JP2004225328A - Reinforcing bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeve holdable function for a reinforcing bar embedded near each opening part in forming a through hole in a beam, a wall, or the like of reinforced concrete building. <P>SOLUTION: This reinforcing bar is composed of a reinforcing frame member 1 formed of one or a plurality of reinforcements annularly provided with a size larger than the opening part of the through hole, and a sleeve holding means 2 provided at the reinforcing frame member 1 to support a sleeve S for impeding the inflow of concrete to a through hole forming part. The sleeve holding means 2 is composed of a plurality of holding arms 3 fixed so that the tip parts point to the inside of the reinforcing frame member 1, and one or a plurality of locking members 4 provided in a freely advancing/retreating manner in relation to the tip part of the holding arm 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reinforcing bar buried in the vicinity of both openings of a through hole when forming a through hole in a beam, a wall, or the like of a concrete building. The present invention relates to a reinforcing bar provided with a holding means capable of holding a sleeve for blocking.
[0002]
[Prior art]
To form through-holes for passing various pipes through beams and walls of reinforced concrete buildings, first support a cylindrical sleeve made of paper pipe or vinyl chloride pipe with rebar, and then install the formwork. , Concrete is driven into the form from above the sleeve. Then, by removing the form after the concrete is solidified, a through hole is formed at the sleeve installation position, and the sleeve is extracted or fixed in place. Then, after passing the target pipe through the formed through-hole, concrete is again driven into the through-hole as necessary, and a series of operations is completed.
[0003]
By the way, in order to secure the strength of the periphery of the opening of the through hole, reinforcing bars for the through hole are widely used today. Reference numeral 10 shown in FIG. 7 is a reinforcing bar for a through hole. The reinforcing bar 10 has an annular reinforcing member having an appropriate size through which the sleeve S can be inserted, and two support members which contact the lower side of the sleeve S. And a foot.
[0004]
In order to install the reinforcing bar 10 and the sleeve S with respect to the reinforcing bar, a pair of reinforcing bars 10 are respectively passed near both ends of the sleeve S, and both ends of the sleeve S are respectively placed on the supporting feet of the reinforcing bar 10. Each part where the reinforcing bar 10 and the reinforcing bar overlap is connected by a plurality of binding wires made of wires or strings. Then, by embedding the reinforcing bars 10 together with the plurality of binding wires in concrete, the strength of the corresponding portion is ensured.
[0005]
[Non-patent document 1]
Japanese Patent Application Laid-Open No. 2000-136597 [Non-Patent Document 2]
JP-A-11-193599
[Problems to be solved by the invention]
However, the conventional sleeve reinforcing bars have the following disadvantages.
As shown in FIG. 7, the sleeve S placed on the reinforcing bar 10 is displaced when the concrete is driven in, and this causes a serious problem that cannot be overlooked that the through hole formed in the beam or the like is displaced. Sometimes do.
[0007]
That is, the reinforcing bar 10 is fixed to the reinforcing bar by a plurality of binding wires. However, the sleeve S is in an unstable state only on the two supporting legs of the reinforcing bar 10, so that the concrete in this state. , The sleeve S swings right and left and back and forth by the fluid pressure of the concrete. When the concrete is driven until it reaches the lower end of the sleeve S, the sleeve S, which is lighter than the concrete, rises to the upper surface of the concrete and moves upward with the rise of the upper surface of the concrete.
[0008]
In order to solve such inconvenience, conventionally, as shown in FIG. 8, an iron bar 11 which is sufficiently longer than the width of the reinforcing bar 10 is prepared, and the central portion of the iron bar 11 is brought into contact with the upper end of the sleeve S. Each part where the steel bar and the reinforcing bar overlap is connected and fixed by a plurality of binding wires. That is, measures are taken to prevent the sleeve S from swinging or moving even during concrete driving by firmly fixing the sleeve S to the reinforcing bar by both the reinforcing bar 10 and the iron bar 11. .
[0009]
However, in order to prepare a plurality of iron rods 11 as shown in FIG. 8 in advance and to fix the iron rods 11 to the rebar in a state where the iron rods 11 are in contact with the sleeve S, it is necessary to perform a complicated and time-consuming operation. This was a factor that reduced the efficiency of installation work.
[0010]
In addition to the above-described problem at the time of the operation, there is also a problem that the presence of the iron bar 11 for fixing the sleeve S reduces the durability of the building. That is, since the iron bar 11 is in contact with the upper end of the sleeve S, the surface of the iron bar 11 is partially exposed on the inner wall surface (upper center) of the through hole formed when the sleeve S is extracted after the concrete is solidified. It becomes. In other words, there is a problem that the thickness of concrete, which is referred to by those skilled in the art as “cover thickness”, cannot be secured between the iron bar 11 and the concrete surface. There is a possibility that the corrosion may progress.
[0011]
On the other hand, the conventional reinforcement has the following problems. Conventionally, reinforcing bars of various sizes are provided in accordance with the width of the sleeve S, in other words, the inner diameter of the through hole to be formed, and it is necessary to appropriately use them depending on each site and each location. That is, it is impossible to insert and install a large sleeve inside a small reinforcing bar, and conversely, if a small sleeve is installed by a large reinforcing bar, the sleeve cannot be installed at the center position in the reinforcing bar. (Below the center).
[0012]
For this reason, it is necessary to bring in the site after calculating beforehand how many large and small reinforcing bars 10 corresponding to each through hole to be formed are required at each site and at each location, and neglecting this. Or, if it is wrong, the progress of the work will be significantly hindered.
[0013]
[Means for Solving the Problems]
The reinforcing bars according to the present invention have been made in order to solve the above-mentioned conventional problems, and the reinforcing bars are provided as one or more annular members having a size larger than the opening of the through hole. It comprises a reinforcing frame member made of a reinforcing bar, and sleeve holding means provided on the reinforcing frame member and supporting a sleeve for preventing concrete from flowing into the through hole forming portion.
[0014]
A plurality of fixed arms fixed to the reinforcing frame member so that the distal ends are directed inward of the reinforcing frame member, and the sleeve holding means is provided on the fixed arm and directed inward or outward of the reinforcing frame member. An object of the present invention is to solve the above-mentioned conventional problem by comprising one or a plurality of locking members which can move forward and backward so that the outer periphery of the sleeve can be held by the sleeve holding means.
[0015]
The fixed arm including the locking member may be configured such that one side of the locking member and the fixed arm is formed by a screw rod, and the other side is formed by a nut-shaped member that is screwed into the screw rod. Is rotated to move the locking member forward and backward.
[0016]
Further, the locking member of the sleeve holding means is formed of a non-corrosive material, or the leading end portion of the locking member is covered with a non-corrosive material so that the rebar is not exposed from the concrete surface after the sleeve is extracted. To be configured.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing one embodiment of a reinforcing bar according to claims 1 to 3 of the present invention.
[0018]
FIG. 1 is a front view showing the entire reinforcing bar. In FIG. 1, reference numeral 1 denotes a reinforcing frame member. The reinforcing frame member 1 has an annular shape having an inner diameter equal to or larger than the opening of a through hole formed in a concrete beam surface or the like. In this example, two octagonal annular reinforcing bars are used.
The shape of the reinforcing frame member is not limited to this, and may be any shape such as a combination of a plurality of elliptical rebars, and a shape formed by bending a single rebar a plurality of times at appropriate lengths. It may be.
[0019]
On the other hand, reference numeral 2 denotes a sleeve holding means provided on the reinforcing frame member 1. The sleeve holding means 2 is composed of three fixed arms 3 made of an iron rod welded to the reinforcing frame member such that their tips are directed inward of the reinforcing frame member 1 and one fixed arm 3 (upper in the figure). And a locking member 4 provided at the distal end of the fixed arm.
In the illustrated sleeve holding means 2, an example is shown in which three fixed arms 3 are provided and one locking member 4 is provided, but the number of fixed arms 3 and the number of locking members 4 are not limited thereto. Instead, it may be added as needed.
[0020]
In the sleeve holding means 2, caps 5 made of a non-corrosive material are attached to the tips of the other fixed arms 3 (the left and right fixed arms in the figure) on which the locking member 4 is not provided. , So that the distal end of the fixed arm 3 made of a reinforcing bar is not exposed. The material of the cap 5 is not particularly limited as long as it is a non-corrosive material. For example, the cap 5 is formed of a resin material or concrete or mortar having a hardness equal to or higher than that of the concrete to be poured. You may.
[0021]
The locking member 4 is movable forward and backward from the distal end of the fixed arm 3. As shown in FIG. 2, the fixed arm 3 having the locking member 4 is formed by a screw bar, and the locking member 4 has a nut-shaped inner wall portion screwed to the screw bar, and the tip is rounded. Shape.
In other words, the sleeve holding means 2 can move the locking member 4 forward or backward as shown by the arrow by rotating the locking member 4 in the left or right direction with a fingertip or the like without using any special tool. Is possible.
[0022]
The locking member 4 is also made of a non-corrosive material like the cap 5.
[0023]
The reinforcing bar having the above-mentioned sleeve holding means 2 can easily and quickly hold the sleeve. That is, in order to hold the sleeve, as shown in FIG. 3, the sleeve S is first passed through the three fixed arms 3 and placed on the lower left and right fixed arms 3, and then the locking member 4 is moved in the predetermined direction. And the tip of the locking member 4 may be brought into contact with the outer peripheral surface of the sleeve S. As a result, the sleeve S is firmly supported from up, down, left and right directions, and is held without swinging or moving in any direction.
[0024]
The reinforcing bars are buried in the concrete together with the reinforcing bars, and even when the sleeve S is extracted after the concrete is solidified, the cap 5 or the locking means 4 made of a non-corrosive resin material is provided at the tip of each fixed arm 3. Since each of the reinforcing bars is provided, the reinforcing bars are not exposed from the concrete surface, and corrosion that progresses from the exposed portions of the reinforcing bars can be prevented.
[0025]
On the other hand, FIG. 4 is a cross-sectional view showing a second embodiment of the sleeve holding means 2 installed on a reinforcing bar. In the sleeve holding means 2 shown in FIG. 4, a fixed arm 3 fixed to the reinforcing frame member 1 is formed by a nut-shaped member, and the locking member 4 is formed by a screw rod screwed to the fixed arm 3.
In this example, the locking member 4 made of a screw rod is made of a metal rod, and a cap 5 made of a non-corrosive material is provided at a tip portion. An engagement groove for a driver is formed at the rear end (upper end in the figure) of the locking member 4 so that the engagement member 4 can easily move forward and backward by using a manual driver or an electric screwdriver.
[0026]
FIG. 5 is a sectional view showing a third embodiment of the sleeve holding means 2 installed on a reinforcing bar. The sleeve holding means 2 shown in FIG. 5 includes a rotary knob member 6 for screwing a screw portion into a screw hole formed near the distal end of the fixed arm 3, and a slit for inserting the screw portion of the rotary knob member 6. And a locking member 4 provided with an engaging member 4a.
The slit 4a of the locking member 4 is formed in the longitudinal direction of the fixed arm 3, so that the locking member 4 can advance and retreat as indicated by the arrow. Then, the locking member 4 can be fixed at a predetermined position by tightening the locking member 4 to the fixed arm 3 by the rotary knob member 6.
[0027]
This sleeve holding means 2 can also hold the sleeve S quickly and easily without using any special tool, similarly to the above-mentioned sleeve holding means 2 shown in FIG.
[0028]
FIG. 6 is a front view showing another embodiment of the reinforcing bars according to claims 1 to 3 of the present invention. Next, the reinforcing bars will be described with reference to FIG. The same portions as those of the reinforcing bars described with reference to FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description will be omitted.
[0029]
The sleeve holding means 2 provided on the reinforcement shown in FIG. 6 includes three fixed arms 3 and three locking members 4 provided at the tips of the fixed arms 3 respectively. I have.
[0030]
It is needless to say that the reinforcing bars can be firmly clamped without moving the sleeve S by the sleeve holding means 2 similarly to the above-described reinforcing bars. Further, the reinforcing bars are sleeves S having different sizes. Also has the advantage that it can be properly supported.
That is, the width (inner diameter) between the locking means 4 provided on each of the three fixed arms 3 can be easily changed by appropriately changing the length of advancement, so that a small sleeve can be used. Regardless of the size of the sleeve up to the large sleeve, even if the sleeve is any, it is possible to hold firmly at the center position of the reinforcing bar.
[0031]
As a result, the same reinforcing bars can be used for the large and small sleeves within the range permitted by the structural plan, and work efficiency can be improved by omitting the trouble of facilitating large and small reinforcing bars of different sizes, for example. It is possible.
[0032]
The sleeve holding means 2 installed on the reinforcing bar may be any one of the sleeve holding means 2 shown in FIGS. 2, 4 and 5, or may be a combination thereof.
[0033]
Although the reinforcing bars shown in FIGS. 1 and 6 each have an example in which three fixed arms are provided, the number of fixed arms is not limited to this, and the number of locking members 4 is also limited. It is needless to say that it may be added as needed.
[0034]
【The invention's effect】
As described above, the reinforcing bar according to the present invention is provided with a sleeve holding means for the reinforcing frame member, and a plurality of fixed arms fixed to the sleeve holding means inward of the reinforcing frame member. Since it is constituted by one or a plurality of locking members provided to be able to advance and retreat with respect to the distal end of the fixed arm, the following various effects can be obtained.
[0035]
According to this reinforcing bar, the sleeve can be firmly clamped from the outer peripheral direction of the sleeve by the sleeve holding means, whereby the swinging and movement of the sleeve during concrete driving can be completely prevented, and the displacement of the through-hole forming position can be reduced. It can be eliminated.
[0036]
In addition, the complicated work of fixing the sleeve using the iron bar can be omitted, and the problem of the iron bar being exposed from the concrete surface can be solved by the non-corrosive material provided on the fixing arm and the locking member. With the improvement, it is possible to secure the durability of the building.
[0037]
On the other hand, by providing a locking member for each of the plurality of fixed arms, even large and small sleeves having different sizes can be firmly held at the center position of the reinforcing bar. As a result, the same reinforcing bars can be used for the large and small sleeves within the range permitted by the structural plan, and the work efficiency can be improved by eliminating the trouble of preparing large and small reinforcing bars. .
[Brief description of the drawings]
FIG. 1 is a front view showing one embodiment of a reinforcing bar according to claims 1 to 3 of the present invention.
FIG. 2 is a cross-sectional view showing a configuration example of a sleeve holding means provided for the reinforcing bars shown in FIG.
FIG. 3 is a front view showing a state where the sleeve is held by the sleeve holding means of the reinforcing bar shown in FIG. 1;
FIG. 4 is a sectional view showing another embodiment of the sleeve holding means installed on the reinforcing bar.
FIG. 5 is a sectional view showing another embodiment of the sleeve holding means installed on the reinforcing bar.
FIG. 6 is a front view showing another embodiment of the reinforcing bars according to claims 1 to 3 of the present invention.
FIG. 7 is an external perspective view showing a state where a sleeve is held on a reinforcing bar by a conventional reinforcing bar.
FIG. 8 is a front view showing a state where the sleeve is held by the conventional reinforcing bars and the iron bar shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement frame member 2 Sleeve holding means 3 Fixed arm 4 Locking member S sleeve

Claims (3)

When forming a through hole in a beam or the like of a concrete building, it is a reinforcing bar buried respectively near both openings to ensure strength,
This reinforcement,
A reinforcing frame member made of one or more reinforcing bars provided in a ring shape having a size equal to or larger than the opening of the through hole,
Sleeve holding means provided on the reinforcing frame member and supporting a sleeve for preventing inflow of concrete into the through-hole forming portion,
Composed by
The sleeve holding means,
A plurality of fixed arms fixed to the reinforcing frame member so that the tip is directed inward of the reinforcing frame member,
One or a plurality of locking members provided on the fixed arm and capable of moving forward and backward in or out of the reinforcing frame member,
Characterized in that the outer periphery of the sleeve is held by the sleeve holding means. The fixed arm including the locking member is configured such that one side of the locking member and the fixed arm is configured by a screw rod, and the other side is configured by a nut-shaped member screwed to the screw rod, and the locking member is rotated. The reinforcing bar according to claim 1, wherein the engaging member is configured to move forward and backward by causing the engaging member to move forward and backward. 3. The reinforcing bar according to claim 1, wherein the locking member of the sleeve holding means is formed of a non-corrosive material, or a tip portion of the locking member is covered with a non-corrosive material.

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