A method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses.

Abstract

This invention relates to the field of renovation technology for old and inefficient solar greenhouses, specifically providing a method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses. First, based on the corrosion and deformation of the original roof frame, the original roof frame is retained or removed, along with all components of the old, excavated, thick-walled solar greenhouse except for the roof frame and the surrounding walls. Next, the north-side thick-walled structure is renovated by thinning and lowering the original north-side thick-walled structure to form a new, low, thin wall. Protection measures for the north-side wall are determined based on the soil quality before renovation and the condition of the wall after renovation. The gable wall and greenhouse entrance are renovated by placing the portal frame within the gable wall on one side of the original entrance. The greenhouse roof structure is also renovated. Finally, the front drainage ditch is repaired or newly constructed. This renovation method is low-cost, eliminates the need for off-site soil transportation, and results in a greenhouse with high land use efficiency, good stability and light and temperature performance, good machine adaptability, and low risk of rainwater backflow.

Description

Technical Field

[0001] This invention relates to the field of renovation technology for old and inefficient solar greenhouses, specifically providing a renovation method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses. Background Technology

[0002] As an important component of my country's facility agriculture, solar greenhouses have long made significant contributions to increasing agricultural output. In the early stages of development, excavated thick-walled solar greenhouses were widely used due to their lower construction costs and better winter production performance, thus dominating the existing greenhouse market. However, over time, problems with excavated thick-walled solar greenhouses have gradually emerged, such as excessive internal columns, rainwater backflow, low land use efficiency due to excessively thick earthen walls, susceptibility to collapse and difficulty in access, poor lighting, and low mechanization levels. These issues severely restrict the sustainable development of the facility agriculture industry, necessitating the renovation of outdated excavated thick-walled solar greenhouses to adapt to the needs of modern agriculture.

[0003] Therefore, how to combine existing old and inefficient excavated thick earth wall solar greenhouses with low-cost renovations based on the characteristics of different old solar greenhouses, so as to improve land use efficiency while taking into account the safety and stability of the solar greenhouse structure, heat preservation and storage capacity, machine suitability, and effective prevention of rainwater backflow, has become a key issue that urgently needs to be solved in the renovation process of excavated thick earth wall solar greenhouses. Summary of the Invention

[0004] To address the problems of low land utilization efficiency, rainwater backflow, easy collapse, numerous pillars affecting cultivation, and unsatisfactory machine suitability in existing deep-walled greenhouses, this invention provides a renovation method to improve the land utilization efficiency of old deep-walled greenhouses. This method not only improves land utilization efficiency but also ensures the safety and stability of the greenhouse structure, its heat preservation and storage capacity, machine suitability, and effectively prevents rainwater backflow.

[0005] The method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses provided by this invention is as follows:

[0006] Step 1: Based on the corrosion and deformation of the original greenhouse front roof frame, retain or remove the original greenhouse front roof frame and the original greenhouse rear roof fixed columns, and remove all components of the old excavated thick earth wall solar greenhouse except for the original greenhouse front roof frame, the original greenhouse rear roof fixed columns and the enclosure wall.

[0007] Step 2: Modify the original thick earthen wall on the north side of the greenhouse. Thin out and lower the original thick earthen wall on the north side of the greenhouse to form the modified north wall. Determine the protection measures for the north wall based on the soil quality of the original thick earthen wall on the north side of the greenhouse before the modification and the quality of the wall after the modification.

[0008] Step 3: Modify the gable wall and greenhouse entrance / exit, and place the gantry device inside the gable wall on one side of the original entrance / exit;

[0009] Step four: Modify the greenhouse roof structure;

[0010] Step 5: Repair or construct new front drainage ditches.

[0011] In step one, check whether the roof frame has serious rust, corrosion, cracks or other forms of damage, whether the frame has buckled, deformed or loose connections, and determine whether the frame has reached the end of its service life based on the design and service life of the greenhouse and the expected life of the materials, so as to decide whether to retain or remove the original roof frame and the original greenhouse rear roof fixing columns.

[0012] If the greenhouse's usage requirements change, such as the need for more space, better lighting, or a higher level of automation, the existing roof frame may no longer meet these new requirements. In this case, it is necessary to remove the original roof frame and replace it.

[0013] As a preferred embodiment, the method of modifying the original thick earthen wall on the north side of the greenhouse in step two includes appropriately thinning and lowering the original thick earthen wall on the north side of the greenhouse, taking appropriate protective measures for the thinned and lowered earthen wall, and backfilling the soil stripped from the original thick earthen wall on the north side of the greenhouse to the greenhouse ground. After the backfilling is completed, the excavated solar greenhouse becomes an ordinary solar greenhouse, which can effectively prevent rainwater from flowing back into the greenhouse. The modified north wall is functionally transformed into a heat storage wall.

[0014] During the soil backfilling process, the ground height inside the greenhouse can be adjusted step by step by mechanical leveling. Under normal circumstances, the soil stripped from the original thick earthen wall on the north side is sufficient to backfill the greenhouse ground. If it is insufficient, additional soil can be added separately for backfilling.

[0015] As a preferred option, in step two, the thinned and lowered north wall has a base width of 2.5-4.0m, a top width of 1.0-1.5m, and a wall height of 2.0-3.0m. The thinned and lowered north wall is then used as a heat storage medium in the greenhouse.

[0016] The modified north wall requires appropriate protection measures based on the soil quality and wall condition. These measures are determined by factors such as soil uniformity, wall condition and expected service life, economic cost, and ease of construction. If the original thick earthen wall on the north side of the greenhouse is loose, cracked, or of poor quality, a retaining brick wall of a certain height is constructed at the lower end of the thinned and lowered modified earthen wall. The surface of the earthen wall is then covered with wire mesh and sprayed with grout (excluding the retaining brick wall). Preferably, the stacking height of the retaining brick wall is 50-70cm, more preferably 60-70cm. When the soil is uniform, the wall is compacted, and of good quality, a cement blanket can be directly laid on the entire surface of the earthen wall.

[0017] As a preferred embodiment, the method for modifying the gable wall and greenhouse entrance in step three includes: placing a gantry device with a length matching the thickness of the gable wall in the original entrance side of the greenhouse to replace the original low and narrow entrance; after the gantry device is placed, the original greenhouse gable wall is protected with the same protective measures as the modified north wall, and after the protective measures are completed, the gable wall and the modified north wall form an integrated enclosure wall; according to the size of the modified greenhouse roof, blocks can be built on the upper part of the original greenhouse gable wall, and the size of the gable wall after construction is adapted to the size of the modified greenhouse roof.

[0018] The method for placing the gantry device is as follows: after excavating the gable wall, place the gantry device, and then backfill the gable wall to complete the placement of the gantry device.

[0019] In a preferred embodiment, the gantry device is semi-circular in shape, and its frame is composed of multiple semi-circular steel pipes. The two ends of all the steel pipes are welded to a suitable rectangular frame, and the steel pipes are connected by multiple longitudinal steel pipes. The outer side is welded with wire mesh to form a whole. When in use, a layer of geotextile is covered on the outside of the device.

[0020] As a preferred embodiment, the method for modifying the greenhouse roof structure in step four includes: when the original roof frame of the old greenhouse can continue to be used, the roof is built using the original roof frame; when the original roof frame of the old greenhouse needs to be replaced, the frame is replaced according to the relevant parameters of the old greenhouse.

[0021] When using the original frame, foundations are set at the lower end of the original greenhouse front roof frame and the lower end of the original greenhouse rear roof fixed columns. Only the original greenhouse rear roof fixed columns are retained as fixed columns to support the rear roof. Other columns originally used to support the front roof are changed to movable columns. A galvanized steel pipe for the greenhouse rear slope is set at the rear end of the original front roof frame. The direction of the galvanized steel pipe for the greenhouse rear slope is along the outer contour of the modified north wall. After the roof is completed, a foundation is set at the lower end of the galvanized steel pipe for the greenhouse rear slope.

[0022] When replacing the frame, the roof angle can be calculated and the ridge height determined according to the theory of reasonable lighting period. The replacement rear roof fixing column is fixedly installed below the rear roof of the replaced greenhouse frame. At the same time, the lower end of the rear slope of the replaced greenhouse frame is set on the outside of the north wall, completely wrapping the north wall into the greenhouse. The lower end of the rear slope of the replaced greenhouse frame and the lower end of the replacement rear roof fixing column are set on the foundation.

[0023] As a preferred embodiment, the replaced greenhouse frame can be one of the following, depending on the span of the solar greenhouse: elliptical tubes, a combination of elliptical tubes and trusses, or a pure truss.

[0024] As a preferred option, elliptical tubes are used when the greenhouse span is within 12m, a combination of elliptical tubes and trusses is used when the span is 12-14m, and pure trusses are used when the span is above 14m.

[0025] As a preferred embodiment, the method for repairing or constructing a new front drainage ditch in step five includes: cleaning the existing front drainage ditch; if no front drainage ditch is set up in front of the old greenhouse, a new front drainage ditch can be built about 1m away from the greenhouse; the removed film can be used to lay on the surface of the drainage ditch.

[0026] As a preferred implementation, after the renovation is completed, potted crops can be planted on the upper part of the renovated north wall to further improve land use efficiency and heat storage capacity, thereby increasing production efficiency.

[0027] Compared with the old-fashioned solar greenhouses before renovation, the solar greenhouse renovation method provided by this invention has the following advantages:

[0028] (1) Improve land use efficiency. By thinning and lowering the thick earthen wall on the north side of the original greenhouse, the area occupied by the wall was reduced. At the same time, the space at the top of the modified earthen wall was used to plant potted crops, which improved the land use efficiency.

[0029] (2) The north wall was optimized and modified in situ, which preserved the good heat storage body in the greenhouse and effectively avoided polluting farmland and generating a large amount of construction waste.

[0030] (3) A lot of soil will be stripped during the renovation of the north wall. The stripped soil will be backfilled into the greenhouse, and the excavated solar greenhouse will be transformed into an ordinary solar greenhouse, which can effectively prevent the problem of rainwater backflow in the excavated solar greenhouse.

[0031] (4) The modified wall is transformed into a heat storage function and no longer bears external loads. Different reinforcement and protection measures are selected according to different soil types to ensure the safety of the soil wall on the north side and solve the problems of easy peeling and poor stability of the soil wall structure.

[0032] (5) If the original old greenhouse frame is in good condition, it can continue to be used, which can significantly reduce the cost of greenhouse renovation; if the frame is replaced, the light-transmitting roof angle of the greenhouse can be increased, which will improve the light effect of the renovated greenhouse and increase the night temperature, thus avoiding frost damage and significantly improving the overall light and temperature performance.

[0033] (6) The entrance and exit of the renovated greenhouse are larger and more suitable for mechanization than the original low and narrow doors of the sunken solar greenhouse, which improves production efficiency and reduces labor intensity.

[0034] (7) The columns on the front roof of the greenhouse after the renovation are all movable columns, which can effectively reduce the renovation cost, can be used for temporary support in the event of extreme weather, improve the greenhouse's disaster resistance, and can be dismantled during cultivation to meet the requirements of mechanized operation and conform to the national development plan. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the old, excavated, thick-walled greenhouse before its renovation.

[0036] Figure 2 This is a cross-sectional view of the greenhouse after its renovation using the original frame.

[0037] Figure 3 This is a cross-sectional view of the greenhouse after its renovation using the new frame.

[0038] Figure 4 This is a schematic diagram of wall modification when the soil quality of the thick earthen wall on the north side is poor.

[0039] Figure 5 A schematic diagram of wall modification when the soil quality of the thick earthen wall on the north side is relatively good;

[0040] Figure 6 This is a schematic diagram of the gable wall on one side of the entrance / exit after the renovation.

[0041] Figure 7 This is a schematic diagram of the gantry assembly;

[0042] Figure 8 This is a photograph of the greenhouse before the renovation in Example 1;

[0043] Figure 9 This is a photo of the modified greenhouse in Example 1.

[0044] In the diagram: 1 is the original thick earthen wall on the north side of the greenhouse; 2 is the original front roof frame of the greenhouse; 3 is the original fixed column of the rear roof of the greenhouse; 4 is the renovated north wall; 4-1 is the renovated earthen wall; 4-2 is the retaining brick wall; 4-3 is the wire mesh; 4-4 is the shotcrete layer; 4-5 is the cement blanket; 5 is the galvanized steel pipe on the rear slope of the greenhouse; 6 is the foundation; 7 is the movable column; 7-1 is the base; 8 is the longitudinal tie rod; 9 is the replaced greenhouse frame; 10 is the replaced fixed column of the rear roof; 11 is the original greenhouse gable wall; 12 is the portal frame device; 12-1 is the main frame of the portal frame device; 12-2 is the lower rectangular frame of the main frame of the portal frame device; 12-3 is the longitudinal connecting steel pipe of the portal frame device; 12-4 is the wire mesh of the portal frame device; 13 is the brick wall of the gable wall; 14 is the potted crops. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described clearly and in detail below with reference to embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0046] Figure 1 This is a cross-sectional view of an old, sunken, thick-walled, underground greenhouse. It includes the original north-side thick-walled structure 1, the original front roof structure 2, the original rear roof fixed columns 3, and the front roof fixed columns. Longitudinal tie rods 8 extend along the length of the greenhouse and are connected to the greenhouse frame via clips. The old greenhouse's north-side thick-walled structure occupies a large area, resulting in low land use efficiency and poor stability. Furthermore, the old greenhouse's sunken structure leads to frequent rainwater backflow, causing serious damage year after year. To address this, the inventor proposes a method to improve the land use efficiency of old, sunken, thick-walled, underground greenhouses.

[0047] Example 1

[0048] See Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The specific steps of the modification method provided by this invention are as follows:

[0049] Step 1: Dismantle all components of the old, excavated, thick-walled greenhouse except for the outer walls, but retain the original front roof frame 2 and the original rear roof fixed columns 3, as per [reference needed]. Figure 1 and Figure 2 Only the original thick earthen wall 1 on the north side of the greenhouse and the original greenhouse gable wall 11, as well as the original greenhouse front roof frame 2 and the original greenhouse rear roof fixed column 3, are retained, while other original structures (insulation blanket, greenhouse film, and other fixed columns except for the original greenhouse rear roof fixed column 3) are removed.

[0050] Step 2: Modify the original thick earthen wall 1 on the north side of the greenhouse, which can be referred to... Figure 2 The original thick earthen wall 1 on the north side of the greenhouse was thinned and lowered to form the modified north wall 4. The excess soil was backfilled into the original greenhouse floor. Based on the soil quality and wall condition of the original thick earthen wall 1 on the north side of the greenhouse before the modification, the protection measures for the modified north wall 4 were assessed and determined.

[0051] In this embodiment, the original thick earthen wall 1 on the north side of the greenhouse has a bottom width of 10m, a top width of 3m, and a height of 5m. After being thinned and lowered, the modified north wall 4 has a bottom width of 4m, a top width of 1.5m, and a wall height of 3m.

[0052] Reference Figure 1 , Figure 2 and Figure 3 In step two, the modified north wall 4 is formed by thinning and lowering the original thick earthen wall 1 on the north side of the greenhouse. The cross-sectional outline of the modified north wall 4 is still a trapezoidal shape that is wider at the bottom and narrower at the top. Thinning the original thick earthen wall 1 on the north side of the greenhouse can solve the problem of low land use efficiency caused by the large area occupied by the original thick earthen wall. Lowering the original thick earthen wall 1 on the north side of the greenhouse can improve the stability of the greenhouse earthen wall. The modified north wall 4 no longer bears the load of the greenhouse and is converted into a heat storage body in the greenhouse. The soil cut from the original thick earthen wall 1 on the north side of the greenhouse is used to backfill the original greenhouse. During the soil backfilling process, the ground height inside the greenhouse can be adjusted step by step by mechanical leveling to ensure that there is no height difference between the ground inside and outside the modified greenhouse. This realizes the transformation of the excavated greenhouse into a regular greenhouse and can effectively prevent rainwater backflow.

[0053] The protection measures for the modified north wall 4 described in step two can be referred to... Figure 4 or Figure 5 When the soil quality of the modified earthen wall 4-1 is poor, you can choose Figure 4 The protective measures include building a 50-70cm high retaining brick wall 4-2 along the outline of the earthen wall at the bottom of the modified earthen wall 4-1, then covering the surface of the modified earthen wall 4-1 with a wire mesh 4-3, and spraying grout on its surface after the wire mesh is installed to form a grout layer 4-4.

[0054] When the soil quality of the modified earthen wall 4-1 is good, you can choose Figure 5 As a protective measure, a layer of cement blanket 4-5 is laid on the entire surface of the modified earthen wall 4-1. After laying, water is sprayed to harden it. The above two protective measures are selected according to the soil quality and wall condition of the location of the greenhouse to be modified. Reinforcement can effectively prevent the earthen wall from collapsing.

[0055] Step 3: Modify the gable wall and greenhouse entrance / exit, which can be referred to... Figure 6 , Figure 7The gantry device 12 is placed inside the gable wall on the side of the original entrance and exit, and the original greenhouse gable wall 11 can be locally heightened as needed;

[0056] The method for modifying the original greenhouse entrance and exit described in step three involves placing the gantry device 12 into the original greenhouse gable wall 11, as can be referred to Figure 6 The northernmost point of the gantry device 12 is 50cm from the modified north wall 4; details of the gantry device can be found in [link to gantry device description]. Figure 7 The structure is semi-circular in shape. Its main frame 12-1 is composed of multiple semi-circular steel pipes. The two ends of all the steel pipes of the main frame 12-1 are welded to the lower rectangular frame 12-2 of the matching main frame. Multiple longitudinal connecting steel pipes 12-3 are set between the main frames 12-1. The outer side of the main frame 12-1 is welded with steel wire mesh 12-4 to form a whole. When in use, a layer of geotextile is covered on the outside of the main frame 12, and then it is placed in the gable wall on the side of the original greenhouse entrance. The main frame 12 is 2m high and 1.8m wide. The modified entrance can solve the problem of difficult access to the original greenhouse. Agricultural machinery can also directly enter the greenhouse through the entrance, realizing the mechanization transformation of the greenhouse.

[0057] When placing the gantry device 12, the original greenhouse gable wall 11 is dug up, the gantry device 12 is placed, and then the original greenhouse gable wall 11 is backfilled, thus completing the placement of the gantry device 12.

[0058] Reference Figure 6 After the greenhouse entrance and exit renovation is completed, the original greenhouse gable wall 11 will be renovated. The specific methods include: repairing the upper part of the original greenhouse gable wall 11, and then building a brick wall 13 of a certain height on the upper part of the original greenhouse gable wall 11. The shape and size of the top of the brick wall 13 match the shape and size of the two sides of the renovated greenhouse roof. The old greenhouse film removed from the original greenhouse is laid on the outside of the gable wall for waterproofing and recycling of the original materials. The gable walls on both sides can be reinforced as needed. The specific reinforcement method is the same as the protection measures for the north wall in step two. When the soil of the original greenhouse gable wall 11 is poor, a 50-70cm high retaining brick wall is built along the outline of the gable wall. Then, a net is covered on the surface of the gable wall. After the net is installed, grout is sprayed on its surface to form a grout layer. When the soil of the original greenhouse gable wall 11 is good, a layer of cement blanket is laid on the entire surface of the gable wall. After the blanket is laid, water is sprayed to harden it. The above two protection measures are selected according to the soil quality of the location of the renovated greenhouse. Reinforcement can effectively prevent the gable wall from collapsing.

[0059] As a preferred option, the reinforcement of the gable wall adopts the same protection measures as the reinforcement and renovation of the north wall 4. That is, when the reinforcement and renovation of the north wall 4 is carried out using the protection measures of retaining brick wall, wire mesh and shotcrete, the protection measures for the reinforcement of the gable wall are also the same as retaining brick wall, wire mesh and shotcrete; when the reinforcement and renovation of the north wall 4 is carried out using the protection measures of cement blanket, the protection measures for the reinforcement of the gable wall are also the same as cement blanket.

[0060] After the original greenhouse gable wall 1 was renovated and protected, it formed an integrated enclosure wall with the renovated north wall 4.

[0061] Step four: Modify the greenhouse roof structure. In this embodiment, the original roof frame is still used. See details. Figure 2 ;

[0062] In step four, the original greenhouse front roof frame 2 is used. The modified roof support structure consists of movable columns 7 and original greenhouse rear roof fixed columns 3. Using the original greenhouse front roof frame 2 and original greenhouse rear roof fixed columns 3 greatly reduces the modification cost. Subsequently, a galvanized steel pipe 5 for the greenhouse rear slope is installed at the rear end of the original greenhouse front roof frame 2. The direction of the galvanized steel pipe 5 for the greenhouse rear slope is along the outer contour of the modified north wall 4. At this point, the roof construction is completed. Foundations 6 are installed at the lower ends of the original greenhouse rear roof fixed columns 3, the lower ends of the original greenhouse front roof frame 2, and the lower ends of the greenhouse rear slope galvanized steel pipe 5. The modified north wall 4 is functionally converted into a heat storage body inside the greenhouse. The foundation 6 used in this application adopts a conventional independent column foundation.

[0063] The lower end of the movable column 7 is connected to the base 7-1 by a pivot pin. When agricultural mechanization is not carried out or extreme weather occurs, the movable column 7 can be set to improve the stability of the greenhouse. The movable column 7 can be set at an appropriate angle so that it can better transfer the load after it is connected to the original greenhouse frame 2. The movable column 7 can be removed when cultivation is carried out.

[0064] After the renovation is completed, potted crops 14 can be planted on the upper part of the renovated north wall 4 to further improve land use efficiency and heat storage performance, and increase production efficiency.

[0065] Step 5: Repair or build new drainage ditches. Excess soil can be backfilled onto the original greenhouse floor. The removed original greenhouse film can be laid on the surface of the drainage ditches.

[0066] Clean up the existing front drainage ditch. If the old greenhouse does not have a front drainage ditch, a new front drainage ditch can be built about 1m away from the greenhouse. The removed film can be used to lay on the surface of the drainage ditch.

[0067] See Figure 8 and Figure 9 , Figure 8 This is an old, excavated, thick-walled, earthen-walled greenhouse at a certain base. Figure 9 To adapt the greenhouse using this method, the bottom of the north earthen wall was reduced by approximately 6 meters compared to the original bottom of the thick north earthen wall. The greenhouse is 110 meters long, and the land use area increased by approximately 660 square meters after the renovation. 2 This method greatly improves land use efficiency, and the renovation method preserves the north earthen wall, providing a good heat storage body for the greenhouse, thus ensuring the greenhouse's overwintering production performance.

[0068] Example 2

[0069] Except for the roof frame, which is different from that in Example 1, the other modification methods in this embodiment are the same as in Example 1. Specifically, in step one, the original greenhouse front roof frame 2 and the original greenhouse rear roof fixed column 3 are removed together, and in step four, a new greenhouse roof frame is replaced.

[0070] When the original greenhouse front roof frame 2 is severely corroded and significantly deformed, rendering it unusable, the greenhouse frame can be replaced. The replaced greenhouse frame 9 can be one of the following, depending on the span of the greenhouse: elliptical tubes, a combination of elliptical tubes and trusses, or a pure truss. Replaced rear roof fixing columns 10 are fixedly installed under the rear roof of the replaced greenhouse frame 9. (Refer to...) Figure 3 Meanwhile, the lower end of the rear slope of the replaced greenhouse frame 9 is set on the outside of the north wall 4, completely enclosing the north wall 4 inside the greenhouse. The lower end of the rear slope of the replaced greenhouse frame 9 and the lower end of the replaced rear roof fixed column 10 are set on the foundation 6. The modified north wall 4 is functionally converted into a heat storage body inside the greenhouse and does not bear the upper load of the greenhouse.

[0071] As a preferred option, elliptical tubes are used when the greenhouse span is within 12m, a combination of elliptical tubes and trusses is used when the span is 12-14m, and pure trusses are used when the span is above 14m.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the spirit and principle of the present invention without any creative effort should be included within the protection scope of the present invention.

Claims

1. A method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses, characterized in that, Includes the following steps: Step 1: Based on the corrosion and deformation of the original greenhouse front roof frame (2), retain or remove the original greenhouse front roof frame (2) and the original greenhouse rear roof fixed column (3), and remove all components of the old excavated thick earth wall solar greenhouse except for the original greenhouse front roof frame (2), the original greenhouse rear roof fixed column (3) and the enclosure wall. Step 2: Modify the original thick earthen wall (1) on the north side of the greenhouse. Thin out and lower the original thick earthen wall (1) on the north side of the greenhouse to form the modified north wall (4). Determine the protection measures for the north wall (4) based on the soil quality of the original thick earthen wall (1) on the north side of the greenhouse before modification and the quality of the modified wall. Step 3: Modify the gable wall and greenhouse entrance / exit, and place the gantry device (12) inside the gable wall on one side of the original entrance / exit; Step four: Modify the greenhouse roof structure; Step 5: Repair or construct new front drainage ditches; In step two, the soil stripped from the original thick earthen wall (1) on the north side of the greenhouse is backfilled onto the greenhouse floor. After the backfilling is completed, the excavated solar greenhouse becomes an ordinary solar greenhouse, and the modified north wall (4) is functionally transformed into a heat storage wall. In step two, when the soil quality and wall quality of the original thick earthen wall (1) on the north side of the greenhouse are poor, a retaining brick wall (4-2) with a height of 50-70cm is built at the lower end of the modified earthen wall (4-1), and a wire mesh (4-3) is covered on the surface of the modified earthen wall (4-1) and sprayed to form a sprayed grout layer (4-4); when the soil quality and wall quality are good, a cement blanket (4-5) is directly laid on the surface of the earthen wall. In step three, a gate device (12) with a length matching the thickness of the gable wall is placed in the original entrance to the greenhouse to replace the original entrance. After the gate device (12) is placed in the original greenhouse gable wall (11), the same protective measures as the modified north wall (4) are adopted for protection. After the protection measures are completed, the gable wall and the modified north wall (4) form an integrated enclosure wall. The gantry device (12) is semi-circular in shape. Its frame (12-1) is composed of multiple semi-circular steel pipes. The two ends of all the steel pipes are welded to the matching rectangular frame (12-2). The steel pipes are connected by multiple longitudinal steel pipes (12-3). The outer side is welded with wire mesh (12-4) to form a whole. When in use, a layer of geotextile is covered on the outside of the device. After the renovation was completed, potted crops (14) were planted on the upper part of the renovated north wall (4).

2. The renovation method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses according to claim 1, characterized in that: In step three, according to the dimensions of the modified greenhouse roof, blocks are built on the upper part of the original greenhouse gable wall (11), and the dimensions of the gable wall after construction are adapted to the dimensions of the modified greenhouse roof.

3. The renovation method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses according to claim 1, characterized in that: Step four involves modifying the greenhouse roof structure by using the original roof frame when it can still be used, and replacing the frame according to the relevant parameters of the old greenhouse when the original roof frame needs to be replaced. When using the original frame, foundations (6) are set at the lower end of the original greenhouse front roof frame (2) and the lower end of the original greenhouse rear roof fixed column (3). Only the original greenhouse rear roof fixed column (3) is retained as a fixed column to support the rear roof. Other columns originally used to support the front roof are changed to movable columns (7). A greenhouse rear slope galvanized steel pipe (5) is set at the rear end of the original front roof frame. The direction of the greenhouse rear slope galvanized steel pipe (5) is along the outer contour of the modified north wall (4). After the roof is completed, a foundation (6) is set at the lower end of the greenhouse rear slope galvanized steel pipe (5). When replacing the frame, the roof angle is calculated and the ridge height is determined according to the theory of reasonable lighting period. The replacement rear roof fixed column (10) is fixedly installed below the rear roof of the replaced greenhouse frame (9). Other columns originally used to support the front roof are replaced with movable columns (7). At the same time, the lower end of the rear slope of the replaced greenhouse frame (9) is set on the outside of the north wall (4). The rear slope of the replaced greenhouse frame (9) is set along the outer contour of the modified north wall (4), completely wrapping the north wall (4) into the greenhouse. The lower end of the rear slope of the replaced greenhouse frame (9) and the lower end of the replacement rear roof fixed column (10) are set on the foundation (6).

4. The renovation method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses according to claim 3, characterized in that: The replaced greenhouse frame (9) can be one of the following depending on the span of the solar greenhouse: elliptical tube, combination of elliptical tube and truss, or pure truss.

5. The renovation method for improving the land use efficiency of old, excavated, thick-walled solar greenhouses according to claim 1, characterized in that: Step 5 includes methods for repairing or constructing a new front drainage ditch: cleaning the existing front drainage ditch; if no front drainage ditch is set up in front of the old greenhouse, a new front drainage ditch can be built 1 m away from the greenhouse; the removed film can be used to lay on the surface of the drainage ditch.

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