Slipforms for hydropower projects
HCC opted for slipforms for the concreting of a 115-m-deep surge shaft for the Punatsangchhu hydropower project Stage I, a 1,200-mw, run-of-the-river project in Western Bhutan.
POWER & RENEWABLE ENERGY

Slipforms for hydropower projects

HCC opted for slipforms for the concreting of a 115-m-deep surge shaft for the Punatsangchhu hydropower project Stage I, a 1,200-mw, run-of-the-river project in Western Bhutan.

“We opted for slip-forming because it enables continuous, non-interrupted, cast-in-place jointless concrete structures that have superior performance characteristics compared to piece-wise construction using discrete form elements,” says S D Jeur, Senior Vice-President, Projects, HCC.

Slipforms with a three-layered platform structure were used. The entire formwork structure was built in-house. The top platform was used to erect the reinforcement concrete, the middle platform was used for general movement, and the bottom one was used to provide the finishing to the concrete surface.

Slipforms have to be in a continuous motion so that the concrete does not stick to them. The speed of this formwork depends on several factors like the weather condition, the amount of concrete poured at a time and the size of the structure. As the slipform can move (slipping rate, usually between 5 and 30 cm/hour) whenever the concrete can carry the load of its weight in the lowest parts of form sheet, the likely concrete setting time was determined based on the weather conditions (temperature, humidity, etc), cement ratio, type of cement, slump and admixtures.

Usually, the slipform structure rises up with the daily progress of 0.75 m/day in standard conditions. However, at Punatsangchhu-I HEP, the daily progress harnessed from slipform was at an average of 1 m/day. The concrete lining thickness varied from 850 mm at the top, 1,200 mm in the middle and 1,500 mm at the bottom. Concrete was poured into the forms in layers of about 200 mm.

CHARU BAHRI

HCC opted for slipforms for the concreting of a 115-m-deep surge shaft for the Punatsangchhu hydropower project Stage I, a 1,200-mw, run-of-the-river project in Western Bhutan. “We opted for slip-forming because it enables continuous, non-interrupted, cast-in-place jointless concrete structures that have superior performance characteristics compared to piece-wise construction using discrete form elements,” says S D Jeur, Senior Vice-President, Projects, HCC. Slipforms with a three-layered platform structure were used. The entire formwork structure was built in-house. The top platform was used to erect the reinforcement concrete, the middle platform was used for general movement, and the bottom one was used to provide the finishing to the concrete surface. Slipforms have to be in a continuous motion so that the concrete does not stick to them. The speed of this formwork depends on several factors like the weather condition, the amount of concrete poured at a time and the size of the structure. As the slipform can move (slipping rate, usually between 5 and 30 cm/hour) whenever the concrete can carry the load of its weight in the lowest parts of form sheet, the likely concrete setting time was determined based on the weather conditions (temperature, humidity, etc), cement ratio, type of cement, slump and admixtures. Usually, the slipform structure rises up with the daily progress of 0.75 m/day in standard conditions. However, at Punatsangchhu-I HEP, the daily progress harnessed from slipform was at an average of 1 m/day. The concrete lining thickness varied from 850 mm at the top, 1,200 mm in the middle and 1,500 mm at the bottom. Concrete was poured into the forms in layers of about 200 mm. CHARU BAHRI

Next Story
Infrastructure Energy

Adani Energy Acquires Essar's Transmission Assets

Adani Energy has finalised the acquisition of Essar's Mahan and Sipat transmission assets for a sum of Rs 1900 crore. This significant move underscores Adani's strategic expansion within the energy sector and consolidates its position as a key player in India's power transmission domain.

The acquisition of Essar's transmission assets represents a strategic investment for Adani Energy, enabling the company to augment its infrastructure and bolster its transmission network. With the addition of these assets, Adani strengthens its operational footprint, enhancing its capacity to deliver r..

Next Story
Infrastructure Energy

IEX Q4 Net Profit Grows 9.5%

The Indian Energy Exchange (IEX) has reported a significant uptick in its net profit for the fourth quarter, marking a notable growth of 9.5%. This financial performance underscores the resilience and strength of the company's business model in navigating through dynamic market conditions within the energy sector.

The impressive growth in net profit reflects IEX's robust operational performance and effective strategic initiatives aimed at enhancing efficiency and driving sustainable value creation. As a leading power trading platform in India, IEX plays a pivotal role in facilitating t..

Next Story
Infrastructure Energy

Power Finance Corporation's Q4 Net Profit Rises 23% to Rs 75.56 Bn

Power Finance Corporation (PFC) has reported a substantial increase in its net profit for the fourth quarter, registering a 23% rise to Rs 75.56 billion. This impressive growth underscores the company's strong financial performance and strategic focus on the power sector.

The significant boost in net profit for Q4 can be attributed to PFC's robust operational efficiency, effective management practices, and a favourable business environment. The company's strategic initiatives aimed at optimising operations and enhancing revenue streams have played a crucial role in achieving this growth..

Hi There!

Now get regular updates from CW Magazine on WhatsApp!

Click on link below, message us with a simple hi, and SAVE our number

You will have subscribed to our Construction News on Whatsapp! Enjoy

+91 81086 03000

Join us Telegram