JP2648741B2 - Structure of insert nut mounting fixture and insert nut mounting part of concrete formwork - Google Patents

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 device for mounting an insert nut on a concrete form for embedding the insert nut in a concrete product, and to 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 lifting concrete products and connecting concrete products. Such an insert nut is embedded by pouring concrete into a mold and hardening the insert nut in a state where the insert nut is mounted on the inner surface of the mold in advance.

FIGS. 8 and 9 are explanatory views showing the structure of a nut embedding portion of a conventional concrete formwork. Form holes 22 are opened in the form 20 at positions where the insert nuts 21 are to be embedded. As shown in FIG. 5, bolts 23 are passed through the form holes 22 from outside and the insert nuts 21 are screwed from inside. And fix it. After the concrete is poured and hardened, the bolts 23 are removed with an impact wrench or the like, and the mold is removed as shown in FIG.

[0004]

The structure of the insert nut embedding portion of the conventional concrete form has the following disadvantages. The work of screwing the bolt in fixing the insert nut and the work of removing the bolt with an impact wrench or the like in removing the mold are complicated and the work efficiency is poor. When the formwork is large, fixing the insert nut requires two workers, a person screwing a bolt outside the formwork and a person holding down the insertnut inside the formwork. When fixing the insert nut with bolts from the lower side of the formwork, it is dangerous because an operator has to dig into the lower side of the formwork. The present invention solves such a problem,
An object of the present invention is to provide a structure of an insert nut embedding portion of a concrete product which is simple and less dangerous.

[0005]

According to the present invention, a bolt head is integrally inserted into a base end portion of a cylindrical plastic boss having an open end by insert molding, and a bolt foot portion is projected rearward. 2. The bolt foot of the insert nut mounting tool according to claim 1, wherein the outer diameter of the boss is substantially equal to the thread diameter of the insert nut screw through the insert nut mounting tool and the bolt hole provided in the formwork. And a boss protruding from an inner surface of the formwork, which is fixedly fastened with a nut from the backside of the formwork.

[0006]

According to the present invention, the insert nut is attached to the formwork in the concrete production line by attaching the plastic boss to the formwork by projecting the boss from the inner surface of the formwork. This can be easily performed by pressing the boss projecting from the inner surface of the mold so as to fit the boss. Since the boss is made of plastic and has a thin cylindrical shape with an open end, its elasticity makes it easy to insert the insert nut and does not damage the screw thread. Also, the insert nut is unlikely to come off even when the concrete is poured or compacted by a vibrator, and there is little concrete leakage into the insert nut.

A bolt head is integrally embedded in the base end of the plastic boss by insert molding. Insert molding is a method in which a bolt head is set in a mold for molding a boss and a plastic material is injected into the boss, and is a molding method in which the bolt head is embedded when the boss is molded. Since the boss and the bolt are strongly integrated, they have the strength to withstand continuous use. Further, the bolt head embedded in the boss prevents the plastic from being deformed due to the heat of hardening of the concrete and causing permanent deformation, thereby further improving the durability of the boss.

At the time of demolding, only the mold is separated from the concrete surface, the fixture is separated with the mold, and only the insert nut remains and is embedded in the concrete.

In particular, as shown in FIG. 5, even when the mold is opened with the hinge at the center, and the mold is removed, the boss is firmly integrated with the bolt at the base end but is elastically deformed toward the tip. Since the configuration is easy to perform, it is also possible to remove the fixture without removing the fixture from the mold.

According to the third and fourth aspects of the present invention, the use of the pedestal allows the existing formwork already provided with holes (the existing formwork to have an insert nut as shown in FIGS. 8 and 9). (A hole having a diameter slightly larger than the diameter is already provided.).
In addition, when the pedestal is used, as shown in FIG. 2 or FIG. 3, the introduction portion of the insert nut is supported by the pedestal, and the inner thread portion is supported by the boss, so that the two points are supported. The insert nut is harder to come off even by impact. In the case of the same figure, since there is no screw in the introduction part of the insert, it is possible to completely prevent concrete from entering into the insert nut by fitting with the pedestal. Also, when press-fitting the insert nut into the boss and pedestal protruding from the inner surface of the formwork, if the boss is fitted to the screw portion of the insert nut, the insert nut will not fall even if you release your hand, The press-fitting operation is simple because the core matches the core of the pedestal.

[0011] The step portion is divided into a large diameter portion and a small diameter portion. The large diameter portion is substantially equal to the inner diameter of the insert nut introduction portion, and the small diameter portion is substantially equal to the thread diameter of the screw of the insert nut. It is convenient to mount the insert nut fitting of the present invention in a large hole of the present invention. That is, when the pedestal is mounted with its small-diameter portion facing rearward, that is, facing right in FIG. 3, the small-diameter portion 4b having a diameter substantially equal to the thread diameter of the screw of the insert nut is fitted into the bolt hole 12 of the formwork. Therefore, the center of the bolt hole 12 of the mold and the center of the bolt hole 4c of the pedestal 4 coincide with each other, and the insert nut can be accurately mounted at a predetermined position.

When mounting the insert nut mounting tool of the present invention in a small hole of a new formwork, it can be handled by mounting the insert with the pedestal reversed as shown in FIG. In the case of FIG. 3, since the small diameter portion of the pedestal enters the hole of the mold, the amount of protrusion of the boss from the mold is made equal to that of FIG. ing.

According to the present invention, by adopting the above configuration,
In the existing mold and the new mold, the insert nut fixture, the pedestal, and the insert nut are common members, and both can be handled only by the difference between the orientation of the pedestal and the presence or absence of the adjustment ring.

When the insert fixture is attached to the mold with a nut, if a washer made of an elastic material such as a soft resin is interposed on the back of the mold, the elasticity of the washer causes the fixture to some extent relative to the mold. As shown in FIG. 5, even when the mold is opened with the hinge at the center and the mold is removed, the fixture is removed from the mold in combination with the elasticity of the fixture itself. It can be easily removed without a mold.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 is a partially cutaway side view of an insert nut mounting tool 1 according to one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing a structure of an insert nut attaching portion of a concrete formwork according to one embodiment of the present invention, FIG. 3 is a sectional view showing a structure of an insert nut attaching portion of another embodiment, and FIG. , FIG. 5 is an explanatory view when the mold is removed, FIG. 6 is a sectional view of the insert nut, and FIG. 7 is a perspective view of the vibration isolating cover 7.

The fixture 1 is an embodiment of the present invention and comprises a boss 2 and a bolt 3 made of nylon resin. The boss 2 has a cylindrical shape with an opening 2a formed at the tip, the head of the bolt 3 is integrally embedded in the base end 2b by insert molding, and the foot of the bolt 3 projects rearward. . The fixture 1 is attached to the mold with a bolt foot portion inserted into a bolt hole provided in the mold, fastened and fixed with a nut from the back of the mold, and a boss protruding from the inner surface of the mold. The insert nut is attached to a boss protruding from the inner surface of the mold by fitting its mouth portion. The outer periphery of the boss 2 of the attachment 1 is slightly tapered near the tip, and the tip is slightly smaller than the thread diameter (inner thread method) of the insert nut to be used, and serves as an inlet for the diameter. In addition, from the vicinity of the center to the vicinity of the rear end, the diameter of the insert nut is slightly larger than the inner diameter of the insert nut, so that the screw of the insert nut can bite and can be firmly fitted.

The fixture 1 is used by being mounted on a mold as shown in FIGS. 2 and 3, for example. First, FIG. 2 will be described. A bolt hole 11 having a diameter slightly larger than the diameter of the bolt 3 is formed in the mold 10. A pedestal 4 is inserted through the bolt 3 of the fixture 1. The pedestal 4 is made of nylon resin mixed with glass fiber, has a disk shape having a bolt hole 4c in the center, and is divided into a large-diameter portion 4a and a small-diameter portion 4b at a step portion. The small diameter portion 4b is substantially equal to the inside diameter of the
The small diameter portion 4b is attached in a state in which the small diameter portion 4b faces the front, that is, the left side in FIG. The bolt 3 of the fixture 1 is inserted into the bolt hole 11 of the mold 10,
It is tightened and fixed with nuts 5 on the back of the formwork. An anti-vibration cover 7 and a vibration absorbing plate 8 are arranged between the nut 5 and the mold 10. As shown in FIG. 7, the anti-vibration cover 7 is made of plastic and shaped like a spider's foot. The vibration absorbing disk 8 is a disk made of an elastomer. The vibration-proof cover 7 and the vibration-absorbing plate 8 both function as elastic body washers.
As shown in FIG. 5, when opening the mold and removing the mold,
Due to these deformations, the fixture 1 is relatively displaced with respect to the mold, facilitating removal. These also have the effect of not transmitting the vibration of the vibrator for compacting the concrete to the bolt 3. On the inner surface of the formwork 10,
The boss 2 and the pedestal 4 project.

In the case of the embodiment shown in FIG. 2, a hole through which the bolt 3 passes may be formed in the formwork 10. Therefore, as is apparent from FIG. It is sufficient to open it, which is advantageous in the strength of the mold.

FIG. 5 shows a case where the mold 10 shown in FIG. In the case of this embodiment, not only the boss 2 but also the anti-vibration cover 7 and the vibration-absorbing plate 8 on the back of the mold are deformed at the time of demolding, so that the distance between the hinge 16 and the insert nut mounting portion is very poor, less than 10 cm. It is possible to remove the mold as it is under the conditions.

FIG. 3 shows an existing bolt hole 1 in a formwork.
No. 2 is perforated. As shown in FIGS. 8 and 9, a bolt hole having a diameter slightly larger than the diameter of the insert nut is already formed in the mold used conventionally.
In this case, as shown in FIG. 3, the pedestal 4 is reversed from that in FIG. 2, and the small diameter portion 4b is attached rearward, that is, in a state facing the right side in FIG. Then, the small-diameter portion 4b having a diameter substantially equal to the thread diameter of the screw of the insert nut is fitted into the bolt hole 12 of the mold, and the center of the bolt hole 12 of the mold coincides with the center of the bolt hole 4c of the pedestal 4. Can be mounted exactly in place. Between the boss 2 and the pedestal 4, an adjustment ring 6 for adjusting the amount of protrusion from the mold surface is arranged. The adjusting ring 6 has a bolt hole 6a in the center and has a disk shape having substantially the same diameter as the base end of the boss 2, and is made of a nylon resin mixed with glass fibers.

The insert nut 13 to be attached is shown in FIG.
As shown in the figure, the opening has a screw 15 formed therein, and the opening is the screw-free introduction portion 14.

In order to attach the insert nut 13 to the mold, the insert nut 13 is held by hand and pressed into a boss protruding from the inner surface of the mold. Then, as shown in FIG.
The outer periphery of the boss 2 comes into contact with the screw 15 of the insert nut, and the insert does not drop even if the hand is released, and the core of the insert nut matches the core of the pedestal. Further, the insert nut is press-fitted until it completely fits into the large-diameter portion of the pedestal, resulting in the state of FIG. 2 or FIG.

In the embodiment shown in FIGS. 2 and 3, the insert nut is held by the boss 2 and the pedestal 4 so that the insert nut is strong against vibration of the vibrator and does not fall out. In addition, since the large diameter portion 4a of the pedestal 4 and the introduction portion 14 of the insert nut 13 are fitted, this portion serves as a seal, which can completely prevent the concrete toro from entering the insert nut. .

The material of the boss is not limited to the nylon resin of the embodiment, but may be any plastic having appropriate strength and elasticity. The material of the pedestal and the adjusting ring is not limited to the embodiment, but may be made of steel. However, if the pedestal is made of plastic, the press-fitting of the insert nut is easier than that of steel.

[0025]

The present invention relates to a method for mounting an insert nut in a concrete product manufacturing line,
Since the insert nut may be fitted to the boss protruding from the inner surface of the mold, it is very simple. Of course, tools such as mounting bolts and impact wrenches are not required, and even a large formwork requires only one worker, and there is no need to take the danger of working under the formwork. Since the bolt head is embedded at the base end of the boss by insert molding, the boss and the bolt are strongly integrated, providing strength that can withstand continuous use and durability that does not cause permanent distortion due to concrete curing heat. Have. In addition, the present invention can be applied not only to the case where the mold is directly removed at right angles to the concrete surface and the mold is removed, but also to the method of removing the mold by opening the mold. When the mold is opened and the mold is removed, the boss is deformed, but since the bolt head is integrally embedded, the boss has excellent durability against deformation and can withstand repeated use. When the pedestal is used, the insert nut can be firmly attached with two points of support, and the penetration of concrete toro into the insert nut can be completely prevented. When used for a new mold, a small hole may be formed in the mold, so that the strength of the mold is not reduced. It can be installed in the large hole of the existing formwork, and most of the components are common between the new formwork and the existing formwork.

[Brief description of the drawings]

FIG. 1 shows an insert fixture 1 according to one embodiment of the present invention.
It is a partial notch side view.

FIG. 2 is a cross-sectional view showing a structure of an insert nut mounting portion of a concrete formwork according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a structure of an insert nut mounting portion according to another embodiment.

FIG. 4 is an explanatory view when an insert nut is attached.

FIG. 5 is an explanatory view at the time of demolding.

FIG. 6 is a sectional view of an insert nut.

7 is a perspective view of an anti-vibration cover 7. FIG.

FIG. 8 is a cross-sectional view of an insert nut mounting portion of a conventional concrete formwork.

FIG. 9 is an explanatory diagram of a detached state of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert nut fixture 2 Boss 3 Bolt 4 Pedestal 5 Nut 6 Adjustment ring 7 Vibration-proof cover 8 Vibration absorber 10 Formwork 11 Bolt hole 12 Bolt hole 13 Insert nut 14 Introducing part 15 Screw 16 Hinge

Claims (5)

(57) [Claims] 1. An insert nut mounting tool wherein a bolt head is integrally embedded in a base end of a cylindrical plastic boss having an open end by insert molding, and a bolt foot is projected rearward. 2. The bolt nut of the insert nut mounting tool according to claim 1, wherein the outer diameter of the boss is substantially equal to the thread diameter of the insert nut through a bolt hole provided in the mold. The structure of the insert nut mounting part of the mold, characterized in that the boss protrudes from the inner surface of the form 3. A disc-shaped step having a bolt hole in the center of a bolt foot projecting rearward from the insert nut mounting tool according to claim 1, wherein an outer diameter of the boss is substantially equal to a thread diameter of a screw of the insert nut. The large diameter portion is divided into a large diameter portion and a small diameter portion, and the large diameter portion is approximately equal to the inner diameter of the insert nut introduction portion, and the small diameter portion is approximately equal to the thread diameter of the screw of the insert nut, and inserted with the small diameter portion facing forward, Further, the bolt foot portion is inserted into a bolt hole provided in the formwork, tightened and fixed with a nut from the backside of the formwork, and a pedestal and a boss are protruded from the inner surface of the formwork. Division structure 4. A disk-shaped insert nut having a bolt hole in the center of a bolt foot portion projecting rearward from the insert nut fitting according to claim 1, wherein an outer diameter of the boss is substantially equal to a thread diameter of a screw of the insert nut. An adjustment ring having an outer diameter that can enter the diaper and a thickness approximately the same as that of the small diameter portion of the pedestal, and a disk-like shape with a bolt hole in the center, and the step portion is divided into a large diameter portion and a small diameter portion. The small diameter part is almost equal to the inside diameter of the introduction part, and the small diameter part is almost equal to the thread diameter of the insert nut.
Furthermore, insert the bolt foot and the pedestal small diameter part into the bolt holes provided in the formwork, tighten and fix with nuts from the back of the formwork,
The structure of the insert nut mounting part of the concrete formwork, characterized in that the pedestal large diameter part, the adjustment ring and the boss protrude from the inside of the formwork 5. The structure of the insert nut mounting part according to claim 2, wherein an elastic washer is interposed between the nut on the back of the form and the form.