Modified large-span plastic greenhouse based on sunlight greenhouse arch frame and reconstruction method

Abstract

The modified large-span plastic greenhouse comprises cross beams, a roof arch frame and stand columns, the cross beams comprise an upper cross beam, a lower cross beam, two pieces of connecting angle steel and web members for fixedly connecting the upper cross beam and the lower cross beam, and the connecting angle steel is arranged on the two sides of the upper cross beam and the two sides of the lower cross beam respectively; the roof arch frame comprises an arch frame, an upper chord member and a lower chord member, the upper chord member and the lower chord member are obliquely arranged in parallel, the upper end of the upper chord member and the upper end of the lower chord member are connected with the upper end of the arch frame, and the lower end of the upper chord member and the lower end of the lower chord member are connected with the connecting angle steel; the arch frames, the upper chords and the lower chords are symmetrically arranged on the two sides of the cross beam, a T-shaped connecting support is fixedly connected to the upper portion of the upper cross beam and comprises a horizontal supporting rod and a vertical supporting rod which are perpendicularly connected, the two ends of the horizontal supporting rod are connected with the two sets of upper chords respectively, the upper end of the vertical supporting rod is connected with the horizontal supporting rod, and the lower end of the vertical supporting rod is connected with the upper cross beam. The upper end of the stand column is connected with the lower beam, and the lower end of the stand column is arranged on the stand column base. The device is simple in structure and complete in function, the waste sunlight greenhouse roof arch frame is recycled, the construction cost of a large-span plastic greenhouse is reduced, and the development of facility agriculture can be promoted.

Description

Technical Field

[0001] The 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 background of the continuous updating of new technologies, solar greenhouses have begun to be upgraded and renovated. Some intact roof arch frames have been abandoned due to span problems, 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 the construction cost has begun to increase 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 can recycle the abandoned solar greenhouse roof arch frame and reduce 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 a solar greenhouse arch frame, and its special features are: the modified large-span plastic greenhouse based on a solar greenhouse arch frame 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 bar that fixes the upper crossbeam and the lower crossbeam, the connecting angle steel is two, which are respectively arranged on both sides of the upper crossbeam and the lower crossbeam, and are connected to the upper crossbeam and the lower crossbeam, the roof arch frame includes an arch frame, an upper chord rod and a lower chord rod arranged in an inclined and parallel manner, and the upper chord rod 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 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 vertically connected 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 arranged on the column base, and the lower ends of the arch frame are arranged on the roof base.

[0006] Furthermore, the crossbeam also includes a crossbeam angle steel diagonal 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 four corners, and crossbeam bolts are arranged in the crossbeam steel plate holes.

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

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

[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, 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 frame web is arranged between the upper chord and the lower chord, support steel plates are obliquely arranged at both ends of the horizontal support rod, four support steel plate holes are arranged at the four corners of the support steel plate, and the support steel plate is connected to the upper chord through the support steel plate holes and the connecting support 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 reconstruction standard parts, including preparation of beams, connecting angle steels, "T"-shaped connecting brackets, columns, column bases and roof bases;

[0014] 2) Quality assessment of solar greenhouse roof arches: conduct quality assessment of solar greenhouse roof arches that need to be dismantled and rebuilt, check the rust, deformation and damage of the arches, and use solar greenhouses that are in good condition and meet the strength standards for reconstruction;

[0015] 3) Non-destructive dismantling of solar greenhouse roof arches,

[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] Select 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 frame.

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

[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, the angle steel is fixed vertically at the cutting position of the rear roof, and the angle steel is fixed 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 foundation. The depth of each column and arch reinforced concrete foundation is 400mm, and the horizontal dimension is 200mm. The column reinforced concrete foundation is pre-embedded with the column base, and the roof reinforced concrete foundation is pre-embedded with the roof base;

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

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

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

[0031] Preparation of connecting angle steel: The connecting angle steel adopts 50*4 hot-dip galvanized angle steel, and two angle steel holes are drilled in the longitudinal direction of the connecting angle steel. 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] Preparation of columns: The columns are made of φ80*4 hot-dip galvanized round steel pipes. The upper end plate is fixed on the upper end of the column. The upper end plate is a 190*190*8 hot-dip galvanized steel plate. The lower end plate is fixed on the lower end. The lower end plate is a 180*180*8 hot-dip galvanized steel plate. Four holes are drilled on the upper end plate and the lower end plate respectively.

[0034] Preparation of column base: The column base includes column base steel plate, column base steel bar and φ16 base screw. The column base steel bar is bent into a "J" shape, and the two ends are 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 bar is a φ10 threaded steel bar.

[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, and the two ends are 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 bar is a φ10 threaded steel bar.

[0036] The two holes of the web bars are φ22mm, with a spacing of 200mm; the two holes of the angle steel connecting the 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 steel 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 130m 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 reconstruction of the roof arch frame; after the processing of the standard parts is completed, the processed parts are re-hot-dip galvanized.

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

[0038] 7.1) Install and fix the shed head and columns. Fix the columns to the column base with bolts;

[0039] 7.2) Lift the beams to connect and fix them. Every two sections of the beams are connected end to end and fixed with bolts to form a rigid whole. The two ends of the beams are fixed to the top of the shed with beam bolts, and the lower beam is fixed to the column with column U-bolts.

[0040] 7.3) Hoist the roof arches on both sides of the beam, and fix the connecting angle steel on the roof arches with the web bars on the beams through the arch bolts, and fix the ground-contacting end of the roof arches on the arch base;

[0041] 7.4) Install the "T"-shaped connecting bracket. The two ends of the horizontal brace are connected to the upper chord of the roof arch through the U-shaped bolts of the connecting bracket. The lower end of the vertical brace is fixed to the upper beam. The two ends of the horizontal brace are fixed at the turning point of the upper chord of the front and rear roof arches, so that the horizontal brace is at the same height as the highest point of the arch.

[0042] 7.5) Install the longitudinal tie rod, slot and diagonal brace and fix them with "U"-shaped buckles;

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

[0044] 7.7) Install plastic shed film, insect-proof net, water-proof net, film rolling machine and film pressing line. The plastic shed film, insect-proof net and water-proof net are fixed on the arch frame through the card slot, and the film pressing line is fixed on the embedded foundation;

[0045] 7.8) Install the insulation blanket and roller shutter according to the design requirements of the plastic greenhouse, and fix the upper end of the insulation blanket on the horizontal support rod;

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

[0047] The 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 a crossbeam, and supported by columns. The construction and assembly are convenient, and a rigid structure is formed as a whole, which improves the overall strength and load resistance of the plastic greenhouse. The arch frame is further fixed by a "T"-shaped connecting bracket set on the upper crossbeam. The horizontal brace and the vertical brace can well transfer the roof load to the crossbeam, disperse the local load, and further improve the load resistance of the plastic greenhouse. The structural connection form of the invention is suitable for the use of abandoned solar greenhouse roof arch frames, and the reuse of the waste arch frames can be realized. The horizontal brace of the invention is flush with the highest point of the upper chord of the roof arch frame, that is, the two ends of the horizontal brace are fixed at the turning point of the upper chord of the roof arch frame, so that the horizontal brace is at the same height as the highest point of the arch frame, which is convenient for laying plastic greenhouse film. The horizontal brace, the vertical brace 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. A plurality of longitudinal tie rods are fixed to the lower chord of each roof arch frame, and the longitudinal tie rods extend along the length direction of the greenhouse. All the arch frames are connected by the longitudinal tie rods to form a stable whole. The present invention sets the crossbeam into a plurality of sections, and each section of the crossbeam is connected by bolts, which is convenient for selecting the corresponding number of sections according to the size of the site during reconstruction, improves versatility, and is convenient for transportation and hoisting installation. A column is fixed to each crossbeam section, 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, and the base structure is firm, which improves the reliability of column fixation. By arranging the base screw on the column base steel plate, the installation and fixation of the column is convenient, and the reconstruction construction efficiency is improved. The present invention uses angle steel as a connecting piece, and uses the two wing plates of the angle steel to be connected with the web bar and the arch frame respectively, which is convenient for connection operation, and convenient for increasing the contact area between the arch frame and the connecting piece, and improves the firmness of the connection.

[0048] The assembly and debugging method of the present invention is simple to operate, and is connected and fixed using standard connectors, which further reduces the construction cost of the plastic greenhouse, is easy to install, and has a long service life; the setting of the "T"-shaped connecting bracket forms a triangular structure at the top connection of the arch frame, which improves the overall stability and load resistance of the plastic greenhouse. The method of the present invention uses abandoned solar greenhouse frames with good appearance, scientific structure, and strength that meet standards to rebuild large-span plastic greenhouses. It is reasonable and feasible, not only recycles solar greenhouse arch frame materials and reduces the cost of upgrading and transforming solar greenhouses, but also reduces the construction cost of large-span plastic greenhouses, which is conducive to improving farmers' production enthusiasm. 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 It is a schematic diagram of the connection between the cross beam and the roof arch frame of the present invention;

[0052] Figure 4 It 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 It is a schematic diagram of the connection between the crossbeam and the column of the present invention;

[0054] Figure 6 It 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 steel diagonal brace; 5. Lower crossbeam; 6. Crossbeam steel plate holes; 7. Web rod holes; 8. Web rod; 9. Upper chord rod; 10. Connecting angle steel; 11. Arch bolts; 12. Lower chord rod; 13. Angle steel holes; 14. Crossbeam; 15. Roof arch web rod; 16. Roof arch; 17. Bracket steel plate; 18. Horizontal brace; 19. Connecting bracket U-bolts, 20. Bracket steel plate holes ; 21. Vertical strut; 22. U-bolts for columns; 23. Upper end plate; 24. Columns; 25. Holes in the upper steel plate of columns; 26. Lower end plate; 27. Steel plate for column base; 28. Steel bars for column base; 29. ​​Concrete foundation for columns; 30. Steel plate for roof base; 31. Steel bars for roof base; 32. Concrete foundation for roof; 33. Base screws; 34. Column base; 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 in conjunction with the accompanying drawings and specific embodiments:

[0059] See also Figures 1 to 3The structure of the specific embodiment of the present invention includes a cross beam 14, a roof arch 16 and a column 24. The cross beam is a truss structure. The cross beam includes an upper cross beam 1 and a lower cross beam 5 fixed together, as well as a web member 8 fixed to the upper cross beam and the lower cross beam, and a cross beam angle steel brace 4. The truss structure enables the cross beam 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 which are arranged obliquely and in parallel, a roof arch web 14 is arranged between the upper chord and the lower chord, the end of the upper chord 9 and the lower end of the lower chord 12 are respectively fixed with connecting angle steels 10, two connecting angle steels 10 are respectively arranged on both sides of the upper cross beam 1 and the lower cross beam 5, and connected to the upper cross beam 1 and the lower cross beam 5, angle steel holes 13 are arranged on the connecting angle steel 10, web rod holes 7 are arranged on the web rod 8, and the connecting angle steel 10 and the web rod 8 are fastened and connected through the angle steel holes 13, arch bolts 11 and web rod holes 7. The upper cross beam 1 and the lower cross beam 5 are both provided with cross beam steel plates 2, four cross beam steel plate holes 6 are arranged at the four corners of the cross beam steel plates 2, cross beam bolts 3 are arranged in the cross beam steel plate holes 6, and both ends of the cross beam 14 are fixed to the roof through the cross beam 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 fixedly connected 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 a plurality of longitudinal tie rods fixed to the lower chords of each roof arch, and the longitudinal tie rods extend along the length direction of the greenhouse. Two longitudinal tie rods are symmetrically fixed to the lower part of the horizontal support rod 18, and multiple longitudinal tie rods are symmetrically fixed to the lower chord 12 of the roof arch 16. The longitudinal tie rods connect all the arches to form a stable whole.

[0063] The cross beam 14 includes several sections, each of which is connected by bolts, and a column 24 is fixed to each cross beam 14. The arch spacing of the large-span plastic greenhouse is 1m, and a column 24 is set every five arch frames, and the column 24 is fixed on the lower cross beam 1. The fixing point of the column 24 and the cross beam 14 is located in the middle of each small section of the cross beam, which reduces the number of columns 24 while ensuring the stability of the plastic greenhouse structure, and facilitates mechanized operation.

[0064] See also Figure 4 The two ends of the horizontal support rod 18 are obliquely provided with a support steel plate 17 , and four support steel plate holes 20 are provided at the four corners of the support steel plate 17 . The support steel plate 17 is connected to the upper chord rod 9 through the support steel plate holes 20 and the connecting support 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 both ends of the column body. Four column upper end steel plate holes 25 are respectively arranged at the four corners of the upper end plate 23. The upper end plate 23 is connected to the lower cross beam 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 fixedly connected to the base screw 33 which vertically passes through the lower end plate 26 upward.

[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 at the side vents, and insect-proof nets and water-proof nets are installed at the top vents. Utilizing the original top 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 blanket can be added. The use of the thermal blanket enables the plastic greenhouse 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 cross beam 14: cross beam 14 is a truss structure, including an upper cross beam 1, a lower cross beam 5 and a web member 8. The upper cross beam 1, the lower cross beam 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 cross beam 1 and the lower cross beam 5 is 400mm. "V"-shaped 50*3 angle steel diagonal braces 4 are reinforced between the web members 8; the cross beam is divided into sections of every 6000mm, and each section of the cross beam 14 contains six web members 8, which are arranged from 100mm at one end and are open at the other end; cross beam steel plates 2 are fixed at both ends of the upper cross beam 1 and the lower cross beam 5. The cross beam steel plates 2 are 170*170*5 hot-dip galvanized steel plates. Four cross beam steel plate holes 6 are drilled at the four corners of the cross beam 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 a 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 and fixed to 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: φ80*4 hot-dip galvanized round steel pipe is used for column 24. The upper end plate 23 is fixed at the upper end of column 24. The upper end plate 23 is a 190*190*8 hot-dip galvanized steel plate. The lower end plate 26 is fixed at the lower end. The lower end plate 26 is a 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 hooks. 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 20mm, the four holes of the lower end plate 26 are φ18mm, arranged in a matrix, and the matrix side length is 130mm; the column base steel bars 28 and the base screws 33 are fixed on both sides of the column base steel plate 27, respectively. There are two column base steel bars 28, arranged in parallel, and four base screws 33, with specifications of φ18*70, arranged in a matrix, and the matrix side length is 130mm; the roof base steel bars 31 are fixed on one side of the roof base steel plate 30, with a total of two, arranged in parallel. 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 are determined according to the specific reconstruction of the roof arch frame; after the processing of the standard parts is completed, the processing parts are re-hot-dip galvanized.

[0078] 2) Quality assessment of solar greenhouse roof arch frames. For solar greenhouses that need to be demolished and rebuilt, conduct quality assessment of roof arch frames, check the rust, deformation, and damage of the arch frames, and use solar greenhouses that are in good condition, have scientific structures, and meet strength standards for reconstruction.

[0079] 3) Non-destructive disassembly of the greenhouse roof arch frame: 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: select 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-reconstructed solar greenhouse and the environmental characteristics of the site, and be able to determine the inclination angle of the support 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 cast 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 is pre-embedded with the column base 34, and the roof reinforced concrete foundation is pre-embedded with the 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 spacing between each column concrete foundation 29 is 6000 mm, and the spacing between each roof concrete foundation 32 is 1000 mm.

[0085] 7) Plastic greenhouse assembly and debugging:

[0086] 7.1) Install and fix the shed head and the column 24, and the column 24 is fixed on the column base 34 using the base screw 33;

[0087] 7.2) Lift the cross beam 14 to connect and fix it. Every two sections of the cross beam 14 are connected end to end and fixed with bolts to form a rigid whole. The two ends of the whole cross beam 14 are fixed to the roof by cross beam bolts 3, and the lower cross beam 5 is fixed to the column 24 by column U-bolts 22;

[0088] 7.3) Hoist the roof arches 16 on both sides of the cross beam 14, and fix the connecting angle steels 10 on the roof arches 16 and the web members 8 on the cross beam 14 with bolts through the arch bolts 11, and fix the ground-contacting end of the roof arches 16 on the roof base 37;

[0089] 7.4) Install the "T"-shaped connecting bracket 35, connect the two ends of the horizontal brace 18 to the upper chord 9 through the connecting bracket U-shaped bolts 19, and fix the lower end of the vertical brace 21 to the upper crossbeam 1; fix the two ends of the horizontal brace 18 to the turning point of the front and rear upper chords 9, so 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 rod, slot and diagonal brace and fix them with "U"-shaped buckles;

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

[0092] 7.7) Install plastic shed film, insect-proof net, water-proof net, film rolling machine and film pressing line. The plastic shed film, insect-proof net and water-proof net are fixed on the arch frame through the card slot, and the film pressing line is fixed on the embedded foundation;

[0093] 7.8) Install the insulation blanket and roller shutter according to the design requirements of the plastic greenhouse, and fix the upper end of the insulation blanket on 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 reconstruction work.

[0097] The above are only specific embodiments disclosed in the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of 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 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 in 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 angles and web bars that fix the upper beams and the lower beams. There are two connecting angles, which are respectively arranged on both sides of the upper beams and the lower beams and 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 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, and the lower ends of the upper chord and the lower chord are connected to the connecting Angle steel connection; the arch frame, upper chord and lower chord are two groups, symmetrically arranged on both sides of the beam, a "T"-shaped connecting bracket is fixedly connected above the upper beam, the "T"-shaped connecting bracket includes horizontal struts and vertical struts vertically connected to each other, the two ends of the horizontal struts are respectively connected to the two groups of upper chords, the upper end of the vertical struts is connected to the horizontal struts, and the lower end is connected to the upper beam, the upper end of the column is connected to the lower 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.

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 diagonal 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 are provided with four crossbeam steel plate holes at 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 rod is provided with web rod holes, the connecting angle steel is provided with angle steel holes, and the web rod and the connecting angle steel are fastened and connected via the web rod holes, the arch bolts and the angle steel 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 arranged at the upper end of the column, and four holes in the upper end steel plate of the column are arranged at the four corners of the upper end plate respectively. The upper end plate is connected to the lower cross beam through the holes in the upper end steel plate of the column and the U-shaped bolts of the column.

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, 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, 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.

7. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to any one of claims 1 to 6, characterized in that: A roof arch web is arranged between the upper chord and the lower chord, support steel plates are obliquely arranged at both ends of the horizontal support rod, four support steel plate holes are arranged at the four corners of the support steel plate, and the support steel plate is connected to the upper chord through the support steel plate holes and the connecting support U-bolts.

8. A method for rebuilding a modified 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 reconstruction standard parts, including preparation of beams, connecting angle steels, "T"-shaped connecting brackets, columns, column bases and roof bases; 2) Quality assessment of solar greenhouse roof arches: conduct quality assessment of solar greenhouse roof arches that need to be dismantled and rebuilt, check the rust, deformation and damage of the arches, and use solar greenhouses that are in good condition and meet the strength standards 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, Select 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 frame. 5) Reconstruction of the arch structure of the solar greenhouse roof, 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, the angle steel is fixed vertically at the cutting position of the rear roof, and the angle steel is fixed 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 foundation. The depth of each column and arch reinforced concrete foundation is 400mm, and the horizontal dimension is 200mm. The column reinforced concrete foundation is pre-embedded with the column base, and the roof reinforced concrete foundation is pre-embedded with the roof base; 7) Assembly and debugging of plastic greenhouses.

9. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 8 is characterized in that: The specific steps of step 1) are as follows: Preparation of beams: The beams are truss structures, including upper beams, lower beams and webs. The upper beams, lower beams and webs are all made of 100*100*3 hot-dip galvanized square steel tubes. The spacing between each web is 1000mm, and the spacing between the upper beam and the lower beam is 400mm. "V"-shaped 50*3 angle steel braces are reinforced between the webs. The beams are divided into sections of 6000mm each, and each section of the beam contains six webs, which are arranged from 100mm at one end and open at the other end. The upper and lower beams are fixed with beam steel plates at both ends. The beam steel plates are 170*170*5 hot-dip galvanized steel plates. Four beam steel plate holes are drilled at the four corners of the beam steel plate. Two beam web holes are drilled in the webs. Preparation of connecting angle steel: The connecting angle steel adopts 50*4 hot-dip galvanized angle steel, and two angle steel holes are drilled in the longitudinal direction of the connecting angle steel. 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. Preparation of columns: The columns are made of φ80*4 hot-dip galvanized round steel pipes. The upper end plate is fixed on the upper end of the column. The upper end plate is a 190*190*8 hot-dip galvanized steel plate. The lower end plate is fixed on the lower end. The lower end plate is a 180*180*8 hot-dip galvanized steel plate. Four holes are drilled on the upper end plate and the lower end plate respectively. Preparation of column base: The column base includes column base steel plate, column base steel bar and φ16 base screw. The column base steel bar is bent into a "J" shape, and the two ends are 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 bar is a φ10 threaded steel bar. 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, and the two ends are 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 bar is a φ10 threaded steel bar. The two holes of the web bars are φ22mm, with a spacing of 200mm; the two holes of the angle steel connecting the 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, and the four holes of the lower end plate are φ18mm, arranged in a matrix, with a matrix side length of 130mm; 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, there are four base screws, with a specification of φ18*70, arranged in a matrix, and the matrix side length is 130mm; the roof base steel bars are fixed on one side of the roof base steel plate, there are two in total, 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.

10. The modified large-span plastic greenhouse based on the solar greenhouse arch frame according to claim 9 is characterized in that: The specific steps of step 7) are as follows: 7.1) Install and fix the shed head and columns. Fix the columns to the column base with bolts; 7.2) Lift the beams to connect and fix them. Every two sections of the beams are connected end to end and fixed with bolts to form a rigid whole. The two ends of the beams are fixed to the top of the shed with beam bolts, and the lower beam is fixed to the column with column U-bolts. 7.3) Hoist the roof arches on both sides of the beam, and fix the connecting angle steel on the roof arches with the web bars on the beams through the arch bolts, and fix the ground-contacting end of the roof arches on the arch base; 7.4) Install the "T"-shaped connecting bracket. The two ends of the horizontal brace are connected to the upper chord of the roof arch through the U-shaped bolts of the connecting bracket. The lower end of the vertical brace is fixed to the upper beam. The two ends of the horizontal brace are fixed at the turning point of the upper chord of the front and rear roof arches, so that the horizontal brace is at the same height as the highest point of the arch. 7.5) Install the longitudinal tie rod, slots and diagonal braces, and secure them with "U"-shaped buckles; 7.6) Carry out rust-proof treatment on bolt joints and grounding foundation; 7.7) Install plastic shed film, insect-proof net, water-proof net, film rolling machine and film pressing line. The plastic shed film, insect-proof net and water-proof net are fixed on the arch frame through the card slot, and the film pressing line is fixed on the embedded foundation; 7.8) Install the insulation blanket and roller shutter according to the design requirements of the plastic greenhouse, and fix the upper end of the insulation blanket on the horizontal support rod; 7.9) Install other environmental control equipment and crop cultivation equipment according to production needs.

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