JPS6354095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing a steel column base, and more particularly to improving a column base when a steel column is embedded in a reinforced concrete foundation or foundation beam.

By the way, the applicant has already proposed a method of erecting steel columns into holes pre-drilled in the foundation and foundation beams (patent application).
No. 56-168836) and a device for resisting the bearing force applied to the base of the steel column and preventing local fracture of concrete (Utility Application No. 57-95791).

In addition to the above-mentioned purpose, this invention also provides shear reinforcing bars (hoops) for column main reinforcement around steel columns.
The gist of this is that ``the legs of the steel column and the main column reinforcing bars placed around the legs are surrounded by a material that resists bearing stress and a material that also has a shear reinforcing function, and concrete is poured into the foundation or foundation beam. After installation, a steel column is erected in the space surrounded by the material, and the space is filled with concrete, mortar, etc.

This will be explained below according to the drawings.

FIG. 1 shows a preferred embodiment of the present invention. Reference numeral 1 denotes a material that resists bearing stress and also serves as a shear reinforcing function. Here, a perforated steel plate was used. Arrange the main reinforcing bars 8 and stakes 9 of the foundation or foundation beam 3,
The perforated steel plate 1 and the column main reinforcing bars 4 are arranged, and the concrete 6 of the foundation or foundation beam 3 is poured. After the concrete 6 hardens, the steel column 2 is erected in the space surrounded by the perforated steel plate 1, and the space is filled with concrete, mortar, etc. 7, and the work is completed.

Fig. 2 shows a conventional example of side columns and corner columns of a steel-framed reinforced concrete structure or a steel-framed structure.If there is little cover between the steel column 2 and the concrete of the foundation or foundation beam 3, the concrete will be destroyed by the bearing force. Since both strength and rigidity are reduced, which poses a problem in terms of earthquake resistance, the current situation is that the problem is not solved by simply inserting inclined reinforcing bars 10.

FIG. 3 shows another embodiment of the invention, which solves the problems in FIG. A reinforcing material attachment plate 11 is fixed in advance by welding or the like to the side surface of the material 1, which serves as a material resisting bearing stress and a material 1 that also serves as a shear reinforcing function, and a reinforcing material 12 such as a reinforcing bar is attached to the plate 11. .

In this explanatory drawing, the reinforcing material 12 attached to the plate 11 is shown to be provided only in one direction of the foundation beam 3, but it can be reinforced in multiple directions using the same method if necessary. Furthermore, this construction method is similar to that described in FIG. Further, as the material 1 which also serves as a material resisting bearing pressure stress and a shear reinforcing function, a perforated steel plate is shown in the explanatory diagram, but expanded metal, metal lath, etc. can also be used.

As described in detail above, the present invention uses the material 1 that resists bearing stress and also has a shear reinforcement function, so it is possible to prevent the concrete of the foundation or foundation beam from breaking due to bearing stress, and the shear reinforcement It also plays the role of a hoop.

Furthermore, since steel columns can be erected at any time after the foundation or foundation beams are concreted, there are advantages such as being able to proceed with on-site work such as backfilling and external scaffolding, regardless of the timing of steel frame fabrication. It is something.

[Brief explanation of the drawing]

Figures 1 and 3 show examples of the present invention; Figure 1 is a perspective view of the main parts taken out after concrete pouring;
FIG. 3 is a plan sectional view, and FIG. 2 is a plan sectional view according to the conventional construction method. 1... Material that resists bearing stress and material that also serves as shear reinforcement function, 2... Steel column, 3... Foundation or foundation beam, 4... Column main reinforcing bar, 5... Shear reinforcing bar (hoop), 6 ... Pre-cast concrete, 7... Post-cast concrete, 8... Foundation beam main reinforcing bars, 9... Stirrup, 10... Inclined reinforcement bars, 11... Reinforcement attachment plate, 12... Reinforcement material.

Claims (1)

[Scope of Claims] 1. A leg of a steel column embedded in a reinforced concrete foundation or a foundation beam, in which the leg and main column reinforcing bars placed around the leg are made of a material that resists bearing stress and After surrounding the space with a material that also has a shear reinforcement function and pouring concrete for the foundation or foundation beam, a steel column is erected in the space surrounded by the material, and the space is filled with concrete, mortar, etc. A method of reinforcing the base of a steel column. 2. The method for reinforcing a steel column base according to claim 1, wherein the material that resists the bearing stress and the material that also serves as a shear reinforcing function are expanded metal, steel plate, metal lath, or the like. 3. Claims 1 and 2, characterized in that a plate for attaching a reinforcing material is fixed to the side surface of the material that resists the bearing stress and the material that also serves as a shear reinforcing function, and further a reinforcing material is attached to the plate. A method for reinforcing a steel column base as described in item 2.