| 摘要 |
PROBLEM TO BE SOLVED: To provide a grouting method into a prestressed concrete tendon insertion sheath in a prestressed concrete structure that can easily and accurately eliminate air stagnation without requiring highly accurate work with many man-hours before grouting. SOLUTION: In constructing a post-tension type prestressed concrete structure 10, grout (a) is filled by a grout force-feed pump 23 from one end side in the prestressed concrete insertion sheath 11 installed in the structure after tensioning a prestressed concrete tendon inserted in the prestressed concrete tendon insertion sheath 11. In this grouting method, a branch passage 12 is previously provided upward in an air stagnation occurrence anticipated position in the prestressed concrete tendon insertion sheath 10, and after the filled tip of grout (a) passes through the branch passage 12, a decompression container 30 is put in communication with the branch passage 12 to reduce pressure in the branch passage 12, thus exhausting air in the air stagnation (b). COPYRIGHT: (C)2009,JPO&INPIT
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