JPS6321603Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rigid frame having a steel/concrete composite structure.

Conventionally, construction methods combining steel and concrete used in rigid frame structures can be roughly divided into reinforced concrete construction and steel reinforced concrete construction.

(1) In reinforced concrete construction, the steel (rebar) handles tension and the concrete handles compression, making it a rational composite structure, but the disadvantage is that concrete is a brittle material and the structure has no stickiness. In particular, the anchorage at the ends of reinforcing bars is expected to be adhesive, and adhesive failure is brittle.

Furthermore, in the joint area where columns and beams intersect, reinforcing bars are intertwined in a complicated manner to ensure sufficient transmission of force from both sides, which poses problems in terms of construction reliability. Furthermore, recently there has been a tendency for there to be a shortage of both the mass and mass of reinforcing bars.

(2) Steel-framed reinforced concrete construction is a construction method unique to Japan that combines reinforced concrete and steel structures, and its tenacity is valued for its earthquake resistance.

However, the current design is to place as many inexpensive reinforcing bars as possible in the cross section of the member, and place expensive steel frames in the remainder. In this way, steel frames and reinforcing bars coexist, making reinforcement work extremely difficult.

As a countermeasure to this problem, it is possible to wrap concrete directly around the steel frame, excluding the reinforcing bars, which have many problems in terms of enforceability.
Workability is improved, but the weight of the expensive steel frame increases, resulting in higher overall costs.

The present invention eliminates the drawbacks of structures based on the above conventional construction methods, eliminates the complexity of reinforcing bar arrangement,
The aim is to provide a steel-concrete composite structure for the embankment, which is easy to construct and highly reliable.

The steel/concrete composite structure frame of the present invention is made by fixing the ends of multiple shaped steel sections with protrusions to each other with tie plates to form the steel frames of the columns and beams.
It is assembled by welding its ends to the required faces of a substantially rectangular parallelepiped steel joint material, wrapping shear reinforcing bars around the columns and beams, and pouring concrete. The details will be explained below with reference to embodiment figures.

FIG. 1a shows an example of a rigid frame having a steel/concrete composite structure according to the present invention, and is a side view showing the steel frame and joint material exposed. Figure b is a sectional view taken along line A-A of the beam in figure a, and figure c is a cross-sectional view taken along line B-B of the column. In the figure, 1 is a column, 2 is a beam, 3 is a rectangular parallelepiped joint joint material, 4 is a shaped steel with protrusions (T-shaped steel) having many protrusions that make up the steel frame of the beam, and 5 is the T-shape of the beam steel frame. A tie plate for welding and fixing the ends of the shaped steel 4;
6 is a shaped steel with a protrusion (angle iron) having a large number of protrusions that constitutes the steel frame of the column, and 7 is an angle steel 6 of the steel frame of the column.
8 is a shear reinforcing bar, and 9 is a concrete part.

In forming the above-mentioned rigid frame, the joining joint material 3
is made by welding a steel plate and a short square steel pipe, for example, and has a rectangular parallelepiped shape with a cross section slightly smaller than a column and a height slightly lower than a beam.

In addition, in the part of the beam 2, the steel frame consists of T-shaped steel sections 4 with many protrusions on the surface (the shape of the protrusions is not particularly limited) arranged in parallel in order to increase the adhesion of concrete. Type plate 5
The end of the steel frame (including the tie plate) is welded to the side of the joint material 3.

In addition, in the part of the pillar 1, angle irons 6 having a large number of protrusions are arranged in parallel at the four corners in this example,
The end portions are welded and fixed with tie plates 7 to maintain a prismatic shape, and the ends (including the tie plates) are welded to the upper and lower surfaces of the joint material 3.

Therefore, shear reinforcing bars 8 are installed in each of the columns and beams.
By wrapping these members in a formwork and pouring concrete, the steel-concrete composite structure rigid frame of the present invention is formed.

The rigid frame according to the present invention is manufactured by separately precasting the column and beam members with exposed ends of the shaped steel, and after the concrete has hardened, they are assembled by welding through the joint material 3 to form the required rigid frame. It can also be formed by filling concrete into the gaps created between the ends of the columns and beams and the joint material after forming the shape.

The steel-concrete composite structure rigid frame of the present invention as described above uses a shaped steel with protrusions that has functions such as sharing the tensile force exerted by reinforcing bars in reinforced concrete construction, adhesion to concrete, and dispersing cracks. , it is possible to omit reinforcement, and by using rectangular parallelepiped joint joint material, an inexpensive and highly reliable rigid frame can be formed.

The effects of the steel-concrete composite structural frame of this invention are summarized below.

(1) Reinforcement and complicated reinforcement work such as in steel reinforced concrete construction can be omitted.

(2) In conventional reinforced concrete construction, the anchoring of the ends of the reinforcing bars depends on the bonding strength of the concrete, and once the bonding is broken, the behavior is brittle;
According to the present invention, since it is firmly fixed to the substantially rectangular parallelepiped steel joint material, the steel materials of the columns and beams are connected in series, resulting in structural toughness.

(3) The use of shaped steel with protrusions increases adhesion to concrete.

[Brief explanation of the drawing]

Figure 1 a is a side view of the steel-concrete composite structure rigid frame of the present invention, and Figure b is the A-A of the beam section in Figure a.
Cross-sectional view, Figure c is a BB cross-sectional view of the column part in Figure a. 1: Column, 2: Beam, 3: Joint joint material, 4: T-shaped steel with protrusion, 5: Beam tie plate, 66: Angle steel with protrusion, 7: Column tie plate, 8: Shear reinforcement,
9: Concrete part.

Claims (1)

[Scope of utility model registration request] Column and beam steel frames made up of multiple shaped steel sections with protrusions whose ends are mutually fixed by tie plates, and rectangular parallelepiped steel frames with the ends of the steel frames welded to the top and bottom or side surfaces. A rigid frame with a steel/concrete composite structure consisting of joint materials, shear reinforcing bars wrapped around columns and beams, and concrete poured around each of the above members.