JPH07286407A - Concrete reinforcing bar - Google Patents

Abstract

PURPOSE:To reduce the number of part items so as to improve productivity and reduce cost by inserting a taper plug into a hole formed at one end part for diameter enlargement, and providing a to embed a reinforcing bar in concrete so that the other end side cannot be pulled out. CONSTITUTION:One end part is provided with a hole 1b formed to insert a taper plug 2, and a slit 1a traversing the hole 1b crosswise so as to enlarge one end part uniformly in the circumferential direction. The peripheral surface is provided with a recessed part 1c so as to prevent the longitudinal movement of a reinforcing bar caused by vibration after embedding the reinforcing bar. The taper plug 2 is provided with a tip with a diameter smaller than the machined bore dimension of the hole 1b smaller in diameter than the reinforcing bar 1, and a large diameter base end. The plug 2 smaller in diameter and lighter in weight than a conventional taper plug used for an anchor body is thus used so as to enable the reduction of material cost, storage cost and transportation cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a concrete reinforcing steel bar suitably used for a joint between an existing reinforced concrete structure and an additional reinforced concrete structure, and particularly, the cost is reduced by reducing the number of parts. At the same time, the present invention relates to a reinforcing bar for concrete, which can reduce the labor and time of installation work.

[0002]

2. Description of the Related Art Generally, concrete is widely used for construction, civil engineering, etc. because it has high compressive strength and high durability and corrosion resistance, but it has the drawback of being weak against pulling, bending and shearing forces. Yes, to make up for this shortcoming,
Reinforcing bars that share tensile, bending and shear forces are driven into the concrete.

This concrete structure reinforced with reinforcing bars is generally called a reinforced concrete structure, and forms a formwork corresponding to the outer shape of the structure. After arranging the reinforcing bars in the formwork, fresh concrete is placed. After solidification, the mold is dismantled and cured to form.
Therefore, there is an advantage that the structure is an integrated structure that does not form a joint which is a weak point of the structure, and the size and shape can be freely selected.

However, in the case of adding concrete or concrete block stacking partitions, fences, etc. to a preformed concrete structure, the concrete or concrete block structure to be added to the existing concrete structure is fixed. For this purpose, a hole is drilled in an existing concrete structure using a concrete drill or the like, and reinforcing steel bars for reinforcing the concrete joint where the anchor and the steel bar are joined are inserted into concrete or a concrete block to be added to the hole.

As a conventional reinforcing bar for a concrete joint, as shown in FIG. 6 or 7, for example, an anchor body 5 and a hole 5d formed at the tip of the anchor body 5 are used.
A taper plug 6 to be inserted into the base member 5 and a reinforcing bar 7 of a predetermined length which is fitted into the base end portion 5b of the anchor body 5 and crimped.

The end of the anchor body 5 has the hole 5d.
Crosswise, for example, a cross-shaped slit 5a is formed, and after the taper plug 6 is lightly inserted into the hole 5d so that it does not slip off, the anchor main body 5 is set deep in the hole drilled in the existing concrete structure. When the reinforcing bar is inserted and then the reinforcing bar is hit with, for example, a hammer to insert the taper plug 6 deeply, the tip of the anchor body 5 expands, and the peripheral surface of the hole drilled in the existing concrete structure. It will bite into the hole and the anchoring effect will make it impossible to remove the reinforcing bar from the hole.

[0007] Reinforcing bars 7 of the reinforcing bars are connected to reinforcing bars buried in an additional concrete structure or concrete block structure by gas pressure bonding, welding, or a sleeve or coupling surrounding the connecting portion. And an adhesive material are used for connection.

As the reinforcing bar 7, a round bar-shaped reinforcing bar may be used, but in order to improve the adhesion with concrete, deformed reinforcing bar having projections such as ribs and nodes formed on the surface is often used. Also, the anchor body 5 is made by cutting a pipe member and sliding it, and as shown in FIG. 6, when the end portion of the reinforcing bar 7 is simply inserted and caulked, and as shown in FIG. In some cases, the female screw 5c may be processed and screwed into the male screw 7a formed at the end of the reinforcing bar 7 and then tightened.

[0009]

However, in the conventional production of reinforcing bars for concrete reinforcement, for example, in the anchor body 5, a pipe-shaped material is processed, a taper plug 6 is inserted, and a cross-shaped sliding to spread in concrete is formed. Splitting 5a is required, and in particular, female threading is required in the example shown in FIG.

Further, in the conventional production of a reinforcing bar for concrete, the anchor body 5, the taper plug 6 and the reinforcing bar 7 are separately formed, and many steps of crimping the anchor body 5 to the reinforcing bar 7 are required. Because
There is a problem that it is not suitable for mass production and is disadvantageous in terms of cost reduction.

Further, when installing the reinforcing bar for concrete, a large-diameter hole into which the anchor body 5 having a diameter larger than that of the reinforcing bar 7 can be inserted is drilled in an existing concrete structure or a reinforced concrete structure with an anchor drill machine. It requires a lot of labor and time for installation work,
There is also a problem that it is disadvantageous in improving workability.

In this case, the drilling work by the anchor drilling machine is a work involving a great deal of vibration, and since the vibration is directly transmitted to the hand, it causes an occupational disease such as white wax disease and meat separation, which adversely affects the worker. There is a risk of exerting it.

The present invention has been completed in view of the above technical problems, has high productivity, and can reduce cost by reducing the number of parts, and can reduce labor and time for installation work. The purpose of the present invention is to provide a reinforcing bar for concrete reinforcement.

[0014]

Means for Solving the Problems A reinforcing bar for reinforcing a concrete joint according to the present invention is a reinforcing bar used for reinforcing concrete in order to achieve the above object,
This reinforcing bar is characterized in that a hole into which a plug is inserted is formed at one end and a slit that crosses the hole is formed.

The rebar of the present invention may be a rebar made by cold rolling, hot rolling, hot drawing or the like, but a bar formed by cold drawing in order to increase the strength of the rebar itself. It is preferable to use a material.

In the present invention, in order to improve the adhesion to concrete, it is preferable that the peripheral surface of the reinforcing bar is formed into an uneven surface, and particularly in the case of the reinforcing bar formed by hot or cold drawing, This uneven surface can be formed by any working method such as cold plastic working such as rolling, hot plastic working, cutting, and grinding, but among these working methods, stress was concentrated. It is recommended to employ cold plastic working, in which the mechanical properties of the concave surface are particularly enhanced by work hardening. Further, when the reinforcing bar is formed by cold rolling or hot rolling, this uneven surface can be formed at the same time when the reinforcing bar is manufactured.

In the present invention, it is advantageous to use the above-mentioned concrete reinforcing bar and a plug inserted into a hole at one end of the reinforcing bar.

In this case, a plug may be inserted into the concrete reinforcing reinforcing bar for distribution, or the concrete reinforcing reinforcing bar and the plug may be separated and distributed as a set.

As the plug, a reinforcing bar is inserted with the plug side in a hole drilled in an existing concrete structure. After that, when the reinforcing bar is hit with, for example, a hammer, the tip portion expands, The structure is not particularly limited as long as it is a structure that bites into the peripheral surface of the hole drilled in the existing concrete structure, and specifically, for example, a taper plug, a bolt-shaped plug or a tack-shaped plug may be mentioned. Of these, a taper plug that spreads evenly and without a gap all around when it is driven is most desirable.

In addition, the shape of the other end is not particularly limited in the concrete reinforcing steel bar of the present invention, but it is simple without using a technique requiring skill such as gas pressure welding, welding, or a special joint such as a sleeve or a coupler. It is desirable that a plug, particularly a taper plug, is connected to the other end of the above-mentioned reinforcing bar so that the replenishment can be performed in the longitudinal direction.

[0021]

In the present invention, since the hole into which the plug is inserted and the slit that crosses this hole are formed at one end,
By inserting a plug into this hole, one end of the reinforcing bar can be expanded in diameter, and the one end of the reinforcing bar can have the function of the anchor body.

Further, when installing the reinforcing bar, it is sufficient to make a hole in the existing concrete structure or the reinforced concrete structure so that one end of the reinforcing bar having a diameter smaller than that of the anchor body can be inserted, so that the labor and time for the installation work can be reduced. can do.

Further, according to the present invention, since the reinforcing bar is provided with the hole into which the plug is inserted at one end and the slit for crossing the hole, the conventional anchor body and the reinforcing bar are integrated to form a component. This has the effect of reducing the score.

[0024]

The concrete reinforcing bar according to the present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto.

As shown in FIGS. 1 to 4, a concrete reinforcing steel bar according to one embodiment of the present invention comprises a reinforcing bar 1 and a plug, in this case, a taper plug 2, and a plug 2 at one end of the reinforcing bar 1. Since the hole 1b into which is inserted is formed, the number of parts is reduced, and the step of cutting the anchor body 3 from the pipe and the step of crimping the anchor body 3 to the reinforcing bar 1 are not required, and the cost is reduced. You can

The reinforcing bar 1 has a taper plug 2 at one end.
It has a hole 1b for inserting a slot and a slit 1a that crosses the hole in a cross shape, and its peripheral surface is formed as an uneven surface having a large number of recesses 1c at appropriate intervals in the longitudinal direction.

The rebar 1 is cold-rolled, hot-rolled,
It is also possible to use a bar material formed by hot drawing or the like, but in this embodiment, in order to increase the strength of one end where the slit 1a and the hole 1b are processed, mechanical processing by surface hardening during processing is performed. A bar formed by cold drawing, which has the most remarkable property improvement, is used.

The cross-sectional shape of the bar is not particularly limited, but in this embodiment, it has a circular cross-section in order to facilitate chucking to the machine tool when machining the slit 1a and the hole 1b. Reinforcing bar 1 is made up of bars. The diameter of the reinforcing bar 1 is the same as the reinforcing bar generally used for concrete reinforcement.

Either of the slide 1a and the hole 1b may be formed first, but in order to prevent one end of the reinforcing bar 1 from being deformed when the hole 1b is formed, after the hole 1b is formed, It is preferable to form the slit 1a.

Further, it is not necessary to form the slit 1a in a cross shape, the end portion of the reinforcing bar 1 is enlarged by inserting the taper plug 2 into the hole 1b, and the reinforcing bar 1 embedded in concrete will be described later. It suffices that the anchor effect can be exerted against the force of pulling out to the other end side. For example, it is formed so as to traverse the hole 1b in a letter shape, or at three positions with a predetermined interval in the circumferential direction. Alternatively, it may be formed so as to traverse the peripheral wall of the hole 1b at a plurality of locations of 5 or more, but in this embodiment, one end of the reinforcing bar 1 is evenly expanded in the circumferential direction, and In consideration of workability, the slit 1a is formed in a cross shape so as to cross the hole 1b.

The concave portion 1c on the peripheral surface can be formed by any working method such as hot plastic working, cutting, and grinding. In this embodiment, however, mechanical properties are improved by surface hardening during working. The recess 1c is formed by the most remarkable cold plastic working, especially by rolling suitable for mass production. The recess 1c may be formed after the formation of the slit 1a, but it is formed before the formation of the slit 1a in order to prevent one end of the reinforcing bar 1 from being deformed.

The recess 1c can be formed in a spiral groove shape, but in this embodiment, it is formed in a peripheral groove shape in order to prevent the recess 1c from moving in the longitudinal direction due to vibration after being embedded. However, even when the concave portion 1c is formed in a spiral groove shape, if the concave portion 1c is formed in the shape of two spiral grooves whose spiral directions are opposite to each other, the rebar 1 is prevented from moving in the longitudinal direction by vibration after being buried. it can.

The taper plug 2 is manufactured in the same manner as the taper plug 6 to be inserted into the conventional anchor body 5, but has a tip having a diameter smaller than that of the hole 1b having a diameter smaller than that of the reinforcing bar 1 and this hole. As long as it has a base end having a diameter larger than the machining diameter dimension of 1b, it has a diameter smaller than the taper plug 6 used in the conventional anchor body 5 which is externally fitted to the reinforcing bar 1 and caulked. Lightweight ones can be used, thus reducing material costs, storage costs and transportation costs.

The taper plug 2 used in the present invention is
The hole 1b is provided with a cylindrical tip portion 2a having substantially the same diameter as the diameter of the hole to be machined, and a tapered taper portion 2b continuous to the base end of the tip portion 2a. It is held so that it does not fall onto the reinforcing bar 1 by being inserted.

As shown in FIG. 3, an existing reinforced concrete structure (or concrete structure) in which this anchor is installed, for example, a concrete soil space 4, is provided with a hole 4a having a diameter slightly larger than that of the reinforcing bar 1 such as a concrete drill. It is perforated using a perforator.

That is, since the hole 4a having a diameter smaller than the hole for inserting the anchor body 3 having a diameter larger than that of the reinforcing bar 1 may be bored, the labor and time required for boring can be significantly reduced, and the construction cost can be reduced. Can be cheap.

In addition, the time required for drilling is shortened, and the force for pressing the punching machine can be weakened when drilling the small-diameter hole 4a as compared with when drilling the large-diameter hole. It is possible to suppress the occurrence or enhancement of occupational diseases such as white wax.

After lightly inserting the taper plug 2 into one end of the above-mentioned reinforcing bar 1 so as not to drop, one end of the reinforcing bar 1 is inserted into the hole 4a formed in the concrete soil 4, and the upper end of the reinforcing bar 1 is hammered, for example. By tapping, the taper plug 2 can be deeply driven into the hole 1b of the reinforcing bar 1, and as shown in FIG. 4, one end of the reinforcing bar 1 can be enlarged to penetrate into the peripheral surface of the hole 4a. As a result, similarly to the conventional anchor body 5, the anchor effect can be exerted against the pulling force of the reinforcing bar 1 to the other end side.

In this way, another reinforcing bar can be added to the upper end of the reinforcing bar 1 installed in the concrete soil 4 by gas pressure bonding or welding, or by using a sleeve, a coupler or the like and an adhesive resin.

In another embodiment of the present invention shown in FIG. 5, in addition to the structure of the above-mentioned one embodiment, at the other end of the reinforcing bar 1,
A plug, in this case, a tapered plug 1d having the same shape and size as the tapered plug 2 is formed.

This taper plug 1d is formed by joining the taper plug 2 formed separately from the reinforcing bar 1 to the other end of the reinforcing bar 1 by welding, pressure welding, forging welding, cutting or the like.
It may be formed by grinding or the like.

In the case of the anchor according to this embodiment, 1
After installing one rebar 1, the rebar 1 can be easily added in the longitudinal direction by inserting it into the hole 1b of another rebar 1 into the taper plug 1d of the existing rebar 1 and hitting the upper end with, for example, a hammer.

Although FIG. 5 shows the case where each rebar 1 is added at a position higher than the surface of the concrete soil 4, the rebar 1 may be added in the hole 4a drilled in the concrete soil 4. In this case, one end portion of each rebar 1 is expanded at a plurality of locations and bites into the peripheral surface of the hole 4a, further enhancing the anchoring effect.

[0044]

As described above, according to the present invention, the conventional anchor body and the reinforcing bar are provided with the reinforcing bar having the hole into which the tapered plug is inserted and the slit that crosses the hole at the one end. And are integrated, and the number of parts is reduced. As a result, the conventional step of cutting the anchor body out of the pipe and the step of crimping the anchor body with the reinforcing bar are not necessary, and a significant cost reduction can be achieved.

Further, since the diameter of the hole to be drilled in the concrete structure to be installed can be made smaller than the case of inserting the conventional anchor main body having a diameter larger than that of the reinforcing bar, the labor and time of the installation work can be shortened, and the installation work It is possible to reduce the construction period and the construction cost.

Furthermore, since the time required for drilling can be shortened and the force for pressing the punching machine that punches a small-diameter hole can be weakened, the occurrence or enhancement of occupational diseases such as white wax disease caused by the vibration of the punching machine can be suppressed. be able to.

In the present invention, particularly when the above-mentioned reinforcing bar is formed by cold drawing, the mechanical properties of the reinforcing bar can be enhanced by surface hardening during cold drawing, and as a result, mechanical properties can be obtained by forming holes. This is advantageous in securing and improving the strength of one end where the strength is reduced.

Further, in the present invention, in particular, when the peripheral surface of the reinforcing bar is formed as an uneven surface, it is advantageous because the adhesion to concrete is enhanced.

In this case, if the uneven surface is formed by cold plastic working, it is advantageous in improving the mechanical properties of the reinforcing bar.

Further, in the present invention, when a taper plug is continuously provided at the other end of the reinforcing bar, a technique requiring skill such as gas pressure welding or welding, or a special joint such as a sleeve or a coupler is not used. For example, it is advantageous that the reinforcing bars can be replenished in the longitudinal direction by a simple work such as hammering the reinforcing bars into the existing reinforcing bars.

In this case, if the reinforcing bars are replenished in the holes drilled in the existing concrete structure, the anchoring effect is exhibited at a plurality of points, and the reinforcing bars are more difficult to be pulled out.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of installation work according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an installed state according to an embodiment of the present invention.

FIG. 5 is a partially cutaway side view of another embodiment of the present invention.

FIG. 6 is a side view in which a part of the conventional example is cut away.

FIG. 7 is a side view in which a part of another conventional example is cut away.

[Explanation of symbols]

 1 Reinforcing bar 1a Sliding 1b Hole 1d Taper plug 2 Taper plug

Claims (7)

[Claims] 1. A reinforcing bar used to reinforce concrete, wherein the reinforcing bar has a hole into which a plug is inserted at one end and a slit that crosses the hole. Reinforcing concrete reinforcement. 2. The reinforcing bar for concrete reinforcement according to claim 1, wherein the reinforcing bar is made of a bar material formed by cold drawing. 3. The reinforcing bar for concrete reinforcement according to claim 1, wherein the peripheral surface of the reinforcing bar is formed into an uneven surface. 4. The uneven surface is cold plastic working, hot plastic working,
The reinforcing steel for concrete reinforcement according to claim 3, which is formed by cutting or grinding. 5. The reinforcing bar for concrete reinforcement according to claim 1, wherein the plug is a taper plug, a bolt-shaped plug or a stud-shaped plug. 6. A concrete reinforcing bar comprising the reinforcing bar for concrete reinforcing according to claim 1 and a plug inserted into a hole at one end of the reinforcing bar. 7. A concrete-reinforcing steel bar, wherein the concrete-reinforcing steel bar according to any one of claims 1 to 5 has a plug continuously connected to the other end thereof.