| 摘要 |
PURPOSE:To enable the ambient frictional force of a pile to be easily measured, by measuring a pull-out resistance force when a test piece driven into foundation to a specified degree in order to examine the characteristic of the foundation is pulled out of the foundation. CONSTITUTION:A boring tool 5A with a bit 5a is fitted at the tip of a rod 5, and a boring pit H is bored through foundation G and after that the rod 5 is lifted up, and in place of the boring tool 5A, a sampler 5B is fitted, and a hammer 2 is lifted up and is dripped freely down to knocking head 7 to be repeatedly driven. Then sampler 5B is penetrated into the foundation G, and after the counting of an N value is completed, a pull-out resistance force is measured by a load cell 9 when the penetrated section of the sampler 5B is pulled out by a pull-out wire 8, and from the pull-out resistance force, the ambient frictional force of a pile is found. As a result, with an economical means, the practical ambient frictional force of the pile can be found.
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