Coastal heavy saline-alkali soil speed-increasing leaching seepage hole and mounting method

Abstract

The invention provides a coastal heavy saline-alkali soil speed-increasing leaching seepage hole and a mounting method, the coastal heavy saline-alkali soil speed-increasing leaching seepage hole comprises a plurality of seepage pipes and a plurality of negative pressure pipes, and the seepage pipes and the negative pressure pipes are arranged at intervals; the water seepage pipe comprises an impermeable water storage section and a water seepage section which are integrally formed, and the water seepage section is arranged below the impermeable water storage section. The saline-alkali soil leaching device has the advantages that the leaching permeation area of saline-alkali soil is increased by arranging the water seepage pipe, the leaching efficiency of the saline-alkali soil is improved by increasing the permeation area, and the water seepage pipe further has the function of collecting and storing water, reduces surface runoff and improves the water utilization efficiency. By arranging the negative pressure pipe, the transverse permeation pressure is increased, the transverse permeation rate of water is increased, the transverse leaching efficiency of the saline-alkali soil is improved, and the leaching uniformity of the saline-alkali soil is improved.

Description

Technical Field

[0001] The invention belongs to the field of saline-alkali land leaching, and in particular relates to a coastal heavy saline-alkali land speed-increasing leaching seepage hole and an installation method. Background Art

[0002] As an important component of difficult land, the existence of large areas of saline-alkali land has seriously restricted the rapid development of local economy and agriculture. Due to the formation of land reclamation in northern China, the saline-alkali land in the coastal areas has high clay and silt content, poor soil structure and poor soil permeability. In addition, due to the climatic characteristics of uneven rainfall distribution, a large amount of rainfall forms surface runoff without participating in the surface infiltration process, and the low natural leaching efficiency causes the saline-alkali land soil to be in a state of salt accumulation.

[0003] In order to improve the leaching efficiency of saline-alkali land, the existing technology adds large particles or porous materials such as sand and biochar into saline-alkali soil to increase the overall porosity of the soil to increase the permeability and enhance the leaching efficiency of saline-alkali soil. Mixing sand, biochar and other materials into the soil layer requires a huge amount of work, and the greater the amount of mixing, the better the leaching efficiency of saline-alkali soil. Better leaching efficiency requires higher cost investment, and the natural saline-alkali soil has a certain moisture content and high soil viscosity, which makes it difficult to mix evenly, resulting in a weakened leaching effect. Summary of the invention

[0004] In view of this, the present invention aims to propose a coastal heavy saline-alkali land speed-increasing leaching seepage hole and an installation method to solve at least one problem existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] In the first aspect, the present invention provides a coastal heavy saline-alkali land speed-increasing leaching seepage hole, including a plurality of seepage pipes and a plurality of negative pressure pipes, wherein the seepage pipes and the negative pressure pipes are arranged at intervals; the seepage pipes include an integrally formed impermeable water storage section and a seepage section, and the seepage section is arranged below the impermeable water storage section.

[0007] Furthermore, a plurality of water seepage holes are evenly opened on the surface of the water seepage section, and the outside of the water seepage section is also wrapped with a water-permeable non-woven fabric.

[0008] Furthermore, an air suction hole tube is provided at the top of the negative pressure tube, a plurality of air holes are evenly opened on the surface of the negative pressure tube, the outside of the negative pressure tube is also wrapped with a breathable non-woven fabric, and a check valve is also installed on the air suction hole tube.

[0009] Furthermore, the spacing between the seepage pipe and the negative pressure pipe is 4-6 meters.

[0010] In the second aspect, based on the same concept, the present invention also provides a method for installing a speed-increasing leaching hole in a coastal heavy saline-alkali land, comprising the following steps:

[0011] S1. Select the installation hole specifications of the seepage pipe and the negative pressure pipe and set the hole positions;

[0012] S2, drilling the installation holes;

[0013] S3. Install the seepage pipe and negative pressure pipe;

[0014] S4. Evacuate the negative pressure tube.

[0015] Furthermore, in step S1, selecting the installation hole specifications of the seepage pipe and the negative pressure pipe and setting the hole positions include:

[0016] The installation hole specifications are selected according to the required elution depth. The installation hole is a 6-10cm diameter perforated PVC pipe. The length of the installation hole is the elution depth minus 6-10cm. The length of the impermeable water storage section is 10-30% of the total length.

[0017] The installation holes are evenly arranged in the elution area in a field shape, and the seepage pipes and negative pressure pipes are arranged at intervals of 4-6 meters.

[0018] Furthermore, in step S2, drilling the mounting hole includes:

[0019] Use an installation drill to drill holes at the selected points, and choose a matching installation drill with a diameter of the pipe plus 3cm.

[0020] Furthermore, in step S3, the seepage pipe and the negative pressure pipe are installed, including:

[0021] Wrap the outer tube body of the water seepage pipe with a water-permeable non-woven fabric and then place it into the point hole of the water seepage pipe; wrap the outer tube body of the negative pressure pipe with a breathable non-woven fabric and then place it into the point hole of the negative pressure pipe;

[0022] Then fill the gap between the outer wall of the tube and the hole.

[0023] Furthermore, in step S4, the negative pressure tube is evacuated, including:

[0024] Connect the vacuum pump to the suction hole of the negative pressure tube, check the air tightness after connection, and after the air tightness is intact, extract some of the air in the negative pressure tube to generate negative pressure in the negative pressure tube.

[0025] Compared with the prior art, the coastal heavy saline-alkali land speed-increasing leaching seepage hole and installation method described in the present invention have the following advantages:

[0026] The invention discloses a coastal heavy saline-alkali land speed-increasing leaching seepage hole and installation method. The invention increases the leaching and permeation area of ​​saline-alkali land soil by setting a seepage pipe, and enhances the leaching efficiency of saline-alkali land by increasing the permeation area. The seepage pipe also has the function of collecting and storing water, reducing surface runoff, and enhancing water utilization efficiency. By setting a negative pressure pipe, the lateral permeation pressure is enhanced, the lateral permeation rate of water is increased, the lateral leaching efficiency of saline-alkali land is accelerated, and the leaching uniformity of saline-alkali land is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the installation of the water seepage pipe and the negative pressure pipe according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional schematic diagram of

[0030] Figure 3 A schematic diagram of a water seepage pipe according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a negative pressure tube according to an embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the drilling equipment described in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Seepage pipe; 11. Watertight water storage section; 12. Seepage section; 13. Seepage hole; 14. Water-permeable non-woven fabric; 2. Negative pressure pipe; 21. Air suction hole pipe; 22. Air hole; 23. Breathable non-woven fabric; 24. Check valve. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0039] like Figures 1 to 5 As shown, a coastal heavy saline-alkali land speed-increasing leaching seepage hole includes a plurality of seepage pipes 1 and a plurality of negative pressure pipes 2, wherein the seepage pipes 1 and the negative pressure pipes 2 are arranged at intervals; the seepage pipe 1 includes an integrally formed impermeable water storage section 11 and a seepage section 12, wherein the seepage section 12 is arranged below the impermeable water storage section 11.

[0040] A plurality of seepage holes 13 are evenly arranged on the surface of the water seepage section 12, and the outside of the water seepage section 12 is also wrapped with a water-permeable non-woven fabric 14; an air suction hole tube 21 is provided on the top of the negative pressure tube 2, and a plurality of air holes 22 are evenly arranged on the surface of the negative pressure tube 2, and the outside of the negative pressure tube 2 is also wrapped with a breathable non-woven fabric 23, and a check valve 24 is also installed on the air suction hole tube 21.

[0041] A coastal heavy saline-alkali land speed-up leaching seepage hole comprises two parts. The first part is a seepage pipe 1, which is used to increase the water infiltration area and increase the water infiltration efficiency; the second part is a negative pressure pipe 2, which is used to enhance the water lateral penetration pressure and increase the water infiltration efficiency.

[0042] This technology increases the infiltration area of ​​saline-alkali soil by setting water seepage holes, thereby increasing the leaching efficiency, and increases the lateral seepage pressure by setting negative pressure holes, thereby accelerating the lateral seepage speed of the soil and increasing the lateral leaching rate of saline-alkali land. The device installation method is simple and efficient, and the application cost is low.

[0043] A method for installing a speed-increasing leaching hole in coastal heavy saline-alkali land, with specific implementation steps and precautions:

[0044] like Figure 1 As shown, a method for installing accelerated leaching seepage holes in coastal heavily saline-alkali land includes setting the hole position, drilling the installation hole with an installation drill, installing the seepage pipe and the negative pressure pipe, and evacuating the negative pressure pipe.

[0045] A coastal heavy saline-alkali land speed-increasing leaching seepage hole and installation method. The specific installation steps include:

[0046] The first step is to select the installation hole specifications and set the hole positions; the second step is to drill the installation holes; the third step is to install the device; the fourth step is to evacuate the negative pressure pipe.

[0047] (1) Selection of installation hole specifications and hole position setting: The installation hole specifications are selected according to the required elution depth. The installation hole is a 6-10 cm diameter perforated PVC pipe. The installation hole length is preferably the elution depth minus 6-10 cm. The length of the impermeable water storage section 11 is 10-30% of the total length. The installation hole position setting method is as follows: Figure 1 , evenly arranged in the elution area in a field shape, the seepage pipe 1 and the negative pressure pipe 2 are arranged at intervals, and the appropriate spacing is 4-6 meters.

[0048] (2) Drilling of installation holes: Use an installation drill to drill holes at the selected points. Use a matching installation drill with a diameter equal to the pipe diameter plus 3 cm.

[0049] (3) Installation: The water seepage pipe 1 is wrapped with a water-permeable nonwoven fabric 14 and then placed in the water seepage pipe point hole. The negative pressure pipe 2 is wrapped with a breathable nonwoven fabric 23 and then placed in the negative pressure pipe point hole. Then, the gap between the outer wall of the pipe and the hole is filled.

[0050] (4) Evacuating the negative pressure tube 2: Connect a vacuum pump to the suction hole 21 of the negative pressure tube 2. Multiple tubes can be connected to the same vacuum pump. After connection, check the air tightness. After the air tightness is intact, extract some air from the negative pressure tube 2 to generate negative pressure in the negative pressure tube 2.

[0051] The present invention increases the leaching and permeation area of ​​saline-alkali soil by setting a seepage pipe, and enhances the leaching efficiency of saline-alkali soil by increasing the permeation area. The seepage pipe also has the function of collecting and storing water, reducing surface runoff, and enhancing water utilization efficiency. By setting a negative pressure pipe, the lateral permeation pressure is enhanced, the lateral permeation rate of water is increased, the lateral leaching efficiency of saline-alkali soil is accelerated, and the leaching uniformity of saline-alkali soil is improved. The present invention uses an installation drill for in-situ drilling and installation, and the installation is convenient. The present invention is simple and efficient to implement.

[0052] Example

[0053] A large area of ​​land in Nangang Industrial Zone, Binhai New Area, Tianjin was formed by land reclamation. The industrial zone contains many coastal heavy saline-alkali areas with high soil parent material salt content and poor permeability. A coastal heavy saline-alkali land speed-up leaching infiltration hole and installation method can improve the leaching efficiency of coastal heavy saline-alkali land and increase the water infiltration capacity by increasing the infiltration area and infiltration pressure. A typical heavy saline-alkali area in Nangang Industrial Zone, Binhai New Area, Tianjin was selected for the experiment. The initial salt content of the 0-10, 10-20, 20-30, and 30-40 cm soil layers in the test site were 40.90, 38.49, 36.20, and 32.90 g / kg, respectively. The implementation included the following steps:

[0054] (1) Selection of installation hole specifications and hole position setting: The installation hole is a 6 cm diameter perforated PVC pipe, the elution depth is 30 cm, the installation hole length is 20 cm, and the length of the impermeable water storage section is 5 cm. The installation hole layout spacing is 5 meters.

[0055] (2) Installation hole drilling: The initial point is randomly selected, and the subsequent points are based on the initial point, with a spacing of 5m in the horizontal and vertical distribution. A matching installation drill with a diameter of 9cm is selected.

[0056] (3) Installation: Wrap the seepage pipe with a water-permeable non-woven fabric and place it in the hole of the seepage pipe. Wrap the negative pressure pipe with a breathable non-woven fabric and place it in the hole of the negative pressure pipe. Then fill the gap between the outer wall of the pipe and the hole.

[0057] (4) Vacuuming the negative pressure tube: Connect a vacuum pump to the suction hole of the negative pressure tube. Multiple tubes can be connected to the same vacuum pump. After connection, check the air tightness. After the air tightness is intact, extract some of the air in the negative pressure tube to create negative pressure in the tube.

[0058] (5) Data statistics: Soil sampling and testing were carried out one year after the implementation of the technology. The soil sampling was carried out in layers, with a total of 4 layers (0-10, 10-20, 20-30, 30-40 cm soil depth). The soil sampling positions were 1, 2, 3, and 4 cm away from the seepage pipe. The test plots were randomly sampled three times, and the average value was used as the final result. The statistical results of the test data are shown in Table 1 below.

[0059] Table 1 Statistical results of experimental data of the embodiment

[0060]

[0061] Comparative Example

[0062] The comparative example is set at 10m in the due north direction of Example 1, and no setting of a coastal heavy saline-alkali land speed-increasing leaching seepage hole and installation method is performed. The implementation includes the following steps:

[0063] (1) Data statistics: After one year, soil sampling and testing were carried out in the vacant land where the technology was not applied. The soil sampling was carried out in four layers (0-10, 10-20, 20-30, and 30-40 cm soil depth). The test plots were randomly sampled nine times, and the average value was used as the final result. The statistical results of the test data are shown in Table 1 below.

[0064] Table 2 Statistical results of comparative test data

[0065]

[0066] Example, comparative example effect analysis:

[0067] According to the results of soil salinity, a coastal heavy saline-alkali land speed-up leaching seepage hole and installation method can effectively improve the leaching efficiency of coastal heavy saline-alkali land. According to the results of soil salinity sampling and testing, it can be seen that the leaching efficiency of each soil layer has been improved, the salt leaching effect of shallow soil is greater than that of deep soil, and the closer to the seepage pipe, the more significant the leaching effect.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coastal heavy saline-alkali land speed-up leaching seepage hole, characterized in that: The invention comprises a plurality of water seepage pipes (1) and a plurality of negative pressure pipes (2), wherein the water seepage pipes (1) and the negative pressure pipes (2) are arranged at intervals; the water seepage pipes (1) comprise an integrally formed impermeable water storage section (11) and a water seepage section (12), wherein the water seepage section (12) is arranged below the impermeable water storage section (11).

2. The coastal heavy saline-alkali land speed-increasing leaching and seepage hole according to claim 1, characterized in that: A plurality of water seepage holes (13) are evenly arranged on the surface of the water seepage section (12), and the outside of the water seepage section (12) is also wrapped with a water-permeable non-woven fabric (14).

3. The coastal heavy saline-alkali land speed-increasing leaching and seepage hole according to claim 1, characterized in that: The top of the negative pressure pipe (2) is provided with an air suction hole pipe (21), the surface of the negative pressure pipe (2) is evenly provided with a plurality of air holes (22), the outside of the negative pressure pipe (2) is also wrapped with a breathable non-woven fabric (23), and a check valve (24) is also installed on the air suction hole pipe (21).

4. The coastal heavy saline-alkali land speed-increasing leaching and seepage hole according to claim 1, characterized in that: The spacing between the seepage pipe (1) and the negative pressure pipe (2) is 4-6 meters.

5. A method for installing a speed-increasing leaching and seepage hole in a coastal heavy saline-alkali land, applied to a speed-increasing leaching and seepage hole in a coastal heavy saline-alkali land according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Selecting the installation hole specifications of the seepage pipe (1) and the negative pressure pipe (2) and setting the hole positions; S2, drilling the installation holes; S3, installing the seepage pipe (1) and the negative pressure pipe (2); S4. Evacuate the negative pressure tube (2).

6. The method for installing a speed-increasing leaching hole in coastal heavy saline-alkali land according to claim 5, characterized in that: In step S1, selecting the installation hole specifications of the seepage pipe (1) and the negative pressure pipe (2) and setting the hole positions include: The installation hole specifications are selected according to the required elution depth. The installation hole is a perforated PVC pipe with a diameter of 6-10 cm. The length of the installation hole is the elution depth minus 6-10 cm. The length of the impermeable water storage section (11) is 10-30% of the total length. The installation holes are evenly arranged in the elution area in a field shape, and the seepage pipe (1) and the negative pressure pipe (2) are arranged at intervals, with the arrangement interval being 4-6 meters.

7. The method for installing a speed-increasing leaching hole in coastal heavy saline-alkali land according to claim 5, characterized in that: In step S2, drilling the mounting holes includes: Use an installation drill to drill holes at the selected points, and choose a matching installation drill with a diameter of the pipe plus 3cm.

8. The method for installing the speed-increasing leaching holes in coastal heavy saline-alkali land according to claim 5 is characterized in that: In step S3, the seepage pipe (1) and the negative pressure pipe (2) are installed, including: The outer tube body of the water seepage pipe (1) is wrapped with a water-permeable non-woven fabric (14) and then placed in the point hole of the water seepage pipe (1); the outer tube body of the negative pressure pipe (2) is wrapped with a breathable non-woven fabric (23) and then placed in the point hole of the negative pressure pipe (2); Then fill the gap between the outer wall of the tube and the hole.

9. The method for installing a speed-increasing leaching hole in coastal heavy saline-alkali land according to claim 5, characterized in that: In step S4, the negative pressure tube (2) is evacuated, including: The suction hole (21) of the negative pressure pipe (2) is connected to a vacuum pump, and the air tightness is checked after the connection. After the air tightness is intact, part of the air in the negative pressure pipe (2) is extracted to generate negative pressure in the negative pressure pipe (2).

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