Rooftop waterproof structure

Abstract

To fix a new waterproof sheet with high fixing strength while suppressing falling of cutting dust into an indoor side when repairing to keep an indoor environment proper.SOLUTION: A roof waterproof structure 1 comprises: a first fixing steel plate 12 arranged between a board 11 and a roof substrate 10; a second fixing steel plate 13 arranged on the board 11; a fixing metal fitting 14 arranged on the second fixing steel plate 13; a first fastening material 23 fixing the fixing metal fitting 14 to the second fixing steel plate 13; and a waterproof sheet 15 fixed to the fixing metal fitting 14. The second fixing steel plate 13 is provided with a repair fixing portion 13c for fixing a repair fixing metal fitting 30 to which a repair waterproof sheet 31 that is different from the waterproof sheet 15 is fixed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rooftop waterproofing structure that can be renovated. [Background technology]

[0002] For example, the roofs of buildings such as various commercial facilities, factories, and warehouses are equipped with a metal roofing base such as a deck plate or folded plate, a board such as a wood-based cement board or insulating material laid on top of the metal roofing base, and a waterproof sheet laid on top of the board, with the waterproof sheet ensuring that the roof is waterproof (see, for example, Patent Documents 1 and 2).

[0003] FIG. 16 shows an example of a conventional rooftop waterproofing structure at the time of new construction. As shown in FIG. 16, a fixing bracket is arranged on the board, and this fixing bracket is fixed to the metal roof base together with the board by a fastening material. When the waterproof sheet is a polymer-based waterproof sheet, particularly a polyvinyl chloride resin sheet or a thermoplastic elastomer sheet, a fixing bracket made of a core material such as a steel plate coated with the same resin may be fixed to the corner of the building together with the board by a fastening material such as a screw or an anchor. By fusing and fixing the waterproof sheet to the fixing bracket with a solvent or by fusing and fixing with hot air, it is possible to prevent the waterproof sheet from floating up or breaking due to the movement of the waterproof sheet and the metal roof base due to aging, seasonal changes, and temperature differences between day and night. In particular, fixing the fixing bracket to the corner with a fastening material is effective from the viewpoint of wind resistance.

[0004] After a waterproof sheet is laid, its waterproofing may deteriorate over time. In this case, renovation work is carried out to lay a new waterproof sheet on top of the old one. Figure 17 shows an example of a conventional rooftop waterproof structure during renovation. As shown in this figure, renovation fixing brackets are placed on top of the old waterproof sheet, and these, together with the old fixing brackets and boards, are fixed to the metal roof substrate with renovation fasteners. A new waterproof sheet is then fixed to the renovation fixing brackets.

[0005] However, there is a problem in that, in the case of a building being a factory or warehouse, there is often no ceiling on the interior side of the metal roof. Therefore, as shown in Figure 17, when drilling holes in the existing metal roof foundation with the repair fixture, chips generated fall inside the building and may adversely affect the indoor environment, i.e., the machinery and equipment inside the building, the products being produced, and the workers.

[0006] Examples of renovation work that suppress such adverse effects include a method disclosed in Patent Document 3 in which a renovation fixing bracket is fastened to the fixing bracket to which the existing waterproof sheet is attached, and a new waterproof sheet is fixed to this renovation fixing bracket, and a method disclosed in Patent Document 4 in which an unwelded / fused portion of the waterproof sheet is provided in advance on a corner fixing bracket, and during renovation, the old waterproof sheet in that area is removed in a strip shape, exposing the unwelded / fused portion of the corner fixing bracket, and a new waterproof sheet is fixed to the exposed portion. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2018-31218 A [Patent Document 2] Japanese Patent Application Publication No. 9-302783 [Patent Document 3] JP 2011-80212 A [Patent Document 4] JP 2002-349018 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the renovation method of Patent Document 3, since the renovation fixing metal fittings are fastened to the existing fixing metal fittings, the above-mentioned problems caused by cutting chips do not occur, but the fixing strength of the renovation fixing metal fittings depends on the fixing strength of the fastening material of the existing fixing metal fittings to the metal roof substrate. In other words, since the existing fastening material is old, it is possible that the fixing strength of the existing fastening material has decreased over time. If the fixing strength of the existing fastening material has decreased, the fixing strength of the renovation fixing metal fittings will also decrease, and ultimately the fixing strength of the new waterproof sheet will also decrease.

[0009] In addition, the repair method of Patent Document 4 does not generate any cutting chips because it does not require the use of new fastening materials to fix the fixing metal fittings. However, the unfused and fused parts of the existing corner fixing metal fittings may have deteriorated over time, and if deterioration has progressed, the fixing strength of the new waterproof sheet will decrease.

[0010] In particular, when it comes to the corners of metal roofing underlayment, the waterproofing work carried out at the time of new construction often does not take into consideration the possibility of the next renovation.

[0011] The present invention has been made in consideration of these points, and its purpose is to make it possible to fix a new waterproof sheet with high fixing strength while preventing sawdust from falling indoors during renovation, thereby maintaining a good indoor environment. [Means for solving the problem]

[0012] In order to achieve the above object, a first aspect of the present disclosure can be a rooftop waterproof structure for a building. The rooftop waterproof structure includes a roof foundation, a board arranged on the roof foundation, a first fixing steel plate arranged between the board and the roof foundation and fixed to the roof foundation, a second fixing steel plate arranged on the board and fixed to the roof foundation, a fixing metal fitting arranged on the second fixing steel plate, a first fastening material that fixes the fixing metal fitting to at least the second fixing steel plate, and a waterproof sheet fixed to the fixing metal fitting. The second fixing steel plate is provided with a renovation fixing portion for fixing a renovation fixing metal fitting to which a renovation waterproof sheet different from the waterproof sheet is fixed.

[0013] According to this configuration, when newly installed, the first and second fixing steel plates are arranged to sandwich the board in the thickness direction, and both fixing steel plates are fixed to the roof foundation. The fixing metal fittings are fixed to at least the second fixing steel plate by the first fastening material, so that they are fixed to the roof foundation via the second fixing steel plate. Waterproofing can be ensured by the waterproof sheet fixed to the fixing metal fittings.

[0014] When the waterproof sheet deteriorates over the years since it was first installed, renovation work is carried out. For renovation work, at least a waterproof sheet for renovation and a fixing bracket for renovation are prepared. Since the fixing bracket for renovation can be fixed to at least the fixing part for renovation of the second fixing steel plate, there is no need to drill holes in the roof substrate, so that cutting chips do not fall inside the building and noise during renovation work can be reduced. Then, the renovation work is completed by fixing the waterproof sheet for renovation to the fixing bracket for renovation.

[0015] In a second aspect of the present disclosure, the first fastening material is screwed into the roof foundation, passing through the second fixing steel plate and the first fixing steel plate.

[0016] According to this configuration, the first fixing steel plate and the second fixing steel plate can be fixed to the roof foundation by the common first fastening material.

[0017] In a third aspect of the present disclosure, the first fastening material penetrates the fixing metal fitting.

[0018] According to this configuration, the fixing metal fittings can also be fixed to the roof foundation by the first fastening material that fixes the first fixing steel plate and the second fixing steel plate.

[0019] In a fourth aspect of the present disclosure, the second fixing steel plate is formed larger than the fixing bracket and is fixed to the roof substrate by more fastening points than the fastening points of the fixing bracket to the second fixing steel plate.

[0020] With this configuration, the second fixing steel plate is larger than the fixing bracket and there are many fastening points to the roof base, so the fixing strength of the renovation fixing bracket fixed to the second fixing steel plate is sufficiently ensured.

[0021] In a fifth aspect of the present disclosure, a second fastening material is provided that fastens the first fixing steel plate to the roof foundation.

[0022] According to this configuration, the first fixing steel plate can be fixed to the roof substrate by the first fastening material and the second fastening material, thereby increasing the fixing strength of the first fixing steel plate and, ultimately, the fixing strength of the second fixing steel plate.

[0023] In a sixth aspect of the present disclosure, the board includes a riser board that extends upward and is fixed to a roof component disposed above the roof foundation. The first fixing steel plate has a first riser plate portion that is disposed between the roof component and the riser board and fixed to the roof component, and the second fixing steel plate has a second riser plate portion that extends upward along the riser board and is fixed to the roof component. The repair fixing portion is provided on the second riser plate portion.

[0024] According to this configuration, it becomes possible to fix the second fixing steel plate to a roof component member separate from the roof foundation.

[0025] In a seventh aspect of the present disclosure, a rooftop waterproof structure having a roof substrate with a flat upper surface can be assumed. The rooftop waterproof structure includes a board disposed on the roof substrate, a fixing steel plate disposed on the board and fixed to the roof substrate, a fixing metal fitting disposed on the fixing steel plate, and a waterproof sheet fixed to the fixing metal fitting, and the fixing steel plate is provided with a renovation fixing portion for fixing a renovation fixing metal fitting to which a renovation waterproof sheet different from the waterproof sheet is fixed.

[0026] According to this configuration, during the repair work, the repair fixing metal fittings can be fixed to the repair fixing parts of the fixing steel plate, so that cutting chips do not fall inside the building. Then, the repair work is completed by fixing the repair waterproof sheet to the repair fixing metal fittings. Effect of the Invention

[0027] As described above, when renovation work is carried out many years after the new construction, the renovation waterproof sheet can be fixed with high fixing strength while preventing sawdust from falling indoors when fixing the renovation fixing fittings, thereby maintaining a good indoor environment. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view showing a partial cross section of a rooftop waterproofing structure according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a vertical cross-sectional view of a rooftop waterproofing structure according to a first embodiment of the present invention at the time of new installation. [Diagram 3] FIG. 2 is a view equivalent to FIG. 1 during repair according to the first embodiment of the present invention. [Figure 4] FIG. 3 is a view equivalent to FIG. 2 during repair according to the first embodiment of the present invention. [Diagram 5] FIG. 4 is a view corresponding to FIG. 2 according to a second embodiment of the present invention. [Figure 6] FIG. 5 is a view corresponding to FIG. 4 according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a view corresponding to FIG. 2 according to a third embodiment of the present invention. [Figure 8] FIG. 11 is a view corresponding to FIG. 2 according to a fourth embodiment of the present invention. [Figure 9] FIG. 5 is a view corresponding to FIG. 3 according to a modified example. [Figure 10] FIG. 11 is a view corresponding to FIG. 2 according to a fifth embodiment of the present invention. [Figure 11] FIG. 5 is a view corresponding to FIG. 4 according to a fifth embodiment of the present invention. [Figure 12] FIG. 11 is a view corresponding to FIG. 2 according to a sixth embodiment of the present invention. [Figure 13] FIG. 11 is a view corresponding to FIG. 4 according to a sixth embodiment of the present invention. [Figure 14] FIG. 11 is a view corresponding to FIG. 2 according to a seventh embodiment of the present invention. [Figure 15] FIG. 11 is a view corresponding to FIG. 4 according to a seventh embodiment of the present invention. [Figure 16] FIG. 1 is a cross-sectional view of a conventional rooftop waterproofing structure at the time of new construction. [Figure 17] FIG. 1 is a cross-sectional view of a conventional rooftop waterproofing structure during renovation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0030] (Embodiment 1) Fig. 1 shows a rooftop waterproof structure 1 according to a first embodiment of the present invention. The rooftop waterproof structure 1 is provided on the roof of buildings such as various commercial facilities, factories, warehouses, offices, etc., and the scale and size of the structure are not particularly limited. In the case of a factory, machinery and equipment may be in operation inside the building to manufacture various products, etc. In the case of a warehouse, luggage, etc. may be stored inside the building.

[0031] The rooftop waterproofing structure 1 forms a flat area 2, a rising area 3, and a recessed corner 4 on the roof of a building. The flat area 2 is a section that extends almost horizontally, but it is also possible to set a slight water gradient. The rising area 3 is a section that extends upward from the periphery of the flat area 2. The recessed corner 4 is a corner formed by the periphery of the flat area 2 and the lower part of the rising area 3.

[0032] The rooftop waterproof structure 1 includes a roof underlayment 10, a board 11, a first fixing steel plate 12, a second fixing steel plate 13, a fixing bracket 14, and a waterproof sheet 15. The roof underlayment 10 is a metal roof underlayment such as a deck plate, a flat deck, or a folded plate. The roof underlayment 10 is formed with a plurality of peaks 10a and a plurality of valleys 10b arranged alternately in a predetermined direction, and therefore the roof underlayment 10 is composed of an uneven roofing material. The tops of the peaks 10a of the roof underlayment 10 extend horizontally. In addition, the valleys 10b of the roof underlayment 10 are formed between the peaks 10a, and the bottoms of the valleys 10b also extend horizontally. No ceiling is installed on the indoor side of the roof underlayment 10. The shape and structure of the roof underlayment 10 are not limited to those shown in the figure, and may be, for example, a roof underlayment made of reinforced concrete (RC underlayment). In the case of RC base, the building may be a hospital or nursing facility.

[0033] The board 11 is, for example, a plate-shaped insulating material, and is disposed on the roof underlayment 10. The board 11 extends horizontally and includes a flat board 11a that constitutes the flat area portion 2, and a rising board 11b that extends upward from the peripheral portion of the flat board 11a and constitutes the rising portion 3. The flat board 11a is also fastened to the top of the peak portion 10a of the roof underlayment 10 with, for example, drill screws or tapping screws, etc., in a portion other than the recessed corner portion 4.

[0034] The board 11 may be made of a single foam such as polystyrene foam, polyurethane foam, polyisocyanurate foam, polyethylene foam, or phenol foam, or may be made of a multi-layered plate with a surface material provided on the surface of a foam. As the surface material, for example, waterproof paper, aluminum foil, aluminum vapor deposition paper, or a material with a thermoplastic elastomer such as a plastic film attached thereto can be used.

[0035] The board 11 may be a foam used in the heat insulating material, the surface of which is covered with a thin metal plate. The thickness of the metal plate may be, for example, 0.5 mm or less, but is not limited thereto. The board 11 may be a wood-based cement board. The wood-based cement board is a board made by compression molding using wood raw materials such as wood wool and wood chips as main raw materials and cement, as specified in JIS A 5404, for example. The board 11 may be used in a single layer, or multiple sheets may be used in a stack. The thickness of the board 11 may be, for example, 15 mm or more, but is not limited thereto.

[0036] The rooftop waterproof structure 1 includes a metal frame material (roof constituent member) 17 disposed above the roof foundation 10. The frame material 17 is formed so as to surround the flat area portion 2 in a plan view, and in this embodiment, it is provided on both the upper and lower sides. The upper and lower parts of the rising board 11b are fixed to the upper frame material 17 and the lower frame material 17, respectively. The rising board 11b can be fixed to the frame material 17 with, for example, drill screws or tapping screws. The rising board 11b may be fixed only with drill screws or tapping screws, but in order to prevent sinking, it can also be fixed using a disk-shaped metal or plastic member with an outer diameter of about 50 to 150 mm as a washer.

[0037] When the flat board 11a is laid and fixed on the roof substrate 10 at the time of new construction, the flat area portion 2 can be directly fixed to the peak portion 10a of the roof substrate 10 with drill screws, tapping screws, etc. However, if the valley portion 10b of the roof substrate 10 is located just below the recessed corner portion 4 where the flat area portion 2 and the rising portion 3 intersect, the flat board 11a cannot be fixed to the roof substrate 10 at the recessed corner portion 4. Therefore, as shown in FIG. 2, a first fixing steel plate 12 is installed in advance at the recessed corner portion 4. The first fixing steel plate 12 extends long along the recessed corner portion 4. A plurality of first fixing steel plates 12 can be arranged around the entire circumference so as to follow the peripheral portion of the flat area portion 2. This allows the flat board 11a to be fixed to the first fixing steel plate 12 even at the recessed corner portion 4.

[0038] The first fixing steel plate 12 has a first horizontal plate portion 12a extending horizontally and a first rising plate portion 12b extending upward from the outer edge of the first horizontal plate portion 12a. "Outside" refers to the outer side in the horizontal direction of the rooftop waterproofing structure 1, which is the left side in Fig. 2. "Inside" refers to the inner side in the horizontal direction of the rooftop waterproofing structure 1, which is the right side in Fig. 2.

[0039] The first horizontal plate portion 12a and the first rising plate portion 12b can be obtained by press-molding one steel plate. The angle between the first horizontal plate portion 12a and the first rising plate portion 12b is 90 degrees. The first fixing steel plate 12 is a member in which a rust-proofing process is applied to a steel plate, and the thickness can be in the range of 0.6 mm to 3.2 mm, or in the range of 0.8 mm to 1.2 mm. By setting the thickness of the first fixing steel plate 12 within the above-mentioned range, the workability during drilling is improved while securing the fixing strength, and further the workability on site is improved, and the cost can be reduced while keeping the weight of the first fixing steel plate 12 in the optimal range.

[0040] The first horizontal plate portion 12a of the first fixing steel plate 12 is disposed between the flat board 11a and the top of the peak portion 10a of the roof underlayment 10, and is a portion fixed to the top of the peak portion 10a of the roof underlayment 10. The first horizontal plate portion 12a extends along the top of the peak portion 10a of the roof underlayment 10. The first horizontal plate portion 12a may be fixed to the top of the peak portion 10a of the roof underlayment 10 by welding, for example, or may be fixed to the top of the peak portion 10a of the roof underlayment 10 by a plurality of horizontal plate portion fastening members 20. The horizontal plate portion fastening member 20 is a member corresponding to the second fastening member of the present invention, and is a member constituting the rooftop waterproof structure 1. The horizontal plate portion fastening member 20 is composed of a drill screw, a tapping screw, or the like, and is provided at intervals in the longitudinal direction of the first fixing steel plate 12. The interval between the horizontal plate portion fastening members 20 is called the pitch. With the first horizontal plate portion 12a placed on the top of the peak portion 10a of the roof underlayment 10, the horizontal plate portion fastening material 20 is screwed from above the first horizontal plate portion 12a into pilot holes formed in the first horizontal plate portion 12a and the top of the peak portion 10a of the roof underlayment 10, thereby fastening the first horizontal plate portion 12a to the top of the peak portion 10a of the roof underlayment 10. The fixing point of the first horizontal plate portion 12a to the roof underlayment 10 may be the center of the top of the peak portion 10a, or may be offset from the center in the width direction of the peak portion 10a.

[0041] The first rising plate portion 12b of the first fixing steel plate 12 is disposed between the lower frame material 17 and the rising board 11b, and is a portion fixed to the lower frame material 17. The first rising plate portion 12b extends along the lower frame material 17. The first rising plate portion 12b may be fixed to the frame material 17 by welding, for example, or may be fixed to the frame material 17 by a plurality of rising plate portion fastening members 21. The rising plate portion fastening members 21 are members that constitute the rooftop waterproof structure 1. The rising plate portion fastening members 21 are composed of drill screws, tapping screws, or the like, and are provided at intervals in the longitudinal direction of the first fixing steel plate 12. The interval between the rising plate portion fastening members 21 is called the pitch. With the first rising plate portion 12b positioned adjacent to the frame material 17, the first rising plate portion 12b can be fastened to the frame material 17 by screwing the rising plate portion fastening material 21 from the side of the first rising plate portion 12b into pilot holes formed in the first rising plate portion 12b and the frame material 17.

[0042] The second fixing steel plate 13 is fixed to the roof foundation 10 in a state of being disposed on the flat board 11a. The second fixing steel plate 13 extends long along the recessed corner portion 4, and a plurality of second fixing steel plates 13 can be disposed over the entire circumference along the peripheral portion of the flat area portion 2. In a plan view, the second fixing steel plate 13 is disposed in a range overlapping with the first horizontal plate portion 12a of the first fixing steel plate 12, and extends along the upper surface of the flat board 11a directly above the first horizontal plate portion 12a. The flat board 11a is sandwiched in the thickness direction by the first horizontal plate portion 12a of the first fixing steel plate 12 and the second fixing steel plate 13. The second fixing steel plate 13 is made of the same material as the first fixing steel plate 12 and has the same thickness as the first fixing steel plate 12. The first fixing steel plate 12 and the second fixing steel plate 13 may have different thicknesses.

[0043] The second fixing steel plate 13 is fixed to the top of the peak 10a of the roof underlayment 10 by a plurality of flat-site fastening members 22. The flat-site fastening members 22 are composed of drill screws, tapping screws, etc., and are provided at intervals in the longitudinal direction of the second fixing steel plate 13. The interval between the flat-site fastening members 22 is called the pitch. That is, the flat-site fastening members 22 are formed so as to penetrate the second fixing steel plate 13 and the flat board 11a and reach the top of the peak 10a of the roof underlayment 10. The flat-site fastening members 22 are screwed into pilot holes formed at the top of the peak 10a of the roof underlayment 10, thereby allowing the second fixing steel plate 13 and the flat board 11a to be fixed to the top of the peak 10a of the roof underlayment 10.

[0044] The flat site fastening material 22 also penetrates the first horizontal plate portion 12a of the first fixing steel plate 12 together with the second fixing steel plate 13 and the flat board 11a. The flat site fastening material 22 can also be screwed into a pilot hole formed in the first horizontal plate portion 12a. Therefore, the first horizontal plate portion 12a of the first fixing steel plate 12 is fixed to the top of the peak portion 10a of the roof foundation 10 by the flat site fastening material 22.

[0045] The fixing bracket 14 is disposed on the second fixing steel plate 13. Specifically, the lower surface of the fixing bracket 14 overlaps the upper surface of the second fixing steel plate 13. The fixing bracket 14 extends long in the longitudinal direction of the second fixing steel plate 13, i.e., along the recessed corner portion 4. A plurality of fixing brackets 14 can be disposed along the entire periphery of the flat area portion 2. Although not shown, the fixing bracket 14 is composed of a coated steel plate in which a core material made of a steel plate is coated with the same type of resin as the waterproof sheet 15. The resin coating may be applied only to the upper surface side of the core material. The thickness of the fixing bracket 14 may be the same as that of the second fixing steel plate 13, or one of the fixing brackets may be thicker than the other.

[0046] When comparing the size of the fixing metal fitting 14 and the size of the second fixing steel plate 13, the second fixing steel plate 13 is formed larger than the fixing metal fitting 14. As shown in Fig. 2, the dimension in the width direction (left and right direction in Fig. 2) of the second fixing steel plate 13 is set to be longer than the dimension in the width direction of the fixing metal fitting 14. As a result, one end in the width direction (the right end in Fig. 2) of the second fixing steel plate 13 protrudes beyond the right end of the fixing metal fitting 14 by a predetermined dimension or more. This predetermined dimension can be set to, for example, 10 mm or more, or 20 mm or more. The longitudinal dimension of the second fixing steel plate 13 and the longitudinal dimension of the fixing metal fitting 14 are set to be the same.

[0047] The fixing bracket 14 has a main body plate portion 14a formed so as to overlap the upper surface of the second fixing steel plate 13, and a protruding plate portion 14b protruding upward from the outer edge of the main body plate portion 14a. The main body plate portion 14a is formed so as to cover the head of the flat-field fastening material 22 that fastens the second fixing steel plate 13.

[0048] Providing the protruding plate portion 14b functions like a rib, suppressing deformation of the fixing metal fitting 14. The height of the protruding plate portion 14b is set lower than the first upright plate portion 12b of the first fixing steel plate 12. Note that the protruding plate portion 14b may be provided as necessary, and may be omitted.

[0049] The fixing bracket 14 is fixed to the second fixing steel plate 13 by a plurality of fixing bracket fastening materials (first fastening materials) 23. The fixing bracket fastening materials 23 are composed of drill screws, tapping screws, etc., and are provided at intervals in the longitudinal direction of the fixing bracket 14. The interval between the fixing bracket fastening materials 23 is called the pitch. That is, the fixing bracket fastening materials 23 penetrate the main body plate portion 14a of the fixing bracket 14 and are screwed into pilot holes formed in the second fixing steel plate 13, and also penetrate the second fixing steel plate 13 to reach the flat board 11a. The portion of the fixing bracket fastening materials 23 below the second fixing steel plate 13 is screwed into the flat board 11a.

[0050] The fixing bracket 14 is fastened to the second fixing steel plate 13 by the fastening material 23, whereas the second fixing steel plate 13 is fastened to the roof foundation 10 by the fastening material 22 for flat surfaces and is fastened to the roof foundation 10 via the fastening material 23 for fixing bracket and the flat board 11a. The pitch of the fastening material 22 for flat surfaces and the pitch of the fastening material 23 for fixing bracket are almost the same. Therefore, the second fixing steel plate 13 is fixed to the roof foundation 10 by more fastening points than the fastening points of the fixing bracket 14 to the second fixing steel plate 13.

[0051] The waterproof sheet 15 is composed of a flat area sheet 15a laid on the flat area 2 and a rising area sheet 15b attached to the rising area 3. The flat area sheet 15a and the rising area sheet 15b are polymer-based waterproof sheets, and can be composed of, for example, a polyvinyl chloride resin sheet or a thermoplastic elastomer waterproof sheet. The thickness of the flat area sheet 15a and the rising area sheet 15b is not particularly limited, but can be set to, for example, 1 mm or more.

[0052] The sheet 15a for flat areas is fixed to the upper surface of the fixing bracket 14 by welding with a solvent or by fusion with hot air. Since the fixing bracket 14 is arranged at the recessed corner 4, the sheet 15a for flat areas is prevented from floating up from the recessed corner 4 due to the movement of the sheet 15a for flat areas and the roof base 10 caused by aging, seasonal changes, and temperature differences between day and night, and the sheet 15a for flat areas is also prevented from breaking. In particular, since the fixing bracket 14 is fixed to the recessed corner 4 with the fastening material 23, it is also effective from the viewpoint of wind resistance. Incidentally, the waterproof sheet can be fixed to the flat area 2 by a fixing bracket such as a disk type that has been used conventionally.

[0053] (Renovation work compatible structure) In the rooftop waterproofing structure 1 configured as described above, waterproofing is ensured by the waterproof sheet 15 at the time of construction. However, the waterproof sheet 15 may deteriorate over time, resulting in a decrease in waterproofing performance. When the waterproofing performance decreases, renovation work is required, and generally, as shown in FIG. 17, a new waterproof sheet is attached on top of the old waterproof sheet while leaving the old waterproof sheet in place. However, if the renovation fixing metal fittings are fastened to the roof substrate by the renovation fastening material at this time, the ceiling is not stretched, so that cutting chips during drilling fall indoors and noise during drilling also becomes a problem. In the rooftop waterproofing structure 1 according to this embodiment, a structure for renovation work that can firmly fix the renovation fixing metal fittings while eliminating the need to drill holes in the roof substrate 10 is incorporated into the rooftop waterproofing structure 1 at the time of construction.

[0054] That is, as shown in Fig. 4, the second fixing steel plate 13 is provided with a fixing portion 13c for fixing a fixing bracket 30 for fixing a waterproof sheet 31 for renovation, which is different from the waterproof sheet 15 at the time of new installation. The fixing portion 13c for renovation is composed of a portion of the second fixing steel plate 13 excluding the penetration portion of the fastening material 22 for flat places and the penetration portion of the fastening material 23 for fastening brackets. The penetration portion of the fastening material 22 for flat places of the second fixing steel plate 13 is a portion for fixing the second fixing steel plate 13 to the roof foundation 10, and the penetration portion of the fastening material 23 for fastening brackets of the second fixing steel plate 13 is a portion for fixing the fastening material 14 to the second fixing steel plate 13, and the fastening material 32 for fastening the fixing bracket 30 for renovation cannot be passed through these penetration portions.

[0055] In other words, the renovation fastening material 32 can be passed through any portion (renovation fixing portion 13c) other than the penetration portion of the flat-area fastening material 22 and the penetration portion of the fastening material for the fixing bracket 23 in the second fixing steel plate 13. The fact that the renovation fastening material 32 can pass through the renovation fixing portion 13c means that the renovation fastening material 32 can be screwed into the penetration portion of the renovation fixing portion 13c, thereby fixing the renovation fixing bracket 30 to the renovation fixing portion 13c. A pilot hole may be formed in the portion where the renovation fastening material 32 is screwed.

[0056] In this embodiment, the repair fastening material 32 penetrates the repair fixing portion 13c between the penetration portion of the flat-area fastening material 22 and the penetration portion of the fastening material for fixing brackets 23. The repair fastening material 32 may penetrate further inward than the penetration portion of the flat-area fastening material 22, or may penetrate further outward than the fastening material for fixing brackets 23. Also, a plurality of repair fastening materials 32 may be provided.

[0057] The same fixing brackets 14 used at the time of new installation can be used as the repair fixing brackets 30. That is, the repair fixing brackets 30 have a main plate portion 30a and a protruding plate portion 30b, and are made of a coated steel plate (not shown) in which a core material made of steel plate is coated with the same type of resin as the new waterproof sheet (repair waterproof sheet) 31. The repair waterproof sheet 31 is the same as the (existing) waterproof sheet 15 at the time of new installation, but may be different from the one at the time of new installation.

[0058] The fastening material for renovation 32 is composed of a drill screw, a tapping screw, or the like, and is formed longer than the fastening material for the fixing fixture 23 used at the time of new construction. Specifically, the length of the fastening material for renovation 32 is set so as to penetrate the main plate portion 30a of the fixing fixture for renovation 30, the overlapping portion of the flat part sheet 15a and the rising part sheet 15b at the time of new construction, the main plate portion 14a of the fixing fixture 14 at the time of new construction, and the fixing part for renovation 13c. Furthermore, the fastening material for renovation 32 protrudes downward from the fixing part for renovation 13c, and the part protruding downward from the fixing part for renovation 13c reaches the flat board 11a. However, the upper limit of the length of the fastening material for renovation 32 is set so as not to reach the roof substrate 10.

[0059] (Renovation method) Next, a method for renovating the rooftop waterproofing structure 1 equipped with the above-mentioned structure for renovation work will be described. First, the renovation fixing bracket 30 is placed on the recessed corner portion 4 on the upper surface of the existing waterproof sheet 15. After that, the renovation fixing bracket 30 is fixed to the second fixing steel plate 13 by screwing the renovation fasteners 32 from above. The renovation fasteners 32 can be provided at intervals in the longitudinal direction of the renovation fixing bracket 30. After the renovation fixing bracket 30 is fixed, the renovation waterproof sheet 31 is fused and fixed to the upper surface of the renovation fixing bracket 30 with a solvent or with hot air.

[0060] (Effects of the embodiment) As described above, according to this embodiment, at the time of new installation, the first fixing steel plate 12 and the second fixing steel plate 13 are arranged so as to sandwich the flat board 11a in the thickness direction, and both fixing steel plates 12, 13 can be fixed to the roof foundation 10. Then, since the fixing metal fittings 14 at the time of new installation can be fixed to the second fixing steel plate 13 by the fixing metal fitting fastening material 23, it can be fixed to the roof foundation 10 via the second fixing steel plate 13. The waterproof sheet 15 fixed to the fixing metal fittings 14 at the time of new installation ensures waterproofness at the time of new installation.

[0061] When the waterproof sheet 15 deteriorates over the years since the new construction and repair work is to be carried out, the repair fixing metal fittings 30 can be fixed to the repair fixing parts 13c of the second fixing steel plate 13, and the repair fastening material 32 does not reach the roof base 10. Therefore, cutting chips do not fall indoors, and the transmission of noise to the indoors during repair is also suppressed. Then, the repair work is completed by fixing the repair waterproof sheet 31 to the repair fixing metal fittings 30.

[0062] In particular, recessed corners 4 are very important areas from the viewpoint of preventing defects and wind resistance of rooftop waterproofing structure 1. Even if existing fixing brackets (not shown) can be used in place of flat area 2 during renovation, it is preferable to install fixing brackets for recessed corners 4 separately from fixing brackets 14 as renovation fixing brackets 30.

[0063] Furthermore, compared to the case where only the first fixing steel plate 12 is provided, by providing the second fixing steel plate 13, the screwing position of the renovation fastening material 32 into the second fixing steel plate 13 and the screwing position into the renovation fixing bracket 30 are closer to each other, so that the structure can withstand repeated horizontal loads caused by temperature changes, wind, etc. This reduces loosening of the renovation fastening material 32. Also, since the renovation fastening material 32 can be short in length, costs can be reduced and workability is improved.

[0064] (Embodiment 2) Figures 5 and 6 relate to embodiment 2 of the present invention, with Fig. 5 showing the state at the time of new installation and Fig. 6 showing the state at the time of renovation. Embodiment 2 differs from embodiment 1 in that the second fixing steel plate 13 is fixed to the frame material 17 at the time of new installation, and that the renovation fixing bracket 30 is fixed to a portion extending in the vertical direction of the second fixing steel plate 13 at the time of renovation. Below, the same reference numerals are used for the same parts as in embodiment 1, and their explanation is omitted, and the different parts will be explained in detail.

[0065] As shown in FIG. 5, the second fixing steel plate 13 has a second horizontal plate portion 13a extending horizontally and a second rising plate portion 13b extending upward from the outer edge of the second horizontal plate portion 13a. The second horizontal plate portion 13a is a portion that is fixed to the roof foundation 10 in a state where it is disposed on the flat board 11a. The second rising plate portion 13b is a portion that extends in the vertical direction along the rising board 11b. The second rising plate portion 13b is fixed to the frame material 17 by a plurality of upper fastening members 24. The upper fastening members 24 are, for example, drill screws or tapping screws, and are provided at intervals in the longitudinal direction of the second fixing steel plate 13. That is, the upper fastening members 24 penetrate the second rising plate portion 13b and the rising board 11b in the horizontal direction, and then penetrate a part of the frame material 17 and are screwed into the part of the frame material 17. As a result, multiple locations of the second fixing steel plate 13 that are spaced apart in the vertical direction are fixed to the frame material 17 and the roof foundation 10, respectively, thereby increasing the fixing strength of the second fixing steel plate 13.

[0066] The second rising plate portion 13b of the second fixing steel plate 13 is provided with a renovation fixing portion 13d for fixing the renovation fixing bracket 30. The renovation fixing portion 13d is made up of the portion of the second rising plate portion 13b excluding the portion through which the upper fastening material 24 penetrates. This allows the renovation fastening material 33 to be passed through the renovation fixing portion 13d and screwed in, so that the renovation fixing bracket 30 can be fixed to the renovation fixing portion 13d.

[0067] 6, the protruding plate portion 30b of the renovation fixing bracket 30 protrudes upward to a position higher than the upper fastening material 24. The renovation fastening material 33 is configured to pass through the protruding plate portion 30b. The renovation fastening material 33 is positioned lower than the upper fastening material 24.

[0068] Therefore, during the renovation of the second embodiment, the renovation fixing bracket 30 can be placed on the recessed corner portion 4 on the upper surface of the existing waterproof sheet 15. After that, the renovation fastening material 33 is passed through the protruding plate portion 30b and the renovation fixing portion 13d from the side of the protruding plate portion 30b and screwed into the renovation fixing portion 13d, thereby fixing the renovation fixing bracket 30 to the second fixing steel plate 13. The renovation fastening materials 33 can be provided at intervals in the longitudinal direction of the renovation fixing bracket 30. After the renovation fixing bracket 30 is fixed, the renovation waterproof sheet 31 is fused and fixed to the renovation fixing bracket 30 by solvent welding or hot air fusion.

[0069] In the case of this embodiment 2, as in the case of embodiment 1, it is possible to prevent sawdust from falling indoors during renovation, thereby maintaining a good indoor environment, while at the same time fixing a new waterproof sheet 31 with high fixing strength.

[0070] (Embodiment 3) Fig. 7 relates to embodiment 3 of the present invention and shows the state at the time of new installation. Embodiment 3 differs from embodiment 1 in that at the time of new installation, the fixing bracket 14 and the second fixing steel plate 13 are fixed to the roof foundation 10 by a common fixing bracket fastening material 23. In the following, the same parts as in embodiment 1 are given the same reference numerals and their explanation is omitted, and the different parts will be explained in detail.

[0071] That is, the fastening material 23 for fixing metal of the third embodiment is longer than that of the first embodiment, and the length of the fastening material 23 for fixing metal is set so that the lower side of the fastening material 23 for fixing metal passes through the top of the ridge portion 10a of the roof underlayment 10. As a result, the lower side of the fastening material 23 for fixing metal is screwed into the top of the ridge portion 10a of the roof underlayment 10, so that the fastening material 23 for fixing metal can fix the fixing metal 14 and the second fixing steel plate 13 to the roof underlayment 10.

[0072] In the case of this embodiment 3, as in embodiment 1, it is possible to prevent sawdust from falling indoors during renovation, thereby maintaining a good indoor environment, while at the same time fixing a new waterproof sheet 31 with high fixing strength.

[0073] In addition, in this embodiment 3, the fastening material 23 for the fixing bracket penetrates the second fixing steel plate 13 and is also screwed into the second fixing steel plate 13, which further improves the fixing strength and prevents the fastening material 23 for the fixing bracket from coming loose.

[0074] (Embodiment 4) Fig. 8 relates to the fourth embodiment of the present invention and shows the case when newly installed. The fourth embodiment differs from the first embodiment in that the fixing bracket 14 and the second fixing steel plate 13 are fixed to the roof foundation 10 with a common fixing bracket fastening material 23 when newly installed, and in that the flat surface fastening material 22 is omitted. In the following, the same parts as those in the first embodiment are given the same reference numerals and their explanation is omitted, and the different parts will be explained in detail.

[0075] In the fourth embodiment, the length of the fastening material 23 for the fixing bracket is set so that the fastening material 23 for the fixing bracket penetrates the top of the peak portion 10a of the roof underlayment 10 without using the flat area fastening material 22. This allows the fastening material 23 to fix the fixing bracket 14 and the second fixing steel plate 13 to the roof underlayment 10, similar to the third embodiment.

[0076] In the case of this embodiment 4, as in embodiment 1, it is possible to prevent sawdust from falling indoors during renovation, thereby maintaining a good indoor environment, while at the same time fixing a new waterproof sheet 31 with high fixing strength.

[0077] In addition, in this fourth embodiment, the flat-ground fastening material 22 is omitted, so that the number of parts can be reduced, and the effort and cost required for repairs can be reduced.

[0078] 9, the waterproof sheet for renovation 31 can be attached to the flat area sheet 15a and the rising area sheet 15b at the time of new construction with adhesive S (shown by hatching). With this adhesive method, there is no need to install fixing metal fittings in areas other than the recessed corners 4, and no need to use fastening materials for the fixing metal fittings, so problems such as cutting chips do not occur.

[0079] (Embodiment 5) Fig. 10 relates to the fifth embodiment of the present invention and shows the case when newly installed. Moreover, Fig. 11 shows the case when the fifth embodiment is renovated. The fifth embodiment differs from the first embodiment in that the second fixing steel plate 13 is not directly fixed to the roof foundation 10. In the following, the same parts as those in the first embodiment are given the same reference numerals and their explanation is omitted, and the different parts will be explained in detail.

[0080] That is, in the fourth embodiment, the peaks 10a of the roof underlayment 10 are located inward compared to those in the first embodiment. Therefore, the flat-site fastening material 22 is located at a position corresponding to the valleys 10b of the roof underlayment 10, and is not screwed into the roof underlayment 10. Therefore, the second fixing steel plate 13 is not directly fixed to the roof underlayment 10, but is fixed to the first fixing steel plate 12 by the flat-site fastening material 22. Since the first fixing steel plate 12 is fixed to the peaks 10a of the roof underlayment 10 by the horizontal plate fastening material 20, the second fixing steel plate 13 is fixed to the roof underlayment 10 via the first fixing steel plate 12.

[0081] In the case of this embodiment 5, as in embodiment 1, it is possible to prevent sawdust from falling indoors during renovation, thereby maintaining a good indoor environment, while at the same time fixing a new waterproof sheet 31 with high fixing strength.

[0082] (Embodiment 6) Fig. 12 relates to embodiment 6 of the present invention and shows the case when newly installed. Fig. 13 shows embodiment 6 when renovated. Embodiment 6 differs from embodiment 1 in that it is provided with a roof underlayment 100 whose upper surface is flat. In the following, the same parts as embodiment 1 will be given the same reference numerals and their explanation will be omitted, and the different parts will be explained in detail.

[0083] The rooftop waterproof structure 1 according to the sixth embodiment includes a roof foundation 100 made of reinforced concrete (RC), a board 11, a fixing steel plate 130, a fixing bracket 14, and a waterproof sheet 15. The upper surface of the roof foundation 100 is flat. The board 11 is disposed on the upper surface of the roof foundation 100. The fixing steel plate 130 fixed to the roof foundation 100 is disposed on the board 11. The fixing steel plate 130 is fixed to the roof foundation 100 by a plurality of flat site fastening members 22. The flat site fastening members 22 are screwed into the roof foundation 100. The fixing steel plate 130 is provided with a renovation fixing portion 130c for fixing a renovation fixing bracket 30 to which a renovation waterproof sheet 31 different from the waterproof sheet 15 at the time of new construction is fixed.

[0084] The fixing bracket 14 is disposed on the fixing steel plate 130 and is fixed to the roof foundation 100 by a fastening material 230. The fastening material 230 penetrates the fixing bracket 14, the fixing steel plate 130, and the board 11, and is screwed into the roof foundation 100.

[0085] During renovation, as shown in Fig. 13, the renovation fixing bracket 30 is placed on the recessed corner part 4 on the upper surface of the existing waterproof sheet 15. The renovation fastener 320 is then screwed in from above to fix the renovation fixing bracket 30 to the renovation fixing part 130c of the fixing steel plate 130. After the renovation fixing bracket 30 is fixed, the renovation waterproof sheet 31 is fused and fixed to the upper surface of the renovation fixing bracket 30 with a solvent or with hot air.

[0086] In the case of this embodiment 6, as in embodiment 1, it is possible to prevent sawdust from falling indoors during renovation, thereby maintaining a good indoor environment, while at the same time fixing a new waterproof sheet 31 with high fixing strength.

[0087] (Embodiment 7) Fig. 14 relates to the seventh embodiment of the present invention and shows the case when newly installed. Fig. 15 shows the case when the seventh embodiment is renovated. The seventh embodiment differs from the sixth embodiment in that it does not have the flat-area fastening material 22, and other parts are the same as the sixth embodiment, so the same parts as the sixth embodiment are given the same reference numerals and their explanations are omitted. As in the seventh embodiment, even without the flat-area fastening material 22, the fixing steel plate 130 can be fixed to the roof foundation 100 by the fastening material 230 together with the fixing bracket 14.

[0088] (Other embodiments) The above-described embodiment is merely illustrative in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention.

[0089] The shape of the second fixing steel plate 13 is not limited to the above-mentioned shape, and may be, for example, a shape in which the end portion is folded back. [Industrial Applicability]

[0090] As described above, the rooftop waterproofing structure according to the present invention can be applied to roofs with metal roof foundations or RC foundations, for example. [Explanation of symbols]

[0091] 1. Rooftop waterproofing structure 10 Roof underlayment 11 Board 11b Start-up board 12 First fixing steel plate 12b 1st standing plate part 13 Second fixing steel plate 13b 2nd standing plate part 13c Fixture for repair 13d Fixing part for repair 14 Fixing bracket (new installation) 17 Frame material (roof component) 20 Fastening material for horizontal plate section (second fastening material) 23 Fastening material for fixing bracket (first fastening material) 15 Waterproof sheet (when newly installed) 30 Fixtures for renovation 31 Waterproofing Sheet for Renovation 32 Repair fasteners 100 Roof Underlayment

Claims

1. In the rooftop waterproofing structure of buildings, Roof underlayment and A board disposed on the roof substrate; A first fixing steel plate disposed between the board and the roof foundation and fixed to the roof foundation; A second fixing steel plate is disposed on the board and fixed to the roof base or the first fixing steel plate; A fixing metal fitting disposed on the second fixing steel plate; A first fastening material that fastens the fastening metal fitting to at least the second fastening steel plate; A waterproof sheet fixed to the fixing bracket, A rooftop waterproofing structure in which the second fixing steel plate is provided with a renovation fixing portion for fixing a renovation fixing bracket to which a renovation waterproof sheet different from the waterproof sheet is fixed.

2. The rooftop waterproofing structure according to claim 1, A roof waterproofing structure in which the first fastening material penetrates the second fixing steel plate and the first fixing steel plate and is screwed into the roof foundation.

3. The rooftop waterproofing structure according to claim 2, A rooftop waterproofing structure in which the first fastening material penetrates the fixing bracket.

4. In the rooftop waterproofing structure according to any one of claims 1 to 3, A rooftop waterproofing structure in which the second fixing steel plate is formed larger than the fixing metal fittings and is fixed to the roof substrate by more fastening points than the fastening points of the fixing metal fittings to the second fixing steel plate.

5. In the rooftop waterproofing structure according to any one of claims 2 to 4, A rooftop waterproofing structure comprising a second fastening material for fastening the first fixing steel plate to the roof substrate.

6. The rooftop waterproofing structure according to any one of claims 1 to 5, The board includes a rising board extending upward and fixed to a roof component disposed above the roof base, The first fixing steel plate has a first rising plate portion disposed between the roof constituent member and the rising board and fixed to the roof constituent member, The second fixing steel plate has a second rising plate portion extending upward along the rising board and fixed to the roof constituent member, The repair fixing portion is provided on the second rising plate portion of the rooftop waterproofing structure.

7. In the rooftop waterproofing structure of buildings, A roof base having a flat upper surface; A board disposed on the roof substrate; A fixing steel plate extending long along the corner of the roof on the board and arranged around the entire periphery of the flat part of the roof and fixed to the roof substrate; A fixing bracket disposed on the fixing steel plate; A waterproof sheet fixed to the fixing bracket, A rooftop waterproofing structure in which the fixing steel plate is provided with a renovation fixing portion for fixing a renovation fixing bracket to which a renovation waterproof sheet different from the waterproof sheet is fixed.

Images