JPH01210536A - Construction of reinforced concrete structure body - Google Patents

Abstract

PURPOSE:To facilitate easy manufacture, transportation, handling and building, by employing a precast concrete member made by connecting a pair of concrete main beam members facing each other, and a beam reinforcing bar basket which intersects the precast concrete member. CONSTITUTION:A precast concrete member 10, with stirrups 18 protruding over the surface of the precast concrete member 10, is composed of a pair of main beam members 12, which are laid facing each other at a given space and connected each other with at least two bottom reinforcements 14 and 16, piercing through the lower part of the beam members. A reinforcing bar basket 20 with at least one bottom reinforcement 26 is made as a beam member, which is to intersect the precast concrete member 10. Then, the precast concrete member 10 is installed in a way that the main beam members 12 are placed over a column 32. After the reinforcing bar basket 20 is fitted, crossing the precast concrete member 10, molds are erected at required places and concrete is placed therein to build a concrete structure body.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for constructing a reinforced concrete structure, and in particular, the present invention relates to a method for constructing a reinforced concrete structure, and in particular, to a method for constructing a reinforced concrete structure in which the main reinforcing bars at the lower end of a beam or the reinforced concrete arranged in multiple stages are used. Concerning methods of constructing structures.

(Prior art) When the stress generated in the beam is large, such as when the reinforced concrete structure to be constructed is high-rise or the span of the beam in the structure is long, the main reinforcing bars at the lower end of the beam are arranged in multiple stages. Ru.

One of the construction methods for reinforced concrete structures equipped with such beams is to form a reinforced concrete structure in which the main reinforcing bars at the lower end are arranged in multiple stages, and after placing the stiffness in the predetermined position,
Some methods involve placing beam formwork and pouring concrete into the space defined by the formwork. The reinforcing bar cage used in this method is assembled in two directions, that is, in a cross, T-shape, or L-shape when viewed from above. However, in the above method, all the beams are formed of cast-in-place concrete, so
There are problems in trying to save labor and improve quality in construction.

In order to solve the above problem, there is a method in which a part of the beam including the column-beam intersection, so-called panel zone, is made of a precast member (Japanese Patent Laid-Open No. 62-6034). This method contributes to labor-saving and high quality construction by making the panel zone, which includes a part of the beam and has intertwined reinforcing bars, into a precast concrete member. This makes manufacturing and transportation of precast concrete members difficult. The connection position of the reinforcing bars on the beam is preferably at the center of the span from the viewpoint of reducing the number of connections and stress generated in the culvert. However, if the reinforcing bars on the beams of the precast concrete members are extended to the center of the span, transportation becomes increasingly difficult and the weight increases, so large mechanical equipment is required to lift the precast concrete members. It is uneconomical.

(Problems to be Solved by the Invention) The present invention promotes prefabrication by using precast concrete members that are easy to manufacture, transport, and handle, and also rationally arranges lower end main reinforcing bars that intersect with each other in multiple stages. The purpose of the present invention is to provide a method for constructing a reinforced concrete structure that can be placed.

(Means for Solving the Problems) The method for constructing a reinforced concrete structure of the present invention is such that a pair of concrete beam main bodies are spaced apart from each other so that their end faces face each other, and both beam main bodies are connected to each other. At least two lower end reinforcements located at the lower part of the beam main body and extending through portions separated in the height direction of the beam main body so as to be connected, and an upper end portion protruding upward from the beam main body. A precast concrete member including a plurality of stirrup bars having , a reinforcing bar cage having at least one bottom end reinforcement is disposed above the column main body so as to intersect with the precast concrete member; Pass another lower end reinforcement through the curved reinforcing bar cage so as to pass between the lower end reinforcements, and then or before this, extend an upper end reinforcement for a beam in the precast concrete member in parallel with the lower end reinforcement of the precast concrete member. The method includes arranging the reinforcing bars of the precast concrete member and the reinforcing bars of the rebar cage so that they intersect with each other.

(Operation and Effect of the Invention) The precast concrete member used in the present invention has a one-character shape, that is, one direction, including a pair of reinforced concrete beam main parts connected at intervals by lower end reinforcements so that the end faces face each other. Since it has a structure that extends only in one direction, it is easier to manufacture and transport than a conventional precast concrete member that extends in two directions.

The reinforcing bars used to form the beams intersecting the precast concrete members are placed in predetermined positions as reinforcing bar cages. Therefore, a beam having multiple levels of intersecting lower end reinforcements can be formed by simply arranging lower end reinforcements that extend between the lower end reinforcements of the precast concrete members in a direction that intersects with the lower end reinforcements.

(Example) Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 shows a precast concrete member 1 of the present invention.
0 is shown. Precast concrete member 10
includes a pair of beam main parts 12 made of reinforced concrete that act as beams in a reinforced concrete structure.

The beam main body parts 12 are arranged at intervals so that their end surfaces face each other, and a plurality of lower end reinforcements 14 for the beam are arranged.
．． They are interconnected by 16. Each lower end reinforcement 14.1
6 extends through parts located at the lower part of the business body part 12 and separated from each other in the width direction of the business body part 12. The lower end reinforcement 14 is arranged below the lower end reinforcement 16.

The main body part 12 is provided with a plurality of stirrup bars 18 that interconnect reinforcing bars for beams. Each stirrup muscle 1
The upper end portion of 8 projects upward from the concrete portion of the business body portion 12.

FIG. 2 shows a beam reinforcing bar 1120 used with the precast concrete member 10 during construction of a reinforced concrete structure. When the reinforcing bar cage 20 is formed as a beam of a constructed structure, the reinforcing bar cage 20 includes a plurality of upper end reinforcements 22 and 24 extending in parallel at parts separated in the width direction of the beam at the upper part of the beam. A plurality of lower end reinforcements 26 extending in parallel at the lower end of the beam and separated in the width direction of the beam.
and a plurality of stirrup muscles 28 that interconnect the upper end reinforcements 22, 24 and the lower end reinforcements 26. stirrup muscle 28
The dimensions are approximately the same as those of the stirrup bars 18 of the precast concrete member 10. In addition, reinforcing bar cage 20
The upper end reinforcement 22 or 24 may not be provided.

Next, the construction method of the present invention will be explained with reference to FIG.

As shown in FIG. 3(A), on the floor top surface 30 of the lower floor,
A plurality of pillars 32 are erected at predetermined intervals. The column 32 is provided with a plurality of column main reinforcements 34 extending in the vertical direction and a plurality of hoop reinforcements (not shown) that interconnect the column main reinforcements. The upper end of the company main reinforcement 34 is attached to the pillar 32 so that the height position of the upper end is above the height position of the beam.
It is protruded from.

In the precast concrete member 10, as shown in FIG.
Further, the end of the opposite end surface of the business body part 12 is connected to the pillar 30.
It is placed by means such as a crane so that it is placed on the When the precast concrete member 10 is placed on the column 32, the main column reinforcement 34 of the column 32 extends upward between the main body parts 12. A plurality of spacers 36 are arranged in advance between the business body part 12 and the pillar 32 to form a gap therebetween.

Next, as shown in FIG. 3(B), the reinforcing bar cage 20 is attached to the pillar 3.
0, extending between the business body parts 12 in a direction intersecting the precast concrete member 10, and arranged by means such as a crane so that the lower end reinforcement 26 contacts the lower end reinforcement 16 of the precast concrete member 10. At this time, it is desirable that the lower end reinforcing bars 38, which will be described later, be temporarily fixed to the lower part of the stirrup bars 28 of the reinforcing bars fi20, as shown in FIG. 3(B), and lifted to a predetermined position at the same time as the reinforcing bars H and 20.

In the state where the reinforcing bars 1i20 are arranged as shown in FIG. 3(B), the reinforcing bar cage 20 is supported by the lower end reinforcement 16 of the precast concrete member 10, and the main reinforcement 34 projects upward from the reinforcing bars M, 20. There is.

Next, as shown in FIG. 3(B), the lower end reinforcement 38 of the reinforcing bar cage 20 is located between the lower end of the stirrup reinforcement 28 and the lower end reinforcement 26, and the lower end reinforcement 1 of the precast concrete member 10 is placed between the lower end of the stirrup reinforcement 28 and the lower end reinforcement 26.
It is inserted between 4.16 and 4.16.

Next, as shown in FIG. 3(C), the upper end reinforcement 40 of the precast concrete member 10 is placed above the hoop reinforcement and inserted between the upper end reinforcements 22 and 24 of the reinforcing bars M and 20, and the upper end reinforcement 40 is inserted below the upper end reinforcement 40 and the upper end reinforcement 24 of the reinforcing bar cage 20. As a result, the precast concrete member 10 and the reinforcing bars 20 are combined as shown in FIG. 3(D).

In addition, the upper end reinforcement 40 of the precast concrete member 10
may be placed before placing the lower end reinforcing bars 38 of the reinforcing bar cage 20.

Next, the formwork defining the space for the floor slab, the main body part 1
2 and the column 32, a formwork that defines the space that interconnects adjacent precast concrete members 10, and a mold that defines the space in which the exposed reinforcing bars of the precast concrete members 10 are embedded. After the frame and the formwork defining the space for the beam extending in the direction intersecting the precast concrete member 10 are placed, concrete is poured into the space defined by the stiff formwork.

As a result, the cross-shaped beams, columns 32, and floor slab are integrally formed. After this, the next Ryokawa Pillar will be built on top of the newly constructed floor. The above steps are repeated as many times as there are floors of the structure to be built.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a precast concrete member used in the present invention, FIG. 2 is a perspective view showing an embodiment of a reinforcing bar cage for a beam used together with the precast concrete member shown in FIG. The figures are explanatory diagrams of the construction method of the present invention, and FIG.
B) is a diagram showing the state in which reinforcing bar cages are placed on columns, and Figure 3 (
C) is a diagram showing a state in which upper end reinforcements for a precast concrete member are placed, and FIG. 3(D) is a plan view showing a state in which all reinforcing bars for a beam have been placed. 10: Precast concrete member, 12: Main body of beam, 14.16: Lower end reinforcement of precast concrete member, 18.28 Nistarap reinforcement, 20: Rebar cage for beam, 22.24: Upper end reinforcement of reinforcing bar cage, 26.38 : Lower end reinforcement of reinforcing bar cage, 32: Column, 40.42: Upper end reinforcement of precast concrete member. Agent Patent Attorney Nobuyuki Matsunaga Figure 3 (A) Figure 3 (B) Figure 3 (C)

Claims (1)

[Claims] (1) A pair of concrete beam main bodies spaced apart so that their end faces face each other; A precast concrete member including at least two lower end reinforcements extending through portions separated in the height direction and a plurality of stirrup reinforcements having upper end portions projecting upwardly from the beam main body is placed between the beam main body. is arranged so as to be the upper part of the column main part of the structure, and a reinforcing bar cage having at least one lower end reinforcement for a beam extending in a direction intersecting with the precast concrete member is placed in the precast concrete above the column main part. pass another lower end reinforcement through the reinforcing bar cage so as to intersect with the member, and pass another lower end reinforcement under the lower end reinforcement of the reinforcing bar cage and between the lower end reinforcements of the precast concrete member; Prior to this step, the upper end reinforcement for a beam is arranged in the precast concrete member so as to extend parallel to the lower end reinforcement of the precast concrete member, and the reinforcing bars of the precast concrete member intersect with the reinforcing bars of the reinforcing bar cage. , methods of constructing reinforced concrete structures.