JP2017008682A - Waterproof repairing method and waterproof repairing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve firm fixing of a new fixing plate and enhancement of workability at the same time.SOLUTION: A waterproof repairing method is by overlapping and bonding a new waterproof sheet 40 on an existing waterproof sheet 20 bonded on an ALC panel constituting an exterior finishing surface of a building, with an existing steel plate 18 in between. The waterproof repairing method includes the following steps for: bringing a new steel plate 30 in contact with a surface 20c of the existing waterproof sheet 20, such that the new steel plate is overlapped with the existing steel plate 18 with the existing waterproof sheet 20 in between; hammering a head part 36a of a screw 36 until a tip part 36c of the screw 36 penetrates through the new steel plate 30 and the screw 36 comes to a position that enables screwing into the existing steel plate 18, following the step for bringing the new steel plate 30 in contact with the existing waterproof sheet; tightening the screw 36 by rotation, following the step for hammering the screw head part; and overlapping and bonding the new waterproof sheet 40 so as to cover the head part 36a of the screw 36, following the step for tightening the screw 36 by rotation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waterproof repair method and a waterproof repair structure.

  As a conventional waterproof structure, for example, as described in Patent Document 1, a structure in which a fixing plate is disposed on a concrete slab that is a waterproof base and a waterproof sheet is fixed on the fixing plate is known. Yes. A through hole for inserting a screw is formed at a predetermined position of the fixing plate.

JP 2011-52394 A

  In the conventional waterproof structure, when waterproofing is performed, a new fixing plate is placed on an existing fixing plate via an existing waterproof sheet, and a new fixing plate is placed above the new fixing plate. A waterproof sheet may be overlaid. When fixing a new fixing plate with a screw or the like, for example, in order to avoid interference with a screw or the like inserted in a through-hole previously formed in the existing fixing plate, the new fixing plate uses a screw or the like of the existing fixing plate. Without using a through-hole provided at a position that is out of position, or by providing a new through-hole separately by on-site processing, it is difficult to firmly fix the new fixing plate, and workability is improved. It tends to decrease.

  It is an object of the present invention to provide a waterproof repair method and a waterproof repair structure that achieve both a strong fixing of a new fixing plate and an improvement in workability.

  In order to solve the above problems, the present invention is a waterproof repair method in which a new waterproof sheet is overlaid on an existing waterproof sheet attached to an exterior panel constituting an exterior surface of a building via an existing steel sheet. After the step of bringing the new steel plate into contact with the surface of the existing waterproof sheet and the step of bringing the new steel plate into contact with the surface of the existing waterproof sheet so as to overlap with the existing steel plate via the waterproof sheet, the tip of the screw penetrates the new steel plate. After the step of hitting the screw head to the position where the screw can be screwed into the existing steel plate, the step of applying the blow, the step of rotating and tightening the screw, and the step of rotating and tightening the screw And a step of overlaying and pasting a new waterproof sheet so as to cover the head of the screw.

  In the waterproof refurbishment method according to the present invention, the head of the screw is hit to reach a position where the screw can be screwed into the existing steel plate, and then the screw is rotated and tightened. A tip part is hard to slide sideways, and a new steel plate can be fixed to an existing steel plate without taking the labor of construction than before. Furthermore, since the screw and the existing steel plate are fixed so as to mesh with each other, it is easy to realize strong fixing. Therefore, according to this waterproof repair method, it is easy to achieve both the firm fixation of the new steel plate to the existing steel plate and the improvement of workability.

  In the step of applying the hit according to the present invention, the head of the screw may be hit until the tip of the screw penetrates the existing steel plate. In this case, the end portion is held by the existing steel plate due to the penetration, and the tip end portion of the screw is less likely to slide to the existing steel plate, which is advantageous in improving workability.

  In the waterproof repair method according to the present invention, the building exterior surface is a rising surface that rises along the peripheral edge of the external floor, and the rising surface extends along the peripheral edge and has a bottom surface and a side surface. A groove is formed, and the existing steel plate is a first piece that comes into contact with the bottom surface of the groove, a second piece that is bent and rises from one end of the first piece, and comes into contact with the side of the groove, and the other end of the first piece The second piece is bent in the opposite direction to the direction in which the second piece bends, and comes into contact with the rising surface, and the new steel plate is the fourth piece and the fifth piece bent from one end of the fourth piece. And in the step of contacting the new steel plate, the fourth piece of the new steel plate is brought into contact with the first piece of the existing steel plate, and the fifth piece of the new steel plate is installed via the existing waterproof sheet. You may make it contact | abut on the surface of the existing waterproof sheet so that it may overlap with the 3rd piece of a steel plate. In this case, the fourth piece of the new steel plate extends along the peripheral edge of the floor base via the first piece of the existing steel plate by contacting the first piece of the existing steel plate that contacts the bottom surface of the groove. It is latched by the bottom face of the groove part to do. After this state is reached, the head of the screw is hit, so that the position of the new steel plate can be prevented from shifting in the vertical direction due to the hit, and the new steel plate can be fixed with high accuracy.

  Further, the present invention is a waterproof repair structure in which a new waterproof sheet is overlaid on an existing waterproof sheet attached to an exterior panel constituting a building exterior surface via an existing steel sheet, And cover the head of the screw against the existing waterproof sheet, the new steel sheet that is in contact with the surface of the existing waterproof sheet, the screw that joins the existing steel sheet and the new steel sheet, and the existing waterproof sheet A new waterproof sheet that is overlaid, and a screw that hits the tip that penetrates the existing steel sheet, a shaft that is screwed into the existing steel sheet, and a position that can be screwed into the existing steel sheet Part.

  This waterproof repair structure can be realized by the above-described waterproof repair method, and is a result of realizing improvement in workability, and it is possible to realize firm fixation of a new steel plate to an existing steel plate.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to make compatible the firm fixation of the new steel plate with respect to the existing steel plate, and the improvement of workability.

It is sectional drawing of the existing waterproofing structure before waterproofing is improved by the waterproofing repair method which concerns on one Embodiment of this invention. It is sectional drawing of the repair structure after carrying out waterproof repair by the waterproof repair method which concerns on one Embodiment of this invention. It is a conceptual diagram which shows the process of performing waterproof repair with respect to the existing waterproof structure of FIG. It is a conceptual diagram which shows the process of performing waterproof repair with respect to the existing waterproof structure of FIG. It is a conceptual diagram which shows an example of the position where a screw can be screwed with respect to an existing steel plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same elements or elements having the same functions, and redundant description is omitted.

  The waterproof repair method according to the present embodiment is applied to a steel frame house whose outer wall is configured by an exterior panel such as an ALC panel. The waterproof repair method according to the present embodiment is a waterproof repair method in which a new waterproof sheet is overlaid on an existing waterproof sheet attached to an ALC panel that constitutes a building exterior surface via an existing steel plate.

  First, referring to FIG. 1 to FIG. 4, the existing waterproof structure 1 before being waterproofed by the waterproof repairing method according to the present embodiment and the waterproofing after being waterproofed by the waterproofing repairing method according to the present embodiment. The repair structure 1A will be described. 3A shows an enlarged part of the existing waterproof structure in FIG. 1, and FIG. 4F shows an enlarged part of the waterproof repair structure in FIG. ing.

  First, the existing waterproof structure 1 before repair will be described with reference to FIG. As shown in FIG. 1, the waterproof structure 1 is a structure in which an existing waterproof sheet 20 is disposed on a parapet 3 that rises along a peripheral edge 2 a of an external floor 2 of a building such as a veranda or a flat roof.

  The waterproof structure 1 has an external floor 2, a parapet 3, and an existing waterproof sheet 20. The external floor 2 includes a floor base 4 supported by a steel beam 9, heat insulating materials 11 and 12 laid in two layers on the floor base 4, a heat insulating material pressing plate 13 laid on the heat insulating material 12, have.

  The floor foundation 4 has a flat surface. The floor foundation 4 receives the weight of the external floor 2 or a load applied to the external floor 2 and transmits it to the frame including the steel beam 9. The floor foundation 4 is composed of, for example, a plurality of floor panels 6 laid over a steel beam 9 having an H-shaped cross section, and joint mortar 8 filled in a gap between the outer wall panel 10 and the floor panel 6 constituting the parapet 3. And. The joint mortar 8 corresponds to the peripheral edge of the floor foundation 4. The floor panel 6 is, for example, an ALC (lightweight cellular concrete) panel. The floor panel 6 has a rectangular shape. A substantially rectangular parallelepiped region 6a (see the dotted line in FIG. 1) inside the floor panel 6 is surrounded by a reinforcing girdle reinforcing bar arranged in two upper and lower stages.

  The heat insulating materials 11 and 12 have a function of improving the thermal environment in the building. The heat insulating materials 11 and 12 are foamed plastic heat insulating materials formed in a plate shape. The heat insulating materials 11 and 12 are formed of, for example, phenol foam, polystyrene foam, polyethylene foam, or the like. The heat insulating materials 11 and 12 are laid almost entirely on the floor base 4. The heat insulating materials 11 and 12 are fixed to the floor base 4 with screws 16.

  The heat insulating material pressing plate 13 is a base for pressing the heat insulating materials 11 and 12 and fixing the existing waterproof sheet 20. As the heat insulating material pressing plate 13, various materials can be used. As the heat insulating material pressing plate 13, a material having stickiness and high surface rigidity is suitable. This is to prevent the portion fixed by the screw from being broken (screw unscrewing) when an upward force is applied to the heat insulating material pressing plate 13 due to negative pressure or the like. The heat insulating material pressing plate 13 is laid almost entirely on the upper surface of the heat insulating material 12. Since the heat insulating material pressing plate 13 is fixed to the floor base 4 with screws 16, no adhesive is used between the heat insulating material 12 and the heat insulating material pressing plate 13.

  The parapet 3 is composed of a steel beam 9 located below the peripheral edge 2 a of the outer floor 2 and an outer wall panel 10 that stands along the joint mortar 8. The outer wall panel 10 is, for example, an ALC (lightweight cellular concrete) panel. The outer wall panel 10 protrudes above the outer floor 2 with a certain length. The parapet 3 has an inner side surface 3 a (rising surface) that rises along the joint mortar 8 located at the peripheral edge of the floor base 4.

  On the inner side surface 3 a of the parapet 3, a groove portion 5 extending in the horizontal direction along the peripheral edge portion of the floor foundation 4 is formed at a predetermined height position from the upper surface of the outer floor 2. The groove 5 is formed by cutting the inner side surface 3a into a substantially U-shaped cross section. On the inner side surface 3 a of the parapet 3, an existing steel plate 18 having a substantially Z-shaped cross section is disposed along the groove portion 5. Further, a sealing 7 made of a viscous material such as polyurethane is provided in the groove 5. The details of the configuration in the vicinity of the groove 5 will be described later with reference to FIG.

  The existing waterproof sheet 20 covers the entire surface of the outer floor 2 and covers from the periphery of the outer floor 2 to a predetermined height on the inner surface 3 a of the parapet 3. The predetermined height is, for example, the height in the vicinity of the groove 5 on the inner side surface 3a. Thereby, the existing waterproof sheet 20 forms a waterproof layer of the outer floor 2. The existing waterproof sheet 20 is formed of, for example, a vinyl chloride sheet, a vulcanized rubber sheet, an asphalt sheet, or an olefin sheet.

  An end 20 a of the existing waterproof sheet 20 is fixed to an existing steel plate 18 disposed in the groove portion 5, and the existing steel plate 18 is fixed to the parapet 3 by a screw member 19 described later. That is, the end 20 a of the existing waterproof sheet 20 is fixed to the parapet 3 via the existing steel plate 18. The existing steel plate 18 has, for example, a surface coated with vinyl chloride. The end 20a of the existing waterproof sheet 20 is bonded to the surface of the existing steel sheet 18 by welding using a solvent or fusion by heating. Further, the existing waterproof sheet 20 is in close contact with the substantially entire upper surface of the heat insulating material pressing plate 13 and the inner side surface 3 a rising from the peripheral edge 2 a of the outer floor 2 by the adhesive 17.

  As the adhesive 17, a viscous adhesive, that is, a pressure-sensitive adhesive is used. For example, as the adhesive 17, an adhesive such as neoprene rubber, nitrile rubber, acrylic rubber, butyl rubber, urethane rubber, or rubber asphalt can be used. Further, as the adhesive 17, an adhesive having no viscosity (curing), for example, an epoxy, acrylic, or urethane adhesive may be used.

  Here, details of the configuration around the groove 5 will be described with reference to FIG. FIG. 3A is an enlarged view showing the periphery of the groove portion 5 in the existing waterproof structure 1. As shown to (a) of FIG. 3, the groove part 5 has the bottom face 5a, the side surface 5b, and the upper surface 5c. The existing steel plate 18 is disposed along the side surface 5 b and the bottom surface 5 a in the groove portion 5 and the inner side surface 3 a of the parapet 3.

  Specifically, the existing steel plate 18 has a horizontal piece 21 (first piece), a vertical piece 22 (second piece), and a vertical piece 23 (third piece). The horizontal piece 21 is in contact with the bottom surface 5 a of the groove portion 5. The vertical piece 22 is bent and rises from one end 21 a of the horizontal piece 21. The vertical piece 22 is in contact with the side surface 5 b of the groove portion 5. The vertical piece 23 is bent from the other end 21 b of the horizontal piece 21 and hangs down. The vertical piece 23 is in contact with the inner side surface 3 a of the parapet 3. The vertical piece 22 and the vertical piece 23 are bent in a direction substantially orthogonal to the horizontal piece 21 and in directions opposite to each other. The end portion 20a of the existing waterproof sheet 20 is adhered to the surface 23a of the vertical piece 23 by welding using a solvent or fusion by heating as described above.

  A through hole 18 a is formed in the existing steel plate 18 in advance. The existing steel plate 18 is fixed to the inner surface 3a of the parapet 3 by a screw member 19 inserted through the through hole 18a. The screw member 19 includes a plug portion 19a and a screw portion 19b. As the screw member 19, for example, a Fischer plug is used. The existing waterproof structure 1 before renovation is comprised by the above.

  Next, the waterproof repair structure 1A after repair by the waterproof repair method according to the present embodiment will be described with reference to FIG. In the existing waterproof structure 1, waterproof repair is required after several decades, for example, due to deterioration over time. As shown in FIG. 2, the waterproof repair structure 1 </ b> A is affixed to the existing waterproof structure 1 shown in FIG. 1 by adding a new waterproof sheet 40 over the existing waterproof sheet 20 by the waterproof repair method according to this embodiment. The structure is a modified waterproof layer.

  The waterproof refurbishment structure 1 </ b> A includes a new steel sheet 30 and a new waterproof sheet 40 in addition to the configuration of the existing waterproof structure 1. Further, in place of the existing sealing 7, a new sealing 7 </ b> A is provided in the groove portion 5 of the waterproof repair structure 1 </ b> A. The new sealing 7 </ b> A is formed of a polyurethane-based viscous material like the existing sealing 7.

  The new steel plate 30 has a substantially L-shaped cross section, and is fixed to the existing steel plate 18 disposed in the groove 5 by screws 36. The details of the configuration near the groove 5 will be described later with reference to FIG.

  The new waterproof sheet 40 is laminated on the existing waterproof sheet 20. The new waterproof sheet 40 covers the entire surface of the external floor 2 through the existing waterproof sheet 20 and covers a predetermined height on the inner side surface 3 a of the parapet 3 from the periphery of the external floor 2. The predetermined height is, for example, the height in the vicinity of the groove 5. Thereby, the new waterproof sheet 40 forms the waterproof layer of the outer floor 2. The new waterproof sheet 40 is formed of, for example, a vinyl chloride sheet, a vulcanized rubber sheet, an asphalt sheet, or an olefin sheet, as with the existing waterproof sheet 20.

  An end 40 a of the new waterproof sheet 40 is fixed to the new steel plate 30 disposed in the groove 5. The new steel plate 30 has, for example, a vinyl chloride coating on the surface. The end 40a of the new waterproof sheet 40 is bonded to the surface of the new steel sheet 30 by welding using a solvent or welding by heating. The new waterproof sheet 40 is in close contact with the existing waterproof sheet 20 by the adhesive 15. As the adhesive 15, an adhesive similar to the adhesive 17 is used.

  Here, details of the configuration around the groove 5 will be described with reference to FIG. FIG. 4F is an enlarged view of the periphery of the groove 5 in the waterproof repair structure 1A. As shown in FIG. 4F, the new steel plate 30 is disposed along the horizontal piece 21 of the existing steel plate 18 and the existing waterproof sheet 20 located on the vertical piece 23 of the existing steel plate 18. .

  Specifically, the new steel plate 30 has a horizontal piece 31 (fourth piece) and a vertical piece 32 (fifth piece). The horizontal piece 31 is in contact with the surface 21 c of the horizontal piece 21 of the existing steel plate 18. The vertical piece 32 is bent from one end 31 a of the horizontal piece 31. The vertical piece 32 is in contact with the surface 20c of the end 20a of the existing waterproof sheet 20 so as to overlap the vertical piece 23 of the existing steel sheet 18 with the existing waterproof sheet 20 interposed therebetween. The end 40a of the new waterproof sheet 40 is bonded to the surface 32a of the vertical piece 32 by welding using a solvent or fusion by heating as described above.

  A through hole 30 a is formed in the new steel plate 30 in advance. The through hole 30 a is formed at a position that avoids interference with the screw member 19 inserted into the through hole 18 a of the existing steel plate 18. That is, the through hole 30a is formed at a position that does not overlap the through hole 18a of the existing steel plate 18 in a state in which the new steel plate 30 is in contact with the existing steel plate 18, for example, positioned below the through hole 18a. doing. The new steel plate 30 is fixed to the existing steel plate 18 and the inner side surface 3a of the parapet 3 by screws 36 inserted through the through holes 30a.

  The screw 36 couples the existing steel plate 18 and the new steel plate 30. The ALC screw is formed with increased hardness by heat treatment. The screw 36 has a head portion 36a, a shaft portion 36b formed with a high thread for the ALC panel, and a tip portion 36c. The tip portion 36c has, for example, a sharp shape. Moreover, the cutting edge may be formed in the front-end | tip part 36c. The screw 36 is, for example, a tapping screw or a drill screw. A through hole for the screw 36 is not formed in the existing steel plate 18. By hitting the head 36 a of the screw 36, the screw 36 is driven into the existing steel plate 18 from the outside of the existing steel plate 18. As a result, the tip 36 c of the screw 36 penetrates the new steel plate 30, and the screw 36 reaches a position where it can be screwed into the existing steel plate 18.

  The screwable position is a position where the screw 36 and the existing steel plate 18 are at least engaged. FIG. 5 is a conceptual diagram showing an example of a position where the screw 36 can be screwed into the existing steel plate 18. Specifically, as shown in FIG. 5, the screwable position refers to the tip of the screw 36 even if the tip 36 c of the screw 36 does not reach the vertical piece 23 of the existing steel plate 18. This is a position where the recess 24 of the vertical piece 23 formed by 36c meshes with the thread of the shaft 36b of the screw 36. The screwable position may be a position where the recess 24 of the vertical piece 23 and the screw thread of the tip part 36c mesh with each other when a screw thread is formed on the tip part 36c.

  Then, in a state where the screw 36 can be screwed to the existing steel plate 18, the screw 36 is tightened with an electric drill or the like. Thereby, the existing steel plate 18 is formed with a fitting hole 18b. Since the fitting hole 18b is formed by driving the screw 36 into the existing steel plate 18, the gap between the fitting hole 18b and the screw 36 is smaller than that of the through hole formed in advance. The screw 36 is tightly inserted into the fitting hole 18b and tightened in a meshed state. That is, the existing steel plate 18 and the screw 36 are firmly fixed so as to mesh with each other.

  Next, with reference to FIG.3 and FIG.4, each process of the waterproof repair method which concerns on this embodiment is demonstrated in detail. 3 and 4 are conceptual diagrams showing a process for waterproofing the existing waterproof structure 1 shown in FIG. As shown to (a) of FIG. 3, the sealing 7 is pierced in the groove part 5 of the existing waterproof structure 1 before waterproofing improvement. When the waterproof repair method according to this embodiment is performed on the waterproof structure 1, the sealing 7 is first removed as shown in FIG. Subsequently, as shown in FIG. 3C, the new steel plate 30 is disposed along the surface 21 c of the horizontal piece 21 of the existing steel plate 18 and the surface 20 c of the end portion 20 a of the existing waterproof sheet 20. . That is, the new steel plate 30 is brought into contact with the surface 20c of the existing waterproof sheet 20 (that is, the surface opposite to the adhesive surface with the existing steel plate 18) so as to overlap the existing steel plate 18 with the existing waterproof sheet 20 interposed therebetween. . Then, the screw 36 is inserted into the through hole 30a of the new steel plate 30 so that the screw 36 penetrates the new steel plate 30, and the head 36a of the screw 36 is hit by a function or the like.

  By hitting the head 36a of the screw 36, as shown in FIG. 4 (d), the tip 36c of the screw 36 penetrates the new steel plate 30, and the screw 36 can be screwed into the existing steel plate 18. Screw 36 is driven to the position. For example, the tip 36c of the screw 36 is in a state inserted at least into the existing steel plate 18. In the present embodiment, as shown in the drawing, the head 36a of the screw 36 is hit until the tip 36c of the screw 36 penetrates the existing steel plate 18. Thereby, the front-end | tip part 36c of the screw | thread 36 is hold | maintained with respect to the existing steel plate 18. As shown in FIG. The tip 36c of the screw 36 does not have to penetrate the existing steel plate 18 by hitting the head 36a of the screw 36. For example, as shown in FIG. 5, the tip 36c is formed by the tip 36c of the screw 36. The indented portion 24 of the existing steel plate 18 and the screw thread of the screw 36 may be engaged with each other. Subsequently, in a state where the tip 36c of the screw 36 is held against the existing steel plate 18, the screw 36 is rotated and tightened by an electric drill or the like as shown in FIG. As a result, the existing steel plate 18 is formed with a fitting hole 18 b that meshes with the shaft portion 36 b of the screw 36, and the shaft portion 36 b of the screw 36 is screwed with the existing steel plate 18. That is, the screw 36 and the existing steel plate 18 are firmly fixed to each other.

  Subsequently, as shown in FIG. 4F, a new waterproof sheet 40 is overlaid on the existing steel plate 18 so as to cover the head portion 36a of the screw 36. The end portion 40a of the new waterproof sheet 40 is bonded to the surface 32a of the vertical piece 32 by welding using a solvent or fusion by heating as described above. The new waterproof sheet 40 is in close contact with the existing waterproof sheet 20 by the adhesive 15. Thereby, the waterproof layer of the outer floor 2 is formed, the waterproof repair is completed, and the waterproof repair structure 1A is configured.

  Next, the operation and effect of the waterproof repair method and waterproof repair structure 1A according to the present embodiment will be described in comparison with the prior art.

  Conventionally, when waterproofing repair is performed in a waterproof structure, a new steel sheet is sometimes stacked on top of an existing steel sheet via an existing waterproof sheet, and the new waterproof sheet is overlaid on the new steel sheet. When fixing a new fixing plate with a screw or the like, for example, in order to avoid interference with a screw or the like inserted in a through-hole previously formed in the existing fixing plate, the new fixing plate uses a screw or the like of the existing fixing plate. Without using a through-hole provided at a position that is out of position, or by providing a new through-hole separately by on-site processing, it is difficult to firmly fix the new fixing plate, and workability is improved. It was easy to fall.

  For example, in the construction in the conventional waterproof renovation, first, both the existing steel plate and the new steel plate are penetrated by a hammer drill, and further, a through hole is formed in a parapet constituted by an ALC panel. Subsequently, an epoxy adhesive is injected into the through-hole formed in the parapet for the purpose of maintaining sufficient fixing strength. Subsequently, the screw member is inserted into the through hole into which the epoxy adhesive has been injected, and lightly driven with a hammer. Subsequently, a screw member such as a plug screw is rotated and tightened with an electric drill. As described above, in order to fix the existing steel plate so as to maintain sufficient fixing strength, first, through holes are formed in both the existing steel plate and the new steel plate, and an epoxy adhesive is injected into the formed through holes, etc. It took a lot of work and the workability was not good.

  With respect to this problem, according to the waterproof repair method according to the present embodiment, the head 36a of the screw 36 is hit to reach the position where the screw 36 can be screwed into the existing steel plate 18, and then the screw 36 is moved. Since it rotates and tightens, the front-end | tip part 36c of the screw | thread 36 does not slide sideways with respect to the existing steel plate 18, and the new steel plate 30 can be fixed to the existing steel plate 18 without taking the construction effort conventionally. Furthermore, since the screw 36 and the existing steel plate 18 are fixed so as to mesh with each other, it is easy to realize strong fixing. Therefore, according to this waterproof repair method, it is easy to achieve both the firm fixation of the new steel plate 30 to the existing steel plate 18 and the improvement of workability.

  Further, in the present embodiment, in the step of applying a blow, the head 36a of the screw 36 is hit until the tip 36c of the screw 36 penetrates the existing steel plate 18, so that the tip 36c is formed by the penetration. Since the tip end portion 36c of the screw 36 is less liable to skid with respect to the existing steel plate 18, it is advantageous in improving the workability. Since the screw 36 is formed with increased hardness by heat treatment with respect to the ALC screw, it is suitable for penetrating the existing steel plate 18. Further, the screw 36 has a shaft portion 36b formed with a high thread for ALC, so that appropriate construction can be performed on the ALC panel constituting the parapet 3. Furthermore, since the tip portion 36c of the screw 36 has a sharp shape, it is suitable for penetrating the existing steel plate 18. Moreover, when the cutting edge is formed in the front-end | tip part 36c of the screw | thread 36, the existing steel plate 18 can be penetrated more easily.

  Further, in the present embodiment, the horizontal piece 31 of the new steel plate 30 is brought into contact with the horizontal piece 21 of the existing steel plate 18 that is in contact with the bottom surface 5a of the groove portion 5, so that Locked to the bottom surface 5 a of the groove 5 extending along the peripheral edge of the ground 4. After this state, the head 36a of the screw 36 is hit, so that the position of the new steel plate 30 can be prevented from shifting in the vertical direction due to the hit, and the new steel plate 30 can be fixed with high accuracy. Can do.

  Moreover, in this embodiment, while the existing steel plate 18 has a substantially Z-shaped cross section, the new steel plate 30 has a substantially L-shaped cross section. That is, the existing steel plate 18 has a vertical piece 23 for fixing the existing waterproof sheet 20 and a vertical piece 22 for preventing water from entering from the groove portion 5, whereas the new steel plate 30 is a new waterproof sheet. While having the vertical piece 32 for fixing 40, it does not have the vertical piece for preventing intrusion of water from the groove portion 5. This is because the vertical piece 22 of the existing steel plate 18 has already prevented the intrusion of water from the groove 5, so that it is not necessary to form a vertical piece having the same function on the new steel plate. Thus, the new steel plate 30 is not formed with a vertical piece for preventing water from entering from the groove portion 5, so that the horizontal piece 31 of the new steel plate 30 is easily brought into contact with the bottom surface 5 a of the groove portion 5 and is easily arranged. In addition, the fit in the vicinity of the groove 5 can be improved.

  Further, according to the waterproof repair structure 1A according to the present embodiment, the existing steel plate 18 has the fitting hole 18b that meshes with the screw 36, so that the screw 36 and the existing steel plate 18 are fixed so as to mesh with each other, Sufficient fixing strength can be maintained. Therefore, this waterproof repair structure 1A can be realized by the above-described waterproof repair method, and is a result of realizing improved workability, and can firmly fix the new steel plate 30 to the existing steel plate 18.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the above embodiment, the waterproof repair method for the inner surface 3a of the parapet 3 has been described. However, the present invention is not limited to this, and the waterproof repair method according to the present invention is applicable to various building exterior surfaces.

  In the above embodiment, in the process of hitting the head 36a of the screw 36, the hitting is applied to the head 36a of the screw 36 until the tip 36c of the screw 36 penetrates the existing steel plate 18. Not limited. In this step, it is only necessary that the head 36a of the screw 36 is hit to the position where the screw 36 can be screwed with the existing steel plate 18 at least.

  In the above embodiment, the through hole 30a is formed in the new steel plate 30, but the through hole 30a may not be formed, and a screw is applied to the new steel plate 30 by hitting the head 36a of the screw 36. A hole into which 36 is screwed may be formed. In this case, for example, in the process of hitting the head 36 a of the screw 36, the tip 36 c of the screw 36 penetrates through the new steel plate 30 and hits at least a position where the screw 36 can be screwed into the existing steel plate 18. May be. Then, the screw 36 may be tightened in a state where the screw 36 is held. Thus, when the screw 36 is tightened in a state of penetrating the new steel plate 30 by hitting the head 36 a of the screw 36, the screw is not only applied to the existing steel plate 18 but also to the new steel plate 30. Since 36 is fixed so as to mesh with each other, the fixing strength can be further increased.

  2 ... external floor, 3a ... inside surface (rising surface), 5 ... groove, 5a ... bottom surface, 5b ... side surface, 8 ... joint mortar (peripheral edge), 18 ... existing steel plate, 18b ... fitting hole, 20 ... existing waterproofing Sheet, 20c ... surface, 21 ... horizontal piece (first piece), 21a ... one end, 21b ... other end, 22 ... vertical piece (second piece), 23 ... vertical piece (third piece), 30 ... new steel plate, 31 ... Horizontal piece (fourth piece), 31a ... One end, 32 ... Vertical piece (fifth piece), 36 ... Screw, 36a ... Head, 36c ... Tip, 40 ... New waterproof sheet.

Claims (4)

A waterproof renovation method in which a new waterproof sheet is overlaid on an existing waterproof sheet adhered to an exterior panel constituting a building exterior surface via an existing steel sheet,
Contacting a new steel sheet against the surface of the existing waterproof sheet so as to overlap the existing steel sheet via the existing waterproof sheet;
After the step of bringing the new steel plate into contact, a step of hitting the head of the screw to a position where the tip of the screw penetrates the new steel plate and the screw can be screwed to the existing steel plate;
A step of rotating and tightening the screw after the step of applying the impact;
After the step of rotating and tightening the screw, a step of overlaying and pasting a new waterproof sheet so as to cover the head of the screw.   The waterproof repair method according to claim 1, wherein, in the step of applying the impact, the impact is applied to the head of the screw until the tip of the screw penetrates the existing steel plate. The building exterior surface is a rising surface that rises along the peripheral edge of the external floor,
The rising surface has a groove portion extending along the peripheral edge portion and having a bottom surface and a side surface,
The existing steel plate includes a first piece that comes into contact with the bottom surface of the groove portion, a second piece that is bent from one end of the first piece and comes into contact with the side surface of the groove portion, and the other end of the first piece. A third piece that is bent in the opposite direction to the direction in which the second piece is bent and abuts against the rising surface,
The new steel plate has a fourth piece and a fifth piece bent from one end of the fourth piece,
In the step of contacting the new steel plate,
The fourth piece of the new steel plate is brought into contact with the first piece of the existing steel plate, and the fifth piece of the new steel plate is brought into contact with the third piece of the existing steel plate via the existing waterproof sheet. The waterproof repair method according to claim 1 or 2, wherein the surface of the existing waterproof sheet is brought into contact with each other so as to overlap. A waterproof refurbishment structure in which a new waterproof sheet is overlaid on an existing waterproof sheet adhered to an exterior panel constituting a building exterior surface via an existing steel sheet,
A new steel plate abutted against the surface of the existing waterproof sheet so as to overlap the existing steel sheet via the existing waterproof sheet;
A screw for joining the existing steel plate and the new steel plate;
With respect to the existing waterproof sheet, comprising a new waterproof sheet that is overlaid so as to cover the head of the screw,
The screw has a tip that penetrates the existing steel plate, a shaft portion that is screwed into the existing steel plate, and a head that has been hit to a position where it can be screwed into the existing steel plate. Construction.

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