JPH0681482A - Insert nut fixing device, and structure of insert nut fixing part of concrete form - Google Patents

Abstract

PURPOSE:To facilitate works for fixing an insert nut, and to improve safety by a method wherein a fixing device that is made of an elastic body and is made up in a thin cylindrical shape with its front end opened is fixed so that it can project to the inside of a form. CONSTITUTION:A fixing device 1 for fixing an insert nut 3 is made of an elastic body such as rubber or soft resin and is made up in a thin cylindrical shape with its front end opened. Then, a bolt 4 is inserted through holes 10, 11 provided respectively to the rear end of the fixing device 1 and a form 8, and the fixing device 1 is mounted so that it can project to the inside of the form 8. A hole 2 of the insert nut 3 is then fitted to the fixing device 1 that is projecting to the inside of the form 8. In mounting the fixing device 1, an elastic washer 7 is fitted to the exterior side of the form 8, and the fixing device 1 is mounted so that it can be retreated freely toward the outside of the form. Thereby works for removing the form can be executed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert nut mounting tool for mounting an insert nut on a concrete form for embedding it in a concrete product, and a structure of an insert nut mounting portion of the concrete form.

[0002]

2. Description of the Related Art Insert nuts are embedded in concrete products for various purposes such as hoisting concrete products and connecting concrete products. Such an insert nut is embedded by pouring and hardening concrete into the mold while being mounted on the inner surface of the mold in advance.

5 and 6 are explanatory views showing the structure of a nut embedding portion of a conventional concrete formwork. A mold frame hole 32 is opened in the mold frame 30 at a position where the insert nut 31 is embedded, and as shown in FIG. 5, a bolt 33 is passed through the mold frame hole 32 from the outside and the insert nut 31 is screwed from the inside. To fix. After pouring concrete and hardening it, the bolt 33 is removed with an impact wrench or the like, and the mold is demolded as shown in FIG.

[0004]

The structure of the insert nut embedding portion of the conventional concrete formwork has the following drawbacks. The work of screwing the bolt when fixing the insert nut and the work of removing the bolt with an impact wrench when releasing the mold are complicated and work efficiency is poor. When the mold is large, fixing the insert nut requires two workers, a person who screws the bolt outside the mold and a person who holds the insert nut inside the mold. When fixing the insert nut with bolts from the lower side of the formwork, it is dangerous because an operator must slip into the lower side of the formwork. The present invention solves such problems,
It is intended to provide a structure of an embedded portion of an insert nut of a concrete product which is easy and has little danger.

[0005]

DISCLOSURE OF THE INVENTION The present invention is an insert nut fitting which is made of an elastic material such as rubber or soft resin and is formed in a thin-walled cylindrical shape with an open end, and
The insert nut mounting part of the concrete formwork is characterized in that the thin-walled cylindrical fitting for inserting the insert nut, which is made of an elastic body such as rubber or soft resin and has an open end, is projected to the inner surface of the formwork. It is a structure.

The fixture is usually attached to the mold with bolts. In this case, if a washer made of a soft resin is interposed on the outer surface of the mold, a unique effect is obtained as described later. It is also possible to attach the fixture to the outside of the mold so as to be retractable, and this will have a more specific effect by using a toggle clamp, as shown in the embodiment.

[0007]

The present invention has the above-described structure, and by mounting a thin-walled cylindrical fixture made of an elastic body with an open end protruding to the inner surface of the formwork, the insert nut formwork in a concrete production line can be used. Can be easily attached by pushing the hole of the insert nut so as to fit it into the fixture protruding to the inner surface of the mold. The fitting is made of an elastic body such as soft resin or rubber, and has a thin-walled cylindrical shape with an open tip, so it has a lot of elasticity, and the insert nut can be easily fitted, and not only the screw thread is not damaged. The insert nut does not easily come off even when impacted during concrete pouring or compaction. Also, there is no concrete leakage into the insert nut. At the time of demolding, only the mold is separated from the concrete surface, the fixture is separated together with the mold, and only the insert nut remains and is embedded in the concrete.

When the fixture is attached to the mold with bolts, if a washer made of a soft resin is interposed on the outer surface of the mold, the elasticity of the washer causes the fixture to be displaced relative to the mold to some extent. Therefore, as shown in Fig. 2, even when the mold is released by opening the mold centering on the hinge, the elasticity of the fixture itself contributes to the easy removal of the fixture without removing it from the mold. Can be molded.

When the mounting tool is retractably attached to the outside of the mold, the mounting tool is retracted at the time of demolding, so that any demolding method can be supported. For example, it can also be used in the case of moving a concrete product in a direction substantially parallel to the surface of a mold to remove the mold.

[0010]

1 and 2 relate to an embodiment of the invention. The fixture 1 is an embodiment of the present invention and is made of nylon resin and has a thin cylindrical shape. The peripheral wall portion has an average thickness of about 1 millimeter, and the rear end blocking wall portion has a thickness of about 2.5 millimeters. The average thickness of the peripheral wall portion varies depending on the size of the insert nut to be attached, but it is 3 to 10 times the inner diameter of the insert nut because of the elasticity of the fixture.
Percentage is appropriate. If this thickness is too thin, it becomes weak against impact when concrete is poured, and if it is too thick, it becomes difficult to insert and remove the insert nut. The outer circumference of the peripheral wall part is slightly tapered near the tip, and the tip is slightly thinner than the inner diameter of the insert nut 3 (inner method of the thread) and is the diameter invocation part, from the center to the rear end. The inner diameter of the insert nut 3 is slightly larger than that of the insert nut 3 so that the thread of the insert nut can bite into the insert nut 3 for firm fitting. A hole 2 for mounting a bolt is provided in the closing wall at the rear end of the fixture 1.

The mold 8 is provided with holes 10 and the holes 1 are provided on the outside.
The backing plate 9 with 1 is welded. The hole 10 is formed in such a size that the washer 7 can be inserted therein, and the hole 11 is formed slightly larger than the diameter of the bolt 4. As shown in FIGS. 1 and 2, the fixture 1 is attached to a mold 8 by bolts 4 and nuts 5 via a nylon resin washer 7, an elastomer washer 6 and the like.

The insert nut 3 is for M16 bolts, has a cylindrical shape, and has threads formed on the inner surface. The insert nut 3 is attached to the fixture 1 by pushing the fixture 1 protruding from the inner surface of the mold 8 from the inside and fitting it. The tip of the fitting 1 is slightly thinner than the inner diameter of the insert nut, and the fitting itself is elastic, so that the fitting is easy. Further, since the inner diameter of the insert nut is slightly thicker from the central portion to the rear end of the fitting 1, the thread of the insert nut bites into the outer peripheral surface of the fitting 1 and is firmly fitted therein. Due to the elasticity of the fixture, the thread is not damaged and concrete does not enter the insert nut 3.

Concrete is put into the mold, and after hardening, the mold is removed. As shown in FIG. 2, the demolding is performed by opening the mold frame 8 around the hinge 12 in the arrow A direction. The fixture 1 moves together with the mold 8 and comes off the insert nut 3 to be removed from the mold. At this time, the mold release is performed at the same time as the mold opening due to the deformation of the fixture 1 and the washer 6. At this time, as shown in FIG. 2, since the fixture 1 and the washer 6 are deformed, the mold opening can be easily performed without difficulty.

3 and 4 relate to another embodiment. The fixture 1 is the same as that of the above-mentioned embodiment, and is attached to the form 28 by the bracket 27, the sliding shaft 21, the toggle clamp 23 and the like. The bracket 27 is a so-called angle member and is welded and fixed to the outer surface of the form 28. The toggle clamp 23 is provided on the bracket 27. The toggle clamp 23 includes a V-shaped member 24 and a lever 2.
5 and the support piece 26. One end of the dog-legged member 24 is pin-joined to the rear end of the sliding shaft 21, the other end is pin-joined to one fulcrum of the lever 25, and the other fulcrum of the lever 25 is pin-joined to the support piece 26. The sliding shaft 21 slides in the cylindrical bearing 22 to slide in parallel with the upper surface of the bracket 27. The fixture 1 is attached to the tip of the sliding shaft 21 with bolts 20 through several washers.

As shown in FIG. 3, with the fixture 1 projected inwardly from the hole 29 of the form 28, the insert nut 3
Push in and fit. Concrete is put into the mold, and the mold is removed after curing. Lever 25 for demolding
By tilting in the direction of arrow B, as shown in FIG.
The sliding shaft 21 is moved outward, and the fixture 1 is pulled out from the insert nut 3.

In the case of this embodiment, it can be applied to any demolding method. For example, it is also possible to push up the concrete product upward without removing the formwork to remove the mold because the fixture is completely pulled out.

[0017]

INDUSTRIAL APPLICABILITY The present invention, in the installation work of the insert nut in the concrete product manufacturing line,
Since the insert nut has only to be fitted to the fixture protruding to the inner surface of the mold, it is extremely simple. Needless to say, tools such as an impact wrench are not required, and even a large mold can be handled by a single worker, and there is no need to risk working by digging under the mold. Further, the present invention can be applied not only to the case where the mold is removed straight at a right angle to the concrete surface and to remove the mold, but also to any case where it is removed by opening the mold or in the direction parallel to the concrete surface.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a structure of a mounting portion which is an embodiment of the present invention.

FIG. 2 is a view similar to FIG. 1 showing a demolded state.

FIG. 3 is a schematic cross-sectional view showing the structure of a mounting portion of another embodiment.

FIG. 4 is a view similar to FIG. 3 showing a demolded state.

FIG. 5 is a sectional view of an insert nut mounting portion of a conventional concrete formwork.

FIG. 6 is an explanatory diagram of a demolded state of FIG.

[Explanation of symbols]

 1 mounting tool 2 hole 3 insert nut 4 bolt 5 nut 6 washer 7 washer 8 formwork 9 backing plate 10 hole 11 hole 12 hinge 20 bolt 21 sliding shaft 22 bearing 23 toggle clamp 24 dog-shaped member 25 lever 26 support piece 27 Bracket 28 Formwork 29 Hole

Claims (6)

[Claims] 1. An insert nut fitting, which is made of an elastic material such as rubber or soft resin and is formed in a thin-walled cylindrical shape with an open end. 2. A concrete formwork, characterized in that a thin-walled cylindrical fixture having an open end made of an elastic body such as rubber or soft resin, into which an insert nut is fitted, is projected to the inner surface of the formwork. Structure of insert nut mounting part 3. The structure of the insert nut mounting portion of the concrete formwork according to claim 2, wherein holes are provided in the rear end of the fixture and the formwork, and bolts are inserted into the holes to attach the fixture to the formwork. 4. The structure of the insert nut mounting portion of the concrete formwork according to claim 3, wherein an elastic washer is interposed on the outer surface side of the formwork when mounting the fixture with bolts. 5. The structure of an insert nut mounting portion of a concrete formwork according to claim 2, wherein the fitting is attached to the formwork so as to be retractable outside the formwork. 6. The structure of the insert nut mounting portion of the concrete formwork according to claim 5, wherein the fixture is attached to the outside of the formwork by a toggle clamp attached to the outer surface of the formwork.