Drainage device and method suitable for downstream water level slope protection

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a drainage device and method suitable for a downstream water level revetment, seepage water in the revetment is drained into a drainage gallery through longitudinal and transverse drainage ditches of a foundation plane, a drainage steel pipe is arranged at an outlet of the drainage gallery, and a check valve is arranged at the tail end of the drainage steel pipe. When the downstream water level is lower than the drainage steel pipe, seepage water in the drainage gallery is drained into the downstream river channel through the drainage steel pipe. And when the downstream water level is higher than the drainage steel pipe, the downstream water level cannot flow back into the drainage gallery under the action of the check valve. It can be guaranteed that when the downstream water level is high, downstream flowing water cannot be poured into the slope protection foundation face, and the rock mass of the slope protection foundation face is not scoured and damaged; it can be guaranteed that when the downstream water level is lowered, seepage water of the slope protection foundation face can be rapidly and effectively drained into a downstream river channel, the uplift pressure of the slope protection foundation face is reduced, the slope protection and the foundation are prevented from being unstable and damaged, and the technical problem that the stability of the slope protection foundation can be reduced through an existing slope protection drainage mode can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower engineering, and in particular to a drainage device and method suitable for downstream water level slope protection. Background Art

[0002] In water conservancy and hydropower projects, the drainage system can effectively remove moisture from the slope protection to avoid water accumulation, infiltration and landslides, thereby improving the stability of the slope protection; at the same time, the drainage system can reduce the erosion and corrosion of the slope protection structure by water and extend the service life of the slope protection.

[0003] Slope protection generally adopts two methods: permeable drainage type and impermeable drainage type, but both methods have the following disadvantages: If the slope protection adopts permeable drainage type, when the downstream water level is high, the downstream dynamic water will enter the slope protection foundation through the slope protection drainage, which may cause the slope protection foundation to soften and become unstable and damaged under long-term action. If the slope protection adopts impermeable drainage type, when the downstream water level drops suddenly, the head difference between the slope protection foundation and the water body will increase, increasing the pressure of seepage water, making it impossible to effectively discharge the seepage water, increasing the uplift pressure of the slope protection, and thus reducing its stability. Water accumulation will also cause the rock of the slope protection foundation to soften, further weakening its supporting capacity and increasing the risk of landslides.

[0004] Therefore, the existing slope protection drainage type will reduce the stability of the slope protection foundation. Summary of the invention

[0005] The purpose of the present invention is to provide a drainage device and method suitable for downstream water level slope protection, which can solve the technical problem that the existing slope protection drainage type will reduce the stability of the slope protection foundation.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention designs a drainage device suitable for downstream water level slope protection, comprising a drainage structure arranged in the slope protection surface, and a backflow structure connected to the end of the drainage structure;

[0008] The drainage structure includes basic longitudinal and transverse drainage ditches arranged from top to bottom along the slope protection surface, drainage corridors arranged at the ends of the basic longitudinal and transverse drainage ditches, and drainage hoses connecting the basic longitudinal and transverse drainage ditches and the drainage corridors; the outlet of the drainage corridor corresponds to the water level line in the dry season, and the top inlet of the basic longitudinal and transverse drainage ditches corresponds to the water level line in the flood season;

[0009] The backflow structure is arranged at the outlet of the drainage gallery.

[0010] As a preferred solution, the backflow structure includes a drainage steel pipe and a check valve. The drainage steel pipe is arranged at the outlet of the drainage gallery, and the check valve is arranged at the outlet of the drainage steel pipe.

[0011] Furthermore, backflow structures are arranged on both sides of the outlet of the drainage gallery, and the backflow structures on both sides are arranged at an angle with the drainage gallery as the center.

[0012] Furthermore, each side includes a plurality of back-feed structures, and the plurality of back-feed structures are parallel to each other.

[0013] As a preferred solution, the drainage structure further comprises a basic drainage pipe arranged along the cross-sectional direction of the slope protection, and the outlet of the basic drainage pipe is located in the foundation longitudinal and transverse drainage ditch.

[0014] Furthermore, there are multiple basic drainage pipes, which are arranged in parallel and at intervals within the slope protection cross section.

[0015] As a preferred solution, the longitudinal and transverse drainage ditches of the foundation are backfilled with filter materials.

[0016] The present invention also provides a drainage method suitable for downstream water level slope protection, comprising the following steps:

[0017] The foundation seepage water in the slope protection enters the foundation longitudinal and transverse drainage ditches through the foundation drainage pipe;

[0018] After being collected in the vertical and horizontal drainage ditches of the foundation, they enter the drainage corridor through drainage hoses;

[0019] The direction of water flow in the drainage corridor is determined according to the downstream water level; when the downstream water level is low, it is discharged directly into the downstream river through the drainage steel pipe via the check valve; when the downstream water level is high, due to the one-way flow effect of the check valve, the water in the downstream river will not flow back into the drainage corridor.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a drainage device and method suitable for downstream water level slope protection, which can ensure that when the downstream water level is high, the downstream moving water will not flow into the slope protection foundation surface, causing scouring and damage to the rock mass of the slope protection foundation surface; and can ensure that when the downstream water level is reduced, the seepage water on the slope protection foundation surface can be quickly and effectively discharged into the downstream river channel, reducing the uplift pressure on the slope protection foundation surface and avoiding the slope protection and foundation from being unstable and damaged. The present invention can solve the technical problem that the existing slope protection drainage type will reduce the stability of the slope protection foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the layout of the hydraulic structure of the present invention;

[0023] Figure 2It is a typical cross-sectional view of the structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 AA section view;

[0025] Figure 4 This is a structural plan view of the outlet of the drainage gallery of the present invention;

[0026] Figure 5 It is a flow chart of the present invention.

[0027] Description of reference numerals:

[0028] 1-slope protection; 2-drainage corridor; 3-drainage steel pipe; 4-check valve; 5-foundation drainage pipe; 6-drainage hose; 7-foundation longitudinal and transverse drainage ditches. DETAILED DESCRIPTION

[0029] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "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" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] 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 or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and 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 according to specific circumstances.

[0032] In view of the deficiencies of the prior art, the present invention proposes a drainage device and method suitable for downstream water level slope protection. The device and method of the present invention can ensure that when the downstream water level is high, the downstream dynamic water will not flow into the slope protection foundation surface, causing scouring and damage to the rock mass of the slope protection foundation surface; it can also ensure that when the downstream water level is lowered, the seepage water on the slope protection foundation surface can be quickly and effectively discharged into the downstream river channel, reducing the uplift pressure on the slope protection foundation surface, and avoiding the instability and damage of the slope protection and foundation. The present invention discharges the seepage water in the slope protection into the drainage corridor through the longitudinal and transverse drainage ditches on the foundation surface. The drainage corridor outlet is provided with a drainage steel pipe, and a check valve is provided at the end of the drainage steel pipe. When the downstream water level is lower than the drainage steel pipe, the seepage water in the drainage corridor is discharged into the downstream river channel through the drainage steel pipe. When the downstream water level is higher than the drainage steel pipe, under the action of the check valve, the downstream water level will not flow back into the drainage corridor. The test shows that the device and method of the present invention can ensure that the seepage of the slope protection and the foundation surface can be smoothly discharged through the drainage device, reduce the uplift pressure of the foundation slope protection, and avoid the problem of stability damage of the slope protection. As a whole, the present invention has a simple design, is easy to construct, and has good reliability. It is particularly suitable for downstream high water level slope protection drainage devices, and can also be promoted and applied in other similar water conservancy and hydropower projects.

[0033] The invention relates to a drainage device suitable for downstream water level slope protection, comprising a drainage structure arranged in the slope protection surface, and a backflow structure connected to the end of the drainage structure.

[0034] The drainage structure includes a basic longitudinal and transverse drainage ditch 7 arranged from top to bottom along the slope protection surface, a drainage gallery 2 arranged at the end of the basic longitudinal and transverse drainage ditch 7, a drainage hose 6 connecting the basic longitudinal and transverse drainage ditch 7 and the drainage gallery 2, and a basic drainage pipe 5 arranged along the cross-sectional direction of the slope protection. The outlet of the basic drainage pipe 5 is located in the basic longitudinal and transverse drainage ditch 7. There are multiple basic drainage pipes 5, which are arranged in parallel and at intervals in the cross-sectional direction of the slope protection. The basic longitudinal and transverse drainage ditch 7 is backfilled with anti-filter material.

[0035] The backfill structure is arranged at the outlet of the drainage gallery 2. The backfill structure includes a drainage steel pipe 3 and a check valve 4. The drainage steel pipe 3 is arranged at the outlet of the drainage gallery 2, and the check valve 4 is arranged at the outlet of the drainage steel pipe 3. Backfill structures are arranged on both sides of the outlet of the drainage gallery 2, and the backfill structures on both sides are arranged at an angle with the drainage gallery 2 as the center. Each side includes multiple backfill structures, and the multiple backfill structures are parallel to each other.

[0036] The outlet of the drainage corridor 2 corresponds to the water level in the dry season, and the top inlet of the basic longitudinal and transverse drainage ditches 7 corresponds to the water level in the flood season.

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be construed as limiting the present invention.

[0038] like Figure 1 , 2 As shown, the drainage device of the present invention is suitable for downstream water level slope drainage, and the drainage device includes a drainage gallery 2, a drainage steel pipe 3, a check valve 4, a foundation drainage pipe 5, a drainage hose 6, and a foundation longitudinal and transverse drainage ditch 7. The foundation of the slope protection 1 is provided with longitudinal and transverse drainage ditches 7, and drainage hoses 6 are laid in the drainage ditches 7. The foundation seepage in the slope protection 1 is collected into the drainage gallery 2 through the longitudinal and transverse drainage ditches 7 and the drainage hoses 6. The other parts of the foundation longitudinal and transverse drainage ditches 7 are backfilled with anti-filter materials, and the outlets of the slope protection foundation drainage pipes are all located in the drainage ditches 7. The seepage in the longitudinal and transverse drainage ditches 7 is collected into the drainage gallery 2 through the drainage hoses 6.

[0039] like Figure 3 As shown, a preferred embodiment is: in the above scheme, the vertical and horizontal drainage ditches 7 of the foundation are backfilled with filter materials, and the filter materials are gravel cushion layers (particle size D = 5-30 mm).

[0040] like Figure 2 As shown, a preferred embodiment is: in the above scheme, the outlets of the foundation drainage pipes 5 are both located in the foundation longitudinal and transverse drainage ditches 7.

[0041] like Figure 4 As shown, the preferred embodiment is: in the above scheme, a drainage steel pipe 3 is set at the outlet of the drainage corridor 2, and a check valve 4 is set at the outlet of the drainage steel pipe 3 to prevent the downstream water from flowing back into the drainage corridor 2 when the downstream water level rises, causing the slope protection foundation to soften, thereby reducing its stability. Figure 4 The direction indicated by the middle arrow is the drainage direction. Due to the one-way flow effect of the check valve, the water in the downstream river will not flow back into the drainage corridor.

[0042] When the downstream water level is lower than the top of the drainage steel pipe 3, the seepage water in the drainage corridor 2 is discharged into the downstream river channel through the drainage steel pipe 3, which can effectively prevent the downstream dynamic water from entering the slope protection foundation through the slope protection drainage and causing the slope protection foundation to soften.

[0043] When the downstream water level is higher than the top of the drainage steel pipe 3, under the action of the check valve 4, the downstream water level will not flow back into the drainage corridor 2, which can effectively prevent the downstream moving water from entering the slope protection foundation through the drainage corridor 2, causing the slope protection foundation to soften, increase the uplift pressure of the slope protection, and thus reduce its stability.

[0044] like Figure 5 As shown, the present invention also relates to a drainage method suitable for downstream water level slope protection, comprising the following steps:

[0045] The foundation seepage water in the slope protection enters the foundation longitudinal and transverse drainage ditches through the foundation drainage pipe;

[0046] After being collected in the vertical and horizontal drainage ditches of the foundation, they enter the drainage corridor through drainage hoses;

[0047] The direction of water flow in the drainage corridor is determined according to the downstream water level; when the downstream water level is low, it is discharged directly into the downstream river through the drainage steel pipe via the check valve; when the downstream water level is high, due to the one-way flow effect of the check valve, the water in the downstream river will not flow back into the drainage corridor.

[0048] It should be understood that the specific order or hierarchy of steps in the process disclosed by the present invention is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims provide the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0049] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims. The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel.

Claims

1. A drainage device suitable for downstream water level slope protection, characterized in that: It includes a drainage structure arranged in the slope protection surface, and a backflow structure connected to the end of the drainage structure; The drainage structure comprises a basic longitudinal and transverse drainage ditch (7) arranged from top to bottom along the slope protection surface, a drainage gallery (2) arranged at the end of the basic longitudinal and transverse drainage ditch (7), and a drainage hose (6) connecting the basic longitudinal and transverse drainage ditch (7) and the drainage gallery (2); the outlet of the drainage gallery (2) corresponds to the water level line in the dry season, and the top inlet of the basic longitudinal and transverse drainage ditch (7) corresponds to the water level line in the flood season; The backflow structure is arranged at the outlet of the drainage gallery (2).

2. A drainage device suitable for downstream water level slope protection according to claim 1, characterized in that: The backflow structure comprises a drainage steel pipe (3) and a check valve (4); the drainage steel pipe (3) is arranged at the outlet of the drainage gallery (2); and the check valve (4) is arranged at the outlet of the drainage steel pipe (3).

3. A drainage device suitable for downstream water level slope protection according to claim 2, characterized in that: Backflow structures are arranged on both sides of the outlet of the drainage gallery (2), and the backflow structures on both sides are arranged at an angle with the drainage gallery (2) as the center.

4. A drainage device suitable for downstream water level slope protection according to claim 3, characterized in that: Each side includes a plurality of back-feed structures, and the plurality of back-feed structures are parallel to each other.

5. A drainage device suitable for downstream water level slope protection according to claim 1, characterized in that: The drainage structure further comprises a basic drainage pipe (5) arranged along the cross-sectional direction of the slope protection, and the outlet of the basic drainage pipe (5) is located in the basic longitudinal and transverse drainage ditches (7).

6. A drainage device suitable for downstream water level slope protection according to claim 5, characterized in that: The basic drainage pipes (5) are multiple and are arranged in parallel and at intervals within the cross section of the slope protection.

7. A drainage device suitable for downstream water level slope protection according to claim 1, characterized in that: The vertical and horizontal drainage ditches (7) of the foundation are backfilled with anti-filter materials.

8. A drainage method suitable for downstream water level slope protection, characterized in that: The following steps are included: The foundation seepage water in the slope protection enters the foundation longitudinal and transverse drainage ditches (7) through the foundation drainage pipe (5); After being collected in the longitudinal and transverse drainage ditches (7) of the foundation, the water enters the drainage gallery (2) through the drainage hose (6); The direction of water flow in the drainage corridor (2) is determined according to the downstream water level. When the downstream water level is low, the water is directly discharged into the downstream river channel through the drainage steel pipe (3) and the check valve (4). When the downstream water level is high, due to the one-way flow effect of the check valve (4), the water in the downstream river channel will not flow back into the drainage corridor (2).

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