JP7649111B2 - Building Unit Manufacturing System - Google Patents

Description

The present invention relates to a building unit manufacturing system .

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 that have been manufactured in advance in a factory to the construction site and assembling them there.

JP 2002-79427 A

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 sections have been attached to only one of the pair of opposing side surfaces of the unit frame.

The opposite side of the unit frame was left without the exterior wall attached at the factory, and the exterior wall was attached at the construction site after the building unit was installed on the foundation. This meant that attaching the exterior wall to the opposite side of the unit frame at the construction site was time-consuming and labor-intensive.

Therefore, the main objective of the present invention is to contribute to improving the above-mentioned problems.

In response to the above problems, the present invention provides:
A building unit manufacturing system for manufacturing a building unit by attaching an exterior wall section to a rectangular parallelepiped unit frame,
a conveyor that conveys the unit frame with its long side parallel to a conveying direction;
An exterior wall assembly facility provided on one side of the conveyor;
and a lifting facility for moving the exterior wall assembled by the exterior wall assembly facility to the other side of the conveyor .
A first exterior wall portion assembled by the exterior wall assembly equipment is attached to one side surface of the conveyor of the unit frame transported by the conveyor, and a second exterior wall portion assembled by the exterior wall assembly equipment is attached to the opposite side surface of the unit frame on the other side of the conveyor via the lifting equipment,
a pair of side surfaces to which the first outer wall portion and the second outer wall portion are attached are side surfaces on longer sides of the unit frame,
A hanging hardware for hanging by the lifting equipment is attached to the second outer wall portion at an upper position halfway between the upper end portion and the center portion in the vertical direction,
The second outer wall portion is provided with a hook portion at a lower position slightly lower than the center in the vertical direction, which hooks onto a receiving portion provided on the unit frame when the second outer wall portion lifted by the lifting equipment is lowered, and which engages and holds the second outer wall portion and positions the second outer wall portion in the vertical direction.
The second outer wall portion is attached to the opposite side surface of the unit frame with the hook portion hooked onto the receiving portion.

According to the present invention, with the above-mentioned configuration, the second exterior wall section assembled by the exterior wall assembly equipment can be attached to the opposite side of the unit frame on the other side of the conveyor via the lifting equipment, thereby reducing the effort required to attach the second exterior wall section to the opposite side of the long side of the building unit at the construction site.
In addition, a hanging hardware is attached to the upper position of the second outer wall portion, halfway between the upper end and the center in the vertical direction, making it easy to suspend and move the second outer wall portion using lifting equipment .
The second outer wall portion is provided with a hook portion at a lower position slightly lower than the vertical center, which hooks onto a receiving portion provided on the unit frame to engage and hold the second outer wall portion when the second outer wall portion is lowered after being lifted by a lifting equipment, and also positions the second outer wall portion in the vertical direction.By hooking the hook portion of the second outer wall portion onto the receiving portion of the unit frame, the position and posture of the second outer wall portion can be stabilized, and the second outer wall portion can be positioned and attached to the opposite side of the unit frame .

1 is a perspective view of a unit building using the building unit according to an embodiment of the present invention; FIG. 2 is a plan view of the unit building of FIG. 1. FIG. 2 is a perspective view of a unit frame that forms the skeleton of a building unit. FIG. 2 is a schematic perspective view showing a manufacturing line for building units. FIG. 3 is an enlarged plan view of the periphery of a second external wall portion of the building unit of FIG. 2; 1A and 1B are side views showing the state in which 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.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 6 are intended to explain this embodiment.

<Configuration> The configuration of this embodiment is explained below.

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 that have been manufactured in advance at a factory to a construction site and assembling them at the construction site.

The unit building 1 may have any configuration, but in this embodiment, the unit building 1 is configured by installing 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.

The building units 2 and 3 are generally rectangular parallelepipeds. There are steel-framed and wood-framed building units 2 and 3. Of these, the steel-framed building units 2 and 3 have a unit frame 4 with a box-frame rigid frame structure, as shown in FIG. 3, 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.

Here, the pillar 4a is, for example, made of a rectangular tubular steel material extending in the vertical direction 5.

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

The floor beams 4c are formed, for example, from steel sections with a C-shaped cross section extending horizontally. The four floor beams 4c form a floor frame in the unit frame 4 that is approximately rectangular in plan view and serves to form the floor surface.

As described above, the unit frame 4 is a rectangular parallelepiped three-dimensional frame that is the framework of the building units 2 and 3, and is composed of columns 4a, ceiling beams 4b, and floor beams 4c. 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 the first to fourth side surfaces 6(a) to 6(d). The four side surfaces 6(a) to 6(d) are each formed by a pair of adjacent columns 4a and the ceiling beams 4b and floor beams 4c above and below the pair of columns 4a.

As shown in FIG. 2, for example, an exterior wall portion 7 is appropriately attached to the side surface 6 of the unit frame 4 constituting 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, an exterior wall portion 7 and a corner exterior wall 8 are also appropriately attached 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 the entirety or part of each side surface 6 of the building units 2 and 3.

In addition to the basic configuration described above, this embodiment can have the following configuration:

(1) As shown in FIG. 2, in the unit frame 4 having a rectangular parallelepiped shape,
A first outer wall portion 11 is attached to one (e.g., at least one of the sides 6(a) and 6(b) or the sides 6(c) and 6(d)) of a pair of opposing side surfaces 6, and a second outer wall portion 12 is attached to the opposite side surface 6 (e.g., at least one of the sides 6(b) and 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 defined as the side surfaces 6 ( a ), 6 ( b ) on the longer sides of the unit frame 4 .

Here, building units 2 and 3 can be either building unit 2 or building unit 3, but we will explain using the example of building unit 2.

There are two pairs of opposing side surfaces 6 in the unit frame 4 that constitutes the building unit 2: 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 long side surfaces 6(a) and 6(b) are the larger surfaces that run along the longitudinal direction (beam direction) of the unit frame 4. The short side surfaces 6(c) and 6(d) are the smaller surfaces that run along the lateral direction (gable direction) of the unit frame 4.

The first exterior wall portion 11 is an exterior wall portion 7 attached to one of the long side surfaces 6(a) (hereinafter, simply referred to as one side surface 6(a) or one side surface 6(a)) 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 surface of one of the long side surfaces 6(a).

In this case, the first exterior wall portion 11 may be formed as a single exterior wall panel having a size covering the entire surface of one side surface 6(a) on the long side, for example, and may be attached to one side surface 6(a) on the long side at once, or multiple exterior wall panels formed smaller than one side surface 6(a) on the long side may be arranged and attached to cover the entire surface of one side surface 6(a) on the long side. However, the first exterior wall portion 11 may also be locally attached to an area (part) smaller than one side surface 6(a) on the long side. The exterior wall panel is a panel for constituting the exterior wall portion 7 (such as the first exterior wall portion 11 and the second exterior wall portion 12) formed by combining exterior wall materials.

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)) of the long side surface 6(a) on the opposite side surface to which the first exterior wall section 11 is attached, out 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 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 surface. The second exterior wall section 12 is composed of an exterior wall panel substantially similar to that of the first exterior wall section 11.

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.

The outer wall section 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.

In a unit building 1, the mounting position of the exterior wall portion 7 relative to the building units 2, 3 (their unit frames 4) is determined depending on where in the unit building 1 the building units 2, 3 are placed.

Incidentally, in the case of a normal unit building 1, the unit building 1 is rarely constructed from only a single building unit 2 or building unit 3, and the unit building 1 is often constructed by combining multiple building units 2, 3. Therefore, the exterior wall portion 7 is often attached to one of the side surfaces 6 (e.g., side surface 6(a)) of each building unit 2, 3 (the unit frame 4), or to another side surface 6 perpendicular to the one side surface 6(a) (e.g., at least one of sides 6(c) and 6(d)) (one to three sides). However, in the case of this embodiment, the exterior wall portion 7 is ultimately attached to all four sides 6(a) to 6(d) of the building unit 2 (four sides).

Figure 4 shows an example of a manufacturing line 21 for building units 2 and 3 in a factory. The manufacturing line 21 for 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.

The unit frames 4 are generally transported on the main conveyor 22 with their long sides parallel to the transport direction 24 of the main conveyor 22. As a result, the long side surfaces 6(a), 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. The short side surfaces 6(c), 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 dimension of the main conveyor 22 can be kept small, allowing for efficient use of space in the factory. Also, it becomes easy to manufacture various unit frames 4 with different long side lengths.

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 appropriately installed on the front side of the main conveyor 22.

Because the manufacturing line 21 is configured in this way, it is preferable that, of the pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4, the side surface 6(a) to which the first outer wall portion 11 is attached faces the rear side of the main conveyor 22 where the outer wall mounting equipment 23 is located. This allows the manufacturing line 21 to assemble the first outer wall portion 11 using the outer wall assembly equipment on the rear side of the main conveyor 22, and to directly mount the assembled first outer wall portion 11 to the side surface 6(a) facing the rear side of the main conveyor 22 using the rear outer wall mounting equipment 23, resulting in a rational equipment configuration. The opposite side surface 6(b) facing the front side of the main conveyor 22 where there is no outer wall mounting equipment 23 is the surface to which the second outer wall portion 12 should be attached.

However, in the configuration of the manufacturing line 21 as described above, there is 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 provided in front of the main conveyor 22, making it difficult (in terms of equipment) to mount the second exterior wall portion 12 on the opposite side 6(b) of the unit frame 4. In other words, the existing manufacturing line 21 does not have an equipment configuration that assumes mounting the second exterior wall portion 12 on the opposite side 6(b) of the unit frame 4.

If the second outer wall portion 12 were to be attached to the opposite side surface 6(b) of the unit frame 4 in the factory, both of the pair of opposing side surfaces 6(a), 6(b) on the long side of the unit frame 4 would be blocked by the first outer wall portion 11 and the second outer wall portion 12, and the space for workers to enter and exit from the work passage 25 would be lost, 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.

Therefore, due to the configuration of the manufacturing line 21 as described above and the convenience of the manufacturing process, the outer wall portion 7 has not been attached 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.

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

The lifting equipment 26 may be a general one, and may have, for example, 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 body 26c for moving the lifting part 26a laterally along the guide part 26b. A plurality of lifting equipment 26 can be installed in parallel and used simultaneously. This makes it possible to easily move even a large second outer wall part 12 to the front side of the main conveyor 22 by using a plurality of lifting equipment 26 simultaneously. It also makes it possible, for example, to attach a large second outer wall part 12 to the entire surface of the opposite side surface 6 (b) in one go. In this embodiment, two guide parts 26b are provided in a direction perpendicular to the main conveyor 22 with a length that exceeds the work passage 25 or more, and the running body 26c is connected to the two guide parts 26b by a connecting beam that spans between them.

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

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), the mounting patterns of the outer wall portion 7 on the unit frame 4 can be expanded 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 on one side 6(a) of the unit frame 4, and mounting the second outer wall portion 12 only on the opposite side 6(b) of the unit frame 4.

When the outer wall portion 7 is attached to the short side surfaces 6(c) and 6(d) of the unit frame 4 using a hoist or other lifting equipment 26, for example, the outer wall portion 7 for the short side surfaces 6(c) and 6(d) is manufactured in an outer wall assembly equipment provided at the rear side of the main conveyor 22, and the manufactured outer wall portion 7 is carried from the rear outer wall mounting equipment 23 to a position on the main conveyor 22 using a hoist (or mobile crane) or other lifting equipment 26, so that the outer wall portion 7 can be attached to the short side surfaces 6(c) and 6(d) (or at least one of them) of the unit frame 4 at the position on the main conveyor 22. In this embodiment, it is preferable to attach the outer wall portion 7 to both short side surfaces 6(c) and 6(d) at a factory.

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

Here, the second outer 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 that is recessed inward and formed in the outer portion 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 from the smaller building unit 3 on the side surface 6(b) of the larger building unit 2 on the long side adjacent to the smaller building unit 3, and the side surface 6(e) of the smaller building unit 3 that is perpendicular to the protruding portion.

The exterior wall section 7 is not installed on 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).

The second exterior wall portion 12 is smaller than the overall size of the opposite side surface 6(b). As a result, even if the second exterior 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 exterior 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 exterior wall portion 7 to all four sides 6 (four faces) of the unit frame 4 at the factory.

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

Here, the hanging hardware 41 is a metal fitting provided on the second exterior wall portion 12 so that the second exterior wall portion 12 can be hung by a general hanging equipment 26 such as a hoist, or to make it easier to hang. The hanging hardware 41 may be an eye plate having a hole 41a for hanging or suspending directly from a hook provided on the lifting part 26a of the hanging equipment 26, or indirectly via a hoist 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 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.

In this embodiment, the hanging hardware 41 is provided on the upper side of the second outer wall portion 12, for example, in a position halfway 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.

The hanging hardware 41 can be attached integrally to the vertical structural member 46 attached to the back surface of the second exterior wall portion 12, for example, by welding or bolting. The first exterior wall portion 11 and the second exterior wall portion 12 can be exterior wall panels formed by integrally attaching exterior wall materials to a panel frame body composed of vertical structural members 46 and horizontal structural members 47. The hanging hardware 41 is attached to the vertical structural members 46 of the panel frame body that forms at least the second exterior wall portion 12.

In FIG. 6, the second exterior wall portion 12 has a height extending between the ceiling beam 4b and the floor beam 4c of the unit frame 4 in the vertical direction 5.

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

Here, the hook portion 51 is a locking metal fitting provided on the second exterior wall portion 12 in order to hook it onto the unit frame 4. The hook 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 hook 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.

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.

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

In contrast, the unit frame 4 is provided with a stud material 55 (partition pillar, etc.) for mounting the second exterior wall portion 12 on the opposite side 6 (b), and a receiving portion 56 for receiving the hook portion 51 is provided on the stud material 55 (partition pillar, etc.). The stud material 55 is provided between the ceiling beam 4b and the floor beam 4c of the unit frame 4, and the receiving portion 56 is provided at a position at approximately the same height as the height of the hook portion 51 when the second exterior wall portion 12 of the stud material 55 is mounted. The receiving portion 56 is an engaged piece extending horizontally from the side of the stud material 55. The receiving portion 56 can be, for example, a screw attached to the side of the stud material 55 so as to extend approximately horizontally along the surface direction of the side surface 6 (b) on the opposite side of the unit frame 4. It is preferable that the screw is installed in a state where it is not completely driven into the side surface of the stud material 55 in order to make it easier to receive the hook portion 51. The horizontal portion 51a of the hook portion 51 is placed on the receiving portion 56, and the rising portion 51b engages the receiving portion 56 to prevent the second outer wall portion 12 from moving laterally, thereby preventing it from coming off.

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.

After the outer wall section 7 is installed, an inner wall panel 59 (Figure 5) or the like is installed inside the unit frame 4 as needed.

<Function> The function of this embodiment is explained below.

When the building unit 2 is manufactured in a factory, the unit frame 4 that 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 only to one (side surface 6(a)) of a pair of opposing side surfaces 6(a), 6(b) on the long side, due to the configuration of the unit building 1, the configuration of the manufacturing line 21, and the convenience of the manufacturing work.

The second exterior wall portion 12 is attached to the side surface 6(b) opposite the long side of the unit frame 4 after the building units 2 and 3 are installed on the foundation at the construction site. Therefore, it takes time and effort to attach 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.

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

<Effects> This embodiment provides the following effects:

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

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 frame 4 is often transported by the main conveyor 22 with the long side surfaces 6(a), 6(b) facing both sides (the rear side and the front side) of the transport direction 24 of the main conveyor 22. Since the exterior wall assembly equipment and the 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 the large exterior wall mounting equipment 23.

In contrast, because a 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 exterior wall mounting equipment 23 for the second exterior wall section 12. Furthermore, since 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, it is difficult to mount the second exterior wall section 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 section 12 on.

Therefore, up 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 and without the second exterior wall section 12 attached.

Therefore, by attaching the second outer wall portion 12 to the long side surface 6(b) of the unit frame 4 (the side 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 having a first outer wall portion 11 and a second outer wall portion 12 on both long side surfaces 6(a), 6(b). This makes it possible to finish the building unit 2 to a more complete state at the factory stage.

The second outer wall section 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 small modification to the production line 21, such as adding a lifting device 26 for moving the second outer wall section 12 from the rear side of the main conveyor 22, where the outer wall mounting device 23 is installed, to the front side of the main conveyor 22.

In addition, 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, for example, it is possible to use one of the other pair of perpendicular side surfaces 6 (side surfaces 6(c), 6(d) on the short side) as a space for workers to enter and exit.

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

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

Therefore, the second exterior wall portion 12 is attached to the portion of the larger building unit 2 that forms the recessed corner portion 31 on the opposite side surface 6(b).

This makes it possible to manufacture and ship the building unit 2 with the second exterior wall portion 12 already attached to the area that will become the inside corner portion 31 of the unit building 1 at the factory, thus reducing the effort required to install the exterior wall of the inside corner portion 31 by attaching the second exterior wall portion 12 to the area that will form the inside corner portion 31 at the construction site.

In addition, the second exterior wall portion 12 that forms the recessed corner portion 31 is locally attached to the opposite side surface 6(b) of the unit frame 4. This means that when the building unit 2 is manufactured in a factory, the entire side surface 6(b) of the unit frame 4 of the building unit 2 is not blocked by the second exterior wall portion 12. This makes it possible to ensure space for workers to enter and exit the opposite side surface 6(b) of the unit frame 4 even after the second exterior wall portion 12 is attached.

(Effect 3) A hanging hardware 41 may be attached to the second exterior wall portion 12. By using the hanging hardware 41, it becomes easier to move the second exterior wall portion 12 within the factory. For example, even in the case of a manufacturing line 21 for building units 2 as described above, that is, in the case where the rear side of the main conveyor 22 is provided with an exterior wall mounting device 23 for mounting the first exterior wall portion 11 to one side 6 (a) facing the rear side of the unit frame 4 on the main conveyor 22, but the front side of the main conveyor 22 is not provided with a dedicated exterior wall mounting device for mounting the second exterior wall portion 12 to the opposite side 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, and mount the second exterior wall portion 12 to the opposite side 6 (b) of the unit frame 4 in the empty space.

By attaching the hanging hardware 41 to the second exterior wall section 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 section 12, so it becomes possible to attach the second exterior wall section 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.

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

(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 to 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 side surface 6 (b) on the opposite side of the unit frame 4. Therefore, by hooking the second outer wall portion 12 to 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, and since the unit frame 4 bears at least a portion of the weight of the second outer wall portion 12, the work of attaching the second outer wall portion 12 to the unit frame 4 can be easily performed.

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

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, eliminating the need to adjust the height of the second outer wall portion 12 when attaching it to the unit frame 4.

REFERENCE SIGNS LIST 1 unit building 2 building unit 4 unit frame 4a pillar 4b ceiling beam 4c floor beam 6 side surface 6(a) long side surface 6(b) long side surface 11 first exterior wall portion 12 second exterior wall portion 31 recessed corner portion 41 hanging hardware 51 hook portion

Claims (2)

A building unit manufacturing system for manufacturing a building unit by attaching an exterior wall section to a rectangular parallelepiped unit frame,
a conveyor that conveys the unit frame with its long side parallel to a conveying direction;
An exterior wall assembly facility provided on one side of the conveyor;
and a lifting facility for moving the exterior wall assembled by the exterior wall assembly facility to the other side of the conveyor .
A first exterior wall portion assembled by the exterior wall assembly equipment is attached to one side surface of the conveyor of the unit frame transported by the conveyor, and a second exterior wall portion assembled by the exterior wall assembly equipment is attached to the opposite side surface of the unit frame on the other side of the conveyor via the lifting equipment,
a pair of side surfaces to which the first outer wall portion and the second outer wall portion are attached are side surfaces on longer sides of the unit frame,
A hanging hardware for hanging by the lifting equipment is attached to the second outer wall portion at an upper position halfway between the upper end portion and the center portion in the vertical direction,
The second outer wall portion is provided with a hook portion at a lower position slightly lower than the center in the vertical direction, which hooks onto a receiving portion provided on the unit frame when the second outer wall portion lifted by the lifting equipment is lowered, and which engages and holds the second outer wall portion and positions the second outer wall portion in the vertical direction.
A building unit manufacturing system according to claim 1, wherein the second exterior wall portion is attached to the opposite side surface of the unit frame with the hook portion hooked onto the receiving portion. 2. A building unit manufacturing system according to claim 1, comprising:
A building unit manufacturing system according to claim 1, wherein the second exterior wall portion is attached to a portion that forms an inside corner of the unit frame.