GROUND IMPROVEMENT BY ARTIFICIAL GROUND FREEZING FOR TBM TUNNEL DEFORMATION AND INRUSH CONTROL
GROUND IMPROVEMENT BY ARTIFICIAL GROUND FREEZING FOR TBM TUNNEL DEFORMATION AND INRUSH CONTROL Application of Brine Circulation Ground Freezing for Emergency Stabilization of TBM Tunnels in Tropical Regions ― 1. Project Background During construction of a TBM tunnel in Thailand, settlement and displacement occurred at the connection between a shaft and the tunnel, resulting in
SITE IMPROVEMENT FOR EXCAVATION OF UNDERGROUND PASSAGEWAY IN LATERITE GRAVEL LAYER
SITE IMPROVEMENT FOR EXCAVATION OF UNDERGROUND PASSAGEWAY IN LATERITE GRAVEL LAYER Double-packer horizontal grouting technology ― 1. Project Background A new underground passage was planned to be constructed between an MRT station and an adjacent high-speed rail station to facilitate passenger transfers. The newly completed MRT tracks were elevated, while the operational high-speed rail ran
COFFERDAM PREVENTATIVE AND EMERGENCY WATER-STOP GROUTING
COFFERDAM PREVENTATIVE AND EMERGENCY WATER-STOP GROUTING Water-stop grouting for preventative & emergency waterproofing in retaining pile joints during excavation ― 1. Project Background The main bridge tower of a cross-river bridge had adopted steel pipe piles as the retaining structure. In order to prevent groundwater from inrush during excavation, management planned to conduct Double-Packer grouting
HYDROELECTRIC DAM RESTORATION AFTER STRONG EARTHQUAKE
HYDROELECTRIC DAM RESTORATION AFTER STRONG EARTHQUAKE Emergency leak-stop and reinforcement of concrete dam structure after earthquake ― 1. Project Background After a severe earthquake in 1999, a power plant dam experienced multiple shear cracks and uplift joints in its concrete structure, leading to water seepage. To prevent the dam from collapsing and causing risks to
BACKFILL GROUTING BETWEEN OLD TUNNEL INVERTS AND ROCK MASS
BACKFILL GROUTING BETWEEN OLD TUNNEL INVERTS AND ROCK MASS Filling and reinforcement of voids behind tunnel lining ― 1. Project Background To accommodate the electrification of the Taiwan Round-Island Railway, comprehensive safety inspections and maintenance were required for sections of old tunnels before their final opening to traffic. These tunnels had been in use for
DIAPHRAGM WALL GUIDE TRENCH COLLAPSE GROUND IMPROVEMENT
DIAPHRAGM WALL GUIDE TRENCH COLLAPSE GROUND IMPROVEMENT Strata filling, reinforcement, water stopping composite grouting ― 1. Project Background A collapse occurred during the excavation of a diaphragm wall guide trench at GL.-29m. Due to the presence of an underground culvert nearby, the construction unit immediately backfilled the guide trench to GL.-3m below the lower edge
SEALING OF SECONDARY CONSTRUCTION JOINTS WATER SEEPAGE ON IN-USE ELEVATED ROAD PIERS
SEALING OF SECONDARY CONSTRUCTION JOINTS WATER SEEPAGE ON IN-USE ELEVATED ROAD PIERS Grouting technology for sealing water leakage in open-type drainage system fittings within concrete ― 1. Project Background After a period of use, the PVC pipe interface of the drainage system inside the concrete pier of an elevated road began to leak. During the
URBAN DISTRICT SANITARY SEWER PIPE DAMAGE REPAIR CASE STUDY
URBAN DISTRICT SANITARY SEWER PIPE DAMAGE REPAIR CASE STUDY Quick & effective repair method for underground sanitary pipe damaged during full-casing pipe pile construction ― 1. Project Background During the implementation of full-casing piles construction in an urban district project, a large-diameter steel casing accidentally cut into a buried in-use sanitary sewer main during excavation.
HANDLING OF DAMAGED UNDERGROUND TUNNELS
HANDLING OF DAMAGED UNDERGROUND TUNNELS Techniques for structural repair and leak prevention in underground conduits ― 1. Project Background After a period of usage, a functioning underground tunnel and its connecting access routes had experienced various issues due to factors such as natural disasters, changes in geological conditions, and aging. These issues included surface lining
Water Inrush Control At The Interface Between Offshore Bridge Foundation Piles And Pier Steel Box Cofferdam
WATER INRUSH CONTROL AT THE INTERFACE BETWEEN OFFSHORE BRIDGE FOUNDATION PILES AND PIER STEEL BOX COFFERDAM Water pressure balanced resin grouting water-stop reinforcement ― 1. Project Background Some piers of a cross-sea bridge were designed with pier steel box cofferdam foundations. However, due to the prior construction of the offshore steel pipe piles, when the