JP2723011B2 - Construction method of steel frame reinforced concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a steel reinforced concrete structure using a column steel frame and a beam member in which precast concrete is integrated with a part of the beam steel frame.

[0002]

2. Description of the Related Art In a method of constructing a steel reinforced concrete structure using a column steel frame and a beam member made of a beam steel frame and a precast concrete, the column steel frame usually forms a joint between the column and the beam. The joint was welded to the column steel frame with a beam steel flange, and the lower main reinforcement laid in precast concrete was laid through the joint with the column in the section of the joint It is constructed by welding to rebar, but it takes time to work on the joints because the joining of the column steel beam and the beam steel of the beam member and the joining of the main rebar depend on welding, and the construction schedule depends on the weather There is a possibility that dimensional accuracy of the beam steel frame length is reduced due to the occurrence of welding distortion due to the influence of welding.

[0003] Further, since the beam member has a composite structure of a steel frame and precast concrete over its entire length, it is heavy, requires a machine with high lifting capacity for construction, and the efficiency of lifting work is low.

[0004] The present invention has been made in view of the above background, and proposes a method of reducing the work of joining steel frames and reinforcing bars on site and improving the efficiency of lifting work.

[0005]

According to the present invention, a beam member is made to penetrate a joint portion, and a column steel frame is bolted to a beam steel frame of a beam member to eliminate the need for welding.
Joint work of rebar at joints by avoiding the effect on beam dimensional accuracy and integrating precast concrete of beam members into only some sections on both sides except for joints with columns Is omitted, the weight of the beam member is reduced, and the lifting work is made more efficient.

[0006] In the construction, the center of the beam member is placed on the head of the lower column steel frame, the beam steel frame is joined to the column steel frame, and the beam steel frames of the adjacent beam members are connected to each other in the axial direction. Then, place the upper column steel frame on the beam steel beam of the beam member and join it to the beam steel frame.Concrete concrete around the lower column steel frame and around the beam steel frame at the joint position with the beam member column. The procedure of casting is repeated.

[0007] The beam member is placed on the column steel at the position of the beam steel at the center exposed from the precast concrete, and the beam steel is bolted to the column steel to eliminate welding between the two steel members, and When the member penetrates the joint with the column, the main beam at the joint can be arranged in the beam member in advance, and welding between the main bars is also eliminated.

The stress of the beam is small at the center in the span direction,
Because the beam member becomes larger at the end, the beam member is designed with steel frame reinforced concrete near the joint and the middle portion of the beam is designed with steel frame. In addition to being more economical than being made from reinforced concrete, it is lighter in weight and more efficient in transport and lifting.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing one embodiment.

The present invention uses a steel member reinforced concrete using a beam member 20 composed of a column steel frame 11 and a precast concrete 22 integrated into a part of the both sides except for the joint between the beam frame 21 and the column 1. It is a method of building a building.

As shown in FIG. 8, the beam steel member 21 of the beam member 20 has a length corresponding to the distance between the columns 1 and 1 of at least one span, and is mounted on the head of the lower column steel frame 11 at the center. And both ends are located at the center between the adjacent columns 1 and 1.

As shown in FIG. 1, the precast concrete 22 is integrated with the beam steel frame 21 only in a part of both sides except for the joint position with the column 1, and the completed beam 2 is structurally a beam member 20. Both ends corresponding to the center of the steel frame are made of steel reinforced concrete, and the middle portions corresponding to the both ends are made of steel, or the steel beam 21 is covered with concrete 8 on site to make steel concrete. In the former case, beam steel 21
Are provided with a fireproof coating on both ends.

The precast concrete 22 has a vertical section,
As shown in FIG. 2, the lower flange and the web of the beam steel 21 are surrounded and integrated with the beam steel 21, and a main reinforcing bar (lower main bar) 23 and a stirrup 24 are arranged inside. Main bar 23 is pillar 1
The upper portion of the stirrup 24 protrudes from the top end of the precast concrete 22.

The section where the beam 2 is made of steel reinforced concrete is located on both sides of the beam member 20 with the column 1 interposed therebetween.
In the embodiment, the main reinforcement 23 is formed in an annular shape, and is continuously wrapped around and arranged in the precast concrete 22, 22 sandwiching the joint, so that the main reinforcement 23 serves as the lower main reinforcement and the upper end main reinforcement.

The beam member 20 is made of precast concrete 22,
It is placed on the head of the lower column steel frame 11 at the part of the beam steel frame 21 sandwiched by 22 and is bolted to this column steel frame 11, and the end of the beam steel frame 21 corresponding to the middle part of the beam 2 is It is connected to the beam steel frame 21 of the beam member 20 adjacent in the axial direction.

The steel column 11 is bolted to the flange of the beam steel 21 by abutting the flange.
Because of the cross-section, as shown in Figs.
The split T hardware 3 is welded in advance to the end of the flange 11 and bolted to the flange of the beam steel 21.
The split T metal piece 3 includes a cut T-section steel, and may be bolted to overlap the flange of the column steel frame 11 in some cases. The beam steel members 21, 21 of the beam members 20, 20 adjacent in the axial direction are connected by bolts to the joint plate 4 laid over both flanges and the web.

FIG. 1 shows an embodiment in which the beam steel 21 of the beam member 20 has a length corresponding to one span. The stress of the beam 2 is small at the middle part in the span direction and large at the end. ,
The dimensions (composition) of the beam steel frame 21 are determined according to the stress of the middle portion of the beam 2, and the upper and lower flanges of the middle portion of the beam steel frame 21 corresponding to the end of the beam 2 are reinforced with the cover plate 5 as shown in FIG. By doing so, the dimensions of the beam steel frame 21 can be kept small. FIG.
A production example of the beam member 20 having a length corresponding to the span will be described.

The procedure for constructing one layer will now be described with reference to FIGS.

FIG. 7 shows a state where the casting of the lower slab concrete is completed.
The beam member 20 is suspended on the 11 (FIG. 8), the beam steel 21 is joined to the column steel 11, and the adjacent beam steels 21 and 21 are connected to each other. After that, the column steel frame 11 on the lower floor side of the beam member 20
At the same time as the main reinforcement 12 and the hoop 13 are arranged around, the column formwork 6 is installed around the column steel frame 11, and the precast concrete floor slab 7 serving as the floor formwork is laid on the beam member 20 (FIG. 9). ). Further, a column steel frame 11 on the upper floor is erected on the beam member 20 (FIG. 10), and concrete 8 is poured into the column formwork 6 and the precast concrete slab 7 (FIG. 11).
Construction of one layer is completed.

In the embodiment, the column steel frame 11 has the length of one layer, and the upper and lower ends are joined to the beam steel frame 21. However, the column steel frame 11 of one layer is divided and a part thereof is divided. The beam in advance
It is joined to the top and bottom of 21 and integrated into the beam member 20, and the beam member
In some cases, the column steel frames 11, 11 divided when the 20 is suspended are joined to each other.

[0021]

The present invention is as described above. Since a beam member is penetrated through a joint and a column steel frame is bolted to a beam steel frame of a beam member, welding becomes unnecessary, and the work process by welding is reduced. The effect on the dimensional accuracy of the beam steel is avoided, and the precast concrete of the beam member is integrated only in some sections on both sides except for the position of the joint with the column, so the reinforcing bars at the joint In addition to omitting the joining operation, the weight of the beam member is reduced, and the efficiency of the transportation and lifting operations can be improved.

[Brief description of the drawings]

FIG. 1 is an elevation view showing a joint between a column and a beam.

FIG. 2 is a longitudinal sectional view of an end position of a beam member in FIG.

FIG. 3 is a partially detailed view of FIG. 1;

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is an elevational view showing a beam member when a middle portion of the beam steel frame is reinforced by a cover plate.

FIG. 6 is an elevation view showing a beam member having a length for two spans.

FIG. 7 is an elevation view showing a stage where the construction on the lower floor side is completed.

FIG. 8 is an elevation view showing a step subsequent to FIG. 7;

FIG. 9 is an elevation view showing a step subsequent to that of FIG. 8;

FIG. 10 is an elevation view showing a step subsequent to that of FIG. 9;

FIG. 11 is an elevation view showing a step subsequent to that of FIG. 10;

[Explanation of symbols]

1 ... pillar, 11 ... pillar steel frame, 12 ... main bar, 13 ... hoop,
2 ... beam, 20 ... beam member, 21 ... steel beam, 22 ... precast concrete, 23 ... main bar, 24 ... stirrup, 3 ... split T hardware, 4 ... joint plate, 5
... cover plate, 6 ... column formwork, 7 ... precast concrete slab, 8 ... concrete.

Claims (1)

(57) [Claims] 1. A method of constructing a steel reinforced concrete structure using a column steel frame and a beam member made of precast concrete integrated into a part of a section on both sides except for a position of a joint between the beam steel frame and the column. After placing the central part of the beam member on the head of the lower column steel frame and joining the beam steel frame to the column steel frame, and connecting the beam steel frames of the axially adjacent beam members to each other, Place the upper column steel on the beam steel of the member and join it to the beam steel, around the lower column steel,
A method of constructing a steel-framed reinforced concrete skeleton by repeating the procedure of placing concrete around the beam steel at the position of the joint between the beam member and the column.