JP2000320098A - Legged support reinforcement for post-fitting of support in concrete.structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide legged support reinforcement for post-fitting of a support in a concrete structure which can be fixed, with the length of a screw bolt as the leg adjusted arbitrarily in conformity with the depth of a hole of the structure, and of which the screw bolt can be made to be of a small diameter. SOLUTION: In legged tubular support reinforcement P which is fixed by casting of hardening resin with the leg put in a hole bored in a concrete structure, a tubular long nut 3 is fitted in the lower end part of the support reinforcement P and fixed and a screw bolt with a short piece nut 7 is screwed therein as the leg. Even when the hole 13 bored in the structure for insertion of the screw bolt 5 as the leg is shallow due to the hindrance of a reinforcing bar, the legged support reinforcement P can meet the hole easily, since it can be fixed with the length of the leg adjusted arbitrarily. Besides, the operability is very excellent, since the hole 13 can be made such a small bored hole as simplifies execution of work, while allowing the screw bolt 5 to be held therein. Moreover, the important part of a support 1 can be reinforced rationally to prevent it from being broken, and the strength of the structure can be maintained by the reinforcing bar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to post-installation of a pillar in a concrete structure used as a core material of a pillar when a pillar such as a handrail is erected on a structure such as a concrete parapet (hereinafter simply referred to as a structure). For reinforced pillars with feet.

[0002]

2. Description of the Related Art To erect a support such as a handrail on a structure,
When concrete is poured, a recess for dropping a support is formed, and an anchor for the support is sometimes buried. On the other hand, in the case of a structure that has already been completed, a hole for erecting a pillar is drilled in the structure, but a reinforcing bar of the structure may be an obstacle to drilling.

[0003] In addition, since bending stress tends to concentrate on an upright column, particularly at the lower end thereof, to prevent breakage,
Pillar reinforcement is inserted into the pillar as a core material. Even in such a case, if the pillar or the lower end of the pillar reinforcement is inserted directly into the hole drilled in the structure, the hole becomes extremely large, requiring a lot of labor for drilling work. The hole was made small by inserting a screw bolt which is safe and fitted as a foot, and inserting the screw bolt into the hole.

Conventionally, in such a column support with feet, in order to fix a screw bolt as a foot, a split groove is formed on both sides of the column reinforcement, and the split groove is welded to the screw bolt.
Since it was immobilized and integrated, if there was a rebar failure in the drilling as described above, either the screw bolt was cut off to adjust the length, or the rebar was cut to remove the failure. Even so, it is a difficult task, especially,
Rebar cutting has the problem of impairing the strength of the structure.

[0005] In addition, since the means for welding the column reinforcement is used for mounting the screw bolt as described above, the diameter is substantially the same as the inner diameter of the column reinforcement, and in this regard, there is a restriction that the diameter of the screw bolt is reduced. .

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention can freely adjust and fix the length of a screw bolt as a foot according to the depth of a hole in a structure, It is another object of the present invention to provide a post-supported column support for retrofitting a column in a concrete structure in which a screw bolt can have a small diameter.

[0007]

In order to achieve the above object, the present invention provides a method for forming a hole in a concrete structure,
In the column-shaped column support with feet that is inserted into the hole and fixed by injecting the curable resin, a cylinder long nut is fitted and fixed to the lower end of the column reinforcement, and a screw bolt with a short piece nut is used as the foot. It is intended to provide footed column reinforcement for retrofitting columns in threaded concrete structures.

[0008] According to the above configuration, the diameter of the hole in which the pillar is to be erected is large enough to accommodate the screw bolt and the short nut. Alternatively, if the short piece nut is used as a flange to be hooked on the upper surface of the hole, the diameter becomes small enough to insert only the screw bolt. In any case, to adjust the foot length to the depth of the hole, with the short nut loosened, turn the screw bolt to advance and retreat to an appropriate length while tightening the short nut to the cylinder long nut Fix the screw bolt with.

[0009] The diameter of the screw bolt is not the inner diameter of the column reinforcement but a small diameter that is screwed into a cylindrical long nut fitted therein. Further, since the column reinforcement is reinforced by the cylindrical nut, it can rationally cope with bending stress concentrated on the lower end of the column.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the cylindrical shape of the column reinforcement 1 is not limited to a cylindrical shape, but may be a square cylindrical shape such as a square. And if it is the cylinder long nut 3 of the shape matched with the internal shape, it can be firmly fixed by welding (claim 2).

The short nut 7 means a short piece with respect to the foot length of the screw bolt 5, so that the screw of the screw bolt 5 can be used for coupling with the hardening resin 16. Therefore, if the use of this connection is effective, it may be longer than a normal nut. Conversely, as described above, there is a case where it is formed to be thin like a flange.

[0012]

As described above, according to the present invention, it is possible to freely adjust and fix the foot length of the support with a foot, so that a hole for inserting a screw bolt as a foot in a structure is formed. In addition, even if the hole becomes shallow due to rebar failure, it can easily cope with the hole, and the hole can be a small drilling hole that can be easily installed so that the screw bolt can be accommodated. In addition, there is an excellent effect that the column can be reinforced rationally at a key point so that the column is not broken, and the strength of the structure can be maintained by the reinforcing bar.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a column reinforcement P is a cylindrical shape into which a column 1 is inserted, and a cylindrical nut 3 is fitted to a lower end portion thereof. A screw bolt 5 as a foot is screwed in, and a short nut 7 is screwed to the screw bolt 5.

For mounting the cylindrical nut 3, split grooves 9, 9 are provided on opposite side surfaces of the lower end of the column reinforcement 1,
The tube-length nut 3 is tightened by drawing work by caulking the lower end, and furthermore, welding 11 is performed in the split groove 9 to completely fix the both.

In order to adjust the foot length of the screw bolt 5, the screw bolt 5 is rotated to a predetermined length, and then the short nut 7 is rotated and the screw bolt 5 is fixed by a double nut which is tightened to the cylinder long nut 3. I do. It is desirable that this foot length be set to a standard and used for use.

In order to install a handrail on a parapet 10 such as a veranda, a hole 13 is formed in the parapet 10, and when the hole 13 is restricted in depth by an obstacle of the reinforcing bar 15, the short nut 7 is attached. The foot length is adjusted to the depth of the hole 13 by loosening the screw bolt 5 once. Then, the screw bolt 5 is inserted into the hole 13 together with the injection of the curable resin 16 by the injector 17. Reference numeral 18 denotes a hole concealer, which is lowered onto the parapet 10 after the column 1 is inserted into the column reinforcement P.

FIG. 3 and FIG. 4 show another embodiment. In this case, by using a cylindrical nut having a thickness inscribed in the column reinforcement P, the column reinforcement N is added. The tightening process was omitted, and the cylindrical nut 3 was fixed only by welding 11. In addition, the diameter of the hole 13 could be reduced by cutting the lower end portion 20 of the cylindrical nut 3 to make it thinner. Since a hexagonal nut was used as the cylinder-length nut 3, it could be made thin by cutting the corner 21 only.

[Brief description of the drawings]

FIG. 1 is a perspective view showing reinforcement of a pillar with a foot according to the present invention in a manner in which a pillar is erected.

FIG. 2 is a cross-sectional view showing a state where a column is erected in the same manner.

FIG. 3 is an explanatory view showing a relationship between a cylinder-length nut and column reinforcement according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state in which a column according to another embodiment of the present invention is erected.

[Explanation of symbols]

P Reinforcement with foot for retrofitting post in concrete structure 1 Post 3 Nut of long cylinder 5 Screw bolt as foot 7 Short nut 9 Split groove 10 Parapet as concrete structure 11 Welding 13 Hole

Claims (2)

[Claims] 1. A pillar-shaped column with a foot, in which a hole is drilled in a concrete structure, inserted into the hole and fixed by injecting a hardening resin, a cylinder-length nut is inserted into a lower end portion of the column reinforcement. And a threaded bolt with a short nut is screwed into said leg as a foot for reinforcing a pillar with a foot for retrofitting a pillar in a concrete structure. 2. A post with post for retrofitting a post in concrete according to claim 1, wherein a split groove is provided on both side surfaces of a lower end portion of the post reinforcement for fixing the cylinder-length nut, and the split groove is welded. Reinforcement.