JPH0234352Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is used when constructing concrete foundations for houses, and is a receiving metal fitting that receives the ends of the main drawers and joists that make up the floor. This invention relates to a bolt embedding device for embedding bolts for fixing into concrete foundations.

(Conventional technology) Conventionally, bolts for fixing the ends of the main drawers and joists that make up the floor were used for temporary frames used to construct concrete foundations (hereinafter referred to as metal platforms).
It was attached to the concrete foundation by attaching it to the bolt insertion hole formed in the.

(Problem to be solved by the invention) A metal home with a bolt insertion hole formed therein becomes a special metal home for embedding bolts, and cannot be used for any other purpose. Bolt embedding positions are limited.

(Means for Solving the Problems) The device for embedding bolts in concrete foundations according to the present invention has a bolt insertion hole provided in the back plate of a box-like main body with an open front, and a periphery of the bolt insertion hole. is raised forward to form a short cylindrical body, and an inverted L-shaped hanging piece consisting of legs and a horizontal portion is attached to the front edge of the upper plate of the box-like main body at the tip of the horizontal portion. A box for embedding a bolt is erected facing forward, an embedding bolt is embedded in the side of the concrete foundation and has a male thread formed at one end of the bolt body, and a nut is screwed into the male thread. Become,
A short cylindrical body is provided protruding from the rear surface of the nut, and the outer diameter of the short cylindrical body is slightly smaller than the inner diameter of the short cylindrical body raised up from the periphery of the bolt insertion hole. be.

(Function) A bolt in which the embedded bolt is assembled by inserting the male thread of the embedded bolt into the bolt insertion hole formed in the back plate of the box-shaped body, and tightening the nut to the male thread protruding toward the front of the back plate. When the embedding box is attached to the inside surface of the metal home and the bolt embedding box is removed together with the metal home after the concrete has cured, the embedding bolt will be attached to the side of the concrete foundation with the male screw protruding horizontally. attached to the section.

(Example) Reference numeral 1 in the figure indicates a bolt embedding box,
Box-shaped main body 2 constituting the bolt embedding box 1
In this case, an upper side plate 5, a lower side plate 6, a left side plate 7, and a right side plate 8 are erected around a back plate 3, and the front side is open. . Two or more bolt insertion holes 10 are formed in the back plate 3, and a short cylindrical body 10a raised forward is formed at the peripheral edge of each bolt insertion hole 10. Inner peripheral surface of short cylinder 10a and bolt insertion hole 10
The inner circumferential surfaces of the two are flush with each other. Furthermore, an inverted L-shaped hooking piece 11 is provided upright on the front edge of the upper plate 5 . The latching piece 11 consists of a leg part 12 and a horizontal part 13 bent forward from the leg part 12 at a right angle. The legs 12 are erected parallel to the back plate 3.
Note that the locking pieces 11 may be provided with two or more locking pieces spaced apart from each other. An upper side plate 5, a lower side plate 6, a left side plate 7, and a right side plate 8 that constitute the periphery of the box-shaped main body 2
The back plate 3 is tilted so as to gradually contract backwards.
It is desirable that it be installed vertically. When the box-shaped main body 2 is formed in this manner, the bolt embedding box 1 can be easily demolded from the concrete foundation 16. Further, the open end surfaces of each of the side plates 5, 6, 7, and 8 are flush with each other, so that they can be brought into close contact with the inner surface of the metal home 15 formed of an iron plate.

Note that the shape of the box-like main body 2 is not limited to the rectangular shape as shown in the drawings, but may be circular, oval, triangular, or the like.

The embedded bolt 20 has a male thread 22 formed at one end of a bolt body 21 that is embedded in the concrete foundation 16, a flange 23 is formed between the bolt body and the male thread 22, and the bolt body 21 has a length of approximately L. It is bent into a U-shape or approximately U-shape.

The nut 25 has a female thread 26 that engages with the male thread 22 of the embedded bolt 20, and has a short cylindrical body 27 protruding from the rear surface of the nut 25. The inner diameter of the short cylindrical body 27 is formed to be slightly larger than the inner diameter of the female thread 26, and the outer diameter of the short cylindrical body 27 is formed to be slightly larger than the inner diameter of the female thread 26.
The inner diameter of the short cylindrical body 10a is slightly smaller than the inner diameter of the short cylindrical body 10a, which is formed upright on the peripheral edge of the cylindrical body 10a.

The reference numeral 30 in the figure is a magnet attached to the front side of the back plate 3. 31 is a screw that fixes the magnet 30 and the back plate 3. The front side surface 30a of the magnet 30 is substantially flush with the open end surface 2a of the box-shaped main body 2. It is preferable that the magnet 30 is housed in a case made of an iron plate or the like and attached to the back plate 3. Moreover, if the magnet 30 is made to be able to move slightly in the front and rear directions within the case, even if the inner surface of the metal home 15 is slightly uneven, or the front surface 30a of the magnet 30 and the box-shaped main body 2 are Even if there is some distortion in the flush state with the open end surface, it can be accommodated.

Next, a method of using the bolt embedding device configured as above will be explained.

As shown in FIG. 2, first the bolt body 21 is
The male screws 22 of the two embedded bolts 20 bent into a letter shape or the like are inserted into the bolt insertion holes 10 formed in the back plate 3 of the bolt embedding box 1 from the rear of the back plate 3. Male screw 22 protruding forward
Screw in the nut 25 and attach the embedded bolt 20 to the back plate 3.
Tighten and secure. At this time, the short cylindrical body 27 protruding from the rear surface of the nut 25 is fitted into the short cylindrical body 10a formed at the peripheral edge of the bolt insertion hole 10. As a result, the embedded bolt 20 is always held in the bolt embedding box 1 in a constant posture. Further, since the flange 23 formed on the embedded bolt 20 is tightly regulated by the rear surface of the back plate 3, the length of the male screw 22 protruding from the concrete foundation 16 can be made constant. Therefore, the embedded bolt 20 can be attached to the concrete foundation 16 with accurate dimensional accuracy, and the work of attaching the fixing fittings 18, etc., which will be described later, can be carried out smoothly.

Next, the required number of bolt embedding boxes 1 with the embedding bolts 20 attached in this way are placed in the assembled metal home 15 so that the open end of the box-like body 2 is on the inner surface of the metal home 15. Place the latching piece 11 on the metal home 1 so that it is in tight contact with the metal home 1.
Hang it on the upper end of 5. After this, concrete is poured into the metal home 15 and a concrete foundation 16 is constructed. After the concrete hardens,
First, dismantle Metal Home 15, and finally Natsuto 2.
5 and remove the bolt embedding box 1 from the concrete foundation 16. This completes the work of embedding the embedding bolts 20 into the side of the concrete foundation 16. Incidentally, the embedded bolt 20 is used to connect the joist hook 17 to the concrete foundation 1, for example, as shown in FIG.
It is used for attaching a fixing metal fitting 18 for fixing to 6.

(Effect of the invention) The male threads of the embedded bolts are inserted from the rear of the back plate into the bolt insertion holes formed in the back plate, and the embedded bolts are fixed by screwing nuts into the male screws that protrude toward the front of the back plate. At this time, the short cylindrical body protruding from the rear surface of the nut is inserted into the short cylindrical body formed at the front peripheral edge of the bolt insertion hole. As a result, the axis of the embedded bolt and the axis of the bolt insertion hole are aligned, and the embedded bolt is accurately installed at the desired dimensional position. Therefore, the installation work of the fixing fittings for fixing the joists can be carried out smoothly. In addition, the bolt embedding device can be easily attached to the inner surface of the metal home using a magnet. Therefore, the bolt embedding device can be installed at any position along the length of the metal home.

[Brief explanation of drawings]

The drawings show an embodiment of the bolt embedding device in a concrete foundation according to the present invention; Fig. 1 is an exploded perspective view, Fig. 2 is a longitudinal sectional view of the device in use, and Fig. 3 is an example of the use of the embedding bolt. FIG. 1... Box for bolt embedding, 2... Box-shaped main body, 3... Back plate, 10... Bolt insertion hole, 10a
...Short cylindrical body, 11...Latching piece, 12...Legs, 1
3...Horizontal part, 15...Metal home, 16...
Concrete foundation, 20...Embedded bolt, 21...
... Bolt body, 22 ... Male thread, 23 ... Flange, 25 ... Nut, 26 ... Female thread, 27 ...
Short cylinder, 30... magnet.

Claims (1)

[Claims for Utility Model Registration] 1. A bolt insertion hole is provided in the back plate of a box-like main body with an open front, and the peripheral edge of the bolt insertion hole is raised forward to form a short cylindrical body, and a bolt embedding box, in which an inverted L-shaped hanging piece consisting of a leg part and a horizontal part is erected on the front edge of the upper plate of the box-shaped main body with the tip of the horizontal part facing forward. , consisting of an embedded bolt with a male thread formed at one end of the bolt body embedded in the side of the concrete foundation, and a nut screwed into the male thread, and a short cylindrical body protruding from the rear surface of the nut, A device for embedding bolts into a concrete foundation, characterized in that the outer diameter of the short cylinder is slightly smaller than the inner diameter of the short cylinder raised up from the periphery of the bolt insertion hole. 2. The device for embedding bolts into a concrete foundation as set forth in claim 1 of the utility model registration claim, in which a magnet is attached to the front side of the back plate, and the front side of the magnet and the open end surface of the box-shaped body are substantially flush with each other. .