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UV-CIPP Repair for Partially Collapsed Pipeline Without Soil Cover Using

China UV-CIPP Repair for Partially Collapsed Pipeline Without Soil Cover Using

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UV-CIPP Repair for Partially Collapsed Pipeline Without Soil Cover Using

MOQ： 1 set
Price： Variable
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Payment Terms	T/T
Packaging Details	Normal
Delivery Time	10 working days
Supply Ability	100 sets per year
Model Number	D9
Place of Origin	China
Certification	ISO
Brand Name	CIPPTECH

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Product Specification


Payment Terms	T/T	Packaging Details	Normal
Delivery Time	10 working days	Supply Ability	100 sets per year
Model Number	D9	Place of Origin	China
Certification	ISO	Brand Name	CIPPTECH
High Light	Partially Collapsed Pipeline Repair UV-CIPP Repair ，Without Soil Cover Trenchless Pipeline Repair ，Temporary External Constraint No-Dig Pipeline Rehabilitation

Special Construction Plan for UV-CIPP Repair of Partially Collapsed Pipeline (Without Soil Cover)

Project Overview and Special Condition Analysis

Based on site inspection and evaluation, a severe structural defect exists in the underground pipeline section extending approximately 5 meters from the inspection well: the upper part of the pipeline has completely collapsed, leaving no original soil cover.

Conventional UV-CIPP repair requires the original pipeline to have a certain structure to support the liner. Under the current extreme condition of "no pipe crown, no soil cover," if standard pressure is directly applied for inflation, the liner will over-expand in the unconstrained collapsed area, leading to wall thinning or even bursting, failing to form properly. Therefore, specific special construction techniques must be adopted.

Core Strategy and Process Innovation

To solve the above challenges, this plan adopts an innovative combined process of "Temporary External Constraint + Stepped Air Pressure and Coordinated Backfilling":

Full Wrapping with Safety Caps

Customize and use safety caps over 5 meters long to sheath the exposed UV-CIPP liner, artificially creating a high-strength "temporary physical pipe shell" to restrict the infinite radial expansion of the liner and shape the initial pipe form.

Dynamic Pressure Control and Coordinated Backfilling

Abandoning the traditional "one-time full inflation" process, a dynamic coordinated operation of "Micro-pressure inflation → Initial backfilling → Stepped pressure increase → Deep backfilling" is adopted. The backfill soil is used in stages to provide the ultimate external mechanical support for the liner.

Detailed Construction Steps

Pre-construction Preparation and Site Clearance

Ensuring deep trench fall prevention and safety protection for personnel, clear debris, sludge, stagnant water, and sharp objects in the collapsed area. Keep the trench bottom flat to prevent scratching the UV-CIPP bottom foil during the pulling and inflation process.

Pulling the Bottom Foil and Liner

Lay the sliding bottom foil from the inspection well according to standard procedures, and then use a winch to slowly pull the UV-CIPP liner into the pipe, ensuring it smoothly passes through the >5-meter collapsed and exposed area.

Installing Extended Safety Caps

In the 5-meter collapsed section, completely sleeve the prepared extended safety caps over the UV liner. Both ends of the safety caps must be effectively overlapped and tightly secured to the intact parts of the original pipeline, ensuring the entire liner in the uncovered area is strictly wrapped to form a continuous diameter constraint.

Stepped Pressurization and Coordinated Backfilling

This step is the absolute core of this plan, directly affecting whether the liner can be safely formed. It must be strictly executed simultaneously as follows:

Phase 1: Initial Micro-pressure Inflation

Start the blower and extremely slowly increase the pressure inside the liner, strictly controlling it between 0.1 - 0.2 Bar. The liner will bulge slightly, showing a basic pipe shape, but due to the minimal pressure, it will not break through the safety caps or deform excessively.

Phase 2: Initial Soil Backfilling

While maintaining the 0.1-0.2 Bar micro-pressure, backfill selected soil to the sides and top of the liner in the collapsed area. Backfilling must be done manually and gently; mechanical violent dumping is strictly prohibited. The soil should just cover the sidewalls of the liner, providing initial external support.

Phase 3: Slow Pressure Increase and Synchronized Backfilling

As the first batch of backfill soil provides external support, operators slowly increase the inflation pressure (gradually to 0.3-0.4 Bar or higher), while the construction team continues to pile up the backfill soil. Pressure elevation and soil backfilling are performed alternately and synchronously to maintain a dynamic balance between internal and external forces.

Phase 4: Reaching Working Pressure and Complete Backfilling

When the backfill soil reaches the design elevation above the pipe crown, sufficient to completely resist internal pressure, finally increase the pressure to the standard UV curing working pressure for that pipe diameter. Complete the final compaction of the soil under the balance of internal and external pressure.

UV Curing Operation

After confirming stable pressure and adequate external backfilling, insert the UV light train into the liner. Under standard working pressure, pull the light train at a constant speed calculated based on pipe diameter and wall thickness to perform the UV irradiation curing operation.

End Processing and Restoration

After curing, slowly depressurize, cut off the excess liner at both ends, and remove the safety cap residues at the pipe openings. Use special sealing materials to waterproof and seal the ends at the inspection wells, clean the site, and complete the overall repair project.

Quality Control and Safety Precautions

Pressure Monitoring

Dedicated personnel must monitor the pressure gauge throughout the inflation process, and highly sensitive safety relief valves must be equipped. Blindly increasing pressure before backfilling is in place is absolutely prohibited.

Strict Backfill Material Control

Backfill soil must be fine soil or medium-coarse sand. Sharp debris such as large stones, concrete blocks, and scrap rebar is strictly prohibited to prevent piercing the safety caps and liner.

Trench Work Safety

The trench in the collapsed area is deep. When backfilling and sleeving, deep excavation anti-collapse shoring must be implemented to ensure the safety of the operating personnel.

Company Details

Bronze Gleitlager

Bronze Sleeve Bushings

and

Graphite Plugged Bushings

from Quality China Factory

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Business Type:

Manufacturer,Exporter,Seller 
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Year Established:

2012 
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Total Annual:

40000000-45000000
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Employee Number:

150~200 
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Ecer Certification：

Verified Supplier 

Daoyunai Energy Saving Technology Limited has been committed to manufacturing trenchless CIPP UV cure systems with liners and CCTV inspection crawlers for underground pipelines to service customers all over the world. The product range covers four series and more than 20 models in ... Daoyunai Energy Saving Technology Limited has been committed to manufacturing trenchless CIPP UV cure systems with liners and CCTV inspection crawlers for underground pipelines to service customers all over the world. The product range covers four series and more than 20 models in ...

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Building 5, No. 1288, Kungang Highway, Songjiang district, Shanghai city 201616
https://www.cipp-uv.com/

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