A comprehensive saline-alkali land improvement system based on sand mixing and straw return

Abstract

This invention provides a comprehensive saline-alkali land improvement system based on sand blending and straw return to the field. It includes multiple improvement units set within the saline-alkali land, interconnected by connecting pipes. Each improvement unit consists of a bottom improvement bag and an improvement sleeve. The bottom improvement bag is filled with a layer of construction waste mixture. An opening is provided on the top surface of the bottom improvement bag, and the improvement sleeve, containing a sand blend layer, is fitted inside the opening. A straw blend layer covers the sand blend layer, level with the surface of the saline-alkali land. In the later stages of use, this invention naturally degrades, causing the construction waste blend layer in the bottom improvement bag to disperse, thus creating a circumferential improvement effect. This allows for regional improvement of saline-alkali land, driving overall improvement of the land, reducing the cost of saline-alkali land improvement, and facilitating improved economic efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of saline-alkali land improvement systems, specifically relating to a comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field. Background Technology

[0002] Saline-alkali land improvement refers to the process of reducing soil salinity, improving soil structure, and enhancing soil fertility through a series of measures to make it suitable for agricultural production or ecological restoration. The improvement of saline-alkali land mostly begins with lowering the groundwater level through drainage systems to reduce salt rise, followed by increasing soil permeability to promote water and salt transport. Then, increasing fertilizer application to improve soil fertility, promoting microbial activity, or utilizing salt-tolerant plants or microorganisms to improve the soil environment.

[0003] However, in the process of comprehensive improvement of saline-alkali land, the large input of finished products such as fertilizers and biological agents increases the cost of saline-alkali land improvement, which affects the economic benefits after the improvement of saline-alkali land.

[0004] Based on this, a comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field, in order to address the shortcomings of the prior art mentioned above.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] Firstly, a comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field includes multiple improvement units set up in the saline-alkali land, and the multiple improvement units are connected to each other through connecting pipelines.

[0008] The improvement unit consists of a bottom improvement bag and an improvement sleeve. The bottom improvement bag is a square bag, and a mixed layer of construction waste is also filled inside the bottom improvement bag.

[0009] The bottom improvement bag has an opening on its top surface, and an improvement sleeve is fitted inside the opening, with a sand-mixed layer inside the improvement sleeve.

[0010] A layer of straw mixture is also covered on the sand-mixed layer, and the straw mixture layer is level with the surface layer of the saline-alkali land.

[0011] As a further explanation of the present invention, the bottom improvement bag is made of a biodegradable starch-based material that has been waterproofed. Connection ports are provided in four directions on the outer periphery of the bottom improvement bag. The ports of the connecting pipe are connected to two adjacent connection ports. The bottom surface of the bottom improvement bag is set on the same horizontal plane. The connecting pipe allows water that has seeped into the bottom of the bottom improvement bag to circulate, thereby improving the efficiency of water resource utilization.

[0012] As a further explanation of the present invention, the connecting pipe is specifically a pipe made of polylactic acid, and the inner diameter of the connecting pipe is set between 3-5 cm.

[0013] As a further explanation of the present invention, the construction waste mixed layer is specifically made by mixing construction waste and saline-alkali soil in saline-alkali land, wherein the mixing ratio of construction waste and saline-alkali soil is 1:3-5.

[0014] As a further explanation of the present invention, the construction waste is made by mixing crushed bricks and concrete blocks in equal proportions, and the particle size of the construction waste is no greater than 3 cm.

[0015] As a further explanation of the present invention, the improved sleeve is specifically a funnel-shaped sleeve made of polylactic acid. The smaller end of the bottom hole of the improved sleeve extends 8-10 cm into the mixed layer of construction waste. The filling height of the sand-mixed layer inside the improved sleeve is 5-8 cm less than the maximum filling height of the improved sleeve.

[0016] As a further explanation of the present invention, the sand-mixed layer is made by mixing sand and saline-alkali soil, and the mixing ratio of sand and saline-alkali soil is 1:3-5.

[0017] As a further explanation of the present invention, the straw mixing layer is made by mixing crushed straw and saline-alkali soil. The maximum length of the crushed straw does not exceed 5cm. The depth of the straw mixing layer is set at 15-20cm. The depth of the construction waste mixing layer and the sand-mixed layer is not less than the depth of the straw mixing layer.

[0018] As a further explanation of the present invention, the maximum cross-sectional area of ​​the sand-mixed layer is not less than the cross-sectional area of ​​the construction waste mixing layer, and the cross-sectional area of ​​the straw mixing layer is greater than the maximum cross-sectional area of ​​the sand-mixed layer.

[0019] Secondly, a method for using a comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field includes the following steps:

[0020] S1. Excavate multiple improvement trenches at intervals of 80-120cm in the saline-alkali land, excavate the bottom surfaces of multiple improvement trenches to the same horizontal plane, and lay connecting pipelines at the bottom of adjacent improvement trenches. The depth of the improvement trenches is greater than the depth of the improvement unit.

[0021] S2. Place the bottom improvement bag of the salt improvement unit on the bottom surface of the improvement base trench, and connect the port of the connecting pipe to the connection port of the bottom improvement bag to complete the connection between adjacent bottom improvement bags.

[0022] S3. Fill the bottom improvement bag with the construction waste mixture layer. Stop when the construction waste mixture layer is filled to the opening of the bottom improvement bag. Use saline-alkali soil to backfill the gap between the outer periphery of the bottom improvement bag and the improvement trench, so that the outer periphery of the bottom improvement bag is in contact with the saline-alkali soil.

[0023] S4. Insert the smaller diameter end of the bottom hole of the improved sleeve into the construction waste mixing layer to complete the installation of the improved sleeve. Then, use the gap between the outer periphery of the improved sleeve and the improved foundation trench to make the outer periphery of the improved sleeve contact the saline-alkali soil. Then fill the improved sleeve with a sand-mixed layer.

[0024] S5. After leveling the top surface of the sand-mixed layer, fill it with the straw mixture layer. After the straw mixture layer is filled, irrigate the area within the straw mixture layer, using 10-12 kg of irrigation water per square meter of straw mixture layer. After irrigation, apply a membrane to the surface of the straw mixture layer to retain moisture, and then plant the improved crops to complete the saline-alkali land improvement operation.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. This invention sets up multiple improvement units in saline-alkali land. Each improvement unit consists of a bottom improvement bag and an improvement sleeve. The bottom improvement bag is a square bag made of a waterproof, biodegradable starch-based material. It can naturally degrade in the later stages of use, causing the mixed layer of construction waste inside the bottom improvement bag to disperse, thereby forming a circumferential improvement radiation effect. This allows the improvement of saline-alkali land in a regionalized manner to drive the improvement of the overall saline-alkali land, reducing the cost of saline-alkali land improvement and improving the economic benefits of saline-alkali land improvement.

[0027] 2. In this invention, connection ports are provided in four directions on the outer periphery of the bottom improvement bag. The ports of the connecting pipes are connected to two adjacent connection ports. The bottom surface of the bottom improvement bag is set on the same horizontal plane. The water that has permeated into the bottom of the bottom improvement bag can circulate through the connecting pipes, thereby improving the efficiency of water resource utilization.

[0028] 3. This invention further improves the bottom of the bag by filling it with a construction waste mixture layer. The construction waste mixture layer is specifically made by mixing construction waste with saline-alkali soil from the saline-alkali land. The construction waste is made by mixing crushed bricks and concrete blocks in equal proportions. Mixing the bricks and concrete blocks with the saline-alkali soil can not only reuse the bricks and concrete blocks, reduce waste accumulation, realize resource recycling, and reduce improvement costs, but also improve soil permeability and drainage performance of saline-alkali land through the bricks and concrete blocks.

[0029] 4. In this invention, the bottom improvement bag has an improvement sleeve inside the opening, and the improvement sleeve is filled with a sand-mixed layer. Specifically, the improvement sleeve is a funnel-shaped sleeve made of polylactic acid. The funnel-shaped sleeve can increase the surface area of ​​the improvement unit, thereby increasing the improvement range. The smaller end of the bottom hole of the improvement sleeve extends into the construction waste mixing layer by 8-10cm, which can improve the stability of the improvement sleeve during use. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a top view of the usage state of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Improvement unit; 2-Saline-alkali land; 3-Connecting pipeline; 4-Bottom improvement bag; 41-Connecting port; 5-Construction waste mixing layer; 6-Improvement sleeve; 7-Sand mixing layer; 8-Straw mixing layer; 9-Improved crop; 91-Crop root system. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field, including multiple improvement units 1 set in saline-alkali land 2, the multiple improvement units 1 being interconnected by a connecting pipe 3, the connecting pipe 3 enabling water circulation at the bottom of the improvement unit 1, thereby maximizing the utilization rate of water resources and avoiding the phenomenon of uneven distribution of water resources;

[0036] The improvement unit 1 consists of a bottom improvement bag 4 and an improvement sleeve 6. The bottom improvement bag 4 is a square bag made of a waterproof, biodegradable starch-based material. It can naturally degrade in the later stages of use, causing the construction waste mixture layer 5 inside the bottom improvement bag 4 to disperse, thereby forming a circumferential improvement radiation effect. This can drive the overall improvement of saline-alkali land through regional saline-alkali land improvement, reduce the cost of saline-alkali land improvement, and facilitate the improvement of the economic benefits of saline-alkali land improvement.

[0037] Connection ports 41 are provided in four directions on the outer periphery of the bottom improved bag 4. The ports of the connecting pipe 3 are connected to two adjacent connection ports 41. The bottom surface of the bottom improved bag 4 is set on the same horizontal plane. The water that has seeped into the bottom of the bottom improved bag 4 can be circulated through the connecting pipe 3, thereby improving the efficiency of water resource utilization.

[0038] The connecting pipe 3 is specifically made of polylactic acid. The connecting pipe 3 can also undergo natural degradation in the later stages of use, which can reduce the space occupied by the connecting pipe 3 and thus reduce the waste of resources.

[0039] The inner diameter of the connecting pipe 3 is set between 3-5cm, which can not only complete the initial water connection work, but also avoid the phenomenon of water leakage due to the middle section being too large, thus improving the service life of the connecting pipe.

[0040] The bottom improvement bag 4 is also filled with a construction waste mixing layer 5, which is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land 2. The construction waste is made by mixing crushed bricks and concrete blocks in equal proportions. The particle size of the construction waste is no more than 3cm. Mixing bricks and concrete blocks with saline-alkali soil can not only reuse bricks and concrete blocks, reduce waste accumulation, realize resource recycling, and reduce improvement costs, but also increase soil permeability and improve the drainage performance of saline-alkali land through bricks and concrete blocks.

[0041] The mixing ratio of construction waste and saline-alkali soil is 1:3-5, which can maximize the utilization rate of construction waste.

[0042] The bottom improvement bag 4 has an opening on its top surface, and an improvement sleeve 6 is fitted inside the opening. The improvement sleeve 6 is filled with a sand-mixed layer 7. The improvement sleeve 6 is specifically a funnel-shaped sleeve made of polylactic acid. The funnel-shaped sleeve can increase the surface area of ​​the improvement unit, thereby increasing the improvement range. The smaller end of the bottom hole of the improvement sleeve 6 extends 8-10cm into the construction waste mixing layer 5, which can improve the stability of the improvement sleeve 6 during use.

[0043] The sand-mixed layer 7 is made of a mixture of sand and saline-alkali soil, with a mixing ratio of 1:3-5. The filling height of the sand-mixed layer 7 inside the improved sleeve 6 is 5-8 cm less than the maximum filling height of the improved sleeve 6, which facilitates improving the utilization efficiency of the sand-mixed layer 7.

[0044] A straw mixture layer 8 is also covered on the sand-mixed layer 7. The straw mixture layer 8 is level with the surface of the saline-alkali land 2. The straw mixture layer 8 is made of straw that has been crushed and mixed with saline-alkali soil. The maximum length of the crushed straw does not exceed 5 cm. The depth of the straw mixture layer 8 is set at 15-20 cm. The depth of the construction waste mixture layer 5 and the sand-mixed layer 7 is not less than the depth of the straw mixture layer 8.

[0045] In practical application, an appropriate amount of microbial inoculant is mixed into the straw mixing layer 8, which can accelerate the decomposition of straw and thus improve the improvement efficiency of saline-alkali land 2.

[0046] The maximum cross-sectional area of ​​the sand-mixed layer 7 is not less than the cross-sectional area of ​​the construction waste mixing layer 5, and the cross-sectional area of ​​the straw mixing layer 8 is greater than the maximum cross-sectional area of ​​the sand-mixed layer 7. This ensures the stability of the improvement unit 1 while maximizing the utilization of the improvement unit, and facilitates the integration of adjacent improvement units 1 in local areas during the improvement process, thereby completing the improvement of the saline-alkali land area.

[0047] The above-mentioned method for using the comprehensive saline-alkali land improvement system based on sand mixing and straw return to the field includes the following steps:

[0048] S1. Excavate multiple improvement trenches at intervals of 80-120cm within the saline-alkali land 2, excavate the bottom surfaces of the multiple improvement trenches to the same horizontal plane, and lay connecting pipes 3 at the bottom of adjacent improvement trenches. The depth of the improvement trenches is greater than the depth of the improvement unit 1.

[0049] S2. Place the bottom improvement bag 4 of the salt improvement unit 1 on the bottom surface of the improvement base trench, and connect the port of the connecting pipe 3 to the connection port 41 of the bottom improvement bag 4 to complete the connection between adjacent bottom improvement bags 4.

[0050] S3. Fill the construction waste mixture layer 5 into the bottom improvement bag 4. Stop when the construction waste mixture layer 5 is filled to the opening of the bottom improvement bag 4, and use saline-alkali soil to backfill the gap between the outer periphery of the bottom improvement bag 4 and the improvement trench, so that the outer periphery of the bottom improvement bag 4 is in contact with the saline-alkali soil.

[0051] S4. Insert the smaller end of the bottom hole of the improved sleeve 6 into the construction waste mixing layer 5 to complete the installation of the improved sleeve 6. Then, use the saline-alkali soil to fill the gap between the outer periphery of the improved sleeve 6 and the improved foundation trench, so that the outer periphery of the improved sleeve 6 is in contact with the saline-alkali soil. Then fill the improved sleeve 6 with the sand-mixed layer 7.

[0052] S5. After leveling the top surface of the sand-mixed layer 7, fill the straw-mixed layer 8. After the straw-mixed layer 8 is filled, irrigate the area of ​​the straw-mixed layer 8. Irrigate 10-12 kg of irrigation water per square meter of the straw-mixed layer 8. After irrigation, apply a membrane to the surface of the straw-mixed layer 8 to retain moisture, and then plant the improved crop 9.

[0053] The improved crop 9 is a salt-tolerant crop. During the planting process, the crop roots 91 can extend step by step through the straw mixing layer 8 into the sand mixing layer 7 and the construction waste mixing layer 5. The crop roots 91 are used to carry out natural crop improvement of saline-alkali soil. During use, as the bottom improvement bag 4, improvement sleeve 6 and connecting pipe 3 naturally degrade, the improvement unit 1 can be degraded as a whole, reducing the occupation of the internal space of the saline-alkali land 2. It also allows the sand mixing layer 7 and the construction waste mixing layer 5 to naturally disperse in the inner layer of the saline-alkali land 2. Together with the crop roots 91, the improvement work of the entire saline-alkali land area can be completed. It is environmentally friendly and practical.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field, characterized in that: It includes multiple improvement units (1) set in saline-alkali land (2), and the multiple improvement units (1) are connected to each other through connecting pipes (3); The improvement unit (1) consists of a bottom improvement bag (4) and an improvement sleeve (6). The bottom improvement bag (4) is a square bag, and a construction waste mixture layer (5) is also filled inside the bottom improvement bag (4). The bottom improvement bag (4) has an opening on its top surface, and an improvement sleeve (6) is fitted inside the opening. The improvement sleeve (6) is filled with a sand-mixed layer (7). The bottom improvement bag (4) is made of a biodegradable starch-based material that has been waterproofed. There are connection ports (41) on all four directions around the bottom improvement bag (4). The port of the connecting pipe (3) is connected to two adjacent connection ports (41). The bottom surface of the bottom improvement bag (4) is set on the same horizontal plane. Water that has penetrated into the bottom of the bottom improvement bag (4) can be circulated through the connecting pipe (3), thereby improving the efficiency of water resource utilization. The improvement sleeve (6) is specifically a funnel-shaped sleeve made of polylactic acid. The smaller end of the bottom hole of the improvement sleeve (6) extends 8-10cm into the construction waste mixing layer (5). The filling height of the sand-mixed layer (7) inside the improvement sleeve (6) is 5-8cm smaller than the maximum filling height of the improvement sleeve (6). A straw mixture layer (8) is also covered on the sand-mixed layer (7), and the straw mixture layer (8) is level with the surface of the saline-alkali land (2).

2. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, The connecting pipe (3) is specifically made of polylactic acid, and the inner diameter of the connecting pipe (3) is set between 3-5 cm.

3. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, The construction waste mixed layer (5) is specifically made by mixing construction waste and saline-alkali soil in the saline-alkali land (2), and the mixing ratio of construction waste and saline-alkali soil is 1:3-5.

4. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 3, characterized in that, The construction waste is made by mixing crushed bricks and concrete blocks in equal proportions, and the particle size of the construction waste is no greater than 3cm.

5. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, The sand-mixed layer (7) is made of a mixture of sand and saline-alkali soil, with a mixing ratio of 1:3-5.

6. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, The straw mixing layer (8) is made of straw that has been crushed and mixed with saline-alkali soil. The maximum length of the crushed straw is no more than 5cm. The depth of the straw mixing layer (8) is set at 15-20cm. The depth of the construction waste mixing layer (5) and the sand mixing layer (7) is not less than the depth of the straw mixing layer (8).

7. The comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, The maximum cross-sectional area of ​​the sand-mixed layer (7) is not less than the cross-sectional area of ​​the construction waste mixing layer (5), and the cross-sectional area of ​​the straw mixing layer (8) is greater than the maximum cross-sectional area of ​​the sand-mixed layer (7).

8. The method of using the comprehensive improvement system for saline-alkali land based on sand mixing and straw return to the field according to claim 1, characterized in that, Includes the following steps: S1. In the saline-alkali land (2), excavate multiple improved foundation trenches at intervals of 80-120cm, excavate the bottom surfaces of multiple improved foundation trenches to the same horizontal plane, and lay connecting pipes (3) at the bottom of adjacent improved foundation trenches. The depth of the improved foundation trenches is greater than the depth of the improved unit (1). S2. Place the bottom improvement bag (4) of the salt improvement unit (1) on the bottom surface of the improvement base trench, and connect the port of the connecting pipe (3) to the connection port (41) of the bottom improvement bag (4) to complete the connection between adjacent bottom improvement bags (4). S3. Fill the construction waste mixture layer (5) into the bottom improvement bag (4). Stop when the construction waste mixture layer (5) is filled to the opening of the bottom improvement bag (4). Use saline-alkali soil to backfill the gap between the outer periphery of the bottom improvement bag (4) and the improvement trench, so that the outer periphery of the bottom improvement bag (4) is in contact with the saline-alkali soil. S4. Insert the smaller end of the bottom hole of the improved sleeve (6) into the construction waste mixing layer (5) to complete the installation of the improved sleeve (6). Then, use the saline-alkali soil to fill the gap between the outer periphery of the improved sleeve (6) and the improved foundation trench so that the outer periphery of the improved sleeve (6) contacts the saline-alkali soil. Then fill the improved sleeve (6) with the sand-mixed layer (7). S5. After leveling the top surface of the sand-mixed layer (7), the straw-mixed layer (8) is filled. After the straw-mixed layer (8) is filled, irrigation is carried out in the area of ​​the straw-mixed layer (8). 10-12 kg of irrigation water is used per square meter of the straw-mixed layer (8). After irrigation, the surface of the straw-mixed layer (8) is treated with a peritoneum to retain moisture. Then, the improved crop (9) is planted to complete the saline-alkali land improvement operation.

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