English Translation The construction of plastic blind ditch pipes shall abide by the principle of “combining prevention, drainage, interception and blocking, adjusting measures to local conditions and implementing comprehensive treatment”, so as to realize reliable drainage and economical rationality. Construction Procedures In typical tunnel construction, boreholes are drilled for positioning of drainage blind pipes with a spacing ranging from 30 cm to 50 cm. Expansion anchor bolts are driven into the positioning holes or steel bar ends are pre-embedded with anchoring adhesive to fix both ends of blind pipes. The blind pipes are wrapped with non-woven geotextile and bound with binding wires, then fastened onto expansion bolts with clips. Tee joints are adopted to connect circumferential permeable pipes, longitudinal corrugated pipes and side-wall drainage holes. For road and similar projects, longitudinal blind ditches are generally buried parallel to both sides of carriageways, 1 m to 2 m away from retaining walls. Their burial depth shall guarantee the apex of groundwater drawdown curve sits a certain depth below pavement surface. To effectively lower water level, transverse blind ditches are arranged every 20–30 m and connected to longitudinal blind ditches at a gradient of 1% to 1.5%. In addition, patented cold-resistant and anti-freezing drainage blind pipes for tunnels have been developed. By arranging external thermal insulation layers and internal ventilating heating structures, such new products adapt to severe working conditions and enhance the service adaptability and long-term operational stability under low-temperature environments. Key Maintenance Requirements At waste residue yards and similar sites, blind pipes and their outlets may lose efficacy due to slope collapse or sediment silting, which requires timely cleaning and remediation.
Post time: Jun-02-2026