Sheet fixing structure and sheet fixing method

Abstract

To provide a sheet fixing structure and a sheet fixing method capable of preventing, on a sheet stop material, entry of water to a lower side sheet fixing part to which a lower sheet is fixed.SOLUTION: Means for solving problems is stretched along a depth direction to skeletons F, between a top part and a ground surface in a simple structure comprising a plurality of arch-shaped skeletons F which is arranged in the depth direction to the ground surface, and the means comprises: a sheet stop material 4 comprising an upper side sheet fixing part 2 and a lower side sheet fixing part 3 which is arranged closer to the ground surface side relative to the upper side sheet fixing part 2 and has an opening A; and a lower sheet S2 which is arranged closer to the ground surface side relative to the sheet stop material 4 of the skeletons F, and is inserted into the opening A of the lower side sheet fixing part 3, and is fixed in a state in which the upper end thereof is folded back toward the ground surface side. The opening A of the lower side sheet fixing part 3 is covered with a folded part S2a of the lower sheet S2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sheet fixing structure and a sheet fixing method. [Background technology]

[0002] In simple structures such as vinyl greenhouses which have multiple arch-shaped frameworks arranged in a line in the depth direction, multiple sheet fastening materials are suspended in parallel between the top of the simple structure and the ground, running along the depth direction of the framework, and a sheet fixing structure is adopted in which the sheet is fixed to each sheet fastening material, thereby extending the sheet over the framework.

[0003] Specifically, in conventional sheet fixing structures, the sheet fastening material comprises an upper sheet fixing portion having a fixing groove whose opening width is narrower than the width of the bottom, and a lower sheet fixing portion which is positioned closer to the ground than the upper sheet fixing portion and has a fixing groove whose opening width is narrower than the width of the bottom.

[0004] The upper sheet can be fixed to the upper sheet fixing part by inserting the lower end of the upper sheet, which is stretched toward the top side of the simple structure beyond the sheet fastening material, into the fixing groove of the upper sheet fixing part and inserting an elastic member from above the upper sheet into the fixing groove of the upper sheet fixing part. Furthermore, the lower sheet can be fixed to the lower sheet fixing part by inserting the upper end of the lower sheet, which is stretched toward the ground side beyond the sheet fastening material, into the fixing groove of the lower sheet fixing part and inserting an elastic member from above the lower sheet into the fixing groove of the lower sheet fixing part (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-221141 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the sheet fixing structure of Patent Document 1, the sheet fastening material is fixed to the framework at each intersection of the framework and the lower sheet fixing portion by a joint member that holds the framework and the lower sheet fixing portion. However, joint members are generally expensive, and the work of attaching the sheet fastening material to the framework using the joint member is also troublesome. Therefore, screws are used, which are inexpensive and can easily attach the lower sheet fixing portion to the framework. Specifically, at the intersection of the lower sheet fixing portion and the framework, the screw penetrates the bottom of the lower sheet fixing portion and is screwed into the framework, thereby fixing the sheet fastening material to the framework.

[0007] However, when connecting the sheet fastening material to the frame with screws in this manner, the screws penetrate the lower sheet fixing portion, and if rainwater or other water enters and accumulates in the fixing groove of the lower sheet fixing portion, there is a risk that water will enter the greenhouse through the gap between the screws and the lower sheet fixing portion.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a sheet fixing structure and a sheet fixing method capable of preventing water from entering the lower sheet fixing portion where the lower sheet is fixed in the sheet fastening material. [Means for solving the problem]

[0009] In order to achieve the above object, the sheet fixing structure of the present invention is characterized in that it comprises a sheet fastening material that is spanned between the top of a simple structure having a plurality of arch-shaped frameworks arranged in a line in the depth direction relative to the ground and the ground, the sheet fastening material having an upper sheet fixing portion and a lower sheet fixing portion that is arranged on the ground side of the upper sheet fixing portion and has an opening, and a lower sheet that is arranged on the ground side of the framework from the sheet fastening material, inserted into the opening of the lower sheet fixing portion, and fixed in a state where the upper end is folded back toward the ground side, the opening of the lower sheet fixing portion being covered by the folded back portion of the lower sheet. With this configuration, since the opening of the lower sheet fixing portion is covered by the folded back portion of the lower sheet, it is possible to prevent water such as rainwater from entering the opening.

[0010] The sheet fixing structure of the present invention may have an upper sheet that covers the top side of the frame from the sheet fastener and is fixed to the upper sheet fixing part, and the upper sheet may have a protruding part that protrudes from the upper sheet fixing part toward the ground, and the protruding part may be located above the lower sheet. With this configuration, the opening of the lower sheet fixing part is covered by the folded part of the lower sheet, so that even if the lower end of the protruding part of the upper sheet is located above the opening of the lower sheet fixing part and water drips from the lower end of the protruding part of the upper sheet, the water can be prevented from entering the opening. Therefore, since there is no need to strictly determine the length of the upper sheet, the work of fixing the upper sheet becomes easier.

[0011] In the sheet fixing structure of the present invention, the lower end of the protruding portion of the upper sheet may be disposed closer to the ground than the lower sheet fixing portion. With this configuration, the opening of the lower sheet fixing portion is doubly covered by the protruding portion of the upper sheet and the folded-back portion of the lower sheet. This makes it possible to more reliably prevent water from entering the opening.

[0012] In the sheet fixing structure of the present invention, the upper sheet fixing portion may have a bottom wall along the depth direction, a pair of side walls connected to the side of the bottom wall, a fixing groove formed between the bottom wall and the pair of side walls into which the upper sheet is inserted, and an upper spring inserted into the fixing groove from above the upper sheet and pressing the upper sheet against the pair of side walls to fix it in the fixing groove, and the lower sheet fixing portion may have a first pressing piece extending from the outside of the side wall on the ground side of the upper sheet fixing portion, a second pressing piece facing the first pressing piece and forming the opening between its tip and the tip of the first pressing piece, and a lower spring interposed between the first pressing piece and the second pressing piece to press the lower sheet against the first pressing piece and the second pressing piece. With this configuration, the lower sheet fixing portion can be located near the upper sheet fixing portion, so that the length of the upper sheet required to place the protruding portion of the upper sheet above the lower sheet can be shortened, thereby reducing costs.

[0013] In the sheet fixing structure of the present invention, the second pressing piece may be disposed diagonally below the first pressing piece. With this configuration, the second pressing piece is disposed diagonally below the first pressing piece, so that the first pressing piece is disposed inclined toward the ground instead of facing upward, and therefore, when the lower sheet has been fixed to the lower-side sheet fixing section, the leading end of the folded-back portion of the lower sheet is guided to cover the opening in the direction in which the first pressing piece protrudes, so that the opening can be naturally covered by the folded-back portion.

[0014] The sheet fixing structure of the present invention may also include a net disposed under the lower sheet, and a fixing spring interposed between the first and second pressing pieces to press the net against the first and second pressing pieces, and the upper end of the net may be sandwiched between the fixing spring and the lower spring. With this configuration, since the upper end of the net is sandwiched between the fixing spring and the lower spring, the upper end of the net does not protrude above the folded-back portion of the lower sheet. Therefore, water does not adhere to the upper end of the net, and water can be prevented from entering the opening through the net.

[0015] The sheet fixing structure of the present invention may further include a pressing metal fitting attached to the upper sheet fixing part for pressing the protruding part of the upper sheet so that the lower end of the protruding part faces the ground. With this configuration, the lower end of the protruding part of the upper sheet fixed in the fixing groove of the upper sheet fixing part can be maintained in a position facing the ground, so that the protruding part of the upper sheet can be easily positioned above the folded-back part of the lower sheet.

[0016] In the sheet fixing structure of the present invention, the lower sheet may be a sheet capable of opening and closing the ventilation opening of the simple structure, and the pressing metal fitting may be a band holding metal fitting that holds one end of a band that prevents the lower sheet from flapping. With this configuration, even if the protruding part of the upper sheet tries to return to the top side of the simple structure by its own restoring force, the protruding part is pressed down by the band holding metal fitting and the band, so that the protruding part can be prevented from returning to the top side of the simple structure.

[0017] In the sheet fixing structure of the present invention, the side wall on the top side of the upper sheet fixing portion may have a sheet holding portion capable of holding a hard sheet. With this configuration, not only a soft sheet but also a hard sheet can be fixed to the framework.

[0018] The sheet fixing structure of the present invention includes a fixing frame that extends from the boundary between the bottom wall and the side wall on the ground side toward the ground side and has the second pressing piece connected to its tip, and a water receiving piece that is provided on the fixing frame and faces the bottom wall. The fixing frame includes an inclined portion that extends obliquely from the boundary toward the top side. Piece According to this configuration, water accumulated in the fixing groove of the upper sheet fixing portion is easily collected by the water receiving piece, so that it is possible to more reliably prevent rainwater from entering the vinyl greenhouse.

[0019] In the sheet fixing structure of the present invention, the sheet fastening member may be symmetrical in the depth direction. With this configuration, there is no risk of misassembly when the sheet fastening member is fixed to the framework, which makes it easier to assemble the vinyl greenhouse.

[0020] The sheet fixing method of the present invention is a method for fixing an upper sheet on the top side of the sheet fixing material and a lower sheet on the ground side of the sheet fixing material, the method including a step of fixing the upper sheet to the upper sheet fixing part, and a step of fixing the upper end of the lower sheet to the opening of the lower sheet fixing part with the upper end of the lower sheet folded back toward the ground side, and covering the opening with the folded back part of the lower sheet. According to this configuration, the opening of the lower sheet fixing part is covered by the folded back part of the lower sheet, so that water such as rainwater can be prevented from entering the opening. Effect of the Invention

[0021] According to the sheet fixing structure and sheet fixing method of the present invention, water can be prevented from entering the opening of the lower sheet fixing portion where the lower sheet is fixed in the sheet fastening material, thereby preventing water from entering the vinyl greenhouse. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a front view of a vinyl greenhouse in which the sheet fixing structure of the present embodiment is used. [Diagram 2] FIG. 2 is a partially enlarged perspective view of the vinyl greenhouse shown in FIG. [Diagram 3] 3(A) is an enlarged front cross-sectional view of a portion W of the vinyl greenhouse shown in Fig. 1. Fig. 3(B) is a partially enlarged view of Fig. 3(A). [Figure 4] 4 is a front cross-sectional view showing a state before a band holding member is attached to an upper sheet fixing portion of a sheet fastening member in the sheet fixing structure shown in FIG. 3(A). FIG. [Diagram 5] FIG. 10 is a front cross-sectional view illustrating the state in which the upper sheet is fixed to the upper sheet fixing portion of the sheet retaining material, which is a diagram for explaining the procedure of the sheet fixing method of the present embodiment. [Figure 6] FIG. 10 is a front cross-sectional view illustrating the state in which the net has been fixed to the lower sheet fixing portion of the sheet retaining material, illustrating the procedure of the sheet fixing method of the present embodiment. [Figure 7] 1 is a front cross-sectional view of a sheet fixing structure including a sheet fastening material according to a first modified example. FIG. [Figure 8] 13 is a front cross-sectional view showing a state in which a hard sheet is fixed to a sheet holding portion in a sheet fixing structure including a sheet fastening member according to a second modified example. FIG. [Figure 9] 13 is a front cross-sectional view of a sheet fixing structure including a sheet fastening material according to a third modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present embodiment will now be described with reference to the drawings, in which like reference numerals denote like parts throughout the several views.

[0024] The sheet fixing structure 1 of the present invention is used to fix an upper sheet S1 and a lower sheet S2 to the frame F of a vinyl greenhouse H, which is a simple structure having a plurality of arch-shaped frames F arranged in a row in the depth direction relative to the ground.

[0025] As shown in Figures 1 to 3, the sheet fixing structure 1 of this embodiment comprises a sheet fixing material 4 that is spanned between the top of a vinyl greenhouse H and the ground along the depth direction of a framework F and has an upper sheet fixing portion 2 and a lower sheet fixing portion 3 that is positioned on the ground side of the upper sheet fixing portion 2 and has an opening A, and a lower sheet S2 that is positioned on the ground side of the sheet fixing material 4 of the framework F and fixed to the lower sheet fixing portion 3.

[0026] Although not shown, the sheet fastening materials 4 of this embodiment are provided one each along the depth direction at the upper part of each side surface of the vinyl greenhouse H, sandwiching the apex of the arch-shaped framework F. Then, by fixing each lower end portion of the upper sheet S1 to the upper sheet fixing portion 2 of each sheet fastening material 4, the upper sheet S1 is extended on the roof portion of the vinyl greenhouse H.

[0027] 1 and 2, in this embodiment, the vinyl greenhouse H is a row-type greenhouse with ridges lined up in the left-right direction, and a ventilation opening O is provided in the valley between adjacent vinyl greenhouses H, H. A net N that covers the ventilation opening O and the upper end side of a lower sheet S2 that opens and closes the ventilation opening O are fixed to the lower sheet fixing portion 3 of the sheet fixing material 4.

[0028] Although not described in detail, as shown in FIG. 2, a shaft 10 is attached to the lower end of the lower sheet S2, and by driving and rotating the shaft 10 with a driving machine (not shown), the lower sheet S2 can be wound up or unwound, and the ventilation opening O can be opened or closed to ventilate the inside of the vinyl greenhouse H.

[0029] Therefore, according to the sheet fixing structure 1 of this embodiment, as shown in Figure 1, an upper sheet S1 covering the roof portion of the vinyl greenhouse H and a lower sheet S2 opening and closing the ventilation opening O can be fixed to the framework F of the vinyl greenhouse H.

[0030] In this embodiment, as shown in Fig. 1, since a plurality of vinyl greenhouses H are connected in a row in the left-right direction in a row-type structure, the sheet fixing structure 1 in this embodiment is used to fix the upper sheet S1 covering the roof of the vinyl greenhouse H and the lower sheet S2 covering the valley of the vinyl greenhouse H to the framework F. However, in the case where each vinyl greenhouse H is a stand-alone type installed independently (not shown), the sheet fixing structure 1 may be installed on the shoulder of the vinyl greenhouse H and used to fix the upper sheet S1 covering the roof of the vinyl greenhouse H and the lower sheet S2 covering the side of the vinyl greenhouse H.

[0031] 1, a trough T that extends in the depth direction and collects rainwater is provided between adjacent vinyl greenhouses H, H. Although not shown, when the lower sheet S2 is fully extended and the ventilation opening O is closed, the shaft 10 enters the trough T. Therefore, when the ventilation opening O is closed, the rainwater that has adhered to the surface of the lower sheet S2 runs down the surface of the lower sheet S2 and is discharged into the trough T.

[0032] The sheets S1, S2 stretched over the framework F of the vinyl greenhouse H are made of soft sheets such as polyolefin films, for example, polyvinyl chloride films, PET films, and the like.

[0033] In this embodiment, the sheet fixing structure 1 is used to construct the vinyl greenhouse H, but it may also be used to construct a simple structure other than the vinyl greenhouse H, such as a simple warehouse.

[0034] Each part of the sheet fixing structure 1 of this embodiment will be described in detail below. As shown in Fig. 3(A), the sheet fastening member 4 of this embodiment includes an upper sheet fixing portion 2 to which the upper sheet S1 is fixed, a lower sheet fixing portion 3 disposed on the lower right side of the upper sheet fixing portion 2 in the figure to which the lower sheet S2 is fixed, and a dew receiving frame 5 disposed on the lower left side of the upper sheet fixing portion 2 in the figure.

[0035] Then, when the sheet fixing material 4 is attached to the frame F, the lower sheet fixing portion 3 is positioned on the ground side relative to the upper sheet fixing portion 2, and the dew receiving frame 5 is positioned on the top side of the vinyl greenhouse H relative to the upper sheet fixing portion 2.

[0036] Specifically, the upper sheet fixing portion 2 of this embodiment, as shown in Figure 3 (A), is equipped with an upper frame 20 having a flat bottom wall 21 extending along the depth direction, and a pair of side walls 22, 23 that curve from the side ends of the bottom wall 21 and incline toward each other, and in which the bottom wall 21 and the pair of side walls 22, 23 form a fixing groove 24 whose opening width is narrower than the width of the bottom wall 21.

[0037] 3(A), the upper sheet S1 is inserted into the fixing groove 24, and the corrugated upper spring 25 is inserted from above the upper sheet S1. When the upper spring 25 is inserted into the fixing groove 24, it is compressed in the width direction by the pair of side walls 22, 23, so that the upper sheet S1 is pressed against the pair of side walls 22, 23 by the upper spring 25 and fixed to the upper frame 20.

[0038] That is, the upper sheet fixing portion 2 in this embodiment is configured to include an upper frame 20 and an upper spring 25. As shown in Fig. 3(A), the tip of each side wall 22, 23 is provided with a convex portion 22a, 23a having a circular cross section, so that even if the upper sheet S1 abuts against the convex portion 22a, 23a, the upper sheet S1 is not damaged. Note that, although the upper spring 25 in this embodiment is a wave-shaped spring, it may be, for example, a coil spring other than the wave-shaped spring.

[0039] As shown in FIG. 3(A), the lower sheet fixing portion 3 in this embodiment includes a first pressure piece 30 extending diagonally upward from the outside of the side wall 23 on the right side in the figure, a fixed frame 31 connected to the lower right side of the bottom wall 21 in the figure, a second pressure piece 32 connected to the fixed frame 31 and positioned diagonally downward in the figure of the upper sheet fixing portion 2, facing the first pressure piece 30 and forming an opening A between the first pressure piece 30, and a lower spring 33 interposed between the first pressure piece 30 and the second pressure piece 32 and pressing the lower sheet S2 against the first pressure piece 30 and the second pressure piece 32 to fix it.

[0040] Specifically, as shown in Figure 3(A), the fixed frame 31 in this embodiment has a connection piece 31a extending vertically downward from the lower part of the bottom wall 21 relative to the bottom wall 21, and a flat bottom piece 31b extending from the tip of the connection piece 31a to the right in the figure and perpendicular to the connection piece 31a.

[0041] 3(A), the fixed frame 31 is provided with a water receiving piece 35 that extends perpendicularly to the connecting piece 31a from the tip of the connecting piece 31a to the left in the figure and faces the bottom wall 21. The water receiving piece 35 is also provided with a return piece 36 that rises obliquely from the tip toward the connecting piece 31a.

[0042] Since the water receiving piece 35 is provided in this manner, even if the upper sheet S1 is damaged when inserting the upper spring 25 into the fixing groove 24, causing a hole in the upper sheet S1, and rainwater collected in the fixing groove 24 of the upper frame 20 flows through the hole from the depth direction side end of the upper frame 20 to the back side of the bottom wall 21, the rainwater is collected by the water receiving piece 35 along the connection piece 31a arranged below the upper sheet fixing part 2, so that the rainwater can be prevented from entering the vinyl greenhouse H. In addition, since the water receiving piece 35 is provided with a return piece 36, the rainwater collected by the water receiving piece 35 will not leak outward even if the mounting angle of the sheet fastening material 4 to the framework F becomes somewhat large. However, the water receiving piece 35 is not an essential component and may be omitted.

[0043] In addition, a guide groove (not shown) is formed in the bottom piece 31b along the depth direction. Then, a plurality of screws 11 are screwed into the framework F at predetermined intervals along this guide groove, thereby connecting the sheet fastening material 4 to the framework F. By providing the guide groove in this manner, the screws 11 can be guided and also positioned.

[0044] As shown in Fig. 3(A), the outer shapes of the return piece 36 and the second pressing piece 32 are symmetrical and protrude outward. Therefore, although not shown, some of the screws 11 may be replaced with joint members that hook onto the return piece 36 and the second pressing piece 32 and embrace the framework F and the lower sheet fixing portion 3 to fix the sheet fastening material 4 to the framework F. In this way, the sheet fastening material 4 can be more firmly connected to the framework F while reducing costs and labor compared to replacing all the screws 11 with joint members.

[0045] As shown in Figure 3(A), the second pressing piece 32 has an inclined portion 32a extending at an angle from the tip of the bottom piece 31b toward the connecting piece 31a, a straight portion 32b extending from the tip of the inclined portion 32a in a direction perpendicular to the bottom piece 31b, and a convex portion 32c with a circular cross-section provided at the tip of the straight portion 32b, and is positioned diagonally below the first pressing piece 30.

[0046] As shown in FIG. 3(A), the upper end side of the net N covering the ventilation opening O is pressed against the first pressing piece 30 and the second pressing piece 32 by a wavy fixing spring 34 which is interposed at an angle from above the net N between the first pressing piece 30 and the inclined portion 32a of the second pressing piece 32, and fixed thereto.

[0047] 2, a groove Ta, the opening of which is narrower than the bottom, is provided at the end of the trough T. The bottom end of the net N is inserted into the groove Ta, and a wave-shaped spring Ts is inserted into the groove Ta from above the net N, so that the bottom end of the net N is fixed to the trough T by the elastic force of the spring Ts.

[0048] Therefore, even when the ventilation opening O is in an open state, the ventilation opening O is covered with the net N, so that it is possible to prevent insects and birds from entering through the ventilation opening O. As shown in Fig. 3(A), the net N is in contact with the tip of the second pressing piece 32, but since the tip of the second pressing piece 32 has a convex portion 32c having a circular cross section, the net N is not damaged.

[0049] 3(A), the lower sheet S2 is fixed between the first pressing piece 30 and the second pressing piece 32 with its upper end folded back toward the ground by a corrugated lower spring 33 interposed in an oblique position between the first pressing piece 30 and the straight portion 32b of the second pressing piece 32. Here, the first pressing piece 30 in this embodiment is inclined from the side wall 22 on the right side in FIG. 3(A) toward the upper right, so that when the lower sheet S2 is pressed by the lower spring 33 against the first pressing piece 30, its upper end is naturally folded back toward the right side in the figure, which is the ground side.

[0050] At this time, as shown in Fig. 3(A), the folded-back portion S2a of the lower sheet S2 is folded back so as to be longer than the opening width of the opening A, and the tip of the folded-back portion S2a is located closer to the ground than the second pressing piece 32. In other words, the opening A is covered by the folded-back portion S2a as shown in Fig. 3(A).

[0051] In this manner, when the opening A is covered by the folded portion S2a of the lower sheet S2, even if rainwater adheres to the folded portion S2a, the rainwater runs down the surface of the folded portion S2a to the lower end side of the lower sheet S2 and is discharged into the trough T. Therefore, in this embodiment, rainwater does not enter the opening A of the lower-side sheet fixing portion 3. Note that the folded portion S2a of the lower sheet S2 in this embodiment refers to the portion of the lower sheet S2 from the portion pressed against the first pressing piece 30 by the lower spring 33 to the upper end.

[0052] Also, as shown in FIG. 3(B), in this embodiment, the portion of the net N above the portion pressed against the first pressing piece 30 (hereinafter referred to as the "upper end Na of the net N") is folded back toward the lower end side of the net N and is clamped between the lower spring 33 and the fixing spring 34.

[0053] In this embodiment, the lower spring 33 and the fixed spring 34 are each a wave-shaped spring, but are not limited to a wave-shaped spring and may be, for example, a coil spring.

[0054] 3, the dew receiving frame 5 has an L-shaped cross section and is formed extending leftward from the lower part on the left side in the figure of the bottom wall 21 of the upper sheet fixing portion 2. In this way, condensation water generated on the inner surface of the upper sheet S1 due to the temperature difference between the inside and outside of the vinyl greenhouse H flows down the outer surface of the side wall 22 on the left side in the figure and is collected in the dew receiving frame 5.

[0055] Furthermore, a dew receiving device (not shown) having a drain pipe with an outlet disposed in the trough T is attached to the side end of the sheet fastening material 4 in the depth direction. Therefore, the condensation water collected in the dew receiving frame 5 is collected by the dew receiving device and discharged into the trough T through the drain pipe.

[0056] In addition, in this embodiment, as shown in Figures 2 and 3(A), a band retaining bracket 13 is attached to the fixing groove 24 of the upper frame 20 to hold one end of a band 12 that prevents the lower sheet S2 from flapping from above the upper spring 25.

[0057] 3(A), the band holding metal fitting 13 has a wave-shaped spring-like fixed portion 13a that is inserted into and attached to the fixing groove 24, an upright portion 13b that rises while curving from one end of the fixed portion 13a, and a hook portion 13c that extends parallel to the fixed portion 13a toward the right side in the figure from the tip of the upright portion 13b when the fixed portion 13a is attached to the fixing groove 24. The band holding metal fitting 13 can hold one end of the band 12 by hooking one end of the band 12 onto the hook portion 13c.

[0058] 2, the other end of the band 12 is connected to a pipe P attached to the trough T and connected to the trough T. However, the method of connecting the other end of the band 12 shown in FIG. 2 is only one example, and the method of connecting the other end of the band 12 is not particularly limited.

[0059] In this manner, in the present embodiment, the band 12 is disposed above the lower sheet S2. Therefore, even if the lower sheet S2 is blown by the wind and is likely to flap, the lower sheet S2 comes into contact with the band 12 and is prevented from further deformation, so that flapping of the lower sheet S2 can be prevented.

[0060] The band retaining metal fitting 13 also functions as a pressing metal fitting for pressing the lower end of the upper sheet S1 so that it faces the right side in the figure, which is the ground side, as shown in Fig. 3(A). Specifically, before the band retaining metal fitting 13 is inserted into the fixing groove 24, the upper sheet S1 is pressed against the bottom wall 21 and each side wall 22, 23 by the elastic force of the upper spring 25, so that the lower end of the upper sheet S1 is in a state of protruding from the fixing groove 24 along the right side wall 23 in the figure, as shown in Fig. 4. Then, when the band retaining metal fitting 13 is attached to the fixing groove 24, the protruding portion S1a of the upper sheet S1, which protruded from the fixing groove 24 of the upper sheet S1 along the right side wall 23 in Fig. 4, is pressed down by the hook portion 13c as shown in Fig. 3(A), so that the protruding portion S1a of the upper sheet S1 protrudes toward the ground side from the upper sheet fixing portion 2, and the lower end of the protruding portion S1a is maintained in a position facing the right side in the figure, which is the ground side.

[0061] At this time, the length of the protruding portion S1a of the upper sheet S1 is longer than the combined length of the width direction of the first pressing piece 30 and the opening width of the opening A, and the protruding portion S1a of the upper sheet S1 covers the upper side of the lower sheet S2 as shown in FIG. 3(A), and the lower end of the protruding portion S1a is located to the right of the right end of the lower sheet fixing portion 3 in the figure. Therefore, the opening A of the lower sheet fixing portion 3 is doubly covered by the protruding portion S1a of the upper sheet S1 and the folded-back portion S2a of the lower sheet S2. Therefore, rainwater attached to the surface of the protruding portion S1a of the upper sheet S1 facing the lower sheet fixing portion 3 flows from the lower end of the upper sheet S1 to the lower end of the lower sheet S2 and is discharged into the trough T.

[0062] In addition, even if a hole is opened in the protruding portion S1a of the upper sheet S1 and rainwater adhering to the surface of the protruding portion S1a of the upper sheet S1 flows through this hole onto the back surface of the upper sheet S1, the rainwater will flow along the back surface of the protruding portion S1a due to surface tension to the lower end side of the lower sheet S2 and be discharged into the trough T.

[0063] In addition, even if rainwater running down the protruding portion S1a of the upper sheet S1 drips from the protruding portion S1a of the upper sheet S1, the opening A is also covered by the folded portion S2a of the lower sheet S2, so the rainwater runs down the surface of the folded portion S2a of the lower sheet S2 to the lower end side of the lower sheet S2 and is discharged into the trough T. This reliably prevents rainwater from entering the opening A of the lower sheet fixing portion 3.

[0064] In this embodiment, the lower end of the upper sheet S1 is disposed closer to the ground than the lower sheet fixing portion 3 as shown in Fig. 3(A), but it may be disposed above the opening A of the lower sheet fixing portion 3. Even in such a case, the opening A of the lower sheet fixing portion 3 is covered by the folded-back portion S2a of the lower sheet S2, so that rainwater does not enter the opening A of the lower sheet fixing portion 3.

[0065] Next, a detailed description will be given of the steps of the method for fixing the sheets S1, S2 to the framework F. First, as shown in Fig. 5, the upper sheet S1 is inserted into the fixing groove 24 of the upper frame 20 in the upper-side sheet fixing portion 2, and the upper spring 25 is further inserted into the fixing groove 24 from above the upper sheet S1. Then, the upper sheet S1 is pressed against the pair of side walls 22, 23 by the elastic force of the upper spring 25, and is fixed in the fixing groove 24.

[0066] 6, with the net N inserted between the first pressing piece 30 and the second pressing piece 32 in the lower sheet fixing portion 3, the fixing spring 34 is interposed in an oblique position between the first pressing piece 30 and the inclined portion 32a of the second pressing piece 32 from above the net N. Then, the net N is pressed against the first pressing piece 30 and the second pressing piece 32 by the fixing spring 34, and is fixed between the first pressing piece 30 and the second pressing piece 32.

[0067] Thereafter, as shown in Fig. 6, with the upper end Na of the net N folded back toward the lower end, the upper end side of the lower sheet S2 is inserted between the first pressing piece 30 and the second pressing piece 32 with the length of the folded back portion S2a remaining from the upper end as shown in Fig. 4, and the lower spring 33 is interposed in an oblique position between the first pressing piece 30 and the straight portion 32b of the second pressing piece 32 from above the lower sheet S2. Then, the lower sheet S2 is pressed against the first pressing piece 30 and the second pressing piece 32 by the lower spring 33, and is fixed between the first pressing piece 30 and the second pressing piece 32 with the upper end folded back toward the lower end.

[0068] Here, the length of the folded-back portion S2a of the lower sheet S2 is set to be at least longer than the width of the opening A. Therefore, the lower sheet S2 fixed between the first pressing piece 30 and the second pressing piece 32 can cover the opening A of the lower-side sheet fixing portion 3 with the folded-back portion S2a.

[0069] In addition, if the upper end Na of the net N protrudes above the folded-back portion S2a of the lower sheet S2, when rainwater adheres to the upper end Na of the net N and the net N becomes wet, the net N will absorb the rainwater by capillary action, and the rainwater may enter the fixed frame 31, which is in the opening A, through the net N. In contrast, in this embodiment, the upper end Na of the net N is sandwiched between the fixing spring 34 and the lower spring 33, so the upper end Na of the net N does not protrude above the folded-back portion S2a of the lower sheet S2. Therefore, when the upper end Na of the net N is sandwiched between the fixing spring 34 and the lower spring 33 as in this embodiment, rainwater does not enter the opening A through the net N.

[0070] However, although not shown, if the upper end Na of the net N is set to a length such that it does not extend above the folded-back portion S2a of the lower sheet S2, even if it is not clamped between the fixing spring 34 and the lower spring 33, the upper end Na of the net N does not have to be clamped between the fixing spring 34 and the lower spring 33.

[0071] 3(A), the fixing portion 13a is inserted into the fixing groove 24 so that the hook portion 13c faces the valley side of the vinyl greenhouse H, and the elastic force of the fixing portion 13a attaches the band holding metal fitting 13 to the fixing groove 24. Then, the protruding portion S1a of the upper sheet S1 is pressed down by the hook portion 13c, so that the lower end of the protruding portion S1a of the upper sheet S1 can be maintained in a position facing the ground.

[0072] Here, as shown in Figure 4, the length of the protruding portion S1a of the upper sheet S1 fixed in the fixing groove 24 of the upper frame 20 is set to a length such that when the protruding portion S1a is pressed down by the hook portion 13c of the band retaining hardware 13, the lower end of the upper sheet S1 is positioned closer to the ground than the lower sheet fixing portion 3.

[0073] Therefore, as shown in Figure 3(A), when the band retaining bracket 13 is attached to the fixing groove 24, the opening A of the lower sheet fixing portion 3 is doubly covered by the protruding portion S1a of the upper sheet S1 and the folded-back portion S2a of the lower sheet S2, thereby more reliably preventing rainwater from entering the opening A.

[0074] As described above, the sheet fixing structure 1 of this embodiment comprises a sheet fastening material 4 which is spanned along the depth direction of the framework F between the top of a vinyl greenhouse H as a simple structure and the ground, and which has an upper sheet fixing portion 2 and a lower sheet fixing portion 3 which is arranged on the ground side of the upper sheet fixing portion 2 and has an opening A, and a lower sheet S2 which is arranged on the ground side of the sheet fastening material 4 of the framework F, inserted into the opening A of the lower sheet fixing portion 3, and is fixed with its upper end folded back toward the ground, and the opening A of the lower sheet fixing portion 3 is covered by the folded back portion S2a of the lower sheet S2.

[0075] According to this configuration, the opening A of the lower sheet fixing portion 3 is covered by the folded portion S2a of the lower sheet S2, so that water such as rainwater does not enter the opening A. Therefore, it is possible to prevent water from entering the vinyl greenhouse H through the gap between the lower sheet fixing portion 3 and the screw 11 screwed into the bottom piece 31b of the lower sheet fixing portion 3 to connect the sheet fastening material 4 to the framework F.

[0076] In addition, the sheet fixing structure 1 of this embodiment has an upper sheet S1 that covers the top side of the vinyl greenhouse H via the sheet fastening material 4 of the framework F and is fixed to the upper sheet fixing portion 2, and the upper sheet S1 has a protruding portion S1a that protrudes from the upper sheet fixing portion 2 toward the ground, and the protruding portion S1a is positioned above the lower sheet S2.

[0077] According to this configuration, the opening A of the lower sheet fixing portion 3 is covered by the folded-back portion S2a of the lower sheet S2, so that even if the lower end of the protruding portion S1a of the upper sheet S1 is positioned above the opening A of the lower sheet fixing portion 3 and water drips from the lower end of the protruding portion S1a of the upper sheet S1, the water can be prevented from entering the opening A of the lower sheet fixing portion 3. Therefore, according to this embodiment, there is no need to strictly determine the length of the upper sheet S1, which makes it easier to fix the upper sheet S1.

[0078] Furthermore, in the conventional sheet fixing structure shown in Patent Document 1, a groove frame portion having a groove for collecting water running down the back surface of the upper sheet is provided between the upper sheet fixing portion where the upper sheet is fixed and the lower sheet fixing portion where the lower sheet is fixed, thereby preventing water from entering the lower sheet fixing portion.However, in the present embodiment, water can be prevented from entering the opening A of the lower sheet fixing portion 3 without providing the groove frame portion, so that the material for the sheet fixing material 4 can be reduced compared to the conventional sheet fixing structure.

[0079] Furthermore, in the sheet fixing structure 1 of this embodiment, the lower end of the protruding portion S1a of the upper sheet S1 is disposed closer to the ground than the lower sheet fixing portion 3. With this configuration, the opening A of the lower sheet fixing portion 3 is doubly covered by the protruding portion S1a of the upper sheet S1 and the folded-back portion S2a of the lower sheet S2. Therefore, water adhering to the surface of the protruding portion S1a of the upper sheet S1 that faces the lower sheet fixing portion 3 flows from the protruding portion S1a of the upper sheet S1 to the lower end side of the lower sheet S2.

[0080] Furthermore, even if a hole is formed in the protruding portion S1a of the upper sheet S1, causing water adhering to the surface of the protruding portion S1a of the upper sheet S1 to flow to the back surface of the upper sheet S1, the water will flow along the back surface of the upper sheet S1 due to surface tension to the lower end side of the lower sheet S2.

[0081] Therefore, the above configuration can more reliably prevent water from entering the opening A. However, the lower end of the protruding portion S1a of the upper sheet S1 may be located above the lower-side sheet fixing portion 3. Even in such a case, the opening A of the lower-side sheet fixing portion 3 is covered by the folded-back portion S2a of the lower sheet S2, so that water can be prevented from entering the opening A of the lower-side sheet fixing portion 3.

[0082] In addition, in the sheet fixing structure 1 of this embodiment, the upper sheet fixing portion 2 has a bottom wall 21 along the depth direction, a pair of side walls 22, 23 connected to the sides of the bottom wall 21, a fixing groove 24 formed between the bottom wall 21 and the pair of side walls 22, 23 into which the upper sheet S1 is inserted, and an upper spring 25 inserted into the fixing groove 24 from above the upper sheet S1 and pressing the upper sheet S1 against the pair of side walls 22, 23 to fix it in the fixing groove 24, and the lower sheet fixing portion 3 has a first pressing piece 30 extending from the outside of the side wall 23 on the ground side of the upper sheet fixing portion 2, a second pressing piece 32 facing the first pressing piece 30 and forming an opening A between its tip and the tip of the first pressing piece 30, and a lower spring 33 interposed between the first pressing piece 30 and the second pressing piece 32 and pressing the lower sheet S2 against the first pressing piece 30 and the second pressing piece 32.

[0083] According to this configuration, the lower sheet fixing portion 3 can be disposed near the upper sheet fixing portion 2. Therefore, the length of the upper sheet S1 required to dispose the protruding portion S1a of the upper sheet S1 above the lower sheet S2 can be shortened, thereby reducing costs.

[0084] In the sheet fixing structure 1 of the present embodiment, the second pressing piece 32 is disposed obliquely below the first pressing piece 30 .

[0085] According to this configuration, the second pressing piece 32 is positioned diagonally below the first pressing piece 30, so that the first pressing piece 30 is positioned inclined toward the ground rather than facing upward. Therefore, when the lower sheet S2 has been fixed to the lower sheet fixing portion 3, the tip of the folded portion S2a of the lower sheet S2 is guided to cover the opening A in the protruding direction of the first pressing piece 30, so that the opening A can be naturally covered by the folded portion S2a.

[0086] In addition, the sheet fixing structure 1 of this embodiment has a net N arranged below the lower sheet S2, and a fixing spring 34 interposed between the first pressing piece 30 and the second pressing piece 32 to press the net N against the first pressing piece 30 and the second pressing piece 32, and the upper end Na of the net N is clamped between the fixing spring 34 and the lower spring 33.

[0087] According to this configuration, the upper end Na of the net N is sandwiched between the fixing spring 34 and the lower spring 33, so that the upper end Na of the net N does not protrude above the folded-back portion S2a of the lower sheet S2. Therefore, water does not adhere to the upper end Na of the net N, so that water can be prevented from entering the opening A through the net N. However, if the upper end Na of the net N is set to a length that does not protrude above the folded-back portion S2a of the lower sheet S2 when not sandwiched between the fixing spring 34 and the lower spring 33, the upper end Na of the net N does not need to be sandwiched between the fixing spring 34 and the lower spring 33.

[0088] In this embodiment, the net N and the lower sheet S2 are fixed to the lower-side sheet fixing portion 3, but only the lower sheet S2 may be fixed thereto.

[0089] In addition, the sheet fixing structure 1 of this embodiment has a band retaining bracket 13 as a pressing bracket that is attached to the upper sheet fixing portion 2 and presses the protruding portion S1a of the upper sheet S1 so that the lower end of the protruding portion S1a faces the ground.

[0090] According to this configuration, the lower end of the protruding portion S1a of the upper sheet S1 fixed in the fixing groove 24 of the upper sheet fixing portion 2 can be maintained in a position facing toward the ground, so that the protruding portion S1a of the upper sheet S1 can be easily positioned above the folded-back portion S2a of the lower sheet S2.

[0091] In this embodiment, the pressing metal fitting that holds the lower end of the protruding portion S1a of the upper sheet S1 toward the ground is a band holding metal fitting 13 that holds one end of a band 12 that prevents the flapping of the lower sheet S2 that can open and close the ventilation opening O. Therefore, even if the protruding portion S1a of the upper sheet S1 tries to return to the top side of the vinyl greenhouse H by its own restoring force, the protruding portion S1a is held down by the band holding metal fitting 13 and the band 12, so that the protruding portion S1a can be prevented from returning to the top side of the vinyl greenhouse H. Therefore, the protruding portion S1a of the upper sheet S1 can maintain a position that covers the upper part of the folded-back portion S2a of the lower sheet S2.

[0092] Furthermore, with this configuration, the pressing metal fitting not only holds the protruding portion S1a so that the lower end of the protruding portion S1a faces the ground, but also holds one end of the band 12, thereby avoiding an increase in the number of parts. However, a metal fitting dedicated to the pressing metal fitting may be provided in addition to the band holding metal fitting 13.

[0093] In addition, the sheet fixing method of this embodiment is a method for fixing an upper sheet S1 that is closer to the top of the vinyl greenhouse H than the sheet fixing material 4 and a lower sheet S2 that is closer to the ground than the sheet fixing material 4, to a sheet fixing material 4 that is spanned in the depth direction between the top of the vinyl greenhouse H as a simple structure having a plurality of arch-shaped frameworks F arranged in a row in the depth direction relative to the ground, and that has an upper sheet fixing portion 2 and a lower sheet fixing portion 3 that is arranged on the ground side of the upper sheet fixing portion 2 and has an opening A, the method includes a step of fixing the upper sheet S1 to the upper sheet fixing portion 2, and a step of fixing the upper end of the lower sheet S2 toward the ground side and fixing it in the opening A of the lower sheet fixing portion 3, and covering the opening A with the folded-back portion S2a of the lower sheet S2.

[0094] According to this sheet fixing method, the opening A of the lower sheet fixing part 3 is covered by the folded-back part S2a of the lower sheet S2, so that water such as rainwater does not enter the opening A. Therefore, it is possible to prevent water from entering the vinyl greenhouse H through the gap between the lower sheet fixing part 3 and the screw 11 screwed into the bottom piece 31b of the lower sheet fixing part 3 to connect the sheet fastening material 4 to the framework F.

[0095] The configuration of the sheet fastening material 4 shown in Fig. 3(A) is an example, and the configuration of the sheet fastening material 4 is not limited to the configuration shown in Fig. 3(A). Therefore, the first to third modified examples of the sheet fastening material 4 will be described in detail below.

[0096] First, a sheet fixing structure 1A including a sheet fastening member 4A according to a first modification will be described. The basic structure of the sheet fixing structure 1A according to this modification is the same as the sheet fixing structure 1 shown in Fig. 3(A). Below, the structure different from the sheet fixing structure 1 shown in Fig. 3(A) will be described, and the common structure will be assigned the same reference numerals and detailed description will be omitted.

[0097] As shown in Figure 7, the sheet fixing material 4A of the first modified example has a left-right symmetrical shape when viewed in the depth direction, and differs in that lower sheet fixing portions 3A and 3B are provided on both the left and right sides of the upper sheet fixing portion 2.

[0098] Specifically, as shown in FIG. 7, the lower sheet fixing portions 3A, 3B each have a first pressing piece 30A, 30B extending diagonally upward from the outside of each side wall 22, 23 of the upper sheet fixing portion 2, fixed frames 31A, 31B having an approximately L-shaped cross section extending in directions away from each other from the lower parts of both the left and right sides of the bottom wall 21 of the upper sheet fixing portion 2, and second pressing pieces 32A, 32B connected to the tips of each fixed frame 31A, 31B and facing each first pressing piece 30A, 30B to form openings A1, B1 between them and the first pressing pieces 30A, 30B.

[0099] Then, following a procedure similar to that of the sheet fixing structure 1 equipped with the sheet fastening material 4 shown in Figure 3(A), the upper sheet S1 is fixed to the upper sheet fixing portion 2 as shown in Figure 7, and the net N and the lower sheet S2 are fixed to the lower sheet fixing portion 3A, which is located on the right side of the figure, that is, the ground side of the upper sheet fixing portion 2, of the two lower sheet fixing portions 3A, 3B.

[0100] Furthermore, for example, when the sheet fixing material 4A shown in Figure 7 is fixed to the framework F with the left and right sides reversed, the lower sheet fixing portion 3B is positioned on the right side in the figure, which is the ground side of the upper sheet fixing portion 2, so that the net N and the lower sheet S2 can be fixed to the lower sheet fixing portion 3B.

[0101] That is, since the sheet fastening material 4A of the first modified example has a bilaterally symmetrical shape when viewed in the depth direction, it does not matter what direction it is attached to the framework F. Therefore, in the sheet fixing structure 1A equipped with the sheet fastening material 4A of the first modified example, there is no risk of misassembly when fixing the sheet fastening material 4A to the framework F, which makes it easier to assemble the vinyl greenhouse H.

[0102] Next, a sheet fixing structure 1B having a sheet fastening member 4B according to a second modification will be described. The basic configuration of the sheet fixing structure 1B according to this modification is the same as the sheet fixing structure 1 shown in Fig. 3(A). Below, configurations different from the sheet fixing structure 1 shown in Fig. 3(A) will be described, and common configurations will be assigned the same reference numerals and detailed descriptions will be omitted.

[0103] As shown in Figure 8, the second modified sheet fixing material 4B differs from the upper sheet fixing portion 2 of the sheet fixing material 4 shown in Figure 3 (A) in that, instead of the side wall 22 on the left side in the figure, which is the top side of the vinyl greenhouse H, it has a sheet holding portion 40 capable of holding a hard sheet S3 such as a polyester film or a fluorofilm.

[0104] 8, the sheet holding portion 40 has a bottom piece 40a and a pair of side pieces 40b, 40b standing vertically from each end of the bottom piece 40a, and receiving pieces 40c, 40c protruding outward from the upper ends of each of the side pieces 40b, 40b, with the side piece 40b on the right side in the figure being connected to the left end in the figure of the bottom wall 21 of the upper sheet fixing portion 2A, and being provided between the left end in the figure of the bottom wall 21 of the upper sheet fixing portion 2A and the dew receiving frame 5. In addition, a plurality of grooves (not shown) are formed in parallel along the depth direction on the inner surface of each of the side pieces 40b, 40b.

[0105] In the case where a hard sheet S3 is held by the sheet holding part 40 instead of fixing the upper sheet S1 made of a soft sheet to the upper sheet fixing part 2, as shown in Fig. 8, with the lower end of the hard sheet S3 covering the receiving pieces 40c, 40c of the sheet holding part 40, a U-shaped presser member 41 is placed over the hard sheet S3, and a fixing screw V is screwed in so as to penetrate the presser member 41 and the hard sheet S3 and engage with the grooves formed on the inner surfaces of the side pieces 40b, 40b. Then, the hard sheet S3 is sandwiched between the presser member 41 and each receiving piece 40c, 40c, and is held and fixed by the sheet holding part 40.

[0106] Although not shown, when fixing an upper sheet S1 made of a soft sheet to the upper sheet fixing portion 2A of the sheet fixing material 4B of the second modified example, the upper sheet S1 is inserted into the fixing groove 24 formed by the side piece 40b and side wall 23 of the sheet holding portion 40, and then the upper spring 25 is inserted into the fixing groove 24 from above the upper sheet S1 so as to press the upper sheet S1 against the opposing side piece 40b and side wall 23.

[0107] Therefore, in the sheet fixing structure 1B having the sheet fixing member 4B of the second modified example, not only the upper sheet S1 made of a soft sheet but also the hard sheet S3 can be fixed.

[0108] Next, a sheet fixing structure 1C including a sheet fastening member 4C according to a third modified example will be described. The basic structure of the sheet fixing structure 1C according to this modified example is the same as that of the sheet fixing structure 1 shown in Fig. 3(A). Below, the structure different from that of the sheet fixing structure 1 shown in Fig. 3(A) will be described, and the same reference numerals will be used for the common structure, and detailed description will be omitted.

[0109] As shown in Figure 9, the third modified sheet fixing material 4C differs in that the fixed frame 50 is equipped with an inclined piece 50a that extends obliquely from the boundary between the bottom wall 21 and the side wall 22 on the ground side toward the top side of the vinyl greenhouse H.

[0110] Specifically, as shown in Figure 9, the fixed frame 50 in the third modified sheet fixing material 4C comprises an inclined piece 50a extending diagonally to the left in Figure 9, which is the top side of the vinyl greenhouse H, from the boundary between the bottom wall 21 and the side wall 22 on the right side in the figure, a vertical piece 50b extending from the tip of the inclined piece 50a in a direction perpendicular to the bottom wall 21, and a flat bottom piece 50c extending from the tip of the vertical piece 50b in the right direction in Figure 9, which is the ground side, and perpendicular to the vertical piece 50b.

[0111] Furthermore, a second pressing piece 32 is provided adjacent to the tip of the bottom piece 50c of the fixed frame 50. The fixed frame 50 is provided with a water receiving piece 35 that extends from the tip of the vertical piece 50b to the left in FIG. 9, which is the top side of the vinyl greenhouse H, and is perpendicular to the vertical piece 50b and faces the bottom wall 21.

[0112] When the sheet fixing material 4C is installed between the top of the vinyl greenhouse H and the ground, the boundary between the bottom wall 21 and the side wall 22 on the ground side becomes the lowest point of the fixing groove 24. Therefore, if the upper sheet S1 is damaged when inserting the upper spring 25 into the fixing groove 24, for example, and a hole is created in the upper sheet S1, water leaking through the hole will collect at the lowest point of the fixing groove 24.

[0113] Here, in the third modified sheet fixing material 4C, an inclined piece 50a is connected to the boundary between the bottom wall 21 and the side wall 22, so that even if water that has accumulated at the lowest point of the fixing groove 24 flows from the depth-wise side end of the upper frame 20 to the back side of the bottom wall 21, the water is guided by the inclined piece 50a and travels down the vertical piece 50b to be collected in the water receiving piece 35.

[0114] Therefore, according to the sheet fixing structure 1C equipped with the sheet fixing material 4C of the third modified example, rainwater accumulated in the fixing groove 24 of the upper sheet fixing portion 2 can be easily collected in the water receiving piece 35, thereby more reliably preventing rainwater from entering the vinyl greenhouse H.

[0115] Although the preferred embodiment of the present invention has been described in detail above, it will be appreciated that modifications, variations and changes can be made thereto without departing from the scope of the appended claims. [Explanation of symbols]

[0116] DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C...sheet fixing structure, 2...upper sheet fixing portion, 3...lower sheet fixing portion, 4, 4A, 4B, 4C...sheet fastening member, 13...band retaining metal fitting (retaining metal fitting), 21...bottom wall, 22, 23...side wall, 24...fixing groove, 25...upper spring, 30...first retaining piece, 31, 50...fixing frame, 32, 32A, 32B...second retaining piece, 33 ···Lower spring, 34···Anchoring spring, 35···Water receiving piece, 40···Sheet holding part, 50a···Inclined piece, A, A1, B1···Opening, F···Framework, H···Vinyl greenhouse (simple structure), S1···Upper sheet, S1a···Protruding part, S2···Lower sheet, S2a···Folded part, S3···Hard sheet, N···Net, Na···Upper end of net, O···Ventilation hole

Claims

1. a sheet fastening material that is bridged between a top of a simple structure having a plurality of arch-shaped frameworks arranged in a line in a depth direction relative to the ground and the ground along the depth direction of the framework, the sheet fastening material having an upper sheet fixing portion and a lower sheet fixing portion that is arranged closer to the ground than the upper sheet fixing portion and has an opening; a lower sheet that is disposed on the ground side of the sheet fastening member of the framework and inserted into the opening of the lower sheet fixing portion, and is fixed in a state where an upper end of the lower sheet is folded back toward the ground side; The opening of the lower sheet fixing portion is covered by the folded-back portion of the lower sheet. A sheet fixing structure characterized by the above.

2. An upper sheet is provided which covers the top side of the frame from the sheet stopper and is fixed to the upper sheet fixing portion, the upper sheet has a protruding portion protruding from the upper sheet fixing portion toward the ground side, The protruding portion is disposed above the lower sheet.

2. The sheet fixing structure according to claim 1.

3. The lower end of the protruding portion of the upper sheet is disposed on the ground side relative to the lower sheet fixing portion.

3. The sheet fixing structure according to claim 2.

4. the upper sheet fixing portion has a bottom wall along the depth direction, a pair of side walls connected to the sides of the bottom wall, a fixing groove formed between the bottom wall and the pair of side walls and into which the upper sheet is inserted, and an upper spring inserted into the fixing groove from above the upper sheet and pressing the upper sheet against the pair of side walls to fix it in the fixing groove, The lower sheet fixing portion has a first pressing piece extending from the outside of the side wall of the upper sheet fixing portion on the ground side, a second pressing piece facing the first pressing piece and forming the opening between a tip of the first pressing piece and a tip of the first pressing piece, and a lower spring interposed between the first pressing piece and the second pressing piece to press the lower sheet against the first pressing piece and the second pressing piece.

4. The sheet fixing structure according to claim 2 or 3.

5. The second pressing piece is disposed diagonally below the first pressing piece.

5. The sheet fixing structure according to claim 4.

6. A net disposed under the lower sheet; a fixing spring interposed between the first pressing piece and the second pressing piece to press the net against the first pressing piece and the second pressing piece; The upper end of the net is sandwiched between the anchor spring and the lower spring.

6. The sheet fixing structure according to claim 4 or 5.

7. A pressing metal fitting is attached to the upper sheet fixing portion and presses the protruding portion of the upper sheet so that the lower end of the protruding portion faces the ground side.

7. A sheet fixing structure according to claim 4, wherein the sheet fixing structure is a sheet fixing structure.

8. The lower sheet is a sheet capable of opening and closing a ventilation opening of the simple structure, The pressing metal fitting is a band holding metal fitting that holds one end of a band that prevents the lower sheet from flapping.

8. The sheet fixing structure according to claim 7.

9. The side wall on the top side of the upper sheet fixing portion has a sheet holding portion capable of holding a hard sheet. A sheet fixing structure according to any one of claims 4 to 8.

10. A fixed frame extending from a boundary between the bottom wall and the side wall on the ground side toward the ground and having the second pressing piece connected to a tip of the fixed frame; a water receiving piece provided on the fixed frame and facing the bottom wall; The fixed frame has an inclined piece that extends obliquely from the border toward the top side. A sheet fixing structure according to any one of claims 4 to 9.

11. The sheet fastening member has a bilaterally symmetrical shape when viewed in the depth direction. A sheet fixing structure according to any one of claims 1 to 10.

12. A sheet fixing method for fixing an upper sheet on the top side of the sheet fixing material and a lower sheet on the ground side of the sheet fixing material, the sheet fixing material being bridged between the top of a simple structure having a plurality of arch-shaped frameworks arranged in a line in the depth direction relative to the ground and having an upper sheet fixing portion and a lower sheet fixing portion arranged on the ground side of the upper sheet fixing portion and having an opening, the method comprising the steps of: a step of fixing the upper sheet at the upper sheet fixing portion; and fixing the upper end of the lower sheet in the state of folding back the upper end of the lower sheet toward the ground side within the opening of the lower sheet fixing portion, and covering the opening with the folded back portion of the lower sheet. A sheet fixing method comprising the steps of:

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