JP2514471Y2 - Bolt fixing device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention inserts an anchor bolt into a pilot hole formed in a structure such as concrete or block material,
The present invention relates to a fixing device for fixing and fixing.

[0002]

2. Description of the Related Art A pre-drilled hole is made in a structure such as concrete or a block material, and an anchor bolt is inserted and fixed in this hole.
A hole anchor is generally known in which a driving pin is driven into an anchor bolt to push and open the tip end side of the bolt so that the push-opened portion on the tip end side of the bolt is pressed and fixed to the inner wall of the pilot hole.

[0003]

The conventional hole anchor has a drawback that the structure of the structure is destroyed when the pin is driven into the bolt inserted into the hole, and when the pin is accidentally driven, There is an inconvenience that it cannot be reused.

[0004]

In order to solve the above-mentioned problems, the present invention has a structure in which a structure such as concrete or a block material is provided with a pilot hole, and a plurality of facing surfaces are inclined in the pilot hole. The expansion means consisting of short tube fittings is loosely fitted to the bolt,
A bolt is inserted into the lower hole together with the expanding means, and by tightening the bolt, the short tubular metal fitting is pressed and fixed to the inner wall of the lower hole by the displacement of the action of the inclined surface of the short tubular metal fitting of the expanding means. A fixing device is provided.

[0005]

[Operation] A pilot hole 8 is formed at the bolt 3 setting position of the structure 7,
A bolt 3 provided with a means for expanding the short tubular metal fittings 1 and 2 is inserted into the pilot hole 8, a flange 4 provided on the short tubular metal fitting 2 is applied to the pilot hole opening, and a hook or the like is attached to the flange 4. When the bolt 3 is attached and the washer 5 is further applied onto the engaging member to tighten the bolt 3 with the nut 6 screwed to the bolt 3, the short tubular metal fitting 1 attached by welding the tip of the bolt 3 is pulled. The inclined surface 1a of the short tubular metal fitting 1 is displaced while sliding along the corresponding inclined surface 2a of the short tubular metal fitting 2, and due to this displacement action, both the short tubular metal fittings 1 and 2 are pressed against the inner wall of the pilot hole 8. It is fixed and becomes an anchor bolt.

Further, in order to release the fixing of the bolt 3, if the nut 6 is loosened, the interval between the short tubular metal fittings 1 and 2 is opened, and when the bolt 3 is exerted with a force in this opening, the expanding means is contracted. It is taken out in small quantities. Therefore, it can be reused. Further, there is no destruction of the structure of the structure during fixing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a bolt fixing device according to the present invention, which will be described below with reference to the drawings.

In the embodiment of FIGS. 1 to 3, reference numerals 1 and 2 are short metal fittings, and inclined surfaces 1a and 2a which are inclined are formed on the corresponding end surfaces facing each other, and the inclined surfaces 1a and 2a are formed. It is slidable along the surface, and the metal fittings are pressed to utilize the inclined surfaces 1a and 2a to cause a deviation and spread. That is, it is an expansion means. An end of a bolt 3 is fixedly provided in an end of one short tubular metal fitting 1, and a flange 4 is fixed to an end surface of the other short tubular metal fitting 2 and is loosely inserted in the bolt 3.
Further, a washer 5 is applied to the flange 4 and a nut 6 screwed to the bolt 3 is provided.

Reference numeral 7 denotes a structural body such as a block, in which a lower hole 8 is formed at a desired position for fixing the bolt 3 therein, and inside the lower hole 8, a means for expanding the short tube fittings 1 and 2 is provided. The bolt 3 is inserted into the opening of the pilot hole 8 so that the flange 4 provided on the short tube fitting 2 is in contact with the bolt 3, and the nut 6 screwed onto the bolt 3 is tightened to pull the short tube fitting 1. The corresponding inclined surfaces 1a and 2a are expanded along with the inclined surfaces 1a and 2a, and both short tubular metal fittings 1 and 2 are pressed against the inner wall of the hole 8 to fix the bolts 3.

FIG. 4 shows another embodiment, in which a nut 6a is welded to the side of the short tubular metal fitting 1 and a bolt 3 is screwed onto the nut 6a, and the short tubular metal fitting 1 is pulled and inclined by tightening by rotating the bolt 3. It is designed so that the surface causes a gap and spreads.

FIGS. 5 and 6 show another embodiment in which a third short-tube fitting 13 is added to the short-tube fittings 1 and 2 of the first embodiment. Is provided with inclined surfaces 13a and 13b at the ends corresponding to the corresponding short tube fittings 1 and 2, respectively, so that the tightening of the nut 6 causes a deviation.

[0012]

[Effects of the Invention] In the present invention, by tightening a nut screwed into a bolt, the corresponding inclined surfaces provided on the short tubular metal fitting cause the respective short tubular metal fittings to be displaced, and this displacement causes the inner wall of the pilot hole to come into pressure contact Since it is fixed, the bolt can be fixed and fixed by slightly tightening the nut, without destroying the tissue like the case of the structure like the conventional hole anchor,
Further, unlike the conventional hole anchor in which the pin is erroneously driven, the fastening is released by loosening the tightening of the nut so that the nut can be pulled out and reused.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a bolt fixing device according to an embodiment of the present invention, which is provided with a means for expanding a short tube fitting.

FIG. 2 is a side view of a partially cutaway state in which a bolt having the expanding means of FIG. 1 is inserted into a pilot hole formed in a structure and the expanding means is expanded and fixed to the pilot hole.

FIG. 3 is a perspective view of a short-tube fitting provided with a flange.

FIG. 4 is a vertical sectional side view of another embodiment of the bolt fixing device.

FIG. 5 is a vertical sectional side view of another embodiment of the bolt fixing device.

FIG. 6 is a vertical cross-sectional side view of a fixing state in which the bolt fixing device of FIG. 5 is fitted in the lower hole and is pressed into contact with the lower hole by the expanding means.

[Explanation of symbols]

 1,2,13 Short tube fittings 1a, 2a, 13a, 13b Inclined surface 3 Bolt 4 Flange 5 Washer 6,6a Nut 7 Structure 8 Pre-drilled hole

Claims (1)

(57) [Scope of utility model registration request] 1. A short hole is formed at a position where an anchor bolt is set in a structure, and a plurality of short tubular metal fittings, which serve as expanding means, are arranged by providing inclined surfaces on the end faces at corresponding positions facing each other. A position where the bolt is loosely fitted, and a flange is provided at the end of the short tubular metal fitting on one end side of the plurality of short tubular hardware, and the bolt provided with the short tubular hardware is in the pilot hole and the flange is in contact with the opening. The bolt fixing device is characterized in that the short tubular metal fitting is pressure-contacted and fixed to the inner wall of the prepared hole due to the displacement of the operation due to the inclined surface of the expanding means by inserting up to the bolt and tightening the bolt.