Roof waterproofing structure

Abstract

To reduce the peeling force generated at the stepped portion of the joint at the upper edge of the second waterproofing sheet caused by the flow of rainwater through the first waterproofing sheet that makes up the roof surface, [Solution] The roof waterproofing structure 100 comprises a membrane roofing material 110 that constitutes the roof surface 21, a waterproof sheet 120 adhered to the membrane roofing material 110, and a tapered member 150 provided at the stepped portion 102 of the joint between the upper end portion 122 of the waterproof sheet 120 and the membrane roofing material 110, the tapered member 150 whose upper surface 152 approaches the waterproof sheet 120 as it goes upward.

Description

Technical Field

[0001] The present invention relates to a roof waterproof structure.

Background Art

[0002] Patent Document 1 discloses a technology related to the joint structure between two antifouling film materials. In this prior art, a plurality of heat-meltable resin film materials are arranged side by side, and among the opposing edges of adjacent two film materials, the edges of the two film materials are overlapped with each other such that the back surface of the edge of one film material is joined to the surface of the edge of the other film material facing this edge. The general surface of one film material excluding the surface of its edge is coated with a titanium oxide film, and the surface of the other film material is also coated with a titanium oxide film. At the middle part in the width direction of the overlapping part of the two edges, the two edges are heat-welded to each other.

[0003] Patent Document 2 discloses a technology related to the joint structure of the film surface in a film structure. In this prior art, the joint structure of the film surface arranges eyelets in a row at the joint edge of the film panels facing each other with a reinforcing cable sandwiched therebetween, joins the reinforcing cable and the film panel through mounting members inserted into each eyelet, covers the upper part of the joint of the film panel and the reinforcing cable with an external auxiliary film, and joins the end of the auxiliary film to each film panel.

[0004] Patent Document 3 discloses a technology related to a sloping pedestal for eliminating a step. In this prior art, the sloping pedestal for eliminating a step is provided with an appropriate number of saw-blade-shaped transverse grooves along the width direction on the surface of the inclined surface, and a cutting groove is provided perpendicularly from the bottom of this transverse groove to at least one cross-section of the sloping pedestal in the floor surface direction, and by cutting and dividing the sloping pedestal at an appropriate location along this cutting groove, it is possible to adjust the vertical surface to the height of the step, and elastic members are adhered to the floor surface and the inclined surface of the sloping pedestal.

[0005] Patent Document 4 discloses a slope-forming device that is placed on a step created by a trim member to form a slope. In this prior art, the slope-forming device comprises a height adjustment plate with a triangular cross-section whose thickness gradually decreases from one end to the other, and an outer inclined plate superimposed on it. The outer inclined plate is formed from a front end with a thickness that contacts the side surface of the trim member forming the step, a rear end located on the opposite side of the front end, and an outer surface that slopes downward from the upper edge of the front end toward the edge of the rear end that contacts the floor surface. The height adjustment plate is provided with multiple cuttable indicators that show the thickness of each part from one end toward the other. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-210268 [Patent Document 2] Japanese Patent Application Publication No. 1-260180 [Patent Document 3] Japanese Patent Application Publication No. 8-86077 [Patent Document 4] Japanese Patent Publication No. 2004-27749 [Overview of the project] [Problems that the invention aims to solve]

[0007] In a roof where the upper end of a second waterproof sheet is joined to a first waterproof sheet that makes up the roof surface, rainwater flow can cause peeling forces to be generated over a long period of time at the stepped joint of the upper end of the second waterproof sheet, which may cause the upper end of the second waterproof sheet to peel off.

[0008] The purpose of this invention is to reduce the peeling force generated at the stepped portion of the joint at the upper end of the second waterproof sheet caused by the flow of rainwater through the first waterproof sheet that constitutes the roof surface. [Means for solving the problem]

[0009] The first embodiment is a roof waterproofing structure comprising a first waterproof sheet that constitutes the roof surface, a second waterproof sheet adhered on the first waterproof sheet, and a tapered member provided at the stepped portion of the joint between the upper end of the second waterproof sheet and the first waterproof sheet, the tapered member whose upper surface approaches the second waterproof sheet as it goes upward.

[0010] In the first embodiment of the roof waterproofing structure, the peeling force generated at the joint portion of the upper end of the second waterproofing sheet by the flow of rainwater through the first waterproofing sheet that constitutes the roof surface is reduced by the tapered member. As a result, the second waterproofing sheet becomes less likely to peel off, and its durability is improved.

[0011] The second embodiment is the roof waterproofing structure described in the first embodiment, wherein there is a gap between the upper end of the second waterproofing sheet and the lower end of the tapered member.

[0012] In the second embodiment of the roof waterproofing structure, there is a gap between the upper end of the second waterproofing sheet and the lower end of the tapered member, and they are not joined together. Therefore, even if the tapered member is peeled off by rainwater flow, the upper end of the second waterproofing sheet is prevented from peeling off together with the tapered member.

[0013] The third embodiment is the roof waterproofing structure according to the first embodiment, wherein the lower end of the tapered member is provided to cover the upper end of the second waterproofing sheet.

[0014] In the third embodiment of the roof waterproofing structure, the lower end of the tapered member covers the upper end of the second waterproofing sheet, further reducing the peeling force generated at the upper end of the second waterproofing sheet.

[0015] The fourth embodiment is a roof waterproofing structure according to any one of the first to third embodiments, wherein the first waterproofing sheet constitutes a membrane roofing material with its lower end fastened to a fastening device, and the second waterproofing sheet covers the fastening device and is adhered to the second waterproofing sheet.

[0016] In the roof waterproof structure of the fourth aspect, the peeling force generated at the joint part of the upper end of the second waterproof sheet due to the rainwater flow flowing through the first waterproof sheet constituting the membrane roof material is reduced by the tapered member. Therefore, the second waterproof sheet is less likely to peel off, and the durability is improved.

Advantages of the Invention

[0017] According to the present invention, it is possible to reduce the peeling force generated at the stepped portion of the joint part of the upper end of the second waterproof sheet due to the rainwater flow flowing through the first waterproof sheet constituting the roof surface.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view of a dome stadium with a membrane roof structure. [Figure 2] It is a cross-sectional structure of the fastening part at the lower end of the membrane roof material constituting the membrane roof to which the roof waterproof structure is applied. [Figure 3] (A) is a cross-sectional view along the vertical direction of the roof waterproof structure of the first embodiment, and (B) is a plan view. [Figure 4] (A) is a cross-sectional view along the vertical direction of the roof waterproof structure of the second embodiment, and (B) is a plan view. [Figure 5] (A) is a cross-sectional view along the vertical direction of the roof waterproof structure of the second embodiment, and (B) is a plan view. [Figure 6] It is another example of the roof waterproof structure.

Modes for Carrying Out the Invention

[0019] <First Embodiment> The roof waterproof structure according to the first embodiment of the present invention will be described with reference to the drawings.

[0020] Furthermore, each drawing is only a schematic representation. The dimensions and proportions of the elements shown in the drawings may not necessarily match those of reality. Also, the dimensions, proportions, and number of elements may not necessarily match between multiple drawings. In addition, in this embodiment, explanations of configurations not directly related to the present invention and well-known configurations may be omitted or simplified. The same applies to the second and third embodiments.

[0021] [Overall structure] First, I will explain the overall structure of a building to which a roof waterproofing structure has been applied.

[0022] As shown in Figure 1, in this embodiment, the roof waterproofing structure 100 is applied to the air-membrane structure type membrane roof 20 of the dome stadium 10. The roof waterproofing structure 100 can be applied to both new construction and renovation projects.

[0023] The dome stadium 10 is constructed with the aforementioned membrane roof 20 and an outer perimeter 12 in which stands and the like are provided. In this embodiment, the membrane roof 20 is composed of multiple membrane roofing materials 110 (see also Figures 2 and 3). The membrane roofing material 110 is an example of the first waterproof sheet that constitutes the roof surface 21 of the membrane roof 20.

[0024] As shown in Figure 2, the sheet-like membrane roofing material 110 constituting the membrane roof 20 (see also Figure 1), which is an example of a roof in this embodiment, has its lower end 112 fastened and fixed to the upper end 14 (see also Figure 1) of the reinforced concrete structure on the outer perimeter 12 (see also Figure 1) by a fastening device 50. The roof waterproofing structure 100 is applied to the portion where the lower end 112 of the sheet-like membrane roofing material 110 constituting the membrane roof 20 is fastened and fixed to the upper end 14 of the outer perimeter 12 by the fastening device 50 (see also Figure 1).

[0025] Next, the configuration of the fastening device 50 will be described. Note that the configuration of the fastening device 50 is just one example and may be any configuration.

[0026] The fastening device 50 is composed of an anchor bolt 52, a base fitting 54, an upper fastening fitting 56, a lower fastening fitting 58, a fixing rope 60, a rubber cover 62, a lower rubber sheet 64, and an upper rubber sheet 66.

[0027] The base fitting 54 is provided on the upper surface of the upper end portion 14 of the outer circumference 12. The lower fastening fitting 58 is a plate-shaped fitting, and the upper fastening fitting 56 is a fitting with a U-shaped cross-section. These lower fastening fittings 58 and upper fastening fittings 56 are provided on top of the base fitting 54 and are fixed by anchor bolts 52 and nuts 53 embedded in the upper end portion 14.

[0028] A lower rubber sheet 64 is sandwiched between the lower fastening fitting 58 and the base fitting 54. Between the lower fastening fitting 58 and the upper fastening fitting 56, an upper rubber sheet 66, the folded portion of the lower end 112 of the membrane roofing material 110 (described later), and one end 61 of the rubber cover 62 (described later) are sandwiched. The upper rubber sheet 66, the lower end 112 of the membrane roofing material 110, and one end 61 of the rubber cover 62 are stacked in that order from the bottom.

[0029] The anchor bolt 52 penetrates the lower fastening hardware 58, the base hardware 54, the lower rubber sheet 64, the upper rubber sheet 66, the lower end portion 112 of the membrane roofing material 110, and one end portion 61 of the rubber cover 62.

[0030] The anchoring rope 60 is positioned outside the upper fastening fitting 56, and the lower end portion 112 of the membrane roofing material 110 is wrapped around it and folded back. The rubber cover 62 is provided to cover the outside of the upper fastening fitting 56 and the anchoring rope 60, and as described above, one end 61 is sandwiched between the lower fastening fitting 58 and the upper fastening fitting 56.

[0031] The lower end 112 of the membrane roofing material 110 is fastened and secured to the upper end 14 of the outer periphery 12 by the fastening device 50 with this configuration.

[0032] [Roof waterproofing structure] Next, we will describe the roof waterproofing structure 100 of this embodiment, which is applied to the portion where the lower end portion 112 of the membrane roofing material 110 constituting the roof surface 21 of the membrane roof 20 shown in Figure 2 (see also Figure 1) is fastened with a fastening device 50.

[0033] As shown in Figures 2, 3(A), and 3(B), the roof waterproofing structure 100 is composed of a membrane roofing material 110 as an example of a first waterproofing sheet, a waterproofing sheet 120 as an example of a second waterproofing sheet, and a tapered member 150. In this embodiment, a water-stopping material 104 is filled into the triangular space formed by the membrane roofing material 110, the waterproofing sheet 120, and the upper fastening hardware 56.

[0034] Furthermore, the membrane roofing material 110 in this embodiment is composed of a sheet material with a thickness of approximately 0.8 mm, in which a glass fiber woven fabric is sandwiched between fluororesin coatings. The waterproof sheet 120 is composed of a sheet material with a thickness of approximately 1.2 mm, made of ethylene propylene rubber (EPDM), and is bonded to the membrane roofing material 110 and the fastening device 50 with adhesive. Note that the materials and sheet thicknesses of the membrane roofing material 110 and the waterproof sheet 120 are examples only and are not limited to these.

[0035] As shown in Figures 3(A) and 3(B), the tapered member 150 is a member with a right-angled triangular cross-section and is provided at the stepped portion 102 at the joint between the upper end 122 of the waterproof sheet 120 and the lower end 112 of the membrane roofing material 110. The tapered member 150 is provided over the entire area of ​​the stepped portion 102 (see Figure 3(B)).

[0036] Furthermore, the surface forming the hypotenuse of the right triangle in the tapered member 150 is defined as the top surface 152, the surface forming one adjacent side is defined as the side surface 154, and the surface forming the other adjacent side is defined as the bottom surface 156.

[0037] As shown in Figure 3(A), the upper surface 152 of the tapered member 150 approaches the membrane roofing material 110 as it extends upward. The lower surface 156 of the tapered member 150 is bonded with adhesive to the lower end portion 112 of the membrane roofing material 110 at the stepped portion 102.

[0038] In this embodiment, the side surface 154 of the tapered member 150 is bonded with adhesive to the end surface 124 of the upper end 122 of the waterproof sheet 120 of the stepped portion 102, but it is also possible that it is not bonded and is merely in contact or in close proximity. In this embodiment, the height of the side surface 154 of the tapered member 150 is the same as or approximately the same as the thickness of the waterproof sheet 120, but the side surface 154 may be larger.

[0039] The tapered member 150 shown in Figures 3(A) and 3(B) is made of rubber-based material and plastic material, but is not limited to these. Furthermore, the tapered member 150 may be a pre-formed material molded elsewhere, an unformed material molded on-site like a caulking agent, or a combination of these. The same applies to the tapered member 250 of the third embodiment described later (see Figures 5(A) and 5(B)).

[0040] [Effect] Next, the operation of this embodiment will be described.

[0041] The tapered member 150 reduces the peeling force generated at the stepped portion 102 of the joint at the upper end 122 of the waterproof sheet 120 by the flow of rainwater flowing over the membrane roofing material 110 that constitutes the roof surface 21 of the membrane roof 20. As a result, the upper end 122 of the waterproof sheet 120 becomes less likely to peel off, improving its durability.

[0042] Furthermore, since the fastening device 50 is covered with a waterproof sheet 120, deterioration of the fastening device 50 due to rainwater is prevented or suppressed.

[0043] In this embodiment, the membrane roof 20 constitutes the roof of the dome stadium 10. The lower end portion 112 of the membrane roofing material 110 that makes up the membrane roof 20 is fastened to the fastening device 50. Therefore, the upper end portion 122 of the waterproof sheet 120 has no choice but to overlap the membrane roofing material 110, inevitably forming a step portion 102. In addition, the flow of rainwater flowing over the roof surface 21 of the large membrane roof 20 of the dome stadium 10 has a high flow velocity and strong force at the lower end portion 112.

[0044] Therefore, if a tapered member 150 is not provided at the stepped portion 102 where the lower end 112 of the membrane roofing material 110 and the upper end 122 of the waterproof sheet 120 meet, a large amount of water pressure will be applied to the stepped portion 102 over a long period of time, which may cause the waterproof sheet 120 to peel off from the upper end 122, making it impossible to ensure waterproof performance.

[0045] However, in this embodiment, since a tapered member 150 is provided on the stepped portion 102, the water pressure of rainwater flow does not directly act on the stepped portion 102. Therefore, the waterproof sheet 120 is less likely to peel off, and waterproof performance can be ensured over a long period of time.

[0046] <Second Embodiment> Next, a roof waterproofing structure according to a second embodiment of the present invention will be described with reference to the drawings.

[0047] Note that the only difference between this embodiment and the roof waterproofing structure 100 of the first embodiment is the installation position of the tapered member 150. Therefore, explanations other than the installation position of the tapered member 150 will be omitted or simplified.

[0048] [Roof waterproofing structure] In the roof waterproofing structure 200 of this embodiment shown in Figures 4(A) and 4(B), the side surface 154 of the lower end of the tapered member 150 is installed with a gap L between it and the end surface 124 of the upper end 122 of the waterproofing sheet 120. In this embodiment, the height of the side surface 154 of the tapered member 150 is greater than the thickness of the waterproofing sheet 120.

[0049] [Effect] Next, the operation of this embodiment will be described.

[0050] The tapered member 150 reduces the peeling force generated at the joint of the upper end 122 of the waterproof sheet 120 by the flow of rainwater through the membrane roofing material 110 that constitutes the roof surface 21 of the membrane roof 20. As a result, the upper end 122 of the waterproof sheet 120 becomes less likely to peel off, improving its durability.

[0051] Furthermore, there is a gap L between the end face 124 of the upper end 122 of the waterproof sheet 120 and the side surface 154 of the lower end of the tapered member 150, and they are not joined. Therefore, even if the tapered member 150 is peeled off by rainwater flow, the upper end 122 of the waterproof sheet 120 will not be peeled off together with the tapered member 150.

[0052] <Third Embodiment> Next, a roof waterproofing structure according to a third embodiment of the present invention will be described with reference to the drawings.

[0053] Note that the only difference between this embodiment and the roof waterproofing structure 100 of the first embodiment is the configuration of the tapered member. Therefore, explanations other than the configuration of the tapered member will be omitted or simplified.

[0054] [Roof waterproofing structure] In the roof waterproofing structure 300 of this embodiment shown in Figures 5(A) and 5(B), the tapered member 250 is provided at the stepped portion 102 at the joint between the upper end 122 of the waterproofing sheet 120 and the lower end 112 of the membrane roofing material 110. The tapered member 250 is provided over the entire area of ​​the stepped portion 102 (see Figure 5(B)).

[0055] As shown in Figure 5(A), the lower end 251 of the tapered member 250 is provided to cover the upper end 122 of the waterproof sheet 120 and is bonded to the upper end 122 and end face 124 with adhesive. The upper surface 252 of the tapered member 250 approaches the membrane roofing material 110 as it goes upwards. The bottom surface 256 of the tapered member 250 is bonded to the lower end 112 of the membrane roofing material 110 at the stepped portion 102 with adhesive.

[0056] [Effect] Next, the operation of this embodiment will be described.

[0057] The tapered member 250 reduces the peeling force generated at the joint portion of the upper end 122 of the waterproof sheet 120 by the flow of rainwater through the membrane roofing material 110 that constitutes the roof surface 21 of the membrane roof 20. As a result, the waterproof sheet 120 becomes less likely to peel off, and its durability is improved.

[0058] Furthermore, since the lower end portion 251 of the tapered member 250 covers the upper end portion 122 of the waterproof sheet 120, the peeling force generated at the upper end portion 122 of the waterproof sheet 120 is further reduced.

[0059] Furthermore, since the lower end portion 251 of the tapered member 250 covers the upper end portion 122 of the waterproof sheet 120, rainwater seeping into the upper end portion 122 of the waterproof sheet 120 through the gap is prevented or suppressed.

[0060] <Method for modifying fluororesin films> In the above embodiment, the membrane roofing material 110 is made of a sheet material in which glass fiber woven fabric is sandwiched between fluororesin coatings. The waterproof sheet 120 and tapered members 150 and 250 are bonded to the membrane roofing material 110, which has a fluororesin film on its surface.

[0061] However, fluororesin films are highly water-repellent and difficult to bond. Therefore, when bonding to a fluororesin film, a modification treatment is necessary to change the surface to a state where bonding is possible. Accordingly, the following describes an example of a method for modifying a fluororesin film.

[0062] • First example of modification The first example of modification is modification using fluoropolymer surface treatment agents such as Fluorobonder (registered trademark). Fluoropolymer surface treatment agents chemically extract fluorine atoms from the carbon chain of the fluoropolymer due to the halogen-hydrophilic nature of sodium atoms, making the carbon atoms hydrophilic by creating electron-deficient states such as double bonds, thus enabling adhesion.

[0063] • Second example of modification The second modification example involves a surface modification treatment system that utilizes combustion chemical vapor deposition (CCVD). This surface modification treatment system improves adhesion and bonding properties by spraying a combustion flame mixed with organic liquid metal onto the surface of a fluororesin film, thereby forming a highly hydrophilic silicon oxide film at the nanoscale.

[0064] <Other> Furthermore, the present invention is not limited to the embodiments described above.

[0065] The roof waterproofing structures 100, 200, and 300 of this embodiment were applied to the lower end portion 112 fastened to the fastening device 50 of the membrane roofing material 110 that constitutes the roof surface 21 of the membrane roof 20 of the dome stadium 10, but are not limited to this. For example, they may be applied to the roof waterproofing structure of membrane roofing material that constitutes the roof surface of a membrane roof other than a dome stadium, or to the roof waterproofing structure of a first waterproof sheet that constitutes the roof surface of a roof other than a membrane roof.

[0066] Examples other than membrane roofs include, for example, a structure in which tapered members 150 and 200 are provided at the stepped portion of the joint at the upper end of the second waterproof sheet 520 that covers the area around the waterproof penetration portion of the equipment foundation 602 of the equipment 600 in the first waterproof sheet 510 that constitutes the roof surface 502 of the sloped roof 500 shown in Figure 6. Alternatively, although not shown in the illustration, a structure in which tapered members 150 and 200 are provided at the stepped portion of the joint at the upper end of the second waterproof sheet 520 that has been applied for repair over a partially damaged area of ​​the first waterproof sheet 510.

[0067] Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. Multiple embodiments can be combined as appropriate. [Explanation of Symbols]

[0068] 20 Membrane roof 21 Roof surface 50 Tightening device 100 Roof waterproofing structure 102 Stepped section 110 Membrane roofing material (an example of a first waterproof sheet) 112 Lower end 120 Waterproof sheet (an example of a second waterproof sheet) 122 Upper end 150 Tapered member 151 Lower end 152 Top surface 200 Roof waterproofing structure 250 Tapered Member 251 Lower end 252 Top surface 300 Roof waterproofing structure 500 roof 502 Roof surface 510 First Waterproof Sheet 520 Second waterproof sheet

Claims

1. The first waterproof sheet that makes up the roof surface, A second waterproof sheet is adhered on top of the first waterproof sheet, A tapered member is provided at the stepped portion of the joint between the upper end of the second waterproof sheet and the first waterproof sheet, and whose upper surface approaches the second waterproof sheet as it goes upward, A roof waterproofing structure equipped with this feature.

2. There is a gap between the upper end of the second waterproof sheet and the lower end of the tapered member. The roof waterproofing structure according to claim 1.

3. The lower end of the tapered member is provided so as to cover the upper end of the second waterproof sheet. The roof waterproofing structure according to claim 1.

4. The first waterproof sheet constitutes a membrane roofing material whose lower end is fastened to a fastening device. The second waterproof sheet covers the fastening device and is adhered to the second waterproof sheet. A roof waterproofing structure according to any one of claims 1 to 3.

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