JPH06306931A - Construction of steel frame reinforced concrete structure - Google Patents

Abstract

PURPOSE:To reduce labors and construction, period in the construction of a steel framed reinforced concrete structure. CONSTITUTION:After steel structural columns 1 for at least one floor are erected, column-forms 3 made of precast concrete having a hollow section and main reinforcements 31 and hoops 32 buried in the concrete in advance, are arranged around the steel structural columns. And steel structural beams 2 are suspended between the adjacent column-forms 3, 3. And floor-forms 4 are laid down on the steel structural beams 2. Then concrete is placed on the floor forms 4 and the column-forms 3. This procedure is repeated to construct a steel framed reinforced concrete structure. The labors of arrangement of column- reinforcements, assembling of column-forms and removing thereof can be reduced by use of precast concrete column-forms as the column-forms 3 and further, the construction period can be also reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a steel-framed reinforced concrete structure.

[0002]

[Problems to be Solved by the Invention] The construction of a steel-framed reinforced concrete structure is carried out by erection of a pillar steel frame on a slab, then arranging around the pillar steel frame, simultaneously assembling a pillar formwork, and constructing a steel beam between the pillar steel frames. After laying the floor formwork on the pillar formwork,
Concrete is placed on the floor formwork and in the column formwork, but since the column formwork that is diverted is used, some time is spent on the formwork and until demolding. Since it is necessary to wait for concrete to harden, the use of divert formwork is an obstacle to shortening the construction period.

The present invention was made for the purpose of shortening the construction period of a steel-framed reinforced concrete structure, and proposes a construction method that saves labor for formwork.

[0004]

SUMMARY OF THE INVENTION In the present invention, by using a precast concrete pillar formwork having a hollow cross-sectional shape in which a main bar and a hoop are embedded in advance in the pillar formwork, the bar reinforcement and the pillars are arranged. The work of assembling and demolding the formwork is omitted, and the construction period is shortened.

To construct the frame, at least one layer of column steel frame is erected, the above-mentioned column form is installed around the column steel frame, and the steel frame beams are installed between the adjacent column forms, and on the steel frame beams. It is carried out by repeating the procedure of laying a floor formwork on the floor form and placing concrete on the floor formwork and in the pillar formwork.

The pillar formwork is made of precast concrete,
By embedding the main bars and hoops inside, the reinforcement and demolding around the pillar steel frame are omitted, and there is no need to wait for the hardening after placing concrete in the pillar formwork, and the transition to the upper floor construction Will be carried out smoothly, and the progress of construction will be promoted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

According to the present invention, as shown in FIG. 1, a pillar steel frame 1 is erected, a precast concrete pillar frame 3 is installed around the pillar steel frame 1, and a steel beam 2 is provided between adjacent pillar steel frames 1 and 1. The floor formwork 4 is laid on the steel beam 2 and the concrete 5 is placed on the floor formwork 4 and in the pillar formwork 3 by repeating the procedure of erection of the steel frame reinforced concrete structure. How to build.

As shown in FIGS. 10 to 12, the pillar form 3 has a hollow cross-sectional shape in which a main bar 31 and a hoop 32 are previously embedded in concrete 33. The hollow portion 34 has an area into which the pillar steel frame 1 can be inserted, and the main bars 31 project from the upper and lower ends of the concrete 33 by a length sufficient for the joint with the main bars 31 of the pillar formwork 3 on the upper and lower floors. 11 shows the case where the hollow portion 34 has a circular shape, and FIG. 12 shows the case where the circular shape and the rectangular shape are combined, the hollow portion 34 is determined by the cross-sectional shape of the pillar steel frame 1.

FIGS. 13 to 16 show an example of production in which concrete 33 is further arranged with giverel bars 35 in order to secure the integrity with the concrete 5 placed in the hollow portion 34. Is. Part of the gibber muscle 35 projects into the hollow portion 34,
A part is fixed and reinforced in the concrete 33, and the shear force between the two is transmitted at the boundary surface with the concrete 5 that is post-cast, and the integrity of the column form 3 and the concrete 3 is secured.

In the manufacturing examples shown in FIGS. 13 and 14, the gibber streak 35 is formed in a corrugated form, and it is arranged along the boundary with the hollow part 34 at an appropriate position on the cross section, and is fixed in the concrete 33 by the steady rest 36. 15 and 16 show that the gibber reinforcement 35 is arranged at an appropriate interval in the axial direction of the column form 3 and is laid around the hollow portion 34 in a hoop shape so that both sides are anchored in the concrete 33. This is the case where the intermediate portion is projected into the hollow portion 34. In the latter case, the gibber reinforcement 35 not only integrates the concrete 33 and the concrete 5, but also circulates in the concrete 33 to constrain the concrete 5 together with the hoop 32 to increase the shear resistance of the concrete 5, Further, the shearing force of the column is shared by the concrete 5 and the column form 3.

The construction procedure will be described with reference to FIGS.

First, at least one layer of column steel frame 1 is erected by connecting to the column steel frame 1 on the slab as shown in FIGS. 2 and 3 or on the lower floor as shown in FIG. The pillar formwork 3 is installed around. In the embodiment shown in FIG. 2 to FIG. 7, a pillar formwork 6 made of a weir board is used as a formwork around the pillar steel frame 1 on the first floor, and a pillar formwork 3 is used from around the pillar steel frame 1 on the second floor. Therefore, the pillar steel frame 1 having a length of two layers is erected on the slab before the pillar formwork 3 is installed, and the steel frame beam 2 is erected between the pillar steel frames 1 and 1 and the steel frame beam 2 is provided. The floor formwork 4 is laid on the floor.
For the floor form 4, a precast concrete floor slab that does not require demolding or a floor slab similar to it is used.

The column form 3 is installed by being dropped from above, and is supported by the steel frame beam 2 on the lower floor side or the floor form 4, for example, in the joint portion with the steel frame beam 2 in FIG. As shown in FIG. 9 which is a detailed view, it is supported by the receiving member 7 on the steel beam 2, and its main reinforcement 31 is connected to the main reinforcement 31 of the column form 3 on the lower floor by pressure welding, a lap joint or the like.

After the column form 3 is installed, as shown in FIGS. 4 and 5, the steel frame beam 2 is erected while being supported by the column steel frames 1 and 1, and at the same time, the floor form 4 is laid on the steel frame beam 2. Thereafter, as shown in FIG. 7, concrete 5 is placed on the floor formwork 4 and in the pillar formwork 3. In the illustrated embodiment, the concrete form 5 is placed in the pillar formwork 3 as shown in FIG. Prior to the placing of the concrete 5 in the concrete, the concrete 5 is placed in the pillar formwork 6 on the lower floor and on the floor formwork 4 thereabove.

Thereafter, from the standing of the pillar steel frame 1 to the installation of the pillar formwork 3, the installation of the steel beam 2 and the laying of the floor formwork 4, and the placing of concrete 5 in the pillar formwork 3 and on the floor formwork 4. The procedure is repeated until the skeleton is constructed.

[0017]

The present invention is as described above. Since a column mold made of precast concrete is used which has a hollow cross-section and main ribs and hoops are previously embedded in the column frame, The work of assembling and demolding the bar arrangement and the pillar formwork is omitted, and at the same time, there is no need to wait for the concrete to harden, labor saving and progress of construction can be achieved, and the construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing a column / beam frame with a column form installed.

FIG. 2 is an elevational view showing a state when a pillar steel frame is erected.

FIG. 3 is an elevational view showing a state when a pillar formwork is installed.

FIG. 4 is an elevational view showing a state in which a steel frame beam is erected on a pillar formwork.

FIG. 5 is an elevational view showing how the column formwork is assembled around the column steel frame on the first floor.

[Fig. 6] Fig. 6 is an elevational view showing the state of concrete pouring in the pillar formwork on the first floor and on the floor formwork.

FIG. 7 is an elevational view showing how concrete is placed inside the pillar formwork on the second floor and on the floor formwork.

FIG. 8 is an elevational view showing the connection between the pillar formwork and the steel beam.

9 is a partially enlarged view of FIG.

FIG. 10 is an elevational view showing an example of manufacturing a pillar formwork.

11 is a cross-sectional view of FIG.

FIG. 12 is a cross-sectional view showing another example of manufacturing a pillar formwork.

FIG. 13 is an elevational view showing an example of manufacturing a column form in which the gibber reinforcement is arranged.

14 is a cross-sectional view of FIG.

FIG. 15 is an elevational view showing another example of manufacturing the columnar frame in the case where the gibber reinforcement is arranged.

16 is a cross-sectional view of FIG.

[Explanation of symbols]

1 …… Column steel frame, 2 …… Steel beam, 3 …… Column formwork, 31 …… Main bar, 32 …… Hoop, 33 …… Concrete, 34 …… Hollow part, 35 …… Givere bar, 36 …… Runout Staples, 4 ... Floor formwork, 5 ... Concrete, 6 ... Pillar formwork, 7 ... Receiving member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Joji Yamamoto 1-3-15 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd. Osaka Branch

Claims (1)

[Claims] 1. After erection of at least one layer of column steel frame, a column form made of precast concrete in which main bars and hoops are previously embedded in concrete and made into a hollow cross-sectional shape is installed around the column steel frame. Then, while constructing a steel frame beam between adjacent column formwork, laying a floor formwork on the steel frame beam,
A method for constructing a steel-framed reinforced concrete structure by repeating the procedure of placing concrete on the floor formwork and in the column formwork to construct the structure.