A method for preventing leakage at concrete drainage pipe connection joints

Abstract

This invention discloses a method for preventing leakage at concrete drainage pipe connection interfaces, belonging to the field of drainage network treatment technology. This method uses DN800 as the pipe diameter boundary and employs a triple anti-seepage system of V-shaped nitrile rubber rings, expanding waterproof mortar, and C20 anti-seepage concrete. The interface construction is completed through ten standardized steps: interface pretreatment, sealing installation, inner anti-seepage, outer formwork pouring, foundation construction, curing, backfilling, self-inspection, and acceptance archiving. Pipe foundations are set up according to the differences in municipal / residential scenarios, and the anti-seepage work area and sealing size are determined according to pipe diameter, with strict curing and backfilling control. This invention solves the problems of poor sealing compatibility, missing procedures, insufficient curing, and easy leakage and cracking in traditional concrete pipe interfaces. It has the advantages of high standardization, long-lasting anti-seepage effect, strong scenario adaptability, convenient construction, and controllable quality, and is suitable for anti-seepage construction of concrete drainage pipe interfaces in municipal and residential areas.

Description

Technical Field

[0001] This invention relates to the field of drainage pipe network treatment technology, specifically to a method for preventing leakage at concrete drainage pipe connection interfaces. Background Technology

[0002] Concrete drainage pipes are a core component of urban drainage systems. Joint leakage is one of the most significant defects in the pipe network, easily leading to problems such as road subsidence, groundwater backflow, sewage overflow, and pipe network damage. Traditional joint construction methods have obvious drawbacks: 1. The sealing materials are limited and not selected according to pipe diameter, resulting in poor compatibility; 2. Key processes such as interface pretreatment and waterproofing reinforcement are missing; 3. The outside of the interface was not encased in waterproof concrete, resulting in weak impermeability; 4. There is no standardized construction process, and no unified basis for quality control; 5. Inadequate maintenance of the interface can easily lead to cracking and leakage in the early stages.

[0003] Existing technologies lack a set of concrete drainage pipe interface anti-leakage construction methods that are adaptable to municipal and residential areas, controllable throughout the entire process, and replicable and scalable. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a standardized, replicable, and long-lasting anti-seepage construction method for concrete drainage pipe connection interfaces. This method solves problems such as non-standard interface treatment, poor sealing compatibility, missing procedures, uncontrollable quality, and easy leakage and cracking, thereby improving the operational stability and service life of the pipeline network.

[0005] The technical solution of this invention is as follows: A method for preventing leakage at the connection interface of a concrete drainage pipe, comprising ten standard procedures: 1. Interface preprocessing; 2. Rubber ring sealing installation; 3. Inner side of the interface is waterproofed; 4. Waterproof formwork on the outside of the interface; 5. Pouring of impermeable concrete; 6. Coordinated construction of pipeline foundations; 7. Interface maintenance; 8. Trench backfill control; 9. Quality self-inspection; 10. Acceptance and filing.

[0006] This invention uses DN800 as the pipe diameter boundary and sets the anti-seepage operation width and encapsulation thickness in stages; it adopts a triple anti-seepage system of V-shaped nitrile rubber ring, expanding waterproof mortar, and anti-seepage concrete; it sets up the pipeline foundation according to the differences between municipal and residential areas, and achieves full-process quality control through strict maintenance, backfilling, and self-inspection.

[0007] After adopting the above technical solution, the anti-leakage construction method for concrete drainage pipe connection interfaces of the present invention has the following advantages: 1. Triple seepage prevention system: Rubber ring + waterproof mortar + seepage-proof concrete for full-dimensional sealing and long-lasting seepage prevention effect.

[0008] 2. Pipe diameter classification and matching: With DN800 as the boundary, the parameters are precisely matched and the sealing fit is high.

[0009] 3. Scenario-based construction: Corresponding foundation types are adopted for municipal and residential areas, which has strong applicability.

[0010] 4. Ten-step standardized process: clear procedures, replicable, easy to explain, and easy to supervise.

[0011] 5. Enhanced curing and backfilling control: Reduces early cracking and improves the long-term reliability of the joint.

[0012] 6. Simple construction: No special equipment is required, workers can easily master the skills, and it is suitable for large-scale promotion. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the anti-leakage structure of the concrete drainage pipe interface according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the anti-seepage encapsulation of pipe joints below DN800 according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the anti-seepage encapsulation of DN800 and above pipe joints according to an embodiment of the present invention. The components include: 1. Rubber ring, 2. Socket, 3. Spiral, 4. Triangular mortar, 5. Formwork support, and 6. Concrete foundation. Detailed Implementation

[0014] Implementation 1 The present invention will now be described in further detail.

[0015] Please see now Figures 1-3 Step 1: Interface preprocessing Mechanically roughen the three ends of the concrete pipe spigot to remove slag, dust, and oil, and keep the joint dry; divide the seepage prevention operation area according to the pipe diameter: 30cm for DN800 and above, and 20cm for DN800 and below.

[0016] Step 2: Rubber ring sealing installation Select V-type nitrile rubber ring 1 (50 grade IRHD) and match the specifications according to the pipe diameter; evenly fit it into the groove of the socket to ensure that there is no twisting or loosening, and connect the pipe in place.

[0017] Step 3: Inner side waterproofing treatment of socket 2 Use 42.5MPa cement and M10 expanding waterproof mortar to fill the joint gaps, and apply triangular mortar 4 to ensure a smooth surface without hollow areas or cracks.

[0018] Step 4: Install formwork on the outside of the interface for waterproofing. Formwork should be installed according to pipe diameter: DN≥800mm: encapsulation thickness≥30cm; DN<800mm: encapsulation thickness≥20cm; width on each side of the axial direction ≥30cm.

[0019] Step 5: Pouring the impermeable concrete Pour C20 impermeable concrete, vibrate it to ensure it is compacted, and make sure it is firmly bonded to the outer wall of the pipe. Smooth the surface, and make sure there are no cold joints or honeycomb pits.

[0020] Step 6: Coordinated Construction of Pipeline Foundation Municipal roads use 120° or 180° concrete foundations; residential areas use crushed stone or medium-coarse sand foundations; the foundation bearing capacity is ≥100kPa.

[0021] Step 7: Interface Maintenance The interface should be covered and kept moist for no less than 7 days. During the curing period, it should not be disturbed or crushed. Backfilling can only be carried out after the design strength is reached.

[0022] Step 8: Trench backfill control Within 50cm of the top of the pipe, medium-coarse sand or gravel should be used for backfilling, with a compaction degree of ≥95%; above the top of the pipe, backfilling and compaction should be carried out in layers according to road design standards.

[0023] Step 9: Quality Self-Inspection Check the appearance for cracks and hollow areas, and ensure the dimensions meet requirements; conduct a water tightness test to ensure there is no leakage.

[0024] Step 10: Acceptance and Archiving Construction photos, test reports, and process records should be retained as required, and acceptance and document archiving should be completed.

[0025] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of this invention and are defined by the claims.

Claims

1. A method for preventing leakage at concrete drainage pipe connection joints, characterized in that, Includes the following steps: Step 1: Interface preprocessing; Step 2: Install the rubber ring seal; Step 3: Inner side waterproofing treatment of the interface; Step 4: Formwork for waterproofing the outside of the interface; Step 5: Pouring the impermeable concrete; Step 6: Coordinated construction of pipeline foundations; Step 7: Interface maintenance; Step 8: Trench backfill control; Step 9: Quality self-inspection; Step 10: Acceptance and filing.

2. The method for preventing leakage at concrete drainage pipe connection interfaces according to claim 1, characterized in that, Step 1, interface pretreatment, specifically involves: mechanically roughening the end face of the socket to remove scum, dust, and oil, and keeping it dry; dividing the anti-seepage operation area according to the pipe diameter: 30cm for DN800 and above, and 20cm for DN800 and below.

3. The method for preventing leakage at the connection interface of concrete drainage pipes according to claim 1, characterized in that, Step 2: Rubber ring sealing installation. Use V-type nitrile rubber rings (50 grade IRHD), match the pipe diameter specifications, and evenly fit them into the socket groove, ensuring no twisting or looseness, and that the socket is properly connected.

4. The method for preventing leakage at concrete drainage pipe connection interfaces according to claim 1, characterized in that, Step 3: For the seepage prevention treatment on the inside of the interface, 42.5MPa cement + M10 expanding waterproof mortar is used to fill the gaps and apply triangular mortar. The surface is smooth and free of hollow cracks.

5. The method for preventing leakage at concrete drainage pipe connection interfaces according to claim 1, characterized in that, Step 4: Determine the sealing thickness of the outer anti-seepage formwork according to the pipe diameter: DN≥800mm sealing thickness≥30cm; DN<800mm sealing thickness≥20cm; width on each side in the axial direction≥30cm.

6. The method for preventing leakage at concrete drainage pipe connection interfaces according to claim 1, characterized in that, Step 5: Pour C20 impermeable concrete, vibrate it to ensure it is compacted, firmly bonded to the outer wall of the pipe, and the surface is smoothed without cold joints.

7. The method for preventing leakage at concrete drainage pipe connection interfaces according to claim 1, characterized in that, Step 6: Collaborative construction of pipeline foundations is differentiated according to the scenario: municipal roads use 120° / 180° concrete foundations; residential areas use crushed stone / medium-coarse sand foundations; foundation bearing capacity ≥100kPa.

8. The method for preventing leakage at the connection interface of concrete drainage pipes according to claim 1, characterized in that, Step 7: The interface should be covered and kept moist for ≥7 days. During the curing period, it should not be disturbed or crushed. Backfilling can only be carried out after the design strength is reached.

9. The method for preventing leakage at the connection interface of concrete drainage pipes according to claim 1, characterized in that, Step 8: Trench backfilling: Use medium-coarse sand / gravel for backfilling within 50cm of the top of the pipe, with a compaction degree ≥95%; backfill in layers according to road standards above the top of the pipe.

10. The method for preventing leakage at the connection interface of concrete drainage pipes according to claim 1, characterized in that, Step 9: Quality self-inspection includes ensuring the appearance is free of cracks and hollow areas, that the dimensions meet design requirements, and that there is no leakage during the water tightness test; Step 10: Complete the retention and archiving of images, inspection reports, and process records.

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