JP2016017304A - Flat roof tile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat roof tile that prevents rainwater leakage to a rear surface side even when laid with soil in stripes on a gently inclined roof.SOLUTION: A flat roof tile 10 has a roof tile body 12 with a front plate part 11 on a first side and a back plate part on a second side, and the front plate part 11 is overlapped with the back plate part 13 when laying the roof tiles on a roof. A first and a second jetty parts 15, 16 are formed toward a downstream side from an upstream side, at an edge part on the first side of the front plate part 11 and an edge part on the second side of the roof tile body 12. When laying the flat roof tiles 10 on a roof, the first and the second jetty parts 15, 16 contact each other or come close to form a joint part 14. A drainage groove 19 is formed on the rear plate part 13 for guiding rainwater that seeped from the joint part 14 toward the downstream side, and the drainage groove 19 is off-center on the rear plate part 13 toward the second side.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flat roof tile that prevents rainwater leakage even if a roof with a gentle slope is lined up so that matching portions of tiles adjacent to each other in the left-right (column) direction are arranged in a line.

Flat roof tiles are attracting attention from the viewpoints of weight reduction of tiles, ease of roofing, and the appearance of the roof. Here, the flat roof tile has a tiled structure in which rainwater enters from the mating part between the flat roof tiles adjacent in the left-right direction, and the height of the water jetty jetty formed on both sides in the left-right direction on the surface side of the flat roof tile. In general, flat roof tiles that are adjacent to each other in the horizontal direction by shifting the horizontal position of the flat roof tiles up and down by half the width of the roof tiles because rainwater can easily enter the mating area beyond the jetty, etc. A staggering (bricking) is performed in which the mating parts are lined up in a vertical direction so that rainwater infiltrated from the mating part is discharged to the center of the flat tiles sown on the lower side (eave side) I have to.

However, if staggering is performed, it is necessary to cut part of the flat roof tiles that go to both ends of the roof in the left-right direction and to cut the flat tiles along the left-right direction. The problem that construction efficiency deteriorates arises.
In addition, when replacing damaged flat roof tiles, the number of flat roof tiles that need to be removed for replacement is increased, except when the flat roof tile to be replaced has been rolled up at the top. In addition to the problem of complications, it is necessary to destroy fastening members such as nails used to fix the flat roof tiles and ribs to prevent the flat roof tiles from being blown up along with the replacement work. There is a problem that the disaster prevention performance cannot be maintained after the tile replacement.

For this reason, it is possible to spread flat tiles along the vertical direction, and the number of flat tiles that need to be removed for tile replacement is small, so that the disaster prevention performance can be maintained even if tile replacement is performed. Is preferred. However, when the flat roof tiles are lined up, the mating portions of the flat roof tiles adjacent to each other in the left-right direction are arranged on the same straight line as the mating portions of the flat roof tiles adjacent to each other in the horizontal direction on the lower side. Since the lower end side overlaps with the upper end side of the lower mating portion, there is a problem that rainwater that has entered the upper mating portion further enters the lower mating portion and rain leakage occurs.
Therefore, the water attracting water is covered with the upper overlapping part formed on one side of the flat roof tile and inclined outward and on the head side of the upper side of the lower overlapping part formed on the other side of the adjacent flat roof tile. A flat roof tile for stroking has been proposed in which a jetty is provided and a drainage cut is provided in a portion immediately above the water jetty jetty in the water return formed along the outer side of the lower overlapping portion (for example, Patent Document 1). reference).

JP 2001-164702 A

Here, in the flat roof tile described in Patent Document 1, rainwater that has entered from the mating portion of the flat roof tiles adjacent in the left-right direction flows down on the lower overlapping portion and is guided outward by the diversion jetty, It falls on the lower part of the flat roof tile diagonally below the notch, and is guided to the valley side through the upper surface of the lower base and the diversion groove, and the vertical flat roof tile and the lower flat roof tile It is configured to be discharged to the outside through a gap between the upper surfaces.
For this reason, when the flat roof tile described in Patent Document 1 is spread on a roof with a gentle slope (for example, a 3 dimensional slope in the industry), the amount of rainfall exceeds the discharge capacity of the flat roof tile as in the case of heavy rain. If rainwater accumulates on the upper surface, or if there is a strong crosswind and the rainwater discharged to the upper surface of the lower flat roof tiles flows backward, the rainwater cannot be sufficiently discharged from the lower area, and the rainwater flows into the lower area. The problem of leaking to the back side of the flat roof tile occurs.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flat roof tile capable of preventing leakage of rainwater to the back surface side even when stroking on a gently-sloped roof.

The flat roof tile according to the present invention that meets the object has a roof main body provided with a front plate portion on one side and a back plate portion on the other side, and the front plate portion on the back plate portion at the time of construction. In the flat tiles that overlap,
First and second piers are provided from one upstream end to the other downstream end portion of the front plate portion and the other end portion of the roof tile main body. The second jetty abuts or closes to form a mating portion, and the back plate portion is provided with a drainage groove that guides rainwater entering from the mating portion and drains it downstream, and the drainage groove is It is eccentric to the other side from the center of the back plate.
Since the drainage groove is eccentrically provided on the other side from the center of the back plate part, it can be drained to a place shifted to the other side from the mating part of the flat roof tiles, and the drained rain water is Intrusion into the mating part can be prevented.

In the flat roof tile according to the present invention, it is preferable that the back plate portion is provided with an inclined portion that guides rainwater entering from the mating portion to the drainage groove.
Thereby, the rainwater that has entered from the mating portion can surely flow into the drainage groove.

The flat roof tile which concerns on this invention WHEREIN: It is preferable that the 1st ejector-type drainage part which accelerates and drains the flowing rainwater is provided in the downstream part of the said drainage groove.
Thereby, drainage of rainwater in the drainage groove can be promoted, and rainwater can be prevented from flowing backward from the drainage groove.

In the flat roof tile according to the present invention, on the downstream side of the one side end portion of the front plate portion and the downstream side of the other side end portion of the roof tile body, one side and the other side are opened, respectively, and the lower side during construction It is preferable that the 1st, 2nd notch part in which the upper part of the said 1st, 2nd jetty of this arrange | positioned flat roof tile fits is formed.
As a result, when the flat roof tiles are rolled up and down while part of the flat roof tiles are overlapped, the upper flat roof tile matching portions can be arranged in a vertical line with respect to the lower flat roof tile matching portion. The drainage groove of the flat roof tile can always be shifted to the other side with respect to the mating portion of the lower flat roof tile.

In the flat roof tile according to the present invention, the upstream end portion of the roof tile body and the front plate portion extends in a lateral direction and is continuous to prevent backflow of rainwater from the roof tile body and the front plate portion. It is preferable that a jetty is provided.
Thereby, it is possible to prevent the backflow of rainwater from the tile main body and the front plate portion even on a gently-sloped roof.

In the flat roof tile according to the present invention, on the front side of the roof tile main body, a plurality of fourth jetty jets are provided from the upstream to the downstream, which act as ribs and running water guides, and the channel is sandwiched by the fourth jetty It is preferable that the 2nd ejector type drainage part is provided in the downstream edge part.
By providing the fourth jetty, rigidity and strength can be maintained even if the thickness of the tile main body and the front plate portion is reduced, and the weight of the flat roof tile can be reduced.
By providing the second ejector-type drainage section, drainage of rainwater in the flow channel can be promoted, and rainwater can be prevented from flowing backward from the flow channel.

In the flat roof tile according to the present invention, a stopper is provided at the center of each of the flow channels, and a latching portion that contacts the stopper is provided on the back side of the roof tile body so that the flat roof tiles can be displaced. It is preferable to prevent.
Thereby, the vertical positioning of the flat roof tile can be easily performed.

In the flat roof tile according to the present invention, it is possible to prevent drained rainwater from entering the mating section of the lower flat roof tile, by draining to a place shifted to the other side from the flat roof tile mating section. It becomes possible to train. As a result, it is possible to improve the workability of the flat roof tile work, improve the workability of the flat roof tile replacement, and maintain the disaster prevention performance after the flat roof tile replacement.

It is a top view of the flat roof tile which concerns on one embodiment of this invention. It is a top view which shows the state of the same flat tile adjacent to the left-right direction and an up-down direction. It is AA arrow sectional drawing of FIG. It is a front view of the flat tile. It is a rear view of the plane roof tile. It is a right view of the same flat roof tile. It is a left view of the flat roof tile.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1-7, the flat roof tile 10 which concerns on one embodiment of this invention has the roof main body 12 by which the front-plate part 11 was provided in the one side, and the backplate part 13 was provided in the other side. At the time of construction, the front plate portion 11 overlaps the back plate portion 13. Note that the surfaces of the tile body 12 and the front plate portion 11 are connected to form a tile surface 18, and the back surfaces of the tile body 12 and the back plate portion 13 are connected to form a tile back surface 18 a.

And the 1st, 2nd jetty 15 and 16 are provided in the one side edge part of the surface board part 11, and the other side edge part of the tile main body 12 toward the downstream from the upstream, The first and second jetties 15 and 16 are in contact with or close to each other to form a mating portion 14, and the drainage groove 19 that guides rainwater that has entered from the mating portion 14 to the back plate portion 13 and drains it downstream. The drainage groove 19 is eccentric from the center of the back plate portion 13 to the other side. In addition, the upstream ends of the roof tile body 12 and the front plate portion 11 (the roof tile surface 18) extend in the lateral direction and are continuous (the upstream ends of the first and second jetty 15 and 16 are connected to each other). ), A third jetty 17 for preventing the backflow of rainwater from the roof tile body 12 and the front plate portion 11 is provided.

On the front side of the back plate part 13, a slope is formed between the other side end of the tile body 12 and the drainage groove 19 from the other side end of the tile body 12 toward the drainage groove 19, and the mating part 14 An inclined portion 21 is provided to guide rainwater that has entered from the drainage groove 19 to the drainage groove 19. Furthermore, a first ejector-type drainage section 20 that accelerates and drains the flowing rainwater is provided at the downstream portion of the drainage groove 19.
Here, the first ejector-type drainage section 20 is provided with a flat downward slope surface that is gradually narrower than the width of the drainage groove 19, or a reverse slope surface downward slope surface. Rainwater is accelerated in the longitudinal direction of the drainage groove 19 based on (gravity).

On the front side of the tile body 12, three (a plurality of examples) fourth jetty jets 22 are provided from the upstream side to the downstream side that act as ribs and running water guides. Here, the height of the fourth jetty 22 with respect to the surface of the roof tile body 12 is preferably set equal to the height of the first and second jetty 15 and 16. The width of the fourth jetty 22 is the same as that of the first jetty 15 and the second jetty when the front plate portion 11 overlaps the back plate portion 13 of the adjacent flat roof tile 10 to form the mating portion 14. It is preferable to set a value equal to the total sum of the widths of the jetty 16.

And the water flow path 22a pinched | interposed by the 4th jetty 22, the water flow path 22b pinched by the 4th jetty 22 of one side and the 1st jetty 15 adjacent to that, the 4th jetty 22 of the other side, and the A second ejector-type drainage unit 23 is provided at the downstream end of the water channel 22c sandwiched between the adjacent second jetty 16. The second ejector-type drainage section 23 is provided with a flat descending inclined surface that is gradually narrower than the width of the flowing water channels 22a, 22b, and 22c, or a reverse inclined curved surface. The rainwater is accelerated and drained in the longitudinal direction of the flow channels 22a, 22b, and 22c based on the drop (gravity).

Furthermore, a stopper 24 is provided at the center of the water flow paths 22b and 22c respectively disposed at the center of the water flow path 22a and on both sides of the water flow path 22a. In addition, the back side of the tile body 12 and the front plate part 11, for example, the lower part of the tip of the second ejector-type drainage part 23 provided at the downstream end of each of the flow channels 22a, 22b, 22c, A latching portion 25 that abuts against a stopper 24 provided on the flat roof tile 10 on the side is provided. Here, the stopper 24 can be a protrusion having a surface parallel to the left-right direction on the side facing the latching portion 25, and the latching portion 25 extends in the left-right direction on the side facing the stopper 24. It can be a ridge.

As shown in FIG. 4, the lower part of the front end of the second ejector-type drainage part 23 of the flow channel 22b, for example, the downstream side of the one side end part of the front plate part 11 and the downstream side of the other side end part of the roof tile body 12. The first cutout portion into which the upper portion of the first jetty 15 of the flat roof tile 10 is opened at one side and fitted at the lower side at the time of construction is inserted into one end portion of the latching portion 25 provided in 32 is a flat plate that opens to the other side at the other end of the hook 25 provided at the lower end of the second ejector-type drainage 23 of the water flow channel 22c and is arranged at the lower side during construction. A second notch 33 into which the upper part of the second jetty 16 of the roof tile 10 is fitted is formed. Further, a third upper portion of the fourth jetty 22 is fitted between the hook portions 25 provided at the lower portion of the tip of the second ejector-type drainage portion 23 of the flow channels 22a, 22b, and 22c. A notch 34 is formed.

In addition, the code | symbol 26 shown in FIGS. 1-3 is the back surface side of the area | region pinched | interposed by the 1st, 4th jetty 15 and 22, the back surface side of the area | region pinched | interposed by the adjacent 4th jetty 22, 4, projecting ridges formed along the vertical direction at the center in the width direction on the back side of the region sandwiched between the second jetty 22 and 16. Reference numeral 27 denotes a flat plate which is formed on the third jetty 17 and which hangs upward when the latching portion 25 of the roof tile body 12 is hooked on the stopper 24 provided on the roof tile body 12. This is a fitting groove into which the protruding strip 26 of the tile body 12 of the tile 10 is fitted.

Reference numeral 28 shown in FIG. 5 is a hooking part for hooking the tile main body 12 to a plinth (not shown) attached to the field board when rolling the flat roof tile 10 of the roof, reference numeral 29 shown in FIG. Reference numerals 30 and 31 denote insertion portions through which fastening members (for example, screws with packing) for fixing the tile body 12 to the roof are inserted. In addition, the insertion parts 29 and 30 are formed in the flat roof tile 10 in a state where the upper side is sealed, and are opened and used during construction. On the other hand, the insertion part 31 is formed in the flat roof tile 10 in a penetrating state.

Here, when the flat roof tile 10 is attached to the roof along the vertical direction, the flat roof tile 10 that is first attached to the eaves side is fixed to the roof by a fastening member inserted through the opening insertion portion 30. And when attaching the next flat roof tile 10 to the upper side of the flat roof tile 10 fixed to the roof, the penetration part 29 of the flat roof tile 10 to open is opened and the penetration part 31 penetrated formed in the lower flat roof tile 10 is opened. Alignment is performed so that the insertion portion 29 opened with respect to is in a communicating state. And the penetration part 31 of the lower flat roof tile 10 which was in the communication state is penetrated, and it fixes to the roof by the front side of one fastening member inserted from the insertion part 29 which the flat roof tile 10 to open attaches. Thereby, the upper flat roof tile 10 can be attached to the roof via the lower flat roof tile 10.

As shown in FIGS. 1 and 3, the longitudinal length P of the tile surface 18 is, for example, 300 to 400 mm, and the lateral length Q is, for example, 400 to 500 mm. Further, the lateral length K of the roof tile body 12 is, for example, 250 to 310 mm, and the width R of the front plate portion 11 and the width S of the back plate portion 13 are substantially equal, for example, 40 to 50 mm. On the other hand, the longitudinal length T of the back plate portion 13 is set to be, for example, 15 to 25 mm shorter than the longitudinal length P of the tile surface 18 (front plate portion 11). Thereby, the 1st ejector-type drainage part 20 of the drainage groove 19 provided in the backplate part 13 can be covered with the surface board part 11 of the adjacent flat roof tile 10, and when the flat roof tile 10 is spread on the roof The landscape (appearance) can be improved.

Here, the height of the 1st-3rd jetty 15-17 with respect to the tile surface 18 is 3-10 mm, for example. If the height of the 1st-3rd jetty 15-17 is less than 3 mm, when the rain water collected on the tile surface 18 receives a wind, it can easily cross the 1st-3rd jetty 15-17. Therefore, it is not preferable. On the other hand, if the height of the first to third jetties 15 to 17 exceeds 10 mm, it is difficult to provide a downward slope on the upper flat roof tile 10 when the flat roof tile 10 is spread on a gently-sloped roof. It is not preferable.
Moreover, the width | variety of the 1st-3rd jetty 15-17 is 3-10 mm, for example. If the width of the first to third jetty 15 to 17 is less than 3 mm, the strength against the impact of the first to third jetty 15 to 17 is reduced, and the first to third jetty 15 to 17 are easily damaged. Absent. On the other hand, if the width of the first to third jetty 15 to 17 exceeds 10 mm, the weight of the flat roof tile 10 increases, which is not preferable.

The thickness of the tile main body 12 does not have a constant thickness because a region having a downward slope from upstream to downstream is provided, but it is necessary to adjust the thickness to a range of 10 to 15 mm, for example. Ensures rigidity and strength. The thickness of the front plate portion 11 and the thickness of the back plate portion 13 are set to 5 mm to ensure the rigidity and strength of the front plate portion 11 and the back plate portion 13. In addition, when the back plate portion 13 is covered with the front plate portion 11 of the adjacent flat roof tiles 10, the surface of the roof tile body 12 (the roof surface 18) of the adjacent flat roof tiles 10 is set to the same height position. Therefore, the sum of the thickness of the front plate portion 11 and the thickness of the back plate portion 13 is adjusted to be substantially equal to the thickness of the roof tile body 12.

The distance provided between the other side end face of the tile body 12 and the drainage groove 19 (width of the inclined portion 21) is, for example, 10 to 15 mm. The slope of the inclined portion 21 is, for example, a height difference of 1 to 3 mm with respect to the width of the inclined portion 21.
The width of the drainage groove 19 is, for example, 15 to 25 mm, and the depth is, for example, 3 to 5 mm. And the height position (drop) of the bottom face in the drain outlet 19a of the drain groove 19 with respect to the lower end of the 1st ejector type drainage part 20 is 3-10 mm, for example.

Then, the effect | action of the flat tile 10 which concerns on one embodiment of this invention is demonstrated.
On the downstream side of the one end portion of the front plate portion 11, for example, on one side end portion of the latching portion 25 provided at the lower end of the tip of the second ejector-type drainage portion 23 of the flowing water channel 22b, The first notch 32 into which the upper part of the first jetty 15 of the flat roof tile 10 is inserted is formed, and the second ejector-type drainage downstream of the other end of the roof tile body 12, for example, the flow channel 22 c. A second notch 33 into which the upper part of the second jetty 16 of the lower flat roof tile 10 is fitted at the time of construction is formed at the other end of the latching part 25 provided at the lower end of the tip of the part 23. ing. In addition, a third cut-off in which the upper part of the fourth jetty 22 is fitted between the hooks 25 provided at the lower part of the tip of the second ejector-type drainage part 23 of each of the water channels 22a, 22b, 22c. Each notch 34 is formed.

For this reason, if it arrange | positions so that the latching | locking part 25 of the upper flat roof tile 10 may contact | abut to the stopper 24 of the flat roof tile 10 arrange | positioned at the lower side, the 1st, 2nd, 2nd provided in the lower flat roof tile 10 4 piers 15, 16, and 22 are fitted into the first to third cutout portions 32 to 34 formed in the latching portion 25 of the upper flat roof tile 10, and are provided on the upper flat roof tile 10. The lower end of the tip of the ejector-type drainage section 2 can be brought close to the tile surface 18 of the lower flat roof tile 10, and the horizontal position of the mating section 14 of the flat roof tile 10 adjacent in the left-right direction on the lower side. It is possible to match the horizontal position of the mating portion 14 of the flat roof tiles 10 adjacent in the left-right direction on the upper side (stripe of the flat roof tile 10).

And, on the front side of the back plate portion 13 of the flat roof tile 10, rainwater that has entered from the mating portions 14 of the first and second jetties 15 and 16 of the flat roof tile 10 adjacent in the left-right direction when the flat roof tile 10 is constructed. A drainage groove 19 for collecting and draining is provided eccentrically on the other side from the center of the back plate part 13.
For this reason, the rain water that has entered from the mating portion 14 of the flat roof tile 10 disposed on the upper side is always drained to a location that is shifted to the other side from the horizontal position of the mating portion 14 of the flat roof tile 10 disposed on the lower side. It is possible to prevent rainwater that has entered and drained into the mating portion 14 of the upper flat roof tile 10 from entering the mating portion 14 of the lower flat roof tile 10 again.

Accordingly, it is possible to surely prevent the “leakage leak from the mating portion of the flat tiles” that has been a problem when the conventional flat tiles are lined on the roof, even if the flat tiles 10 are lined. . Thereby, in the flat roof tile 10, the advantages of the flat roof tile can be utilized to improve the workability of the roof tile and the replacement workability of the roof tile, and prevent the deterioration of the disaster prevention performance even if the roof tile is replaced. Can do.

The back plate 13 is provided with an inclined portion 21 that guides rainwater that has entered from the mating portion 14 to the drainage groove 19, so that rainwater that has entered from the mating portion 14 flows into the drainage groove 19 without fail. be able to. And since the 1st ejector-type drainage part 20 which accelerates and drains the flowing rainwater is provided in the downstream part of the drainage groove 19, the drainage of the rainwater in the drainage groove 19 is promoted, and the drainage groove 19 Rainwater can be prevented from flowing back from the inside.

Further, a plurality of fourth jetty 22 is provided on the front side of the roof tile body 12. Thereby, even if the thickness of the roof tile 12 is reduced, the rigidity and strength can be maintained, and the weight of the flat roof tile 10 can be reduced.
And the water flow path 22a pinched | interposed by the 4th jetty 22, the water flow path 22b pinched by the 4th jetty 22 of one side and the 1st jetty 15 adjacent to that, the 4th jetty 22 of the other side, and the A second ejector drainage 23 is provided at each downstream end of the water flow channel 22c sandwiched between the adjacent second jetty 16. As a result, rainwater in the flowing water channels 22a, 22b, and 22c is accelerated and drained downward, and drainage of rainwater in the flowing water channels 22a, 22b, and 22c is promoted, and the flowing water channels 22a, 22b. , 22c can be prevented from flowing back from inside.

Further, a stopper 24 is provided at the center of each flow channel 22a, 22b, 22c, and a latching portion 25 that abuts against the stopper 24 is provided on the back side of the roof tile body 12 and the front plate portion 11. The displacement of the flat roof tiles 10 arranged in the vertical direction can be prevented.
Then, when scoring the flat roof tile 10, if the latching portion 25 provided on the back surface of the flat roof tile 10 is positioned below the stopper 24 provided on the roof surface 18 of the lower flat roof tile 10, The upper flat roof tile 10 can be freely moved in the vertical direction with respect to the flat roof tile 10, and the vertical position of the upper flat roof tile 10 can be easily adjusted. As a result, the flat roof tile 10 can be attached to the roof without being cut for dimension adjustment.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, although three fourth jettys are provided, it may be one or more than four.
In addition, although this Embodiment demonstrated concretely using the numerical value, this invention is not limited to the numerical value described, It can change arbitrarily according to the use condition of a flat roof tile.

10: flat roof tile, 11: front plate portion, 12: tile body, 13: back plate portion, 14: mating portion, 15: first jetty, 16: second jetty, 17: third jetty, 18: Tile surface, 18a: tile back surface, 19: drainage groove, 19a: drainage port, 20: first ejector-type drainage portion, 21: inclined portion, 22: fourth jetty, 22a, 22b, 22c: flow channel, 23 : 2nd ejector type drainage part, 24: Stopper, 25: Hook part, 26: Projection strip, 27: Insertion groove, 28: Hook part, 29, 30, 31: Insertion part, 32: 1st notch Part, 33: second notch part, 34: third notch part

Claims (7)

A flat plate tile that has a front plate portion on one side and a tile body provided with a back plate portion on the other side, and the front plate portion overlaps the back plate portion during construction,
First and second piers are provided from one upstream end to the other downstream end portion of the front plate portion and the other end portion of the roof tile main body. The second jetty abuts or closes to form a mating portion, and the back plate portion is provided with a drainage groove that guides rainwater entering from the mating portion and drains it downstream, and the drainage groove is A flat roof tile characterized by being eccentric from the center of the back plate to the other side. 2. The flat roof tile according to claim 1, wherein the back plate portion is provided with an inclined portion that guides rainwater entering from the mating portion to the drainage groove. 3. The flat roof tile according to claim 1, wherein a first ejector drainage portion that accelerates and drains flowing rainwater is provided at a downstream portion of the drainage groove. The flat roof tile according to any one of claims 1 to 3, wherein one side and the other side are provided on the downstream side of the one side end portion of the front plate portion and the downstream side of the other side end portion of the roof tile body. Flat roof tiles characterized in that first and second cutout portions are formed in the flat roof tiles, which are opened at the time of construction and into which the upper portions of the first and second jetties are inserted. . The flat roof tile according to any one of claims 1 to 4, wherein the roof main body and the upstream end of the front plate portion extend in a lateral direction and are continuous from the roof tile main body and the front plate portion. A flat roof tile provided with a third jetty for preventing backflow of rainwater. In the flat roof tile according to any one of claims 1 to 5, on the front side of the roof tile body, a plurality of fourth jetties are provided from upstream to downstream, which act as ribs and running water guides, The flat roof tile characterized by the 2nd ejector type drainage part being provided in the downstream end part of the flowing water channel pinched by the 4th jetty. 7. The flat roof tile according to claim 6, wherein a stopper is provided at the center of each of the flow channels, and a latching portion that contacts the stopper is provided on the back side of the roof tile body, so that the flat roof tiles are overlapped. A flat roof tile characterized by preventing the above.

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