JP3208428U - Rebar retainer - Google Patents

Abstract

The present invention provides a reinforcing bar holder capable of ensuring stable contact with a curved mold and preventing an increase in physique and increasing an engaging force with a reinforcing bar group. A holder main body 2 has a substantially quadrangular truncated pyramid shape having a trapezoidal shape in the width direction (perpendicular to the reinforcing bar) and an inverted trapezoidal shape in the thickness direction (rebar direction), and a rear end surface 6 is thick. The vertical direction is a rectangular shape, and a plurality of hook fittings 3 are arranged in the thickness direction. The hook fitting 3 is fitted into the reinforcing bar to maintain the engaging force in the reinforcing bar direction. Four edges 51 to 54 project from the leg portion 5 on the distal end surface 4, and the span between the edges 51, 53 in the width direction and the edges 52, 54 is large, and the edges 51, 52 in the thickness direction are large. And the span between the edges 53 and 54 are made small. [Selection] Figure 1

Description

  The present invention relates to a reinforcing bar holder that holds a space between a formwork and a reinforcing bar in placing concrete.

  In general, when a reinforced concrete structure is formed using a mold, first, the reinforcing bars are assembled and arranged in a predetermined shape, and then the mold is framed from four sides. Next, a construction method is adopted in which a reinforcing bar holder is attached everywhere on the inner surface of the formwork and the reinforcing bar group closest to the inner surface of the formwork to appropriately secure the distance between the inner surface of the formwork and the outermost surface of the reinforcing bar group. This is to keep the distance between the inner surface of the formwork and the reinforcing bar group as specified in the concrete placement work. By using this reinforcing bar holder, the cover of the reinforcing bar of the concrete structure is properly formed.

  As described in Utility Model Registration No. 3163336, this reinforcing bar retainer is made of mortar and a truncated pyramid-shaped retainer body, and four edges protruding from each of the four corners of its one end face that abuts the formwork. And the thing of the structure which consists of a hook metal fitting fixed to the other end surface engaged with a reinforcing bar is proposed. The hook fitting has a structure in which fishhook-like pins are arranged opposite to each other to form a pair, and a plurality of pairs are fixed to the other end surface in a row. The reinforcing bar holder is attached to the reinforcing bar so that the reinforcing bar is fitted into the hook metal fitting, and the four edges are set in contact with the inner surface of the mold.

  In the holder body disclosed in Utility Model Registration No. 3163336, the other end face to which the hook fitting is fixed has a quadrangular pyramid shape larger than the one end face protruding from the four edges. That is, since the tip is tapered, the distance between the four edges projecting from the four corners of the one end face is small. This is due to the following request.

A. The volume of the holder body made of mortar or resin, which can be a foreign material, should be as small as possible.
B) If the other end surface is enlarged, a large hook metal fitting can be fixed, and the engagement force with the reinforcing bar can be increased.
C. Make the tip faces of the four edges exposed on the surface of the concrete structure as inconspicuous as possible.

Utility Model Registration No. 3163336

  However, in the conventional configuration, the rectangular area between the four points that can be secured by contacting the four edges with the inner surface of the mold is small, and the stability when contacting the inner surface of the mold is poor. In particular, when the inner surface of the formwork is a convex curved surface, there is a problem that the reinforcing bar holder easily rotates, and normal four-point contact is impaired. If this normal four-point contact is impaired, the holder body is tilted, and the distance between the inner surface of the mold and the reinforcing bar group cannot be maintained accurately.

  Conversely, if the one end face of the truncated pyramid shaped holder body is made larger than the other end face, the size of the holder body becomes large. The holder main body is similar to concrete in material, but the timing of curing is different, and the adverse effect of the reinforcing bar holder as a foreign substance remaining in the concrete is increased.

  The purpose of the present invention is to ensure a stable contact with the curved formwork while preventing an increase in the physique of the holder body, and it is possible to increase the engagement force with the reinforcing bar group by a large hook fitting. It is in providing a reinforcing bar holder.

(About claim 1)
A holder body having a substantially quadrangular pyramid shape, four edges protruding or bulging at each of four corners of the tip surface of the holder body, a tip space formed between the four edges, and a holder A rebar holder made of hook metal fittings fixed to the other end of the main body,
The holder body is formed in a trapezoidal shape in the direction (width direction) orthogonal to the direction in which the hook fitting holds the reinforcing bars (reinforcing bar direction), and the width of the front end surface is set larger than the width of the rear end surface.

Thereby, the span of the direction orthogonal to the reinforcement between the four edges contact | abutted to the inner surface of a formwork can be enlarged. As a result, good contact stability can be reliably obtained even when the inner surface of the mold is curved.
Moreover, compared with the case where the whole holder main body is formed in trapezoid, the increase in a physique can be suppressed.

  Furthermore, since the rear end surface for fixing the hook has a length in the reinforcing bar direction (thickness direction), a large number or large hook fittings can be fixed in the thickness direction of the rear end surface. For this reason, the reinforcing bar retainer can be increased in engagement force by a large number of or large hook fittings and is also stable in the reinforcing bar direction. Thereby, it can prevent that it displaces with respect to the reinforcing steel bar engaged.

(About claim 2)
The holder body is formed in an inverted trapezoidal shape in the thickness direction, and the distance in the reinforcing bar direction (thickness direction) is selectively reduced among the distances (spans) between the four edges.

  Thereby, the physique of a holder main body can be made small, the enlargement of a holder main body can be prevented, and the front-end | tip of the edge which appears on the surface of concrete after shaping | molding can be made not conspicuous.

(Claim 3)
Grooves that are smoothly connected to the tip space formed between the four edges were formed on the side surface (constituting an inverted trapezoid) of the holder main body in the direction orthogonal to the reinforcing bars.

  Through this groove, the slurry can smoothly flow into the tip space when the concrete is placed, and the surface of the concrete structure can be molded cleanly.

It is a perspective view which shows the external appearance of the reinforcing bar holder of this invention (Example 1). The structure of the reinforcing-bar holding tool of this invention is shown, (a) Top view, (b) Front view, (c) Side view, (d) Bottom view. It is the assembly | attachment figure which mounted | worn the reinforcing bar holding tool of this invention between the reinforcing bar and the convex curved formwork, (a) Top view, (b) Front view, (c) Side view.

In order to achieve the above object, the present invention adopts the following configuration.
(1) A holder body in a direction (width direction) orthogonal to the reinforcing bar to which the reinforcing bar holder is attached is trapezoidal.
(2) The holder body in the same direction (thickness direction) as the reinforcing bar to which the reinforcing bar holder is to be attached is formed into an inverted trapezoid.
(3) Grooves that are smoothly connected to the tip space formed between the four edges are formed on the side surface constituting the inverted trapezoid.
Next, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the reinforcing bar holder 1 includes a holder body 2 made of cement mortar and a hook fitting 3 that engages with the reinforcing bar. Four edges 51, 52, 53, 54 protrude from the tip (lower end in the drawing) surface 4 of the holder body 2 at four corners, respectively. The hook metal fitting 3 is fixed to a rear end (upper end in the drawing) surface 6 of the holder body 2 and has a configuration in which four pairs of fishing hook-shaped pins 31 are arranged in an opposing manner in this embodiment.

  The hook metal fitting 3 may have a configuration in which two or three pairs of fishhook-shaped pins 31 are arranged opposite to each other, or may have a configuration in which five or more pairs are arranged. Further, a configuration in which two or more pairs of leaf springs having a cross-section of a fishhook shape are arranged opposite to each other may be employed.

  The holder body 2 has a substantially quadrangular pyramid shape, the rear end surface 6 has a rectangular shape close to a square, and the front end surface 4 has a rectangular rectangular shape. At the center of the rear end face 6, a vertical groove 61 having a shallow arc cross section with which the reinforcing bar contacts is formed between each pair of pins 31, 31 of the hook metal fitting 3. As shown in FIG. 3, a reinforcing bar 8 is fitted between each pair of pins 31, 31 and is fixed between the longitudinal groove 61 and the tips of the pins 31, 31. When the rectangular rear end surface 6 is long in the reinforcing bar direction, the engaging force in the reinforcing bar direction can be increased, and the stability of the reinforcing bar holder 1 is increased.

  The holder body 2 has a trapezoidal shape in the width direction (a direction perpendicular to the reinforcing bars), and the thickness gradually increases from the rear end surface 6 toward the front end surface 4 between the left and right side surfaces 21 and 22. The rear end face 6 has a substantially square shape with a slightly longer thickness direction with a width direction of 35 mm and a thickness direction of 40 mm. The front end surface 4 has a long rectangle in the width direction with a width direction of 50 mm and a thickness direction of 35 mm. The height of the holder body 2 is 55 mm.

  In this embodiment, the front end surface 4 is set to be approximately 42% larger in the width direction than the rear end surface 6, and is 12.5% smaller in the thickness direction. The side surfaces 23 and 24 in the width direction (left and right) of the holder main body 2 are inverted trapezoids, and the distance between the side surfaces 23 and 24 in the thickness direction (front and rear) is from the rear end surface 6 toward the front end surface 4. The thickness gradually decreases. That is, the left and right side surfaces 21 and 22 are trapezoidal surfaces, and the front and rear side surfaces 23 and 24 are inverted trapezoidal surfaces.

  The front end surface 4 is set larger than the rear end surface 6 in the range of 30% or more and 100% or less in the width direction, and small in the range of 10% or more and 30% or less in the thickness direction. It is practical from the viewpoint. The same applies to a large reinforcing bar holder whose holder main body 2 has a height of 70 mm to 80 mm.

  A leg portion 5 having four edges 51 to 54 is formed on the distal end (lower end in the drawing) surface 4 by extending the holder body 2. The leg portion 5 is composed of a base portion 50 extended from the front end surface 4 and four edges 51 to 54 that are smoothly projected at the four corners thereof. Both side surfaces 55 and 56 of the leg portion 5 are extended in an inverted trapezoidal shape from the tip surface 4 of 50 mm × 35 mm, and are inclined surfaces inclined inward.

  The four edges 51 to 54 are formed so as to protrude smoothly from the four corners of the leg portion 50 of the tip (lower end) surface 4 and have a columnar shape or a conical shape with a diameter of the intermediate portion of 10 mm. A space between the four edges 51 to 54 is a tip space 7 into which concrete flows in and is filled. The center of the leg portion 50 is set to a distance of 8 mm from the distal end surface 4. Of the edges 51 to 54, the left and right edges 51 and 53 and the edges 52 and 54 are set to a distance of 35 mm, and the front and rear edges 51 and 52 and the edges 53 and 54 are set to a distance of 20 mm. ing.

  As a result, the front and rear arches 71 and 72 formed between the edges 51 and 53 and the edges 52 and 54 are large, and the left and right arches 73 formed between the edges 51 and 52 and the edges 53 and 54 are large. 74 is smaller.

  Grooves 75 and 76 are formed in the front and rear side surfaces 23 and 24 so as to continue from the center to the arches 71 and 72. The grooves 75 and 76 have an effect of allowing the concrete to smoothly flow into the concrete tip space 7 when placing the concrete.

The holder body 2 is manufactured by filling a mold with cement mortar. In the operation of pulling out the mold, a combination of the above trapezoid and inverted trapezoid is preferable.
The hook metal fitting 3 has a structure in which a pair of pins 31 is formed by bending an iron wire such as a piano wire into a substantially 2 character shape and embedding the lower part in the rear end surface 6 of the mortar holder body 2 before curing.

  Next, the operation | work which mounts said reinforcing bar holder 1 between the reinforcing bar 8 and the formwork 9 is demonstrated. The hook metal fitting 3 is pressed against a predetermined portion of the reinforcing bar 8 located on the outermost side of the reinforcing bar group in parallel, and the reinforcing bar 8 is fitted between the pins 31 and 31. Thereafter, the formwork 9 is assembled from four sides, the reinforcing bar holder 1 is brought into contact with the formwork 9 without tilting, and both the formwork are fastened (fastened) in a state where no gap is generated.

  As shown in FIG. 3B, even when the mold 9 is a convex curved surface, the span between the edges is set large, so that the reinforcing bar holder 1 stably abuts the mold 9. . Even if a slight gap or play exists, the four edges do not rotate over the convex curved surface.

  The reinforcing bar holder of this device is formed in a trapezoidal direction (width direction) perpendicular to the reinforcing bar of the holder main body, and selectively increases the width of the tip surface to increase the contact stability with the mold. Yes. For this reason, it is possible to reliably install the reinforcing bar holder in an unstable place such as a curved surface of the mold.

DESCRIPTION OF SYMBOLS 1 Rebar holder 2 Holder main body 3 Hook metal fitting 4 End surface of holder main body 5 Leg part of holder main body 51-54 Edge 6 Rear end surface of holder main body 7 Tip space 8 Rebar 9 Formwork

Claims (4)

A substantially quadrangular pyramid shaped holder body, four front and rear edges formed projecting from the four corners of the tip surface of the holder body, and a tip space formed between the four edges; A reinforcing bar holder made of a hook metal fitting fixed to the rear end surface of the holder body,
The reinforcing bar holder according to claim 1, wherein the front end surface is set in a trapezoidal shape in which a width direction orthogonal to a reinforcing bar held by the hook metal fitting is larger than a width direction of the rear end surface.   2. The reinforcing bar holder according to claim 1, wherein the front end surface is set to an inverted trapezoid in which a thickness direction in which the hook metal fitting is in a reinforcing bar direction is smaller than a thickness direction of the rear end surface. Reinforcing bar holder.   The reinforcing bar holder according to any one of claims 1 to 3, wherein the front end surface is set to be larger than the rear end surface in a range of 30% or more and 100% or less in the thickness direction, and the width direction. The reinforcing bar holder is characterized by being set to a small size within a range of 10 percent to 30 percent.   The reinforcing bar holder according to any one of claims 1 to 3, wherein a groove connected to a space between the four edges is formed on a side surface of the inverted trapezoid.