Tunnel excavation auxiliary method "Slit Injection Forepoling"

Reduce surface spalling caused by construction from within the cross-section! Achieve reliable injection through leak suppression.

The "Slit Injection Forepolling" is a tunnel excavation auxiliary method that allows for the insertion of cuttable bolts at a low angle from beneath the support structure into areas of concern for rockfall, such as unconsolidated ground. By performing construction from within the cross-section, it reduces the skin fall that occurs from the top and achieves reliable injection through leak suppression. It excels in ground improvement effects. 【Features】 ■ By processing slits in the bolts, it allows for the removal of the bolt ends. ■ It enables insertion from beneath the support structure, proving particularly effective in unconsolidated ground such as sandy hills, demonstrating higher effectiveness than conventional methods. ■ Since it is cast from beneath the support structure, it suppresses leaks caused by rough holes due to casting from the sprayed concrete application position, allowing for reliable injection. *For more details, please refer to the PDF document or feel free to contact us.

others