JP2002047796A - Sleeve fixture and method for forming through hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve fixture which can easily and accurately position a sleeve being different in pipe diameter, ensures the thickness of cover concrete as appropriate with respect to a reinforcement, and eliminates a fear of corrosion of the reinforcement. SOLUTION: The sleeve fixture 1 is formed of a synthetic resin having suitable flexibility. A clip portion 2 having an almost C-shaped cross section, which is formed at one end of the fixture is fitted onto the reinforcement R and mounted on the same. Then, the sleeve S is fitted into an almost C-shaped sleeve holding portion 5 formed via an arm portion 4 sideways protruding from the clip portion 2. Thus, the sleeve S is held in a direction perpendicular to the reinforcement R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve fixing device for fixing a sleeve for piping and wiring in a beam or wall form when concrete is poured in a construction work or the like, and to use this sleeve fixing device. And a method for constructing the through hole.

[0002]

2. Description of the Related Art Through beams (including foundation beams) and walls of a reinforced concrete building are provided with through holes for passing pipes for water, gas, air and the like and electric wiring. This through-hole is usually formed by mounting a cylindrical sleeve made of a paper tube or a vinyl chloride tube in advance at a predetermined position in a beam or wall formwork, and casting concrete there. The sleeve must be securely fixed in the formwork so that the concrete does not move due to the weight or buoyancy of the concrete when the concrete is poured or the concrete flows into the sleeve.

Conventionally, to fix a sleeve in a mold,
A method has been adopted in which a sleeve is bound to a reinforcing bar in a formwork with a wire or a string. However, it is difficult to properly position the sleeve by the binding method, and the work on site is troublesome. In addition, there is also an inconvenience that the corrosion of the reinforcing bar tends to progress due to the contact of the dissimilar metal between the wire used for binding and the reinforcing bar.

Further, if the sleeve is tied in a state of being in contact with the reinforcing bar, the tying operation is facilitated, but there is also a disadvantage that the cover thickness of the concrete cannot be sufficiently secured between the reinforcing bar and the sleeve. This is described in, for example,
-Fixing tool 91 disclosed in Japanese Patent No. 336320
The same applies to the case where the sleeve S is fixed to the reinforcing bar R using (FIG. 5).

[0005] As another method for fixing the sleeve, a method disclosed in Japanese Patent Application Laid-Open No. Hei 3-17352 is also known. As shown in FIG. 6, a sleeve holder 92 is fixed to a frame member P facing the mold with needle-shaped fasteners, and a double stretchable telescopic member is provided between the sleeve receivers 92. The sleeve S is attached. However, in this mounting method, the number of components to be used is large, and it is very difficult to work in a narrow space inside the mold, especially near the bottom of the mold. In addition, since the diameter of the sleeve receiver 92 and the diameter of the sleeve S must correspond to each other, there is also an inconvenience that it is not possible to satisfactorily cope with various sleeves whose pipe diameters are not uniform among the contractors.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and can easily and accurately position even sleeves having different pipe diameters in a mold. It is another object of the present invention to provide a sleeve fixing device capable of appropriately securing the cover thickness of the concrete with respect to the reinforcing bar and having no fear of corroding the reinforcing bar, and a method of forming a through hole using the fixing device.

[0007]

In order to solve the above-mentioned problems, a sleeve fixing device of the present invention is made of a synthetic resin having flexibility and has a clip portion having a substantially C-shaped cross section which can be attached to a reinforcing bar. And a substantially C-shaped sleeve holding portion provided continuously to the arm portion and holding the sleeve in a direction perpendicular to the reinforcing bar.

[0008] Since this sleeve fixing member is made of synthetic resin, it does not affect the corrosion of the reinforcing bar. By giving the synthetic resin an appropriate flexibility, it can be attached to an arbitrary position of the reinforcing bar via the clip portion. be able to. Further, even sleeves having different pipe diameters can be easily attached to the sleeve holding portion. Further, since the clip portion and the sleeve holding portion are connected via the arm portion, the cover thickness of the concrete with respect to the reinforcing steel can be appropriately secured by the length of the overhang of the arm portion.

As the synthetic resin to be used as the material, many thermoplastic resins having appropriate flexibility such as polypropylene can be used. In addition, reactive resins such as polyurethane, elastomer, and hard rubber can also be used.

[0010] By forming guide lip portions which are folded back in the widening direction at the opposite opening edge portions of the clip portion, it becomes easy to fit a reinforcing bar into the clip portion.

[0011] Further, by forming hook portions which are folded back in the widening direction at the opposite opening edge portions of the sleeve holding portion, it becomes easy to fit the sleeve into the sleeve holding portion. This hook portion can also be used to bind the hook portions together with a wire or a string when the sleeve having a large diameter is fitted into the sleeve holding portion, to strengthen the restraint of the sleeve.

Further, in the sleeve fixing device of the present invention, the clip portion is formed with respect to an imaginary plane including the axis of the sleeve held by the sleeve holding portion and orthogonal to the axis of the reinforcing bar on which the clip portion is mounted. It can be configured to be provided at the offset position. According to the present invention, even when two sleeve fixing members are attached to both sides of the same reinforcing bar, the heights of the axes of the two sleeves held by the sleeve holding portions can be made uniform.

Further, in the method of forming a through hole according to the present invention, the clip portion of the sleeve fixing device is attached to at least one reinforcing bar arranged in the formwork, and the sleeve is mounted on the sleeve holding portion of the sleeve fixing device. After fixing the form by attaching the inner surfaces of the form opposite to both open ends of the sleeve, concrete is poured into the form, and the sleeve and the sleeve fixing device are embedded in the concrete. It is characterized by being fixed. Thereby, a through hole can be efficiently formed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a sleeve fixing device 1 of the present invention, and FIG. 2 is a perspective view showing a basic mounting state of a sleeve S using the sleeve fixing device 1.

The sleeve fixing device 1 is made of a recycled material of a thermoplastic resin such as polypropylene, and is integrally formed by injection molding.
Has moderate flexibility.

One end of the sleeve fixture 1 has a reinforcing bar R
A clip portion 2 formed so as to be fitted is provided. The clip portion 2 has a substantially C-shaped cross section in which a part of the peripheral surface of the cylinder is opened, and is formed such that the inner diameter is slightly smaller than the outer diameter of the reinforcing bar R to be fitted. The opposite ends of the opening of the clip portion 2 have reinforcing bars R
The guide lip portions 3 and 3 are formed so as to be folded back in the widening direction in order to facilitate the fitting.

An arm portion 4 is formed continuously with the clip portion 2 and projects to the side of the clip portion 2. The cross section of the arm part 4 is formed in a substantially cross shape, and the rigidity is enhanced.

At the front end of the arm portion 4, a sleeve holding portion 5 having a substantially C shape in a front view is provided. Sleeve holding part 5
Has a shape in which a part of the peripheral surface of a short cylinder is opened, and its axis C ₅ is the axis C of the reinforcing bar R fitted into the clip portion 2.
It is connected to the arm 4 so as to be orthogonal to r.
The inner diameter of the sleeve holding portion 5 is formed to be about 10% smaller than the outer diameter of the sleeve S to be held, so that the diameter is expanded with appropriate flexibility. A rib 6 for reinforcement is formed on the outer peripheral surface of the sleeve holding portion 5 so as to be continuous with the arm portion 4.

Hook portions 7 and 7 which are folded back in the widening direction are formed at opposite open end edges of the sleeve holding portion 5 to facilitate the fitting of the sleeve S. This hook portion 7 is used to bind the hook portions 7 with each other with a wire or a string to strengthen the restraint of the sleeve S when the sleeve S having a large diameter is fitted into the sleeve holding portion 5. Can be.

Since the sleeve fixing device 1 is configured as described above, it can be attached to an arbitrary position of the reinforcing bar R via the clip portion 2. In the construction work and the like, the positions where the through holes are provided vary widely depending on the locations and uses. Therefore, for example, in the case of a beam, if the sleeve fixing device 1 can be attached only to the main muscle or the abdominal muscle arranged horizontally, it is inconvenient to adjust the height direction of the through hole. However, since the sleeve fixing tool 1 of the present invention can be mounted on the reinforcing bars R arranged horizontally and also on the reinforcing bars R arranged vertically (for example, stirrups of beams), positioning of the through-holes is performed. Gives a great degree of freedom.

Further, since the sleeve fixing device 1 is formed so as to hold the outer peripheral surface of the sleeve S by utilizing the flexibility of the sleeve holding portion 5, the sleeve fixing device 1 is provided within a certain range in which the shape of the resin can be restored. Thus, sleeves S having different pipe diameters can be fixed. Further, since any position on the outer peripheral surface of the sleeve S can be held, it can be used irrespective of the concrete thickness of the mounting portion. When the concrete thickness is large, that is, when the pipe length of the sleeve S is long, the sleeve S is attached at a distance in the pipe length direction.
It is also possible to hold the sleeve S with more than one sleeve fixture 1.

Further, this sleeve fixing tool 1 is
Since the clip portion 2 attached to the clip portion 2 and the sleeve holding portion 5 for holding the sleeve S are connected via the arm portion 4, the reinforcing bar R to which the clip portion 2 is attached has the length of the overhang of the arm portion 4. The cover thickness of concrete is properly secured by the amount.

A method of forming a through hole using the sleeve fixing device 1 is as follows.

First, the reinforcement of the beams and walls is assembled, and the sleeve panel is fixed to at least one reinforcing bar R in a state where the form panel has not been built yet or only one side of the facing form panel has been built. The clip portion 2 of the tool 1 is mounted, and the sleeve S is fitted into the sleeve holding portion 5 to position the sleeve S. Next, the form panels opposed to the both open ends of the held sleeve S are respectively brought into contact with each other, and the form is fastened and fixed with a foam tie or other supporting material. Then, concrete is poured into the formwork, and the sleeve S and the sleeve fixing tool 1 are embedded and fixed in the concrete. If the mold is released after the concrete is hardened, a through hole is formed in the sleeve S. As described above, by using the sleeve fixing tool 1 of the present invention, it is possible to position the sleeve S extremely easily and accurately without using a tool.

Incidentally, this sleeve fixing device 1 is shown in FIG.
As shown in FIG. 5, when a virtual plane H including the axis Cs of the sleeve S held by the sleeve holding portion 5 and orthogonal to the axis Cr of the reinforcing bar R to which the clip portion 2 is attached is assumed, The two end faces are formed so as to coincide with the virtual plane H. That is, the clip unit 2
The shape of the arm portion 4 is designed so as to be offset from a horizontal plane (virtual plane H) passing through the axis Cs of the sleeve S. Therefore, as shown in FIG. 3, the two sleeve fixing tools 1, 1
When attached to both sides of the sleeve fixing tool 1, 1
The heights of the shaft centers Cs, Cs of the sleeves S, S, which are held at the same position, automatically coincide with each other. Thereby, the heights of the two through holes formed adjacent to the beam or the wall can be easily adjusted.

FIG. 4 shows another embodiment of the sleeve fixing device of the present invention.

In the sleeve fixing device 10, the peripheral length of the sleeve holding portion 50 is formed so as to hold approximately 1/2 of the outer circumference of the sleeve S. Then, adjacent reinforcing bars R, R
The two sleeve fixing devices 10, 10 are mounted in pairs between them, and used to hold the sleeve S between the opposing sleeve holding portions 50, 50. in this way,
Depending on the pipe diameter of the sleeve S and the interval between the reinforcing bars R, the sleeve S can be further firmly fixed by using two or more sleeve fixing devices 10.

[0029]

As described above, the sleeve fixing device of the present invention can be attached to an arbitrary position of the reinforcing bar via the clip portion, and even a sleeve having a different pipe diameter can be easily fitted into the sleeve holding portion. The positioning of the sleeve becomes extremely easy. Further, since an arm is provided between the clip portion and the sleeve holding portion, and the reinforcing bar and the sleeve are held apart by the length of the arm portion, it is necessary to properly secure the cover thickness of the concrete to the reinforcing bar. Can be.

Further, by forming a guide lip portion at the opposite opening edge portion of the clip portion or forming a hook portion at the opposite opening edge portion of the sleeve holding portion, the reinforcing bar or the sleeve can be easily fitted. Become. When the sleeve has a large pipe diameter, the hook portions facing each other are bound by a wire or a string, so that the sleeve can be more firmly restrained.

Further, by forming the clip portion so as to be offset with respect to the axis of the sleeve held by the sleeve holding portion, the two adjacent sleeves are made to have the same height via the same reinforcing bar. Can be attached to

Further, according to the method of forming a through-hole of the present invention, the operation of fixing the sleeve in the mold by using the sleeve fixing tool is made much more efficient, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a sleeve fixing device of the present invention.

FIG. 2 is a perspective view showing an attached state of a sleeve using the sleeve fixing tool.

FIG. 3 is an explanatory diagram showing an attached state when two adjacent sleeves are attached to the same reinforcing bar.

FIG. 4 is an explanatory view showing another embodiment of the sleeve fixing device of the present invention.

FIG. 5 is a perspective view showing an example of a sleeve fixing device according to a conventional technique.

FIG. 6 is a sectional view of a mold showing another example of the sleeve fixing device according to the related art.

[Explanation of symbols]

 1, 10 Sleeve fixing device 2 Clip portion 3 Guide lip portion 4 Arm portion 5, 50 Sleeve holding portion 7 Hook portion Cr Rebar axis Cs Sleeve axis H Virtual plane R Rebar S sleeve

Claims (5)

[Claims] 1. A clip portion made of a synthetic resin having flexibility and having a substantially C-shaped cross section which can be attached to a reinforcing bar, an arm portion projecting to the side of the clip portion, and provided continuously to the arm portion. And a substantially C-shaped sleeve holding portion for holding the sleeve in a direction perpendicular to the reinforcing bars. 2. On the opposite opening edge of the clip portion,
The sleeve fixing device according to claim 1, wherein guide lip portions that are folded back in the widening direction are formed. 3. The sleeve fixing device according to claim 1, wherein hook portions that are folded back in the widening direction are formed at opposite opening edge portions of the sleeve holding portion. 4. The clip portion is provided at a position offset from an imaginary plane including the axis of the sleeve held by the sleeve holding portion and orthogonal to the axis of the reinforcing bar on which the clip portion is mounted. 3. The method according to claim 1, wherein
Or the sleeve fixing device according to 3. 5. A clip portion of the sleeve fixing device according to claim 1 is attached to at least one reinforcing bar arranged in a formwork, and a sleeve is attached to a sleeve holding portion of the sleeve fixing device. After fixing the form by bringing the opposing inner surfaces of the form into contact with the open ends, concrete is poured into the form, and the sleeve and the sleeve fixing device are embedded and fixed in the concrete. Method of constructing through holes.