JP2001173159A - Spacer for reinforced concrete execution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced concrete execution spacer capable of coping with the various outside diameters of reinforcing bars, coping with vibration at an execution site without carelessly sliding and rotating the reinforcing bars and without producing rust and hardly producing looseness. SOLUTION: A stop and bundling string 2 is fixed on the spacer body 1 in a state that it is inserted, made of a material having flexibility capable of curvature in the longitudinal direction and rust resistance, has a number of slip stop small irregular parts 3, a slip stop hooking part 4 hooked in the state that the part 3 is inserted is possessed on one side end, a tapered part 6 for insertion into the hole part 5 of the hooking part 4 is possessed on the other side end, and a part near the hooking part 4 of the string 2 is inserted in a form to be molded and fixed during molding of the spacer body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete construction spacer, which is interposed between a reinforcing bar and a structure or a formwork between a reinforcing bar and a structure or a formwork when the reinforced concrete structure is constructed. In this state, the reinforcing bar is fixed.

[0002]

2. Description of the Related Art There have been several types of reinforced concrete construction spacers. That is, 1) a single body of the spacer body alone, with one side abutting on a concrete structure, a formwork or the like, and a reinforcing bar placed or engaged on the other side (for example, Design Registration No. 997240). Reference).

[0003] 2) Wires are passed through through holes formed in the spacer main body. One side of the main body is in contact with a concrete structure or a formwork, and a reinforcing bar is placed or engaged on the other side. Then, a metal wire is turned around a rebar and fastened (see, for example, Japanese Patent No. 735567). There are two types, one in which a metal wire is inserted in the spacer body in advance, and the other in which a metal wire is inserted in a construction site only by having a through hole in the spacer body.

[0004] 3) A metal wire having a spring property is inserted into a through hole formed in the spacer body and twisted.
In a state in which one side of the main body is in contact with a concrete structure, a formwork, or the like, a metal wire having a spring property is hooked on a reinforcing steel bar (for example, Japanese Utility Model Application Laid-Open No. 60-57619).
JP, JP-A-63-192518, JP-A-63-192518
No. 11756).

[0005] 4) Although the spacer body is a single body, the shape of the spacer body itself is a special shape having a groove which can be engaged with a reinforcing bar which is orthogonal (for example, JP-A-1-239248, JP-A-3-33373). Gazette, Jpn.
No. 0).

[0006] 5) A spring-like metal plate having a groove corresponding to the outer diameter of a reinforcing bar is hung on one side surface of the spacer body, and the other side surface of the main body is applied to a concrete structure or a formwork. In a state in which the reinforcing bars are in contact with each other, a reinforcing bar is engaged with and hooked into the concave groove (for example, Japanese Utility Model Laid-Open No. 6-16556, Japanese Utility Model Laid-Open No.
No. 1186, Design Registration No. 1032643).

[0007]

However, the above-mentioned conventional reinforced concrete construction spacer has the following disadvantages and problems. First, in the above 1), since the reinforcing bar is simply placed or engaged with the spacer body as a single unit, concrete is poured at the time of construction,
The pressure caused the reinforcing bars and spacers to come off or to be displaced. This will have a negative effect on the strength of the resulting construction.

In the case of the above 2), the wire inserted in advance into the spacer body at the site or at the site is turned around the rebar and tightened.
Tightening is troublesome and workability is poor, and the wire rusts, causing a problem in strength.

In the case of the above 3), since the reinforcing bar is hung by a spring-like metal wire inserted through the spacer body, it is necessary to prepare various types according to the outer diameter of the reinforcing bar. However, depending on the shape of the metal wire having the spring property, the reinforcing bar slips in the axial direction or the circumferential direction, resulting in an unstable state, and there is also a problem of rust as in the above 2).

[0010] In the above item 4), since the spacer body itself has a special shape having a groove which can be engaged with the reinforcing bar which is orthogonal to the reinforcing bar, the size and shape of the groove are various depending on the outer diameter of the reinforcing bar. Need to be prepared, which increases the cost.

In the above 5), a reinforcing bar is engaged and held in a concave groove of a resilient metal plate provided on one side surface of the spacer main body. It is necessary to prepare it, the reinforcing bar slips in the axial direction and the circumferential direction, causing an unstable situation, and concrete injection leakage occurs in the shadowed part of the metal plate, which is a negative factor in strength. It has become.

An object of the present invention is to eliminate the disadvantages and problems of the conventional reinforced concrete construction spacer. That is, the object of the present invention is to be able to cope with various outer diameters of the rebar, the rebar does not inadvertently slip or rotate, does not generate rust, and can cope with vibrations at the construction site, and is less likely to loosen An object of the present invention is to provide a reinforced concrete construction spacer.

[0013]

A spacer for reinforced concrete construction according to the present invention comprises a spacer body 1 and a tying string 2
The fastening string 2 is made of a material having flexibility and rust resistance that can be bent in the longitudinal direction,
A plurality of small retaining portions 3 for retaining over substantially the entire length, and a retaining portion 4 for retaining that can be retained in a state where the small concave / convex portions 3 are inserted into one side end, At the side end, a tapered portion 6 for insertion into the hole 5 of the hooking portion 4 is provided,
The portion of the tying cord 2 near the hooking portion 4 is molded and fixed by inserting it into a mold at the time of molding the spacer body 1.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above construction, the spacer body 1 is generally made of mortar or concrete, and preferably made of mortar mixed with glass fibers. There are various types of outer shapes and dimensions of the spacer body 1 as apparent from the figures of the above-mentioned prior art examples (see also FIGS. 1 and 5).

The tying cord 2 is formed of a material having flexibility and rust resistance which can bend in the longitudinal direction as described above, and is made of a semi-rigid material such as nylon 6.6 (66 nylon). It is preferable to use a soft synthetic resin close to that, or a metal such as stainless steel or brass. The tying cord 2 may be a flat band shape (for example, FIG.
2, 3, and 4), the shape is not limited to this, and a cross-sectional shape may be used (for example, see FIG. 6).

The length of the tying cord 2 is slightly different depending on the outer diameter of the reinforcing bar and the size of the spacer body 1, but usually it is 15 mm.
If the length is about 20 cm to 20 cm, it can be used in most cases. In addition, a plurality of small uneven portions 3 for retaining are formed over substantially the entire length. The small uneven portion 3 is repeatedly formed in a wavy shape if the cross-sectional shape of the tying cord 2 is a flat band shape (for example, see FIGS. 1 to 5). If it is a round string, it is formed in a rosary (for example, see FIG. 6).

The cross-sectional shape of each of the small concave and convex portions 3 is not symmetrical in the longitudinal direction, but is easy to insert into the hole 5 of the hooking portion 4 from the tapered portion 6 side, and once inserted, comes back to the original position. Like not
If the tying cord 2 is band-shaped, it is shaped like a low right triangle or sawtooth on the tapered portion 6 side, and if it is round cord-shaped, it is shaped like a cone near a cone.

It is advantageous to form all of the small uneven portions 3 in the same shape from the viewpoint of manufacturing cost.
However, the present invention is not limited to this. For example, a portion that enters the spacer body 1 may be formed in a large uneven portion.

A hook 4 formed at one end of the tying cord 2
The hole 5 into which the tapered portion 6 at the other end can be inserted, and the small uneven portion 3 can be checked against the shape of the small uneven portion 3 so that the hole 5 does not come out after insertion. A latching piece 7 is formed (see, for example, FIGS. 2 and 6 described above).

The tying cord 2 is inserted into and fixed to the spacer body 2. The portion of the tying string 2 near the hooking portion 4 is attached to the inside of the mold when the spacer body 1 is formed. The mortar or concrete material is injected and molded integrally and fixed. At this time, it is desirable that the small uneven portion 3 of the tying cord 2 be inserted and fixed so as to come to the inner peripheral surface when the reinforcing bar 8 is tightened later.

The position where the tying cord 2 is inserted into and fixed to the spacer body 1 may be near one side of the spacer body 1 (for example, see FIGS. 1 to 4) or may be at the center (for example, FIG. 1 to FIG. 4). (See FIG. 5). As a result, the locking portion 4 side and the tapered portion 6 side of the tying cord 2 are in a state of protruding above the spacer body 1 or both sides.

The use state of the spacer for concrete construction according to the present invention is as follows. At the concrete construction site, one side of the spacer body 1 is
In the state where the reinforcing bar 8 is placed or abutted on the other side surface, and the tapered portion 6 side of the tying cord 2 protruding upward or to the side of the spacer body 1. Then, on the side of the hook 4, the tapered portion 6 is inserted into the hole 5 of the hook 4 while being surrounded from both sides of the reinforcing bar 8. Then, the tapered portion 6 may be sufficiently pulled, and the reinforcing bar 8 may be fastened with the tying cord 2.

As a result, the small uneven portion 3 of the tying cord 2 is hooked by the hooking portion 4 of the spacer, so that the spacer is not pulled out. Therefore, even when an external force is applied, the tying strap 2 does not loosen or slip out of the hooked state, and the reinforcing bar 8 is firmly held and fixed. After that, the tapered portion 2 side of the tying cord 2 which is left over from the hanging portion 4 may be cut with a cutter or a special tool.

At the concrete construction site, various types of reinforcing bars 8 having different outer diameters are used. In this spacer, while the reinforcing bars 8 are held and fastened by the tying straps 2 as described above, almost the entire length in the length direction is obtained. The hooking portion 4 hooks at any position of the small uneven portion 3 extending over. Therefore, the length of the tying strap 2
If the length is set to correspond to the maximum diameter of the reinforcing bar 8 to be used, all the reinforcing bars 8 having a smaller diameter can be used, and it is not necessary to prepare various types of spacers as in the related art.

In use, the tying cord 2 is strongly pulled to tighten the reinforcing bar 8, but a large number of small uneven portions 3 formed over almost the entire length of the tying cord 2 form the mortar or mortar when the spacer body 1 is formed. Since it is firmly penetrated into concrete and fixed (for example, see FIG. 2 described above), even if the tying strap 2 is pulled, it does not come off from the spacer body 1. For this reason, in the present spacer, the reinforcing bar 8 can be firmly fastened to the spacer body 1 to be integrated, and no sliding in the axial direction or rotation in the circumferential direction occurs.

Further, when the above-mentioned reinforcing bar 8 is tightened and fixed, if the small uneven portion 3 of the tying cord 2 comes to the inner peripheral surface, if it is used, if it is enlarged, the fine uneven portion is formed on the outer peripheral surface. Since each small uneven portion 3 comes into contact with a certain reinforcing bar 8 (see, for example, FIG. 2 above), the friction at the contact surface is increased, and from this point, the reinforcing bar 8 can slide in the axial direction or Rotation in the direction is prevented.

If the material of the tying cord 2 of the spacer is made of a semi-rigid or soft synthetic resin close to this, or a metal such as stainless steel or brass, the rust will not be lost even after many days have passed after use. Since no cracking occurs, the strength of the concrete component is not affected.

Further, the tying cord 2 is made of, for example, nylon 6.6.
When it is made of a semi-rigid or other soft synthetic resin close to it, it itself has some elasticity. Therefore, after the reinforcing bar 8 is tightened and fixed with the tying strap 2 using this spacer, even if vibration occurs due to concrete injection or the like, the tying strap 2 absorbs the vibration. There is no problem in fixing and holding the reinforcing bar 8.

[0029]

1 to 6 show an embodiment of a spacer for concrete work according to the present invention. Reference numeral 1 denotes a spacer body, which is made of mortar and mixed with glass fibers. There are various shapes of the spacer main body 1. Here, a shape having an inverted triangular shape and a lower portion having a forked shape is used. However, the present invention is not limited to this. For example, a rectangular shape as shown in FIG.
Other various shapes may be used.

Reference numeral 2 denotes a fastening string, which is inserted and fixed to the spacer body 1. The tying cord 2 is made of a material having flexibility and rust resistance that can be bent, and here is made of semi-hard nylon 6.6 (66 nylon), and has a flat band shape in cross section. . However, the present invention is not limited to this, and a round cord having a circular cross section as shown in FIG. 6 may be used.

The tying cord 2 is 15 cm in length, 4.4 mm in width and 1.2 mm in thickness. Formed continuously. Each small uneven portion 2 is not symmetrical in the longitudinal direction, but is easily inserted into the hole 5 of the hooking portion 4 from the tapered portion 6 and is not pulled out once after being inserted. In the figure, the tapered portion 6 is formed so as to have small irregularities close to a low right triangle. But not limited to that,
A spherical conical shape as shown in FIG. 6 may be used. .

A hook 4 formed at one end of the tying cord 2
Is provided with a flat hole portion 5 through which the tying cord 2 can be inserted from the tapered portion 6 side, and a hooking piece 7 for hooking the small uneven portion 3 once inserted. To prevent slipping out. The latching piece 7 here is a plate-like member having a spring property integrally formed with the latching portion 4 and latches the small uneven portion 3 which is to be pulled out in the original direction.

However, the present invention is not limited to this. If the small uneven portion 2 of the tying cord 2 is spherical, as shown in FIG. Is also good. In that case, when the tapered portion side of the tying cord 2 is inserted through the hole 5 on the large diameter side of the hooking portion 4, the slit 10 is pushed open and passed, but once passed, The tip end of the conical cylindrical small-diameter side serves as a latching piece 7 to lock the spherical small uneven portion 2 from coming out in the original direction.

The tying cord 2 is inserted and fixed to the spacer body 1 as described above. This inserting and fixing means is used to insert the tying cord into the mold when the spacer body 1 is formed by mortar. Insert the part near the hook 4 of 2
The mortar is injected and cured, so that it is integrally molded and fixed. Further, as described above, it is desirable that a large number of the small uneven portions 3 be provided so as to come to the inner peripheral surface which comes into contact with the outer peripheral surface of the reinforcing bar 8.

As shown in FIGS. 1 to 4, the position of the spacer body 1 to which the tying cord 2 is inserted and fixed may be formed near the upper surface of the spacer body 1, but FIGS. It may be inserted and fixed in the center of the side of the spacer body 1 as shown by.

In order to use the spacer, at a concrete construction site, one side of the spacer body 1 is brought into contact with the concrete structure surface 9 or the formwork, and the reinforcing bar 8 is brought into contact with the other side. Closure cord 2 projecting upward or sideways
The tapered portion 6 side of the stop cord 2 is inserted into the hole 5 of the hooking portion 4 so as to surround the outer peripheral portion of the reinforcing bar 8 from both sides between the tapered portion 6 side and the hooking portion 4 side. .

In the above state, the tapered portion 6 is sufficiently pulled, the reinforcing bar 8 is tightened with the tying cord 2 and the hand is released. Since it is hung by the stop piece 7, the tying cord 2 is prevented from coming off. After that, if necessary, it is only necessary to cut off the tying cord 2 on the tapered portion 6 side remaining from the hooking portion 4 with a cutter or a special tool. Thus, the reinforcing bar 8 can be firmly held and fixed to the spacer.

As described above, the fastening string 2 of this spacer
Can be hooked at the hook 4 at an arbitrary position according to the outer diameter of the reinforcing bar 8 and prevented from falling out, so that it can correspond to the outer diameters of various types of reinforcing bars 8 used in concrete construction sites. This eliminates the need to prepare various types of spacers as in the related art.

As shown in FIG. 2, a number of small irregularities 3 formed over substantially the entire length of the tying cord 2 are firmly inserted into mortar or concrete when the spacer body 1 is formed and fixed. Therefore, the tying cord 2 does not come off from the spacer body 1. Therefore, rebar 8
Are firmly fastened to the spacer body 1 and are integrated.

Furthermore, if the small uneven portion 3 of the tying strap 2 is used in a state where it comes to the inner peripheral surface, each small uneven portion 3 comes into contact with the outer peripheral surface of the reinforcing bar 8. Is increased, and the rebar 8 fastened and fixed does not slip in the axial direction or rotate in the circumferential direction.

Further, since the material of the tying cord 2 of the spacer is made of nylon 6.6, no rust is generated even after a lapse of days after use, so that the strength of the concrete component is not affected. Since it itself has some elasticity, even if there is a vibration at the time of concrete injection or the like, the fastening string 2 absorbs the vibration and hinders fixing and holding of the reinforcing bar 8. No longer occurs.

The state of attachment between the spacer body 1 and the reinforcing bar 8 is not limited to the above-described example, but is held by the fastening string 2 so that the spacer body 1 is inclined with respect to the longitudinal direction of the reinforcing bar 8. There are various mounting modes such as tightening and fixing, but in any case, according to the reinforced concrete construction spacer according to the present invention, the fastening string 2 can easily and quickly perform the fastening operation.

[0043]

As is clear from the above, the reinforced concrete construction spacer according to the present invention can cope with various outer diameters of the rebar, and the rebar does not slip or turn carelessly and rust is generated. In addition, it has useful effects such as being able to cope with vibrations at the construction site and hardly causing loosening.

That is, there have been various types of reinforced concrete construction spacers as described above. However, the reinforcing bars and spacers are easy to come off during construction, it takes time and effort to close, and it is easy to rust, the reinforcing bars after closing are easy to slip in the axial or circumferential direction, and a springy metal wire for closing In addition, there are problems that various types of metal plates and metal plates need to be prepared in accordance with the outer diameter of the reinforcing bar, and concrete injection leakage easily occurs in a shadowed portion of the metal plate.

On the other hand, according to the present invention, a) the rebar is tightened only by pulling the locking tie protruding upward or to the side of the spacer main body through the tapered portion side of the locking portion side. Can be done, and in that state, it can be stopped. Therefore, the spacer and the reinforcing bar can be firmly held and fixed by a simple operation, and the closing operation at the concrete construction site becomes easy and quick, so that the workability can be improved.

(B) Since the spacer of the present invention can be hooked / removed at any position in a tightened state by the small uneven portion formed over substantially the entire length of the tying strap and the hooking portion, various types of external It can correspond to rebar of diameter. Therefore, there is no need to prepare spring-like metal wires or metal plates having different lengths and widths as in the related art, which is advantageous in manufacturing, management, and work. In addition, even when the tying string is left, it can be easily cut off with a cutter or a special tool as needed.

C) In the spacer of the present invention, a large number of small uneven portions of the tying strap are firmly inserted into mortar or concrete at the time of molding the spacer body, and are fixed. Does not fall out of the spacer body even if it is pulled. Therefore, the reinforcing bar and the spacer body can be firmly tightened and held and fixed.

D) Further, when the spacer of the present invention is used in such a state that the small uneven portion of the tying strap comes to the inner peripheral surface, each small uneven portion comes into contact with the outer peripheral surface of the reinforcing bar. The friction at the contact surface is increased, and the sliding of the rebar in the axial direction and the rotation in the circumferential direction can be prevented from this surface.

(E) Moreover, when the spacer of the present invention is made of a soft or semi-rigid synthetic resin such as 6.6 nylon, for example, the spacer itself has some elasticity. Therefore, even if there is vibration at the time of pouring concrete, etc., the tying strap absorbs the vibration and secures the reinforcing bar.
Retention is no longer impaired.

F) Since the material of the tying strap of the spacer of the present invention is made of rust-resistant metal or synthetic resin, rust does not occur even after construction, and the strength of the concrete component is reduced. Of course, it has no effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a use state using an embodiment of a concrete construction spacer according to the present invention.

FIG. 2 is an enlarged longitudinal sectional view of the one shown in FIG.

FIG. 3 is a perspective view showing an embodiment of the concrete construction spacer according to the present invention used in FIG. 1;

FIG. 4 is a concrete construction spacer according to the present invention;
It is a perspective view which shows the other Example from which the attachment state of a fastening string differs.

FIG. 5 is a concrete construction spacer according to the present invention;
It is a perspective view which shows another Example from which the shape of a spacer main body differs.

FIG. 6 is a concrete construction spacer according to the present invention;
It is a perspective view which shows another Example from which the shape of a fastening string differs.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1-Spacer main body 2-Fixing cord 3-Small uneven part 4-Hanging part 5-Hole 6-Tapered part 7-Hanging piece 8-Reinforcing bar 9-Structure surface 10-Split groove

Claims (3)

[Claims] 1. A tying cord 2 is fixed to a spacer body 1 with a tying cord 2 inserted therein. The tying cord 2 is made of a material having flexibility and rust resistance capable of being bent in the longitudinal direction. A plurality of retaining small concave / convex portions 3 over substantially the entire length, and a retaining retaining portion 4 capable of retaining with the small concave / convex portions 3 inserted into one side end; At the side end, a hole 5 of the hook 4
The spacer has a tapered portion 6 for insertion into a space, and a portion of the tying cord 2 near the hooking portion 4 is molded and fixed by being inserted into a mold at the time of molding the spacer body 1. , Spacer for reinforced concrete construction. 2. The cross-section 3 according to claim 1, wherein the tying strap 2 fixed to the spacer body 1 is formed in a band shape having a flat cross section, and the small uneven portion 3 is formed in a substantially triangular shape in a wavy shape.
Square reinforced concrete construction spacer. 3. The cross-section according to claim 1, wherein the tying strap 2 fixed to the spacer body 1 is formed in a string shape having a round cross section, and the small uneven portion 3 is formed in a rosary shape with a substantially spherical shape. Triangular reinforced concrete construction spacer.