JP6730404B2 - Building joint structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining plate that joins prefabricated living units to each other to form a building, and a joining structure for the building.

Conventionally, a so-called prefabricated house in which members produced in a factory are assembled on site to build a house is widely known. However, when it comes to constructing houses on the third floor and above, it was difficult to construct by the prefabricated method. Therefore, in a three-story house, it was made up of reinforcing bars and steel frames, and at most, it was enough to produce partial members such as steel members, floor members, wall members, etc. at the factory and join them on site. .. In addition, in the case of the conventional connecting structure of the living units in the unit type construction, the connecting structure for building a three-story house is a structure in which the upper and lower living units are connected with one bolt. (Patent Document 1).

Japanese Patent Laid-Open No. 8-284260

However, when a building is constructed by combining living units by the conventional technology, a slight shift in the joint position between the living units may cause a distortion of the entire building, leading to a decrease in reliability for long-term maintenance of the building. It was a problem.

Therefore, as a means for solving the above problems, the building joint plate according to the present invention forms a living space by a hollow steel pipe column whose upper end is closed by a stigma diaphragm and whose lower end is closed by a column base diaphragm, and a beam. When the plurality of living units are located in the lower left, lower right, upper left, and upper right of the joining center of the respective steel pipe columns, the lower left living unit, the lower right living unit, the upper left living unit, and the upper right living unit are joined together. A joint plate constituting a building, which has a left side portion and a right side portion with the joint center as a boundary, and a left guide pin insertion hole, a left side alignment hole, and a left side bolt through hole are formed in the left side portion. A right guide pin insertion hole, a right alignment hole, and a right bolt through hole are formed in the right portion.

Further, as a means for solving the above problems, the building joint structure according to the present invention has a hollow steel pipe column whose upper end is closed by a stigma diaphragm and whose lower end is closed by a column base diaphragm, and a living space formed by a beam. A plurality of living units to arrange the respective steel pipe columns at the lower left, lower right, upper left, and upper right of the joining center, and the lower left living unit, the lower right living unit through the joining plate installed at the joining center, A joining structure of a building in which the upper left living unit and the upper right living unit are joined to form a building, wherein the joining plate has a left side portion and a right side portion with the joining center as a boundary, and the left side portion, left guide pin insertion holes, the left positioning hole, and the left bolt through holes are formed, on the right side, the right guide pin insertion hole, right positioning hole, and the right bolt through holes are formed, the left alignment The upper opening end of the hole and the right side alignment hole is chamfered in a shape that expands upward, and the left guide pin insertion hole, the left side alignment hole, and the left side bolt are formed in the stigma diaphragm of the lower left steel pipe column. A lower left guide pin mounting hole, a lower left position reference hole, and a lower left bolt fixing hole are formed at positions corresponding to the through holes.The right guide pin insertion hole and the right alignment hole are formed in the stigma diaphragm of the lower right steel pipe column. , And a lower right guide pin mounting hole, a lower right position reference hole, and a lower right bolt fixing hole are formed at positions corresponding to the right bolt through hole, and the joining plate penetrates the lower left guide pin mounting hole. From the stigma diaphragm of the right lower steel pipe column through the right lower guide pin mounting hole while inserting the left guide pin protruding upward from the stigma diaphragm of the lower left steel pipe column through the left guide pin insertion hole. The right guide pin protruding upward is inserted into the right guide pin insertion hole to be installed in a state where the upper end surface of the lower left steel pipe column and the upper end face of the lower right steel pipe column are bridged, and the joint in the bridged state At the position of the plate, a left alignment pin having a head portion whose diameter increases upward from the shaft portion from the left alignment hole to the lower left position reference hole is driven in from above to below the head. The lower surface of the portion and the chamfered surface of the left alignment hole are in close contact with each other, and a head portion is formed in which the diameter is expanded upward from the shaft portion from the right alignment hole to the lower right position reference hole. The right alignment pin is driven from top to bottom to bring the lower surface of the head into close contact with the chamfered surface of the right alignment hole. To become the upper left residential unit, the pedestal diaphragm upper left tubular columns, as well as through the left guide pin in the upper-left guide pin mounting hole formed at a position corresponding to the left guide pin insertion hole, the left The left upper fixing unit is joined by the left fixing bolt inserted in the upper left bolt fixing hole formed at a position corresponding to the left bolt through hole in a state of being placed on the alignment pin, and the upper right living unit is In the column base diaphragm of the upper right steel pipe column, the right guide pin is inserted through an upper right guide pin mounting hole formed at a position corresponding to the right guide pin insertion hole, and is placed on the right alignment pin. In this state, the lower right housing unit is joined by a right fixing bolt inserted into an upper right bolt fixing hole formed at a position corresponding to the right bolt through hole.

In the joining structure, the inner diameter of the upper left bolt fixing hole is formed slightly larger than the inner diameter of the lower left bolt fixing hole, and the inner diameter of the upper right bolt fixing hole is slightly larger than the inner diameter of the lower right bolt fixing hole. A left hat washer having a through hole through which the left side fixing bolt is formed, which is formed, and is composed of a flange portion and a tubular portion extending downward from the lower end of the collar portion, from the flange portion to the lower end of the tubular portion, The tubular portion is fitted between the left side fixing bolt and the upper left bolt fixing hole, and the flange portion is in contact with the upper end portion of the upper left bolt fixing hole, and the flange portion and the flange portion are formed. A right-sided hat-type washer having a through-hole through which the right-hand side fixing bolt can be inserted from the flange portion to the lower end of the tubular portion, and the tubular portion is fixed to the right-hand side. It is preferable that the flange is fitted between the bolt and the upper right bolt fixing hole, and the collar portion is in contact with the upper end of the upper right bolt fixing hole .

According to the present invention, even when a building in which a large number of living units are joined in the horizontal direction and the vertical direction is constructed, the living units are aligned with high accuracy and a distortion-free building can be realized. It is possible to realize a joint structure of buildings.

Furthermore, by realizing a building that is free from distortion resulting from the joining of the living units, it is possible to improve the reliability of the building constructed by assembling the living units for long-term maintenance.

It is a top view (a) and AA sectional drawing (b) of joining board 2. The dashed-dotted line shown at right angles to the long sides in the plan view (a) and the AA sectional view (b) is the left-right center line of the joining plate 2. It is a longitudinal cross-sectional view which shows the outline of the joining structure 1, and is a figure which shows a mode just after joining the steel pipe pillar 16d after joining the steel pipe pillars 16a to 16c to the joining plate 2. It is the top view (a) of HAT type washer 34 (37), BB sectional drawing (b), and (c) The perspective view seen from lower part. It is a perspective view which shows the external appearance of the joining structure 1 which the residence units 15a-15d are joined. It is a perspective view which shows the positional relationship of the residence units 15a-15d which comprise the building D.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In this specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.

FIG. 1 is a diagram showing a structure of a joint plate 2 which constitutes a joint structure 1 according to the present invention. The joining plate 2 has a left side portion 4 and a right side portion 5 with a joining center 3 set at the center of the plane as a boundary. In the present embodiment, as shown in FIG. 1A, the joining plate 2 is a flat plate-shaped steel plate having a rectangular planar shape, and the joining center 3 is indicated by a chain line in FIG. The point is located at the left-right center, which is the center of the long side of the plane of the joining plate 2 shown, and at the center of the short side.

Two left side bolt through holes 6 and 6 are formed in the left and right center of the left side portion 4 at positions equidistant from the joining center 3 and spaced from each other. Further, the left side portion 4 is formed with a left side guide pin insertion hole 7 on the center line of the short side length, on the joint center 3 side from the left side bolt through holes 6, 6, and on the short side 8 side on the left side. The alignment hole 9 is formed.

On the other hand, two right bolt through holes 11, 11 are formed at equal distances from the joint center 3 on the right and left center line of the right side portion 5 so as to be separated from each other. Further, on the right side portion 5, a right guide pin insertion hole 12 is formed on the center line of the short side length, on the joint center 3 side from the right bolt through holes 11, 11, and on the short side 13 side, the right side. The alignment hole 14 is formed.

The left side bolt through holes 6 and 6, the left side guide pin insertion hole 7 and the left side alignment hole 9, and the right side bolt through holes 11 and 11, the right side guide pin insertion hole 12 and the right side alignment hole 14 are shown in FIG. As shown in the sectional view A-A of b), the joining plate 2 is penetrated in the thickness direction. The left-side alignment hole 9 and the right-side alignment hole 14 are formed such that the flat-side open ends thereof are widened upward.

Next, the living unit 15 joined by the joining plate 2 will be described. As shown in FIGS. 4 and 5, the living unit 15 is provided with hollow steel pipe columns 16 at the four corners, the upper ends of which are closed by the stigma diaphragms 17 and the lower ends of which are pedestal diaphragms 18. A living space 20 is formed by a beam 19 connecting the steel pipe columns 16. The resident unit 15 is transported to the construction site of the building D and assembled in the factory in a state where the interior work not shown in FIG. 5 has been completed up to a predetermined process.

FIG. 2 shows a schematic view of a state where the four living units 15 transported to the construction site of the building D are joined to each other by the joining plate 2 to form the joining structure 1.

In the stigma diaphragm 17 of the steel pipe column 16, two bolt fixing holes 21 and 21 are formed apart from each other along the left-right center line of the stigma diaphragm 17. A guide pin mounting hole 22 is formed outside the living space 20 with the bolt fixing holes 21 and 21 interposed therebetween, and a position reference hole 23 is formed on the opposite side of the guide pin mounting hole 22.

Further, the column base diaphragm 18 of the steel pipe column 16 is formed with two bolt fixing holes 24, 24 spaced apart from each other along the left-right center line of the column base diaphragm 18. A guide pin mounting hole 25 is formed outside the living space 20 with the bolt fixing holes 24, 24 interposed therebetween. The right and left centerlines of the stigma diaphragm 17 and the pedestal diaphragm 18 are preferably based on the left and right side edges in the cross section of the outer peripheral wall of the steel pipe pillar 16.

In the following, from the joining center 3 set at the center of the joining plate 2, the lower left living unit 15 is the lower left living unit 15a, the lower right living unit 15 is the lower right living unit 15b, facing the plane of FIG. The left upper residence unit 15 is an upper left residence unit 15c, and the upper right residence unit 15 is an upper right residence unit 15d.

Further, regarding the lower left living unit 15a, the steel pipe column 16 and the stigma diaphragm 17 of the steel pipe column 16 are the lower left steel pipe column 16a and the stigma diaphragm 17a. Further, the holes provided in the stigma diaphragm 17a are referred to as lower left bolt fixing holes 21a, 21a, lower left guide pin mounting hole 22a, and lower left position reference hole 23a, respectively.

Similarly, regarding the lower right housing unit 15b, the steel pipe pillar 16 and the stigma diaphragm 17 of the steel pipe pillar 16 are the lower right steel pipe pillar 16b and the stigma diaphragm 17b. Further, the holes provided in the stigma diaphragm 17b are referred to as lower right bolt fixing holes 21b, 21b, lower right guide pin mounting hole 22b, and lower right position reference hole 23b, respectively.

Further, regarding the upper left living unit 15c, the steel pipe column 16 and the column base diaphragm 18 of the steel pipe column 16 are the upper left steel pipe column 16c and the column base diaphragm 18c. Further, the holes provided in the column base diaphragm 18c are referred to as upper left bolt fixing holes 24c, 24c and an upper left guide pin mounting hole 25c, respectively.

Similarly, for the upper right housing unit 15d, the steel pipe pillar 16 and the pillar base diaphragm 18 of the steel pipe pillar 16 are the upper right steel pipe pillar 16d and the pillar base diaphragm 18d. Further, the holes provided in the column base diaphragm 18d are referred to as upper right bolt fixing holes 24d and 24d and an upper right guide pin mounting hole 25d, respectively.

Further, the lower left bolt fixing holes 21a, 21a and the upper left bolt fixing holes 24c, 24c correspond to positions where the centers of the holes are vertically aligned when the upper left living unit 15c is stacked on the lower left living unit 15a. Formed. Further, the lower left guide pin mounting hole 22a and the upper left guide pin mounting hole 25c also correspond to the positions where the centers of the holes vertically match when the upper left living unit 15c is stacked on the lower left living unit 15a. It is formed.

Similarly, the lower right bolt fixing holes 21b, 21b and the upper right bolt fixing holes 24d, 24d are positions where the centers of the holes are vertically aligned when the upper right living unit 15d is stacked on the lower right living unit 15b. It is formed corresponding to. Further, the lower right guide pin mounting hole 22b and the upper right guide pin mounting hole 25d also correspond to the positions where the centers of the holes are vertically aligned when the upper right residential unit 15d is stacked on the lower right residential unit 15b. Formed.

Next, a procedure for forming the joint structure 1 will be described. First, the lower left living unit 15a and the lower right living unit 15b are installed with the lower left steel pipe column 16a and the lower right steel pipe column 16b arranged close to each other on the left and right. Next, the left guide pin 26 is penetrated from below the lower left guide pin mounting hole 22a and screwed to be mounted. The left guide pin 26 is further securely fastened to the stigma diaphragm 17a by a nut 26a. Further, the right guide pin 27 is also screwed into and attached to the lower right guide pin mounting hole 22b while being penetrated from below. The right guide pin 27 is further securely fastened to the stigma diaphragm 17b by a nut 27b.

Then, the left guide pin insertion hole 7 and the right guide pin insertion hole 12 of the joint plate 2 are inserted into the left guide pin 26 and the right guide pin 27 projecting upward from the stigma diaphragm 17a and the stigma diaphragm 17b, respectively. Install 2. Thereby, the joining plate 2 is installed in a state where the upper end surfaces of the lower left steel pipe column 16a and the lower right steel pipe column 16b are bridged.

In the joining plate 2 installed on the upper end surfaces of the lower left steel pipe column 16a and the lower right steel pipe column 16b, the left bolt through holes 6 and 6 and the left lower bolt fixing holes 21a and 21a, respectively, and the centers of the holes are substantially vertical. It is formed so as to correspond to the matching position. Further, the centers of the left side alignment hole 9 and the lower left position reference hole 23a are formed in the vertical direction so as to correspond to substantially the same position. Further, the right side bolt through holes 11 and 11 are formed corresponding to the positions where the centers of the lower right side bolt fixing holes 21b and 21b are substantially aligned in the vertical direction. Furthermore, the right side alignment hole 14 and the lower right position reference hole 23b are formed so that the centers of the holes in the vertical direction substantially correspond to each other. The center position of the left alignment hole 9 and the lower left position reference hole 23a shifts in the vertical direction, and the center position of the right alignment hole 14 and the lower right position reference hole 23b shifts in the vertical direction. Is 1 mm or less even when there is a deviation.

Here, when the left alignment pin 28 is driven from the left alignment hole 9 to the lower left position reference hole 23a, a vertical hole slightly generated between the left alignment hole 9 and the lower left position reference hole 23a. It is possible to match the deviation of the center positions of the. Similarly, when the right alignment pin 29 is driven from the right alignment hole 14 to the lower right reference hole 23b, the vertical direction slightly generated between the right alignment hole 14 and the lower right reference hole 23b. It is possible to match the deviation of the center positions of the holes.

This allows the lower left resident unit 15a and the lower right resident unit 15b to be installed on the left and right without any misalignment.

In addition, a flat head screw which is chamfered in a shape in which the upper opening end 9a of the left side alignment hole 9 widens upward, and a left positioning pin 28 allows the head to be fitted in close contact with the chamfered portion of the upper opening end 9a. The effect of eliminating the positional deviation can be further enhanced by being formed. Further, by forming the upper opening end 14a of the right side alignment hole 14 and the right alignment pin 29 in the same shape, it is possible to further improve the misalignment elimination effect.

After that, the upper left guide pin mounting hole 25c is inserted through the left guide pin 26, and the upper left residence unit 15c is stacked on the lower left residence unit 15a. Further, the left side fixing bolts 30, 30 are inserted from the lower left bolt fixing holes 21a, 21a through the left side bolt through holes 6, 6 into the upper left bolt fixing holes 24c, 24c, and are fastened with the nuts 31, 31, so that the lower left habitation is achieved. The upper left residence unit 15c is fixed on the unit 15a.

Further, as for the upper right residential unit 15d, the upper right guide pin mounting hole 25d is inserted through the right guide pin 27 to stack the upper right residential unit 15d on the lower right residential unit 15c. Next, the right fixing bolts 32, 32 are inserted from the lower right bolt fixing holes 21b, 21b through the right bolt through holes 11, 11 into the upper right bolt fixing holes 24d, 24d, and are fastened with the nuts 33, 33. The upper right residence unit 15d is fixed on the lower right residence unit 15b.

As described above, it is possible to realize the joining structure 1 in which the lower left living unit 15a, the lower right living unit 15b, the upper left living unit 15c, and the upper right living unit 15d are joined to each other by the joining plate 2 as illustrated in FIG. ..

According to the joint structure 1, the lower left resident unit 15a and the lower right resident unit 15b can be installed on the left and right without being completely displaced, and the upper left resident unit 15c and the upper right resident unit 15d can be accurately positioned. Since they can be stacked on the lower left resident unit 15a and the lower right resident unit 15b installed in, the resident units 15 can be aligned with each other with high accuracy, and a building D without distortion can be realized.

Further, similarly to the above, by expanding a combination of a plurality of the plurality of living units 15 vertically and horizontally, and configuring the joint structure 1 at each joint center 3 via the joint plate 2, It is possible to realize a large building D with a high-rise structure that is accurately aligned and has no distortion.

Further, the steel pipe columns 16a to 16d are provided with working holes H1, H3, H5 and H7 on their side walls, respectively. Further, the partition walls 40a to 40d formed inside the steel pipe columns 16a to 16d are provided with working holes H2, H4, H6 and H8, respectively. When assembling the living units 15a to 15d, the worker can insert his or her own arm or tool into the steel pipe column 16 through the work holes H1 to H8 to perform the work. Taking the steel pipe column 16a of the housing unit 15a as an example, an operator inserts an arm having a tool from the work hole H1 through the work hole H2 and attaches the left guide pin 26 and the left fixing bolt 30. Further, after installing the living unit 15c, the worker can insert the arm having the tool through the work hole H5 through the work hole H6 and screw the nut 31 into the left fixing bolt 30 to complete the work.

Further, as shown in FIG. 2, the inner diameter of the upper left bolt fixing hole 24c is made slightly larger than the inner diameter of the lower left bolt fixing hole 21a, and the hat type washer 34 is provided between the upper left bolt fixing hole 24c and the left fixing bolt 30. It is preferable to be able to fit.

As shown in FIG. 3, the hat-type washer 34 includes a collar portion 35 formed at the upper end and a tubular portion 36 extending downward from the lower end of the collar portion 35. It has a through hole extending to the lower end so that the left side fixing bolt 30 can be inserted.

As a result, the inner diameter of the upper left bolt fixing hole 24c can be formed to have a size larger than the specified inner diameter of the normal left fixing bolt 30. Therefore, the upper left living unit 15c can be formed with respect to the lower left living unit 15a. Even when they are stacked with a slight shift, it becomes easy to insert the left side fixing bolt 30 from the lower left bolt fixing hole 21a to the upper left bolt fixing hole 24c. Further, after inserting the left side fixing bolt 30 into the upper left bolt fixing hole 24c, while inserting the tubular portion 36 of the hat-type washer 34 from above between the upper left bolt fixing hole 24c and the left side fixing bolt 30, the nut 31 is screwed. By fitting them together, the hat-type washer 34 can be fitted until the collar portion 35 comes into contact with the upper end portion of the upper left bolt fixing hole 24c.

Therefore, even if the lower left living unit 15a and the upper left living unit 15c are slightly misaligned with respect to the vertical direction, the vertical positional relationship between them can be completely maintained.

Further, the effect of eliminating the deviation of the vertical positional relationship is that the inner diameter of the upper right bolt fixing hole 24d is made slightly larger than the inner diameter of the lower right bolt fixing hole 21b so that the collar portion 38 and the tubular portion are the same as the hat-type washer 34. By providing the hat-type washer 37 having 39 so that the hat-type washer 37 can be fitted therein, the hat-type washer 37 can be exerted between the lower right living unit 15b and the upper right living unit 15d.

That is, by adding the hat-type washers 34 and 37 to the joint structure 1, not only the positions of the living units 15 installed on the left and right are made accurate, but also the positions of the living units 15 stacked vertically are made accurate. Therefore, the living units 15 are aligned with each other with higher accuracy, and the building D without distortion can be realized.

Further, similarly to the above, a joining structure in which a combination of a larger number of the plurality of living units 15 is expanded vertically and horizontally and hat-type washers 34 and 37 are provided at the joining centers 3 via the joining plates 2. By configuring No. 1, it is possible to realize more accurate alignment, and to realize a large building D with high layers without distortion.

1 joining structure 2 joining plate 3 joining center 6 left side bolt through hole 7 left side guide pin insertion hole 9 left side alignment hole 11 right side bolt through hole 12 right side guide pin insertion hole 14 right side alignment hole 15a-15d resident unit 17a-17d stigma Diaphragm 18a-18d Column base diaphragm 30 Left side fixing bolt 32 Right side fixing bolt 34 Hat type washer 37 Hat type washer

Claims (2)

A hollow steel pipe column whose upper end is closed by a stigma diaphragm and its lower end is closed by a column base diaphragm, and multiple living units that form a living space by beams join the respective steel pipe columns to the lower left and lower right of the center. , The upper left, the upper right, and the upper left, the lower left resident unit, the upper left resident unit, and the upper right resident unit are joined through a joining plate installed at the joining center to join a building Structure,
The joint plate has a left side portion and a right side portion with the joint center as a boundary,
A left guide pin insertion hole, a left alignment hole, and a left bolt through hole are formed in the left portion,
On the right side portion, a right guide pin insertion hole, a right side alignment hole, and a right side bolt through hole are formed,
The upper opening ends of the left side alignment hole and the right side alignment hole are chamfered in a shape that expands upward,
The stigma diaphragm of the lower left steel pipe column has a lower left guide pin mounting hole, a lower left position reference hole, and a lower left bolt fixing hole at positions corresponding to the left guide pin insertion hole, the left alignment hole, and the left bolt through hole. Is formed,
On the stigma diaphragm of the lower right steel pipe column, the lower right guide pin insertion hole, the lower right position reference hole, and the right lower position are formed at positions corresponding to the right guide pin insertion hole, the right alignment hole, and the right bolt through hole. Lower bolt fixing hole is formed,
The joint plate penetrates the lower left guide pin mounting hole and inserts the left guide pin protruding upward from the stigma diaphragm of the lower left steel pipe column into the left guide pin insertion hole, and the lower right guide pin mounting The right guide pin protruding upward from the stigma diaphragm of the lower right steel pipe column through the hole is inserted into the right guide pin insertion hole to bridge the upper end face of the lower left steel pipe column and the upper end face of the lower right steel pipe column. Installed in the
In the position of the junction plate of the bridge states passed in the lower left alignment pin comprises a head formed by expanded upward than the shaft portion to the lower left position reference hole from the left positioning hole from above And the lower surface of the head and the chamfered surface of the left alignment hole are in close contact with each other, and spread upward from the shaft portion from the right alignment hole to the lower right reference hole. A right alignment pin including a head having a diameter is driven downward from above, and the lower surface of the head and the chamfered surface of the right alignment hole are in close contact with each other ,
The upper left housing unit inserts the left guide pin into an upper left guide pin attachment hole formed at a position corresponding to the left guide pin insertion hole in a column base diaphragm of an upper left steel pipe column, and also above the left alignment pin. By the left side fixing bolt inserted into the upper left bolt fixing hole formed at a position corresponding to the left side bolt through hole in a state of being mounted on the left lower living unit,
The upper right residential unit, the pedestal diaphragm upper right tubular columns, the right guide pin insertion hole and the corresponding upper right guide pin mounting hole formed in a position while inserting the right guide pin, the right positioning pins on The building is characterized by being joined to the lower right residential unit by a right fixing bolt inserted into an upper right bolt fixing hole formed at a position corresponding to the right bolt through hole when mounted on Joint structure. The inner diameter of the upper left bolt fixing hole is formed slightly larger than the inner diameter of the lower left bolt fixing hole,
The inner diameter of the upper right bolt fixing hole is formed slightly larger than the inner diameter of the lower right bolt fixing hole,
The left hat washer having a flange portion and a tubular portion extending downward from the lower end of the flange portion, and having a through hole through which the left side fixing bolt can be inserted from the collar portion to the lower end of the tubular portion is the tubular shape. A portion is fitted between the left side fixing bolt and the upper left bolt fixing hole, and the collar portion is in contact with the upper end portion of the upper left bolt fixing hole,
The right hat washer having a collar portion and a tubular portion extending downward from the lower end of the collar portion, and having a through hole through which the right fixing bolt can be inserted from the collar portion to the lower end of the tubular portion is the tubular hat. A portion is fitted between the right side fixing bolt and the upper right bolt fixing hole, and the flange portion is in contact with an upper end portion of the upper right bolt fixing hole. The joint structure for a building according to claim 1 .

Images