Stepped debris flow silt arrester

Abstract

The utility model discloses a stepped debris flow silt arrester which comprises a dam body foundation, a dam body main body, stepped water retaining strips and drainage holes. The dam body main body is fixedly connected to the upper surface of the dam body foundation, and a step structure is arranged on the downstream face of the dam body main body; the two stepped water retaining strips are arranged side by side and fixedly connected to the upper surface of the dam body foundation, and the stepped structure is located between the two stepped water retaining strips. The drain hole is formed in the side wall of the dam main body in a penetrating manner, and the drain hole penetrates through the step structure; wherein the top surface of the stepped water retaining strip is an inclined surface. The silt arrester can reduce the flow speed of debris flow, dissipate part of energy of the debris flow, buffer impact force of the debris flow and dimension stones, enhance the stability of the dam body, reduce the erosion effect of the surrounding of the dam body caused by diffusion of the overflowed debris flow concentrated on the stepped structure, and prolong the service life of the silt arrester.

Description

Technical Field

[0001] This utility model relates to the field of debris flow prevention and control technology, and in particular to a stepped debris flow retaining dam. Background Technology

[0002] Debris flow prevention and control projects in the Loess Plateau region face new challenges. Especially in areas like Gansu and Shaanxi, the unique properties of loess, particularly after heavy rainfall, make them highly susceptible to large-scale debris flows, causing immense damage to the surrounding environment. Therefore, more innovative exploration is needed to address the challenges of prevention and control projects. Debris flow engineering measures are the most commonly used and effective prevention and control methods, including retaining walls, check dams, drainage channels, aqueducts, and open trenches, among which check dams are the most frequently used engineering measure.

[0003] The disaster has triggered extremely serious debris flow disasters in Longnan, Gansu Province. In these disasters, frequent earthquakes, coupled with concentrated and heavy rainfall, cause large amounts of precipitation in a short period of time to saturate the soil on the hillsides and loose deposits in the valleys, thus triggering debris flows. The debris flows move at high speeds and have extremely strong impact and destructive power.

[0004] Existing debris flow dam technologies cannot effectively reduce some of the energy of debris flows or mitigate the impact of debris flows and large rocks on the dam body.

[0005] Therefore, a stepped debris flow retaining dam is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a stepped debris flow retaining dam, which aims to solve or improve at least one of the above-mentioned technical problems.

[0007] To achieve the above objectives, this utility model provides the following solution: This utility model provides a stepped debris flow retaining dam, comprising:

[0008] Dam foundation;

[0009] The dam body is fixed to the upper surface of the dam foundation, and the backwater side of the dam body is provided with a stepped structure.

[0010] A stepped water-retaining strip, wherein two stepped water-retaining strips are arranged side by side, and both stepped water-retaining strips are fixed to the upper surface of the dam foundation, and the stepped structure is located between the two stepped water-retaining strips;

[0011] The drainage hole is formed through the side wall of the main body of the dam and extends through the stepped structure;

[0012] The top surface of the stepped water-blocking strip is designed as an inclined surface.

[0013] According to the present invention, a stepped debris flow retaining dam is provided, wherein the height of each set of steps in the stepped structure is 1 / 15 to 1 / 3 of the height of the main body of the dam; and the width of each set of steps in the stepped structure is 1 / 4 to 5 / 4 of the top surface width of the main body of the dam.

[0014] According to the present invention, a stepped debris flow retaining dam is provided, wherein the height of each set of steps in the stepped structure is no more than 5 meters, and the width of each set of steps in the stepped structure is no more than 5 meters.

[0015] According to the present invention, a stepped debris flow retaining dam has a slope ratio of 1:1 to 1:3 on the back side of the dam body and a slope ratio of 1:0.1 to 1:0.05 on the front side of the dam body.

[0016] According to the present invention, a stepped debris flow retaining dam is provided, wherein the main body of the dam is a concrete dam body.

[0017] According to the present invention, a stepped debris flow retaining dam is provided, wherein the height of the stepped water-retaining strip is 0.3 to 1.8 times the height of each set of steps in the stepped structure.

[0018] According to the present invention, a stepped debris flow retaining dam is provided, wherein the drainage hole is located at 1 / 2 to 2 / 3 of the height of the stepped structure.

[0019] According to the present invention, a stepped debris flow retaining dam is provided, wherein the cross-sectional shape of the drainage hole is square, and the side length of the square is equal to the height of each set of steps in the stepped structure.

[0020] The present invention discloses the following technical effects:

[0021] This utility model addresses the impact resistance requirements of debris flow retaining dams. Combining the characteristics of debris flow movement, it incorporates a stepped structure on the backwater side of the dam body to reduce the flow velocity of debris flow, dissipate some of the energy of debris flow, and buffer the impact force of debris flow and boulders. Two stepped water-retaining strips concentrate the overflowing debris flow under the stepped structure, reducing its diffusion and erosion around the dam body, and increasing the service life of the retaining dam.

[0022] In this invention, the top surface of the stepped water-retaining strip is set as an inclined surface, which makes the stepped water-retaining strip have a triangular slope structure, which enhances the stability of the dam body, reduces its construction cost, and significantly improves economic benefits. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an isometric view of the present invention;

[0025] Figure 2 This is a side view of the present invention;

[0026] Figure 3 This is the front view of the present invention;

[0027] Figure 4 This is a top view of the present invention.

[0028] The components include: 1. Dam foundation; 2. Dam body; 3. Stepped water-retaining strips; 4. Stepped structure; 5. Drainage hole; 6. Sloping surface; 7. Water-facing surface; 8. Water-receiving surface. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1-4 This utility model provides a stepped debris flow retaining dam, comprising:

[0032] Dam foundation 1;

[0033] The dam body 2 is fixed to the upper surface of the dam foundation 1, and the backwater side 8 of the dam body 2 is provided with a stepped structure 4.

[0034] There are two stepped water-retaining strips 3 arranged side by side. Both stepped water-retaining strips 3 are fixed to the upper surface of the dam foundation 1. The stepped structure 4 is located between the two stepped water-retaining strips 3.

[0035] A spillway 5 is formed by penetrating the side wall of the main dam body 2 and extending through the stepped structure 4. The spillway 5 is located at the center of the second step from the top of the stepped structure 4. Figure 2 Drainage hole 5 is a through hole along the direction of debris flow indicated by the arrow;

[0036] Among them, the top surface of the stepped water-blocking strip 3 is set as an inclined surface 6;

[0037] With this design, this utility model addresses the impact resistance requirements of debris flow retaining dams. Combining the characteristics of debris flow movement, a stepped structure 4 is provided on the backwater surface 8 of the main body 2 of the dam to reduce the flow velocity of debris flow, dissipate some of the energy of debris flow, and buffer the impact force of debris flow and boulders. Two stepped water-retaining strips 3 concentrate the overflowing debris flow under the stepped structure 4, reducing its diffusion and erosion around the dam body, and increasing the service life of the retaining dam.

[0038] In this utility model, the top surface of the stepped water-retaining strip 3 is set as an inclined surface, so that the stepped water-retaining strip 3 has a triangular slope structure, which enhances the stability of the dam body, reduces its construction cost, and significantly improves economic benefits.

[0039] Further optimization of the scheme: the height (h) of each set of steps in the stepped structure 4 is 1 / 15 to 1 / 3 of the height (H) of the main body of the dam 2; the width (d) of each set of steps in the stepped structure 4 is 1 / 4 to 5 / 4 of the top surface width (B) of the main body of the dam 2.

[0040] Further optimization of the scheme: the height (h) of each set of steps in the stepped structure 4 shall not exceed 5 meters, and the width (d) of each set of steps in the stepped structure 4 shall not exceed 5 meters.

[0041] Further optimization of the scheme: the slope ratio of the backwater side 8 of the main body 2 of the dam body is 1:1 to 1:3, and the slope ratio of the water-facing side 7 of the main body 2 of the dam body is 1:0.1 to 1:0.05; the slope ratio refers to the ratio of the vertical height of the slope to the horizontal width of the bottom.

[0042] Further optimization of the plan resulted in the main body of the dam being a concrete dam body.

[0043] The scheme was further optimized so that the height of the stepped water-blocking strip 3 is 0.3 to 1.8 times the height of each set of steps in the stepped structure 4.

[0044] The design was further optimized so that the drainage hole 5 is located at 1 / 2 to 2 / 3 of the height of the stepped structure 4.

[0045] Further optimization of the design: the cross-sectional shape of the drainage hole 5 is square, and the side length of the square is equal to the height of each set of steps in the stepped structure 4.

[0046] The scheme is further optimized so that the height of the slope 6 is the height from the top to the bottom of the stepped water-retaining strip 3, the width is 1 / 3 of the width of the main body 2 of the outer side of the stepped dam, and the length is the length of the stepped structure 4.

[0047] Example 1

[0048] Reference Figure 1-4 The drainage area of ​​a certain debris flow gully is approximately 4.35 km². 2 The main gully is approximately 3.9 km long, with a maximum elevation of about 3517.0 m; the gully mouth elevation is about 1717.0 m, resulting in a relative elevation difference of about 1800.0 m. The gully is characterized by sparse debris flows. To prevent debris flow disasters, a stepped check dam with side wing foundations has been constructed within the gully. Specific parameters for the check dam are as follows:

[0049] Based on the debris flow channel conditions, the design plan includes a dam height of 15m and a shoulder width of approximately 2.0m; an overflow outlet top width of approximately 12.4m and a bottom width of approximately 6.2m; an overflow outlet height of approximately 2.5m; each step of the stepped structure 4 is approximately 2.5m high and each step has a horizontal thickness of approximately 2.8m; and the stepped water-retaining strip 3 is 3.3m high.

[0050] The slope ratio of the backwater side 8 is 1:3, and the slope ratio of the water-facing side of the dam body 2 is 1:0.3. The dam body 2 is made of concrete, and the concrete is C25 or C30; the spillway 5 is a rectangular opening, about 2.5m high and about 2.5m wide.

[0051] Example 2

[0052] Reference Figure 1-4 A debris flow gully has a drainage area of ​​approximately 25.75 km², a main gully length of approximately 6.8 km, and a highest elevation of approximately 3828.0 m. The gully mouth elevation is approximately 1340.0 m, resulting in a relative elevation difference of approximately 2488.0 m. The gully contains viscous debris flows. To prevent debris flow disasters, a stepped check dam with side wing foundations is constructed within the gully. Specific parameters for the check dam are as follows:

[0053] Based on the debris flow channel conditions, the design plan includes a dam height of 20m and a shoulder width of approximately 2.5m; an overflow outlet top width of approximately 15.5m and a bottom width of approximately 7.8m; an overflow outlet height of approximately 3.1m; a stepped structure 4 with each step approximately 3.1m high and each step horizontally thick approximately 3.5m; and a stepped water-retaining strip height of 4.1m.

[0054] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stepped debris dam, characterized in that, The utility model relates to a dam body foundation (1);Dam body main part (2), dam body main part (2) is fixedly connected on the upper surface of dam body foundation (1), and the backwater surface (8) of dam body main part (2) is equipped with ladder structure (4);Ladder water retaining bar (3), two ladder water retaining bars (3) are provided side by side, and two ladder water retaining bars (3) are fixedly connected on the upper surface of dam body foundation (1), and the ladder structure (4) is between two ladder water retaining bars (3); Drain hole (5) is set up on the side wall of dam body main part (2) and passes through the ladder structure (4); Wherein, the top surface of ladder water retaining bar (3) is inclined plane (6). The height of each group of steps of ladder structure (4) is 1 / 15~1 / 3 of the height of dam body main part (2);The width of each group of steps of ladder structure (4) is 1 / 4~5 / 4 of the top surface width of dam body main part (2). The height of each group of steps of ladder structure (4) is not greater than 5 meters, and the width of each group of steps of ladder structure (4) is not greater than 5 meters. The slope ratio of the backwater surface (8) of dam body main part (2) is 1:1~1:3, and the slope ratio of the water surface (7) of dam body main part (2) is 1:0.1~1:0.

05.

2. The step-type debris flow check dam according to claim 1, characterized in that: Dam body main part (2) is concrete dam body main part.

3. The step-type debris flow check dam according to claim 2, characterized in that: The height of ladder water retaining bar (3) is 0.3 times~1.8 times of the height of each group of steps of ladder structure (4).

4. The step-type debris flow check dam according to claim 1, characterized in that: Drain hole (5) is located at 1 / 2~2 / 3 of the height of ladder structure (4).

5. The step-type debris flow check dam according to claim 1, characterized in that: The cross-sectional shape of drain hole (5) is square, and the side length of the square is equal to the height of each group of steps of ladder structure (4).

6. The step-type debris flow check dam according to claim 1, characterized in that: ​ 7. The step-type debris flow check dam according to claim 1, characterized in that: ​ 8. The step-type debris flow check dam according to claim 1, characterized in that: ​

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