JP5961533B2 - Reinforcing bar spacing holder, bar arrangement structure using the same, and method for producing concrete product - Google Patents

Description

  The present invention relates to a reinforcing bar interval holder, a reinforcing bar structure using the same, and a method for manufacturing a concrete product.

The rebar spacing retainer disclosed in Patent Document 1 is formed in a cross shape consisting of arm portions projecting front and rear, left and right, and the front arm portion of the body penetrates vertically and opens one side. The cross-section C-shaped cylindrical reinforcing bar fitting part is provided, and on both the left and right arm parts, a reinforcing bar holding part for holding and holding the horizontal reinforcing bar arranged perpendicular to the vertical reinforcing bar fitted to the reinforcing bar fitting part is provided. .
And while attaching a vertical reinforcing bar to a reinforcing bar insertion part, and holding a horizontal reinforcing bar in a reinforcing bar holding part, a main part is attached to the crossing point of a reinforcing bar, and a space with a formwork is formed in each arm part. Hold and get accurate cover thickness.

Japanese Patent No. 2852500

However, in the reinforcing bar interval holder having the above-described configuration, for example, the reinforcing bars are located only at a position that is considerably higher than the arm length from the bottom of the formwork, in other words, only in the upper part of the formwork near the upper opening where concrete is placed in the formwork. In the production of concrete products that are arranged, there is a problem that the reinforcing bars cannot be held at such positions.
Accordingly, an object of the present invention is to provide a reinforcing bar interval holder that can reinforce reinforcing bars in the upper part of a mold, a reinforcing bar structure using the reinforcing bar spacing holder, and a method for manufacturing a concrete product.

In view of the above problems, the reinforcing bar spacing holder of the present invention is made of a synthetic resin in which the main body is mounted at the intersection of the grid-like reinforcing bars in plan view and is opposed to the upper end portion through the upper opening of the mold A main body is suspended in a mold from a support rod that is detachably mounted in the middle, and a suspension part that can be cut at the time of demolding is extended from the main body , and the suspension part is attached to the support collar at the upper end. A mold or an O-shaped ring-shaped fitting portion is provided .
In the bar arrangement structure according to the present invention, the reinforcing bar interval holder main body made of synthetic resin is mounted at the intersection of the planar lattice reinforcing bars arranged in the mold, and the suspension part extends upward from the main body. A support rod that is formed so as to be detachably mounted between the upper end portions facing each other through the upper opening portion of the mold frame, and a C-shaped or O-shaped ring-shaped fitting portion provided at the upper end of the suspension portion. It is characterized by being attached to.
Further, in the method for producing a concrete product according to the present invention, with the above bar arrangement structure, after arranging the lattice reinforcing bars in plan view horizontally in the mold, the concrete is placed in the mold, and the concrete is cured. After solidification, the suspension part protruding from the concrete product is cut to remove the support rod from the formwork and to remove the mold.

In short, since the present invention has the above-described configuration, the main body is mounted at the intersection of the plan view grid reinforcing bars arranged in the mold, and the suspension part extends upward from the main body. By attaching the C-shaped or O-shaped ring-shaped fitting part provided at the upper end of the part to a support rod that is detachably mounted between the opposing upper end parts of the mold, In addition, the grid-like reinforcing bars in a plan view can be placed horizontally and stably held.
And, after placing the bars, placing concrete in the formwork, curing and solidifying the concrete, cutting the suspension part protruding from the concrete product to remove the support rod from the formwork and demolding Thus, the grid-like reinforcing bars can be embedded horizontally with a predetermined cover thickness from the upper surface of the concrete product corresponding to the upper surface in the mold.
Therefore, according to the present invention, a concrete product in which a reinforcing bar is arranged only in the upper part of the mold, which is located at a considerably high position from the inner bottom of the mold, can be easily manufactured.

It is a front view of a reinforcing bar interval holder. It is a right view of FIG. It is a left view of FIG. It is a simplified sectional view showing a bar arrangement state. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. It is a front view which shows the other example of a reinforcement space | interval holder.

An embodiment of the present invention will be described below with reference to the drawings.
The reinforcing bar spacing holder according to the present invention is a grid-like reinforcing bar G (hereinafter referred to as a grid-like reinforcing bar) in a plan view only above the inside of the mold W which is located at a considerably higher position from the inner bottom W2 of the mold W of the concrete product (not shown). The main body 1 of the reinforcing bar spacing holder is integrally formed of a synthetic resin in a cross shape having arm portions 2 to 4 on the upper, lower, left and right sides.

  The lower arm portion 2 is provided with a rebar fitting portion 5 having a C-shaped cylindrical cross section that penetrates the base portion in the front-rear direction and opens one side (right side in FIG. 1), and the front end surface of the rebar fitting portion 5. A lower arm portion 2 that continues downward is formed in a substantially pentagonal plate shape that is symmetrical to the left and right, and a plate-like rib 6 having a predetermined shape protrudes along the axis of the rear surface of the lower end.

  The side opening 5a of the reinforcing bar fitting part 5 is formed so as to gradually narrow toward the center of the reinforcing bar fitting part 5, and the vertical bar G1 (lattice shape) is formed from the side opening part 5a into the reinforcing bar fitting part 5. The side opening 5a is elastically expanded due to its material characteristics when the reinforcing bar G is inserted.

  The left and right arms 3 are formed in the same band plate shape with a tapered tip, and a transverse bar G2 welded orthogonally to the vertical bar G1 (the other bar where the lattice bar G intersects) A pair of left and right rebar sandwiching portions 7 are provided to project forward, and plate-shaped ribs 8 having a predetermined shape project from the rear surface along the axis.

The rebar sandwiching portion 7 has a pair of support pieces 7a projecting on the front surface of the arm portion 3 with a space equal to the diameter of the horizontal rebar G2 up and down, and the front of the support piece 7a forms a rebar insertion port 7b. The reinforcing bar insertion claw piece 7c, which is formed in a substantially triangular shape so as to narrow the reinforcing bar insertion port 7b toward the back (rear), protrudes from the upper and lower staggered positions in front of the supporting piece 7a.
A depth (rear) space between the support pieces 7a continuous to the rear of the transverse muscle insertion opening 7b is formed as a transverse muscle clamping hole 7d for receiving the transverse muscle G2.

The upper arm portion 4 is formed in a short rectangular plate shape whose base portion 4a extends upward from the intersection with the left and right arm portions 3. The upper arm portion 4 is moved forward from the base portion 4a with a step of the same thickness. A strip-shaped extension 4b having a width is continuously formed.
The upper arm portion 4 has plate-shaped ribs 9 and 9a having a predetermined shape protruding on the front and rear axis lines, and a plurality of left and right sides of the extension portion 4b via the ribs 9 and 9a are provided on the left and right sides. The through holes 10 having a predetermined shape are arranged in the vertical direction.

On the upper end of the upper arm portion 4 (extension portion 4b), a suspension portion 11 having the same thickness as this and a predetermined length is formed to extend upward.
As will be described later, the suspension part 11 is attached to a support rod X that is horizontally mounted between the upper ends Wa and Wb of the mold W so that the main body 1 is suspended in the mold W, and can be cut when removed. In addition, a C-shaped ring-shaped fitting portion 12 penetrating forward and backward is provided at the upper end of the suspension portion 11 so as to be attached to the support rod X.

The support rods X are rebars that are detachably mounted in parallel between the upper ends Wa and Wb facing each other through the upper opening W1 in the mold W (only one of them is shown in the illustrated example). The support rod X is set to be parallel to the vertical stripe G1.
At appropriate positions of the upper end portions Wa and Wb, a column 13 having a semi-arc-shaped rod receiver 13a having a bifurcated tip on the right and left is provided at the upper end, and the end portion of the support rod X on the rod receiver 13a of the column 13 Is placed between the upper end portions Wa and Wb in a detachable manner.
In addition, the height of the support | pillar 13 is not limited to the example of illustration, The thing of height is selected and employ | adopted suitably.

Then, the reinforcing bar spacing holder main body 1 is attached to each of the intersecting portions of the grid-like reinforcing bars G arranged in the upper part in the mold W having the above-described configuration.
This attachment is performed by inserting the longitudinal bar G1 from the side opening 5a of the reinforcing bar fitting part 5 and inserting the horizontal bar G2 from the reinforcing bar insertion part 7b of the reinforcing bar holding part 7 to insert the side opening 5a and the reinforcing bar. The opening 7b is elastically expanded depending on the material properties, and guides the reinforcing bars G1 and G2 to the inside of the reinforcing bar fitting portion 5 and the horizontal bar holding hole 7d, and returns elastically after passing through the reinforcing bars G1 and G2. This can be achieved by securing the reinforcing bars G1 and G2.

In this way, a support is provided in which the fitting portion 12 of the suspension portion 11 extending upward from the main body 1 mounted at each crossing portion of the grid-like reinforcing bar G is horizontally placed between the opposed upper end portions Wa and Wb of the formwork W. Attach to 竿 X.
Even when the fitting portion 12 is attached to the support rod X, the support rod X is inserted through the gap between the both end portions 12a of the fitting portion 12 so as to be elastically expanded between the both end portions 12a according to the material characteristics. This can be achieved by guiding the heel X inward and returning elastically after passing through the support ridge X to prevent the support ridge X from being removed.
Thereby, the grid-like reinforcing bar G can be placed horizontally above the mold W and stably held.

  In the formwork W shown in FIG. 4, a step W3 formed above the inner bottom W2 is fitted with a reinforcing bar spacing holder M in front of the intersection of the latticed reinforcing bars G, and the step W3 and the mold. The distance from the frame side wall W4 is maintained.

Next, concrete (not shown) is placed in the mold W from the upper opening W1, and after curing and hardening of the concrete, the suspension part 11 protruding from the concrete product (upper opening W1) is cut. The support rod X is detached from the formwork W and removed.
Thereby, the grid | lattice-like reinforcing bar G is embed | buried horizontally with the predetermined cover thickness from the concrete product upper surface corresponding to the upper surface in the formwork W. FIG.

In addition, the form of the reinforcing bar interval holder main body 1 is not limited at all as long as the intersection of the lattice reinforcing bars G can be mounted.
Further, in the present embodiment, the case in which the main body 1 is attached to the lattice reinforcing bar G and the suspension part 11 is attached to the support rod X is shown, but the suspension part 11 is attached to the support rod X. After that, the main body 1 may be attached to the lattice rebar G.
In this case, the main body 1 suspended from the support rod X is slid along the support rod X to adjust the suspension position of the main body 1 with respect to the support rod X, and the main body 1 can be attached to the intersection of the lattice rebars G.

Therefore, as in the other example shown in FIG. 6, the fitting portion 12 is formed as an O-shaped ring, and is laid out in advance in the mold W as described above so as to be slidably fitted onto the support rod X in advance. You may make it like manufacturing a product.
6 is basically the same as the above except that the suspension part 11 is formed in an elongated shape and the fitting part 12 is an O-shaped ring. Corresponding portions are denoted by the same reference numerals in FIG.

1 (Rebar spacing holder) body
11 Suspension part G Planar lattice rebar W Formwork
W1 Upper opening
Wa top edge
Wb Upper end X Support rod

Claims (3)

In the plan view grid pattern rebar intersections in the body reinforcing bar spacing retainer made of synthetic resin to be attached, the body than the support rod which rotatably and laterally placed detachably between the upper end portions opposing each other via the upper opening of the mold A suspension part that can be suspended in the mold and cut off at the time of demolding extends from the main body , and the suspension part is provided with a C-shaped or O-shaped ring-shaped fitting part that is attached to a support rod at the upper end . A rebar spacing retainer characterized by the above. Attach the reinforcing bar interval holder main body made of synthetic resin to the intersection of the grid-like reinforcing bars arranged in a plan view, and extend the suspension part upward from the main body, and the upper end of the suspension part A bar arrangement structure in which a C-shaped or O-shaped ring-shaped fitting portion provided on the frame is mounted on a support rod that is detachably mounted between upper end portions facing each other through an upper opening of the mold . Attach the reinforcing bar interval holder main body made of synthetic resin to the intersection of the grid-like reinforcing bars arranged in a plan view, and extend the suspension part upward from the main body, and the upper end of the suspension part The C-shaped or O-shaped ring-shaped fitting portion provided on the top of the mold is mounted on a support rod that is detachably mounted between the upper ends facing each other via the upper opening of the mold, and the plan view lattice in the mold After placing the reinforcing bars horizontally, the concrete is placed in the mold, and after curing and curing the concrete, the suspension part protruding from the concrete product is cut to remove the support rod from the mold and remove it. A method for producing a concrete product characterized by being molded.

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