JP2516653B2 - Exposed type fixed pedestal - Google Patents

Description

TECHNICAL FIELD The present invention relates to an exposed fixed column base using an anchor bolt.

[Conventional technology]

As a form of fixing the column base of the building to the foundation structure,
There are embedded type, root-wound type and exposed type that uses anchor bolts, but the exposed type has advantages such as wide space available on the foundation floor and good workability.

In the exposed type, anchor bolts are embedded in the concrete of foundation structures such as foundation beams in advance, and the base plate at the lower end of the column base is connected and fixed to the anchor bolts to fix the column base. Japanese Patent Publication No. 61-1574 discloses an example of such an exposed type column base fixing structure, and in Japanese Utility Model Publication No. 60-8305 and Japanese Utility Model Publication No. 62-154044, the column base is fixed. An anchor bolt fixing structure for a vehicle is disclosed.

As a general construction method in the conventional exposed type column base fixing structure, first, earthwork such as root cutting and gravel piling is performed, and after discarding concrete is placed, marking is performed, and then the anchor bolt is placed. The fixing frame is fixed. Actual Kaisho
The inventions disclosed in Japanese Patent No. 60-8305 and Japanese Utility Model Laid-Open No. 62-154044 are intended to improve the workability and the work accuracy at that time, and connect a plurality of anchor bolts with upper and lower attachment plates. The anchor bolt itself forms the anchor frame.

Anchor bolts are embedded in concrete after the reinforcement of the foundation floor and foundation beams, and in the case of the devises of Shokai 60-8305 and 62-154044, remove the upper attachment plate and remove nuts, etc. Is used to fix the base plate at the bottom of the column base.

[Problems to be Solved by the Invention]

By the way, when forming the anchor frame by the anchor bolt itself, the following two methods are performed as a reinforcing method around the anchor bolt.

A method of winding the hoop muscle 15 directly on the anchor bolt 1 (see FIGS. 2 (a) and 2 (b)).

A method in which a rising streak 18 is provided at an outer corner of the anchor bolt 1 and a hoop streak 17 is wound around the rising streak 18 (see FIGS. 3A and 3B).

However, in the case of, there is a problem that the column member 8 is subjected to a moment, and thus the split fracture 16 as shown in FIG. 2B is likely to occur near the outer peripheral position of the base plate 9 of the basic concrete 19.

On the other hand, in the case of 1, since the covering thickness of the concrete is required, there is a problem that the dimension of the column base portion of the basic concrete 19 becomes too large as shown in FIG. 3 (b).

The present invention has been made to solve the above problems.

[Means for solving the problem]

Hereinafter, an outline of the present invention will be described using reference numerals in the drawings corresponding to the embodiments.

In the exposed fixed column base of the present invention, the column base reinforcements A arranged around the plurality of anchor bolts 1 are provided in a plurality of rising lines 3 other than the corners and the rising lines 3 are provided.
And a hoop streak 2 wound so that the planar shape thereof has substantially the same size as the outer shape of the base plate 9 of the pillar member 8 in a pillar shape. The hoop muscle 2 and the rising muscle 3 are integrated by welding or by using a binding wire or the like. Also,
The hoop muscle 2 may be composed of a plurality of hoop muscles or a continuous spiral shape.

〔Example〕

 Next, the illustrated embodiment will be described.

FIG. 1 shows one embodiment of the column base reinforcement of the exposed fixed column base of the present invention. The column base reinforcement A has a plurality of rising lines 3 other than the corners and a rising line. Muscle 3
And a plurality of hoop muscles 2 wound around the to form a pillar shape. The column base reinforcements A are arranged so as to surround a plurality of anchor bolts 1 whose lower part is embedded in the foundation concrete, and the plan shape of the hoop reinforcements 2 arranged around the rising reinforcements 3 is the pillar material 8. The outer dimensions of the base plate 9 are substantially the same. FIG. 1 shows an arrangement example of the anchor bolt 1 along with the anchor bolt 1.

4 and 5 show the construction of the exposed fixed column base of the present invention.

At the time of construction, first, as a groundwork, root cutting is performed to a predetermined depth, and thrown concrete is placed on the gravel, etc., and the fixing body 4 is fixed on it by using bolts or hole-in anchors. To do. Instead of the throw-away component, a PC plate or the like may be laid horizontally, the surroundings may be fixed with the throw-away component, and the fixing body 4 may be fixed on the PC plate. The fixing member 4 in this embodiment is formed by crossing grooved steel in a cross shape and welding a steel plate having substantially the same shape as that of the lower addition plate 5 thereon.

Next, the lower addition plate 5 is installed on the fixing body 4, and the lower end portions of the plurality of anchor bolts 1 having threads formed at the ends are passed through the bolt insertion holes of the fixing body 4 and the lower addition plate 5, and the upper and lower portions are vertically moved. The nut bolt 7 is used to fix the upper end portion of the anchor bolt 1 using the nut 7, and the upper addition plate 6 is used to form the anchor frame using the anchor bolt 1 itself.

Subsequently, as an anchor frame, the anchor bolt 1 set at a predetermined position is overlaid with the column base reinforcement reinforcement A formed in a column shape by the hoop muscles 2 and the rising muscles 3 (first (See Fig. 4), and further reinforcement of the bottom plate and reinforcement of the foundation beam 12.

After arranging, the formwork is assembled, the concrete of the bottom plate 13 is cast, and then the concrete of the foundation beam 14 is cast. The casting height of the rising part is the height at which the upper part of the anchor frame A projects from the concrete surface. Become. The screws at the upper end of the anchor bolt 1 should be protected with vinyl tape or the like so that concrete does not adhere to them.

After the concrete hardens and demolds the formwork, the nut 7
Is loosened, and the upper addition plate 6 is removed.

Next, the pillar cores of the suspended pillar members 8 are aligned, and fixed to the upper ends of the anchor bolts 1 with nuts 11 through the bolt insertion holes of the base plate 9 of the pillar members 8 (see FIG. 5). In the figure, 10 is the same as the injection washer disclosed in JP-B-61-1574. From this injection washer 10, a grout material is injected,
The coupling strength of the column base can be increased.

The number and arrangement of the anchor bolts 1 can be changed as appropriate.

[Advantages of the Invention] Since the planar shape of the hoop streak has almost the same size as the outer shape of the base plate of the pillar material, the concrete around the anchor bolt is effectively reinforced and the split fracture of the basic concrete is prevented. You can

Since there are no rising streaks at the corners of the hoop, it is possible to reduce the dimensions of the basic concrete, which is economical and economical.

[Brief description of drawings]

1 (a) and 1 (b) are a plan view and a front view showing the basic shape of a column base reinforcing bar in an exposed fixed column base of the present invention, and FIGS. 2 (a) and 2 (b) are conventional columns. 3 is a perspective view and a vertical sectional view showing an example of leg reinforcement, FIGS. 3A and 3B are perspective views and vertical sectional views showing another conventional example of column base reinforcement, and FIG. 4 is a column base reinforcement. FIG. 5 is a perspective view showing how the streak is installed, and FIG. 5 is a perspective view showing the outline of the column base fixing portion with the basic concrete omitted. A: Column base reinforcement, 1 ... Anchor bolt, 2 ... Hoop, 3 ... Rise, 4 ... Fixing body, 5 ... Bottom plate, 6 ... Top plate, 7 ... Nuts, 8 ... Pillars, 9 ... Base plate, 10 ... Injection washers, 11 ... Nuts, 12 ... Foundation beam arrangement, 13 ... Foundation floor, 14 ... Foundation beams, 15 ... Hoop reinforcement, 16 …… Splitting fracture, 17 …… Hoop reinforcement, 18 …… Rise reinforcement, 19 …… Foundation concrete

Continued Front Page (72) Keiichi Abe, Inaichi, Urayasu City, Chiba Prefecture 51-1 (72) Inventor, Harukatsu Sumiya, 1-11-6-210, Masago, Chiba City, Chiba Prefecture (72) Norio Noda, Kashiwa City, Chiba Prefecture Masuo 1660-4 (72) Inventor Keisuke Sugiura 2-635 Takeishi-machi, Chiba-shi, Chiba (56) References JP-A-1-203523 (JP, A) JP-A-163320 (JP, A) 60-58645 (JP, U)

Claims (1)

(57) [Claims] 1. An exposed fixed column base in which a base plate of a pillar is fixed to a plurality of anchor bolts whose lower part is embedded in a concrete foundation, so that the planar shape is almost the same as the outer shape of the base plate of the pillar. It is characterized in that the hoop reinforcement wound around the corner is joined to a plurality of upstanding reinforcements provided other than the corners, and the column base reinforcement is formed around the anchor bolts. Exposed fixed column base.