Rapidly-assembled rainwater tank structure under urban road and construction method

Abstract

The invention discloses a rapid assembly type rainwater tank structure under an urban road and a construction method, and particularly relates to the technical field of municipal drainage engineering.The structure comprises prefabricated box units, and the prefabricated box units are connected through bell mouths and inserting openings in a bell-and-spigot joint mode to form a continuous box body channel; sealing assemblies such as water swelling strips and elastic sealants are arranged at the joints to ensure sealing performance, opposite-pull elements such as steel strands in reserved grooves are used for applying prestress to control gaps of the joints to be uniform, and the prefabricated box units are designed to be cuboid and connected with auxiliary structures such as inspection wells and sand setting wells. The construction method comprises the steps of construction preparation, trench excavation and support, foundation treatment, box body hoisting and connection, backfill compaction, pavement recovery and the like, and through standardized prefabrication and modular installation in combination with geological adaptability treatment and all-weather monitoring, the construction method has the advantages of being rapid in assembly, high in sealing performance, high in construction efficiency, low in cost, good in stability, safe, reliable and the like.

Description

Technical Field

[0001] This invention relates to the field of municipal drainage engineering technology, and more specifically, to the structure and construction method of a rapid-assembly rainwater tank under urban roads. Background Technology

[0002] With the acceleration of urbanization, the construction and renovation of urban road systems face enormous challenges. Currently, the drainage efficiency of urban road stormwater systems and the requirements for sponge city construction are constantly increasing. Research has revealed the following drawbacks of existing technologies: traditional rainwater tank construction uses on-site casting, resulting in long construction cycles, significant environmental impact, and low efficiency; existing prefabricated rainwater tank structures suffer from poor interface sealing and low installation efficiency, making it difficult to meet the demands of rapid construction; furthermore, current rainwater tank systems lack intelligent monitoring and control capabilities, making it impossible to monitor rainwater flow and water level in real time, and hindering the timely activation of emergency drainage mechanisms during heavy rain, which can easily lead to excessive road flooding.

[0003] Therefore, a rapid-assembly rainwater tank structure and construction method for urban roads are proposed to address the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a rapid assembly rainwater tank structure and construction method for urban roads, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rapid-assembly rainwater tank structure for urban roads, comprising prefabricated tank units, each prefabricated tank unit including a socket and a spigot. The socket and the spigot are connected to adjacent sets of prefabricated tank units via a socket-insertion method, thereby forming a continuous tank channel from several sets of prefabricated tank units. A sealing component is provided at the connection position of the socket and the spigot, the sealing component including a waterstop strip and elastic sealant. A reserved groove is provided on one side of the prefabricated tank unit, and a tension element is installed on one side of the reserved groove. The tensioning action of the tension element keeps the interface gap between the socket and the spigot uniform. The external shape of the prefabricated tank unit is configured as a cuboid. An auxiliary structure is also connected to the other side of the prefabricated tank unit, the auxiliary structure including an inspection well and a sedimentation well.

[0006] Preferably, the sealing assembly is disposed in the corresponding mounting grooves on the inner wall of the socket and the outer wall of the spigot, and the waterstop strip is made of a water-swellable material.

[0007] Preferably, the tensioning element is a steel strand, the reserved groove penetrates the wall thickness of the prefabricated box unit, and the reserved groove is configured to apply prestress to the interface gap between the socket and the spigot during tensioning.

[0008] Preferably, the exterior of the prefabricated box unit is coated with an anti-corrosion coating, which uses an epoxy-based material to resist water and soil corrosion.

[0009] Preferably, the manhole opening is equipped with a fall-prevention net, which is fixed to the manhole opening by anchors. An adjustable manhole cover is provided above the fall-prevention net, and the adjustable manhole cover is made of ductile iron.

[0010] The construction method for rapid prefabricated rainwater tank structures under urban roads includes the following steps: S1. Construction preparation: Conduct on-site surveys and measurements to determine the pipeline center and excavation boundary, and complete traffic diversion and fencing setup; S2. Trench excavation: Based on geological conditions and excavation depth, appropriate support structures are adopted. After excavation to the predetermined elevation, a protective layer is retained and manually trimmed. S3. Foundation Treatment: Inspect the bottom of the foundation pit, select the appropriate foundation treatment method based on the geological survey results, and conduct foundation bearing capacity testing; S4. Box installation: The prefabricated box unit is hoisted using lifting equipment, and adjacent prefabricated box units are connected through the socket and spigot. The sealing assembly is set at the interface and the pull element is used to control the interface gap. S5. Backfilling and compaction: After the prefabricated box unit is installed, backfilling is carried out in layers. The area around the prefabricated box unit is backfilled manually according to the backfill thickness predetermined, and the remaining parts are compacted mechanically. S6. Road surface restoration: After backfilling is completed, restoration work shall be carried out according to the original road surface structure.

[0011] Preferably, in step S2, the support structure is selected based on the excavation depth: Use retaining boards for support during shallow excavation; For medium depths, use channel steel support; Sheet piles are used for support at greater depths; Furthermore, horizontal and vertical supports are provided between the support structures.

[0012] Preferably, in step S4, the waterstop strip is installed on the inner working surface of the socket, lubricant is applied to the outer working surface of the spigot, and the precast box unit is accurately positioned and connected by the tensioning device through the tensioning element before inspection and acceptance.

[0013] Preferably, in step S5, the precast box unit is backfilled synchronously and symmetrically on both sides, and the thickness of each backfill layer is controlled within a predetermined range. When using mechanical compaction, a specific traveling speed and overlap width are adopted to ensure that the compaction degree meets the design requirements.

[0014] Preferably, the construction process also includes implementing all-weather monitoring, which includes monitoring of foundation pit deformation, groundwater level, and settlement of surrounding buildings. Based on the results of the foundation pit deformation monitoring, groundwater level monitoring, and settlement monitoring of surrounding buildings, the construction parameters are dynamically adjusted and corresponding reinforcement measures are taken.

[0015] The technical effects and advantages of this invention are as follows: 1. Compared with existing technologies, the rapid assembly rainwater tank structure and construction method for urban roads effectively solves the problem of poor sealing of traditional rainwater tank interfaces by adopting a precast concrete tank body and socket connection method, combined with the design of high elastic sealant and water-swellable waterstop strip, thereby improving the sealing performance and service life of the rainwater tank.

[0016] 2. Compared with existing technologies, the rapid assembly rainwater tank structure and construction method under urban roads overcomes the shortcomings of traditional rainwater tanks, such as long construction cycle, large environmental impact and low efficiency, by adopting standardized connection and rapid construction technology, thus shortening construction time and reducing construction costs and environmental burden.

[0017] 3. Compared with existing technologies, the rapid prefabrication rainwater tank structure and construction method under urban roads reduces the amount of on-site pouring and manual labor through prefabrication design and modular installation, thereby improving construction efficiency and reducing labor costs.

[0018] 4. Compared with existing technologies, the rapid prefabricated rainwater tank structure and construction method under urban roads adopts various foundation treatment methods based on different geological conditions, such as natural foundation, replacement with crushed stone and sand, or dumping boulders to squeeze out silt, to ensure the stability and safety of the rainwater tank structure and improve the overall load-bearing capacity of the structure.

[0019] 5. Compared with existing technologies, the adjustable anti-settlement and anti-theft manhole cover and anti-fall net design of the rapid assembly rainwater tank structure and construction method under urban roads effectively prevents the manhole cover from moving or falling accidentally, thus improving safety and reliability. Attached Figure Description

[0020] Figure 1 This is a flowchart of the method of the present invention.

[0021] Figure 2 This is a schematic diagram of the interface implementation of the present invention.

[0022] Figure 3 This is a schematic diagram of the pipeline foundation of the present invention.

[0023] Figure 4 This is a schematic diagram of the assembly of the anti-fall net for inspection wells according to the present invention.

[0024] Figure 5 This is a detailed drawing of the sedimentation well of the present invention.

[0025] Reference numerals: 1. Precast box unit; 2. Socket; 3. Insert; 4. Sealing assembly; 5. Ancillary structures; 11. Reserved groove; 12. Tie element; 41. Waterstop strip; 42. Elastic sealant; 51. Inspection well; 52. Sedimentation well. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1 As attached Figures 1 to 5 The rapidly assembled rainwater tank structure for urban roads shown includes a prefabricated tank unit 1. The prefabricated tank unit 1 includes a socket 2 and a spigot 3. The socket 2 and spigot 3 connect two adjacent sets of prefabricated tank units 1 via a socket-slot connection, thereby forming a continuous tank channel from several sets of prefabricated tank units 1. A sealing component 4 is provided at the connection point between the socket 2 and the spigot 3. The sealing component 4 includes a waterstop strip 41 and an elastic sealant 42. A reserved groove 11 is provided on one side of the prefabricated tank unit 1, and a tension element 12 is installed on one side of the reserved groove 11. The tensioning action of the tension element 12 maintains a uniform gap between the socket 2 and the spigot 3. The external shape of the prefabricated tank unit 1 is configured as a cuboid. An auxiliary structure 5 is also connected to the other side of the prefabricated tank unit 1. The auxiliary structure 5 includes an inspection well 51 and a sedimentation well 52.

[0028] Specifically, the prefabricated box unit 1 adopts a standardized cuboid design for easy transportation and hoisting. Its socket 2 and spigot 3 are connected by a socket-splitting method to form a continuous box channel, ensuring smooth water flow. A sealing component 4 is set at the interface, including a water-swellable waterstop strip 41 and an elastic sealant 42. The waterstop strip 41 expands to fill the gap when in contact with water, while the elastic sealant 42 further seals the micropores, thereby effectively preventing leakage and improving the waterproof reliability of the structure. In implementation, the waterstop strip 41 is first installed in the groove 11 reserved inside the socket 2, and lubricant is applied to the outer surface of the spigot 3 to facilitate docking. The prefabricated box unit 1 is hoisted using lifting equipment, and the spigot 3 is slowly inserted into the socket 2. During the process, tension is applied by the tension element 12, such as steel strand, in the reserved groove 11 to evenly control the interface gap within 5mm, avoid stress concentration, and ensure a stable connection. The auxiliary structures 5, such as inspection wells 51 and sedimentation wells 52, are integrated with the precast box unit 1. The inspection well 51 is equipped with a fall prevention net and is fixed by anchors to prevent foreign objects from falling. The bottom elevation of the sedimentation well 52 is 0.5 meters lower than the pipeline to facilitate sedimentation. During implementation, the outside of the box is coated with an epoxy anti-corrosion coating to resist soil and moisture corrosion and extend service life. During the overall construction, trench excavation and foundation treatment are carried out according to the survey and layout. After the box is installed, it is backfilled and compacted in layers to ensure that the surrounding compaction meets the standards, thereby achieving rapid assembly, high sealing and long-term stability, and effectively improving the efficiency of urban drainage.

[0029] In a preferred embodiment, the sealing component 4 is disposed in corresponding mounting grooves on the inner wall of the socket 2 and the outer wall of the spigot 3. The waterstop strip 41 is made of a water-swellable material. Specifically, this design is based on the characteristics of water-swellable materials. The waterstop strip 41 is disposed in corresponding mounting grooves on the inner wall of the socket 2 and the outer wall of the spigot 3. The prefabricated reserved groove 11 structure ensures accurate positioning and fixation of the waterstop strip 41. During implementation, the surface of the mounting groove is first cleaned to remove impurities and oil stains. Then, the water-swellable waterstop strip 41 is pressed into the groove. Its elastic deformation adapts to the joint gap. When it comes into contact with water, the material expands and fills the microscopic gaps, forming an active sealing barrier, effectively preventing leakage and improving the durability of the joint. During installation, it is necessary to ensure that the waterstop strip 41 is straight and without twisting, and works in conjunction with the elastic sealant 42. The latter is injected into the gap after the joint is joined, further compensating for displacement caused by deformation and temperature changes, thereby enhancing the overall waterproof reliability. In terms of technical effect, this design simplifies the on-site construction steps, reduces the dependence on manual skills, and reduces the need for long-term maintenance through the material's self-adaptability.

[0030] In a preferred embodiment, the tensioning element 12 is a steel strand, and the reserved groove 11 penetrates the wall thickness of the precast box unit 1. The reserved groove 11 is configured to apply prestress to the interface gap between the socket 2 and the spigot 3 by tensioning equipment during tensioning. Specifically, this design is based on the principle of prestress control. Steel strands are used as tensioning elements 12, passing through the reserved groove 11 of the precast box unit 1. Tensioning equipment is used to apply uniform prestress during interface connection, thereby precisely adjusting the gap between the socket 2 and the spigot 3, ensuring a tight interface and reasonable stress distribution. In implementation, a reserved groove 11 penetrating the wall thickness is first reserved during the manufacturing process of the precast box unit 1. During installation, the steel strands are passed through the reserved groove 11 and connected to tensioning equipment such as jacks. Slow tensioning is used to uniformly reduce the interface gap to less than 5 mm. This process requires simultaneous monitoring of the gap value to avoid excessive tightness or looseness. Technically, this effectively prevents interface leakage and deformation caused by long-term settlement, improving the overall structural stability and sealing.

[0031] As a preferred embodiment, based on the high adhesion and chemical stability of epoxy-based materials, the outer surface of prefabricated unit 1 is subjected to multi-layer coating treatment during the prefabrication stage in the factory, forming a continuous and dense protective film to isolate corrosive media in water and soil. In practice, the surface of the unit is first sandblasted to remove rust and achieve the required cleanliness, followed by the application of an epoxy primer to enhance adhesion, and then layered application of an epoxy coal tar topcoat to form a composite coating with a dry film thickness of not less than 0.60 mm. The technical effect is that it resists electrolytic corrosion and microbial erosion through a dual mechanism of chemical bonding and physical shielding, significantly extending the structural lifespan. This embodiment is integrated with the rapid assembly logic of No. 1, ensuring the long-term stability of prefabricated components in the buried environment.

[0032] As a preferred implementation, based on the principle of multiple protections, a fall-prevention net is installed at the opening of inspection well 51 and fixed with anchors to prevent foreign objects from falling in. During implementation, anchor points are first pre-embedded inside the well opening, then the high-strength fall-prevention net is hung and tensioned to ensure that the net covers the entire well opening and fits tightly against the well wall. This significantly improves the safety of inspections and maintenance, preventing accidents. The assembly structure of the fall-prevention net is as follows: Figure 1 The assembly drawing of the manhole cover clearly shows the connection method between the net and the anchor. Meanwhile, the adjustable manhole cover, made of ductile iron, is designed with an adjustable mechanism. The precise fit between the cover and the manhole ring allows for height adjustment to accommodate road settlement. During implementation, an adjustable manhole seat is installed at the manhole opening, and the cover's elevation is finely adjusted via a threaded or shim system to ensure it is flush with the road surface and provides reliable theft prevention. Technically, this achieves long-term stability and anti-settlement functionality, reducing maintenance requirements. The specific structure of the manhole cover can be found in the detailed drawing of the rainwater manhole cover, as shown, further clarifying the layout of the reinforcing ribs in the ductile iron.

[0033] The construction method for rapid prefabricated rainwater tank structures under urban roads includes the following steps: S1. Construction preparation: Conduct on-site surveys and measurements to determine the pipeline center and excavation boundary, and complete traffic management and fencing setup. S2. Trench excavation: Based on geological conditions and excavation depth, appropriate support structures are adopted. After excavation to the predetermined elevation, a protective layer is retained and manually trimmed. S3. Foundation Treatment: Inspect the bottom of the foundation pit, select the appropriate foundation treatment method based on the geological survey results, and conduct foundation bearing capacity testing; S4. Box installation: The prefabricated box unit 1 is hoisted by a lifting device, and adjacent prefabricated box units 1 are connected through the socket 2 and the spigot 3. A sealing component 4 is set at the interface and the interface gap is controlled by the pull element 12. S5. Backfilling and compaction: After the prefabricated box unit 1 is installed, backfilling is carried out in layers. Manual backfilling is used in a specific area around the prefabricated box unit 1, and mechanical compaction is used in the remaining areas. S6. Road surface restoration: After backfilling is completed, restoration work shall be carried out according to the original road surface structure.

[0034] Specifically, the first step is the preparation of construction technology: (1) Familiarize yourself with and review the construction drawings Before construction began, the project team organized personnel to review the drawings, and the designers conducted a joint review of the drawings and a design briefing to address the relevant issues raised during the review.

[0035] (2) Based on the construction drawings, prepare a feasible construction plan. Based on the design documents, construction drawings, and relevant specifications and regulations, and in accordance with the requirements of the construction contract, formulate an economical and reasonable construction plan, submit it to the supervising engineer for approval, and organize its implementation. Before the commencement of construction, organize relevant personnel to conduct technical and safety briefings.

[0036] (3) Measurement verification ① Based on the traverse points, leveling points and measurement data provided by the design unit, re-measure the control network; and submit the re-measurement report of the stakeout to the supervising engineer for approval.

[0037] ② Before constructing the foundation reinforcement for the drainage pipeline, verify the elevation and axis position of the bottom of the foundation pit; Then, based on the site layout, prepare materials and temporary facilities before construction begins. Based on the plan for the required quantity of major machinery and equipment, organize the entry, installation, and commissioning of machinery and equipment in a timely manner to ensure their use. Before the construction of drainage pipelines, survey the surrounding environment, avoid construction areas such as dilapidated buildings and cultural relics, and conduct a survey of the existing drainage pipelines, verify the connection positions of the new and old pipelines, and re-measure the ground and existing pipeline elevations. Before constructing a pipeline route, the connection manholes should be located, and data such as the manhole surface elevation, manhole bottom elevation, water level elevation inside the pipe, and water level elevation inside the manhole should be measured. Before construction, a site handover meeting for underground pipelines should be organized, with the owner, construction team, supervisor, geophysical survey personnel, and pipeline owners present. A handover record should be made, and a re-survey must be conducted based on the handover record before trench excavation. Appropriate protective measures should be taken during construction. When conflicts with underground pipelines are encountered, reasonable relocation or avoidance measures should be taken to ensure the normal use of the original pipelines. If rerouting or relocation is necessary, a feasible plan must be developed, submitted to the construction unit, and approved by the participating parties and relevant pipeline owners before implementation to ensure that the functionality of the new pipeline is not affected. The surveyor lays out the center line and excavation edge line of the proposed pipeline and marks them on site with red paint. The elevation and length of the route from the starting point of the proposed route to the connection well are measured. Based on the design longitudinal slope, the pipeline excavation depth is calculated from the lowest point of the route or the point farthest from the connection well, so as to ensure both the basic burial depth of the pipeline and the ability to introduce water into the connection well. The following instructions apply to the foundation treatment and pit support for drainage pipes in drainage units: (1) For pipelines with longitudinal sections, the pipe pit support and soft soil treatment shall be carried out in accordance with the drawings; (2) For pipelines without longitudinal sections, the following principles shall be followed for pipe pit support and soft soil foundation treatment: (a) For pipelines with an excavation depth h≤2.0m, the support method (retaining plate support) shall be considered during construction. It is tentatively decided to use 300mm thick 1:1 crushed stone and sand for treatment.

[0038] (b) For pipelines with an excavation depth of 2.0m < h ≤ 3.0m, it is tentatively agreed to use type A support ([28c] channel steel) and to use 1:1 crushed stone sand with a thickness of 300mm for treatment.

[0039] (c) For pipelines with an excavation depth of 3.0m < h ≤ 4.0m, it is tentatively planned to use type B support (6m Larsen III steel sheet piles) and to use 300mm thick 1:1 crushed stone and sand for replacement.

[0040] (3) If any unmentioned areas or if the on-site excavation reveals that the geology at the bottom of the pipe is obviously poor (such as the presence of thick silt), the survey and design personnel should be notified immediately for handling. After the road surface demolition and support structure construction are completed, earthwork excavation can continue. During construction, excavation should be continuous, and backfilling should be carried out in a timely manner to ensure that there is no load or water accumulation at the top of the slope. A dedicated person should be assigned to observe the slope condition to ensure its stability. Simultaneously, a water pump should be installed downstream to promptly drain groundwater. When replacement is required by the design, the trench should be cleaned as required and inspected to ensure it passes inspection. To prevent disturbance to the soil layer at the bottom of the trench, mechanical excavation should be limited to 20-30 cm above the trench bottom elevation. The portion below this level should be excavated manually, and the trench bottom should be trimmed. Excavated soil should be transported immediately to the location designated by the owner. Soil should not be piled up along the trench edges to reduce lateral pressure on the trench walls. To ensure the strength and stability of the soil at the bottom of the trench, over-excavation and disturbance are prohibited during construction. If over-excavation or disturbance occurs, foundation treatment must be carried out according to the following procedures: (1) When there is local over-excavation or disturbance at the bottom of the trench, the handling shall comply with the following provisions: When the over-excavation depth does not exceed 150mm, the original soil from the excavated trench can be used for backfilling and compaction, and its compaction degree should not be lower than the density of the foundation soil. The soil at the bottom of the trench has a high moisture content and is not suitable for compaction. Effective measures such as replacement should be taken.

[0041] (2) When poor drainage causes disturbance to the foundation soil, the following methods can be used to deal with it: If the disturbance depth is within 100mm, it is advisable to fill it with natural graded crushed stone or gravel. If the disturbance depth is within 300mm but the lower part is hard, it is advisable to fill it with pebbles or boulders, then fill the gaps with gravel and level the surface.

[0042] Pipe foundation construction must be carried out in dry trenches. If groundwater is encountered, forced drainage using side ditches should be employed. If ground treatment is required in the design, it must be completed and tested before foundation construction. A post-cast section should be reserved during pipe foundation construction. When the pipe seat and foundation are poured in layers, the foundation should first be roughened and cleaned. The junction between the foundation and the pipe body should be filled and compacted with cement mortar of the same strength grade before pouring concrete to ensure a tight bond between the pipe body and the foundation concrete. When the pipe seat and foundation are poured in one go using the block method, concrete must be poured from one side first. Once the concrete on the opposite side is higher than the bottom of the pipe and the height of the poured concrete is the same, both sides should be poured simultaneously, maintaining a consistent concrete height on both sides. Class II reinforced concrete pipes use sliding rubber ring sealed socket connections, while ductile iron pipes use T-type interfaces and socket connections. The insertion direction of socket 2 and spigot 3 is consistent with the direction of normal water flow. The precast box unit 1 uses a socket joint 3 connection method and is installed by hoisting. A water-swellable waterstop strip 41 is installed in the groove 11 reserved on the side of the socket 2 at the end of the precast box unit 1. After the socket is installed, high elastic sealant 42 is filled into the gap. The channel box is connected by passing steel strand through the reserved groove 11 and pulling it tight with a jack so that the gap between the two sections is less than 5mm. After the channel box is closed, the steel strand is pulled out and the reserved hole is sealed by filling with high-strength non-shrink grout. Dimensions and style of auxiliary structures 5 (1) Inspection well 51 and its cover: The manhole covers should be adjustable, anti-settlement, and anti-theft heavy-duty manhole covers (ductile iron), and must meet the requirements of the "Technical Specifications for the Construction of Manhole Cover Facilities". The manhole covers must be marked with "sewage" and "rainwater". After the completion of inspection well 51, a safety net should be hung inside the well opening to prevent foreign objects from falling in. For inspection wells 51 with a depth of less than 1.0m and a well opening diameter of less than 630mm, a fall protection net is not required. The bottom elevation of the sedimentation well 52 should be set 0.5m lower than the bottom of the pipe. The surface elevation of all inspection wells 51 in driveways, sidewalks, and non-motorized vehicle lanes should be level with the designed road surface. The surface elevation in the diagram is for reference only and should be adjusted according to the actual ground elevation during construction. For rainwater inspection wells 51 located in saucer-shaped ditches, the well surface should be 10cm higher than the planting soil layer of the saucer-shaped ditches. If a horizontal inlet is installed in a driveway, the well surface should be 3-5cm lower than the road surface. Inspection wells 51 are located in existing farmland or weedy areas. The elevation of the well surface of inspection well 51 is required to be 30cm higher than the ground. The concrete foundation of the well chamber should be poured at the same time as the pipeline foundation.

[0043] The construction of inspection well 51 shall comply with the following regulations: (1) The prefabricated components and their accessories have been inspected and found to meet the design and installation requirements; (2) The prefabricated components are correctly positioned and sized, and are securely installed; (3) When cement mortar is used for joints, the tongue and groove joints should be fully grouted and the vertical joints should be fully grouted. During the hardening and setting of the mortar after assembly, it should be strengthened and should not be subjected to external impact or vibration. (4) When a rubber sealing ring is provided, the rubber ring should be installed firmly and the water stop should be tight and reliable; (5) The joints between the base plate and the well chamber, and between the well chamber and the cover plate, should be filled tightly with cement mortar and the corners should be smooth and flat.

[0044] For well chambers with branch and connecting pipes, the reserved branch and connecting pipes should be installed at the same time as the well chamber construction. The diameter, direction and elevation of the reserved pipes should meet the design requirements, and the connection between the pipe and the well wall should be tight. The reserved pipe opening of the drainage inspection well 51 should be sealed and smoothed with low-strength mortar.

[0045] The internal treatment of the well chamber shall comply with the following regulations: (1) Reserved holes and embedded parts shall meet the design and pipeline construction process requirements; (2) The surface of the flow channel of the drainage inspection well 51 should be smooth, round and clean, and connected to the bottom of the upstream and downstream pipes.

[0046] The concrete pavement will be demolished using an excavator. Before demolishing the pavement, it is necessary to check for any nearby pipeline markers and take care to avoid gas, communication, and cable pipelines. The existing pavement includes sidewalk bricks, granite, and marble, which will be removed manually. During the demolition process, care must be taken to protect the paving bricks. After the construction is completed, the pavement will be restored according to the design requirements in the drawings.

[0047] After the pipeline project has passed the concealed acceptance inspection of the main structure by the supervising engineer, backfilling should be carried out promptly. This is to prevent the trench from collapsing due to prolonged drying, which could damage the pipes or cause the pipe joints to crack and become hollow. During the rainy season, the trench may become waterlogged, pipes may float, or backfilling operations may become difficult. Backfilling can only be carried out after the pipeline structure has passed the acceptance inspection, and backfilling should be carried out in a continuous process with trench excavation as much as possible.

[0048] (1) Ensure the quality of backfill soil. Backfill stone chips from the pipe foundation to the road structure and compact them with water. The compaction on both sides of the pipe pit should not be less than 95%, and the remaining compaction should be compacted according to the drawings.

[0049] (2) Backfill material within 500mm above the pipe and on both sides of the pipe should be transported into the trench by supporting the sides of the trench. It should not be backfilled directly on the pipe. When backfilling other parts, it should be transported into the trench evenly and should not be pushed in at one time.

[0050] (3) Backfilling of the trench must be done manually from the bottom of the pipe foundation to 500mm above the top of the pipe. For the part above 500mm above the top of the pipe, mechanical compaction can be carried out simultaneously from both sides of the pipe axis; the height of each backfill layer should not exceed 200mm.

[0051] (4) Before backfilling, remove debris and drain water from the trench. There should be no broken bricks or stones in the backfill soil.

[0052] (5) When backfilling in sections, the joints between adjacent sections should be stepped and compaction should not be missed.

[0053] (6) When using light compaction equipment, the compaction should be continuous; when using a road roller, the overlap width of the compaction should not be less than 200mm. When using compaction machinery such as road rollers and vibratory rollers, the travel speed should not exceed 2km / h; After all pipeline construction and backfilling are completed, the roadbed is compacted, and once the compaction degree meets the requirements, repairs are carried out according to the design requirements.

[0054] The above describes the working principle of the rapid assembly rainwater tank structure and construction method under the city's roads.

Claims

1. A quick-assembly rainwater tank structure under urban roads, comprising a prefabricated tank unit (1), characterized in that: The prefabricated box unit (1) comprises a socket (2) and a spigot (3), the socket (2) and the spigot (3) are connected to adjacent two groups of the prefabricated box unit (1) by means of socket and spigot, so that several groups of the prefabricated box unit (1) form a continuous box passage, the position where the socket (2) and the spigot (3) are connected is provided with a sealing assembly (4), the sealing assembly (4) comprises a water stop strip (41) and an elastic sealing glue (42), one side of the prefabricated box unit (1) is provided with a reserved groove (11), one side of the reserved groove (11) is provided with a tensioning element (12), the interface gap of the socket (2) and the spigot (3) is maintained uniform through the tensioning effect of the tensioning element (12), the external shape of the prefabricated box unit (1) is configured as a cuboid, the other side of the prefabricated box unit (1) is further connected with an auxiliary structure (5), the auxiliary structure (5) comprises an inspection well (51) and a sand trap (52).

2. The urban road under quick-assembly rainwater tank structure according to claim 1, characterized in that: The sealing assembly (4) is arranged in the corresponding installation groove of the inner wall of the socket (2) and the outer wall of the spigot (3), and the water stop strip (41) is made of water-swelling material.

3. The urban road under quick assembly type rainwater tank structure according to claim 1, characterized in that: The tensioning element (12) is a steel strand, the reserved groove (11) penetrates the thickness of the box wall of the prefabricated box unit (1), and the reserved groove (11) is configured to apply prestress to the interface gap of the socket (2) and the spigot (3) through tensioning equipment during tensioning.

4. The urban road under quick assembly type rainwater tank structure according to claim 1, characterized in that: The prefabricated box unit (1) is coated with a corrosion-resistant coating, and the corrosion-resistant coating is made of epoxy-based material to resist water and soil corrosion.

5. The urban road under quick assembly type rainwater tank structure according to claim 1, characterized in that: The well mouth of the inspection well (51) is provided with a falling prevention net, the falling prevention net is fixed to the well mouth of the inspection well (51) through an anchoring member, an adjustable well cover is arranged above the falling prevention net, and the adjustable well cover is made of nodular cast iron.

6. The construction method of the quick-assembly rainwater tank structure under the urban road, which is applicable to the quick-assembly rainwater tank structure under the urban road as claimed in any one of claims 1-5, characterized in that, The method comprises the following steps: S1, construction preparation: on-site investigation and measurement and layout are performed, the pipeline center and the excavation boundary line are determined, and traffic diversion and fence setting are completed; S2, trench excavation: according to the geological conditions and the excavation depth, a corresponding supporting structure is used, and after excavation to the predetermined elevation, a protection layer is reserved for manual finishing; S3, foundation treatment: the bottom surface of the foundation pit is accepted, a corresponding foundation treatment method is selected according to the geological survey result, and the foundation bearing capacity is detected; S4, box installation: the prefabricated box unit (1) is hoisted by using a hoisting device, adjacent prefabricated box units (1) are connected through the socket (2) and the spigot (3), the sealing assembly (4) is arranged at the interface part, and the interface gap is controlled by using the tensioning element (12); S5, backfilling and compaction: after the prefabricated box unit (1) is installed, the backfilling is performed in layers, the surrounding of the prefabricated box unit (1) is manually backfilled according to the range determined according to the backfilling thickness, and the remaining parts are mechanically compacted; S6, road surface recovery: after the backfilling is completed, the original road surface structure is recovered.

7. The construction method of the urban road under quick assembly rainwater tank structure according to claim 6, characterized in that: In step S2, the supporting structure is selected according to the excavation depth: A soil retaining plate is used for shallow excavation; A channel steel is used for medium depth; A steel sheet pile is used for high depth; Horizontal and vertical supports are arranged between the supporting structures.

8. The construction method of the quick-assembly rainwater tank structure under the urban road according to claim 6, characterized in that: In step S4, the water stop (41) is arranged on the inner working surface of the socket (2), lubricant is applied on the outer working surface of the spigot (3), and the precast box unit (1) is accurately positioned and connected by the tensioning equipment through the pulling element (12), and then inspection and acceptance are carried out.

9. The construction method of the quick-assembly rainwater tank structure under the urban road according to claim 6, characterized in that: In step S5, the precast box unit (1) is synchronously backfilled on both sides, the thickness of each layer of backfill is controlled within a predetermined range, and when the mechanical compaction is used, the predetermined advancing speed and overlapping width according to the backfill thickness are adopted, so that the compaction degree meets the design requirements.

10. The construction method of the quick-assembly rainwater tank structure under the urban road according to claim 6, characterized in that: The construction process also includes all-weather monitoring, which includes foundation pit deformation monitoring, underground water level monitoring and surrounding building settlement monitoring, and dynamically adjusts the construction parameters and takes corresponding reinforcement measures according to the results of the foundation pit deformation monitoring, underground water level monitoring and surrounding building settlement monitoring.

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