Products made from rolled thin steel sheets. Used in various structures of prestressed concrete. Also available in polyethylene.
Spiral sheaths for prestressed concrete are lightweight rolled pipes made from strip steel with a width of 34 to 100 mm and a thickness of 0.23 to 1.0 mm, manufactured using our unique production method. They are used in various structures of prestressed concrete. The features of the spiral sheath include the ability to easily form stable curved shapes due to sufficient flexibility, possessing adequate necessary strength despite being thin and lightweight, having a high adhesion strength with concrete, and the ability to be produced in any desired length. Additionally, the selection of material and steel plate thickness can be customized according to the construction method and application used. For more details, please contact us or download the catalog.
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basic information
【Lineup】 ■ Steel Spiral Sheath Series ○ #1000 Standard Type → A standard sheath widely used as a sheath for prestressed concrete. ○ #2000 Special Pressure Type → A strengthened sheath used when inserting PC steel wires after concrete placement or when using a pushing machine to insert PC steel wires. ○ #3000 WS Type → A sheath with high flexibility and resistance to bending, which can be coiled. ○ #4000 Linear Type → A sheath with high linearity used for applications such as lateral tightening. ○ #5000 Stainless Steel Special Pressure Type → Used for applications that require particularly rust and corrosion resistance for the sheath. ○ #6000 Stainless Steel WS Type → Used for applications that require particularly rust and corrosion resistance for the sheath. ■ Polyethylene Spiral Sheath Series ○ #8000 → A polyethylene sheath for inner cables with many functions not found in conventional sheaths. ○ #9000 → Protects against salt damage caused by seawater and sea breeze in PC structures, or salt damage from the application of antifreeze in cold regions, preventing salt from penetrating into concrete and protecting against the failure and damage of PC steel materials.
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Applications/Examples of results
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Company information
In today's world, where it is said that "technology knows no borders," we quickly adopt excellent innovations from around the globe and continuously send our own technologies out into the world. This is JL's principle. In 1984, we formed a technical partnership with the British company Cretec and launched high-strength mortar spacers. Furthermore, in 1986, we signed a contract with the German company Frimeda for lifting anchors, in 1994 with the German company Halfen for cast-in channels, and with the Dutch company Deha for bar couplers, and we are actively selling these products. As overseas cooperative factories, we have foundries and fine ceramic products in South Korea, two joint ventures and one cooperative company in China, two wholly-owned companies in China, one wholly-owned company in South Korea, and a cooperative factory in Vietnam. We contribute broadly to the world, not only within Japan, from the manufacturing of construction materials, machine parts, shipbuilding components, and multi-story parking components, to surface treatments such as dacromet processing and zinc plating.