JP4475905B2 - Rainwater drainage structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rainwater drainage structure having a substantially flat floor or a roof, such as a veranda floor and a roof of a flat house formed by projecting from an outer wall of a living room, and in particular, an outer wall of a floor or a roof of a living room. By forming a horizontal underline at the perimeter of the wall, the level of the underwater line is maintained at a constant level even if the overhanging dimension of the floor or roof from the outside wall changes, and the outside wall of the room and the floor or roof The present invention relates to a drainage structure for rainwater that can maintain the relationship of height positions substantially constant.

  The floor or roof that protrudes from the outer wall of the living room, such as a veranda or a flat house, is about 1/100 to 2/100, with the perimeter of the wall facing the outer wall as the last part, in order to allow rainwater and water to flow naturally. A so-called water gradient having a downward slope is formed. The water gradient of the floor of the veranda or the roof of the flat floor described above is either a waterproof base mortar or heat insulating material provided on the upper surface of the panels or slabs constituting the floor or roof, or a base material such as a base panel. In general, it is formed by inclining.

  The floor of the veranda and the roof of the flat house that protrude from the outer wall of the living room are determined based on the height of the underwater line (eave height) formed on the outer periphery of these floors and roof. A slope with a water gradient is set as an upward slope toward the wall contact with the outer wall. For this reason, the height of the wall contact part with respect to the outer wall of a floor or a roof changes according to the overhang | projection length from an outer wall. In order to realize a water gradient, it is necessary to increase the thickness of the base material in order from the eave side to the outer wall side. Therefore, as the overhanging length increases, the height of the wall contact portion with respect to the outer wall of the floor or roof living room increases, resulting in a problem that the floor and roof are heavy and uneconomical. In particular, since the height of the wall contact portion with respect to the outer wall becomes high, when the opening constituting the entrance / exit is provided in the outer wall, the height of the opening frame (opening lower frame) constituting the opening is limited. Is derived.

  For the purpose of solving the above problem, the technique of Patent Document 1 has been proposed. This technology creates a trough that slopes from the top of the water to the bottom of the water on the veranda floor and the roof of the flat house, and connects the floors that are slanted inward against both sides of the trough. In addition, both sides of the lower end of the trough are connected to a floor surface that is inclined downward toward the eaves. With this technique, even when the depth of the floor or the roof is deep, it is possible to achieve a good drainage by forming a necessary water gradient without raising the water side more than necessary.

JP 2001-049809 (Japanese Patent No. 3369516)

  It has been found that there is still a problem to be solved even with the technique of Patent Document 1. In other words, the edge of the ridge line and the trough will come into contact with the wall of the floor of the veranda or the outer wall of the flat room roof, and the height of the ridge line depends on the width of the floor or roof. Will change. For this reason, when it is going to form the opening for entering / exiting a floor or a roof in an outer wall, there exists a problem that the height of the lower end part of this opening will be influenced by the height of a ridgeline.

  Moreover, the drainage groove formed in the floor of a common veranda or a flat floor has a flat bottom surface, and has a rectangular cross-sectional shape. For this reason, even if a small amount of rain has flown from the floor or roof, there is a problem that a water pool can be formed over the entire bottom surface.

  In the drainage groove having a rectangular cross-sectional shape as described above, when the amount of rainwater is small, a puddle is likely to be generated on the bottom surface. Therefore, it is necessary to drain the drainage groove with a water gradient. For this reason, the level of the bottom surface changes according to the position in the longitudinal direction of the drainage groove, and the dimensions of the parts for forming the drainage groove and the rising portion at the wall differ depending on the position to be arranged. . That is, there is a problem that the parts for forming the drainage groove cannot be unified in dimension.

  The object of the present invention is to secure a proper water gradient regardless of the plane dimensions of the floor of the veranda and the roof of the flat house that protrudes from the outer wall of the living room, and the lower end of the accessible opening formed on the outer wall. An object of the present invention is to provide a rainwater drainage structure that can maintain a substantially constant height from the floor surface or roof surface.

  In order to solve the above-mentioned problems, a rainwater drainage structure according to the present invention is a rainwater drainage structure in a veranda or a flat floor that protrudes from the outer wall of a living room, and forms a floor of a veranda or a flat roof. A rising portion that forms a horizontal first horizontal line along the side wall of the living room and a first drainage groove along the first horizontal line and surrounds the floor of the veranda or the roof of the flathouse A horizontal second drain line is formed along with the second drainage groove along the second underwater line, and a communication drainage groove is provided that communicates the pair of drainage grooves. The grooves are formed at the same level, and the floor or the roof has a slope having a water gradient toward at least the first drainage groove, a slope having a water gradient toward the second drainage groove, and a communication drainage groove. Divided into a slope with a water gradient towards Than is.

  In the rainwater drainage structure, it is preferable that the bottom surface of any drainage groove has no longitudinal gradient.

  In any of the above-described rainwater drainage structures, it is preferable that the bottom surface of each drainage groove has a larger gradient than the water gradient of the slope continuous with the drainage groove.

  In the rainwater drainage structure of the present invention, since a horizontal underwater line is formed in the perimeter of the floor of the veranda or the roof of the flat house that protrudes from the outer wall of the living room and the outer wall, regardless of changes in the dimensions of the floor and roof. Lines around the floor and roof walls against the outer wall can be set to a certain horizontal line. For this reason, the relative position of the height between the underwater line and the outer wall can be made constant by setting the underwater line of the floor or roof with respect to the outer wall as the reference level of drainage. For this reason, regardless of the position of the underwater line, it is possible to unify the parts that form the lower part of the water, and to reduce management in manufacturing and management in construction.

  When an opening serving as an entrance to a floor or a roof is formed on the outer wall, the height position of the opening on the outer wall surface is defined by the height of the underwater line. Therefore, by setting the height of the underwater line as a reference height of the floor or roof, the height position of the opening can be set regardless of the overhang length of the floor or roof or the length in the width direction. It can be held substantially constant. In other words, the level (height, water level) when installing the lower opening frame on the beam is fixed regardless of the overhanging length of the floor or roof, and the ceiling height of the lower floor or the floor height of the living room is maintained as before. It is not necessary to make an unreasonable design such as raising the height or lowering the floor of the veranda (lowering the beam on the lower floor), and therefore, it is not necessary to change the structure on the housing side.

  Further, by making the position in the height direction of the lower end portion of the opening formed in the outer wall of the living room substantially constant, it is possible to make the dimensions of the members attached to form the opening in the housing corresponding to the outer wall common. . Therefore, regardless of the size of the floor of the veranda or the roof of the flat house, the dimensions and structure of the members necessary for forming the opening (for example, the opening panel that becomes the installation member of the opening frame), and the underwater line It is possible to make common parts (for example, floor materials and rising members) constituting the part.

  In addition, drainage grooves provided along the underwater line formed in the wall contact portion with respect to the outer wall of the floor of the veranda floor or the roof of the flat house, and the drainage provided along the underwater line formed in a portion other than the wall contact portion By connecting the grooves with the communication drainage grooves, the underwater lines formed on the floor or the roof are continuous, so that it is possible to drain rainwater or water spray that has fallen on the floor or roof.

  In particular, it is possible to drain rainwater evenly by using technology (drainage in the building) that makes it possible to set the water drop position of the drainage channel to a desired position. For example, smooth drainage even during heavy rain Can be realized. Therefore, it is possible to realize drainage that drains from the entire floor surface or roof surface or from the entire circumference simultaneously and uniformly.

  Further, since the bottom surface of the drainage groove has a gradient in the cross section, the cross-sectional shape of the drainage groove is a substantially triangular shape with the bottom surface being a hypotenuse. For this reason, the rainwater that has flowed into the drainage groove gathers at the apex of the triangle, which is a low part, along the gradient of the bottom surface, making it difficult to collect the water as a wide surface, and to drain the water by minimizing the portion where the water accumulates.

  Moreover, by not providing a gradient in the longitudinal direction on the bottom surface of the drainage groove, the cross-sectional shape of the drainage groove is the same in the longitudinal direction. For this reason, the parts or members of the portion constituting the drainage groove (for example, the member for constructing the drainage groove or the rising member from the drainage groove, etc.) are the same, making the production easy, and the drainage groove with a simple construction. Can be formed. In particular, the height of the rising portion near the wall of the drainage groove becomes constant, and the waterproof steel sheet used for the waterproof sheet construction can be made into a single shape and size.

  For example, when the drainage channel is a floor of a veranda, a grating is disposed in the open part of the upper part of the drainage channel to ensure walking safety, but the bottom surface of the drainage channel does not have a gradient in the longitudinal direction. Therefore, the grating can be supported from the bottom surface. In other words, when the legs are provided at predetermined intervals in the grating, it becomes possible to make the height of the legs constant in the longitudinal direction, and even if the rigidity and strength of the material forming the grating are kept low, the load applied to the upper part can be reduced. It is possible to withstand it sufficiently. For this reason, it is possible to mold the grating with a synthetic resin, and in this case, on-site processing becomes easy. Usually, the grating is formed in a plate shape and is supported by a jaw-shaped recess formed in the upper part of the drainage groove. Therefore, it is necessary to increase the rigidity and strength of the surface, and use a metal such as stainless steel. However, by using a synthetic resin, the weight can be reduced and the workability can be improved.

  Hereinafter, the rainwater drainage structure of the present invention will be described. The rainwater drainage structure of the present invention relates to a rainwater drainage structure of a substantially flat floor or roof (hereinafter referred to as “floor”) such as a veranda floor and a roof of a flat house protruding from the outer wall of a living room. By forming a horizontal underwater line at the wall contact portion with respect to the outer wall, the line of the floor wall contact portion with respect to the outer wall is made a constant horizontal line regardless of changes in the depth dimension of the floor.

  By forming the underwater line (first underwater line) at the wall contact portion with respect to the outer wall of the floor, the water gradient becomes an upward gradient from the outer wall portion toward the center of the floor. In addition, the reference level of the water gradient of the floor can be set at the wall contact portion with respect to the outer wall of the floor. When the dimensions of the floor change, the height of the floor apex changes, but the underwater level does not change.

  For this reason, when an opening including an entrance for entering and exiting a floor or a roof is formed on the outer wall, the level of the lower end portion of the opening can be kept constant, and parts can be shared and straddling the opening. It is possible to realize a preferable opening with a constant height.

  In the present invention, the underwater line means a line at the most downstream part of the slope having the water gradient of the floor, and it is possible to form a drainage groove (first drainage groove) continuously with the underwater line. is there. That is, a drainage groove is provided along the underwater line. A general underwater line is not necessarily continuous with the drainage groove, and a drainage member such as a rain gutter may be provided along the underwater line.

  In the present invention, the drained water is not limited to rainwater. In the case where an artificial green area for rooftop greening is constructed on the floor, the water that is sprayed on the artificial green area is also included. It is a waste.

  Further, the living room of the present invention does not necessarily have to be a room in which a person lives, and includes a part such as a penthouse on the rooftop. Accordingly, the floor contact portion of the floor with respect to the outer wall is not formed only on one side, but is formed on two sides or more sides. For example, when a penthouse is set as a living room, wall contact portions are formed on the outer walls of the four sides around the penthouse.

  There is no particular limitation on the drainage structure of the drainage groove provided along the underwater line formed on the wall contact portion with respect to the outer wall, and along the vertical shaft connected to the drainage groove or other underwater line. The drainage can be performed by a communication drainage groove that communicates with the drainage groove provided, or by a drainage pipe piped indoors.

  For example, in the case of a drain pipe piped indoors, one end of this drain pipe is connected to the drain groove and piped to the indoor side of the floor, and further piped along a predetermined path from the ceiling portion, From the first floor of the building, it is connected to a conduit buried in the outer periphery. As described above, it is preferable to use a drain pipe piped indoors in the building so that the drain pipe cannot be seen from the outside, so that the appearance of the building can be refreshed. Further, it is preferable to provide a drain pipe at the wall contact portion because drainage is performed more smoothly.

  In addition, a water line (second water line) is formed on each side of the outer periphery of the floor, and drainage grooves are provided along these water lines. The level of these underwater lines is set to be equal to or lower than the level of the underwater line formed at the wall contact portion with respect to the outer wall, and drainage grooves (second drainage grooves) are provided along these underwater lines. It is also possible to connect the drainage channel via a drainage channel and a communication drainage channel along the underwater line provided in the wall contact portion with respect to the outer wall of the floor room.

  In this case, the communication drainage groove may be formed so as to be exposed on the floor surface, or may be formed in the lower part of the floor. When the communication drainage groove is formed in the lower part of the floor, it is preferable that the communication drainage groove is not visually recognized from the outside.

  The drainage groove has a slope whose bottom surface is larger than the floor surface or the roof surface in the cross section. For this reason, the cross-sectional shape of the drainage groove is a triangle having the deepest portion as a vertex. For this reason, rainwater flows into the deepest part, and the water level in the drainage groove increases or decreases according to the amount of rainwater. In particular, since the cross-sectional shape of the drainage groove is a triangle, the water level rapidly rises when the amount of rainwater flowing into the drainage groove is small, and the water level rises more gradually as the amount of rainwater increases. Therefore, reliable drainage can be realized even when the amount of rainwater is small.

  The slope angle of the bottom surface of the drainage groove is not particularly limited, and preferably has an angle larger than the slope angle of the floor and an angle at which water flowing into the drainage groove is smoothly accumulated at the deepest vertex. In the experiments by the present inventors, the slope of the bottom surface of the drainage groove is preferably greater than 1/10. That is, the bottom surface of the drainage groove does not have a wide flat surface. When rainwater that has fallen on the roof flows into the drainage groove, the rainwater flows into the deepest part of the drainage groove and raises the water level. For this reason, the flow path in the drainage groove is always formed on the basis of the deepest part, and reliable drainage can be realized.

  The bottom surface of the drainage groove is preferably formed at the same level without having a gradient in the longitudinal direction of the drainage groove. Moreover, it is preferable that the underwater lines and the drainage grooves are at the same level. In the present invention, it is possible to unify various parts by making the level of the plurality of underwater lines and drainage grooves the same as described above, and it is possible to ensure reliable drainage without forming a water pool in the drainage grooves. Can be realized.

  For this reason, the drainage in the drainage channel flows down due to the rise of the water level, not the natural flow.

  Rainwater that has flowed into the drainage channel is drained from the drainage channel via a drainage pipe disposed at a water dropping position. The position of the drainage pipe in the drainage groove is not particularly limited, but the rainwater flowing into the individual drainage pipes can be placed in a position where the rainwater that has flowed into the drainage groove can be drained smoothly. It is preferable to set the intervals so that the amounts are substantially equal. The installation interval of the drain pipe is not limited and is preferably set based on the drainage capacity according to conditions such as the diameter of the drain pipe. In this way, by installing a plurality of drain pipes that distribute the drain capacity substantially evenly to the drain grooves, it becomes possible to achieve substantially simultaneous drainage, which is preferable even in the case of heavy rain. It becomes possible to realize drainage.

  Further, the shape of the drain pipe is not particularly limited, and a drain pipe or a vertical gutter provided indoors is used. In particular, when a drain pipe provided indoors is used, the installation position of the drain pipe in the drain groove is not limited, and it is preferable because the interval and the number of installation can be set to a desired number.

  When connecting a drainage pipe to the drainage groove, it is preferable that water can be taken from the entire slope surface of the bottom surface in the cross section of the drainage groove. Thus, by forming the water intake port on the entire slope surface of the drainage groove, it becomes possible to drain the rainwater flowing into the drainage groove smoothly and in a short time. The intake pipe that opens to the intake port of the drain pipe may be horizontal and may have a downward slope toward the drain pipe side. In particular, when the intake pipe has a downward slope, it is possible to achieve smooth drainage by sucking rainwater flowing into the drainage groove.

  Hereinafter, preferred embodiments of the rainwater drainage structure according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining an example of a floor protruding from the outer wall of a living room. FIG. 2 is a schematic diagram illustrating the water gradient by enlarging the floor of FIG. FIG. 3 is a cross-sectional view taken along the arrow in FIG. FIG. 4 is a diagram illustrating a configuration when drainage is performed by connecting drainage grooves to drainage pipes provided inside the building.

  In FIG. 1 and FIG. 2, the floor 1 is configured so as to surround the penthouse that becomes the living room 2, and the planar shape has a rectangular outer shape defined by a parapet 3 formed along the outer periphery of the floor 2, for example. It is formed in a square ring shape having a square inner shape defined by the living room 2 inside.

  A horizontal underwater line (first underwater line) 5 is formed at a wall contact portion of the living room 2 of the floor 1 with respect to the outer wall 4, and a drainage groove (first drainage groove) 6 is provided along the underwater line 5. Yes. In addition, a water line (second water line) 7 is formed at the outer periphery of the floor 1 at the rise of the parapet 3, and a drainage groove (second drainage groove) 8 is provided along the water line 7. Accordingly, the drainage groove 6 along the underwater line 5 is formed at the wall contact portion of the floor 1 with the outer wall 4 of the living room 2, and the drainage groove 8 along the underwater line 7 is formed at the rising part of the parapet 3. Yes.

  The level relationship between the underwater line 5 and the underwater line 7 is not particularly limited. For example, when the drainage groove 6 provided along the underwater line 5 and the drainage groove 8 provided along the underwater line 7 are configured so as to be able to drain independently, what is the level relationship between them? There will be no special problems.

  However, when the drainage groove 6 and the drainage groove 8 are communicated by the communication drainage groove 9, the levels of the underwater line 5 and the underwater line 7 are the same, so the drainage grooves 6, 6 provided along these underwater lines 5, 7. The 8th level is the same.

  As described above, the floor 1 has the underwater line 5 and the drainage groove 6 formed around the living room 2, and the underwater line 7 and the drainage groove 8 are formed along the parapet 3. For this reason, the floor 1 is set at the lowest level around the living room 2 and around the parapet 3, and the slopes 10 a to 10 a having a water gradient of an ascending slope starting from the underwater lines 5 and 7 formed at these positions. 10j is formed, and ridgelines 11a to 11f are formed at the intersections of these slopes 10a to 10j. Further, mountain lines 12a to 12g and valley lines 13a to 13c are formed from the intersections of the ridgelines 11a to 11f.

  Thus, no ridgelines 11a to 11f abut against the outer wall 4 of the living room 2, and the abutting portions of the inclined surfaces 10a to 10d with respect to the outer wall 4 are horizontal lines due to the facing of the underwater line 5.

  The difference in height between the underwater lines 5 and 7 and the ridge lines 11a to 11f is the size of a half of the distance between the parallel underwater lines 5 and 7 on the floor 1 and the water gradient (1/100 or 2 / 100). For example, when the distance between the underwater lines 5 and 7 is 360 cm and the water gradient is 1/100, the height of the ridge line is 18 mm.

  The height of the floor 1 is half of the height of the ridgeline in the conventional roof. For example, a waterproof ground mortar constituting the slopes 10a to 10j of the floor 1 by the height of the ridgeline being lowered. The weight of 23 can be reduced, which is preferable.

  A drainage groove 6 provided along the underwater line 5 and a drainage groove 8 provided along the underwater line 7 communicate with each other by a communication drainage groove 9, and a drainage pipe 15 connected to a predetermined position of these drainage grooves 6, 8. From the outside of the building. The drain pipe 15 may be a so-called downpipe, and may be a drain pipe piped indoors.

  In this embodiment, for example, as shown in FIG. 4, a floor 1 is provided with a water intake pipe 15a that opens to a bottom surface 8a of a drainage groove 8 provided along the underwater line 7 of the slope 10h of the floor 1, and the water intake pipe A drain pipe 15 comprising an elbow 15b and a hose 15c connected to 15a is used. In this drain pipe 15, since the hose 15c has a relatively small diameter and flexibility, the hose 15c is piped in a space behind the ceiling formed on the indoor side of the floor 1 or in a space formed inside the outer wall of the building. It is possible to lead to the outside from a predetermined part including the floor under the first floor and drain it by being connected to a sewer pipe buried around the building. In addition, it is possible to implement | achieve smooth drainage by giving downhill to the intake pipe 15a.

  In this embodiment, the floor 1 is made of a lightweight cellular concrete (ALC) panel, precast concrete (PC) panel or the like placed on a beam 21 constituting a building frame as shown in each sectional view of FIG. A waterproof base mortar 23 is placed on the top surface of the floor panel 22, a heat insulating material 24 is applied on the top surface of the waterproof base mortar 23, and a prevention sheet 25 is applied on the top surface.

  However, the configuration of the floor 1 is not limited to the above-described embodiment, and may be a structure in which the uppermost layer is a waterproof layer made of asphalt.

  As shown in FIG. 3 (a), the drainage groove 6 provided along the underwater line 5 formed at the wall contact portion with the outer wall 4 of the living room 2 has a cross-section of the bottom surface 6a continuous with the slope 10a of the floor 1. The surface 6 b on the outer wall 4 side of the living room 2 is formed substantially vertically along the rising of the outer wall 4. For this reason, the crossing part of the bottom face 6a and the face 6b is formed as the deepest part (the deepest part 6c) of the drainage groove 6 as a vertex of a triangle.

  Further, the drainage groove 8 provided along the underwater line 7 formed at the contact portion with the parapet 3 is also a bottom surface 8a continuous with the inclined surface 10h of the floor 1 like the drainage groove 6 as shown in FIG. Is formed with a gradient in the cross section, and the surface 8b on the side of the parapet 3 is formed substantially vertically along the rising edge of the parapet 3. For this reason, the crossing part of the bottom face 8a and the face 8b is formed as the deepest part 8c of the drainage groove 8 as a triangular apex.

  Furthermore, as shown in FIG. 2B, the communication groove 9 that communicates the drainage groove 6 and the drainage groove 8 has bottom surfaces 9a and 9a that are continuous with the slopes 10a and 10i of the floor 1, respectively, having a gradient in the cross section. The portion where these bottom surfaces 9 a intersect is the apex of the triangle, and is formed as the deepest portion 9 b of the drainage groove 9.

  Further, as shown in FIGS. 3A and 3B, a grating 27 is provided over the entire length of the drainage groove 6 at the portion facing the entrance 30 from the living room 2 or the communication drainage groove 9. Therefore, the person who goes out to the roof 1 is configured not to trip the drainage grooves 6 and 9. However, it is natural that the grating 27 is not always necessary in the present invention.

  In the drain grooves 6, 8 and 9 (typically drain grooves 6) configured as described above, rainwater flowing along the water gradient of the slope 10 a constituting the floor 1 flows into the deepest part 6 c from the bottom surface 6 a, and the precipitation. Depending on the amount, the water level becomes high starting from the deepest part 6c. That is, when rainwater that has fallen on the floor 1 flows into the drainage groove 6, it first accumulates in the deepest part 6c having the smallest cross-sectional area, and the water level rises from this part, so that the cross-sectional area of the part where water accumulates is minimized. As a limit value, it becomes possible to achieve positive drainage.

  In particular, the drain grooves 6 and 8 are configured to have a horizontal level without having a water gradient in the longitudinal direction. That is, even if a water gradient is not provided in the drain grooves 6 and 8, the water flowing into the drain grooves 6 and 8 is first accumulated in the deepest portions 6c and 8c and the water level rises. As the water level rises, the water flows into the intake pipe 15a of the drain pipe 15 connected to a predetermined position of the drain grooves 6 and 8, and is drained through the hose 15c.

  Since the drain grooves 6 and 8 do not have a gradient in the longitudinal direction, the levels of the deepest portions 6c and 8c do not change at any position. That is, the rising height of the drainage groove 6 with respect to the outer wall 4 of the living room 2 is constant, and the shape and dimensions of the rising metal fitting 28 used when the drainage groove 6 is configured are made constant. It can be used at any position. Even in the drainage groove 8, similarly to the drainage groove 6, the rising height with respect to the parapet 3 is constant, and the shape and dimensions of the rising metal fitting 29 constituting the drainage groove 8 can be configured to be constant. .

  Therefore, it is possible to reduce the number of parts when the drain grooves 6 and 8 are configured, and the labor required for manufacturing the rising brackets 28 and 29 and managing the parts is reduced, and the drain grooves 6 and 8 are configured. It becomes possible to improve the workability when performing.

  The living room 2 is provided with an entrance 30 for entering and exiting the roof 1. As shown in FIG. 3A, the doorway 30 is installed by using an opening frame 31 attached to the beam 21 constituting the building frame.

  The height of the entrance / exit 30 from the beam 21 is set on the basis of the level of the wall contact portion with respect to the outer wall 4 of the living room 2 of the floor 1. In the present embodiment, the level of the wall contact portion is the level of the underwater line 5, and the underwater line 5 serves as a reference for the water gradient of the roof 1, so the dimension of the underwater line 5 from the frame (beam 21). Is held at a constant value. Therefore, the height from the beam 21 of the entrance / exit 30 in the outer wall 4 is constant regardless of the change in the dimension of the floor 1.

  As described above, the entrance / exit 30 formed in the living room 2 has a constant dimension from the upper surface of the beam 21 regardless of the dimension of the floor 1, and can use the same opening frame 31. That is, when the entrance 30 to the roof 1 is provided in the living room 2, it can be installed without increasing the number of parts regardless of the size of the roof 1.

  INDUSTRIAL APPLICABILITY The present invention is effective in standardizing parts used for forming a drainage groove when constructing a floor of a veranda or a roof of a flat house provided to protrude from an outer wall of a living room, and is provided with a floor or a roof on the outer wall. When providing an entrance to and from the entrance, the height of the entrance and exit from the beam is made substantially constant, so that the parts constituting the entrance and exit are unified and the height of the lower end of the entrance and exit is made constant from the floor of the living room. Therefore, it is advantageous to apply to a detached house and a medium- and high-rise house.

It is a figure explaining the example of the floor projected from the outer wall of a living room. It is a schematic diagram which expands the floor of FIG. 1 and demonstrates a water gradient. It is sectional drawing of the part of the arrow of FIG. It is a figure explaining the structure at the time of draining by connecting a drain ditch to the drain pipe provided in the inside of a building.

DESCRIPTION OF SYMBOLS 1 Floor 2 Living room 3 Parapet 4 Outer wall 5,7 Underwater line 6,8 Drainage groove 6a, 8a, 9a Bottom surface 6b, 8b Surface 6c, 8c, 9b Deepest part 9 Communication drainage groove 10a-10j Slope 11a-11f Ridge line 12a-12g Mountain line 13a-13c Valley line 15 Drain pipe 15a Intake pipe 15b Elbow 15c Hose 21 Beam 22 Floor panel 23 Waterproof base mortar 24 Heat insulating material 25 Prevention sheet 27 Grating 28, 29 Standing fitting 30 Entrance 31 Open frame

Claims (3)

It is a rainwater drainage structure in a veranda or flat underhanging from the outer wall of the room,
Forming a horizontal first horizontal line along the side wall of the floor forming the floor of the veranda or the floor of the flat house, and providing a first drainage groove along the first horizontal line, Forming a horizontal second underwater line along the rising portion surrounding the floor of the veranda or the roof of the flat house, and providing a second drainage groove along the second underwater line,
In addition, a communication drainage groove that communicates the pair of drainage grooves is provided,
Each of these drainage grooves is formed at the same level, and the floor or roof has a slope having a water gradient toward at least the first drainage groove, and a slope having a water gradient toward the second drainage groove, A rainwater drainage structure characterized by being divided into a slope having a water gradient toward the communication drainage groove. The rainwater drainage structure according to claim 1, wherein the bottom surface of any drainage groove does not have a gradient in the longitudinal direction. The rainwater drainage structure according to claim 1 or 2 , wherein the bottom surface of each drainage groove has a gradient larger than the water gradient of the slope continuous with the drainage groove.

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