JP3663230B2 - Manufacturing method and manufacturing apparatus for joint member of building unit - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a manufacturing method and a manufacturing apparatus for a joint member of a building unit that joins a column and a beam constituting a framework of a building unit that is a component of a unit type building.
[0002]
[Background]
A unit type building is constructed by interconnecting a plurality of building units manufactured in advance in a factory at a construction site. The building unit of the unit type building is a box-like shape having a hexahedral frame formed of columns and beams. Such a building unit can be connected by a connection structure as shown in Japanese Patent Publication No. 6-47840.
Specifically, in each lower floor building unit, two guide pins are erected on the column heads of the columns constituting the framework. A connecting plate having a hole through which the guide pin of the building unit is inserted is bridged between the two lower-floor building units arranged adjacent to each other in the horizontal direction. Adjacent lower building units are connected to each other by inserting guide pins through the holes of the connecting plates. Here, the tip of the guide pin inserted through the hole of the connecting plate protrudes from the upper surface of the connecting plate.
On the other hand, the upper floor building unit mounted on each lower floor building unit has a hole formed in the column base portion of the column constituting the framework. The guide pins of the lower-floor building unit are inserted into the holes of the column bases, and in this state, the beams of the upper- and lower-floor building units are connected by a connector such as a bolt and a nut.
By the way, when a lateral load is applied to the building unit due to an earthquake or a wind, the lateral load may deform the joint between the column and the beam. For this reason, a box-shaped joint member is provided at a joint portion between the pillar and the beam, that is, at the end of the pillar. Rigidity that can withstand a lateral load is secured by the ceiling surface portion and the bottom surface portion which are horizontal surfaces of the box-shaped joint member. Further, the side portion of the joint member is provided with a joint for joining the beams, whereby the beams can be joined easily.
[0003]
[Problems to be solved by the invention]
However, the above-described joint member can be manufactured by casting. However, in the joint member obtained by casting, a joining surface for joining columns and beams is roughly formed, and sufficient accuracy is not ensured. For this reason, after the casting, post-processing such as polishing the surface is necessary, and there is a problem that the production efficiency is poor.
[0004]
The objective of this invention is providing the manufacturing method and manufacturing apparatus of the joint member of a building unit from which manufacturing efficiency becomes favorable.
[0005]
[Means for Solving the Problems]
1st invention of this invention is a manufacturing method of the joint member of a building unit which manufactures the box-shaped joint member which joins the pillar and beam which comprise the framework of a building unit, Comprising : A table composed of a plurality of plate-like parts including a main body part, a side part, and an internal part. Using a manufacturing apparatus having a pin, a metal plate material corresponding to each of the main body component, the side surface component, and the internal component is formed by stamping, and among the three surfaces of the main body component in the metal plate material for the main body component A plurality of through holes that can be used as positioning holes for determining the position of the building unit or bolt insertion holes for joining the building unit are provided on at least two surfaces of the The positioning pin is inserted into at least one of the through holes and the metal plate material for the main body component is positioned for the first bending, and then the other positioning pins are inserted into the other through holes. In the state of being inserted and positioned, a second bending process is performed to form the main body part which is bent into a U shape and has three sides opened, and the metal plate material for the internal part is bent into an L shape. After forming the part, one side of the body part is closed and the side part is welded, and two parts of the body part are closed and the internal part is welded.
In the above, press processing refers to general processing in which a workpiece is sandwiched between an upper die and a lower die, and one of these upper die and lower die is pressed toward the other in this state. Specifically, including punching and bending .
[0006]
On the other hand, the second invention of the present invention is formed in a box shape including a main body part having three surfaces opened by bending a metal plate material into a U-shape, and used for joining columns and beams constituting the framework of a building unit. a manufacturing apparatus of Joint members of the building unit for producing Joint member, and a table for placing the metal sheet, a plurality of positioning pins provided can project and retreat into the table top, the metal sheet the has a pair of upper and lower molds for bending, and the lower die of these, the main body part V-shaped groove corresponding to the bending angle of are mounted on the said upper die, the tip Is provided with a protrusion that fits into the groove of the lower mold, and at least two of the three surfaces of the main body part of the metal plate material for the main body part are provided with at least one through hole, respectively. Small number of through holes At least two of the plurality of positioning pins are used as positioning holes for determining the position of the building unit and bolt insertion holes for joining the building unit. The metal plate material for the main body component is positioned at the first bending position by inserting the through hole provided in one of the surfaces, and the other positioning pin is positioned on the two surfaces of the main body component. The metal plate material for the main body part can be positioned at the second bending position by being inserted through a through hole provided on the other surface of the main body .
In the above, the upper mold is provided so as to be movable in the vertical direction, and has an extending portion extending in the moving direction, and it is desirable that the intermediate portion of the extending portion is bent .
[0007]
[Action]
In the first invention of the present invention as described above, a plurality of plate-like parts constituting the joint member are formed with high precision by press working. A joint member with high accuracy is completed, and post-processing such as polishing the surface is not required, and the manufacturing efficiency is improved, thereby achieving the object.
Further, as a plate-like component, a main body part that is bent into a U-shape and opened on three sides, a side part that closes one side of the main body part, and an inner part that is bent into an L shape and closes two sides of the main body part If the parts are manufactured, all of the welded portions are exposed to the outside, and assembly by welding becomes easy.
Furthermore, if a positioning hole or the like for determining the position of the building unit is opened at the same time as the pressing process, the drilling process or the like is omitted, and the manufacturing efficiency is further improved.
[0008]
On the other hand, in the second invention of the present invention as described above, the lower mold having a V-shaped groove corresponding to the bending angle of the main body part, and the upper mold having a protrusion fitted to the lower mold groove, Since the sheet material is bent, the body part can be bent at a predetermined angle quickly and accurately when the body part is manufactured, thereby achieving the object.
Also, if the middle part of the extension part of the upper mold is bent, when the metal plate material bent into the L-shape is further folded into a U-shape, the tip bent into the L-shape is the extension of the upper mold. A U-shaped body part is reliably formed only by pressing without interfering with the protruding portion.
Furthermore, if at least one or more through holes are provided in the main body part, and a positioning pin inserted into the through hole is provided in the table of the manufacturing apparatus for processing the main body part so as to be able to project and retract, the main body of the table is provided. Positioning of the main body parts can be performed quickly and easily when placing the parts, and when the main body parts are ejected from the table, the positioning pins are immersed in the table so that the main body parts can be quickly ejected. And it becomes easy to do.
[0009]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a framework 2 of a building unit 1 according to the present embodiment. This framework 2 is formed into a ramen structure including four columns 3 erected at the four corners, and four upper beams 4 and lower beams 5 spanned between the upper and lower ends of the columns 3. It has been done. At the end of each column 3, a joint member 6 for joining with each of the upper beam 4 and the lower beam 5 is provided.
In the following description, for easy identification, the building unit 1 and its components 2 to 6 have “A” added to the end of the reference numerals for those placed on the lower floor. Those arranged on the upper floor have “B” at the end of the reference numerals.
[0010]
FIG. 2 shows a connecting structure of two lower-floor building units 1A and upper-floor building units 1B. The joint members 6A and 6B provided at the ends of the pillar 3A of the lower-floor building unit 1A and the pillar 3B of the upper-floor building unit 1B are box-shaped.
Two large and small guide pins 7 and 8 having different height dimensions and thickness are provided upright on the upper surface of the lower floor side joint member 6A. A connecting plate 9 is bridged between the upper ends of the columns 3A adjacent to each other in the two lower-floor building units 1A. The connecting plate 9 is formed with holes 10 and 11 through which the guide pins 7 and 8 are inserted.
The connecting plate 9 is bridged across the two lower building units 1A in a state where the guide pins 7 and 8 are inserted through the holes 10 and 11, respectively. From the upper surface of the connecting plate 9, the tips of the guide pins 7 and 8 protrude. The tips of the guide pins 7 and 8 are inserted into holes 12 and 13 formed in the lower surface of the joint member 6B of the upper floor building unit 1B placed on the lower floor building unit 1A.
Bolt insertion holes 14A, 14B, and 15 are provided in the upper surface of the joint member 6A, the lower surface of the joint member 6B, and the connecting plate 9, respectively. The lower floor building unit 1A and the upper floor building unit 1B are connected by inserting the bolt 16 through these bolt insertion holes 14A, 14B, 15 and screwing the nut 17 into the tip of the bolt 16.
[0011]
In FIG. 3, the joint member 6 is shown enlarged. In the figure, the joint member 6 is a plate-shaped part obtained by pressing a metal face material, a body part 21, a side part 22, a reinforcing part 23, an internal part 24, and a rib part 25 welded in a box shape. is there.
As shown in FIG. 4, the main body component 21 is obtained by bending a metal face material punched by pressing into a U shape by pressing, as shown in FIG. 5. In addition to the holes 12 and 13 and the bolt insertion holes 14 described above, the body part 21 is provided with joint portions 26 and 27 and a pair of jig holes 28 that form joints to which the beams 4 and 5 are joined. Yes.
The holes 12, 13, the bolt insertion hole 14, the joint portion 26, and the jig hole 28 are formed at the same time that the metal face material is punched out by pressing.
[0012]
Returning to FIG. 3, the side part 22 is a substantially rectangular plate-like part, and a joint part 29 that forms a joint with the joint part 27 of the main body part 21 is formed on one side edge thereof. Yes. The joint portion 29 is formed at the same time as the side part 22 is punched from a metal face material by press working.
The reinforcing component 23 is a substantially rectangular plate-shaped component that reinforces the surface of the main body component 21 on which the bolt insertion hole 14 is formed. The thickness of the reinforcing part 23 is made thicker than other parts such as the main body part 21 and the side part 22. The above-described bolt insertion hole 14 is also opened in the reinforcing component 23. The bolt insertion hole 14 of the reinforcing component 23 is opened when punched by press working.
The internal component 24 is a component that is housed inside the main body component 21 and bent into an L shape that connects the upper surface and the lower surface of the main body component 21. The bent portion of the internal part 24 is a part that is bent at the same time when the internal part 24 is punched into a substantially square shape by pressing.
The rib part 25 is a substantially trapezoidal part punched out by press working. By this rib component 25, the vicinity of the bolt insertion hole 14 of the main body component 21 and the side surface of the internal component 24 are connected. Thereby, the rigidity of the vicinity of the bolt insertion hole 14 through which the bolt 16 that joins the lower floor building unit 1A and the upper floor building unit 1B is inserted is ensured.
[0013]
Next, the manufacturing procedure of the joint member 6 will be described.
First, the main body part 21, the side part 22, the reinforcing part 23, the internal part 24, and the rib part 25 are manufactured by pressing the metal face material.
Next, as shown in FIG. 6, the side part 22 is welded to the U-shaped body part 21, and the side part 22 is welded to the body part 21 as shown in FIG. Weld.
At this time, the back nuts 31 and 32 are welded to the reinforcing member 23 of the joint member 6 provided on the upper end side of the column 3 in advance. The back nuts 31 and 32 of the reinforcing member 23 are welded to the holes 12 and 13 at the same position.
Subsequently, as shown in FIG. 8, the internal part 24 is welded to the inside of the main body part 21, whereby the space surrounded by the main body part 21 and the side part 22 is closed by the internal part 24, and the box A body part 21 having a shape is formed.
Thereafter, as shown in FIG. 9, the rib part 25 is welded to a position where the vicinity of the bolt insertion hole 14 of the main body part 21 and the side surface of the internal part 24 are connected. To complete.
In addition, about the joint member 6 provided in the upper end side of the pillar 3, the guide pins 7 and 8 are inserted in each of the holes 12 and 13 at the construction site, and the screw provided at the base of the guide pins 7 and 8 is provided. The shaft is screwed into the back nuts 31 and 32 inside the joint member 6, whereby the guide pins 7 and 8 are erected on the end face of the column head of the column 3.
[0014]
Next, a manufacturing apparatus used for manufacturing the joint member 6 will be described. FIG. 10 shows a manufacturing apparatus 40 for manufacturing the main body component 21 by processing a metal face material punched into a predetermined shape.
The production apparatus 40 is an apparatus for producing a U-shaped main body part 21 by bending a flat metal surface material in two places by performing a bending process twice with the upper mold 41 and the lower mold 42.
The manufacturing apparatus 40 is provided with a slide 43 to which an upper mold 41 is attached, a frame 50 that movably supports the slide 43, and a drive device 44 that drives the slide 43. Of these, the frame 50 includes a base 51 to which the lower mold 42 is fixed, supports 52 erected at the four corners of the base 51, and a thick plate-like holder 53 fixed to the upper end of the support 52 in the figure. It is comprised including.
[0015]
The base 51 is provided with a table 54 to which the lower mold 42 is attached. Guide rods 55 extending upward in the figure are provided at the four corners of the table 54.
On the other hand, the slide 43 is provided with a guide bush 56 through which the guide rod 55 is inserted, and a guide rod 57 extending upward in the drawing.
The holder 53 is provided with a drive bush 44 and a guide bush 58 through which the guide rod 57 of the slide 43 is inserted.
Here, in the slide 43, the guide bush 56 on the lower surface side is guided by the guide rod 55, and the guide rod 57 on the upper surface side is guided by the guide bush 58. As a result, the frame 50 can move only in the vertical direction. The drive device 44 is a fluid-driven cylinder device such as a hydraulic pressure, and the tip of the movable rod 45 is fixed to the slide 43. By operating the driving device 44, the upper die 41 is pressed toward the lower die 42.
[0016]
The table 54 of the base 51 includes a positioning device 61 for positioning the unfinished main body part 21 at a predetermined position, and a discharging member for discharging the bent main body part 21 to the outside of the table 54. 62 and a slide-like stocker 63 for receiving the discharged main body part 21 are provided.
At the lower end portion of the stocker 63, a fence-like stopper 64 that locks the discharged main body part 21 so as not to roll outward, and a cylindrical bumper that alleviates the impact of the main part 21 that has slipped down. 65 is provided.
[0017]
As shown in FIGS. 11 and 12, the lower die 42 fixed to the table 54 is provided with a V-shaped groove 46 corresponding to the bending angle of the body part 21.
On the other hand, the upper die 41 is provided with a protrusion 47 fitted to the groove 46 of the lower die 42 at the tip. Further, the extended portion 48 extending in the moving direction of the upper die 41 has a middle portion bent in a crank shape (see FIG. 12). As a result, when performing the second bending process, the tip 21C on the left side of the main body component 21 bent in the first folding process does not collide with the upper die 41.
[0018]
The positioning device 61 is configured to include positioning pins 66 to 68 provided on the surface of the table 54 so as to be able to project and retract. These positioning pins 66 to 68 are arranged at positions corresponding to the holes 12, the bolt insertion holes 14, and the jig holes 28 formed in the main body member 21.
The positioning pins 66 and 67 have base portions connected to operation portions 69 and 70 such as a hydraulic cylinder device and an electromagnetic plunger, and perform a projecting and retracting operation by the operation of the operation portions 69 and 70. The tip portions of the positioning pins 66 and 67 protrude from the surface of the table 54 when the main body component 21 is placed on the table 54 in performing the first bending process.
Here, the main body part 21 is accurately arranged at the bending position α of the lower die 41 by inserting the positioning pins 66 and 67 into the hole 12 and the bolt insertion hole 14 respectively. (See FIG. 11). Further, the tip portions of the positioning pins 66 and 67 are configured to be immersed in the table 54 when the first bending process is completed.
As with the positioning pins 66 and 67, the positioning pin 68 is connected to the operation portion 71 at the base portion, and performs a projecting and retracting operation by the operation of the operation portion 71. The tip end portion of the positioning pin 68 protrudes from the surface of the table 54 when the body part 21 in which the bending portion (a) has already been folded is placed on the table 54 in performing the second bending process.
Here, the main body part 21 in which the bent portion i is bent is inserted into the jig hole 28 with the positioning pin 68 so that the second bent portion b is accurately placed at the bending position α of the lower die 41. It has become. Further, the tip end portion of the positioning pin 68 is configured to be immersed in the table 54 when the second bending process is completed.
[0019]
The discharge member 62 is a square bar-like member extending in the width direction of the base 51. The right end of the discharge member 62 in the drawing is connected to a connection member 73 protruding from a slit 72 provided in the table 54. The slit 72 is an elongated hole extending in the depth direction of the base 51. The base of the connecting member 73 is connected to an operating device 74 (shown only in FIG. 12) such as a hydraulic cylinder device provided on the base 51 side. The discharge member 62 is connected to the operation device 74 via the connection member 73, and can be moved between the substantially rear end edge and the front end edge of the base 51 by the operation of the operation device 74.
The discharge member 62 is activated when the second bending process is completed, whereby the main body component 21 is pushed out of the table 54 and stocked in the stocker 63. ing.
[0020]
According to the present embodiment as described above, the following effects can be obtained.
That is, the main body part 21, the side part 22, the reinforcing part 23, the internal part 24, and the rib part 25 constituting the box-shaped joint member 6 are manufactured by pressing a metal face material. The plate-like parts can be mass-produced, and the manufacturing efficiency of the joint member 6 can be improved without impairing the processing accuracy of the joint member 6.
[0021]
Also, a body part 21 that is bent in a U-shape and has three sides opened, a side part 22 that covers one side of the body part 21, and an internal part 24 that is bent into an L shape and closes two sides of the body part 21 Since the joint member 6 is formed, all of the welded portions are exposed to the outside during welding, and assembly work by welding of the joint member 6 can be easily performed. 6 production efficiency can be improved.
[0022]
In addition, since the holes 12, 13, bolt insertion holes 14, joints 26, 27, jig holes 28, etc. were formed at the same time as the pressing of the main body parts 21, etc., no additional drilling is required, and further manufacturing Efficiency can be improved.
[0023]
Further, the manufacturing apparatus 40 for processing the main body part 21 has a lower mold 42 having a V-shaped groove 46 corresponding to the bending angle of the main body part 21 and a protrusion 47 that fits into the groove 46 of the lower mold 42. Since the upper die 41 is provided and the upper die 41 and the lower die 42 are sandwiched and sandwiched by the metal plate material, the body part 21 can be bent at a predetermined angle quickly and accurately when the main body part 21 is manufactured. From the point, it can contribute to the improvement of the manufacturing efficiency of the joint member 6.
[0024]
Further, since the intermediate portion of the extension portion 48 of the upper die 41 is folded, when the metal plate folded into an L shape is further folded into a U shape, the tip bent into the L shape is the upper die 41. The U-shaped main body part 21 can be reliably formed by only pressing, without interfering with the extended portion 48.
[0025]
In addition, a hole 12, which is a through-hole, a bolt insertion hole 14, and a jig hole 28 are provided in the main body part 21, while a positioning pin inserted into the hole 12, the bolt insertion hole 14, and the jig hole 28. Since 66 to 68 are provided so as to be able to project and retract on the table 54 of the manufacturing apparatus 40, when the main body part 21 is placed on the table 54, the main body part 21 can be positioned quickly and easily. If the positioning pins 66 to 68 are immersed in the table 54 when the main body part 21 is discharged from the main body 21, the main body part 21 can be automatically discharged by the discharge member 62, and the main body part 21 can be discharged quickly and easily. It can be done safely.
[0026]
Furthermore, while reinforcing the surface where the bolt insertion hole 14 of the main body part 21 is formed with the thick reinforcing part 23, the rib part 25 and the side part of the internal part 24 near the bolt insertion hole 14 of the main body part 21 As a result, the rigidity of the portion near the bolt insertion hole 14 of the main body part 21 is sufficiently secured, and the strength of the joint portions of the building units 1A and 1B joined up and down can be increased.
[0027]
The present invention has been described with reference to a preferred embodiment. However, the present invention is not limited to this embodiment, and various improvements and design changes can be made without departing from the scope of the present invention. .
For example, the joint portion of the joint member is not limited to the stepped shape formed by bending the end portion of the metal face material into a crank shape, and the distal end side is made thinner than the base end side. A stepped shape may be used, and a specific shape of the joint portion can be appropriately selected in practice.
[0028]
The driving device for driving the slide of the manufacturing apparatus is not limited to a direct acting type that directly drives the slide with a hydraulic cylinder device or the like, but may be a device that drives the slide via a toggle joint or the like. A proper driving method may be selected as appropriate in implementation.
[0029]
Further, the positioning pins provided so as to be able to project and retract on the surface of the table are not limited to those that are actively projected and retracted by the operating device, but are biased in a direction of projecting to the table surface by a coil spring or the like. Alternatively, it may be passively immersing with a large force of the upper mold that descends.
[0030]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the manufacturing efficiency of the joint member of the building unit which joins an upper and lower floor building unit firmly can be made favorable.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a framework of a building unit according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a joint portion of the upper and lower floor building units of the embodiment.
FIG. 3 is a perspective view showing the entire joint member of the embodiment.
FIG. 4 is a perspective view showing a main body part of the joint member of the embodiment before bending.
FIG. 5 is a perspective view showing a main part of the joint member according to the embodiment after bending.
FIG. 6 is a diagram showing a step in the manufacturing process of the embodiment.
FIG. 7 is a diagram showing a step subsequent to FIG. 6 in the manufacturing step.
FIG. 8 is a diagram showing a step subsequent to FIG. 7 in the manufacturing step.
FIG. 9 is a diagram showing a step subsequent to FIG. 8 in the manufacturing step.
FIG. 10 is a perspective view showing the entire manufacturing apparatus of the embodiment.
FIG. 11 is a plan view showing a main part of the manufacturing apparatus.
12 is a cross-sectional view taken along line XII-XII in FIG.
[Explanation of symbols]
1, 1A, 1B Building unit 2 Frame 3, 3A, 3B Column 4, 4A Upper beam 5, 5B Lower beam 6, 6A, 6B
12 Hole for both positioning hole and through hole
13 Hole as positioning hole
14 Bolt insertion hole as a through hole
21 Body parts as plate parts
22 Side parts as plate parts
23 Reinforcing parts as plate parts
24 Internal parts as plate parts
25 Rib parts as plate parts
28 Jig hole as a through hole
41 Upper mold
42 Lower mold
46 V-shaped groove
47 Protrusions that fit into V-shaped grooves
48 Extension
54 tables
66 to 68 Positioning pin

Claims (3)

A manufacturing method of a joint member of a building unit for manufacturing a box-shaped joint member that joins a column and a beam constituting a framework of the building unit ,
The joint member is composed of a plurality of plate-like parts including a body part, a side part, and an internal part,
Using a manufacturing apparatus having a table on which the plurality of plate-like components are placed, and a plurality of positioning pins provided so as to protrude and retract on the upper surface of the table,
A metal plate material corresponding to each of the main body part, the side part, and the internal part is formed by stamping, and a positioning hole or the building unit for determining the position of the building unit is formed in the metal plate material for the main body part. A plurality of through holes that can be used as bolt insertion holes for joining are provided,
After the first bending process is performed in a state where the positioning pin is inserted into at least one of the plurality of through holes and the metal plate material for the main body part is positioned, the other positioning holes are subjected to the other positioning. In a state where the pin is inserted and positioned, a second bending process is performed, and the main body part is formed in which three sides are opened by being folded into a U-shape,
After bending the metal plate material for the internal parts into an L-shape to form the internal parts ,
A method of manufacturing a joint member for a building unit , wherein one side of the body part is closed and the side part is welded, and two sides of the body part are closed and the internal part is welded. A building unit for manufacturing a joint member that is formed into a box shape including a main body part that is opened in three sides by bending a metal plate material into a U-shape, and is used for joining a column and a beam constituting the framework of the building unit a manufacturing apparatus of the Joint members,
A table for placing the metal sheet, a plurality of positioning pins provided can project and retreat into the table top has a pair of upper and lower molds for bending the metal plate, the under ones of these The mold is provided with a V-shaped groove corresponding to the bending angle of the main body part, and the upper mold is provided with a protrusion whose tip fits into the groove of the lower mold ,
At least two of the three surfaces of the main body component in the metal plate material for the main body component are each provided with at least one through hole, and at least two of these through holes are located at the position of the building unit. It is used as a positioning hole for determining the bolt and a bolt insertion hole for joining the building unit,
By inserting one of the plurality of positioning pins into a through-hole provided on one of the two surfaces of the main body component, the metal plate material for the main body component is set to the first bending position. By positioning and inserting another positioning pin into the through hole provided on the other of the two surfaces of the main body component, the metal plate material for the main body component can be positioned at the second bending position. An apparatus for manufacturing a joint member of a building unit, characterized in that it is configured . In the manufacturing apparatus of the joint member of the building unit of Claim 2 ,
The upper die is provided so as to be movable in the vertical direction, and has an extending portion extending in the moving direction, and the extending portion has a middle portion bent, and the joint member of the building unit is characterized in that Manufacturing equipment.

Images