JP2015086550A - Fastener for fixing waterproof sheet, and waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener for fixing a waterproof sheet, which can prevent a screw body from being loosened and turned with respect to a substrate with repeated vibrations.SOLUTION: A screw body is screwed into a substrate B so that a coating layer 2 made of a material softer than a component for a thread 11a can be sandwiched between a screw hole Bh of a metal substrate B1 and the thread 11a of the screw body. Thus, even when vibrations are transmitted to the screw body from the substrate B by repeated wind pressure and the like, the screw body is fixed to the substrate B in such a manner as to be unrotatable in a direction of looseness.

Description

  The present invention is a waterproof sheet fixing fastener for fastening and fixing (screwing) a waterproof sheet laid on a base such as a metal base in a waterproof structure such as a roof of a building, a veranda, and a balcony, and It relates to a waterproof structure using the same.

As a sheet waterproofing method used for a building structure, a waterproof sheet mechanical fixing method may be used.
The mechanical fixing method of the waterproof sheet is a method in which a fixing disk is fixed to a base with a fastener such as a screw, and the waterproof sheet is fixed on the base with a fixing disk.
As a conventional technique using this mechanical fixing method, for example, there is a waterproof base structure comprising a combination of a fixing member such as a screw-in type screw screw and a waterproof sheet fixing tool corresponding to a fixing disk. A fixing member such as a screw screw has a pressing portion that contacts the waterproof sheet fixing bracket and fixes the waterproof sheet fixing bracket to the waterproof base. A covering layer is provided on the surface of the holding portion on the side of the waterproof sheet fixing bracket. The waterproof base includes a metal plate of the base body and a heat insulating material laid on the metal plate, and waterproof sheet fixing brackets are arranged on the heat insulating material at predetermined intervals. The waterproof sheet fixture has a mounting hole, a fixing member is screwed into the mounting hole, and the fixing bracket is mechanically fixed to the metal plate. A sheet adhesive layer that can be bonded to the waterproof sheet is provided on the surface of the waterproof sheet fixture, and a sheet adhesive layer made of resin or rubber that covers the surface of the waterproof sheet fixture, and covering of the pressing portion of the fixing member Make the layers bondable. Thereby, remarkable resistance is obtained against the detachment of the fixing member due to vibration of a fixed object such as a waterproof base. After fixing the waterproof sheet fixture to a predetermined position on the waterproof base with a fixing member, the waterproof sheet is adhered to the sheet adhesive layer of the waterproof sheet fixture, and the waterproof base is covered with the waterproof sheet (see, for example, Patent Document 1).

JP 2006-291567 A

In Patent Document 1 described above, a fixing member such as a screw screw is adhesively fixed to the sheet adhesive layer of the waterproof sheet fixture through a covering layer.
However, with respect to the metal plate of the waterproof base, only a fixing member such as a screw screw is mechanically fixed by screwing, and sufficient measures for preventing loosening are not taken. Therefore, if vibration is transmitted from the waterproof base metal plate to the fixing member due to repeated wind pressure, etc., even if the fixing member is fixed to the waterproof sheet fixture, the fixing member is loosened relative to the waterproof base metal plate. The fixing member may come loose from the metal plate of the waterproof base. In particular, when the metal sheet of the waterproof base is thin, the fixing member is more easily loosened due to vibration due to wind pressure. Furthermore, if the fixing member is loosened from the metal plate of the waterproof base, there is a problem that the waterproof sheet is vibrated to break the waterproof sheet and cause water leakage.

  An object of the present invention is to provide a fastener for fixing a waterproof sheet that can prevent such a problem that a screw main body loosens and rotates with respect to a base with repeated vibrations. An object of the present invention is to provide a waterproof structure capable of preventing the waterproof sheet from being damaged by the movement of the fixture by preventing loose rotation of the screw main body with respect to the ground due to repeated vibration.

  In order to achieve such an object, a waterproof sheet fixing fastener according to the present invention is a waterproof sheet fixing fastener that is fastened and fixed to the base for laying and fixing the waterproof sheet on the base. And a coating layer provided so as to cover the valley portion of the screw thread, and the coating layer is made of a material softer than the constituent material of the screw thread. The screw body is screwed into the base so that the covering layer is sandwiched between the screw hole of the base and the screw thread.

  Further, the waterproof structure according to the present invention includes a waterproof sheet laid on a base, a fixture attached to the base and fixing the waterproof sheet to the base, and a waterproof sheet inserted from the fixture toward the base A fixing fastener, and the waterproof sheet fixing fastener includes a helical thread provided on a screw portion of a screw body, and a coating layer provided so as to cover a valley portion of the screw thread, And the covering layer is made of a material softer than the constituent material of the screw thread, and the screw body is screwed into the base so that the covering is formed between the screw hole of the base and the screw thread. The layer is formed so as to be sandwiched.

The fastener for fixing a waterproof sheet according to the present invention having the above-described characteristics is softer than the constituent material of the screw thread between the screw hole of the metal base and the screw thread of the screw main body by screwing the screw main body into the base. A covering layer made of a new material is sandwiched. Thereby, even if vibration is transmitted from the base to the screw main body due to repeated wind pressure or the like, the screw main body is fixed to the base so as not to rotate in the loosening direction.
Therefore, it is possible to prevent the screw main body from loosening and rotating with respect to the base with repeated vibrations.
As a result, compared to conventional products that do not have sufficient anti-loosening measures simply by screwing screws and other fasteners onto the metal plate of the waterproof substrate, it is possible to remove it from the substrate by repeated wind pressure. Even if vibration is transmitted to the screw main body, the screw main body does not come loose from the base, and safety is improved, and the waterproof sheet can be fastened and fixed (screwed) to the base for a long period of time.

In the waterproof structure according to the present invention having the above-described features, the coating layer is formed between the screw hole of the metal base and the screw thread of the screw main body by screwing the screw main body of the waterproof sheet fixing fastener into the base. Even if vibration is transmitted from the base to the screw body due to repeated wind pressure, etc., the screw body is fixed to the base so that it cannot rotate in the loosening direction, and at the same time, the fixture cannot be moved (cannot be displaced). Fixed.
Therefore, it is possible to prevent loose rotation of the screw main body with respect to the ground due to repeated vibrations and prevent damage to the waterproof sheet due to movement of the fixture.
As a result, it is not possible to take sufficient measures to prevent loosening by simply screwing a fixing device such as a screw screw into the waterproof metal plate, and the fixing device vibrates together with the waterproof sheet fixing device. Even if vibration is transmitted from the base to the screw body due to repeated wind pressure, etc., the screw body does not loosen and come off from the base, making it impossible to move the fixture (displacement). Since it keeps fixing, safety | security improves and generation | occurrence | production of the water leak accident by damage of a waterproof sheet can also be prevented over a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the whole structure of the waterproof sheet fixing fastener and waterproof structure which concern on embodiment of this invention, (a) is a longitudinal front view of a waterproof structure, (b) is an expansion front of the fastener for waterproof sheet fixing FIG. 4C is a longitudinal front view showing the main part further enlarged. It is a vertical front view which shows the whole structure of the waterproof structure which concerns on the other Example of this invention. It is a vertical front view which shows the whole structure of the waterproof structure which concerns on the other Example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The waterproof sheet fixing fastener A according to the embodiment of the present invention is a fixing screw or the like that is screwed and fixed to the base B in order to lay and fix the waterproof sheet C on the base B such as a metal base. .
More specifically, as shown in FIGS. 1 to 3, the waterproof sheet fixing fastener A includes a spiral thread 11a provided on the screw portion 11 of the screw body 1 and a valley portion 11r of the thread 11a. And a covering layer 2 provided so as to cover the surface as a main component.
The waterproof structure using the waterproof sheet fixing fastener A includes a waterproof sheet C laid on the base B, and a fixture for fixing the waterproof sheet C to the base B attached to the base B. D and a waterproof sheet fixing fastener A inserted from the fixing tool D toward the base B are provided as main components.

The screw main body 1 of the waterproof sheet fixing fastener A may be anything that can fasten (fix) the fixing tool D to the base B, which will be described later, as shown in FIGS. . As a constituent material of the screw main body 1, steel materials such as carbon steel, alloy steel, and stainless steel can be used.
More specifically, the screw main body 1 has a screw portion 11 in which a screw thread 11 a is engraved in a spiral shape, and a head portion 12 formed at the base end of the screw portion 11. The screw thread 11a includes a spiral apex portion 11t and a trough portion 11r formed between the apex portions 11t adjacent in the axial direction. As shown in FIG.1 (c), the length from the trough part 11r of the thread 11a to the top part 11t is made into the height dimension H1.
Furthermore, although the shape of the screw body 1 is not particularly limited, the shape of the head 12 is more preferably a dish, a flat, a pan, or the like so that the head 12 does not protrude from the surface (upper surface) of the fixture D described later. The shape of a groove (not shown) that engages with a tool such as a screwdriver or a wrench formed on the top surface of the head 12 is preferably a cross hole, a hexagonal hole, a square hole, or the like.

As a specific example of the screw body 1, as shown in FIGS. 1A and 1B, a cylindrical portion 13 in which a screw thread 11 a is not engraved between the screw portion 11 and the head portion 12, and the screw portion 11. The case where it is the screw screw which integrally formed the screw tip part 14 sharp at the front-end | tip is shown.
The screw tip portion 14 is a self-unit in which a drill portion 14a is integrally formed so that a screw hole Bh is formed in the base B by screwing the screw body 1 without providing a pilot hole in the base B, which will be described later. It is preferable to use a drill screw.
Although not shown in the drawings as another example, it is possible to change the configuration so as not to have the cylindrical portion 13 or the pointed screw tip portion 14.

The covering layer 2 is made of a material softer than a material such as a metal constituting the screw thread 11a of the screw part 11, such as a synthetic resin, and the screw part 11 has a valley part 11r excluding the top part 11t of the screw thread 11a. Laminates are formed so that most of them are covered. That is, the covering layer 2 has the screw valley covering portion 2a laminated on the valley portion 11r of the screw thread 11a.
In the coating layer 2, the screw valley covering portion 2 a is partially removed by screwing the screw body 1 into the base B to partially abut against the screw hole Bh of the base B, and the remaining screw valley covering portion 2 a ′ By being compressed with the screw hole Bh of the base B, it is configured to be sandwiched between the screw hole Bh.
The covering layer 2 is not limited to the screw valley covering portion 2a stacked on the valley portion 11r of the screw thread 11a, and the covering layer 2 is stacked so that substantially the entire surface of the screw body 1 including the head 12 is covered. It is also possible to form. However, it is preferable not to form the coating layer 2 on the top surfaces of the screw tip portion 14 and the head portion 12. When the coating layer 2 is laminated and formed on the drill portion integrally formed with the screw tip portion 14, when the screw hole Bh is opened in the base B described later, or the coating layer 2 is peeled off Can be considered. When the coating layer 2 is laminated on the top surface of the head portion 12, a groove that engages with the tool is filled with the coating layer 2, and the tool cannot be sufficiently engaged.

Further, when the coating layer 2 is formed so as to rise from the screw thread 11a and protrude in the radial direction at the screw portion 11, when the screw body 1 is screwed into the base B described later, It is also conceivable that the covering layer 2 is peeled off as a whole, not limited to the portion that abuts against the base B.
Therefore, the thickness H2 of the screw valley covering portion 2a in the coating layer 2 is equivalent to the height dimension H1 of the screw thread 11a (the length from the valley portion 11r to the top portion 11t) as shown in FIG. It is preferable to set the following. That is, it is preferable to set the volume of the covering layer 2 to be equal to or less than the volume of the thread valley formed between the adjacent threads 11a in the axial direction.
In the example shown in FIG. 1C, the thickness H2 of the covering layer 2 is laminated so as to be shallower than the height dimension H1 of the thread 11a.
In addition, the thread valley covering portion 2a of the covering layer 2 has a thickness that bites between the screw thread 11a of the screw main body 1 and the screw hole Bh of the base B as the screw main body 1 is screwed into the base B. By forming, it is preferable that a slight gap between the screw thread 11 a and the screw hole Bh of the base B is filled with the coating layer 2.

Since the soft material constituting the covering layer 2 needs to be laminated so as to be filled along the valley portion 11r of the thread 11a, a material having excellent adhesion to the surface of the thread 11a is preferable. Therefore, the coating layer 2 is preferably formed of a synthetic resin.
Specific examples of the constituent material of the coating layer 2 include thermoplastic elastomers such as polyvinyl chloride, acrylic, polyolefin, polyester, and thermoplastic polyurethane elastomers, polystyrene, and other thermoplastic resins, epoxy, and butadiene rubber. A rubber such as chloroprene rubber, SBR, NBR, acrylic rubber, urethane rubber, or silicone rubber can be used. Furthermore, since the coating layer 2 is likely to bite between the screw holes Bh of the base B and easily exhibits a loosening prevention effect, a soft synthetic resin having elasticity is preferable, such as polyvinyl chloride, acrylic, urethane, A modified silicone type or the like is preferable. Further, these resins may be mixed and kneaded.
In particular, it is preferable to use a polyvinyl chloride resin as a constituent material of the covering layer 2 in that it can be easily laminated on the thread 11a of the screw body 1. Here, a plasticizer and a filler can be added to the polyvinyl chloride resin.
A polyvinyl chloride resin having a polymerization degree of 600 to 3000 can be used. Furthermore, when dipping and using as a polyvinyl chloride resin sol, the polymerization degree of the polyvinyl chloride resin is preferably 1500 to 3000, and more preferably 1800 to 3000. Examples of the plasticizer include phthalic acid plasticizers such as diisononyl phthalate, di- (2-ethylhexyl) phthalate, diisodecyl phthalate, and butyl benzyl phthalate, tributyl phosphate, tri- (2-ethylhexyl) phosphate, 2-ethylhexyl diphenyl phosphate, and the like. Phosphate ester plasticizers, epoxy plasticizers such as epoxidized soybean oil, polyester plasticizers, di- (2-ethylhexyl) adipate, di-n-decyl adipate, di- (2-ethylhexyl) azelate, dibutyl seba Fatty acid ester plasticizers such as keto and di- (2-ethylhexyl) sebacate, trimellitate plasticizers, pyromellitate plasticizers, benzoic acid plasticizers, and sulfonate ester plasticizers can be used. Moreover, the addition amount of a plasticizer can be 30 parts-200 parts with respect to 100 weight part of polyvinyl chloride resin, 50 parts-150 parts are more preferable, and 60-100 parts are further more preferable. As the filler, calcium carbonate, silica, talc, kaolin, mica and the like can be added, preferably 1 to 200 parts, more preferably 1 to 100 parts, based on 100 parts by weight of the polyvinyl chloride resin. More preferred is 50 parts. Moreover, you may add a stabilizer, a ultraviolet absorber, a light stabilizer, surfactant, an antibacterial agent, antioxidant, a defoaming agent, a thixotropic agent etc. as an additive.

Furthermore, as a method of laminating and forming the coating layer 2 on the screw thread 11a of the screw body 1, a liquid synthetic resin can be applied to the screw body 1 and solidified by heat or light. The screw body 1 can be immersed in a liquid synthetic resin and solidified by heat, light, or the like. As the liquid synthetic resin, a synthetic resin dissolved in a solvent, a synthetic resin mixed with a plasticizer, or the like is used. A dipping process using a sol obtained by adding a plasticizer to a polyvinyl chloride resin is preferable because the viscosity can be easily adjusted and the processing operation range is wide, so that the coating layer 2 can be easily formed. In particular, the thermoplastic resin may be heated to a molten state and then applied to the thread 11 a of the screw body 1. Further, the coating layer 2 may be provided by winding a tape-shaped synthetic resin around the screw thread 11a of the screw body 1, but in view of the ease of forming the coating layer 2, a liquid synthetic resin is preferable. .
Before the coating layer 2 is laminated and formed on the screw thread 11a of the screw body 1, the screw body 1 may be subjected to a primer treatment. Thereby, the adhesiveness of the coating layer 2 to the screw body 1 is improved, the coating layer 2 is easily laminated, and the coating layer 2 is detached when the screw body 1 is screwed into the base B ( It becomes difficult to peel off. The primer may be selected depending on the combination of the screw main body 1 and the coating layer 2, but acrylic, urethane, epoxy, or the like can be used. When stainless steel is used as the screw body 1 and a polyvinyl chloride resin sol is used as the coating layer 2, the adhesion between the thread 11 a of the screw body 1 and the coating layer 2 is improved by using an acrylic primer.

Further, in the dipping process using the polyvinyl chloride resin sol, the screw body 1 is made of the polyvinyl chloride resin so that the polyvinyl chloride resin layer as the coating layer 2 is not formed so as to rise from the thread 11a of the screw body 1. When it is pulled up after being immersed in the sol, it may be heated after passing through a step of dropping excess polyvinyl chloride resin sol by applying vibration, rotation, scraping or the like.
Alternatively, the screw body 1 can be immersed in the polyvinyl chloride resin sol after masking the surface of the screw tip 14 or the head 12. Further, even when a method other than the dipping process using the polyvinyl chloride resin sol is used, a process of removing excess resin or masking may be similarly performed.

On the other hand, as the base B, a metal base B1 such as a folded-plate roof, a tile roof, or a deck plate can be used. In the base B, a screw hole Bh that is screwed with the screw portion 11 (thread 11a) of the screw body 1 is formed. The screw hole Bh is drilled when the screw body 1 is screwed or a screw hole Bh having an inner diameter smaller than the outer diameter of the screw body 1 is opened before the screw body 1 is screwed. It may be drilled when screwing.
As a specific example of the metal base B1, as shown in FIG. 1A, a metal folded plate roof B11 is used, and a screw hole Bh is drilled at a predetermined position. If necessary, a heat insulating material B2 or a non-combustible plate (not shown) can be further laid and used on the metal folded plate roof B11.
As the heat insulating material B2, a polystyrene foam, a rigid urethane foam, a phenol foam, a polyolefin foam such as polyethylene, polypropylene, or the like can be used. Considering the strength, a heat insulating material in which kraft paper or aluminum foil is laminated on both sides is preferable. Moreover, when it is necessary to take a gradient, a thermal insulation board with a gradient can be used.
The non-combustible plate is laid on the heat insulating material B2, and has a purpose of preventing the heat insulating material B2 from sinking and deforming by installing a heavy structure (not shown) at the time of construction or subsequent inspection. . Therefore, it is preferable to use an inorganic plate, a metal plate, a steel plate or the like as the incombustible plate.
Although not shown in the drawings as other examples, a buffer sheet or the like can be laid as the base B depending on the purpose in addition to these configurations.

As the waterproof sheet C, a vulcanized rubber sheet, a non-vulcanized rubber sheet, a waterproof sheet made of a thermoplastic resin, a waterproof sheet made of other synthetic resin, or the like can be used.
Further, the waterproof sheet C may be a single layer, but a multilayer product in which base layers such as glass cloth and nonwoven fabric are laminated is preferable from the viewpoint of excellent dimensional stability and tensile strength. This base material layer is preferably provided so as to be sandwiched between intermediate positions of the thermoplastic resin layer, but may be provided in the lowermost layer.
Further, in the example shown in FIG. 1A, the waterproof sheet C is disposed on the fixture D described later, but is not limited to such an aspect, and may be disposed below the fixture D. .
As a specific example of the waterproof sheet C, a polyvinyl chloride resin waterproof sheet, which is a thermoplastic resin waterproof sheet, can be used. As a material of the waterproof sheet C made of thermoplastic resin, a thermoplastic resin such as polyvinyl chloride resin, polyolefin resin, or acrylic resin can be used. In particular, it is preferable to use a waterproof sheet made of polyvinyl chloride resin.
As another example, as the waterproof sheet C, a waterproof sheet made of vulcanized rubber or the like can be used.

The fixture D is made of a rigid material such as metal, hard synthetic resin, or wood, and is formed in a circular or elliptical plate shape (disk shape), a square, rectangular or rectangular plate shape, or a long belt-like plate shape. It is preferable that a plurality of bases B are arranged in a dispersed manner.
As a constituent material of the fixture D, it is preferable to form it with metal from the viewpoint of strength and durability, and particularly high humidity such as stainless steel, steel plate subjected to rust prevention treatment such as zinc, aluminum, magnesium plating or galvanization. A steel plate which does not easily rust even in a state is preferable.
Furthermore, the fixture D preferably has an attachment hole D1 through which the screw body 1 is inserted. A required number of mounting holes D1 are opened at predetermined positions of the fixture D, and the head 12 of the screw body 1 is rotatably locked to support the base B so that it can be screwed into the metal base B1.
Further, it is preferable to coat and form the adhesive layer D2 made of a synthetic resin on the surface (upper surface) of the fixture D. When the waterproof sheet C is a waterproof sheet made of a thermoplastic resin, thermal fusion or solvent welding is performed. Therefore, it is preferable to form the adhesive layer D2 with a thermoplastic resin. More preferably, the adhesive layer D2 of the fixture D and the waterproof sheet C are made of the same type of resin composition. For example, if the waterproof sheet C is a polyvinyl chloride resin, the adhesive layer D2 of the fixture D is also It is preferable to use a polyvinyl chloride resin system. Thereby, heat fusion and solvent welding can be easily performed and the bonding strength is further improved.

According to such a waterproof sheet fixing fastener A according to the embodiment of the present invention, by screwing the screw body 1 into the metal base B1 of the base B, the screw hole Bh provided in the metal base B1 and the screw main body 1 The screw valley covering portion 2a ′ of the covering layer 2 made of a material softer than the constituent material of the screw thread 11a is sandwiched between the screw thread 11a. Thereby, even if vibration is transmitted from the metal base B1 of the base B to the screw main body 1 due to repeated wind pressure or the like, the screw main body 1 is fixed to the base B so as not to rotate in the loosening direction.
Therefore, it is possible to prevent the screw body 1 from loosening and rotating with respect to the base B due to repeated vibration.
As a result, even if vibration is transmitted from the base B to the screw main body 1 due to repeated wind pressure or the like, the screw main body 1 does not come off from the base B, and safety is improved. Fastened and fixed (screwed) to the base B.

In particular, when the coating layer 2 has a thickness H2 shallower than the height dimension H1 of the screw thread 11a, the valley part 11r excluding the top part 11t of the screw thread 11a is covered with the coating layer 2, and the screw thread Even if the screw body 1 is screwed into the base B and the top part 11t of the screw thread 11a and the screw hole Bh of the base B are screwed together, the screw in the screw hole Bh of the base B is exposed. Although a part of the coating layer 2 is peeled off by the peak portion Bh1, the coating layer 2 is not peeled as a whole from the thread 11a. A part of the coating layer 2 remaining without being peeled is in a state of being in close contact with the base B while being compressed and deformed as the coating layer 2 (screw valley coating portion 2a ′).
Therefore, it is possible to prevent the entire peeling of the coating layer 2 when the screw body 1 is screwed.
As a result, loosening of the screw body 1 can be reliably prevented.

Further, when the coating layer 2 is formed with a thickness that bites between the screw thread 11a and the screw hole Bh of the base B as the screw body 1 is screwed into the base B, When the screw body 1 is screwed in, the coating layer 2 bites between the screw thread 11a and the screw hole Bh of the base B, so that a slight gap between the screw thread 11a of the screw main body 1 and the screw hole Bh of the base B is obtained. A gap is filled with the coating layer 2. Thereby, even if vibration is transmitted from the base B to the screw body 1 due to repeated wind pressure or the like, the screw body 1 does not rotate backward in the loosening direction.
Therefore, the loosening prevention effect of the screw body 1 with respect to the screw hole Bh of the base B can be improved.
As a result, loosening of the screw body 1 can be prevented more reliably.

Then, according to the waterproof structure using the waterproof sheet fixing fastener A according to the embodiment of the present invention, the screw body 1 of the waterproof sheet fixing fastener A is screwed into the base B, thereby screwing the metal base B1. Even if the screw valley covering portion 2a 'of the coating layer 2 is sandwiched between the hole Bh and the screw thread 11a of the screw body 1, and vibration is transmitted from the base B to the screw main body 1 due to repeated wind pressure or the like, the base B On the other hand, the screw body 1 is fixed so as not to rotate in the loosening direction, and at the same time, the fixture D is fixed so as not to be movable (displacement is impossible).
Therefore, loose rotation of the screw body 1 with respect to the base B due to repeated vibrations can be prevented, and damage to the waterproof sheet C due to the movement of the fixture D can be prevented.
As a result, even if vibration is transmitted from the base B to the screw body 1 due to repeated wind pressure or the like, the screw body 1 does not come loose from the base B and the fixture D is fixed so that it cannot be moved (cannot be displaced). Accordingly, the waterproof sheet C does not move (vibrates) due to the vibration caused by the wind pressure, and the occurrence of a water leakage accident due to the damage of the waterproof sheet C can be prevented over a long period of time.

Further, when the thickness of the base B is formed to be smaller than the pitch of the screw threads 11a in the screw body 1, when the screw thread 11a rotates and moves the base B as the screw body 1 is screwed, the coating layer 2 (screw valley covering portion 2a ′), the end of the screw hole Bh of the base B bites into the cover layer 2 (screw valley covering) between the valley portion 11r of the screw thread 11a and the end of the screw hole Bh of the base B. The screw body 1 is fixed to the base B with the portion 2a ′) sandwiched therebetween. Thereby, even if vibration is transmitted from the base B to the screw body 1 due to repeated wind pressure or the like, the screw body 1 does not rotate backward in the loosening direction.
Therefore, even when the base B is thin, the effect of preventing the loosening of the screw body 1 with respect to the screw hole Bh of the base B can be improved.
As a result, if the metal sheet of the waterproof base is thin, the fixing member can be more easily loosened due to vibration due to wind pressure, etc., and safety can be further improved, and the waterproof sheet C can be damaged for a long time. Can be prevented.

Next, each embodiment of the present invention will be described with reference to the drawings.
In the first embodiment, as shown in FIGS. 1A, 1B and 1C, a folded plate roof B11 is used as the metal substrate B1 of the substrate B, and a heat insulating material B2 is laid on the folded plate roof B11. ing. A disk-shaped fixing disk is disposed on the heat insulating material B2 as a fixture D, and the screw body 1 penetrates the heat insulating material B2 from the mounting hole D1 opened at the center of the fixing disk, and is folded. The waterproof sheet C is laid and fixed to the base B by being screwed into the convex portion B11a of the roof B11.
A waterproofing sheet C1 made of polyvinyl chloride resin is laid as a waterproofing sheet C so as to cover the fixing disk serving as the fixing tool D, the top surface of the head 12 of the screw body 1, and the surface of the heat insulating material B2. An adhesive layer D2 made of a thermoplastic resin such as polyvinyl chloride resin is formed on the surface (upper surface) of the fixing disk serving as the fixture D, and the adhesive layer D2 and The back surface of the waterproof sheet C1 is bonded. Thereby, the waterproof sheet C1 made of polyvinyl chloride resin, which becomes the waterproof sheet C, is fixed to the folded plate roof B11 of the metal base B1.

As the screw body 1, a self-drilling screw in which a drill part 14a is integrally formed with the screw tip part 14 is used. By rotating the screw body 1 with a tool such as a driver (impact driver) or a wrench, the heat insulating material B2 is penetrated. It advances toward the folded plate roof B11 of the metal base B1, and is tightened while making a screw hole Bh in the folded plate roof B11.
The valley portion 11r of the thread 11a in the screw body 1 is covered with a polyvinyl chloride resin-based coating layer 2. As a component of the coating layer 2, 90 parts by weight of a plasticizer is added to 100 parts by weight of a polyvinyl chloride resin (polymerization degree 1800), and further a Ca-Zn stabilizer, 20 parts by weight of a filler, and titanium oxide as a pigment. And the carbon rack was mix | blended, this resin composition was stirred with the mixer, and the polyvinyl chloride sol was obtained. The screw body 1 is immersed in this polyvinyl chloride sol, and excess polyvinyl chloride sol is screened off and then heated in an oven at 200 ° C., and a coating layer 2 made of polyvinyl chloride resin is laminated along the thread 11a. Yes.
In the coating layer 2, the screw valley covering portion 2a is partially removed by screwing the screw body 1 into the base B to partially abut against the screw hole Bh of the base B, but the remaining screw valley covering portion 2a ' By being compressed between the screw hole Bh of the base B, the screw hole Bh and the valley portion 11r are sandwiched so as to be tightly contracted without a gap.

According to the waterproof structure according to the first embodiment of the present invention, the screw main body 1 of the waterproof sheet fixing fastener A can be sufficiently fixed to the metal base B1 of the base B with a small amount of work, and Waterproofness is also improved. Therefore, it is possible to improve the fixing strength and waterproofness while maintaining the workability.
Furthermore, corrosion of the screw body 1 due to condensation can be prevented.

Here, using the screw body 1 (self-drilling screw) of the waterproof sheet fixing fastener A according to Example 1 of the present invention, a vibration test on the looseness of the screw body 1 with respect to the metal base B1 of the base B is performed, and the evaluation The results are shown in Table 1.
In Example 1 and Comparative Example 1-2 shown in Table 1, a self-drilling screw having a diameter of 7.0 mm, a total length of 75 mm, and a thread pitch of 2.5 mm is screwed in and fixed to a 0.8 mm metal base B1 (folded plate roof B11). The point which I did is common.
As described above, the polyvinyl chloride resin-based coating layer 2 is laminated on the self-drilling screw of Example 1.
Comparative Example 1-2 is common in that a self-drilling screw in which the coating layer 2 is not laminated is used.
Furthermore, the comparative example 2 is different from the comparative example 1 in that a metal base B1 (folded plate roof B11) reinforced with a 0.8 mm galvanized steel sheet through a 1 mm butyl tape is used.
As a vibration test, Example 1 and Comparative Example 1-2 are common, and a belt sander is applied to the side surface of the folded plate roof B11 to give vibration for 1 minute. The looseness of the self-drilling screw was visually confirmed from the hole Bh.
The evaluation results of Example 1 and Comparative Example 1-2 shown in Table 1 are based on the following indices.
“No loose screw” was evaluated as “Good”, “One loose screw” was evaluated as “△”, and “Two or more loose screws” was evaluated as “Poor”.

  When Example 1 and Comparative Example 1-2 are compared, Example 1 does not cause loosening of screws and a good evaluation result is obtained, whereas Comparative Example 1-2 shows loosening of screws. Has occurred, resulting in a poor evaluation result.

As shown in FIG. 2, the second embodiment uses a tile rod roof B12 and a structural frame B13 that supports the tile rod roof B12 as the metal substrate B1 of the substrate B, and a plurality of convex portions formed on the tile rod roof B12. The heat insulating material B2 is laid in the concave space B12b between B12a. A fixing disk is disposed as a fixture D on the projection B12a of the tile rod roof B12 and the heat insulating material B2, and the screw body 1 passes through the projection B12a of the tile rod roof B12 through the fixing hole D1. Then, the structure in which the waterproof sheet C1 made of polyvinyl chloride resin that becomes the waterproof sheet C is laid and fixed to the base B by being screwed into the structural housing B13 is different from the example 1 shown in FIG. The configuration is the same as that of the first embodiment shown in FIG.
Accordingly, the waterproof structure according to the second embodiment of the present invention can provide the same operation and effect as the first embodiment.

  In Example 3, as shown in FIG. 3, a waterproof sheet C1 made of polyvinyl chloride resin is laid as a waterproof sheet C on the heat insulating material B2, and a disk-shaped fixture D is formed on the waterproof sheet C1. A fixed disk is placed. The screw body 1 passes through the heat insulating material B2 from the fixing hole D1 of the fixing disk and is screwed into the convex portion B11a of the folded plate roof B11, and the fixing disk serving as the fixture D and the top of the head 12 of the screw body 1 FIG. 1 shows a configuration in which an additional tension sheet C2 serving as the waterproof sheet C is laid and fixed to the base B by laying the additional tension sheet C2 as the waterproof sheet C so as to cover the surface and the surface of the waterproof sheet C1. Unlike the first embodiment, the other configuration is the same as that of the first embodiment shown in FIG.

As the material of the reinforcing sheet C2, a synthetic resin that is the same as or similar to the waterproof sheet C1 and easily welded is preferable, and a polyvinyl chloride resin, an olefin resin, and an acrylic resin are preferable. In particular, when a waterproof sheet C1 made of polyvinyl chloride resin is provided, it is preferable to use an additional sheet C2 made of polyvinyl chloride resin. The thickness of the reinforce sheet C2 is preferably 0.3 mm to 3 mm, and more preferably 0.5 mm to 2 mm.
In the example shown in FIG. 3, the reinforcing sheet C2 is made of polyvinyl chloride resin and is made of the same resin composition as the waterproof sheet C1 made of polyvinyl chloride resin. It is joined to a waterproof sheet C1 made of polyvinyl chloride resin. The portion of the additional sheet C2 that faces the fixing disk is bonded to the fixing disk adhesive layer D2 by heat welding or the like. Further, the end of the additional tension sheet C2 is waterproofed by a sealer.
Moreover, it is preferable to lay a buffer sheet (not shown) between the heat insulating material B2 and the waterproof sheet C1 made of polyvinyl chloride resin.
Therefore, the waterproof structure according to the third embodiment of the present invention can provide the same operational effects as the first embodiment.

  In the previous embodiment, as the screw body 1, a self-drill screw in which a drill portion 14a is integrally formed with the screw tip 14 is used as the screw body 1, and the screw hole is formed in the folded plate roof B11 of the metal base B1 by rotating the screw body 1. Although tightening while leaving Bh open, the present invention is not limited to this. A screw hole is previously formed in the base B (metal base B1), and the screw body 11 is screwed into the screw hole by rotating the screw body 1. The mountain 11a may be screwed.

A Waterproof sheet fixing fastener 1 Screw body 11 Screw part 11a Screw thread 11r Valley part 2 Coating layer B Base Bh Screw hole C Waterproof sheet D Fixing tool H1 Height dimension H2 Thickness

Claims (5)

A waterproof sheet fixing fastener fastened and fixed to the base for laying and fixing the waterproof sheet on the base,
A spiral thread provided on the threaded portion of the screw body;
A coating layer provided to cover the valley portion of the thread,
The coating layer is made of a material softer than the constituent material of the screw thread, and the screw layer is screwed into the base so that the cover layer is sandwiched between the screw hole of the base and the screw thread. A waterproof sheet fixing fastener characterized by being formed as described above.   The waterproof sheet fixing fastener according to claim 1, wherein a thickness of the coating layer is shallower than a height dimension of the screw thread.   3. The coating layer according to claim 1, wherein the coating layer is formed with a thickness so as to bite between the screw thread and the screw hole of the base as the screw body is screwed into the base. Fastener for fixing tarpaulin. A waterproof sheet laid on the groundwork,
A fixture attached to the base and fixing the waterproof sheet to the base;
A waterproof sheet fixing fastener inserted from the fixture toward the base, and
The waterproof sheet fixing fastener has a spiral thread provided on a screw portion of a screw body, and a coating layer provided so as to cover a valley portion of the thread,
The coating layer is made of a material softer than the constituent material of the screw thread, and the screw layer is screwed into the base so that the cover layer is sandwiched between the screw hole of the base and the screw thread. A waterproof structure characterized by being formed as described above.   The waterproof structure according to claim 4, wherein a thickness of the base is formed smaller than a pitch of the screw thread in the screw body.

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