If the bore diameter is changed using a packer or similar device, the circumferential frictional resistance will be greater than originally designed.

Since the circumference of φ115 is larger than that of φ90, friction increases.

Since increased friction means the anchor body will be overdesigned,

The fixing section needs to be shortened.

However, it will never be shorter than the minimum anchorage length of 3 meters.

Regarding design changes, such as increasing the bore diameter,

Design consultants or specialized contractors (Our Company) Please contact us.