A modified large-span plastic greenhouse based on a solar greenhouse arch frame and a reconstruction method

Abstract

The present invention relates to a modified large-span plastic greenhouse based on a solar greenhouse arch frame and a reconstruction method. The present invention includes a crossbeam, a roof arch frame and a column. The crossbeam includes an upper crossbeam, a lower crossbeam, a connecting angle steel and a web member for fixing the upper crossbeam and the lower crossbeam. There are two connecting angle steels, which are respectively arranged on both sides of the upper crossbeam and the lower crossbeam and connected to the upper crossbeam and the lower crossbeam. The roof arch frame includes an arch frame, an upper chord and a lower chord arranged in an inclined and parallel manner. The upper ends of the upper chord and the lower chord are connected to the upper end of the arch frame. The upper chord The lower end and the lower end of the lower chord are connected to the connecting angle steel; the arch frame, upper chord and lower chord are two groups, symmetrically arranged on both sides of the crossbeam, and a "T"-shaped connecting bracket is fixed above the upper crossbeam. The "T"-shaped connecting bracket includes horizontal struts and vertical struts that are perpendicular to each other. The two ends of the horizontal struts are respectively connected to the two groups of upper chords, the upper ends of the vertical struts are connected to the horizontal struts, and the lower ends are connected to the upper crossbeam. The upper ends of the columns are connected to the lower crossbeam, the lower ends of the columns are arranged on the column base, and the lower ends of the arch frames are arranged on the roof base. The present invention has a simple structure and complete functions. It not only recycles the abandoned solar greenhouse roof arch frames, but also reduces the construction cost of large-span plastic greenhouses, and can promote the development of facility agriculture.

Description

Technical Field

[0001] The present invention relates to the field of plastic greenhouse construction, in particular to the reconstruction of plastic greenhouses, and specifically to a modified large-span plastic greenhouse based on a solar greenhouse arch frame and a reconstruction method. Background Art

[0002] As a common type of facility, plastic greenhouses have the characteristics of low investment and easy operation, and are attracting more and more attention. The emergence of large-span plastic greenhouses has further improved the space utilization rate and environmental adaptability of the greenhouse, which is of great significance to the development of my country's facility agriculture and the increase in production and income of farmers.

[0003] Against the backdrop of the continuous updating of new technologies, solar greenhouses have begun to be upgraded and renovated. Some intact roof arches have been abandoned due to span issues, resulting in a certain amount of resource waste. At the same time, the span of large-span plastic greenhouses has continued to increase, the amount of steel used has increased, and construction costs have begun to rise year by year. These problems have begun to hinder the development of facility agriculture. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems existing in the background technology, the present invention provides a modified large-span plastic greenhouse based on the solar greenhouse arch frame and a reconstruction method. It has a simple structure and complete functions. It not only recycles the abandoned solar greenhouse roof arch frame, but also reduces the construction cost of the large-span plastic greenhouse, which can promote the development of facility agriculture.

[0005] The technical solution of the present invention is: the present invention is a modified large-span plastic greenhouse based on the solar greenhouse arch frame, and its special feature is that the modified large-span plastic greenhouse based on the solar greenhouse arch frame includes beams, roof arch frames and columns, the beams include upper beams, lower beams, connecting angle steels and web bars that fix the upper beams and the lower beams, there are two connecting angle steels, which are respectively arranged on both sides of the upper beams and the lower beams, and are connected to the upper beams and the lower beams, the roof arch frame includes an arch frame, an upper chord and a lower chord arranged inclined and parallel, the upper chord and The upper end of the lower chord is connected to the upper end of the arch frame, and the lower ends of the upper chord and the lower ends of the lower chord are connected to the connecting angle steel; the arch frame, upper chord and lower chord are two groups, which are symmetrically arranged on both sides of the beam, and a "T"-shaped connecting bracket is fixed above the upper beam. The "T"-shaped connecting bracket includes horizontal struts and vertical struts that are perpendicular to each other. The two ends of the horizontal struts are respectively connected to the two groups of upper chords, the upper ends of the vertical struts are connected to the horizontal struts, and the lower ends are connected to the upper beam. The upper ends of the columns are connected to the lower beam, the lower ends of the columns are set on the column base, and the lower ends of the arch frame are set on the roof base.

[0006] Furthermore, the crossbeam also includes a crossbeam angle steel brace, which is arranged between the upper crossbeam and the lower crossbeam. The upper crossbeam and the lower crossbeam are both provided with crossbeam steel plates, and the crossbeam steel plates have four crossbeam steel plate holes at the four corners, and crossbeam bolts are arranged in the crossbeam steel plate holes.

[0007] Furthermore, the web is provided with web holes, the connecting angle is provided with angle holes, and the web and the connecting angle are fastened and connected via the web holes, the arch bolts and the angle holes.

[0008] Furthermore, an upper end plate is provided at the upper end of the column, and four column upper end steel plate holes are respectively provided at the four corners of the upper end plate. The upper end plate is connected to the lower crossbeam through the column upper end steel plate holes and the column U-shaped bolts.

[0009] Furthermore, a lower end plate is provided at the lower end of the column, and the column base includes a column base steel plate, a column base steel bar, a base screw and a column concrete foundation; the column base steel plate and the column base steel bar are arranged in the column concrete foundation, the column base steel bar is arranged below the column base steel plate, and the lower end plate is arranged above the column concrete foundation, and the lower end plate and the column base steel plate are connected by a base screw.

[0010] Furthermore, the roof base includes a roof base steel plate, a roof base steel bar and a roof concrete foundation; the roof base steel plate is arranged on the roof concrete foundation, the roof base steel bar is arranged below the roof base steel plate and is located in the roof concrete foundation, and the lower end of the arch frame is arranged on the roof base steel plate.

[0011] Furthermore, a roof arch web is arranged between the upper chord and the lower chord, and bracket steel plates are arranged obliquely at both ends of the horizontal support rod. Four bracket steel plate holes are arranged at the four corners of the bracket steel plate, and the bracket steel plate is connected to the upper chord through the bracket steel plate holes and the connecting bracket U-bolts.

[0012] A method for rebuilding a modified large-span plastic greenhouse based on a solar greenhouse arch frame is special in that the method comprises the following steps:

[0013] 1) Processing and preparation of standard parts for reconstruction, including preparation of beams, connecting angle steels, "T"-shaped connecting brackets, columns, column bases and roof bases;

[0014] 2) Assessment of the quality of solar greenhouse roof arches: For solar greenhouses that need to be dismantled and rebuilt, the quality of the roof arches should be assessed, and the rust, deformation, and damage of the arches should be checked. Solar greenhouses that are in good condition and meet the strength standards should be used for reconstruction;

[0015] 3) Non-destructive disassembly of the solar greenhouse roof arch frame,

[0016] 3.1) Remove the enclosure materials of the front and rear roofs.

[0017] 3.2) Remove the card slot, film rolling rod and anti-pocket water net,

[0018] 3.3) Cut and remove all longitudinal tie rods,

[0019] 3.4) Cut and separate the single arch frame from the foundation;

[0020] 4) Site selection and design of plastic greenhouses,

[0021] Choose a plot with good drainage, sufficient sunlight, and away from main traffic roads and dusty areas. Determine the appropriate lighting roof angle and plastic greenhouse height-span ratio based on the cultivation purpose and geographical location, and draw construction drawings based on the size of the solar greenhouse roof arch.

[0022] 5) Reconstruction of the roof arch structure of the solar greenhouse,

[0023] The rear roof is cut according to the determined lighting roof angle. The dihedral angle between the cutting plane and the front roof is complementary to the lighting roof angle. Angle steel is fixed vertically at the cutting position of the rear roof and horizontally at the cutting position of the front roof.

[0024] 6) Plastic greenhouse infrastructure construction,

[0025] 6.1) Level the target plot,

[0026] 6.2) Lofting according to the construction drawings,

[0027] 6.3) Cast reinforced concrete foundations. The depth of each column and arch reinforced concrete foundation is 400mm, and the horizontal dimension is 200mm. The column reinforced concrete foundations are pre-embedded with the column base, and the roof reinforced concrete foundations are pre-embedded with the roof base.

[0028] 7) Assembly and debugging of plastic greenhouses.

[0029] Furthermore, the specific steps of step 1) are as follows:

[0030] Preparation of crossbeams: The crossbeams are truss structures, including upper crossbeams, lower crossbeams, and web members. The upper crossbeams, lower crossbeams, and web members are all made of 100*100*3 hot-dip galvanized square steel tubes. The spacing between each web member is 1000mm, and the spacing between the upper and lower crossbeams is 400mm. "V"-shaped 50*3 angle steel braces are reinforced between the web members. The crossbeams are divided into sections of 6000mm each, and each section of the crossbeam contains six web members, arranged 100mm from one end and open at the other end. The crossbeam steel plates are fixed at both ends of the upper and lower crossbeams. The crossbeam steel plates are 170*170*5 hot-dip galvanized steel plates. Four crossbeam steel plate holes are drilled at the four corners of the crossbeam steel plate. Two crossbeam web member holes are drilled.

[0031] Prepare the connecting angle steel: Use 50*4 hot-dip galvanized angle steel, drill two holes in the longitudinal direction of the connecting angle steel, and the length of the connecting angle steel is 400mm;

[0032] Prepare a "T"-shaped connecting bracket: The "T"-shaped connecting bracket includes a horizontal brace and a vertical brace. The horizontal brace and the vertical brace are made of 40*40 hot-dip galvanized square steel pipes and fixed into a "T" shape. The two ends of the horizontal brace are tilted to fix the bracket steel plate. The bracket steel plate is a 50*110*3 hot-dip galvanized steel plate. Four bracket steel plate holes are drilled on the bracket steel plate.

[0033] Prepare the columns: Use φ80*4 hot-dip galvanized round steel pipes for the columns. Fix the upper end plate of the column, which is a 190*190*8 hot-dip galvanized steel plate. Fix the lower end plate of the column, which is a 180*180*8 hot-dip galvanized steel plate. Drill four holes on the upper and lower end plates respectively.

[0034] Prepare the column base: The column base includes a column base steel plate, column base steel bars and φ16 base screws. The column base steel bars are bent into a "J" shape, with the two ends bent outward to form hooks. The column base steel plate is a 180*180*8 hot-dip galvanized steel plate, and the column base steel bars are φ10 threaded steel bars.

[0035] Preparation of roof base: The roof base includes roof base steel plate and roof base steel bar. The roof base steel bar is bent into a "J" shape, with the two ends bent outward to form hooks. The roof base steel plate is 100*200*5 hot-dip galvanized steel plate, and the roof base steel bar is φ10 threaded steel bar.

[0036] The two holes of the web are φ22mm, with a spacing of 200mm; the two holes of the connecting angle are φ22mm, with a spacing of 200mm; the four holes of the bracket steel plate are φ10mm, arranged in a matrix, with the long side of the matrix being 32mm and the short side being 20mm; the four holes of the upper end plate of the column are φ20mm, arranged in a matrix, with the long side of the matrix being 140mm and the short side being 120mm; the four holes of the lower end plate are φ18mm, arranged in a matrix, with a matrix side length of 130mm. m; the column base steel bars and base screws are fixed on both sides of the column base steel plate respectively. There are two column base steel bars, arranged in parallel, and four base screws, with specifications of φ18*70, arranged in a matrix with a matrix side length of 130mm; the roof base steel bars are fixed on one side of the roof base steel plate, with a total of two, arranged in parallel; the inclination angle of the bracket steel plate, the length of the horizontal support rod and the vertical support rod, and the length of the column are determined according to the specific roof arch frame to be rebuilt; after the processing of the standard parts is completed, the processed parts are re-hot-dip galvanized.

[0037] Furthermore, the specific steps of step 7) are as follows:

[0038] 7.1) Install and fix the roof and columns. Use bolts to fix the columns to the column base;

[0039] 7.2) Lift the crossbeams and connect and secure them. Connect two crossbeam sections end to end and secure them with bolts to form a rigid whole. The ends of the crossbeams are fixed to the roof with crossbeam bolts, and the lower crossbeam is fixed to the columns with U-shaped bolts.

[0040] 7.3) Hoist the roof arches on both sides of the beams, and securely connect the connecting angle steels on the roof arches to the web members on the beams using arch bolts. Secure the ground-contacting end of the roof arches to the arch base.

[0041] 7.4) Install the "T"-shaped connecting brackets. Connect the ends of the horizontal braces to the upper chord of the roof arch using U-bolts from the connecting brackets. Secure the lower ends of the vertical braces to the upper crossbeams. Secure the ends of the horizontal braces to the turning points of the front and rear roof arch upper chords, ensuring that the horizontal braces are at the same height as the highest point of the arch.

[0042] 7.5) Install the longitudinal tie rods, slots and diagonal braces, and secure them with "U"-shaped buckles;

[0043] 7.6) Carry out rust-proof treatment on bolt joints and grounding foundation;

[0044] 7.7) Install the plastic film, insect net, water-proof net, film roll machine and film pressing line. The plastic film, insect net and water-proof net are fixed to the arch frame through the slots, and the film pressing line is fixed to the embedded foundation;

[0045] 7.8) Install a thermal blanket and roller shutter according to the design requirements of the plastic greenhouse. The upper end of the thermal blanket should be fixed on the horizontal support rod.

[0046] 7.9) Install other environmental control equipment and crop cultivation equipment according to production needs.

[0047] The present invention provides a modified large-span plastic greenhouse based on a solar greenhouse arch frame. The roof arch frames on both sides are connected by crossbeams and supported by columns. The construction and assembly are convenient, forming a rigid structure as a whole, improving the overall strength and load-bearing capacity of the plastic greenhouse. The arch frame is further fixed by a "T"-shaped connecting bracket set on the upper crossbeam. The horizontal support rods and vertical support rods can well transfer the roof load to the crossbeam, disperse the local load, and further improve the load-bearing capacity of the plastic greenhouse. The structural connection form of the present invention is suitable for the use of abandoned solar greenhouse roof arch frames, which can realize the reuse of abandoned arch frames. The horizontal support rod of the present invention is flush with the highest point of the roof arch frame upper chord rod, that is, the two ends of the horizontal support rod are fixed at the turning point of the roof arch frame upper chord rod, so that the horizontal support rod is at the same height as the highest point of the arch frame, which is convenient for laying plastic greenhouse film. The horizontal support rods, vertical support rods and the rear roof of the solar greenhouse form a double triangle structure, which is the most stable structure, and the stability of the plastic greenhouse is further enhanced. The lower chords of each roof arch are fixed with a number of longitudinal tie rods, which extend along the length of the greenhouse. All the arches are connected by the longitudinal tie rods to form a stable whole. The present invention arranges the crossbeam into several sections, and each section of the crossbeam is connected by bolts, which facilitates the selection of the corresponding number of sections according to the size of the site during reconstruction, improves versatility, and facilitates transportation and hoisting installation. A column is fixed to each crossbeam, which not only ensures the stability of the plastic greenhouse structure, but also reduces the number of columns and facilitates mechanized operation. The column structure of the present invention is simple, which reduces the cost of greenhouse reconstruction. The base structure is firm, which improves the reliability of column fixation. By arranging base screws on the column base steel plate, the installation and fixation of the column is facilitated, and the reconstruction construction efficiency is improved. The present invention uses angle steel as a connecting piece, and utilizes the two wing plates of the angle steel to connect with the web and the arch respectively, which facilitates the connection operation, and conveniently increases the contact area between the arch and the connecting piece, thereby improving the firmness of the connection.

[0048] The assembly and debugging method of the present invention is simple to operate and utilizes standard connectors for connection and fixation, further reducing the construction cost of the plastic greenhouse, facilitating installation, and extending its service life. The provision of a "T"-shaped connecting bracket forms a triangular structure at the top connection of the arch frame, thereby improving the overall stability and load-bearing capacity of the plastic greenhouse. The method of the present invention utilizes discarded solar greenhouse frames that are in good condition, have a scientific structure, and meet strength standards to reconstruct a large-span plastic greenhouse. This method is reasonable and feasible, not only recycling the solar greenhouse arch frame materials and reducing the cost of upgrading and renovating the solar greenhouse, but also reducing the construction cost of large-span plastic greenhouses, thereby increasing farmers' enthusiasm for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a cross-sectional view of the present invention;

[0050] Figure 2 It is a schematic diagram of the crossbeam structure of the present invention;

[0051] Figure 3 This is a schematic diagram of the connection between the crossbeam and the roof arch frame of the present invention;

[0052] Figure 4 This is a schematic diagram of the connection between the "T"-shaped connecting bracket and the roof arch frame of the present invention;

[0053] Figure 5 This is a schematic diagram of the connection between the beam and the column of the present invention;

[0054] Figure 6 This is a schematic diagram of the connection between the column and the column base of the present invention;

[0055] Figure 7 It is a schematic diagram of the connection between the arch frame and the roof base of the present invention.

[0056] The following are the descriptions of the reference numerals:

[0057] 1. Upper crossbeam; 2. Crossbeam steel plate; 3. Crossbeam bolts; 4. Crossbeam angle brace; 5. Lower crossbeam; 6. Crossbeam steel plate holes; 7. Web member holes; 8. Web member; 9. Upper chord; 10. Connecting angle steel; 11. Arch bolts; 12. Lower chord; 13. Angle steel holes; 14. Crossbeam; 15. Roof arch web member; 16. Roof arch; 17. Bracket steel plate; 18. Horizontal brace; 19. Connecting bracket U-bolts; 20. Bracket steel plate holes ; 21. Vertical support rod; 22. U-shaped bolt of column; 23. Upper end plate; 24. Column; 25. Hole of steel plate at upper end of column; 26. Lower end plate; 27. Steel plate of column base; 28. Steel bar of column base; 29. ​​Concrete foundation of column; 30. Steel plate of roof base; 31. Steel bar of roof base; 32. Concrete foundation of roof; 33. Base screw; 34. Base of column; 35. "T"-shaped connecting bracket; 36. Arch frame; 37. Roof base. DETAILED DESCRIPTION

[0058] The overall scheme of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0059] See also Figures 1 to 3The structure of the specific embodiment of the present invention includes a crossbeam 14, a roof arch 16 and a column 24. The crossbeam is a truss structure, and the crossbeam includes an upper crossbeam 1 and a lower crossbeam 5 fixed together, as well as a web member 8 fixed to the upper and lower crossbeams, and a crossbeam angle steel brace 4. The truss structure enables the crossbeam to withstand a larger load and at the same time evenly distributes the roof load to other arches and columns 24. The roof arch 16 includes an arch 36, an upper chord 9 and a lower chord 12 that are arranged obliquely and parallel to each other. A roof arch web 14 is provided between the upper and lower chords. The upper chord 9 and the lower chord 12 are respectively fixed with connecting angles 10. There are two connecting angles 10, which are respectively arranged on both sides of the upper crossbeam 1 and the lower crossbeam 5 and connected to the upper crossbeam 1 and the lower crossbeam 5. Angle holes 13 are provided on the connecting angles 10, and web holes 7 are provided on the web 8. The connecting angles 10 and the web 8 are fastened together via the angle holes 13, arch bolts 11, and web holes 7. The upper crossbeam 1 and the lower crossbeam 5 are both provided with crossbeam steel plates 2. The crossbeam steel plates 2 have four crossbeam steel plate holes 6 at their four corners. Crossbeam bolts 3 are provided in the crossbeam steel plate holes 6. The ends of the crossbeam 14 are fixed to the roof via the crossbeam bolts 3.

[0060] The angle steel 10 is used to connect the roof arch frame 16 and the cross beam 14, which is convenient for construction and assembly, forming a rigid structure as a whole, thereby improving the overall strength and load resistance of the plastic greenhouse.

[0061] A "T"-shaped connecting bracket 35 is fixed to the upper crossbeam 1. The "T"-shaped connecting bracket 35 includes a horizontal strut 18 whose two ends are respectively fixed to the two roof arches 16, and a vertical strut 21 whose upper end is fixed to the horizontal strut 18. The lower end of the vertical strut 21 is fixed to the upper crossbeam 1. The horizontal strut 18 and the vertical strut 21 can well transfer the roof load to the crossbeam, disperse the local load, and improve the load resistance of the plastic greenhouse. The two ends of the horizontal strut 18 are fixed at the turning point of the upper chord 9 of the roof arch, so that the horizontal strut 18 is flush with the highest point of the upper chord 9 of the roof arch 16, which is convenient for laying the plastic greenhouse film. The lower end of the vertical strut 21 is fixed to the upper crossbeam 1. The horizontal strut 18, the vertical strut 21 and the rear roof of the solar greenhouse form a double triangle structure, which is the most stable structure, and the plastic greenhouse has strong stability.

[0062] The present invention also includes several longitudinal tie rods fixed to the bottom chords of each roof arch. These tie rods extend along the length of the greenhouse. Two longitudinal tie rods are symmetrically fixed to the lower portion of the horizontal struts 18, and multiple longitudinal tie rods are symmetrically fixed to the bottom chords 12 of the roof arches 16. The longitudinal tie rods connect all the arches, forming a stable whole.

[0063] The crossbeam 14 consists of several sections, connected by bolts. Each section is secured with a column 24. The arches of a large-span plastic greenhouse are spaced 1 meter apart, with a column 24 installed every five arches. These columns 24 are fixed to the lower crossbeam 1. The columns 24 are fixed to the crossbeam 14 at the center of each small crossbeam section, ensuring structural stability while reducing the number of columns 24 and facilitating mechanized operation.

[0064] See also Figure 4 The two ends of the horizontal support rod 18 are inclined with a bracket steel plate 17, and four bracket steel plate holes 20 are set at the four corners of the bracket steel plate 17. The bracket steel plate 17 is connected to the upper chord rod 9 through the bracket steel plate holes 20 and the connecting bracket U-bolts 19.

[0065] See also Figure 5 The column 24 includes a column body, and an upper end plate 23 and a lower end plate 26 fixed to the two ends of the column body. Four column upper end steel plate holes 25 are respectively set at the four corners of the upper end plate 23. The upper end plate 23 is connected to the lower crossbeam 5 through the column upper end steel plate holes 25 and the column U-shaped bolts 22.

[0066] See also Figure 6 The lower end plate 26 is fixedly connected to the column base 34, and the column base includes a column base steel plate 27, a column base steel bar 28, a base screw 33 and a column concrete foundation 29; the column base steel plate 27 and the column base steel bar 28 are arranged in the column concrete foundation 29, the column base steel bar 28 is arranged below the column base steel plate 27, and the lower end plate 26 is arranged above the column concrete foundation, and the column base steel plate 27 is fixed with a base screw 33 that vertically passes through the lower end plate 26.

[0067] See also Figure 7 The roof base 37 includes a roof base steel plate 30, a roof base steel bar 31 and a roof concrete foundation 32; the roof base steel plate 30 is arranged on the roof concrete foundation 32, the roof base steel bar 31 is arranged below the roof base steel plate 30 and is located in the roof concrete foundation 32, and the lower end of the arch frame 36 is arranged on the roof base steel plate 30.

[0068] Utilizing the original arch frame slot structure, the plastic greenhouse is equipped with two side vents and two top vents; insect-proof nets are installed on the side vents, and insect-proof nets and water-proof nets are installed on the top vents. Utilizing the original top vents and side vents, the ventilation needs of the plastic greenhouse are met. The insect-proof nets and water-proof nets can reduce the occurrence of diseases and pests in the plastic greenhouse. According to production needs, a thermal insulation blanket can be added. The use of the thermal insulation blanket enables the plastic greenhouse to have the ability to produce low-temperature resistant leafy vegetables in winter.

[0069] The present invention also provides a method for converting a solar greenhouse into a large-span plastic greenhouse, comprising the following steps:

[0070] 1) Reconstruction of standard parts processing and preparation:

[0071] Preparation of crossbeam 14: crossbeam 14 is a truss structure, including an upper crossbeam 1, a lower crossbeam 5 and a web member 8. The upper crossbeam 1, the lower crossbeam 5 and the web member 8 are all made of 100*100*3 hot-dip galvanized square steel tubes. The spacing between each web member 8 is 1000mm, and the spacing between the upper crossbeam 1 and the lower crossbeam 5 is 400mm. "V"-shaped 50*3 angle steel braces 4 are reinforced between the web members 8; the crossbeam is divided into sections of 6000mm, and each section of the crossbeam 14 contains six web members 8, which are arranged 100mm from one end and open at the other end; the crossbeam steel plate 2 is fixed at both ends of the upper crossbeam 1 and the lower crossbeam 5. The crossbeam steel plate 2 is a 170*170*5 hot-dip galvanized steel plate. Four crossbeam steel plate holes 6 are drilled at the four corners of the crossbeam steel plate 2; two web member holes 7 are drilled in the web member 8.

[0072] Preparation of the connecting angle steel 10: The connecting angle steel 10 uses 50*4 hot-dip galvanized angle steel, and two angle steel holes 13 are drilled in the longitudinal direction of the connecting angle steel 10. The length of the connecting angle steel 10 is 400 mm.

[0073] Prepare a "T"-shaped connecting bracket 35: The "T"-shaped connecting bracket 35 includes a horizontal support rod 18 and a vertical support rod 21. The horizontal support rod 18 and the vertical support rod 21 are made of 40*40 hot-dip galvanized square steel pipes and fixed into a "T" shape. The two ends of the horizontal support rod 18 are tilted to fix the support steel plate 17. The support steel plate 17 is a 50*110*3 hot-dip galvanized steel plate. Four support steel plate holes 20 are drilled on the support steel plate 17.

[0074] Prepare column 24: Column 24 is made of φ80*4 hot-dip galvanized round steel pipe. The upper end of column 24 is fixed with upper end plate 23, which is 190*190*8 hot-dip galvanized steel plate. The lower end is fixed with lower end plate 26, which is 180*180*8 hot-dip galvanized steel plate. Four holes are drilled on the upper end plate 23 and the lower end plate 26 respectively.

[0075] Prepare the column base 34: The column base 34 includes a column base steel plate 27, a column base steel bar 28 and a φ16 base screw 33. The column base steel bar 28 is bent into a "J" shape, and the two ends are bent outward to form a hook. The column base steel plate 27 is a 180*180*8 hot-dip galvanized steel plate, and the column base steel bar 28 is a φ10 threaded steel bar.

[0076] Prepare the roof base 37: The roof base 37 includes a roof base steel plate 30 and a roof base steel bar 31. The roof base steel bar 31 is bent into a "J" shape, and the two ends are bent outward to form hooks; the roof base steel plate 30 is a 100*200*5 hot-dip galvanized steel plate, and the roof base steel bar 31 is a φ10 threaded steel bar.

[0077] The two web holes 7 of the crossbeam web 8 are φ22mm with a spacing of 200mm; the two angle steel holes 13 of the connecting angle steel 10 are φ22mm with a spacing of 200mm; the four bracket steel plate holes 20 of the bracket steel plate 17 are φ10mm, arranged in a matrix, with the long side of the matrix being 32mm and the short side being 20mm; the four column upper end steel plate holes 25 of the upper end plate 23 of the column 24 are φ20mm, arranged in a matrix, with the long side of the matrix being 140mm and the short side being 1 The four holes in the lower end plate 26 are φ18mm and arranged in a matrix with a side length of 130mm. The column base steel bars 28 and base screws 33 are fixed to either side of the column base steel plate 27. There are two column base steel bars 28 arranged in parallel, and four base screws 33, measuring φ18*70, are arranged in a matrix with a side length of 130mm. The roof base steel bars 31 are fixed to one side of the roof base steel plate 30. There are two roof base steel bars 31 arranged in parallel. The inclination angle of the bracket steel plate 17, the length of the horizontal braces 18 and vertical braces 21, and the length of the columns 24 are determined according to the specific roof arch reconstruction. After processing, the standard parts are re-hot-dip galvanized.

[0078] 2) Assessment of the quality of the roof arches of solar greenhouses. For solar greenhouses that need to be demolished and rebuilt, the quality of the roof arches should be assessed, and the rust, deformation and damage of the arches should be checked. Solar greenhouses that are in good condition, have scientific structures and meet the strength standards should be used for reconstruction.

[0079] 3) The non-destructive disassembly of the solar greenhouse roof arch frame is as follows: the first step is to remove the enclosure materials of the front and rear roofs; the second step is to remove the card slots, film roll rods and anti-water nets; the third step is to cut and remove all longitudinal tie rods; the fourth step is to separate the single arch frame from the foundation by cutting. The disassembly process should avoid causing secondary deformation of the arch frame.

[0080] 4) Site selection and design of plastic greenhouses: choose a plot with good drainage, sufficient light, and away from main traffic roads and dust areas. Determine the appropriate lighting roof angle and height-to-span ratio of the plastic greenhouse based on the cultivation purpose and geographical location, and draw construction drawings based on the size of the solar greenhouse roof arch.

[0081] The personnel who select the site and draw the construction drawings should fully understand the structural characteristics of the roof arch of the pre-renovated solar greenhouse and the environmental characteristics of the site. They should be able to determine the inclination angle of the bracket steel plate 17, the length of the horizontal support rod 18 and the vertical support rod 21 and the length of the column 24 according to the specific situation, and be able to add additional reinforcement structure for the plastic greenhouse.

[0082] 5) Reconstruction of the arch structure of the solar greenhouse roof. Cut the rear roof according to the determined lighting roof angle. The dihedral angle between the cutting plane and the front roof is complementary to the lighting roof angle. Fix the angle steel vertically at the cutting position of the rear roof and fix the angle steel horizontally at the cutting position of the front roof.

[0083] 6) Plastic greenhouse foundation construction: the first step is to level the target plot, the second step is to lay out according to the construction drawings, and the third step is to pour the reinforced concrete foundation. The depth of each column concrete foundation 29 and roof concrete foundation 32 is 400 mm, and the horizontal dimension is 200 mm. The column reinforced concrete foundation has an embedded column base 34, and the roof reinforced concrete foundation has an embedded roof base 37.

[0084] The column base steel plate 27 is located inside the column concrete foundation 29, and the upper base screw 33 is 30 mm higher than the surface of the column concrete foundation 29; the roof base steel plate 30 is located on the surface of the roof concrete foundation 32; the surfaces of the column concrete foundation 29 and the roof concrete foundation 32 are on the same horizontal plane; the distance between each column concrete foundation 29 is 6000 mm, and the distance between each roof concrete foundation 32 is 1000 mm.

[0085] 7) Plastic greenhouse assembly and debugging:

[0086] 7.1) Install and fix the roof and columns 24. The columns 24 are fixed to the column base 34 using base screws 33;

[0087] 7.2) Lift and secure the crossbeams 14. Connect two sections of the crossbeam 14 end to end and secure them with bolts to form a rigid whole. Secure the ends of the crossbeam 14 to the roof with crossbeam bolts 3, and secure the lower crossbeam 5 to the columns 24 with column U-bolts 22.

[0088] 7.3) Install the roof arches 16 on both sides of the crossbeam 14. Bolt the connecting angle steels 10 on the roof arches 16 and the web members 8 on the crossbeam 14 with the arch bolts 11. Fix the ground-contacting ends of the roof arches 16 to the roof base 37.

[0089] 7.4) Install the "T"-shaped connecting bracket 35. Connect the ends of the horizontal brace 18 to the upper chord 9 via the connecting bracket U-bolts 19. Secure the lower ends of the vertical brace 21 to the upper crossbeam 1. Secure the ends of the horizontal brace 18 to the turning point of the front and rear upper chords 9, ensuring that the horizontal brace 18 is at the same height as the highest point of the roof arch 16.

[0090] 7.5) Install the longitudinal tie rods, slots and diagonal braces, and secure them with "U"-shaped buckles;

[0091] 7.6) Carry out rust-proof treatment on bolt joints and grounding foundation;

[0092] 7.7) Install the plastic film, insect net, water-proof net, film roll machine and film pressing line. The plastic film, insect net and water-proof net are fixed to the arch frame through the slots, and the film pressing line is fixed to the embedded foundation;

[0093] 7.8) Install a thermal blanket and roller shutter according to the design requirements of the plastic greenhouse. The upper end of the thermal blanket is fixed to the horizontal support rod 18;

[0094] 7.9) Install other environmental control equipment and crop cultivation equipment according to production needs.

[0095] 8) Check the construction status of plastic greenhouses and accept qualified plastic greenhouses.

[0096] 9) Complete the renovation work.

[0097] The above are only specific embodiments disclosed in the present invention, but the protection scope disclosed in the present invention is not limited thereto. The protection scope disclosed in the present invention shall be based on the protection scope of the claims.

[0098] The content of the present invention and the technical content not specifically described in the above embodiments are the same as the prior art.

[0099] The present invention is not limited to the above embodiments, and all of the contents of the present invention can be implemented and have the above good effects.

Claims

1. A modified large-span plastic greenhouse based on a solar greenhouse arch frame, characterized by: The modified large-span plastic greenhouse based on the solar greenhouse arch frame includes a crossbeam, a roof arch frame and a column. The crossbeam is a truss structure. The crossbeam includes an upper crossbeam, a lower crossbeam, a connecting angle steel and a web bar that fixes the upper crossbeam and the lower crossbeam. There are two connecting angle steels, which are respectively arranged on both sides of the upper crossbeam and the lower crossbeam, and connected to the upper crossbeam and the lower crossbeam. The roof arch frame includes an arch frame, an upper chord and a lower chord arranged inclined and parallel, the upper ends of the upper chord and the lower chord are connected to the upper end of the arch frame, and the lower ends of the upper chord and the lower chord are connected to the connecting angle steel; the arch frame, the upper chord and the lower chord are two groups, which are symmetrically arranged on both sides of the crossbeam, and a "T"-shaped connecting bracket is fixed above the upper crossbeam, and the "T"-shaped connecting bracket includes a horizontal strut and a vertical strut that are perpendicular to each other, and the two ends of the horizontal strut are respectively connected to the two groups of upper chords, and the vertical struts The upper end is connected to the horizontal support rod, and the lower end is connected to the upper cross beam. The upper end of the column is connected to the lower cross beam, the lower end of the column is arranged on the column base, and the lower end of the arch frame is arranged on the roof base; the horizontal support rod is flush with the highest point of the roof arch frame upper chord, that is, both ends of the horizontal support rod are fixed at the turning point of the roof arch frame upper chord, so that the horizontal support rod and the highest point of the arch frame are at the same height. The horizontal support rod, vertical support rod and the rear roof of the solar greenhouse form a double triangle structure, and each roof arch frame lower chord is fixed to a number of longitudinal pull rods, and the longitudinal pull rods extend along the length direction of the greenhouse, and all arch frames are connected by the longitudinal pull rods, and a roof arch frame web is arranged between the upper chord and the lower chord, and bracket steel plates are obliquely arranged at both ends of the horizontal support rod, and four bracket steel plate holes are arranged at the four corners of the bracket steel plate, and the bracket steel plate is connected to the upper chord through the bracket steel plate holes and the connecting bracket U-bolts.

2. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 1 is characterized in that: The crossbeam also includes a crossbeam angle steel brace, which is arranged between the upper crossbeam and the lower crossbeam. The upper crossbeam and the lower crossbeam are both provided with crossbeam steel plates, and the crossbeam steel plates have four crossbeam steel plate holes at the four corners, and crossbeam bolts are arranged in the crossbeam steel plate holes.

3. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 2 is characterized in that: The web is provided with web holes, the connecting angle is provided with angle holes, and the web and the connecting angle are fastened and connected via the web holes, the arch bolts and the angle holes.

4. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 3 is characterized in that: An upper end plate is provided at the upper end of the column, and four column upper end steel plate holes are respectively provided at the four corners of the upper end plate. The upper end plate is connected to the lower crossbeam through the column upper end steel plate holes and the column U-shaped bolts.

5. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 4 is characterized in that: A lower end plate is provided at the lower end of the column, and the column base includes a column base steel plate, a column base steel bar, a base screw and a column concrete foundation; the column base steel plate and the column base steel bar are arranged in the column concrete foundation, the column base steel bar is arranged below the column base steel plate, and the lower end plate is arranged above the column concrete foundation, and the lower end plate and the column base steel plate are connected by a base screw.

6. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 5 is characterized in that: The roof base includes a roof base steel plate, roof base steel bars and a roof concrete foundation; the roof base steel plate is arranged on the roof concrete foundation, the roof base steel bars are arranged below the roof base steel plate and located in the roof concrete foundation, and the lower end of the arch frame is arranged on the roof base steel plate.

7. A method for rebuilding a large-span plastic greenhouse based on a solar greenhouse arch frame according to claim 1, characterized in that: The method comprises the following steps: 1) Processing and preparation of standard parts for reconstruction, including preparation of beams, connecting angle steels, "T"-shaped connecting brackets, columns, column bases and roof bases; 2) Assessment of the quality of solar greenhouse roof arches: For solar greenhouses that need to be dismantled and rebuilt, the quality of the roof arches should be assessed, and the rust, deformation, and damage of the arches should be checked. Solar greenhouses that are in good condition and meet the strength standards should be used for reconstruction; 3) Non-destructive dismantling of solar greenhouse roof arches, 3.1) Remove the enclosure materials of the front and rear roofs. 3.2) Remove the card slot, film rolling rod and anti-pocket water net, 3.3) Cut and remove all longitudinal tie rods, 3.4) Cut and separate the single arch frame from the foundation; 4) Site selection and design of plastic greenhouses, Choose a plot with good drainage, sufficient sunlight, and away from main traffic roads and dusty areas. Determine the appropriate lighting roof angle and plastic greenhouse height-span ratio based on the cultivation purpose and geographical location, and draw construction drawings based on the size of the solar greenhouse roof arch. 5) Reconstruction of the roof arch structure of the solar greenhouse, The rear roof is cut according to the determined lighting roof angle. The dihedral angle between the cutting plane and the front roof is complementary to the lighting roof angle. Angle steel is fixed vertically at the cutting position of the rear roof and horizontally at the cutting position of the front roof. 6) Plastic greenhouse infrastructure construction, 6.1) Level the target plot, 6.2) Lofting according to the construction drawings, 6.3) Cast reinforced concrete foundations. The depth of each column and arch reinforced concrete foundation is 400mm, and the horizontal dimension is 200mm. The column reinforced concrete foundations are pre-embedded with the column base, and the roof reinforced concrete foundations are pre-embedded with the roof base. 7) Plastic greenhouse assembly and debugging; 7.1) Install and fix the roof and columns. Use bolts to fix the columns to the column base; 7.2) Lift the crossbeams and connect and secure them. Connect two crossbeam sections end to end and secure them with bolts to form a rigid whole. The ends of the crossbeams are fixed to the roof with crossbeam bolts, and the lower crossbeam is fixed to the columns with U-shaped bolts. 7.3) Hoist the roof arches on both sides of the beams. Bolt the connecting angle steel on the roof arches to the web members on the beams using arch bolts. Fix the ground-contacting end of the roof arches to the arch base. 7.4) Install the "T"-shaped connecting brackets. Connect the ends of the horizontal braces to the upper chord of the roof arch using U-bolts from the connecting brackets. Secure the lower ends of the vertical braces to the upper crossbeams. Secure the ends of the horizontal braces to the turning points of the upper chords of the front and rear roof arches, ensuring that the horizontal braces are at the same height as the highest point of the arches. The horizontal braces, vertical braces, and the rear roof of the solar greenhouse form a double triangle structure. 7.5) Install the longitudinal tie rods, slots, and diagonal braces, securing them with "U"-shaped clips; 7.6) Carry out rust-proof treatment on bolt joints and grounding foundation; 7.7) Install the plastic film, insect-proof net, water-proof net, film roll machine, and film pressing line. The plastic film, insect-proof net, and water-proof net are fixed to the arch frame through the slots, and the film pressing line is fixed to the embedded foundation. 7.8) Install insulation blankets and roller shutters according to the design requirements of the plastic greenhouse. The upper end of the insulation blanket is fixed to the horizontal support rods. 7.9) Install other environmental control equipment and crop cultivation equipment according to production needs.

8. The method for rebuilding a modified large-span plastic greenhouse based on a solar greenhouse arch frame according to claim 7, characterized in that: The specific steps of step 1) are as follows: Prepare the crossbeams: The crossbeams are truss structures, including upper and lower crossbeams and web members. The upper and lower crossbeams and web members are all made of 100*100*3 hot-dip galvanized square steel tubes. The spacing between each web member is 1000mm, and the spacing between the upper and lower crossbeams is 400mm. "V"-shaped 50*3 angle steel braces are reinforced between the web members. The crossbeams are divided into sections of 6000mm each, and each section of the crossbeam contains six web members, arranged 100mm from one end and open at the other end. The crossbeam steel plates are fixed at both ends of the upper and lower crossbeams. The crossbeam steel plates are 170*170*5 hot-dip galvanized steel plates. Four holes are drilled in the four corners of the crossbeam steel plates. Two holes are drilled in the web members. Prepare the connecting angle steel: Use 50*4 hot-dip galvanized angle steel, drill two holes in the longitudinal direction of the connecting angle steel, and the length of the connecting angle steel is 400mm; Prepare a "T"-shaped connecting bracket: The "T"-shaped connecting bracket includes a horizontal brace and a vertical brace. The horizontal brace and the vertical brace are made of 40*40 hot-dip galvanized square steel pipes and fixed into a "T" shape. The two ends of the horizontal brace are tilted to fix the bracket steel plate. The bracket steel plate is a 50*110*3 hot-dip galvanized steel plate. Four bracket steel plate holes are drilled on the bracket steel plate. Prepare the columns: Use φ80*4 hot-dip galvanized round steel pipes for the columns. Fix the upper end plate of the column, which is a 190*190*8 hot-dip galvanized steel plate. Fix the lower end plate of the column, which is a 180*180*8 hot-dip galvanized steel plate. Drill four holes on the upper and lower end plates respectively. Prepare the column base: The column base includes a column base steel plate, column base steel bars and φ16 base screws. The column base steel bars are bent into a "J" shape, with the two ends bent outward to form hooks. The column base steel plate is a 180*180*8 hot-dip galvanized steel plate, and the column base steel bars are φ10 threaded steel bars. Prepare the roof base: The roof base includes the roof base steel plate and roof base steel bars. The roof base steel bars are bent into a "J" shape, with the two ends bent outward to form hooks. The roof base steel plate is a 100*200*5 hot-dip galvanized steel plate, and the roof base steel bars are φ10 threaded steel bars. The two holes of the web members are φ22mm, with a spacing of 200mm; the two holes of the connecting angle steel are φ22mm, with a spacing of 200mm; The four holes of the bracket steel plate are φ10mm, arranged in a matrix, with the long side of the matrix being 32mm and the short side being 20mm; the four holes of the upper end plate of the column are φ20mm, arranged in a matrix, with the long side of the matrix being 140mm and the short side being 120mm; the four holes of the lower end plate are φ18mm, arranged in a matrix, with the matrix side length being 130mm; the column base steel bars and base screws are fixed on both sides of the column base steel plate respectively, with two column base steel bars arranged in parallel, and four base screws in total, with a specification of φ18*70, arranged in a matrix, and the matrix side length being 130mm; the roof base steel bars are fixed on one side of the roof base steel plate, with a total of two, arranged in parallel; the inclination angle of the bracket steel plate, the length of the horizontal support rod and the vertical support rod and the length of the column are determined according to the specific reconstruction of the roof arch frame; the standard parts are re-hot-dip galvanized on the processed parts after processing is completed.

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