Saline-alkali soil salt reducing and water draining structure

Abstract

A salt reducing and water draining structure for saline-alkali soil relates to the technical field of saline-alkali soil improvement and comprises a foundation trench with an inverted trapezoidal cross section and a concealed pipe body arranged in the foundation trench, and further comprises a soft waterproof plate which is laid in the foundation trench and of which the two sides horizontally extend out of the two sides of an opening in the upper end of the foundation trench, and the concealed pipe body is arranged on the soft waterproof plate. A plurality of supporting strips are arranged on the upper side of the soft waterproof plate side by side and arranged in the length direction of the foundation trench, a plurality of water passing openings penetrating through the two sides of the supporting strips are formed in the lower portions of the supporting strips in the length direction of the supporting strips, the upper sides of the supporting strips are further covered with non-woven fabric fixed to the supporting strips, and the upper side faces of the supporting strips are arc-shaped end faces protruding upwards. The drainage structure is simple in construction, the construction cost is reduced, the efficiency is improved, a plurality of supporting strips on the upper side of the soft waterproof plate provide supporting force while ensuring that an internal water conveying channel is unblocked, and non-woven fabrics on the upper sides of the supporting strips further expand the distance between a foundation trench and soil of a cultivation layer, so that enough space is provided for water seepage, and the drainage effect is improved. And the drainage speed is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of saline-alkali land improvement, in particular to a salt-reducing and drainage structure for saline-alkali land. Background Technique

[0002] The subsurface pipe salt-reducing and drainage technology usually involves excavating a foundation trench at a specific soil layer depth in saline-alkali land and burying subsurface pipes therein. These subsurface pipes function to lower the groundwater level by draining water, thereby reducing the upward movement of salts in the soil and achieving the effect of salt reduction and drainage in the planting layer.

[0003] In a traditional subsurface pipe drainage system for saline-alkali land, such as a subsurface pipe salt-excluding, salt-isolating and salt-controlling foundation structure for saline-alkali land improvement with the application number CN202121612245.1, subsurface pipes are buried in the foundation trench and gravel is filled into the foundation trench as a support structure and a water conveyance medium. Although this structure can drain water in a timely manner, the transportation and filling process of gravel need to be completed by relying on agricultural mechanization tools, with a relatively large one-time investment, high construction requirements, and it will be very troublesome to adjust the subsurface pipes once the gravel is filled. Therefore, the method based on filling gravel is not only cumbersome and inefficient in construction, but also not very practical in actual application. Content of the Utility Model

[0004] To solve the technical problems existing in the above background technique, the utility model provides a salt-reducing and drainage structure for saline-alkali land.

[0005] The technical solution of the utility model is as follows:

[0006] A salt-reducing and drainage structure for saline-alkali land includes a foundation trench with an inverted trapezoidal cross-sectional shape opened in the saline-alkali land and a subsurface pipe body arranged inside it. When in use, the water flow such as the cultivated layer on the upper side of the foundation trench and the irrigation water and rainwater during the rainy season on both sides of the foundation trench flows into the foundation trench along the two side walls of the foundation trench, then converges inside the subsurface pipe body, and is discharged through the subsurface pipe body, realizing the salt reduction and alkali reduction of the saline-alkali land, effectively reducing the groundwater level of the saline-alkali land, reducing the salts brought into the tillage layer due to the evaporation of rising groundwater, and preventing salt return and alkali return.

[0007] As the core technical concept of the present utility model, the drainage structure also lays a drainage board in the base trench, and the drainage board includes a soft waterproof board laid in the base trench and horizontally extending out of the upper opening of the base trench on both sides, the concealed pipe body is arranged on the soft waterproof board, and a plurality of support bars are arranged in parallel on the upper side of the soft waterproof board, the support bars are arranged along the length direction of the base trench, and a plurality of water outlets penetrating the two sides of the support bars are opened along the length direction of the support bars at the lower part, and a non-woven fabric fixed to the support bars is also covered on the upper side of the plurality of support bars, so that the non-woven fabric will not be easily displaced. The drainage structure is supported by laying the drainage board in the base trench as a support After the excavation of the foundation trench is completed, the construction workers can quickly complete the laying of the supporting structure and the water transfer medium. The several branches on the upper side of the soft waterproof board not only ensure the smooth flow of the internal water transfer channel, but also provide good supporting force. Through the support of the branches, the non-woven fabric on the upper side of the branches also increases the distance between the foundation trench and the cultivated layer of soil, providing sufficient space for water infiltration and speeding up the drainage. Compared with the traditional method of filling gravel into the foundation trench, the investment cost of drainage construction is greatly reduced. The method of laying drainage boards is simple to construct, improves construction efficiency, and is highly practical.

[0008] As a further implementation:

[0009] The upper side of the support bar is an upwardly convex arc-shaped end face. When the soil is pressed on the non-woven fabric, the entire arc-shaped end face will form an effective support for the non-woven fabric. The structure of the arc-shaped end face on the upper side of the support bar can increase the contact area with the non-woven fabric, which helps to distribute the load on the non-woven fabric more evenly and reduce damage or deformation of the non-woven fabric caused by excessive local force; at the same time, the design of the arc-shaped end face also helps the flow of water on the support bar, which can reduce water flow resistance, especially after the rainy season, it helps to drain the accumulated water faster and lower the groundwater level; in addition, the water filtered by the non-woven fabric sometimes still contains a small amount of fine sediment, and the design of the arc-shaped end face just helps to reduce the deposition of sediment on the surface of the support bar, because the arc-shaped surface is not conducive to the retention and accumulation of sediment, which keeps the water outlet unobstructed and ensures the long-term effectiveness of the drainage system.

[0010] In order to improve the strength of the connection between the non-woven fabric and the support bar, a plurality of fixing bars connected to the support bar are provided on the upper side of the non-woven fabric. The connection method can be connecting screws, and the cross-sectional width of the fixing bar does not exceed 1 / 4 of the cross-sectional width of the arc-shaped end surface on the upper side of the support bar.

[0011] To improve drainage efficiency:

[0012] At least two support bars are provided in the base trench, which are respectively located on both sides of the base trench, and the concealed pipe body is arranged between the two support bars. A certain water flow space is formed between the two support bars and the non-woven fabric. This space helps the water flow to converge from both sides of the base trench to the concealed pipe body, so as to speed up the drainage efficiency of the concealed pipe body.

[0013] Based on the above design, the upper horizontal planes of the two branches are higher than the upper horizontal plane of the concealed pipe body to ensure that the non-woven fabric will not sink or shift directly or due to soil pressure or water flow impact, covering the upper area of ​​the concealed pipe body and avoiding obstruction of water flow on the upper side of the concealed pipe body from entering the concealed pipe body, which helps to maintain the integrity and durability of the drainage structure.

[0014] To further improve drainage efficiency:

[0015] The lower inner side of the concealed pipe body is a V-shaped guide groove structure, so that the water flow inside the concealed pipe body can be gathered in the V-shaped guide groove structure and discharged quickly, which is not only conducive to the gathering of water flow, but also can increase the speed of water flow. Even small particles of mud and sand mixed in the water flow can be discharged from the concealed pipe body under the push of the water flow, thereby improving the efficiency and effect of salt reduction and drainage.

[0016] A waterproof geotextile is also provided on the lower side of the soft waterproof board to strengthen the water-isolating effect of the lower side of the soft waterproof board, effectively prevent water from flowing away from the lower side of the soft waterproof board, and improve the efficiency and effect of salt reduction and drainage.

[0017] A mesh is vertically arranged on the outer edge of the soft waterproof board, and the outer edge of the non-woven fabric is overlapped on the outer side of the mesh, thereby enhancing the stability of the non-woven fabric covering the upper side of several support strips, and the water flow around the drainage board can also penetrate into the drainage channel of the drainage pipe through the mesh.

[0018] In order to facilitate the laying of the soft waterproof board, a fixing claw is also provided on the lower side of the soft waterproof board, so that the contact between the soft waterproof board and the base trench is closer, which simplifies the installation process and adapts to different soil conditions. Construction workers can quickly and easily fix the soft waterproof board to the base trench, improving construction flexibility.

[0019] After the excavation of the foundation trench of this drainage structure is completed, the construction workers can quickly complete the laying of the supporting structure and the water transfer medium, and the several branches on the upper side of the soft waterproof board not only ensure the smooth flow of the internal water transfer channel, but also provide good supporting force. Through the support of the branches, the non-woven fabric on the upper side of the branches also increases the distance between the foundation trench and the cultivated layer of soil, providing sufficient space for water infiltration, speeding up the drainage speed, and compared with the traditional method of filling gravel into the foundation trench, the investment cost of drainage construction is greatly reduced, and the method of laying drainage boards is simple to construct and improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the attached picture:

[0021] Figure 1 This is a structural schematic diagram (transverse cross section) of a saline-alkali land desalination and drainage structure of the utility model;

[0022] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0023] Figure 3 For Figure 1 The enlarged schematic view of part B in

[0024] Figure 4 The structural schematic view of the concealed pipe body in the present utility model

[0025] Figure 5 The structural schematic view (in the length direction of the support strip) of the support strip in the present utility model

[0026] Figure 6 For Figure 5 The schematic cross-sectional view of CC in

[0027] The components represented by each reference numeral in the figure are as follows

[0028] 1, base groove; 2, concealed pipe body; 21, diversion groove; 3, drainage board; 31, soft waterproof board; 32, support strip; 33, mesh board; 4, fixing claw; 5, non-woven fabric Specific embodiments

[0029] Combined with Figure 1 , this embodiment provides a saline-alkali land desalination and drainage structure. This drainage structure realizes the purpose of desalination and alkali reduction by digging an inverted trapezoidal base groove 1 in the saline-alkali land and arranging a concealed pipe body 2 therein. When in use, the water flow such as the cultivated layer on the upper side of the base groove 1 and the irrigation water and rainwater on both sides of the base groove 1 flows into the base groove 1 along the two side walls of the base groove 1, then converges inside the concealed pipe body 2, and is discharged through the concealed pipe body 2, realizing the desalination and alkali reduction of the saline-alkali land. It can also effectively reduce the groundwater level of the saline-alkali land, reduce the salt brought into the tillage layer due to the evaporation of rising groundwater, and prevent salt return and alkali return

[0030] As the core technical concept of the present utility model, the drainage structure also lays a drainage board 3 in the base trench 1. The drainage board 3 includes a soft waterproof board 31 laid in the base trench 1 and extending horizontally on both sides of the upper opening of the base trench 1. The concealed pipe body 2 is arranged on the soft waterproof board 31, and a plurality of support bars 32 are arranged in parallel on the upper side of the soft waterproof board 31. The support bars 32 are arranged along the length direction of the base trench 1, and the lower part of the support bars 32 is provided with a plurality of water outlets passing through the two sides thereof along the length direction. The upper side of the plurality of support bars 32 is also covered with a non-woven fabric 5 fixed thereto, so that the non-woven fabric 5 will not be easily displaced. The drainage structure lays a drainage board in the base trench 1. 3 is used as a supporting structure and a water delivery medium. After the excavation of the foundation trench 1 is completed, the construction workers can quickly complete the laying of the supporting structure and the water delivery medium. The plurality of support bars 32 on the upper side of the soft waterproof board 31 not only ensure the smooth flow of the internal water delivery channel, but also provide a good supporting force. Through the support of the support bars 32, the non-woven fabric 5 on the upper side of the support bars 32 also increases the distance between the foundation trench 1 and the cultivated layer of soil, providing sufficient space for water seepage, accelerating the drainage speed, and compared with the traditional method of filling gravel into the foundation trench 1, the investment cost of drainage construction is greatly reduced. The method of laying the drainage board 3 is simple to construct, improves the construction efficiency, and is very practical.

[0031] For the structure of the support bar 32, combined with Figure 5 and Figure 6 Specifically:

[0032] The upper side of the support bar 32 is an arc-shaped end face that bulges upward. After the soil is pressed on the non-woven fabric 5, the entire arc-shaped end face will form an effective support for the non-woven fabric 5. The structure of the arc-shaped end face on the upper side of the support bar 32 can increase the contact area with the non-woven fabric 5, which helps to distribute the load on the non-woven fabric 5 more evenly and reduce damage or deformation of the non-woven fabric 5 caused by excessive local force; at the same time, the design of the arc-shaped end face also helps the flow of water on the support bar 32, which can reduce water flow resistance, especially after the rainy season, which helps to drain the accumulated water faster and lower the groundwater level; in addition, the water filtered by the non-woven fabric 5 sometimes still contains a small amount of fine sediment, and the design of the arc-shaped end face just helps to reduce the deposition of sediment on the surface of the support bar 32, because the arc-shaped surface is not conducive to the retention and accumulation of sediment, which keeps the water outlet unobstructed and ensures the long-term effectiveness of the drainage system.

[0033] As an implementation method, a plurality of fixing strips connected to the support strips 32 are provided on the upper side of the non-woven fabric 5, and the fixing strips are rectangular strips arranged along the length direction of the support strips 32, and the cross-sectional thickness does not exceed 2 mm. The fixing strips and the support strips 32 can be connected by connecting screws, and the cross-sectional width of the fixing strips does not exceed 1 / 4 of the cross-sectional width of the arc-shaped end surface on the upper side of the support strip 32.

[0034] Combination Figure 3, there are two support bars 32 provided in the foundation trench 1, and at least two support bars 32 should be provided. The two support bars 32 are respectively arranged on both sides inside the foundation trench 1, and the buried pipe body 2 is arranged between the two support bars 32. A certain water flow space is formed between the two support bars 32 and the non-woven fabric 5. This space helps the water flow to converge from both sides of the foundation trench 1 to the buried pipe body 2, so as to accelerate the drainage efficiency of the buried pipe body 2.

[0035] Based on the above design, the upper horizontal plane heights of the two support bars 32 located in the foundation trench 1 are both higher than the upper horizontal plane height of the buried pipe body 2, so as to ensure that the non-woven fabric 5 will not sink or shift directly or due to soil pressure or water flow impact, covering the upper area of the buried pipe body 2, and avoiding hindering the water flow on the upper side of the buried pipe body 2 from entering the buried pipe body 2, which helps to maintain the integrity and durability of the drainage structure.

[0036] Combined with Figure 3 , the soft waterproof board 31 is laid on the foundation trench 1 to form a total of 4 corners, and support bars 32 are respectively provided on the soft waterproof board 31 on both sides of each corner point, and the two support bars 32 located at the same corner point are arranged close to the corner point to support the non-woven fabric 5 located at the corner point, ensuring that there is also enough water passing space between the non-woven fabric 5 located at the corner point and the soft waterproof board 31 for the water flow to pass through.

[0037] As an implementation method, a waterproof geotextile is also provided on the lower side of the soft waterproof board 31 to enhance the water isolation effect on the lower side of the soft waterproof board 31, effectively preventing the water flow from flowing away from the lower side of the soft waterproof board 31, and improving the efficiency and effect of desalination and drainage.

[0038] Combined with Figure 2 , a mesh plate 33 is vertically provided on the outer edge of the soft waterproof board 31, and the outer edge of the non-woven fabric 5 is lapped outside the mesh plate 33 to enhance the stability of the non-woven fabric 5 covering the upper side of several support bars 32, and the water flow around the drainage board 3 can also seep into the drainage channel of the drainage pipe through the mesh plate 33.

[0039] Combined with Figure 1 , several fixing claws 4 are also provided on the lower side of the soft waterproof board 31, and at least the fixing claws 4 are provided at the outer edge position of the soft waterproof board 31 and at each corner position formed by the soft waterproof board 31 laid on the foundation trench 1, so that the contact between the soft waterproof board 31 and the foundation trench 1 is closer, simplifying the installation process, adapting to different soil conditions, and enabling construction workers to quickly and easily fix the soft waterproof board 31 on the foundation trench 1, improving the construction flexibility.

[0040] It should be noted that the main structure of the buried pipe body 2 in this embodiment adopts the existing technology, so the detailed structures thereon, such as the water seepage holes, are not shown in the figure.

[0041] Combined with Figure 4, the lower end of the buried pipe body 2 is set as a flat surface to facilitate its stable installation on the soft waterproof board 31, and the lower side inside the buried pipe body 2 is of a V-shaped diversion groove 21 structure, so that the water flow inside the buried pipe body 2 can converge and be quickly discharged within the V-shaped diversion groove 21 structure, which not only facilitates the convergence of the water flow, but also can increase the water flow speed. Even the small particle sediment mixed in the water flow can be discharged from the buried pipe body 2 under the pushing action of the water flow, thereby improving the efficiency and effect of desalination and drainage.

Claims

1. A saline-alkali land desalination and drainage structure, comprising a base trench (1) with an inverted trapezoidal cross-section and a concealed pipe body (2) arranged inside the base trench, characterized in that: It also includes a soft waterproof board (31) which is laid in the base trench (1) and whose two sides extend horizontally out of the two sides of the upper opening of the base trench (1); the concealed pipe body (2) is arranged on the soft waterproof board (31); and a plurality of support bars (32) are arranged in parallel on the upper side of the soft waterproof board (31); the support bars (32) are arranged along the length direction of the base trench (1); and a plurality of water outlets (322) which pass through the two sides of the support bars (32) are opened at the lower part of the support bars (32) along the length direction thereof; The upper sides of the plurality of support strips (32) are also covered with non-woven fabrics (5) fixed thereto.

2. A saline-alkali land desalination and drainage structure as claimed in claim 1, characterized in that: The upper side surface of the support bar (32) is an upwardly convex arc-shaped end surface (321).

3. A saline-alkali land desalination and drainage structure as claimed in claim 2, characterized in that: The upper side of the non-woven fabric (5) is provided with a plurality of fixing strips connected to the support strips (32).

4. The saline-alkali land desalination and drainage structure according to claim 1, characterized in that: The lower inner side of the concealed pipe body (2) is a V-shaped guide groove (21) structure.

5. A saline-alkali land desalination and drainage structure according to any one of claims 1 to 4, characterized in that: At least two support bars (32) are arranged in the base groove (1), which are respectively located on two sides of the base groove (1), and the concealed pipe body (2) is arranged between the two support bars (32).

6. A saline-alkali land desalination and drainage structure as claimed in claim 5, characterized in that: The upper horizontal plane heights of the two support bars (32) are both higher than the upper horizontal plane height of the concealed pipe body (2).

7. A saline-alkali land desalination and drainage structure as claimed in claim 5, characterized in that: A mesh plate (33) is vertically arranged on the outer edge of the soft waterproof plate (31), and the outer edge of the non-woven fabric (5) is overlapped on the outer side of the mesh plate (33).

8. The saline-alkali land desalination and drainage structure according to claim 5, characterized in that: The lower side of the soft waterproof plate (31) is also provided with a fixing claw (4).

9. The saline-alkali land desalination and drainage structure according to claim 5, characterized in that: A waterproof geotextile is also provided on the lower side of the soft waterproof board (31).

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