JP4511331B2 - Waterproof sheet - Google Patents

Description

  The present invention relates to a water shielding sheet, and more particularly to a water shielding sheet used in a waste disposal site or a sea surface landfill site.

  As shown in Patent Document 1 below, in a water-proof sheet having a three-layer structure composed of a protective layer made of a nonwoven fabric sheet, a water-proof layer made of a synthetic resin sheet, and a protective layer made of a nonwoven fabric sheet, A method has been proposed in which only the edge portions are not bonded, and the edge portions of each layer corresponding to each other are bonded on site.

  FIG. 7 is a view showing a connection cross section of a water shielding sheet having a five-layer structure connected by this method.

  Referring to the drawing, a state in which each layer of the first water shielding sheet 61 and each layer of the second water shielding sheet 62 are connected to each other to form one large water shielding sheet is shown.

  Specifically, the first water shielding sheet 61 has a rectangular sheet shape in plan view, and has a five-layer structure. That is, a first protective layer 65a made of a non-woven polyester fabric having a rectangular sheet shape and a thickness of 5 mm, and a 3 mm thick chloride bonded to the upper surface of the first protective layer 65a via a first adhesive layer 66a made of an adhesive film. A first water shielding layer 67a made of a vinyl sheet, and a second protective layer made of a polyester nonwoven fabric having a thickness of 5 mm bonded to the upper surface of the first water shielding layer 67a through a second adhesive layer 68a made of an adhesive film. 69 a, a second water shielding layer 71 a made of a vinyl chloride sheet having a thickness of 3 mm and bonded to the upper surface of the second protective layer 69 a via a third adhesive layer 70 a made of an adhesive film, and a second water shielding layer 71 a And a fifth protective layer 73a made of a non-woven fabric made of polyester having a thickness of 5 mm, which is bonded to the upper surface via a fourth adhesive layer 72a made of an adhesive film.

  On the other hand, in the same way, the second water shielding sheet 62 includes the first protective layer 65b, the first water shielding layer 67b, the second protective layer 69b, the second water shielding layer 71b, and the fifth protective layer 73b. 66b, the second adhesive layer 68b, the third adhesive layer 70b, and the fourth adhesive layer 72b.

  And in the range of distance L from the edge of the both sides of the longitudinal direction of the 1st water shielding sheet 61, each protective layer and each water shielding layer are hold | maintained in the state which is not adhere | attached by an adhesive layer. Similarly, the second water-impervious sheet 62 is also held in a state where the protective layers and the respective water-impervious layers are not bonded to each other by the adhesive layer in the range of the distance W from the edge. As described above, in each of the first water shielding sheet 61 and the second water shielding sheet 62, each protective layer and each water shielding layer are integrated by the adhesive layer except for both end edges in the longitudinal direction. At the time of construction at the site, like the three-layer structure water-shielding sheet, the unattached edges of the corresponding layers are overlapped by a distance T in order from the lowest layer and connected by a connection method such as heat fusion. And integrated. At this time, since the end portion of the upper layer to be connected is not bonded as described above, the lower layer can be easily connected by folding it back inward.

JP 2004-154695 A

  In the structure of the conventional water shielding sheet as described above, there has been a problem during connection work in the field.

  FIG. 8 is a cross-sectional view showing a state in the middle of construction of the water shielding sheet having the five-layer structure shown in FIG. 7 in order to explain this problem.

  Referring to the drawing, the connection state of the first protective layer 65a that is the lowest layer of the first water shielding sheet 61 and the first protective layer 65b that is the lowest layer of the second water shielding sheet 62 is shown. . In this state, it is necessary that the first protective layer 65a and the first protective layer 65b are overlapped with each other for the distance T, and the upper four layers are folded back inward. That is, in the first water-impervious sheet 61, the first water-impervious layer 67a, the second protective layer 69a, the second water-impervious layer 71a, and the fifth protective layer 73a are inward from the respective edges by a distance L. Need to wrap to the side.

  However, in order to fold them back inward at the same time, the total thickness thereof becomes considerably large, and thus a great amount of force is required for the wrapping. Moreover, since it is necessary to fix once in the folded state, the folded state must be maintained by placing a weight such as a sandbag on the end of the folded portion. This weight is inevitably heavy because it is necessary to maintain the folded state against the restoring force of the folded state of these four layers, and a great burden is imposed on the handling work. This problem is exactly the same on the second water shielding sheet 62 side. As described above, in the structure of the conventional water-impervious sheet, the work at the site is not easy, and the work efficiency is lowered due to handling of weights and the like.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water-proof sheet having a multilayer structure that facilitates on-site connection work.

  In order to achieve the above object, the invention according to claim 1 is a water shielding sheet comprising a plurality of layers arranged so that edges of each side to be connected to another water shielding sheet are vertically aligned. A first water-blocking layer that overlaps the upper surface of the first protective layer and is bonded to the upper surface of the first protective layer except for a range of a first distance from the edge, and a first water-blocking layer. And a second protective layer that is superposed on the upper surface of the water layer and bonded to the upper surface of the first water shielding layer except for a second distance range that is at least 1.3 times the first distance from the edge. .

  If comprised in this way, when connecting a 1st protective layer, it will become possible to return | fold and fix a 1st water shielding layer and a 2nd protective layer independently.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the second protective layer is overlapped with the upper surface of the second protective layer, and the second distance excluding the third distance range at least 1.3 times the second distance from the edge. A second water-impervious layer bonded to the upper surface of the protective layer, and a second water-impervious layer that overlaps the upper surface of the second water-impervious layer and excludes a range of a fourth distance at least 1.3 times the third distance from the edge. And a third protective layer bonded to the upper surface of the layer.

  If comprised in this way, when connecting each layer sequentially from the lower layer, it becomes possible to fold and fix each of the upper layer independently.

  The invention described in claim 3 is a water-impervious sheet in which a first water-impervious sheet and a second water-impervious sheet composed of the same plurality of layers are integrated by overlapping each edge of the layers, The first water shielding sheet is disposed so as to overlap the first protective layer and the upper surface of the first protective layer, and its edge protrudes outward from the edge of the first protective layer by a first protruding distance. The first water shielding layer bonded to the first protective layer except for the first distance range from the edge of the protective layer is superimposed on the upper surface of the first water shielding layer, and the edge of the first water shielding layer is overlapped with the first water shielding layer. It is arranged so as to protrude outward from the edge by a second protrusion distance, and the second distance is at least 1.3 times the distance obtained by adding the first distance and the first protrusion distance from the edge of the first water shielding layer. A second protective layer adhered to the first water shielding layer except in a range, and the second water shielding sheet is provided on the upper surface of the first protective layer and the first protective layer. The first water-blocking layer is disposed so as to be positioned inwardly by a first recess distance corresponding to the first protruding distance from the edge of the first protective layer and bonded to the first protective layer. And the first water-blocking layer is placed on the upper surface of the first water-blocking layer so that the edge of the first water-blocking layer is positioned inward from the edge of the first water-blocking layer by a second recess distance corresponding to the second protruding distance. And a second protective layer bonded to the water shielding layer.

  If comprised in this way, when connecting the 1st protective layer of a 1st water shielding sheet, it will become possible to return | fold and fix a 1st water shielding layer and a 2nd protective layer independently. The second water-impervious sheet does not have to be folded back at the time of connection.

  According to a fourth aspect of the present invention, in the configuration of the third aspect of the invention, the first water shielding sheet is further superimposed on the upper surface of the second protective layer, and its edge is outward from the edge of the second protective layer. The second protection except for a third distance range that is at least 1.3 times the distance obtained by adding the second distance and the second protrusion distance from the edge of the second protective layer. A second water-impervious layer bonded to the layer and an upper surface of the second water-impervious layer, and the edge of the second water-impervious layer is disposed so as to protrude outward from the edge of the second water-impervious layer by a fourth protruding distance; A third protective layer adhered to the second water shielding layer except for a fourth distance range that is at least 1.3 times the distance obtained by adding the third distance and the third protruding distance from the edge of the water shielding layer. The second water-impervious sheet is further superimposed on the upper surface of the second protective layer and its edge protrudes from the edge of the second protective layer to the third protrusion. The second water shielding layer is disposed inward by a third indentation distance corresponding to the distance, and overlaps the upper surface of the second water shielding layer and the edge thereof is the first. And a third protective layer that is disposed so as to be located inward by a fourth recess distance corresponding to a fourth projecting distance from an edge of the two water barrier layers, and is bonded to the second water barrier layer. .

  If comprised in this way, when connecting each layer of a 1st water-impervious sheet sequentially from a lower layer, it will become possible to return | fold and fix each of an upper layer independently.

  As described above, according to the first aspect of the present invention, when the first protective layer is connected, the first water shielding layer and the second protective layer can be independently folded and fixed. Since each layer can be connected in the state where it is done, the reliability of the water shielding sheet is improved.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 enables each of the upper layers to be independently folded and fixed when sequentially connecting the layers from the lower layer. Since the layers can be connected in a stable state regardless of the number and thickness, the reliability of the water shielding sheet is improved.

  In the invention according to claim 3, when the first protective layer of the first water-impervious sheet is connected, the first water-impervious layer and the second protective layer can be folded back and fixed independently. In this state, each layer can be connected. Further, since the second water shielding sheet can be connected as it is, the connection work is easy and the reliability of the water shielding sheet is improved.

  In addition to the effect of the invention described in claim 3, the invention described in claim 4 can be configured such that when each layer of the first water shielding sheet is sequentially connected from the lower layer, each of the upper layers is independently folded and fixed. Since it becomes possible, since each layer can be connected in a stable state regardless of the number of layers and the thickness, the reliability of the water shielding sheet is improved. Further, since the second water-impervious sheet can be connected as it is, the connection work is facilitated.

  FIG. 1 is a sectional view showing a schematic structure of a water shielding sheet according to a first embodiment of the present invention.

  Referring to the drawing, each of the first water-impervious sheet 11 and the second water-impervious sheet 12 connected to the first impermeable sheet 11 has a five-layer structure including two impermeable layers and three protective layers. It is the same as the conventional water shielding sheet shown in. That is, the first water-impervious sheet 11 has a rectangular sheet shape in plan view, and the width is set to 2 m and the length in the longitudinal direction is set to 50 m in plan view (not shown). Specifically, the structure of the first water-impervious sheet 11 is a first protective layer 15a made of a polyester nonwoven fabric having a rectangular sheet shape and a thickness of 5 mm, and a first adhesive layer 16a made of an adhesive film on the upper surface of the first protective layer 15a. A first water shielding layer 17a made of a polyethylene sheet or a vinyl chloride sheet having a thickness of 3 mm and a first adhesive layer 17a are bonded to the upper surface of the first water shielding layer 17a through a second adhesive layer 18a made of an adhesive film. A second protective layer 19a made of a non-woven polyester fabric having a thickness of 5 mm, and a polyethylene sheet or vinyl chloride made of 3 mm thick bonded to the upper surface of the second protective layer 19a via a third adhesive layer 20a made of an adhesive film A 5 mm thick polyester bonded to the upper surface of the second water shielding layer 21a made of a sheet and the fourth adhesive layer 22a made of an adhesive film on the upper surface of the second water shielding layer 21a. And a fifth protective layer 23a formed of manufacturing a nonwoven fabric.

The edges of each of the five layers constituting the first water-impervious sheet 11 are arranged so as to be vertically aligned as shown in the figure. Thus, although the basic structure of the 1st water-impervious sheet 11 is the same as that of the conventional water-impervious sheet shown in FIG. 7, in this embodiment, the first adhesive layer 16a and the second adhesive layer The construction ranges of the 18a, the third adhesive layer 20a, and the fourth adhesive layer 22a are greatly different. That is, in the first water barrier layer 17a ranges from the edge of the L ₁ is held in a state not bonded via a first adhesive layer 16a on the first protective layer 15a. Note that the distance L ₁ is greater than the overlap space T between each of the second water barrier sheet 12.

In the second protective layer 19a ranges from the edge of the distance L ₂ is held in a state that is not bonded to the first water barrier layer 17a by the second adhesive layer 18a. This distance L ₂ is set to be twice the distance L _1.

In the second water barrier layer 21a in the range of the distance L ₃ from its edge is held in a state that is not bonded to the second protective layer 19a by the third adhesive layer 20a. The distance L ₃ is set to be twice the distance L _2.

In the fifth protective layer 23a is a range of distance L ₄ from its edge is held in a state that is not bonded to the second water barrier layer 21a by a fourth adhesive layer 22a. In addition, the distance L ₄ are set to 2 times the distance L _3.

  Thus, in this embodiment, each layer constituting the first water-impervious sheet 11 is set so that the distance from the edge is not increased as it goes to the upper layer.

  On the other hand, the configuration of the second water-impervious sheet 12 connected to the first water-impervious sheet 11 is also set in the same manner as the first water-impervious sheet 11.

  FIG. 2 is a cross-sectional view showing a connection state of the first water shielding sheet 11 and the second water shielding sheet 12 in FIG.

Referring to the figure, in this figure, a first protective layer 15a which is the lowest layer of the first water-impervious sheet 11 and a first protective layer 15b which is the lowest layer of the second water-impervious sheet 12 are provided. The state at the time of connection is shown. At the time of connection, first, with respect to the fifth protective layer 23a that is the uppermost layer of the first water-impervious sheet 11, a portion that is not bonded to the second water-impervious layer 21a from the edge is turned inward as a folded portion 32 Wrap. That is, the fifth protective layer 23a will be the portion of the range from the edge of the distance L ₄ is folded as the folded portion 32. The folded state is maintained by installing a weight (not shown) on the upper surface of the folded portion 32. Since the folded portion 32 is only one layer of the fifth protective layer 23a, the weight can be light and the handling is easy.

Next, with respect to the second water shielding layer 21a exposed by the folding of the fifth protective layer 23a, a portion that is not bonded to the second protective layer 19a by the third adhesive layer 20a from the edge is used as the folded portion 30. 2 Fold back to the upper surface of the water shielding layer 21a. At this time, since the distance L ₄ is set to be twice the distance L ₃ , the folded portion 30 can be easily folded without contacting the fifth protective layer 23a. This state is maintained by installing a weight 31 on the upper surface of the folded portion 30. Since the folded portion 30 is also a single layer, the folding is facilitated and the weight of the weight 31 is reduced.

Then, similarly to the second protective layer 19a exposed by folding the second water shield layer 21a, a folded portion 28a folded back range from the edge of the distance L ₂ on the inner side, the folded portion 28a The folded state is maintained by installing the weight 29 on the top. Since this case the distance L ₃ is set to twice the distance L _2, it is possible to fold smoothly without the tip of the folded portion 28 contacts the second water barrier layer 21a.

Furthermore, the first water barrier layer 17a exposed similarly by folding the second protective layer 19a, the folded portion 26a folded back range from the edge of the distance L ₁ inward, weigh thereon The folded state is maintained by installing 27a. In this case as well the distance L ₂ is also because it is set to twice the distance L _1, it is possible to easily folded without the tip of the folded portion 26a is in contact with the second protective layer 19a.

  On the other hand, in the second water-impervious sheet 12 as well, the four layers above the first protective layer 15b are folded inward in the same manner as the first water-impervious sheet 11, and folded by installing weights in the respective folded portions. Hold the state. The first protective layer 15a of the first water-impervious sheet 11 and the first protective layer 15b of the second water-impervious sheet 12 that are exposed in this way are installed so as to overlap each other within the range of the distance T. And the 1st protective layer 15a and the 1st protective layer 15b are connected by connection methods, such as heat sealing | fusion, and these are integrated.

  Next, the folded portion 26b of the second water shielding sheet 12 that has been folded is returned onto the first protective layer 15a, and the folded portion 26a of the first water shielding layer 17a that has been folded in the same manner is used as the first water shielding layer. Return them to 17b and superimpose them. At this time, it is preferable to adhere the lower surface of the folded portion 26b, the upper surface of the first protective layer 15a, and the non-adhesive surface of the first protective layer 15b. By adhering this part, it is possible to prevent the end portion from being displaced when the folded portion 26b is connected, and to remove the air reservoir at that part, so that the integrated water shielding sheet can be easily submerged into the sea by the connection. Because it becomes. The adhesion of the lower surface of the folded portion is preferably performed at the time of connecting each layer because the same effect can be obtained at the time of folding each layer thereafter. The first water shielding layer 17a and the first water shielding layer 17b superposed in this manner are heat-sealed by an automatic welding machine. A bonded state is inspected by a pressure test and a reduced pressure test on the joint between the first water shielding layer 17a and the first water shielding layer 17b integrated by heat fusion.

  After the sealability of the first water shielding layer 17a and the first water shielding layer 17b is confirmed by inspection, the folded portion 28b of the second protective layer 19b is returned to the first water shielding layer 17a, and further on the first water shielding layer 17a. 2 The folded portion 28a of the protective layer 19a is returned and overlapped. These are connected by a connection method such as heat fusion to integrate them.

  Similarly, the second water-impervious layer 21b of the second water-impervious sheet 12 and the second water-impervious layer 21a of the first water-impervious sheet 11 are returned and superposed, and these are heat-sealed by an automatic welding machine. Similarly, after the sealing performance is confirmed by the pressure test or the pressure reduction test, the folded portions of the fifth protective layer 23b of the second water-impervious sheet 12 and the fifth protective layer 23a of the first water-impervious sheet 11 Are connected to each other, and these are integrated to complete the connection between the first water shielding sheet 11 and the second water shielding sheet 12.

  FIG. 3 is a cross-sectional view showing a connection state between the first water shielding sheet 11 and the second water shielding sheet 12 thus connected.

  Referring to the drawing, the layers corresponding to each layer of the first water shielding sheet 11 and each layer of the second water shielding sheet 12 are connected within a range of a distance T. In this way, with the structure of the water shielding sheet according to this embodiment, even if the number of layers constituting the water shielding sheet further increases, each layer is easily connected from the lowest layer to the upper layer in order. It becomes possible to do.

  FIG. 4 is a sectional view showing a schematic structure of a water shielding sheet according to the second embodiment of the present invention.

  Referring to the drawings, in this embodiment, each of the first water shielding sheet 11 and the second water shielding sheet 12 connected thereto has a three-layer structure. Are different from each other.

The first water-impervious sheet 11 is a rectangular sheet-shaped first protective layer 15a made of a polyester nonwoven fabric having a thickness of 5 mm, and overlaps the upper surface of the first protective layer 15a, and its edge is the edge of the first protective layer 15a. are arranged so as to protrude by a first protrusion distance W ₁ and more outwardly, the first adhesive layer 16a from the end edge of the first protective layer 15a made of the adhesive film on the first protective layer 15a except the first distance range of L ₁ The first water shielding layer 17a made of a polyethylene sheet or a vinyl chloride sheet having a thickness of 3 mm bonded via the upper surface of the first water shielding layer 17a and the edge of the first water shielding layer 17a are overlapped with each other. It is arranged so as to protrude by a second protrusion distance W ₂ outward from the edge, twice from the end of the first water shield layer 17a distance plus first distance L ₁ between the first protrusion distance W ₁ the exception of a second range of distance L ₂ 1 The aqueous layer 17a through the second adhesive layer 18a made of the adhesive film and a second protective layer 19a consisting of polyester nonwoven fabric having a thickness of 5mm bonded.

On the other hand, the second water-impervious sheet 12 is superposed on the upper surface of the first protective layer 15b and the first protective layer 15b made of a non-woven polyester fabric having a rectangular sheet shape and a thickness of 5 mm, and the edge thereof is the first protective layer 15b. Is disposed so as to be located inward by a first recess distance S ₁ corresponding to a first protrusion distance W ₁ and is bonded to the first protective layer 15 b via a first adhesive layer 16 b made of an adhesive film. And a first water shielding layer 17b made of a polyethylene sheet or vinyl chloride sheet having a thickness of 3 mm and a top surface of the first water shielding layer 17b, and an edge thereof is second from the edge of the first water shielding layer 17b. It is arranged to be positioned inwardly by a distance S ₂ second recess corresponding to the protrusion distance W _2, an upper surface to a thickness that is adhered via a second adhesive layer 18b made of the adhesive film of the first water shield layer 17b 5mm polyester And a second protective layer 19b made of a non-woven fabric.

  FIG. 5 is a cross-sectional view showing a state of connection of the water shielding sheet shown in FIG. 4 on site.

  Referring to the figure, in connecting the first water-impervious sheet 11 and the second water-impervious sheet 12, first, the first water-impervious sheet 17a is formed from the edge of the second protective layer 19a of the first water-impervious sheet 11. The folded portion 28 is folded inward as a folded portion 28, and a weight 29 is placed on the upper surface thereof to maintain the folded state. Since the second protective layer 19a is folded back by only one layer, it is easily folded back, and the weight of the weight 29 that holds the folded state is reduced.

Next, the first water shielding layer 17a exposed by the folding of the second protective layer 19a is folded inward from the end edge of the first water shielding layer 17a as a folded portion 26 and overlapped thereon. The folded state is maintained by installing the shim 27. At this time the second distance L ₂ is set to 2 times the distance plus first protrusion distance W ₁ to the first distance L _1, is not the tip of the folded portion 26 is in contact with the second protective layer 19a . Further, since the first water shielding layer 17a is also folded back by only one layer, it is easily folded back, and the weight of the weight 27 for maintaining the state can be reduced.

Then superimposed distance T on the upper surface of the first protective layer 15b of the second water shield sheet 12 exposed by the distance S ₁ of the first protective layer 15a, which is exposed first recess by folding of the first water shield layer 17a Install as follows. At this time for the second water-impervious sheet 12 side end edge only inwardly a distance S ₁ is the first water barrier layer 17b first recess is located, the edge portions of the first protective layer 15a first There is nothing that hinders installation on the protective layer 15b.

In this state, the edge portion of the first protective layer 15a and the edge portion of the first protective layer 15b are connected by a connection method such as heat fusion to integrate them. Next, the folded portion 26 of the first water shielding layer 17a is returned to the first protective layer 15a side. Also in this case, as in the previous embodiment, the lower surface of the folded portion 26, the non-adhesive surface of the first protective layer 15a, and the exposed surface of the second protective layer 15b may be bonded. And air retention can be prevented. The adhesion of the lower surface of the folded portion is preferably performed at the time of connecting each layer, since the same effect can be obtained at the time of folding each layer thereafter. At this time, since the edge of the first water barrier layer 17a is projecting first protrusion distance W ₁ only the outer side than the end edge of the first protection layer 15a, the edge of the first water barrier layer 17a is first It overlaps with the range of the distance T on the edge part of the water-impervious layer 17b. In this state, the first water shielding layer 17a and the first water shielding layer 17b are heat-sealed by an automatic welding machine. Then, the bonding state is inspected by a pressure inspection or a pressure reduction inspection on the joint.

After the sealing property between the first water shielding layer 17a and the first water shielding layer 17b is confirmed by the inspection, the folded portion 28 of the second protective layer 19a is returned and overlapped on the first water shielding layer 17a side. At this time the tip of the second protective layer 19a is projecting second protrusion distance W ₂ only the outer side than the end edge of the first water shield layer 17a, in its edge the edge portion of the second protective layer 19b It overlaps in the range of the distance T. In this state, the second protective layer 19a and the second protective layer 19b are connected by a connection method such as heat fusion and integrated to form the first water shielding sheet 11 and the second water shielding sheet 12. Connection is complete.

  FIG. 6 is a cross-sectional view showing a connection state between the first water shielding sheet 11 and the second water shielding sheet 12 integrated as described above.

  Referring to the figure, the connection position of each layer is not vertically aligned unlike the previous embodiment, and is located in an oblique direction. In this embodiment, unlike the previous embodiment, only the layers of the first water-impervious sheet 11 need be folded, and the second water-impervious sheet 12 need not be folded at all. Therefore, the efficiency of connection work as a whole is improved.

  Further, in this embodiment, the water-impervious sheet has a three-layer structure, but the first water-impervious sheet 11 has the same concept even if it has a five-layer structure as in the previous embodiment. By folding back only the side, it is possible to easily connect to the second water-impervious sheet 12 and integrate them as a water-impervious sheet having a five-layer structure.

  In each of the above-described embodiments, the portion of the upper layer that is not bonded is folded back. However, this portion may be fixed by winding the portion instead of folding. In this case, the distance that each layer does not adhere is set in each of the above embodiments so that the distance that the lower layer does not adhere is multiplied by a factor of 2 on the premise of complete folding of the lower layer. Considering this, this coefficient is preferably at least 1.3 times. However, depending on the folding method, it is possible to increase the coefficient to about 1.1 times or 1.2 times.

  In each of the above embodiments, the folded portion of each layer is fixed by being overlapped, but it may be configured to hold the folded state using a flat fastener or the like instead.

  Further, in each of the above-described embodiments, the overlapping allowance of each layer is the same, but the overlapping allowance may be set to be different for each layer.

  Further, in each of the above embodiments, the material and thickness of the water shielding layer and the protective layer are specified. However, these materials may be other materials, and the thickness may be other thickness. Needless to say, it may be.

  Furthermore, in each of the above embodiments, it is assumed that a maximum of five layers of water-impervious sheets are connected. Needless to say, the present invention can also be applied to a water-impervious sheet composed of a larger number of layers.

It is sectional drawing which showed schematic structure of the water-impervious sheet by 1st Embodiment of this invention. It is sectional drawing which showed the state in the middle of the connection of the water-impervious sheet shown in FIG. It is sectional drawing which showed the state which the connection of the water shielding sheet shown in FIG. 2 was completed. It is sectional drawing which showed schematic structure of the impermeable sheet by 2nd Embodiment of this invention. It is sectional drawing which showed the state in the middle of the connection of the water shielding sheet shown in FIG. It is sectional drawing which showed the state which the connection of the water shielding sheet shown in FIG. 4 was completed. It is sectional drawing which showed the connection state of the conventional water shielding sheet. It is sectional drawing which showed the state in the middle of the connection of the water-impervious sheet shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... 1st water shielding sheet 12 ... 2nd water shielding sheet 15 ... 1st protective layer 16 ... 1st adhesive layer 17 ... 1st water shielding layer 18 ... 2nd adhesive layer 19 ... 2nd protective layer 20 ... 3rd adhesion | attachment Layer 21 ... 2nd water shielding layer 22 ... 4th adhesive layer 23 ... 5th protective layer In addition, the same code | symbol in each figure shows the same or an equivalent part.

Claims (4)

A water-impervious sheet comprising a plurality of layers arranged such that the edges of the sides to be connected to other water-impervious sheets are vertically aligned,
A first protective layer;
A first water shielding layer that is superimposed on the upper surface of the first protective layer and bonded to the upper surface of the first protective layer except for a range of a first distance from the edge;
A second protective layer superposed on the upper surface of the first water shielding layer and bonded to the upper surface of the first water shielding layer except for a second distance range of at least 1.3 times the first distance from the edge; Water shielding sheet with A second water shielding layer which is superimposed on the upper surface of the second protective layer and bonded to the upper surface of the second protective layer except for a third distance range of at least 1.3 times the second distance from the edge;
A third protective layer superimposed on the upper surface of the second water shielding layer and bonded to the upper surface of the second water shielding layer except for a range of a fourth distance at least 1.3 times the third distance from the edge; The water shielding sheet according to claim 1, further comprising: A water-impervious sheet that integrates a first water-impervious sheet and a second water-impervious sheet composed of the same plurality of layers by overlapping each edge of the layers,
The first water shielding sheet is
A first protective layer;
The upper edge of the first protective layer overlaps with the upper edge of the first protective layer, and the edge of the first protective layer protrudes outward from the edge of the first protective layer by a first protruding distance. A first water shielding layer adhered to the first protective layer except for a range of one distance;
The end of the first impermeable layer is disposed so as to overlap the upper surface of the first impermeable layer and its edge protrudes outward from the end of the first impermeable layer by a second protruding distance. A second protective layer bonded to the first water shielding layer except for a second distance range that is at least 1.3 times the distance obtained by adding the first distance and the first protruding distance from an edge;
The second water shielding sheet is
A first protective layer;
The first protective layer is overlaid on the upper surface of the first protective layer, and the edge of the first protective layer is disposed inward from the edge of the first protective layer by a first recess distance corresponding to the first protruding distance. A first water shielding layer bonded to one protective layer;
It is arranged so as to overlap with the upper surface of the first water shielding layer and the edge thereof is located inward by a second dent distance corresponding to the second protruding distance from the edge of the first water shielding layer, A water shielding sheet comprising a second protective layer bonded to the first water shielding layer. The first water shielding sheet further includes:
The upper edge of the second protective layer is overlapped with the edge of the second protective layer so that the edge protrudes outward from the edge of the second protective layer by a third protruding distance. A second water shielding layer adhered to the second protective layer except for a range of a third distance that is at least 1.3 times the distance obtained by adding two distances and the second protruding distance;
It is arranged so as to overlap the upper surface of the second water shielding layer and its edge protrudes outward from the edge of the second water shielding layer by a fourth projecting distance, from the edge of the water shielding layer. A third protective layer bonded to the second water shielding layer except for a range of a fourth distance that is at least 1.3 times the distance obtained by adding the third distance and the third protruding distance;
The second water shielding sheet further includes:
The upper edge of the second protective layer overlaps with the edge of the second protective layer so that the edge of the second protective layer is positioned inward from the edge of the second protective layer by a third recess distance corresponding to the third protruding distance. A second water shielding layer adhered to the two protective layers;
It is arranged so as to overlap with the upper surface of the second water shielding layer and the edge thereof is located inward by a fourth recess distance corresponding to the fourth protruding distance from the edge of the second water shielding layer, The water shielding sheet according to claim 3, further comprising a third protective layer bonded to the second water shielding layer.

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