Air Valve Chamber Construction

Construction Method of Air Valve Chamber for Ductile Iron Pipeline

Air valves play a critical role in water transmission systems. They are typically installed at high points along the pipeline to release trapped air, thereby ensuring smooth and efficient flow. This section outlines the step-by-step construction procedure of an air valve chamber for a Ductile Iron (DI) pipeline, supported by site practices and illustrative references.

1. Installation of All-Socket Tee

The first step involves the installation of an all-socket tee within the DI pipeline. A cut section of pipe is connected to the branch of the tee to facilitate the future installation of the air valve assembly.

For proper execution of subsequent civil works, a minimum clearance of 3 meters should be maintained on both sides from the centerline of the tee. This space is essential for shuttering, reinforcement placement, and other formwork activities.

After installation, the pipe invert level and alignment must be carefully checked to ensure compliance with design specifications. To maintain the correct position and prevent any displacement during construction, the tee section should be securely supported using heavy sheet piles or H-beams, anchored firmly with binding wire or suitable bracing arrangements.







2. Formwork Installation
Subsequently, proceed with formwork installation around the Tee to facilitate concrete casting. The proposed casting dimensions are 2.2 m × 2.2 m × 1.7 m. Ensure a 300 mm clearance is maintained below the pipe invert.







 3. Concrete Casting

Carry out concrete casting using C25 grade concrete as specified.







                                        
4. Precast Wall
  Construct precast wall panels using C25 grade concrete in accordance with the approved specifications.




              
5. Air Valve Installation
   Install the air valve in accordance with the approved drawings and specifications, ensuring proper alignment, secure connections, and leak-free operation.                                         












                                                        
6. Precast Wall
Position and set the precast wall panels in their designated locations, ensuring correct alignment, level, and structural stability in accordance with the approved design and specifications.



                                                    
7. Manhole Cover
Install the manhole cover in its designated position, ensuring proper seating, level alignment with the surrounding surface, and secure fitting in accordance with the approved specifications.
















                                      
8. Air Valve Chamber
Complete construction of the air valve chamber and ensure all works are finished in accordance with the approved drawings and specifications, including proper finishing, structural integrity, and readiness for operational use.

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