JPH0847916A - Anchor-holding fixture in forming of concrete product - Google Patents

Abstract

PURPOSE:To prevent strength from being injured owing to occurrence of rust of an anchor by facilitating a handling operation of an appliance holding the anchor when a concrete product is formed in order to bury the anchor into a hemispherical hollow so as not to be projected from a surface of the concrete product by forming the hemispherical hollow on the surface of the concrete product for civil engineering, construction, etc. CONSTITUTION:A threaded hole 2 is formed at a center of a circular plane of an almost semispherical synthetic resin-made holding fixture body 1. A permanent magnet 3 is arranged annularly around the threaded hole 2. Besides, a lip like rubber made annular body 6 for expanding the circular plane fits to an outer peripheral fringe of the circular plane of the holding fixture body 1. Further, a holding hole 10 wherein a head part 9 of an anchor 8 can fit movably to a center of a spherical surface of the holding fixture body 1 is so formed as to be interconnected concentrically to the threaded hole 2. An outer fringe part 15 of a notched ring like rubber made packing 11 to be inserted to be wound around a neck part 12 of the anchor 8 into the holding hole 10, is enlargingly tapered to outside from an inner peripheral surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for holding an anchor during molding of a concrete product so that the anchor can be embedded in a concrete product for civil engineering, construction, etc. without protruding from the surface.

[0002]

2. Description of the Related Art An anchor is embedded in a concrete product such as a concrete panel or a concrete earth retaining device so that the hook can be easily and surely engaged with the head of the anchor when the concrete product is lifted by a crane. Conventionally, it has been made easy to perform on-site work such as movement and installation of the concrete product. Then, by forming a hemispherical depression on the surface of the concrete product and projecting the head of the anchor into the depression, the anchor does not project on the surface of the concrete product and it is not necessary to cut the anchor later. This has also been done conventionally.

[0003]

By the way, as described above, an anchor holder that has been conventionally used at the time of molding a concrete product in order to form a hemispherical recess on the surface of the concrete product and project the anchor into the recess is described below. Since it was made of steel and was heavy, it was not easy to handle, and if it could be fixed to the inner surface of the form by a magnet, it would be dangerous because it could be dropped. .

An anchor embedded in a concrete product by using a conventional anchor holder has a hemispherical recess in which water accumulates and the base of the anchor is always exposed to a small amount of rainwater when left for a long time. Since it was easy to soak, it could rust and lose strength, leading to a serious accident due to breakage.

[0005]

An anchor holder for molding a concrete product according to the present invention is intended to solve the above-mentioned problems. A screw hole is formed at the center of a circular plane of a substantially hemispherical synthetic resin holder main body. A permanent magnet is annularly formed around the screw hole, and a lip-shaped rubber annular body for expanding the circular flat surface is externally fitted to the outer peripheral edge of the circular flat surface of the holder main body. A holding hole into which the head of the anchor can be loosely fitted is formed in the center of the spherical surface of the holder body so as to communicate with the screw hole concentrically, and is inserted into the holding hole so as to be wound around the neck of the anchor. It is characterized in that an outer edge portion of the notched ring-shaped rubber packing to be inserted has a shape in which it is expanded in a tapered shape from the inner peripheral surface toward the outside.

[0006]

The holder main body is made of synthetic resin and is lightweight, and the rubber ring body adheres to the inner surface of the frame like a suction cup to prevent concrete from entering. In addition, the rubber packing with the inner peripheral surface cut into a taper shape creates a hemispherical depression in the concrete product that covers the root of the anchor with concrete. Will no longer be in direct contact.

[0007]

An embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a substantially hemispherical holder body, and the holder body 1 is formed by press-forming a steel plate to form a screw hole 2 in a central portion thereof and a structure 5 in which an annular magnet case portion 4 is formed around the screw hole 2. Is formed by insert molding in a synthetic resin. The screw hole 2 is formed in the holder main body 1
A ring-shaped permanent magnet 3 made of ferrite is arranged at the center of the circular plane of the.

Reference numeral 6 denotes a rubber ring body fitted on the outer peripheral edge of the circular plane of the holder body 1. The rubber ring body 6 has an elastic lip-like portion 7 for expanding the circular plane outward. Are integrally formed.

A holding hole 10 into which the head 9 of the anchor 8 can be loosely fitted is formed in the center of the spherical surface of the holder body 1 so as to be concentric with the screw hole 2. Reference numeral 11 denotes a notched ring-shaped rubber packing wound around the neck portion 12 of the anchor 8 and inserted into the holding hole 10. The packing 1
Reference numeral 1 serves to hold the head portion 9 of the anchor 8 in the holding hole 10 and prevent concrete from entering the holding hole 10, and has a notch 13 formed therein. It can be wound around the neck 12 by expanding the notch 13 and easily pulled out from the holding hole 10 by engaging the outer periphery of the packing 11 with the step portion 14 formed on the inner peripheral surface of the holding hole 10. I try not to. In addition, the packing 11 is attached to the step portion 14.
When the packing 11 is engaged, the packing 11 elastically changes and the elastic restoring force presses the head 9 of the anchor 8 from the lower side, so that the anchor 8 can be held without rattling and vibration for concrete curing, etc. The anchor 8 will not be dropped even if a force is applied. The outer edge portion 15 of the packing 11 is formed in such a shape that it extends outward from the inner peripheral surface in a tapered shape.

When this anchor holder is used, first, the packing 11 is wound around the neck portion 12 of the anchor 8 so that the head portion 9 is loosely fitted in the holding hole 10 of the holder body 1 and the step portion 14 is formed. The anchor 8 is supported in the holding hole 10 by engaging the packing 11. Then, as shown in FIG. 2, the permanent magnet 3 is magnetically attached to the inner surface of the concrete formwork 16 made of an iron plate to support the anchor 8 in the concrete formwork 16, and the concrete 17 is poured.
At this time, since the lip-shaped portion 7 comes into close contact with the concrete form 16 due to the pressure of the concrete 17, it is difficult for the concrete to enter the magnetically adhered surface of the permanent magnet 3, so that the holder main body 1 is strongly attached to the inner surface of the concrete form 16. Supported by. After the concrete 17 is cured and hardened, the concrete form 16 is removed and the screw hole 2 is removed as shown in FIG.
The holder main body 1 is detached from the concrete 17 by screwing a bolt 18 onto the bolt 18 and pushing the head 9 with the tip of the bolt 18, and the packing 11 is removed from the anchor 8. As a result, as shown in FIG.
A hemispherical recess 19 is formed on the surface of 0, into which the head 9 of the anchor 8 can be projected. As shown in the figure, the base of the anchor 8 is the packing 11
The outer edge portion 15 of the above forms a form in which concrete is covered. Therefore, since the anchor 8 is not dipped in a small amount of rainwater 20, the anchor 8 will not be soaked in rainwater for a long time and rusted.

[0011]

As described above, according to the anchor holder of the present invention, by providing the rubber ring body, it is possible to prevent concrete from entering and to securely attach the permanent magnet to the concrete formwork. As a result, the retainer body is prevented from falling off, and the root of the anchor is always covered with concrete by the outer edge portion of the packing, so that the strength loss of the anchor due to the generation of rust can be prevented, which is a beneficial effect.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an anchor holder for molding a concrete product according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a usage state of the anchor holder.

FIG. 3 is an operation state diagram of FIG.

FIG. 4 is a vertical sectional view of a concrete product.

[Explanation of symbols]

 1 Holder Main Body 2 Screw Hole 3 Permanent Magnet 6 Rubber Ring 7 Lip Shaped Section 8 Anchor 9 Head 10 Holding Hole 11 Packing 12 Neck 13 Notch 14 Step 15 Outer Edge 16 Concrete Form 17 Concrete

Claims (1)

[Claims] 1. A substantially hemispherical synthetic resin holder body with a screw hole formed in the center of a circular plane, and a permanent magnet arranged annularly around the screw hole, and the holder body circular plane. A lip-shaped rubber ring body for expanding the circular plane is externally fitted to the outer peripheral edge of the holder, and a holding hole into which the head of the anchor can be loosely fitted is formed concentrically with the screw hole in the spherical center of the holder body. The outer edge of the notched ring-shaped rubber packing, which is formed so as to communicate with each other and is inserted into the holding hole so as to be wound around the neck portion of the anchor, expands outward from the inner peripheral surface in a taper shape. An anchor holder for forming a concrete product, which is characterized in that