An ecological concealed pipe drainage structure for improving saline-alkali land and its application method

Abstract

The present invention proposes an ecological concealed pipe drainage structure for improving saline-alkali land and an application method thereof, which relates to the technical field of soil drainage and saline-alkali land management; the ecological concealed pipe drainage body includes a plurality of drainage units connected by assembly, and the drainage unit includes: an inner core layer, a skeleton layer, and a permeable filter cloth layer, etc.; an application method of an ecological concealed pipe drainage structure for improving saline-alkali land includes S1: land leveling; S2: determining layout parameters and plans according to the soil physical and chemical properties, basic data and specifications of the saline-alkali land; S3: processing and manufacturing the ecological concealed pipe drainage body; S4: installation; S5: planting crops on the saline-alkali land; S6: soil salt leaching; S7: drainage and salt removal; S8: anti-blocking and maintenance of the ecological concealed pipe drainage body and improvement of the air permeability of the saline-alkali land, etc. The present invention is green and environmentally friendly, has good drainage and desalination effects, is not easily blocked, can improve the air permeability of the saline-alkali land, and meets the technical requirements of the green development of the saline-alkali land.

Description

Technical Field

[0001] The invention relates to the technical field of soil drainage and saline-alkali land management, and in particular to an ecological concealed pipe drainage structure for saline-alkali land improvement and an application method thereof. Background Art

[0002] At present, there are many methods for improving saline-alkali land, the most common of which are planting salt-alkali tolerant crops, applying organic fertilizer to improve soil, digging open ditches to facilitate drainage and desalination, using plastic film to block salt and alkali, and desalination through underground pipes. Desalination through underground pipes means that the salt water in the soil is introduced into the drainage pipes and discharged from the soil through the underground pipe network buried under the soil layer of saline-alkali land. There are many micropores distributed on the underground pipe wall to achieve the effect of washing and desalination.

[0003] The current concealed pipe materials include ceramic pipes, concrete pipes, plastic pipes, etc. Some pipes are relatively expensive and difficult to popularize and apply; some pipes are heavy and difficult to construct; some plastic pipes are buried underground and are prone to secondary pollution.

[0004] In addition, the concealed drainage system mostly uses corrugated plastic pipes with holes as water suction pipes. Since the water suction pipes are buried deep in the soil, if the filter material outside the pipe is not properly set or in places where the soil is prone to siltation, the holes are easily blocked and the pipes are blocked, which reduces the drainage capacity of the pipes and even causes the drainage concealed pipes to fail and cannot be maintained. At the same time, the waterlogging in the field cannot be discharged in time, which affects the aeration of the soil and worsens the crop growth environment.

[0005] The drainage efficiency of traditional drainage pipes in unsaturated soil is not high. This is because under unsaturated conditions, the combined effect of the atmospheric pressure in the pipes and the matrix suction in the soil makes it difficult for soil moisture to automatically enter the pipes. The moisture always flows around the pipes. Only when the soil around the pipes reaches saturation will the moisture enter the pipes and be drained away.

[0006] In saline irrigation areas, the groundwater level is generally shallow. Under the action of capillary force, the groundwater rises to the surface, and the shallow soil has backwater and night tide phenomena, resulting in cold soil, low ground temperature, slow soil warming, poor soil permeability, and hindered seed germination and root development of crops. At present, the cost-effective methods such as concealed pipe drainage are used to control the groundwater level in saline irrigation areas. However, the use of concealed pipe drainage technology cannot solve the problems of cold soil, low ground temperature, slow soil warming, and poor soil ventilation and permeability in saline areas.

[0007] Therefore, in order to meet the technical needs of green development of saline-alkali land, it is necessary to find an ecological underground pipe that is green and environmentally friendly, has good drainage and desalination effects, is not easily blocked, and can improve the aeration of saline-alkali land. Summary of the invention

[0008] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes an ecological concealed pipe drainage structure for improving saline-alkali land and an application method thereof.

[0009] The technical solution of the present invention to solve the technical problem is:

[0010] On the one hand, the technical solution proposes an ecological concealed pipe drainage structure for improving saline-alkali land, including a plurality of assembled and connected drainage units, wherein the drainage units include:

[0011] An inner core layer, the inner core layer is located in the middle of the drainage unit; the inner core layer is a straw bundle, and the straw bundle is formed by bundling a plurality of straws;

[0012] A skeleton layer, the skeleton layer is sleeved on the inner core layer to form a skeleton support; the skeleton layer includes two pairs of bamboo pieces, and the bamboo pieces are provided with a plurality of penetration holes; the bamboo pieces are formed by splitting a bamboo tube with a circular cross section into two; the inner diameter of the bamboo tube is smaller than the outer diameter of the straw bundle; when the two bamboo pieces are buckled on the inner core layer, a groove is formed between the two bamboo pieces along the length direction of the bamboo pieces;

[0013] A water-permeable filter cloth layer is wound around the skeleton layer to gather and wrap the skeleton layer and the inner core layer into one; the water-permeable filter cloth layer surrounds the slot to form a guide channel.

[0014] Preferably, the inner core layer further comprises a first straw rope, and the first straw rope is wound around the straw bundle in a tightly arranged manner to form a supporting reinforcement layer.

[0015] Preferably, the drainage units are connected via a short section, and both ends of the short section are respectively plugged and fixed to the drainage units on both sides.

[0016] Preferably, the short section is provided with a plug hole, and the plug hole is used to realize the assembly connection between the vertically arranged permeability enhancement column and the transversely arranged short section.

[0017] Preferably, a central tube is provided at the center of the inner core layer, the central tube is arranged along the length direction of the drainage unit, and the central tube is provided with a plurality of first microholes along the tube body.

[0018] Preferably, a hose is provided in the guide channel, and a plurality of second microholes are arranged on the hose body.

[0019] On the other hand, the technical solution also proposes an application method of an ecological underground drainage structure for saline-alkali land improvement, which is used for the treatment of saline-alkali land. Based on the ecological underground drainage structure for saline-alkali land improvement, the steps included are as follows:

[0020] S1: Land leveling;

[0021] S2: Determine the layout parameters and plans based on the soil physical and chemical properties, basic data and specifications of the saline-alkali land;

[0022] S3: Processing and manufacturing ecological concealed pipe drainage bodies;

[0023] S4: Installation:

[0024] Dig drainage ditches at the designed location, lay ecological underground drainage bodies and install water collection wells; connect the ecological underground drainage bodies with the water collection wells to discharge the diverted saline-alkali water into the water collection wells; install a pump in the water collection wells, connect the drainage outlet of the pump with the drainage ditch, and lift up the salt water in the water collection wells for discharge;

[0025] S5: Planting crops on saline-alkali land;

[0026] S6: Soil salt leaching:

[0027] Use rainfall or irrigation to wash saline-alkali land, washing the salt from the upper soil layer to the lower soil layer;

[0028] S7: Drainage and salt removal: Soil water containing leached salts infiltrates into the ecological underground drainage body, and is collected by the ecological underground drainage body into the collection well, and then discharged to the drainage ditch by the water pump in the collection well, thereby reducing the salt content in the soil.

[0029] Preferably, the specific method for processing and manufacturing the ecological concealed pipe drainage body in S3 is as follows:

[0030] S31: Prepare bamboo tubes, straws and permeable filter cloth layers that meet the requirements;

[0031] S32: bundling the straw into bundles to form straw bundles, and cutting the straw bundles into required lengths using a cutting device to obtain an inner core layer;

[0032] S33: cutting the bamboo tube into two parts to obtain bamboo pieces that meet the requirements; then drilling holes around the bamboo pieces using a drilling tool to form penetration holes to obtain a skeleton layer;

[0033] S34: placing a skeleton layer formed by two bamboo pieces on the inner core layer; forming a groove between the two bamboo pieces along the length direction of the bamboo pieces;

[0034] S35: Wrapping the water-permeable filter cloth layer on the skeleton layer, and wrapping the skeleton layer and the inner core layer together; the water-permeable filter cloth layer surrounds the slot to form a guide channel; thus, a set of drainage units is formed;

[0035] S36: A pull rope is respectively inserted into the guide channel of each set of drainage units, and both ends of the pull rope extend outside the drainage unit with sufficient margin;

[0036] S37: Splice the multiple drainage units end to end to form an ecological concealed pipe drainage body; when splicing, tie the pull ropes corresponding to the drainage units to form a whole; in this way, a complete pulling rope is formed in the guide channel;

[0037] S38: Tie a hose at one end of a traction rope, and then drag the other end of the traction rope. As the traction rope moves, the hose is driven to move from one end of the guide channel to the other end, thereby realizing the threading and connection of the hose. After the threading is completed, release the connection between the traction rope and the hose to form an ecological concealed pipe drainage body with a hose.

[0038] Preferably, it also includes S8: anti-blocking maintenance of ecological underground drainage and improvement of air permeability of saline-alkali land;

[0039] ① The methods for preventing and maintaining ecological concealed pipe drainage bodies are:

[0040] The flushing equipment is installed around the water collection well, and the water outlet of the flushing equipment is connected to one end of the hose through a water pipe; the flushing equipment is started, and the water flows through the hose in the reverse direction along the ecological underground drainage body, and is ejected through the second micropore of the hose during the flow process, forming a jet in the guide channel, which plays a pressurizing role, can realize the cleaning of the ecological underground drainage body, and achieve anti-blocking cleaning;

[0041] ② The methods for improving the air permeability of saline-alkali land are:

[0042] The gas supply equipment is installed around the water collection well, and the gas outlet of the gas supply equipment is connected to one end of the hose through the air pipe; the gas supply equipment is started, and the gas flows in reverse along the ecological concealed pipe drainage body through the hose, and is ejected through the second micropores of the hose during the flow, forming a gas jet in the guide channel, thereby achieving oxygenation treatment of the saline-alkali soil and increasing the soil temperature and air permeability.

[0043] The above technical solution has the following advantages or beneficial effects:

[0044] 1. The ecological concealed pipe drainage body designed by the present invention adopts green natural materials to form an ecological composite structure of "straw bundles + bamboo slices + permeable filter cloth layer". The bamboo slices are used to construct a skeleton layer, which has a good supporting effect and prevents the internal straw bundles from being squeezed and compacted under pressure. The gaps between the straws can form channels for drainage, so that the water permeability is not reduced, thereby ensuring the soil drainage effect. It is low in price, rich in materials, simple in construction, pollution-free to the environment, and has significant economic, social and ecological environmental benefits.

[0045] 2. The first straw rope is wrapped around the outside of the straw bundle of the inner core layer, which can effectively improve the strength and further ensure that the entire inner core layer will not be deformed under greater pressure, thereby avoiding the reduction of drainage performance.

[0046] 3. The ecological concealed pipe drainage body utilizes the gap between two pieces of bamboo to construct a groove, and cooperates with the permeable filter cloth layer to form a guide channel, which can be used as an installation hole for the hose, which is very convenient; the ecological concealed pipe drainage body not only has the ability to drain water and salt, but also has the ability to prevent blockage and maintain and improve the air permeability of saline-alkali land, achieving multiple effects in saline-alkali land management.

[0047] 4. The application method of the ecological concealed pipe drainage structure for improving saline-alkali land proposed in the present invention has the advantages of convenient construction, green and environmental protection, easy maintenance, and increased soil permeability. It can solve the technical problems of cold soil, low ground temperature, slow soil warming and poor soil ventilation and permeability in saline areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 It is a structural front view of the drainage unit in the present invention.

[0050] Figure 2 yes Figure 1 Partial cross-sectional view of the structure of the central drainage unit.

[0051] Figure 3 yes Figure 1 Cross-sectional view of the drainage unit.

[0052] Figure 4 yes Figure 1 Schematic diagram of the structure after adjacent drainage units are assembled.

[0053] Figure 5 It is a schematic diagram of the structure when the first straw rope is wound on the inner core layer.

[0054] Figure 6 It is a structural cross-sectional view of a drainage unit with a central pipe and a hose.

[0055] Figure 7 It is a structural cross-section diagram of a drainage unit with an elevated floor.

[0056] Figure 8 yes Figure 7 Cross-sectional view of the drainage unit after installing the central pipe and hose.

[0057] Fig. 9 It is a top view of the hollow cells formed by the bamboo strips and the second straw rope structure.

[0058] Fig.10 It is a structural schematic diagram when adjacent central pipes are connected through pipe joints.

[0059] Fig.11 This is a schematic diagram of the structure of the ecological underground drainage pipe after it is laid in saline-alkali land.

[0060] Fig.12 It is a schematic diagram of the structure after the ecological concealed pipe drainage body is connected to the infiltration enhancement column.

[0061] Fig.13 It is a three-dimensional diagram of the structure of the short section.

[0062] Fig.14 yes Fig.12 Schematic diagram of the structure of the ecological underground drainage body and infiltration column in saline-alkali land.

[0063] Fig.15 It is a schematic diagram of the working status structure during saline-alkali land management.

[0064] Description of reference numerals:

[0065] 1. Drainage unit; 101. Inner core layer; 1011. First straw rope; 102. Skeleton layer; 103. Water-permeable filter cloth layer; 104. Guide channel; 105. Hose; 106. Center pipe; 107. Joint; 108. Cavity cell; 109. Second straw rope;

[0066] 2. Geotextile; 3. Pup joint; 31. Plug hole; 4. Infiltration column; 5. Collection well; 6. Drainage ditch; 7. Water pump; 8. Drain pipe; 9. Saline-alkali land; 10. Cultivated layer. DETAILED DESCRIPTION

[0067] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0069] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0070] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0071] Embodiment 1:

[0072] like Figure 1 - Figure 6 As shown, this embodiment proposes an ecological concealed pipe drainage structure for improving saline-alkali land, including a plurality of assembled and connected drainage units 1, wherein the drainage unit 1 mainly includes an inner core layer 101, a skeleton layer 102, a water-permeable filter cloth layer 103 and the like, which are described in detail below:

[0073] Part I:

[0074] The inner core layer 101 is located in the middle of the drainage unit 1; the cross-sectional shape of the inner core layer 101 is circular; the inner core layer 101 is a straw bundle, which is formed by bundling a number of straws; the straw bundle can be one or more of wheat straw, rice straw, reed straw, etc. The straw bundle can adsorb and intercept nitrogen and phosphorus, so that nitrogen and phosphorus are retained in the soil, and the water flow without nitrogen and phosphorus flows into the drainage ditch 6 or the water collection well 5 through the gaps between the straws. Part II:

[0075] The skeleton layer 102 is sleeved on the inner core layer 101 to form a skeleton support, which can effectively prevent the straw bundle from being deformed too much after being subjected to pressure, and play a role in enhancing strength; the skeleton layer 102 includes two pairs of bamboo pieces, and the bamboo pieces are provided with a plurality of penetration holes around the bamboo pieces, and the penetration holes are used to provide a flow-through effect; the bamboo pieces are formed by splitting a bamboo tube with a circular cross-section into two; the inner diameter of the bamboo tube is smaller than the outer diameter of the straw bundle; in this way, when the two bamboo pieces are buckled on the inner core layer 101, a groove is formed between the two bamboo pieces along the length direction of the bamboo pieces.

[0076] Part III:

[0077] The water-permeable filter cloth layer 103 is wound around the skeleton layer 102, and the skeleton layer 102 and the inner core layer 101 are bundled and wrapped as a whole; the water-permeable filter cloth layer 103 surrounds the groove to form a guide channel 104. In this embodiment, the water-permeable filter cloth layer 103 adopts a degradable non-woven geotextile 2.

[0078] As a feasible embodiment, Figure 5 As shown, the inner core layer 101 further includes a first straw rope 1011, which is tightly wound around the straw bundle to form a support reinforcement layer. The first straw rope 1011 is made of hemp rope, straw rope or straw rope, which can effectively improve the strength and further ensure that the entire inner core layer 101 will not deform under greater pressure, thereby avoiding a decrease in drainage performance.

[0079] After the effective use period of the drainage unit 1 proposed by the present invention ends, the straw bundles and / or bamboo pieces rot into organic matter in the soil, which helps to increase soil nutrients.

[0080] When the drainage units 1 are spliced ​​and assembled, adjacent drainage units 1 are assembled by winding and bundling, for example, by winding the geotextile 2 .

[0081] As a feasible embodiment, a central tube 106 is provided at the center of the inner core layer 101. The central tube 106 is arranged along the length direction of the drainage unit 1, and a plurality of first micropores are arranged along the tube body of the central tube 106. When processing and manufacturing the straw bundle, the central tube 106 is directly pre-buried in the center of the straw bundle to achieve assembly. When in use, the central tube 106 can be used as a negative pressure tube. One end of the central tube 106 is connected to a negative pressure generator. When the negative pressure generator is working, the central tube 106 generates negative pressure. Under the action of this negative pressure, saline-alkali water can smoothly flow into the inner core layer 101, which can reduce the resistance of soil moisture entering the concealed pipe.

[0082] As a feasible embodiment, a hose 105 is provided in the guide channel 104, and a plurality of second micro-holes are arranged on the hose 105. The use of the hose 105 is further described below.

[0083] Working principle:

[0084] The ecological concealed pipe drainage body designed by the present invention adopts green natural materials to form an ecological composite structure of "straw bundles + bamboo slices + permeable filter cloth layer 103". The bamboo slices are used to construct the skeleton layer 102, which has a good supporting effect and prevents the internal straw bundles from being squeezed densely under pressure. The gaps between the straws can form channels for drainage, so that the water permeability is not reduced, thereby ensuring the soil drainage effect. It is low in price, rich in materials, simple in construction, pollution-free to the environment, and has significant economic, social and ecological environmental benefits.

[0085] The ecological concealed pipe drainage body utilizes the gap between two pieces of bamboo to construct a groove, and cooperates with the permeable filter cloth layer 103 to form a guide channel 104. The guide channel 104 can be used as an installation hole for the hose 105, which is very convenient. The ecological concealed pipe drainage body not only has the ability to drain water and salt, but also has the ability to prevent blockage and maintenance and improve the air permeability of saline-alkali land 9, achieving multiple effects in the management of saline-alkali land 9.

[0086] Embodiment 2:

[0087] like Figure 7 - Fig. 9 As shown, based on the embodiment 1, the drainage unit 1 proposed in this embodiment also has the following structure:

[0088] An overhead layer is also provided on the outer surface of the upper bamboo piece. In the present embodiment, the overhead layer comprises a second straw rope 109, which may be made of materials such as rice straw rope and wheat straw rope. The second straw rope 109 is divided into a plurality of rope segments, which are affixed to the surface of the bamboo piece in an interval arrangement. The water-permeable filter cloth layer 103 wraps and presses the rope segments. A cavity cell 108 is formed between adjacent rope segments, and the cavity cell 108 is communicated with the guide channel 104.

[0089] The overhead layer designed in the ecological concealed pipe drainage body uses the second straw rope 109 to construct a cavity cell 108 on the surface of the bamboo slices. The cavity cell 108 can facilitate the penetration of saline water and reduce the resistance of water entering the ecological concealed pipe drainage body. Therefore, the present invention eliminates the resistance of soil moisture entering the concealed pipe to the greatest extent. Due to the difference in water conductivity between the overhead layer and the soil, the water in the soil is easily collected in the overhead layer and drained to the inner core layer 101 through the overhead layer, so that the normal drainage can be ensured. In addition, the overhead layer is located above the drainage body, which can ensure that the water is collected above the drainage body, so that a local saturated area is generated above the drainage body, forcing the water to enter the inner core layer 101 through the bamboo slices, thereby improving the drainage efficiency; when the soil water is in an unsaturated state, the soil water can still be collected at the concealed pipe and discharged from the concealed pipe, ensuring the normal drainage of the concealed pipe.

[0090] In this embodiment, the drainage units 1 are connected by short sections 3, and the two ends of the short sections 3 are respectively plugged and fixed with the drainage units 1 on both sides. The short sections 3 can be made of bamboo tubes, and bamboo tubes of appropriate diameter are selected. The two ends of the drainage unit 1 are wrapped with geotextiles 2 of appropriate thickness to form a flexible plug connector 107, and then the flexible plug connector 107 is inserted into the bamboo tube to complete the plug connection. The flexible plug connector 107, on the one hand, utilizes its deformation ability to facilitate filling the gap, so that the flexible plug connector 107 has a good fit with the inner wall of the bamboo tube to prevent leakage; on the other hand, the bamboo tube is a natural material, green and environmentally friendly, and when it rots, it can increase soil fertility.

[0091] In this embodiment, the short section 3 is provided with a plug hole 31, and the plug hole 31 is used to realize the assembly connection between the vertically arranged permeability enhancement column 4 and the horizontally arranged short section 3. The permeability enhancement column 4 in this embodiment can adopt the drainage unit 1 in Example 1. When the drainage unit 1 in Example 1 is used vertically, it serves as a permeability enhancement column 4, which can dissolve and clean the salt in the soil near the root system to the greatest extent. Finally, the leached salt water is accelerated to move downward through the permeability enhancement column 4 and is taken away through the ecological underground drainage body.

[0092] Embodiment 3:

[0093] like Fig.10 - Fig.11 As shown, this embodiment proposes an application method of an ecological concealed pipe for saline-alkali land improvement, which is used for saline-alkali land management. The ecological concealed pipe drainage structure for saline-alkali land improvement proposed in Example 1 is adopted, and the steps included are as follows:

[0094] S1: Land leveling;

[0095] S2: Determine the layout parameters and plans according to the soil physical and chemical properties, basic data and specifications of saline-alkali land 9;

[0096] S3: Processing and manufacturing ecological concealed pipe drainage bodies;

[0097] S4: Installation:

[0098] A drainage ditch 6 is dug at the designed location, an ecological underground drainage body is laid, and a water collection well 5 is installed; the ecological underground drainage body is connected to the water collection well 5, and the diverted saline-alkali water is discharged into the water collection well 5; a pump 7 is arranged in the water collection well 5, and the drainage outlet of the pump 7 is connected to the drainage ditch 6, so that the salt water in the water collection well 5 is lifted and discharged;

[0099] S5: Planting crops on saline-alkali land9;

[0100] S6: Soil salt leaching:

[0101] Using rainfall or irrigation to wash the saline-alkali land 9, washing the salt from the upper soil layer to the lower soil layer;

[0102] S7: Drainage and salt removal: Soil water containing leached salts infiltrates into the ecological underground drainage body, and is collected by the ecological underground drainage body into the water collection well 5, and is discharged to the drainage ditch 6 by the water pump 7 in the water collection well 5, thereby reducing the soil salt content.

[0103] In this method, taking an ecological concealed pipe drainage body without an overhead layer as an example, the specific method for processing and manufacturing the ecological concealed pipe drainage body in S3 is as follows:

[0104] S31: preparing bamboo tubes, straws and a water-permeable filter cloth layer 103 that meet the requirements;

[0105] S32: Bundling the straw into bundles to form straw bundles, and cutting the straw bundles into required lengths using a cutting device to obtain an inner core layer 101;

[0106] S33: cutting the bamboo tube into two parts to obtain bamboo pieces that meet the requirements; then using a drilling tool to drill holes around the bamboo pieces to form penetration holes to obtain a skeleton layer 102;

[0107] S34: The skeleton layer 102 formed by two bamboo pieces is sleeved on the inner core layer 101; a groove is formed between the two bamboo pieces along the length direction of the bamboo pieces;

[0108] S35: Wrap the water-permeable filter cloth layer 103 on the skeleton layer 102, and wrap the skeleton layer 102 and the inner core layer 101 together; the water-permeable filter cloth layer 103 surrounds the slot to form a guide channel 104; thus, a set of drainage units 1 is formed;

[0109] S36: A pull rope is respectively inserted into the guide channel 104 of each set of drainage units 1, and both ends of the pull rope extend to the outside of the drainage unit 1, with sufficient margin;

[0110] S37: Splice multiple drainage units 1 end to end to form an ecological concealed pipe drainage body; when splicing, tie the pull ropes corresponding to each drainage unit 1 to form a whole; in this way, a complete traction rope is formed in the guide channel 104; it should be noted that, if Fig.10 As shown, if an inner core layer 101 with a central tube 106 is used, a joint 107 is used to connect the central tube 106 during assembly. The joint 107 is made of a hard material, and both ends of the joint 107 can be inserted into adjacent central tubes 106 to achieve a plug-in connection.

[0111] S38: Tie the hose 105 at one end of the traction rope, and then drag the other end of the traction rope. As the traction rope moves, the hose 105 is driven to move from one end of the guide channel 104 to the other end, thereby realizing the threading and connection of the hose 105. After the threading is completed, release the connection between the traction rope and the hose 105 to form an ecological concealed pipe drainage body with the hose 105.

[0112] It should be noted that if an ecological concealed pipe drainage body with an overhead layer is selected, then on the basis of the above-mentioned manufacturing method, it also includes: S34a, cutting the second straw rope 109 to form multiple rope segments, and attaching the rope segments to the surface of the bamboo pieces in an intermittent manner; the step in S35 is replaced by: winding the water-permeable filter cloth layer 103 around the skeleton layer 102 and the rope segment surface, and wrapping the skeleton layer 102, the inner core layer 101, and the rope segment as a whole; the water-permeable filter cloth layer 103 surrounds the groove to form a guide channel 104; at this point, a group of drainage units 1 is formed.

[0113] The above-mentioned application method of the ecological underground pipe for improving saline-alkali land also includes S8: anti-blocking maintenance of the ecological underground pipe drainage body and improvement of the air permeability of saline-alkali land 9, which are as follows:

[0114] ① The methods for preventing and maintaining ecological concealed pipe drainage bodies are:

[0115] The flushing equipment is installed around the water collection well 5, and the flushing equipment can be selected from common devices on the market; the water outlet of the flushing equipment is connected to one end of the hose 105 through a water pipe; the flushing equipment is started, and the water flows through the hose 105 and flows in the reverse direction along the ecological concealed pipe drainage body, and is ejected through the second micropore of the hose 105 during the flow, forming a jet in the guide channel 104, which plays a pressurizing role, and can realize the cleaning of the ecological concealed pipe drainage body and achieve anti-blocking cleaning; in the present embodiment, as another feasible method, the flushing equipment can also be connected to the central pipe 106, and the central pipe 106 is used as a cleaning pipe at this time, and water flows through the first micropore on the central pipe 106 to eject, so as to realize the backwashing of the straw bundle and reduce blockage; the central pipe 106 is used in conjunction with the hose 105 to form an anti-blocking method of "center cleaning + side cleaning", which can effectively realize the anti-blocking maintenance of the ecological concealed pipe drainage body.

[0116] ② The method of improving the air permeability of saline-alkali land 9 is:

[0117] The gas supply equipment is installed around the water collection well 5, and the gas outlet of the gas supply equipment is connected to one end of the hose 105 through the air pipe; the gas supply equipment is started, and the gas flows in reverse along the ecological dark pipe drainage body through the hose 105, and is ejected through the second micropore of the hose 105 during the flow, forming a gas jet in the guide channel 104, achieving oxygenation treatment of the saline-alkali land 9 soil, and improving the soil temperature and air permeability. In this embodiment, the central tube 106 can also be connected to the gas supply equipment, and the gas supply equipment is started, and the gas flows in reverse along the ecological dark pipe drainage body through the central tube 106, and is ejected through the first micropore of the central tube 106 during the flow, forming a gas jet, achieving oxygenation treatment of the saline-alkali land 9 soil, and can also increase the ground temperature and air permeability, which can solve the technical problems of cold soil, low ground temperature, slow soil warming and poor soil ventilation and air permeability in saline areas.

[0118] Embodiment 4:

[0119] like Fig.12 - Fig.15 As shown, this embodiment proposes another application method of an ecological concealed pipe drainage structure for improving saline-alkali land, which includes the following steps:

[0120] S1: Land leveling;

[0121] S2: Determine the layout parameters and plans based on soil physical and chemical properties, basic data and plot specifications;

[0122] S3: Processing and manufacturing ecological concealed pipe drainage bodies and infiltration columns 4; in this embodiment, the infiltration column 4 adopts the structure of the infiltration column 4 in embodiment 2;

[0123] S4: Installation:

[0124] A drainage ditch 6 is dug at the designed location, an ecological underground drainage body is laid, and a water collection well 5 is installed; the ecological underground drainage body is connected to the water collection well 5, and the diverted saline-alkali water is discharged into the water collection well 5; a pump 7 is arranged in the water collection well 5, and the drainage outlet of the pump 7 is connected to the drainage ditch 6, so that the salt water in the water collection well 5 is lifted and discharged;

[0125] When installing and constructing the ecological concealed pipe drainage body and the infiltration column 4, the following steps are adopted:

[0126] First, dig the trench, then assemble the drainage units 1, and use short sections 3 to connect the nodes at appropriate locations; the connection nodes at other locations can be wrapped with geotextile 2, please refer to the attached Fig.14 The plug hole 31 of the short section 3 is connected with the permeability enhancing column 4. When installing the permeability enhancing column 4, the geotextile 2 can be wrapped around the outer wall of the lower end of the permeability enhancing column 4 to form a connector 107 of a certain thickness, which is then inserted into the plug hole 31 to achieve an effective fixed connection; the top of the permeability enhancing column 4 is wrapped and capped with non-woven fabric.

[0127] In addition, if the original saline-alkali land 9 has low fertility, a layer of improved soil or foreign soil can be covered on the surface of the original saline-alkali land 9 to form a cultivation layer 10. Straw debris can be mixed into the improved soil, and the straw is returned to the field to improve soil quality and promote the growth of crops.

[0128] S5: Select appropriate crops and plant them on the plots based on the physical and chemical properties of the soil;

[0129] S6: Soil salt leaching:

[0130] Using rainfall or irrigation to wash the saline-alkali land 9, washing the salt from the upper soil layer to the lower soil layer;

[0131] S7: Drainage and salt removal: Soil water containing leached salts infiltrates into the ecological underground drainage body, and is collected into the water collection well 5 by the ecological underground drainage body, and is discharged to the drainage ditch 6 by the pump 7 in the water collection well 5, thereby reducing the salt content of the soil. The outlet of the pump 7 is connected to a drainage pipe 8, and the outlet of the drainage pipe 8 is located at the drainage ditch 6.

[0132] In this method, when draining salt, the infiltration column 4 can dissolve and clean the salt in the soil near the root system to the greatest extent, and the washed salt water is finally accelerated to move downward through the infiltration column 4 and taken away through the ecological hidden pipe drainage body. In addition, when the salt is not drained, the guide channel 104 set in the infiltration column 4 can transport fresh oxygen to the crop root system, providing sufficient oxygen for the crop root system.

[0133] The present invention is applied to the improvement and efficient green drainage projects of saline-alkali land in the Yellow River diversion irrigation areas such as the lower reaches of the Yellow River and the Yellow River Delta. It can be used to guide the design, construction and management of the irrigation and drainage system of saline-alkali land. It can solve the problems of low drainage capacity of saline-alkali land, poor precipitation and alkali-removal effect, and high investment. It is of great significance to improve the precipitation and alkali-removal level of saline-alkali land in the Yellow River diversion irrigation areas and achieve the construction goal of ecological irrigation areas.

[0134] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An application method of an ecological underground drainage structure for saline-alkali land improvement, which is used for the treatment of saline-alkali land, and adopts an ecological underground drainage structure for saline-alkali land improvement, characterized in that: The ecological concealed pipe drainage structure for improving saline-alkali land comprises a plurality of assembled and connected drainage units (1), wherein the drainage units (1) comprise: An inner core layer (101), the inner core layer (101) being located in the middle of the drainage unit (1); the inner core layer (101) being a straw bundle, the straw bundle being formed by bundling a plurality of straws; A skeleton layer (102), the skeleton layer (102) being sleeved on the inner core layer (101) to form a skeleton support; the skeleton layer (102) comprising two pairs of bamboo pieces, the bamboo pieces being provided with a plurality of penetration holes around the bamboo pieces; the bamboo pieces being formed by splitting a bamboo tube having a circular cross section into two; the inner diameter of the bamboo tube being smaller than the outer diameter of the straw bundle; when the two bamboo pieces are buckled onto the inner core layer (101), a groove is formed between the two bamboo pieces along the length direction of the bamboo pieces; a water-permeable filter cloth layer (103), wherein the water-permeable filter cloth layer (103) is wound around the skeleton layer (102) to gather and wrap the skeleton layer (102) and the inner core layer (101) into a whole; the water-permeable filter cloth layer (103) surrounds the slot to form a guide channel (104); A central tube (106) is provided at the center of the inner core layer (101), the central tube (106) is arranged along the length direction of the drainage unit (1), and the central tube (106) is provided with a plurality of first micropores along the tube body; a hose (105) is provided in the guide channel (104), and the hose (105) is provided with a plurality of second micropores on the tube body; The application method comprises the following steps: S1: Land leveling; S2: Determine the layout parameters and plans based on the soil physical and chemical properties, basic data and specifications of the saline-alkali land (9); S3: Processing and manufacturing ecological concealed pipe drainage bodies; the specific method for processing and manufacturing ecological concealed pipe drainage bodies in S3 is as follows: S31: preparing bamboo tubes, straws and a water-permeable filter cloth layer (103) that meet the requirements; S32: bundling the straw into bundles to form straw bundles, and cutting the straw bundles into required lengths using a cutting device to obtain an inner core layer (101); S33: cutting the bamboo tube into two parts to obtain bamboo pieces that meet the requirements; then using a drilling tool to drill holes around the bamboo pieces to form penetration holes to obtain a skeleton layer (102); S34: a skeleton layer (102) composed of two bamboo pieces is sleeved on the inner core layer (101); a groove is formed between the two bamboo pieces along the length direction of the bamboo pieces; S35: Wrapping the water-permeable filter cloth layer (103) on the skeleton layer (102), and wrapping the skeleton layer (102) and the inner core layer (101) together; the water-permeable filter cloth layer (103) surrounds the slot to form a guide channel (104); thus, a set of drainage units (1) is formed; S36: A pull rope is respectively inserted into the guide channel (104) of each set of drainage units (1), with both ends of the pull rope extending outside the drainage unit (1) with sufficient margin; S37: Splicing the multiple drainage units (1) end to end to form an ecological concealed pipe drainage body; when splicing, tying the pull ropes corresponding to the drainage units (1) to form an integrated body; thus, a complete pulling rope is formed in the guide channel (104); S38: tying a hose (105) at one end of a traction rope, and then dragging the other end of the traction rope, and as the traction rope moves, the hose (105) is driven to move from one end of the guide channel (104) to the other end, thereby achieving the threading and connection of the hose (105); after the threading is completed, the connection between the traction rope and the hose (105) is released, and an ecological concealed pipe drainage body with a hose (105) is formed. S4: Installation: A drainage ditch (6) is dug at the designed location, an ecological underground drainage body is laid, and a water collection well (5) is installed; the ecological underground drainage body is connected to the water collection well (5) to discharge the diverted saline-alkali water into the water collection well (5); a pump (7) is arranged in the water collection well (5), and the drainage outlet of the pump (7) is connected to the drainage ditch (6) to lift up and discharge the salt water in the water collection well (5); S5: Planting crops on saline-alkali land (9); S6: Soil salt leaching: Using rainfall or irrigation to wash saline-alkali land (9) and wash the salt from the upper soil layer to the lower soil layer; S7: Drainage and salt removal: Soil water containing leached salts infiltrates into the ecological underground drainage body, is collected by the ecological underground drainage body into the water collection well (5), and is discharged to the drainage ditch (6) by the pump (7) in the water collection well (5), thereby reducing the soil salt content; S8: Anti-blocking maintenance of ecological underground drainage and improvement of air permeability of saline-alkali land (9); ① The methods for preventing and maintaining ecological concealed pipe drainage bodies are: The flushing device is installed around the water collection well (5), and the water outlet of the flushing device is connected to one end of the hose (105) through a water pipe; the flushing device is started, and water flows through the hose (105) and flows in the reverse direction along the ecological hidden pipe drainage body, and is ejected through the second micropore of the hose (105) during the flow process, forming a jet in the guide channel (104), which plays a pressurizing role, can achieve cleaning of the ecological hidden pipe drainage body, and achieve anti-blocking cleaning; ② The methods for improving the air permeability of saline-alkali land (9) are: The gas supply device is installed around the water collection well (5), and the gas outlet of the gas supply device is connected to one end of the hose (105) through the air pipe; the gas supply device is started, and the gas flows in the reverse direction along the ecological concealed pipe drainage body through the hose (105), and is ejected through the second micropore of the hose (105) during the flow process, forming a gas jet in the guide channel (104), thereby achieving oxygenation treatment of the saline-alkali land (9) soil and improving the soil temperature and air permeability.

2. The application method of the ecological concealed pipe drainage structure for improving saline-alkali land according to claim 1 is characterized in that: The inner core layer (101) further comprises a first straw rope (1011), wherein the first straw rope (1011) is wound around the straw bundle in a tightly arranged manner to form a supporting and reinforcing layer.

3. The application method of the ecological concealed pipe drainage structure for improving saline-alkali land according to claim 1 is characterized in that: The drainage units (1) are connected via short sections (3), and the two ends of the short sections (3) are respectively plugged and fixed to the drainage units (1) on both sides.

4. The application method of the ecological concealed pipe drainage structure for improving saline-alkali land according to claim 3 is characterized in that: The short section (3) is provided with a plug-in hole (31), and the plug-in hole (31) is used to realize an assembly connection between a vertically arranged permeability enhancement column (4) and a horizontally arranged short section (3).

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