JPS61277730A - Pillar structure - 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 (a) Field of Industrial Application The present invention relates to a column structure suitable for application to columns in high-rise buildings, for example, reinforced concrete (RC) buildings with over 30 floors.

(b), Prior Art Recently, a method of constructing high-rise buildings using reinforced concrete is being used.

(C) 0 Problems to be Solved by the Invention However, the axial force generated in columns increases as buildings become taller, and it is difficult for ordinary reinforcing bars to bear this burden. There was a desire to develop a column structure that could effectively support the

In view of the above-described circumstances, the present invention aims to provide a column structure made of reinforced concrete that can provide strong resistance to axial force.

(d) Means for solving the nine problems, that is, the present invention provides a column formwork (7) on the outer periphery of the column (2), and the column formwork (7) is made of ultra-high strength concrete. It is formed of a frame body (7a) and compressive force applying means (7d) that applies compressive prestress in the axial direction to the frame body (7a), and further cast-in-place concrete (6) is placed in the column formwork (7). Constructed by pouring and filling.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The following r (el
The same applies to the column ``, action''.

(e) 6 Effects With the above-described configuration, the present invention is capable of compressing until the prestress acting on the frame (7a) is balanced against the tensile force until the prestress on the frame (7a) and the tensile force are balanced. For force, the sum of prestress and compressive force is the frame (7a)
The column (2
) acts to increase the resistance to the axial force.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing an embodiment of a columnar structure according to the present invention; Figure 2 is a side view of the pillar in Figure 1; FIG. 3 is a sectional view showing an example of the connection mode of the column formwork as shown in FIG. FIG. 4 is a plan view showing another embodiment of the present invention.

As shown in FIG. 2, the building 1 has columns 2 provided vertically in the figure with respect to the floor 4, and the columns 2 are connected to the column formwork 7 as shown in FIG. have. The column formwork 7 has a frame 7a that forms the outer periphery of the column 2 and is formed into a rectangular cylindrical shape in the vertical direction in FIG. 2, that is, in the direction along the axis of the column. is formed from precast ultra-high strength concrete (for example, concrete with a compressive strength of about IQQQkg/Ci). In the frame 7a, a plurality of main reinforcements 7b are arranged along the outer periphery of the frame 7a, and around the main reinforcements 7b, hoop reinforcements 7C are provided at predetermined intervals in the vertical direction in FIG. It is being Further, PC1iW wires 7d are stretched in the direction along the axis of the frame 7a, that is, in the vertical direction of the pillar 2, and apply compressive prestress to the frame 7a.

Furthermore, as shown in FIG. 3, known metal fittings 7e connected to the main bars 7b are provided at the upper and lower ends of each frame 7a, and each column form 7 is arranged in the vertical direction. The dial is connected via the Indian hardware 7e.

By the way, in the part surrounded by the column formwork 7, which has a circular cross section in FIG.
These main reinforcements 2a are provided with hoop reinforcements 2b as shown in FIG. 2.

In addition, in the circular section in FIG. 1 surrounded by the column formwork 7,
Cast-in-place concrete 6 is poured and filled.

Since the building 1 has the above configuration, for example,
The frame body 7a of the column formwork 7 is made of ultra-high strength concrete of 1000 kg/c-, and the PC steel wire 7d is made of 500 kg/c-
When the column formwork 7 is formed with a tensile force of ad applied, a compressive force of 500 kg/cd is applied to the frame body 7a as a prestress in the axial direction of the frame body 7a, that is, in the vertical direction in FIG. It will work. In this state, if a tensile force is applied to the column 2 in the vertical direction in FIG.
It can resist tension until the compressive force of c1j is canceled out.

Furthermore, when compressive force is applied to the column 2, the ultra-high strength concrete constituting the frame 7a will already have a load of 500 kg/kg.
Since a compressive force of c+/ is acting, the compressive force is 10
It is possible to resist compression until reaching 00 kg/cd.

In addition, although the above-mentioned example described the case where the PCill wire 7d was used as the compressive force applying means for applying compressive force to the frame 7a, the PCill wire 7d was used as the compressive force applying means.
In addition to d, it is naturally possible to use high-performance fibers such as aramid fibers and carbon fibers.

In addition, when constructing the column 2, the column formwork 7 is used as a formwork, and after the column formwork 7 is erected, the concrete 6 is placed in the column formwork 7.
Construct pillar 2 by pouring it inside.

In addition, as for the column formwork 7, as shown in FIG. 2, in addition to the structure in which main reinforcements 7b are provided on the column formwork 7 itself, as shown in FIG. It is also possible to use a structure in which all the main reinforcements are provided in the part where the cast-in-place concrete 6 is filled without providing them. In addition, as shown in FIG. 1, by providing the main reinforcement separately for the column formwork 7 and the part where the cast-in-place concrete 6 is filled, the reinforcement in the space where the cast-in-place concrete 6 is placed can be improved. Since the density can be lowered, it becomes possible to use high-quality, low-slump concrete as cast-in-place concrete.

(g) 6 Effects of the Invention As explained above, according to the present invention, the column form 7 is provided on the outer periphery of the column 2, and the column form 7 is formed into a frame 7a made of ultra-high strength concrete. The frame body 7a is formed from a compressive force applying means such as a PC steel wire 7d which applies compressive prestress in the axial direction, and cast-in-place concrete 6 is placed in the column form 7.
Since the structure is constructed by pouring and filling, the column formwork 7 can add a high degree of resistance to axial forces such as compression and tension to the column 2.
It is possible to construct highly reliable pillars 2 even in wooden buildings.

[Brief explanation of drawings]

1 is a plan view showing an embodiment of a column structure according to the present invention; FIG. 2 is a side view of the column shown in FIG. 1; FIG. The figure is a plan view showing another embodiment of the invention. 2... Columns 2a, 7b... Main reinforcing bars 6... Cast-in-place concrete 7... Column formwork 7a... Frame 7d... ...Compressive force applying means (p c @' line) Applicant Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji Figure 1 Figure 2

Claims (2)

[Claims] (1) For columns made of reinforced concrete, a column formwork is provided around the outer periphery of the column, and the column formwork is compressed to apply axial compression prestress to the frame body made of ultra-high strength concrete. A column structure formed from a force applying means and further constructed by pouring and filling cast-in-place concrete into the column formwork. (2) The main reinforcing bars constituting the columns are provided dispersedly in the column formwork and in the part of the column formwork where cast-in-place concrete is poured and filled. Column structure.