Title:
SHEATH FOR PC STEEL
Document Type and Number:
WIPO Patent Application WO/2012/157133
Kind Code:
A1
Abstract:
The present invention stably transmits prestress of PC steel to a prestressed concrete structure while suppressing the occurrence of voids in a sheath for the PC steel by devising the shape of the sheath to be used when the concrete structure is constructed.
This sheath (1) for PC steel is provided with a helically corrugated pipe-shaped body (10). By making the volume of grout (4) fitted into an inner peripheral helical groove (13) of the pipe-shaped body (10) larger than the volume of a concrete structure (2) fitted into an outer peripheral helical groove (12) of the pipe-shaped body (10), the strength on the grout (4) side is intensively increased. Consequently, even when the occurrence of voids in the sheath (1) is suppressed by filling the grout (4) with low viscosity (good fluidity), the cured grout (4) is easily neither cracked nor broken, thereby making it possible to stably transmit prestress of PC steel (3) to the concrete structure (2).
Inventors:
KIKUMORI YASUHIRO (JP)
HIRAO SHOJI (JP)
FUJII AKIHIRO (JP)
IIDA NAOTAKA (JP)
MATSUSHITA FUMIKAZU (JP)
UEDA SHUHEI (JP)
NABA TSUNEHIRO (JP)
HIRAO SHOJI (JP)
FUJII AKIHIRO (JP)
IIDA NAOTAKA (JP)
MATSUSHITA FUMIKAZU (JP)
UEDA SHUHEI (JP)
NABA TSUNEHIRO (JP)
Application Number:
PCT/JP2011/072569
Publication Date:
November 22, 2012
Filing Date:
September 30, 2011
Export Citation:
Assignee:
TOTAKU IND (JP)
KIKUMORI YASUHIRO (JP)
HIRAO SHOJI (JP)
FUJII AKIHIRO (JP)
IIDA NAOTAKA (JP)
MATSUSHITA FUMIKAZU (JP)
UEDA SHUHEI (JP)
NABA TSUNEHIRO (JP)
KIKUMORI YASUHIRO (JP)
HIRAO SHOJI (JP)
FUJII AKIHIRO (JP)
IIDA NAOTAKA (JP)
MATSUSHITA FUMIKAZU (JP)
UEDA SHUHEI (JP)
NABA TSUNEHIRO (JP)
International Classes:
E04C5/10; E04G21/12
Foreign References:
| GB1256952A | 1971-12-15 | |||
| JPH09144210A | 1997-06-03 | |||
| GB867063A | 1961-05-03 |
Attorney, Agent or Firm:
NISHIMORI MASAHIRO (JP)
Masahiro Nishimori (JP)
Masahiro Nishimori (JP)
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Claims: