For the maintenance and management of existing PC structures! It eliminates the effects of drying shrinkage and creep strain.
The "Residual Prestress Estimation Method by Core Cutting" is a construction method that eliminates the effects of drying shrinkage and creep strain, achieving a more accurate estimation of "residual prestress." By utilizing the difference between the release strain in the direction of prestress and the release strain in the perpendicular direction, the majority of the strain components caused by internal restraint are eliminated, and for the components that cannot be eliminated, they are removed using our company's devised calculation formula. 【Features】 ■ Measures strain in two directions and calculates using our devised formula ■ Patent No. 5095258 ■ The machine height for core drilling is approximately 70 cm ■ Core diameter φ50 ■ Cutting depth is only 18 mm *For more details, please refer to the PDF document or feel free to contact us.
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basic information
【Other Features】 ■ Simple construction method ■ Excellent cost-effectiveness ■ Equipment consists only of core drilling machine and static strain gauge ■ Method based on stress release ■ Outstanding precision *For more details, please refer to the PDF document or feel free to contact us.
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Applications/Examples of results
【Uses】 ■ PCT girder bridges over national highways ■ Removal girders from expressways ■ Pier bridges *For more details, please refer to the PDF document or feel free to contact us.
Detailed information
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Example of internal restraint in steel materials
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Groove cutting
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Lead wire connection
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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.