JP5542590B2 - Rebar retainer - Google Patents

Description

  The present invention relates to a reinforcing bar holder used for reinforcing bar construction.

  When a concrete structure is molded in a mold, the distance between the reinforcing bar and the mold is usually secured by a reinforcing bar holder in order to secure a cover (concrete thickness up to the surface of the concrete structure).

  Patent Document 1 describes a semi-disc shaped mortar reinforcing bar spacer to which a reinforcing bar holding tool is attached.

Utility Model Registration No. 3109944

The said patent document 1 has the following subject.
Depending on the orientation of the rebar spacer, the rebar will fall off the rebar holding device.
There is a risk of corrosion of the reinforcing bar holder.
Since the reinforcing bar spacer has a semicircular shape, the reinforcing bar spacer cannot stably come into contact with the inner surface of the mold.

  An object of the present invention is to provide a reinforcing bar holder that can firmly hold a reinforcing bar and can freely set the direction of holding the reinforcing bar.

(About claim 1)
The reinforcing bar holder includes a disc-shaped holding body having an inclined shaft hole whose hole width gradually decreases from one side to the other side, and a columnar wedge for fixing the reinforcing bar to the holding body.
The inclined shaft hole includes an inclined groove having an arc cross section into which the wedge is pushed, a semicircular groove formed at the back of the inclined groove for positioning the reinforcing bar, and a passage for inserting the reinforcing bar into the inclined groove.
The wedge has an inclination with an inclination angle corresponding to the inclination of the inclined groove, a side surface in which the width gradually decreases from the proximal end to the distal end, and a grooved surface in which a groove for pressing the reinforcing bar is provided in the longitudinal direction And have.

Reinforcement work using rebar holders (plural) is performed according to the following procedure.
The rebar is inserted into the inclined groove from the passage of the holder main body and inserted into the semicircular groove, and the outer peripheral surface of the holder main body is brought into contact with the inner surface of the mold.
Next, the wedge is pushed in from the one side of the inclined groove toward the other side.
When the wedge is pushed into the inclined groove, the gap between the side surface of the wedge and the inclined groove becomes narrower, and the gap between the grooved groove and the semicircular groove becomes smaller. The sandwiched reinforcing bars are firmly fixed to the holder body.
Pour concrete into the formwork, solidify, and remove the formwork.

The reinforcing bar holder has the following advantages.
When the wedge is pushed into the inclined groove, the wedge and the reinforcing bar are firmly fixed to the holder body. In addition, since the holder main body has a disk shape, the outer peripheral surface of the holder main body can be brought into contact with the inner surface of the mold frame at any angle, and the rebar does not come off.
For this reason, the direction which hold | maintains a reinforcing bar with a holder main body can be set freely.
Since a wedge is used to fix the reinforcing bar to the holder body and no metal object such as a spring is used, corrosion caused by the metal object does not occur.

(About claim 2)
Since the flat surface and the U-shaped groove are alternately provided on the outer periphery of the holder body, the flat surface comes into contact with the inner surface of the mold. For this reason, the reinforcing bar holder can be stably brought into contact with the inner surface of the mold.

(Claim 3)
The holder main body is mortar or concrete, and the wedge is a curable putty mainly composed of mortar, concrete, or inorganic material. Therefore, the holder main body is well adapted to the concrete poured into the mold and has excellent embeddability.

(About claim 4)
If a strong vibration or impact is applied after the wedge is pushed in, the wedge may rarely loosen.
As a countermeasure, by applying a water-soluble inorganic adhesive (mainly silicate) to the outer periphery of the wedge that is pushed into the inclined groove, the wedge is more firmly fixed to the holder body. Looseness can be prevented.

It is explanatory drawing of the reinforcing bar holder which concerns on Example 1 of this invention. It is explanatory drawing of the wedge of the reinforcing bar holder. In (a) to (c), the left diagram is a process diagram of the reinforcing bar work for fixing the reinforcing bar to the holder body from one side direction, and the right diagram column is the reinforcing bar work for fixing the reinforcing bar to the holder body. It is process drawing seen from the reinforcing bar longitudinal direction.

A reinforcing bar holder A according to Embodiment 1 (corresponding to claims 1, 2, and 3) of the present invention will be described with reference to FIGS.
The reinforcing bar holder A fixes the disc-like holding body 2 (made of mortar) having the inclined shaft hole 1 whose hole width gradually decreases from one side to the other side, and the reinforcing bar 3 to the holding body 2. Columnar wedge 4 (made of mortar).

The inclined shaft hole 1 of the holder body 2 includes an inclined groove 11 having a substantially arc-shaped cross section into which the wedge 4 is pushed, a semicircular groove 12 formed at the back of the inclined groove 11 for positioning the reinforcing bar 3, and the reinforcing bar 3. It comprises a passage 13 for entering the inclined groove 11.
The holder body 2 is provided with flat surfaces 14 and U-shaped grooves 15 alternately on the outer periphery.

  The wedge 4 has an inclination corresponding to the inclination of the inclined groove 11, and is provided with side surfaces 41 and 42 whose width gradually decreases from the proximal end toward the distal end, and a groove 43 for pressing the reinforcing bar 3 in the longitudinal direction. A grooved surface 44, an end surface 45 that closes the boundary between the passage 13 and the inclined groove 11, a trapezoidal tip surface 46, and a trapezoidal base end surface 47 that is larger than the tip surface 46.

Reinforcing bar construction using the reinforcing bar holder A is performed as follows.
The rebar 3 is inserted into the inclined groove 11 from the passage 13 of the holder body 2 and is inserted into the semicircular groove 12, and any flat surface 14 of the holder body 2 is brought into contact with the inner surface of the mold (not shown). {See (a) of FIG. 3}.

Next, the wedge 4 is struck and pushed in with a mallet or the like from one side (right side in the figure) to the other side (left side in the figure) of the inclined groove 11 (see FIG. 3B).
When the wedge 4 is pushed into the inclined groove 11, the gap between the side surfaces 41, 42 of the wedge 4 and the inclined groove 11 becomes narrow, so that the wedge 4 is firmly fixed to the holder body 2, and the grooved surface 44. Since the gap between the groove 43 and the semicircular groove 12 is also narrowed, the reinforcing bar 3 sandwiched between the grooves is firmly fixed to the holder body 2 (see FIG. 3C).
Pour concrete into the formwork, solidify, and remove the formwork.

The reinforcing bar holder A has the following advantages.
When the wedge 4 is pushed into the inclined groove 11, the wedge 4 and the reinforcing bar 3 are firmly fixed to the holder body 2. In addition, since the holder main body 2 has a disk shape, the flat surface 14 of the holder main body 2 can be brought into contact with the inner surface of the mold frame at any angle, and the rebar 3 does not come off. .

For this reason, the direction which hold | maintains the reinforcing bar 3 with the holder main body 2 can be set freely.
Since the wedge 4 is used to fix the reinforcing bar 3 to the holder body 2 and no metal object such as a spring is used, corrosion caused by the metal object does not occur.

  Since the flat surface 14 and the U-shaped groove 15 are alternately provided on the outer periphery of the holder main body 2, the flat surface 14 comes into contact with the inner surface of the mold. For this reason, the reinforcing bar holder A can be stably brought into contact with the inner surface of the mold.

  Since the holder main body 2 and the wedge 4 are mortars, they are well adapted to the concrete poured into the mold and have excellent embeddability.

(Modification)
a. The wedge may be a curable putty mainly composed of an inorganic substance other than mortar and concrete (corresponding to claim 3).
b. A water-soluble inorganic adhesive (mainly silicate) may be applied to the outer periphery of the wedge pushed into the inclined groove. By doing so, the wedge is more firmly fixed to the holder body, and the wedge can be prevented from loosening (corresponding to claim 4).

  If the reinforcing bar holder of the present invention is used, the reinforcing bar can be firmly held and the direction of holding the reinforcing bar can be freely set.

A Reinforcing bar holder 1 Inclined shaft hole 2 Holder body 4 Wedge 11 Inclined groove 12 Semicircular groove 13 Passage 14 Flat surface 15 U-shaped groove

Claims (4)

A disc-shaped holder body having an inclined shaft hole in which the hole width gradually decreases from one side to the other side;
A reinforcing bar holder made of columnar wedges for fixing the reinforcing bar to the holder body,
The inclined shaft hole of the holder body includes an inclined groove having a substantially arc-shaped cross-section into which wedges are pushed, a semicircular groove formed at the back of the inclined groove for positioning the reinforcing bar, and the reinforcing bar in the inclined groove. With a passage to enter,
The wedge has an inclination corresponding to the inclination of the inclined groove, a side surface in which the width gradually decreases from the proximal end to the distal end, and a grooved surface in which a groove for pressing the reinforcing bar is provided in the longitudinal direction Reinforcing bar holder characterized by having.   The reinforcing bar holder according to claim 1, wherein flat surfaces and U-shaped grooves are alternately provided on an outer periphery of the holder body. The holder body is mortar or concrete,
The reinforcing rod holder according to claim 1 or 2, wherein the wedge is a curable putty mainly composed of mortar, concrete, or an inorganic substance.   The reinforcing bar holder according to claim 3, wherein a water-soluble inorganic adhesive is applied to an outer periphery of the wedge pushed into the inclined groove.

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