An assembled three-face combined continuous rainwater inlet and a construction method thereof

Abstract

The application discloses an assembled three-side combined continuous rainwater inlet and a construction method thereof, and belongs to the technical field of rainwater inlets.The assembled three-side combined continuous rainwater inlet comprises a combined continuous rainwater inlet body, a flat grating of a driveway, a vertical grating of a curbstone, a flat grating of a sidewalk and a rainwater inlet connecting pipe, and the combined continuous rainwater inlet body comprises a standardized first prefabricated section and a plurality of groups of second prefabricated sections.The application innovatively constructs a three-in-one continuous water collecting system of the driveway, the curbstone and the sidewalk, expands the water collecting area and improves the instantaneous drainage flux;breaks through the inherent design idea of traditional rainwater inlets with single-side or double-side water inlet, realizes three-dimensional omnidirectional water collecting of a road, and solves the core technical problem of poor drainage and easy blockage of a low-lying road section from the structural system;lengths are flexibly adjusted by using modular prefabricated sections, the anti-blocking performance is improved, a standardized assembled construction process is matched, and the problem of flood drainage of a low-lying waterlogged road section or intersection of a city road is efficiently solved.

Description

Technical Field

[0001] This invention belongs to the field of rainwater inlet technology, specifically relating to a prefabricated three-sided combined continuous rainwater inlet and its construction method. Background Technology

[0002] Storm drains are openings on the sides of roads or in low-lying areas to drain rainwater. They typically lead directly to sewers and are covered with iron grates. They are key structures in drainage systems for collecting rainwater from the ground. There are four main types: flat grate, vertical grate, side ditch, and combined type. They are used to collect rainwater from road surfaces in ordinary road sections, but in low-lying areas prone to waterlogging, the storm drain system needs to be strengthened to quickly drain accumulated water, reduce traffic disruption, and enhance the public's sense of gain, security, and happiness.

[0003] For example, Chinese Patent No. CN218562534U, published on March 3, 2023, discloses an integrally combined anti-settlement ductile iron rain grate, comprising: an integrally combined anti-settlement ductile iron rain grate, including an anti-settlement ductile iron rain grate and a vertical grate; one side of the vertical grate is connected to one side of the anti-settlement ductile iron rain grate; the anti-settlement ductile iron rain grate is mounted on a mounting frame of a support, one side of the anti-settlement ductile iron rain grate is hinged to one side of the mounting frame, and the other side of the anti-settlement ductile iron rain grate is separately connected to the mounting frame; a support, including a mounting frame and a grate support frame; and a vertical grate mounting box, which is mounted on the grate support frame of the support, with one side of the vertical grate mounting box used for mounting the vertical grate. This utility model embodiment features convenient installation and strong water flow capacity.

[0004] While existing technologies include combined flat and vertical rain grate systems that offer advantages such as easy installation and strong water flow capacity, they also have the following drawbacks: 1. Flood control and drainage for low-lying waterlogged sections or intersections of urban roads are usually located in low-lying areas prone to waterlogging. During heavy rain, the water in these sections or intersections is difficult to drain quickly, leading to waterlogging. The depth of the water can easily exceed the height of the roadside curbs, making it impossible to drain the water quickly and effectively. 2. The lengths of low-lying, waterlogged road sections or intersections vary in different low-lying, flood-prone areas, making it difficult to flexibly set and adjust the length of the storm drain according to the length of the waterlogged road section; Therefore, there is an urgent need for a prefabricated three-sided continuous rainwater inlet and its construction method that can quickly and effectively drain waterlogged sections or intersections of urban roads in low-lying and flood-prone areas, and can flexibly set and adjust the length of the rainwater collection grate according to the length of the waterlogged section or intersection, so as to achieve the purpose of quickly draining floodwater. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated three-sided combined continuous rainwater inlet and its construction method, which is suitable for flood control and drainage in low-lying waterlogged sections or intersections of urban roads. Through modular design, rapid assembly and adjustment of the rainwater collection grate length, it can quickly and effectively drain waterlogged areas in low-lying areas prone to water accumulation and waterlogging, and waterlogged areas with a depth exceeding the height of the curb stones, thereby achieving the purpose of rapid drainage of waterlogged areas.

[0006] The technical solution of the present invention is as follows: A prefabricated three-sided combined continuous rainwater inlet is suitable for flood control and drainage in low-lying, waterlogged sections or intersections of urban roads. It includes a combined continuous rainwater inlet body, comprising a standardized first prefabricated segment and multiple sets of second prefabricated segments. The combined continuous rainwater inlet body is based on the first prefabricated segment, with several sets of second prefabricated segments spliced ​​at both ends of the first prefabricated segment. The number of spliced ​​second prefabricated segments can be flexibly adjusted according to the length of the waterlogged section or intersection. The top portion of the combined continuous rainwater inlet body... Instead of installing separate roadway grates, curb grates, and sidewalk grates, a three-sided combined storm drain system is constructed, integrating the roadway, curbs, and sidewalks to create a synchronized water collection system. The roadway grates, curb grates, and sidewalk grates are arranged sequentially from the roadway towards the sidewalk. Each roadway grates, curb grates, and sidewalk grates has an internally connected, integrated water collection chamber. The curb grates collect overflow water that has spilled over the curbs, while the roadway grates and sidewalk grates collect road surface runoff from the roadway and sidewalk, respectively.

[0007] Optionally, the splicing surfaces of the first and second precast segments are sealed with 1:3 cement mortar. The bottoms of the first and second precast segments are respectively connected to anti-settlement concrete cushion layers, which include C15 concrete cushion layers. The tops of the first and second precast segments are respectively fitted with precast lintels, which are fixed and installed with 10 mm thick 1:3 cement mortar. One side of the first precast segment is connected to the rainwater inlet connecting pipe.

[0008] Optionally, the driveway grate, curb grate, and sidewalk grate are all designed in a standardized modular manner. The driveway, curb, and sidewalk water inlet channels of the combined continuous rainwater inlet body are independent of each other and the cavities are connected. When a single grate is blocked, the other two sides can collect and drain water normally. The sidewalk grate is connected to the rainwater inlet connecting pipe on the outside.

[0009] Optionally, when the number of grates in the combined continuous rainwater inlet body is greater than 3, the length of the combined continuous rainwater inlet body can be flexibly set and adjusted to adapt to the length of low-lying waterlogged road sections or intersections in urban areas by increasing the number of second prefabricated segments and correspondingly increasing the number of lintels and rainwater grates.

[0010] Optionally, the driveway grate is made of cast iron, and the sidewalk grate is made of cast iron or composite material. The composite material grate has a strength grade of C250. After installation, the driveway grate and the sidewalk grate are leveled and smoothly connected to the driveway surface and the sidewalk surface, respectively.

[0011] Optionally, the rainwater inlet connecting pipe is a reinforced concrete Class II socket pipe, and the minimum design slope i and the inner diameter or nominal diameter D of the rainwater inlet connecting pipe are determined according to actual needs.

[0012] Optionally, when the road longitudinal slope is ≥3‰, the longitudinal slope j of the drainage ditch at the bottom of the second precast segment is the same as the road longitudinal slope; when the road longitudinal slope is <3‰, the longitudinal slope j of the drainage ditch is ≥3‰; the longitudinal slope j of the drainage ditch can be achieved by adjusting the slope of the top surface of the subbase.

[0013] A construction method for a prefabricated three-sided combined continuous rainwater inlet includes the following steps: S1 Trench Excavation: Excavation of a dedicated foundation pit for rainwater inlets using excavation equipment; S2 Trench Acceptance: Verify the dimensions and depth of the foundation pit, and install slope protection to prevent the foundation pit from collapsing; S3 Subbase Construction: Pour a C15 concrete subbase at the bottom of the foundation pit, compact it, and level it. S4 Embedded parts installation: hoist the first and second precast segments to the design position of the subbase, and adjust the longitudinal slope of the drainage ditch bottom to meet the standard; S5 Segment splicing and sealing: Align the elevations of the first and second precast segments, and use cement mortar to seal the splice joint; S6 Water outlet pipe installation: Connect the rainwater inlet connecting pipe at the water outlet hole reserved in the first prefabricated section; S7 Lintel Installation: Hoist the precast lintel to the reserved position on the main body of the combined continuous rainwater inlet, and fix it with 10 mm thick 1:3 cement mortar; S8 trench backfilling: The trench is backfilled simultaneously on both sides in layers by manual compaction to meet the roadbed load standards; S9 grate installation: Install the driveway grate, side stone grate, and sidewalk grate in sequence; S10 Leveling and smoothing: Level the carriageway and sidewalk grates with the corresponding road surfaces to ensure a smooth transition. S11 Finished Product Acceptance and Operation and Maintenance: Overall acceptance of elevation, pipe and component installation quality, and subsequent regular inspection and maintenance.

[0014] Optionally, in the S3 subbase construction step, the slope of the top surface of the subbase is adjusted synchronously during the subbase construction stage to control the longitudinal slope of the drainage ditch bottom.

[0015] The beneficial effects of this invention are: The prefabricated three-sided combined continuous rainwater inlet and its construction method disclosed in this application have the following advantages: 1. Significantly improved drainage performance: The three-dimensional water collection system, which includes the roadway, curbs, and sidewalks, has a water collection area and instantaneous drainage capacity that are far greater than traditional single-sided or double-sided storm drains. This system quickly eliminates water accumulation in low-lying areas and reduces the risk of urban flooding. 2. Strong anti-clogging ability: The three independent water inlet channels of the driveway, curb and sidewalk, the blockage of a single grate will not affect the overall drainage, and avoid the failure of drainage in heavy rain; 3. High modularity and adaptability: The second prefabricated segment can be freely added or removed, and the overall water collection length of the rainwater inlet can be flexibly adjusted according to the length of the waterlogged section; 4. Convenient construction and shortened construction period: Factory-prefabricated components are hoisted and assembled on site, eliminating a large amount of wet work. The construction process is standardized, which greatly shortens the on-site construction cycle. 5. Durable structure and low operation and maintenance cost: The integrated precast concrete structure has strong integrity, is not easy to settle and break, the rain grate is easy to disassemble and assemble, the later cleaning and maintenance is simple, and the long-term operation and maintenance cost is lower. This application innovatively constructs a three-dimensional continuous water collection system integrating the carriageway, curbs, and sidewalks, expanding the water collection area and increasing the instantaneous drainage capacity. It breaks through the traditional design concept of single or double-sided water inlet, realizing three-dimensional water collection without dead angles throughout the road area. It solves the core technical problem of incomplete drainage and easy blockage failure in low-lying road sections from the structural system perspective. It utilizes modular prefabricated segments to achieve flexible length adjustment, improves anti-blockage performance, and is equipped with a standardized prefabricated construction process to efficiently solve the flood control and drainage problems of low-lying waterlogged sections or intersections of urban roads, and improves the municipal road drainage terminal system. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Figure 1This is a top view of the structure of the present invention; Figure 2 This is a frontal cross-sectional view of the present invention. Figure 3 This is a side cross-sectional view of the present invention. The figure shows: 1. Combined continuous rainwater inlet body; 11. First precast segment; 12. Second precast segment; 13. Lintel; 2. Roadway grate; 3. Side stone grate; 4. Sidewalk grate; 5. Rainwater inlet connecting pipe. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0020] Example 1 On November 28, 2024, the Ministry of Housing and Urban-Rural Development issued the "Catalogue of Prohibited and Restricted Technologies for Housing Construction and Municipal Infrastructure Projects (Second Batch)," which clearly restricts the use of traditional brick-built rainwater inlets and prohibits their use on urban road motor vehicle lanes and non-motor vehicle lanes. Cast-in-place concrete rainwater inlets, prefabricated rainwater inlets, and other technologies must be used as alternatives.

[0021] Addressing the industry pain points of existing single- or double-sided inlet storm drains, such as insufficient drainage capacity, susceptibility to overall blockage, inability to collect water across the entire area, and limitations in bricklaying techniques, this embodiment provides a prefabricated three-sided combined continuous storm drain, suitable for flood control and drainage in low-lying, waterlogged sections or intersections of urban roads. It includes the combined continuous storm drain body 1, see [link / reference]. Figure 2 The combined continuous storm drain body 1 includes a standardized first prefabricated segment 11 and multiple sets of second prefabricated segments 12. The combined continuous storm drain body 1 is based on the first prefabricated segment 11, and several sets of second prefabricated segments 12 are spliced ​​at both ends of the first prefabricated segment 11. The combined continuous storm drain body 1 is composed of the first prefabricated segment 11 and several sets of second prefabricated segments 12. The number of spliced ​​second prefabricated segments 12 can be flexibly adjusted according to the length of the waterlogged road section or intersection, thereby flexibly adjusting the length of the combined continuous storm drain body 1 to adapt to the length of different waterlogged road sections or intersections and meet the needs of efficient water collection and drainage.

[0022] The splicing surfaces of the first precast segment 11 and the second precast segment 12 are sealed with 1:3 cement mortar. The bottoms of the first precast segment 11 and the second precast segment 12 are respectively connected to anti-settlement concrete cushion layers, which include C15 concrete cushion layers. The tops of the first precast segment 11 and the second precast segment 12 are respectively equipped with precast lintels 13, which are fixed and installed with 10 mm thick 1:3 cement mortar. One side of the first precast segment 11 is connected to a rainwater inlet connecting pipe 5.

[0023] It should be noted that the concrete grade of lintel 13 is C30, and the net protective layer thickness is 30 mm.

[0024] See Figure 1 The top of the combined continuous storm drain body 1 is respectively equipped with a driveway grate 2, a curb grate 3, and a sidewalk grate 4. This three-sided combined storm drain system, consisting of driveway grate 2, curb grate 3, and sidewalk grate 4, constructs a three-sided synchronous water collection system for the driveway, curbs, and sidewalks. This three-sided synchronous three-dimensional water collection system has a significantly higher water collection area and instantaneous drainage capacity than traditional single-sided or double-sided storm drains. It can quickly dissipate water accumulation in low-lying road sections and reduce the risk of urban flooding; the carriageway grate 2, the curb grate 3, and the sidewalk grate 4 are installed sequentially from the carriageway to the sidewalk; the carriageway grate 2, the curb grate 3, and the sidewalk grate 4 are connected internally to form an integrated water collection chamber; the curb grate 3 collects the overflow water that overflows the curb stones, and the carriageway grate 2 and the sidewalk grate 4 collect the runoff from the carriageway and the sidewalk, respectively.

[0025] It should be noted that during heavy rain or storms, rainwater on the road surface flows downwards from the roadway grate 2 into the integrated water collection chamber, while rainwater overflowing from the road edge flows laterally into the integrated water collection chamber through the curb grate 3. Water accumulation on the sidewalk is simultaneously collected into the integrated water collection chamber through the sidewalk grate 4. The water inlet channels of the roadway, curb, and sidewalk are independent of each other. If one grate is blocked by debris, the remaining two grate channels can still continue to receive water. Blockage of a single grate does not affect the overall drainage, thus preventing drainage failure during storms. After the rainwater from the roadway, curb, and sidewalk is collected, it is quickly diverted to the external municipal stormwater pipe network, eliminating water accumulation on low-lying road sections in a comprehensive and rapid manner.

[0026] Among them, the driveway grate 2, the curb grate 3, and the sidewalk grate 4 all adopt standardized modular design. The three water inlet channels of the combined continuous rainwater inlet body 1, namely the driveway, curb, and sidewalk, are independent and connected. When a single grate is blocked, the other two sides can collect and drain water normally. The sidewalk grate 4 is connected to the rainwater inlet connecting pipe 5 on the outside.

[0027] It should be noted that the integrated continuous water collection system of the roadway, curb, and sidewalk expands the water collection area and increases the instantaneous drainage capacity. It breaks through the traditional design concept of single or double-sided water inlet of rainwater inlets, realizes three-dimensional water collection without dead angles throughout the road area, and solves the core technical problem of water accumulation and easy blockage failure in low-lying road sections from the structural system.

[0028] Among them, the roadway grate 2 is made of cast iron, and the sidewalk grate 4 is made of cast iron or composite material. The strength grade of the composite material grate is C250. After installation, the roadway grate 2 and the sidewalk grate 4 are leveled and connected to the road surface and the sidewalk surface, respectively.

[0029] Among them, the rainwater inlet connecting pipe 5 adopts a reinforced concrete Class II socket pipe, and the minimum design slope i value and the inner diameter or nominal diameter D value of the rainwater inlet connecting pipe 5 are determined according to actual needs.

[0030] It should be noted that in the design and specifications of rainwater inlet projects, the "i value" usually refers to the minimum design slope of the rainwater inlet connecting pipe 5, which is specified to be no less than 1% (i.e., i ≥ 1%). The "D value" related to the rainwater inlet usually refers to the inner diameter or nominal diameter of the rainwater inlet connecting pipe 5. The D value of a single rainwater inlet connecting pipe should not be less than 200 mm. When two or more rainwater inlets are connected in series, the D value of the rainwater inlet connecting pipe 5 should be increased to 300 mm.

[0031] It should be noted that when the soil cover thickness of the rainwater inlet connecting pipe 5 is less than 0.7 m, full reinforcement should be adopted, and the specific implementation should be in accordance with the design requirements.

[0032] Example 2 This embodiment is based on Embodiment 1. Figure 2 In the case of a three-grid design, when the number of grates in the combined continuous rainwater inlet body 1 is greater than 3, the length of the combined continuous rainwater inlet body 1 can be flexibly set and adjusted to adapt to the length of low-lying waterlogged road sections or intersections in urban areas by increasing the number of the second prefabricated segment 12 and correspondingly increasing the number of lintels 13 and rainwater grates.

[0033] Specifically, when the road longitudinal slope is ≥3‰, the drainage ditch bottom longitudinal slope j at the bottom of the second precast segment 12 is the same as the road longitudinal slope; when the road longitudinal slope is <3‰, the drainage ditch bottom longitudinal slope j is ≥3‰; the drainage ditch bottom longitudinal slope j can be achieved by adjusting the slope of the top surface of the subbase.

[0034] It should be noted that the design of the drainage ditch bottom longitudinal slope j at the bottom of the second precast segment 12 allows rainwater at the bottom of the second precast segment 12 to be quickly guided along the drainage ditch bottom longitudinal slope j to the bottom of the first precast segment 11, and then quickly guided to the external municipal rainwater pipe network through the rainwater inlet connecting pipe 5, thus eliminating the water accumulation on the road surface in low-lying sections in an all-round and rapid manner.

[0035] Example 3 This embodiment provides a construction method for a prefabricated three-sided combined continuous rainwater inlet, including the following steps: S1 Trench Excavation: Excavation of a dedicated foundation pit for rainwater inlets using excavation equipment; S2 Trench Acceptance: Verify the dimensions and depth of the foundation pit, and install slope protection to prevent the foundation pit from collapsing; S3 Subbase Construction: Pour a C15 concrete subbase at the bottom of the foundation pit, compact it, and level it. S4 Embedded parts installation: hoist the first precast segment 11 and the second precast segment 12 to the design position of the subbase, and adjust the longitudinal slope of the drainage ditch to meet the standard; S5 Segment splicing and sealing: Align the elevations of the first precast segment 11 and the second precast segment 12, and seal the splicing joint with 1:3 cement mortar; S6 Water outlet pipe installation: Connect the rainwater inlet connecting pipe 5 at the water outlet hole reserved in the first prefabricated section 11; S7 Lintel Installation: Hoist the precast lintel 13 to the reserved position of the combined continuous rainwater inlet body 1, and fix it with 10 mm thick 1:3 cement mortar; S8 trench backfilling: The trench is backfilled simultaneously on both sides in layers by manual compaction to meet the roadbed load standards; S9 grate installation: Install the driveway grate 2, the curb grate 3, and the sidewalk grate 4 in sequence; S10 Leveling and smoothing: Level the carriageway leveling grate 2 and the sidewalk leveling grate 4 with the corresponding road surface to ensure a smooth transition of the road surface; S11 Finished Product Acceptance and Operation and Maintenance: Overall acceptance of elevation, pipe and component installation quality, and subsequent regular inspection and maintenance.

[0036] This construction method is convenient and shortens the construction period. It uses factory-prefabricated components for on-site hoisting and splicing, eliminating a large amount of wet work. The construction process is standardized, which greatly shortens the on-site construction cycle. In addition, the structure is durable and the operation and maintenance costs are low. The integrated prefabricated concrete structure has strong integrity and is not easy to settle or break. The rain grate is easy to disassemble and assemble, and the later cleaning and maintenance are simple, resulting in lower long-term operation and maintenance costs.

[0037] In the S3 subbase construction step, the slope of the top surface of the subbase is adjusted simultaneously during the subbase construction stage to control the longitudinal slope of the drainage ditch bottom.

[0038] This application innovatively constructs a three-dimensional continuous water collection system integrating the carriageway, curbs, and sidewalks, expanding the water collection area and increasing the instantaneous drainage capacity. It breaks through the traditional design concept of single or double-sided water inlet, realizing three-dimensional water collection without dead angles throughout the road area. It solves the core technical problem of incomplete drainage and easy blockage failure in low-lying road sections from the structural system perspective. It utilizes modular prefabricated segments to achieve flexible length adjustment, improves anti-blockage performance, and is equipped with a standardized prefabricated construction process to efficiently solve the flood control and drainage problems of low-lying waterlogged sections or intersections of urban roads, and improves the municipal road drainage terminal system.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prefabricated three-sided combined continuous rainwater inlet, comprising a combined continuous rainwater inlet body (1), characterized in that: The combined continuous storm drain body (1) includes a standardized first prefabricated segment (11) and multiple sets of second prefabricated segments (12). The combined continuous storm drain body (1) is based on the first prefabricated segment (11), and several sets of second prefabricated segments (12) are spliced ​​at both ends of the first prefabricated segment (11). The number of spliced ​​second prefabricated segments (12) is flexibly adjusted according to the length of the waterlogged road section or intersection. The top of the combined continuous storm drain body (1) is respectively equipped with a roadway grate (2), a side stone grate (3), and a sidewalk grate (4). The roadway grate (2), curb grate (3), and sidewalk grate (4) are three-sided combined rainwater inlets, constructing a three-sided synchronous water collection system for the roadway, curb, and sidewalk. The roadway grate (2), curb grate (3), and sidewalk grate (4) are arranged sequentially from the roadway to the sidewalk. The roadway grate (2), curb grate (3), and sidewalk grate (4) are internally connected to form an integrated water collection chamber. The curb grate (3) collects overflow water that has overflowed the curb, while the roadway grate (2) and sidewalk grate (4) collect road surface runoff from the roadway and sidewalk, respectively.

2. The prefabricated three-sided combined continuous rainwater inlet according to claim 1, characterized in that: The splicing surfaces of the first precast segment (11) and the second precast segment (12) are sealed with 1:3 cement mortar. The bottoms of the first precast segment (11) and the second precast segment (12) are respectively connected to anti-settlement concrete cushion layers, which include C15 concrete cushion layers. The tops of the first precast segment (11) and the second precast segment (12) are respectively equipped with precast lintels (13). The lintels (13) are fixed and installed with 10 mm thick 1:3 cement mortar. A rainwater inlet connecting pipe (5) is connected to one side of the first precast segment (11).

3. The prefabricated three-sided combined continuous rainwater inlet according to claim 2, characterized in that: The driveway grate (2), side stone grate (3) and sidewalk grate (4) are all designed in a standardized modular manner. The driveway, side stone and sidewalk water inlet channels of the combined continuous rainwater inlet body (1) are independent and the cavities are connected. When a single grate is blocked, the other two sides can collect water and drain normally. The sidewalk grate (4) is connected to the rainwater inlet connecting pipe (5) on the outside.

4. The prefabricated three-sided combined continuous rainwater inlet according to claim 1, characterized in that: When the number of grates in the combined continuous rainwater inlet body (1) is greater than 3, the length of the combined continuous rainwater inlet body (1) can be flexibly set and adjusted to adapt to the length of low-lying waterlogged road sections or intersections in urban areas by increasing the number of the second prefabricated segment (12) and correspondingly increasing the number of lintels (13) and rainwater grates.

5. The prefabricated three-sided combined continuous rainwater inlet according to claim 1, characterized in that: The roadway grate (2) is made of cast iron, and the sidewalk grate (4) is made of cast iron or composite material. The strength grade of the composite material grate is C250. After installation, the roadway grate (2) and the sidewalk grate (4) are leveled and connected to the road surface and the sidewalk surface, respectively.

6. The prefabricated three-sided combined continuous rainwater inlet according to claim 2, characterized in that: The rainwater inlet connecting pipe (5) adopts a reinforced concrete Class II socket pipe. The minimum design slope i value and the inner diameter or nominal diameter D value of the rainwater inlet connecting pipe (5) are determined according to actual needs.

7. The prefabricated three-sided combined continuous rainwater inlet according to claim 1, characterized in that: When the road longitudinal slope is ≥3‰, the drainage ditch bottom longitudinal slope j at the bottom of the second precast segment (12) is the same as the road longitudinal slope; when the road longitudinal slope is <3‰, the drainage ditch bottom longitudinal slope j is ≥3‰; the drainage ditch bottom longitudinal slope j can be achieved by adjusting the slope of the top surface of the cushion layer.

8. The construction method of the prefabricated three-sided combined continuous rainwater inlet according to any one of claims 1-7, characterized in that: Includes the following steps: S1 Trench Excavation: Excavation of a dedicated foundation pit for rainwater inlets using excavation equipment; S2 Trench Acceptance: Verify the dimensions and depth of the foundation pit, and install slope protection to prevent the foundation pit from collapsing; S3 Subbase Construction: Pour a C15 concrete subbase at the bottom of the foundation pit, compact it, and level it. S4 Embedded parts installation: hoist the first precast segment (11) and the second precast segment (12) to the design position of the subbase, and adjust the longitudinal slope of the drainage ditch to meet the standard; S5 Segment splicing and sealing: Align the elevations of the first precast segment (11) and the second precast segment (12), and seal the splice joint with 1:3 cement mortar; S6 Water outlet pipe installation: Connect the rainwater inlet connecting pipe (5) at the water outlet hole reserved in the first prefabricated section (11); S7 Lintel Installation: Hoist the precast lintel (13) to the reserved position of the combined continuous rainwater inlet body (1), and fix it with 10 mm thick 1:3 cement mortar; S8 trench backfilling: The trench is backfilled simultaneously on both sides in layers by manual compaction to meet the roadbed load standards; S9 grate installation: Install the driveway grate (2), side stone grate (3), and sidewalk grate (4) in sequence; S10 Leveling and smoothing: Level the carriageway leveling grate (2) and the sidewalk leveling grate (4) with the corresponding road surface to ensure a smooth transition of the road surface; S11 Finished Product Acceptance and Operation and Maintenance: Overall acceptance of elevation, pipe and component installation quality, and subsequent regular inspection and maintenance.

9. The construction method of the prefabricated three-sided combined continuous rainwater inlet according to claim 8, characterized in that: In the S3 subbase construction step, the slope of the top surface of the subbase is adjusted synchronously during the subbase construction stage to control the longitudinal slope of the drainage ditch bottom.

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