JPH0531622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a precast reinforced concrete column in consideration of column-beam joints in reinforced concrete structures and steel-framed reinforced concrete structures.

《Prior Art》 Conventionally, as a structure of this type of precast reinforced concrete column, the one proposed in Japanese Patent Publication No. 45-18546 was proposed, especially considering the joint between the precast reinforced concrete column and the steel beam. Are known. In this proposal, steel caps are attached to the capitals or bases of precast reinforced concrete columns, and the columns are separated for each floor so that the steel beams penetrate the columns at the column-beam joints. The joint between the precast reinforced concrete column and the steel beam was constructed by joining the flange surface of the beam via a steel cap.

<<Problems to be Solved by the Invention>> However, in the case of the above-mentioned conventional precast reinforced concrete column, the precast reinforced concrete column and the steel beam, which are formed separately in advance, are combined and connected at their joints, and then integrated afterwards. Because it is a structure in which the columns and beams are integrated, it is no more than a simple joining of separate members, and it is not possible to achieve an integral continuity of the structure that includes the joints of the columns and beams. It was sufficient. In particular, since the structure is such that the columns and beams, which have been formed separately, are joined together at the column-beam joint where the maximum stress occurs, Depending on the joining means used, the structure may pose problems in structural strength.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to create a mixed structure of precast reinforced concrete columns and steel beams, while ensuring further structural integration.・
The beam joints are constructed with complete structural continuity,
To provide a precast reinforced concrete column that can constitute a continuous and integrated mixed structure extending from the lower floor column to the upper floor column via the column-beam joint, extending over the upper and lower floors.

<Means for Solving the Problems> In order to achieve the above object, the precast reinforced concrete column of the present invention has a column-beam joint located between the upper and lower floors and a column extending horizontally from this. For a steel beam that has an extension part and has a hollow hole vertically penetrating the column-beam joint, the steel beam extends vertically between the upper and lower floors. A cylindrical body constructed by integrally incorporating the main column reinforcement that surrounds the column-beam joint part and the hoop reinforcement to be attached to this, and a hollow cylindrical column that is continuous across the upper and lower floors. Concrete material is poured into the cylinder excluding the hollow hole to form a concrete material, and other concrete material is formed to protrude from the upper and lower ends of the pillar body and is connected from above and below. It is characterized by comprising a joint portion for temporarily fixing the column body.

<<Function>> To describe the function of the present invention, when constructing the column part and beam part spanning the upper and lower floors including the column-beam joint in a mixed structure of steel beams and reinforced concrete columns, the column of the reinforced concrete column is Main bars, hoop bars, and steel beams are integrated into a cylinder to form a cylinder, and concrete is poured into the cylinder except for the hollow holes to create a continuous hollow cylinder that spans the upper and lower floors. The structure is a mixture of reinforced concrete columns and steel beams.
Further structural integration can be ensured, and the entire structure including the column-beam joint can be structurally completely continuous, and the column main reinforcement and steel beam can also be connected at the column-beam joint. Integration can be ensured through direct combination with
It is possible to create a continuous and integrated mixed structure from the pillars on the lower floor to the columns on the upper floor via the column-beam joints.

In addition, by forming a joint part that protrudes from both the upper and lower ends of the column and temporarily fixes another column to be connected from the top and bottom, it is possible to temporarily fix the columns to be connected to each other. This makes it possible to improve the workability of connecting the columns, which are equipped with beams and are difficult to balance during connection work.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1a is a cross-sectional view of the precast reinforced concrete column 1 of the present invention from the beam part, Figure 1b is a vertical cross-section of the column 1 slightly shifted from the center of the column, and Figure 1c is a cross-sectional view of the column 1. As can be understood from the figure, its structure is as follows. In other words, this embodiment basically has a column-beam joint placed between the upper and lower floors, and an extension extending horizontally from this, and a column-beam joint that extends vertically. For the steel beam 5 in which a penetrating hollow hole 8 is formed, the main column reinforcement 3 extends vertically between the upper and lower floors and surrounds the column-beam joint portion of the steel beam 5, and is attached thereto. Hoop muscle to be done 2
Concrete is poured onto the cylinder excluding the hollow holes 8 to form a continuous hollow cylinder-shaped column 1 spanning the upper and lower floors. 7, and a joint member 6, which is formed to protrude from both the upper and lower ends of the column 1 and serves as a joint portion for temporarily fixing another column connected from the vertical direction. Ru.

Hollow part 4 in the axial direction between hoop reinforcement 2 and column main reinforcement 3
A cylindrical body with a prismatic external shape is assembled, a steel beam 5 made of H-beam steel is integrated horizontally in the central part, and plate-shaped joint members 6 are provided protruding from both the upper and lower ends to form a concrete material 7. It is cast into a cylindrical shape.

The steel beam 5 has a flange 5a- which forms the upper side and the lower side.
5a and the web 5b in the axial direction of the hollow portion 4. Concrete material 7 is steel beam 5
The outer periphery of the hollow hole 8 is filled and cast at the joint portion where the two are perpendicular to each other. Mesh wire gauze is used for the inner wall surfaces of the hollow portion 4 and the hollow hole 8.

According to the above configuration, when constructing the column part and beam part spanning the upper and lower floors including the column-beam joint in a mixed structure of the steel beam 5 and the reinforced concrete column 1, the reinforced concrete column 1 is The main column reinforcements 3, hoop reinforcements 2, and steel beams 5 are integrally assembled to form a cylindrical body, and concrete material 7 is poured into the cylindrical body except for the hollow holes 8, and the upper and lower floors are constructed. Since a continuous hollow cylindrical column 1 is formed, although it is a mixed structure of reinforced concrete columns 1 and steel beams 5, it is not possible to integrate them later by joining means at the column-beam joint like in the past. It is possible to ensure further structural integration than by merging, and the entire structure including the column-beam joints can be made into a structure with complete structural continuity. In addition, unlike conventional structures in which columns and beams, which are formed separately, are joined together at the column-beam joint where the maximum stress occurs, the columns and beams are・Even at the beam joint, integration can be ensured by direct combination of the main column reinforcement 3 and the steel beam 5, resulting in
It is possible to create a continuous and integrated mixed structure from the pillars on the lower floor to the columns on the upper floor via the column-beam joints.

The precast reinforced concrete column 1 thus obtained is used, for example, as shown in FIGS. 2 and 3. All precast reinforced concrete columns 1
(hereinafter simply referred to as PC columns) are connected vertically, and the lower PC column 1a has a floor slab 9 installed on its steel beam 5. The upper PC column 1b is suspended from the upper end of the lower PC column 1a by a crane or the like, and the vertical connecting main reinforcement 10 and the auxiliary hoop reinforcement 11, which are fitted in the axial direction within the mutually assembled hollow parts 4, are placed at the planned locations. After connecting and fixing the joint parts 6 of each other by bolts, welding, etc., both the upper and lower PC columns 1a-1b
The formwork 12 is applied to the outer peripheral surface of the adjacent joint, and then post-cast concrete is cast and filled into the hollow portion 4 and the hollow hole 8. After curing of the post-cast concrete is completed, the formwork 12 is removed.

The PC pillars 1a-1b in FIG. 3 have an inner part protruding upward at the upper end of the pillar, and a joint part formed by protruding the peripheral edge part downward at the lower end of the pillar. The main reinforcement 3 is extended and projected upward, and the vertical connection main reinforcement 10 is connected to this extended portion 13.
It also serves as The extended portion 13 of the lower PC column 1a is inserted into the lower part of the hollow portion 4 of the upper PC column 1b, and the upper and lower PC columns 1a and 1b are stacked vertically, and post-cast concrete is poured from above into the hollow portion 4. And the hollow hole 8 is cast and filled.

In particular, by forming a joint part that protrudes from both the upper and lower ends of the column and temporarily fixes another column to be connected from above and below, the columns to be connected can be temporarily fixed to each other. This makes it possible to improve the workability of connecting the columns, which are equipped with beams and are difficult to balance during connection work. Further, in the present embodiment, in any case, the main reinforcements are formed into a lap joint by the column main reinforcement 3 and the connecting main reinforcement 10 or the extended portion 13, and are extremely strongly connected. In addition, the joint portion of the steel beam 5 is also integrally fixed to the column main reinforcement 3 by means such as welding, and concrete is cast and filled into the hollow hole 8 integrally with the hollow portion 4 in the PC column 1. Therefore, the strength of the column-beam joint is maintained sufficiently.

<<Effects>> As described in detail above, according to the precast reinforced concrete column of the present invention, in a mixed structure of a steel beam and a reinforced concrete column, the column part and the beam part spanning the upper and lower floors, including the column-beam joint, When constructing a reinforced concrete column, the main reinforcement and hoop reinforcement of a reinforced concrete column and a steel beam are integrated to form a cylinder, and concrete is poured into this cylinder except for the hollow holes, and the upper and lower By forming continuous hollow cylindrical columns across the floors, the building has a mixed structure of reinforced concrete columns and steel beams.
It is possible to ensure further structural integration than conventional post-integration using joining methods at column-beam joints, and it is possible to achieve complete structural continuity of the entire structure, including column-beam joints. can have a certain structure, and also,
Unlike conventional structures in which columns and beams, which are formed separately, are joined together at the location where the maximum stress occurs, the columns and beams are Even at joints, we are able to ensure integration by directly combining the main column reinforcement and steel beams, and as a result, the columns on the lower floor, which span the upper and lower floors, connect to the upper floor via the column-beam joint. It can be a continuous and integral mixed structure up to the pillars.

In addition, by forming a joint part that protrudes from both the upper and lower ends of the column and temporarily fixes another column to be connected from the vertical direction, it is possible to temporarily fix the columns to be connected to each other. This makes it possible to improve the workability of connecting the columns, which are equipped with beams and are difficult to balance during connection work.

[Brief explanation of the drawing]

Figure 1a is a cross-sectional view of the beam part of the PC column, Figure 1b
is a cross-sectional view taken along line C-C, and c is a cross-sectional view taken along line B-B.
2 is a schematic longitudinal sectional view showing a connection example, and FIG. 3 is a schematic longitudinal sectional view showing another connection example. 1... Precast reinforced concrete column, 2...
…Hoop reinforcement, 3…Column main reinforcement, 4…Hollow part, 5
... Steel beam, 6 ... Joint member, 7 ... Concrete material, 8 ... Hollow hole, 9 ... Floor slab, 1
0...Vertical connection main reinforcement, 11...Auxiliary hoop reinforcement, 12
...Formwork, 13...extension part.

Claims (1)

[Scope of Claims] 1. It has a column-beam joint part arranged between the upper and lower floors and an extension part extending from this in the horizontal direction,
In addition, for a steel beam having a hollow hole vertically penetrating through the column-beam joint, the steel beam extends vertically between the upper and lower floors, and the column-beam joint of the steel beam A cylindrical body constructed by integrally incorporating the column main reinforcement surrounding the main column reinforcement and the hoop reinforcement to be attached to this, and the above-mentioned cylinder to form a continuous hollow cylindrical Katsura body spanning the upper and lower floors. Temporarily fix the concrete material that will be placed on the body except for the hollow hole, and other columns that will be formed to protrude from this at both the upper and lower ends of the column and will be connected from the top and bottom. A precast reinforced concrete column characterized by having a joint part and.