JPH0587627B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> This invention relates to an improvement in the construction method of a steel column base.

<<Prior Art>> Among the structural types of building structures, the method of fixing the base of a steel column in a steel frame concrete structure and a steel frame reinforced concrete structure has often been a method in which the anchoring portion is exposed using an anchor bolt.

However, this method has earthquake resistance problems, so in modern building structures, in order to reinforce the legs of the steel columns, recessed spaces are provided in the foundations or foundation beams that support the steel columns. A method of embedding and fixing the legs of steel columns in concave spaces has been adopted, and the number of uses for this method is increasing considerably.

By the way, this type of construction method for embedded steel columns has conventionally been carried out using the procedure described below.

First, after assembling the base reinforcement to be buried in the foundation, the column reinforcement (column main reinforcement and its reinforcing hoop reinforcement) surrounding the planned construction location of the steel column is connected to the base reinforcement and assembled into an upright state.

After that, in order to define a space for inserting a steel column inside the column reinforcement, welding or other methods are used to fix spacing members such as wire mesh, punched metal, metal lath, perforated steel plate, etc. to the outer periphery of the column reinforcement, and to form a space for inserting the steel column. After reinforcing the foundation beam, which will be constructed as an integral part, concrete is poured except for the inside of the separating member to form a concave space.

Next, after inserting the legs of the steel column into the concave space, the space is filled with mortar or the like to fix the steel column to the foundation.

However, this construction method has the following problems.

<<Problems to be solved by the invention>> In other words, in the above construction method, after assembling the column reinforcements,
Since the separation members are fixed before reinforcing the foundation beam, a series of reinforcing bars assembly work is interrupted, and the work cannot proceed smoothly, resulting in loss time.

In addition, in order to prevent concrete from blowing out from the bottom of the concave space during concrete pouring, it is necessary to arrange the separation members in a bottomed manner so as to cross the legs of the columns to be constructed. Installing this on the legs, where reinforcing bars are intertwined, has been an extremely difficult task.

This invention was made in view of the above-mentioned problems, and its purpose is to improve construction efficiency by eliminating difficult work on site and making it possible to perform a series of reinforcing bar assembly operations. The purpose of this invention is to provide a construction method for steel column bases.

<Means for Solving the Problems> In order to achieve the above object, the present invention forms a concave space in the foundation including the foundation beam at the location where the steel column is planned to be erected, and the steel column is placed in the concave portion. In the method of constructing a steel column base that fixes the legs, when forming the recessed space, after assembling the column reinforcement so as to surround the outer periphery of the concave space, a bottomed cylindrical shape is preliminarily installed inside the column reinforcement. The method is characterized in that concrete is poured after the formed separation member is inserted and installed.

《Operation》 In the construction method for the steel column base with the above configuration, the separation member for defining the insertion space for the steel frame is formed in advance in the shape of a cylinder with a bottom, and is installed by dropping it inside the column reinforcement. Therefore, the reinforcement for the foundation beam and the assembly of the foundation beam reinforcing bars can be carried out without interrupting the erection and assembly of the column reinforcements.

Further, since the separation member can be formed in advance, it can be standardized in accordance with the shape of the steel column.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5 show an embodiment of the construction method for a steel column base according to the present invention.

In the construction method shown in FIG. 1, first, the base reinforcements 12 of the foundation 10 are assembled, and the column reinforcements 16 are fixed to the base reinforcements 12 around the planned erection of the steel columns 14. It will be erected in

The column reinforcements 16 are a plurality of main reinforcements 16 arranged in the vertical direction.
a and a plurality of hoop reinforcements 16 that connect the main reinforcement 16a.
These columnar reinforcements 16a and hoop reinforcements 16b are assembled into a predetermined shape in advance, and the main reinforcements 1
The lower ends of the reinforcing bars 6a may be fixed to the base reinforcing bars 12, or the main reinforcing bars 16a and the hoop reinforcing bars 16b may be directly assembled at the construction site.

When the erection of the column reinforcements 16 is completed, the beam reinforcements 22 of the foundation beam 20 are assembled as shown in FIG. When assembling the foundation beam reinforcements 22, the beam reinforcement reinforcements 24 are also incorporated to reinforce the pull-out stress of the steel column 14 and the concave space 26. When the foundation beam reinforcements 22 around the concave space 26 are assembled in the state shown in FIG. It can be inserted and installed by dropping it inside.

The separating member 18 is made of wire mesh, punched metal, metal lath, perforated steel plate, etc. In this embodiment, the details of the separation member 18 are shown in FIG.
It has a cross-sectional shape similar to the inner circumferential shape of No. 6, and has a bottomed cylindrical shape in which a bottom plate 18b is inserted and welded into an outer plate 18a with open upper and lower ends.

The separating member 18 increases the adhesion between the post-cast concrete in the recessed space 26 and the concrete of the previously cast foundation beam 20, resists bearing stress, and also has a shear reinforcing function.

Then, in order to construct the foundation 10 and the foundation beam 20, a formwork is installed, concrete is poured except for the inside of the separation member 18, and the foundation 10 and the foundation beam 20 are constructed as shown in FIG. Form.

As a result, the portion surrounded by the separating member 18 is
A concave space 26 is formed with an open upper end.

Inside the concave space 26, a steel column 1 is inserted from above.
After the steel frame column 4 is erected, the legs of the steel frame column 14 are fixed by filling the concave space 26 with concrete or the like.

The steel column 14 erected through the above steps is
Since the legs are embedded in the foundation 10 or the foundation beam 20, their connection is extremely strong.

What should be noted here is that the separation member 18 used for inserting the steel column 14 is formed in advance into a cylinder shape with a bottom, and is installed by dropping it inside the column reinforcement 16. This means that not only can they be made with high precision, but also that the reinforcement work of assembling the column reinforcement 16, foundation beam reinforcement 22, and foundation beam reinforcement 24 can be performed continuously.

This will allow the construction work to proceed smoothly and greatly increase construction efficiency.

<<Effects of the Invention>> As described above in detail in the Examples, in the construction method of the present invention, when the legs of a steel column are fixed by the embedding method, the reinforcing work of the foundation beam can be continued without interruption. This eliminates the loss time associated with switching operations, greatly improving construction efficiency, shortening construction period and reducing costs.

Furthermore, the separating member that enables a series of reinforcement operations can be simply and easily installed by simply dropping it into the interior of the column reinforcement.

Moreover, by producing the separation member in advance at the factory,
Since it can be standardized to high dimensional accuracy, steel column bases can be constructed with stable quality.

[Brief explanation of drawings]

1 to 4 show the steps of the construction method of the present invention, and in each drawing, A is a plan view and B is a longitudinal sectional view. FIG. 5 is an exploded perspective view showing an example of the separating member. 10... Foundation, 12... Base reinforcement, 14... Steel column, 16... Column reinforcement 16a, b, 18... Separation member, 20... Foundation beam, 22... Foundation beam reinforcement, 24...
...Foundation beam reinforcement, 26...Concave space.

Claims (1)

[Claims] 1. In the construction method for steel column legs, in which a concave space is formed in the foundation including the foundation beam where the steel column is planned to be erected, and the leg of the steel column is fixed within the concave area, the concave space is formed. After assembling the column reinforcement so as to surround its outer periphery, a spacing member previously formed in the shape of a cylinder with a bottom is inserted and installed inside the column reinforcement, and then concrete is poured. Construction method for steel column bases.