JP2014156747A - Laying method of waterproof sheet and waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and safely attain proper laying of a waterproof sheet, by easily eliminating wrinkles in laying and easily and reliably laying the waterproof sheet in a predetermined position without depending only on skilled skill of an operator.SOLUTION: In a laying method of a waterproof sheet 10 provided for fixedly laying the waterproof sheet 10 on a sheet joining member 12 installed in a building frame 1 of a structure, the roll-like waterproof sheet 10 is expanded by rolling to an installation place, and the waterproof sheet 10 is laid while joining to the sheet joining member 12 with every installation place of the sheet joining member 12. A material of being 0.1-2% in a heating shrinkage factor is used as the waterproof sheet 10.

Description

  The present invention is, for example, a waterproof sheet laying method in which a waterproof sheet is constructed by laying a waterproof sheet on a roof of a structure such as a building via a sheet joining member, and waterproofing that can be used in such a method. The present invention relates to improvement of a sheet, and in particular, relates to easily eliminating a wrinkle at the time of laying and securely laying it at a predetermined position so as to easily lay a waterproof sheet.

  For example, when waterproofing the roof of a structure such as an office building or a school, the waterproof sheet should not be directly bonded to the base of the structure, so that the cracks and vibrations of the housing, joint behavior, etc. In some cases, a so-called insulating method (mechanical fixing method) is employed, which is less affected by the above-mentioned and can ensure waterproofness in the event of an earthquake or the like.

  In this construction method, a sheet joining member made of a steel plate or the like whose surface is coated with a synthetic resin of the same quality as the waterproof sheet is used, and a sheet joining member having, for example, a belt-like shape is formed on the terminal of the structural body. Installed at places other than the terminals, for example, sheet joining members having a disk shape are installed at a predetermined pitch, and these sheet joining members are attached to the housing with a fixture such as a nail, and then these sheets A waterproof sheet is laid from above the joining member, and the waterproof sheet is welded to and joined to a required sheet joining member, thereby fixing the waterproof sheet to the structural body via the sheet joining member.

  In this case, the welding of the waterproof sheet to the sheet joining member is conventionally performed by spreading the waterproof sheet and laying the entire surface including the place where the sheet joining member is installed, and then laying on the disk-shaped sheet joining member. The needle of the syringe is passed through the waterproof sheet, and a solvent is injected between the back surface of the waterproof sheet and the surface of the disc-shaped sheet joining member, or a plurality of belt-shaped waterproof sheets are attached to both ends in the longitudinal direction. After laying partially overlaid, a brush brush was inserted between the waterproof sheet and the housing, a solvent was applied to the disk-shaped sheet joining member, and the waterproof sheet was welded to the sheet joining member (for example, , See Patent Documents 1 to 3).

  However, in these conventional methods, when the waterproof sheet is rolled and unfolded, there is a problem that the waterproof sheet is laid with wrinkles if there is no skill of the operator. In particular, since the waterproof sheet is fixed to the sheet bonding member at a predetermined location by welding or the like, and the portion bonded to the sheet bonding member cannot be displaced, it is very difficult to eliminate wrinkles after welding. In addition, as a result of requiring careful and careful work, work efficiency is lowered, and as a result, there may be a problem that it takes days for construction.

  In addition to preventing wrinkles, it is not always easy for a waterproof sheet to be rolled and deployed to an appropriate predetermined position unless it is a skilled worker. Or, the waterproof sheet may be laid in a meandering state. Since these corrections require work that is very time-consuming, such as unwinding the waterproof sheet, the situation is similarly undesirable from the viewpoint of work efficiency.

  On the other hand, it is absolutely necessary to avoid negligence in ensuring safety due to the need to reduce work efficiency and work time. In particular, waterproof sheets are laid on a relatively high place such as the rooftop. Therefore, it is necessary to fully consider the drop.

Japanese Examined Patent Publication No. 58-036705 JP-A-8-246609 Japanese Patent Laid-Open No. 11-200563

  In view of the above-mentioned problems, the problem to be solved by the present invention is to easily eliminate wrinkles at the time of laying and to easily and securely place a waterproof sheet in a predetermined position without depending only on the skill of an operator. It is an object of the present invention to provide a waterproof sheet laying method capable of easily and safely achieving proper laying of a waterproof sheet by laying on the waterproof sheet, and a waterproof sheet usable for such a method.

(1. Installation method of waterproof sheet)
As a first means for solving the above-mentioned problems, the present invention provides a waterproof sheet laying method in which a waterproof sheet is fixed and laid on a sheet joining member installed on a structural body. Use a waterproof sheet with a shrinkage rate of 0.1% or more, roll the roll-shaped waterproof sheet to the installation location, and lay it while bonding the waterproof sheet to the sheet connection member for each installation location of the sheet connection member The present invention provides a method for laying a waterproof sheet, characterized by

  In addition, the present invention provides a waterproof system characterized in that, as a second means for solving the above-mentioned problems, a waterproof sheet having a heat shrinkage rate of 2% or less is used as the waterproof sheet in the first solution means. A method for laying a sheet is provided.

  According to the present invention, as a third means for solving the above-described problems, the waterproof sheet is processed into a sheet shape by extrusion molding in either of the first or second solving means. A method for laying a sheet is provided.

  According to the present invention, as a fourth means for solving the above-described problem, in any one of the first to third solving means, a guideline corresponding to a place where the waterproof sheet should be laid is installed, and the waterproof sheet is provided. The present invention provides a method for laying a waterproof sheet characterized by rolling and unfolding according to a guideline.

  The present invention uses, as a fifth means for solving the above-mentioned problems, in the first to fourth solving means, a waterproof sheet having a long-side end face having linearity. A waterproof sheet laying method characterized by the above is provided.

  As a sixth means for solving the above-mentioned problems, the present invention provides a waterproof sheet according to any one of the first to fifth means, and a sheet coated with a synthetic resin of the same quality as the waterproof sheet. When welding to the joining member with a solvent and joining and fixing to the sheet joining member, the solvent is applied not only to the surface of the sheet joining member but also to the portion of the waterproof sheet that overlaps the sheet joining member. A method of laying a waterproof sheet is provided.

  The present invention provides a seventh means for solving the above-described problems, in any one of the first to sixth solving means described above, when the waterproof sheet is dropped to a predetermined position from the end of the place where the waterproof sheet is to be laid. The present invention provides a method for laying a waterproof sheet, characterized by installing a mark for prevention.

(2. Waterproof sheet)
The present invention also provides the following waterproof sheet that can be used in any one of the first to seventh solutions. That is, the present invention provides a waterproof sheet that is fixed to a sheet joining member installed on a structural body and laid on the structure as an eighth means for solving the above-described problem, It is intended to provide a waterproof sheet characterized by having a heat shrinkage rate of at least%.

  The present invention provides, as a ninth means for solving the above-mentioned problems, a waterproof sheet having a heat shrinkage rate of 2% or less in the eighth solving means.

  As a tenth means for solving the above-mentioned problems, the present invention provides a waterproof sheet that is processed into a sheet shape by extrusion molding in any of the eighth or ninth solving means. It is to provide.

  The present invention provides, as eleventh means for solving the above-mentioned problems, a waterproof sheet characterized in that the end face of the long side has linearity in the eighth to tenth solving means. is there.

  According to the present invention, as described above, the waterproof sheet is a waterproof sheet having a heat shrinkage rate of 0.1% or more, that is, a waterproof sheet that shrinks (shrinks) by heating, and the ratio of the shrinkage, that is, Since a material having a heat shrinkage of 0.1% or more is used, the waterproof sheet rises to about 80 ° C. in the summer when exposed to direct sunlight on the rooftop, etc., as will be understood from examples described later. Therefore, even if the waterproof sheet is laid in a state where some wrinkles occur, the temperature rises with the passage of time after laying, i.e., due to heating, the waterproof sheet shrinks and wrinkles naturally Because it is eliminated, it is possible to eliminate wrinkles very easily without relying only on the skill of the worker, and it is possible to easily lay a waterproof sheet and to improve work efficiency. Can greatly improve There is a kill practical benefits.

  On the other hand, according to the present invention, as described above, since the waterproof sheet having a heat shrinkage rate of 2% or less is used as the upper limit value, the waterproof sheet contracts more than necessary, and is generated by contraction of the sheet. The tensile stress is concentrated on the corners of the terminal of the chassis, and the sheet-like members such as belts installed on the terminal do not float or come off from the chassis of the structure. There are real benefits that can be made.

  In addition, according to the present invention, as described above, for example, a guideline corresponding to a location where a waterproof sheet should be laid is installed by inking, and the waterproof sheet is rolled and expanded in accordance with this guideline. Therefore, there is an advantage that the waterproof sheet can be appropriately laid at a predetermined position.

  Furthermore, as described above, the present invention uses a waterproof tote with a long end face having linearity, so that the waterproof sheet can be installed in a predetermined straight line at an appropriate position. For this reason, there is an advantage that the waterproof sheet can be prevented from being displaced from a predetermined position, meandering or curved.

  Similarly, according to the present invention, as described above, when bonding and fixing to the sheet bonding member, the solvent is applied not only to the surface of the sheet bonding member but also to the portion of the waterproof sheet that overlaps the sheet bonding member. Since it is applied and welded, the adhesiveness of the solvent is increased as compared with the case where the welding is applied only to the sheet joining member, and there is an advantage that the waterproof sheet can be firmly fixed to the sheet joining member.

  In addition, according to the present invention, as described above, for example, since a mark for preventing a fall such as a pole is installed at a predetermined position in front of the end of the place where the waterproof sheet is to be laid, When rolling and unpacking a roll-shaped waterproof sheet or welding to a sheet joining member, the work is often done in a backward direction with respect to the laying end. There is an actual advantage that it is possible to ensure the safety of the worker by preventing the fall even at a high place.

It is a top view of the state which implements embodiment using a solvent in the laying method of the waterproof sheet of this invention. It is a top view of the state which implements embodiment using a high frequency in the laying method of the waterproof sheet of this invention. It is a top view of other embodiment of the laying method of the waterproof sheet of the present invention. It is a figure which shows the expansion-contraction rate in 60 degreeC of the Example and comparative example of the waterproof sheet of this invention. It is a figure which shows the expansion-contraction rate in 80 degreeC of the Example and comparative example of the waterproof sheet of this invention. It is a figure which shows the expansion-contraction rate in the various temperature of the Example of the waterproof sheet of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a state in which a method for laying a waterproof sheet 10 according to the present invention is carried out. The method for laying a waterproof sheet 10 is to fix a waterproof sheet 10 to a sheet joining member 12 installed on a housing 1 of a structure. It is to be laid. That is, by fixing the waterproof sheet 10 via the sheet joining member 12 without fixing the waterproof sheet 10 directly to the casing 1, it is a laying method that is less affected by cracks, vibration, joint behavior, and the like of the casing 1. is there.

  Examples of structures on which the waterproof sheet 10 is laid include roofs, verandas, balconies, and the like of business buildings such as office buildings and school buildings, and residential buildings such as apartments. The present invention can be applied to these structures requiring waterproofness.

(1. Sheet joining member)
In this case, first, as shown in FIG. 1, a band-shaped sheet joining member 12A is installed at a terminal (edge) on a housing 1 such as a roof of a structure, and a disk-shaped member is provided at a location other than the terminal. The sheet joining members 12B are installed at a predetermined pitch. In this case, these sheet joining members 12 are fixedly attached to the housing 1 by a fixing tool such as a nail or a bolt (not shown).

  In addition, as shown in FIGS. 1 and 2, the disk-shaped sheet bonding member 12 </ b> B installed at a location other than the terminal of the housing 1 has two sheet bonding members 12 </ b> B arranged in parallel in the transverse direction of the waterproof sheet 10. And this can be arranged and arranged in multiple rows in the deployment direction (longitudinal direction) of the waterproof sheet 10. However, the present invention is not limited to this configuration, and as shown in FIG. 3, the disk-shaped sheet joining members 12B are arranged in a staggered manner in a staggered manner rather than in parallel in the transverse direction of the waterproof sheet 10. You can also. However, it is necessary to set the disc-shaped sheet joining member 12B so as to be disposed at a place other than the overlapping portion 10A of the waterproof sheet 10 as shown in FIGS.

  These sheet joining members 12 are not particularly limited in shape and size, and can be made to have any shape and size adapted to the installation location. For example, as shown in FIG. 1, when installing in the terminal of the housing 1, it forms in plate shapes, such as a substantially L shape and a strip | belt shape, and when installing in the location except the terminal of the housing 1 Can be installed in a disc-like shape having a circular shape or the like and scattered on the housing 1.

  Moreover, since these sheet | seat joining members 12 are joined with the waterproof sheet 10 on the surface, they are formed so that they can be welded to the waterproof sheet 10 with a solvent or a high frequency described later. That is, the sheet joining member 12 is formed from an aspect that can be welded to the waterproof sheet 10, specifically, a synthetic resin plate, a synthetic resin-coated steel plate having a surface coated with a synthetic resin as a steel plate, and the like. be able to. Examples of the steel plate include stainless steel in consideration of its corrosion resistance and the like.

  On the other hand, as the synthetic resin used for the sheet bonding member 12 and the coating material on the surface thereof, for example, a soft synthetic resin such as polyvinyl chloride resin, polyolefin resin, ethylene vinyl acetate copolymer, or synthetic rubber type resin can be used. The material can be selected, but among them, polyvinyl chloride resin is particularly preferable because it is excellent in solvent weldability and heat fusion property. The sheet joining member 12 can be formed by pressing with a press molding machine or the like when formed from a synthetic resin-coated steel sheet, and can be appropriately formed by injection molding or the like when formed as a synthetic resin plate. The resin processing method can be used.

(2. Installation of waterproof sheets)
After the sheet joining member 12 is installed on the housing 1 as described above, the waterproof sheet 10 wound up in the form of a roll is rolled and deployed at the installation location as shown in FIG. For this reason, the remaining waterproof sheet 10 that has not yet been laid is not blown by the wind and can be laid even under strong winds. In this case, as shown in FIG. 1, the waterproof sheet 10 is generally formed in a long band shape. However, a plurality of waterproof sheets 10 are prepared according to the installation location, and the plurality of waterproof sheets 10 are arranged at the end in the longitudinal direction. Lay down while partially overlapping parts to ensure waterproofness. The overlapping portions 10A of the plurality of waterproof sheets 10 can be welded to each other after laying or in parallel with laying by a heat welding machine (not shown) or the like.

  When the preventive sheet 10 is rolled out, it can be laid from the first row of waterproof sheets 10 (the uppermost waterproof sheet 10 in FIGS. 1 and 2) closest to the terminal. In order to secure the access and work location from the terminal, and to perform the waterproof construction on the terminal as a finish, it is preferable to lay from the waterproof sheet 10 in the second row from the terminal side of the housing 1. At that time, unlike the waterproof sheet 10 closest to the terminal, the guideline for laying is difficult to understand. Therefore, in the present invention, as shown in FIG. To do. Accordingly, at the same time, when the waterproof sheet 10 is laid along the terminal (wall surface) from the first row of waterproof sheets 10 closest to the terminal (wall surface), the terminal itself to which the waterproof sheet 10 should be aligned is linear. If it does not have, the straightness of the waterproof sheet 10 cannot be ensured, so that the straightness of the waterproof sheet 10 is ensured without being affected by the linearity accuracy of such a terminal. The merit which can be secured also arises.

  The guideline 14 is not particularly limited as long as it is a guide when laying, but the guideline 14 can be obtained by placing a linear member such as inking or string or string. In this case, in order to secure a waterproof finish portion from the wall surface to the floor surface of the terminal, and taking into account the width (50 mm) of the overlapping portion 10A of the waterproof sheet 10, a substantially L-shape installed at the terminal of the housing 1 The guide line 14 is installed at a position on the inner side of the sheet width -30 mm of the waterproof sheet 10 from the corner of the sheet-like sheet joining member 12 </ b> A such as a belt shape. For example, when a waterproof sheet having a width of 1260 mm is laid, the guide line 14 is set at a position 1230 mm from the corner of the entrance.

  In addition, first, the roll-shaped waterproof sheet 10 is unwound by about 1 to 2 m, and the end face in the longitudinal direction (long side) of the waterproof sheet 10 is aligned with the guideline. After confirming, it rolls along this guideline 14 and develops. Thereby, the waterproof sheet 10 can be appropriately laid in a predetermined position. In addition, when the end surface of the longitudinal direction of the waterproof sheet 10 deviates from the guideline 14, the both ends of the roll-shaped waterproof sheet 10 are lifted to correct the direction. This is because if only one side of the waterproof sheet 10 is lifted and corrected, it causes wrinkles.

  When laying the second and subsequent waterproof sheets 10, a wrap line of 50 mm or more (a portion to be the overlapping portion 10) is provided on the adjacent waterproof sheet 10 already laid, and this is used as a guideline 14. , Continue laying work.

  Further, in this case, in particular, the sheet bonding member 12 is not bonded to the sheet bonding member 12 after unwinding all of the waterproof sheets 10 and laying the entire area on the installation site. It is desirable that the waterproof sheet 10 is rolled and deployed and laid while the waterproof sheet 10 is bonded to the sheet bonding member 12 for each installation location. That is, the laying operation of the waterproof sheet 10 and the welding operation to the sheet joining member 12B are performed in parallel.

  For this reason, first, since the welding work can be performed without waiting for the spread of the waterproof sheet 10 as well as the number of work steps, the work time can be shortened and the waterproof sheet 10 is rolled and unfolded. Since it is possible to work only by the workers for the work and the welding work, it is possible to work by 2 to 3 people, reducing the number of workers, and laying the waterproof sheet 10 efficiently.

  At the same time, as shown in FIG. 1, the waterproof sheet 10 is already fixed to the sheet bonding member 12 in the portion of the waterproof sheet 10 laid on the sheet bonding member 12 </ b> B, and the waterproof sheet 10 is laid in a free state. Since there is no place where the waterproof sheet 10 is provided, the waterproof sheet 10 does not swell or rise, and the laying operation can be performed appropriately and efficiently even under strong winds.

(3. Structure of waterproof sheet)
As for the material of the waterproof sheet 10 to be laid, it can be used without particular limitation as long as it is a waterproof resin sheet. For example, a polyvinyl chloride resin, Soft synthetic resins such as polyolefin resins and ethylene vinyl acetate copolymers, and those formed from synthetic rubber materials can be used. Among them, in particular, polyvinyl chloride resin is solvent-welded. It is preferable to use the same material as the surface of the sheet joining member 12.

  In the present invention, the waterproof sheet 10 having a heat shrinkage rate of 0.1% or more is used as the waterproof sheet 10. That is, in the present invention, a waterproof sheet that shrinks, that is, shrinks when heated, and a waterproof sheet 10 that has a shrinkage ratio, that is, a lower limit of a heat shrinkage rate of 0.1% or more is used. Is.

  As can be seen from the examples described later, the waterproof sheet 10 is laid at a location where the temperature rises when exposed to direct sunlight, such as on the rooftop, so that the waterproof sheet 10 is in a state where some wrinkles occur. If the waterproof sheet 10 has a heat shrinkage ratio of 0.1% or more, that is, shrinks at a rate of 1/1000 unit even when laid, the temperature rises with the passage of time after laying, that is, by heating. This is because the waterproof sheet 10 is shrunk and wrinkles are naturally eliminated without particularly performing any correction work. For this reason, if the waterproof sheet 10 of the present invention is used, it is possible to eliminate wrinkles very easily without relying only on the skill of the operator, and it is easy to properly lay the waterproof sheet 10. It can be realized and work efficiency can be greatly improved. In particular, it is useful in that it is possible to perform appropriate laying work even if not a so-called skilled craftsman.

  Such a waterproof sheet 10 can be formed by processing into a sheet form by extrusion molding. Specifically, after the waterproof sheet 10 is processed into a rubber-like shape by melting a raw material such as polyvinyl chloride resin, it is passed through a plurality of rolls (not shown) arranged at regular intervals while pulling it. The sheet is formed while being controlled to a predetermined thickness, and then cooled and molded. At this time, since the waterproof sheet 10 is formed by cooling while being pulled, the stress applied to the waterproof sheet 10 at the time of pulling remains in the waterproof sheet 10 as a molded product as distortion. When the sheet is reheated (when exposed to direct sunlight or the like), the strain that has been pulled is released in the direction of contraction, so that the waterproof sheet 10 naturally contracts.

  In the present invention, the shrinkage ratio, that is, the heat shrinkage rate is 0.1%, that is, the tensile strength and speed so that the tensile stress at the time of molding remains in the waterproof sheet 10 as distortion, The cooling temperature is set. As described above, the heat shrinkage rate of 0.1% or more is, in one case, when the wrinkle is generated in the waterproof sheet 10, when the state is verified, it is locally about 0.1%. Since it was found that wrinkles occur when the difference in length occurs, conversely, if the heat shrinkage rate is 0.1% or more, the difference in length is eliminated and wrinkles disappear. This is because the. Moreover, when the heat shrinkage rate and the elimination of wrinkles were demonstrated based on this consideration, as shown in the examples described later, the waterproof sheet having a heat shrinkage rate of actually less than 0.1% (1 / 10,000 order). However, if the waterproof sheet 10 having a heat shrinkage rate of 0.1% or more (1/1000 order to 1/100 order) is not able to eliminate wrinkles, wrinkles will be eliminated with the passage of days. This is because it was confirmed.

  On the other hand, the upper limit value of the heat shrinkage rate of the waterproof sheet 10 is rather technically more difficult to form the waterproof sheet 10 having a heat shrinkage rate that is too high, such as 5%. Since the upper limit value (limit) of the shrinkage rate is inevitably determined, it is not always necessary to set the upper limit as the scope of the invention, but it is desirable to set it to 2% or less at the maximum. This is because when the heat shrinkage rate is 2% or more, the waterproof sheet 10 contracts more than necessary, and the tensile stress generated by the contraction of the waterproof sheet 10 concentrates on the corner of the terminal of the housing 1, This is because there is a possibility that the sheet joining member 12A such as a belt-like shape installed on the floor may float or come off from the housing 1 of the structure.

  In the present invention, as the waterproof sheet 10, the long side (longitudinal direction) end face has linearity. This is because, if the waterproof sheet 10 has linearity, the waterproof sheet 10 can be installed in a predetermined straight line at an appropriate position. Therefore, the waterproof sheet 10 may deviate from the predetermined position, meander or bend. This is to prevent them from being arranged.

  Here, “linearity” refers to the side surface in the longitudinal direction (long side) of the waterproof sheet 10 with reference to a string in which both ends (start and end) in the longitudinal direction of the waterproof sheet 10 having a length of 10 m are linearly connected. However, it means that the distance at the position farthest from the reference string is within 15 mm, preferably within 10 mm. This is because even when the waterproof sheet 10 is processed into a predetermined shape set at the time of molding, an external mechanical or thermal force is applied at the time of subsequent winding, storage or transportation. As a result, since distortion may occur and the sheet may be deformed, such a waterproof sheet 10 is excluded. On the other hand, if the deformation is within this range, there will be no significant influence upon laying. In addition, when transporting and storing, the roll-shaped waterproof sheet 10 may be deformed when stacked and stacked, and when rolled and unfolded, a curl may remain. It is necessary to. The method for fixing the waterproof sheet 10 to the sheet joining member 12 is not particularly limited, and examples thereof include welding with a commonly used solvent and heat welding with high frequency.

(4. Welding with solvent)
In the method of the present invention described above, an embodiment in which the waterproof sheet 10 is bonded to the sheet bonding member 14 with a solvent will be described with reference to FIG. 1. First, as shown in FIG. One end of 10 is unwound, and the long side end portion (end surface in the longitudinal direction) of the waterproof sheet 10 is aligned with the guide line 14. Further, the straightness / street of the waterproof sheet 10 is confirmed.

  Next, the waterproof sheet 10 is rolled and unfolded so as to be pulled while applying a certain amount of tension so as not to cause wrinkles in the waterproof sheet 10. In this case, as shown in FIG. 1, when the waterproof sheet 10 is rolled and unfolded to the front of the disk-shaped sheet joining member 12 </ b> B installed at a location excluding the terminal of the housing 1, the temporary rolling is stopped. Then, a brush brush (not shown) is inserted between the scroll-shaped waterproof sheet 10 and the casing 1 so as to insert not only the surface of the sheet joining member 12B but also the waterproof sheet 10 in the present invention. After the solvent is also applied to the portion overlapping the sheet bonding member 12B, the waterproof sheet 10 is immediately immediately rolled again over the sheet bonding member 12B coated with the solvent. That is, in the present invention, the solvent is applied to the two surfaces of the sheet bonding member 12 </ b> B and the waterproof sheet 10.

  It is desirable that the waterproof sheet 10 is rolled and passed over the sheet bonding member 12B as soon as possible after the solvent is applied to the sheet bonding member 12B. However, as much as possible so that the welding strength by the solvent does not decrease. It is necessary to pass the waterproof sheet 10 over the sheet joining member 12B before the solvent component is volatilized. In particular, in the summer, the solvent is applied to the heated sheet joining member 12B. This is because the adhesive strength may be insufficient quickly.

  Further, as in the embodiment shown in FIGS. 1 and 2, when two sheet joining members 12B are arranged in parallel in the transverse direction of the waterproof sheet 10, the waterproof sheet is simultaneously formed on the two sheet joining members 12B. 10 needs to be rolled and unfolded, but there is a time lag between applying the solvent to one sheet bonding member 12B and completing the application of the solvent to the other sheet bonding member 12B. This is because the adhesive strength is insufficient.

  In this case, in order to eliminate this time lag, it is desirable to dispose the disc-shaped sheet joining members 12 in a staggered manner in the traveling direction of the waterproof sheet 10 as shown in FIG. When arranged in a staggered manner in this manner, it is possible to perform a welding operation with a solvent for each individual disc-shaped sheet bonding member 12B, so there is no need to wait for the completion of the solvent application operation to the other sheet bonding members 12B. This is because the time lag from solvent application to welding is eliminated, and the work man-hours are unchanged and the efficiency can be maintained. In addition, the adhesive strength can be increased by performing the two-side coating of the solvent described above.

  Further, in this way, immediately after the waterproof sheet 10 is laid on the sheet bonding member 12B by passing over the sheet bonding member 12B, the disc-shaped sheet bonding member 12B is placed on the waterproof sheet 10 by the operator's hand. The waterproof sheet 10 is firmly fixed to the sheet bonding member 12 </ b> B by being pressed by, for example.

  Although it is desirable to perform this manual pressing operation as soon as possible after passing the waterproof sheet 10 over the sheet joining member 12B and at least 5 seconds or more, similarly, so that the welding strength by the solvent does not decrease, It is necessary to press the solvent component before it evaporates at the latest.

  In this case, with respect to the waterproof sheet 10 between the two sheet joining members 12B arranged in parallel in the lateral direction of the waterproof sheet 10, since the distance of the place where the waterproof sheet 10 is fixed is close and hardly contracted, The waterproof sheet 10 is laid while being stretched so as to push out the heel by hand so that it is not necessary to eliminate the heel. On the other hand, between the sheet joining members 12B in the longitudinal direction of the waterproof sheet 10, as described above, it is simply rolled while being pulled while applying tension so as not to cause wrinkles. There is no need to work. These operations can usually prevent wrinkles from forming on the waterproof sheet 10, but even if wrinkles occur, the waterproof sheet 10 shrinks as the number of days has elapsed since installation as described above. The wrinkles are resolved naturally.

  In the case where the waterproof sheet 10 is greatly meandered when unfolded by rolling, a large undulation (lifting) occurs in the overlapping portion 10A of the waterproof sheet 10, and a flaw that makes it difficult to weld the overlapping portion 10A occurs. After rewinding the waterproof sheet 10 to the position where wrinkles are generated, the work is restarted from that position again.

  Thereafter, this operation is repeated, and the waterproof sheet 10 is rolled and unfolded until reaching the belt-like sheet joining member 12A installed at the terminal opposite to the terminal at the starting end of the housing 1, and finally the waterproof sheet 10 Both ends (start end and end) are welded to the sheet joining member 12A of the terminal. At that time, a not-shown fall prevention mark such as a pole may be installed at a predetermined position before the end of the place where the waterproof sheet 10 should be laid, for example, at a position about 1 to 2 m before the end. desirable.

  The laying work of the waterproof sheet 10 is performed on the side of the waterproof sheet 10 in the traveling direction, the operator performing the work of rolling the waterproof sheet 10 and applying the solvent, and on the side opposite to the traveling direction of the waterproof sheet 10 and the sheet joining member 12B. Although it is desirable from the viewpoint of efficiency that it is performed by a set of two workers who perform welding work while holding down, in particular, the former worker often works backward from the laying end, With this mark, it is possible to grasp the distance to the terminal of the casing 1 of the structure, and it is possible to prevent the drop and ensure the safety of the operator even at a high place.

  The unfolding work by rolling the waterproof sheet 10 stops when the mark is reached, and after that, the waterproof sheet 10 is cut to secure a length that can reach the corner of the end of the waterproof sheet 10. Is welded to the sheet joining member 12A of the terminal. As shown in FIG. 1, these operations are repeated for each row, and the waterproof sheet 10 is laid on all the installation locations on the housing 1 to complete the operation.

(5. Thermal welding by high frequency)
Next, an embodiment in which the waterproof sheet 10 is thermally welded to the sheet joining member 12 by high frequency will be described with reference to FIG. 2, as shown in FIG. 2, similar to the embodiment in the case of the solvent shown in FIG. First, a part of one end of the roll-shaped waterproof sheet 10 is unwound, and the long side end portion (end surface in the longitudinal direction) of the waterproof sheet 10 is aligned with the guide line 14. Further, the straightness / street of the waterproof sheet 10 is confirmed.

  Next, the waterproof sheet 10 is rolled and unfolded so as to be pulled while applying a certain amount of tension so as not to cause wrinkles in the waterproof sheet 10. In this case, as shown in FIG. 2, in the case of high-frequency welding, unlike FIG. 1, the waterproof sheet 10 is rolled on the disk-shaped sheet joining member 12 </ b> B installed at a location excluding the terminal of the housing 1. The waterproof sheet 10 is laid on the sheet bonding member 12B by passing the sheet.

  However, on the other hand, as shown in FIG. 2, after the waterproof sheet 10 is rolled over the sheet bonding member 12, the rolling of the waterproof sheet 10 is temporarily stopped. Further, in this case, in order to avoid the influence of wind as much as possible, as shown in FIG. 2, the waterproof sheet 10 is rolled without expanding the waterproof sheet 10 to at least the installation position of the next sheet joining member 12B. It is desirable to pause.

  Thereafter, in the state shown in FIG. 2, a high frequency is applied to the sheet joining member 12B from above the waterproof sheet 10, and the waterproof sheet 10 is thermally welded and fixed to the sheet joining member 12B. Although there is no particular limitation on the method of heat welding by high frequency, for example, a high frequency head of a high frequency fusion machine (not shown) is pressed against the sheet bonding member 12B from the top of the waterproof sheet 10 to attach the waterproof sheet 10 to the sheet bonding member. It can be heat-welded to 12B.

  Thereafter, as in the case of welding with a solvent, this operation is repeated, and the waterproof sheet 10 is rolled until it reaches the belt-like sheet joining member 12A installed at the terminal opposite to the terminal at the starting end of the housing 1. Finally, both ends (start and end) of the waterproof sheet 10 are welded to the sheet joining member 12A of the terminal. As shown in FIG. 1, this operation is repeated for each row and is laid at all the installation locations on the housing 1 to complete the operation.

  Note that the scroll-shaped waterproof sheet 10 does not necessarily have to be prepared for each row shown in FIGS. 1 and 2. Each roll-shaped waterproof sheet 10 is rolled and unfolded and laid for each row. Can be used after cutting.

  Further, the joining of the waterproof sheet 10 and the sheet joining member 12 is not necessarily limited to that using the above-mentioned solvent or high frequency, and if necessary, the synthetic resin is melted and melted by other heating means. It is also possible to employ a heat-sealing method of attaching or a method of adhering using an adhesive.

  Next, an embodiment of the present invention in which it is confirmed whether wrinkles are naturally eliminated with the passage of days if the waterproof sheet 10 satisfies the above-described heat shrinkage rate will be described with reference to a comparative example. First, as an example of the present invention, a waterproof sheet 10 adjusted to have a heat shrinkage rate of 0.1% or more was set. The waterproof sheet 10 of this example is processed into a sheet having a thickness of 1.5 mm by extrusion molding. On the other hand, as a comparative example, a waterproof sheet having a heat shrinkage rate of less than 0.1% was set. The comparative example 1 had a thickness of 1.5 mm and the comparative example 2 had a thickness of 2.0 mm. These Comparative Examples 1 and 2 were laminate type (composite type) waterproof sheets formed by bonding a resin to a polyester or glass fiber base fabric.

  About these Example of this invention and Comparative Examples 1 and 2, in order to confirm the change of the length with the passage of time under heating, the waterproofing after heating for a predetermined time with respect to the length of the initial waterproofing sheet (at the time of laying) The rate of change in sheet length, that is, the rate of change after heating, was calculated as “length of waterproof sheet after heating for a predetermined time / initial length of waterproof sheet (when laid)”. In this case, the evaluation of the rate of change due to heating was performed in accordance with the items relating to the heat stretchable properties of “JIS A 6008” relating to the waterproof sheet.

  Specifically, after measuring the length of the test pieces of Examples and Comparative Examples of the present invention in units of 0.1 mm at the center, the test pieces were placed horizontally for 168 hours (7 days) under heating, and long every day. The thickness was measured at the same location, and the amount of expansion / contraction (mm) relative to the initial length was calculated.

  In this case, first, the result of examining the expansion / contraction ratio at 60 ° C. (the length of the waterproof sheet after heating for a predetermined time / the length of the initial waterproof sheet (when laid)) is shown in FIG. As a result, the wrinkles were resolved in the examples of the present invention that showed an expansion rate of -0.19% (0.19 as the contraction rate) after 1 day, but the expansion rate was -0.02% to- In the comparative example that was 0.04%, that is, the comparative example that showed only the expansion / contraction rate of 1/10000 unit, wrinkles remained without being eliminated until the end of the experiment. This is considered to be because the waterproof sheet having a shrinkage ratio of 1/10000 unit could hardly shrink and the shrinkage amount was too small to eliminate wrinkles.

  Next, FIG. 5 shows the results of examining the expansion / contraction ratio at 80 ° C. (the length of the waterproof sheet after heating for a predetermined time / the length of the initial (when laid) waterproof sheet) as in “JIS A 6008”. As a result, the wrinkle was solved for the examples of the present invention that showed an expansion rate of -0.43% (a shrinkage rate of 0.43) or more after 1 day, but the expansion rate was -0.02% to- In the comparative example that was 0.06%, that is, the comparative example that showed only the expansion / contraction rate of 1/1000 unit, the wrinkles remained without being eliminated until the end of the experiment.

  From the above, the lower limit of the heat shrinkage rate is preferably a 1/1000 unit shrinkage rate, that is, a heat shrinkage rate of 0.1% or more, and more desirably measured at 60 ° C. in the practice of the present invention. Of 0.19% or more, that is, 0.2% or more.

  Here, the “heating shrinkage rate” is grasped as follows. That is, the rate of expansion / contraction after heating of an object (waterproof sheet), that is, the ratio of expansion or contraction after heating, is “the length of the waterproof sheet after heating for a predetermined time / the length of the initial waterproof sheet (when laid)”. In the case of negative expansion, that is, contraction due to heating, the rate of contraction due to heating, that is, the contraction rate is specified by the above calculation method. Specifically, in an object that shrinks by heating, the heating shrinkage rate, which means how much it shrinks compared to the initial value, becomes a problem, and the negative shrinkage rate (Fig. 4 and the negative value (shown in FIG. 5) is a contraction rate, that is, a heating “shrinkage” rate.

  On the other hand, the upper limit of the heat shrinkage rate of the waterproof sheet is preferably 2% or less at the maximum as described above, but more desirably about 1.1% can be set as the upper limit. This is because the temperature of the waterproof sheet 10 laid on the roof in midsummer rises to about 80 ° C. when illuminated by direct sunlight, but if the linear expansion coefficient of the waterproof sheet 10 is 130 ppm, In the case of laying, the temperature difference between the laying time and the maximum temperature is about 80 ° C., and the waterproof sheet 10 is considered to expand by 130 ppm × 80 ° C. = 1.04% at the maximum from the laying time in winter. And conversely, if it can shrink about 1.04% by reheating and about 1.1% at maximum with a width, even if laid in midwinter, wrinkles will occur in midsummer. Because there is no.

  In this sense, the “heat shrinkage rate” in the present invention is 168 at 80 ° C. as in “JIS A 6008” so that wrinkles do not occur even when 80 ° C. considered to be the maximum temperature difference is considered. It means the heat shrinkage rate when heated for a time, the lower limit value is 0.1%, more preferably 0.2% or more, the upper limit value is 2% or less, preferably 1.1% or less. Can be prescribed. That is, the heat shrinkage rate of the waterproof sheet 10 is preferably in the range of 0.1% to 2%, more preferably in the range of 0.2% to 1.1%.

  Then, next, the expansion / contraction rate under various temperatures was confirmed about the Example of this invention which satisfy | fills said conditions. When the result is shown in FIG. 6, it did not show a sufficient shrinkage rate at 23 ° C. and around 40 ° C. close to normal temperature, but the heat shrinkage rate at a temperature of 60 ° C. or higher was about 0.2% to 1%. It was included in the range of 1%, and no matter what season it was laid, it was possible to eliminate wrinkles naturally after one summer when it reached at least 60 ° C.

  The present invention is particularly useful in places exposed to high temperatures such as roofs, verandas and balconies of business buildings such as office buildings and school buildings that are exposed to strong winds, and residential buildings such as condominiums. It can be widely applied to ensure waterproofness.

DESCRIPTION OF SYMBOLS 1 Housing | casing 10 Waterproof sheet 10A The overlapping part of a waterproof sheet 12 Sheet | seat joining member 14 Guideline

  The present invention is, for example, a waterproof sheet laying method in which a waterproof sheet is constructed by laying a waterproof sheet on a roof of a structure such as a building via a sheet joining member, and waterproofing that can be used in such a method. The present invention relates to improvement of a sheet, and in particular, relates to easily eliminating a wrinkle at the time of laying and securely laying it at a predetermined position so as to easily lay a waterproof sheet.

  For example, when waterproofing the roof of a structure such as an office building or a school, the waterproof sheet should not be directly bonded to the base of the structure, so that the cracks and vibrations of the housing, joint behavior, etc. In some cases, a so-called insulating method (mechanical fixing method) is employed, which is less affected by the above-mentioned and can ensure waterproofness in the event of an earthquake or the like.

  In this construction method, a sheet joining member made of a steel plate or the like whose surface is coated with a synthetic resin of the same quality as the waterproof sheet is used, and a sheet joining member having, for example, a belt-like shape is formed on the terminal of the casing of the structure. Installed at places other than the terminals, for example, sheet joining members having a disk shape are installed at a predetermined pitch, and these sheet joining members are attached to the housing with a fixture such as a nail, and then these sheets A waterproof sheet is laid from above the joining member, and the waterproof sheet is welded to and joined to a required sheet joining member, thereby fixing the waterproof sheet to the structural body via the sheet joining member.

  In this case, the welding of the waterproof sheet to the sheet joining member is conventionally performed by spreading the waterproof sheet and laying the entire surface including the place where the sheet joining member is installed, and then laying on the disk-shaped sheet joining member. The needle of the syringe is passed through the waterproof sheet, and a solvent is injected between the back surface of the waterproof sheet and the surface of the disc-shaped sheet joining member, or a plurality of belt-shaped waterproof sheets are attached to both ends in the longitudinal direction. After laying partially overlaid, a brush brush was inserted between the waterproof sheet and the housing, a solvent was applied to the disk-shaped sheet joining member, and the waterproof sheet was welded to the sheet joining member (for example, , See Patent Documents 1 to 3).

  However, in these conventional methods, when the waterproof sheet is rolled and unfolded, there is a problem that the waterproof sheet is laid with wrinkles if there is no skill of the operator. In particular, since the waterproof sheet is fixed to the sheet bonding member at a predetermined location by welding or the like, and the portion bonded to the sheet bonding member cannot be displaced, it is very difficult to eliminate wrinkles after welding. In addition, as a result of requiring careful and careful work, work efficiency is lowered, and as a result, there may be a problem that it takes days for construction.

  In addition to preventing wrinkles, it is not always easy for a waterproof sheet to be rolled and deployed to an appropriate predetermined position unless it is a skilled worker. Or, the waterproof sheet may be laid in a meandering state. Since these corrections require work that is very time-consuming, such as unwinding the waterproof sheet, the situation is similarly undesirable from the viewpoint of work efficiency.

  On the other hand, it is absolutely necessary to avoid negligence in ensuring safety due to the need to reduce work efficiency and work time. In particular, waterproof sheets are laid on a relatively high place such as the rooftop. Therefore, it is necessary to fully consider the drop.

Japanese Examined Patent Publication No. 58-036705 JP-A-8-246609 Japanese Patent Laid-Open No. 11-200563

  In view of the above-mentioned problems, the problem to be solved by the present invention is to easily eliminate wrinkles at the time of laying and to easily and securely place a waterproof sheet in a predetermined position without depending only on the skill of an operator. It is an object of the present invention to provide a waterproof sheet laying method capable of easily and safely achieving proper laying of a waterproof sheet by laying on the waterproof sheet, and a waterproof sheet usable for such a method.

(1. Installation method of waterproof sheet)
The present invention provides, as a first means for solving the above problems, there is provided an installation method of the waterproof sheet laid and fixed to the sheet bonding member disposed waterproof sheet precursor structure, as the waterproof sheet 70 Use a waterproof sheet with a heat shrinkage of 0.35 % or more when heated at ℃ , roll the roll-shaped waterproof sheet to the installation location, and deploy the waterproof sheet to each installation location of the sheet bonding member The present invention provides a method for laying a waterproof sheet, which is laid while being joined to a member.

As a second means for solving the above-mentioned problems, the present invention provides a waterproof sheet laying method in which a waterproof sheet is fixed and laid on a sheet joining member installed on a structural body. Use a waterproof sheet with a heat shrinkage of 0.43% or more when heated at ℃ for 24 hours, roll the roll-shaped waterproof sheet to the installation location, and deploy the waterproof sheet for each installation location of the sheet joining member The present invention provides a method for laying a waterproof sheet, which is laid while being joined to a sheet joining member.

As a third means for solving the above-mentioned problems, the present invention provides a waterproof sheet laying method in which a waterproof sheet is fixed and laid on a sheet joining member installed on a structural body. Use a waterproof sheet with a heat shrinkage of 0.62% or more when heated at 168 ° C., roll the roll-shaped waterproof sheet to the installation location, and deploy a waterproof sheet for each installation location of the sheet joining member The present invention provides a method for laying a waterproof sheet, which is laid while being joined to a sheet joining member.

In addition, as a fourth means for solving the above-described problems, the present invention provides a heat shrinkage ratio when the waterproof sheet is heated at 80 ° C. for 168 hours in any of the first to third solving means. A waterproof sheet laying method characterized by using a waterproof sheet of 2% or less is provided.

According to the present invention, as a fifth means for solving the above-described problems, in any one of the first to fourth solving means, the waterproof sheet is processed into a sheet shape by extrusion molding. A method for laying a sheet is provided.

The present invention provides, as a sixth means for solving the above-mentioned problems, in any one of the first to fifth solving means, a guideline corresponding to a place where the waterproof sheet should be laid is installed, and the waterproof sheet is provided. The present invention provides a method for laying a waterproof sheet characterized by rolling and unfolding according to a guideline.

According to the present invention, as a seventh means for solving the above-described problem, in the first to sixth solving means, a waterproof sheet having a long end face having linearity is used. A waterproof sheet laying method characterized by the above is provided.

As an eighth means for solving the above-mentioned problems, the present invention provides a waterproof sheet according to any one of the first to seventh solutions, wherein the sheet is coated with a synthetic resin of the same quality as the waterproof sheet. When welding to the joining member with a solvent and joining and fixing to the sheet joining member, the solvent is applied not only to the surface of the sheet joining member but also to the portion of the waterproof sheet that overlaps the sheet joining member. A method of laying a waterproof sheet is provided.

The present invention provides a ninth means for solving the above-mentioned problems, in any one of the first to eighth solving means described above, when the waterproof sheet is dropped to a predetermined position from the end of the place where the waterproof sheet is to be laid. The present invention provides a method for laying a waterproof sheet, characterized by installing a mark for prevention.

(2. Waterproof sheet)
The present invention also provides the following waterproof sheet that can be used in any one of the first to ninth solutions. That is, the present invention provides, as a tenth means for solving the above-described problem, a waterproof sheet that is fixed to a sheet joining member installed in a structural body and laid on the structure, and is The present invention provides a waterproof sheet characterized by having a heat shrinkage rate of 0.35 % or more when heated.

As an eleventh means for solving the above-mentioned problems, the present invention is a waterproof sheet that is fixed to a sheet joining member installed on a structural body and laid on the structure, and is 24 ° C. at 24 ° C. It is intended to provide a waterproof sheet characterized by having a heat shrinkage rate of 0.43% or more when heated for a period of time.

As a twelfth means for solving the above-mentioned problems, the present invention is a waterproof sheet that is fixed to a sheet joining member installed in a structural body and laid on the structure, and is 168 ° C. at 168 ° C. It is intended to provide a waterproof sheet characterized by having a heat shrinkage of 0.62% or more when heated for a period of time.

As a thirteenth means for solving the above problems, the present invention has a heating shrinkage rate of 2% or less when heated at 80 ° C. for 168 hours in any one of the tenth to twelfth solving means. The waterproof sheet characterized by this is provided.

As a fourteenth means for solving the above-mentioned problems, the present invention provides a waterproof sheet which is processed into a sheet shape by extrusion molding in any one of the tenth to thirteenth solving means. It is to provide.

The present invention provides, as a fifteenth means for solving the above-described problems, a waterproof sheet according to any one of the tenth to fourteenth solving means, wherein the end face of the long side has linearity. is there.

According to the present invention, as described above, the waterproof sheet is a waterproof sheet having a heat shrinkage rate of a predetermined value or more, that is, a waterproof sheet that shrinks (shrinks) by heating, and the shrinkage ratio, that is, heat shrinkage. As the rate is higher than the predetermined value , the waterproof sheet is laid at a location where the temperature rises to about 80 ° C in the summer, especially in the direct sunlight, as will be understood from the examples described later. Therefore, even if the waterproof sheet is laid in a state where some wrinkles occur, the temperature rises with the passage of time after laying, that is, due to heating, the waterproof sheet shrinks and wrinkles are naturally eliminated. , Without relying only on the skill of the operator, can easily eliminate wrinkles, can easily realize the appropriate installation of waterproof sheets, and greatly improve the work efficiency It is possible There is a practical benefit.

On the other hand, according to the present invention, as described above, a waterproof sheet having a heat shrinkage rate of 2% or less when heated at 80 ° C. for 168 hours is used as the upper limit value. The tensile stress generated by the contraction of the sheet concentrates on the corner of the terminal of the housing, and the belt-like sheet bonding member installed on the terminal floats or comes off from the structural housing. There is a practical advantage that a waterproof sheet can be appropriately laid.

  In addition, according to the present invention, as described above, for example, a guideline corresponding to a location where a waterproof sheet should be laid is installed by inking, and the waterproof sheet is rolled and expanded in accordance with this guideline. Therefore, there is an advantage that the waterproof sheet can be appropriately laid at a predetermined position.

  Furthermore, as described above, the present invention uses a waterproof tote with a long end face having linearity, so that the waterproof sheet can be installed in a predetermined straight line at an appropriate position. For this reason, there is an advantage that the waterproof sheet can be prevented from being displaced from a predetermined position, meandering or curved.

  Similarly, according to the present invention, as described above, when bonding and fixing to the sheet bonding member, the solvent is applied not only to the surface of the sheet bonding member but also to the portion of the waterproof sheet that overlaps the sheet bonding member. Since it is applied and welded, the adhesiveness of the solvent is increased as compared with the case where the welding is applied only to the sheet joining member, and there is an advantage that the waterproof sheet can be firmly fixed to the sheet joining member.

  In addition, according to the present invention, as described above, for example, since a mark for preventing a fall such as a pole is installed at a predetermined position in front of the end of the place where the waterproof sheet is to be laid, When rolling and unpacking a roll-shaped waterproof sheet or welding to a sheet joining member, the work is often done in a backward direction with respect to the laying end. There is an actual advantage that it is possible to ensure the safety of the worker by preventing the fall even at a high place.

It is a top view of the state which implements embodiment using a solvent in the laying method of the waterproof sheet of this invention. It is a top view of the state which implements embodiment using a high frequency in the laying method of the waterproof sheet of this invention. It is a top view of other embodiment of the laying method of the waterproof sheet of the present invention. It is a figure which shows the expansion-contraction rate in 60 degreeC of the Example and comparative example of the waterproof sheet of this invention. It is a figure which shows the expansion-contraction rate in 80 degreeC of the Example and comparative example of the waterproof sheet of this invention. It is a figure which shows the expansion-contraction rate in the various temperature of the Example of the waterproof sheet of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a state in which a method for laying a waterproof sheet 10 according to the present invention is carried out. The method for laying a waterproof sheet 10 is to fix a waterproof sheet 10 to a sheet joining member 12 installed on a housing 1 of a structure. It is to be laid. That is, by fixing the waterproof sheet 10 via the sheet joining member 12 without fixing the waterproof sheet 10 directly to the casing 1, it is a laying method that is less affected by cracks, vibration, joint behavior, and the like of the casing 1. is there.

  Examples of structures on which the waterproof sheet 10 is laid include roofs, verandas, balconies, and the like of business buildings such as office buildings and school buildings, and residential buildings such as apartments. The present invention can be applied to these structures requiring waterproofness.

(1. Sheet joining member)
In this case, first, as shown in FIG. 1, a band-shaped sheet joining member 12A is installed at a terminal (edge) on a housing 1 such as a roof of a structure, and a disk-shaped member is provided at a location other than the terminal. The sheet joining members 12B are installed at a predetermined pitch. In this case, these sheet joining members 12 are fixedly attached to the housing 1 by a fixing tool such as a nail or a bolt (not shown).

  In addition, as shown in FIGS. 1 and 2, the disk-shaped sheet bonding member 12 </ b> B installed at a location other than the terminal of the housing 1 has two sheet bonding members 12 </ b> B arranged in parallel in the transverse direction of the waterproof sheet 10. And this can be arranged and arranged in multiple rows in the deployment direction (longitudinal direction) of the waterproof sheet 10. However, the present invention is not limited to this configuration, and as shown in FIG. 3, the disk-shaped sheet joining members 12B are arranged in a staggered manner in a staggered manner rather than in parallel in the transverse direction of the waterproof sheet 10. You can also. However, it is necessary to set the disc-shaped sheet joining member 12B so as to be disposed at a place other than the overlapping portion 10A of the waterproof sheet 10 as shown in FIGS.

  These sheet joining members 12 are not particularly limited in shape and size, and can be made to have any shape and size adapted to the installation location. For example, as shown in FIG. 1, when installing in the terminal of the housing 1, it forms in plate shapes, such as a substantially L shape and a strip | belt shape, and when installing in the location except the terminal of the housing 1 Can be installed in a disc-like shape having a circular shape or the like and scattered on the housing 1.

  Moreover, since these sheet | seat joining members 12 are joined with the waterproof sheet 10 on the surface, they are formed so that they can be welded to the waterproof sheet 10 with a solvent or a high frequency described later. That is, the sheet joining member 12 is formed from an aspect that can be welded to the waterproof sheet 10, specifically, a synthetic resin plate, a synthetic resin-coated steel plate having a surface coated with a synthetic resin as a steel plate, and the like. be able to. Examples of the steel plate include stainless steel in consideration of its corrosion resistance and the like.

  On the other hand, as the synthetic resin used for the sheet bonding member 12 and the coating material on the surface thereof, for example, a soft synthetic resin such as polyvinyl chloride resin, polyolefin resin, ethylene vinyl acetate copolymer, or synthetic rubber type resin can be used. The material can be selected, but among them, polyvinyl chloride resin is particularly preferable because it is excellent in solvent weldability and heat fusion property. The sheet joining member 12 can be formed by pressing with a press molding machine or the like when formed from a synthetic resin-coated steel sheet, and can be appropriately formed by injection molding or the like when formed as a synthetic resin plate. The resin processing method can be used.

(2. Installation of waterproof sheets)
After the sheet joining member 12 is installed on the housing 1 as described above, the waterproof sheet 10 wound up in the form of a roll is rolled and deployed at the installation location as shown in FIG. For this reason, the remaining waterproof sheet 10 that has not yet been laid is not blown by the wind and can be laid even under strong winds. In this case, as shown in FIG. 1, the waterproof sheet 10 is generally formed in a long band shape. However, a plurality of waterproof sheets 10 are prepared according to the installation location, and the plurality of waterproof sheets 10 are arranged at the end in the longitudinal direction. Lay down while partially overlapping parts to ensure waterproofness. The overlapping portions 10A of the plurality of waterproof sheets 10 can be welded to each other after laying or in parallel with laying by a heat welding machine (not shown) or the like.

  When the preventive sheet 10 is rolled out, it can be laid from the first row of waterproof sheets 10 (the uppermost waterproof sheet 10 in FIGS. 1 and 2) closest to the terminal. In order to secure the access and work location from the terminal, and to perform the waterproof construction on the terminal as a finish, it is preferable to lay from the waterproof sheet 10 in the second row from the terminal side of the housing 1. At that time, unlike the waterproof sheet 10 closest to the terminal, the guideline for laying is difficult to understand. Therefore, in the present invention, as shown in FIG. To do. Accordingly, at the same time, when the waterproof sheet 10 is laid along the terminal (wall surface) from the first row of waterproof sheets 10 closest to the terminal (wall surface), the terminal itself to which the waterproof sheet 10 should be aligned is linear. If it does not have, the straightness of the waterproof sheet 10 cannot be ensured, so that the straightness of the waterproof sheet 10 is ensured without being affected by the linearity accuracy of such a terminal. The merit which can be secured also arises.

  The guideline 14 is not particularly limited as long as it is a guide when laying, but the guideline 14 can be obtained by placing a linear member such as inking or string or string. In this case, in order to secure a waterproof finish portion from the wall surface to the floor surface of the terminal, and taking into account the width (50 mm) of the overlapping portion 10A of the waterproof sheet 10, a substantially L-shape installed at the terminal of the housing 1 The guide line 14 is installed at a position on the inner side of the sheet width -30 mm of the waterproof sheet 10 from the corner of the sheet-like sheet joining member 12 </ b> A such as a belt shape. For example, when a waterproof sheet having a width of 1260 mm is laid, the guide line 14 is set at a position 1230 mm from the corner of the entrance.

  In addition, first, the roll-shaped waterproof sheet 10 is unwound by about 1 to 2 m, and the end face in the longitudinal direction (long side) of the waterproof sheet 10 is aligned with the guideline. After confirming, it rolls along this guideline 14 and develops. Thereby, the waterproof sheet 10 can be appropriately laid in a predetermined position. In addition, when the end surface of the longitudinal direction of the waterproof sheet 10 deviates from the guideline 14, the both ends of the roll-shaped waterproof sheet 10 are lifted to correct the direction. This is because if only one side of the waterproof sheet 10 is lifted and corrected, it causes wrinkles.

  When laying the second and subsequent waterproof sheets 10, a wrap line of 50 mm or more (a portion to be the overlapping portion 10) is provided on the adjacent waterproof sheet 10 already laid, and this is used as a guideline 14. , Continue laying work.

  Further, in this case, in particular, the sheet bonding member 12 is not bonded to the sheet bonding member 12 after unwinding all of the waterproof sheets 10 and laying the entire area on the installation site. It is desirable that the waterproof sheet 10 is rolled and deployed and laid while the waterproof sheet 10 is bonded to the sheet bonding member 12 for each installation location. That is, the laying operation of the waterproof sheet 10 and the welding operation to the sheet joining member 12B are performed in parallel.

  For this reason, first, since the welding work can be performed without waiting for the spread of the waterproof sheet 10 as well as the number of work steps, the work time can be shortened and the waterproof sheet 10 is rolled and unfolded. Since it is possible to work only by the workers for the work and the welding work, it is possible to work by 2 to 3 people, reducing the number of workers, and laying the waterproof sheet 10 efficiently.

  At the same time, as shown in FIG. 1, the waterproof sheet 10 is already fixed to the sheet bonding member 12 in the portion of the waterproof sheet 10 laid on the sheet bonding member 12 </ b> B, and the waterproof sheet 10 is laid in a free state. Since there is no place where the waterproof sheet 10 is provided, the waterproof sheet 10 does not swell or rise, and the laying operation can be performed appropriately and efficiently even under strong winds.

(3. Structure of waterproof sheet)
As for the material of the waterproof sheet 10 to be laid, it can be used without particular limitation as long as it is a waterproof resin sheet. For example, a polyvinyl chloride resin, Soft synthetic resins such as polyolefin resins and ethylene vinyl acetate copolymers, and those formed from synthetic rubber materials can be used. Among them, in particular, polyvinyl chloride resin is solvent-welded. It is preferable to use the same material as the surface of the sheet joining member 12.

  In the present invention, the waterproof sheet 10 having a heat shrinkage rate of 0.1% or more is used as the waterproof sheet 10. That is, in the present invention, a waterproof sheet that shrinks, that is, shrinks when heated, and a waterproof sheet 10 that has a shrinkage ratio, that is, a lower limit of a heat shrinkage rate of 0.1% or more is used. Is.

  As can be seen from the examples described later, the waterproof sheet 10 is laid at a location where the temperature rises when exposed to direct sunlight, such as on the rooftop, so that the waterproof sheet 10 is in a state where some wrinkles occur. If the waterproof sheet 10 has a heat shrinkage ratio of 0.1% or more, that is, shrinks at a rate of 1/1000 unit even when laid, the temperature rises with the passage of time after laying, that is, by heating. This is because the waterproof sheet 10 is shrunk and wrinkles are naturally eliminated without particularly performing any correction work. For this reason, if the waterproof sheet 10 of the present invention is used, it is possible to eliminate wrinkles very easily without relying only on the skill of the operator, and it is easy to properly lay the waterproof sheet 10. It can be realized and work efficiency can be greatly improved. In particular, it is useful in that it is possible to perform appropriate laying work even if not a so-called skilled craftsman.

  Such a waterproof sheet 10 can be formed by processing into a sheet form by extrusion molding. Specifically, after the waterproof sheet 10 is processed into a rubber-like shape by melting a raw material such as polyvinyl chloride resin, it is passed through a plurality of rolls (not shown) arranged at regular intervals while pulling it. The sheet is formed while being controlled to a predetermined thickness, and then cooled and molded. At this time, since the waterproof sheet 10 is formed by cooling while being pulled, the stress applied to the waterproof sheet 10 at the time of pulling remains in the waterproof sheet 10 as a molded product as distortion. When the sheet is reheated (when exposed to direct sunlight or the like), the strain that has been pulled is released in the direction of contraction, so that the waterproof sheet 10 naturally contracts.

  In the present invention, the shrinkage ratio, that is, the heat shrinkage rate is 0.1%, that is, the tensile strength and speed so that the tensile stress at the time of molding remains in the waterproof sheet 10 as distortion, The cooling temperature is set. As described above, the heat shrinkage rate of 0.1% or more is, in one case, when the wrinkle is generated in the waterproof sheet 10, when the state is verified, it is locally about 0.1%. Since it was found that wrinkles occur when the difference in length occurs, conversely, if the heat shrinkage rate is 0.1% or more, the difference in length is eliminated and wrinkles disappear. This is because the. Moreover, when the heat shrinkage rate and the elimination of wrinkles were demonstrated based on this consideration, as shown in the examples described later, the waterproof sheet having a heat shrinkage rate of actually less than 0.1% (1 / 10,000 order). However, if the waterproof sheet 10 having a heat shrinkage rate of 0.1% or more (1/1000 order to 1/100 order) is not able to eliminate wrinkles, wrinkles will be eliminated with the passage of days. This is because it was confirmed.

  On the other hand, the upper limit value of the heat shrinkage rate of the waterproof sheet 10 is rather technically more difficult to form the waterproof sheet 10 having a heat shrinkage rate that is too high, such as 5%. Since the upper limit value (limit) of the shrinkage rate is inevitably determined, it is not always necessary to set the upper limit as the scope of the invention, but it is desirable to set it to 2% or less at the maximum. This is because when the heat shrinkage rate is 2% or more, the waterproof sheet 10 contracts more than necessary, and the tensile stress generated by the contraction of the waterproof sheet 10 concentrates on the corner of the terminal of the housing 1, This is because there is a possibility that the sheet joining member 12A such as a belt-like shape installed on the floor may float or come off from the housing 1 of the structure.

  In the present invention, as the waterproof sheet 10, the long side (longitudinal direction) end face has linearity. This is because, if the waterproof sheet 10 has linearity, the waterproof sheet 10 can be installed in a predetermined straight line at an appropriate position. Therefore, the waterproof sheet 10 may deviate from the predetermined position, meander or bend. This is to prevent them from being arranged.

  Here, “linearity” refers to the side surface in the longitudinal direction (long side) of the waterproof sheet 10 with reference to a string in which both ends (start and end) in the longitudinal direction of the waterproof sheet 10 having a length of 10 m are linearly connected. However, it means that the distance at the maximum distance from the reference string is within 15 mm, preferably within 10 mm. This is because even when the waterproof sheet 10 is processed into a predetermined shape set at the time of molding, an external mechanical or thermal force is applied at the time of subsequent winding, storage or transportation. As a result, since distortion may occur and the sheet may be deformed, such a waterproof sheet 10 is excluded. On the other hand, if the deformation is within this range, there will be no significant influence upon laying. In addition, when transporting and storing, the roll-shaped waterproof sheet 10 may be deformed when stacked and stacked, and when rolled and unfolded, a curl may remain. It is necessary to. The method for fixing the waterproof sheet 10 to the sheet joining member 12 is not particularly limited, and examples thereof include welding with a commonly used solvent and heat welding with high frequency.

(4. Welding with solvent)
In the method of the present invention described above, an embodiment in which the waterproof sheet 10 is bonded to the sheet bonding member 14 with a solvent will be described with reference to FIG. 1. First, as shown in FIG. One end of 10 is unwound, and the long side end portion (end surface in the longitudinal direction) of the waterproof sheet 10 is aligned with the guide line 14. Further, the straightness / street of the waterproof sheet 10 is confirmed.

  Next, the waterproof sheet 10 is rolled and unfolded so as to be pulled while applying a certain amount of tension so as not to cause wrinkles in the waterproof sheet 10. In this case, as shown in FIG. 1, when the waterproof sheet 10 is rolled and unfolded to the front of the disk-shaped sheet joining member 12 </ b> B installed at a location excluding the terminal of the housing 1, the temporary rolling is stopped. Then, a brush brush (not shown) is inserted between the scroll-shaped waterproof sheet 10 and the casing 1 so as to insert not only the surface of the sheet joining member 12B but also the waterproof sheet 10 in the present invention. After the solvent is also applied to the portion overlapping the sheet bonding member 12B, the waterproof sheet 10 is immediately immediately rolled again over the sheet bonding member 12B coated with the solvent. That is, in the present invention, the solvent is applied to the two surfaces of the sheet bonding member 12 </ b> B and the waterproof sheet 10.

  It is desirable that the waterproof sheet 10 is rolled and passed over the sheet bonding member 12B as soon as possible after the solvent is applied to the sheet bonding member 12B. However, as much as possible so that the welding strength by the solvent does not decrease. It is necessary to pass the waterproof sheet 10 over the sheet joining member 12B before the solvent component is volatilized. In particular, in the summer, the solvent is applied to the heated sheet joining member 12B. This is because the adhesive strength may be insufficient quickly.

  Further, as in the embodiment shown in FIGS. 1 and 2, when two sheet joining members 12B are arranged in parallel in the transverse direction of the waterproof sheet 10, the waterproof sheet is simultaneously formed on the two sheet joining members 12B. 10 needs to be rolled and unfolded, but there is a time lag between applying the solvent to one sheet bonding member 12B and completing the application of the solvent to the other sheet bonding member 12B. This is because the adhesive strength is insufficient.

  In this case, in order to eliminate this time lag, it is desirable to dispose the disc-shaped sheet joining members 12 in a staggered manner in the traveling direction of the waterproof sheet 10 as shown in FIG. When arranged in a staggered manner in this manner, it is possible to perform a welding operation with a solvent for each individual disc-shaped sheet bonding member 12B, so there is no need to wait for the completion of the solvent application operation to the other sheet bonding members 12B. This is because the time lag from solvent application to welding is eliminated, and the work man-hours are unchanged and the efficiency can be maintained. In addition, the adhesive strength can be increased by performing the two-side coating of the solvent described above.

  Further, in this way, immediately after the waterproof sheet 10 is laid on the sheet bonding member 12B by passing over the sheet bonding member 12B, the disc-shaped sheet bonding member 12B is placed on the waterproof sheet 10 by the operator's hand. The waterproof sheet 10 is firmly fixed to the sheet bonding member 12 </ b> B by being pressed by, for example.

  Although it is desirable to perform this manual pressing operation as soon as possible after passing the waterproof sheet 10 over the sheet joining member 12B and at least 5 seconds or more, similarly, so that the welding strength by the solvent does not decrease, It is necessary to press the solvent component before it evaporates at the latest.

  In this case, with respect to the waterproof sheet 10 between the two sheet joining members 12B arranged in parallel in the lateral direction of the waterproof sheet 10, since the distance of the place where the waterproof sheet 10 is fixed is close and hardly contracted, The waterproof sheet 10 is laid while being stretched so as to push out the heel by hand so that it is not necessary to eliminate the heel. On the other hand, between the sheet joining members 12B in the longitudinal direction of the waterproof sheet 10, as described above, it is simply rolled while being pulled while applying tension so as not to cause wrinkles. There is no need to work. These operations can usually prevent wrinkles from forming on the waterproof sheet 10, but even if wrinkles occur, the waterproof sheet 10 shrinks as the number of days has elapsed since installation as described above. The wrinkles are resolved naturally.

  In the case where the waterproof sheet 10 is greatly meandered when unfolded by rolling, a large undulation (lifting) occurs in the overlapping portion 10A of the waterproof sheet 10, and a flaw that makes it difficult to weld the overlapping portion 10A occurs. After rewinding the waterproof sheet 10 to the position where wrinkles are generated, the work is restarted from that position again.

  Thereafter, this operation is repeated, and the waterproof sheet 10 is rolled and unfolded until reaching the belt-like sheet joining member 12A installed at the terminal opposite to the terminal at the starting end of the housing 1, and finally the waterproof sheet 10 Both ends (start end and end) are welded to the sheet joining member 12A of the terminal. At that time, a not-shown fall prevention mark such as a pole may be installed at a predetermined position before the end of the place where the waterproof sheet 10 should be laid, for example, at a position about 1 to 2 m before the end. desirable.

  The laying work of the waterproof sheet 10 is performed on the side of the waterproof sheet 10 in the traveling direction, the operator performing the work of rolling the waterproof sheet 10 and applying the solvent, and on the side opposite to the traveling direction of the waterproof sheet 10 and the sheet joining member 12B. Although it is desirable from the viewpoint of efficiency that it is performed by a set of two workers who perform welding work while holding down, in particular, the former worker often works backward from the laying end, With this mark, it is possible to grasp the distance to the terminal of the casing 1 of the structure, and it is possible to prevent the drop and ensure the safety of the operator even at a high place.

  The unfolding work by rolling the waterproof sheet 10 stops when the mark is reached, and after that, the waterproof sheet 10 is cut to secure a length that can reach the corner of the end of the waterproof sheet 10. Is welded to the sheet joining member 12A of the terminal. As shown in FIG. 1, these operations are repeated for each row, and the waterproof sheet 10 is laid on all the installation locations on the housing 1 to complete the operation.

(5. Thermal welding by high frequency)
Next, an embodiment in which the waterproof sheet 10 is thermally welded to the sheet joining member 12 by high frequency will be described with reference to FIG. 2, as shown in FIG. 2, similar to the embodiment in the case of the solvent shown in FIG. First, a part of one end of the roll-shaped waterproof sheet 10 is unwound, and the long side end portion (end surface in the longitudinal direction) of the waterproof sheet 10 is aligned with the guide line 14. Further, the straightness / street of the waterproof sheet 10 is confirmed.

  Next, the waterproof sheet 10 is rolled and unfolded so as to be pulled while applying a certain amount of tension so as not to cause wrinkles in the waterproof sheet 10. In this case, as shown in FIG. 2, in the case of high-frequency welding, unlike FIG. 1, the waterproof sheet 10 is rolled on the disk-shaped sheet joining member 12 </ b> B installed at a location excluding the terminal of the housing 1. The waterproof sheet 10 is laid on the sheet bonding member 12B by passing the sheet.

  However, on the other hand, as shown in FIG. 2, after the waterproof sheet 10 is rolled over the sheet bonding member 12, the rolling of the waterproof sheet 10 is temporarily stopped. Further, in this case, in order to avoid the influence of wind as much as possible, as shown in FIG. 2, the waterproof sheet 10 is rolled without expanding the waterproof sheet 10 to at least the installation position of the next sheet joining member 12B. It is desirable to pause.

  Thereafter, in the state shown in FIG. 2, a high frequency is applied to the sheet joining member 12B from above the waterproof sheet 10, and the waterproof sheet 10 is thermally welded and fixed to the sheet joining member 12B. Although there is no particular limitation on the method of heat welding by high frequency, for example, a high frequency head of a high frequency fusion machine (not shown) is pressed against the sheet bonding member 12B from the top of the waterproof sheet 10 to attach the waterproof sheet 10 to the sheet bonding member. It can be heat-welded to 12B.

  Thereafter, as in the case of welding with a solvent, this operation is repeated, and the waterproof sheet 10 is rolled until it reaches the belt-like sheet joining member 12A installed at the terminal opposite to the terminal at the starting end of the housing 1. Finally, both ends (start and end) of the waterproof sheet 10 are welded to the sheet joining member 12A of the terminal. As shown in FIG. 1, this operation is repeated for each row and is laid at all the installation locations on the housing 1 to complete the operation.

  Note that the scroll-shaped waterproof sheet 10 does not necessarily have to be prepared for each row shown in FIGS. 1 and 2. Each roll-shaped waterproof sheet 10 is rolled and unfolded and laid for each row. Can be used after cutting.

  Further, the joining of the waterproof sheet 10 and the sheet joining member 12 is not necessarily limited to that using the above-mentioned solvent or high frequency, and if necessary, the synthetic resin is melted and melted by other heating means. It is also possible to employ a heat-sealing method of attaching or a method of adhering using an adhesive.

  Next, an embodiment of the present invention in which it is confirmed whether wrinkles are naturally eliminated with the passage of days if the waterproof sheet 10 satisfies the above-described heat shrinkage rate will be described with reference to a comparative example. First, as an example of the present invention, a waterproof sheet 10 adjusted to have a heat shrinkage rate of 0.1% or more was set. The waterproof sheet 10 of this example is processed into a sheet having a thickness of 1.5 mm by extrusion molding. On the other hand, as a comparative example, a waterproof sheet having a heat shrinkage rate of less than 0.1% was set. The comparative example 1 had a thickness of 1.5 mm and the comparative example 2 had a thickness of 2.0 mm. These Comparative Examples 1 and 2 were laminate type (composite type) waterproof sheets formed by bonding a resin to a polyester or glass fiber base fabric.

  About these Example of this invention and Comparative Examples 1 and 2, in order to confirm the change of the length with the passage of time under heating, the waterproofing after heating for a predetermined time with respect to the length of the initial waterproofing sheet (at the time of laying) The rate of change in sheet length, that is, the rate of change after heating, was calculated as “length of waterproof sheet after heating for a predetermined time / initial length of waterproof sheet (when laid)”. In this case, the evaluation of the rate of change due to heating was performed in accordance with the items relating to the heat stretchable properties of “JIS A 6008” relating to the waterproof sheet.

  Specifically, after measuring the length of the test pieces of Examples and Comparative Examples of the present invention in units of 0.1 mm at the center, the test pieces were placed horizontally for 168 hours (7 days) under heating, and long every day. The thickness was measured at the same location, and the amount of expansion / contraction (mm) relative to the initial length was calculated.

  In this case, first, the result of examining the expansion / contraction ratio at 60 ° C. (the length of the waterproof sheet after heating for a predetermined time / the length of the initial waterproof sheet (when laid)) is shown in FIG. As a result, the wrinkles were resolved in the examples of the present invention that showed an expansion rate of -0.19% (0.19 as the contraction rate) after 1 day, but the expansion rate was -0.02% to- In the comparative example that was 0.04%, that is, the comparative example that showed only the expansion / contraction rate of 1/10000 unit, wrinkles remained without being eliminated until the end of the experiment. This is considered to be because the waterproof sheet having a shrinkage ratio of 1/10000 unit could hardly shrink and the shrinkage amount was too small to eliminate wrinkles.

  Next, FIG. 5 shows the results of examining the expansion / contraction ratio at 80 ° C. (the length of the waterproof sheet after heating for a predetermined time / the length of the initial (when laid) waterproof sheet) as in “JIS A 6008”. As a result, the wrinkle was solved for the examples of the present invention that showed an expansion rate of -0.43% (a shrinkage rate of 0.43) or more after 1 day, but the expansion rate was -0.02% to- In the comparative example that was 0.06%, that is, the comparative example that showed only the expansion / contraction rate of 1/1000 unit, the wrinkles remained without being eliminated until the end of the experiment.

  From the above, the lower limit of the heat shrinkage rate is preferably a 1/1000 unit shrinkage rate, that is, a heat shrinkage rate of 0.1% or more, and more desirably measured at 60 ° C. in the practice of the present invention. Of 0.19% or more, that is, 0.2% or more.

  Here, the “heating shrinkage rate” is grasped as follows. That is, the rate of expansion / contraction after heating of an object (waterproof sheet), that is, the ratio of expansion or contraction after heating, is “the length of the waterproof sheet after heating for a predetermined time / the length of the initial waterproof sheet (when laid)”. In the case of negative expansion, that is, contraction due to heating, the rate of contraction due to heating, that is, the contraction rate is specified by the above calculation method. Specifically, in an object that shrinks by heating, the heating shrinkage rate, which means how much it shrinks compared to the initial value, becomes a problem, and the negative shrinkage rate (Fig. 4 and the negative value (shown in FIG. 5) is a contraction rate, that is, a heating “shrinkage” rate.

  On the other hand, the upper limit of the heat shrinkage rate of the waterproof sheet is preferably 2% or less at the maximum as described above, but more desirably about 1.1% can be set as the upper limit. This is because the temperature of the waterproof sheet 10 laid on the roof in midsummer rises to about 80 ° C. when illuminated by direct sunlight, but if the linear expansion coefficient of the waterproof sheet 10 is 130 ppm, In the case of laying, the temperature difference between the laying time and the maximum temperature is about 80 ° C., and the waterproof sheet 10 is considered to expand by 130 ppm × 80 ° C. = 1.04% at the maximum from the laying time in winter. And conversely, if it can shrink about 1.04% by reheating and about 1.1% at maximum with a width, even if laid in midwinter, wrinkles will occur in midsummer. Because there is no.

  In this sense, the “heat shrinkage rate” in the present invention is 168 at 80 ° C. as in “JIS A 6008” so that wrinkles do not occur even when 80 ° C. considered to be the maximum temperature difference is considered. It means the heat shrinkage rate when heated for a time, the lower limit value is 0.1%, more preferably 0.2% or more, the upper limit value is 2% or less, preferably 1.1% or less. Can be prescribed. That is, the heat shrinkage rate of the waterproof sheet 10 is preferably in the range of 0.1% to 2%, more preferably in the range of 0.2% to 1.1%.

  Then, next, the expansion / contraction rate under various temperatures was confirmed about the Example of this invention which satisfy | fills said conditions. When the result is shown in FIG. 6, it did not show a sufficient shrinkage rate at 23 ° C. and around 40 ° C. close to normal temperature, but the heat shrinkage rate at a temperature of 60 ° C. or higher was about 0.2% to 1%. It was included in the range of 1%, and no matter what season it was laid, it was possible to eliminate wrinkles naturally after one summer when it reached at least 60 ° C.

  The present invention is particularly useful in places exposed to high temperatures such as roofs, verandas and balconies of business buildings such as office buildings and school buildings that are exposed to strong winds, and residential buildings such as condominiums. It can be widely applied to ensure waterproofness.

DESCRIPTION OF SYMBOLS 1 Housing | casing 10 Waterproof sheet 10A The overlapping part of a waterproof sheet 12 Sheet | seat joining member 14 Guideline

(1. Installation method of waterproof sheet)
As a first means for solving the above-mentioned problems, the present invention provides a waterproof sheet laying method in which a waterproof sheet is fixed and laid on a sheet joining member installed on a structural body. Use a waterproof sheet with a heat shrinkage rate of 0.35% or more after 1 day to 7 days when heated at ℃, roll the roll-shaped waterproof sheet to the installation location, and deploy each location where the sheet joining member is installed A waterproof sheet laying method is provided, wherein the waterproof sheet is laid while being joined to a sheet joining member.

(2. Waterproof sheet)
The present invention also provides the following waterproof sheet that can be used in any one of the first to ninth solutions. That is, the present invention provides, as a tenth means for solving the above-mentioned problem, a waterproof sheet that is fixed to a sheet joining member that is installed on a structural body and is laid on the structure. In the case of heating, the waterproof sheet having a heat shrinkage of 0.35% or more after 1 day to 7 days is provided.

Claims (11)

In the method of laying a waterproof sheet in which the waterproof sheet is fixed and laid on a sheet joining member installed on a structural frame, a waterproof sheet having a heat shrinkage rate of 0.1% or more is used as the waterproof sheet, A method for laying a waterproof sheet, comprising rolling the waterproof sheet to an installation location and developing the waterproof sheet while joining the waterproof sheet to the sheet joint member for each installation location of the sheet joining member. The waterproof sheet laying method according to claim 1, wherein a waterproof sheet having a heat shrinkage rate of 2% or less is used as the waterproof sheet. The waterproof sheet laying method according to claim 1, wherein the waterproof sheet is processed into a sheet shape by extrusion molding. A method for laying a waterproof sheet according to any one of claims 1 to 3, wherein a guideline corresponding to a location where the waterproof sheet is to be laid is installed, and the waterproof sheet is rolled in accordance with the guideline. A method of laying a tarpaulin characterized by being developed. The method for laying a waterproof sheet according to any one of claims 1 to 4, wherein the waterproof sheet uses a sheet having a long-side end surface having linearity. Method. The waterproof sheet laying method according to any one of claims 1 to 5, wherein the waterproof sheet is welded with a solvent to the sheet joining member having a surface coated with a synthetic resin of the same quality as the waterproof sheet. In the case where the sheet bonding member is bonded and fixed, the solvent is applied not only to the surface of the sheet bonding member but also to a portion of the waterproof sheet that overlaps the sheet bonding member. A characteristic method of laying a waterproof sheet. The waterproof sheet laying method according to any one of claims 1 to 6, wherein a mark for preventing the fall is installed at a predetermined position in front of a position where the waterproof sheet is to be laid. A method of laying a waterproof sheet characterized by the above. A waterproof sheet, which is fixed to a sheet joining member installed in a structural body and laid on the structure, having a heat shrinkage rate of 0.1% or more. The waterproof sheet according to claim 8, wherein the waterproof sheet has a heat shrinkage rate of 2% or less. The waterproof sheet according to any one of claims 8 and 9, wherein the waterproof sheet is processed into a sheet shape by extrusion molding. The waterproof sheet according to any one of claims 8 to 10, wherein the end surface of the long side has linearity.

Images