JP7580207B2 - Column and beam structure - Google Patents

Description

The present invention relates to a column-beam structure.

For buildings with large span structures such as single-story factories, rigid frame structures are often used (see, for example, Patent Documents 1 and 2).

JP 2020-37774 A JP 2019-196637 A

However, if you use a rigid frame structure with steel columns and steel beams, it takes a lot of work to process the steel frame to rigidly connect the beams to the columns.

In addition, when creating a rigid frame structure with reinforced concrete columns and steel beams, embedding the beams in the columns and rigidly joining them to the columns requires joining beams in two directions, and the construction work of embedding these beams in the concrete of the columns is time-consuming. In addition, the method of placing the beam end on a top plate installed on the upper surface of the column capital and welding the beam end to the top plate is not suitable for large span beams because the beam end is pin-jointed.

Taking the above facts into consideration, the present invention aims to simplify the joint structure between columns and beams and improve the workability of column-beam structures.

The column-beam structure described in claim 1 has a column erected on a support structure, a first steel beam that is spanned and joined to the top of the column and arranged in one direction, and a second steel beam that is spanned and joined to the top surface of the first steel beam so as to intersect with the first steel beam.

According to the column-beam structure of claim 1, the first steel beam arranged in one direction is spanned and joined to the head of the column erected on the support structure.

This simplifies the joint structure between the column and the first steel beam by simply placing the first steel beam on the top of the column and joining it, reducing the amount of work required to process the column and the first steel beam to form the joint structure and improving the ease of construction of the column-beam structure.

In addition, because the first steel beam acts as if it were rigidly connected to the column against vertical loads, a beam with a larger span can be constructed compared to a joint structure in which the beam is pin-connected to the column.

Furthermore, in conventional joint structures where a steel beam is joined to a beam bracket that protrudes from a column, the joint position is determined by the length of the beam bracket, but in this column-beam structure, the joint position of the first steel beam can be set to a position with low stress. This makes it possible to simplify the joint structure of the first steel beam and significantly reduce the cross section of the middle part of the span of the first steel beam.

In addition, according to the column-beam structure of claim 1, the second steel beam is joined to the top surface of the first steel beam so as to intersect with the first steel beam.

This simplifies the joint structure between the first steel beam and the second steel beam by simply placing the second steel beam on top of the first steel beam and joining it, reducing the effort required for steel processing on the first steel beam and the second steel beam to form the joint structure and improving the ease of construction of the column-beam structure.

The second steel beam is also placed continuously across the first steel beam, so it acts as if it is rigidly connected to the first steel beam. This allows the cross section of the second steel beam to be smaller, and the amount of steel required to be reduced.

Furthermore, according to the column-beam structure of claim 1, a first steel beam is placed on and joined to the top of the column, and a second steel beam is placed on and joined to the top surface of the first steel beam, forming a layered structure in which the column, first steel beam, and second steel beam are stacked in this order.

This will improve the efficiency of column-beam construction, shortening construction time and reducing the number of workers required.

The column-beam structure described in claim 2 is the column-beam structure described in claim 1, in which the columns are made of precast concrete.

According to the column-beam structure of claim 2, the columns are made of precast concrete.

This reduces the amount of work required to construct columns at the construction site, further improving the ease of construction of column-beam structures.

The column-beam structure described in claim 3 is the column-beam structure described in claim 1 or claim 2, in which the first steel beam has a beam end member and a beam intermediate member having a beam thickness smaller than that of the beam end member.

According to the column-beam structure of claim 3, the first steel beam has a beam end member and a beam intermediate member having a beam thickness smaller than that of the beam end member.

This allows the first steel beam to be constructed using a smaller amount of steel.

As described above, the column-beam structure of the present invention can improve the ease of construction by simplifying the joint structure between the columns and beams.

1 is a perspective view showing a building to which a column-beam frame according to an embodiment is applied. FIG. 1 is a side view showing a building to which a column-beam frame according to an embodiment is applied. FIG. 3 is a front view showing the joint structure between the column and the girder shown in FIG. 2 . This is a cross-sectional view taken along line 4-4 of Figure 3. FIG. 3 is a side view showing the joint structure between the column and the girder shown in FIG. 2 . 3 is a side view showing a joint structure between a beam end member and a beam intermediate member of the main girder shown in FIG. 2. [0023] FIG. FIG. 1 is a front view showing a conventional joint structure between a beam flange and a sub-beam. FIG. 2 is a front view showing a joint structure between the small beams shown in FIG. 1 .

Below, we will explain one embodiment of the column-beam structure with reference to the drawings.

(Column and beam structure)
1 shows a building 12 to which a column-beam frame 10 according to this embodiment is applied. Note that an arrow X shown in each drawing indicates a beam direction of the building 12 (hereinafter referred to as "beam direction X"), and an arrow Y indicates a girder direction of the building 12 that is perpendicular to the arrow X in a plan view (hereinafter referred to as "girder direction Y").

As shown in Figure 1, the building 12 is a one-story factory with a large span structure, and is built on a mat slab 14 as a supporting structure that constitutes a spread foundation. As shown in Figure 2, the mat slab 14 is built on a surface layer 18 formed on a supporting ground 16.

As shown in Figures 1 and 2, the column-beam structure 10 is composed of a column 20, a main beam 22 as a first steel beam, and a sub-beam 24 as a second steel beam. The main beam 22 and the sub-beam 24 are composed of H-shaped steel.

The columns 20 are made of precast concrete and stand on a mat slab 14 that is poured on rubble concrete 26 that is laid on the supporting ground 16. The columns 20 are made of strong members that can bear the seismic force (horizontal force) that occurs in the building 12 as a cantilever column.

As shown in FIG. 1, all of the girders 22 are arranged in one direction, the span direction X, and are arranged parallel to each other at a predetermined interval in the row direction Y.

As shown in Figures 3, 4 and 5, the girder 22 is placed on the upper surface of the column capital 28, which serves as the head of the column 20. The girder 22 is joined to the column capital 28 of the column 20 by bolting a base plate 34, which is provided integrally with the lower flange 32 on both outer sides of the lower flange 32 of the girder 22, with an anchor bolt 30 provided on the column capital 28 and protruding upward from the upper surface of the column capital 28. As a result, the girder 22 is continuously arranged so as to straddle the top of the column capital 28 of the column 20, and is joined to the column capital 28 of the column 20.

As shown in Figures 2 and 6, the girder 22 includes a beam end member 36 and a beam intermediate member 38 that has a smaller beam thickness than the beam end member 36. The beam end member 36 and the beam intermediate member 38 are made of H-shaped steel.

As shown in FIG. 6, the beam end member 36 and the beam intermediate member 38 are bolted together at the joint 40 using splice plates 42, 44. The joint position of the joint 40 is set at a position where the stress generated in the main girder 22 is small.

As shown in FIG. 1, all of the small beams 24 are arranged in the girder direction Y, and are arranged in parallel at a predetermined interval in the span direction X. In other words, the small beams 24 are arranged so as to intersect with the main beams 22 at right angles.

As shown in Figures 3 and 5, the secondary beam 24 is placed on the upper surface of the main beam 22. The secondary beam 24 is joined to the main beam 22 by bolting the lower flange 80 of the secondary beam 24 to the upper flange 78 of the main beam 22 with bolts 46.

As a result, the small beams 24 are arranged continuously across the main beam 22 and are joined to the upper surface of the main beam 22.

As shown in FIG. 8, the sub-beams 24 are bolted together at the joint 48 using splice plates 50 and 52. The joint position of the joint 48 is set at a position where the stress generated in the sub-beam 24 is small. As a result, the joint 48 is a type in which only the web 82 and the lower flange 80 of the sub-beam 24 are bolted together using the splice plates 50 and 52.

As shown in FIG. 8, a folded-plate roof 84 is provided on the joists 24. The folded-plate roof 84 is composed of a steel frame 54 installed on the joists 24 and a steel folded plate 56 as a roofing material attached on top of the steel frame 54. For convenience of explanation, the folded-plate roof 84 is omitted from FIG. 1 and FIG. 2.

As explained above, the column-beam structure 10 has a layered structure in which the columns 20, the girders 22, and the minor beams 24 are stacked in this order, with the main beams 22 placed and joined to the column capitals 28 of the columns 20, and the minor beams 24 placed and joined to the top surfaces of the main beams 22 (see Figure 2).

(Construction method of column-beam frame)
Next, an example of a construction method for the column-beam structure according to this embodiment will be described (see Figs. 2, 5 and 8).

First, the columns 20 are erected on the mat slab 14.

Next, the girder 22 is placed on the top surface of the column capital 28 of the column 20, and the girder 22 is placed across the column capital 28 of the column 20.

Next, the girder 22 is joined to the column capital 28 of the column 20 using anchor bolts 30.

Next, the minor beam 24 is placed on the top surface of the main beam 22, and the minor beam 24 is placed across the top surface of the main beam 22.

Next, the minor beam 24 is joined to the major beam 22 using bolts 46.

Next, a tight frame 54 is installed on the joists 24, and a folded plate 56 is attached to the tight frame 54 to form a folded plate roof 84.

(effect)
Next, the effects of this embodiment will be described.

As shown in Figures 1 and 2, in the column-beam structure 10 of this embodiment, a girder 22 arranged in one direction is spanned and joined to the column capital 28 of a column 20 erected on a mat slab 14.

This simplifies the joint structure between the column 20 and the girder 22 by simply placing the girder 22 on the column capital 28 of the column 20 and joining it, reducing the amount of work required to process the column 20 and the girder 22 to form the joint structure and improving the ease of construction of the column-beam structure 10.

In addition, the girder 22 acts as if it were rigidly connected to the column 20 against vertical loads, making it possible to construct a beam with a larger span compared to a joint structure in which the beam is pin-connected to the column.

Furthermore, in conventional joint structures in which a steel beam is joined to a beam bracket that protrudes from a column, the position of the joint is determined by the length of the beam bracket. For example, if the beam bracket attached to the column must be shortened due to transportation constraints, the joint position for joining the steel beam to the beam bracket must be located at a position where large stress is generated. As a result, even in beams where the cross-sectional size is divided between the beam bracket and the steel beam, the cross-sectional size of the beam cannot be significantly reduced, and the amount of steel required increases.

In contrast, in the beam-column structure 10 of this embodiment, as shown in Figures 2 and 6, the joint 40 of the girder 22 can be positioned at a position where stress is small. This makes it possible to simplify the joint structure of the girder 22 and reduce the number of bolts, and to significantly reduce the cross-section of the middle part of the span of the girder 22.

As shown in Figures 1 and 2, according to the column-beam structure 10 of this embodiment, the small beam 24 is joined to the upper surface of the main beam 22 so as to cross the main beam 22.

This simplifies the joint structure between the main girder 22 and the secondary beam 24 by simply placing the secondary beam 24 on the top surface of the main girder 22 and joining it, reducing the effort required for steel processing on the main girder 22 and secondary beam 24 to form the joint structure and improving the ease of construction of the column-beam structure 10.

The secondary beams 24 are arranged continuously across the main beams 22, so they act as if they are rigidly connected to the main beams 22. This allows the cross section of the secondary beams 24 to be smaller, and the amount of steel required to be reduced. In addition, compared to a joint structure in which secondary beams are joined to the main beams by butt welding, the amount of processing required for the main beams 22 and secondary beams 24 can be reduced.

As shown in FIG. 7, in the conventional joint structure of the rigidly-jointed sub-beam, the end of the beam flange 60, which is rigidly joined to the web 88 of the main beam 58, is joined to the sub-beam 62 by the splice plates 66 and 68 at the joint 64. In addition, the splice plate 66 protruding upward from the upper surface of the upper flange of the beam flange 60 and the sub-beam 62, and the raising material 74 for raising the amount of the bolts and nuts are provided on the upper flange of the beam flange 60 and the sub-beam 62, and the cover material 76 is provided on the joint 64, the tight frame 70 is installed on the raising material 74 and the cover material 76, and the folded plate 72 is attached on the tight frame 70 to form the folded plate roof 86. In other words, separate members such as the raising material 74 and the cover material 76 are required so that the tight frame 70 does not interfere with the splice plate 66 protruding upward from the upper surface of the upper flange of the beam flange 60 and the sub-beam 62, the bolts and nuts.

In contrast, in the column-beam structure 10 of this embodiment, as shown in FIG. 8, the joint position of the joint section 48 where the sub-beams 24 are joined is set at a position where the stress generated in the sub-beams 24 is small, and the joint section 48 is a type in which only the web 82 and the lower flange 80 of the sub-beam 24 are bolted together using splice plates 50, 52. As a result, the upper surface of the joint section 48 (sub-beam 24) is flat, so that the tight frame 54 can be attached directly to the upper surface of the upper flange of the sub-beam 24 without performing any height-raising procedure.

Furthermore, according to the column-beam structure 10 of this embodiment, the main girder 22 is placed on and joined to the column capital 28 of the column 20, and the sub-beam 24 is placed on and joined to the top surface of the main girder 22, forming a layered structure in which the column 20, the main girder 22, and the sub-beam 24 are stacked in this order. This improves the construction efficiency of the column-beam structure 10, and can shorten the construction period and reduce the number of people required.

As shown in FIG. 2, in the column-beam structure 10 of this embodiment, the columns 20 are made of precast concrete. This reduces the labor required to construct the columns 20 at the construction site, thereby further improving the ease of construction of the column-beam structure 10.

Furthermore, as shown in Figures 2 and 6, according to the column-beam structure 10 of this embodiment, the girder 22 includes a beam end member 36 and a beam intermediate member 38 that has a smaller beam thickness than the beam end member 36. This allows the girder 22 to be constructed with a small amount of steel.

(Modification)
Next, a modification of the above embodiment will be described.

In the above embodiment, as shown in FIG. 2, an example was shown in which the main beam 22 and the sub-beam 24 were made of H-shaped steel, but the main beam 22 and the sub-beam 24 may be made of steel. For example, the main beam 22 and the sub-beam 24 may be made of channel steel.

In the above embodiment, as shown in FIG. 2, the column 20 is made of precast concrete, but it may be made of other structures. For example, the column 20 may be made of cast-in-place reinforced concrete or steel frame.

In addition, in the above embodiment, as shown in FIG. 3, an example is shown in which the girder 22 is joined to the column 20 by the anchor bolt 30, but other joining methods may be used. For example, the girder 22 may be joined to the column 20 by bolt joining.

In the above embodiment, as shown in FIG. 1, an example is shown in which the column-beam structure 10 of the present invention is applied to a single-story building 12, but the column-beam structure 10 of the present invention may also be applied to the rooftop of a multi-story building.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and one embodiment and various modified examples may be used in appropriate combination, and the present invention may of course be embodied in various forms without departing from the spirit of the present invention.

10 Column-beam frame 14 Mat slab (support structure)
20 Column 22 Large beam (first steel beam)
24. Small beam (second steel beam)
28 Capital part (head)
36 Beam end member 38 Beam intermediate member

Claims (2)

a precast concrete column erected on a support structure;
a first steel beam including a lower flange and a base plate integrally joined to an outer end of the lower flange so as to be flush with the lower flange, the first steel beam being joined to the head of the column via the base plate in an inclined state and disposed in one direction;
A second steel beam that is spanned and joined to an upper flange of the first steel beam so as to intersect with the first steel beam;
A column-beam structure having: The first steel beam includes a beam end member and a beam intermediate member that is bolted to the beam end member and has a beam width smaller than that of the beam end member.
The column-beam structure according to claim 1 .