JP3079309B2 - How to install inserts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing an insert.

[0002]

2. Description of the Related Art A fixture called an insert is used when other parts or members are installed on a structure such as a concrete structure that cannot be welded. This is generally done by embedding a nut-shaped part in the concrete surface when casting concrete. After the mold is disassembled, the end face of the nut is exposed on the concrete surface, so a bolt is screwed into the nut and used.

[0003]

SUMMARY OF THE INVENTION The following problems exist in the method of installing the insert as described above. <A> Since the conventional insert is made of metal, there is a possibility that it will be corroded by long-term use. Then, there is a risk that members (piping, signboard, etc.) attached via bolts may fall off. <B> Ceramic inserts have been manufactured to cope with such corrosion. A ceramic insert has advantages such as being not corroded and being hardly damaged in a fire. However, ceramics have a low resistance to tensile force as compared with metal, and on the other hand, a large tensile force acts on the insert from the attached bolt, so that there was a problem in practical use.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to provide an insert which has extremely high durability, can sufficiently withstand tensile force, and can withstand practical use. The aim is to provide a method.

[0005]

In order to achieve the above-mentioned object, an insert of the present invention is a cylindrical body entirely formed of ceramics, and has a threaded hole through which a bolt is screwed. There are at least three equal-diameter portions having the same diameter on the outer circumference. In the middle of the same-diameter portion, the diameter gradually decreases from the diameter of the same-diameter portion and then expands again to have the same diameter. Formed a plurality of squeezed parts that reach the same diameter as the part, and further formed a notch in a part of the same diameter part,
Using an insert, this insert inside the formwork ,
Forming side diameter is larger than insert side diameter
The present invention is characterized by a method of installing an insert, which is performed by placing concrete through a certain cylinder and placing it.

[0006]

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

[0007]

[Shape of Insert] First, the shape of the insert 1 used in the installation method of the present invention will be described.

<A> Overall shape. The insert 1 used in the installation method of the present invention has a cylindrical shape as a whole, and is entirely formed of ceramics. Inside the cylinder, a screw hole 11 for screwing a bolt is penetrated in parallel with the central axis of the cylinder. The range in which the screw is engraved may be the entire range or a part.

<B> The same diameter portion and the throttle portion. The outer periphery has two identical diameter portions 12 having the same diameter.
In the middle of the same-diameter portion 12, there is formed a narrowed portion 13 whose diameter gradually decreases from the diameter of the same-diameter portion 12, expands again, and reaches the same diameter as the same-diameter portion 12. Therefore, it is formed in a so-called drum shape. Although the above description has been given of the case where the same-diameter portion 12 is formed in two places,
2 need not be two places, but can be arranged at three places or more as shown in FIG.

<C> Non-circular portion. Further, a cutout surface 14 is formed in a part of the same diameter portion 12. As a result, a non-circular portion, which is not perfectly circular in cross section, is formed in the same diameter portion 12. The purpose of this is to avoid the possibility of rotation if the whole is completely symmetrical about the central axis, thereby avoiding it.

[0011]

[Installation Method] Next, a case where the insert having the above-described configuration is installed in a concrete structure will be described.

<A> Mounting on a mold. Before placing the concrete, the insert is fixed inside the formwork 5. For this purpose, the fixing bolt 3 is screwed into the screw hole of the insert, and the fixing bolt 3 is attached to the formwork 5 using the wing nut 31 or the like. Insert 1
In the case where the front surface of the insert is not exposed directly to the concrete surface but is installed inside the concrete, the cylinder 32 is interposed between the inner surface of the formwork 5 and the front surface of the insert 1 as shown in FIG. If a taper is formed in the cylinder 32 so as to spread outward and a flange plate is attached to the outer end, removal is easy even after the concrete is hardened. When exposing the end face of the insert 1 to the concrete surface, the cylinder 3
2 is unnecessary.

<B> With anchor bolt. As shown in FIG. 5, a configuration in which an anchor bolt 4 is attached to the rear of the insert 1 can be adopted. In that case, the fixing bolt 3 is screwed into the screw hole 11 of the insert 1 from the mold frame 5 side, and the anchor bolt 4 is screwed from the opposite side and fixed.

<C> Casting concrete. After attaching the insert 1 inside the formwork 5 in this way,
Pour concrete. When the concrete hardens, the fixing bolt 3 is rotated and removed. When the cylinder 32 is installed, it is pulled out after the mold 5 is disassembled. This insert 1
For example, a hook is screwed into the screw hole 11 from the outside, and piping, wiring, and the like are attached to the hook for use.

[0015]

[Effect of the present invention] Since the method of installing the insert of the present invention is as described above, the following effects can be obtained. <A> Since the insert 1 used in the installation method of the present invention is made of ceramics, it does not corrode even when used for a long time. Therefore, if a mounting bracket such as a hook screwed into the insert 1 is corroded, it can be used in a permanently safe state if only the bracket is removed and replaced with a new bracket. <B> The diameter of the insert 1 is gradually reduced from the diameter of the same-diameter portion 12 to the middle of a plurality of the same-diameter portions 12 having the same diameter, and then expanded again to have the same diameter as the same-diameter portion 12. This is a shape in which the narrowed portion 13 is formed. That is, it is formed in a so-called drum shape. Therefore, insert 1
When a metal piece such as a hook is attached to the insert 1, most of the load acts as a compressive force on the insert 1. For this reason, even ceramics that are weak in tensile force can sufficiently withstand practical use. <C> In the insert 1, a narrowed portion 13 whose diameter gradually increases is formed in the middle of the same-diameter portion 12. In this gradually expanding portion, the compressive force can be dispersed and smoothly transmitted to the outer portion having the same diameter, so that the compressive force does not concentrate and the risk of breakage can be avoided. <D> Since it is a ceramic insert, it has good electrical insulation and high resistance to electrolytic corrosion. Further, if cement is used as the filler, the reliability can be maintained for a long time without being damaged by fire.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of an insert used in the installation method of the present invention.

FIG. 2 is a perspective view thereof.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is an explanatory view of a state of attachment to a mold.

FIG. 5 is an explanatory view of another mounting state.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shojiro Masuo 1-111-27 Yoshioka Higashi, Ayase-shi, Kanagawa Prefecture (72) Inventor Kimio Momose 532 Hiratsuka-shi, Kanagawa Prefecture Public Institution (72) Inventor Hiroshi Kimura Sagamihara-shi, Kanagawa Prefecture 2-17-16 Soinan (56) References JP-A-8-177129 (JP, A) Japanese Utility Model Application No. Sho 62-49506 (JP, U) Japanese Utility Model Application No. Sho 49-64558 (JP, U) Japanese Utility Model Utility Model Sho 58- 151206 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/41 502 E04G 9/10

Claims (2)

(57) [Claims] 1. A cylindrical body entirely formed of ceramic, having a threaded hole through which a bolt is screwed, and having at least three equal-diameter portions having the same diameter on the outer periphery.
Formed above, this is the middle of the diameter portion, multiple leading to the same diameter as the diameter portion gradually expanding again reduced in diameter from the diameter of the diameter portion
A method of installing inserts in which a number of squeezed portions are formed, and a part of the same diameter portion is formed with a cut-out insert, and this insert is mounted inside the formwork and cast into concrete. 2. A cylindrical body entirely formed of ceramics, which has a threaded hole through which a bolt is screwed, and an outer periphery having at least three equal-diameter portions having the same diameter.
Formed above, this is the middle of the diameter portion, multiple leading to the same diameter as the diameter portion gradually expanding again reduced in diameter from the diameter of the diameter portion
Forming a diaphragm portion of the number of further uses an insert to form a notch in part of the same diameter portion, the insert inside the mold, the diameter of the mold side Insa
A method of installing an insert, which is performed by mounting concrete through a cylinder formed larger than the diameter of the insert side.