» Blog » Mechanical Spiral Winding Method Pipeline Trenchless Repair

Mechanical Spiral Winding Method Pipeline Trenchless Repair

January 25, 2022

Pipeline trenchless repair, mechanical spiral winding repair, Jiangsu Nanpai pipeline trenchless mechanical spiral winding repair, on-site construction. Make pipeline defects invisible, check pipeline ruptures, deformations, dislocations, collapses, and cracks. The optical focusing function is better, and the built-in light source of the lens is strong enough to observe the inside of the pipe. Excavation-free repair for environmental protection dredging detection of pipe network management.
The application of trenchless repair of urban municipal pipelines for rupture, deformation and dislocation of pipeline defects, and the rupture, leakage and deformation of underground pipes during use (among them, the trenchless repair technology for drainage pipes is more and more applied in repairing pipeline defects. Many,…dislocation (≤15%D), leakage, corrosion and other defects are repaired; 10 structural defects of the pipeline: rupture, deformation, corrosion, misalignment, undulation…internal blockage, collapse, illegal insertion of the pipeline , dislocation, cracks and other defects…During the process of trenchless repair of drainage pipes

Technical process of mechanical spiral winding method

Construction steps: open the inspection well for ventilation, dredging, interception (diversion), excavation of the working pit, threading of the pipe, sealing of the stable pipe, grouting, restoration of the working pit, removal of the interception weir, and water flow.
Technical Features
Spiral winding technology has the advantages of acid and alkali resistance, corrosion resistance, light weight, convenient construction, good sealing performance, no leakage, etc., and is suitable for trenchless repair of drainage pipes.
Drainage pipeline characteristics determine the choice of repair technology
(1) The structural strength of the early drainage pipes is generally poor;
(2) There are manholes on the pipeline, and the diameter is generally about 650 mm;
(3) The interval between two manholes on the pipeline is generally within 80 meters;
(4) The pipeline is buried much deeper than the pressure pipeline (15 meters);
(5) It is difficult to treat the inner surface of the pipe to a dry level;
(6) There are many branch pipes.
It should also be noted that with the widening of urban roads, the drainage pipes are mostly located on the main roads and buried deep. The excavation of the drainage pipeline will bring great hidden dangers to other pressure or power lines above the drainage pipeline. With the existence of the above pipelines, sometimes there may be no conditions for excavation at all.
Compared with the 20mm heat curing, the strength of the spiral winding technology (steel-plastic reinforced) lining pipe is 12.42 times, and compared with the 10mm thick light curing, the strength is 26.45 times. In the strength composition of the helically wound lined pipe, the steel strip plays a great role. Therefore, when the original pipe is seriously damaged and the new pipe needs to have high self-strength, the steel-plastic reinforced spiral winding technology should be considered first.
At present, there are four technologies of spiral winding trenchless repair technology: SPR, SPR-EX, SPR-ST, and SPR-PE, which will also be updated and introduced in future tweets;
The large-scale collapse and deformation of the pipeline is the biggest difficulty of this project, and it is also the focus of the follow-up construction;
Mechanical spiral winding repair, urban drainage pipe mechanical spiral winding repair is a kind of winding type that uses a spiral winding machine to make the resin-impregnated winding or tape in a spiral direction when the reinforced plastic is wound and formed. The core mold rotates at a uniform speed , the winding head reciprocates along the axis of the mandrel at a certain speed. Adjusting the speed ratio can complete different regular winding shapes. Once the process conditions are met, the spiral winding angle should be as small as possible, which will help the product to withstand axial stress. This method is suitable for the manufacture of cylindrical and spherical products, such as Pressure vessels such as gas tanks and corrosion-resistant pipes.

Mechanical spiral winding repair principle of urban drainage pipes

Use strips of reinforced PVC with interlocking edges (see also PE material coverage) to form a new tube in situ. During construction, the spiral winding machine directly enters the pipeline at the bottom of the well or the construction personnel, and winds the strips made of plastic materials such as PVC into the shape of the pipeline, and then can be grouted in the annular gap between the winding pipe and the old pipe to be consolidated. .

Mechanical spiral winding repair process

Construction steps: open the inspection well for ventilation, dredging, interception (diversion), excavation of the working pit, threading of the pipe, sealing of the stable pipe, grouting, restoration of the working pit, removal of the interception weir, and water flow.
Technical features: Spiral winding technology has the advantages of acid and alkali resistance, corrosion resistance, light weight, convenient construction, good sealing performance, no leakage, etc. It is suitable for trenchless repair of drainage pipes.
The characteristics of the drainage pipeline determine the choice of repair technology: (1) the structural strength of the early drainage pipeline is generally poor; (2) there are manholes on the pipeline, and the diameter is generally about 650 mm; 3) the interval between the two manholes on the pipeline is generally within 80 meters; ( 4) The pipeline is buried much deeper than the pressure pipeline (15 meters); (5) It is difficult to treat the inner surface of the pipe to achieve a dry degree; (6) There are many branch pipes.
It should also be seen that with the widening of urban roads, the drainage pipes are mostly located on the main roads and buried deep. The excavation of the drainage pipeline will bring great hidden dangers to other pressure or power lines above the drainage pipeline. With the existence of the above pipelines, sometimes the conditions for excavation may not be available at all.
Compared with the 20mm heat curing, the strength of the inner lining pipe is 12.42 times higher than that of the 20mm thermal curing, and the strength is 26.45 times higher than that of the 10mm thick light curing. . In the strength composition of the spirally wound lined pipe, the steel strip plays a great role. Therefore, when the original pipe is seriously damaged and the new pipe needs to have a high self-strength, the steel-plastic reinforced spiral winding technology should be considered first. The above points should be the basis for our judgment or the pursuit of goals when we choose the drainage pipeline repair technology.

Mechanical spiral winding repair characteristics

(1) After the repair of the HDPE lining of the pipeline, the steel and plastic are closely fitted, with high joint pressure bearing capacity and strong overall performance of the pipeline, which can fully meet the design requirements of the newly laid pipeline.
(2) Non-excavation repair, underground crossing, one-time repair distance is long (up to 1000 meters), avoiding the damage to the ground environment caused by traditional repair techniques.

Maybe you like also

  • ABOUT US

    Wuhan Yichao Technology Equipment Co., Ltd. is a professional supplier of horizontal directional drilling rigs. We are XCMG authorized distributor and has nearly 10 years of trenchless pipeline experience.

  • CONTACT US

    Email: m13517277987@163.com

    Tel: 0086-18162684887

    Wechat/WhatsApp: 0086-18162684887/0086-13517277987

    Skype: myfotma