A road-side drainage device

Abstract

This invention relates to the field of drainage equipment technology, specifically to a roadside drainage device, comprising a rectangular drainage pipe, a pre-drainage component located on one side of the rectangular drainage pipe or on both sides of the rectangular drainage pipe, connected to the rectangular drainage pipe and discharging rainwater before the rectangular drainage pipe, reducing the rainwater flow velocity and intercepting silt; and a barrier net placed between the rectangular drainage pipe and the pre-drainage component to intercept debris such as leaves and dead branches. During light and moderate rain, rainwater flows into the pre-drainage component first, reducing the water flow velocity and intercepting silt. Leaves, dead branches, and other debris are intercepted by the barrier net, making it difficult for them to enter the rectangular drainage pipe, thus preventing debris accumulation and silt formation. Before heavy rain, frequent ditch cleaning is unnecessary; only simple cleaning of debris on the pre-drainage component and the barrier net is required, significantly reducing the difficulty of ditch cleaning and maintenance workload.

Description

Technical Field

[0001] This invention relates to the field of drainage equipment technology, and more specifically to a roadside drainage device. Background Technology

[0002] During rainy days, road drainage relies on storm drains or side ditches. The storm drains are relatively simple, consisting of spaced rectangular covered side ditches and culverts connecting the rectangular side ditches, relying on storm grates to block debris from entering. The side ditches are similar in shape to rectangular covered side ditches, with continuous side ditches guiding and draining rainwater.

[0003] Common roadside drains or storm drains can quickly drain rainwater during rainy weather. However, during heavy rain, the drainage efficiency of roadside drains is greatly affected by silt, fallen leaves, dead branches, and other debris inside. In particular, storm drains are more prone to blockage and slow drainage during heavy rain because most drainage pipes are culverts with limited area. Therefore, it is necessary to carefully inspect and clean storm drains and roadside drains before heavy rain to avoid potential blockages. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a roadside drainage device that can effectively solve the problems of how to reduce the difficulty of cleaning and cope with rainstorms in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a roadside drainage device, including a rectangular drainage pipe, and further comprising: The pre-drainage component is located on one side of the rectangular drain pipe or on both sides of the rectangular drain pipe. It is connected to the rectangular drain pipe and discharges rainwater before the rectangular drain pipe, reducing the rainwater flow rate and intercepting sediment. A barrier net is placed between the rectangular drain pipe and the pre-drainage assembly to intercept debris such as leaves and dead branches.

[0006] Furthermore, the barrier net includes a fixed net and a movable net that can slide up and down, with a buoyancy block fixedly installed at the bottom of the movable net; Once the rainwater reaches a certain height, the buoyancy block generates buoyancy and moves upward together with the movable net, causing the mesh openings of the movable net and the fixed net to overlap, thus expanding the flow area between the rectangular drainage pipe and the pre-drainage component. When the rainwater level is below a certain height, the movable netting is positioned low, and the mesh of the movable and fixed netting is interwoven, preventing silt from entering the rectangular drainage pipe.

[0007] Furthermore, the pre-drainage assembly includes a second rain grate, which has a longitudinal drainage groove and a reinforcing column installed laterally in the middle of the drainage groove.

[0008] Furthermore, the rectangular drain pipe includes a drain frame and a rain grate at the top of the drain frame, with both sides of the drain frame connected to the front drain assembly.

[0009] Furthermore, the pre-drainage assembly also includes a second drainage frame, the bottom plate of which is provided with multiple sand-accumulating protrusions. These protrusions reduce the water flow velocity and retain sediment.

[0010] Furthermore, water baffles are provided on both sides of the bottom plate of the drainage frame, the buoyancy block is flush with the height of the water baffles, and a cover plate is provided between the rectangular drainage pipe and the front drainage component to limit the floating height of the movable net; The baffle plate is used to increase the water level between the rectangular drain pipe and the pre-drainage assembly. When the water level exceeds the baffle plate, the buoyancy block is lifted by buoyancy.

[0011] Furthermore, symmetrically sliding limit pins are installed through the cover plate, and the top of the movable mesh is symmetrically provided with slots corresponding to the shape of the limit pins. The limit pins can slide in the slots to connect the cover plate and the movable mesh.

[0012] Furthermore, slots are provided in the middle of the two side plates of the drainage frame one for inserting the movable net, and the fixed net is located on the two side plates of the drainage frame one and is in close contact with the movable net; The second drainage frame has only one side panel, and the side without the side panel is distributed on one side of the drainage frame.

[0013] Furthermore, a slot for inserting a movable net is provided in the middle of one side plate of the second drainage frame, and the fixed net is located on the side plate of the second drainage frame, in close contact with the movable net, and the side plate of the second drainage frame with the movable net is in close contact with the side of the first drainage frame.

[0014] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. Effectively reduces blockage of rectangular drainage pipes and lowers the difficulty and frequency of ditch cleaning: During light and moderate rain, rainwater first flows into the pre-drainage components, where the water flow velocity is reduced, silt is intercepted, and debris such as leaves and dead branches are blocked by the barrier net, making it difficult for them to enter the rectangular drainage pipes, thus avoiding the accumulation of debris and the formation of silt; before heavy rain, there is no need to carry out ditch cleaning work frequently, only simple cleaning of debris on the pre-drainage components and barrier net is required, which greatly reduces the difficulty of ditch cleaning and the workload of maintenance.

[0015] 2. Adaptable to different rainfall scenarios: During heavy rain, the rising water level causes the movable net to move upward, and the mesh of the movable net overlaps with that of the fixed net, expanding the flow area. At the same time, the pre-drainage component and the rectangular drainage pipe work together to drain water and avoid obstruction of water flow. During light and moderate rain, the mesh is staggered, which can effectively block debris and mud while ensuring the normal drainage of the pre-drainage component. Drainage can be completed without rainwater entering the rectangular drainage pipe, adapting to the drainage needs of different rainfall.

[0016] 3. Optimized structural design: The drainage frame of the pre-drainage component can be designed as a single-side plate structure. The barrier net is installed on the side plate of the rectangular drainage pipe drainage frame, saving material. At the same time, the width between the rectangular drainage pipe and the pre-drainage component is shortened, reducing the overall footprint and adapting to the space requirements of different installation scenarios.

[0017] 4. Automatic adjustment of the barrier net, balancing barrier effect and anti-clogging: The movable mesh of the barrier net can automatically adjust the mesh state according to the water level. During light rain, the mesh holes are staggered, providing a good barrier effect and preventing silt and small debris from entering. During heavy rain, the mesh holes overlap, expanding the flow area. At the same time, high-speed water flow is used to flush away silt on the barrier net, preventing the barrier net itself from clogging and ensuring smooth drainage. The cover plate is removable, allowing easy removal of the movable net for cleaning. At the same time, the rain grate can be opened to clean silt and debris from the fixed net and the pre-drainage components. Maintenance and operation are convenient, extending the service life of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the separation structure according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of a rectangular drainage pipe structure according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram illustrating the cooperation between the movable mesh and the cover plate of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the second type of rainwater grate of the present invention; Figure 7 This is a schematic diagram of the limiting pin of the present invention; Figure 8This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the separation structure in Embodiment 2 of the present invention.

[0020] The labels in the diagram represent: 1. Rectangular drain pipe; 101. Drainage frame one; 102. Rain grate one; 103. Water baffle; 2. Pre-drainage assembly; 201. Drainage frame two; 202. Rain grate two; 203. Sand accumulation protrusion; 204. Drainage channel; 3. Barrier net; 301. Movable net; 302. Fixed net; 303. Buoyancy block; 304. Slot; 4. Cover plate; 5. Limiting pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Example 1: Refer to Figures 1 to 7 A roadside drainage device includes a rectangular drainage pipe 1, and further includes: The pre-drainage component 2 is located on one side of the rectangular drainage pipe 1 or on both sides of the rectangular drainage pipe 1. It is connected to the rectangular drainage pipe 1 and discharges rainwater before the rectangular drainage pipe 1, thereby reducing the flow rate of rainwater and intercepting sediment. The barrier net 3 is placed between the rectangular drain pipe 1 and the pre-drainage component 2 to intercept debris such as leaves and dead branches.

[0024] Furthermore, slots are provided in the middle of the two side plates of the drainage frame 101 for the insertion of the movable net 301, and the fixed net 302 is located on the two side plates of the drainage frame 101 and is in close contact with the movable net 301. The second drainage frame 201 has only one side panel, and the side without the side panel is distributed on the side of the first drainage frame 101.

[0025] In this embodiment, the rectangular drainage pipe 1 serves as a side ditch, requiring multiple sets of drainage frame 101 and drainage frame 201 to be arranged together. At this time, the side plate of drainage frame 101 can be used to install the movable net 301 and the fixed net 302, saving one side plate of drainage frame 201. Drainage frame 201 only needs to be made into a structure without a single side plate, that is, the cross-section of drainage frame 201 is L-shaped, which shortens the width between the rectangular drainage pipe 1 and the front drainage component 2, reducing the floor space. Each drainage frame 101 and drainage frame 201 is arranged closely end to end. Since it is a newly installed rectangular drainage pipe 1, the distance between the rectangular drainage pipe 1 and the roadside curb can be controlled. The distance between the rectangular drainage pipe 1 and the roadside can be appropriately increased to ensure that front drainage components 2 can be installed on both sides of the rectangular drainage pipe 1. If the conditions do not allow, only a single-sided front drainage component 2 is installed. In contrast, in this case, the other side of drainage frame 101 needs to be sealed and cannot have any gaps that allow water leakage.

[0026] Compared to the period of heavy rain, during light, medium, and heavy rain, rainwater may carry leaves, dead branches, and mud into rectangular drain pipe 1. In the case of heavy rain or torrential rain, leaves, dead branches, and mud will flow quickly in the pipe network under the rapid impact and entrainment of rainwater, and few debris will block rectangular drain pipe 1. However, in the case of light and moderate rain, leaves, dead branches, and mud will be washed into rectangular drain pipe 1 by rainwater. However, the water flow is slow and the impact force is small, so the debris is easy to accumulate in rectangular drain pipe 1. After the mud settles, it mixes with rainwater to form silt, which, combined with leaves and dead branches, is more likely to cause blockage. Therefore, before each heavy rain, the ditch should be cleared to avoid the water flow in rectangular drain pipe 1 being too slow and the flow channel diameter being too small during the heavy rain season.

[0027] The rectangular drainage pipe 1 can serve as a roadside rainwater inlet or as a single unit of a side ditch. The pre-drainage component 2 is an extension of the rectangular drainage pipe 1. It can be located on both sides of the rectangular drainage pipe 1 or only on one side of the rectangular drainage pipe 1. The installation of the pre-drainage component 2 needs to be based on the actual situation. The pre-drainage component 2 needs to be placed outside the rectangular drainage pipe 1. Rainwater needs to flow into the pre-drainage component 2 first. In the event of heavy rain, only the part of the rainwater that cannot flow through can flow into the rectangular drainage pipe 1.

[0028] During light to moderate rain, rainwater carrying leaves, twigs, and mud flows into the pre-drainage component 2. The pre-drainage component 2 has a certain drainage capacity, so during light to moderate rain, rainwater has difficulty crossing it to enter the rectangular drain pipe 1. When rainwater carrying mud, leaves, and twigs flows, it directly into the pre-drainage component 2 and lingers there. The barrier net 3 then blocks the leaves and twigs. Thus, during light or moderate rain, leaves, twigs, and mud are difficult to enter the rectangular drain pipe 1. During heavy rain, the clearing of the rectangular drain pipe 1 can be completed quickly, reducing the difficulty of clearing and making it easier to cope with heavy rain. During heavy rain, the barrier net 3 also effectively blocks leaves and twigs, preventing excessive accumulation of debris in the rectangular drain pipe 1 and ensuring effective drainage.

[0029] Specifically, the barrier net 3 includes a fixed net 302 and a movable net 301 that can slide up and down. A buoyancy block 303 is fixedly installed at the bottom of the movable net 301. When the rainwater reaches a certain height, the buoyancy block 303 generates buoyancy and moves upward together with the movable net 301, causing the mesh of the movable net 301 and the fixed net 302 to overlap, thus expanding the flow area between the rectangular drainage pipe 1 and the pre-drainage component 2. When the rainwater level is below a certain height, the movable net 301 is in a low position, and the mesh of the movable net 301 and the fixed net 302 are interwoven, preventing mud and sand from entering the rectangular drainage pipe 1.

[0030] The barrier net 3 consists of a double-layer screen composed of a movable net 301 and a fixed net 302. Together, they block large debris such as leaves and twigs that may flow from the pre-drainage component 2 to the rectangular drain pipe 1. When rainfall is low, the movable net 301 and fixed net 302 are interleaved, and the small gaps between them allow larger stones and gravel to get stuck between them. Some mud and sand may also adhere to the small gaps between the movable net 301 and fixed net 302. However, if rainfall increases, the rainwater... As the water flow velocity increases, the scouring capacity also improves. Therefore, it is necessary to enlarge the interlaced openings between the movable net 301 and the fixed net 302 to allow water to pass through them and wash away the silt. When the water level in the pre-drainage component 2 is high, i.e., when the rainwater volume increases and the water volume and flow velocity outside the rectangular drainage pipe 1 and the pre-drainage component 2 increase, the buoyancy block 303... The water will float upwards due to buoyancy, causing the pores of the movable net 301 and the fixed net 302 to overlap. This increases the clearance between the pre-drainage component 2 and the rectangular drainage pipe 1, reducing the need for increased water flow and velocity. After the pores of the movable net 301 and the fixed net 302 overlap, the sand and gravel inside will be washed away. Correspondingly, due to the increased pore size, the flow velocity of the water flowing from the pre-drainage component 2 into the rectangular drainage pipe 1 will also increase. Due to the high water level, the water will pass through the movable net 301 and the fixed net 302, quickly washing away some of the silt and preventing excessive silt from adhering to the movable net 301 and the fixed net 302. With a high flow velocity, the silt can be quickly washed away in the rectangular drainage pipe 1. In conjunction with the rainfall, the rectangular drainage pipe 1 can help the pre-drainage component 2 drain water. In this case, increasing the pore size between the movable net 301 and the fixed net 302 ensures the flow velocity of the water, which also ensures that when silt enters the rectangular drainage pipe 1, it can be quickly washed away.

[0031] When the movable net 301 is in a low position, it intersects with the fixed net 302, and the gaps between the movable net 301 and the fixed net 302 are also intersect, thus forming small gaps. When water flows into the pre-drainage component 2, the water splashed up and the mud, sand and gravel splashed out are not easy to enter the rectangular drainage pipe 1 through the movable net 301 and the fixed net 302, thus having a good blocking effect.

[0032] Specifically, the pre-drainage assembly 2 includes a second rain grate 202, on which a longitudinal drainage groove 204 is provided, and a reinforcing column is installed laterally in the middle of the drainage groove 204.

[0033] Specifically, the rectangular drain pipe 1 includes a drain frame 101 and a rain grate 102 at the top of the drain frame 101, and the two sides of the drain frame 101 are connected to the front drain assembly 2.

[0034] The drainage channels 204 are horizontally distributed, with a reinforcing column in the middle to prevent deformation of the second rain grate 202. The upper groove of the first rain grate 102 is aligned with the drainage channels 204. When rainwater drains, the longest section of the drainage channel 204 flows into the front drainage component 2 along the side of the second rain grate 202. Therefore, the water flowing in this section can carry more leaves, twigs, and other debris. The horizontal drainage channels 204 cater to the widest part of the water flow, collecting more rainwater, i.e., collecting more leaves from the rainwater. The longitudinal drainage channels 204 and the slots on the rain grate 102 face the narrower section, so fewer leaves and dead branches fall from the slots on the rain grate 102 into the rectangular drain pipe 1. When the direction is the same as the drainage channels 204, leaves pass through multiple drainage channels 204, and a very small number of leaves and dead branches will naturally flow into the rectangular drain pipe 1, helping to reduce the number of leaves and dead branches in the rectangular drain pipe 1. In the case of low rainfall, there may not even be any leaves or dead branches flowing into the rectangular drain pipe 1.

[0035] The drainage frame 101 is placed below the road surface and is connected to the pre-drainage component 2. When the water flow in the pre-drainage component 2 is too large, it can also be drained through the rectangular drainage pipe 1. Conversely, the water flow from the pre-drainage component 2 into the rectangular drainage pipe 1 will be blocked by the barrier net 3. During the rainy season, leaves and other objects will block the drainage channel 204, causing water to flow from the rain grate 102 into the rectangular drainage pipe 1. The rectangular drainage pipe 1 and the pre-drainage component 2 can work together to carry out drainage.

[0036] Specifically, the pre-drainage component 2 also includes a drainage frame 201. The bottom plate of the drainage frame 201 is provided with multiple sand accumulation protrusions 203. The multiple sand accumulation protrusions 203 reduce the water flow velocity and retain silt.

[0037] The cross-section of the multiple sand-accumulating protrusions 203 is serrated, and their direction can be straight, as shown in the figure, or it can be arc-shaped, fish-scale-shaped, curved, etc. The purpose is to reduce the water flow velocity, so that the sediment gradually sinks and falls near the sand-accumulating protrusions 203 as it flows with the rainwater. Reducing the flow velocity and retaining sediment is mainly under the conditions of light or moderate rain, that is, when the rainfall is small and the flow velocity is low. When the rainfall is heavy and the flow velocity is high, the cross-sectional height of the sand-accumulating protrusions 203 is not high enough, the water flow velocity is reduced by a small amount, and there is no need to retain sediment. The high-speed water flow can carry the sediment away quickly, and it can also impact the sediment near the sand-accumulating protrusions 203.

[0038] Specifically, water baffles 103 are provided on both sides of the bottom plate of the drainage frame 101, the buoyancy block 303 is flush with the height of the water baffles 103, and a cover plate 4 is provided between the rectangular drainage pipe 1 and the front drainage component 2 to limit the floating height of the movable net 301. The baffle plate 103 is used to increase the water level height between the rectangular drain pipe 1 and the pre-drainage component 2. When the water level exceeds the baffle plate 103, the buoyancy block 303 is buoyed and floats up.

[0039] The baffle plate 103 is located between the first drainage frame 101 and the second drainage frame 201. When the water level exceeds the baffle plate 103, rainwater can pass over the baffle plate 103 and flow from the front drainage component 2 into the rectangular drainage pipe 1. At the same time, the water surface will submerge the buoyancy block 303. The buoyancy block 303 will rise due to buoyancy and will be restricted by the cover plate 4. The cover plate 4 is fixed to the side plate of the first drainage frame 101 or the top of the side plate of the second drainage frame 201 by bolts. When necessary, the cover plate 4 can be removed, the movable net 301 can be taken out for cleaning, and the rain grate 202 or the fixed net 302 can be removed from the rain grate 102.

[0040] Furthermore, symmetrically sliding limit pins 5 are installed on the cover plate 4, and symmetrically slotted slots 304 corresponding to the shape of the limit pins 5 are opened on the top of the movable net 301. The limit pins 5 can slide in the slots 304 to connect the cover plate 4 and the movable net 301. The bottom of the limiting pin 5 has a limiting block with an increased diameter, which can prevent the limiting pin 5 from sliding out of the slot 304, while the top is connected to a limiting block by a thin rod; Using a thin rod and a top limiting block, the top shape of the limiting pin 5 is made to resemble the top shape of a nail. The nail-pulling groove at the end of a claw hammer can be inserted into the top of the limiting pin 5, and the limiting pin 5 can be pulled out like a nail. When the limiting pin 5 slides to the top of the inner side of the slot 304, it is lifted together with the movable net 301, forcing the movable net 301 and the fixed net 302 to interlock, thereby breaking the adhesion of mud and silt between them. When there are many dead branches and leaves, and the movable net 301 cannot float smoothly, this method can also be used to force the movable net 301 to rise, making the connection between the rectangular drain pipe 1 and the front drain assembly 2 smoother. Correspondingly, under normal floating conditions, the slot 304 of the movable net 301 will also float up and down outside the limiting pin 5 without being restricted.

[0041] Furthermore, after removing the cover plate 4, the cover plate 4 can be used as a handle for the movable net 301. Lifting the cover plate 4 together with the movable net 301 makes it easy to remove the movable net 301 and clean it. During the upward movement of the cover plate 4, the limiting block at the bottom of the limiting pin 5 will be stuck on the top of the inner wall of the slot 304, moving the movable net 301 upward together.

[0042] Example 2, refer to Figure 8 and Figure 9Unlike the above embodiments, the drainage frame 201 has a slot in the middle of one side plate for inserting the movable net 301, and the fixed net 302 is located on the side plate of the drainage frame 201 and is in close contact with the movable net 301. The side plate of the drainage frame 201 with the movable net 301 is in close contact with the side of the drainage frame 101. In this embodiment, the rectangular drain pipe 1 serves as a roadside rainwater inlet, and the pre-drainage component 2 can serve as an expansion unit. Based on the original roadside rainwater inlet, the width of the roadside rainwater inlet is increased to accommodate one or two pre-drainage components 2. If the original roadside rainwater inlet is too close to the roadside, and the culvert is also too close to the roadside curb, only one pre-drainage component 2 can be placed. Similar to the above embodiment, in this case, only one side plate of the drainage frame 101 should be connected to the drainage frame 201, and the other side should be closed.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A roadside drainage device, comprising a rectangular drainage pipe (1), characterized in that, Also includes: The pre-drainage component (2) is located on one side of the rectangular drainage pipe (1) or on both sides of the rectangular drainage pipe (1), connected to the rectangular drainage pipe (1), and discharges rainwater before the rectangular drainage pipe (1), reducing the flow rate of rainwater and intercepting mud and sand. The barrier net (3) is placed between the rectangular drain pipe (1) and the pre-drainage assembly (2) to intercept debris such as leaves and dead branches.

2. The roadside drainage device according to claim 1, characterized in that, The barrier net (3) includes a fixed net (302) and a movable net (301) that can slide up and down. A buoyancy block (303) is fixedly installed at the bottom of the movable net (301). After the rainwater reaches a certain height, the buoyancy block (303) generates buoyancy and moves upward together with the movable net (301), so that the mesh of the movable net (301) and the fixed net (302) overlap, expanding the flow area between the rectangular drainage pipe (1) and the pre-drainage component (2); When the rainwater level is below a certain height, the movable net (301) is in a low position, and the mesh of the movable net (301) and the fixed net (302) are interwoven, preventing mud and sand from entering the rectangular drainage pipe (1).

3. A roadside drainage device according to claim 2, characterized in that, The pre-drainage assembly (2) includes a second rain grate (202), on which a longitudinal drainage groove (204) is provided, and a reinforcing column is installed laterally in the middle of the drainage groove (204).

4. A roadside drainage device according to claim 3, characterized in that, The rectangular drain pipe (1) includes a drain frame (101) and a rain grate (102) at the top of the drain frame (101). The two sides of the drain frame (101) are connected to the front drain assembly (2).

5. A roadside drainage device according to claim 4, characterized in that, The pre-drainage component (2) also includes a drainage frame (201), the bottom plate of which is provided with multiple sand accumulation protrusions (203). The multiple sand accumulation protrusions (203) reduce the water flow velocity and retain silt.

6. A roadside drainage device according to claim 4, characterized in that, Water baffles (103) are provided on both sides of the bottom plate of the drainage frame (101). The buoyancy block (303) is flush with the water baffle (103). A cover plate (4) is provided between the rectangular drainage pipe (1) and the front drainage component (2) to limit the floating height of the movable net (301). The baffle plate (103) is used to increase the water level height between the rectangular drain pipe (1) and the pre-drainage assembly (2). When the water level exceeds the baffle plate (103), the buoyancy block (303) is buoyed and floats up.

7. A roadside drainage device according to claim 6, characterized in that, The cover plate (4) is symmetrically and slidably installed with limiting pins (5). The top of the movable net (301) is symmetrically provided with slots (304) corresponding to the shape of the limiting pins (5). The limiting pins (5) can slide in the slots (304) to connect the cover plate (4) and the movable net (301).

8. A roadside drainage device according to claim 7, characterized in that, The drainage frame (101) has slots in the middle of its two side plates for inserting the movable net (301), and the fixed net (302) is located on the two side plates of the drainage frame (101) and is in close contact with the movable net (301). The second drainage frame (201) has only one side panel, and the side without the side panel is distributed on the side of the first drainage frame (101).

9. A roadside drainage device according to claim 7, characterized in that, The drainage frame 2 (201) has a slot in the middle of one side plate for inserting a movable net (301), and the fixed net (302) is located on the side plate of the drainage frame 2 (201) and is in close contact with the movable net (301). The side plate of the drainage frame 2 (201) with the movable net (301) is in close contact with the side of the drainage frame 1 (101).

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