JPH0437133Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The invention relates to a reinforcing bar cage for a column in a reinforced concrete building.

``Conventional technology'' Traditionally, steel-framed reinforced concrete structures were the mainstream for the structures of super high-rise apartment buildings with 25 to 40 floors, but recently, reinforced concrete structures have been developed to reduce the cost of building blocks. There is.

In reinforced concrete high-rise buildings, it is especially necessary to ensure the toughness of the columns, and many shear reinforcing bars are arranged in the columns. That is, as shown in FIG. 9, a large number of hoops 3 are wrapped around the four corner and intermediate main reinforcements 1 and 2, and auxiliary reinforcements 4 for restraining the intermediate main reinforcements 2 are installed inside each hoop. In addition, the reinforcement of these hoops and auxiliary reinforcements is
Each piece is assembled exclusively on-site.

``Problem that the invention tries to solve'' Recently, spiral muscles etc. have been used in hoop 3, making it relatively less labor intensive.
Arranging the auxiliary reinforcing bars 4 still takes a lot of time and effort, and there are many pawls in the folded parts, making it difficult to fill with concrete.

Furthermore, there are still problems in securing the predetermined positions and restraint performance of the main reinforcements 1 and 2 at the four corners and in the middle, and there is a drawback that sufficient toughness cannot be obtained under high axial force and high shear force.

The present invention attempts to solve the above-mentioned conventional problems.

"Means for Solving the Problems" The present invention is characterized in that welded lattice reinforcements formed by joining reinforcing bars are provided, and the welded lattice reinforcements are installed horizontally with respect to the vertical main axis.

``Function'' With the above structure, welded lattice reinforcements can be prepared in advance at a factory to the specified dimensions, inserted into the main reinforcements, and simply bound to the main reinforcements by welding, etc. This kind of welded lattice reinforcement facilitates reinforcement work on site, secures the main reinforcement in the proper position, and exhibits high restraint performance and high toughness as a column, achieving the desired result. Achieve your purpose.

``Example'' Figures 1 to 6 show an example of the column of the present invention, in which a plurality of deformed or round steel reinforcing bars 51, 52 of appropriate length are arranged vertically and horizontally in the width of the column A and welded. Then, a plurality of welded lattice reinforcements 5 with a pitch of about 100 to 150 mm are created, and these welded lattice reinforcements are connected to a plurality of vertically arranged main reinforcements 1 and 2 at the four corners and in the middle, and a plurality of axial reinforcements 6 at the center of the column. horizontally and 80 to 100mm
The reinforcing bars are assembled one after another at a certain interval, and the predetermined intersections of the welded lattice bars and the main bars 1 and 2 are easily tied together by wires, welding, etc., to form a reinforcing bar cage. In this case, the welded lattice reinforcement located at the column base is particularly effective as a positioning reinforcement for the main reinforcement.

In addition, as shown in FIG. 4, the welding lattice reinforcements 5 are initially placed on top of the built-in main reinforcements 1 and 2 and the shaft reinforcement 6 in a stacked state.
All you have to do is pull them down in order from the lowest one, place them at predetermined locations, and tie them to their main bars and shaft reinforcing bars.

Concrete 7 can be poured into the reinforcing bar cages formed in this way in the same manner as conventional methods, and the resulting columns have high toughness against high axial forces and high shear forces during earthquakes, and are especially suitable for super high-rise reinforced concrete. Effective and suitable as building pillars.

Here, the weld lattice reinforcement 5 will be explained in more detail.

This welded lattice reinforcement 5 is made by arranging vertical and horizontal reinforcing bars 51 and 52 at appropriate intervals and welding the intersection points, and by thinning out the welding points or freely changing the number of reinforcing bars as necessary, the required yield strength and The aim is to have a restraining effect on the main reinforcement while ensuring toughness.

For the welded lattice bars 5, reinforcing bars with a diameter of approximately 6 to 22 mm are used depending on the situation, and the intersections are automatically welded by automatic welding means such as resistance welding for mass production. can also be omitted). This will improve quality, productivity, and save labor.

The strength of the welding point shall be equal to or higher than the tensile strength of the base metal. However, even if the welding point strength is in the low range of 15 to 30 kg/ ^mm2 , it is possible to adopt it as long as the structural performance of the entire planned column is ensured.

The protrusion of the ends of each vertical and horizontal reinforcing bars 51, 52 is 10~
30mm is better.

The vertical and horizontal reinforcing bars 51 and 52 can be arbitrarily selected from thick or thin ones, and if they are made thin, the number can be increased according to the design strength.
Also, if you want to make it thicker, you can reduce the number in the same way. For example, if a relatively thin piece with a diameter of about 13 mm is selected in a place where relatively high strength is required, the number of pieces is increased as shown in FIGS. 1 to 3. If you choose a relatively thick one with a diameter of about 16 to 22 mm, as shown in Figures 5 and 6,
The number can be the same as the conventional one or fewer than the conventional one. Note that when there are many main reinforcing bars 1 and 2, or when there are shaft reinforcing bars 6, it is better to use a large number of thin reinforcing bars in order to properly position them.

The load-deformation curves of the column in the column shear model of FIG. 7 in the case of using these welded lattice reinforcements 5 and in the case of the conventional hoop are as shown in FIG. 8. That is, in the case of the welded lattice reinforcement 5, the deformation capacity after the maximum load is greater than in the case of the conventional hoop, ensuring sufficient toughness and stable restoring force.

``Effect of the invention'' According to the invention, welded lattice reinforcements are used in place of conventional hoops and auxiliary reinforcements, so if the welded lattice reinforcements, which have been formed in advance at a factory with high precision and quality, are inserted into the main reinforcement. In addition, since there is no need for folded tabs as in the conventional method, it is possible to fill concrete well, improve accuracy and quality, and reduce construction costs.

Furthermore, since the welded lattice reinforcement serves as a positioning reinforcement for the main reinforcement, it not only improves the durability of the building structure, but also increases the restraint effect of the main reinforcement, which effectively restrains the core concrete, thereby preventing it from occurring during a major earthquake. The shear resistance against repeated alternating forces of high axial force and high shear force is increased, sufficient toughness is obtained, and a sticky and stable restoring force can be ensured.

[Brief explanation of the drawing]

1 to 4 show an example of implementation according to the present invention, FIG. 1 is a cross-sectional plan view, FIG. 2 is a perspective view of a welded lattice reinforcement, and FIG. 3 is an explanatory diagram of the configuration. Figure 4 is an explanatory diagram of the installation procedure, Figures 5 and 6 are cross-sectional plan views showing other examples, Figure 7 is a diagram showing a shear model of the column, and Figure 8 is the load on the column. - A graph showing a deformation curve. FIG. 9 is a cross-sectional plan view showing a conventional example. 1...Main bars at the four corners, 2...Main bars in the middle, 5...
Welded lattice reinforcement, 6... Axial reinforcement, 7... Concrete, A... Column.

Claims (1)

[Scope of utility model registration request] A reinforcing bar cage for a column in a reinforced concrete building, characterized in that welded lattice reinforcements formed by joining reinforcing bars are provided, and the welded lattice reinforcements are incorporated horizontally into vertical main reinforcements.