A drainage well reinforcement structure

Abstract

The utility model discloses a reinforced structure of drainage well, the drainage well well body adopts prefabricated assembled well shaft structure, and the prefabricated assembled well shaft is formed by the upper section well chamber and lower section well chamber link assembly, the top opening of upper section well chamber is equipped with the well lid, the both sides wall of lower section well chamber is equipped with the socket opening, the socket opening is linked with the drainage pipe, and the lower section well chamber lower extreme is equipped with the anti -settlement base. The reinforced structure of drainage well provided by the utility model adopts the assembled well shaft body structure, combines " well - pipe - road " integrated design, is applicable to the drainage well reconstruction project of city road, underground comprehensive pipe gallery and the like scene, satisfies the technical requirement of " outdoor drainage design specification (GB 50014) " to drainage structure durability and sealing.

Description

Technical Field

[0001] This utility model relates to the field of municipal water supply and drainage engineering technology, and specifically provides a drainage well reinforcement structure. Background Technology

[0002] Municipal drainage wells often face the following technical bottlenecks during road repairs: Settlement and cracking around the well: Traditional brick or cast-in-place concrete wells suffer from uneven settlement due to insufficient backfill compaction (usually ≤90%), with annual settlement generally exceeding 10mm, resulting in "well-mouth depressions" that cause vehicle bumps and road surface crack expansion; Sewage leakage and pollution: Cracks in the well walls (width ≥0.3mm) allow sewage to seep into groundwater. Monitoring data from a certain city shows that the COD concentration in the groundwater around leaking drainage wells exceeded the standard by 2.7 times; Long construction period: Traditional methods require excavation and repair (average construction period 5-7 days), causing traffic congestion. Municipal departments estimate that such construction affects approximately 5,000 vehicles per day; Pipe-well connection failure: Insufficient sealing at the interface between the well body and the drainage pipe leads to backflow of rainwater during heavy rains, causing overflow of the inspection well. In a case of urban flooding, 85% of the accidents were directly related to well pipe leakage.

[0003] To address the aforementioned common problems, the existing solutions and their shortcomings are as follows: Cast-in-place concrete reinforcement: requires on-site formwork and curing, has a long strength development period (≥7 days), and the interface between new and old concrete is prone to peeling; Grouting reinforcement: uneven grout diffusion (filling rate ≤70%), unable to completely cure structural cracks; Precast well ring installation: low standardization, difficult to adapt to different pipe diameters; Waterproof coating process: ordinary asphalt coatings cracking rate reaches 60% within 2 years under repeated vehicle rolling.

[0004] Therefore, providing a drainage well reinforcement structure is an urgent problem to be solved in response to the above issues. Utility Model Content

[0005] In view of this, the present invention provides a drainage well reinforcement structure to solve the problems of leakage at the connection between the well body and the pipeline, traffic interference during construction, and high maintenance costs throughout the entire life cycle in the prior art;

[0006] The technical solution provided by this utility model is: a drainage well reinforcement structure, wherein the drainage well body adopts a prefabricated assembled well cylinder structure, the prefabricated assembled well cylinder is composed of an upper well chamber and a lower well chamber connected and assembled; a well cover is provided at the top opening of the upper well chamber, and sockets are provided on both sides of the lower well chamber, the sockets are connected to the drainage pipe, and an anti-settlement base is provided at the lower end of the lower well chamber.

[0007] Preferably, a flexible transition layer is provided on the outer periphery of the top opening of the upper section of the well chamber. The flexible transition layer is distributed in a ring around the outer periphery of the top opening. The flexible transition layer includes a rubber asphalt composite layer and a polyurea waterproof coating layer from top to bottom. The flexible transition layer extends into the road structure layer.

[0008] Preferably, the upper well chamber and the lower well chamber are assembled by connecting them with a flange structure, and the joint is coated with an epoxy interface layer.

[0009] Preferably, the prefabricated assembled well shaft is a fiber-reinforced polymer concrete structure.

[0010] Preferably, the prefabricated assembled well casing has circumferential stiffening ribs on its outer wall.

[0011] Preferably, the anti-settlement base is composed of an outer double-layer steel plate and a middle C40 micro-expansion concrete layer;

[0012] The diameter of the anti-settlement base is larger than the outer diameter of the bottom of the prefabricated assembled well shaft;

[0013] The anti-settlement base is equipped with an anchoring system, which includes multiple anchor rods. The multiple anchor rods are radially distributed on the outer circumference of the anti-settlement base, and the multiple anchor rods pass through the anti-settlement base and the foundation in sequence.

[0014] Preferably, the socket and the drain pipe are provided with a buffer pad and a waterproof layer. The buffer pad is placed adjacent to the drain pipe and extends to the outside of the well. The buffer pad and the drain pipe outside the well are fixed by a clamp.

[0015] The waterproof layer is disposed in the gap between the socket and the buffer pad. The waterproof layer includes a rubber ring and a sealant, with the sealant filling the gap between the rubber ring and the buffer pad.

[0016] This utility model provides a drainage well reinforcement structure that adopts an assembled well cylinder body structure, combined with an integrated "well-pipe-road" design. It is suitable for drainage well renovation projects in urban roads, underground integrated pipe corridors, and other scenarios, meeting the technical requirements for durability and sealing of drainage structures in the "Outdoor Drainage Design Code" (GB 50014). The drainage well reinforcement structure provided by this utility model adopts a multi-stage sealing structure: the first stage is a rubber waterstop strip installed at the socket gap; the second stage is an MS adhesive filling layer (elastic modulus 0.5MPa); and the third stage is a FRPC well cylinder self-waterproofing system (permeability coefficient ≤1×10⁻¹¹m / s). Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0018] Figure 1A cross-sectional structural diagram of a drainage well reinforcement structure provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the socket interface structure in a drainage well reinforcement structure according to the present invention. Detailed Implementation

[0020] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention.

[0021] In existing technologies, to meet the requirements of seepage prevention at the connection between the well body and the pipeline, settlement control around the well, and rapid construction, this implementation plan provides a drainage well reinforcement structure, such as... Figure 1 As shown, the drainage well body adopts a prefabricated assembled well cylinder structure, which is composed of an upper well chamber 1 and a lower well chamber 2 connected and assembled. The top opening of the upper well chamber 1 is provided with a well cover 3, and the two side walls of the lower well chamber 2 are provided with sockets 4, which are connected to the drainage pipe 5. The lower end of the lower well chamber 2 is provided with an anti-settlement base 6.

[0022] In this implementation plan, the drainage well is prefabricated in two sections: the upper section has an inner diameter matching a standard well cover (Φ700mm), and the lower section has a socket joint for connection with existing drainage pipes. A sealing structure is installed at the joint, preferably a rubber ring + sealant structure; specifically as follows... Figure 2 As shown, a buffer pad 41 and a waterproof layer are provided at the insertion point of the socket 4 and the drain pipe 5. The buffer pad is placed adjacent to the drain pipe 5 and extends outside the well body. The buffer pad 41 is fixed to the drain pipe outside the well body by clamps. A rubber ring is used at the connection between the drain pipe and the well, and sealant is filled in. The buffer pad is placed close to the pipe to reduce the impact of road vibration and settlement on the pipe. Stainless steel clamps are used to fix the pipe and the buffer pad outside the well to ensure an effective connection between the pipe and the well.

[0023] The waterproof layer is disposed in the gap between the socket and the buffer pad, and the waterproof layer includes a rubber ring 42 and a sealant 43, with the sealant 43 filling the space between the rubber ring 42 and the buffer pad 41.

[0024] In addition, the drainage well provided in this implementation plan can also be equipped with a rapid backfilling system. The material used in this backfilling system is: self-compacting lightweight foamed concrete (hot foamed concrete with added hydrophobic agent (calcium stearate), water absorption rate ≤3%; conductivity 0.12W / (m•K, wet density ≤1000kg / m³, fluidity ≥180mm). The self-compacting lightweight foamed concrete can reduce structural deformation caused by thermal expansion and contraction. A built-in Φ50 grouting pipe is used for later grouting. Pressure injection equipment is used for layered backfilling, with each layer thickness ≤300mm and final setting time ≤2h.

[0025] A flexible transition layer 7 is provided on the outer periphery of the top opening of the upper section well chamber 1. The flexible transition layer 7 is distributed in a ring around the outer periphery of the top opening. The flexible sealing transition layer structure is as follows: the top of the well barrel expands outward to form a 300mm wide annular platform, which is formed by laying a 5mm thick rubber asphalt composite layer and spraying polyurea waterproof coating on the surface, extending 50mm into the road structure layer.

[0026] The performance of this flexible transition layer is: elongation at break ≥400%, and it can withstand ±8mm deformation without cracking.

[0027] This utility model adopts an integrated "well-pipe-road" design, with socket 4 compatible with drainage pipe diameters of Φ300-Φ800mm, solving the problem of drainage well renovation and reconstruction in most cases. The flexible transition layer extends into the road structure, eliminating the weak area of ​​traditional wellheads. Interface stress analysis and optimization of the socket angle (designed to be 5°) through finite element simulation ensure that the interface maintains its sealing performance under ±10mm displacement.

[0028] This utility model also includes a differential settlement resistance structure with a stiffness gradient transition: well shaft (elastic modulus 30GPa) → foamed concrete backfill layer (2GPa) → undisturbed soil (0.1GPa), forming a continuous stiffness change and reducing the risk of differential settlement; the expected differential settlement around the well after reinforcement is ≤0.5mm / year.

[0029] The upper well chamber 1 and the lower well chamber 2 are assembled by connecting them with a flange structure, and the joint is coated with an epoxy interface layer. The drainage well in this embodiment is also equipped with a grouting pipe and a reserved maintenance passage, which can be used for grouting reinforcement without breaking the road; the modular structure of the well shaft supports partial replacement, which reduces maintenance costs by 60%.

[0030] The prefabricated assembled well casing is a fiber-reinforced polymer concrete structure. Specifically, the fiber-reinforced polymer concrete composite material has the following characteristics: 1) it incorporates 2% basalt fiber and 10% silica fume, achieving a chloride ion permeability resistance of Class III (QB / TJ08-501); 2) after 300 freeze-thaw cycles, the mass loss is ≤0.5%, making it suitable for freeze-thaw regions in northern China; compressive strength is ≥45MPa, and the impermeability grade is P10.

[0031] The prefabricated assembled well casing has circumferential stiffening ribs on its outer wall. The stiffening ribs are 30mm high and spaced 200mm apart, which improves the earth pressure resistance to 0.15MPa.

[0032] The anti-settlement base 5 adopts a double-layer steel plate (Q355B, 12mm thick) sandwich structure, filled with C40 micro-expansion concrete in the middle. The base diameter is 400mm larger than the outer diameter of the well shaft. The diameter of the anti-settlement base 5 is larger than the outer diameter of the bottom of the prefabricated assembled well shaft. The anti-settlement base 5 is equipped with an anchoring system. The bottom of the anchoring system is welded with 6 Φ25 anchor rods 51, each 1.2m long, driven into the foundation in a quincunx pattern. The pull-out resistance of a single rod is ≥80kN. The anchor rods and base have a synergistic effect: the anchor rods are arranged in a quincunx pattern, and the pull-out safety factor is ≥2.5; the double-layer steel plates of the base are connected by studs, increasing the bending stiffness to 3 times that of ordinary concrete bases.

[0033] The drainage wells provided in this implementation plan can be repaired using a trenchless rapid repair process, with construction occupying ≤2m of lane width, and the traffic diversion plan optimized to "half-width closure, half-width traffic". Compared with traditional methods, construction noise is reduced by 20dB and dust is reduced by 90%. It integrates digital operation and maintenance: 1) BIM model pre-simulates the entire construction process, with a collision detection accuracy of ≥98%; 2) Sensor data is connected to the city's CIM platform to realize full life cycle management of drainage wells.

[0034] The drainage well adopts modular construction: 1) Prefabricated well shafts are produced in a standardized factory (error ≤ ±2mm), and the on-site assembly time is ≤ 4h; 2) The self-compacting foam concrete reaches a strength of 8MPa in 3h, realizing "excavation on the same day, backfilling on the same day, and opening to traffic the next day".

[0035] The drainage well can be equipped with an intelligent monitoring system: 1) fiber optic sensors are pre-embedded in the well shaft to monitor leakage and settlement data in real time; 2) the data is transmitted to the municipal maintenance platform via NB-IoT, and the abnormal early warning response time is ≤30min.

[0036] The drainage well construction process provided in this implementation plan includes the following steps:

[0037] 1. Demolition of old wells and foundation treatment

[0038] Step 1: Close off the work area

[0039] Set up barriers (1.8m high), occupying ≤2.5m of lane width, and maintain one-way traffic;

[0040] Install a dust suppression spray system (water mist particle size ≤ 50μm) to control dust concentration < 1.0mg / m³.

[0041] Step 2: Crushing the old well body

[0042] Hydraulic picks are used to break up well walls, producing fragments with a particle size ≤100mm, which are then loaded onto trucks for removal.

[0043] High-pressure water jet (pressure 30MPa, flow rate 60L / min) was used to clean the residual structure and expose the complete pipe opening.

[0044] Step 3: Foundation Strengthening

[0045] Drilled anchor bolts (Φ50mm, depth 1.5m) and inject ultrafine cement grout (water-cement ratio 0.38:1).

[0046] Grouting pressure 0.6MPa, grouting volume per hole ≥50L, pull-out resistance ≥100kN after 24h curing.

[0047] 2. Modular wellbore installation

[0048] Step 4: Base Positioning

[0049] Hoist the prefabricated base and calibrate it with a laser level (error ≤ 2mm / m);

[0050] The anchor bolt is welded to the base, with a weld height of ≥6mm, and ultrasonic testing shows no porosity.

[0051] Step 5: Wellbore Assembly

[0052] The lower section of the well shaft is connected to the existing pipeline via a socket joint. After the rubber ring is installed, the gap is filled with MS adhesive (dosage 0.8 kg / m).

[0053] Tighten the upper section wellbore flange bolts (torque 45 N·m), and apply epoxy interface agent to the joint (bonding strength ≥ 2.5 MPa).

[0054] 3. Backfilling and sealing

[0055] Step 6: Lightweight concrete backfilling

[0056] Layered pouring of foamed concrete (wet density 950kg / m³), each layer ≤300mm thick, compacted using an immersion vibrator (frequency 50Hz);

[0057] Simultaneous injection of ultrafine cement slurry (water-cement ratio 0.8:1) with a filling rate ≥95%.

[0058] Step 7: Construction of dynamic waterproof layer

[0059] Rubber asphalt composite layer (5mm thick) hot melt paving (temperature 180±5℃), overlap width ≥100mm;

[0060] Airless spraying of polyurea coating (pressure 20MPa), thickness 2mm, surface drying time ≤30min.

[0061] 4. Functional verification and commissioning

[0062] Step 8: Water tightness test

[0063] Inject water to 2 / 3 of the well depth (water level 3.2m), and the leakage rate in 24 hours should be ≤2L / m².

[0064] Leakage rate was monitored using an electronic flow meter (accuracy ±0.5%).

[0065] Step 9: Load Test

[0066] A 10t axle-loaded vehicle rolls over the well 100,000 times at a speed of 10km / h, and the settlement around the well is ≤1mm (measured by a laser displacement sensor).

[0067] After the manhole cover is installed, the opening force is tested to be ≤150N (torque wrench test).

[0068] The specific embodiments of this utility model are written in a progressive manner, emphasizing the differences between each implementation scheme, and the similar parts can be referred to each other.

[0069] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A drainage well reinforcement structure, characterized in that, The drainage well body adopts a prefabricated assembled well cylinder structure, which is composed of an upper well chamber (1) and a lower well chamber (2) connected and assembled. The upper well chamber (1) is provided with a well cover (3) at the top opening, and the lower well chamber (2) is provided with sockets (4) on both sides of the side walls. The sockets (4) are connected to the drainage pipe (5), and the lower end of the lower well chamber (2) is provided with an anti-settlement base (6).

2. The drainage well reinforcement structure according to claim 1, characterized in that, A flexible transition layer (7) is provided on the outer periphery of the top opening of the upper section well chamber (1). The flexible transition layer (7) is distributed in a ring on the outer periphery of the top opening. The flexible transition layer (7) includes a rubber asphalt composite layer and a polyurea waterproof coating layer from top to bottom. The flexible transition layer (7) extends into the road structure layer.

3. The drainage well reinforcement structure according to claim 1, characterized in that, The upper well chamber (1) and the lower well chamber (2) are assembled by connecting them through a flange structure (8), and the joint is coated with an epoxy interface layer.

4. The drainage well reinforcement structure according to claim 1, characterized in that, The prefabricated assembled well shaft is a fiber-reinforced polymer concrete structure.

5. The drainage well reinforcement structure according to claim 1, characterized in that, The prefabricated assembled well casing has circumferential stiffening ribs on its outer wall.

6. The drainage well reinforcement structure according to claim 1, characterized in that, The anti-settlement base (6) is composed of a double-layer steel plate on the outside and a C40 micro-expansion concrete layer in the middle. The diameter of the anti-settlement base (6) is larger than the outer diameter of the bottom of the prefabricated assembled well shaft; The anti-settlement base (6) is provided with an anchoring system, which includes multiple anchor rods (51). The multiple anchor rods (51) are radially distributed on the outer circumference of the anti-settlement base, and the multiple anchor rods pass through the anti-settlement base and the foundation in sequence.

7. The drainage well reinforcement structure according to claim 1, characterized in that, The socket (4) and the drain pipe (5) are provided with a buffer pad (41) and a waterproof layer. The buffer pad is placed adjacent to the drain pipe (5) and extends to the outside of the well. The buffer pad (41) and the drain pipe outside the well are fixed by a clamp. The waterproof layer is disposed in the gap between the socket and the buffer pad. The waterproof layer includes a rubber ring (42) and a sealant (43). The sealant (43) is filled between the rubber ring (42) and the buffer pad (41).

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