JP2540314B2 - Steel rebar concrete columns and beams - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steel reinforced concrete column or beam.

[Conventional technology]

As a conventional steel or reinforced concrete column or beam of this type, as shown in FIG. 7, a reinforcing bar 5 consisting of a main bar 9 and a stirrup 10 is put in a vertically long outer frame 12 having an opening kerf 11 at the upper side. After placing it in place, the upper opening kerf 11
There is one constructed by placing concrete 6 from.

[Problems to be solved by the invention]

According to the above-mentioned conventional structure, when the reinforcing bar 5 is put in or the concrete 6 is put, it is necessary to insert it from the upper opening kerf 11 having a small opening width, which causes a problem of complicated manufacturing work. Further, there is a problem that the position of the reinforcing bar 5 tends to move when the concrete 6 is poured. Furthermore, since the outer frame 12 is hollow, there is a problem in that it takes up a volume during transportation.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and a column or beam of steel reinforced concrete according to the present invention has concave portions formed by forming grooves or irregularities on substantially the entire inner wall surface with a predetermined space therebetween and facing each other in parallel. Two outer frame steels with a U-shaped cross section and through holes formed at the opposite positions of these two outer frame steels, so that both ends of which screw parts are formed respectively project toward the convex side. The inserted bolt, the nut fixed to the threaded portion of the bolt so as to sandwich the outer frame steel from both the concave side and the convex side of the two outer frame steels, and
It is composed of a plurality of main bars arranged in parallel with these two outer frame steels and a stirrup fixed so as to be orthogonal to these main bars in a space surrounded by one outer frame steel, and is connected and fixed to the bolt. And a concrete cast into the space surrounded by the two outer frame steels so as to cover the rebars, and the nuts on the convex side of the two outer frame steels and the bolts. It is characterized in that a predetermined interval is set between the end portion and the engaging member of the carrier so that the engaging member can be engaged.

[Action]

The column or beam of the reinforced steel concrete of the present invention is provided with two outer frame steels by adjusting the tightening position of the nut screwed into the threaded portion of the bolt on the concave side and the convex side of the outer frame steel during assembly. Since the space between the outer frame steels can be adjusted, the optimum space for each building or each column or beam can be set to 2
It can be set between two outer frame steels to form columns or beams of optimum width. In addition, since a predetermined gap is provided between the nut tightened and fixed to the bolt on the convex side of the two outer frame steels and the end of the bolt, near the both ends of the bolt, hooks of cranes during transportation, etc. It is possible to detachably attach the engaging member to the above, or to connect and fix with another building structure by utilizing the vicinity of the end portion of the bolt.

In the pillar or beam of the present invention, two outer frame steels as steel frames are connected and fixed to each other by the bolts and nuts, and a reinforcing bar arranged in a space surrounded by the two outer frame steels is fixed to the bolts. As a result, a steel frame rebar integrated structure is formed in which two outer frame steels and rebars are integrated through bolts,
By filling concrete into the steel frame rebar integrated structure, a column or beam that is extremely strong against various loads such as compression, tension, and shear is formed.

In the steel frame rebar integrated structure, the load applied to one of the outer frame steels is transmitted to the other outer frame steel and the rebar through the bolts, and the load applied to the rebar is two outer frames through the bolts. Since it is transmitted to the steel, even when a large load is applied to the column or beam, the stress is dispersed between the outer frame steel and the reinforcing bar through the bolts, the outer frame steel or the reinforcing bar does not easily deform, and therefore the concrete also It does not easily break or crack. Further, since the two outer frame steels are prevented from being displaced from each other by the bolts and nuts in the direction in which they are separated from each other, the inner frame of the outer frame steel is provided with a groove or an unevenness. Peeling of concrete from the wall does not occur easily. Further, by fixing the reinforcing bars to the bolts, the positions of the reinforcing bars with respect to the two outer frame steels are fixed, so that the reinforcing bars are offset to either one of the two outer frame steels, and the Thus, it is possible to prevent a problem that the compression or tensile strength and the shear strength are lowered.

The pillar or beam of the present invention, when transported from a production site such as a factory to a construction site, the outer frame steel, main bars, stirrup,
Since it is possible to divide and transport the individual components such as bolts and nuts, as in the conventional example of FIG.
It can be efficiently transported without taking up volume and bulk. However, each component may be assembled in advance in a factory or the like, and may be transported to a construction site in the state of pillars or beams in which concrete has been cast.

Further, since the nut is tightened on the bolt on the convex side of the outer frame steel, the lateral pressure acting on the outer frame steel is received by the nut on the convex side until the cast concrete hardens. Therefore, the expansion of the gap between the two outer frame steels due to the lateral pressure is prevented, so that it is not necessary to support the outer frame steels by supporting work or the like.

〔Example〕

An embodiment of the present invention will be described based on the description of FIGS. 1 to 6.

The steel reinforced concrete column or beam 1 of this embodiment is
Two outer frame steels 2, bolts 3 and nuts 4 for supporting the two outer frame steels 2 in parallel with each other and keeping a predetermined interval, and fixedly connected to the bolts 3 in the two outer frame steels 2. The reinforcing bar 5 and the concrete 6 placed so as to cover the reinforcing bar 5 in the space surrounded by the two outer frame steels 2.

The two outer frame steels 2 are long steel members each having a substantially U-shaped cross section, and the substantially U-shaped concave portions 2a are opposed to each other, and a predetermined space is provided between both concave portions 2a. Are separated.
Through holes 7 are provided at corresponding positions of the side walls of each outer frame steel 2,
Both ends 3a of the bolt 3 are inserted into the through hole 7, and the both ends 3a of the bolt 3 project from the through hole 7 to the side wall outer surface side which is the convex portion 2b side of the outer frame steel 2. Then, by tightening the bolts 3 with the nuts 4 from both the concave portion 2a side and the convex portion 2b side of each outer frame steel 2, the two outer frame steels 2 are connected in parallel with each other while keeping a predetermined distance. There is.

In the embodiment shown in FIGS. 1 and 4, only one bolt 3 is inserted in the height direction of the outer frame steel 2, but as shown in FIG. 3, two or more bolts 3 are inserted. Good.
Further, as shown in FIGS. 3 and 4, a longitudinal groove 8 is provided on the inner surface wall of the outer frame steel 2 on the concave portion 2a side, or as shown in FIG. 8 or forming a vertical groove 8 as shown in FIGS. 1 and 6 has an advantage that the concrete 6 can be prevented from peeling from the outer frame steel 2. Furthermore, the shape of the outer frame steel 2 can be freely selected according to the place of use, such as a semicircular shape and a doglegged shape.

The reinforcing bar 5 includes a plurality of main bars 9 parallel to the two outer frame steels 2.
And a stirrup 10 connected and fixed to these main bars 9 by welding or a number line so as to form a substantially right angle, and these main bars 9 or stirrup 10 and bolts 3 are welded or fixed to each other by a number line or the like. The reinforcing bars 5 are arranged so as to be located at approximately the center position inside the space where the recesses 2a of the two outer frame steels 2 face each other. The concrete 6 is cast from above two outer frame steels 2 on which a base plate (not shown) as a formwork is laid down and hardened, whereby the reinforcing bars 5, the bolts 3 and 2 are made. The two outer frame steels 2 are integrated to form a steel reinforced concrete column or beam 1.

According to the steel-reinforced concrete pillar or beam 1 of the present invention having the above-described structure, both the steel frame and the reinforced concrete made of the two outer frame steels 2 are made to have a proof stress at room temperature, and the reinforced concrete is reinforced at the time of fire. Since it has a structure that gives it proof strength, it is possible to obtain durable and stable fireproof performance without a fireproof coating.

In addition, because of the high rigidity obtained by the combined effect with steel-framed concrete, the deformation of the building structure is less likely to occur, and therefore, the curtain wall and the like are less likely to be hindered, and the damping property is also small, which causes vibration problems. Hateful. Further, unlike the steel frame structure (S structure), rust prevention is required only on the visible portion of the outer frame steel, so maintenance is easy.

Furthermore, since it is a composite structure of steel frame and reinforced concrete inside thereof, the strength of the concrete 6 inside is improved by the restraining effect of the two outer frame steels 2,
Due to the effect of restraint, the buckling of the outer frame steel 2 and the reinforcing bar 5 is unlikely to occur, and there is an advantage of high toughness such that the deformability is increased. In addition, the cross-sectional size of the pillar or beam 1 can be made smaller and lighter than that of reinforced concrete construction (RC construction), and when placing concrete 6, two outer frame steels 2 are made to stand by bolts 3 to make it horizontal. If the driving is done, there is an advantage that the formwork becomes unnecessary and the placing work can be easily performed.

Further, as compared with the RC structure, the exposed portion of the concrete 6 is smaller, so that the reinforcing bar 5 is exposed by the explosion and the fire resistance is less likely to be impaired. Further, since each component is processed in the factory in the same manner as a normal steel frame construction, and the pillar or the beam 1 is assembled by a joint similar to that of a steel frame, it still has the characteristics of the S structure, It has the advantages that it can be easily prefabricated, the construction period can be shortened, and it can be easily disassembled.

In addition, since the projecting corner of each component is a steel material, there is an advantage that it is excellent in impact resistance. And outer frame steel 2 and rebar 5
It is possible to obtain a free cross section by the combination of and the concrete 6, and it can be applied to either a pillar or a beam.
If both ends of the bolt 3 are projected from the outer frame steel 2 to the outside, the screw portions at both ends of the bolt 3 can be easily connected and fixed to other building structures, and a bolt such as a crane during transportation can be used. The engaging member for the hook can be detachably attached to the threaded portions at both ends of the bolt 3.

〔The invention's effect〕

According to the column or beam of steel-framed reinforced concrete of the present invention, two outer frame steels as steel frames are connected to each other by bolts and nuts, and the reinforcing bars arranged between the two outer frame steels are fixed to the bolts. Therefore, the steel frame and the reinforcing bar are integrated through the bolt to form a steel reinforcing bar integrated structure, and by filling concrete into this steel reinforcing bar integrated structure, it is extremely strong against various loads such as compression, tension and shear. Columns or beams are constructed.

In such a steel frame rebar integrated structure, the load applied to one of the outer frame steels is transmitted to the other outer frame steel and the rebar through the bolts, and the load applied to the rebars is applied to the two outer frame steels through the bolts. Since it is transmitted to the frame steel, even when a large load is applied to the column or beam, the stress is dispersed between the outer frame steel and the rebar, the outer frame steel or rebar is not easily deformed, and therefore the concrete is also cracked or crushed. Etc. does not occur easily. Further, since the two outer frame steels are prevented from being displaced from each other in the direction in which they are separated from each other by the bolts and nuts, in combination with the provision of the groove or the unevenness on the inner surface of the outer frame steel, Peeling of concrete is also unlikely to occur.

In addition, when assembling the steel frame rebar integrated structure before concrete filling, the gap between the two outer frame steels can be adjusted by adjusting the tightening position of the nut with respect to the bolt connecting the two outer frame steels. The optimum spacing according to the building or individual columns or beams can be set between the two outer frame steels to provide columns or beams with an optimum width. Further, since the reinforcing bars are fixed to the bolts, the positions of the reinforcing bars with respect to the two outer frame steels are fixed, whereby the reinforcing bars are offset to either one of the two outer frame steels, and It is possible to prevent a problem that the compressive or tensile strength or the shear strength is lowered at the local portion of the beam.

Further, since a predetermined gap is provided between the nut and the end of the bolt, which are tightened and fixed to the bolt on the convex side of the two outer frame steels, the hook of the crane or the like during transportation is provided near the end of the bolt. It is possible to detachably attach the engaging member to the above, or to connect and fix with another building structure by utilizing the vicinity of the end portion of the bolt.

The pillar or beam of the present invention, when transported from a production site such as a factory to a construction site, the outer frame steel, main bars, stirrup,
Since it is possible to divide and transport the individual components such as bolts and nuts, as in the conventional example of FIG.
It becomes possible to transport efficiently without taking a volume and making it bulky.

Further, since the nut is tightened on the bolt on the convex side of the outer frame steel, the lateral pressure acting on the outer frame steel is received by the nut on the convex side until the cast concrete hardens. Therefore, the expansion of the gap between the two outer frame steels due to the lateral pressure is prevented, so that it is not necessary to support the outer frame steels by supporting work or the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 show an embodiment of the present invention, FIG. 1 is an overall perspective view in which concrete is omitted, and FIG.
II-II sectional view, FIGS. 3 and 4 are longitudinal sectional explanatory views of other embodiments, FIGS. 5 and 6 are perspective views showing an embodiment of the outer frame steel, and FIG. 7 is concrete. It is the whole conventional perspective view which abbreviate | omitted. 1 ... Steel reinforced concrete pillar or beam, 2 ... Outer frame steel, 2a ... Concave, 3 ... Bolt, 4 ... Nut, 5 ...
Reinforcing bar, 6 ... Concrete, 7 ... Through hole, 9 ... Main bar, 10 ... Stirrup.

Claims (1)

(57) [Claims] 1. Two outer frame steels having a U-shaped cross section in which concave portions having grooves or irregularities formed on substantially the entire inner wall surface are opposed to each other in parallel at predetermined intervals, and these two outer frames. Bolts inserted through the through-holes formed at the positions facing each other of the steel so as to project the threaded end portions to the convex side, and both the concave side and the convex side of the two outer frame steels. Nuts tightened and fixed to the threaded portions of the bolts so as to sandwich the outer frame steels from each other, and a plurality of nuts arranged in parallel with the two outer frame steels in a space surrounded by the two outer frame steels. Of the main bars and a stirrup fixed so as to be orthogonal to these main bars, and the reinforcing bars connected and fixed to the bolts, and cast in the space surrounded by the two outer frame steels so as to cover the reinforcing bars. And the nut on the convex side of the two outer frame steels. Column or a beam of steel reinforced concrete, characterized in that the engagement member of the carrying device by setting a predetermined distance between the end of the bolt is to be engaged.