Mechanical plastic greenhouse suitable for crop rotation of artemisia and rice

Abstract

The utility model relates to the technical field of plastic greenhouse structures, in particular to a mechanical plastic greenhouse suitable for crop rotation of artemisia and rice. A stand-column-free plastic greenhouse structure is adopted, so that the land utilization rate is increased while the agricultural requirements of crops are met; the effective operation space in the plastic greenhouse is increased, and the requirement of crop production for realizing comprehensive and whole-process mechanization is met; oval steel pipes with higher strength are selected as structural materials, meanwhile, the included angles between a shed head and the ground and between column feet and the ground are reduced to form a smooth windward side, and the wind and snow load resistance of the structure is improved. The shed door facilitates entering and exiting and turning around of the agricultural machine, and the land utilization rate is increased. The greenhouse comprises a greenhouse body structure and a foundation (4), a covering is arranged on the upper surface of the greenhouse body structure, and the greenhouse body structure comprises an arch frame (1), greenhouse head stand columns (2), longitudinal pull rods (3), inclined struts (5), greenhouse head horizontal pull rods (7), clamping grooves (11) and supporting rods (12).

Description

TECHNICAL FIELD

[0001] The utility model relates to a plastic greenhouse structure technical field, concretely relates to a kind of suitable for machineable plastic greenhouse of rotation of chenopodium giganteum and rice. BACKGROUND

[0002] At present, the existing production greenhouse for the mode has many problems, such as old facilities, simple materials, small space, inconvenient production management, poor heat preservation and lighting, poor ventilation, low machineability, low wind resistance, etc., which further limits the growth level and yield of chenopodium giganteum and rice.

[0003] To solve the above problems, the utility model meets the agronomic planting needs of chenopodium giganteum and rice, optimizes the structure of the plastic greenhouse, improves the structural stability, and designs a new machineable plastic greenhouse. SUMMARY

[0004] The utility model provides a kind of suitable for machineable plastic greenhouse of rotation of chenopodium giganteum and rice, adopts no column plastic greenhouse structure, meets the crop agronomic demand while improving land utilization rate;Increase the effective working space inside the plastic greenhouse, meet the demand of realizing comprehensive mechanization of crop production;Structural material selects higher strength elliptical steel pipe, at the same time, the included angle between shed head, column foot and ground is reduced to form smooth windward surface, increase the wind and snow load capacity of structure;Shed door design facilitates the entry and exit of agricultural machinery and turning, improves land utilization rate;Adopt sawtooth ventilation structure, at the same time, ventilation openings are arranged around the plastic greenhouse, the ventilation area is large, the cooling and moisture removal effect is good in summer;Low cost, easy to assemble, suitable for promotion.

[0005] The technical solution of the utility model is as follows:

[0006] A machineable plastic greenhouse suitable for rotation of chenopodium giganteum and rice, wherein the machineable plastic greenhouse comprises a shed body structure and a foundation 4, the upper surface of the shed body structure is provided with a covering, the shed body structure comprises arches 1, shed head columns 2, longitudinal pull rods 3, inclined braces 5, shed head horizontal pull rods 7, clamping grooves 11 and support rods 12;

[0007] The foundation 4 is the ground or a spiral ground bolt connected with the lower end of the arches 1;

[0008] A plurality of groups of arches 1 are arranged longitudinally in parallel to form a shed body structure;A single group of arches 1 comprises left and right arch rods, the bottom ends of the left and right arch rods are fixed to the foundation 4, and the top ends of the left and right arch rods are connected to form a complete arch structure;

[0009] The middle part of the left and right side arch poles of the plurality of sets of arch frames 1 is bent, the left and right side support sections are formed below the bent part, the left and right side roof sections are formed above the bent part, and the included angle between the roof section and the ground is smaller than the included angle between the support section and the ground;

[0010] The plurality of sets of longitudinal pull rods 3 are arranged below the arch frames 1 and connected with the arch frames 1, arranged horizontally along the longitudinal direction, and cross the two ends of the shed structure;

[0011] A shed head horizontal pull rod 7 is arranged horizontally at each end of the plastic shed, and the two ends of the shed head horizontal pull rod 7 are connected with the arch frames 1;

[0012] Three shed head columns 2 are arranged at the two ends of the shed structure, the bottom ends of the shed head columns 2 are connected with the foundation 4, and the upper ends are connected with the shed head horizontal pull rod 7 and the arch frame 1 respectively;

[0013] The three shed head columns 2 form four shed doors 6, wherein the left and right shed doors 6 are formed by the support section of the arch frame 1, the shed head column 2, the shed head horizontal pull rod 7 and the ground, and the middle shed door 6 is formed by the shed head column 2, the shed head horizontal pull rod 7 and the ground;

[0014] The support rod 12 is arranged at the two ends of the shed structure, the lower end of the support rod 12 is connected with the shed head horizontal pull rod 7, and the upper end of the support rod 12 is connected with the arch frame 1;

[0015] The inclined braces 5 are arranged at the two ends and the middle part of the shed structure respectively, the top end of the inclined brace 5 at the two ends is connected with the arch frame 1 at the shed head, and the bottom end is connected with the bottom end of the sixth arch frame 1 at the same side, and the inclined brace 5 at the middle part is arranged at the support section and the roof section of the arch frame 1, and both ends are connected with the arch frame 1;

[0016] The two ends of the clamping groove 11 are fixedly connected with the support section and the roof section of the arch frame 1;

[0017] The clamping groove 11 fixedly connected with the support section of the arch frame 1 includes an upper support section clamping groove and a lower support section clamping groove, the upper support section clamping groove and the lower support section clamping groove are arranged in parallel along the longitudinal direction of the plastic shed, a film rolling rod 10 is arranged between the upper support section clamping groove and the lower support section clamping groove, and the upper support section clamping groove, the lower support section clamping groove and the film rolling rod 10 together form two side ventilation openings 9, and the two side ventilation openings 9 are opened and closed by moving the film rolling rod 10 between the upper support section clamping groove and the lower support section clamping groove;

[0018] The clamping groove 11 fixedly connected with the roof section of the arch frame 1 includes an upper roof section clamping groove and a lower roof section clamping groove, the upper roof section clamping groove and the lower roof section clamping groove are arranged in parallel along the longitudinal direction of the plastic shed, a film rolling rod 10 is arranged between the upper roof section clamping groove and the lower roof section clamping groove, and the upper roof section clamping groove, the lower roof section clamping groove and the film rolling rod 10 together form a top vertical ventilation opening 8, and the top vertical ventilation opening 8 is opened and closed by moving the film rolling rod 10 between the upper roof section clamping groove and the lower roof section clamping groove.

[0019] The lap joint of the arch 1 is connected with the fixing member; the shed head horizontal pull rod 7 is connected with the shed head stand 2, the longitudinal pull rod 3 is connected with the arch 1, and the arch 1 is connected with the inclined brace 5 through the hoop and the top spring.

[0020] The span of the plastic greenhouse suitable for the rotation of the artemisia and rice is 8 m, the length is 40-60 m, the arch distance is 1 m, the shoulder height is 2.5-3.0 m, and the ridge height is 4-4.5 m.

[0021] The angle between the arch support section at the two ends of the plastic greenhouse suitable for the rotation of the artemisia and rice and the ground is 80°, and the left arch rod at the shed head on the two sides is connected with the right arch rod at the shed head on the two sides, and the same position of the second arch 1 is connected, so that the angle between the plane where the arch 1 at the shed head on the two sides is located and the ground is 76°.

[0022] The width of the shed door 6 is 2 m, and the height is 2.7 m.

[0023] The covering outside the shed body structure adopts a light scattering PO film, and the width of the lower clamping groove of the support section of the ventilation opening 9 on the two sides is 3 cm, and the vertical height is 30 cm.

[0024] The length of the ventilation opening 9 on the two sides is 58 m, and the maximum width is 1.5 m.

[0025] The distance between the top shed section of the top vertical ventilation opening 8 and the arch 1 is 10 cm, the width of the lower clamping groove of the top shed section is 3 cm, the length of the top vertical ventilation opening 8 is 56 m, and the maximum width is 0.8 m.

[0026] The beneficial technical effects of the present application are:

[0027] I. The column-free plastic greenhouse structure meets the crop agronomic requirements while improving the land utilization rate;

[0028] II. The effective working space inside the plastic greenhouse is increased, meeting the demand for full mechanization of crop production;

[0029] III. The structural material is an oval steel pipe with higher strength, and the angle between the shed head, the column foot and the ground is reduced to form a smooth windward surface, increasing the wind and snow load capacity of the structure;

[0030] IV. The shed door design facilitates the entry and exit of agricultural machinery and turning, improving the land utilization rate;

[0031] V. The sawtooth ventilation structure is adopted, and ventilation openings are provided around the plastic greenhouse, with a large ventilation area, good summer cooling and moisture removal effect;

[0032] VI. This structure has low cost, simple assembly and is suitable for popularization. Attached Figure Description

[0033] Fig. 1 This is the front elevation view of the structure of this utility model;

[0034] Fig. 2 This is the left elevation view of the structure of this utility model;

[0035] Fig. 3 This is a schematic diagram of the overall structure of the mechanized plastic greenhouse suitable for rice-grass rotation according to this utility model.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Arch frame 2. Canopy end support column

[0038] 3. Longitudinal tie rods 4. Foundation

[0039] 5. Diagonal bracing 6. Shed door

[0040] 7. Horizontal tie rod at the canopy end; 8. Vertical ventilation opening at the top.

[0041] 9. Ventilation openings on both sides 10. Film rolling rod

[0042] 11. Slot 12. Support rod Detailed Implementation

[0043] like Figs. 1-3 As shown, a mechanized plastic greenhouse suitable for rice-grass rotation includes a greenhouse structure and a foundation 4. The upper surface of the greenhouse structure is covered with a covering. The greenhouse structure includes an arch frame 1, a greenhouse head column 2, a longitudinal tie rod 3, a diagonal brace 5, a greenhouse head horizontal tie rod 7, a slot 11, and a support rod 12.

[0044] The foundation 4 is a ground or spiral ground bolt, connected to the lower end of the arch frame 1.

[0045] Multiple sets of arch frames 1 are arranged in parallel along the longitudinal direction to form the canopy structure. Each set of arch frames 1 includes a left arch rod and a right arch rod. The bottom ends of the left and right arch rods are fixed to the foundation 4, and the top ends of the left and right arch rods are connected to form a complete arch structure.

[0046] The left and right arch members of the multiple arch frames 1 are bent in the middle, forming left and right support sections below the bend and left and right roof sections above the bend. The angle between the roof section and the ground is smaller than the angle between the support section and the ground.

[0047] Multiple sets of longitudinal tie rods 3 are located below the arch frame 1 and connected to the arch frame 1, arranged horizontally along the longitudinal direction, spanning both ends of the canopy structure.

[0048] A horizontal tie rod 7 is installed at each end of the plastic greenhouse, and the two ends of the horizontal tie rod 7 are connected to the arch frame 1.

[0049] Three end columns 2 are installed at both ends of the shed structure. The bottom end of the end column 2 is connected to the foundation 4, and the top end is connected to the horizontal tie rod 7 and the arch frame 1, respectively.

[0050] Three end posts 2 form four shed doors 6. The left and right shed doors 6 are composed of the supporting section of the arch frame 1, the end posts 2, the horizontal tie rods 7 and the ground, while the middle shed door 6 is composed of the end posts 2, the horizontal tie rods 7 and the ground.

[0051] During production, the film at greenhouse door 6 is rolled up, and the machine can operate in an "S" or "U" shape, turning around outside the plastic greenhouse and entering and exiting the plastic greenhouse through greenhouse door 6, which enhances the continuity of machine operation and saves land resources.

[0052] The support rods 12 are located at both ends of the canopy structure. The lower end of the support rod 12 is connected to the horizontal tie rod 7 at the canopy head, and the upper end of the support rod 12 is connected to the arch frame 1.

[0053] The diagonal braces 5 are respectively installed at both ends and the middle of the canopy structure. The top of the diagonal braces 5 at both ends is connected to the arch frame 1 at the canopy head, and the bottom is connected to the bottom of the sixth arch frame 1 on the same side. The diagonal braces 5 in the middle are respectively installed at the support section and the roof section of the arch frame 1, and both ends are connected to the arch frame 1.

[0054] The two ends of the slot 11 are fixedly connected to the support section and the roof section of the arch frame 1.

[0055] The slot 11, which is fixedly connected to the support section of the arch frame 1, includes an upper slot and a lower slot. The upper and lower slots are arranged parallel to each other along the longitudinal direction of the plastic greenhouse. A film-rolling rod 10 is provided between the upper and lower slots. The upper and lower slots, together with the film-rolling rod 10, form ventilation openings 9 on both sides. The ventilation openings 9 on both sides are opened and closed by moving the film-rolling rod 10 between the upper and lower slots.

[0056] The slot 11, which is fixedly connected to the roof section of the arch frame 1, includes an upper slot and a lower slot. The upper and lower slots are arranged parallel to each other along the longitudinal direction of the plastic greenhouse. A film-rolling rod 10 is provided between the upper and lower slots. The upper and lower slots, together with the film-rolling rod 10, constitute the top vertical ventilation opening 8. The top vertical ventilation opening 8 is opened and closed by moving the film-rolling rod 10 between the upper and lower slots.

[0057] In summer production, the top vertical air vents 8 and the two side air vents 9 are always kept open; in winter production, the top vertical air vents 8 or the two side air vents 9 are appropriately closed according to the heat preservation requirements to increase the heat preservation performance of the plastic greenhouse.

[0058] The lap joint of the arch 1 is connected with the sleeve and the fixing member. The horizontal pull rod 7 at the greenhouse head is connected with the greenhouse head column 2, the longitudinal pull rod 3 is connected with the arch 1, and the arch 1 is connected with the inclined brace 5 through the use of the hoop and the compression spring.

[0059] Preferably, the span of the plastic greenhouse suitable for the mechanized artemisia-rice rotation is 8 m, the length is 40-60 m, the arch distance is 1 m, the shoulder height is 2.5-3.0 m, and the ridge height is 4-4.5 m.

[0060] Preferably, in order to optimize the wind resistance of the structure, the angle between the arch support section at the two ends of the plastic greenhouse suitable for the mechanized artemisia-rice rotation and the ground is 80°, and the angle between the same position of the left arch rod and the right arch rod at the two greenhouse heads and the second arch 1 is connected, so that the angle between the plane where the arch 1 at the two greenhouse heads is located and the ground is 76°, which can reduce the wind pressure on the greenhouse body to a certain extent.

[0061] Preferably, the width of the greenhouse door 6 is 2 m, and the height is 2.7 m.

[0062] Preferably, the horizontal pull rod 7 at the greenhouse head is reinforced and treated by using a reinforcing rib or welding between the horizontal pull rod 7 at the greenhouse head and the greenhouse head column 2, the longitudinal pull rod 3 and the arch 1, and the arch 1 and the inclined brace 5.

[0063] Preferably, when the foundation 4 is land, the bottom end of the arch 1 is inserted into the ground by 0.8 m.

[0064] Preferably, when the foundation 4 is a spiral ground bolt, a high-strength spiral ground bolt is used as the foundation fixing method, and a flange plate is used to connect the upper arch 1. The specific arrangement is that two spiral ground bolts are arranged every three arches from the greenhouse head, and the remaining parts are fixed by being inserted into the soil, and the spiral ground bolt is used to fix the greenhouse head column.

[0065] Preferably, the ground bolt at the greenhouse head is buried to a depth of 120 cm, and the ground bolt at the remaining positions is buried to a depth of 80 cm.

[0066] Preferably, the covering on the outside of the greenhouse structure adopts a light scattering PO film. The width of the lower clamping groove of the support section of the two side air vents 9 is 3 cm, and the vertical height is 30 cm, so as to reduce the adverse effects such as lodging caused by strong wind damage to the artichoke. Preferably, the length of the two side air vents 9 is 58 m, and the maximum width is 1.5 m. The opening and closing degree is controlled by the film rolling rod 10, a larger ventilation area can effectively regulate the environment in the greenhouse, which is more conducive to cooling and moisture removal in summer production.

[0067] Preferably, the distance between the lower slot of the roof section of the top vertical ventilation opening 8 and the arch frame 1 is 10cm, the width of the lower slot of the roof section is 3cm, the length of the top vertical ventilation opening 8 is 56m, and the maximum width is 0.8m. The opening and closing degree is controlled by the film rolling rod 10, which can effectively cool and dehumidify during summer production, and is convenient for dealing with areas with abundant rainfall, ensuring normal ventilation during the rainy season.

[0068] The entire shed structure is constructed of Q235B steel, conforming to the current national standard GB / T 700 "Carbon Structural Steel". Arch frame 1 is made of elliptical galvanized steel pipe with an outer diameter of 55*30mm and a wall thickness of 2.0mm. Longitudinal tie rod 3 and diagonal brace 5 are made of galvanized steel pipe with a diameter of 32mm and a wall thickness of 2.0mm. Shed end column 2 and shed end horizontal tie rod 7 are made of elliptical galvanized steel pipe with a diameter of 55*30mm and a wall thickness of 2.0mm.

[0069] The working process of this utility model is as follows:

[0070] The plastic greenhouse adopts a prefabricated structure. When constructing it, the spiral ground bolts are first fixed in the soil using the matching tools.

[0071] Next, the arch frame 1 is installed: the lower ends of the left and right arch rods are fixed to the foundation 4, and the upper ends are fixed using sleeves and fasteners. Then, the longitudinal tie rod 3 is fixed to the arch frame 1 using matching fasteners; the horizontal tie rod 7 at the end of the canopy is fixed to the arch frame 1 at both ends of the canopy structure; the lower end of the canopy column 2 is connected to the foundation 4, and the upper end is connected to the horizontal tie rod 7 and the arch frame 1 respectively; the lower end of the support rod 12 is connected to the horizontal tie rod at the end of the canopy, and the upper end is connected to the arch frame 1; the diagonal brace 4 is connected to the arch frame 1. Then, the slots 11 are fixed to the arch frame 1 respectively, and the plastic greenhouse is covered and fixed. The slots 11 and the film rolling rod 10 form the ventilation openings 9 on both sides and the vertical ventilation opening 8 at the top.

[0072] In daily management, environmental regulation is mainly achieved through natural ventilation in the plastic greenhouse. Natural ventilation is achieved through the side ventilation openings 9 and the top vertical ventilation opening 8. The size of each ventilation opening is adjusted by the film rolling rod 10: during the day, the side ventilation openings 9 and the top vertical ventilation opening 8 are kept open to achieve good cooling and dehumidification; at night, the top vertical ventilation opening 8 is closed, and the opening and closing degree of the side ventilation openings 9 is selected according to the temperature to provide a good growing environment for crops.

[0073] During production, the plastic film at greenhouse door 6 is rolled up, and the agricultural machinery enters from the leftmost or rightmost greenhouse door 6, operating in an "S" or "U" shape. It turns around outside the plastic greenhouse, repeatedly entering and exiting the plastic greenhouse, reducing the number of times the agricultural machinery turns around during operation, enhancing the continuity of machine operation, and saving land resources.

Claims

1. A plastic greenhouse suitable for mechanization of rice-rice rotation, characterized in that: The plastic greenhouse includes a greenhouse body structure, a foundation (4), and a covering on the upper surface of the greenhouse body structure, wherein the greenhouse body structure includes arch frames (1), head columns (2), longitudinal pull rods (3), inclined braces (5), head horizontal pull rods (7), clamping grooves (11), and support rods (12); The foundation (4) is connected to the lower ends of the arch frames (1) and is either a ground or a spiral ground bolt; A plurality of groups of the arch frames (1) are arranged in parallel along the longitudinal direction to form the greenhouse body structure; each group of the arch frames (1) includes left and right arch rods, the bottom ends of the left and right arch rods are fixed to the foundation (4), and the top ends of the left and right arch rods are connected to form a complete arch structure; The middle portions of the left and right arch rods of each group of the arch frames (1) are bent, left and right support sections are formed below the bent portions, left and right roof sections are formed above the bent portions, and the included angle between the roof sections and the ground is smaller than the included angle between the support sections and the ground; A plurality of groups of the longitudinal pull rods (3) are arranged below the arch frames (1) and are connected to the arch frames (1), are arranged horizontally along the longitudinal direction, and span the two ends of the greenhouse body structure; A head horizontal pull rod (7) is arranged horizontally at each end of the plastic greenhouse, and the two ends of the head horizontal pull rod (7) are connected to the arch frames (1); Three head columns (2) are arranged at the two ends of the greenhouse body structure, the bottom ends of the head columns (2) are connected to the foundation (4), and the top ends of the head columns (2) are connected to the head horizontal pull rods (7) and the arch frames (1), respectively; The three head columns (2) form four greenhouse doors (6), wherein the left and right greenhouse doors (6) are formed by the support sections of the arch frames (1), the head columns (2), the head horizontal pull rods (7), and the ground, and the middle greenhouse door (6) is formed by the head columns (2), the head horizontal pull rods (7), and the ground; The support rods (12) are arranged at the two ends of the greenhouse body structure, the lower ends of the support rods (12) are connected to the head horizontal pull rods (7), and the upper ends of the support rods (12) are connected to the arch frames (1); The inclined braces (5) are arranged at the two ends and the middle portion of the greenhouse body structure, the top ends of the inclined braces (5) at the two ends are connected to the arch frames (1) at the head, the bottom ends of the inclined braces (5) at the two ends are connected to the bottom ends of the sixth arch frames (1) on the same side, and the inclined braces (5) at the middle portion are arranged on the support sections and the roof sections of the arch frames (1) and are connected to the arch frames (1) at both ends; The two ends of the clamping grooves (11) are fixedly connected to the support sections and the roof sections of the arch frames (1); The clamping grooves (11) fixedly connected to the support sections of the arch frames (1) include upper support section clamping grooves and lower support section clamping grooves, the upper support section clamping grooves and the lower support section clamping grooves are arranged in parallel along the longitudinal direction of the plastic greenhouse, a film rolling rod (10) is arranged between the upper support section clamping grooves and the lower support section clamping grooves, the upper support section clamping grooves, the lower support section clamping grooves, and the film rolling rod (10) together form two side ventilation openings (9), and the two side ventilation openings (9) are opened and closed by moving the film rolling rod (10) between the upper support section clamping grooves and the lower support section clamping grooves. The clamping slot (11) fixedly connected with the roof section of the arch frame (1) comprises an upper roof section clamping slot and a lower roof section clamping slot; the upper roof section clamping slot and the lower roof section clamping slot are arranged in parallel along the longitudinal direction of the plastic greenhouse; the upper roof section clamping slot and the lower roof section clamping slot are provided with a film rolling rod (10) therebetween; the upper roof section clamping slot, the lower roof section clamping slot and the film rolling rod (10) jointly constitute a top vertical ventilation opening (8); the top vertical ventilation opening (8) is opened and closed by moving the film rolling rod (10) between the upper roof section clamping slot and the lower roof section clamping slot. The overlapping sleeve and the fixing member are connected by the arch frame (1); the greenhouse head horizontal pull rod (7) and the greenhouse head vertical column (2), the longitudinal pull rod (3) and the arch frame (1), and the arch frame (1) and the inclined support (5) are connected by the hoop and the pressure spring.

2. The mechanized plastic greenhouse suitable for rice-rice rotation according to claim 1, characterized in that: The greenhouse span of the suitable mechanized plastic greenhouse for the rotation of artemisia and rice is 8 m, the length is 40-60 m, the arch distance is 1 m, the shoulder height is 2.5-3.0 m, and the ridge height is 4-4.5 m.

3. The plastic tunnel suitable for rice-rice rotation as claimed in claim 1, wherein: The angle between the arch support section at both ends of the suitable mechanized plastic greenhouse for the rotation of artemisia and rice and the ground is 80°, the left arch rod and the right arch rod at the greenhouse head are connected at the same position of the second arch (1), so that the angle between the plane where the arch (1) at the greenhouse head is located and the ground is 76°.

4. The plastic tunnel suitable for rice-rice rotation as claimed in claim 1, wherein: The width of the door (6) is 2 m, and the height is 2.7 m.

5. The plastic tunnel suitable for rice-rice rotation as claimed in claim 1, wherein: The covering outside the greenhouse structure adopts a light scattering PO film; the width of the lower clamping slot of the support section of the two side ventilation openings (9) is 3 cm, and the vertical height is 30 cm.

6. The plastic tunnel suitable for rice-rice rotation as claimed in claim 1, wherein: The length of the two side ventilation openings (9) is 58 m, and the maximum width is 1.5 m.

7. The plastic tunnel suitable for rice-rice rotation as claimed in claim 1, wherein: The distance between the lower clamping slot of the roof section of the top vertical ventilation opening (8) and the arch frame (1) is 10 cm, the width of the lower clamping slot of the roof section is 3 cm, the length of the top vertical ventilation opening (8) is 56 m, and the maximum width is 0.8 m.

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