JP5372441B2 - Repair structure and repair method of waterproof seat structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for repairing a waterproof sheet structure, which enable a new waterproof sheet to simply cover a drain part, without reference to a shape of the drain part and without deteriorating the drainage capacity of the drain part. <P>SOLUTION: The sheet waterproofing structure 100 is formed of the drain portion 29 which comprises a drain outlet 13 formed in an external floor 1 and a wastewater guiding portion 29a connected to the drain outlet 13 so as to guide wastewater on the external floor 1 to the drain outlet 13, and an existing waterproof sheet 21 for covering a surface of the external floor 1 except the drain portion 29. The sheet waterproofing structure 100 is repaired by being covered with the new waterproof sheet 55. In the structure 200 for repairing the sheet waterproofing structure, a drain cover 51 for surrounding the wastewater guiding part 29a of the drain part 29 is provided at the peripheral edge of the drain part 29 in the state of covering the top of the existing waterproof sheet 21; and the new waterproof sheet 55 is fixed to the drain cover 51. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a repair structure and a repair method for a waterproof sheet structure used for an external floor forming a veranda or a flat roof.

  Conventionally, on floors or roofs that protrude from the outer walls of living rooms, such as verandas and flat roofs, in order to drain rainwater and sprinkling from the roof by natural flow, the drainage groove is about 1/100 to 2/100. A so-called water gradient having a downward slope is formed. The water gradient of the above-mentioned veranda floor and flat roof (hereinafter referred to as the external floor) is a base material such as a waterproof base mortar or heat insulating material provided on the upper surface of the panel or slab constituting the floor or roof, or a base panel. Generally, it is formed by inclining any one of the above. Further, the drainage groove is formed by a drainage groove forming member formed by pressing a metal plate or the like, and the drain part for finally draining the drainage reaching the drainage groove from the external floor is drainage. It is connected to the groove and is provided in a state where the drain pipe is penetrated through the external floor or a rising wall portion rising from the edge of the external floor.

At the time of repair work for the waterproof sheet structure, a repair drain member that is attached on top of an existing drain part is used for repair of the periphery of the drain. As this drain member for repair, a repair drain main body comprising a water guide cylinder that can be inserted into the drain pipe part of the existing drain part, and a circular flange plate that is provided around an inflow side end of the water guide cylinder body; And a flexible synthetic resin sheet attached to the flange plate, wherein the flexible synthetic resin sheet is joined to the flange plate of the modified drain body by an adhesive or the like (Patent Document). 1).
JP 2006-291594 A

  However, the above-described repair drain is configured such that the water guide cylinder inserted through the drain pipe portion of the drain portion and the flange plate that covers the periphery of the drain pipe portion are integrally formed, and the drain portion for covering covers the entire drain portion. It is. For this reason, if the periphery of the drain pipe part is not a simple taper shape or flat shape within a predetermined range as in the above-mentioned patent document, it is extremely difficult to bond the flange plate and the periphery of the drain pipe part of the drain part. However, there is a problem in that it takes time and effort to install the repair drain. On the other hand, the drain pipe part of the existing drain is generally formed of a resin or the like that is more resistant to deterioration than the waterproof sheet. In view of this point, the drain pipe part as described in the above patent document is newly added. It is not necessary to cover the water guide cylinder, and the substantial opening area of the drainage port is reduced due to the water pipe covering, and thus the exterior designed based on the opening area before refurbishment. It is possible that the floor overflow structure will not be able to cope with the increased water on the external floor.

  Therefore, the present invention provides a repair structure and a repair method for a waterproof sheet structure capable of simply mounting a new waterproof sheet regardless of the shape of the drain part and without reducing the drainage capacity of the drain part. For the purpose.

Renovation structure of sheet waterproofing structure of the present invention, enclosing a groove-like drainage induction unit comprising a drainage port that will be connected to the drainage pipe which is formed outside the floor to form a veranda or flat roofs at the bottom, a drainage guiding portion performing a drain portion, and the existing waterproofing sheet except the waste water guiding portion covering the surface of the outer bed, refurbishment and covered state new waterproof sheet to the sheet waterproofing structure to be formed with a having a flange condition a repair structure of the sheet waterproofing structure, the drain portion, the drain cover surrounding the drainage guiding portion covers at least the flange portion is provided, the new tarpaulin, which is fixed to the drain cover It is covered by the existing waterproof sheet shape .

  According to this, since the drain cover is provided not on the drain part but on the periphery of the drain part, the drain cover can be provided regardless of the shape of the drain part. Therefore, there is little possibility that the drainage performance of the drain portion will be lowered with the installation of the drain cover or the installation of a new waterproof sheet. Moreover, since the existing waterproof sheet covers the surface of the external floor except for the drain portion, it is possible to sufficiently lay a new waterproof sheet on the existing waterproof sheet even with the above-described configuration.

  Further, the drain cover is fixed on the existing waterproof sheet and fixed to the new waterproof sheet around the drain cover, and acts on the fixing portion between the drain cover and the new waterproof sheet as the new waterproof sheet shrinks due to aging. A buffer member for buffering the tensile force may be provided.

  The new tarpaulin also shrinks due to aging after renovation, and the in-plane tensile force acting at the time of the shrinkage increases with the interval between the fastening of the tarpaulin, and the new tarpaulin and drain cover It is also assumed that a tensile force that is so great as to cause defects in welding may act on the welded portion between the new waterproof sheet and the drain cover. Therefore, by providing the buffer member around the drain cover, the tensile force acting on the welded portion between the drain cover and the new waterproof sheet is buffered. As a result, it is possible to prevent an excessive tensile force from acting on the welded portion between the new waterproof sheet and the drain cover, and to suppress deterioration of the water stoppage of the welded portion.

  Further, the drain cover may be joined to an existing waterproof sheet via a sealing material. By using a sealing material at the joint between the drain cover and the existing waterproof sheet, the water stoppage of the joint is ensured. Here, the tensile force due to the shrinkage of the above-described new waterproof sheet also acts on the joint between the drain cover and the existing waterproof sheet. On the other hand, due to the presence of the buffer member, the tensile force acting on the joint between the drain cover and the existing waterproof sheet is buffered. In general, the sealing material may have a weak adhesive force, but with the above configuration, the tensile force acting on the joint can be kept low, so there is little risk of loss of the adhesive state due to the sealing material. Deterioration of water stoppage at the joint with the waterproof sheet is suppressed.

  Further, the drain cover may be formed in a shape that covers a part of the drainage guiding portion of the drain portion and covers the edge of the existing waterproof sheet that appears around the drainage guiding portion.

  According to this, since the joint between the existing waterproof sheet and the drain portion is covered with the drain cover, the water-stopping property of the new sheet waterproof structure formed by the new waterproof sheet can be further improved.

Renovation method of roofing membrane structure of the present invention, a groove-like drainage guide portion comprising a drainage port that will be connected to the drainage pipe which is formed outside the floor to form a veranda or flat roofs in low areas, the drainage induction unit a drain portion and a flange surrounding the existing waterproofing sheet except the waste water guiding portion covering the surface of the outer bed, refurbishment and covered state new waterproof sheet to the sheet waterproofing structure is formed with a A method for repairing a waterproof sheet structure, wherein a drain cover that covers at least a flange portion of the drain portion is placed on the drain portion, and then the new waterproof sheet is fixed to the drain cover.

  According to this, since the drain cover is provided not around the drain part but around the drain part, it is possible not only to provide the drain cover regardless of the shape of the drain part, but also after the repair, the drain part is already provided. Therefore, there is little possibility that the drainage performance of the drain portion will be lowered with the installation of the drain cover or the installation of a new waterproof sheet. Moreover, since the existing waterproof sheet covers the surface of the external floor except for the drain portion, it is possible to sufficiently lay a new waterproof sheet on the existing waterproof sheet even with the above-described configuration.

  Further, in this case, the drain cover is fixed on the existing waterproof sheet and fixed to the new waterproof sheet around the drain cover, and the drain cover and the new waterproof sheet are fixed to each other due to shrinkage due to aging of the new waterproof sheet. It is good also as installing the buffer member which buffers the acting tensile force, and adhering a new waterproof sheet to a buffer member, and then adhering the new waterproof sheet to a drain cover.

  According to this, a cushioning member is provided around the drain cover and the cushioning member and the new waterproof sheet are fixed to each other, so that most of the tensile force due to the shrinkage of the new waterproof sheet is reduced with the cushioning member and the new waterproof sheet. It is supposed to act on the fixing part with the waterproof sheet. As a result, it is possible to prevent an excessive tensile force from acting on the fixing portion between the new waterproof sheet and the drain cover, and to suppress deterioration of the water stoppage of the fixing portion.

  According to the repair structure and the repair method of the waterproof sheet structure of the present invention, a new waterproof sheet can be easily mounted regardless of the shape of the drain portion and without reducing the drainage capacity of the drain portion.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a repair structure and a repair method for a waterproof sheet structure according to the present invention will be described in detail with reference to the drawings.

  The repair structure and the repair method for a waterproof sheet structure according to the present invention are applied to a rainwater drainage structure on an outside floor that forms a veranda or a substantially flat land roof protruding from an outer wall of a living room. 1 and 2 are views showing an external floor 1 that forms such a flat roof as an example. As shown in the figure, the exterior floor 1 of this building has a square annular planar shape that surrounds the living room 3 and whose outer periphery is defined by the parapet 5. The external floor 1 is provided with a drainage structure for draining rainwater.

  The drainage structure is connected to, for example, a water gradient portion 70 that is high near the center of the outer floor upper surface 1a and is low on the outer wall 3a side and the parapet 5 side, and water lower end portions on both sides of the water gradient portion 70. 70 and a drain groove 71 into which water flows.

  The water gradient portion 70 includes a water lower portion 72 on the outer wall 3a side of the living room 3 on the inner peripheral side of the outer floor upper surface 1a, and the water lower portion 72 is formed horizontally along the outer wall 3a with no height difference. A drainage groove 7 is provided between the water lower portion 72 and the outer wall 3a. Further, the water gradient portion 70 includes a water lower portion 73 on the parapet 5 side of the outer peripheral portion of the outer floor upper surface 1 a, and the water lower portion 73 is formed horizontally along the parapet 5 with no height difference. A drainage groove 9 is also provided between the water lower portion 73 and the parapet 5.

  The drain grooves 7 and 9 are formed horizontally along the longitudinal direction of the outer wall 3a and the parapet 5, and are formed in a so-called zero gradient having no gradient in the groove forming direction (extending direction). . For this reason, the drainage in the drain grooves 7 and 9 flows down due to the rise of the water level, not the natural flow due to gravity. In the case of such a so-called zero gradient, the level of the drain grooves 7 and 9 does not change in the groove forming direction, so that the various parts constituting the drain grooves 7 and 9 can be unified.

  The drainage groove 7 on the side of the living room 3 and the drainage groove 9 on the parapet 5 side are communicated with each other by, for example, a communication drainage groove 8. The level of the lower part 72 on the side of the living room 3 and the level of the lower part 73 on the side of the parapet 5 are the same, and the levels of the drain grooves 7 and 9 provided along these lower parts 72 and 73 are also the same. Further, a drain outlet 11 for discharging rainwater from the drain groove 7 is provided on the side near the drain groove 7. Similarly, a drain outlet 13 for discharging rainwater from the drainage groove 9 is provided on the side near the drainage groove 9. The drain ports 13 are provided at several locations along the drain grooves 9. In addition, when the drainage groove 7 on the side of the living room 3 and the drainage groove 9 on the side of the parapet 5 are configured to be capable of draining independently, the levels of both may not be equal.

  As described above, the outer floor upper surface 1 a is formed with the water lower portion 72 and the drainage groove 7 forming the drainage groove portion 71 around the living room 3, and the water lower portion 73 and the drainage groove portion 71 are formed along the inner periphery of the parapet 5. A drainage groove 9 to be formed is formed. For this reason, the positions of the surroundings of the living room 3 and the inner periphery of the parapet 5 on the outer floor upper surface 1a are set to the lowest level, and the water gradient of the climbing gradient starts from the bottoms 72 and 73 formed at these positions. Slopes 80a to 80j are formed. Edges 81a to 81f are formed at the intersections of these slopes 80a to 80j, and mountain lines 82a to 82g and valley lines 83a to 83c are formed from the intersections of the ridge lines 81a to 81f.

  The difference in height between the lower part 72 on the side of the living room 3, the lower part 73 on the side of the parapet 5, and the ridgelines 81 a to 81 f is, for example, 1 / th of the distance between the parallel (opposing) lower parts of the outer floor top surface 1 a 2 and a water gradient (about 1/100 to about 2/100). For example, when the distance between the opposed lower portions 72 and 73 is 360 cm and the water gradient is 1/100, the height of the ridge line is 18 mm.

  3 and 4 show a waterproof sheet structure in the vicinity of the drain port 13 before the repair is performed. As shown in FIG. 3, in the waterproof sheet structure 100 before renovation of the building, a waterproof sheet 21 made of vinyl chloride is installed over the entire surface of the external floor 1. This waterproof sheet 21 covers the drainage groove 9 from the upper surface of the outer floor 1, and further rises and continues to cover a predetermined height with the inner wall surface 5a. With the configuration described above, the rainwater on the external floor 1 of this building is guided to the drainage groove 9 by the water gradient and is finally discharged out of the building through the drainage port 13. Further, the vicinity of the drainage port 13 has the same configuration as that of the vicinity of the drainage port 13, and rainwater guided to the drainage groove 7 by the water gradient is finally discharged out of the building through the drainage port 11. .

  Hereinafter, the structure near the drain port 13 will be described in more detail. As shown in FIGS. 3 and 4, the outer floor 1 is provided with a gradient heat insulating material 25, which forms a water gradient portion 70, on an ALC (Autoclaved Light-Weight Concrete) plate 23. A plate 25a is further laid, and a waterproof sheet 21 is laid on the upper plate 25a. In the external floor 1, the above-described water gradient is provided by making the upper surface of the gradient heat insulating material 25 inclined. The gradient heat insulating material 25, the upper plate 25 a and the waterproof sheet 21 are laid in a region excluding the vicinity of the outer wall panel forming the parapet 5, that is, a region excluding a portion where the drainage groove 9 is formed. The gradient heat insulating material 25 is thinner in thickness from the center side of the outer floor upper surface 1a toward the parapet side, and thereby the gradient of the water gradient portion 70 is formed.

  The drainage groove 9 is formed by press-molding a single steel plate, and the surface thereof is covered with a vinyl chloride resin by laminating or the like. Further, the drainage groove 9 is formed as a drainage groove part forming member with a predetermined length, and the drainage groove forming member is laid along the parapet, thereby extending along the longitudinal direction of the parapet 5 as shown in FIG. Is formed. Further, the drainage groove forming member is connected to the adjacent drainage groove part forming member by abutment, and their joints are sealed with a watertight sheet (not shown) made of vinyl chloride resin. Since the surface of the drainage groove forming member is coated with the vinyl chloride resin as described above, the watertight sheet is attached to the drainage groove forming member by heat welding of these vinyl chloride resins, welding with a solvent, or adhesion. A good seal is formed with no gap between them.

  In the waterproof sheet structure 100, the waterproof sheet 21 is laid on the gradient heat insulating material 25 by a so-called insulation method. That is, a vinyl chloride resin disk 26 is arranged at a predetermined interval between the upper plate 25 a and the waterproof sheet 21 and screwed to the ALC plate 23. The upper surface of each disk 26 and the lower surface of the waterproof sheet 21 are welded to fix the waterproof sheet 21 to the ALC plate 23.

  Further, on the ALC plate 23, a gradient heat insulating material 25 is partly cut and a drain member 27 made of vinyl chloride is installed. The drain member 27 has a drain portion 29 that extends from the drainage groove 9 toward the inside of the outer floor 1, and a flange 31 that surrounds the drain portion 29. The drain member 27 is fixed by screwing the flange 31 to the upper surface of the gradient heat insulating material 25. The drain part 29 has a drainage guiding part 29a that forms a groove extending laterally from the drainage groove 9, and a drainage port 13 that is formed as an opening in the groove bottom surface at the tip of the drainage guiding part 29a. Since the groove constituted by the drainage guiding portion 29a is dug down below the upper surface of the outer floor 1 and is almost at the same level as the drainage groove 9, the rainwater in the drainage groove 9 passes through the drainage guiding portion 29a and passes through the drainage port. Guided up to 13. A drain pipe 33 for sending rainwater from the drain port 13 downward is connected to the drain member 27 below the drain port 13. The drain pipe 33 extends downward through the ALC plate 23 and passes through the inside of the outer wall of the building.

  The drain portion 29 of the drain member 27 is not covered with the waterproof sheet 21 and is exposed upward. That is, the waterproof sheet 21 is cut out according to the rectangular planar shape of the drain portion 29. Then, the edge portion 21 a of the cut-out waterproof sheet 21 appears around the drainage guiding portion 29 a, and this edge portion 21 a is welded to the upper surface of the flange 31 of the drain member 27. By fixing by such welding, rainwater intrusion from the joint between the waterproof sheet 21 and the drain member 27 is prevented.

  Since the waterproofing performance of the sheet waterproof structure 100 as described above is deteriorated due to deterioration over time, it needs to be repaired regularly (for example, every 30 years). Such a repair is performed by further overlaying a new waterproof sheet made of vinyl chloride on the waterproof sheet 21. Hereinafter, the details of the repair structure and the repair method for repairing the waterproof sheet structure 100 will be described. In the following description, in order to distinguish between the old and new waterproof sheets, the existing waterproof sheet 21 is referred to as “existing waterproof sheet”, and the new waterproof sheet installed on the waterproof sheet 21 is referred to as “new waterproof sheet”. ".

  In this repair structure and the repair method, as shown in FIGS. 5 and 7, a drain cover 51 made of vinyl chloride is prepared, and the drain cover 51 is fitted into the drain portion 29 from above the existing waterproof sheet 21. The drain cover 51 is formed in a square ring shape having a rectangular opening 51 c in the center so as to surround the drain portion 29. The drain cover 51 is placed over the existing waterproof sheet 21 on the flange 31 of the drain member 27, and covers the inner wall surface of the groove of the drainage guiding portion 29a extending downward from the flange portion 51a. And a vertical wall 51b.

  By fitting such a drain cover 51 into the drain portion 29, the groove bottom surface and the drain port 13 of the existing drainage guiding portion 29a are exposed from the rectangular opening 51c of the drain cover 51, and the drainage guiding portion. The drain cover 51 covers the edge 21 a of the existing waterproof sheet 21 that appears around 29 a. Therefore, the joint between the existing waterproof sheet 21 and the drain member 27 is surely covered by the drain cover 51, and the water stoppage at the joint is ensured. The drain cover 51 fitted here is joined to the drain member 27 and the existing waterproof sheet 21 via the sealing material 52. Therefore, the water stoppage of the joint portion is further ensured, and the water stoppage of the joint between the existing waterproof sheet 21 and the drain member 27 is ensured.

  While the drain cover 51 is attached, as shown in FIGS. 6 and 7, new vinyl chloride resin disks (buffer members) 53 are arranged at predetermined intervals on the existing waterproof sheet 21 of the outer floor 1. And screwed to the ALC plate 23. In this case, in particular, a plurality of disks 53 are arranged around the drain cover 51 so as to surround the drain cover 51. Then, a new waterproof sheet 55 made of vinyl chloride is placed on the existing waterproof sheet 21, and the upper surface of each disk 53 and the lower surface of the new waterproof sheet 55 are welded in the same manner as the insulation method described above, so that the new waterproof sheet 55 is formed. Fixed to the ALC plate 23. The new waterproof sheet 55 is cut out in accordance with the rectangular planar shape of the drain portion 29 in the same manner as the existing waterproof sheet 21, and the edge portion 55a of the cut out new waterproof sheet 55 is formed around the drainage guide portion 29a. Appears.

  Next, the edge portion 55 a of the cut out new waterproof sheet 55 is welded to the upper surface of the flange portion 51 a of the drain cover 51. That is, here, the solvent is injected between the edge portion 55a of the new waterproof sheet 55 and the flange portion 51a. By this solvent, the surface of the new waterproof sheet 55 made of vinyl chloride and the surface of the drain cover 51 are once dissolved and cured again, so that the lower surface of the edge portion 55a and the upper surface of the flange portion 51a of the new waterproof sheet 55 are formed. Be joined. By such welding, rainwater intrusion from the joint between the new waterproof sheet 55 and the drain cover 51 is prevented. With the above-described repair method, the seat waterproof structure repair structure 200 near the drain port 13 is completed.

  According to the modified structure 200 and the modified method, the drain cover 51 is provided not on the drain portion 29 but on the periphery of the drain portion 29, so that the drain cover 51 can be provided regardless of the shape of the drain portion 29. Furthermore, after the repair, the state in which the existing drain portion 29 of the existing drain member 27 is exposed is maintained. That is, since the drainage guiding portion 29a and the drainage port 13 in the drain portion 29 are used as they are after the repair, the structure of the drain portion 29 is hardly changed, and the drainage passage of the drain portion 29 is narrowed by the repair. Absent. Therefore, there is little possibility that the drainage performance of the drain part 29 will be lowered with the installation of the drain cover 51 or the installation of the new waterproof sheet 55.

  Moreover, since the existing waterproof sheet 21 covers the surface of the external floor 1 except for the drain portion 29, the new waterproof sheet 55 can be sufficiently laid on the existing waterproof sheet 21 even with the above-described configuration. It is. In addition, since the drain member 27 and the drain pipe 33 that form the drain guide part 29a and the drain port 13 are sufficiently excellent in deterioration resistance as compared with the existing waterproof sheet 21, it is necessary to replace it when the existing waterproof sheet 21 is repaired. Often there is no.

  Moreover, in this building, since the drain pipe 33 is installed inside the building outer wall, it is troublesome to handle the drain pipe 33 when the waterproof seat structure of the external floor 1 is modified. On the other hand, according to the repair structure 200 and the repair method described above, it is not necessary to remove the drain member 27, and the drain member 27 and the drain pipe 33 connected to the drain member 27 are left as they are. Therefore, at the time of renovation, it is not necessary to handle the drain pipe 33 installed inside the building outer wall, and the renovation work can be simplified.

  The new waterproof sheet 55 also shrinks due to aging after the renovation, and the in-plane tensile force acting at the time of the shrinkage increases with the interval between the fastenings of the new waterproof sheet 55. It is also assumed that a tensile force that is large enough to cause a problem in welding with the drain cover 51 may act on the welded portion between the new waterproof sheet 55 and the drain cover 51. On the other hand, according to the repair structure 200 and the repair method described above, the disk 53 is provided around the drain cover 51 and the back surface of the new waterproof sheet 55 is welded to the disk 53. Most of the tensile force due to the above acts on the joint between the disk 53 and the new waterproof sheet 55. As a result, the tensile force acting on the welded portion between the new waterproof sheet 55 and the drain cover 51 is buffered and an excessive tensile force is prevented, so that deterioration of the water stoppage of the welded portion can be suppressed.

  Moreover, since the drain cover 51 is joined to the existing waterproof sheet 21 via the sealing material 52, the water stoppage of the joined portion is ensured. Here, the tensile force due to the shrinkage of the new waterproof sheet 55 described above can also act on the joint between the drain cover 51 and the existing waterproof sheet 21, but due to the presence of the disk 53 around the drain cover 51, the drain cover 51. And the tensile force which acts on the junction part of the existing waterproof sheet 21 is buffered. In general, the sealing material may have a relatively weak adhesive force. However, since the tensile force acting on the joint portion can be kept low by the above-described configuration, the adhesive state by the sealing material 52 is less likely to be lost. The deterioration of the water stoppage at the joint between the cover 51 and the existing waterproof sheet 21 is suppressed.

  In addition, since the waterproof structure, the repair structure, and the repair method in the drain port 11 are the same as the waterproof structure 100, the repair structure 200, and the repair method of the drain port 13 described above, detailed description is omitted. Further, the waterproof structure 100, the repair structure 200, and the repair method in the vicinity of the drain port 13 described above can be directly applied to the drain port provided near the parapet of the veranda on the external floor forming the veranda of the building.

It is a perspective view showing an embodiment of an external floor to which a repair structure and a repair method for a waterproof sheet structure according to the present invention are applied. It is a top view of the external floor of FIG. It is a partially broken perspective view which shows the waterproof structure in the external floor of FIG. It is IV-IV sectional drawing of the waterproof structure of FIG. It is a partially broken perspective view which shows 1 process of the repair method of the waterproof structure of FIG. It is a partially broken perspective view which shows the repair structure of the waterproof structure of FIG. It is VII-VII sectional drawing of the repair structure of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... External floor, 11, 13 ... Drain port, 21 ... Existing waterproof sheet, 21a ... Edge of existing waterproof sheet, 29 ... Drain part, 29a ... Drain guide part, 51 ... Drain cover, 52 ... Sealing material, 53 ... Disc (buffer member), 55 ... new waterproof sheet, 100 ... sheet waterproof structure, 200 ... renovated structure.

Claims (6)

A groove-like drainage induction unit comprising a drainage port that will be connected to the drainage pipe which is formed outside the floor at the bottom to form a veranda or flat roof, a drain portion and a flange surrounding the drainage induction unit, the waste water induced An existing waterproof sheet that covers the surface of the external floor excluding a portion, and a repair structure for a waterproof sheet structure that is repaired by attaching a new waterproof sheet to a waterproof sheet structure formed by providing a waterproof sheet,
The drain part is provided with a drain cover that covers at least the flange part and surrounds the drainage guiding part,
Renovation structure of the new tarpaulin, sheet waterproofing structure according to claim <br/> being covered state to the existing waterproofing sheet in a state of being fixed to the drain cover. Around the drain cover, it is fastened on the existing waterproof sheet and fixed to the new waterproof sheet, and acts on a fixing portion between the drain cover and the new waterproof sheet as the new waterproof sheet shrinks due to aging. The waterproof structure for a sheet waterproof structure according to claim 1, wherein a buffer member for buffering the tensile force is provided. The repair structure for a waterproof sheet structure according to claim 2, wherein the drain cover is joined to the existing waterproof sheet via a sealing material. The drain cover is formed in a shape that covers a part of the drainage guiding portion of the drain portion and covers an edge of the existing waterproof sheet that appears around the drainage guiding portion. The repair structure of the sheet | seat waterproofing structure of any one of -3. A drain portion having a groove-like drainage guide portion provided with a water outlet that will be connected to the drainage pipe which is formed outside the floor lower portion, and a flange surrounding the drainage guide portion forming a veranda or flat roof, the drainage An existing waterproof sheet that covers the surface of the external floor excluding the guide portion , and a method for repairing a waterproof sheet structure that is repaired by attaching a new waterproof sheet to a waterproof sheet structure that is formed.
A method for repairing a waterproof sheet structure, comprising: covering a drain cover covering at least the flange portion of the drain portion; and then fixing the new waterproof sheet to the drain cover. Around the drain cover, it is fixed on the existing waterproof sheet and fixed to the new waterproof sheet, and acts on a fixing portion between the drain cover and the new waterproof sheet as the new waterproof sheet shrinks due to aging. Install a buffer member to buffer the tensile force,
The method for repairing a waterproof sheet structure according to claim 5, wherein the new waterproof sheet is fixed to the drain cover after the new waterproof sheet is fixed to the buffer member.

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