JPH0220781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a column of a steel reinforced concrete composite structure.

In medium-to-high-rise buildings, the load that a column on each floor receives is the sum of the loads on the floors above that floor, so the load on the column is reduced as you move up the floor, and the strength of the column is determined accordingly. Ru. BACKGROUND ART Conventionally, columns in mid-to-high-rise steel-framed reinforced concrete buildings have been made of steel H-beams depending on the load, whereas columns for upper floors have been made of reinforcing bars arranged on-site instead of using steel frames. In this type of column, measures are taken to increase the number of reinforcing bars to prevent a sudden drop in strength at the joint between the steel frame and the reinforcing bars on the upper floors. However, this method had the problem of increasing the amount of steel and requiring time and effort to arrange the reinforcement.

The purpose of the present invention is to reduce the amount of steel material, and another purpose is to improve workability. A feature of the present invention is that a joint pipe is attached to a steel column via an attachment member, and a reinforcing bar is connected to this joint pipe.

Embodiments of the present invention will be described below based on the drawings.

In Figure 1, column main reinforcements 2 and 2a are arranged at the four outer corners of a column steel frame 1 made of H-section steel, and each column main reinforcement extends above the column steel frame to the upper floor, and the column main reinforcement is connected to a hoop. 3 is hung around it. Another column main reinforcement 4... is arranged between the column main reinforcements 2 and 2a, and the lower end of each column main reinforcement 4... is connected to the flanges 1a, 1a of the column steel frame 1 by the connecting parts 5... It is installed. Column main reinforcements 4 are cut at appropriate upper floors as necessary,
A hoop 3 is hung above the column steel frame 1 together with the column main reinforcement 2.

Here, the specific structure of the connecting portion will be explained with reference to FIGS. 1 and 2.

On the outer surface of each flange 1a, 1a of the column steel frame 1, a pair of joint pipes 6 are installed vertically along the outer surface.
... are attached via a mounting plate 7, which is a mounting member. That is, the joint pipe 6... has a female threaded portion on its inner circumference. Coupling pipe 6...
One end surface of a mounting plate 7 is attached in the axial direction to the outer circumference of the mounting plate 7 by being fixed or integrally molded, and the other end surface of this mounting plate is fixed to the flanges 1a, 1a by a method such as welding. The mounting plate 7 is provided so that the mounting position of the joint pipe 6 can be arbitrarily set with respect to the flanges 1a, 1a by appropriately changing its height and mounting position.
This is to prevent thermal deformation of the pipe that occurs when the joint pipe is directly welded to the flange. Note that the attachment member is not necessarily limited to a plate, and may be, for example, a rod or a support having a triangular cross section.

Further, a joint pipe 8 is attached to the lower end of the upper column main reinforcement 4, and this joint pipe is located opposite to the joint pipe 6 on the column steel frame 1 side. A female threaded portion is provided at the lower end opening of the joint pipe 8. And joint pipe 6... and 8
Both ends of a threaded rod 9 are screwed into each female threaded part of the column main reinforcement 4.
... and the column steel frame 1 are connected. Nuts 10 and 11 attached to the threaded rods 9 fix the connection between the joint pipes 6 and 8 (column steel frame 1 and column main reinforcement 4). Therefore, the stress in column main reinforcement 4...
is directly transmitted to the column steel frame 1 via the joint pipe 6 .

Next, to explain the construction, the threaded rod 9
is attached to either the joint pipe 6 or 8, for example, the joint pipe 6. Therefore, first, build the column steel frame 1, then arrange the column main reinforcement 2, then arrange the upper column main reinforcement 4 above the column steel frame 1, and connect the joint pipe 8 at the lower end with the joint pipe 6 of the column steel frame. Position them facing each other. When the nuts 10 and 11 are brought into close contact with each other and both nuts are turned, the threaded rod 9 rotates in conjunction with the threaded rod 9, moves toward the joint pipe 8, and is eventually screwed into the inside thereof. When the end of the threaded rod 9 enters the joint pipe 8 by a predetermined amount, the movement of the threaded rod is stopped, and then one nut 10 is moved and the end of the threaded rod 9 is inserted into the joint pipe 6.
Press strongly against the upper end surface of the other nut 11 in the same way.
The threaded rod is firmly pressed against the lower end surface of the joint pipe 8 to fix the connection between the joint pipes using the threaded rod (FIG. 2).
The remaining upper column main reinforcements 4 are also connected to the joint pipe 6 in the same manner. In this way, the work of connecting the upper column main reinforcement 4 to the column steel frame 1 is completed. After that, the hoop 3 is hung around the main pillar reinforcements 2 and 4, and then form work is carried out and concrete is poured.

Another embodiment is shown in FIG. In this example, the joint pipe 1 constituting the connecting portion 15
The mounting plates 17 of 6 are attached to each corner of a rectangular frame 22 fixed to the flanges 1a, 1a so as to surround the upper end of the steel column 1. The lower column main reinforcements 12 and the upper column main reinforcements 14 arranged on the outside of the column steel frame 1 are both connected by connecting parts 15.
They are connected to each other and to the column steel frame. That is, as shown in FIG. 4, a joint pipe 18a is attached to the upper end of the lower column main reinforcement 12, and this joint pipe is connected to the joint pipe 16 on the column steel frame 1 side by a threaded rod 19a, and this connection is connected with a nut 20a,
It is fixed at 21a. Further, a joint pipe 18 is fixed to the lower end of the upper column main reinforcement 14, and this joint pipe is connected to the joint pipe 16 with a threaded rod 19, and fixed with nuts 20 and 21. In this example, the mounting member of the joint pipe 16 is the mounting plate 17.
and a frame 21. 13 is a hoop.

To explain the construction in this example, the threaded rods 19, 19a are attached to, for example, the joint pipe 16 in advance. First, the column steel frame 1 is erected, and the upper end of the lower column main reinforcement 12 is positioned opposite to the lower end of the joint pipe 16, and the threaded rod 19a is screwed into the upper end opening of the joint pipe 18a. Connect to the joint pipe 16. After that, the upper column main reinforcement 14 is arranged, the threaded rod 19 is screwed into the lower end opening of the joint pipe 18, and the joint pipe 1
6 and the column main reinforcement 14 are connected. Then hoop 1
Place reinforcement 3.

Further, FIG. 5 shows another embodiment. In this example, components that are substantially the same as those shown in FIG. 3 are given the same reference numerals as in the embodiment shown in FIG. In this structure, the joint pipe 16a is a mere cylinder without a female thread formed inside (Fig. 6), and two mounting plates 17, 17a are attached to the pipe in a perpendicular state. One mounting plate 17, 17 is attached to the column steel frame 1
The other mounting plates 17a, 17a are connected to the opposing mounting plates 17a, 17a of the other joint pipe by connecting plates 23, 23. Further, a threaded rod 19c having threaded portions at both ends passes through the joint pipe 16a, and both ends of this threaded rod are screwed to the joint pipes 18a, 18 of the column main reinforcements 12, 14, respectively.
This connection is fixed with nuts 21, 21a.

In the present invention, the upper column main reinforcing bars 14 may be pre-assembled instead of being arranged on-site.
Alternatively, the ends of the main column reinforcements 4, 14, 12 may be directly screwed into a joint pipe attached to the column steel frame 1 to connect them.

As explained above, according to the present invention, the main column reinforcement is attached to the column steel frame via the joint pipe, so the stress of the column main reinforcement is directly transmitted to the column steel frame, resulting in a sudden decrease in the proof strength of the joint part of the column. Moreover, since there is no need to increase the number of reinforcing bars as in the conventional method, the amount of steel material can be reduced, which is economically advantageous. In addition, there is no need to arrange reinforcing bars for reinforcement, and the connection work between the column main reinforcement and the joint pipe is easy.
Improves work efficiency.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main part, Fig. 2 is an enlarged sectional view showing the state of connection between the joint pipe and the main column reinforcement, Fig. 3 is a perspective view showing the main part of another embodiment, and Fig. 4 is the joint FIG. 5 is an enlarged sectional view showing the connected state of the pipe and the main column reinforcement, FIG. 5 is a perspective view showing the main part of another embodiment, and FIG. 6 is an enlarged sectional view showing the connected state of the joint pipe and the main column reinforcement be. 1... Column steel frame, 2, 2a, 12... Column main reinforcement,
4,14...Column main reinforcement, 5,15...Connection part, 6,
16, 16a...Joint pipe, 7, 17, 17a
... Mounting plate, 8, 18, 18a ... Coupling pipe, 9, 19, 19a, 19c ... Threaded rod, 22
...Frame body, 23...Connection plate.

Claims (1)

[Scope of Claims] 1. A column steel frame, a column main reinforcement arranged above the column steel frame, and a joint pipe attached to the outer surface of the column steel frame via a mounting member and extending along the axial direction of the column steel frame. and a column of a steel-reinforced concrete composite structure, wherein the coupling pipe connects the column main reinforcement to the column steel frame.