JPH0694700B2 - Reinforced steel composite column - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforced steel frame composite column used for a reinforced steel frame composite building frame in which columns are made of reinforced concrete and beams are made of steel frame.

“Conventional Technology” One of the economical construction frameworks for construction is a construction framework where columns are made of reinforced concrete and beams are made of steel.

Conventionally, in order to construct this kind of building frame, for example, an I-shaped steel fitting is integrally attached to a part of a reinforcing bar cage in which a column main bar and a hoop bar are assembled into a cylindrical cage shape, and this joining is carried out. Assembled reinforcing bars for columns, which are constructed by joining steel beams to the ends of metal parts, are used. That is, by manufacturing such an assembled reinforcing bar in advance in a factory or the like, it is possible to simplify the on-site work.

"Problems to be solved by the invention" In such an assembled rebar, the mechanical strength of the joint portion with the steel beam is the mechanical safety of the building frame, and eventually the entire building structure supported by this frame. Greatly affect the. Therefore, it is necessary for the joint metal or the like to have a structure in which the stress state of the joint with the steel beam is sufficiently taken into consideration. Further, in view of improving the construction efficiency, in the method of installing the joining metal fitting at the joining portion between the assembly rebar and the steel beam, the joining strength between the assembly rebar and the steel frame is determined by welding or bolt joining the joining metal article and the steel frame beam. Will depend only on the strength of
There is a strong demand for improvement in bonding strength. On the other hand, if the joining strength is increased by using a large number of the joining hardware, there is a problem that the structure of the joint portion becomes complicated and there is a fear that the work efficiency may be lowered. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reinforced steel-frame composite column in which the mechanical strength of a joint portion with a steel beam is secured.

"Means for Solving Problems" A reinforcing steel-frame composite column of the present invention is a column reinforcing bar cage configured by a plurality of column main bars and hoop bars over a length of a plurality of floors, and the column reinforcing bar. A joint structure for connecting steel beams attached to a plurality of main pillars of a car at a predetermined interval for a plurality of floors, and the total length of the reinforcing bar car for pillars and the joint structure And a concrete structure, wherein the joint structure is a beam steel frame part formed by integrating beam steel frames in an intersecting state, and the beam steel frame part is arranged and fixed so as to surround the beam steel frame, and It is composed of a connecting portion reinforcing reinforcing bar which is circumscribed to the main reinforcing bar and extends in the beam direction.

[Operation] According to the present invention, it is possible to wind concrete around the joint structure by utilizing the reinforcing reinforcing bar for the joint.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS.

The reinforced steel composite column of the present invention is formed by placing concrete on a column unit configured by assembling reinforcing bars and steel frames, and FIG. 1 schematically shows the column unit Y. It is a figure, and the code | symbol 1 in the figure is a reinforcing bar cage for columns of a length corresponding to the height of a plurality of floors of a building structure. A plurality of [three (three floors) in the present embodiment] connection forming bodies 2, that is, the column reinforcing bar cage 1 is a steel beam in the column reinforcing bar cage 1 at intervals in the length direction. Members for joining are attached. The pillar unit Y is preliminarily assembled in advance on the ground by using a gantry or a hanging jig, and constitutes a reinforced steel frame composite pillar by placing concrete after the assembly is completed. .

As shown in FIG. 2, the pillar reinforcing bar cage 1 is assembled into a substantially rectangular tubular shape by a plurality (for example, 12) of column main bars 3 and a large number of hoop bars 4 surrounding them so as to bundle them over the entire length. It has been done. In other words, pillar main muscle 3
Four of them are arranged at the corners of a square as shown in Fig. 3,
The remaining column main reinforcements 3 are arranged in the same number on each side of the quadrangle. The column main bars 3 at the corners are, for example, deformed reinforcing bars, and the column main bars 3 at the sides are, for example, screw reinforcing bars. In addition, as shown in FIG. 1, the pillar main bars 3 are inwardly buckled inwardly at intervals in the longitudinal direction of the pillar reinforcing bar cage 1 inside the rectangular main body 3 surrounded by the pillar main bars 3. A plurality of buckling prevention frames 5 (see FIG. 3) for preventing the above are provided. Further, a sleeve joint 6 is provided at the lower end of each column main bar 3.

The joint structure 2 is composed of a beam steel frame portion 8 projecting in a direction intersecting with the longitudinal direction of the column reinforcing bar car 1 and a joint reinforcing steel rod 9 provided outside the beam steel frame portion 8. ing.

The illustrated beam steel frame portion 8 has a shape in which two H-shaped steels are crossed in a cross shape. That is, the beam steel frame portion 8 is formed by a cross-shaped vertical plate between a pair of cross-shaped horizontal plates 10.
It has a shape of 11 and has arms that project in four horizontal directions. As shown in FIG. 4, the column main bars 3 of the above-mentioned side penetrate through the base ends of the four arms of both horizontal plates 10, and the nuts 12 are screwed into the penetrated column main bars 3 as shown in FIG. By tightening the upper and lower horizontal plates 10 from above and below with these nuts 12, the entire joint structure 2 is fixed to the column reinforcing bar cage 1. Also, at the intersection of both horizontal plates 10,
As shown in FIGS. 2 and 4, four shear reinforcing bars 13 slightly longer than the height dimension of the beam steel frame portion 8 penetrate and are fixed to the horizontal plate 10 by nuts or welding. Further, as shown in FIG. 4, air holes 14 having a diameter larger than the wall thickness of the vertical plates 11 are formed inside the through-holes of the shear reinforcing bars 13 in both the horizontal plates 10. The column main reinforcements 3 at the corners are located on the sides of the intersections of the horizontal plates 10 avoiding the intersections as shown in FIG.

On the other hand, the reinforcing reinforcing bar 9 is composed of four reinforcing main bars 15 assembled in a cross beam shape as shown in FIG. 2 and a large number of reinforcing stirrup bars 16 that bundle these reinforcing main bars 15. That is, each reinforcing main bar 15 is formed in a loop shape as shown in FIG. 5, and each of the reinforcing main bars 15 makes a round around one arm of the beam steel frame portion 8 and a vertical plate is formed on the side of another arm adjacent to this arm. It is arranged along 11. The reinforcing stirrup muscles 16 are arranged so as to surround the respective arms as shown in FIG. 2 while bundling the reinforcing main muscles 15 on both sides of each arm.

The pillar unit Y is entirely integrated by placing concrete 19 so that the entire length of the pillar reinforcing bar cage 1 and the joint structure 2 are embedded therein.

Next, a method for actually constructing a reinforced steel frame composite column with the column unit Y as a core and a method for constructing an actual building frame using the reinforced steel frame composite column will be described.

First, a plurality of pillar units Y are prepared, and these are individually lifted by a crane or the like, connected to a cage-shaped reinforcing bar 17 that is erected on a foundation in advance by a sleeve joint 6, and are erected at predetermined positions. . Next, as shown in FIG. 6, a steel beam for the second floor (a beam for supporting the floor of the second floor) 18 is bridged between the respective second-tier connection components 2 of the pillar units Y which are vertically installed adjacent to each other. The end of this steel beam 18 and the joint structure 2
The end portion of one arm of the beam steel frame portion 8 is joined by welding or bolts. Further, the steel beams for the third floor and the rooftop are joined between the remaining connection structure bodies 2 in the same procedure as the bridging work of the steel beams 18 for the second floor. In this way, the frameworks from the first floor to the third floor are constructed at once. After that, the formwork is provided around the pillar rebar cage 1 on the first floor (the portion below the steel beam 18 for the second floor) and around the reinforcing reinforcing bar 9 for the joint of the joint structure 2 for the second floor (illustration). (Abbreviated) is attached, and concrete 19 is placed inside it. That is, at the same time as constructing a reinforced steel frame composite column, concrete 19 is wound around the joint structure 2 corresponding to both ends of the steel beam 18 as shown by chain lines in FIGS. 4 and 5. The concrete 19 is placed so as to include the beam steel frame portion 8 and the joint reinforcing bar 9. That is, the joint portion between the column reinforcing bar cage 1 and the steel beam 18 is reinforced. Then, after the concrete 19 is hardened, the same procedure is sequentially repeated on the upper floor.

By the way, the air holes 14 formed in both horizontal plates 10 are
Since it serves as an air discharge port inside the formwork when the concrete 19 is placed, the concrete 19 can be spread to every corner inside the formwork.

Although the beam steel frame portion 8 is formed in a cross shape in the above-described embodiment, it may be formed in a T shape in three directions, or may be formed in an L shape, a linear shape, or the like in two directions. You may form so that it may project only in the direction. Also, when the beam forming dimensions to be joined are different, or when the beam levels are different and the beams can be attached to columns in different steps, the shape of the beam steel frame portion 8 can be changed in the joint structure 2. It is possible. Further, the reinforcing reinforcing bar 9 for connection is not limited to the above embodiment, and instead of the reinforcing reinforcing bar 15 having a loop shape, for example, a large number of rod-shaped reinforcing bars extending through the vertical plate 11 in the projecting direction of the beam steel frame portion 8 are formed. Reinforcement bar may be used. Further, the reinforcing main bar 9 may extend beyond the beam steel frame portion 8 and extend longer than this. In this case, the reinforcing bar for the joint 9
With the steel beam 18, the concrete 19 can be wound directly on the outer side of the joint between the joint structure 2 and the steel beam 18 so that the steel beam 18 is attached to the beam steel portion 8 after the connection.

[Effects of the Invention] As described above, according to the present invention, a joint structure for joining a steel frame beam is provided in a part of a column reinforcing bar cage. Since it is composed of the beam steel frame portion projecting in the direction intersecting with the car and the reinforcing bar provided outside the beam steel frame portion, the following excellent effects can be obtained.

Since the joint reinforcement reinforcing bars are fixed so as to surround the perimeter of the beam steel frame, the stress acting on the beam steel frame is efficiently dispersed, and moreover, the concrete wound around the joint structure is Since it is possible to contribute to the dispersion of the stress and reinforce the joint portion between the column reinforcing bar and the steel beam, the strength of the building structure constructed by using the reinforced steel composite column is improved. Therefore, the mechanical safety of the building structure can be improved.

Saves time and labor to form joints for steel beam joints on-site.
The construction period can be greatly shortened, and work at high places such as reinforcement work at a steel beam joint site is reduced, thus improving work safety. In particular, the work of reinforcing the reinforcing bar of the joint portion can ensure workability by avoiding the work of attaching the main reinforcing bar of the column or the like forming the column reinforcing bar cage at the joining site.

If a plurality of joint structures are provided on a single column reinforcing bar cage, it is possible to assemble a plurality of building frames at once.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a side view schematically showing the whole pillar unit, FIG. 2 is a perspective view of a main part, and FIG. 3 is FIG. III-III line view of FIG. 4, FIG. 4 is an IV-IV line view of FIG. 1, FIG. 5 is a VV line view of FIG. 4, and FIG. It is a side view explaining the method of constructing an actual construction frame. 1 …… Reinforcement basket for columns, 2 …… Connection structure, 3 …… Column main bar, 4 …… Hoop reinforcement, 8 …… Beam steel part, 9 …… Reinforcing reinforcement for connection, 10 …… Horizontal plate, 11 …… vertical plate, 15
…… Reinforcement main reinforcement, 16 …… Reinforcement stirrup reinforcement, 19 …… Concrete.

Claims (1)

[Claims] 1. A rebar cage for a pillar, which is composed of a plurality of main pillar reinforcements and hoop reinforcements over a length of a plurality of floors, and a plurality of predetermined ones of a plurality of main reinforcement bars constituting the rebar cage for a pillar. A joint structure for joining steel beams connected by a plurality of floors at intervals, and the total length of the column reinforcing bar cage and concrete cast in the joint structure, the joint structure is a beam A beam steel frame portion formed by integrally integrating steel frames in a crossing state, and a reinforcing portion which is fixed to the beam steel frame portion by surrounding it and circumscribing the main pillars and extending in the beam direction. Reinforcing steel-steel composite columns characterized by being composed of reinforcing bars.