JP4241362B2 - Roofing tarpaulin and molding method thereof - Google Patents

Description

  The present invention relates to a roofing waterproof sheet applied to, for example, reinforced concrete (RC), lightweight cellular concrete (ALC) houses, and gradient roofs such as single-flow and double-flow roofs in buildings and the like, and a forming method thereof.

  Conventionally, when forming a sloped roof in a building or house, a foundation tile is constructed as a water-resistant layer on the roof foundation, and tiles such as clay tile, cement tile, metal tile, etc. are used from there. In general, tile-like roof panels such as asbestos slate materials (trade names: color vest, colonial) are used. However, in these, there existed a problem that wind resistance, waterproofness, and workability were inferior.

  On the other hand, instead of the above, a waterproof sheet made of soft synthetic resin, synthetic rubber or the like may be applied. However, it is difficult for the sheet to have a good appearance to be used for a sloped roof, and when a defect such as a crack or a break occurs, there is a problem in durability that the defective part expands and spreads the damage. was there.

Therefore, the present applicant has both the wind resistance, waterproofness, workability in the above-mentioned tiles and panels, and durability against cracks and breaks in the above-mentioned waterproof sheet, a sheet body made of a soft polymer material, A roofing waterproof sheet provided with a protrusion having a specific height and width extending linearly along the surface has been proposed (Patent Document 1).
JP 2001-164711 A

  However, the roofing waterproof sheet has a shape in which a plurality of protrusions extend in a direction perpendicular to the direction in which the gradient is provided and are provided in parallel at a predetermined interval in the gradient direction. There is a problem that the pattern is single and the design is limited. As shown in FIG. 7 of Patent Document 1, it is also conceivable that the streaky protrusions are formed in parallel in the length direction and the width direction, respectively, and arranged in a grid shape, imitating a tile shape or a tile shape. Even if such a shape is applied, it cannot be denied that the shape becomes a single shape, and satisfactory in terms of designability has not been obtained.

  In addition, for the purpose of improving the workability of the waterproof sheet for construction, a long scroll is usually used, but the above-mentioned streaky projections are continuous along the sheet length direction, and along the sheet width direction. In a sheet of a form in which a plurality of parallel shapes are formed at predetermined intervals, the protrusions or the recesses overlap when rolled up in a roll shape, that is, the rough and dense portions in the width direction are overlapped. This occurs extremely, and the length that can be wound becomes shorter than that of a normal flat sheet, and there is a problem that even when the scrolls are stacked on each other, the stability is poor and the load collapses easily. This problem deteriorates the material transportability and increases the cost, and is difficult to place on a sloped roof, which also adversely affects workability.

  Furthermore, in the formation of the above long sheet, it is usually performed by using a roll having a shape in which grooves are engraved at predetermined intervals in the width direction of the surface by an extrusion method capable of continuous forming. In a shape in which the streaks are continuously formed along the sheet length direction, in order to obtain a uniform thickness, the amount of banks (resin pools) in the groove portion of the roll is increased. This adjustment requires technology and time, and the quality of the obtained sheet is difficult to ensure. Accordingly, the discharge amount is limited, which is not preferable in terms of economy.

  Therefore, the present invention can maintain the durability, wind resistance, etc. of the waterproof sheet in the prior art, and can obtain an appearance close to a tile or a tile, for example, and can have a more beautiful appearance and design. And it aims at providing the shaping | molding method of the waterproof sheet for roofing which can wind up stably even if it is long, and the roofing waterproof sheet which can manufacture such a sheet | seat efficiently.

That is, the roofing waterproof sheet of the present invention has the configuration described in the following (1) to (8).
(1) A roofing waterproof sheet that is laid on a sloped roof substrate to form a roof, on the surface of a sheet body made of a soft polymer material having waterproof properties, the thickness of the sheet The unit pattern formed as a boundary with a step formed in the direction is repeated, and a continuous pattern in which the cross-sectional area in the length direction of the sheet is substantially uniform at an arbitrary position in the width direction is formed. Waterproof sheet for roofing.
(2) The roofing waterproof sheet according to (1), wherein the unit pattern has a grid shape in plan view.
(3) The roofing waterproof sheet according to (1) or (2), wherein the height of the step changes into a linear shape or a curved shape.
(4) Of the four sides constituting the boundary of the mesh, the step changes linearly on two sides parallel to either the length direction or the width direction of the sheet, and parallel to the other direction. On the first side of the two sides, the step changes to a concave curve shape that increases at both ends, and on the second side, the step changes to a convex curve shape that decreases at both ends (2) or (3 The roofing tarpaulin described in).
(5) Any one of (1) to (4), wherein the unit pattern is repeated in parallel in any one of the length direction and the width direction of the sheet, and is repeated in a staggered manner in the other direction. The roofing tarpaulin according to claim 1.
(6) The soft polymer material is composed of a soft synthetic resin selected from a soft polyvinyl chloride resin, a polyolefin resin, a vinyl chloride thermoplastic elastomer, and a polyolefin thermoplastic elastomer. The roofing waterproof sheet according to any one of (5).
(7) The roofing waterproof sheet according to any one of (1) to (6), wherein a fiber reinforcing layer is interposed in the middle of the sheet body in the thickness direction.
(8) The roofing waterproof sheet according to any one of (1) to (7), wherein an uneven pattern is formed on an upper surface of the unit pattern.

Moreover, the molding method of the waterproof sheet for roofing of this invention has a structure as described in following (9) (10).
(9) In the method for forming a roofing waterproof sheet described in any one of (1) to (8), a rolling roll on which a unit pattern is patterned so that a length direction of the sheet is a circumferential direction. A method for forming a roofing waterproof sheet, which is formed by rolling a material resin.
(10) The method for forming a roofing waterproof sheet according to (9), wherein the material resin is extruded into a sheet material having a substantially uniform thickness, and then the sheet material is shaped using the rolling roll.

  According to the invention of (1), the step formed at the boundary of the unit pattern forms a shadow, and can be a waterproof sheet having a three-dimensional appearance and a high design appearance, the planar shape and arrangement of the unit pattern, Various appearances can be obtained depending on the height and shape of the step. Further, the stress concentration and the spread of cracks are prevented by the step, and a sheet having excellent durability can be obtained. Furthermore, since the unit pattern is a continuous pattern, the cross-sectional area in the sheet length direction becomes substantially uniform at an arbitrary position in the width direction, and even when a long sheet is wound up, the convex portion on the sheet surface is It can be wound up stably without being biased. Since the wound scroll is less bulky and has good mounting stability, it is hard to collapse even when stacked, and the workability during storage and transportation is also good. In addition, workability on a sloped roof is good.

  According to the invention of (2), a tile-like appearance is obtained.

  According to the invention of (3), the shadow due to the step is rich in change.

  According to the invention of (4), the shape of the unit pattern and the shadow due to the step are further complicated, and an appearance having a high design property is exhibited.

  According to invention of (5), the external appearance close | similar to a roof tile is exhibited.

  According to the invention of (6), since it is excellent in waterproofness and durability, and has good moldability, it can be a waterproof sheet excellent in productivity and economy.

  According to the invention of (7), it is possible to improve the rigidity and strength of the sheet and obtain good shape stability, and more reliably prevent the occurrence of cracks and breaks.

  According to the invention of (8), the designability and aesthetics of the sheet can be further improved.

  According to the method for forming a roofing waterproof sheet according to the invention of (9), it is easy to shape the pattern. Moreover, since the resin supply amount to the rolling roll is substantially uniform in the width direction of the sheet, the resin supply amount can be easily adjusted, a stable sheet shape can be obtained, and the rolling speed can be increased to improve productivity. be able to.

  According to the invention of (10), the shape quality of the waterproof sheet can be further stabilized and the production efficiency can be increased.

  An embodiment of a roofing waterproof sheet according to the present invention will be described in detail with reference to the drawings. In addition, what attached | subjected the same code | symbol in each figure shows the same or equivalent thing, and abbreviate | omits the description which overlaps.

[First Embodiment]
As shown in FIGS. 1A to 1C, the roofing waterproof sheet (1) has two types of unit patterns (11) and (12) in a plane view on the surface of the sheet body (10) in the length direction of the sheet. A continuous pattern is formed alternately and in parallel in (X) and the width direction (Y). The unit patterns (11) and (12) are obtained by changing the thickness of the sheet main body (10) at each side (13) constituting the boundary with the adjacent unit patterns (12) and (11) to obtain a thickness (D ₀ ). This is formed by adding a step (14) having a constant height (D ₁ ) to the basic part of this. The thickness of the convex unit pattern (11) is (D ₀ + D ₁ ), the thickness of the concave unit pattern (12) is (D ₀ ), and each upper surface (15) (16) is flat. It is made with a surface.

  The roofing waterproof sheet (1) has a tile-like appearance by alternately repeating the meshes due to the unevenness, and the step (14) forms a dark shadow so that a three-dimensional feeling is felt.

  The roofing waterproof sheet (1) is a combination of a convex unit pattern (11) and a concave unit pattern (12). The cross-sectional areas differ greatly between unit patterns (11) and (12). However, as shown in FIG. 1B, the cross-sectional area is equalized by repeating the unit pattern in the length direction, and the cross-sectional area as a continuous pattern is uniform at an arbitrary position in the width direction.

[Second Embodiment]
As shown in FIGS. 2A and 2B, the roofing waterproof sheet (2) has a grid-like unit pattern (21) on the surface of the sheet body (10) in parallel in the sheet length direction (X). The pattern is repeated in a zigzag pattern in the width direction (Y).

FIG. 2C shows one unit pattern (21) taken out. In the four sides (23a), (23b), (23c), and (23d) constituting the boundary of the unit pattern (21), the shaded portion of the lower surface side constant thickness (D ₀ ) is a portion that is connected to the adjacent unit pattern. The upper side of the triangle in the side view shows the steps (24a) (24b) (24c) (24d). The height of the step changes linearly on either side and changes in opposite directions on the two opposing sides. That is, the heights (D _2a ) and (D _2c ) of the steps (24a) and (24c) of the sides (23a) and (23c) change in opposite directions, and the steps (24b) ( The heights (D _2b ) and (D _2d ) of 24d) change in opposite directions. Due to these steps, the upper surface (25) of the unit pattern (21) is the lowest on the diagonal line between the two low vertices (26a) and (26c) and is continuous toward the other two vertices (26b) and (26d). It is formed by two inclined surfaces which become higher. Moreover, the minimum value of the sheet thickness of the waterproof sheet (2) is the thickness (D ₀ ) at the diagonal line of the vertices (26a) and (26c), and the maximum value is the thickness at the vertices (26b) and (26d). .

  The roofing waterproof sheet (2) has a first pattern in which the unit pattern (21) is repeated in a zigzag pattern, and the top surface is configured by two inclined surfaces with a change in the height and direction of the step on each side. The shape is more complicated than the waterproof sheet (1) of the embodiment. For this reason, the shadow due to the level difference is rich in change, the stereoscopic effect is increased, and the design is high.

  In the roofing waterproof sheet (2), a cross-sectional view taken along line 3A-3A in FIG. 2B, a cross-sectional view taken along line 3B-3B, and a cross-sectional view taken along line 3C-3C are shown in FIGS. 3A, 3B, and 3C. In these sectional views, P indicates the position on the diagonal line connecting the apexes (26a) and (26c), and indicates the thinnest part of the sheet. As shown in these figures, the cross-sectional area of the waterproof sheet (2) in the sheet length direction is uniform at an arbitrary position in the width direction. Note that the unit pattern (21) of the present embodiment alone is uniform in cross-sectional area in the length direction at an arbitrary position in the width direction.

[Third Embodiment]
The roofing waterproof sheet (3) of the present embodiment shown in FIGS. 4A and 4B is different from the second embodiment only in the method of forming the step of the unit pattern, and the planar shape and arrangement of the unit pattern are the same ( (See FIG. 2A).

FIG. 4B shows one unit pattern (31) taken out. In the four sides (33a), (33b), (33c), and (33d) that constitute the boundary of the unit pattern (31), the hatched portion of the lower surface side constant thickness (D ₀ ) is the portion that is connected to the adjacent unit pattern. The triangular portions (34a) and (34c), the arcuate portion (34d), and the inverted arcuate portion (34b) in the upper side view show the steps. Of the four side steps, the heights (D _3a ) and (D _3c ) of the steps (34a) and (34c) are the same in the two long sides (32a) and (32c) parallel to the sheet length direction (X). It changes in a linear direction. Further, in the first side (32b) of the two short sides facing in parallel with the width direction (Y) of the sheet, the height (D _3b ) of the step (34b) is the apex (36a ) (36b) and changes to a concave curve shape that increases at the middle point (37a) and decreases at the middle point (37a). In the second side (32d), the height (D _3d ) of the step (34d) is the vertex (36c) at both ends of the side. It changes to a convex curve shape that is low at (36d) and high at the middle point (37b). By these steps, the upper surface (35) of the unit pattern (31) is a compound curved surface whose bending direction is reversed in the middle of the long sides (32a) and (32c). Further, the minimum value of the sheet thickness of the waterproof sheet (3) is the thickness (D ₀ ) at the apex (36c) (36d) and the midpoint (37a), and the maximum value is the apex (36a) (36b) and It is the thickness at the midpoint (37b).

  The roofing waterproof sheet (3) has a unit pattern (31) stepped in a straight line and a curved line, and the shape of the upper surface (35) is more complicated than the waterproof sheet (2) of the second embodiment. It has a tile-like appearance. In addition, the change in shadow due to the step became even more complex, and the appearance of the pattern changed slightly depending on the angle of sunlight (time) and the weather, resulting in a high-class design.

  FIG. 5A, FIG. 5B, and FIG. 5C show a sectional view taken along the line 5A-5A in FIG. 4A, a sectional view taken along the line 5B-5B, and a sectional view taken along the line 5C-5C in the roofing waterproof sheet (3). As shown in these figures, the cross-sectional area of the waterproof sheet (3) in the sheet length direction is substantially uniform at an arbitrary position in the width direction. Note that the unit pattern (31) of the present embodiment alone is substantially uniform in cross-sectional area in the length direction at an arbitrary position in the width direction.

  Each of the roofing tarpaulins (1), (2), and (3) described above is a unit pattern (11) that is bordered by steps (14) (24a) to (24d) (34a) to (34d) on the surface. Since a continuous pattern in which (12), (21), and (31) are repeated is formed, it is rich in design. Further, by providing a step at the boundary of the unit pattern, it is possible to prevent the stress concentration and the spread of cracks that occur when the aging deteriorates after the construction, and the waterproof sheet can have excellent durability.

The steps (14), (24a) to (24d), (34a) to (34d) have an effect of recognizing a pattern and producing a stereoscopic effect. The heights (D ₁ ) (D _2a ) to (D _2d ) (D _3a ) to (D _3d ) of the steps (14) (24 a) to (24 d) (34 a) to (34 d) It is preferable to set it to 0.5 mm or more at the highest portion. If it is less than 0.5 mm, the pattern is difficult to recognize at a distance and the stereoscopic effect is poor. On the other hand, if the level difference is too high, practicality as a roofing material is lacking, and construction work is time-consuming. Therefore, the height is preferably 2.5 mm or less. A particularly preferable step is 0.7 to 2.0 mm at the highest portion. The sheet thickness is set to 0.5 to 2.0 mm even at the thinnest part (D ₀ ) in order to ensure the performance required as a roofing material such as strength, rigidity, waterproofness and durability. In particular, 0.8 to 1.5 mm is preferable. Therefore, the total thickness of the sheet including the pattern is preferably 1.0 (minimum value of the thinnest portion (D ₀ ) +0.5 mm of the minimum step) to 6 mm, particularly preferably 1.5 to 5 mm. The average thickness is preferably 1.5 to 5 mm, particularly preferably 1.5 to 4 mm. The average thickness here is the average value of the sheet thickness per unit pattern.

  Further, the shape of the unit pattern is not limited at all, and examples thereof include a polygonal shape, a circular shape, an elliptical shape, a combination of a straight line and a curved line, in addition to the grid shape in the illustrated example. Further, not only one type of unit pattern but also a continuous pattern obtained by combining a plurality of unit patterns is included in the present invention. Moreover, although there is no restriction | limiting also in the planar dimension of a unit pattern, when the external appearance from distant eyes is considered after construction, what set the length of 1 side to 100-500 mm is preferable.

  Also, there is no limitation on the arrangement position of the unit pattern, and the waterproof sheet (1) according to the first embodiment is arranged in parallel in the vertical and horizontal directions, and the waterproof sheet (2) according to the second and third embodiments (2) ( As shown in 3), in addition to the arrangement in which the parallel and staggered patterns are combined, a staggered arrangement in the vertical and horizontal directions and a randomly repeated arrangement can be exemplified. When parallel and staggered are combined, a staggered arrangement in the eaves-building direction parallel to the main building direction is preferable in the construction state. The arrangement has an appearance like a tiled roof and is rich in design. In general, as shown in FIG. 8, the waterproof sheet is often constructed by extending a long sheet along the purlin direction. As shown in FIG. 2A, the unit pattern (21) ( It is preferable to repeat 31) in parallel and in a zigzag manner in the width direction. The roofing waterproof sheet according to the present invention does not limit the construction direction.

  As described above, the roofing waterproof sheet of the present invention can have various appearances depending on the planar shape and arrangement of unit patterns, and the height and shape of steps.

  In addition, the roofing waterproof sheets (1), (2) and (3) have a continuous pattern formed by repeating the unit patterns (11), (12), (21) and (31), and the cross-sectional area in the sheet length direction is wide. It is substantially uniform at any position in the direction. For this reason, even when a long sheet is wound, the convex portion of the sheet surface is not biased and overlapped, and can be wound stably. Since the wound scroll is less bulky and has good mounting stability, it is hard to collapse even when stacked, and the workability during storage and transportation is also good. In addition, workability on a sloped roof is good.

  Furthermore, as shown in FIG. 6, it is also preferable to form a small uneven pattern (42) on the upper surface of the unit pattern (41). The concavo-convex pattern (42) further complicates the pattern and shadow, improving the design and aesthetics. There is no limitation on the shape and height of the uneven pattern (42), and the patterning position may be the entire upper surface or a part thereof.

  Although the overall dimensions of the roofing waterproof sheet are not limited, the sheet width is preferably 300 to 2500 mm and particularly preferably 1000 to 2000 mm in consideration of construction efficiency. That is, if the sheet width is too small, the construction area per sheet is narrowed, the number of sheets applied increases, and workability may be reduced. On the other hand, if the sheet width is too large, handling such as carrying out and unwinding work during laying becomes difficult, and workability may be reduced. A long sheet having a length of 5 m or more is preferable, and such a long sheet is usually handled as a roll. Of course, a panel-like sheet which is short and is not a roll is also included in the present invention.

  The roofing waterproof sheet of the present invention is a soft polymer material having waterproof properties, for example, a soft thermoplastic synthetic resin such as a soft polyvinyl chloride resin, a polyolefin resin, a vinyl chloride thermoplastic elastomer, and a polyolefin thermoplastic elastomer. In addition, it is made of synthetic rubber or the like, and may be formed of a single material or may be formed by laminating one or more materials. These materials are all excellent in waterproofness and durability. In particular, those made of thermoplastic resin can be suitably employed in terms of excellent productivity and economical efficiency of the waterproof sheet because shaping can be easily performed by using rolling or the like.

Further, as shown in FIG. 7, it is preferable that a reinforcing layer (18) made of fibers is interposed in the middle of the sheet body (10) in the thickness direction. In other words, by interposing the fiber reinforcement layer (18), the rigidity and strength of the sheet body (10) can be improved efficiently, good shape stability can be obtained, and the occurrence of cracks, breaks, etc. , Can be more reliably prevented. As the fiber reinforcing layer (18), a woven or non-woven fabric made of inorganic fibers such as glass fibers and organic synthetic fibers such as polyester fibers can be suitably used. Furthermore, the installation height (H) of the fiber reinforcement layer (18) is the basic thickness of the portion excluding the step (17) of the sheet body (10), that is, the thickness of the thinnest portion (D ₀ ). It is preferably set from the side to 0.2D ₀ ~0.5D _0, preferably set particularly 0.2 to 2.0 mm.

[Construction example]
In FIG. 8, the construction example of the waterproof sheet (2) for roofing of 2nd Embodiment is shown. In this construction example, a plurality of roofing waterproof sheets (2) are laid in parallel in a direction in which the length direction (X) is along the main building direction of the roof base (4). Accordingly, the unit patterns (21) are arranged in parallel in the purlin direction (X), and are arranged in a staggered pattern in the eave-ridge gradient direction (Y). Such an appearance is close to that of a tiled house, and a harmonious appearance can be realized even in a townscape lined with tiled houses. Further, as shown in FIGS. 2B and 2C, the upper surface (25) of the unit pattern (21) is formed as an inclined surface having a lower diagonal line, so that rainwater flows through the lowest portion as indicated by an arrow. . For this reason, dust and dirt are easy to flow into the rainwater, and the roof structure is such that the rainwater does not collect easily, and the state of the roof surface can always be kept good.

  In addition, the roofing waterproof sheet (2) is constructed by fixing a fixed disk (5) made of resin-coated steel plate on the roof base (4) and laying the waterproof sheet (2) on the roof base (4). Adhesive the required part of the waterproof sheet (2), the fixing disk (5) by solvent welding or hot air fusing, so-called insulation method, or almost the entire back side of the waterproof sheet (2) A so-called bonding method or the like, which is bonded and fixed to the roof base (4) via the cable, can be suitably used.

  In addition, when laying and constructing a plurality of waterproof sheets (2) in parallel in this way, the end edges of adjacent waterproof sheets are fused or bonded together to join them. Waterproofing can be secured.

  In the construction example described above, the case where the waterproof sheet (2) is applied to a double-flow roof is described. However, the present invention can also be applied to a gradient roof such as a single-flow roof. The laying direction of the waterproof sheet (2) may be the same as the gradient direction in the sheet length direction.

[Method for forming roofing waterproof sheet]
The roofing waterproof sheet according to the present invention includes, for example, as shown in FIG. 9, a rolling roll (50) having a unit pattern patterned so that the length direction (X) of the waterproof sheet (S) is a circumferential direction. It can be formed by forming a continuous pattern while rolling the material resin (51). Further, since the unit pattern is repeatedly shaped by the rotation of the rolling roll (50), a long sheet can be efficiently formed. According to this method, the waterproof sheet (S) having a stable quality can be manufactured even if it is easy to mold and can be shaped with high accuracy, and the circulation speed is increased.

  Further, the cross-sectional area in the length direction of the sheet is substantially uniform at an arbitrary position in the width direction, and the amount of resin supplied in the width direction is substantially constant. For this reason, compared with the adjustment in which the resin supply amount is increased in the protruding portion in the formation of the sheet having the streaky protrusions shown in Patent Document 1, the adjustment of the resin supply amount in the width direction is easier and the stable sheet. The shape can be obtained, and the rolling speed can be increased to improve the productivity.

  For the rolling, a separately manufactured sheet material or a block material resin can be used, but it is preferable to continuously perform extrusion and shaping of the sheet material as in the illustrated example. Specifically, an extrusion device is arranged at the front stage of rolling to extrude a sheet material (52) having a predetermined thickness from a molding die (53) such as a T die, and then using a rolling roll (50). Shape the sheet material (52). According to this method, since the sheet material (52) formed to have a uniform thickness is shaped, high shape stability can be obtained. Moreover, it is still in a sufficiently soft state during cooling immediately after extrusion, and it is not necessary to soften it again, so that production efficiency is good.

  In addition, when the concave / convex pattern (42) is provided on the upper surface of the unit pattern (41) as shown in FIG. 6, if the concave / convex pattern is formed at a required position of the rolling roll (50), the unit pattern (41) is provided. At the same time, an uneven pattern (42) is formed.

  Further, when the fiber reinforcement layer (18) is interposed in the sheet body (10), the fiber reinforcement layer (18) is previously laminated on the surface of the sheet layer having a set height (H) by thermocompression bonding or the like. Prepare the sheet material for the back surface that was allowed to be inserted, and insert the sheet material for the back surface between the rolling rolls (50) in such a manner that the fiber reinforcement layer (18) overlaps the sheet material (52). A method of shaping both materials while thermocompression bonding with the rolling roll (50) can be exemplified.

It is a top view of 1st Embodiment of the waterproof sheet for roofing of this invention. It is the 1B-1B sectional view taken on the line in FIG. 1A. It is the 1C-1C sectional view taken on the line in FIG. 1A. It is a top view of 2nd and 3rd embodiment of the waterproof sheet for roofing of this invention. It is a principal part perspective view of the waterproof sheet for roofing of 2nd Embodiment. Furthermore, it is a principal part expansion perspective view of FIG. 2B. It is the 3A-3A sectional view taken on the line in FIG. 2B. It is the 3B-3B sectional view taken on the line in FIG. 2B. It is the 3C-3C sectional view taken on the line in FIG. 2B. It is a principal part perspective view of the waterproof sheet for roofing of 3rd Embodiment. Furthermore, it is a principal part expansion perspective view of FIG. 4A. It is the 5A-5A sectional view taken on the line in FIG. 4A. It is the 5B-5B sectional view taken on the line in FIG. 4A. It is the 5C-5C sectional view taken on the line in FIG. 4A. It is principal part sectional drawing of other embodiment of the waterproof sheet for roofing of this invention. It is principal part sectional drawing of other embodiment of the waterproof sheet for roofing of this invention. It is a fragmentary perspective view which shows the construction state of the waterproof sheet for roofing. It is a schematic diagram which shows the shaping | molding method of the waterproof sheet for roofing.

Explanation of symbols

1,2,3, S ... Roofing tarpaulin
4 ... Roof foundation
10 ... Seat body
11,12,21,31,41… Unit pattern
14,24a, 24b, 24c, 24d, 34a, 34b, 34c, 34d ... Step
23a, 23b, 23c, 23d, 33a, 33b, 33c, 33d ... side (boundary)
18… Fiber reinforcement layer
42 ... Uneven pattern
50 ... rolling roll
52… Sheet material
53 ... Mold D ₁ , D _2a , D _2b , D _2c , D _2d , D _3a , D _3b , D _3c , D _3d ... Height of step X ... Length direction of sheet Y ... Width direction of sheet

Claims (7)

A roofing tarpaulin that is laid on a roof substrate having a slope to form a roof,
On the surface of the sheet main body made of a soft polymer material having waterproof properties, a unit pattern having a grid shape in plan view with a step formed in the thickness direction of the sheet as a boundary is repeated. A continuous pattern in which the area is substantially uniform at an arbitrary position in the width direction is formed, and two sides parallel to either the length direction or the width direction of the sheet among the four sides constituting the boundary of the grid The step changes into a straight line, the first side of the two sides parallel to the other direction changes into a concave curve shape that increases at both ends, and the step on the second side has a step at both ends. A roofing tarpaulin characterized by being changed to a convex curve that is lowered . The waterproof sheet for roofing according to claim 1 , wherein the unit pattern is repeated in parallel in one of the length direction and the width direction of the sheet, and is repeated in a zigzag manner in the other direction. The soft polymeric material, soft polyvinyl chloride resins, polyolefin resins, vinyl chloride thermoplastic elastomer, according to claim 1 or 2 formed by constituting with a soft synthetic resin selected from the polyolefin-based thermoplastic elastomer Roofing tarpaulin. The roofing waterproof sheet according to any one of claims 1 to 3 , wherein a fiber reinforcing layer is interposed in the middle of the sheet body in the thickness direction. The waterproof sheet for roofing according to any one of claims 1 to 4 , wherein an uneven pattern is formed on an upper surface of the unit pattern. In the molding method of the roofing waterproof sheet according to any one of claims 1 to 5 ,
A method for forming a waterproof sheet for roofing, characterized by forming a material by rolling a material resin using a rolling roll having a unit pattern patterned so that a length direction of the sheet is a circumferential direction. The method for forming a roofing waterproof sheet according to claim 6 , wherein the material resin is extruded into a sheet material having a substantially uniform thickness, and then the sheet material is shaped using the rolling roll.

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