the like can be sufficiently prevented.
In addition, since the coating coating layer in which only the both ends of the spacing cores of the holding cores are baked and coated is applied and the intermediate part which is not damaged by rust or the like is not coated, the holding cores can be provided at low cost.
Furthermore, by connecting the central core in the middle part of the holding core and the cores for connecting both ends with connecting nuts, the long and short cores in the middle central core can be freely adjusted to the concrete thickness. On the other hand, there is a convenient effect that both ends can be selected, and the both end cores for connection can be used freely at all times by the connecting nuts at both ends. In addition, according to the holding core of this invention, there exists a remarkable effect as rust prevention and water-stopping of an underground structure, a water purification plant, a sewage treatment plant, a sewage purification tank, a water tank, etc.

  It is the vertical side view which used the holding core of the present invention for the concrete formwork.   It is a vertical side view of the holding core of the present invention.   It is sectional drawing of FIG. 2A-A line of this invention.   It is sectional drawing of FIG. 2B-B line of this invention similarly.   Similarly, it is a side view in which only the spacing rods of the holding core rods of the present invention are partially removed without applying a coating coating layer.   It is sectional drawing of CC line of FIG. 5 of this invention.   Similarly, the holding core rod of the present invention is a side view in which an intermediate central core rod and left and right connecting core rods are connected by a connection nut.   It is a perspective view of the center core of FIG. 7 of the present invention.   It is a slope view of the connection nut of the present invention.   It is a perspective view of the both-ends core for connection of this invention.

Since the holding core of the present invention is configured as described above, it is attached together with vertical and horizontal reinforcing bars in a concrete formwork, and completely prevents corrosion caused by rust and salt damage caused by a holding core for iron spacing. It is.
In the present invention, when the concrete wall is thick, when it is considered that the concrete wall does not corrode, a part of the spacing rib of the holding core rod is used in a state where no coating coating layer is formed.
If the holding core is divided into three parts, the central core and the left and right connecting cores, select only the length of the central core corresponding to the concrete thickness. It is what you use.

The embodiment will be described with reference to the drawings. In the embodiment of FIGS. 1 and 2, the holding core (1) for supporting the formwork (15) (15) of concrete (14) generally called a round separator is It is made of a metal such as iron in which a partition groove (11) (11) is formed between the center gap (2) and the screw portions (4) (4) at both ends of the gap (2). Yes.
Then, the retaining core (1) is subjected to solvent degreasing on the entire outer periphery as a ground treatment for rust prevention. Further, after the holding core rod (1) is baked and baked on the entire outer periphery of the gap rod (2) and the screw portions (4) and (4) at both ends, the base coat (zinc phosphate system) is baked. As a top coat top coat, an epoxy paint and a fluorine paint are baked.
In addition, as a coating method, a dip & spray method, cationic electrodeposition coating, electrostatic powder coating, spray coating, and soaked coating are used. The top coat may be applied twice.
Further, in the embodiment shown in FIG. 5, the predetermined dimension of the gap ridge (2) at the intermediate portion of the holding core ridge (1) is unpainted and includes the external screw portions (9) and (9) at both ends. Only the outer periphery is coated with the coating layers (3) and (3) by baking to the required thickness.

Next, in the embodiment shown in FIGS. 7 to 10, the holding core (1) has an intermediate central core (6) and both ends of the central core (6) for connection. It is divided and formed from three parts including the core rod (7) and (7). The central core (6) is engraved with external screw portions (9) and (9) at both ends, and the outer periphery is not coated with a paint coating layer (3) by baking. A central core rod (6) of a cocoon or a short cocoon can be used freely.
Further, the connecting cores (7) and (7) connected to both ends of the central core (6) have screw portions (4) and partition grooves (11) at the ends and external ends at the other ends. The screw portion (10) is engraved, and the entire outer periphery thereof is baked, and then a paint coating layer (3) is applied as a top coat by baking an epoxy-based paint and a fluorine-based paint. In the connecting nut (8) shown in FIG. 9, an inner screw portion (5) is engraved inside, and the outer screw portion (9) of the central core rod (6), which can be freely selected in length, and both end cores The outer thread portion (10) of the flange (7) is used by being screwed together. Reference numeral (12) is a reinforcing bar, and reference numeral (13) is a cap.

DESCRIPTION OF SYMBOLS 1 Holding core rod 2 Space | interval rod 3 Paint coating layer 4 Screw part 5 Inner screw part 6 Center core rod 7 Both ends core rod 8 Connection nut 9, 10 Outer screw part 11 Partition groove 12 Reinforcing bar 13 Cap 14 Concrete 15 Formwork

Claims (3)

  The holding core rod (1) for holding the concrete formwork is integrally formed with screw portions (4) (4) and partition grooves (11) (11) at both ends of the spacing rod (2). Solvent degreasing is performed on the entire outer periphery of (1) as a base treatment, and the holding core rod (1) is blasted to the entire outer periphery of the spacing rod (2) and the screw portions (4) and (4) at both ends. A concrete characterized in that it is baked by treatment and base coat treatment, and then the holding core (1) is coated with a paint coating layer (3) by baking of an epoxy paint and a fluorine paint as an overcoat. Spacing retainer for formwork.   2. The space holding rod for concrete formwork according to claim 1, wherein the space rod (2) of the holding core rod (1) is coated with a coating layer (3) (3) only at both ends excluding the intermediate portion. .   The holding core rod (1) is divided into three parts, a central core rod (6) and left and right connecting core rods (7) and (7), and the center without the coating coating layer (3) being attached. A core rod (6) and the both-end core rods (7) (7) coated with the coating coating layer (3) are integrally connected by connecting nuts (8) (8). Item 1. A space retaining rod for concrete formwork according to Item 1.

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