Building unit manufacturing line and manufacturing method

Abstract

To provide the production line of a building unit reduced in labor of fitting a second outer wall at construction site mainly, on an opposite face of a long side of the building unit.SOLUTION: In a production line 21 of building units 2, 3, an outer wall part fitting device 23 is provided for fitting an outer wall part 7 on one side of a conveyor (main conveyer 22) conveying a unit frame 4 serving as skeletons of the building units 2, 3, and the outer wall part fitting device 23 is not provided on an opposite side of the conveyor (main conveyor 22). An article hanging device 26 is provided for moving the outer wall part 7 to the opposite side of the conveyor from the outer wall part fitting device 23 of one side of the conveyor (main conveyor 22).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a manufacturing line and method for building units. [Background technology]

[0002] Among buildings such as houses, there are unit buildings constructed using the unit construction method (see, for example, Patent Document 1). Unit buildings are buildings that can be constructed in a short period of time by transporting rectangular parallelepiped building units manufactured in advance in a factory to a construction site and assembling them at the construction site. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-79427 A Summary of the Invention [Problem to be solved by the invention]

[0004] When building units are manufactured in a factory, exterior wall sections are attached to the building units at positions that correspond to the attachment positions of the exterior walls relative to the unit building. However, for example, when it is necessary to attach exterior wall sections to both of a pair of opposing side surfaces of a building unit, until now, due to the configuration of the building unit manufacturing line and the convenience of manufacturing operations on the manufacturing line, the exterior wall section has been attached to only one of the pair of opposing side surfaces of the unit frame.

[0005] The opposite side of the unit frame is left without an exterior wall attached at the factory, and the exterior wall is attached at the construction site after the building unit is installed on the foundation. As a result, attaching the exterior wall to the opposite side of the unit frame at the construction site takes time and effort.

[0006] Therefore, a main object of the present invention is to contribute to improving the above-mentioned problems. [Means for solving the problem]

[0007] In response to the above problems, the present invention provides: A manufacturing line for building units, comprising: a conveyor for transporting unit frames that form the framework of the building units; a position for attaching a first outer wall portion to one side of the unit frame; and a working aisle on the opposite side of the conveyor; A lifting device is provided for moving a second outer wall portion from the position where the first outer wall portion is attached on one side of the conveyor to the work passage on the opposite side of the conveyor, and for attaching the second outer wall portion to the opposite side of the unit frame. 、 The lifting equipment is capable of attaching the first outer wall portion to one side surface of the unit frame at the position where the first outer wall portion is attached. It is characterized by the fact that [Effects of the Invention]

[0008] According to the present invention, by using the above-mentioned configuration, a lifting device is provided for moving the second outer wall portion from one side of the conveyor to the working passage on the other side, and the lifting device The first outer wall portion is attached to one side surface of the unit frame, and the second outer wall portion is attached to the opposite side surface of the unit frame. Installing the second outer wall Tarris By using the device as a mounting device, it is possible to reduce the time and effort required to attach a second exterior wall section to the opposite side of the building unit at the construction site. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a unit building using the building unit according to this embodiment. [Figure 2] FIG. 2 is a plan view of the unit building of FIG. 1. [Figure 3] FIG. 1 is a perspective view of a unit frame that forms the framework of a building unit. [Figure 4] FIG. 1 is a schematic perspective view showing a manufacturing line for building units. [Figure 5]FIG. 3 is an enlarged plan view of the periphery of a second exterior wall portion of the building unit of FIG. 2. [Figure 6] 10A and 10B are side views showing how a second exterior wall section is attached to a building unit, in which (a) shows the state before the second exterior wall section is attached and (b) shows the state after the second exterior wall section is attached. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, this embodiment will be described in detail with reference to the drawings. 1 to 6 are used to explain this embodiment. [Example]

[0011] <Configuration> The configuration of this embodiment will now be described.

[0012] As shown in Figure 1 (Figure 2), a building such as a house is a unit building 1 constructed using the unit construction method. The unit building 1 is a building that can be constructed in a short period of time by transporting building units 2 and 3 manufactured in advance in a factory to a construction site and assembling them at the construction site.

[0013] Here, the unit building 1 may have any configuration, but in this embodiment, the unit building 1 is configured by placing two building units 2 and 3 side by side. Below, a unit building 1 with this configuration will be described as an example, but the configuration of the unit building 1 is not limited to this.

[0014] The building units 2 and 3 are generally rectangular parallelepipeds. The building units 2 and 3 are available in both steel-frame and wood-frame constructions. As shown in Figure 3, the steel-frame building units 2 and 3 have a unit frame 4 with a box-frame rigid frame structure, in which four ceiling beams 4b are connected between the upper ends of four columns 4a in a rectangular shape in plan view, and four floor beams 4c are connected between the lower ends of the four columns 4a in a rectangular shape in plan view.

[0015] Here, the pillar 4a is made of, for example, a square cylindrical steel material extending in the vertical direction 5.

[0016] The ceiling beams 4b are made of, for example, C-shaped steel sections extending horizontally. The four ceiling beams 4b form a ceiling frame in the unit frame 4 that is substantially rectangular in plan view and that forms the ceiling surface.

[0017] The floor beams 4c are formed, for example, by shaped steel beams with a C-shaped cross section extending horizontally. The four floor beams 4c form a floor frame in the unit frame 4 that is substantially rectangular in plan view and that forms the floor surface.

[0018] As described above, the unit frame 4 is a rectangular parallelepiped three-dimensional frame that is made up of columns 4a, ceiling beams 4b, and floor beams 4c and serves as the framework for the building units 2 and 3. The rectangular parallelepiped unit frame 4 has four side surfaces 6 between the ceiling surface and the floor surface. In this embodiment, the four side surfaces 6 are referred to as first to fourth side surfaces 6(a) to 6(d). Each of the four side surfaces 6(a) to 6(d) is formed by an adjacent pair of columns 4a and the ceiling beams 4b and floor beams 4c above and below the pair of columns 4a.

[0019] As shown in Figure 2, for example, an exterior wall portion 7 is attached appropriately to the side surface 6 of the unit frame 4 that constitutes the building unit 2 at a position corresponding to the attachment position of the exterior wall of the unit building 1. In addition, a corner exterior wall 8 is attached to the corner portion of the unit frame 4. Although not explained further, the exterior wall portion 7 and corner exterior wall 8 are also attached appropriately to the side surface 6 of the building unit 3 at a position corresponding to the attachment position of the exterior wall of the unit building 1. The exterior wall portion 7 is a member that constitutes the exterior wall of the unit building 1 and is attached to all or part of each side surface 6 of the building units 2, 3.

[0020] In addition to the basic configuration described above, this embodiment can have the following configuration.

[0021] (1) As shown in FIG. 2, in the rectangular parallelepiped unit frame 4, A first outer wall portion 11 is attached to one (for example, at least one of the sides 6(a) and 6(c)) of a pair of opposing side surfaces 6 (side surfaces 6(a), 6(b) or side surfaces 6(c), 6(d)), and a second outer wall portion 12 is attached to the opposite side surface 6 (for example, at least one of the sides 6(b), 6(d)). In this case, the pair of side surfaces 6(a), 6(b) to which the first outer wall portion 11 and the second outer wall portion 12 are attached are the side surfaces 6(a), 6(b) on the long sides of the unit frame 4.

[0022] Here, the building units 2 and 3 may be either the building unit 2 or the building unit 3, but the example of the building unit 2 will be explained.

[0023] The unit frame 4 that constitutes the building unit 2 has two pairs of opposing side surfaces 6: side surfaces 6(a) and 6(b) on the long sides, and side surfaces 6(c) and 6(d) on the short sides. Of these, the side surfaces 6(a) and 6(b) on the long sides are larger surfaces that run along the longitudinal direction (beam direction) of the unit frame 4. The side surfaces 6(c) and 6(d) on the short sides are smaller surfaces that run along the lateral direction (gable direction) of the unit frame 4.

[0024] The first exterior wall portion 11 is an exterior wall portion 7 attached to one side surface 6(a) (hereinafter simply referred to as one side surface 6(a) or one side surface 6(a)) on the long side of the two pairs of opposing side surfaces 6(a), 6(b) and side surfaces 6(c), 6(d) of the unit frame 4 in the exterior wall of the unit building 1. The first exterior wall portion 11 is usually attached to the entire long side surface 6(a).

[0025] In this case, the first exterior wall portion 11 may be formed as a single exterior wall panel having a size that covers the entire surface of one of the long side surfaces 6(a) and attached to one of the long side surfaces 6(a) at once, or multiple exterior wall panels formed smaller than one of the long side surfaces 6(a) may be attached in a row so that they cover the entire surface of one of the long side surfaces 6(a). However, the first exterior wall portion 11 may also be attached locally to an area (part) smaller than one of the long side surfaces 6(a). The exterior wall panel is a panel that is formed by combining exterior wall materials and is used to form the exterior wall portion 7 (such as the first exterior wall portion 11 and the second exterior wall portion 12).

[0026] The second exterior wall section 12 is an exterior wall section 7 attached to the side surface 6(b) (hereinafter simply referred to as the opposite side surface 6(b)) on the long side opposite to the side surface 6(a) on the long side to which the first exterior wall section 11 is attached, out of two pairs of opposing side surfaces 6(a), 6(b) and side surfaces 6(c), 6(d) of the unit frame 4 in the exterior wall of the unit building 1. The second exterior wall section 12 is attached locally to the entire surface or at least a portion of the side surface 6(b) on the opposite long side. The second exterior wall section 12 is composed of exterior wall panels substantially similar to those of the first exterior wall section 11.

[0027] The long side surfaces 6(a) and 6(b) to which the first outer wall portion 11 and the second outer wall portion 12 are attached may be reversed.

[0028] The outer wall portion 7 may or may not be attached to one or both of the short side surfaces 6(c) and 6(d) of the unit frame 4 at the factory.

[0029] In the unit building 1, the attachment position of the exterior wall portion 7 relative to the building units 2, 3 (the unit frames 4 thereof) is determined depending on the position of the building units 2, 3 to be placed in the unit building 1.

[0030] Incidentally, in the case of a normal unit building 1, the unit building 1 is rarely made up of only a single building unit 2 or building unit 3, and the unit building 1 is often made up of a combination of multiple building units 2, 3. For this reason, the exterior wall section 7 is often attached to one of the side surfaces 6 (for example, side surface 6(a)) of each building unit 2, 3 (its unit frame 4) or to another side surface 6 perpendicular to the one side surface 6(a) (for example, at least one of the sides 6(c) and 6(d)) (one to three sides). However, in the case of this embodiment, the exterior wall section 7 is ultimately attached to all four side surfaces 6(a) to 6(d) of the building unit 2 (four sides).

[0031] 4 shows an example of a manufacturing line 21 in a factory for the building units 2 and 3. The manufacturing line 21 for the building units 2 and 3 will be described below. The manufacturing line 21 has a main conveyor 22 that moves the unit frames 4, and on one side (the rear side) of the main conveyor 22, there are installed exterior wall assembly equipment that assembles the exterior wall sections 7, and exterior wall mounting equipment 23 that mounts the exterior wall sections 7 assembled by the exterior wall assembly equipment to the unit frames 4.

[0032] The main conveyor 22 generally transports the unit frames 4 with their long sides parallel to the transport direction 24 of the main conveyor 22. As a result, the long side surfaces 6(a) and 6(b) of the unit frames 4 face both sides (the rear and front sides) of the transport direction 24 of the main conveyor 22. Furthermore, the short side surfaces 6(c) and 6(d) of the unit frames 4 face the upstream and downstream sides of the transport direction 24 of the main conveyor 22. By transporting the unit frames 4 in this orientation, the width of the main conveyor 22 can be kept small, allowing for efficient use of factory space. Furthermore, it becomes easy to manufacture various unit frames 4 with different long side lengths.

[0033] Workers enter and exit the unit frame 4 above the main conveyor 22 from a work passage 25 provided along the main conveyor 22 on the opposite side (front side) of the main conveyor 22 from the exterior wall mounting equipment 23, and perform assembly work inside and outside the unit frame 4. In addition, other equipment such as interior fitting equipment is also installed as appropriate on the front side of the main conveyor 22.

[0034] Since the production line 21 is configured as described above, it is preferable that of the pair of opposing side surfaces 6(a), 6(b) on the long sides of the unit frame 4, the side surface 6(a) to which the first outer wall section 11 is attached faces the rear side of the main conveyor 22, where the outer wall attaching equipment 23 is located. This makes it possible to assemble the first outer wall section 11 in the outer wall assembly equipment located on the rear side of the main conveyor 22, and then attach the assembled first outer wall section 11 directly to the side surface 6(a) facing the rear side of the main conveyor 22 by the rear outer wall attaching equipment 23, resulting in a rational equipment configuration. The opposite side surface 6(b) facing the front side of the main conveyor 22, where the outer wall attaching equipment 23 is not located, is the surface to which the second outer wall section 12 should be attached.

[0035] However, in the configuration of the production line 21 as described above, no dedicated exterior wall assembly equipment for assembling the second exterior wall portion 12 or dedicated exterior wall mounting equipment for mounting the second exterior wall portion 12 is provided on the front side of the main conveyor 22, making it difficult (in terms of equipment) to mount the second exterior wall portion 12 on the opposite side surface 6(b) of the unit frame 4. In other words, the existing production line 21 does not have an equipment configuration that assumes mounting the second exterior wall portion 12 on the opposite side surface 6(b) of the unit frame 4.

[0036] If the second outer wall portion 12 were to be attached to the opposite side surface 6(b) of the unit frame 4 in a factory, the first outer wall portion 11 and the second outer wall portion 12 would block both of the pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4, thereby eliminating space for workers to enter and exit from the work passage 25, thereby reducing workability. Therefore, it is considered undesirable to attach the first outer wall portion 11 and the second outer wall portion 12 to both of the pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4.

[0037] Therefore, due to the configuration of the manufacturing line 21 as described above and the convenience of manufacturing operations, it has not been possible to attach the outer wall portion 7 to both of the pair of opposing side surfaces 6(a), 6(b) of the unit frame 4 at the same time in the factory.

[0038] In contrast to this, in this embodiment, the second outer wall section 12 is manufactured in an outer wall assembly facility (mainly manufacturing the first outer wall section 11) located at the rear side of the main conveyor 22, and the manufactured second outer wall section 12 can be moved from the outer wall mounting facility 23 located at the rear side (mainly used to mount the first outer wall section 11) to the front side of the main conveyor 22 (in an empty space) using lifting equipment 26 such as a hoist (or mobile crane).This modifies the production line 21 so that the second outer wall section 12 can be mounted on the opposite side 6(b) of the unit frame 4 without having to install dedicated outer wall assembly or mounting facilities for the second outer wall section 12 at the front side of the main conveyor 22.

[0039] The lifting equipment 26 may be a general one, and may, for example, include a lifting part 26a for lifting and lowering the load, a guide part 26b for guiding the lifting part 26a from the rear side of the main conveyor 22 to the empty space on the front side, and a running part for moving the lifting part 26a laterally along the guide part 26b. Body andA plurality of lifting devices 26 can be installed in parallel and used simultaneously. This makes it possible to easily move even a large second outer wall portion 12 to the front side of the main conveyor 22 by using a plurality of lifting devices 26 simultaneously. For example, it also becomes possible to attach a large second outer wall portion 12 to the entire surface of the opposite side surface 6(b) in one go. In this embodiment, the two guide portions 26b are provided in a direction perpendicular to the main conveyor 22, with a length that exceeds the working passage 25 or more, and the travel Connecting the body together A connecting beam spanning two guide portions 26b 26c and I try to do this.

[0040] The lifting equipment 26 used to attach the second outer wall portion 12 to the opposite side surface 6(b) of the unit frame 4 may be newly installed, or an existing equipment installed in the factory for another purpose may be reused. When an existing equipment is reused, for example, a guide portion 26b may be added to guide the second outer wall portion 12 from the position of the outer wall attachment equipment 23 on the back side of the main conveyor 22 to the front side of the main conveyor 22.

[0041] In this way, simply by using a hoist or other lifting equipment 26 to move the second outer wall portion 12 from the rear side of the main conveyor 22 to the front side (of the open space), it is possible to expand the mounting patterns of the outer wall portion 7 to the unit frame 4 more than ever before. For example, depending on the situation, it may become possible to mount the outer wall portion 7 in a way that has not been possible before, such as not mounting the first outer wall portion 11 to one side surface 6(a) of the unit frame 4, but mounting the second outer wall portion 12 only to the opposite side surface 6(b) of the unit frame 4.

[0042] Furthermore, when attaching the exterior wall sections 7 to the short side surfaces 6(c), 6(d) of the unit frame 4 using a hoist or other lifting equipment 26, for example, the exterior wall sections 7 for the short side surfaces 6(c), 6(d) are manufactured in an exterior wall assembly equipment provided on the rear side of the main conveyor 22, and the manufactured exterior wall sections 7 are then carried from the rear exterior wall mounting equipment 23 to a position on the main conveyor 22 using a hoist (or mobile crane) or other lifting equipment 26, thereby enabling the exterior wall sections 7 to be attached to (at least one of) the short side surfaces 6(c), 6(d) of the unit frame 4 at a position on the main conveyor 22. In this embodiment, it is preferable to attach the exterior wall sections 7 to both short side surfaces 6(c), 6(d) in a factory.

[0043] (2) As shown in FIG. 2 (FIG. 5), the second outer wall portion 12 may be attached to a portion of the unit frame 4 that forms an inside corner portion 31.

[0044] Here, the second exterior wall portion 12 may be attached to the entire surface of the side surface 6(b) on the opposite side of the unit frame 4, but in this embodiment, it is attached to the inside corner portion 31. The inside corner portion 31 is a corner portion recessed inward that is formed on the outer surface of the unit building 1. For example, by installing two building units 2, 3 of different sizes side by side (in the short side direction), the inside corner portion 31 is formed between the protruding portion of the side surface 6(b) of the larger building unit 2 adjacent to the smaller building unit 3 on the long side, and the side surface 6(e) of the smaller building unit 3 that is perpendicular to the protruding portion.

[0045] Note that no exterior wall section 7 is installed in the overlapping portion of the long side surface 6(b) of the larger building unit 2 where it meets the smaller building unit 3. Therefore, the second exterior wall section 12 attached to the long side surface 6(b) of the larger building unit 2 is partial. In other words, the second exterior wall section 12 is a small exterior wall panel formed to the size of the surface that constitutes the recessed corner section 31, which is locally attached to the protruding portion of the side surface 6(b).

[0046] The second outer wall portion 12 is smaller than the overall size of the opposite side surface 6(b). As a result, even when the second outer wall portion 12 is attached to the opposite side surface 6(b) of the unit frame 4, the opposite side surface 6(b) is not completely blocked by the second outer wall portion 12, so space for workers to enter and exit from the opposite side surface 6(b) is secured. Therefore, for example, it is possible to attach the outer wall portions 7 to all four side surfaces 6 of the unit frame 4 in a factory.

[0047] (3) As shown in FIG. 6, a hanging hardware 41 may be attached to the second outer wall portion 12.

[0048] Here, the hanging hardware 41 is a metal fitting provided on the second exterior wall portion 12 to enable or facilitate hanging of the second exterior wall portion 12 by a general hanging equipment 26 such as a hoist. The hanging hardware 41 may be an eye plate or the like having a hole 41a for hanging or suspending directly from a hook provided on the lifting portion 26a of the hanging equipment 26, or indirectly via a suspending tool 45 such as a chain or a hoisting wire. The hanging hardware 41 is provided integrally with the second exterior wall portion 12 at the top (upper portion) of the back surface of the second exterior wall portion 12 so as to extend substantially perpendicular to the back surface of the second exterior wall portion 12.

[0049] In this embodiment, the hanging hardware 41 is provided on the upper side of the second outer wall portion 12, for example, at a position midway between the upper end and the center in the vertical direction 5. However, the installation position of the hanging hardware 41 is not limited to the above.

[0050] Hanging hardware 41 can be attached integrally, for example, by welding or bolting, to vertical structural members 46 attached to the back surface of second exterior wall portion 12. First exterior wall portion 11 and second exterior wall portion 12 can be exterior wall panels formed by integrally attaching exterior wall materials to a panel frame made up of vertical structural members 46 and horizontal structural members 47. Hanging hardware 41 is attached to at least vertical structural members 46 of the panel frame forming second exterior wall portion 12.

[0051] In FIG. 6, the second outer wall portion 12 has a height in the vertical direction 5 that extends between the ceiling beams 4b and the floor beams 4c of the unit frame 4.

[0052] (4) The second outer wall portion 12 may be provided with a hook portion 51 for the unit frame 4 .

[0053] Here, the hooking portion 51 is a locking fitting provided on the second exterior wall portion 12 in order to hook it onto the unit frame 4. The hooking portion 51 has a downward hook shape so that it can be hooked onto the unit frame 4 from above when the second exterior wall portion 12, which has been lifted by a lifting equipment 26 such as a hoist, is lowered. The hooking portion 51 is provided integrally with the second exterior wall portion 12 at the lower part (lower part) of the back surface of the second exterior wall portion 12 so as to extend approximately perpendicular to the back surface of the second exterior wall portion 12.

[0054] In this embodiment, the hook portion 51 is provided on the lower side of the second outer wall portion 12, for example, at a position slightly lower than the center in the up-down direction 5. However, the installation position of the hook portion 51 is not limited to the above.

[0055] The hook portion 51 can be attached integrally, for example, by welding or bolting, to the vertical structural member 46 attached to the back surface of the second outer wall portion 12. The hook portion 51 is, for example, a hook having a horizontal portion 51a extending toward the back surface side of the second outer wall portion 12 and a standing portion 51b extending downward from the tip of the horizontal portion 51a.

[0056] In contrast, the unit frame 4 is provided on its opposite side surface 6(b) with studs 55 (e.g., partition posts) for attaching the second exterior wall portion 12, and a receiving portion 56 for receiving the hook portion 51 is provided on the studs 55 (e.g., partition posts). The studs 55 are provided between the ceiling beams 4b and floor beams 4c of the unit frame 4, and the receiving portion 56 is provided at a position approximately the same height as the height of the hook portion 51 of the studs 55 when the second exterior wall portion 12 is attached. The receiving portion 56 is an engaging piece extending laterally from the side surface of the studs 55. The receiving portion 56 can be, for example, a screw attached to the side surface of the studs 55 so as to extend approximately horizontally along the surface direction of the opposite side surface 6(b) of the unit frame 4. To make it easier to receive the hook portion 51, the screw is preferably not completely driven into the side surface of the studs 55. The horizontal portion 51a of the hook portion 51 is placed on the receiving portion 56, and the rising portion 51b engages with the receiving portion 56 to prevent the second outer wall portion 12 from moving laterally, thereby preventing it from coming off.

[0057] The second outer wall portion 12 is ultimately fixed to the stud material 55 from the rear side (the inside of the unit frame 4) using rivets or the like. Therefore, the receiving portion 56 is not particularly used to fix the second outer wall portion 12.

[0058] After the outer wall portion 7 is attached, an inner wall panel 59 (FIG. 5) or the like is attached appropriately to the inside of the unit frame 4 as required.

[0059] <Operation> The operation of this embodiment will now be described.

[0060] When manufacturing a building unit 2 in a factory, the unit frame 4, which forms the skeleton of the building unit 2, is usually designed so that the outer wall portion 7 (first outer wall portion 11) is attached to only one (side surface 6(a)) of a pair of opposing side surfaces 6(a), 6(b) on the long side, due to reasons such as the configuration of the unit building 1, the configuration of the manufacturing line 21, and the convenience of manufacturing work.

[0061] Then, for the side surface 6(b) opposite the long side of the unit frame 4, the second exterior wall portion 12 is attached to the building unit 2 after the building units 2, 3 have been installed on the foundation at the construction site. Therefore, attaching the second exterior wall portion 12 to the side surface 6(b) opposite the long side of the building unit 2 at the construction site takes time and effort.

[0062] Therefore, in this embodiment, a first exterior wall portion 11 is attached to one of a pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4 of the building unit 2 at the factory (side surface 6(a)), and a second exterior wall portion 12 is attached to the opposite side surface 6(b).

[0063] <Effects> According to this embodiment, the following effects can be obtained.

[0064] (Effect 1) The first exterior wall section 11 is attached to one side 6(a) of the pair of opposing side surfaces 6(a), 6(b) of the unit frame 4, and the second exterior wall section 12 is attached to the opposite side surface 6(b) in advance at the factory. This reduces the effort required to attach the second exterior wall section 12 to the opposite side surface 6(b) of the building unit 2 (of the unit frame 4) at the construction site.

[0065] In this case, the first exterior wall portion 11 and the second exterior wall portion 12 may be attached to the long side surfaces 6(a), 6(b) of the unit frame 4. Due to the configuration of the manufacturing line 21 for the building units 2, the unit frames 4 are often transported by the main conveyor 22 with the long side surfaces 6(a), 6(b) facing both sides (the rear and front sides) of the conveying direction 24 of the main conveyor 22. Since exterior wall assembly equipment and exterior wall mounting equipment 23 are installed on the rear side of the main conveyor 22, the long side surface 6(a) facing the rear side of the main conveyor 22 is most suitable for mounting the first exterior wall portion 11. Therefore, the first exterior wall portion 11 is mounted in one go to the long side surface 6(a) facing the rear side using a large exterior wall mounting equipment 23.

[0066] In contrast, because the work passage 25 and other equipment are provided on the front side of the main conveyor 22, there is almost no room to provide large equipment such as the above-mentioned exterior wall mounting equipment 23 separately for the second exterior wall portion 12. Furthermore, the long side surface 6(b) facing the front side of the main conveyor 22 is one of the largest sides 6 of the unit frame 4, making it difficult to mount the second exterior wall portion 12 without large equipment such as the exterior wall mounting equipment 23. In other words, the long side surface 6(b) of the unit frame 4 is the most difficult surface to mount the second exterior wall portion 12 on.

[0067] Therefore, until now, the building unit 2 has been manufactured with the long side 6(b) of the unit frame 4, which is in front of the main conveyor 22, left open with no second outer wall portion 12 attached.

[0068] Therefore, by attaching the second outer wall portion 12 to the long side surface 6(b) of the unit frame 4 (which is in front of the main conveyor 22), which was previously difficult to attach due to the configuration of the manufacturing line 21 and the convenience of the manufacturing work, it is possible to obtain a building unit 2 with an unprecedented configuration, which has the first outer wall portion 11 and the second outer wall portion 12 on both of the long side surfaces 6(a), 6(b). This makes it possible to finish the building unit 2 to a higher level of completion at the factory stage.

[0069] Furthermore, the second outer wall portion 12 can be attached to the long side surface 6(b) of the unit frame 4, which is the front side of the main conveyor 22, by simply making a minor modification to the production line 21, such as adding a lifting device 26 for moving the second outer wall portion 12 from the rear side of the main conveyor 22, where the outer wall attachment device 23 is installed, to the front side of the main conveyor 22.

[0070] Furthermore, if both the first outer wall portion 11 and the second outer wall portion 12 are attached to a pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4, there is a risk that it will not be possible to secure space for workers to enter and exit the unit frame 4 on the production line 21. In this case, however, it is possible to use, for example, one of another pair of perpendicular side surfaces 6 (side surfaces 6(c), 6(d) on the short side) as space for workers to enter and exit.

[0071] (Effect 2) The second exterior wall portion 12 may be attached to the side surface 6(b) of the unit frame 4 opposite to the side on which the first exterior wall portion 11 is attached, at a location that forms the recessed corner portion 31 of the unit building 1.

[0072] In the unit building 1, for example, when the unit frames 4 of two building units 2, 3 of different sizes are installed side by side, the recessed corner 31 is formed between the protruding portion from the smaller building unit 3 on the opposite side 6(b) of the larger building unit 2 and the side 6(e) of the smaller building unit 3 that is perpendicular to the protruding portion.

[0073] Therefore, the second outer wall portion 12 is attached to the side surface 6(b) on the opposite side of the larger building unit 2 at a location that forms the inside corner portion 31.

[0074] This makes it possible to manufacture and ship the building unit 2 in a factory with the second exterior wall portion 12 already attached to the portion that will become the inside corner portion 31 of the unit building 1, thereby reducing the effort required to attach the second exterior wall portion 12 to the portion that will form the inside corner portion 31 at the construction site and install the exterior wall of the inside corner portion 31.

[0075] Furthermore, since the second outer wall portion 12 that forms the inside corner portion 31 is locally attached to the opposite side surface 6(b) of the unit frame 4, when the building unit 2 is manufactured in a factory, the second outer wall portion 12 does not block the entire side surface 6(b) of the building unit 2 on the opposite side of the unit frame 4, so even when the second outer wall portion 12 is attached, it is possible to ensure space for workers to enter and exit the opposite side surface 6(b) of the unit frame 4.

[0076] (Effect 3) Hanging hardware 41 may be attached to the second exterior wall portion 12. By using the hanging hardware 41, the second exterior wall portion 12 can be easily moved within the factory. For example, even in the case of a manufacturing line 21 for building units 2 as described above, that is, in which an exterior wall mounting facility 23 for mounting a first exterior wall portion 11 to one side surface 6(a) facing the rear of the unit frame 4 on the main conveyor 22 is provided at the rear side of the main conveyor 22, but no dedicated exterior wall mounting facility is provided at the front side of the main conveyor 22 for mounting a second exterior wall portion 12 to the opposite side surface 6(b) of the unit frame 4, by attaching a hanging hardware 41 to the second exterior wall portion 12, it is possible to easily lift the second exterior wall portion 12 using the hanging hardware 41, move the second exterior wall portion 12 to an empty space on the front side of the main conveyor 22, or the like, and mount the second exterior wall portion 12 to the opposite side surface 6(b) of the unit frame 4 in the empty space.

[0077] Furthermore, by attaching the hanging hardware 41 to the second exterior wall portion 12, it becomes possible to use (repurpose) general lifting equipment 26, such as a hoist installed in a factory, as a device for attaching the second exterior wall portion 12, making it possible to attach the second exterior wall portion 12 to the opposite side surface 6(b) of the unit frame 4 without significantly changing the configuration of the manufacturing line 21 for the building unit 2 described above.

[0078] In addition, by using the hanging hardware 41 to enable the second outer wall portion 12 to be lifted by the lifting equipment 26, the heavy physical work required by workers to raise and lower the second outer wall portion 12 and move it to the other side of the main conveyor 22 can be reduced.

[0079] (Effect 4) The second outer wall portion 12 may be provided with a hook portion 51 for the unit frame 4. This allows the second outer wall portion 12 to be hooked onto the unit frame 4 using the hook portion 51. This makes it possible to hold at least a portion of the second outer wall portion 12 by engaging with the opposite side surface 6(b) of the unit frame 4. Therefore, by hooking the second outer wall portion 12 onto the unit frame 4 using the hook portion 51, at least a portion of the second outer wall portion 12 is held by the unit frame 4, stabilizing the position and posture of the second outer wall portion 12. Furthermore, the unit frame 4 bears at least a portion of the weight of the second outer wall portion 12, facilitating the work of attaching the second outer wall portion 12 to the unit frame 4.

[0080] In addition, by hooking the second outer wall portion 12 onto the unit frame 4, it is possible to prevent the second outer wall portion 12 from falling when the second outer wall portion 12 is being installed, thereby improving the safety of the work.

[0081] Furthermore, by hooking the second outer wall portion 12 onto the unit frame 4, the second outer wall portion 12 is positioned in the vertical direction 5 and horizontal direction, thereby eliminating the need for height adjustment when attaching the second outer wall portion 12 to the unit frame 4. [Explanation of symbols]

[0082] 1 unit building 2 Building Units 4 Unit Frame 7 Exterior wall 11 First outer wall 12 Second outer wall 21 production lines 22 Main conveyor (conveyor) 23 Exterior wall mounting equipment 26 Lifting equipment 26a Lifting part 26b Guide part 26c Running body 41 Hanging hardware 51 Hook

Claims

1. A manufacturing line for building units, comprising: a conveyor for transporting unit frames that form the framework of the building units; a position for attaching a first outer wall portion to one side of the unit frame; and a working aisle on the opposite side of the conveyor; a lifting device is provided that moves a second outer wall portion from the position where the first outer wall portion is attached on one side of the conveyor to the work passage on the opposite side of the conveyor, and attaches the second outer wall portion to a side surface on the opposite side of the unit frame; A building unit manufacturing line characterized in that the lifting equipment is capable of attaching the first exterior wall portion to one side of the unit frame at the position where the first exterior wall portion is to be attached.

2. 2. A manufacturing line for building units according to claim 1, comprising: The lifting equipment is A lifting unit that raises and lowers the second outer wall portion; a guide portion that guides the lifting portion from the position on one side of the conveyor to the working passage on the other side; a running body that moves the lifting portion laterally along the guide portion in a direction perpendicular to the conveyor.

3. 3. A manufacturing line for building units according to claim 2, comprising: The lifting equipment has a plurality of guide sections and a plurality of running bodies, and a connecting beam that spans between the plurality of guide sections and can move laterally along the guide sections, and the plurality of running bodies are connected together by the connecting beam, forming a building unit manufacturing line.

4. A manufacturing line for building units according to any one of claims 1 to 3, A building unit manufacturing line characterized in that the lifting equipment has a hook for lifting the second exterior wall portion using a lifting hardware attached at an upper position halfway between the upper end of the second exterior wall portion and the center in the vertical direction.

5. The unit frames that form the framework of the building units are transported by conveyor. The first outer wall portion is attached to one side surface of the unit frame using a lifting device at a position where the first outer wall portion is attached, the position being provided on one side of the conveyor; Using the lifting equipment, a second outer wall portion is moved from the position where the first outer wall portion is attached on one side of the conveyor to a working passage provided on the opposite side of the conveyor; A method for manufacturing a building unit, characterized in that the second exterior wall portion is attached to the opposite side surface of the unit frame.

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