Waterproofing construction and its construction method

Abstract

To prevent a sound or vibration from being generated during a repair of an existing waterproof sheet and to reduce a risk of a new waterproof sheet being cut or being wrinkled due to a joint part of the existing waterproof sheet being cut or moved.SOLUTION: A repair waterproof structure comprises an adhesive layer on which an adhesive agent is applied so as to continuously cover a joint part of an existing waterproof sheet laid and fixed on a substrate, and a sheet-like new waterproof layer laid and fixed on the existing waterproof sheet by the adhesive layer, wherein the new waterproof layer has a buffer sheet adhered to the adhesive layer and a new waterproof sheet laminated and integrated with the buffer sheet beforehand, and the buffer sheet is composed of a foam sheet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a waterproofing structure for renovating an existing waterproofing layer among waterproofing structures for rooftops, roofs, verandas, etc., and a construction method thereof. [Background technology]

[0002] Conventionally, waterproofing work has been carried out using waterproof sheets as a waterproof layer to waterproof the framework of verandas, balconies, flat roofs, etc. There is concern that these waterproof sheets will deteriorate over time and their waterproofing properties will decrease, so existing waterproof sheets are repaired at appropriate times.

[0003] When repairing such existing waterproof sheets using waterproof sheets, the mechanical fixing method is often used. In repair methods using the mechanical fixing method, a waterproof sheet for repair is laid on top of the existing waterproof sheet, and the waterproof sheet for repair is fixed to the base using a fixing disk fixed to the base with a screw.

[0004] Patent Document 1 discloses a renovation waterproof sheet that is used to lay from above an existing waterproof sheet laid on a base for the purpose of renovating the existing waterproof sheet, which is made by laminating a thermoplastic resin film onto at least the underside of a waterproof sheet body made of rubber, and which discloses that a fixing plate is anchored onto the existing waterproof sheet in advance, and the renovation waterproof sheet is laid and fixed by heat fusing it to the fixing plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-125182 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when repairs are made using the mechanical fixing method, screws must be driven into the base to fix the fixing disk, which creates problems such as noise and vibration. Therefore, an adhesive method can be used to fix the new waterproof sheet for repairs using adhesive. Repairs are carried out using adhesive methods. cormorant In this case, there is a concern that the movement of the base may cause the deteriorated joints between adjacent existing waterproof sheets to tear or move, causing the new waterproof sheet laid and fixed on top of the joints to tear or wrinkle.

[0007] In other words, the object of the present invention is to prevent the generation of noise and vibration when renovating an existing waterproof sheet, and to reduce the risk of the new waterproof sheet being torn or wrinkled due to the joints of the existing waterproof sheet being torn or moved. [Means for solving the problem]

[0008] The method used to solve the problem involves laying and fixing a new waterproof layer on top of the existing waterproof sheet using adhesive, and then applying adhesive to the joints of the existing waterproof sheet. Specifically, the new waterproofing layer is provided with an adhesive layer applied so as to continuously cover the joints of the existing waterproof sheet laid and fixed on the base, and the new waterproofing layer is laid and fixed to the existing waterproofing layer by the adhesive layer. The joint portion is an overlapping portion of adjacent existing waterproof sheets, The waterproofing structure for repair is a structure in which a new waterproof layer has a buffer sheet bonded to an adhesive layer and a new waterproof sheet laminated and integrated with the buffer sheet in advance, and the buffer sheet is made of a foam sheet. The buffer sheet may be laid so as to cover the joints, or the buffer sheet may further have a reinforcing layer. The joints of the existing waterproof sheet and the joints of the new waterproof sheet may be arranged so as not to overlap. The construction method further includes a step of applying adhesive to continuously cover the joints of a plurality of existing waterproof sheets laid and fixed on a base to form an adhesive layer, and a step of laying and fixing a new waterproof layer on the adhesive layer, The joint portion is an overlapping portion of adjacent existing waterproof sheets,A construction method for a renovated waterproof structure can be used, which includes a new waterproof layer, a buffer sheet that is bonded to an adhesive layer, and a new waterproof sheet that has been pre-laminated and integrated with the buffer sheet, and in which the buffer sheet is made of a foam sheet. Effect of the Invention

[0009] According to the present invention, by fixing the new waterproof layer with adhesive, it is possible to prevent noise and vibration during renovation. Also, by applying adhesive to the joints of the existing waterproof sheet and laying and fixing the new waterproof layer, the deteriorated joints are repaired while the new waterproof layer is formed. This reduces the risk of the joints of the existing waterproof layer breaking or moving, and further provides a waterproofing structure for renovation and a construction method thereof that can reduce breaking or wrinkling of the new waterproof layer. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a partial cross-sectional view of a renovated waterproof structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a partial plan view showing an example of the arrangement of an existing waterproof sheet and an adhesive layer according to the present invention. [Diagram 3] FIG. 2 is a partial plan view showing an example of the arrangement of an existing waterproof sheet and a new waterproof layer according to the present invention. [Figure 4] FIG. 2 is a partial plan view showing an example of the arrangement of an existing waterproof sheet and a new waterproof layer according to the present invention. [Diagram 5] FIG. 2 is a partial plan view showing a state in which an adhesive is applied to an adhesive layer according to the present invention. [Figure 6] FIG. 4 is a partial plan view showing a state in which an adhesive is applied. [Figure 7] FIG. 2 is a partial plan view showing an example of the arrangement of a new waterproof layer according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] The present invention will be described with reference to Fig. 1. An existing waterproof sheet P is laid and fixed on a base S, and an adhesive layer A is provided on the existing waterproof sheet P with an adhesive. Here, the adhesive layer A is formed by continuously applying it across the joints M of the existing waterproof sheet. Then, a new waterproof layer 3 is laid and fixed on the adhesive layer A. The new waterproof layer 3 has a buffer sheet 1 and a new waterproof sheet 2, and the buffer sheet 1 and the new waterproof sheet 2 are laminated and integrated in advance before construction. The buffer sheet 1 is fixed to the adhesive layer A, and the new waterproof sheet 2 is placed on the front side. Here, the joint portion M is approximately the overlapping portion between the existing waterproof sheet P1 and the existing waterproof sheet P2.

[0013] Here, the existing waterproof sheet P and the new waterproof layer 3 are sheets. Therefore, the shorter side of the sheet is the width, and the side that is perpendicular to the width and longer than the width is the length. The width side may be referred to as the width direction, and the length side may be referred to as the length direction.

[0014] As shown in Fig. 2, the joints M of the existing waterproof sheet P include joints M2 parallel to the longitudinal direction of the existing waterproof sheet P and joints M1 provided in the width direction, and adhesive is applied to these joints M1 and M2 so as to continuously cover each of the joints M to provide an adhesive layer A. Although an adhesive layer may be provided over either one of the joints, it is preferable to form an adhesive layer A that covers both of the joints M1 and M2, which is preferable because it reduces the occurrence of cuts and wrinkles in the new waterproof layer 3 in both the longitudinal and width directions.

[0015] When applying the adhesive that forms the adhesive layer A, if the adhesive is applied to match the existing waterproof sheet P, it will be divided into sections for each joint of the existing waterproof sheet P, and the adhesive will not be applied to the entire joint, which is not preferable. Also, when applying the adhesive with a toothed trowel, if the teeth J of the adhesive are arranged in parallel with the joint M as shown in Figure 6, the adhesive will not be applied continuously to cover the joint M, which is not preferable.

[0016] On the other hand, when applying the adhesive using a comb trowel, it is preferable to form the teeth of the adhesive in an arc shape as shown in Fig. 5, because the adhesive is applied in a comb-like pattern to cover the entire joint portion M. Also, when applying the adhesive using a roller, it is preferable to position the roller so as to straddle the joint portion so that the adhesive is applied to the entire joint portion M. In this way, forming a continuous adhesive layer A to cover the joint portion M does not require that the adhesive be applied so as to completely cover the joint portion M, but rather that the adhesive be applied in the form of comb-like streaks that cross the joint portion M to cover the joint portion M.

[0017] The new waterproof layer 3 is made by laminating and integrating a buffer sheet 1 and a new waterproof sheet 2. When the existing waterproof sheet P moves in conjunction with the movement of the base, the buffer sheet 1 prevents that movement from being directly transmitted to the new waterproof sheet 2, preventing the new waterproof sheet 2 from tearing or wrinkling. By laminating and integrating the buffer sheet 1 and the new waterproof sheet 2, the process of joining the buffer sheet 1 and the new waterproof sheet 2 can be eliminated. In addition, the buffer sheet is also fixed to the joints M of the existing waterproof sheet P via the adhesive layer A, and the adhesive and buffer sheet repair the joints M, especially the deteriorated joints M.

[0018] Adjacent new waterproof layers 3 are required to overlap adjacent new waterproof sheets 2 to increase waterproofing. For this reason, it is preferable that the new waterproof layer 3 has a joining piece 4, as shown in Figure 1. The buffer sheet 1 is set to be shorter in width than the new waterproof sheet 2, the buffer sheet 1 is not laminated on the new waterproof layer 3, and the part formed by the new waterproof sheet 2 becomes the joining piece 4. In other words, the joining piece 4 is formed by the new waterproof sheet 2.

[0019] Next, the joining using the joining piece 4 will be explained with reference to Fig. 1. Note that the first new waterproof layer, the second new waterproof layer, and the third new waterproof layer are new waterproof layers, and the first new waterproof sheet and the second new waterproof sheet are new waterproof sheets. The joining piece 42 of the second new waterproof layer 32 is placed on top of the first new waterproof sheet 21, and the joining piece 42 and the first new waterproof sheet 21 are joined together. Therefore, the joint portion N between the first new waterproof layer 31 and the second new waterproof layer 32 is overlapped by the joining piece 42, which is part of the second new waterproof sheet of the second new waterproof layer.

[0020] Here, if the joint M of the existing waterproof sheet P tears or moves, and there is a joint N of the new waterproof layer 3 above the joint M, there is a concern that the upper joint N may also tear. Therefore, as shown in Figure 1, it is preferable to prevent the joint M of the existing waterproof sheet P from overlapping with the joint N of the new waterproof layer 3, as this further reduces the risk of the joint N tearing. In other words, it is preferable to lay and fix the new waterproof layer 3 covering the joint M of the existing waterproof sheet P. Here, if the buffer sheet 1 covers the joint M, the new waterproof layer 3 will cover the joint M. 3 and 4 are partial plan views showing the arrangement of an existing waterproof sheet P and a new waterproof layer 3. The area surrounded by a dotted line indicates one existing waterproof sheet P, and the dotted line indicates a joint portion M. Similarly, the area surrounded by a solid line indicates one new waterproof layer 3, and the solid line indicates a joint portion N. Furthermore, in order to further improve waterproofing, it is preferable to lay the new waterproof layer 3 so as to cover both the longitudinal joint M2 and the lateral joint M1 of the existing waterproof sheet P as shown in Fig. 3. Also, due to restrictions on the arrangement of the existing waterproof sheet P and the new waterproof layer 3, the new waterproof layer 3 may be laid and fixed so as to cover only one of the joints.

[0021] In addition, the new waterproof layer 3 may be laid so that the longitudinal direction of the existing waterproof sheet P and the longitudinal direction of the new waterproof layer 3 are approximately parallel, as shown in Figure 3, or the new waterproof layer 3 may be arranged so that it is approximately perpendicular to the longitudinal direction of the existing waterproof sheet P, as shown in Figure 4.

[0022] Here, when the width of the existing waterproof sheet P and the width of the new waterproof layer 3 are approximately the same, if the existing waterproof sheet P and the new waterproof layer 3 are arranged in parallel as shown in Fig. 3, the joints M of the existing waterproof sheet P and the joints N of the new waterproof layer are likely to overlap vertically. In such a case, it is preferable to arrange the existing waterproof sheet P and the new waterproof layer 3 approximately perpendicularly as shown in Fig. 4, because this prevents the joints M of the existing waterproof sheet P and the joints N of the new waterproof layer 3 from overlapping and allows the new waterproof layer 3 to be arranged to cover at least the joints M1 in the width direction of the existing waterproof sheet P.

[0023] Also, Figure 7 is new FIG. 7 is a partial plan view showing a schematic arrangement of the new waterproof layers 3, in which six new waterproof layers 3 are arranged. When multiple new waterproof layers 3 are laid on an existing waterproof sheet P, the joints of the new waterproof layers 3 form a widthwise joint N1 and a lengthwise joint N2 as shown in Fig. 7. Here, the new waterproof layer 3 has a joint piece 4, and when the joint piece 4 is provided in the lengthwise direction of the new waterproof layer 3, the joint N2 between the adjacent first new waterproof layer 31 and second new waterproof layer 32 is joined and fixed by overlapping the joint piece 42 of the second new waterproof layer 32 on the first new waterproof sheet 21 of the first new waterproof layer 31.

[0024] On the other hand, when the first new waterproof layer 31 and the third new waterproof layer 33 are in contact at their widthwise edges, i.e., when adjacent new waterproof layers 3 are adjacent in areas without connecting pieces 4, the widthwise joint portion N2 can also be overlapped with the adjacent new waterproof layers 3 and joined with an adhesive or the like. It is also preferable to arrange the adjacent first new waterproof layer 31 and third new waterproof layer 33 with their widthwise edge portions butted together, and to join the joint portion N1 formed by the butting together with the same type of joint portion sheet T as the new waterproof sheet 2 so as to cover the joint portion N1. In this way, by joining the joint portion N1 of the new waterproof layer 3 with the same type of joint portion sheet T as the new waterproof sheet 2, the joint strength and stability of the joint portion N1 are increased, which is preferable as it provides higher waterproofness. Moreover, as shown in FIG. 7, by covering and joining a plurality of widthwise joints N1 with a single joint sheet T, workability is simplified and waterproofing is improved, which is more preferable.

[0025] Furthermore, in the embodiment of the present invention, it is preferable that the repair structure be a repair structure over the entire surface of the existing waterproof sheet P. Not only is waterproofing improved by performing a full-scale repair rather than a partial repair, but the embodiment of the present invention is suitable for performing a full-scale repair. Even in the case of a full-scale repair, depending on the parapet or other structure, the surrounding area may be a different construction structure, and it is preferable to repair the approximately flat part of the base of the roof, etc., using the embodiment of the present invention.

[0026] In this way, it is preferable to repair almost the entire surface of the existing waterproof sheet P with the new waterproof layer 3, since this will create a double waterproof layer consisting of the existing waterproof sheet P and the new waterproof layer 3. In this case, it is preferable to inspect the existing waterproof sheet P and carry out repairs to ensure waterproofness.

[0027] The base S may be of any material and structure as long as it is used in conventional waterproof structures such as reinforced concrete, ALC, wood, steel, and metal corrugated roofs.

[0028] The new waterproof layer 3 is formed by laminating and integrating a buffer sheet 1 and a new waterproof sheet 2. As the new waterproof sheet 2, any of the common new waterproof sheets such as polyvinyl chloride resin-based, vulcanized rubber-based, non-vulcanized rubber-based, thermoplastic elastomer-based, olefin-based, and ethylene vinyl acetate resin-based can be used. The novel waterproof sheet 2 may be a single layer of thermoplastic resin, but is preferably a multi-layer product in which a base layer such as glass cloth, glass nonwoven fabric, polyester cloth, or polyester nonwoven fabric is laminated, because of its excellent dimensional stability and tensile strength. The base layer may be provided as the bottom layer, or may be provided in the middle of the thermoplastic resin layers. The thermoplastic resin layer may be a single layer or multiple layers, and each layer may have a different composition. In addition, the existing waterproof sheet P may be constructed in the same manner as the new waterproof sheet 2.

[0029] Here, polyvinyl chloride resin-based new waterproof sheet 2 is preferable because it has excellent flexibility and bonding properties. When a polyvinyl chloride resin-based waterproof sheet or an olefin-based waterproof sheet is used as the existing new waterproof sheet P, it is preferable that the new waterproof sheet 2 of the new waterproof layer 3 is a polyvinyl chloride resin-based waterproof sheet.

[0030] The buffer sheet 1 used for the new waterproof layer 3 may be any material that reduces the movement of the substrate from being transmitted to the new waterproof layer 3 and prevents the new waterproof layer 3 from being torn or wrinkled. Therefore, a sheet-like material with a certain degree of flexibility is preferable, and a foamed sheet or the like is preferably used. As the foamed sheet, polyolefins such as polyethylene, styrenes, and polyurethanes can be used. The buffer sheet 1 is bonded to the existing waterproof sheet P with an adhesive, and is also laminated with the new waterproof sheet 2. Therefore, the other surface of the buffer sheet 1 that is laminated with the new waterproof sheet 2 is bonded to the existing waterproof sheet P with an adhesive. The adhesive part with the existing waterproof sheet P is firmly bonded, and it is preferable that a reinforcing layer such as nonwoven fabric, woven fabric, or paper is provided so that the foamed sheet constituting the buffer sheet 1 does not easily break.

[0031] When the buffer sheet 1 has a reinforcing layer, the fibers used for the nonwoven fabric and woven fabric can be natural fibers such as cotton, wool, hemp, pulp, silk, and mineral fibers, and chemical fibers such as rayon (regenerated fiber), nylon, polyester, polypropylene, acrylic fibers, vinylon, and aramid fibers.

[0032] Here, since the new waterproof layer 3 is bonded and fixed to the adhesive layer A via the buffer sheet 1, in order to make the new waterproof layer 3 less likely to peel off due to wind pressure, it is preferable that the peel strength between the foam sheet and the reinforcing layer such as nonwoven fabric in the buffer sheet 1 is greater than the peel strength between the reinforcing layer and the existing waterproof sheet P. It is also preferable that the peel strength between the foam sheet of the buffer sheet 1 and the new waterproof sheet 2 is greater than the peel strength between the reinforcing layer such as nonwoven fabric and the existing waterproof sheet P. Therefore, when the new waterproof layer 3 is fixed onto the existing waterproof sheet P via the adhesive layer A made of an adhesive, it is preferable that the adhesive undergoes cohesive failure, or that the foam sheet of the buffer sheet 1 undergoes material failure.

[0033] The adhesive that can be used to constitute the adhesive layer A is one that can adequately bond the existing waterproof sheet P and the buffer sheet 1 of the new waterproof layer 3, and examples of such adhesives include epoxy-based, NBR (nitrile rubber)-based, SBR (styrene-butadiene rubber)-based, urethane-based, acrylic-based, etc.

[0034] It is preferable to select an adhesive depending on the existing waterproof sheet and the new waterproof layer. When a polyvinyl chloride resin-based waterproof sheet is used for the existing waterproof sheet P, it is preferable to use an NBR-based adhesive as the adhesive, as this provides sufficient bonding strength. Also, when an olefin-based waterproof sheet is used for the existing waterproof sheet P, it is preferable to use an SBR-based adhesive, as this provides sufficient bonding strength.

[0035] In such a case, the NBR adhesive or SBR adhesive can be applied to the existing waterproof sheet P, and an adhesive may also be applied to the new waterproof layer 3. In particular, when a polyvinyl chloride resin waterproof sheet is used as the existing waterproof sheet P, the NBR adhesive can be applied to both sides of the existing waterproof sheet P and the new waterproof layer 3 to achieve a stronger bond.

[0036] When the existing waterproof sheet P is a polyvinyl chloride resin-based waterproof sheet or an olefin-based waterproof sheet, the method of joining the existing waterproof sheet P to the base may be a mechanical fixing method using fixing screws and fixing disks, or an adhesive method using an adhesive. When using a polyvinyl chloride resin-based waterproof sheet as the existing new waterproof sheet P and using a mechanical fixing method, the polyvinyl chloride resin-based waterproof sheet may be laid on top of the base S, a fixing disk may be placed on top of it, and fixing screws may be driven in to fix the polyvinyl chloride resin-based waterproof sheet with the fixing disk, or a fixing disk may be placed on top of the base and fixed to the base with fixing screws, the polyvinyl chloride resin-based waterproof sheet may be laid on top of the fixing disk, and the polyvinyl chloride resin-based waterproof sheet and the fixing disk may be fixed together using an adhesive applied to the top surface of the fixing disk. In addition, when using a polyvinyl chloride resin-based waterproof sheet as the existing new waterproof sheet P and using an adhesive construction method, NBR-based adhesive can be applied to both sides of the base and the polyvinyl chloride resin-based waterproof sheet, and the polyvinyl chloride resin-based waterproof sheet can be laid and fixed to the base. When using a polyolefin-based waterproof sheet as the existing waterproof sheet P and employing an adhesive construction method, an SBR-based adhesive can be applied to the base and the polyolefin-based waterproof sheet can be laid and fixed to the base. In FIG. 1, an existing waterproof sheet P is fixed to a base S by an adhesive (not shown).

[0037] The joint sheet T can be of the same type as the new waterproof sheet 2. When the new waterproof sheet 2 of the new waterproof layer 3 is a polyvinyl chloride resin-based waterproof sheet, it is preferable to use a polyvinyl chloride resin-based waterproof sheet for the joining sheet as well.

[0038] Here, the joining between the new waterproof sheets 2 of adjacent new waterproof layers 3 is preferably performed by welding with a solvent or fusing with heat, and such joining by fusion is preferable because it has superior stability of the joining strength over time compared to adhesion via an adhesive. If the new waterproof sheet 2 is a polyvinyl chloride resin-based waterproof sheet, the joining piece 4 of the new waterproof layer 3 is also composed of a polyvinyl chloride resin-based waterproof sheet. Therefore, since the joining piece 4 and the new waterproof sheet 2 overlapping with the joining piece 4 are composed of a polyvinyl chloride resin-based waterproof sheet, the joining piece 4 and the new waterproof sheet 2 can be joined by fusion. Also, by using the same polyvinyl chloride resin-based waterproof sheet as the new waterproof sheet 2 for the joint sheet T, the new waterproof sheet 2 and the joint sheet T can be joined by fusion. The solvent used in the solvent welding is preferably a good solvent for the resin constituting the novel waterproof sheet 2. For example, when the novel waterproof sheet 2 is a polyvinyl chloride resin-based waterproof sheet, it is preferable to use THF as the main component.

[0039] Here, if the strength of the existing waterproof sheet P to the base S is insufficient, it is possible to repair the existing waterproof sheet P. If the existing waterproof sheet P is joined by an adhesive method, the part where the joining strength is insufficient can be cut open, adhesive can be applied to the base, and the cut existing waterproof sheet P can be rejoined, or a new waterproof sheet for repair can be laid and fixed to the cut part. In addition, if the existing waterproof sheet P is fixed by mechanical fixing, repairs may be made to the parts that are not sufficiently fixed using fixing discs.

[0040] Next, the construction method of the repaired waterproof structure will be explained with reference to Figures 1 and 2. An adhesive is applied onto the existing waterproof sheet P to form adhesive layer A, and a new waterproof layer 3 is laid and fixed on top of adhesive layer A. Here, adhesive is applied across the joints M of the existing waterproof sheet P.

[0041] More specifically, an existing waterproof sheet P is laid on a base S, and an adhesive is applied on the existing waterproof sheet P to form an adhesive layer A. A new waterproof layer 3, in which a buffer sheet 1 and a new waterproof sheet 2 are laminated and integrated, is laid on the adhesive layer A. An adhesive is applied across the joints M of the existing waterproof sheet P. At this time, the new waterproof layer 3 has a joint piece 4, and a second new waterproof layer is laid and fixed parallel to the longitudinal direction of the first new waterproof layer 31, and the joint piece 42 of the second new waterproof layer is placed on the first new waterproof sheet of the first new waterproof layer and joined by solvent welding. The joining of the joint piece 4 may also be performed by heat fusion. Then, a third new waterproof layer is laid and fixed so as to be adjacent to the edge portion in the width direction of the first new waterproof layer. A strip-shaped joint sheet T is fused to cover the joints N1 of the first new waterproof layer and the third new waterproof layer. Here, the joint tape T is made of the same type of waterproof sheet as the new waterproof sheet 2. EXAMPLES

[0042] An embodiment of the present invention will be described below mainly with reference to FIGS. "Example 1" In FIG. 1, an NBR adhesive is applied on a polyvinyl chloride resin-based waterproof sheet, which is an existing waterproof sheet P. The adhesive is applied continuously to cover the joint M, with the adhesive comb-like pattern formed in an arc shape. As a result, the adhesive comb-like pattern crosses the joint M, forming an adhesive layer A in which the adhesive is covered in stripes at the joint M. The new waterproof layer 3 (31, 32) is formed by laminating and integrating a buffer sheet 1 onto the new waterproof sheet 2 (21, 22). The new waterproof sheet 2 (21, 22) is made of a polyvinyl chloride resin-based waterproof sheet, and the buffer sheet 1 is made of a polyethylene foam sheet laminated with a polyester nonwoven fabric. The new waterproof layer 3 (31, 32) is laid and fixed on the existing waterproof sheet P, with the back side of the new waterproof layer 3 (31, 32), i.e., the polyester nonwoven fabric side of the buffer sheet 1 in contact. At this time, the NBR adhesive is also applied to the polyester nonwoven fabric side as a reinforcing layer of the buffer sheet 1.

[0043] In addition, in FIG. 7, the second new waterproof layer 32 is laid and fixed adjacent to the first new waterproof layer 31 at its longitudinal edge. The second new waterproof layer 32 is provided with a joint piece 42 along the longitudinal direction. Here, since the new waterproof sheets 2 (21, 22) are made of a polyvinyl chloride resin-based waterproof sheet, this joint piece 4 (42) is also made of a polyvinyl chloride resin-based waterproof sheet. The joint piece 42 is superimposed on the first new waterproof sheet 21 of the first new waterproof layer 31, and the joint piece 42 and the first new waterproof sheet 21 are joined by solvent welding. The joint piece 42 and the first new waterproof sheet 21 may be joined by heat fusion. Furthermore, a sealer (not shown) is applied to the edge portions of the joint piece 42 and the first new waterproof sheet 21.

[0044] Furthermore, in FIG. 7, the third new waterproof layer 33 adjacent to the first new waterproof layer 31 at its widthwise edge is also laid and fixed using an NBR adhesive. The third new waterproof layer 33 is fixed in the same manner as the new waterproof layer 3 (31, 32) shown in FIG. 1, and the adhesive is applied continuously to cover the joint M1 by forming an arc-shaped comb of adhesive at the joint M1. The joint N1 between the first new waterproof layer 31 and the third new waterproof layer 33 is formed by butting together. No joint piece is provided at the widthwise edge of the new waterproof layer 3. A joint sheet T narrower than the new waterproof sheet 2 of the new waterproof layer is laid to cover the joint N1, and the new waterproof sheets 31, 33 and the joint sheet T are joined by liquid welding using a solvent. The new waterproof sheets 31, 33 and the joint sheet T may be joined by heat fusion. Furthermore, a sealer (not shown) is applied to the edge portions of the new waterproof sheets 31, 33 and the joint sheet T. The joint sheet T has the same structure and composition as the new waterproof sheet 2. Here, if multiple new waterproof layers are to be laid, the example shown in Example 1 can be repeated as many times as necessary, and a similar repair structure can be achieved over the entire planar portion of the existing waterproof sheet P.

[0045] "Example 2" The existing waterproof sheet P is made of an olefin-based waterproof sheet. In Example 1, by changing the adhesive from NBR to SBR and changing the adhesive application to one-sided application only on the top surface of the existing waterproof sheet, a similar waterproof structure can be obtained.

[0046] "Example 3" The construction method of Example 1 is shown. In Fig. 1, NBR adhesive is applied using a comb trowel onto a polyvinyl chloride resin-based waterproof sheet, which is an existing waterproof sheet P. At this time, the adhesive is applied continuously across the joints M so that the adhesive's comb marks are formed in an arc shape at the joints M. As a result, the adhesive's comb marks cross the joints M, forming an adhesive layer A in which the adhesive is covered in stripes at the joints M. Here, the new waterproof layer 3 is formed by laminating and integrating a buffer sheet 1 onto a new waterproof sheet 2. The new waterproof sheet 2 is made of a polyvinyl chloride resin-based waterproof sheet, and the buffer sheet 1 is made of a polyethylene foam sheet with a polyester nonwoven fabric laminated thereon. The back surface of the new waterproof layer 3, i.e., the polyester nonwoven fabric surface of the buffer sheet 1, is also N BR An NBR-based adhesive is applied, and a new waterproof layer 3 is laid on top of the adhesive layer A on the existing waterproof sheet P so that the polyester nonwoven fabric surface is in contact with the adhesive layer A, and then fixed in place with an NBR-based adhesive.

[0047] In addition, in FIG. 7, the second new waterproof layer (32) has a joint piece 4 provided along the longitudinal direction. Here, since the new waterproof sheets 2 (21, 22) are made of a polyvinyl chloride resin-based waterproof sheet, the joint piece 4 is also made of a polyvinyl chloride resin-based waterproof sheet. The second new waterproof layer 32 is laid and fixed adjacent to the first new waterproof layer 31 and its longitudinal edge portion. Then, the joint piece 42 of the second new waterproof layer 32 is laid on the first new waterproof sheet 21 of the first new waterproof layer 31, and the joint piece 42 and the first new waterproof sheet 21 are joined by solvent welding. The joint piece 42 and the first new waterproof sheet 21 may be joined by heat fusion. Furthermore, a sealer (not shown) is applied to the edge portion of the joint piece 42 and the first new waterproof sheet 21.

[0048] Furthermore, in FIG. 7, the third new waterproof layer 33 is laid and fixed adjacent to the widthwise edge of the first new waterproof layer 31 using an NBR adhesive. The third new waterproof layer 33 is fixed in the same manner as the new waterproof layer 3 (31, 32) shown in FIG. 1, and the adhesive is continuously applied so that the adhesive comb is formed in an arc shape at the joint M1 and covers the joint M1, similar to the joint M2. Here, since no joint piece is provided at the widthwise edge of the new waterproof layer 3, the first new waterproof layer 31 and the third new waterproof layer 33 are laid in abutment. Then, a joint sheet T narrower than the new waterproof sheet 2 of the new waterproof layer 3 is laid so as to cover the joint N1 formed by the first new waterproof layer 31 and the third new waterproof layer 33. The new waterproof sheets 31 and 33 are joined to the joint sheet T by liquid welding using a solvent. The new waterproof sheets 31, 33 and the joint sheet T may be joined by thermal fusion. Furthermore, a sealer (not shown) is applied to the edge portions of the new waterproof sheets 31, 33 and the joint sheet T. The joint sheet T has the same structure and composition as the new waterproof sheet 2. Here, if multiple new waterproof layers are to be laid, the example shown in Example 3 can be repeated the necessary number of times, and the same repair structure can be constructed over the entire surface of the planar portion of the existing waterproof sheet P.

[0049] "Example 4" If the existing waterproof sheet P is composed of an olefin-based waterproof sheet, in Example 3, the adhesive can be changed from NBR to SBR and the adhesive application can be changed to a one-sided application only on the top surface of the existing waterproof sheet, thereby creating a similar construction method for a renovated waterproof structure. [Industrial Applicability]

[0050] According to the present invention, it is possible to provide an adhesive construction method that prevents the generation of noise and vibration during renovation when replacing an existing waterproof sheet that has deteriorated over time with a new waterproof sheet. In addition, the present invention can be used in a waterproof construction and construction method for renovation that can reduce the risk of the joints of the existing waterproof sheet being torn or moved, thereby reducing the risk of the new waterproof sheet being torn or wrinkled. [Explanation of symbols]

[0051] S Base P Existing waterproof sheet A Adhesive layer 1 Cushioning sheet 2. New waterproof sheet 3 New waterproof layer 4 Joint piece M Joints of existing waterproof sheet N New waterproof layer joint T joint sheet

Claims

1. An adhesive layer is provided by applying an adhesive so as to continuously cover the joints of the existing waterproof sheet laid and fixed on the base; A sheet-like new waterproof layer is laid and fixed to the existing waterproof sheet by the adhesive layer, The joint portion is an overlapping portion of adjacent existing waterproof sheets, The novel waterproof layer has a buffer sheet that is bonded to the adhesive layer, and a novel waterproof sheet that is laminated and integrated with the buffer sheet in advance, A renovated waterproof structure in which the cushioning sheet is made of a foam sheet.

2. The repair waterproof structure according to claim 1 , wherein one of the buffer sheets is laid so as to cover the joint portion.

3. The waterproof structure according to claim 1 or 2, wherein the buffer sheet further comprises a reinforcing layer.

4. The repair waterproof structure according to claim 1, wherein the joints of the existing waterproof sheet and the joints of the new waterproof sheet are arranged so as not to overlap.

5. A step of applying an adhesive to continuously cover the joints of a plurality of existing waterproof sheets laid and fixed on a base to form an adhesive layer; and a step of laying and fixing a new waterproof layer on the adhesive layer. The joint portion is an overlapping portion of adjacent existing waterproof sheets, A construction method for a renovated waterproof structure comprising a new waterproof layer, a buffer sheet which is adhered to the adhesive layer, and a new waterproof sheet which has been pre-laminated and integrated with the buffer sheet, the buffer sheet being composed of a foam sheet.

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