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Steel Tunnel Method (STM)

Steel Tunnel Method (STM)

Steel Tunnel Method (STM)

The Steel Tunnel Method (STM) is a construction method to install a bit smaller horseshoe-shaped steel tunnel into the old tunnel and build a tunnel welded and unified with the old one. This method achieves the improvement of water distribution functions or strength in obsolete water tunnels with no need in new land purchase or in the demolition of existing facilities.

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PIP (Pipe in Pipe) Process

PIP (Pipe in Pipe) Process

PIP (Pipe in Pipe) Process

This method involves the insertion of a new steel pipe – which has a diameter that is one increment smaller than that of the existing obsolete pipe – into and through the inside of the other said pipe. This method requires no excavation and can ensure earthquake resistance and a watertight structure through the use of welded joints. If the existing pipes are bending-rolled and longitudinally seam-welded in situ, it is possible to use a pipe having a diameter approximate to that of the other said pipe.

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INS (Insituform) Process

INS (Insituform) Process

INS (Insituform) Process

This method involves the formation of a strong resin pipe within the existing obsolete pipe by inverting or pulling-in. Using a manhole or a small pit, installation can be completed within a short time, and it can be applied not only to round shapes, but also egg, oval, horseshoe, square, or other shapes.
"INSITUFORM® is a trademark of Insituform Technologies, Inc."

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Circulating Water Piping

Circulating Water Piping

Circulating Water Piping

Nippon Steel & Sumikin Engineering Co., Ltd. (NSENGI) performs path design, manufacturing and construction of pipes for the supply and discharge of sea water (circulating water) used to condense steam discharged from various generator turbines, such as those used in nuclear power plants and thermal power plants.

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Aqueducts

Aqueducts

Aqueducts

Aqueducts must be designed not only to be economical and functional, but also to fit the surrounding scenery. Nippon Steel & Sumikin Engineering Co., Ltd. (NSENGI) has conducted study, design, and construction of a variety of models of aqueducts based on the wealth of experience we have developed over many years.

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Steel Tunnel Method (STM)

Steel Tunnel Method (STM)

PIP (Pipe in Pipe) Process

PIP (Pipe in Pipe) Process

INS (Insituform) Process

INS (Insituform) Process

Circulating Water Piping

Circulating Water Piping

Aqueducts

Aqueducts

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