Drainage structure of sunken square

Abstract

The utility model discloses a kind of drainage structures of sunken square, including rainwater well (1), cable hand well mouth (2) and drainage channel (3), the drainage channel (3) is set to the both sides of the sunken square and linear extension, sunken square surface has the inclined surface (4) of the drainage channel (3) inclination to both sides, the cable hand well mouth (2) is set to the top of inclined surface (4), the rainwater well (1) is set to the drainage end of drainage channel (3) and communicates;Water drain hole (5) is equipped in the cable hand well mouth (2);Rainwater discharge pipe (6) of guiding river channel or drainage pipeline is equipped in the rainwater well (1);The utility model is guided rainwater well again after rainwater is dispersed and guided and part is discharged by cable hand well mouth and drainage channel cooperation slope face, effectively improve drainage efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the field of ground drainage systems, and in particular to a drainage structure for a sunken plaza. Background Technology

[0002] Urban drainage systems are a crucial component of urban infrastructure, primarily responsible for collecting, transporting, and discharging rainwater and sewage within cities. They play a vital role in preventing urban flooding, protecting the water environment, and ensuring the safe operation of cities. With the continuous development of social technology and aesthetics, sunken plazas with a greater sense of layering and enclosure are constantly emerging. A sunken plaza is a three-dimensional urban space created through vertical elevation differences. Its core characteristic is that it is lower than the surrounding ground level, either entirely or partially. Due to topographical constraints, sunken plazas are prone to water accumulation due to rainwater backflow. Existing sunken plazas use slopes to collect rainwater into storm drains for discharge. However, when rainfall is heavy, a large amount of rainwater will accumulate in the small and limited area of ​​the storm drains. The flow rate exceeds the maximum drainage capacity of the storm drains, creating a damming phenomenon. Furthermore, the debris and sediment carried by the rainwater will quickly clog the storm drains, leading to reduced drainage efficiency and gradually causing water accumulation, resulting in poor reliability. Utility Model Content

[0003] The purpose of this invention is to provide a drainage structure for sunken plazas. This invention utilizes cable manholes and drainage ditches in conjunction with a sloping surface to disperse and guide rainwater, partially draining it before directing it to rainwater wells, effectively improving drainage efficiency and reliability.

[0004] The technical solution of this utility model is as follows: A drainage structure for a sunken plaza includes rainwater wells, cable manholes, and drainage ditches. The drainage ditches are located on both sides of the sunken plaza and extend in a straight line. The surface of the sunken plaza has a sloping surface that slopes towards the drainage ditches on both sides. The cable manholes are located at the top of the sloping surface. The rainwater wells are located at the drainage ends of the drainage ditches and are connected to them. The cable manholes are provided with drainage holes. The rainwater wells are provided with rainwater discharge pipes that guide waterways or drainage pipelines.

[0005] In the drainage structure of the sunken plaza described above, the drainage ditch includes a drainage base set in the sunken plaza, the drainage base has a groove, the outer edge of the groove is provided with symmetrically arranged supporting angle steels, and the supporting angle steels are all provided with matching concrete cover plates.

[0006] In the aforementioned drainage structure of a sunken plaza, the inner wall of the ditch is provided with mortar bricks, and the surface of the mortar bricks has a waterproof mortar layer.

[0007] In the aforementioned drainage structure of a sunken plaza, the cable manhole includes a cable pit located within the sunken plaza, and the drainage hole is located at the bottom of the cable pit; the top opening edge of the cable pit is provided with a groove, and a matching manhole cover is provided in the groove.

[0008] In the aforementioned drainage structure of a sunken plaza, the inner wall of the cable pit has a waterproof mortar layer, and the bottom of the cable pit has a gravel layer that fills the drainage holes; a thick gravel layer is provided below the cable pit.

[0009] In the aforementioned drainage structure of a sunken plaza, the rainwater well includes a rainwater base located within the sunken plaza and connected to a drainage ditch. The side wall of the rainwater base is provided with a pipe opening, and the rainwater discharge pipe is located inside the pipe opening. The top of the rainwater base is provided with a grate, and a rainwater grate is provided on the grate.

[0010] In the aforementioned drainage structure of a sunken plaza, multiple flat stones are spliced ​​together around the top of the rainwater base, and the top surface of the flat stones has a guide slope that is inclined towards the rainwater grate; the top surface of the rainwater grate is lower than the bottom end of the guide slope.

[0011] In the aforementioned drainage structure of a sunken plaza, the slope of the sloping surface is 0.3%-0.5%.

[0012] Compared with existing technologies, this utility model is installed in a sunken plaza. When it rains, rainwater falls on the sunken slope and is evenly dispersed and guided towards the drainage ditch under the influence of gravity. During this process, rainwater mixed with a small amount of impurities will first flow through the cable manhole. After entering the cable manhole, some rainwater will be discharged through the drain hole, which meets the power laying needs of the sunken plaza and improves its functionality while providing initial drainage of rainwater. The rainwater will then flow to the linearly distributed drainage ditch, where it will be dispersed to avoid rainwater accumulating in one place and causing untimely drainage. After entering the straight drainage ditch, the flow velocity will decrease, allowing impurities and sediments to settle. The rainwater will then enter the rainwater well from the drainage end of the drainage ditch and be completely discharged through the rainwater discharge pipe, achieving sufficient drainage. This utility model effectively improves drainage efficiency and reliability by using the cable manhole and drainage ditch in conjunction with the slope to disperse and guide rainwater and partially discharge it before guiding it to the rainwater well. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of the drainage ditch of this utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the cable manhole of this utility model;

[0016] Figure 4 This is a cross-sectional structural diagram of the rainwater well of this utility model.

[0017] The markings in the attached diagram are as follows: 1. Rainwater well; 2. Cable manhole; 3. Drainage ditch; 4. Sloping surface; 5. Drain hole; 6. Rainwater discharge pipe; 7. Drainage base; 8. Trench; 9. Supporting angle steel; 10. Concrete cover plate; 11. Mortar brickwork; 13. Cable pit; 14. Embedded groove; 15. Manhole cover; 16. Crushed stone layer; 17. Thick crushed stone layer; 18. Rainwater base; 19. Pipe opening; 20. Grate seat; 21. Rainwater grate; 22. Flat stone; 23. Guide slope. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] Example: A drainage structure for a sunken plaza, as shown in the attached diagram. Figure 1 As shown, the sunken plaza includes rainwater wells 1, cable manholes 2, and drainage ditches 3. The drainage ditches 3 are located on both sides of the sunken plaza and extend in a straight line. The surface of the sunken plaza is cast with sloping surfaces 4 that slope towards the drainage ditches 3 on both sides. The cable manholes 2 are distributed at the top of the sloping surfaces 4. The rainwater wells 1 are located at the drainage ends of the drainage ditches 3 and are interconnected. Each cable manhole 2 has a drain hole 5. A rainwater discharge pipe 6, which guides a river or drainage pipeline, is fixed inside the rainwater well 1. (See attached diagram.) Figure 2 As shown, the drainage ditch 3 includes a concrete drainage base 7 installed in the sunken plaza. The drainage base 7 has a groove 8. Multiple sets of symmetrically arranged supporting angle steels 9 are fixed to the outer edge of the groove 8 by expansion bolts. A matching 300mm×400mm×50mm concrete cover plate 10 is fixed to each set of supporting angle steels 9. The surface of the cover plate is flush with the surrounding surface of the sunken plaza. The inner wall of the groove 8 is lined with mortar bricks 11, and the surface of the mortar bricks 11 is coated with a 20mm thick layer of waterproof mortar. (See attached...) Figure 3 As shown, the cable manhole 2 includes a cable pit 13 located within a sunken plaza. The drainage hole 5 is located on the C20 concrete at the bottom of the cable pit 13. A groove 14 is provided at the top edge of the opening of the cable pit 13, within which a manhole ring is fixed. A matching manhole cover 15 is fitted into the manhole ring, with the surface of the manhole cover flush with the slope surface. A waterproof mortar layer is provided on the inner wall of the cable pit 13. A 5cm layer of crushed stone 16, filling the drainage hole 5, is laid at the bottom of the cable pit 13. A 6cm thick layer of crushed stone 17 is laid below the cable pit 13, which, through high permeability, porous structure, and filtration characteristics, filters and buffers rainwater before guiding it to the surface. (See attached...) Figure 4As shown, the rainwater well 1 includes a rainwater base 18 located in the sunken plaza and connected to the drainage ditch 3. A pipe opening 19 is opened on the side wall of the rainwater base 18, and the rainwater discharge pipe 6 is installed inside the pipe opening 19 with the gap filled with mortar. A grate 20 is fixed to the top of the rainwater base 18 with mortar, and a rainwater grate 21 is embedded in the grate 20, allowing the rainwater well itself to directly drain water. Multiple interlocking flat stones 22 are fixed around the top of the rainwater base 18 with mortar. The top surface of the flat stones has a guide slope 23 that slopes towards the rainwater grate 21. The top surface of the rainwater grate 21 is 6 cm lower than the bottom of the guide slope 23, so rainwater is guided to the rainwater grate, improving drainage efficiency. The slope of the ramp 4 is 0.4%.

[0020] Working principle: When rainfall occurs, the slope 4 of the sunken plaza uses a gravity slope of 0.4% to evenly guide rainwater to the drainage ditches 3 on both sides. This slope design avoids rainwater retention and ensures the comfort of the plaza. When rainwater flows along the slope, it first flows through the cable manhole 2 set at the top of the slope. The drainage holes 5 in the cable manhole 2 and the bottom gravel layer 16 form a preliminary filtration system. The small amount of debris carried by the rainwater is intercepted by the gravel layer, and the water seeps into the ground through the drainage holes. The thick gravel layer 17 below the cable pit 13 uses high permeability to further buffer and filter debris, which not only meets the installation requirements of power facilities, but also completes the initial dispersion and discharge of rainwater through the pore conduction capacity of the gravel layer, reducing the subsequent drainage pressure. Rainwater continues to flow into the straight-lined drainage ditch 3. The ditch 8 within the drainage base 7 is constructed of mortar bricks 11, with a waterproof mortar layer covering the surface to ensure structural impermeability. The supporting angle steel 9 at the outer opening of the ditch and the concrete cover 10 form a load-bearing system. The gaps in the cover allow rainwater to flow into the ditch while bearing the load of the square. After entering the ditch, the flow velocity slows down due to the straight layout of the ditch, and larger debris and sediments naturally settle, reducing the risk of subsequent pipe blockage. The straight-lined ditch design expands the rainwater collection range and avoids the problem of concentrated flow in traditional single-point drainage. Rainwater that has undergone initial sedimentation in the drainage ditch flows into the rainwater well 1 at the drainage end. The rainwater base 18 is connected to the rainwater discharge pipe 6 through the pipe opening 19. The discharge pipe is directed to the municipal river or drainage pipeline. The grate 20 on the top of the rainwater well and the rainwater grate 21 form a secondary filtration structure. If the bottom of the guide slope 23 of the surrounding flat stones 22 is less than 6cm, the guide slope will accurately guide the rainwater to the grate. The guide slope formed by the splicing of flat stones and the slope form a continuous drainage path, ensuring that the rainwater flows into the rainwater well without dead corners. When the rainwater is discharged through the rainwater discharge pipe, the sealing treatment of the discharge pipe and the pipe opening prevents sewage backflow, and finally achieves efficient discharge of rainwater. By combining the functionality of cable manholes with the drainage system through diversion, primary filtration, channel sedimentation, and centralized discharge of rainwater, the drainage system effectively solves the problems of easy clogging and excessive flow in traditional sunken plaza single-point drainage by utilizing the dispersion and sedimentation characteristics of straight channels, thus significantly improving drainage efficiency and system reliability.

[0021] The above embodiments merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. Furthermore, in these embodiments, "up," "down," "left," "right," "front," and "back" represent relative positions only, not absolute positions. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A drainage structure for a sunken plaza, characterized in that: It includes a rainwater well (1), a cable manhole (2), and a drainage ditch (3). The drainage ditch (3) is located on both sides of the sunken plaza and extends in a straight line. The surface of the sunken plaza has a slope (4) that slopes towards the drainage ditches (3) on both sides. The cable manhole (2) is located at the top of the slope (4). The rainwater well (1) is located at the drainage end of the drainage ditch (3) and is connected to it. The cable manhole (2) is provided with a drain hole (5). The rainwater well (1) is provided with a rainwater discharge pipe (6) that guides the river or drainage pipeline.

2. The drainage structure of the sunken plaza according to claim 1, characterized in that: The drainage ditch (3) includes a drainage base (7) set in the sunken plaza. The drainage base (7) has a ditch (8). The outer edge of the ditch (8) is provided with symmetrically arranged supporting angle steels (9). The supporting angle steels (9) are all provided with matching concrete cover plates (10).

3. The drainage structure of the sunken plaza according to claim 2, characterized in that: The inner wall of the trench (8) is provided with mortar bricks (11), and the surface of the mortar bricks (11) has a waterproof mortar layer.

4. The drainage structure of the sunken plaza according to claim 1, characterized in that: The cable manhole (2) includes a cable pit (13) located in a sunken plaza, and the drainage hole (5) is located at the bottom of the cable pit (13). The top opening edge of the cable pit (13) is provided with a groove (14), and a matching manhole cover (15) is provided in the groove (14).

5. The drainage structure of the sunken plaza according to claim 4, characterized in that: The inner wall of the cable pit (13) has a waterproof mortar layer, and the bottom of the cable pit (13) has a gravel layer (16) that fills the drainage holes (5); a thick gravel layer (17) is provided below the cable pit (13).

6. The drainage structure of the sunken plaza according to claim 1, characterized in that: The rainwater well (1) includes a rainwater base (18) located in the sunken plaza and connected to the drainage ditch (3). The side wall of the rainwater base (18) is provided with a pipe opening (19), and the rainwater discharge pipe (6) is located in the pipe opening (19). The top of the rainwater base (18) is provided with a grate seat (20), and a rainwater grate (21) is provided on the grate seat (20).

7. The drainage structure of the sunken plaza according to claim 6, characterized in that: The top of the rainwater base (18) is surrounded by multiple flat stones (22) that are spliced ​​together. The top surface of the flat stones has a guide slope (23) that is inclined toward the rainwater grate (21). The top surface of the rainwater grate (21) is lower than the bottom of the guide slope (23).

8. The drainage structure of the sunken plaza according to claim 1, characterized in that: The slope of the slope (4) is 0.3%-0.5%.

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