CN119373224A - Drainage system and installation method for saline-alkali land - Google Patents

Abstract

The present application relates to a drainage system and installation method for saline-alkali land, wherein the drainage system for saline-alkali land comprises an inspection well, which is arranged vertically and at least partially buried underground, wherein a cavity with an open top is provided in the inspection well, and a perforation is provided on the side wall of the inspection well; a concealed pipe, which is arranged horizontally underground, wherein the first end of the concealed pipe is penetrated in the perforation, wherein the first end of the concealed pipe has a water outlet connected to the cavity, the second end of the concealed pipe is closed, and a water inlet is provided on the surface of the concealed pipe; a drainage mechanism, which comprises a drainage pump and a drainage pipe for discharging water in the cavity, wherein the drainage pump and at least part of the drainage pipe are arranged in the cavity, and the drainage pump is connected to the drainage pipe; and a floating body, which is arranged in the cavity, is connected to the drainage pump, and is configured to float upward to control the drainage pump to work when the liquid level rises to the water outlet. To avoid the sewage in the inspection well from flowing back into the concealed pipe, the entire drainage system does not need to set up an additional water collecting pipe, and adopts a concealed pipe direct discharge method, thereby reducing the risk of clogging of the concealed pipe.

Description

Drainage system for saline-alkali soil and installation method

Technical Field

The application relates to the technical field of saline-alkali soil drainage, in particular to a drainage system and an installation method of saline-alkali soil.

Background

At present, saline-alkali soil treatment and control of groundwater level a combination system of a concealed pipe and a water collecting pipe is adopted. The underground pipe is buried below the critical depth in the farmland, when the underground water level rises to the underground pipe, water is discharged into the water collecting pipe, and the water in the water collecting pipe is concentrated into the water collecting well or the open trench and is uniformly discharged.

However, due to the fact that the concealed pipes are buried deeply and the filter layer is protected, the sludge is easy to enter the concealed pipes, and finally enters the water collecting pipes and the water collecting wells, once the water collecting pipes and the water collecting wells are blocked, the water draining and salt discharging functions of all the concealed pipes are invalid after the blocking point, and the water collecting wells are filled with the sludge over time. When the blockage occurs, the blockage is mainly manually dredged, time and labor are wasted, and the blockage can be temporarily relieved only.

Disclosure of Invention

Based on this, it is necessary to provide a drainage system for saline-alkali soil which does not require a water collecting pipe and avoids the risk of clogging of the concealed pipe.

The application provides a drainage system of saline-alkali soil, which comprises an inspection well, a concealed pipe, a drainage mechanism and a floating body, wherein the inspection well is vertically arranged and at least partially buried in the ground, a containing cavity with an open top is arranged in the inspection well, a through hole is formed in the side wall of the inspection well, the concealed pipe is transversely arranged in the ground, a first end of the concealed pipe penetrates through the through hole, a water outlet communicated with the containing cavity is formed in the first end of the concealed pipe, a second end of the concealed pipe is closed, a water inlet hole is formed in the surface of the concealed pipe, the drainage mechanism comprises a drainage pump and a drainage pipe used for draining water in the containing cavity, the drainage pump and at least a part of the drainage pipe are arranged in the containing cavity and are communicated with the drainage pipe, and the floating body is arranged in the containing cavity and connected with the drainage pump and is configured to float upwards to control the drainage pump to work when the liquid level rises to the water outlet.

In one embodiment, a filter screen for sludge to pass through is arranged in the accommodating cavity and below the water outlet, the filter screen separates the accommodating cavity into an accommodating cavity and a filter cavity which are sequentially communicated from top to bottom, and the drainage pump is positioned in the accommodating cavity and is placed on the filter screen.

In one embodiment, a supporting leg for supporting the filter screen is disposed at the bottom of the filter screen, the supporting leg extends downward, and at least a portion of the bottom surface of the supporting leg contacts the bottom of the cavity when the filter screen is disposed in the cavity.

In one embodiment, the height of the supporting legs is H, the height H is 50cm > H is more than or equal to 10cm, filtering holes are distributed on the filter screen, and the aperture of the filtering holes is larger than 1cm.

In one embodiment, the float is located below the water outlet in a position in which the liquid level rises to the water outlet.

In one embodiment, the upper end of the inspection well extends out of the ground and is positioned above the ground, the distance between the top of the concealed pipe and the ground is h1, the distance between the bottom of the concealed pipe and the inner bottom end of the inspection well is h2, and the distances h1 and h2 meet the conditions that h1 is more than or equal to 1m, and 0.8m is more than or equal to 0.5m.

In one embodiment, the concealed pipe and the inspection well are sequentially arranged along a first direction, the concealed pipe gradually inclines downwards along the first direction, and the longitudinal slope of the concealed pipe is reduced to 0.8-1.2 per mill.

In one embodiment, at least three water inlets are arranged at intervals along the circumferential direction of the concealed pipe, the concealed pipe is a corrugated pipe with wave crests and wave troughs, the water inlets are positioned at the wave troughs, a water-permeable and corrosion-resistant protective layer is covered on the peripheral wall of the concealed pipe, and a coarse sand layer is covered on the periphery of the protective layer.

In one embodiment, the side wall of the inspection well is provided with a hole for the drain pipe to pass through at a position above the ground, the ground is recessed downwards to form a drainage ditch, the hole is positioned at the side of the drainage ditch, the part of the drain pipe passing through the hole is a water outlet section, and the water outlet section is communicated with the drainage ditch.

The application also discloses an installation method of the drainage system, wherein the drainage system is the drainage system according to any embodiment, and the installation method sequentially comprises the following steps:

step 1), exploring the topography of the saline-alkali soil, determining the depth and direction of laying the concealed pipe, covering a permeable and corrosion-resistant protective layer on the peripheral wall of the concealed pipe, and covering a coarse sand layer on the periphery of the protective layer;

step 2), the inspection well is vertically buried underground, and the first end of the concealed pipe is arranged in a through hole in the side wall of the inspection well in a penetrating mode;

step 3), placing a filter screen which is transversely arranged at the bottom of the accommodating cavity, wherein a space is reserved between the bottom wall of the filter screen and the bottom wall of the accommodating cavity;

And 4) placing a drainage pump on the top surface of the filter screen, wherein when the water level in the cavity of the inspection well reaches the height of the water outlet of the concealed pipe, the floating body can control the drainage pump to work, and the drainage pipe discharges the water in the cavity outwards.

Compared with the prior art, in the drainage system provided by the application, the drainage pump and the floating body are arranged in the inspection well, the floating body can float upwards under the action of water, when the water level discharged into the inspection well through the water outlet of the concealed pipe reaches the water outlet of the concealed pipe, the floating body moves upwards to start the drainage pump to work, the water in the inspection well is discharged through the drainage pipe, the sewage in the inspection well is prevented from flowing back into the concealed pipe, the whole drainage system does not need to be additionally provided with the water collecting pipe, the blocking risk of the concealed pipe is reduced by adopting a manner of directly discharging the concealed pipe, the salt drainage effect is good, and the maintenance is simple.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a block diagram of a drainage system according to an embodiment of the present application;

fig. 2 is a schematic view of a part of the construction of the concealed pipe in fig. 1.

The water-saving type water-saving device comprises the following components of 1, an inspection well, 11, a containing cavity, 111, a containing cavity, 112, a filtering cavity, 12, a well cover, 2, a concealed pipe, 20, a water outlet, 200, a wave crest, 201, a wave trough, 202, a water inlet, 21, a protective layer, 22, a coarse sand layer, 3, a water draining mechanism, 31, a drainage pump, 32, a drainage pipe, 321, a water outlet section, 4, a floating body, 5, a filter screen, 51, supporting legs, 6, a drainage ditch, 61, a first position, 7 and the ground.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description of the present application for the purpose of describing various example structural parts and elements thereof, but are used herein for convenience of description and are not to be construed as exclusive embodiments based on the example orientations shown in the drawings. Because the embodiments disclosed herein may be arranged in a different orientation, the terms indicating orientation are by way of illustration only and should not be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to orientations that are opposite or coincident with the direction of gravity.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

It should be noted that "axially disposed" means that the overall arrangement direction extends along the axial direction, including but not limited to, and may form an angle with the axial direction.

Unless defined otherwise, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in the description of the present application includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, the present application discloses a drainage system for saline-alkali soil. The drainage system comprises an inspection well 1, a concealed pipe 2, a drainage mechanism 3 and a floating body 4. Wherein the inspection well 1 is vertically arranged and at least partially buried in the ground, and a cavity 11 with an open top is arranged in the inspection well 1, that is, the inspection well 1 is open at the top. The side wall of the manhole 1 is provided with perforations.

As shown in fig. 1 and 2, the concealed pipe 2 is transversely arranged underground, a first end of the concealed pipe 2 is penetrated in the perforation, the first end of the concealed pipe 2 is provided with a water outlet 20 communicated with the containing cavity 11, a second end of the concealed pipe 2 is closed, and the surface of the concealed pipe 2 is provided with a water inlet 202. In one embodiment, there are two water inlet holes 202. In the present embodiment, at least three water inlets 202 are provided and are arranged at intervals along the circumferential direction of the blind pipe 2.

In the present embodiment, the second end of the blind pipe 2 is bound with a nonwoven fabric and is closed, thereby closing the second end. In addition, the sealing can be realized in other ways.

The drain mechanism 3 includes a drain pump 31 and a drain pipe 32 for draining water in the chamber 11, the drain pump 31 and at least part of the drain pipe 32 are disposed in the chamber 11, and the drain pump 31 is in communication with the drain pipe 32. In the present embodiment, a portion of the drain pipe 32 is located in the chamber 11.

The floating body 4 is disposed in the cavity 11, and the floating body 4 is connected with the drain pump 31 and configured to float upwards to control the drain pump 31 to operate when the liquid level rises to the water outlet 20. That is, the float 4 serves as a means for controlling the start and stop of the drain pump 31. The working principle of the floating body 4 driving the drain pump 31 to start and stop is the same as that in the prior art, and detailed description thereof will be omitted in this embodiment.

It can be understood that through setting up drain pump 31 and body 4 in inspection shaft 1, body 4 can upwards float under the effect of water, when the water level that the delivery port 20 of 2 was discharged into inspection shaft 1 reaches the delivery port 20 department of 2 of hidden pipe, body 4 upward movement to start drain pump 31, drain pump 31 work, drain the water in the inspection shaft 1 through drain pipe 32, avoid the sewage backward flow in the inspection shaft 1 to the hidden pipe 2 in, whole drainage system need not to set up the collector pipe in addition, adopt the mode of hidden pipe 2 inline, the jam risk of hidden pipe 2 has been reduced, it is effectual to arrange salt drainage, and maintain simply.

In the present embodiment, the float 4 is located below the water outlet 20 in a state where the liquid level rises to the position at the water outlet 20. Thus, the reliability of the operation of the floating body 4 can be ensured, and the situation that the floating body 4 does not drive the drainage pump 31 to operate is avoided when the water level reaches the water outlet 20.

The manhole cover 12 is covered on the top opening of the manhole 1, and the opening can be opened or closed. The opening is opened to facilitate maintenance or replacement of the drain pump 31. The opening is closed, so that the user is prevented from falling into the well carelessly, and the safety is improved.

A filter screen 5 for sludge to pass through is arranged in the containing cavity 11 at a position below the water outlet 20, the filter screen 5 separates the containing cavity 11 to form a containing cavity 111 and a filter cavity 112 which are sequentially communicated from top to bottom, and a drainage pump 31 is arranged in the containing cavity 111 and is placed on the filter screen 5.

It can be understood that the filter screen 5 is present, the sludge entering the cavity 11 through the water outlet 20 in the concealed pipe 2 is deposited into the filter cavity 112 after passing through the filter screen 5, and the drain pump 31 is placed on the filter screen 5, so that the drain pump 31 is prevented from contacting the sludge, the risk of blocking the drain pump 31 is reduced, and the service life of the drain pump 31 is prolonged.

In addition, when the sludge in the filter cavity 112 of the inspection well 1 reaches the surface of the filter screen 5, the water in the inspection well 1 is pumped out, and the filter screen 5 is lifted by a lifting rope for manual dredging. After dredging is completed, the filter screen 5 is put back to the bottom of the well.

In order to better support the drain pump 31, the filter screen 5 is a stainless steel screen, so that the strength of the filter screen 5 is ensured.

The bottom of the filter screen 5 is provided with a supporting leg 51 for supporting the filter screen 5, the supporting leg 51 extends downwards, and at least part of the bottom surface of the supporting leg 51 is in contact with the bottom of the accommodating cavity 11 in the state that the filter screen 5 is arranged in the accommodating cavity 11. It will be appreciated that the presence of the support feet 51 better supports the filter screen 5. In another embodiment, a support portion for supporting the filter screen 5 may be provided on the inner peripheral wall of the manhole 1. In the present embodiment, there are at least two support legs 51.

The height of the supporting legs 51 is H, the height H is 50cm > H is more than or equal to 10cm, the filter screen 5 is provided with filter holes, and the aperture of the filter holes is more than 1cm. It will be appreciated that the height of the support feet 51 is within the above range, and the drain pump 31 is better protected while the number of times of cleaning the sludge is ensured.

The upper end of the inspection well 1 extends out of the ground 7 and is positioned above the ground, the distance between the top of the concealed pipe 2 and the ground 7 is h1, the distance between the bottom of the concealed pipe 2 and the inner bottom of the inspection well 1 is h2, and the distances h1 and h2 meet the conditions that h1 is more than or equal to 1m, and 0.8m is more than or equal to 0.5m. The upper limit value of the depth h1 of the buried pipe is influenced by the actual groundwater level depth, and the depth of the buried pipe is selected according to the actual situation, so long as good water and salt draining effects can be obtained. The arrangement of the distance h2 can ensure that the inspection well is at a reasonable depth while ensuring that the floating body floats reliably, and effectively solves the problem of cost increase caused by overlarge burial depth.

Above-mentioned ground 7 undercut is formed with escape canal 6, and the trompil that supply and drainage pipe 32 worn out has been seted up to the lateral wall of inspection shaft 1 in the position that is located ground 7 top, and the trompil is located the side of escape canal 6, and the part after drain pipe 32 worn out the trompil is water outlet section 321, and water outlet section 321 is linked together with escape canal 6. It follows that the first end of the wand 2 is arranged close to the drain 6 and the second end of the wand 2 is arranged remote from the drain 6.

In addition, the drainage ditch 6 may be an original drainage ditch 6 of the saline-alkali soil, and the inspection well 1 and the concealed pipe 2 are disposed at positions close to the drainage ditch 6.

In one embodiment, the end of the water outlet 321 rests on the periphery of the drain 6. In this embodiment, the distance between the position of the opening and the ground 7 is smaller than 5cm, and after the drain pipe 32 is installed, a cement blocking measure should be performed on the opening to prevent soil from entering the manhole 1. The orthographic projection of the water outlet section 321 is located in the drainage ditch 6, the contact position between the edge of the opening at the top of the drainage ditch 6 and the drainage pipe 32 is the first position 61, the distance between the first position 61 and the water outlet section 321 is 10cm, i.e. the length of the water outlet section 321 exceeding the edge of the drainage ditch 6 is 10cm. It will be appreciated that the water outlet 321 extends beyond the edge of the drain 6, so that water flowing out of the water outlet 321 can more reliably flow into the drain, and the discharged water is prevented from flowing to the ground.

The distance h3 between the top end of the inspection well 1 and the ground is h3, and the distance h3 is more than or equal to 30cm and less than or equal to 40cm. It can be understood that the top end of the inspection well is higher than the ground, on one hand, water on the ground is prevented from penetrating into the cavity of the inspection well when the inspection well rains, and on the other hand, the position of the inspection well is convenient to observe.

The concealed pipe 2 and the inspection well 1 are sequentially arranged along the first direction x, the concealed pipe 2 gradually inclines downwards along the first direction x, and the longitudinal slope of the concealed pipe 2 is reduced to 0.8-1.2 per mill. In the range of the longitudinal slope drop, the aim of saving cost can be achieved under the condition that the water flow in the concealed pipe reliably flows into the inspection well.

As shown in fig. 2, at least three water inlets 202 are arranged at intervals along the circumference of the concealed pipe 2. The concealed pipe 2 is a corrugated pipe with wave crests 200 and wave troughs 201, the water inlet holes 202 are positioned at the wave troughs, a water-permeable and corrosion-resistant protective layer 21 is covered on the peripheral wall of the concealed pipe 2, and a coarse sand layer 22 is covered on the periphery of the protective layer 21. It will be appreciated that the water inlet 202 is arranged at the trough 201, leaving a gap between the water inlet 202 and the outer protective layer 21, reducing the risk of the water inlet 202 being blocked. In the present embodiment, the protective layer 21 is a nonwoven fabric.

The water inlet 202 may be oval or elongated. In addition, the application also discloses an installation method of the drainage system, which comprises the following steps in sequence:

Step 1), surveying the topography of the saline-alkali soil, determining the laying depth and direction of the concealed pipe 2 according to actual conditions, covering a permeable and corrosion-resistant protective layer 21 on the peripheral wall of the concealed pipe 2, covering a coarse sand layer 22 on the periphery of the protective layer 21, wherein the thickness of the coarse sand layer 22 is not less than 10cm, the outer diameter of the concealed pipe 2 is not less than 110mm, the longitudinal gradient of the concealed pipe 2 is between 0.8-1.2 per mill, bundling the second end of the concealed pipe 2 through non-woven fabrics and blocking the second end of the concealed pipe 2;

step 2), vertically burying the inspection well 1 in the ground, and penetrating the first end of the hidden pipe 2 into a through hole on the side wall of the inspection well 1, wherein the inner diameter of the inspection well 1 is not less than 0.8m, the distance h2 between the bottom of the hidden pipe 2 and the bottom of the well is not less than 0.5m, the height (h 3) of the inspection well 1 beyond the ground is not less than 30cm, and the top of the inspection well 1 is covered with the well cover 12;

Step 3), a filter screen 5 which is transversely arranged is placed at the bottom of the containing cavity 11, and supporting feet 51 at the bottom of the filter screen 5 are supported at the bottom of the well, so that a space is reserved between the bottom wall of the filter screen 5 and the bottom wall of the containing cavity 11;

Step 4), placing the drain pump 31 on the top surface of the filter screen 5, when the water level in the cavity 11 of the inspection well 1 reaches the height of the water outlet 20 of the concealed pipe 2, the floating body 4 controls the drain pump 31 to work, and the drain pipe 32 discharges the water in the cavity 11 outwards.

In this embodiment, the drain pump 31 is a submersible pump, and the amount of water to be discharged should not be less than 1.5m ³/h. The drain pipe 32 is a hard pipe made of PE.

The installation method of the drainage system is simple, only the concealed pipe 2 and the inspection well 1 are buried underground, the water collecting pipe is not required to be installed, namely, an open ditch required by the water collecting pipe is not required to be additionally excavated, the construction cost is reduced, and the occupation of the farmland area due to construction is reduced. In addition, can rely on the original escape canal 6 of saline and alkaline land to accomplish the drainage, whole drainage system simple structure and drainage are convenient.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be determined from the following claims.

Claims (10)

1. A drainage system for saline-alkali soil, comprising:

The inspection well (1) is vertically arranged and at least partially buried underground, a containing cavity (11) with an open top is arranged in the inspection well (1), and a through hole is formed in the side wall of the inspection well (1);

the first end of the hidden pipe (2) is penetrated in the perforation, the first end of the hidden pipe (2) is provided with a water outlet (20) communicated with the containing cavity (11), the second end of the hidden pipe (2) is closed, and the surface of the hidden pipe (2) is provided with a water inlet (202);

a drainage mechanism (3) comprising a drainage pump (31) and a drainage pipe (32) for draining water in the cavity (11), wherein the drainage pump (31) and at least part of the drainage pipe (32) are arranged in the cavity (11), and the drainage pump (31) is communicated with the drainage pipe (32);

The floating body (4) is arranged in the accommodating cavity (11), the floating body (4) is connected with the drainage pump (31) and is configured to float upwards to control the drainage pump (31) to work when the liquid level rises to the water outlet (20).

2. The drainage system according to claim 1, wherein a filter screen (5) for sludge to pass through is arranged in the containing cavity (11) at a position below the water outlet (20), the filter screen (5) separates the containing cavity (11) to form a containing cavity (111) and a filter cavity (112) which are sequentially communicated from top to bottom, and the drainage pump (31) is arranged in the containing cavity (111) and is placed on the filter screen (5).

3. Drainage system according to claim 2, characterized in that the bottom of the screen (5) is provided with a support foot (51) for supporting the screen (5), the support foot (51) extending downwards, at least part of the bottom surface of the support foot (51) being in contact with the bottom of the cavity (11) in the condition that the screen (5) is arranged in the cavity (11).

4. A drainage system according to claim 3, characterized in that the height of the supporting feet (51) is H, the height H is 50cm > H is greater than or equal to 10cm, the filter screen (5) is provided with filter holes, and the aperture of the filter holes is greater than 1cm.

5. A drainage system according to claim 1, characterized in that the float (4) is located below the water outlet (20) in a position in which the liquid level rises to the water outlet (20).

6. The drainage system according to claim 1, wherein the upper end of the inspection well (1) extends out of the ground (7) and is located above the ground (7), the distance between the top of the concealed pipe (2) and the ground (7) is h1, the distance between the bottom of the concealed pipe (2) and the inner bottom end of the inspection well (1) is h2, and the distances h1 and h2 satisfy that h1 is greater than or equal to 1m, and 0.8m > h2 is greater than or equal to 0.5m.

7. Drainage system according to claim 1, characterized in that the down pipe (2) and the inspection well (1) are arranged in sequence along a first direction, the down pipe (2) is gradually inclined downwards along the first direction, and the down slope of the down pipe (2) is 0.8-1.2%o.

8. The drainage system according to claim 1, wherein at least three water inlets (202) are arranged at intervals along the circumference of the concealed pipe (2), the concealed pipe (2) is a corrugated pipe with peaks (200) and valleys (201), the water inlets (202) are positioned at the valleys (201), a water permeable and corrosion resistant protective layer (21) is covered on the peripheral wall of the concealed pipe (2), and a coarse sand layer (22) is covered on the periphery of the protective layer (21).

9. The drainage system according to any one of claims 1 to 8, wherein a hole for the drainage pipe (32) to penetrate is formed in a position, above the ground (7), of a side wall of the inspection well (1), the ground (7) is recessed downwards to form a drainage ditch (6), the hole is located at the side of the drainage ditch (6), a part, after the drainage pipe (32) penetrates through the hole, is a water outlet section (321), and the water outlet section (321) is communicated with the drainage ditch (6).

10. A method for installing a drainage system is characterized in that the drainage system is the drainage system according to any one of claims 1-9, and the installation method sequentially comprises the following steps:

Step 1), exploring the topography of the saline-alkali soil, determining the depth and direction of laying the concealed pipe (2), then covering a water-permeable and corrosion-resistant protective layer (21) on the peripheral wall of the concealed pipe (2), and covering a coarse sand layer (22) on the periphery of the protective layer (21);

Step 2), the inspection well (1) is vertically buried underground, and the first end of the hidden pipe (2) is arranged in a through hole in the side wall of the inspection well (1) in a penetrating mode;

Step 3), a filter screen (5) which is transversely arranged is placed at the bottom of the accommodating cavity (11), and a space is reserved between the bottom wall of the filter screen (5) and the bottom wall of the accommodating cavity (11);

Step 4), placing a drainage pump (31) on the top surface of the filter screen (5), and when the water level in the accommodating cavity (11) of the inspection well (1) reaches the height of the water outlet (20) of the concealed pipe (2), controlling the drainage pump (31) to work by the floating body (4), and discharging the water in the accommodating cavity (11) outwards by the drainage pipe (32).