JPH02112547A - Structuring reinforced concrete column - Google Patents

Abstract

PURPOSE:To facilitate the arrangement of shear-resistant reinforcing bars by a method wherein some internal main reinforcement of column main reinforcements, other than corner main reinforcements, are arranged on the inside of the arrangement lines demarcated by the positions of the corner main reinforcements, and the internal main reinforcements are bound being surrounded by shear reinforcing bars. CONSTITUTION:Corner main reinforcements 2 are arranged at corners demarcating a square that is defining an internal shape of a precast concrete PC manufacturing member 1. Internal main reinforcements 3, other than the corner main reinforcements 2, are arranged on the inside of the arrangement square shape of the corner main reinforcements 2, and a space in a dimension larger than that equivalent to the outer diameter of a shear resistant reinforcing bar 4 is provided between the internal main reinforcements 3 and internal peripheral surface 1a of the PC manufacturing member 1. Each one of the two pairs of the main reinforcements 3, facing each other, is bound with tie-hoops made from the shear resistant reinforcing bars 4, in a way that they are surrounding the main reinforcements 3 from the outside. The PC manufacturing members 1 are then inserted and installed, surrounding the outside of the corner main reinforcements 2 and after this, concrete is placed to the inside of the PC manufacturing members 1.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves pouring concrete into a hollow cylindrical precast concrete member in which a column main reinforcement is arranged and which defines the outer shell of the column. This paper relates to a method for constructing reinforced concrete columns.

(Prior Art) Conventionally, as a proposal for constructing reinforced concrete columns (hereinafter referred to as RC columns) using precast concrete members (hereinafter referred to as 10 members), there was a proposal called "Outer body for constructing reinforced concrete columns" (Special Publication No. 61-1983). Publication No. 31261)
and ``Precast Concrete Member for Constructing Concrete Columns'' (Utility Model Application Publication No. 10190'9/1983). First, at the construction site, the main column reinforcement, and if necessary, shear reinforcing reinforcement such as hoop reinforcement or circular spiral hoop reinforcement are arranged to surround the main column reinforcement, and then the reinforcement is placed over the arranged main reinforcement of the column. In this way, 10 hollow cylindrical members are installed, and finally, concrete is poured inside the PC members to construct an RC column.

(Problem to be Solved by the Invention) By the way, the column main reinforcements 2 and 3 placed inside the 20 members 1 are hollow cylindrical PCs as shown in FIG.
It is generally arranged along the inner surface shape of the 0 member so as to be substantially in contact with the inner peripheral surface a of the member. Taking the illustrated PC0 member with a square cross section as an example, the main corner reinforcements 2 at the four corners that define the square shape of the inner surface define the overall arrangement outline of the column main reinforcements 2 and 3,
The center main reinforcements 3 other than the corner main reinforcements 2 are arranged along this arrangement outline so as to be in contact with the inner circumferential surface a of the PC0 member. This is basically the same regardless of the shape of the inner surface of the PC0 member. In other words, the central main reinforcement 3 is The main corner reinforcements 2 are arranged so as to fill the space between the main corner reinforcements 2 along the arrangement outline defined by the arrangement of the main corner reinforcements 2.

As shown in FIG. 6 or 7, for the arrangement of the column main reinforcements 2 and 3, tie bars, circular spiral hoops, etc. are placed around the center main reinforcements 3 from the outside in order to restrain them. When trying to arrange shear reinforcing bars, it was difficult to install them because the central main bar 3 and the inner circumferential surface a of the PC0 member were almost in close contact with each other.

(Means and operations for solving the problem) In a method of constructing an RC column by pouring concrete into a hollow cylindrical PC member in which a column main reinforcement is arranged inside and defines the outer shell of the column, When arranging column main reinforcements, some center main reinforcements other than these corner main reinforcements are placed inward from the placement outline of the corner main reinforcements that define the placement outline of the column main reinforcements. At the same time, RC columns are constructed by surrounding some of these central main reinforcements from the outside and placing shear reinforcing bars, and then surrounding the outside of the column main reinforcements and inserting and installing PC members. .

(Example) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a plan view of a hollow cylindrical PC0 member, which surrounds the outside of the main column reinforcement 2゜3 installed at the construction site to form the outer shell of the RC column. Acts as formwork.

In particular, in the present invention, the column main reinforcements 2 and 3 arranged in the PC member 1 fill the space between these corner main reinforcements 2 with respect to the corner main reinforcement positions 2 that define the arrangement outline of the column main reinforcements 2 and 3. The center main reinforcements 3 other than the corner main reinforcements 2 are arranged to be shifted inward from the arrangement outline, and are arranged at a slight distance from the inner circumferential surface 1a of the PC0 member. This slight interval is set approximately equal to the outer diameter of the shear reinforcing bars 4.

In this example, a PC0 member with a square cross section is exemplified, and the main corner reinforcements 2 are placed at corners that define the square shape of the inner surface of the PC0 member, and serve as a reference for the outer shape of the arrangement. , the central main reinforcement 3 is arranged inside the arrangement outline along the inner surface shape of the PC0 member. Thereby, the center main reinforcement 3 is configured to be separated from the inner circumferential surface 1a of the PC0 member by an appropriate distance. Shear reinforcing bars 4 such as tie bars and circular spiral hoops are arranged on the column main bars 2 and 3 constructed in this manner.

What is shown in Figure 1 is the central main reinforcement 3 on each opposing side.
This is an example in which tie reinforcements 4 are arranged so as to surround these center main reinforcements 3 from the outside as one set, and in the example shown in Fig. 2, all the center main reinforcements 3 are connected to P
It surrounds the C0 member from the outside along the inner circumferential surface 1a. In either example, central main reinforcement 3
Since a gap is secured between the inner circumferential surface 1a of the PC0 member and the outer diameter of the shear reinforcing bar 4, the PC0 The work of inserting and installing members can be performed smoothly.

Thereafter, by pouring concrete into the PC member 1, construction of the RC column is completed.

Since the RC column is constructed as described above, the shear reinforcing bars 4 can be easily and appropriately arranged within the PC member 1 serving as the formwork. In addition, the PC0 member can be easily inserted and installed after the main reinforcement 23 has been arranged, resulting in labor savings (1). In the embodiment, a case has been described in which the entire outside of the center main reinforcement 3 is surrounded by the shear reinforcing reinforcement 4, but depending on the state of the reinforcement of the main reinforcement 3, it may not be necessary to surround it.

3 to 5 show examples of reinforcement in the 20 members 1. In this embodiment, opposing center main reinforcements 3a, 3a are temporarily fixed 5 at the upper and lower ends of the 20 member 1. In this state, the hoop reinforcements 6 are arranged so as to pass through the outer periphery of the corner portion 2a and the inner periphery of the central main reinforcement 3a. In this way, as shown in FIG. 4, the tendency of the hoop muscle 6 to swell outward can be suppressed.

(Effects of the Invention) In summary, according to the present invention, the following excellent effects are achieved.

When arranging column main reinforcements, some center main reinforcements other than these corner main reinforcements are placed inward from the placement outline of the corner main reinforcements that define the placement outline of the column main reinforcements. By constructing the RC columns in this way, we were able to secure a reinforcement space for shear reinforcement between the inner circumferential surface of the 20 members and some central main reinforcements, and within the PC section that served as the formwork. Shear reinforcing bars can be easily and appropriately arranged, and
The 20 members can be easily inserted and installed after the column main reinforcement is arranged, and labor can be saved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a preferred embodiment of the present invention, FIG. 2 is a plan view showing another preferred embodiment of the present invention, and FIG. 3 is a PC
Fig. 4 is a plan view showing an example of reinforcing reinforcement in a member, Fig. 4 is a plan view illustrating the tendency of hoop reinforcement to swell, and Fig. 5 is a perspective view showing a state in which the central main reinforcement in a PC member is fixed inside. 6 and 7 are plan views showing conventional examples.

Claims (1)

[Claims] In the method of constructing a reinforced concrete column by pouring concrete into a hollow cylindrical precast concrete member in which the column main reinforcement is arranged inside and defines the outer shell of the column, when arranging the column main reinforcement, these Among the column main reinforcements, with respect to the corner main reinforcement positions that define the arrangement outline of the column main reinforcements, some center main reinforcements other than these corner main reinforcements are placed inward from the arrangement outline, and the central part of these part A method for constructing a reinforced concrete column, characterized in that shear reinforcing bars are arranged surrounding the main reinforcement from the outside, and then the precast concrete member is inserted and installed surrounding the main reinforcement of the column from the outside.