JP2012012830A - Sheet retainer and insulation waterproofing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation waterproofing method for roof, capable of buffering the force applied to a sheet retainer due to the bulging of a waterproof sheet so as to prevent a screw from breaking due to metal fatigue and being removed, for example, and to reduce the load on the waterproof sheet and prevent the breakage of the sheet, thereby securing the safety of the roof against wind.SOLUTION: A sheet retainer 10 for fixing a waterproof sheet 4 in a substrate 2 is provided with a first fixing member 12 fixed to the waterproof sheet 4, a second fixing member 14 that overlaps with at least a portion of the first fixing member 12 and is fixed to the substrate, and a buffer material 16 disposed between the first fixing member 12 and the second fixing member 14.

Description

  The present invention relates to a waterproofing method for waterproofing a roof, a structure, or the like of a building, and relates to a sheet fixing device for fixing a part of a waterproof sheet to a base serving as a waterproof target surface, and an insulating waterproofing method using the sheet fixing device.

  Typical waterproofing methods for building roofs and structures are asphalt waterproofing and sheet waterproofing. These waterproofing methods are further classified into the “full surface adhesion method” in which the waterproofing surface and the waterproof sheet are fixed over the entire surface, and the “insulation waterproofing method” in which a portion of the waterproof sheet is fixed to the grounding. The In the insulation waterproofing method, the waterproof sheet is partially fixed to the base and is not fixed completely. Since it is partially fixed, there is an advantage that the behavior of the ground, such as cracks that occur in the ground and vibrations that occur in the joints, is less susceptible to adhesion than the entire surface, and as a result, the waterproof sheet is unlikely to break.

  A typical cross section of a roof constructed by an insulating waterproofing method is shown in FIG. In the insulating waterproofing method, normally, in order to partially fix the waterproof sheet 4 to the base 2, sheet fixing devices 6 (also referred to as sheet fixing tools) are arranged and fixed at fixed intervals on the base 2 to fix the waterproof sheet 4. And the sheet fixing device 6 are fixed using an adhesive or the like. In particular, if a PVC sheet made of a polyvinyl chloride resin is used as the waterproof sheet 4 and the sheet fixing device 6 covered with the polyvinyl chloride resin is used, the waterproof sheet 4 and the sheet fixing device 6 are fixed by solvent welding or heat welding. can do.

  An example of such an insulating waterproofing method and a sheet fixing device used in the method is described in Patent Document 1. In the sheet fixing device described in Patent Literature 1 (referred to as a sliding joint for waterproof sheets in the literature), a metal piece attached to the waterproof sheet is attached in a state that can slide in an arbitrary horizontal direction, Thereby, even after fixing, the occurrence of stress on the waterproof sheet can be prevented in advance, and the adhesion position of the waterproof sheet can be finely adjusted, so that the generation of wrinkles on the waterproof sheet can be prevented. It becomes possible.

Japanese Patent No. 2536906

  However, in the insulation waterproofing method, as described above, the waterproof sheet covering the entire roof surface is fixed in a dotted manner by a partially arranged sheet fixing device, and most of the waterproof sheet is directly bonded to the ground. Not done. Therefore, for example, as shown in FIG. 6, when a strong wind W is generated in a horizontal direction due to a typhoon or the like, the waterproof sheet 4 swells, the sheet fixing device 6 is pulled out, or the waterproof sheet 4 is broken. is doing. Specifically, fluttering occurs in the waterproof sheet 4 due to wind between the sheet fixing devices, or the waterproof sheet 4 is swollen, whereby the sheet fixing device 6 is pulled up in an oblique direction. Therefore, the state where the horizontal force H (lateral force) is applied not only in the vertical direction N but also in the horizontal direction continues intermittently, and is due to metal fatigue of the screws that fix the sheet fixing device 6. Breaking and missing screws occur. Further, in recent studies, it has been found that a force for lifting the waterproof sheet 4 (buoyancy B) works in a strong wind and a horizontal force that pulls the entire waterproof sheet to the side, and the sheet is fixed to the sheet fixing device 6. In some cases, the peripheral portion of the waterproof sheet 4 may be broken. Thus, in the construction of a waterproofing method by mechanical fixing of a sheet fixing device or the like, ensuring safety against wind is an important issue.

  For such a problem, the sheet fixing device of Patent Document 1 is slidable in response to a shift in the adhesion position of the waterproof sheet, but the energy generated by the strong wind, that is, the vertical force due to the swelling of the waterproof sheet, etc. There is no indication of countermeasures that try to absorb and dissipate horizontal forces. Therefore, there is a risk that the sheet fixing device is pulled out or the waterproof sheet is broken.

  Therefore, in view of the above-described problems, the present invention buffers the force applied to the sheet fixing device due to the swelling of the waterproof sheet, etc. in the roof insulation waterproofing method, for example, breakage due to metal fatigue of the screw or screw removal. The purpose of the invention is to prevent the damage to the waterproof sheet by reducing the load applied to the waterproof sheet, and to ensure the safety against the wind of the roof.

  In order to achieve the above object, a first invention is a sheet fixing device for fixing a waterproof sheet to a base, a first fixing member fixed to the waterproof sheet, and at least a part of the first fixing member And a second fixing member fixed to the base, and a cushioning material disposed between the first fixing member and the second fixing member. provide. By providing a cushioning material between the first fixing member and the second fixing member, when the first fixing member receives a force from the waterproof sheet, the first fixing member follows and moves elastically to some extent, Such force (lateral stress) can be buffered or dispersed. In other words, the shock absorbing material, for example, a seismic isolation rubber, converts the energy of the applied force into heat energy in the middle of transmission, so that the energy received from the wind is absorbed and dissipated in the air. The amount is reduced and buffered. As a result, the load applied to the screw from the second fixing member can be reduced, and the wind resistance of the roof can be improved by preventing the bending of the screw due to metal fatigue and the removal of the screw.

  In a second aspect based on the first aspect, the second fixing member includes a limiting portion that limits movement of the first fixing member, and the first fixing member is the limiting portion of the second fixing member. A seat fixing device including a restricted portion whose movement is restricted by the above is provided. When the second fixing member has the limiting portion, for example, when a load exceeding a deformable range is applied to the cushioning material, the movement of the first fixing member is limited by the limiting portion of the second fixing member. Thereby, it can prevent that a 1st fixing member moves excessively with respect to a 2nd fixing member, and can prevent that a 1st fixing member and a 2nd fixing member isolate | separate and break.

  A third invention provides a sheet fixing device according to the first or second invention, wherein the first fixing member and the second fixing member have a disk shape, and the cushioning material is annularly arranged. Since the first fixing member has a disk shape, the waterproof sheet and the first fixing member are fixed in a circular shape or an annular shape. Further, the cushioning material contacts the first fixing member and the second fixing member in an annular shape. Therefore, since there is no directionality in the horizontal direction, the sheet fixing device can buffer the force when receiving a force from any direction from the waterproof sheet.

  A fourth invention provides a seat fixing device according to any one of the first to third inventions, wherein the cushioning material is made of a rubber material having elasticity. By using the rubber material, the sheet fixing device can be easily assembled at the construction site.

  A fifth invention provides a sheet fixing device according to any one of the first to third inventions, wherein the cushioning material is an amorphous elastic adhesive. By using an amorphous elastic adhesive, for example, the manufacturing cost can be reduced.

  A sixth invention provides an insulating waterproofing method in which a part of a waterproof sheet is fixed to a base using the sheet fixing device according to any one of the first to fifth inventions.

  If the sheet fixing device of the present invention is used for an insulating waterproofing method for a roof, the stress received from the waterproof sheet is absorbed by the elastic deformation of the cushioning material interposed between the first fixing member and the second fixing member. Specifically, by providing a cushioning material between the first fixing member and the second fixing member, when the first fixing member receives stress from the waterproof sheet, the first fixing member follows the waterproof sheet. Move elastically. Therefore, the force from the waterproof sheet is buffered or dispersed, and the load on the second fixing member is reduced. That is, the shock absorbing material absorbs the energy of the wind and dissipates it in the air by converting the energy of the force applied to the first fixing member from the waterproof sheet to the heat of the second fixing member. It reduces and "buffers" the absolute amount of energy transmitted from it. Therefore, for example, the screw fixing the second fixing member is prevented from being broken or pulled out due to metal fatigue, the load applied to the waterproof sheet itself is also reduced, and the waterproof sheet is prevented from being damaged, and thus is safe against the wind of the roof. Sex can be secured.

It is a perspective view showing a sheet fixing device by a first embodiment of the present invention. It is a perspective view which shows the roof formed by the insulation waterproofing method using the sheet | seat fixing device by 1st embodiment of this invention. It is sectional drawing along the III-III line of FIG. It is sectional drawing which shows the sheet fixing device by 2nd embodiment of this invention. It is a figure which shows another example of the sheet | seat fixing device by 2nd embodiment. It is sectional drawing which shows the state which the waterproof sheet fixed by the insulation waterproofing method swells with a wind.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, the same or similar components are denoted by common reference numerals.

(First embodiment)
FIG. 1 is a perspective view showing a sheet fixing device 10 according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the roof 1 formed by an insulating waterproofing method using the sheet fixing device 10 of FIG. 1, and a part thereof is cut away so that the structure can be understood. FIG. 3 is a sectional view taken along line III-III in FIG.

  As shown in the figure, the sheet fixing device 10 of the present embodiment overlaps a part of the first fixing member 12 fixed to the waterproof sheet 4 and the first fixing member 12 and is fixed to the base 2. It is comprised from the fixing member 14, and the shock absorbing material 16 arrange | positioned between the 2nd fixing member 14 and the 1st fixing member 12. FIG.

  The 1st fixing member 12 is a metal member which has a disk shape, and the center recessed part 12a which inserts the 2nd fixing member 14 and the buffer material 16 is formed in the center part. As can be seen from FIG. 3, a hole 12b for passing a part of a second fixing member 14 and a screw 18 to be described later is formed at the center of the central recess 12a. Molded into a donut shape. Moreover, the outer peripheral part of the 1st fixing member 12 is bent below so that it may become substantially the same height as the center recessed part 12a, Furthermore, the flange part 12c is formed in the edge part at the horizontal direction. Therefore, the first fixing member 12 is a member having high strength while being lightweight. Note that the diameter R1 of the hole 12b is smaller than the diameter R2 of the upper part of the second fixing member 14, and even if the cushioning material 16 is broken by the force received from the waterproof sheet 4, the central recess 12a remains in the second fixing member 14. Therefore, there is little risk that the first fixing member 12 and the second fixing member 14 are separated. Moreover, it is better that the upper surface of the second fixing member 14 is not in contact with the waterproof sheet 4, and the height H2 of the second fixing member 14 from the base 2 is equal to or lower than the height H1 of the first fixing member 14. Is preferable.

  The first fixing member 12 is a member fixed to the waterproof sheet 4 as described above, and the upper surface of the first fixing member 12 and the rear surface of the waterproof sheet 4 are bonded in a donut shape. For the bonding, a hot-melt type adhesive can be used. When the first fixing member 12 is covered with the same material as the waterproof sheet, for example, the waterproof sheet is a polyvinyl chloride sheet made of polyvinyl chloride resin, and the first fixing member 12 is covered with the polyvinyl chloride resin. In the case where the adhesive surface is bonded, it can be melt-bonded by applying a solvent to the bonding surface, or can be heated and welded by heating the bonding surface.

  As shown in FIG. 1 or FIG. 3, the first fixing member 12 has a plurality of discharge holes 12 d formed on the adhesive surface with the waterproof sheet 4. With this discharge hole 12d, air accumulated between the waterproof sheet 4 and the first fixing member 12, excess adhesive, moisture, or the like can be removed. This is because, if bubbles or extraneous matter remain between the waterproof sheet 4 and the first fixing member 12, a defective portion of the bonding surface is generated, and an effective maximum bonding area cannot be secured. Further, when the sheet is bonded, the adhesive protrudes to the back surface of the first fixing member 12 through the discharge port 12d and hardens into a mushroom shape. The effect of fixing the member 12 more firmly can also be expected. A plurality of discharge holes 12e are also formed in the central recess 12a of the first fixing member 12 in order to remove air accumulated between the cushioning material 16 and the first fixing member 12, excess adhesive, and the like. . By providing the discharge holes 12e, when the solvent used for bonding volatilizes, they can be discharged.

  The second fixing member 14 is a metal member having a shape corresponding to the central recess 12 a of the first fixing member 12. The second fixing member 14 of the present embodiment has a disk shape. The second fixing member 14 is not completely fitted into the central recess 12a of the first fixing member 12, and a certain gap (movable allowance) is provided so that the first fixing member 12 can move upward or horizontally. Is formed so that there is. A horizontal force received from the first fixing member 12 is buffered or dispersed by sandwiching a buffer material 16 described later in the gap. That is, the shock absorbing material converts the energy of the force applied to the first fixing member 12 into heat energy in the middle of transferring the energy to the second fixing member 14, thereby absorbing the energy and dissipating it in the air, thereby transmitting the energy. Reduce the absolute amount of and buffer. The second fixing member 14 is fixed to the base 2 using a screw 18 that is one of fixing tools (fasteners). A screw hole 14a for passing a screw 18 is formed in the central portion of the second fixing member 14, and the second fixing member 14 is shaped so as to have a generally donut shape. Further, the screw hole 14 a is formed in a shape corresponding to the head of the screw 18. Therefore, when the second fixing member 14 is fixed, the head of the screw 18 protrudes from the upper surface of the second fixing member 14. There is nothing. Further, when the second fixing member 14 and the waterproof sheet 4 come into contact with each other, it is necessary to slide between them. Therefore, the second fixing member 14 is covered with a polyvinyl chloride resin or the like like the first fixing member 12. It may be done. However, when covered, it is necessary to be careful not to bond the second fixing member 14 and the waterproof sheet 4.

  The periphery of the screw hole 14a of the second fixing member 14 will be described in detail. The second fixing member 14 has a support portion 14 b that extends downward from the periphery of the screw hole 14 a and supports the second fixing member 14. A flange portion 14c is formed at the lower end of the support portion 14b. The flange portion 14c extends toward the outer periphery. By having the support part 14b and the flange part 14c, even if the 1st fixing member 12 moves to a horizontal direction, the inner side edge part of the 1st fixing member 12 contacts the flange part 14c, and the 1st fixing to the 2nd fixing member 14 is carried out. The movement of the member 12 can be restricted. That is, the support portion 14b and the flange portion 14c of the second fixing member 14 also serve as limiting portions, and the inner end portion of the first fixing member 12 also functions as a limited portion. Further, since the flange portion 14c is provided, the inner end portion of the first fixing member 12 does not directly contact the screw 18, so that the shearing of the screw 18 by the first fixing member 12 is prevented. In addition, although the flange part 14c of this embodiment has spread toward the outer peripheral direction, in order to ensure intensity | strength, the flange part 14c may be formed toward the inner peripheral direction.

  Next, the cushioning material 16 of this embodiment will be described. As can be seen from FIG. 3, the cushioning material 16 is disposed between the second fixing member 14 and the central recess 12 a of the first fixing member 12. Therefore, when receiving the force from the waterproof sheet 4, the first fixing member 12 can elastically move upward or horizontally due to the elastic deformation of the cushioning material 16. In other words, the buffer member 16 absorbs stress like a seismic isolation rubber, so that the force applied to the second fixing member 14 and the screw 18 can be reduced. The amount of deformation and elasticity of the buffer material 16 can be controlled by the physical properties of the buffer material 16. Note that the cushioning material 16 of this embodiment is sandwiched between the second fixing member 14 and the first fixing member 12 by fixing screws 18. Therefore, the cushioning material 16 is effective even if it is not bonded to the first fixing member 12 or the second fixing member 14. However, in order to reinforce the joining force with the first fixing member 12 and the second fixing member 14 or to facilitate the assembly at the construction site, they may be bonded in advance. Further, in the drawing, the buffer material 16 and the first fixing member 12 and the second fixing member 14 are arranged in close contact with each other, but the buffer material 16 is connected to the first fixing member 12 or the second fixing member 14. It may be arranged with a movable allowance (movable space) in between.

  The cushioning material 16 of the present embodiment is a donut-shaped molded rubber material that is formed to be approximately the same size as the second fixing member 14. Like the second fixing member 14, the buffer material 16 is used for passing a screw 18 through the center portion. A hole is formed. Thus, since the buffer material 16 is formed in a donut shape centering on the screw 18, the buffer material 16 comes into annular contact with the first fixing member 12 and the second fixing member 14. Therefore, since there is no directionality in the horizontal direction, the cushioning material 16 is similarly deformed when the force is applied from any direction from the waterproof sheet 4, and the sheet fixing device 10 is removed from the waterproof sheet 4. Can buffer power.

  The material of the buffer material 16 is various rubbers having elasticity, for example, various natural rubbers, chloroprene rubber, butyl rubber, silicon rubber, fluorine rubber, urethane rubber, ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM). Nitrile / polyvinyl chloride blend rubber, ethylene-vinyl acetate rubber, ethylene-acrylic rubber, various thermoplastic elastomers, and the like can be used. In particular, chloroprene rubber, butyl rubber, urethane rubber, fluororubber, EPM, and EPDM are preferable in consideration of weather resistance and heat resistance, and butyl rubber is preferable in consideration of manufacturing cost.

  The cushioning material 16 may be an amorphous elastic adhesive. Since the cost for molding the buffer material 16 becomes unnecessary, the sheet fixing device 10 can be realized at a low cost. Examples of the amorphous elastic adhesive used for the cushioning material 16 include adhesives such as modified silicone, acrylic resin, butyl rubber, and polyurethane.

  The screw 18 is a fixing tool (fastener) for fixing the second fixing member 14 to the base 2, and can be any one as long as it is commonly used for fixing the sheet fixing device in the conventional insulation waterproofing method. A screw having such a shape may be used. For example, a plastic curl plug may be used together, or a screw tip may be opened by hitting the screw head with a hammer to be firmly fixed to the base 2. When selecting the screws 18, it is necessary to pay attention to the pulling strength with respect to the base 2. When the pulling strength is low, it is necessary to increase the number of sheet fixing devices 10 arranged per unit area.

  The first fixing member 12 and the second fixing member 14 of the present embodiment are made of metal as described above, and are manufactured by punching a steel plate having a thickness of 0.5 mm to 2.0 mm. Considering the strength, the thickness of the first fixing member 12 and the second fixing member 14 should be 0.6 mm or more. In particular, the second fixing member 14 preferably has a thickness of about 1 mm. Specific steel sheets include, for example, hot dip galvanized steel sheets, painted hot dip galvanized steel sheets, electrogalvanized steel sheets, hot dip galvanized steel sheets, hot dip zinc-5% aluminum alloy plated steel sheets, painted hot dip zinc-5% aluminum alloy plated steel sheets, and paints. Examples thereof include stainless steel plates, molten 55% aluminum-zinc alloy plated steel plates, painted molten 55% aluminum-zinc alloy plated steel plates, hot rolled stainless steel plates, and cold rolled stainless steel plates. Moreover, although the 1st fixing member 12 of this embodiment is coat | covered with the polyvinyl chloride resin, it is not limited to this, You may coat | cover with a polyester resin and an acrylic resin. The first fixing member 12 and the second fixing member 14 are preferably made of metal from the viewpoint of strength and manufacturing cost, but may be made of reinforced plastic or synthetic resin, for example.

  The outer shape of the sheet fixing device 10, that is, the diameter R3 of the first fixing member 12 is produced between 70 mm and 150 mm. From the viewpoint of portability, manufacturing cost, and adhesiveness with a waterproof sheet, the first fixing member 12 is preferably made with a diameter R3 of 80 mm to 90 mm. The diameter R2 of the second fixing member 14 can be made between 20 mm and 50 mm, and is preferably about 32 mm from the viewpoint of the fixing strength with respect to the base. Further, as described above, the diameter R1 of the hole 12b of the central recess of the first fixing member 12 is preferably smaller than the diameter R2 of the second fixing member 14 and is formed between 10 mm and 15 mm. In addition, these numerical values show the most preferable examples, and the values can be variously changed depending on the arrangement interval of the sheet fixing device 10, the material of the waterproof sheet 4, and the like. Of course, it is not limited to.

  The sheet fixing device 10 according to the present embodiment includes a first fixing member 12, a second fixing member 14, and a cushioning material 16 interposed therebetween. The assembly of these constituent members is performed in the manufacturing process. It may also be performed at the construction site.

  In the sheet fixing device 10 of the present embodiment, the first fixing member 12 and the second fixing member 14 are in a semi-independent state, and a cushioning material exists between them. And even if the buffer material 16 is destroyed, the first fixing member 12 and the second fixing member 14 are not easily separated (not destroyed). Therefore, the safety of the seat fixing device 10 of the present embodiment is equal to or higher than that of the conventional seat fixing device, and is not inferior.

  As shown in FIG. 2, for example, the sheet fixing device 10 configured as described above is disposed on the base 2 of the roof 1 at a constant interval and fixed by screws 18. Then, for example, the waterproof sheet 4 wound in a roll shape is laid on the base 2 while being bonded to the sheet fixing device 10. By using the sheet fixing device 10 of the present embodiment, even if the waterproof sheet 4 is swollen by wind, the vertical force and horizontal force applied to the sheet fixing device 10 are buffered and absorbed by the cushioning material 16, so The load applied to the screw 18 from the two fixing members 14 can be reduced, and the breakage and disconnection of the screw 18 due to metal fatigue can be prevented. Therefore, the waterproof sheet 4 can be prevented from being damaged due to the destruction of the sheet fixing device 10.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a cross-sectional view showing a state in which the sheet fixing device 20 of the present embodiment is fixed to the base 2. The sheet fixing device 20 is used in an insulating waterproofing method like the sheet fixing device 10 shown in FIG. 1, and is fixed to the base 2 and the waterproof sheet 4 is fixed to the upper surface of the sheet fixing device 20. .

  The sheet fixing device 20 includes a first fixing member 22 fixed to the waterproof sheet 4, a second fixing member 24 fixed to the base 2, and a buffer disposed between the second fixing member 24 and the first fixing member 22. The material 26 is provided. However, unlike the sheet fixing device 10 shown in FIG. 1, the bottom surface of the second fixing member 24 is in contact with the base, and the second fixing member 24 is directly fixed to the base 2 without going through the first fixing member 22. Yes. Since the 1st fixing member 22 is arrange | positioned above the 2nd fixing member 24, when the waterproof sheet 4 swells with a wind as it is, it cannot resist with respect to an upward or horizontal force. Therefore, in the sheet fixing device 20 of the present embodiment, the outer peripheral portion of the second fixing member 24 has a limiting portion 29 that limits the movement of the first fixing member 22 relative to the second fixing member 24. Since the material of the buffer material 26 and the screw 28 are the same as those of the seat fixing device 10 of the first embodiment, detailed description thereof is omitted.

  The sheet fixing device 20 has a disk shape, like the sheet fixing device 10 of FIG. 1, and includes a first fixing member 22 and a second fixing member 24 having substantially the same diameter.

  A screw hole 24 a for passing the screw 28 is formed at the center of the second fixing member 24, and the second fixing member 24 is fixed to the base 2 by pressing the screw 28. Further, on the outer peripheral portion of the second fixing member 24, the limiting portion 29 that restricts the movement of the first fixing member 22 rises in the vertical direction as described above. A flange portion 29 a is formed from the upper end portion of the limiting portion 29 toward the inside of the second fixing member 24. In other words, a part of the second fixing member 24 overlaps the first fixing member 22. Therefore, a groove 29b along the outer periphery is formed in the restricting portion 29 of the second fixing member 24, and an outer peripheral end portion (limited portion: a flange portion 22a described later) of the first fixing member 22 is formed in this groove. The movement of the first fixing member 22 with respect to the second fixing member 24 can be restricted by fitting into 29b. Further, the groove 29b of the restricting portion 29 and the outer peripheral end portion of the first fixing member 22 are not completely fitted. That is, a certain amount of gap (movable allowance) is formed between the groove 29b of the restriction portion 29 and the outer peripheral end portion of the first fixing member 22 so that the first fixing member 22 can move following the waterproof sheet 4. Has been. The gap may be about 0.5 mm to 2.0 mm, and is preferably formed with a thickness of about 1.0 mm.

  Next, the first fixing member 22 of this embodiment will be described. The first fixing member 22 has a disk shape as described above, and a hole 22b for passing the screw 28 is formed at the center thereof. However, the hole 22b is formed to turn a screw 28 for fixing the second fixing member 24 through the hole 22b, and the first fixing member 22 is fixed to the second fixing member 24 by the screw 28. There is nothing. Therefore, the diameter R4 of the hole 22b is formed to be larger than the head of the screw 28. Further, an annular recess 22c is formed along the periphery of the hole 22b, and the strength of the inner peripheral end of the first fixing member 22 is increased. The outer periphery of the first fixing member 22 is also bent, and as described above, the flange portion 22a that fits into the groove 29b of the limiting portion 29 is formed at the outer peripheral end portion.

  In the sheet fixing device 20 of the present embodiment, as shown in FIG. 4, the cushioning material 26 is disposed between the first fixing member 22 and the second fixing member 24. Although not shown, since both the first fixing member 22 and the second fixing member 24 have a disk shape, the cushioning material 26 is arranged in an annular shape. Even with such a structure, the movement of the sheet fixing device 20 is restricted by the restricting portion 29, so that it is possible to resist the swelling of the waterproof sheet 4. However, in order to resist with elasticity, it is desirable that the cushioning material 26 is bonded to both the first fixing member 22 and the second fixing member 24 with an adhesive. The height H3 of the upper surface of the first fixing member 22 is preferably made higher than the height H4 of the second fixing member 24 by the buffer material 26.

  Another example of the sheet fixing device 20 of this embodiment is shown in FIG. The seat fixing device 20 in FIG. 5 has substantially the same configuration as the seat fixing device 20 in FIG. 4, but the position where the cushioning material is arranged is different. As shown in the figure, a gap is formed between the groove 29b of the restricting portion 29 and the flange portion 22a (the restricted portion) of the first fixing member 22, and the cushioning material 27 is embedded in the gap, The flange portion 22 a of the one fixing member 22 is sandwiched by the buffer material 27. By adopting such a configuration, the sheet fixing device 20 can buffer the force received from the vertical direction and the horizontal direction by the buffer material 27. It is sufficient that the gap is 0.5 mm or more. When the buffer material 27 needs to have a certain thickness, it is preferable to form the gap with about 1.5 mm. In this configuration, it is not necessary to bond the cushioning material 26 to the first fixing member 22 and the second fixing member 24 as in the sheet fixing device 20 of FIG. Further, the sheet fixing device 20 may be realized by combining the positions of the cushioning materials shown in FIGS. 4 and 5.

  The embodiment of the present invention has been described above with reference to the accompanying drawings. In addition, in this embodiment, although demonstrated on the assumption that the foundation | substrate of a roof is a concrete slab, the sheet fixing device 20 of this invention is not limited to the foundation | substrate of a concrete slab, but general structures, such as a steel frame structure and a wooden structure, etc. It can also be used as a foundation for building structures. In particular, the present invention is effective when the sheet fixing device is more likely to move by receiving a horizontal force, such as a base on which a metal deck or a heat insulating material is laid.

2 Base 4 Waterproof sheet 10, 20 Sheet fixing device 12, 22 First fixing member 14, 24 Second fixing member 16, 26 Buffer material 18, 28 Screw

Claims (6)

A sheet fixing device for fixing a waterproof sheet to a base,
A first fixing member fixed to the waterproof sheet;
A second fixing member that overlaps at least a portion of the first fixing member and is fixed to the base;
A cushioning material disposed between the first fixing member and the second fixing member;
A sheet fixing device comprising: The second fixing member includes a limiting unit that limits movement of the first fixing member relative to the second fixing member,
The sheet fixing device according to claim 1, wherein the first fixing member includes a restricted portion whose movement is restricted by the restricting portion of the second fixing member.   The sheet fixing device according to claim 1, wherein the first fixing member and the second fixing member have a disk shape, and the cushioning material is arranged in an annular shape.   The sheet fixing device according to any one of claims 1 to 3, wherein the cushioning material is made of a rubber material having elasticity.   The sheet fixing device according to any one of claims 1 to 3, wherein the cushioning material is an amorphous elastic adhesive.   An insulating waterproofing method for fixing a part of a waterproof sheet to a base using the sheet fixing device according to any one of claims 1 to 5.

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