Installation method of building unit in rainy weather

Abstract

To make it possible to make a building unit waterproof with an existing protective cover, without using a waterproof sheet specifically designed for rainy weather.SOLUTION: In an installation method of a building unit 3 in rainy weather, a protective cover 11 for a shipping package is put on the building unit 3 from above, and the building unit 3 is transported to a construction site 4 in a state of covering the entire building unit 3 except for a bottom surface 12. At the construction site 4, the building unit 3 is installed in a state of being covered with the protective cover 11. Then, in a state that the protective cover 11 covers the building unit 3, a side portion 18a that overlaps with an adjacent building unit 3(B) is turned up. At this time, the turned-up side portion 18a of the protective cover 11 may be made to overlap the adjacent building unit 3(B) at a position between the upper portions thereof. The protective cover 11 for a shipping package uses a poly film 31 having a thickness of less than 0.1 mm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for rain installation of a building unit. [Background technology]

[0002] Some buildings, such as houses, are composed of unit buildings. 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, where they are assembled and installed (see, for example, Patent Document 1).

[0003] In such modular buildings, it is necessary to waterproof the interior of the building units to prevent rainwater from entering them from the time the building units are shipped from the factory and transported to the construction site, until the building units are installed at the construction site and the exterior of the building is completed.

[0004] For this reason, in Patent Document 1, for example, when it rains, the building unit is shipped with a rainproof sheet of a size and shape sufficient to cover the entire top and side surfaces of the building unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 5-17003 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above patent document, when it rains, the building unit is covered with a rainproof sheet that is large and shaped to cover the entire top and sides of the building unit before being transported, but the waterproof sheet used is a rain cover that is specially made for rainy weather. Therefore, the production of the rainproof sheet is costly. In addition, the rainproof sheet is thick enough that it takes time and effort to attach and detach it from the building unit, making it difficult to handle.

[0007] Therefore, a main object of the present invention is to contribute to improving the above-mentioned problems. [Means for solving the problem]

[0008] In response to the above problems, the present invention provides: a protective cover for shipping packaging is placed over the building unit to cover the entire building unit except for the bottom surface thereof, and the building unit is transported to a construction site; At the construction site, the building unit is installed with the protective cover still on, The method for installing the building unit in rainy weather is characterized in that the protective cover is left in a state of covering the building unit and the side portion that overlaps with the adjacent building unit is turned up. Effect of the Invention

[0009] With the above-described configuration, the present invention makes it possible to waterproof a building unit using an existing protective cover, without using a waterproof sheet specifically for rainy weather. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a shipping packing state of a building unit according to an embodiment of the present invention from a factory. [Diagram 2] FIG. 2 is a diagram showing work in a waiting area in the case of FIG. 1. [Diagram 3] FIG. 3 is a diagram showing the work carried out on the building unit immediately after transportation from the waiting area to the construction site in the case of FIG. 2; [Figure 4A]This is a diagram showing work on foundations at a construction site, in which (a) shows the foundation sheet in a mountain shape and (b) shows the foundation sheet in a flat state. [Figure 4B] FIG. 13 shows the inside of the foundation for forming the base sheet into a mountain shape. [Figure 5A] A diagram showing installation work on the lower floor. [Figure 5B] FIG. 5B is a diagram showing the lower floor installation work following FIG. 5A. [Figure 5C] FIG. 13 is a view showing the state in which the side portion of the protective cover covering the side surface of the building unit is turned up. [Figure 5D] FIG. 13 shows the state in which the side portions of the protective covers covering the sides of the adjacent building units are turned up. [Figure 5E] FIG. 13 shows the side portion of the protective cover that has been turned up and wrapped at a position between the tops of the adjacent building units. [Figure 5F] A diagram showing the completed installation of the lower floor building unit. [Figure 6] FIG. [Figure 7] A diagram showing installation work on the upper floor. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 13 is a diagram showing a factory shipping packing of a building unit according to a modified example of the present embodiment. [Figure 11] FIG. 11 is a diagram showing work in a waiting area in the case of FIG. 10. [Figure 12] FIG. 12 is a diagram showing the work performed during transportation from the waiting area to the construction site in the case of FIG. 11. [Figure 13] FIG. 13 is a diagram showing a factory shipping packing of a building unit according to a comparative example. [Figure 14] FIG. 14 is a diagram showing work in a waiting area in the case of FIG. 13. [Figure 15] FIG. 15 is a diagram showing the operations performed during transportation from the waiting area to the construction site in the case of FIG. 14. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] This embodiment will be described in detail with reference to FIGS. EXAMPLES

[0012] <Configuration> This embodiment has the following configuration.

[0013] A building 1 (Fig. 9) such as a house is composed of unit buildings. A unit building is a building 1 that can be constructed in a short period of time by transporting roughly rectangular parallelepiped building units 3 manufactured in advance in a factory 2 to a construction site 4 (Fig. 3) and assembling and installing them at the construction site 4. The building unit 3 has a strong unit frame with a box rigid frame structure inside as the skeleton, in which the upper ends of four columns are connected in a rectangular shape by four ceiling beams, and the lower ends of the four columns are connected in a rectangular shape by four floor beams.

[0014] In such a modular building, waterproofing is performed to prevent rainwater 5 (Figure 4A) from entering the interior of the building unit 3 from the time the building unit 3 is shipped from the factory 2 and transported to the construction site 4, until the building unit 3 is installed at the construction site 4 and the exterior shape of the building 1 is completed.

[0015] Once manufactured in the factory 2, the building units 3 are temporarily stored in a waiting area 6 (Fig. 2), and on the day of construction, they are transported from the waiting area 6 to the construction site 4. The building units 3 transported to the construction site 4 are installed on foundations 7 (Fig. 4A) that have been prepared in advance on the grounds of the construction site 4.

[0016] At this time, the building unit 3, as described below, A. Shipping packaging from Factory 2 (Fig. 1) B. Working in waiting area 6 (Fig. 2); C. Work on the building unit 3 immediately after transportation from the waiting area 6 to the construction site 4 (Figure 3); D. Work on the foundation 7 at the building site 4 (Figures 4A and 4B); E. Installation work on the lower floor (Fig. 5A to Fig. 5F), F. Lower floor and upper floor work (Fig. 6); G. Upper floor installation work (Fig. 7), H. Working upstairs (Fig. 8); I. Roof work (Fig. 9) It is designated as Building 1 after going through the above conditions and processes.

[0017] In contrast to the above, this embodiment may have the following configuration.

[0018] (1) The rain installation method for the building unit 3 is as follows: As shown in Figure 1, a protective cover 11 for shipping packaging is placed over the building unit 3, covering almost the entire building unit 3 except for the bottom surface 12, and then the building unit 3 is transported to the construction site 4, as shown in Figures 2 and 3. Then, at the construction site 4, as shown in Figs. 5A to 9, the building units 3 are installed with the protective covers 11 still in place.

[0019] Here, the rainy weather installation method is a method for installing the building unit 3 at the construction site 4 in rainy weather without getting the inside of the building unit 3 wet.

[0020] As shown in Fig. 1, the building unit 3 has a top surface 13 and a bottom surface 12 that are substantially rectangular in plan view, and four substantially rectangular side surfaces 14 that surround the top surface 13 and the bottom surface 12. The top surface 13 and the bottom surface 12 of the building unit 3 are made non-waterproof. The side surface 14 facing the outdoors is made waterproof by having an exterior wall 15 attached to it. The side surface 14 facing the indoors is made non-waterproof by having an opening (indoor opening surface 16) or the like. Therefore, at least the top surface 13 and the side surface 14 facing the indoors (indoor opening surface 16) need to be waterproofed (temporarily rainproofed) in case of rain.

[0021] The protective cover 11 for shipping packaging is a product protection material that is removably placed on the building unit 3 to protect the building unit 3 as a product, and is an existing product. The protective cover 11 is made of packaging film, and is placed on the building unit 3 so as to cover almost the entire building unit 3, at least in rainy weather. The protective cover 11 may also be placed on the building unit 3 in fine weather. In this embodiment, the protective cover 11 is kept attached almost continuously from the time of shipping from the factory 2 to the time of installation at the construction site 4.

[0022] The protective cover 11 is a three-dimensional object having a size and shape (approximately rectangular parallelepiped) sufficient to cover the entire exterior shape of the building unit 3. The protective cover 11 integrally has a top surface portion 17 that covers the top of the top surface 13 of the building unit 3, and four side surface portions 18 that cover the outside of the four side surfaces 14, and has an opening at the bottom surface. The protective cover 11 is placed on the building unit 3 from above through the opening at the bottom surface portion. When the protective cover 11 is placed on the building unit 3, the top surface portion 17 covers the top surface 13 of the building unit 3, the side surface portions 18 cover the side surfaces 14 of the building unit 3, and the lower parts of the side surface portions 18 almost reach the bottom surface 12 of the building unit 3.

[0023] A bottom surface 12 of the building unit 3 becomes the floor surface of the building unit 3 and is not covered by the protective cover 11. A top surface 13 of the building unit 3 becomes the ceiling surface. The four side surfaces 14 of the building unit 3 are vertical surfaces of the building unit 3, and depending on the plan and arrangement of the unit building, exterior walls 15 may be attached or these may become indoor opening surfaces 16.

[0024] The construction site 4 is a place where the building 1 is constructed, and is a place away from the factory 2 and the waiting area 6. The waiting area 6 is set in a position between the factory 2 and the construction site 4 and close to the construction site 4.

[0025] (2) In the above-mentioned method for installing the building unit 3 in rainy weather, the protective cover 11 may be left covering the building unit 3, as shown in Figures 5C and 5D, while the side portion 18a that overlaps with the adjacent building unit 3 (B) may be turned up.

[0026] Here, the adjacent building unit 3(B) is a building unit 3 that is installed next to the previously installed building unit 3(A). Note that the previously installed building unit 3(A) and the adjacent building unit 3(B) are relative to each other when three or more building units 3 are arranged adjacent to each other.

[0027] The side portion 18a overlapping with the adjacent building unit 3(B) becomes the side portion 18 of the protective cover 11 that covers the side surface 14 (indoor opening surface 16) facing the indoor side of the building unit 3. The building unit 3 may have one or more side portions 18a overlapping with the adjacent building unit 3(B).

[0028] The building unit 3 is installed so that the indoor opening surface 16 faces the opposing indoor opening surface 16 of the adjacent building unit 3 (B), so the overlapping side surface portion 18a is turned over when the adjacent building unit 3 (B) is installed (FIG. 5C). This makes it difficult for the indoor opening surface 16 of the building unit 3 to get wet in the rain.

[0029] In this case, when one (for example, side portion 18a) of the four side portions 18 of the protective cover 11 placed over the building unit 3 is turned over, at least a portion of the side portion 18 adjacent to the turned-over side portion 18 is also turned over. However, if the adjacent side portion 18 covers the side 14 that is waterproofed by the exterior wall 15 of the building unit 3, even if it is turned over, the interior of the building unit 3 will not get wet from rain because of the presence of the exterior wall 15. Therefore, there is no problem in turning over all four side portions 18 of the protective cover 11 at approximately the same time, as long as measures are taken to prevent the indoor opening surface 16 from getting wet.

[0030] If necessary, the protective cover 11 may be separated between the side portion 18a covering the indoor opening surface 16 and the adjacent side portion 18 covering the exterior wall 15 when the protective cover 11 is turned over. This prevents the adjacent side portion 18 from being turned over even when the side portion 18a is turned over.

[0031] In addition, for the adjacent building unit 3(B), the side portion 18a of the protective cover 11 that overlaps with the previously installed building unit 3(A) is turned up in the same manner as above (FIG. 5D). This makes it difficult for the indoor opening surface 16 of the adjacent building unit 3(B) to get wet in the rain.

[0032] The timing for turning over the overlapping side portions 18a of the protective covers 11 of the previously installed building unit 3 (A) and the adjacent building unit 3 (B) is preferably after each building unit 3 has been hoisted at the construction site 4. Also, the timing for turning over the side portions 18a is preferably before finishing installing the adjacent building unit 3 (B) on the foundation 7. In particular, the best timing for preventing rainwater from getting on the units is to turn over the units almost simultaneously just before installing the adjacent building units 3 (B) on the foundation 7. However, the timing for turning over the overlapping side portions 18a of the protective covers 11 is not limited to the above.

[0033] (3) In the rainy weather installation method of the building unit 3, As shown in FIG. 5E, the turned-up side portion 18a of the protective cover 11 may be overlapped at a position between the upper portions of the adjacent building units 3(B) (overlap portion 21).

[0034] Here, the turned-up side portion 18a of the protective cover 11 may be left on the top surface 13 of the building unit 3, or may be spread out toward the adjacent building unit 3(B). The turned-up side portion 18a of the adjacent building unit 3(B) may be left on the top surface 13, or may be spread out toward the previously installed building unit 3(A). By at least one of these methods, the two protective covers 11 overlap with the turned-up side portions 18a covering the space between the upper portions of the building units 3, forming a lap portion 21.

[0035] The upper-to-top location is a structural mating gap formed between the top surface 13 of the previously installed building unit 3(A) and the adjacent building unit 3(B).

[0036] The wrapping is performed by overlapping the turned-up side portion 18a with another protective cover 11 to prevent leakage of rainwater 5. The wrapping work is performed before or after the installation of the adjacent building unit 3(B) is completed.

[0037] (4) In the rainy weather installation method of the building unit 3, The protective cover 11 for shipping packaging may be a poly film 31 with a thickness of less than 0.1 mm.

[0038] Here, the poly film 31 is a thin resin material similar to that generally used for packaging films for products. The poly film 31 used for the protective cover 11 for shipping packaging is intended primarily for packaging purposes, and is not particularly designed for waterproofing (temporary rainproofing) in rainy weather. However, the protective cover 11 for shipping packaging is waterproof because it is made of the poly film 31. And, since the protective cover 11 for shipping packaging is extremely thin, less than 0.1 mm thick, it remains lightweight even when the quantity is large. Therefore, the protective cover 11 formed for shipping packaging is used for the building unit 3 instead of a waterproof sheet 32 ​​(rain cover) for rainy weather as shown in FIG. 13.

[0039] The protective cover 11 for shipping packaging is, for example, a transparent or semi-transparent poly film 31 having a thickness of about 0.011 mm to 0.09 mm. The protective cover 11 may be thinner within the above range, having a thickness of 0.03 mm to 0.06 mm, for example, 0.02 mm. The protective cover 11 may be slightly thicker within the above range, having a thickness of 0.06 mm to 0.09 mm, for example, 0.08 mm.

[0040] In contrast, the waterproof sheet 32 ​​(rain cover) for use only in rainy weather is often made of almost the same material as the construction work sheet used as a protective sheet or material cover at construction sites, and is often made to the same thickness as the work sheet. Such construction work sheets are made of almost the same material and thickness as the multi-purpose sheet called blue sheet for general use. Therefore, the waterproof sheet 32 ​​(rain cover) for use only in rainy weather has a thickness of, for example, 0.1 mm or more and a few millimeters or less. The waterproof sheet 32 ​​(rain cover) for use only in rainy weather is not intended for shipping packaging, and is therefore used together with the protective cover 11 for shipping packaging.

[0041] Comparing the two, the rainproof sheet 32 ​​(rain cover) for rainy weather only is made of a thin and durable material, but is relatively thicker than the protective cover 11 for shipping packaging, and so the larger it is, the more difficult it is to handle. On the other hand, the protective cover 11 for shipping packaging is incomparably thinner, so even if it is made larger, it is not as difficult to handle as the waterproof sheet 32 ​​(rain cover) for rainy weather only. In other words, the protective cover 11 for shipping packaging is easier to handle than the waterproof sheet 32 ​​(rain cover) for rainy weather only, and can be a more effective waterproofing member.

[0042] In addition, since the protective cover 11 for packaging is extremely thin, it may be possible to prevent it from coming off due to being blown off by the wind during transportation. For example, the protective cover 11 for packaging may be attached and fixed to the building unit 3 with tape. Also, for example, as shown in the modified examples of Figs. 10 to 12, the protective cover 11 for packaging may be covered and held down with a net 33 (Fig. 11). As shown in Fig. 12, the net 33 is removed before installation at the construction site 4. When the net 33 is used, the protective cover 11 for packaging may be a little thick, for example, 0.06 mm to 0.09 mm thick, particularly 0.08 mm thick, so as not to be damaged by the net 33.

[0043] <Function> The function of this embodiment is as follows.

[0044] Below, we will explain the steps and processes from manufacturing the building unit 3 in the factory 2 to transporting it to the construction site 4 and turning it into a building 1 at the construction site 4.

[0045] A. Shipping packaging from Factory 2 (Fig. 1)

[0046] The building unit 3 manufactured in the factory 2 is covered with a protective cover 11 for shipping and packaging in consideration of workability in rainy weather, a ceiling bulkhead 41 is placed on the protective cover 11, and a ceiling cover 42 and a unit cover 43 are then placed in that order.

[0047] Here, the ceiling bulkhead 41 is an existing removable auxiliary member for leveling the top surface 13 of the building unit 3 and reinforcing the top surface 13 so that workers can stand on it.

[0048] The ceiling cover 42 is an existing removable cover member for protecting the top surface 13 and the upper parts of the side surfaces 14 of the building units 3 during storage and transportation. The ceiling cover 42 is placed over the top surface 13 of the building units 3 at least when they are shipped from the factory 2.

[0049] The unit cover 43 is an existing removable cover member for protecting the entire building unit 3 during storage or transportation. The unit cover 43 is placed over the building unit 3 so as to cover the entire building unit 3 at least at the time of shipment from the factory 2.

[0050] Incidentally, currently, in the case of normal shipping, taking into consideration workability on fine weather, a ceiling bulking material 41 is placed on top of the building unit 3 manufactured in the factory 2, and a protective cover 11 for shipping packaging is placed on top of that, as shown in FIG. 10. That is, the order of the ceiling bulking material 41 and the protective cover 11 is likely to be reversed from that in this embodiment. However, even in the case of normal shipping, it is not uncommon for the ceiling bulking material 41 to be placed on top of the protective cover 11. Also, in this embodiment, it is possible to install the ceiling bulking material 41 under the protective cover 11. A ceiling cover 42 and a unit cover 43 are placed on top of the protective cover 11, in that order.

[0051] As a comparative example, when a rainproof sheet 32 ​​(rain cover) for rainy weather is used, a ceiling bulking material 41a for rainy weather is integrally attached on the building unit 3 manufactured in the factory 2 as shown in FIG. 13. Then, the building unit 3 having the ceiling bulking material 41a for rainy weather is covered with the rainproof sheet 32 ​​(rain cover). A protective cover 11 for shipping and packaging is placed on the rainproof sheet 32, and a unit cover 43 is placed on the protective cover 11. The rainproof sheet 32 ​​for rainy weather is provided separately in a ceiling waterproof cover 32a and a side waterproof cover 32b, and the ceiling waterproof cover 32a covers the upper surface 13 of the building unit 3, and the side waterproof cover 32b is attached so as to close the indoor opening surface 16 of the building unit 3. The ceiling waterproof cover 32a and the side waterproof cover 32b of this comparative example are different from those in Patent Document 1.

[0052] B. Work in waiting area 6 (Fig. 2)

[0053] The building units 3 packed for shipment from the factory 2 in FIG. 1 are loaded two onto a trailer 44 and transported simultaneously to the waiting area 6, as shown in FIG. 2, and then transferred one by one to each of the two trucks 45 at the waiting area 6.

[0054] In the case of the modified example of Fig. 10, two building units 3 packed for shipment from the factory 2 are loaded onto a trailer 44 as shown in Fig. 11 and transported simultaneously to the waiting area 6. At the waiting area 6, the unit cover 43, ceiling cover 42, and ceiling bulkhead 41 are removed from the building units 3, leaving only the protective cover 11 for packaging for shipment, and the building units 3 are transferred one by one onto two trucks 45. After that, a net 33 is placed over each building unit 3 from above the protective cover 11. The net 33 is fixed to the truck 45.

[0055] In the comparative example of FIG. 13, the building units 3 packed for shipment from the factory 2 are individually loaded onto one truck 45 and transported to the waiting area 6 as shown in FIG.

[0056] C. Work on the building unit 3 immediately after transportation from the holding area 6 to the construction site 4 (Figure 3)

[0057] The building units 3 transported individually from the waiting area 6 to the construction site 4 by truck 45 have the unit covers 43, ceiling covers 42, and ceiling bulkheads 41 removed, leaving only the protective covers 11 for shipping packaging covered. Then, with the protective covers 11 for shipping packaging still covered, the building units 3 are lifted up by a crane via the hoisting wires 46.

[0058] In the case of the modification of Fig. 11, the building units 3 covered with the net 33 are individually transported from the waiting area 6 to the construction site 4 by truck 45, and as shown in Fig. 12, the net 33 is removed at the construction site 4, leaving only the protective cover 11 for shipping packaging. Then, with the building units 3 covered with the protective cover 11 for shipping packaging, they are hoisted by a crane via a hoisting wire 46. At the construction site 4, it is only necessary to remove the net 33, which makes for good workability.

[0059] In the comparative example of Figures 13 and 14, the building units 3 are transported individually from the waiting area 6 to the construction site 4 by truck 45 in their shipping packing form with the special rainproof sheet 32 ​​attached at the factory 2. As shown in Figure 15, the unit cover 43 and the protective cover 11 for shipping packaging are removed from the building units 3 at the construction site 4, and the special rainproof sheet 32 ​​(ceiling waterproof cover 32a, side waterproof cover 32b) is attached to the building units 3. Then, with the special rainproof sheet 32 ​​attached, the building units 3 are hoisted by a crane via a hoisting wire 46. Since the protective cover 11 for shipping packaging is removed at the construction site 4, the protective cover 11 is not used for waterproofing during installation.

[0060] Then, the following work is performed at the construction site 4. Note that the same work is performed in the modified example of Fig. 10 to Fig. 12. Also, in the comparative example of Fig. 13 to Fig. 15, a different work is performed using a waterproof sheet 32 ​​designed specifically for rainy weather, so the explanation is omitted.

[0061] D. Work on foundation 7 at building site 4 (Figure 4A)

[0062] At the construction site 4, after the foundation 7 is poured, the entire upper surface 13 of the foundation 7 is covered in advance with a large foundation waterproof sheet 47. The foundation waterproof sheet 47 may be made of a relatively thick material similar to the waterproof sheet 32 ​​(rain cover) for rainy weather. The foundation waterproof sheet 47 may be made of a large single sheet, or may be made by joining multiple sheets together to make a large sheet.

[0063] At this time, as shown in Fig. 4B, a stepladder 48 may be set up at approximately the center of the interior of the foundation 7, and the approximately center portion of the foundation waterproof sheet 47 may be lifted up by the stepladder 48. This causes the foundation waterproof sheet 47 to have a mountain-like shape (Fig. 4A(a)), and prevents rainwater 5 from accumulating on the foundation waterproof sheet 47 (inside the foundation 7).

[0064] Then, on the day of installation of the building unit 3, the stepladders 48 are removed from inside the foundation 7 and the foundation waterproof sheet 47 is laid flat (FIG. 4A(b)).

[0065] E. Installation work on lower floor (Fig. 5A)

[0066] When the building units 3 arrive at the construction site 4 and are lifted (by a crane) (Figure 3), the building units 3 of the lower floor are installed on the foundation 7. The building units 3 of the lower floor are installed in the position of the foundation 7 where the foundation waterproof sheet 47 was turned over by flipping the flattened foundation waterproof sheet 47 from the foundation 7 by an amount equal to the size of the building unit 3 to be installed. The above is repeated in sequence as shown in Figure 5B, and the building units 3 are lined up on the foundation 7 until the state of Figure 5F is reached.

[0067] At this time, as shown in FIG. 5C, the protective cover 11 turns up the side portion 18a of the building unit 3(A) previously installed on the foundation 7, which overlaps with the adjacent building unit 3(B).

[0068] Similarly, as shown in FIG. 5D, the protective cover 11 of the adjacent building unit 3(B) has its side portion 18a, which overlaps with the building unit 3(A) previously installed on the foundation 7, turned up.

[0069] As a result, the building unit 3 (A) previously installed on the foundation 7 and the adjacent building unit 3 (B) are placed close together and directly facing each other with the indoor opening surfaces 16 not sandwiched between them by the side portion 18a of the protective cover 11.

[0070] Then, the side portion 18a of the protective cover 11 that is turned up in Figures 5C and 5D is wrapped at a position between the upper portion of the previously installed building unit 3(A) and the adjacent building unit 3(B) before and after installation of the adjacent building unit 3(B), as shown in Figure 5E (wrap portion 21).

[0071] F. Working on the lower floor (Fig. 6)

[0072] Once the installation of the lower floor building unit 3(L) on the foundation 7 is completed as described above, the foundation waterproof sheet 47 is removed from the foundation 7, and the removed foundation waterproof sheet 47 is moved onto the lower floor building unit 3(L). The foundation waterproof sheet 47 is then used as a tent to cover the entire top of the lower floor building unit 3(L), ​​and the protective cover 11 for shipping packaging is removed from the lower floor building unit 3(L) while waterproofing with the tent. Each part of the periphery of the tent is fixed to scaffolding or the like that has been constructed in advance around the foundation 7. The tent may also be shaped like a mountain using a stepladder 48 placed on the top surface 13 of the lower floor building unit 3(L).

[0073] G. Upper floor installation work (Fig. 7)

[0074] After removing the protective cover 11 for shipping packaging from the lower floor building unit 3(L), ​​the tent is turned over from above the lower floor building unit 3(L) by an amount equal to the size of the building unit 3 to be installed, and the upper floor building unit 3(H) is installed in the position where the tent is turned over. The above process is repeated in order, lining up the upper floor building units 3(H) on top of the lower floor building units 3(L).

[0075] At this time, if necessary, the protective cover 11 has a side portion 18a of the building unit 3(A) previously installed on the foundation 7 that overlaps with the adjacent building unit 3(B) turned up in the same manner as in FIG. 5C.

[0076] Similarly, the protective cover 11 of the adjacent building unit 3(B) has its side portion 18a overlapping with the building unit 3(A) previously installed on the foundation 7 turned up in the same manner as in FIG. 5D.

[0077] 5C and 5D, the side portion 18a of the protective cover 11 is turned up as in Fig. 5E. That is, the side portion 18a is wrapped (wrap portion 21) at a position between the upper portion of the previously installed building unit 3(A) and the adjacent building unit 3(B) before and after the installation of the adjacent building unit 3(B).

[0078] H. Working on upper floors (Fig. 8)

[0079] Once the installation of the upper floor building unit 3 on top of the lower floor building unit 3(L) is completed as described above, the tent is removed from the lower floor building unit 3(L) and then moved onto the upper floor building unit 3. The entire top of the upper floor building unit 3 is then covered with the tent to waterproof it, while the protective cover 11 for shipping packaging is removed from the upper floor building unit 3. Each part of the periphery of the tent is fixed to scaffolding or the like that has been constructed in advance around the foundation 7. The tent may also be shaped like a mountain using a stepladder 48 placed on the top surface 13 of the upper floor building unit 3(H).

[0080] If the building unit 3 is on the third floor or more, the above-mentioned G. upper floor installation work and H. upper floor installation work are repeated until the desired number of floors is reached.

[0081] I. Roof work (Fig. 9)

[0082] Finally, with the upper floor building unit 3 waterproofed with a tent, the roof 49 is installed and work is carried out on the eaves around the roof 49.

[0083] In this way, the building 1 is constructed while preventing the inside of the building unit 3 from getting wet in rainy weather.

[0084] <Effects> The effects of this embodiment are as follows.

[0085] (Effect 1) In the rain installation method for the building unit 3 of this embodiment, the existing protective cover 11 for shipping packaging is used to waterproof the building unit 3 when it is installed. This makes it possible to waterproof the building unit 3 without using a special rainproof sheet 32 ​​(rain cover), so the special rainproof sheet 32 ​​(rain cover) can be eliminated. This in turn reduces costs. Since the protective cover 11 for shipping packaging is a material that is already in use, there is no increase in costs. Also, by not using a special rainproof sheet 32 ​​(rain cover), the effort and time required to attach and remove the special rainproof sheet 32 ​​(rain cover) to and from the building unit 3 can be reduced.

[0086] The building unit 3 is entirely covered with a protective cover 11 for shipping and packaging from the time of shipment until at least immediately before installation at the construction site 4. Therefore, even in rainy weather, the protective cover 11 makes the inside of the building unit 3 waterproof so that it does not get wet.

[0087] If necessary, in order to prevent the protective cover 11 for shipping packaging from coming off during transportation, etc., a net 33 or the like may be placed over the building unit 3 over the protective cover 11. The net 33 is effective in holding down the protective cover 11, and since it is made of a coarse-meshed material, it is not very costly and does not require as much effort to put on and take off as a waterproof sheet 32 ​​(rain cover) designed specifically for rainy weather.

[0088] (Effect 2) In the above, the protective cover 11 may be left covering the building unit 3, with the side portion 18a overlapping with the adjacent building unit 3 (B) being turned up. In this way, by partially turning up the protective cover 11, the building unit 3 can be installed in a state where the protective cover 11 is almost still covering the building unit 3, without removing the entire building unit 3. This makes the installation work of the building unit 3 easy and can be completed in a short time.

[0089] Furthermore, until immediately before the adjacent building unit 3 (B) is installed, the side surface 14 (indoor opening surface 16) of the building unit 3, which is the opening of the building unit 3, can be covered with the side portion 18a of the protective cover 11, thereby preventing the indoor opening surface 16 from getting wet due to rain.

[0090] Furthermore, by partially turning up the side portion 18a of the protective cover 11, it is possible to prevent the protective cover 11 from getting caught between the adjacent building unit 3(B).

[0091] (Effect 3) In the above, the protective cover 11 placed over the building unit 3 may be turned up so that the side portion 18a is wrapped around the upper portion of the adjacent building unit 3 (B). This allows the wrapped portion of the protective cover 11 to prevent the space between the building units 3 from getting wet due to rain.

[0092] (Effect 4) In the above, the protective cover 11 for shipping and packaging may use a poly film 31 having a thickness of less than 0.1 mm. Since the protective cover 11 has a thickness of less than 0.1 mm, it is thinner and lighter than a waterproof sheet 32 ​​(rain cover) for use only in rainy weather. Therefore, the side portions 18a of the protective cover 11 can be easily turned up and the turned-up side portions 18a can be easily wrapped around each other to ensure waterproofing. Furthermore, since the protective cover 11 for shipping and packaging is much thinner and lighter than a waterproof sheet 32 ​​(rain cover) for use only in rainy weather, it is easier to handle and easier to remove from the building unit 3, and easier to fold, collect, and remove after removal. [Explanation of symbols]

[0093] 3 Building Units 4 Construction site 11 Protective cover 12 Bottom 18 Side part 18a Side part 21 Wrapping Section 31 Polyethylene film

Claims

1. a protective cover for shipping packaging is placed over the building unit to cover the entire building unit except for the bottom surface thereof, and the building unit is transported to a construction site; At the construction site, the building unit is installed while the protective cover is still on, A method for installing a building unit in rainy weather, comprising the steps of: flipping up a side portion of the protective cover that overlaps with an adjacent building unit while the protective cover is still placed over the building unit.

2. 2. A method for rain installation of a building unit according to claim 1, comprising the steps of: A method for installing a building unit in rain, characterized in that the side portion of the protective cover that is turned up is overlapped at a position between the upper portions of the adjacent building units.

3. A method for installing a building unit in rainy weather according to claim 1 or 2, comprising the steps of:

10. A method for installing a building unit in rainy weather, comprising the steps of: (a) providing a protective cover for shipping packaging; (b) using a poly film having a thickness of less than 0.1 mm;

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