JP7650501B2 - Rooftop waterproof structure - Google Patents

Description

The present invention relates to a rooftop waterproofing structure that can be renovated.

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 the metal roofing base, and a waterproof sheet laid on top of the board, and the waterproof sheet ensures that the roof is waterproof (see, for example, Patent Documents 1 and 2).

Figure 16 shows an example of a conventional rooftop waterproofing structure at the time of installation. As shown in this figure, 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.

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 board, are fixed to the metal roof base using renovation fastening materials. A new waterproof sheet is then fixed to the renovation fixing brackets.

However, there is an issue with this: if the building is a factory or warehouse, there is often no ceiling on the interior side of the metal roof. As a result, as shown in Figure 17, chips generated when drilling holes in the existing metal roof base with the repair fixture may fall inside the building, causing a negative impact on the indoor environment, i.e. on the machinery and equipment inside, the products being produced, and the workers.

Examples of renovation work to prevent such adverse effects include a method disclosed in Patent Document 3 in which a renovation fixture is fastened to the fixture to which the existing waterproof sheet is attached, and a new waterproof sheet is then fixed to the renovation fixture, and a method disclosed in Patent Document 4 in which an unwelded/fused portion of the waterproof sheet is provided in advance on the corner fixture, and during renovation, the old waterproof sheet is removed in a strip shape from that portion, exposing the unwelded/fused portion of the corner fixture, and a new waterproof sheet is fixed to the exposed portion.

JP 2018-31218 A Japanese Patent Application Publication No. 9-302783 JP 2011-80212 A JP 2002-349018 A

However, in the renovation method of Patent Document 3, the renovation fixing brackets are fastened to the existing fixing brackets, so the above-mentioned problems caused by sawdust do not occur. However, the fixing strength of the renovation fixing brackets depends on the fixing strength of the fastening material of the existing fixing brackets to the metal roof base. 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 brackets will also decrease, which will ultimately decrease the fixing strength of the new waterproof sheet.

The repair method in Patent Document 4 also does not require the use of new fastening materials to secure the fixtures, so no cutting chips are generated. However, the unfused and fused parts of the existing corner fixtures may have deteriorated over time, and if deterioration has progressed, the fixing strength of the new waterproof sheet will be reduced.

In particular, when waterproofing the corners of metal roofing underlayment, in most cases no consideration is given to the next time the roof is renovated.

The present invention was made in consideration of these points, and its purpose is to prevent sawdust from falling indoors during renovations, thereby maintaining a good indoor environment, while allowing new waterproof sheets to be fixed with high fixing strength.

In order to achieve the above object, in a first aspect of the present disclosure, a rooftop waterproof structure for a building can be assumed. The rooftop waterproof structure includes a roof substrate, a board arranged on the roof substrate, a first fixing steel plate arranged between the board and the roof substrate and fixed to the roof substrate, a second fixing steel plate arranged on the board and fixed to the roof substrate, a fixing bracket arranged on the second fixing steel plate, a first fastening material that fixes the fixing bracket to at least the second fixing steel plate, and a waterproof sheet fixed to the fixing bracket. 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.

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 bracket is fixed to at least the second fixing steel plate by the first fastening material, so that it is fixed to the roof foundation via the second fixing steel plate. Waterproofing can be ensured by the waterproof sheet fixed to the fixing bracket.

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 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.

In a second aspect of the present disclosure, the first fastening material is screwed into the roof substrate through the second fixing steel plate and the first fixing steel plate.

With this configuration, the first and second fixing steel plates can be fixed to the roof substrate using a common first fastening material.

In a third aspect of the present disclosure, the first fastening material penetrates the fixing bracket.

With this configuration, the first fastening material that secures the first and second fixing steel plates can also secure the fixing brackets to the roof substrate.

In a fourth aspect of the present disclosure, 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.

With this configuration, the second fixing steel plate is larger than the fixing bracket and has many fastening points to the roof substrate, so the fixing strength of the repair fixing bracket fixed to the second fixing steel plate is sufficiently ensured.

In a fifth aspect of the present disclosure, a second fastening material is provided to fasten the first fixing steel plate to the roof substrate.

With this configuration, the first fastening steel plate can be fixed to the roof substrate by the first fastening material and the second fastening material, thereby increasing the fastening strength of the first fastening steel plate and, in turn, increasing the fastening strength of the second fastening steel plate.

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.

This configuration makes it possible to fix the second fixing steel plate to a roof component separate from the roof base.

In the seventh aspect of the present disclosure, a rooftop waterproofing structure having a roof substrate with a planar upper surface can be assumed. The rooftop waterproofing structure includes a board arranged on the roof substrate, a fixing steel plate arranged on the board and fixed to the roof substrate, a fixing bracket arranged on the fixing steel plate, and a waterproof sheet fixed to the fixing bracket, and 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.

With this configuration, during renovation work, the renovation fixing brackets can be fixed to the renovation fixing parts of the fixing steel plate, so cutting chips do not fall inside the building. Then, the renovation work is completed by fixing the renovation waterproof sheet to the renovation fixing brackets.

As explained above, when carrying out renovation work many years after the original construction, the renovation waterproof sheet can be fixed with high fixing strength while preventing sawdust from falling indoors when fixing the renovation fixing brackets, maintaining a good indoor environment.

1 is a perspective view showing a partial cross section of a rooftop waterproofing structure according to a first embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of a rooftop waterproofing structure according to the first embodiment of the present invention at the time of new installation. FIG. 2 is a view equivalent to FIG. 1 during repair according to the first embodiment of the present invention. FIG. 3 is a view equivalent to FIG. 2 during repair according to the first embodiment of the present invention. FIG. 4 is a view corresponding to FIG. 2 according to a second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 4 according to a second embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 2 according to a third embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 2 according to a fourth embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 3 according to a modified example. FIG. 11 is a view corresponding to FIG. 2 according to a fifth embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 4 according to a fifth embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 2 according to a sixth embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 4 according to a sixth embodiment of the present invention. FIG. 11 is a view corresponding to FIG. 2 according to a seventh embodiment of the present invention. FIG. 13 is a view corresponding to FIG. 4 according to a seventh embodiment of the present invention. FIG. 1 is a cross-sectional view of a conventional rooftop waterproofing structure at the time of new construction. FIG. 1 is a cross-sectional view of a conventional rooftop waterproofing structure during renovation.

The following describes in detail an embodiment of the present invention with reference to the drawings. Note that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its applications, or its uses.

(Embodiment 1)
Fig. 1 shows a rooftop waterproofing structure 1 according to a first embodiment of the present invention. The rooftop waterproofing 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.

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.

The roof 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, each valley 10b of the roof underlayment 10 is 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 reinforced concrete foundations, the building may be a hospital or nursing home.

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 section 2, and a rising board 11b that extends upward from the periphery of the flat board 11a and constitutes the rising section 3. The flat board 11a is also fastened to the top of the peak section 10a of the roof underlayment 10 with, for example, drill screws or tapping screws, etc., in addition to the recessed corner section 4.

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 the foam. Examples of the surface material that can be used include waterproof paper, aluminum foil, aluminum-deposited paper, and plastic films with a thermoplastic elastomer attached.

The board 11 may be made by covering the surface of the foam used in the heat insulating material with a thin metal plate. The thickness of the metal plate may be, for example, 0.5 mm or less, but is not limited to this. The board 11 may be made of a wood-based cement board. The wood-based cement board is made by compression molding using wood raw materials such as wood wool and wood chips as the 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 stacked together. The thickness of the board 11 may be, for example, 15 mm or more, but is not limited to this.

The rooftop waterproofing structure 1 is equipped with a metal frame material (roof component) 17 arranged above the roof substrate 10. The frame material 17 is formed so as to surround the flat area 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 rise board 11b are fixed to the upper and lower frame materials 17, respectively. The rise board 11b can be fixed to the frame material 17 with, for example, drill screws or tapping screws. The rise board 11b may be fixed only with drill screws or tapping screws, but 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.

When laying and fixing the flat board 11a to the roof underlayment 10 at the time of new construction, the flat area 2 can be directly fixed to the peak 10a of the roof underlayment 10 with drill screws or tapping screws. However, if the valley 10b of the roof underlayment 10 is located just below the recessed corner 4 where the flat area 2 and the rising part 3 intersect, the flat board 11a cannot be fixed to the roof underlayment 10 at the recessed corner 4. Therefore, as shown in FIG. 2, a first fixing steel plate 12 is installed in advance at the recessed corner 4. The first fixing steel plate 12 extends long along the recessed corner 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 2. This allows the flat board 11a to be fixed to the first fixing steel plate 12 even at the recessed corner 4.

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 Figure 2. "Inside" refers to the inner side in the horizontal direction of the rooftop waterproofing structure 1, which is the right side in Figure 2.

The first horizontal plate portion 12a and the first rising plate portion 12b can be obtained by press forming a single 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 has been applied to the 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 ensuring 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.

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 materials 20. The horizontal plate portion fastening material 20 is a member corresponding to the second fastening material of the present invention, and is a member constituting the roof waterproof structure 1. The horizontal plate portion fastening material 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 materials 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 fastening material 20 can be 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.

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 that is 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 materials 21. The rising plate portion fastening materials 21 are members that constitute the rooftop waterproof structure 1. The rising plate portion fastening materials 21 are composed of drill screws, tapping screws, etc., and are provided at intervals in the longitudinal direction of the first fixing steel plate 12. The interval between the rising plate portion fastening materials 21 is called the pitch. With the first rising plate portion 12b positioned adjacent to the frame material 17, the rising plate portion fastening material 21 can be screwed 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, thereby fastening the first rising plate portion 12b to the frame material 17.

The second fixing steel plate 13 is fixed to the roof foundation 10 while being disposed on the flat board 11a. The second fixing steel plate 13 extends long along the recessed corner portion 4, and multiple second fixing steel plates 13 can be disposed around the entire periphery of the flat area portion 2. In a plan view, the second fixing steel plate 13 is disposed in an area 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. Furthermore, the first fixing steel plate 12 and the second fixing steel plate 13 may have different thicknesses.

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 fastening members 22. The flat 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 fastening members 22 is called the pitch. In other words, the flat 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 fastening members 22 are screwed into pilot holes formed at the top of the peak 10a of the roof underlayment 10, thereby fixing the second fixing steel plate 13 and the flat board 11a to the top of the peak 10a of the roof underlayment 10.

The flat surface 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 surface 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 underlayment 10 by the flat surface fastening material 22.

The fixing bracket 14 is disposed on the second fixing steel plate 13. Specifically, the bottom surface of the fixing bracket 14 overlaps the top 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 section 2. Although not shown, the fixing bracket 14 is composed of a coated steel plate in which a steel plate core material is coated with the same type of resin as the waterproof sheet 15. The resin coating may be applied only to the top surface 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.

When comparing the size of the fixing bracket 14 and the size of the second fixing steel plate 13, the second fixing steel plate 13 is formed larger than the fixing bracket 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 bracket 14. As a result, one end in the width direction of the second fixing steel plate 13 (the right end in FIG. 2) protrudes a predetermined dimension or more beyond the right end of the fixing bracket 14. 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 bracket 14 are set to be the same.

The fixing bracket 14 has a main body plate portion 14a formed 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 to cover the head of the flat surface fastening material 22 that fastens the second fixing steel plate 13.

The protruding plate portion 14b functions like a rib, suppressing deformation of the fixing bracket 14. The height of the protruding plate portion 14b is set lower than the first rising plate portion 12b of the first fixing steel plate 12. The protruding plate portion 14b may be provided as needed, or may be omitted.

The fixing bracket 14 is fixed to the second fixing steel plate 13 by a plurality of fastening materials (first fastening materials) 23 for the fixing bracket. The fastening materials 23 for the fixing bracket 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 fastening materials 23 for the fixing bracket is called the pitch. That is, the fastening materials 23 for the fixing bracket penetrate the main plate portion 14a of the fixing bracket 14 and are screwed into pilot holes formed in the second fixing steel plate 13, and penetrate the second fixing steel plate 13 to reach the flat board 11a. The portion of the fastening materials 23 below the second fixing steel plate 13 is screwed into the flat board 11a.

The fixing bracket 14 is fastened to the second fixing steel plate 13 by the fastening material 23, while the second fixing steel plate 13 is fastened to the roof underlayment 10 by the flat surface fastening material 22 and is fastened to the roof underlayment 10 via the fastening material 23 and the flat board 11a. The pitch of the flat surface fastening material 22 and the pitch of the fastening material 23 are almost the same. Therefore, the second fixing steel plate 13 is fixed to the roof underlayment 10 by more fastening points than the fastening points of the fixing bracket 14 to the second fixing steel plate 13.

The waterproof sheet 15 is composed of a flat section sheet 15a that is laid on the flat section 2, and a rising section sheet 15b that is adhered to the rising section 3. The flat section sheet 15a and the rising section 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 section sheet 15a and the rising section sheet 15b is not particularly limited, but can be set to, for example, 1 mm or more.

The flat area sheet 15a is fixed to the top surface of the fixing bracket 14 by welding with a solvent or by fusion with hot air. Since the fixing bracket 14 is arranged in the recessed corner 4, it is possible to prevent the flat area sheet 15a from floating up from the recessed corner 4 due to the movement of the flat area sheet 15a and the roof underlayment 10 caused by aging, seasonal changes, and temperature differences between day and night, and it is also possible to prevent the flat area sheet 15a from breaking. In particular, since the fixing bracket 14 is fixed to the recessed corner 4 with a 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.

(Structure suitable for renovation work)
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 is decreased, renovation work is required. In general, as shown in FIG. 17, the old waterproof sheet is left in place and a new waterproof sheet is attached on top of the old waterproof sheet. 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.

That is, as shown in FIG. 4, the second fixing steel plate 13 is provided with a fixing portion 13c for fixing the fixing bracket 30 for fixing the 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 the portion excluding the penetration portion of the fastening material 22 for flat areas and the fastening material 23 for the fastening material in the second fixing steel plate 13. The penetration portion of the fastening material 22 for flat areas in the second fixing steel plate 13 is the portion for fixing the second fixing steel plate 13 to the roof foundation 10, and the penetration portion of the fastening material 23 for the fastening material in the second fixing steel plate 13 is the portion for fixing the fastening material 14 to the second fixing steel plate 13, and the fastening material 32 for fixing the fixing bracket 30 for renovation cannot penetrate these penetration portions.

In other words, the renovation fastening material 32 can be passed through any portion of the second fixing steel plate 13 other than the penetration portion of the flat fastening material 22 and the penetration portion of the fastening material for the fixing bracket 23 (the renovation fixing portion 13c). 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.

In this embodiment, the repair fastening material 32 penetrates the repair fixing portion 13c between the penetration portion of the flat surface fastening material 22 and the penetration portion of the fastening material for the fixing bracket 23. This is not limiting, but the repair fastening material 32 may penetrate further inward than the penetration portion of the flat surface fastening material 22, or may penetrate further outward than the fastening material for the fixing bracket 23. Also, multiple repair fastening materials 32 may be provided.

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.

The fastening material for renovation 32 is composed of drill screws, tapping screws, etc., and is formed longer than the fastening material for the fixing bracket 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 bracket for renovation 30, the overlapping portion of the flat section sheet 15a and the rising section sheet 15b at the time of new construction, the main plate portion 14a of the fixing bracket 14 at the time of new construction, and the fixing portion for renovation 13c. Furthermore, the fastening material for renovation 32 protrudes downward from the fixing portion for renovation 13c, and the portion protruding downward from the fixing portion 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 underlayment 10.

(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. Then, 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.

(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 waterproofing at the time of new installation.

When the waterproof sheet 15 deteriorates over the years since it was first installed and repair work is required, the repair fixing bracket 30 can be fixed to the repair fixing portion 13c of the second fixing steel plate 13, and the repair fastening material 32 does not reach the roof base 10. This prevents sawdust from falling indoors and also suppresses the transmission of noise to the interior during repair work. The repair work is then completed by fixing the repair waterproof sheet 31 to the repair fixing bracket 30.

The recessed corners 4 in particular are extremely important in terms of preventing defects and wind resistance of the rooftop waterproofing structure 1. Even if the flat area 2 can be substituted with existing fasteners (not shown) during renovation, it is preferable to install the fasteners for the recessed corners 4 separately from the fasteners 14 as renovation fasteners 30.

In addition, compared to when 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, making it possible to create a structure that can withstand repeated horizontal loads caused by temperature changes, wind, etc. This reduces loosening of the renovation fastening material 32. Also, since the length of the renovation fastening material 32 can be short, costs can be reduced and workability can be improved.

(Embodiment 2)
Figures 5 and 6 relate to a second embodiment of the present invention, with Figure 5 showing a new installation and Figure 6 showing a renovation. The second embodiment differs from the first embodiment 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. 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.

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 underlayment 10 while being 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. This allows multiple locations of the second fixing steel plate 13 that are spaced apart in the vertical direction to be fixed to the frame material 17 and the roof base 10, increasing the fixing strength of the second fixing steel plate 13.

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 composed of the second rising plate portion 13b except for 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.

As shown in FIG. 6, the protruding plate portion 30b of the repair fixture 30 protrudes upward to a position higher than the upper fastening material 24. The repair fastening material 33 is designed to pass through the protruding plate portion 30b. The repair fastening material 33 is positioned lower than the upper fastening material 24.

Therefore, when renovating in embodiment 2, the renovation fixing bracket 30 can be placed on the recessed corner portion 4 on the upper surface of the existing waterproof sheet 15. The renovation fastening material 33 is then 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 to fix 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 with a solvent or with hot air.

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 the new waterproof sheet 31 with high fixing strength.

(Embodiment 3)
7 shows a third embodiment of the present invention at the time of new installation. The third embodiment differs from the first embodiment 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 those in the first embodiment are given the same reference numerals and their explanations are omitted, and the different parts are explained in detail.

In other words, the fastening material 23 for the fixing bracket in the third embodiment is longer than that in the first embodiment, and the length of the fastening material 23 for the fixing bracket is set so that the lower side of the fastening material 23 for the fixing bracket passes through the top of the peak portion 10a of the roof underlayment 10. As a result, the lower side of the fastening material 23 for the fixing bracket is screwed into the top of the peak portion 10a of the roof underlayment 10, so that the fastening material 23 for the fixing bracket can fix the fixing bracket 14 and the second fixing steel plate 13 to the roof underlayment 10.

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

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.

(Embodiment 4)
8 shows the fourth embodiment of the present invention at the time of new installation. 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 by a common fixing bracket fastening material 23 at the time of new installation, and in that the flat area 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 are explained in detail.

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 fastening material for flat surfaces 22. As a result, the fastening material 23 for the fixing bracket can fix the fixing bracket 14 and the second fixing steel plate 13 to the roof underlayment 10, similar to the third embodiment.

In the case of this embodiment 4, 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 the new waterproof sheet 31 with high fixing strength.

In addition, in this embodiment 4, the flat surface fastening material 22 is omitted, which reduces the number of parts and reduces the effort and cost required for repairs.

As shown in the modified example in Figure 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 using adhesive S (shown by hatching). With this adhesive method, there is no need to install fixing brackets in any area other than the recessed corner 4, and no need to use fastening materials for the fixing brackets, so problems such as cutting chips do not occur.

(Embodiment 5)
Fig. 10 shows the fifth embodiment of the present invention at the time of new installation. Fig. 11 shows the fifth embodiment at the time of repair. 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.

In other words, 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 area fastening material 22 is located at a location 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 area 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.

In the case of this embodiment 5, 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 the new waterproof sheet 31 with high fixing strength.

(Embodiment 6)
Fig. 12 shows the sixth embodiment of the present invention at the time of new construction. Fig. 13 shows the sixth embodiment at the time of repair. The sixth embodiment differs from the first embodiment in that it is provided with a roof underlayment 100 having a flat upper surface. In the following, the same parts as those in the first embodiment are given the same reference numerals and their explanations are omitted, and the different parts are explained in detail.

The rooftop waterproof structure 1 according to the sixth embodiment includes a roof base 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 base 100 is flat. The board 11 is disposed on the upper surface of the roof base 100. A fixing steel plate 130 fixed to the roof base 100 is disposed on the board 11. The fixing steel plate 130 is fixed to the roof base 100 by a plurality of flat fastening members 22. The flat fastening members 22 are screwed into the roof base 100. The fixing steel plate 130 is provided with a repair fixing portion 130c for fixing a repair fixing bracket 30 to which a repair waterproof sheet 31 different from the waterproof sheet 15 at the time of installation is fixed.

The fixing bracket 14 is disposed on the fixing steel plate 130 and is fixed to the roof underlayment 100 by the 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 underlayment 100.

During renovation, as shown in FIG. 13, the renovation fixing bracket 30 is placed on the recessed corner portion 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 portion 130c of the fixing steel plate 130. After the renovation fixing bracket 30 is fixed, the renovation waterproof sheet 31 is fused to the upper surface of the renovation fixing bracket 30 by welding with a solvent or by fusion with hot air.

In the case of this embodiment 6, 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 the new waterproof sheet 31 with high fixing strength.

(Embodiment 7)
Fig. 14 shows the seventh embodiment of the present invention at the time of new installation. Fig. 15 shows the seventh embodiment at the time of repair. 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 the description is 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.

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.

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 is folded back.

As described above, the rooftop waterproofing structure of the present invention can be applied to roofs with metal roofing substrates or reinforced concrete substrates, for example.

1 rooftop waterproof structure 10 roof base 11 board 11b rising board 12 first fixing steel plate 12b first rising plate portion 13 second fixing steel plate 13b second rising plate portion 13c repair fixing portion 13d repair fixing portion 14 fixing metal fitting (at the time of new construction)
17 Frame material (roof component)
20 Fastening material for horizontal plate portion (second fastening material)
23 Fastening material for fixing bracket (first fastening material)
15. Waterproof sheet (when newly installed)
30 Fixing bracket for renovation 31 Waterproof sheet for renovation 32 Fixing material for renovation 100 Roof underlay

Claims (7)

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