JP2017020273A - Sheet waterproof method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve construction safety and working efficiency of sheet waterproof construction, by surely fixing a fixing disc and a waterproof sheet, by accurately and easily grasping a position of the fixing disc of the waterproof sheet.SOLUTION: A central part of a fixing disc 3 having an adhesive layer 312 on an upper surface and composed of a magnetic substance, is fixed to a backing surface by a fastener 32 composed of a nonmagnetic substance. A position of the fixing disc 3 is detected from above a waterproof sheet 1 put on the fixing disc 3. The adhesive layer 312 of the fixing disc 3 is heated-melted, and the waterproof sheet 1 is bonded-fixed to the fixing disc 3. In a process of detecting the position of the fixing disc 3, a central position of the fixing disc 3 is detected based on a magnetic difference between the fixing disc 3 and the fastener 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet waterproofing method that provides waterproofness by fixing a waterproof sheet to a construction surface.

  As a method of waterproofing the sheet on the roof or rooftop of a building, the waterproof sheet is attached to the entire surface of the surface to be waterproofed by attaching the waterproof sheet over the entire surface with synthetic rubber or an adhesive, and the sheet is waterproofed with a sheet fixing device. A mechanical fixing method for partially fixing the substrate has also been implemented. In the mechanical fixing method, the waterproof sheet is locally fixed to the substrate, so it is not easily affected by the behavior of the substrate, such as cracks occurring in the substrate and vibrations occurring at the joints. There is an advantage that the sheet is hardly broken.

  In this type of waterproofing method, for example, a plurality of fixing disks are dispersed and fixed on the base surface, and then a waterproof sheet is laid on the surface, and the back surface of the waterproof sheet is fixed to the upper surface of the fixing disk. (For example, refer to Patent Document 1).

  As shown in FIG. 10, the fixing disk 101 is coated with a thermoplastic resin adhesive 102 on a disk-shaped disk made of a conductive material such as metal, and the upper surface is covered with a waterproof sheet 103. The The waterproof sheet 103 is fixed by using an electromagnetic induction heater 104, and the adhesive 102 of the fixing disk 101 and the waterproof sheet 103 are bonded by heat fusion.

Japanese Patent Laid-Open No. 10-140774

  In the conventional method using the electromagnetic induction heating tool, the electromagnetic induction heating tool 104 with a built-in induction coil is disposed on the waterproof sheet 103 to perform the heating operation. At this time, the position of the fixing disk 101 is determined from the top of the waterproof sheet 103, depending on the swelling of the fixing disk 101. However, the fixing disk 101 has a thickness of about several millimeters and is thin, so that it is difficult to distinguish the bulge from the top of the waterproof sheet 103, and it is difficult to accurately grasp the position of the fixing disk 101. If the position of the fixing disk 101 cannot be accurately grasped, the electromagnetic induction heater 104 may be displaced from the center of the fixing disk 101 and the adhesive for the fixing disk 101 may be disposed. There is a possibility that 102 cannot be sufficiently melted or the waterproof sheet 103 is not sufficiently fixed.

  The present invention has been made in view of the above problems, and its purpose is to accurately and easily grasp the position of the fixing disk when laying the waterproof sheet via the fixing disk. It is another object of the present invention to provide a sheet waterproofing method capable of securely fixing a fixing disk and a waterproof sheet and improving construction safety and work efficiency.

  The solution means of the present invention for achieving the above object is premised on a sheet waterproofing method in which a waterproof sheet is laid and installed on a plurality of fixing disks disposed on a base surface. In this sheet waterproofing method, the main body is made of a magnetic material, and the center portion of the fixing disk having an adhesive layer made of a thermoplastic resin adhesive on the upper surface of the main body is lowered with a fastener made of a non-magnetic material. A step of fixing to the ground, a detection step of detecting the position of each fixing disk from above the waterproof sheet placed on the fixing disk, and the adhesive layer of the fixing disk is heated and melted to fix the waterproof sheet to the fixing sheet And a heating step of adhering and fixing to the disk. In the detecting step, the center position of the fixing disk is detected based on the magnetic difference between the main body portion of the fixing disk and the fastener.

  Further, as the sheet waterproofing method according to the present invention, a fixing member made of a magnetic material is used for a central portion of a fixing disk having a main body portion made of a non-magnetic material and an adhesive layer made of a thermoplastic resin material on the upper surface of the main body portion Fixing the substrate on the ground surface, detecting the position of each fixing disk from the top of the waterproof sheet placed on the fixing disk, heating and melting the adhesive layer of the fixing disk, A heating step for bonding and fixing to the fixing disk, and the detection step is configured to detect the center position of the fixing disk based on a magnetic difference between the main body portion of the fixing disk and the fastening device. Also good.

  Based on the above-mentioned specific matters, the position of the fixing disk is grasped based on the fastening device provided in the center of the fixing disk, rather than grasping the position of the fixing disk by an indistinguishable element such as the thickness of the fixing disk. It becomes possible to do. In addition, the center position of the fixing disk can be accurately grasped, and the adhesive layer of the fixing disk can be heated and melted using the grasped position as a work center, so that the positional deviation is prevented and effective and stable. Can be heated. Therefore, it is possible to reliably fix the fixing disk and the waterproof sheet, and realize a stable and good waterproof property.

  As a more specific configuration in the sheet waterproofing method, both the detection step and the heating step include both a sensor unit that detects the center position of the fixing disk and a heating unit that heats the fixing disk. Using a construction jig, the sensor part of the construction jig is a proximity switch that detects a non-magnetic body or a magnetic body based on a change in oscillation output of an oscillation circuit including a coil, and is fixed by the sensor section in the detection step. The center position of the working disk is detected, and in the heating step, the heating part of the construction jig is arranged on the waterproof sheet around the detection position by the sensor part, and the fixing disk is heated from above the waterproof sheet. Is preferred.

  As a result, both the detection process and the heating process can be performed with one construction jig, and there is no need to change multiple construction jigs for each of these processes. Work efficiently and continuously.

  Further, in the sheet waterproofing method, the heating portion of the construction jig is provided with a high frequency induction coil excited by an alternating current, and an eddy current is generated in the fixing disk by the electromagnetic induction action of the magnetic field generated by the high frequency induction coil. Thus, it is preferable to heat the fixing disk by eddy current loss. Thereby, the adhesive layer of the fixing disk can be efficiently heated and melted, and the waterproof sheet can be fixed with sufficient strength.

  Further, in the sheet waterproofing method, the construction jig is configured so that the sensor unit and the heating unit can be displaced so that either the sensor unit or the heating unit can act on the fixed disk. In the heating step, it is preferable that the sensor section after detecting the center position of the fixing disk is retracted from the detection position, and the heating section of the construction jig is placed on the waterproof sheet with the detection position as the center.

  As a result, both steps can be performed with good workability in the detection step and the heating step, and after the detection step, the sensor unit is retracted from the detection position, so that the magnetic field between the heating unit and the sensor unit can be reduced. It is possible to prevent the influence from occurring.

  In the present invention, when installing a waterproof sheet via a fixing disk, the center position of the fixing disk can be accurately and easily grasped, and the fixing disk and the waterproof sheet are sufficiently bonded and securely fixed. In addition, the work efficiency can be improved.

It is explanatory drawing which shows the outline | summary of the sheet | seat waterproofing construction method which concerns on embodiment of this invention. It is a perspective view which shows an example of the disk for fixation used in the sheet | seat waterproofing construction method which concerns on embodiment. It is a perspective view which shows an example of the construction jig used in the said sheet | seat waterproofing construction method. It is a block diagram which shows the outline | summary of the sensor part in the said construction jig. It is explanatory drawing which shows an example of the detection operation by the said sensor part. It is explanatory drawing which shows the other example of the detection operation by the said sensor part. It is explanatory drawing which shows the detection process in the said sheet | seat waterproofing construction method. It is explanatory drawing which shows the heating process in the said sheet | seat waterproofing construction method. It is a perspective view which shows the other example of the construction jig used in the said sheet | seat waterproofing construction method. It is explanatory drawing which shows the conventional sheet | seat waterproofing construction method.

  Hereinafter, a sheet waterproofing method according to an embodiment of the present invention will be described with reference to the drawings.

  The sheet waterproofing method of the present invention adds waterproofness by forming a waterproof layer on an outdoor plane such as a rooftop of a building or a flat roof. A waterproof sheet 1 is used for the waterproof layer, and the waterproof sheet 1 is constructed by a mechanical fixing method. The mechanical fixing method is a waterproofing method in which the waterproof layer is applied without being in close contact with the base 2, and in this embodiment, the waterproof sheet 1 is laid through the fixing disk 3 as shown in FIG. As a result, the waterproof sheet 1 is prevented from being affected by cracks and vibrations of the structural casing and the base 2, or the behavior of joints and the like, and a stable waterproof property is imparted.

  On the base 2, disk-shaped fixing disks 3 are distributed at a predetermined pitch. As shown in FIG. 2, the fixing disk 3 is fixedly attached to the base 2 by a fastening tool 32 such as a screw or a bolt.

  The shape and size of the fixing disk 3 are not particularly limited, and can be set to an arbitrary shape and size according to the situation of the foundation or the like to be constructed. The fixing disk 3 illustrated in FIG. 2 has a circular shape when viewed from above, and a plurality of the fixing disks 3 are disposed on the base 2 in a distributed manner.

  In the fixing disk 3, the disk-shaped main body 31 is made of a thin plate-like magnetic body. For example, the main body 31 is made of magnetic stainless steel (SUS430 or the like) and has a convex cross-sectional shape whose peripheral edge can be grounded. A through hole 311 is provided at the center of the main body 31. A fastening tool 32 is inserted into the through hole 311, and the fastening tool 32 is screwed into the base 2 to fix the main body 31. The main body 31 is provided with an adhesive layer 312 made of a thermoplastic resin adhesive on at least the upper surface. The thickness of the main body 31 is not particularly limited, but is, for example, 0.6 to 5 mm, and the thickness of the adhesive layer is about 0.01 to 0.1 mm.

  The waterproof sheet 1 to be put on the fixing disk 3 is a synthetic polymer roofing used for general sheet waterproofing, and includes a thermoplastic material that can be heat-sealed with the adhesive layer 312 of the fixing disk 3, and is a single layer or It consists of a multilayer laminate. For example, the waterproof sheet 1 is formed from a thermoplastic resin material such as polyvinyl chloride resin or polyolefin resin, and is formed into a long band shape and wound in a roll shape.

  In the sheet waterproofing method according to the present embodiment, first, the main body 31 made of a magnetic material of the fixing disk 3 is fixed to the base 2 with a fastening tool 32 made of a non-magnetic material. A plurality of fixing disks 3 are fixed evenly distributed over the entire base 2. For the fastening tool 32, for example, screws or anchor bolts made of non-magnetic stainless steel (SUS304 or the like) are preferable.

  Next, the waterproof sheet 1 is developed on the base 2 while rolling so as not to cause wrinkles, and is spread on the base 2 while partially overlapping the edge portions in the longitudinal direction. As shown in FIG. 1, the waterproof sheet 1 is laid over a plurality of fixing disks 3 installed on the upper surface of the base 2.

  Next, when the fixing disk 3 and the waterproof sheet 1 are fixed, the position of each fixing disk 3 is detected (detection step). In this detection step, the center position of the fixing disk 3 is detected based on the magnetic difference between the main body 31 of the fixing disk 3 and the fastener. For this detection, a construction jig 4 including both a sensor part 42 for detecting the center position of the fixing disk 3 and a heating part 43 for heating the fixing disk 3 shown in FIG. 3 is used.

  As shown in FIG. 1, the construction jig 4 is used by being placed on the fixing disk 3 through the waterproof sheet 1. The construction jig 4 includes a handle 41 at the top, and includes a substantially cylindrical outer shape heating unit 43 and a sensor unit 42 disposed inside the heating unit 43. As shown in FIG. 3, the heating part 43 is formed in a substantially cylindrical shape having a central cavity part 431, and the sensor part 42 is disposed in the central cavity part 431.

  The heating unit 43 incorporates a high-frequency induction coil (not shown) in a cylindrical housing 432 having excellent heat resistance and electrical insulation, and one end of an electric cable 433 is connected thereto. The bottom surface of the heating unit 43 is formed of a smooth surface, is placed on the waterproof sheet 1, and is disposed on the fixing disk 3 via the waterproof sheet 1.

  The high frequency induction coil of the heating unit 43 is arranged in a spiral shape and is excited by an alternating current. Due to the electromagnetic induction effect of the magnetic field generated by the high frequency induction coil, an eddy current is generated in the main body 31 of the fixing disk 3, and the main body 31 is heated by this eddy current loss. The outer diameter of the heating unit 43 is formed to be equal to or slightly larger than the outer diameter of the main body 31 of the fixing disk 3.

  The sensor unit 42 is a proximity switch that detects a non-magnetic material based on a change in oscillation output of an oscillation circuit including a coil. The sensor unit 42 has a coil housed in a bottomed cylindrical metal housing 421 (see FIG. 3). The sensor unit 42 is preferably a high-frequency oscillation type proximity sensor. For example, as shown in FIG. 4, the sensor unit 42 drives the internal coil 422 to oscillate at high frequency by an oscillation circuit 423, and detects an object (fixed disk 3) via a detection surface 426 that intersects the center line X of the coil 422. ).

  When an excitation current flows from the oscillation circuit 423 to the coil 422, a magnetic flux is generated. When this magnetic flux acts on the detected object, an eddy current is generated, and the amount of magnetic flux changes according to the displacement between the detected object and the detection surface 426. As a result, the eddy current in the object to be detected changes, the impedance of the coil 422 changes, and the oscillation waveform of the oscillation circuit 423 changes. The comparison circuit 424 compares the oscillation frequency of the oscillation circuit 423 with a reference frequency and generates an ON signal or an OFF signal. The generated signal is output as a detection signal through the output circuit 425.

  Here, with reference to FIG. 5, the case where the to-be-detected object 5 is the fastener 32 of the fixing disk 3 which is a non-magnetic material will be described. If the construction jig 4 is moved onto the waterproof sheet 1 and there is no proximity between the sensor part 42 and the fastening tool 32, the oscillation circuit 423 exhibits a sine wave oscillation waveform having a constant frequency. The oscillation frequency is compared by the comparison circuit 424, and an OFF signal is output as it is below the reference frequency. As a result, it is determined that there is no object to be detected, that is, the fastener 32 of the fixing disk 3 is not detected.

  After that, when the construction jig 4 is further moved onto the waterproof sheet 1 and the sensor unit 42 and the fastening device 32 (detected object 5) are close to each other, the oscillation circuit 423 is applied to the fastening device 32 made of a nonmagnetic material. The oscillation frequency of the rises. The comparison circuit 424 compares the oscillation frequencies and outputs an ON signal assuming that the oscillation frequency is equal to or higher than the reference frequency. The output circuit 425 outputs a detection signal with an object to be detected, and detects the presence of the fastener 32 of the fixing disk 3. Since the fastening tool 32 is provided at the center of the fixing disk 3, it can be determined that the detection position is the center of the fixing disk 3.

  On the other hand, when the detected object 5 is the main body 31 of the fixing disk 3 made of a magnetic material, as shown in FIG. 6, the oscillation frequency of the oscillation circuit 423 does not change, or the oscillation frequency decreases and changes. The circuit 424 outputs an OFF signal. When the OFF signal is output, a detection signal indicating that there is no object to be detected is output, and it is determined that the fixing disk 3 does not exist at that location or is not the center position of the main body 31 of the fixing disk 3. The

  As shown in FIG. 3, the heating part 43 of the construction jig 4 is formed in a substantially cylindrical shape having a central cavity part 431, and the sensor part 42 is disposed in the central cavity part 431.

  The heating unit 43 and the sensor unit 42 are provided in the construction jig 4 so as to be capable of relative displacement. In the example illustrated in FIG. 3, the sensor unit 42 is provided in the central cavity 431 of the heating unit 43 so as to be movable in the axial direction (vertical direction). For example, the sensor unit 42 can be easily moved upward by winding the cable 427 connected to the sensor unit 42.

  As shown in FIG. 7, in the detection process, the construction jig 4 is moved on the waterproof sheet 1 using the sensor portion 42 arranged at the bottom of the construction jig 4, and the center position of the fixing disk 3 is determined. To detect. When the center position of the fixing disk 3 is detected, the sensor unit 42 is moved upward in the center cavity 431 while the construction jig 4 is held at the detection position as shown in FIG. The sensor unit 42 is retracted from the disk 3 and the waterproof sheet 1. Thereby, the sensor part 42 of the construction jig 4 is separated from the high-frequency induction coil built in the heating part 43.

  Subsequently, the adhesive layer 312 of the fixing disk 3 is heated and melted from above the waterproof sheet 1 by the heating unit 43 of the construction jig 4 (heating process). At this time, by retracting the sensor unit 42 upward, the heating unit 43 and the sensor unit 42 can be prevented from being affected by the magnetic field.

  In the heating process, the heating unit 43 of the construction jig 4 is installed on the waterproof sheet 1 with the detection position by the sensor unit 42 as the center, and the fixing disk 3 is heated from above the waterproof sheet 1. In the detection step, the presence of the non-magnetic fastening device 32 is detected, and the sensor unit 42 is retracted upward without moving the heating unit 43 of the construction jig 4 as it is. In this state, the heating part 43 of the construction jig 4 can be installed on the waterproof sheet 1 with the center position of the fixing disk 3 as the center.

  In a state where the heating unit 43 is installed immediately above the fixing disk 3, a magnetic flux is generated in the heating unit 43, and an eddy current is generated in the main body 31 of the fixing disk 3. The main body 31 of the fixing disk 3 is heated, and the adhesive layer 312 on the upper surface of the fixing disk 3 is heated and melted. As a result, the adhesive layer 312 of the fixing disk 3 and the waterproof sheet 1 in contact therewith are heat-sealed. When the adhesive layer 312 is solidified, the waterproof sheet 1 is bonded to the fixing disk 3. Thereafter, the load of the construction jig 4 and the load caused by the operator pressing through the handle 41 are applied to the fixing disk 3, and the back surface of the waterproof sheet 1 is pressed against the adhesive layer 312, so Fixed to.

  Note that the construction jig 4 is preferably provided with energization confirmation means such as a lamp and a buzzer, and it is preferable to confirm the start and end of energization by lighting the lamp or ringing the buzzer.

  The above-described detection process and heating process are repeated, and all the fixing disks 3 and the waterproof sheet 1 placed thereon are fixed. Thereby, the formation work of the waterproof layer by the waterproof sheet 1 is completed. Since the heating part 43 can be appropriately installed and heated and melted with respect to the center position of the fixing disk 3 without deviation, the waterproof sheet 1 and the fixing disk 3 are securely bonded and fixed. be able to.

  The construction jig 4 is not limited to the configuration in which the sensor portion 42 is provided in the central cavity portion 431 so as to be movable up and down. For example, as shown in FIG. 9, the construction jig 4 may have a configuration in which a heating unit 43 and a sensor unit 42 are provided side by side.

  In this case, the heating unit 43 is integrally provided adjacent to the side of the sensor unit 42. In addition, two slide rails 44 are disposed in parallel to the alignment direction of the sensor unit 42 and the heating unit 43 so as to sandwich the sensor unit 42 and the heating unit 43. Each slide rail 44 is provided with a concave groove, and the concave grooves of the two slide rails 44 are arranged to face each other.

  An upper plate 45 having a handle 41 is disposed above the sensor unit 42 and the heating unit 43, and a plurality of support shafts 46 are suspended from the upper plate 45 in parallel with each other. Two support shafts 46 are provided outside the slide rail 44, and a guide portion 47 that moves up and down along the support shaft 46 is provided through the two support shafts 46. The guide portion 47 is integrally provided on the outer surface of the slide rail 44, and the slide rail 44 is raised and lowered by raising and lowering the guide portion 47.

  The heating part 43 and the sensor part 42 are provided with engaging parts 48 with the slide rails 44 on the outer surface. The engaging portion 48 can travel along the concave groove of the slide rail 44. Thereby, both the heating part 43 and the sensor part 42 can be slid in the horizontal direction on the waterproof sheet 1 via the slide rail 44. Further, by raising and lowering the guide portion 47, both the heating portion 43 and the sensor portion 42 can be moved up and down along the support shaft 46.

  In the detection step, the sensor unit 42 is disposed below the handle 41 and the center position of the fixing disk 3 is detected from above the waterproof sheet 1. If the center position of the fixing disk 3 is detected, the sensor unit 42 is slid in the horizontal direction along the slide rail 44, and at the same time, the heating unit 43 is moved below the handle 41. In the heating step, the vertical position of the guide portion 47 is adjusted to bring the bottom of the heating portion 43 into close contact with the waterproof sheet 1. Thereby, the heating part 43 can be installed on the waterproof sheet 1 around the center position of the fixing disk 3, and the adhesive layer 312 of the fixing disk 3 is reliably heated and melted via the waterproof sheet 1. Can do.

  As described above, in the sheet waterproofing method according to the embodiment, the detection process and the heating process can be continuously performed while the construction jig 4 is placed on one place on the waterproof sheet 1. In addition, when one of the heating unit 43 and the sensor unit 42 is used, the other can be retracted to the side, so that the detection step and the heating step can be performed without affecting each other. Can be implemented. In addition, both the detection process and the heating process can be performed continuously using a single construction jig, and it is not necessary to replace it with a separate work jig, so that construction can be performed very efficiently.

  The sheet waterproofing method according to the present invention can be implemented in various other forms besides the above-described embodiment. For example, the main body 31 and the fastening device 32 of the fixing disk 3 are not limited to those of the above embodiment as long as they have a magnetic difference from each other, and the main body 31 is made of a magnetic metal steel material. On the other hand, the fastener 32 may be a combination made of a nonmagnetic metal such as aluminum. Moreover, the combination which the main-body part 31 consists of a nonmagnetic body, and the fastening tool 32 consists of a magnetic body may be sufficient. Further, the sensor unit 42 is not limited to a proximity switch including a frequency detection type oscillation circuit, and may be configured to include other detection methods. Therefore, the said embodiment is an illustration and is not limited.

  INDUSTRIAL APPLICATION This invention can be utilized suitably as a sheet | seat waterproofing construction method which provides a waterproof layer on the rooftop or roof surface of a building.

DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Base | substrate 3 Fixing disk 31 Main body part 311 Through-hole 312 Adhesive layer 32 Fastening tool 4 Construction jig 41 Handle 42 Sensor part 422 Coil 423 Oscillation circuit 424 Comparison circuit 425 Output circuit 43 Heating part 431 Central cavity part 44 Slide rail 45 Upper plate 46 Support shaft 47 Guide part 5 Object to be detected

Claims (4)

A sheet waterproofing method for laying and constructing a waterproof sheet over a plurality of fixing disks arranged on the lower ground,
A step of fixing the central portion of the fixing disk having a main body portion made of a magnetic material and having an adhesive layer made of a thermoplastic resin material on the upper surface of the main body portion to a base surface with a fastening device made of a non-magnetic material;
A detection step of detecting the position of each fixing disk from the top of the waterproof sheet placed on the fixing disk;
Heating and melting the adhesive layer of the fixing disk, and heating and fixing the waterproof sheet to the fixing disk,
In the detecting step, the center position of the fixing disk is detected based on the magnetic difference between the main body of the fixing disk and the fastening device. A sheet waterproofing method for laying and constructing a waterproof sheet over a plurality of fixing disks arranged on the lower ground,
A step of fixing the central portion of the fixing disk having a main body portion made of a non-magnetic material and having an adhesive layer made of a thermoplastic resin material on the upper surface of the main body portion to a base surface with a fastening member made of a magnetic material;
A detection step of detecting the position of each fixing disk from the top of the waterproof sheet placed on the fixing disk;
Heating and melting the adhesive layer of the fixing disk, and heating and fixing the waterproof sheet to the fixing disk,
In the detecting step, the center position of the fixing disk is detected based on the magnetic difference between the main body of the fixing disk and the fastening device. In the sheet waterproofing method according to claim 1 or 2,
In both the detection step and the heating step, using a construction jig provided with both a sensor unit for detecting the center position of the fixing disk and a heating unit for heating the fixing disk,
The sensor part of the construction jig is a proximity switch that detects a non-magnetic material or a magnetic material based on a change in oscillation output of an oscillation circuit including a coil, and the heating unit is a high-frequency induction coil that is excited by an alternating current With
In the detection step, the sensor unit detects the center position of the fixing disk,
In the heating step, the heating part of the construction jig is arranged on the waterproof sheet around the detection position by the sensor part, and an eddy current is generated in the fixing disk by the electromagnetic induction action of the magnetic field generated by the high frequency induction coil, A sheet waterproofing method, wherein the fixing disk is heated by eddy current loss, and the fixing disk is heated from above the waterproof sheet. In the sheet waterproofing method according to claim 3,
The construction jig is provided so that the sensor unit and the heating unit can be displaced, and either one of the sensor unit and the heating unit can act on the fixing disk,
In the heating step, the sensor part after detecting the center position of the fixing disk is retracted from the detection position, and the heating part of the construction jig is placed on the waterproof sheet with the detection position as a center. Waterproof construction method.

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