Trenchless integrative repair method for concrete drainage pipeline with cracking, corrosion and subsidence

{
  "publication_number": "US11473713B2",
  "country": "US",
  "kind": "B2",
  "title": "Trenchless integrative repair method for concrete drainage pipeline with cracking, corrosion and subsidence",
  "abstract": "A trenchless integrative repair method includes steps of: S1, pre-casting steel rings according to an internal diameter of a defect pipeline, and forming grouting holes in the steel rings; S2, loading the steel rings to a defect position inside the pipeline, and fitting the steel rings to an internal wall of the pipeline to form reinforcing rings; S3, selecting a number of the grouting holes according to subsidence distribution; drilling a hole in the pipeline to reach a subsidence position and inserting a grouting pipe; steadily grouting the subsidence position with a polymer grouting system, and observing a lift condition of the pipeline; removing the grouting pipe after the pipeline is lifted to a predetermined level; and S4, pulling a lining pipe into the pipeline, and fitting the lining pipe to the steel rings and pipeline walls adjacent to the steel rings; curing the lining pipe.",
  "claims": [
    "1. A trenchless integrative repair method for concrete drainage pipelines with various defects, wherein the defects comprise subsidence; the trenchless integrative repair method comprises steps of: S1, prefabricating steel rings according to an internal diameter of a defective pipeline, and forming grouting holes in the steel rings; S2, inserting the steel rings into the defective pipeline, and positioning the steel rings against an internal wall of the defective pipeline to form reinforcing rings; S3, drilling holes in the defective pipeline to a subsidence position, so as to cooperate with the grouting holes; and inserting a grouting pipe; grouting the subsidence position with a polymer grouting system, and observing lifting of the defective pipeline; removing the grouting pipe after the defective pipeline is lifted to a predetermined level; and S4, pulling a lining pipe into the defective pipeline, and positioning the lining pipe within the steel rings and extending to a portion of the internal wall of the defective pipeline adjacent to the steel rings; solidifying the lining pipe to wrap the steel rings.",
    "2. The trenchless integrative repair method, as recited in claim 1, wherein the step S2 also comprises placing an airbag into an outlet of an upstream pipe from an inspection well before inserting the steel rings into the defective pipeline; inflating the airbag with an air compressor and an inflation valve to block upstream water flow to permit workers to enter from the inspection well and reach the subsidence position.",
    "3. The trenchless integrative repair method, as recited in claim 2, further comprising a step S5: cutting away an excess portion of the lining pipe, removing the airbag, and recovering any remaining repair equipment.",
    "4. The trenchless integrative repair method, as recited in claim 1, wherein in the step S2, the inserted steel rings are assembled together end to end along an axis direction of the defective pipeline, and a total length of the assembled steel rings is determined according to actual distribution of the defects on-site.",
    "5. The trenchless integrative repair method, as recited in claim 4, wherein in the step S2, at least one of the formed grouting holes is positioned toward a bottom of the defective pipeline when inserting the steel rings.",
    "6. The trenchless integrative repair method, as recited in claim 5, wherein each of the steel rings is provided with screw connection holes in advance, and adjacent steel rings are assembled and connected through fixing screws, connection gaskets and the screw connection holes.",
    "7. The trenchless integrative repair method, as recited in claim 6, wherein the fixing screws of the adjacent steel rings are not fully fastened in the step S2, and the fixing screws are fully fastened after finishing the step S3.",
    "8. The trenchless integrative repair method, as recited in claim 1, wherein in the step S4, by using a pulley block fixed to a well wall and a traction wire installed on the pulley block, an ultraviolet lamp is moved inside the lining pipe for solidifying the lining pipe."
  ],
  "description_excerpt": "The present invention relates to the technical field of pipeline repairing, and more particularly to a trenchless integrative repair method for concrete drainage pipeline with cracking, corrosion and subsidence.\n\nAs the “underground artery” of modern cities, the urban underground pipeline networks bear the responsibilities of sewage and drainage and they play an important role in the daily lives of urban residents. With the acceleration of China's urbanization process, the construction scale of the urban underground pipeline networks increases. By 2016, the total length of China's water supply, gas, drainage, and heat pipelines had exceeded 2.12 million kilometers. With the service life continuous to increase, the pipelines will gradually aging and out of repair, and thus suffer with the coexisted engineering defects of cracking, corrosion and subsidence. If these defects cannot be timely cured, they will cause the ground to crack and collapse and environmental pollution, which will seriously threaten residents' travel and safety of nearby constructions. Therefore, repairing the subsidence of underground pipelines and restoring the functions thereof play an important role in ensuring the normal life as well as the safety of life and property of people along the pipelines.\n\nThere are two repairing methods for pipeline disconnection. The first is the excavation repairing method, with which the pipeline defects can be cured completely.",
  "cpc": [
    "F16L 55/163",
    "E03F 2003/065",
    "F16L 55/134",
    "F16L 55/162",
    "F16L 55/16455",
    "F16L 55/1654",
    "F16L 9/085"
  ],
  "ipc": [
    "F16L 9/08",
    "F16L 55/134",
    "F16L 55/163",
    "F16L 55/165",
    "F16L 55/1645"
  ],
  "assignees": [
    "Infrastructure Renewal Institute Of Southern China",
    "Welead Infrastructure Engineering Technology Zhengzhou Ltd"
  ],
  "inventors": [
    "Fuming Wang",
    "Hongyuan Fang",
    "Peng Zhao",
    "Yanhui Pan",
    "Bin Li",
    "Hang HE"
  ],
  "filing_date": "2020-04-27",
  "publication_date": "2022-10-18",
  "grant_date": "2022-10-18",
  "priority_date": "2019-09-25",
  "application_number": "US-202016858731-A",
  "family_id": "68973967",
  "cited_by_count": 1,
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}