JP3640466B2 - Unit building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit building using the bonding structure according to high-strength bolts.
[0002]
[Prior art]
Conventionally, as a joining structure for structures such as buildings, bolts are prepared in multiple workpieces, and high-strength bolts (high-strength hexagon bolts, torcia-type high-strength bolts, etc.) and nuts that are inserted through these bolts There are some which friction-join those materials to be joined (Japanese Patent Laid-Open No. 2-210143).
[0003]
[Problems to be solved by the invention]
However, in the joining structure with high strength bolts, not only the shape and material of bolts, nuts and washers, but also the diameter of the bolt pilot holes provided in the materials to be joined can be secured. The allowable range up to the nominal bolt diameter + 2mm is specified.
[0004]
That is, FIG. 2 uses the high strength bolt 1, the nut 2, and the washer 3 to fasten the three members to be joined 4A, 4B, and 4C by friction joining. Reference numeral 5 denotes a bolt pilot hole provided in the materials to be joined 4A to 4C. FIG. 2A shows a standard joining specification in which the diameter 5da of the bolt pilot hole 5 is within an allowable range, and the axial force transmission range of the high-strength bolt 1 to the inside of the materials to be joined 4A to 4C is a high-strength bolt. 1 is surrounded by a slanted line L1 starting from the outer edge of the head 1A and a slanted line L2 starting from the outer edge of the washer 3, and the contact area A1a of the friction bonding of the materials to be bonded 4A and 4B, the material to be bonded 4A and the material to be bonded The contact area A2a of the friction bonding of the material 4C is as illustrated. On the other hand, FIG. 2 (B) shows a case where the diameter 5db of the bolt pilot hole 5 is larger than the allowable range, and the contact area A1b of the friction bonding between the material to be bonded 4A and the material to be bonded 4B and the material to be bonded 4A. As shown in the figure, the contact area A2b of the friction welding of the material to be joined 4C is reduced as compared with the case of the standard specification of FIG. For this reason, when the diameter of the bolt pilot hole 5 of FIG. 2 (B) is enlarged, the contact area of the friction bonding of the to-be-joined material 4A and the to-be-joined material 4B, and the to-be-joined material 4A and the to-be-joined material 4C decreased. Therefore, the transmission range of the bolt axial force is reduced, resulting in a decrease in the frictional joining force and consequently a decrease in the fastening strength.
[0005]
Therefore, in the implementation of a joining structure using high-strength bolts, high machining accuracy is required when pre-working bolt prepared holes of a material to be joined at a factory or the like. On the other hand, when the processing accuracy cannot be ensured, there is an inconvenience that there is no other way to deal with by on-site matching and on-site processing.
[0006]
The object of the present invention is to increase the allowable range of the bolt pilot hole diameter in a unit building having a reinforced beam joint structure with high strength bolts, increase the pre-processing rate in the factory of the bolt pilot hole, etc. Is to greatly improve.
[0007]
[Means for Solving the Problems]
In the unit building constructed by installing a plurality of building units adjacent to each other, the present invention according to claim 1 is provided between the beams of two building units adjacent to each other on the left and right sides to the left and right sides . phase Tonariru arranged reinforcing beam to span between the beams of a building unit Te, and opposing two building units each beam across the reinforcing beam, the bolt of a larger diameter than the allowable range to each of the reinforcing beams A hole is provided, and a reinforcing washer is interposed between the head of the high-strength bolt and the beam of the building unit, and between the nut and the beam of the building unit, and the high-strength bolt and nut inserted into the bolt pilot hole. Reinforcement beams are friction bonded to the beams of these building units.
[0008]
The present invention according to claim 2 is a unit building constructed by installing a plurality of building units adjacent to each other, and at least one column omission corner portion defined for each of the plurality of building units is mutually connected by a column omission joint portion. butted adjacent arranged, on the other side of the right and left from between the ceiling beams two neighboring amino building unit at one side of the lateral located in the same plane containing the column omission joints of the building units said adjacent phase Tonariru arranged reinforcing beam to span between the ceiling beams Te, and opposing two building units each ceiling beams across the reinforcing beam, bolt the pilot holes larger diameter than the allowable range to each of the reinforcing beams A high strength bolt and a nut inserted between the nut head and the ceiling beam of the building unit and a reinforcing washer between the nut and the ceiling beam of the building unit. it reinforcing beams by Is obtained by the so frictionally bonded to the ceiling beams of a building unit.
[0009]
According to a third aspect of the present invention, in the present invention according to the first or second aspect, the reinforcing washer is determined from an axial force transmission range of a high-strength bolt with a bolt pilot hole diameter within an allowable range. outer diameter and wall thickness that can ensure the contact area and more equivalent friction bonding of the bonding material in which to composed have a.
[0010]
According to the first and second aspects of the present invention, the following actions (a) and (b) are obtained.
(A) between the beam head and building unit of high strength bolts, the high force by the interposed reinforcing washer to each between the beams nut and building unit, into the interior of the beam the reinforcing beam and the building unit The axial force transmission range of the bolt is expanded, and the contact area of the friction joint between the reinforcing beam and the building unit beam is increased even if the diameter of the bolt pilot hole provided in the reinforcing beam and the building unit beam is larger than the standard specification. Can be larger than the standard specification. Thereby, the friction joining force between the reinforcing beam and the beam of the building unit can be increased, and consequently the fastening strength can be increased.
[0011]
(B) From (a) above, it is possible to increase the allowable range of the bolt pilot hole diameter of the reinforcing beam that is the material to be joined and the beam of the building unit, and to increase the pre-processing rate in the bolt pilot hole factory or the like. Can do. Therefore, it is not necessary to perform on-site processing of the bolt pilot hole, and the workability can be greatly improved.
[0012]
According to the third aspect of the present invention, there is the following action (c) .
(C) The outer diameter of the reinforcing washer is a large diameter capable of ensuring at least equal to or greater than the contact area of the material to be joined determined from the axial force transmission range of the high-strength bolt within the allowable range of the bolt pilot hole diameter. By doing so, the axial force transmission range of the high-strength bolt to the inside of the material to be joined can be expanded, and the contact area of the friction joint between the materials to be joined can be expanded.
[0013]
In addition, the thickness of the reinforcing washer should be increased to ensure that the contact area of the material to be welded is equal to or greater than the frictional joint contact area determined from the axial force transmission range of the high-strength bolt with the bolt pilot hole diameter within the allowable range. Thus, the axial force of the high strength bolt can be reliably transmitted to the contact surface of the material to be joined, and deformation of the reinforcing washer itself can be suppressed.
[0014]
In addition, the inner diameter of the reinforcing washer is preferably a shaft diameter such that the shaft of the high-strength bolt can be inserted from the viewpoint of fastening strength.
[0015]
Moreover, according to this invention of Claims 1-3 , there exists an effect | action of following (d) further .
(D) When the reinforcing beam is frictionally joined to the building unit using high-strength bolts, by using the reinforcing washer, the above-described functions (a) to (c) are obtained, thereby greatly improving the workability of the unit building. It can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic diagram showing a first embodiment of the present invention, FIG. 2 is a schematic diagram showing a conventional example, FIG. 3 is a schematic diagram showing a unit building and a building unit in the second embodiment of the present invention, and FIG. FIG. 5 is a schematic diagram showing a lower floor reinforcement beam, FIG. 6 is a schematic diagram showing a lower floor reinforcement structure, and FIG. 7 is an end connection structure of a lower floor reinforcement beam. FIG. 8 is a schematic diagram showing the central connection structure of the lower floor reinforcing beam, FIG. 9 is a schematic diagram showing the mounting structure of the upper floor building unit, and FIG. 10 is the process of connecting the reinforcing beam to the upper floor building unit. FIG. 11 is a schematic diagram showing the upper floor reinforcing beam, and FIG. 12 is a schematic diagram showing the action of the upper floor reinforcing beam.
[0017]
(First Embodiment) (FIG. 1)
FIG. 1 shows an application of the present invention to a joint structure portion of a building structure material using high-strength bolts. Bolt pilot holes 5 are provided in three members to be joined 4A to 4C, which are building structure materials such as beams, These members 4A to 4C are frictionally joined and fastened by the high-strength bolt 1, the nut 2, and the washer 3 inserted through the bolt pilot hole 5.
[0018]
At this time, in this embodiment, the reinforcing washers 101 and 102 are interposed between the head 1A of the high-strength bolt 1 and the material to be joined 4B and between the nut 2 and the washer 3 and the material to be joined 4C, respectively. When the shaft diameter of the high-strength bolt is 16 mm and the pilot hole diameter 5d is 24 mm, which exceeds the allowable range of the pilot hole diameter, the reinforcing washers 101 and 102 are large and thick large washers, the outer diameter is 50 mm, The wall thickness is preferably 22 mm. Further, the contact area of the friction bonding of the materials to be joined 4B and 4C determined from the axial force transmission range of the high-strength bolt 1 from the relationship of the pulling strength is that the head 1A of the high-strength bolt 1 and the reinforcing washers 101 and 102 are. It must be larger than the contact area. The washer 3 may be omitted.
[0019]
According to the present embodiment, there are the following actions (a) to (c) .
(A) Since the reinforcing washer is interposed between the head of the high-strength bolt 1 and the materials to be joined 4A to 4C and between the nut 2 and the materials to be joined 4A to 4C, the materials to be joined 4A to 4C Bolt pilot holes provided in the materials to be joined 4A to 4C by expanding the axial force transmission range of the high strength bolt 1 to the inside (the range surrounded by the oblique lines L1, L2 starting from the outer edges of the reinforcing washers 101, 102). Even if the diameter 5d of 5 is larger than the standard specification, the contact area of the friction bonding between the materials to be joined 4A to 4C can be made equal to or larger than the standard specification. Thereby, the friction joining force between the to-be-joined materials 4A-4C can be enlarged, and a fastening strength can be enlarged by extension.
[0020]
(B) From said (a) , the tolerance | permissible_range of the diameter 5d of the bolt pilot hole 5 of the to-be-joined materials 4A-4C can be taken large, and the pre-processing rate in the factory etc. of the bolt pilot hole 5 can be made high. it can. Therefore, it is not necessary to perform on-site processing of the bolt pilot hole 5, and the workability can be greatly improved.
[0021]
(C) The contact area of the friction bonding of the materials to be joined 4A to 4C determined from the axial force transmission range of the high-strength bolt 1 when the outer diameter of the reinforcing washers 101 and 102 is within the allowable range of the diameter 5d of the bolt pilot hole 5 The diameter of the high-force bolt 1 to the inside of the materials to be joined 4A to 4C is expanded, and the contact area of the friction joint between the materials to be joined 4A to 4C is increased. Can be expanded.
[0022]
Further, the contact area of the friction bonding of the bonding material 4A~4C the diameter 5d of the bolt under the hole 5 of the wall thickness of the reinforcement washer 101, 102 in the allowable range, is determined from the axial force transmission range of high-strength bolts 1 Therefore, the axial force of the high-strength bolt 1 can be reliably transmitted to the contact surfaces of the materials to be joined 4A to 4C, and deformation of the reinforcing washer can be suppressed.
[0023]
Second Embodiment (FIGS. 3 to 12)
An embodiment in which the present invention is applied to a joint structure of unit buildings will be described.
(Unit building and building unit) (Figure 3)
As shown in FIG. 3 (A), the unit building 10 transports a plurality of standard building units 11 and pillar-omitted building units 12 produced in the factory to a construction site and horizontally and vertically on a pre-installed foundation 13. The lower floor portion 10A and the upper floor portion 10B are constructed adjacent to each other in the direction.
[0024]
As shown in FIG. 3 (B), the standard building unit 11 has four square steel pipe columns 21, four shaped steel floor beams 22, and four shaped steel ceiling beams 23 in a box shape. It is a joined frame structure. In the building unit 11, the floor beams 22 that intersect each other are connected to the lower end portion of the column 21 by the joint piece 22 </ b> A at the four corner portions, and the ceiling beams 23 that intersect each other are joined to the upper end portion of the column 21 by the joint piece 23 </ b> A. Configured.
[0025]
As shown in FIG. 3C, the pillar omitted building unit 12 is obtained by omitting one of the four pillars 21 of the standard building unit 11. The pillar-omitted building unit 12 is such that, at three corner portions other than the column-omitted corner portion, the crossing floor beam 22 is joined to the lower end portion of the column 21 by the joint piece 22A, and the crossing ceiling beam 23 is joined to the joint piece 23A. Are joined to the upper end portion of the column 21, and the crossing floor beam 22 is joined to the short column 24 by the joint piece 22B in the column omitted corner portion, and the crossing ceiling beam 23 is joined to the short column 25 by the joint piece 23B. Constructed by joining. And in the pillar abbreviation building unit 12, the temporary pillar 26 is detachably attached to the pillar abbreviation corner. The temporary pillar 26 is detachably coupled to the short pillar 24 and the short pillar 25 described above by attaching and detaching means such as bolts and pins.
[0026]
(Lower part 10A of unit building 10) (FIGS. 4 to 8)
However, the unit building 10 is placed in a part of the lower floor portion 10A so that the column-omitted corner portions of the four column-omitted building units 12 face each other at the column-omitted joint 14 as shown in FIG. In addition, a wide and continuous living room space that is not obstructed by the pillars 21 by the four pillar-omitted building units 12 is formed. Hereinafter, the joint structure of the four column omitted building units 12 will be described.
In the lower floor portion 10 </ b> A of the unit building 10, the column omitted joint portions 14 of the four column omitted building units 12 are reinforced by lower floor reinforcing beams 30. As shown in FIG. 5, the lower floor reinforcing beam 30 is made of a long plate material, and as shown in FIGS. 4 and 6, the two building units 12 adjacent to each other on the left and right sides of the column omit joint 14 are formed. Provided between the ceiling beams 23 and 23 and between the ceiling beams 23 and 23 of the other two building units 12 adjacent to each other on the left and right sides. In FIG. 6, 15 is a lower floor ceiling board, 16 is an upper floor board.
[0027]
As shown in FIG. 7, both ends of the lower-level reinforcing beam 30 are connected to the columns 21 of the two building units 12 adjacent to each other on the left and right sides of the column omit joint 14 and the other of the column omit joint 14. It is connected to each of the pillars 21 of the two building units 12 adjacent to each other on the side. At this time, both ends of the reinforcing beam 30 are connected to the column 21 through high-strength bolt joint (friction joint) between the ceiling beam 23 using the high-strength bolt 31 and the joint piece 23A.
[0028]
When joining with the high-strength bolt 31, a bolt pilot hole 31A is provided in the ceiling beam 23, the joint piece 23A and the reinforcement beam 30 of each of the two building units 12 facing each other with the reinforcement beam 30 interposed therebetween. The ceiling beam 23, the joint piece 23 </ b> A, and the reinforcing beam 30 are frictionally joined by the inserted high strength bolt 31 and nut (not shown). Then, large-diameter and thick reinforcing washers 101 and 102 similar to those in the first embodiment are interposed between the head of the high-strength bolt 31 and the ceiling beam 23 and between the nut and the ceiling beam 23, respectively. .
[0029]
As shown in FIG. 8, the column omit corner portions of the four building units 12 are connected to the central portion of the reinforcing beam 30. At this time, the central portion of the reinforcing beam 30 is connected to the short column 25 via a joint between the ceiling beam 23 and the joint piece 23 </ b> B using the high-strength bolt 32.
[0030]
When joining with the high-strength bolt 32, a bolt pilot hole 32A is provided in the ceiling beam 23, the joint piece 23B, and the reinforcement beam 30 of each of the two building units 12 facing each other across the reinforcement beam 30, and the bolt pilot hole 32A is provided in the bolt pilot hole 32A. The ceiling beam 23, the joint piece 23 </ b> B, and the reinforcing beam 30 are frictionally joined by the inserted high strength bolt 32 and nut (not shown). Then, large-diameter and thick reinforcing washers 101 and 102 similar to those in the first embodiment are interposed between the head of the high-strength bolt 32 and the ceiling beam 23 and between the nut and the ceiling beam 23, respectively. .
[0031]
When the reinforcing beam 30 is connected to the column 21 and the short column 25 as described above, a temporary column 26 that is detachably attached to the short column 25 is still joined to the column omitted corner portion of each building unit 12. Then, after the reinforcing beam 30 is completely connected to the column 21 and the short column 25, the temporary column 26 is removed from the short column 25.
[0032]
Note that the reinforcing beam 30 may be a bolt or the like even in a portion where the two adjacent building units 12 and 12 adjacent to each other with the reinforcing beam 30 between them and the joint beams 23A and 23B are not provided. May be joined.
[0033]
(Mounting of the upper floor portion 10B to the lower floor portion 10A of the unit building 10) (FIG. 9)
When the unit building 10 is mounted with the upper floor portion 10B on the lower floor portion 10A, the four upper floor pillar omitted building units 12 that constitute a part of the lower floor portion 10A are The floor standard building unit 11 can be mounted (FIG. 9A). At this time, the four upper-floor building units 11 have the lower end surfaces of the three columns 21 of the upper-floor building unit 11 at the three corner portions other than the column-omitted corner portions of the four lower-floor building units 12. It is placed on and joined to the upper end surfaces of the three pillars 21 of the lower-floor building unit 12, and the lower end surface of one pillar 21 of the upper-floor building unit 11 is placed at the lower corner of the lower-floor building unit 12. It is placed and coupled to the upper end surface of the short column 25 of the floor building unit 12 (FIG. 9B).
[0034]
At this time, as shown in FIG. 9C, the height of the lower-level reinforcing beams 30 reinforcing the four lower-level building units 12 is set to the floor beams 22 and 22 adjacent to the upper-level building unit 11. The lower floor reinforcing beam 30 can be connected to the floor beam 22 and the joint piece 22A of the upper floor building unit 11 by the high-strength bolt 33.
[0035]
When joining with the high strength bolts 33, bolt floor holes 33A are provided in the floor beams 22, joint pieces 22A and the reinforcing beams 30 of the two building units 12 facing each other with the reinforcing beams 30 interposed therebetween. The floor beam 22, the joint piece 22A, and the reinforcing beam 30 are friction-joined by the high-strength bolt 33 and the nut (not shown) to be inserted. And the large diameter thick reinforcing washer 101, 102 similar to that in the first embodiment is interposed between the head of the high strength bolt 33 and the floor beam 22, and between the nut and the floor beam 22, respectively. .
[0036]
Note that the height of the lower floor reinforcing beam 30 that reinforces the four lower floor building units 12 is merely extended between the adjacent floor beams 22 and 22 of the upper floor building unit 11. Also good. At this time, the above-described extending portion of the lower floor reinforcing beam 30 is simply sandwiched between the floor beam 22 and the joint piece 22A of the upper floor building unit 11, and the high strength bolt 33 is not used.
[0037]
(Reinforcement of the upper floor portion 10B above the lower floor portion 10A) (FIGS. 10 to 12)
When the four upper standard building units 11 are mounted on the four lower floor column omitted building units 12 as described above, the ceiling provided with the reinforcing beams 30 of the lower building units 12 as shown in FIG. Upper floor reinforcing beams 40 can also be provided between the ceiling beams 23 and 23 of the upper floor building unit 11 located on the same plane as the space between the beams 23 and 23.
[0038]
As shown in FIG. 11, the upper floor reinforcing beam 40 is made of a long T-shaped member having a T-shaped cross section, and, as shown in FIG. Provided between the ceiling beams 23 and 23 and between the ceiling beams 23 and 23 of the two building units 11 adjacent to each other on the left and right sides. In FIG. 11, 17 is an upper floor ceiling board.
[0039]
Each of the both ends and the center of the upper floor reinforcing beam 40 is connected to each column 21 of the two adjacent building units 11 in the same manner as the both ends of the lower floor reinforcing beam 30 shown in FIG. And the ceiling beam 23 using the reinforcing washer and the joint piece 23A are connected to each other.
[0040]
In addition, the upper floor reinforcing beam 40 is not limited to the ceiling beams 23 and 23 adjacent to each other and the two building units 11 and 11 adjacent to each other with the reinforcing beam 40 interposed therebetween. May be joined.
[0041]
According to this, the adjacent building units 11 are integrated by the upper floor reinforcing beam 40, and the upper floor is suspended through the pillars 21 at the center of the four building units 11 (FIG. 12C )) The load on the upper floor to the column omitted central part of the four lower floor building units 12 is reduced. If the upper floor reinforcing beam 40 is not provided, the connection between the reinforcing beam 30 of the lower floor building unit 12 and the column 21 and ceiling beam 23 of the lower floor building unit 12 is broken by the breakage of the high-strength bolts 31 and 32. (FIG. 12 (A)), the ceiling structure strength of the central part of the lower floor building unit 12 where the pillars are omitted may decrease, and the floor of the upper floor building unit 11 may fall as shown in FIG. 12 (B). is there. By providing the upper floor reinforcement beam 40, it is possible to prevent the floor of the upper floor building unit 11 from falling.
[0042]
Therefore, in the present embodiment, the ceiling beam 23, the joint piece 23A and the reinforcing beam 30 are joined by the high strength bolts 31, 32, 33, the ceiling beam 23, the joint piece 23B and the reinforcing beam 30 are joined, Since the reinforcing washers 101 and 102 are used when the floor beam 22, the joint piece 22A and the reinforcing beam 30 are joined (the same is applied to the ceiling beam 23, the joint piece 23A and the reinforcing beam 40), the above-described first embodiment is used. Similarly, the allowable range of the diameters of the bolt pilot holes 31A, 32A, and 33A can be expanded, the pre-processing rate in the factory of the bolt pilot holes 31A, 32A, and 33A can be increased, and workability can be greatly improved.
[0043]
Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention. For example, the members to be joined using the high strength bolt and the reinforcing washer of the present invention may be composed of a combination of two or more pieces.
[0044]
【The invention's effect】
As described above, according to the present invention, in the joint structure using high-strength bolts, the allowable range of the bolt pilot hole diameter is expanded, the pre-processing rate in the bolt pilot hole factory is increased, and the workability is greatly improved. can do.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a conventional example.
FIG. 3 is a schematic diagram showing a unit building and a building unit according to a second embodiment of the present invention.
FIG. 4 is a schematic diagram showing a process of connecting a reinforcing beam to a lower building unit.
FIG. 5 is a schematic view showing a lower floor reinforcing beam.
FIG. 6 is a schematic view showing a lower floor reinforcing structure.
FIG. 7 is a schematic diagram showing an end connection structure of a lower-level reinforcing beam.
FIG. 8 is a schematic diagram showing a connection structure at the center of a lower-level reinforcing beam.
FIG. 9 is a schematic diagram showing a mounting structure for an upper-floor building unit.
FIG. 10 is a schematic diagram showing a process of connecting a reinforcing beam to an upper-floor building unit.
FIG. 11 is a schematic diagram showing an upper floor reinforcing beam.
FIG. 12 is a schematic view showing the operation of the upper floor reinforcing beam.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High strength bolt 2 Nut 4A-4C To-be-joined material 5 Bolt pilot hole 101,102 Reinforcement washer 10 Unit building 12 Building unit 30, 40 Reinforcement beam

Claims (3)

In the unit building constructed of a plurality of building units adjacent installed between between beams two neighboring amino building unit at the right and left one side of the beam phase Tonariru building unit at the left and right on the other side Reinforcement beams are arranged so as to extend over each of the two building units facing each other across the reinforcement beams, and bolt reinforcement holes with a diameter larger than the allowable range are provided in each of the reinforcement beams, and the head of the high strength bolt and between the beams of a building unit, interposed reinforcing washer to each between the beams nut and building unit, friction reinforcing beam to the beam of their building unit by high-strength bolts and nuts that are inserted through the bolt prepared hole A unit building characterized by joining. In a unit building constructed by installing a plurality of building units adjacent to each other, at least one column omitting corner portion determined for each of the plurality of building units is disposed adjacent to each other at a column omitting joint, and adjacent to each other. over during the phase Tonariru ceiling beam at the left and right on the other side from between the roof beams of one to 2 substituents at phase Tonariru side of the building units of the left and right is located in the same plane containing the column omission joints of the building units Place the reinforcing beam so that
The ceiling beam of each of the two building units facing each other with the reinforcing beam in between, and a bolt pilot hole with a diameter larger than the allowable range are provided in each of the reinforcing beams , between the head of the high strength bolt and the ceiling beam of the building unit, interposed reinforcing washer to each between the ceiling beam of the nut and the building unit, to become frictionally bonded to the ceiling beams thereof building units reinforcing beam by high-strength bolts and nuts that are inserted through the bolt prepared hole Characteristic unit building.   The reinforcing washer has an outer diameter and a wall thickness that can secure a contact area for friction welding of the material to be joined, which is determined from the axial force transmission range of the high-strength bolt, with the bolt pilot hole diameter within an allowable range. The building unit according to claim 1, wherein the building unit is formed.

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