Using hollow PC steel rods! Introducing prestress to connect existing and new concrete.
The "NAPP Anchor Method" is a construction technique that involves placing NAPP units in drilled holes of existing concrete structures and introducing prestress to bond the existing concrete with new concrete. There are no gaps at the joint sections, and it offers excellent durability. Depending on the conditions, the new section can also be made of precast blocks. 【Features】 - Reliable introduction of prestress - Labor-saving and reduction of construction time - Fewer drilled holes compared to rebar - Surface treatment of joint sections can be done with minimal cleaning, resulting in almost no noise *For more details, please refer to the PDF materials or feel free to contact us.
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basic information
【Performance and Testing】 ■ Mortar Filling Confirmation Test ■ Fixation Performance Confirmation Test ■ Prestress Introduction Confirmation Test *For more details, please refer to the PDF document or feel free to contact us.
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Applications/Examples of results
【Achievements】 ■ Construction of the new bridge prevention work for the Hatsuzawa Overpass and others ■ Improvement work for traffic safety facilities on National Route 204 (Imabukubashi) ■ Fiscal Year 2009 Regional Revitalization and Detailed Grant Project Nojiri No. 2 Bridge ■ Construction of the upper structure of the Kaike Bridge on the municipal road Yumenji Temple No. 1 Line ■ Disaster recovery work for sedimentation ponds (displacement prevention device) *For more details, please refer to the PDF document or feel free to contact us.
Detailed information
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Mortar filling confirmation test Reliable mortar filling has been confirmed.
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Pre-stress introduction confirmation test It has been confirmed that pre-stress can be reliably introduced at the joint.
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Adhesion performance confirmation test It has been confirmed that there is adhesion performance without displacement occurring under standard tension load and threaded section tensile load.
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Company information
Oriental Shiraishi Co., Ltd. is a company primarily engaged in the construction and manufacturing sales of prestressed concrete, as well as the construction of pneumatic caissons and repair and reinforcement construction. We contribute to the development of social infrastructure by utilizing special technologies in a setting that looks towards the great nature, the earth, and the future of cities.
