Saline-alkali soil improvement structure

Abstract

A saline-alkali soil improvement structure is characterized in that a water-resisting layer, a gravel layer and a fine sand layer are sequentially laid underground the saline-alkali soil from bottom to top, a liquid pumping pipe set is arranged in the gravel layer in the horizontal direction, water pumping holes are formed in the pipe wall of the liquid pumping pipe set, and the liquid pumping pipe set is connected with a water pumping assembly on the outer side of the saline-alkali soil through a first connecting pipe; a seepage pipe set is arranged between the gravel layer and the upper portion of the saline-alkali soil, water outlet holes are formed in the pipe wall of the seepage pipe set, and the seepage pipe set is arranged in the horizontal direction and connected with a water supply assembly on the outer side of the saline-alkali soil through a second connecting pipe. The broken stones of the broken stone layer are provided with larger gaps, so that the saline-alkali water is convenient to gather, the liquid pumping pipe group is convenient to pump water, and the phenomena that water pumping holes cannot be immersed in the saline-alkali water and liquid cannot be pumped, and a water absorption branch pipe in the prior art is directly arranged in the saline-alkali soil and is easy to be blocked by soil and affects water absorption are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of saline-alkali land improvement, in particular to a saline-alkali land soil improvement structure. Background Art

[0002] The salt-alkali land has a high salt-alkali content and almost no plants can grow. It is necessary to improve the saline-alkali land to improve the land utilization rate. The existing technology for improving saline-alkali land mostly improves it by flushing. For example, the existing patent number is CN214430010U, which is a saline-alkali land anti-alkali improvement structure, including a soil washing main pipe for water discharge and a water suction branch pipe for extracting salt wastewater. The water suction branch pipe is arranged above the soil washing main pipe, and the water suction branch pipe is provided with a plurality of water suction holes. The water suction branches of this structure are all vertically arranged in the saline-alkali land. When the soil is flushed with an improver, the improver will flow to both sides and downward through the soil washing branch pipe, which is not convenient for the upper water suction branch pipe to extract the salt wastewater. Utility Model Content

[0003] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a saline-alkali soil improvement structure.

[0004] The technical solution of this utility model is as follows:

[0005] A saline-alkali soil improvement structure, comprising a water-proof layer, a gravel layer and a fine sand layer which are laid in sequence from bottom to top below the surface of the saline-alkali land, a liquid pumping pipe group is arranged in the gravel layer in a horizontal direction, a pipe wall of the liquid pumping pipe group is provided with a water pumping hole, and the liquid pumping pipe group is connected to a water pumping assembly outside the saline-alkali land through a first connecting pipe;

[0006] A seepage pipe group is arranged between the gravel layer and the upper surface of the saline-alkali land. The pipe wall of the seepage pipe group is provided with water outlet holes. The seepage pipe group is arranged in a horizontal direction and is connected to a water supply component arranged on the upper surface of the saline-alkali land through a second connecting pipe.

[0007] A waterproof layer is set at a certain depth inside the saline-alkali land. The waterproof layer serves to prevent the saline-alkali land below from returning alkali upward, and has the effect of reducing salinity and alkali in the saline-alkali land above the waterproof layer and improving the soil. The saline-alkali land improvement method above the waterproof layer is as follows: the saline-alkali land is irrigated with improvement liquid through the seepage pipe group. The improvement liquid can dilute the salt content of the saline-alkali land. The mixed saline-alkali water flows downward to the gravel layer and the waterproof layer in turn. Due to the barrier effect of the waterproof layer, the saline-alkali water will accumulate in the gravel layer and slowly accumulate upward. The saline-alkali water in the gravel layer is then pumped out through the pumping pipe group set in the gravel layer. Because the gravel layer is formed by laying a number of gravels, it has a certain water storage space, which makes it easy for the pumping holes of the pumping pipe group to be completely immersed in the saline-alkali water, preventing the pumping component from failing to pump and drain water normally.

[0008] The specific structure of the above-mentioned liquid pumping pipe group is that the liquid pumping pipe group includes multiple connected liquid pumping pipes, the liquid pumping pipes are arranged close to the aquiclude, and the pumping holes are arranged on the liquid pumping pipes. Due to the limited thickness of the gravel layer, multiple liquid pumping pipes are arranged in the horizontal direction and are located in the same horizontal plane. In order to facilitate the complete immersion of the pumping holes of the liquid pumping pipes in the saline water, improve the pumping and drainage efficiency, and reduce the phenomenon that the pumping holes cannot pump and drain water normally due to the air being pumped into the pumping holes, the pumping holes are arranged at the lower part of the gravel layer, and the pumping holes cannot be too close to the aquiclude. The aquiclude or the sludge in the aquiclude may block the pumping holes. For this reason, the pumping holes are arranged at a certain distance from the aquiclude, and the vertical distance between the pumping holes and the aquiclude is set to 5-10 cm.

[0009] Although the above-mentioned liquid extraction pipe is arranged at the lower part of the gravel layer, the pumping effects are different when the pumping holes are arranged at the upper and lower parts of the liquid extraction pipe. The pumping holes arranged at the upper part of the liquid extraction pipe will not be able to extract the saline-alkali water located below the pumping holes. Therefore, in order to increase the discharge of more saline-alkali water from the liquid extraction pipe and improve the improvement effect of the saline-alkali land, the pumping holes are arranged at the lower part of the liquid extraction pipe and close to the aquiclude.

[0010] If the thickness of the above-mentioned gravel layer is too thin, it is not convenient to bury the pumping pipe, and if the gravel layer is too thick, the cost of landfilling the gravel layer will increase. Therefore, the thickness of the gravel layer is set to 10-40 cm.

[0011] The specific structure of the above-mentioned seepage pipe group is that multiple seepage pipe groups are connected and arranged in parallel up and down, so that the salt in the saline-alkali land above the waterproof layer can be fully diluted, and a single seepage pipe group includes multiple seepage pipes connected and arranged.

[0012] In order to facilitate the extraction of saline-alkali water by the extraction pipe quickly, the extraction pipe group and the adjacent seepage pipe group are arranged correspondingly.

[0013] In order to facilitate the water in the seepage pipe to fully dilute a larger area of ​​saline-alkali land and increase the path of water flowing to the gravel layer and the extraction pipe, the direction of the extraction pipe group is staggered with the direction of the adjacent seepage pipe group, which can extend the time for the water in the seepage pipe to flow to the gravel layer and improve the dilution effect of water on the saline-alkali land.

[0014] The aquiclude is set at a depth of 50-100cm underground in saline-alkali land. If the aquiclude is buried too shallowly, it will be inconvenient to set up a gravel layer and a pumping pipe. If the aquiclude is buried too deep, the burial cost will be greatly increased.

[0015] The waterproof layer mentioned above is a geomembrane, which will not cause alkali back to the saline-alkali land below.

[0016] The above-mentioned saline-alkali water is directly collected into a collection pool after being pumped out by the pumping component and discharged to a designated place, which will cause a waste of water resources. In order to reduce the waste of water resources and improved liquid, a reverse osmosis device is arranged outside the saline-alkali land. The water inlet pipe of the reverse osmosis device is connected to the water outlet of the pumping component, and the water outlet pipe is connected to the water inlet of the water supply component. After the saline-alkali water pumped out by the pumping component is filtered by the reverse osmosis device, it is sent to the seepage pipe group through a water pump, and then discharged into the saline-alkali land through the seepage pipe of the seepage pipe group, so as to dilute the salt content of the saline-alkali land and reduce the waste of water resources and improved liquid.

[0017] The beneficial effects of the utility model are:

[0018] The aquiclude can be set at a certain depth underground according to the specific geological conditions of the saline-alkali land, and the aquiclude is arranged in a horizontal direction. The aquiclude and the gravel layer are used to prevent the saline-alkali land below the aquiclude from returning alkali upward. Improved liquid is infiltrated into the saline-alkali land above the aquiclude through the seepage pipe group to dilute the salt in the saline-alkali land. After that, the diluted saline-alkali water flows downward to the gravel layer and the aquiclude. The gravel layer is formed by laying a number of gravels. The gravel layer is provided with a liquid extraction pipe group, and the saline-alkali water located in the gravel layer is extracted through the liquid extraction pipe group. Compared with the setting position of the water suction branch pipe in the prior art, the gravels in the gravel layer of the utility model have larger gaps, which is convenient for the gathering of saline-alkali water and also convenient for the liquid extraction pipe group to extract water;

[0019] The water absorption branch pipe in the prior art is arranged vertically and has a plurality of water absorption holes. The saline-alkali water is unevenly distributed in the vertical direction, and not all the vertically distributed water absorption holes can absorb the saline-alkali water. If there are more water absorption holes located above the water absorption branch pipe that are in direct contact with the air or soil, it will affect the water absorption phenomenon of the water absorption holes below the water absorption branch pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the attached picture:

[0021] Figure 1 It is a structural schematic diagram;

[0022] Figure 2 It is a partial structural schematic diagram of the liquid extraction tube group and the liquid seepage tube group;

[0023] Figure 3 for Figure 1 The enlarged structural diagram at A in the middle;

[0024] The components represented by the reference numerals in the figure are:

[0025] 1. Saline-alkali land; 2. Water-proof layer; 3. Gravel layer; 4. Pumping pipe; 41. Pumping hole; 5. Pumping assembly; 6. First connecting pipe; 7. Seepage pipe; 8. Second connecting pipe; 9. Water supply assembly; 10. Reverse osmosis equipment; 11. Fine sand layer; 12. Filter net. DETAILED DESCRIPTION

[0026] like Figure 1 A saline-alkali soil improvement structure is shown. According to the improved area of ​​saline-alkali land 1, a waterproof layer 2 is laid horizontally underground in the saline-alkali land 1. The waterproof layer 2 is a geomembrane. A crushed stone layer 3 is laid on the waterproof layer 2. A liquid pumping pipe group is arranged horizontally in the crushed stone layer 3. The pipe wall of the liquid pumping pipe group is provided with a pumping hole. The liquid pumping pipe group is connected to the pumping assembly 5 outside the saline-alkali land 1 through a first connecting pipe 6. The pumping assembly 5 can be a pumping pump. The first connecting pipe 6 is vertically buried in the saline-alkali land. Among them, the vertical spacing between the waterproof layer 2 and the upper end of the saline-alkali land 1 is 50-100 cm. If the waterproof layer 2 is buried too shallowly, it is not convenient to set the crushed stone layer 3 and the liquid pumping pipe. If the waterproof layer 2 is buried too deep, the burial cost will be greatly increased. The thickness of the above-mentioned gravel layer 3 is too thin and it is not convenient to bury the extraction pipe. The thickness of the gravel layer 3 is too thick, which increases the cost of filling the gravel layer 3. Therefore, the thickness of the gravel layer 3 is set to 10-40 cm. In order to reduce the soil being washed into the gravel layer 3 by water, resulting in the gravel layer 3 being filled with soil, a fine sand layer 11 is laid above the gravel layer 3. The fine sand layer 11 can filter the saline-alkali water diluted by the saline-alkali land above into the gravel layer, making it convenient for the extraction pipe group of the gravel layer 3 to extract the saline-alkali water.

[0027] The specific structure of the above-mentioned liquid extraction pipe group is that the liquid extraction pipe group includes a plurality of liquid extraction pipes 4 connected to each other, and the water extraction holes are arranged on the liquid extraction pipes 4. The water extraction holes are opened on the pipe wall of the liquid extraction pipes 4, which is a prior art and will not be described in detail here. Due to the limited thickness of the gravel layer 3, a plurality of liquid extraction pipes 4 are arranged in the horizontal direction and are located in the same horizontal plane. In order to facilitate the complete immersion of the water extraction holes of the liquid extraction pipes 4 in the saline water, improve the pumping and drainage efficiency, and reduce the phenomenon that the water extraction holes are sucked into the air, so that the water extraction assembly 5 cannot be pumped and drained normally, the water extraction holes are arranged at the lower part of the gravel layer 3. The water extraction holes cannot be too close to the water-proof layer 2, and the water-proof layer 2 or the sludge in the water-proof layer 2 may block the water extraction holes. For this reason, the water extraction holes are arranged at a certain distance from the water-proof layer 2, and the vertical distance between the water extraction holes and the water-proof layer 2 is set to be 5-10 cm. Although the above-mentioned liquid extraction pipe 4 is arranged at the lower part of the gravel layer 3, the pumping effects of the pumping holes arranged at the upper and lower parts of the liquid extraction pipe 4 are different. The pumping hole arranged at the upper part of the liquid extraction pipe 4 will not be able to extract the saline-alkali water located below the pumping hole. Therefore, in order to increase the ability of the liquid extraction pipe 4 to discharge more saline-alkali water and improve the improvement effect of the saline-alkali land 1, the pumping hole is arranged at the lower part of the liquid extraction pipe 4 and is close to the waterproof layer 2.

[0028] The aquiclude 2 is set at a certain depth underground in the saline-alkali land 1. The depth of the aquiclude 2 is selected according to the geology of the saline-alkali land 1. The aquiclude 2 is arranged in a horizontal direction. The aquiclude 2 serves to block the alkali return of the saline-alkali land 1 below, and serves to reduce salt and alkali in the saline-alkali land 1 above the aquiclude 2 and improve the soil. The improvement method of the saline-alkali land 1 above the aquiclude 2 is as follows: water is infiltrated into the saline-alkali land 1 above the aquiclude 2 through a seepage pipe group to dilute the salt in the saline-alkali land 1. After that, the diluted saline-alkali water flows downward to the gravel layer 3 and the aquiclude 2 in sequence. The gravel layer 3 is formed by laying a number of gravels. Due to the barrier effect of the aquiclude 2, the saline-alkali water will accumulate in the gravel layer 3 and slowly accumulate upward. The gravel layer 3 is provided with a liquid extraction pipe group, and the saline-alkali water located in the gravel layer 3 is extracted through the liquid extraction pipe group. Compared with the setting position of the water absorption branch pipe in the prior art, the gravel of the gravel layer 3 of the utility model has a larger gap, which is convenient for the saline-alkali water to gather and also convenient for the liquid extraction pipe group to extract liquid, thereby reducing the phenomenon that the water extraction hole cannot be immersed in the saline-alkali water and the liquid cannot be extracted. In addition, the water absorption branch pipe in the prior art is directly set in the saline-alkali land 1, which is easily blocked by the soil, affecting the water absorption phenomenon, such as Figure 3 As shown, in order to reduce the blockage of the water extraction hole, the utility model can be provided with a filter screen 12 on the outer side of the liquid extraction pipe 4, so that the filter screen 12 covers the water extraction hole.

[0029] In order to facilitate the dilution of the salt in the saline-alkali land above the gravel layer 3, a seepage pipe group is arranged between the gravel layer 3 and the upper part of the saline-alkali land 1. The pipe wall of the seepage pipe group is provided with a water outlet hole. The water outlet hole in the pipe wall is a prior art and will not be described here and is not shown in the figure. The seepage pipe group is arranged in the horizontal direction. The seepage pipe group is connected to the water supply component 9 outside the saline-alkali land 1 through the second connecting pipe 8. The water supply component 9 can be a water supply pump. The second connecting pipe 8 is vertically buried in the saline-alkali land. The specific structure of the above-mentioned seepage pipe group is that a plurality of seepage pipe groups are connected and arranged, and the plurality of seepage pipe groups are arranged in parallel up and down, so that the salt in the saline-alkali land 1 above the aquiclude 2 can be fully diluted, and a single seepage pipe group includes a plurality of seepage pipes 7 that are connected and arranged. In order to facilitate the extraction of saline water by the extraction pipe 4, one arrangement of the extraction pipe group and the seepage pipe group is that the extraction pipe group is arranged corresponding to one layer of the seepage pipe group, and the extraction pipe 4 is arranged in parallel with the seepage pipe 7. (See Figure 2 )

[0030] Another arrangement of the liquid extraction pipe 4 and the seepage pipe 7 is that the liquid extraction pipe group and the adjacent seepage pipe group are arranged alternately, which can extend the time for the improved liquid in the seepage pipe 7 to flow to the gravel layer 3, so that the improved liquid in the seepage pipe 7 can fully dilute the larger area of ​​saline-alkali land 1, increase the path for the improved liquid to flow to the gravel layer 3 and the liquid extraction pipe 4,

[0031] The above-mentioned saline-alkali water is directly collected into a collection pool after being pumped out by the pumping component 5, and is discharged to a designated place, which will cause a waste of water resources. In order to reduce the waste of water resources, a reverse osmosis device 10 is arranged outside the saline-alkali land 1. The water inlet pipe of the reverse osmosis device 10 is connected to the water outlet of the pumping component 5, and the water outlet pipe is connected to the water inlet of the water supply component 9. The saline-alkali water pumped out by the pumping component 5 is filtered by the reverse osmosis device 10, and then sent to the seepage pipe group by a water pump, and then discharged into the saline-alkali land 1 again through the seepage pipe 7 of the seepage pipe group, so as to dilute the salt content of the saline-alkali land 1 and reduce the waste of water resources.

Claims

1. A saline-alkali soil improvement structure, characterized in that: The invention comprises a water-proof layer (2), a gravel layer (3) and a fine sand layer (11) which are laid in order from bottom to top below the upper surface of the saline-alkali land (1); a liquid pumping pipe group is arranged in the horizontal direction in the gravel layer (3); a pipe wall of the liquid pumping pipe group is provided with a water pumping hole (41); the liquid pumping pipe group is connected to a water pumping assembly (5) arranged on the upper surface of the saline-alkali land (1) through a first connecting pipe (6); A seepage pipe group is arranged between the gravel layer (3) and the upper surface of the saline-alkali land (1), the pipe wall of the seepage pipe group is provided with a water outlet hole, the seepage pipe group is arranged in a horizontal direction, and the seepage pipe group is connected to a water supply component (9) arranged on the upper surface of the saline-alkali land (1) via a second connecting pipe (8).

2. A saline-alkali soil improvement structure according to claim 1, characterized in that: The liquid extraction pipe group comprises a plurality of liquid extraction pipes (4) which are connected and arranged, and the liquid extraction pipes (4) are arranged close to the water-proof layer (2).

3. The saline-alkali soil improvement structure according to claim 1, characterized in that: The water extraction hole (41) is arranged at the lower part of the liquid extraction pipe (4) and is arranged close to the water-proof layer (2).

4. The saline-alkali soil improvement structure according to claim 1, characterized in that: The thickness of the gravel layer (3) is 10-40 cm.

5. The saline-alkali soil improvement structure according to claim 1, characterized in that: The seepage pipe groups are arranged in a plurality and connected to each other. The plurality of seepage pipe groups are arranged in parallel up and down, and a single seepage pipe group includes a plurality of seepage pipes (7) that are arranged in a plurality and connected to each other.

6. A saline-alkali soil improvement structure according to claim 5, characterized in that: The liquid extraction tube group is arranged correspondingly to the adjacent liquid seepage tube group.

7. The saline-alkali soil improvement structure according to claim 1, characterized in that: The orientation of the liquid extraction tube group is staggered with the orientation of the adjacent liquid seepage tube group.

8. The saline-alkali soil improvement structure according to claim 1, characterized in that: The waterproof layer (2) is arranged at a depth of 50-100 cm underground in the saline-alkali land (1).

9. The saline-alkali soil improvement structure according to claim 1, characterized in that: The waterproof layer (2) is a geomembrane.

10. The saline-alkali soil improvement structure according to claim 1, characterized in that: A reverse osmosis device (10) is arranged outside the saline-alkali land (1), the water inlet pipe of the reverse osmosis device (10) is connected to the water outlet of the pumping component (5), and the water outlet pipe is connected to the water inlet of the water supply component (9).

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