JP2000257153A - Column / beam joint structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify the joining of precast concrete column members and beam members, to make it possible to separate columns and slab concrete and to simultaneously construct two or more layers of frames. SOLUTION: A column member 1 has a solid cross section over its entire length,
At the joint position with the beam member 2, a steel frame member 3 and a joint bar 4 whose ends project toward the beam member 2 are buried, while the ends project toward the column member 1 near the ends of the beam member 2. And the lower main bar 2a and the upper main bar 2b of the beam member 2 are protruded from the end surface of the beam member 2 toward the column member 1, and both the steel members 3 and 5 of the column member 1 and the beam member 2 are separated. At the same time, the joint bar 4 is connected to the lower main bar 2a and the upper main bar 2b to join the column member 1 and the beam member 2 together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a column member and a beam member of precast concrete.

[0002]

2. Description of the Related Art As the population of construction workers decreases and the population ages, demands for labor saving and productivity improvement at construction sites and reduction of construction waste are increasing. -The method of constructing the beam frame from precast members is highly productive, which can save labor, resources, shorten the construction period, and improve the quality, and can greatly reduce the use of wooden formwork by reducing the formwork work. In this respect, it conforms to the above social requirements.

[0003] In many cases, the joint between the precast column member and the beam member is such that the ends of the beam member are placed on the column member, and the lower main bars of the beam member are connected to each other on the column member. This is performed by arranging the top main reinforcement and joint reinforcement through the top and placing concrete on the column member at the same time as the slab, but since many column main reinforcements protrude from the column member, it crosses the column main reinforcement. Since high-precision work is required to connect the beam main reinforcement and the joint reinforcement in the cross section of the column member, there is a high possibility that the quality of the joint is deteriorated, and this also hinders labor saving.

[0004] Even when the column member and the beam member are joined outside the cross section of the column member, in order to secure the proof stress at the beam end where the stress condition is most severe, the shear reinforcement is densely arranged or the lower end main reinforcement is provided. It is necessary to arrange both the upper reinforcement and the upper reinforcement in two steps, and the reinforcement is still crowded, so that the joint of the column member and the beam member is inevitably complicated.

A steel member is buried at the upper end of a column member as disclosed in Japanese Patent Application Laid-Open No. 6-49897, or a steel frame is provided at a joint of a column member having a hollow cross section with a beam member as disclosed in Japanese Patent Application Laid-Open No. 7-310368. If the members are arranged and the steel members buried in the beam members are joined to the steel members, the strength at the beam ends is secured by the steel members, so that it is possible to avoid congestion such as shear reinforcement, Although the main body of the beam member and the column member can be joined without the column main bar, the joint bar and the column main bar for connecting the beam main bar to each other at the joint are arranged at the site, and the column main bar is arranged on the column member. Since they cross each other, the problem that the reinforcing bars on the column members are crowded remains.

In Japanese Patent Application Laid-Open No. 6-49897, the end of a beam member is mounted on the top end of a column member, and the beam member is joined to the column member within the cross section of the column member. In addition to being able to separate the concrete of the column and the concrete of the slab which does not need high strength, the column members have two or more layers for the purpose of improving the construction efficiency, and the frame of two or more layers is used at the same time. It cannot be constructed.

In Japanese Unexamined Patent Publication No. Hei 7-310368, a formwork is arranged by using a blocking plate arranged in a cross section of a column member, and when the time of placing is different, the concrete of the inside of the column member and the slab are driven. Can be divided, but not easy. Further, since the column member is vertically divided at the position where the beam member is erected, it is difficult to make the column member have a length of two or more layers.

In view of the above background, the present invention proposes a joint structure that simplifies joining of a column member and a beam member of precast concrete, and that enables concrete to be divided and construction of two or more layers.

[0009]

According to the present invention, a column member is formed into a solid cross section over its entire length, and the column member is joined to a beam member at a joint position.
While burying steel members and joint bars whose ends project from the surface of the concrete to the beam member side, near the end of the beam member,
A steel member whose end protrudes from the end face of the concrete to the column member side is buried, and the lower main reinforcement and the upper main reinforcement of the beam member are protruded from the concrete end surface to the column member side, and both the column member and the beam member are By connecting steel members, connecting the joint reinforcement with the lower and upper main reinforcements and joining the column and beam members, the joining is simplified, the concrete separation of columns and slabs and the construction of two or more layers of frames Enables simultaneous construction.

The main reinforcement and the hoop are buried in the concrete of the column member, and the lower main reinforcement and the lower part of the stirrup are buried in the concrete of the beam member. The column member is a solid section,
The joint bars connected to the main bars and hoops and the lower and upper main bars of the beam are buried in the column members, so there is no on-site reinforcement in the cross section of the column members, and interference with the column main bars Complex work of arranging beam main reinforcement while avoiding
The quality of the joint is kept constant.

The connection between the column member and the beam member is performed by connecting the joint bar to the lower main bar and the upper main bar, and also by connecting the steel members embedded therein, and the steel members ensure the strength of the joint. In order to secure the strength of the joint, it is necessary to arrange the stirrup densely around the lower and upper main bars of the beam, and it is not necessary to arrange the lower and upper main bars in two steps. Even at severe beam ends, congestion of reinforcing bars is avoided.

Further, the steel frame member is disposed on the column member and the beam member, and the steel frame member penetrates the column member and is disposed across the beam member by connecting the two steel frame members. Is made of SRC, so that the toughness is improved.

When the connection between the steel members of both the column member and the beam member and the connection between the joint bar and the lower and upper main bars are completed, the beam member is completely supported by the column member. It is not necessary to place a support under the beam member when placing the slab in concrete.

Further, since the column member has a solid cross section over the entire length, the concrete filling of the column has been completed in advance, so that only the concrete around the joints of the two steel frame members and the slab are cast on site. As a result, the concrete of the column and the concrete of the slab are separated and the concrete strength of the column and the concrete strength of the slab can be freely changed.

Since the beam member is joined to the column member on the outer peripheral side, it is not always necessary to divide the column member at the joint position. Therefore, the column member is given a length over a plurality of layers. This makes it possible to simultaneously construct two or more frames.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a precast concrete column member 1 manufactured by embedding a main reinforcement 1a and a hoop 1b in a concrete 1c, a lower main reinforcement 2a and a stirrup 2c.
The lower part is a joint structure with a precast concrete beam member 2 manufactured by being buried in concrete 2d.

As shown in FIGS. 1 and 2, the column member 1 has a solid cross section over its entire length, and its end protrudes from the surface of the concrete 1c toward the beam member 2 at the joint position with the beam member 2. In this state, the lower main bar 2a and the upper main bar 2b of the steel member 3, the beam member 2,
Is buried.

The steel member 3 is located at an intermediate height between the lower main bar 2a and the upper main bar 2b of the beam member 2 when the beam member 2 is erected between the column members 1 and 1. Is the lower main bar 2a
And the upper main bar 2b. In the drawings, the H-shaped steel is used for the steel frame member 3 and a steel frame member 5 described later, but the types and cross-sectional shapes of the steel frame members 3 and 5 are not limited.

In the concrete 2d near the end of the beam member 2, the concrete member 2d abuts against the steel member 3 embedded in the column member 1,
The steel member 5 to be connected is embedded. The end of the steel member 5 protrudes from the end face of the concrete 2d toward the column member 1, and the lower main bar 2a and the upper main bar 2b also protrude from the end surface of the concrete 2d of the beam member 2 toward the column member 1. The steel member 5 is located at the same height as the steel member 3 when the beam member 2 is erected.

The upper main bar 2b is attached to the beam member 2 in advance by being tied to the stirrup 2c or the like, and is arranged by erection of the beam member 2, or is arranged after the erection of the beam member 2.
The column member 1 and the beam member 2 are connected to both the steel members 3 and 5, and the lower joint bar 4 and the lower main bar 2a, and the upper joint bar 4 and the upper main bar 2b are connected to each other. The concrete 6 is joined by being poured around 5.

As shown in the figure, the steel members 3 and 5 pass over a splice plate 7 extending between them and are connected by bolting or welding, etc., so that the joint bar 4 and the lower main bar are connected.
The upper main bar 2a and the upper main bar 2b are connected by a mechanical joint using a splice sleeve 8, a coupler, or the like, pressure welding, or the like.

After the connection of the steel members 3 and 5 and the connection of the joint bar 4 with the lower main bar 2a and the upper main bar 2b or in parallel with the connection, the joint bars 4 and 4 projecting from the concrete 1c of the column member 1 are connected. A stirrup 9 is arranged around the lower main bar 2a and the upper main bar 2b projecting from the concrete 2d of the beam member 2.

The concrete 6 is assembled after assembling a formwork so as to surround the stirrup 9 and laying a floor formwork on the concrete 2d of the beam member 2. The floor formwork may be a formwork / floor slab, such as a thin precast concrete slab.

The upper end of the main bar 1a of the column member 1 is made of concrete.
A sleeve protruding from the top end of 1c necessary for connection with the main reinforcement 1a of the column member 1 on the upper floor side, and a sleeve into which the upper end of the main reinforcement 1a of the column member 1 on the lower floor side is inserted into the lower end portion of the concrete 1c. 1d is buried, and the main bar 1a is connected to the sleeve 1d.

The pillar member 1 on the upper floor is dropped on the pillar member 1 on the lower floor as shown in FIG. 1, the main bar 1a of the pillar member on the lower floor is inserted into the sleeve 1d, and is inserted into the sleeve 1d. By filling with mortar or the like, it is joined to the column member 1 on the lower floor side.

[0026]

The column member has a solid cross section over its entire length, and the main bar and the hoop and the joint bar connected to the lower main bar and the upper main bar of the beam are embedded in the column member. There is no in-site reinforcement at the site, and the complicated work of arranging the beam reinforcement while avoiding interference with the column reinforcement is eliminated, and the quality of the joint can be kept constant.

The connection between the column member and the beam member is performed by connecting the joint bars to the lower main bar and the upper main bar, and by connecting the steel members embedded therein, and the steel members ensure the strength of the joint. In order to secure the strength of the joint, it is necessary to arrange the stirrup densely around the lower and upper main bars of the beam, and it is not necessary to arrange the lower and upper main bars in two steps. Even at severe beam ends, congestion of reinforcing bars is avoided.

Further, the steel frame member is embedded in the column member and the beam member, and the steel frame member penetrates the column member and is disposed between the beam members by connecting the two steel frame members. Is made of SRC, so that the toughness is improved.

When the connection between the steel members of the column member and the beam member and the connection between the joint bar and the lower and upper main bars are completed, the beam member is completely supported by the column member. It is not always necessary to place a support under the beam member at the time of placing concrete, and the number of temporary members is reduced.

Since the pillar member has a solid cross section over the entire length, the concrete filling of the pillar has been completed in advance.
The concrete of the pillar and the concrete of the slab are separated by simply placing the joint and the concrete of the slab on site, and the concrete strength of the pillar and the concrete strength of the slab can be freely changed.

Since the beam member is joined on the outer peripheral side of the column member, and it is not necessary to divide the column member at the joint position, the column member is provided with a length extending over a plurality of layers, whereby a frame having two or more layers is provided. Can be constructed simultaneously.

[Brief description of the drawings]

FIG. 1 is an elevation view showing a state of joining a column member and a beam member.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

1 ... pillar member, 1a ... main bar, 1b ... hoop, 1c ... concrete, 1d ... sleeve, 2 ... beam member, 2a ... bottom main bar, 2b ... top main bar, 2c ... stirrup, 2d: concrete, 3: steel member, 4: joint bar, 5: steel member, 6: concrete, 7: splice plate, 8: splice sleeve, 9: stirrup.

Claims (1)

[Claims] 1. A precast concrete column member manufactured by embedding main bars and hoops in concrete;
The joint structure between the lower main bar and the lower part of the stirrup is buried in concrete, and is a joint structure with a precast concrete beam member. The column member has a solid cross section over the entire length, and the joint position with the beam member. A steel member and a joint bar whose ends protrude from the surface of the concrete toward the beam member are embedded, and a steel member whose end protrudes from the end surface of the concrete toward the column member is embedded near the end of the beam member. The lower main bar and the upper main bar of the beam member protrude from the end face of the concrete to the column member side. The column member and the beam member are connected to both steel members, and the joint bar is connected to the lower main bar and the upper main bar. A column / beam joint structure in which concrete is cast and joined around both steel members.