JP2001032464A - Sheet waterproof structure of eaves side edge with drainage slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof sheet structure of the periphery of a recessed corner capable of obtaining excellent drain performance and capable of preventing the formation of a pool. SOLUTION: A recessed step part 40 is formed on the edge of the eaves side 10. An L-shaped fixing member 30 composed of a vinyl chloride steel plate is arranged so as to run the vertical flange 32 along a wall surface of a rising wall 20, and a horizontal flange 31 is fixed to building frames 11, 21 in a state of being arranged in the recessed step part 40. A waterproof sheet 50 is arranged over the wall surface of the rising wall 20 from an upper surface of the eaves side 10, and a prescribed position of the waterproof sheet 50 is integrally joined to the flanges 31, 32 of the fixing member 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet structure at the edge of a flat field with a water gradient, which is suitably used, for example, around a flat field on a rooftop or a veranda and around the corner between rising walls.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8 (a), when a waterproof sheet (5) is laid on a building roof by an insulation method, a flat field (1) and a rising wall (2) of a parapet or the like are required. At the corners between the corners, a corner fixing member (6) made of a resin-coated steel sheet having an L-shaped cross section is fixed along the corners. A waterproof sheet (5) is disposed so as to cover the upper surface of the flat field (1) and the wall surface of the rising wall (2), and the corners of the waterproof sheet (5) are formed on the resin surface layer of the fixing member (6). Joined.

[0003] In such a sheet waterproof structure at the corner, a water gradient is provided in the flat field (1) so that the upper surface thereof becomes lower as it goes toward the rising wall (2). It is general that the slope is used to guide rainwater, sprinkled water, etc., which has fallen on the roof, to the inside corner and from there to a predetermined drain.

[0004]

However, in the above-mentioned conventional waterproof sheet at the corner, the horizontal flange of the fixing member (6) for fixing the waterproof sheet is provided on the upper surface of the edge on the corner in the flat field (1). Since (6a) is arranged, the flange surface is arranged at a position higher than the upper surface of the flat field (1) by the thickness of the horizontal flange (6a). For this reason, in the waterproof sheet (5) arranged from the upper surface of the flat field (1) to the upper surface of the horizontal flange (6a), a step is formed between the horizontal flange (6a) and the flat field (1) such that the entry corner is higher. (S) is formed, and due to the step (S), the rainwater (W) flowing on the flat field (1) is dammed and a water pool is formed. When a puddle is formed in this way,
As shown in FIG. 8 (b), when walking on the flat block (7) spread on the flat field (1), it is difficult to walk on the flat field (1). W) jumps up and hits a pedestrian, causing a problem such as giving discomfort.

[0005] Even after the water in the puddle is drained, mud and dust mixed in the rainwater (W) remain and adhere to the upper surface of the flat field,
There is a problem that the aesthetic appearance is reduced and the performance of the waterproof sheet (5) is also reduced.

[0006] The present invention solves the above-mentioned problems of the prior art, and provides a sheet waterproof structure at the edge of a flat field with a water gradient which can obtain good drainage performance and prevent formation of a puddle. The purpose is to provide.

[0007]

In order to achieve the above object, according to the present invention, a plate-like sheet joining piece is fixed along one edge on the upper surface side of a flat field having a water gradient inclined toward one edge. A required portion of the waterproof sheet disposed so as to cover the upper surface of the flat field is a sheet waterproof structure of a flat field edge with a water gradient that is joined to the sheet joining piece, and the flat sheet upper surface side At one end edge, a concave step having a depth of at least the thickness of the sheet joining piece is formed, and the sheet joining piece is arranged at the concave step,
The gist is that the upper surface of the sheet joining piece is arranged at the same height or lower position with respect to the upper surface of the flat field.

[0008] In the sheet waterproofing structure of the flat field edge with the water gradient of the present invention, no step is formed between the sheet bonding piece and the flat field so that the side of the sheet bonding piece becomes higher, so that the sheet flows along the flat field along the gradient. Rainwater is smoothly guided to one edge side. For this reason, good drainage properties can be obtained,
The formation of a puddle can be prevented.

On the other hand, the present invention is suitable for a structure having a corner having a rising wall provided along the edge of a flat field, or a structure in which a water collecting groove is formed between the edge of the flat field and the rising wall. Can be adopted.

That is, in the present invention, a rising wall is provided along one edge of the flat field, a horizontal flange of a fixing member having a horizontal flange and a vertical flange is formed as the sheet joining piece, and It is preferable to adopt a configuration in which the horizontal flange is arranged in the concave step portion while the vertical flange is arranged along the wall surface of the rising wall.

Further, according to the present invention, a rising wall is provided along one edge of the flat field, a water collecting groove is formed between the rising wall and one edge of the flat field, and an inner periphery of the water collecting groove is formed. A horizontal flange of a fixing member having a groove-shaped body that can follow the surface, a horizontal flange connected to one side wall of the groove-shaped body, and a vertical flange connected to the other side wall of the groove-shaped body. The horizontal flange is formed as the sheet joining piece, the groove-shaped main body of the fixing member is housed in the water collecting groove, and the vertical flange is arranged along the wall surface of the rising wall. It is preferable to adopt a configuration arranged in the concave step.

In the present invention, it is preferable to adopt a configuration in which a part of the skeleton in the flat field is excavated to form the concave step. That is, when this configuration is adopted, the concave step can be easily formed only by excavating the skeleton.

Further, in the present invention, the flat field has a base material laminated on an upper surface of the frame, and a part of the base material is formed thin or a part of the base material is removed. It is even more preferable to adopt a configuration in which the concave step is formed. That is, when this configuration is adopted, the concave step can be easily formed only by processing the base material.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> FIGS. 1 and 2
FIG. 1 is a cross-sectional view showing a waterproof sheet structure around an inward corner of a building roof or the like according to a first embodiment of the present invention. As shown in both figures, the vicinity of the corner to which this structure is applied is provided with a flat field (10) composed of a concrete frame (11) and an upright shape along the edge of the flat field (10). A rising wall (20) of a parapet or the like composed of a frame (21). Hiraba (10)
The upper surface has a water gradient that becomes lower toward the rising wall (20) side, that is, a water gradient that is inclined toward one edge.

The corner fixing member (30) employed in the structure of the present embodiment is a PVC steel sheet or the like in which a synthetic resin such as vinyl chloride resin is laminated on both front and back surfaces of a metal sheet core layer such as a steel sheet. Of a resin-coated metal plate. The fixing member (30) has an L-shaped cross section and has a horizontal flange (31) and a vertical flange (32).

When forming the waterproof sheet structure of the present embodiment, first, as shown in FIG. 2, one edge on the upper surface side of the flat field (10) is excavated to form a concave step (40). .

Next, the horizontal fixing flange (31) is arranged in the concave step (40) with the vertical flange (32) of the fixing member for corner entry (30) along the lower edge wall surface of the rising wall (20). In this state, the flanges (31) and (32) of the fixing member (30) are fixed to the flat field (10) and the rising wall (2) by using fixing tools (60) and (60) such as tapping screws and open nails.
0) is fixed to the skeletons (11) and (21).

In this embodiment, when the depth of the concave step (40) is "D" and the thickness of the horizontal flange (31) of the fixing member (30) is "T", T = D Is established. For this reason, the horizontal flange (31)
And the upper surface of the flat field (10) are formed in a continuous plane having no step.

In the present invention, at least T ≦ D
By establishing the relational expression, the horizontal flange (3
The upper surface of 1) needs to be formed at the same height or lower than the upper surface of the flat field (10). In other words, when this relational expression is not established, a step is formed between the upper surface of the horizontal flange (31) and the upper surface of the flat field (10) such that the horizontal flange (31) side is higher. The flow may be hindered and the drainage performance may be reduced.

After the fixing member (30) is fixed, as shown in FIG. 1, the waterproof sheet (50) is arranged so as to cover the area from the upper surface of the flat field (1) to the wall surface of the rising wall (2). Then, the corresponding corner of the waterproof sheet (50) is joined to the surface resin layer of the horizontal flange (31) and the vertical flange (31) of the corner fixing member (30) by heat welding or solvent welding. Integrated and fixed. Thus, the sheet waterproof structure of the present embodiment is formed.

Here, as the waterproof sheet (50), a sheet made of a thermoplastic synthetic resin such as a soft polyvinyl chloride resin, a polyethylene resin and a polypropylene resin can be suitably used.

Needless to say, in the present invention, the waterproof sheet (50) is divided into two or more at the position of the corner fixing member (30) in consideration of workability and the like, and the divided edge is divided. May be superposed and laid.

In the present invention, the waterproof sheet (50)
A cross sheet may be laid as needed between the space and (1).

In the seat waterproofing structure of the present embodiment,
A concave step (40) is formed at the edge of the flat corner (10) on the inner corner side, and a horizontal flange (31) of a fixing member (30) for fixing a waterproof sheet is formed in the concave step (40). ), No step is formed between the upper surface of the horizontal flange (31) and the upper surface of the flat field (10), and the sheet is laid from the center of the flat field (10) to the rising wall (20). The area is formed in a smooth plane with a moderate water gradient. For this reason, the rainwater or the like that has poured into the flat field (10) is smoothly guided to the rising wall (20) side, that is, to the corner, and from there to a predetermined drain port. Therefore, no puddles are formed on the flat field (10). For example, when a flat block is spread over the flat field (10), rainwater does not jump up even if walking on the block. , Walking can be performed without any trouble.

In the seat waterproofing structure according to the present embodiment, since water is smoothly drained without forming a water pool,
Mud and dust mixed into the rainwater are surely discharged from a predetermined drain port together with the rainwater. Therefore, the mud and dust do not remain on and adhere to the flat field, a good appearance can be obtained, and the performance of the waterproof sheet (50) can be maintained at a high level. Further, the upper surface of the horizontal flange (31) and the flat field (1)
0), there is no step between it and the waterproof sheet (5).
Since the streaks due to the steps are not formed on the surface of 0) and are formed flat, the aesthetic appearance can be further improved.

<Second Embodiment> FIG. 3 (a) is a cross-sectional view showing a seat waterproof structure at an inside corner according to a second embodiment of the present invention. As shown in the figure, in this embodiment, the flat field (10) is composed of a concrete body (11),
It comprises a heat insulating panel (12) as a base material laminated on the frame (11). Here, as the heat insulating panel (12), for example, a panel made of a resin foam such as polystyrene, polyvinyl chloride, polyurethane, or polyethylene can be suitably used.

In this embodiment, the heat insulating panel (12) is provided at the edge of the flat field (10) on the rising wall (20) side.
Is cut off to form a concave step (40), and the horizontal flange (31) of the fixing member (30) for the corner is arranged in the concave step (40). Other configurations are the same as above.

In this embodiment, the same effect as described above can be obtained. Further, in the present embodiment, the concave step (40) is formed by cutting the heat insulating panel (12), which is easier to process than the concrete frame (11), so that the concave step (40) can be simplified. And can be more easily constructed.

<Third and Fourth Embodiments> As shown in FIG. 3 (b), in the third embodiment of the present invention, the flat field (10) includes a concrete body (11) and a concrete body (11). 11) A heat insulating panel (12) as a base material stacked on the heat insulating panel (12) and a non-combustible panel (13) as a base material stacked on the heat insulating panel (12). At one end of the flat field (10), a concave step (40) is formed by removing a part of the non-combustible panel (13), in other words, by not stacking the non-combustible panel (13) on the flat field edge. The horizontal flange (31) of the corner fixing member (30) is arranged in the concave step (40). In addition, what consists of a calcium silicate board etc. can be used suitably as a noncombustible panel (13).

In this embodiment, the fixing member (3
When the thickness of 0) is “T” and the thickness of the non-combustible panel is “Tp”, the relational expression of T ≦ Tp is established. Other configurations are the same as above.

In this embodiment, the same effect as described above can be obtained, and furthermore, since the recessed step (40) is formed without laminating the non-combustible panel (13), the recessed step is formed. Since no special processing is required, the work can be performed even more easily.

As shown in FIG. 3C, in the fourth embodiment of the present invention, in a flat field (10), two non-combustible panels (13a) and (13b) are provided on the heat insulating panel (13).
Two non-combustible panel layers are formed by laminating the layers. At the edge of the flat field, the upper non-combustible panel (13
By removing a part of b), in other words, by not laminating the upper non-combustible panel (13b) on the edge of the flat field, the concave step (40) is formed. Here, the thickness of the fixing member (30) is “T”, and the upper non-combustible panel (13
When the thickness of b) is “Tpb”, the relational expression of T ≦ Tpb is established. Other configurations are the same as above.

<Fifth Embodiment> FIG. 4A shows a fifth embodiment of the present invention. In this embodiment, a water collecting groove (25) is provided between the flat field (10) and the rising wall (20).
Are formed. The groove fixing member (130) arranged in the water collecting groove (25) is made of a resin-coated steel plate or the like as described above, and can be formed along the inner peripheral surface of the water collecting groove (25). 135) and a horizontal flange (13) connected to the upper end of one side wall of the groove-shaped main body (135) and extending in the horizontal direction.
1), the groove-shaped main body (135) is connected to the upper end of the other side wall,
A vertical flange (132) extending vertically.

In this embodiment, the flat field (1
An edge on the water collecting groove (25) side of the skeleton (11) constituting 0) is excavated to form a concave step (40).

Subsequently, the groove fixing member (130) is accommodated in the groove type body (135) in the water collecting groove (25), and the horizontal flange (131) is disposed in the concave step (40). , The vertical flange (132) is arranged along the wall surface of the rising wall (20), and in this state, the fixing member (1) is disposed.
30) by means of a fastener (not shown)
Fixed to.

Then, the edge of the waterproof sheet (50) arranged so as to cover the upper surface of the flat field (10) is fixed to the fixing member (13).
In step (0), the horizontal flange (131) is joined and fixed to the resin surface layer by heat fusion or solvent welding. In the present embodiment, the fixing member (13
A waterproof sheet may be laid on the inner peripheral surface of 0) or the wall surface of the rising wall (20). Other configurations are the same as above.

In the seat waterproofing structure at the corner in this embodiment, the upper surface of the horizontal flange (131) and the flat surface (1) are also provided.
Since no step is formed between the upper surface of the flat surface (10) and the flange (131), the flat surface (10) is not formed.
Rainwater or the like that has fallen on the top is smoothly guided to the drainage ditch (25) by the water gradient of the flat field (10) and drained.

<Sixth to Eighth Embodiments> FIG. 4B
As shown in (6), in the sixth embodiment of the present invention, a flat field (10) is composed of a concrete skeleton (11) and a heat insulating panel (12) laminated on the skeleton (11). In addition, a heat insulating panel (12) is arranged at a distance from the rising wall (20), and a water collecting groove (25) is formed therebetween. And the heat insulation panel (1
The edge of the water collecting groove (25) side of 2) is partially cut off,
A concave step (40) is formed, and the horizontal flange (131) of the groove fixing member (130) is arranged in the concave step (40). Other configurations are the same as above.

As shown in FIG. 4C, according to the seventh embodiment of the present invention, the flat field (10) is
1) On top of the insulation panel (12) and the non-combustible panel (13)
Are laminated and arranged, and the edge of the non-combustible panel (13) is removed to form a concave step (40). Other configurations are the same as above.

As shown in FIG. 4D, in the seventh embodiment of the present invention, in the flat field (10), the heat insulating panel (1) is used.
2) The non-combustible panels (13a) and (13b) are stacked on top of each other, and the edge of the upper non-combustible panel (13b) is removed to form a concave step (40). Other configurations are the same as above.

<Ninth Embodiment> FIG. 5A shows a ninth embodiment of the present invention. In this embodiment, the flat field (1
In the center of (0), a heat insulating panel (12a) having a gentle water gradient is laminated and arranged on the concrete frame (11), and the concrete frame is formed at the end of the flat field (10) on the rising wall (20) side. On the (11), a heat insulating panel (12b) with a steep water gradient is stacked and arranged. Thereby, a water collecting groove (125) having a triangular cross section is formed in a region where the heat insulating panel (12b) having a steep water gradient is arranged in the flat field (10).

In the present embodiment, the edge of the heat insulating panel (12b) is partially cut off to form the concave step (4).
0) is formed. A substantially L-shaped triangular groove fixing member (230) made of the same resin-coated steel plate as described above and having an inner angle between both flanges (231) and (232) smaller than a right angle.
However, with the horizontal flange (231) arranged in the concave step (40) and the vertical flange (232) arranged along the lower edge wall surface of the rising wall (20),
It is fixed to the skeletons (11) and (21). In addition, flat ground (10)
The waterproof sheet (50) arranged along the upper surface of the base member and the wall surface of the rising wall (20) is joined and integrated with the resin surface layer of the fixing member (230).

Other configurations are the same as those described above.

Also in this embodiment, no step is formed between the upper surface of the horizontal flange (231) and the upper surface of the flat field (10) such that the flange (231) side becomes higher. ) The rainwater that falls on
Smooth catchment channel (12)
It is guided to 5) and drained.

<Tenth to Twelfth Embodiments> FIG.
As shown in (b), in the tenth embodiment of the present invention, in a flat field (10), as a heat insulating panel (12a) on the end side having a steep slope, its height is gentle. What is lower than the height of the central heat insulating panel (12b) is used. Specifically, the heat insulation panel (12
In (a), the height of the upstream end is "Ha", the height of the downstream end of the central heat insulating panel (12b) is "Hb", and the thickness of the triangular groove fixing member (230) is "T". When (T + H
b) ≦ Ha is established so that a concave step (4) is formed on the upper surface side of the end side heat insulating panel (12a).
0). Other configurations are the same as above.

As shown in FIG. 5C, the eleventh embodiment of the present invention
In the embodiment of the present invention, in the flat field (10), one non-combustible panel (13a) is laminated on the heat insulating panel (12a) on the end side, and two non-combustible panels are laminated on the central heat insulating panel (12b). Panels (13a) and (13b) are laminated,
The non-combustible panel (13a) has a recessed step (40) in one layer. Other configurations are the same as above.

As shown in FIG. 5D, the twelfth embodiment of the present invention
In the flat field (10), the non-combustible panel (13) having a small thickness is laminated on the heat-insulating panel (12a) on the end side, and the thickness is reduced on the central heat-insulating panel (12b). The thick noncombustible panel (13c) is laminated, and a concave step (40) is formed on the upper surface side of the thin noncombustible panel (13). Here, in the present embodiment, the fixing member (2
30) "T" thickness, thin non-combustible panel (13)
When the thickness of the non-combustible panel (13c) having a large plate thickness is "Tpc", the relational expression of T≤ (Tpc-Tp) is established. Other configurations are the same as above.

In each of the above-described embodiments, the waterproof sheet structure of the present invention comprises a flat field (10) and one rising wall (2).
0), that is, the case where the present invention is applied to the corner where two surfaces intersect, but the present invention is not limited to this, and the sheet waterproofing structure of the present invention includes two rising walls arranged at right angles to each other. The present invention can also be applied to a corner between a flat ground and a corner where three sides intersect. A fixing member (330) for a catchment basin as shown in FIG. 6 can be exemplified as the fixing member arranged at the corner where the three surfaces intersect. This fixing member (330) is a main body (3
35) and horizontal flanges (331) and (33) connected to the upper ends of two adjacent side walls of the main body (335), respectively.
1) and vertical flanges (332) (332) connected to the upper ends of the remaining two side walls, respectively. In addition,
A drain hole (336) for discharging rainwater guided into the square body (335) is formed in the bottom wall of the square body (335).

In this catchment fixing member (330), the square body (335) is disposed in a concave portion formed at the corner, and each of the vertical flanges (332) (332).
Are respectively arranged along the wall surfaces of the two rising walls, and each horizontal flange (331) (331)
Are arranged in the concave steps provided at the edges of the flat field, respectively.

[0050]

As described above, according to the sheet waterproof structure of the flat field edge with a water gradient of the present invention, a concave step is formed at one edge of a flat field having a water gradient inclined toward one edge. Then, by arranging the sheet joining piece in the concave step, in a state where the upper surface of the sheet joining piece is arranged lower than the upper surface of the flat field, a waterproof sheet is arranged so as to cover the flat field and the sheet is formed into a sheet joining piece. Since it is the one to be joined, there is no step formed between the sheet joining piece and the flat field so that the side of the sheet joining piece is higher, and the rainwater flowing on the flat field is smoothly guided to one edge side, so that it is good. Drainage can be obtained, and formation of a water pool can be prevented. As a result, it is possible to prevent problems such as rainwater jumping up when walking on a flat ground, and furthermore, it is possible to obtain a good appearance without mud and dust mixed in the rainwater remaining on the flat ground, and to improve the performance of the waterproof sheet. There is an effect that it can be maintained.

Further, when the present invention is adopted in a structure having an entry corner provided with a rising wall along the edge of the flat field, rainwater or the like that has fallen on the flat field can be smoothly guided to the entry corner, There is an advantage that better drainage properties can be obtained.

Further, when the present invention is applied to a structure in which a water collecting groove is formed between the edge of the flat field and the rising wall, it is possible to smoothly guide rainwater or the like that has fallen on the flat field into the water collecting groove. There is an advantage that a good drainage property can be obtained.

Further, in the present invention, when the flat field is constituted by a skeleton such as concrete, there is an advantage that a recessed step can be formed only by excavating the skeleton and the construction can be easily performed. .

Further, according to the present invention, when the flat field is formed by laminating a base material on a frame, a concave portion is formed by forming a thin part of the base material or removing a part of the base material. There is an advantage that the step can be formed and the construction can be performed more easily.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a sheet waterproof structure at an edge of a flat field with a water gradient according to a first embodiment of the present invention.

FIG. 2 is an exploded cross-sectional view showing the waterproof sheet structure of the first embodiment.

3A is a sectional view showing a second embodiment of the present invention, FIG. 3B is a sectional view showing a third embodiment, and FIG. 3C is a sectional view showing a fourth embodiment; FIG.

4A is a sectional view showing a fifth embodiment of the present invention, FIG. 4B is a sectional view showing a sixth embodiment, and FIG. 4C is a sectional view showing a seventh embodiment; FIG.
It is sectional drawing which shows embodiment.

5A is a sectional view showing a ninth embodiment of the present invention, FIG. 5B is a sectional view showing a tenth embodiment, and FIG. 5C is a sectional view showing an eleventh embodiment; FIG. 14D is a sectional view showing the twelfth embodiment.

FIG. 6 is a perspective view showing a modification of a fixing member applicable to the seat waterproofing structure of the present invention.

FIG. 7 is a cross-sectional view showing a conventional waterproof sheet structure at an inside corner.

FIG. 8 (a) is a perspective view showing a conventional sheet waterproof structure at a corner, and FIG. 8 (b) is a perspective view showing another conventional sheet waterproof structure at a corner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Flat field 11 ... Concrete skeleton 12, 12a, 12b ... Insulated panel 13, 13a, 13b, 13c ... Non-combustible panel 20 ... Rise wall 21 ... Concrete skeleton 25 ... Water collecting groove 30 ... Fixing members for corners 31, 131, 231 ... horizontal flanges (sheet joining pieces) 32, 132, 232 ... vertical flanges 130 ... groove fixing members 135 ... grooved body 230 ... water collecting basin fixing members 40 ... concave step portions 50 ... prevention sheets

Claims (5)

[Claims] 1. A flat sheet joint piece is fixed along one edge on the upper surface side of a flat field having a water gradient inclined toward one edge, and a waterproof sheet is disposed so as to cover the upper surface of the flat field. A required portion of the sheet is a sheet waterproof structure of a flat field edge with a water gradient so as to be bonded to the sheet bonding piece, and at least one sheet edge of the sheet bonding piece at one edge of the flat field upper surface side. A concave step having a depth is formed, the sheet joining piece is arranged in the concave step, and the upper surface of the sheet joining piece is arranged at the same height or a lower position with respect to the upper surface of the flat field. A sheet waterproof structure at the edge of a flat field with a water gradient. 2. A rising wall is provided along one edge of the flat field, a horizontal flange of a fixing member having a horizontal flange and a vertical flange is formed as the sheet joining piece, and the vertical flange of the fixing member is 2. The sheet waterproof structure at the edge of a flat field with a water gradient according to claim 1, wherein the horizontal flange is arranged on the concave step portion while being arranged along the wall surface of the rising wall. 3. 3. A rising wall is provided along one edge of the flat field, and a water collecting groove is formed between the rising wall and one edge of the flat field, along an inner peripheral surface of the water collecting groove. The grooved main body to be obtained, a horizontal flange connected to one side wall of the grooved main body, and a horizontal flange of a fixed member having a vertical flange connected to the other side wall of the grooved main body, the seat has a horizontal flange. The horizontal flange is formed as a joining piece, the groove-shaped main body of the fixing member is housed in the water collecting groove, and the horizontal flange is disposed along the wall surface of the rising wall. 3. The sheet waterproof structure at the edge of a flat field with a water gradient according to claim 1 or 2, wherein the sheet waterproof structure is provided in a portion. 4. The sheet waterproof structure at the edge of a flat field with a water gradient according to claim 1, wherein a part of the frame in the flat field is excavated to form the concave step. 5. The flat field has a base material laminated on an upper surface of a frame thereof, and a part of the base material is formed thin or a part of the base material is removed, and the concave step is formed. The sheet waterproof structure of a flat field edge with a water gradient according to any one of claims 1 to 3, wherein a portion is formed.