JPH0428063B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications TECHNICAL FIELD This invention relates to a rigid frame for construction.

Conventional technology and its problems In recent building construction, the prefabricated construction method is widely used not only for walls and floors but also for columns and beams, but the biggest drawback of the prefabricated construction method is that it is easy to connect parts and change the design. This is something that cannot be done.

Particularly recently, in order to improve the economic efficiency and fire resistance of buildings, columns are often made of precast concrete and beams are often made of steel members. In such cases, joining is generally troublesome due to the difference in the materials of both members.

Furthermore, since the structure of the column-beam joint is completely different depending on whether the beam to be joined is a steel frame member or a precast concrete member, conventional joining methods have the drawback of being inflexible and having extremely poor workability.

In addition, Japanese Patent Application Laid-Open No. 59-173441 discloses a construction method for a steel reinforced concrete structure in which hollow precast concrete columns are pre-erected or fitted outside the steel frame, and concrete is filled between the precast concrete columns and the steel frame to integrate them. As stated in the official gazette, a steel frame is provided along the entire length of the column. There were problems with economics, on-site workability, and dimensional accuracy as each floor had to be built separately.

This invention was proposed in order to solve the above-mentioned conventional problems, and it is possible to easily connect columns and beams regardless of the type of members on both sides, and it is possible to easily connect columns and beams without increasing the floor height of the building. The purpose is to provide architectural Ramen that can be freely changed according to the needs.

Means for Solving the Problems This invention consists of forming columns on the upper and lower floors with a hollow cross-section using precast concrete, and installing a steel frame member having a plurality of shear connectors at both the upper and lower ends between the columns on the upper and lower floors. The upper and lower ends are inserted into the hollow parts of the pillars on the upper and lower floors, and attached by bolting to the plate-shaped brackets protruding from the pillars on the upper and lower floors, and concrete is placed around the hollow parts of the pillars on the upper and lower floors and around the steel members. The above object is achieved by filling the steel frame and joining the beam to the bracket of the steel frame member.

Embodiment Hereinafter, the present invention will be described by way of an illustrative embodiment.

In FIGS. 1 and 2, number 1 is a column on the first floor, number 2 is a column on the second floor, numbers 8 and 10 are steel members, and number 4 is a beam.

Columns 1 and 2 on the first and second floors are made of precast concrete and have a rectangular hollow cross section. Note that the pillars 1 and 2 are not limited to a rectangular cross section.

In addition, a plurality of main reinforcing bars 5 are located inside the concrete of the columns 1 and 2, and are inserted continuously in the vertical direction of the columns, with both upper and lower ends protruding by a predetermined length. Joint portions 5a or anchor portions 5b are formed at both upper and lower ends of the main reinforcement 5.

Further, vertically long plate-shaped brackets 6, 6 are provided projecting from the upper and lower ends of the columns 1, 2. The plate-like brackets 6, 6 are attached to the four inner sides of the hollow portions 7 of the columns 1, 2 by anchoring.

Between the pillars 1 and 2 of the upper and lower floors formed in this way, a steel frame member 8 is inserted at its upper and lower ends into the hollow part 7 of the pillars 1 and 2 for a predetermined length, and is bolted to the plate brackets 6 and 6. installed by
Furthermore, the main reinforcements 5, 5 in the columns 1, 2 are connected to the joints 5a, 5.
A is connected by joining them with couplers 9,9.

Further, a steel frame member 10 is attached to the lower end of the column 1 by inserting its upper end into the hollow portion 7 of the column 1 for a predetermined length and bolting it to plate-shaped brackets 6, 6. In addition, plate-shaped bracket 6
Instead of using angle members at the ends of columns 1 and 2, angle members may be used.

The steel members 8 and 10 are formed in a cruciform cross section.

A bracket 11 having an H-shaped cross section is protruded from approximately the center of the steel frame member 8 by welding on one or all sides as necessary. Furthermore, shear connectors 12 made of reinforcing bars, stud bolts, etc. are attached by welding over a certain range inside both upper and lower ends of the steel frame member 8.

Further, anchor fittings 13, 13 are bolted to four sides of the steel frame member 10 at approximately the center thereof. Further, a shear connector 12 is attached to the inside of the upper end of the steel frame member 10 over a certain range by welding.

The columns 1 and 2 assembled in this way are fitted with steel members 10 in the vertical holes 14 that have been formed in the foundation 3 in advance.
It is erected vertically by erecting the lower end of the main reinforcement 5 and the anchor part 5b of the main reinforcement 5. and,
Concrete 15 is placed around the steel frame member 10 in the pit 14 and in the hollow part 7 of the column 1 until the steel frame member 10 and the anchor portion 5b of the main reinforcement 5 are completely buried, and then the anchor fittings 13, 13 are placed on the foundation. It is fixed by anchoring to 3.

Furthermore, by pouring concrete 15 around the steel frame member 8 between the upper and lower columns 1 and 2 and in the hollow part 7 of the upper and lower columns 1 and 2 until the steel frame member 8 and the joint part 5a of the main reinforcement 5 are completely buried. Complete integration between the upper and lower columns 1 and 2 is achieved. Furthermore, a beam 4 made of H-shaped steel is connected to the bracket 11 of the steel frame member 8 by a connecting bolt and a connecting plate.
The floor is constructed above.

In such a configuration, depending on the design situation of the column cross section, concrete is poured into the hollow part 7 of the columns 1 and 2 over the entire length of the columns 1 and 2, or concrete is poured into the hollow part 7 of the columns 1 and 2, or the part where the steel members 8 and 10 are inserted. Concrete may only be placed in

In addition, if the floor height is changed, the steel frame members 8
This can be easily done by appropriately changing the position of the steel frame member 8 in the vertical direction and changing the height of the beam before fixing the beam.

3 to 7 show other embodiments of the present invention, in which the beam 4 is made of reinforced concrete.

A bracket 16 having a T-shaped cross section is attached to the side surface of the steel member 8 by welding or bolting.

A precast concrete U-shaped member 17 with a U-shaped cross section opening directly above is placed on the bracket 16 and is fixed to the bracket 16 by welding or bolting. The precast concrete U-shaped member 17 also serves as a beam formwork and is formed with a predetermined beam depth.

Beam main reinforcements 18, 18 are arranged on the upper side of the precast concrete U-shaped member 17. Also,
Precast concrete plates 19, 19 are laid on both sides of the precast concrete U-shaped member 17, and these precast concrete plates 19, 19
The necessary main floor reinforcements (not shown) are placed above. The inside of the precast concrete U-shaped member 17 and the precast concrete plate 1
The beam 4 and the floor 20 are constructed by pouring concrete 15 onto the beam main reinforcements 9, 19 until the beam main reinforcements 18, 18 and the floor main reinforcement are completely buried.

FIG. 6 shows a modification of the bracket 16 for joining the precast concrete member 17 to the steel member 8. In FIG.

If the inside of the precast concrete pillars 1 and 2 is made into a rectangular shape, as shown in Fig. 8, the air tube 21 is fixed inside the corner blocks 22 arranged radially, and the tube is expanded to the required size and then the concrete is made. After forming, cure for a certain period of time, release the internal pressure of the tube, and create corner block 2.
Make sure to remove 2.

Note that if the precast concrete columns 1 and 2 are to be manufactured into circular shapes, it is desirable to use centrifugal forming.

Effects of the Invention Since the present invention has the above configuration, it has the following effects.

By partially installing steel members as joint hardware between the columns on the upper and lower floors and omitting the steel members in the middle of the columns as a steel reinforced concrete structure, construction costs can be reduced by simplifying construction work and saving on steel members. can be achieved.

In addition, both upper and lower ends of the steel frame members are inserted into the hollow parts of the pillars on the upper and lower floors, bolted to plate-shaped brackets protruding from the ends of the columns, and concrete is poured around the hollow parts of the columns and the steel members. By installing it, it can be attached integrally with the pillars on the upper and lower floors.

Steel beams and reinforced concrete beams can be easily installed by replacing the steel members at the column-beam joints.

Since the same construction method as steel frame construction can be used, two pillar materials are used.
The construction period can be shortened since it is possible to construct up to three floors.

The pillars themselves serve as both the frame and the concrete plate frame, making it easy to work with and economical.

The steel members are bolted to plate-shaped brackets that protrude from the pillars on the upper and lower floors, and multiple shear connectors are protruded from both the upper and lower ends of the steel members so that they can be integrated with the concrete.
Furthermore, since concrete is placed around the steel members, the steel members can be integrally attached between the columns on the upper and lower floors.

Furthermore, since the steel frame members are completely buried in concrete, their rigidity is further increased and fire resistance can also be ensured.

By appropriately moving the steel frame members between the upper and lower floor pillars upward and downward, the floor height can be changed freely.

Depending on the design situation, you can choose whether to pour concrete inside the column for the entire length of the column or for the part where steel members are inserted. Therefore, economical concrete placement is possible.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention; Figure 1 is a partially cutaway side view of a rigid frame for construction; Figure 2 is a sectional view taken along line A-A in Figure 1; 3 to 7 show other embodiments of the present invention, in which FIG. 3 is a partial side view of a rigid frame for construction, FIG. 4 is a sectional view taken along line B-B in FIG. 1, and FIG. The figure is a sectional view taken along the line C--C in FIG. 3, FIGS. 6 and 7 are perspective views of a precast concrete U-shaped member, and FIG. 8 is a sectional view when a precast concrete column is manufactured. 1, 2...Column, 3...Foundation 4...Beam, 5...Main reinforcement, 6...Plate bracket, 7...Hollow part, 8...
... Steel frame member, 9 ... Coupler, 10 ... Steel member, 11 ... Bracket, 12 ... Shear connector, 13 ... Anchor fitting, 14 ... Pit hole, 15
...Concrete, 16...Bracket, 17...
...Precast concrete U-shaped member, 18...
Beam main reinforcement, 19... precast concrete plate,
20...floor, 21...air tube, 22...corner block, 23...temporary brace material.

Claims (1)

[Claims] 1. Columns on the upper and lower floors are formed with precast concrete into a hollow cross-sectional shape, and between the columns on the upper and lower floors, a steel frame member having a plurality of shear connectors at both the upper and lower ends is connected to the hollow section of the columns on the upper and lower floors. At the same time, it is attached by bolting to the plate-shaped brackets protruding from the pillars on the upper and lower floors, and the hollow parts of the pillars on the upper and lower floors and around the steel members are filled with concrete, and the brackets of the steel members are filled with concrete. Architectural Ramen characterized by being made by joining beams.