Crop protection shed

Abstract

The invention relates to the technical field of greenhouses, and discloses a crop protection shed which comprises a greenhouse unit, and the greenhouse unit comprises two side frames arranged at intervals in the longitudinal direction; the supporting assembly comprises an upper beam, a supporting rod and a lower chord cable, the upper beam and the lower chord cable are connected between the two side frames, the middle of the upper beam hunches upwards, the lower chord cable is located below the upper beam, and the supporting rod is connected between the upper beam and the lower chord cable; the first covering layer is laid on the upper beam, and the position, corresponding to the upper beam, of the first covering layer arches upwards from the two longitudinal sides to the middle; the lower inhaul cables are arranged below the two transverse sides of the upper beam correspondingly, the two lower inhaul cables are connected to the two side frames correspondingly, the two transverse sides of the first covering layer are pressed downwards through the two lower inhaul cables correspondingly, and the positions, corresponding to the two lower inhaul cables, of the first covering layer are arched upwards from the two longitudinal sides to the middle; the wind resistance of the first covering layer is greatly improved, the stability of the internal supporting structure is enhanced, and the production and manufacturing cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of greenhouses, in particular to a crop protection shed. BACKGROUND

[0002] There are various structural forms of crop protection sheds, for example, the top side of some protection sheds is pulled with steel wires, and a film or sunshade net is installed on the steel wires. Since the steel wires are simply straightened, and the steel wires are flexible structures, according to the principle of force decomposition, only when the steel wires are bent downward will an upward resultant force be generated for bearing the shed roof load. When the wind or rain is large, the steel wire framework will produce a large swing, thereby causing the shed roof structure to be unstable, the film or sunshade net is repeatedly pulled and rubbed, and is easily damaged, the service life of the film or sunshade net is short, and at the same time, the phenomenon that rainwater cannot be timely and smoothly drained occurs, causing the shed roof to accumulate water, increasing the shed roof load, and damaging the protection shed. Some protection sheds are provided with a rigid triangular or arched top, and multiple arch rods are arranged along the length direction inside the arched shed. At this time, the rainwater can be drained along the width direction of the two sides. When multiple protection sheds are arranged side by side, a drainage ditch can be arranged at the connection of the two protection sheds, but the steel consumption is large, and the cost is high. In order to reduce the cost, some protection sheds do not arrange the drainage ditch, and the rainwater flows in the shed, causing the crop roots to be easily flooded.

[0003] It can be seen that in the current protection shed, the protection shed using steel wires to straighten has a small amount of material and low cost, but poor wind resistance, and rainwater cannot be drained outside the shed, while the rigid framework shed has strong wind resistance and rainwater can be arranged to be drained outside the shed, but the amount of material is large and the cost is high. Therefore, there is an urgent need for a crop protection shed which has stronger wind resistance, low material consumption, and can drain rainwater outside the shed. SUMMARY

[0004] The present application aims to provide a crop protection shed to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or create conditions.

[0005] The solution to the technical problem of the present application is: The utility model provides a crop protection shed, including big -arched shed unit, big -arched shed unit includes: side frame, two are arranged with interval along the longitudinal direction, support component, including upper beam, bracing and lower chord, upper beam with lower chord is connected between two side frame, the middle part of upper beam is upturned, lower chord is located the below of upper beam, bracing is connected between upper beam and lower chord, first cover layer, the first cover layer is laid on upper beam, the position of first cover layer corresponds the upturned of upper beam from longitudinal both sides to the middle part, the lower cable, the lateral both sides below of upper beam are provided with lower cable respectively, two lower cable are connected to two side frame respectively, two lower cable respectively press down the lateral both sides of first cover layer, and make the position of first cover layer correspond two lower cable all be upturned from longitudinal both sides to the middle part, wherein, support component with lower cable are provided with a plurality of along the lateral direction, and support component is arranged between two lower cable of adjacent two.

[0006] The technical scheme has at least the following beneficial effects: in the big -arched shed unit, the longitudinal direction is the length direction of the big -arched shed unit, and the lateral direction is the width direction of the big -arched shed unit, in the support component, the bracing is tightly pressed up and down to the upper beam and the lower chord, the first cover layer is laid on the upper beam, the pressure of the first cover layer is transmitted to the upper beam, from the upper beam to the bracing, the bracing transmits the force to the lower chord, at this time, the tensile force of the lower chord can be used to bear the shed roof load, thereby reducing the load strength requirement of the upper beam, and the lower cable is arranged below the lateral both sides of the upper beam respectively, the lateral both sides of the first cover layer can be pressed down, at this time, the two lower cables can transmit the downward force to the support component through the first cover layer, forming a spatial triangular prestressed structure, so that the top of the whole protection shed forms a stable structure, without arranging multiple vertical support structures along the longitudinal direction inside, the two side frames can provide support and support on the longitudinal both sides of the whole, saving the overall manufacturing cost, in addition, the multiple laterally arranged support components and lower cables can form a lateral support structure, so that the first cover layer forms multiple arch structures along the lateral direction, when the rain falls on the first cover layer, the rain can not only flow along the lateral both sides, but also flow along the longitudinal both sides, thereby accelerating the rainwater discharge efficiency, reducing the load received by the connection position of the two arch structures, when the two lower cables pull down the first cover layer, the curvature of the two lower cables and the curvature of the upper beam can be consistent, thereby making the first cover layer form a curved surface shape, further promoting the rainwater discharge, thereby greatly improving the rainwater discharge efficiency, strengthening the stability of the internal support structure, and being beneficial to reducing the production manufacturing cost.

[0007] As a further improvement of the above technical scheme, one side of the first cover layer is connected to one side of the upper beam, and the other side of the first cover layer can reciprocate along the longitudinal direction.

[0008] As a further improvement to the above technical solution, a longitudinally extending guide rail is provided on the top side of the upper beam, and a sliding member is slidably connected on the guide rail, with the other side of the first covering layer connected to the sliding member.

[0009] As a further improvement to the above technical solution, a pre-tensioning cable is connected between the lower chord and the two side frames.

[0010] As a further improvement to the above technical solution, a retractable second covering layer is connected between the two pretensioning cables and the side frame.

[0011] As a further improvement to the above technical solution, the present invention also includes a horizontal cable, which is connected between the plurality of lower chords.

[0012] As a further improvement to the above technical solution, at least two greenhouse units are arranged longitudinally, and a drainage ditch is provided between two adjacent side frames in two adjacent greenhouse units.

[0013] As a further improvement to the above technical solution, the height of one of the side frames is higher than the height of the other side frame, and in two adjacent greenhouse units, the portion of the side frame with higher height located above the drainage ditch is provided with a retractable third covering layer.

[0014] As a further improvement to the above technical solution, the greenhouse unit is provided with multiple first covering layers arranged longitudinally, and the multiple first covering layers arranged longitudinally form a covering assembly, which arches upward from both sides to the middle in the longitudinal direction.

[0015] As a further improvement to the above technical solution, the strut includes a first inclined section and a second inclined section. The top ends of the first inclined section and the second inclined section are respectively connected to the upper beam, and the bottom ends of the first inclined section and the second inclined section are respectively inclined towards each other and connected to the lower chord.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1This is a perspective view of an embodiment of the greenhouse unit of the present invention, showing only two pull cables and one support component.

[0019] Figure 2 This is a perspective view of a second embodiment of the greenhouse unit of the present invention, which only shows two pull cables and one support component.

[0020] Figure 3 This is a perspective view of Embodiment 3 of the greenhouse unit of the present invention.

[0021] Figure 4 This is a perspective view of Embodiment 4 of the present invention, which has two greenhouse units arranged longitudinally.

[0022] Figure 5 This is a perspective view of Embodiment 5 of the present invention, which has two greenhouse units arranged longitudinally.

[0023] Figure 6 This is a perspective view of Embodiment Six of the present invention, which features two greenhouse units arranged longitudinally.

[0024] In the attached diagram: 100-side frame, 210-upper beam, 220-strut, 221-first diagonal brace section, 222-second diagonal brace section, 230-lower chord, 300-lower cable, 400-pretensioner cable, 500-horizontal cable, 600-drainage ditch, 700-first covering layer, 800-third covering layer. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] Reference Figure 1 A crop protection shed includes a greenhouse unit, wherein the greenhouse unit includes a side frame 100, a support assembly, a first covering layer 700, and a pull cable 300, wherein: Two side frames 100 are spaced apart along the longitudinal direction; The support assembly includes an upper beam 210, a strut 220, and a lower chord 230. The upper beam 210 and the lower chord 230 are connected between the two side frames 100. The middle part of the upper beam 210 is arched upward. The lower chord 230 is located below the upper beam 210. The strut 220 is connected between the upper beam 210 and the lower chord 230. The first covering layer 700 is laid on the upper beam 210. The first covering layer 700 arches upward from both sides to the middle of the upper beam 210. The first covering layer 700 can be made of film, shade net, insect net, hail net, black and white film, etc. The upper beam 210 is provided with pull cables 300 on both sides below the horizontal direction. The two pull cables 300 are respectively connected to the two side frames 100. The two pull cables 300 press down the horizontal direction of the first cover layer 700, and make the first cover layer 700 arch upward from the longitudinal sides to the middle at the positions of the two pull cables 300. Multiple support components and pull cables 300 are arranged laterally. A support component is arranged between two adjacent pull cables 300. At this time, the pull cables 300 between two adjacent support components can directly abut against the top side of the first cover layer 700 to press down the first cover layer 700. Pressing holes can be provided on both sides of the first cover layer 700. Two pull cables 300 located on the two sides of the lateral direction can be passed through the pressing holes to press down the two sides of the first cover layer 700.

[0031] As described above, in the greenhouse unit, the longitudinal direction is the length direction of the greenhouse unit, and the transverse direction is the width direction of the greenhouse unit. In the support assembly, the strut 220 holds the upper beam 210 and the lower chord 230 tightly together. The first covering layer 700 is laid on the upper beam 210. The pressure of the first covering layer 700 is transmitted to the upper beam 210, and from the upper beam 210 to the strut 220. The strut 220 then transmits the force to the lower chord 230. At this time, the tension of the lower chord 230 can be used to bear the load of the greenhouse roof, thereby reducing the load strength requirement on the upper beam 210. Downward cables 300 are respectively installed below the transverse sides of the upper beam 210, which can press down the corresponding transverse sides of the first covering layer 700. At this time, the two downward cables 300 can transmit the downward force to the support assembly through the first covering layer 700, forming a spatial triangular prestressed structure. This makes the entire protective greenhouse roof form a stable structure, eliminating the need for internal longitudinal support. Multiple vertical support structures are installed, with two side frames 100 providing longitudinal support on both sides, saving overall manufacturing costs. In addition, multiple transversely arranged support components and pull cables 300 can form a transverse support structure, causing the first cover layer 700 to form multiple arched structures in the transverse direction. When rainwater falls onto the first cover layer 700, it can flow not only along the transverse sides but also along the longitudinal sides, thereby accelerating the outward discharge efficiency of rainwater and reducing the load on the connection point of the two arched structures. When the two pull cables 300 pull down the first cover layer 700, the curvature of the two pull cables 300 and the curvature of the upper beam 210 tend to be consistent, thereby making the first cover layer 700 form a curved shape, further promoting the outward discharge of rainwater. This greatly improves the efficiency of rainwater discharge, strengthens the stability of the internal support structure, and helps to reduce production and manufacturing costs.

[0032] The first covering layer 700 covers the upper beam 210 and is tensioned downwards by the lower cable 300. The first covering layer itself is subjected to a large downward tension, and since both the lower cable 300 and the upper beam 210 have the same upward convex curvature, the lower cable 300 can exert a uniform downward pressure on the first covering layer along the longitudinal direction, thus ensuring the uniformity of the tension on the first covering layer and preventing wrinkles. The large and uniform tension force on the first covering layer 700 ensures the wind resistance of the first covering layer and prevents it from shaking in the wind. Compared with traditional greenhouses where the covering material is placed on the greenhouse frame, which is just adding a layer to the structure, this application uses the first covering layer 700 as part of the structure, bearing the tension between the upper beam 210 and the lower cable 300. This not only saves on structural tension components but also tensions the first covering layer 700, improving its wind resistance.

[0033] Since the first covering layer 700 is entirely flat, there is no curved surface in the first covering layer 700. Arched and triangular slopes only have curvature in one direction, and are flat when unfolded and straightened. Therefore, existing greenhouses use arched and triangular slopes. This invention innovatively combines triangles with arched curves. The upper rod and the lower cable 300 have the same curvature, and the end face adopts a triangle. The curved upper rod is translated along the direction of the triangular slope of the end face to the position of the lower cable 300, thus obtaining a flat surface covering the first covering layer 700. After the first covering layer 700 is installed and tightened, a greenhouse structure with slopes in both directions is formed, which can better tighten the first covering layer 700 and increase the smoothness of drainage.

[0034] The first covering layer 700 can be fixed directly to the upper beam 210. However, to improve flexibility, in this embodiment, one side of the first covering layer 700 is connected to one side of the upper beam 210, and the other side of the first covering layer 700 can move back and forth longitudinally. When the two sides of the first covering layer 700 are far apart longitudinally on the upper beam 210, the first covering layer 700 is in an unfolded state on the upper beam 210, thus providing shielding and protection for the internal space. When it is necessary to enhance internal ventilation, one side of the first covering layer 700 can be moved closer to the other side, thereby retracting the first covering layer 700 and opening up the upper space.

[0035] When the first cover layer 700 directly contacts and moves relative to the upper beam 210, the friction between the first cover layer 700 and the upper beam 210 can easily damage the first cover layer 700 and reduce its service life. Therefore, in this embodiment, a longitudinally extending guide rail is provided on the top side of the upper beam 210, and a sliding member is slidably connected to the guide rail. The other side of the first cover layer 700 is connected to the sliding member. When it is necessary to fold up or unfold the first cover layer 700, the other side of the first cover layer 700 can slide on the guide rail via the sliding member, thereby reducing the friction between the first cover layer 700 and the upper beam 210, making the sliding of the first cover layer 700 smoother, and better protecting the first cover layer 700.

[0036] To further improve the overall structural stability, such as Figure 2 As shown, in this embodiment, a pre-tensioning cable 400 is connected between the lower chord 230 and the two side frames 100. A retractable second covering layer is connected between the two pre-tensioning cables 400 and the side frames 100. The second covering layer can be retracted by disassembly, rolling, folding, etc., or installed by installation, unrolling, unfolding, etc. The second covering layer can be a film, shade net, insect net, hail net, black and white film, etc. In order to enrich the overall functionality, the first covering layer 700 and the second covering layer can be selected with different structures. For example, the first covering layer 700 can be a film, and the second covering layer can be a structure other than a film, such as a shade net. In this way, by retracting and extending the first covering layer 700 and the second covering layer, the function of film and shade net can be switched. In practical applications, the position where the pretensioner 400 is connected to the lower chord 230 can be set at the connection point between the support rod 220 and the lower chord 230. This facilitates the connection and positioning of the pretensioner 400 on the lower chord 230. The pretensioner 400 can pull the upper chord downwards to fix the shape of the canopy when there is no load on the canopy. It also acts as a wind-resistant cable to prevent the suction force of the wind upwards and helps to prevent the overall twisting of the support components and out-of-plane instability. In this way, one cable plays multiple roles, and the connection using the pretensioner 400 is low-cost and simple to construct.

[0037] To strengthen the connection between multiple support components, such as Figure 3As shown, the present invention also includes a horizontal cable 500, which connects the multiple lower chord cables 230. In practical applications, the horizontal cable 500 can connect only one of the multiple lower chord cables 230, or multiple lower chord cables 230 can be connected at intervals along the front-back direction. The horizontal cable 500 can connect the lower chord cables 230 in multiple support components, which can better distribute the stress on each support component and prevent the support components from easily deforming under stress. In addition, a support cable can also be provided between multiple upper beams 210. The support cable is arranged below the first cover layer 700. In order to prevent the lower cable 300 from damaging the membrane, a plastic tube or other material can be sleeved on the lower cable 300, which can increase the contact area with the first cover layer 700 and prevent the first cover layer 700 from being worn through. A tensioning mechanism, such as a turnbuckle or ratchet tensioner, can be provided on the lower cable 300 to adjust the tension of the lower cable 300.

[0038] Multiple greenhouse units can be arranged at intervals of 300mm between supporting components and pull cables, effectively increasing the protection range of the crop protection greenhouse. To further enhance the overall coverage and protection range, such as... Figure 4 As shown, in this embodiment, at least two greenhouse units are arranged longitudinally, and a drainage ditch 600 is provided between two adjacent side frames 100 in two adjacent greenhouse units. The longitudinal arrangement of multiple greenhouse units can further increase the area covered and protected along the longitudinal direction. Since a drainage ditch 600 is provided between two greenhouses, adjacent greenhouse units can drain water into the drainage ditch 600, thus improving the efficiency of rainwater buffering and drainage between the two greenhouse units.

[0039] In the above embodiment, the two side frames 100 can be designed with equal height, such as... Figure 5As shown, in this embodiment, the height of one side frame 100 is higher than the height of the other side frame 100. Naturally, the support components, pull cables 300 and the first covering layer 700 disposed between the two side frames 100 are also inclined from the higher side frame 100 to the lower side frame 100. In two adjacent greenhouse units, the part of the higher side frame 100 above the drainage ditch 600 is provided with a retractable third covering layer 800. In practical applications, the first covering layer 700 can be retracted by disassembly, rolling, folding, etc., or installed by installation connection, unrolling, unfolding, etc. Because the two side frames 100 are not at the same height, the entire top of the crop protection shed tilts downwards to one side, which can further accelerate the drainage of rainwater. Furthermore, a retractable third covering layer 800 is installed at the top of the higher side frame 100. When the third covering layer 800 is retracted, the top of the higher side frame 100 can be opened, improving the ventilation effect inside. Even when it rains, it can reduce the amount of rainwater entering the shed. When the third covering layer 800 is installed at the top of the side frame 100, it can reduce the ventilation inside. This further enriches the overall functionality and improves the overall practicality.

[0040] To further enrich the overall functionality, an openable or closable skylight is provided between the first covering layer 700 or between the two longitudinally arranged greenhouse units. The skylight can be made of various materials, such as film or mesh. When it is necessary to partially open the first covering layer 700 or between the two longitudinally arranged greenhouse units for ventilation, the skylight can be opened; conversely, the skylight can be closed, thus better meeting different ventilation needs inside.

[0041] like Figure 6 As shown, in some embodiments, multiple greenhouse units are arranged longitudinally, and the multiple longitudinally arranged first covering layers 700 form a covering assembly. The covering assembly arches upward from both sides to the center longitudinally. In practical applications, the number of greenhouse units can be two, three, or four, etc. The first covering layers 700 within the multiple greenhouse units can be independent of each other or a single piece. Two greenhouse units can share a side frame 100, thereby better controlling costs. The entire covering assembly forms a structure that arches in the center and slopes downward towards both sides longitudinally. In this case, there is no need to set up drainage ditches 600 between two greenhouse units, which can achieve rapid drainage along both sides longitudinally.

[0042] To improve the uniformity of force transmission from the upper beam 210 to the lower chord 230, in this embodiment, the support rod 220 includes a first inclined support section 221 and a second inclined support section 222. The top ends of the first inclined support section 221 and the second inclined support section 222 are respectively connected to the upper beam 210, and the bottom ends of the first inclined support section 221 and the second inclined support section 222 are inclined towards each other and connected to the lower chord 230. The first inclined support section 221, the second inclined support section 222, and the upper beam 210 form a triangular structure, which can enhance the structural stability of the upper beam 210, increase the number of stress points on the upper beam 210, and better support the upper beam 210. Since the number of stress points supporting the upper beam 210 has increased, the material strength requirements of the upper beam 210 can be reduced, thereby achieving a column-free design while ensuring the stability of the membrane support and better controlling costs. In practical applications, multiple struts 220 can be installed between the upper beam 210 and the lower chord 230 to further improve the stability of force transmission.

[0043] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A crop protection shed, characterized by: Includes a greenhouse unit, wherein the greenhouse unit includes: Two side frames (100) are provided at longitudinal intervals; The support assembly includes an upper beam (210), a strut (220), and a lower chord (230). The upper beam (210) and the lower chord (230) are connected between two side frames (100). The middle part of the upper beam (210) is arched upward. The lower chord (230) is located below the upper beam (210). The strut (220) is connected between the upper beam (210) and the lower chord (230). The first covering layer (700) is laid on the upper beam (210), and the first covering layer (700) arches upward from both sides to the middle of the upper beam (210) in the longitudinal direction. The lower cable (300) is provided on the lower sides of the upper beam (210) respectively. The two lower cables (300) are respectively connected to the two side frames (100). The two lower cables (300) press down the lower sides of the first cover layer (700) respectively, and make the first cover layer (700) arch upward from the longitudinal sides to the middle of the two lower cables (300) at the corresponding positions of the two lower cables (300). The support components and the pull cables (300) are arranged in multiple ways along the lateral direction, and the support components are arranged between two adjacent pull cables (300).

2. The crop protection shed according to claim 1, characterized in that: One side of the first cover layer (700) is connected to one side of the upper beam (210), and the other side of the first cover layer (700) can reciprocate longitudinally.

3. The crop protection shed according to claim 2, characterized in that: The top side of the upper beam (210) is provided with a guide rail extending longitudinally, and a sliding member is slidably connected on the guide rail. The other side of the first cover layer (700) is connected to the sliding member.

4. The crop protection shed according to claim 1, characterized in that: The lower chord (230) is connected to the two side frames (100) by a pretensioner (400).

5. The crop protection shed according to claim 4, characterized in that: A retractable second cover is connected between the two pretensioned cables (400) and the side frame (100).

6. The crop protection shed according to claim 1, characterized in that: It also includes a cross cable (500) that is connected between the plurality of lower chords (230).

7. The crop protection shed according to claim 1, characterized in that: At least two greenhouse units are arranged longitudinally, and a drainage ditch (600) is provided between two adjacent side frames (100) in two adjacent greenhouse units.

8. The crop protection shed according to claim 7, characterized in that: One of the side frames (100) is higher than the other side frame (100). In two adjacent greenhouse units, the portion of the side frame (100) with the higher height located above the drainage ditch (600) is provided with a retractable third covering layer (800).

9. The crop protection shed according to claim 1, characterized in that: The greenhouse unit is provided with multiple longitudinal first covering layers (700), which together form a covering assembly. The covering assembly arches upward from both sides to the middle of the longitudinal direction.

10. The crop protection shed according to claim 1, characterized in that: The strut (220) includes a first diagonal brace section (221) and a second diagonal brace section (222). The top ends of the first diagonal brace section (221) and the second diagonal brace section (222) are respectively connected to the upper beam (210). The bottom ends of the first diagonal brace section (221) and the bottom ends of the second diagonal brace section (222) are respectively inclined towards each other and connected to the lower chord (230).

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