JPS5921847A - Anchoring of embedding type pillar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention relates to an improvement in a method for fixing the embedded type column base of a steel pipe column in a steel-framed building, and more specifically, to reinforcement construction for firmly integrating the steel pipe column base with a reinforced concrete foundation beam. Pertaining to law.

When rectangular steel pipe columns are used as embedded fixed column bases in steel frame buildings, it is common practice at present to place the main reinforcement of the foundation beam around the rectangular steel pipe column and fix it there), for example, as shown in Figure 1. The end portion 25 of the main reinforcement 2 in the foundation beam 1 is bent and fixed along the side surface of the column base portion 4 of the square steel pipe column 3 as shown in FIG. In this case, the force applied to the main reinforcement 21 of the foundation beam on one side of the steel pipe column is
2, the main reinforcement 23 in the direction perpendicular to the main reinforcement 21 must be
It is necessary to extend the connecting bars 241, 242, and 243 to the main bars 21 and 22 to transmit the force from the main bars 21 to 22, but the force transmission path is complicated and the reliability of the design calculation is low, or The amount of concrete placed for the steel pipe column leg section 5 increases. Alternatively, due to external forces during an earthquake, etc., the steel pipe column is mechanically disconnected from the foundation beam where the main reinforcement and concrete are integrated, and complete force transmission between the foundation beam and the column base cannot be expected. There is a problem.

The purpose of this invention is to provide an embedded method for fixing the base of a steel pipe column that solves the above-mentioned problems. Assemble a concrete formwork for the beam, erect the steel pipe column at a predetermined position within the formwork, arrange the main reinforcement of the foundation beam through the through hole on the side of the foot of the steel pipe column, install reinforcing bars, and place the concrete in the concrete formwork. This relates to a method for fixing an embedded type column base of a steel pipe column, which is characterized in that concrete is poured inside the steel pipe column base and solidified.

Next, the present invention will be described in detail with reference to the embodiments shown in the attached FIGS. 2-4. Each side 61.62 of the column base of the steel pipe column 6
．． At 63 and 64, a required number of through holes 8 for passing through and arranging the main reinforcements 7 of the foundation beam are pre-drilled at the factory according to the reinforcement design.

It is convenient to open the through holes 8 at different heights on each opposing side surface so that they do not interfere with each other when passing the intersecting main reinforcements.

At the site, a concrete formwork 9 for the foundation beam is assembled according to the design drawings, and the steel pipe columns are erected at predetermined positions within the formwork.

Reinforcing bars are connected to the leg side surfaces 61, 62 and 63 of the steel pipe column 6 and arranged within the foundation beam concrete formwork.

Once the reinforcing bars have been assembled, formwork l.

At the same time, concrete is poured into the base of the steel pipe column using the usual method and allowed to harden. Thereafter, the formwork can be removed after an appropriate solidification period as usual.

As explained above, the method of the Japanese application is to first drill through holes for the main reinforcement of the foundation beam at predetermined positions on the side faces of the opposing legs of the steel pipe columns in advance at the factory, and after the steel pipe columns are erected at the predetermined positions on-site, the column bases are The main reinforcement of the steel pipe column can be passed through the column from one side of the steel pipe column to the opposite side through the through hole, and the reinforcement of the foundation beam can be assembled within the concrete formwork of the foundation beam. Since the fixing section is not required, the work of bending the reinforcing bars is not only unnecessary, but also the reinforcing bars can be arranged and assembled very easily, and the work of assembling the reinforcing bars can be made more efficient.

In addition, since the main reinforcement is passed through from one side of the column base to the opposite side, the work is easier than fixing the main reinforcement end to the side of the steel pipe column base by welding, etc. A) There is no risk of peeling in poorly welded areas due to external force, and after concrete is poured, the force is transmitted directly from the main reinforcement of one beam to the main reinforcement of the opposing beam through the straight main reinforcement. Therefore, reliability is extremely high.

Alternatively, the filling concrete inside the steel pipe column base can be used as part of the anchorage, and the concrete of the foundation beam and the filler concrete of the column base are integrated with the penetrating main reinforcement, which increases the reliability of the rigidity or strength of the column base. will improve.

Alternatively, since there is no need for reinforcement for connecting the column base round, the volume of concrete placed in the column base round 10 can be reduced, or when constructing a foundation beam, the reinforcement arrangement was conventionally complicated and the amount and number of reinforcing bars were limited. Although it was difficult to ensure complete filling of poured concrete due to the large amount of concrete being placed, this method has extremely large practical effects, such as ensuring that the concrete surroundings are at perfect pressure.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the conventional reinforcing method for foundation beams, Figure 2
The figures are also plan views, Figure 3 is a longitudinal sectional view for explaining the reinforcement method for foundation beams according to method (4) of the present invention, Figure 4 is a plan view, and Figure 5 is a schematic diagram showing one embodiment. FIG. 1...Foundation beam, 6...Steel pipe column base, 71.72-.
・Main reinforcement, 8... Through hole, 9... Concrete formwork,
61.62.63.64...Column base side view Applicant's agent Patent attorney Kamoshi 1) Tsugumi Figure 7 Figure '2. Figure 3 Figure 3

Claims (1)

[Claims] A hole is drilled in the side surface of the steel pipe column base to allow the main reinforcement of the foundation beam to pass through, a concrete formwork for the foundation beam is assembled, the steel pipe column is erected at a predetermined position within the formwork, and a through hole is drilled in the side surface of the steel pipe column base. The embedding of a steel pipe column is characterized by arranging the main reinforcement of the foundation beam through it, assembling the reinforcing bars, and pouring concrete into the concrete formwork, as well as pouring concrete inside the steel pipe column leg and solidifying it. How to fix type column legs