| Refurbishment
followed by reinforcement cages of up to 15t per panel. Highly fluid (high slump flowable) concrete was used as the filling material. One particular challenge during this project was the
excavation of the existing hard soil and rock layers. The geology encountered was very heterogeneous and the strength of rock, particularly the limestone and sandstone, was high with values up to 45 MPa. To enable the excavation of the panels with rope grabs, pre-drilling was carried out in some cases. This made it possible to relax the strength of the rock and minimise wear and tear on the grabs as far as possible. The work executed by BAUER was successfully completed in March 2023.”
Indian insight BAUER Engineering in India was also tasked by Indian
company Jaiprakash Associates Limited with the construction of a cut-off wall, as part of the 900MW project Arun III HEP on the Arun River in Nepal. The goal was to achieve a seal and reduce seepage water below the upstream cofferdam and in the left and right abutments. The scope of service provided by BAUER included
the execution of 3500 running meters of drilling and injection work on the cofferdam. In the granular construction soil, composed of sand, gravel, rubble and boulders, the pore injections were executed by means of tube-à-manchette and annular grouting. “Using the pore injections, we were able to fill the
pores in the very loose soil with cement slurry and thereby reduce its permeability,” Project Manager Satish Kumar explained In addition to the pore injections, BAUER also carried
out rock grouting in order to fill gaps, fractures and cavities in the rock. The remote location in the Himalayas provided logistical challenges along with a tight schedule as snowmelt starts in March, causing the water level in the river to rise and making work more difficult. A KLEMM KR 909 was used for the drilling and injection work.
Right: BAUER has also worked on a dam remediation project in Jordan
www.waterpowermagazine.com | September 2024 | 21
Top and above: Arun III HEP on the Arun River in Nepal
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