Protective structure for seasonal flood-prone channel treatment project

Abstract

The utility model provides a protection structure for seasonal flood prone channel treatment engineering, and relates to the technical field of water and soil conservation engineering, the protection structure comprises a check dam body transversely arranged in a channel, the bottom of the check dam body extends downwards into the channel bottom, the gradient of the upstream face of the check dam body is larger than that of the downstream face of the check dam body, and the check dam body is arranged in the channel. An overflow opening is formed in the center of the top of the check dam body, a plurality of drainage holes are formed in the dam face of the check dam body and are through holes, a splayed upstream wall is arranged on one side of the upstream face of the check dam body and comprises two parapet walls arranged on the two sides of a check dam abutment respectively, and the parapet walls extend outwards in the inclined direction from the two sides of the check dam abutment. A splayed outline is formed between the protective walls, the splayed upstream wall extends into the groove side slopes on the two sides in the unfolding direction of the splayed upstream wall, and the check dam body and the splayed upstream wall are integrally formed through concrete. Water flow erosion can be effectively relieved, dam abutment streaming can be prevented, the ditch bed is fixed, and therefore the water and soil conservation effect of the seasonal flood prone ditch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil and water conservation engineering, in particular to a protective structure used for seasonal flood-prone channel management engineering. Background Art

[0002] Gully erosion is one of the main manifestations of soil and water loss in the Loess Plateau region of Northwest China. It is fast and has a great impact, seriously threatening the local ecological environment and agricultural production. Gullies, as earth and stone buildings built in gullies prone to erosion, play an important role in soil and water conservation and gully management. Their main functions include improving gully stability, intercepting sediment, and slowing down water flow.

[0003] The existing ravine structures are diverse, including earth ravines, stone ravines, concrete ravines and other types. Appropriate ravine forms are selected according to different regions and needs. However, there are many seasonal gullies in the Loess Plateau in the northwest, the soil is mostly gravel, the vegetation on the slopes on both sides is sparse, and the flood retention effect is weak. When encountering high-intensity, short-term torrential rain, it is easy to produce strong confluence. The existing ravine structures have problems of dam shoulder erosion and back water surface erosion, and are particularly susceptible to strong current impacts. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a protective facility for seasonal flood-prone channel management projects, which aims to reduce water erosion, prevent dam shoulder flow, and fix the channel bed, and adopts the following technical solutions:

[0005] A protective structure for a seasonal flood-prone ditch regulation project comprises a dam body arranged transversely in the ditch, the bottom of the dam body extending downward into the ditch bottom, the slope of the water-facing surface of the dam body being greater than the slope of the water-receiving surface of the dam body, an overflow outlet is provided at the center of the top of the dam body, a plurality of drainage holes are provided on the dam surface of the dam body, the drainage holes are through holes, an eight-shaped water-facing wall is provided on one side of the water-facing surface of the dam body, the eight-shaped water-facing wall comprises two retaining walls respectively arranged on both sides of the dam shoulder, the retaining walls are obliquely extended outward from both sides of the dam shoulder, an eight-shaped outline is formed between the retaining walls, the eight-shaped water-facing wall penetrates into the ditch slopes on both sides along the extension direction, and the dam body and the eight-shaped water-facing wall are integrally formed of concrete.

[0006] By adopting the above technical scheme, the lateral setting of the Gufang dam body and the bottom extending downward into the ditch bottom can effectively fix the ditch bed, reduce water erosion, prevent ditch bottom cutting and ditch bank collapse, the overflow port and multiple drainage holes opened at the center of the top of the Gufang dam body can control the flow of water and effectively remove the accumulated water to prevent the accumulated water from damaging the structure, the eight-shaped water-facing wall is set on the water-facing surface, which can gradually reduce the speed and impact force of the water flow, thereby protecting the dam shoulder from water scouring and erosion. The eight-shaped water-facing wall and the Gufang dam body are integrally formed to enhance its structural stability and reduce the possibility of the Gufang dam body being impacted by water flow. At the same time, it can also prevent the erosion of water flow bypassing the structure, which can enhance the stability of the Gufang dam body and reduce the possibility of the Gufang dam shoulder being eroded by bypass flow.

[0007] Furthermore, the water-facing and water-receiving surfaces of the Gufang Dam are both smooth slopes, with the slope ratio of the water-facing surface of the Gufang Dam being 1:0.1 and the slope ratio of the water-receiving surface of the Gufang Dam being 1:0.7.

[0008] By adopting the above technical scheme, compared with the stepped structure, the smooth slope reduces the resistance of water flow and reduces the siltation, which is beneficial to keeping the ditch unobstructed. The slope of the water-facing surface of the Gufang dam is larger, so that the water flow is guided to the overflow port, which can reduce the scouring and erosion of the ditch bed by the water flow, and is also beneficial to the water flow control and drainage of the ditch. The slope of the back water surface of the Gufang dam is gentler, which helps prevent the water flow from passing over the top of the Gufang and reduces the risk of scouring and erosion of the back water surface foundation.

[0009] Furthermore, the shoulders on both sides of the Gufang dam body extend laterally into the channel slopes on both sides.

[0010] By adopting the above technical solution, the shoulders of the two sides of the Gufang dam body are extended laterally into the channel slopes on both sides, which can increase the combined area between the Gufang and the channel slopes, improve the stability of the structure, and reduce the risk of displacement or tilt of the structure due to external forces. Since the shoulders of the Gufang dam body are extended laterally into the channel slopes on both sides, a tighter combination is formed, which can effectively prevent water from penetrating into the slopes from both sides of the Gufang dam body, reduce the erosion and dissolution of the channel slopes, and help protect the stability of the slopes.

[0011] Furthermore, coupling grooves are respectively provided downwardly at the tops of the dam shoulders on both sides of the Gufang dam body, and the coupling grooves are located at the longitudinal rear side of the eight-shaped water-facing wall in the lateral position of the Gufang dam body.

[0012] By adopting the above technical solution, the combined groove can reduce the impact of water flow on the structure to a certain extent. When the water flow hits, the combined groove can better guide the water flow, reduce the erosion of the soil around the Gufang dam body by the water flow, and also help to reduce the impact of the water flow on the Gufang dam body.

[0013] Furthermore, an energy dissipation pool is provided downstream of the Gufang dam body near the back water surface of the Gufang dam body. The energy dissipation pool is arranged longitudinally according to the channel slope. The width of the energy dissipation pool is consistent with the actual width of the channel bottom at the location of the Gufang. A tooth wall is provided at the end of the energy dissipation pool.

[0014] The above technical solution can effectively slow down the speed of water flow through the valley. After the water flows through the overflow port of the valley dam, it flows downstream along the back water surface. Due to the design of the stilling pool, the water flow is hindered and gradually slows down, thereby reducing the impact of the water flow on the valley and its surrounding environment, and reducing the possibility of water erosion. The end of the stilling pool is provided with a tooth wall, which can further enhance the protective effect of the stilling pool. The setting of the tooth wall can effectively disperse the energy of the water flow, reduce the erosion of the end of the stilling pool and the foundation of the back water surface of the valley, and improve the stability and durability of the structure.

[0015] Furthermore, a drainage pipe is arranged in the drainage hole, and the drainage pipe is a PVC pipe. The PVC pipe material has good corrosion resistance and a smooth inner wall, which is conducive to smooth drainage.

[0016] Furthermore, the Gufang dam body adopts C25 concrete, and the frost resistance grade of the C25 concrete is not less than F200. C25 concrete has high compressive strength and durability, can withstand the impact of water flow and long-term erosion of the channel environment, and maintain the stability and integrity of the structure.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The protective structure provided by the utility model for the management project of seasonal flood-prone ditches can effectively reduce water erosion, prevent dam shoulder bypass, and fix the ditches, thereby improving the soil and water conservation effect of seasonal flood-prone ditches and reducing the risk of floods.

[0019] The utility model arranges an eight-shaped water-facing wall on the water-facing surface of the Gufang dam body, which can enhance the stability of the structure, prevent erosion and bypass of the dam shoulder, and improve the impact resistance and service life of the project.

[0020] The utility model can prevent bypass flow to a certain extent and play a role in guiding water flow by providing a combining groove which is arranged at the longitudinal rear side of the eight-shaped water-facing wall at the transverse position of the Gufang dam body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the plan layout diagram of the valley workshop in the embodiment of the utility model;

[0022] Figure 2 It is a longitudinal section view of the valley workshop in the embodiment of the utility model;

[0023] Figure 3It is a cross-sectional view of the valley workshop in the embodiment of the utility model.

[0024] In the figure: 1. Gufang dam body; 2. Combination trough; 3. S-shaped water-facing wall; 4. Energy dissipation pool; 5. Water-facing surface of Gufang dam body; 6. Back-facing surface of Gufang dam body; 7. Overflow outlet; 8. Drainage hole; 9. Ditch bottom; 10. Tooth wall. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0027] Reference Figures 1 to 3 The present embodiment provides a protective structure for a seasonal flood-prone channel regulation project. The protective structure is made of concrete material and includes a Gufang dam body 1, an eight-shaped water-facing wall 3 arranged on the water-facing surface of the Gufang dam body, a coupling groove 2 opened on the top of the dam shoulders on both sides of the Gufang dam body 1, and a stilling pool 4 at a location 6 near the back water surface of the Gufang dam body downstream of the Gufang dam body 1. The total height of the Gufang dam body 1 is 3.5m, the top width is 0.7m, the slope ratio of the water-facing surface 5 of the Gufang dam body is 1:0.1, and the slope ratio of the back water surface 6 of the Gufang dam body is 1:0.7;

[0028] An overflow port 7 is provided at the center of the top of the Gufang dam body 1, and a plurality of drainage holes 8 are provided on the dam surface of the Gufang dam body 1, wherein the drainage holes 8 are through holes;

[0029] The eight-shaped water-receiving wall 3 arranged on one side of the water-receiving surface 5 of the Gufang dam body is a concrete structure integrally formed with the Gufang dam body 1. The eight-shaped water-receiving wall 3 is composed of two independently arranged retaining walls on both sides of the Gufang dam shoulder, which are connected to the Gufang dam body 1 to form an overall stable structure. The angle between the retaining walls is in an outward eight-shaped shape, spreading outward from both sides of the Gufang dam shoulder to form an eight-shaped outline. Each retaining wall is made of concrete material with good impact resistance and has a smooth and flat surface to ensure good stability under the impact of water flow. The design of the eight-shaped water-receiving wall 3 is intended to effectively resist the impact of water flow and disperse the impact force, reducing the erosion and bypass phenomenon of the water flow on the shoulder of the Gufang dam. The eight-shaped water-receiving wall 3 is integrally formed with the Gufang dam body 1, which can effectively protect the water-receiving surface of the Gufang from the influence of water flow erosion and enhance the stability of the overall structure;

[0030] The shoulders of the Gufang dam body 1 extend laterally into the channel slopes on both sides. The combining grooves 2 are respectively opened on both sides of the shoulders of the Gufang dam and are integrally formed with the concrete of the Gufang dam body 1. The combining grooves 2 are located behind the eight-shaped water-receiving wall 3 to prevent water from seeping from both sides of the eight-shaped water-receiving wall 3 and enhance the structural stability. The energy dissipation pool 4 is located downstream of the Gufang dam body 1 to slow down the flow rate of floods, increase the ability to prevent and control erosion after silting, and reduce the erosion of the foundation of the Gufang back water surface 6 by water flow. The energy dissipation pool 4 is arranged longitudinally according to the slope of the channel bottom 9. The width of the energy dissipation pool 4 is consistent with the actual width of the channel bottom 9 at the location of the Gufang dam body 1, and a tooth wall 10 is provided at the end of the energy dissipation pool 4.

[0031] Preferably, a drainage pipe is provided in the drainage hole 8, and the drainage pipe is a PVC pipe.

[0032] Preferably, the Gufang dam body 1 adopts C25 concrete, and the frost resistance grade of the C25 concrete is not lower than F200.

[0033] The working principle of this embodiment:

[0034] In severe weather such as heavy rain, the water flow in the channel forms a strong impact, and the Gufang Dam body 1 plays a role as a protective structure. First, the eight-shaped water-receiving wall 3 blocks the erosion of the slopes on both sides of the dam shoulder by the water flow, protecting the stability of the structure of the Gufang Dam body 1. When the water flow is too large and passes over the top of the Gufang Dam body 1, the combined groove 2 plays a role, reducing the erosion of the slopes on both sides of the dam shoulder by the water flow, and effectively preventing the bypass of the dam shoulder, enhancing the protective effect of the Gufang Dam body 1. At the same time, the setting of the downstream stilling pool 4 can slow down the flow rate, reduce the erosion of the water flow on the back water surface 6 of the Gufang Dam body, and play a role in protecting the foundation of the Gufang.

Claims

1. A protective structure for a seasonal flood-prone channel control project, comprising a dam body disposed transversely in the channel, characterized in that: The bottom of the Gufang dam body extends downward into the bottom of the ditch, the slope of the water-facing surface of the Gufang dam body is greater than the slope of the water-retaining surface of the Gufang dam body, an overflow port is opened at the center of the top of the Gufang dam body, and a plurality of drainage holes are opened on the dam surface of the Gufang dam body, and the drainage holes are through holes. An eight-shaped water-facing wall is provided on one side of the water-facing surface of the Gufang dam body, and the eight-shaped water-facing wall includes two guard walls respectively arranged on both sides of the Gufang dam shoulder, and the guard walls are obliquely expanded outward from both sides of the Gufang dam shoulder, and an eight-shaped outline is formed between the guard walls. The eight-shaped water-facing wall goes deep into the channel slopes on both sides along its expansion direction, and the Gufang dam body and the eight-shaped water-facing wall are integrally formed of concrete.

2. A protective structure for seasonal flood prone channel management engineering according to claim 1, characterized in that: The water-facing and water-receiving surfaces of the Gufang Dam are both smooth slopes, with the slope ratio of the water-facing surface of the Gufang Dam being 1:0.1, and the slope ratio of the water-receiving surface of the Gufang Dam being 1:0.

7.

3. A protective structure for seasonal flood prone channel management engineering according to claim 1, characterized in that: The shoulders on both sides of the Gufang dam body extend laterally into the channel slopes on both sides.

4. A protective structure for seasonal flood prone channel management engineering according to claim 3, characterized in that: The tops of the dam shoulders on both sides of the Gufang dam body are respectively provided with coupling grooves downwards, and the coupling grooves are located at the longitudinal rear side of the eight-shaped water-facing wall in the lateral position of the Gufang dam body.

5. A protective structure for seasonal flood prone channel management engineering according to claim 4, characterized in that: An energy dissipation pool is provided downstream of the dam body, near the back water surface of the dam body. The energy dissipation pool is arranged longitudinally according to the channel slope. The width of the energy dissipation pool is consistent with the actual width of the channel bottom at the location of the dam. A tooth wall is provided at the end of the energy dissipation pool.

6. A protective structure for seasonal flood prone channel management engineering according to claim 1, characterized in that: A drainage pipe is arranged in the drainage hole, and the drainage pipe is a PVC pipe.

7. A protective structure for seasonal flood prone channel management engineering according to any one of claims 1 to 6, characterized in that: The Gufang dam body is made of C25 concrete, and the frost resistance grade of the C25 concrete is not lower than F200.

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