JP2014091944A - Disk for fixing waterproof sheet and fixation structure of waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that a mechanical fixation method for fixing a waterproof sheet by using a disk for fixation is performed in sheet waterproof structure on the roof floor of a building, here, there is a case that a problem that the disk for fixation deforms to warp like a recess when the disk for fixation is strongly tightened with a screw for fixation, a joint part between the disk for fixation and the waterproof sheet becomes small, and joining between the disk for fixation and the waterproof sheet becomes insufficient when the disk for fixation deforms like the recess in this way.SOLUTION: In a disk for fixation, first reinforcement groove parts are provided in the surroundings of a screw hole, and second reinforcement groove parts are further provided in the surroundings of the first reinforcement groove parts. Then, the first reinforcement groove parts are provided by being divided, approximately uniformly arranged in the surroundings of the screw hole, and the second reinforcement groove parts are provided in the surroundings of the first reinforcement groove parts so as to straddle the first reinforcement groove parts.

Description

  The present invention relates to a fixing disk related to a waterproof sheet fixing structure and a waterproof sheet fixing structure using the same.

  In a roof waterproof structure of a building, a mechanical fixing method using an induction heating device is performed as a method of fixing a waterproof sheet to a base. In this method, a fixing disk is first fixed to a base, and a waterproof sheet is laid thereon. Then, an induction heating device is arranged at a position corresponding to the fixing disk of the waterproof sheet, and the adhesive layer on the upper surface of the fixing disk and the waterproof sheet are bonded and fixed by heating the fixing disk.

  Therefore, in the mechanical fixing method by induction heating, in order to prevent the waterproof sheet from scattering due to strong winds, etc., the fixing disk is firmly fixed to the ground, and the waterproof sheet is sufficiently bonded to the fixing disk. Is required.

  Here, as a method of firmly fixing the fixing disk to the base and increasing the fixing strength of the fixing disk, a method of placing a resin member called an anchor plug in a prepared hole provided in the base in advance is used. . Furthermore, in the heat insulation method, an anchor plug insertion method using a jig for ensuring the fixing strength by securely inserting the anchor plug into the ground is disclosed (Patent Document 1).

  In addition, as a method of sufficiently joining the waterproof sheet to the fixing disk, a waterproof sheet fixing tool (corresponding to the fixing disk) fixed on the waterproof base, and on the outer peripheral portion of the mounting hole of the anchor or the like There is a waterproof sheet fixture in which a hemispherical recess is provided at a predetermined position on a concentric circle away from the mounting hole (Patent Document 2). According to this waterproof sheet fixture, the bottom of the recess is ideal for forming a grounding part with the waterproof base, so that deformation or sinking of the flat part does not occur due to rolling pressure during melt bonding. Melt adhesion is possible.

JP 2006-161373 A JP 2005-220616 A

However, when the fixing disk is strongly tightened with the fixing screws, the fixing disk may be deformed so as to warp in a concave shape. In such a case, even if the plug screw is inserted into the base or has a semispherical recess that contacts the waterproof base, the fixing against the wind pressure accompanying the deformation of the fixing disk into a concave shape is possible. In some cases, the decrease in strength could not be prevented.
This is because when the fixing disk is deformed so as to warp in a concave shape, the fixing disk is heated even if it is heated from above the waterproof sheet laid on the deformed fixing disk to join the fixing disk and the waterproof sheet. Since the outer edge portion of the fixing disk is warped, the fixing disk is hardly heated inside the outer edge portion of the fixing disk, and further, the concave portion of the fixing disk is not sufficiently crimped, resulting in insufficient bonding.
That is, when the fixing disk is deformed so as to be warped in a concave shape, the joining portion between the fixing disk and the waterproof sheet becomes small and insufficient, and the waterproof sheet may be scattered by wind pressure due to strong wind.

  Therefore, the present invention has been made in view of the above points, and even when the fixing disk is fixed with a fixing screw, the fixing disk is sufficiently fixed to the ground without being deformed so as to greatly warp in a concave shape. An object of the present invention is to provide a waterproof disk and sheet waterproof structure.

According to the present invention, the gist is that the first reinforcing groove portion is provided around the screw hole and the second reinforcing groove portion is provided around the first reinforcing groove portion. And the 1st reinforcement groove part is divided and provided, and it is arranged substantially equally around the screw hole, and the 2nd reinforcement groove part is provided around the 1st reinforcement groove part so as to straddle the 1st reinforcement part. .
More specifically, the fixing disk is used for a waterproof sheet structure in which a fixing disk is fixed to a base surface with a fixing screw, and a waterproof sheet is laid and fixed on the fixing disk. A plate-like main body provided with a screw hole into which the screw is driven, a first reinforcing groove provided in the plate-like main body at substantially equal intervals along the periphery of the screw hole, and the adjacent first A fixing disk comprising: a second reinforcing groove provided on the outer peripheral side of the first reinforcing groove so as to straddle both ends of the one reinforcing groove. It is to do. By providing the first reinforcing groove portion around the screw hole in this way, even if the fixing screw is strongly tightened, the stress applied around the screw hole is absorbed by the first reinforcing groove portion. And since a 1st reinforcement groove part is provided substantially uniformly around a screw hole, it can prevent that a stress concentrates locally around a screw hole and a screw hole deform | transforms. Furthermore, a second reinforcing groove is provided around the first reinforcing groove so as to straddle both ends of the adjacent first reinforcing groove, and the stress transmitted through the first reinforcing groove can be absorbed by the second reinforcing groove.
In this way, by providing multiple first and second reinforcing groove portions from the screw holes toward the outer edge of the disk plate, the plate-like body deforms into a concave shape when the fixing screws are driven into the screw holes. It is possible to prevent the fixing screw from coming off easily due to deformation of the screw hole.

  Moreover, it is good also as a fixing disk currently formed in the waveform from the lower end part of the said screw hole to the said 1st reinforcement groove part in the longitudinal cross-sectional view which passes along the said screw hole and the said 1st reinforcement groove part. Thus, when the fixing screw is driven into the screw hole, even if the fixing screw is strongly tightened, the portion from the screw hole formed in the corrugated shape to the first reinforcing groove is deformed so as to be extended to the base side. Therefore, it is preferable because it can absorb stress and prevent the screw hole from being greatly deformed.

  Furthermore, it is more preferable that the first reinforcing groove is provided in the vicinity of the screw hole and is formed shallower than the second reinforcing groove. By providing the first reinforcing groove in the vicinity of the screw hole, deformation around the screw hole can be further reduced.

  Using such a fixing disk, a fixing disk fixed to a base surface with a fixing screw, a waterproof sheet laid on the fixing disk and joined to the fixing disk by an induction heating device, The fixing disk includes a plate-like main body in which a screw hole into which the fixing screw is driven is provided at a substantially center, and the plate-like main body spaced substantially evenly along the periphery of the screw hole. And a second reinforcement groove provided on the outer peripheral side of the plate-like main body so as to straddle both ends of the adjacent first reinforcement groove. It can be a waterproof structure.

  According to the fixing disk of the present invention, by providing the first reinforcing groove portion and the second reinforcing groove portion, the fixing disk is sufficiently fixed to the base without being greatly deformed even if the fixing screw is strongly fixed. .

It is a top view of the disk for fixation which is a 1st embodiment of the present invention. 1 is a perspective view of a fixing disk according to a first embodiment of the present invention. 3A is a cross-sectional view taken along the line AA of the fixing disk of FIG. FIG. 3B is a cross-sectional view taken along the line AA of the fixing disk of FIG. 1 showing a portion formed in a waveform. It is sectional drawing of the waterproof sheet fixing structure using the fixing disk which is 1st Embodiment of this invention. It is a top view which shows the modification of a disk for fixation. It is a top view of the disk for fixation which has a ventilation part which is 2nd Embodiment of this invention. It is a perspective view of the fixation disk which has a ventilation part which is 2nd Embodiment of this invention. It is a top view which shows the modification of the fixing disk which has a ventilation part which is 2nd Embodiment of this invention. It is a perspective view of the fixing disk which has a ventilation part which is 3rd Embodiment of this invention, and a 3rd reinforcement groove part. It is sectional drawing which shows the modification of the waterproof sheet fixing structure using the disk for fixing of this invention. It is sectional drawing which shows the modification of the waterproof sheet fixing structure using the disk for fixing of this invention. It is a top view which concerns on the waterproof sheet fixing structure shown in FIG.

Hereinafter, preferred embodiments will be described in detail with reference to the drawings.
FIG. 4 shows a sectional view of a waterproof sheet fixing structure using the fixing disk according to the first embodiment. According to this, the heat insulating material 2 is provided on the base 1, the fixing disk 4 is disposed on the heat insulating material 2, and is fixed to the base 1 with the fixing screw 5. Further, a waterproof sheet 3 is laid on the heat insulating material 2, and the waterproof sheet 3 is fixed by a fixing disk 4.

  Here, an adhesive layer (not shown) is provided on the upper surface of the fixing disk 4, and the electromagnetic induction heating device 6 is placed on the waterproof sheet 3 corresponding to the fixing disk 4 and heated. The waterproof sheet 3 is fixed on the heat insulating material 2 by melting the adhesive layer of the fixing disk 4 and bonding it to the waterproof sheet 3.

  Next, FIG. 1 is a plan view of the fixing disk 4 according to the first embodiment, FIG. 2 is a perspective view thereof, and FIG. 3A is a cross-sectional view taken along the line AA of FIG. A screw hole 42 is provided at a substantially central portion of the plate-like main body 41. And the 1st reinforcement groove part 44 is arrange | positioned in the circumference | surroundings of the screw hole 42 at substantially equal intervals. Furthermore, a second reinforcement groove 45 is provided on the outer edge side of the first reinforcement groove 44 so as to straddle the adjacent first reinforcement groove 44. More specifically, the second reinforcement groove portion 45a is provided so as to straddle both ends of the first reinforcement groove portion 44a and the first reinforcement groove portion 44b adjacent to the first reinforcement groove portion 44a and to block between the first reinforcement groove portions 44a and 44b. The second reinforcing groove 45 is provided outside the first reinforcing groove 44 in the plate-like main body 41, that is, on the outer peripheral side of the first reinforcing groove 44 from the center of the fixing disk 4.

Here, when the fixing screw 5 is driven into the screw hole 42, stress is applied to the periphery of the screw hole 42, and the stress is transmitted to the outside of the fixing disk 4. At this time, the stress tightening the fixing screw 5 is absorbed by the first reinforcing groove 44.
Further, when the fixing screw is tightened, stress concentration occurs around the screw hole, and when the screw hole is deformed, the fixing screw may come out of the deformed screw hole due to wind pressure. On the other hand, since the first reinforcing groove portion 44 is provided substantially uniformly around the screw hole 42, it is possible to prevent the stress from being concentrated locally around the screw hole 42 and to prevent the screw hole 42 from being deformed. It is possible to prevent the service screw 5 from coming out of the screw hole 42.
Further, a second reinforcing groove portion 45 is provided around the first reinforcing groove portion 44 so as to straddle both ends of the adjacent first reinforcing groove portions 44, and the stress transmitted through the first reinforcing groove portions 44 is absorbed by the second reinforcing groove portions 45. can do. As a result, when the fixing screw 5 is driven into the screw hole 42, it is possible to prevent the plate-like main body 41 from being deformed on the outer edge side of the second reinforcing groove 45, and the fixing screw 5 is removed from the screw hole 42. It can be prevented from becoming easy.

  Here, as shown in the cross-sectional view of FIG. 3A, in order to improve the overall strength of the fixing disk 4, the second reinforcing groove portion 45 is formed with a relatively large groove depth and width. It is arranged at a slightly separated position. Therefore, if the space between the screw hole 42 and the second reinforcing groove 45 is formed flat, the peripheral portion of the screw hole is easily deformed. Therefore, the peripheral portion of the screw hole can be deformed by providing the first reinforcing groove 44. Can be prevented.

Further, the first reinforcing groove 44 is formed shallower than the second reinforcing groove 45. Further, the first reinforcing groove portion 1 is provided on the screw hole side 42 from the second reinforcing groove portion 45 and in the vicinity of the screw hole 42.
3B, which is a cross-sectional view taken along the line AA of FIG. 1, that is, the portion 100 from the lower end 101 of the screw hole 42 to the first reinforcing groove 44 is formed into a corrugated shape. ing. More specifically, it is formed in a waveform from the lower end 101 of the screw hole 42 through the countersink 43 to the lower end 103 of the first reinforcing groove 44 and the upper end 102 on the outer peripheral side. Further, in the present embodiment, the portion 100 formed in this waveform is formed in a shape obtained by rotating a substantially S shape 90 ° to the left. Moreover, in the cut surface cut | disconnected by the AA line like FIG. 3 (B), the part 100 formed in the waveform symmetrically appears in right and left.

  Here, when the fixing screw 5 is driven into the screw hole 42, a downward stress is applied to the counterbore 43, and the stress is transmitted to the outside of the fixing disk 4. At this time, since the portion 100 from the lower end portion 101 of the screw hole to the upper end portion 102 of the first reinforcing groove portion 44 is formed in a corrugated shape, when the fixing screw 5 is driven into the screw hole 42, this corrugated shape is obtained. It is prevented that the screw holes 42 and the counterbore 43 are deformed to be unevenly large by deforming so that the portion 100 of the screw is extended. Further, this can prevent the fixing disk 4 from being deformed into a concave shape. Further, by forming the corrugated portion 100, that is, the portion of the first reinforcing groove portion 44 from the screw hole 42 to be relatively narrow, the periphery of the screw hole 42 can be hardly deformed, and the fixing screw 5 can be removed. It can be prevented from becoming easy.

  Further, the bottom 103 of the first reinforcing groove 44 is positioned above a line 105 connecting the lower end 101 of the screw hole 42 and the outermost edge 104 of the plate-like main body. Here, since the surface of the base 1 when the fixing disk 4 is disposed on the base 1 substantially corresponds to the line 105, the bottom 103 is not in contact with the base 1. Here, the first reinforcing groove 44 is provided inside the second reinforcing groove 45. Accordingly, since a plurality of grooves are provided inside the second reinforcing groove 45 and the bonding area with the waterproof sheet 3 is reduced, it is necessary to provide a larger flat part outside the second reinforcing groove 45 in terms of bonding strength. preferable. Then, it is preferable that the first reinforcing groove 44 is closer to the screw hole 42 and the width and depth of the groove are also reduced. Therefore, if the width of the first reinforcing groove 44 is narrowed and the groove is formed so as to reach the base 1, the bottom 103 of the groove has an acute angle, and this portion may break. Therefore, the first reinforcing groove is preferably formed to a depth that does not reach the base 1.

  More specifically, this embodiment will be described. A screw hole 42 is provided in the approximate center of the plate-like main body 41, and a counterbore 43 for receiving the screw head of the fixing screw 5 is provided around the screw hole 42. Here, the counterbore 43 is intended to prevent the screw head of the fixing screw 5 from protruding from the flat upper end surface of the fixing disk 4. Therefore, the counterbore 43 is preferably formed in a shape corresponding to the shape of the screw head. Three first reinforcing groove portions 44 a, 44 b, 44 c are arranged equally concentrically from the periphery of the screw hole 41 and the counterbore 43. And in the plate-shaped main body 41, the 2nd reinforcement groove part 45a, 45b, 45c is provided in the outer peripheral side of the 1st reinforcement groove part 44. As shown in FIG. A second reinforcing groove portion 45a is provided so as to straddle both ends of the first reinforcing groove portion 44a and the first reinforcing groove portion 44b adjacent to the first reinforcing groove portion 44a and to block between the first reinforcing groove portions 44a and 44b. Similarly, second reinforcing groove portions 45b and 45c are arranged.

Here, there may be a plurality of first reinforcing groove portions 44, and the number is not particularly limited, but is preferably about 3 to 8. If the number is too large (generally 15 or more), the interval between the adjacent first reinforcing groove portions is narrowed, and the stress at the time of fixing the fixing screw is concentrated on the weakest portion, and deformation around the screw hole 42 is caused. May increase.
⇒ Shindo-sama: The expression that stress is easily transmitted between grooves has been deleted to make it difficult to misunderstand.
In order to prevent the stress released to the outside from between the first reinforcing groove portions 44 from being deformed to the outer edge portion of the fixing disk, the adjacent first reinforcing groove portions are closed so as to close the space between the first reinforcing groove portions 44. The 2nd reinforcement groove part is provided so that between 44 may be straddled. Accordingly, since the second reinforcing groove portion only needs to close the space between the first reinforcing groove portions 44, the second reinforcing groove portion may be a single continuous groove portion or may be divided into a plurality of portions.
In this way, if the reinforcing groove is provided as a continuous ring, the stress when tightening the fixing screw is not easily transmitted to the outside from the continuous annular reinforcing groove, and if the stress is not received by this reinforcing groove, the screw hole There is a possibility that the surroundings may be deformed and the screw pull-out strength may be reduced. As the first reinforcing groove portion 44 is divided and arranged on the circumference as in the present embodiment, stress that cannot be absorbed by the first reinforcing groove portion 44 is further transmitted to the outer side, so that it is near the inner screw hole 42. The deformation of the screw is prevented, and the screw pull-out strength is prevented from being lowered. Then, in order to prevent the fixing disk 4 from being greatly deformed by the stress transmitted to the outside, the second reinforcement so as to straddle between the adjacent first reinforcement grooves 44 so as to close the gap between the first reinforcement grooves 44. A groove 45 is provided.

Here, a modification of the fixing disk 4 according to the first embodiment is shown in FIG. FIG. 5A shows a modification in which the second reinforcing groove 45 has a continuous ring shape. Further, since the second reinforcing groove portions 45 are disposed so as to straddle between the adjacent first reinforcing groove portions 44, they extend over three or more first reinforcing groove portions 44 as shown in FIGS. 5B and 5C. May be arranged. Therefore, the same number of first reinforcing groove portions 44 and second reinforcing groove portions 45 may be arranged, or one second reinforcing groove portion 45 corresponding to the plurality of first reinforcing groove portions 44 may be provided.
Further, the width of the first reinforcing groove 44 may be narrower than that of the second reinforcing groove 45 as shown in FIG. 5B, or may be wider as shown in FIG. 5D. Further, a reinforcing groove portion may be further provided outside the second reinforcing groove portion 45, and a substantially circular third reinforcing groove portion 48 may be further provided outside the second reinforcing groove portion 45 as shown in FIG.

Here, the fixing disk 4 is made of metal, hard synthetic resin, wood or the like. Metal is preferable because of its strength and durability. As the material of the steel plates that make up the metal fixing disk, steel plates that are resistant to rust even in high humidity, such as stainless steel plates and steel plates that have been subjected to rust prevention treatment such as zinc, aluminum, magnesium plating or galvanization, are suitable. Used for. The thickness is about 0.6 to 1.5 mm, and the shape is arbitrary, such as a rectangular plate shape that is a square or a rectangle, a circular or elliptical disk shape, a long shape, and the size is one side or The outer diameter can be formed to about 50 to 100 mm.
In the first embodiment, a fixing disk 4 made of stainless steel having an outer shape of about 95 mm and a fixing disk thickness of 4 mm was used.

  Further, the adhesive layer provided on the upper surface of the fixing disk can be provided by applying an adhesive or laminating a thermoplastic resin layer. Then, the adhesive layer and the waterproof sheet 3 are bonded by pressure bonding, heat fusion, solvent welding, or the like. When performing electromagnetic induction heating, the adhesive layer of the fixing disk 4 can be a hot melt adhesive layer such as a hot melt adhesive or a thermoplastic resin that melts by heating. Examples of the hot melt adhesive include polyester, polyamide, and ethylene-vinyl acetate copolymer systems.

  The base 1 is not particularly limited, and a concrete base, a metal base, lightweight foamed concrete (ALC), a steel material, a wood material, or the like is used. Moreover, you may laminate | stack other layers, such as an inorganic board and a mortar material layer, on the foundation | substrate 1. FIG.

  As the heat insulating material 2, polystyrene foam, rigid urethane foam, phenol foam, polyolefin foam such as polyethylene, polypropylene, or the like can be used. In consideration of 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.

  As the waterproof sheet 3, a thermoplastic resin waterproof sheet 3 can be used, and a vinyl chloride resin type, a polyolefin type, an acrylic type, or the like can be used. In the first embodiment, a waterproof sheet 3 made of vinyl chloride resin is used.

  Here, the waterproof sheet 3 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. The base material layer may be provided in the lowermost layer, but may be provided in the middle of the thermoplastic resin layer. The thermoplastic resin layer may be a single layer or a plurality of layers, and the composition of each layer may be different.

  In the first embodiment, the waterproof sheet 3 made of thermoplastic resin and the fixing disk 4 are joined by heat fusion by electromagnetic induction heating. Further, the joining of the thermoplastic resin waterproof sheet 3 and the fixing disk 4 can be performed by thermal fusion or solvent welding other than electromagnetic induction heating.

The fixing screw 5 of this embodiment needs to have a length that is at least long enough to fix the fixing disk 4 to the ground, and has a length that penetrates the support and reaches the ground.
As the material, steel materials such as carbon steel, alloy steel, and stainless steel can be used. Also, the screw head shape of the fixing screw should be flat, flat, and pan so that the head does not protrude from the top surface of the fixing disk, etc., and the recessed shape of the seat surface to be hung with a screwdriver or wrench is a cross hole or hexagon hole A square hole is preferred.

  Here, in these embodiments, a cushioning sheet, a reinforce sheet that improves waterproofness, an anchor screw or an epoxy adhesive member inserted into a pilot hole provided in the base, and a material can be used.

  Here, as the cushioning sheet, a foamed polyethylene sheet having a thickness of 1 to 5 mm, a polyester fiber or polypropylene fiber-based nonwoven fabric, a latticed net obtained by foaming polyethylene, or the like can be used. Thereby, the migration of the plasticizer contained in the vinyl chloride resin waterproof sheet can be prevented. Therefore, for example, in the waterproof sheet fixing structure of FIG. 4, a cushioning sheet can be laid on the heat insulating material 2, the fixing disk 4 can be fixed thereon, and the waterproof sheet 3 can be laid thereon.

Next, the construction method of the installation structure of the waterproof sheet according to the first embodiment shown in FIG. 4 will be described.
First, the heat insulating material 2 is laid on the concrete base 11, and pilot holes are provided in the heat insulating material and the concrete base 11 at positions where the fixing disks 4 are arranged. Then, an anchor plug (not shown) is inserted into a pilot hole provided in the concrete base 11, and a waterproof sheet 3 made of vinyl chloride resin is laid so as to cover the heat insulating material 2 and the fixing disk 4. Then, an electromagnetic induction heating device is placed on the waterproof sheet 3 at a position corresponding to the fixing disk 4, and the adhesive layer provided on the upper surface of the fixing disk 4 is melted by oscillating high-frequency electromagnetic waves, thereby producing a vinyl chloride system. The resin waterproof sheet 3 and the fixing disk 4 are joined.

  FIG. 12 shows a plan view when the waterproof sheet fixing structure shown in FIG. 4 is used. In this way, the heat insulating material 2 is laid on the base 1 (not shown), and a fixing disk is arranged thereon and fixed with fixing screws 5 (not shown). The waterproof sheet 31 is laid on the heat insulating material 2 and the fixing disk 4, and the fixing disk and the waterproof sheet 3 are joined to each other through the adhesive layer of the fixing disk 4. Therefore, when the waterproof sheet 3 is laid as shown in FIG. 12, the heat insulating material 2 and the fixing disk 4 are not visible. The interval between the fixing disks, that is, the fixed pitch can be set to be equal in both the vertical and horizontal directions as shown in FIG. 12, but the fixed pitch is arbitrary. Further, the fixing pitch may be changed according to the fixing portion. For example, the fixing pitch can be reduced at the edge portion of the surface to be waterproofed and can be increased at other portions.

Next, FIG. 6 shows a plan view of a second embodiment in which the fixing disk 4 is provided with a ventilation portion which is a ventilation groove, and FIG. 7 shows a perspective view thereof. Hereinafter, the same reference numerals are assigned to the same components, and detailed descriptions thereof are omitted.
A screw hole 42 and a counterbore 43 are provided at a substantially central portion of the plate-like main body 41. Around the screw hole 42 and counterbore 43, three first reinforcing groove portions 44 are arranged concentrically from the screw hole 42 at substantially equal intervals. And the 2nd reinforcement groove part 45 is provided in the outer edge side of the 1st reinforcement groove part 44 so that the adjacent 1st reinforcement groove part 44 may be straddled. A first ventilation portion 46 that connects the first reinforcement groove portion 44 and the second reinforcement groove portion 45 and a second ventilation portion 47 that extends from the second reinforcement groove portion 45 to the outer edge of the fixing disk 4 are provided. Here, the reinforcing groove portion is provided in a concave shape in the fixing disk 4, and the waterproof sheet 3 is laid on the fixing disk 4, so that air is confined in the reinforcing groove portion. When the fixing disk 4 is heated using the induction heating device 6, the air confined in the reinforcing groove portion expands and the waterproof sheet 3 may expand due to the expansion. Then, the airflow part is provided in a reinforcement groove part, and the swelling of the waterproof sheet 3 can be prevented by releasing the air expanded by heating. In the second embodiment, the first reinforcing groove portion 44 leads to the outer edge of the fixing disk so that air is discharged from the first reinforcing groove portion 44 through the first ventilation portion 46, the second reinforcement groove portion 45, and the second ventilation portion 47. A communicating vent is provided.
Although the ventilation part is preferably provided as in the second embodiment, a form having only the first ventilation part or a form having only the second ventilation part may be employed.

  Furthermore, the top view of the modification of embodiment which has a ventilation part was shown in FIG. According to this, the outer edge of the plate-shaped main body 41 from the 1st ventilation part 46 which connects the 1st reinforcement groove part 44 arrange | positioned around the screw hole 42, and the 2nd reinforcement groove part 45 provided in the outer side of the 1st reinforcement groove part 44 The second ventilation part 47 that leads to is provided. In FIG. 8, three first reinforcing groove portions 44 are connected by the same number of first ventilation portions 46, and three second reinforcement groove portions 45 are connected by the same number of second ventilation portions 47. Further, the first reinforcing groove 44 is formed larger than the second reinforcing groove 46.

FIG. 9 shows the fixing disk 4 according to the third embodiment in which a third reinforcing groove portion is further provided outside the ventilation portion and the second reinforcing groove portion.
A screw hole 42 and a counterbore 43 are provided at a substantially central portion of the plate-like main body 41. Around the screw hole 42 and counterbore 43, three first reinforcing groove portions 44 are arranged concentrically from the screw hole 42 at substantially equal intervals. And the 2nd reinforcement groove part 45 is provided in the outer edge side of the 1st reinforcement groove part 44 so that the adjacent 1st reinforcement groove part 44 may be straddled. Further, a substantially circular third reinforcing groove 48 is provided outside the second reinforcing groove. A first ventilation portion 46 that connects the first reinforcement groove portion 44 and the second reinforcement groove portion 45 and a second ventilation portion 47 that extends from the second reinforcement groove portion 45 to the outer edge of the fixing disk 4 are provided.

Next, a modified example of the waterproof sheet fixing structure using the fixing disk 4 will be described.
FIG. 10 shows a waterproof sheet fixing structure using a metal base as the base 1. According to this, the heat insulating material 2 is laid on the folded plate roof 12 which is a metal base, and the fixing disk 4 is arranged on the heat insulating material 2, and the fixing screw 5 is placed on the fixing disk. It is fixed to the folded plate roof 12. A waterproof sheet 3 made of a vinyl chloride resin is laid as the waterproof sheet 3 so as to cover the heat insulating material 2 and the fixing disk 4. The fixing disk and the waterproof sheet 3 made of vinyl chloride resin are joined to each other through an adhesive layer provided on the upper surface of the fixing disk 4.

  The construction method in this case first lays the heat insulating material 2 on the folded plate roof 12. Then, the fixing disk 4 is disposed on the heat insulating material 2, the fixing screw 5 is driven in, the shaft is penetrated, and is fixed to the folded roof 12. Then, a vinyl chloride resin waterproof sheet 31 is laid so as to cover the heat insulating material 2 and the fixing disk 4. Then, an electromagnetic induction heating device is placed on the vinyl chloride resin waterproof sheet 31 at a position corresponding to the fixing disk 4, and the adhesive layer provided on the upper surface of the fixing disk 4 is melted by oscillating. The vinyl resin waterproof sheet 31 and the fixing disk 4 are joined.

As yet another modification, FIG. 11 shows a waterproof sheet fixing structure that does not use a heat insulating material.
According to this, the fixing disk 4 is arranged on the base 1 and is fixed to the base 1 with the fixing screws 5. Further, a waterproof sheet 3 is laid on the base 1, and the waterproof sheet 3 is fixed by a fixing disk 4.

  Here, an adhesive layer is provided on the upper surface of the fixing disk 4, and the electromagnetic induction heating device 6 is placed on the waterproof sheet 3 corresponding to the fixing disk 4 and heated. The adhesive sheet melts and adheres to the waterproof sheet 3 so that the waterproof sheet 3 is fixed on the heat insulating material 2.

DESCRIPTION OF SYMBOLS 1 Groundwork 2 Heat insulating material 3 Waterproof sheet 4 Fixing disk 41 Plate-shaped main body 42 Screw hole 44 1st reinforcement groove part 45 2nd reinforcement groove part 5 Fixing screw

Claims (4)

A fixing disk used for a sheet waterproof structure in which a fixing disk is fixed to a lower ground with a fixing screw, and a waterproof sheet is laid and fixed on the fixing disk,
A plate-like main body in which a screw hole into which the fixing screw is driven is provided substantially at the center;
A first reinforcing groove provided in the plate-like body at substantially equal intervals along the periphery of the screw hole;
A second reinforcing groove provided on the outer peripheral side of the first reinforcing groove of the plate-like body so as to straddle both ends of the adjacent first reinforcing groove,
Fixed disk with. The fixing disk according to claim 1, wherein the fixing disk is formed in a corrugated shape from a lower end portion of the screw hole to the first reinforcing groove portion in a longitudinal sectional view passing through the screw hole and the first reinforcing groove portion. The fixing disk according to claim 1, wherein the first reinforcing groove is provided in the vicinity of the screw hole and is shallower than the second reinforcing groove. A fixing disk fixed to the lower ground with a fixing screw;
A waterproof sheet laid on the fixing disk and joined to the fixing disk by an induction heating device;
The fixing disk is
A plate-like main body in which a screw hole into which the fixing screw is driven is provided substantially at the center;
A first reinforcing groove provided in the plate-like body at substantially equal intervals along the periphery of the screw hole;
A sheet waterproof structure comprising: a second reinforcing groove portion provided on an outer peripheral side of the first reinforcing groove portion of the plate-like body so as to straddle both ends of the adjacent first reinforcing groove portions.

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