JP2973776B2 - How to build pillars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed structure in which an S column is connected to an RC column, and in particular, the RC column is successively added while interposing a diaphragm for connecting the S column. The present invention relates to a method constructed using a PC member.

[0002]

2. Description of the Related Art Conventionally, in the case of adopting a mixed structure of RC columns and S columns, when this RC column is to be constructed by successively adding PC members, the structure shown in FIG. As described above, this is performed by interposing the diaphragm 2 for connecting the S beam between the PC members 1 and 1a. The diaphragm 2 includes a tubular steel pipe portion 4 surrounding the outer periphery of a mold 3 having the same diameter as the PC members 1 and 1a.
A pair of upper and lower flanges 5 and 6 formed of a steel plate are fixed to the upper and lower ends of the pair. At the center of the upper and lower flanges 5, 6, openings 5a, 6 having substantially the same diameter as the inner diameter of the PC members 1, 1a are provided.
a is formed, and an S beam (not shown) is connected to the outer periphery of the tubular steel pipe portion 4.

[0003]

However, in such a conventional method of constructing a pillar, when the PC members 1 and 1a are sequentially stacked while the diaphragm 2 is interposed,
It is often difficult to arrange the lower end of the upper PC member 1a placed on the upper flange 5 horizontally. Therefore, PC
Level adjustment is performed to make the lower end of the member 1a horizontal, and then the gap between the lower end of the PC member 1a and the upper flange 5 is filled with a grouting agent 7 such as mortar to ensure integration between them. It is supposed to.

However, the grouting agent 7 is used for the PC member 1.
Since the grout agent 7 is injected into the gap from the outside of the PC member 1a, the grout agent 7 penetrates into the inside of the PC member 1a and accumulates on the upper surface of the concrete 8 cast on the PC member 1 below in the previous step. For this reason, there is a problem that the injection amount of the expensive grouting agent 7 is significantly increased.

In view of the above-mentioned problems, the present invention fills a grout agent between an upper flange of a diaphragm for connecting an S beam and a PC member for constructing an RC column. At this time, while reliably preventing the grouting agent from entering the inside of the PC member, the diaphragm and the P
It is an object of the present invention to provide a method for constructing a column capable of increasing the strength of coupling with a C member.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to construct an RC column by sequentially adding cylindrical PC members while interposing a diaphragm for connecting S beams. A diaphragm, wherein the diaphragm is fixed to upper and lower ends of the tubular steel pipe portion for connecting the web of the S beam, and connected to the end face of the PC member. A pair of upper and lower flanges connected to the flange, an opening having a diameter substantially equal to the inner diameter of the PC member is formed at the center of the upper and lower flanges, and the diaphragm is interposed between the PC members; In this state, this P
In a method for constructing a column in which concrete is sequentially poured into a C member, a tubular body projecting upward by a predetermined height along a central opening of the diaphragm is fixed to an upper flange of the diaphragm, and the upper flange is fixed to the upper flange. When the upper PC member is placed on the upper surface, a grout agent is filled in a gap between the upper flange and the lower end of the PC member.

[0007]

According to the method of constructing a pillar of the present invention having the above-described structure, a tubular body protruding upward by a predetermined height along a central opening of the upper flange of a diaphragm interposed between PC members is provided. When the upper PC member is placed on the upper flange, the gap between the upper flange and the lower end of the PC member is filled with the grout agent. When the inside enters the inside of the PC member, the inside is blocked by the tubular body fixed along the central opening. Therefore, the grouting agent is P
It is possible to prevent intrusion into the entire area inside the C member.

Further, the tubular body fixed to the upper flange projects in a direction perpendicular to the flange surface and is buried in concrete to be cast later. A part of the input stress can be directly transmitted to the column side through the tubular body. For this reason, the joint strength between the RC column and the diaphragm is increased, so that the diaphragm can be made thinner and lighter.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show one embodiment of a method for constructing a pillar according to the present invention. FIG.
FIG. 4 is a plan view of a diaphragm.

That is, in the present embodiment, a mixed structure is adopted by connecting an S-shaped beam (not shown) to the RC column 10 and the column 10 has a hollow rectangular cross section. Are constructed by sequentially adding members 12, 12a... Upward. A diaphragm 14 for connecting an S beam is interposed between the PC members 12, 12a,.

The diaphragm 14 is provided with a tubular steel pipe 18 surrounding the outer periphery of a PC member 16 having the same diameter as the PC members 12, 12a. On a pair of rectangular shapes formed of steel plate,
The lower flanges 20, 22 are fixed. Upper and lower flange 2
Openings 20a, 22a having substantially the same diameter as the inner diameters of the PC members 12, 12a,.

In this embodiment, the diaphragm 1 is used.
A tubular body 24 projecting upward at a predetermined height h along the inner periphery of the opening 20a is fixed to the upper flange 20 by welding. The protrusion height h of the tubular body 24 is
It is determined according to the filling thickness of the grouting agent 28 described later.

When constructing the column 10, first, the lower flange 22 of the diaphragm 14 is placed on the upper surface of the lower PC member 12, and in this state, the opening 20 of the upper flange 20 is opened.
The concrete 26 is poured from the position a to the upper end position of the diaphragm 14. Next, the lower end of the upper PC member 12a is placed on the upper flange 20 of the diaphragm 14. At this time, the level is adjusted while slightly lowering the lower end of the PC member 12a, and the lower end of the lower PC member 12a is adjusted. It comes out to be horizontal. Then, by adjusting the level, the gap provided between the PC member 12a and the upper flange 20 is filled with the grout agent 28 to secure the integration thereof.

The upper PC member 12a
Although not shown, a diaphragm is placed in the same manner and concrete is cast on the upper end of the concrete, and this concrete is integrated with the concrete 26 cast on the PC member 12 below. The concrete cast on the PC members 12, 12a...
And integrated. The pillars 10 thus constructed are interposed at appropriate intervals (each floor height) with the diaphragms 14 interposed therebetween, and the S beams are connected to the diaphragms 14 after the cast concrete is hardened. Has become.

The column 10 constructed by the above-described method has an opening 20 formed on the upper flange 20 of the diaphragm 14.
When the grout 28 is filled in the gap between the upper flange 20 and the lower end of the upper PC member 12a, the grout penetrates into the gap because the tubular body 24 protrudes upward along the gap a. The agent 28 is blocked by the tubular body 24. Therefore, the PC member 12 is further removed from the tubular body 24.
a, it is possible to prevent the grouting agent 28 from intruding into the inner portion of the PC member 12a, so that the amount of the grouting agent 28 used can be reduced and the lower end of the PC member 12a and the upper flange 20 of the diaphragm 14 can be connected to each other. Properties can be significantly increased.

The tubular body 24 fixed to the upper flange 20 projects in a direction perpendicular to the surface of the flange 20 and is buried in concrete cast later.
A part of the stress input from the S-beam connected to the diaphragm 14 can be directly transmitted to the column 10 via the tubular body 24. For this reason, the joint strength between the RC column 10 and the diaphragm 14 is increased, so that the diaphragm 14 can be made thinner and lighter.

[0017]

As described above, in the method of constructing a pillar according to the present invention, the upper flange of the diaphragm interposed between the PC members is provided with a predetermined height upward along the center opening thereof. When the upper PC member is placed on the upper flange, the gap between the upper flange and the lower end of the PC member is filled with a grout agent. Grouting agent is P
When it enters the inside of the C member, it can be blocked by the tubular body. Therefore, it is possible to prevent the grout agent from entering the entire inner region of the PC member, thereby reducing the amount of the grout agent used, and to secure a high connection between the lower end of the PC member and the upper flange of the diaphragm. it can.

Further, the tubular body fixed to the upper flange projects in a direction perpendicular to the flange surface and is buried in concrete to be cast later. A part of the input stress can be directly transmitted to the column side through the tubular body. For this reason, the bonding strength between the RC column and the diaphragm is increased, and various excellent effects such as reduction in thickness and weight of the diaphragm are achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a column showing one embodiment of the present invention.

FIG. 2 is a plan view of a diaphragm used in one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing a conventional pillar structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Column 12, 12a PC member 14 Diaphragm 18 Tubular steel pipe part 20 Upper flange 22 Lower flange 24 Tubular body 26 Concrete 28 Grout agent

Claims (1)

(57) [Claims] 1. A mixed structure for constructing RC columns by sequentially adding tubular PC members while interposing a diaphragm for connecting S beams, wherein the diaphragm is a web of S beams. And a pair of upper and lower flanges which are fixed to the upper and lower ends of the tubular steel pipe, are connected to the end face of the PC member, and are connected to the flange of the S beam, An opening having substantially the same diameter as the inner diameter of the PC member is formed at the center of the upper and lower flanges.
In a method of constructing a column in which concrete is sequentially poured into a C member, a tubular body projecting upward at a predetermined height along a central opening of the diaphragm is fixed to an upper flange of the diaphragm, and the upper flange is fixed to the upper flange. A method of constructing a pillar, characterized in that a gap between the upper flange and the lower end of the PC member is filled with a grout agent when the upper PC member is placed on the column.