The inversion-based integral rehabilitation method operates on the principle of resin curing through heat application. It involves inverting a fiber soft tube impregnated with thermosetting resin into the interior of the pipeline using hydraulic pressure, followed by filling the pipeline with water and heating it. This process enables the resin to cure inside the pipeline, forming a new structural lining.
CIPP Inversion Process Flow
CIPP Pneumatic Inversion Rehabilitation
Pneumatic Inversion Pipeline Rehabilitation Process involves using a fiber-reinforced soft tube impregnated with specialized repair resin. Employing dedicated pneumatic inversion equipment, the liner tube is inserted into the damaged pipeline and then inflated using air pressure to expand and tightly conform to the inner wall of the existing pipe. Under ambient temperature and pressure conditions, the polymerization curing time is precisely controlled to ensure the tube solidifies within the specified design period, forming a high-strength new lining inside the old pipeline.
CIPP UV Curing Integral Lining Rehabilitation
Ultraviolet (UV) Light Curing Integral Pipeline Rehabilitation Process involves utilizing the existing old pipeline as both the inner lining channel and forming mold for the new pipe. A glass fiber lining tube impregnated with resin is pulled into the target pipeline through a manhole using a winch system. After securing a specialized anchoring device (known as a "packer") at one end of the glass fiber tube, compressed air from the UV lining rehabilitation equipment is used to expand the tube until it tightly conforms to the inner wall of the host pipe. Subsequently, a UV light rack is inserted into the expanded tube to initiate drying and curing through controlled ultraviolet exposure.
Spiral Winding Method
The basic process of the spiral winding lining method involves using a pipe-coiling machine to wind PVC sheet strips or PE rigid strips into a tubular shape inside a manhole or pipeline, and then inserting this spiral tube into the old pipe. The advantages of the spiral lining method are as follows: its equipment is lightweight and enables fast construction speed; it has a wide range of applications, being suitable for the rehabilitation of not only circular pipes but also other irregularly shaped pipes such as elliptical, rectangular, and horseshoe-shaped ones; it has relatively low requirements for drainage within the old pipe, allowing for operations with a certain degree of water presence; it ensures stable quality due to the high integration level of the equipment; and it requires a small construction site area, with minimal impact on traffic.
FIPP pipeline rehabilitation tech
The overall rehabilitation process of the FIPP (formed-in-place pipe) thermoplastic forming method involves heating and softening a pre-fabricated lining pipe on specialized equipment, then pulling it into the interior of the existing pipeline. Subsequently, the interior of the lining pipe is heated and pressurized to restore its original diameter or expand it, ensuring tight adhesion to the original pipeline. Afterwards, ambient temperature gas or cold air is introduced to cool and solidify the lining pipe, ultimately forming a new inner lining layer, abbreviated as FIPP.
technological process
Micro-pipe jacking rehabilitation
Micro-pipe jacking refers to pipe jacking construction with a diameter of 600 mm or less. It is an upgraded version developed on the basis of traditional pipe jacking construction techniques, addressing the past challenge of being unable to perform pipe jacking for pipe diameters below 800 mm.
The compound pipe jacking process lies between the directional drilling method and the slurry balance method, representing a combined process integrating "construction technique + pipe + shaft." This process, when used in conjunction with self-sealing bell-and-spigot joint short pipes, transforms the traditional pipeline pullback operation into a pull-and-push process. Pipe sections are installed at the end shaft, with a drill rod threaded through the center of the pipeline to pull and push the pipeline from its tail end.
Micro-pipe jacking integral repair
Process Features:
1.The repaired pipeline can meet the requirements for the flow cross-section and structural reinforcement of drainage pipelines.2.The jacking speed is fast, enabling mobile construction and rapid withdrawal upon completion.3.The construction requires minimal land occupation: the manhole diameter is 0.7 m, and the well chamber dimensions are 1.2 m × 1.0 m.4.During repair, the process relies on the existing pipeline, with minimal alteration to the original pipeline's flow cross-sectional area and pipeline elevation.5.For this process, the pipe material cutting must be determined through strict on-site measurements, demanding high precision in preliminary surveys. Additionally, the jacking distance per segment should not exceed 100 meters.
Spot resin lining repair
Trenchless Local Lining Repair Method: This approach employs a felt-sleeve airbag local molding technique, where a resin-impregnated felt sleeve is pressed tightly against the host pipe using an airbag, followed by curing at room temperature or accelerated curing via UV light or other methods. Essentially, it adapts the in-situ curing process (typically used for full-pipe rehabilitation) for localized repairs. The resulting lining demonstrates significant structural strength and provides exceptional water-blocking performance for addressing pipeline leakage.
Stainless Steel Twin-Ring Repair
Stainless Steel Double-Expansion Ring Repair Technology is a trenchless localized sleeve-ring repair method for pipelines. The primary materials used in this technique are annular rubber waterproof sealing strips and stainless steel sleeves. During installation, a dual-expansion rubber ring assembly is positioned at pipeline joints or locally damaged sections, followed by securing with 2–3 stainless steel expansion rings to achieve effective water sealing.
Inspect and repair
The technology primarily employs chemical spray-applied materials to reinforce the structural strength of manhole walls and prevent leakage. Due to the excellent flexibility of the cured chemical materials, they can effectively mitigate damage caused by manhole settlement.
