Title:
SCREW HOLE FORMING METHOD AT TIME OF CASTING OF CONCRETE
Document Type and Number:
Japanese Patent JP2004249500
Kind Code:
A
Abstract:
To enhance work efficiency by simply pulling out a bolt only by a rotary tool such as a spanner to form a screw hole.
The screw hole 5 is formed using a bolt 1 at the time of casting of concrete and, as the bolt 1, a screw rod 10 wherein a helical angle is 9° or below and the cross sections of a screw groove 11 and a screw thread 12 are formed into an almost arc shape, is used. The bolt 1 is embedded in concrete 31 at the time of casting of concrete so that a part of the length thereof is left and pulled out while rotated after concrete 31 is cured to form the screw hole 5 opened in the surface of concrete 31.
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Inventors:
SAKAI SADAYOSHI
SAKAI JUNJI
SAKAI JUNJI
Application Number:
JP2003040156A
Publication Date:
September 09, 2004
Filing Date:
February 18, 2003
Export Citation:
Assignee:
ZEN GIKEN KK
SAKAI JUNJI
SAKAI JUNJI
International Classes:
E02D27/00; B28B7/16; B28B7/34; E04G9/10; (IPC1-7): B28B7/16; B28B7/34; E02D27/00; E04G9/10
Attorney, Agent or Firm:
Masamichi Ayata
Satoru Asakura
Satoru Asakura