Building unit connection structure

Abstract

To connect steel pipe poles of a building unit which are adjacent to each other vertically while improving a degree of fixation of a steel beam to the steel pipe pole.SOLUTION: Building unit connection structure comprises a first building unit 20A including a first steel pipe pole 30A and an upper steel beam 40U with a beam end 40E connected to a pole head 30U of the first steel pipe pole 30A, a second building unit 20B including a second steel pipe pole 30B arranged on the first steel pipe pole 30A and a lower steel beam 40L with the beam end 40E connected to the pole leg of the second steel pipe pole 30B and a connection steel pipe 50 in which cement type filling material 52 is filled, and which has a lower part fitted in the pole head 30U of the first steel pipe pole 30A and an upper part fitted in the pole leg 30L of the second steel pipe pole 30B, for connecting the first steel pipe pole 30A and the second steel pipe pole 30B.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a building unit connection structure.

Background Art

[0002] There is known a joining structure of steel pipe columns in which concrete is filled and joined inside upper and lower steel pipe columns (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, on-site, a unit method (unit construction) of constructing a building by stacking a plurality of box-shaped building units is known.

[0005] A building unit includes, for example, a plurality of steel pipe columns erected at four corners and a plurality of steel frame beams respectively installed on adjacent steel pipe columns, and is stacked on-site. Then, the steel pipe columns of the box-shaped units adjacent vertically are joined.

[0006] In this type of unit method, there is a desire to increase the degree of fixation of the steel frame beam to the steel pipe column while joining the steel pipe columns of the box-shaped units adjacent vertically on-site.

[0007] In consideration of the above facts, an object of the present invention is to increase the degree of fixation of the steel frame beam to the steel pipe column while joining the steel pipe columns of the building units adjacent vertically.

Means for Solving the Problems

[0008] The building unit connecting structure according to claim 1 comprises: a first building unit having a first steel pipe column and a first steel beam whose beam end is joined to the column head of the first steel pipe column; a second building unit having a second steel pipe column positioned on the first steel pipe column and a second steel beam whose beam end is joined to the column base of the second steel pipe column; and a connecting steel pipe which is filled with a cement-based filler inside, has its lower part fitted into the column head of the first steel pipe column and its upper part fitted into the column base of the second steel pipe column, and connects the first steel pipe column and the second steel pipe column.

[0009] According to the building unit connecting structure of claim 1, the first building unit has a first steel pipe column and a first steel beam whose beam end is joined to the column head of the first steel pipe column. The second building unit has a second steel pipe column placed on top of the first steel pipe column and a second steel beam whose beam end is joined to the column base of the second steel pipe column.

[0010] The connecting steel pipe is filled with a cement-based filler. The lower part of this connecting steel pipe is fitted into the top of the first steel pipe column, and the upper part is fitted into the base of the second steel pipe column. The first and second steel pipe columns are connected by this connecting steel pipe.

[0011] As mentioned earlier, the lower part of the connecting steel pipe is fitted into the column head of the first steel pipe column. The beam end of the first steel beam is joined to the column head of the first steel pipe column. This suppresses deformation of the column head when a compressive force is applied from the beam end of the first steel beam to the column head of the first steel pipe column under horizontal force. In other words, the degree of fixation of the beam end of the first steel beam to the column head of the first steel pipe column is increased.

[0012] Similarly, the upper part of the connecting steel pipe is fitted into the base of the second steel pipe column. The beam end of the second steel beam is joined to this base of the second steel pipe column. As a result, when a compressive force is applied from the beam end of the second steel beam to the base of the second steel pipe column under horizontal force, deformation of the base is suppressed. In other words, the degree of fixation of the beam end of the second steel beam to the base of the second steel pipe column is increased.

[0013] Thus, in this invention, the first steel pipe column of the first building unit and the second steel pipe column of the second building unit, which are adjacent to each other vertically, can be joined. Furthermore, in this invention, the degree of fixation of the beam end of the first steel beam to the column head of the first steel pipe column can be increased, and the degree of fixation of the beam end of the second steel beam to the column base of the second steel pipe column can be increased.

[0014] The building unit connecting structure according to claim 2 is the building unit connecting structure according to claim 1, further comprising: a first cement-based hardened body provided at the beam end of the first steel beam and in contact with the column head of the first steel pipe column; and a second cement-based hardened body provided at the beam end of the second steel beam and in contact with the column base of the second steel pipe column.

[0015] According to the building unit connecting structure of claim 2, a first cement-based hardened body is provided at the beam end of the first steel beam. The first cement-based hardened body is in contact with the column head of the first steel pipe column. As a result, when a horizontal force is applied, the compressive force is distributed and acts from the beam end of the first steel beam to the column head of the first steel pipe column via the first cement-based hardened body.

[0016] Therefore, deformation of the column head of the first steel pipe column is further suppressed. In other words, the degree of fixation of the beam end of the first steel beam to the column head of the first steel pipe column is further increased.

[0017] Similarly, a second cement-based hardened body is provided at the beam end of the second steel beam. The second cement-based hardened body is in contact with the base of the second steel pipe column. As a result, when a horizontal force is applied, the compressive force is distributed and acts from the beam end of the second steel beam to the base of the second steel pipe column via the second cement-based hardened body.

[0018] Therefore, deformation of the column head of the first steel pipe column is further suppressed. In other words, the degree of fixation of the beam end of the first steel beam to the column head of the first steel pipe column is further increased.

[0019] The building unit connection structure according to claim 3 is the building unit connection structure according to claim 1 or claim 2, wherein the lower end of the connecting steel pipe is located below the lower end of the second steel frame beam, and the upper end of the connecting steel pipe is located above the upper end of the second steel frame beam.

[0020] According to the building unit connection structure according to claim 3, the lower end of the connecting steel pipe is located below the lower end of the second steel frame beam. Thereby, when a horizontal force acts, the compressive force acting from the first steel frame beam to the column head of the first steel pipe column can be received by the entire lower part of the connecting steel pipe. Therefore, the deformation of the column head of the first steel pipe column can be more reliably suppressed.

[0021] Also, the upper end of the connecting steel pipe is located above the upper end of the second steel frame beam. Thereby, when a horizontal force acts, the compressive force acting from the beam end of the second steel frame beam to the column foot of the second steel pipe column can be received by the entire upper part of the connecting steel pipe. Therefore, the deformation of the column foot of the second steel pipe can be more reliably suppressed.

Advantages of the Invention

[0022] As described above, according to the present invention, while joining the steel pipe columns of the building units adjacent vertically, the fixing degree of the steel frame beam to the steel pipe column can be increased.

Brief Description of the Drawings

[0023] [Figure 1] It is an exploded perspective view of a first building unit and a second building unit to which the building unit connection structure according to an embodiment is applied, decomposed. [Figure 2] It is an elevation view showing the connection part between the first steel pipe column and the second steel pipe column shown in FIG. 1. [Figure 3] It is an exploded elevation view of the first steel pipe column, the second steel pipe column, and the connecting steel pipe shown in FIG. 2, decomposed. [Figure 4] It is a sectional view taken along line 4-4 of FIG. 2. [Figure 5]This is an elevation view corresponding to Figure 2, showing the connection between a first steel pipe column and a second steel pipe column to which a modified example of the building unit connection structure according to one embodiment is applied. [Figure 6] Figure 5 is an exploded elevation view of the first steel pipe column, the second steel pipe column, and the connecting steel pipe, as shown in the figure. [Modes for carrying out the invention]

[0024] An embodiment will be described below with reference to the drawings.

[0025] (building) Figure 1 shows a building (unit building) 10 constructed using a modular construction method. The building 10 comprises multiple building units 20. The multiple building units 20 are formed in a box shape (rectangular parallelepiped shape). The multiple building units 20 are arranged horizontally on site and stacked in multiple layers. The building 10 is constructed using these building units 20.

[0026] (Building Unit) Multiple building units 20 are, for example, the same shape and size. Each building unit 20 has multiple steel pipe columns (steel pipe corner columns) 30, multiple upper steel beams 40U, and multiple lower steel beams 40L. These steel pipe columns 30, upper steel beams 40U, and lower steel beams 40L are arranged along each side of the box-shaped building unit 20 and are pre-joined in a factory or similar facility.

[0027] The multiple (four) steel pipe columns 30 are formed from square steel pipes. The steel pipe columns 30 are also erected at each of the four corners of the building unit 20.

[0028] Multiple upper steel beams 40U are erected on the column heads 30U (see Figure 2) of adjacent steel pipe columns 30. These upper steel beams 40U constitute the planar frame at the upper end of the building unit 20. Ceiling panels (ceiling materials) 22 are attached to this planar frame. Note that the ceiling panels 22 are optional.

[0029] Multiple lower steel beams 40L are erected on the column bases 30L (see Figure 2) of adjacent steel pipe columns 30. These multiple lower steel beams 40L also constitute the planar frame at the lower end of the building unit 20. Floor panels (flooring materials) 24 are attached to this planar frame. Note that the floor panels 24 are optional.

[0030] An upper steel beam 40U and a lower steel beam 40L are erected on a pair of adjacent steel pipe columns 30. These pairs of steel pipe columns 30, the upper steel beam 40U, and the lower steel beam 40L constitute the vertical frame surrounding the building unit 20. Wall panels (wall materials) 26 or windows (sashes) (not shown) are attached to this vertical frame. Note that the wall panels (wall materials) 26 and windows (sashes) are optional.

[0031] Building units 20 are stacked on top of other building units 20. For the sake of explanation, the first-tier building unit 20 will be referred to as the first building unit 20A, and the second-tier building unit 20 will be referred to as the second building unit 20B. The steel pipe columns 30 of the first building unit 20A will be referred to as the first steel pipe columns 30A, and the steel pipe columns 30 of the second building unit 20B will be referred to as the second steel pipe columns 30B.

[0032] Furthermore, the upper steel beam 40U of the first building unit 20A is an example of a first steel beam. Also, the lower steel beam 40L of the second building unit 20B is an example of a second steel beam.

[0033] (Building unit interconnected structure) Multiple second steel pipe columns 30B of the second building unit 20B are each positioned on top of multiple first steel pipe columns 30A of the first building unit 20A. The multiple first steel pipe columns 30A and the multiple second steel pipe columns 30B are each connected via connecting steel pipes 50. The connection structure between the first steel pipe columns 30A of the first building unit 20A and the second steel pipe columns 30B of the second building unit 20B will be described in detail below.

[0034] Figure 2 shows an elevation view corresponding to the area R indicated by the dotted line in Figure 1. As shown in Figure 2, the first building units 20A, arranged horizontally, are positioned with each first steel pipe column 30A adjacent to one another.

[0035] Furthermore, the second steel pipe column 30B of the second building unit 20B is positioned on top of the first steel pipe column 30A of the first building unit 20A. In addition, the lower steel beam 40L of the second building unit 20B is positioned on top of the upper steel beam 40U of the first building unit 20A.

[0036] (Connected steel pipe) As shown in Figures 2 and 3, the cross-sectional shapes of the first steel pipe column 30A and the second steel pipe column 30B are the same. Furthermore, the cross-sectional sizes of the first steel pipe column 30A and the second steel pipe column 30B are also the same. The first steel pipe column 30A and the second steel pipe column 30B are connected via a connecting steel pipe 50 to transmit an axial force N.

[0037] Specifically, the connecting steel pipe 50 is formed from a square steel pipe. The cross-sectional shape of this connecting steel pipe 50 is the same as that of the first steel pipe column 30A and the second steel pipe column 30B. Furthermore, the cross-sectional size of the connecting steel pipe 50 is slightly smaller than that of the first steel pipe column 30A and the second steel pipe column 30B. The lower part of this connecting steel pipe 50 is fitted into the column head 30U of the first steel pipe column 30A. On the other hand, the upper part of the connecting steel pipe 50 is fitted into the column base 30L of the second steel pipe column 30B.

[0038] The inside of the connecting steel pipe 50 is filled with a cement-based filler 52. The cement-based filler 52 is made of, for example, hardened concrete, hardened mortar, or hardened grout. The cement-based filler 52 is filled from the lower end 50A to the upper end 50B of the connecting steel pipe 50. The column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B are reinforced by this connecting steel pipe 50.

[0039] The cement-based filler 52 may also be filled inside the connecting steel pipe 50 when the lower part of the connecting steel pipe 50 is fitted into the column head 30U of the first steel pipe column 30A. Alternatively, the cement-based filler 52 may be filled inside the connecting steel pipe 50 at a factory or construction site, for example.

[0040] A first axial force transmission plate 32A is provided inside the column head 30U of the first steel pipe column 30A. The first axial force transmission plate 32A is formed in a rectangular shape when viewed from above. The first axial force transmission plate 32A is fitted inside the column head 30U of the first steel pipe column 30A. The outer periphery of this first axial force transmission plate 32A is joined to the inner circumferential surface of the column head 30U of the first steel pipe column 30A by welding or the like.

[0041] The first axial force transmission plate 32A is positioned below the lower end 40A of the upper steel beam 40U. The lower end 50A of the connecting steel pipe 50 rests on top of this first axial force transmission plate 32A. As a result, the axial force N is transmitted from the connecting steel pipe 50 to the first steel pipe column 30A via the first axial force transmission plate 32A. Furthermore, the lower end 50A of the connecting steel pipe 50 is positioned below the lower end 40A of the upper steel beam 40U.

[0042] A second axial force transmission plate 32B is provided within the column base 30L of the second steel pipe column 30B. The second axial force transmission plate 32B is formed in a rectangular shape when viewed from above. The second axial force transmission plate 32B is fitted into the column base 30L of the second steel pipe column 30B. The outer circumference of this second axial force transmission plate 32B is joined to the inner surface of the column base 30L of the second steel pipe column 30B by welding or the like.

[0043] The second axial force transmission plate 32B is positioned above the upper end 40B of the lower steel beam 40L. This second axial force transmission plate 32B rests on the upper end 50B of the connecting steel pipe 50. In other words, the second axial force transmission plate 32B is supported by the first axial force transmission plate 32A via the connecting steel pipe 50.

[0044] As a result, the axial force N is transmitted from the second steel pipe column 30B to the connecting steel pipe 50 via the second axial force transmission plate 32B. In addition, the upper end 50B of the connecting steel pipe 50 is positioned above the upper end 40B of the lower steel beam 40L.

[0045] Furthermore, with the second axial force transmission plate 32B supported by the first axial force transmission plate 32A via the connecting steel pipe 50, a gap is formed between the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B. Similarly, with the second axial force transmission plate 32B supported by the first axial force transmission plate 32A via the connecting steel pipe 50, a gap is formed between the upper steel beam 40U and the lower steel beam 40L.

[0046] (First-grade cement-based hardened material) As shown in Figure 2, the upper steel beam 40U of the first building unit 20A is formed of H-shaped steel. This upper steel beam 40U has an upper flange 42 and a lower flange 44 that face each other in the vertical direction, and a web 46 that connects the upper flange 42 and the lower flange 44.

[0047] A pair of first cement-based hardened bodies 60A are provided at the beam end 40E of the upper steel beam 40U. The pair of first cement-based hardened bodies 60A are formed from, for example, hardened concrete, hardened mortar, or hardened grout. Each first cement-based hardened body 60A is formed in the shape of a rectangular parallelepiped (block).

[0048] As shown in Figure 4, a pair of first cement-based hardened bodies 60A are positioned on both sides of the web 46 of the upper steel beam 40U. Each first cement-based hardened body 60A is positioned between the upper flange 42 and the lower flange 44 of the upper steel beam 40U.

[0049] Through holes 46H and 60H are formed in the web 46 and the pair of first cement-based hardened bodies 60A, respectively. The pair of first cement-based hardened bodies 60A are fixed to the web 46 by tightening nuts 72 on both ends of through bolts 70 inserted into these through holes 46H and 60H. The beam end 40E of the upper steel beam 40U is reinforced by this pair of first cement-based hardened bodies 60A.

[0050] As shown in Figure 2, the side surface 60S of the first cement-based hardened body 60A is in contact (surface contact) with the side surface 30S of the column head 30U of the first steel pipe column 30A. As a result, when a horizontal force is applied, a compressive force P is transmitted from the upper steel beam 40U to the side surface 30S of the column head 30U of the first steel pipe column 30A via the side surface 60S of the first cement-based hardened body 60A.

[0051] (Second cement-based hardened body) As shown in Figure 2, the lower steel beam 40L of the second building unit 20B is formed of H-shaped steel. This lower steel beam 40L has an upper flange 42 and a lower flange 44 that face each other in the vertical direction, and a web 46 that connects the upper flange 42 and the lower flange 44.

[0052] A pair of second cement-based hardened bodies 60B are provided at the beam end 40E of the lower steel beam 40L. The pair of second cement-based hardened bodies 60B are formed from, for example, hardened concrete, hardened mortar, or hardened grout. Each second cement-based hardened body 60B is formed in the shape of a rectangular parallelepiped (block).

[0053] As shown in Figure 4, a pair of second cement-based hardened bodies 60B are positioned on both sides of the web 46 of the lower steel beam 40L. Each second cement-based hardened body 60B is positioned between the upper flange 42 and the lower flange 44 of the lower steel beam 40L.

[0054] Through holes 46H and 60H are formed in the web 46 and the pair of second cement-based hardened bodies 60B, respectively. The pair of second cement-based hardened bodies 60B are fixed to the web 46 by tightening nuts 72 on both ends of through bolts 70 inserted into these through holes 46H and 60H. The beam end 40E of the lower steel beam 40L is reinforced by this pair of second cement-based hardened bodies 60B.

[0055] As shown in Figure 2, the side surface 60S of the second cement-based hardened body 60B is in contact (surface contact) with the side surface 30S of the column head 30U of the first steel pipe column 30A. As a result, when a horizontal force is applied, a compressive force P is transmitted from the lower steel beam 40L to the side surface 30S of the column head 30U of the first steel pipe column 30A via the side surface 60S of the second cement-based hardened body 60B.

[0056] (action) Next, the operation of this embodiment will be described.

[0057] As shown in Figure 2, the first steel pipe column 30A of the first building unit 20A and the second steel pipe column 30B of the second building unit 20B are connected via a connecting steel pipe 50 so as to be able to transmit axial force (vertical load) N.

[0058] Specifically, the lower part of the connecting steel pipe 50 is fitted into the column head 30U of the first steel pipe column 30A. The lower end 50A of the connecting steel pipe 50 is placed on the first axial force transmission plate 32A. On the other hand, the upper part of the connecting steel pipe 50 is fitted into the column base 30L of the second steel pipe column 30B. In this way, the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B are connected via the connecting steel pipe 50.

[0059] Furthermore, the inside of the connecting steel pipe 50 is filled with a cement-based filler 52. The second axial force transmission plate 32B is placed on the upper end 50B of the connecting steel pipe 50. In other words, the second axial force transmission plate 32B is supported by the connecting steel pipe 50.

[0060] As a result, the axial force N of the second steel pipe column 30B is transmitted from the second axial force transmission plate 32B to the connecting steel pipe 50 and the cement-based filler material 52. The axial force N transmitted to the connecting steel pipe 50 and the cement-based filler material 52 is then transmitted to the second steel pipe column 30B via the first axial force transmission plate 32A.

[0061] Thus, in this embodiment, the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B can be connected via the connecting steel pipe 50 and the cement-based filler 52 in a manner that allows for the transmission of axial force N.

[0062] Furthermore, in this embodiment, the first steel pipe column 30A and the second steel pipe column 30B can be easily connected by fitting the connecting steel pipe 50 into the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B. Therefore, the constructability of the first building unit 20A and the second building unit 20B is improved.

[0063] The connecting steel pipe 50 may be pre-fitted into the column head 30U of the first steel pipe column 30A before the installation of the first building unit 20A. Alternatively, the connecting steel pipe 50 may be fitted into the column head 30U of the first steel pipe column 30A after the installation of the first building unit 20A.

[0064] Furthermore, in this embodiment, with the second axial force transmission plate 32B supported by the second axial force transmission plate 32B via the connecting steel pipe 50, a gap is formed between the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B. This gap can absorb construction errors of the first steel pipe column 30A and the second steel pipe column 30B.

[0065] Furthermore, in this embodiment, with the second axial force transmission plate 32B supported by the first axial force transmission plate 32A via the connecting steel pipe 50, a gap is formed between the upper steel beam 40U and the lower steel beam 40L. This gap can absorb construction errors in the upper steel beam 40U and the lower steel beam 40L. Therefore, the constructability of the first building unit 20A and the second building unit 20B is further improved.

[0066] (Connection structure between the column head of the first steel pipe column and the beam end of the upper steel beam) Next, we will explain the function of the connection structure between the column head 30U of the first steel pipe column 30A and the beam end 40E of the upper steel beam 40U.

[0067] As shown in Figure 2, the beam end 40E of the upper steel beam 40U is joined to the column head 30U of the first steel pipe column 30A. The lower part of the connecting steel pipe 50 is fitted into the column head 30U of the first steel pipe column 30A.

[0068] As a result, when a horizontal force is applied, if a compressive force P is applied to the column head 30U of the first steel pipe column 30A from the beam end 40E of the upper steel beam 40U, deformation such as crushing of the column head 30U is suppressed. In other words, the degree of fixation of the beam end 40E of the upper steel beam 40U to the column head 30U of the first steel pipe column 30A is increased.

[0069] Furthermore, the compressive force P transmitted to the column head 30U of the first steel pipe column 30A is distributed and transmitted to the cement-based filler material 52 via the connecting steel pipe 50. This suppresses localized failure of the cement-based filler material 52. Consequently, the degree of fixation of the beam end 40E of the upper steel beam 40U to the column head 30U of the first steel pipe column 30A is further enhanced.

[0070] Furthermore, the lower end 50A of the connecting steel pipe 50 is located below the lower end 40A of the upper steel beam 40U. This allows the entire lower part of the connecting steel pipe 50 to receive the compressive force P acting from the beam end 40E of the upper steel beam 40U to the column head 30U of the first steel pipe column 30A when a horizontal force is applied. Therefore, deformation such as crushing of the column head 30U of the first steel pipe column 30A can be suppressed more reliably.

[0071] Furthermore, the cement-based filler 52 has a large heat capacity. Therefore, by filling the connecting steel pipe 50 with the cement-based filler 52, the fire resistance of the connecting steel pipe 50 and the column head 30U of the first steel pipe column 30A can be improved. As a result, the fire-resistant coating of the column head 30U of the first steel pipe column 30A can be omitted or reduced.

[0072] Furthermore, a pair of first cement-based hardened bodies 60A are provided at the beam end 40E of the upper steel beam 40U. The side surfaces 60S of the pair of first cement-based hardened bodies 60A are in contact with the side surfaces 30S of the column head 30U of the first steel pipe column 30A.

[0073] As a result, when a horizontal force is applied, the compressive force P acting from the upper steel beam 40U to the column head 30U of the first steel pipe column 30A is distributed and transmitted to the side surfaces 60S of the column head 30U of the first steel pipe column 30A via the side surfaces 60S of the pair of first cement-based hardened bodies 60A. Therefore, the deformation of the column head 30U of the first steel pipe column 30A is further suppressed.

[0074] Furthermore, by sandwiching the web 46 of the beam end 40E of the upper steel beam 40U from both sides with a pair of first cement-based hardened bodies 60A, buckling of the web 46 is suppressed.

[0075] Furthermore, the pair of first cement-based hardened bodies 60A have a large heat capacity. Therefore, by providing the pair of first cement-based hardened bodies 60A at the beam end 40E of the upper steel beam 40U, the fireproofing of the beam end 40E can be omitted or reduced.

[0076] Furthermore, as shown in Figure 3, the pair of first cement-based hardened bodies 60A can be easily attached to the beam ends 40E of the upper steel beam 40U using through bolts 70 and nuts 72. Therefore, the constructability of the upper steel beam 40U is improved.

[0077] (Connection structure between the base of the second steel pipe column and the end of the lower steel beam) Next, we will explain the operation of the connection structure between the column base 30L of the second steel pipe column 30B and the beam end 40E of the lower steel beam 40L.

[0078] As shown in Figure 2, the beam end 40E of the lower steel beam 40L is joined to the column base 30L of the second steel pipe column 30B. The lower part of the connecting steel pipe 50 is fitted into the column base 30L of the second steel pipe column 30B.

[0079] As a result, when a horizontal force is applied, if a compressive force P is applied to the base 30L of the second steel pipe column 30B from the beam end 40E of the lower steel beam 40L, deformation such as crushing of the base 30L is suppressed. In other words, the degree of fixation of the beam end 40E of the lower steel beam 40L to the base 30L of the second steel pipe column 30B is increased.

[0080] Furthermore, the compressive force P transmitted to the column base 30L of the second steel pipe column 30B is distributed and transmitted to the cement-based filler material 52 via the connecting steel pipe 50. This suppresses localized failure of the cement-based filler material 52. Consequently, the degree of fixation of the beam end 40E of the lower steel beam 40L to the column base 30L of the second steel pipe column 30B is further enhanced.

[0081] Furthermore, the upper end 50B of the connecting steel pipe 50 is located above the upper end 40B of the lower steel beam 40L. This allows the entire upper part of the connecting steel pipe 50 to receive the compressive force P acting from the beam end 40E of the lower steel beam 40L to the column base 30L of the second steel pipe column 30B when a horizontal force is applied. Therefore, deformation such as crushing of the column base 30L of the second steel pipe column 30B can be suppressed more reliably.

[0082] Furthermore, as mentioned above, the cement-based filler 52 has a large heat capacity. Therefore, by filling the connecting steel pipe 50 with the cement-based filler 52, the fire resistance of the connecting steel pipe 50 and the column base 30L of the second steel pipe column 30B is improved. As a result, the fire-resistant coating of the column base 30L of the second steel pipe column 30B can be omitted or reduced.

[0083] Furthermore, a pair of second cement-based hardened bodies 60B are provided at the beam end 40E of the lower steel beam 40L. The side surfaces 60S of the pair of second cement-based hardened bodies 60B are in contact with the side surfaces 30S of the column base 30L of the second steel pipe column 30B.

[0084] As a result, when a horizontal force is applied, the compressive force P acting from the lower steel beam 40L to the base 30L of the second steel pipe column 30B is distributed and transmitted to the side surfaces 60S of the base 30L of the second steel pipe column 30B via the side surfaces 60S of the pair of second cement-based hardened bodies 60B. Therefore, the deformation of the base 30L of the second steel pipe column 30B is further suppressed.

[0085] Furthermore, the buckling of the web 46 of the beam end 40E of the lower steel beam 40L is suppressed by sandwiching the web 46 from both sides with a pair of second cement-based hardened bodies 60B.

[0086] Furthermore, the pair of second cement-based hardened bodies 60B have a large heat capacity. Therefore, by providing the pair of second cement-based hardened bodies 60B at the beam end 40E of the lower steel beam 40L, the fireproofing of the beam end 40E can be omitted or reduced.

[0087] Furthermore, as shown in Figure 3, the pair of second cement-based hardened bodies 60B can be easily attached to the beam ends 40E of the lower steel beam 40L using through bolts 70 and nuts 72. Therefore, the constructability of the lower steel beam 40L is improved.

[0088] (modified version) Next, a modified example of the above embodiment will be described.

[0089] In the above embodiment, a second axial force transmission plate 32B is provided at the base portion 30L of the second steel pipe column 30B. However, the second axial force transmission plate 32B may be omitted, and the base portion 30L of the second steel pipe column 30B may be placed on the top portion 30U of the first steel pipe column 30A. In this case, axial force is transmitted from the base portion 30L of the second steel pipe column 30B to the top portion 30U of the first steel pipe column 30A. In other words, the first steel pipe column 30A and the second steel pipe column 30B are connected by the connecting steel pipe 50 in a way that enables the transmission of axial force.

[0090] Furthermore, in the modified examples shown in Figures 5 and 6, a pair of adjacent connecting steel pipes 50 are connected via an axial force transmission plate 80. The axial force transmission plate 80 is formed in a rectangular shape when viewed from above.

[0091] The axial force transmission plate 80 is provided in the middle of the pair of connecting steel pipes 50 in the axial direction. Specifically, the axial force transmission plate 80 crosses the middle of the pair of connecting steel pipes 50 in the axial direction, like an outer diaphragm. The outer circumference of this axial force transmission plate 80 protrudes outward from the pair of connecting steel pipes 50.

[0092] The outer circumference of the axial force transmission plate 80 is engaged with the upper ends of an adjacent pair of first steel pipe columns 30A. In this state, the lower parts of the pair of connecting steel pipes 50 are fitted into the column heads 30U of the pair of first steel pipe columns 30A. The upper parts of the pair of connecting steel pipes 50 are fitted into the column bases 30L of an adjacent pair of second steel pipe columns 30B.

[0093] The base portions 30L of a pair of second steel pipe columns 30B are resting on the top portions 30U of a pair of first steel pipe columns 30A via axial force transmission plates 80. In other words, the base portions 30L of a pair of second steel pipe columns 30B are supported on the top portions 30U of a pair of first steel pipe columns 30A via axial force transmission plates 80. As a result, the axial force N of the pair of second steel pipe columns 30B is transmitted to the pair of first steel pipe columns 30A via axial force transmission plates 80.

[0094] In this manner, an axial force transmission plate 80 may be interposed between the column head 30U of the first steel pipe column 30A and the column base 30L of the second steel pipe column 30B.

[0095] Furthermore, in this modified example, a pair of connecting steel pipes 50 are connected via an axial force transmission plate 80. As a result, a pair of first steel pipe columns 30A are connected via the pair of connecting steel pipes 50, and a pair of second steel pipe columns 30B are also connected via the pair of connecting steel pipes 50.

[0096] Therefore, in this modified configuration, the pair of first steel pipe columns 30A and the pair of second steel pipe columns 30B resist horizontal forces as a whole. Consequently, the seismic performance of the building 10 is improved.

[0097] In this modified example, the pair of connecting steel pipes 50 are connected via an axial force transmission plate 80. However, the axial force transmission plate 80 can also be provided in the middle of a single connecting steel pipe 50 in the axial direction.

[0098] Furthermore, in this modified example, the first axial force transmission plate 32A and the second axial force transmission plate 32B are omitted. However, the first axial force transmission plate 32A may be provided on the first steel pipe column 30A, and the second axial force transmission plate 32B may be provided on the second steel pipe column 30B, and the axial force N may be transmitted via these first axial force transmission plates 32A and 32B, and the connecting steel pipes 50. In this case, the axial force transmission plate 80 does not transmit axial force, but becomes a connecting plate that connects the pair of connecting steel pipes 50.

[0099] Next, in the above embodiment, the cement-based filler 52 is formed from hardened concrete, hardened mortar, or hardened grout. However, the cement-based filler 52 may also be formed from fiber-reinforced concrete, such as hardened steel fiber-reinforced concrete. In this case, the rigidity and toughness of the first steel pipe column 30A and the second steel pipe column 30B are improved, as is the fire resistance performance.

[0100] Furthermore, in the above embodiment, a pair of first cement-based hardened bodies 60A are provided at the beam end 40E of the upper steel beam 40U. However, the pair of first cement-based hardened bodies 60A may be provided as needed and can be omitted as appropriate. Similarly, the pair of second cement-based hardened bodies 60B may be provided as needed and can be omitted as appropriate.

[0101] Furthermore, in the above embodiment, the first steel pipe column 30A, the second steel pipe column 30B, and the connecting steel pipe 50 are formed from square steel pipes. However, the first steel pipe column, the second steel pipe column, and the connecting steel pipe may be formed from round steel pipes.

[0102] Furthermore, in the above embodiment, the upper steel beam 40U and the lower steel beam 40L, which are examples of the first and second steel beams, are formed from H-shaped steel. However, the first and second steel beams are not limited to H-shaped steel, but may also be I-shaped steel, C-shaped steel, or other shaped steel, or steel pipes such as square steel pipes.

[0103] Although one embodiment of the present invention has been described above, the present invention is not limited to these embodiments, and various modifications may be used in appropriate combinations with one embodiment, and of course, the invention can be implemented in various forms without departing from the spirit of the present invention. [Explanation of Symbols]

[0104] 20A First Building Unit 20B Second Building Unit 30A First steel pipe column 30U Column Head (Column head of the first steel pipe column) 30B Second steel pipe column 30L Column base (Column base of the first steel pipe column) 40U Upper steel beam (first steel beam) 40A Lower end (lower end of the first steel beam) 40E Beam end (Beam end of the first steel beam) 40L Lower steel beam (second steel beam) 40B Upper end (Upper end of the second steel beam) 40E Beam end (Beam end of the second steel beam) 50 Connected steel pipe 50A Lower end (lower end of connecting steel pipe) 50B Upper end (upper end of connecting steel pipe) 52 Cement-based fillers 60A First Cement System Hardened Body 60B Second cement-based hardened body N axial force

Claims

1. a first building unit including a first steel pipe column and a first steel beam having a beam end joined to the column capital of the first steel pipe column; a second building unit including a second steel pipe column arranged on the first steel pipe column and a second steel beam having a beam end joined to a column base portion of the second steel pipe column; a connecting steel pipe filled with a cement-based filler, having a lower portion fitted into the column capital of the first steel pipe column and an upper portion fitted into the column base of the second steel pipe column, connecting the first steel pipe column and the second steel pipe column; A building unit connecting structure comprising:

2. a first cementitious hardened body provided at the beam end of the first steel beam and in contact with the column capital of the first steel pipe column; a second cement-based hardened body provided at the beam end of the second steel beam and in contact with the column base of the second steel pipe column; The building unit connection structure according to claim 1 , comprising:

3. The lower end of the connecting steel pipe is located below the lower end of the second steel beam, The upper end of the connecting steel pipe is located above the upper end of the second steel beam.

3. The building unit connection structure according to claim 1 or claim 2.

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