JP2907047B2 - How to build a composite frame - Google Patents

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 composite frame in which a steel girder is erected in one direction between columns and a precast girder is erected in another direction.

[0002]

2. Description of the Related Art Generally, reinforced concrete (hereinafter referred to as RC) is used.
Abbreviated. In the case of a built-in building, since the reinforcing bars intersect in a complicated manner, especially in the panel zone where the columns and beams intersect, the construction takes a lot of time. Various composite frames have been proposed in which RC girders are erected in the direction of and steel girders are erected in other directions. FIG. 11 shows a conventional general composite frame of this type. After the RC column 1 is erected at a predetermined position, the composite frame is moved in one direction between the RC columns 1 and 1. A precast (hereinafter, abbreviated as PC) giant beam 2 having a length of one span between the RC columns 1 and 1 is erected, and a connection member 3 such as a gusset plate or a connection hardware is provided on a side surface of an upper end of the RC column 1. By attaching the ends of the steel girders 4 shorter than the one span to the connecting members 3 and 3, the steel girders 4 are erected in the other direction between the columns 1 and 1. Further, it is constructed by erection of a steel beam 5 at a predetermined position between the steel beams 4.

[0003]

However, in such a conventional method of constructing a composite frame, it is necessary to attach a joining member 3 for joining the steel girders 4 to each column 1 by welding or the like. Therefore, the construction requires a considerable amount of time, and the number of joints between the steel girders 4 and the steel girders 5 is large. In addition, when the steel girders 4 are erected, the steel girders 4 are provided by temporary materials such as supports. Because of the necessity of supporting, there is a problem that stability and construction accuracy at the time of erection are inferior and labor saving at the time of construction is generally difficult.

A method of directly mounting a steel beam 4 on the upper end surface of the column 1 without using the connecting member 3 is also known. Concrete is not sufficiently filled between the bottom surface of the steel girder 4 and the upper end surface of the column 1, and as a result, there is a problem that it is difficult to obtain a desired joint strength. The present invention has been made in order to effectively solve the problems of the above-described conventional method of constructing a composite frame, and has a small number of joints of steel beam girders, and does not require any erection material such as a shoring work at the time of erection. It is an object of the present invention to provide a method of constructing a composite frame capable of saving labor and improving stability and construction accuracy in the construction of a girder, and at the same time, obtaining a strong column-beam joint strength. .

[0005]

According to a first aspect of the present invention, there is provided a method for constructing a composite frame, comprising: firstly constructing an RC column; After installing the beam receiving members at both ends, the semi-PC girders that left the beam-column joints are erected in the other direction between the columns,
The length of at least one span between the columns, and the half PC
A steel girder with a smaller diameter than the girder is placed on the beam receiving member with its end positioned between the columns, thereby erection in one direction between the columns, and then the beam-column joint It is characterized by placing concrete of the upper end of the half PC beam and concrete of the floor slab.

According to a second aspect of the present invention, at the time of constructing the pillar according to the first aspect, the half-PC girders projecting from the pillar in the other direction at both ends of the upper surface in the other direction. And a receiving seat portion for supporting the end portion is formed integrally with the pillar. Further, the invention according to claim 3 is characterized in that in the invention according to claim 1 or 2, A unit in which a steel beam is joined in the other direction between the above-mentioned steel beams is manufactured, and the unit is installed in one direction between the columns.

[0007]

According to the first aspect of the present invention, the steel girders having a length of at least one span between the columns are erected in one direction with their ends positioned between the columns. The number of connection points on the steel girder is reduced as compared with the conventional one, and as a result, the labor required for connecting the steel girder is reduced. Also, since the steel girders are erected between the columns by placing them on beam receiving members installed on both ends of the upper surface of the columns, when concrete is cast at the column-beam joints, Is securely filled between the lower end surface of the steel girder and the upper surface of the column, and the steel girder is completely surrounded by the concrete.As a result, a strong column-beam joint is performed, and at the time of erection of the steel girder, No temporary materials such as shoring are required.

In addition, since the steel beam is set to be smaller than the half-PC beam, the upper ends of the steel beam and the half-PC beam can be easily aligned with each other. Further, since the semi-PC girders with the beam-column joints left behind in the other direction between the columns are erected, not only the high strength peculiar to the PC beams in the direction is obtained, but also the beam Eliminates the need for concrete casting work. As a result, in erection of the girder in both directions, labor saving of the construction, improvement of the stability and construction accuracy are achieved.

In this case, according to the second aspect of the present invention, when the half-PC girders are erected, the ends of the half-PC girders are supported by the receiving seats integrally formed at both ends of the upper surface of the pillar. This eliminates the need for a support or the like for supporting the half-PC girders, thereby saving labor in erection of the half-PC girders. Furthermore, according to the third aspect of the present invention, a unit composed of two or more steel girders and a steel girder between them is erected between the columns in a plurality of spans, so that the steel girder joints on site can be made. This eliminates the need for work, and as a result, further labor saving of work and shortening of the construction period are achieved.

[0010]

Embodiment 1 FIGS. 1 to 9 are for explaining a first embodiment of a method of constructing a composite frame according to the present invention with time.
Hereinafter, the one embodiment will be described with reference to these drawings. First, as shown in FIGS. 1 and 2, RC columns 10 are constructed at predetermined positions up to the lower end level of the beam.
The column main bars 12 project from 1. When constructing the RC column 10 by casting concrete, the R
On both sides in one direction where a steel girder of C column 10 should be erected,
From now on, beam receiving hardware (beam receiving members) 13 and 13 composed of channels protruding above the upper surface 11 will be installed, and at both ends of the upper surface 11 in the other direction from the RC column 11 by puffing concrete in the other direction. Are integrally formed. Then, as shown in FIG. 3 and FIG. 4, the lower joint 16 is projected from both end surfaces while leaving the beam joint unremoved, and the upper end portion 1 of the rib is formed on the upper surface.
Half PC girder 15 having a length of 1 span protruding 7
Is installed in the other direction between the RC columns 10 and 10. At this time, the end of the semi-PC girder 15 is connected to the RC column 1
0 is supported by the receiving seat 14 formed on the upper surface 11.

Next, as shown in FIGS. 5 and 6, in the one direction between the RC columns 10 and 10, a steel beam 18 made of H-section steel having a length of slightly more than 3 spans is placed at the end thereof. Part 1
It is mounted on the beam receiving hardware 13 so that 8a and 18a are located between the RC columns 10 and 10. As a result, the gap 1 corresponding to the height of the beam receiving hardware 13 is provided between the lower end surface of the steel beam 18 and the upper surface of the RC column 10.
9 is formed. The steel girder 18 is smaller than the half-PC girder 15 because of its size, and the dimensions of the beam receiving hardware 13 are the same as those of the steel girder 1.
The upper end surface of the large steel beam 18 and the upper end surface of the half PC beam 15 are set so as to be substantially flush with each other when the bridge 8 is mounted on the beam receiving hardware 13. In parallel with this, a small steel beam 20 made of H-section steel and having a span length is sequentially bridged in a predetermined position between the installed steel girders 18 in parallel with the half PC girders 15.

Next, as shown in FIGS. 7 and 8, a steel deck 21 is laid on the steel beam 20.
In parallel with this, a split mold 22 is constructed around the beam-column joint so as to surround it. Here, the back surface of the beam receiving hardware 13 composed of a channel is formed in the form 2
Define part of 2. And the steel deck 21
After the completion of the laying of the concrete, as shown in FIG. 9, concrete is preliminarily cast into the formwork 22 of the column-beam joint portion by the hopper 23, and then the floor slab 24 and the upper end of the semi-PC girders 15 are placed. Pump concrete. As a result, the construction of one layer is completed, and then the above steps are repeated to sequentially construct a multi-layered composite frame upward.

In the method of constructing a composite frame having such a structure, a steel girder 18 having a length of slightly more than 3 spans between RC columns 10 is provided.
10 so as to be located in one direction, so that the number of connection points between the steel girders is greatly reduced as compared with the conventional one, and the steel girders 18 are connected to the beam receiving hardware 13.
Since it is placed on the top, when the steel beam 18 is erected,
Since a temporary material such as a shoring is not required, the labor required for connecting the steel girders 18 can be greatly reduced.

In addition, beam receiving hardware 13 composed of a channel is installed on both sides of the upper surface 11 of the RC column 10, and the steel beam 18 is placed on the beam receiving hardware 13.
A part of the formwork 22 can be defined by the back surface of the beam receiving hardware 13, and the height dimension of the beam receiving hardware 13 is defined between the lower end surface of the steel beam 18 and the upper surface of the RC column 10. It is possible to form a gap portion 19 which does not obstruct the inflow of concrete when the concrete is poured. For this reason, when placing concrete at the beam-column joint, the lower end face of the steel beam 18 and the RC column 10
Concrete can be reliably filled between the steel beams and the upper surface 11, and the steel beam 18 can be completely surrounded by the concrete. Therefore, it is possible to join strong columns and beams. Moreover, since the steel beam 18 is set smaller than the half PC beam 15, the height of the beam receiving hardware 13 is appropriately set, so that the steel beam 18 and the half PC beam can be easily formed. Fifteen
And the upper end surfaces thereof can be matched.

Further, in another direction between the RC columns 10,
Since the half PC girders 15 with the column-beam joints left behind are erected, high strength peculiar to PC beams is obtained in this direction, and concrete casting work for constructing the girders at the site is not required. In addition, the upper surface 1 of the RC column 10
1 are formed integrally with both ends of the first PC, and the ends of the half-PC girders 15 are supported by the receiving seats 14. Therefore, when the half-PC girders 15 are erected, the half-PC girders 15 are supported. Therefore, it is not necessary to provide any support work, and thus it is possible to save labor even when the half-PC girder 15 is erected. Therefore, according to the method of constructing the composite frame,
When the half-PC girder 15 and the steel girder 18 are erected, it is possible to greatly reduce the labor required in both cases and to improve the stability and accuracy of construction.

[0016]

Embodiment 2 FIG. 10 shows a second embodiment of the method for constructing a composite frame according to the present invention. Other structures are the same as those shown in FIGS. 1 to 5 and FIGS. Since they are the same, the description thereof will be omitted using the drawings and the same reference numerals. In FIG. 10, the method of constructing a composite frame of this example is based on the premise that a plurality of (four in the drawing) are provided at predetermined positions between the steel girders 18, which have a length of slightly more than two three spans, in the other direction. A unit 25 to which the steel beams 20 are joined is manufactured in advance, and as shown in FIG. 4, after the half PC girders 15 are erected between the RC columns 10, the unit 25 is directly connected to the RC columns 10 in one direction. It is designed to be installed in

Therefore, according to the method of constructing the composite frame in the second embodiment, the same operation and effect as those in the first embodiment can be obtained. Since the bridges are sequentially installed, the joining work between the steel girders 18 and the steel girders 20 at the site is not required, so that it is possible to further reduce labor of the construction and shorten the construction period.

In the description of the second embodiment,
A unit 25 in which four steel beams 20 were jointed between two steel beams 18 was manufactured in advance, and this was directly installed between the RC columns. The size is not limited, and the size can be appropriately determined according to the loading capacity of a crane or the like that lifts the unit. In the first and second embodiments, the half-PC beam 1 having a length of one span is used.
Although the case where 5 is installed between the RC columns 10 has been described,
However, the present invention is not limited to this, and it is also possible to apply a long semi-PC giant beam having a length of 2 spans or longer and exposing the bottom streaks leaving the above-mentioned beam-column joint. It is.

[0019]

As described above, according to the first aspect of the present invention, the number of connecting portions between the steel girders is smaller than that of the conventional one, so that the labor required for connecting the steel girders is reduced. In addition to this, a strong connection of the column and beam is obtained, and it becomes easy to match the upper end surfaces of the steel beam and the semi-PC beam. In addition, when erection of steel beams, temporary materials such as shoring are not required.
Since high strength is obtained in the erection direction of the C beam, it is possible to generally save labor and improve stability and construction accuracy when constructing the composite frame.

According to the second aspect of the present invention, when the half-PC girders are erected, no support work or the like for supporting the half-PC girders is required. It is planned. Further, according to the third aspect of the present invention, the uniting of the steel girder and the steel girder eliminates the necessity of joining the steel girder on site, thereby further reducing the labor of the construction and shortening the construction period. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an RC column erected in a first embodiment of a method for constructing a composite frame according to the present invention.

FIG. 2 is an overall perspective view showing a state in which the RC columns of FIG. 1 are erected.

FIG. 3 is a perspective view of a main part showing a state where a half-PC beam is erected on the RC column of FIG. 1;

FIG. 4 is an overall perspective view of FIG. 3;

FIG. 5 is a perspective view of a main part showing a state where a steel girder is erected on the RC column of FIG. 3;

FIG. 6 is an overall perspective view of FIG. 5;

FIG. 7 is a perspective view of a main part showing a state in which a deck is laid around RC columns and beams in FIG. 3;

FIG. 8 is an overall perspective view of FIG. 7;

FIG. 9 is an overall perspective view showing a state where concrete is poured onto a deck or the like in FIG. 8;

FIG. 10 is an overall perspective view showing a state in which a steel frame unit is erected in the second embodiment of the method for constructing a composite frame according to the present invention.

FIG. 11 is a plan view showing a schematic configuration of a conventional composite frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 RC column 11 Upper surface 13 Beam receiving hardware (beam receiving member) 14 Receiving seat part 15 Half PC beam 18 Steel frame beam 18a End 19 Gap 20 Steel beam 22 Formwork 24 Floor slab 25 unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/16

Claims (3)

(57) [Claims] After constructing a reinforced concrete column and installing beam receiving members at both ends in one direction of the upper surface of the column, a semi-precast girder that has left a beam-column joint is removed by another beam between the columns. A steel girder having a length of at least 1 span between the columns and smaller than the semi-precast girder, with its end positioned between the columns and on the beam receiving member. A method for constructing a composite frame, comprising placing the concrete in the column-beam joint, the upper end of the semi-precast girders and the floor slab by placing the concrete in the one direction between the columns. 2. When the column is constructed, receiving seats projecting from the column in the other direction and supporting the ends of the semi-precast girders are integrated with the column at both ends of the upper surface in the other direction. The method for constructing a composite frame according to claim 1, wherein the composite frame is formed. 3. A unit in which a steel beam is joined in the other direction between two or more of said steel beams in advance, and said unit is erected in one direction between said columns. Item 3. The method for constructing a composite frame according to item 1 or 2.