JPH0522787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of constructing a steel reinforced concrete column.

(Prior art) Conventionally, as a construction method for steel reinforced concrete columns, a center joint or bracket type steel beam is connected to a steel column and spiral stirrups are arranged around the outer periphery of the steel column. A plurality of spiral stirrups in the open state are fitted, then a part of the beam or a beam connection bracket is fixed to a predetermined position of the steel frame, and then the steel frame is erected at the construction site and the main reinforcing bars are inserted into the spiral stirrups. Insert the
Then, extend the spiral stirrups to a specified pitch and connect them to the main reinforcements, then construct a formwork around the outer periphery of the combined main reinforcements and spiral stirrups, pour concrete into the formwork from the top, and concrete the column. There is a way to set it.

(Problems to be Solved by the Invention) According to the above-mentioned conventional method, even in the case of center joint type or bracket type steel frame reinforced concrete structural columns, it is possible to arrange spiral stirrups, and it is possible to arrange them with the main reinforcement on site. Although it has the advantage of being easy to assemble, in the case of multi-story structures, there was a risk that concrete would not be sufficiently spread around the main reinforcement and reinforcement on the lower floor, making it impossible to construct strong columns. In addition, after the steel frame is erected, the main reinforcing bars must be lifted, and the reinforcing bars around the steel frame must be installed in high-rise areas, which poses major problems with the efficiency and safety of hoisting equipment.

The object of the present invention is to provide a method for constructing steel-framed reinforced concrete columns that is free from such inconveniences.

(Means for Solving the Problems) The present invention involves fitting a plurality of folded spiral stirrups around the outer periphery of a column steel frame, and sandwiching the spiral stirrups at predetermined positions of the column steel frame to form a part of the beam. or a process of fixing a plurality of beam connection brackets, and inserting a column main reinforcement into the spiral stirrup, and a spiral band interposed in the section between two beams or brackets that are adjacent to each other in the length direction of the column steel frame. The process of extending the reinforcement and connecting it to the column main reinforcement at a predetermined pitch except for the lower part of the section, and the vicinity of the lower part of the section where the spiral stirrup is not connected to the column main reinforcement with the column steel frame erected at a predetermined position. Concrete is poured from the space surrounded by the main column reinforcement at the bottom of the section by placing the tip of the hopper in the space corresponding to one floor surrounded by the main column reinforcement and spiral stirrups on the lower floor and around it. A pouring process, a connecting process in which spiral stirrups are extended and connected at a predetermined pitch to the column main reinforcement at the bottom of the section where the hopper is placed in order to pour concrete, and after the completion of the connecting process, the concrete is placed on the floor. It is characterized by a concrete pouring process in which concrete is poured from the upper floors.

(Example) Hereinafter, the example will be described in detail with reference to the drawings.

In the drawings, reference numeral 1 denotes a column steel frame made of, for example, H-beam steel, and the column steel frame 1 has dimensions of, for example, three stories. For example, in a steel frame factory, as shown in the first diagram, spiral tie bars 2 are placed around the outer periphery of a column steel frame 1.
For example, two of them are fitted in a vertically compressed folded state, and then a beam 3 (or a bracket for connecting the beam) is fixed at a predetermined position on the side surface of the column steel frame 1 by welding or the like.

At this time, each spiral tie reinforcement 2 is sandwiched between the beams 3.

Next, the above-mentioned column steel frame 1 is transported to the construction site,
As shown in the second diagram, set it on the pedestal 4 and
Insert the spiral ties 2 into the legs of. In this state, attach the column main reinforcement installation jig 5 to the beam 3 (the third
(Fig.), the main column reinforcement 7 is inserted through the hole 6 into the inside of the spiral tie reinforcement 2 around the column steel frame 1, and assembled.

Next, the spiral stirrups 2 are extended to a predetermined pitch except for a predetermined length, for example, 1 m, on the lower side (left side in the drawing) of the section sandwiched between the two beams 3 of the column main reinforcements 7. 7. Bind the wires with, for example, annealed iron wire. Spiral stirrups 2 at the legs of column steel frame 1
, the legs are stretched over the entire length to form a predetermined pitch and tied to the column main reinforcing bars 7 (FIG. 4).

Then, as shown in the fifth diagram, this column steel frame 1 is
It is hoisted by a crane and erected at a predetermined position, and a column formwork 8 is assembled around the spiral ties 2 of a predetermined pitch fitted to the legs of the column steel frame 1. Next, the main column reinforcement 7 on the second floor without the spiral stirrups 2
The tip of the hopper 9 is placed near the bottom of the column formwork 8 below the beam 3 from the bucket 10 through the hopper 9.
Concrete is poured inside and pillar 11 is placed. After the driving is completed, the spiral ties 2 on the second floor are extended to the lower part of the column main reinforcements 7, and the spiral ties 2 are fixed to the column main reinforcements 7 at a predetermined pitch.
Next, as shown in FIG. 6, the column side frames 8 are installed around the main column reinforcements 7 and spiral stirrups 2 on the second floor in the same manner as above.
concrete is poured into the column side frame 8 on the second floor from the lower part of the column main reinforcement 7 on the third floor to which the spiral ties 2 are not applied, and the columns are cast. Do the same for the third floor.

In the above embodiment, the process of fitting the spiral reinforcement into the leg of the column steel frame and the process of connecting the spiral reinforcement to the main reinforcement were performed at the construction site, but these fixings may be performed at the factory.

(Effects of the Invention) According to the present invention, it is possible to arrange spiral stirrup reinforcement even in a center joint type or bracket type steel reinforced concrete structure, and it is also possible to provide spiral reinforcement in the lower part of the section between two adjacent beams or brackets. Connect the spiral stirrups to the column main reinforcement at a predetermined pitch except for Since the spiral stirrups are fixed at a predetermined pitch, concrete placement for columns on each floor can be carried out under the same conditions and is reliable.In addition, since the main reinforcement etc. are arranged before the steel frame is erected, the efficiency and safety of the lifting machine are improved. It has excellent effects.

[Brief explanation of drawings]

The drawings are explanatory diagrams of each step-by-step construction process according to the embodiment of the present invention, and FIGS. 1, 2, 4, 5, and 6 are front views, and FIG. 3 is a side view. It is a diagram. 1...Column steel frame, 2...Spiral stirrup, 3...
Beam, 4... Frame, 7... Column main reinforcement, 8... Column formwork.

Claims (1)

[Claims] 1. Fitting a plurality of folded spiral stirrups around the outer periphery of a column steel frame, and fixing a part of a beam or a plurality of beam connection brackets to a predetermined position of the column steel frame with the spiral stirrups sandwiched therebetween; The column main reinforcement is inserted into the spiral stirrup, and the spiral stirrup interposed in the section between the two longitudinally adjacent beams or the brackets is extended to remove the column main reinforcement except for the lower part of the section. The step of connecting the column steel frame at a predetermined pitch to the main reinforcement of the column, and placing the tip of the hopper near the bottom of the section where the spiral stirrup is not connected to the column main reinforcement with the column steel frame in a predetermined position, A concrete pouring process in which concrete is poured from the space surrounded by the main column reinforcements into a space equivalent to one floor surrounded by the main column reinforcements and spiral stirrups on the lower floor, and around it, and then concrete is poured in a sequential manner. The method consists of a joining process in which spiral stirrups are extended to the column main reinforcement at the bottom of the section where hoppers have been placed and joined at a predetermined pitch, and a concrete pouring process in which concrete is poured into the relevant floor from the upper floor after the joining process is completed. A construction method for steel-framed reinforced concrete columns.