2016年09月06日

Self drilling soil nail

The construction industry has developed self drilling soil nail systems (or pressure injected bored, IBO) that combine both drilling, placing and grouting in a single operation as a solution to speed up construction. While the soil nail system is extensively used for temporary applications, nevertheless, some concerns, particularly about corrosion, has limited the use of this technology as a permanent system in North America. This study presents several issues related to self drilling soil nail systems, the results of a field investigation and a summary of the research project.
Self drilling soil nail system manufactured by sinorock factory consisting of the drill bit attached to the hollow grouted bar, which is encased by the spreading column, is lowered into the hole. The spreading apparatus is attached and centered in contact with the surface.
It is used in applications with rock at the surface, without coring requirements, its installation is greatly simplified.
The soil nail system is rotated using the hole drilling power unit, opening the drill bit into the load bearing media, in a predetermined controlled manner. This places the drill bit conically into the rock, which effectively utilizes the maximum strength of the load bearing
rock via the Anchoring System. The spreading column is removed allowing the system to be immediately tested and placed into its designed use. If required, the system may be post-tensioned in order to meet current seismic loading safety measures.


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http://soilnailing.fukuokablog.jp/t10361
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