JP2008031644A - Floor frame of steel frame building and construction method of this floor frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a floor frame of particularly a steel frame building, and a construction method of the floor frame. <P>SOLUTION: A steel frame girder 2 is composed of three pieces in total of one central steel frame beam 2a inserted into a column central position and two outside steel frame beams 2b arranged in parallel at an interval on its both sides. A beam joining bracket 5 of a structure capable of transmitting respective stresses of the three steel frame beams 2a and 2b to a steel frame column, is arranged in a girder installing position of the steel frame column 1. The steel frame girder 2 performs column-beam joining in which the three steel frame beams 2a and 2b are joined as one set with the bracket 5 of the steel frame column 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 is composed of a total of three steel beams, one central steel beam 2a passed through the center of the column and two outer steel beams 2b, 2b arranged in parallel at intervals on both sides thereof. ,
At the position where the steel column 1 is attached, 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.
The steel large beam 2 is characterized in that column beam joining is performed by joining the three steel beam beams 2a and 2b to the bracket 5 of the steel column 1 as a set.

The invention described in claim 2 is the floor frame of the steel structure building described in claim 1,
The steel large beam 2 composed of a total of three steel beams 2a and 2b is divided into three steel beams 2a and 2b at the joint ends 7 of the cross-connecting member 6 and the small beam 8 at important points spaced in the axial direction. It is characterized by being configured to be integrally rigidly connected to each other.

The invention described in claim 3 is the floor frame of the steel structure building described in claim 1 or 2,
A total of three steel beams 2a and 2b constituting the steel beam 2 are characterized in that the same beam and three beams are configured to exhibit performance as a unit.

The invention described in claim 4 is the floor structure of the steel structure building described in claim 1,
The beam connecting bracket 5 of the steel column 1 is composed of a large through diaphragm 50 and has three vertical ribs at positions where the steel beams 2a and 2b at the center position and the outer positions of the steel beam 2 are bonded. 5a and 5b, and two or more longitudinal ribs 5c that transmit the stresses of the steel beams 2b and 2b on both outer sides to the column 1 are provided in an arrangement perpendicular to the axial direction of the steel beam 2. .

The floor frame construction method for a steel building according to the invention described in claim 5 is:
The steel column 1 provided with the beam connecting bracket 5 is built at the position where the large beam is mounted, and the main points of the three steel beams 2a and 2b are integrally connected to each other by the horizontal connecting material 6 on the upper surface of the steel beam 2 Joining a steel beam unit P formed by laying and integrating a deck plate or a precast floor plate to the bracket 5 of the steel column 1;
A beam unit Q, which is integrated by placing a deck plate or a precast floor plate on the upper surface of the beam 8, is joined to the beam end 7 provided on the steel beam 2 and installed. Installation stage,
Placing other required deck plates or precast floorboards on the beams, placing stats on top of each steel beam, placing slab bars on the deck plates or precast floorboards, and placing floor concrete It is characterized by comprising.

Since the floor frame of the inventions according to claims 1 to 4 uses steel beams 2a and 2b having low existing faults for the steel beam 2, it is within a limited range of floor height by the amount of lower beam faults. The space height that can be used freely can be expanded, or the field of view can be expanded to ensure a sense of openness. 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 cross-sectional performance of the steel beam 2 using the low-profile steel beams 2a and 2b is sufficiently and sufficiently supplemented by the combined effect of using the three steel beams 2a and 2b in parallel as a set. And since an existing H-section steel can be used, it can implement at low cost. In addition, since the steel beam 2 can be joined to the bracket 5 of the steel column 1 at a common position, it can be easily carried out by a conventional simple column beam joining technique.

The building construction method of the invention according to claim 5 is to realize a safe and quick building construction by reducing the number of man-hours for building construction at the site by partially manufacturing each component of the floor frame as a unit. Contribute. Specifically, by constructing a unit P in which the deck plate or precast floor plate is laid on the upper surface of the steel beam 2 and integrated, the steel beam 2 is sufficiently wide at the stage where the steel beam 2 is joined to the bracket 5 of the column 1. The 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, the floor structure of a steel structure building and its construction method according to the present invention are convenient for the construction and extension of artificial ground and buildings that utilize the space on the track where the railway station and the like exist.

The steel large beam 2 is composed of a total of three steel beams, one central steel beam 2a passed through the column center position and two outer steel beams 2b and 2b arranged at intervals on both side positions.
At the beam mounting position of the steel column 1, a beam joining bracket 5 having a structure capable of transmitting the stress of each of the three steel beams 2 a and 2 b to the steel column 1 is installed. And the steel large beam 2 which makes the said three steel beam 2a, 2b 1 set performs column beam joining which joins with the said bracket 5 of the steel column 1. FIG.
As the building construction method, first, the steel column 1 provided with the beam joining bracket 5 is built at the beam mounting position. The steel girder 2 is constructed as a steel girder unit P in which the important points of the three steel beams 2a and 2b are integrally rigidly connected to each other by a horizontal connecting material 6 and a deck plate or precast floorboard is laid on the upper surface. Then, this is joined to the bracket 5 of the steel column 1. Next, the beam unit Q integrated by placing a deck plate or a precast floor plate on the upper surface of the beam 8 is joined to the beam end 7 provided on the steel beam 2. Further, the necessary grandchild beam 9 is attached as a unit R integrated with a deck plate or a precast floor plate. Other necessary deck plates or precast floor boards are laid on the steel beams, stats are placed on the upper surface of each steel beam, slab bars are placed on the deck plates or the precast floor boards, and floor concrete is placed.

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 working scaffold and 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 portion 7 of the steel large beam 2, the deck plate or precast floor plate can be used as a working scaffold.
The other beam 8 is 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.
If unitization of each element constituting the floor frame is promoted as described above, each unit P, Q, and R can be easily made into a factory, and quality can be improved and manpower for field work can be saved. 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 (5)

In the floor structure of a steel building composed of steel columns and steel beams,
The steel beam is composed of a total of three steel beams, one central steel beam passed through the center of the column and two outer steel beams arranged in parallel at intervals on both sides.
At the position where the steel beam is attached to the large beam, there is a beam connecting bracket that can transmit the stress of each of the three steel beams to the column.
The steel frame is a floor structure of a steel building, in which the three steel beams are joined to each other to join the bracket of the steel column as a set.   A steel beam composed of a total of three steel beams is composed of three steel beams that are rigidly connected to each other at the junction between the horizontal connecting material and the small beam at important points spaced in the axial direction. The floor structure of a steel structure building according to claim 1, wherein   The floor of a steel structure building according to claim 1 or 2, wherein a total of three steel beams constituting the steel beam are configured so that the same beam and three are integrated to exhibit performance. Frame.   The steel column beam joint bracket is composed of a large through-diaphragm, and has three vertical ribs at the center and the outer side of the steel beam that are connected to the steel beam web. The floor structure of a steel structure building according to claim 1, wherein two or more vertical ribs for transmitting the stress of the steel beam to the column are provided in an arrangement perpendicular to the axial direction of the steel beam. Build a steel column with a beam-joining bracket at the beam mounting position,
A steel beam unit that is formed by laying a deck plate or precast floor plate on the upper surface of a steel beam that is rigidly connected to each other by laterally connecting the important points of the three steel beams and joining the steel column bracket And the stage of
A step of installing a beam unit integrated with a deck plate or a precast floor plate on the upper surface of the beam, which is joined to the end of the beam provided on the steel beam, and further attaching a necessary grandchild beam;
Placing the required deck plate or precast floorboard on the beam, placing a stat gibel on the upper surface of each steel beam, placing slab bars on the deck plate or precast floorboard, and placing floor concrete A floor frame construction method for a steel structure, characterized by comprising:

Images