JPH06104017B2 - Pressing member for greenhouse sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing member for a greenhouse sheet for pressing a sheet used for a roof of a greenhouse and fixing the sheet to a sheet receiving member.

[0002]

2. Description of the Related Art Generally, when a sheet is laid on a sheet receiving member such as a rafter which constitutes a roof frame of a greenhouse, a sheet pressing member for a greenhouse is used to press and fix the sheet on the sheet receiving member. ing.

By the way, when a sheet made of a fluorine resin film which transmits natural rays of the sun and has good weather resistance is stretched, since the fluorine resin film has a large thermal expansion, it is stretched in winter when the temperature is low. When installed, the temperature rises in the summer and the sheet thermally expands, causing wrinkles and sagging on the sheet.As a result, not only does the appearance deteriorate, but also fluttering due to wind causes noise and weakens the strength of the film. It was found that when problems occur, or when the nighttime temperature drops during the interim period, dew condensation collects on these wrinkles, causing water drops to fall on the crops.

Therefore, the applicant of the present invention provides the sheet with an elongation more than the elongation due to the thermal expansion corresponding to the operating temperature range in advance based on the temperature when the sheet is stretched and the expected temperature rise during use. By doing so, a pressing member for a greenhouse sheet that can prevent wrinkles from being generated due to temperature rise,
I applied for it in Japanese Patent Application No. 3-286896.

A pressing member A (hereinafter referred to as a pressing member) of the greenhouse sheet includes a sandwiching portion D for sandwiching a sheet S indicated by a chain line on a sheet receiving member B as shown in FIG.
When the sheet S is sandwiched, it has a pressing leg E that presses the sheet S downward in FIG. 12, and by fixing it with a screw F so as to overlap the sheet receiving member B, the pressing leg E presses the sheet S. The sheet S is forcibly extended in a direction orthogonal to the sheet receiving member B so as to give the sheet S an elongation equal to or larger than the thermal expansion of the sheet S due to an expected temperature rise.

That is, as shown in FIG. 13, a large number of sheet receiving members B are arranged in a greenhouse having ridge beams G, eave beams H and window frames I, and from above the sheets S spread on these sheet receiving members B. By fixing the pressing member A so as to be superposed on the sheet receiving member B, the sheet S is sandwiched and fixed while being stretched.
Is stretched on the three sheet receiving members B1, B2, B3 arranged between the ridge beam G and the eaves beam H as shown by hatching in FIG. The lower end portion is fixed to the master beam G and the eaves beam H by using a pressing rail J described later, and then the pressing member A is fixed so as to be stacked on the sheet receiving members B1, B2, and B3.

Incidentally, in FIG. 12, R is a mist material for supporting the intermediate portion in the length direction of the sheet receiving member B.
In FIG. 3, the mist material R is omitted. Further, in FIG. 13, K is a roof surface provided with the window frame I of the skylight L parallel to the master beam G, M is a side wall surface provided with a large number of sheet receiving members B, and N is an entrance O. And the end face on which a large number of the sheet receiving members B are arranged.

[0008]

However, as shown in FIG. 14, for example, the lengthwise end of the seat S is formed by the pressing rail J fixed on the lateral member Q provided on the eave beam H. Since the pressing member A is fixed, when the pressing member A is fixed, the pressing leg E of the pressing member A presses the sheet S downward in FIG. The corner of the end portion of E on the lateral member Q side is stronger than the middle portion of the pressing leg E in the lengthwise direction, and the sheet S is pressed as indicated by the chain line, and the sheet S is damaged by the corner. However, it may not be possible to prevent the sheet receiving member B from being damaged by the upper side corner.

The problem of avoiding tearing of the sheet S when the sheet S is pressed by using the pressing member A as described above is not only caused near the eaves beam H and the ridge beam G, but also, for example, When the skylight L is provided, since the window frame I of the skylight L is arranged orthogonal to the sheet receiving member B, it occurs even in the vicinity of the window frame I.
Further, it also occurs when a plurality of pressing members A are fixed to one sheet receiving member B.

An object of the present invention is to provide a pressing member for a greenhouse sheet, which can be fixed on the sheet receiving member while being stretched without damaging the sheet.

[0011]

In order to achieve the above object, in the present invention, a sheet for a greenhouse in which a sheet 5 is pressed on a sheet receiving member 4 in a greenhouse and the sheet 5 is fixed on the sheet receiving member 4. Of the sheet receiving member 4 having a width wider than that of the sheet receiving surface of the sheet receiving member 4.
And a sandwiching portion 8 for sandwiching the sheet receiving member 4 on the sheet receiving member 4, and extending in the longitudinal direction of the sandwiching portion 8, and at the time of sandwiching the sheet 5,
And a pressing leg portion 9 for pressing the sheet 5, and a projecting height of the pressing leg portion 9 with respect to the sandwiching portion 8 is set to a height that gives expansion to the sheet 5 when the sheet 5 is sandwiched. The inclined portions 9a are provided at both end portions of the pressing leg portion 9 in the lengthwise direction so that the protruding height is lowered toward the outside in the lengthwise direction.

[0012]

In the roof of a greenhouse in which transverse members extending in a direction orthogonal to the sheet receiving members 4 are provided at both ends of the plurality of sheet receiving members 4 in the longitudinal direction, for example, fluorine having thermal expansion property is used. When the sheet 5 made of a resin film is stretched,
After fixing the sheet 5 to the transverse member, the pressing member of the greenhouse sheet of the present invention is superposed on each sheet receiving member 4, and the sheet 5 is sandwiched by the sandwiching portion 8 on the sheet receiving member 4. With this, the sheet 5 can be pressed by the pressing leg portion 9, and the sheet 5 can be previously provided with an elongation equal to or more than the extension of the sheet 5 in the operating temperature range of the greenhouse. At this time, the strength with which both ends of the pressing leg portion 9 in the length direction press the sheet 5 can be made weaker than in the case where the inclined portion 9a is not provided, and the sheet 5 is pressed with the pressing leg portion 9a. It is possible to prevent the sheet 5 from breaking when pressed with. As a result, the sheet 5 can be pinched and fixed on the sheet receiving member 4 while giving a predetermined elongation without damaging the sheet 5.

Further, even if a sheet having a thermal expansion property, for example, a fluorine resin film is stretched on the roof of a greenhouse in winter, wrinkles and slack can be prevented from occurring in the sheet when the temperature rises. This not only makes the appearance worse, but also prevents noise generation due to fluttering by the wind and weakening the strength of the film, and also prevents damage to crops due to falling condensation even if there is a temperature drop in the middle period. You can

The height of the pressing leg portion 9 is set in consideration of the coefficient of thermal expansion of the sheet 5, the operating temperature range of the greenhouse, the length of the sheet receiving member 4, the arrangement interval, and the like. The sheet 5 has a rectangular shape and is fixed by the adjacent sheet receiving members 4 and transverse members arranged orthogonal to the sheet receiving members 4, and the normal sheet receiving members 4 are arranged at intervals thereof. Since it is about 8 to 10 times longer than
Considering that the restraining force of the seat 5 in the length direction of the sheet receiving member 4, that is, the full length direction thereof is very weak as compared with the restraining force of the sheet receiving member 4 in the width direction, that is, the arrangement direction, the pressing leg. The height of the portion 9 is set to a height at which the sheet 5 is provided with an elongation larger than the elongation calculated from the coefficient of thermal expansion of the sheet 5 and the operating temperature range of the greenhouse.

[0015]

EXAMPLE The greenhouse roof schematically shown in FIG.
From the eaves pillars 12, the gasshos 2 are obliquely arranged, and a plurality of the mist materials 3 are arranged in parallel on the gasshos 2 at predetermined intervals. The sheet receiving members 4 used as the sheets are arranged in parallel at predetermined intervals, and a sheet 5 (not shown in FIG. 4) is placed on each sheet receiving member 4 to be described later. The sheet is pressed by a pressing member) and fixed on the sheet receiving member 4.

Further, as shown in FIG. 5, an upper lateral member 14 for covering the master beam 13 from above is provided on the upper part of the master beam 13.
Is disposed to support the upper end portion of the sheet receiving member 4 on one side of the shoulder portion of the upper lateral member 14, and to seat the seat 5 on the one side of the top portion of the upper lateral member 14. The pressing rail 15 for pressing can be fixed from above.
In addition, 4a designates the upper end of the sheet receiving member 4 as the ridge beam 13
The screw 15a is a screw for fixing the pressing rail 15 together with the seat 5 to one side of the top of the upper lateral member 14.

Further, an eaves beam 17 is supported on the eaves column 12 via a bracket 16, and a lower lateral portion having a forked portion 18a is provided on the outer side in the width direction of the eaves beam 17, as shown in FIG. A supporting rail 19 that supports the direction member 18 and presses the seat 5 can be fixed to the open upper end of the forked portion 18a from above. Reference numeral 4b denotes the eave beam 17 at the lower end of the sheet receiving member 4 together with the lower lateral member 18.
Screw 19a is a screw for fixing the pressing rail 19 together with the seat 5 to the open upper end of the forked portion 18a. Also, the upper and lower lateral members 14, 1
8 and each of the pressing rails 15 and 19 are made of aluminum extrusion molding material.

As shown in FIG. 1, the sheet receiving member 4 is formed by bending a metal plate material, and has a fixed wall 41 fixed to the haze material 3 and both widthwise ends of the fixed wall 41. A pair of bent walls 42 and 43 bent upward, and receiving portions 44 and 45 that receive the pressing member 6 at the upper ends of the bent walls 42 and 43.
A space that is slightly narrower than the screw diameter of the screw 7 for fixing the pressing member 6 is provided between 4 and 45, and the pressing member 6 is mounted on the sheet receiving member 4 by screwing the screw 7 between the spaces. It is fixed to.

Therefore, the pressing member 6 has the structure shown in FIGS.
As shown in FIG. 3, a sandwiching portion 8 sandwiching the sheet 5 made of a heat-expandable fluororesin film between the receiving portions 44 and 45, and a pair extending diagonally downward from both widthwise end portions of the sandwiching portion 8. And a screw hole 71 for inserting the screw 7 at a predetermined interval in the thick portion 8a by providing a thick portion 8a in the widthwise center of the sandwiching portion 8. While being provided, the width of the sandwiching portion 8 is set to the both receiving portions 44, 45.
Is formed to be wider than the width of the sheet receiving surface, and the pair of pressing legs 9 are extended in the length direction of the sandwiching part 8, and the sandwiching part of the pressing leg 9 is formed. The protrusion height with respect to 8 is set to a height that gives expansion to the sheet 5 when the sheet 5 is clamped, and both ends in the length direction of the pressing leg portion 9 are pressed to form the pressing leg portion 9. In addition, the inclined portion 9a is provided so that the protruding height of the pressing leg portion 9 is lowered outward in the longitudinal direction.

That is, when the sheet 5 is sandwiched by the sandwiching portion 8 on both of the receiving portions 44 and 45, the sheet 5 is indicated by a chain line in FIG. 1 at the intermediate portion in the lengthwise direction of the pressing leg portion 9. While allowing the sheet to be pressed in the state shown, the sheet 5 is placed at the most distal end in the longitudinal direction of the inclined portion 9a.
It is possible to press in the state indicated by the solid line.

A protrusion 91 extending in the lengthwise direction of the pressing leg 9 is provided at the tip of the pressing leg 9 projecting downward in FIG. 1 to press the sheet 5. The width of the pressing surface at the middle portion in the longitudinal direction of is increased. 6
Reference numeral 1 is a reinforcing flange for reinforcing the pressing member 6.

Further, although the inclined portion 9a is formed by pressing both end portions in the length direction of the pressing member 6, the inclined portion 9a may be formed by obliquely cutting out both end portions in the length direction of the pressing member 6. Good.

The projecting height of the pressing leg portion 9 at the middle portion in the lengthwise direction with respect to the sandwiching portion 8 is set as follows.

That is, in general, when a plant is grown in a greenhouse, it is usually heated in the winter, and therefore generally does not fall below 10 ° C. Since the temperature becomes higher than the outside temperature,
The operating temperature range of the greenhouse is usually 10 to 42 ° C.
Therefore, when the coefficient of thermal expansion of the fluorine-based resin film in this temperature range was examined, it was found that, for example, with the product name TOYOFLON (a thickness of 60 microns manufactured by Toray Industries, Inc.), the minimum coefficient of expansion was 0.23%. understood. Therefore, when the film is used as the sheet 5, it is assumed that when the sheet 5 is stretched, it is possible to absorb thermal expansion by giving the sheet 5 an elongation slightly larger than 0.23%.
For example, if the sheet receiving member 4 having a length of 5 to 6 m is 60c
It is stretched over the roof of a greenhouse that is arranged at m intervals,
Since both ends in the width direction and both ends in the length direction of the sheet 5 are fixed, the extension of the sheet 5 in the direction parallel to the sheet receiving member 4 due to thermal expansion is restrained as compared with the extension in the orthogonal direction. As described above, it was confirmed that wrinkles were generated even when the sheet 5 was stretched by 0.23%. Then, it was observed that the pressing leg portion 9 pressed the sheet 5 downward to change the elongation given to the sheet 5 and wrinkles were generated.
It has been found that the sheet 5 is free from wrinkles and sagging when subjected to an elongation of 7%, that is, an elongation of about 3 times 0.23%.

Therefore, the height of the pressing leg portion 9 is calculated based on the arrangement interval of the sheet receiving member 4,
For example, when the arrangement interval is 60 cm, the distance is about 0.9 cm.

Next, the pressing member 6 constructed as described above.
The procedure for stretching the sheet 5 on the roof of the greenhouse using the above will be described.

That is, the sheet 5 is spread from the ridge side to the eaves side on the three sheet receiving members 4 arranged in parallel as shown in FIG. As shown in FIG. 5, the pressing rail 15 is fixed to one side of the top surface of the upper lateral member 14, and the lower end of the seat 5 in the longitudinal direction is also fixed to the lower lateral member as shown in FIG. It is fixed to the upper part of the forked part 18a of 18 by the pressing rail 19. Also,
Both ends of the sheet 5 in the width direction are attached and fixed to the both receiving portions 44 and 45 of the sheet receiving members 4 arranged on both sides using, for example, a double-sided tape T, and four sides of the sheet 5 are rectangular. Fixed to.

Therefore, the pressing member 6 having the same length as the sheet receiving member 4 is pressed against the upper surface of the sheet receiving member 4, and the pressing member 6 is screwed on the sheet receiving member 4 by screwing the screw 7. It is fixed to.

That is, by pressing the pressing member 6 arranged so as to overlap the sheet receiving member 4 downward, the pressing leg is pressed until the sandwiching portion 8 abuts on both receiving portions 44 and 45. The sheet 5 is pressed downward by the portion 9, and the sandwiching portion 8 is fixed to the sheet receiving member 4 by the screw 7, so that the sheet 5 is connected to the sandwiching portion 8 and the receiving portions 44 and 45. The sheets 5 are sandwiched between them, and when the sandwiching is completed, the sheet 5 is stretched according to the height of the pressing leg portion 9.

At this time, since the inclined portions 9a are provided at both ends in the length direction of the pressing leg portion 9, the pressing leg portion 9 is formed.
Since both ends in the length direction press the sheet 5 weakly as compared with the case where the inclined portion 9a is not provided, it is possible to prevent the sheet 5 from breaking, and to prevent the sheet 5 from breaking. The sheet 5 can be stretched by pressing the pressing leg 9.

Further, even when the sheet 5 contacts the upper ends of both ends in the length direction of the sheet receiving member 4 during the pressing of the sheet 5, the sheet 5 can be pressed without breaking.

When a plurality of pressing members 6 cut into shorter pieces than the sheet receiving member 4 are fixed to the sheet receiving member 4, for example, the pressing members 6 shown on the left side of FIG. 8 are fixed on the sheet receiving member 4. After that, the pressing member 6 shown on the right side of FIG. 8 is fixed onto the sheet receiving member 4, and when the pressing member 6 shown on the left side of FIG. 8 is fixed, the pressing leg portion 9 of the pressing member 6 is fixed. The sheet 5 is strongly pressed downward at the middle portion in the length direction, but the right end portion of the pressing leg portion 9 of the sheet pressing member 6 presses the sheet 5 weakly as compared with the case where the inclined portion 9a is not provided. Therefore, even though the widthwise center of the sheet 5 is supported by the upper portion of each sheet receiving member 4, the sheet 5 is not torn. Also, when fixing the pressing member 6 on the right side of FIG.
Despite the fact that the widthwise central portion of the seat 5 is supported by the upper portion of the sheet receiving member 4, the seat 5 can be fixed without breaking. Therefore, even when a plurality of short pressing members 6 are fixed to one sheet receiving member 4, the sheet 5 can be fixed without being damaged.

Therefore, when a sheet made of, for example, a fluororesin film having thermal expansion property is stretched on the roof of a greenhouse, wrinkles and sagging do not occur in the sheet 5 even if the temperature rises from the time of stretching, so that the greenhouse is greenhouse. It is possible to prevent the appearance of the film from deteriorating, and it is also possible to prevent fluttering due to the wind to generate noise and weaken the strength of the film.

In the above embodiment, the pressing leg portion 9 is used.
The inclined portion 9a was formed by pressing both ends in the length direction of the insert member. However, as shown in FIG. 9, the insert member 60 is formed separately from the pressing member 6, and the insert member 6 is formed.
0 may be formed by fitting so as to cover both ends of the pressing member 6 in the length direction.

The inserting member 60 is formed of, for example, synthetic resin into a groove shape as a whole, and as shown in FIGS. 9 to 11, a fitting portion 62 fitted to the outside of the pressing member 6 and a fitting portion 62. It is composed of a protrusion 63 which is continuous with the fitting portion 62 and which cannot be fitted, the inclined portion 9a is provided on the lower side of the protrusion 63, and the inner surface of the fitting portion 62 is provided with the above-mentioned A plurality of grooves 64 for receiving the thick portion 8a of the pressing member 6, the protrusions 91, and the reinforcing flanges 61, 61 are provided, and when the inserting member 60 is fitted to the end portion of the pressing member 6, the protruding portion 63 is formed. The protruding length from the end portion of the pressing member 6 is formed so as to be constant.

In this case, without pressing or cutting both ends of the pressing member 6 in the length direction,
By fitting the insertion member 60 into the end portion of the pressing member 6, the inclined portions 9a can be formed at both ends in the length direction of the pressing leg portion 9, so that the man-hours for processing the pressing member 6 can be reduced. It can be reduced, and the cost can be reduced accordingly.

When a large number of irregularities are formed on each reinforcing portion 61 provided at both ends of the sandwiching portion 8 in the width direction, it can be used as a slip stopper when the sheet 5 is stretched,
The tensioning work can be performed safely.

[0038]

As described above, the present invention relates to a greenhouse sheet pressing member for pressing a sheet 5 on the sheet receiving member 4 in a greenhouse and fixing the sheet 5 on the sheet receiving member 4. A width that is wider than the sheet receiving surface of the sheet receiving member 4, a sandwiching portion 8 that sandwiches the sheet 5 on the sheet receiving member 4, and a lengthwise direction of the sandwiching portion 8.
In addition, when the sheet 5 is clamped, the pressing leg portion 9 presses the sheet 5, and the protrusion height of the pressing leg portion 9 with respect to the clamp portion 8 is Sheet 5
Even if a sheet made of, for example, a fluorine-based resin film that has thermal expansion properties is stretched over the roof of a greenhouse in winter, it is possible to prevent the sheet from wrinkling or sagging when the temperature rises. Not only does it cause the appearance of wrinkles to deteriorate, but it also prevents the generation of noise due to fluttering by the wind and the weakening of the strength of the film. It is possible to prevent this, and since the inclined portions 9a that decrease the protruding height toward the outer side in the length direction are provided at both side ends in the length direction of the pressing leg portion 9, for example, a plurality of In the state where the sheet 5 is fixed to both ends of the sheet receiving member 4 in the length direction by the transverse members arranged in the direction orthogonal to the sheet receiving member 4, the sheet is pressed by the pressing leg portions 9 of the pressing member. Fixed by Even if that, it is possible to stretched without breaking the sheet 5. That is, when the sheet 5 is stretched, the strength with which both lengthwise ends of the pressing leg 9 press the sheet 5 is determined by the inclination 9a.
It can be made weaker than in the case where the sheet 5 is not provided, and the sheet 5 can be prevented from breaking when the sheet 5 is pressed by the pressing legs 9. As a result, the sheet 5 can be pinched and fixed on the sheet receiving member 4 while giving a predetermined elongation without damaging the sheet 5.

During the pressing of the sheet 5, the sheet 5
Even if it contacts the upper ends of both ends in the length direction of the sheet receiving member 4, it can be pinched and fixed to the sheet receiving member 4 without breaking the sheet 5, and a plurality of greenhouses can be attached to the sheet receiving member 4. Even when fixing the pressing member of the sheet for
The sheet 5 can be pinched and fixed to the sheet receiving member 4 without breaking.

[Brief description of drawings]

FIG. 1 is an end view showing a state where a sheet pressing member for a greenhouse sheet of the present invention sandwiches a sheet on a sheet receiving member.

FIG. 2 is a partial plan view showing one end of a pressing member for a greenhouse sheet of the present invention.

FIG. 3 is a side view of FIG.

FIG. 4 is a schematic sectional view of a greenhouse roof.

5 is an enlarged cross-sectional view of the greenhouse shown in FIG. 4 in the vicinity of the main beam.

6 is an enlarged cross-sectional view near the eaves beams of the greenhouse shown in FIG.

FIG. 7 is an explanatory diagram showing a state in which the seat is stretched.

FIG. 8 is an explanatory view of fixing a plurality of pressing members for greenhouse sheets to the sheet receiving member.

FIG. 9 is a partial vertical cross-sectional view of the insertion member fitted to the pressing member of the greenhouse sheet.

10 is a cross-sectional view taken along the line AA of FIG.

11 is a cross-sectional view taken along the line BB of FIG.

FIG. 12 is a cross-sectional view showing a conventional example.

FIG. 13 is a partial perspective view showing an example of a greenhouse in which a large number of sheet receiving members are arranged.

FIG. 14 is a cross-sectional view showing an example of tearing a sheet.

[Explanation of symbols]

 4 sheet receiving member (rafter) 5 sheet 8 sandwiching portion 9 pressing leg portion 9a inclined portion

Claims (1)

[Claims] 1. A pressing member for a greenhouse sheet for pressing a sheet 5 onto a sheet receiving member 4 in a greenhouse and fixing the sheet 5 onto the sheet receiving member 4, the sheet receiving surface of the sheet receiving member 4. A wider width, a sandwiching portion 8 that sandwiches the sheet 5 on the sheet receiving member 4, and a lengthwise direction of the sandwiching portion 8, and the sheet 5 is sandwiched when the sheet 5 is sandwiched. And a pressing leg portion 9 for pressing, and the protruding height of the pressing leg portion 9 with respect to the sandwiching portion 8 is defined by the sheet 5
When the sheet is sandwiched, the height of the sheet 5 is set so as to extend, and the projecting heights of the pressing legs 9 are decreased at both end portions in the length direction. A pressing member for a greenhouse sheet, characterized by being provided with.