Assembled drainage system suitable for complex environment and construction method

Abstract

The invention discloses an assembled drainage system suitable for a complex environment and a construction method. An assembled drainage system suitable for the complex environment is urgently needed, and the modular structure of the assembled drainage system meets the requirements for efficient construction and rapid drainage in the complex environment. The drainage ditch is formed by splicing a plurality of prefabricated sections; sewers are arranged below the drainage ditches; a rectangular groove is formed in the center of the top face of the sewer foundation, and a water seepage and drainage net pipe and medium-coarse sand gravel are arranged in the rectangular groove. Medium-coarse sand gravels are filled in the seepage ditch and the space above the seepage ditch foundation, and a seepage and drainage net pad is laid in the medium-coarse sand gravels; and the inspection wells are longitudinally arranged at intervals along the drainage ditches and the sewers. The drainage device can achieve rapid drainage, reduce labor intensity, improve construction efficiency and improve construction conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of roadbed drainage, and particularly relates to a spliced drainage system suitable for complex environments and a construction method. BACKGROUND

[0002] Under complex environmental conditions, there are three major pain points in the construction of traditional cast-in-place drainage ditches: cast-in-place concrete construction causes damage to plant root systems and soil disturbance, has a significant impact on the ecological environment; the concrete curing period restricts the progress of the project, and the construction efficiency is low; and the lack of structural integrity may cause crack leakage problems. Therefore, there is an urgent need for a spliced drainage system suitable for complex environments, which has a modular structure that meets the requirements of efficient construction and rapid drainage in complex environments, and has good application prospects. SUMMARY

[0003] In order to make up for the shortcomings of the prior art, the application provides a spliced drainage system suitable for complex environments and a construction method, which has good structural stress, can realize rapid drainage, reduces labor intensity, improves construction efficiency, improves construction conditions, and reduces environmental pollution.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows: A spliced drainage system suitable for complex environments, comprising a drainage ditch, the drainage ditch is spliced by a plurality of prefabricated segments, and a prefabricated cover plate is arranged at the top of the drainage ditch; hoisting holes are symmetrically arranged on the two side walls of the prefabricated segment; A seepage ditch is arranged below the drainage ditch, and a seepage ditch foundation is arranged at the bottom; a rectangular groove is arranged at the center position of the top surface of the seepage ditch foundation, a seepage drainage mesh pipe and medium-coarse gravel are arranged in the rectangular groove; in the seepage ditch, medium-coarse gravel is filled in the space above the seepage ditch foundation, and a seepage drainage mesh mat is arranged in the medium-coarse gravel; the seepage drainage mesh mat is in the shape of a door, comprising two side surfaces and a top surface; Inspection wells are arranged along the longitudinal distance of the drainage ditch and the seepage ditch, and the inspection well comprises an inspection well foundation, and a plurality of pipe segments are arranged on the inspection well foundation.

[0005] Further, at the connecting position of the two adjacent prefabricated segments, a bolt is embedded in one of the prefabricated segments; a connecting groove is arranged in the other prefabricated segment, a through hole is arranged on the side of the connecting groove, the bolt passes through the through hole and is connected by a nut, thereby connecting the two adjacent prefabricated segments.

[0006] Further, the connecting groove is filled with cement mortar.

[0007] Further, a stainless steel filter screen is embedded in the hoisting hole.

[0008] Further, a U-shaped groove is arranged at the top of the prefabricated segment.

[0009] Furthermore, the contact surfaces of two adjacent prefabricated segments are coated with emulsified asphalt.

[0010] Furthermore, a composite anti-seepage layer is provided at the bottom of the prefabricated segment.

[0011] Furthermore, ladder steel bars are provided on the inner wall of the inspection well.

[0012] Furthermore, a manhole cover is provided at the top of the inspection well, and the manhole cover includes a cover plate, and the cover plate is provided with handle steel bars.

[0013] A construction method for an assembled drainage system suitable for use in complex environments comprises the following steps: Step 1: Construction preparation and trench excavation; Step 2: Seepage ditch construction; 2.1 Installation of bottom prefabricated foundation: hoist the seepage trench foundation into place, adjust the elevation and fix it, and apply asphalt waterproofing layer in the rectangular groove; 2.2 Laying of drainage pipes; 2.3 Laying the filter layer: backfill medium-coarse sand and gravel in layers above the drainage network pipe. After the backfilling of medium-coarse sand and gravel is completed, lay the drainage network mat inside. 2.4 Layered backfilling and compaction: Use graded gravel to backfill the internal cavity of the drainage mat in layers until the design elevation; Step 3: Drain installation 3.1 Laying of anti-seepage layer; 3.2 Segment lifting; 3.3 Joint treatment: The automatic gluing robot accurately applies modified asphalt sealant and simultaneously applies the bolt pre-tightening force in stages; 3.4 Connection groove sealing: Use vacuum infusion process to inject early strength epoxy mortar, and set nano hydrophobic coating on the surface; 3.5 Cover installation; Step 4: Inspection well construction 4.1 Inspection well foundation hoisting and positioning; 4.2 Pipe joint assembly and mortise and tenon connection; 4.3 Installation of ladder steps and manhole covers; 4.4 Grouting reinforcement and waterproofing treatment; Step 5: System testing and acceptance.

[0014] Beneficial effects of the present invention: 1) In this invention, emulsified asphalt is evenly applied to the segment assembly section to ensure the sealing of the drainage ditch and avoid sediment accumulation or groove deformation caused by slight repeated water infiltration. The reserved bolts on one side of the segment are used to anchor the adjacent segment with the matching nuts, and the reserved connection groove is sealed with cement mortar, which has high construction efficiency and good structural stress resistance. 2) The prefabricated cover plate with uniformly distributed round holes is arranged at the top of the water ditch, and large-particle impurities such as leaves and plastic bags are effectively intercepted by accurately controlling the hole diameter, so that the drainage channel is prevented from being blocked, and the surface runoff collection efficiency is improved, and the top of the cover plate can be used as a temporary passage for small maintenance machinery.

[0015] 3) The prefabricated foundation at the bottom of the infiltration ditch realizes accurate positioning and stable fixing of the drainage pipe network through the reserved rectangular groove, effectively avoids the problem of pipe network deviation, and enhances the overall structural stability; the upper gradient inverse filtration system forms an efficient water permeable barrier through the combination of medium-coarse gravel and three-dimensional net pads, which can intercept fine particles to prevent clogging and accelerate the efficiency of groundwater collection.

[0016] 4) The inspection well realizes stable connection of the foundation and the pipe joint through the mortise and tenon type plug-in structure, significantly improves the construction efficiency, reduces the amount of on-site wet work, reduces the disturbance to the environment, and meets the green construction requirements. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a plan view of the assembled drainage system of the present application; Figure 2 is a cross-sectional view of the assembled drainage system of the present application; Figure 3 is a longitudinal sectional view of the inspection well of the present application; Figure 4 is a longitudinal sectional view of the well top pipe joint of the present application; Figure 5 is a longitudinal sectional view of the intermediate pipe joint of the present application; Figure 6 is a longitudinal sectional view of the well bottom pipe joint of the present application; Figure 7 is a I-I sectional view of the inspection well of the present application; Figure 8 is a structural view of the well cover of the present application; Figure 9 is a longitudinal sectional view of the present application; In the figure, 1. prefabricated segment, 2-1. bolt, 2-2. nut, 3. connecting groove, 4. prefabricated cover plate, 5. hoisting hole, 6. drainage net pad, 7. medium-coarse gravel, 8. infiltration ditch foundation, 9. drainage net pipe, 10. pipe joint, 10-1. well top pipe joint, 10-2. intermediate pipe joint, 10-3. well bottom pipe joint, 11. inspection well foundation, 12. ladder reinforcement, 13. well cover, 13-1. cover plate, 13-2. handle reinforcement. DETAILED DESCRIPTION

[0018] The present application will be described in detail below in conjunction with specific embodiments.

[0019] The present invention provides an assembled drainage system and construction method suitable for complex environments. The structure has good stress resistance, can achieve rapid drainage, reduce labor intensity, improve construction efficiency, improve construction conditions, and reduce environmental pollution.

[0020] like Figure 1 As shown, the assembled drainage system of the present invention includes a drainage ditch, which is spliced ​​together by multiple prefabricated segments 1, and a composite anti-seepage layer is arranged at the bottom of the prefabricated segment 1; a prefabricated cover plate 4 is arranged on the top of the drainage ditch, and a U-shaped groove with a width of 400 mm and a depth of 150 mm is arranged longitudinally on the top of the prefabricated segment 1 for accommodating the prefabricated concrete cover plate 4. The prefabricated cover plate 4 adopts a hollow pattern design, and the opening rate is controlled at 25%-35%, which not only ensures traffic safety but also meets greening needs.

[0021] Precast segment 1 is constructed of basalt fiber-reinforced concrete. To facilitate installation by small hoisting machinery, the longitudinal length of the ditch is generally 0.3 to 0.6 m, with a maximum length of no more than 1 m. Three sets of lifting holes 5 with a diameter of Φ100 mm are symmetrically arranged on both side walls of precast segment 1. In addition to meeting the requirements for small cranes weighing ≤3 tons, these holes also serve as permanent drainage holes. A 304 stainless steel filter mesh with a porosity of ≥40% is embedded in the lifting holes 5, providing an effective drainage capacity of 0.8 L / s·m.

[0022] At the connection point between two adjacent precast segments 1, a 304 stainless steel bolt 2-1 with an M24 diameter is embedded in one precast segment 1. A connecting groove 3 is provided in the other precast segment 1, with a Φ32mm through-hole on the airside. Bolt 2-1 passes through this through-hole and is secured with an 8.8-grade high-strength nut 2-2, connecting the two adjacent precast segments 1. During assembly, preload is controlled using a torque wrench in three stages: 20% → 50% → 100% of the design value. C40 micro-expansive cement mortar is used for secondary sealing within the connecting groove 3, forming a flexible, self-locking joint. This connection must withstand an axial tensile force of 80kN and a bending moment of 15kN·m, with a joint watertightness of 0.3MPa and no leakage.

[0023] The contact surfaces of two adjacent prefabricated segments 1 are coated with emulsified asphalt. Before assembly, the segments' butt joints are evenly coated with modified emulsified asphalt containing ≥65% solids, specifically 3% nano-silica microcapsules with a particle size of 50-100nm. If microcracks ≥0.1mm appear in the structure, the microcapsules rupture under capillary action, releasing a repair agent that self-heals the cracks within 30 days.

[0024] like Figure 2 As shown, a seepage ditch is set below the drainage ditch, and a seepage ditch foundation 8 with a width of 1.0m is set at the bottom. The foundation 8 is cast with concrete of grade not less than C30, and its structural strength meets the mechanical performance requirements of the "Railway Roadbed Design Code" for underground drainage facilities; A rectangular recess is arranged at the center of the top surface of the infiltration trench foundation 8, and a drainage network pipe 9 and medium-coarse gravel 7 are arranged in the rectangular recess; the rectangular recess is formed by a precision mold forming process to achieve millimeter-level positioning accuracy, providing a directional installation reference for the drainage network pipe, and cooperating with the full-wrapping non-woven geotextile to protect the infiltration coefficient ≥ 1.0 × 10⁻³ cm / s, which can not only prevent fine-grained soil from invading the pipe network, but also form a water-permeable barrier to prevent pipe perimeter siltation; the medium-coarse gravel filled in the groove has a particle size of 5-20 mm and forms a three-dimensional interconnected pore structure after grading optimization, which ensures high permeability while intercepting more than 90% of the silt pollutant through the particle size screening effect; In the infiltration trench, medium-coarse gravel 7 is filled in the space above the infiltration trench foundation 8, and a drainage network mat 6 is arranged inside the medium-coarse gravel 7; the drainage network mat 6 is in the shape of a door, including two side surfaces and a top surface, and the thickness is not less than 50 mm; a transition layer of medium-coarse gravel 7 with a thickness of ≥ 15 cm is arranged between the drainage network mat 6 and the surrounding rock-soil medium; the drainage network mat material is made of HDPE modified polymer, with a tensile strength of more than 30 MPa, and a three-dimensional network structure is constructed to form multidirectional flow channels; In this embodiment, the drainage network pipe 9 adopts a high-strength filamentous internal support drainage network pipe, with a pipe material ring stiffness of not less than 16 kPa, a pipe wall void ratio of greater than 80%, and a 200g non-woven geotextile wrapping. The non-woven geotextile must be corrosion-resistant and anti-aging, with a breaking strength of not less than 6.5 KN / m, a bursting strength of not less than 0.9 KN, a tear strength of not less than 160 N, and good water permeability and filtration capacity, with a vertical permeability coefficient of not less than 3.5 × 10 -2 cm / s and an equivalent aperture of ≥ 0.1 mm; the drainage network mat has a void ratio of not less than 85%, a residual thickness of more than 45 mm under a pressure of not less than 50 kPa, and a 150g non-woven geotextile wrapping. The non-woven geotextile must be corrosion-resistant and anti-aging, with a breaking strength of not less than 4.5 KN / m, a bursting strength of not less than 0.6 KN, a tear strength of not less than 120 N, and good water permeability and filtration capacity, with a vertical permeability coefficient of not less than 3.5 × 10 -2 cm / s and an equivalent aperture of ≥ 0.07 mm.

[0025] As shown in Figure 3 , 4 , 5, 6, 7, and 9, the inspection well is arranged along the drainage ditch and the infiltration trench at an interval of 30 m, and the inspection well includes an inspection well foundation 11 and a plurality of pipe sections 10 arranged on the inspection well foundation 11; the foundation, the pipe sections, and the pipe sections are connected by a mortise and tenon joint structure; the pipe section 10 includes a well top pipe section 10-1, a middle pipe section 10-2, and a well bottom pipe section 10-3. A Φ16 mm ladder bar 12 is arranged on the inner wall of the inspection well at an interval of 300 mm.

[0026] As shown in Figure 8As shown, a manhole cover 13 is provided on the top of the inspection well. The manhole cover 13 includes a cover plate 13-1, and a handle steel bar 13-2 is provided on the cover plate 13-1.

[0027] The present invention also provides a construction method for an assembled drainage system suitable for use in complex environments, comprising the following steps: Step 1: Construction preparation and trench excavation 1.1 Site survey and design optimization: Construction deployment is carried out based on site survey data and design drawings, and the axes of seepage ditches and drainage ditches and the location of inspection wells are accurately located (set at intersections and slope change points according to the designed spacing); combined with geological survey data, the plane layout of seepage ditches and drainage ditches is adjusted, and the location of inspection wells is determined. Generally, one is set every 30-50 meters, and must be set at intersections or slope change points; 1.2 Surveying, staking out and excavation: After positioning with a total station, excavate the foundation trench in sections to ensure that the base elevation meets the design requirements. In frozen areas, the local freezing depth requirements must be met; the local freezing depth requirement is no less than 1.2m in frozen areas. The trench bottom width must reserve operating space, generally the structure width + 60cm. During the excavation process, reserve the necessary working surface, and the trench bottom width should be based on the structural design width plus operating space. 1.3 Foundation treatment: Clear the loose soil and debris in the foundation pit, lay a 10-15cm thick gravel cushion layer and tamp it. If necessary, pour a C15 concrete cushion layer as the foundation leveling layer.

[0028] Step 2: Seepage ditch construction 2.1 Installation of the bottom precast foundation: A total station positioning system is used to guide the precise lifting of precast concrete foundation modules, and a hydraulic leveling device is used to achieve dynamic calibration of the base elevation. Once the foundation is in place, polymer anchor bolts are used to lock the three-dimensional coordinates. The foundation trough is formed using a hot-melt spray process to form a continuous asphalt-based waterproof membrane layer. The membrane thickness uniformity is tested using a dielectric induction instrument to ensure a chemically inert interface with the subsequent permeable pipe network, blocking the capillary water erosion path. 2.2 Laying of drainage network pipes: embed high-density polyethylene (HDPE) double-wall corrugated pipes or permeable pipes into the foundation grooves, use rubber rings to seal the joints, and the longitudinal slope of the pipes must be ≥0.5% to ensure gravity drainage; 2.3 Laying the filter layer: backfill medium-coarse sand and gravel in layers above the drainage network pipe. After the backfilling of medium-coarse sand and gravel is completed, lay the drainage network mat inside. 2.4 Layered Backfill and Compaction: Use graded gravel to backfill the internal cavity of the drainage mat in layers to the designed elevation. Each layer should be no more than 30 cm thick, with a compaction level of no less than 90%. After each layer is compacted, perform a rapid test using a nuclear density meter and use a drop weight deflectometer to assess the uniformity of the structural modulus. Avoid heavy machinery directly rolling over the pipeline during the backfill process.

[0029] Step 3: Drain installation 3.1 Laying of anti-seepage layer: The bottom of the excavated trench is first subjected to laser scanning 3D modeling, and the base is trimmed using an automatic leveling robot, with a flatness error controlled at ±5mm / 2m. Subsequently, a two-cloth and one-membrane composite anti-seepage layer is laid. The upper and lower layers are 600g / ㎡ polyester filament non-woven geotextiles with a CBR bursting strength of ≥2.5kN, and the middle layer is a 0.3mm thick high-density polyethylene film with an elongation at break of ≥600%. The seams are treated using a double-weld hot-melt welding process with a welding temperature of 220±5℃ and a travel speed of 0.3m / min. The weld quality is tested by the vacuum pressure method. The pressure is 0.15MPa and maintained for 5 minutes without pressure drop, and the overall permeability coefficient is <1×10⁻ 7 cm / s; 3.2 Segment Hoisting The intelligent lifting equipment, which integrates the Beidou high-precision positioning system with real-time laser guidance technology, achieves four-point balanced force lifting through a set of heavy lifting anchor points symmetrically distributed on the side walls of the prefabricated segments. The lifting process strictly adheres to the following technical points: (1) Positioning control: The lifting equipment is equipped with a real-time differential positioning module, which is combined with the laser reference network of the groove axis to achieve dynamic correction of the segment's three-dimensional coordinates; (2) Anti-collision protection: The spreader is equipped with a pressure sensor to monitor the tension balance of the wire rope in real time to avoid the risk of collision between the segment and the trench wall; (3) Multifunctional lifting hole: The pre-buried lifting hole has a built-in high-strength stainless steel filter mesh, which has the dual functions of construction lifting point and water drainage during operation.

[0030] 3.3 Seam treatment Execute the coordinated process of mechanized sealing and structural anchoring: (1) Intelligent sizing system: A multi-joint robotic arm equipped with a constant pressure glue injection gun is used to continuously apply modified asphalt sealant containing nano-repair factors along the joints; The adhesive layer forms a continuous elastic sealing belt, effectively compensating for temperature deformation and slight settlement; (2) Gradual preload control: The embedded stainless steel bolt group is pre-tightened in three stages using a hydraulic torque wrench (initial positioning → half-load tightening → design load locking); Simultaneously monitor the changes in flange gap to ensure uniform distribution of compressive stress in the joint.

[0031] 3.4 Connection groove closure Implement high-performance composite barrier construction technology: (1) Vacuum infusion operation Grouting pipes and exhaust pipes are arranged around the perimeter of the closed connection groove, and low-viscosity epoxy-based mortar is injected through a negative pressure environment to ensure that the cavity filling density is greater than 98%; (2) Functional surface treatment After the initial solidification of the perfusion body, a nano-scale organic silicon hydrophobic coating is sprayed to form a micro-nano composite structure surface, which significantly reduces the adhesion of ice crystals and the probability of capillary water seepage; (3) Structural strengthening The enclosing body forms a chemical bond with the segmental concrete, improving the shear strength and fatigue resistance of the node area.

[0032] 3.5 Cover installation Perform precision matching installation process: (1) Interface enhancement processing Apply a two-component epoxy interface agent on the contact surface between the prefabricated cover plate tenon and the segmental U-shaped groove to activate the bonding properties of the concrete surface; (2) Limit control system An adjustable stainless steel limiter is used to constrain the three-dimensional displacement of the cover plate, and a laser line projector is used to calibrate the top surface elevation. (3) Eco-compatible design After the hollow cover is installed, a continuous drainage channel is formed, and the hole structure takes into account the efficiency of debris interception and the penetration requirements of surface vegetation.

[0033] Step 4: Inspection well construction 4.1 Hoisting and positioning of inspection well foundation: Use prefabricated reinforced concrete foundation, hoist it to the designated location and adjust the elevation. A height difference of 10-15 cm should be maintained between the foundation and the bottom of the drainage ditch to facilitate sand settling. 4.2 Pipe segment assembly and mortise and tenon connection: hoist the prefabricated shaft segment by segment, insert the mortise and tenon structure to a depth of ≥15cm, apply 1:2 waterproof cement mortar to the joints, and wrap the outside with steel mesh for reinforcement; 4.3 Installation of ladder steps and manhole covers: Embed Φ16mm ladder step steel bars in the pipe section, install a prefabricated manhole cover with handle steel bars on the top, and seal the gap between the manhole cover and the wellhead with a rubber strip; 4.4 Grouting reinforcement and waterproofing treatment: Low shrinkage cement slurry is poured in layers around the well body, penetrating into the filter layer to form a water-stop curtain, and the outer wall is painted with two coats of polyurethane waterproof coating; Step 5: System testing and acceptance 5.1 Water-tightness test: Conduct a 24-hour water-tightness test on the inspection well and pipeline network. The leakage volume must be ≤2L / (km·d). If it does not meet the requirements, local grouting is required to seal the leak.

[0034] 5.2 Functional testing: Use CCTV pipeline robots to detect internal patency to ensure there is no silt accumulation or interface misalignment.

[0035] 5.3 Backfill and road surface restoration: After passing the test, backfill the soil in layers to the roadbed elevation, and compact the top 30cm with fly ash soil.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0037] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. An assembled drainage system suitable for complex environments, characterized by: The drainage ditch comprises a plurality of prefabricated segments (1) spliced ​​together, and a prefabricated cover plate (4) is arranged on the top of the drainage ditch; and lifting holes (5) are symmetrically arranged on both side walls of the prefabricated segment (1); A seepage ditch is provided below the drainage ditch, and a seepage ditch foundation (8) is provided at the bottom; a rectangular groove is provided at the center of the top surface of the seepage ditch foundation (8), and a seepage drainage network pipe (9) and medium-coarse gravel (7) are provided in the rectangular groove; in the seepage ditch, the space above the seepage ditch foundation (8) is filled with medium-coarse gravel (7), and a seepage drainage network mat (6) is provided inside the medium-coarse gravel (7); the seepage drainage network mat (6) is in the shape of a gate, including two side surfaces and a top surface; The inspection wells are arranged at longitudinal intervals along the drainage ditch and the seepage ditch, and the inspection wells include an inspection well foundation (11), on which a plurality of pipe sections (10) are arranged.

2. The assembled drainage system suitable for use in complex environments according to claim 1, characterized in that: At the connection position of two adjacent prefabricated segments (1), a bolt (2-1) is pre-embedded in one prefabricated segment (1); a connection groove (3) is provided in the other prefabricated segment (1), a through circular hole is provided on the air-facing side of the connection groove (3), and the bolt (2-1) passes through the through circular hole and is connected by a nut (2-2) to achieve the connection of the two adjacent prefabricated segments (1).

3. The assembled drainage system suitable for use in complex environments according to claim 2, characterized in that: The connection groove (3) is filled with cement mortar for secondary sealing.

4. The assembled drainage system suitable for use in complex environments according to claim 3, characterized in that: A stainless steel filter is embedded in the hoisting hole (5).

5. The assembled drainage system suitable for use in complex environments according to claim 4, characterized in that: A U-shaped groove is provided on the top of the prefabricated segment (1).

6. The assembled drainage system suitable for use in complex environments according to claim 5, characterized in that: The contact surfaces of two adjacent prefabricated segments (1) are coated with emulsified asphalt.

7. The assembled drainage system suitable for use in complex environments according to claim 6, characterized in that: A composite anti-seepage layer is provided at the bottom of the prefabricated segment (1).

8. The assembled drainage system suitable for use in complex environments according to claim 7, characterized in that: Ladder steel bars (12) are provided on the inner wall of the inspection well.

9. The assembled drainage system suitable for use in complex environments according to claim 8, characterized in that: A manhole cover (13) is provided at the top of the inspection well. The manhole cover (13) comprises a cover plate (13-1). A handle steel bar (13-2) is provided on the cover plate (13-1).

10. A construction method for an assembled drainage system suitable for use in complex environments, characterized by: The steps include: Step 1: Construction preparation and trench excavation; Step 2: Seepage ditch construction; 2.1 Installation of bottom prefabricated foundation: hoist the seepage trench foundation (8) into place, adjust the elevation and fix it, and apply asphalt waterproofing layer in the rectangular groove; 2.2 Laying of drainage pipes; 2.3 Laying the filter layer: backfill the medium-coarse sand and gravel (7) in layers above the drainage network pipe (9). After the backfilling of the medium-coarse sand and gravel (7) is completed, lay the drainage network mat (6) inside it; 2.4 Layered backfilling and compaction: Use graded gravel to backfill the internal cavity of the drainage mat (6) in layers until the design elevation; Step 3: Drain installation 3.1 Laying of anti-seepage layer; 3.2 Segment lifting; 3.3 Joint treatment: The automatic gluing robot accurately applies modified asphalt sealant and simultaneously applies the bolt pre-tightening force in stages; 3.4 Connection groove sealing: Use vacuum infusion process to inject early strength epoxy mortar, and set nano hydrophobic coating on the surface; 3.5 Cover installation; Step 4: Inspection well construction 4.1 Inspection well foundation hoisting and positioning; 4.2 Pipe joint assembly and mortise and tenon connection; 4.3 Installation of ladder steps and manhole covers; 4.4 Grouting reinforcement and waterproofing treatment; Step 5: System testing and acceptance.

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