Abstract：According to the structure and geological feature of sewage pool and integrated analysis of various anti-floating methods，the type of the anti-floating anchor with blast-expanding bore and variable section are put forward. Those ways can solve the anti-floating problem and ensure the sewage pool can be put into production as soon as possible. Because of end effects of the anchorage and the expanding part at the bore end，not only the bond strength of anchor can be improved effectively，but also the depth and diameter of the bore are shortened，and the construction efficiency is significantly enhanced. The method of blast-expanding bore can squeeze soil rapidly around the anchor bore，expand the bore section，raise the bond strength between soil and grouting body，and increase the anchoring force of anchors. Practice has proved that，as a reinforcement method of engineering anti-float，its a cost-effective and efficient anti-floating method to combine anti-floating anchor and blast- expanding bore. This can provide reference to the similar projects in design and construction.
