JP5292580B2 - Rust-proofing separator for concrete formwork and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively realize a rustproof specification of a separator including contents of simple work. <P>SOLUTION: A heat-shrinkable tubular covering material 32 with an inside diameter larger than a diameter of the separator is put on a portion away at least by a dimension equivalent to the covering depth of an internal reinforcement from both ends, except a screw portion 31, of the separator 3A for a concrete form, and heated to bring into close contact with each other. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  TECHNICAL FIELD The present invention relates to a rust-proof specification of a steel separator that holds a gap by fixing a mold when constructing a concrete wall or the like, and a manufacturing method thereof.

  When constructing a wall or the like with concrete, it is a common practice to hold the molds on both sides with a steel separator and hold them at a predetermined interval corresponding to the wall thickness. The separator is a steel rod with screws at both ends. An example of the cross section of the wall W under construction is shown in FIG. 3 is a separator, 4 is a coupling fitting called “koban” that is screwed into both ends of the separator, 41 is a plate-like portion thereof, 42 is a cone screwed to the plate-like portion, and 5 is a laminate of the plate-like portion 41 and the formwork. The clip 6 inserted through is a formwork.

FIG. 5 is an explanatory view showing the connection fitting 4 in an exploded state, and FIG. 6 is a perspective view of the assembled state. There is a hole through which the clip is inserted in the center of the plate-like portion 41, one end is provided with a screw inside and outside, the inside screw is screwed into the separator end, and the outside screw is screwed into the cone 42.
After the concrete is hardened, the clip 5 is pulled out, the form 6 is removed, and the connecting metal fitting 4 is removed. As shown in FIG. 7 of the cross-sectional view of the wall in this state, the surface of the wall W is a cone. The hole H remains, and the threaded portions at both ends of the separator protrude into the cone hole H.

  In this state, the appearance is not only bad, but the infant is injured by the screw part, and the surface of the wall W is soiled by the rust generated in the screw part. Conventionally, the cone hole H is manually filled with mortar. It was done. However, this work takes time and is not done carefully, and the appearance becomes unsightly.If the filling is incomplete and there are gaps, the mortar may fall off or water may enter the screw parts. There was a problem that rust was generated, and the rust juice leaked out and soiled the walls.

Patent Document 1 describes a processing plug that is a hole-filling member that deals with such a cone hole H. This is shown in FIG. The main body 11 includes a main body 11 that fills the cone of the cone hole H, and a storage 12 that is covered with the main body 11 at one end and covered with the threaded portion of the separator.
This treatment plug 1 is made of an integrally molded resin, and is pushed into the cone hole H with a finger and lightly hammered with a hammer, so that the storage portion 12 bites into the screw of the separator and adheres to the bottom of the cone hole H at the same time. Will be elastically deformed and tightly attached to the cone hole H, and the hole part will be fixed in a “surface drop” state where it is slightly retracted from the wall surface. In some cases, it is necessary to devise after filling the storage portion 12 with a sealing material such as silicon.

Further, a “long P corn” having a long corn may be used in places such as a coast where there is a concern about salt damage, but this is more expensive than the ordinary connecting metal fitting 4. Further, 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 large, which is disadvantageous in strength.
Furthermore, voids are likely to remain around the cone hole H, and cracks are also likely to occur. If moisture reaches concrete behind the threaded portion of the separator 3 protruding due to such voids or cracks, the moisture may travel through the separator and further penetrate into the concrete, and rust may be generated in the internal rebar. Although it is conceivable that the separator material is stainless steel that does not generate rust, it is not practical in terms of price.

On the other hand, Patent Document 2 describes that the surface of the separator from both ends to at least the vicinity of the position where the reinforcing bar exists is coated with powder coating to make the separator rust-proof. This eliminates the above-mentioned rust problem of the internal rebar, but since powder coating is generally performed by the fluidized dipping method, the separator must be heated to about 200 ° C twice on each side. Since the separator has to be transported to the factory that performs the process, the cost is considerably increased. The same applies to other cases of electrostatic coating and heavy coating.
JP 2005-139719 A Registered Utility Model No. 31286670

  An object of the present invention is to solve the above-mentioned problems, and to realize a rust-proof specification of a separator with simple work and low cost.

The rust-proof specification separator for concrete molds of the present invention has a diameter from the separator to the part from both side ends excluding the threaded part and the parallel part of the concrete mold separators to the dimension that is at least the cover thickness of the internal rebar. The heat-shrinkable tube-shaped coating material having a large inner diameter is also in close contact with each other, and preferably the rust-proofing separator for concrete molds, wherein the coating material is a polyolefin resin. .

Further, the method for producing a rust-proof specification separator for a concrete mold of the present invention is a part from the both end parts excluding the threaded part and the parallel part of the concrete mold separator to at least the dimension of the cover thickness of the internal rebar, A heat-shrinkable tube-shaped coating material having an inner diameter larger than the diameter of the separator is fitted, and the coating material is heated and contracted to adhere to the surface of the separator. Preferably, the method is for producing a rust-proof separator for concrete molds, wherein the coating material is a polyolefin resin.

  According to the present invention, it is possible to achieve the excellent effect of realizing the rust-proof specification of the separator with a simple work content and at a low cost, and improving the aesthetics and performance of the wall body in the Gulf area or the like.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a rust preventive specification separator 3A according to the embodiment. 31 is a threaded portion at both ends, 32 is a covering material, and 33 is a central parallel portion. The parallel portion 33 has a function of preventing co-rotation during demolition or the like by causing the concrete to penetrate.

The covering material 32 is a heat-shrinkable, tube-shaped covering material having an inner diameter larger than the diameter of the separator, which is covered with the separator and heated to be in close contact with the separator. Let L be the length of the covering material.
Such a heat-shrinkable tube is a kind of shape memory resin obtained by heat-treating a resin with a three-dimensional network structure, and is widely used for insulation coating of terminals and connecting parts of electronic parts and wiring. ing. For example, polyolefin resins having various sizes are commercially available and can be easily obtained. The thickness of the tube is not particularly limited as long as it can exhibit a rust prevention function, but it is sufficient that the tube is not damaged when the concrete is placed in wall construction.

FIG. 2 is a partial cross-sectional view of the wall for explaining the length L of the covering material 32. S is an internal reinforcing bar, V is a distance from the surface called the cover thickness to the internal reinforcing bar S, and C is generated in concrete. It is a crack.
The cover thickness V is determined by the Building Standard Law Enforcement Order as 50 or 60 mm or more for an outdoor durable wall, for example. Even if the crack C generated in the vicinity of the cone hole reaches the surface of the separator 3A, the length L of the covering material 32 is at least the thickness of the cover from the bottom of the cone hole. The length corresponding to is required.

  FIG. 3 is an explanatory view for explaining the procedure for heating and shrinking the coating material in the separator of the present invention so as to adhere to the surface of the separator. This is an example, but first, as shown in (a), the connecting metal cone 42 is attached to one end of the separator 3 and vertically placed on a table. Instead of the cone 42, a table with holes may be used. Next, as shown in (b), the heat shrinkable tube 32 having an inner diameter larger than the diameter of the separator is fitted (covered) on the separator 3. Subsequently, as shown in (c), by the dryer D, hot air is sprayed and contracted toward the tube 32 to be brought into close contact with the separator. When the tube is a polyolefin resin, hot air of about 105 ° C. is sufficient, so that a general household dryer can be used. This operation may be performed twice on both sides for each separator.

In addition, the separator 3 fitted with the tube 32 may be inserted into a high-temperature heating chamber and contracted. This is advantageous when the shrinking process is automated, such as by continuously processing with a chain conveyor or the like, or placing it on a pallet and heating it for a certain time.
With such work contents, there is no need to bring it into a special processor, and it can be easily carried out by a separator manufacturer that cuts and screws steel bars, so the material transportation process does not increase and the separator can be manufactured at low cost. Can be made rust-proof.

It is a perspective view which shows the antirust specification separator of an Example. It is a fragmentary sectional view of the wall for demonstrating the length of the coating | covering material in an Example. It is explanatory drawing explaining the procedure which adhere | attaches the coating | covering material in this invention. It is sectional drawing which shows an example of the wall body concerning this invention. It is explanatory drawing which decomposes | disassembles and shows the connection metal fitting concerning this invention. It is a perspective view of the assembly state of the connection metal fitting concerning this invention. It is sectional drawing of the wall which shows the cone hole concerning this invention. It is a perspective view which shows the processing plug of a conventionally well-known cone hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing plug 3, 3A Separator 4 Connecting metal fitting 5 Clip 6 Form 11 (Processing plug) Main body part 12 (Processing plug) Storage part 31 (Separator) Screw part 32 (Separator) Covering material 33 (Separator) Parallel portion 41 (connecting bracket) plate-like portion 42 (connecting bracket) cone C crack D dryer H cone hole L length of covering material S internal rebar V cover thickness W wall

Claims (4)

An inner diameter larger than the diameter of the separator is provided in a portion from both end portions excluding the threaded portion (31) and the parallel portion (33) of the concrete mold separator (3A) to the dimension of at least the cover thickness of the internal reinforcing bar. A heat-shrinkable and tube-shaped coating material (32) having a close contact with the rust-proofing separator for concrete formwork.   The rust preventive separator for concrete molds according to claim 1, wherein the covering material (32) is a polyolefin resin. A heat-shrinkable, tube-shaped coating having an inner diameter larger than the diameter of the separator on the part from both end portions excluding the threaded portion and the parallel portion of the concrete mold separator to at least the dimension of the cover thickness of the internal rebar A method for producing a rust-proof specification separator for concrete molds, characterized in that a material is fitted, the coating material is heated to shrink, and is adhered to the surface of the separator.   The method for producing a rust-proofing separator for concrete molds according to claim 3, wherein the covering material is a polyolefin resin.

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