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1. Kohima Bulk Water Transmission Project - SIPMIU, Kohima, Government of Nagaland has assigned the Detailed Project Report (DPR) preparation of ADB financed Bulk Water Supply Project for Kohima. IndSTT assistance is focussed developing an optimum solution of tunnelling works for transmitting bulk water from Dzukou River to Kohima city under a mountain range. The Japfu Range separates the river intake and the water stilling tank that needs to be crossed by pipeline of 500mm dia. The tunnel proposed, however, was of 4.1m dia as the identified technique was TBM initially. This anomaly was rectified by changing the technique to Horizontal Directional Drilling. This change also afforded the project owner in reducing the construction duration from 4 years to 18 months and related costs substantially. |
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2. Airport Runway Lighting projects for various Indian Airports - The TATA Power Company Ltd., Strategic Electronics Division, engaged Indian Society for Trenchless Technology (IndSTT) for developing the Working Methodology for Creation of Subsurface Cavities for Airport Runway Illumination system through trenchless technology. Subsurface housing for power supply cables, developed through conventional cut and cover duct installation process, as attempted earlier, had been leading to the damage of the surface of the runways. To avoid this damage and consequential apron repair costs, and mitigate the future risks, IndSTT proposed using Horizontal Boring technique with special state-of-art alterations to meet the Airport owners' requirements without inflicting much damage on the runway structure. |
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3. Standard Operating Procedure for Road Cutting Permission, PWD, New Delhi - Public Works Department, Delhi Government (PWD) engaged IndSTT for developing the Standard Operation Procedure for granting Road Cutting Permissions for Trenchless Projects on the roads under its maintenance. PWD had observed that after completion of works by Trenchless Technology, roads at many places settled / caved-in, resulting in damage to the road structure, due to improper execution and lack of supervision. Faults identified were application of unapproved techniques, application of faulty estimation systems, engagement of untrained or under-trained operators, faulty operational activities, and lack of adequate supervision and As-build documentation. IndSTT developed the standard operating procedure to address such faults through Standardized Trenchless operations. |
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4. Trivandrum Stormwater Drainage Project - Trivandrum city receives significant rainfall during monsoon season and the capacity of existing storm water drainage system has become inadequate now. In order to meet the storm water loading requirements and upgrade existing drainage system in the city, Kerala Sustainable Urban Development Project, sought support of IndSTT in technique selection, project parameter identification, work specifications, schedule, and pre-qualification and bidding condition development, and promoting the project to the trenchless service providers for their "Storm Drainage - Phase II, Improvements to Pazhavangadi Thodu and Thampanoor Area and Diversion Works". As per the requirements tender documents for 2500mm ID Microtunneling and Pipe Jacking were prepared. |
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5. Bandra Kurla Carshed Railway Crossing - Indian Railways is assisting Municipal Corporation of Greater Mumbai for the work of widening of existing nallah by providing 5 nos. of 1800mm dia RCC pipe by Microtunneling & Pipejacking under railway tracks at Kurla. Due to conflicting requirements of pipe invert levels, Indian Railways & MCGM needed technical advice. IndSTT provided the same and the solution proposed was Inverted Siphon.
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6. Ta-Prohm Temple, Angkor Wat, Stormwater Drainage Project - WAPCOS Ltd. under the commission of Archaeological Survey of India, appointed IndSTT to prepare the tender documents and execution plan of drainage system for Ta Prohm Temple Complex, Phase-1, Angkor Wat, Siem Reap, Cambodia by trenchless technology method. Project is aimed at relieving the temple complex of long bouts of water logging experienced during the rainy season due to absence or non- functioning of existing drainage system. Project challenges included the site inaccessibility, lack of manoeuvrable space, collapse of historic drainage system, growth of rubber plants and their roots clogging the subsurface region, and the client's requirement of protecting the entire environment. To overcome these challenges, IndSTT selected the Forward Reaming variant of Horizontal Directional Drilling technology and prepared the tender documents. |
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7. Trunk Sewer, BRT Corridor, Indore Project - Indore Development Authority had planned to lay of sewerage main trunk under BRTS, Indore. At many of the locations, planned conventional open-cut method was unable deliver due to several impediments like hard rock, illegal occupation by squatters, heavy & continuous traffic movement at road junctions, presence of existing underground utilities etc. IDA sought support of IndSTT in finding solutions for such impediments. After a detailed site analysis, IndSTT proposed Microtunneling & Pipe Jacking, HDD with several other trenchless methodologies for cavity creation and Plasma Rock Breaking for removal of hard rock patches. |
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8. Economic Feasibility of Subsea Pipeline Project - One of the major international oil company requisitioned services of IndSTT for counducting a desktop study for evaluating comparative economic impact of application of different trenchless technologies for subsea pipeline projects. IndSTT prepared the detailed feasibility report for installing proposed pipeline through Microtunneling & Pipe Jacking method from the designated place on shore to the required locations in offshore. In the study, option of HDD also was proposed and considered to the extent possible keeping in view of the limitation for adopting HDD for the higher diameter of the pipeline. The report covered the cost and time required for tunnelling in varied draughts & geotechnical conditions.
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9. Shrirangam Temple Drainage Project - Sri Ranganathaswamy Temple, Srirangam, Tiruchirappalli, Tamilnadu, is a major pilgrimage destination and one of the largest temple complexes in India. Temple and its surrounding have ancient open drainage system confined by seven majestic Rampart Walls. Foundations of temple rampart wall are getting corroded due to caustic action of effluent being drained. For wall protection, drain coverage has become a necessity as the wall cladding is experiencing successive collapsing. Chennai Municipal Administration and concerned Urban Local Bodies sought guidance of IndSTT for a trenchless solution to convert the open drains to underground sewerage system since conventional construction methods were not possible due to risks and dense urban agglomeration around the temple complex. Based on project requirements, IndSTT proposed 4 different trenchless methods to suit the specific site condition. |
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10. Dal Lake Sewer Project - IndSTT provided the contractual assistance for bidding of the work of Construction of Trunk Drain, Main Drain, Sub Mains, Pipe Jacking and Drainage Road Crossing along National Highway Bypass Srinagar being executed by J&K Economic Reconstruction Agency. The project was aimed toward reducing the pollution in Dal Lake. |
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11. Indrayani River Crossing, Chakan, Pune - Under the direction of Hon. High Court of Maharashtra, Pune Bench, IndSTT provided the dispute resolution assistance to M/s Taurant Project India Limited (TPIL) and M/s Mahanagar Natural Gas Limited for their trenchless project related disputes. After inspecting the project site, where HDD crossing of 10" NB gas pipeline and associated works for Indrayani River, Chakan, Pune, had been executed, and receiving the rejoinders from both the parties, IndSTT submitted its opinion to concerned arbitrator and the parties. |
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