JP4964528B2 - Floor structure of steel structure building and construction method of floor structure - Google Patents

Description

  The present invention belongs to the technical field of the structure of a steel frame structure, in particular, the structure of a floor frame and the construction method of the floor frame.

Buildings are built under various spatial constraints. Therefore, securing the maximum space economically under such constraints is an important issue in structural design. In order to increase the space that can be freely used in a limited height range, it is necessary to compress the “sei” by making the floor structure as flat (thin) as possible.
Based on this idea, in the case of a reinforced concrete structure, it is known to deal with building a so-called flat slab structure building. However, for the construction work of a reinforced concrete structure building, it is essential to use a support that supports the concrete formwork.

Therefore, when there is a spatial constraint and it is difficult or impossible to use a support, it is required to implement a steel structure that can construct a structure without support. As a specific example, when a building is built across a railway line existing in a station building or the like, it is extremely difficult to use a support work and it is impossible to adopt a reinforced concrete structure. In addition, even when a steel structure is adopted, it is required to design and construct a floor frame that does not obstruct existing buildings.
Even in the case of ordinary steel-framed buildings, in order to increase the space height that can be freely used within the limited floor height range or to widen the field of view and ensure a sense of openness, the floor structure is eventually constructed. There is no other way but to reduce the beam as much as possible.

  As a means to realize a flat floor structure for steel-framed buildings, a structure in which a large beam is manufactured as an assembled H-shaped beam and the flange width is greatly expanded or the flange plate thickness is increased is used. It is to ensure the cross-sectional performance that compensates for the reduction of the cause. However, this method results in a very uneconomic cross section due to structural design rules in the cross section design.

Conventionally, a building frame having a double beam structure in which two large beams are connected in parallel to one column is disclosed in Patent Document 1 below.
However, the invention according to Patent Document 1 has been made mainly for the purpose of exhibiting high earthquake resistance and reducing the total weight of the beam. Moreover, the specific configuration is that, of two double beams to be bonded to one column, the end of one beam is bonded to a beam that crosses the position on the near side of the column in the direction perpendicular to the column. . The other one end of the beam passes through a beam that crosses the position in front of the column in a right angle direction, and is joined to a beam that crosses the back side of the column in a right angle direction. In this way, the positions of the joint ends of each pair of beams with respect to the columns are staggered, so the joints of the column beam joints have a very complicated structure, and it is recognized that the joining work is troublesome and requires a long time.

Japanese Patent Laid-Open No. 10-8552 (Patent No. 3516197)

An object of the present invention is to realize a flat floor structure of a steel structure building. More specifically, within a limited range of floor heights, the floor height that can be used freely is expanded, or the floor structure that is useful for widening the field of view and ensuring a sense of openness is realized. That is.
The object of the present invention is to use a steel beam, an existing inexpensive H-section steel, to make up for the deficiency in strength and rigidity by increasing the number of H-section steels. It is to provide a steel frame building floor structure that can be joined together.

The next object of the present invention is to realize safe and rapid construction work, specifically, to make it easy to secure the work path on the site by partially manufacturing the steel frame components as a unit. Another object of the present invention is to provide a steel frame floor structure and a construction method thereof, which are highly safe in work and capable of proceeding with the construction of a floor frame without supporting work.
It is a further object of the present invention to provide a steel frame floor structure that is convenient for construction and extension of artificial ground and buildings that utilize existing space on railway tracks and the like, and a construction method thereof. .

As means for solving the above-described problems of the prior art, the floor structure of a steel structure building according to the invention described in claim 1 is:
In the floor structure of a steel building composed of steel columns and steel beams,
The steel beam 2 has a total of three steel beams, one central steel beam 2a passed through the central position of the steel column and two outer steel beams 2b and 2b arranged parallel to each other on both sides thereof. The three steel beams 2a and 2b are assumed to be the same beam , and the three steel beams 2a and 2b are connected to each other with the horizontal connecting member 6 and the end portion 7 of the small beam at the axially spaced points. The three are integrally rigidly connected to each other, and the three are configured to exhibit performance as a unit,
A beam joining bracket 5 having a structure capable of transmitting the stress of each of the three steel beams 2a and 2b to the steel column 1 is installed at the position where the steel beam 1 is attached to the large beam . The bracket 5 includes a through diaphragm 50, and includes three vertical ribs 5a and 5b at positions where the steel beams 2a and 2b at the center position and the outer positions of the steel beam 2 are joined. At least two longitudinal ribs 5c for transmitting the stress of the outer steel beams 2b, 2b to the steel column 1 in an arrangement perpendicular to the axial direction of the steel beam 2;
The steel beam 2 is characterized in that the three steel beams 2a and 2b are combined as a pair and the beam- to- beam connection is performed by joining the steel beam column 1 to the beam joining bracket 5.

The floor frame construction method for a steel building according to the invention described in claim 2 is:
It is composed of a total of three, one central steel beam 2a passed through the center position of the steel column 1 and two outer steel beams 2b, 2b arranged in parallel with a gap on both sides thereof, The three steel beams 2a and 2b are assumed to be the same beam, and the three steel beams 2a and 2b are integrated with each other with the laterally connecting material 6 and the end portion 7 of the beam at the important points spaced in the axial direction. Assembling the steel beam 2 having a structure in which the three are united together and exhibit performance as a unit ,
It is composed of a through diaphragm 50 capable of transmitting the stress of each of the three steel beams 2a, 2b to the steel column 1, and the steel beams 2a, 2b at the central position and the outer positions of the steel large beam 2 are arranged. Three longitudinal ribs 5a and 5b are provided at positions to be joined to the web, and the longitudinal rib 5c for transmitting the stress of the steel beams 2b and 2b on both outer sides to the steel column 1 is perpendicular to the axial direction of the steel beam 2 Building a steel column 1 in which at least two beam-joining brackets 5 having a structure for installation are provided at the position where the steel column 1 is attached to the large beam;
Joining the steel beam unit P, which is formed by laying and integrating a deck plate or a precast floor plate on the upper surface of the steel beam 2 to the beam connecting bracket 5 of the steel column 1;
The joists unit Q integrated with the upper surface of the joists 8 laying the deck plate or precast floor, installed by joining the small beam end portion 7 provided on the steel girder 2, further attach the Magohari 9 Stages,
Other deck plate or pre-cast floor is required for laying on the beam, the upper surface to hit the stat dowel of each steel beam, for pouring the floor concrete and Haisuji slab muscle to the deck plate or on precast floor It consists of stages.

The floor structure of the steel structure building according to the invention described in claim 1 is limited by the amount of lower beam seismicity because three steel beams 2a and 2b having lower precastness are used for the steel beam 2 The space height that can be freely used within the range of the floor height can be expanded, or the field of view can be expanded to ensure a feeling of opening. Furthermore, it is possible to increase the number of floors of a building when there is a height restriction in city planning.
On the other hand, the lower steel beams 2a sexually, sectional performance of steel girder 2 using 2b is three steel beams 2a, supplemented as required sufficient synthesis effect used in parallel 2b as a pair. And since an existing H-section steel can be used, it can implement at low cost. Moreover, since the steel large beam 2 can be joined to the common position with respect to the beam joining bracket 5 of the steel column 1, it can be easily carried out by a conventional simple column beam joining technique.

The floor frame construction method for a steel structure building according to the invention described in claim 2 is a method in which each component of the floor frame is partly unitized and manufactured in a factory, thereby reducing the number of man-hours for building construction on site and ensuring safety. Contributes to the realization of rapid construction work. More specifically, by constructing a unit P in which a deck plate or a precast floor plate is laid on the upper surface of the steel beam 2 and integrated, the steel beam 2 is sufficiently joined at the stage where the beam connection bracket 5 of the column 1 is bonded. A wide work path can be secured in advance, and work safety can be improved. Other floor frame elements are united with deck plates or precast floorboards, so construction work can proceed without support.
Therefore, floor racks 構建 Built Construction of steel frame buildings of the present invention, it is advantageous to, such as construction and build-of artificial ground and buildings to take advantage of the space on the track railway station building or the like is extant.

The steel frame 2 of the floor frame is composed of one central steel beam 2a passed through the central position of the steel column and two outer steel beams 2b and 2b arranged in parallel at intervals on both sides thereof. The three steel beams 2a and 2b are made of the same beam, and the three steel beams are arranged at the important points spaced apart in the axial direction with the horizontal connecting member 6 and the end portion 7 of the small beam. 2a and 2b are integrally rigidly connected to each other, and the three are integrated to exhibit performance.
A beam joining bracket 5 having a structure capable of transmitting the stress of each of the three steel beams 2a and 2b to the steel column 1 is installed at a position where the steel beam 1 is attached to the large beam. The bracket 5 is composed of a large through diaphragm 50 and includes three vertical ribs 5a and 5b at positions where the steel beams 2a and 2b at the center position and the outer positions of the steel beam 2 are joined. Further, at least two longitudinal ribs 5c for transmitting the stresses of the steel beams 2b and 2b on the outer sides to the steel column 1 are provided in an arrangement perpendicular to the axial direction of the steel beam 2.
Steel girders 2, the three steel beams 2a, 2b Column junctions joining the pair to said beam joining bracket 5 of steel columns 1 are carried out.
Floor Frames building construction methods may include the steps of Ru built steel columns 1 First the girder mounting position provided Beam bracket 5 of the above configuration,
The central steel beam 1 is composed of a total of three steel beams, one central steel beam 2a passing through the central position of the steel column 1 and two outer steel beams 2b and 2b arranged in parallel at intervals on both sides thereof. The three steel beams 2a and 2b are assumed to be the same beam, and the three steel beams 2a and 2b are integrated with each other by the laterally connecting material 6 and the end portion 7 of the small beam at the axially spaced points. Assembling the steel beam 2 which is rigidly coupled to each other and has a structure in which the three members perform as a unit ,
The steel girder unit P formed by integrally laying deck plate or precast floor on the upper surface of the steel girder 2, the steps of bonding the beam joining bracket 5 of the steel columns 1,
Stage the joists units Q which is integrally covered with the deck plate or precast floor to the upper surface of the joists 8, the steel girders placed bonded to the small beam end portion 7 provided on 2, further attach the grandchild beam When,
Other deck plate or pre-cast floor is required for laying on the beam, the upper surface to hit the stat dowel of each steel beam, for pouring the floor concrete and Haisuji slab muscle to the deck plate or on precast floor And consists of stages .

In the following, the present invention will be described with reference to illustrated embodiments.
FIG. 1 shows an embodiment of a floor structure of a steel building according to the present invention as a face-down view. Reference numeral 1 denotes a steel column made of a square steel pipe, and 2 denotes a steel beam. As shown in FIGS. 2A and 3 in an enlarged manner, this steel beam is composed of one central steel beam 2a that passes through the center of the column and two wires that are arranged on both sides with an interval of about 300 mm. The outer steel beams 2b and 2b are three in total. For these three steel beams 2a and 2b, H-shaped steels of the same shape and the same size are used. More specifically, as one example, the three steel beams 2a and 2b employ a pre-made H-shaped steel having a flange width and beam length of 400 mm. In this way, the steel beam 2 composed of three H-shaped steels is a cross section of a beam (for example, 800 mm) which is usually used as a steel beam in consideration of the combined effect of the three steel beams 2a, 2b and 2b. Designed and implemented to exceed performance. The three steel beams with the low beam (400 mm) are all formed of the same beam. Incidentally, the thickness of the flange is 21 mm, and the thickness of the web is 13 mm.

In addition, the steel beam 3 at the outer peripheral position in FIG. 1 has a configuration in which the two steel beams 3a and 3a made of the above-described H-shaped steel having a flange width and beam length of 400 mm are arranged in parallel at a narrow interval of about 100 mm. Has been. On the other hand, for the girder girder 4 arranged in the vertical direction in FIG. 1, an assembled H-section steel having a flange width of 500 mm, a flange thickness of 28 mm, and a web thickness of 16 mm is used. ing.
Thus, the steel beams 2, 3, and 4 constituting the floor structure of this steel frame building are all standardized to 400 mm as an example.

  Of the steel columns described above, the three steel beams 2a, 2b, and 2b constituting the steel large beam 2 are joined to the beam mounting position of the middle column 1 to connect the three steel beams 2a, 2b, and 2b, respectively. A beam joining bracket 5 having a structure capable of transmitting the above stress to the column 1 is installed. Three steel beams 2a, 2b, 2b constituting the steel large beam 2 are joined to the beam bonding bracket 5 as a set by column beams.

  Incidentally, the beam joining bracket 5 of each steel column 1 shown in FIG. 1 and FIG. 2 is configured with large through diaphragms 50 and 50 at the upper and lower flange joints, and the central steel beam 2a and It is set as the structure provided with the three vertical ribs 5a and 5b, 5b by the vertical arrangement | positioning joined with the web of the steel beam 2b, 2b of both outer sides. Further, in order to transmit the stress of the steel beams 5b and 5b on both outer sides off the center of the column 1 to the column 1, at least two vertical ribs 5c and 5c are connected to the web position of the orthogonal beam 4 and the column 1 It is set as the structure equipped with the arrangement | positioning at right angles to the axial direction of the said steel-frame large beam 2 in two places of the position which left | separated from and was approached to the joining side of the large beam 2. FIG.

In the case of FIGS. 2A and 2B, the bracket 5 for joining the beam of the steel column 1 and the steel beams 2a, 2b, 2b constituting the steel large beam 2 are joined together with bolts (high strength) using splice plates for both the flange and the web. Including bolt joints, the same shall apply hereinafter). However, this is not restrictive, and the flange can be welded.
Incidentally, FIG. 3 shows a bird's-eye view of the part (FIGS. 2A and 2B) where the beam is joined as described above.

As is apparent from FIG. 2A, an interval m of about 300 mm is provided between the three steel beams 2a, 2b, and 2b constituting the steel beam 2. The reason why the interval m is provided is that it is necessary for inserting the operator's hand and a tool such as a wrench or enabling visual confirmation during the bolt joining operation. In particular, the above-mentioned distance m is indispensable for bolting the web of the steel beam 2a at the center position.
In that sense, the reason is that the steel beam 3 at the outer peripheral position in FIG. 1 has two steel beams 3a and 3a arranged in parallel at a narrow interval of about 100 mm. This is because there is no need for an interval (work space) for inserting a wrench for bolting the steel web.
As shown in FIG. 1, the beam joining bracket 10 of the outer circumferential steel column 1 ′ that joins the outer steel beam 3 at the outer circumferential position includes two steel frames in which the outer steel beam 3 at the outer circumferential position is arranged in parallel at a narrow interval. Since it is composed of the beams 3a and 3a, it is narrower and smaller than the beam joining bracket 5 of the steel column 1 of the column row belt.

Note that the beam-jointing brackets 5 and 10 of the steel columns 1 and 1 ′ are not limited to the structure of the above-described through diaphragm 50 and the vertical ribs 5a and 5b.
The two steel beams 3a, 3a in total or the steel large beams 3, which are composed of the three steel beams 2a and 2b, 2b, and the same shape as the two or three beams arranged in the same manner as the respective steel beams. The same configuration can be implemented with a structure in which H-section steel with the same cross section is assembled in a cross-beam shape.

Next, in the embodiment of FIG. 1, the steel beam 2 composed of a total of three steel beams 2a, 2b and 2b can be handled as a single material by adding the rigidity of the three beams. The central part between the columns is integrally and rigidly connected to each other by the horizontal connecting material 6. Further, the end portion 7 of the beam is joined to the position where the beam 8 is to be bridged, and it is also configured to be integrally rigidly connected to each other. Note that the two steel beams 3a, 3a constituting the outer large beam steel frame 3 are configured to be integrally rigidly joined, for example, by welding at positions spaced apart by a certain distance.
In the case of FIG. 1, a configuration in which a grandchild beam 9 is provided between the small beams 8 and 8 as necessary is shown. Incidentally, the small beam 8 is made of H-shaped steel having a flange width and a beam length of about 400 mm. For the grandchild beam 9, an H-shaped steel having a flange width of 300 mm and a beam bar of about 390 mm is used.

Next, FIG. 4 shows a main part of Example 2 having a different structure of the floor structure of the steel structure building according to the present invention as a bottom view.
In the case of the second embodiment as well, there is no change in the configuration in which a steel beam composed of a total of three steel beams is used for the steel beam 2 but a set of two steel beams as the small beam 8 is set at a constant interval. It is characterized by a structure of double beams arranged in parallel with the doors installed in the center between the columns. A grandchild beam 9 is installed between the small beam 8 and the large beam 2. The three steel beams constituting the steel large beam 2 are configured to be integrally rigidly connected to each other by a small beam end portion 7 prepared for joining the double small beams 8 and 8.

The point that is particularly desired to be described in the second embodiment shown in FIG. 4 is the unitization method of each element constituting the floor frame. First, the steel beam 2 is a deck plate or a precast on the upper surface of the structure in which the beam ends 7 (including the case of the horizontal connecting member 6 shown in the first embodiment) are rigidly connected to each other. It is configured as a steel beam unit P integrated with a floor board (not shown). Therefore, when this steel beam unit P is bridged between the steel columns 1 and 1 and joined to the beam joining bracket 5, the deck plate or the precast floor board can be immediately used as a work scaffold or a passage.
Similarly, the above-mentioned double beam 8 and 8 have a structure in which the central part is rigidly connected like a cross beam at the beam end 7 ', and a deck plate or a precast floor panel (not shown) is laid on the upper surface to integrate. This is configured as a small beam unit Q. Therefore, as soon as this small beam unit Q is joined to the small beam end 7 of the steel large beam 2, the deck plate or the precast floor plate can be used as a working scaffold.
The other small beams 8 are also configured as a unit integrated with a deck plate or a precast floor plate (not shown), and each joining operation is performed. FIG. 4 shows an example in which the steel beam 2 is configured as a small beam unit member R.
When the unitization of each element constituting the floor frame is promoted as described above, it becomes easy to make each unit P, Q, and R into a factory, thereby improving quality and saving man-hours for field work. The construction period can be shortened.

As is apparent from the description of the unitization of the floor frame in the embodiment of FIG. 4 described above, the construction method of the invention according to claim 5 is a steel column 1 in which a beam connecting bracket 5 is first provided at a beam mounting position. To start building.
Next, an end portion 7 for joining a small beam is provided on a steel beam 2 composed of a total of three steel beams 2a and 2b, and a steel beam unit P is formed by integrating a deck plate or a precast floor plate on the upper surface. The bracket 5 of the steel column 1 and the steel beam 2 are joined to each other.
The small beam 8 constitutes an integrated small beam unit Q by laying a deck plate or a precast floor plate on the upper surface thereof, and is joined between the steel large beams 2 and 2 using a small beam joint 7. Install.
The other required grandchild beam 9 is also configured as an integrated grandchild beam unit R by laying a deck plate or a precast floor board, and is attached by beam joining using the grandchild beam joint portion 9 '. Furthermore, the necessary deck plate or precast floor slab is laid on the beam, stats are placed on the upper surface of each steel beam, slab bars are placed, and floor concrete is placed. The floor frame is constructed.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the above embodiment. The present invention can be implemented in various ways in design changes, modifications, and applications that are made by those skilled in the art as needed without departing from the spirit and technical idea of the present invention. Insist.

It is a top view (downturn view) which shows notionally the floor frame of the present invention. A and B are a plan view and a vertical view showing a joint structure of a steel beam and a steel column. It is a perspective view which shows the beam-column joining structure of FIG. 2A. It is a top view (downturn view) which shows notionally different examples of the floor frame of the present invention.

Explanation of symbols

1 Steel column 2 Steel girder 3 Steel girder 4 Girder girder 5 Bracket 6 Lateral joint 7 Small beam end 9 Grandchild 10 Bracket P, Q, R Beam unit 50 Through diaphragm 5a, 5b, 5c Vertical rib

Claims (2)

In the floor structure of a steel building composed of steel columns and steel beams,
Steel girders are one and the central steel beam that passed through the center position of the steel column is composed of a total of three and two outer steel beam which is parallel to spaced apart on both sides, the The three steel beams are assumed to be the same beam, and the three steel beams are integrally rigidly connected to each other at the ends of the small beams by connecting the main points spaced apart in the axial direction. It is configured to perform as a unit,
At the mounting position of the steel column, a beam joint bracket is installed that can transmit the stress of each of the three steel beams to the steel column. The beam joint bracket is made up of a through diaphragm. Three longitudinal ribs are provided at positions where the steel beam is joined to the central beam and the outer steel beam webs constituting the steel beam, and further, the vertical ribs for transmitting the stresses of the outer steel beams to the steel column are provided. Having at least two pieces arranged in a direction perpendicular to the axial direction of the steel beam.
Steel girders are characterized in that beam-column joint joined to the beam joining bracket steel columns has been performed the three steel beams as a set, Steel Building floor Frames. The three steel beams are composed of a total of three steel beams, one central steel beam passed through the center position of the steel column and two outer steel beams arranged in parallel at intervals on both sides thereof. Is the same beam, and three steel beams are rigidly connected to each other at the ends of the beam and the ends of the small beams at the important points spaced in the axial direction. Assembling a steel beam with a structure to
The three steel beams are composed of through-diaphragms capable of transmitting the stress of each of the steel beams to the steel column, and three at positions where the steel beams are joined to the steel beam webs at the central position and both outer positions. Of the steel column, and a beam connecting bracket having a structure in which at least two vertical ribs that transmit the stresses of the steel beams on both outer sides to the steel column are provided at right angles to the axial direction of the steel beam. The stage of building a steel column provided at the mounting position;
A step of joining a steel beam unit composed of a deck plate or a precast floor plate integrated on the upper surface of the steel beam, and a beam connecting bracket of the steel column; and
The joists unit that integrates laying the deck plate or precast floor to the upper surface of the joists, the installed bonded to the steel girders in the small beam end provided, comprising the steps of attaching a Magohari in further,
Other deck plate or pre-cast floor is required for laying on the beam, the upper surface to hit the stat dowel of each steel beam, for pouring the floor concrete and Haisuji slab muscle to the deck plate or on precast floor A floor frame construction method for steel-framed buildings, characterized by comprising stages.

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