JPH0376384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing columns in reinforced concrete structures.

(Prior Art) and (Problems to be Solved by the Invention) Various construction methods have been developed for prefabricated reinforced concrete frames, but each member generally weighs a lot and requires a large lifting machine.

In addition, as a way to reduce weight, members that double as formwork have been developed in which a part of the cross section is precast, but members with open cross sections, such as slab plates and channel beam members, are relatively easy to manufacture. On the other hand, it has been difficult to manufacture closed cross-section members with a hollow center, such as pillar members.

(Means for Solving the Problems) The present invention was proposed in order to solve these problems, and includes a part of the main column reinforcement and a tie bar surrounding the main reinforcement in the frame, and A plurality of groove-shaped or L-shaped precast concrete members, which are formed by bending the protruding ends of the tie bars from the frame flange portions into hook shapes, allow the hook-shaped portions of each tie bar of adjacent members to intersect. After assembling the rectangular cross-sectional members as shown in FIG. This relates to a method of constructing reinforced concrete columns characterized by the following.

(Function) In the present invention, a groove-shaped or L-shaped precast concrete member is made in advance by dividing a reinforced concrete column with a square cross section into 1/2 or 1/4, and the main reinforcement of the column and the main reinforcement of the column are attached to the same member. It has a built-in surrounding tie reinforcement, and the protruding end of the tie reinforcement from the end of the member flange portion is bent into a hook shape, and the groove-shaped or L-shaped precast concrete member is used to form a rectangular section. While assembling the members, the hooks of the protruding ends of the stirrups of the adjacent precast concrete members were made to intersect, and the column main reinforcement was inserted into the intersection, so that the tie reinforcements were The reinforcing bars of the reinforced concrete column are firmly set in place.

Then, by pouring post-cast concrete into the central hollow part of the rectangular cross-section member formed by each of the precast concrete members, and integrating the poured concrete with each of the precast concrete members. , consisting of reinforced concrete columns.

(Effects of the Invention) According to the present invention, a column outer frame member with a square cross section is assembled using the groove-shaped or L-shaped precast concrete members manufactured in advance, and each of the precast concrete members is used as a formwork. Post-cast concrete is poured into the internal cavity, and a reinforced concrete column is constructed in which the poured concrete and each of the above-mentioned precast concrete members are integrated, so construction is easy, and Since the cast concrete member is formed into a groove-shaped or L-shaped cross section with a divided rectangular cross section, it is lightweight, does not require a large lifting machine, and construction is simplified.

Each of the precast concrete members has a built-in part of the column main reinforcement and a tie bar surrounding the column main reinforcement, and the end protrusion of the member flange of the tie bar is bent into a hook shape, and the precast concrete member When assembling cast concrete members, the hook-shaped parts intersect, and the column main reinforcement is inserted through this intersection, so the stirrup is restrained by the thick action of the column main reinforcement, and the string is composed of the column main reinforcement and the tie reinforcement. The reinforced concrete columns are constructed with reinforced concrete columns that are firmly placed in the specified positions and have structural reliability.

In addition, in the conventional construction method, there was a difficulty in the joint between the precast column and the shear wall, but in the present invention, the flange portion of the precast concrete member is made shorter by the thickness of the shear wall, and the distance between the adjacent flange portions is reduced by the thickness of the shear wall. By integrating the end of the shear wall and the post-cast column concrete part, it is possible to construct a structurally reliable joint between the shear wall and the column.

(Example) The present invention will be described below with reference to the illustrated embodiments.

A is a groove-shaped precast concrete member made by dividing a rectangular member with a cavity in the center of a reinforced concrete column into 1/2, and a part of the column main reinforcement 1 and the band reinforcement 2 surrounding the column main reinforcement 1 are buried in advance. , a protrusion from the end of the flange portion of the member A in the strap 2 is bent at 90 degrees to form a hook-shaped portion 2a. (See Figure 1) Then, the hook-shaped portion 2 of the tie reinforcement 2 facing the pair of groove-shaped precast concrete members A, A
It is assembled into a rectangular frame shape so that the hook-shaped portions 2a intersect, and the main column reinforcements 1' are inserted through the intersections of the hook-shaped portions 2a, and the straps 2 are restrained by the main column reinforcements 1'.

Thereafter, post-cast concrete B is placed between the two pre-cast concrete members A, and the post-cast concrete B and each of the pre-cast concrete members A are integrated to construct a reinforced concrete column. (See Figure 2) Figure 3 shows a case where shear walls are installed on both sides of a reinforced concrete column. In this case, each flange of both precast concrete members A is shortened by the thickness of the shear wall C. This is intended to integrate the shear wall C and the post-cast concrete B.

FIG. 4 shows a case where shear walls C are attached to a reinforced concrete column in four directions, and in this case, an L-shaped precast concrete member A' is used.

Note that the precast concrete member A,
As shown in Fig. 5, a splice sleeve 3 is attached to the base of the column main reinforcement 1 built in A', and the upper and lower precast concrete members A and A' are connected through the sleeve 3. The main column reinforcement 1 is to be joined.

In Fig. 5, 1a is the protruding end D of the main column reinforcement 1 in the concrete members A and A', and E is the beam.
is a slab.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a slope view of a channel-type precast concrete member used in the method of the present invention, FIGS. 2 to 4 are cross-sectional plan views of reinforced concrete columns constructed by the method of the present invention, and FIG. The figure is an elevation view. A, A'... Precast concrete members,
B...Post-cast concrete, 1,1'...Column main reinforcement,
2... Strap, 2a... Hook-shaped part.

Claims (1)

[Claims] 1. A plurality of grooves or L-shapes in which a part of the column main reinforcement and a tie bar surrounding the main bar are built into the frame, and the end of the tie bar protruding from the frame flange is bent into a hook shape. After assembling a rectangular cross-section member using precast concrete members so that the hook-shaped parts of each of the tie bars of adjacent members intersect, and inserting the main column reinforcement into the intersection of the hook-shaped parts of the ties, A method for constructing a reinforced concrete column, characterized in that post-cast concrete is integrally poured into each of the groove-shaped or L-shaped precast concrete members.