With the development of urbanization construction in China, the pressure of urban road traffic increases, and the potential cost of repairing underground pipelines by road excavation technology is increasing. More local management units began to use the UV-light trenchless in-situ repair process to repaire underground drainage pipes. With the development of technology and the improvement of construction level, the demand for large pipe diameter and one-time long-distance repair is also increasing. Long-distance repair not only speeds up the repair project, but also reduces the carbon emissions of construction, which is environmentally friendly and efficient. UVLINER? UV-curable hose material of Youwei New material has stable curing quality, uniform thickness and reliable performance. In 2021, there have been a number of restoration cases of large pipe diameter and long distance. Today, Xiaoyou selected three representative construction cases to give you a detailed introduction.
A Case Sharing
Construction pipe diameter：DN 1000
Construction length：106.2 m、143.7 m
Materials used：UVLINER? DN1000
Hose thickness：10mm
Construction address: Deyang City, Sichuan Province Construction time: May 2021
Deyang City, Sichuan Province is located in the western Sichuan region, the annual rainfall is 1300 mm.The rainfall in the summer accounted for 80% of the annual rainfall, which means that in the summer months, the city's underground pipeline will shoulder the most heavy drainage tasks throughout the year. So before this, it is extremely necessary to maintain and repair the pipeline well.
1. The pipeline has a large amount of silting, and a large amount of water in the upstream of the pipeline.
2. Due to the long time, the well chamber brick caused water leakage.
3. The length of the pipeline to be repaired is long, and there are multiple underground wells located in residential shops. This makes it extremely difficult to dredge the pipeline.
4. In busy urban areas, due to tight construction schedules, it is necessary to complete high difficulty construction in a short period of time.
Complete long distance pipeline repair in a short time
The underground well is located in the residential shops, and it is very difficult to remove silt from the pipeline
Construction environment drawing
(Authorized by Youwei New material customers only to use in this public number, readers please do not reprint)
B Case Sharing
Construction pipe diameter：DN 1000
Construction length：102 m、104 m
Materials used：UVLINER? DN1000
Hose thickness：10mm
Construction address: Pizhou, Jiangsu Province
Construction time: July 2021
DN1000 large pipe diameter long distance construction
02 Construction Situation
1. Well chamber is located in the green belt, which makes the construction more difficult.
2. Pipeline desilting work is still the focus of the pipeline before repair.
During the construction process, the construction period is tight, the cutting time is long, and uncontrollable weather factors will affect the progress of the construction. Due to the particularity of the UV-curable hose material can not touch the water, even if there is a protective film, it is inevitable that there will be a contingency. In the case of temporary heavy rain, the construction site urgently made waterproof treatment. Tents were set up at the discharging wellhead to ensure that the material will not directly encounter water, and water plugging treatment is performed in each well at the same time.
Construction environment drawing
(Authorized by Youwei New material customers only to use in this public number, readers please do not reprint)
C Case Sharing
Construction pipe diameter：DN1200
Construction length：179 m
Materials used：UVLINER? DN1200
Construction address: Nansha District, Guangzhou
Construction time: May 2021
DN1200 large pipe diameter long distance construction
DN1200 large pipe diameter one-time restoration 179 meters, from day to night, we together to witness an industry construction miracle!
Construction environment drawing
(Authorized by Youwei New material customers only to use in this public number, readers please do not reprint)
A rendering of the restoration
Long distance construction key summary:
1. If the construction is in downtown, main road, viaduct intersection, bus station and other places, the traffic flow is large, the construction time is short and the well is deep, and the cutting difficulty is increased, so the construction needs to be completed in a short time and the quality is the main difficulty.
2. Due to the deviation of the wellbore and the small size of the wellhead, it is necessary to manually guide and straighten the material during cutting to avoid material distortion and wrinkles.
3. Soft and hard suitable materials are necessary to meet the construction difficulties of large pipe diameters.
4. When defects such as rupture, leakage and disconnection were found in the pipeline desilting test, the pipeline was pretreated in the early stage and accompanied by quicksand flooding into the pipe, a variety of point repair processes were adopted (local high-pressure grouting method, local glass fiber epoxy resin point repair method, etc.).
5. long distance pipeline repair time is longer, the need for uninterrupted operation, difficult to pre-control the weather, in the middle of the rainstorm at the same time to do emergency waterproof treatment protection materials.
6. the work of the pipeline dredging is an important step in the normal repair of the pipeline in the later stage.
Special thanks: Thanks for the support and authorization of the construction party
If you have similar construction difficulties in the project under construction, if you want to know more about the on-site use of our materials, please contact our technical hotline: 13208000072
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