Silica sand shallow regulation and storage pavement and ecological sponge city road paving system

Abstract

This application relates to the field of road pavement, providing a silica sand shallow-layer water-retaining pavement and an ecological sponge city road pavement system. The system includes a permeable layer, a water-retaining layer, and a base layer. The permeable layer is paved with facing bricks, and the water-retaining layer contains multiple water-retaining bricks arranged in a grid pattern. Gaps between the different water-retaining bricks form a first flow channel. Each water-retaining brick has a water-retaining chamber, through which rainwater enters the water-retaining chamber via infiltration or overflow outlets. Different water-retaining chambers are connected by pipes to form a second flow channel. This application achieves graded rainwater treatment through dual flow channels, automatically diverting initially polluted rainwater and storing and purifying later-stage rainwater, effectively solving the problems of poor water quality and easy clogging in water-retaining pavements, and improving the efficiency of rainwater resource utilization.

Description

Technical Field

[0001] This application relates to the field of road paving, and more particularly to a shallow silica sand storage pavement and an ecological sponge city road paving system. Background Technology

[0002] Currently, in order to make comprehensive use of rainwater resources and to regulate rainwater, some urban roads, parks, squares, factories and residential areas will set up water storage pavements to store rainwater. However, before it rains, the pavement usually has a lot of mud, dust and other pollutants that will pollute the rainwater. This part of the rainwater is easy to deteriorate and cannot be recycled if stored directly. In addition, a lot of mud or dust can also easily cause blockage of the water storage channel and affect the service life of the water storage pavement. Summary of the Invention

[0003] To address the problems of existing water-retaining pavements that easily accumulate heavily polluted rainwater and become clogged during the initial stages of rainfall, this application proposes a silica sand shallow-layer water-retaining pavement and an ecological sponge city road paving system to achieve the discharge of rainwater in the early stages and the storage and collection management of rainwater in the later stages.

[0004] To achieve the above objectives, this application adopts the following technical solution: A shallow silica sand pavement includes a permeable layer, a water storage layer, and a base course. The permeable layer, water storage layer, and base course are arranged sequentially from top to bottom. The permeable layer is provided with facing bricks, and the water storage layer is provided with multiple water storage bricks. There are certain gaps between different water storage bricks to form a first flow channel, allowing rainwater to flow along the first flow channel. The water storage bricks are provided with water storage chambers, and rainwater enters the water storage chambers through infiltration or overflow outlets. Different water storage chambers are connected by pipes, so that a second flow channel is formed between the water storage chambers.

[0005] The above solution achieves graded treatment of rainwater by constructing a dual flow channel: in the early stage of rainfall, when the water level is low, rainwater is quickly discharged into the municipal pipe network along the first flow channel, avoiding the entry of highly polluted initial rainwater into the storage chamber; as rainfall continues or the amount of rainfall increases, the water level rises, and the relatively clean later rainwater enters the storage chamber through infiltration or overflow outlets for storage and purification, thereby solving the problems of initial rainwater pollution and system blockage from the source.

[0006] As an alternative implementation, water-retaining bricks include permeable bricks and sealed bricks. The permeable bricks are made of silica sand, allowing rainwater and air to permeate from the outside to the inside of the water-retaining cavity. The sealed bricks are made of impermeable materials or have an impermeable coating or interlayer, allowing the water-retaining cavity of the sealed bricks to form a sealed space.

[0007] This alternative implementation constructs a micro-ecological environment where anaerobic and aerobic environments coexist by differentially configuring permeable bricks and sealed bricks within the water storage layer: the anoxic environment within the sealed bricks is suitable for the reproduction of anaerobic microorganisms, which can perform preliminary hydrolysis and acidification of recalcitrant organic matter in rainwater; the oxygen-rich environment within the permeable bricks is suitable for the growth of aerobic microorganisms, which can further oxidize and decompose pollutants. This spatial functional zoning achieves an efficient biological purification chain within a limited pavement structure thickness. Of course, the primary function of the silica sand shallow water storage pavement in this application is flood peak regulation, followed by water storage, and then water purification. Its water purification function is somewhat inferior to that of larger water purification devices, but it still has a certain effect. To improve the purification effect, water pumps and air pumps can be installed to control the water flow, but this is costly.

[0008] As an alternative implementation, a waterproof layer is provided inside or below the brick, and the waterproof layer covers the water storage cavity.

[0009] This optional implementation physically blocks the vertical infiltration path of rainwater using an impermeable layer, forcing rainwater to first enter the horizontal first flow channel. This structure further enhances the diversion effect of initial rainwater, preventing surface runoff carrying large particles of impurities from directly impacting the inside of the water storage chamber, effectively avoiding local deposition and blockage, and extending the maintenance-free cycle of the system.

[0010] As an optional implementation, an elastic sealing gasket is provided between the sealing brick and the facing brick, so that a closed water storage cavity is formed between the sealing brick and the facing brick.

[0011] This optional implementation gives the road surface a "breathing" function: when pedestrians or vehicles pass by, the load compresses the elastic sealing gasket, reducing the volume of the water storage chamber and generating positive pressure to expel the water inside; after the load is removed, the elastic sealing gasket rebounds to restore its volume, generating negative pressure to draw in external rainwater. This passive hydraulic circulation driven by traffic load not only promotes water renewal but also enhances anti-clogging capabilities.

[0012] As an optional implementation, the sealed brick is provided with a first water storage chamber and a second water storage chamber, which are separated by a permeable wall. The permeable brick is provided with a third water storage chamber and a fourth water storage chamber, which are directly connected at the bottom.

[0013] This alternative implementation optimizes the hydraulic process through a multi-chamber series design: the dual-chamber structure within the sealed brick extends the hydraulic residence time of the anaerobic reaction, and solid-liquid separation and slow-release of water are achieved through the permeable wall; the interconnected design at the bottom of the permeable brick ensures hydraulic balance and rapid flow in the aerobic zone. The combination of multi-chambers improves the overall storage capacity utilization and purification efficiency.

[0014] As an alternative implementation, the adjacent second and third water storage chambers are connected by an L-shaped pipe, and the adjacent first and fourth water storage chambers are connected by a straight pipe.

[0015] This alternative implementation utilizes the special geometry of the L-shaped pipe to achieve unidirectional flow guidance: when the liquid level in the third storage chamber is low, the pressure generated by squeezing the bricks can only push the water in the second storage chamber into the third storage chamber through the vertical part of the L-shaped pipe, while reverse flow is blocked. This non-powered one-way valve mechanism ensures that the water flow strictly follows the "anaerobic-aerobic" sequence for step-by-step purification, preventing short-circuiting and backflow.

[0016] In addition, this application also provides an ecological sponge city road paving system, including a silica sand shallow storage pavement as described above, and also includes rainwater wells and ecological tree pits. The rainwater wells are located on one side of the silica sand shallow storage pavement, and the ecological tree pits are located in the pavement and are isolated from the water storage layer using permeable bricks.

[0017] The above scheme integrates the shallow silica sand water storage pavement with storm drains and ecological tree pits to form a three-dimensional water storage network combining points, lines, and surfaces. Storm drains, as nodal storage units, receive road overflow, expanding the system's total storage capacity; ecological tree pits, using permeable bricks to prevent plant roots from damaging the water storage layer, simultaneously serve both landscaping and stormwater infiltration functions, enhancing the comprehensive service capacity of the road ecosystem.

[0018] As an alternative implementation, the rainwater well is equipped with an overflow pipe and a drain pipe, and the drain pipe is equipped with a drain valve, so that the rainwater in the rainwater well can be drained after the drain valve is opened.

[0019] This optional implementation gives the system proactive control capabilities: before a weather warning of heavy rainfall, the rainwater well capacity can be released in advance by opening the drain valve to maximize the use of the storage space to cope with the flood peak flow; the overflow pipe provides a safe flood discharge channel under extreme conditions to ensure the safe operation of the system.

[0020] As an optional implementation, a breathable barrier layer is provided below the rainwater well, allowing air to enter the rainwater well from below, but preventing rainwater from permeating downwards through the breathable barrier layer. The rainwater well is equipped with a level gauge probe and a suspended solids gauge probe.

[0021] This alternative implementation method utilizes a breathable barrier layer to maintain an aerobic environment within the well, enhancing the in-situ biological purification of stored rainwater. On the other hand, by monitoring the liquid level and suspended solids concentration in real time, it provides accurate data support for the system's intelligent operation and maintenance, dredging early warning, and water quality assessment, realizing the transformation from a passive facility to a smart infrastructure.

[0022] As an optional implementation, a buffer well is also provided, with the lower sidewall of the buffer well connected to the roof rainwater pipe and the upper sidewall of the buffer well connected to the silica sand shallow storage road surface.

[0023] This alternative implementation expands the system's catchment area, incorporating rooftop rainwater into the road's water storage system. The buffer well, acting as a connecting hub, not only dissipates the kinetic energy of falling rooftop rainwater but also directs it into the road surface's water storage layer for storage and utilization, achieving cross-interface water resource integration and incremental water storage in areas lacking independent water storage facilities.

[0024] Beneficial effects: The silica sand shallow-layer water storage pavement and ecological sponge city road paving system provided in this application solves the technical problems of poor water quality and easy clogging of traditional water storage pavements by constructing a graded distribution mechanism of the first and second flow channels. It automatically identifies and discards high-pollution rainwater in the early stages using water level thresholds, collecting only clean rainwater in the later stages. Simultaneously, through the spatial heterogeneous layout of permeable bricks and sealed bricks, an anaerobic-aerobic coupled biological purification system is constructed within a limited structural layer, significantly improving the in-situ purification efficiency of rainwater. Furthermore, the design of elastic sealing gaskets and multi-chamber unidirectional flow channels transforms external traffic loads into internal hydraulic circulation power, achieving energy-free water body renewal and anti-clogging maintenance. At the system level, by integrating rainwater wells, ecological tree pits, and buffer wells, and supplementing them with sensor monitoring and active drainage control, an ecological road infrastructure with elastic water storage, intelligent operation and maintenance, and multi-source water collection capabilities is formed, greatly improving the operational stability and resource utilization efficiency of sponge city facilities. Attached Figure Description

[0025] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0026] Figure 1 A top view schematic diagram of a portion of a shallow silica sand storage pavement according to an embodiment of this application is shown; Figure 2 It shows Figure 1 Schematic diagram of the cross section at point AA; Figure 3 A schematic diagram of a rainwater well for a shallow silica sand storage pavement according to an embodiment of this application is shown; Figure 4 It shows Figure 1 Schematic diagram of the cross section at point CC; Figure 5 It shows Figure 4 Enlarged view of a portion of point A in the middle; Figure 6 This illustration shows the installation status of water-retaining bricks and facing bricks in a shallow silica sand water storage pavement according to an embodiment of this application. Figure 7 A schematic diagram showing the separation state of water-retaining bricks and facing bricks in a shallow silica sand water storage pavement according to an embodiment of this application is shown.

[0027] Explanation of the labels in the diagram: 1-Permeable layer; 2-Water storage layer; 3-Base layer; 5-Facing brick; 6-Water storage brick; 7-Water storage chamber; 8-First flow channel; 9-Second flow channel; 10-Permeable brick; 11-Sealed brick; 12-Waterproof layer; 13-Elastic sealing gasket; 14-Suspended solids meter probe; 15-Rainwater well; 16-Overflow pipe; 17-Drain pipe; 18-Drain valve; 19-Permeable barrier layer; 20-Level gauge probe; 21-First water storage chamber; 22-Second water storage chamber; 23-Third water storage chamber; 24-Fourth water storage chamber; 25-Ecological tree pool; 26-Buffer well; 27-Rainwater pipe; 28-Pipeline; 29-L-shaped pipe; 30-Straight pipe; 31-Overflow well; 32-Overflow outlet; 33-Aeration outlet. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application 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 this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a shallow silica sand water storage pavement. The pavement structure, from top to bottom, includes a permeable layer 1, a water storage layer 2, and a base course 3. Specifically, the permeable layer 1, as the direct contact interface of the pavement, mainly undertakes load transfer, preliminary rainwater filtration, and surface water conduction functions. The water storage layer 2, located below the permeable layer, is the core storage and purification unit of the system, used to store clean rainwater and perform biological treatment. The base course 3 is located at the bottom and includes, from top to bottom, a geomembrane, a coarse sand leveling layer, a rigid permeable slab cushion layer, and a compacted soil layer, providing stable structural support and a leveling foundation for the entire pavement system. This layered design effectively decouples the load-bearing function of the pavement from its hydrological storage function in space, ensuring both road traffic safety and in-situ management of rainwater resources.

[0031] like Figure 4 and Figure 5As shown, the permeable layer 1 is provided with facing bricks 5, and the water storage layer 2 is arranged with multiple water-retaining bricks 6. The facing bricks 5 can be made of impermeable materials, but during laying, there are certain gaps or openings between the facing bricks 5 to allow rainwater to flow into the water storage layer 2 through the gaps or openings. In this embodiment, the facing bricks 5 are preferably made of high-strength permeable materials and are laid on top of the water-retaining bricks, which allows rainwater to infiltrate vertically and can withstand the load of pedestrians or vehicles. The water-retaining bricks 6 are arranged in an array within the water storage layer 2 to form a modular underground water storage space. It should be understood that although a regular rectangular arrangement is shown in the figure, in other embodiments, the water-retaining bricks can also be arranged in an interlocking, honeycomb, or other geometric topological manner, as long as a stable support structure is formed and the necessary water flow channels are reserved.

[0032] A certain gap exists between the different water-retaining bricks 6 to form a first flow channel 8, allowing rainwater to flow along it. This "certain gap" is functionally configured to form an open channel, not a microscopically closed pore seepage channel. Specifically, the width of this gap is sufficient to allow rainwater to pass quickly under gravity in the form of free surface flow, thereby significantly reducing flow resistance. In the initial stages of rainfall or during light rain, because the amount of rainwater entering the water-retaining layer 2 is small and the water level has not yet reached the inlet threshold of the water-retaining chamber 7, the rainwater will preferentially flow horizontally along this low-resistance first flow channel 8 and eventually flow into the municipal stormwater pipe network 27 or downstream discharge facilities. This automatic diversion mechanism based on hydraulic gradient essentially constitutes a physical initial rainwater diversion device, effectively preventing initial runoff carrying large amounts of silt, dust, and surface pollutants from entering the internal sophisticated water storage and purification system, thus reducing the risk of siltation and maintenance burden at the source.

[0033] like Figure 1 and Figure 2 As shown, the water-retaining brick 6 is provided with a water-retaining cavity 7, into which rainwater enters through a permeation or overflow port 32. When rainfall continues or intensifies, the water level in the first flow channel 8 gradually rises and exceeds a preset threshold. At this point, rainwater begins to permeate through the micropores on the surface of the water-retaining brick 6 or through the specially designed overflow port 32 into the internal water-retaining cavity 7. This water inflow process is significantly water level dependent; it is only triggered when the external water pressure is sufficient to overcome the resistance of the inlet or to reach the overflow elevation. This ensures that only the relatively clean rainwater that has undergone preliminary sedimentation is collected and stored. For example, the overflow port 32 can be located on the upper part of the side wall of the water-retaining brick 6, or the capillary permeability of the permeable brick 10 itself can be used as an inflow barrier. Both methods can achieve passive screening of the incoming water quality.

[0034] like Figure 4 and Figure 5As shown, the different water storage chambers 7 are connected by pipes 28, forming a second flow channel 9 between them. Specifically, adjacent or spaced-apart water storage chambers 7 are interconnected by pre-buried pipes 28 or built-in flow channels, constructing a distributed underground regulation and storage network. Unlike the rapid discharge function of the first flow channel 8, the second flow channel 9 is mainly used to extend the hydraulic residence time of rainwater in the system, promoting the sedimentation of suspended solids and the degradation and purification by microorganisms. At the same time, the connected chambers can also play a role in peak shaving and peak shifting, temporarily retaining a large amount of rainwater during heavy rain, reducing the instantaneous drainage pressure on the downstream pipe network. It should be understood that the connection method of the pipes 28 can be a rigid socket connection or a flexible sleeve connection, or even a water passage section can be directly formed through the butt joint structure of the water storage brick 6 body. This application does not limit this to a single method. The core is to establish a controllable hydraulic connection between the chambers, so that the dispersed water storage units work together to form an organic whole regulation and storage system. The second flow channel 9 and the first flow channel 8 can have the same or different water flow directions. The first flow channel 8 mainly relies on gravity to achieve flow, while the second flow channel 9 is set according to the location of water storage and use.

[0035] Example 2 like Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, the water-retaining brick 6 includes permeable bricks 10 and sealed bricks 11. Specifically, this heterogeneous material configuration aims to construct a micro-ecological environment for functional zones. The permeable brick 10 is made of silica sand, allowing rainwater and air to permeate from the outside to the inside of the water-retaining cavity 7. The silica sand material itself has a connected porous structure, which not only allows rainwater to slowly seep into the cavity under capillary action, but more importantly, ensures that atmospheric oxygen can continuously dissolve and be transported to the water body, thereby maintaining an oxygen-rich aerobic environment inside the permeable brick 10, suitable for the attachment and reproduction of aerobic microorganisms, for the efficient degradation of organic pollutants and ammonia nitrogen in the water. In contrast, the sealed brick 11 is made of an impermeable material, or has an impermeable coating or interlayer, so that the water-retaining cavity 7 of the sealed brick 11 can form a sealed space. For example, the sealed brick 11 can be made of silica sand concrete with an epoxy resin waterproof layer on the surface, the core of which is to completely block the gas exchange path. In this hypoxic or even anaerobic environment, obligate anaerobic bacteria can thrive and pre-treat recalcitrant macromolecular organic matter in rainwater through hydrolysis and acidification. By combining the permeable bricks 10 and the sealed bricks 11, this application achieves a biological treatment sequence of "anaerobic pre-treatment + aerobic deep purification" within a limited pavement structure thickness, significantly improving the in-situ purification efficiency of the system.

[0036] As an optional implementation, a waterproof layer 12 is provided inside or below the facing brick, covering the water storage chamber 7. The waterproof layer 12 can be a waterproof geomembrane, an asphalt waterproofing layer laid at the bottom of the facing brick, or a dense concrete layer integrated into the precast facing brick. This waterproof layer 12 completely blocks the top opening or permeable surface of the water storage brick 6 below, its core function being to physically block the vertical infiltration path of rainwater. When rainfall occurs, surface runoff is first intercepted by the waterproof layer 12, unable to directly enter the water storage chamber 7 below, but forced to change direction, flowing horizontally into the first flow channel 8 described in Embodiment 1. This structure effectively isolates the initial rainwater carrying large amounts of silt, dust, and surface pollutants from the internal sophisticated water storage and purification unit, preventing impurities from accumulating and causing blockages at the inlet of the water storage chamber 7. Only when the water level in the first flow channel 8 rises above the edge of the waterproof layer 12 or a specific overflow elevation can the relatively clean rainwater, after preliminary sedimentation, cross the barrier and enter the water storage chamber 7, thereby structurally ensuring the long-term stability and maintenance-free operation of the system.

[0037] As an optional implementation, an elastic sealing gasket 13 is provided between the sealed brick 11 and the facing brick, forming a closed water storage chamber 7 between the sealed brick 11 and the facing brick. The elastic sealing gasket 13 is preferably made of weather-resistant and resilient rubber or silicone material, and its shape is adapted to the contour of the top of the sealed brick 11, being tightly clamped between the top surface of the sealed brick 11 and the bottom surface of the facing brick. This structure not only enhances the water tightness and air tightness of the interface, but more importantly, it gives the pavement structure a "breathing" function, forming a passive hydraulic circulation mechanism. Specifically, when pedestrians or vehicles pass over the road and apply load, the paving bricks are compressed and sink, compressing the elastic sealing gasket 13 and causing it to deform elastically. This results in a momentary decrease in the volume of the water storage cavity 7 formed by the sealed brick 11 and the paving bricks, creating positive pressure within the cavity. This forces the stored rainwater out through the outlet or connecting pipe 28 and into the permeable brick 10 downstream. When the load is removed, the elastic sealing gasket 13 rebounds due to its elastic restoring force, pushing the paving bricks back to their original position. The volume of the water storage cavity 7 then increases, creating negative pressure within the cavity. Under the influence of atmospheric pressure difference, this draws in fresh rainwater from the outside or water from adjacent cavities to replenish the cavity. This periodic "squeezing-inhalation" action driven by traffic load essentially constitutes a non-powered micro-pump system. It not only promotes the renewal and replacement of water within the cavity, preventing water quality deterioration in stagnant areas, but also effectively prevents siltation and blockage of pores and pipes 28 through the flushing action of water flow, achieving self-sufficiency in operation and maintenance. In areas with few or irregular pedestrian traffic, air pumps or water pumps can be installed to generate negative or positive pressure to drive rainwater flow. Additionally, aeration ports can be installed on the sidewalls of the permeable bricks 10 to increase air circulation.

[0038] Example 3 like Figure 5 , Figure 6 and Figure 7As shown, in this embodiment, the internal microstructure of the water-retaining brick 6 has been further optimized to construct a precise and controllable hydraulic flow. Specifically, the sealed brick 11 is provided with a first water-retaining chamber 21 and a second water-retaining chamber 22, which are isolated from each other by a permeable wall. This dual-chamber series topology is not a simple spatial division, but rather an adaptation to the special requirements of the anaerobic treatment process for hydraulic residence time. The first water-retaining chamber 21 serves as the primary anaerobic reaction zone, receiving influent from the road surface or upstream, and utilizing the relatively static environment to promote the hydrolysis and acidification of macromolecular organic matter; the second water-retaining chamber 22 serves as a secondary anaerobic zone or a transition buffer zone. The permeable wall connecting the two not only serves as a physical separator, but its own microporous structure also acts as a biofilm carrier and a hydraulic damper. When water flows through the permeable wall, it can achieve a certain filtration effect, while the anaerobic bacteria attached to the wall surface can perform secondary degradation of the flowing water. It should be understood that the material of the permeable wall can be sintered silica sand, porous ceramics or perforated plates, as long as it is permeable and can maintain the independent biochemical environment of the two cavities.

[0039] Meanwhile, the permeable brick 10 is equipped with a third water storage chamber 23 and a fourth water storage chamber 24, which are directly connected at the bottom. Unlike the series connection mode in the sealed brick 11, the two chambers in the permeable brick 10 are connected at the bottom, essentially forming a U-shaped communicating vessel structure. This design ensures automatic water level balance inside the permeable brick 10, preventing overflow on one side due to local blockage. Furthermore, the bottom connection increases the contact area between the water and the bottom of the brick, and combined with the air permeability of the sidewalls of the permeable brick 10, enhances the mass transfer efficiency of oxygen to deeper water, providing a more uniform living space for aerobic microorganisms. In addition, the bottom connection can also serve as a sedimentation channel, allowing heavy particles to settle naturally under gravity and concentrate in the low-lying area at the bottom, facilitating subsequent backwashing or maintenance for centralized removal, rather than accumulating in individual chambers.

[0040] As an optional implementation, the adjacent second water storage chamber 22 and the third water storage chamber 23 are connected by an L-shaped pipe 29, and the adjacent first water storage chamber 21 and the fourth water storage chamber 24 are connected by a straight pipe 30. This connection structure is a key fluid control element for achieving the directional purification sequence in this application. The L-shaped pipe 29 includes a horizontal section and a vertical section, wherein one end of the horizontal section is connected to the second water storage chamber 22 of the sealed brick 11, and the other end extends into the third water storage chamber 23 of the permeable brick 10 and bends downward to form a vertical section, and the port of the vertical section is suspended in the lower middle space of the third water storage chamber 23. This geometric shape endows pipe 28 with unidirectional flow characteristics: when the system is static or the liquid level in the third water storage chamber 23 is lower than the vertical port, there is an air barrier or liquid seal barrier inside pipe 28; at this time, if the road surface bears a load causing positive pressure to be generated in the sealed brick 11 as described in Example 2, the pressure can only push the water in the second water storage chamber 22 through the horizontal part into the vertical part and inject it into the third water storage chamber 23; conversely, even if the liquid level in the third water storage chamber 23 rises or reverse pressure fluctuations occur, due to the orientation of the vertical port and the air resistance effect, the water cannot flow back to the second water storage chamber 22. In contrast, the straight pipe 30 connecting the first water storage chamber 21 and the fourth water storage chamber 24 allows bidirectional free flow, mainly used to balance the overall water level of the system and provide an emergency overflow channel. Through the combination configuration of the L-shaped pipe 29 and the straight pipe, the process flow of "anaerobic pretreatment of the sealed brick 11 → aerobic deep purification of the permeable brick 10" is forcibly locked, ensuring the stability of the water flow. The first water storage chamber 21, the second water storage chamber 22, the third water storage chamber 23, and the fourth water storage chamber 24 can be continuously circulated and repeatedly carried out aerobic and anaerobic biological treatment, achieving a good purification effect in a relatively small space.

[0041] Example 4 like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides an ecological sponge city road paving system, which integrates and expands upon the silica sand shallow water storage pavement described in embodiments 1 to 3. Specifically, this ecological sponge city road paving system not only includes the silica sand shallow water storage pavement as the main linear water storage component, but also includes rainwater wells 15 and ecological tree pits 25. This combined design integrates the originally scattered road drainage facilities, greening facilities, and water storage and purification facilities into an organic whole, forming a three-dimensional water storage network that works collaboratively in a "line-point-surface" manner, significantly improving the comprehensive rainwater management capabilities and ecological service value of road infrastructure.

[0042] In terms of spatial layout, rainwater wells 15 are located on one side of the shallow silica sand water storage pavement, while ecological tree pits 25 are located in the middle of the pavement. Specifically, the shallow silica sand water storage pavement extends longitudinally along the road, forming a continuous rainwater collection and purification corridor; rainwater wells 15 are spaced apart on the outer side of the curb or the edge of the green belt, serving as lateral storage hubs and overflow discharge nodes of the system; ecological tree pits 25 are embedded in the pavement area, satisfying the planting needs of roadside trees and participating in the system's hydrological cycle as distributed infiltration units. It should be understood that although... Figure 2 The illustration shows a typical layout where the rainwater well 15 is located on one side of the road and the tree pits are evenly distributed. However, in other embodiments, the rainwater well 15 can also be set on both sides of the road or at low-lying water collection points according to the terrain slope. The location of the ecological tree pits 25 can also be flexibly adjusted according to the landscape design and underground pipeline conditions, as long as effective hydraulic connection between the components is maintained.

[0043] The permeable brick 10 serves a dual function: firstly, its dense aggregate structure and mechanical strength effectively prevent plant roots from penetrating and growing, thus preventing them from damaging the water storage chamber 7 or clogging the internal channels. It also prevents the planting soil in the tree pit from being washed into the water storage layer 2 by rainwater, causing siltation. Secondly, the permeable brick 10's inherent water and air permeability ensures hydraulic connectivity and gas exchange between the tree pit and the lower water storage layer 2. This allows excess rainwater in the tree pit to smoothly infiltrate into the water storage layer 2 for storage and purification, while the moisture in the water storage layer 2 replenishes the tree roots, maintaining the micro-ecological environment necessary for tree growth. In contrast, using completely impermeable concrete or plastic partitions for isolation, while blocking roots, would sever the water-soil connection, leading to waterlogging, root rot, or loss of the seepage retention function in the tree pit. Without isolation, the system's lifespan would be significantly shortened. Therefore, using the permeable brick 10 as the isolation medium is the optimal solution for achieving a balance between engineering durability and ecological functionality. In addition, the isolation structure can be supplemented with geotextile wrapping or graded crushed stone transition layer to further enhance the blocking and water diversion effect; this application does not limit it to a single method.

[0044] The storm drain 15, serving as the system's storage hub, is connected to the shallow silica sand storage pavement via a pre-designed inlet or overflow channel to receive overflowing or actively introduced rainwater. When rainfall intensity exceeds the pavement's immediate infiltration and storage capacity, excess rainwater flows into the storm drain 15 for temporary storage, thereby expanding the system's total storage capacity and preventing road surface flooding due to excessive instantaneous flow. Simultaneously, the storm drain 15 provides a standardized interface for subsequent rainwater reuse or compliant discharge. In this embodiment, the storm drain 15 primarily establishes its skeletal position and connection relationships within the system; its internal active control components and monitoring equipment will be detailed in subsequent embodiments. Through the aforementioned system integration design, this application upgrades a single permeable pavement into a composite road infrastructure with elastic storage, ecological symbiosis, and long-term stable operation capabilities, effectively solving the technical challenges of functional fragmentation and maintenance difficulties inherent in traditional sponge city facilities.

[0045] Example 5 like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the rainwater well 15 in Embodiment 4 has undergone functional enhancement design, endowing the system with active regulation, in-situ purification, and intelligent sensing capabilities. As an optional implementation, the rainwater well 15 is equipped with an overflow pipe 16 and a drain pipe 17. The drain pipe 17 is equipped with a drain valve 18, allowing rainwater in the rainwater well 15 to be drained after the drain valve 18 is opened. Specifically, the overflow pipe 16 is typically located in the upper or top area of ​​the side wall of the rainwater well 15, serving as a safe flood discharge channel under extreme rainfall conditions. When the water level in the well exceeds the designed storage limit, excess rainwater is automatically discharged into the municipal pipe network or downstream water bodies through the overflow pipe 16 to prevent road flooding. The drain pipe 17 is preferably located at the bottom or lower side wall of the rainwater well 15 to completely drain the water accumulated in the well. The drain valve 18 is installed in the drain pipe 17 and can be an electric butterfly valve, a solenoid valve, or a manual gate valve; this application does not limit this to a single type. The core value of this structure lies in its proactive management of storage capacity: after a rainstorm warning is issued by the meteorological department but before the actual rainfall occurs, maintenance personnel can remotely control or operate on-site to open the drain valve 18, discharging the old water stored in the rainwater well 15 in advance, thereby freeing up the maximum effective storage capacity to accommodate the upcoming flood peak runoff. This "advance storage" mechanism significantly improves the system's resilience in responding to sudden heavy rainfall, avoids the problem of storage failure due to pre-existing water storage, and also facilitates routine maintenance and dredging operations. An overflow well 31 can be installed on one side of the road surface. When a severe rainstorm cannot penetrate the water storage layer 2 in a short time, rainwater can directly enter the overflow well 31, which is connected to the rainwater well 15 via a rainwater pipe 27.

[0046] As an optional implementation, a breathable barrier layer 19 is provided below the rainwater well 15, allowing air to enter the rainwater well 15 from below, but preventing rainwater from permeating downwards through the breathable barrier layer 19. The breathable barrier layer 19 can be laid on the bottom plate of the rainwater well 15 or embedded in the lower area of ​​the well body sidewall, forming a selective permeability barrier. In terms of material selection, the breathable barrier layer 19 can be made of breathable but water-resistant materials, such as sintered silica sand bricks, porous ceramic plates, or composite substrates covered with hydrophobic and breathable membranes. Silica sand covered with a hydrophobic membrane can also be used to achieve the effect of being breathable but impermeable to water. Taking sintered silica sand as an example, it has micron-level interconnected pores. Utilizing the principle of balance between the surface hydrophobic tension of water and capillary force, when the water pressure is lower than the breakthrough pressure, liquid water is blocked at the top and cannot permeate downwards; while gas molecules, not bound by capillary force, can freely pass through the pores to achieve exchange. This structure physically cuts off the seepage path of rainwater into the deeper layers of the roadbed, protecting the stability of the road foundation, while ensuring that fresh air from outside can continuously replenish the internal space of the rainwater well 15. Sufficient oxygen supply maintains an aerobic environment in the water within the well, promoting the degradation and metabolism of organic pollutants in the stored rainwater by aerobic microorganisms, effectively inhibiting the odor and blackening caused by anaerobic fermentation, making the rainwater well 15 itself a self-cleaning bioreactor, rather than a simple water storage container.

[0047] Furthermore, the rainwater well 15 is equipped with a level gauge probe 20 and a suspended solids gauge probe 14. The level gauge probe 20 and the suspended solids gauge probe 14 constitute the sensory nerve endings of the system, providing real-time data support for intelligent operation and maintenance. The level gauge probe 20 preferably adopts a hydrostatic, ultrasonic, or radar level sensor, which is vertically installed at a specific height in the well for continuous monitoring of water level changes. Its output signal can be directly associated with the control unit of the drain valve 18: for example, when the water level is detected to reach a preset low threshold, the drain valve 18 is automatically closed to prevent the water pump from running dry or excessively draining water; when the water level rises abnormally rapidly and fails to meet the expected rainfall, an overflow alarm is triggered to indicate the risk of blockage in the pipe 28. The suspended solids gauge probe 14 is usually an optical scattering or transmission sensor, installed in the middle and lower part of the well where the water flow is relatively stable, for online characterization of water turbidity and sediment content. When the concentration of suspended solids accumulates to a set limit, the system can automatically generate a dredging and maintenance work order, prompting maintenance personnel to perform sludge suction on the rainwater well 15 to prevent long-term accumulation of sediment from reducing the effective volume or deteriorating the effluent quality. It should be understood that although this embodiment describes two sensing parameters—liquid level and suspended solids—in other embodiments, water quality probes such as pH, dissolved oxygen, and conductivity can be added as needed, or multiple sensors can be integrated into the same probe module. As long as digital mapping and feedback control of the operating status of the rainwater well 15 can be achieved, it falls within the scope of protection of this application. Through the coordinated configuration of the above-mentioned active regulation, ecological purification, and intelligent monitoring components, the rainwater well 15 is upgraded from a traditional passive drainage facility to a smart sponge node with adaptive adjustment capabilities, significantly improving the operational reliability and environmental benefits of the ecological sponge city road paving system.

[0048] The suspended solids meter probe 14, along with the level gauge probe 20, forms the sensory nerve endings of the system, providing real-time data support for intelligent operation and maintenance. The level gauge probe 20 preferably uses a hydrostatic, ultrasonic, or radar-type level sensor, vertically installed at a specific height within the well for continuous monitoring of water level changes. Its output signal can be directly linked to the control unit of the drain valve 18: for example, when the water level reaches a preset low threshold, the drain valve 18 is automatically closed to prevent the water pump from running dry or excessively draining water; when the water level rises abnormally rapidly and fails to meet rainfall expectations, an overflow alarm is triggered to indicate the risk of blockage in the pipe 28. The suspended solids meter probe 14 typically uses an optical scattering or transmission sensor, installed in the lower middle part of the well where water flow is relatively stable, for online characterization of water turbidity and sediment content. When the accumulated suspended solids concentration exceeds a set limit, the system can automatically generate a dredging and maintenance work order, prompting maintenance personnel to perform sludge suction operations on the rainwater well 15 to prevent long-term sediment accumulation from reducing the effective volume or deteriorating the effluent quality. It should be understood that although this embodiment describes two sensing parameters, liquid level and suspended matter, in other embodiments, water quality probes such as pH value, dissolved oxygen, and conductivity can be added as needed, or multiple sensors can be integrated into the same probe module. As long as digital mapping and feedback control of the operating status of the rainwater well 15 can be achieved, it falls within the protection scope of this application. Through the coordinated configuration of the above-mentioned active regulation, ecological purification, and intelligent monitoring components, the rainwater well 15 is upgraded from a traditional passive drainage facility to a smart sponge node with adaptive adjustment capabilities, significantly improving the operational reliability and environmental benefits of the ecological sponge city road paving system.

[0049] Example 6 like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the ecological sponge city road paving system also includes a buffer well 26. The lower sidewall of the buffer well 26 is connected to the roof rainwater pipe 27, and the upper sidewall of the buffer well 26 is connected to the silica sand shallow storage pavement. This structure physically couples the rainwater collection system of the building roof with the road paving storage system, enabling the silica sand shallow storage pavement to not only undertake the storage task of its own catchment area but also serve as a storage carrier for rainwater from surrounding buildings. This effectively solves the problem that some areas cannot independently set up water storage facilities due to limited underground space, and significantly improves the rainwater resource utilization rate per unit area.

[0050] Specifically, the buffer well 26 employs a staggered interface layout in the vertical space. The position where the roof rainwater pipe 27 connects to the lower side wall of the buffer well 26 is significantly lower than the position where the shallow silica sand storage pavement connects to the upper side wall of the buffer well 26. This elevation difference design constitutes a natural energy dissipation and flow stabilization chamber. When rainwater from the roof rushes in at high speed through the roof rainwater pipe 27 during heavy rain, the water flow first falls into the buffer zone at the bottom of the buffer well 26, where most of the kinetic energy is dissipated by the water cushion layer or bottom space reserved in the well, preventing the high-energy water flow from directly impacting the water storage layer 2 structure of the shallow silica sand storage pavement or stirring up the deposited bottom mud. At the same time, because the pavement interface is located at a higher position, only when the water level in the buffer well 26 rises to the elevation of this interface will the stabilized rainwater gently overflow into the shallow silica sand storage pavement for storage and purification. This passive connection mechanism based on liquid level control not only prevents water from the road surface from flowing back into the roof pipe 28, but also ensures that the water flowing into the water storage layer 2 is in a laminar or low-turbulent state, which is conducive to maintaining the stability of the internal microbial community and sedimentation efficiency.

[0051] As an optional implementation, to further enhance the energy dissipation effect, auxiliary energy dissipation components can be added inside the buffer well 26. For example, an inclined energy dissipation baffle or stepped drop platform can be installed below the inlet of the roof rainwater pipe 27, forcing the falling water to spread along the surface or fall in stages, transforming the concentrated jet into a dispersed surface flow, thereby significantly reducing the flow velocity and impact force. Alternatively, a porous grid or straightening mesh can be installed in the upper middle part of the buffer well 26, near the interface of the silica sand shallow storage road surface, to perform secondary distribution and filtration of the water flowing into the road surface, intercepting large particles such as leaves and plastic fragments that may be brought in with the roof runoff, reducing the risk of blockage of the subsequent water storage bricks 6. It should be understood that the specific shape of the buffer well 26 can be circular, rectangular, or polygonal, and the material can be silica sand permeable bricks, precast concrete, HDPE spiral wound pipes, or other brick masonry, as long as it has sufficient structural strength to withstand soil pressure and load, and can achieve the above-mentioned energy dissipation and flow guidance functions. This application does not impose a unique limitation on this.

[0052] Through the aforementioned cross-boundary access structure, the buffer well 26 essentially plays a dual role as an "energy adapter" and a "water mixer." It not only eliminates the differences in dynamic characteristics between rainwater from different sources, ensuring the safety and durability of the silica sand shallow-layer stormwater storage pavement, but also incorporates the previously dispersed building and road rainwater into a unified stormwater storage and management system. This allows for the flexible expansion of the service area of ​​sponge city facilities without increasing land occupation, making it particularly suitable for scenarios with limited land resources, such as the renovation of old residential areas and high-density built-up areas.

[0053] Example 7 like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, to more clearly illustrate the synergistic effectiveness of the technical solution of this application in practical applications, this embodiment provides a full-condition operation scenario verification. By simulating a complete rainfall event and external load action, it dynamically demonstrates the entire process operation mechanism of the aforementioned silica sand shallow water storage pavement and ecological sponge city road paving system, from rainwater response, graded treatment, self-maintenance to active regulation. This dynamic verification is not only a logical connection to the aforementioned static structure, but also a key basis for proving the practical effectiveness and inventiveness of the technical solution of this application.

[0054] In the initial light rain or drizzle conditions, rainwater first falls onto the surface bricks of the road. Due to the low rainfall intensity at this time, the amount of rainwater entering the water storage layer 2 is limited, and the water level in the first flow channel 8 has not yet reached the inlet threshold of the water storage chamber 7. The rainwater preferentially flows horizontally along this low-resistance first flow channel 8 and eventually flows into the municipal stormwater pipe network 27 or downstream discharge facilities. Simultaneously, the waterproof layer 12, located below or inside the surface bricks, plays a crucial physical barrier role, effectively blocking the path of rainwater vertically infiltrating into the lower water storage chamber 7, and forcibly guiding the initial runoff carrying large amounts of silt, dust, and surface pollutants to be discharged horizontally. This dual diversion mechanism based on hydraulic gradient and structural barrier ensures that highly polluted initial rainwater is accurately removed, avoiding its impact and accumulation on the internal sophisticated water storage and purification unit, thus guaranteeing the water quality safety and maintenance cycle of the system from the source.

[0055] As the duration or intensity of rainfall increases, the water level in the first flow channel 8 gradually rises and exceeds the preset inlet threshold. At this time, the relatively clean rainwater, after initial sedimentation, begins to permeate through the micropores on the surface of the permeable brick 10 or through the specially designed overflow port 32 into the internal water storage chamber 7, triggering the regulation and purification function of the second flow channel. In this stage, the biological purification sequence inside the system is automatically activated: rainwater first enters the first water storage chamber 21 and the second water storage chamber 22 inside the sealed brick 11, where anaerobic microorganisms perform hydrolysis and acidification pretreatment on the recalcitrant organic matter in an oxygen-deficient environment; subsequently, under pressure difference or interconnection, the water flows unidirectionally into the third water storage chamber 23 and the fourth water storage chamber 24 inside the permeable brick 10 through the L-shaped pipe 29. The unique geometry of the L-shaped pipe 29 plays an irreplaceable role in fluid control during this process. Its vertical end is suspended in the lower part of the third water storage chamber 23. When the liquid level in the third chamber is low, an air gap or liquid seal is formed within the pipe 28, allowing water to flow unidirectionally from the second chamber to the third chamber, completely blocking the possibility of backflow. The water entering the permeable brick 10 undergoes further oxidation and decomposition of pollutants by aerobic microorganisms in an oxygen-rich environment, ultimately achieving deep purification. This spatial hierarchy of "anaerobic pretreatment + aerobic deep purification," combined with the unidirectional locking mechanism of the L-shaped pipe 29, ensures a strictly orderly purification process, avoids water quality deterioration caused by short-circuiting or backflow, and significantly improves the in-situ purification efficiency of the system.

[0056] During or after rainfall, when pedestrians or vehicles cross the road, the external traffic load drives the system to generate passive hydraulic circulation, achieving a self-maintenance function. Specifically, the load acts on the facing bricks, causing them to sink and compressing the elastic sealing gasket 13 set between the sealed brick 11 and the facing bricks. This results in an instantaneous decrease in the volume of the sealed water storage chamber 7, creating positive pressure within the chamber. This forces the stored rainwater to be discharged through the outlet or connecting pipe 28, creating a high-speed scouring effect on the downstream permeable bricks 10 or flow channels, effectively stripping away biofilm or sediments attached to the pore walls. When the load is removed, the elastic sealing gasket 13 rebounds due to its own elastic restoring force, pushing the facing bricks back to their original position. The volume of the water storage chamber 7 then increases, creating negative pressure within the chamber. Under the influence of atmospheric pressure difference, it draws in fresh rainwater from the outside or water from adjacent chambers to replenish the chamber. This load-driven periodic "squeezing-suction" action essentially constitutes a non-powered micro-pump system. It not only promotes the renewal and replacement of water in the cavity and avoids the deterioration of water quality in stagnant areas, but also effectively prevents the siltation and blockage of pores and pipes 28 by utilizing the flushing effect of water flow. It achieves self-sufficiency in operation and maintenance functions and greatly reduces the cost of manual maintenance.

[0057] When the meteorological department issues a rainstorm warning, the system can switch to an active control mode to cope with the upcoming flood peak. Maintenance personnel or the intelligent control system can remotely open the drain valve 18 installed on the drain pipe 17 of the rainwater well 15, discharging the old water stored in the rainwater well 15 into the municipal pipe network or reuse facilities in advance, thereby freeing up the maximum effective storage capacity. This "advance storage" mechanism significantly improves the system's resilience to sudden heavy rainfall and avoids the problem of storage failure due to pre-storage water occupying space. Simultaneously, the breathable and impermeable layer 19 laid below the rainwater well 15 continues to perform its ecological function during water storage. Its "air-permeable but water-impermeable" characteristic ensures that fresh air can enter the well, maintaining an aerobic environment to promote in-situ biological purification of the stored rainwater and suppress black and odorous phenomena. Meanwhile, the level gauge probe 20 and the suspended solids gauge probe 14 monitor the state inside the well in real time, providing accurate data support for the opening and closing control of the drain valve 18 and for dredging and maintenance, realizing the transformation from a passive facility to a smart infrastructure.

[0058] The suspended matter meter probe 14 monitors the well status in real time, providing accurate data support for the opening and closing control of the drain valve 18 and for dredging and maintenance, realizing the transformation from a passive facility to a smart infrastructure.

[0059] Furthermore, in complex scenarios involving rainwater harvesting from building roofs, the buffer well 26 plays a crucial role as a cross-boundary access hub. Roof rainwater rushes at high speed into the lower sidewall of the buffer well 26 via the roof rainwater pipe 27, first dissipating most of its kinetic energy in the buffer zone at the bottom of the well. This prevents the high-energy water flow from directly impacting the water storage layer 2 structure of the shallow silica sand storage pavement or agitating the deposited sediment. Only when the water level in the buffer well 26 rises to the elevation of its upper sidewall interface will the stabilized rainwater gently overflow into the shallow silica sand storage pavement for storage and purification. This passive connection mechanism based on liquid level control prevents backflow of pavement water into the roof pipe 28 and ensures that the water entering the water storage layer 2 is in a laminar or low-turbulent state. This helps maintain the stability of the internal microbial community and sedimentation efficiency, achieving safe integration and incremental storage of building rainwater and road rainwater without additional land occupation.

[0060] In summary, through dynamic verification under the aforementioned full-condition operation scenarios, the silica sand shallow water storage pavement and ecological sponge city road paving system proposed in this application not only achieves functional zoning and modular assembly in its static structure, but also demonstrates multiple synergistic effects in dynamic operation, including graded diversion, directional purification, load self-maintenance, active reservoir emptying, and cross-boundary energy dissipation. These dynamic mechanisms are mutually coupled and supportive, jointly constituting a composite road infrastructure with elastic water storage, intelligent operation and maintenance, and long-term stable operation capabilities, fully demonstrating the feasibility, superiority, and ingenuity of the technical solution in practical engineering applications.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A shallow silica sand water storage pavement, characterized in that: It includes a permeable layer (1), a water storage layer (2), and a base layer (3). The permeable layer (1), the water storage layer (2), and the base layer (3) are arranged from top to bottom. The permeable layer (1) is provided with facing bricks (5). The water storage layer (2) is provided with multiple water storage bricks (6). There is a certain gap between different water storage bricks (6) to form a first flow channel (8), so that rainwater can flow along the first flow channel (8). The water storage bricks (6) are provided with water storage chambers (7). Rainwater enters the water storage chambers (7) through infiltration or overflow outlets (32). Different water storage chambers (7) are connected by pipes, so that a second flow channel (9) is formed between the water storage chambers (7).

2. The silica sand shallow water storage pavement according to claim 1, characterized in that: The water-storing brick (6) includes a permeable brick (10) and a sealed brick (11). The permeable brick (10) is made of silica sand, so that the water-storing cavity (7) of the permeable brick (10) can permeate rainwater and air from the outside to the inside. The sealed brick (11) is made of an airtight material, or is provided with an airtight coating or interlayer, so that the water-storing cavity (7) of the sealed brick (11) can form a sealed space.

3. The silica sand shallow water storage pavement according to claim 2, characterized in that: A water-proof layer (12) is provided inside or below the brick (5), and the water-proof layer (12) covers the water storage cavity (7).

4. The shallow silica sand water storage pavement according to claim 3, characterized in that: An elastic sealing gasket (13) is provided between the sealing brick (11) and the facing brick (5), so that the sealing brick (11) and the facing brick (5) form a closed water storage cavity (7).

5. The shallow silica sand water storage pavement according to claim 4, characterized in that: The sealed brick (11) is provided with a first water storage chamber (21) and a second water storage chamber (22). The first water storage chamber (21) and the second water storage chamber (22) are separated by a permeable wall. The permeable brick (10) is provided with a third water storage chamber (23) and a fourth water storage chamber (24). The bottoms of the third water storage chamber (23) and the fourth water storage chamber (24) are directly connected.

6. The silica sand shallow water storage pavement according to claim 5, characterized in that: The adjacent second water storage chamber (22) and the third water storage chamber (23) are connected by an L-shaped pipe (29), and the adjacent first water storage chamber (21) and the fourth water storage chamber (24) are connected by a straight pipe (30).

7. An ecological sponge city road paving system, characterized in that: The shallow silica sand storage pavement according to any one of claims 1-6 further includes a rainwater well (15) and an ecological tree pit (25), wherein the rainwater well (15) is located on one side of the shallow silica sand storage pavement, and the ecological tree pit (25) is located in the pavement and is isolated from the water storage layer (2) by permeable bricks (22).

8. The ecological sponge city road paving system according to claim 7, characterized in that: The rainwater well (15) is equipped with an overflow pipe (16) and a drain pipe (17). The drain pipe (17) is equipped with a drain valve (18), so that the rainwater in the rainwater well (15) can be drained after the drain valve (18) is opened.

9. The ecological sponge city road paving system according to claim 7, characterized in that: The rainwater well (15) is provided with a breathable barrier layer (19) below it, so that air can enter the rainwater well (15) from below, but rainwater cannot permeate downward from the breathable barrier layer (19). The rainwater well (15) is provided with a level gauge probe (20) and a suspended matter gauge probe (14).

10. The ecological sponge city road paving system according to claim 7, characterized in that: A buffer well (26) is also provided. The lower side wall of the buffer well (26) is connected to the roof rainwater pipe (27), and the upper side wall of the buffer well (26) is connected to the silica sand shallow storage road surface.

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