JP3124727U - Concrete spacer - Google Patents

Abstract

Provided is a concrete spacer which is easily and surely attached to a reinforcing bar and which is firmly fixed to the reinforcing bar and does not move during concrete placing.
A concrete spacer 10 for securing a gap between a reinforcing bar 12 and a mold 11 arranged in a mold 11, which is made of cement solid or resin solid, and the inside of the mold 11 and the reinforcing bar. 12 is fixed to the rear portion of the spacer main body 13, the reinforcing bar abutting member 15 having a bent portion 14 fixed to the rear portion of the spacer main body 13 and protruding downward and bendable rearward. And a binding wire 16 protruding on both sides of the rear portion of the spacer body 13.
[Selection] Figure 1

Description

The present invention relates to a concrete spacer that is attached to a gap between a reinforcing bar and a formwork and is used for covering management of the reinforcing bar when reinforcing the reinforcing bar in a reinforced concrete structure.

In the construction site of a reinforced concrete structure, it is necessary to stably support a reinforcing bar which is a framework of the concrete structure to be assembled by a concrete spacer and to secure a covering thickness of the cast concrete with respect to the reinforcing bar. For this reason, in the past, an iron spacer was attached to the reinforcing bar to secure the distance between the reinforcing bar and the formwork. However, with the iron spacer, a part of the spacer that was in contact with the formwork after construction was exposed, and from that part Since corrosion enters the reinforcing bar, for example, as described in Patent Documents 1 and 2, a reinforcing bar spacer using a block made of concrete has been proposed.

Japanese Patent Laid-Open No. 2000-145041 JP 2005-307513 A

However, these rebar spacers are complicated in structure and require time and labor for production and installation, and are not sufficiently fixed to the rebar, and the position is shifted or dislodged during concrete placement. For this reason, standardized fog may not be secured.
The present invention has been made in view of such circumstances, and an object thereof is to provide a concrete spacer that is easily and reliably attached to a reinforcing bar and that is firmly fixed to the reinforcing bar and does not move during concrete placement. To do.

The concrete spacer according to the first device for the purpose is a concrete spacer for securing a gap between a reinforcing bar arranged in a mold and the mold,
A spacer main body made of cement solid or resin solid, and disposed between the inside of the mold and the reinforcing bar,
A reinforcing bar abutting member fixed to the rear part of the spacer body, having a bent portion that protrudes downward and can be bent backward;
A binding wire fixed to the rear portion of the spacer body and projecting to both sides of the rear portion of the spacer body.

Here, the cement solid refers to mortar or concrete using cement as a binder, and the resin solid refers to a solid using a resin instead of cement or a solid of a single resin. The binding wire includes, for example, an iron wire, a galvanized iron wire, a metal wire made of aluminum or an aluminum alloy, a string-like object made of natural fiber or synthetic fiber, and the like.
In addition, although the case of a single reinforcing bar may be sufficient, the case of two places will become more stable when the case of a large diameter reinforcing bar etc. is considered.

The concrete spacer according to the second invention is the concrete spacer according to the first invention, wherein the reinforcing bar contact member is made of an iron plate, and the binding wire is made of a metal wire that can be easily bent.

A concrete spacer according to a third device is the concrete spacer according to the second device, wherein the binding wire is fixed or held on the iron plate, and the iron plate is formed by a plurality of pin members penetrating the iron plate, thereby the spacer main body. It is fixed to.

A concrete spacer according to a fourth device is a concrete spacer according to the second and third devices, wherein the iron plate is symmetrically connected to a rectangular portion attached to a rear portion of the spacer body and a central lower portion of the rectangular portion. The width of the lower end of the bent portion is the same as the length obtained by subtracting the width of the upper end of the bent portion from the width of the rectangular portion.

The concrete spacer which concerns on 5th invention is a concrete spacer which concerns on 2nd-4th invention, The round hole is provided in the upper end of the said bending part, The said bending part is easy to bend | fold at the upper end.

The concrete spacer which concerns on 6th invention is the concrete spacer which concerns on 2nd-5th invention, The length of the said binding wire exists in the range of 15-40 cm on one side (more preferably, 15-25 cm on one side).

And the concrete spacer which concerns on a 7th invention is a concrete spacer which concerns on the 2nd-6th invention, The said binding wire is a dull iron wire.

The concrete spacer according to the present invention does not corrode from the exposed portion of the concrete spacer in contact with the formwork or the like after construction because the spacer body is made of cement solid or resin solid.
In addition, it is attached to the reinforcing bar using binding wires protruding on both sides of the rear part of the spacer body, and the concrete spacer is also supported by the bent part protruding below the spacer body. There is nothing to do.
And since this concrete spacer has a simple structure, it can be manufactured at low cost.

Subsequently, an embodiment of a concrete spacer according to the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
1A is a perspective view showing a use state of the concrete spacer according to the first embodiment of the present invention, FIG. 1B is a side view thereof, and FIG. 2 is an iron plate as a component of the concrete spacer. FIGS. 3A and 3B are rear views of the concrete spacers according to the second and third embodiments of the present invention, and FIGS. 4A to 4D are books, respectively. It is a front view, a side view, a plan view, and a perspective view of a concrete spacer according to a fourth embodiment of the invention. FIGS. 5A to 5C are a plan view, a front view, and a side view, respectively, of a concrete spacer according to a fifth embodiment of the present invention.

As shown in FIG. 1, a concrete spacer 10 according to an embodiment of the present invention is made of cement solid (or resin solid), and is disposed between the inside of a mold 11 and a reinforcing bar 12. A main body 13, an iron plate 15 that is an example of a reinforcing bar abutting member that is fixed to the rear portion of the spacer main body 13, protrudes downward and can be bent rearward, and a spacer fixed to the rear portion of the spacer main body 13. It has a string-like binding wire 16 protruding on both sides of the rear part of the main body 13.

The spacer main body 13 has a truncated pyramid shape in which the rear portion (the side in contact with the reinforcing bar 12 via the iron plate 15) has a rectangular shape and the cross-sectional area gradually decreases toward the front side (the side in contact with the mold 11). And is made of cement mortar (an example of cement solids). The length (height h) of the spacer body 13 is usually in the range of 4 to 8 cm, although it varies depending on the standard. The width a of the rear end portion of the spacer body 13 in a rectangular shape is about 1.2 to 3 times the diameter of the reinforcing bar to be attached (for example, 15 to 50 mm), and its height b is (0.3 to 1) It is about a. The distal end portion of the spacer body 13 may be a rectangular flat surface so as to be surely in contact with the mold 11 or may have a circular arc shape in cross section.

The iron plate 15 disposed at the rear portion of the spacer body 13 is formed of a blunt iron plate having a thickness of 0.2 to 0.5 mm, and has a T shape as shown in FIG. It has the rectangular part 17 which contact | abuts, and the bending part 14 connected to the center of the lower part. The width of the rectangular portion 17 is equal to or slightly larger than the width of the rear end portion of the spacer main body 13 so that the peripheral edge protrudes from the rear end portion of the spacer main body 13.
The width c of the lower end of the bent portion 14 is the same as the length obtained by subtracting the width d of the upper end of the bent portion 14 from the width a1 of the rectangular portion 17, so that a large number of iron plates 15 are wasted from one strip 19. You can get a lot of them.

The rectangular portion 17 of each iron plate 15 has a plurality of circular holes 20, and the circular holes 20 are made of a hard synthetic resin (polypropylene, ABS, polyvinyl chloride, nylon, etc.) and have a round screw shape or a headed pin shape. The pin member 21 is fitted and attached, and the tip of the pin member 21 is fitted into the spacer body 13. The pin member 21 and the iron plate 15 are fixed to the spacer main body 13 when the spacer main body 13 is cast in a mold. This pin member may be made of ceramic or mortar.

Two small holes 22 are provided in the central portion of the rectangular portion 17, and the binding wire 16 passes through the small holes 22. Between the two small holes 22, the binding wire 16 is embedded in the spacer body 13. In this embodiment, the binding wire 16 is a dull iron wire having a diameter of, for example, about 0.5 to 1 mm. However, any other wire may be used as long as the concrete spacer 10 can be securely fixed to the reinforcing bar. It may be a material. The binding wire 16 has a total length of about 30 to 80 cm and protrudes about 15 to 40 cm evenly on both sides.

3 (A) and 3 (B) show concrete spacers 24 and 25 according to the second and third embodiments, but the shapes of iron plates 26 and 27 provided on the rear part (back part) of the spacer body 13 are as follows. It differs from the iron plate 15 of the concrete spacer 10 which concerns on 1st Embodiment. In the iron plate 26 of the concrete spacer 24 according to the second embodiment, a round hole 28 is provided at the upper end of the bent portion 14, that is, the connecting portion with the rectangular portion 17, and the bent portion 14 is easily bent at the upper end. ing. The diameter of the round hole 28 is preferably about 1/3 to 2/3 of the width of the upper end of the bent portion 14.

On the other hand, in the iron plate 27 of the concrete spacer 25 according to the third embodiment shown in FIG. 3B, the width of the upper end of the bent portion 30 becomes narrower, the bent portion 30 becomes trapezoidal, and the bent portion 30 is easily bent at its upper end. Note that the width e of the lower end of the bent portion 30 is equal to the length obtained by subtracting the width f of the upper end of the bent portion 30 from the width a1 of the rectangular portion 17, so that a plurality of iron plates 27 can be taken from a single strip with good yield. It is like that.

Subsequently, a concrete spacer 32 according to the fourth embodiment shown in FIGS. 4A to 4D will be described. The rectangular portion 34 of the iron plate 33 is U-shaped by pressing at both sides at the center in the vertical direction. The bent portions 35 and 36 are formed, and a blunt iron wire 37, which is an example of a binding wire, is inserted inside. The front end of the spacer body 38a has a circular arc shape in cross section. In addition, since the other part is the same as the concrete spacer 10 which concerns on 1st Embodiment, the same number is attached | subjected and the detailed description is abbreviate | omitted (in 2nd, 3rd, 5th embodiment) The same).

Subsequently, a concrete spacer 38 according to the fifth embodiment shown in FIGS. 5A to 5C will be described. As shown in the figure, the concrete spacer 38 is made of a hard plastic attached to the rear portion of the spacer main body 13. The plate 39 is provided with bending latching projections 40 and 41, and the folding latching projections 40 and 41 bite into the spacer body 13 to connect the plate 39 and the spacer body 13. The folding latching protrusions 40 and 41 are formed by punching a part of the rectangular portion 42 of the plate 39 and bending it by about 45 to 90 degrees.
The binding wire 43 is disposed on the back side of the plate 39, bent in a V shape at the center, and embedded in the spacer body 13. The bent portion 30 of the plate 39 is the same as the bent portion of the concrete spacer 25 according to the third embodiment.

(A) is a perspective view which shows the use condition of the concrete spacer which concerns on the 1st Embodiment of this invention, (B) is the same side view. It is a top view which shows the processing condition of the iron plate used as the component of the concrete spacer. (A), (B) is a rear view of the concrete spacer which concerns on 2nd, 3rd embodiment of this invention, respectively. (A)-(D) are the front view, side view, top view, and perspective view of the concrete spacer which respectively concerns on 4th Embodiment of this invention. (A)-(C) are the top view, the front view, and the side view of a concrete spacer which concern on the 5th Embodiment of this invention, respectively.

Explanation of symbols

10: Concrete spacer, 11: Formwork, 12: Reinforcing bar, 13: Spacer body, 14: Bending part, 15: Iron plate, 16: Binding wire, 17: Rectangular part, 19: Strip, 20: Circular hole, 21: Pin member, 22: small hole, 24, 25: concrete spacer, 26, 27: iron plate, 28: round hole, 30: bent portion, 32: concrete spacer, 33: iron plate, 34: rectangular portion, 35, 36: U Characteristic bent part, 37: blunt iron wire, 38: concrete spacer, 38a: spacer main body, 39: plate, 40, 41: bent latching protrusion, 42: rectangular part, 43: binding wire

Claims (7)

A concrete spacer for securing a gap between a reinforcing bar arranged in a mold and the mold,
A spacer main body made of cement solid or resin solid, and disposed between the inside of the mold and the reinforcing bar,
A reinforcing bar abutting member fixed to the rear part of the spacer body, having a bent portion that protrudes downward and can be bent backward;
A concrete spacer having a binding wire fixed to a rear portion of the spacer main body and protruding to both sides of the rear portion of the spacer main body. The concrete spacer according to claim 1, wherein the reinforcing bar contact member is made of an iron plate, and the binding wire is made of a metal wire that can be easily bent. 3. The concrete spacer according to claim 2, wherein the binding wire is fixed or held to the iron plate, and the iron plate is fixed to the spacer main body by a plurality of pin members penetrating the iron plate. Spacer. 4. The concrete spacer according to claim 2, wherein the iron plate has a rectangular shape attached to a rear portion of the spacer body and a symmetrical trapezoidal or rectangular shape connected to a central lower portion of the rectangular portion. 5. A concrete spacer having a bent portion, wherein a width of a lower end of the bent portion is equal to a length obtained by subtracting a width of an upper end of the bent portion from a width of the rectangular portion. The concrete spacer according to any one of claims 2 to 4, wherein a round hole is provided at an upper end of the bent portion, and the bent portion is easily bent at the upper end. . The concrete spacer according to any one of claims 2 to 5, wherein the length of the binding wire is in a range of 15 to 40 cm on one side. The concrete spacer according to any one of claims 2 to 6, wherein the binding wire is a blunt iron wire.

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